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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); |
074037ec RW |
63 | dev->power.wakeup = NULL; |
64 | spin_lock_init(&dev->power.lock); | |
5e928f77 RW |
65 | pm_runtime_init(dev); |
66 | } | |
67 | ||
1eede070 | 68 | /** |
20d652d7 | 69 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
70 | */ |
71 | void device_pm_lock(void) | |
72 | { | |
73 | mutex_lock(&dpm_list_mtx); | |
74 | } | |
75 | ||
76 | /** | |
20d652d7 | 77 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
78 | */ |
79 | void device_pm_unlock(void) | |
80 | { | |
81 | mutex_unlock(&dpm_list_mtx); | |
82 | } | |
075c1771 | 83 | |
775b64d2 | 84 | /** |
20d652d7 RW |
85 | * device_pm_add - Add a device to the PM core's list of active devices. |
86 | * @dev: Device to add to the list. | |
775b64d2 | 87 | */ |
3b98aeaf | 88 | void device_pm_add(struct device *dev) |
1da177e4 | 89 | { |
1da177e4 | 90 | pr_debug("PM: Adding info for %s:%s\n", |
c48ea603 DT |
91 | dev->bus ? dev->bus->name : "No Bus", |
92 | kobject_name(&dev->kobj)); | |
11048dcf | 93 | mutex_lock(&dpm_list_mtx); |
1eede070 | 94 | if (dev->parent) { |
f5a6d958 RW |
95 | if (dev->parent->power.status >= DPM_SUSPENDING) |
96 | dev_warn(dev, "parent %s should not be sleeping\n", | |
1e0b2cf9 | 97 | dev_name(dev->parent)); |
1eede070 RW |
98 | } else if (transition_started) { |
99 | /* | |
100 | * We refuse to register parentless devices while a PM | |
101 | * transition is in progress in order to avoid leaving them | |
102 | * unhandled down the road | |
103 | */ | |
728f0893 | 104 | dev_WARN(dev, "Parentless device registered during a PM transaction\n"); |
58aca232 | 105 | } |
3b98aeaf AS |
106 | |
107 | list_add_tail(&dev->power.entry, &dpm_list); | |
11048dcf | 108 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
109 | } |
110 | ||
775b64d2 | 111 | /** |
20d652d7 RW |
112 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
113 | * @dev: Device to be removed from the list. | |
775b64d2 | 114 | */ |
9cddad77 | 115 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
116 | { |
117 | pr_debug("PM: Removing info for %s:%s\n", | |
c48ea603 DT |
118 | dev->bus ? dev->bus->name : "No Bus", |
119 | kobject_name(&dev->kobj)); | |
5af84b82 | 120 | complete_all(&dev->power.completion); |
11048dcf | 121 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 122 | list_del_init(&dev->power.entry); |
11048dcf | 123 | mutex_unlock(&dpm_list_mtx); |
074037ec | 124 | device_wakeup_disable(dev); |
5e928f77 | 125 | pm_runtime_remove(dev); |
775b64d2 RW |
126 | } |
127 | ||
ffa6a705 | 128 | /** |
20d652d7 RW |
129 | * device_pm_move_before - Move device in the PM core's list of active devices. |
130 | * @deva: Device to move in dpm_list. | |
131 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
132 | */ |
133 | void device_pm_move_before(struct device *deva, struct device *devb) | |
134 | { | |
135 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
136 | deva->bus ? deva->bus->name : "No Bus", | |
137 | kobject_name(&deva->kobj), | |
138 | devb->bus ? devb->bus->name : "No Bus", | |
139 | kobject_name(&devb->kobj)); | |
140 | /* Delete deva from dpm_list and reinsert before devb. */ | |
141 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
142 | } | |
143 | ||
144 | /** | |
20d652d7 RW |
145 | * device_pm_move_after - Move device in the PM core's list of active devices. |
146 | * @deva: Device to move in dpm_list. | |
147 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
148 | */ |
149 | void device_pm_move_after(struct device *deva, struct device *devb) | |
150 | { | |
151 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
