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 | 25 | #include <linux/device.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
ddae41be | 27 | #include <linux/usb.h> |
6bc6cff5 | 28 | #include <linux/usb/quirks.h> |
27729aad | 29 | #include <linux/usb/hcd.h> |
27729aad | 30 | |
ddae41be GKH |
31 | #include "usb.h" |
32 | ||
20dfdad7 | 33 | |
733260ff GKH |
34 | #ifdef CONFIG_HOTPLUG |
35 | ||
36 | /* | |
37 | * Adds a new dynamic USBdevice ID to this driver, | |
38 | * and cause the driver to probe for all devices again. | |
39 | */ | |
93bacefc GKH |
40 | ssize_t usb_store_new_id(struct usb_dynids *dynids, |
41 | struct device_driver *driver, | |
42 | const char *buf, size_t count) | |
733260ff | 43 | { |
733260ff GKH |
44 | struct usb_dynid *dynid; |
45 | u32 idVendor = 0; | |
46 | u32 idProduct = 0; | |
47 | int fields = 0; | |
1b21d5e1 | 48 | int retval = 0; |
733260ff GKH |
49 | |
50 | fields = sscanf(buf, "%x %x", &idVendor, &idProduct); | |
51 | if (fields < 2) | |
52 | return -EINVAL; | |
53 | ||
54 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
55 | if (!dynid) | |
56 | return -ENOMEM; | |
57 | ||
58 | INIT_LIST_HEAD(&dynid->node); | |
59 | dynid->id.idVendor = idVendor; | |
60 | dynid->id.idProduct = idProduct; | |
61 | dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE; | |
62 | ||
93bacefc | 63 | spin_lock(&dynids->lock); |
e5dd0115 | 64 | list_add_tail(&dynid->node, &dynids->list); |
93bacefc | 65 | spin_unlock(&dynids->lock); |
733260ff GKH |
66 | |
67 | if (get_driver(driver)) { | |
1b21d5e1 | 68 | retval = driver_attach(driver); |
733260ff GKH |
69 | put_driver(driver); |
70 | } | |
71 | ||
1b21d5e1 GKH |
72 | if (retval) |
73 | return retval; | |
733260ff GKH |
74 | return count; |
75 | } | |
93bacefc GKH |
76 | EXPORT_SYMBOL_GPL(usb_store_new_id); |
77 | ||
78 | static ssize_t store_new_id(struct device_driver *driver, | |
79 | const char *buf, size_t count) | |
80 | { | |
81 | struct usb_driver *usb_drv = to_usb_driver(driver); | |
82 | ||
83 | return usb_store_new_id(&usb_drv->dynids, driver, buf, count); | |
84 | } | |
733260ff GKH |
85 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); |
86 | ||
0c7a2b72 CR |
87 | /** |
88 | * store_remove_id - remove a USB device ID from this driver | |
89 | * @driver: target device driver | |
90 | * @buf: buffer for scanning device ID data | |
91 | * @count: input size | |
92 | * | |
93 | * Removes a dynamic usb device ID from this driver. | |
94 | */ | |
95 | static ssize_t | |
96 | store_remove_id(struct device_driver *driver, const char *buf, size_t count) | |
97 | { | |
98 | struct usb_dynid *dynid, *n; | |
99 | struct usb_driver *usb_driver = to_usb_driver(driver); | |
100 | u32 idVendor = 0; | |
101 | u32 idProduct = 0; | |
102 | int fields = 0; | |
103 | int retval = 0; | |
104 | ||
105 | fields = sscanf(buf, "%x %x", &idVendor, &idProduct); | |
106 | if (fields < 2) | |
107 | return -EINVAL; | |
108 | ||
109 | spin_lock(&usb_driver->dynids.lock); | |
110 | list_for_each_entry_safe(dynid, n, &usb_driver->dynids.list, node) { | |
111 | struct usb_device_id *id = &dynid->id; | |
112 | if ((id->idVendor == idVendor) && | |
113 | (id->idProduct == idProduct)) { | |
114 | list_del(&dynid->node); | |
115 | kfree(dynid); | |
116 | retval = 0; | |
117 | break; | |
118 | } | |
119 | } | |
120 | spin_unlock(&usb_driver->dynids.lock); | |
121 | ||
122 | if (retval) | |
123 | return retval; | |
124 | return count; | |
125 | } | |
126 | static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id); | |
127 | ||
733260ff GKH |
128 | static int usb_create_newid_file(struct usb_driver *usb_drv) |
129 | { | |
130 | int error = 0; | |
131 | ||
ba9dc657 GKH |
132 | if (usb_drv->no_dynamic_id) |
133 | goto exit; | |
134 | ||
733260ff | 135 | if (usb_drv->probe != NULL) |
15147ffd GKH |
136 | error = driver_create_file(&usb_drv->drvwrap.driver, |
137 | &driver_attr_new_id); | |
ba9dc657 | 138 | exit: |
733260ff GKH |
139 | return error; |
140 | } | |
141 | ||
ba9dc657 GKH |
142 | static void usb_remove_newid_file(struct usb_driver *usb_drv) |
143 | { | |
144 | if (usb_drv->no_dynamic_id) | |
145 | return; | |
146 | ||
147 | if (usb_drv->probe != NULL) | |
15147ffd GKH |
148 | driver_remove_file(&usb_drv->drvwrap.driver, |
149 | &driver_attr_new_id); | |
ba9dc657 GKH |
150 | } |
151 | ||
0c7a2b72 CR |
152 | static int |
153 | usb_create_removeid_file(struct usb_driver *drv) | |
154 | { | |
155 | int error = 0; | |
156 | if (drv->probe != NULL) | |
157 | error = driver_create_file(&drv->drvwrap.driver, | |
158 | &driver_attr_remove_id); | |
159 | return error; | |
160 | } | |
161 | ||
162 | static void usb_remove_removeid_file(struct usb_driver *drv) | |
163 | { | |
164 | driver_remove_file(&drv->drvwrap.driver, &driver_attr_remove_id); | |
165 | } | |
166 | ||
733260ff GKH |
167 | static void usb_free_dynids(struct usb_driver *usb_drv) |
168 | { | |
169 | struct usb_dynid *dynid, *n; | |
170 | ||
171 | spin_lock(&usb_drv->dynids.lock); | |
172 | list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) { | |
173 | list_del(&dynid->node); | |
174 | kfree(dynid); | |
175 | } | |
176 | spin_unlock(&usb_drv->dynids.lock); | |
177 | } | |
178 | #else | |
179 | static inline int usb_create_newid_file(struct usb_driver *usb_drv) | |
180 | { | |
181 | return 0; | |
182 | } | |
183 | ||
ba9dc657 GKH |
184 | static void usb_remove_newid_file(struct usb_driver *usb_drv) |
185 | { | |
186 | } | |
187 | ||
0c7a2b72 CR |
188 | static int |
189 | usb_create_removeid_file(struct usb_driver *drv) | |
190 | { | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static void usb_remove_removeid_file(struct usb_driver *drv) | |
195 | { | |
196 | } | |
197 | ||
733260ff GKH |
198 | static inline void usb_free_dynids(struct usb_driver *usb_drv) |
199 | { | |
200 | } | |
201 | #endif | |
202 | ||
203 | static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf, | |
204 | struct usb_driver *drv) | |
205 | { | |
206 | struct usb_dynid *dynid; | |
207 | ||
208 | spin_lock(&drv->dynids.lock); | |
209 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
210 | if (usb_match_one_id(intf, &dynid->id)) { | |
211 | spin_unlock(&drv->dynids.lock); | |
212 | return &dynid->id; | |
213 | } | |
214 | } | |
215 | spin_unlock(&drv->dynids.lock); | |
216 | return NULL; | |
217 | } | |
218 | ||
219 | ||
8bb54ab5 AS |
220 | /* called from driver core with dev locked */ |
221 | static int usb_probe_device(struct device *dev) | |
222 | { | |
223 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); | |
55129666 | 224 | struct usb_device *udev = to_usb_device(dev); |
9bbdf1e0 | 225 | int error = 0; |
8bb54ab5 | 226 | |
441b62c1 | 227 | dev_dbg(dev, "%s\n", __func__); |
8bb54ab5 | 228 | |
8bb54ab5 AS |
229 | /* TODO: Add real matching code */ |
230 | ||
645daaab AS |
231 | /* The device should always appear to be in use |
232 | * unless the driver suports autosuspend. | |
233 | */ | |
9bbdf1e0 AS |
234 | if (!udriver->supports_autosuspend) |
235 | error = usb_autoresume_device(udev); | |
645daaab | 236 | |
9bbdf1e0 AS |
237 | if (!error) |
238 | error = udriver->probe(udev); | |
8bb54ab5 AS |
239 | return error; |
240 | } | |
241 | ||
242 | /* called from driver core with dev locked */ | |
243 | static int usb_unbind_device(struct device *dev) | |
244 | { | |
9bbdf1e0 | 245 | struct usb_device *udev = to_usb_device(dev); |
8bb54ab5 AS |
246 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); |
247 | ||
9bbdf1e0 AS |
248 | udriver->disconnect(udev); |
249 | if (!udriver->supports_autosuspend) | |
250 | usb_autosuspend_device(udev); | |
8bb54ab5 AS |
251 | return 0; |
252 | } | |
253 | ||
dc023dce IPG |
254 | /* |
255 | * Cancel any pending scheduled resets | |
256 | * | |
257 | * [see usb_queue_reset_device()] | |
258 | * | |
259 | * Called after unconfiguring / when releasing interfaces. See | |
260 | * comments in __usb_queue_reset_device() regarding | |
261 | * udev->reset_running. | |
262 | */ | |
263 | static void usb_cancel_queued_reset(struct usb_interface *iface) | |
264 | { | |
265 | if (iface->reset_running == 0) | |
266 | cancel_work_sync(&iface->reset_ws); | |
267 | } | |
8bb54ab5 AS |
268 | |
269 | /* called from driver core with dev locked */ | |
ddae41be GKH |
270 | static int usb_probe_interface(struct device *dev) |
271 | { | |
8bb54ab5 | 272 | struct usb_driver *driver = to_usb_driver(dev->driver); |
55129666 KS |
273 | struct usb_interface *intf = to_usb_interface(dev); |
274 | struct usb_device *udev = interface_to_usbdev(intf); | |
ddae41be GKH |
275 | const struct usb_device_id *id; |
276 | int error = -ENODEV; | |
277 | ||
441b62c1 | 278 | dev_dbg(dev, "%s\n", __func__); |
ddae41be | 279 | |
78d9a487 | 280 | intf->needs_binding = 0; |
