Commit | Line | Data |
---|---|---|
ddae41be GKH |
1 | /* |
2 | * drivers/usb/driver.c - most of the driver model stuff for usb | |
3 | * | |
4 | * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de> | |
5 | * | |
6 | * based on drivers/usb/usb.c which had the following copyrights: | |
7 | * (C) Copyright Linus Torvalds 1999 | |
8 | * (C) Copyright Johannes Erdfelt 1999-2001 | |
9 | * (C) Copyright Andreas Gal 1999 | |
10 | * (C) Copyright Gregory P. Smith 1999 | |
11 | * (C) Copyright Deti Fliegl 1999 (new USB architecture) | |
12 | * (C) Copyright Randy Dunlap 2000 | |
13 | * (C) Copyright David Brownell 2000-2004 | |
14 | * (C) Copyright Yggdrasil Computing, Inc. 2000 | |
15 | * (usb_device_id matching changes by Adam J. Richter) | |
16 | * (C) Copyright Greg Kroah-Hartman 2002-2003 | |
17 | * | |
18 | * NOTE! This is not actually a driver at all, rather this is | |
19 | * just a collection of helper routines that implement the | |
36e56a34 AS |
20 | * matching, probing, releasing, suspending and resuming for |
21 | * real drivers. | |
ddae41be GKH |
22 | * |
23 | */ | |
24 | ||
ddae41be GKH |
25 | #include <linux/device.h> |
26 | #include <linux/usb.h> | |
6bc6cff5 | 27 | #include <linux/usb/quirks.h> |
9bbdf1e0 | 28 | #include <linux/pm_runtime.h> |
ddae41be GKH |
29 | #include "hcd.h" |
30 | #include "usb.h" | |
31 | ||
20dfdad7 | 32 | |
733260ff GKH |
33 | #ifdef CONFIG_HOTPLUG |
34 | ||
35 | /* | |
36 | * Adds a new dynamic USBdevice ID to this driver, | |
37 | * and cause the driver to probe for all devices again. | |
38 | */ | |
93bacefc GKH |
39 | ssize_t usb_store_new_id(struct usb_dynids *dynids, |
40 | struct device_driver *driver, | |
41 | const char *buf, size_t count) | |
733260ff | 42 | { |
733260ff GKH |
43 | struct usb_dynid *dynid; |
44 | u32 idVendor = 0; | |
45 | u32 idProduct = 0; | |
46 | int fields = 0; | |
1b21d5e1 | 47 | int retval = 0; |
733260ff GKH |
48 | |
49 | fields = sscanf(buf, "%x %x", &idVendor, &idProduct); | |
50 | if (fields < 2) | |
51 | return -EINVAL; | |
52 | ||
53 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
54 | if (!dynid) | |
55 | return -ENOMEM; | |
56 | ||
57 | INIT_LIST_HEAD(&dynid->node); | |
58 | dynid->id.idVendor = idVendor; | |
59 | dynid->id.idProduct = idProduct; | |
60 | dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE; | |
61 | ||
93bacefc | 62 | spin_lock(&dynids->lock); |
e5dd0115 | 63 | list_add_tail(&dynid->node, &dynids->list); |
93bacefc | 64 | spin_unlock(&dynids->lock); |
733260ff GKH |
65 | |
66 | if (get_driver(driver)) { | |
1b21d5e1 | 67 | retval = driver_attach(driver); |
733260ff GKH |
68 | put_driver(driver); |
69 | } | |
70 | ||
1b21d5e1 GKH |
71 | if (retval) |
72 | return retval; | |
733260ff GKH |
73 | return count; |
74 | } | |
93bacefc GKH |
75 | EXPORT_SYMBOL_GPL(usb_store_new_id); |
76 | ||
77 | static ssize_t store_new_id(struct device_driver *driver, | |
78 | const char *buf, size_t count) | |
79 | { | |
80 | struct usb_driver *usb_drv = to_usb_driver(driver); | |
81 | ||
82 | return usb_store_new_id(&usb_drv->dynids, driver, buf, count); | |
83 | } | |
733260ff GKH |
84 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); |
85 | ||
0c7a2b72 CR |
86 | /** |
87 | * store_remove_id - remove a USB device ID from this driver | |
88 | * @driver: target device driver | |
89 | * @buf: buffer for scanning device ID data | |
90 | * @count: input size | |
91 | * | |
92 | * Removes a dynamic usb device ID from this driver. | |
93 | */ | |
94 | static ssize_t | |
95 | store_remove_id(struct device_driver *driver, const char *buf, size_t count) | |
96 | { | |
97 | struct usb_dynid *dynid, *n; | |
98 | struct usb_driver *usb_driver = to_usb_driver(driver); | |
99 | u32 idVendor = 0; | |
100 | u32 idProduct = 0; | |
101 | int fields = 0; | |
102 | int retval = 0; | |
103 | ||
104 | fields = sscanf(buf, "%x %x", &idVendor, &idProduct); | |
105 | if (fields < 2) | |
106 | return -EINVAL; | |
107 | ||
108 | spin_lock(&usb_driver->dynids.lock); | |
109 | list_for_each_entry_safe(dynid, n, &usb_driver->dynids.list, node) { | |
110 | struct usb_device_id *id = &dynid->id; | |
111 | if ((id->idVendor == idVendor) && | |
112 | (id->idProduct == idProduct)) { | |
113 | list_del(&dynid->node); | |
114 | kfree(dynid); | |
115 | retval = 0; | |
116 | break; | |
117 | } | |
118 | } | |
119 | spin_unlock(&usb_driver->dynids.lock); | |
120 | ||
121 | if (retval) | |
122 | return retval; | |
123 | return count; | |
124 | } | |
125 | static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id); | |
126 | ||
733260ff GKH |
127 | static int usb_create_newid_file(struct usb_driver *usb_drv) |
128 | { | |
129 | int error = 0; | |
130 | ||
ba9dc657 GKH |
131 | if (usb_drv->no_dynamic_id) |
132 | goto exit; | |
133 | ||
733260ff | 134 | if (usb_drv->probe != NULL) |
15147ffd GKH |
135 | error = driver_create_file(&usb_drv->drvwrap.driver, |
136 | &driver_attr_new_id); | |
ba9dc657 | 137 | exit: |
733260ff GKH |
138 | return error; |
139 | } | |
140 | ||
ba9dc657 GKH |
141 | static void usb_remove_newid_file(struct usb_driver *usb_drv) |
142 | { | |
143 | if (usb_drv->no_dynamic_id) | |
144 | return; | |
145 | ||
146 | if (usb_drv->probe != NULL) | |
15147ffd GKH |
147 | driver_remove_file(&usb_drv->drvwrap.driver, |
148 | &driver_attr_new_id); | |
ba9dc657 GKH |
149 | } |
150 | ||
0c7a2b72 CR |
151 | static int |
152 | usb_create_removeid_file(struct usb_driver *drv) | |
153 | { | |
154 | int error = 0; | |
155 | if (drv->probe != NULL) | |
156 | error = driver_create_file(&drv->drvwrap.driver, | |
157 | &driver_attr_remove_id); | |
158 | return error; | |
159 | } | |
160 | ||
161 | static void usb_remove_removeid_file(struct usb_driver *drv) | |
162 | { | |
163 | driver_remove_file(&drv->drvwrap.driver, &driver_attr_remove_id); | |
164 | } | |
165 | ||
733260ff GKH |
166 | static void usb_free_dynids(struct usb_driver *usb_drv) |
167 | { | |
168 | struct usb_dynid *dynid, *n; | |
169 | ||
170 | spin_lock(&usb_drv->dynids.lock); | |
171 | list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) { | |
172 | list_del(&dynid->node); | |
173 | kfree(dynid); | |
174 | } | |
175 | spin_unlock(&usb_drv->dynids.lock); | |
176 | } | |
177 | #else | |
178 | static inline int usb_create_newid_file(struct usb_driver *usb_drv) | |
179 | { | |
180 | return 0; | |
181 | } | |
182 | ||
ba9dc657 GKH |
183 | static void usb_remove_newid_file(struct usb_driver *usb_drv) |
184 | { | |
185 | } | |
186 | ||
0c7a2b72 CR |
187 | static int |
188 | usb_create_removeid_file(struct usb_driver *drv) | |
189 | { | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static void usb_remove_removeid_file(struct usb_driver *drv) | |
194 | { | |
195 | } | |
196 | ||
733260ff GKH |
197 | static inline void usb_free_dynids(struct usb_driver *usb_drv) |
198 | { | |
199 | } | |
200 | #endif | |
201 | ||
202 | static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf, | |
203 | struct usb_driver *drv) | |
204 | { | |
205 | struct usb_dynid *dynid; | |
206 | ||
207 | spin_lock(&drv->dynids.lock); | |
208 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
209 | if (usb_match_one_id(intf, &dynid->id)) { | |
210 | spin_unlock(&drv->dynids.lock); | |
211 | return &dynid->id; | |
212 | } | |
213 | } | |
214 | spin_unlock(&drv->dynids.lock); | |
215 | return NULL; | |
216 | } | |
217 | ||
218 | ||
8bb54ab5 AS |
219 | /* called from driver core with dev locked */ |
220 | static int usb_probe_device(struct device *dev) | |
221 | { | |
222 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); | |
55129666 | 223 | struct usb_device *udev = to_usb_device(dev); |
9bbdf1e0 | 224 | int error = 0; |
8bb54ab5 | 225 | |
441b62c1 | 226 | dev_dbg(dev, "%s\n", __func__); |
8bb54ab5 | 227 | |
8bb54ab5 AS |
228 | /* TODO: Add real matching code */ |
229 | ||
645daaab AS |
230 | /* The device should always appear to be in use |
231 | * unless the driver suports autosuspend. | |
232 | */ | |
9bbdf1e0 AS |
233 | if (!udriver->supports_autosuspend) |
234 | error = usb_autoresume_device(udev); | |
645daaab | 235 | |
9bbdf1e0 AS |
236 | if (!error) |
237 | error = udriver->probe(udev); | |
8bb54ab5 AS |
238 | return error; |
239 | } | |
240 | ||
241 | /* called from driver core with dev locked */ | |
242 | static int usb_unbind_device(struct device *dev) | |
243 | { | |
9bbdf1e0 | 244 | struct usb_device *udev = to_usb_device(dev); |
8bb54ab5 AS |
245 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); |
246 | ||
9bbdf1e0 AS |
247 | udriver->disconnect(udev); |
248 | if (!udriver->supports_autosuspend) | |
249 | usb_autosuspend_device(udev); | |
8bb54ab5 AS |
250 | return 0; |
251 | } | |
252 | ||
dc023dce IPG |
253 | /* |
254 | * Cancel any pending scheduled resets | |
255 | * | |
256 | * [see usb_queue_reset_device()] | |
257 | * | |
258 | * Called after unconfiguring / when releasing interfaces. See | |
259 | * comments in __usb_queue_reset_device() regarding | |
260 | * udev->reset_running. | |
261 | */ | |
262 | static void usb_cancel_queued_reset(struct usb_interface *iface) | |
263 | { | |
264 | if (iface->reset_running == 0) | |
265 | cancel_work_sync(&iface->reset_ws); | |
