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Commit | Line | Data |
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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 | 23 | #include <linux/pm.h> |
5e928f77 | 24 | #include <linux/pm_runtime.h> |
cd59abfc | 25 | #include <linux/resume-trace.h> |
2ed8d2b3 | 26 | #include <linux/interrupt.h> |
f2511774 | 27 | #include <linux/sched.h> |
5af84b82 | 28 | #include <linux/async.h> |
11048dcf | 29 | |
cd59abfc | 30 | #include "../base.h" |
1da177e4 LT |
31 | #include "power.h" |
32 | ||
775b64d2 | 33 | /* |
1eede070 | 34 | * The entries in the dpm_list list are in a depth first order, simply |
775b64d2 RW |
35 | * because children are guaranteed to be discovered after parents, and |
36 | * are inserted at the back of the list on discovery. | |
37 | * | |
8e9394ce GKH |
38 | * Since device_pm_add() may be called with a device lock held, |
39 | * we must never try to acquire a device lock while holding | |
775b64d2 RW |
40 | * dpm_list_mutex. |
41 | */ | |
42 | ||
1eede070 | 43 | LIST_HEAD(dpm_list); |
1da177e4 | 44 | |
cd59abfc | 45 | static DEFINE_MUTEX(dpm_list_mtx); |
5af84b82 | 46 | static pm_message_t pm_transition; |
1da177e4 | 47 | |
1eede070 RW |
48 | /* |
49 | * Set once the preparation of devices for a PM transition has started, reset | |
50 | * before starting to resume devices. Protected by dpm_list_mtx. | |
51 | */ | |
52 | static bool transition_started; | |
53 | ||
5e928f77 | 54 | /** |
20d652d7 | 55 | * device_pm_init - Initialize the PM-related part of a device object. |
5e928f77 RW |
56 | * @dev: Device object being initialized. |
57 | */ | |
58 | void device_pm_init(struct device *dev) | |
59 | { | |
60 | dev->power.status = DPM_ON; | |
5af84b82 | 61 | init_completion(&dev->power.completion); |
152e1d59 | 62 | complete_all(&dev->power.completion); |
c125e96f | 63 | dev->power.wakeup_count = 0; |
5e928f77 RW |
64 | pm_runtime_init(dev); |
65 | } | |
66 | ||
1eede070 | 67 | /** |
20d652d7 | 68 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
69 | */ |
70 | void device_pm_lock(void) | |
71 | { | |
72 | mutex_lock(&dpm_list_mtx); | |
73 | } | |
74 | ||
75 | /** | |
20d652d7 | 76 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
77 | */ |
78 | void device_pm_unlock(void) | |
79 | { | |
80 | mutex_unlock(&dpm_list_mtx); | |
81 | } | |
075c1771 | 82 | |
775b64d2 | 83 | /** |
20d652d7 RW |
84 | * device_pm_add - Add a device to the PM core's list of active devices. |
85 | * @dev: Device to add to the list. | |
775b64d2 | 86 | */ |
3b98aeaf | 87 | void device_pm_add(struct device *dev) |
1da177e4 | 88 | { |
1da177e4 | 89 | pr_debug("PM: Adding info for %s:%s\n", |
c48ea603 DT |
90 | dev->bus ? dev->bus->name : "No Bus", |
91 | kobject_name(&dev->kobj)); | |
11048dcf | 92 | mutex_lock(&dpm_list_mtx); |
1eede070 | 93 | if (dev->parent) { |
f5a6d958 RW |
94 | if (dev->parent->power.status >= DPM_SUSPENDING) |
95 | dev_warn(dev, "parent %s should not be sleeping\n", | |
1e0b2cf9 | 96 | dev_name(dev->parent)); |
1eede070 RW |
97 | } else if (transition_started) { |
98 | /* | |
99 | * We refuse to register parentless devices while a PM | |
100 | * transition is in progress in order to avoid leaving them | |
101 | * unhandled down the road | |
102 | */ | |
728f0893 | 103 | dev_WARN(dev, "Parentless device registered during a PM transaction\n"); |
58aca232 | 104 | } |
3b98aeaf AS |
105 | |
106 | list_add_tail(&dev->power.entry, &dpm_list); | |
11048dcf | 107 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
108 | } |
109 | ||
775b64d2 | 110 | /** |
20d652d7 RW |
111 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
112 | * @dev: Device to be removed from the list. | |
775b64d2 | 113 | */ |
9cddad77 | 114 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
115 | { |
116 | pr_debug("PM: Removing info for %s:%s\n", | |
c48ea603 DT |
117 | dev->bus ? dev->bus->name : "No Bus", |
118 | kobject_name(&dev->kobj)); | |
5af84b82 | 119 | complete_all(&dev->power.completion); |
11048dcf | 120 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 121 | list_del_init(&dev->power.entry); |
11048dcf | 122 | mutex_unlock(&dpm_list_mtx); |
5e928f77 | 123 | pm_runtime_remove(dev); |
775b64d2 RW |
124 | } |
125 | ||
ffa6a705 | 126 | /** |
20d652d7 RW |
127 | * device_pm_move_before - Move device in the PM core's list of active devices. |
128 | * @deva: Device to move in dpm_list. | |
129 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
130 | */ |
131 | void device_pm_move_before(struct device *deva, struct device *devb) | |
132 | { | |
133 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
134 | deva->bus ? deva->bus->name : "No Bus", | |
135 | kobject_name(&deva->kobj), | |
136 | devb->bus ? devb->bus->name : "No Bus", | |
137 | kobject_name(&devb->kobj)); | |
