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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * USB hub driver. | |
3 | * | |
4 | * (C) Copyright 1999 Linus Torvalds | |
5 | * (C) Copyright 1999 Johannes Erdfelt | |
6 | * (C) Copyright 1999 Gregory P. Smith | |
7 | * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) | |
8 | * | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/completion.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/slab.h> | |
1da177e4 LT |
19 | #include <linux/ioctl.h> |
20 | #include <linux/usb.h> | |
21 | #include <linux/usbdevice_fs.h> | |
27729aad | 22 | #include <linux/usb/hcd.h> |
925aa46b | 23 | #include <linux/usb/otg.h> |
93362a87 | 24 | #include <linux/usb/quirks.h> |
32a69589 | 25 | #include <linux/workqueue.h> |
4186ecf8 | 26 | #include <linux/mutex.h> |
b04b3156 | 27 | #include <linux/random.h> |
ad493e5e | 28 | #include <linux/pm_qos.h> |
1da177e4 | 29 | |
1da177e4 LT |
30 | #include <asm/uaccess.h> |
31 | #include <asm/byteorder.h> | |
32 | ||
6e30d7cb | 33 | #include "hub.h" |
026f3fcb | 34 | #include "otg_whitelist.h" |
1da177e4 | 35 | |
e6f30dea ML |
36 | #define USB_VENDOR_GENESYS_LOGIC 0x05e3 |
37 | #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 | |
38 | ||
fa286188 | 39 | /* Protect struct usb_device->state and ->children members |
9ad3d6cc | 40 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
41 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
42 | static DEFINE_SPINLOCK(device_state_lock); | |
43 | ||
32a69589 PM |
44 | /* workqueue to process hub events */ |
45 | static struct workqueue_struct *hub_wq; | |
46 | static void hub_event(struct work_struct *work); | |
1da177e4 | 47 | |
d8521afe DW |
48 | /* synchronize hub-port add/remove and peering operations */ |
49 | DEFINE_MUTEX(usb_port_peer_mutex); | |
50 | ||
1da177e4 | 51 | /* cycle leds on hubs that aren't blinking for attention */ |
a44007a4 | 52 | static bool blinkenlights; |
166b8639 CM |
53 | module_param(blinkenlights, bool, S_IRUGO); |
54 | MODULE_PARM_DESC(blinkenlights, "true to cycle leds on hubs"); | |
1da177e4 | 55 | |
fd7c519d JK |
56 | /* |
57 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about | |
58 | * 10 seconds to send reply for the initial 64-byte descriptor request. | |
59 | */ | |
60 | /* define initial 64-byte descriptor request timeout in milliseconds */ | |
61 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; | |
62 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); | |
b9cef6c3 WF |
63 | MODULE_PARM_DESC(initial_descriptor_timeout, |
64 | "initial 64-byte descriptor request timeout in milliseconds " | |
65 | "(default 5000 - 5.0 seconds)"); | |
fd7c519d | 66 | |
1da177e4 LT |
67 | /* |
68 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
69 | * closely resembles the way Windows works. Hopefully it will be compatible | |
70 | * with a wider range of devices than the old scheme. However some previously | |
71 | * working devices may start giving rise to "device not accepting address" | |
72 | * errors; if that happens the user can try the old scheme by adjusting the | |
73 | * following module parameters. | |
74 | * | |
75 | * For maximum flexibility there are two boolean parameters to control the | |
76 | * hub driver's behavior. On the first initialization attempt, if the | |
77 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
78 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
79 | * is set, then the driver will make another attempt, using the other scheme. | |
80 | */ | |
a44007a4 | 81 | static bool old_scheme_first; |
1da177e4 LT |
82 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); |
83 | MODULE_PARM_DESC(old_scheme_first, | |
84 | "start with the old device initialization scheme"); | |
85 | ||
90ab5ee9 | 86 | static bool use_both_schemes = 1; |
1da177e4 LT |
87 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); |
88 | MODULE_PARM_DESC(use_both_schemes, | |
89 | "try the other device initialization scheme if the " | |
90 | "first one fails"); | |
91 | ||
32fe0198 AS |
92 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
93 | * port reset on some companion controllers. | |
94 | */ | |
95 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); | |
96 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); | |
97 | ||
ad493e5e | 98 | #define HUB_DEBOUNCE_TIMEOUT 2000 |
948fea37 AS |
99 | #define HUB_DEBOUNCE_STEP 25 |
100 | #define HUB_DEBOUNCE_STABLE 100 | |
101 | ||
32a69589 | 102 | static void hub_release(struct kref *kref); |
742120c6 ML |
103 | static int usb_reset_and_verify_device(struct usb_device *udev); |
104 | ||
131dec34 | 105 | static inline char *portspeed(struct usb_hub *hub, int portstatus) |
1da177e4 | 106 | { |
d64aab0c ON |
107 | if (hub_is_superspeedplus(hub->hdev)) |
108 | return "10.0 Gb/s"; | |
131dec34 SS |
109 | if (hub_is_superspeed(hub->hdev)) |
110 | return "5.0 Gb/s"; | |
288ead45 | 111 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
469271f8 | 112 | return "480 Mb/s"; |
288ead45 | 113 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
1da177e4 LT |
114 | return "1.5 Mb/s"; |
115 | else | |
116 | return "12 Mb/s"; | |
117 | } | |
1da177e4 LT |
118 | |
119 | /* Note that hdev or one of its children must be locked! */ | |
ad493e5e | 120 | struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) |
1da177e4 | 121 | { |
ff823c79 | 122 | if (!hdev || !hdev->actconfig || !hdev->maxchild) |
25118084 | 123 | return NULL; |
1da177e4 LT |
124 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
125 | } | |
126 | ||
2d2a3167 | 127 | int usb_device_supports_lpm(struct usb_device *udev) |
d9b2099c | 128 | { |
ad87e032 AS |
129 | /* Some devices have trouble with LPM */ |
130 | if (udev->quirks & USB_QUIRK_NO_LPM) | |
131 | return 0; | |
132 | ||
d9b2099c SS |
133 | /* USB 2.1 (and greater) devices indicate LPM support through |
134 | * their USB 2.0 Extended Capabilities BOS descriptor. | |
135 | */ | |
a8425292 | 136 | if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) { |
d9b2099c SS |
137 | if (udev->bos->ext_cap && |
138 | (USB_LPM_SUPPORT & | |
139 | le32_to_cpu(udev->bos->ext_cap->bmAttributes))) | |
140 | return 1; | |
141 | return 0; | |
142 | } | |
51e0a012 | 143 | |
25cd2882 SS |
144 | /* |
145 | * According to the USB 3.0 spec, all USB 3.0 devices must support LPM. | |
146 | * However, there are some that don't, and they set the U1/U2 exit | |
147 | * latencies to zero. | |
51e0a012 SS |
148 | */ |
149 | if (!udev->bos->ss_cap) { | |
25cd2882 | 150 | dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); |
51e0a012 SS |
151 | return 0; |
152 | } | |
51e0a012 | 153 | |
25cd2882 SS |
154 | if (udev->bos->ss_cap->bU1devExitLat == 0 && |
155 | udev->bos->ss_cap->bU2DevExitLat == 0) { | |
156 | if (udev->parent) | |
157 | dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); | |
158 | else | |
159 | dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); | |
51e0a012 SS |
160 | return 0; |
161 | } | |
51e0a012 | 162 | |
25cd2882 SS |
163 | if (!udev->parent || udev->parent->lpm_capable) |
164 | return 1; | |
d9b2099c SS |
165 | return 0; |
166 | } | |
167 | ||
51e0a012 SS |
168 | /* |
169 | * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from | |
170 | * either U1 or U2. | |
171 | */ | |
172 | static void usb_set_lpm_mel(struct usb_device *udev, | |
173 | struct usb3_lpm_parameters *udev_lpm_params, | |
174 | unsigned int udev_exit_latency, | |
175 | struct usb_hub *hub, | |
176 | struct usb3_lpm_parameters *hub_lpm_params, | |
177 | unsigned int hub_exit_latency) | |
178 | { | |
179 | unsigned int total_mel; | |
180 | unsigned int device_mel; | |
181 | unsigned int hub_mel; | |
182 | ||
183 | /* | |
184 | * Calculate the time it takes to transition all links from the roothub | |
185 | * to the parent hub into U0. The parent hub must then decode the | |
186 | * packet (hub header decode latency) to figure out which port it was | |
187 | * bound for. | |
188 | * | |
189 | * The Hub Header decode latency is expressed in 0.1us intervals (0x1 | |
190 | * means 0.1us). Multiply that by 100 to get nanoseconds. | |
191 | */ | |
192 | total_mel = hub_lpm_params->mel + | |
193 | (hub->descriptor->u.ss.bHubHdrDecLat * 100); | |
194 | ||
195 | /* | |
196 | * How long will it take to transition the downstream hub's port into | |
197 | * U0? The greater of either the hub exit latency or the device exit | |
198 | * latency. | |
199 | * | |
200 | * The BOS U1/U2 exit latencies are expressed in 1us intervals. | |
201 | * Multiply that by 1000 to get nanoseconds. | |
202 | */ | |
203 | device_mel = udev_exit_latency * 1000; | |
204 | hub_mel = hub_exit_latency * 1000; | |
205 | if (device_mel > hub_mel) | |
206 | total_mel += device_mel; | |
207 | else | |
208 | total_mel += hub_mel; | |
209 | ||
210 | udev_lpm_params->mel = total_mel; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate | |
215 | * a transition from either U1 or U2. | |
216 | */ | |
217 | static void usb_set_lpm_pel(struct usb_device *udev, | |
218 | struct usb3_lpm_parameters *udev_lpm_params, | |
219 | unsigned int udev_exit_latency, | |
220 | struct usb_hub *hub, | |
221 | struct usb3_lpm_parameters *hub_lpm_params, | |
222 | unsigned int hub_exit_latency, | |
223 | unsigned int port_to_port_exit_latency) | |
224 | { | |
225 | unsigned int first_link_pel; | |
226 | unsigned int hub_pel; | |
227 | ||
228 | /* | |
229 | * First, the device sends an LFPS to transition the link between the | |
230 | * device and the parent hub into U0. The exit latency is the bigger of | |
231 | * the device exit latency or the hub exit latency. | |
232 | */ | |
233 | if (udev_exit_latency > hub_exit_latency) | |
234 | first_link_pel = udev_exit_latency * 1000; | |
235 | else | |
236 | first_link_pel = hub_exit_latency * 1000; | |
237 | ||
238 | /* | |
239 | * When the hub starts to receive the LFPS, there is a slight delay for | |
240 | * it to figure out that one of the ports is sending an LFPS. Then it | |
241 | * will forward the LFPS to its upstream link. The exit latency is the | |
242 | * delay, plus the PEL that we calculated for this hub. | |
243 | */ | |
244 | hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; | |
245 | ||
246 | /* | |
247 | * According to figure C-7 in the USB 3.0 spec, the PEL for this device | |
248 | * is the greater of the two exit latencies. | |
249 | */ | |
250 | if (first_link_pel > hub_pel) | |
251 | udev_lpm_params->pel = first_link_pel; | |
252 | else | |
253 | udev_lpm_params->pel = hub_pel; | |
254 | } | |
255 | ||
256 | /* | |
257 | * Set the System Exit Latency (SEL) to indicate the total worst-case time from | |
258 | * when a device initiates a transition to U0, until when it will receive the | |
259 | * first packet from the host controller. | |
260 | * | |
261 | * Section C.1.5.1 describes the four components to this: | |
262 | * - t1: device PEL | |
263 | * - t2: time for the ERDY to make it from the device to the host. | |
264 | * - t3: a host-specific delay to process the ERDY. | |
265 | * - t4: time for the packet to make it from the host to the device. | |
266 | * | |
267 | * t3 is specific to both the xHCI host and the platform the host is integrated | |
268 | * into. The Intel HW folks have said it's negligible, FIXME if a different | |
269 | * vendor says otherwise. | |
270 | */ | |
271 | static void usb_set_lpm_sel(struct usb_device *udev, | |
272 | struct usb3_lpm_parameters *udev_lpm_params) | |
273 | { | |
274 | struct usb_device *parent; | |
275 | unsigned int num_hubs; | |
276 | unsigned int total_sel; | |
277 | ||
278 | /* t1 = device PEL */ | |
279 | total_sel = udev_lpm_params->pel; | |
280 | /* How many external hubs are in between the device & the root port. */ | |
281 | for (parent = udev->parent, num_hubs = 0; parent->parent; | |
282 | parent = parent->parent) | |
283 | num_hubs++; | |
284 | /* t2 = 2.1us + 250ns * (num_hubs - 1) */ | |
285 | if (num_hubs > 0) | |
286 | total_sel += 2100 + 250 * (num_hubs - 1); | |
287 | ||
288 | /* t4 = 250ns * num_hubs */ | |
289 | total_sel += 250 * num_hubs; | |
290 | ||
291 | udev_lpm_params->sel = total_sel; | |
292 | } | |
293 | ||
294 | static void usb_set_lpm_parameters(struct usb_device *udev) | |
295 | { | |
296 | struct usb_hub *hub; | |
297 | unsigned int port_to_port_delay; | |
298 | unsigned int udev_u1_del; | |
299 | unsigned int udev_u2_del; | |
300 | unsigned int hub_u1_del; | |
301 | unsigned int hub_u2_del; | |
302 | ||
8a1b2725 | 303 | if (!udev->lpm_capable || udev->speed < USB_SPEED_SUPER) |
51e0a012 SS |
304 | return; |
305 | ||
ad493e5e | 306 | hub = usb_hub_to_struct_hub(udev->parent); |
51e0a012 SS |
307 | /* It doesn't take time to transition the roothub into U0, since it |
308 | * doesn't have an upstream link. | |
309 | */ | |
310 | if (!hub) | |
311 | return; | |
312 | ||
313 | udev_u1_del = udev->bos->ss_cap->bU1devExitLat; | |
4d967995 | 314 | udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); |
51e0a012 | 315 | hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; |
4d967995 | 316 | hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); |
51e0a012 SS |
317 | |
318 | usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, | |
319 | hub, &udev->parent->u1_params, hub_u1_del); | |
320 | ||
321 | usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, | |
322 | hub, &udev->parent->u2_params, hub_u2_del); | |
323 | ||
324 | /* | |
325 | * Appendix C, section C.2.2.2, says that there is a slight delay from | |
326 | * when the parent hub notices the downstream port is trying to | |
327 | * transition to U0 to when the hub initiates a U0 transition on its | |
328 | * upstream port. The section says the delays are tPort2PortU1EL and | |
329 | * tPort2PortU2EL, but it doesn't define what they are. | |
330 | * | |
331 | * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking | |
332 | * about the same delays. Use the maximum delay calculations from those | |
333 | * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For | |
334 | * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I | |
335 | * assume the device exit latencies they are talking about are the hub | |
336 | * exit latencies. | |
337 | * | |
338 | * What do we do if the U2 exit latency is less than the U1 exit | |
339 | * latency? It's possible, although not likely... | |
340 | */ | |
341 | port_to_port_delay = 1; | |
342 | ||
343 | usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, | |
344 | hub, &udev->parent->u1_params, hub_u1_del, | |
345 | port_to_port_delay); | |
346 | ||
347 | if (hub_u2_del > hub_u1_del) | |
348 | port_to_port_delay = 1 + hub_u2_del - hub_u1_del; | |
349 | else | |
350 | port_to_port_delay = 1 + hub_u1_del; | |
351 | ||
352 | usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, | |
353 | hub, &udev->parent->u2_params, hub_u2_del, | |
354 | port_to_port_delay); | |
355 | ||
356 | /* Now that we've got PEL, calculate SEL. */ | |
357 | usb_set_lpm_sel(udev, &udev->u1_params); | |
358 | usb_set_lpm_sel(udev, &udev->u2_params); | |
359 | } | |
360 | ||
1da177e4 | 361 | /* USB 2.0 spec Section 11.24.4.5 */ |
dbe79bbe | 362 | static int get_hub_descriptor(struct usb_device *hdev, void *data) |
1da177e4 | 363 | { |
dbe79bbe JY |
364 | int i, ret, size; |
365 | unsigned dtype; | |
366 | ||
367 | if (hub_is_superspeed(hdev)) { | |
368 | dtype = USB_DT_SS_HUB; | |
369 | size = USB_DT_SS_HUB_SIZE; | |
370 | } else { | |
371 | dtype = USB_DT_HUB; | |
372 | size = sizeof(struct usb_hub_descriptor); | |
373 | } | |
1da177e4 LT |
374 | |
375 | for (i = 0; i < 3; i++) { | |
376 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
377 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
dbe79bbe | 378 | dtype << 8, 0, data, size, |
1da177e4 LT |
379 | USB_CTRL_GET_TIMEOUT); |
380 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) | |
381 | return ret; | |
382 | } | |
383 | return -EINVAL; | |
384 | } | |
385 | ||
386 | /* | |
387 | * USB 2.0 spec Section 11.24.2.1 | |
388 | */ | |
389 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
390 | { | |
391 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
392 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
393 | } | |
394 | ||
395 | /* | |
396 | * USB 2.0 spec Section 11.24.2.2 | |
397 | */ | |
ad493e5e | 398 | int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) |
1da177e4 LT |
399 | { |
400 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
401 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
402 | NULL, 0, 1000); | |
403 | } | |
404 | ||
405 | /* | |
406 | * USB 2.0 spec Section 11.24.2.13 | |
407 | */ | |
408 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
409 | { | |
410 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
411 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
412 | NULL, 0, 1000); | |
413 | } | |
414 | ||
d99f6b41 DW |
415 | static char *to_led_name(int selector) |
416 | { | |
417 | switch (selector) { | |
418 | case HUB_LED_AMBER: | |
419 | return "amber"; | |
420 | case HUB_LED_GREEN: | |
421 | return "green"; | |
422 | case HUB_LED_OFF: | |
423 | return "off"; | |
424 | case HUB_LED_AUTO: | |
425 | return "auto"; | |
426 | default: | |
427 | return "??"; | |
428 | } | |
429 | } | |
430 | ||
1da177e4 LT |
431 | /* |
432 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
433 | * for info about using port indicators | |
434 | */ | |
d99f6b41 | 435 | static void set_port_led(struct usb_hub *hub, int port1, int selector) |
1da177e4 | 436 | { |
d99f6b41 DW |
437 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
438 | int status; | |
439 | ||
440 | status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
1da177e4 | 441 | USB_PORT_FEAT_INDICATOR); |
d99f6b41 DW |
442 | dev_dbg(&port_dev->dev, "indicator %s status %d\n", |
443 | to_led_name(selector), status); | |
1da177e4 LT |
444 | } |
445 | ||
446 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
447 | ||
166b8639 | 448 | static void led_work(struct work_struct *work) |
1da177e4 | 449 | { |
c4028958 DH |
450 | struct usb_hub *hub = |
451 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
452 | struct usb_device *hdev = hub->hdev; |
453 | unsigned i; | |
454 | unsigned changed = 0; | |
455 | int cursor = -1; | |
456 | ||
457 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
458 | return; | |
459 | ||
3bbc47d8 | 460 | for (i = 0; i < hdev->maxchild; i++) { |
1da177e4 LT |
461 | unsigned selector, mode; |
462 | ||
463 | /* 30%-50% duty cycle */ | |
464 | ||
465 | switch (hub->indicator[i]) { | |
466 | /* cycle marker */ | |
467 | case INDICATOR_CYCLE: | |
468 | cursor = i; | |
469 | selector = HUB_LED_AUTO; | |
470 | mode = INDICATOR_AUTO; | |
471 | break; | |
472 | /* blinking green = sw attention */ | |
473 | case INDICATOR_GREEN_BLINK: | |
474 | selector = HUB_LED_GREEN; | |
475 | mode = INDICATOR_GREEN_BLINK_OFF; | |
476 | break; | |
477 | case INDICATOR_GREEN_BLINK_OFF: | |
478 | selector = HUB_LED_OFF; | |
479 | mode = INDICATOR_GREEN_BLINK; | |
480 | break; | |
481 | /* blinking amber = hw attention */ | |
482 | case INDICATOR_AMBER_BLINK: | |
483 | selector = HUB_LED_AMBER; | |
484 | mode = INDICATOR_AMBER_BLINK_OFF; | |
485 | break; | |
486 | case INDICATOR_AMBER_BLINK_OFF: | |
487 | selector = HUB_LED_OFF; | |
488 | mode = INDICATOR_AMBER_BLINK; | |
489 | break; | |
490 | /* blink green/amber = reserved */ | |
491 | case INDICATOR_ALT_BLINK: | |
492 | selector = HUB_LED_GREEN; | |
493 | mode = INDICATOR_ALT_BLINK_OFF; | |
494 | break; | |
495 | case INDICATOR_ALT_BLINK_OFF: | |
496 | selector = HUB_LED_AMBER; | |
497 | mode = INDICATOR_ALT_BLINK; | |
498 | break; | |
499 | default: | |
500 | continue; | |
501 | } | |
502 | if (selector != HUB_LED_AUTO) | |
503 | changed = 1; | |
504 | set_port_led(hub, i + 1, selector); | |
505 | hub->indicator[i] = mode; | |
506 | } | |
507 | if (!changed && blinkenlights) { | |
508 | cursor++; | |
3bbc47d8 | 509 | cursor %= hdev->maxchild; |
1da177e4 LT |
510 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); |
511 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
512 | changed++; | |
513 | } | |
514 | if (changed) | |
22f6a0f0 SD |
515 | queue_delayed_work(system_power_efficient_wq, |
516 | &hub->leds, LED_CYCLE_PERIOD); | |
1da177e4 LT |
517 | } |
518 | ||
519 | /* use a short timeout for hub/port status fetches */ | |
520 | #define USB_STS_TIMEOUT 1000 | |
521 | #define USB_STS_RETRIES 5 | |
522 | ||
523 | /* | |
524 | * USB 2.0 spec Section 11.24.2.6 | |
525 | */ | |
526 | static int get_hub_status(struct usb_device *hdev, | |
527 | struct usb_hub_status *data) | |
528 | { | |
529 | int i, status = -ETIMEDOUT; | |
530 | ||
3824c1dd LP |
531 | for (i = 0; i < USB_STS_RETRIES && |
532 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 LT |
533 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
534 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
535 | data, sizeof(*data), USB_STS_TIMEOUT); | |
536 | } | |
537 | return status; | |
538 | } | |
539 | ||
540 | /* | |
541 | * USB 2.0 spec Section 11.24.2.7 | |
0cdd49a1 | 542 | * USB 3.1 takes into use the wValue and wLength fields, spec Section 10.16.2.6 |
1da177e4 LT |
543 | */ |
544 | static int get_port_status(struct usb_device *hdev, int port1, | |
0cdd49a1 | 545 | void *data, u16 value, u16 length) |
1da177e4 LT |
546 | { |
547 | int i, status = -ETIMEDOUT; | |
548 | ||
3824c1dd LP |
549 | for (i = 0; i < USB_STS_RETRIES && |
550 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 | 551 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
0cdd49a1 MN |
552 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, value, |
553 | port1, data, length, USB_STS_TIMEOUT); | |
1da177e4 LT |
554 | } |
555 | return status; | |
556 | } | |
557 | ||
0cdd49a1 MN |
558 | static int hub_ext_port_status(struct usb_hub *hub, int port1, int type, |
559 | u16 *status, u16 *change, u32 *ext_status) | |
3eb14915 AS |
560 | { |
561 | int ret; | |
0cdd49a1 MN |
562 | int len = 4; |
563 | ||
564 | if (type != HUB_PORT_STATUS) | |
565 | len = 8; | |
3eb14915 AS |
566 | |
567 | mutex_lock(&hub->status_mutex); | |
0cdd49a1 MN |
568 | ret = get_port_status(hub->hdev, port1, &hub->status->port, type, len); |
569 | if (ret < len) { | |
e9e88fb7 AS |
570 | if (ret != -ENODEV) |
571 | dev_err(hub->intfdev, | |
572 | "%s failed (err = %d)\n", __func__, ret); | |
3eb14915 AS |
573 | if (ret >= 0) |
574 | ret = -EIO; | |
575 | } else { | |
576 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
577 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
0cdd49a1 MN |
578 | if (type != HUB_PORT_STATUS && ext_status) |
579 | *ext_status = le32_to_cpu( | |
580 | hub->status->port.dwExtPortStatus); | |
3eb14915 AS |
581 | ret = 0; |
582 | } | |
583 | mutex_unlock(&hub->status_mutex); | |
584 | return ret; | |
585 | } | |
586 | ||
0cdd49a1 MN |
587 | static int hub_port_status(struct usb_hub *hub, int port1, |
588 | u16 *status, u16 *change) | |
589 | { | |
590 | return hub_ext_port_status(hub, port1, HUB_PORT_STATUS, | |
591 | status, change, NULL); | |
592 | } | |
593 | ||
32a69589 | 594 | static void kick_hub_wq(struct usb_hub *hub) |
1da177e4 | 595 | { |
32a69589 | 596 | struct usb_interface *intf; |
1da177e4 | 597 | |
32a69589 PM |
598 | if (hub->disconnected || work_pending(&hub->events)) |
599 | return; | |
8e4ceb38 | 600 | |
32a69589 PM |
601 | /* |
602 | * Suppress autosuspend until the event is proceed. | |
603 | * | |
604 | * Be careful and make sure that the symmetric operation is | |
605 | * always called. We are here only when there is no pending | |
606 | * work for this hub. Therefore put the interface either when | |
607 | * the new work is called or when it is canceled. | |
608 | */ | |
609 | intf = to_usb_interface(hub->intfdev); | |
610 | usb_autopm_get_interface_no_resume(intf); | |
611 | kref_get(&hub->kref); | |
612 | ||
613 | if (queue_work(hub_wq, &hub->events)) | |
614 | return; | |
615 | ||
616 | /* the work has already been scheduled */ | |
617 | usb_autopm_put_interface_async(intf); | |
618 | kref_put(&hub->kref, hub_release); | |
1da177e4 LT |
619 | } |
620 | ||
59d48b3f | 621 | void usb_kick_hub_wq(struct usb_device *hdev) |
1da177e4 | 622 | { |
ad493e5e | 623 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
25118084 AS |
624 | |
625 | if (hub) | |
32a69589 | 626 | kick_hub_wq(hub); |
1da177e4 LT |
627 | } |
628 | ||
4ee823b8 SS |
629 | /* |
630 | * Let the USB core know that a USB 3.0 device has sent a Function Wake Device | |
631 | * Notification, which indicates it had initiated remote wakeup. | |
632 | * | |
633 | * USB 3.0 hubs do not report the port link state change from U3 to U0 when the | |
634 | * device initiates resume, so the USB core will not receive notice of the | |
635 | * resume through the normal hub interrupt URB. | |
636 | */ | |
637 | void usb_wakeup_notification(struct usb_device *hdev, | |
638 | unsigned int portnum) | |
639 | { | |
640 | struct usb_hub *hub; | |
641 | ||
642 | if (!hdev) | |
643 | return; | |
644 | ||
ad493e5e | 645 | hub = usb_hub_to_struct_hub(hdev); |
4ee823b8 SS |
646 | if (hub) { |
647 | set_bit(portnum, hub->wakeup_bits); | |
32a69589 | 648 | kick_hub_wq(hub); |
4ee823b8 SS |
649 | } |
650 | } | |
651 | EXPORT_SYMBOL_GPL(usb_wakeup_notification); | |
1da177e4 LT |
652 | |
653 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 654 | static void hub_irq(struct urb *urb) |
1da177e4 | 655 | { |
ec17cf1c | 656 | struct usb_hub *hub = urb->context; |
e015268d | 657 | int status = urb->status; |
71d2718f | 658 | unsigned i; |
1da177e4 LT |
659 | unsigned long bits; |
660 | ||
e015268d | 661 | switch (status) { |
1da177e4 LT |
662 | case -ENOENT: /* synchronous unlink */ |
663 | case -ECONNRESET: /* async unlink */ | |
664 | case -ESHUTDOWN: /* hardware going away */ | |
665 | return; | |
666 | ||
667 | default: /* presumably an error */ | |
668 | /* Cause a hub reset after 10 consecutive errors */ | |
166b8639 | 669 | dev_dbg(hub->intfdev, "transfer --> %d\n", status); |
1da177e4 LT |
670 | if ((++hub->nerrors < 10) || hub->error) |
671 | goto resubmit; | |
e015268d | 672 | hub->error = status; |
1da177e4 | 673 | /* FALL THROUGH */ |
ec17cf1c | 674 | |
37ebb549 | 675 | /* let hub_wq handle things */ |
1da177e4 LT |
676 | case 0: /* we got data: port status changed */ |
677 | bits = 0; | |
678 | for (i = 0; i < urb->actual_length; ++i) | |
679 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
680 | << (i*8); | |
681 | hub->event_bits[0] = bits; | |
682 | break; | |
683 | } | |
684 | ||
685 | hub->nerrors = 0; | |
686 | ||
37ebb549 | 687 | /* Something happened, let hub_wq figure it out */ |
32a69589 | 688 | kick_hub_wq(hub); |
1da177e4 LT |
689 | |
690 | resubmit: | |
691 | if (hub->quiescing) | |
692 | return; | |
693 | ||
088a3dae KB |
694 | status = usb_submit_urb(hub->urb, GFP_ATOMIC); |
695 | if (status != 0 && status != -ENODEV && status != -EPERM) | |
166b8639 | 696 | dev_err(hub->intfdev, "resubmit --> %d\n", status); |
1da177e4 LT |
697 | } |
698 | ||
699 | /* USB 2.0 spec Section 11.24.2.3 */ | |
700 | static inline int | |
166b8639 | 701 | hub_clear_tt_buffer(struct usb_device *hdev, u16 devinfo, u16 tt) |
1da177e4 | 702 | { |
2c7b871b WG |
703 | /* Need to clear both directions for control ep */ |
704 | if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == | |
705 | USB_ENDPOINT_XFER_CONTROL) { | |
706 | int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
707 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, | |
708 | devinfo ^ 0x8000, tt, NULL, 0, 1000); | |
709 | if (status) | |
710 | return status; | |
711 | } | |
c2f6595f | 712 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
1da177e4 LT |
713 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
714 | tt, NULL, 0, 1000); | |
715 | } | |
716 | ||
717 | /* | |
37ebb549 | 718 | * enumeration blocks hub_wq for a long time. we use keventd instead, since |
1da177e4 LT |
719 | * long blocking there is the exception, not the rule. accordingly, HCDs |
720 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
721 | * both can talk to the same hub concurrently. | |
722 | */ | |
cb88a1b8 | 723 | static void hub_tt_work(struct work_struct *work) |
1da177e4 | 724 | { |
c4028958 | 725 | struct usb_hub *hub = |
cb88a1b8 | 726 | container_of(work, struct usb_hub, tt.clear_work); |
1da177e4 LT |
727 | unsigned long flags; |
728 | ||
166b8639 | 729 | spin_lock_irqsave(&hub->tt.lock, flags); |
3b6054da | 730 | while (!list_empty(&hub->tt.clear_list)) { |
d0f830d3 | 731 | struct list_head *next; |
1da177e4 LT |
732 | struct usb_tt_clear *clear; |
733 | struct usb_device *hdev = hub->hdev; | |
cb88a1b8 | 734 | const struct hc_driver *drv; |
1da177e4 LT |
735 | int status; |
736 | ||
d0f830d3 | 737 | next = hub->tt.clear_list.next; |
166b8639 CM |
738 | clear = list_entry(next, struct usb_tt_clear, clear_list); |
739 | list_del(&clear->clear_list); | |
1da177e4 LT |
740 | |
741 | /* drop lock so HCD can concurrently report other TT errors */ | |
166b8639 CM |
742 | spin_unlock_irqrestore(&hub->tt.lock, flags); |
743 | status = hub_clear_tt_buffer(hdev, clear->devinfo, clear->tt); | |
e9e88fb7 | 744 | if (status && status != -ENODEV) |
166b8639 | 745 | dev_err(&hdev->dev, |
1da177e4 LT |
746 | "clear tt %d (%04x) error %d\n", |
747 | clear->tt, clear->devinfo, status); | |
cb88a1b8 AS |
748 | |
749 | /* Tell the HCD, even if the operation failed */ | |
750 | drv = clear->hcd->driver; | |
751 | if (drv->clear_tt_buffer_complete) | |
752 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); | |
753 | ||
1bc3c9e1 | 754 | kfree(clear); |
cb88a1b8 | 755 | spin_lock_irqsave(&hub->tt.lock, flags); |
1da177e4 | 756 | } |
166b8639 | 757 | spin_unlock_irqrestore(&hub->tt.lock, flags); |