152 | deva->bus ? deva->bus->name : "No Bus", | |
153 | kobject_name(&deva->kobj), | |
154 | devb->bus ? devb->bus->name : "No Bus", | |
155 | kobject_name(&devb->kobj)); | |
156 | /* Delete deva from dpm_list and reinsert after devb. */ | |
157 | list_move(&deva->power.entry, &devb->power.entry); | |
158 | } | |
159 | ||
160 | /** | |
20d652d7 RW |
161 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
162 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
163 | */ |
164 | void device_pm_move_last(struct device *dev) | |
165 | { | |
166 | pr_debug("PM: Moving %s:%s to end of list\n", | |
167 | dev->bus ? dev->bus->name : "No Bus", | |
168 | kobject_name(&dev->kobj)); | |
169 | list_move_tail(&dev->power.entry, &dpm_list); | |
170 | } | |
171 | ||
875ab0b7 RW |
172 | static ktime_t initcall_debug_start(struct device *dev) |
173 | { | |
174 | ktime_t calltime = ktime_set(0, 0); | |
175 | ||
176 | if (initcall_debug) { | |
177 | pr_info("calling %s+ @ %i\n", | |
178 | dev_name(dev), task_pid_nr(current)); | |
179 | calltime = ktime_get(); | |
180 | } | |
181 | ||
182 | return calltime; | |
183 | } | |
184 | ||
185 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
186 | int error) | |
187 | { | |
188 | ktime_t delta, rettime; | |
189 | ||
190 | if (initcall_debug) { | |
191 | rettime = ktime_get(); | |
192 | delta = ktime_sub(rettime, calltime); | |
193 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), | |
194 | error, (unsigned long long)ktime_to_ns(delta) >> 10); | |
195 | } | |
196 | } | |
197 | ||
5af84b82 RW |
198 | /** |
199 | * dpm_wait - Wait for a PM operation to complete. | |
200 | * @dev: Device to wait for. | |
201 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
202 | */ | |
203 | static void dpm_wait(struct device *dev, bool async) | |
204 | { | |
205 | if (!dev) | |
206 | return; | |
207 | ||
0e06b4a8 | 208 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
209 | wait_for_completion(&dev->power.completion); |
210 | } | |
211 | ||
212 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
213 | { | |
214 | dpm_wait(dev, *((bool *)async_ptr)); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static void dpm_wait_for_children(struct device *dev, bool async) | |
219 | { | |
220 | device_for_each_child(dev, &async, dpm_wait_fn); | |
221 | } | |
222 | ||
1eede070 | 223 | /** |
20d652d7 RW |
224 | * pm_op - Execute the PM operation appropriate for given PM event. |
225 | * @dev: Device to handle. | |
226 | * @ops: PM operations to choose from. | |
227 | * @state: PM transition of the system being carried out. | |
1eede070 | 228 | */ |
d9ab7716 DT |
229 | static int pm_op(struct device *dev, |
230 | const struct dev_pm_ops *ops, | |
231 | pm_message_t state) | |
1eede070 RW |
232 | { |
233 | int error = 0; | |
875ab0b7 | 234 | ktime_t calltime; |
f2511774 | 235 | |
875ab0b7 | 236 | calltime = initcall_debug_start(dev); |
1eede070 RW |
237 | |
238 | switch (state.event) { | |
239 | #ifdef CONFIG_SUSPEND | |
240 | case PM_EVENT_SUSPEND: | |
241 | if (ops->suspend) { | |
242 | error = ops->suspend(dev); | |
243 | suspend_report_result(ops->suspend, error); | |
244 | } | |
245 | break; | |
246 | case PM_EVENT_RESUME: | |
247 | if (ops->resume) { | |
248 | error = ops->resume(dev); | |
249 | suspend_report_result(ops->resume, error); | |
250 | } | |
251 | break; | |
252 | #endif /* CONFIG_SUSPEND */ | |
253 | #ifdef CONFIG_HIBERNATION | |
254 | case PM_EVENT_FREEZE: | |
255 | case PM_EVENT_QUIESCE: | |
256 | if (ops->freeze) { | |
257 | error = ops->freeze(dev); | |
258 | suspend_report_result(ops->freeze, error); | |
259 | } | |
260 | break; | |
261 | case PM_EVENT_HIBERNATE: | |
262 | if (ops->poweroff) { | |
