]>
Commit | Line | Data |
---|---|---|
aa1f3bb5 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * USB hub driver. | |
4 | * | |
5 | * (C) Copyright 1999 Linus Torvalds | |
6 | * (C) Copyright 1999 Johannes Erdfelt | |
7 | * (C) Copyright 1999 Gregory P. Smith | |
8 | * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) | |
9 | * | |
b65fba3d | 10 | * Released under the GPLv2 only. |
1da177e4 LT |
11 | */ |
12 | ||
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/errno.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/moduleparam.h> | |
17 | #include <linux/completion.h> | |
5b3cc15a | 18 | #include <linux/sched/mm.h> |
1da177e4 LT |
19 | #include <linux/list.h> |
20 | #include <linux/slab.h> | |
1da177e4 LT |
21 | #include <linux/ioctl.h> |
22 | #include <linux/usb.h> | |
23 | #include <linux/usbdevice_fs.h> | |
27729aad | 24 | #include <linux/usb/hcd.h> |
925aa46b | 25 | #include <linux/usb/otg.h> |
93362a87 | 26 | #include <linux/usb/quirks.h> |
32a69589 | 27 | #include <linux/workqueue.h> |
4186ecf8 | 28 | #include <linux/mutex.h> |
b04b3156 | 29 | #include <linux/random.h> |
ad493e5e | 30 | #include <linux/pm_qos.h> |
1da177e4 | 31 | |
7c0f6ba6 | 32 | #include <linux/uaccess.h> |
1da177e4 LT |
33 | #include <asm/byteorder.h> |
34 | ||
6e30d7cb | 35 | #include "hub.h" |
026f3fcb | 36 | #include "otg_whitelist.h" |
1da177e4 | 37 | |
e6f30dea ML |
38 | #define USB_VENDOR_GENESYS_LOGIC 0x05e3 |
39 | #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 | |
40 | ||
fa286188 | 41 | /* Protect struct usb_device->state and ->children members |
9ad3d6cc | 42 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
43 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
44 | static DEFINE_SPINLOCK(device_state_lock); | |
45 | ||
32a69589 PM |
46 | /* workqueue to process hub events */ |
47 | static struct workqueue_struct *hub_wq; | |
48 | static void hub_event(struct work_struct *work); | |
1da177e4 | 49 | |
d8521afe DW |
50 | /* synchronize hub-port add/remove and peering operations */ |
51 | DEFINE_MUTEX(usb_port_peer_mutex); | |
52 | ||
1da177e4 | 53 | /* cycle leds on hubs that aren't blinking for attention */ |
a44007a4 | 54 | static bool blinkenlights; |
166b8639 CM |
55 | module_param(blinkenlights, bool, S_IRUGO); |
56 | MODULE_PARM_DESC(blinkenlights, "true to cycle leds on hubs"); | |
1da177e4 | 57 | |
fd7c519d JK |
58 | /* |
59 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about | |
60 | * 10 seconds to send reply for the initial 64-byte descriptor request. | |
61 | */ | |
62 | /* define initial 64-byte descriptor request timeout in milliseconds */ | |
63 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; | |
64 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); | |
b9cef6c3 WF |
65 | MODULE_PARM_DESC(initial_descriptor_timeout, |
66 | "initial 64-byte descriptor request timeout in milliseconds " | |
67 | "(default 5000 - 5.0 seconds)"); | |
fd7c519d | 68 | |
1da177e4 LT |
69 | /* |
70 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
71 | * closely resembles the way Windows works. Hopefully it will be compatible | |
72 | * with a wider range of devices than the old scheme. However some previously | |
73 | * working devices may start giving rise to "device not accepting address" | |
74 | * errors; if that happens the user can try the old scheme by adjusting the | |
75 | * following module parameters. | |
76 | * | |
77 | * For maximum flexibility there are two boolean parameters to control the | |
78 | * hub driver's behavior. On the first initialization attempt, if the | |
79 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
80 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
81 | * is set, then the driver will make another attempt, using the other scheme. | |
82 | */ | |
a44007a4 | 83 | static bool old_scheme_first; |
1da177e4 LT |
84 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); |
85 | MODULE_PARM_DESC(old_scheme_first, | |
86 | "start with the old device initialization scheme"); | |
87 | ||
90ab5ee9 | 88 | static bool use_both_schemes = 1; |
1da177e4 LT |
89 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); |
90 | MODULE_PARM_DESC(use_both_schemes, | |
91 | "try the other device initialization scheme if the " | |
92 | "first one fails"); | |
93 | ||
32fe0198 AS |
94 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
95 | * port reset on some companion controllers. | |
96 | */ | |
97 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); | |
98 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); | |
99 | ||
ad493e5e | 100 | #define HUB_DEBOUNCE_TIMEOUT 2000 |
948fea37 AS |
101 | #define HUB_DEBOUNCE_STEP 25 |
102 | #define HUB_DEBOUNCE_STABLE 100 | |
103 | ||
32a69589 | 104 | static void hub_release(struct kref *kref); |
742120c6 | 105 | static int usb_reset_and_verify_device(struct usb_device *udev); |
3bc02bce | 106 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state); |
742120c6 | 107 | |
131dec34 | 108 | static inline char *portspeed(struct usb_hub *hub, int portstatus) |
1da177e4 | 109 | { |
d64aab0c ON |
110 | if (hub_is_superspeedplus(hub->hdev)) |
111 | return "10.0 Gb/s"; | |
131dec34 SS |
112 | if (hub_is_superspeed(hub->hdev)) |
113 | return "5.0 Gb/s"; | |
288ead45 | 114 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
469271f8 | 115 | return "480 Mb/s"; |
288ead45 | 116 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
1da177e4 LT |
117 | return "1.5 Mb/s"; |
118 | else | |
119 | return "12 Mb/s"; | |
120 | } | |
1da177e4 LT |
121 | |
122 | /* Note that hdev or one of its children must be locked! */ | |
ad493e5e | 123 | struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) |
1da177e4 | 124 | { |
ff823c79 | 125 | if (!hdev || !hdev->actconfig || !hdev->maxchild) |
25118084 | 126 | return NULL; |
1da177e4 LT |
127 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
128 | } | |
129 | ||
2d2a3167 | 130 | int usb_device_supports_lpm(struct usb_device *udev) |
d9b2099c | 131 | { |
ad87e032 AS |
132 | /* Some devices have trouble with LPM */ |
133 | if (udev->quirks & USB_QUIRK_NO_LPM) | |
134 | return 0; | |
135 | ||
d9b2099c SS |
136 | /* USB 2.1 (and greater) devices indicate LPM support through |
137 | * their USB 2.0 Extended Capabilities BOS descriptor. | |
138 | */ | |
a8425292 | 139 | if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) { |
d9b2099c SS |
140 | if (udev->bos->ext_cap && |
141 | (USB_LPM_SUPPORT & | |
142 | le32_to_cpu(udev->bos->ext_cap->bmAttributes))) | |
143 | return 1; | |
144 | return 0; | |
145 | } | |
51e0a012 | 146 | |
25cd2882 SS |
147 | /* |
148 | * According to the USB 3.0 spec, all USB 3.0 devices must support LPM. | |
149 | * However, there are some that don't, and they set the U1/U2 exit | |
150 | * latencies to zero. | |
51e0a012 SS |
151 | */ |
152 | if (!udev->bos->ss_cap) { | |
25cd2882 | 153 | dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); |
51e0a012 SS |
154 | return 0; |
155 | } | |
51e0a012 | 156 | |
25cd2882 SS |
157 | if (udev->bos->ss_cap->bU1devExitLat == 0 && |
158 | udev->bos->ss_cap->bU2DevExitLat == 0) { | |
159 | if (udev->parent) | |
160 | dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); | |
161 | else | |
162 | dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); | |
51e0a012 SS |
163 | return 0; |
164 | } | |
51e0a012 | 165 | |
25cd2882 SS |
166 | if (!udev->parent || udev->parent->lpm_capable) |
167 | return 1; | |
d9b2099c SS |
168 | return 0; |
169 | } | |
170 | ||
51e0a012 SS |
171 | /* |
172 | * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from | |
173 | * either U1 or U2. | |
174 | */ | |
175 | static void usb_set_lpm_mel(struct usb_device *udev, | |
176 | struct usb3_lpm_parameters *udev_lpm_params, | |
177 | unsigned int udev_exit_latency, | |
178 | struct usb_hub *hub, | |
179 | struct usb3_lpm_parameters *hub_lpm_params, | |
180 | unsigned int hub_exit_latency) | |
181 | { | |
182 | unsigned int total_mel; | |
183 | unsigned int device_mel; | |
184 | unsigned int hub_mel; | |
185 | ||
186 | /* | |
187 | * Calculate the time it takes to transition all links from the roothub | |
188 | * to the parent hub into U0. The parent hub must then decode the | |
189 | * packet (hub header decode latency) to figure out which port it was | |
190 | * bound for. | |
191 | * | |
192 | * The Hub Header decode latency is expressed in 0.1us intervals (0x1 | |
193 | * means 0.1us). Multiply that by 100 to get nanoseconds. | |
194 | */ | |
195 | total_mel = hub_lpm_params->mel + | |
196 | (hub->descriptor->u.ss.bHubHdrDecLat * 100); | |
197 | ||
198 | /* | |
199 | * How long will it take to transition the downstream hub's port into | |
200 | * U0? The greater of either the hub exit latency or the device exit | |
201 | * latency. | |
202 | * | |
203 | * The BOS U1/U2 exit latencies are expressed in 1us intervals. | |
204 | * Multiply that by 1000 to get nanoseconds. | |
205 | */ | |
206 | device_mel = udev_exit_latency * 1000; | |
207 | hub_mel = hub_exit_latency * 1000; | |
208 | if (device_mel > hub_mel) | |
209 | total_mel += device_mel; | |
210 | else | |
211 | total_mel += hub_mel; | |
212 | ||
213 | udev_lpm_params->mel = total_mel; | |
214 | } | |
215 | ||
216 | /* | |
217 | * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate | |
218 | * a transition from either U1 or U2. | |
219 | */ | |
220 | static void usb_set_lpm_pel(struct usb_device *udev, | |
221 | struct usb3_lpm_parameters *udev_lpm_params, | |
222 | unsigned int udev_exit_latency, | |
223 | struct usb_hub *hub, | |
224 | struct usb3_lpm_parameters *hub_lpm_params, | |
225 | unsigned int hub_exit_latency, | |
226 | unsigned int port_to_port_exit_latency) | |
227 | { | |
228 | unsigned int first_link_pel; | |
229 | unsigned int hub_pel; | |
230 | ||
231 | /* | |
232 | * First, the device sends an LFPS to transition the link between the | |
233 | * device and the parent hub into U0. The exit latency is the bigger of | |
234 | * the device exit latency or the hub exit latency. | |
235 | */ | |
236 | if (udev_exit_latency > hub_exit_latency) | |
237 | first_link_pel = udev_exit_latency * 1000; | |
238 | else | |
239 | first_link_pel = hub_exit_latency * 1000; | |
240 | ||
241 | /* | |
242 | * When the hub starts to receive the LFPS, there is a slight delay for | |
243 | * it to figure out that one of the ports is sending an LFPS. Then it | |
244 | * will forward the LFPS to its upstream link. The exit latency is the | |
245 | * delay, plus the PEL that we calculated for this hub. | |
246 | */ | |
247 | hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; | |
248 | ||
249 | /* | |
250 | * According to figure C-7 in the USB 3.0 spec, the PEL for this device | |
251 | * is the greater of the two exit latencies. | |
252 | */ | |
253 | if (first_link_pel > hub_pel) | |
254 | udev_lpm_params->pel = first_link_pel; | |
255 | else | |
256 | udev_lpm_params->pel = hub_pel; | |
257 | } | |
258 | ||
259 | /* | |
260 | * Set the System Exit Latency (SEL) to indicate the total worst-case time from | |
261 | * when a device initiates a transition to U0, until when it will receive the | |
262 | * first packet from the host controller. | |
263 | * | |
264 | * Section C.1.5.1 describes the four components to this: | |
265 | * - t1: device PEL | |
266 | * - t2: time for the ERDY to make it from the device to the host. | |
267 | * - t3: a host-specific delay to process the ERDY. | |
268 | * - t4: time for the packet to make it from the host to the device. | |
269 | * | |
270 | * t3 is specific to both the xHCI host and the platform the host is integrated | |
271 | * into. The Intel HW folks have said it's negligible, FIXME if a different | |
272 | * vendor says otherwise. | |
273 | */ | |
274 | static void usb_set_lpm_sel(struct usb_device *udev, | |
275 | struct usb3_lpm_parameters *udev_lpm_params) | |
276 | { | |
277 | struct usb_device *parent; | |
278 | unsigned int num_hubs; | |
279 | unsigned int total_sel; | |
280 | ||
281 | /* t1 = device PEL */ | |
282 | total_sel = udev_lpm_params->pel; | |
283 | /* How many external hubs are in between the device & the root port. */ | |
284 | for (parent = udev->parent, num_hubs = 0; parent->parent; | |
285 | parent = parent->parent) | |
286 | num_hubs++; | |
287 | /* t2 = 2.1us + 250ns * (num_hubs - 1) */ | |
288 | if (num_hubs > 0) | |
289 | total_sel += 2100 + 250 * (num_hubs - 1); | |
290 | ||
291 | /* t4 = 250ns * num_hubs */ | |
292 | total_sel += 250 * num_hubs; | |
293 | ||
294 | udev_lpm_params->sel = total_sel; | |
295 | } | |
296 | ||
297 | static void usb_set_lpm_parameters(struct usb_device *udev) | |
298 | { | |
299 | struct usb_hub *hub; | |
300 | unsigned int port_to_port_delay; | |
301 | unsigned int udev_u1_del; | |
302 | unsigned int udev_u2_del; | |
303 | unsigned int hub_u1_del; | |
304 | unsigned int hub_u2_del; | |
305 | ||
8a1b2725 | 306 | if (!udev->lpm_capable || udev->speed < USB_SPEED_SUPER) |
51e0a012 SS |
307 | return; |
308 | ||
ad493e5e | 309 | hub = usb_hub_to_struct_hub(udev->parent); |
51e0a012 SS |
310 | /* It doesn't take time to transition the roothub into U0, since it |
311 | * doesn't have an upstream link. | |
312 | */ | |
313 | if (!hub) | |
314 | return; | |
315 | ||
316 | udev_u1_del = udev->bos->ss_cap->bU1devExitLat; | |
4d967995 | 317 | udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); |
51e0a012 | 318 | hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; |
4d967995 | 319 | hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); |
51e0a012 SS |
320 | |
321 | usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, | |
322 | hub, &udev->parent->u1_params, hub_u1_del); | |
323 | ||
324 | usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, | |
325 | hub, &udev->parent->u2_params, hub_u2_del); | |
326 | ||
327 | /* | |
328 | * Appendix C, section C.2.2.2, says that there is a slight delay from | |
329 | * when the parent hub notices the downstream port is trying to | |
330 | * transition to U0 to when the hub initiates a U0 transition on its | |
331 | * upstream port. The section says the delays are tPort2PortU1EL and | |
332 | * tPort2PortU2EL, but it doesn't define what they are. | |
333 | * | |
334 | * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking | |
335 | * about the same delays. Use the maximum delay calculations from those | |
336 | * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For | |
337 | * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I | |
338 | * assume the device exit latencies they are talking about are the hub | |
339 | * exit latencies. | |
340 | * | |
341 | * What do we do if the U2 exit latency is less than the U1 exit | |
342 | * latency? It's possible, although not likely... | |
343 | */ | |
344 | port_to_port_delay = 1; | |
345 | ||
346 | usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, | |
347 | hub, &udev->parent->u1_params, hub_u1_del, | |
348 | port_to_port_delay); | |
349 | ||
350 | if (hub_u2_del > hub_u1_del) | |
351 | port_to_port_delay = 1 + hub_u2_del - hub_u1_del; | |
352 | else | |
353 | port_to_port_delay = 1 + hub_u1_del; | |
354 | ||
355 | usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, | |
356 | hub, &udev->parent->u2_params, hub_u2_del, | |
357 | port_to_port_delay); | |
358 | ||
359 | /* Now that we've got PEL, calculate SEL. */ | |
360 | usb_set_lpm_sel(udev, &udev->u1_params); | |
361 | usb_set_lpm_sel(udev, &udev->u2_params); | |
362 | } | |
363 | ||
1da177e4 | 364 | /* USB 2.0 spec Section 11.24.4.5 */ |
bec444cd JH |
365 | static int get_hub_descriptor(struct usb_device *hdev, |
366 | struct usb_hub_descriptor *desc) | |
1da177e4 | 367 | { |
dbe79bbe JY |
368 | int i, ret, size; |
369 | unsigned dtype; | |
370 | ||
371 | if (hub_is_superspeed(hdev)) { | |
372 | dtype = USB_DT_SS_HUB; | |
373 | size = USB_DT_SS_HUB_SIZE; | |
374 | } else { | |
375 | dtype = USB_DT_HUB; | |
376 | size = sizeof(struct usb_hub_descriptor); | |
377 | } | |
1da177e4 LT |
378 | |
379 | for (i = 0; i < 3; i++) { | |
380 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
381 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
bec444cd | 382 | dtype << 8, 0, desc, size, |
1da177e4 | 383 | USB_CTRL_GET_TIMEOUT); |
2c25a2c8 JH |
384 | if (hub_is_superspeed(hdev)) { |
385 | if (ret == size) | |
386 | return ret; | |
bec444cd JH |
387 | } else if (ret >= USB_DT_HUB_NONVAR_SIZE + 2) { |
388 | /* Make sure we have the DeviceRemovable field. */ | |
389 | size = USB_DT_HUB_NONVAR_SIZE + desc->bNbrPorts / 8 + 1; | |
390 | if (ret < size) | |
391 | return -EMSGSIZE; | |
1da177e4 | 392 | return ret; |
2c25a2c8 | 393 | } |
1da177e4 LT |
394 | } |
395 | return -EINVAL; | |
396 | } | |
397 | ||
398 | /* | |
399 | * USB 2.0 spec Section 11.24.2.1 | |
400 | */ | |
401 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
402 | { | |
403 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
404 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
405 | } | |
406 | ||
407 | /* | |
408 | * USB 2.0 spec Section 11.24.2.2 | |
409 | */ | |
ad493e5e | 410 | int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) |
1da177e4 LT |
411 | { |
412 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
413 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
414 | NULL, 0, 1000); | |
415 | } | |
416 | ||
417 | /* | |
418 | * USB 2.0 spec Section 11.24.2.13 | |
419 | */ | |
420 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
421 | { | |
422 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
423 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
424 | NULL, 0, 1000); | |
425 | } | |
426 | ||
d99f6b41 DW |
427 | static char *to_led_name(int selector) |
428 | { | |
429 | switch (selector) { | |
430 | case HUB_LED_AMBER: | |
431 | return "amber"; | |
432 | case HUB_LED_GREEN: | |
433 | return "green"; | |
434 | case HUB_LED_OFF: | |
435 | return "off"; | |
436 | case HUB_LED_AUTO: | |
437 | return "auto"; | |
438 | default: | |
439 | return "??"; | |
440 | } | |
441 | } | |
442 | ||
1da177e4 LT |
443 | /* |
444 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
445 | * for info about using port indicators | |
446 | */ | |
d99f6b41 | 447 | static void set_port_led(struct usb_hub *hub, int port1, int selector) |
1da177e4 | 448 | { |
d99f6b41 DW |
449 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
450 | int status; | |
451 | ||
452 | status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
1da177e4 | 453 | USB_PORT_FEAT_INDICATOR); |
d99f6b41 DW |
454 | dev_dbg(&port_dev->dev, "indicator %s status %d\n", |
455 | to_led_name(selector), status); | |
1da177e4 LT |
456 | } |
457 | ||
458 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
459 | ||
166b8639 | 460 | static void led_work(struct work_struct *work) |
1da177e4 | 461 | { |
c4028958 DH |
462 | struct usb_hub *hub = |
463 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
464 | struct usb_device *hdev = hub->hdev; |
465 | unsigned i; | |
466 | unsigned changed = 0; | |
467 | int cursor = -1; | |
468 | ||
469 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
470 | return; | |
471 | ||
3bbc47d8 | 472 | for (i = 0; i < hdev->maxchild; i++) { |
1da177e4 LT |
473 | unsigned selector, mode; |
474 | ||
475 | /* 30%-50% duty cycle */ | |
476 | ||
477 | switch (hub->indicator[i]) { | |
478 | /* cycle marker */ | |
479 | case INDICATOR_CYCLE: | |
480 | cursor = i; | |
481 | selector = HUB_LED_AUTO; | |
482 | mode = INDICATOR_AUTO; | |
483 | break; | |
484 | /* blinking green = sw attention */ | |
485 | case INDICATOR_GREEN_BLINK: | |
486 | selector = HUB_LED_GREEN; | |
487 | mode = INDICATOR_GREEN_BLINK_OFF; | |
488 | break; | |
489 | case INDICATOR_GREEN_BLINK_OFF: | |
490 | selector = HUB_LED_OFF; | |
491 | mode = INDICATOR_GREEN_BLINK; | |
492 | break; | |
493 | /* blinking amber = hw attention */ | |
494 | case INDICATOR_AMBER_BLINK: | |
495 | selector = HUB_LED_AMBER; | |
496 | mode = INDICATOR_AMBER_BLINK_OFF; | |
497 | break; | |
498 | case INDICATOR_AMBER_BLINK_OFF: | |
499 | selector = HUB_LED_OFF; | |
500 | mode = INDICATOR_AMBER_BLINK; | |
501 | break; | |
502 | /* blink green/amber = reserved */ | |
503 | case INDICATOR_ALT_BLINK: | |
504 | selector = HUB_LED_GREEN; | |
505 | mode = INDICATOR_ALT_BLINK_OFF; | |
506 | break; | |
507 | case INDICATOR_ALT_BLINK_OFF: | |
508 | selector = HUB_LED_AMBER; | |
509 | mode = INDICATOR_ALT_BLINK; | |
510 | break; | |
511 | default: | |
512 | continue; | |
513 | } | |
514 | if (selector != HUB_LED_AUTO) | |
515 | changed = 1; | |
516 | set_port_led(hub, i + 1, selector); | |
517 | hub->indicator[i] = mode; | |
518 | } | |
519 | if (!changed && blinkenlights) { | |
520 | cursor++; | |
3bbc47d8 | 521 | cursor %= hdev->maxchild; |
1da177e4 LT |
522 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); |
523 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
524 | changed++; | |
525 | } | |
526 | if (changed) | |
22f6a0f0 SD |
527 | queue_delayed_work(system_power_efficient_wq, |
528 | &hub->leds, LED_CYCLE_PERIOD); | |
1da177e4 LT |
529 | } |
530 | ||
531 | /* use a short timeout for hub/port status fetches */ | |
532 | #define USB_STS_TIMEOUT 1000 | |
533 | #define USB_STS_RETRIES 5 | |
534 | ||
535 | /* | |
536 | * USB 2.0 spec Section 11.24.2.6 | |
537 | */ | |
538 | static int get_hub_status(struct usb_device *hdev, | |
539 | struct usb_hub_status *data) | |
540 | { | |
541 | int i, status = -ETIMEDOUT; | |
542 | ||
3824c1dd LP |
543 | for (i = 0; i < USB_STS_RETRIES && |
544 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 LT |
545 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
546 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
547 | data, sizeof(*data), USB_STS_TIMEOUT); | |
548 | } | |
549 | return status; | |
550 | } | |
551 | ||
552 | /* | |
553 | * USB 2.0 spec Section 11.24.2.7 | |
0cdd49a1 | 554 | * USB 3.1 takes into use the wValue and wLength fields, spec Section 10.16.2.6 |
1da177e4 LT |
555 | */ |
556 | static int get_port_status(struct usb_device *hdev, int port1, | |
0cdd49a1 | 557 | void *data, u16 value, u16 length) |
1da177e4 LT |
558 | { |
559 | int i, status = -ETIMEDOUT; | |
560 | ||
3824c1dd LP |
561 | for (i = 0; i < USB_STS_RETRIES && |
562 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 | 563 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
0cdd49a1 MN |
564 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, value, |
565 | port1, data, length, USB_STS_TIMEOUT); | |
1da177e4 LT |
566 | } |
567 | return status; | |
568 | } | |
569 | ||
0cdd49a1 MN |
570 | static int hub_ext_port_status(struct usb_hub *hub, int port1, int type, |
571 | u16 *status, u16 *change, u32 *ext_status) | |
3eb14915 AS |
572 | { |
573 | int ret; | |
0cdd49a1 MN |
574 | int len = 4; |
575 | ||
576 | if (type != HUB_PORT_STATUS) | |
577 | len = 8; | |
3eb14915 AS |
578 | |
579 | mutex_lock(&hub->status_mutex); | |
0cdd49a1 MN |
580 | ret = get_port_status(hub->hdev, port1, &hub->status->port, type, len); |
581 | if (ret < len) { | |
e9e88fb7 AS |
582 | if (ret != -ENODEV) |
583 | dev_err(hub->intfdev, | |
584 | "%s failed (err = %d)\n", __func__, ret); | |
3eb14915 AS |
585 | if (ret >= 0) |
586 | ret = -EIO; | |
587 | } else { | |
588 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
589 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
0cdd49a1 MN |
590 | if (type != HUB_PORT_STATUS && ext_status) |
591 | *ext_status = le32_to_cpu( | |
592 | hub->status->port.dwExtPortStatus); | |
3eb14915 AS |
593 | ret = 0; |
594 | } | |
595 | mutex_unlock(&hub->status_mutex); | |
596 | return ret; | |
597 | } | |
598 | ||
0cdd49a1 MN |
599 | static int hub_port_status(struct usb_hub *hub, int port1, |
600 | u16 *status, u16 *change) | |
601 | { | |
602 | return hub_ext_port_status(hub, port1, HUB_PORT_STATUS, | |
603 | status, change, NULL); | |
604 | } | |
605 | ||
32a69589 | 606 | static void kick_hub_wq(struct usb_hub *hub) |
1da177e4 | 607 | { |
32a69589 | 608 | struct usb_interface *intf; |
1da177e4 | 609 | |
32a69589 PM |
610 | if (hub->disconnected || work_pending(&hub->events)) |
611 | return; | |
8e4ceb38 | 612 | |
32a69589 PM |
613 | /* |
614 | * Suppress autosuspend until the event is proceed. | |
615 | * | |
616 | * Be careful and make sure that the symmetric operation is | |
617 | * always called. We are here only when there is no pending | |
618 | * work for this hub. Therefore put the interface either when | |
619 | * the new work is called or when it is canceled. | |
620 | */ | |
621 | intf = to_usb_interface(hub->intfdev); | |
622 | usb_autopm_get_interface_no_resume(intf); | |
623 | kref_get(&hub->kref); | |
624 | ||
625 | if (queue_work(hub_wq, &hub->events)) | |
626 | return; | |
627 | ||
628 | /* the work has already been scheduled */ | |
629 | usb_autopm_put_interface_async(intf); | |
630 | kref_put(&hub->kref, hub_release); | |
1da177e4 LT |
631 | } |
632 | ||
59d48b3f | 633 | void usb_kick_hub_wq(struct usb_device *hdev) |
1da177e4 | 634 | { |
ad493e5e | 635 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
25118084 AS |
636 | |
637 | if (hub) | |
32a69589 | 638 | kick_hub_wq(hub); |
1da177e4 LT |
639 | } |
640 | ||
4ee823b8 SS |
641 | /* |
642 | * Let the USB core know that a USB 3.0 device has sent a Function Wake Device | |
643 | * Notification, which indicates it had initiated remote wakeup. | |
644 | * | |
645 | * USB 3.0 hubs do not report the port link state change from U3 to U0 when the | |
646 | * device initiates resume, so the USB core will not receive notice of the | |
647 | * resume through the normal hub interrupt URB. | |
648 | */ | |
649 | void usb_wakeup_notification(struct usb_device *hdev, | |
650 | unsigned int portnum) | |
651 | { | |
652 | struct usb_hub *hub; | |
653 | ||
654 | if (!hdev) | |
655 | return; | |
656 | ||
ad493e5e | 657 | hub = usb_hub_to_struct_hub(hdev); |
4ee823b8 SS |
658 | if (hub) { |
659 | set_bit(portnum, hub->wakeup_bits); | |
32a69589 | 660 | kick_hub_wq(hub); |
4ee823b8 SS |
661 | } |
662 | } | |
663 | EXPORT_SYMBOL_GPL(usb_wakeup_notification); | |
1da177e4 LT |
664 | |
665 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 666 | static void hub_irq(struct urb *urb) |
1da177e4 | 667 | { |
ec17cf1c | 668 | struct usb_hub *hub = urb->context; |
e015268d | 669 | int status = urb->status; |
71d2718f | 670 | unsigned i; |
1da177e4 LT |
671 | unsigned long bits; |
672 | ||
e015268d | 673 | switch (status) { |
1da177e4 LT |
674 | case -ENOENT: /* synchronous unlink */ |
675 | case -ECONNRESET: /* async unlink */ | |
676 | case -ESHUTDOWN: /* hardware going away */ | |
677 | return; | |
678 | ||
679 | default: /* presumably an error */ | |
680 | /* Cause a hub reset after 10 consecutive errors */ | |
166b8639 | 681 | dev_dbg(hub->intfdev, "transfer --> %d\n", status); |
1da177e4 LT |
682 | if ((++hub->nerrors < 10) || hub->error) |
683 | goto resubmit; | |
e015268d | 684 | hub->error = status; |
1da177e4 | 685 | /* FALL THROUGH */ |
ec17cf1c | 686 | |
37ebb549 | 687 | /* let hub_wq handle things */ |
1da177e4 LT |
688 | case 0: /* we got data: port status changed */ |
689 | bits = 0; | |
690 | for (i = 0; i < urb->actual_length; ++i) | |
691 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
692 | << (i*8); | |
693 | hub->event_bits[0] = bits; | |
694 | break; | |
695 | } | |
696 | ||
697 | hub->nerrors = 0; | |
698 | ||
37ebb549 | 699 | /* Something happened, let hub_wq figure it out */ |
32a69589 | 700 | kick_hub_wq(hub); |
1da177e4 LT |
701 | |
702 | resubmit: | |
703 | if (hub->quiescing) | |
704 | return; | |
705 | ||
088a3dae KB |
706 | status = usb_submit_urb(hub->urb, GFP_ATOMIC); |
707 | if (status != 0 && status != -ENODEV && status != -EPERM) | |
166b8639 | 708 | dev_err(hub->intfdev, "resubmit --> %d\n", status); |
1da177e4 LT |
709 | } |
710 | ||
711 | /* USB 2.0 spec Section 11.24.2.3 */ | |
712 | static inline int | |
166b8639 | 713 | hub_clear_tt_buffer(struct usb_device *hdev, u16 devinfo, u16 tt) |
1da177e4 | 714 | { |
2c7b871b WG |
715 | /* Need to clear both directions for control ep */ |
716 | if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == | |
717 | USB_ENDPOINT_XFER_CONTROL) { | |
718 | int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
719 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, | |
720 | devinfo ^ 0x8000, tt, NULL, 0, 1000); | |
721 | if (status) | |
722 | return status; | |
723 | } | |
c2f6595f | 724 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
1da177e4 LT |
725 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
726 | tt, NULL, 0, 1000); | |
727 | } | |
728 | ||
729 | /* | |
37ebb549 | 730 | * enumeration blocks hub_wq for a long time. we use keventd instead, since |
1da177e4 LT |
731 | * long blocking there is the exception, not the rule. accordingly, HCDs |
732 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
733 | * both can talk to the same hub concurrently. | |
734 | */ | |
cb88a1b8 | 735 | static void hub_tt_work(struct work_struct *work) |
1da177e4 | 736 | { |
c4028958 | 737 | struct usb_hub *hub = |
cb88a1b8 | 738 | container_of(work, struct usb_hub, tt.clear_work); |
1da177e4 LT |
739 | unsigned long flags; |
740 | ||
166b8639 | 741 | spin_lock_irqsave(&hub->tt.lock, flags); |
3b6054da | 742 | while (!list_empty(&hub->tt.clear_list)) { |
d0f830d3 | 743 | struct list_head *next; |
1da177e4 LT |
744 | struct usb_tt_clear *clear; |
745 | struct usb_device *hdev = hub->hdev; | |
cb88a1b8 | 746 | const struct hc_driver *drv; |
1da177e4 LT |
747 | int status; |
748 | ||
d0f830d3 | 749 | next = hub->tt.clear_list.next; |
166b8639 CM |
750 | clear = list_entry(next, struct usb_tt_clear, clear_list); |
751 | list_del(&clear->clear_list); | |
1da177e4 LT |
752 | |
753 | /* drop lock so HCD can concurrently report other TT errors */ | |
166b8639 CM |
754 | spin_unlock_irqrestore(&hub->tt.lock, flags); |
755 | status = hub_clear_tt_buffer(hdev, clear->devinfo, clear->tt); | |
e9e88fb7 | 756 | if (status && status != -ENODEV) |
166b8639 | 757 | dev_err(&hdev->dev, |