1da177e4 LT |
758 | } |
759 | ||
971fcd49 LT |
760 | /** |
761 | * usb_hub_set_port_power - control hub port's power state | |
41341261 MN |
762 | * @hdev: USB device belonging to the usb hub |
763 | * @hub: target hub | |
971fcd49 LT |
764 | * @port1: port index |
765 | * @set: expected status | |
766 | * | |
767 | * call this function to control port's power via setting or | |
768 | * clearing the port's PORT_POWER feature. | |
626f090c YB |
769 | * |
770 | * Return: 0 if successful. A negative error code otherwise. | |
971fcd49 | 771 | */ |
41341261 MN |
772 | int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, |
773 | int port1, bool set) | |
971fcd49 LT |
774 | { |
775 | int ret; | |
776 | ||
777 | if (set) | |
778 | ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); | |
779 | else | |
ad493e5e LT |
780 | ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
781 | ||
d5c3834e DW |
782 | if (ret) |
783 | return ret; | |
784 | ||
785 | if (set) | |
786 | set_bit(port1, hub->power_bits); | |
787 | else | |
788 | clear_bit(port1, hub->power_bits); | |
789 | return 0; | |
971fcd49 LT |
790 | } |
791 | ||
1da177e4 | 792 | /** |
cb88a1b8 AS |
793 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
794 | * @urb: an URB associated with the failed or incomplete split transaction | |
1da177e4 LT |
795 | * |
796 | * High speed HCDs use this to tell the hub driver that some split control or | |
797 | * bulk transaction failed in a way that requires clearing internal state of | |
798 | * a transaction translator. This is normally detected (and reported) from | |
799 | * interrupt context. | |
800 | * | |
801 | * It may not be possible for that hub to handle additional full (or low) | |
802 | * speed transactions until that state is fully cleared out. | |
626f090c YB |
803 | * |
804 | * Return: 0 if successful. A negative error code otherwise. | |
1da177e4 | 805 | */ |
cb88a1b8 | 806 | int usb_hub_clear_tt_buffer(struct urb *urb) |
1da177e4 | 807 | { |
cb88a1b8 AS |
808 | struct usb_device *udev = urb->dev; |
809 | int pipe = urb->pipe; | |
1da177e4 LT |
810 | struct usb_tt *tt = udev->tt; |
811 | unsigned long flags; | |
812 | struct usb_tt_clear *clear; | |
813 | ||
814 | /* we've got to cope with an arbitrary number of pending TT clears, | |
815 | * since each TT has "at least two" buffers that can need it (and | |
816 | * there can be many TTs per hub). even if they're uncommon. | |
817 | */ | |
d544d273 GKH |
818 | clear = kmalloc(sizeof *clear, GFP_ATOMIC); |
819 | if (clear == NULL) { | |
166b8639 | 820 | dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
1da177e4 | 821 | /* FIXME recover somehow ... RESET_TT? */ |
cb88a1b8 | 822 | return -ENOMEM; |
1da177e4 LT |
823 | } |
824 | ||
825 | /* info that CLEAR_TT_BUFFER needs */ | |
826 | clear->tt = tt->multi ? udev->ttport : 1; | |
827 | clear->devinfo = usb_pipeendpoint (pipe); | |
828 | clear->devinfo |= udev->devnum << 4; | |
166b8639 | 829 | clear->devinfo |= usb_pipecontrol(pipe) |
1da177e4 LT |
830 | ? (USB_ENDPOINT_XFER_CONTROL << 11) |
831 | : (USB_ENDPOINT_XFER_BULK << 11); | |
166b8639 | 832 | if (usb_pipein(pipe)) |
1da177e4 | 833 | clear->devinfo |= 1 << 15; |
cb88a1b8 AS |
834 | |
835 | /* info for completion callback */ | |
836 | clear->hcd = bus_to_hcd(udev->bus); | |
837 | clear->ep = urb->ep; | |
838 | ||
1da177e4 | 839 | /* tell keventd to clear state for this TT */ |
166b8639 CM |
840 | spin_lock_irqsave(&tt->lock, flags); |
841 | list_add_tail(&clear->clear_list, &tt->clear_list); | |
cb88a1b8 | 842 | schedule_work(&tt->clear_work); |
166b8639 | 843 | spin_unlock_irqrestore(&tt->lock, flags); |
cb88a1b8 | 844 | return 0; |
1da177e4 | 845 | } |
cb88a1b8 | 846 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
1da177e4 | 847 | |
7ad3c470 | 848 | static void hub_power_on(struct usb_hub *hub, bool do_delay) |
1da177e4 LT |
849 | { |
850 | int port1; | |
4489a571 AS |
851 | |
852 | /* Enable power on each port. Some hubs have reserved values | |
853 | * of LPSM (> 2) in their descriptors, even though they are | |
854 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
855 | * but only emulate it. In all cases, the ports won't work | |
856 | * unless we send these messages to the hub. | |
857 | */ | |
9262c19d | 858 | if (hub_is_port_power_switchable(hub)) |
1da177e4 | 859 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
860 | else |
861 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
862 | "non-switchable hub\n"); | |
3bbc47d8 | 863 | for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) |
d5c3834e | 864 | if (test_bit(port1, hub->power_bits)) |
ad493e5e LT |
865 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); |
866 | else | |
867 | usb_clear_port_feature(hub->hdev, port1, | |
868 | USB_PORT_FEAT_POWER); | |
8520f380 | 869 | if (do_delay) |
7ad3c470 | 870 | msleep(hub_power_on_good_delay(hub)); |
1da177e4 LT |
871 | } |
872 | ||
1da177e4 LT |
873 | static int hub_hub_status(struct usb_hub *hub, |
874 | u16 *status, u16 *change) | |
875 | { | |
876 | int ret; | |
877 | ||
db90e7a1 | 878 | mutex_lock(&hub->status_mutex); |
1da177e4 | 879 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
e9e88fb7 AS |
880 | if (ret < 0) { |
881 | if (ret != -ENODEV) | |
882 | dev_err(hub->intfdev, | |
883 | "%s failed (err = %d)\n", __func__, ret); | |
884 | } else { | |
1da177e4 | 885 | *status = le16_to_cpu(hub->status->hub.wHubStatus); |
469271f8 | 886 | *change = le16_to_cpu(hub->status->hub.wHubChange); |
1da177e4 LT |
887 | ret = 0; |
888 | } | |
db90e7a1 | 889 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
890 | return ret; |
891 | } | |
892 | ||
41e7e056 SS |
893 | static int hub_set_port_link_state(struct usb_hub *hub, int port1, |
894 | unsigned int link_status) | |
895 | { | |
896 | return set_port_feature(hub->hdev, | |
897 | port1 | (link_status << 3), | |
898 | USB_PORT_FEAT_LINK_STATE); | |
899 | } | |
900 | ||
901 | /* | |
902 | * If USB 3.0 ports are placed into the Disabled state, they will no longer | |
903 | * detect any device connects or disconnects. This is generally not what the | |
904 | * USB core wants, since it expects a disabled port to produce a port status | |
905 | * change event when a new device connects. | |
906 | * | |
907 | * Instead, set the link state to Disabled, wait for the link to settle into | |
908 | * that state, clear any change bits, and then put the port into the RxDetect | |
909 | * state. | |
910 | */ | |
911 | static int hub_usb3_port_disable(struct usb_hub *hub, int port1) | |
912 | { | |
913 | int ret; | |
914 | int total_time; | |
915 | u16 portchange, portstatus; | |
916 | ||
917 | if (!hub_is_superspeed(hub->hdev)) | |
918 | return -EINVAL; | |
919 | ||
bb86cf56 GG |
920 | ret = hub_port_status(hub, port1, &portstatus, &portchange); |
921 | if (ret < 0) | |
922 | return ret; | |
923 | ||
924 | /* | |
925 | * USB controller Advanced Micro Devices, Inc. [AMD] FCH USB XHCI | |
926 | * Controller [1022:7814] will have spurious result making the following | |
927 | * usb 3.0 device hotplugging route to the 2.0 root hub and recognized | |
928 | * as high-speed device if we set the usb 3.0 port link state to | |
929 | * Disabled. Since it's already in USB_SS_PORT_LS_RX_DETECT state, we | |
930 | * check the state here to avoid the bug. | |
931 | */ | |
932 | if ((portstatus & USB_PORT_STAT_LINK_STATE) == | |
933 | USB_SS_PORT_LS_RX_DETECT) { | |
934 | dev_dbg(&hub->ports[port1 - 1]->dev, | |
935 | "Not disabling port; link state is RxDetect\n"); | |
936 | return ret; | |
937 | } | |
938 | ||
41e7e056 | 939 | ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); |
e9e88fb7 | 940 | if (ret) |
41e7e056 | 941 | return ret; |
41e7e056 SS |
942 | |
943 | /* Wait for the link to enter the disabled state. */ | |
944 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
945 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
946 | if (ret < 0) | |
947 | return ret; | |
948 | ||
949 | if ((portstatus & USB_PORT_STAT_LINK_STATE) == | |
950 | USB_SS_PORT_LS_SS_DISABLED) | |
951 | break; | |
952 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
953 | break; | |
954 | msleep(HUB_DEBOUNCE_STEP); | |
955 | } | |
956 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
d99f6b41 DW |
957 | dev_warn(&hub->ports[port1 - 1]->dev, |
958 | "Could not disable after %d ms\n", total_time); | |
41e7e056 SS |
959 | |
960 | return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); | |
961 | } | |
962 | ||
8b28c752 AS |
963 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
964 | { | |
d99f6b41 | 965 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
8b28c752 | 966 | struct usb_device *hdev = hub->hdev; |
0458d5b4 | 967 | int ret = 0; |
8b28c752 | 968 | |
d99f6b41 DW |
969 | if (port_dev->child && set_state) |
970 | usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED); | |
41e7e056 SS |
971 | if (!hub->error) { |
972 | if (hub_is_superspeed(hub->hdev)) | |
973 | ret = hub_usb3_port_disable(hub, port1); | |
974 | else | |
ad493e5e | 975 | ret = usb_clear_port_feature(hdev, port1, |
41e7e056 SS |
976 | USB_PORT_FEAT_ENABLE); |
977 | } | |
e9e88fb7 | 978 | if (ret && ret != -ENODEV) |
d99f6b41 | 979 | dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret); |
8b28c752 AS |
980 | return ret; |
981 | } | |
982 | ||
0458d5b4 | 983 | /* |
6d42fcdb | 984 | * Disable a port and mark a logical connect-change event, so that some |
37ebb549 | 985 | * time later hub_wq will disconnect() any existing usb_device on the port |
0458d5b4 AS |
986 | * and will re-enumerate if there actually is a device attached. |
987 | */ | |
988 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
989 | { | |
d99f6b41 | 990 | dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n"); |
0458d5b4 | 991 | hub_port_disable(hub, port1, 1); |
7d069b7d | 992 | |
0458d5b4 AS |
993 | /* FIXME let caller ask to power down the port: |
994 | * - some devices won't enumerate without a VBUS power cycle | |
995 | * - SRP saves power that way | |
996 | * - ... new call, TBD ... | |
997 | * That's easy if this hub can switch power per-port, and | |
37ebb549 | 998 | * hub_wq reactivates the port later (timer, SRP, etc). |
0458d5b4 AS |
999 | * Powerdown must be optional, because of reset/DFU. |
1000 | */ | |
1001 | ||
1002 | set_bit(port1, hub->change_bits); | |
32a69589 | 1003 | kick_hub_wq(hub); |
0458d5b4 AS |
1004 | } |
1005 | ||
253e0572 AS |
1006 | /** |
1007 | * usb_remove_device - disable a device's port on its parent hub | |
1008 | * @udev: device to be disabled and removed | |
1009 | * Context: @udev locked, must be able to sleep. | |
1010 | * | |
37ebb549 | 1011 | * After @udev's port has been disabled, hub_wq is notified and it will |
253e0572 AS |
1012 | * see that the device has been disconnected. When the device is |
1013 | * physically unplugged and something is plugged in, the events will | |
1014 | * be received and processed normally. | |
626f090c YB |
1015 | * |
1016 | * Return: 0 if successful. A negative error code otherwise. | |
253e0572 AS |
1017 | */ |
1018 | int usb_remove_device(struct usb_device *udev) | |
1019 | { | |
1020 | struct usb_hub *hub; | |
1021 | struct usb_interface *intf; | |
1022 | ||
1023 | if (!udev->parent) /* Can't remove a root hub */ | |
1024 | return -EINVAL; | |
ad493e5e | 1025 | hub = usb_hub_to_struct_hub(udev->parent); |
253e0572 AS |
1026 | intf = to_usb_interface(hub->intfdev); |
1027 | ||
1028 | usb_autopm_get_interface(intf); | |
1029 | set_bit(udev->portnum, hub->removed_bits); | |
1030 | hub_port_logical_disconnect(hub, udev->portnum); | |
1031 | usb_autopm_put_interface(intf); | |
1032 | return 0; | |
1033 | } | |
1034 | ||
6ee0b270 | 1035 | enum hub_activation_type { |
8e4ceb38 | 1036 | HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
8520f380 | 1037 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
6ee0b270 | 1038 | }; |
5e6effae | 1039 | |
8520f380 AS |
1040 | static void hub_init_func2(struct work_struct *ws); |
1041 | static void hub_init_func3(struct work_struct *ws); | |
1042 | ||
f2835219 | 1043 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
5e6effae AS |
1044 | { |
1045 | struct usb_device *hdev = hub->hdev; | |
653a39d1 SS |
1046 | struct usb_hcd *hcd; |
1047 | int ret; | |
5e6effae | 1048 | int port1; |
f2835219 | 1049 | int status; |
948fea37 | 1050 | bool need_debounce_delay = false; |
8520f380 AS |
1051 | unsigned delay; |
1052 | ||
1053 | /* Continue a partial initialization */ | |
e50293ef AS |
1054 | if (type == HUB_INIT2 || type == HUB_INIT3) { |
1055 | device_lock(hub->intfdev); | |
1056 | ||
1057 | /* Was the hub disconnected while we were waiting? */ | |
ca5cbc8b AS |
1058 | if (hub->disconnected) |
1059 | goto disconnected; | |
e50293ef AS |
1060 | if (type == HUB_INIT2) |
1061 | goto init2; | |
8520f380 | 1062 | goto init3; |
e50293ef AS |
1063 | } |
1064 | kref_get(&hub->kref); | |
5e6effae | 1065 | |
a45aa3b3 EF |
1066 | /* The superspeed hub except for root hub has to use Hub Depth |
1067 | * value as an offset into the route string to locate the bits | |
1068 | * it uses to determine the downstream port number. So hub driver | |
1069 | * should send a set hub depth request to superspeed hub after | |
1070 | * the superspeed hub is set configuration in initialization or | |
1071 | * reset procedure. | |
1072 | * | |
1073 | * After a resume, port power should still be on. | |
f2835219 AS |
1074 | * For any other type of activation, turn it on. |
1075 | */ | |
8520f380 | 1076 | if (type != HUB_RESUME) { |
a45aa3b3 EF |
1077 | if (hdev->parent && hub_is_superspeed(hdev)) { |
1078 | ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
1079 | HUB_SET_DEPTH, USB_RT_HUB, | |
1080 | hdev->level - 1, 0, NULL, 0, | |
1081 | USB_CTRL_SET_TIMEOUT); | |
1082 | if (ret < 0) | |
1083 | dev_err(hub->intfdev, | |
1084 | "set hub depth failed\n"); | |
1085 | } | |
8520f380 AS |
1086 | |
1087 | /* Speed up system boot by using a delayed_work for the | |
1088 | * hub's initial power-up delays. This is pretty awkward | |
1089 | * and the implementation looks like a home-brewed sort of | |
1090 | * setjmp/longjmp, but it saves at least 100 ms for each | |
1091 | * root hub (assuming usbcore is compiled into the kernel | |
1092 | * rather than as a module). It adds up. | |
1093 | * | |
1094 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME | |
1095 | * because for those activation types the ports have to be | |
1096 | * operational when we return. In theory this could be done | |
1097 | * for HUB_POST_RESET, but it's easier not to. | |
1098 | */ | |
1099 | if (type == HUB_INIT) { | |
17a364e2 | 1100 | delay = hub_power_on_good_delay(hub); |
7ad3c470 DW |
1101 | |
1102 | hub_power_on(hub, false); | |
77fa83cf | 1103 | INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); |
22f6a0f0 SD |
1104 | queue_delayed_work(system_power_efficient_wq, |
1105 | &hub->init_work, | |
8520f380 | 1106 | msecs_to_jiffies(delay)); |
61fbeba1 AS |
1107 | |
1108 | /* Suppress autosuspend until init is done */ | |
8e4ceb38 AS |
1109 | usb_autopm_get_interface_no_resume( |
1110 | to_usb_interface(hub->intfdev)); | |
8520f380 | 1111 | return; /* Continues at init2: below */ |
653a39d1 SS |
1112 | } else if (type == HUB_RESET_RESUME) { |
1113 | /* The internal host controller state for the hub device | |
1114 | * may be gone after a host power loss on system resume. | |
1115 | * Update the device's info so the HW knows it's a hub. | |
1116 | */ | |
1117 | hcd = bus_to_hcd(hdev->bus); | |
1118 | if (hcd->driver->update_hub_device) { | |
1119 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1120 | &hub->tt, GFP_NOIO); | |
1121 | if (ret < 0) { | |
1122 | dev_err(hub->intfdev, "Host not " | |
1123 | "accepting hub info " | |
1124 | "update.\n"); | |
1125 | dev_err(hub->intfdev, "LS/FS devices " | |
1126 | "and hubs may not work " | |
1127 | "under this hub\n."); | |
1128 | } | |
1129 | } | |
1130 | hub_power_on(hub, true); | |
8520f380 AS |
1131 | } else { |
1132 | hub_power_on(hub, true); | |
1133 | } | |
1134 | } | |
1135 | init2: | |
f2835219 | 1136 | |
d99f6b41 | 1137 | /* |
37ebb549 | 1138 | * Check each port and set hub->change_bits to let hub_wq know |
6ee0b270 | 1139 | * which ports need attention. |
5e6effae AS |
1140 | */ |
1141 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
d99f6b41 DW |
1142 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
1143 | struct usb_device *udev = port_dev->child; | |
5e6effae AS |
1144 | u16 portstatus, portchange; |
1145 | ||
6ee0b270 AS |
1146 | portstatus = portchange = 0; |
1147 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
1148 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
d99f6b41 DW |
1149 | dev_dbg(&port_dev->dev, "status %04x change %04x\n", |
1150 | portstatus, portchange); | |
6ee0b270 | 1151 | |
d99f6b41 DW |
1152 | /* |
1153 | * After anything other than HUB_RESUME (i.e., initialization | |
6ee0b270 AS |
1154 | * or any sort of reset), every port should be disabled. |
1155 | * Unconnected ports should likewise be disabled (paranoia), | |
1156 | * and so should ports for which we have no usb_device. | |
1157 | */ | |
1158 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( | |
1159 | type != HUB_RESUME || | |
1160 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
1161 | !udev || | |
1162 | udev->state == USB_STATE_NOTATTACHED)) { | |
9f0a6cd3 AX |
1163 | /* |
1164 | * USB3 protocol ports will automatically transition | |
1165 | * to Enabled state when detect an USB3.0 device attach. | |
fd1ac4cf DW |
1166 | * Do not disable USB3 protocol ports, just pretend |
1167 | * power was lost | |
9f0a6cd3 | 1168 | */ |
fd1ac4cf DW |
1169 | portstatus &= ~USB_PORT_STAT_ENABLE; |
1170 | if (!hub_is_superspeed(hdev)) | |
ad493e5e | 1171 | usb_clear_port_feature(hdev, port1, |
9f0a6cd3 | 1172 | USB_PORT_FEAT_ENABLE); |
5e6effae AS |
1173 | } |
1174 | ||
948fea37 AS |
1175 | /* Clear status-change flags; we'll debounce later */ |
1176 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
1177 | need_debounce_delay = true; | |
ad493e5e | 1178 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1179 | USB_PORT_FEAT_C_CONNECTION); |
1180 | } | |
1181 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
1182 | need_debounce_delay = true; | |
ad493e5e | 1183 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1184 | USB_PORT_FEAT_C_ENABLE); |
1185 | } | |
e92aee33 JW |
1186 | if (portchange & USB_PORT_STAT_C_RESET) { |
1187 | need_debounce_delay = true; | |
1188 | usb_clear_port_feature(hub->hdev, port1, | |
1189 | USB_PORT_FEAT_C_RESET); | |
1190 | } | |
79c3dd81 DZ |
1191 | if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
1192 | hub_is_superspeed(hub->hdev)) { | |
1193 | need_debounce_delay = true; | |
ad493e5e | 1194 | usb_clear_port_feature(hub->hdev, port1, |
79c3dd81 DZ |
1195 | USB_PORT_FEAT_C_BH_PORT_RESET); |
1196 | } | |
253e0572 AS |
1197 | /* We can forget about a "removed" device when there's a |
1198 | * physical disconnect or the connect status changes. | |
1199 | */ | |
1200 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
1201 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
1202 | clear_bit(port1, hub->removed_bits); | |
1203 | ||
6ee0b270 | 1204 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
37ebb549 | 1205 | /* Tell hub_wq to disconnect the device or |
6ee0b270 AS |
1206 | * check for a new connection |
1207 | */ | |
08d1dec6 SG |
1208 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || |
1209 | (portstatus & USB_PORT_STAT_OVERCURRENT)) | |
6ee0b270 AS |
1210 | set_bit(port1, hub->change_bits); |
1211 | ||
1212 | } else if (portstatus & USB_PORT_STAT_ENABLE) { | |
72937e1e SS |
1213 | bool port_resumed = (portstatus & |
1214 | USB_PORT_STAT_LINK_STATE) == | |
1215 | USB_SS_PORT_LS_U0; | |
6ee0b270 AS |
1216 | /* The power session apparently survived the resume. |
1217 | * If there was an overcurrent or suspend change | |
37ebb549 | 1218 | * (i.e., remote wakeup request), have hub_wq |
72937e1e SS |
1219 | * take care of it. Look at the port link state |
1220 | * for USB 3.0 hubs, since they don't have a suspend | |
1221 | * change bit, and they don't set the port link change | |
1222 | * bit on device-initiated resume. | |
6ee0b270 | 1223 | */ |
72937e1e SS |
1224 | if (portchange || (hub_is_superspeed(hub->hdev) && |
1225 | port_resumed)) | |
6ee0b270 | 1226 | set_bit(port1, hub->change_bits); |
5e6effae | 1227 | |
6ee0b270 | 1228 | } else if (udev->persist_enabled) { |
6ee0b270 | 1229 | #ifdef CONFIG_PM |
5e6effae | 1230 | udev->reset_resume = 1; |
6ee0b270 | 1231 | #endif |
ad493e5e LT |
1232 | /* Don't set the change_bits when the device |
1233 | * was powered off. | |
1234 | */ | |
d5c3834e | 1235 | if (test_bit(port1, hub->power_bits)) |
ad493e5e | 1236 | set_bit(port1, hub->change_bits); |
8808f00c | 1237 | |
6ee0b270 | 1238 | } else { |
37ebb549 | 1239 | /* The power session is gone; tell hub_wq */ |
6ee0b270 AS |
1240 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
1241 | set_bit(port1, hub->change_bits); | |
5e6effae | 1242 | } |
5e6effae AS |
1243 | } |
1244 | ||
948fea37 AS |
1245 | /* If no port-status-change flags were set, we don't need any |
1246 | * debouncing. If flags were set we can try to debounce the | |
37ebb549 | 1247 | * ports all at once right now, instead of letting hub_wq do them |
948fea37 AS |
1248 | * one at a time later on. |
1249 | * | |
37ebb549 | 1250 | * If any port-status changes do occur during this delay, hub_wq |
948fea37 AS |
1251 | * will see them later and handle them normally. |
1252 | */ | |
8520f380 AS |
1253 | if (need_debounce_delay) { |
1254 | delay = HUB_DEBOUNCE_STABLE; | |
1255 | ||
1256 | /* Don't do a long sleep inside a workqueue routine */ | |
1257 | if (type == HUB_INIT2) { | |
77fa83cf | 1258 | INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); |
22f6a0f0 SD |
1259 | queue_delayed_work(system_power_efficient_wq, |
1260 | &hub->init_work, | |
8520f380 | 1261 | msecs_to_jiffies(delay)); |
e50293ef | 1262 | device_unlock(hub->intfdev); |
8520f380 AS |
1263 | return; /* Continues at init3: below */ |
1264 | } else { | |
1265 | msleep(delay); | |
1266 | } | |
1267 | } | |
1268 | init3: | |
f2835219 AS |
1269 | hub->quiescing = 0; |
1270 | ||
1271 | status = usb_submit_urb(hub->urb, GFP_NOIO); | |
1272 | if (status < 0) | |
1273 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
1274 | if (hub->has_indicators && blinkenlights) | |
22f6a0f0 SD |
1275 | queue_delayed_work(system_power_efficient_wq, |
1276 | &hub->leds, LED_CYCLE_PERIOD); | |
f2835219 AS |
1277 | |
1278 | /* Scan all ports that need attention */ | |
32a69589 | 1279 | kick_hub_wq(hub); |
8e4ceb38 | 1280 | |
ca5cbc8b AS |
1281 | if (type == HUB_INIT2 || type == HUB_INIT3) { |
1282 | /* Allow autosuspend if it was suppressed */ | |
1283 | disconnected: | |
8e4ceb38 | 1284 | usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); |
e50293ef | 1285 | device_unlock(hub->intfdev); |
ca5cbc8b | 1286 | } |
e50293ef AS |
1287 | |
1288 | kref_put(&hub->kref, hub_release); | |
5e6effae AS |
1289 | } |
1290 | ||
8520f380 AS |
1291 | /* Implement the continuations for the delays above */ |
1292 | static void hub_init_func2(struct work_struct *ws) | |
1293 | { | |
1294 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
1295 | ||
1296 | hub_activate(hub, HUB_INIT2); | |
1297 | } | |
1298 | ||
1299 | static void hub_init_func3(struct work_struct *ws) | |
1300 | { | |
1301 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
1302 | ||
1303 | hub_activate(hub, HUB_INIT3); | |
1304 | } | |
1305 | ||
4330354f AS |
1306 | enum hub_quiescing_type { |
1307 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND | |
1308 | }; | |
1309 | ||
1310 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) | |
1311 | { | |
1312 | struct usb_device *hdev = hub->hdev; | |
1313 | int i; | |
1314 | ||
37ebb549 | 1315 | /* hub_wq and related activity won't re-trigger */ |
4330354f AS |
1316 | hub->quiescing = 1; |
1317 | ||
1318 | if (type != HUB_SUSPEND) { | |
1319 | /* Disconnect all the children */ | |
1320 | for (i = 0; i < hdev->maxchild; ++i) { | |
ff823c79 LT |
1321 | if (hub->ports[i]->child) |
1322 | usb_disconnect(&hub->ports[i]->child); | |
4330354f AS |
1323 | } |
1324 | } | |
1325 | ||
37ebb549 | 1326 | /* Stop hub_wq and related activity */ |
4330354f AS |
1327 | usb_kill_urb(hub->urb); |
1328 | if (hub->has_indicators) | |
1329 | cancel_delayed_work_sync(&hub->leds); | |
1330 | if (hub->tt.hub) | |
036546bf | 1331 | flush_work(&hub->tt.clear_work); |
4330354f AS |
1332 | } |
1333 | ||
600856c2 AS |
1334 | static void hub_pm_barrier_for_all_ports(struct usb_hub *hub) |
1335 | { | |
1336 | int i; | |
1337 | ||
1338 | for (i = 0; i < hub->hdev->maxchild; ++i) | |
1339 | pm_runtime_barrier(&hub->ports[i]->dev); | |
1340 | } | |
1341 | ||
3eb14915 AS |
1342 | /* caller has locked the hub device */ |
1343 | static int hub_pre_reset(struct usb_interface *intf) | |
1344 | { | |
1345 | struct usb_hub *hub = usb_get_intfdata(intf); | |
1346 | ||
4330354f | 1347 | hub_quiesce(hub, HUB_PRE_RESET); |
600856c2 AS |
1348 | hub->in_reset = 1; |
1349 | hub_pm_barrier_for_all_ports(hub); | |
f07600cf | 1350 | return 0; |
7d069b7d AS |
1351 | } |
1352 | ||
1353 | /* caller has locked the hub device */ | |
f07600cf | 1354 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 1355 | { |
7de18d8b AS |
1356 | struct usb_hub *hub = usb_get_intfdata(intf); |
1357 | ||
600856c2 AS |
1358 | hub->in_reset = 0; |
1359 | hub_pm_barrier_for_all_ports(hub); | |
f2835219 | 1360 | hub_activate(hub, HUB_POST_RESET); |
f07600cf | 1361 | return 0; |
7d069b7d AS |
1362 | } |
1363 | ||
1da177e4 LT |
1364 | static int hub_configure(struct usb_hub *hub, |
1365 | struct usb_endpoint_descriptor *endpoint) | |
1366 | { | |
b356b7c7 | 1367 | struct usb_hcd *hcd; |
1da177e4 LT |
1368 | struct usb_device *hdev = hub->hdev; |
1369 | struct device *hub_dev = hub->intfdev; | |
1370 | u16 hubstatus, hubchange; | |
74ad9bd2 | 1371 | u16 wHubCharacteristics; |
1da177e4 | 1372 | unsigned int pipe; |
fa2a9566 | 1373 | int maxp, ret, i; |
7cbe5dca | 1374 | char *message = "out of memory"; |
430ee58e SAS |
1375 | unsigned unit_load; |
1376 | unsigned full_load; | |
d8521afe | 1377 | unsigned maxchild; |
1da177e4 | 1378 | |
d697cdda | 1379 | hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
1da177e4 | 1380 | if (!hub->buffer) { |
1da177e4 LT |
1381 | ret = -ENOMEM; |
1382 | goto fail; | |
1383 | } | |
1384 | ||
1385 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
1386 | if (!hub->status) { | |
1da177e4 LT |
1387 | ret = -ENOMEM; |
1388 | goto fail; | |
1389 | } | |
db90e7a1 | 1390 | mutex_init(&hub->status_mutex); |
1da177e4 LT |
1391 | |
1392 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
1393 | if (!hub->descriptor) { | |
1da177e4 LT |
1394 | ret = -ENOMEM; |
1395 | goto fail; | |
1396 | } | |
1397 | ||
1398 | /* Request the entire hub descriptor. | |
1399 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
1400 | * but the hub can/will return fewer bytes here. | |
1401 | */ | |
dbe79bbe | 1402 | ret = get_hub_descriptor(hdev, hub->descriptor); |
1da177e4 LT |
1403 | if (ret < 0) { |
1404 | message = "can't read hub descriptor"; | |
1405 | goto fail; | |
1406 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
1407 | message = "hub has too many ports!"; | |
1408 | ret = -ENODEV; | |
1409 | goto fail; | |
769d7368 DL |
1410 | } else if (hub->descriptor->bNbrPorts == 0) { |
1411 | message = "hub doesn't have any ports!"; | |
1412 | ret = -ENODEV; | |
1413 | goto fail; | |
1da177e4 LT |
1414 | } |
1415 | ||
d8521afe DW |
1416 | maxchild = hub->descriptor->bNbrPorts; |
1417 | dev_info(hub_dev, "%d port%s detected\n", maxchild, | |
1418 | (maxchild == 1) ? "" : "s"); | |
1da177e4 | 1419 | |
d8521afe | 1420 | hub->ports = kzalloc(maxchild * sizeof(struct usb_port *), GFP_KERNEL); |
ff823c79 | 1421 | if (!hub->ports) { |
7cbe5dca AS |
1422 | ret = -ENOMEM; |
1423 | goto fail; | |
1424 | } | |
1425 | ||
74ad9bd2 | 1426 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
430ee58e SAS |
1427 | if (hub_is_superspeed(hdev)) { |
1428 | unit_load = 150; | |
1429 | full_load = 900; | |
1430 | } else { | |
1431 | unit_load = 100; | |
1432 | full_load = 500; | |
1433 | } | |
1da177e4 | 1434 | |
dbe79bbe JY |
1435 | /* FIXME for USB 3.0, skip for now */ |
1436 | if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && | |
1437 | !(hub_is_superspeed(hdev))) { | |
469271f8 | 1438 | char portstr[USB_MAXCHILDREN + 1]; |
1da177e4 | 1439 | |
d8521afe | 1440 | for (i = 0; i < maxchild; i++) |
dbe79bbe | 1441 | portstr[i] = hub->descriptor->u.hs.DeviceRemovable |
1da177e4 LT |
1442 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
1443 | ? 'F' : 'R'; | |
d8521afe | 1444 | portstr[maxchild] = 0; |
1da177e4 LT |
1445 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); |
1446 | } else | |
1447 | dev_dbg(hub_dev, "standalone hub\n"); | |
1448 | ||
74ad9bd2 | 1449 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
7bf01185 AD |
1450 | case HUB_CHAR_COMMON_LPSM: |
1451 | dev_dbg(hub_dev, "ganged power switching\n"); | |
1452 | break; | |
1453 | case HUB_CHAR_INDV_PORT_LPSM: | |
1454 | dev_dbg(hub_dev, "individual port power switching\n"); | |
1455 | break; | |
1456 | case HUB_CHAR_NO_LPSM: | |
1457 | case HUB_CHAR_LPSM: | |
1458 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
1459 | break; | |
1da177e4 LT |
1460 | } |
1461 | ||
74ad9bd2 | 1462 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
7bf01185 AD |
1463 | case HUB_CHAR_COMMON_OCPM: |
1464 | dev_dbg(hub_dev, "global over-current protection\n"); | |
1465 | break; | |
1466 | case HUB_CHAR_INDV_PORT_OCPM: | |