263 | error = ops->poweroff(dev); | |
264 | suspend_report_result(ops->poweroff, error); | |
265 | } | |
266 | break; | |
267 | case PM_EVENT_THAW: | |
268 | case PM_EVENT_RECOVER: | |
269 | if (ops->thaw) { | |
270 | error = ops->thaw(dev); | |
271 | suspend_report_result(ops->thaw, error); | |
272 | } | |
273 | break; | |
274 | case PM_EVENT_RESTORE: | |
275 | if (ops->restore) { | |
276 | error = ops->restore(dev); | |
277 | suspend_report_result(ops->restore, error); | |
278 | } | |
279 | break; | |
280 | #endif /* CONFIG_HIBERNATION */ | |
281 | default: | |
282 | error = -EINVAL; | |
283 | } | |
f2511774 | 284 | |
875ab0b7 | 285 | initcall_debug_report(dev, calltime, error); |
f2511774 | 286 | |
1eede070 RW |
287 | return error; |
288 | } | |
289 | ||
290 | /** | |
20d652d7 RW |
291 | * pm_noirq_op - Execute the PM operation appropriate for given PM event. |
292 | * @dev: Device to handle. | |
293 | * @ops: PM operations to choose from. | |
294 | * @state: PM transition of the system being carried out. | |
1eede070 | 295 | * |
20d652d7 RW |
296 | * The driver of @dev will not receive interrupts while this function is being |
297 | * executed. | |
1eede070 | 298 | */ |
d9ab7716 DT |
299 | static int pm_noirq_op(struct device *dev, |
300 | const struct dev_pm_ops *ops, | |
1eede070 RW |
301 | pm_message_t state) |
302 | { | |
303 | int error = 0; | |
f2511774 AV |
304 | ktime_t calltime, delta, rettime; |
305 | ||
306 | if (initcall_debug) { | |
8cc6b39f RW |
307 | pr_info("calling %s+ @ %i, parent: %s\n", |
308 | dev_name(dev), task_pid_nr(current), | |
309 | dev->parent ? dev_name(dev->parent) : "none"); | |
f2511774 AV |
310 | calltime = ktime_get(); |
311 | } | |
1eede070 RW |
312 | |
313 | switch (state.event) { | |
314 | #ifdef CONFIG_SUSPEND | |
315 | case PM_EVENT_SUSPEND: | |
316 | if (ops->suspend_noirq) { | |
317 | error = ops->suspend_noirq(dev); | |
318 | suspend_report_result(ops->suspend_noirq, error); | |
319 | } | |
320 | break; | |
321 | case PM_EVENT_RESUME: | |
322 | if (ops->resume_noirq) { | |
323 | error = ops->resume_noirq(dev); | |
324 | suspend_report_result(ops->resume_noirq, error); | |
325 | } | |
326 | break; | |
327 | #endif /* CONFIG_SUSPEND */ | |
328 | #ifdef CONFIG_HIBERNATION | |
329 | case PM_EVENT_FREEZE: | |
330 | case PM_EVENT_QUIESCE: | |
331 | if (ops->freeze_noirq) { | |
332 | error = ops->freeze_noirq(dev); | |
333 | suspend_report_result(ops->freeze_noirq, error); | |
334 | } | |
335 | break; | |
336 | case PM_EVENT_HIBERNATE: | |
337 | if (ops->poweroff_noirq) { | |
338 | error = ops->poweroff_noirq(dev); | |
339 | suspend_report_result(ops->poweroff_noirq, error); | |
340 | } | |
341 | break; | |
342 | case PM_EVENT_THAW: | |
343 | case PM_EVENT_RECOVER: | |
344 | if (ops->thaw_noirq) { | |
345 | error = ops->thaw_noirq(dev); | |
346 | suspend_report_result(ops->thaw_noirq, error); | |
347 | } | |
348 | break; | |
349 | case PM_EVENT_RESTORE: | |
350 | if (ops->restore_noirq) { | |
351 | error = ops->restore_noirq(dev); | |
352 | suspend_report_result(ops->restore_noirq, error); | |
353 | } | |
354 | break; | |
355 | #endif /* CONFIG_HIBERNATION */ | |
356 | default: | |
357 | error = -EINVAL; | |
358 | } | |
f2511774 AV |
359 | |
360 | if (initcall_debug) { | |
361 | rettime = ktime_get(); | |
362 | delta = ktime_sub(rettime, calltime); | |
875ab0b7 RW |
363 | printk("initcall %s_i+ returned %d after %Ld usecs\n", |
364 | dev_name(dev), error, | |
365 | (unsigned long long)ktime_to_ns(delta) >> 10); | |
f2511774 AV |
366 | } |
367 | ||
1eede070 RW |
368 | return error; |
369 | } | |
370 | ||
371 | static char *pm_verb(int event) | |
372 | { | |
373 | switch (event) { | |