1da177e4 LT |
758 | "clear tt %d (%04x) error %d\n", |
759 | clear->tt, clear->devinfo, status); | |
cb88a1b8 AS |
760 | |
761 | /* Tell the HCD, even if the operation failed */ | |
762 | drv = clear->hcd->driver; | |
763 | if (drv->clear_tt_buffer_complete) | |
764 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); | |
765 | ||
1bc3c9e1 | 766 | kfree(clear); |
cb88a1b8 | 767 | spin_lock_irqsave(&hub->tt.lock, flags); |
1da177e4 | 768 | } |
166b8639 | 769 | spin_unlock_irqrestore(&hub->tt.lock, flags); |
1da177e4 LT |
770 | } |
771 | ||
971fcd49 LT |
772 | /** |
773 | * usb_hub_set_port_power - control hub port's power state | |
41341261 MN |
774 | * @hdev: USB device belonging to the usb hub |
775 | * @hub: target hub | |
971fcd49 LT |
776 | * @port1: port index |
777 | * @set: expected status | |
778 | * | |
779 | * call this function to control port's power via setting or | |
780 | * clearing the port's PORT_POWER feature. | |
626f090c YB |
781 | * |
782 | * Return: 0 if successful. A negative error code otherwise. | |
971fcd49 | 783 | */ |
41341261 MN |
784 | int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, |
785 | int port1, bool set) | |
971fcd49 LT |
786 | { |
787 | int ret; | |
788 | ||
789 | if (set) | |
790 | ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); | |
791 | else | |
ad493e5e LT |
792 | ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
793 | ||
d5c3834e DW |
794 | if (ret) |
795 | return ret; | |
796 | ||
797 | if (set) | |
798 | set_bit(port1, hub->power_bits); | |
799 | else | |
800 | clear_bit(port1, hub->power_bits); | |
801 | return 0; | |
971fcd49 LT |
802 | } |
803 | ||
1da177e4 | 804 | /** |
cb88a1b8 AS |
805 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
806 | * @urb: an URB associated with the failed or incomplete split transaction | |
1da177e4 LT |
807 | * |
808 | * High speed HCDs use this to tell the hub driver that some split control or | |
809 | * bulk transaction failed in a way that requires clearing internal state of | |
810 | * a transaction translator. This is normally detected (and reported) from | |
811 | * interrupt context. | |
812 | * | |
813 | * It may not be possible for that hub to handle additional full (or low) | |
814 | * speed transactions until that state is fully cleared out. | |
626f090c YB |
815 | * |
816 | * Return: 0 if successful. A negative error code otherwise. | |
1da177e4 | 817 | */ |
cb88a1b8 | 818 | int usb_hub_clear_tt_buffer(struct urb *urb) |
1da177e4 | 819 | { |
cb88a1b8 AS |
820 | struct usb_device *udev = urb->dev; |
821 | int pipe = urb->pipe; | |
1da177e4 LT |
822 | struct usb_tt *tt = udev->tt; |
823 | unsigned long flags; | |
824 | struct usb_tt_clear *clear; | |
825 | ||
826 | /* we've got to cope with an arbitrary number of pending TT clears, | |
827 | * since each TT has "at least two" buffers that can need it (and | |
828 | * there can be many TTs per hub). even if they're uncommon. | |
829 | */ | |
d544d273 GKH |
830 | clear = kmalloc(sizeof *clear, GFP_ATOMIC); |
831 | if (clear == NULL) { | |
166b8639 | 832 | dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
1da177e4 | 833 | /* FIXME recover somehow ... RESET_TT? */ |
cb88a1b8 | 834 | return -ENOMEM; |
1da177e4 LT |
835 | } |
836 | ||
837 | /* info that CLEAR_TT_BUFFER needs */ | |
838 | clear->tt = tt->multi ? udev->ttport : 1; | |
839 | clear->devinfo = usb_pipeendpoint (pipe); | |
840 | clear->devinfo |= udev->devnum << 4; | |
166b8639 | 841 | clear->devinfo |= usb_pipecontrol(pipe) |
1da177e4 LT |
842 | ? (USB_ENDPOINT_XFER_CONTROL << 11) |
843 | : (USB_ENDPOINT_XFER_BULK << 11); | |
166b8639 | 844 | if (usb_pipein(pipe)) |
1da177e4 | 845 | clear->devinfo |= 1 << 15; |
cb88a1b8 AS |
846 | |
847 | /* info for completion callback */ | |
848 | clear->hcd = bus_to_hcd(udev->bus); | |
849 | clear->ep = urb->ep; | |
850 | ||
1da177e4 | 851 | /* tell keventd to clear state for this TT */ |
166b8639 CM |
852 | spin_lock_irqsave(&tt->lock, flags); |
853 | list_add_tail(&clear->clear_list, &tt->clear_list); | |
cb88a1b8 | 854 | schedule_work(&tt->clear_work); |
166b8639 | 855 | spin_unlock_irqrestore(&tt->lock, flags); |
cb88a1b8 | 856 | return 0; |
1da177e4 | 857 | } |
cb88a1b8 | 858 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
1da177e4 | 859 | |
7ad3c470 | 860 | static void hub_power_on(struct usb_hub *hub, bool do_delay) |
1da177e4 LT |
861 | { |
862 | int port1; | |
4489a571 AS |
863 | |
864 | /* Enable power on each port. Some hubs have reserved values | |
865 | * of LPSM (> 2) in their descriptors, even though they are | |
866 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
867 | * but only emulate it. In all cases, the ports won't work | |
868 | * unless we send these messages to the hub. | |
869 | */ | |
9262c19d | 870 | if (hub_is_port_power_switchable(hub)) |
1da177e4 | 871 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
872 | else |
873 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
874 | "non-switchable hub\n"); | |
3bbc47d8 | 875 | for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) |
d5c3834e | 876 | if (test_bit(port1, hub->power_bits)) |
ad493e5e LT |
877 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); |
878 | else | |
879 | usb_clear_port_feature(hub->hdev, port1, | |
880 | USB_PORT_FEAT_POWER); | |
8520f380 | 881 | if (do_delay) |
7ad3c470 | 882 | msleep(hub_power_on_good_delay(hub)); |
1da177e4 LT |
883 | } |
884 | ||
1da177e4 LT |
885 | static int hub_hub_status(struct usb_hub *hub, |
886 | u16 *status, u16 *change) | |
887 | { | |
888 | int ret; | |
889 | ||
db90e7a1 | 890 | mutex_lock(&hub->status_mutex); |
1da177e4 | 891 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
e9e88fb7 AS |
892 | if (ret < 0) { |
893 | if (ret != -ENODEV) | |
894 | dev_err(hub->intfdev, | |
895 | "%s failed (err = %d)\n", __func__, ret); | |
896 | } else { | |
1da177e4 | 897 | *status = le16_to_cpu(hub->status->hub.wHubStatus); |
469271f8 | 898 | *change = le16_to_cpu(hub->status->hub.wHubChange); |
1da177e4 LT |
899 | ret = 0; |
900 | } | |
db90e7a1 | 901 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
902 | return ret; |
903 | } | |
904 | ||
41e7e056 SS |
905 | static int hub_set_port_link_state(struct usb_hub *hub, int port1, |
906 | unsigned int link_status) | |
907 | { | |
908 | return set_port_feature(hub->hdev, | |
909 | port1 | (link_status << 3), | |
910 | USB_PORT_FEAT_LINK_STATE); | |
911 | } | |
912 | ||
0458d5b4 | 913 | /* |
6d42fcdb | 914 | * Disable a port and mark a logical connect-change event, so that some |
37ebb549 | 915 | * time later hub_wq will disconnect() any existing usb_device on the port |
0458d5b4 AS |
916 | * and will re-enumerate if there actually is a device attached. |
917 | */ | |
918 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
919 | { | |
d99f6b41 | 920 | dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n"); |
0458d5b4 | 921 | hub_port_disable(hub, port1, 1); |
7d069b7d | 922 | |
0458d5b4 AS |
923 | /* FIXME let caller ask to power down the port: |
924 | * - some devices won't enumerate without a VBUS power cycle | |
925 | * - SRP saves power that way | |
926 | * - ... new call, TBD ... | |
927 | * That's easy if this hub can switch power per-port, and | |
37ebb549 | 928 | * hub_wq reactivates the port later (timer, SRP, etc). |
0458d5b4 AS |
929 | * Powerdown must be optional, because of reset/DFU. |
930 | */ | |
931 | ||
932 | set_bit(port1, hub->change_bits); | |
32a69589 | 933 | kick_hub_wq(hub); |
0458d5b4 AS |
934 | } |
935 | ||
253e0572 AS |
936 | /** |
937 | * usb_remove_device - disable a device's port on its parent hub | |
938 | * @udev: device to be disabled and removed | |
939 | * Context: @udev locked, must be able to sleep. | |
940 | * | |
37ebb549 | 941 | * After @udev's port has been disabled, hub_wq is notified and it will |
253e0572 AS |
942 | * see that the device has been disconnected. When the device is |
943 | * physically unplugged and something is plugged in, the events will | |
944 | * be received and processed normally. | |
626f090c YB |
945 | * |
946 | * Return: 0 if successful. A negative error code otherwise. | |
253e0572 AS |
947 | */ |
948 | int usb_remove_device(struct usb_device *udev) | |
949 | { | |
950 | struct usb_hub *hub; | |
951 | struct usb_interface *intf; | |
952 | ||
953 | if (!udev->parent) /* Can't remove a root hub */ | |
954 | return -EINVAL; | |
ad493e5e | 955 | hub = usb_hub_to_struct_hub(udev->parent); |
253e0572 AS |
956 | intf = to_usb_interface(hub->intfdev); |
957 | ||
958 | usb_autopm_get_interface(intf); | |
959 | set_bit(udev->portnum, hub->removed_bits); | |
960 | hub_port_logical_disconnect(hub, udev->portnum); | |
961 | usb_autopm_put_interface(intf); | |
962 | return 0; | |
963 | } | |
964 | ||
6ee0b270 | 965 | enum hub_activation_type { |
8e4ceb38 | 966 | HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
8520f380 | 967 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
6ee0b270 | 968 | }; |
5e6effae | 969 | |
8520f380 AS |
970 | static void hub_init_func2(struct work_struct *ws); |
971 | static void hub_init_func3(struct work_struct *ws); | |
972 | ||
f2835219 | 973 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
5e6effae AS |
974 | { |
975 | struct usb_device *hdev = hub->hdev; | |
653a39d1 SS |
976 | struct usb_hcd *hcd; |
977 | int ret; | |
5e6effae | 978 | int port1; |
f2835219 | 979 | int status; |
948fea37 | 980 | bool need_debounce_delay = false; |
8520f380 AS |
981 | unsigned delay; |
982 | ||
983 | /* Continue a partial initialization */ | |
e50293ef | 984 | if (type == HUB_INIT2 || type == HUB_INIT3) { |
07d316a2 | 985 | device_lock(&hdev->dev); |
e50293ef AS |
986 | |
987 | /* Was the hub disconnected while we were waiting? */ | |
ca5cbc8b AS |
988 | if (hub->disconnected) |
989 | goto disconnected; | |
e50293ef AS |
990 | if (type == HUB_INIT2) |
991 | goto init2; | |
8520f380 | 992 | goto init3; |
e50293ef AS |
993 | } |
994 | kref_get(&hub->kref); | |
5e6effae | 995 | |
a45aa3b3 EF |
996 | /* The superspeed hub except for root hub has to use Hub Depth |
997 | * value as an offset into the route string to locate the bits | |
998 | * it uses to determine the downstream port number. So hub driver | |
999 | * should send a set hub depth request to superspeed hub after | |
1000 | * the superspeed hub is set configuration in initialization or | |
1001 | * reset procedure. | |
1002 | * | |
1003 | * After a resume, port power should still be on. | |
f2835219 AS |
1004 | * For any other type of activation, turn it on. |
1005 | */ | |
8520f380 | 1006 | if (type != HUB_RESUME) { |
a45aa3b3 EF |
1007 | if (hdev->parent && hub_is_superspeed(hdev)) { |
1008 | ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
1009 | HUB_SET_DEPTH, USB_RT_HUB, | |
1010 | hdev->level - 1, 0, NULL, 0, | |
1011 | USB_CTRL_SET_TIMEOUT); | |
1012 | if (ret < 0) | |
1013 | dev_err(hub->intfdev, | |
1014 | "set hub depth failed\n"); | |
1015 | } | |
8520f380 AS |
1016 | |
1017 | /* Speed up system boot by using a delayed_work for the | |
1018 | * hub's initial power-up delays. This is pretty awkward | |
1019 | * and the implementation looks like a home-brewed sort of | |
1020 | * setjmp/longjmp, but it saves at least 100 ms for each | |
1021 | * root hub (assuming usbcore is compiled into the kernel | |
1022 | * rather than as a module). It adds up. | |
1023 | * | |
1024 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME | |
1025 | * because for those activation types the ports have to be | |
1026 | * operational when we return. In theory this could be done | |
1027 | * for HUB_POST_RESET, but it's easier not to. | |
1028 | */ | |
1029 | if (type == HUB_INIT) { | |
17a364e2 | 1030 | delay = hub_power_on_good_delay(hub); |
7ad3c470 DW |
1031 | |
1032 | hub_power_on(hub, false); | |
77fa83cf | 1033 | INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); |
22f6a0f0 SD |
1034 | queue_delayed_work(system_power_efficient_wq, |
1035 | &hub->init_work, | |
8520f380 | 1036 | msecs_to_jiffies(delay)); |
61fbeba1 AS |
1037 | |
1038 | /* Suppress autosuspend until init is done */ | |
8e4ceb38 AS |
1039 | usb_autopm_get_interface_no_resume( |
1040 | to_usb_interface(hub->intfdev)); | |
8520f380 | 1041 | return; /* Continues at init2: below */ |
653a39d1 SS |
1042 | } else if (type == HUB_RESET_RESUME) { |
1043 | /* The internal host controller state for the hub device | |
1044 | * may be gone after a host power loss on system resume. | |
1045 | * Update the device's info so the HW knows it's a hub. | |
1046 | */ | |
1047 | hcd = bus_to_hcd(hdev->bus); | |
1048 | if (hcd->driver->update_hub_device) { | |
1049 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1050 | &hub->tt, GFP_NOIO); | |
1051 | if (ret < 0) { | |
1052 | dev_err(hub->intfdev, "Host not " | |
1053 | "accepting hub info " | |
1054 | "update.\n"); | |
1055 | dev_err(hub->intfdev, "LS/FS devices " | |
1056 | "and hubs may not work " | |
1057 | "under this hub\n."); | |
1058 | } | |
1059 | } | |
1060 | hub_power_on(hub, true); | |
8520f380 AS |
1061 | } else { |
1062 | hub_power_on(hub, true); | |
1063 | } | |
1064 | } | |
1065 | init2: | |
f2835219 | 1066 | |
d99f6b41 | 1067 | /* |
37ebb549 | 1068 | * Check each port and set hub->change_bits to let hub_wq know |
6ee0b270 | 1069 | * which ports need attention. |
5e6effae AS |
1070 | */ |
1071 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
d99f6b41 DW |
1072 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
1073 | struct usb_device *udev = port_dev->child; | |
5e6effae AS |
1074 | u16 portstatus, portchange; |
1075 | ||
6ee0b270 AS |
1076 | portstatus = portchange = 0; |
1077 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
245b2eec GR |
1078 | if (status) |
1079 | goto abort; | |
1080 | ||
6ee0b270 | 1081 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) |
d99f6b41 DW |
1082 | dev_dbg(&port_dev->dev, "status %04x change %04x\n", |
1083 | portstatus, portchange); | |
6ee0b270 | 1084 | |
d99f6b41 DW |
1085 | /* |
1086 | * After anything other than HUB_RESUME (i.e., initialization | |
6ee0b270 AS |
1087 | * or any sort of reset), every port should be disabled. |
1088 | * Unconnected ports should likewise be disabled (paranoia), | |
1089 | * and so should ports for which we have no usb_device. | |
1090 | */ | |
1091 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( | |
1092 | type != HUB_RESUME || | |
1093 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
1094 | !udev || | |
1095 | udev->state == USB_STATE_NOTATTACHED)) { | |
9f0a6cd3 AX |
1096 | /* |
1097 | * USB3 protocol ports will automatically transition | |
1098 | * to Enabled state when detect an USB3.0 device attach. | |
fd1ac4cf DW |
1099 | * Do not disable USB3 protocol ports, just pretend |
1100 | * power was lost | |
9f0a6cd3 | 1101 | */ |
fd1ac4cf DW |
1102 | portstatus &= ~USB_PORT_STAT_ENABLE; |
1103 | if (!hub_is_superspeed(hdev)) | |
ad493e5e | 1104 | usb_clear_port_feature(hdev, port1, |
9f0a6cd3 | 1105 | USB_PORT_FEAT_ENABLE); |
5e6effae AS |
1106 | } |
1107 | ||
948fea37 AS |
1108 | /* Clear status-change flags; we'll debounce later */ |
1109 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
1110 | need_debounce_delay = true; | |
ad493e5e | 1111 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1112 | USB_PORT_FEAT_C_CONNECTION); |
1113 | } | |
1114 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
1115 | need_debounce_delay = true; | |
ad493e5e | 1116 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1117 | USB_PORT_FEAT_C_ENABLE); |
1118 | } | |
e92aee33 JW |
1119 | if (portchange & USB_PORT_STAT_C_RESET) { |
1120 | need_debounce_delay = true; | |
1121 | usb_clear_port_feature(hub->hdev, port1, | |
1122 | USB_PORT_FEAT_C_RESET); | |
1123 | } | |
79c3dd81 DZ |
1124 | if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
1125 | hub_is_superspeed(hub->hdev)) { | |
1126 | need_debounce_delay = true; | |
ad493e5e | 1127 | usb_clear_port_feature(hub->hdev, port1, |
79c3dd81 DZ |
1128 | USB_PORT_FEAT_C_BH_PORT_RESET); |
1129 | } | |
253e0572 AS |
1130 | /* We can forget about a "removed" device when there's a |
1131 | * physical disconnect or the connect status changes. | |
1132 | */ | |
1133 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
1134 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
1135 | clear_bit(port1, hub->removed_bits); | |
1136 | ||
6ee0b270 | 1137 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
37ebb549 | 1138 | /* Tell hub_wq to disconnect the device or |
6ee0b270 AS |
1139 | * check for a new connection |
1140 | */ | |
08d1dec6 SG |
1141 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || |
1142 | (portstatus & USB_PORT_STAT_OVERCURRENT)) | |
6ee0b270 AS |
1143 | set_bit(port1, hub->change_bits); |
1144 | ||
1145 | } else if (portstatus & USB_PORT_STAT_ENABLE) { | |
72937e1e SS |
1146 | bool port_resumed = (portstatus & |
1147 | USB_PORT_STAT_LINK_STATE) == | |
1148 | USB_SS_PORT_LS_U0; | |
6ee0b270 AS |
1149 | /* The power session apparently survived the resume. |
1150 | * If there was an overcurrent or suspend change | |
37ebb549 | 1151 | * (i.e., remote wakeup request), have hub_wq |
72937e1e SS |
1152 | * take care of it. Look at the port link state |
1153 | * for USB 3.0 hubs, since they don't have a suspend | |
1154 | * change bit, and they don't set the port link change | |
1155 | * bit on device-initiated resume. | |
6ee0b270 | 1156 | */ |
72937e1e SS |
1157 | if (portchange || (hub_is_superspeed(hub->hdev) && |
1158 | port_resumed)) | |
6ee0b270 | 1159 | set_bit(port1, hub->change_bits); |
5e6effae | 1160 | |
6ee0b270 | 1161 | } else if (udev->persist_enabled) { |
6ee0b270 | 1162 | #ifdef CONFIG_PM |
5e6effae | 1163 | udev->reset_resume = 1; |
6ee0b270 | 1164 | #endif |
ad493e5e LT |
1165 | /* Don't set the change_bits when the device |
1166 | * was powered off. | |
1167 | */ | |
d5c3834e | 1168 | if (test_bit(port1, hub->power_bits)) |
ad493e5e | 1169 | set_bit(port1, hub->change_bits); |
8808f00c | 1170 | |
6ee0b270 | 1171 | } else { |
37ebb549 | 1172 | /* The power session is gone; tell hub_wq */ |
6ee0b270 AS |
1173 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
1174 | set_bit(port1, hub->change_bits); | |
5e6effae | 1175 | } |
5e6effae AS |
1176 | } |
1177 | ||
948fea37 AS |
1178 | /* If no port-status-change flags were set, we don't need any |
1179 | * debouncing. If flags were set we can try to debounce the | |
37ebb549 | 1180 | * ports all at once right now, instead of letting hub_wq do them |
948fea37 AS |
1181 | * one at a time later on. |
1182 | * | |
37ebb549 | 1183 | * If any port-status changes do occur during this delay, hub_wq |
948fea37 AS |
1184 | * will see them later and handle them normally. |
1185 | */ | |
8520f380 AS |
1186 | if (need_debounce_delay) { |
1187 | delay = HUB_DEBOUNCE_STABLE; | |
1188 | ||
1189 | /* Don't do a long sleep inside a workqueue routine */ | |
1190 | if (type == HUB_INIT2) { | |
77fa83cf | 1191 | INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); |
22f6a0f0 SD |
1192 | queue_delayed_work(system_power_efficient_wq, |
1193 | &hub->init_work, | |
8520f380 | 1194 | msecs_to_jiffies(delay)); |
07d316a2 | 1195 | device_unlock(&hdev->dev); |
8520f380 AS |
1196 | return; /* Continues at init3: below */ |
1197 | } else { | |
1198 | msleep(delay); | |
1199 | } | |
1200 | } | |
1201 | init3: | |
f2835219 AS |
1202 | hub->quiescing = 0; |
1203 | ||
1204 | status = usb_submit_urb(hub->urb, GFP_NOIO); | |
1205 | if (status < 0) | |
1206 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
1207 | if (hub->has_indicators && blinkenlights) | |
22f6a0f0 SD |
1208 | queue_delayed_work(system_power_efficient_wq, |
1209 | &hub->leds, LED_CYCLE_PERIOD); | |
f2835219 AS |
1210 | |
1211 | /* Scan all ports that need attention */ | |
32a69589 | 1212 | kick_hub_wq(hub); |
245b2eec | 1213 | abort: |
ca5cbc8b AS |
1214 | if (type == HUB_INIT2 || type == HUB_INIT3) { |
1215 | /* Allow autosuspend if it was suppressed */ | |
1216 | disconnected: | |
8e4ceb38 | 1217 | usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); |
07d316a2 | 1218 | device_unlock(&hdev->dev); |
ca5cbc8b | 1219 | } |
e50293ef AS |
1220 | |
1221 | kref_put(&hub->kref, hub_release); | |
5e6effae AS |
1222 | } |
1223 | ||
8520f380 AS |
1224 | /* Implement the continuations for the delays above */ |
1225 | static void hub_init_func2(struct work_struct *ws) | |
1226 | { | |
1227 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
1228 | ||
1229 | hub_activate(hub, HUB_INIT2); | |
1230 | } | |
1231 | ||
1232 | static void hub_init_func3(struct work_struct *ws) | |
1233 | { | |
1234 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
1235 | ||
1236 | hub_activate(hub, HUB_INIT3); | |
1237 | } | |
1238 | ||
4330354f AS |
1239 | enum hub_quiescing_type { |
1240 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND | |
1241 | }; | |
1242 | ||
1243 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) | |
1244 | { | |
1245 | struct usb_device *hdev = hub->hdev; | |
1246 | int i; | |
1247 | ||
37ebb549 | 1248 | /* hub_wq and related activity won't re-trigger */ |
4330354f AS |
1249 | hub->quiescing = 1; |
1250 | ||
1251 | if (type != HUB_SUSPEND) { | |
1252 | /* Disconnect all the children */ | |
1253 | for (i = 0; i < hdev->maxchild; ++i) { | |
ff823c79 LT |
1254 | if (hub->ports[i]->child) |
1255 | usb_disconnect(&hub->ports[i]->child); | |
4330354f AS |
1256 | } |
1257 | } | |
1258 | ||
37ebb549 | 1259 | /* Stop hub_wq and related activity */ |
4330354f AS |
1260 | usb_kill_urb(hub->urb); |
1261 | if (hub->has_indicators) | |
1262 | cancel_delayed_work_sync(&hub->leds); | |
1263 | if (hub->tt.hub) | |
036546bf | 1264 | flush_work(&hub->tt.clear_work); |
4330354f AS |
1265 | } |
1266 | ||
600856c2 AS |
1267 | static void hub_pm_barrier_for_all_ports(struct usb_hub *hub) |
1268 | { | |
1269 | int i; | |
1270 | ||
1271 | for (i = 0; i < hub->hdev->maxchild; ++i) | |
1272 | pm_runtime_barrier(&hub->ports[i]->dev); | |
1273 | } | |
1274 | ||
3eb14915 AS |
1275 | /* caller has locked the hub device */ |
1276 | static int hub_pre_reset(struct usb_interface *intf) | |
1277 | { | |
1278 | struct usb_hub *hub = usb_get_intfdata(intf); | |
1279 | ||
4330354f | 1280 | hub_quiesce(hub, HUB_PRE_RESET); |
600856c2 AS |
1281 | hub->in_reset = 1; |
1282 | hub_pm_barrier_for_all_ports(hub); | |
f07600cf | 1283 | return 0; |
7d069b7d AS |
1284 | } |
1285 | ||
1286 | /* caller has locked the hub device */ | |
f07600cf | 1287 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 1288 | { |
7de18d8b AS |
1289 | struct usb_hub *hub = usb_get_intfdata(intf); |
1290 | ||
600856c2 AS |
1291 | hub->in_reset = 0; |
1292 | hub_pm_barrier_for_all_ports(hub); | |
f2835219 | 1293 | hub_activate(hub, HUB_POST_RESET); |
f07600cf | 1294 | return 0; |
7d069b7d AS |
1295 | } |
1296 | ||
1da177e4 LT |
1297 | static int hub_configure(struct usb_hub *hub, |
1298 | struct usb_endpoint_descriptor *endpoint) | |
1299 | { | |
b356b7c7 | 1300 | struct usb_hcd *hcd; |
1da177e4 LT |
1301 | struct usb_device *hdev = hub->hdev; |
1302 | struct device *hub_dev = hub->intfdev; | |
1303 | u16 hubstatus, hubchange; | |
74ad9bd2 | 1304 | u16 wHubCharacteristics; |
1da177e4 | 1305 | unsigned int pipe; |
fa2a9566 | 1306 | int maxp, ret, i; |
7cbe5dca | 1307 | char *message = "out of memory"; |
430ee58e SAS |
1308 | unsigned unit_load; |
1309 | unsigned full_load; | |
d8521afe | 1310 | unsigned maxchild; |
1da177e4 | 1311 | |
d697cdda | 1312 | hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
1da177e4 | 1313 | if (!hub->buffer) { |
1da177e4 LT |
1314 | ret = -ENOMEM; |
1315 | goto fail; | |
1316 | } | |
1317 | ||
1318 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
1319 | if (!hub->status) { | |
1da177e4 LT |
1320 | ret = -ENOMEM; |
1321 | goto fail; | |
1322 | } | |
db90e7a1 | 1323 | mutex_init(&hub->status_mutex); |
1da177e4 | 1324 | |
bec444cd | 1325 | hub->descriptor = kzalloc(sizeof(*hub->descriptor), GFP_KERNEL); |
1da177e4 | 1326 | if (!hub->descriptor) { |
1da177e4 LT |
1327 | ret = -ENOMEM; |
1328 | goto fail; | |
1329 | } | |
1330 | ||
1331 | /* Request the entire hub descriptor. | |
1332 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
2c25a2c8 | 1333 | * but a (non-SS) hub can/will return fewer bytes here. |
1da177e4 | 1334 | */ |
dbe79bbe | 1335 | ret = get_hub_descriptor(hdev, hub->descriptor); |
1da177e4 LT |
1336 | if (ret < 0) { |
1337 | message = "can't read hub descriptor"; | |
1338 | goto fail; | |
93491ced JH |
1339 | } |
1340 | ||
1341 | maxchild = USB_MAXCHILDREN; | |
1342 | if (hub_is_superspeed(hdev)) | |
1343 | maxchild = min_t(unsigned, maxchild, USB_SS_MAXPORTS); | |
1344 | ||
1345 | if (hub->descriptor->bNbrPorts > maxchild) { | |
1da177e4 LT |
1346 | message = "hub has too many ports!"; |
1347 | ret = -ENODEV; | |
1348 | goto fail; | |
769d7368 DL |
1349 | } else if (hub->descriptor->bNbrPorts == 0) { |
1350 | message = "hub doesn't have any ports!"; | |
1351 | ret = -ENODEV; | |
1352 | goto fail; | |
1da177e4 LT |
1353 | } |
1354 | ||
d8521afe DW |
1355 | maxchild = hub->descriptor->bNbrPorts; |
1356 | dev_info(hub_dev, "%d port%s detected\n", maxchild, | |
1357 | (maxchild == 1) ? "" : "s"); | |
1da177e4 | 1358 | |
d8521afe | 1359 | hub->ports = kzalloc(maxchild * sizeof(struct usb_port *), GFP_KERNEL); |
ff823c79 | 1360 | if (!hub->ports) { |
7cbe5dca AS |
1361 | ret = -ENOMEM; |
1362 | goto fail; | |
1363 | } | |
1364 | ||
74ad9bd2 | 1365 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
430ee58e SAS |
1366 | if (hub_is_superspeed(hdev)) { |
1367 | unit_load = 150; | |
1368 | full_load = 900; | |
1369 | } else { | |
1370 | unit_load = 100; | |
1371 | full_load = 500; | |
1372 | } | |
1da177e4 | 1373 | |
dbe79bbe JY |
1374 | /* FIXME for USB 3.0, skip for now */ |
1375 | if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && | |
1376 | !(hub_is_superspeed(hdev))) { | |
469271f8 | 1377 | char portstr[USB_MAXCHILDREN + 1]; |
1da177e4 | 1378 | |
d8521afe | 1379 | for (i = 0; i < maxchild; i++) |
dbe79bbe | 1380 | portstr[i] = hub->descriptor->u.hs.DeviceRemovable |
1da177e4 LT |
1381 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
1382 | ? 'F' : 'R'; | |
d8521afe | 1383 | portstr[maxchild] = 0; |
1da177e4 LT |
1384 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); |
1385 | } else | |
1386 | dev_dbg(hub_dev, "standalone hub\n"); | |
1387 | ||
74ad9bd2 | 1388 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
7bf01185 AD |
1389 | case HUB_CHAR_COMMON_LPSM: |
1390 | dev_dbg(hub_dev, "ganged power switching\n"); | |
1391 | break; | |
1392 | case HUB_CHAR_INDV_PORT_LPSM: | |
1393 | dev_dbg(hub_dev, "individual port power switching\n"); | |
1394 | break; | |
1395 | case HUB_CHAR_NO_LPSM: | |
1396 | case HUB_CHAR_LPSM: | |
1397 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
1398 | break; | |
1da177e4 LT |
1399 | } |
1400 | ||
74ad9bd2 | 1401 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
7bf01185 AD |
1402 | case HUB_CHAR_COMMON_OCPM: |
1403 | dev_dbg(hub_dev, "global over-current protection\n"); | |
1404 | break; | |
1405 | case HUB_CHAR_INDV_PORT_OCPM: | |
1406 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
1407 | break; | |
1408 | case HUB_CHAR_NO_OCPM: | |
1409 | case HUB_CHAR_OCPM: | |
1410 | dev_dbg(hub_dev, "no over-current protection\n"); | |
1411 | break; | |
1da177e4 LT |
1412 | } |
1413 | ||
17248569 CM |
1414 | spin_lock_init(&hub->tt.lock); |
1415 | INIT_LIST_HEAD(&hub->tt.clear_list); | |
cb88a1b8 | 1416 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
1da177e4 | 1417 | switch (hdev->descriptor.bDeviceProtocol) { |
7bf01185 AD |
1418 | case USB_HUB_PR_FS: |
1419 | break; | |
1420 | case USB_HUB_PR_HS_SINGLE_TT: | |
1421 | dev_dbg(hub_dev, "Single TT\n"); | |
1422 | hub->tt.hub = hdev; | |
1423 | break; | |
1424 | case USB_HUB_PR_HS_MULTI_TT: | |
1425 | ret = usb_set_interface(hdev, 0, 1); | |
1426 | if (ret == 0) { | |
1427 | dev_dbg(hub_dev, "TT per port\n"); | |
1428 | hub->tt.multi = 1; | |
1429 | } else | |
1430 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
1431 | ret); | |
1432 | hub->tt.hub = hdev; | |
1433 | break; | |
1434 | case USB_HUB_PR_SS: | |
1435 | /* USB 3.0 hubs don't have a TT */ | |
1436 | break; | |
1437 | default: | |
1438 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
1439 | hdev->descriptor.bDeviceProtocol); | |
1440 | break; | |
1da177e4 LT |
1441 | } |
1442 | ||
e09711ae | 1443 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 1444 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
469271f8 MB |
1445 | case HUB_TTTT_8_BITS: |
1446 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
1447 | hub->tt.think_time = 666; | |
e09711ae DB |
1448 | dev_dbg(hub_dev, "TT requires at most %d " |
1449 | "FS bit times (%d ns)\n", | |
469271f8 MB |
1450 | 8, hub->tt.think_time); |
1451 | } | |
1452 | break; | |
1453 | case HUB_TTTT_16_BITS: | |
1454 | hub->tt.think_time = 666 * 2; | |
1455 | dev_dbg(hub_dev, "TT requires at most %d " | |
1456 | "FS bit times (%d ns)\n", | |
1457 | 16, hub->tt.think_time); | |
1458 | break; | |
1459 | case HUB_TTTT_24_BITS: | |
1460 | hub->tt.think_time = 666 * 3; | |
1461 | dev_dbg(hub_dev, "TT requires at most %d " | |
1462 | "FS bit times (%d ns)\n", | |
1463 | 24, hub->tt.think_time); | |
1464 | break; | |
1465 | case HUB_TTTT_32_BITS: | |
1466 | hub->tt.think_time = 666 * 4; | |
1467 | dev_dbg(hub_dev, "TT requires at most %d " | |
1468 | "FS bit times (%d ns)\n", | |
1469 | 32, hub->tt.think_time); | |
1470 | break; | |
1da177e4 LT |
1471 | } |
1472 | ||
1473 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 1474 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
1475 | hub->has_indicators = 1; |
1476 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
1477 | } | |
1478 | ||
1479 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
1480 | hub->descriptor->bPwrOn2PwrGood * 2); | |
1481 | ||