266 | } | |
8bb54ab5 AS |
267 | |
268 | /* called from driver core with dev locked */ | |
ddae41be GKH |
269 | static int usb_probe_interface(struct device *dev) |
270 | { | |
8bb54ab5 | 271 | struct usb_driver *driver = to_usb_driver(dev->driver); |
55129666 KS |
272 | struct usb_interface *intf = to_usb_interface(dev); |
273 | struct usb_device *udev = interface_to_usbdev(intf); | |
ddae41be GKH |
274 | const struct usb_device_id *id; |
275 | int error = -ENODEV; | |
276 | ||
441b62c1 | 277 | dev_dbg(dev, "%s\n", __func__); |
ddae41be | 278 | |
78d9a487 | 279 | intf->needs_binding = 0; |
ddae41be | 280 | |
7cbe5dca | 281 | if (usb_device_is_owned(udev)) |
0f3dda9f | 282 | return error; |
7cbe5dca | 283 | |
2c044a48 GKH |
284 | if (udev->authorized == 0) { |
285 | dev_err(&intf->dev, "Device is not authorized for usage\n"); | |
0f3dda9f | 286 | return error; |
2c044a48 | 287 | } |
72230abb | 288 | |
ddae41be | 289 | id = usb_match_id(intf, driver->id_table); |
733260ff GKH |
290 | if (!id) |
291 | id = usb_match_dynamic_id(intf, driver); | |
0f3dda9f AS |
292 | if (!id) |
293 | return error; | |
55151d7d | 294 | |
0f3dda9f AS |
295 | dev_dbg(dev, "%s - got id\n", __func__); |
296 | ||
297 | error = usb_autoresume_device(udev); | |
298 | if (error) | |
299 | return error; | |
300 | ||
0f3dda9f | 301 | intf->condition = USB_INTERFACE_BINDING; |
645daaab | 302 | |
9bbdf1e0 AS |
303 | /* Bound interfaces are initially active. They are |
304 | * runtime-PM-enabled only if the driver has autosuspend support. | |
305 | * They are sensitive to their children's power states. | |
0f3dda9f | 306 | */ |
9bbdf1e0 AS |
307 | pm_runtime_set_active(dev); |
308 | pm_suspend_ignore_children(dev, false); | |
309 | if (driver->supports_autosuspend) | |
310 | pm_runtime_enable(dev); | |
0f3dda9f AS |
311 | |
312 | /* Carry out a deferred switch to altsetting 0 */ | |
313 | if (intf->needs_altsetting0) { | |
314 | error = usb_set_interface(udev, intf->altsetting[0]. | |
315 | desc.bInterfaceNumber, 0); | |
316 | if (error < 0) | |
317 | goto err; | |
318 | intf->needs_altsetting0 = 0; | |
ddae41be GKH |
319 | } |
320 | ||
0f3dda9f AS |
321 | error = driver->probe(intf, id); |
322 | if (error) | |
323 | goto err; | |
324 | ||
325 | intf->condition = USB_INTERFACE_BOUND; | |
326 | usb_autosuspend_device(udev); | |
ddae41be | 327 | return error; |
1e5ea5e3 | 328 | |
0f3dda9f | 329 | err: |
1e5ea5e3 ON |
330 | intf->needs_remote_wakeup = 0; |
331 | intf->condition = USB_INTERFACE_UNBOUND; | |
332 | usb_cancel_queued_reset(intf); | |
9bbdf1e0 AS |
333 | |
334 | /* Unbound interfaces are always runtime-PM-disabled and -suspended */ | |
335 | pm_runtime_disable(dev); | |
336 | pm_runtime_set_suspended(dev); | |
337 | ||
1e5ea5e3 ON |
338 | usb_autosuspend_device(udev); |
339 | return error; | |
ddae41be GKH |
340 | } |
341 | ||
8bb54ab5 | 342 | /* called from driver core with dev locked */ |
ddae41be GKH |
343 | static int usb_unbind_interface(struct device *dev) |
344 | { | |
8bb54ab5 | 345 | struct usb_driver *driver = to_usb_driver(dev->driver); |
ddae41be | 346 | struct usb_interface *intf = to_usb_interface(dev); |
645daaab | 347 | struct usb_device *udev; |
1e5ea5e3 | 348 | int error, r; |
ddae41be GKH |
349 | |
350 | intf->condition = USB_INTERFACE_UNBINDING; | |
351 | ||
645daaab AS |
352 | /* Autoresume for set_interface call below */ |
353 | udev = interface_to_usbdev(intf); | |
94fcda1f | 354 | error = usb_autoresume_device(udev); |
645daaab | 355 | |
9da82bd4 AS |
356 | /* Terminate all URBs for this interface unless the driver |
357 | * supports "soft" unbinding. | |
358 | */ | |
359 | if (!driver->soft_unbind) | |
ddeac4e7 | 360 | usb_disable_interface(udev, intf, false); |
ddae41be | 361 | |
8bb54ab5 | 362 | driver->disconnect(intf); |
dc023dce | 363 | usb_cancel_queued_reset(intf); |
ddae41be | 364 | |
55151d7d AS |
365 | /* Reset other interface state. |
366 | * We cannot do a Set-Interface if the device is suspended or | |
367 | * if it is prepared for a system sleep (since installing a new | |
368 | * altsetting means creating new endpoint device entries). | |
369 | * When either of these happens, defer the Set-Interface. | |
370 | */ | |
2caf7fcd AS |
371 | if (intf->cur_altsetting->desc.bAlternateSetting == 0) { |
372 | /* Already in altsetting 0 so skip Set-Interface. | |
373 | * Just re-enable it without affecting the endpoint toggles. | |
374 | */ | |
375 | usb_enable_interface(udev, intf, false); | |
1e5ea5e3 ON |
376 | } else if (!error && intf->dev.power.status == DPM_ON) { |
377 | r = usb_set_interface(udev, intf->altsetting[0]. | |
55151d7d | 378 | desc.bInterfaceNumber, 0); |
1e5ea5e3 ON |
379 | if (r < 0) |
380 | intf->needs_altsetting0 = 1; | |
381 | } else { | |
55151d7d | 382 | intf->needs_altsetting0 = 1; |
1e5ea5e3 | 383 | } |
ddae41be | 384 | usb_set_intfdata(intf, NULL); |
645daaab | 385 | |
ddae41be | 386 | intf->condition = USB_INTERFACE_UNBOUND; |
645daaab AS |
387 | intf->needs_remote_wakeup = 0; |
388 | ||
9bbdf1e0 AS |
389 | /* Unbound interfaces are always runtime-PM-disabled and -suspended */ |
390 | pm_runtime_disable(dev); | |
391 | pm_runtime_set_suspended(dev); | |
392 | ||
393 | /* Undo any residual pm_autopm_get_interface_* calls */ | |
394 | for (r = atomic_read(&intf->pm_usage_cnt); r > 0; --r) | |
395 | usb_autopm_put_interface_no_suspend(intf); | |
396 | atomic_set(&intf->pm_usage_cnt, 0); | |
397 | ||
645daaab | 398 | if (!error) |
94fcda1f | 399 | usb_autosuspend_device(udev); |
ddae41be GKH |
400 | |
401 | return 0; | |
402 | } | |
403 | ||
36e56a34 AS |
404 | /** |
405 | * usb_driver_claim_interface - bind a driver to an interface | |
406 | * @driver: the driver to be bound | |
407 | * @iface: the interface to which it will be bound; must be in the | |
408 | * usb device's active configuration | |
409 | * @priv: driver data associated with that interface | |
410 | * | |
411 | * This is used by usb device drivers that need to claim more than one | |
412 | * interface on a device when probing (audio and acm are current examples). | |
413 | * No device driver should directly modify internal usb_interface or | |
414 | * usb_device structure members. | |
415 | * | |
416 | * Few drivers should need to use this routine, since the most natural | |
417 | * way to bind to an interface is to return the private data from | |
418 | * the driver's probe() method. | |
419 | * | |
341487a8 GKH |
420 | * Callers must own the device lock, so driver probe() entries don't need |
421 | * extra locking, but other call contexts may need to explicitly claim that | |
422 | * lock. | |
36e56a34 AS |
423 | */ |
424 | int usb_driver_claim_interface(struct usb_driver *driver, | |
2c044a48 | 425 | struct usb_interface *iface, void *priv) |
36e56a34 AS |
426 | { |
427 | struct device *dev = &iface->dev; | |
1b21d5e1 | 428 | int retval = 0; |
36e56a34 AS |
429 | |
430 | if (dev->driver) | |
431 | return -EBUSY; | |
432 | ||
8bb54ab5 | 433 | dev->driver = &driver->drvwrap.driver; |
36e56a34 | 434 | usb_set_intfdata(iface, priv); |
78d9a487 | 435 | iface->needs_binding = 0; |
645daaab | 436 | |
36e56a34 | 437 | iface->condition = USB_INTERFACE_BOUND; |
9bbdf1e0 AS |
438 | |
439 | /* Bound interfaces are initially active. They are | |
440 | * runtime-PM-enabled only if the driver has autosuspend support. | |
441 | * They are sensitive to their children's power states. | |
442 | */ | |
443 | pm_runtime_set_active(dev); | |
444 | pm_suspend_ignore_children(dev, false); | |
445 | if (driver->supports_autosuspend) | |
446 | pm_runtime_enable(dev); | |
36e56a34 AS |
447 | |
448 | /* if interface was already added, bind now; else let | |
449 | * the future device_add() bind it, bypassing probe() | |
450 | */ | |
451 | if (device_is_registered(dev)) | |
1b21d5e1 | 452 | retval = device_bind_driver(dev); |
36e56a34 | 453 | |
1b21d5e1 | 454 | return retval; |
36e56a34 | 455 | } |
782e70c6 | 456 | EXPORT_SYMBOL_GPL(usb_driver_claim_interface); |
36e56a34 AS |
457 | |
458 | /** | |
459 | * usb_driver_release_interface - unbind a driver from an interface | |
460 | * @driver: the driver to be unbound | |
461 | * @iface: the interface from which it will be unbound | |
462 | * | |
463 | * This can be used by drivers to release an interface without waiting | |
464 | * for their disconnect() methods to be called. In typical cases this | |
465 | * also causes the driver disconnect() method to be called. | |
466 | * | |
467 | * This call is synchronous, and may not be used in an interrupt context. | |
341487a8 GKH |
468 | * Callers must own the device lock, so driver disconnect() entries don't |
469 | * need extra locking, but other call contexts may need to explicitly claim | |
470 | * that lock. | |
36e56a34 AS |
471 | */ |
472 | void usb_driver_release_interface(struct usb_driver *driver, | |
473 | struct usb_interface *iface) | |
474 | { | |
475 | struct device *dev = &iface->dev; | |
476 | ||
477 | /* this should never happen, don't release something that's not ours */ | |
8bb54ab5 | 478 | if (!dev->driver || dev->driver != &driver->drvwrap.driver) |
36e56a34 AS |
479 | return; |
480 | ||
481 | /* don't release from within disconnect() */ | |
482 | if (iface->condition != USB_INTERFACE_BOUND) | |
483 | return; | |
91f8d063 | 484 | iface->condition = USB_INTERFACE_UNBINDING; |
36e56a34 | 485 | |
91f8d063 AS |
486 | /* Release via the driver core only if the interface |
487 | * has already been registered | |
488 | */ | |
36e56a34 | 489 | if (device_is_registered(dev)) { |
36e56a34 | 490 | device_release_driver(dev); |
dc023dce | 491 | } else { |
8e9394ce | 492 | device_lock(dev); |
91f8d063 AS |
493 | usb_unbind_interface(dev); |
494 | dev->driver = NULL; | |
8e9394ce | 495 | device_unlock(dev); |
36e56a34 | 496 | } |
36e56a34 | 497 | } |
782e70c6 | 498 | EXPORT_SYMBOL_GPL(usb_driver_release_interface); |
36e56a34 | 499 | |
733260ff | 500 | /* returns 0 if no match, 1 if match */ |
bb417020 | 501 | int usb_match_device(struct usb_device *dev, const struct usb_device_id *id) |
733260ff | 502 | { |
733260ff GKH |
503 | if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && |
504 | id->idVendor != le16_to_cpu(dev->descriptor.idVendor)) | |
505 | return 0; | |
506 | ||
507 | if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && | |
508 | id->idProduct != le16_to_cpu(dev->descriptor.idProduct)) | |
509 | return 0; | |
510 | ||
511 | /* No need to test id->bcdDevice_lo != 0, since 0 is never | |
512 | greater than any unsigned number. */ | |
513 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) && | |
514 | (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice))) | |
515 | return 0; | |
516 | ||
517 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && | |
518 | (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice))) | |
519 | return 0; | |
520 | ||
521 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) && | |
522 | (id->bDeviceClass != dev->descriptor.bDeviceClass)) | |
523 | return 0; | |
524 | ||
525 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) && | |
2c044a48 | 526 | (id->bDeviceSubClass != dev->descriptor.bDeviceSubClass)) |
733260ff GKH |
527 | return 0; |
528 | ||
529 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) && | |
530 | (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol)) | |
531 | return 0; | |
532 | ||
bb417020 GKH |
533 | return 1; |
534 | } | |
535 | ||
536 | /* returns 0 if no match, 1 if match */ | |
537 | int usb_match_one_id(struct usb_interface *interface, | |
538 | const struct usb_device_id *id) | |
539 | { | |
540 | struct usb_host_interface *intf; | |
541 | struct usb_device *dev; | |
542 | ||
543 | /* proc_connectinfo in devio.c may call us with id == NULL. */ | |
544 | if (id == NULL) | |
545 | return 0; | |
546 | ||
547 | intf = interface->cur_altsetting; | |
548 | dev = interface_to_usbdev(interface); | |
549 | ||
550 | if (!usb_match_device(dev, id)) | |
551 | return 0; | |
552 | ||
93c8bf45 AS |
553 | /* The interface class, subclass, and protocol should never be |
554 | * checked for a match if the device class is Vendor Specific, | |
555 | * unless the match record specifies the Vendor ID. */ | |
556 | if (dev->descriptor.bDeviceClass == USB_CLASS_VENDOR_SPEC && | |
557 | !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && | |
558 | (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS | | |
559 | USB_DEVICE_ID_MATCH_INT_SUBCLASS | | |
560 | USB_DEVICE_ID_MATCH_INT_PROTOCOL))) | |
561 | return 0; | |
562 | ||
733260ff GKH |
563 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) && |
564 | (id->bInterfaceClass != intf->desc.bInterfaceClass)) | |
565 | return 0; | |
566 | ||
567 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && | |
568 | (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass)) | |
569 | return 0; | |
570 | ||
571 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && | |
572 | (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol)) | |
573 | return 0; | |
574 | ||
575 | return 1; | |
576 | } | |
93bacefc GKH |
577 | EXPORT_SYMBOL_GPL(usb_match_one_id); |
578 | ||
ddae41be GKH |
579 | /** |
580 | * usb_match_id - find first usb_device_id matching device or interface | |
581 | * @interface: the interface of interest | |
582 | * @id: array of usb_device_id structures, terminated by zero entry | |
583 | * | |
584 | * usb_match_id searches an array of usb_device_id's and returns | |
585 | * the first one matching the device or interface, or null. | |
586 | * This is used when binding (or rebinding) a driver to an interface. | |
587 | * Most USB device drivers will use this indirectly, through the usb core, | |
588 | * but some layered driver frameworks use it directly. | |
589 | * These device tables are exported with MODULE_DEVICE_TABLE, through | |
590 | * modutils, to support the driver loading functionality of USB hotplugging. | |
591 | * | |
592 | * What Matches: | |
593 | * | |
594 | * The "match_flags" element in a usb_device_id controls which | |
595 | * members are used. If the corresponding bit is set, the | |
596 | * value in the device_id must match its corresponding member | |
597 | * in the device or interface descriptor, or else the device_id | |
598 | * does not match. | |
599 | * | |
600 | * "driver_info" is normally used only by device drivers, | |
601 | * but you can create a wildcard "matches anything" usb_device_id | |
602 | * as a driver's "modules.usbmap" entry if you provide an id with | |
603 | * only a nonzero "driver_info" field. If you do this, the USB device | |
604 | * driver's probe() routine should use additional intelligence to | |
605 | * decide whether to bind to the specified interface. | |
606 | * | |
607 | * What Makes Good usb_device_id Tables: | |
608 | * | |
609 | * The match algorithm is very simple, so that intelligence in | |
610 | * driver selection must come from smart driver id records. | |
611 | * Unless you have good reasons to use another selection policy, | |
612 | * provide match elements only in related groups, and order match | |
613 | * specifiers from specific to general. Use the macros provided | |
614 | * for that purpose if you can. | |
615 | * | |
616 | * The most specific match specifiers use device descriptor | |
617 | * data. These are commonly used with product-specific matches; | |
618 | * the USB_DEVICE macro lets you provide vendor and product IDs, | |
619 | * and you can also match against ranges of product revisions. | |
620 | * These are widely used for devices with application or vendor | |
621 | * specific bDeviceClass values. | |
622 | * | |
623 | * Matches based on device class/subclass/protocol specifications | |
624 | * are slightly more general; use the USB_DEVICE_INFO macro, or | |
625 | * its siblings. These are used with single-function devices | |
626 | * where bDeviceClass doesn't specify that each interface has | |
627 | * its own class. | |
628 | * | |
629 | * Matches based on interface class/subclass/protocol are the | |
630 | * most general; they let drivers bind to any interface on a | |
631 | * multiple-function device. Use the USB_INTERFACE_INFO | |
632 | * macro, or its siblings, to match class-per-interface style | |
93c8bf45 AS |
633 | * devices (as recorded in bInterfaceClass). |
634 | * | |
635 | * Note that an entry created by USB_INTERFACE_INFO won't match | |
636 | * any interface if the device class is set to Vendor-Specific. | |
637 | * This is deliberate; according to the USB spec the meanings of | |
638 | * the interface class/subclass/protocol for these devices are also | |
639 | * vendor-specific, and hence matching against a standard product | |
640 | * class wouldn't work anyway. If you really want to use an | |
641 | * interface-based match for such a device, create a match record | |
642 | * that also specifies the vendor ID. (Unforunately there isn't a | |
643 | * standard macro for creating records like this.) | |
ddae41be GKH |
644 | * |
645 | * Within those groups, remember that not all combinations are | |
646 | * meaningful. For example, don't give a product version range | |
647 | * without vendor and product IDs; or specify a protocol without | |
648 | * its associated class and subclass. | |
649 | */ | |
650 | const struct usb_device_id *usb_match_id(struct usb_interface *interface, | |
651 | const struct usb_device_id *id) | |
652 | { | |
ddae41be GKH |
653 | /* proc_connectinfo in devio.c may call us with id == NULL. */ |
654 | if (id == NULL) | |
655 | return NULL; | |
656 | ||
ddae41be GKH |
657 | /* It is important to check that id->driver_info is nonzero, |
658 | since an entry that is all zeroes except for a nonzero | |
659 | id->driver_info is the way to create an entry that | |
660 | indicates that the driver want to examine every | |
661 | device and interface. */ | |
de6f92b9 GKH |
662 | for (; id->idVendor || id->idProduct || id->bDeviceClass || |
663 | id->bInterfaceClass || id->driver_info; id++) { | |
733260ff GKH |
664 | if (usb_match_one_id(interface, id)) |
665 | return id; | |
ddae41be GKH |
666 | } |
667 | ||
668 | return NULL; | |
669 | } | |
782e70c6 | 670 | EXPORT_SYMBOL_GPL(usb_match_id); |
ddae41be | 671 | |
8bb22d2b | 672 | static int usb_device_match(struct device *dev, struct device_driver *drv) |
ddae41be | 673 | { |
8bb54ab5 AS |
674 | /* devices and interfaces are handled separately */ |
675 | if (is_usb_device(dev)) { | |
ddae41be | 676 | |
8bb54ab5 AS |
677 | /* interface drivers never match devices */ |
678 | if (!is_usb_device_driver(drv)) | |
679 | return 0; | |
ddae41be | 680 | |
8bb54ab5 | 681 | /* TODO: Add real matching code */ |
ddae41be GKH |
682 | return 1; |
683 | ||
55129666 | 684 | } else if (is_usb_interface(dev)) { |
8bb54ab5 AS |
685 | struct usb_interface *intf; |
686 | struct usb_driver *usb_drv; | |
687 | const struct usb_device_id *id; | |
688 | ||
689 | /* device drivers never match interfaces */ | |
690 | if (is_usb_device_driver(drv)) | |
691 | return 0; | |
692 | ||
693 | intf = to_usb_interface(dev); | |
694 | usb_drv = to_usb_driver(drv); | |
695 | ||
696 | id = usb_match_id(intf, usb_drv->id_table); | |
697 | if (id) | |
698 | return 1; | |
699 | ||
700 | id = usb_match_dynamic_id(intf, usb_drv); | |
701 | if (id) | |
702 | return 1; | |
703 | } | |
704 | ||
ddae41be GKH |
705 | return 0; |
706 | } | |
707 | ||
36e56a34 | 708 | #ifdef CONFIG_HOTPLUG |
7eff2e7a | 709 | static int usb_uevent(struct device *dev, struct kobj_uevent_env *env) |
36e56a34 | 710 | { |
36e56a34 | 711 | struct usb_device *usb_dev; |
36e56a34 | 712 | |
55129666 | 713 | if (is_usb_device(dev)) { |
782da727 | 714 | usb_dev = to_usb_device(dev); |
55129666 | 715 | } else if (is_usb_interface(dev)) { |
9f8b17e6 | 716 | struct usb_interface *intf = to_usb_interface(dev); |
55129666 | 717 | |
8bb54ab5 | 718 | usb_dev = interface_to_usbdev(intf); |
55129666 KS |
719 | } else { |
720 | return 0; | |
8bb54ab5 | 721 | } |
36e56a34 AS |
722 | |
723 | if (usb_dev->devnum < 0) { | |
cceffe93 | 724 | /* driver is often null here; dev_dbg() would oops */ |
7071a3ce | 725 | pr_debug("usb %s: already deleted?\n", dev_name(dev)); |
36e56a34 AS |
726 | return -ENODEV; |
727 | } | |
728 | if (!usb_dev->bus) { | |
7071a3ce | 729 | pr_debug("usb %s: bus removed?\n", dev_name(dev)); |
36e56a34 AS |
730 | return -ENODEV; |
731 | } | |
732 | ||
733 | #ifdef CONFIG_USB_DEVICEFS | |
734 | /* If this is available, userspace programs can directly read | |
735 | * all the device descriptors we don't tell them about. Or | |
9f8b17e6 | 736 | * act as usermode drivers. |
36e56a34 | 737 | */ |
7eff2e7a | 738 | if (add_uevent_var(env, "DEVICE=/proc/bus/usb/%03d/%03d", |
36e56a34 AS |
739 | usb_dev->bus->busnum, usb_dev->devnum)) |
740 | return -ENOMEM; | |
741 | #endif | |
742 | ||
743 | /* per-device configurations are common */ | |
7eff2e7a | 744 | if (add_uevent_var(env, "PRODUCT=%x/%x/%x", |
36e56a34 AS |
745 | le16_to_cpu(usb_dev->descriptor.idVendor), |
746 | le16_to_cpu(usb_dev->descriptor.idProduct), | |
747 | le16_to_cpu(usb_dev->descriptor.bcdDevice))) | |
748 | return -ENOMEM; | |
749 | ||
750 | /* class-based driver binding models */ | |
7eff2e7a | 751 | if (add_uevent_var(env, "TYPE=%d/%d/%d", |
36e56a34 AS |
752 | usb_dev->descriptor.bDeviceClass, |
753 | usb_dev->descriptor.bDeviceSubClass, | |
754 | usb_dev->descriptor.bDeviceProtocol)) | |
755 | return -ENOMEM; | |
756 | ||
36e56a34 AS |
757 | return 0; |
758 | } | |
759 | ||
760 | #else | |
761 | ||
7eff2e7a | 762 | static int usb_uevent(struct device *dev, struct kobj_uevent_env *env) |
36e56a34 AS |
763 | { |
764 | return -ENODEV; | |
765 | } | |
36e56a34 AS |
766 | #endif /* CONFIG_HOTPLUG */ |
767 | ||
ddae41be | 768 | /** |
8bb54ab5 AS |
769 | * usb_register_device_driver - register a USB device (not interface) driver |
770 | * @new_udriver: USB operations for the device driver | |
2143acc6 | 771 | * @owner: module owner of this driver. |
ddae41be | 772 | * |
8bb54ab5 AS |
773 | * Registers a USB device driver with the USB core. The list of |
774 | * unattached devices will be rescanned whenever a new driver is | |
775 | * added, allowing the new driver to attach to any recognized devices. | |
776 | * Returns a negative error code on failure and 0 on success. | |
777 | */ | |
778 | int usb_register_device_driver(struct usb_device_driver *new_udriver, | |
779 | struct module *owner) | |
780 | { | |
781 | int retval = 0; | |
782 | ||
783 | if (usb_disabled()) | |
784 | return -ENODEV; | |
785 | ||
786 | new_udriver->drvwrap.for_devices = 1; | |
787 | new_udriver->drvwrap.driver.name = (char *) new_udriver->name; | |
788 | new_udriver->drvwrap.driver.bus = &usb_bus_type; | |
789 | new_udriver->drvwrap.driver.probe = usb_probe_device; | |
790 | new_udriver->drvwrap.driver.remove = usb_unbind_device; | |
791 | new_udriver->drvwrap.driver.owner = owner; | |
792 | ||
793 | retval = driver_register(&new_udriver->drvwrap.driver); | |
794 | ||
795 | if (!retval) { | |
796 | pr_info("%s: registered new device driver %s\n", | |
797 | usbcore_name, new_udriver->name); | |
798 | usbfs_update_special(); | |
799 | } else { | |
800 | printk(KERN_ERR "%s: error %d registering device " | |
801 | " driver %s\n", | |
802 | usbcore_name, retval, new_udriver->name); | |
803 | } | |
804 | ||
805 | return retval; | |
806 | } | |
807 | EXPORT_SYMBOL_GPL(usb_register_device_driver); | |
808 | ||
809 | /** | |
810 | * usb_deregister_device_driver - unregister a USB device (not interface) driver | |
811 | * @udriver: USB operations of the device driver to unregister | |
812 | * Context: must be able to sleep | |
813 | * | |
814 | * Unlinks the specified driver from the internal USB driver list. | |
815 | */ | |
816 | void usb_deregister_device_driver(struct usb_device_driver *udriver) | |
817 | { | |
818 | pr_info("%s: deregistering device driver %s\n", | |
819 | usbcore_name, udriver->name); | |
820 | ||
821 | driver_unregister(&udriver->drvwrap.driver); | |
822 | usbfs_update_special(); | |
823 | } | |
824 | EXPORT_SYMBOL_GPL(usb_deregister_device_driver); | |
825 | ||
826 | /** | |
827 | * usb_register_driver - register a USB interface driver | |
828 | * @new_driver: USB operations for the interface driver | |
829 | * @owner: module owner of this driver. | |
892705a1 | 830 | * @mod_name: module name string |
8bb54ab5 AS |
831 | * |
832 | * Registers a USB interface driver with the USB core. The list of | |
833 | * unattached interfaces will be rescanned whenever a new driver is | |
834 | * added, allowing the new driver to attach to any recognized interfaces. | |
ddae41be GKH |
835 | * Returns a negative error code on failure and 0 on success. |
836 | * | |
837 | * NOTE: if you want your driver to use the USB major number, you must call | |
838 | * usb_register_dev() to enable that functionality. This function no longer | |
839 | * takes care of that. | |
840 | */ | |
80f745fb GKH |
841 | int usb_register_driver(struct usb_driver *new_driver, struct module *owner, |
842 | const char *mod_name) | |
ddae41be GKH |
843 | { |
844 | int retval = 0; | |
845 | ||
846 | if (usb_disabled()) | |
847 | return -ENODEV; | |
848 | ||
8bb54ab5 AS |
849 | new_driver->drvwrap.for_devices = 0; |
850 | new_driver->drvwrap.driver.name = (char *) new_driver->name; | |
851 | new_driver->drvwrap.driver.bus = &usb_bus_type; | |
852 | new_driver->drvwrap.driver.probe = usb_probe_interface; | |
853 | new_driver->drvwrap.driver.remove = usb_unbind_interface; | |
854 | new_driver->drvwrap.driver.owner = owner; | |
80f745fb | 855 | new_driver->drvwrap.driver.mod_name = mod_name; |
733260ff GKH |
856 | spin_lock_init(&new_driver->dynids.lock); |
857 | INIT_LIST_HEAD(&new_driver->dynids.list); | |
ddae41be | 858 | |
8bb54ab5 | 859 | retval = driver_register(&new_driver->drvwrap.driver); |
0c7a2b72 CR |
860 | if (retval) |
861 | goto out; | |
ddae41be | 862 | |
0c7a2b72 CR |
863 | usbfs_update_special(); |
864 | ||
865 | retval = usb_create_newid_file(new_driver); | |
866 | if (retval) | |
867 | goto out_newid; | |
868 | ||
869 | retval = usb_create_removeid_file(new_driver); | |
870 | if (retval) | |
871 | goto out_removeid; | |
872 | ||
873 | pr_info("%s: registered new interface driver %s\n", | |
ddae41be | 874 | usbcore_name, new_driver->name); |
ddae41be | 875 | |
0c7a2b72 | 876 | out: |
ddae41be | 877 | return retval; |
0c7a2b72 CR |
878 | |
879 | out_removeid: | |
880 | usb_remove_newid_file(new_driver); | |
881 | out_newid: | |
882 | driver_unregister(&new_driver->drvwrap.driver); | |
883 | ||
884 | printk(KERN_ERR "%s: error %d registering interface " | |
885 | " driver %s\n", | |
886 | usbcore_name, retval, new_driver->name); | |
887 | goto out; | |
ddae41be | 888 | } |
782e70c6 | 889 | EXPORT_SYMBOL_GPL(usb_register_driver); |
ddae41be GKH |
890 | |
891 | /** | |
8bb54ab5 AS |
892 | * usb_deregister - unregister a USB interface driver |
893 | * @driver: USB operations of the interface driver to unregister | |
ddae41be GKH |
894 | * Context: must be able to sleep |
895 | * | |
896 | * Unlinks the specified driver from the internal USB driver list. | |
897 | * | |
898 | * NOTE: If you called usb_register_dev(), you still need to call | |
899 | * usb_deregister_dev() to clean up your driver's allocated minor numbers, | |
900 | * this * call will no longer do it for you. | |
901 | */ | |
902 | void usb_deregister(struct usb_driver *driver) | |
903 | { | |
8bb54ab5 AS |
904 | pr_info("%s: deregistering interface driver %s\n", |
905 | usbcore_name, driver->name); | |
ddae41be | 906 | |
0c7a2b72 | 907 | usb_remove_removeid_file(driver); |
ba9dc657 | 908 | usb_remove_newid_file(driver); |
733260ff | 909 | usb_free_dynids(driver); |
8bb54ab5 | 910 | driver_unregister(&driver->drvwrap.driver); |
ddae41be GKH |
911 | |
912 | usbfs_update_special(); | |
913 | } | |
782e70c6 | 914 | EXPORT_SYMBOL_GPL(usb_deregister); |
36e56a34 | 915 | |
78d9a487 AS |
916 | /* Forced unbinding of a USB interface driver, either because |
917 | * it doesn't support pre_reset/post_reset/reset_resume or | |
918 | * because it doesn't support suspend/resume. | |
919 | * | |
920 | * The caller must hold @intf's device's lock, but not its pm_mutex | |
921 | * and not @intf->dev.sem. | |
922 | */ | |
923 | void usb_forced_unbind_intf(struct usb_interface *intf) | |
924 | { | |
925 | struct usb_driver *driver = to_usb_driver(intf->dev.driver); | |
926 | ||
927 | dev_dbg(&intf->dev, "forced unbind\n"); | |
928 | usb_driver_release_interface(driver, intf); | |
929 | ||
930 | /* Mark the interface for later rebinding */ | |
931 | intf->needs_binding = 1; | |
932 | } | |
933 | ||
934 | /* Delayed forced unbinding of a USB interface driver and scan | |
935 | * for rebinding. | |
936 | * | |
937 | * The caller must hold @intf's device's lock, but not its pm_mutex | |
938 | * and not @intf->dev.sem. | |
939 | * | |
5096aedc AS |
940 | * Note: Rebinds will be skipped if a system sleep transition is in |
941 | * progress and the PM "complete" callback hasn't occurred yet. | |
78d9a487 AS |
942 | */ |
943 | void usb_rebind_intf(struct usb_interface *intf) | |
944 | { | |
945 | int rc; | |
946 | ||
947 | /* Delayed unbind of an existing driver */ | |
948 | if (intf->dev.driver) { | |
949 | struct usb_driver *driver = | |
950 | to_usb_driver(intf->dev.driver); | |
951 | ||
952 | dev_dbg(&intf->dev, "forced unbind\n"); | |
953 | usb_driver_release_interface(driver, intf); | |
954 | } | |
955 | ||
956 | /* Try to rebind the interface */ | |
5096aedc AS |
957 | if (intf->dev.power.status == DPM_ON) { |
958 | intf->needs_binding = 0; | |
959 | rc = device_attach(&intf->dev); | |
960 | if (rc < 0) | |
961 | dev_warn(&intf->dev, "rebind failed: %d\n", rc); | |
962 | } | |
78d9a487 AS |
963 | } |
964 | ||
9ff78433 AS |
965 | #ifdef CONFIG_PM |
966 | ||
78d9a487 AS |
967 | #define DO_UNBIND 0 |
968 | #define DO_REBIND 1 | |
969 | ||
970 | /* Unbind drivers for @udev's interfaces that don't support suspend/resume, | |
971 | * or rebind interfaces that have been unbound, according to @action. | |
972 | * | |
973 | * The caller must hold @udev's device lock. | |
78d9a487 AS |
974 | */ |
975 | static void do_unbind_rebind(struct usb_device *udev, int action) | |
976 | { | |
977 | struct usb_host_config *config; | |
978 | int i; | |
979 | struct usb_interface *intf; | |
980 | struct usb_driver *drv; | |
981 | ||
982 | config = udev->actconfig; | |
983 | if (config) { | |
984 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { | |
985 | intf = config->interface[i]; | |
986 | switch (action) { | |
987 | case DO_UNBIND: | |
988 | if (intf->dev.driver) { | |
989 | drv = to_usb_driver(intf->dev.driver); | |
990 | if (!drv->suspend || !drv->resume) | |
991 | usb_forced_unbind_intf(intf); | |
992 | } | |
993 | break; | |
994 | case DO_REBIND: | |
5096aedc | 995 | if (intf->needs_binding) |
78d9a487 | 996 | usb_rebind_intf(intf); |
78d9a487 AS |
997 | break; |
998 | } | |
999 | } | |
1000 | } | |
1001 | } | |
1002 | ||
d5ec1686 | 1003 | static int usb_suspend_device(struct usb_device *udev, pm_message_t msg) |
36e56a34 | 1004 | { |
782da727 | 1005 | struct usb_device_driver *udriver; |
2bf4086d | 1006 | int status = 0; |
36e56a34 | 1007 | |
114b368c AS |
1008 | if (udev->state == USB_STATE_NOTATTACHED || |
1009 | udev->state == USB_STATE_SUSPENDED) | |
1010 | goto done; | |
1011 | ||
b6f6436d AS |
1012 | /* For devices that don't have a driver, we do a generic suspend. */ |
1013 | if (udev->dev.driver) | |
1014 | udriver = to_usb_device_driver(udev->dev.driver); | |
1015 | else { | |
645daaab | 1016 | udev->do_remote_wakeup = 0; |
b6f6436d | 1017 | udriver = &usb_generic_driver; |
1c5df7e7 | 1018 | } |
2bf4086d AS |
1019 | status = udriver->suspend(udev, msg); |
1020 | ||
20dfdad7 | 1021 | done: |
441b62c1 | 1022 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
2bf4086d | 1023 | return status; |
1cc8a25d AS |
1024 | } |
1025 | ||
65bfd296 | 1026 | static int usb_resume_device(struct usb_device *udev, pm_message_t msg) |
1cc8a25d AS |
1027 | { |
1028 | struct usb_device_driver *udriver; | |
2bf4086d | 1029 | int status = 0; |
36e56a34 | 1030 | |
0458d5b4 AS |
1031 | if (udev->state == USB_STATE_NOTATTACHED) |
1032 | goto done; | |
1cc8a25d | 1033 | |
1c5df7e7 AS |
1034 | /* Can't resume it if it doesn't have a driver. */ |
1035 | if (udev->dev.driver == NULL) { | |
1036 | status = -ENOTCONN; | |
2bf4086d | 1037 | goto done; |
1c5df7e7 AS |
1038 | } |
1039 | ||
6d19c009 AS |
1040 | /* Non-root devices on a full/low-speed bus must wait for their |
1041 | * companion high-speed root hub, in case a handoff is needed. | |
1042 | */ | |
1043 | if (!(msg.event & PM_EVENT_AUTO) && udev->parent && | |
1044 | udev->bus->hs_companion) | |
1045 | device_pm_wait_for_dev(&udev->dev, | |
1046 | &udev->bus->hs_companion->root_hub->dev); | |
1047 | ||
6bc6cff5 AS |
1048 | if (udev->quirks & USB_QUIRK_RESET_RESUME) |
1049 | udev->reset_resume = 1; | |
1050 | ||
1cc8a25d | 1051 | udriver = to_usb_device_driver(udev->dev.driver); |
65bfd296 | 1052 | status = udriver->resume(udev, msg); |
2bf4086d | 1053 | |
20dfdad7 | 1054 | done: |
441b62c1 | 1055 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
2bf4086d | 1056 | return status; |
1cc8a25d AS |
1057 | } |
1058 | ||
65605ae8 AS |
1059 | static int usb_suspend_interface(struct usb_device *udev, |
1060 | struct usb_interface *intf, pm_message_t msg) | |
1cc8a25d AS |
1061 | { |
1062 | struct usb_driver *driver; | |
2bf4086d | 1063 | int status = 0; |
1cc8a25d | 1064 | |
9bbdf1e0 AS |
1065 | if (udev->state == USB_STATE_NOTATTACHED || |
1066 | intf->condition == USB_INTERFACE_UNBOUND) | |
2bf4086d | 1067 | goto done; |
114b368c | 1068 | driver = to_usb_driver(intf->dev.driver); |
36e56a34 | 1069 | |
78d9a487 | 1070 | if (driver->suspend) { |
1cc8a25d | 1071 | status = driver->suspend(intf, msg); |
9bbdf1e0 | 1072 | if (status && !(msg.event & PM_EVENT_AUTO)) |
1cc8a25d AS |
1073 | dev_err(&intf->dev, "%s error %d\n", |
1074 | "suspend", status); | |
36e56a34 | 1075 | } else { |
78d9a487 AS |
1076 | /* Later we will unbind the driver and reprobe */ |
1077 | intf->needs_binding = 1; | |
1078 | dev_warn(&intf->dev, "no %s for driver %s?\n", | |
1079 | "suspend", driver->name); | |
36e56a34 | 1080 | } |
2bf4086d | 1081 | |
20dfdad7 | 1082 | done: |
441b62c1 | 1083 | dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status); |
36e56a34 AS |
1084 | return status; |
1085 | } | |
1086 | ||
65605ae8 | 1087 | static int usb_resume_interface(struct usb_device *udev, |
65bfd296 | 1088 | struct usb_interface *intf, pm_message_t msg, int reset_resume) |
36e56a34 | 1089 | { |
1cc8a25d | 1090 | struct usb_driver *driver; |
2bf4086d | 1091 | int status = 0; |
36e56a34 | 1092 | |
9bbdf1e0 | 1093 | if (udev->state == USB_STATE_NOTATTACHED) |
2bf4086d | 1094 | goto done; |
36e56a34 | 1095 | |
645daaab AS |
1096 | /* Don't let autoresume interfere with unbinding */ |
1097 | if (intf->condition == USB_INTERFACE_UNBINDING) | |
1098 | goto done; | |
1099 | ||
1c5df7e7 | 1100 | /* Can't resume it if it doesn't have a driver. */ |
55151d7d AS |
1101 | if (intf->condition == USB_INTERFACE_UNBOUND) { |
1102 | ||
1103 | /* Carry out a deferred switch to altsetting 0 */ | |
1104 | if (intf->needs_altsetting0 && | |
1105 | intf->dev.power.status == DPM_ON) { | |
1106 | usb_set_interface(udev, intf->altsetting[0]. | |
1107 | desc.bInterfaceNumber, 0); | |
1108 | intf->needs_altsetting0 = 0; | |
1109 | } | |
78d9a487 | 1110 | goto done; |
55151d7d | 1111 | } |
78d9a487 AS |
1112 | |
1113 | /* Don't resume if the interface is marked for rebinding */ | |
1114 | if (intf->needs_binding) | |
2bf4086d | 1115 | goto done; |
1cc8a25d | 1116 | driver = to_usb_driver(intf->dev.driver); |
36e56a34 | 1117 | |
f07600cf AS |
1118 | if (reset_resume) { |
1119 | if (driver->reset_resume) { | |
1120 | status = driver->reset_resume(intf); | |
1121 | if (status) | |
1122 | dev_err(&intf->dev, "%s error %d\n", | |
1123 | "reset_resume", status); | |
1124 | } else { | |
78d9a487 | 1125 | intf->needs_binding = 1; |
f07600cf AS |
1126 | dev_warn(&intf->dev, "no %s for driver %s?\n", |
1127 | "reset_resume", driver->name); | |
1128 | } | |
1129 | } else { | |
1130 | if (driver->resume) { | |
1131 | status = driver->resume(intf); | |
1132 | if (status) | |
1133 | dev_err(&intf->dev, "%s error %d\n", | |
1134 | "resume", status); | |
1135 | } else { | |
78d9a487 | 1136 | intf->needs_binding = 1; |
f07600cf AS |
1137 | dev_warn(&intf->dev, "no %s for driver %s?\n", |
1138 | "resume", driver->name); | |
1139 | } | |
1140 | } | |
2bf4086d AS |
1141 | |
1142 | done: | |
441b62c1 | 1143 | dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status); |
f07600cf | 1144 | |
78d9a487 | 1145 | /* Later we will unbind the driver and/or reprobe, if necessary */ |
2bf4086d | 1146 | return status; |
36e56a34 AS |
1147 | } |
1148 | ||
645daaab AS |
1149 | /** |
1150 | * usb_suspend_both - suspend a USB device and its interfaces | |
1151 | * @udev: the usb_device to suspend | |
1152 | * @msg: Power Management message describing this state transition | |
1153 | * | |
1154 | * This is the central routine for suspending USB devices. It calls the | |
1155 | * suspend methods for all the interface drivers in @udev and then calls | |
1156 | * the suspend method for @udev itself. If an error occurs at any stage, | |
1157 | * all the interfaces which were suspended are resumed so that they remain | |
1158 | * in the same state as the device. | |
1159 | * | |
9bbdf1e0 AS |
1160 | * Autosuspend requests originating from a child device or an interface |
1161 | * driver may be made without the protection of @udev's device lock, but | |
1162 | * all other suspend calls will hold the lock. Usbcore will insure that | |
1163 | * method calls do not arrive during bind, unbind, or reset operations. | |
1164 | * However drivers must be prepared to handle suspend calls arriving at | |
1165 | * unpredictable times. | |
645daaab AS |
1166 | * |
1167 | * This routine can run only in process context. | |
1168 | */ | |
718efa64 | 1169 | static int usb_suspend_both(struct usb_device *udev, pm_message_t msg) |
a8e7c565 AS |
1170 | { |
1171 | int status = 0; | |
1172 | int i = 0; | |
1173 | struct usb_interface *intf; | |
645daaab | 1174 | |
1941044a AS |
1175 | if (udev->state == USB_STATE_NOTATTACHED || |
1176 | udev->state == USB_STATE_SUSPENDED) | |
1177 | goto done; | |
a8e7c565 | 1178 | |
645daaab | 1179 | /* Suspend all the interfaces and then udev itself */ |
a8e7c565 AS |
1180 | if (udev->actconfig) { |
1181 | for (; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
1182 | intf = udev->actconfig->interface[i]; | |
65605ae8 | 1183 | status = usb_suspend_interface(udev, intf, msg); |
a8e7c565 AS |
1184 | if (status != 0) |
1185 | break; | |
1186 | } | |
1187 | } | |
5ad4f71e | 1188 | if (status == 0) |
d5ec1686 | 1189 | status = usb_suspend_device(udev, msg); |
a8e7c565 AS |
1190 | |
1191 | /* If the suspend failed, resume interfaces that did get suspended */ | |
1192 | if (status != 0) { | |
9bbdf1e0 | 1193 | msg.event ^= (PM_EVENT_SUSPEND | PM_EVENT_RESUME); |
a8e7c565 AS |
1194 | while (--i >= 0) { |
1195 | intf = udev->actconfig->interface[i]; | |
9bbdf1e0 | 1196 | usb_resume_interface(udev, intf, msg, 0); |
a8e7c565 | 1197 | } |
645daaab | 1198 | |
9bbdf1e0 AS |
1199 | /* If the suspend succeeded then prevent any more URB submissions |
1200 | * and flush any outstanding URBs. | |
6840d255 | 1201 | */ |
ef7f6c70 | 1202 | } else { |
6840d255 AS |
1203 | udev->can_submit = 0; |
1204 | for (i = 0; i < 16; ++i) { | |
1205 | usb_hcd_flush_endpoint(udev, udev->ep_out[i]); | |
1206 | usb_hcd_flush_endpoint(udev, udev->ep_in[i]); | |
1207 | } | |
ef7f6c70 | 1208 | } |
645daaab | 1209 | |
1941044a | 1210 | done: |
441b62c1 | 1211 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
a8e7c565 AS |
1212 | return status; |
1213 | } | |
1214 | ||
645daaab AS |
1215 | /** |
1216 | * usb_resume_both - resume a USB device and its interfaces | |
1217 | * @udev: the usb_device to resume | |
65bfd296 | 1218 | * @msg: Power Management message describing this state transition |
645daaab AS |
1219 | * |
1220 | * This is the central routine for resuming USB devices. It calls the | |
1221 | * the resume method for @udev and then calls the resume methods for all | |
1222 | * the interface drivers in @udev. | |
1223 | * | |
9bbdf1e0 AS |
1224 | * Autoresume requests originating from a child device or an interface |
1225 | * driver may be made without the protection of @udev's device lock, but | |
1226 | * all other resume calls will hold the lock. Usbcore will insure that | |
1227 | * method calls do not arrive during bind, unbind, or reset operations. | |
1228 | * However drivers must be prepared to handle resume calls arriving at | |
1229 | * unpredictable times. | |
645daaab AS |
1230 | * |
1231 | * This routine can run only in process context. | |
1232 | */ | |
65bfd296 | 1233 | static int usb_resume_both(struct usb_device *udev, pm_message_t msg) |
a8e7c565 | 1234 | { |
645daaab | 1235 | int status = 0; |
a8e7c565 AS |
1236 | int i; |
1237 | struct usb_interface *intf; | |
645daaab | 1238 | |
1941044a AS |
1239 | if (udev->state == USB_STATE_NOTATTACHED) { |
1240 | status = -ENODEV; | |
1241 | goto done; | |
1242 | } | |
6840d255 | 1243 | udev->can_submit = 1; |
a8e7c565 | 1244 | |
9bbdf1e0 AS |
1245 | /* Resume the device */ |
1246 | if (udev->state == USB_STATE_SUSPENDED || udev->reset_resume) | |
65bfd296 | 1247 | status = usb_resume_device(udev, msg); |
114b368c | 1248 | |
9bbdf1e0 | 1249 | /* Resume the interfaces */ |
a8e7c565 AS |
1250 | if (status == 0 && udev->actconfig) { |
1251 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
1252 | intf = udev->actconfig->interface[i]; | |
65bfd296 AS |
1253 | usb_resume_interface(udev, intf, msg, |
1254 | udev->reset_resume); | |
a8e7c565 AS |
1255 | } |
1256 | } | |
645daaab | 1257 | |
1941044a | 1258 | done: |
441b62c1 | 1259 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
70a1c9e0 AS |
1260 | if (!status) |
1261 | udev->reset_resume = 0; | |
645daaab AS |
1262 | return status; |
1263 | } | |
1264 | ||
9bbdf1e0 | 1265 | /* The device lock is held by the PM core */ |
0c590e23 AS |
1266 | int usb_suspend(struct device *dev, pm_message_t msg) |
1267 | { | |
9bbdf1e0 | 1268 | struct usb_device *udev = to_usb_device(dev); |
0c590e23 | 1269 | |
9bbdf1e0 AS |
1270 | do_unbind_rebind(udev, DO_UNBIND); |
1271 | udev->do_remote_wakeup = device_may_wakeup(&udev->dev); | |
1272 | return usb_suspend_both(udev, msg); | |
0c590e23 AS |
1273 | } |
1274 | ||
9bbdf1e0 | 1275 | /* The device lock is held by the PM core */ |
0c590e23 AS |
1276 | int usb_resume(struct device *dev, pm_message_t msg) |
1277 | { | |
9bbdf1e0 | 1278 | struct usb_device *udev = to_usb_device(dev); |
0c590e23 AS |
1279 | int status; |
1280 | ||
9bbdf1e0 AS |
1281 | /* For PM complete calls, all we do is rebind interfaces */ |
1282 | if (msg.event == PM_EVENT_ON) { | |
1283 | if (udev->state != USB_STATE_NOTATTACHED) | |
1284 | do_unbind_rebind(udev, DO_REBIND); | |
1285 | status = 0; | |
0c590e23 | 1286 | |
9bbdf1e0 AS |
1287 | /* For all other calls, take the device back to full power and |
1288 | * tell the PM core in case it was autosuspended previously. | |
0c590e23 | 1289 | */ |
9bbdf1e0 AS |
1290 | } else { |
1291 | status = usb_resume_both(udev, msg); | |
1292 | if (status == 0) { | |
1293 | pm_runtime_disable(dev); | |
1294 | pm_runtime_set_active(dev); | |
1295 | pm_runtime_enable(dev); | |
1296 | udev->last_busy = jiffies; | |
1297 | } | |
1298 | } | |
0c590e23 AS |
1299 | |
1300 | /* Avoid PM error messages for devices disconnected while suspended | |
1301 | * as we'll display regular disconnect messages just a bit later. | |
1302 | */ | |
1303 | if (status == -ENODEV) | |
9bbdf1e0 | 1304 | status = 0; |
0c590e23 AS |
1305 | return status; |
1306 | } | |
1307 | ||
1308 | #endif /* CONFIG_PM */ | |
1309 | ||
645daaab AS |
1310 | #ifdef CONFIG_USB_SUSPEND |
1311 | ||
088f7fec AS |
1312 | /** |
1313 | * usb_enable_autosuspend - allow a USB device to be autosuspended | |
1314 | * @udev: the USB device which may be autosuspended | |
1315 | * | |
1316 | * This routine allows @udev to be autosuspended. An autosuspend won't | |
1317 | * take place until the autosuspend_delay has elapsed and all the other | |
1318 | * necessary conditions are satisfied. | |
1319 | * | |
1320 | * The caller must hold @udev's device lock. | |
1321 | */ | |
1322 | int usb_enable_autosuspend(struct usb_device *udev) | |
1323 | { | |
1324 | if (udev->autosuspend_disabled) { | |
1325 | udev->autosuspend_disabled = 0; | |
1326 | usb_autosuspend_device(udev); | |
1327 | } | |
1328 | return 0; | |
1329 | } | |
1330 | EXPORT_SYMBOL_GPL(usb_enable_autosuspend); | |
1331 | ||
1332 | /** | |
1333 | * usb_disable_autosuspend - prevent a USB device from being autosuspended | |
1334 | * @udev: the USB device which may not be autosuspended | |
1335 | * | |
1336 | * This routine prevents @udev from being autosuspended and wakes it up | |
1337 | * if it is already autosuspended. | |
1338 | * | |
1339 | * The caller must hold @udev's device lock. | |
1340 | */ | |
1341 | int usb_disable_autosuspend(struct usb_device *udev) | |
1342 | { | |
1343 | int rc = 0; | |
1344 | ||
1345 | if (!udev->autosuspend_disabled) { | |
1346 | rc = usb_autoresume_device(udev); | |
1347 | if (rc == 0) | |
1348 | udev->autosuspend_disabled = 1; | |
1349 | } | |
1350 | return rc; | |
1351 | } | |
1352 | EXPORT_SYMBOL_GPL(usb_disable_autosuspend); | |
1353 | ||
645daaab AS |
1354 | /** |
1355 | * usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces | |
701f35af | 1356 | * @udev: the usb_device to autosuspend |
645daaab AS |