138 | /* Delete deva from dpm_list and reinsert before devb. */ | |
139 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
140 | } | |
141 | ||
142 | /** | |
20d652d7 RW |
143 | * device_pm_move_after - Move device in the PM core's list of active devices. |
144 | * @deva: Device to move in dpm_list. | |
145 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
146 | */ |
147 | void device_pm_move_after(struct device *deva, struct device *devb) | |
148 | { | |
149 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
150 | deva->bus ? deva->bus->name : "No Bus", | |
151 | kobject_name(&deva->kobj), | |
152 | devb->bus ? devb->bus->name : "No Bus", | |
153 | kobject_name(&devb->kobj)); | |
154 | /* Delete deva from dpm_list and reinsert after devb. */ | |
155 | list_move(&deva->power.entry, &devb->power.entry); | |
156 | } | |
157 | ||
158 | /** | |
20d652d7 RW |
159 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
160 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
161 | */ |
162 | void device_pm_move_last(struct device *dev) | |
163 | { | |
164 | pr_debug("PM: Moving %s:%s to end of list\n", | |
165 | dev->bus ? dev->bus->name : "No Bus", | |
166 | kobject_name(&dev->kobj)); | |
167 | list_move_tail(&dev->power.entry, &dpm_list); | |
168 | } | |
169 | ||
875ab0b7 RW |
170 | static ktime_t initcall_debug_start(struct device *dev) |
171 | { | |
172 | ktime_t calltime = ktime_set(0, 0); | |
173 | ||
174 | if (initcall_debug) { | |
175 | pr_info("calling %s+ @ %i\n", | |
176 | dev_name(dev), task_pid_nr(current)); | |
177 | calltime = ktime_get(); | |
178 | } | |
179 | ||
180 | return calltime; | |
181 | } | |
182 | ||
183 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
184 | int error) | |
185 | { | |
186 | ktime_t delta, rettime; | |
187 | ||
188 | if (initcall_debug) { | |
189 | rettime = ktime_get(); | |
190 | delta = ktime_sub(rettime, calltime); | |
191 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), | |
192 | error, (unsigned long long)ktime_to_ns(delta) >> 10); | |
193 | } | |
194 | } | |
195 | ||
5af84b82 RW |
196 | /** |
197 | * dpm_wait - Wait for a PM operation to complete. | |
198 | * @dev: Device to wait for. | |
199 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
200 | */ | |
201 | static void dpm_wait(struct device *dev, bool async) | |
202 | { | |
203 | if (!dev) | |
204 | return; | |
205 | ||
0e06b4a8 | 206 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
207 | wait_for_completion(&dev->power.completion); |
208 | } | |
209 | ||
210 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
211 | { | |
212 | dpm_wait(dev, *((bool *)async_ptr)); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static void dpm_wait_for_children(struct device *dev, bool async) | |
217 | { | |
218 | device_for_each_child(dev, &async, dpm_wait_fn); | |
219 | } | |
220 | ||
1eede070 | 221 | /** |
20d652d7 RW |
222 | * pm_op - Execute the PM operation appropriate for given PM event. |
223 | * @dev: Device to handle. | |
224 | * @ops: PM operations to choose from. | |
225 | * @state: PM transition of the system being carried out. | |
1eede070 | 226 | */ |
d9ab7716 DT |
227 | static int pm_op(struct device *dev, |
228 | const struct dev_pm_ops *ops, | |
229 | pm_message_t state) | |
1eede070 RW |
230 | { |
231 | int error = 0; | |
875ab0b7 | 232 | ktime_t calltime; |
f2511774 | 233 | |
875ab0b7 | 234 | calltime = initcall_debug_start(dev); |
1eede070 RW |
235 | |
236 | switch (state.event) { | |
237 | #ifdef CONFIG_SUSPEND | |
238 | case PM_EVENT_SUSPEND: | |
239 | if (ops->suspend) { | |
240 | error = ops->suspend(dev); | |
241 | suspend_report_result(ops->suspend, error); | |
242 | } | |
243 | break; | |
244 | case PM_EVENT_RESUME: | |
245 | if (ops->resume) { | |
246 | error = ops->resume(dev); | |
247 | suspend_report_result(ops->resume, error); | |
248 | } | |
249 | break; | |
250 | #endif /* CONFIG_SUSPEND */ | |
251 | #ifdef CONFIG_HIBERNATION | |
252 | case PM_EVENT_FREEZE: | |
253 | case PM_EVENT_QUIESCE: | |
254 | if (ops->freeze) { | |
255 | error = ops->freeze(dev); | |
256 | suspend_report_result(ops->freeze, error); | |
257 | } | |
258 | break; | |
259 | case PM_EVENT_HIBERNATE: | |
260 | if (ops->poweroff) { | |
261 | error = ops->poweroff(dev); | |
262 | suspend_report_result(ops->poweroff, error); | |
263 | } | |
264 | break; | |
265 | case PM_EVENT_THAW: | |
266 | case PM_EVENT_RECOVER: | |
267 | if (ops->thaw) { | |
268 | error = ops->thaw(dev); | |
269 | suspend_report_result(ops->thaw, error); | |
270 | } | |
271 | break; | |
272 | case PM_EVENT_RESTORE: | |
273 | if (ops->restore) { | |
274 | error = ops->restore(dev); | |
275 | suspend_report_result(ops->restore, error); | |
276 | } | |
277 | break; | |
278 | #endif /* CONFIG_HIBERNATION */ | |
279 | default: | |
280 | error = -EINVAL; | |