1467 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
1468 | break; | |
1469 | case HUB_CHAR_NO_OCPM: | |
1470 | case HUB_CHAR_OCPM: | |
1471 | dev_dbg(hub_dev, "no over-current protection\n"); | |
1472 | break; | |
1da177e4 LT |
1473 | } |
1474 | ||
17248569 CM |
1475 | spin_lock_init(&hub->tt.lock); |
1476 | INIT_LIST_HEAD(&hub->tt.clear_list); | |
cb88a1b8 | 1477 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
1da177e4 | 1478 | switch (hdev->descriptor.bDeviceProtocol) { |
7bf01185 AD |
1479 | case USB_HUB_PR_FS: |
1480 | break; | |
1481 | case USB_HUB_PR_HS_SINGLE_TT: | |
1482 | dev_dbg(hub_dev, "Single TT\n"); | |
1483 | hub->tt.hub = hdev; | |
1484 | break; | |
1485 | case USB_HUB_PR_HS_MULTI_TT: | |
1486 | ret = usb_set_interface(hdev, 0, 1); | |
1487 | if (ret == 0) { | |
1488 | dev_dbg(hub_dev, "TT per port\n"); | |
1489 | hub->tt.multi = 1; | |
1490 | } else | |
1491 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
1492 | ret); | |
1493 | hub->tt.hub = hdev; | |
1494 | break; | |
1495 | case USB_HUB_PR_SS: | |
1496 | /* USB 3.0 hubs don't have a TT */ | |
1497 | break; | |
1498 | default: | |
1499 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
1500 | hdev->descriptor.bDeviceProtocol); | |
1501 | break; | |
1da177e4 LT |
1502 | } |
1503 | ||
e09711ae | 1504 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 1505 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
469271f8 MB |
1506 | case HUB_TTTT_8_BITS: |
1507 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
1508 | hub->tt.think_time = 666; | |
e09711ae DB |
1509 | dev_dbg(hub_dev, "TT requires at most %d " |
1510 | "FS bit times (%d ns)\n", | |
469271f8 MB |
1511 | 8, hub->tt.think_time); |
1512 | } | |
1513 | break; | |
1514 | case HUB_TTTT_16_BITS: | |
1515 | hub->tt.think_time = 666 * 2; | |
1516 | dev_dbg(hub_dev, "TT requires at most %d " | |
1517 | "FS bit times (%d ns)\n", | |
1518 | 16, hub->tt.think_time); | |
1519 | break; | |
1520 | case HUB_TTTT_24_BITS: | |
1521 | hub->tt.think_time = 666 * 3; | |
1522 | dev_dbg(hub_dev, "TT requires at most %d " | |
1523 | "FS bit times (%d ns)\n", | |
1524 | 24, hub->tt.think_time); | |
1525 | break; | |
1526 | case HUB_TTTT_32_BITS: | |
1527 | hub->tt.think_time = 666 * 4; | |
1528 | dev_dbg(hub_dev, "TT requires at most %d " | |
1529 | "FS bit times (%d ns)\n", | |
1530 | 32, hub->tt.think_time); | |
1531 | break; | |
1da177e4 LT |
1532 | } |
1533 | ||
1534 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 1535 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
1536 | hub->has_indicators = 1; |
1537 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
1538 | } | |
1539 | ||
1540 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
1541 | hub->descriptor->bPwrOn2PwrGood * 2); | |
1542 | ||
1543 | /* power budgeting mostly matters with bus-powered hubs, | |
1544 | * and battery-powered root hubs (may provide just 8 mA). | |
1545 | */ | |
1546 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
15b7336e | 1547 | if (ret) { |
1da177e4 LT |
1548 | message = "can't get hub status"; |
1549 | goto fail; | |
1550 | } | |
430ee58e | 1551 | hcd = bus_to_hcd(hdev->bus); |
7d35b929 | 1552 | if (hdev == hdev->bus->root_hub) { |
430ee58e SAS |
1553 | if (hcd->power_budget > 0) |
1554 | hdev->bus_mA = hcd->power_budget; | |
1555 | else | |
d8521afe | 1556 | hdev->bus_mA = full_load * maxchild; |
430ee58e SAS |
1557 | if (hdev->bus_mA >= full_load) |
1558 | hub->mA_per_port = full_load; | |
55c52718 AS |
1559 | else { |
1560 | hub->mA_per_port = hdev->bus_mA; | |
1561 | hub->limited_power = 1; | |
1562 | } | |
7d35b929 | 1563 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
430ee58e SAS |
1564 | int remaining = hdev->bus_mA - |
1565 | hub->descriptor->bHubContrCurrent; | |
1566 | ||
1da177e4 LT |
1567 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
1568 | hub->descriptor->bHubContrCurrent); | |
55c52718 | 1569 | hub->limited_power = 1; |
55c52718 | 1570 | |
d8521afe | 1571 | if (remaining < maxchild * unit_load) |
430ee58e | 1572 | dev_warn(hub_dev, |
55c52718 AS |
1573 | "insufficient power available " |
1574 | "to use all downstream ports\n"); | |
430ee58e SAS |
1575 | hub->mA_per_port = unit_load; /* 7.2.1 */ |
1576 | ||
55c52718 AS |
1577 | } else { /* Self-powered external hub */ |
1578 | /* FIXME: What about battery-powered external hubs that | |
1579 | * provide less current per port? */ | |
430ee58e | 1580 | hub->mA_per_port = full_load; |
7d35b929 | 1581 | } |
430ee58e | 1582 | if (hub->mA_per_port < full_load) |
55c52718 AS |
1583 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", |
1584 | hub->mA_per_port); | |
1da177e4 LT |
1585 | |
1586 | ret = hub_hub_status(hub, &hubstatus, &hubchange); | |
1587 | if (ret < 0) { | |
1588 | message = "can't get hub status"; | |
1589 | goto fail; | |
1590 | } | |
1591 | ||
1592 | /* local power status reports aren't always correct */ | |
1593 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
1594 | dev_dbg(hub_dev, "local power source is %s\n", | |
1595 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
1596 | ? "lost (inactive)" : "good"); | |
1597 | ||
74ad9bd2 | 1598 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
1599 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
1600 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
1601 | ||
88fafff9 | 1602 | /* set up the interrupt endpoint |
1603 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
1604 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
1605 | * to send more data (and thus cause overflow). For root hubs, | |
1606 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
1607 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
1608 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
1609 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
1610 | ||
1611 | if (maxp > sizeof(*hub->buffer)) | |
1612 | maxp = sizeof(*hub->buffer); | |
1613 | ||
1614 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
1615 | if (!hub->urb) { | |
1da177e4 LT |
1616 | ret = -ENOMEM; |
1617 | goto fail; | |
1618 | } | |
1619 | ||
1620 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
1621 | hub, endpoint->bInterval); | |
1da177e4 LT |
1622 | |
1623 | /* maybe cycle the hub leds */ | |
1624 | if (hub->has_indicators && blinkenlights) | |
469271f8 | 1625 | hub->indicator[0] = INDICATOR_CYCLE; |
1da177e4 | 1626 | |
d8521afe DW |
1627 | mutex_lock(&usb_port_peer_mutex); |
1628 | for (i = 0; i < maxchild; i++) { | |
e58547eb KM |
1629 | ret = usb_hub_create_port_device(hub, i + 1); |
1630 | if (ret < 0) { | |
fa2a9566 LT |
1631 | dev_err(hub->intfdev, |
1632 | "couldn't create port%d device.\n", i + 1); | |
d8521afe | 1633 | break; |
e58547eb KM |
1634 | } |
1635 | } | |
d8521afe | 1636 | hdev->maxchild = i; |
e3d10505 DW |
1637 | for (i = 0; i < hdev->maxchild; i++) { |
1638 | struct usb_port *port_dev = hub->ports[i]; | |
1639 | ||
1640 | pm_runtime_put(&port_dev->dev); | |
1641 | } | |
1642 | ||
d8521afe DW |
1643 | mutex_unlock(&usb_port_peer_mutex); |
1644 | if (ret < 0) | |
1645 | goto fail; | |
fa2a9566 | 1646 | |
37ebb549 | 1647 | /* Update the HCD's internal representation of this hub before hub_wq |
e3d95580 DW |
1648 | * starts getting port status changes for devices under the hub. |
1649 | */ | |
1650 | if (hcd->driver->update_hub_device) { | |
1651 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1652 | &hub->tt, GFP_KERNEL); | |
1653 | if (ret < 0) { | |
1654 | message = "can't update HCD hub info"; | |
1655 | goto fail; | |
1656 | } | |
1657 | } | |
1658 | ||
d2123fd9 LT |
1659 | usb_hub_adjust_deviceremovable(hdev, hub->descriptor); |
1660 | ||
f2835219 | 1661 | hub_activate(hub, HUB_INIT); |
1da177e4 LT |
1662 | return 0; |
1663 | ||
1664 | fail: | |
17248569 | 1665 | dev_err(hub_dev, "config failed, %s (err %d)\n", |
1da177e4 LT |
1666 | message, ret); |
1667 | /* hub_disconnect() frees urb and descriptor */ | |
1668 | return ret; | |
1669 | } | |
1670 | ||
e8054854 AS |
1671 | static void hub_release(struct kref *kref) |
1672 | { | |
1673 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
1674 | ||
5d14f323 | 1675 | usb_put_dev(hub->hdev); |
e8054854 AS |
1676 | usb_put_intf(to_usb_interface(hub->intfdev)); |
1677 | kfree(hub); | |
1678 | } | |
1679 | ||
1da177e4 LT |
1680 | static unsigned highspeed_hubs; |
1681 | ||
1682 | static void hub_disconnect(struct usb_interface *intf) | |
1683 | { | |
8816230e | 1684 | struct usb_hub *hub = usb_get_intfdata(intf); |
fa286188 | 1685 | struct usb_device *hdev = interface_to_usbdev(intf); |
543d7784 | 1686 | int port1; |
fa2a9566 | 1687 | |
32a69589 PM |
1688 | /* |
1689 | * Stop adding new hub events. We do not want to block here and thus | |
1690 | * will not try to remove any pending work item. | |
1691 | */ | |
e8054854 | 1692 | hub->disconnected = 1; |
1da177e4 | 1693 | |
7de18d8b AS |
1694 | /* Disconnect all children and quiesce the hub */ |
1695 | hub->error = 0; | |
4330354f | 1696 | hub_quiesce(hub, HUB_DISCONNECT); |
7de18d8b | 1697 | |
d8521afe DW |
1698 | mutex_lock(&usb_port_peer_mutex); |
1699 | ||
543d7784 AS |
1700 | /* Avoid races with recursively_mark_NOTATTACHED() */ |
1701 | spin_lock_irq(&device_state_lock); | |
1702 | port1 = hdev->maxchild; | |
1703 | hdev->maxchild = 0; | |
1704 | usb_set_intfdata(intf, NULL); | |
1705 | spin_unlock_irq(&device_state_lock); | |
1f2235b8 | 1706 | |
543d7784 AS |
1707 | for (; port1 > 0; --port1) |
1708 | usb_hub_remove_port_device(hub, port1); | |
1da177e4 | 1709 | |
d8521afe DW |
1710 | mutex_unlock(&usb_port_peer_mutex); |
1711 | ||
e8054854 | 1712 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
1713 | highspeed_hubs--; |
1714 | ||
1da177e4 | 1715 | usb_free_urb(hub->urb); |
fa2a9566 | 1716 | kfree(hub->ports); |
1bc3c9e1 | 1717 | kfree(hub->descriptor); |
1bc3c9e1 | 1718 | kfree(hub->status); |
d697cdda | 1719 | kfree(hub->buffer); |
1da177e4 | 1720 | |
971fcd49 | 1721 | pm_suspend_ignore_children(&intf->dev, false); |
e8054854 | 1722 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
1723 | } |
1724 | ||
1725 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
1726 | { | |
1727 | struct usb_host_interface *desc; | |
1728 | struct usb_endpoint_descriptor *endpoint; | |
1729 | struct usb_device *hdev; | |
1730 | struct usb_hub *hub; | |
1731 | ||
1732 | desc = intf->cur_altsetting; | |
1733 | hdev = interface_to_usbdev(intf); | |
1734 | ||
596d789a ML |
1735 | /* |
1736 | * Set default autosuspend delay as 0 to speedup bus suspend, | |
1737 | * based on the below considerations: | |
1738 | * | |
1739 | * - Unlike other drivers, the hub driver does not rely on the | |
1740 | * autosuspend delay to provide enough time to handle a wakeup | |
1741 | * event, and the submitted status URB is just to check future | |
1742 | * change on hub downstream ports, so it is safe to do it. | |
1743 | * | |
1744 | * - The patch might cause one or more auto supend/resume for | |
1745 | * below very rare devices when they are plugged into hub | |
1746 | * first time: | |
1747 | * | |
1748 | * devices having trouble initializing, and disconnect | |
1749 | * themselves from the bus and then reconnect a second | |
1750 | * or so later | |
1751 | * | |
1752 | * devices just for downloading firmware, and disconnects | |
1753 | * themselves after completing it | |
1754 | * | |
1755 | * For these quite rare devices, their drivers may change the | |
1756 | * autosuspend delay of their parent hub in the probe() to one | |
1757 | * appropriate value to avoid the subtle problem if someone | |
1758 | * does care it. | |
1759 | * | |
1760 | * - The patch may cause one or more auto suspend/resume on | |
1761 | * hub during running 'lsusb', but it is probably too | |
1762 | * infrequent to worry about. | |
1763 | * | |
1764 | * - Change autosuspend delay of hub can avoid unnecessary auto | |
1765 | * suspend timer for hub, also may decrease power consumption | |
1766 | * of USB bus. | |
bdd405d2 RQ |
1767 | * |
1768 | * - If user has indicated to prevent autosuspend by passing | |
1769 | * usbcore.autosuspend = -1 then keep autosuspend disabled. | |
596d789a | 1770 | */ |
ceb6c9c8 | 1771 | #ifdef CONFIG_PM |
bdd405d2 RQ |
1772 | if (hdev->dev.power.autosuspend_delay >= 0) |
1773 | pm_runtime_set_autosuspend_delay(&hdev->dev, 0); | |
a9ef803d | 1774 | #endif |
596d789a | 1775 | |
8ef42ddd AS |
1776 | /* |
1777 | * Hubs have proper suspend/resume support, except for root hubs | |
1778 | * where the controller driver doesn't have bus_suspend and | |
1779 | * bus_resume methods. | |
1780 | */ | |
1781 | if (hdev->parent) { /* normal device */ | |
1782 | usb_enable_autosuspend(hdev); | |
1783 | } else { /* root hub */ | |
1784 | const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; | |
1785 | ||
1786 | if (drv->bus_suspend && drv->bus_resume) | |
1787 | usb_enable_autosuspend(hdev); | |
1788 | } | |
088f7fec | 1789 | |
38f3ad5e | 1790 | if (hdev->level == MAX_TOPO_LEVEL) { |
b9cef6c3 WF |
1791 | dev_err(&intf->dev, |
1792 | "Unsupported bus topology: hub nested too deep\n"); | |
38f3ad5e FB |
1793 | return -E2BIG; |
1794 | } | |
1795 | ||
89ccbdc9 DB |
1796 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
1797 | if (hdev->parent) { | |
1798 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
1799 | return -ENODEV; | |
1800 | } | |
1801 | #endif | |
1802 | ||
1da177e4 LT |
1803 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
1804 | /* specs is not defined, but it works */ | |
1805 | if ((desc->desc.bInterfaceSubClass != 0) && | |
1806 | (desc->desc.bInterfaceSubClass != 1)) { | |
1807 | descriptor_error: | |
17248569 | 1808 | dev_err(&intf->dev, "bad descriptor, ignoring hub\n"); |
1da177e4 LT |
1809 | return -EIO; |
1810 | } | |
1811 | ||
1812 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
1813 | if (desc->desc.bNumEndpoints != 1) | |
1814 | goto descriptor_error; | |
1815 | ||
1816 | endpoint = &desc->endpoint[0].desc; | |
1817 | ||
fbf81c29 LFC |
1818 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
1819 | if (!usb_endpoint_is_int_in(endpoint)) | |
1da177e4 LT |
1820 | goto descriptor_error; |
1821 | ||
1822 | /* We found a hub */ | |
17248569 | 1823 | dev_info(&intf->dev, "USB hub found\n"); |
1da177e4 | 1824 | |
0a1ef3b5 | 1825 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 | 1826 | if (!hub) { |
17248569 | 1827 | dev_dbg(&intf->dev, "couldn't kmalloc hub struct\n"); |
1da177e4 LT |
1828 | return -ENOMEM; |
1829 | } | |
1830 | ||
e8054854 | 1831 | kref_init(&hub->kref); |
1da177e4 LT |
1832 | hub->intfdev = &intf->dev; |
1833 | hub->hdev = hdev; | |
c4028958 | 1834 | INIT_DELAYED_WORK(&hub->leds, led_work); |
8520f380 | 1835 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
32a69589 | 1836 | INIT_WORK(&hub->events, hub_event); |
e8054854 | 1837 | usb_get_intf(intf); |
5d14f323 | 1838 | usb_get_dev(hdev); |
1da177e4 | 1839 | |
17248569 | 1840 | usb_set_intfdata(intf, hub); |
40f122f3 | 1841 | intf->needs_remote_wakeup = 1; |
971fcd49 | 1842 | pm_suspend_ignore_children(&intf->dev, true); |
1da177e4 LT |
1843 | |
1844 | if (hdev->speed == USB_SPEED_HIGH) | |
1845 | highspeed_hubs++; | |
1846 | ||
e6f30dea ML |
1847 | if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) |
1848 | hub->quirk_check_port_auto_suspend = 1; | |
1849 | ||
1da177e4 LT |
1850 | if (hub_configure(hub, endpoint) >= 0) |
1851 | return 0; | |
1852 | ||
17248569 | 1853 | hub_disconnect(intf); |
1da177e4 LT |
1854 | return -ENODEV; |
1855 | } | |
1856 | ||
1857 | static int | |
1858 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
1859 | { | |
17248569 | 1860 | struct usb_device *hdev = interface_to_usbdev(intf); |
ad493e5e | 1861 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1da177e4 LT |
1862 | |
1863 | /* assert ifno == 0 (part of hub spec) */ | |
1864 | switch (code) { | |
1865 | case USBDEVFS_HUB_PORTINFO: { | |
1866 | struct usbdevfs_hub_portinfo *info = user_data; | |
1867 | int i; | |
1868 | ||
1869 | spin_lock_irq(&device_state_lock); | |
1870 | if (hdev->devnum <= 0) | |
1871 | info->nports = 0; | |
1872 | else { | |
1873 | info->nports = hdev->maxchild; | |
1874 | for (i = 0; i < info->nports; i++) { | |
ff823c79 | 1875 | if (hub->ports[i]->child == NULL) |
1da177e4 LT |
1876 | info->port[i] = 0; |
1877 | else | |
1878 | info->port[i] = | |
ff823c79 | 1879 | hub->ports[i]->child->devnum; |
1da177e4 LT |
1880 | } |
1881 | } | |
1882 | spin_unlock_irq(&device_state_lock); | |
1883 | ||
1884 | return info->nports + 1; | |
1885 | } | |
1886 | ||
1887 | default: | |
1888 | return -ENOSYS; | |
1889 | } | |
1890 | } | |
1891 | ||
7cbe5dca AS |
1892 | /* |
1893 | * Allow user programs to claim ports on a hub. When a device is attached | |
1894 | * to one of these "claimed" ports, the program will "own" the device. | |
1895 | */ | |
1896 | static int find_port_owner(struct usb_device *hdev, unsigned port1, | |
9b6f0c4b | 1897 | struct usb_dev_state ***ppowner) |
7cbe5dca | 1898 | { |
41341261 MN |
1899 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1900 | ||
7cbe5dca AS |
1901 | if (hdev->state == USB_STATE_NOTATTACHED) |
1902 | return -ENODEV; | |
1903 | if (port1 == 0 || port1 > hdev->maxchild) | |
1904 | return -EINVAL; | |
1905 | ||
41341261 | 1906 | /* Devices not managed by the hub driver |
7cbe5dca AS |
1907 | * will always have maxchild equal to 0. |
1908 | */ | |
41341261 | 1909 | *ppowner = &(hub->ports[port1 - 1]->port_owner); |
7cbe5dca AS |
1910 | return 0; |
1911 | } | |
1912 | ||
1913 | /* In the following three functions, the caller must hold hdev's lock */ | |
336c5c31 | 1914 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, |
9b6f0c4b | 1915 | struct usb_dev_state *owner) |
7cbe5dca AS |
1916 | { |
1917 | int rc; | |
9b6f0c4b | 1918 | struct usb_dev_state **powner; |
7cbe5dca AS |
1919 | |
1920 | rc = find_port_owner(hdev, port1, &powner); | |
1921 | if (rc) | |
1922 | return rc; | |
1923 | if (*powner) | |
1924 | return -EBUSY; | |
1925 | *powner = owner; | |
1926 | return rc; | |
1927 | } | |
6080cd0e | 1928 | EXPORT_SYMBOL_GPL(usb_hub_claim_port); |
7cbe5dca | 1929 | |
336c5c31 | 1930 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, |
9b6f0c4b | 1931 | struct usb_dev_state *owner) |
7cbe5dca AS |
1932 | { |
1933 | int rc; | |
9b6f0c4b | 1934 | struct usb_dev_state **powner; |
7cbe5dca AS |
1935 | |
1936 | rc = find_port_owner(hdev, port1, &powner); | |
1937 | if (rc) | |
1938 | return rc; | |
1939 | if (*powner != owner) | |
1940 | return -ENOENT; | |
1941 | *powner = NULL; | |
1942 | return rc; | |
1943 | } | |
6080cd0e | 1944 | EXPORT_SYMBOL_GPL(usb_hub_release_port); |
7cbe5dca | 1945 | |
9b6f0c4b | 1946 | void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner) |
7cbe5dca | 1947 | { |
ad493e5e | 1948 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
7cbe5dca | 1949 | int n; |
7cbe5dca | 1950 | |
fa2a9566 LT |
1951 | for (n = 0; n < hdev->maxchild; n++) { |
1952 | if (hub->ports[n]->port_owner == owner) | |
1953 | hub->ports[n]->port_owner = NULL; | |
7cbe5dca | 1954 | } |
fa2a9566 | 1955 | |
7cbe5dca AS |
1956 | } |
1957 | ||
1958 | /* The caller must hold udev's lock */ | |
1959 | bool usb_device_is_owned(struct usb_device *udev) | |
1960 | { | |
1961 | struct usb_hub *hub; | |
1962 | ||
1963 | if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) | |
1964 | return false; | |
ad493e5e | 1965 | hub = usb_hub_to_struct_hub(udev->parent); |
fa2a9566 | 1966 | return !!hub->ports[udev->portnum - 1]->port_owner; |
7cbe5dca AS |
1967 | } |
1968 | ||
1da177e4 LT |
1969 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1970 | { | |
ad493e5e | 1971 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
1da177e4 LT |
1972 | int i; |
1973 | ||
1974 | for (i = 0; i < udev->maxchild; ++i) { | |
ff823c79 LT |
1975 | if (hub->ports[i]->child) |
1976 | recursively_mark_NOTATTACHED(hub->ports[i]->child); | |
1da177e4 | 1977 | } |
9bbdf1e0 | 1978 | if (udev->state == USB_STATE_SUSPENDED) |
15123006 | 1979 | udev->active_duration -= jiffies; |
1da177e4 LT |
1980 | udev->state = USB_STATE_NOTATTACHED; |
1981 | } | |
1982 | ||
1983 | /** | |
1984 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1985 | * @udev: pointer to device whose state should be changed | |
1986 | * @new_state: new state value to be stored | |
1987 | * | |
1988 | * udev->state is _not_ fully protected by the device lock. Although | |
1989 | * most transitions are made only while holding the lock, the state can | |
1990 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1991 | * is so that devices can be marked as disconnected as soon as possible, | |
1992 | * without having to wait for any semaphores to be released. As a result, | |
1993 | * all changes to any device's state must be protected by the | |
1994 | * device_state_lock spinlock. | |
1995 | * | |
1996 | * Once a device has been added to the device tree, all changes to its state | |
1997 | * should be made using this routine. The state should _not_ be set directly. | |
1998 | * | |
1999 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
2000 | * Otherwise udev->state is set to new_state, and if new_state is | |
2001 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
2002 | * to USB_STATE_NOTATTACHED. | |
2003 | */ | |
2004 | void usb_set_device_state(struct usb_device *udev, | |
2005 | enum usb_device_state new_state) | |
2006 | { | |
2007 | unsigned long flags; | |
4681b171 | 2008 | int wakeup = -1; |
1da177e4 LT |
2009 | |
2010 | spin_lock_irqsave(&device_state_lock, flags); | |
2011 | if (udev->state == USB_STATE_NOTATTACHED) | |
2012 | ; /* do nothing */ | |
b94dc6b5 | 2013 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
2014 | |
2015 | /* root hub wakeup capabilities are managed out-of-band | |
2016 | * and may involve silicon errata ... ignore them here. | |
2017 | */ | |
2018 | if (udev->parent) { | |
645daaab AS |
2019 | if (udev->state == USB_STATE_SUSPENDED |
2020 | || new_state == USB_STATE_SUSPENDED) | |
2021 | ; /* No change to wakeup settings */ | |
2022 | else if (new_state == USB_STATE_CONFIGURED) | |
ddbe1fca LB |
2023 | wakeup = (udev->quirks & |
2024 | USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 : | |
2025 | udev->actconfig->desc.bmAttributes & | |
2026 | USB_CONFIG_ATT_WAKEUP; | |
645daaab | 2027 | else |
4681b171 | 2028 | wakeup = 0; |
fb669cc0 | 2029 | } |
15123006 SS |
2030 | if (udev->state == USB_STATE_SUSPENDED && |
2031 | new_state != USB_STATE_SUSPENDED) | |
2032 | udev->active_duration -= jiffies; | |
2033 | else if (new_state == USB_STATE_SUSPENDED && | |
2034 | udev->state != USB_STATE_SUSPENDED) | |
2035 | udev->active_duration += jiffies; | |
645daaab | 2036 | udev->state = new_state; |
b94dc6b5 | 2037 | } else |
1da177e4 LT |
2038 | recursively_mark_NOTATTACHED(udev); |
2039 | spin_unlock_irqrestore(&device_state_lock, flags); | |
4681b171 RW |
2040 | if (wakeup >= 0) |
2041 | device_set_wakeup_capable(&udev->dev, wakeup); | |
1da177e4 | 2042 | } |
6da9c990 | 2043 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
1da177e4 | 2044 | |
8af548dc | 2045 | /* |
3b29b68b AS |
2046 | * Choose a device number. |
2047 | * | |
2048 | * Device numbers are used as filenames in usbfs. On USB-1.1 and | |
2049 | * USB-2.0 buses they are also used as device addresses, however on | |
2050 | * USB-3.0 buses the address is assigned by the controller hardware | |
2051 | * and it usually is not the same as the device number. | |
2052 | * | |
8af548dc IPG |
2053 | * WUSB devices are simple: they have no hubs behind, so the mapping |
2054 | * device <-> virtual port number becomes 1:1. Why? to simplify the | |
2055 | * life of the device connection logic in | |
2056 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret | |
2057 | * handshake we need to assign a temporary address in the unauthorized | |
2058 | * space. For simplicity we use the first virtual port number found to | |
2059 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] | |
2060 | * and that becomes it's address [X < 128] or its unauthorized address | |
2061 | * [X | 0x80]. | |
2062 | * | |
2063 | * We add 1 as an offset to the one-based USB-stack port number | |
2064 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr | |
2065 | * 0 is reserved by USB for default address; (b) Linux's USB stack | |
2066 | * uses always #1 for the root hub of the controller. So USB stack's | |
2067 | * port #1, which is wusb virtual-port #0 has address #2. | |
c6515272 SS |
2068 | * |
2069 | * Devices connected under xHCI are not as simple. The host controller | |
2070 | * supports virtualization, so the hardware assigns device addresses and | |
2071 | * the HCD must setup data structures before issuing a set address | |
2072 | * command to the hardware. | |
8af548dc | 2073 | */ |
3b29b68b | 2074 | static void choose_devnum(struct usb_device *udev) |
1da177e4 LT |
2075 | { |
2076 | int devnum; | |
2077 | struct usb_bus *bus = udev->bus; | |
2078 | ||
638139eb | 2079 | /* be safe when more hub events are proceed in parallel */ |
feb26ac3 | 2080 | mutex_lock(&bus->devnum_next_mutex); |
8af548dc IPG |
2081 | if (udev->wusb) { |
2082 | devnum = udev->portnum + 1; | |
2083 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); | |
2084 | } else { | |
2085 | /* Try to allocate the next devnum beginning at | |
2086 | * bus->devnum_next. */ | |
2087 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
2088 | bus->devnum_next); | |
2089 | if (devnum >= 128) | |
2090 | devnum = find_next_zero_bit(bus->devmap.devicemap, | |
2091 | 128, 1); | |
469271f8 | 2092 | bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); |
8af548dc | 2093 | } |
1da177e4 LT |
2094 | if (devnum < 128) { |
2095 | set_bit(devnum, bus->devmap.devicemap); | |
2096 | udev->devnum = devnum; | |
2097 | } | |
feb26ac3 | 2098 | mutex_unlock(&bus->devnum_next_mutex); |
1da177e4 LT |
2099 | } |
2100 | ||
3b29b68b | 2101 | static void release_devnum(struct usb_device *udev) |
1da177e4 LT |
2102 | { |
2103 | if (udev->devnum > 0) { | |
2104 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
2105 | udev->devnum = -1; | |
2106 | } | |
2107 | } | |
2108 | ||
3b29b68b | 2109 | static void update_devnum(struct usb_device *udev, int devnum) |
4953d141 DV |
2110 | { |
2111 | /* The address for a WUSB device is managed by wusbcore. */ | |
2112 | if (!udev->wusb) | |
2113 | udev->devnum = devnum; | |
2114 | } | |
2115 | ||
f7410ced HX |
2116 | static void hub_free_dev(struct usb_device *udev) |
2117 | { | |
2118 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2119 | ||
2120 | /* Root hubs aren't real devices, so don't free HCD resources */ | |
2121 | if (hcd->driver->free_dev && udev->parent) | |
2122 | hcd->driver->free_dev(hcd, udev); | |
2123 | } | |
2124 | ||
7027df36 DW |
2125 | static void hub_disconnect_children(struct usb_device *udev) |
2126 | { | |
2127 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); | |
2128 | int i; | |
2129 | ||
2130 | /* Free up all the children before we remove this device */ | |
2131 | for (i = 0; i < udev->maxchild; i++) { | |
2132 | if (hub->ports[i]->child) | |
2133 | usb_disconnect(&hub->ports[i]->child); | |
2134 | } | |
2135 | } | |
2136 | ||
1da177e4 LT |
2137 | /** |
2138 | * usb_disconnect - disconnect a device (usbcore-internal) | |
2139 | * @pdev: pointer to device being disconnected | |
2140 | * Context: !in_interrupt () | |
2141 | * | |
2142 | * Something got disconnected. Get rid of it and all of its children. | |
2143 | * | |
2144 | * If *pdev is a normal device then the parent hub must already be locked. | |
a4b5d606 | 2145 | * If *pdev is a root hub then the caller must hold the usb_bus_idr_lock, |
db8f2aa3 | 2146 | * which protects the set of root hubs as well as the list of buses. |
1da177e4 LT |
2147 | * |
2148 | * Only hub drivers (including virtual root hub drivers for host | |
2149 | * controllers) should ever call this. | |
2150 | * | |
2151 | * This call is synchronous, and may not be used in an interrupt context. | |
2152 | */ | |
2153 | void usb_disconnect(struct usb_device **pdev) | |
2154 | { | |
7027df36 DW |
2155 | struct usb_port *port_dev = NULL; |
2156 | struct usb_device *udev = *pdev; | |
5b1dc209 PC |
2157 | struct usb_hub *hub = NULL; |
2158 | int port1 = 1; | |
1da177e4 | 2159 | |
1da177e4 LT |
2160 | /* mark the device as inactive, so any further urb submissions for |
2161 | * this device (and any of its children) will fail immediately. | |
25985edc | 2162 | * this quiesces everything except pending urbs. |
1da177e4 LT |
2163 | */ |
2164 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
3b29b68b AS |
2165 | dev_info(&udev->dev, "USB disconnect, device number %d\n", |
2166 | udev->devnum); | |
1da177e4 | 2167 | |
9ad3d6cc AS |
2168 | usb_lock_device(udev); |
2169 | ||
7027df36 | 2170 | hub_disconnect_children(udev); |
1da177e4 LT |
2171 | |
2172 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
2173 | * cleaning up all state associated with the current configuration | |
2174 | * so that the hardware is now fully quiesced. | |
2175 | */ | |
17248569 | 2176 | dev_dbg(&udev->dev, "unregistering device\n"); |
1da177e4 | 2177 | usb_disable_device(udev, 0); |
cde217a5 | 2178 | usb_hcd_synchronize_unlinks(udev); |
1da177e4 | 2179 | |
fde26380 | 2180 | if (udev->parent) { |
7027df36 DW |
2181 | port1 = udev->portnum; |
2182 | hub = usb_hub_to_struct_hub(udev->parent); | |
2183 | port_dev = hub->ports[port1 - 1]; | |
fde26380 LT |
2184 | |
2185 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2186 | sysfs_remove_link(&port_dev->dev.kobj, "device"); | |
971fcd49 | 2187 | |
7027df36 DW |
2188 | /* |
2189 | * As usb_port_runtime_resume() de-references udev, make | |
2190 | * sure no resumes occur during removal | |
