Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/base/power/main.c - Where the driver meets power management. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * | |
10 | * The driver model core calls device_pm_add() when a device is registered. | |
11 | * This will intialize the embedded device_pm_info object in the device | |
12 | * and add it to the list of power-controlled devices. sysfs entries for | |
13 | * controlling device power management will also be added. | |
14 | * | |
1eede070 RW |
15 | * A separate list is used for keeping track of power info, because the power |
16 | * domain dependencies may differ from the ancestral dependencies that the | |
17 | * subsystem list maintains. | |
1da177e4 LT |
18 | */ |
19 | ||
1da177e4 | 20 | #include <linux/device.h> |
cd59abfc | 21 | #include <linux/kallsyms.h> |
11048dcf | 22 | #include <linux/mutex.h> |
cd59abfc AS |
23 | #include <linux/pm.h> |
24 | #include <linux/resume-trace.h> | |
775b64d2 | 25 | #include <linux/rwsem.h> |
11048dcf | 26 | |
cd59abfc | 27 | #include "../base.h" |
1da177e4 LT |
28 | #include "power.h" |
29 | ||
775b64d2 | 30 | /* |
1eede070 | 31 | * The entries in the dpm_list list are in a depth first order, simply |
775b64d2 RW |
32 | * because children are guaranteed to be discovered after parents, and |
33 | * are inserted at the back of the list on discovery. | |
34 | * | |
775b64d2 RW |
35 | * Since device_pm_add() may be called with a device semaphore held, |
36 | * we must never try to acquire a device semaphore while holding | |
37 | * dpm_list_mutex. | |
38 | */ | |
39 | ||
1eede070 | 40 | LIST_HEAD(dpm_list); |
1da177e4 | 41 | |
cd59abfc | 42 | static DEFINE_MUTEX(dpm_list_mtx); |
1da177e4 | 43 | |
1eede070 RW |
44 | /* |
45 | * Set once the preparation of devices for a PM transition has started, reset | |
46 | * before starting to resume devices. Protected by dpm_list_mtx. | |
47 | */ | |
48 | static bool transition_started; | |
49 | ||
50 | /** | |
51 | * device_pm_lock - lock the list of active devices used by the PM core | |
52 | */ | |
53 | void device_pm_lock(void) | |
54 | { | |
55 | mutex_lock(&dpm_list_mtx); | |
56 | } | |
57 | ||
58 | /** | |
59 | * device_pm_unlock - unlock the list of active devices used by the PM core | |
60 | */ | |
61 | void device_pm_unlock(void) | |
62 | { | |
63 | mutex_unlock(&dpm_list_mtx); | |
64 | } | |
075c1771 | 65 | |
775b64d2 RW |
66 | /** |
67 | * device_pm_add - add a device to the list of active devices | |
68 | * @dev: Device to be added to the list | |
69 | */ | |
3b98aeaf | 70 | void device_pm_add(struct device *dev) |
1da177e4 | 71 | { |
1da177e4 | 72 | pr_debug("PM: Adding info for %s:%s\n", |
c48ea603 DT |
73 | dev->bus ? dev->bus->name : "No Bus", |
74 | kobject_name(&dev->kobj)); | |
11048dcf | 75 | mutex_lock(&dpm_list_mtx); |
1eede070 | 76 | if (dev->parent) { |
f5a6d958 RW |
77 | if (dev->parent->power.status >= DPM_SUSPENDING) |
78 | dev_warn(dev, "parent %s should not be sleeping\n", | |
58aca232 | 79 | dev->parent->bus_id); |
1eede070 RW |
80 | } else if (transition_started) { |
81 | /* | |
82 | * We refuse to register parentless devices while a PM | |
83 | * transition is in progress in order to avoid leaving them | |
84 | * unhandled down the road | |
85 | */ | |
728f0893 | 86 | dev_WARN(dev, "Parentless device registered during a PM transaction\n"); |
58aca232 | 87 | } |
3b98aeaf AS |
88 | |
89 | list_add_tail(&dev->power.entry, &dpm_list); | |