281 | } | |
f2511774 | 282 | |
875ab0b7 | 283 | initcall_debug_report(dev, calltime, error); |
f2511774 | 284 | |
1eede070 RW |
285 | return error; |
286 | } | |
287 | ||
288 | /** | |
20d652d7 RW |
289 | * pm_noirq_op - Execute the PM operation appropriate for given PM event. |
290 | * @dev: Device to handle. | |
291 | * @ops: PM operations to choose from. | |
292 | * @state: PM transition of the system being carried out. | |
1eede070 | 293 | * |
20d652d7 RW |
294 | * The driver of @dev will not receive interrupts while this function is being |
295 | * executed. | |
1eede070 | 296 | */ |
d9ab7716 DT |
297 | static int pm_noirq_op(struct device *dev, |
298 | const struct dev_pm_ops *ops, | |
1eede070 RW |
299 | pm_message_t state) |
300 | { | |
301 | int error = 0; | |
f2511774 AV |
302 | ktime_t calltime, delta, rettime; |
303 | ||
304 | if (initcall_debug) { | |
8cc6b39f RW |
305 | pr_info("calling %s+ @ %i, parent: %s\n", |
306 | dev_name(dev), task_pid_nr(current), | |
307 | dev->parent ? dev_name(dev->parent) : "none"); | |
f2511774 AV |
308 | calltime = ktime_get(); |
309 | } | |
1eede070 RW |
310 | |
311 | switch (state.event) { | |
312 | #ifdef CONFIG_SUSPEND | |
313 | case PM_EVENT_SUSPEND: | |
314 | if (ops->suspend_noirq) { | |
315 | error = ops->suspend_noirq(dev); | |
316 | suspend_report_result(ops->suspend_noirq, error); | |
317 | } | |
318 | break; | |
319 | case PM_EVENT_RESUME: | |
320 | if (ops->resume_noirq) { | |
321 | error = ops->resume_noirq(dev); | |
322 | suspend_report_result(ops->resume_noirq, error); | |
323 | } | |
324 | break; | |
325 | #endif /* CONFIG_SUSPEND */ | |
326 | #ifdef CONFIG_HIBERNATION | |
327 | case PM_EVENT_FREEZE: | |
328 | case PM_EVENT_QUIESCE: | |
329 | if (ops->freeze_noirq) { | |
330 | error = ops->freeze_noirq(dev); | |
331 | suspend_report_result(ops->freeze_noirq, error); | |
332 | } | |
333 | break; | |
334 | case PM_EVENT_HIBERNATE: | |
335 | if (ops->poweroff_noirq) { | |
336 | error = ops->poweroff_noirq(dev); | |
337 | suspend_report_result(ops->poweroff_noirq, error); | |
338 | } | |
339 | break; | |
340 | case PM_EVENT_THAW: | |
341 | case PM_EVENT_RECOVER: | |
342 | if (ops->thaw_noirq) { | |
343 | error = ops->thaw_noirq(dev); | |
344 | suspend_report_result(ops->thaw_noirq, error); | |
345 | } | |
346 | break; | |
347 | case PM_EVENT_RESTORE: | |
348 | if (ops->restore_noirq) { | |
349 | error = ops->restore_noirq(dev); | |
350 | suspend_report_result(ops->restore_noirq, error); | |
351 | } | |
352 | break; | |
353 | #endif /* CONFIG_HIBERNATION */ | |
354 | default: | |
355 | error = -EINVAL; | |
356 | } | |
f2511774 AV |
357 | |
358 | if (initcall_debug) { | |
359 | rettime = ktime_get(); | |
360 | delta = ktime_sub(rettime, calltime); | |
875ab0b7 RW |
361 | printk("initcall %s_i+ returned %d after %Ld usecs\n", |
362 | dev_name(dev), error, | |
363 | (unsigned long long)ktime_to_ns(delta) >> 10); | |
f2511774 AV |
364 | } |
365 | ||
1eede070 RW |
366 | return error; |
367 | } | |
368 | ||
369 | static char *pm_verb(int event) | |
370 | { | |
371 | switch (event) { | |
372 | case PM_EVENT_SUSPEND: | |
373 | return "suspend"; | |
374 | case PM_EVENT_RESUME: | |
375 | return "resume"; | |
376 | case PM_EVENT_FREEZE: | |
377 | return "freeze"; | |
378 | case PM_EVENT_QUIESCE: | |
379 | return "quiesce"; | |
380 | case PM_EVENT_HIBERNATE: | |
381 | return "hibernate"; | |
382 | case PM_EVENT_THAW: | |
383 | return "thaw"; | |
384 | case PM_EVENT_RESTORE: | |
385 | return "restore"; | |
386 | case PM_EVENT_RECOVER: | |
387 | return "recover"; | |
388 | default: | |
389 | return "(unknown PM event)"; | |
390 | } | |
391 | } | |
392 | ||
393 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) | |
394 | { | |
395 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
396 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
397 | ", may wakeup" : ""); | |
398 | } | |
399 | ||
400 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
401 | int error) | |
402 | { | |
403 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
404 | kobject_name(&dev->kobj), pm_verb(state.event), info, error); | |
405 | } | |
406 | ||
ecf762b2 RW |
407 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
408 | { | |
409 | ktime_t calltime; | |
410 | s64 usecs64; | |
411 | int usecs; | |
412 | ||
413 | calltime = ktime_get(); | |
414 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
415 | do_div(usecs64, NSEC_PER_USEC); | |
416 | usecs = usecs64; | |
417 | if (usecs == 0) | |
418 | usecs = 1; | |
419 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
420 | info ?: "", info ? " " : "", pm_verb(state.event), | |
421 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
422 | } | |
423 | ||
cd59abfc AS |
424 | /*------------------------- Resume routines -------------------------*/ |