2191 | */ | |
2192 | if (!test_and_set_bit(port1, hub->child_usage_bits)) | |
2193 | pm_runtime_get_sync(&port_dev->dev); | |
fde26380 LT |
2194 | } |
2195 | ||
3b23dd6f | 2196 | usb_remove_ep_devs(&udev->ep0); |
782da727 AS |
2197 | usb_unlock_device(udev); |
2198 | ||
2199 | /* Unregister the device. The device driver is responsible | |
3b23dd6f AS |
2200 | * for de-configuring the device and invoking the remove-device |
2201 | * notifier chain (used by usbfs and possibly others). | |
782da727 AS |
2202 | */ |
2203 | device_del(&udev->dev); | |
3099e75a | 2204 | |
782da727 | 2205 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
2206 | * (or root_hub) pointer. |
2207 | */ | |
3b29b68b | 2208 | release_devnum(udev); |
1da177e4 LT |
2209 | |
2210 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
2211 | spin_lock_irq(&device_state_lock); | |
2212 | *pdev = NULL; | |
2213 | spin_unlock_irq(&device_state_lock); | |
2214 | ||
7027df36 DW |
2215 | if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits)) |
2216 | pm_runtime_put(&port_dev->dev); | |
2217 | ||
f7410ced HX |
2218 | hub_free_dev(udev); |
2219 | ||
782da727 | 2220 | put_device(&udev->dev); |
1da177e4 LT |
2221 | } |
2222 | ||
f2a383e4 | 2223 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
1da177e4 LT |
2224 | static void show_string(struct usb_device *udev, char *id, char *string) |
2225 | { | |
2226 | if (!string) | |
2227 | return; | |
f2ec522e | 2228 | dev_info(&udev->dev, "%s: %s\n", id, string); |
1da177e4 LT |
2229 | } |
2230 | ||
f2a383e4 GKH |
2231 | static void announce_device(struct usb_device *udev) |
2232 | { | |
2233 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", | |
2234 | le16_to_cpu(udev->descriptor.idVendor), | |
2235 | le16_to_cpu(udev->descriptor.idProduct)); | |
b9cef6c3 WF |
2236 | dev_info(&udev->dev, |
2237 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", | |
f2a383e4 GKH |
2238 | udev->descriptor.iManufacturer, |
2239 | udev->descriptor.iProduct, | |
2240 | udev->descriptor.iSerialNumber); | |
2241 | show_string(udev, "Product", udev->product); | |
2242 | show_string(udev, "Manufacturer", udev->manufacturer); | |
2243 | show_string(udev, "SerialNumber", udev->serial); | |
2244 | } | |
1da177e4 | 2245 | #else |
f2a383e4 | 2246 | static inline void announce_device(struct usb_device *udev) { } |
1da177e4 LT |
2247 | #endif |
2248 | ||
1da177e4 | 2249 | |
3ede760f | 2250 | /** |
8d8558d1 | 2251 | * usb_enumerate_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
2252 | * @udev: newly addressed device (in ADDRESS state) |
2253 | * | |
8d8558d1 | 2254 | * Finish enumeration for On-The-Go devices |
626f090c YB |
2255 | * |
2256 | * Return: 0 if successful. A negative error code otherwise. | |
3ede760f | 2257 | */ |
8d8558d1 | 2258 | static int usb_enumerate_device_otg(struct usb_device *udev) |
1da177e4 | 2259 | { |
d9d16e8a | 2260 | int err = 0; |
1da177e4 LT |
2261 | |
2262 | #ifdef CONFIG_USB_OTG | |
2263 | /* | |
2264 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
2265 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
2266 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
2267 | */ | |
2268 | if (!udev->bus->is_b_host | |
2269 | && udev->config | |
2270 | && udev->parent == udev->bus->root_hub) { | |
2eb5052e | 2271 | struct usb_otg_descriptor *desc = NULL; |
1da177e4 | 2272 | struct usb_bus *bus = udev->bus; |
7d2d641c | 2273 | unsigned port1 = udev->portnum; |
1da177e4 LT |
2274 | |
2275 | /* descriptor may appear anywhere in config */ | |
7d2d641c LJ |
2276 | err = __usb_get_extra_descriptor(udev->rawdescriptors[0], |
2277 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
2278 | USB_DT_OTG, (void **) &desc); | |
2279 | if (err || !(desc->bmAttributes & USB_OTG_HNP)) | |
2280 | return 0; | |
2281 | ||
2282 | dev_info(&udev->dev, "Dual-Role OTG device on %sHNP port\n", | |
2283 | (port1 == bus->otg_port) ? "" : "non-"); | |
2284 | ||
2285 | /* enable HNP before suspend, it's simpler */ | |
2286 | if (port1 == bus->otg_port) { | |
2287 | bus->b_hnp_enable = 1; | |
2288 | err = usb_control_msg(udev, | |
2289 | usb_sndctrlpipe(udev, 0), | |
2290 | USB_REQ_SET_FEATURE, 0, | |
2291 | USB_DEVICE_B_HNP_ENABLE, | |
2292 | 0, NULL, 0, | |
2293 | USB_CTRL_SET_TIMEOUT); | |
2294 | if (err < 0) { | |
2295 | /* | |
2296 | * OTG MESSAGE: report errors here, | |
2297 | * customize to match your product. | |
2298 | */ | |
2299 | dev_err(&udev->dev, "can't set HNP mode: %d\n", | |
2300 | err); | |
2301 | bus->b_hnp_enable = 0; | |
1da177e4 | 2302 | } |
7d2d641c LJ |
2303 | } else if (desc->bLength == sizeof |
2304 | (struct usb_otg_descriptor)) { | |
2305 | /* Set a_alt_hnp_support for legacy otg device */ | |
2306 | err = usb_control_msg(udev, | |
2307 | usb_sndctrlpipe(udev, 0), | |
2308 | USB_REQ_SET_FEATURE, 0, | |
2309 | USB_DEVICE_A_ALT_HNP_SUPPORT, | |
2310 | 0, NULL, 0, | |
2311 | USB_CTRL_SET_TIMEOUT); | |
2312 | if (err < 0) | |
2313 | dev_err(&udev->dev, | |
2314 | "set a_alt_hnp_support failed: %d\n", | |
2315 | err); | |
1da177e4 LT |
2316 | } |
2317 | } | |
1da177e4 | 2318 | #endif |
d9d16e8a IPG |
2319 | return err; |
2320 | } | |
2321 | ||
2322 | ||
2323 | /** | |
8d8558d1 | 2324 | * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
d9d16e8a IPG |
2325 | * @udev: newly addressed device (in ADDRESS state) |
2326 | * | |
2327 | * This is only called by usb_new_device() and usb_authorize_device() | |
2328 | * and FIXME -- all comments that apply to them apply here wrt to | |
2329 | * environment. | |
2330 | * | |
2331 | * If the device is WUSB and not authorized, we don't attempt to read | |
2332 | * the string descriptors, as they will be errored out by the device | |
2333 | * until it has been authorized. | |
626f090c YB |
2334 | * |
2335 | * Return: 0 if successful. A negative error code otherwise. | |
d9d16e8a | 2336 | */ |
8d8558d1 | 2337 | static int usb_enumerate_device(struct usb_device *udev) |
d9d16e8a IPG |
2338 | { |
2339 | int err; | |
026f3fcb | 2340 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 2341 | |
d9d16e8a IPG |
2342 | if (udev->config == NULL) { |
2343 | err = usb_get_configuration(udev); | |
2344 | if (err < 0) { | |
e9e88fb7 AS |
2345 | if (err != -ENODEV) |
2346 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
2347 | err); | |
80da2e0d | 2348 | return err; |
d9d16e8a IPG |
2349 | } |
2350 | } | |
83e83ecb TP |
2351 | |
2352 | /* read the standard strings and cache them if present */ | |
2353 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
2354 | udev->manufacturer = usb_cache_string(udev, | |
2355 | udev->descriptor.iManufacturer); | |
2356 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
2357 | ||
8d8558d1 | 2358 | err = usb_enumerate_device_otg(udev); |
80da2e0d LP |
2359 | if (err < 0) |
2360 | return err; | |
2361 | ||
026f3fcb | 2362 | if (IS_ENABLED(CONFIG_USB_OTG_WHITELIST) && hcd->tpl_support && |
e5a9d621 | 2363 | !is_targeted(udev)) { |
026f3fcb PC |
2364 | /* Maybe it can talk to us, though we can't talk to it. |
2365 | * (Includes HNP test device.) | |
2366 | */ | |
e5a9d621 PC |
2367 | if (IS_ENABLED(CONFIG_USB_OTG) && (udev->bus->b_hnp_enable |
2368 | || udev->bus->is_b_host)) { | |
026f3fcb PC |
2369 | err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND); |
2370 | if (err < 0) | |
2371 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
2372 | } | |
2373 | return -ENOTSUPP; | |
2374 | } | |
2375 | ||
80da2e0d LP |
2376 | usb_detect_interface_quirks(udev); |
2377 | ||
2378 | return 0; | |
d9d16e8a IPG |
2379 | } |
2380 | ||
d35e70d5 MG |
2381 | static void set_usb_port_removable(struct usb_device *udev) |
2382 | { | |
2383 | struct usb_device *hdev = udev->parent; | |
2384 | struct usb_hub *hub; | |
2385 | u8 port = udev->portnum; | |
2386 | u16 wHubCharacteristics; | |
2387 | bool removable = true; | |
2388 | ||
2389 | if (!hdev) | |
2390 | return; | |
2391 | ||
ad493e5e | 2392 | hub = usb_hub_to_struct_hub(udev->parent); |
d35e70d5 | 2393 | |
92bfbf71 MG |
2394 | /* |
2395 | * If the platform firmware has provided information about a port, | |
2396 | * use that to determine whether it's removable. | |
2397 | */ | |
2398 | switch (hub->ports[udev->portnum - 1]->connect_type) { | |
2399 | case USB_PORT_CONNECT_TYPE_HOT_PLUG: | |
2400 | udev->removable = USB_DEVICE_REMOVABLE; | |
2401 | return; | |
2402 | case USB_PORT_CONNECT_TYPE_HARD_WIRED: | |
58339c2e | 2403 | case USB_PORT_NOT_USED: |
92bfbf71 MG |
2404 | udev->removable = USB_DEVICE_FIXED; |
2405 | return; | |
58339c2e MG |
2406 | default: |
2407 | break; | |
92bfbf71 MG |
2408 | } |
2409 | ||
2410 | /* | |
2411 | * Otherwise, check whether the hub knows whether a port is removable | |
2412 | * or not | |
2413 | */ | |
d35e70d5 MG |
2414 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
2415 | ||
2416 | if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) | |
2417 | return; | |
2418 | ||
2419 | if (hub_is_superspeed(hdev)) { | |
ca3c1539 LT |
2420 | if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) |
2421 | & (1 << port)) | |
d35e70d5 MG |
2422 | removable = false; |
2423 | } else { | |
2424 | if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) | |
2425 | removable = false; | |
2426 | } | |
2427 | ||
2428 | if (removable) | |
2429 | udev->removable = USB_DEVICE_REMOVABLE; | |
2430 | else | |
2431 | udev->removable = USB_DEVICE_FIXED; | |
a4204ff0 | 2432 | |
d35e70d5 | 2433 | } |
d9d16e8a IPG |
2434 | |
2435 | /** | |
2436 | * usb_new_device - perform initial device setup (usbcore-internal) | |
2437 | * @udev: newly addressed device (in ADDRESS state) | |
2438 | * | |
8d8558d1 AS |
2439 | * This is called with devices which have been detected but not fully |
2440 | * enumerated. The device descriptor is available, but not descriptors | |
d9d16e8a IPG |
2441 | * for any device configuration. The caller must have locked either |
2442 | * the parent hub (if udev is a normal device) or else the | |
a4b5d606 | 2443 | * usb_bus_idr_lock (if udev is a root hub). The parent's pointer to |
d9d16e8a IPG |
2444 | * udev has already been installed, but udev is not yet visible through |
2445 | * sysfs or other filesystem code. | |
2446 | * | |
d9d16e8a IPG |
2447 | * This call is synchronous, and may not be used in an interrupt context. |
2448 | * | |
2449 | * Only the hub driver or root-hub registrar should ever call this. | |
626f090c YB |
2450 | * |
2451 | * Return: Whether the device is configured properly or not. Zero if the | |
2452 | * interface was registered with the driver core; else a negative errno | |
2453 | * value. | |
2454 | * | |
d9d16e8a IPG |
2455 | */ |
2456 | int usb_new_device(struct usb_device *udev) | |
2457 | { | |
2458 | int err; | |
2459 | ||
16985408 | 2460 | if (udev->parent) { |
16985408 DS |
2461 | /* Initialize non-root-hub device wakeup to disabled; |
2462 | * device (un)configuration controls wakeup capable | |
2463 | * sysfs power/wakeup controls wakeup enabled/disabled | |
2464 | */ | |
2465 | device_init_wakeup(&udev->dev, 0); | |
16985408 DS |
2466 | } |
2467 | ||
9bbdf1e0 AS |
2468 | /* Tell the runtime-PM framework the device is active */ |
2469 | pm_runtime_set_active(&udev->dev); | |
c08512c7 | 2470 | pm_runtime_get_noresume(&udev->dev); |
fcc4a01e | 2471 | pm_runtime_use_autosuspend(&udev->dev); |
9bbdf1e0 AS |
2472 | pm_runtime_enable(&udev->dev); |
2473 | ||
c08512c7 AS |
2474 | /* By default, forbid autosuspend for all devices. It will be |
2475 | * allowed for hubs during binding. | |
2476 | */ | |
2477 | usb_disable_autosuspend(udev); | |
2478 | ||
8d8558d1 | 2479 | err = usb_enumerate_device(udev); /* Read descriptors */ |
d9d16e8a IPG |
2480 | if (err < 0) |
2481 | goto fail; | |
c6515272 SS |
2482 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
2483 | udev->devnum, udev->bus->busnum, | |
2484 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
9f8b17e6 KS |
2485 | /* export the usbdev device-node for libusb */ |
2486 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
2487 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
2488 | ||
6cd13201 AS |
2489 | /* Tell the world! */ |
2490 | announce_device(udev); | |
195af2cc | 2491 | |
b04b3156 TT |
2492 | if (udev->serial) |
2493 | add_device_randomness(udev->serial, strlen(udev->serial)); | |
2494 | if (udev->product) | |
2495 | add_device_randomness(udev->product, strlen(udev->product)); | |
2496 | if (udev->manufacturer) | |
2497 | add_device_randomness(udev->manufacturer, | |
2498 | strlen(udev->manufacturer)); | |
2499 | ||
927bc916 | 2500 | device_enable_async_suspend(&udev->dev); |
d35e70d5 | 2501 | |
a4204ff0 | 2502 | /* check whether the hub or firmware marks this port as non-removable */ |
d35e70d5 MG |
2503 | if (udev->parent) |
2504 | set_usb_port_removable(udev); | |
2505 | ||
782da727 | 2506 | /* Register the device. The device driver is responsible |
3b23dd6f AS |
2507 | * for configuring the device and invoking the add-device |
2508 | * notifier chain (used by usbfs and possibly others). | |
782da727 | 2509 | */ |
9f8b17e6 | 2510 | err = device_add(&udev->dev); |
1da177e4 LT |
2511 | if (err) { |
2512 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
2513 | goto fail; | |
2514 | } | |
9ad3d6cc | 2515 | |
fde26380 LT |
2516 | /* Create link files between child device and usb port device. */ |
2517 | if (udev->parent) { | |
ad493e5e | 2518 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
d5c3834e DW |
2519 | int port1 = udev->portnum; |
2520 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
fde26380 LT |
2521 | |
2522 | err = sysfs_create_link(&udev->dev.kobj, | |
2523 | &port_dev->dev.kobj, "port"); | |
2524 | if (err) | |
2525 | goto fail; | |
2526 | ||
2527 | err = sysfs_create_link(&port_dev->dev.kobj, | |
2528 | &udev->dev.kobj, "device"); | |
2529 | if (err) { | |
2530 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2531 | goto fail; | |
2532 | } | |
971fcd49 | 2533 | |
d5c3834e DW |
2534 | if (!test_and_set_bit(port1, hub->child_usage_bits)) |
2535 | pm_runtime_get_sync(&port_dev->dev); | |
fde26380 LT |
2536 | } |
2537 | ||
3b23dd6f | 2538 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
c08512c7 AS |
2539 | usb_mark_last_busy(udev); |
2540 | pm_runtime_put_sync_autosuspend(&udev->dev); | |
c066475e | 2541 | return err; |
1da177e4 LT |
2542 | |
2543 | fail: | |
2544 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
9bbdf1e0 AS |
2545 | pm_runtime_disable(&udev->dev); |
2546 | pm_runtime_set_suspended(&udev->dev); | |
d9d16e8a | 2547 | return err; |
1da177e4 LT |
2548 | } |
2549 | ||
93993a0a IPG |
2550 | |
2551 | /** | |
fd39c86b RD |
2552 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
2553 | * @usb_dev: USB device | |
2554 | * | |
2555 | * Move the USB device to a very basic state where interfaces are disabled | |
2556 | * and the device is in fact unconfigured and unusable. | |
93993a0a IPG |
2557 | * |
2558 | * We share a lock (that we have) with device_del(), so we need to | |
2559 | * defer its call. | |
626f090c YB |
2560 | * |
2561 | * Return: 0. | |
93993a0a IPG |
2562 | */ |
2563 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
2564 | { | |
93993a0a IPG |
2565 | usb_lock_device(usb_dev); |
2566 | if (usb_dev->authorized == 0) | |
2567 | goto out_unauthorized; | |
da307123 | 2568 | |
93993a0a IPG |
2569 | usb_dev->authorized = 0; |
2570 | usb_set_configuration(usb_dev, -1); | |
da307123 | 2571 | |
93993a0a IPG |
2572 | out_unauthorized: |
2573 | usb_unlock_device(usb_dev); | |
2574 | return 0; | |
2575 | } | |
2576 | ||
2577 | ||
2578 | int usb_authorize_device(struct usb_device *usb_dev) | |
2579 | { | |
2580 | int result = 0, c; | |
da307123 | 2581 | |
93993a0a IPG |
2582 | usb_lock_device(usb_dev); |
2583 | if (usb_dev->authorized == 1) | |
2584 | goto out_authorized; | |
da307123 | 2585 | |
93993a0a IPG |
2586 | result = usb_autoresume_device(usb_dev); |
2587 | if (result < 0) { | |
2588 | dev_err(&usb_dev->dev, | |
2589 | "can't autoresume for authorization: %d\n", result); | |
2590 | goto error_autoresume; | |
2591 | } | |
e50a322e JG |
2592 | |
2593 | if (usb_dev->wusb) { | |
2594 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
2595 | if (result < 0) { | |
2596 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
2597 | "authorization: %d\n", result); | |
2598 | goto error_device_descriptor; | |
2599 | } | |
93993a0a | 2600 | } |
da307123 | 2601 | |
93993a0a | 2602 | usb_dev->authorized = 1; |
93993a0a IPG |
2603 | /* Choose and set the configuration. This registers the interfaces |
2604 | * with the driver core and lets interface drivers bind to them. | |
2605 | */ | |
b5ea060f | 2606 | c = usb_choose_configuration(usb_dev); |
93993a0a IPG |
2607 | if (c >= 0) { |
2608 | result = usb_set_configuration(usb_dev, c); | |
2609 | if (result) { | |
2610 | dev_err(&usb_dev->dev, | |
2611 | "can't set config #%d, error %d\n", c, result); | |
2612 | /* This need not be fatal. The user can try to | |
2613 | * set other configurations. */ | |
2614 | } | |
2615 | } | |
2616 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
da307123 | 2617 | |
93993a0a | 2618 | error_device_descriptor: |
da307123 | 2619 | usb_autosuspend_device(usb_dev); |
93993a0a IPG |
2620 | error_autoresume: |
2621 | out_authorized: | |
781b2137 | 2622 | usb_unlock_device(usb_dev); /* complements locktree */ |
93993a0a IPG |
2623 | return result; |
2624 | } | |
2625 | ||
0cdd49a1 MN |
2626 | /* |
2627 | * Return 1 if port speed is SuperSpeedPlus, 0 otherwise | |
2628 | * check it from the link protocol field of the current speed ID attribute. | |
2629 | * current speed ID is got from ext port status request. Sublink speed attribute | |
2630 | * table is returned with the hub BOS SSP device capability descriptor | |
2631 | */ | |
2632 | static int port_speed_is_ssp(struct usb_device *hdev, int speed_id) | |
2633 | { | |
2634 | int ssa_count; | |
2635 | u32 ss_attr; | |
2636 | int i; | |
2637 | struct usb_ssp_cap_descriptor *ssp_cap = hdev->bos->ssp_cap; | |
2638 | ||
2639 | if (!ssp_cap) | |
2640 | return 0; | |
2641 | ||
2642 | ssa_count = le32_to_cpu(ssp_cap->bmAttributes) & | |
2643 | USB_SSP_SUBLINK_SPEED_ATTRIBS; | |
2644 | ||
2645 | for (i = 0; i <= ssa_count; i++) { | |
2646 | ss_attr = le32_to_cpu(ssp_cap->bmSublinkSpeedAttr[i]); | |
2647 | if (speed_id == (ss_attr & USB_SSP_SUBLINK_SPEED_SSID)) | |
2648 | return !!(ss_attr & USB_SSP_SUBLINK_SPEED_LP); | |
2649 | } | |
2650 | return 0; | |
2651 | } | |
93993a0a | 2652 | |
0165de09 IPG |
2653 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
2654 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
2655 | { | |
2656 | struct usb_hcd *hcd; | |
2657 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
2658 | return 0; | |
6ae706ae | 2659 | hcd = bus_to_hcd(hub->hdev->bus); |
0165de09 IPG |
2660 | return hcd->wireless; |
2661 | } | |
2662 | ||
2663 | ||
1da177e4 LT |
2664 | #define PORT_RESET_TRIES 5 |
2665 | #define SET_ADDRESS_TRIES 2 | |
2666 | #define GET_DESCRIPTOR_TRIES 2 | |
2667 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
90ab5ee9 | 2668 | #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) |
1da177e4 LT |
2669 | |
2670 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
2671 | #define HUB_SHORT_RESET_TIME 10 | |
75d7cf72 | 2672 | #define HUB_BH_RESET_TIME 50 |
1da177e4 | 2673 | #define HUB_LONG_RESET_TIME 200 |
77c7f072 | 2674 | #define HUB_RESET_TIMEOUT 800 |
1da177e4 | 2675 | |
48fc7dbd DW |
2676 | /* |
2677 | * "New scheme" enumeration causes an extra state transition to be | |
2678 | * exposed to an xhci host and causes USB3 devices to receive control | |
2679 | * commands in the default state. This has been seen to cause | |
2680 | * enumeration failures, so disable this enumeration scheme for USB3 | |
2681 | * devices. | |
2682 | */ | |
2683 | static bool use_new_scheme(struct usb_device *udev, int retry) | |
2684 | { | |
8a1b2725 | 2685 | if (udev->speed >= USB_SPEED_SUPER) |
48fc7dbd DW |
2686 | return false; |
2687 | ||
2688 | return USE_NEW_SCHEME(retry); | |
2689 | } | |
2690 | ||
025d4430 | 2691 | /* Is a USB 3.0 port in the Inactive or Compliance Mode state? |
8bea2bd3 SL |
2692 | * Port worm reset is required to recover |
2693 | */ | |
3cd12f91 DW |
2694 | static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, |
2695 | u16 portstatus) | |
10d674a8 | 2696 | { |
3cd12f91 DW |
2697 | u16 link_state; |
2698 | ||
2699 | if (!hub_is_superspeed(hub->hdev)) | |
2700 | return false; | |
2701 | ||
2702 | if (test_bit(port1, hub->warm_reset_bits)) | |
2703 | return true; | |
2704 | ||
2705 | link_state = portstatus & USB_PORT_STAT_LINK_STATE; | |
2706 | return link_state == USB_SS_PORT_LS_SS_INACTIVE | |
2707 | || link_state == USB_SS_PORT_LS_COMP_MOD; | |
10d674a8 SS |
2708 | } |
2709 | ||
1da177e4 | 2710 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2711 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2712 | { |
2713 | int delay_time, ret; | |
2714 | u16 portstatus; | |
2715 | u16 portchange; | |
0cdd49a1 | 2716 | u32 ext_portstatus = 0; |
1da177e4 LT |
2717 | |
2718 | for (delay_time = 0; | |
2719 | delay_time < HUB_RESET_TIMEOUT; | |
2720 | delay_time += delay) { | |
2721 | /* wait to give the device a chance to reset */ | |
2722 | msleep(delay); | |
2723 | ||
2724 | /* read and decode port status */ | |
0cdd49a1 MN |
2725 | if (hub_is_superspeedplus(hub->hdev)) |
2726 | ret = hub_ext_port_status(hub, port1, | |
2727 | HUB_EXT_PORT_STATUS, | |
2728 | &portstatus, &portchange, | |
2729 | &ext_portstatus); | |
2730 | else | |
2731 | ret = hub_port_status(hub, port1, &portstatus, | |
2732 | &portchange); | |
1da177e4 LT |
2733 | if (ret < 0) |
2734 | return ret; | |
2735 | ||
4f43447e | 2736 | /* The port state is unknown until the reset completes. */ |
470f0be8 SS |
2737 | if (!(portstatus & USB_PORT_STAT_RESET)) |
2738 | break; | |
1da177e4 LT |
2739 | |
2740 | /* switch to the long delay after two short delay failures */ | |
2741 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
2742 | delay = HUB_LONG_RESET_TIME; | |
2743 | ||
d99f6b41 DW |
2744 | dev_dbg(&hub->ports[port1 - 1]->dev, |
2745 | "not %sreset yet, waiting %dms\n", | |
2746 | warm ? "warm " : "", delay); | |
1da177e4 LT |
2747 | } |
2748 | ||
470f0be8 SS |
2749 | if ((portstatus & USB_PORT_STAT_RESET)) |
2750 | return -EBUSY; | |
2751 | ||
3cd12f91 | 2752 | if (hub_port_warm_reset_required(hub, port1, portstatus)) |
470f0be8 SS |
2753 | return -ENOTCONN; |
2754 | ||
2755 | /* Device went away? */ | |
2756 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
2757 | return -ENOTCONN; | |
2758 | ||
2759 | /* bomb out completely if the connection bounced. A USB 3.0 | |
2760 | * connection may bounce if multiple warm resets were issued, | |
2761 | * but the device may have successfully re-connected. Ignore it. | |
2762 | */ | |
2763 | if (!hub_is_superspeed(hub->hdev) && | |
2764 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
2765 | return -ENOTCONN; | |
2766 | ||
2767 | if (!(portstatus & USB_PORT_STAT_ENABLE)) | |
2768 | return -EBUSY; | |
2769 | ||
2770 | if (!udev) | |
2771 | return 0; | |
2772 | ||
2773 | if (hub_is_wusb(hub)) | |
2774 | udev->speed = USB_SPEED_WIRELESS; | |
0cdd49a1 MN |
2775 | else if (hub_is_superspeedplus(hub->hdev) && |
2776 | port_speed_is_ssp(hub->hdev, ext_portstatus & | |
2777 | USB_EXT_PORT_STAT_RX_SPEED_ID)) | |
2778 | udev->speed = USB_SPEED_SUPER_PLUS; | |
470f0be8 SS |
2779 | else if (hub_is_superspeed(hub->hdev)) |
2780 | udev->speed = USB_SPEED_SUPER; | |
2781 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
2782 | udev->speed = USB_SPEED_HIGH; | |
2783 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
2784 | udev->speed = USB_SPEED_LOW; | |
2785 | else | |
2786 | udev->speed = USB_SPEED_FULL; | |
2787 | return 0; | |
1da177e4 LT |
2788 | } |
2789 | ||
75d7cf72 | 2790 | /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ |
1da177e4 | 2791 | static int hub_port_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2792 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2793 | { |
2794 | int i, status; | |
a24a6078 | 2795 | u16 portchange, portstatus; |
d99f6b41 | 2796 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
1da177e4 | 2797 | |
0fe51aa5 SS |
2798 | if (!hub_is_superspeed(hub->hdev)) { |
2799 | if (warm) { | |
75d7cf72 AX |
2800 | dev_err(hub->intfdev, "only USB3 hub support " |
2801 | "warm reset\n"); | |
2802 | return -EINVAL; | |
2803 | } | |
0fe51aa5 SS |
2804 | /* Block EHCI CF initialization during the port reset. |
2805 | * Some companion controllers don't like it when they mix. | |
2806 | */ | |
2807 | down_read(&ehci_cf_port_reset_rwsem); | |
d3b9d7a9 SS |
2808 | } else if (!warm) { |
2809 | /* | |
2810 | * If the caller hasn't explicitly requested a warm reset, | |
2811 | * double check and see if one is needed. | |
2812 | */ | |
fb6d1f7d RS |
2813 | if (hub_port_status(hub, port1, &portstatus, &portchange) == 0) |
2814 | if (hub_port_warm_reset_required(hub, port1, | |
2815 | portstatus)) | |
2816 | warm = true; | |
75d7cf72 | 2817 | } |
3cd12f91 | 2818 | clear_bit(port1, hub->warm_reset_bits); |
32fe0198 | 2819 | |
1da177e4 LT |
2820 | /* Reset the port */ |
2821 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
75d7cf72 AX |
2822 | status = set_port_feature(hub->hdev, port1, (warm ? |
2823 | USB_PORT_FEAT_BH_PORT_RESET : | |
2824 | USB_PORT_FEAT_RESET)); | |
e9e88fb7 AS |
2825 | if (status == -ENODEV) { |
2826 | ; /* The hub is gone */ | |
2827 | } else if (status) { | |
d99f6b41 DW |
2828 | dev_err(&port_dev->dev, |
2829 | "cannot %sreset (err = %d)\n", | |
2830 | warm ? "warm " : "", status); | |
75d7cf72 AX |
2831 | } else { |
2832 | status = hub_port_wait_reset(hub, port1, udev, delay, | |
2833 | warm); | |
e9e88fb7 | 2834 | if (status && status != -ENOTCONN && status != -ENODEV) |
1da177e4 LT |
2835 | dev_dbg(hub->intfdev, |
2836 | "port_wait_reset: err = %d\n", | |
2837 | status); | |
2838 | } | |
2839 | ||
a24a6078 | 2840 | /* Check for disconnect or reset */ |
75d7cf72 | 2841 | if (status == 0 || status == -ENOTCONN || status == -ENODEV) { |
fb6d1f7d RS |
2842 | usb_clear_port_feature(hub->hdev, port1, |
2843 | USB_PORT_FEAT_C_RESET); | |
a24a6078 SS |
2844 | |
2845 | if (!hub_is_superspeed(hub->hdev)) | |
2846 | goto done; | |
2847 | ||
fb6d1f7d RS |
2848 | usb_clear_port_feature(hub->hdev, port1, |
2849 | USB_PORT_FEAT_C_BH_PORT_RESET); | |
2850 | usb_clear_port_feature(hub->hdev, port1, | |
2851 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
2852 | usb_clear_port_feature(hub->hdev, port1, | |
2853 | USB_PORT_FEAT_C_CONNECTION); | |
2854 | ||
a24a6078 SS |
2855 | /* |
2856 | * If a USB 3.0 device migrates from reset to an error | |
2857 | * state, re-issue the warm reset. | |
2858 | */ | |
2859 | if (hub_port_status(hub, port1, | |
2860 | &portstatus, &portchange) < 0) | |
2861 | goto done; | |
2862 | ||
3cd12f91 DW |
2863 | if (!hub_port_warm_reset_required(hub, port1, |
2864 | portstatus)) | |
a24a6078 SS |
2865 | goto done; |
2866 | ||
2867 | /* | |
2868 | * If the port is in SS.Inactive or Compliance Mode, the | |
2869 | * hot or warm reset failed. Try another warm reset. | |
2870 | */ | |
2871 | if (!warm) { | |
d99f6b41 DW |
2872 | dev_dbg(&port_dev->dev, |
2873 | "hot reset failed, warm reset\n"); | |
a24a6078 SS |
2874 | warm = true; |
2875 | } | |
1da177e4 LT |
2876 | } |
2877 | ||
d99f6b41 DW |
2878 | dev_dbg(&port_dev->dev, |
2879 | "not enabled, trying %sreset again...\n", | |
2880 | warm ? "warm " : ""); | |
1da177e4 LT |
2881 | delay = HUB_LONG_RESET_TIME; |
2882 | } | |
2883 | ||
d99f6b41 | 2884 | dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n"); |
1da177e4 | 2885 | |
75d7cf72 | 2886 | done: |
fb6d1f7d RS |
2887 | if (status == 0) { |
2888 | /* TRSTRCY = 10 ms; plus some extra */ | |
2889 | msleep(10 + 40); | |
2890 | if (udev) { | |
2891 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2892 | ||
2893 | update_devnum(udev, 0); | |
2894 | /* The xHC may think the device is already reset, | |
2895 | * so ignore the status. | |
2896 | */ | |
2897 | if (hcd->driver->reset_device) | |
2898 | hcd->driver->reset_device(hcd, udev); | |
2899 | ||
2900 | usb_set_device_state(udev, USB_STATE_DEFAULT); | |
2901 | } | |
2902 | } else { | |
2903 | if (udev) | |
2904 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
2905 | } | |
2906 | ||
0fe51aa5 | 2907 | if (!hub_is_superspeed(hub->hdev)) |
75d7cf72 | 2908 | up_read(&ehci_cf_port_reset_rwsem); |
5e467f6e | 2909 | |
75d7cf72 | 2910 | return status; |
5e467f6e AX |
2911 | } |
2912 | ||
0ed9a57e AX |
2913 | /* Check if a port is power on */ |
2914 | static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) | |
2915 | { | |
2916 | int ret = 0; | |
2917 | ||
2918 | if (hub_is_superspeed(hub->hdev)) { | |
2919 | if (portstatus & USB_SS_PORT_STAT_POWER) | |
2920 | ret = 1; | |
2921 | } else { | |
2922 | if (portstatus & USB_PORT_STAT_POWER) | |
2923 | ret = 1; | |
2924 | } | |
2925 | ||
2926 | return ret; | |
2927 | } | |
2928 | ||
5c79a1e3 DW |
2929 | static void usb_lock_port(struct usb_port *port_dev) |
2930 | __acquires(&port_dev->status_lock) | |
2931 | { | |
2932 | mutex_lock(&port_dev->status_lock); | |
2933 | __acquire(&port_dev->status_lock); | |
2934 | } | |
2935 | ||
2936 | static void usb_unlock_port(struct usb_port *port_dev) | |
2937 | __releases(&port_dev->status_lock) | |
2938 | { | |
2939 | mutex_unlock(&port_dev->status_lock); | |
2940 | __release(&port_dev->status_lock); | |
2941 | } | |
2942 | ||
d388dab7 | 2943 | #ifdef CONFIG_PM |
1da177e4 | 2944 | |
0ed9a57e AX |
2945 | /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ |
2946 | static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) | |
2947 | { | |