1482 | /* power budgeting mostly matters with bus-powered hubs, | |
1483 | * and battery-powered root hubs (may provide just 8 mA). | |
1484 | */ | |
d9e1e148 | 1485 | ret = usb_get_std_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); |
15b7336e | 1486 | if (ret) { |
1da177e4 LT |
1487 | message = "can't get hub status"; |
1488 | goto fail; | |
1489 | } | |
430ee58e | 1490 | hcd = bus_to_hcd(hdev->bus); |
7d35b929 | 1491 | if (hdev == hdev->bus->root_hub) { |
430ee58e SAS |
1492 | if (hcd->power_budget > 0) |
1493 | hdev->bus_mA = hcd->power_budget; | |
1494 | else | |
d8521afe | 1495 | hdev->bus_mA = full_load * maxchild; |
430ee58e SAS |
1496 | if (hdev->bus_mA >= full_load) |
1497 | hub->mA_per_port = full_load; | |
55c52718 AS |
1498 | else { |
1499 | hub->mA_per_port = hdev->bus_mA; | |
1500 | hub->limited_power = 1; | |
1501 | } | |
7d35b929 | 1502 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
430ee58e SAS |
1503 | int remaining = hdev->bus_mA - |
1504 | hub->descriptor->bHubContrCurrent; | |
1505 | ||
1da177e4 LT |
1506 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
1507 | hub->descriptor->bHubContrCurrent); | |
55c52718 | 1508 | hub->limited_power = 1; |
55c52718 | 1509 | |
d8521afe | 1510 | if (remaining < maxchild * unit_load) |
430ee58e | 1511 | dev_warn(hub_dev, |
55c52718 AS |
1512 | "insufficient power available " |
1513 | "to use all downstream ports\n"); | |
430ee58e SAS |
1514 | hub->mA_per_port = unit_load; /* 7.2.1 */ |
1515 | ||
55c52718 AS |
1516 | } else { /* Self-powered external hub */ |
1517 | /* FIXME: What about battery-powered external hubs that | |
1518 | * provide less current per port? */ | |
430ee58e | 1519 | hub->mA_per_port = full_load; |
7d35b929 | 1520 | } |
430ee58e | 1521 | if (hub->mA_per_port < full_load) |
55c52718 AS |
1522 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", |
1523 | hub->mA_per_port); | |
1da177e4 LT |
1524 | |
1525 | ret = hub_hub_status(hub, &hubstatus, &hubchange); | |
1526 | if (ret < 0) { | |
1527 | message = "can't get hub status"; | |
1528 | goto fail; | |
1529 | } | |
1530 | ||
1531 | /* local power status reports aren't always correct */ | |
1532 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
1533 | dev_dbg(hub_dev, "local power source is %s\n", | |
1534 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
1535 | ? "lost (inactive)" : "good"); | |
1536 | ||
74ad9bd2 | 1537 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
1538 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
1539 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
1540 | ||
88fafff9 | 1541 | /* set up the interrupt endpoint |
1542 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
1543 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
1544 | * to send more data (and thus cause overflow). For root hubs, | |
1545 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
1546 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
1547 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
1548 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
1549 | ||
1550 | if (maxp > sizeof(*hub->buffer)) | |
1551 | maxp = sizeof(*hub->buffer); | |
1552 | ||
1553 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
1554 | if (!hub->urb) { | |
1da177e4 LT |
1555 | ret = -ENOMEM; |
1556 | goto fail; | |
1557 | } | |
1558 | ||
1559 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
1560 | hub, endpoint->bInterval); | |
1da177e4 LT |
1561 | |
1562 | /* maybe cycle the hub leds */ | |
1563 | if (hub->has_indicators && blinkenlights) | |
469271f8 | 1564 | hub->indicator[0] = INDICATOR_CYCLE; |
1da177e4 | 1565 | |
d8521afe DW |
1566 | mutex_lock(&usb_port_peer_mutex); |
1567 | for (i = 0; i < maxchild; i++) { | |
e58547eb KM |
1568 | ret = usb_hub_create_port_device(hub, i + 1); |
1569 | if (ret < 0) { | |
fa2a9566 LT |
1570 | dev_err(hub->intfdev, |
1571 | "couldn't create port%d device.\n", i + 1); | |
d8521afe | 1572 | break; |
e58547eb KM |
1573 | } |
1574 | } | |
d8521afe | 1575 | hdev->maxchild = i; |
e3d10505 DW |
1576 | for (i = 0; i < hdev->maxchild; i++) { |
1577 | struct usb_port *port_dev = hub->ports[i]; | |
1578 | ||
1579 | pm_runtime_put(&port_dev->dev); | |
1580 | } | |
1581 | ||
d8521afe DW |
1582 | mutex_unlock(&usb_port_peer_mutex); |
1583 | if (ret < 0) | |
1584 | goto fail; | |
fa2a9566 | 1585 | |
37ebb549 | 1586 | /* Update the HCD's internal representation of this hub before hub_wq |
e3d95580 DW |
1587 | * starts getting port status changes for devices under the hub. |
1588 | */ | |
1589 | if (hcd->driver->update_hub_device) { | |
1590 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1591 | &hub->tt, GFP_KERNEL); | |
1592 | if (ret < 0) { | |
1593 | message = "can't update HCD hub info"; | |
1594 | goto fail; | |
1595 | } | |
1596 | } | |
1597 | ||
d2123fd9 LT |
1598 | usb_hub_adjust_deviceremovable(hdev, hub->descriptor); |
1599 | ||
f2835219 | 1600 | hub_activate(hub, HUB_INIT); |
1da177e4 LT |
1601 | return 0; |
1602 | ||
1603 | fail: | |
17248569 | 1604 | dev_err(hub_dev, "config failed, %s (err %d)\n", |
1da177e4 LT |
1605 | message, ret); |
1606 | /* hub_disconnect() frees urb and descriptor */ | |
1607 | return ret; | |
1608 | } | |
1609 | ||
e8054854 AS |
1610 | static void hub_release(struct kref *kref) |
1611 | { | |
1612 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
1613 | ||
5d14f323 | 1614 | usb_put_dev(hub->hdev); |
e8054854 AS |
1615 | usb_put_intf(to_usb_interface(hub->intfdev)); |
1616 | kfree(hub); | |
1617 | } | |
1618 | ||
1da177e4 LT |
1619 | static unsigned highspeed_hubs; |
1620 | ||
1621 | static void hub_disconnect(struct usb_interface *intf) | |
1622 | { | |
8816230e | 1623 | struct usb_hub *hub = usb_get_intfdata(intf); |
fa286188 | 1624 | struct usb_device *hdev = interface_to_usbdev(intf); |
543d7784 | 1625 | int port1; |
fa2a9566 | 1626 | |
32a69589 PM |
1627 | /* |
1628 | * Stop adding new hub events. We do not want to block here and thus | |
1629 | * will not try to remove any pending work item. | |
1630 | */ | |
e8054854 | 1631 | hub->disconnected = 1; |
1da177e4 | 1632 | |
7de18d8b AS |
1633 | /* Disconnect all children and quiesce the hub */ |
1634 | hub->error = 0; | |
4330354f | 1635 | hub_quiesce(hub, HUB_DISCONNECT); |
7de18d8b | 1636 | |
d8521afe DW |
1637 | mutex_lock(&usb_port_peer_mutex); |
1638 | ||
543d7784 AS |
1639 | /* Avoid races with recursively_mark_NOTATTACHED() */ |
1640 | spin_lock_irq(&device_state_lock); | |
1641 | port1 = hdev->maxchild; | |
1642 | hdev->maxchild = 0; | |
1643 | usb_set_intfdata(intf, NULL); | |
1644 | spin_unlock_irq(&device_state_lock); | |
1f2235b8 | 1645 | |
543d7784 AS |
1646 | for (; port1 > 0; --port1) |
1647 | usb_hub_remove_port_device(hub, port1); | |
1da177e4 | 1648 | |
d8521afe DW |
1649 | mutex_unlock(&usb_port_peer_mutex); |
1650 | ||
e8054854 | 1651 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
1652 | highspeed_hubs--; |
1653 | ||
1da177e4 | 1654 | usb_free_urb(hub->urb); |
fa2a9566 | 1655 | kfree(hub->ports); |
1bc3c9e1 | 1656 | kfree(hub->descriptor); |
1bc3c9e1 | 1657 | kfree(hub->status); |
d697cdda | 1658 | kfree(hub->buffer); |
1da177e4 | 1659 | |
971fcd49 | 1660 | pm_suspend_ignore_children(&intf->dev, false); |
e8054854 | 1661 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
1662 | } |
1663 | ||
c94dc34f EK |
1664 | static bool hub_descriptor_is_sane(struct usb_host_interface *desc) |
1665 | { | |
1666 | /* Some hubs have a subclass of 1, which AFAICT according to the */ | |
1667 | /* specs is not defined, but it works */ | |
1668 | if (desc->desc.bInterfaceSubClass != 0 && | |
1669 | desc->desc.bInterfaceSubClass != 1) | |
1670 | return false; | |
1671 | ||
1672 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
1673 | if (desc->desc.bNumEndpoints != 1) | |
1674 | return false; | |
1675 | ||
1676 | /* If the first endpoint is not interrupt IN, we'd better punt! */ | |
1677 | if (!usb_endpoint_is_int_in(&desc->endpoint[0].desc)) | |
1678 | return false; | |
1679 | ||
1680 | return true; | |
1681 | } | |
1682 | ||
1da177e4 LT |
1683 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) |
1684 | { | |
1685 | struct usb_host_interface *desc; | |
1da177e4 LT |
1686 | struct usb_device *hdev; |
1687 | struct usb_hub *hub; | |
1688 | ||
1689 | desc = intf->cur_altsetting; | |
1690 | hdev = interface_to_usbdev(intf); | |
1691 | ||
596d789a ML |
1692 | /* |
1693 | * Set default autosuspend delay as 0 to speedup bus suspend, | |
1694 | * based on the below considerations: | |
1695 | * | |
1696 | * - Unlike other drivers, the hub driver does not rely on the | |
1697 | * autosuspend delay to provide enough time to handle a wakeup | |
1698 | * event, and the submitted status URB is just to check future | |
1699 | * change on hub downstream ports, so it is safe to do it. | |
1700 | * | |
1701 | * - The patch might cause one or more auto supend/resume for | |
1702 | * below very rare devices when they are plugged into hub | |
1703 | * first time: | |
1704 | * | |
1705 | * devices having trouble initializing, and disconnect | |
1706 | * themselves from the bus and then reconnect a second | |
1707 | * or so later | |
1708 | * | |
1709 | * devices just for downloading firmware, and disconnects | |
1710 | * themselves after completing it | |
1711 | * | |
1712 | * For these quite rare devices, their drivers may change the | |
1713 | * autosuspend delay of their parent hub in the probe() to one | |
1714 | * appropriate value to avoid the subtle problem if someone | |
1715 | * does care it. | |
1716 | * | |
1717 | * - The patch may cause one or more auto suspend/resume on | |
1718 | * hub during running 'lsusb', but it is probably too | |
1719 | * infrequent to worry about. | |
1720 | * | |
1721 | * - Change autosuspend delay of hub can avoid unnecessary auto | |
1722 | * suspend timer for hub, also may decrease power consumption | |
1723 | * of USB bus. | |
bdd405d2 RQ |
1724 | * |
1725 | * - If user has indicated to prevent autosuspend by passing | |
1726 | * usbcore.autosuspend = -1 then keep autosuspend disabled. | |
596d789a | 1727 | */ |
ceb6c9c8 | 1728 | #ifdef CONFIG_PM |
bdd405d2 RQ |
1729 | if (hdev->dev.power.autosuspend_delay >= 0) |
1730 | pm_runtime_set_autosuspend_delay(&hdev->dev, 0); | |
a9ef803d | 1731 | #endif |
596d789a | 1732 | |
8ef42ddd AS |
1733 | /* |
1734 | * Hubs have proper suspend/resume support, except for root hubs | |
1735 | * where the controller driver doesn't have bus_suspend and | |
1736 | * bus_resume methods. | |
1737 | */ | |
1738 | if (hdev->parent) { /* normal device */ | |
1739 | usb_enable_autosuspend(hdev); | |
1740 | } else { /* root hub */ | |
1741 | const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; | |
1742 | ||
1743 | if (drv->bus_suspend && drv->bus_resume) | |
1744 | usb_enable_autosuspend(hdev); | |
1745 | } | |
088f7fec | 1746 | |
38f3ad5e | 1747 | if (hdev->level == MAX_TOPO_LEVEL) { |
b9cef6c3 WF |
1748 | dev_err(&intf->dev, |
1749 | "Unsupported bus topology: hub nested too deep\n"); | |
38f3ad5e FB |
1750 | return -E2BIG; |
1751 | } | |
1752 | ||
89ccbdc9 DB |
1753 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
1754 | if (hdev->parent) { | |
1755 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
1756 | return -ENODEV; | |
1757 | } | |
1758 | #endif | |
1759 | ||
c94dc34f | 1760 | if (!hub_descriptor_is_sane(desc)) { |
17248569 | 1761 | dev_err(&intf->dev, "bad descriptor, ignoring hub\n"); |
1da177e4 LT |
1762 | return -EIO; |
1763 | } | |
1764 | ||
1da177e4 | 1765 | /* We found a hub */ |
17248569 | 1766 | dev_info(&intf->dev, "USB hub found\n"); |
1da177e4 | 1767 | |
0a1ef3b5 | 1768 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
b74e7062 | 1769 | if (!hub) |
1da177e4 | 1770 | return -ENOMEM; |
1da177e4 | 1771 | |
e8054854 | 1772 | kref_init(&hub->kref); |
1da177e4 LT |
1773 | hub->intfdev = &intf->dev; |
1774 | hub->hdev = hdev; | |
c4028958 | 1775 | INIT_DELAYED_WORK(&hub->leds, led_work); |
8520f380 | 1776 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
32a69589 | 1777 | INIT_WORK(&hub->events, hub_event); |
e8054854 | 1778 | usb_get_intf(intf); |
5d14f323 | 1779 | usb_get_dev(hdev); |
1da177e4 | 1780 | |
17248569 | 1781 | usb_set_intfdata(intf, hub); |
40f122f3 | 1782 | intf->needs_remote_wakeup = 1; |
971fcd49 | 1783 | pm_suspend_ignore_children(&intf->dev, true); |
1da177e4 LT |
1784 | |
1785 | if (hdev->speed == USB_SPEED_HIGH) | |
1786 | highspeed_hubs++; | |
1787 | ||
e6f30dea ML |
1788 | if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) |
1789 | hub->quirk_check_port_auto_suspend = 1; | |
1790 | ||
c94dc34f | 1791 | if (hub_configure(hub, &desc->endpoint[0].desc) >= 0) |
1da177e4 LT |
1792 | return 0; |
1793 | ||
17248569 | 1794 | hub_disconnect(intf); |
1da177e4 LT |
1795 | return -ENODEV; |
1796 | } | |
1797 | ||
1798 | static int | |
1799 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
1800 | { | |
17248569 | 1801 | struct usb_device *hdev = interface_to_usbdev(intf); |
ad493e5e | 1802 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1da177e4 LT |
1803 | |
1804 | /* assert ifno == 0 (part of hub spec) */ | |
1805 | switch (code) { | |
1806 | case USBDEVFS_HUB_PORTINFO: { | |
1807 | struct usbdevfs_hub_portinfo *info = user_data; | |
1808 | int i; | |
1809 | ||
1810 | spin_lock_irq(&device_state_lock); | |
1811 | if (hdev->devnum <= 0) | |
1812 | info->nports = 0; | |
1813 | else { | |
1814 | info->nports = hdev->maxchild; | |
1815 | for (i = 0; i < info->nports; i++) { | |
ff823c79 | 1816 | if (hub->ports[i]->child == NULL) |
1da177e4 LT |
1817 | info->port[i] = 0; |
1818 | else | |
1819 | info->port[i] = | |
ff823c79 | 1820 | hub->ports[i]->child->devnum; |
1da177e4 LT |
1821 | } |
1822 | } | |
1823 | spin_unlock_irq(&device_state_lock); | |
1824 | ||
1825 | return info->nports + 1; | |
1826 | } | |
1827 | ||
1828 | default: | |
1829 | return -ENOSYS; | |
1830 | } | |
1831 | } | |
1832 | ||
7cbe5dca AS |
1833 | /* |
1834 | * Allow user programs to claim ports on a hub. When a device is attached | |
1835 | * to one of these "claimed" ports, the program will "own" the device. | |
1836 | */ | |
1837 | static int find_port_owner(struct usb_device *hdev, unsigned port1, | |
9b6f0c4b | 1838 | struct usb_dev_state ***ppowner) |
7cbe5dca | 1839 | { |
41341261 MN |
1840 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1841 | ||
7cbe5dca AS |
1842 | if (hdev->state == USB_STATE_NOTATTACHED) |
1843 | return -ENODEV; | |
1844 | if (port1 == 0 || port1 > hdev->maxchild) | |
1845 | return -EINVAL; | |
1846 | ||
41341261 | 1847 | /* Devices not managed by the hub driver |
7cbe5dca AS |
1848 | * will always have maxchild equal to 0. |
1849 | */ | |
41341261 | 1850 | *ppowner = &(hub->ports[port1 - 1]->port_owner); |
7cbe5dca AS |
1851 | return 0; |
1852 | } | |
1853 | ||
1854 | /* In the following three functions, the caller must hold hdev's lock */ | |
336c5c31 | 1855 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, |
9b6f0c4b | 1856 | struct usb_dev_state *owner) |
7cbe5dca AS |
1857 | { |
1858 | int rc; | |
9b6f0c4b | 1859 | struct usb_dev_state **powner; |
7cbe5dca AS |
1860 | |
1861 | rc = find_port_owner(hdev, port1, &powner); | |
1862 | if (rc) | |
1863 | return rc; | |
1864 | if (*powner) | |
1865 | return -EBUSY; | |
1866 | *powner = owner; | |
1867 | return rc; | |
1868 | } | |
6080cd0e | 1869 | EXPORT_SYMBOL_GPL(usb_hub_claim_port); |
7cbe5dca | 1870 | |
336c5c31 | 1871 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, |
9b6f0c4b | 1872 | struct usb_dev_state *owner) |
7cbe5dca AS |
1873 | { |
1874 | int rc; | |
9b6f0c4b | 1875 | struct usb_dev_state **powner; |
7cbe5dca AS |
1876 | |
1877 | rc = find_port_owner(hdev, port1, &powner); | |
1878 | if (rc) | |
1879 | return rc; | |
1880 | if (*powner != owner) | |
1881 | return -ENOENT; | |
1882 | *powner = NULL; | |
1883 | return rc; | |
1884 | } | |
6080cd0e | 1885 | EXPORT_SYMBOL_GPL(usb_hub_release_port); |
7cbe5dca | 1886 | |
9b6f0c4b | 1887 | void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner) |
7cbe5dca | 1888 | { |
ad493e5e | 1889 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
7cbe5dca | 1890 | int n; |
7cbe5dca | 1891 | |
fa2a9566 LT |
1892 | for (n = 0; n < hdev->maxchild; n++) { |
1893 | if (hub->ports[n]->port_owner == owner) | |
1894 | hub->ports[n]->port_owner = NULL; | |
7cbe5dca | 1895 | } |
fa2a9566 | 1896 | |
7cbe5dca AS |
1897 | } |
1898 | ||
1899 | /* The caller must hold udev's lock */ | |
1900 | bool usb_device_is_owned(struct usb_device *udev) | |
1901 | { | |
1902 | struct usb_hub *hub; | |
1903 | ||
1904 | if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) | |
1905 | return false; | |
ad493e5e | 1906 | hub = usb_hub_to_struct_hub(udev->parent); |
fa2a9566 | 1907 | return !!hub->ports[udev->portnum - 1]->port_owner; |
7cbe5dca AS |
1908 | } |
1909 | ||
1da177e4 LT |
1910 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1911 | { | |
ad493e5e | 1912 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
1da177e4 LT |
1913 | int i; |
1914 | ||
1915 | for (i = 0; i < udev->maxchild; ++i) { | |
ff823c79 LT |
1916 | if (hub->ports[i]->child) |
1917 | recursively_mark_NOTATTACHED(hub->ports[i]->child); | |
1da177e4 | 1918 | } |
9bbdf1e0 | 1919 | if (udev->state == USB_STATE_SUSPENDED) |
15123006 | 1920 | udev->active_duration -= jiffies; |
1da177e4 LT |
1921 | udev->state = USB_STATE_NOTATTACHED; |
1922 | } | |
1923 | ||
1924 | /** | |
1925 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1926 | * @udev: pointer to device whose state should be changed | |
1927 | * @new_state: new state value to be stored | |
1928 | * | |
1929 | * udev->state is _not_ fully protected by the device lock. Although | |
1930 | * most transitions are made only while holding the lock, the state can | |
1931 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1932 | * is so that devices can be marked as disconnected as soon as possible, | |
1933 | * without having to wait for any semaphores to be released. As a result, | |
1934 | * all changes to any device's state must be protected by the | |
1935 | * device_state_lock spinlock. | |
1936 | * | |
1937 | * Once a device has been added to the device tree, all changes to its state | |
1938 | * should be made using this routine. The state should _not_ be set directly. | |
1939 | * | |
1940 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1941 | * Otherwise udev->state is set to new_state, and if new_state is | |
1942 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1943 | * to USB_STATE_NOTATTACHED. | |
1944 | */ | |
1945 | void usb_set_device_state(struct usb_device *udev, | |
1946 | enum usb_device_state new_state) | |
1947 | { | |
1948 | unsigned long flags; | |
4681b171 | 1949 | int wakeup = -1; |
1da177e4 LT |
1950 | |
1951 | spin_lock_irqsave(&device_state_lock, flags); | |
1952 | if (udev->state == USB_STATE_NOTATTACHED) | |
1953 | ; /* do nothing */ | |
b94dc6b5 | 1954 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1955 | |
1956 | /* root hub wakeup capabilities are managed out-of-band | |
1957 | * and may involve silicon errata ... ignore them here. | |
1958 | */ | |
1959 | if (udev->parent) { | |
645daaab AS |
1960 | if (udev->state == USB_STATE_SUSPENDED |
1961 | || new_state == USB_STATE_SUSPENDED) | |
1962 | ; /* No change to wakeup settings */ | |
1963 | else if (new_state == USB_STATE_CONFIGURED) | |
ddbe1fca LB |
1964 | wakeup = (udev->quirks & |
1965 | USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 : | |
1966 | udev->actconfig->desc.bmAttributes & | |
1967 | USB_CONFIG_ATT_WAKEUP; | |
645daaab | 1968 | else |
4681b171 | 1969 | wakeup = 0; |
fb669cc0 | 1970 | } |
15123006 SS |
1971 | if (udev->state == USB_STATE_SUSPENDED && |
1972 | new_state != USB_STATE_SUSPENDED) | |
1973 | udev->active_duration -= jiffies; | |
1974 | else if (new_state == USB_STATE_SUSPENDED && | |
1975 | udev->state != USB_STATE_SUSPENDED) | |
1976 | udev->active_duration += jiffies; | |
645daaab | 1977 | udev->state = new_state; |
b94dc6b5 | 1978 | } else |
1da177e4 LT |
1979 | recursively_mark_NOTATTACHED(udev); |
1980 | spin_unlock_irqrestore(&device_state_lock, flags); | |
4681b171 RW |
1981 | if (wakeup >= 0) |
1982 | device_set_wakeup_capable(&udev->dev, wakeup); | |
1da177e4 | 1983 | } |
6da9c990 | 1984 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
1da177e4 | 1985 | |
8af548dc | 1986 | /* |
3b29b68b AS |
1987 | * Choose a device number. |
1988 | * | |
1989 | * Device numbers are used as filenames in usbfs. On USB-1.1 and | |
1990 | * USB-2.0 buses they are also used as device addresses, however on | |
1991 | * USB-3.0 buses the address is assigned by the controller hardware | |
1992 | * and it usually is not the same as the device number. | |
1993 | * | |
8af548dc IPG |
1994 | * WUSB devices are simple: they have no hubs behind, so the mapping |
1995 | * device <-> virtual port number becomes 1:1. Why? to simplify the | |
1996 | * life of the device connection logic in | |
1997 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret | |
1998 | * handshake we need to assign a temporary address in the unauthorized | |
1999 | * space. For simplicity we use the first virtual port number found to | |
2000 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] | |
2001 | * and that becomes it's address [X < 128] or its unauthorized address | |
2002 | * [X | 0x80]. | |
2003 | * | |
2004 | * We add 1 as an offset to the one-based USB-stack port number | |
2005 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr | |
2006 | * 0 is reserved by USB for default address; (b) Linux's USB stack | |
2007 | * uses always #1 for the root hub of the controller. So USB stack's | |
2008 | * port #1, which is wusb virtual-port #0 has address #2. | |
c6515272 SS |
2009 | * |
2010 | * Devices connected under xHCI are not as simple. The host controller | |
2011 | * supports virtualization, so the hardware assigns device addresses and | |
2012 | * the HCD must setup data structures before issuing a set address | |
2013 | * command to the hardware. | |
8af548dc | 2014 | */ |
3b29b68b | 2015 | static void choose_devnum(struct usb_device *udev) |
1da177e4 LT |
2016 | { |
2017 | int devnum; | |
2018 | struct usb_bus *bus = udev->bus; | |
2019 | ||
638139eb | 2020 | /* be safe when more hub events are proceed in parallel */ |
feb26ac3 | 2021 | mutex_lock(&bus->devnum_next_mutex); |
8af548dc IPG |
2022 | if (udev->wusb) { |
2023 | devnum = udev->portnum + 1; | |
2024 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); | |
2025 | } else { | |
2026 | /* Try to allocate the next devnum beginning at | |
2027 | * bus->devnum_next. */ | |
2028 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
2029 | bus->devnum_next); | |
2030 | if (devnum >= 128) | |
2031 | devnum = find_next_zero_bit(bus->devmap.devicemap, | |
2032 | 128, 1); | |
469271f8 | 2033 | bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); |
8af548dc | 2034 | } |
1da177e4 LT |
2035 | if (devnum < 128) { |
2036 | set_bit(devnum, bus->devmap.devicemap); | |
2037 | udev->devnum = devnum; | |
2038 | } | |
feb26ac3 | 2039 | mutex_unlock(&bus->devnum_next_mutex); |
1da177e4 LT |
2040 | } |
2041 | ||
3b29b68b | 2042 | static void release_devnum(struct usb_device *udev) |
1da177e4 LT |
2043 | { |
2044 | if (udev->devnum > 0) { | |
2045 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
2046 | udev->devnum = -1; | |
2047 | } | |
2048 | } | |
2049 | ||
3b29b68b | 2050 | static void update_devnum(struct usb_device *udev, int devnum) |
4953d141 DV |
2051 | { |
2052 | /* The address for a WUSB device is managed by wusbcore. */ | |
2053 | if (!udev->wusb) | |
2054 | udev->devnum = devnum; | |
2055 | } | |
2056 | ||
f7410ced HX |
2057 | static void hub_free_dev(struct usb_device *udev) |
2058 | { | |
2059 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2060 | ||
2061 | /* Root hubs aren't real devices, so don't free HCD resources */ | |
2062 | if (hcd->driver->free_dev && udev->parent) | |
2063 | hcd->driver->free_dev(hcd, udev); | |
2064 | } | |
2065 | ||
7027df36 DW |
2066 | static void hub_disconnect_children(struct usb_device *udev) |
2067 | { | |
2068 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); | |
2069 | int i; | |
2070 | ||
2071 | /* Free up all the children before we remove this device */ | |
2072 | for (i = 0; i < udev->maxchild; i++) { | |
2073 | if (hub->ports[i]->child) | |
2074 | usb_disconnect(&hub->ports[i]->child); | |
2075 | } | |
2076 | } | |
2077 | ||
1da177e4 LT |
2078 | /** |
2079 | * usb_disconnect - disconnect a device (usbcore-internal) | |
2080 | * @pdev: pointer to device being disconnected | |
2081 | * Context: !in_interrupt () | |
2082 | * | |
2083 | * Something got disconnected. Get rid of it and all of its children. | |
2084 | * | |
2085 | * If *pdev is a normal device then the parent hub must already be locked. | |
a4b5d606 | 2086 | * If *pdev is a root hub then the caller must hold the usb_bus_idr_lock, |
db8f2aa3 | 2087 | * which protects the set of root hubs as well as the list of buses. |
1da177e4 LT |
2088 | * |
2089 | * Only hub drivers (including virtual root hub drivers for host | |
2090 | * controllers) should ever call this. | |
2091 | * | |
2092 | * This call is synchronous, and may not be used in an interrupt context. | |
2093 | */ | |
2094 | void usb_disconnect(struct usb_device **pdev) | |
2095 | { | |
7027df36 DW |
2096 | struct usb_port *port_dev = NULL; |
2097 | struct usb_device *udev = *pdev; | |
5b1dc209 PC |
2098 | struct usb_hub *hub = NULL; |
2099 | int port1 = 1; | |
1da177e4 | 2100 | |
1da177e4 LT |
2101 | /* mark the device as inactive, so any further urb submissions for |
2102 | * this device (and any of its children) will fail immediately. | |
25985edc | 2103 | * this quiesces everything except pending urbs. |
1da177e4 LT |
2104 | */ |
2105 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
3b29b68b AS |
2106 | dev_info(&udev->dev, "USB disconnect, device number %d\n", |
2107 | udev->devnum); | |
1da177e4 | 2108 | |
f5cccf49 GR |
2109 | /* |
2110 | * Ensure that the pm runtime code knows that the USB device | |
2111 | * is in the process of being disconnected. | |
2112 | */ | |
2113 | pm_runtime_barrier(&udev->dev); | |
2114 | ||
9ad3d6cc AS |
2115 | usb_lock_device(udev); |
2116 | ||
7027df36 | 2117 | hub_disconnect_children(udev); |
1da177e4 LT |
2118 | |
2119 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
2120 | * cleaning up all state associated with the current configuration | |
2121 | * so that the hardware is now fully quiesced. | |
2122 | */ | |
17248569 | 2123 | dev_dbg(&udev->dev, "unregistering device\n"); |
1da177e4 | 2124 | usb_disable_device(udev, 0); |
cde217a5 | 2125 | usb_hcd_synchronize_unlinks(udev); |
1da177e4 | 2126 | |
fde26380 | 2127 | if (udev->parent) { |
7027df36 DW |
2128 | port1 = udev->portnum; |
2129 | hub = usb_hub_to_struct_hub(udev->parent); | |
2130 | port_dev = hub->ports[port1 - 1]; | |
fde26380 LT |
2131 | |
2132 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2133 | sysfs_remove_link(&port_dev->dev.kobj, "device"); | |
971fcd49 | 2134 | |
7027df36 DW |
2135 | /* |
2136 | * As usb_port_runtime_resume() de-references udev, make | |
2137 | * sure no resumes occur during removal | |
2138 | */ | |
2139 | if (!test_and_set_bit(port1, hub->child_usage_bits)) | |
2140 | pm_runtime_get_sync(&port_dev->dev); | |
fde26380 LT |
2141 | } |
2142 | ||
3b23dd6f | 2143 | usb_remove_ep_devs(&udev->ep0); |
782da727 AS |
2144 | usb_unlock_device(udev); |
2145 | ||
2146 | /* Unregister the device. The device driver is responsible | |
3b23dd6f AS |
2147 | * for de-configuring the device and invoking the remove-device |
2148 | * notifier chain (used by usbfs and possibly others). | |
782da727 AS |
2149 | */ |
2150 | device_del(&udev->dev); | |
3099e75a | 2151 | |
782da727 | 2152 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
2153 | * (or root_hub) pointer. |
2154 | */ | |
3b29b68b | 2155 | release_devnum(udev); |
1da177e4 LT |
2156 | |
2157 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
2158 | spin_lock_irq(&device_state_lock); | |
2159 | *pdev = NULL; | |
2160 | spin_unlock_irq(&device_state_lock); | |
2161 | ||
7027df36 DW |
2162 | if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits)) |
2163 | pm_runtime_put(&port_dev->dev); | |
2164 | ||
f7410ced HX |
2165 | hub_free_dev(udev); |
2166 | ||
782da727 | 2167 | put_device(&udev->dev); |
1da177e4 LT |
2168 | } |
2169 | ||
f2a383e4 | 2170 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
1da177e4 LT |
2171 | static void show_string(struct usb_device *udev, char *id, char *string) |
2172 | { | |
2173 | if (!string) | |
2174 | return; | |
f2ec522e | 2175 | dev_info(&udev->dev, "%s: %s\n", id, string); |
1da177e4 LT |
2176 | } |
2177 | ||
f2a383e4 GKH |
2178 | static void announce_device(struct usb_device *udev) |
2179 | { | |
2180 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", | |
2181 | le16_to_cpu(udev->descriptor.idVendor), | |
2182 | le16_to_cpu(udev->descriptor.idProduct)); | |
b9cef6c3 WF |
2183 | dev_info(&udev->dev, |
2184 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", | |
f2a383e4 GKH |
2185 | udev->descriptor.iManufacturer, |
2186 | udev->descriptor.iProduct, | |
2187 | udev->descriptor.iSerialNumber); | |
2188 | show_string(udev, "Product", udev->product); | |
2189 | show_string(udev, "Manufacturer", udev->manufacturer); | |
2190 | show_string(udev, "SerialNumber", udev->serial); | |
2191 | } | |
1da177e4 | 2192 | #else |
f2a383e4 | 2193 | static inline void announce_device(struct usb_device *udev) { } |
1da177e4 LT |
2194 | #endif |
2195 | ||
1da177e4 | 2196 | |
3ede760f | 2197 | /** |
8d8558d1 | 2198 | * usb_enumerate_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
2199 | * @udev: newly addressed device (in ADDRESS state) |
2200 | * | |
8d8558d1 | 2201 | * Finish enumeration for On-The-Go devices |
626f090c YB |
2202 | * |