425 | ||
426 | /** | |
20d652d7 RW |
427 | * device_resume_noirq - Execute an "early resume" callback for given device. |
428 | * @dev: Device to handle. | |
429 | * @state: PM transition of the system being carried out. | |
cd59abfc | 430 | * |
20d652d7 RW |
431 | * The driver of @dev will not receive interrupts while this function is being |
432 | * executed. | |
cd59abfc | 433 | */ |
d1616302 | 434 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
cd59abfc AS |
435 | { |
436 | int error = 0; | |
437 | ||
438 | TRACE_DEVICE(dev); | |
439 | TRACE_RESUME(0); | |
440 | ||
33c33740 | 441 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
442 | pm_dev_dbg(dev, state, "EARLY "); |
443 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
e7176a37 DB |
444 | if (error) |
445 | goto End; | |
775b64d2 | 446 | } |
33c33740 | 447 | |
e7176a37 DB |
448 | if (dev->type && dev->type->pm) { |
449 | pm_dev_dbg(dev, state, "EARLY type "); | |
450 | error = pm_noirq_op(dev, dev->type->pm, state); | |
451 | if (error) | |
452 | goto End; | |
453 | } | |
454 | ||
455 | if (dev->class && dev->class->pm) { | |
456 | pm_dev_dbg(dev, state, "EARLY class "); | |
457 | error = pm_noirq_op(dev, dev->class->pm, state); | |
458 | } | |
459 | ||
460 | End: | |
775b64d2 RW |
461 | TRACE_RESUME(error); |
462 | return error; | |
463 | } | |
464 | ||
465 | /** | |
20d652d7 RW |
466 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
467 | * @state: PM transition of the system being carried out. | |
775b64d2 | 468 | * |
20d652d7 RW |
469 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
470 | * enable device drivers to receive interrupts. | |
775b64d2 | 471 | */ |
d1616302 | 472 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 473 | { |
1eede070 | 474 | struct device *dev; |
ecf762b2 | 475 | ktime_t starttime = ktime_get(); |
775b64d2 | 476 | |
32bdfac5 | 477 | mutex_lock(&dpm_list_mtx); |
3eb132c9 | 478 | transition_started = false; |
1eede070 RW |
479 | list_for_each_entry(dev, &dpm_list, power.entry) |
480 | if (dev->power.status > DPM_OFF) { | |
481 | int error; | |
775b64d2 | 482 | |
1eede070 | 483 | dev->power.status = DPM_OFF; |
d1616302 | 484 | error = device_resume_noirq(dev, state); |
1eede070 RW |
485 | if (error) |
486 | pm_dev_err(dev, state, " early", error); | |
487 | } | |
32bdfac5 | 488 | mutex_unlock(&dpm_list_mtx); |
ecf762b2 | 489 | dpm_show_time(starttime, state, "early"); |
2ed8d2b3 | 490 | resume_device_irqs(); |
775b64d2 | 491 | } |
d1616302 | 492 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
775b64d2 | 493 | |
875ab0b7 RW |
494 | /** |
495 | * legacy_resume - Execute a legacy (bus or class) resume callback for device. | |
0a884223 RD |
496 | * @dev: Device to resume. |
497 | * @cb: Resume callback to execute. | |
875ab0b7 RW |
498 | */ |
499 | static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) | |
500 | { | |
501 | int error; | |
502 | ktime_t calltime; | |
503 | ||
504 | calltime = initcall_debug_start(dev); | |
505 | ||
506 | error = cb(dev); | |
507 | suspend_report_result(cb, error); | |
508 | ||
509 | initcall_debug_report(dev, calltime, error); | |
510 | ||
511 | return error; | |
512 | } | |
513 | ||
775b64d2 | 514 | /** |
97df8c12 | 515 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
516 | * @dev: Device to handle. |
517 | * @state: PM transition of the system being carried out. | |
5af84b82 | 518 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 519 | */ |
97df8c12 | 520 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 RW |
521 | { |
522 | int error = 0; | |
523 | ||
524 | TRACE_DEVICE(dev); | |
525 | TRACE_RESUME(0); | |
cd59abfc | 526 | |
5af84b82 | 527 | dpm_wait(dev->parent, async); |
8e9394ce | 528 | device_lock(dev); |
7a8d37a3 | 529 | |
97df8c12 RW |
530 | dev->power.status = DPM_RESUMING; |
531 | ||
1eede070 RW |
532 | if (dev->bus) { |
533 | if (dev->bus->pm) { | |
534 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 535 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
536 | } else if (dev->bus->resume) { |
537 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 538 | error = legacy_resume(dev, dev->bus->resume); |
1eede070 RW |
539 | } |
540 | if (error) | |
541 | goto End; | |
cd59abfc AS |
542 | } |
543 | ||
1eede070 RW |
544 | if (dev->type) { |
545 | if (dev->type->pm) { | |
546 | pm_dev_dbg(dev, state, "type "); | |
547 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
548 | } |
549 | if (error) | |
550 | goto End; | |
cd59abfc AS |
551 | } |
552 | ||
1eede070 RW |
553 | if (dev->class) { |
554 | if (dev->class->pm) { | |
555 | pm_dev_dbg(dev, state, "class "); | |
556 | error = pm_op(dev, dev->class->pm, state); | |
557 | } else if (dev->class->resume) { | |
558 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 559 | error = legacy_resume(dev, dev->class->resume); |