2948 | int ret = 0; | |
2949 | ||
2950 | if (hub_is_superspeed(hub->hdev)) { | |
2951 | if ((portstatus & USB_PORT_STAT_LINK_STATE) | |
2952 | == USB_SS_PORT_LS_U3) | |
2953 | ret = 1; | |
2954 | } else { | |
2955 | if (portstatus & USB_PORT_STAT_SUSPEND) | |
2956 | ret = 1; | |
2957 | } | |
2958 | ||
2959 | return ret; | |
2960 | } | |
b01b03f3 AS |
2961 | |
2962 | /* Determine whether the device on a port is ready for a normal resume, | |
2963 | * is ready for a reset-resume, or should be disconnected. | |
2964 | */ | |
2965 | static int check_port_resume_type(struct usb_device *udev, | |
2966 | struct usb_hub *hub, int port1, | |
7fa40910 | 2967 | int status, u16 portchange, u16 portstatus) |
b01b03f3 | 2968 | { |
d99f6b41 | 2969 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
7fa40910 | 2970 | int retries = 3; |
d99f6b41 | 2971 | |
7fa40910 | 2972 | retry: |
3cd12f91 DW |
2973 | /* Is a warm reset needed to recover the connection? */ |
2974 | if (status == 0 && udev->reset_resume | |
2975 | && hub_port_warm_reset_required(hub, port1, portstatus)) { | |
2976 | /* pass */; | |
2977 | } | |
b01b03f3 | 2978 | /* Is the device still present? */ |
3cd12f91 | 2979 | else if (status || port_is_suspended(hub, portstatus) || |
7fa40910 | 2980 | !port_is_power_on(hub, portstatus)) { |
b01b03f3 AS |
2981 | if (status >= 0) |
2982 | status = -ENODEV; | |
7fa40910 JW |
2983 | } else if (!(portstatus & USB_PORT_STAT_CONNECTION)) { |
2984 | if (retries--) { | |
2985 | usleep_range(200, 300); | |
2986 | status = hub_port_status(hub, port1, &portstatus, | |
2987 | &portchange); | |
2988 | goto retry; | |
2989 | } | |
2990 | status = -ENODEV; | |
b01b03f3 AS |
2991 | } |
2992 | ||
86c57edf AS |
2993 | /* Can't do a normal resume if the port isn't enabled, |
2994 | * so try a reset-resume instead. | |
2995 | */ | |
2996 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { | |
2997 | if (udev->persist_enabled) | |
2998 | udev->reset_resume = 1; | |
2999 | else | |
3000 | status = -ENODEV; | |
3001 | } | |
b01b03f3 AS |
3002 | |
3003 | if (status) { | |
d99f6b41 DW |
3004 | dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n", |
3005 | portchange, portstatus, status); | |
b01b03f3 AS |
3006 | } else if (udev->reset_resume) { |
3007 | ||
3008 | /* Late port handoff can set status-change bits */ | |
3009 | if (portchange & USB_PORT_STAT_C_CONNECTION) | |
ad493e5e | 3010 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
3011 | USB_PORT_FEAT_C_CONNECTION); |
3012 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
ad493e5e | 3013 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
3014 | USB_PORT_FEAT_C_ENABLE); |
3015 | } | |
3016 | ||
3017 | return status; | |
3018 | } | |
3019 | ||
f74631e3 SS |
3020 | int usb_disable_ltm(struct usb_device *udev) |
3021 | { | |
3022 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
3023 | ||
3024 | /* Check if the roothub and device supports LTM. */ | |
3025 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
3026 | !usb_device_supports_ltm(udev)) | |
3027 | return 0; | |
3028 | ||
3029 | /* Clear Feature LTM Enable can only be sent if the device is | |
3030 | * configured. | |
3031 | */ | |
3032 | if (!udev->actconfig) | |
3033 | return 0; | |
3034 | ||
3035 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3036 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
3037 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
3038 | USB_CTRL_SET_TIMEOUT); | |
3039 | } | |
3040 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
3041 | ||
3042 | void usb_enable_ltm(struct usb_device *udev) | |
3043 | { | |
3044 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
3045 | ||
3046 | /* Check if the roothub and device supports LTM. */ | |
3047 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
3048 | !usb_device_supports_ltm(udev)) | |
3049 | return; | |
3050 | ||
3051 | /* Set Feature LTM Enable can only be sent if the device is | |
3052 | * configured. | |
3053 | */ | |
3054 | if (!udev->actconfig) | |
3055 | return; | |
3056 | ||
3057 | usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3058 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
3059 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
3060 | USB_CTRL_SET_TIMEOUT); | |
3061 | } | |
3062 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
3063 | ||
54a3ac0c | 3064 | /* |
28e86165 | 3065 | * usb_enable_remote_wakeup - enable remote wakeup for a device |
54a3ac0c LT |
3066 | * @udev: target device |
3067 | * | |
28e86165 AS |
3068 | * For USB-2 devices: Set the device's remote wakeup feature. |
3069 | * | |
3070 | * For USB-3 devices: Assume there's only one function on the device and | |
3071 | * enable remote wake for the first interface. FIXME if the interface | |
3072 | * association descriptor shows there's more than one function. | |
54a3ac0c | 3073 | */ |
28e86165 | 3074 | static int usb_enable_remote_wakeup(struct usb_device *udev) |
54a3ac0c | 3075 | { |
28e86165 AS |
3076 | if (udev->speed < USB_SPEED_SUPER) |
3077 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3078 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
3079 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, | |
3080 | USB_CTRL_SET_TIMEOUT); | |
3081 | else | |
3082 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3083 | USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, | |
3084 | USB_INTRF_FUNC_SUSPEND, | |
3085 | USB_INTRF_FUNC_SUSPEND_RW | | |
3086 | USB_INTRF_FUNC_SUSPEND_LP, | |
3087 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3088 | } | |
3089 | ||
3090 | /* | |
3091 | * usb_disable_remote_wakeup - disable remote wakeup for a device | |
3092 | * @udev: target device | |
3093 | * | |
3094 | * For USB-2 devices: Clear the device's remote wakeup feature. | |
3095 | * | |
3096 | * For USB-3 devices: Assume there's only one function on the device and | |
3097 | * disable remote wake for the first interface. FIXME if the interface | |
3098 | * association descriptor shows there's more than one function. | |
3099 | */ | |
3100 | static int usb_disable_remote_wakeup(struct usb_device *udev) | |
3101 | { | |
3102 | if (udev->speed < USB_SPEED_SUPER) | |
3103 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3104 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
3105 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, | |
3106 | USB_CTRL_SET_TIMEOUT); | |
3107 | else | |
3108 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
54a3ac0c LT |
3109 | USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, |
3110 | USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, | |
3111 | USB_CTRL_SET_TIMEOUT); | |
3112 | } | |
1da177e4 | 3113 | |
e583d9db AS |
3114 | /* Count of wakeup-enabled devices at or below udev */ |
3115 | static unsigned wakeup_enabled_descendants(struct usb_device *udev) | |
3116 | { | |
3117 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); | |
3118 | ||
3119 | return udev->do_remote_wakeup + | |
3120 | (hub ? hub->wakeup_enabled_descendants : 0); | |
3121 | } | |
3122 | ||
1da177e4 | 3123 | /* |
624d6c07 AS |
3124 | * usb_port_suspend - suspend a usb device's upstream port |
3125 | * @udev: device that's no longer in active use, not a root hub | |
3126 | * Context: must be able to sleep; device not locked; pm locks held | |
3127 | * | |
3128 | * Suspends a USB device that isn't in active use, conserving power. | |
3129 | * Devices may wake out of a suspend, if anything important happens, | |
3130 | * using the remote wakeup mechanism. They may also be taken out of | |
3131 | * suspend by the host, using usb_port_resume(). It's also routine | |
3132 | * to disconnect devices while they are suspended. | |
3133 | * | |
3134 | * This only affects the USB hardware for a device; its interfaces | |
3135 | * (and, for hubs, child devices) must already have been suspended. | |
3136 | * | |
1da177e4 LT |
3137 | * Selective port suspend reduces power; most suspended devices draw |
3138 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
3139 | * All devices below the suspended port are also suspended. | |
3140 | * | |
3141 | * Devices leave suspend state when the host wakes them up. Some devices | |
3142 | * also support "remote wakeup", where the device can activate the USB | |
3143 | * tree above them to deliver data, such as a keypress or packet. In | |
3144 | * some cases, this wakes the USB host. | |
624d6c07 AS |
3145 | * |
3146 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
3147 | * between a pair of dual-role devices. That will change roles, such | |
3148 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
3149 | * | |
3150 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
3151 | * to ACPI D2, "may cause the device to lose some context". | |
3152 | * State transitions include: | |
3153 | * | |
3154 | * - suspend, resume ... when the VBUS power link stays live | |
3155 | * - suspend, disconnect ... VBUS lost | |
3156 | * | |
3157 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
3158 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
3159 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
37ebb549 | 3160 | * Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq |
624d6c07 AS |
3161 | * timer, no SRP, no requests through sysfs. |
3162 | * | |
e583d9db AS |
3163 | * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get |
3164 | * suspended until their bus goes into global suspend (i.e., the root | |
0aa2832d AS |
3165 | * hub is suspended). Nevertheless, we change @udev->state to |
3166 | * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual | |
3167 | * upstream port setting is stored in @udev->port_is_suspended. | |
624d6c07 AS |
3168 | * |
3169 | * Returns 0 on success, else negative errno. | |
1da177e4 | 3170 | */ |
65bfd296 | 3171 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 3172 | { |
ad493e5e LT |
3173 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
3174 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
3175 | int port1 = udev->portnum; |
3176 | int status; | |
0aa2832d | 3177 | bool really_suspend = true; |
1da177e4 | 3178 | |
5c79a1e3 DW |
3179 | usb_lock_port(port_dev); |
3180 | ||
1da177e4 LT |
3181 | /* enable remote wakeup when appropriate; this lets the device |
3182 | * wake up the upstream hub (including maybe the root hub). | |
3183 | * | |
3184 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
3185 | * we don't explicitly enable it here. | |
3186 | */ | |
645daaab | 3187 | if (udev->do_remote_wakeup) { |
28e86165 | 3188 | status = usb_enable_remote_wakeup(udev); |
0c487206 | 3189 | if (status) { |
624d6c07 AS |
3190 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
3191 | status); | |
0c487206 | 3192 | /* bail if autosuspend is requested */ |
5b1b0b81 | 3193 | if (PMSG_IS_AUTO(msg)) |
4fae6f0f | 3194 | goto err_wakeup; |
0c487206 | 3195 | } |
1da177e4 LT |
3196 | } |
3197 | ||
65580b43 AX |
3198 | /* disable USB2 hardware LPM */ |
3199 | if (udev->usb2_hw_lpm_enabled == 1) | |
3200 | usb_set_usb2_hardware_lpm(udev, 0); | |
3201 | ||
f74631e3 | 3202 | if (usb_disable_ltm(udev)) { |
4fae6f0f AS |
3203 | dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); |
3204 | status = -ENOMEM; | |
3205 | if (PMSG_IS_AUTO(msg)) | |
3206 | goto err_ltm; | |
f74631e3 | 3207 | } |
8306095f | 3208 | if (usb_unlocked_disable_lpm(udev)) { |
4fae6f0f AS |
3209 | dev_err(&udev->dev, "Failed to disable LPM before suspend\n."); |
3210 | status = -ENOMEM; | |
3211 | if (PMSG_IS_AUTO(msg)) | |
3212 | goto err_lpm3; | |
8306095f SS |
3213 | } |
3214 | ||
1da177e4 | 3215 | /* see 7.1.7.6 */ |
a7114230 | 3216 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 3217 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); |
e583d9db | 3218 | |
0aa2832d AS |
3219 | /* |
3220 | * For system suspend, we do not need to enable the suspend feature | |
3221 | * on individual USB-2 ports. The devices will automatically go | |
3222 | * into suspend a few ms after the root hub stops sending packets. | |
3223 | * The USB 2.0 spec calls this "global suspend". | |
e583d9db AS |
3224 | * |
3225 | * However, many USB hubs have a bug: They don't relay wakeup requests | |
3226 | * from a downstream port if the port's suspend feature isn't on. | |
3227 | * Therefore we will turn on the suspend feature if udev or any of its | |
3228 | * descendants is enabled for remote wakeup. | |
0aa2832d | 3229 | */ |
e583d9db AS |
3230 | else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) |
3231 | status = set_port_feature(hub->hdev, port1, | |
3232 | USB_PORT_FEAT_SUSPEND); | |
0aa2832d AS |
3233 | else { |
3234 | really_suspend = false; | |
3235 | status = 0; | |
3236 | } | |
1da177e4 | 3237 | if (status) { |
d99f6b41 | 3238 | dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status); |
cbb33004 | 3239 | |
4fae6f0f AS |
3240 | /* Try to enable USB3 LPM and LTM again */ |
3241 | usb_unlocked_enable_lpm(udev); | |
3242 | err_lpm3: | |
3243 | usb_enable_ltm(udev); | |
3244 | err_ltm: | |
c3e751e4 AX |
3245 | /* Try to enable USB2 hardware LPM again */ |
3246 | if (udev->usb2_hw_lpm_capable == 1) | |
3247 | usb_set_usb2_hardware_lpm(udev, 1); | |
3248 | ||
4fae6f0f AS |
3249 | if (udev->do_remote_wakeup) |
3250 | (void) usb_disable_remote_wakeup(udev); | |
3251 | err_wakeup: | |
8306095f | 3252 | |
cbb33004 | 3253 | /* System sleep transitions should never fail */ |
5b1b0b81 | 3254 | if (!PMSG_IS_AUTO(msg)) |
cbb33004 | 3255 | status = 0; |
1da177e4 | 3256 | } else { |
30b1a7a3 AS |
3257 | dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", |
3258 | (PMSG_IS_AUTO(msg) ? "auto-" : ""), | |
3259 | udev->do_remote_wakeup); | |
0aa2832d AS |
3260 | if (really_suspend) { |
3261 | udev->port_is_suspended = 1; | |
e583d9db AS |
3262 | |
3263 | /* device has up to 10 msec to fully suspend */ | |
0aa2832d AS |
3264 | msleep(10); |
3265 | } | |
e583d9db | 3266 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
1da177e4 | 3267 | } |
ad493e5e | 3268 | |
d5c3834e DW |
3269 | if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled |
3270 | && test_and_clear_bit(port1, hub->child_usage_bits)) | |
98a4f1ff | 3271 | pm_runtime_put_sync(&port_dev->dev); |
ad493e5e | 3272 | |
c08512c7 | 3273 | usb_mark_last_busy(hub->hdev); |
5c79a1e3 DW |
3274 | |
3275 | usb_unlock_port(port_dev); | |
1da177e4 LT |
3276 | return status; |
3277 | } | |
3278 | ||
1da177e4 | 3279 | /* |
390a8c34 DB |
3280 | * If the USB "suspend" state is in use (rather than "global suspend"), |
3281 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 3282 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
3283 | * hardware resume signaling is finished, either because of selective |
3284 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
3285 | * in the tree that's rooted at this device. | |
54515fe5 AS |
3286 | * |
3287 | * If @udev->reset_resume is set then the device is reset before the | |
3288 | * status check is done. | |
1da177e4 | 3289 | */ |
140d8f68 | 3290 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 3291 | { |
54515fe5 | 3292 | int status = 0; |
07e72b95 | 3293 | u16 devstatus = 0; |
1da177e4 LT |
3294 | |
3295 | /* caller owns the udev device lock */ | |
b9cef6c3 WF |
3296 | dev_dbg(&udev->dev, "%s\n", |
3297 | udev->reset_resume ? "finish reset-resume" : "finish resume"); | |
1da177e4 LT |
3298 | |
3299 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
3300 | * state the device resumes to. Linux currently won't see the | |
3301 | * first two on the host side; they'd be inside hub_port_init() | |
37ebb549 | 3302 | * during many timeouts, but hub_wq can't suspend until later. |
1da177e4 LT |
3303 | */ |
3304 | usb_set_device_state(udev, udev->actconfig | |
3305 | ? USB_STATE_CONFIGURED | |
3306 | : USB_STATE_ADDRESS); | |
1da177e4 | 3307 | |
54515fe5 AS |
3308 | /* 10.5.4.5 says not to reset a suspended port if the attached |
3309 | * device is enabled for remote wakeup. Hence the reset | |
3310 | * operation is carried out here, after the port has been | |
3311 | * resumed. | |
3312 | */ | |
1d10255c AS |
3313 | if (udev->reset_resume) { |
3314 | /* | |
3315 | * If the device morphs or switches modes when it is reset, | |
3316 | * we don't want to perform a reset-resume. We'll fail the | |
3317 | * resume, which will cause a logical disconnect, and then | |
3318 | * the device will be rediscovered. | |
3319 | */ | |
86c57edf | 3320 | retry_reset_resume: |
1d10255c AS |
3321 | if (udev->quirks & USB_QUIRK_RESET) |
3322 | status = -ENODEV; | |
3323 | else | |
3324 | status = usb_reset_and_verify_device(udev); | |
3325 | } | |
54515fe5 | 3326 | |
469271f8 MB |
3327 | /* 10.5.4.5 says be sure devices in the tree are still there. |
3328 | * For now let's assume the device didn't go crazy on resume, | |
1da177e4 LT |
3329 | * and device drivers will know about any resume quirks. |
3330 | */ | |
54515fe5 | 3331 | if (status == 0) { |
46dede46 | 3332 | devstatus = 0; |
54515fe5 | 3333 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
86c57edf AS |
3334 | |
3335 | /* If a normal resume failed, try doing a reset-resume */ | |
3336 | if (status && !udev->reset_resume && udev->persist_enabled) { | |
3337 | dev_dbg(&udev->dev, "retry with reset-resume\n"); | |
3338 | udev->reset_resume = 1; | |
3339 | goto retry_reset_resume; | |
3340 | } | |
54515fe5 | 3341 | } |
b40b7a90 | 3342 | |
624d6c07 AS |
3343 | if (status) { |
3344 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
3345 | status); | |
07e72b95 ON |
3346 | /* |
3347 | * There are a few quirky devices which violate the standard | |
3348 | * by claiming to have remote wakeup enabled after a reset, | |
3349 | * which crash if the feature is cleared, hence check for | |
3350 | * udev->reset_resume | |
3351 | */ | |
3352 | } else if (udev->actconfig && !udev->reset_resume) { | |
28e86165 | 3353 | if (udev->speed < USB_SPEED_SUPER) { |
54a3ac0c | 3354 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) |
28e86165 | 3355 | status = usb_disable_remote_wakeup(udev); |
54a3ac0c LT |
3356 | } else { |
3357 | status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, | |
3358 | &devstatus); | |
54a3ac0c LT |
3359 | if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP |
3360 | | USB_INTRF_STAT_FUNC_RW)) | |
28e86165 | 3361 | status = usb_disable_remote_wakeup(udev); |
4bf0ba86 | 3362 | } |
54a3ac0c LT |
3363 | |
3364 | if (status) | |
3365 | dev_dbg(&udev->dev, | |
3366 | "disable remote wakeup, status %d\n", | |
3367 | status); | |
1da177e4 | 3368 | status = 0; |
1da177e4 LT |
3369 | } |
3370 | return status; | |
3371 | } | |
3372 | ||
a40178b2 PA |
3373 | /* |
3374 | * There are some SS USB devices which take longer time for link training. | |
3375 | * XHCI specs 4.19.4 says that when Link training is successful, port | |
6b82b122 | 3376 | * sets CCS bit to 1. So if SW reads port status before successful link |
a40178b2 PA |
3377 | * training, then it will not find device to be present. |
3378 | * USB Analyzer log with such buggy devices show that in some cases | |
3379 | * device switch on the RX termination after long delay of host enabling | |
3380 | * the VBUS. In few other cases it has been seen that device fails to | |
3381 | * negotiate link training in first attempt. It has been | |
3382 | * reported till now that few devices take as long as 2000 ms to train | |
3383 | * the link after host enabling its VBUS and termination. Following | |
3384 | * routine implements a 2000 ms timeout for link training. If in a case | |
3385 | * link trains before timeout, loop will exit earlier. | |
3386 | * | |
6b82b122 AC |
3387 | * There are also some 2.0 hard drive based devices and 3.0 thumb |
3388 | * drives that, when plugged into a 2.0 only port, take a long | |
3389 | * time to set CCS after VBUS enable. | |
3390 | * | |
a40178b2 PA |
3391 | * FIXME: If a device was connected before suspend, but was removed |
3392 | * while system was asleep, then the loop in the following routine will | |
3393 | * only exit at timeout. | |
3394 | * | |
6b82b122 | 3395 | * This routine should only be called when persist is enabled. |
a40178b2 | 3396 | */ |
6b82b122 | 3397 | static int wait_for_connected(struct usb_device *udev, |
a40178b2 PA |
3398 | struct usb_hub *hub, int *port1, |
3399 | u16 *portchange, u16 *portstatus) | |
3400 | { | |
3401 | int status = 0, delay_ms = 0; | |
3402 | ||
3403 | while (delay_ms < 2000) { | |
3404 | if (status || *portstatus & USB_PORT_STAT_CONNECTION) | |
3405 | break; | |
3406 | msleep(20); | |
3407 | delay_ms += 20; | |
3408 | status = hub_port_status(hub, *port1, portstatus, portchange); | |
3409 | } | |
6b82b122 | 3410 | dev_dbg(&udev->dev, "Waited %dms for CONNECT\n", delay_ms); |
a40178b2 PA |
3411 | return status; |
3412 | } | |
3413 | ||
624d6c07 AS |
3414 | /* |
3415 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
3416 | * @udev: device to re-activate, not a root hub | |
3417 | * Context: must be able to sleep; device not locked; pm locks held | |
3418 | * | |
3419 | * This will re-activate the suspended device, increasing power usage | |
3420 | * while letting drivers communicate again with its endpoints. | |
3421 | * USB resume explicitly guarantees that the power session between | |
3422 | * the host and the device is the same as it was when the device | |
3423 | * suspended. | |
3424 | * | |
feccc30d AS |
3425 | * If @udev->reset_resume is set then this routine won't check that the |
3426 | * port is still enabled. Furthermore, finish_port_resume() above will | |
54515fe5 AS |
3427 | * reset @udev. The end result is that a broken power session can be |
3428 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
3429 | * | |
3430 | * For example, if a host controller doesn't maintain VBUS suspend current | |
3431 | * during a system sleep or is reset when the system wakes up, all the USB | |
3432 | * power sessions below it will be broken. This is especially troublesome | |
3433 | * for mass-storage devices containing mounted filesystems, since the | |
3434 | * device will appear to have disconnected and all the memory mappings | |
3435 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
3436 | * made to appear as if it had not disconnected. | |
3437 | * | |
742120c6 | 3438 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
feccc30d | 3439 | * every effort to insure that the same device is present after the |
54515fe5 AS |
3440 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
3441 | * quite possible for a device to remain unaltered but its media to be | |
3442 | * changed. If the user replaces a flash memory card while the system is | |
3443 | * asleep, he will have only himself to blame when the filesystem on the | |
3444 | * new card is corrupted and the system crashes. | |
3445 | * | |
624d6c07 AS |
3446 | * Returns 0 on success, else negative errno. |
3447 | */ | |
65bfd296 | 3448 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 3449 | { |
ad493e5e LT |
3450 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
3451 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
3452 | int port1 = udev->portnum; |
3453 | int status; | |
3454 | u16 portchange, portstatus; | |
d25450c6 | 3455 | |
d5c3834e | 3456 | if (!test_and_set_bit(port1, hub->child_usage_bits)) { |
ad493e5e | 3457 | status = pm_runtime_get_sync(&port_dev->dev); |
ad493e5e LT |
3458 | if (status < 0) { |
3459 | dev_dbg(&udev->dev, "can't resume usb port, status %d\n", | |
3460 | status); | |
3461 | return status; | |
3462 | } | |
3463 | } | |
3464 | ||
5c79a1e3 DW |
3465 | usb_lock_port(port_dev); |
3466 | ||
d25450c6 AS |
3467 | /* Skip the initial Clear-Suspend step for a remote wakeup */ |
3468 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
0ed9a57e | 3469 | if (status == 0 && !port_is_suspended(hub, portstatus)) |
d25450c6 | 3470 | goto SuspendCleared; |
1da177e4 | 3471 | |
1da177e4 | 3472 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
a7114230 | 3473 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 3474 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); |
a7114230 | 3475 | else |
ad493e5e | 3476 | status = usb_clear_port_feature(hub->hdev, |
a7114230 | 3477 | port1, USB_PORT_FEAT_SUSPEND); |
1da177e4 | 3478 | if (status) { |
d99f6b41 | 3479 | dev_dbg(&port_dev->dev, "can't resume, status %d\n", status); |
1da177e4 | 3480 | } else { |
bbc78c07 | 3481 | /* drive resume for USB_RESUME_TIMEOUT msec */ |
686314cf | 3482 | dev_dbg(&udev->dev, "usb %sresume\n", |
5b1b0b81 | 3483 | (PMSG_IS_AUTO(msg) ? "auto-" : "")); |
bbc78c07 | 3484 | msleep(USB_RESUME_TIMEOUT); |
1da177e4 | 3485 | |
1da177e4 LT |
3486 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
3487 | * stop resume signaling. Then finish the resume | |
3488 | * sequence. | |
3489 | */ | |
d25450c6 | 3490 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 | 3491 | |
b01b03f3 AS |
3492 | /* TRSMRCY = 10 msec */ |
3493 | msleep(10); | |
3494 | } | |
3495 | ||
54515fe5 | 3496 | SuspendCleared: |
b01b03f3 | 3497 | if (status == 0) { |
bfd1e910 | 3498 | udev->port_is_suspended = 0; |
a7114230 AX |
3499 | if (hub_is_superspeed(hub->hdev)) { |
3500 | if (portchange & USB_PORT_STAT_C_LINK_STATE) | |
ad493e5e | 3501 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3502 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
3503 | } else { | |
3504 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
ad493e5e | 3505 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3506 | USB_PORT_FEAT_C_SUSPEND); |
3507 | } | |
1da177e4 | 3508 | } |
1da177e4 | 3509 | |
6b82b122 AC |
3510 | if (udev->persist_enabled) |
3511 | status = wait_for_connected(udev, hub, &port1, &portchange, | |
a40178b2 PA |
3512 | &portstatus); |
3513 | ||
b01b03f3 AS |
3514 | status = check_port_resume_type(udev, |
3515 | hub, port1, status, portchange, portstatus); | |
54515fe5 AS |
3516 | if (status == 0) |
3517 | status = finish_port_resume(udev); | |
3518 | if (status < 0) { | |
3519 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
3520 | hub_port_logical_disconnect(hub, port1); | |
65580b43 AX |
3521 | } else { |
3522 | /* Try to enable USB2 hardware LPM */ | |
3523 | if (udev->usb2_hw_lpm_capable == 1) | |
3524 | usb_set_usb2_hardware_lpm(udev, 1); | |
8306095f | 3525 | |
f74631e3 SS |
3526 | /* Try to enable USB3 LTM and LPM */ |
3527 | usb_enable_ltm(udev); | |
8306095f | 3528 | usb_unlocked_enable_lpm(udev); |
54515fe5 | 3529 | } |
65580b43 | 3530 | |
5c79a1e3 DW |
3531 | usb_unlock_port(port_dev); |
3532 | ||
1da177e4 LT |
3533 | return status; |
3534 | } | |
3535 | ||
0534d468 | 3536 | int usb_remote_wakeup(struct usb_device *udev) |
1da177e4 LT |
3537 | { |
3538 | int status = 0; | |
3539 | ||
5c79a1e3 | 3540 | usb_lock_device(udev); |
1da177e4 | 3541 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 3542 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
9bbdf1e0 AS |
3543 | status = usb_autoresume_device(udev); |
3544 | if (status == 0) { | |
3545 | /* Let the drivers do their thing, then... */ | |
3546 | usb_autosuspend_device(udev); | |
3547 | } | |
1da177e4 | 3548 | } |
5c79a1e3 | 3549 | usb_unlock_device(udev); |
1da177e4 LT |
3550 | return status; |
3551 | } | |
3552 | ||
7e73be22 DW |
3553 | /* Returns 1 if there was a remote wakeup and a connect status change. */ |
3554 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, | |
3555 | u16 portstatus, u16 portchange) | |
3556 | __must_hold(&port_dev->status_lock) | |
3557 | { | |
3558 | struct usb_port *port_dev = hub->ports[port - 1]; | |
3559 | struct usb_device *hdev; | |
3560 | struct usb_device *udev; | |
3561 | int connect_change = 0; | |
3562 | int ret; | |
3563 | ||
3564 | hdev = hub->hdev; | |
3565 | udev = port_dev->child; | |
3566 | if (!hub_is_superspeed(hdev)) { | |
3567 | if (!(portchange & USB_PORT_STAT_C_SUSPEND)) | |
3568 | return 0; | |
3569 | usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); | |
3570 | } else { | |
3571 | if (!udev || udev->state != USB_STATE_SUSPENDED || | |
3572 | (portstatus & USB_PORT_STAT_LINK_STATE) != | |
3573 | USB_SS_PORT_LS_U0) | |
3574 | return 0; | |
3575 | } | |
3576 | ||
3577 | if (udev) { | |
3578 | /* TRSMRCY = 10 msec */ | |
3579 | msleep(10); | |
3580 | ||
3581 | usb_unlock_port(port_dev); | |
3582 | ret = usb_remote_wakeup(udev); | |
3583 | usb_lock_port(port_dev); | |
3584 | if (ret < 0) | |
3585 | connect_change = 1; | |
3586 | } else { | |
3587 | ret = -ENODEV; | |
3588 | hub_port_disable(hub, port, 1); | |
3589 | } | |
3590 | dev_dbg(&port_dev->dev, "resume, status %d\n", ret); | |
3591 | return connect_change; | |
3592 | } | |
3593 | ||
e6f30dea ML |
3594 | static int check_ports_changed(struct usb_hub *hub) |
3595 | { | |
3596 | int port1; | |
3597 | ||
3598 | for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { | |
3599 | u16 portstatus, portchange; | |
3600 | int status; | |
3601 | ||
3602 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
3603 | if (!status && portchange) | |
3604 | return 1; | |
3605 | } | |
3606 | return 0; | |
3607 | } | |
3608 | ||
db690874 | 3609 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 | 3610 | { |
17248569 | 3611 | struct usb_hub *hub = usb_get_intfdata(intf); |
1da177e4 LT |
3612 | struct usb_device *hdev = hub->hdev; |
3613 | unsigned port1; | |
4296c70a | 3614 | int status; |
1da177e4 | 3615 | |
e583d9db AS |
3616 | /* |
3617 | * Warn if children aren't already suspended. | |
3618 | * Also, add up the number of wakeup-enabled descendants. | |
3619 | */ | |
3620 | hub->wakeup_enabled_descendants = 0; | |
1da177e4 | 3621 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
d99f6b41 DW |
3622 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
3623 | struct usb_device *udev = port_dev->child; | |
1da177e4 | 3624 | |