ddae41be | 281 | |
7cbe5dca | 282 | if (usb_device_is_owned(udev)) |
0f3dda9f | 283 | return error; |
7cbe5dca | 284 | |
2c044a48 GKH |
285 | if (udev->authorized == 0) { |
286 | dev_err(&intf->dev, "Device is not authorized for usage\n"); | |
0f3dda9f | 287 | return error; |
2c044a48 | 288 | } |
72230abb | 289 | |
ddae41be | 290 | id = usb_match_id(intf, driver->id_table); |
733260ff GKH |
291 | if (!id) |
292 | id = usb_match_dynamic_id(intf, driver); | |
0f3dda9f AS |
293 | if (!id) |
294 | return error; | |
55151d7d | 295 | |
0f3dda9f AS |
296 | dev_dbg(dev, "%s - got id\n", __func__); |
297 | ||
298 | error = usb_autoresume_device(udev); | |
299 | if (error) | |
300 | return error; | |
301 | ||
0f3dda9f | 302 | intf->condition = USB_INTERFACE_BINDING; |
645daaab | 303 | |
571dc79d | 304 | /* Probed interfaces are initially active. They are |
9bbdf1e0 AS |
305 | * runtime-PM-enabled only if the driver has autosuspend support. |
306 | * They are sensitive to their children's power states. | |
0f3dda9f | 307 | */ |
9bbdf1e0 AS |
308 | pm_runtime_set_active(dev); |
309 | pm_suspend_ignore_children(dev, false); | |
310 | if (driver->supports_autosuspend) | |
311 | pm_runtime_enable(dev); | |
0f3dda9f AS |
312 | |
313 | /* Carry out a deferred switch to altsetting 0 */ | |
314 | if (intf->needs_altsetting0) { | |
315 | error = usb_set_interface(udev, intf->altsetting[0]. | |
316 | desc.bInterfaceNumber, 0); | |
317 | if (error < 0) | |
318 | goto err; | |
319 | intf->needs_altsetting0 = 0; | |
ddae41be GKH |
320 | } |
321 | ||
0f3dda9f AS |
322 | error = driver->probe(intf, id); |
323 | if (error) | |
324 | goto err; | |
325 | ||
326 | intf->condition = USB_INTERFACE_BOUND; | |
327 | usb_autosuspend_device(udev); | |
ddae41be | 328 | return error; |
1e5ea5e3 | 329 | |
0f3dda9f | 330 | err: |
1e5ea5e3 ON |
331 | intf->needs_remote_wakeup = 0; |
332 | intf->condition = USB_INTERFACE_UNBOUND; | |
333 | usb_cancel_queued_reset(intf); | |
9bbdf1e0 AS |
334 | |
335 | /* Unbound interfaces are always runtime-PM-disabled and -suspended */ | |
89842ae6 AS |
336 | if (driver->supports_autosuspend) |
337 | pm_runtime_disable(dev); | |
9bbdf1e0 AS |
338 | pm_runtime_set_suspended(dev); |
339 | ||
1e5ea5e3 ON |
340 | usb_autosuspend_device(udev); |
341 | return error; | |
ddae41be GKH |
342 | } |
343 | ||
8bb54ab5 | 344 | /* called from driver core with dev locked */ |
ddae41be GKH |
345 | static int usb_unbind_interface(struct device *dev) |
346 | { | |
8bb54ab5 | 347 | struct usb_driver *driver = to_usb_driver(dev->driver); |
ddae41be | 348 | struct usb_interface *intf = to_usb_interface(dev); |
645daaab | 349 | struct usb_device *udev; |
1e5ea5e3 | 350 | int error, r; |
ddae41be GKH |
351 | |
352 | intf->condition = USB_INTERFACE_UNBINDING; | |
353 | ||
645daaab AS |
354 | /* Autoresume for set_interface call below */ |
355 | udev = interface_to_usbdev(intf); | |
94fcda1f | 356 | error = usb_autoresume_device(udev); |
645daaab | 357 | |
9da82bd4 AS |
358 | /* Terminate all URBs for this interface unless the driver |
359 | * supports "soft" unbinding. | |
360 | */ | |
361 | if (!driver->soft_unbind) | |
ddeac4e7 | 362 | usb_disable_interface(udev, intf, false); |
ddae41be | 363 | |
8bb54ab5 | 364 | driver->disconnect(intf); |
dc023dce | 365 | usb_cancel_queued_reset(intf); |
ddae41be | 366 | |
55151d7d AS |
367 | /* Reset other interface state. |
368 | * We cannot do a Set-Interface if the device is suspended or | |
369 | * if it is prepared for a system sleep (since installing a new | |
370 | * altsetting means creating new endpoint device entries). | |
371 | * When either of these happens, defer the Set-Interface. | |
372 | */ | |
2caf7fcd AS |
373 | if (intf->cur_altsetting->desc.bAlternateSetting == 0) { |
374 | /* Already in altsetting 0 so skip Set-Interface. | |
375 | * Just re-enable it without affecting the endpoint toggles. | |
376 | */ | |
377 | usb_enable_interface(udev, intf, false); | |
b8c76f6a | 378 | } else if (!error && !intf->dev.power.in_suspend) { |
1e5ea5e3 | 379 | r = usb_set_interface(udev, intf->altsetting[0]. |
55151d7d | 380 | desc.bInterfaceNumber, 0); |
1e5ea5e3 ON |
381 | if (r < 0) |
382 | intf->needs_altsetting0 = 1; | |
383 | } else { | |
55151d7d | 384 | intf->needs_altsetting0 = 1; |
1e5ea5e3 | 385 | } |
ddae41be | 386 | usb_set_intfdata(intf, NULL); |
645daaab | 387 | |
ddae41be | 388 | intf->condition = USB_INTERFACE_UNBOUND; |
645daaab AS |
389 | intf->needs_remote_wakeup = 0; |
390 | ||
9bbdf1e0 | 391 | /* Unbound interfaces are always runtime-PM-disabled and -suspended */ |
89842ae6 AS |
392 | if (driver->supports_autosuspend) |
393 | pm_runtime_disable(dev); | |
9bbdf1e0 AS |
394 | pm_runtime_set_suspended(dev); |
395 | ||
396 | /* Undo any residual pm_autopm_get_interface_* calls */ | |
397 | for (r = atomic_read(&intf->pm_usage_cnt); r > 0; --r) | |
398 | usb_autopm_put_interface_no_suspend(intf); | |
399 | atomic_set(&intf->pm_usage_cnt, 0); | |
400 | ||
645daaab | 401 | if (!error) |
94fcda1f | 402 | usb_autosuspend_device(udev); |
ddae41be GKH |
403 | |
404 | return 0; | |
405 | } | |
406 | ||
36e56a34 AS |
407 | /** |
408 | * usb_driver_claim_interface - bind a driver to an interface | |
409 | * @driver: the driver to be bound | |
410 | * @iface: the interface to which it will be bound; must be in the | |
411 | * usb device's active configuration | |
412 | * @priv: driver data associated with that interface | |
413 | * | |
414 | * This is used by usb device drivers that need to claim more than one | |
415 | * interface on a device when probing (audio and acm are current examples). | |
416 | * No device driver should directly modify internal usb_interface or | |
417 | * usb_device structure members. | |
418 | * | |
419 | * Few drivers should need to use this routine, since the most natural | |
420 | * way to bind to an interface is to return the private data from | |
421 | * the driver's probe() method. | |
422 | * | |
341487a8 GKH |
423 | * Callers must own the device lock, so driver probe() entries don't need |
424 | * extra locking, but other call contexts may need to explicitly claim that | |
425 | * lock. | |
36e56a34 AS |
426 | */ |
427 | int usb_driver_claim_interface(struct usb_driver *driver, | |
2c044a48 | 428 | struct usb_interface *iface, void *priv) |
36e56a34 AS |
429 | { |
430 | struct device *dev = &iface->dev; | |
1b21d5e1 | 431 | int retval = 0; |
36e56a34 AS |
432 | |
433 | if (dev->driver) | |
434 | return -EBUSY; | |
435 | ||
8bb54ab5 | 436 | dev->driver = &driver->drvwrap.driver; |
36e56a34 | 437 | usb_set_intfdata(iface, priv); |
78d9a487 | 438 | iface->needs_binding = 0; |
645daaab | 439 | |
36e56a34 | 440 | iface->condition = USB_INTERFACE_BOUND; |
9bbdf1e0 | 441 | |
89842ae6 AS |
442 | /* Claimed interfaces are initially inactive (suspended) and |
443 | * runtime-PM-enabled, but only if the driver has autosuspend | |
444 | * support. Otherwise they are marked active, to prevent the | |
445 | * device from being autosuspended, but left disabled. In either | |
446 | * case they are sensitive to their children's power states. | |
9bbdf1e0 | 447 | */ |
9bbdf1e0 AS |
448 | pm_suspend_ignore_children(dev, false); |
449 | if (driver->supports_autosuspend) | |
450 | pm_runtime_enable(dev); | |
89842ae6 AS |
451 | else |
452 | pm_runtime_set_active(dev); | |
36e56a34 AS |
453 | |
454 | /* if interface was already added, bind now; else let | |
455 | * the future device_add() bind it, bypassing probe() | |
456 | */ | |
457 | if (device_is_registered(dev)) | |
1b21d5e1 | 458 | retval = device_bind_driver(dev); |
36e56a34 | 459 | |
1b21d5e1 | 460 | return retval; |
36e56a34 | 461 | } |
782e70c6 | 462 | EXPORT_SYMBOL_GPL(usb_driver_claim_interface); |
36e56a34 AS |
463 | |
464 | /** | |
465 | * usb_driver_release_interface - unbind a driver from an interface | |
466 | * @driver: the driver to be unbound | |
467 | * @iface: the interface from which it will be unbound | |
468 | * | |
469 | * This can be used by drivers to release an interface without waiting | |
470 | * for their disconnect() methods to be called. In typical cases this | |
471 | * also causes the driver disconnect() method to be called. | |
472 | * | |
473 | * This call is synchronous, and may not be used in an interrupt context. | |
341487a8 GKH |
474 | * Callers must own the device lock, so driver disconnect() entries don't |
475 | * need extra locking, but other call contexts may need to explicitly claim | |
476 | * that lock. | |
36e56a34 AS |
477 | */ |
478 | void usb_driver_release_interface(struct usb_driver *driver, | |
479 | struct usb_interface *iface) | |
480 | { | |
481 | struct device *dev = &iface->dev; | |
482 | ||
483 | /* this should never happen, don't release something that's not ours */ | |
8bb54ab5 | 484 | if (!dev->driver || dev->driver != &driver->drvwrap.driver) |
36e56a34 AS |
485 | return; |
486 | ||
487 | /* don't release from within disconnect() */ | |
488 | if (iface->condition != USB_INTERFACE_BOUND) | |
489 | return; | |
91f8d063 | 490 | iface->condition = USB_INTERFACE_UNBINDING; |
36e56a34 | 491 | |
91f8d063 AS |
492 | /* Release via the driver core only if the interface |
493 | * has already been registered | |
494 | */ | |
36e56a34 | 495 | if (device_is_registered(dev)) { |
36e56a34 | 496 | device_release_driver(dev); |
dc023dce | 497 | } else { |
8e9394ce | 498 | device_lock(dev); |
91f8d063 AS |
499 | usb_unbind_interface(dev); |
500 | dev->driver = NULL; | |
8e9394ce | 501 | device_unlock(dev); |
36e56a34 | 502 | } |
36e56a34 | 503 | } |
782e70c6 | 504 | EXPORT_SYMBOL_GPL(usb_driver_release_interface); |
36e56a34 | 505 | |
733260ff | 506 | /* returns 0 if no match, 1 if match */ |
bb417020 | 507 | int usb_match_device(struct usb_device *dev, const struct usb_device_id *id) |
733260ff | 508 | { |
733260ff GKH |
509 | if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && |
510 | id->idVendor != le16_to_cpu(dev->descriptor.idVendor)) | |
511 | return 0; | |
512 | ||
513 | if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && | |
514 | id->idProduct != le16_to_cpu(dev->descriptor.idProduct)) | |
515 | return 0; | |
516 | ||
517 | /* No need to test id->bcdDevice_lo != 0, since 0 is never | |
518 | greater than any unsigned number. */ | |
519 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) && | |
520 | (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice))) | |
521 | return 0; | |
522 | ||
523 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && | |
524 | (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice))) | |
525 | return 0; | |
526 | ||
527 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) && | |
528 | (id->bDeviceClass != dev->descriptor.bDeviceClass)) | |
529 | return 0; | |
530 | ||
531 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) && | |
2c044a48 | 532 | (id->bDeviceSubClass != dev->descriptor.bDeviceSubClass)) |
733260ff GKH |
533 | return 0; |
534 | ||
535 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) && | |
536 | (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol)) | |
537 | return 0; | |
538 | ||
bb417020 GKH |
539 | return 1; |
540 | } | |
541 | ||
542 | /* returns 0 if no match, 1 if match */ | |
543 | int usb_match_one_id(struct usb_interface *interface, | |
544 | const struct usb_device_id *id) | |
545 | { | |
546 | struct usb_host_interface *intf; | |
547 | struct usb_device *dev; | |
548 | ||
549 | /* proc_connectinfo in devio.c may call us with id == NULL. */ | |
550 | if (id == NULL) | |
551 | return 0; | |
552 | ||
553 | intf = interface->cur_altsetting; | |
554 | dev = interface_to_usbdev(interface); | |
555 | ||
556 | if (!usb_match_device(dev, id)) | |
557 | return 0; | |
558 | ||
93c8bf45 AS |
559 | /* The interface class, subclass, and protocol should never be |
560 | * checked for a match if the device class is Vendor Specific, | |
561 | * unless the match record specifies the Vendor ID. */ | |
562 | if (dev->descriptor.bDeviceClass == USB_CLASS_VENDOR_SPEC && | |
563 | !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && | |
564 | (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS | | |
565 | USB_DEVICE_ID_MATCH_INT_SUBCLASS | | |
566 | USB_DEVICE_ID_MATCH_INT_PROTOCOL))) | |
567 | return 0; | |
568 | ||
733260ff GKH |
569 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) && |
570 | (id->bInterfaceClass != intf->desc.bInterfaceClass)) | |
571 | return 0; | |
572 | ||
573 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && | |
574 | (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass)) | |
575 | return 0; | |
576 | ||
577 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && | |
578 | (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol)) | |
579 | return 0; | |
580 | ||
581 | return 1; | |
582 | } | |
93bacefc GKH |
583 | EXPORT_SYMBOL_GPL(usb_match_one_id); |
584 | ||
ddae41be GKH |
585 | /** |
586 | * usb_match_id - find first usb_device_id matching device or interface | |
587 | * @interface: the interface of interest | |
588 | * @id: array of usb_device_id structures, terminated by zero entry | |
589 | * | |
590 | * usb_match_id searches an array of usb_device_id's and returns | |
591 | * the first one matching the device or interface, or null. | |
592 | * This is used when binding (or rebinding) a driver to an interface. | |
593 | * Most USB device drivers will use this indirectly, through the usb core, | |
594 | * but some layered driver frameworks use it directly. | |
595 | * These device tables are exported with MODULE_DEVICE_TABLE, through | |
596 | * modutils, to support the driver loading functionality of USB hotplugging. | |
597 | * | |
598 | * What Matches: | |
599 | * | |
600 | * The "match_flags" element in a usb_device_id controls which | |
601 | * members are used. If the corresponding bit is set, the | |
602 | * value in the device_id must match its corresponding member | |
603 | * in the device or interface descriptor, or else the device_id | |
604 | * does not match. | |
605 | * | |
606 | * "driver_info" is normally used only by device drivers, | |
607 | * but you can create a wildcard "matches anything" usb_device_id | |
608 | * as a driver's "modules.usbmap" entry if you provide an id with | |
609 | * only a nonzero "driver_info" field. If you do this, the USB device | |
610 | * driver's probe() routine should use additional intelligence to | |
611 | * decide whether to bind to the specified interface. | |
612 | * | |
613 | * What Makes Good usb_device_id Tables: | |
614 | * | |
615 | * The match algorithm is very simple, so that intelligence in | |
616 | * driver selection must come from smart driver id records. | |
617 | * Unless you have good reasons to use another selection policy, | |
618 | * provide match elements only in related groups, and order match | |
619 | * specifiers from specific to general. Use the macros provided | |
620 | * for that purpose if you can. | |
621 | * | |
622 | * The most specific match specifiers use device descriptor | |
623 | * data. These are commonly used with product-specific matches; | |
624 | * the USB_DEVICE macro lets you provide vendor and product IDs, | |
625 | * and you can also match against ranges of product revisions. | |
626 | * These are widely used for devices with application or vendor | |
627 | * specific bDeviceClass values. | |
628 | * | |
629 | * Matches based on device class/subclass/protocol specifications | |
630 | * are slightly more general; use the USB_DEVICE_INFO macro, or | |
631 | * its siblings. These are used with single-function devices | |
632 | * where bDeviceClass doesn't specify that each interface has | |
633 | * its own class. | |
634 | * | |
635 | * Matches based on interface class/subclass/protocol are the | |
636 | * most general; they let drivers bind to any interface on a | |
637 | * multiple-function device. Use the USB_INTERFACE_INFO | |
638 | * macro, or its siblings, to match class-per-interface style | |
93c8bf45 AS |
639 | * devices (as recorded in bInterfaceClass). |
640 | * | |
641 | * Note that an entry created by USB_INTERFACE_INFO won't match | |
642 | * any interface if the device class is set to Vendor-Specific. | |
643 | * This is deliberate; according to the USB spec the meanings of | |
644 | * the interface class/subclass/protocol for these devices are also | |
645 | * vendor-specific, and hence matching against a standard product | |
646 | * class wouldn't work anyway. If you really want to use an | |
647 | * interface-based match for such a device, create a match record | |
648 | * that also specifies the vendor ID. (Unforunately there isn't a | |
649 | * standard macro for creating records like this.) | |
ddae41be GKH |
650 | * |
651 | * Within those groups, remember that not all combinations are | |
652 | * meaningful. For example, don't give a product version range | |
653 | * without vendor and product IDs; or specify a protocol without | |
654 | * its associated class and subclass. | |
655 | */ | |
656 | const struct usb_device_id *usb_match_id(struct usb_interface *interface, | |
657 | const struct usb_device_id *id) | |
658 | { | |
ddae41be GKH |
659 | /* proc_connectinfo in devio.c may call us with id == NULL. */ |
660 | if (id == NULL) | |
661 | return NULL; | |
662 | ||
ddae41be GKH |
663 | /* It is important to check that id->driver_info is nonzero, |
664 | since an entry that is all zeroes except for a nonzero | |
665 | id->driver_info is the way to create an entry that | |
666 | indicates that the driver want to examine every | |
667 | device and interface. */ | |
de6f92b9 GKH |
668 | for (; id->idVendor || id->idProduct || id->bDeviceClass || |
669 | id->bInterfaceClass || id->driver_info; id++) { | |
733260ff GKH |
670 | if (usb_match_one_id(interface, id)) |
671 | return id; | |
ddae41be GKH |
672 | } |
673 | ||
674 | return NULL; | |
675 | } | |
782e70c6 | 676 | EXPORT_SYMBOL_GPL(usb_match_id); |
ddae41be | 677 | |
8bb22d2b | 678 | static int usb_device_match(struct device *dev, struct device_driver *drv) |
ddae41be | 679 | { |
8bb54ab5 AS |
680 | /* devices and interfaces are handled separately */ |
681 | if (is_usb_device(dev)) { | |
ddae41be | 682 | |
8bb54ab5 AS |
683 | /* interface drivers never match devices */ |
684 | if (!is_usb_device_driver(drv)) | |
685 | return 0; | |
ddae41be | 686 | |
8bb54ab5 | 687 | /* TODO: Add real matching code */ |
ddae41be GKH |
688 | return 1; |
689 | ||
55129666 | 690 | } else if (is_usb_interface(dev)) { |
8bb54ab5 AS |
691 | struct usb_interface *intf; |
692 | struct usb_driver *usb_drv; | |
693 | const struct usb_device_id *id; | |
694 | ||
695 | /* device drivers never match interfaces */ | |
696 | if (is_usb_device_driver(drv)) | |
697 | return 0; | |
698 | ||
699 | intf = to_usb_interface(dev); | |
700 | usb_drv = to_usb_driver(drv); | |
701 | ||
702 | id = usb_match_id(intf, usb_drv->id_table); | |
703 | if (id) | |
704 | return 1; | |
705 | ||
706 | id = usb_match_dynamic_id(intf, usb_drv); | |
707 | if (id) | |
708 | return 1; | |
709 | } | |
710 | ||
ddae41be GKH |
711 | return 0; |
712 | } | |
713 | ||
36e56a34 | 714 | #ifdef CONFIG_HOTPLUG |
7eff2e7a | 715 | static int usb_uevent(struct device *dev, struct kobj_uevent_env *env) |
36e56a34 | 716 | { |
36e56a34 | 717 | struct usb_device *usb_dev; |
36e56a34 | 718 | |
55129666 | 719 | if (is_usb_device(dev)) { |
782da727 | 720 | usb_dev = to_usb_device(dev); |
55129666 | 721 | } else if (is_usb_interface(dev)) { |
9f8b17e6 | 722 | struct usb_interface *intf = to_usb_interface(dev); |
55129666 | 723 | |
8bb54ab5 | 724 | usb_dev = interface_to_usbdev(intf); |
55129666 KS |
725 | } else { |
726 | return 0; | |
8bb54ab5 | 727 | } |
36e56a34 AS |
728 | |
729 | if (usb_dev->devnum < 0) { | |
cceffe93 | 730 | /* driver is often null here; dev_dbg() would oops */ |
7071a3ce | 731 | pr_debug("usb %s: already deleted?\n", dev_name(dev)); |
36e56a34 AS |
732 | return -ENODEV; |
733 | } | |
734 | if (!usb_dev->bus) { | |
7071a3ce | 735 | pr_debug("usb %s: bus removed?\n", dev_name(dev)); |
36e56a34 AS |
736 | return -ENODEV; |
737 | } | |
738 | ||
739 | #ifdef CONFIG_USB_DEVICEFS | |
740 | /* If this is available, userspace programs can directly read | |
741 | * all the device descriptors we don't tell them about. Or | |
9f8b17e6 | 742 | * act as usermode drivers. |
36e56a34 | 743 | */ |
7eff2e7a | 744 | if (add_uevent_var(env, "DEVICE=/proc/bus/usb/%03d/%03d", |
36e56a34 AS |
745 | usb_dev->bus->busnum, usb_dev->devnum)) |
746 | return -ENOMEM; | |
747 | #endif | |
748 | ||
749 | /* per-device configurations are common */ | |
7eff2e7a | 750 | if (add_uevent_var(env, "PRODUCT=%x/%x/%x", |
36e56a34 AS |
751 | le16_to_cpu(usb_dev->descriptor.idVendor), |
752 | le16_to_cpu(usb_dev->descriptor.idProduct), | |
753 | le16_to_cpu(usb_dev->descriptor.bcdDevice))) | |
754 | return -ENOMEM; | |
755 | ||
756 | /* class-based driver binding models */ | |
7eff2e7a | 757 | if (add_uevent_var(env, "TYPE=%d/%d/%d", |
36e56a34 AS |
758 | usb_dev->descriptor.bDeviceClass, |
759 | usb_dev->descriptor.bDeviceSubClass, | |
760 | usb_dev->descriptor.bDeviceProtocol)) | |
761 | return -ENOMEM; | |
762 | ||
36e56a34 AS |
763 | return 0; |
764 | } | |
765 | ||
766 | #else | |
767 | ||
7eff2e7a | 768 | static int usb_uevent(struct device *dev, struct kobj_uevent_env *env) |
36e56a34 AS |
769 | { |
770 | return -ENODEV; | |
771 | } | |
36e56a34 AS |
772 | #endif /* CONFIG_HOTPLUG */ |
773 | ||
ddae41be | 774 | /** |
8bb54ab5 AS |
775 | * usb_register_device_driver - register a USB device (not interface) driver |
776 | * @new_udriver: USB operations for the device driver | |
2143acc6 | 777 | * @owner: module owner of this driver. |
ddae41be | 778 | * |
8bb54ab5 AS |
779 | * Registers a USB device driver with the USB core. The list of |
780 | * unattached devices will be rescanned whenever a new driver is | |
781 | * added, allowing the new driver to attach to any recognized devices. | |
782 | * Returns a negative error code on failure and 0 on success. | |
783 | */ | |
784 | int usb_register_device_driver(struct usb_device_driver *new_udriver, | |
785 | struct module *owner) | |
786 | { | |
787 | int retval = 0; | |
788 | ||
789 | if (usb_disabled()) | |
790 | return -ENODEV; | |
791 | ||
792 | new_udriver->drvwrap.for_devices = 1; | |
793 | new_udriver->drvwrap.driver.name = (char *) new_udriver->name; | |
794 | new_udriver->drvwrap.driver.bus = &usb_bus_type; | |
795 | new_udriver->drvwrap.driver.probe = usb_probe_device; | |
796 | new_udriver->drvwrap.driver.remove = usb_unbind_device; | |
797 | new_udriver->drvwrap.driver.owner = owner; | |
798 | ||
799 | retval = driver_register(&new_udriver->drvwrap.driver); | |
800 | ||
801 | if (!retval) { | |
802 | pr_info("%s: registered new device driver %s\n", | |
803 | usbcore_name, new_udriver->name); | |
804 | usbfs_update_special(); | |
805 | } else { | |
806 | printk(KERN_ERR "%s: error %d registering device " | |
807 | " driver %s\n", | |
808 | usbcore_name, retval, new_udriver->name); | |
809 | } | |
810 | ||
811 | return retval; | |
812 | } | |
813 | EXPORT_SYMBOL_GPL(usb_register_device_driver); | |
814 | ||
815 | /** | |
816 | * usb_deregister_device_driver - unregister a USB device (not interface) driver | |
817 | * @udriver: USB operations of the device driver to unregister | |
818 | * Context: must be able to sleep | |
819 | * | |
820 | * Unlinks the specified driver from the internal USB driver list. | |
821 | */ | |
822 | void usb_deregister_device_driver(struct usb_device_driver *udriver) | |
823 | { | |
824 | pr_info("%s: deregistering device driver %s\n", | |
825 | usbcore_name, udriver->name); | |
826 | ||
827 | driver_unregister(&udriver->drvwrap.driver); | |
828 | usbfs_update_special(); | |
829 | } | |
830 | EXPORT_SYMBOL_GPL(usb_deregister_device_driver); | |
831 | ||
832 | /** | |
833 | * usb_register_driver - register a USB interface driver | |
834 | * @new_driver: USB operations for the interface driver | |
835 | * @owner: module owner of this driver. | |
892705a1 | 836 | * @mod_name: module name string |
8bb54ab5 AS |
837 | * |
838 | * Registers a USB interface driver with the USB core. The list of | |
839 | * unattached interfaces will be rescanned whenever a new driver is | |
840 | * added, allowing the new driver to attach to any recognized interfaces. | |
ddae41be GKH |
841 | * Returns a negative error code on failure and 0 on success. |
842 | * | |
843 | * NOTE: if you want your driver to use the USB major number, you must call | |
844 | * usb_register_dev() to enable that functionality. This function no longer | |
845 | * takes care of that. | |
846 | */ | |
80f745fb GKH |
847 | int usb_register_driver(struct usb_driver *new_driver, struct module *owner, |
848 | const char *mod_name) | |
ddae41be GKH |
849 | { |
850 | int retval = 0; | |
851 | ||
852 | if (usb_disabled()) | |
853 | return -ENODEV; | |
854 | ||
8bb54ab5 AS |
855 | new_driver->drvwrap.for_devices = 0; |
856 | new_driver->drvwrap.driver.name = (char *) new_driver->name; | |
857 | new_driver->drvwrap.driver.bus = &usb_bus_type; | |
858 | new_driver->drvwrap.driver.probe = usb_probe_interface; | |
859 | new_driver->drvwrap.driver.remove = usb_unbind_interface; | |
860 | new_driver->drvwrap.driver.owner = owner; | |
80f745fb | 861 | new_driver->drvwrap.driver.mod_name = mod_name; |
733260ff GKH |
862 | spin_lock_init(&new_driver->dynids.lock); |
863 | INIT_LIST_HEAD(&new_driver->dynids.list); | |
ddae41be | 864 | |
8bb54ab5 | 865 | retval = driver_register(&new_driver->drvwrap.driver); |
0c7a2b72 CR |
866 | if (retval) |
867 | goto out; | |
ddae41be | 868 | |
0c7a2b72 CR |
869 | usbfs_update_special(); |
870 | ||
871 | retval = usb_create_newid_file(new_driver); | |
872 | if (retval) | |
873 | goto out_newid; | |
874 | ||
875 | retval = usb_create_removeid_file(new_driver); | |
876 | if (retval) | |
877 | goto out_removeid; | |
878 | ||
879 | pr_info("%s: registered new interface driver %s\n", | |
ddae41be | 880 | usbcore_name, new_driver->name); |
ddae41be | 881 | |
0c7a2b72 | 882 | out: |
ddae41be | 883 | return retval; |
0c7a2b72 CR |
884 | |
885 | out_removeid: | |
886 | usb_remove_newid_file(new_driver); | |
887 | out_newid: | |
888 | driver_unregister(&new_driver->drvwrap.driver); | |
889 | ||
890 | printk(KERN_ERR "%s: error %d registering interface " | |
891 | " driver %s\n", | |
892 | usbcore_name, retval, new_driver->name); | |
893 | goto out; | |
ddae41be | 894 | } |
782e70c6 | 895 | EXPORT_SYMBOL_GPL(usb_register_driver); |
ddae41be GKH |
896 | |
897 | /** | |
8bb54ab5 AS |
898 | * usb_deregister - unregister a USB interface driver |
899 | * @driver: USB operations of the interface driver to unregister | |
ddae41be GKH |
900 | * Context: must be able to sleep |
901 | * | |
902 | * Unlinks the specified driver from the internal USB driver list. | |
903 | * | |
904 | * NOTE: If you called usb_register_dev(), you still need to call | |
905 | * usb_deregister_dev() to clean up your driver's allocated minor numbers, | |
906 | * this * call will no longer do it for you. | |
907 | */ | |
908 | void usb_deregister(struct usb_driver *driver) | |
909 | { | |
8bb54ab5 AS |
910 | pr_info("%s: deregistering interface driver %s\n", |
911 | usbcore_name, driver->name); | |
ddae41be | 912 | |
0c7a2b72 | 913 | usb_remove_removeid_file(driver); |
ba9dc657 | 914 | usb_remove_newid_file(driver); |
733260ff | 915 | usb_free_dynids(driver); |
8bb54ab5 | 916 | driver_unregister(&driver->drvwrap.driver); |
ddae41be GKH |
917 | |
918 | usbfs_update_special(); | |
919 | } | |
782e70c6 | 920 | EXPORT_SYMBOL_GPL(usb_deregister); |
36e56a34 | 921 | |
78d9a487 AS |
922 | /* Forced unbinding of a USB interface driver, either because |
923 | * it doesn't support pre_reset/post_reset/reset_resume or | |
924 | * because it doesn't support suspend/resume. | |
925 | * | |
926 | * The caller must hold @intf's device's lock, but not its pm_mutex | |
927 | * and not @intf->dev.sem. | |
928 | */ | |
929 | void usb_forced_unbind_intf(struct usb_interface *intf) | |
930 | { | |
931 | struct usb_driver *driver = to_usb_driver(intf->dev.driver); | |
932 | ||
933 | dev_dbg(&intf->dev, "forced unbind\n"); | |
934 | usb_driver_release_interface(driver, intf); | |
935 | ||
936 | /* Mark the interface for later rebinding */ | |
937 | intf->needs_binding = 1; | |
938 | } | |
939 | ||
940 | /* Delayed forced unbinding of a USB interface driver and scan | |
941 | * for rebinding. | |
942 | * | |
943 | * The caller must hold @intf's device's lock, but not its pm_mutex | |
944 | * and not @intf->dev.sem. | |
945 | * | |
5096aedc AS |
946 | * Note: Rebinds will be skipped if a system sleep transition is in |
947 | * progress and the PM "complete" callback hasn't occurred yet. | |
78d9a487 AS |
948 | */ |
949 | void usb_rebind_intf(struct usb_interface *intf) | |
950 | { | |
951 | int rc; | |
952 | ||
953 | /* Delayed unbind of an existing driver */ | |
954 | if (intf->dev.driver) { | |
955 | struct usb_driver *driver = | |
956 | to_usb_driver(intf->dev.driver); | |
957 | ||
958 | dev_dbg(&intf->dev, "forced unbind\n"); | |
959 | usb_driver_release_interface(driver, intf); | |
960 | } | |
961 | ||
962 | /* Try to rebind the interface */ | |
b8c76f6a | 963 | if (!intf->dev.power.in_suspend) { |
5096aedc AS |
964 | intf->needs_binding = 0; |
965 | rc = device_attach(&intf->dev); | |
966 | if (rc < 0) | |
967 | dev_warn(&intf->dev, "rebind failed: %d\n", rc); | |
968 | } | |
78d9a487 AS |
969 | } |
970 | ||
9ff78433 AS |
971 | #ifdef CONFIG_PM |
972 | ||
78d9a487 AS |
973 | #define DO_UNBIND 0 |
974 | #define DO_REBIND 1 | |
975 | ||
976 | /* Unbind drivers for @udev's interfaces that don't support suspend/resume, | |
977 | * or rebind interfaces that have been unbound, according to @action. | |
978 | * | |
979 | * The caller must hold @udev's device lock. | |
78d9a487 AS |
980 | */ |
981 | static void do_unbind_rebind(struct usb_device *udev, int action) | |
982 | { | |
983 | struct usb_host_config *config; | |
984 | int i; | |
985 | struct usb_interface *intf; | |
986 | struct usb_driver *drv; | |
987 | ||
988 | config = udev->actconfig; | |
989 | if (config) { | |
990 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { | |
991 | intf = config->interface[i]; | |
992 | switch (action) { | |
993 | case DO_UNBIND: | |
994 | if (intf->dev.driver) { | |
995 | drv = to_usb_driver(intf->dev.driver); | |
996 | if (!drv->suspend || !drv->resume) | |
997 | usb_forced_unbind_intf(intf); | |
998 | } | |
999 | break; | |
1000 | case DO_REBIND: | |
5096aedc | 1001 | if (intf->needs_binding) |
78d9a487 | 1002 | usb_rebind_intf(intf); |
78d9a487 AS |
1003 | break; |
1004 | } | |
1005 | } | |
1006 | } | |
1007 | } | |
1008 | ||
d5ec1686 | 1009 | static int usb_suspend_device(struct usb_device *udev, pm_message_t msg) |
36e56a34 | 1010 | { |
782da727 | 1011 | struct usb_device_driver *udriver; |
2bf4086d | 1012 | int status = 0; |
36e56a34 | 1013 | |
114b368c AS |
1014 | if (udev->state == USB_STATE_NOTATTACHED || |
1015 | udev->state == USB_STATE_SUSPENDED) | |
1016 | goto done; | |
1017 | ||
b6f6436d AS |
1018 | /* For devices that don't have a driver, we do a generic suspend. */ |
1019 | if (udev->dev.driver) | |
1020 | udriver = to_usb_device_driver(udev->dev.driver); | |
1021 | else { | |
645daaab | 1022 | udev->do_remote_wakeup = 0; |
b6f6436d | 1023 | udriver = &usb_generic_driver; |
1c5df7e7 | 1024 | } |
2bf4086d AS |
1025 | status = udriver->suspend(udev, msg); |
1026 | ||
20dfdad7 | 1027 | done: |
441b62c1 | 1028 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
2bf4086d | 1029 | return status; |
1cc8a25d AS |
1030 | } |
1031 | ||
65bfd296 | 1032 | static int usb_resume_device(struct usb_device *udev, pm_message_t msg) |
1cc8a25d AS |
1033 | { |
1034 | struct usb_device_driver *udriver; | |
2bf4086d | 1035 | int status = 0; |
36e56a34 | 1036 | |
0458d5b4 AS |
1037 | if (udev->state == USB_STATE_NOTATTACHED) |
1038 | goto done; | |
1cc8a25d | 1039 | |
1c5df7e7 AS |
1040 | /* Can't resume it if it doesn't have a driver. */ |
1041 | if (udev->dev.driver == NULL) { | |
1042 | status = -ENOTCONN; | |
2bf4086d | 1043 | goto done; |
1c5df7e7 AS |
1044 | } |
1045 | ||
6d19c009 AS |
1046 | /* Non-root devices on a full/low-speed bus must wait for their |
1047 | * companion high-speed root hub, in case a handoff is needed. | |
1048 | */ | |
1049 | if (!(msg.event & PM_EVENT_AUTO) && udev->parent && | |
1050 | udev->bus->hs_companion) | |
1051 | device_pm_wait_for_dev(&udev->dev, | |
1052 | &udev->bus->hs_companion->root_hub->dev); | |
1053 | ||
6bc6cff5 AS |
1054 | if (udev->quirks & USB_QUIRK_RESET_RESUME) |
1055 | udev->reset_resume = 1; | |
1056 | ||
1cc8a25d | 1057 | udriver = to_usb_device_driver(udev->dev.driver); |
65bfd296 | 1058 | status = udriver->resume(udev, msg); |
2bf4086d | 1059 | |
20dfdad7 | 1060 | done: |
441b62c1 | 1061 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
2bf4086d | 1062 | return status; |
1cc8a25d AS |
1063 | } |
1064 | ||
65605ae8 AS |
1065 | static int usb_suspend_interface(struct usb_device *udev, |
1066 | struct usb_interface *intf, pm_message_t msg) | |
1cc8a25d AS |
1067 | { |
1068 | struct usb_driver *driver; | |
2bf4086d | 1069 | int status = 0; |
1cc8a25d | 1070 | |
9bbdf1e0 AS |
1071 | if (udev->state == USB_STATE_NOTATTACHED || |
1072 | intf->condition == USB_INTERFACE_UNBOUND) | |
2bf4086d | 1073 | goto done; |
114b368c | 1074 | driver = to_usb_driver(intf->dev.driver); |
36e56a34 | 1075 | |
78d9a487 | 1076 | if (driver->suspend) { |
1cc8a25d | 1077 | status = driver->suspend(intf, msg); |
9bbdf1e0 | 1078 | if (status && !(msg.event & PM_EVENT_AUTO)) |
1cc8a25d AS |
1079 | dev_err(&intf->dev, "%s error %d\n", |
1080 | "suspend", status); | |
36e56a34 | 1081 | } else { |
78d9a487 AS |
1082 | /* Later we will unbind the driver and reprobe */ |
1083 | intf->needs_binding = 1; | |
1084 | dev_warn(&intf->dev, "no %s for driver %s?\n", | |
1085 | "suspend", driver->name); | |
36e56a34 | 1086 | } |
2bf4086d | 1087 | |
20dfdad7 | 1088 | done: |
441b62c1 | 1089 | dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status); |
36e56a34 AS |
1090 | return status; |
1091 | } | |
1092 | ||
65605ae8 | 1093 | static int usb_resume_interface(struct usb_device *udev, |
65bfd296 | 1094 | struct usb_interface *intf, pm_message_t msg, int reset_resume) |
36e56a34 | 1095 | { |
1cc8a25d | 1096 | struct usb_driver *driver; |
2bf4086d | 1097 | int status = 0; |
36e56a34 | 1098 | |
9bbdf1e0 | 1099 | if (udev->state == USB_STATE_NOTATTACHED) |
2bf4086d | 1100 | goto done; |
36e56a34 | 1101 | |
645daaab AS |
1102 | /* Don't let autoresume interfere with unbinding */ |
1103 | if (intf->condition == USB_INTERFACE_UNBINDING) | |
1104 | goto done; | |
1105 | ||
1c5df7e7 | 1106 | /* Can't resume it if it doesn't have a driver. */ |
55151d7d AS |
1107 | if (intf->condition == USB_INTERFACE_UNBOUND) { |
1108 | ||
1109 | /* Carry out a deferred switch to altsetting 0 */ | |
b8c76f6a | 1110 | if (intf->needs_altsetting0 && !intf->dev.power.in_suspend) { |
55151d7d AS |
1111 | usb_set_interface(udev, intf->altsetting[0]. |
1112 | desc.bInterfaceNumber, 0); | |
1113 | intf->needs_altsetting0 = 0; | |
1114 | } | |
78d9a487 | 1115 | goto done; |
55151d7d | 1116 | } |
78d9a487 AS |
1117 | |
1118 | /* Don't resume if the interface is marked for rebinding */ | |
1119 | if (intf->needs_binding) | |
2bf4086d | 1120 | goto done; |
1cc8a25d | 1121 | driver = to_usb_driver(intf->dev.driver); |
36e56a34 | 1122 | |
f07600cf AS |
1123 | if (reset_resume) { |
1124 | if (driver->reset_resume) { | |
1125 | status = driver->reset_resume(intf); | |
1126 | if (status) | |
1127 | dev_err(&intf->dev, "%s error %d\n", | |
1128 | "reset_resume", status); | |
1129 | } else { | |
78d9a487 | 1130 | intf->needs_binding = 1; |
f07600cf AS |
1131 | dev_warn(&intf->dev, "no %s for driver %s?\n", |
1132 | "reset_resume", driver->name); | |
1133 | } | |
1134 | } else { | |
1135 | if (driver->resume) { | |
1136 | status = driver->resume(intf); | |
1137 | if (status) | |
1138 | dev_err(&intf->dev, "%s error %d\n", | |
1139 | "resume", status); | |
1140 | } else { | |
78d9a487 | 1141 | intf->needs_binding = 1; |
f07600cf AS |
1142 | dev_warn(&intf->dev, "no %s for driver %s?\n", |
1143 | "resume", driver->name); | |
1144 | } | |
1145 | } | |
2bf4086d AS |
1146 | |
1147 | done: | |
441b62c1 | 1148 | dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status); |
f07600cf | 1149 | |
78d9a487 | 1150 | /* Later we will unbind the driver and/or reprobe, if necessary */ |
2bf4086d | 1151 | return status; |
36e56a34 AS |
1152 | } |
1153 | ||
645daaab AS |
1154 | /** |
1155 | * usb_suspend_both - suspend a USB device and its interfaces | |
1156 | * @udev: the usb_device to suspend | |
1157 | * @msg: Power Management message describing this state transition | |
1158 | * | |
1159 | * This is the central routine for suspending USB devices. It calls the | |
1160 | * suspend methods for all the interface drivers in @udev and then calls | |
1161 | * the suspend method for @udev itself. If an error occurs at any stage, | |
1162 | * all the interfaces which were suspended are resumed so that they remain | |
1163 | * in the same state as the device. | |
1164 | * | |
9bbdf1e0 AS |
1165 | * Autosuspend requests originating from a child device or an interface |
1166 | * driver may be made without the protection of @udev's device lock, but | |
1167 | * all other suspend calls will hold the lock. Usbcore will insure that | |
1168 | * method calls do not arrive during bind, unbind, or reset operations. | |
1169 | * However drivers must be prepared to handle suspend calls arriving at | |
1170 | * unpredictable times. | |
645daaab AS |
1171 | * |
1172 | * This routine can run only in process context. | |
1173 | */ | |
718efa64 | 1174 | static int usb_suspend_both(struct usb_device *udev, pm_message_t msg) |
a8e7c565 AS |
1175 | { |
1176 | int status = 0; | |
571dc79d | 1177 | int i = 0, n = 0; |
a8e7c565 | 1178 | struct usb_interface *intf; |
645daaab | 1179 | |
1941044a AS |
1180 | if (udev->state == USB_STATE_NOTATTACHED || |
1181 | udev->state == USB_STATE_SUSPENDED) | |
1182 | goto done; | |
a8e7c565 | 1183 | |
645daaab | 1184 | /* Suspend all the interfaces and then udev itself */ |
a8e7c565 | 1185 | if (udev->actconfig) { |
571dc79d AS |
1186 | n = udev->actconfig->desc.bNumInterfaces; |
1187 | for (i = n - 1; i >= 0; --i) { | |
a8e7c565 | 1188 | intf = udev->actconfig->interface[i]; |
65605ae8 | 1189 | status = usb_suspend_interface(udev, intf, msg); |
a8e7c565 AS |
1190 | if (status != 0) |
1191 | break; | |
1192 | } | |
1193 | } | |
5ad4f71e | 1194 | if (status == 0) |
d5ec1686 | 1195 | status = usb_suspend_device(udev, msg); |
a8e7c565 AS |
1196 | |
1197 | /* If the suspend failed, resume interfaces that did get suspended */ | |
1198 | if (status != 0) { | |
9bbdf1e0 | 1199 | msg.event ^= (PM_EVENT_SUSPEND | PM_EVENT_RESUME); |
571dc79d | 1200 | while (++i < n) { |
a8e7c565 | 1201 | intf = udev->actconfig->interface[i]; |
9bbdf1e0 | 1202 | usb_resume_interface(udev, intf, msg, 0); |
a8e7c565 | 1203 | } |
645daaab | 1204 | |
9bbdf1e0 AS |
1205 | /* If the suspend succeeded then prevent any more URB submissions |
1206 | * and flush any outstanding URBs. | |
6840d255 | 1207 | */ |
ef7f6c70 | 1208 | } else { |
6840d255 AS |
1209 | udev->can_submit = 0; |
1210 | for (i = 0; i < 16; ++i) { | |
1211 | usb_hcd_flush_endpoint(udev, udev->ep_out[i]); | |
1212 | usb_hcd_flush_endpoint(udev, udev->ep_in[i]); | |
1213 | } | |
ef7f6c70 | 1214 | } |
645daaab | 1215 | |
1941044a | 1216 | done: |
441b62c1 | 1217 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
a8e7c565 AS |
1218 | return status; |
1219 | } | |
1220 | ||
645daaab AS |
1221 | /** |
1222 | * usb_resume_both - resume a USB device and its interfaces | |
1223 | * @udev: the usb_device to resume | |
65bfd296 | 1224 | * @msg: Power Management message describing this state transition |
645daaab AS |
1225 | * |
1226 | * This is the central routine for resuming USB devices. It calls the | |
1227 | * the resume method for @udev and then calls the resume methods for all | |
1228 | * the interface drivers in @udev. | |
1229 | * | |
9bbdf1e0 AS |
1230 | * Autoresume requests originating from a child device or an interface |
1231 | * driver may be made without the protection of @udev's device lock, but | |
1232 | * all other resume calls will hold the lock. Usbcore will insure that | |
1233 | * method calls do not arrive during bind, unbind, or reset operations. | |
1234 | * However drivers must be prepared to handle resume calls arriving at | |
1235 | * unpredictable times. | |
645daaab AS |
1236 | * |
1237 | * This routine can run only in process context. | |
1238 | */ | |
65bfd296 | 1239 | static int usb_resume_both(struct usb_device *udev, pm_message_t msg) |
a8e7c565 | 1240 | { |
645daaab | 1241 | int status = 0; |
a8e7c565 AS |
1242 | int i; |
1243 | struct usb_interface *intf; | |
645daaab | 1244 | |
1941044a AS |
1245 | if (udev->state == USB_STATE_NOTATTACHED) { |
1246 | status = -ENODEV; | |
1247 | goto done; | |
1248 | } | |
6840d255 | 1249 | udev->can_submit = 1; |
a8e7c565 | 1250 | |
9bbdf1e0 AS |
1251 | /* Resume the device */ |
1252 | if (udev->state == USB_STATE_SUSPENDED || udev->reset_resume) | |
65bfd296 | 1253 | status = usb_resume_device(udev, msg); |
114b368c | 1254 | |
9bbdf1e0 | 1255 | /* Resume the interfaces */ |
a8e7c565 AS |
1256 | if (status == 0 && udev->actconfig) { |
1257 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
1258 | intf = udev->actconfig->interface[i]; | |
65bfd296 AS |
1259 | usb_resume_interface(udev, intf, msg, |
1260 | udev->reset_resume); | |
a8e7c565 AS |
1261 | } |
1262 | } | |
c08512c7 | 1263 | usb_mark_last_busy(udev); |
645daaab | 1264 | |
1941044a | 1265 | done: |
441b62c1 | 1266 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
70a1c9e0 AS |
1267 | if (!status) |
1268 | udev->reset_resume = 0; | |
645daaab AS |
1269 | return status; |
1270 | } | |
1271 | ||
5f677f1d AS |
1272 | static void choose_wakeup(struct usb_device *udev, pm_message_t msg) |
1273 | { | |
48826626 | 1274 | int w; |
5f677f1d AS |
1275 | |
1276 | /* Remote wakeup is needed only when we actually go to sleep. | |
1277 | * For things like FREEZE and QUIESCE, if the device is already | |
1278 | * autosuspended then its current wakeup setting is okay. | |
1279 | */ | |
1280 | if (msg.event == PM_EVENT_FREEZE || msg.event == PM_EVENT_QUIESCE) { | |
1281 | if (udev->state != USB_STATE_SUSPENDED) | |
1282 | udev->do_remote_wakeup = 0; | |
1283 | return; | |
1284 | } | |
1285 | ||
48826626 | 1286 | /* Enable remote wakeup if it is allowed, even if no interface drivers |
5f677f1d AS |
1287 | * actually want it. |
1288 | */ | |
48826626 | 1289 | w = device_may_wakeup(&udev->dev); |
5f677f1d AS |
1290 | |
1291 | /* If the device is autosuspended with the wrong wakeup setting, | |
1292 | * autoresume now so the setting can be changed. | |
1293 | */ | |
1294 | if (udev->state == USB_STATE_SUSPENDED && w != udev->do_remote_wakeup) | |
1295 | pm_runtime_resume(&udev->dev); | |
1296 | udev->do_remote_wakeup = w; | |
1297 | } | |
1298 | ||
9bbdf1e0 | 1299 | /* The device lock is held by the PM core */ |
0c590e23 AS |
1300 | int usb_suspend(struct device *dev, pm_message_t msg) |
1301 | { | |
9bbdf1e0 | 1302 | struct usb_device *udev = to_usb_device(dev); |
0c590e23 | 1303 | |
9bbdf1e0 | 1304 | do_unbind_rebind(udev, DO_UNBIND); |
5f677f1d | 1305 | choose_wakeup(udev, msg); |
9bbdf1e0 | 1306 | return usb_suspend_both(udev, msg); |
0c590e23 AS |
1307 | } |
1308 | ||
9bbdf1e0 | 1309 | /* The device lock is held by the PM core */ |
0c590e23 AS |
1310 | int usb_resume(struct device *dev, pm_message_t msg) |
1311 | { | |
9bbdf1e0 | 1312 | struct usb_device *udev = to_usb_device(dev); |
0c590e23 AS |
1313 | int status; |
1314 | ||
9bbdf1e0 AS |
1315 | /* For PM complete calls, all we do is rebind interfaces */ |
1316 | if (msg.event == PM_EVENT_ON) { | |
1317 | if (udev->state != USB_STATE_NOTATTACHED) | |
1318 | do_unbind_rebind(udev, DO_REBIND); | |
1319 | status = 0; | |
0c590e23 | 1320 | |
9bbdf1e0 AS |
1321 | /* For all other calls, take the device back to full power and |
1322 | * tell the PM core in case it was autosuspended previously. | |
c043f124 | 1323 | * Unbind the interfaces that will need rebinding later. |
0c590e23 | 1324 | */ |
9bbdf1e0 AS |
1325 | } else { |
1326 | status = usb_resume_both(udev, msg); | |
1327 | if (status == 0) { | |
1328 | pm_runtime_disable(dev); | |
1329 | pm_runtime_set_active(dev); | |
1330 | pm_runtime_enable(dev); | |
c043f124 | 1331 | do_unbind_rebind(udev, DO_REBIND); |
9bbdf1e0 AS |
1332 | } |
1333 | } | |
0c590e23 AS |
1334 | |
1335 | /* Avoid PM error messages for devices disconnected while suspended | |
1336 | * as we'll display regular disconnect messages just a bit later. | |
1337 | */ | |
7491f133 | 1338 | if (status == -ENODEV || status == -ESHUTDOWN) |
9bbdf1e0 | 1339 | status = 0; |
0c590e23 AS |
1340 | return status; |
1341 | } | |
1342 | ||
1343 | #endif /* CONFIG_PM */ | |
1344 | ||
645daaab AS |
1345 | #ifdef CONFIG_USB_SUSPEND |
1346 | ||
088f7fec AS |
1347 | /** |
1348 | * usb_enable_autosuspend - allow a USB device to be autosuspended | |
1349 | * @udev: the USB device which may be autosuspended | |
1350 | * | |
1351 | * This routine allows @udev to be autosuspended. An autosuspend won't | |
1352 | * take place until the autosuspend_delay has elapsed and all the other | |
1353 | * necessary conditions are satisfied. | |
1354 | * | |
1355 | * The caller must hold @udev's device lock. | |
1356 | */ | |
9e18c821 | 1357 | void usb_enable_autosuspend(struct usb_device *udev) |
088f7fec | 1358 | { |
9e18c821 | 1359 | pm_runtime_allow(&udev->dev); |
088f7fec AS |
1360 | } |
1361 | EXPORT_SYMBOL_GPL(usb_enable_autosuspend); | |
1362 | ||
1363 | /** | |
1364 | * usb_disable_autosuspend - prevent a USB device from being autosuspended | |
1365 | * @udev: the USB device which may not be autosuspended | |
1366 | * | |
1367 | * This routine prevents @udev from being autosuspended and wakes it up | |
1368 | * if it is already autosuspended. | |
1369 | * | |
1370 | * The caller must hold @udev's device lock. | |
1371 | */ | |
9e18c821 | 1372 | void usb_disable_autosuspend(struct usb_device *udev) |
088f7fec | 1373 | { |
9e18c821 | 1374 | pm_runtime_forbid(&udev->dev); |
088f7fec AS |
1375 | } |
1376 | EXPORT_SYMBOL_GPL(usb_disable_autosuspend); | |
1377 | ||
645daaab AS |
1378 | /** |
1379 | * usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces | |
701f35af | 1380 | * @udev: the usb_device to autosuspend |
645daaab AS |
1381 | * |
1382 | * This routine should be called when a core subsystem is finished using | |
1383 | * @udev and wants to allow it to autosuspend. Examples would be when | |
1384 | * @udev's device file in usbfs is closed or after a configuration change. | |
1385 | * | |
9bbdf1e0 AS |
1386 | * @udev's usage counter is decremented; if it drops to 0 and all the |
1387 | * interfaces are inactive then a delayed autosuspend will be attempted. | |
1388 | * The attempt may fail (see autosuspend_check()). | |
645daaab | 1389 | * |
62e299e6 | 1390 | * The caller must hold @udev's device lock. |
645daaab AS |
1391 | * |
1392 | * This routine can run only in process context. | |
1393 | */ | |
94fcda1f | 1394 | void usb_autosuspend_device(struct usb_device *udev) |
645daaab | 1395 | { |
94fcda1f AS |
1396 | int status; |
1397 | ||
6ddf27cd | 1398 | usb_mark_last_busy(udev); |
fcc4a01e | 1399 | status = pm_runtime_put_sync_autosuspend(&udev->dev); |
9bbdf1e0 AS |
1400 | dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n", |
1401 | __func__, atomic_read(&udev->dev.power.usage_count), | |
1402 | status); | |
645daaab AS |
1403 | } |
1404 | ||
1405 | /** | |
1406 | * usb_autoresume_device - immediately autoresume a USB device and its interfaces | |
701f35af | 1407 | * @udev: the usb_device to autoresume |
645daaab AS |
1408 | * |
1409 | * This routine should be called when a core subsystem wants to use @udev | |
94fcda1f | 1410 | * and needs to guarantee that it is not suspended. No autosuspend will |
9bbdf1e0 AS |
1411 | * occur until usb_autosuspend_device() is called. (Note that this will |
1412 | * not prevent suspend events originating in the PM core.) Examples would | |
1413 | * be when @udev's device file in usbfs is opened or when a remote-wakeup | |
94fcda1f | 1414 | * request is received. |
645daaab | 1415 | * |
94fcda1f AS |
1416 | * @udev's usage counter is incremented to prevent subsequent autosuspends. |
1417 | * However if the autoresume fails then the usage counter is re-decremented. | |
645daaab | 1418 | * |
62e299e6 | 1419 | * The caller must hold @udev's device lock. |
645daaab AS |
1420 | * |
1421 | * This routine can run only in process context. | |
1422 | */ | |
94fcda1f | 1423 | int usb_autoresume_device(struct usb_device *udev) |
645daaab AS |
1424 | { |
1425 | int status; | |
1426 | ||
9bbdf1e0 AS |
1427 | status = pm_runtime_get_sync(&udev->dev); |
1428 | if (status < 0) | |
1429 | pm_runtime_put_sync(&udev->dev); | |
1430 | dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n", | |
1431 | __func__, atomic_read(&udev->dev.power.usage_count), | |
1432 | status); | |
1433 | if (status > 0) | |
1434 | status = 0; | |
af4f7606 AS |
1435 | return status; |
1436 | } | |
1437 | ||
645daaab AS |
1438 | /** |
1439 | * usb_autopm_put_interface - decrement a USB interface's PM-usage counter | |
701f35af | 1440 | * @intf: the usb_interface whose counter should be decremented |
645daaab AS |
1441 | * |
1442 | * This routine should be called by an interface driver when it is | |
1443 | * finished using @intf and wants to allow it to autosuspend. A typical | |
1444 | * example would be a character-device driver when its device file is | |
1445 | * closed. | |
1446 | * | |
1447 | * The routine decrements @intf's usage counter. When the counter reaches | |
9bbdf1e0 AS |
1448 | * 0, a delayed autosuspend request for @intf's device is attempted. The |
1449 | * attempt may fail (see autosuspend_check()). | |
645daaab | 1450 | * |
645daaab AS |
1451 | * This routine can run only in process context. |
1452 | */ | |
1453 | void usb_autopm_put_interface(struct usb_interface *intf) | |
1454 | { | |
9bbdf1e0 AS |
1455 | struct usb_device *udev = interface_to_usbdev(intf); |
1456 | int status; | |
645daaab | 1457 | |
6ddf27cd | 1458 | usb_mark_last_busy(udev); |
9bbdf1e0 AS |
1459 | atomic_dec(&intf->pm_usage_cnt); |
1460 | status = pm_runtime_put_sync(&intf->dev); | |
1461 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", | |
1462 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1463 | status); | |
645daaab AS |
1464 | } |
1465 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface); | |
1466 | ||
9ac39f28 AS |
1467 | /** |
1468 | * usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter | |
1469 | * @intf: the usb_interface whose counter should be decremented | |
1470 | * | |
9bbdf1e0 AS |
1471 | * This routine does much the same thing as usb_autopm_put_interface(): |
1472 | * It decrements @intf's usage counter and schedules a delayed | |
1473 | * autosuspend request if the counter is <= 0. The difference is that it | |
1474 | * does not perform any synchronization; callers should hold a private | |
1475 | * lock and handle all synchronization issues themselves. | |
9ac39f28 AS |
1476 | * |
1477 | * Typically a driver would call this routine during an URB's completion | |
1478 | * handler, if no more URBs were pending. | |
1479 | * | |
1480 | * This routine can run in atomic context. | |
1481 | */ | |
1482 | void usb_autopm_put_interface_async(struct usb_interface *intf) | |
1483 | { | |
1484 | struct usb_device *udev = interface_to_usbdev(intf); | |
fcc4a01e | 1485 | int status; |
9ac39f28 | 1486 | |
6ddf27cd | 1487 | usb_mark_last_busy(udev); |
9bbdf1e0 | 1488 | atomic_dec(&intf->pm_usage_cnt); |
fcc4a01e | 1489 | status = pm_runtime_put(&intf->dev); |
9bbdf1e0 AS |
1490 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
1491 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1492 | status); | |
9ac39f28 AS |
1493 | } |
1494 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async); | |
1495 | ||
9bbdf1e0 AS |
1496 | /** |
1497 | * usb_autopm_put_interface_no_suspend - decrement a USB interface's PM-usage counter | |
1498 | * @intf: the usb_interface whose counter should be decremented | |
1499 | * | |
1500 | * This routine decrements @intf's usage counter but does not carry out an | |
1501 | * autosuspend. | |
1502 | * | |
1503 | * This routine can run in atomic context. | |
1504 | */ | |
1505 | void usb_autopm_put_interface_no_suspend(struct usb_interface *intf) | |
1506 | { | |
1507 | struct usb_device *udev = interface_to_usbdev(intf); | |
1508 | ||
6ddf27cd | 1509 | usb_mark_last_busy(udev); |
9bbdf1e0 AS |
1510 | atomic_dec(&intf->pm_usage_cnt); |
1511 | pm_runtime_put_noidle(&intf->dev); | |
1512 | } | |
1513 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface_no_suspend); | |
1514 | ||
645daaab AS |
1515 | /** |
1516 | * usb_autopm_get_interface - increment a USB interface's PM-usage counter | |
701f35af | 1517 | * @intf: the usb_interface whose counter should be incremented |
645daaab AS |
1518 | * |
1519 | * This routine should be called by an interface driver when it wants to | |
1520 | * use @intf and needs to guarantee that it is not suspended. In addition, | |
1521 | * the routine prevents @intf from being autosuspended subsequently. (Note | |
1522 | * that this will not prevent suspend events originating in the PM core.) | |
1523 | * This prevention will persist until usb_autopm_put_interface() is called | |
1524 | * or @intf is unbound. A typical example would be a character-device | |
1525 | * driver when its device file is opened. | |
1526 | * | |
9bbdf1e0 AS |
1527 | * @intf's usage counter is incremented to prevent subsequent autosuspends. |
1528 | * However if the autoresume fails then the counter is re-decremented. | |
645daaab AS |
1529 | * |
1530 | * This routine can run only in process context. | |
1531 | */ | |
1532 | int usb_autopm_get_interface(struct usb_interface *intf) | |
1533 | { | |
af4f7606 | 1534 | int status; |
645daaab | 1535 | |
9bbdf1e0 AS |
1536 | status = pm_runtime_get_sync(&intf->dev); |
1537 | if (status < 0) | |
1538 | pm_runtime_put_sync(&intf->dev); | |
1539 | else | |
1540 | atomic_inc(&intf->pm_usage_cnt); | |
1541 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", | |
1542 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1543 | status); | |
1544 | if (status > 0) | |
1545 | status = 0; | |
a8e7c565 AS |
1546 | return status; |
1547 | } | |
645daaab AS |
1548 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface); |
1549 | ||
9ac39f28 AS |
1550 | /** |
1551 | * usb_autopm_get_interface_async - increment a USB interface's PM-usage counter | |
1552 | * @intf: the usb_interface whose counter should be incremented | |
1553 | * | |
1554 | * This routine does much the same thing as | |
9bbdf1e0 AS |
1555 | * usb_autopm_get_interface(): It increments @intf's usage counter and |
1556 | * queues an autoresume request if the device is suspended. The | |
1557 | * differences are that it does not perform any synchronization (callers | |
1558 | * should hold a private lock and handle all synchronization issues | |
1559 | * themselves), and it does not autoresume the device directly (it only | |
1560 | * queues a request). After a successful call, the device may not yet be | |
1561 | * resumed. | |
9ac39f28 AS |
1562 | * |
1563 | * This routine can run in atomic context. | |
1564 | */ | |
1565 | int usb_autopm_get_interface_async(struct usb_interface *intf) | |
1566 | { | |
63defa73 | 1567 | int status; |
9bbdf1e0 | 1568 | |
63defa73 | 1569 | status = pm_runtime_get(&intf->dev); |
9bbdf1e0 AS |
1570 | if (status < 0 && status != -EINPROGRESS) |
1571 | pm_runtime_put_noidle(&intf->dev); | |
1572 | else | |
ccf5b801 | 1573 | atomic_inc(&intf->pm_usage_cnt); |
9bbdf1e0 AS |
1574 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
1575 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1576 | status); | |
1577 | if (status > 0) | |
1578 | status = 0; | |
9ac39f28 AS |
1579 | return status; |
1580 | } | |
1581 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface_async); | |
1582 | ||
9bbdf1e0 AS |
1583 | /** |
1584 | * usb_autopm_get_interface_no_resume - increment a USB interface's PM-usage counter | |
1585 | * @intf: the usb_interface whose counter should be incremented | |
1586 | * | |
1587 | * This routine increments @intf's usage counter but does not carry out an | |
1588 | * autoresume. | |
1589 | * | |
1590 | * This routine can run in atomic context. | |
1591 | */ | |
1592 | void usb_autopm_get_interface_no_resume(struct usb_interface *intf) | |
1593 | { | |
1594 | struct usb_device *udev = interface_to_usbdev(intf); | |
1595 | ||
6ddf27cd | 1596 | usb_mark_last_busy(udev); |
9bbdf1e0 AS |
1597 | atomic_inc(&intf->pm_usage_cnt); |
1598 | pm_runtime_get_noresume(&intf->dev); | |
1599 | } | |
1600 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface_no_resume); | |
1601 | ||
1602 | /* Internal routine to check whether we may autosuspend a device. */ | |
1603 | static int autosuspend_check(struct usb_device *udev) | |
1604 | { | |
7560d32e | 1605 | int w, i; |
9bbdf1e0 | 1606 | struct usb_interface *intf; |
9bbdf1e0 AS |
1607 | |
1608 | /* Fail if autosuspend is disabled, or any interfaces are in use, or | |
1609 | * any interface drivers require remote wakeup but it isn't available. | |
1610 | */ | |
7560d32e | 1611 | w = 0; |
9bbdf1e0 AS |
1612 | if (udev->actconfig) { |
1613 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
1614 | intf = udev->actconfig->interface[i]; | |
1615 | ||
1616 | /* We don't need to check interfaces that are | |
1617 | * disabled for runtime PM. Either they are unbound | |
1618 | * or else their drivers don't support autosuspend | |
1619 | * and so they are permanently active. | |
1620 | */ | |
1621 | if (intf->dev.power.disable_depth) | |
1622 | continue; | |
1623 | if (atomic_read(&intf->dev.power.usage_count) > 0) | |
1624 | return -EBUSY; | |
7560d32e | 1625 | w |= intf->needs_remote_wakeup; |
9bbdf1e0 AS |
1626 | |
1627 | /* Don't allow autosuspend if the device will need | |
1628 | * a reset-resume and any of its interface drivers | |
1629 | * doesn't include support or needs remote wakeup. | |
1630 | */ | |
1631 | if (udev->quirks & USB_QUIRK_RESET_RESUME) { | |
1632 | struct usb_driver *driver; | |
1633 | ||
1634 | driver = to_usb_driver(intf->dev.driver); | |
1635 | if (!driver->reset_resume || | |
1636 | intf->needs_remote_wakeup) | |
1637 | return -EOPNOTSUPP; | |
1638 | } | |
1639 | } | |
1640 | } | |
7560d32e AS |
1641 | if (w && !device_can_wakeup(&udev->dev)) { |
1642 | dev_dbg(&udev->dev, "remote wakeup needed for autosuspend\n"); | |
1643 | return -EOPNOTSUPP; | |
1644 | } | |
1645 | udev->do_remote_wakeup = w; | |
9bbdf1e0 AS |
1646 | return 0; |
1647 | } | |
1648 | ||
1649 | static int usb_runtime_suspend(struct device *dev) | |
1650 | { | |
63defa73 ML |
1651 | struct usb_device *udev = to_usb_device(dev); |
1652 | int status; | |
718efa64 | 1653 | |
9bbdf1e0 AS |
1654 | /* A USB device can be suspended if it passes the various autosuspend |
1655 | * checks. Runtime suspend for a USB device means suspending all the | |
1656 | * interfaces and then the device itself. | |
1657 | */ | |
63defa73 ML |
1658 | if (autosuspend_check(udev) != 0) |
1659 | return -EAGAIN; | |
9bbdf1e0 | 1660 | |
63defa73 | 1661 | status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND); |
9bbdf1e0 AS |
1662 | return status; |
1663 | } | |
1664 | ||
1665 | static int usb_runtime_resume(struct device *dev) | |
1666 | { | |
63defa73 ML |
1667 | struct usb_device *udev = to_usb_device(dev); |
1668 | int status; | |
1669 | ||
9bbdf1e0 AS |
1670 | /* Runtime resume for a USB device means resuming both the device |
1671 | * and all its interfaces. | |
1672 | */ | |
63defa73 | 1673 | status = usb_resume_both(udev, PMSG_AUTO_RESUME); |
63defa73 | 1674 | return status; |
9bbdf1e0 AS |
1675 | } |
1676 | ||
1677 | static int usb_runtime_idle(struct device *dev) | |
1678 | { | |
63defa73 ML |
1679 | struct usb_device *udev = to_usb_device(dev); |
1680 | ||
9bbdf1e0 | 1681 | /* An idle USB device can be suspended if it passes the various |
63defa73 | 1682 | * autosuspend checks. |
9bbdf1e0 | 1683 | */ |
63defa73 | 1684 | if (autosuspend_check(udev) == 0) |
fcc4a01e | 1685 | pm_runtime_autosuspend(dev); |
9bbdf1e0 AS |
1686 | return 0; |
1687 | } | |
1688 | ||
16be5725 | 1689 | static const struct dev_pm_ops usb_bus_pm_ops = { |
9bbdf1e0 AS |
1690 | .runtime_suspend = usb_runtime_suspend, |
1691 | .runtime_resume = usb_runtime_resume, | |
1692 | .runtime_idle = usb_runtime_idle, | |
1693 | }; | |
1694 | ||
645daaab | 1695 | #endif /* CONFIG_USB_SUSPEND */ |
a8e7c565 | 1696 | |
36e56a34 AS |
1697 | struct bus_type usb_bus_type = { |
1698 | .name = "usb", | |
1699 | .match = usb_device_match, | |
1700 | .uevent = usb_uevent, | |
b409214c | 1701 | #ifdef CONFIG_USB_SUSPEND |
9bbdf1e0 | 1702 | .pm = &usb_bus_pm_ops, |
b409214c | 1703 | #endif |
36e56a34 | 1704 | }; |