1eede070 | 560 | } |
cd59abfc | 561 | } |
1eede070 | 562 | End: |
8e9394ce | 563 | device_unlock(dev); |
5af84b82 | 564 | complete_all(&dev->power.completion); |
7a8d37a3 | 565 | |
cd59abfc AS |
566 | TRACE_RESUME(error); |
567 | return error; | |
568 | } | |
569 | ||
5af84b82 RW |
570 | static void async_resume(void *data, async_cookie_t cookie) |
571 | { | |
572 | struct device *dev = (struct device *)data; | |
573 | int error; | |
574 | ||
97df8c12 | 575 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
576 | if (error) |
577 | pm_dev_err(dev, pm_transition, " async", error); | |
578 | put_device(dev); | |
579 | } | |
580 | ||
97df8c12 | 581 | static bool is_async(struct device *dev) |
5af84b82 | 582 | { |
97df8c12 RW |
583 | return dev->power.async_suspend && pm_async_enabled |
584 | && !pm_trace_is_enabled(); | |
5af84b82 RW |
585 | } |
586 | ||
775b64d2 | 587 | /** |
20d652d7 RW |
588 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
589 | * @state: PM transition of the system being carried out. | |
775b64d2 | 590 | * |
20d652d7 RW |
591 | * Execute the appropriate "resume" callback for all devices whose status |
592 | * indicates that they are suspended. | |
1eede070 RW |
593 | */ |
594 | static void dpm_resume(pm_message_t state) | |
595 | { | |
596 | struct list_head list; | |
97df8c12 | 597 | struct device *dev; |
ecf762b2 | 598 | ktime_t starttime = ktime_get(); |
1eede070 RW |
599 | |
600 | INIT_LIST_HEAD(&list); | |
601 | mutex_lock(&dpm_list_mtx); | |
5af84b82 | 602 | pm_transition = state; |
1eede070 | 603 | |
97df8c12 RW |
604 | list_for_each_entry(dev, &dpm_list, power.entry) { |
605 | if (dev->power.status < DPM_OFF) | |
606 | continue; | |
607 | ||
608 | INIT_COMPLETION(dev->power.completion); | |
609 | if (is_async(dev)) { | |
610 | get_device(dev); | |
611 | async_schedule(async_resume, dev); | |
612 | } | |
613 | } | |
614 | ||
615 | while (!list_empty(&dpm_list)) { | |
616 | dev = to_device(dpm_list.next); | |
1eede070 | 617 | get_device(dev); |
97df8c12 | 618 | if (dev->power.status >= DPM_OFF && !is_async(dev)) { |
1eede070 RW |
619 | int error; |
620 | ||
1eede070 RW |
621 | mutex_unlock(&dpm_list_mtx); |
622 | ||
97df8c12 | 623 | error = device_resume(dev, state, false); |
1eede070 RW |
624 | |
625 | mutex_lock(&dpm_list_mtx); | |
626 | if (error) | |
627 | pm_dev_err(dev, state, "", error); | |
628 | } else if (dev->power.status == DPM_SUSPENDING) { | |
629 | /* Allow new children of the device to be registered */ | |
630 | dev->power.status = DPM_RESUMING; | |
631 | } | |
632 | if (!list_empty(&dev->power.entry)) | |
633 | list_move_tail(&dev->power.entry, &list); | |
634 | put_device(dev); | |
635 | } | |
636 | list_splice(&list, &dpm_list); | |
637 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 | 638 | async_synchronize_full(); |
ecf762b2 | 639 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
640 | } |
641 | ||
642 | /** | |
20d652d7 RW |
643 | * device_complete - Complete a PM transition for given device. |
644 | * @dev: Device to handle. | |
645 | * @state: PM transition of the system being carried out. | |
1eede070 | 646 | */ |
d1616302 | 647 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 648 | { |
8e9394ce | 649 | device_lock(dev); |
1eede070 RW |
650 | |
651 | if (dev->class && dev->class->pm && dev->class->pm->complete) { | |
652 | pm_dev_dbg(dev, state, "completing class "); | |
653 | dev->class->pm->complete(dev); | |
654 | } | |
655 | ||
656 | if (dev->type && dev->type->pm && dev->type->pm->complete) { | |
657 | pm_dev_dbg(dev, state, "completing type "); | |
658 | dev->type->pm->complete(dev); | |
659 | } | |
660 | ||
adf09493 | 661 | if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { |
1eede070 | 662 | pm_dev_dbg(dev, state, "completing "); |
adf09493 | 663 | dev->bus->pm->complete(dev); |
1eede070 RW |
664 | } |
665 | ||
8e9394ce | 666 | device_unlock(dev); |
1eede070 RW |
667 | } |
668 | ||
669 | /** | |
20d652d7 RW |
670 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
671 | * @state: PM transition of the system being carried out. | |
775b64d2 | 672 | * |
20d652d7 RW |
673 | * Execute the ->complete() callbacks for all devices whose PM status is not |
674 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 675 | */ |
1eede070 | 676 | static void dpm_complete(pm_message_t state) |
cd59abfc | 677 | { |
1eede070 RW |
678 | struct list_head list; |
679 | ||
680 | INIT_LIST_HEAD(&list); | |
cd59abfc | 681 | mutex_lock(&dpm_list_mtx); |
e528e876 | 682 | transition_started = false; |
1eede070 RW |
683 | while (!list_empty(&dpm_list)) { |
684 | struct device *dev = to_device(dpm_list.prev); | |
cd59abfc | 685 | |
1eede070 RW |
686 | get_device(dev); |
687 | if (dev->power.status > DPM_ON) { | |
688 | dev->power.status = DPM_ON; | |