2203 | * Return: 0 if successful. A negative error code otherwise. | |
3ede760f | 2204 | */ |
8d8558d1 | 2205 | static int usb_enumerate_device_otg(struct usb_device *udev) |
1da177e4 | 2206 | { |
d9d16e8a | 2207 | int err = 0; |
1da177e4 LT |
2208 | |
2209 | #ifdef CONFIG_USB_OTG | |
2210 | /* | |
2211 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
2212 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
2213 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
2214 | */ | |
2215 | if (!udev->bus->is_b_host | |
2216 | && udev->config | |
2217 | && udev->parent == udev->bus->root_hub) { | |
2eb5052e | 2218 | struct usb_otg_descriptor *desc = NULL; |
1da177e4 | 2219 | struct usb_bus *bus = udev->bus; |
7d2d641c | 2220 | unsigned port1 = udev->portnum; |
1da177e4 LT |
2221 | |
2222 | /* descriptor may appear anywhere in config */ | |
7d2d641c LJ |
2223 | err = __usb_get_extra_descriptor(udev->rawdescriptors[0], |
2224 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
2225 | USB_DT_OTG, (void **) &desc); | |
2226 | if (err || !(desc->bmAttributes & USB_OTG_HNP)) | |
2227 | return 0; | |
2228 | ||
2229 | dev_info(&udev->dev, "Dual-Role OTG device on %sHNP port\n", | |
2230 | (port1 == bus->otg_port) ? "" : "non-"); | |
2231 | ||
2232 | /* enable HNP before suspend, it's simpler */ | |
2233 | if (port1 == bus->otg_port) { | |
2234 | bus->b_hnp_enable = 1; | |
2235 | err = usb_control_msg(udev, | |
2236 | usb_sndctrlpipe(udev, 0), | |
2237 | USB_REQ_SET_FEATURE, 0, | |
2238 | USB_DEVICE_B_HNP_ENABLE, | |
2239 | 0, NULL, 0, | |
2240 | USB_CTRL_SET_TIMEOUT); | |
2241 | if (err < 0) { | |
2242 | /* | |
2243 | * OTG MESSAGE: report errors here, | |
2244 | * customize to match your product. | |
2245 | */ | |
2246 | dev_err(&udev->dev, "can't set HNP mode: %d\n", | |
2247 | err); | |
2248 | bus->b_hnp_enable = 0; | |
1da177e4 | 2249 | } |
7d2d641c LJ |
2250 | } else if (desc->bLength == sizeof |
2251 | (struct usb_otg_descriptor)) { | |
2252 | /* Set a_alt_hnp_support for legacy otg device */ | |
2253 | err = usb_control_msg(udev, | |
2254 | usb_sndctrlpipe(udev, 0), | |
2255 | USB_REQ_SET_FEATURE, 0, | |
2256 | USB_DEVICE_A_ALT_HNP_SUPPORT, | |
2257 | 0, NULL, 0, | |
2258 | USB_CTRL_SET_TIMEOUT); | |
2259 | if (err < 0) | |
2260 | dev_err(&udev->dev, | |
2261 | "set a_alt_hnp_support failed: %d\n", | |
2262 | err); | |
1da177e4 LT |
2263 | } |
2264 | } | |
1da177e4 | 2265 | #endif |
d9d16e8a IPG |
2266 | return err; |
2267 | } | |
2268 | ||
2269 | ||
2270 | /** | |
8d8558d1 | 2271 | * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
d9d16e8a IPG |
2272 | * @udev: newly addressed device (in ADDRESS state) |
2273 | * | |
2274 | * This is only called by usb_new_device() and usb_authorize_device() | |
2275 | * and FIXME -- all comments that apply to them apply here wrt to | |
2276 | * environment. | |
2277 | * | |
2278 | * If the device is WUSB and not authorized, we don't attempt to read | |
2279 | * the string descriptors, as they will be errored out by the device | |
2280 | * until it has been authorized. | |
626f090c YB |
2281 | * |
2282 | * Return: 0 if successful. A negative error code otherwise. | |
d9d16e8a | 2283 | */ |
8d8558d1 | 2284 | static int usb_enumerate_device(struct usb_device *udev) |
d9d16e8a IPG |
2285 | { |
2286 | int err; | |
026f3fcb | 2287 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 2288 | |
d9d16e8a IPG |
2289 | if (udev->config == NULL) { |
2290 | err = usb_get_configuration(udev); | |
2291 | if (err < 0) { | |
e9e88fb7 AS |
2292 | if (err != -ENODEV) |
2293 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
2294 | err); | |
80da2e0d | 2295 | return err; |
d9d16e8a IPG |
2296 | } |
2297 | } | |
83e83ecb TP |
2298 | |
2299 | /* read the standard strings and cache them if present */ | |
2300 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
2301 | udev->manufacturer = usb_cache_string(udev, | |
2302 | udev->descriptor.iManufacturer); | |
2303 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
2304 | ||
8d8558d1 | 2305 | err = usb_enumerate_device_otg(udev); |
80da2e0d LP |
2306 | if (err < 0) |
2307 | return err; | |
2308 | ||
026f3fcb | 2309 | if (IS_ENABLED(CONFIG_USB_OTG_WHITELIST) && hcd->tpl_support && |
e5a9d621 | 2310 | !is_targeted(udev)) { |
026f3fcb PC |
2311 | /* Maybe it can talk to us, though we can't talk to it. |
2312 | * (Includes HNP test device.) | |
2313 | */ | |
e5a9d621 PC |
2314 | if (IS_ENABLED(CONFIG_USB_OTG) && (udev->bus->b_hnp_enable |
2315 | || udev->bus->is_b_host)) { | |
026f3fcb PC |
2316 | err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND); |
2317 | if (err < 0) | |
2318 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
2319 | } | |
2320 | return -ENOTSUPP; | |
2321 | } | |
2322 | ||
80da2e0d LP |
2323 | usb_detect_interface_quirks(udev); |
2324 | ||
2325 | return 0; | |
d9d16e8a IPG |
2326 | } |
2327 | ||
d35e70d5 MG |
2328 | static void set_usb_port_removable(struct usb_device *udev) |
2329 | { | |
2330 | struct usb_device *hdev = udev->parent; | |
2331 | struct usb_hub *hub; | |
2332 | u8 port = udev->portnum; | |
2333 | u16 wHubCharacteristics; | |
2334 | bool removable = true; | |
2335 | ||
2336 | if (!hdev) | |
2337 | return; | |
2338 | ||
ad493e5e | 2339 | hub = usb_hub_to_struct_hub(udev->parent); |
d35e70d5 | 2340 | |
92bfbf71 MG |
2341 | /* |
2342 | * If the platform firmware has provided information about a port, | |
2343 | * use that to determine whether it's removable. | |
2344 | */ | |
2345 | switch (hub->ports[udev->portnum - 1]->connect_type) { | |
2346 | case USB_PORT_CONNECT_TYPE_HOT_PLUG: | |
2347 | udev->removable = USB_DEVICE_REMOVABLE; | |
2348 | return; | |
2349 | case USB_PORT_CONNECT_TYPE_HARD_WIRED: | |
58339c2e | 2350 | case USB_PORT_NOT_USED: |
92bfbf71 MG |
2351 | udev->removable = USB_DEVICE_FIXED; |
2352 | return; | |
58339c2e MG |
2353 | default: |
2354 | break; | |
92bfbf71 MG |
2355 | } |
2356 | ||
2357 | /* | |
2358 | * Otherwise, check whether the hub knows whether a port is removable | |
2359 | * or not | |
2360 | */ | |
d35e70d5 MG |
2361 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
2362 | ||
2363 | if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) | |
2364 | return; | |
2365 | ||
2366 | if (hub_is_superspeed(hdev)) { | |
ca3c1539 LT |
2367 | if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) |
2368 | & (1 << port)) | |
d35e70d5 MG |
2369 | removable = false; |
2370 | } else { | |
2371 | if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) | |
2372 | removable = false; | |
2373 | } | |
2374 | ||
2375 | if (removable) | |
2376 | udev->removable = USB_DEVICE_REMOVABLE; | |
2377 | else | |
2378 | udev->removable = USB_DEVICE_FIXED; | |
a4204ff0 | 2379 | |
d35e70d5 | 2380 | } |
d9d16e8a IPG |
2381 | |
2382 | /** | |
2383 | * usb_new_device - perform initial device setup (usbcore-internal) | |
2384 | * @udev: newly addressed device (in ADDRESS state) | |
2385 | * | |
8d8558d1 AS |
2386 | * This is called with devices which have been detected but not fully |
2387 | * enumerated. The device descriptor is available, but not descriptors | |
d9d16e8a IPG |
2388 | * for any device configuration. The caller must have locked either |
2389 | * the parent hub (if udev is a normal device) or else the | |
a4b5d606 | 2390 | * usb_bus_idr_lock (if udev is a root hub). The parent's pointer to |
d9d16e8a IPG |
2391 | * udev has already been installed, but udev is not yet visible through |
2392 | * sysfs or other filesystem code. | |
2393 | * | |
d9d16e8a IPG |
2394 | * This call is synchronous, and may not be used in an interrupt context. |
2395 | * | |
2396 | * Only the hub driver or root-hub registrar should ever call this. | |
626f090c YB |
2397 | * |
2398 | * Return: Whether the device is configured properly or not. Zero if the | |
2399 | * interface was registered with the driver core; else a negative errno | |
2400 | * value. | |
2401 | * | |
d9d16e8a IPG |
2402 | */ |
2403 | int usb_new_device(struct usb_device *udev) | |
2404 | { | |
2405 | int err; | |
2406 | ||
16985408 | 2407 | if (udev->parent) { |
16985408 DS |
2408 | /* Initialize non-root-hub device wakeup to disabled; |
2409 | * device (un)configuration controls wakeup capable | |
2410 | * sysfs power/wakeup controls wakeup enabled/disabled | |
2411 | */ | |
2412 | device_init_wakeup(&udev->dev, 0); | |
16985408 DS |
2413 | } |
2414 | ||
9bbdf1e0 AS |
2415 | /* Tell the runtime-PM framework the device is active */ |
2416 | pm_runtime_set_active(&udev->dev); | |
c08512c7 | 2417 | pm_runtime_get_noresume(&udev->dev); |
fcc4a01e | 2418 | pm_runtime_use_autosuspend(&udev->dev); |
9bbdf1e0 AS |
2419 | pm_runtime_enable(&udev->dev); |
2420 | ||
c08512c7 AS |
2421 | /* By default, forbid autosuspend for all devices. It will be |
2422 | * allowed for hubs during binding. | |
2423 | */ | |
2424 | usb_disable_autosuspend(udev); | |
2425 | ||
8d8558d1 | 2426 | err = usb_enumerate_device(udev); /* Read descriptors */ |
d9d16e8a IPG |
2427 | if (err < 0) |
2428 | goto fail; | |
c6515272 SS |
2429 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
2430 | udev->devnum, udev->bus->busnum, | |
2431 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
9f8b17e6 KS |
2432 | /* export the usbdev device-node for libusb */ |
2433 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
2434 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
2435 | ||
6cd13201 AS |
2436 | /* Tell the world! */ |
2437 | announce_device(udev); | |
195af2cc | 2438 | |
b04b3156 TT |
2439 | if (udev->serial) |
2440 | add_device_randomness(udev->serial, strlen(udev->serial)); | |
2441 | if (udev->product) | |
2442 | add_device_randomness(udev->product, strlen(udev->product)); | |
2443 | if (udev->manufacturer) | |
2444 | add_device_randomness(udev->manufacturer, | |
2445 | strlen(udev->manufacturer)); | |
2446 | ||
927bc916 | 2447 | device_enable_async_suspend(&udev->dev); |
d35e70d5 | 2448 | |
a4204ff0 | 2449 | /* check whether the hub or firmware marks this port as non-removable */ |
d35e70d5 MG |
2450 | if (udev->parent) |
2451 | set_usb_port_removable(udev); | |
2452 | ||
782da727 | 2453 | /* Register the device. The device driver is responsible |
3b23dd6f AS |
2454 | * for configuring the device and invoking the add-device |
2455 | * notifier chain (used by usbfs and possibly others). | |
782da727 | 2456 | */ |
9f8b17e6 | 2457 | err = device_add(&udev->dev); |
1da177e4 LT |
2458 | if (err) { |
2459 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
2460 | goto fail; | |
2461 | } | |
9ad3d6cc | 2462 | |
fde26380 LT |
2463 | /* Create link files between child device and usb port device. */ |
2464 | if (udev->parent) { | |
ad493e5e | 2465 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
d5c3834e DW |
2466 | int port1 = udev->portnum; |
2467 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
fde26380 LT |
2468 | |
2469 | err = sysfs_create_link(&udev->dev.kobj, | |
2470 | &port_dev->dev.kobj, "port"); | |
2471 | if (err) | |
2472 | goto fail; | |
2473 | ||
2474 | err = sysfs_create_link(&port_dev->dev.kobj, | |
2475 | &udev->dev.kobj, "device"); | |
2476 | if (err) { | |
2477 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2478 | goto fail; | |
2479 | } | |
971fcd49 | 2480 | |
d5c3834e DW |
2481 | if (!test_and_set_bit(port1, hub->child_usage_bits)) |
2482 | pm_runtime_get_sync(&port_dev->dev); | |
fde26380 LT |
2483 | } |
2484 | ||
3b23dd6f | 2485 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
c08512c7 AS |
2486 | usb_mark_last_busy(udev); |
2487 | pm_runtime_put_sync_autosuspend(&udev->dev); | |
c066475e | 2488 | return err; |
1da177e4 LT |
2489 | |
2490 | fail: | |
2491 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
9bbdf1e0 AS |
2492 | pm_runtime_disable(&udev->dev); |
2493 | pm_runtime_set_suspended(&udev->dev); | |
d9d16e8a | 2494 | return err; |
1da177e4 LT |
2495 | } |
2496 | ||
93993a0a IPG |
2497 | |
2498 | /** | |
fd39c86b RD |
2499 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
2500 | * @usb_dev: USB device | |
2501 | * | |
2502 | * Move the USB device to a very basic state where interfaces are disabled | |
2503 | * and the device is in fact unconfigured and unusable. | |
93993a0a IPG |
2504 | * |
2505 | * We share a lock (that we have) with device_del(), so we need to | |
2506 | * defer its call. | |
626f090c YB |
2507 | * |
2508 | * Return: 0. | |
93993a0a IPG |
2509 | */ |
2510 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
2511 | { | |
93993a0a IPG |
2512 | usb_lock_device(usb_dev); |
2513 | if (usb_dev->authorized == 0) | |
2514 | goto out_unauthorized; | |
da307123 | 2515 | |
93993a0a IPG |
2516 | usb_dev->authorized = 0; |
2517 | usb_set_configuration(usb_dev, -1); | |
da307123 | 2518 | |
93993a0a IPG |
2519 | out_unauthorized: |
2520 | usb_unlock_device(usb_dev); | |
2521 | return 0; | |
2522 | } | |
2523 | ||
2524 | ||
2525 | int usb_authorize_device(struct usb_device *usb_dev) | |
2526 | { | |
2527 | int result = 0, c; | |
da307123 | 2528 | |
93993a0a IPG |
2529 | usb_lock_device(usb_dev); |
2530 | if (usb_dev->authorized == 1) | |
2531 | goto out_authorized; | |
da307123 | 2532 | |
93993a0a IPG |
2533 | result = usb_autoresume_device(usb_dev); |
2534 | if (result < 0) { | |
2535 | dev_err(&usb_dev->dev, | |
2536 | "can't autoresume for authorization: %d\n", result); | |
2537 | goto error_autoresume; | |
2538 | } | |
e50a322e JG |
2539 | |
2540 | if (usb_dev->wusb) { | |
2541 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
2542 | if (result < 0) { | |
2543 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
2544 | "authorization: %d\n", result); | |
2545 | goto error_device_descriptor; | |
2546 | } | |
93993a0a | 2547 | } |
da307123 | 2548 | |
93993a0a | 2549 | usb_dev->authorized = 1; |
93993a0a IPG |
2550 | /* Choose and set the configuration. This registers the interfaces |
2551 | * with the driver core and lets interface drivers bind to them. | |
2552 | */ | |
b5ea060f | 2553 | c = usb_choose_configuration(usb_dev); |
93993a0a IPG |
2554 | if (c >= 0) { |
2555 | result = usb_set_configuration(usb_dev, c); | |
2556 | if (result) { | |
2557 | dev_err(&usb_dev->dev, | |
2558 | "can't set config #%d, error %d\n", c, result); | |
2559 | /* This need not be fatal. The user can try to | |
2560 | * set other configurations. */ | |
2561 | } | |
2562 | } | |
2563 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
da307123 | 2564 | |
93993a0a | 2565 | error_device_descriptor: |
da307123 | 2566 | usb_autosuspend_device(usb_dev); |
93993a0a IPG |
2567 | error_autoresume: |
2568 | out_authorized: | |
781b2137 | 2569 | usb_unlock_device(usb_dev); /* complements locktree */ |
93993a0a IPG |
2570 | return result; |
2571 | } | |
2572 | ||
0cdd49a1 MN |
2573 | /* |
2574 | * Return 1 if port speed is SuperSpeedPlus, 0 otherwise | |
2575 | * check it from the link protocol field of the current speed ID attribute. | |
2576 | * current speed ID is got from ext port status request. Sublink speed attribute | |
2577 | * table is returned with the hub BOS SSP device capability descriptor | |
2578 | */ | |
2579 | static int port_speed_is_ssp(struct usb_device *hdev, int speed_id) | |
2580 | { | |
2581 | int ssa_count; | |
2582 | u32 ss_attr; | |
2583 | int i; | |
2584 | struct usb_ssp_cap_descriptor *ssp_cap = hdev->bos->ssp_cap; | |
2585 | ||
2586 | if (!ssp_cap) | |
2587 | return 0; | |
2588 | ||
2589 | ssa_count = le32_to_cpu(ssp_cap->bmAttributes) & | |
2590 | USB_SSP_SUBLINK_SPEED_ATTRIBS; | |
2591 | ||
2592 | for (i = 0; i <= ssa_count; i++) { | |
2593 | ss_attr = le32_to_cpu(ssp_cap->bmSublinkSpeedAttr[i]); | |
2594 | if (speed_id == (ss_attr & USB_SSP_SUBLINK_SPEED_SSID)) | |
2595 | return !!(ss_attr & USB_SSP_SUBLINK_SPEED_LP); | |
2596 | } | |
2597 | return 0; | |
2598 | } | |
93993a0a | 2599 | |
0165de09 IPG |
2600 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
2601 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
2602 | { | |
2603 | struct usb_hcd *hcd; | |
2604 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
2605 | return 0; | |
6ae706ae | 2606 | hcd = bus_to_hcd(hub->hdev->bus); |
0165de09 IPG |
2607 | return hcd->wireless; |
2608 | } | |
2609 | ||
2610 | ||
1da177e4 LT |
2611 | #define PORT_RESET_TRIES 5 |
2612 | #define SET_ADDRESS_TRIES 2 | |
2613 | #define GET_DESCRIPTOR_TRIES 2 | |
2614 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
90ab5ee9 | 2615 | #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) |
1da177e4 | 2616 | |
74072bae | 2617 | #define HUB_ROOT_RESET_TIME 60 /* times are in msec */ |
1da177e4 | 2618 | #define HUB_SHORT_RESET_TIME 10 |
75d7cf72 | 2619 | #define HUB_BH_RESET_TIME 50 |
1da177e4 | 2620 | #define HUB_LONG_RESET_TIME 200 |
77c7f072 | 2621 | #define HUB_RESET_TIMEOUT 800 |
1da177e4 | 2622 | |
48fc7dbd DW |
2623 | /* |
2624 | * "New scheme" enumeration causes an extra state transition to be | |
2625 | * exposed to an xhci host and causes USB3 devices to receive control | |
2626 | * commands in the default state. This has been seen to cause | |
2627 | * enumeration failures, so disable this enumeration scheme for USB3 | |
2628 | * devices. | |
2629 | */ | |
2630 | static bool use_new_scheme(struct usb_device *udev, int retry) | |
2631 | { | |
8a1b2725 | 2632 | if (udev->speed >= USB_SPEED_SUPER) |
48fc7dbd DW |
2633 | return false; |
2634 | ||
2635 | return USE_NEW_SCHEME(retry); | |
2636 | } | |
2637 | ||
025d4430 | 2638 | /* Is a USB 3.0 port in the Inactive or Compliance Mode state? |
8bea2bd3 SL |
2639 | * Port worm reset is required to recover |
2640 | */ | |
3cd12f91 DW |
2641 | static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, |
2642 | u16 portstatus) | |
10d674a8 | 2643 | { |
3cd12f91 DW |
2644 | u16 link_state; |
2645 | ||
2646 | if (!hub_is_superspeed(hub->hdev)) | |
2647 | return false; | |
2648 | ||
2649 | if (test_bit(port1, hub->warm_reset_bits)) | |
2650 | return true; | |
2651 | ||
2652 | link_state = portstatus & USB_PORT_STAT_LINK_STATE; | |
2653 | return link_state == USB_SS_PORT_LS_SS_INACTIVE | |
2654 | || link_state == USB_SS_PORT_LS_COMP_MOD; | |
10d674a8 SS |
2655 | } |
2656 | ||
1da177e4 | 2657 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2658 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2659 | { |
2660 | int delay_time, ret; | |
2661 | u16 portstatus; | |
2662 | u16 portchange; | |
0cdd49a1 | 2663 | u32 ext_portstatus = 0; |
1da177e4 LT |
2664 | |
2665 | for (delay_time = 0; | |
2666 | delay_time < HUB_RESET_TIMEOUT; | |
2667 | delay_time += delay) { | |
2668 | /* wait to give the device a chance to reset */ | |
2669 | msleep(delay); | |
2670 | ||
2671 | /* read and decode port status */ | |
0cdd49a1 MN |
2672 | if (hub_is_superspeedplus(hub->hdev)) |
2673 | ret = hub_ext_port_status(hub, port1, | |
2674 | HUB_EXT_PORT_STATUS, | |
2675 | &portstatus, &portchange, | |
2676 | &ext_portstatus); | |
2677 | else | |
2678 | ret = hub_port_status(hub, port1, &portstatus, | |
2679 | &portchange); | |
1da177e4 LT |
2680 | if (ret < 0) |
2681 | return ret; | |
2682 | ||
22547c4c GR |
2683 | /* |
2684 | * The port state is unknown until the reset completes. | |
2685 | * | |
2686 | * On top of that, some chips may require additional time | |
2687 | * to re-establish a connection after the reset is complete, | |
2688 | * so also wait for the connection to be re-established. | |
2689 | */ | |
2690 | if (!(portstatus & USB_PORT_STAT_RESET) && | |
2691 | (portstatus & USB_PORT_STAT_CONNECTION)) | |
470f0be8 | 2692 | break; |
1da177e4 LT |
2693 | |
2694 | /* switch to the long delay after two short delay failures */ | |
2695 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
2696 | delay = HUB_LONG_RESET_TIME; | |
2697 | ||
d99f6b41 DW |
2698 | dev_dbg(&hub->ports[port1 - 1]->dev, |
2699 | "not %sreset yet, waiting %dms\n", | |
2700 | warm ? "warm " : "", delay); | |
1da177e4 LT |
2701 | } |
2702 | ||
470f0be8 SS |
2703 | if ((portstatus & USB_PORT_STAT_RESET)) |
2704 | return -EBUSY; | |
2705 | ||
3cd12f91 | 2706 | if (hub_port_warm_reset_required(hub, port1, portstatus)) |
470f0be8 SS |
2707 | return -ENOTCONN; |
2708 | ||
2709 | /* Device went away? */ | |
2710 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
2711 | return -ENOTCONN; | |
2712 | ||
1ac7db63 MN |
2713 | /* Retry if connect change is set but status is still connected. |
2714 | * A USB 3.0 connection may bounce if multiple warm resets were issued, | |
470f0be8 SS |
2715 | * but the device may have successfully re-connected. Ignore it. |
2716 | */ | |
2717 | if (!hub_is_superspeed(hub->hdev) && | |
1ac7db63 MN |
2718 | (portchange & USB_PORT_STAT_C_CONNECTION)) { |
2719 | usb_clear_port_feature(hub->hdev, port1, | |
2720 | USB_PORT_FEAT_C_CONNECTION); | |
2721 | return -EAGAIN; | |
2722 | } | |
470f0be8 SS |
2723 | |
2724 | if (!(portstatus & USB_PORT_STAT_ENABLE)) | |
2725 | return -EBUSY; | |
2726 | ||
2727 | if (!udev) | |
2728 | return 0; | |
2729 | ||
2730 | if (hub_is_wusb(hub)) | |
2731 | udev->speed = USB_SPEED_WIRELESS; | |
0cdd49a1 MN |
2732 | else if (hub_is_superspeedplus(hub->hdev) && |
2733 | port_speed_is_ssp(hub->hdev, ext_portstatus & | |
2734 | USB_EXT_PORT_STAT_RX_SPEED_ID)) | |
2735 | udev->speed = USB_SPEED_SUPER_PLUS; | |
470f0be8 SS |
2736 | else if (hub_is_superspeed(hub->hdev)) |
2737 | udev->speed = USB_SPEED_SUPER; | |
2738 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
2739 | udev->speed = USB_SPEED_HIGH; | |
2740 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
2741 | udev->speed = USB_SPEED_LOW; | |
2742 | else | |
2743 | udev->speed = USB_SPEED_FULL; | |
2744 | return 0; | |
1da177e4 LT |
2745 | } |
2746 | ||
75d7cf72 | 2747 | /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ |
1da177e4 | 2748 | static int hub_port_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2749 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2750 | { |
2751 | int i, status; | |
a24a6078 | 2752 | u16 portchange, portstatus; |
d99f6b41 | 2753 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
1da177e4 | 2754 | |
0fe51aa5 SS |
2755 | if (!hub_is_superspeed(hub->hdev)) { |
2756 | if (warm) { | |
75d7cf72 AX |
2757 | dev_err(hub->intfdev, "only USB3 hub support " |
2758 | "warm reset\n"); | |
2759 | return -EINVAL; | |
2760 | } | |
0fe51aa5 SS |
2761 | /* Block EHCI CF initialization during the port reset. |
2762 | * Some companion controllers don't like it when they mix. | |
2763 | */ | |
2764 | down_read(&ehci_cf_port_reset_rwsem); | |
d3b9d7a9 SS |
2765 | } else if (!warm) { |
2766 | /* | |
2767 | * If the caller hasn't explicitly requested a warm reset, | |
2768 | * double check and see if one is needed. | |
2769 | */ | |
fb6d1f7d RS |
2770 | if (hub_port_status(hub, port1, &portstatus, &portchange) == 0) |
2771 | if (hub_port_warm_reset_required(hub, port1, | |
2772 | portstatus)) | |
2773 | warm = true; | |
75d7cf72 | 2774 | } |
3cd12f91 | 2775 | clear_bit(port1, hub->warm_reset_bits); |
32fe0198 | 2776 | |
1da177e4 LT |
2777 | /* Reset the port */ |
2778 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
75d7cf72 AX |
2779 | status = set_port_feature(hub->hdev, port1, (warm ? |
2780 | USB_PORT_FEAT_BH_PORT_RESET : | |
2781 | USB_PORT_FEAT_RESET)); | |
e9e88fb7 AS |
2782 | if (status == -ENODEV) { |
2783 | ; /* The hub is gone */ | |
2784 | } else if (status) { | |
d99f6b41 DW |
2785 | dev_err(&port_dev->dev, |
2786 | "cannot %sreset (err = %d)\n", | |
2787 | warm ? "warm " : "", status); | |
75d7cf72 AX |
2788 | } else { |
2789 | status = hub_port_wait_reset(hub, port1, udev, delay, | |
2790 | warm); | |
e9e88fb7 | 2791 | if (status && status != -ENOTCONN && status != -ENODEV) |
1da177e4 LT |
2792 | dev_dbg(hub->intfdev, |
2793 | "port_wait_reset: err = %d\n", | |
2794 | status); | |
2795 | } | |
2796 | ||
a24a6078 | 2797 | /* Check for disconnect or reset */ |
75d7cf72 | 2798 | if (status == 0 || status == -ENOTCONN || status == -ENODEV) { |
fb6d1f7d RS |
2799 | usb_clear_port_feature(hub->hdev, port1, |
2800 | USB_PORT_FEAT_C_RESET); | |
a24a6078 SS |
2801 | |
2802 | if (!hub_is_superspeed(hub->hdev)) | |
2803 | goto done; | |
2804 | ||
fb6d1f7d RS |
2805 | usb_clear_port_feature(hub->hdev, port1, |
2806 | USB_PORT_FEAT_C_BH_PORT_RESET); | |
2807 | usb_clear_port_feature(hub->hdev, port1, | |
2808 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
2809 | usb_clear_port_feature(hub->hdev, port1, | |
2810 | USB_PORT_FEAT_C_CONNECTION); | |
2811 | ||
a24a6078 SS |
2812 | /* |
2813 | * If a USB 3.0 device migrates from reset to an error | |
2814 | * state, re-issue the warm reset. | |
2815 | */ | |
2816 | if (hub_port_status(hub, port1, | |
2817 | &portstatus, &portchange) < 0) | |
2818 | goto done; | |
2819 | ||
3cd12f91 DW |
2820 | if (!hub_port_warm_reset_required(hub, port1, |
2821 | portstatus)) | |
a24a6078 SS |
2822 | goto done; |
2823 | ||
2824 | /* | |
2825 | * If the port is in SS.Inactive or Compliance Mode, the | |
2826 | * hot or warm reset failed. Try another warm reset. | |
2827 | */ | |
2828 | if (!warm) { | |
d99f6b41 DW |
2829 | dev_dbg(&port_dev->dev, |
2830 | "hot reset failed, warm reset\n"); | |
a24a6078 SS |
2831 | warm = true; |
2832 | } | |
1da177e4 LT |
2833 | } |
2834 | ||
d99f6b41 DW |
2835 | dev_dbg(&port_dev->dev, |
2836 | "not enabled, trying %sreset again...\n", | |
2837 | warm ? "warm " : ""); | |
1da177e4 LT |
2838 | delay = HUB_LONG_RESET_TIME; |
2839 | } | |
2840 | ||
d99f6b41 | 2841 | dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n"); |
1da177e4 | 2842 | |
75d7cf72 | 2843 | done: |
fb6d1f7d RS |
2844 | if (status == 0) { |
2845 | /* TRSTRCY = 10 ms; plus some extra */ | |
2846 | msleep(10 + 40); | |
2847 | if (udev) { | |
2848 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2849 | ||
2850 | update_devnum(udev, 0); | |
2851 | /* The xHC may think the device is already reset, | |
2852 | * so ignore the status. | |
2853 | */ | |
2854 | if (hcd->driver->reset_device) | |
2855 | hcd->driver->reset_device(hcd, udev); | |
2856 | ||
2857 | usb_set_device_state(udev, USB_STATE_DEFAULT); | |
2858 | } | |
2859 | } else { | |
2860 | if (udev) | |
2861 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
2862 | } | |
2863 | ||
0fe51aa5 | 2864 | if (!hub_is_superspeed(hub->hdev)) |
75d7cf72 | 2865 | up_read(&ehci_cf_port_reset_rwsem); |
5e467f6e | 2866 | |
75d7cf72 | 2867 | return status; |
5e467f6e AX |
2868 | } |
2869 | ||
0ed9a57e AX |
2870 | /* Check if a port is power on */ |
2871 | static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) | |
2872 | { | |
2873 | int ret = 0; | |
2874 | ||
2875 | if (hub_is_superspeed(hub->hdev)) { | |
2876 | if (portstatus & USB_SS_PORT_STAT_POWER) | |
2877 | ret = 1; | |
2878 | } else { | |
2879 | if (portstatus & USB_PORT_STAT_POWER) | |
2880 | ret = 1; | |
2881 | } | |
2882 | ||
2883 | return ret; | |
2884 | } | |
2885 | ||
5c79a1e3 DW |
2886 | static void usb_lock_port(struct usb_port *port_dev) |
2887 | __acquires(&port_dev->status_lock) | |
2888 | { | |
2889 | mutex_lock(&port_dev->status_lock); | |
2890 | __acquire(&port_dev->status_lock); | |
2891 | } | |
2892 | ||
2893 | static void usb_unlock_port(struct usb_port *port_dev) | |
2894 | __releases(&port_dev->status_lock) | |
2895 | { | |
2896 | mutex_unlock(&port_dev->status_lock); | |
2897 | __release(&port_dev->status_lock); | |
2898 | } | |
2899 | ||
d388dab7 | 2900 | #ifdef CONFIG_PM |
1da177e4 | 2901 | |
0ed9a57e AX |
2902 | /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ |
2903 | static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) | |
2904 | { | |
2905 | int ret = 0; | |
2906 | ||
2907 | if (hub_is_superspeed(hub->hdev)) { | |
2908 | if ((portstatus & USB_PORT_STAT_LINK_STATE) | |
2909 | == USB_SS_PORT_LS_U3) | |
2910 | ret = 1; | |
2911 | } else { | |
2912 | if (portstatus & USB_PORT_STAT_SUSPEND) | |
2913 | ret = 1; | |
2914 | } | |
2915 | ||
2916 | return ret; | |
2917 | } | |
b01b03f3 AS |
2918 | |
2919 | /* Determine whether the device on a port is ready for a normal resume, | |
2920 | * is ready for a reset-resume, or should be disconnected. | |
2921 | */ | |
2922 | static int check_port_resume_type(struct usb_device *udev, | |
2923 | struct usb_hub *hub, int port1, | |
7fa40910 | 2924 | int status, u16 portchange, u16 portstatus) |
b01b03f3 | 2925 | { |
d99f6b41 | 2926 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
7fa40910 | 2927 | int retries = 3; |
d99f6b41 | 2928 | |
7fa40910 | 2929 | retry: |
3cd12f91 DW |
2930 | /* Is a warm reset needed to recover the connection? */ |
2931 | if (status == 0 && udev->reset_resume | |
2932 | && hub_port_warm_reset_required(hub, port1, portstatus)) { | |
2933 | /* pass */; | |
2934 | } | |
b01b03f3 | 2935 | /* Is the device still present? */ |
3cd12f91 | 2936 | else if (status || port_is_suspended(hub, portstatus) || |
7fa40910 | 2937 | !port_is_power_on(hub, portstatus)) { |
b01b03f3 AS |
2938 | if (status >= 0) |
2939 | status = -ENODEV; | |
7fa40910 JW |
2940 | } else if (!(portstatus & USB_PORT_STAT_CONNECTION)) { |
2941 | if (retries--) { | |
2942 | usleep_range(200, 300); | |
2943 | status = hub_port_status(hub, port1, &portstatus, | |
2944 | &portchange); | |
2945 | goto retry; | |
2946 | } | |
2947 | status = -ENODEV; | |
b01b03f3 AS |
2948 | } |
2949 | ||
86c57edf AS |
2950 | /* Can't do a normal resume if the port isn't enabled, |
2951 | * so try a reset-resume instead. | |
2952 | */ | |
2953 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { | |
2954 | if (udev->persist_enabled) | |
2955 | udev->reset_resume = 1; | |
2956 | else | |
2957 | status = -ENODEV; | |
2958 | } | |
b01b03f3 AS |
2959 | |
2960 | if (status) { | |
d99f6b41 DW |
2961 | dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n", |
2962 | portchange, portstatus, status); | |
b01b03f3 AS |
2963 | } else if (udev->reset_resume) { |
2964 | ||
2965 | /* Late port handoff can set status-change bits */ | |
2966 | if (portchange & USB_PORT_STAT_C_CONNECTION) | |
ad493e5e | 2967 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
2968 | USB_PORT_FEAT_C_CONNECTION); |