11048dcf | 90 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
91 | } |
92 | ||
775b64d2 RW |
93 | /** |
94 | * device_pm_remove - remove a device from the list of active devices | |
95 | * @dev: Device to be removed from the list | |
96 | * | |
97 | * This function also removes the device's PM-related sysfs attributes. | |
98 | */ | |
9cddad77 | 99 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
100 | { |
101 | pr_debug("PM: Removing info for %s:%s\n", | |
c48ea603 DT |
102 | dev->bus ? dev->bus->name : "No Bus", |
103 | kobject_name(&dev->kobj)); | |
11048dcf | 104 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 105 | list_del_init(&dev->power.entry); |
11048dcf | 106 | mutex_unlock(&dpm_list_mtx); |
775b64d2 RW |
107 | } |
108 | ||
1eede070 RW |
109 | /** |
110 | * pm_op - execute the PM operation appropiate for given PM event | |
111 | * @dev: Device. | |
112 | * @ops: PM operations to choose from. | |
113 | * @state: PM transition of the system being carried out. | |
114 | */ | |
115 | static int pm_op(struct device *dev, struct pm_ops *ops, pm_message_t state) | |
116 | { | |
117 | int error = 0; | |
118 | ||
119 | switch (state.event) { | |
120 | #ifdef CONFIG_SUSPEND | |
121 | case PM_EVENT_SUSPEND: | |
122 | if (ops->suspend) { | |
123 | error = ops->suspend(dev); | |
124 | suspend_report_result(ops->suspend, error); | |
125 | } | |
126 | break; | |
127 | case PM_EVENT_RESUME: | |
128 | if (ops->resume) { | |
129 | error = ops->resume(dev); | |
130 | suspend_report_result(ops->resume, error); | |
131 | } | |
132 | break; | |
133 | #endif /* CONFIG_SUSPEND */ | |
134 | #ifdef CONFIG_HIBERNATION | |
135 | case PM_EVENT_FREEZE: | |
136 | case PM_EVENT_QUIESCE: | |
137 | if (ops->freeze) { | |
138 | error = ops->freeze(dev); | |
139 | suspend_report_result(ops->freeze, error); | |
140 | } | |
141 | break; | |
142 | case PM_EVENT_HIBERNATE: | |
143 | if (ops->poweroff) { | |
144 | error = ops->poweroff(dev); | |
145 | suspend_report_result(ops->poweroff, error); | |
146 | } | |
147 | break; | |
148 | case PM_EVENT_THAW: | |
149 | case PM_EVENT_RECOVER: | |
150 | if (ops->thaw) { | |
151 | error = ops->thaw(dev); | |
152 | suspend_report_result(ops->thaw, error); | |
153 | } | |
154 | break; | |
155 | case PM_EVENT_RESTORE: | |
156 | if (ops->restore) { | |
157 | error = ops->restore(dev); | |
158 | suspend_report_result(ops->restore, error); | |
159 | } | |
160 | break; | |
161 | #endif /* CONFIG_HIBERNATION */ | |
162 | default: | |
163 | error = -EINVAL; | |
164 | } | |
165 | return error; | |
166 | } | |
167 | ||
168 | /** | |
169 | * pm_noirq_op - execute the PM operation appropiate for given PM event | |
170 | * @dev: Device. | |
171 | * @ops: PM operations to choose from. | |
172 | * @state: PM transition of the system being carried out. | |
173 | * | |
174 | * The operation is executed with interrupts disabled by the only remaining | |
175 | * functional CPU in the system. | |
176 | */ | |
177 | static int pm_noirq_op(struct device *dev, struct pm_ext_ops *ops, | |
178 | pm_message_t state) | |
179 | { | |
180 | int error = 0; | |
181 | ||
182 | switch (state.event) { | |
183 | #ifdef CONFIG_SUSPEND | |
184 | case PM_EVENT_SUSPEND: | |
185 | if (ops->suspend_noirq) { | |
186 | error = ops->suspend_noirq(dev); | |
187 | suspend_report_result(ops->suspend_noirq, error); | |
188 | } | |
189 | break; | |
190 | case PM_EVENT_RESUME: | |
191 | if (ops->resume_noirq) { | |
192 | error = ops->resume_noirq(dev); | |
193 | suspend_report_result(ops->resume_noirq, error); | |
194 | } | |
195 | break; | |
196 | #endif /* CONFIG_SUSPEND */ | |
197 | #ifdef CONFIG_HIBERNATION | |
198 | case PM_EVENT_FREEZE: | |
199 | case PM_EVENT_QUIESCE: | |
200 | if (ops->freeze_noirq) { | |
201 | error = ops->freeze_noirq(dev); | |
202 | suspend_report_result(ops->freeze_noirq, error); | |
203 | } | |
204 | break; | |
205 | case PM_EVENT_HIBERNATE: | |
206 | if (ops->poweroff_noirq) { | |
207 | error = ops->poweroff_noirq(dev); | |
208 | suspend_report_result(ops->poweroff_noirq, error); | |
209 | } | |
210 | break; | |
211 | case PM_EVENT_THAW: | |
212 | case PM_EVENT_RECOVER: | |
213 | if (ops->thaw_noirq) { | |
214 | error = ops->thaw_noirq(dev); | |
215 | suspend_report_result(ops->thaw_noirq, error); | |
216 | } | |
217 | break; | |
218 | case PM_EVENT_RESTORE: | |
219 | if (ops->restore_noirq) { | |
220 | error = ops->restore_noirq(dev); | |
221 | suspend_report_result(ops->restore_noirq, error); | |
222 | } | |
223 | break; | |
224 | #endif /* CONFIG_HIBERNATION */ | |
225 | default: | |
226 | error = -EINVAL; | |
227 | } | |
228 | return error; | |
229 | } | |
230 | ||
231 | static char *pm_verb(int event) | |
232 | { | |
233 | switch (event) { | |
234 | case PM_EVENT_SUSPEND: | |
235 | return "suspend"; | |
236 | case PM_EVENT_RESUME: | |
237 | return "resume"; | |
238 | case PM_EVENT_FREEZE: | |
239 | return "freeze"; | |
240 | case PM_EVENT_QUIESCE: | |
241 | return "quiesce"; | |
242 | case PM_EVENT_HIBERNATE: | |
243 | return "hibernate"; | |
244 | case PM_EVENT_THAW: | |
245 | return "thaw"; | |
246 | case PM_EVENT_RESTORE: | |
247 | return "restore"; | |
248 | case PM_EVENT_RECOVER: | |
249 | return "recover"; | |
250 | default: | |
251 | return "(unknown PM event)"; | |
252 | } | |
253 | } | |
254 | ||
255 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) | |
256 | { | |
257 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
258 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
259 | ", may wakeup" : ""); | |
260 | } | |
261 | ||
262 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
263 | int error) | |
264 | { | |
265 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
266 | kobject_name(&dev->kobj), pm_verb(state.event), info, error); | |
267 | } | |
268 | ||
cd59abfc AS |
269 | /*------------------------- Resume routines -------------------------*/ |
270 | ||
271 | /** | |
1eede070 | 272 | * resume_device_noirq - Power on one device (early resume). |
cd59abfc | 273 | * @dev: Device. |
1eede070 | 274 | * @state: PM transition of the system being carried out. |
cd59abfc | 275 | * |
775b64d2 | 276 | * Must be called with interrupts disabled. |
cd59abfc | 277 | */ |
1eede070 | 278 | static int resume_device_noirq(struct device *dev, pm_message_t state) |
cd59abfc AS |
279 | { |
280 | int error = 0; | |
281 | ||
282 | TRACE_DEVICE(dev); | |
283 | TRACE_RESUME(0); | |
284 | ||
1eede070 RW |
285 | if (!dev->bus) |
286 | goto End; | |
287 | ||
288 | if (dev->bus->pm) { | |
289 | pm_dev_dbg(dev, state, "EARLY "); | |
290 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
291 | } else if (dev->bus->resume_early) { | |
292 | pm_dev_dbg(dev, state, "legacy EARLY "); | |
775b64d2 RW |
293 | error = dev->bus->resume_early(dev); |
294 | } | |
1eede070 | 295 | End: |
775b64d2 RW |
296 | TRACE_RESUME(error); |
297 | return error; | |
298 | } | |
299 | ||
300 | /** | |
301 | * dpm_power_up - Power on all regular (non-sysdev) devices. | |
1eede070 | 302 | * @state: PM transition of the system being carried out. |
775b64d2 | 303 | * |
1eede070 RW |
304 | * Execute the appropriate "noirq resume" callback for all devices marked |
305 | * as DPM_OFF_IRQ. | |
775b64d2 RW |
306 | * |
307 | * Must be called with interrupts disabled and only one CPU running. | |
308 | */ | |
1eede070 | 309 | static void dpm_power_up(pm_message_t state) |
775b64d2 | 310 | { |
1eede070 | 311 | struct device *dev; |
775b64d2 | 312 | |
1eede070 RW |
313 | list_for_each_entry(dev, &dpm_list, power.entry) |
314 | if (dev->power.status > DPM_OFF) { | |
315 | int error; | |
775b64d2 | 316 | |
1eede070 RW |
317 | dev->power.status = DPM_OFF; |
318 | error = resume_device_noirq(dev, state); | |
319 | if (error) | |
320 | pm_dev_err(dev, state, " early", error); | |
321 | } | |
775b64d2 RW |
322 | } |
323 | ||
324 | /** | |
325 | * device_power_up - Turn on all devices that need special attention. | |
1eede070 | 326 | * @state: PM transition of the system being carried out. |
775b64d2 RW |
327 | * |
328 | * Power on system devices, then devices that required we shut them down | |
329 | * with interrupts disabled. | |
330 | * | |
331 | * Must be called with interrupts disabled. | |
332 | */ | |
1eede070 | 333 | void device_power_up(pm_message_t state) |
775b64d2 RW |
334 | { |
335 | sysdev_resume(); | |
1eede070 | 336 | dpm_power_up(state); |
775b64d2 RW |
337 | } |
338 | EXPORT_SYMBOL_GPL(device_power_up); | |
339 | ||
340 | /** | |
341 | * resume_device - Restore state for one device. | |
342 | * @dev: Device. | |
1eede070 | 343 | * @state: PM transition of the system being carried out. |
775b64d2 | 344 | */ |
1eede070 | 345 | static int resume_device(struct device *dev, pm_message_t state) |
775b64d2 RW |
346 | { |
347 | int error = 0; | |
348 | ||
349 | TRACE_DEVICE(dev); | |
350 | TRACE_RESUME(0); | |
cd59abfc | 351 | |
7a8d37a3 RW |
352 | down(&dev->sem); |
353 | ||
1eede070 RW |
354 | if (dev->bus) { |
355 | if (dev->bus->pm) { | |
356 | pm_dev_dbg(dev, state, ""); | |
357 | error = pm_op(dev, &dev->bus->pm->base, state); | |
358 | } else if (dev->bus->resume) { | |
359 | pm_dev_dbg(dev, state, "legacy "); | |
360 | error = dev->bus->resume(dev); | |
361 | } | |
362 | if (error) | |
363 | goto End; | |
cd59abfc AS |
364 | } |
365 | ||
1eede070 RW |
366 | if (dev->type) { |
367 | if (dev->type->pm) { | |
368 | pm_dev_dbg(dev, state, "type "); | |
369 | error = pm_op(dev, dev->type->pm, state); | |
370 | } else if (dev->type->resume) { | |
371 | pm_dev_dbg(dev, state, "legacy type "); | |
372 | error = dev->type->resume(dev); | |
373 | } | |
374 | if (error) | |
375 | goto End; | |
cd59abfc AS |
376 | } |
377 | ||
1eede070 RW |
378 | if (dev->class) { |
379 | if (dev->class->pm) { | |
380 | pm_dev_dbg(dev, state, "class "); | |
381 | error = pm_op(dev, dev->class->pm, state); | |
382 | } else if (dev->class->resume) { | |
383 | pm_dev_dbg(dev, state, "legacy class "); | |
384 | error = dev->class->resume(dev); | |
385 | } | |
cd59abfc | 386 | } |
1eede070 | 387 | End: |
7a8d37a3 RW |
388 | up(&dev->sem); |
389 | ||
cd59abfc AS |
390 | TRACE_RESUME(error); |
391 | return error; | |
392 | } | |
393 | ||
775b64d2 RW |
394 | /** |
395 | * dpm_resume - Resume every device. | |
1eede070 | 396 | * @state: PM transition of the system being carried out. |
775b64d2 | 397 | * |
1eede070 RW |
398 | * Execute the appropriate "resume" callback for all devices the status of |
399 | * which indicates that they are inactive. | |
400 | */ | |
401 | static void dpm_resume(pm_message_t state) | |
402 | { | |
403 | struct list_head list; | |
404 | ||
405 | INIT_LIST_HEAD(&list); | |
406 | mutex_lock(&dpm_list_mtx); | |
407 | transition_started = false; | |
408 | while (!list_empty(&dpm_list)) { | |
409 | struct device *dev = to_device(dpm_list.next); | |
410 | ||
411 | get_device(dev); | |
412 | if (dev->power.status >= DPM_OFF) { | |
413 | int error; | |
414 | ||
415 | dev->power.status = DPM_RESUMING; | |
416 | mutex_unlock(&dpm_list_mtx); | |
417 | ||
418 | error = resume_device(dev, state); | |
419 | ||
420 | mutex_lock(&dpm_list_mtx); | |
421 | if (error) | |
422 | pm_dev_err(dev, state, "", error); | |
423 | } else if (dev->power.status == DPM_SUSPENDING) { | |
424 | /* Allow new children of the device to be registered */ | |
425 | dev->power.status = DPM_RESUMING; | |
426 | } | |
427 | if (!list_empty(&dev->power.entry)) | |
428 | list_move_tail(&dev->power.entry, &list); | |
429 | put_device(dev); | |
430 | } | |
431 | list_splice(&list, &dpm_list); | |
432 | mutex_unlock(&dpm_list_mtx); | |
433 | } | |
434 | ||
435 | /** | |
436 | * complete_device - Complete a PM transition for given device | |
437 | * @dev: Device. | |
438 | * @state: PM transition of the system being carried out. | |
439 | */ | |
440 | static void complete_device(struct device *dev, pm_message_t state) | |
441 | { | |
442 | down(&dev->sem); | |
443 | ||
444 | if (dev->class && dev->class->pm && dev->class->pm->complete) { | |
445 | pm_dev_dbg(dev, state, "completing class "); | |
446 | dev->class->pm->complete(dev); | |
447 | } | |
448 | ||
449 | if (dev->type && dev->type->pm && dev->type->pm->complete) { | |
450 | pm_dev_dbg(dev, state, "completing type "); | |
451 | dev->type->pm->complete(dev); | |
452 | } | |
453 | ||
454 | if (dev->bus && dev->bus->pm && dev->bus->pm->base.complete) { | |
455 | pm_dev_dbg(dev, state, "completing "); | |
456 | dev->bus->pm->base.complete(dev); | |
457 | } | |
458 | ||
459 | up(&dev->sem); | |
460 | } | |
461 | ||
462 | /** | |
463 | * dpm_complete - Complete a PM transition for all devices. | |
464 | * @state: PM transition of the system being carried out. | |
775b64d2 | 465 | * |
1eede070 RW |
466 | * Execute the ->complete() callbacks for all devices that are not marked |
467 | * as DPM_ON. | |
cd59abfc | 468 | */ |
1eede070 | 469 | static void dpm_complete(pm_message_t state) |
cd59abfc | 470 | { |
1eede070 RW |
471 | struct list_head list; |
472 | ||
473 | INIT_LIST_HEAD(&list); | |
cd59abfc | 474 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
475 | while (!list_empty(&dpm_list)) { |
476 | struct device *dev = to_device(dpm_list.prev); | |
cd59abfc | 477 | |
1eede070 RW |
478 | get_device(dev); |
479 | if (dev->power.status > DPM_ON) { | |
480 | dev->power.status = DPM_ON; | |
481 | mutex_unlock(&dpm_list_mtx); | |
482 | ||
483 | complete_device(dev, state); | |
484 | ||
485 | mutex_lock(&dpm_list_mtx); | |
486 | } | |
487 | if (!list_empty(&dev->power.entry)) | |
488 | list_move(&dev->power.entry, &list); | |
489 | put_device(dev); | |
cd59abfc | 490 | } |
1eede070 | 491 | list_splice(&list, &dpm_list); |
cd59abfc AS |
492 | mutex_unlock(&dpm_list_mtx); |
493 | } | |
494 | ||
cd59abfc | 495 | /** |
775b64d2 | 496 | * device_resume - Restore state of each device in system. |
1eede070 | 497 | * @state: PM transition of the system being carried out. |
cd59abfc | 498 | * |
775b64d2 RW |
499 | * Resume all the devices, unlock them all, and allow new |
500 | * devices to be registered once again. | |
cd59abfc | 501 | */ |
1eede070 | 502 | void device_resume(pm_message_t state) |
cd59abfc | 503 | { |
775b64d2 | 504 | might_sleep(); |
1eede070 RW |
505 | dpm_resume(state); |
506 | dpm_complete(state); | |
cd59abfc | 507 | } |
775b64d2 | 508 | EXPORT_SYMBOL_GPL(device_resume); |
cd59abfc AS |
509 | |
510 | ||
511 | /*------------------------- Suspend routines -------------------------*/ | |
512 | ||
1eede070 RW |
513 | /** |
514 | * resume_event - return a PM message representing the resume event | |
515 | * corresponding to given sleep state. | |
516 | * @sleep_state: PM message representing a sleep state. | |
517 | */ | |
518 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 519 | { |
1eede070 RW |
520 | switch (sleep_state.event) { |
521 | case PM_EVENT_SUSPEND: | |
522 | return PMSG_RESUME; | |
523 | case PM_EVENT_FREEZE: | |
524 | case PM_EVENT_QUIESCE: | |
525 | return PMSG_RECOVER; | |
526 | case PM_EVENT_HIBERNATE: | |
527 | return PMSG_RESTORE; | |
cd59abfc | 528 | } |
1eede070 | 529 | return PMSG_ON; |
cd59abfc AS |
530 | } |
531 | ||
532 | /** | |
1eede070 | 533 | * suspend_device_noirq - Shut down one device (late suspend). |
cd59abfc | 534 | * @dev: Device. |
1eede070 | 535 | * @state: PM transition of the system being carried out. |
775b64d2 RW |
536 | * |
537 | * This is called with interrupts off and only a single CPU running. | |
cd59abfc | 538 | */ |
1eede070 | 539 | static int suspend_device_noirq(struct device *dev, pm_message_t state) |
775b64d2 RW |
540 | { |
541 | int error = 0; | |
cd59abfc | 542 | |
1eede070 RW |
543 | if (!dev->bus) |
544 | return 0; | |
545 | ||
546 | if (dev->bus->pm) { | |
547 | pm_dev_dbg(dev, state, "LATE "); | |
548 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
549 | } else if (dev->bus->suspend_late) { | |
550 | pm_dev_dbg(dev, state, "legacy LATE "); | |
775b64d2 RW |
551 | error = dev->bus->suspend_late(dev, state); |
552 | suspend_report_result(dev->bus->suspend_late, error); | |
553 | } | |
554 | return error; | |
555 | } | |
556 | ||
557 | /** | |
558 | * device_power_down - Shut down special devices. | |
1eede070 | 559 | * @state: PM transition of the system being carried out. |
775b64d2 | 560 | * |
1eede070 | 561 | * Power down devices that require interrupts to be disabled. |
775b64d2 RW |
562 | * Then power down system devices. |
563 | * | |
564 | * Must be called with interrupts disabled and only one CPU running. | |
565 | */ | |
566 | int device_power_down(pm_message_t state) | |
567 | { | |
1eede070 | 568 | struct device *dev; |
775b64d2 RW |
569 | int error = 0; |
570 | ||
1eede070 RW |
571 | list_for_each_entry_reverse(dev, &dpm_list, power.entry) { |
572 | error = suspend_device_noirq(dev, state); | |
775b64d2 | 573 | if (error) { |
1eede070 | 574 | pm_dev_err(dev, state, " late", error); |
775b64d2 RW |
575 | break; |
576 | } | |
1eede070 | 577 | dev->power.status = DPM_OFF_IRQ; |
775b64d2 | 578 | } |
775b64d2 RW |
579 | if (!error) |
580 | error = sysdev_suspend(state); | |
581 | if (error) | |
1eede070 | 582 | dpm_power_up(resume_event(state)); |
775b64d2 RW |
583 | return error; |
584 | } | |
585 | EXPORT_SYMBOL_GPL(device_power_down); | |
586 | ||
587 | /** | |