6840d255 | 3625 | if (udev && udev->can_submit) { |
b658b8f5 DW |
3626 | dev_warn(&port_dev->dev, "device %s not suspended yet\n", |
3627 | dev_name(&udev->dev)); | |
5b1b0b81 | 3628 | if (PMSG_IS_AUTO(msg)) |
cbb33004 | 3629 | return -EBUSY; |
c9f89fa4 | 3630 | } |
e583d9db AS |
3631 | if (udev) |
3632 | hub->wakeup_enabled_descendants += | |
3633 | wakeup_enabled_descendants(udev); | |
1da177e4 | 3634 | } |
e6f30dea ML |
3635 | |
3636 | if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { | |
3637 | /* check if there are changes pending on hub ports */ | |
3638 | if (check_ports_changed(hub)) { | |
3639 | if (PMSG_IS_AUTO(msg)) | |
3640 | return -EBUSY; | |
3641 | pm_wakeup_event(&hdev->dev, 2000); | |
3642 | } | |
3643 | } | |
3644 | ||
4296c70a SS |
3645 | if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { |
3646 | /* Enable hub to send remote wakeup for all ports. */ | |
3647 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { | |
3648 | status = set_port_feature(hdev, | |
3649 | port1 | | |
3650 | USB_PORT_FEAT_REMOTE_WAKE_CONNECT | | |
3651 | USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | | |
3652 | USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, | |
3653 | USB_PORT_FEAT_REMOTE_WAKE_MASK); | |
3654 | } | |
3655 | } | |
1da177e4 | 3656 | |
441b62c1 | 3657 | dev_dbg(&intf->dev, "%s\n", __func__); |
40f122f3 | 3658 | |
37ebb549 | 3659 | /* stop hub_wq and related activity */ |
4330354f | 3660 | hub_quiesce(hub, HUB_SUSPEND); |
b6f6436d | 3661 | return 0; |
1da177e4 LT |
3662 | } |
3663 | ||
3664 | static int hub_resume(struct usb_interface *intf) | |
3665 | { | |
5e6effae | 3666 | struct usb_hub *hub = usb_get_intfdata(intf); |
40f122f3 | 3667 | |
5e6effae | 3668 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3669 | hub_activate(hub, HUB_RESUME); |
1da177e4 LT |
3670 | return 0; |
3671 | } | |
3672 | ||
b41a60ec | 3673 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 3674 | { |
b41a60ec | 3675 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf | 3676 | |
5e6effae | 3677 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3678 | hub_activate(hub, HUB_RESET_RESUME); |
f07600cf AS |
3679 | return 0; |
3680 | } | |
3681 | ||
54515fe5 AS |
3682 | /** |
3683 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
3684 | * @rhdev: struct usb_device for the root hub | |
3685 | * | |
3686 | * The USB host controller driver calls this function when its root hub | |
3687 | * is resumed and Vbus power has been interrupted or the controller | |
feccc30d AS |
3688 | * has been reset. The routine marks @rhdev as having lost power. |
3689 | * When the hub driver is resumed it will take notice and carry out | |
3690 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; | |
3691 | * the others will be disconnected. | |
54515fe5 AS |
3692 | */ |
3693 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
3694 | { | |
3695 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
3696 | rhdev->reset_resume = 1; | |
3697 | } | |
3698 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
3699 | ||
1ea7e0e8 SS |
3700 | static const char * const usb3_lpm_names[] = { |
3701 | "U0", | |
3702 | "U1", | |
3703 | "U2", | |
3704 | "U3", | |
3705 | }; | |
3706 | ||
3707 | /* | |
3708 | * Send a Set SEL control transfer to the device, prior to enabling | |
3709 | * device-initiated U1 or U2. This lets the device know the exit latencies from | |
3710 | * the time the device initiates a U1 or U2 exit, to the time it will receive a | |
3711 | * packet from the host. | |
3712 | * | |
3713 | * This function will fail if the SEL or PEL values for udev are greater than | |
3714 | * the maximum allowed values for the link state to be enabled. | |
3715 | */ | |
3716 | static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) | |
3717 | { | |
3718 | struct usb_set_sel_req *sel_values; | |
3719 | unsigned long long u1_sel; | |
3720 | unsigned long long u1_pel; | |
3721 | unsigned long long u2_sel; | |
3722 | unsigned long long u2_pel; | |
3723 | int ret; | |
3724 | ||
38d7f688 XR |
3725 | if (udev->state != USB_STATE_CONFIGURED) |
3726 | return 0; | |
3727 | ||
1ea7e0e8 SS |
3728 | /* Convert SEL and PEL stored in ns to us */ |
3729 | u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); | |
3730 | u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); | |
3731 | u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); | |
3732 | u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); | |
3733 | ||
3734 | /* | |
3735 | * Make sure that the calculated SEL and PEL values for the link | |
3736 | * state we're enabling aren't bigger than the max SEL/PEL | |
3737 | * value that will fit in the SET SEL control transfer. | |
3738 | * Otherwise the device would get an incorrect idea of the exit | |
3739 | * latency for the link state, and could start a device-initiated | |
3740 | * U1/U2 when the exit latencies are too high. | |
3741 | */ | |
3742 | if ((state == USB3_LPM_U1 && | |
3743 | (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || | |
3744 | u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || | |
3745 | (state == USB3_LPM_U2 && | |
3746 | (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || | |
3747 | u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { | |
1510a1a2 | 3748 | dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", |
1ea7e0e8 SS |
3749 | usb3_lpm_names[state], u1_sel, u1_pel); |
3750 | return -EINVAL; | |
3751 | } | |
3752 | ||
3753 | /* | |
3754 | * If we're enabling device-initiated LPM for one link state, | |
3755 | * but the other link state has a too high SEL or PEL value, | |
3756 | * just set those values to the max in the Set SEL request. | |
3757 | */ | |
3758 | if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) | |
3759 | u1_sel = USB3_LPM_MAX_U1_SEL_PEL; | |
3760 | ||
3761 | if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) | |
3762 | u1_pel = USB3_LPM_MAX_U1_SEL_PEL; | |
3763 | ||
3764 | if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) | |
3765 | u2_sel = USB3_LPM_MAX_U2_SEL_PEL; | |
3766 | ||
3767 | if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) | |
3768 | u2_pel = USB3_LPM_MAX_U2_SEL_PEL; | |
3769 | ||
3770 | /* | |
3771 | * usb_enable_lpm() can be called as part of a failed device reset, | |
3772 | * which may be initiated by an error path of a mass storage driver. | |
3773 | * Therefore, use GFP_NOIO. | |
3774 | */ | |
3775 | sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); | |
3776 | if (!sel_values) | |
3777 | return -ENOMEM; | |
3778 | ||
3779 | sel_values->u1_sel = u1_sel; | |
3780 | sel_values->u1_pel = u1_pel; | |
3781 | sel_values->u2_sel = cpu_to_le16(u2_sel); | |
3782 | sel_values->u2_pel = cpu_to_le16(u2_pel); | |
3783 | ||
3784 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3785 | USB_REQ_SET_SEL, | |
3786 | USB_RECIP_DEVICE, | |
3787 | 0, 0, | |
3788 | sel_values, sizeof *(sel_values), | |
3789 | USB_CTRL_SET_TIMEOUT); | |
3790 | kfree(sel_values); | |
3791 | return ret; | |
3792 | } | |
3793 | ||
3794 | /* | |
3795 | * Enable or disable device-initiated U1 or U2 transitions. | |
3796 | */ | |
3797 | static int usb_set_device_initiated_lpm(struct usb_device *udev, | |
3798 | enum usb3_link_state state, bool enable) | |
3799 | { | |
3800 | int ret; | |
3801 | int feature; | |
3802 | ||
3803 | switch (state) { | |
3804 | case USB3_LPM_U1: | |
3805 | feature = USB_DEVICE_U1_ENABLE; | |
3806 | break; | |
3807 | case USB3_LPM_U2: | |
3808 | feature = USB_DEVICE_U2_ENABLE; | |
3809 | break; | |
3810 | default: | |
3811 | dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", | |
3812 | __func__, enable ? "enable" : "disable"); | |
3813 | return -EINVAL; | |
3814 | } | |
3815 | ||
3816 | if (udev->state != USB_STATE_CONFIGURED) { | |
3817 | dev_dbg(&udev->dev, "%s: Can't %s %s state " | |
3818 | "for unconfigured device.\n", | |
3819 | __func__, enable ? "enable" : "disable", | |
3820 | usb3_lpm_names[state]); | |
3821 | return 0; | |
3822 | } | |
3823 | ||
3824 | if (enable) { | |
1ea7e0e8 SS |
3825 | /* |
3826 | * Now send the control transfer to enable device-initiated LPM | |
3827 | * for either U1 or U2. | |
3828 | */ | |
3829 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3830 | USB_REQ_SET_FEATURE, | |
3831 | USB_RECIP_DEVICE, | |
3832 | feature, | |
3833 | 0, NULL, 0, | |
3834 | USB_CTRL_SET_TIMEOUT); | |
3835 | } else { | |
3836 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3837 | USB_REQ_CLEAR_FEATURE, | |
3838 | USB_RECIP_DEVICE, | |
3839 | feature, | |
3840 | 0, NULL, 0, | |
3841 | USB_CTRL_SET_TIMEOUT); | |
3842 | } | |
3843 | if (ret < 0) { | |
3844 | dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", | |
3845 | enable ? "Enable" : "Disable", | |
3846 | usb3_lpm_names[state]); | |
3847 | return -EBUSY; | |
3848 | } | |
3849 | return 0; | |
3850 | } | |
3851 | ||
3852 | static int usb_set_lpm_timeout(struct usb_device *udev, | |
3853 | enum usb3_link_state state, int timeout) | |
3854 | { | |
3855 | int ret; | |
3856 | int feature; | |
3857 | ||
3858 | switch (state) { | |
3859 | case USB3_LPM_U1: | |
3860 | feature = USB_PORT_FEAT_U1_TIMEOUT; | |
3861 | break; | |
3862 | case USB3_LPM_U2: | |
3863 | feature = USB_PORT_FEAT_U2_TIMEOUT; | |
3864 | break; | |
3865 | default: | |
3866 | dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", | |
3867 | __func__); | |
3868 | return -EINVAL; | |
3869 | } | |
3870 | ||
3871 | if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && | |
3872 | timeout != USB3_LPM_DEVICE_INITIATED) { | |
3873 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " | |
3874 | "which is a reserved value.\n", | |
3875 | usb3_lpm_names[state], timeout); | |
3876 | return -EINVAL; | |
3877 | } | |
3878 | ||
3879 | ret = set_port_feature(udev->parent, | |
3880 | USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, | |
3881 | feature); | |
3882 | if (ret < 0) { | |
3883 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," | |
3884 | "error code %i\n", usb3_lpm_names[state], | |
3885 | timeout, ret); | |
3886 | return -EBUSY; | |
3887 | } | |
3888 | if (state == USB3_LPM_U1) | |
3889 | udev->u1_params.timeout = timeout; | |
3890 | else | |
3891 | udev->u2_params.timeout = timeout; | |
3892 | return 0; | |
3893 | } | |
3894 | ||
3895 | /* | |
3896 | * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated | |
3897 | * U1/U2 entry. | |
3898 | * | |
3899 | * We will attempt to enable U1 or U2, but there are no guarantees that the | |
3900 | * control transfers to set the hub timeout or enable device-initiated U1/U2 | |
3901 | * will be successful. | |
3902 | * | |
3903 | * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI | |
3904 | * driver know about it. If that call fails, it should be harmless, and just | |
3905 | * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. | |
3906 | */ | |
3907 | static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
3908 | enum usb3_link_state state) | |
3909 | { | |
65a95b75 | 3910 | int timeout, ret; |
ae8963ad SS |
3911 | __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; |
3912 | __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; | |
3913 | ||
3914 | /* If the device says it doesn't have *any* exit latency to come out of | |
3915 | * U1 or U2, it's probably lying. Assume it doesn't implement that link | |
3916 | * state. | |
3917 | */ | |
3918 | if ((state == USB3_LPM_U1 && u1_mel == 0) || | |
3919 | (state == USB3_LPM_U2 && u2_mel == 0)) | |
3920 | return; | |
1ea7e0e8 | 3921 | |
65a95b75 SS |
3922 | /* |
3923 | * First, let the device know about the exit latencies | |
3924 | * associated with the link state we're about to enable. | |
3925 | */ | |
3926 | ret = usb_req_set_sel(udev, state); | |
3927 | if (ret < 0) { | |
3928 | dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", | |
3929 | usb3_lpm_names[state]); | |
3930 | return; | |
3931 | } | |
3932 | ||
1ea7e0e8 SS |
3933 | /* We allow the host controller to set the U1/U2 timeout internally |
3934 | * first, so that it can change its schedule to account for the | |
3935 | * additional latency to send data to a device in a lower power | |
3936 | * link state. | |
3937 | */ | |
3938 | timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); | |
3939 | ||
3940 | /* xHCI host controller doesn't want to enable this LPM state. */ | |
3941 | if (timeout == 0) | |
3942 | return; | |
3943 | ||
3944 | if (timeout < 0) { | |
3945 | dev_warn(&udev->dev, "Could not enable %s link state, " | |
3946 | "xHCI error %i.\n", usb3_lpm_names[state], | |
3947 | timeout); | |
3948 | return; | |
3949 | } | |
3950 | ||
bf5ce5bf | 3951 | if (usb_set_lpm_timeout(udev, state, timeout)) { |
1ea7e0e8 SS |
3952 | /* If we can't set the parent hub U1/U2 timeout, |
3953 | * device-initiated LPM won't be allowed either, so let the xHCI | |
3954 | * host know that this link state won't be enabled. | |
3955 | */ | |
3956 | hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); | |
bf5ce5bf LB |
3957 | } else { |
3958 | /* Only a configured device will accept the Set Feature | |
3959 | * U1/U2_ENABLE | |
3960 | */ | |
3961 | if (udev->actconfig) | |
3962 | usb_set_device_initiated_lpm(udev, state, true); | |
3963 | ||
3964 | /* As soon as usb_set_lpm_timeout(timeout) returns 0, the | |
3965 | * hub-initiated LPM is enabled. Thus, LPM is enabled no | |
3966 | * matter the result of usb_set_device_initiated_lpm(). | |
3967 | * The only difference is whether device is able to initiate | |
3968 | * LPM. | |
3969 | */ | |
3970 | if (state == USB3_LPM_U1) | |
3971 | udev->usb3_lpm_u1_enabled = 1; | |
3972 | else if (state == USB3_LPM_U2) | |
3973 | udev->usb3_lpm_u2_enabled = 1; | |
3974 | } | |
1ea7e0e8 SS |
3975 | } |
3976 | ||
3977 | /* | |
3978 | * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated | |
3979 | * U1/U2 entry. | |
3980 | * | |
3981 | * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. | |
3982 | * If zero is returned, the parent will not allow the link to go into U1/U2. | |
3983 | * | |
3984 | * If zero is returned, device-initiated U1/U2 entry may still be enabled, but | |
3985 | * it won't have an effect on the bus link state because the parent hub will | |
3986 | * still disallow device-initiated U1/U2 entry. | |
3987 | * | |
3988 | * If zero is returned, the xHCI host controller may still think U1/U2 entry is | |
3989 | * possible. The result will be slightly more bus bandwidth will be taken up | |
3990 | * (to account for U1/U2 exit latency), but it should be harmless. | |
3991 | */ | |
3992 | static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
3993 | enum usb3_link_state state) | |
3994 | { | |
1ea7e0e8 SS |
3995 | switch (state) { |
3996 | case USB3_LPM_U1: | |
1ea7e0e8 | 3997 | case USB3_LPM_U2: |
1ea7e0e8 SS |
3998 | break; |
3999 | default: | |
4000 | dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", | |
4001 | __func__); | |
4002 | return -EINVAL; | |
4003 | } | |
4004 | ||
4005 | if (usb_set_lpm_timeout(udev, state, 0)) | |
4006 | return -EBUSY; | |
4007 | ||
4008 | usb_set_device_initiated_lpm(udev, state, false); | |
4009 | ||
4010 | if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) | |
4011 | dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " | |
4012 | "bus schedule bandwidth may be impacted.\n", | |
4013 | usb3_lpm_names[state]); | |
bf5ce5bf LB |
4014 | |
4015 | /* As soon as usb_set_lpm_timeout(0) return 0, hub initiated LPM | |
4016 | * is disabled. Hub will disallows link to enter U1/U2 as well, | |
4017 | * even device is initiating LPM. Hence LPM is disabled if hub LPM | |
4018 | * timeout set to 0, no matter device-initiated LPM is disabled or | |
4019 | * not. | |
4020 | */ | |
4021 | if (state == USB3_LPM_U1) | |
4022 | udev->usb3_lpm_u1_enabled = 0; | |
4023 | else if (state == USB3_LPM_U2) | |
4024 | udev->usb3_lpm_u2_enabled = 0; | |
4025 | ||
1ea7e0e8 SS |
4026 | return 0; |
4027 | } | |
4028 | ||
4029 | /* | |
4030 | * Disable hub-initiated and device-initiated U1 and U2 entry. | |
4031 | * Caller must own the bandwidth_mutex. | |
4032 | * | |
4033 | * This will call usb_enable_lpm() on failure, which will decrement | |
4034 | * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. | |
4035 | */ | |
4036 | int usb_disable_lpm(struct usb_device *udev) | |
4037 | { | |
4038 | struct usb_hcd *hcd; | |
4039 | ||
4040 | if (!udev || !udev->parent || | |
8a1b2725 | 4041 | udev->speed < USB_SPEED_SUPER || |
51df62ff PA |
4042 | !udev->lpm_capable || |
4043 | udev->state < USB_STATE_DEFAULT) | |
1ea7e0e8 SS |
4044 | return 0; |
4045 | ||
4046 | hcd = bus_to_hcd(udev->bus); | |
4047 | if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) | |
4048 | return 0; | |
4049 | ||
4050 | udev->lpm_disable_count++; | |
55558c33 | 4051 | if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) |
1ea7e0e8 SS |
4052 | return 0; |
4053 | ||
4054 | /* If LPM is enabled, attempt to disable it. */ | |
4055 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) | |
4056 | goto enable_lpm; | |
4057 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) | |
4058 | goto enable_lpm; | |
4059 | ||
4060 | return 0; | |
4061 | ||
4062 | enable_lpm: | |
4063 | usb_enable_lpm(udev); | |
4064 | return -EBUSY; | |
4065 | } | |
4066 | EXPORT_SYMBOL_GPL(usb_disable_lpm); | |
4067 | ||
4068 | /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ | |
4069 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
4070 | { | |
4071 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
4072 | int ret; | |
4073 | ||
4074 | if (!hcd) | |
4075 | return -EINVAL; | |
4076 | ||
4077 | mutex_lock(hcd->bandwidth_mutex); | |
4078 | ret = usb_disable_lpm(udev); | |
4079 | mutex_unlock(hcd->bandwidth_mutex); | |
4080 | ||
4081 | return ret; | |
4082 | } | |
4083 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); | |
4084 | ||
4085 | /* | |
4086 | * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The | |
4087 | * xHCI host policy may prevent U1 or U2 from being enabled. | |
4088 | * | |
4089 | * Other callers may have disabled link PM, so U1 and U2 entry will be disabled | |
4090 | * until the lpm_disable_count drops to zero. Caller must own the | |
4091 | * bandwidth_mutex. | |
4092 | */ | |
4093 | void usb_enable_lpm(struct usb_device *udev) | |
4094 | { | |
4095 | struct usb_hcd *hcd; | |
513072d9 LB |
4096 | struct usb_hub *hub; |
4097 | struct usb_port *port_dev; | |
1ea7e0e8 SS |
4098 | |
4099 | if (!udev || !udev->parent || | |
8a1b2725 | 4100 | udev->speed < USB_SPEED_SUPER || |
51df62ff PA |
4101 | !udev->lpm_capable || |
4102 | udev->state < USB_STATE_DEFAULT) | |
1ea7e0e8 SS |
4103 | return; |
4104 | ||
4105 | udev->lpm_disable_count--; | |
4106 | hcd = bus_to_hcd(udev->bus); | |
4107 | /* Double check that we can both enable and disable LPM. | |
4108 | * Device must be configured to accept set feature U1/U2 timeout. | |
4109 | */ | |
4110 | if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || | |
4111 | !hcd->driver->disable_usb3_lpm_timeout) | |
4112 | return; | |
4113 | ||
4114 | if (udev->lpm_disable_count > 0) | |
4115 | return; | |
4116 | ||
513072d9 LB |
4117 | hub = usb_hub_to_struct_hub(udev->parent); |
4118 | if (!hub) | |
4119 | return; | |
4120 | ||
4121 | port_dev = hub->ports[udev->portnum - 1]; | |
4122 | ||
4123 | if (port_dev->usb3_lpm_u1_permit) | |
4124 | usb_enable_link_state(hcd, udev, USB3_LPM_U1); | |
4125 | ||
4126 | if (port_dev->usb3_lpm_u2_permit) | |
4127 | usb_enable_link_state(hcd, udev, USB3_LPM_U2); | |
1ea7e0e8 SS |
4128 | } |
4129 | EXPORT_SYMBOL_GPL(usb_enable_lpm); | |
4130 | ||
4131 | /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ | |
4132 | void usb_unlocked_enable_lpm(struct usb_device *udev) | |
4133 | { | |
4134 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
4135 | ||
4136 | if (!hcd) | |
4137 | return; | |
4138 | ||
4139 | mutex_lock(hcd->bandwidth_mutex); | |
4140 | usb_enable_lpm(udev); | |
4141 | mutex_unlock(hcd->bandwidth_mutex); | |
4142 | } | |
4143 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); | |
4144 | ||
4145 | ||
d388dab7 AS |
4146 | #else /* CONFIG_PM */ |
4147 | ||
f07600cf AS |
4148 | #define hub_suspend NULL |
4149 | #define hub_resume NULL | |
4150 | #define hub_reset_resume NULL | |
1ea7e0e8 SS |
4151 | |
4152 | int usb_disable_lpm(struct usb_device *udev) | |
4153 | { | |
4154 | return 0; | |
4155 | } | |
e9261fb6 | 4156 | EXPORT_SYMBOL_GPL(usb_disable_lpm); |
1ea7e0e8 SS |
4157 | |
4158 | void usb_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 4159 | EXPORT_SYMBOL_GPL(usb_enable_lpm); |
1ea7e0e8 SS |
4160 | |
4161 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
4162 | { | |
4163 | return 0; | |
4164 | } | |
e9261fb6 | 4165 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); |
1ea7e0e8 SS |
4166 | |
4167 | void usb_unlocked_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 4168 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); |
f74631e3 SS |
4169 | |
4170 | int usb_disable_ltm(struct usb_device *udev) | |
4171 | { | |
4172 | return 0; | |
4173 | } | |
4174 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
4175 | ||
4176 | void usb_enable_ltm(struct usb_device *udev) { } | |
4177 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
c4b51a43 | 4178 | |
4a95b1fc SR |
4179 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, |
4180 | u16 portstatus, u16 portchange) | |
4181 | { | |
4182 | return 0; | |
4183 | } | |
4184 | ||
c4b51a43 | 4185 | #endif /* CONFIG_PM */ |
d388dab7 | 4186 | |
1da177e4 LT |
4187 | |
4188 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
4189 | * | |
4190 | * Between connect detection and reset signaling there must be a delay | |
4191 | * of 100ms at least for debounce and power-settling. The corresponding | |
4192 | * timer shall restart whenever the downstream port detects a disconnect. | |
469271f8 | 4193 | * |
1da177e4 LT |
4194 | * Apparently there are some bluetooth and irda-dongles and a number of |
4195 | * low-speed devices for which this debounce period may last over a second. | |
4196 | * Not covered by the spec - but easy to deal with. | |
4197 | * | |
4198 | * This implementation uses a 1500ms total debounce timeout; if the | |
4199 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
4200 | * every 25ms for transient disconnects. When the port status has been | |
4201 | * unchanged for 100ms it returns the port status. | |
4202 | */ | |
ad493e5e | 4203 | int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) |
1da177e4 LT |
4204 | { |
4205 | int ret; | |
1da177e4 LT |
4206 | u16 portchange, portstatus; |
4207 | unsigned connection = 0xffff; | |
d99f6b41 DW |
4208 | int total_time, stable_time = 0; |
4209 | struct usb_port *port_dev = hub->ports[port1 - 1]; | |
1da177e4 LT |
4210 | |
4211 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
4212 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
4213 | if (ret < 0) | |
4214 | return ret; | |
4215 | ||
4216 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
4217 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
ad493e5e LT |
4218 | if (!must_be_connected || |
4219 | (connection == USB_PORT_STAT_CONNECTION)) | |
4220 | stable_time += HUB_DEBOUNCE_STEP; | |
1da177e4 LT |
4221 | if (stable_time >= HUB_DEBOUNCE_STABLE) |
4222 | break; | |
4223 | } else { | |
4224 | stable_time = 0; | |
4225 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
4226 | } | |
4227 | ||
4228 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
ad493e5e | 4229 | usb_clear_port_feature(hub->hdev, port1, |
1da177e4 LT |
4230 | USB_PORT_FEAT_C_CONNECTION); |
4231 | } | |
4232 | ||
4233 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
4234 | break; | |
4235 | msleep(HUB_DEBOUNCE_STEP); | |
4236 | } | |
4237 | ||
d99f6b41 DW |
4238 | dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n", |
4239 | total_time, stable_time, portstatus); | |
1da177e4 LT |
4240 | |
4241 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
4242 | return -ETIMEDOUT; | |
4243 | return portstatus; | |
4244 | } | |
4245 | ||
fc721f51 | 4246 | void usb_ep0_reinit(struct usb_device *udev) |
1da177e4 | 4247 | { |
ddeac4e7 AS |
4248 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
4249 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); | |
2caf7fcd | 4250 | usb_enable_endpoint(udev, &udev->ep0, true); |
1da177e4 | 4251 | } |
fc721f51 | 4252 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
1da177e4 LT |
4253 | |
4254 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
4255 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
4256 | ||
4326ed0b | 4257 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
4258 | { |
4259 | int retval; | |
c6515272 | 4260 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 4261 | |
c6515272 SS |
4262 | /* |
4263 | * The host controller will choose the device address, | |
4264 | * instead of the core having chosen it earlier | |
4265 | */ | |
4266 | if (!hcd->driver->address_device && devnum <= 1) | |
1da177e4 LT |
4267 | return -EINVAL; |
4268 | if (udev->state == USB_STATE_ADDRESS) | |
4269 | return 0; | |
4270 | if (udev->state != USB_STATE_DEFAULT) | |
4271 | return -EINVAL; | |
c8d4af8e | 4272 | if (hcd->driver->address_device) |
c6515272 | 4273 | retval = hcd->driver->address_device(hcd, udev); |
c8d4af8e | 4274 | else |
c6515272 SS |
4275 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
4276 | USB_REQ_SET_ADDRESS, 0, devnum, 0, | |
4277 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1da177e4 | 4278 | if (retval == 0) { |
3b29b68b | 4279 | update_devnum(udev, devnum); |
4953d141 | 4280 | /* Device now using proper address. */ |
1da177e4 | 4281 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
fc721f51 | 4282 | usb_ep0_reinit(udev); |
1da177e4 LT |
4283 | } |
4284 | return retval; | |
4285 | } | |
4286 | ||
890dae88 MN |
4287 | /* |
4288 | * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM | |
4289 | * when they're plugged into a USB 2.0 port, but they don't work when LPM is | |
4290 | * enabled. | |
4291 | * | |
4292 | * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the | |
4293 | * device says it supports the new USB 2.0 Link PM errata by setting the BESL | |
4294 | * support bit in the BOS descriptor. | |
4295 | */ | |
4296 | static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) | |
4297 | { | |
d99f6b41 DW |
4298 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
4299 | int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; | |
890dae88 MN |
4300 | |
4301 | if (!udev->usb2_hw_lpm_capable) | |
4302 | return; | |
4303 | ||
d99f6b41 DW |
4304 | if (hub) |
4305 | connect_type = hub->ports[udev->portnum - 1]->connect_type; | |
890dae88 | 4306 | |
23c05820 | 4307 | if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || |
890dae88 MN |
4308 | connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
4309 | udev->usb2_hw_lpm_allowed = 1; | |
4310 | usb_set_usb2_hardware_lpm(udev, 1); | |
4311 | } | |
4312 | } | |
4313 | ||
48fc7dbd DW |
4314 | static int hub_enable_device(struct usb_device *udev) |
4315 | { | |
4316 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
4317 | ||
4318 | if (!hcd->driver->enable_device) | |
4319 | return 0; | |
4320 | if (udev->state == USB_STATE_ADDRESS) | |
4321 | return 0; | |
4322 | if (udev->state != USB_STATE_DEFAULT) | |
4323 | return -EINVAL; | |
4324 | ||
4325 | return hcd->driver->enable_device(hcd, udev); | |
4326 | } | |
4327 | ||
1da177e4 LT |
4328 | /* Reset device, (re)assign address, get device descriptor. |
4329 | * Device connection must be stable, no more debouncing needed. | |
4330 | * Returns device in USB_STATE_ADDRESS, except on error. | |
4331 | * | |
4332 | * If this is called for an already-existing device (as part of | |
5c79a1e3 DW |
4333 | * usb_reset_and_verify_device), the caller must own the device lock and |
4334 | * the port lock. For a newly detected device that is not accessible | |
4335 | * through any global pointers, it's not necessary to lock the device, | |
4336 | * but it is still necessary to lock the port. | |
1da177e4 LT |
4337 | */ |
4338 | static int | |
039b3307 | 4339 | hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1, |
1da177e4 LT |
4340 | int retry_counter) |
4341 | { | |
1da177e4 | 4342 | struct usb_device *hdev = hub->hdev; |
e7b77172 | 4343 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
0d5ce778 | 4344 | int retries, operations, retval, i; |
1da177e4 LT |
4345 | unsigned delay = HUB_SHORT_RESET_TIME; |
4346 | enum usb_device_speed oldspeed = udev->speed; | |
e538dfda | 4347 | const char *speed; |
4326ed0b | 4348 | int devnum = udev->devnum; |
1da177e4 LT |
4349 | |
4350 | /* root hub ports have a slightly longer reset period | |
4351 | * (from USB 2.0 spec, section 7.1.7.5) | |
4352 | */ | |
4353 | if (!hdev->parent) { | |
4354 | delay = HUB_ROOT_RESET_TIME; | |
4355 | if (port1 == hdev->bus->otg_port) | |
4356 | hdev->bus->b_hnp_enable = 0; | |
4357 | } | |
4358 | ||
4359 | /* Some low speed devices have problems with the quick delay, so */ | |
4360 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
4361 | if (oldspeed == USB_SPEED_LOW) | |
4362 | delay = HUB_LONG_RESET_TIME; | |
4363 | ||
feb26ac3 | 4364 | mutex_lock(hcd->address0_mutex); |
1da177e4 | 4365 | |
07194ab7 LT |
4366 | /* Reset the device; full speed may morph to high speed */ |
4367 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ | |
75d7cf72 | 4368 | retval = hub_port_reset(hub, port1, udev, delay, false); |
07194ab7 LT |
4369 | if (retval < 0) /* error or disconnect */ |
4370 | goto fail; | |
4371 | /* success, speed is known */ | |
4372 | ||
1da177e4 LT |
4373 | retval = -ENODEV; |
4374 | ||
8a1b2725 MN |
4375 | /* Don't allow speed changes at reset, except usb 3.0 to faster */ |