689 | mutex_unlock(&dpm_list_mtx); | |
690 | ||
d1616302 | 691 | device_complete(dev, state); |
aa0baaef | 692 | pm_runtime_put_sync(dev); |
1eede070 RW |
693 | |
694 | mutex_lock(&dpm_list_mtx); | |
695 | } | |
696 | if (!list_empty(&dev->power.entry)) | |
697 | list_move(&dev->power.entry, &list); | |
698 | put_device(dev); | |
cd59abfc | 699 | } |
1eede070 | 700 | list_splice(&list, &dpm_list); |
cd59abfc AS |
701 | mutex_unlock(&dpm_list_mtx); |
702 | } | |
703 | ||
cd59abfc | 704 | /** |
20d652d7 RW |
705 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
706 | * @state: PM transition of the system being carried out. | |
cd59abfc | 707 | * |
20d652d7 RW |
708 | * Execute "resume" callbacks for all devices and complete the PM transition of |
709 | * the system. | |
cd59abfc | 710 | */ |
d1616302 | 711 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 712 | { |
775b64d2 | 713 | might_sleep(); |
1eede070 RW |
714 | dpm_resume(state); |
715 | dpm_complete(state); | |
cd59abfc | 716 | } |
d1616302 | 717 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
718 | |
719 | ||
720 | /*------------------------- Suspend routines -------------------------*/ | |
721 | ||
1eede070 | 722 | /** |
20d652d7 RW |
723 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
724 | * @sleep_state: PM message representing a sleep state. | |
725 | * | |
726 | * Return a PM message representing the resume event corresponding to given | |
727 | * sleep state. | |
1eede070 RW |
728 | */ |
729 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 730 | { |
1eede070 RW |
731 | switch (sleep_state.event) { |
732 | case PM_EVENT_SUSPEND: | |
733 | return PMSG_RESUME; | |
734 | case PM_EVENT_FREEZE: | |
735 | case PM_EVENT_QUIESCE: | |
736 | return PMSG_RECOVER; | |
737 | case PM_EVENT_HIBERNATE: | |
738 | return PMSG_RESTORE; | |
cd59abfc | 739 | } |
1eede070 | 740 | return PMSG_ON; |
cd59abfc AS |
741 | } |
742 | ||
743 | /** | |
20d652d7 RW |
744 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
745 | * @dev: Device to handle. | |
746 | * @state: PM transition of the system being carried out. | |
775b64d2 | 747 | * |
20d652d7 RW |
748 | * The driver of @dev will not receive interrupts while this function is being |
749 | * executed. | |
cd59abfc | 750 | */ |
d1616302 | 751 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 RW |
752 | { |
753 | int error = 0; | |
cd59abfc | 754 | |
e7176a37 DB |
755 | if (dev->class && dev->class->pm) { |
756 | pm_dev_dbg(dev, state, "LATE class "); | |
757 | error = pm_noirq_op(dev, dev->class->pm, state); | |
758 | if (error) | |
759 | goto End; | |
760 | } | |
761 | ||
762 | if (dev->type && dev->type->pm) { | |
763 | pm_dev_dbg(dev, state, "LATE type "); | |
764 | error = pm_noirq_op(dev, dev->type->pm, state); | |
765 | if (error) | |
766 | goto End; | |
767 | } | |
768 | ||
33c33740 | 769 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
770 | pm_dev_dbg(dev, state, "LATE "); |
771 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
775b64d2 | 772 | } |
e7176a37 DB |
773 | |
774 | End: | |
775b64d2 RW |
775 | return error; |
776 | } | |
777 | ||
778 | /** | |
20d652d7 RW |
779 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
780 | * @state: PM transition of the system being carried out. | |
775b64d2 | 781 | * |
20d652d7 RW |
782 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
783 | * handlers for all non-sysdev devices. | |
775b64d2 | 784 | */ |
d1616302 | 785 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 786 | { |
1eede070 | 787 | struct device *dev; |
ecf762b2 | 788 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
789 | int error = 0; |
790 | ||
2ed8d2b3 | 791 | suspend_device_irqs(); |
32bdfac5 | 792 | mutex_lock(&dpm_list_mtx); |
1eede070 | 793 | list_for_each_entry_reverse(dev, &dpm_list, power.entry) { |
d1616302 | 794 | error = device_suspend_noirq(dev, state); |
775b64d2 | 795 | if (error) { |
1eede070 | 796 | pm_dev_err(dev, state, " late", error); |
775b64d2 RW |
797 | break; |
798 | } | |
1eede070 | 799 | dev->power.status = DPM_OFF_IRQ; |
775b64d2 | 800 | } |
32bdfac5 | 801 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 802 | if (error) |
d1616302 | 803 | dpm_resume_noirq(resume_event(state)); |
ecf762b2 RW |
804 | else |
805 | dpm_show_time(starttime, state, "late"); | |
775b64d2 RW |
806 | return error; |
807 | } | |
d1616302 | 808 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
775b64d2 | 809 | |
875ab0b7 RW |
810 | /** |
811 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
812 | * @dev: Device to suspend. |
813 | * @state: PM transition of the system being carried out. | |
814 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
815 | */ |
816 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
817 | int (*cb)(struct device *dev, pm_message_t state)) | |