374 | case PM_EVENT_SUSPEND: | |
375 | return "suspend"; | |
376 | case PM_EVENT_RESUME: | |
377 | return "resume"; | |
378 | case PM_EVENT_FREEZE: | |
379 | return "freeze"; | |
380 | case PM_EVENT_QUIESCE: | |
381 | return "quiesce"; | |
382 | case PM_EVENT_HIBERNATE: | |
383 | return "hibernate"; | |
384 | case PM_EVENT_THAW: | |
385 | return "thaw"; | |
386 | case PM_EVENT_RESTORE: | |
387 | return "restore"; | |
388 | case PM_EVENT_RECOVER: | |
389 | return "recover"; | |
390 | default: | |
391 | return "(unknown PM event)"; | |
392 | } | |
393 | } | |
394 | ||
395 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) | |
396 | { | |
397 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
398 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
399 | ", may wakeup" : ""); | |
400 | } | |
401 | ||
402 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
403 | int error) | |
404 | { | |
405 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
406 | kobject_name(&dev->kobj), pm_verb(state.event), info, error); | |
407 | } | |
408 | ||
ecf762b2 RW |
409 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
410 | { | |
411 | ktime_t calltime; | |
0702d9ee | 412 | u64 usecs64; |
ecf762b2 RW |
413 | int usecs; |
414 | ||
415 | calltime = ktime_get(); | |
416 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
417 | do_div(usecs64, NSEC_PER_USEC); | |
418 | usecs = usecs64; | |
419 | if (usecs == 0) | |
420 | usecs = 1; | |
421 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
422 | info ?: "", info ? " " : "", pm_verb(state.event), | |
423 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
424 | } | |
425 | ||
cd59abfc AS |
426 | /*------------------------- Resume routines -------------------------*/ |
427 | ||
428 | /** | |
20d652d7 RW |
429 | * device_resume_noirq - Execute an "early resume" callback for given device. |
430 | * @dev: Device to handle. | |
431 | * @state: PM transition of the system being carried out. | |
cd59abfc | 432 | * |
20d652d7 RW |
433 | * The driver of @dev will not receive interrupts while this function is being |
434 | * executed. | |
cd59abfc | 435 | */ |
d1616302 | 436 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
cd59abfc AS |
437 | { |
438 | int error = 0; | |
439 | ||
440 | TRACE_DEVICE(dev); | |
441 | TRACE_RESUME(0); | |
442 | ||
33c33740 | 443 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
444 | pm_dev_dbg(dev, state, "EARLY "); |
445 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
e7176a37 DB |
446 | if (error) |
447 | goto End; | |
775b64d2 | 448 | } |
33c33740 | 449 | |
e7176a37 DB |
450 | if (dev->type && dev->type->pm) { |
451 | pm_dev_dbg(dev, state, "EARLY type "); | |
452 | error = pm_noirq_op(dev, dev->type->pm, state); | |
453 | if (error) | |
454 | goto End; | |
455 | } | |
456 | ||
457 | if (dev->class && dev->class->pm) { | |
458 | pm_dev_dbg(dev, state, "EARLY class "); | |
459 | error = pm_noirq_op(dev, dev->class->pm, state); | |
460 | } | |
461 | ||
462 | End: | |
775b64d2 RW |
463 | TRACE_RESUME(error); |
464 | return error; | |
465 | } | |
466 | ||
467 | /** | |
20d652d7 RW |
468 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
469 | * @state: PM transition of the system being carried out. | |
775b64d2 | 470 | * |
20d652d7 RW |
471 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
472 | * enable device drivers to receive interrupts. | |
775b64d2 | 473 | */ |
d1616302 | 474 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 475 | { |
1eede070 | 476 | struct device *dev; |
ecf762b2 | 477 | ktime_t starttime = ktime_get(); |
775b64d2 | 478 | |
32bdfac5 | 479 | mutex_lock(&dpm_list_mtx); |
3eb132c9 | 480 | transition_started = false; |
1eede070 RW |
481 | list_for_each_entry(dev, &dpm_list, power.entry) |
482 | if (dev->power.status > DPM_OFF) { | |
483 | int error; | |
775b64d2 | 484 | |
1eede070 | 485 | dev->power.status = DPM_OFF; |
d1616302 | 486 | error = device_resume_noirq(dev, state); |
1eede070 RW |
487 | if (error) |
488 | pm_dev_err(dev, state, " early", error); | |
489 | } | |
32bdfac5 | 490 | mutex_unlock(&dpm_list_mtx); |
ecf762b2 | 491 | dpm_show_time(starttime, state, "early"); |
2ed8d2b3 | 492 | resume_device_irqs(); |
775b64d2 | 493 | } |
d1616302 | 494 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
775b64d2 | 495 | |
875ab0b7 RW |
496 | /** |
497 | * legacy_resume - Execute a legacy (bus or class) resume callback for device. | |
0a884223 RD |
498 | * @dev: Device to resume. |
499 | * @cb: Resume callback to execute. | |
875ab0b7 RW |
500 | */ |
501 | static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) | |
502 | { | |
503 | int error; | |
504 | ktime_t calltime; | |
505 | ||
506 | calltime = initcall_debug_start(dev); | |
507 | ||
508 | error = cb(dev); | |
509 | suspend_report_result(cb, error); | |
510 | ||
511 | initcall_debug_report(dev, calltime, error); | |
512 | ||
513 | return error; | |
514 | } | |
515 | ||
775b64d2 | 516 | /** |
97df8c12 | 517 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
518 | * @dev: Device to handle. |
519 | * @state: PM transition of the system being carried out. | |
5af84b82 | 520 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 521 | */ |
97df8c12 | 522 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 RW |
523 | { |
524 | int error = 0; | |
525 | ||
526 | TRACE_DEVICE(dev); | |
527 | TRACE_RESUME(0); | |
cd59abfc | 528 | |
5af84b82 | 529 | dpm_wait(dev->parent, async); |
8e9394ce | 530 | device_lock(dev); |
7a8d37a3 | 531 | |
97df8c12 RW |
532 | dev->power.status = DPM_RESUMING; |
533 | ||
1eede070 RW |
534 | if (dev->bus) { |
535 | if (dev->bus->pm) { | |
536 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 537 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
538 | } else if (dev->bus->resume) { |
539 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 540 | error = legacy_resume(dev, dev->bus->resume); |
1eede070 RW |
541 | } |
542 | if (error) | |
543 | goto End; | |
cd59abfc AS |
544 | } |
545 | ||
1eede070 RW |
546 | if (dev->type) { |
547 | if (dev->type->pm) { | |
548 | pm_dev_dbg(dev, state, "type "); | |
549 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
550 | } |
551 | if (error) | |
552 | goto End; | |
cd59abfc AS |
553 | } |
554 | ||
1eede070 RW |
555 | if (dev->class) { |
556 | if (dev->class->pm) { | |
557 | pm_dev_dbg(dev, state, "class "); | |
558 | error = pm_op(dev, dev->class->pm, state); | |
559 | } else if (dev->class->resume) { | |
560 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 561 | error = legacy_resume(dev, dev->class->resume); |
1eede070 | 562 | } |
cd59abfc | 563 | } |
1eede070 | 564 | End: |
8e9394ce | 565 | device_unlock(dev); |
5af84b82 | 566 | complete_all(&dev->power.completion); |
7a8d37a3 | 567 | |
cd59abfc AS |
568 | TRACE_RESUME(error); |
569 | return error; | |
570 | } | |
571 | ||
5af84b82 RW |
572 | static void async_resume(void *data, async_cookie_t cookie) |
573 | { | |
574 | struct device *dev = (struct device *)data; | |
575 | int error; | |
576 | ||
97df8c12 | 577 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
578 | if (error) |
579 | pm_dev_err(dev, pm_transition, " async", error); | |
580 | put_device(dev); | |
581 | } | |
582 | ||
97df8c12 | 583 | static bool is_async(struct device *dev) |
5af84b82 | 584 | { |
97df8c12 RW |
585 | return dev->power.async_suspend && pm_async_enabled |