4376 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed && | |
4377 | !(oldspeed == USB_SPEED_SUPER && udev->speed > oldspeed)) { | |
1da177e4 LT |
4378 | dev_dbg(&udev->dev, "device reset changed speed!\n"); |
4379 | goto fail; | |
4380 | } | |
4381 | oldspeed = udev->speed; | |
4326ed0b | 4382 | |
1da177e4 LT |
4383 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
4384 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
4385 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
4386 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
4387 | */ |
4388 | switch (udev->speed) { | |
8a1b2725 | 4389 | case USB_SPEED_SUPER_PLUS: |
6b403b02 | 4390 | case USB_SPEED_SUPER: |
551cdbbe | 4391 | case USB_SPEED_WIRELESS: /* fixed at 512 */ |
551509d2 | 4392 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
5bb6e0ae | 4393 | break; |
1da177e4 | 4394 | case USB_SPEED_HIGH: /* fixed at 64 */ |
551509d2 | 4395 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4396 | break; |
4397 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
4398 | /* to determine the ep0 maxpacket size, try to read | |
4399 | * the device descriptor to get bMaxPacketSize0 and | |
4400 | * then correct our initial guess. | |
4401 | */ | |
551509d2 | 4402 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4403 | break; |
4404 | case USB_SPEED_LOW: /* fixed at 8 */ | |
551509d2 | 4405 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
1da177e4 LT |
4406 | break; |
4407 | default: | |
4408 | goto fail; | |
4409 | } | |
e538dfda MN |
4410 | |
4411 | if (udev->speed == USB_SPEED_WIRELESS) | |
4412 | speed = "variable speed Wireless"; | |
4413 | else | |
4414 | speed = usb_speed_string(udev->speed); | |
4415 | ||
8a1b2725 | 4416 | if (udev->speed < USB_SPEED_SUPER) |
c6515272 | 4417 | dev_info(&udev->dev, |
e538dfda MN |
4418 | "%s %s USB device number %d using %s\n", |
4419 | (udev->config) ? "reset" : "new", speed, | |
3b29b68b | 4420 | devnum, udev->bus->controller->driver->name); |
1da177e4 LT |
4421 | |
4422 | /* Set up TT records, if needed */ | |
4423 | if (hdev->tt) { | |
4424 | udev->tt = hdev->tt; | |
4425 | udev->ttport = hdev->ttport; | |
4426 | } else if (udev->speed != USB_SPEED_HIGH | |
4427 | && hdev->speed == USB_SPEED_HIGH) { | |
d199c96d AS |
4428 | if (!hub->tt.hub) { |
4429 | dev_err(&udev->dev, "parent hub has no TT\n"); | |
4430 | retval = -EINVAL; | |
4431 | goto fail; | |
4432 | } | |
1da177e4 LT |
4433 | udev->tt = &hub->tt; |
4434 | udev->ttport = port1; | |
4435 | } | |
469271f8 | 4436 | |
1da177e4 LT |
4437 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? |
4438 | * Because device hardware and firmware is sometimes buggy in | |
4439 | * this area, and this is how Linux has done it for ages. | |
4440 | * Change it cautiously. | |
4441 | * | |
48fc7dbd | 4442 | * NOTE: If use_new_scheme() is true we will start by issuing |
1da177e4 LT |
4443 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, |
4444 | * so it may help with some non-standards-compliant devices. | |
4445 | * Otherwise we start with SET_ADDRESS and then try to read the | |
4446 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
4447 | * value. | |
4448 | */ | |
0d5ce778 | 4449 | for (retries = 0; retries < GET_DESCRIPTOR_TRIES; (++retries, msleep(100))) { |
48fc7dbd DW |
4450 | bool did_new_scheme = false; |
4451 | ||
4452 | if (use_new_scheme(udev, retry_counter)) { | |
1da177e4 LT |
4453 | struct usb_device_descriptor *buf; |
4454 | int r = 0; | |
4455 | ||
48fc7dbd DW |
4456 | did_new_scheme = true; |
4457 | retval = hub_enable_device(udev); | |
938569eb ON |
4458 | if (retval < 0) { |
4459 | dev_err(&udev->dev, | |
4460 | "hub failed to enable device, error %d\n", | |
4461 | retval); | |
48fc7dbd | 4462 | goto fail; |
938569eb | 4463 | } |
48fc7dbd | 4464 | |
1da177e4 LT |
4465 | #define GET_DESCRIPTOR_BUFSIZE 64 |
4466 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
4467 | if (!buf) { | |
4468 | retval = -ENOMEM; | |
4469 | continue; | |
4470 | } | |
4471 | ||
b89ee19a AS |
4472 | /* Retry on all errors; some devices are flakey. |
4473 | * 255 is for WUSB devices, we actually need to use | |
4474 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 | 4475 | */ |
0d5ce778 | 4476 | for (operations = 0; operations < 3; ++operations) { |
1da177e4 LT |
4477 | buf->bMaxPacketSize0 = 0; |
4478 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
4479 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
4480 | USB_DT_DEVICE << 8, 0, | |
4481 | buf, GET_DESCRIPTOR_BUFSIZE, | |
fd7c519d | 4482 | initial_descriptor_timeout); |
1da177e4 | 4483 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 4484 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
4485 | if (buf->bDescriptorType == |
4486 | USB_DT_DEVICE) { | |
4487 | r = 0; | |
4488 | break; | |
4489 | } | |
4490 | /* FALL THROUGH */ | |
4491 | default: | |
4492 | if (r == 0) | |
4493 | r = -EPROTO; | |
4494 | break; | |
4495 | } | |
264904cc ON |
4496 | /* |
4497 | * Some devices time out if they are powered on | |
4498 | * when already connected. They need a second | |
4499 | * reset. But only on the first attempt, | |
4500 | * lest we get into a time out/reset loop | |
4501 | */ | |
0d5ce778 | 4502 | if (r == 0 || (r == -ETIMEDOUT && retries == 0)) |
1da177e4 LT |
4503 | break; |
4504 | } | |
4505 | udev->descriptor.bMaxPacketSize0 = | |
4506 | buf->bMaxPacketSize0; | |
4507 | kfree(buf); | |
4508 | ||
75d7cf72 | 4509 | retval = hub_port_reset(hub, port1, udev, delay, false); |
1da177e4 LT |
4510 | if (retval < 0) /* error or disconnect */ |
4511 | goto fail; | |
4512 | if (oldspeed != udev->speed) { | |
4513 | dev_dbg(&udev->dev, | |
4514 | "device reset changed speed!\n"); | |
4515 | retval = -ENODEV; | |
4516 | goto fail; | |
4517 | } | |
4518 | if (r) { | |
e9e88fb7 AS |
4519 | if (r != -ENODEV) |
4520 | dev_err(&udev->dev, "device descriptor read/64, error %d\n", | |
4521 | r); | |
1da177e4 LT |
4522 | retval = -EMSGSIZE; |
4523 | continue; | |
4524 | } | |
4525 | #undef GET_DESCRIPTOR_BUFSIZE | |
4526 | } | |
4527 | ||
469271f8 MB |
4528 | /* |
4529 | * If device is WUSB, we already assigned an | |
4530 | * unauthorized address in the Connect Ack sequence; | |
4531 | * authorization will assign the final address. | |
4532 | */ | |
c6515272 | 4533 | if (udev->wusb == 0) { |
0d5ce778 | 4534 | for (operations = 0; operations < SET_ADDRESS_TRIES; ++operations) { |
6c529cdc IPG |
4535 | retval = hub_set_address(udev, devnum); |
4536 | if (retval >= 0) | |
4537 | break; | |
4538 | msleep(200); | |
4539 | } | |
4540 | if (retval < 0) { | |
e9e88fb7 AS |
4541 | if (retval != -ENODEV) |
4542 | dev_err(&udev->dev, "device not accepting address %d, error %d\n", | |
4543 | devnum, retval); | |
6c529cdc IPG |
4544 | goto fail; |
4545 | } | |
8a1b2725 | 4546 | if (udev->speed >= USB_SPEED_SUPER) { |
c6515272 SS |
4547 | devnum = udev->devnum; |
4548 | dev_info(&udev->dev, | |
8a1b2725 | 4549 | "%s SuperSpeed%s USB device number %d using %s\n", |
c6515272 | 4550 | (udev->config) ? "reset" : "new", |
8a1b2725 | 4551 | (udev->speed == USB_SPEED_SUPER_PLUS) ? "Plus" : "", |
3b29b68b | 4552 | devnum, udev->bus->controller->driver->name); |
c6515272 | 4553 | } |
6c529cdc IPG |
4554 | |
4555 | /* cope with hardware quirkiness: | |
4556 | * - let SET_ADDRESS settle, some device hardware wants it | |
4557 | * - read ep0 maxpacket even for high and low speed, | |
4558 | */ | |
4559 | msleep(10); | |
48fc7dbd DW |
4560 | /* use_new_scheme() checks the speed which may have |
4561 | * changed since the initial look so we cache the result | |
4562 | * in did_new_scheme | |
4563 | */ | |
4564 | if (did_new_scheme) | |
1da177e4 | 4565 | break; |
469271f8 | 4566 | } |
1da177e4 LT |
4567 | |
4568 | retval = usb_get_device_descriptor(udev, 8); | |
4569 | if (retval < 8) { | |
e9e88fb7 AS |
4570 | if (retval != -ENODEV) |
4571 | dev_err(&udev->dev, | |
b9cef6c3 WF |
4572 | "device descriptor read/8, error %d\n", |
4573 | retval); | |
1da177e4 LT |
4574 | if (retval >= 0) |
4575 | retval = -EMSGSIZE; | |
4576 | } else { | |
4577 | retval = 0; | |
4578 | break; | |
4579 | } | |
4580 | } | |
4581 | if (retval) | |
4582 | goto fail; | |
4583 | ||
d8aec3db EF |
4584 | /* |
4585 | * Some superspeed devices have finished the link training process | |
4586 | * and attached to a superspeed hub port, but the device descriptor | |
4587 | * got from those devices show they aren't superspeed devices. Warm | |
4588 | * reset the port attached by the devices can fix them. | |
4589 | */ | |
8a1b2725 | 4590 | if ((udev->speed >= USB_SPEED_SUPER) && |
d8aec3db EF |
4591 | (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { |
4592 | dev_err(&udev->dev, "got a wrong device descriptor, " | |
4593 | "warm reset device\n"); | |
4594 | hub_port_reset(hub, port1, udev, | |
4595 | HUB_BH_RESET_TIME, true); | |
4596 | retval = -EINVAL; | |
4597 | goto fail; | |
4598 | } | |
4599 | ||
6b403b02 | 4600 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
8a1b2725 | 4601 | udev->speed >= USB_SPEED_SUPER) |
6b403b02 SS |
4602 | i = 512; |
4603 | else | |
4604 | i = udev->descriptor.bMaxPacketSize0; | |
29cc8897 | 4605 | if (usb_endpoint_maxp(&udev->ep0.desc) != i) { |
56626a72 | 4606 | if (udev->speed == USB_SPEED_LOW || |
1da177e4 | 4607 | !(i == 8 || i == 16 || i == 32 || i == 64)) { |
56626a72 | 4608 | dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); |
1da177e4 LT |
4609 | retval = -EMSGSIZE; |
4610 | goto fail; | |
4611 | } | |
56626a72 AS |
4612 | if (udev->speed == USB_SPEED_FULL) |
4613 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
4614 | else | |
4615 | dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); | |
1da177e4 | 4616 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
fc721f51 | 4617 | usb_ep0_reinit(udev); |
1da177e4 | 4618 | } |
469271f8 | 4619 | |
1da177e4 LT |
4620 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); |
4621 | if (retval < (signed)sizeof(udev->descriptor)) { | |
e9e88fb7 AS |
4622 | if (retval != -ENODEV) |
4623 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", | |
4624 | retval); | |
1da177e4 LT |
4625 | if (retval >= 0) |
4626 | retval = -ENOMSG; | |
4627 | goto fail; | |
4628 | } | |
4629 | ||
ad87e032 AS |
4630 | usb_detect_quirks(udev); |
4631 | ||
1ff4df56 AX |
4632 | if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { |
4633 | retval = usb_get_bos_descriptor(udev); | |
51e0a012 | 4634 | if (!retval) { |
d9b2099c | 4635 | udev->lpm_capable = usb_device_supports_lpm(udev); |
51e0a012 SS |
4636 | usb_set_lpm_parameters(udev); |
4637 | } | |
1ff4df56 | 4638 | } |
3148bf04 | 4639 | |
1da177e4 | 4640 | retval = 0; |
48f24970 AD |
4641 | /* notify HCD that we have a device connected and addressed */ |
4642 | if (hcd->driver->update_device) | |
4643 | hcd->driver->update_device(hcd, udev); | |
890dae88 | 4644 | hub_set_initial_usb2_lpm_policy(udev); |
1da177e4 | 4645 | fail: |
4326ed0b | 4646 | if (retval) { |
1da177e4 | 4647 | hub_port_disable(hub, port1, 0); |
3b29b68b | 4648 | update_devnum(udev, devnum); /* for disconnect processing */ |
4326ed0b | 4649 | } |
feb26ac3 | 4650 | mutex_unlock(hcd->address0_mutex); |
1da177e4 LT |
4651 | return retval; |
4652 | } | |
4653 | ||
4654 | static void | |
039b3307 | 4655 | check_highspeed(struct usb_hub *hub, struct usb_device *udev, int port1) |
1da177e4 LT |
4656 | { |
4657 | struct usb_qualifier_descriptor *qual; | |
4658 | int status; | |
4659 | ||
2a159389 JH |
4660 | if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER) |
4661 | return; | |
4662 | ||
039b3307 | 4663 | qual = kmalloc(sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
4664 | if (qual == NULL) |
4665 | return; | |
4666 | ||
039b3307 | 4667 | status = usb_get_descriptor(udev, USB_DT_DEVICE_QUALIFIER, 0, |
1da177e4 LT |
4668 | qual, sizeof *qual); |
4669 | if (status == sizeof *qual) { | |
4670 | dev_info(&udev->dev, "not running at top speed; " | |
4671 | "connect to a high speed hub\n"); | |
4672 | /* hub LEDs are probably harder to miss than syslog */ | |
4673 | if (hub->has_indicators) { | |
4674 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
22f6a0f0 SD |
4675 | queue_delayed_work(system_power_efficient_wq, |
4676 | &hub->leds, 0); | |
1da177e4 LT |
4677 | } |
4678 | } | |
1bc3c9e1 | 4679 | kfree(qual); |
1da177e4 LT |
4680 | } |
4681 | ||
4682 | static unsigned | |
039b3307 | 4683 | hub_power_remaining(struct usb_hub *hub) |
1da177e4 LT |
4684 | { |
4685 | struct usb_device *hdev = hub->hdev; | |
4686 | int remaining; | |
55c52718 | 4687 | int port1; |
1da177e4 | 4688 | |
55c52718 | 4689 | if (!hub->limited_power) |
1da177e4 LT |
4690 | return 0; |
4691 | ||
55c52718 AS |
4692 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
4693 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
d99f6b41 DW |
4694 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
4695 | struct usb_device *udev = port_dev->child; | |
4696 | unsigned unit_load; | |
4697 | int delta; | |
1da177e4 LT |
4698 | |
4699 | if (!udev) | |
4700 | continue; | |
430ee58e SAS |
4701 | if (hub_is_superspeed(udev)) |
4702 | unit_load = 150; | |
4703 | else | |
4704 | unit_load = 100; | |
1da177e4 | 4705 | |
430ee58e SAS |
4706 | /* |
4707 | * Unconfigured devices may not use more than one unit load, | |
4708 | * or 8mA for OTG ports | |
4709 | */ | |
1da177e4 | 4710 | if (udev->actconfig) |
8d8479db | 4711 | delta = usb_get_max_power(udev, udev->actconfig); |
55c52718 | 4712 | else if (port1 != udev->bus->otg_port || hdev->parent) |
430ee58e | 4713 | delta = unit_load; |
1da177e4 | 4714 | else |
55c52718 AS |
4715 | delta = 8; |
4716 | if (delta > hub->mA_per_port) | |
d99f6b41 DW |
4717 | dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n", |
4718 | delta, hub->mA_per_port); | |
1da177e4 LT |
4719 | remaining -= delta; |
4720 | } | |
4721 | if (remaining < 0) { | |
55c52718 | 4722 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
469271f8 | 4723 | -remaining); |
1da177e4 LT |
4724 | remaining = 0; |
4725 | } | |
4726 | return remaining; | |
4727 | } | |
4728 | ||
af376a46 DW |
4729 | static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, |
4730 | u16 portchange) | |
1da177e4 | 4731 | { |
1da177e4 | 4732 | int status, i; |
430ee58e | 4733 | unsigned unit_load; |
1da177e4 | 4734 | struct usb_device *hdev = hub->hdev; |
90da096e | 4735 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
d99f6b41 | 4736 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
af376a46 | 4737 | struct usb_device *udev = port_dev->child; |
5ee0f803 | 4738 | static int unreliable_port = -1; |
8808f00c | 4739 | |
24618b0c | 4740 | /* Disconnect any existing devices under this port */ |
b76baa81 | 4741 | if (udev) { |
b2108f1e | 4742 | if (hcd->usb_phy && !hdev->parent) |
3d46e73d | 4743 | usb_phy_notify_disconnect(hcd->usb_phy, udev->speed); |
d99f6b41 | 4744 | usb_disconnect(&port_dev->child); |
b76baa81 | 4745 | } |
24618b0c | 4746 | |
253e0572 AS |
4747 | /* We can forget about a "removed" device when there's a physical |
4748 | * disconnect or the connect status changes. | |
4749 | */ | |
4750 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4751 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
4752 | clear_bit(port1, hub->removed_bits); | |
4753 | ||
5257d97a AS |
4754 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
4755 | USB_PORT_STAT_C_ENABLE)) { | |
ad493e5e | 4756 | status = hub_port_debounce_be_stable(hub, port1); |
5257d97a | 4757 | if (status < 0) { |
5ee0f803 ON |
4758 | if (status != -ENODEV && |
4759 | port1 != unreliable_port && | |
4760 | printk_ratelimit()) | |
dd5f5006 | 4761 | dev_err(&port_dev->dev, "connect-debounce failed\n"); |
5257d97a | 4762 | portstatus &= ~USB_PORT_STAT_CONNECTION; |
5ee0f803 | 4763 | unreliable_port = port1; |
5257d97a AS |
4764 | } else { |
4765 | portstatus = status; | |
4766 | } | |
4767 | } | |
4768 | ||
253e0572 AS |
4769 | /* Return now if debouncing failed or nothing is connected or |
4770 | * the device was "removed". | |
4771 | */ | |
4772 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4773 | test_bit(port1, hub->removed_bits)) { | |
1da177e4 | 4774 | |
fbaecff0 DD |
4775 | /* |
4776 | * maybe switch power back on (e.g. root hub was reset) | |
4777 | * but only if the port isn't owned by someone else. | |
4778 | */ | |
9262c19d | 4779 | if (hub_is_port_power_switchable(hub) |
fbaecff0 DD |
4780 | && !port_is_power_on(hub, portstatus) |
4781 | && !port_dev->port_owner) | |
1da177e4 | 4782 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
5257d97a | 4783 | |
1da177e4 | 4784 | if (portstatus & USB_PORT_STAT_ENABLE) |
469271f8 | 4785 | goto done; |
1da177e4 LT |
4786 | return; |
4787 | } | |
430ee58e SAS |
4788 | if (hub_is_superspeed(hub->hdev)) |
4789 | unit_load = 150; | |
4790 | else | |
4791 | unit_load = 100; | |
1da177e4 | 4792 | |
e9e88fb7 | 4793 | status = 0; |
1da177e4 | 4794 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
1da177e4 LT |
4795 | |
4796 | /* reallocate for each attempt, since references | |
4797 | * to the previous one can escape in various ways | |
4798 | */ | |
4799 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
4800 | if (!udev) { | |
d99f6b41 DW |
4801 | dev_err(&port_dev->dev, |
4802 | "couldn't allocate usb_device\n"); | |
1da177e4 LT |
4803 | goto done; |
4804 | } | |
4805 | ||
4806 | usb_set_device_state(udev, USB_STATE_POWERED); | |
469271f8 | 4807 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 4808 | udev->level = hdev->level + 1; |
8af548dc | 4809 | udev->wusb = hub_is_wusb(hub); |
55c52718 | 4810 | |
8a1b2725 | 4811 | /* Devices connected to SuperSpeed hubs are USB 3.0 or later */ |
131dec34 | 4812 | if (hub_is_superspeed(hub->hdev)) |
e7b77172 SS |
4813 | udev->speed = USB_SPEED_SUPER; |
4814 | else | |
4815 | udev->speed = USB_SPEED_UNKNOWN; | |
4816 | ||
3b29b68b | 4817 | choose_devnum(udev); |
c8d4af8e AX |
4818 | if (udev->devnum <= 0) { |
4819 | status = -ENOTCONN; /* Don't retry */ | |
4820 | goto loop; | |
c6515272 SS |
4821 | } |
4822 | ||
e7b77172 | 4823 | /* reset (non-USB 3.0 devices) and get descriptor */ |
5c79a1e3 | 4824 | usb_lock_port(port_dev); |
1da177e4 | 4825 | status = hub_port_init(hub, udev, port1, i); |
5c79a1e3 | 4826 | usb_unlock_port(port_dev); |
1da177e4 LT |
4827 | if (status < 0) |
4828 | goto loop; | |
4829 | ||
93362a87 PD |
4830 | if (udev->quirks & USB_QUIRK_DELAY_INIT) |
4831 | msleep(1000); | |
4832 | ||
1da177e4 LT |
4833 | /* consecutive bus-powered hubs aren't reliable; they can |
4834 | * violate the voltage drop budget. if the new child has | |
4835 | * a "powered" LED, users should notice we didn't enable it | |
4836 | * (without reading syslog), even without per-port LEDs | |
4837 | * on the parent. | |
4838 | */ | |
4839 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
430ee58e | 4840 | && udev->bus_mA <= unit_load) { |
1da177e4 LT |
4841 | u16 devstat; |
4842 | ||
4843 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
4844 | &devstat); | |
15b7336e | 4845 | if (status) { |
1da177e4 LT |
4846 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
4847 | goto loop_disable; | |
4848 | } | |
1da177e4 LT |
4849 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
4850 | dev_err(&udev->dev, | |
4851 | "can't connect bus-powered hub " | |
4852 | "to this port\n"); | |
4853 | if (hub->has_indicators) { | |
4854 | hub->indicator[port1-1] = | |
4855 | INDICATOR_AMBER_BLINK; | |
22f6a0f0 SD |
4856 | queue_delayed_work( |
4857 | system_power_efficient_wq, | |
4858 | &hub->leds, 0); | |
1da177e4 LT |
4859 | } |
4860 | status = -ENOTCONN; /* Don't retry */ | |
4861 | goto loop_disable; | |
4862 | } | |
4863 | } | |
469271f8 | 4864 | |
1da177e4 LT |
4865 | /* check for devices running slower than they could */ |
4866 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
4867 | && udev->speed == USB_SPEED_FULL | |
4868 | && highspeed_hubs != 0) | |
039b3307 | 4869 | check_highspeed(hub, udev, port1); |
1da177e4 | 4870 | |
fa286188 | 4871 | /* Store the parent's children[] pointer. At this point |
1da177e4 LT |
4872 | * udev becomes globally accessible, although presumably |
4873 | * no one will look at it until hdev is unlocked. | |
4874 | */ | |
1da177e4 LT |
4875 | status = 0; |
4876 | ||
d8521afe DW |
4877 | mutex_lock(&usb_port_peer_mutex); |
4878 | ||
1da177e4 LT |
4879 | /* We mustn't add new devices if the parent hub has |
4880 | * been disconnected; we would race with the | |
4881 | * recursively_mark_NOTATTACHED() routine. | |
4882 | */ | |
4883 | spin_lock_irq(&device_state_lock); | |
4884 | if (hdev->state == USB_STATE_NOTATTACHED) | |
4885 | status = -ENOTCONN; | |
4886 | else | |
d99f6b41 | 4887 | port_dev->child = udev; |
1da177e4 | 4888 | spin_unlock_irq(&device_state_lock); |
d8521afe | 4889 | mutex_unlock(&usb_port_peer_mutex); |
1da177e4 LT |
4890 | |
4891 | /* Run it through the hoops (find a driver, etc) */ | |
4892 | if (!status) { | |
4893 | status = usb_new_device(udev); | |
4894 | if (status) { | |
d8521afe | 4895 | mutex_lock(&usb_port_peer_mutex); |
1da177e4 | 4896 | spin_lock_irq(&device_state_lock); |
d99f6b41 | 4897 | port_dev->child = NULL; |
1da177e4 | 4898 | spin_unlock_irq(&device_state_lock); |
d8521afe | 4899 | mutex_unlock(&usb_port_peer_mutex); |
01ed67dc TZ |
4900 | } else { |
4901 | if (hcd->usb_phy && !hdev->parent) | |
4902 | usb_phy_notify_connect(hcd->usb_phy, | |
4903 | udev->speed); | |
1da177e4 LT |
4904 | } |
4905 | } | |
4906 | ||
1da177e4 LT |
4907 | if (status) |
4908 | goto loop_disable; | |
4909 | ||
4910 | status = hub_power_remaining(hub); | |
4911 | if (status) | |
d99f6b41 | 4912 | dev_dbg(hub->intfdev, "%dmA power budget left\n", status); |
1da177e4 LT |
4913 | |
4914 | return; | |
4915 | ||
4916 | loop_disable: | |
4917 | hub_port_disable(hub, port1, 1); | |
4918 | loop: | |
fc721f51 | 4919 | usb_ep0_reinit(udev); |
3b29b68b | 4920 | release_devnum(udev); |
f7410ced | 4921 | hub_free_dev(udev); |
1da177e4 | 4922 | usb_put_dev(udev); |
ffcdc18d | 4923 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 LT |
4924 | break; |
4925 | } | |
3a31155c AS |
4926 | if (hub->hdev->parent || |
4927 | !hcd->driver->port_handed_over || | |
e9e88fb7 AS |
4928 | !(hcd->driver->port_handed_over)(hcd, port1)) { |
4929 | if (status != -ENOTCONN && status != -ENODEV) | |
d99f6b41 DW |
4930 | dev_err(&port_dev->dev, |
4931 | "unable to enumerate USB device\n"); | |
e9e88fb7 | 4932 | } |
469271f8 | 4933 | |
1da177e4 LT |
4934 | done: |
4935 | hub_port_disable(hub, port1, 1); | |
90da096e BR |
4936 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
4937 | hcd->driver->relinquish_port(hcd, port1); | |
af376a46 | 4938 | |
1da177e4 LT |
4939 | } |
4940 | ||
af376a46 DW |
4941 | /* Handle physical or logical connection change events. |
4942 | * This routine is called when: | |
4943 | * a port connection-change occurs; | |
4944 | * a port enable-change occurs (often caused by EMI); | |
4945 | * usb_reset_and_verify_device() encounters changed descriptors (as from | |
4946 | * a firmware download) | |
4947 | * caller already locked the hub | |
4948 | */ | |
4949 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
4950 | u16 portstatus, u16 portchange) | |
5c79a1e3 | 4951 | __must_hold(&port_dev->status_lock) |
714b07be | 4952 | { |
af376a46 DW |
4953 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
4954 | struct usb_device *udev = port_dev->child; | |
4955 | int status = -ENODEV; | |
714b07be | 4956 | |
af376a46 DW |
4957 | dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus, |
4958 | portchange, portspeed(hub, portstatus)); | |
4959 | ||
4960 | if (hub->has_indicators) { | |
4961 | set_port_led(hub, port1, HUB_LED_AUTO); | |
4962 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
4ee823b8 SS |
4963 | } |
4964 | ||
af376a46 DW |
4965 | #ifdef CONFIG_USB_OTG |
4966 | /* during HNP, don't repeat the debounce */ | |
4967 | if (hub->hdev->bus->is_b_host) | |
4968 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | | |
4969 | USB_PORT_STAT_C_ENABLE); | |
4970 | #endif | |
4971 | ||
4972 | /* Try to resuscitate an existing device */ | |
4973 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && | |
4974 | udev->state != USB_STATE_NOTATTACHED) { | |
4975 | if (portstatus & USB_PORT_STAT_ENABLE) { | |
4976 | status = 0; /* Nothing to do */ | |
ceb6c9c8 | 4977 | #ifdef CONFIG_PM |
af376a46 DW |
4978 | } else if (udev->state == USB_STATE_SUSPENDED && |
4979 | udev->persist_enabled) { | |
4980 | /* For a suspended device, treat this as a | |
4981 | * remote wakeup event. | |
4982 | */ | |
5c79a1e3 | 4983 | usb_unlock_port(port_dev); |
af376a46 | 4984 | status = usb_remote_wakeup(udev); |
5c79a1e3 | 4985 | usb_lock_port(port_dev); |
af376a46 DW |
4986 | #endif |
4987 | } else { | |
4988 | /* Don't resuscitate */; | |
4989 | } | |
af376a46 DW |
4990 | } |
4991 | clear_bit(port1, hub->change_bits); | |
4992 | ||
5c79a1e3 | 4993 | /* successfully revalidated the connection */ |
af376a46 DW |
4994 | if (status == 0) |
4995 | return; | |
4996 | ||
5c79a1e3 | 4997 | usb_unlock_port(port_dev); |
af376a46 | 4998 | hub_port_connect(hub, port1, portstatus, portchange); |
5c79a1e3 | 4999 | usb_lock_port(port_dev); |
1da177e4 LT |
5000 | } |
5001 | ||
af376a46 | 5002 | static void port_event(struct usb_hub *hub, int port1) |
5c79a1e3 | 5003 | __must_hold(&port_dev->status_lock) |
af376a46 | 5004 | { |
7671bd1e | 5005 | int connect_change; |
af376a46 DW |
5006 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
5007 | struct usb_device *udev = port_dev->child; | |
5008 | struct usb_device *hdev = hub->hdev; | |
5009 | u16 portstatus, portchange; | |
5010 | ||
5011 | connect_change = test_bit(port1, hub->change_bits); | |
5012 | clear_bit(port1, hub->event_bits); | |
5013 | clear_bit(port1, hub->wakeup_bits); | |
5014 | ||
5015 | if (hub_port_status(hub, port1, &portstatus, &portchange) < 0) | |
5016 | return; | |
5017 | ||
5018 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
5019 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); | |
5020 | connect_change = 1; | |
5021 | } | |
5022 | ||
5023 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
5024 | if (!connect_change) | |
5025 | dev_dbg(&port_dev->dev, "enable change, status %08x\n", | |
5026 | portstatus); | |
5027 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); | |
5028 | ||
5029 | /* | |
5030 | * EM interference sometimes causes badly shielded USB devices | |
5031 | * to be shutdown by the hub, this hack enables them again. | |
5032 | * Works at least with mouse driver. | |
5033 | */ | |
5034 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
5035 | && !connect_change && udev) { | |
5036 | dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n"); | |
5037 | connect_change = 1; | |
5038 | } | |
5039 | } | |
5040 | ||
5041 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
5042 | u16 status = 0, unused; | |
5043 | ||
5044 | dev_dbg(&port_dev->dev, "over-current change\n"); | |
5045 | usb_clear_port_feature(hdev, port1, | |
5046 | USB_PORT_FEAT_C_OVER_CURRENT); | |
5047 | msleep(100); /* Cool down */ | |
5048 | hub_power_on(hub, true); | |
5049 | hub_port_status(hub, port1, &status, &unused); | |
5050 | if (status & USB_PORT_STAT_OVERCURRENT) | |
5051 | dev_err(&port_dev->dev, "over-current condition\n"); | |
5052 | } | |
5053 | ||
5054 | if (portchange & USB_PORT_STAT_C_RESET) { | |
5055 | dev_dbg(&port_dev->dev, "reset change\n"); | |
5056 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET); | |
5057 | } | |
5058 | if ((portchange & USB_PORT_STAT_C_BH_RESET) | |
5059 | && hub_is_superspeed(hdev)) { | |
5060 | dev_dbg(&port_dev->dev, "warm reset change\n"); | |
5061 | usb_clear_port_feature(hdev, port1, | |
5062 | USB_PORT_FEAT_C_BH_PORT_RESET); | |
5063 | } | |
5064 | if (portchange & USB_PORT_STAT_C_LINK_STATE) { | |
5065 | dev_dbg(&port_dev->dev, "link state change\n"); | |
5066 | usb_clear_port_feature(hdev, port1, | |
5067 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
5068 | } | |
5069 | if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { | |
5070 | dev_warn(&port_dev->dev, "config error\n"); | |
5071 | usb_clear_port_feature(hdev, port1, | |
5072 | USB_PORT_FEAT_C_PORT_CONFIG_ERROR); | |
5073 | } | |
5074 | ||
097a155f DW |
5075 | /* skip port actions that require the port to be powered on */ |
5076 | if (!pm_runtime_active(&port_dev->dev)) | |
5077 | return; | |
714b07be | 5078 | |
af376a46 DW |
5079 | if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange)) |
5080 | connect_change = 1; | |
5081 | ||
5082 | /* | |
5083 | * Warm reset a USB3 protocol port if it's in | |
5084 | * SS.Inactive state. | |
5085 | */ | |
3cd12f91 | 5086 | if (hub_port_warm_reset_required(hub, port1, portstatus)) { |
af376a46 DW |
5087 | dev_dbg(&port_dev->dev, "do warm reset\n"); |
5088 | if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION) | |
5089 | || udev->state == USB_STATE_NOTATTACHED) { | |
5090 | if (hub_port_reset(hub, port1, NULL, | |
5091 | HUB_BH_RESET_TIME, true) < 0) | |
5092 | hub_port_disable(hub, port1, 1); | |
7671bd1e ZJC |
5093 | } else { |
5094 | usb_unlock_port(port_dev); | |
5095 | usb_lock_device(udev); | |
5096 | usb_reset_device(udev); | |
5097 | usb_unlock_device(udev); | |
5098 | usb_lock_port(port_dev); | |
5099 | connect_change = 0; | |
5100 | } | |
714b07be | 5101 | } |
af376a46 DW |
5102 | |
5103 | if (connect_change) | |
5104 | hub_port_connect_change(hub, port1, portstatus, portchange); | |
714b07be SS |
5105 | } |
5106 | ||
32a69589 | 5107 | static void hub_event(struct work_struct *work) |
1da177e4 | 5108 | { |
1da177e4 LT |
5109 | struct usb_device *hdev; |
5110 | struct usb_interface *intf; | |
5111 | struct usb_hub *hub; | |
5112 | struct device *hub_dev; | |
5113 | u16 hubstatus; | |
5114 | u16 hubchange; | |
1da177e4 | 5115 | int i, ret; |
1da177e4 | 5116 | |
32a69589 | 5117 | hub = container_of(work, struct usb_hub, events); |
eb6e2924 PM |
5118 | hdev = hub->hdev; |
5119 | hub_dev = hub->intfdev; | |
5120 | intf = to_usb_interface(hub_dev); | |
32a69589 | 5121 | |
eb6e2924 PM |
5122 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
5123 | hdev->state, hdev->maxchild, | |
5124 | /* NOTE: expects max 15 ports... */ | |
5125 | (u16) hub->change_bits[0], | |
5126 | (u16) hub->event_bits[0]); | |
5127 | ||
5128 | /* Lock the device, then check to see if we were | |
5129 | * disconnected while waiting for the lock to succeed. */ | |
5130 | usb_lock_device(hdev); | |
5131 | if (unlikely(hub->disconnected)) | |
32a69589 | 5132 | goto out_hdev_lock; |
eb6e2924 PM |
5133 | |
5134 | /* If the hub has died, clean up after it */ | |
5135 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
5136 | hub->error = -ENODEV; | |
5137 | hub_quiesce(hub, HUB_DISCONNECT); | |
32a69589 | 5138 | goto out_hdev_lock; |
eb6e2924 PM |
5139 | } |
5140 | ||
5141 | /* Autoresume */ | |
5142 | ret = usb_autopm_get_interface(intf); | |
5143 | if (ret) { | |
5144 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
32a69589 | 5145 | goto out_hdev_lock; |
eb6e2924 | 5146 | } |
1da177e4 | 5147 | |
eb6e2924 PM |
5148 | /* If this is an inactive hub, do nothing */ |
5149 | if (hub->quiescing) | |
5150 | goto out_autopm; | |
1da177e4 | 5151 | |
eb6e2924 PM |
5152 | if (hub->error) { |
5153 | dev_dbg(hub_dev, "resetting for error %d\n", hub->error); | |
5154 | ||
5155 | ret = usb_reset_device(hdev); | |
40f122f3 | 5156 | if (ret) { |
eb6e2924 PM |
5157 | dev_dbg(hub_dev, "error resetting hub: %d\n", ret); |
5158 | goto out_autopm; | |
40f122f3 | 5159 | } |
a8e7c565 | 5160 | |
eb6e2924 PM |
5161 | hub->nerrors = 0; |
5162 | hub->error = 0; | |
5163 | } | |
1da177e4 | 5164 | |
eb6e2924 PM |
5165 | /* deal with port status changes */ |
5166 | for (i = 1; i <= hdev->maxchild; i++) { | |
5167 | struct usb_port *port_dev = hub->ports[i - 1]; | |
1da177e4 | 5168 | |
eb6e2924 PM |
5169 | if (test_bit(i, hub->event_bits) |
5170 | || test_bit(i, hub->change_bits) | |
5171 | || test_bit(i, hub->wakeup_bits)) { | |
5172 | /* | |
5173 | * The get_noresume and barrier ensure that if | |
5174 | * the port was in the process of resuming, we | |
5175 | * flush that work and keep the port active for | |
5176 | * the duration of the port_event(). However, | |
5177 | * if the port is runtime pm suspended | |
5178 | * (powered-off), we leave it in that state, run | |
5179 | * an abbreviated port_event(), and move on. | |
5180 | */ | |
5181 | pm_runtime_get_noresume(&port_dev->dev); | |
5182 | pm_runtime_barrier(&port_dev->dev); | |
5183 | usb_lock_port(port_dev); | |
5184 | port_event(hub, i); | |
5185 | usb_unlock_port(port_dev); | |
5186 | pm_runtime_put_sync(&port_dev->dev); | |
1da177e4 | 5187 | } |
eb6e2924 | 5188 | } |
1da177e4 | 5189 | |
eb6e2924 PM |
5190 | /* deal with hub status changes */ |
5191 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
5192 | ; /* do nothing */ | |
5193 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
5194 | dev_err(hub_dev, "get_hub_status failed\n"); | |
5195 | else { | |
5196 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
5197 | dev_dbg(hub_dev, "power change\n"); | |
5198 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
5199 | if (hubstatus & HUB_STATUS_LOCAL_POWER) | |
5200 | /* FIXME: Is this always true? */ | |
5201 | hub->limited_power = 1; | |
5202 | else | |
5203 | hub->limited_power = 0; | |
af376a46 | 5204 | } |
eb6e2924 PM |
5205 | if (hubchange & HUB_CHANGE_OVERCURRENT) { |
5206 | u16 status = 0; | |
5207 | u16 unused; | |
1da177e4 | 5208 | |
eb6e2924 PM |
5209 | dev_dbg(hub_dev, "over-current change\n"); |
5210 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); | |
5211 | msleep(500); /* Cool down */ | |
5212 | hub_power_on(hub, true); | |
5213 | hub_hub_status(hub, &status, &unused); | |
5214 | if (status & HUB_STATUS_OVERCURRENT) | |
5215 | dev_err(hub_dev, "over-current condition\n"); | |
1da177e4 | 5216 | } |
eb6e2924 | 5217 | } |
1da177e4 | 5218 | |
eb6e2924 PM |
5219 | out_autopm: |
5220 | /* Balance the usb_autopm_get_interface() above */ | |
5221 | usb_autopm_put_interface_no_suspend(intf); | |
32a69589 | 5222 | out_hdev_lock: |
eb6e2924 | 5223 | usb_unlock_device(hdev); |
1da177e4 | 5224 | |
32a69589 PM |
5225 | /* Balance the stuff in kick_hub_wq() and allow autosuspend */ |
5226 | usb_autopm_put_interface(intf); | |
5227 | kref_put(&hub->kref, hub_release); | |
1da177e4 LT |
5228 | } |
5229 | ||
1e927d96 | 5230 | static const struct usb_device_id hub_id_table[] = { |
e6f30dea | 5231 | { .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
469271f8 | 5232 | | USB_DEVICE_ID_MATCH_INT_CLASS, |
e6f30dea ML |
5233 | .idVendor = USB_VENDOR_GENESYS_LOGIC, |
5234 | .bInterfaceClass = USB_CLASS_HUB, | |
5235 | .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, | |
1da177e4 LT |
5236 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
5237 | .bDeviceClass = USB_CLASS_HUB}, | |
5238 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
5239 | .bInterfaceClass = USB_CLASS_HUB}, | |
5240 | { } /* Terminating entry */ | |
5241 | }; | |
5242 | ||
039b3307 | 5243 | MODULE_DEVICE_TABLE(usb, hub_id_table); |
1da177e4 LT |
5244 | |
5245 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
5246 | .name = "hub", |
5247 | .probe = hub_probe, | |
5248 | .disconnect = hub_disconnect, | |
5249 | .suspend = hub_suspend, | |
5250 | .resume = hub_resume, | |
f07600cf | 5251 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
5252 | .pre_reset = hub_pre_reset, |
5253 | .post_reset = hub_post_reset, | |
c532b29a | 5254 | .unlocked_ioctl = hub_ioctl, |
1da177e4 | 5255 | .id_table = hub_id_table, |
40f122f3 | 5256 | .supports_autosuspend = 1, |
1da177e4 LT |
5257 | }; |
5258 | ||
5259 | int usb_hub_init(void) | |
5260 | { | |
1da177e4 LT |
5261 | if (usb_register(&hub_driver) < 0) { |
5262 | printk(KERN_ERR "%s: can't register hub driver\n", | |
5263 | usbcore_name); | |
5264 | return -1; | |
5265 | } | |
5266 | ||
32a69589 PM |
5267 | /* |
5268 | * The workqueue needs to be freezable to avoid interfering with | |
5269 | * USB-PERSIST port handover. Otherwise it might see that a full-speed | |
5270 | * device was gone before the EHCI controller had handed its port | |
5271 | * over to the companion full-speed controller. | |
32a69589 | 5272 | */ |
638139eb | 5273 | hub_wq = alloc_workqueue("usb_hub_wq", WQ_FREEZABLE, 0); |
32a69589 | 5274 | if (hub_wq) |
1da177e4 | 5275 | return 0; |
1da177e4 LT |
5276 | |
5277 | /* Fall through if kernel_thread failed */ | |
5278 | usb_deregister(&hub_driver); | |
32a69589 | 5279 | pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name); |
1da177e4 LT |
5280 | |
5281 | return -1; | |
5282 | } | |
5283 | ||
5284 | void usb_hub_cleanup(void) | |
5285 | { | |
32a69589 | 5286 | destroy_workqueue(hub_wq); |
1da177e4 LT |
5287 | |
5288 | /* | |
5289 | * Hub resources are freed for us by usb_deregister. It calls | |
5290 | * usb_driver_purge on every device which in turn calls that | |
5291 | * devices disconnect function if it is using this driver. | |
5292 | * The hub_disconnect function takes care of releasing the | |
5293 | * individual hub resources. -greg | |
5294 | */ | |
5295 | usb_deregister(&hub_driver); | |
5296 | } /* usb_hub_cleanup() */ | |
5297 | ||
eb764c4b | 5298 | static int descriptors_changed(struct usb_device *udev, |
e3376d6c XR |
5299 | struct usb_device_descriptor *old_device_descriptor, |
5300 | struct usb_host_bos *old_bos) | |
eb764c4b AS |
5301 | { |
5302 | int changed = 0; | |
5303 | unsigned index; | |
5304 | unsigned serial_len = 0; | |
5305 | unsigned len; | |
5306 | unsigned old_length; | |
5307 | int length; | |
5308 | char *buf; | |
5309 | ||
5310 | if (memcmp(&udev->descriptor, old_device_descriptor, | |
5311 | sizeof(*old_device_descriptor)) != 0) | |
5312 | return 1; | |
5313 | ||
e3376d6c XR |
5314 | if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) |
5315 | return 1; | |
5316 | if (udev->bos) { | |
b9a10481 XR |
5317 | len = le16_to_cpu(udev->bos->desc->wTotalLength); |
5318 | if (len != le16_to_cpu(old_bos->desc->wTotalLength)) | |
e3376d6c | 5319 | return 1; |
b9a10481 | 5320 | if (memcmp(udev->bos->desc, old_bos->desc, len)) |
e3376d6c XR |
5321 | return 1; |
5322 | } | |
5323 | ||
eb764c4b AS |
5324 | /* Since the idVendor, idProduct, and bcdDevice values in the |
5325 | * device descriptor haven't changed, we will assume the | |
5326 | * Manufacturer and Product strings haven't changed either. | |
5327 | * But the SerialNumber string could be different (e.g., a | |
5328 | * different flash card of the same brand). | |
5329 | */ | |
5330 | if (udev->serial) | |
5331 | serial_len = strlen(udev->serial) + 1; | |
1da177e4 | 5332 | |
eb764c4b | 5333 | len = serial_len; |
1da177e4 | 5334 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b AS |
5335 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
5336 | len = max(len, old_length); | |
1da177e4 | 5337 | } |
eb764c4b | 5338 | |
0cc1a51f | 5339 | buf = kmalloc(len, GFP_NOIO); |
1da177e4 LT |
5340 | if (buf == NULL) { |
5341 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
5342 | /* assume the worst */ | |
5343 | return 1; | |
5344 | } | |
5345 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
eb764c4b | 5346 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
1da177e4 LT |
5347 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
5348 | old_length); | |
eb764c4b | 5349 | if (length != old_length) { |
1da177e4 LT |
5350 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
5351 | index, length); | |
eb764c4b | 5352 | changed = 1; |
1da177e4 LT |
5353 | break; |
5354 | } | |
039b3307 | 5355 | if (memcmp(buf, udev->rawdescriptors[index], old_length) |
1da177e4 LT |
5356 | != 0) { |
5357 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
eb764c4b AS |
5358 | index, |
5359 | ((struct usb_config_descriptor *) buf)-> | |
5360 | bConfigurationValue); | |
5361 | changed = 1; | |
1da177e4 LT |
5362 | break; |
5363 | } | |
5364 | } | |
eb764c4b AS |
5365 | |
5366 | if (!changed && serial_len) { | |
5367 | length = usb_string(udev, udev->descriptor.iSerialNumber, | |
5368 | buf, serial_len); | |
5369 | if (length + 1 != serial_len) { | |
5370 | dev_dbg(&udev->dev, "serial string error %d\n", | |
5371 | length); | |
5372 | changed = 1; | |
5373 | } else if (memcmp(buf, udev->serial, length) != 0) { | |
5374 | dev_dbg(&udev->dev, "serial string changed\n"); | |
5375 | changed = 1; | |
5376 | } | |
5377 | } | |
5378 | ||
1da177e4 | 5379 | kfree(buf); |
eb764c4b | 5380 | return changed; |
1da177e4 LT |
5381 | } |
5382 | ||
5383 | /** | |
742120c6 | 5384 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
1da177e4 LT |
5385 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
5386 | * | |
79efa097 AS |
5387 | * WARNING - don't use this routine to reset a composite device |
5388 | * (one with multiple interfaces owned by separate drivers)! | |
742120c6 | 5389 | * Use usb_reset_device() instead. |
1da177e4 LT |
5390 | * |
5391 | * Do a port reset, reassign the device's address, and establish its | |
5392 | * former operating configuration. If the reset fails, or the device's | |
5393 | * descriptors change from their values before the reset, or the original | |
5394 | * configuration and altsettings cannot be restored, a flag will be set | |
37ebb549 | 5395 | * telling hub_wq to pretend the device has been disconnected and then |
1da177e4 LT |
5396 | * re-connected. All drivers will be unbound, and the device will be |
5397 | * re-enumerated and probed all over again. | |
5398 | * | |
626f090c | 5399 | * Return: 0 if the reset succeeded, -ENODEV if the device has been |
1da177e4 LT |
5400 | * flagged for logical disconnection, or some other negative error code |
5401 | * if the reset wasn't even attempted. | |
5402 | * | |
626f090c | 5403 | * Note: |
5c79a1e3 DW |
5404 | * The caller must own the device lock and the port lock, the latter is |
5405 | * taken by usb_reset_device(). For example, it's safe to use | |
5406 | * usb_reset_device() from a driver probe() routine after downloading | |
5407 | * new firmware. For calls that might not occur during probe(), drivers | |
5408 | * should lock the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
5409 | * |
5410 | * Locking exception: This routine may also be called from within an | |
5411 | * autoresume handler. Such usage won't conflict with other tasks | |
5412 | * holding the device lock because these tasks should always call | |
5c79a1e3 DW |
5413 | * usb_autopm_resume_device(), thereby preventing any unwanted |
5414 | * autoresume. The autoresume handler is expected to have already | |
5415 | * acquired the port lock before calling this routine. | |
1da177e4 | 5416 | */ |
742120c6 | 5417 | static int usb_reset_and_verify_device(struct usb_device *udev) |
1da177e4 LT |
5418 | { |
5419 | struct usb_device *parent_hdev = udev->parent; | |
5420 | struct usb_hub *parent_hub; | |
3f0479e0 | 5421 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 5422 | struct usb_device_descriptor descriptor = udev->descriptor; |
e3376d6c | 5423 | struct usb_host_bos *bos; |
7a7b562d | 5424 | int i, j, ret = 0; |
12c3da34 | 5425 | int port1 = udev->portnum; |
1da177e4 LT |
5426 | |
5427 | if (udev->state == USB_STATE_NOTATTACHED || | |
5428 | udev->state == USB_STATE_SUSPENDED) { | |
5429 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5430 | udev->state); | |
5431 | return -EINVAL; | |
5432 | } | |
5433 | ||
5c79a1e3 | 5434 | if (!parent_hdev) |
1da177e4 | 5435 | return -EISDIR; |
5c79a1e3 | 5436 | |
ad493e5e | 5437 | parent_hub = usb_hub_to_struct_hub(parent_hdev); |
1da177e4 | 5438 | |
dcc01c08 SS |
5439 | /* Disable USB2 hardware LPM. |
5440 | * It will be re-enabled by the enumeration process. | |
5441 | */ | |
5442 | if (udev->usb2_hw_lpm_enabled == 1) | |
5443 | usb_set_usb2_hardware_lpm(udev, 0); | |
5444 | ||
f74631e3 SS |
5445 | /* Disable LPM and LTM while we reset the device and reinstall the alt |
5446 | * settings. Device-initiated LPM settings, and system exit latency | |
5447 | * settings are cleared when the device is reset, so we have to set | |
5448 | * them up again. | |
6d1d0513 SS |
5449 | */ |
5450 | ret = usb_unlocked_disable_lpm(udev); | |
5451 | if (ret) { | |
5452 | dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); | |
464ad8c4 | 5453 | goto re_enumerate_no_bos; |
6d1d0513 | 5454 | } |
f74631e3 SS |
5455 | ret = usb_disable_ltm(udev); |
5456 | if (ret) { | |
5457 | dev_err(&udev->dev, "%s Failed to disable LTM\n.", | |
5458 | __func__); | |
464ad8c4 | 5459 | goto re_enumerate_no_bos; |
f74631e3 | 5460 | } |
6d1d0513 | 5461 | |
464ad8c4 | 5462 | bos = udev->bos; |
e5bdfd50 | 5463 | udev->bos = NULL; |
464ad8c4 | 5464 | |
1da177e4 LT |
5465 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { |
5466 | ||
5467 | /* ep0 maxpacket size may change; let the HCD know about it. | |
5468 | * Other endpoints will be handled by re-enumeration. */ | |
fc721f51 | 5469 | usb_ep0_reinit(udev); |
1da177e4 | 5470 | ret = hub_port_init(parent_hub, udev, port1, i); |
dd4dd19e | 5471 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
5472 | break; |
5473 | } | |
d5cbad4b | 5474 | |
1da177e4 LT |
5475 | if (ret < 0) |
5476 | goto re_enumerate; | |
469271f8 | 5477 | |
1da177e4 | 5478 | /* Device might have changed firmware (DFU or similar) */ |
e3376d6c | 5479 | if (descriptors_changed(udev, &descriptor, bos)) { |
1da177e4 LT |
5480 | dev_info(&udev->dev, "device firmware changed\n"); |
5481 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
5482 | goto re_enumerate; | |
469271f8 | 5483 | } |
4fe0387a AS |
5484 | |
5485 | /* Restore the device's previous configuration */ | |
1da177e4 LT |
5486 | if (!udev->actconfig) |
5487 | goto done; | |
3f0479e0 | 5488 | |
d673bfcb | 5489 | mutex_lock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5490 | ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); |
5491 | if (ret < 0) { | |
5492 | dev_warn(&udev->dev, | |
5493 | "Busted HC? Not enough HCD resources for " | |
5494 | "old configuration.\n"); | |
d673bfcb | 5495 | mutex_unlock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5496 | goto re_enumerate; |
5497 | } | |
1da177e4 LT |
5498 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
5499 | USB_REQ_SET_CONFIGURATION, 0, | |
5500 | udev->actconfig->desc.bConfigurationValue, 0, | |
5501 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
5502 | if (ret < 0) { | |
5503 | dev_err(&udev->dev, | |
5504 | "can't restore configuration #%d (error=%d)\n", | |
5505 | udev->actconfig->desc.bConfigurationValue, ret); | |
d673bfcb | 5506 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 | 5507 | goto re_enumerate; |
469271f8 | 5508 | } |
d673bfcb | 5509 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 LT |
5510 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
5511 | ||
4fe0387a AS |
5512 | /* Put interfaces back into the same altsettings as before. |
5513 | * Don't bother to send the Set-Interface request for interfaces | |
5514 | * that were already in altsetting 0; besides being unnecessary, | |
5515 | * many devices can't handle it. Instead just reset the host-side | |
5516 | * endpoint state. | |
5517 | */ | |
1da177e4 | 5518 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
3f0479e0 SS |
5519 | struct usb_host_config *config = udev->actconfig; |
5520 | struct usb_interface *intf = config->interface[i]; | |
1da177e4 LT |
5521 | struct usb_interface_descriptor *desc; |
5522 | ||
1da177e4 | 5523 | desc = &intf->cur_altsetting->desc; |
4fe0387a AS |
5524 | if (desc->bAlternateSetting == 0) { |
5525 | usb_disable_interface(udev, intf, true); | |
5526 | usb_enable_interface(udev, intf, true); | |
5527 | ret = 0; | |
5528 | } else { | |
04a723ea SS |
5529 | /* Let the bandwidth allocation function know that this |
5530 | * device has been reset, and it will have to use | |
5531 | * alternate setting 0 as the current alternate setting. | |
3f0479e0 | 5532 | */ |
04a723ea | 5533 | intf->resetting_device = 1; |
4fe0387a AS |
5534 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
5535 | desc->bAlternateSetting); | |
04a723ea | 5536 | intf->resetting_device = 0; |
4fe0387a | 5537 | } |
1da177e4 LT |
5538 | if (ret < 0) { |
5539 | dev_err(&udev->dev, "failed to restore interface %d " | |
5540 | "altsetting %d (error=%d)\n", | |
5541 | desc->bInterfaceNumber, | |
5542 | desc->bAlternateSetting, | |
5543 | ret); | |
5544 | goto re_enumerate; | |
5545 | } | |
7a7b562d HG |
5546 | /* Resetting also frees any allocated streams */ |
5547 | for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) | |
5548 | intf->cur_altsetting->endpoint[j].streams = 0; | |
1da177e4 LT |
5549 | } |
5550 | ||
5551 | done: | |
f74631e3 | 5552 | /* Now that the alt settings are re-installed, enable LTM and LPM. */ |
de68bab4 | 5553 | usb_set_usb2_hardware_lpm(udev, 1); |
8306095f | 5554 | usb_unlocked_enable_lpm(udev); |
f74631e3 | 5555 | usb_enable_ltm(udev); |
e5bdfd50 GKH |
5556 | usb_release_bos_descriptor(udev); |
5557 | udev->bos = bos; | |
1da177e4 | 5558 | return 0; |
469271f8 | 5559 | |
1da177e4 | 5560 | re_enumerate: |
e3376d6c XR |
5561 | usb_release_bos_descriptor(udev); |
5562 | udev->bos = bos; | |
464ad8c4 HY |
5563 | re_enumerate_no_bos: |
5564 | /* LPM state doesn't matter when we're about to destroy the device. */ | |
5565 | hub_port_logical_disconnect(parent_hub, port1); | |
1da177e4 LT |
5566 | return -ENODEV; |
5567 | } | |
79efa097 AS |
5568 | |
5569 | /** | |
742120c6 | 5570 | * usb_reset_device - warn interface drivers and perform a USB port reset |
79efa097 | 5571 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
79efa097 AS |
5572 | * |
5573 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
5574 | * method), performs the port reset, and then lets the drivers know that | |
5575 | * the reset is over (using their post_reset method). | |
5576 | * | |
626f090c | 5577 | * Return: The same as for usb_reset_and_verify_device(). |
79efa097 | 5578 | * |
626f090c | 5579 | * Note: |
79efa097 AS |
5580 | * The caller must own the device lock. For example, it's safe to use |
5581 | * this from a driver probe() routine after downloading new firmware. | |
5582 | * For calls that might not occur during probe(), drivers should lock | |
5583 | * the device using usb_lock_device_for_reset(). | |
78d9a487 AS |
5584 | * |
5585 | * If an interface is currently being probed or disconnected, we assume | |
5586 | * its driver knows how to handle resets. For all other interfaces, | |
5587 | * if the driver doesn't have pre_reset and post_reset methods then | |
5588 | * we attempt to unbind it and rebind afterward. | |
79efa097 | 5589 | */ |
742120c6 | 5590 | int usb_reset_device(struct usb_device *udev) |
79efa097 AS |
5591 | { |
5592 | int ret; | |
852c4b43 | 5593 | int i; |
4d769def | 5594 | unsigned int noio_flag; |
5c79a1e3 | 5595 | struct usb_port *port_dev; |
79efa097 | 5596 | struct usb_host_config *config = udev->actconfig; |
5c79a1e3 | 5597 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
79efa097 AS |
5598 | |
5599 | if (udev->state == USB_STATE_NOTATTACHED || | |
5600 | udev->state == USB_STATE_SUSPENDED) { | |
5601 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5602 | udev->state); | |
5603 | return -EINVAL; | |
5604 | } | |
5605 | ||
5c79a1e3 DW |
5606 | if (!udev->parent) { |
5607 | /* this requires hcd-specific logic; see ohci_restart() */ | |
5608 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); | |
5609 | return -EISDIR; | |
5610 | } | |
5611 | ||
5612 | port_dev = hub->ports[udev->portnum - 1]; | |
5613 | ||
4d769def ML |
5614 | /* |
5615 | * Don't allocate memory with GFP_KERNEL in current | |
5616 | * context to avoid possible deadlock if usb mass | |
5617 | * storage interface or usbnet interface(iSCSI case) | |
5618 | * is included in current configuration. The easist | |
5619 | * approach is to do it for every device reset, | |
5620 | * because the device 'memalloc_noio' flag may have | |
5621 | * not been set before reseting the usb device. | |
5622 | */ | |
5623 | noio_flag = memalloc_noio_save(); | |
5624 | ||
645daaab | 5625 | /* Prevent autosuspend during the reset */ |
94fcda1f | 5626 | usb_autoresume_device(udev); |
645daaab | 5627 | |
79efa097 | 5628 | if (config) { |
79efa097 | 5629 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
852c4b43 AS |
5630 | struct usb_interface *cintf = config->interface[i]; |
5631 | struct usb_driver *drv; | |
78d9a487 | 5632 | int unbind = 0; |
852c4b43 AS |
5633 | |
5634 | if (cintf->dev.driver) { | |
79efa097 | 5635 | drv = to_usb_driver(cintf->dev.driver); |
78d9a487 AS |
5636 | if (drv->pre_reset && drv->post_reset) |
5637 | unbind = (drv->pre_reset)(cintf); | |
5638 | else if (cintf->condition == | |
5639 | USB_INTERFACE_BOUND) | |
5640 | unbind = 1; | |
5641 | if (unbind) | |
5642 | usb_forced_unbind_intf(cintf); | |
79efa097 AS |
5643 | } |
5644 | } | |
5645 | } | |
5646 | ||
5c79a1e3 | 5647 | usb_lock_port(port_dev); |
742120c6 | 5648 | ret = usb_reset_and_verify_device(udev); |
5c79a1e3 | 5649 | usb_unlock_port(port_dev); |
79efa097 AS |
5650 | |
5651 | if (config) { | |
79efa097 | 5652 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
852c4b43 AS |
5653 | struct usb_interface *cintf = config->interface[i]; |
5654 | struct usb_driver *drv; | |
78d9a487 | 5655 | int rebind = cintf->needs_binding; |
852c4b43 | 5656 | |
78d9a487 | 5657 | if (!rebind && cintf->dev.driver) { |
79efa097 AS |
5658 | drv = to_usb_driver(cintf->dev.driver); |
5659 | if (drv->post_reset) | |
78d9a487 AS |
5660 | rebind = (drv->post_reset)(cintf); |
5661 | else if (cintf->condition == | |
5662 | USB_INTERFACE_BOUND) | |
5663 | rebind = 1; | |
6aec044c AS |
5664 | if (rebind) |
5665 | cintf->needs_binding = 1; | |
79efa097 | 5666 | } |
79efa097 | 5667 | } |
6aec044c | 5668 | usb_unbind_and_rebind_marked_interfaces(udev); |
79efa097 AS |
5669 | } |
5670 | ||
94fcda1f | 5671 | usb_autosuspend_device(udev); |
4d769def | 5672 | memalloc_noio_restore(noio_flag); |
79efa097 AS |
5673 | return ret; |
5674 | } | |
742120c6 | 5675 | EXPORT_SYMBOL_GPL(usb_reset_device); |
dc023dce IPG |
5676 | |
5677 | ||
5678 | /** | |
5679 | * usb_queue_reset_device - Reset a USB device from an atomic context | |
5680 | * @iface: USB interface belonging to the device to reset | |
5681 | * | |
5682 | * This function can be used to reset a USB device from an atomic | |
5683 | * context, where usb_reset_device() won't work (as it blocks). | |
5684 | * | |
5685 | * Doing a reset via this method is functionally equivalent to calling | |
5686 | * usb_reset_device(), except for the fact that it is delayed to a | |
5687 | * workqueue. This means that any drivers bound to other interfaces | |
5688 | * might be unbound, as well as users from usbfs in user space. | |
5689 | * | |
5690 | * Corner cases: | |
5691 | * | |
5692 | * - Scheduling two resets at the same time from two different drivers | |
5693 | * attached to two different interfaces of the same device is | |
5694 | * possible; depending on how the driver attached to each interface | |
5695 | * handles ->pre_reset(), the second reset might happen or not. | |
5696 | * | |
524134d4 AS |
5697 | * - If the reset is delayed so long that the interface is unbound from |
5698 | * its driver, the reset will be skipped. | |
dc023dce | 5699 | * |
524134d4 AS |
5700 | * - This function can be called during .probe(). It can also be called |
5701 | * during .disconnect(), but doing so is pointless because the reset | |
5702 | * will not occur. If you really want to reset the device during | |
5703 | * .disconnect(), call usb_reset_device() directly -- but watch out | |
5704 | * for nested unbinding issues! | |
dc023dce IPG |
5705 | */ |
5706 | void usb_queue_reset_device(struct usb_interface *iface) | |
5707 | { | |
524134d4 AS |
5708 | if (schedule_work(&iface->reset_ws)) |
5709 | usb_get_intf(iface); | |
dc023dce IPG |
5710 | } |
5711 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); | |
ff823c79 LT |
5712 | |
5713 | /** | |
5714 | * usb_hub_find_child - Get the pointer of child device | |
5715 | * attached to the port which is specified by @port1. | |
5716 | * @hdev: USB device belonging to the usb hub | |
5717 | * @port1: port num to indicate which port the child device | |
5718 | * is attached to. | |
5719 | * | |
5720 | * USB drivers call this function to get hub's child device | |
5721 | * pointer. | |
5722 | * | |
626f090c | 5723 | * Return: %NULL if input param is invalid and |
ff823c79 LT |
5724 | * child's usb_device pointer if non-NULL. |
5725 | */ | |
5726 | struct usb_device *usb_hub_find_child(struct usb_device *hdev, | |
5727 | int port1) | |
5728 | { | |
ad493e5e | 5729 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
ff823c79 LT |
5730 | |
5731 | if (port1 < 1 || port1 > hdev->maxchild) | |
5732 | return NULL; | |
5733 | return hub->ports[port1 - 1]->child; | |
5734 | } | |
5735 | EXPORT_SYMBOL_GPL(usb_hub_find_child); | |
d5575424 | 5736 | |
d2123fd9 LT |
5737 | void usb_hub_adjust_deviceremovable(struct usb_device *hdev, |
5738 | struct usb_hub_descriptor *desc) | |
5739 | { | |
d99f6b41 | 5740 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
d2123fd9 LT |
5741 | enum usb_port_connect_type connect_type; |
5742 | int i; | |
5743 | ||
d99f6b41 DW |
5744 | if (!hub) |
5745 | return; | |
5746 | ||
d2123fd9 LT |
5747 | if (!hub_is_superspeed(hdev)) { |
5748 | for (i = 1; i <= hdev->maxchild; i++) { | |
d99f6b41 | 5749 | struct usb_port *port_dev = hub->ports[i - 1]; |
d2123fd9 | 5750 | |
d99f6b41 | 5751 | connect_type = port_dev->connect_type; |
d2123fd9 LT |
5752 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
5753 | u8 mask = 1 << (i%8); | |
5754 | ||
5755 | if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { | |
d99f6b41 | 5756 | dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
d2123fd9 LT |
5757 | desc->u.hs.DeviceRemovable[i/8] |= mask; |
5758 | } | |
5759 | } | |
5760 | } | |
5761 | } else { | |
5762 | u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); | |
5763 | ||
5764 | for (i = 1; i <= hdev->maxchild; i++) { | |
d99f6b41 | 5765 | struct usb_port *port_dev = hub->ports[i - 1]; |
d2123fd9 | 5766 | |
d99f6b41 | 5767 | connect_type = port_dev->connect_type; |
d2123fd9 LT |
5768 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
5769 | u16 mask = 1 << i; | |
5770 | ||
5771 | if (!(port_removable & mask)) { | |
d99f6b41 | 5772 | dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
d2123fd9 LT |
5773 | port_removable |= mask; |
5774 | } | |
5775 | } | |
5776 | } | |
5777 | ||
5778 | desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); | |
5779 | } | |
5780 | } | |
5781 | ||
d5575424 LT |
5782 | #ifdef CONFIG_ACPI |
5783 | /** | |
5784 | * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle | |
5785 | * @hdev: USB device belonging to the usb hub | |
5786 | * @port1: port num of the port | |
5787 | * | |
626f090c YB |
5788 | * Return: Port's acpi handle if successful, %NULL if params are |
5789 | * invalid. | |
d5575424 LT |
5790 | */ |
5791 | acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, | |
5792 | int port1) | |
5793 | { | |
ad493e5e | 5794 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
d5575424 | 5795 | |
41341261 MN |
5796 | if (!hub) |
5797 | return NULL; | |
5798 | ||
3a83f992 | 5799 | return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); |
d5575424 LT |
5800 | } |
5801 | #endif |