1357 | * |
1358 | * This routine should be called when a core subsystem is finished using | |
1359 | * @udev and wants to allow it to autosuspend. Examples would be when | |
1360 | * @udev's device file in usbfs is closed or after a configuration change. | |
1361 | * | |
9bbdf1e0 AS |
1362 | * @udev's usage counter is decremented; if it drops to 0 and all the |
1363 | * interfaces are inactive then a delayed autosuspend will be attempted. | |
1364 | * The attempt may fail (see autosuspend_check()). | |
645daaab | 1365 | * |
62e299e6 | 1366 | * The caller must hold @udev's device lock. |
645daaab AS |
1367 | * |
1368 | * This routine can run only in process context. | |
1369 | */ | |
94fcda1f | 1370 | void usb_autosuspend_device(struct usb_device *udev) |
645daaab | 1371 | { |
94fcda1f AS |
1372 | int status; |
1373 | ||
9bbdf1e0 AS |
1374 | udev->last_busy = jiffies; |
1375 | status = pm_runtime_put_sync(&udev->dev); | |
1376 | dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n", | |
1377 | __func__, atomic_read(&udev->dev.power.usage_count), | |
1378 | status); | |
19c26239 AS |
1379 | } |
1380 | ||
1381 | /** | |
1382 | * usb_try_autosuspend_device - attempt an autosuspend of a USB device and its interfaces | |
1383 | * @udev: the usb_device to autosuspend | |
1384 | * | |
1385 | * This routine should be called when a core subsystem thinks @udev may | |
1386 | * be ready to autosuspend. | |
1387 | * | |
9bbdf1e0 AS |
1388 | * @udev's usage counter left unchanged. If it is 0 and all the interfaces |
1389 | * are inactive then an autosuspend will be attempted. The attempt may | |
1390 | * fail or be delayed. | |
19c26239 | 1391 | * |
62e299e6 AS |
1392 | * The caller must hold @udev's device lock. |
1393 | * | |
19c26239 AS |
1394 | * This routine can run only in process context. |
1395 | */ | |
1396 | void usb_try_autosuspend_device(struct usb_device *udev) | |
1397 | { | |
9bbdf1e0 AS |
1398 | int status; |
1399 | ||
1400 | status = pm_runtime_idle(&udev->dev); | |
1401 | dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n", | |
1402 | __func__, atomic_read(&udev->dev.power.usage_count), | |
1403 | status); | |
645daaab AS |
1404 | } |
1405 | ||
1406 | /** | |
1407 | * usb_autoresume_device - immediately autoresume a USB device and its interfaces | |
701f35af | 1408 | * @udev: the usb_device to autoresume |
645daaab AS |
1409 | * |
1410 | * This routine should be called when a core subsystem wants to use @udev | |
94fcda1f | 1411 | * and needs to guarantee that it is not suspended. No autosuspend will |
9bbdf1e0 AS |
1412 | * occur until usb_autosuspend_device() is called. (Note that this will |
1413 | * not prevent suspend events originating in the PM core.) Examples would | |
1414 | * be when @udev's device file in usbfs is opened or when a remote-wakeup | |
94fcda1f | 1415 | * request is received. |
645daaab | 1416 | * |
94fcda1f AS |
1417 | * @udev's usage counter is incremented to prevent subsequent autosuspends. |
1418 | * However if the autoresume fails then the usage counter is re-decremented. | |
645daaab | 1419 | * |
62e299e6 | 1420 | * The caller must hold @udev's device lock. |
645daaab AS |
1421 | * |
1422 | * This routine can run only in process context. | |
1423 | */ | |
94fcda1f | 1424 | int usb_autoresume_device(struct usb_device *udev) |
645daaab AS |
1425 | { |
1426 | int status; | |
1427 | ||
9bbdf1e0 AS |
1428 | status = pm_runtime_get_sync(&udev->dev); |
1429 | if (status < 0) | |
1430 | pm_runtime_put_sync(&udev->dev); | |
1431 | dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n", | |
1432 | __func__, atomic_read(&udev->dev.power.usage_count), | |
1433 | status); | |
1434 | if (status > 0) | |
1435 | status = 0; | |
af4f7606 AS |
1436 | return status; |
1437 | } | |
1438 | ||
645daaab AS |
1439 | /** |
1440 | * usb_autopm_put_interface - decrement a USB interface's PM-usage counter | |
701f35af | 1441 | * @intf: the usb_interface whose counter should be decremented |
645daaab AS |
1442 | * |
1443 | * This routine should be called by an interface driver when it is | |
1444 | * finished using @intf and wants to allow it to autosuspend. A typical | |
1445 | * example would be a character-device driver when its device file is | |
1446 | * closed. | |
1447 | * | |
1448 | * The routine decrements @intf's usage counter. When the counter reaches | |
9bbdf1e0 AS |
1449 | * 0, a delayed autosuspend request for @intf's device is attempted. The |
1450 | * attempt may fail (see autosuspend_check()). | |
645daaab AS |
1451 | * |
1452 | * If the driver has set @intf->needs_remote_wakeup then autosuspend will | |
1453 | * take place only if the device's remote-wakeup facility is enabled. | |
1454 | * | |
645daaab AS |
1455 | * This routine can run only in process context. |
1456 | */ | |
1457 | void usb_autopm_put_interface(struct usb_interface *intf) | |
1458 | { | |
9bbdf1e0 AS |
1459 | struct usb_device *udev = interface_to_usbdev(intf); |
1460 | int status; | |
645daaab | 1461 | |
9bbdf1e0 AS |
1462 | udev->last_busy = jiffies; |
1463 | atomic_dec(&intf->pm_usage_cnt); | |
1464 | status = pm_runtime_put_sync(&intf->dev); | |
1465 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", | |
1466 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1467 | status); | |
645daaab AS |
1468 | } |
1469 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface); | |
1470 | ||
9ac39f28 AS |
1471 | /** |
1472 | * usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter | |
1473 | * @intf: the usb_interface whose counter should be decremented | |
1474 | * | |
9bbdf1e0 AS |
1475 | * This routine does much the same thing as usb_autopm_put_interface(): |
1476 | * It decrements @intf's usage counter and schedules a delayed | |
1477 | * autosuspend request if the counter is <= 0. The difference is that it | |
1478 | * does not perform any synchronization; callers should hold a private | |
1479 | * lock and handle all synchronization issues themselves. | |
9ac39f28 AS |
1480 | * |
1481 | * Typically a driver would call this routine during an URB's completion | |
1482 | * handler, if no more URBs were pending. | |
1483 | * | |
1484 | * This routine can run in atomic context. | |
1485 | */ | |
1486 | void usb_autopm_put_interface_async(struct usb_interface *intf) | |
1487 | { | |
1488 | struct usb_device *udev = interface_to_usbdev(intf); | |
9bbdf1e0 | 1489 | unsigned long last_busy; |
9ac39f28 AS |
1490 | int status = 0; |
1491 | ||
9bbdf1e0 AS |
1492 | last_busy = udev->last_busy; |
1493 | udev->last_busy = jiffies; | |
1494 | atomic_dec(&intf->pm_usage_cnt); | |
1495 | pm_runtime_put_noidle(&intf->dev); | |
1496 | ||
1497 | if (!udev->autosuspend_disabled) { | |
1498 | /* Optimization: Don't schedule a delayed autosuspend if | |
1499 | * the timer is already running and the expiration time | |
1500 | * wouldn't change. | |
1501 | * | |
1502 | * We have to use the interface's timer. Attempts to | |
1503 | * schedule a suspend for the device would fail because | |
1504 | * the interface is still active. | |
1505 | */ | |
1506 | if (intf->dev.power.timer_expires == 0 || | |
1507 | round_jiffies_up(last_busy) != | |
1508 | round_jiffies_up(jiffies)) { | |
1509 | status = pm_schedule_suspend(&intf->dev, | |
1510 | jiffies_to_msecs( | |
4ec06d62 | 1511 | round_jiffies_up_relative( |
9bbdf1e0 | 1512 | udev->autosuspend_delay))); |
9ac39f28 AS |
1513 | } |
1514 | } | |
9bbdf1e0 AS |
1515 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
1516 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1517 | status); | |
9ac39f28 AS |
1518 | } |
1519 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async); | |
1520 | ||
9bbdf1e0 AS |
1521 | /** |
1522 | * usb_autopm_put_interface_no_suspend - decrement a USB interface's PM-usage counter | |
1523 | * @intf: the usb_interface whose counter should be decremented | |
1524 | * | |
1525 | * This routine decrements @intf's usage counter but does not carry out an | |
1526 | * autosuspend. | |
1527 | * | |
1528 | * This routine can run in atomic context. | |
1529 | */ | |
1530 | void usb_autopm_put_interface_no_suspend(struct usb_interface *intf) | |
1531 | { | |
1532 | struct usb_device *udev = interface_to_usbdev(intf); | |
1533 | ||
1534 | udev->last_busy = jiffies; | |
1535 | atomic_dec(&intf->pm_usage_cnt); | |
1536 | pm_runtime_put_noidle(&intf->dev); | |
1537 | } | |
1538 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface_no_suspend); | |
1539 | ||
645daaab AS |
1540 | /** |
1541 | * usb_autopm_get_interface - increment a USB interface's PM-usage counter | |
701f35af | 1542 | * @intf: the usb_interface whose counter should be incremented |
645daaab AS |
1543 | * |
1544 | * This routine should be called by an interface driver when it wants to | |
1545 | * use @intf and needs to guarantee that it is not suspended. In addition, | |
1546 | * the routine prevents @intf from being autosuspended subsequently. (Note | |
1547 | * that this will not prevent suspend events originating in the PM core.) | |
1548 | * This prevention will persist until usb_autopm_put_interface() is called | |
1549 | * or @intf is unbound. A typical example would be a character-device | |
1550 | * driver when its device file is opened. | |
1551 | * | |
9bbdf1e0 AS |
1552 | * @intf's usage counter is incremented to prevent subsequent autosuspends. |
1553 | * However if the autoresume fails then the counter is re-decremented. | |
645daaab AS |
1554 | * |
1555 | * This routine can run only in process context. | |
1556 | */ | |
1557 | int usb_autopm_get_interface(struct usb_interface *intf) | |
1558 | { | |
af4f7606 | 1559 | int status; |
645daaab | 1560 | |
9bbdf1e0 AS |
1561 | status = pm_runtime_get_sync(&intf->dev); |
1562 | if (status < 0) | |
1563 | pm_runtime_put_sync(&intf->dev); | |
1564 | else | |
1565 | atomic_inc(&intf->pm_usage_cnt); | |
1566 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", | |
1567 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1568 | status); | |
1569 | if (status > 0) | |
1570 | status = 0; | |
a8e7c565 AS |
1571 | return status; |
1572 | } | |
645daaab AS |
1573 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface); |
1574 | ||
9ac39f28 AS |
1575 | /** |
1576 | * usb_autopm_get_interface_async - increment a USB interface's PM-usage counter | |
1577 | * @intf: the usb_interface whose counter should be incremented | |
1578 | * | |
1579 | * This routine does much the same thing as | |
9bbdf1e0 AS |
1580 | * usb_autopm_get_interface(): It increments @intf's usage counter and |
1581 | * queues an autoresume request if the device is suspended. The | |
1582 | * differences are that it does not perform any synchronization (callers | |
1583 | * should hold a private lock and handle all synchronization issues | |
1584 | * themselves), and it does not autoresume the device directly (it only | |
1585 | * queues a request). After a successful call, the device may not yet be | |
1586 | * resumed. | |
9ac39f28 AS |
1587 | * |
1588 | * This routine can run in atomic context. | |
1589 | */ | |
1590 | int usb_autopm_get_interface_async(struct usb_interface *intf) | |
1591 | { | |
9bbdf1e0 AS |
1592 | int status = 0; |
1593 | enum rpm_status s; | |
9ac39f28 | 1594 | |
9bbdf1e0 AS |
1595 | /* Don't request a resume unless the interface is already suspending |
1596 | * or suspended. Doing so would force a running suspend timer to be | |
1597 | * cancelled. | |
1598 | */ | |
1599 | pm_runtime_get_noresume(&intf->dev); | |
1600 | s = ACCESS_ONCE(intf->dev.power.runtime_status); | |
1601 | if (s == RPM_SUSPENDING || s == RPM_SUSPENDED) | |
1602 | status = pm_request_resume(&intf->dev); | |
1603 | ||
1604 | if (status < 0 && status != -EINPROGRESS) | |
1605 | pm_runtime_put_noidle(&intf->dev); | |
1606 | else | |
ccf5b801 | 1607 | atomic_inc(&intf->pm_usage_cnt); |
9bbdf1e0 AS |
1608 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
1609 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1610 | status); | |
1611 | if (status > 0) | |
1612 | status = 0; | |
9ac39f28 AS |
1613 | return status; |
1614 | } | |
1615 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface_async); | |
1616 | ||
9bbdf1e0 AS |
1617 | /** |
1618 | * usb_autopm_get_interface_no_resume - increment a USB interface's PM-usage counter | |
1619 | * @intf: the usb_interface whose counter should be incremented | |
1620 | * | |
1621 | * This routine increments @intf's usage counter but does not carry out an | |
1622 | * autoresume. | |
1623 | * | |
1624 | * This routine can run in atomic context. | |
1625 | */ | |
1626 | void usb_autopm_get_interface_no_resume(struct usb_interface *intf) | |
1627 | { | |
1628 | struct usb_device *udev = interface_to_usbdev(intf); | |
1629 | ||
1630 | udev->last_busy = jiffies; | |
1631 | atomic_inc(&intf->pm_usage_cnt); | |
1632 | pm_runtime_get_noresume(&intf->dev); | |
1633 | } | |
1634 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface_no_resume); | |
1635 | ||
1636 | /* Internal routine to check whether we may autosuspend a device. */ | |
1637 | static int autosuspend_check(struct usb_device *udev) | |
1638 | { | |
1639 | int i; | |
1640 | struct usb_interface *intf; | |
1641 | unsigned long suspend_time, j; | |
1642 | ||
1643 | /* Fail if autosuspend is disabled, or any interfaces are in use, or | |
1644 | * any interface drivers require remote wakeup but it isn't available. | |
1645 | */ | |
1646 | udev->do_remote_wakeup = device_may_wakeup(&udev->dev); | |
1647 | if (udev->actconfig) { | |
1648 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
1649 | intf = udev->actconfig->interface[i]; | |
1650 | ||
1651 | /* We don't need to check interfaces that are | |
1652 | * disabled for runtime PM. Either they are unbound | |
1653 | * or else their drivers don't support autosuspend | |
1654 | * and so they are permanently active. | |
1655 | */ | |
1656 | if (intf->dev.power.disable_depth) | |
1657 | continue; | |
1658 | if (atomic_read(&intf->dev.power.usage_count) > 0) | |
1659 | return -EBUSY; | |
1660 | if (intf->needs_remote_wakeup && | |
1661 | !udev->do_remote_wakeup) { | |
1662 | dev_dbg(&udev->dev, "remote wakeup needed " | |
1663 | "for autosuspend\n"); | |
1664 | return -EOPNOTSUPP; | |
1665 | } | |
1666 | ||
1667 | /* Don't allow autosuspend if the device will need | |
1668 | * a reset-resume and any of its interface drivers | |
1669 | * doesn't include support or needs remote wakeup. | |
1670 | */ | |
1671 | if (udev->quirks & USB_QUIRK_RESET_RESUME) { | |
1672 | struct usb_driver *driver; | |
1673 | ||
1674 | driver = to_usb_driver(intf->dev.driver); | |
1675 | if (!driver->reset_resume || | |
1676 | intf->needs_remote_wakeup) | |
1677 | return -EOPNOTSUPP; | |
1678 | } | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | /* If everything is okay but the device hasn't been idle for long | |
1683 | * enough, queue a delayed autosuspend request. | |
1684 | */ | |
1685 | j = ACCESS_ONCE(jiffies); | |
1686 | suspend_time = udev->last_busy + udev->autosuspend_delay; | |
1687 | if (time_before(j, suspend_time)) { | |
1688 | pm_schedule_suspend(&udev->dev, jiffies_to_msecs( | |
1689 | round_jiffies_up_relative(suspend_time - j))); | |
1690 | return -EAGAIN; | |
1691 | } | |
1692 | return 0; | |
1693 | } | |
1694 | ||
1695 | static int usb_runtime_suspend(struct device *dev) | |
1696 | { | |
1697 | int status = 0; | |
718efa64 | 1698 | |
9bbdf1e0 AS |
1699 | /* A USB device can be suspended if it passes the various autosuspend |
1700 | * checks. Runtime suspend for a USB device means suspending all the | |
1701 | * interfaces and then the device itself. | |
1702 | */ | |
1703 | if (is_usb_device(dev)) { | |
1704 | struct usb_device *udev = to_usb_device(dev); | |
1705 | ||
1706 | if (autosuspend_check(udev) != 0) | |
1707 | return -EAGAIN; | |
1708 | ||
1709 | status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND); | |
1710 | ||
1711 | /* If an interface fails the suspend, adjust the last_busy | |
1712 | * time so that we don't get another suspend attempt right | |
1713 | * away. | |
1714 | */ | |
1715 | if (status) { | |
1716 | udev->last_busy = jiffies + | |
1717 | (udev->autosuspend_delay == 0 ? | |
1718 | HZ/2 : 0); | |
1719 | } | |
1720 | ||
1721 | /* Prevent the parent from suspending immediately after */ | |
1722 | else if (udev->parent) { | |
1723 | udev->parent->last_busy = jiffies; | |
1724 | } | |
1725 | } | |
1726 | ||
1727 | /* Runtime suspend for a USB interface doesn't mean anything. */ | |
1728 | return status; | |
1729 | } | |
1730 | ||
1731 | static int usb_runtime_resume(struct device *dev) | |
1732 | { | |
1733 | /* Runtime resume for a USB device means resuming both the device | |
1734 | * and all its interfaces. | |
1735 | */ | |
1736 | if (is_usb_device(dev)) { | |
1737 | struct usb_device *udev = to_usb_device(dev); | |
1738 | int status; | |
1739 | ||
1740 | status = usb_resume_both(udev, PMSG_AUTO_RESUME); | |
1741 | udev->last_busy = jiffies; | |
1742 | return status; | |
1743 | } | |
1744 | ||
1745 | /* Runtime resume for a USB interface doesn't mean anything. */ | |
1746 | return 0; | |
1747 | } | |
1748 | ||
1749 | static int usb_runtime_idle(struct device *dev) | |
1750 | { | |
1751 | /* An idle USB device can be suspended if it passes the various | |
1752 | * autosuspend checks. An idle interface can be suspended at | |
1753 | * any time. | |
1754 | */ | |
1755 | if (is_usb_device(dev)) { | |
1756 | struct usb_device *udev = to_usb_device(dev); | |
1757 | ||
1758 | if (autosuspend_check(udev) != 0) | |
1759 | return 0; | |
1760 | } | |
1761 | ||
1762 | pm_runtime_suspend(dev); | |
1763 | return 0; | |
1764 | } | |
1765 | ||
1766 | static struct dev_pm_ops usb_bus_pm_ops = { | |
1767 | .runtime_suspend = usb_runtime_suspend, | |
1768 | .runtime_resume = usb_runtime_resume, | |
1769 | .runtime_idle = usb_runtime_idle, | |
1770 | }; | |
1771 | ||
1772 | #else | |
718efa64 | 1773 | |
9bbdf1e0 | 1774 | #define usb_bus_pm_ops (*(struct dev_pm_ops *) NULL) |
9ac39f28 | 1775 | |
645daaab | 1776 | #endif /* CONFIG_USB_SUSPEND */ |
a8e7c565 | 1777 | |
36e56a34 AS |
1778 | struct bus_type usb_bus_type = { |
1779 | .name = "usb", | |
1780 | .match = usb_device_match, | |
1781 | .uevent = usb_uevent, | |
9bbdf1e0 | 1782 | .pm = &usb_bus_pm_ops, |
36e56a34 | 1783 | }; |