2969 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
ad493e5e | 2970 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
2971 | USB_PORT_FEAT_C_ENABLE); |
2972 | } | |
2973 | ||
2974 | return status; | |
2975 | } | |
2976 | ||
f74631e3 SS |
2977 | int usb_disable_ltm(struct usb_device *udev) |
2978 | { | |
2979 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2980 | ||
2981 | /* Check if the roothub and device supports LTM. */ | |
2982 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
2983 | !usb_device_supports_ltm(udev)) | |
2984 | return 0; | |
2985 | ||
2986 | /* Clear Feature LTM Enable can only be sent if the device is | |
2987 | * configured. | |
2988 | */ | |
2989 | if (!udev->actconfig) | |
2990 | return 0; | |
2991 | ||
2992 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2993 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
2994 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
2995 | USB_CTRL_SET_TIMEOUT); | |
2996 | } | |
2997 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
2998 | ||
2999 | void usb_enable_ltm(struct usb_device *udev) | |
3000 | { | |
3001 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
3002 | ||
3003 | /* Check if the roothub and device supports LTM. */ | |
3004 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
3005 | !usb_device_supports_ltm(udev)) | |
3006 | return; | |
3007 | ||
3008 | /* Set Feature LTM Enable can only be sent if the device is | |
3009 | * configured. | |
3010 | */ | |
3011 | if (!udev->actconfig) | |
3012 | return; | |
3013 | ||
3014 | usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3015 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
3016 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
3017 | USB_CTRL_SET_TIMEOUT); | |
3018 | } | |
3019 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
3020 | ||
54a3ac0c | 3021 | /* |
28e86165 | 3022 | * usb_enable_remote_wakeup - enable remote wakeup for a device |
54a3ac0c LT |
3023 | * @udev: target device |
3024 | * | |
28e86165 AS |
3025 | * For USB-2 devices: Set the device's remote wakeup feature. |
3026 | * | |
3027 | * For USB-3 devices: Assume there's only one function on the device and | |
3028 | * enable remote wake for the first interface. FIXME if the interface | |
3029 | * association descriptor shows there's more than one function. | |
54a3ac0c | 3030 | */ |
28e86165 | 3031 | static int usb_enable_remote_wakeup(struct usb_device *udev) |
54a3ac0c | 3032 | { |
28e86165 AS |
3033 | if (udev->speed < USB_SPEED_SUPER) |
3034 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3035 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
3036 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, | |
3037 | USB_CTRL_SET_TIMEOUT); | |
3038 | else | |
3039 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3040 | USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, | |
3041 | USB_INTRF_FUNC_SUSPEND, | |
3042 | USB_INTRF_FUNC_SUSPEND_RW | | |
3043 | USB_INTRF_FUNC_SUSPEND_LP, | |
3044 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3045 | } | |
3046 | ||
3047 | /* | |
3048 | * usb_disable_remote_wakeup - disable remote wakeup for a device | |
3049 | * @udev: target device | |
3050 | * | |
3051 | * For USB-2 devices: Clear the device's remote wakeup feature. | |
3052 | * | |
3053 | * For USB-3 devices: Assume there's only one function on the device and | |
3054 | * disable remote wake for the first interface. FIXME if the interface | |
3055 | * association descriptor shows there's more than one function. | |
3056 | */ | |
3057 | static int usb_disable_remote_wakeup(struct usb_device *udev) | |
3058 | { | |
3059 | if (udev->speed < USB_SPEED_SUPER) | |
3060 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3061 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
3062 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, | |
3063 | USB_CTRL_SET_TIMEOUT); | |
3064 | else | |
3065 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
4e248000 | 3066 | USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, |
54a3ac0c LT |
3067 | USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, |
3068 | USB_CTRL_SET_TIMEOUT); | |
3069 | } | |
1da177e4 | 3070 | |
e583d9db AS |
3071 | /* Count of wakeup-enabled devices at or below udev */ |
3072 | static unsigned wakeup_enabled_descendants(struct usb_device *udev) | |
3073 | { | |
3074 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); | |
3075 | ||
3076 | return udev->do_remote_wakeup + | |
3077 | (hub ? hub->wakeup_enabled_descendants : 0); | |
3078 | } | |
3079 | ||
1da177e4 | 3080 | /* |
624d6c07 AS |
3081 | * usb_port_suspend - suspend a usb device's upstream port |
3082 | * @udev: device that's no longer in active use, not a root hub | |
3083 | * Context: must be able to sleep; device not locked; pm locks held | |
3084 | * | |
3085 | * Suspends a USB device that isn't in active use, conserving power. | |
3086 | * Devices may wake out of a suspend, if anything important happens, | |
3087 | * using the remote wakeup mechanism. They may also be taken out of | |
3088 | * suspend by the host, using usb_port_resume(). It's also routine | |
3089 | * to disconnect devices while they are suspended. | |
3090 | * | |
3091 | * This only affects the USB hardware for a device; its interfaces | |
3092 | * (and, for hubs, child devices) must already have been suspended. | |
3093 | * | |
1da177e4 LT |
3094 | * Selective port suspend reduces power; most suspended devices draw |
3095 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
3096 | * All devices below the suspended port are also suspended. | |
3097 | * | |
3098 | * Devices leave suspend state when the host wakes them up. Some devices | |
3099 | * also support "remote wakeup", where the device can activate the USB | |
3100 | * tree above them to deliver data, such as a keypress or packet. In | |
3101 | * some cases, this wakes the USB host. | |
624d6c07 AS |
3102 | * |
3103 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
3104 | * between a pair of dual-role devices. That will change roles, such | |
3105 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
3106 | * | |
3107 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
3108 | * to ACPI D2, "may cause the device to lose some context". | |
3109 | * State transitions include: | |
3110 | * | |
3111 | * - suspend, resume ... when the VBUS power link stays live | |
3112 | * - suspend, disconnect ... VBUS lost | |
3113 | * | |
3114 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
3115 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
3116 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
37ebb549 | 3117 | * Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq |
624d6c07 AS |
3118 | * timer, no SRP, no requests through sysfs. |
3119 | * | |
e583d9db AS |
3120 | * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get |
3121 | * suspended until their bus goes into global suspend (i.e., the root | |
0aa2832d AS |
3122 | * hub is suspended). Nevertheless, we change @udev->state to |
3123 | * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual | |
3124 | * upstream port setting is stored in @udev->port_is_suspended. | |
624d6c07 AS |
3125 | * |
3126 | * Returns 0 on success, else negative errno. | |
1da177e4 | 3127 | */ |
65bfd296 | 3128 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 3129 | { |
ad493e5e LT |
3130 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
3131 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
3132 | int port1 = udev->portnum; |
3133 | int status; | |
0aa2832d | 3134 | bool really_suspend = true; |
1da177e4 | 3135 | |
5c79a1e3 DW |
3136 | usb_lock_port(port_dev); |
3137 | ||
1da177e4 LT |
3138 | /* enable remote wakeup when appropriate; this lets the device |
3139 | * wake up the upstream hub (including maybe the root hub). | |
3140 | * | |
3141 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
3142 | * we don't explicitly enable it here. | |
3143 | */ | |
645daaab | 3144 | if (udev->do_remote_wakeup) { |
28e86165 | 3145 | status = usb_enable_remote_wakeup(udev); |
0c487206 | 3146 | if (status) { |
624d6c07 AS |
3147 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
3148 | status); | |
0c487206 | 3149 | /* bail if autosuspend is requested */ |
5b1b0b81 | 3150 | if (PMSG_IS_AUTO(msg)) |
4fae6f0f | 3151 | goto err_wakeup; |
0c487206 | 3152 | } |
1da177e4 LT |
3153 | } |
3154 | ||
65580b43 AX |
3155 | /* disable USB2 hardware LPM */ |
3156 | if (udev->usb2_hw_lpm_enabled == 1) | |
3157 | usb_set_usb2_hardware_lpm(udev, 0); | |
3158 | ||
f74631e3 | 3159 | if (usb_disable_ltm(udev)) { |
4fae6f0f AS |
3160 | dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); |
3161 | status = -ENOMEM; | |
3162 | if (PMSG_IS_AUTO(msg)) | |
3163 | goto err_ltm; | |
f74631e3 | 3164 | } |
8306095f | 3165 | |
1da177e4 | 3166 | /* see 7.1.7.6 */ |
a7114230 | 3167 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 3168 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); |
e583d9db | 3169 | |
0aa2832d AS |
3170 | /* |
3171 | * For system suspend, we do not need to enable the suspend feature | |
3172 | * on individual USB-2 ports. The devices will automatically go | |
3173 | * into suspend a few ms after the root hub stops sending packets. | |
3174 | * The USB 2.0 spec calls this "global suspend". | |
e583d9db AS |
3175 | * |
3176 | * However, many USB hubs have a bug: They don't relay wakeup requests | |
3177 | * from a downstream port if the port's suspend feature isn't on. | |
3178 | * Therefore we will turn on the suspend feature if udev or any of its | |
3179 | * descendants is enabled for remote wakeup. | |
0aa2832d | 3180 | */ |
e583d9db AS |
3181 | else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) |
3182 | status = set_port_feature(hub->hdev, port1, | |
3183 | USB_PORT_FEAT_SUSPEND); | |
0aa2832d AS |
3184 | else { |
3185 | really_suspend = false; | |
3186 | status = 0; | |
3187 | } | |
1da177e4 | 3188 | if (status) { |
d99f6b41 | 3189 | dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status); |
cbb33004 | 3190 | |
d590c231 | 3191 | /* Try to enable USB3 LTM again */ |
4fae6f0f AS |
3192 | usb_enable_ltm(udev); |
3193 | err_ltm: | |
c3e751e4 AX |
3194 | /* Try to enable USB2 hardware LPM again */ |
3195 | if (udev->usb2_hw_lpm_capable == 1) | |
3196 | usb_set_usb2_hardware_lpm(udev, 1); | |
3197 | ||
4fae6f0f AS |
3198 | if (udev->do_remote_wakeup) |
3199 | (void) usb_disable_remote_wakeup(udev); | |
3200 | err_wakeup: | |
8306095f | 3201 | |
cbb33004 | 3202 | /* System sleep transitions should never fail */ |
5b1b0b81 | 3203 | if (!PMSG_IS_AUTO(msg)) |
cbb33004 | 3204 | status = 0; |
1da177e4 | 3205 | } else { |
30b1a7a3 AS |
3206 | dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", |
3207 | (PMSG_IS_AUTO(msg) ? "auto-" : ""), | |
3208 | udev->do_remote_wakeup); | |
0aa2832d AS |
3209 | if (really_suspend) { |
3210 | udev->port_is_suspended = 1; | |
e583d9db AS |
3211 | |
3212 | /* device has up to 10 msec to fully suspend */ | |
0aa2832d AS |
3213 | msleep(10); |
3214 | } | |
e583d9db | 3215 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
1da177e4 | 3216 | } |
ad493e5e | 3217 | |
d5c3834e DW |
3218 | if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled |
3219 | && test_and_clear_bit(port1, hub->child_usage_bits)) | |
98a4f1ff | 3220 | pm_runtime_put_sync(&port_dev->dev); |
ad493e5e | 3221 | |
c08512c7 | 3222 | usb_mark_last_busy(hub->hdev); |
5c79a1e3 DW |
3223 | |
3224 | usb_unlock_port(port_dev); | |
1da177e4 LT |
3225 | return status; |
3226 | } | |
3227 | ||
1da177e4 | 3228 | /* |
390a8c34 DB |
3229 | * If the USB "suspend" state is in use (rather than "global suspend"), |
3230 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 3231 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
3232 | * hardware resume signaling is finished, either because of selective |
3233 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
3234 | * in the tree that's rooted at this device. | |
54515fe5 AS |
3235 | * |
3236 | * If @udev->reset_resume is set then the device is reset before the | |
3237 | * status check is done. | |
1da177e4 | 3238 | */ |
140d8f68 | 3239 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 3240 | { |
54515fe5 | 3241 | int status = 0; |
07e72b95 | 3242 | u16 devstatus = 0; |
1da177e4 LT |
3243 | |
3244 | /* caller owns the udev device lock */ | |
b9cef6c3 WF |
3245 | dev_dbg(&udev->dev, "%s\n", |
3246 | udev->reset_resume ? "finish reset-resume" : "finish resume"); | |
1da177e4 LT |
3247 | |
3248 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
3249 | * state the device resumes to. Linux currently won't see the | |
3250 | * first two on the host side; they'd be inside hub_port_init() | |
37ebb549 | 3251 | * during many timeouts, but hub_wq can't suspend until later. |
1da177e4 LT |
3252 | */ |
3253 | usb_set_device_state(udev, udev->actconfig | |
3254 | ? USB_STATE_CONFIGURED | |
3255 | : USB_STATE_ADDRESS); | |
1da177e4 | 3256 | |
54515fe5 AS |
3257 | /* 10.5.4.5 says not to reset a suspended port if the attached |
3258 | * device is enabled for remote wakeup. Hence the reset | |
3259 | * operation is carried out here, after the port has been | |
3260 | * resumed. | |
3261 | */ | |
1d10255c AS |
3262 | if (udev->reset_resume) { |
3263 | /* | |
3264 | * If the device morphs or switches modes when it is reset, | |
3265 | * we don't want to perform a reset-resume. We'll fail the | |
3266 | * resume, which will cause a logical disconnect, and then | |
3267 | * the device will be rediscovered. | |
3268 | */ | |
86c57edf | 3269 | retry_reset_resume: |
1d10255c AS |
3270 | if (udev->quirks & USB_QUIRK_RESET) |
3271 | status = -ENODEV; | |
3272 | else | |
3273 | status = usb_reset_and_verify_device(udev); | |
3274 | } | |
54515fe5 | 3275 | |
469271f8 MB |
3276 | /* 10.5.4.5 says be sure devices in the tree are still there. |
3277 | * For now let's assume the device didn't go crazy on resume, | |
1da177e4 LT |
3278 | * and device drivers will know about any resume quirks. |
3279 | */ | |
54515fe5 | 3280 | if (status == 0) { |
46dede46 | 3281 | devstatus = 0; |
d9e1e148 | 3282 | status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
86c57edf AS |
3283 | |
3284 | /* If a normal resume failed, try doing a reset-resume */ | |
3285 | if (status && !udev->reset_resume && udev->persist_enabled) { | |
3286 | dev_dbg(&udev->dev, "retry with reset-resume\n"); | |
3287 | udev->reset_resume = 1; | |
3288 | goto retry_reset_resume; | |
3289 | } | |
54515fe5 | 3290 | } |
b40b7a90 | 3291 | |
624d6c07 AS |
3292 | if (status) { |
3293 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
3294 | status); | |
07e72b95 ON |
3295 | /* |
3296 | * There are a few quirky devices which violate the standard | |
3297 | * by claiming to have remote wakeup enabled after a reset, | |
3298 | * which crash if the feature is cleared, hence check for | |
3299 | * udev->reset_resume | |
3300 | */ | |
3301 | } else if (udev->actconfig && !udev->reset_resume) { | |
28e86165 | 3302 | if (udev->speed < USB_SPEED_SUPER) { |
54a3ac0c | 3303 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) |
28e86165 | 3304 | status = usb_disable_remote_wakeup(udev); |
54a3ac0c | 3305 | } else { |
d9e1e148 | 3306 | status = usb_get_std_status(udev, USB_RECIP_INTERFACE, 0, |
54a3ac0c | 3307 | &devstatus); |
54a3ac0c LT |
3308 | if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP |
3309 | | USB_INTRF_STAT_FUNC_RW)) | |
28e86165 | 3310 | status = usb_disable_remote_wakeup(udev); |
4bf0ba86 | 3311 | } |
54a3ac0c LT |
3312 | |
3313 | if (status) | |
3314 | dev_dbg(&udev->dev, | |
3315 | "disable remote wakeup, status %d\n", | |
3316 | status); | |
1da177e4 | 3317 | status = 0; |
1da177e4 LT |
3318 | } |
3319 | return status; | |
3320 | } | |
3321 | ||
a40178b2 PA |
3322 | /* |
3323 | * There are some SS USB devices which take longer time for link training. | |
3324 | * XHCI specs 4.19.4 says that when Link training is successful, port | |
6b82b122 | 3325 | * sets CCS bit to 1. So if SW reads port status before successful link |
a40178b2 PA |
3326 | * training, then it will not find device to be present. |
3327 | * USB Analyzer log with such buggy devices show that in some cases | |
3328 | * device switch on the RX termination after long delay of host enabling | |
3329 | * the VBUS. In few other cases it has been seen that device fails to | |
3330 | * negotiate link training in first attempt. It has been | |
3331 | * reported till now that few devices take as long as 2000 ms to train | |
3332 | * the link after host enabling its VBUS and termination. Following | |
3333 | * routine implements a 2000 ms timeout for link training. If in a case | |
3334 | * link trains before timeout, loop will exit earlier. | |
3335 | * | |
6b82b122 AC |
3336 | * There are also some 2.0 hard drive based devices and 3.0 thumb |
3337 | * drives that, when plugged into a 2.0 only port, take a long | |
3338 | * time to set CCS after VBUS enable. | |
3339 | * | |
a40178b2 PA |
3340 | * FIXME: If a device was connected before suspend, but was removed |
3341 | * while system was asleep, then the loop in the following routine will | |
3342 | * only exit at timeout. | |
3343 | * | |
6b82b122 | 3344 | * This routine should only be called when persist is enabled. |
a40178b2 | 3345 | */ |
6b82b122 | 3346 | static int wait_for_connected(struct usb_device *udev, |
a40178b2 PA |
3347 | struct usb_hub *hub, int *port1, |
3348 | u16 *portchange, u16 *portstatus) | |
3349 | { | |
3350 | int status = 0, delay_ms = 0; | |
3351 | ||
3352 | while (delay_ms < 2000) { | |
3353 | if (status || *portstatus & USB_PORT_STAT_CONNECTION) | |
3354 | break; | |
3355 | msleep(20); | |
3356 | delay_ms += 20; | |
3357 | status = hub_port_status(hub, *port1, portstatus, portchange); | |
3358 | } | |
6b82b122 | 3359 | dev_dbg(&udev->dev, "Waited %dms for CONNECT\n", delay_ms); |
a40178b2 PA |
3360 | return status; |
3361 | } | |
3362 | ||
624d6c07 AS |
3363 | /* |
3364 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
3365 | * @udev: device to re-activate, not a root hub | |
3366 | * Context: must be able to sleep; device not locked; pm locks held | |
3367 | * | |
3368 | * This will re-activate the suspended device, increasing power usage | |
3369 | * while letting drivers communicate again with its endpoints. | |
3370 | * USB resume explicitly guarantees that the power session between | |
3371 | * the host and the device is the same as it was when the device | |
3372 | * suspended. | |
3373 | * | |
feccc30d AS |
3374 | * If @udev->reset_resume is set then this routine won't check that the |
3375 | * port is still enabled. Furthermore, finish_port_resume() above will | |
54515fe5 AS |
3376 | * reset @udev. The end result is that a broken power session can be |
3377 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
3378 | * | |
3379 | * For example, if a host controller doesn't maintain VBUS suspend current | |
3380 | * during a system sleep or is reset when the system wakes up, all the USB | |
3381 | * power sessions below it will be broken. This is especially troublesome | |
3382 | * for mass-storage devices containing mounted filesystems, since the | |
3383 | * device will appear to have disconnected and all the memory mappings | |
3384 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
3385 | * made to appear as if it had not disconnected. | |
3386 | * | |
742120c6 | 3387 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
feccc30d | 3388 | * every effort to insure that the same device is present after the |
54515fe5 AS |
3389 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
3390 | * quite possible for a device to remain unaltered but its media to be | |
3391 | * changed. If the user replaces a flash memory card while the system is | |
3392 | * asleep, he will have only himself to blame when the filesystem on the | |
3393 | * new card is corrupted and the system crashes. | |
3394 | * | |
624d6c07 AS |
3395 | * Returns 0 on success, else negative errno. |
3396 | */ | |
65bfd296 | 3397 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 3398 | { |
ad493e5e LT |
3399 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
3400 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
3401 | int port1 = udev->portnum; |
3402 | int status; | |
3403 | u16 portchange, portstatus; | |
d25450c6 | 3404 | |
d5c3834e | 3405 | if (!test_and_set_bit(port1, hub->child_usage_bits)) { |
ad493e5e | 3406 | status = pm_runtime_get_sync(&port_dev->dev); |
ad493e5e LT |
3407 | if (status < 0) { |
3408 | dev_dbg(&udev->dev, "can't resume usb port, status %d\n", | |
3409 | status); | |
3410 | return status; | |
3411 | } | |
3412 | } | |
3413 | ||
5c79a1e3 DW |
3414 | usb_lock_port(port_dev); |
3415 | ||
d25450c6 AS |
3416 | /* Skip the initial Clear-Suspend step for a remote wakeup */ |
3417 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
0ed9a57e | 3418 | if (status == 0 && !port_is_suspended(hub, portstatus)) |
d25450c6 | 3419 | goto SuspendCleared; |
1da177e4 | 3420 | |
1da177e4 | 3421 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
a7114230 | 3422 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 3423 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); |
a7114230 | 3424 | else |
ad493e5e | 3425 | status = usb_clear_port_feature(hub->hdev, |
a7114230 | 3426 | port1, USB_PORT_FEAT_SUSPEND); |
1da177e4 | 3427 | if (status) { |
d99f6b41 | 3428 | dev_dbg(&port_dev->dev, "can't resume, status %d\n", status); |
1da177e4 | 3429 | } else { |
bbc78c07 | 3430 | /* drive resume for USB_RESUME_TIMEOUT msec */ |
686314cf | 3431 | dev_dbg(&udev->dev, "usb %sresume\n", |
5b1b0b81 | 3432 | (PMSG_IS_AUTO(msg) ? "auto-" : "")); |
bbc78c07 | 3433 | msleep(USB_RESUME_TIMEOUT); |
1da177e4 | 3434 | |
1da177e4 LT |
3435 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
3436 | * stop resume signaling. Then finish the resume | |
3437 | * sequence. | |
3438 | */ | |
d25450c6 | 3439 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 | 3440 | |
b01b03f3 AS |
3441 | /* TRSMRCY = 10 msec */ |
3442 | msleep(10); | |
3443 | } | |
3444 | ||
54515fe5 | 3445 | SuspendCleared: |
b01b03f3 | 3446 | if (status == 0) { |
bfd1e910 | 3447 | udev->port_is_suspended = 0; |
a7114230 AX |
3448 | if (hub_is_superspeed(hub->hdev)) { |
3449 | if (portchange & USB_PORT_STAT_C_LINK_STATE) | |
ad493e5e | 3450 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3451 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
3452 | } else { | |
3453 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
ad493e5e | 3454 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3455 | USB_PORT_FEAT_C_SUSPEND); |
3456 | } | |
1da177e4 | 3457 | } |
1da177e4 | 3458 | |
6b82b122 AC |
3459 | if (udev->persist_enabled) |
3460 | status = wait_for_connected(udev, hub, &port1, &portchange, | |
a40178b2 PA |
3461 | &portstatus); |
3462 | ||
b01b03f3 AS |
3463 | status = check_port_resume_type(udev, |
3464 | hub, port1, status, portchange, portstatus); | |
54515fe5 AS |
3465 | if (status == 0) |
3466 | status = finish_port_resume(udev); | |
3467 | if (status < 0) { | |
3468 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
3469 | hub_port_logical_disconnect(hub, port1); | |
65580b43 AX |
3470 | } else { |
3471 | /* Try to enable USB2 hardware LPM */ | |
3472 | if (udev->usb2_hw_lpm_capable == 1) | |
3473 | usb_set_usb2_hardware_lpm(udev, 1); | |
8306095f | 3474 | |
d590c231 | 3475 | /* Try to enable USB3 LTM */ |
f74631e3 | 3476 | usb_enable_ltm(udev); |
54515fe5 | 3477 | } |
65580b43 | 3478 | |
5c79a1e3 DW |
3479 | usb_unlock_port(port_dev); |
3480 | ||
1da177e4 LT |
3481 | return status; |
3482 | } | |
3483 | ||
0534d468 | 3484 | int usb_remote_wakeup(struct usb_device *udev) |
1da177e4 LT |
3485 | { |
3486 | int status = 0; | |
3487 | ||
5c79a1e3 | 3488 | usb_lock_device(udev); |
1da177e4 | 3489 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 3490 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
9bbdf1e0 AS |
3491 | status = usb_autoresume_device(udev); |
3492 | if (status == 0) { | |
3493 | /* Let the drivers do their thing, then... */ | |
3494 | usb_autosuspend_device(udev); | |
3495 | } | |
1da177e4 | 3496 | } |
5c79a1e3 | 3497 | usb_unlock_device(udev); |
1da177e4 LT |
3498 | return status; |
3499 | } | |
3500 | ||
7e73be22 DW |
3501 | /* Returns 1 if there was a remote wakeup and a connect status change. */ |
3502 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, | |
3503 | u16 portstatus, u16 portchange) | |
3504 | __must_hold(&port_dev->status_lock) | |
3505 | { | |
3506 | struct usb_port *port_dev = hub->ports[port - 1]; | |
3507 | struct usb_device *hdev; | |
3508 | struct usb_device *udev; | |
3509 | int connect_change = 0; | |
3510 | int ret; | |
3511 | ||
3512 | hdev = hub->hdev; | |
3513 | udev = port_dev->child; | |
3514 | if (!hub_is_superspeed(hdev)) { | |
3515 | if (!(portchange & USB_PORT_STAT_C_SUSPEND)) | |
3516 | return 0; | |
3517 | usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); | |
3518 | } else { | |
3519 | if (!udev || udev->state != USB_STATE_SUSPENDED || | |
3520 | (portstatus & USB_PORT_STAT_LINK_STATE) != | |
3521 | USB_SS_PORT_LS_U0) | |
3522 | return 0; | |
3523 | } | |
3524 | ||
3525 | if (udev) { | |
3526 | /* TRSMRCY = 10 msec */ | |
3527 | msleep(10); | |
3528 | ||
3529 | usb_unlock_port(port_dev); | |
3530 | ret = usb_remote_wakeup(udev); | |
3531 | usb_lock_port(port_dev); | |
3532 | if (ret < 0) | |
3533 | connect_change = 1; | |
3534 | } else { | |
3535 | ret = -ENODEV; | |
3536 | hub_port_disable(hub, port, 1); | |
3537 | } | |
3538 | dev_dbg(&port_dev->dev, "resume, status %d\n", ret); | |
3539 | return connect_change; | |
3540 | } | |
3541 | ||
e6f30dea ML |
3542 | static int check_ports_changed(struct usb_hub *hub) |
3543 | { | |
3544 | int port1; | |
3545 | ||
3546 | for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { | |
3547 | u16 portstatus, portchange; | |
3548 | int status; | |
3549 | ||
3550 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
3551 | if (!status && portchange) | |
3552 | return 1; | |
3553 | } | |
3554 | return 0; | |
3555 | } | |
3556 | ||
db690874 | 3557 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 | 3558 | { |
17248569 | 3559 | struct usb_hub *hub = usb_get_intfdata(intf); |
1da177e4 LT |
3560 | struct usb_device *hdev = hub->hdev; |
3561 | unsigned port1; | |
4296c70a | 3562 | int status; |
1da177e4 | 3563 | |
e583d9db AS |
3564 | /* |
3565 | * Warn if children aren't already suspended. | |
3566 | * Also, add up the number of wakeup-enabled descendants. | |
3567 | */ | |
3568 | hub->wakeup_enabled_descendants = 0; | |
1da177e4 | 3569 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
d99f6b41 DW |
3570 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
3571 | struct usb_device *udev = port_dev->child; | |
1da177e4 | 3572 | |
6840d255 | 3573 | if (udev && udev->can_submit) { |
b658b8f5 DW |
3574 | dev_warn(&port_dev->dev, "device %s not suspended yet\n", |
3575 | dev_name(&udev->dev)); | |
5b1b0b81 | 3576 | if (PMSG_IS_AUTO(msg)) |
cbb33004 | 3577 | return -EBUSY; |
c9f89fa4 | 3578 | } |
e583d9db AS |
3579 | if (udev) |
3580 | hub->wakeup_enabled_descendants += | |
3581 | wakeup_enabled_descendants(udev); | |
1da177e4 | 3582 | } |
e6f30dea ML |
3583 | |
3584 | if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { | |
3585 | /* check if there are changes pending on hub ports */ | |
3586 | if (check_ports_changed(hub)) { | |
3587 | if (PMSG_IS_AUTO(msg)) | |
3588 | return -EBUSY; | |
3589 | pm_wakeup_event(&hdev->dev, 2000); | |
3590 | } | |
3591 | } | |
3592 | ||
4296c70a SS |
3593 | if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { |
3594 | /* Enable hub to send remote wakeup for all ports. */ | |
3595 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { | |
3596 | status = set_port_feature(hdev, | |
3597 | port1 | | |
3598 | USB_PORT_FEAT_REMOTE_WAKE_CONNECT | | |
3599 | USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | | |
3600 | USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, | |
3601 | USB_PORT_FEAT_REMOTE_WAKE_MASK); | |
3602 | } | |
3603 | } | |
1da177e4 | 3604 | |
441b62c1 | 3605 | dev_dbg(&intf->dev, "%s\n", __func__); |
40f122f3 | 3606 | |
37ebb549 | 3607 | /* stop hub_wq and related activity */ |
4330354f | 3608 | hub_quiesce(hub, HUB_SUSPEND); |
b6f6436d | 3609 | return 0; |
1da177e4 LT |
3610 | } |
3611 | ||
3612 | static int hub_resume(struct usb_interface *intf) | |
3613 | { | |
5e6effae | 3614 | struct usb_hub *hub = usb_get_intfdata(intf); |
40f122f3 | 3615 | |
5e6effae | 3616 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3617 | hub_activate(hub, HUB_RESUME); |
1da177e4 LT |
3618 | return 0; |
3619 | } | |
3620 | ||
b41a60ec | 3621 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 3622 | { |
b41a60ec | 3623 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf | 3624 | |
5e6effae | 3625 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3626 | hub_activate(hub, HUB_RESET_RESUME); |
f07600cf AS |
3627 | return 0; |
3628 | } | |
3629 | ||
54515fe5 AS |
3630 | /** |
3631 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
3632 | * @rhdev: struct usb_device for the root hub | |
3633 | * | |
3634 | * The USB host controller driver calls this function when its root hub | |
3635 | * is resumed and Vbus power has been interrupted or the controller | |
feccc30d AS |
3636 | * has been reset. The routine marks @rhdev as having lost power. |
3637 | * When the hub driver is resumed it will take notice and carry out | |
3638 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; | |
3639 | * the others will be disconnected. | |
54515fe5 AS |
3640 | */ |
3641 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
3642 | { | |
3643 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
3644 | rhdev->reset_resume = 1; | |
3645 | } | |
3646 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