818 | { | |
819 | int error; | |
820 | ktime_t calltime; | |
821 | ||
822 | calltime = initcall_debug_start(dev); | |
823 | ||
824 | error = cb(dev, state); | |
825 | suspend_report_result(cb, error); | |
826 | ||
827 | initcall_debug_report(dev, calltime, error); | |
828 | ||
829 | return error; | |
830 | } | |
831 | ||
5af84b82 RW |
832 | static int async_error; |
833 | ||
775b64d2 | 834 | /** |
20d652d7 RW |
835 | * device_suspend - Execute "suspend" callbacks for given device. |
836 | * @dev: Device to handle. | |
837 | * @state: PM transition of the system being carried out. | |
5af84b82 | 838 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 839 | */ |
5af84b82 | 840 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc AS |
841 | { |
842 | int error = 0; | |
843 | ||
5af84b82 | 844 | dpm_wait_for_children(dev, async); |
8e9394ce | 845 | device_lock(dev); |
7a8d37a3 | 846 | |
5af84b82 RW |
847 | if (async_error) |
848 | goto End; | |
849 | ||
1eede070 RW |
850 | if (dev->class) { |
851 | if (dev->class->pm) { | |
852 | pm_dev_dbg(dev, state, "class "); | |
853 | error = pm_op(dev, dev->class->pm, state); | |
854 | } else if (dev->class->suspend) { | |
855 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 856 | error = legacy_suspend(dev, state, dev->class->suspend); |
1eede070 RW |
857 | } |
858 | if (error) | |
859 | goto End; | |
cd59abfc AS |
860 | } |
861 | ||
1eede070 RW |
862 | if (dev->type) { |
863 | if (dev->type->pm) { | |
864 | pm_dev_dbg(dev, state, "type "); | |
865 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
866 | } |
867 | if (error) | |
868 | goto End; | |
cd59abfc AS |
869 | } |
870 | ||
1eede070 RW |
871 | if (dev->bus) { |
872 | if (dev->bus->pm) { | |
873 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 874 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
875 | } else if (dev->bus->suspend) { |
876 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 877 | error = legacy_suspend(dev, state, dev->bus->suspend); |
1eede070 | 878 | } |
cd59abfc | 879 | } |
5af84b82 RW |
880 | |
881 | if (!error) | |
882 | dev->power.status = DPM_OFF; | |
883 | ||
1eede070 | 884 | End: |
8e9394ce | 885 | device_unlock(dev); |
5af84b82 | 886 | complete_all(&dev->power.completion); |
7a8d37a3 | 887 | |
cd59abfc AS |
888 | return error; |
889 | } | |
890 | ||
5af84b82 RW |
891 | static void async_suspend(void *data, async_cookie_t cookie) |
892 | { | |
893 | struct device *dev = (struct device *)data; | |
894 | int error; | |
895 | ||
896 | error = __device_suspend(dev, pm_transition, true); | |
897 | if (error) { | |
898 | pm_dev_err(dev, pm_transition, " async", error); | |
899 | async_error = error; | |
900 | } | |
901 | ||
902 | put_device(dev); | |
903 | } | |
904 | ||
905 | static int device_suspend(struct device *dev) | |
906 | { | |
907 | INIT_COMPLETION(dev->power.completion); | |
908 | ||
0e06b4a8 | 909 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
910 | get_device(dev); |
911 | async_schedule(async_suspend, dev); | |
912 | return 0; | |
913 | } | |
914 | ||
915 | return __device_suspend(dev, pm_transition, false); | |
916 | } | |
917 | ||
cd59abfc | 918 | /** |
20d652d7 RW |
919 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
920 | * @state: PM transition of the system being carried out. | |
cd59abfc | 921 | */ |
775b64d2 | 922 | static int dpm_suspend(pm_message_t state) |
cd59abfc | 923 | { |
1eede070 | 924 | struct list_head list; |
ecf762b2 | 925 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
926 | int error = 0; |
927 | ||
1eede070 | 928 | INIT_LIST_HEAD(&list); |
cd59abfc | 929 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
930 | pm_transition = state; |
931 | async_error = 0; | |
1eede070 RW |
932 | while (!list_empty(&dpm_list)) { |
933 | struct device *dev = to_device(dpm_list.prev); | |
58aca232 | 934 | |
1eede070 | 935 | get_device(dev); |
cd59abfc | 936 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 937 | |
5af84b82 | 938 | error = device_suspend(dev); |
1eede070 | 939 | |
1b3cbec1 | 940 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 941 | if (error) { |
1eede070 RW |
942 | pm_dev_err(dev, state, "", error); |
943 | put_device(dev); | |
775b64d2 RW |
944 | break; |
945 | } | |
7a8d37a3 | 946 | if (!list_empty(&dev->power.entry)) |
1eede070 RW |
947 | list_move(&dev->power.entry, &list); |
948 | put_device(dev); | |
5af84b82 RW |
949 | if (async_error) |
950 | break; | |
cd59abfc | 951 | } |
1eede070 | 952 | list_splice(&list, dpm_list.prev); |
cd59abfc | 953 | mutex_unlock(&dpm_list_mtx); |
5af84b82 RW |
954 | async_synchronize_full(); |
955 | if (!error) | |
956 | error = async_error; | |
ecf762b2 RW |
957 | if (!error) |
958 | dpm_show_time(starttime, state, NULL); | |
1eede070 RW |
959 | return error; |
960 | } | |