588 | * suspend_device - Save state of one device. | |
589 | * @dev: Device. | |
1eede070 | 590 | * @state: PM transition of the system being carried out. |
775b64d2 | 591 | */ |
19e20c91 | 592 | static int suspend_device(struct device *dev, pm_message_t state) |
cd59abfc AS |
593 | { |
594 | int error = 0; | |
595 | ||
7a8d37a3 RW |
596 | down(&dev->sem); |
597 | ||
1eede070 RW |
598 | if (dev->class) { |
599 | if (dev->class->pm) { | |
600 | pm_dev_dbg(dev, state, "class "); | |
601 | error = pm_op(dev, dev->class->pm, state); | |
602 | } else if (dev->class->suspend) { | |
603 | pm_dev_dbg(dev, state, "legacy class "); | |
604 | error = dev->class->suspend(dev, state); | |
605 | suspend_report_result(dev->class->suspend, error); | |
606 | } | |
607 | if (error) | |
608 | goto End; | |
cd59abfc AS |
609 | } |
610 | ||
1eede070 RW |
611 | if (dev->type) { |
612 | if (dev->type->pm) { | |
613 | pm_dev_dbg(dev, state, "type "); | |
614 | error = pm_op(dev, dev->type->pm, state); | |
615 | } else if (dev->type->suspend) { | |
616 | pm_dev_dbg(dev, state, "legacy type "); | |
617 | error = dev->type->suspend(dev, state); | |
618 | suspend_report_result(dev->type->suspend, error); | |
619 | } | |
620 | if (error) | |
621 | goto End; | |
cd59abfc AS |
622 | } |
623 | ||
1eede070 RW |
624 | if (dev->bus) { |
625 | if (dev->bus->pm) { | |
626 | pm_dev_dbg(dev, state, ""); | |
627 | error = pm_op(dev, &dev->bus->pm->base, state); | |
628 | } else if (dev->bus->suspend) { | |
629 | pm_dev_dbg(dev, state, "legacy "); | |
630 | error = dev->bus->suspend(dev, state); | |
631 | suspend_report_result(dev->bus->suspend, error); | |
632 | } | |
cd59abfc | 633 | } |
1eede070 | 634 | End: |
7a8d37a3 RW |
635 | up(&dev->sem); |
636 | ||
cd59abfc AS |
637 | return error; |
638 | } | |
639 | ||
640 | /** | |
775b64d2 | 641 | * dpm_suspend - Suspend every device. |
1eede070 | 642 | * @state: PM transition of the system being carried out. |
cd59abfc | 643 | * |
1eede070 | 644 | * Execute the appropriate "suspend" callbacks for all devices. |
cd59abfc | 645 | */ |
775b64d2 | 646 | static int dpm_suspend(pm_message_t state) |
cd59abfc | 647 | { |
1eede070 | 648 | struct list_head list; |
cd59abfc AS |
649 | int error = 0; |
650 | ||
1eede070 | 651 | INIT_LIST_HEAD(&list); |
cd59abfc | 652 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
653 | while (!list_empty(&dpm_list)) { |
654 | struct device *dev = to_device(dpm_list.prev); | |
58aca232 | 655 | |
1eede070 | 656 | get_device(dev); |
cd59abfc | 657 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 658 | |
cd59abfc | 659 | error = suspend_device(dev, state); |
1eede070 | 660 | |
1b3cbec1 | 661 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 662 | if (error) { |
1eede070 RW |
663 | pm_dev_err(dev, state, "", error); |
664 | put_device(dev); | |
775b64d2 RW |
665 | break; |
666 | } | |
1eede070 | 667 | dev->power.status = DPM_OFF; |
7a8d37a3 | 668 | if (!list_empty(&dev->power.entry)) |
1eede070 RW |
669 | list_move(&dev->power.entry, &list); |
670 | put_device(dev); | |
cd59abfc | 671 | } |
1eede070 | 672 | list_splice(&list, dpm_list.prev); |
cd59abfc | 673 | mutex_unlock(&dpm_list_mtx); |
1eede070 RW |
674 | return error; |
675 | } | |
676 | ||
677 | /** | |
678 | * prepare_device - Execute the ->prepare() callback(s) for given device. | |
679 | * @dev: Device. | |
680 | * @state: PM transition of the system being carried out. | |
681 | */ | |
682 | static int prepare_device(struct device *dev, pm_message_t state) | |
683 | { | |
684 | int error = 0; | |
685 | ||
686 | down(&dev->sem); | |
687 | ||
688 | if (dev->bus && dev->bus->pm && dev->bus->pm->base.prepare) { | |
689 | pm_dev_dbg(dev, state, "preparing "); | |
690 | error = dev->bus->pm->base.prepare(dev); | |
691 | suspend_report_result(dev->bus->pm->base.prepare, error); | |
692 | if (error) | |
693 | goto End; | |
694 | } | |
695 | ||
696 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { | |
697 | pm_dev_dbg(dev, state, "preparing type "); | |
698 | error = dev->type->pm->prepare(dev); | |
699 | suspend_report_result(dev->type->pm->prepare, error); | |
700 | if (error) | |
701 | goto End; | |
702 | } | |
703 | ||
704 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { | |
705 | pm_dev_dbg(dev, state, "preparing class "); | |
706 | error = dev->class->pm->prepare(dev); | |
707 | suspend_report_result(dev->class->pm->prepare, error); | |
708 | } | |
709 | End: | |
710 | up(&dev->sem); | |
711 | ||
712 | return error; | |
713 | } | |
cd59abfc | 714 | |
1eede070 RW |
715 | /** |
716 | * dpm_prepare - Prepare all devices for a PM transition. | |
717 | * @state: PM transition of the system being carried out. | |
718 | * | |
719 | * Execute the ->prepare() callback for all devices. | |
720 | */ | |
721 | static int dpm_prepare(pm_message_t state) | |
722 | { | |
723 | struct list_head list; | |
724 | int error = 0; | |
725 | ||
726 | INIT_LIST_HEAD(&list); | |
727 | mutex_lock(&dpm_list_mtx); | |
728 | transition_started = true; | |
729 | while (!list_empty(&dpm_list)) { | |
730 | struct device *dev = to_device(dpm_list.next); | |
731 | ||
732 | get_device(dev); | |
733 | dev->power.status = DPM_PREPARING; | |
734 | mutex_unlock(&dpm_list_mtx); | |
735 | ||
736 | error = prepare_device(dev, state); | |
737 | ||
738 | mutex_lock(&dpm_list_mtx); | |
739 | if (error) { | |
740 | dev->power.status = DPM_ON; | |
741 | if (error == -EAGAIN) { | |
742 | put_device(dev); | |
743 | continue; | |
744 | } | |
745 | printk(KERN_ERR "PM: Failed to prepare device %s " | |
746 | "for power transition: error %d\n", | |
747 | kobject_name(&dev->kobj), error); | |
748 | put_device(dev); | |
749 | break; | |
750 | } | |
751 | dev->power.status = DPM_SUSPENDING; | |
752 | if (!list_empty(&dev->power.entry)) | |
753 | list_move_tail(&dev->power.entry, &list); | |
754 | put_device(dev); | |
755 | } | |
756 | list_splice(&list, &dpm_list); | |
757 | mutex_unlock(&dpm_list_mtx); | |
cd59abfc AS |
758 | return error; |
759 | } | |
760 | ||
775b64d2 RW |
761 | /** |
762 | * device_suspend - Save state and stop all devices in system. | |
1eede070 | 763 | * @state: PM transition of the system being carried out. |
775b64d2 | 764 | * |
1eede070 | 765 | * Prepare and suspend all devices. |
775b64d2 RW |
766 | */ |
767 | int device_suspend(pm_message_t state) | |
768 | { | |
769 | int error; | |
cd59abfc | 770 | |
775b64d2 | 771 | might_sleep(); |
1eede070 RW |
772 | error = dpm_prepare(state); |
773 | if (!error) | |
774 | error = dpm_suspend(state); | |
cd59abfc | 775 | return error; |
cd59abfc | 776 | } |
775b64d2 | 777 | EXPORT_SYMBOL_GPL(device_suspend); |
cd59abfc AS |
778 | |
779 | void __suspend_report_result(const char *function, void *fn, int ret) | |
780 | { | |
c80cfb04 BH |
781 | if (ret) |
782 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
783 | } |
784 | EXPORT_SYMBOL_GPL(__suspend_report_result); |