3647 | ||
1ea7e0e8 SS |
3648 | static const char * const usb3_lpm_names[] = { |
3649 | "U0", | |
3650 | "U1", | |
3651 | "U2", | |
3652 | "U3", | |
3653 | }; | |
3654 | ||
3655 | /* | |
3656 | * Send a Set SEL control transfer to the device, prior to enabling | |
3657 | * device-initiated U1 or U2. This lets the device know the exit latencies from | |
3658 | * the time the device initiates a U1 or U2 exit, to the time it will receive a | |
3659 | * packet from the host. | |
3660 | * | |
3661 | * This function will fail if the SEL or PEL values for udev are greater than | |
3662 | * the maximum allowed values for the link state to be enabled. | |
3663 | */ | |
3664 | static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) | |
3665 | { | |
3666 | struct usb_set_sel_req *sel_values; | |
3667 | unsigned long long u1_sel; | |
3668 | unsigned long long u1_pel; | |
3669 | unsigned long long u2_sel; | |
3670 | unsigned long long u2_pel; | |
3671 | int ret; | |
3672 | ||
38d7f688 XR |
3673 | if (udev->state != USB_STATE_CONFIGURED) |
3674 | return 0; | |
3675 | ||
1ea7e0e8 SS |
3676 | /* Convert SEL and PEL stored in ns to us */ |
3677 | u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); | |
3678 | u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); | |
3679 | u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); | |
3680 | u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); | |
3681 | ||
3682 | /* | |
3683 | * Make sure that the calculated SEL and PEL values for the link | |
3684 | * state we're enabling aren't bigger than the max SEL/PEL | |
3685 | * value that will fit in the SET SEL control transfer. | |
3686 | * Otherwise the device would get an incorrect idea of the exit | |
3687 | * latency for the link state, and could start a device-initiated | |
3688 | * U1/U2 when the exit latencies are too high. | |
3689 | */ | |
3690 | if ((state == USB3_LPM_U1 && | |
3691 | (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || | |
3692 | u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || | |
3693 | (state == USB3_LPM_U2 && | |
3694 | (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || | |
3695 | u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { | |
1510a1a2 | 3696 | dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", |
1ea7e0e8 SS |
3697 | usb3_lpm_names[state], u1_sel, u1_pel); |
3698 | return -EINVAL; | |
3699 | } | |
3700 | ||
3701 | /* | |
3702 | * If we're enabling device-initiated LPM for one link state, | |
3703 | * but the other link state has a too high SEL or PEL value, | |
3704 | * just set those values to the max in the Set SEL request. | |
3705 | */ | |
3706 | if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) | |
3707 | u1_sel = USB3_LPM_MAX_U1_SEL_PEL; | |
3708 | ||
3709 | if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) | |
3710 | u1_pel = USB3_LPM_MAX_U1_SEL_PEL; | |
3711 | ||
3712 | if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) | |
3713 | u2_sel = USB3_LPM_MAX_U2_SEL_PEL; | |
3714 | ||
3715 | if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) | |
3716 | u2_pel = USB3_LPM_MAX_U2_SEL_PEL; | |
3717 | ||
3718 | /* | |
3719 | * usb_enable_lpm() can be called as part of a failed device reset, | |
3720 | * which may be initiated by an error path of a mass storage driver. | |
3721 | * Therefore, use GFP_NOIO. | |
3722 | */ | |
3723 | sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); | |
3724 | if (!sel_values) | |
3725 | return -ENOMEM; | |
3726 | ||
3727 | sel_values->u1_sel = u1_sel; | |
3728 | sel_values->u1_pel = u1_pel; | |
3729 | sel_values->u2_sel = cpu_to_le16(u2_sel); | |
3730 | sel_values->u2_pel = cpu_to_le16(u2_pel); | |
3731 | ||
3732 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3733 | USB_REQ_SET_SEL, | |
3734 | USB_RECIP_DEVICE, | |
3735 | 0, 0, | |
3736 | sel_values, sizeof *(sel_values), | |
3737 | USB_CTRL_SET_TIMEOUT); | |
3738 | kfree(sel_values); | |
3739 | return ret; | |
3740 | } | |
3741 | ||
3742 | /* | |
3743 | * Enable or disable device-initiated U1 or U2 transitions. | |
3744 | */ | |
3745 | static int usb_set_device_initiated_lpm(struct usb_device *udev, | |
3746 | enum usb3_link_state state, bool enable) | |
3747 | { | |
3748 | int ret; | |
3749 | int feature; | |
3750 | ||
3751 | switch (state) { | |
3752 | case USB3_LPM_U1: | |
3753 | feature = USB_DEVICE_U1_ENABLE; | |
3754 | break; | |
3755 | case USB3_LPM_U2: | |
3756 | feature = USB_DEVICE_U2_ENABLE; | |
3757 | break; | |
3758 | default: | |
3759 | dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", | |
3760 | __func__, enable ? "enable" : "disable"); | |
3761 | return -EINVAL; | |
3762 | } | |
3763 | ||
3764 | if (udev->state != USB_STATE_CONFIGURED) { | |
3765 | dev_dbg(&udev->dev, "%s: Can't %s %s state " | |
3766 | "for unconfigured device.\n", | |
3767 | __func__, enable ? "enable" : "disable", | |
3768 | usb3_lpm_names[state]); | |
3769 | return 0; | |
3770 | } | |
3771 | ||
3772 | if (enable) { | |
1ea7e0e8 SS |
3773 | /* |
3774 | * Now send the control transfer to enable device-initiated LPM | |
3775 | * for either U1 or U2. | |
3776 | */ | |
3777 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3778 | USB_REQ_SET_FEATURE, | |
3779 | USB_RECIP_DEVICE, | |
3780 | feature, | |
3781 | 0, NULL, 0, | |
3782 | USB_CTRL_SET_TIMEOUT); | |
3783 | } else { | |
3784 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3785 | USB_REQ_CLEAR_FEATURE, | |
3786 | USB_RECIP_DEVICE, | |
3787 | feature, | |
3788 | 0, NULL, 0, | |
3789 | USB_CTRL_SET_TIMEOUT); | |
3790 | } | |
3791 | if (ret < 0) { | |
3792 | dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", | |
3793 | enable ? "Enable" : "Disable", | |
3794 | usb3_lpm_names[state]); | |
3795 | return -EBUSY; | |
3796 | } | |
3797 | return 0; | |
3798 | } | |
3799 | ||
3800 | static int usb_set_lpm_timeout(struct usb_device *udev, | |
3801 | enum usb3_link_state state, int timeout) | |
3802 | { | |
3803 | int ret; | |
3804 | int feature; | |
3805 | ||
3806 | switch (state) { | |
3807 | case USB3_LPM_U1: | |
3808 | feature = USB_PORT_FEAT_U1_TIMEOUT; | |
3809 | break; | |
3810 | case USB3_LPM_U2: | |
3811 | feature = USB_PORT_FEAT_U2_TIMEOUT; | |
3812 | break; | |
3813 | default: | |
3814 | dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", | |
3815 | __func__); | |
3816 | return -EINVAL; | |
3817 | } | |
3818 | ||
3819 | if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && | |
3820 | timeout != USB3_LPM_DEVICE_INITIATED) { | |
3821 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " | |
3822 | "which is a reserved value.\n", | |
3823 | usb3_lpm_names[state], timeout); | |
3824 | return -EINVAL; | |
3825 | } | |
3826 | ||
3827 | ret = set_port_feature(udev->parent, | |
3828 | USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, | |
3829 | feature); | |
3830 | if (ret < 0) { | |
3831 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," | |
3832 | "error code %i\n", usb3_lpm_names[state], | |
3833 | timeout, ret); | |
3834 | return -EBUSY; | |
3835 | } | |
3836 | if (state == USB3_LPM_U1) | |
3837 | udev->u1_params.timeout = timeout; | |
3838 | else | |
3839 | udev->u2_params.timeout = timeout; | |
3840 | return 0; | |
3841 | } | |
3842 | ||
3843 | /* | |
3844 | * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated | |
3845 | * U1/U2 entry. | |
3846 | * | |
3847 | * We will attempt to enable U1 or U2, but there are no guarantees that the | |
3848 | * control transfers to set the hub timeout or enable device-initiated U1/U2 | |
3849 | * will be successful. | |
3850 | * | |
3851 | * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI | |
3852 | * driver know about it. If that call fails, it should be harmless, and just | |
3853 | * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. | |
3854 | */ | |
3855 | static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
3856 | enum usb3_link_state state) | |
3857 | { | |
65a95b75 | 3858 | int timeout, ret; |
ae8963ad SS |
3859 | __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; |
3860 | __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; | |
3861 | ||
3862 | /* If the device says it doesn't have *any* exit latency to come out of | |
3863 | * U1 or U2, it's probably lying. Assume it doesn't implement that link | |
3864 | * state. | |
3865 | */ | |
3866 | if ((state == USB3_LPM_U1 && u1_mel == 0) || | |
3867 | (state == USB3_LPM_U2 && u2_mel == 0)) | |
3868 | return; | |
1ea7e0e8 | 3869 | |
65a95b75 SS |
3870 | /* |
3871 | * First, let the device know about the exit latencies | |
3872 | * associated with the link state we're about to enable. | |
3873 | */ | |
3874 | ret = usb_req_set_sel(udev, state); | |
3875 | if (ret < 0) { | |
3876 | dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", | |
3877 | usb3_lpm_names[state]); | |
3878 | return; | |
3879 | } | |
3880 | ||
1ea7e0e8 SS |
3881 | /* We allow the host controller to set the U1/U2 timeout internally |
3882 | * first, so that it can change its schedule to account for the | |
3883 | * additional latency to send data to a device in a lower power | |
3884 | * link state. | |
3885 | */ | |
3886 | timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); | |
3887 | ||
3888 | /* xHCI host controller doesn't want to enable this LPM state. */ | |
3889 | if (timeout == 0) | |
3890 | return; | |
3891 | ||
3892 | if (timeout < 0) { | |
3893 | dev_warn(&udev->dev, "Could not enable %s link state, " | |
3894 | "xHCI error %i.\n", usb3_lpm_names[state], | |
3895 | timeout); | |
3896 | return; | |
3897 | } | |
3898 | ||
bf5ce5bf | 3899 | if (usb_set_lpm_timeout(udev, state, timeout)) { |
1ea7e0e8 SS |
3900 | /* If we can't set the parent hub U1/U2 timeout, |
3901 | * device-initiated LPM won't be allowed either, so let the xHCI | |
3902 | * host know that this link state won't be enabled. | |
3903 | */ | |
3904 | hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); | |
bf5ce5bf LB |
3905 | } else { |
3906 | /* Only a configured device will accept the Set Feature | |
3907 | * U1/U2_ENABLE | |
3908 | */ | |
3909 | if (udev->actconfig) | |
3910 | usb_set_device_initiated_lpm(udev, state, true); | |
3911 | ||
3912 | /* As soon as usb_set_lpm_timeout(timeout) returns 0, the | |
3913 | * hub-initiated LPM is enabled. Thus, LPM is enabled no | |
3914 | * matter the result of usb_set_device_initiated_lpm(). | |
3915 | * The only difference is whether device is able to initiate | |
3916 | * LPM. | |
3917 | */ | |
3918 | if (state == USB3_LPM_U1) | |
3919 | udev->usb3_lpm_u1_enabled = 1; | |
3920 | else if (state == USB3_LPM_U2) | |
3921 | udev->usb3_lpm_u2_enabled = 1; | |
3922 | } | |
1ea7e0e8 SS |
3923 | } |
3924 | ||
3925 | /* | |
3926 | * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated | |
3927 | * U1/U2 entry. | |
3928 | * | |
3929 | * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. | |
3930 | * If zero is returned, the parent will not allow the link to go into U1/U2. | |
3931 | * | |
3932 | * If zero is returned, device-initiated U1/U2 entry may still be enabled, but | |
3933 | * it won't have an effect on the bus link state because the parent hub will | |
3934 | * still disallow device-initiated U1/U2 entry. | |
3935 | * | |
3936 | * If zero is returned, the xHCI host controller may still think U1/U2 entry is | |
3937 | * possible. The result will be slightly more bus bandwidth will be taken up | |
3938 | * (to account for U1/U2 exit latency), but it should be harmless. | |
3939 | */ | |
3940 | static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
3941 | enum usb3_link_state state) | |
3942 | { | |
1ea7e0e8 SS |
3943 | switch (state) { |
3944 | case USB3_LPM_U1: | |
1ea7e0e8 | 3945 | case USB3_LPM_U2: |
1ea7e0e8 SS |
3946 | break; |
3947 | default: | |
3948 | dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", | |
3949 | __func__); | |
3950 | return -EINVAL; | |
3951 | } | |
3952 | ||
3953 | if (usb_set_lpm_timeout(udev, state, 0)) | |
3954 | return -EBUSY; | |
3955 | ||
3956 | usb_set_device_initiated_lpm(udev, state, false); | |
3957 | ||
3958 | if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) | |
3959 | dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " | |
3960 | "bus schedule bandwidth may be impacted.\n", | |
3961 | usb3_lpm_names[state]); | |
bf5ce5bf LB |
3962 | |
3963 | /* As soon as usb_set_lpm_timeout(0) return 0, hub initiated LPM | |
3964 | * is disabled. Hub will disallows link to enter U1/U2 as well, | |
3965 | * even device is initiating LPM. Hence LPM is disabled if hub LPM | |
3966 | * timeout set to 0, no matter device-initiated LPM is disabled or | |
3967 | * not. | |
3968 | */ | |
3969 | if (state == USB3_LPM_U1) | |
3970 | udev->usb3_lpm_u1_enabled = 0; | |
3971 | else if (state == USB3_LPM_U2) | |
3972 | udev->usb3_lpm_u2_enabled = 0; | |
3973 | ||
1ea7e0e8 SS |
3974 | return 0; |
3975 | } | |
3976 | ||
3977 | /* | |
3978 | * Disable hub-initiated and device-initiated U1 and U2 entry. | |
3979 | * Caller must own the bandwidth_mutex. | |
3980 | * | |
3981 | * This will call usb_enable_lpm() on failure, which will decrement | |
3982 | * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. | |
3983 | */ | |
3984 | int usb_disable_lpm(struct usb_device *udev) | |
3985 | { | |
3986 | struct usb_hcd *hcd; | |
3987 | ||
3988 | if (!udev || !udev->parent || | |
8a1b2725 | 3989 | udev->speed < USB_SPEED_SUPER || |
51df62ff PA |
3990 | !udev->lpm_capable || |
3991 | udev->state < USB_STATE_DEFAULT) | |
1ea7e0e8 SS |
3992 | return 0; |
3993 | ||
3994 | hcd = bus_to_hcd(udev->bus); | |
3995 | if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) | |
3996 | return 0; | |
3997 | ||
3998 | udev->lpm_disable_count++; | |
55558c33 | 3999 | if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) |
1ea7e0e8 SS |
4000 | return 0; |
4001 | ||
4002 | /* If LPM is enabled, attempt to disable it. */ | |
4003 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) | |
4004 | goto enable_lpm; | |
4005 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) | |
4006 | goto enable_lpm; | |
4007 | ||
4008 | return 0; | |
4009 | ||
4010 | enable_lpm: | |
4011 | usb_enable_lpm(udev); | |
4012 | return -EBUSY; | |
4013 | } | |
4014 | EXPORT_SYMBOL_GPL(usb_disable_lpm); | |
4015 | ||
4016 | /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ | |
4017 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
4018 | { | |
4019 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
4020 | int ret; | |
4021 | ||
4022 | if (!hcd) | |
4023 | return -EINVAL; | |
4024 | ||
4025 | mutex_lock(hcd->bandwidth_mutex); | |
4026 | ret = usb_disable_lpm(udev); | |
4027 | mutex_unlock(hcd->bandwidth_mutex); | |
4028 | ||
4029 | return ret; | |
4030 | } | |
4031 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); | |
4032 | ||
4033 | /* | |
4034 | * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The | |
4035 | * xHCI host policy may prevent U1 or U2 from being enabled. | |
4036 | * | |
4037 | * Other callers may have disabled link PM, so U1 and U2 entry will be disabled | |
4038 | * until the lpm_disable_count drops to zero. Caller must own the | |
4039 | * bandwidth_mutex. | |
4040 | */ | |
4041 | void usb_enable_lpm(struct usb_device *udev) | |
4042 | { | |
4043 | struct usb_hcd *hcd; | |
513072d9 LB |
4044 | struct usb_hub *hub; |
4045 | struct usb_port *port_dev; | |
1ea7e0e8 SS |
4046 | |
4047 | if (!udev || !udev->parent || | |
8a1b2725 | 4048 | udev->speed < USB_SPEED_SUPER || |
51df62ff PA |
4049 | !udev->lpm_capable || |
4050 | udev->state < USB_STATE_DEFAULT) | |
1ea7e0e8 SS |
4051 | return; |
4052 | ||
4053 | udev->lpm_disable_count--; | |
4054 | hcd = bus_to_hcd(udev->bus); | |
4055 | /* Double check that we can both enable and disable LPM. | |
4056 | * Device must be configured to accept set feature U1/U2 timeout. | |
4057 | */ | |
4058 | if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || | |
4059 | !hcd->driver->disable_usb3_lpm_timeout) | |
4060 | return; | |
4061 | ||
4062 | if (udev->lpm_disable_count > 0) | |
4063 | return; | |
4064 | ||
513072d9 LB |
4065 | hub = usb_hub_to_struct_hub(udev->parent); |
4066 | if (!hub) | |
4067 | return; | |
4068 | ||
4069 | port_dev = hub->ports[udev->portnum - 1]; | |
4070 | ||
4071 | if (port_dev->usb3_lpm_u1_permit) | |
4072 | usb_enable_link_state(hcd, udev, USB3_LPM_U1); | |
4073 | ||
4074 | if (port_dev->usb3_lpm_u2_permit) | |
4075 | usb_enable_link_state(hcd, udev, USB3_LPM_U2); | |
1ea7e0e8 SS |
4076 | } |
4077 | EXPORT_SYMBOL_GPL(usb_enable_lpm); | |
4078 | ||
4079 | /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ | |
4080 | void usb_unlocked_enable_lpm(struct usb_device *udev) | |
4081 | { | |
4082 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
4083 | ||
4084 | if (!hcd) | |
4085 | return; | |
4086 | ||
4087 | mutex_lock(hcd->bandwidth_mutex); | |
4088 | usb_enable_lpm(udev); | |
4089 | mutex_unlock(hcd->bandwidth_mutex); | |
4090 | } | |
4091 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); | |
4092 | ||
37be6676 MN |
4093 | /* usb3 devices use U3 for disabled, make sure remote wakeup is disabled */ |
4094 | static void hub_usb3_port_prepare_disable(struct usb_hub *hub, | |
4095 | struct usb_port *port_dev) | |
4096 | { | |
4097 | struct usb_device *udev = port_dev->child; | |
4098 | int ret; | |
4099 | ||
4100 | if (udev && udev->port_is_suspended && udev->do_remote_wakeup) { | |
4101 | ret = hub_set_port_link_state(hub, port_dev->portnum, | |
4102 | USB_SS_PORT_LS_U0); | |
4103 | if (!ret) { | |
4104 | msleep(USB_RESUME_TIMEOUT); | |
4105 | ret = usb_disable_remote_wakeup(udev); | |
4106 | } | |
4107 | if (ret) | |
4108 | dev_warn(&udev->dev, | |
4109 | "Port disable: can't disable remote wake\n"); | |
4110 | udev->do_remote_wakeup = 0; | |
4111 | } | |
4112 | } | |
1ea7e0e8 | 4113 | |
d388dab7 AS |
4114 | #else /* CONFIG_PM */ |
4115 | ||
f07600cf AS |
4116 | #define hub_suspend NULL |
4117 | #define hub_resume NULL | |
4118 | #define hub_reset_resume NULL | |
1ea7e0e8 | 4119 | |
37be6676 MN |
4120 | static inline void hub_usb3_port_prepare_disable(struct usb_hub *hub, |
4121 | struct usb_port *port_dev) { } | |
4122 | ||
1ea7e0e8 SS |
4123 | int usb_disable_lpm(struct usb_device *udev) |
4124 | { | |
4125 | return 0; | |
4126 | } | |
e9261fb6 | 4127 | EXPORT_SYMBOL_GPL(usb_disable_lpm); |
1ea7e0e8 SS |
4128 | |
4129 | void usb_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 4130 | EXPORT_SYMBOL_GPL(usb_enable_lpm); |
1ea7e0e8 SS |
4131 | |
4132 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
4133 | { | |
4134 | return 0; | |
4135 | } | |
e9261fb6 | 4136 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); |
1ea7e0e8 SS |
4137 | |
4138 | void usb_unlocked_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 4139 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); |
f74631e3 SS |
4140 | |
4141 | int usb_disable_ltm(struct usb_device *udev) | |
4142 | { | |
4143 | return 0; | |
4144 | } | |
4145 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
4146 | ||
4147 | void usb_enable_ltm(struct usb_device *udev) { } | |
4148 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
c4b51a43 | 4149 | |
4a95b1fc SR |
4150 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, |
4151 | u16 portstatus, u16 portchange) | |
4152 | { | |
4153 | return 0; | |
4154 | } | |
4155 | ||
c4b51a43 | 4156 | #endif /* CONFIG_PM */ |
d388dab7 | 4157 | |
3bc02bce GU |
4158 | /* |
4159 | * USB-3 does not have a similar link state as USB-2 that will avoid negotiating | |
4160 | * a connection with a plugged-in cable but will signal the host when the cable | |
4161 | * is unplugged. Disable remote wake and set link state to U3 for USB-3 devices | |
4162 | */ | |
4163 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) | |
4164 | { | |
4165 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
4166 | struct usb_device *hdev = hub->hdev; | |
4167 | int ret = 0; | |
4168 | ||
4169 | if (!hub->error) { | |
4170 | if (hub_is_superspeed(hub->hdev)) { | |
4171 | hub_usb3_port_prepare_disable(hub, port_dev); | |
4172 | ret = hub_set_port_link_state(hub, port_dev->portnum, | |
4173 | USB_SS_PORT_LS_U3); | |
4174 | } else { | |
4175 | ret = usb_clear_port_feature(hdev, port1, | |
4176 | USB_PORT_FEAT_ENABLE); | |
4177 | } | |
4178 | } | |
4179 | if (port_dev->child && set_state) | |
4180 | usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED); | |
4181 | if (ret && ret != -ENODEV) | |
4182 | dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret); | |
4183 | return ret; | |
4184 | } | |
4185 | ||
8dd8d2c9 DD |
4186 | /* |
4187 | * usb_port_disable - disable a usb device's upstream port | |
4188 | * @udev: device to disable | |
4189 | * Context: @udev locked, must be able to sleep. | |
4190 | * | |
4191 | * Disables a USB device that isn't in active use. | |
4192 | */ | |
4193 | int usb_port_disable(struct usb_device *udev) | |
4194 | { | |
4195 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); | |
4196 | ||
4197 | return hub_port_disable(hub, udev->portnum, 0); | |
4198 | } | |
1da177e4 LT |
4199 | |
4200 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
4201 | * | |
4202 | * Between connect detection and reset signaling there must be a delay | |
4203 | * of 100ms at least for debounce and power-settling. The corresponding | |
4204 | * timer shall restart whenever the downstream port detects a disconnect. | |
469271f8 | 4205 | * |
1da177e4 LT |
4206 | * Apparently there are some bluetooth and irda-dongles and a number of |
4207 | * low-speed devices for which this debounce period may last over a second. | |
4208 | * Not covered by the spec - but easy to deal with. | |
4209 | * | |
4210 | * This implementation uses a 1500ms total debounce timeout; if the | |
4211 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
4212 | * every 25ms for transient disconnects. When the port status has been | |
4213 | * unchanged for 100ms it returns the port status. | |
4214 | */ | |
ad493e5e | 4215 | int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) |
1da177e4 LT |
4216 | { |
4217 | int ret; | |
1da177e4 LT |
4218 | u16 portchange, portstatus; |
4219 | unsigned connection = 0xffff; | |
d99f6b41 DW |
4220 | int total_time, stable_time = 0; |
4221 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
1da177e4 LT |
4222 | |
4223 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
4224 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
4225 | if (ret < 0) | |
4226 | return ret; | |
4227 | ||
4228 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
4229 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
ad493e5e LT |
4230 | if (!must_be_connected || |
4231 | (connection == USB_PORT_STAT_CONNECTION)) | |
4232 | stable_time += HUB_DEBOUNCE_STEP; | |
1da177e4 LT |
4233 | if (stable_time >= HUB_DEBOUNCE_STABLE) |
4234 | break; | |
4235 | } else { | |
4236 | stable_time = 0; | |
4237 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
4238 | } | |
4239 | ||
4240 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
ad493e5e | 4241 | usb_clear_port_feature(hub->hdev, port1, |
1da177e4 LT |
4242 | USB_PORT_FEAT_C_CONNECTION); |
4243 | } | |
4244 | ||
4245 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
4246 | break; | |
4247 | msleep(HUB_DEBOUNCE_STEP); | |
4248 | } | |
4249 | ||
d99f6b41 DW |
4250 | dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n", |
4251 | total_time, stable_time, portstatus); | |
1da177e4 LT |
4252 | |
4253 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
4254 | return -ETIMEDOUT; | |
4255 | return portstatus; | |
4256 | } | |
4257 | ||
fc721f51 | 4258 | void usb_ep0_reinit(struct usb_device *udev) |
1da177e4 | 4259 | { |
ddeac4e7 AS |
4260 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
4261 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); | |
2caf7fcd | 4262 | usb_enable_endpoint(udev, &udev->ep0, true); |
1da177e4 | 4263 | } |
fc721f51 | 4264 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
1da177e4 LT |
4265 | |
4266 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
4267 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
4268 | ||
4326ed0b | 4269 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
4270 | { |
4271 | int retval; | |
c6515272 | 4272 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 4273 | |
c6515272 SS |
4274 | /* |
4275 | * The host controller will choose the device address, | |
4276 | * instead of the core having chosen it earlier | |
4277 | */ | |
4278 | if (!hcd->driver->address_device && devnum <= 1) | |
1da177e4 LT |
4279 | return -EINVAL; |
4280 | if (udev->state == USB_STATE_ADDRESS) | |
4281 | return 0; | |
4282 | if (udev->state != USB_STATE_DEFAULT) | |
4283 | return -EINVAL; | |
c8d4af8e | 4284 | if (hcd->driver->address_device) |
c6515272 | 4285 | retval = hcd->driver->address_device(hcd, udev); |
c8d4af8e | 4286 | else |
c6515272 SS |
4287 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
4288 | USB_REQ_SET_ADDRESS, 0, devnum, 0, | |
4289 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1da177e4 | 4290 | if (retval == 0) { |
3b29b68b | 4291 | update_devnum(udev, devnum); |
4953d141 | 4292 | /* Device now using proper address. */ |
1da177e4 | 4293 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
fc721f51 | 4294 | usb_ep0_reinit(udev); |
1da177e4 LT |
4295 | } |
4296 | return retval; | |
4297 | } | |
4298 | ||
890dae88 MN |
4299 | /* |
4300 | * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM | |
4301 | * when they're plugged into a USB 2.0 port, but they don't work when LPM is | |
4302 | * enabled. | |
4303 | * | |
4304 | * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the | |
4305 | * device says it supports the new USB 2.0 Link PM errata by setting the BESL | |
4306 | * support bit in the BOS descriptor. | |
4307 | */ | |
4308 | static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) | |
4309 | { | |
d99f6b41 DW |
4310 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
4311 | int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; | |
890dae88 | 4312 | |
7b2db29f | 4313 | if (!udev->usb2_hw_lpm_capable || !udev->bos) |
890dae88 MN |
4314 | return; |
4315 | ||
d99f6b41 DW |
4316 | if (hub) |
4317 | connect_type = hub->ports[udev->portnum - 1]->connect_type; | |
890dae88 | 4318 | |
23c05820 | 4319 | if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || |
890dae88 MN |
4320 | connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
4321 | udev->usb2_hw_lpm_allowed = 1; | |
4322 | usb_set_usb2_hardware_lpm(udev, 1); | |
4323 | } | |
4324 | } | |
4325 | ||
48fc7dbd DW |
4326 | static int hub_enable_device(struct usb_device *udev) |
4327 | { | |
4328 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
4329 | ||
4330 | if (!hcd->driver->enable_device) | |
4331 | return 0; | |
4332 | if (udev->state == USB_STATE_ADDRESS) | |
4333 | return 0; | |
4334 | if (udev->state != USB_STATE_DEFAULT) | |
4335 | return -EINVAL; | |
4336 | ||
4337 | return hcd->driver->enable_device(hcd, udev); | |
4338 | } | |
4339 | ||
1da177e4 LT |
4340 | /* Reset device, (re)assign address, get device descriptor. |
4341 | * Device connection must be stable, no more debouncing needed. | |
4342 | * Returns device in USB_STATE_ADDRESS, except on error. | |
4343 | * | |
4344 | * If this is called for an already-existing device (as part of | |
5c79a1e3 DW |
4345 | * usb_reset_and_verify_device), the caller must own the device lock and |
4346 | * the port lock. For a newly detected device that is not accessible | |
4347 | * through any global pointers, it's not necessary to lock the device, | |
4348 | * but it is still necessary to lock the port. | |
1da177e4 LT |
4349 | */ |
4350 | static int | |
039b3307 | 4351 | hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1, |
1da177e4 LT |
4352 | int retry_counter) |
4353 | { | |
1da177e4 | 4354 | struct usb_device *hdev = hub->hdev; |
e7b77172 | 4355 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
0d5ce778 | 4356 | int retries, operations, retval, i; |
1da177e4 LT |
4357 | unsigned delay = HUB_SHORT_RESET_TIME; |
4358 | enum usb_device_speed oldspeed = udev->speed; | |
e538dfda | 4359 | const char *speed; |
4326ed0b | 4360 | int devnum = udev->devnum; |
1bb90cf0 | 4361 | const char *driver_name; |
1da177e4 LT |
4362 | |
4363 | /* root hub ports have a slightly longer reset period | |
4364 | * (from USB 2.0 spec, section 7.1.7.5) | |
4365 | */ | |
4366 | if (!hdev->parent) { | |
4367 | delay = HUB_ROOT_RESET_TIME; | |
4368 | if (port1 == hdev->bus->otg_port) | |
4369 | hdev->bus->b_hnp_enable = 0; | |
4370 | } | |
4371 | ||
4372 | /* Some low speed devices have problems with the quick delay, so */ | |
4373 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
4374 | if (oldspeed == USB_SPEED_LOW) | |
4375 | delay = HUB_LONG_RESET_TIME; | |
4376 | ||
feb26ac3 | 4377 | mutex_lock(hcd->address0_mutex); |
1da177e4 | 4378 | |
07194ab7 LT |
4379 | /* Reset the device; full speed may morph to high speed */ |
4380 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ | |
75d7cf72 | 4381 | retval = hub_port_reset(hub, port1, udev, delay, false); |
07194ab7 LT |
4382 | if (retval < 0) /* error or disconnect */ |
4383 | goto fail; | |
4384 | /* success, speed is known */ | |
4385 | ||
1da177e4 LT |
4386 | retval = -ENODEV; |
4387 | ||
8a1b2725 MN |
4388 | /* Don't allow speed changes at reset, except usb 3.0 to faster */ |
4389 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed && | |
4390 | !(oldspeed == USB_SPEED_SUPER && udev->speed > oldspeed)) { | |
1da177e4 LT |
4391 | dev_dbg(&udev->dev, "device reset changed speed!\n"); |
4392 | goto fail; | |
4393 | } | |
4394 | oldspeed = udev->speed; | |
4326ed0b | 4395 | |
1da177e4 LT |
4396 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
4397 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
4398 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
4399 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
4400 | */ |
4401 | switch (udev->speed) { | |