961 | ||
962 | /** | |
20d652d7 RW |
963 | * device_prepare - Prepare a device for system power transition. |
964 | * @dev: Device to handle. | |
965 | * @state: PM transition of the system being carried out. | |
966 | * | |
967 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
968 | * device may be registered after this function has returned. | |
1eede070 | 969 | */ |
d1616302 | 970 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 RW |
971 | { |
972 | int error = 0; | |
973 | ||
8e9394ce | 974 | device_lock(dev); |
1eede070 | 975 | |
adf09493 | 976 | if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { |
1eede070 | 977 | pm_dev_dbg(dev, state, "preparing "); |
adf09493 RW |
978 | error = dev->bus->pm->prepare(dev); |
979 | suspend_report_result(dev->bus->pm->prepare, error); | |
1eede070 RW |
980 | if (error) |
981 | goto End; | |
982 | } | |
983 | ||
984 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { | |
985 | pm_dev_dbg(dev, state, "preparing type "); | |
986 | error = dev->type->pm->prepare(dev); | |
987 | suspend_report_result(dev->type->pm->prepare, error); | |
988 | if (error) | |
989 | goto End; | |
990 | } | |
991 | ||
992 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { | |
993 | pm_dev_dbg(dev, state, "preparing class "); | |
994 | error = dev->class->pm->prepare(dev); | |
995 | suspend_report_result(dev->class->pm->prepare, error); | |
996 | } | |
997 | End: | |
8e9394ce | 998 | device_unlock(dev); |
1eede070 RW |
999 | |
1000 | return error; | |
1001 | } | |
cd59abfc | 1002 | |
1eede070 | 1003 | /** |
20d652d7 RW |
1004 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1005 | * @state: PM transition of the system being carried out. | |
1eede070 | 1006 | * |
20d652d7 | 1007 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 RW |
1008 | */ |
1009 | static int dpm_prepare(pm_message_t state) | |
1010 | { | |
1011 | struct list_head list; | |
1012 | int error = 0; | |
1013 | ||
1014 | INIT_LIST_HEAD(&list); | |
1015 | mutex_lock(&dpm_list_mtx); | |
1016 | transition_started = true; | |
1017 | while (!list_empty(&dpm_list)) { | |
1018 | struct device *dev = to_device(dpm_list.next); | |
1019 | ||
1020 | get_device(dev); | |
1021 | dev->power.status = DPM_PREPARING; | |
1022 | mutex_unlock(&dpm_list_mtx); | |
1023 | ||
5e928f77 RW |
1024 | pm_runtime_get_noresume(dev); |
1025 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) { | |
1026 | /* Wake-up requested during system sleep transition. */ | |
aa0baaef | 1027 | pm_runtime_put_sync(dev); |
5e928f77 RW |
1028 | error = -EBUSY; |
1029 | } else { | |
1030 | error = device_prepare(dev, state); | |
1031 | } | |
1eede070 RW |
1032 | |
1033 | mutex_lock(&dpm_list_mtx); | |
1034 | if (error) { | |
1035 | dev->power.status = DPM_ON; | |
1036 | if (error == -EAGAIN) { | |
1037 | put_device(dev); | |
886a7a33 | 1038 | error = 0; |
1eede070 RW |
1039 | continue; |
1040 | } | |
1041 | printk(KERN_ERR "PM: Failed to prepare device %s " | |
1042 | "for power transition: error %d\n", | |
1043 | kobject_name(&dev->kobj), error); | |
1044 | put_device(dev); | |
1045 | break; | |
1046 | } | |
1047 | dev->power.status = DPM_SUSPENDING; | |
1048 | if (!list_empty(&dev->power.entry)) | |
1049 | list_move_tail(&dev->power.entry, &list); | |
1050 | put_device(dev); | |
1051 | } | |
1052 | list_splice(&list, &dpm_list); | |
1053 | mutex_unlock(&dpm_list_mtx); | |
cd59abfc AS |
1054 | return error; |
1055 | } | |
1056 | ||
775b64d2 | 1057 | /** |
20d652d7 RW |
1058 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1059 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1060 | * |
20d652d7 RW |
1061 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1062 | * callbacks for them. | |
775b64d2 | 1063 | */ |
d1616302 | 1064 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1065 | { |
1066 | int error; | |
cd59abfc | 1067 | |
775b64d2 | 1068 | might_sleep(); |
1eede070 RW |
1069 | error = dpm_prepare(state); |
1070 | if (!error) | |
1071 | error = dpm_suspend(state); | |
cd59abfc | 1072 | return error; |
cd59abfc | 1073 | } |
d1616302 | 1074 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1075 | |
1076 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1077 | { | |
c80cfb04 BH |
1078 | if (ret) |
1079 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1080 | } |
1081 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1082 | |
1083 | /** | |
1084 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1085 | * @dev: Device to wait for. | |
1086 | * @subordinate: Device that needs to wait for @dev. | |
1087 | */ | |
1088 | void device_pm_wait_for_dev(struct device *subordinate, struct device *dev) | |
1089 | { | |
1090 | dpm_wait(dev, subordinate->power.async_suspend); | |
1091 | } | |
1092 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |