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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> |
9c8d6178 | 25 | #include <linux/kthread.h> |
4186ecf8 | 26 | #include <linux/mutex.h> |
7dfb7103 | 27 | #include <linux/freezer.h> |
b04b3156 | 28 | #include <linux/random.h> |
ad493e5e | 29 | #include <linux/pm_qos.h> |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <asm/uaccess.h> |
32 | #include <asm/byteorder.h> | |
33 | ||
6e30d7cb | 34 | #include "hub.h" |
1da177e4 | 35 | |
e6f30dea ML |
36 | #define USB_VENDOR_GENESYS_LOGIC 0x05e3 |
37 | #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 | |
38 | ||
dbe79bbe JY |
39 | static inline int hub_is_superspeed(struct usb_device *hdev) |
40 | { | |
7bf01185 | 41 | return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS); |
dbe79bbe | 42 | } |
1bb5f66b | 43 | |
fa286188 | 44 | /* Protect struct usb_device->state and ->children members |
9ad3d6cc | 45 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
46 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
47 | static DEFINE_SPINLOCK(device_state_lock); | |
48 | ||
49 | /* khubd's worklist and its lock */ | |
50 | static DEFINE_SPINLOCK(hub_event_lock); | |
51 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ | |
52 | ||
53 | /* Wakes up khubd */ | |
54 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); | |
55 | ||
9c8d6178 | 56 | static struct task_struct *khubd_task; |
1da177e4 LT |
57 | |
58 | /* cycle leds on hubs that aren't blinking for attention */ | |
90ab5ee9 | 59 | static bool blinkenlights = 0; |
1da177e4 LT |
60 | module_param (blinkenlights, bool, S_IRUGO); |
61 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); | |
62 | ||
fd7c519d JK |
63 | /* |
64 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about | |
65 | * 10 seconds to send reply for the initial 64-byte descriptor request. | |
66 | */ | |
67 | /* define initial 64-byte descriptor request timeout in milliseconds */ | |
68 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; | |
69 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); | |
b9cef6c3 WF |
70 | MODULE_PARM_DESC(initial_descriptor_timeout, |
71 | "initial 64-byte descriptor request timeout in milliseconds " | |
72 | "(default 5000 - 5.0 seconds)"); | |
fd7c519d | 73 | |
1da177e4 LT |
74 | /* |
75 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
76 | * closely resembles the way Windows works. Hopefully it will be compatible | |
77 | * with a wider range of devices than the old scheme. However some previously | |
78 | * working devices may start giving rise to "device not accepting address" | |
79 | * errors; if that happens the user can try the old scheme by adjusting the | |
80 | * following module parameters. | |
81 | * | |
82 | * For maximum flexibility there are two boolean parameters to control the | |
83 | * hub driver's behavior. On the first initialization attempt, if the | |
84 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
85 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
86 | * is set, then the driver will make another attempt, using the other scheme. | |
87 | */ | |
90ab5ee9 | 88 | static bool old_scheme_first = 0; |
1da177e4 LT |
89 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); |
90 | MODULE_PARM_DESC(old_scheme_first, | |
91 | "start with the old device initialization scheme"); | |
92 | ||
90ab5ee9 | 93 | static bool use_both_schemes = 1; |
1da177e4 LT |
94 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); |
95 | MODULE_PARM_DESC(use_both_schemes, | |
96 | "try the other device initialization scheme if the " | |
97 | "first one fails"); | |
98 | ||
32fe0198 AS |
99 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
100 | * port reset on some companion controllers. | |
101 | */ | |
102 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); | |
103 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); | |
104 | ||
ad493e5e | 105 | #define HUB_DEBOUNCE_TIMEOUT 2000 |
948fea37 AS |
106 | #define HUB_DEBOUNCE_STEP 25 |
107 | #define HUB_DEBOUNCE_STABLE 100 | |
108 | ||
742120c6 ML |
109 | static int usb_reset_and_verify_device(struct usb_device *udev); |
110 | ||
131dec34 | 111 | static inline char *portspeed(struct usb_hub *hub, int portstatus) |
1da177e4 | 112 | { |
131dec34 SS |
113 | if (hub_is_superspeed(hub->hdev)) |
114 | return "5.0 Gb/s"; | |
288ead45 | 115 | if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
469271f8 | 116 | return "480 Mb/s"; |
288ead45 | 117 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
1da177e4 LT |
118 | return "1.5 Mb/s"; |
119 | else | |
120 | return "12 Mb/s"; | |
121 | } | |
1da177e4 LT |
122 | |
123 | /* Note that hdev or one of its children must be locked! */ | |
ad493e5e | 124 | struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) |
1da177e4 | 125 | { |
ff823c79 | 126 | if (!hdev || !hdev->actconfig || !hdev->maxchild) |
25118084 | 127 | return NULL; |
1da177e4 LT |
128 | return usb_get_intfdata(hdev->actconfig->interface[0]); |
129 | } | |
130 | ||
140e3026 | 131 | static int usb_device_supports_lpm(struct usb_device *udev) |
d9b2099c SS |
132 | { |
133 | /* USB 2.1 (and greater) devices indicate LPM support through | |
134 | * their USB 2.0 Extended Capabilities BOS descriptor. | |
135 | */ | |
136 | if (udev->speed == USB_SPEED_HIGH) { | |
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"); | |
160 | return 0; | |
161 | } | |
162 | ||
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 | ||
303 | if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER) | |
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 | ||
415 | /* | |
416 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
417 | * for info about using port indicators | |
418 | */ | |
419 | static void set_port_led( | |
420 | struct usb_hub *hub, | |
421 | int port1, | |
422 | int selector | |
423 | ) | |
424 | { | |
425 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
426 | USB_PORT_FEAT_INDICATOR); | |
427 | if (status < 0) | |
428 | dev_dbg (hub->intfdev, | |
429 | "port %d indicator %s status %d\n", | |
430 | port1, | |
431 | ({ char *s; switch (selector) { | |
432 | case HUB_LED_AMBER: s = "amber"; break; | |
433 | case HUB_LED_GREEN: s = "green"; break; | |
434 | case HUB_LED_OFF: s = "off"; break; | |
435 | case HUB_LED_AUTO: s = "auto"; break; | |
436 | default: s = "??"; break; | |
2b84f92b | 437 | } s; }), |
1da177e4 LT |
438 | status); |
439 | } | |
440 | ||
441 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
442 | ||
c4028958 | 443 | static void led_work (struct work_struct *work) |
1da177e4 | 444 | { |
c4028958 DH |
445 | struct usb_hub *hub = |
446 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
447 | struct usb_device *hdev = hub->hdev; |
448 | unsigned i; | |
449 | unsigned changed = 0; | |
450 | int cursor = -1; | |
451 | ||
452 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
453 | return; | |
454 | ||
3bbc47d8 | 455 | for (i = 0; i < hdev->maxchild; i++) { |
1da177e4 LT |
456 | unsigned selector, mode; |
457 | ||
458 | /* 30%-50% duty cycle */ | |
459 | ||
460 | switch (hub->indicator[i]) { | |
461 | /* cycle marker */ | |
462 | case INDICATOR_CYCLE: | |
463 | cursor = i; | |
464 | selector = HUB_LED_AUTO; | |
465 | mode = INDICATOR_AUTO; | |
466 | break; | |
467 | /* blinking green = sw attention */ | |
468 | case INDICATOR_GREEN_BLINK: | |
469 | selector = HUB_LED_GREEN; | |
470 | mode = INDICATOR_GREEN_BLINK_OFF; | |
471 | break; | |
472 | case INDICATOR_GREEN_BLINK_OFF: | |
473 | selector = HUB_LED_OFF; | |
474 | mode = INDICATOR_GREEN_BLINK; | |
475 | break; | |
476 | /* blinking amber = hw attention */ | |
477 | case INDICATOR_AMBER_BLINK: | |
478 | selector = HUB_LED_AMBER; | |
479 | mode = INDICATOR_AMBER_BLINK_OFF; | |
480 | break; | |
481 | case INDICATOR_AMBER_BLINK_OFF: | |
482 | selector = HUB_LED_OFF; | |
483 | mode = INDICATOR_AMBER_BLINK; | |
484 | break; | |
485 | /* blink green/amber = reserved */ | |
486 | case INDICATOR_ALT_BLINK: | |
487 | selector = HUB_LED_GREEN; | |
488 | mode = INDICATOR_ALT_BLINK_OFF; | |
489 | break; | |
490 | case INDICATOR_ALT_BLINK_OFF: | |
491 | selector = HUB_LED_AMBER; | |
492 | mode = INDICATOR_ALT_BLINK; | |
493 | break; | |
494 | default: | |
495 | continue; | |
496 | } | |
497 | if (selector != HUB_LED_AUTO) | |
498 | changed = 1; | |
499 | set_port_led(hub, i + 1, selector); | |
500 | hub->indicator[i] = mode; | |
501 | } | |
502 | if (!changed && blinkenlights) { | |
503 | cursor++; | |
3bbc47d8 | 504 | cursor %= hdev->maxchild; |
1da177e4 LT |
505 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); |
506 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
507 | changed++; | |
508 | } | |
509 | if (changed) | |
22f6a0f0 SD |
510 | queue_delayed_work(system_power_efficient_wq, |
511 | &hub->leds, LED_CYCLE_PERIOD); | |
1da177e4 LT |
512 | } |
513 | ||
514 | /* use a short timeout for hub/port status fetches */ | |
515 | #define USB_STS_TIMEOUT 1000 | |
516 | #define USB_STS_RETRIES 5 | |
517 | ||
518 | /* | |
519 | * USB 2.0 spec Section 11.24.2.6 | |
520 | */ | |
521 | static int get_hub_status(struct usb_device *hdev, | |
522 | struct usb_hub_status *data) | |
523 | { | |
524 | int i, status = -ETIMEDOUT; | |
525 | ||
3824c1dd LP |
526 | for (i = 0; i < USB_STS_RETRIES && |
527 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 LT |
528 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
529 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
530 | data, sizeof(*data), USB_STS_TIMEOUT); | |
531 | } | |
532 | return status; | |
533 | } | |
534 | ||
535 | /* | |
536 | * USB 2.0 spec Section 11.24.2.7 | |
537 | */ | |
538 | static int get_port_status(struct usb_device *hdev, int port1, | |
539 | struct usb_port_status *data) | |
540 | { | |
541 | int i, status = -ETIMEDOUT; | |
542 | ||
3824c1dd LP |
543 | for (i = 0; i < USB_STS_RETRIES && |
544 | (status == -ETIMEDOUT || status == -EPIPE); i++) { | |
1da177e4 LT |
545 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
546 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, | |
547 | data, sizeof(*data), USB_STS_TIMEOUT); | |
548 | } | |
549 | return status; | |
550 | } | |
551 | ||
3eb14915 AS |
552 | static int hub_port_status(struct usb_hub *hub, int port1, |
553 | u16 *status, u16 *change) | |
554 | { | |
555 | int ret; | |
556 | ||
557 | mutex_lock(&hub->status_mutex); | |
558 | ret = get_port_status(hub->hdev, port1, &hub->status->port); | |
559 | if (ret < 4) { | |
e9e88fb7 AS |
560 | if (ret != -ENODEV) |
561 | dev_err(hub->intfdev, | |
562 | "%s failed (err = %d)\n", __func__, ret); | |
3eb14915 AS |
563 | if (ret >= 0) |
564 | ret = -EIO; | |
565 | } else { | |
566 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
567 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
dbe79bbe | 568 | |
3eb14915 AS |
569 | ret = 0; |
570 | } | |
571 | mutex_unlock(&hub->status_mutex); | |
572 | return ret; | |
573 | } | |
574 | ||
1da177e4 LT |
575 | static void kick_khubd(struct usb_hub *hub) |
576 | { | |
577 | unsigned long flags; | |
578 | ||
579 | spin_lock_irqsave(&hub_event_lock, flags); | |
2e2c5eea | 580 | if (!hub->disconnected && list_empty(&hub->event_list)) { |
1da177e4 | 581 | list_add_tail(&hub->event_list, &hub_event_list); |
8e4ceb38 AS |
582 | |
583 | /* Suppress autosuspend until khubd runs */ | |
584 | usb_autopm_get_interface_no_resume( | |
585 | to_usb_interface(hub->intfdev)); | |
1da177e4 LT |
586 | wake_up(&khubd_wait); |
587 | } | |
588 | spin_unlock_irqrestore(&hub_event_lock, flags); | |
589 | } | |
590 | ||
591 | void usb_kick_khubd(struct usb_device *hdev) | |
592 | { | |
ad493e5e | 593 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
25118084 AS |
594 | |
595 | if (hub) | |
596 | kick_khubd(hub); | |
1da177e4 LT |
597 | } |
598 | ||
4ee823b8 SS |
599 | /* |
600 | * Let the USB core know that a USB 3.0 device has sent a Function Wake Device | |
601 | * Notification, which indicates it had initiated remote wakeup. | |
602 | * | |
603 | * USB 3.0 hubs do not report the port link state change from U3 to U0 when the | |
604 | * device initiates resume, so the USB core will not receive notice of the | |
605 | * resume through the normal hub interrupt URB. | |
606 | */ | |
607 | void usb_wakeup_notification(struct usb_device *hdev, | |
608 | unsigned int portnum) | |
609 | { | |
610 | struct usb_hub *hub; | |
611 | ||
612 | if (!hdev) | |
613 | return; | |
614 | ||
ad493e5e | 615 | hub = usb_hub_to_struct_hub(hdev); |
4ee823b8 SS |
616 | if (hub) { |
617 | set_bit(portnum, hub->wakeup_bits); | |
618 | kick_khubd(hub); | |
619 | } | |
620 | } | |
621 | EXPORT_SYMBOL_GPL(usb_wakeup_notification); | |
1da177e4 LT |
622 | |
623 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 624 | static void hub_irq(struct urb *urb) |
1da177e4 | 625 | { |
ec17cf1c | 626 | struct usb_hub *hub = urb->context; |
e015268d | 627 | int status = urb->status; |
71d2718f | 628 | unsigned i; |
1da177e4 LT |
629 | unsigned long bits; |
630 | ||
e015268d | 631 | switch (status) { |
1da177e4 LT |
632 | case -ENOENT: /* synchronous unlink */ |
633 | case -ECONNRESET: /* async unlink */ | |
634 | case -ESHUTDOWN: /* hardware going away */ | |
635 | return; | |
636 | ||
637 | default: /* presumably an error */ | |
638 | /* Cause a hub reset after 10 consecutive errors */ | |
e015268d | 639 | dev_dbg (hub->intfdev, "transfer --> %d\n", status); |
1da177e4 LT |
640 | if ((++hub->nerrors < 10) || hub->error) |
641 | goto resubmit; | |
e015268d | 642 | hub->error = status; |
1da177e4 | 643 | /* FALL THROUGH */ |
ec17cf1c | 644 | |
1da177e4 LT |
645 | /* let khubd handle things */ |
646 | case 0: /* we got data: port status changed */ | |
647 | bits = 0; | |
648 | for (i = 0; i < urb->actual_length; ++i) | |
649 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
650 | << (i*8); | |
651 | hub->event_bits[0] = bits; | |
652 | break; | |
653 | } | |
654 | ||
655 | hub->nerrors = 0; | |
656 | ||
657 | /* Something happened, let khubd figure it out */ | |
658 | kick_khubd(hub); | |
659 | ||
660 | resubmit: | |
661 | if (hub->quiescing) | |
662 | return; | |
663 | ||
664 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 | |
665 | && status != -ENODEV && status != -EPERM) | |
666 | dev_err (hub->intfdev, "resubmit --> %d\n", status); | |
667 | } | |
668 | ||
669 | /* USB 2.0 spec Section 11.24.2.3 */ | |
670 | static inline int | |
671 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) | |
672 | { | |
2c7b871b WG |
673 | /* Need to clear both directions for control ep */ |
674 | if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == | |
675 | USB_ENDPOINT_XFER_CONTROL) { | |
676 | int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
677 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, | |
678 | devinfo ^ 0x8000, tt, NULL, 0, 1000); | |
679 | if (status) | |
680 | return status; | |
681 | } | |
c2f6595f | 682 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
1da177e4 LT |
683 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
684 | tt, NULL, 0, 1000); | |
685 | } | |
686 | ||
687 | /* | |
688 | * enumeration blocks khubd for a long time. we use keventd instead, since | |
689 | * long blocking there is the exception, not the rule. accordingly, HCDs | |
690 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
691 | * both can talk to the same hub concurrently. | |
692 | */ | |
cb88a1b8 | 693 | static void hub_tt_work(struct work_struct *work) |
1da177e4 | 694 | { |
c4028958 | 695 | struct usb_hub *hub = |
cb88a1b8 | 696 | container_of(work, struct usb_hub, tt.clear_work); |
1da177e4 LT |
697 | unsigned long flags; |
698 | ||
699 | spin_lock_irqsave (&hub->tt.lock, flags); | |
3b6054da | 700 | while (!list_empty(&hub->tt.clear_list)) { |
d0f830d3 | 701 | struct list_head *next; |
1da177e4 LT |
702 | struct usb_tt_clear *clear; |
703 | struct usb_device *hdev = hub->hdev; | |
cb88a1b8 | 704 | const struct hc_driver *drv; |
1da177e4 LT |
705 | int status; |
706 | ||
d0f830d3 HS |
707 | next = hub->tt.clear_list.next; |
708 | clear = list_entry (next, struct usb_tt_clear, clear_list); | |
1da177e4 LT |
709 | list_del (&clear->clear_list); |
710 | ||
711 | /* drop lock so HCD can concurrently report other TT errors */ | |
712 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
713 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); | |
e9e88fb7 | 714 | if (status && status != -ENODEV) |
1da177e4 LT |
715 | dev_err (&hdev->dev, |
716 | "clear tt %d (%04x) error %d\n", | |
717 | clear->tt, clear->devinfo, status); | |
cb88a1b8 AS |
718 | |
719 | /* Tell the HCD, even if the operation failed */ | |
720 | drv = clear->hcd->driver; | |
721 | if (drv->clear_tt_buffer_complete) | |
722 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); | |
723 | ||
1bc3c9e1 | 724 | kfree(clear); |
cb88a1b8 | 725 | spin_lock_irqsave(&hub->tt.lock, flags); |
1da177e4 LT |
726 | } |
727 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
728 | } | |
729 | ||
971fcd49 LT |
730 | /** |
731 | * usb_hub_set_port_power - control hub port's power state | |
41341261 MN |
732 | * @hdev: USB device belonging to the usb hub |
733 | * @hub: target hub | |
971fcd49 LT |
734 | * @port1: port index |
735 | * @set: expected status | |
736 | * | |
737 | * call this function to control port's power via setting or | |
738 | * clearing the port's PORT_POWER feature. | |
626f090c YB |
739 | * |
740 | * Return: 0 if successful. A negative error code otherwise. | |
971fcd49 | 741 | */ |
41341261 MN |
742 | int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, |
743 | int port1, bool set) | |
971fcd49 LT |
744 | { |
745 | int ret; | |
ad493e5e | 746 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
971fcd49 LT |
747 | |
748 | if (set) | |
749 | ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); | |
750 | else | |
ad493e5e LT |
751 | ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
752 | ||
753 | if (!ret) | |
754 | port_dev->power_is_on = set; | |
971fcd49 LT |
755 | return ret; |
756 | } | |
757 | ||
1da177e4 | 758 | /** |
cb88a1b8 AS |
759 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
760 | * @urb: an URB associated with the failed or incomplete split transaction | |
1da177e4 LT |
761 | * |
762 | * High speed HCDs use this to tell the hub driver that some split control or | |
763 | * bulk transaction failed in a way that requires clearing internal state of | |
764 | * a transaction translator. This is normally detected (and reported) from | |
765 | * interrupt context. | |
766 | * | |
767 | * It may not be possible for that hub to handle additional full (or low) | |
768 | * speed transactions until that state is fully cleared out. | |
626f090c YB |
769 | * |
770 | * Return: 0 if successful. A negative error code otherwise. | |
1da177e4 | 771 | */ |
cb88a1b8 | 772 | int usb_hub_clear_tt_buffer(struct urb *urb) |
1da177e4 | 773 | { |
cb88a1b8 AS |
774 | struct usb_device *udev = urb->dev; |
775 | int pipe = urb->pipe; | |
1da177e4 LT |
776 | struct usb_tt *tt = udev->tt; |
777 | unsigned long flags; | |
778 | struct usb_tt_clear *clear; | |
779 | ||
780 | /* we've got to cope with an arbitrary number of pending TT clears, | |
781 | * since each TT has "at least two" buffers that can need it (and | |
782 | * there can be many TTs per hub). even if they're uncommon. | |
783 | */ | |
54e6ecb2 | 784 | if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
1da177e4 LT |
785 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
786 | /* FIXME recover somehow ... RESET_TT? */ | |
cb88a1b8 | 787 | return -ENOMEM; |
1da177e4 LT |
788 | } |
789 | ||
790 | /* info that CLEAR_TT_BUFFER needs */ | |
791 | clear->tt = tt->multi ? udev->ttport : 1; | |
792 | clear->devinfo = usb_pipeendpoint (pipe); | |
793 | clear->devinfo |= udev->devnum << 4; | |
794 | clear->devinfo |= usb_pipecontrol (pipe) | |
795 | ? (USB_ENDPOINT_XFER_CONTROL << 11) | |
796 | : (USB_ENDPOINT_XFER_BULK << 11); | |
797 | if (usb_pipein (pipe)) | |
798 | clear->devinfo |= 1 << 15; | |
cb88a1b8 AS |
799 | |
800 | /* info for completion callback */ | |
801 | clear->hcd = bus_to_hcd(udev->bus); | |
802 | clear->ep = urb->ep; | |
803 | ||
1da177e4 LT |
804 | /* tell keventd to clear state for this TT */ |
805 | spin_lock_irqsave (&tt->lock, flags); | |
806 | list_add_tail (&clear->clear_list, &tt->clear_list); | |
cb88a1b8 | 807 | schedule_work(&tt->clear_work); |
1da177e4 | 808 | spin_unlock_irqrestore (&tt->lock, flags); |
cb88a1b8 | 809 | return 0; |
1da177e4 | 810 | } |
cb88a1b8 | 811 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
1da177e4 | 812 | |
8520f380 AS |
813 | /* If do_delay is false, return the number of milliseconds the caller |
814 | * needs to delay. | |
815 | */ | |
816 | static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) | |
1da177e4 LT |
817 | { |
818 | int port1; | |
b789696a | 819 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
8520f380 | 820 | unsigned delay; |
4489a571 AS |
821 | u16 wHubCharacteristics = |
822 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
823 | ||
824 | /* Enable power on each port. Some hubs have reserved values | |
825 | * of LPSM (> 2) in their descriptors, even though they are | |
826 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
827 | * but only emulate it. In all cases, the ports won't work | |
828 | * unless we send these messages to the hub. | |
829 | */ | |
830 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) | |
1da177e4 | 831 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
832 | else |
833 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
834 | "non-switchable hub\n"); | |
3bbc47d8 | 835 | for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) |
ad493e5e LT |
836 | if (hub->ports[port1 - 1]->power_is_on) |
837 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); | |
838 | else | |
839 | usb_clear_port_feature(hub->hdev, port1, | |
840 | USB_PORT_FEAT_POWER); | |
1da177e4 | 841 | |
b789696a | 842 | /* Wait at least 100 msec for power to become stable */ |
8520f380 AS |
843 | delay = max(pgood_delay, (unsigned) 100); |
844 | if (do_delay) | |
845 | msleep(delay); | |
846 | return delay; | |
1da177e4 LT |
847 | } |
848 | ||
1da177e4 LT |
849 | static int hub_hub_status(struct usb_hub *hub, |
850 | u16 *status, u16 *change) | |
851 | { | |
852 | int ret; | |
853 | ||
db90e7a1 | 854 | mutex_lock(&hub->status_mutex); |
1da177e4 | 855 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
e9e88fb7 AS |
856 | if (ret < 0) { |
857 | if (ret != -ENODEV) | |
858 | dev_err(hub->intfdev, | |
859 | "%s failed (err = %d)\n", __func__, ret); | |
860 | } else { | |
1da177e4 | 861 | *status = le16_to_cpu(hub->status->hub.wHubStatus); |
469271f8 | 862 | *change = le16_to_cpu(hub->status->hub.wHubChange); |
1da177e4 LT |
863 | ret = 0; |
864 | } | |
db90e7a1 | 865 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
866 | return ret; |
867 | } | |
868 | ||
41e7e056 SS |
869 | static int hub_set_port_link_state(struct usb_hub *hub, int port1, |
870 | unsigned int link_status) | |
871 | { | |
872 | return set_port_feature(hub->hdev, | |
873 | port1 | (link_status << 3), | |
874 | USB_PORT_FEAT_LINK_STATE); | |
875 | } | |
876 | ||
877 | /* | |
878 | * If USB 3.0 ports are placed into the Disabled state, they will no longer | |
879 | * detect any device connects or disconnects. This is generally not what the | |
880 | * USB core wants, since it expects a disabled port to produce a port status | |
881 | * change event when a new device connects. | |
882 | * | |
883 | * Instead, set the link state to Disabled, wait for the link to settle into | |
884 | * that state, clear any change bits, and then put the port into the RxDetect | |
885 | * state. | |
886 | */ | |
887 | static int hub_usb3_port_disable(struct usb_hub *hub, int port1) | |
888 | { | |
889 | int ret; | |
890 | int total_time; | |
891 | u16 portchange, portstatus; | |
892 | ||
893 | if (!hub_is_superspeed(hub->hdev)) | |
894 | return -EINVAL; | |
895 | ||
896 | ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); | |
e9e88fb7 | 897 | if (ret) |
41e7e056 | 898 | return ret; |
41e7e056 SS |
899 | |
900 | /* Wait for the link to enter the disabled state. */ | |
901 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
902 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
903 | if (ret < 0) | |
904 | return ret; | |
905 | ||
906 | if ((portstatus & USB_PORT_STAT_LINK_STATE) == | |
907 | USB_SS_PORT_LS_SS_DISABLED) | |
908 | break; | |
909 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
910 | break; | |
911 | msleep(HUB_DEBOUNCE_STEP); | |
912 | } | |
913 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
914 | dev_warn(hub->intfdev, "Could not disable port %d after %d ms\n", | |
915 | port1, total_time); | |
916 | ||
917 | return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); | |
918 | } | |
919 | ||
8b28c752 AS |
920 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
921 | { | |
922 | struct usb_device *hdev = hub->hdev; | |
0458d5b4 | 923 | int ret = 0; |
8b28c752 | 924 | |
ff823c79 LT |
925 | if (hub->ports[port1 - 1]->child && set_state) |
926 | usb_set_device_state(hub->ports[port1 - 1]->child, | |
8b28c752 | 927 | USB_STATE_NOTATTACHED); |
41e7e056 SS |
928 | if (!hub->error) { |
929 | if (hub_is_superspeed(hub->hdev)) | |
930 | ret = hub_usb3_port_disable(hub, port1); | |
931 | else | |
ad493e5e | 932 | ret = usb_clear_port_feature(hdev, port1, |
41e7e056 SS |
933 | USB_PORT_FEAT_ENABLE); |
934 | } | |
e9e88fb7 | 935 | if (ret && ret != -ENODEV) |
8b28c752 | 936 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", |
0458d5b4 | 937 | port1, ret); |
8b28c752 AS |
938 | return ret; |
939 | } | |
940 | ||
0458d5b4 | 941 | /* |
6d42fcdb | 942 | * Disable a port and mark a logical connect-change event, so that some |
0458d5b4 AS |
943 | * time later khubd will disconnect() any existing usb_device on the port |
944 | * and will re-enumerate if there actually is a device attached. | |
945 | */ | |
946 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
947 | { | |
948 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); | |
949 | hub_port_disable(hub, port1, 1); | |
7d069b7d | 950 | |
0458d5b4 AS |
951 | /* FIXME let caller ask to power down the port: |
952 | * - some devices won't enumerate without a VBUS power cycle | |
953 | * - SRP saves power that way | |
954 | * - ... new call, TBD ... | |
955 | * That's easy if this hub can switch power per-port, and | |
956 | * khubd reactivates the port later (timer, SRP, etc). | |
957 | * Powerdown must be optional, because of reset/DFU. | |
958 | */ | |
959 | ||
960 | set_bit(port1, hub->change_bits); | |
469271f8 | 961 | kick_khubd(hub); |
0458d5b4 AS |
962 | } |
963 | ||
253e0572 AS |
964 | /** |
965 | * usb_remove_device - disable a device's port on its parent hub | |
966 | * @udev: device to be disabled and removed | |
967 | * Context: @udev locked, must be able to sleep. | |
968 | * | |
969 | * After @udev's port has been disabled, khubd is notified and it will | |
970 | * see that the device has been disconnected. When the device is | |
971 | * physically unplugged and something is plugged in, the events will | |
972 | * be received and processed normally. | |
626f090c YB |
973 | * |
974 | * Return: 0 if successful. A negative error code otherwise. | |
253e0572 AS |
975 | */ |
976 | int usb_remove_device(struct usb_device *udev) | |
977 | { | |
978 | struct usb_hub *hub; | |
979 | struct usb_interface *intf; | |
980 | ||
981 | if (!udev->parent) /* Can't remove a root hub */ | |
982 | return -EINVAL; | |
ad493e5e | 983 | hub = usb_hub_to_struct_hub(udev->parent); |
253e0572 AS |
984 | intf = to_usb_interface(hub->intfdev); |
985 | ||
986 | usb_autopm_get_interface(intf); | |
987 | set_bit(udev->portnum, hub->removed_bits); | |
988 | hub_port_logical_disconnect(hub, udev->portnum); | |
989 | usb_autopm_put_interface(intf); | |
990 | return 0; | |
991 | } | |
992 | ||
6ee0b270 | 993 | enum hub_activation_type { |
8e4ceb38 | 994 | HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
8520f380 | 995 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
6ee0b270 | 996 | }; |
5e6effae | 997 | |
8520f380 AS |
998 | static void hub_init_func2(struct work_struct *ws); |
999 | static void hub_init_func3(struct work_struct *ws); | |
1000 | ||
f2835219 | 1001 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
5e6effae AS |
1002 | { |
1003 | struct usb_device *hdev = hub->hdev; | |
653a39d1 SS |
1004 | struct usb_hcd *hcd; |
1005 | int ret; | |
5e6effae | 1006 | int port1; |
f2835219 | 1007 | int status; |
948fea37 | 1008 | bool need_debounce_delay = false; |
8520f380 AS |
1009 | unsigned delay; |
1010 | ||
1011 | /* Continue a partial initialization */ | |
1012 | if (type == HUB_INIT2) | |
1013 | goto init2; | |
1014 | if (type == HUB_INIT3) | |
1015 | goto init3; | |
5e6effae | 1016 | |
a45aa3b3 EF |
1017 | /* The superspeed hub except for root hub has to use Hub Depth |
1018 | * value as an offset into the route string to locate the bits | |
1019 | * it uses to determine the downstream port number. So hub driver | |
1020 | * should send a set hub depth request to superspeed hub after | |
1021 | * the superspeed hub is set configuration in initialization or | |
1022 | * reset procedure. | |
1023 | * | |
1024 | * After a resume, port power should still be on. | |
f2835219 AS |
1025 | * For any other type of activation, turn it on. |
1026 | */ | |
8520f380 | 1027 | if (type != HUB_RESUME) { |
a45aa3b3 EF |
1028 | if (hdev->parent && hub_is_superspeed(hdev)) { |
1029 | ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
1030 | HUB_SET_DEPTH, USB_RT_HUB, | |
1031 | hdev->level - 1, 0, NULL, 0, | |
1032 | USB_CTRL_SET_TIMEOUT); | |
1033 | if (ret < 0) | |
1034 | dev_err(hub->intfdev, | |
1035 | "set hub depth failed\n"); | |
1036 | } | |
8520f380 AS |
1037 | |
1038 | /* Speed up system boot by using a delayed_work for the | |
1039 | * hub's initial power-up delays. This is pretty awkward | |
1040 | * and the implementation looks like a home-brewed sort of | |
1041 | * setjmp/longjmp, but it saves at least 100 ms for each | |
1042 | * root hub (assuming usbcore is compiled into the kernel | |
1043 | * rather than as a module). It adds up. | |
1044 | * | |
1045 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME | |
1046 | * because for those activation types the ports have to be | |
1047 | * operational when we return. In theory this could be done | |
1048 | * for HUB_POST_RESET, but it's easier not to. | |
1049 | */ | |
1050 | if (type == HUB_INIT) { | |
1051 | delay = hub_power_on(hub, false); | |
1052 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); | |
22f6a0f0 SD |
1053 | queue_delayed_work(system_power_efficient_wq, |
1054 | &hub->init_work, | |
8520f380 | 1055 | msecs_to_jiffies(delay)); |
61fbeba1 AS |
1056 | |
1057 | /* Suppress autosuspend until init is done */ | |
8e4ceb38 AS |
1058 | usb_autopm_get_interface_no_resume( |
1059 | to_usb_interface(hub->intfdev)); | |
8520f380 | 1060 | return; /* Continues at init2: below */ |
653a39d1 SS |
1061 | } else if (type == HUB_RESET_RESUME) { |
1062 | /* The internal host controller state for the hub device | |
1063 | * may be gone after a host power loss on system resume. | |
1064 | * Update the device's info so the HW knows it's a hub. | |
1065 | */ | |
1066 | hcd = bus_to_hcd(hdev->bus); | |
1067 | if (hcd->driver->update_hub_device) { | |
1068 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1069 | &hub->tt, GFP_NOIO); | |
1070 | if (ret < 0) { | |
1071 | dev_err(hub->intfdev, "Host not " | |
1072 | "accepting hub info " | |
1073 | "update.\n"); | |
1074 | dev_err(hub->intfdev, "LS/FS devices " | |
1075 | "and hubs may not work " | |
1076 | "under this hub\n."); | |
1077 | } | |
1078 | } | |
1079 | hub_power_on(hub, true); | |
8520f380 AS |
1080 | } else { |
1081 | hub_power_on(hub, true); | |
1082 | } | |
1083 | } | |
1084 | init2: | |
f2835219 | 1085 | |
6ee0b270 AS |
1086 | /* Check each port and set hub->change_bits to let khubd know |
1087 | * which ports need attention. | |
5e6effae AS |
1088 | */ |
1089 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
ff823c79 | 1090 | struct usb_device *udev = hub->ports[port1 - 1]->child; |
5e6effae AS |
1091 | u16 portstatus, portchange; |
1092 | ||
6ee0b270 AS |
1093 | portstatus = portchange = 0; |
1094 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
1095 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
1096 | dev_dbg(hub->intfdev, | |
1097 | "port %d: status %04x change %04x\n", | |
1098 | port1, portstatus, portchange); | |
1099 | ||
1100 | /* After anything other than HUB_RESUME (i.e., initialization | |
1101 | * or any sort of reset), every port should be disabled. | |
1102 | * Unconnected ports should likewise be disabled (paranoia), | |
1103 | * and so should ports for which we have no usb_device. | |
1104 | */ | |
1105 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( | |
1106 | type != HUB_RESUME || | |
1107 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
1108 | !udev || | |
1109 | udev->state == USB_STATE_NOTATTACHED)) { | |
9f0a6cd3 AX |
1110 | /* |
1111 | * USB3 protocol ports will automatically transition | |
1112 | * to Enabled state when detect an USB3.0 device attach. | |
fd1ac4cf DW |
1113 | * Do not disable USB3 protocol ports, just pretend |
1114 | * power was lost | |
9f0a6cd3 | 1115 | */ |
fd1ac4cf DW |
1116 | portstatus &= ~USB_PORT_STAT_ENABLE; |
1117 | if (!hub_is_superspeed(hdev)) | |
ad493e5e | 1118 | usb_clear_port_feature(hdev, port1, |
9f0a6cd3 | 1119 | USB_PORT_FEAT_ENABLE); |
5e6effae AS |
1120 | } |
1121 | ||
948fea37 AS |
1122 | /* Clear status-change flags; we'll debounce later */ |
1123 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
1124 | need_debounce_delay = true; | |
ad493e5e | 1125 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1126 | USB_PORT_FEAT_C_CONNECTION); |
1127 | } | |
1128 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
1129 | need_debounce_delay = true; | |
ad493e5e | 1130 | usb_clear_port_feature(hub->hdev, port1, |
948fea37 AS |
1131 | USB_PORT_FEAT_C_ENABLE); |
1132 | } | |
e92aee33 JW |
1133 | if (portchange & USB_PORT_STAT_C_RESET) { |
1134 | need_debounce_delay = true; | |
1135 | usb_clear_port_feature(hub->hdev, port1, | |
1136 | USB_PORT_FEAT_C_RESET); | |
1137 | } | |
79c3dd81 DZ |
1138 | if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
1139 | hub_is_superspeed(hub->hdev)) { | |
1140 | need_debounce_delay = true; | |
ad493e5e | 1141 | usb_clear_port_feature(hub->hdev, port1, |
79c3dd81 DZ |
1142 | USB_PORT_FEAT_C_BH_PORT_RESET); |
1143 | } | |
253e0572 AS |
1144 | /* We can forget about a "removed" device when there's a |
1145 | * physical disconnect or the connect status changes. | |
1146 | */ | |
1147 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
1148 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
1149 | clear_bit(port1, hub->removed_bits); | |
1150 | ||
6ee0b270 AS |
1151 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
1152 | /* Tell khubd to disconnect the device or | |
1153 | * check for a new connection | |
1154 | */ | |
08d1dec6 SG |
1155 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || |
1156 | (portstatus & USB_PORT_STAT_OVERCURRENT)) | |
6ee0b270 AS |
1157 | set_bit(port1, hub->change_bits); |
1158 | ||
1159 | } else if (portstatus & USB_PORT_STAT_ENABLE) { | |
72937e1e SS |
1160 | bool port_resumed = (portstatus & |
1161 | USB_PORT_STAT_LINK_STATE) == | |
1162 | USB_SS_PORT_LS_U0; | |
6ee0b270 AS |
1163 | /* The power session apparently survived the resume. |
1164 | * If there was an overcurrent or suspend change | |
1165 | * (i.e., remote wakeup request), have khubd | |
72937e1e SS |
1166 | * take care of it. Look at the port link state |
1167 | * for USB 3.0 hubs, since they don't have a suspend | |
1168 | * change bit, and they don't set the port link change | |
1169 | * bit on device-initiated resume. | |
6ee0b270 | 1170 | */ |
72937e1e SS |
1171 | if (portchange || (hub_is_superspeed(hub->hdev) && |
1172 | port_resumed)) | |
6ee0b270 | 1173 | set_bit(port1, hub->change_bits); |
5e6effae | 1174 | |
6ee0b270 | 1175 | } else if (udev->persist_enabled) { |
ad493e5e LT |
1176 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
1177 | ||
6ee0b270 | 1178 | #ifdef CONFIG_PM |
5e6effae | 1179 | udev->reset_resume = 1; |
6ee0b270 | 1180 | #endif |
ad493e5e LT |
1181 | /* Don't set the change_bits when the device |
1182 | * was powered off. | |
1183 | */ | |
1184 | if (port_dev->power_is_on) | |
1185 | set_bit(port1, hub->change_bits); | |
8808f00c | 1186 | |
6ee0b270 AS |
1187 | } else { |
1188 | /* The power session is gone; tell khubd */ | |
1189 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
1190 | set_bit(port1, hub->change_bits); | |
5e6effae | 1191 | } |
5e6effae AS |
1192 | } |
1193 | ||
948fea37 AS |
1194 | /* If no port-status-change flags were set, we don't need any |
1195 | * debouncing. If flags were set we can try to debounce the | |
1196 | * ports all at once right now, instead of letting khubd do them | |
1197 | * one at a time later on. | |
1198 | * | |
1199 | * If any port-status changes do occur during this delay, khubd | |
1200 | * will see them later and handle them normally. | |
1201 | */ | |
8520f380 AS |
1202 | if (need_debounce_delay) { |
1203 | delay = HUB_DEBOUNCE_STABLE; | |
1204 | ||
1205 | /* Don't do a long sleep inside a workqueue routine */ | |
1206 | if (type == HUB_INIT2) { | |
1207 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); | |
22f6a0f0 SD |
1208 | queue_delayed_work(system_power_efficient_wq, |
1209 | &hub->init_work, | |
8520f380 AS |
1210 | msecs_to_jiffies(delay)); |
1211 | return; /* Continues at init3: below */ | |
1212 | } else { | |
1213 | msleep(delay); | |
1214 | } | |
1215 | } | |
1216 | init3: | |
f2835219 AS |
1217 | hub->quiescing = 0; |
1218 | ||
1219 | status = usb_submit_urb(hub->urb, GFP_NOIO); | |
1220 | if (status < 0) | |
1221 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
1222 | if (hub->has_indicators && blinkenlights) | |
22f6a0f0 SD |
1223 | queue_delayed_work(system_power_efficient_wq, |
1224 | &hub->leds, LED_CYCLE_PERIOD); | |
f2835219 AS |
1225 | |
1226 | /* Scan all ports that need attention */ | |
1227 | kick_khubd(hub); | |
8e4ceb38 AS |
1228 | |
1229 | /* Allow autosuspend if it was suppressed */ | |
1230 | if (type <= HUB_INIT3) | |
1231 | usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); | |
5e6effae AS |
1232 | } |
1233 | ||
8520f380 AS |
1234 | /* Implement the continuations for the delays above */ |
1235 | static void hub_init_func2(struct work_struct *ws) | |
1236 | { | |
1237 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
1238 | ||
1239 | hub_activate(hub, HUB_INIT2); | |
1240 | } | |
1241 | ||
1242 | static void hub_init_func3(struct work_struct *ws) | |
1243 | { | |
1244 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
1245 | ||
1246 | hub_activate(hub, HUB_INIT3); | |
1247 | } | |
1248 | ||
4330354f AS |
1249 | enum hub_quiescing_type { |
1250 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND | |
1251 | }; | |
1252 | ||
1253 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) | |
1254 | { | |
1255 | struct usb_device *hdev = hub->hdev; | |
1256 | int i; | |
1257 | ||
8520f380 AS |
1258 | cancel_delayed_work_sync(&hub->init_work); |
1259 | ||
4330354f AS |
1260 | /* khubd and related activity won't re-trigger */ |
1261 | hub->quiescing = 1; | |
1262 | ||
1263 | if (type != HUB_SUSPEND) { | |
1264 | /* Disconnect all the children */ | |
1265 | for (i = 0; i < hdev->maxchild; ++i) { | |
ff823c79 LT |
1266 | if (hub->ports[i]->child) |
1267 | usb_disconnect(&hub->ports[i]->child); | |
4330354f AS |
1268 | } |
1269 | } | |
1270 | ||
1271 | /* Stop khubd and related activity */ | |
1272 | usb_kill_urb(hub->urb); | |
1273 | if (hub->has_indicators) | |
1274 | cancel_delayed_work_sync(&hub->leds); | |
1275 | if (hub->tt.hub) | |
036546bf | 1276 | flush_work(&hub->tt.clear_work); |
4330354f AS |
1277 | } |
1278 | ||
3eb14915 AS |
1279 | /* caller has locked the hub device */ |
1280 | static int hub_pre_reset(struct usb_interface *intf) | |
1281 | { | |
1282 | struct usb_hub *hub = usb_get_intfdata(intf); | |
1283 | ||
4330354f | 1284 | hub_quiesce(hub, HUB_PRE_RESET); |
f07600cf | 1285 | return 0; |
7d069b7d AS |
1286 | } |
1287 | ||
1288 | /* caller has locked the hub device */ | |
f07600cf | 1289 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 1290 | { |
7de18d8b AS |
1291 | struct usb_hub *hub = usb_get_intfdata(intf); |
1292 | ||
f2835219 | 1293 | hub_activate(hub, HUB_POST_RESET); |
f07600cf | 1294 | return 0; |
7d069b7d AS |
1295 | } |
1296 | ||
1da177e4 LT |
1297 | static int hub_configure(struct usb_hub *hub, |
1298 | struct usb_endpoint_descriptor *endpoint) | |
1299 | { | |
b356b7c7 | 1300 | struct usb_hcd *hcd; |
1da177e4 LT |
1301 | struct usb_device *hdev = hub->hdev; |
1302 | struct device *hub_dev = hub->intfdev; | |
1303 | u16 hubstatus, hubchange; | |
74ad9bd2 | 1304 | u16 wHubCharacteristics; |
1da177e4 | 1305 | unsigned int pipe; |
fa2a9566 | 1306 | int maxp, ret, i; |
7cbe5dca | 1307 | char *message = "out of memory"; |
430ee58e SAS |
1308 | unsigned unit_load; |
1309 | unsigned full_load; | |
1da177e4 | 1310 | |
d697cdda | 1311 | hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
1da177e4 | 1312 | if (!hub->buffer) { |
1da177e4 LT |
1313 | ret = -ENOMEM; |
1314 | goto fail; | |
1315 | } | |
1316 | ||
1317 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
1318 | if (!hub->status) { | |
1da177e4 LT |
1319 | ret = -ENOMEM; |
1320 | goto fail; | |
1321 | } | |
db90e7a1 | 1322 | mutex_init(&hub->status_mutex); |
1da177e4 LT |
1323 | |
1324 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
1325 | if (!hub->descriptor) { | |
1da177e4 LT |
1326 | ret = -ENOMEM; |
1327 | goto fail; | |
1328 | } | |
1329 | ||
1330 | /* Request the entire hub descriptor. | |
1331 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
1332 | * but the hub can/will return fewer bytes here. | |
1333 | */ | |
dbe79bbe | 1334 | ret = get_hub_descriptor(hdev, hub->descriptor); |
1da177e4 LT |
1335 | if (ret < 0) { |
1336 | message = "can't read hub descriptor"; | |
1337 | goto fail; | |
1338 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
1339 | message = "hub has too many ports!"; | |
1340 | ret = -ENODEV; | |
1341 | goto fail; | |
769d7368 DL |
1342 | } else if (hub->descriptor->bNbrPorts == 0) { |
1343 | message = "hub doesn't have any ports!"; | |
1344 | ret = -ENODEV; | |
1345 | goto fail; | |
1da177e4 LT |
1346 | } |
1347 | ||
1348 | hdev->maxchild = hub->descriptor->bNbrPorts; | |
1349 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, | |
1350 | (hdev->maxchild == 1) ? "" : "s"); | |
1351 | ||
fa2a9566 LT |
1352 | hub->ports = kzalloc(hdev->maxchild * sizeof(struct usb_port *), |
1353 | GFP_KERNEL); | |
ff823c79 | 1354 | if (!hub->ports) { |
7cbe5dca AS |
1355 | ret = -ENOMEM; |
1356 | goto fail; | |
1357 | } | |
1358 | ||
74ad9bd2 | 1359 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
430ee58e SAS |
1360 | if (hub_is_superspeed(hdev)) { |
1361 | unit_load = 150; | |
1362 | full_load = 900; | |
1363 | } else { | |
1364 | unit_load = 100; | |
1365 | full_load = 500; | |
1366 | } | |
1da177e4 | 1367 | |
dbe79bbe JY |
1368 | /* FIXME for USB 3.0, skip for now */ |
1369 | if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && | |
1370 | !(hub_is_superspeed(hdev))) { | |
1da177e4 | 1371 | int i; |
469271f8 | 1372 | char portstr[USB_MAXCHILDREN + 1]; |
1da177e4 LT |
1373 | |
1374 | for (i = 0; i < hdev->maxchild; i++) | |
dbe79bbe | 1375 | portstr[i] = hub->descriptor->u.hs.DeviceRemovable |
1da177e4 LT |
1376 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
1377 | ? 'F' : 'R'; | |
1378 | portstr[hdev->maxchild] = 0; | |
1379 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); | |
1380 | } else | |
1381 | dev_dbg(hub_dev, "standalone hub\n"); | |
1382 | ||
74ad9bd2 | 1383 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
7bf01185 AD |
1384 | case HUB_CHAR_COMMON_LPSM: |
1385 | dev_dbg(hub_dev, "ganged power switching\n"); | |
1386 | break; | |
1387 | case HUB_CHAR_INDV_PORT_LPSM: | |
1388 | dev_dbg(hub_dev, "individual port power switching\n"); | |
1389 | break; | |
1390 | case HUB_CHAR_NO_LPSM: | |
1391 | case HUB_CHAR_LPSM: | |
1392 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
1393 | break; | |
1da177e4 LT |
1394 | } |
1395 | ||
74ad9bd2 | 1396 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
7bf01185 AD |
1397 | case HUB_CHAR_COMMON_OCPM: |
1398 | dev_dbg(hub_dev, "global over-current protection\n"); | |
1399 | break; | |
1400 | case HUB_CHAR_INDV_PORT_OCPM: | |
1401 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
1402 | break; | |
1403 | case HUB_CHAR_NO_OCPM: | |
1404 | case HUB_CHAR_OCPM: | |
1405 | dev_dbg(hub_dev, "no over-current protection\n"); | |
1406 | break; | |
1da177e4 LT |
1407 | } |
1408 | ||
1409 | spin_lock_init (&hub->tt.lock); | |
1410 | INIT_LIST_HEAD (&hub->tt.clear_list); | |
cb88a1b8 | 1411 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
1da177e4 | 1412 | switch (hdev->descriptor.bDeviceProtocol) { |
7bf01185 AD |
1413 | case USB_HUB_PR_FS: |
1414 | break; | |
1415 | case USB_HUB_PR_HS_SINGLE_TT: | |
1416 | dev_dbg(hub_dev, "Single TT\n"); | |
1417 | hub->tt.hub = hdev; | |
1418 | break; | |
1419 | case USB_HUB_PR_HS_MULTI_TT: | |
1420 | ret = usb_set_interface(hdev, 0, 1); | |
1421 | if (ret == 0) { | |
1422 | dev_dbg(hub_dev, "TT per port\n"); | |
1423 | hub->tt.multi = 1; | |
1424 | } else | |
1425 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
1426 | ret); | |
1427 | hub->tt.hub = hdev; | |
1428 | break; | |
1429 | case USB_HUB_PR_SS: | |
1430 | /* USB 3.0 hubs don't have a TT */ | |
1431 | break; | |
1432 | default: | |
1433 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
1434 | hdev->descriptor.bDeviceProtocol); | |
1435 | break; | |
1da177e4 LT |
1436 | } |
1437 | ||
e09711ae | 1438 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 1439 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
469271f8 MB |
1440 | case HUB_TTTT_8_BITS: |
1441 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
1442 | hub->tt.think_time = 666; | |
e09711ae DB |
1443 | dev_dbg(hub_dev, "TT requires at most %d " |
1444 | "FS bit times (%d ns)\n", | |
469271f8 MB |
1445 | 8, hub->tt.think_time); |
1446 | } | |
1447 | break; | |
1448 | case HUB_TTTT_16_BITS: | |
1449 | hub->tt.think_time = 666 * 2; | |
1450 | dev_dbg(hub_dev, "TT requires at most %d " | |
1451 | "FS bit times (%d ns)\n", | |
1452 | 16, hub->tt.think_time); | |
1453 | break; | |
1454 | case HUB_TTTT_24_BITS: | |
1455 | hub->tt.think_time = 666 * 3; | |
1456 | dev_dbg(hub_dev, "TT requires at most %d " | |
1457 | "FS bit times (%d ns)\n", | |
1458 | 24, hub->tt.think_time); | |
1459 | break; | |
1460 | case HUB_TTTT_32_BITS: | |
1461 | hub->tt.think_time = 666 * 4; | |
1462 | dev_dbg(hub_dev, "TT requires at most %d " | |
1463 | "FS bit times (%d ns)\n", | |
1464 | 32, hub->tt.think_time); | |
1465 | break; | |
1da177e4 LT |
1466 | } |
1467 | ||
1468 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 1469 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
1470 | hub->has_indicators = 1; |
1471 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
1472 | } | |
1473 | ||
1474 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
1475 | hub->descriptor->bPwrOn2PwrGood * 2); | |
1476 | ||
1477 | /* power budgeting mostly matters with bus-powered hubs, | |
1478 | * and battery-powered root hubs (may provide just 8 mA). | |
1479 | */ | |
1480 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
15b7336e | 1481 | if (ret) { |
1da177e4 LT |
1482 | message = "can't get hub status"; |
1483 | goto fail; | |
1484 | } | |
430ee58e | 1485 | hcd = bus_to_hcd(hdev->bus); |
7d35b929 | 1486 | if (hdev == hdev->bus->root_hub) { |
430ee58e SAS |
1487 | if (hcd->power_budget > 0) |
1488 | hdev->bus_mA = hcd->power_budget; | |
1489 | else | |
1490 | hdev->bus_mA = full_load * hdev->maxchild; | |
1491 | if (hdev->bus_mA >= full_load) | |
1492 | hub->mA_per_port = full_load; | |
55c52718 AS |
1493 | else { |
1494 | hub->mA_per_port = hdev->bus_mA; | |
1495 | hub->limited_power = 1; | |
1496 | } | |
7d35b929 | 1497 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
430ee58e SAS |
1498 | int remaining = hdev->bus_mA - |
1499 | hub->descriptor->bHubContrCurrent; | |
1500 | ||
1da177e4 LT |
1501 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
1502 | hub->descriptor->bHubContrCurrent); | |
55c52718 | 1503 | hub->limited_power = 1; |
55c52718 | 1504 | |
430ee58e SAS |
1505 | if (remaining < hdev->maxchild * unit_load) |
1506 | dev_warn(hub_dev, | |
55c52718 AS |
1507 | "insufficient power available " |
1508 | "to use all downstream ports\n"); | |
430ee58e SAS |
1509 | hub->mA_per_port = unit_load; /* 7.2.1 */ |
1510 | ||
55c52718 AS |
1511 | } else { /* Self-powered external hub */ |
1512 | /* FIXME: What about battery-powered external hubs that | |
1513 | * provide less current per port? */ | |
430ee58e | 1514 | hub->mA_per_port = full_load; |
7d35b929 | 1515 | } |
430ee58e | 1516 | if (hub->mA_per_port < full_load) |
55c52718 AS |
1517 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", |
1518 | hub->mA_per_port); | |
1da177e4 | 1519 | |
b356b7c7 SS |
1520 | /* Update the HCD's internal representation of this hub before khubd |
1521 | * starts getting port status changes for devices under the hub. | |
1522 | */ | |
b356b7c7 SS |
1523 | if (hcd->driver->update_hub_device) { |
1524 | ret = hcd->driver->update_hub_device(hcd, hdev, | |
1525 | &hub->tt, GFP_KERNEL); | |
1526 | if (ret < 0) { | |
1527 | message = "can't update HCD hub info"; | |
1528 | goto fail; | |
1529 | } | |
1530 | } | |
1531 | ||
1da177e4 LT |
1532 | ret = hub_hub_status(hub, &hubstatus, &hubchange); |
1533 | if (ret < 0) { | |
1534 | message = "can't get hub status"; | |
1535 | goto fail; | |
1536 | } | |
1537 | ||
1538 | /* local power status reports aren't always correct */ | |
1539 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
1540 | dev_dbg(hub_dev, "local power source is %s\n", | |
1541 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
1542 | ? "lost (inactive)" : "good"); | |
1543 | ||
74ad9bd2 | 1544 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
1545 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
1546 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
1547 | ||
88fafff9 | 1548 | /* set up the interrupt endpoint |
1549 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
1550 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
1551 | * to send more data (and thus cause overflow). For root hubs, | |
1552 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
1553 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
1554 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
1555 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
1556 | ||
1557 | if (maxp > sizeof(*hub->buffer)) | |
1558 | maxp = sizeof(*hub->buffer); | |
1559 | ||
1560 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
1561 | if (!hub->urb) { | |
1da177e4 LT |
1562 | ret = -ENOMEM; |
1563 | goto fail; | |
1564 | } | |
1565 | ||
1566 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
1567 | hub, endpoint->bInterval); | |
1da177e4 LT |
1568 | |
1569 | /* maybe cycle the hub leds */ | |
1570 | if (hub->has_indicators && blinkenlights) | |
469271f8 | 1571 | hub->indicator[0] = INDICATOR_CYCLE; |
1da177e4 | 1572 | |
e58547eb KM |
1573 | for (i = 0; i < hdev->maxchild; i++) { |
1574 | ret = usb_hub_create_port_device(hub, i + 1); | |
1575 | if (ret < 0) { | |
fa2a9566 LT |
1576 | dev_err(hub->intfdev, |
1577 | "couldn't create port%d device.\n", i + 1); | |
e58547eb KM |
1578 | hdev->maxchild = i; |
1579 | goto fail_keep_maxchild; | |
1580 | } | |
1581 | } | |
fa2a9566 | 1582 | |
d2123fd9 LT |
1583 | usb_hub_adjust_deviceremovable(hdev, hub->descriptor); |
1584 | ||
f2835219 | 1585 | hub_activate(hub, HUB_INIT); |
1da177e4 LT |
1586 | return 0; |
1587 | ||
1588 | fail: | |
d0308d4b | 1589 | hdev->maxchild = 0; |
e58547eb | 1590 | fail_keep_maxchild: |
1da177e4 LT |
1591 | dev_err (hub_dev, "config failed, %s (err %d)\n", |
1592 | message, ret); | |
1593 | /* hub_disconnect() frees urb and descriptor */ | |
1594 | return ret; | |
1595 | } | |
1596 | ||
e8054854 AS |
1597 | static void hub_release(struct kref *kref) |
1598 | { | |
1599 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
1600 | ||
1601 | usb_put_intf(to_usb_interface(hub->intfdev)); | |
1602 | kfree(hub); | |
1603 | } | |
1604 | ||
1da177e4 LT |
1605 | static unsigned highspeed_hubs; |
1606 | ||
1607 | static void hub_disconnect(struct usb_interface *intf) | |
1608 | { | |
8816230e | 1609 | struct usb_hub *hub = usb_get_intfdata(intf); |
fa286188 | 1610 | struct usb_device *hdev = interface_to_usbdev(intf); |
543d7784 | 1611 | int port1; |
fa2a9566 | 1612 | |
e8054854 AS |
1613 | /* Take the hub off the event list and don't let it be added again */ |
1614 | spin_lock_irq(&hub_event_lock); | |
8e4ceb38 AS |
1615 | if (!list_empty(&hub->event_list)) { |
1616 | list_del_init(&hub->event_list); | |
1617 | usb_autopm_put_interface_no_suspend(intf); | |
1618 | } | |
e8054854 AS |
1619 | hub->disconnected = 1; |
1620 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 1621 | |
7de18d8b AS |
1622 | /* Disconnect all children and quiesce the hub */ |
1623 | hub->error = 0; | |
4330354f | 1624 | hub_quiesce(hub, HUB_DISCONNECT); |
7de18d8b | 1625 | |
543d7784 AS |
1626 | /* Avoid races with recursively_mark_NOTATTACHED() */ |
1627 | spin_lock_irq(&device_state_lock); | |
1628 | port1 = hdev->maxchild; | |
1629 | hdev->maxchild = 0; | |
1630 | usb_set_intfdata(intf, NULL); | |
1631 | spin_unlock_irq(&device_state_lock); | |
1f2235b8 | 1632 | |
543d7784 AS |
1633 | for (; port1 > 0; --port1) |
1634 | usb_hub_remove_port_device(hub, port1); | |
1da177e4 | 1635 | |
e8054854 | 1636 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
1637 | highspeed_hubs--; |
1638 | ||
1da177e4 | 1639 | usb_free_urb(hub->urb); |
fa2a9566 | 1640 | kfree(hub->ports); |
1bc3c9e1 | 1641 | kfree(hub->descriptor); |
1bc3c9e1 | 1642 | kfree(hub->status); |
d697cdda | 1643 | kfree(hub->buffer); |
1da177e4 | 1644 | |
971fcd49 | 1645 | pm_suspend_ignore_children(&intf->dev, false); |
e8054854 | 1646 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
1647 | } |
1648 | ||
1649 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
1650 | { | |
1651 | struct usb_host_interface *desc; | |
1652 | struct usb_endpoint_descriptor *endpoint; | |
1653 | struct usb_device *hdev; | |
1654 | struct usb_hub *hub; | |
1655 | ||
1656 | desc = intf->cur_altsetting; | |
1657 | hdev = interface_to_usbdev(intf); | |
1658 | ||
596d789a ML |
1659 | /* |
1660 | * Set default autosuspend delay as 0 to speedup bus suspend, | |
1661 | * based on the below considerations: | |
1662 | * | |
1663 | * - Unlike other drivers, the hub driver does not rely on the | |
1664 | * autosuspend delay to provide enough time to handle a wakeup | |
1665 | * event, and the submitted status URB is just to check future | |
1666 | * change on hub downstream ports, so it is safe to do it. | |
1667 | * | |
1668 | * - The patch might cause one or more auto supend/resume for | |
1669 | * below very rare devices when they are plugged into hub | |
1670 | * first time: | |
1671 | * | |
1672 | * devices having trouble initializing, and disconnect | |
1673 | * themselves from the bus and then reconnect a second | |
1674 | * or so later | |
1675 | * | |
1676 | * devices just for downloading firmware, and disconnects | |
1677 | * themselves after completing it | |
1678 | * | |
1679 | * For these quite rare devices, their drivers may change the | |
1680 | * autosuspend delay of their parent hub in the probe() to one | |
1681 | * appropriate value to avoid the subtle problem if someone | |
1682 | * does care it. | |
1683 | * | |
1684 | * - The patch may cause one or more auto suspend/resume on | |
1685 | * hub during running 'lsusb', but it is probably too | |
1686 | * infrequent to worry about. | |
1687 | * | |
1688 | * - Change autosuspend delay of hub can avoid unnecessary auto | |
1689 | * suspend timer for hub, also may decrease power consumption | |
1690 | * of USB bus. | |
1691 | */ | |
1692 | pm_runtime_set_autosuspend_delay(&hdev->dev, 0); | |
1693 | ||
2839f5bc SS |
1694 | /* Hubs have proper suspend/resume support. */ |
1695 | usb_enable_autosuspend(hdev); | |
088f7fec | 1696 | |
38f3ad5e | 1697 | if (hdev->level == MAX_TOPO_LEVEL) { |
b9cef6c3 WF |
1698 | dev_err(&intf->dev, |
1699 | "Unsupported bus topology: hub nested too deep\n"); | |
38f3ad5e FB |
1700 | return -E2BIG; |
1701 | } | |
1702 | ||
89ccbdc9 DB |
1703 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
1704 | if (hdev->parent) { | |
1705 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
1706 | return -ENODEV; | |
1707 | } | |
1708 | #endif | |
1709 | ||
1da177e4 LT |
1710 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
1711 | /* specs is not defined, but it works */ | |
1712 | if ((desc->desc.bInterfaceSubClass != 0) && | |
1713 | (desc->desc.bInterfaceSubClass != 1)) { | |
1714 | descriptor_error: | |
1715 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); | |
1716 | return -EIO; | |
1717 | } | |
1718 | ||
1719 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
1720 | if (desc->desc.bNumEndpoints != 1) | |
1721 | goto descriptor_error; | |
1722 | ||
1723 | endpoint = &desc->endpoint[0].desc; | |
1724 | ||
fbf81c29 LFC |
1725 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
1726 | if (!usb_endpoint_is_int_in(endpoint)) | |
1da177e4 LT |
1727 | goto descriptor_error; |
1728 | ||
1729 | /* We found a hub */ | |
1730 | dev_info (&intf->dev, "USB hub found\n"); | |
1731 | ||
0a1ef3b5 | 1732 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 LT |
1733 | if (!hub) { |
1734 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); | |
1735 | return -ENOMEM; | |
1736 | } | |
1737 | ||
e8054854 | 1738 | kref_init(&hub->kref); |
1da177e4 LT |
1739 | INIT_LIST_HEAD(&hub->event_list); |
1740 | hub->intfdev = &intf->dev; | |
1741 | hub->hdev = hdev; | |
c4028958 | 1742 | INIT_DELAYED_WORK(&hub->leds, led_work); |
8520f380 | 1743 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
e8054854 | 1744 | usb_get_intf(intf); |
1da177e4 LT |
1745 | |
1746 | usb_set_intfdata (intf, hub); | |
40f122f3 | 1747 | intf->needs_remote_wakeup = 1; |
971fcd49 | 1748 | pm_suspend_ignore_children(&intf->dev, true); |
1da177e4 LT |
1749 | |
1750 | if (hdev->speed == USB_SPEED_HIGH) | |
1751 | highspeed_hubs++; | |
1752 | ||
e6f30dea ML |
1753 | if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) |
1754 | hub->quirk_check_port_auto_suspend = 1; | |
1755 | ||
1da177e4 LT |
1756 | if (hub_configure(hub, endpoint) >= 0) |
1757 | return 0; | |
1758 | ||
1759 | hub_disconnect (intf); | |
1760 | return -ENODEV; | |
1761 | } | |
1762 | ||
1763 | static int | |
1764 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
1765 | { | |
1766 | struct usb_device *hdev = interface_to_usbdev (intf); | |
ad493e5e | 1767 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1da177e4 LT |
1768 | |
1769 | /* assert ifno == 0 (part of hub spec) */ | |
1770 | switch (code) { | |
1771 | case USBDEVFS_HUB_PORTINFO: { | |
1772 | struct usbdevfs_hub_portinfo *info = user_data; | |
1773 | int i; | |
1774 | ||
1775 | spin_lock_irq(&device_state_lock); | |
1776 | if (hdev->devnum <= 0) | |
1777 | info->nports = 0; | |
1778 | else { | |
1779 | info->nports = hdev->maxchild; | |
1780 | for (i = 0; i < info->nports; i++) { | |
ff823c79 | 1781 | if (hub->ports[i]->child == NULL) |
1da177e4 LT |
1782 | info->port[i] = 0; |
1783 | else | |
1784 | info->port[i] = | |
ff823c79 | 1785 | hub->ports[i]->child->devnum; |
1da177e4 LT |
1786 | } |
1787 | } | |
1788 | spin_unlock_irq(&device_state_lock); | |
1789 | ||
1790 | return info->nports + 1; | |
1791 | } | |
1792 | ||
1793 | default: | |
1794 | return -ENOSYS; | |
1795 | } | |
1796 | } | |
1797 | ||
7cbe5dca AS |
1798 | /* |
1799 | * Allow user programs to claim ports on a hub. When a device is attached | |
1800 | * to one of these "claimed" ports, the program will "own" the device. | |
1801 | */ | |
1802 | static int find_port_owner(struct usb_device *hdev, unsigned port1, | |
336c5c31 | 1803 | struct dev_state ***ppowner) |
7cbe5dca | 1804 | { |
41341261 MN |
1805 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
1806 | ||
7cbe5dca AS |
1807 | if (hdev->state == USB_STATE_NOTATTACHED) |
1808 | return -ENODEV; | |
1809 | if (port1 == 0 || port1 > hdev->maxchild) | |
1810 | return -EINVAL; | |
1811 | ||
41341261 | 1812 | /* Devices not managed by the hub driver |
7cbe5dca AS |
1813 | * will always have maxchild equal to 0. |
1814 | */ | |
41341261 | 1815 | *ppowner = &(hub->ports[port1 - 1]->port_owner); |
7cbe5dca AS |
1816 | return 0; |
1817 | } | |
1818 | ||
1819 | /* In the following three functions, the caller must hold hdev's lock */ | |
336c5c31 LT |
1820 | int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, |
1821 | struct dev_state *owner) | |
7cbe5dca AS |
1822 | { |
1823 | int rc; | |
336c5c31 | 1824 | struct dev_state **powner; |
7cbe5dca AS |
1825 | |
1826 | rc = find_port_owner(hdev, port1, &powner); | |
1827 | if (rc) | |
1828 | return rc; | |
1829 | if (*powner) | |
1830 | return -EBUSY; | |
1831 | *powner = owner; | |
1832 | return rc; | |
1833 | } | |
1834 | ||
336c5c31 LT |
1835 | int usb_hub_release_port(struct usb_device *hdev, unsigned port1, |
1836 | struct dev_state *owner) | |
7cbe5dca AS |
1837 | { |
1838 | int rc; | |
336c5c31 | 1839 | struct dev_state **powner; |
7cbe5dca AS |
1840 | |
1841 | rc = find_port_owner(hdev, port1, &powner); | |
1842 | if (rc) | |
1843 | return rc; | |
1844 | if (*powner != owner) | |
1845 | return -ENOENT; | |
1846 | *powner = NULL; | |
1847 | return rc; | |
1848 | } | |
1849 | ||
336c5c31 | 1850 | void usb_hub_release_all_ports(struct usb_device *hdev, struct dev_state *owner) |
7cbe5dca | 1851 | { |
ad493e5e | 1852 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
7cbe5dca | 1853 | int n; |
7cbe5dca | 1854 | |
fa2a9566 LT |
1855 | for (n = 0; n < hdev->maxchild; n++) { |
1856 | if (hub->ports[n]->port_owner == owner) | |
1857 | hub->ports[n]->port_owner = NULL; | |
7cbe5dca | 1858 | } |
fa2a9566 | 1859 | |
7cbe5dca AS |
1860 | } |
1861 | ||
1862 | /* The caller must hold udev's lock */ | |
1863 | bool usb_device_is_owned(struct usb_device *udev) | |
1864 | { | |
1865 | struct usb_hub *hub; | |
1866 | ||
1867 | if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) | |
1868 | return false; | |
ad493e5e | 1869 | hub = usb_hub_to_struct_hub(udev->parent); |
fa2a9566 | 1870 | return !!hub->ports[udev->portnum - 1]->port_owner; |
7cbe5dca AS |
1871 | } |
1872 | ||
1da177e4 LT |
1873 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1874 | { | |
ad493e5e | 1875 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
1da177e4 LT |
1876 | int i; |
1877 | ||
1878 | for (i = 0; i < udev->maxchild; ++i) { | |
ff823c79 LT |
1879 | if (hub->ports[i]->child) |
1880 | recursively_mark_NOTATTACHED(hub->ports[i]->child); | |
1da177e4 | 1881 | } |
9bbdf1e0 | 1882 | if (udev->state == USB_STATE_SUSPENDED) |
15123006 | 1883 | udev->active_duration -= jiffies; |
1da177e4 LT |
1884 | udev->state = USB_STATE_NOTATTACHED; |
1885 | } | |
1886 | ||
1887 | /** | |
1888 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1889 | * @udev: pointer to device whose state should be changed | |
1890 | * @new_state: new state value to be stored | |
1891 | * | |
1892 | * udev->state is _not_ fully protected by the device lock. Although | |
1893 | * most transitions are made only while holding the lock, the state can | |
1894 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1895 | * is so that devices can be marked as disconnected as soon as possible, | |
1896 | * without having to wait for any semaphores to be released. As a result, | |
1897 | * all changes to any device's state must be protected by the | |
1898 | * device_state_lock spinlock. | |
1899 | * | |
1900 | * Once a device has been added to the device tree, all changes to its state | |
1901 | * should be made using this routine. The state should _not_ be set directly. | |
1902 | * | |
1903 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1904 | * Otherwise udev->state is set to new_state, and if new_state is | |
1905 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1906 | * to USB_STATE_NOTATTACHED. | |
1907 | */ | |
1908 | void usb_set_device_state(struct usb_device *udev, | |
1909 | enum usb_device_state new_state) | |
1910 | { | |
1911 | unsigned long flags; | |
4681b171 | 1912 | int wakeup = -1; |
1da177e4 LT |
1913 | |
1914 | spin_lock_irqsave(&device_state_lock, flags); | |
1915 | if (udev->state == USB_STATE_NOTATTACHED) | |
1916 | ; /* do nothing */ | |
b94dc6b5 | 1917 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1918 | |
1919 | /* root hub wakeup capabilities are managed out-of-band | |
1920 | * and may involve silicon errata ... ignore them here. | |
1921 | */ | |
1922 | if (udev->parent) { | |
645daaab AS |
1923 | if (udev->state == USB_STATE_SUSPENDED |
1924 | || new_state == USB_STATE_SUSPENDED) | |
1925 | ; /* No change to wakeup settings */ | |
1926 | else if (new_state == USB_STATE_CONFIGURED) | |
4681b171 RW |
1927 | wakeup = udev->actconfig->desc.bmAttributes |
1928 | & USB_CONFIG_ATT_WAKEUP; | |
645daaab | 1929 | else |
4681b171 | 1930 | wakeup = 0; |
fb669cc0 | 1931 | } |
15123006 SS |
1932 | if (udev->state == USB_STATE_SUSPENDED && |
1933 | new_state != USB_STATE_SUSPENDED) | |
1934 | udev->active_duration -= jiffies; | |
1935 | else if (new_state == USB_STATE_SUSPENDED && | |
1936 | udev->state != USB_STATE_SUSPENDED) | |
1937 | udev->active_duration += jiffies; | |
645daaab | 1938 | udev->state = new_state; |
b94dc6b5 | 1939 | } else |
1da177e4 LT |
1940 | recursively_mark_NOTATTACHED(udev); |
1941 | spin_unlock_irqrestore(&device_state_lock, flags); | |
4681b171 RW |
1942 | if (wakeup >= 0) |
1943 | device_set_wakeup_capable(&udev->dev, wakeup); | |
1da177e4 | 1944 | } |
6da9c990 | 1945 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
1da177e4 | 1946 | |
8af548dc | 1947 | /* |
3b29b68b AS |
1948 | * Choose a device number. |
1949 | * | |
1950 | * Device numbers are used as filenames in usbfs. On USB-1.1 and | |
1951 | * USB-2.0 buses they are also used as device addresses, however on | |
1952 | * USB-3.0 buses the address is assigned by the controller hardware | |
1953 | * and it usually is not the same as the device number. | |
1954 | * | |
8af548dc IPG |
1955 | * WUSB devices are simple: they have no hubs behind, so the mapping |
1956 | * device <-> virtual port number becomes 1:1. Why? to simplify the | |
1957 | * life of the device connection logic in | |
1958 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret | |
1959 | * handshake we need to assign a temporary address in the unauthorized | |
1960 | * space. For simplicity we use the first virtual port number found to | |
1961 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] | |
1962 | * and that becomes it's address [X < 128] or its unauthorized address | |
1963 | * [X | 0x80]. | |
1964 | * | |
1965 | * We add 1 as an offset to the one-based USB-stack port number | |
1966 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr | |
1967 | * 0 is reserved by USB for default address; (b) Linux's USB stack | |
1968 | * uses always #1 for the root hub of the controller. So USB stack's | |
1969 | * port #1, which is wusb virtual-port #0 has address #2. | |
c6515272 SS |
1970 | * |
1971 | * Devices connected under xHCI are not as simple. The host controller | |
1972 | * supports virtualization, so the hardware assigns device addresses and | |
1973 | * the HCD must setup data structures before issuing a set address | |
1974 | * command to the hardware. | |
8af548dc | 1975 | */ |
3b29b68b | 1976 | static void choose_devnum(struct usb_device *udev) |
1da177e4 LT |
1977 | { |
1978 | int devnum; | |
1979 | struct usb_bus *bus = udev->bus; | |
1980 | ||
1981 | /* If khubd ever becomes multithreaded, this will need a lock */ | |
8af548dc IPG |
1982 | if (udev->wusb) { |
1983 | devnum = udev->portnum + 1; | |
1984 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); | |
1985 | } else { | |
1986 | /* Try to allocate the next devnum beginning at | |
1987 | * bus->devnum_next. */ | |
1988 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
1989 | bus->devnum_next); | |
1990 | if (devnum >= 128) | |
1991 | devnum = find_next_zero_bit(bus->devmap.devicemap, | |
1992 | 128, 1); | |
469271f8 | 1993 | bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); |
8af548dc | 1994 | } |
1da177e4 LT |
1995 | if (devnum < 128) { |
1996 | set_bit(devnum, bus->devmap.devicemap); | |
1997 | udev->devnum = devnum; | |
1998 | } | |
1999 | } | |
2000 | ||
3b29b68b | 2001 | static void release_devnum(struct usb_device *udev) |
1da177e4 LT |
2002 | { |
2003 | if (udev->devnum > 0) { | |
2004 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
2005 | udev->devnum = -1; | |
2006 | } | |
2007 | } | |
2008 | ||
3b29b68b | 2009 | static void update_devnum(struct usb_device *udev, int devnum) |
4953d141 DV |
2010 | { |
2011 | /* The address for a WUSB device is managed by wusbcore. */ | |
2012 | if (!udev->wusb) | |
2013 | udev->devnum = devnum; | |
2014 | } | |
2015 | ||
f7410ced HX |
2016 | static void hub_free_dev(struct usb_device *udev) |
2017 | { | |
2018 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2019 | ||
2020 | /* Root hubs aren't real devices, so don't free HCD resources */ | |
2021 | if (hcd->driver->free_dev && udev->parent) | |
2022 | hcd->driver->free_dev(hcd, udev); | |
2023 | } | |
2024 | ||
1da177e4 LT |
2025 | /** |
2026 | * usb_disconnect - disconnect a device (usbcore-internal) | |
2027 | * @pdev: pointer to device being disconnected | |
2028 | * Context: !in_interrupt () | |
2029 | * | |
2030 | * Something got disconnected. Get rid of it and all of its children. | |
2031 | * | |
2032 | * If *pdev is a normal device then the parent hub must already be locked. | |
db8f2aa3 BH |
2033 | * If *pdev is a root hub then the caller must hold the usb_bus_list_lock, |
2034 | * which protects the set of root hubs as well as the list of buses. | |
1da177e4 LT |
2035 | * |
2036 | * Only hub drivers (including virtual root hub drivers for host | |
2037 | * controllers) should ever call this. | |
2038 | * | |
2039 | * This call is synchronous, and may not be used in an interrupt context. | |
2040 | */ | |
2041 | void usb_disconnect(struct usb_device **pdev) | |
2042 | { | |
2043 | struct usb_device *udev = *pdev; | |
ad493e5e | 2044 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
1da177e4 LT |
2045 | int i; |
2046 | ||
1da177e4 LT |
2047 | /* mark the device as inactive, so any further urb submissions for |
2048 | * this device (and any of its children) will fail immediately. | |
25985edc | 2049 | * this quiesces everything except pending urbs. |
1da177e4 LT |
2050 | */ |
2051 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
3b29b68b AS |
2052 | dev_info(&udev->dev, "USB disconnect, device number %d\n", |
2053 | udev->devnum); | |
1da177e4 | 2054 | |
9ad3d6cc AS |
2055 | usb_lock_device(udev); |
2056 | ||
1da177e4 | 2057 | /* Free up all the children before we remove this device */ |
8816230e | 2058 | for (i = 0; i < udev->maxchild; i++) { |
ff823c79 LT |
2059 | if (hub->ports[i]->child) |
2060 | usb_disconnect(&hub->ports[i]->child); | |
1da177e4 LT |
2061 | } |
2062 | ||
2063 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
2064 | * cleaning up all state associated with the current configuration | |
2065 | * so that the hardware is now fully quiesced. | |
2066 | */ | |
782da727 | 2067 | dev_dbg (&udev->dev, "unregistering device\n"); |
1da177e4 | 2068 | usb_disable_device(udev, 0); |
cde217a5 | 2069 | usb_hcd_synchronize_unlinks(udev); |
1da177e4 | 2070 | |
fde26380 | 2071 | if (udev->parent) { |
ad493e5e LT |
2072 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
2073 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
fde26380 LT |
2074 | |
2075 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2076 | sysfs_remove_link(&port_dev->dev.kobj, "device"); | |
971fcd49 | 2077 | |
ad493e5e LT |
2078 | if (!port_dev->did_runtime_put) |
2079 | pm_runtime_put(&port_dev->dev); | |
2080 | else | |
2081 | port_dev->did_runtime_put = false; | |
fde26380 LT |
2082 | } |
2083 | ||
3b23dd6f | 2084 | usb_remove_ep_devs(&udev->ep0); |
782da727 AS |
2085 | usb_unlock_device(udev); |
2086 | ||
2087 | /* Unregister the device. The device driver is responsible | |
3b23dd6f AS |
2088 | * for de-configuring the device and invoking the remove-device |
2089 | * notifier chain (used by usbfs and possibly others). | |
782da727 AS |
2090 | */ |
2091 | device_del(&udev->dev); | |
3099e75a | 2092 | |
782da727 | 2093 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
2094 | * (or root_hub) pointer. |
2095 | */ | |
3b29b68b | 2096 | release_devnum(udev); |
1da177e4 LT |
2097 | |
2098 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
2099 | spin_lock_irq(&device_state_lock); | |
2100 | *pdev = NULL; | |
2101 | spin_unlock_irq(&device_state_lock); | |
2102 | ||
f7410ced HX |
2103 | hub_free_dev(udev); |
2104 | ||
782da727 | 2105 | put_device(&udev->dev); |
1da177e4 LT |
2106 | } |
2107 | ||
f2a383e4 | 2108 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
1da177e4 LT |
2109 | static void show_string(struct usb_device *udev, char *id, char *string) |
2110 | { | |
2111 | if (!string) | |
2112 | return; | |
f2ec522e | 2113 | dev_info(&udev->dev, "%s: %s\n", id, string); |
1da177e4 LT |
2114 | } |
2115 | ||
f2a383e4 GKH |
2116 | static void announce_device(struct usb_device *udev) |
2117 | { | |
2118 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", | |
2119 | le16_to_cpu(udev->descriptor.idVendor), | |
2120 | le16_to_cpu(udev->descriptor.idProduct)); | |
b9cef6c3 WF |
2121 | dev_info(&udev->dev, |
2122 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", | |
f2a383e4 GKH |
2123 | udev->descriptor.iManufacturer, |
2124 | udev->descriptor.iProduct, | |
2125 | udev->descriptor.iSerialNumber); | |
2126 | show_string(udev, "Product", udev->product); | |
2127 | show_string(udev, "Manufacturer", udev->manufacturer); | |
2128 | show_string(udev, "SerialNumber", udev->serial); | |
2129 | } | |
1da177e4 | 2130 | #else |
f2a383e4 | 2131 | static inline void announce_device(struct usb_device *udev) { } |
1da177e4 LT |
2132 | #endif |
2133 | ||
1da177e4 LT |
2134 | #ifdef CONFIG_USB_OTG |
2135 | #include "otg_whitelist.h" | |
2136 | #endif | |
2137 | ||
3ede760f | 2138 | /** |
8d8558d1 | 2139 | * usb_enumerate_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
2140 | * @udev: newly addressed device (in ADDRESS state) |
2141 | * | |
8d8558d1 | 2142 | * Finish enumeration for On-The-Go devices |
626f090c YB |
2143 | * |
2144 | * Return: 0 if successful. A negative error code otherwise. | |
3ede760f | 2145 | */ |
8d8558d1 | 2146 | static int usb_enumerate_device_otg(struct usb_device *udev) |
1da177e4 | 2147 | { |
d9d16e8a | 2148 | int err = 0; |
1da177e4 LT |
2149 | |
2150 | #ifdef CONFIG_USB_OTG | |
2151 | /* | |
2152 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
2153 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
2154 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
2155 | */ | |
2156 | if (!udev->bus->is_b_host | |
2157 | && udev->config | |
2158 | && udev->parent == udev->bus->root_hub) { | |
2eb5052e | 2159 | struct usb_otg_descriptor *desc = NULL; |
1da177e4 LT |
2160 | struct usb_bus *bus = udev->bus; |
2161 | ||
2162 | /* descriptor may appear anywhere in config */ | |
2163 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], | |
2164 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
2165 | USB_DT_OTG, (void **) &desc) == 0) { | |
2166 | if (desc->bmAttributes & USB_OTG_HNP) { | |
12c3da34 | 2167 | unsigned port1 = udev->portnum; |
fc849b85 | 2168 | |
1da177e4 LT |
2169 | dev_info(&udev->dev, |
2170 | "Dual-Role OTG device on %sHNP port\n", | |
2171 | (port1 == bus->otg_port) | |
2172 | ? "" : "non-"); | |
2173 | ||
2174 | /* enable HNP before suspend, it's simpler */ | |
2175 | if (port1 == bus->otg_port) | |
2176 | bus->b_hnp_enable = 1; | |
2177 | err = usb_control_msg(udev, | |
2178 | usb_sndctrlpipe(udev, 0), | |
2179 | USB_REQ_SET_FEATURE, 0, | |
2180 | bus->b_hnp_enable | |
2181 | ? USB_DEVICE_B_HNP_ENABLE | |
2182 | : USB_DEVICE_A_ALT_HNP_SUPPORT, | |
2183 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
2184 | if (err < 0) { | |
2185 | /* OTG MESSAGE: report errors here, | |
2186 | * customize to match your product. | |
2187 | */ | |
2188 | dev_info(&udev->dev, | |
b9cef6c3 | 2189 | "can't set HNP mode: %d\n", |
1da177e4 LT |
2190 | err); |
2191 | bus->b_hnp_enable = 0; | |
2192 | } | |
2193 | } | |
2194 | } | |
2195 | } | |
2196 | ||
2197 | if (!is_targeted(udev)) { | |
2198 | ||
2199 | /* Maybe it can talk to us, though we can't talk to it. | |
2200 | * (Includes HNP test device.) | |
2201 | */ | |
2202 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { | |
634a84f8 | 2203 | err = usb_port_suspend(udev, PMSG_SUSPEND); |
1da177e4 LT |
2204 | if (err < 0) |
2205 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
2206 | } | |
ffcdc18d | 2207 | err = -ENOTSUPP; |
1da177e4 LT |
2208 | goto fail; |
2209 | } | |
d9d16e8a | 2210 | fail: |
1da177e4 | 2211 | #endif |
d9d16e8a IPG |
2212 | return err; |
2213 | } | |
2214 | ||
2215 | ||
2216 | /** | |
8d8558d1 | 2217 | * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
d9d16e8a IPG |
2218 | * @udev: newly addressed device (in ADDRESS state) |
2219 | * | |
2220 | * This is only called by usb_new_device() and usb_authorize_device() | |
2221 | * and FIXME -- all comments that apply to them apply here wrt to | |
2222 | * environment. | |
2223 | * | |
2224 | * If the device is WUSB and not authorized, we don't attempt to read | |
2225 | * the string descriptors, as they will be errored out by the device | |
2226 | * until it has been authorized. | |
626f090c YB |
2227 | * |
2228 | * Return: 0 if successful. A negative error code otherwise. | |
d9d16e8a | 2229 | */ |
8d8558d1 | 2230 | static int usb_enumerate_device(struct usb_device *udev) |
d9d16e8a IPG |
2231 | { |
2232 | int err; | |
1da177e4 | 2233 | |
d9d16e8a IPG |
2234 | if (udev->config == NULL) { |
2235 | err = usb_get_configuration(udev); | |
2236 | if (err < 0) { | |
e9e88fb7 AS |
2237 | if (err != -ENODEV) |
2238 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
2239 | err); | |
80da2e0d | 2240 | return err; |
d9d16e8a IPG |
2241 | } |
2242 | } | |
83e83ecb TP |
2243 | |
2244 | /* read the standard strings and cache them if present */ | |
2245 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
2246 | udev->manufacturer = usb_cache_string(udev, | |
2247 | udev->descriptor.iManufacturer); | |
2248 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
2249 | ||
8d8558d1 | 2250 | err = usb_enumerate_device_otg(udev); |
80da2e0d LP |
2251 | if (err < 0) |
2252 | return err; | |
2253 | ||
2254 | usb_detect_interface_quirks(udev); | |
2255 | ||
2256 | return 0; | |
d9d16e8a IPG |
2257 | } |
2258 | ||
d35e70d5 MG |
2259 | static void set_usb_port_removable(struct usb_device *udev) |
2260 | { | |
2261 | struct usb_device *hdev = udev->parent; | |
2262 | struct usb_hub *hub; | |
2263 | u8 port = udev->portnum; | |
2264 | u16 wHubCharacteristics; | |
2265 | bool removable = true; | |
2266 | ||
2267 | if (!hdev) | |
2268 | return; | |
2269 | ||
ad493e5e | 2270 | hub = usb_hub_to_struct_hub(udev->parent); |
d35e70d5 MG |
2271 | |
2272 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
2273 | ||
2274 | if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) | |
2275 | return; | |
2276 | ||
2277 | if (hub_is_superspeed(hdev)) { | |
ca3c1539 LT |
2278 | if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) |
2279 | & (1 << port)) | |
d35e70d5 MG |
2280 | removable = false; |
2281 | } else { | |
2282 | if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) | |
2283 | removable = false; | |
2284 | } | |
2285 | ||
2286 | if (removable) | |
2287 | udev->removable = USB_DEVICE_REMOVABLE; | |
2288 | else | |
2289 | udev->removable = USB_DEVICE_FIXED; | |
2290 | } | |
d9d16e8a IPG |
2291 | |
2292 | /** | |
2293 | * usb_new_device - perform initial device setup (usbcore-internal) | |
2294 | * @udev: newly addressed device (in ADDRESS state) | |
2295 | * | |
8d8558d1 AS |
2296 | * This is called with devices which have been detected but not fully |
2297 | * enumerated. The device descriptor is available, but not descriptors | |
d9d16e8a IPG |
2298 | * for any device configuration. The caller must have locked either |
2299 | * the parent hub (if udev is a normal device) or else the | |
2300 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to | |
2301 | * udev has already been installed, but udev is not yet visible through | |
2302 | * sysfs or other filesystem code. | |
2303 | * | |
d9d16e8a IPG |
2304 | * This call is synchronous, and may not be used in an interrupt context. |
2305 | * | |
2306 | * Only the hub driver or root-hub registrar should ever call this. | |
626f090c YB |
2307 | * |
2308 | * Return: Whether the device is configured properly or not. Zero if the | |
2309 | * interface was registered with the driver core; else a negative errno | |
2310 | * value. | |
2311 | * | |
d9d16e8a IPG |
2312 | */ |
2313 | int usb_new_device(struct usb_device *udev) | |
2314 | { | |
2315 | int err; | |
2316 | ||
16985408 | 2317 | if (udev->parent) { |
16985408 DS |
2318 | /* Initialize non-root-hub device wakeup to disabled; |
2319 | * device (un)configuration controls wakeup capable | |
2320 | * sysfs power/wakeup controls wakeup enabled/disabled | |
2321 | */ | |
2322 | device_init_wakeup(&udev->dev, 0); | |
16985408 DS |
2323 | } |
2324 | ||
9bbdf1e0 AS |
2325 | /* Tell the runtime-PM framework the device is active */ |
2326 | pm_runtime_set_active(&udev->dev); | |
c08512c7 | 2327 | pm_runtime_get_noresume(&udev->dev); |
fcc4a01e | 2328 | pm_runtime_use_autosuspend(&udev->dev); |
9bbdf1e0 AS |
2329 | pm_runtime_enable(&udev->dev); |
2330 | ||
c08512c7 AS |
2331 | /* By default, forbid autosuspend for all devices. It will be |
2332 | * allowed for hubs during binding. | |
2333 | */ | |
2334 | usb_disable_autosuspend(udev); | |
2335 | ||
8d8558d1 | 2336 | err = usb_enumerate_device(udev); /* Read descriptors */ |
d9d16e8a IPG |
2337 | if (err < 0) |
2338 | goto fail; | |
c6515272 SS |
2339 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
2340 | udev->devnum, udev->bus->busnum, | |
2341 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
9f8b17e6 KS |
2342 | /* export the usbdev device-node for libusb */ |
2343 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
2344 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
2345 | ||
6cd13201 AS |
2346 | /* Tell the world! */ |
2347 | announce_device(udev); | |
195af2cc | 2348 | |
b04b3156 TT |
2349 | if (udev->serial) |
2350 | add_device_randomness(udev->serial, strlen(udev->serial)); | |
2351 | if (udev->product) | |
2352 | add_device_randomness(udev->product, strlen(udev->product)); | |
2353 | if (udev->manufacturer) | |
2354 | add_device_randomness(udev->manufacturer, | |
2355 | strlen(udev->manufacturer)); | |
2356 | ||
927bc916 | 2357 | device_enable_async_suspend(&udev->dev); |
d35e70d5 MG |
2358 | |
2359 | /* | |
2360 | * check whether the hub marks this port as non-removable. Do it | |
2361 | * now so that platform-specific data can override it in | |
2362 | * device_add() | |
2363 | */ | |
2364 | if (udev->parent) | |
2365 | set_usb_port_removable(udev); | |
2366 | ||
782da727 | 2367 | /* Register the device. The device driver is responsible |
3b23dd6f AS |
2368 | * for configuring the device and invoking the add-device |
2369 | * notifier chain (used by usbfs and possibly others). | |
782da727 | 2370 | */ |
9f8b17e6 | 2371 | err = device_add(&udev->dev); |
1da177e4 LT |
2372 | if (err) { |
2373 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
2374 | goto fail; | |
2375 | } | |
9ad3d6cc | 2376 | |
fde26380 LT |
2377 | /* Create link files between child device and usb port device. */ |
2378 | if (udev->parent) { | |
ad493e5e LT |
2379 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
2380 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
fde26380 LT |
2381 | |
2382 | err = sysfs_create_link(&udev->dev.kobj, | |
2383 | &port_dev->dev.kobj, "port"); | |
2384 | if (err) | |
2385 | goto fail; | |
2386 | ||
2387 | err = sysfs_create_link(&port_dev->dev.kobj, | |
2388 | &udev->dev.kobj, "device"); | |
2389 | if (err) { | |
2390 | sysfs_remove_link(&udev->dev.kobj, "port"); | |
2391 | goto fail; | |
2392 | } | |
971fcd49 LT |
2393 | |
2394 | pm_runtime_get_sync(&port_dev->dev); | |
fde26380 LT |
2395 | } |
2396 | ||
3b23dd6f | 2397 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
c08512c7 AS |
2398 | usb_mark_last_busy(udev); |
2399 | pm_runtime_put_sync_autosuspend(&udev->dev); | |
c066475e | 2400 | return err; |
1da177e4 LT |
2401 | |
2402 | fail: | |
2403 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
9bbdf1e0 AS |
2404 | pm_runtime_disable(&udev->dev); |
2405 | pm_runtime_set_suspended(&udev->dev); | |
d9d16e8a | 2406 | return err; |
1da177e4 LT |
2407 | } |
2408 | ||
93993a0a IPG |
2409 | |
2410 | /** | |
fd39c86b RD |
2411 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
2412 | * @usb_dev: USB device | |
2413 | * | |
2414 | * Move the USB device to a very basic state where interfaces are disabled | |
2415 | * and the device is in fact unconfigured and unusable. | |
93993a0a IPG |
2416 | * |
2417 | * We share a lock (that we have) with device_del(), so we need to | |
2418 | * defer its call. | |
626f090c YB |
2419 | * |
2420 | * Return: 0. | |
93993a0a IPG |
2421 | */ |
2422 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
2423 | { | |
93993a0a IPG |
2424 | usb_lock_device(usb_dev); |
2425 | if (usb_dev->authorized == 0) | |
2426 | goto out_unauthorized; | |
da307123 | 2427 | |
93993a0a IPG |
2428 | usb_dev->authorized = 0; |
2429 | usb_set_configuration(usb_dev, -1); | |
da307123 | 2430 | |
93993a0a IPG |
2431 | out_unauthorized: |
2432 | usb_unlock_device(usb_dev); | |
2433 | return 0; | |
2434 | } | |
2435 | ||
2436 | ||
2437 | int usb_authorize_device(struct usb_device *usb_dev) | |
2438 | { | |
2439 | int result = 0, c; | |
da307123 | 2440 | |
93993a0a IPG |
2441 | usb_lock_device(usb_dev); |
2442 | if (usb_dev->authorized == 1) | |
2443 | goto out_authorized; | |
da307123 | 2444 | |
93993a0a IPG |
2445 | result = usb_autoresume_device(usb_dev); |
2446 | if (result < 0) { | |
2447 | dev_err(&usb_dev->dev, | |
2448 | "can't autoresume for authorization: %d\n", result); | |
2449 | goto error_autoresume; | |
2450 | } | |
2451 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
2452 | if (result < 0) { | |
2453 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
2454 | "authorization: %d\n", result); | |
2455 | goto error_device_descriptor; | |
2456 | } | |
da307123 | 2457 | |
93993a0a | 2458 | usb_dev->authorized = 1; |
93993a0a IPG |
2459 | /* Choose and set the configuration. This registers the interfaces |
2460 | * with the driver core and lets interface drivers bind to them. | |
2461 | */ | |
b5ea060f | 2462 | c = usb_choose_configuration(usb_dev); |
93993a0a IPG |
2463 | if (c >= 0) { |
2464 | result = usb_set_configuration(usb_dev, c); | |
2465 | if (result) { | |
2466 | dev_err(&usb_dev->dev, | |
2467 | "can't set config #%d, error %d\n", c, result); | |
2468 | /* This need not be fatal. The user can try to | |
2469 | * set other configurations. */ | |
2470 | } | |
2471 | } | |
2472 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
da307123 | 2473 | |
93993a0a | 2474 | error_device_descriptor: |
da307123 | 2475 | usb_autosuspend_device(usb_dev); |
93993a0a IPG |
2476 | error_autoresume: |
2477 | out_authorized: | |
781b2137 | 2478 | usb_unlock_device(usb_dev); /* complements locktree */ |
93993a0a IPG |
2479 | return result; |
2480 | } | |
2481 | ||
2482 | ||
0165de09 IPG |
2483 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
2484 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
2485 | { | |
2486 | struct usb_hcd *hcd; | |
2487 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
2488 | return 0; | |
2489 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); | |
2490 | return hcd->wireless; | |
2491 | } | |
2492 | ||
2493 | ||
1da177e4 LT |
2494 | #define PORT_RESET_TRIES 5 |
2495 | #define SET_ADDRESS_TRIES 2 | |
2496 | #define GET_DESCRIPTOR_TRIES 2 | |
2497 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
90ab5ee9 | 2498 | #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) |
1da177e4 LT |
2499 | |
2500 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
2501 | #define HUB_SHORT_RESET_TIME 10 | |
75d7cf72 | 2502 | #define HUB_BH_RESET_TIME 50 |
1da177e4 | 2503 | #define HUB_LONG_RESET_TIME 200 |
77c7f072 | 2504 | #define HUB_RESET_TIMEOUT 800 |
1da177e4 | 2505 | |
48fc7dbd DW |
2506 | /* |
2507 | * "New scheme" enumeration causes an extra state transition to be | |
2508 | * exposed to an xhci host and causes USB3 devices to receive control | |
2509 | * commands in the default state. This has been seen to cause | |
2510 | * enumeration failures, so disable this enumeration scheme for USB3 | |
2511 | * devices. | |
2512 | */ | |
2513 | static bool use_new_scheme(struct usb_device *udev, int retry) | |
2514 | { | |
2515 | if (udev->speed == USB_SPEED_SUPER) | |
2516 | return false; | |
2517 | ||
2518 | return USE_NEW_SCHEME(retry); | |
2519 | } | |
2520 | ||
10d674a8 SS |
2521 | static int hub_port_reset(struct usb_hub *hub, int port1, |
2522 | struct usb_device *udev, unsigned int delay, bool warm); | |
2523 | ||
025d4430 | 2524 | /* Is a USB 3.0 port in the Inactive or Compliance Mode state? |
8bea2bd3 SL |
2525 | * Port worm reset is required to recover |
2526 | */ | |
2527 | static bool hub_port_warm_reset_required(struct usb_hub *hub, u16 portstatus) | |
10d674a8 SS |
2528 | { |
2529 | return hub_is_superspeed(hub->hdev) && | |
8bea2bd3 SL |
2530 | (((portstatus & USB_PORT_STAT_LINK_STATE) == |
2531 | USB_SS_PORT_LS_SS_INACTIVE) || | |
2532 | ((portstatus & USB_PORT_STAT_LINK_STATE) == | |
2533 | USB_SS_PORT_LS_COMP_MOD)) ; | |
10d674a8 SS |
2534 | } |
2535 | ||
1da177e4 | 2536 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2537 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2538 | { |
2539 | int delay_time, ret; | |
2540 | u16 portstatus; | |
2541 | u16 portchange; | |
2542 | ||
2543 | for (delay_time = 0; | |
2544 | delay_time < HUB_RESET_TIMEOUT; | |
2545 | delay_time += delay) { | |
2546 | /* wait to give the device a chance to reset */ | |
2547 | msleep(delay); | |
2548 | ||
2549 | /* read and decode port status */ | |
2550 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2551 | if (ret < 0) | |
2552 | return ret; | |
2553 | ||
4f43447e | 2554 | /* The port state is unknown until the reset completes. */ |
470f0be8 SS |
2555 | if (!(portstatus & USB_PORT_STAT_RESET)) |
2556 | break; | |
1da177e4 LT |
2557 | |
2558 | /* switch to the long delay after two short delay failures */ | |
2559 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
2560 | delay = HUB_LONG_RESET_TIME; | |
2561 | ||
2562 | dev_dbg (hub->intfdev, | |
75d7cf72 AX |
2563 | "port %d not %sreset yet, waiting %dms\n", |
2564 | port1, warm ? "warm " : "", delay); | |
1da177e4 LT |
2565 | } |
2566 | ||
470f0be8 SS |
2567 | if ((portstatus & USB_PORT_STAT_RESET)) |
2568 | return -EBUSY; | |
2569 | ||
2570 | if (hub_port_warm_reset_required(hub, portstatus)) | |
2571 | return -ENOTCONN; | |
2572 | ||
2573 | /* Device went away? */ | |
2574 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
2575 | return -ENOTCONN; | |
2576 | ||
2577 | /* bomb out completely if the connection bounced. A USB 3.0 | |
2578 | * connection may bounce if multiple warm resets were issued, | |
2579 | * but the device may have successfully re-connected. Ignore it. | |
2580 | */ | |
2581 | if (!hub_is_superspeed(hub->hdev) && | |
2582 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
2583 | return -ENOTCONN; | |
2584 | ||
2585 | if (!(portstatus & USB_PORT_STAT_ENABLE)) | |
2586 | return -EBUSY; | |
2587 | ||
2588 | if (!udev) | |
2589 | return 0; | |
2590 | ||
2591 | if (hub_is_wusb(hub)) | |
2592 | udev->speed = USB_SPEED_WIRELESS; | |
2593 | else if (hub_is_superspeed(hub->hdev)) | |
2594 | udev->speed = USB_SPEED_SUPER; | |
2595 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
2596 | udev->speed = USB_SPEED_HIGH; | |
2597 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
2598 | udev->speed = USB_SPEED_LOW; | |
2599 | else | |
2600 | udev->speed = USB_SPEED_FULL; | |
2601 | return 0; | |
1da177e4 LT |
2602 | } |
2603 | ||
75d7cf72 | 2604 | static void hub_port_finish_reset(struct usb_hub *hub, int port1, |
a24a6078 | 2605 | struct usb_device *udev, int *status) |
75d7cf72 AX |
2606 | { |
2607 | switch (*status) { | |
2608 | case 0: | |
a24a6078 SS |
2609 | /* TRSTRCY = 10 ms; plus some extra */ |
2610 | msleep(10 + 40); | |
2611 | if (udev) { | |
2612 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2613 | ||
2614 | update_devnum(udev, 0); | |
2615 | /* The xHC may think the device is already reset, | |
2616 | * so ignore the status. | |
2617 | */ | |
2618 | if (hcd->driver->reset_device) | |
2619 | hcd->driver->reset_device(hcd, udev); | |
75d7cf72 AX |
2620 | } |
2621 | /* FALL THROUGH */ | |
2622 | case -ENOTCONN: | |
2623 | case -ENODEV: | |
ad493e5e | 2624 | usb_clear_port_feature(hub->hdev, |
75d7cf72 | 2625 | port1, USB_PORT_FEAT_C_RESET); |
1c7439c6 | 2626 | if (hub_is_superspeed(hub->hdev)) { |
ad493e5e | 2627 | usb_clear_port_feature(hub->hdev, port1, |
75d7cf72 | 2628 | USB_PORT_FEAT_C_BH_PORT_RESET); |
ad493e5e | 2629 | usb_clear_port_feature(hub->hdev, port1, |
75d7cf72 | 2630 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
ad493e5e | 2631 | usb_clear_port_feature(hub->hdev, port1, |
a24a6078 | 2632 | USB_PORT_FEAT_C_CONNECTION); |
1c7439c6 | 2633 | } |
a24a6078 | 2634 | if (udev) |
75d7cf72 AX |
2635 | usb_set_device_state(udev, *status |
2636 | ? USB_STATE_NOTATTACHED | |
2637 | : USB_STATE_DEFAULT); | |
75d7cf72 AX |
2638 | break; |
2639 | } | |
2640 | } | |
2641 | ||
2642 | /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ | |
1da177e4 | 2643 | static int hub_port_reset(struct usb_hub *hub, int port1, |
75d7cf72 | 2644 | struct usb_device *udev, unsigned int delay, bool warm) |
1da177e4 LT |
2645 | { |
2646 | int i, status; | |
a24a6078 | 2647 | u16 portchange, portstatus; |
1da177e4 | 2648 | |
0fe51aa5 SS |
2649 | if (!hub_is_superspeed(hub->hdev)) { |
2650 | if (warm) { | |
75d7cf72 AX |
2651 | dev_err(hub->intfdev, "only USB3 hub support " |
2652 | "warm reset\n"); | |
2653 | return -EINVAL; | |
2654 | } | |
0fe51aa5 SS |
2655 | /* Block EHCI CF initialization during the port reset. |
2656 | * Some companion controllers don't like it when they mix. | |
2657 | */ | |
2658 | down_read(&ehci_cf_port_reset_rwsem); | |
d3b9d7a9 SS |
2659 | } else if (!warm) { |
2660 | /* | |
2661 | * If the caller hasn't explicitly requested a warm reset, | |
2662 | * double check and see if one is needed. | |
2663 | */ | |
2664 | status = hub_port_status(hub, port1, | |
2665 | &portstatus, &portchange); | |
2666 | if (status < 0) | |
2667 | goto done; | |
2668 | ||
2669 | if (hub_port_warm_reset_required(hub, portstatus)) | |
2670 | warm = true; | |
75d7cf72 | 2671 | } |
32fe0198 | 2672 | |
1da177e4 LT |
2673 | /* Reset the port */ |
2674 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
75d7cf72 AX |
2675 | status = set_port_feature(hub->hdev, port1, (warm ? |
2676 | USB_PORT_FEAT_BH_PORT_RESET : | |
2677 | USB_PORT_FEAT_RESET)); | |
e9e88fb7 AS |
2678 | if (status == -ENODEV) { |
2679 | ; /* The hub is gone */ | |
2680 | } else if (status) { | |
1da177e4 | 2681 | dev_err(hub->intfdev, |
75d7cf72 AX |
2682 | "cannot %sreset port %d (err = %d)\n", |
2683 | warm ? "warm " : "", port1, status); | |
2684 | } else { | |
2685 | status = hub_port_wait_reset(hub, port1, udev, delay, | |
2686 | warm); | |
e9e88fb7 | 2687 | if (status && status != -ENOTCONN && status != -ENODEV) |
1da177e4 LT |
2688 | dev_dbg(hub->intfdev, |
2689 | "port_wait_reset: err = %d\n", | |
2690 | status); | |
2691 | } | |
2692 | ||
a24a6078 | 2693 | /* Check for disconnect or reset */ |
75d7cf72 | 2694 | if (status == 0 || status == -ENOTCONN || status == -ENODEV) { |
a24a6078 SS |
2695 | hub_port_finish_reset(hub, port1, udev, &status); |
2696 | ||
2697 | if (!hub_is_superspeed(hub->hdev)) | |
2698 | goto done; | |
2699 | ||
2700 | /* | |
2701 | * If a USB 3.0 device migrates from reset to an error | |
2702 | * state, re-issue the warm reset. | |
2703 | */ | |
2704 | if (hub_port_status(hub, port1, | |
2705 | &portstatus, &portchange) < 0) | |
2706 | goto done; | |
2707 | ||
2708 | if (!hub_port_warm_reset_required(hub, portstatus)) | |
2709 | goto done; | |
2710 | ||
2711 | /* | |
2712 | * If the port is in SS.Inactive or Compliance Mode, the | |
2713 | * hot or warm reset failed. Try another warm reset. | |
2714 | */ | |
2715 | if (!warm) { | |
2716 | dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n", | |
2717 | port1); | |
2718 | warm = true; | |
2719 | } | |
1da177e4 LT |
2720 | } |
2721 | ||
2722 | dev_dbg (hub->intfdev, | |
75d7cf72 AX |
2723 | "port %d not enabled, trying %sreset again...\n", |
2724 | port1, warm ? "warm " : ""); | |
1da177e4 LT |
2725 | delay = HUB_LONG_RESET_TIME; |
2726 | } | |
2727 | ||
2728 | dev_err (hub->intfdev, | |
2729 | "Cannot enable port %i. Maybe the USB cable is bad?\n", | |
2730 | port1); | |
2731 | ||
75d7cf72 | 2732 | done: |
0fe51aa5 | 2733 | if (!hub_is_superspeed(hub->hdev)) |
75d7cf72 | 2734 | up_read(&ehci_cf_port_reset_rwsem); |
5e467f6e | 2735 | |
75d7cf72 | 2736 | return status; |
5e467f6e AX |
2737 | } |
2738 | ||
0ed9a57e AX |
2739 | /* Check if a port is power on */ |
2740 | static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) | |
2741 | { | |
2742 | int ret = 0; | |
2743 | ||
2744 | if (hub_is_superspeed(hub->hdev)) { | |
2745 | if (portstatus & USB_SS_PORT_STAT_POWER) | |
2746 | ret = 1; | |
2747 | } else { | |
2748 | if (portstatus & USB_PORT_STAT_POWER) | |
2749 | ret = 1; | |
2750 | } | |
2751 | ||
2752 | return ret; | |
2753 | } | |
2754 | ||
d388dab7 | 2755 | #ifdef CONFIG_PM |
1da177e4 | 2756 | |
0ed9a57e AX |
2757 | /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ |
2758 | static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) | |
2759 | { | |
2760 | int ret = 0; | |
2761 | ||
2762 | if (hub_is_superspeed(hub->hdev)) { | |
2763 | if ((portstatus & USB_PORT_STAT_LINK_STATE) | |
2764 | == USB_SS_PORT_LS_U3) | |
2765 | ret = 1; | |
2766 | } else { | |
2767 | if (portstatus & USB_PORT_STAT_SUSPEND) | |
2768 | ret = 1; | |
2769 | } | |
2770 | ||
2771 | return ret; | |
2772 | } | |
b01b03f3 AS |
2773 | |
2774 | /* Determine whether the device on a port is ready for a normal resume, | |
2775 | * is ready for a reset-resume, or should be disconnected. | |
2776 | */ | |
2777 | static int check_port_resume_type(struct usb_device *udev, | |
2778 | struct usb_hub *hub, int port1, | |
2779 | int status, unsigned portchange, unsigned portstatus) | |
2780 | { | |
2781 | /* Is the device still present? */ | |
0ed9a57e AX |
2782 | if (status || port_is_suspended(hub, portstatus) || |
2783 | !port_is_power_on(hub, portstatus) || | |
2784 | !(portstatus & USB_PORT_STAT_CONNECTION)) { | |
b01b03f3 AS |
2785 | if (status >= 0) |
2786 | status = -ENODEV; | |
2787 | } | |
2788 | ||
86c57edf AS |
2789 | /* Can't do a normal resume if the port isn't enabled, |
2790 | * so try a reset-resume instead. | |
2791 | */ | |
2792 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { | |
2793 | if (udev->persist_enabled) | |
2794 | udev->reset_resume = 1; | |
2795 | else | |
2796 | status = -ENODEV; | |
2797 | } | |
b01b03f3 AS |
2798 | |
2799 | if (status) { | |
2800 | dev_dbg(hub->intfdev, | |
2801 | "port %d status %04x.%04x after resume, %d\n", | |
2802 | port1, portchange, portstatus, status); | |
2803 | } else if (udev->reset_resume) { | |
2804 | ||
2805 | /* Late port handoff can set status-change bits */ | |
2806 | if (portchange & USB_PORT_STAT_C_CONNECTION) | |
ad493e5e | 2807 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
2808 | USB_PORT_FEAT_C_CONNECTION); |
2809 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
ad493e5e | 2810 | usb_clear_port_feature(hub->hdev, port1, |
b01b03f3 AS |
2811 | USB_PORT_FEAT_C_ENABLE); |
2812 | } | |
2813 | ||
2814 | return status; | |
2815 | } | |
2816 | ||
f74631e3 SS |
2817 | int usb_disable_ltm(struct usb_device *udev) |
2818 | { | |
2819 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2820 | ||
2821 | /* Check if the roothub and device supports LTM. */ | |
2822 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
2823 | !usb_device_supports_ltm(udev)) | |
2824 | return 0; | |
2825 | ||
2826 | /* Clear Feature LTM Enable can only be sent if the device is | |
2827 | * configured. | |
2828 | */ | |
2829 | if (!udev->actconfig) | |
2830 | return 0; | |
2831 | ||
2832 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2833 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
2834 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
2835 | USB_CTRL_SET_TIMEOUT); | |
2836 | } | |
2837 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
2838 | ||
2839 | void usb_enable_ltm(struct usb_device *udev) | |
2840 | { | |
2841 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
2842 | ||
2843 | /* Check if the roothub and device supports LTM. */ | |
2844 | if (!usb_device_supports_ltm(hcd->self.root_hub) || | |
2845 | !usb_device_supports_ltm(udev)) | |
2846 | return; | |
2847 | ||
2848 | /* Set Feature LTM Enable can only be sent if the device is | |
2849 | * configured. | |
2850 | */ | |
2851 | if (!udev->actconfig) | |
2852 | return; | |
2853 | ||
2854 | usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2855 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
2856 | USB_DEVICE_LTM_ENABLE, 0, NULL, 0, | |
2857 | USB_CTRL_SET_TIMEOUT); | |
2858 | } | |
2859 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
2860 | ||
54a3ac0c | 2861 | /* |
28e86165 | 2862 | * usb_enable_remote_wakeup - enable remote wakeup for a device |
54a3ac0c LT |
2863 | * @udev: target device |
2864 | * | |
28e86165 AS |
2865 | * For USB-2 devices: Set the device's remote wakeup feature. |
2866 | * | |
2867 | * For USB-3 devices: Assume there's only one function on the device and | |
2868 | * enable remote wake for the first interface. FIXME if the interface | |
2869 | * association descriptor shows there's more than one function. | |
54a3ac0c | 2870 | */ |
28e86165 | 2871 | static int usb_enable_remote_wakeup(struct usb_device *udev) |
54a3ac0c | 2872 | { |
28e86165 AS |
2873 | if (udev->speed < USB_SPEED_SUPER) |
2874 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2875 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
2876 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, | |
2877 | USB_CTRL_SET_TIMEOUT); | |
2878 | else | |
2879 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2880 | USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, | |
2881 | USB_INTRF_FUNC_SUSPEND, | |
2882 | USB_INTRF_FUNC_SUSPEND_RW | | |
2883 | USB_INTRF_FUNC_SUSPEND_LP, | |
2884 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
2885 | } | |
2886 | ||
2887 | /* | |
2888 | * usb_disable_remote_wakeup - disable remote wakeup for a device | |
2889 | * @udev: target device | |
2890 | * | |
2891 | * For USB-2 devices: Clear the device's remote wakeup feature. | |
2892 | * | |
2893 | * For USB-3 devices: Assume there's only one function on the device and | |
2894 | * disable remote wake for the first interface. FIXME if the interface | |
2895 | * association descriptor shows there's more than one function. | |
2896 | */ | |
2897 | static int usb_disable_remote_wakeup(struct usb_device *udev) | |
2898 | { | |
2899 | if (udev->speed < USB_SPEED_SUPER) | |
2900 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2901 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
2902 | USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, | |
2903 | USB_CTRL_SET_TIMEOUT); | |
2904 | else | |
2905 | return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
54a3ac0c LT |
2906 | USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, |
2907 | USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, | |
2908 | USB_CTRL_SET_TIMEOUT); | |
2909 | } | |
1da177e4 | 2910 | |
e583d9db AS |
2911 | /* Count of wakeup-enabled devices at or below udev */ |
2912 | static unsigned wakeup_enabled_descendants(struct usb_device *udev) | |
2913 | { | |
2914 | struct usb_hub *hub = usb_hub_to_struct_hub(udev); | |
2915 | ||
2916 | return udev->do_remote_wakeup + | |
2917 | (hub ? hub->wakeup_enabled_descendants : 0); | |
2918 | } | |
2919 | ||
1da177e4 | 2920 | /* |
624d6c07 AS |
2921 | * usb_port_suspend - suspend a usb device's upstream port |
2922 | * @udev: device that's no longer in active use, not a root hub | |
2923 | * Context: must be able to sleep; device not locked; pm locks held | |
2924 | * | |
2925 | * Suspends a USB device that isn't in active use, conserving power. | |
2926 | * Devices may wake out of a suspend, if anything important happens, | |
2927 | * using the remote wakeup mechanism. They may also be taken out of | |
2928 | * suspend by the host, using usb_port_resume(). It's also routine | |
2929 | * to disconnect devices while they are suspended. | |
2930 | * | |
2931 | * This only affects the USB hardware for a device; its interfaces | |
2932 | * (and, for hubs, child devices) must already have been suspended. | |
2933 | * | |
1da177e4 LT |
2934 | * Selective port suspend reduces power; most suspended devices draw |
2935 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
2936 | * All devices below the suspended port are also suspended. | |
2937 | * | |
2938 | * Devices leave suspend state when the host wakes them up. Some devices | |
2939 | * also support "remote wakeup", where the device can activate the USB | |
2940 | * tree above them to deliver data, such as a keypress or packet. In | |
2941 | * some cases, this wakes the USB host. | |
624d6c07 AS |
2942 | * |
2943 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
2944 | * between a pair of dual-role devices. That will change roles, such | |
2945 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
2946 | * | |
2947 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
2948 | * to ACPI D2, "may cause the device to lose some context". | |
2949 | * State transitions include: | |
2950 | * | |
2951 | * - suspend, resume ... when the VBUS power link stays live | |
2952 | * - suspend, disconnect ... VBUS lost | |
2953 | * | |
2954 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
2955 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
2956 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
2957 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd | |
2958 | * timer, no SRP, no requests through sysfs. | |
2959 | * | |
e583d9db AS |
2960 | * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get |
2961 | * suspended until their bus goes into global suspend (i.e., the root | |
0aa2832d AS |
2962 | * hub is suspended). Nevertheless, we change @udev->state to |
2963 | * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual | |
2964 | * upstream port setting is stored in @udev->port_is_suspended. | |
624d6c07 AS |
2965 | * |
2966 | * Returns 0 on success, else negative errno. | |
1da177e4 | 2967 | */ |
65bfd296 | 2968 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 2969 | { |
ad493e5e LT |
2970 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
2971 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
2972 | int port1 = udev->portnum; |
2973 | int status; | |
0aa2832d | 2974 | bool really_suspend = true; |
1da177e4 | 2975 | |
1da177e4 LT |
2976 | /* enable remote wakeup when appropriate; this lets the device |
2977 | * wake up the upstream hub (including maybe the root hub). | |
2978 | * | |
2979 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
2980 | * we don't explicitly enable it here. | |
2981 | */ | |
645daaab | 2982 | if (udev->do_remote_wakeup) { |
28e86165 | 2983 | status = usb_enable_remote_wakeup(udev); |
0c487206 | 2984 | if (status) { |
624d6c07 AS |
2985 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
2986 | status); | |
0c487206 | 2987 | /* bail if autosuspend is requested */ |
5b1b0b81 | 2988 | if (PMSG_IS_AUTO(msg)) |
4fae6f0f | 2989 | goto err_wakeup; |
0c487206 | 2990 | } |
1da177e4 LT |
2991 | } |
2992 | ||
65580b43 AX |
2993 | /* disable USB2 hardware LPM */ |
2994 | if (udev->usb2_hw_lpm_enabled == 1) | |
2995 | usb_set_usb2_hardware_lpm(udev, 0); | |
2996 | ||
f74631e3 | 2997 | if (usb_disable_ltm(udev)) { |
4fae6f0f AS |
2998 | dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); |
2999 | status = -ENOMEM; | |
3000 | if (PMSG_IS_AUTO(msg)) | |
3001 | goto err_ltm; | |
f74631e3 | 3002 | } |
8306095f | 3003 | if (usb_unlocked_disable_lpm(udev)) { |
4fae6f0f AS |
3004 | dev_err(&udev->dev, "Failed to disable LPM before suspend\n."); |
3005 | status = -ENOMEM; | |
3006 | if (PMSG_IS_AUTO(msg)) | |
3007 | goto err_lpm3; | |
8306095f SS |
3008 | } |
3009 | ||
1da177e4 | 3010 | /* see 7.1.7.6 */ |
a7114230 | 3011 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 3012 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); |
e583d9db | 3013 | |
0aa2832d AS |
3014 | /* |
3015 | * For system suspend, we do not need to enable the suspend feature | |
3016 | * on individual USB-2 ports. The devices will automatically go | |
3017 | * into suspend a few ms after the root hub stops sending packets. | |
3018 | * The USB 2.0 spec calls this "global suspend". | |
e583d9db AS |
3019 | * |
3020 | * However, many USB hubs have a bug: They don't relay wakeup requests | |
3021 | * from a downstream port if the port's suspend feature isn't on. | |
3022 | * Therefore we will turn on the suspend feature if udev or any of its | |
3023 | * descendants is enabled for remote wakeup. | |
0aa2832d | 3024 | */ |
e583d9db AS |
3025 | else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) |
3026 | status = set_port_feature(hub->hdev, port1, | |
3027 | USB_PORT_FEAT_SUSPEND); | |
0aa2832d AS |
3028 | else { |
3029 | really_suspend = false; | |
3030 | status = 0; | |
3031 | } | |
1da177e4 | 3032 | if (status) { |
624d6c07 AS |
3033 | dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", |
3034 | port1, status); | |
cbb33004 | 3035 | |
4fae6f0f AS |
3036 | /* Try to enable USB3 LPM and LTM again */ |
3037 | usb_unlocked_enable_lpm(udev); | |
3038 | err_lpm3: | |
3039 | usb_enable_ltm(udev); | |
3040 | err_ltm: | |
c3e751e4 AX |
3041 | /* Try to enable USB2 hardware LPM again */ |
3042 | if (udev->usb2_hw_lpm_capable == 1) | |
3043 | usb_set_usb2_hardware_lpm(udev, 1); | |
3044 | ||
4fae6f0f AS |
3045 | if (udev->do_remote_wakeup) |
3046 | (void) usb_disable_remote_wakeup(udev); | |
3047 | err_wakeup: | |
8306095f | 3048 | |
cbb33004 | 3049 | /* System sleep transitions should never fail */ |
5b1b0b81 | 3050 | if (!PMSG_IS_AUTO(msg)) |
cbb33004 | 3051 | status = 0; |
1da177e4 | 3052 | } else { |
30b1a7a3 AS |
3053 | dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", |
3054 | (PMSG_IS_AUTO(msg) ? "auto-" : ""), | |
3055 | udev->do_remote_wakeup); | |
0aa2832d AS |
3056 | if (really_suspend) { |
3057 | udev->port_is_suspended = 1; | |
e583d9db AS |
3058 | |
3059 | /* device has up to 10 msec to fully suspend */ | |
0aa2832d AS |
3060 | msleep(10); |
3061 | } | |
e583d9db | 3062 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
1da177e4 | 3063 | } |
ad493e5e | 3064 | |
4fae6f0f | 3065 | if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled) { |
98a4f1ff LT |
3066 | pm_runtime_put_sync(&port_dev->dev); |
3067 | port_dev->did_runtime_put = true; | |
ad493e5e LT |
3068 | } |
3069 | ||
c08512c7 | 3070 | usb_mark_last_busy(hub->hdev); |
1da177e4 LT |
3071 | return status; |
3072 | } | |
3073 | ||
1da177e4 | 3074 | /* |
390a8c34 DB |
3075 | * If the USB "suspend" state is in use (rather than "global suspend"), |
3076 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 3077 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
3078 | * hardware resume signaling is finished, either because of selective |
3079 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
3080 | * in the tree that's rooted at this device. | |
54515fe5 AS |
3081 | * |
3082 | * If @udev->reset_resume is set then the device is reset before the | |
3083 | * status check is done. | |
1da177e4 | 3084 | */ |
140d8f68 | 3085 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 3086 | { |
54515fe5 | 3087 | int status = 0; |
07e72b95 | 3088 | u16 devstatus = 0; |
1da177e4 LT |
3089 | |
3090 | /* caller owns the udev device lock */ | |
b9cef6c3 WF |
3091 | dev_dbg(&udev->dev, "%s\n", |
3092 | udev->reset_resume ? "finish reset-resume" : "finish resume"); | |
1da177e4 LT |
3093 | |
3094 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
3095 | * state the device resumes to. Linux currently won't see the | |
3096 | * first two on the host side; they'd be inside hub_port_init() | |
3097 | * during many timeouts, but khubd can't suspend until later. | |
3098 | */ | |
3099 | usb_set_device_state(udev, udev->actconfig | |
3100 | ? USB_STATE_CONFIGURED | |
3101 | : USB_STATE_ADDRESS); | |
1da177e4 | 3102 | |
54515fe5 AS |
3103 | /* 10.5.4.5 says not to reset a suspended port if the attached |
3104 | * device is enabled for remote wakeup. Hence the reset | |
3105 | * operation is carried out here, after the port has been | |
3106 | * resumed. | |
3107 | */ | |
3108 | if (udev->reset_resume) | |
86c57edf | 3109 | retry_reset_resume: |
742120c6 | 3110 | status = usb_reset_and_verify_device(udev); |
54515fe5 | 3111 | |
469271f8 MB |
3112 | /* 10.5.4.5 says be sure devices in the tree are still there. |
3113 | * For now let's assume the device didn't go crazy on resume, | |
1da177e4 LT |
3114 | * and device drivers will know about any resume quirks. |
3115 | */ | |
54515fe5 | 3116 | if (status == 0) { |
46dede46 | 3117 | devstatus = 0; |
54515fe5 | 3118 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
86c57edf AS |
3119 | |
3120 | /* If a normal resume failed, try doing a reset-resume */ | |
3121 | if (status && !udev->reset_resume && udev->persist_enabled) { | |
3122 | dev_dbg(&udev->dev, "retry with reset-resume\n"); | |
3123 | udev->reset_resume = 1; | |
3124 | goto retry_reset_resume; | |
3125 | } | |
54515fe5 | 3126 | } |
b40b7a90 | 3127 | |
624d6c07 AS |
3128 | if (status) { |
3129 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
3130 | status); | |
07e72b95 ON |
3131 | /* |
3132 | * There are a few quirky devices which violate the standard | |
3133 | * by claiming to have remote wakeup enabled after a reset, | |
3134 | * which crash if the feature is cleared, hence check for | |
3135 | * udev->reset_resume | |
3136 | */ | |
3137 | } else if (udev->actconfig && !udev->reset_resume) { | |
28e86165 | 3138 | if (udev->speed < USB_SPEED_SUPER) { |
54a3ac0c | 3139 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) |
28e86165 | 3140 | status = usb_disable_remote_wakeup(udev); |
54a3ac0c LT |
3141 | } else { |
3142 | status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, | |
3143 | &devstatus); | |
54a3ac0c LT |
3144 | if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP |
3145 | | USB_INTRF_STAT_FUNC_RW)) | |
28e86165 | 3146 | status = usb_disable_remote_wakeup(udev); |
4bf0ba86 | 3147 | } |
54a3ac0c LT |
3148 | |
3149 | if (status) | |
3150 | dev_dbg(&udev->dev, | |
3151 | "disable remote wakeup, status %d\n", | |
3152 | status); | |
1da177e4 | 3153 | status = 0; |
1da177e4 LT |
3154 | } |
3155 | return status; | |
3156 | } | |
3157 | ||
624d6c07 AS |
3158 | /* |
3159 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
3160 | * @udev: device to re-activate, not a root hub | |
3161 | * Context: must be able to sleep; device not locked; pm locks held | |
3162 | * | |
3163 | * This will re-activate the suspended device, increasing power usage | |
3164 | * while letting drivers communicate again with its endpoints. | |
3165 | * USB resume explicitly guarantees that the power session between | |
3166 | * the host and the device is the same as it was when the device | |
3167 | * suspended. | |
3168 | * | |
feccc30d AS |
3169 | * If @udev->reset_resume is set then this routine won't check that the |
3170 | * port is still enabled. Furthermore, finish_port_resume() above will | |
54515fe5 AS |
3171 | * reset @udev. The end result is that a broken power session can be |
3172 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
3173 | * | |
3174 | * For example, if a host controller doesn't maintain VBUS suspend current | |
3175 | * during a system sleep or is reset when the system wakes up, all the USB | |
3176 | * power sessions below it will be broken. This is especially troublesome | |
3177 | * for mass-storage devices containing mounted filesystems, since the | |
3178 | * device will appear to have disconnected and all the memory mappings | |
3179 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
3180 | * made to appear as if it had not disconnected. | |
3181 | * | |
742120c6 | 3182 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
feccc30d | 3183 | * every effort to insure that the same device is present after the |
54515fe5 AS |
3184 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
3185 | * quite possible for a device to remain unaltered but its media to be | |
3186 | * changed. If the user replaces a flash memory card while the system is | |
3187 | * asleep, he will have only himself to blame when the filesystem on the | |
3188 | * new card is corrupted and the system crashes. | |
3189 | * | |
624d6c07 AS |
3190 | * Returns 0 on success, else negative errno. |
3191 | */ | |
65bfd296 | 3192 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 3193 | { |
ad493e5e LT |
3194 | struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
3195 | struct usb_port *port_dev = hub->ports[udev->portnum - 1]; | |
624d6c07 AS |
3196 | int port1 = udev->portnum; |
3197 | int status; | |
3198 | u16 portchange, portstatus; | |
d25450c6 | 3199 | |
ad493e5e LT |
3200 | if (port_dev->did_runtime_put) { |
3201 | status = pm_runtime_get_sync(&port_dev->dev); | |
3202 | port_dev->did_runtime_put = false; | |
3203 | if (status < 0) { | |
3204 | dev_dbg(&udev->dev, "can't resume usb port, status %d\n", | |
3205 | status); | |
3206 | return status; | |
3207 | } | |
3208 | } | |
3209 | ||
d25450c6 AS |
3210 | /* Skip the initial Clear-Suspend step for a remote wakeup */ |
3211 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
0ed9a57e | 3212 | if (status == 0 && !port_is_suspended(hub, portstatus)) |
d25450c6 | 3213 | goto SuspendCleared; |
1da177e4 | 3214 | |
781b2137 | 3215 | /* dev_dbg(hub->intfdev, "resume port %d\n", port1); */ |
1da177e4 | 3216 | |
d5cbad4b AS |
3217 | set_bit(port1, hub->busy_bits); |
3218 | ||
1da177e4 | 3219 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
a7114230 | 3220 | if (hub_is_superspeed(hub->hdev)) |
c2f60db7 | 3221 | status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); |
a7114230 | 3222 | else |
ad493e5e | 3223 | status = usb_clear_port_feature(hub->hdev, |
a7114230 | 3224 | port1, USB_PORT_FEAT_SUSPEND); |
1da177e4 | 3225 | if (status) { |
624d6c07 AS |
3226 | dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", |
3227 | port1, status); | |
1da177e4 | 3228 | } else { |
1da177e4 | 3229 | /* drive resume for at least 20 msec */ |
686314cf | 3230 | dev_dbg(&udev->dev, "usb %sresume\n", |
5b1b0b81 | 3231 | (PMSG_IS_AUTO(msg) ? "auto-" : "")); |
1da177e4 LT |
3232 | msleep(25); |
3233 | ||
1da177e4 LT |
3234 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
3235 | * stop resume signaling. Then finish the resume | |
3236 | * sequence. | |
3237 | */ | |
d25450c6 | 3238 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 | 3239 | |
b01b03f3 AS |
3240 | /* TRSMRCY = 10 msec */ |
3241 | msleep(10); | |
3242 | } | |
3243 | ||
54515fe5 | 3244 | SuspendCleared: |
b01b03f3 | 3245 | if (status == 0) { |
bfd1e910 | 3246 | udev->port_is_suspended = 0; |
a7114230 AX |
3247 | if (hub_is_superspeed(hub->hdev)) { |
3248 | if (portchange & USB_PORT_STAT_C_LINK_STATE) | |
ad493e5e | 3249 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3250 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
3251 | } else { | |
3252 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
ad493e5e | 3253 | usb_clear_port_feature(hub->hdev, port1, |
a7114230 AX |
3254 | USB_PORT_FEAT_C_SUSPEND); |
3255 | } | |
1da177e4 | 3256 | } |
1da177e4 | 3257 | |
d5cbad4b | 3258 | clear_bit(port1, hub->busy_bits); |
d5cbad4b | 3259 | |
b01b03f3 AS |
3260 | status = check_port_resume_type(udev, |
3261 | hub, port1, status, portchange, portstatus); | |
54515fe5 AS |
3262 | if (status == 0) |
3263 | status = finish_port_resume(udev); | |
3264 | if (status < 0) { | |
3265 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
3266 | hub_port_logical_disconnect(hub, port1); | |
65580b43 AX |
3267 | } else { |
3268 | /* Try to enable USB2 hardware LPM */ | |
3269 | if (udev->usb2_hw_lpm_capable == 1) | |
3270 | usb_set_usb2_hardware_lpm(udev, 1); | |
8306095f | 3271 | |
f74631e3 SS |
3272 | /* Try to enable USB3 LTM and LPM */ |
3273 | usb_enable_ltm(udev); | |
8306095f | 3274 | usb_unlocked_enable_lpm(udev); |
54515fe5 | 3275 | } |
65580b43 | 3276 | |
1da177e4 LT |
3277 | return status; |
3278 | } | |
3279 | ||
84ebc102 AS |
3280 | #ifdef CONFIG_PM_RUNTIME |
3281 | ||
8808f00c | 3282 | /* caller has locked udev */ |
0534d468 | 3283 | int usb_remote_wakeup(struct usb_device *udev) |
1da177e4 LT |
3284 | { |
3285 | int status = 0; | |
3286 | ||
1da177e4 | 3287 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 3288 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
9bbdf1e0 AS |
3289 | status = usb_autoresume_device(udev); |
3290 | if (status == 0) { | |
3291 | /* Let the drivers do their thing, then... */ | |
3292 | usb_autosuspend_device(udev); | |
3293 | } | |
1da177e4 | 3294 | } |
1da177e4 LT |
3295 | return status; |
3296 | } | |
3297 | ||
d388dab7 AS |
3298 | #endif |
3299 | ||
e6f30dea ML |
3300 | static int check_ports_changed(struct usb_hub *hub) |
3301 | { | |
3302 | int port1; | |
3303 | ||
3304 | for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { | |
3305 | u16 portstatus, portchange; | |
3306 | int status; | |
3307 | ||
3308 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
3309 | if (!status && portchange) | |
3310 | return 1; | |
3311 | } | |
3312 | return 0; | |
3313 | } | |
3314 | ||
db690874 | 3315 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 LT |
3316 | { |
3317 | struct usb_hub *hub = usb_get_intfdata (intf); | |
3318 | struct usb_device *hdev = hub->hdev; | |
3319 | unsigned port1; | |
4296c70a | 3320 | int status; |
1da177e4 | 3321 | |
e583d9db AS |
3322 | /* |
3323 | * Warn if children aren't already suspended. | |
3324 | * Also, add up the number of wakeup-enabled descendants. | |
3325 | */ | |
3326 | hub->wakeup_enabled_descendants = 0; | |
1da177e4 LT |
3327 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
3328 | struct usb_device *udev; | |
3329 | ||
ff823c79 | 3330 | udev = hub->ports[port1 - 1]->child; |
6840d255 | 3331 | if (udev && udev->can_submit) { |
025d4430 RB |
3332 | dev_warn(&intf->dev, "port %d not suspended yet\n", |
3333 | port1); | |
5b1b0b81 | 3334 | if (PMSG_IS_AUTO(msg)) |
cbb33004 | 3335 | return -EBUSY; |
c9f89fa4 | 3336 | } |
e583d9db AS |
3337 | if (udev) |
3338 | hub->wakeup_enabled_descendants += | |
3339 | wakeup_enabled_descendants(udev); | |
1da177e4 | 3340 | } |
e6f30dea ML |
3341 | |
3342 | if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { | |
3343 | /* check if there are changes pending on hub ports */ | |
3344 | if (check_ports_changed(hub)) { | |
3345 | if (PMSG_IS_AUTO(msg)) | |
3346 | return -EBUSY; | |
3347 | pm_wakeup_event(&hdev->dev, 2000); | |
3348 | } | |
3349 | } | |
3350 | ||
4296c70a SS |
3351 | if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { |
3352 | /* Enable hub to send remote wakeup for all ports. */ | |
3353 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { | |
3354 | status = set_port_feature(hdev, | |
3355 | port1 | | |
3356 | USB_PORT_FEAT_REMOTE_WAKE_CONNECT | | |
3357 | USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | | |
3358 | USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, | |
3359 | USB_PORT_FEAT_REMOTE_WAKE_MASK); | |
3360 | } | |
3361 | } | |
1da177e4 | 3362 | |
441b62c1 | 3363 | dev_dbg(&intf->dev, "%s\n", __func__); |
40f122f3 | 3364 | |
12f1ff83 | 3365 | /* stop khubd and related activity */ |
4330354f | 3366 | hub_quiesce(hub, HUB_SUSPEND); |
b6f6436d | 3367 | return 0; |
1da177e4 LT |
3368 | } |
3369 | ||
3370 | static int hub_resume(struct usb_interface *intf) | |
3371 | { | |
5e6effae | 3372 | struct usb_hub *hub = usb_get_intfdata(intf); |
40f122f3 | 3373 | |
5e6effae | 3374 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3375 | hub_activate(hub, HUB_RESUME); |
1da177e4 LT |
3376 | return 0; |
3377 | } | |
3378 | ||
b41a60ec | 3379 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 3380 | { |
b41a60ec | 3381 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf | 3382 | |
5e6effae | 3383 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 3384 | hub_activate(hub, HUB_RESET_RESUME); |
f07600cf AS |
3385 | return 0; |
3386 | } | |
3387 | ||
54515fe5 AS |
3388 | /** |
3389 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
3390 | * @rhdev: struct usb_device for the root hub | |
3391 | * | |
3392 | * The USB host controller driver calls this function when its root hub | |
3393 | * is resumed and Vbus power has been interrupted or the controller | |
feccc30d AS |
3394 | * has been reset. The routine marks @rhdev as having lost power. |
3395 | * When the hub driver is resumed it will take notice and carry out | |
3396 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; | |
3397 | * the others will be disconnected. | |
54515fe5 AS |
3398 | */ |
3399 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
3400 | { | |
3401 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
3402 | rhdev->reset_resume = 1; | |
3403 | } | |
3404 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
3405 | ||
1ea7e0e8 SS |
3406 | static const char * const usb3_lpm_names[] = { |
3407 | "U0", | |
3408 | "U1", | |
3409 | "U2", | |
3410 | "U3", | |
3411 | }; | |
3412 | ||
3413 | /* | |
3414 | * Send a Set SEL control transfer to the device, prior to enabling | |
3415 | * device-initiated U1 or U2. This lets the device know the exit latencies from | |
3416 | * the time the device initiates a U1 or U2 exit, to the time it will receive a | |
3417 | * packet from the host. | |
3418 | * | |
3419 | * This function will fail if the SEL or PEL values for udev are greater than | |
3420 | * the maximum allowed values for the link state to be enabled. | |
3421 | */ | |
3422 | static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) | |
3423 | { | |
3424 | struct usb_set_sel_req *sel_values; | |
3425 | unsigned long long u1_sel; | |
3426 | unsigned long long u1_pel; | |
3427 | unsigned long long u2_sel; | |
3428 | unsigned long long u2_pel; | |
3429 | int ret; | |
3430 | ||
38d7f688 XR |
3431 | if (udev->state != USB_STATE_CONFIGURED) |
3432 | return 0; | |
3433 | ||
1ea7e0e8 SS |
3434 | /* Convert SEL and PEL stored in ns to us */ |
3435 | u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); | |
3436 | u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); | |
3437 | u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); | |
3438 | u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); | |
3439 | ||
3440 | /* | |
3441 | * Make sure that the calculated SEL and PEL values for the link | |
3442 | * state we're enabling aren't bigger than the max SEL/PEL | |
3443 | * value that will fit in the SET SEL control transfer. | |
3444 | * Otherwise the device would get an incorrect idea of the exit | |
3445 | * latency for the link state, and could start a device-initiated | |
3446 | * U1/U2 when the exit latencies are too high. | |
3447 | */ | |
3448 | if ((state == USB3_LPM_U1 && | |
3449 | (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || | |
3450 | u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || | |
3451 | (state == USB3_LPM_U2 && | |
3452 | (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || | |
3453 | u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { | |
1510a1a2 | 3454 | dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", |
1ea7e0e8 SS |
3455 | usb3_lpm_names[state], u1_sel, u1_pel); |
3456 | return -EINVAL; | |
3457 | } | |
3458 | ||
3459 | /* | |
3460 | * If we're enabling device-initiated LPM for one link state, | |
3461 | * but the other link state has a too high SEL or PEL value, | |
3462 | * just set those values to the max in the Set SEL request. | |
3463 | */ | |
3464 | if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) | |
3465 | u1_sel = USB3_LPM_MAX_U1_SEL_PEL; | |
3466 | ||
3467 | if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) | |
3468 | u1_pel = USB3_LPM_MAX_U1_SEL_PEL; | |
3469 | ||
3470 | if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) | |
3471 | u2_sel = USB3_LPM_MAX_U2_SEL_PEL; | |
3472 | ||
3473 | if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) | |
3474 | u2_pel = USB3_LPM_MAX_U2_SEL_PEL; | |
3475 | ||
3476 | /* | |
3477 | * usb_enable_lpm() can be called as part of a failed device reset, | |
3478 | * which may be initiated by an error path of a mass storage driver. | |
3479 | * Therefore, use GFP_NOIO. | |
3480 | */ | |
3481 | sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); | |
3482 | if (!sel_values) | |
3483 | return -ENOMEM; | |
3484 | ||
3485 | sel_values->u1_sel = u1_sel; | |
3486 | sel_values->u1_pel = u1_pel; | |
3487 | sel_values->u2_sel = cpu_to_le16(u2_sel); | |
3488 | sel_values->u2_pel = cpu_to_le16(u2_pel); | |
3489 | ||
3490 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3491 | USB_REQ_SET_SEL, | |
3492 | USB_RECIP_DEVICE, | |
3493 | 0, 0, | |
3494 | sel_values, sizeof *(sel_values), | |
3495 | USB_CTRL_SET_TIMEOUT); | |
3496 | kfree(sel_values); | |
3497 | return ret; | |
3498 | } | |
3499 | ||
3500 | /* | |
3501 | * Enable or disable device-initiated U1 or U2 transitions. | |
3502 | */ | |
3503 | static int usb_set_device_initiated_lpm(struct usb_device *udev, | |
3504 | enum usb3_link_state state, bool enable) | |
3505 | { | |
3506 | int ret; | |
3507 | int feature; | |
3508 | ||
3509 | switch (state) { | |
3510 | case USB3_LPM_U1: | |
3511 | feature = USB_DEVICE_U1_ENABLE; | |
3512 | break; | |
3513 | case USB3_LPM_U2: | |
3514 | feature = USB_DEVICE_U2_ENABLE; | |
3515 | break; | |
3516 | default: | |
3517 | dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", | |
3518 | __func__, enable ? "enable" : "disable"); | |
3519 | return -EINVAL; | |
3520 | } | |
3521 | ||
3522 | if (udev->state != USB_STATE_CONFIGURED) { | |
3523 | dev_dbg(&udev->dev, "%s: Can't %s %s state " | |
3524 | "for unconfigured device.\n", | |
3525 | __func__, enable ? "enable" : "disable", | |
3526 | usb3_lpm_names[state]); | |
3527 | return 0; | |
3528 | } | |
3529 | ||
3530 | if (enable) { | |
1ea7e0e8 SS |
3531 | /* |
3532 | * Now send the control transfer to enable device-initiated LPM | |
3533 | * for either U1 or U2. | |
3534 | */ | |
3535 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3536 | USB_REQ_SET_FEATURE, | |
3537 | USB_RECIP_DEVICE, | |
3538 | feature, | |
3539 | 0, NULL, 0, | |
3540 | USB_CTRL_SET_TIMEOUT); | |
3541 | } else { | |
3542 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
3543 | USB_REQ_CLEAR_FEATURE, | |
3544 | USB_RECIP_DEVICE, | |
3545 | feature, | |
3546 | 0, NULL, 0, | |
3547 | USB_CTRL_SET_TIMEOUT); | |
3548 | } | |
3549 | if (ret < 0) { | |
3550 | dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", | |
3551 | enable ? "Enable" : "Disable", | |
3552 | usb3_lpm_names[state]); | |
3553 | return -EBUSY; | |
3554 | } | |
3555 | return 0; | |
3556 | } | |
3557 | ||
3558 | static int usb_set_lpm_timeout(struct usb_device *udev, | |
3559 | enum usb3_link_state state, int timeout) | |
3560 | { | |
3561 | int ret; | |
3562 | int feature; | |
3563 | ||
3564 | switch (state) { | |
3565 | case USB3_LPM_U1: | |
3566 | feature = USB_PORT_FEAT_U1_TIMEOUT; | |
3567 | break; | |
3568 | case USB3_LPM_U2: | |
3569 | feature = USB_PORT_FEAT_U2_TIMEOUT; | |
3570 | break; | |
3571 | default: | |
3572 | dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", | |
3573 | __func__); | |
3574 | return -EINVAL; | |
3575 | } | |
3576 | ||
3577 | if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && | |
3578 | timeout != USB3_LPM_DEVICE_INITIATED) { | |
3579 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " | |
3580 | "which is a reserved value.\n", | |
3581 | usb3_lpm_names[state], timeout); | |
3582 | return -EINVAL; | |
3583 | } | |
3584 | ||
3585 | ret = set_port_feature(udev->parent, | |
3586 | USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, | |
3587 | feature); | |
3588 | if (ret < 0) { | |
3589 | dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," | |
3590 | "error code %i\n", usb3_lpm_names[state], | |
3591 | timeout, ret); | |
3592 | return -EBUSY; | |
3593 | } | |
3594 | if (state == USB3_LPM_U1) | |
3595 | udev->u1_params.timeout = timeout; | |
3596 | else | |
3597 | udev->u2_params.timeout = timeout; | |
3598 | return 0; | |
3599 | } | |
3600 | ||
3601 | /* | |
3602 | * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated | |
3603 | * U1/U2 entry. | |
3604 | * | |
3605 | * We will attempt to enable U1 or U2, but there are no guarantees that the | |
3606 | * control transfers to set the hub timeout or enable device-initiated U1/U2 | |
3607 | * will be successful. | |
3608 | * | |
3609 | * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI | |
3610 | * driver know about it. If that call fails, it should be harmless, and just | |
3611 | * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. | |
3612 | */ | |
3613 | static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
3614 | enum usb3_link_state state) | |
3615 | { | |
65a95b75 | 3616 | int timeout, ret; |
ae8963ad SS |
3617 | __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; |
3618 | __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; | |
3619 | ||
3620 | /* If the device says it doesn't have *any* exit latency to come out of | |
3621 | * U1 or U2, it's probably lying. Assume it doesn't implement that link | |
3622 | * state. | |
3623 | */ | |
3624 | if ((state == USB3_LPM_U1 && u1_mel == 0) || | |
3625 | (state == USB3_LPM_U2 && u2_mel == 0)) | |
3626 | return; | |
1ea7e0e8 | 3627 | |
65a95b75 SS |
3628 | /* |
3629 | * First, let the device know about the exit latencies | |
3630 | * associated with the link state we're about to enable. | |
3631 | */ | |
3632 | ret = usb_req_set_sel(udev, state); | |
3633 | if (ret < 0) { | |
3634 | dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", | |
3635 | usb3_lpm_names[state]); | |
3636 | return; | |
3637 | } | |
3638 | ||
1ea7e0e8 SS |
3639 | /* We allow the host controller to set the U1/U2 timeout internally |
3640 | * first, so that it can change its schedule to account for the | |
3641 | * additional latency to send data to a device in a lower power | |
3642 | * link state. | |
3643 | */ | |
3644 | timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); | |
3645 | ||
3646 | /* xHCI host controller doesn't want to enable this LPM state. */ | |
3647 | if (timeout == 0) | |
3648 | return; | |
3649 | ||
3650 | if (timeout < 0) { | |
3651 | dev_warn(&udev->dev, "Could not enable %s link state, " | |
3652 | "xHCI error %i.\n", usb3_lpm_names[state], | |
3653 | timeout); | |
3654 | return; | |
3655 | } | |
3656 | ||
3657 | if (usb_set_lpm_timeout(udev, state, timeout)) | |
3658 | /* If we can't set the parent hub U1/U2 timeout, | |
3659 | * device-initiated LPM won't be allowed either, so let the xHCI | |
3660 | * host know that this link state won't be enabled. | |
3661 | */ | |
3662 | hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); | |
3663 | ||
3664 | /* Only a configured device will accept the Set Feature U1/U2_ENABLE */ | |
3665 | else if (udev->actconfig) | |
3666 | usb_set_device_initiated_lpm(udev, state, true); | |
3667 | ||
3668 | } | |
3669 | ||
3670 | /* | |
3671 | * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated | |
3672 | * U1/U2 entry. | |
3673 | * | |
3674 | * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. | |
3675 | * If zero is returned, the parent will not allow the link to go into U1/U2. | |
3676 | * | |
3677 | * If zero is returned, device-initiated U1/U2 entry may still be enabled, but | |
3678 | * it won't have an effect on the bus link state because the parent hub will | |
3679 | * still disallow device-initiated U1/U2 entry. | |
3680 | * | |
3681 | * If zero is returned, the xHCI host controller may still think U1/U2 entry is | |
3682 | * possible. The result will be slightly more bus bandwidth will be taken up | |
3683 | * (to account for U1/U2 exit latency), but it should be harmless. | |
3684 | */ | |
3685 | static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, | |
3686 | enum usb3_link_state state) | |
3687 | { | |
3688 | int feature; | |
3689 | ||
3690 | switch (state) { | |
3691 | case USB3_LPM_U1: | |
3692 | feature = USB_PORT_FEAT_U1_TIMEOUT; | |
3693 | break; | |
3694 | case USB3_LPM_U2: | |
3695 | feature = USB_PORT_FEAT_U2_TIMEOUT; | |
3696 | break; | |
3697 | default: | |
3698 | dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", | |
3699 | __func__); | |
3700 | return -EINVAL; | |
3701 | } | |
3702 | ||
3703 | if (usb_set_lpm_timeout(udev, state, 0)) | |
3704 | return -EBUSY; | |
3705 | ||
3706 | usb_set_device_initiated_lpm(udev, state, false); | |
3707 | ||
3708 | if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) | |
3709 | dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " | |
3710 | "bus schedule bandwidth may be impacted.\n", | |
3711 | usb3_lpm_names[state]); | |
3712 | return 0; | |
3713 | } | |
3714 | ||
3715 | /* | |
3716 | * Disable hub-initiated and device-initiated U1 and U2 entry. | |
3717 | * Caller must own the bandwidth_mutex. | |
3718 | * | |
3719 | * This will call usb_enable_lpm() on failure, which will decrement | |
3720 | * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. | |
3721 | */ | |
3722 | int usb_disable_lpm(struct usb_device *udev) | |
3723 | { | |
3724 | struct usb_hcd *hcd; | |
3725 | ||
3726 | if (!udev || !udev->parent || | |
3727 | udev->speed != USB_SPEED_SUPER || | |
3728 | !udev->lpm_capable) | |
3729 | return 0; | |
3730 | ||
3731 | hcd = bus_to_hcd(udev->bus); | |
3732 | if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) | |
3733 | return 0; | |
3734 | ||
3735 | udev->lpm_disable_count++; | |
55558c33 | 3736 | if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) |
1ea7e0e8 SS |
3737 | return 0; |
3738 | ||
3739 | /* If LPM is enabled, attempt to disable it. */ | |
3740 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) | |
3741 | goto enable_lpm; | |
3742 | if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) | |
3743 | goto enable_lpm; | |
3744 | ||
3745 | return 0; | |
3746 | ||
3747 | enable_lpm: | |
3748 | usb_enable_lpm(udev); | |
3749 | return -EBUSY; | |
3750 | } | |
3751 | EXPORT_SYMBOL_GPL(usb_disable_lpm); | |
3752 | ||
3753 | /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ | |
3754 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
3755 | { | |
3756 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
3757 | int ret; | |
3758 | ||
3759 | if (!hcd) | |
3760 | return -EINVAL; | |
3761 | ||
3762 | mutex_lock(hcd->bandwidth_mutex); | |
3763 | ret = usb_disable_lpm(udev); | |
3764 | mutex_unlock(hcd->bandwidth_mutex); | |
3765 | ||
3766 | return ret; | |
3767 | } | |
3768 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); | |
3769 | ||
3770 | /* | |
3771 | * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The | |
3772 | * xHCI host policy may prevent U1 or U2 from being enabled. | |
3773 | * | |
3774 | * Other callers may have disabled link PM, so U1 and U2 entry will be disabled | |
3775 | * until the lpm_disable_count drops to zero. Caller must own the | |
3776 | * bandwidth_mutex. | |
3777 | */ | |
3778 | void usb_enable_lpm(struct usb_device *udev) | |
3779 | { | |
3780 | struct usb_hcd *hcd; | |
3781 | ||
3782 | if (!udev || !udev->parent || | |
3783 | udev->speed != USB_SPEED_SUPER || | |
3784 | !udev->lpm_capable) | |
3785 | return; | |
3786 | ||
3787 | udev->lpm_disable_count--; | |
3788 | hcd = bus_to_hcd(udev->bus); | |
3789 | /* Double check that we can both enable and disable LPM. | |
3790 | * Device must be configured to accept set feature U1/U2 timeout. | |
3791 | */ | |
3792 | if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || | |
3793 | !hcd->driver->disable_usb3_lpm_timeout) | |
3794 | return; | |
3795 | ||
3796 | if (udev->lpm_disable_count > 0) | |
3797 | return; | |
3798 | ||
3799 | usb_enable_link_state(hcd, udev, USB3_LPM_U1); | |
3800 | usb_enable_link_state(hcd, udev, USB3_LPM_U2); | |
3801 | } | |
3802 | EXPORT_SYMBOL_GPL(usb_enable_lpm); | |
3803 | ||
3804 | /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ | |
3805 | void usb_unlocked_enable_lpm(struct usb_device *udev) | |
3806 | { | |
3807 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
3808 | ||
3809 | if (!hcd) | |
3810 | return; | |
3811 | ||
3812 | mutex_lock(hcd->bandwidth_mutex); | |
3813 | usb_enable_lpm(udev); | |
3814 | mutex_unlock(hcd->bandwidth_mutex); | |
3815 | } | |
3816 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); | |
3817 | ||
3818 | ||
d388dab7 AS |
3819 | #else /* CONFIG_PM */ |
3820 | ||
f07600cf AS |
3821 | #define hub_suspend NULL |
3822 | #define hub_resume NULL | |
3823 | #define hub_reset_resume NULL | |
1ea7e0e8 SS |
3824 | |
3825 | int usb_disable_lpm(struct usb_device *udev) | |
3826 | { | |
3827 | return 0; | |
3828 | } | |
e9261fb6 | 3829 | EXPORT_SYMBOL_GPL(usb_disable_lpm); |
1ea7e0e8 SS |
3830 | |
3831 | void usb_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 3832 | EXPORT_SYMBOL_GPL(usb_enable_lpm); |
1ea7e0e8 SS |
3833 | |
3834 | int usb_unlocked_disable_lpm(struct usb_device *udev) | |
3835 | { | |
3836 | return 0; | |
3837 | } | |
e9261fb6 | 3838 | EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); |
1ea7e0e8 SS |
3839 | |
3840 | void usb_unlocked_enable_lpm(struct usb_device *udev) { } | |
e9261fb6 | 3841 | EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); |
f74631e3 SS |
3842 | |
3843 | int usb_disable_ltm(struct usb_device *udev) | |
3844 | { | |
3845 | return 0; | |
3846 | } | |
3847 | EXPORT_SYMBOL_GPL(usb_disable_ltm); | |
3848 | ||
3849 | void usb_enable_ltm(struct usb_device *udev) { } | |
3850 | EXPORT_SYMBOL_GPL(usb_enable_ltm); | |
c4b51a43 AS |
3851 | |
3852 | #endif /* CONFIG_PM */ | |
d388dab7 | 3853 | |
1da177e4 LT |
3854 | |
3855 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
3856 | * | |
3857 | * Between connect detection and reset signaling there must be a delay | |
3858 | * of 100ms at least for debounce and power-settling. The corresponding | |
3859 | * timer shall restart whenever the downstream port detects a disconnect. | |
469271f8 | 3860 | * |
1da177e4 LT |
3861 | * Apparently there are some bluetooth and irda-dongles and a number of |
3862 | * low-speed devices for which this debounce period may last over a second. | |
3863 | * Not covered by the spec - but easy to deal with. | |
3864 | * | |
3865 | * This implementation uses a 1500ms total debounce timeout; if the | |
3866 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
3867 | * every 25ms for transient disconnects. When the port status has been | |
3868 | * unchanged for 100ms it returns the port status. | |
3869 | */ | |
ad493e5e | 3870 | int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) |
1da177e4 LT |
3871 | { |
3872 | int ret; | |
3873 | int total_time, stable_time = 0; | |
3874 | u16 portchange, portstatus; | |
3875 | unsigned connection = 0xffff; | |
3876 | ||
3877 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
3878 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
3879 | if (ret < 0) | |
3880 | return ret; | |
3881 | ||
3882 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
3883 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
ad493e5e LT |
3884 | if (!must_be_connected || |
3885 | (connection == USB_PORT_STAT_CONNECTION)) | |
3886 | stable_time += HUB_DEBOUNCE_STEP; | |
1da177e4 LT |
3887 | if (stable_time >= HUB_DEBOUNCE_STABLE) |
3888 | break; | |
3889 | } else { | |
3890 | stable_time = 0; | |
3891 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
3892 | } | |
3893 | ||
3894 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
ad493e5e | 3895 | usb_clear_port_feature(hub->hdev, port1, |
1da177e4 LT |
3896 | USB_PORT_FEAT_C_CONNECTION); |
3897 | } | |
3898 | ||
3899 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
3900 | break; | |
3901 | msleep(HUB_DEBOUNCE_STEP); | |
3902 | } | |
3903 | ||
3904 | dev_dbg (hub->intfdev, | |
3905 | "debounce: port %d: total %dms stable %dms status 0x%x\n", | |
3906 | port1, total_time, stable_time, portstatus); | |
3907 | ||
3908 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
3909 | return -ETIMEDOUT; | |
3910 | return portstatus; | |
3911 | } | |
3912 | ||
fc721f51 | 3913 | void usb_ep0_reinit(struct usb_device *udev) |
1da177e4 | 3914 | { |
ddeac4e7 AS |
3915 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
3916 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); | |
2caf7fcd | 3917 | usb_enable_endpoint(udev, &udev->ep0, true); |
1da177e4 | 3918 | } |
fc721f51 | 3919 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
1da177e4 LT |
3920 | |
3921 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
3922 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
3923 | ||
4326ed0b | 3924 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
3925 | { |
3926 | int retval; | |
c6515272 | 3927 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 3928 | |
c6515272 SS |
3929 | /* |
3930 | * The host controller will choose the device address, | |
3931 | * instead of the core having chosen it earlier | |
3932 | */ | |
3933 | if (!hcd->driver->address_device && devnum <= 1) | |
1da177e4 LT |
3934 | return -EINVAL; |
3935 | if (udev->state == USB_STATE_ADDRESS) | |
3936 | return 0; | |
3937 | if (udev->state != USB_STATE_DEFAULT) | |
3938 | return -EINVAL; | |
c8d4af8e | 3939 | if (hcd->driver->address_device) |
c6515272 | 3940 | retval = hcd->driver->address_device(hcd, udev); |
c8d4af8e | 3941 | else |
c6515272 SS |
3942 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
3943 | USB_REQ_SET_ADDRESS, 0, devnum, 0, | |
3944 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1da177e4 | 3945 | if (retval == 0) { |
3b29b68b | 3946 | update_devnum(udev, devnum); |
4953d141 | 3947 | /* Device now using proper address. */ |
1da177e4 | 3948 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
fc721f51 | 3949 | usb_ep0_reinit(udev); |
1da177e4 LT |
3950 | } |
3951 | return retval; | |
3952 | } | |
3953 | ||
890dae88 MN |
3954 | /* |
3955 | * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM | |
3956 | * when they're plugged into a USB 2.0 port, but they don't work when LPM is | |
3957 | * enabled. | |
3958 | * | |
3959 | * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the | |
3960 | * device says it supports the new USB 2.0 Link PM errata by setting the BESL | |
3961 | * support bit in the BOS descriptor. | |
3962 | */ | |
3963 | static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) | |
3964 | { | |
3965 | int connect_type; | |
3966 | ||
3967 | if (!udev->usb2_hw_lpm_capable) | |
3968 | return; | |
3969 | ||
3970 | connect_type = usb_get_hub_port_connect_type(udev->parent, | |
3971 | udev->portnum); | |
3972 | ||
23c05820 | 3973 | if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || |
890dae88 MN |
3974 | connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
3975 | udev->usb2_hw_lpm_allowed = 1; | |
3976 | usb_set_usb2_hardware_lpm(udev, 1); | |
3977 | } | |
3978 | } | |
3979 | ||
48fc7dbd DW |
3980 | static int hub_enable_device(struct usb_device *udev) |
3981 | { | |
3982 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
3983 | ||
3984 | if (!hcd->driver->enable_device) | |
3985 | return 0; | |
3986 | if (udev->state == USB_STATE_ADDRESS) | |
3987 | return 0; | |
3988 | if (udev->state != USB_STATE_DEFAULT) | |
3989 | return -EINVAL; | |
3990 | ||
3991 | return hcd->driver->enable_device(hcd, udev); | |
3992 | } | |
3993 | ||
1da177e4 LT |
3994 | /* Reset device, (re)assign address, get device descriptor. |
3995 | * Device connection must be stable, no more debouncing needed. | |
3996 | * Returns device in USB_STATE_ADDRESS, except on error. | |
3997 | * | |
3998 | * If this is called for an already-existing device (as part of | |
742120c6 | 3999 | * usb_reset_and_verify_device), the caller must own the device lock. For a |
1da177e4 LT |
4000 | * newly detected device that is not accessible through any global |
4001 | * pointers, it's not necessary to lock the device. | |
4002 | */ | |
4003 | static int | |
4004 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, | |
4005 | int retry_counter) | |
4006 | { | |
4186ecf8 | 4007 | static DEFINE_MUTEX(usb_address0_mutex); |
1da177e4 LT |
4008 | |
4009 | struct usb_device *hdev = hub->hdev; | |
e7b77172 | 4010 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
1da177e4 LT |
4011 | int i, j, retval; |
4012 | unsigned delay = HUB_SHORT_RESET_TIME; | |
4013 | enum usb_device_speed oldspeed = udev->speed; | |
e538dfda | 4014 | const char *speed; |
4326ed0b | 4015 | int devnum = udev->devnum; |
1da177e4 LT |
4016 | |
4017 | /* root hub ports have a slightly longer reset period | |
4018 | * (from USB 2.0 spec, section 7.1.7.5) | |
4019 | */ | |
4020 | if (!hdev->parent) { | |
4021 | delay = HUB_ROOT_RESET_TIME; | |
4022 | if (port1 == hdev->bus->otg_port) | |
4023 | hdev->bus->b_hnp_enable = 0; | |
4024 | } | |
4025 | ||
4026 | /* Some low speed devices have problems with the quick delay, so */ | |
4027 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
4028 | if (oldspeed == USB_SPEED_LOW) | |
4029 | delay = HUB_LONG_RESET_TIME; | |
4030 | ||
4186ecf8 | 4031 | mutex_lock(&usb_address0_mutex); |
1da177e4 | 4032 | |
07194ab7 LT |
4033 | /* Reset the device; full speed may morph to high speed */ |
4034 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ | |
75d7cf72 | 4035 | retval = hub_port_reset(hub, port1, udev, delay, false); |
07194ab7 LT |
4036 | if (retval < 0) /* error or disconnect */ |
4037 | goto fail; | |
4038 | /* success, speed is known */ | |
4039 | ||
1da177e4 LT |
4040 | retval = -ENODEV; |
4041 | ||
4042 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { | |
4043 | dev_dbg(&udev->dev, "device reset changed speed!\n"); | |
4044 | goto fail; | |
4045 | } | |
4046 | oldspeed = udev->speed; | |
4326ed0b | 4047 | |
1da177e4 LT |
4048 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
4049 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
4050 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
4051 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
4052 | */ |
4053 | switch (udev->speed) { | |
6b403b02 | 4054 | case USB_SPEED_SUPER: |
551cdbbe | 4055 | case USB_SPEED_WIRELESS: /* fixed at 512 */ |
551509d2 | 4056 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
5bb6e0ae | 4057 | break; |
1da177e4 | 4058 | case USB_SPEED_HIGH: /* fixed at 64 */ |
551509d2 | 4059 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4060 | break; |
4061 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
4062 | /* to determine the ep0 maxpacket size, try to read | |
4063 | * the device descriptor to get bMaxPacketSize0 and | |
4064 | * then correct our initial guess. | |
4065 | */ | |
551509d2 | 4066 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
4067 | break; |
4068 | case USB_SPEED_LOW: /* fixed at 8 */ | |
551509d2 | 4069 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
1da177e4 LT |
4070 | break; |
4071 | default: | |
4072 | goto fail; | |
4073 | } | |
e538dfda MN |
4074 | |
4075 | if (udev->speed == USB_SPEED_WIRELESS) | |
4076 | speed = "variable speed Wireless"; | |
4077 | else | |
4078 | speed = usb_speed_string(udev->speed); | |
4079 | ||
c6515272 SS |
4080 | if (udev->speed != USB_SPEED_SUPER) |
4081 | dev_info(&udev->dev, | |
e538dfda MN |
4082 | "%s %s USB device number %d using %s\n", |
4083 | (udev->config) ? "reset" : "new", speed, | |
3b29b68b | 4084 | devnum, udev->bus->controller->driver->name); |
1da177e4 LT |
4085 | |
4086 | /* Set up TT records, if needed */ | |
4087 | if (hdev->tt) { | |
4088 | udev->tt = hdev->tt; | |
4089 | udev->ttport = hdev->ttport; | |
4090 | } else if (udev->speed != USB_SPEED_HIGH | |
4091 | && hdev->speed == USB_SPEED_HIGH) { | |
d199c96d AS |
4092 | if (!hub->tt.hub) { |
4093 | dev_err(&udev->dev, "parent hub has no TT\n"); | |
4094 | retval = -EINVAL; | |
4095 | goto fail; | |
4096 | } | |
1da177e4 LT |
4097 | udev->tt = &hub->tt; |
4098 | udev->ttport = port1; | |
4099 | } | |
469271f8 | 4100 | |
1da177e4 LT |
4101 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? |
4102 | * Because device hardware and firmware is sometimes buggy in | |
4103 | * this area, and this is how Linux has done it for ages. | |
4104 | * Change it cautiously. | |
4105 | * | |
48fc7dbd | 4106 | * NOTE: If use_new_scheme() is true we will start by issuing |
1da177e4 LT |
4107 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, |
4108 | * so it may help with some non-standards-compliant devices. | |
4109 | * Otherwise we start with SET_ADDRESS and then try to read the | |
4110 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
4111 | * value. | |
4112 | */ | |
4113 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { | |
48fc7dbd DW |
4114 | bool did_new_scheme = false; |
4115 | ||
4116 | if (use_new_scheme(udev, retry_counter)) { | |
1da177e4 LT |
4117 | struct usb_device_descriptor *buf; |
4118 | int r = 0; | |
4119 | ||
48fc7dbd DW |
4120 | did_new_scheme = true; |
4121 | retval = hub_enable_device(udev); | |
938569eb ON |
4122 | if (retval < 0) { |
4123 | dev_err(&udev->dev, | |
4124 | "hub failed to enable device, error %d\n", | |
4125 | retval); | |
48fc7dbd | 4126 | goto fail; |
938569eb | 4127 | } |
48fc7dbd | 4128 | |
1da177e4 LT |
4129 | #define GET_DESCRIPTOR_BUFSIZE 64 |
4130 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
4131 | if (!buf) { | |
4132 | retval = -ENOMEM; | |
4133 | continue; | |
4134 | } | |
4135 | ||
b89ee19a AS |
4136 | /* Retry on all errors; some devices are flakey. |
4137 | * 255 is for WUSB devices, we actually need to use | |
4138 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 LT |
4139 | */ |
4140 | for (j = 0; j < 3; ++j) { | |
4141 | buf->bMaxPacketSize0 = 0; | |
4142 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
4143 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
4144 | USB_DT_DEVICE << 8, 0, | |
4145 | buf, GET_DESCRIPTOR_BUFSIZE, | |
fd7c519d | 4146 | initial_descriptor_timeout); |
1da177e4 | 4147 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 4148 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
4149 | if (buf->bDescriptorType == |
4150 | USB_DT_DEVICE) { | |
4151 | r = 0; | |
4152 | break; | |
4153 | } | |
4154 | /* FALL THROUGH */ | |
4155 | default: | |
4156 | if (r == 0) | |
4157 | r = -EPROTO; | |
4158 | break; | |
4159 | } | |
4160 | if (r == 0) | |
4161 | break; | |
4162 | } | |
4163 | udev->descriptor.bMaxPacketSize0 = | |
4164 | buf->bMaxPacketSize0; | |
4165 | kfree(buf); | |
4166 | ||
75d7cf72 | 4167 | retval = hub_port_reset(hub, port1, udev, delay, false); |
1da177e4 LT |
4168 | if (retval < 0) /* error or disconnect */ |
4169 | goto fail; | |
4170 | if (oldspeed != udev->speed) { | |
4171 | dev_dbg(&udev->dev, | |
4172 | "device reset changed speed!\n"); | |
4173 | retval = -ENODEV; | |
4174 | goto fail; | |
4175 | } | |
4176 | if (r) { | |
e9e88fb7 AS |
4177 | if (r != -ENODEV) |
4178 | dev_err(&udev->dev, "device descriptor read/64, error %d\n", | |
4179 | r); | |
1da177e4 LT |
4180 | retval = -EMSGSIZE; |
4181 | continue; | |
4182 | } | |
4183 | #undef GET_DESCRIPTOR_BUFSIZE | |
4184 | } | |
4185 | ||
469271f8 MB |
4186 | /* |
4187 | * If device is WUSB, we already assigned an | |
4188 | * unauthorized address in the Connect Ack sequence; | |
4189 | * authorization will assign the final address. | |
4190 | */ | |
c6515272 | 4191 | if (udev->wusb == 0) { |
6c529cdc IPG |
4192 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { |
4193 | retval = hub_set_address(udev, devnum); | |
4194 | if (retval >= 0) | |
4195 | break; | |
4196 | msleep(200); | |
4197 | } | |
4198 | if (retval < 0) { | |
e9e88fb7 AS |
4199 | if (retval != -ENODEV) |
4200 | dev_err(&udev->dev, "device not accepting address %d, error %d\n", | |
4201 | devnum, retval); | |
6c529cdc IPG |
4202 | goto fail; |
4203 | } | |
c6515272 SS |
4204 | if (udev->speed == USB_SPEED_SUPER) { |
4205 | devnum = udev->devnum; | |
4206 | dev_info(&udev->dev, | |
3b29b68b | 4207 | "%s SuperSpeed USB device number %d using %s\n", |
c6515272 | 4208 | (udev->config) ? "reset" : "new", |
3b29b68b | 4209 | devnum, udev->bus->controller->driver->name); |
c6515272 | 4210 | } |
6c529cdc IPG |
4211 | |
4212 | /* cope with hardware quirkiness: | |
4213 | * - let SET_ADDRESS settle, some device hardware wants it | |
4214 | * - read ep0 maxpacket even for high and low speed, | |
4215 | */ | |
4216 | msleep(10); | |
48fc7dbd DW |
4217 | /* use_new_scheme() checks the speed which may have |
4218 | * changed since the initial look so we cache the result | |
4219 | * in did_new_scheme | |
4220 | */ | |
4221 | if (did_new_scheme) | |
1da177e4 | 4222 | break; |
469271f8 | 4223 | } |
1da177e4 LT |
4224 | |
4225 | retval = usb_get_device_descriptor(udev, 8); | |
4226 | if (retval < 8) { | |
e9e88fb7 AS |
4227 | if (retval != -ENODEV) |
4228 | dev_err(&udev->dev, | |
b9cef6c3 WF |
4229 | "device descriptor read/8, error %d\n", |
4230 | retval); | |
1da177e4 LT |
4231 | if (retval >= 0) |
4232 | retval = -EMSGSIZE; | |
4233 | } else { | |
4234 | retval = 0; | |
4235 | break; | |
4236 | } | |
4237 | } | |
4238 | if (retval) | |
4239 | goto fail; | |
4240 | ||
b76baa81 | 4241 | if (hcd->phy && !hdev->parent) |
ac96511b | 4242 | usb_phy_notify_connect(hcd->phy, udev->speed); |
b76baa81 | 4243 | |
d8aec3db EF |
4244 | /* |
4245 | * Some superspeed devices have finished the link training process | |
4246 | * and attached to a superspeed hub port, but the device descriptor | |
4247 | * got from those devices show they aren't superspeed devices. Warm | |
4248 | * reset the port attached by the devices can fix them. | |
4249 | */ | |
4250 | if ((udev->speed == USB_SPEED_SUPER) && | |
4251 | (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { | |
4252 | dev_err(&udev->dev, "got a wrong device descriptor, " | |
4253 | "warm reset device\n"); | |
4254 | hub_port_reset(hub, port1, udev, | |
4255 | HUB_BH_RESET_TIME, true); | |
4256 | retval = -EINVAL; | |
4257 | goto fail; | |
4258 | } | |
4259 | ||
6b403b02 SS |
4260 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
4261 | udev->speed == USB_SPEED_SUPER) | |
4262 | i = 512; | |
4263 | else | |
4264 | i = udev->descriptor.bMaxPacketSize0; | |
29cc8897 | 4265 | if (usb_endpoint_maxp(&udev->ep0.desc) != i) { |
56626a72 | 4266 | if (udev->speed == USB_SPEED_LOW || |
1da177e4 | 4267 | !(i == 8 || i == 16 || i == 32 || i == 64)) { |
56626a72 | 4268 | dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); |
1da177e4 LT |
4269 | retval = -EMSGSIZE; |
4270 | goto fail; | |
4271 | } | |
56626a72 AS |
4272 | if (udev->speed == USB_SPEED_FULL) |
4273 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
4274 | else | |
4275 | dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); | |
1da177e4 | 4276 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
fc721f51 | 4277 | usb_ep0_reinit(udev); |
1da177e4 | 4278 | } |
469271f8 | 4279 | |
1da177e4 LT |
4280 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); |
4281 | if (retval < (signed)sizeof(udev->descriptor)) { | |
e9e88fb7 AS |
4282 | if (retval != -ENODEV) |
4283 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", | |
4284 | retval); | |
1da177e4 LT |
4285 | if (retval >= 0) |
4286 | retval = -ENOMSG; | |
4287 | goto fail; | |
4288 | } | |
4289 | ||
1ff4df56 AX |
4290 | if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { |
4291 | retval = usb_get_bos_descriptor(udev); | |
51e0a012 | 4292 | if (!retval) { |
d9b2099c | 4293 | udev->lpm_capable = usb_device_supports_lpm(udev); |
51e0a012 SS |
4294 | usb_set_lpm_parameters(udev); |
4295 | } | |
1ff4df56 | 4296 | } |
3148bf04 | 4297 | |
1da177e4 | 4298 | retval = 0; |
48f24970 AD |
4299 | /* notify HCD that we have a device connected and addressed */ |
4300 | if (hcd->driver->update_device) | |
4301 | hcd->driver->update_device(hcd, udev); | |
890dae88 | 4302 | hub_set_initial_usb2_lpm_policy(udev); |
1da177e4 | 4303 | fail: |
4326ed0b | 4304 | if (retval) { |
1da177e4 | 4305 | hub_port_disable(hub, port1, 0); |
3b29b68b | 4306 | update_devnum(udev, devnum); /* for disconnect processing */ |
4326ed0b | 4307 | } |
4186ecf8 | 4308 | mutex_unlock(&usb_address0_mutex); |
1da177e4 LT |
4309 | return retval; |
4310 | } | |
4311 | ||
4312 | static void | |
4313 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) | |
4314 | { | |
4315 | struct usb_qualifier_descriptor *qual; | |
4316 | int status; | |
4317 | ||
e94b1766 | 4318 | qual = kmalloc (sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
4319 | if (qual == NULL) |
4320 | return; | |
4321 | ||
4322 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, | |
4323 | qual, sizeof *qual); | |
4324 | if (status == sizeof *qual) { | |
4325 | dev_info(&udev->dev, "not running at top speed; " | |
4326 | "connect to a high speed hub\n"); | |
4327 | /* hub LEDs are probably harder to miss than syslog */ | |
4328 | if (hub->has_indicators) { | |
4329 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
22f6a0f0 SD |
4330 | queue_delayed_work(system_power_efficient_wq, |
4331 | &hub->leds, 0); | |
1da177e4 LT |
4332 | } |
4333 | } | |
1bc3c9e1 | 4334 | kfree(qual); |
1da177e4 LT |
4335 | } |
4336 | ||
4337 | static unsigned | |
4338 | hub_power_remaining (struct usb_hub *hub) | |
4339 | { | |
4340 | struct usb_device *hdev = hub->hdev; | |
4341 | int remaining; | |
55c52718 | 4342 | int port1; |
1da177e4 | 4343 | |
55c52718 | 4344 | if (!hub->limited_power) |
1da177e4 LT |
4345 | return 0; |
4346 | ||
55c52718 AS |
4347 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
4348 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
ff823c79 | 4349 | struct usb_device *udev = hub->ports[port1 - 1]->child; |
55c52718 | 4350 | int delta; |
430ee58e | 4351 | unsigned unit_load; |
1da177e4 LT |
4352 | |
4353 | if (!udev) | |
4354 | continue; | |
430ee58e SAS |
4355 | if (hub_is_superspeed(udev)) |
4356 | unit_load = 150; | |
4357 | else | |
4358 | unit_load = 100; | |
1da177e4 | 4359 | |
430ee58e SAS |
4360 | /* |
4361 | * Unconfigured devices may not use more than one unit load, | |
4362 | * or 8mA for OTG ports | |
4363 | */ | |
1da177e4 | 4364 | if (udev->actconfig) |
8d8479db | 4365 | delta = usb_get_max_power(udev, udev->actconfig); |
55c52718 | 4366 | else if (port1 != udev->bus->otg_port || hdev->parent) |
430ee58e | 4367 | delta = unit_load; |
1da177e4 | 4368 | else |
55c52718 AS |
4369 | delta = 8; |
4370 | if (delta > hub->mA_per_port) | |
b9cef6c3 WF |
4371 | dev_warn(&udev->dev, |
4372 | "%dmA is over %umA budget for port %d!\n", | |
4373 | delta, hub->mA_per_port, port1); | |
1da177e4 LT |
4374 | remaining -= delta; |
4375 | } | |
4376 | if (remaining < 0) { | |
55c52718 | 4377 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
469271f8 | 4378 | -remaining); |
1da177e4 LT |
4379 | remaining = 0; |
4380 | } | |
4381 | return remaining; | |
4382 | } | |
4383 | ||
4384 | /* Handle physical or logical connection change events. | |
4385 | * This routine is called when: | |
4386 | * a port connection-change occurs; | |
4387 | * a port enable-change occurs (often caused by EMI); | |
742120c6 | 4388 | * usb_reset_and_verify_device() encounters changed descriptors (as from |
1da177e4 LT |
4389 | * a firmware download) |
4390 | * caller already locked the hub | |
4391 | */ | |
4392 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
4393 | u16 portstatus, u16 portchange) | |
4394 | { | |
4395 | struct usb_device *hdev = hub->hdev; | |
4396 | struct device *hub_dev = hub->intfdev; | |
90da096e | 4397 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
24618b0c AS |
4398 | unsigned wHubCharacteristics = |
4399 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
8808f00c | 4400 | struct usb_device *udev; |
1da177e4 | 4401 | int status, i; |
430ee58e | 4402 | unsigned unit_load; |
24618b0c | 4403 | |
1da177e4 LT |
4404 | dev_dbg (hub_dev, |
4405 | "port %d, status %04x, change %04x, %s\n", | |
131dec34 | 4406 | port1, portstatus, portchange, portspeed(hub, portstatus)); |
1da177e4 LT |
4407 | |
4408 | if (hub->has_indicators) { | |
4409 | set_port_led(hub, port1, HUB_LED_AUTO); | |
4410 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
4411 | } | |
1da177e4 LT |
4412 | |
4413 | #ifdef CONFIG_USB_OTG | |
4414 | /* during HNP, don't repeat the debounce */ | |
4415 | if (hdev->bus->is_b_host) | |
24618b0c AS |
4416 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | |
4417 | USB_PORT_STAT_C_ENABLE); | |
1da177e4 LT |
4418 | #endif |
4419 | ||
8808f00c | 4420 | /* Try to resuscitate an existing device */ |
ff823c79 | 4421 | udev = hub->ports[port1 - 1]->child; |
8808f00c AS |
4422 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && |
4423 | udev->state != USB_STATE_NOTATTACHED) { | |
8808f00c AS |
4424 | usb_lock_device(udev); |
4425 | if (portstatus & USB_PORT_STAT_ENABLE) { | |
4426 | status = 0; /* Nothing to do */ | |
8808f00c | 4427 | |
84ebc102 | 4428 | #ifdef CONFIG_PM_RUNTIME |
5257d97a AS |
4429 | } else if (udev->state == USB_STATE_SUSPENDED && |
4430 | udev->persist_enabled) { | |
8808f00c AS |
4431 | /* For a suspended device, treat this as a |
4432 | * remote wakeup event. | |
4433 | */ | |
0534d468 | 4434 | status = usb_remote_wakeup(udev); |
8808f00c AS |
4435 | #endif |
4436 | ||
4437 | } else { | |
5257d97a | 4438 | status = -ENODEV; /* Don't resuscitate */ |
8808f00c AS |
4439 | } |
4440 | usb_unlock_device(udev); | |
4441 | ||
4442 | if (status == 0) { | |
4443 | clear_bit(port1, hub->change_bits); | |
4444 | return; | |
4445 | } | |
4446 | } | |
4447 | ||
24618b0c | 4448 | /* Disconnect any existing devices under this port */ |
b76baa81 PC |
4449 | if (udev) { |
4450 | if (hcd->phy && !hdev->parent && | |
4451 | !(portstatus & USB_PORT_STAT_CONNECTION)) | |
ac96511b | 4452 | usb_phy_notify_disconnect(hcd->phy, udev->speed); |
ff823c79 | 4453 | usb_disconnect(&hub->ports[port1 - 1]->child); |
b76baa81 | 4454 | } |
24618b0c AS |
4455 | clear_bit(port1, hub->change_bits); |
4456 | ||
253e0572 AS |
4457 | /* We can forget about a "removed" device when there's a physical |
4458 | * disconnect or the connect status changes. | |
4459 | */ | |
4460 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4461 | (portchange & USB_PORT_STAT_C_CONNECTION)) | |
4462 | clear_bit(port1, hub->removed_bits); | |
4463 | ||
5257d97a AS |
4464 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
4465 | USB_PORT_STAT_C_ENABLE)) { | |
ad493e5e | 4466 | status = hub_port_debounce_be_stable(hub, port1); |
5257d97a | 4467 | if (status < 0) { |
e9e88fb7 | 4468 | if (status != -ENODEV && printk_ratelimit()) |
5257d97a AS |
4469 | dev_err(hub_dev, "connect-debounce failed, " |
4470 | "port %d disabled\n", port1); | |
4471 | portstatus &= ~USB_PORT_STAT_CONNECTION; | |
4472 | } else { | |
4473 | portstatus = status; | |
4474 | } | |
4475 | } | |
4476 | ||
253e0572 AS |
4477 | /* Return now if debouncing failed or nothing is connected or |
4478 | * the device was "removed". | |
4479 | */ | |
4480 | if (!(portstatus & USB_PORT_STAT_CONNECTION) || | |
4481 | test_bit(port1, hub->removed_bits)) { | |
1da177e4 LT |
4482 | |
4483 | /* maybe switch power back on (e.g. root hub was reset) */ | |
74ad9bd2 | 4484 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
0ed9a57e | 4485 | && !port_is_power_on(hub, portstatus)) |
1da177e4 | 4486 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
5257d97a | 4487 | |
1da177e4 | 4488 | if (portstatus & USB_PORT_STAT_ENABLE) |
469271f8 | 4489 | goto done; |
1da177e4 LT |
4490 | return; |
4491 | } | |
430ee58e SAS |
4492 | if (hub_is_superspeed(hub->hdev)) |
4493 | unit_load = 150; | |
4494 | else | |
4495 | unit_load = 100; | |
1da177e4 | 4496 | |
e9e88fb7 | 4497 | status = 0; |
1da177e4 | 4498 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
1da177e4 LT |
4499 | |
4500 | /* reallocate for each attempt, since references | |
4501 | * to the previous one can escape in various ways | |
4502 | */ | |
4503 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
4504 | if (!udev) { | |
4505 | dev_err (hub_dev, | |
4506 | "couldn't allocate port %d usb_device\n", | |
4507 | port1); | |
4508 | goto done; | |
4509 | } | |
4510 | ||
4511 | usb_set_device_state(udev, USB_STATE_POWERED); | |
469271f8 | 4512 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 4513 | udev->level = hdev->level + 1; |
8af548dc | 4514 | udev->wusb = hub_is_wusb(hub); |
55c52718 | 4515 | |
131dec34 SS |
4516 | /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ |
4517 | if (hub_is_superspeed(hub->hdev)) | |
e7b77172 SS |
4518 | udev->speed = USB_SPEED_SUPER; |
4519 | else | |
4520 | udev->speed = USB_SPEED_UNKNOWN; | |
4521 | ||
3b29b68b | 4522 | choose_devnum(udev); |
c8d4af8e AX |
4523 | if (udev->devnum <= 0) { |
4524 | status = -ENOTCONN; /* Don't retry */ | |
4525 | goto loop; | |
c6515272 SS |
4526 | } |
4527 | ||
e7b77172 | 4528 | /* reset (non-USB 3.0 devices) and get descriptor */ |
1da177e4 LT |
4529 | status = hub_port_init(hub, udev, port1, i); |
4530 | if (status < 0) | |
4531 | goto loop; | |
4532 | ||
93362a87 PD |
4533 | usb_detect_quirks(udev); |
4534 | if (udev->quirks & USB_QUIRK_DELAY_INIT) | |
4535 | msleep(1000); | |
4536 | ||
1da177e4 LT |
4537 | /* consecutive bus-powered hubs aren't reliable; they can |
4538 | * violate the voltage drop budget. if the new child has | |
4539 | * a "powered" LED, users should notice we didn't enable it | |
4540 | * (without reading syslog), even without per-port LEDs | |
4541 | * on the parent. | |
4542 | */ | |
4543 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
430ee58e | 4544 | && udev->bus_mA <= unit_load) { |
1da177e4 LT |
4545 | u16 devstat; |
4546 | ||
4547 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
4548 | &devstat); | |
15b7336e | 4549 | if (status) { |
1da177e4 LT |
4550 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
4551 | goto loop_disable; | |
4552 | } | |
1da177e4 LT |
4553 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
4554 | dev_err(&udev->dev, | |
4555 | "can't connect bus-powered hub " | |
4556 | "to this port\n"); | |
4557 | if (hub->has_indicators) { | |
4558 | hub->indicator[port1-1] = | |
4559 | INDICATOR_AMBER_BLINK; | |
22f6a0f0 SD |
4560 | queue_delayed_work( |
4561 | system_power_efficient_wq, | |
4562 | &hub->leds, 0); | |
1da177e4 LT |
4563 | } |
4564 | status = -ENOTCONN; /* Don't retry */ | |
4565 | goto loop_disable; | |
4566 | } | |
4567 | } | |
469271f8 | 4568 | |
1da177e4 LT |
4569 | /* check for devices running slower than they could */ |
4570 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
4571 | && udev->speed == USB_SPEED_FULL | |
4572 | && highspeed_hubs != 0) | |
4573 | check_highspeed (hub, udev, port1); | |
4574 | ||
fa286188 | 4575 | /* Store the parent's children[] pointer. At this point |
1da177e4 LT |
4576 | * udev becomes globally accessible, although presumably |
4577 | * no one will look at it until hdev is unlocked. | |
4578 | */ | |
1da177e4 LT |
4579 | status = 0; |
4580 | ||
4581 | /* We mustn't add new devices if the parent hub has | |
4582 | * been disconnected; we would race with the | |
4583 | * recursively_mark_NOTATTACHED() routine. | |
4584 | */ | |
4585 | spin_lock_irq(&device_state_lock); | |
4586 | if (hdev->state == USB_STATE_NOTATTACHED) | |
4587 | status = -ENOTCONN; | |
4588 | else | |
ff823c79 | 4589 | hub->ports[port1 - 1]->child = udev; |
1da177e4 LT |
4590 | spin_unlock_irq(&device_state_lock); |
4591 | ||
4592 | /* Run it through the hoops (find a driver, etc) */ | |
4593 | if (!status) { | |
4594 | status = usb_new_device(udev); | |
4595 | if (status) { | |
4596 | spin_lock_irq(&device_state_lock); | |
ff823c79 | 4597 | hub->ports[port1 - 1]->child = NULL; |
1da177e4 LT |
4598 | spin_unlock_irq(&device_state_lock); |
4599 | } | |
4600 | } | |
4601 | ||
1da177e4 LT |
4602 | if (status) |
4603 | goto loop_disable; | |
4604 | ||
4605 | status = hub_power_remaining(hub); | |
4606 | if (status) | |
55c52718 | 4607 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
1da177e4 LT |
4608 | |
4609 | return; | |
4610 | ||
4611 | loop_disable: | |
4612 | hub_port_disable(hub, port1, 1); | |
4613 | loop: | |
fc721f51 | 4614 | usb_ep0_reinit(udev); |
3b29b68b | 4615 | release_devnum(udev); |
f7410ced | 4616 | hub_free_dev(udev); |
1da177e4 | 4617 | usb_put_dev(udev); |
ffcdc18d | 4618 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 LT |
4619 | break; |
4620 | } | |
3a31155c AS |
4621 | if (hub->hdev->parent || |
4622 | !hcd->driver->port_handed_over || | |
e9e88fb7 AS |
4623 | !(hcd->driver->port_handed_over)(hcd, port1)) { |
4624 | if (status != -ENOTCONN && status != -ENODEV) | |
4625 | dev_err(hub_dev, "unable to enumerate USB device on port %d\n", | |
4626 | port1); | |
4627 | } | |
469271f8 | 4628 | |
1da177e4 LT |
4629 | done: |
4630 | hub_port_disable(hub, port1, 1); | |
90da096e BR |
4631 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
4632 | hcd->driver->relinquish_port(hcd, port1); | |
1da177e4 LT |
4633 | } |
4634 | ||
714b07be SS |
4635 | /* Returns 1 if there was a remote wakeup and a connect status change. */ |
4636 | static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, | |
72937e1e | 4637 | u16 portstatus, u16 portchange) |
714b07be SS |
4638 | { |
4639 | struct usb_device *hdev; | |
4640 | struct usb_device *udev; | |
4641 | int connect_change = 0; | |
4642 | int ret; | |
4643 | ||
4644 | hdev = hub->hdev; | |
ff823c79 | 4645 | udev = hub->ports[port - 1]->child; |
4ee823b8 SS |
4646 | if (!hub_is_superspeed(hdev)) { |
4647 | if (!(portchange & USB_PORT_STAT_C_SUSPEND)) | |
4648 | return 0; | |
ad493e5e | 4649 | usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); |
4ee823b8 SS |
4650 | } else { |
4651 | if (!udev || udev->state != USB_STATE_SUSPENDED || | |
72937e1e SS |
4652 | (portstatus & USB_PORT_STAT_LINK_STATE) != |
4653 | USB_SS_PORT_LS_U0) | |
4ee823b8 SS |
4654 | return 0; |
4655 | } | |
4656 | ||
714b07be SS |
4657 | if (udev) { |
4658 | /* TRSMRCY = 10 msec */ | |
4659 | msleep(10); | |
4660 | ||
4661 | usb_lock_device(udev); | |
4662 | ret = usb_remote_wakeup(udev); | |
4663 | usb_unlock_device(udev); | |
4664 | if (ret < 0) | |
4665 | connect_change = 1; | |
4666 | } else { | |
4667 | ret = -ENODEV; | |
4668 | hub_port_disable(hub, port, 1); | |
4669 | } | |
4670 | dev_dbg(hub->intfdev, "resume on port %d, status %d\n", | |
4671 | port, ret); | |
4672 | return connect_change; | |
4673 | } | |
4674 | ||
1da177e4 LT |
4675 | static void hub_events(void) |
4676 | { | |
4677 | struct list_head *tmp; | |
4678 | struct usb_device *hdev; | |
4679 | struct usb_interface *intf; | |
4680 | struct usb_hub *hub; | |
4681 | struct device *hub_dev; | |
4682 | u16 hubstatus; | |
4683 | u16 hubchange; | |
4684 | u16 portstatus; | |
4685 | u16 portchange; | |
4686 | int i, ret; | |
4ee823b8 | 4687 | int connect_change, wakeup_change; |
1da177e4 LT |
4688 | |
4689 | /* | |
4690 | * We restart the list every time to avoid a deadlock with | |
4691 | * deleting hubs downstream from this one. This should be | |
4692 | * safe since we delete the hub from the event list. | |
4693 | * Not the most efficient, but avoids deadlocks. | |
4694 | */ | |
4695 | while (1) { | |
4696 | ||
4697 | /* Grab the first entry at the beginning of the list */ | |
4698 | spin_lock_irq(&hub_event_lock); | |
4699 | if (list_empty(&hub_event_list)) { | |
4700 | spin_unlock_irq(&hub_event_lock); | |
4701 | break; | |
4702 | } | |
4703 | ||
4704 | tmp = hub_event_list.next; | |
4705 | list_del_init(tmp); | |
4706 | ||
4707 | hub = list_entry(tmp, struct usb_hub, event_list); | |
e8054854 AS |
4708 | kref_get(&hub->kref); |
4709 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 4710 | |
e8054854 AS |
4711 | hdev = hub->hdev; |
4712 | hub_dev = hub->intfdev; | |
4713 | intf = to_usb_interface(hub_dev); | |
40f122f3 | 4714 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
3bbc47d8 | 4715 | hdev->state, hdev->maxchild, |
1da177e4 LT |
4716 | /* NOTE: expects max 15 ports... */ |
4717 | (u16) hub->change_bits[0], | |
40f122f3 | 4718 | (u16) hub->event_bits[0]); |
1da177e4 | 4719 | |
1da177e4 LT |
4720 | /* Lock the device, then check to see if we were |
4721 | * disconnected while waiting for the lock to succeed. */ | |
06b84e8a | 4722 | usb_lock_device(hdev); |
e8054854 | 4723 | if (unlikely(hub->disconnected)) |
9bbdf1e0 | 4724 | goto loop_disconnected; |
1da177e4 LT |
4725 | |
4726 | /* If the hub has died, clean up after it */ | |
4727 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
7de18d8b | 4728 | hub->error = -ENODEV; |
4330354f | 4729 | hub_quiesce(hub, HUB_DISCONNECT); |
1da177e4 LT |
4730 | goto loop; |
4731 | } | |
4732 | ||
40f122f3 AS |
4733 | /* Autoresume */ |
4734 | ret = usb_autopm_get_interface(intf); | |
4735 | if (ret) { | |
4736 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
4737 | goto loop; | |
4738 | } | |
a8e7c565 | 4739 | |
40f122f3 | 4740 | /* If this is an inactive hub, do nothing */ |
1da177e4 | 4741 | if (hub->quiescing) |
40f122f3 | 4742 | goto loop_autopm; |
1da177e4 LT |
4743 | |
4744 | if (hub->error) { | |
4745 | dev_dbg (hub_dev, "resetting for error %d\n", | |
4746 | hub->error); | |
4747 | ||
742120c6 | 4748 | ret = usb_reset_device(hdev); |
1da177e4 LT |
4749 | if (ret) { |
4750 | dev_dbg (hub_dev, | |
4751 | "error resetting hub: %d\n", ret); | |
40f122f3 | 4752 | goto loop_autopm; |
1da177e4 LT |
4753 | } |
4754 | ||
4755 | hub->nerrors = 0; | |
4756 | hub->error = 0; | |
4757 | } | |
4758 | ||
4759 | /* deal with port status changes */ | |
3bbc47d8 | 4760 | for (i = 1; i <= hdev->maxchild; i++) { |
1da177e4 LT |
4761 | if (test_bit(i, hub->busy_bits)) |
4762 | continue; | |
4763 | connect_change = test_bit(i, hub->change_bits); | |
72937e1e | 4764 | wakeup_change = test_and_clear_bit(i, hub->wakeup_bits); |
1da177e4 | 4765 | if (!test_and_clear_bit(i, hub->event_bits) && |
4ee823b8 | 4766 | !connect_change && !wakeup_change) |
1da177e4 LT |
4767 | continue; |
4768 | ||
4769 | ret = hub_port_status(hub, i, | |
4770 | &portstatus, &portchange); | |
4771 | if (ret < 0) | |
4772 | continue; | |
4773 | ||
1da177e4 | 4774 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
ad493e5e | 4775 | usb_clear_port_feature(hdev, i, |
1da177e4 LT |
4776 | USB_PORT_FEAT_C_CONNECTION); |
4777 | connect_change = 1; | |
4778 | } | |
4779 | ||
4780 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
4781 | if (!connect_change) | |
4782 | dev_dbg (hub_dev, | |
4783 | "port %d enable change, " | |
4784 | "status %08x\n", | |
4785 | i, portstatus); | |
ad493e5e | 4786 | usb_clear_port_feature(hdev, i, |
1da177e4 LT |
4787 | USB_PORT_FEAT_C_ENABLE); |
4788 | ||
4789 | /* | |
4790 | * EM interference sometimes causes badly | |
4791 | * shielded USB devices to be shutdown by | |
4792 | * the hub, this hack enables them again. | |
469271f8 | 4793 | * Works at least with mouse driver. |
1da177e4 LT |
4794 | */ |
4795 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
4796 | && !connect_change | |
ff823c79 | 4797 | && hub->ports[i - 1]->child) { |
1da177e4 LT |
4798 | dev_err (hub_dev, |
4799 | "port %i " | |
4800 | "disabled by hub (EMI?), " | |
4801 | "re-enabling...\n", | |
4802 | i); | |
4803 | connect_change = 1; | |
4804 | } | |
4805 | } | |
4806 | ||
72937e1e SS |
4807 | if (hub_handle_remote_wakeup(hub, i, |
4808 | portstatus, portchange)) | |
714b07be | 4809 | connect_change = 1; |
8808f00c | 4810 | |
1da177e4 | 4811 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { |
752d57a8 PB |
4812 | u16 status = 0; |
4813 | u16 unused; | |
4814 | ||
4815 | dev_dbg(hub_dev, "over-current change on port " | |
4816 | "%d\n", i); | |
ad493e5e | 4817 | usb_clear_port_feature(hdev, i, |
1da177e4 | 4818 | USB_PORT_FEAT_C_OVER_CURRENT); |
752d57a8 | 4819 | msleep(100); /* Cool down */ |
8520f380 | 4820 | hub_power_on(hub, true); |
752d57a8 PB |
4821 | hub_port_status(hub, i, &status, &unused); |
4822 | if (status & USB_PORT_STAT_OVERCURRENT) | |
4823 | dev_err(hub_dev, "over-current " | |
4824 | "condition on port %d\n", i); | |
1da177e4 LT |
4825 | } |
4826 | ||
4827 | if (portchange & USB_PORT_STAT_C_RESET) { | |
4828 | dev_dbg (hub_dev, | |
4829 | "reset change on port %d\n", | |
4830 | i); | |
ad493e5e | 4831 | usb_clear_port_feature(hdev, i, |
1da177e4 LT |
4832 | USB_PORT_FEAT_C_RESET); |
4833 | } | |
c7061574 SS |
4834 | if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
4835 | hub_is_superspeed(hub->hdev)) { | |
4836 | dev_dbg(hub_dev, | |
4837 | "warm reset change on port %d\n", | |
4838 | i); | |
ad493e5e | 4839 | usb_clear_port_feature(hdev, i, |
c7061574 SS |
4840 | USB_PORT_FEAT_C_BH_PORT_RESET); |
4841 | } | |
dbe79bbe | 4842 | if (portchange & USB_PORT_STAT_C_LINK_STATE) { |
ad493e5e | 4843 | usb_clear_port_feature(hub->hdev, i, |
dbe79bbe JY |
4844 | USB_PORT_FEAT_C_PORT_LINK_STATE); |
4845 | } | |
4846 | if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { | |
4847 | dev_warn(hub_dev, | |
4848 | "config error on port %d\n", | |
4849 | i); | |
ad493e5e | 4850 | usb_clear_port_feature(hub->hdev, i, |
dbe79bbe JY |
4851 | USB_PORT_FEAT_C_PORT_CONFIG_ERROR); |
4852 | } | |
1da177e4 | 4853 | |
5e467f6e AX |
4854 | /* Warm reset a USB3 protocol port if it's in |
4855 | * SS.Inactive state. | |
4856 | */ | |
8bea2bd3 | 4857 | if (hub_port_warm_reset_required(hub, portstatus)) { |
65bdac5e | 4858 | int status; |
d3b9d7a9 SS |
4859 | struct usb_device *udev = |
4860 | hub->ports[i - 1]->child; | |
65bdac5e | 4861 | |
5e467f6e | 4862 | dev_dbg(hub_dev, "warm reset port %d\n", i); |
2d51f3cd JW |
4863 | if (!udev || |
4864 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
4865 | udev->state == USB_STATE_NOTATTACHED) { | |
d3b9d7a9 SS |
4866 | status = hub_port_reset(hub, i, |
4867 | NULL, HUB_BH_RESET_TIME, | |
4868 | true); | |
4869 | if (status < 0) | |
4870 | hub_port_disable(hub, i, 1); | |
4871 | } else { | |
4872 | usb_lock_device(udev); | |
4873 | status = usb_reset_device(udev); | |
4874 | usb_unlock_device(udev); | |
f3e94aa1 | 4875 | connect_change = 0; |
d3b9d7a9 | 4876 | } |
5e467f6e AX |
4877 | } |
4878 | ||
1da177e4 LT |
4879 | if (connect_change) |
4880 | hub_port_connect_change(hub, i, | |
4881 | portstatus, portchange); | |
4882 | } /* end for i */ | |
4883 | ||
4884 | /* deal with hub status changes */ | |
4885 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
4886 | ; /* do nothing */ | |
4887 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
4888 | dev_err (hub_dev, "get_hub_status failed\n"); | |
4889 | else { | |
4890 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
4891 | dev_dbg (hub_dev, "power change\n"); | |
4892 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
55c52718 AS |
4893 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
4894 | /* FIXME: Is this always true? */ | |
55c52718 | 4895 | hub->limited_power = 1; |
403fae78 | 4896 | else |
4897 | hub->limited_power = 0; | |
1da177e4 LT |
4898 | } |
4899 | if (hubchange & HUB_CHANGE_OVERCURRENT) { | |
752d57a8 PB |
4900 | u16 status = 0; |
4901 | u16 unused; | |
4902 | ||
4903 | dev_dbg(hub_dev, "over-current change\n"); | |
1da177e4 | 4904 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); |
752d57a8 | 4905 | msleep(500); /* Cool down */ |
469271f8 | 4906 | hub_power_on(hub, true); |
752d57a8 PB |
4907 | hub_hub_status(hub, &status, &unused); |
4908 | if (status & HUB_STATUS_OVERCURRENT) | |
4909 | dev_err(hub_dev, "over-current " | |
4910 | "condition\n"); | |
1da177e4 LT |
4911 | } |
4912 | } | |
4913 | ||
8e4ceb38 AS |
4914 | loop_autopm: |
4915 | /* Balance the usb_autopm_get_interface() above */ | |
4916 | usb_autopm_put_interface_no_suspend(intf); | |
4917 | loop: | |
4918 | /* Balance the usb_autopm_get_interface_no_resume() in | |
4919 | * kick_khubd() and allow autosuspend. | |
4920 | */ | |
4921 | usb_autopm_put_interface(intf); | |
9bbdf1e0 | 4922 | loop_disconnected: |
1da177e4 | 4923 | usb_unlock_device(hdev); |
e8054854 | 4924 | kref_put(&hub->kref, hub_release); |
1da177e4 | 4925 | |
469271f8 | 4926 | } /* end while (1) */ |
1da177e4 LT |
4927 | } |
4928 | ||
4929 | static int hub_thread(void *__unused) | |
4930 | { | |
025d4430 | 4931 | /* khubd needs to be freezable to avoid interfering with USB-PERSIST |
3bb1af52 AS |
4932 | * port handover. Otherwise it might see that a full-speed device |
4933 | * was gone before the EHCI controller had handed its port over to | |
4934 | * the companion full-speed controller. | |
4935 | */ | |
83144186 | 4936 | set_freezable(); |
3bb1af52 | 4937 | |
1da177e4 LT |
4938 | do { |
4939 | hub_events(); | |
e42837bc | 4940 | wait_event_freezable(khubd_wait, |
9c8d6178 | 4941 | !list_empty(&hub_event_list) || |
4942 | kthread_should_stop()); | |
9c8d6178 | 4943 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
1da177e4 | 4944 | |
9c8d6178 | 4945 | pr_debug("%s: khubd exiting\n", usbcore_name); |
4946 | return 0; | |
1da177e4 LT |
4947 | } |
4948 | ||
1e927d96 | 4949 | static const struct usb_device_id hub_id_table[] = { |
e6f30dea | 4950 | { .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
469271f8 | 4951 | | USB_DEVICE_ID_MATCH_INT_CLASS, |
e6f30dea ML |
4952 | .idVendor = USB_VENDOR_GENESYS_LOGIC, |
4953 | .bInterfaceClass = USB_CLASS_HUB, | |
4954 | .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, | |
1da177e4 LT |
4955 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
4956 | .bDeviceClass = USB_CLASS_HUB}, | |
4957 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
4958 | .bInterfaceClass = USB_CLASS_HUB}, | |
4959 | { } /* Terminating entry */ | |
4960 | }; | |
4961 | ||
4962 | MODULE_DEVICE_TABLE (usb, hub_id_table); | |
4963 | ||
4964 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
4965 | .name = "hub", |
4966 | .probe = hub_probe, | |
4967 | .disconnect = hub_disconnect, | |
4968 | .suspend = hub_suspend, | |
4969 | .resume = hub_resume, | |
f07600cf | 4970 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
4971 | .pre_reset = hub_pre_reset, |
4972 | .post_reset = hub_post_reset, | |
c532b29a | 4973 | .unlocked_ioctl = hub_ioctl, |
1da177e4 | 4974 | .id_table = hub_id_table, |
40f122f3 | 4975 | .supports_autosuspend = 1, |
1da177e4 LT |
4976 | }; |
4977 | ||
4978 | int usb_hub_init(void) | |
4979 | { | |
1da177e4 LT |
4980 | if (usb_register(&hub_driver) < 0) { |
4981 | printk(KERN_ERR "%s: can't register hub driver\n", | |
4982 | usbcore_name); | |
4983 | return -1; | |
4984 | } | |
4985 | ||
9c8d6178 | 4986 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
4987 | if (!IS_ERR(khubd_task)) | |
1da177e4 | 4988 | return 0; |
1da177e4 LT |
4989 | |
4990 | /* Fall through if kernel_thread failed */ | |
4991 | usb_deregister(&hub_driver); | |
4992 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); | |
4993 | ||
4994 | return -1; | |
4995 | } | |
4996 | ||
4997 | void usb_hub_cleanup(void) | |
4998 | { | |
9c8d6178 | 4999 | kthread_stop(khubd_task); |
1da177e4 LT |
5000 | |
5001 | /* | |
5002 | * Hub resources are freed for us by usb_deregister. It calls | |
5003 | * usb_driver_purge on every device which in turn calls that | |
5004 | * devices disconnect function if it is using this driver. | |
5005 | * The hub_disconnect function takes care of releasing the | |
5006 | * individual hub resources. -greg | |
5007 | */ | |
5008 | usb_deregister(&hub_driver); | |
5009 | } /* usb_hub_cleanup() */ | |
5010 | ||
eb764c4b | 5011 | static int descriptors_changed(struct usb_device *udev, |
e3376d6c XR |
5012 | struct usb_device_descriptor *old_device_descriptor, |
5013 | struct usb_host_bos *old_bos) | |
eb764c4b AS |
5014 | { |
5015 | int changed = 0; | |
5016 | unsigned index; | |
5017 | unsigned serial_len = 0; | |
5018 | unsigned len; | |
5019 | unsigned old_length; | |
5020 | int length; | |
5021 | char *buf; | |
5022 | ||
5023 | if (memcmp(&udev->descriptor, old_device_descriptor, | |
5024 | sizeof(*old_device_descriptor)) != 0) | |
5025 | return 1; | |
5026 | ||
e3376d6c XR |
5027 | if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) |
5028 | return 1; | |
5029 | if (udev->bos) { | |
b9a10481 XR |
5030 | len = le16_to_cpu(udev->bos->desc->wTotalLength); |
5031 | if (len != le16_to_cpu(old_bos->desc->wTotalLength)) | |
e3376d6c | 5032 | return 1; |
b9a10481 | 5033 | if (memcmp(udev->bos->desc, old_bos->desc, len)) |
e3376d6c XR |
5034 | return 1; |
5035 | } | |
5036 | ||
eb764c4b AS |
5037 | /* Since the idVendor, idProduct, and bcdDevice values in the |
5038 | * device descriptor haven't changed, we will assume the | |
5039 | * Manufacturer and Product strings haven't changed either. | |
5040 | * But the SerialNumber string could be different (e.g., a | |
5041 | * different flash card of the same brand). | |
5042 | */ | |
5043 | if (udev->serial) | |
5044 | serial_len = strlen(udev->serial) + 1; | |
1da177e4 | 5045 | |
eb764c4b | 5046 | len = serial_len; |
1da177e4 | 5047 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b AS |
5048 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
5049 | len = max(len, old_length); | |
1da177e4 | 5050 | } |
eb764c4b | 5051 | |
0cc1a51f | 5052 | buf = kmalloc(len, GFP_NOIO); |
1da177e4 LT |
5053 | if (buf == NULL) { |
5054 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
5055 | /* assume the worst */ | |
5056 | return 1; | |
5057 | } | |
5058 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
eb764c4b | 5059 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
1da177e4 LT |
5060 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
5061 | old_length); | |
eb764c4b | 5062 | if (length != old_length) { |
1da177e4 LT |
5063 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
5064 | index, length); | |
eb764c4b | 5065 | changed = 1; |
1da177e4 LT |
5066 | break; |
5067 | } | |
5068 | if (memcmp (buf, udev->rawdescriptors[index], old_length) | |
5069 | != 0) { | |
5070 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
eb764c4b AS |
5071 | index, |
5072 | ((struct usb_config_descriptor *) buf)-> | |
5073 | bConfigurationValue); | |
5074 | changed = 1; | |
1da177e4 LT |
5075 | break; |
5076 | } | |
5077 | } | |
eb764c4b AS |
5078 | |
5079 | if (!changed && serial_len) { | |
5080 | length = usb_string(udev, udev->descriptor.iSerialNumber, | |
5081 | buf, serial_len); | |
5082 | if (length + 1 != serial_len) { | |
5083 | dev_dbg(&udev->dev, "serial string error %d\n", | |
5084 | length); | |
5085 | changed = 1; | |
5086 | } else if (memcmp(buf, udev->serial, length) != 0) { | |
5087 | dev_dbg(&udev->dev, "serial string changed\n"); | |
5088 | changed = 1; | |
5089 | } | |
5090 | } | |
5091 | ||
1da177e4 | 5092 | kfree(buf); |
eb764c4b | 5093 | return changed; |
1da177e4 LT |
5094 | } |
5095 | ||
5096 | /** | |
742120c6 | 5097 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
1da177e4 LT |
5098 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
5099 | * | |
79efa097 AS |
5100 | * WARNING - don't use this routine to reset a composite device |
5101 | * (one with multiple interfaces owned by separate drivers)! | |
742120c6 | 5102 | * Use usb_reset_device() instead. |
1da177e4 LT |
5103 | * |
5104 | * Do a port reset, reassign the device's address, and establish its | |
5105 | * former operating configuration. If the reset fails, or the device's | |
5106 | * descriptors change from their values before the reset, or the original | |
5107 | * configuration and altsettings cannot be restored, a flag will be set | |
5108 | * telling khubd to pretend the device has been disconnected and then | |
5109 | * re-connected. All drivers will be unbound, and the device will be | |
5110 | * re-enumerated and probed all over again. | |
5111 | * | |
626f090c | 5112 | * Return: 0 if the reset succeeded, -ENODEV if the device has been |
1da177e4 LT |
5113 | * flagged for logical disconnection, or some other negative error code |
5114 | * if the reset wasn't even attempted. | |
5115 | * | |
626f090c | 5116 | * Note: |
1da177e4 LT |
5117 | * The caller must own the device lock. For example, it's safe to use |
5118 | * this from a driver probe() routine after downloading new firmware. | |
5119 | * For calls that might not occur during probe(), drivers should lock | |
5120 | * the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
5121 | * |
5122 | * Locking exception: This routine may also be called from within an | |
5123 | * autoresume handler. Such usage won't conflict with other tasks | |
5124 | * holding the device lock because these tasks should always call | |
5125 | * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. | |
1da177e4 | 5126 | */ |
742120c6 | 5127 | static int usb_reset_and_verify_device(struct usb_device *udev) |
1da177e4 LT |
5128 | { |
5129 | struct usb_device *parent_hdev = udev->parent; | |
5130 | struct usb_hub *parent_hub; | |
3f0479e0 | 5131 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 5132 | struct usb_device_descriptor descriptor = udev->descriptor; |
e3376d6c | 5133 | struct usb_host_bos *bos; |
12c3da34 AS |
5134 | int i, ret = 0; |
5135 | int port1 = udev->portnum; | |
1da177e4 LT |
5136 | |
5137 | if (udev->state == USB_STATE_NOTATTACHED || | |
5138 | udev->state == USB_STATE_SUSPENDED) { | |
5139 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5140 | udev->state); | |
5141 | return -EINVAL; | |
5142 | } | |
5143 | ||
5144 | if (!parent_hdev) { | |
4bec9917 | 5145 | /* this requires hcd-specific logic; see ohci_restart() */ |
441b62c1 | 5146 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); |
1da177e4 LT |
5147 | return -EISDIR; |
5148 | } | |
ad493e5e | 5149 | parent_hub = usb_hub_to_struct_hub(parent_hdev); |
1da177e4 | 5150 | |
dcc01c08 SS |
5151 | /* Disable USB2 hardware LPM. |
5152 | * It will be re-enabled by the enumeration process. | |
5153 | */ | |
5154 | if (udev->usb2_hw_lpm_enabled == 1) | |
5155 | usb_set_usb2_hardware_lpm(udev, 0); | |
5156 | ||
e3376d6c XR |
5157 | bos = udev->bos; |
5158 | udev->bos = NULL; | |
5159 | ||
f74631e3 SS |
5160 | /* Disable LPM and LTM while we reset the device and reinstall the alt |
5161 | * settings. Device-initiated LPM settings, and system exit latency | |
5162 | * settings are cleared when the device is reset, so we have to set | |
5163 | * them up again. | |
6d1d0513 SS |
5164 | */ |
5165 | ret = usb_unlocked_disable_lpm(udev); | |
5166 | if (ret) { | |
5167 | dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); | |
5168 | goto re_enumerate; | |
5169 | } | |
f74631e3 SS |
5170 | ret = usb_disable_ltm(udev); |
5171 | if (ret) { | |
5172 | dev_err(&udev->dev, "%s Failed to disable LTM\n.", | |
5173 | __func__); | |
5174 | goto re_enumerate; | |
5175 | } | |
6d1d0513 | 5176 | |
1da177e4 LT |
5177 | set_bit(port1, parent_hub->busy_bits); |
5178 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { | |
5179 | ||
5180 | /* ep0 maxpacket size may change; let the HCD know about it. | |
5181 | * Other endpoints will be handled by re-enumeration. */ | |
fc721f51 | 5182 | usb_ep0_reinit(udev); |
1da177e4 | 5183 | ret = hub_port_init(parent_hub, udev, port1, i); |
dd4dd19e | 5184 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
5185 | break; |
5186 | } | |
5187 | clear_bit(port1, parent_hub->busy_bits); | |
d5cbad4b | 5188 | |
1da177e4 LT |
5189 | if (ret < 0) |
5190 | goto re_enumerate; | |
469271f8 | 5191 | |
1da177e4 | 5192 | /* Device might have changed firmware (DFU or similar) */ |
e3376d6c | 5193 | if (descriptors_changed(udev, &descriptor, bos)) { |
1da177e4 LT |
5194 | dev_info(&udev->dev, "device firmware changed\n"); |
5195 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
5196 | goto re_enumerate; | |
469271f8 | 5197 | } |
4fe0387a AS |
5198 | |
5199 | /* Restore the device's previous configuration */ | |
1da177e4 LT |
5200 | if (!udev->actconfig) |
5201 | goto done; | |
3f0479e0 | 5202 | |
d673bfcb | 5203 | mutex_lock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5204 | ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); |
5205 | if (ret < 0) { | |
5206 | dev_warn(&udev->dev, | |
5207 | "Busted HC? Not enough HCD resources for " | |
5208 | "old configuration.\n"); | |
d673bfcb | 5209 | mutex_unlock(hcd->bandwidth_mutex); |
3f0479e0 SS |
5210 | goto re_enumerate; |
5211 | } | |
1da177e4 LT |
5212 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
5213 | USB_REQ_SET_CONFIGURATION, 0, | |
5214 | udev->actconfig->desc.bConfigurationValue, 0, | |
5215 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
5216 | if (ret < 0) { | |
5217 | dev_err(&udev->dev, | |
5218 | "can't restore configuration #%d (error=%d)\n", | |
5219 | udev->actconfig->desc.bConfigurationValue, ret); | |
d673bfcb | 5220 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 | 5221 | goto re_enumerate; |
469271f8 | 5222 | } |
d673bfcb | 5223 | mutex_unlock(hcd->bandwidth_mutex); |
1da177e4 LT |
5224 | usb_set_device_state(udev, USB_STATE_CONFIGURED); |
5225 | ||
4fe0387a AS |
5226 | /* Put interfaces back into the same altsettings as before. |
5227 | * Don't bother to send the Set-Interface request for interfaces | |
5228 | * that were already in altsetting 0; besides being unnecessary, | |
5229 | * many devices can't handle it. Instead just reset the host-side | |
5230 | * endpoint state. | |
5231 | */ | |
1da177e4 | 5232 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
3f0479e0 SS |
5233 | struct usb_host_config *config = udev->actconfig; |
5234 | struct usb_interface *intf = config->interface[i]; | |
1da177e4 LT |
5235 | struct usb_interface_descriptor *desc; |
5236 | ||
1da177e4 | 5237 | desc = &intf->cur_altsetting->desc; |
4fe0387a AS |
5238 | if (desc->bAlternateSetting == 0) { |
5239 | usb_disable_interface(udev, intf, true); | |
5240 | usb_enable_interface(udev, intf, true); | |
5241 | ret = 0; | |
5242 | } else { | |
04a723ea SS |
5243 | /* Let the bandwidth allocation function know that this |
5244 | * device has been reset, and it will have to use | |
5245 | * alternate setting 0 as the current alternate setting. | |
3f0479e0 | 5246 | */ |
04a723ea | 5247 | intf->resetting_device = 1; |
4fe0387a AS |
5248 | ret = usb_set_interface(udev, desc->bInterfaceNumber, |
5249 | desc->bAlternateSetting); | |
04a723ea | 5250 | intf->resetting_device = 0; |
4fe0387a | 5251 | } |
1da177e4 LT |
5252 | if (ret < 0) { |
5253 | dev_err(&udev->dev, "failed to restore interface %d " | |
5254 | "altsetting %d (error=%d)\n", | |
5255 | desc->bInterfaceNumber, | |
5256 | desc->bAlternateSetting, | |
5257 | ret); | |
5258 | goto re_enumerate; | |
5259 | } | |
5260 | } | |
5261 | ||
5262 | done: | |
f74631e3 | 5263 | /* Now that the alt settings are re-installed, enable LTM and LPM. */ |
de68bab4 | 5264 | usb_set_usb2_hardware_lpm(udev, 1); |
8306095f | 5265 | usb_unlocked_enable_lpm(udev); |
f74631e3 | 5266 | usb_enable_ltm(udev); |
e3376d6c XR |
5267 | usb_release_bos_descriptor(udev); |
5268 | udev->bos = bos; | |
1da177e4 | 5269 | return 0; |
469271f8 | 5270 | |
1da177e4 | 5271 | re_enumerate: |
6d1d0513 | 5272 | /* LPM state doesn't matter when we're about to destroy the device. */ |
1da177e4 | 5273 | hub_port_logical_disconnect(parent_hub, port1); |
e3376d6c XR |
5274 | usb_release_bos_descriptor(udev); |
5275 | udev->bos = bos; | |
1da177e4 LT |
5276 | return -ENODEV; |
5277 | } | |
79efa097 AS |
5278 | |
5279 | /** | |
742120c6 | 5280 | * usb_reset_device - warn interface drivers and perform a USB port reset |
79efa097 | 5281 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
79efa097 AS |
5282 | * |
5283 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
5284 | * method), performs the port reset, and then lets the drivers know that | |
5285 | * the reset is over (using their post_reset method). | |
5286 | * | |
626f090c | 5287 | * Return: The same as for usb_reset_and_verify_device(). |
79efa097 | 5288 | * |
626f090c | 5289 | * Note: |
79efa097 AS |
5290 | * The caller must own the device lock. For example, it's safe to use |
5291 | * this from a driver probe() routine after downloading new firmware. | |
5292 | * For calls that might not occur during probe(), drivers should lock | |
5293 | * the device using usb_lock_device_for_reset(). | |
78d9a487 AS |
5294 | * |
5295 | * If an interface is currently being probed or disconnected, we assume | |
5296 | * its driver knows how to handle resets. For all other interfaces, | |
5297 | * if the driver doesn't have pre_reset and post_reset methods then | |
5298 | * we attempt to unbind it and rebind afterward. | |
79efa097 | 5299 | */ |
742120c6 | 5300 | int usb_reset_device(struct usb_device *udev) |
79efa097 AS |
5301 | { |
5302 | int ret; | |
852c4b43 | 5303 | int i; |
4d769def | 5304 | unsigned int noio_flag; |
79efa097 AS |
5305 | struct usb_host_config *config = udev->actconfig; |
5306 | ||
5307 | if (udev->state == USB_STATE_NOTATTACHED || | |
5308 | udev->state == USB_STATE_SUSPENDED) { | |
5309 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
5310 | udev->state); | |
5311 | return -EINVAL; | |
5312 | } | |
5313 | ||
4d769def ML |
5314 | /* |
5315 | * Don't allocate memory with GFP_KERNEL in current | |
5316 | * context to avoid possible deadlock if usb mass | |
5317 | * storage interface or usbnet interface(iSCSI case) | |
5318 | * is included in current configuration. The easist | |
5319 | * approach is to do it for every device reset, | |
5320 | * because the device 'memalloc_noio' flag may have | |
5321 | * not been set before reseting the usb device. | |
5322 | */ | |
5323 | noio_flag = memalloc_noio_save(); | |
5324 | ||
645daaab | 5325 | /* Prevent autosuspend during the reset */ |
94fcda1f | 5326 | usb_autoresume_device(udev); |
645daaab | 5327 | |
79efa097 | 5328 | if (config) { |
79efa097 | 5329 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
852c4b43 AS |
5330 | struct usb_interface *cintf = config->interface[i]; |
5331 | struct usb_driver *drv; | |
78d9a487 | 5332 | int unbind = 0; |
852c4b43 AS |
5333 | |
5334 | if (cintf->dev.driver) { | |
79efa097 | 5335 | drv = to_usb_driver(cintf->dev.driver); |
78d9a487 AS |
5336 | if (drv->pre_reset && drv->post_reset) |
5337 | unbind = (drv->pre_reset)(cintf); | |
5338 | else if (cintf->condition == | |
5339 | USB_INTERFACE_BOUND) | |
5340 | unbind = 1; | |
5341 | if (unbind) | |
5342 | usb_forced_unbind_intf(cintf); | |
79efa097 AS |
5343 | } |
5344 | } | |
5345 | } | |
5346 | ||
742120c6 | 5347 | ret = usb_reset_and_verify_device(udev); |
79efa097 AS |
5348 | |
5349 | if (config) { | |
79efa097 | 5350 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
852c4b43 AS |
5351 | struct usb_interface *cintf = config->interface[i]; |
5352 | struct usb_driver *drv; | |
78d9a487 | 5353 | int rebind = cintf->needs_binding; |
852c4b43 | 5354 | |
78d9a487 | 5355 | if (!rebind && cintf->dev.driver) { |
79efa097 AS |
5356 | drv = to_usb_driver(cintf->dev.driver); |
5357 | if (drv->post_reset) | |
78d9a487 AS |
5358 | rebind = (drv->post_reset)(cintf); |
5359 | else if (cintf->condition == | |
5360 | USB_INTERFACE_BOUND) | |
5361 | rebind = 1; | |
79efa097 | 5362 | } |
6c640945 | 5363 | if (ret == 0 && rebind) |
78d9a487 | 5364 | usb_rebind_intf(cintf); |
79efa097 AS |
5365 | } |
5366 | } | |
5367 | ||
94fcda1f | 5368 | usb_autosuspend_device(udev); |
4d769def | 5369 | memalloc_noio_restore(noio_flag); |
79efa097 AS |
5370 | return ret; |
5371 | } | |
742120c6 | 5372 | EXPORT_SYMBOL_GPL(usb_reset_device); |
dc023dce IPG |
5373 | |
5374 | ||
5375 | /** | |
5376 | * usb_queue_reset_device - Reset a USB device from an atomic context | |
5377 | * @iface: USB interface belonging to the device to reset | |
5378 | * | |
5379 | * This function can be used to reset a USB device from an atomic | |
5380 | * context, where usb_reset_device() won't work (as it blocks). | |
5381 | * | |
5382 | * Doing a reset via this method is functionally equivalent to calling | |
5383 | * usb_reset_device(), except for the fact that it is delayed to a | |
5384 | * workqueue. This means that any drivers bound to other interfaces | |
5385 | * might be unbound, as well as users from usbfs in user space. | |
5386 | * | |
5387 | * Corner cases: | |
5388 | * | |
5389 | * - Scheduling two resets at the same time from two different drivers | |
5390 | * attached to two different interfaces of the same device is | |
5391 | * possible; depending on how the driver attached to each interface | |
5392 | * handles ->pre_reset(), the second reset might happen or not. | |
5393 | * | |
5394 | * - If a driver is unbound and it had a pending reset, the reset will | |
5395 | * be cancelled. | |
5396 | * | |
5397 | * - This function can be called during .probe() or .disconnect() | |
5398 | * times. On return from .disconnect(), any pending resets will be | |
5399 | * cancelled. | |
5400 | * | |
5401 | * There is no no need to lock/unlock the @reset_ws as schedule_work() | |
5402 | * does its own. | |
5403 | * | |
5404 | * NOTE: We don't do any reference count tracking because it is not | |
5405 | * needed. The lifecycle of the work_struct is tied to the | |
5406 | * usb_interface. Before destroying the interface we cancel the | |
5407 | * work_struct, so the fact that work_struct is queued and or | |
5408 | * running means the interface (and thus, the device) exist and | |
5409 | * are referenced. | |
5410 | */ | |
5411 | void usb_queue_reset_device(struct usb_interface *iface) | |
5412 | { | |
5413 | schedule_work(&iface->reset_ws); | |
5414 | } | |
5415 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); | |
ff823c79 LT |
5416 | |
5417 | /** | |
5418 | * usb_hub_find_child - Get the pointer of child device | |
5419 | * attached to the port which is specified by @port1. | |
5420 | * @hdev: USB device belonging to the usb hub | |
5421 | * @port1: port num to indicate which port the child device | |
5422 | * is attached to. | |
5423 | * | |
5424 | * USB drivers call this function to get hub's child device | |
5425 | * pointer. | |
5426 | * | |
626f090c | 5427 | * Return: %NULL if input param is invalid and |
ff823c79 LT |
5428 | * child's usb_device pointer if non-NULL. |
5429 | */ | |
5430 | struct usb_device *usb_hub_find_child(struct usb_device *hdev, | |
5431 | int port1) | |
5432 | { | |
ad493e5e | 5433 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
ff823c79 LT |
5434 | |
5435 | if (port1 < 1 || port1 > hdev->maxchild) | |
5436 | return NULL; | |
5437 | return hub->ports[port1 - 1]->child; | |
5438 | } | |
5439 | EXPORT_SYMBOL_GPL(usb_hub_find_child); | |
d5575424 | 5440 | |
05f91689 LT |
5441 | /** |
5442 | * usb_set_hub_port_connect_type - set hub port connect type. | |
5443 | * @hdev: USB device belonging to the usb hub | |
5444 | * @port1: port num of the port | |
5445 | * @type: connect type of the port | |
5446 | */ | |
5447 | void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1, | |
5448 | enum usb_port_connect_type type) | |
5449 | { | |
ad493e5e | 5450 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
05f91689 | 5451 | |
41341261 MN |
5452 | if (hub) |
5453 | hub->ports[port1 - 1]->connect_type = type; | |
05f91689 LT |
5454 | } |
5455 | ||
5456 | /** | |
5457 | * usb_get_hub_port_connect_type - Get the port's connect type | |
5458 | * @hdev: USB device belonging to the usb hub | |
5459 | * @port1: port num of the port | |
5460 | * | |
626f090c YB |
5461 | * Return: The connect type of the port if successful. Or |
5462 | * USB_PORT_CONNECT_TYPE_UNKNOWN if input params are invalid. | |
05f91689 LT |
5463 | */ |
5464 | enum usb_port_connect_type | |
5465 | usb_get_hub_port_connect_type(struct usb_device *hdev, int port1) | |
5466 | { | |
ad493e5e | 5467 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
05f91689 | 5468 | |
41341261 MN |
5469 | if (!hub) |
5470 | return USB_PORT_CONNECT_TYPE_UNKNOWN; | |
5471 | ||
05f91689 LT |
5472 | return hub->ports[port1 - 1]->connect_type; |
5473 | } | |
5474 | ||
d2123fd9 LT |
5475 | void usb_hub_adjust_deviceremovable(struct usb_device *hdev, |
5476 | struct usb_hub_descriptor *desc) | |
5477 | { | |
5478 | enum usb_port_connect_type connect_type; | |
5479 | int i; | |
5480 | ||
5481 | if (!hub_is_superspeed(hdev)) { | |
5482 | for (i = 1; i <= hdev->maxchild; i++) { | |
5483 | connect_type = usb_get_hub_port_connect_type(hdev, i); | |
5484 | ||
5485 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { | |
5486 | u8 mask = 1 << (i%8); | |
5487 | ||
5488 | if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { | |
5489 | dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", | |
5490 | i); | |
5491 | desc->u.hs.DeviceRemovable[i/8] |= mask; | |
5492 | } | |
5493 | } | |
5494 | } | |
5495 | } else { | |
5496 | u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); | |
5497 | ||
5498 | for (i = 1; i <= hdev->maxchild; i++) { | |
5499 | connect_type = usb_get_hub_port_connect_type(hdev, i); | |
5500 | ||
5501 | if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { | |
5502 | u16 mask = 1 << i; | |
5503 | ||
5504 | if (!(port_removable & mask)) { | |
5505 | dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", | |
5506 | i); | |
5507 | port_removable |= mask; | |
5508 | } | |
5509 | } | |
5510 | } | |
5511 | ||
5512 | desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); | |
5513 | } | |
5514 | } | |
5515 | ||
d5575424 LT |
5516 | #ifdef CONFIG_ACPI |
5517 | /** | |
5518 | * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle | |
5519 | * @hdev: USB device belonging to the usb hub | |
5520 | * @port1: port num of the port | |
5521 | * | |
626f090c YB |
5522 | * Return: Port's acpi handle if successful, %NULL if params are |
5523 | * invalid. | |
d5575424 LT |
5524 | */ |
5525 | acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, | |
5526 | int port1) | |
5527 | { | |
ad493e5e | 5528 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
d5575424 | 5529 | |
41341261 MN |
5530 | if (!hub) |
5531 | return NULL; | |
5532 | ||
3a83f992 | 5533 | return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); |
d5575424 LT |
5534 | } |
5535 | #endif |