8a1b2725 | 4402 | case USB_SPEED_SUPER_PLUS: |
6b403b02 | 4403 | case USB_SPEED_SUPER: |
551cdbbe | 4404 | case USB_SPEED_WIRELESS: /* fixed at 512 */ |
551509d2 | 4405 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
5bb6e0ae | 4406 | break; |
1da177e4 | 4407 | case USB_SPEED_HIGH: /* fixed at 64 */ |
551509d2 | 4408 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4409 | break; |
4410 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
4411 | /* to determine the ep0 maxpacket size, try to read | |
4412 | * the device descriptor to get bMaxPacketSize0 and | |
4413 | * then correct our initial guess. | |
4414 | */ | |
551509d2 | 4415 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4416 | break; |
4417 | case USB_SPEED_LOW: /* fixed at 8 */ | |
551509d2 | 4418 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
1da177e4 LT |
4419 | break; |
4420 | default: | |
4421 | goto fail; | |
4422 | } | |
e538dfda MN |
4423 | |
4424 | if (udev->speed == USB_SPEED_WIRELESS) | |
4425 | speed = "variable speed Wireless"; | |
4426 | else | |
4427 | speed = usb_speed_string(udev->speed); | |
4428 | ||
1bb90cf0 PC |
4429 | /* |
4430 | * The controller driver may be NULL if the controller device | |
4431 | * is the middle device between platform device and roothub. | |
4432 | * This middle device may not need a device driver due to | |
4433 | * all hardware control can be at platform device driver, this | |
4434 | * platform device is usually a dual-role USB controller device. | |
4435 | */ | |
4436 | if (udev->bus->controller->driver) | |
4437 | driver_name = udev->bus->controller->driver->name; | |
4438 | else | |
4439 | driver_name = udev->bus->sysdev->driver->name; | |
4440 | ||
8a1b2725 | 4441 | if (udev->speed < USB_SPEED_SUPER) |
c6515272 | 4442 | dev_info(&udev->dev, |
e538dfda MN |
4443 | "%s %s USB device number %d using %s\n", |
4444 | (udev->config) ? "reset" : "new", speed, | |
1bb90cf0 | 4445 | devnum, driver_name); |
1da177e4 LT |
4446 | |
4447 | /* Set up TT records, if needed */ | |
4448 | if (hdev->tt) { | |
4449 | udev->tt = hdev->tt; | |
4450 | udev->ttport = hdev->ttport; | |
4451 | } else if (udev->speed != USB_SPEED_HIGH | |
4452 | && hdev->speed == USB_SPEED_HIGH) { | |
d199c96d AS |
4453 | if (!hub->tt.hub) { |
4454 | dev_err(&udev->dev, "parent hub has no TT\n"); | |
4455 | retval = -EINVAL; | |
4456 | goto fail; | |
4457 | } | |
1da177e4 LT |
4458 | udev->tt = &hub->tt; |
4459 | udev->ttport = port1; | |
4460 | } | |
469271f8 | 4461 | |
1da177e4 LT |
4462 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? |
4463 | * Because device hardware and firmware is sometimes buggy in | |
4464 | * this area, and this is how Linux has done it for ages. | |
4465 | * Change it cautiously. | |
4466 | * | |
48fc7dbd | 4467 | * NOTE: If use_new_scheme() is true we will start by issuing |
1da177e4 LT |
4468 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, |
4469 | * so it may help with some non-standards-compliant devices. | |
4470 | * Otherwise we start with SET_ADDRESS and then try to read the | |
4471 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
4472 | * value. | |
4473 | */ | |
0d5ce778 | 4474 | for (retries = 0; retries < GET_DESCRIPTOR_TRIES; (++retries, msleep(100))) { |
48fc7dbd DW |
4475 | bool did_new_scheme = false; |
4476 | ||
4477 | if (use_new_scheme(udev, retry_counter)) { | |
1da177e4 LT |
4478 | struct usb_device_descriptor *buf; |
4479 | int r = 0; | |
4480 | ||
48fc7dbd DW |
4481 | did_new_scheme = true; |
4482 | retval = hub_enable_device(udev); | |
938569eb ON |
4483 | if (retval < 0) { |
4484 | dev_err(&udev->dev, | |
4485 | "hub failed to enable device, error %d\n", | |
4486 | retval); | |
48fc7dbd | 4487 | goto fail; |
938569eb | 4488 | } |
48fc7dbd | 4489 | |
1da177e4 LT |
4490 | #define GET_DESCRIPTOR_BUFSIZE 64 |
4491 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
4492 | if (!buf) { | |
4493 | retval = -ENOMEM; | |
4494 | continue; | |
4495 | } | |
4496 | ||
b89ee19a AS |
4497 | /* Retry on all errors; some devices are flakey. |
4498 | * 255 is for WUSB devices, we actually need to use | |
4499 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 | 4500 | */ |
0d5ce778 | 4501 | for (operations = 0; operations < 3; ++operations) { |
1da177e4 LT |
4502 | buf->bMaxPacketSize0 = 0; |
4503 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
4504 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
4505 | USB_DT_DEVICE << 8, 0, | |
4506 | buf, GET_DESCRIPTOR_BUFSIZE, | |
fd7c519d | 4507 | initial_descriptor_timeout); |
1da177e4 | 4508 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 4509 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
4510 | if (buf->bDescriptorType == |
4511 | USB_DT_DEVICE) { | |
4512 | r = 0; | |
4513 | break; | |
4514 | } | |
4515 | /* FALL THROUGH */ | |
4516 | default: | |
4517 | if (r == 0) | |
4518 | r = -EPROTO; | |
4519 | break; | |
4520 | } | |
264904cc ON |
4521 | /* |
4522 | * Some devices time out if they are powered on | |
4523 | * when already connected. They need a second | |
4524 | * reset. But only on the first attempt, | |
4525 | * lest we get into a time out/reset loop | |
4526 | */ | |
0d5ce778 | 4527 | if (r == 0 || (r == -ETIMEDOUT && retries == 0)) |
1da177e4 LT |
4528 | break; |
4529 | } | |
4530 | udev->descriptor.bMaxPacketSize0 = | |
4531 | buf->bMaxPacketSize0; | |
4532 | kfree(buf); | |
4533 | ||
75d7cf72 | 4534 | retval = hub_port_reset(hub, port1, udev, delay, false); |
1da177e4 LT |
4535 | if (retval < 0) /* error or disconnect */ |
4536 | goto fail; | |
4537 | if (oldspeed != udev->speed) { | |
4538 | dev_dbg(&udev->dev, | |
4539 | "device reset changed speed!\n"); | |
4540 | retval = -ENODEV; | |
4541 | goto fail; | |
4542 | } | |
4543 | if (r) { | |
e9e88fb7 AS |
4544 | if (r != -ENODEV) |
4545 | dev_err(&udev->dev, "device descriptor read/64, error %d\n", | |
4546 | r); | |
1da177e4 LT |
4547 | retval = -EMSGSIZE; |
4548 | continue; | |
4549 | } | |
4550 | #undef GET_DESCRIPTOR_BUFSIZE | |
4551 | } | |
4552 | ||
469271f8 MB |
4553 | /* |
4554 | * If device is WUSB, we already assigned an | |
4555 | * unauthorized address in the Connect Ack sequence; | |
4556 | * authorization will assign the final address. | |
4557 | */ | |
c6515272 | 4558 | if (udev->wusb == 0) { |
0d5ce778 | 4559 | for (operations = 0; operations < SET_ADDRESS_TRIES; ++operations) { |
6c529cdc IPG |
4560 | retval = hub_set_address(udev, devnum); |
4561 | if (retval >= 0) | |
4562 | break; | |
4563 | msleep(200); | |
4564 | } | |
4565 | if (retval < 0) { | |
e9e88fb7 AS |
4566 | if (retval != -ENODEV) |
4567 | dev_err(&udev->dev, "device not accepting address %d, error %d\n", | |
4568 | devnum, retval); | |
6c529cdc IPG |
4569 | goto fail; |
4570 | } | |
8a1b2725 | 4571 | if (udev->speed >= USB_SPEED_SUPER) { |
c6515272 SS |
4572 | devnum = udev->devnum; |
4573 | dev_info(&udev->dev, | |
8a1b2725 | 4574 | "%s SuperSpeed%s USB device number %d using %s\n", |
c6515272 | 4575 | (udev->config) ? "reset" : "new", |
8a1b2725 | 4576 | (udev->speed == USB_SPEED_SUPER_PLUS) ? "Plus" : "", |
1bb90cf0 | 4577 | devnum, driver_name); |
c6515272 | 4578 | } |
6c529cdc IPG |
4579 | |
4580 | /* cope with hardware quirkiness: | |
4581 | * - let SET_ADDRESS settle, some device hardware wants it | |
4582 | * - read ep0 maxpacket even for high and low speed, | |
4583 | */ | |
4584 | msleep(10); | |
48fc7dbd DW |
4585 | /* use_new_scheme() checks the speed which may have |
4586 | * changed since the initial look so we cache the result | |
4587 | * in did_new_scheme | |
4588 | */ | |
4589 | if (did_new_scheme) | |
1da177e4 | 4590 | break; |
469271f8 | 4591 | } |
1da177e4 LT |
4592 | |
4593 | retval = usb_get_device_descriptor(udev, 8); | |
4594 | if (retval < 8) { | |
e9e88fb7 AS |
4595 | if (retval != -ENODEV) |
4596 | dev_err(&udev->dev, | |
b9cef6c3 WF |
4597 | "device descriptor read/8, error %d\n", |
4598 | retval); | |
1da177e4 LT |
4599 | if (retval >= 0) |
4600 | retval = -EMSGSIZE; | |
4601 | } else { | |
4602 | retval = 0; | |
4603 | break; | |
4604 | } | |
4605 | } | |
4606 | if (retval) | |
4607 | goto fail; | |
4608 | ||
d8aec3db EF |
4609 | /* |
4610 | * Some superspeed devices have finished the link training process | |
4611 | * and attached to a superspeed hub port, but the device descriptor | |
4612 | * got from those devices show they aren't superspeed devices. Warm | |
4613 | * reset the port attached by the devices can fix them. | |
4614 | */ | |
8a1b2725 | 4615 | if ((udev->speed >= USB_SPEED_SUPER) && |
d8aec3db EF |
4616 | (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { |
4617 | dev_err(&udev->dev, "got a wrong device descriptor, " | |
4618 | "warm reset device\n"); | |
4619 | hub_port_reset(hub, port1, udev, | |
4620 | HUB_BH_RESET_TIME, true); | |
4621 | retval = -EINVAL; | |
4622 | goto fail; | |
4623 | } | |
4624 | ||
6b403b02 | 4625 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
8a1b2725 | 4626 | udev->speed >= USB_SPEED_SUPER) |
6b403b02 SS |
4627 | i = 512; |
4628 | else | |
4629 | i = udev->descriptor.bMaxPacketSize0; | |
29cc8897 | 4630 | if (usb_endpoint_maxp(&udev->ep0.desc) != i) { |
56626a72 | 4631 | if (udev->speed == USB_SPEED_LOW || |
1da177e4 | 4632 | !(i == 8 || i == 16 || i == 32 || i == 64)) { |
56626a72 | 4633 | dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); |
1da177e4 LT |
4634 | retval = -EMSGSIZE; |
4635 | goto fail; | |
4636 | } | |
56626a72 AS |
4637 | if (udev->speed == USB_SPEED_FULL) |
4638 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
4639 | else | |
4640 | dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); | |
1da177e4 | 4641 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
fc721f51 | 4642 | usb_ep0_reinit(udev); |
1da177e4 | 4643 | } |
469271f8 | 4644 | |
1da177e4 LT |
4645 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); |
4646 | if (retval < (signed)sizeof(udev->descriptor)) { | |
e9e88fb7 AS |
4647 | if (retval != -ENODEV) |
4648 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", | |
4649 | retval); | |
1da177e4 LT |
4650 | if (retval >= 0) |
4651 | retval = -ENOMSG; | |
4652 | goto fail; | |
4653 | } | |
4654 | ||
ad87e032 AS |
4655 | usb_detect_quirks(udev); |
4656 | ||
1ff4df56 AX |
4657 | if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { |
4658 | retval = usb_get_bos_descriptor(udev); | |
51e0a012 | 4659 | if (!retval) { |
d9b2099c | 4660 | udev->lpm_capable = usb_device_supports_lpm(udev); |
51e0a012 SS |
4661 | usb_set_lpm_parameters(udev); |
4662 | } | |
1ff4df56 | 4663 | } |
3148bf04 | 4664 | |
1da177e4 | 4665 | retval = 0; |
48f24970 AD |
4666 | /* notify HCD that we have a device connected and addressed */ |
4667 | if (hcd->driver->update_device) | |
4668 | hcd->driver->update_device(hcd, udev); | |
890dae88 | 4669 | hub_set_initial_usb2_lpm_policy(udev); |
1da177e4 | 4670 | fail: |
4326ed0b | 4671 | if (retval) { |
1da177e4 | 4672 | hub_port_disable(hub, port1, 0); |
3b29b68b | 4673 | update_devnum(udev, devnum); /* for disconnect processing */ |
4326ed0b | 4674 | } |
feb26ac3 | 4675 | mutex_unlock(hcd->address0_mutex); |
1da177e4 LT |
4676 | return retval; |
4677 | } | |
4678 | ||
4679 | static void | |
039b3307 | 4680 | check_highspeed(struct usb_hub *hub, struct usb_device *udev, int port1) |
1da177e4 LT |
4681 | { |
4682 | struct usb_qualifier_descriptor *qual; | |
4683 | int status; | |
4684 | ||
2a159389 JH |
4685 | if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER) |
4686 | return; | |
4687 | ||
039b3307 | 4688 | qual = kmalloc(sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
4689 | if (qual == NULL) |
4690 | return; | |
4691 | ||
039b3307 | 4692 | status = usb_get_descriptor(udev, USB_DT_DEVICE_QUALIFIER, 0, |
1da177e4 LT |
4693 | qual, sizeof *qual); |
4694 | if (status == sizeof *qual) { | |
4695 | dev_info(&udev->dev, "not running at top speed; " | |
4696 | "connect to a high speed hub\n"); | |
4697 | /* hub LEDs are probably harder to miss than syslog */ | |
4698 | if (hub->has_indicators) { | |
4699 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
22f6a0f0 SD |
4700 | queue_delayed_work(system_power_efficient_wq, |
4701 | &hub->leds, 0); | |
1da177e4 LT |
4702 | } |
4703 | } | |
1bc3c9e1 | 4704 | kfree(qual); |
1da177e4 LT |
4705 | } |
4706 | ||
4707 | static unsigned | |
039b3307 | 4708 | hub_power_remaining(struct usb_hub *hub) |
1da177e4 LT |
4709 | { |
4710 | struct usb_device *hdev = hub->hdev; | |
4711 | int remaining; | |
55c52718 | 4712 | int port1; |
1da177e4 | 4713 | |
55c52718 | 4714 | if (!hub->limited_power) |
1da177e4 LT |
4715 | return 0; |
4716 | ||
55c52718 AS |
4717 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
4718 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
d99f6b41 DW |
4719 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
4720 | struct usb_device *udev = port_dev->child; | |
4721 | unsigned unit_load; | |
4722 | int delta; | |
1da177e4 LT |
4723 | |
4724 | if (!udev) | |
4725 | continue; | |
430ee58e SAS |
4726 | if (hub_is_superspeed(udev)) |
4727 | unit_load = 150; | |
4728 | else | |
4729 | unit_load = 100; | |
1da177e4 | 4730 | |
430ee58e SAS |
4731 | /* |
4732 | * Unconfigured devices may not use more than one unit load, | |
4733 | * or 8mA for OTG ports | |
4734 | */ | |
1da177e4 | 4735 | if (udev->actconfig) |
8d8479db | 4736 | delta = usb_get_max_power(udev, udev->actconfig); |
55c52718 | 4737 | else if (port1 != udev->bus->otg_port || hdev->parent) |
430ee58e | 4738 | delta = unit_load; |
1da177e4 | 4739 | else |
55c52718 AS |
4740 | delta = 8; |
4741 | if (delta > hub->mA_per_port) | |
d99f6b41 DW |
4742 | dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n", |
4743 | delta, hub->mA_per_port); | |
1da177e4 LT |
4744 | remaining -= delta; |
4745 | } | |
4746 | if (remaining < 0) { | |
55c52718 | 4747 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
469271f8 | 4748 | -remaining); |
1da177e4 LT |
4749 | remaining = 0; |
4750 | } | |
4751 | return remaining; | |
4752 | } | |
4753 | ||
af376a46 DW |
4754 | static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, |
4755 | u16 portchange) | |
1da177e4 | 4756 | { |
94c43b98 AS |
4757 | int status = -ENODEV; |
4758 | int i; | |
430ee58e | 4759 | unsigned unit_load; |
1da177e4 | 4760 | struct usb_device *hdev = hub->hdev; |
90da096e | 4761 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
d99f6b41 | 4762 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
af376a46 | 4763 | struct usb_device *udev = port_dev->child; |
5ee0f803 | 4764 | static int unreliable_port = -1; |
8808f00c | 4765 | |
24618b0c | 4766 | /* Disconnect any existing devices under this port */ |
b76baa81 | 4767 | if (udev) { |
b2108f1e | 4768 | if (hcd->usb_phy && !hdev->parent) |
3d46e73d | 4769 | usb_phy_notify_disconnect(hcd->usb_phy, udev->speed); |
d99f6b41 | 4770 | usb_disconnect(&port_dev->child); |
b76baa81 | 4771 | } |
24618b0c | 4772 | |
253e0572 AS |
4773 | /* We can forget about a "removed" device when there's a physical |
4774 | * disconnect or the connect status changes. | |
4775 | */ | |
4776 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4777 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
4778 | clear_bit(port1, hub->removed_bits); | |
4779 | ||
5257d97a AS |
4780 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
4781 | USB_PORT_STAT_C_ENABLE)) { | |
ad493e5e | 4782 | status = hub_port_debounce_be_stable(hub, port1); |
5257d97a | 4783 | if (status < 0) { |
5ee0f803 ON |
4784 | if (status != -ENODEV && |
4785 | port1 != unreliable_port && | |
4786 | printk_ratelimit()) | |
dd5f5006 | 4787 | dev_err(&port_dev->dev, "connect-debounce failed\n"); |
5257d97a | 4788 | portstatus &= ~USB_PORT_STAT_CONNECTION; |
5ee0f803 | 4789 | unreliable_port = port1; |
5257d97a AS |
4790 | } else { |
4791 | portstatus = status; | |
4792 | } | |
4793 | } | |
4794 | ||
253e0572 AS |
4795 | /* Return now if debouncing failed or nothing is connected or |
4796 | * the device was "removed". | |
4797 | */ | |
4798 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4799 | test_bit(port1, hub->removed_bits)) { | |
1da177e4 | 4800 | |
fbaecff0 DD |
4801 | /* |
4802 | * maybe switch power back on (e.g. root hub was reset) | |
4803 | * but only if the port isn't owned by someone else. | |
4804 | */ | |
9262c19d | 4805 | if (hub_is_port_power_switchable(hub) |
fbaecff0 DD |
4806 | && !port_is_power_on(hub, portstatus) |
4807 | && !port_dev->port_owner) | |
1da177e4 | 4808 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
5257d97a | 4809 | |
1da177e4 | 4810 | if (portstatus & USB_PORT_STAT_ENABLE) |
469271f8 | 4811 | goto done; |
1da177e4 LT |
4812 | return; |
4813 | } | |
430ee58e SAS |
4814 | if (hub_is_superspeed(hub->hdev)) |
4815 | unit_load = 150; | |
4816 | else | |
4817 | unit_load = 100; | |
1da177e4 | 4818 | |
e9e88fb7 | 4819 | status = 0; |
1da177e4 | 4820 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
1da177e4 LT |
4821 | |
4822 | /* reallocate for each attempt, since references | |
4823 | * to the previous one can escape in various ways | |
4824 | */ | |
4825 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
4826 | if (!udev) { | |
d99f6b41 DW |
4827 | dev_err(&port_dev->dev, |
4828 | "couldn't allocate usb_device\n"); | |
1da177e4 LT |
4829 | goto done; |
4830 | } | |
4831 | ||
4832 | usb_set_device_state(udev, USB_STATE_POWERED); | |
469271f8 | 4833 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 4834 | udev->level = hdev->level + 1; |
8af548dc | 4835 | udev->wusb = hub_is_wusb(hub); |
55c52718 | 4836 | |
8a1b2725 | 4837 | /* Devices connected to SuperSpeed hubs are USB 3.0 or later */ |
131dec34 | 4838 | if (hub_is_superspeed(hub->hdev)) |
e7b77172 SS |
4839 | udev->speed = USB_SPEED_SUPER; |
4840 | else | |
4841 | udev->speed = USB_SPEED_UNKNOWN; | |
4842 | ||
3b29b68b | 4843 | choose_devnum(udev); |
c8d4af8e AX |
4844 | if (udev->devnum <= 0) { |
4845 | status = -ENOTCONN; /* Don't retry */ | |
4846 | goto loop; | |
c6515272 SS |
4847 | } |
4848 | ||
e7b77172 | 4849 | /* reset (non-USB 3.0 devices) and get descriptor */ |
5c79a1e3 | 4850 | usb_lock_port(port_dev); |
1da177e4 | 4851 | status = hub_port_init(hub, udev, port1, i); |
5c79a1e3 | 4852 | usb_unlock_port(port_dev); |
1da177e4 LT |
4853 | if (status < 0) |
4854 | goto loop; | |
4855 | ||
93362a87 | 4856 | if (udev->quirks & USB_QUIRK_DELAY_INIT) |
b2a542bb | 4857 | msleep(2000); |
93362a87 | 4858 | |
1da177e4 LT |
4859 | /* consecutive bus-powered hubs aren't reliable; they can |
4860 | * violate the voltage drop budget. if the new child has | |
4861 | * a "powered" LED, users should notice we didn't enable it | |
4862 | * (without reading syslog), even without per-port LEDs | |
4863 | * on the parent. | |
4864 | */ | |
4865 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
430ee58e | 4866 | && udev->bus_mA <= unit_load) { |
1da177e4 LT |
4867 | u16 devstat; |
4868 | ||
d9e1e148 | 4869 | status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, |
1da177e4 | 4870 | &devstat); |
15b7336e | 4871 | if (status) { |
1da177e4 LT |
4872 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
4873 | goto loop_disable; | |
4874 | } | |
1da177e4 LT |
4875 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
4876 | dev_err(&udev->dev, | |
4877 | "can't connect bus-powered hub " | |
4878 | "to this port\n"); | |
4879 | if (hub->has_indicators) { | |
4880 | hub->indicator[port1-1] = | |
4881 | INDICATOR_AMBER_BLINK; | |
22f6a0f0 SD |
4882 | queue_delayed_work( |
4883 | system_power_efficient_wq, | |
4884 | &hub->leds, 0); | |
1da177e4 LT |
4885 | } |
4886 | status = -ENOTCONN; /* Don't retry */ | |
4887 | goto loop_disable; | |
4888 | } | |
4889 | } | |
469271f8 | 4890 | |
1da177e4 LT |
4891 | /* check for devices running slower than they could */ |
4892 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
4893 | && udev->speed == USB_SPEED_FULL | |
4894 | && highspeed_hubs != 0) | |
039b3307 | 4895 | check_highspeed(hub, udev, port1); |
1da177e4 | 4896 | |
fa286188 | 4897 | /* Store the parent's children[] pointer. At this point |
1da177e4 LT |
4898 | * udev becomes globally accessible, although presumably |
4899 | * no one will look at it until hdev is unlocked. | |
4900 | */ | |
1da177e4 LT |
4901 | status = 0; |
4902 | ||
d8521afe DW |
4903 | mutex_lock(&usb_port_peer_mutex); |
4904 | ||
1da177e4 LT |
4905 | /* We mustn't add new devices if the parent hub has |
4906 | * been disconnected; we would race with the | |
4907 | * recursively_mark_NOTATTACHED() routine. | |
4908 | */ | |
4909 | spin_lock_irq(&device_state_lock); | |
4910 | if (hdev->state == USB_STATE_NOTATTACHED) | |
4911 | status = -ENOTCONN; | |
4912 | else | |
d99f6b41 | 4913 | port_dev->child = udev; |
1da177e4 | 4914 | spin_unlock_irq(&device_state_lock); |
d8521afe | 4915 | mutex_unlock(&usb_port_peer_mutex); |
1da177e4 LT |
4916 | |
4917 | /* Run it through the hoops (find a driver, etc) */ | |
4918 | if (!status) { | |
4919 | status = usb_new_device(udev); | |
4920 | if (status) { | |
d8521afe | 4921 | mutex_lock(&usb_port_peer_mutex); |
1da177e4 | 4922 | spin_lock_irq(&device_state_lock); |
d99f6b41 | 4923 | port_dev->child = NULL; |
1da177e4 | 4924 | spin_unlock_irq(&device_state_lock); |
d8521afe | 4925 | mutex_unlock(&usb_port_peer_mutex); |
01ed67dc TZ |
4926 | } else { |
4927 | if (hcd->usb_phy && !hdev->parent) | |
4928 | usb_phy_notify_connect(hcd->usb_phy, | |
4929 | udev->speed); | |
1da177e4 LT |
4930 | } |
4931 | } | |
4932 | ||
1da177e4 LT |
4933 | if (status) |
4934 | goto loop_disable; | |
4935 | ||
4936 | status = hub_power_remaining(hub); | |
4937 | if (status) | |
d99f6b41 | 4938 | dev_dbg(hub->intfdev, "%dmA power budget left\n", status); |
1da177e4 LT |
4939 | |
4940 | return; | |
4941 | ||
4942 | loop_disable: | |
4943 | hub_port_disable(hub, port1, 1); | |
4944 | loop: | |
fc721f51 | 4945 | usb_ep0_reinit(udev); |
3b29b68b | 4946 | release_devnum(udev); |
f7410ced | 4947 | hub_free_dev(udev); |
1da177e4 | 4948 | usb_put_dev(udev); |
ffcdc18d | 4949 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 | 4950 | break; |
973593a9 ML |
4951 | |
4952 | /* When halfway through our retry count, power-cycle the port */ | |
4953 | if (i == (SET_CONFIG_TRIES / 2) - 1) { | |
4954 | dev_info(&port_dev->dev, "attempt power cycle\n"); | |
4955 | usb_hub_set_port_power(hdev, hub, port1, false); | |
4956 | msleep(2 * hub_power_on_good_delay(hub)); | |
4957 | usb_hub_set_port_power(hdev, hub, port1, true); | |
4958 | msleep(hub_power_on_good_delay(hub)); | |
4959 | } | |
1da177e4 | 4960 | } |
3a31155c AS |
4961 | if (hub->hdev->parent || |
4962 | !hcd->driver->port_handed_over || | |
e9e88fb7 AS |
4963 | !(hcd->driver->port_handed_over)(hcd, port1)) { |
4964 | if (status != -ENOTCONN && status != -ENODEV) | |
d99f6b41 DW |
4965 | dev_err(&port_dev->dev, |
4966 | "unable to enumerate USB device\n"); | |
e9e88fb7 | 4967 | } |
469271f8 | 4968 | |
1da177e4 LT |
4969 | done: |
4970 | hub_port_disable(hub, port1, 1); | |
94c43b98 AS |
4971 | if (hcd->driver->relinquish_port && !hub->hdev->parent) { |
4972 | if (status != -ENOTCONN && status != -ENODEV) | |
4973 | hcd->driver->relinquish_port(hcd, port1); | |
4974 | } | |
1da177e4 LT |
4975 | } |
4976 | ||
af376a46 DW |
4977 | /* Handle physical or logical connection change events. |
4978 | * This routine is called when: | |
4979 | * a port connection-change occurs; | |
4980 | * a port enable-change occurs (often caused by EMI); | |
4981 | * usb_reset_and_verify_device() encounters changed descriptors (as from | |
4982 | * a firmware download) | |
4983 | * caller already locked the hub | |
4984 | */ | |
4985 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
4986 | u16 portstatus, u16 portchange) | |
5c79a1e3 | 4987 | __must_hold(&port_dev->status_lock) |
714b07be | 4988 | { |
af376a46 DW |
4989 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
4990 | struct usb_device *udev = port_dev->child; | |
4991 | int status = -ENODEV; | |
714b07be | 4992 | |
af376a46 DW |
4993 | dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus, |
4994 | portchange, portspeed(hub, portstatus)); | |
4995 | ||
4996 | if (hub->has_indicators) { | |
4997 | set_port_led(hub, port1, HUB_LED_AUTO); | |
4998 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
4ee823b8 SS |
4999 | } |
5000 | ||
af376a46 DW |
5001 | #ifdef CONFIG_USB_OTG |
5002 | /* during HNP, don't repeat the debounce */ | |
5003 | if (hub->hdev->bus->is_b_host) | |
5004 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | | |
5005 | USB_PORT_STAT_C_ENABLE); | |
5006 | #endif | |
5007 | ||
5008 | /* Try to resuscitate an existing device */ | |
5009 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && | |
5010 | udev->state != USB_STATE_NOTATTACHED) { | |
5011 | if (portstatus & USB_PORT_STAT_ENABLE) { | |
5012 | status = 0; /* Nothing to do */ | |
ceb6c9c8 | 5013 | #ifdef CONFIG_PM |
af376a46 DW |
5014 | } else if (udev->state == USB_STATE_SUSPENDED && |
5015 | udev->persist_enabled) { | |
5016 | /* For a suspended device, treat this as a | |
5017 | * remote wakeup event. | |
5018 | */ | |
5c79a1e3 | 5019 | usb_unlock_port(port_dev); |
af376a46 | 5020 | status = usb_remote_wakeup(udev); |
5c79a1e3 | 5021 | usb_lock_port(port_dev); |
af376a46 DW |
5022 | #endif |
5023 | } else { | |
5024 | /* Don't resuscitate */; | |
5025 | } | |
af376a46 DW |
5026 | } |
5027 | clear_bit(port1, hub->change_bits); | |
5028 | ||
5c79a1e3 | 5029 | /* successfully revalidated the connection */ |
af376a46 DW |
5030 | if (status == 0) |
5031 | return; | |
5032 | ||
5c79a1e3 | 5033 | usb_unlock_port(port_dev); |
af376a46 | 5034 | hub_port_connect(hub, port1, portstatus, portchange); |
5c79a1e3 | 5035 | usb_lock_port(port_dev); |
1da177e4 LT |
5036 | } |
5037 | ||
af376a46 | 5038 | static void port_event(struct usb_hub *hub, int port1) |
5c79a1e3 | 5039 | __must_hold(&port_dev->status_lock) |
af376a46 | 5040 | { |
7671bd1e | 5041 | int connect_change; |
af376a46 DW |
5042 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
5043 | struct usb_device *udev = port_dev->child; | |
5044 | struct usb_device *hdev = hub->hdev; | |
5045 | u16 portstatus, portchange; | |
5046 | ||
5047 | connect_change = test_bit(port1, hub->change_bits); | |
5048 | clear_bit(port1, hub->event_bits); | |
5049 | clear_bit(port1, hub->wakeup_bits); | |
5050 | ||
5051 | if (hub_port_status(hub, port1, &portstatus, &portchange) < 0) | |
5052 | return; | |
5053 | ||
5054 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
5055 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); | |
5056 | connect_change = 1; | |
5057 | } | |
5058 | ||
5059 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
5060 | if (!connect_change) | |
5061 | dev_dbg(&port_dev->dev, "enable change, status %08x\n", | |
5062 | portstatus); | |
5063 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); | |
5064 | ||
5065 | /* | |
5066 | * EM interference sometimes causes badly shielded USB devices | |
5067 | * to be shutdown by the hub, this hack enables them again. | |
5068 | * Works at least with mouse driver. | |
5069 | */ | |
5070 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
5071 | && !connect_change && udev) { | |
5072 | dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n"); | |
5073 | connect_change = 1; | |
5074 | } | |
5075 | } | |
5076 | ||
5077 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
5078 | u16 status = 0, unused; | |
5079 | ||
5080 | dev_dbg(&port_dev->dev, "over-current change\n"); | |
5081 | usb_clear_port_feature(hdev, port1, | |
5082 | USB_PORT_FEAT_C_OVER_CURRENT); | |
5083 | msleep(100); /* Cool down */ | |
5084 | hub_power_on(hub, true); | |
5085 | hub_port_status(hub, port1, &status, &unused); | |
5086 | if (status & USB_PORT_STAT_OVERCURRENT) | |
5087 | dev_err(&port_dev->dev, "over-current condition\n"); | |
5088 | } | |
5089 | ||
5090 | if (portchange & USB_PORT_STAT_C_RESET) { | |
5091 | dev_dbg(&port_dev->dev, "reset change\n"); | |
5092 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET); | |
5093 | } | |
5094 | if ((portchange & USB_PORT_STAT_C_BH_RESET) | |
5095 | && hub_is_superspeed(hdev)) { | |
5096 | dev_dbg(&port_dev->dev, "warm reset change\n"); | |
5097 | usb_clear_port_feature(hdev, port1, | |
5098 | USB_PORT_FEAT_C_BH_PORT_RESET); | |
5099 | } | |
5100 | if (portchange & USB_PORT_STAT_C_LINK_STATE) { | |
5101 | dev_dbg(&port_dev->dev, "link state change\n"); | |
5102 | usb_clear_port_feature(hdev, port1, | |
5103 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
5104 | } | |
5105 | if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { | |
5106 | dev_warn(&port_dev->dev, "config error\n"); | |
5107 | usb_clear_port_feature(hdev, port1, | |
5108 | USB_PORT_FEAT_C_PORT_CONFIG_ERROR); | |
5109 | } | |
5110 | ||
097a155f DW |
5111 | /* skip port actions that require the port to be powered on */ |
5112 | if (!pm_runtime_active(&port_dev->dev)) | |
5113 | return; | |
714b07be | 5114 | |
af376a46 DW |
5115 | if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange)) |
5116 | connect_change = 1; | |
5117 | ||
5118 | /* | |
5119 | * Warm reset a USB3 protocol port if it's in | |
5120 | * SS.Inactive state. | |
5121 | */ | |
3cd12f91 | 5122 | if (hub_port_warm_reset_required(hub, port1, portstatus)) { |
af376a46 DW |
5123 | dev_dbg(&port_dev->dev, "do warm reset\n"); |
5124 | if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION) | |
5125 | || udev->state == USB_STATE_NOTATTACHED) { | |
5126 | if (hub_port_reset(hub, port1, NULL, | |
5127 | HUB_BH_RESET_TIME, true) < 0) | |
5128 | hub_port_disable(hub, port1, 1); | |
7671bd1e ZJC |
5129 | } else { |
5130 | usb_unlock_port(port_dev); | |
5131 | usb_lock_device(udev); | |
5132 | usb_reset_device(udev); | |
5133 | usb_unlock_device(udev); | |
5134 | usb_lock_port(port_dev); | |
5135 | connect_change = 0; | |
5136 | } | |
714b07be | 5137 | } |
af376a46 DW |
5138 | |
5139 | if (connect_change) | |
5140 | hub_port_connect_change(hub, port1, portstatus, portchange); | |
714b07be SS |
5141 | } |
5142 | ||
32a69589 | 5143 | static void hub_event(struct work_struct *work) |
1da177e4 | 5144 | { |
1da177e4 LT |
5145 | struct usb_device *hdev; |
5146 | struct usb_interface *intf; | |
5147 | struct usb_hub *hub; | |
5148 | struct device *hub_dev; | |
5149 | u16 hubstatus; | |
5150 | u16 hubchange; | |
1da177e4 | 5151 | int i, ret; |
1da177e4 | 5152 | |
32a69589 | 5153 | hub = container_of(work, struct usb_hub, events); |
eb6e2924 PM |
5154 | hdev = hub->hdev; |
5155 | hub_dev = hub->intfdev; | |
5156 | intf = to_usb_interface(hub_dev); | |
32a69589 | 5157 | |
eb6e2924 PM |
5158 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
5159 | hdev->state, hdev->maxchild, | |
5160 | /* NOTE: expects max 15 ports... */ | |
5161 | (u16) hub->change_bits[0], | |
5162 | (u16) hub->event_bits[0]); | |
5163 | ||
5164 | /* Lock the device, then check to see if we were | |
5165 | * disconnected while waiting for the lock to succeed. */ | |
5166 | usb_lock_device(hdev); | |
5167 | if (unlikely(hub->disconnected)) | |
32a69589 | 5168 | goto out_hdev_lock; |
eb6e2924 PM |
5169 | |
5170 | /* If the hub has died, clean up after it */ | |
5171 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
5172 | hub->error = -ENODEV; | |
5173 | hub_quiesce(hub, HUB_DISCONNECT); | |
32a69589 | 5174 | goto out_hdev_lock; |
eb6e2924 PM |
5175 | } |
5176 | ||
5177 | /* Autoresume */ | |
5178 | ret = usb_autopm_get_interface(intf); | |
5179 | if (ret) { | |
5180 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
32a69589 | 5181 | goto out_hdev_lock; |
eb6e2924 | 5182 | } |
1da177e4 | 5183 | |
eb6e2924 PM |
5184 | /* If this is an inactive hub, do nothing */ |
5185 | if (hub->quiescing) | |
5186 | goto out_autopm; | |
1da177e4 | 5187 | |
eb6e2924 PM |
5188 | if (hub->error) { |
5189 | dev_dbg(hub_dev, "resetting for error %d\n", hub->error); | |
5190 | ||
5191 | ret = usb_reset_device(hdev); | |
40f122f3 | 5192 | if (ret) { |
eb6e2924 PM |
5193 | dev_dbg(hub_dev, "error resetting hub: %d\n", ret); |
5194 | goto out_autopm; | |
40f122f3 | 5195 | } |
a8e7c565 | 5196 | |
eb6e2924 PM |
5197 | hub->nerrors = 0; |
5198 | hub->error = 0; | |
5199 | } | |
1da177e4 | 5200 | |
eb6e2924 PM |
5201 | /* deal with port status changes */ |
5202 | for (i = 1; i <= hdev->maxchild; i++) { | |
5203 | struct usb_port *port_dev = hub->ports[i - 1]; | |
1da177e4 | 5204 | |
eb6e2924 PM |
5205 | if (test_bit(i, hub->event_bits) |
5206 | || test_bit(i, hub->change_bits) | |
5207 | || test_bit(i, hub->wakeup_bits)) { | |
5208 | /* | |
5209 | * The get_noresume and barrier ensure that if | |
5210 | * the port was in the process of resuming, we | |
5211 | * flush that work and keep the port active for | |
5212 | * the duration of the port_event(). However, | |
5213 | * if the port is runtime pm suspended | |
5214 | * (powered-off), we leave it in that state, run | |
5215 | * an abbreviated port_event(), and move on. | |
5216 | */ | |
5217 | pm_runtime_get_noresume(&port_dev->dev); | |
5218 | pm_runtime_barrier(&port_dev->dev); | |
5219 | usb_lock_port(port_dev); | |
5220 | port_event(hub, i); | |
5221 | usb_unlock_port(port_dev); | |
5222 | pm_runtime_put_sync(&port_dev->dev); | |
1da177e4 | 5223 | } |
eb6e2924 | 5224 | } |
1da177e4 | 5225 | |
eb6e2924 PM |
5226 | /* deal with hub status changes */ |
5227 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
5228 | ; /* do nothing */ | |
5229 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
5230 | dev_err(hub_dev, "get_hub_status failed\n"); | |
5231 | else { | |
5232 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
5233 | dev_dbg(hub_dev, "power change\n"); | |
5234 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
5235 | if (hubstatus & HUB_STATUS_LOCAL_POWER) | |
5236 | /* FIXME: Is this always true? */ | |
5237 | hub->limited_power = 1; | |
5238 | else | |
5239 | hub->limited_power = 0; | |
af376a46 | 5240 | } |
eb6e2924 PM |
5241 | if (hubchange & HUB_CHANGE_OVERCURRENT) { |
5242 | u16 status = 0; | |
5243 | u16 unused; | |
1da177e4 | 5244 | |
eb6e2924 PM |
5245 | dev_dbg(hub_dev, "over-current change\n"); |
5246 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); | |
5247 | msleep(500); /* Cool down */ | |
5248 | hub_power_on(hub, true); | |
5249 | hub_hub_status(hub, &status, &unused); | |
5250 | if (status & HUB_STATUS_OVERCURRENT) | |
5251 | dev_err(hub_dev, "over-current condition\n"); | |
1da177e4 | 5252 | } |
eb6e2924 | 5253 | } |
1da177e4 | 5254 | |
eb6e2924 PM |
5255 | out_autopm: |
5256 | /* Balance the usb_autopm_get_interface() above */ | |
5257 | usb_autopm_put_interface_no_suspend(intf); | |
32a69589 | 5258 | out_hdev_lock: |
eb6e2924 | 5259 | usb_unlock_device(hdev); |
1da177e4 | 5260 | |
32a69589 PM |
5261 | /* Balance the stuff in kick_hub_wq() and allow autosuspend */ |
5262 | usb_autopm_put_interface(intf); | |
5263 | kref_put(&hub->kref, hub_release); | |
1da177e4 LT |
5264 | } |
5265 | ||
1e927d96 | 5266 | static const struct usb_device_id hub_id_table[] = { |
e6f30dea | 5267 | { .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
469271f8 | 5268 | | USB_DEVICE_ID_MATCH_INT_CLASS, |
e6f30dea ML |
5269 | .idVendor = USB_VENDOR_GENESYS_LOGIC, |
5270 | .bInterfaceClass = USB_CLASS_HUB, | |
5271 | .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, | |
1da177e4 LT |
5272 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
5273 | .bDeviceClass = USB_CLASS_HUB}, | |
5274 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
5275 | .bInterfaceClass = USB_CLASS_HUB}, | |
5276 | { } /* Terminating entry */ | |
5277 | }; | |
5278 | ||
039b3307 | 5279 | MODULE_DEVICE_TABLE(usb, hub_id_table); |
1da177e4 LT |
5280 | |
5281 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
5282 | .name = "hub", |
5283 | .probe = hub_probe, | |
5284 | .disconnect = hub_disconnect, | |
5285 | .suspend = hub_suspend, | |
5286 | .resume = hub_resume, | |
f07600cf | 5287 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
5288 | .pre_reset = hub_pre_reset, |
5289 | .post_reset = hub_post_reset, | |
c532b29a | 5290 | .unlocked_ioctl = hub_ioctl, |
1da177e4 | 5291 | .id_table = hub_id_table, |
40f122f3 | 5292 | .supports_autosuspend = 1, |
1da177e4 LT |
5293 | }; |
5294 | ||
5295 | int usb_hub_init(void) | |
5296 | { | |
1da177e4 LT |
5297 | if (usb_register(&hub_driver) < 0) { |
5298 | printk(KERN_ERR "%s: can't register hub driver\n", | |
5299 | usbcore_name); | |
5300 | return -1; | |
5301 | } | |
5302 | ||
32a69589 PM |
5303 | /* |
5304 | * The workqueue needs to be freezable to avoid interfering with | |
5305 | * USB-PERSIST port handover. Otherwise it might see that a full-speed | |
5306 | * device was gone before the EHCI controller had handed its port | |
5307 | * over to the companion full-speed controller. | |
32a69589 | 5308 | */ |
638139eb | 5309 | hub_wq = alloc_workqueue("usb_hub_wq", WQ_FREEZABLE, 0); |
32a69589 | 5310 | if (hub_wq) |
1da177e4 | 5311 | return 0; |
1da177e4 LT |
5312 | |
5313 | /* Fall through if kernel_thread failed */ | |
5314 | usb_deregister(&hub_driver); | |
32a69589 | 5315 | pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name); |
1da177e4 LT |
5316 | |
5317 | return -1; | |
5318 | } | |
5319 | ||
5320 | void usb_hub_cleanup(void) | |
5321 | { | |
32a69589 | 5322 | destroy_workqueue(hub_wq); |
1da177e4 LT |
5323 | |
5324 | /* | |
5325 | * Hub resources are freed for us by usb_deregister. It calls | |
5326 | * usb_driver_purge on every device which in turn calls that | |
5327 | * devices disconnect function if it is using this driver. | |
5328 | * The hub_disconnect function takes care of releasing the | |
5329 | * individual hub resources. -greg | |
5330 | */ | |
5331 | usb_deregister(&hub_driver); | |
5332 | } /* usb_hub_cleanup() */ | |
5333 | ||
eb764c4b | 5334 | static int descriptors_changed(struct usb_device *udev, |
e3376d6c XR |
5335 | struct usb_device_descriptor *old_device_descriptor, |
5336 | struct usb_host_bos *old_bos) | |
eb764c4b AS |
5337 | { |
5338 | int changed = 0; | |
5339 | unsigned index; | |
5340 | unsigned serial_len = 0; | |
5341 | unsigned len; | |
5342 | unsigned old_length; | |
5343 | int length; | |
5344 | char *buf; | |
5345 | ||
5346 | if (memcmp(&udev->descriptor, old_device_descriptor, | |
5347 | sizeof(*old_device_descriptor)) != 0) | |
5348 | return 1; | |
5349 | ||
e3376d6c XR |
5350 | if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) |
5351 | return 1; | |
5352 | if (udev->bos) { | |
b9a10481 XR |
5353 | len = le16_to_cpu(udev->bos->desc->wTotalLength); |
5354 | if (len != le16_to_cpu(old_bos->desc->wTotalLength)) | |
e3376d6c | 5355 | return 1; |
b9a10481 | 5356 | if (memcmp(udev->bos->desc, old_bos->desc, len)) |
e3376d6c XR |
5357 | return 1; |
5358 | } | |
5359 | ||
eb764c4b AS |
5360 | /* Since the idVendor, idProduct, and bcdDevice values in the |
5361 | * device descriptor haven't changed, we will assume the | |
5362 | * Manufacturer and Product strings haven't changed either. | |
5363 | * But the SerialNumber string could be different (e.g., a | |
5364 | * different flash card of the same brand). | |
5365 | */ | |
5366 | if (udev->serial) | |
5367 | serial_len = strlen(udev->serial) + 1; | |
1da177e4 | 5368 | |
eb764c4b | 5369 | len = serial_len; |
1da177e4 | 5370 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b AS |
5371 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
5372 | len = max(len, old_length); | |
1da177e4 | 5373 | } |
eb764c4b | 5374 | |
0cc1a51f | 5375 | buf = kmalloc(len, GFP_NOIO); |
b74e7062 | 5376 | if (!buf) |
1da177e4 LT |
5377 | /* assume the worst */ |
5378 | return 1; | |
b74e7062 | 5379 | |
1da177e4 | 5380 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b | 5381 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
1da177e4 LT |
5382 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
5383 | old_length); | |
eb764c4b | 5384 | if (length != old_length) { |
1da177e4 LT |
5385 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
5386 | index, length); | |
eb764c4b | 5387 | changed = 1; |
1da177e4 LT |
5388 | break; |
5389 | } | |
039b3307 | 5390 | if (memcmp(buf, udev->rawdescriptors[index], old_length) |
1da177e4 LT |
5391 | != 0) { |
5392 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
eb764c4b AS |
5393 | index, |
5394 | ((struct usb_config_descriptor *) buf)-> | |
5395 | bConfigurationValue); | |
5396 | changed = 1; | |
1da177e4 LT |
5397 | break; |
5398 | } | |
5399 | } | |
eb764c4b AS |
5400 | |
5401 | if (!changed && serial_len) { | |
5402 | length = usb_string(udev, udev->descriptor.iSerialNumber, | |
5403 | buf, serial_len); | |
5404 | if (length + 1 != serial_len) { | |
5405 | dev_dbg(&udev->dev, "serial string error %d\n", | |
5406 | length); | |
5407 | changed = 1; | |
5408 | } else if (memcmp(buf, udev->serial, length) != 0) { | |
5409 | dev_dbg(&udev->dev, "serial string changed\n"); | |
5410 | changed = 1; | |
5411 | } | |
5412 | } | |
5413 | ||
1da177e4 | 5414 | kfree(buf); |
eb764c4b | 5415 | return changed; |
1da177e4 LT |
5416 | } |
5417 | ||
5418 | /** | |
742120c6 | 5419 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
1da177e4 LT |
5420 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
5421 | * | |
79efa097 AS |
5422 | * WARNING - don't use this routine to reset a composite device |
5423 | * (one with multiple interfaces owned by separate drivers)! | |
742120c6 | 5424 | * Use usb_reset_device() instead. |
1da177e4 LT |
5425 | * |
5426 | * Do a port reset, reassign the device's address, and establish its | |
5427 | * former operating configuration. If the reset fails, or the device's | |
5428 | * descriptors change from their values before the reset, or the original | |
5429 | * configuration and altsettings cannot be restored, a flag will be set | |
37ebb549 | 5430 | * telling hub_wq to pretend the device has been disconnected and then |
1da177e4 LT |
5431 | * re-connected. All drivers will be unbound, and the device will be |
5432 | * re-enumerated and probed all over again. | |
5433 | * | |
626f090c | 5434 | * Return: 0 if the reset succeeded, -ENODEV if the device has been |
1da177e4 LT |
5435 | * flagged for logical disconnection, or some other negative error code |
5436 | * if the reset wasn't even attempted. | |
5437 | * | |
626f090c | 5438 | * Note: |
5c79a1e3 DW |
5439 | * The caller must own the device lock and the port lock, the latter is |
5440 | * taken by usb_reset_device(). For example, it's safe to use | |
5441 | * usb_reset_device() from a driver probe() routine after downloading | |
5442 | * new firmware. For calls that might not occur during probe(), drivers | |
5443 | * should lock the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
5444 | * |
5445 | * Locking exception: This routine may also be called from within an | |
5446 | * autoresume handler. Such usage won't conflict with other tasks | |
5447 | * holding the device lock because these tasks should always call | |
5c79a1e3 DW |
5448 | * usb_autopm_resume_device(), thereby preventing any unwanted |
5449 | * autoresume. The autoresume handler is expected to have already | |
5450 | * acquired the port lock before calling this routine. | |
1da177e4 | 5451 | */ |
742120c6 | 5452 | static int usb_reset_and_verify_device(struct usb_device *udev) |
1da177e4 LT |
5453 | { |
5454 | struct usb_device *parent_hdev = udev->parent; | |
5455 | struct usb_hub *parent_hub; | |
3f0479e0 | 5456 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 5457 | struct usb_device_descriptor descriptor = udev->descriptor; |
e3376d6c | 5458 | struct usb_host_bos *bos; |
7a7b562d | 5459 | int i, j, ret = 0; |
12c3da34 | 5460 | int port1 = udev->portnum; |
1da177e4 LT |
5461 | |
5462 | if (udev->state == USB_STATE_NOTATTACHED || | |
5463 | udev->state == USB_STATE_SUSPENDED) { | |
5464 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5465 | udev->state); | |
5466 | return -EINVAL; | |
5467 | } | |
5468 | ||
5c79a1e3 | 5469 | if (!parent_hdev) |
1da177e4 | 5470 | return -EISDIR; |
5c79a1e3 | 5471 | |
ad493e5e | 5472 | parent_hub = usb_hub_to_struct_hub(parent_hdev); |
1da177e4 | 5473 | |
dcc01c08 SS |
5474 | /* Disable USB2 hardware LPM. |
5475 | * It will be re-enabled by the enumeration process. | |
5476 | */ | |
5477 | if (udev->usb2_hw_lpm_enabled == 1) | |
5478 | usb_set_usb2_hardware_lpm(udev, 0); | |
5479 | ||
f74631e3 SS |
5480 | /* Disable LPM and LTM while we reset the device and reinstall the alt |
5481 | * settings. Device-initiated LPM settings, and system exit latency | |
5482 | * settings are cleared when the device is reset, so we have to set | |
5483 | * them up again. | |
6d1d0513 SS |
5484 | */ |
5485 | ret = usb_unlocked_disable_lpm(udev); | |
5486 | if (ret) { | |
5487 | dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); | |
464ad8c4 | 5488 | goto re_enumerate_no_bos; |
6d1d0513 | 5489 | } |
f74631e3 SS |
5490 | ret = usb_disable_ltm(udev); |
5491 | if (ret) { | |
5492 | dev_err(&udev->dev, "%s Failed to disable LTM\n.", | |
5493 | __func__); | |
464ad8c4 | 5494 | goto re_enumerate_no_bos; |
f74631e3 | 5495 | } |
6d1d0513 | 5496 | |
464ad8c4 | 5497 | bos = udev->bos; |
e5bdfd50 | 5498 | udev->bos = NULL; |
464ad8c4 | 5499 | |
1da177e4 LT |
5500 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { |
5501 | ||
5502 | /* ep0 maxpacket size may change; let the HCD know about it. | |
5503 | * Other endpoints will be handled by re-enumeration. */ | |
fc721f51 | 5504 | usb_ep0_reinit(udev); |
1da177e4 | 5505 | ret = hub_port_init(parent_hub, udev, port1, i); |
dd4dd19e | 5506 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
5507 | break; |
5508 | } | |
d5cbad4b | 5509 | |
1da177e4 LT |
5510 | if (ret < 0) |
5511 | goto re_enumerate; | |
469271f8 | 5512 | |
1da177e4 | 5513 | /* Device might have changed firmware (DFU or similar) */ |
e3376d6c | 5514 | if (descriptors_changed(udev, &descriptor, bos)) { |
1da177e4 LT |
5515 | dev_info(&udev->dev, "device firmware changed\n"); |
5516 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
5517 | goto re_enumerate; | |
469271f8 | 5518 | } |
4fe0387a AS |
5519 | |
5520 | /* Restore the device's previous configuration */ | |
1da177e4 LT |
5521 | if (!udev->actconfig) |
5522 | goto done; | |
3f0479e0 | 5523 | |
d673bfcb | 5524 | mutex_lock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5525 | ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); |
5526 | if (ret < 0) { | |
5527 | dev_warn(&udev->dev, | |
5528 | "Busted HC? Not enough HCD resources for " | |
5529 | "old configuration.\n"); | |
d673bfcb | 5530 | mutex_unlock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5531 | goto re_enumerate; |
5532 | } | |
1da177e4 LT |
5533 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
5534 | USB_REQ_SET_CONFIGURATION, 0, | |
5535 | udev->actconfig->desc.bConfigurationValue, 0, | |
5536 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
5537 | if (ret < 0) { | |
5538 | dev_err(&udev->dev, | |
5539 | "can't restore configuration #%d (error=%d)\n", | |
5540 | udev->actconfig->desc.bConfigurationValue, ret); | |
d673bfcb | 5541 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 | 5542 | goto re_enumerate; |
469271f8 | 5543 | } |
d673bfcb | 5544 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 LT |
5545 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
5546 | ||
4fe0387a AS |
5547 | /* Put interfaces back into the same altsettings as before. |
5548 | * Don't bother to send the Set-Interface request for interfaces | |
5549 | * that were already in altsetting 0; besides being unnecessary, | |
5550 | * many devices can't handle it. Instead just reset the host-side | |
5551 | * endpoint state. | |
5552 | */ | |
1da177e4 | 5553 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
3f0479e0 SS |
5554 | struct usb_host_config *config = udev->actconfig; |
5555 | struct usb_interface *intf = config->interface[i]; | |
1da177e4 LT |
5556 | struct usb_interface_descriptor *desc; |
5557 | ||
1da177e4 | 5558 | desc = &intf->cur_altsetting->desc; |
4fe0387a AS |
5559 | if (desc->bAlternateSetting == 0) { |
5560 | usb_disable_interface(udev, intf, true); | |
5561 | usb_enable_interface(udev, intf, true); | |
5562 | ret = 0; | |
5563 | } else { | |
04a723ea SS |
5564 | /* Let the bandwidth allocation function know that this |
5565 | * device has been reset, and it will have to use | |
5566 | * alternate setting 0 as the current alternate setting. | |
3f0479e0 | 5567 | */ |
04a723ea | 5568 | intf->resetting_device = 1; |
4fe0387a AS |
5569 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
5570 | desc->bAlternateSetting); | |
04a723ea | 5571 | intf->resetting_device = 0; |
4fe0387a | 5572 | } |
1da177e4 LT |
5573 | if (ret < 0) { |
5574 | dev_err(&udev->dev, "failed to restore interface %d " | |
5575 | "altsetting %d (error=%d)\n", | |
5576 | desc->bInterfaceNumber, | |
5577 | desc->bAlternateSetting, | |
5578 | ret); | |
5579 | goto re_enumerate; | |
5580 | } | |
7a7b562d HG |
5581 | /* Resetting also frees any allocated streams */ |
5582 | for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) | |
5583 | intf->cur_altsetting->endpoint[j].streams = 0; | |
1da177e4 LT |
5584 | } |
5585 | ||
5586 | done: | |
f74631e3 | 5587 | /* Now that the alt settings are re-installed, enable LTM and LPM. */ |
de68bab4 | 5588 | usb_set_usb2_hardware_lpm(udev, 1); |
8306095f | 5589 | usb_unlocked_enable_lpm(udev); |
f74631e3 | 5590 | usb_enable_ltm(udev); |
e5bdfd50 GKH |
5591 | usb_release_bos_descriptor(udev); |
5592 | udev->bos = bos; | |
1da177e4 | 5593 | return 0; |
469271f8 | 5594 | |
1da177e4 | 5595 | re_enumerate: |
e3376d6c XR |
5596 | usb_release_bos_descriptor(udev); |
5597 | udev->bos = bos; | |
464ad8c4 HY |
5598 | re_enumerate_no_bos: |
5599 | /* LPM state doesn't matter when we're about to destroy the device. */ | |
5600 | hub_port_logical_disconnect(parent_hub, port1); | |
1da177e4 LT |
5601 | return -ENODEV; |
5602 | } | |
79efa097 AS |
5603 | |
5604 | /** | |
742120c6 | 5605 | * usb_reset_device - warn interface drivers and perform a USB port reset |
79efa097 | 5606 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
79efa097 AS |
5607 | * |
5608 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
5609 | * method), performs the port reset, and then lets the drivers know that | |
5610 | * the reset is over (using their post_reset method). | |
5611 | * | |
626f090c | 5612 | * Return: The same as for usb_reset_and_verify_device(). |
79efa097 | 5613 | * |
626f090c | 5614 | * Note: |
79efa097 AS |
5615 | * The caller must own the device lock. For example, it's safe to use |
5616 | * this from a driver probe() routine after downloading new firmware. | |
5617 | * For calls that might not occur during probe(), drivers should lock | |
5618 | * the device using usb_lock_device_for_reset(). | |
78d9a487 AS |
5619 | * |
5620 | * If an interface is currently being probed or disconnected, we assume | |
5621 | * its driver knows how to handle resets. For all other interfaces, | |
5622 | * if the driver doesn't have pre_reset and post_reset methods then | |
5623 | * we attempt to unbind it and rebind afterward. | |
79efa097 | 5624 | */ |
742120c6 | 5625 | int usb_reset_device(struct usb_device *udev) |
79efa097 AS |
5626 | { |
5627 | int ret; | |
852c4b43 | 5628 | int i; |
4d769def | 5629 | unsigned int noio_flag; |
5c79a1e3 | 5630 | struct usb_port *port_dev; |
79efa097 | 5631 | struct usb_host_config *config = udev->actconfig; |
5c79a1e3 | 5632 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
79efa097 AS |
5633 | |
5634 | if (udev->state == USB_STATE_NOTATTACHED || | |
5635 | udev->state == USB_STATE_SUSPENDED) { | |
5636 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5637 | udev->state); | |
5638 | return -EINVAL; | |
5639 | } | |
5640 | ||
5c79a1e3 DW |
5641 | if (!udev->parent) { |
5642 | /* this requires hcd-specific logic; see ohci_restart() */ | |
5643 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); | |
5644 | return -EISDIR; | |
5645 | } | |
5646 | ||
5647 | port_dev = hub->ports[udev->portnum - 1]; | |
5648 | ||
4d769def ML |
5649 | /* |
5650 | * Don't allocate memory with GFP_KERNEL in current | |
5651 | * context to avoid possible deadlock if usb mass | |
5652 | * storage interface or usbnet interface(iSCSI case) | |
5653 | * is included in current configuration. The easist | |
5654 | * approach is to do it for every device reset, | |
5655 | * because the device 'memalloc_noio' flag may have | |
5656 | * not been set before reseting the usb device. | |
5657 | */ | |
5658 | noio_flag = memalloc_noio_save(); | |
5659 | ||
645daaab | 5660 | /* Prevent autosuspend during the reset */ |
94fcda1f | 5661 | usb_autoresume_device(udev); |
645daaab | 5662 | |
79efa097 | 5663 | if (config) { |
79efa097 | 5664 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
852c4b43 AS |
5665 | struct usb_interface *cintf = config->interface[i]; |
5666 | struct usb_driver *drv; | |
78d9a487 | 5667 | int unbind = 0; |
852c4b43 AS |
5668 | |
5669 | if (cintf->dev.driver) { | |
79efa097 | 5670 | drv = to_usb_driver(cintf->dev.driver); |
78d9a487 AS |
5671 | if (drv->pre_reset && drv->post_reset) |
5672 | unbind = (drv->pre_reset)(cintf); | |
5673 | else if (cintf->condition == | |
5674 | USB_INTERFACE_BOUND) | |
5675 | unbind = 1; | |
5676 | if (unbind) | |
5677 | usb_forced_unbind_intf(cintf); | |
79efa097 AS |
5678 | } |
5679 | } | |
5680 | } | |
5681 | ||
5c79a1e3 | 5682 | usb_lock_port(port_dev); |
742120c6 | 5683 | ret = usb_reset_and_verify_device(udev); |
5c79a1e3 | 5684 | usb_unlock_port(port_dev); |
79efa097 AS |
5685 | |
5686 | if (config) { | |
79efa097 | 5687 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
852c4b43 AS |
5688 | struct usb_interface *cintf = config->interface[i]; |
5689 | struct usb_driver *drv; | |
78d9a487 | 5690 | int rebind = cintf->needs_binding; |
852c4b43 | 5691 | |
78d9a487 | 5692 | if (!rebind && cintf->dev.driver) { |
79efa097 AS |
5693 | drv = to_usb_driver(cintf->dev.driver); |
5694 | if (drv->post_reset) | |
78d9a487 AS |
5695 | rebind = (drv->post_reset)(cintf); |
5696 | else if (cintf->condition == | |
5697 | USB_INTERFACE_BOUND) | |
5698 | rebind = 1; | |
6aec044c AS |
5699 | if (rebind) |
5700 | cintf->needs_binding = 1; | |
79efa097 | 5701 | } |
79efa097 | 5702 | } |
6aec044c | 5703 | usb_unbind_and_rebind_marked_interfaces(udev); |
79efa097 AS |
5704 | } |
5705 | ||
94fcda1f | 5706 | usb_autosuspend_device(udev); |
4d769def | 5707 | memalloc_noio_restore(noio_flag); |
79efa097 AS |
5708 | return ret; |
5709 | } | |
742120c6 | 5710 | EXPORT_SYMBOL_GPL(usb_reset_device); |
dc023dce IPG |
5711 | |
5712 | ||
5713 | /** | |
5714 | * usb_queue_reset_device - Reset a USB device from an atomic context | |
5715 | * @iface: USB interface belonging to the device to reset | |
5716 | * | |
5717 | * This function can be used to reset a USB device from an atomic | |
5718 | * context, where usb_reset_device() won't work (as it blocks). | |
5719 | * | |
5720 | * Doing a reset via this method is functionally equivalent to calling | |
5721 | * usb_reset_device(), except for the fact that it is delayed to a | |
5722 | * workqueue. This means that any drivers bound to other interfaces | |
5723 | * might be unbound, as well as users from usbfs in user space. | |
5724 | * | |
5725 | * Corner cases: | |
5726 | * | |
5727 | * - Scheduling two resets at the same time from two different drivers | |
5728 | * attached to two different interfaces of the same device is | |
5729 | * possible; depending on how the driver attached to each interface | |
5730 | * handles ->pre_reset(), the second reset might happen or not. | |
5731 | * | |
524134d4 AS |
5732 | * - If the reset is delayed so long that the interface is unbound from |
5733 | * its driver, the reset will be skipped. | |
dc023dce | 5734 | * |
524134d4 AS |
5735 | * - This function can be called during .probe(). It can also be called |
5736 | * during .disconnect(), but doing so is pointless because the reset | |
5737 | * will not occur. If you really want to reset the device during | |
5738 | * .disconnect(), call usb_reset_device() directly -- but watch out | |
5739 | * for nested unbinding issues! | |
dc023dce IPG |
5740 | */ |
5741 | void usb_queue_reset_device(struct usb_interface *iface) | |
5742 | { | |
524134d4 AS |
5743 | if (schedule_work(&iface->reset_ws)) |
5744 | usb_get_intf(iface); | |
dc023dce IPG |
5745 | } |
5746 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); | |
ff823c79 LT |
5747 | |
5748 | /** | |
5749 | * usb_hub_find_child - Get the pointer of child device | |
5750 | * attached to the port which is specified by @port1. | |
5751 | * @hdev: USB device belonging to the usb hub | |
5752 | * @port1: port num to indicate which port the child device | |
5753 | * is attached to. | |
5754 | * | |
5755 | * USB drivers call this function to get hub's child device | |
5756 | * pointer. | |
5757 | * | |
626f090c | 5758 | * Return: %NULL if input param is invalid and |
ff823c79 LT |
5759 | * child's usb_device pointer if non-NULL. |
5760 | */ | |
5761 | struct usb_device *usb_hub_find_child(struct usb_device *hdev, | |
5762 | int port1) | |
5763 | { | |
ad493e5e | 5764 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
ff823c79 LT |
5765 | |
5766 | if (port1 < 1 || port1 > hdev->maxchild) | |
5767 | return NULL; | |
5768 | return hub->ports[port1 - 1]->child; | |
5769 | } | |
5770 | EXPORT_SYMBOL_GPL(usb_hub_find_child); | |
d5575424 | 5771 | |
d2123fd9 LT |
5772 | void usb_hub_adjust_deviceremovable(struct usb_device *hdev, |
5773 | struct usb_hub_descriptor *desc) | |
5774 | { | |
d99f6b41 | 5775 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
d2123fd9 LT |
5776 | enum usb_port_connect_type connect_type; |
5777 | int i; | |
5778 | ||
d99f6b41 DW |
5779 | if (!hub) |
5780 | return; | |
5781 | ||
d2123fd9 LT |
5782 | if (!hub_is_superspeed(hdev)) { |
5783 | for (i = 1; i <= hdev->maxchild; i++) { | |
d99f6b41 | 5784 | struct usb_port *port_dev = hub->ports[i - 1]; |
d2123fd9 | 5785 | |
d99f6b41 | 5786 | connect_type = port_dev->connect_type; |
d2123fd9 LT |
5787 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
5788 | u8 mask = 1 << (i%8); | |
5789 | ||
5790 | if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { | |
d99f6b41 | 5791 | dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
d2123fd9 LT |
5792 | desc->u.hs.DeviceRemovable[i/8] |= mask; |
5793 | } | |
5794 | } | |
5795 | } | |
5796 | } else { | |
5797 | u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); | |
5798 | ||
5799 | for (i = 1; i <= hdev->maxchild; i++) { | |
d99f6b41 | 5800 | struct usb_port *port_dev = hub->ports[i - 1]; |
d2123fd9 | 5801 | |
d99f6b41 | 5802 | connect_type = port_dev->connect_type; |
d2123fd9 LT |
5803 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
5804 | u16 mask = 1 << i; | |
5805 | ||
5806 | if (!(port_removable & mask)) { | |
d99f6b41 | 5807 | dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
d2123fd9 LT |
5808 | port_removable |= mask; |
5809 | } | |
5810 | } | |
5811 | } | |
5812 | ||
5813 | desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); | |
5814 | } | |
5815 | } | |
5816 | ||
d5575424 LT |
5817 | #ifdef CONFIG_ACPI |
5818 | /** | |
5819 | * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle | |
5820 | * @hdev: USB device belonging to the usb hub | |
5821 | * @port1: port num of the port | |
5822 | * | |
626f090c YB |
5823 | * Return: Port's acpi handle if successful, %NULL if params are |
5824 | * invalid. | |
d5575424 LT |
5825 | */ |
5826 | acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, | |
5827 | int port1) | |
5828 | { | |
ad493e5e | 5829 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
d5575424 | 5830 | |
41341261 MN |
5831 | if (!hub) |
5832 | return NULL; | |
5833 | ||
3a83f992 | 5834 | return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); |
d5575424 LT |
5835 | } |
5836 | #endif |