586 | && !pm_trace_is_enabled(); | |
5af84b82 RW |
587 | } |
588 | ||
775b64d2 | 589 | /** |
20d652d7 RW |
590 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
591 | * @state: PM transition of the system being carried out. | |
775b64d2 | 592 | * |
20d652d7 RW |
593 | * Execute the appropriate "resume" callback for all devices whose status |
594 | * indicates that they are suspended. | |
1eede070 RW |
595 | */ |
596 | static void dpm_resume(pm_message_t state) | |
597 | { | |
598 | struct list_head list; | |
97df8c12 | 599 | struct device *dev; |
ecf762b2 | 600 | ktime_t starttime = ktime_get(); |
1eede070 RW |
601 | |
602 | INIT_LIST_HEAD(&list); | |
603 | mutex_lock(&dpm_list_mtx); | |
5af84b82 | 604 | pm_transition = state; |
1eede070 | 605 | |
97df8c12 RW |
606 | list_for_each_entry(dev, &dpm_list, power.entry) { |
607 | if (dev->power.status < DPM_OFF) | |
608 | continue; | |
609 | ||
610 | INIT_COMPLETION(dev->power.completion); | |
611 | if (is_async(dev)) { | |
612 | get_device(dev); | |
613 | async_schedule(async_resume, dev); | |
614 | } | |
615 | } | |
616 | ||
617 | while (!list_empty(&dpm_list)) { | |
618 | dev = to_device(dpm_list.next); | |
1eede070 | 619 | get_device(dev); |
97df8c12 | 620 | if (dev->power.status >= DPM_OFF && !is_async(dev)) { |
1eede070 RW |
621 | int error; |
622 | ||
1eede070 RW |
623 | mutex_unlock(&dpm_list_mtx); |
624 | ||
97df8c12 | 625 | error = device_resume(dev, state, false); |
1eede070 RW |
626 | |
627 | mutex_lock(&dpm_list_mtx); | |
628 | if (error) | |
629 | pm_dev_err(dev, state, "", error); | |
630 | } else if (dev->power.status == DPM_SUSPENDING) { | |
631 | /* Allow new children of the device to be registered */ | |
632 | dev->power.status = DPM_RESUMING; | |
633 | } | |
634 | if (!list_empty(&dev->power.entry)) | |
635 | list_move_tail(&dev->power.entry, &list); | |
636 | put_device(dev); | |
637 | } | |
638 | list_splice(&list, &dpm_list); | |
639 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 | 640 | async_synchronize_full(); |
ecf762b2 | 641 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
642 | } |
643 | ||
644 | /** | |
20d652d7 RW |
645 | * device_complete - Complete a PM transition for given device. |
646 | * @dev: Device to handle. | |
647 | * @state: PM transition of the system being carried out. | |
1eede070 | 648 | */ |
d1616302 | 649 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 650 | { |
8e9394ce | 651 | device_lock(dev); |
1eede070 RW |
652 | |
653 | if (dev->class && dev->class->pm && dev->class->pm->complete) { | |
654 | pm_dev_dbg(dev, state, "completing class "); | |
655 | dev->class->pm->complete(dev); | |
656 | } | |
657 | ||
658 | if (dev->type && dev->type->pm && dev->type->pm->complete) { | |
659 | pm_dev_dbg(dev, state, "completing type "); | |
660 | dev->type->pm->complete(dev); | |
661 | } | |
662 | ||
adf09493 | 663 | if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { |
1eede070 | 664 | pm_dev_dbg(dev, state, "completing "); |
adf09493 | 665 | dev->bus->pm->complete(dev); |
1eede070 RW |
666 | } |
667 | ||
8e9394ce | 668 | device_unlock(dev); |
1eede070 RW |
669 | } |
670 | ||
671 | /** | |
20d652d7 RW |
672 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
673 | * @state: PM transition of the system being carried out. | |
775b64d2 | 674 | * |
20d652d7 RW |
675 | * Execute the ->complete() callbacks for all devices whose PM status is not |
676 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 677 | */ |
1eede070 | 678 | static void dpm_complete(pm_message_t state) |
cd59abfc | 679 | { |
1eede070 RW |
680 | struct list_head list; |
681 | ||
682 | INIT_LIST_HEAD(&list); | |
cd59abfc | 683 | mutex_lock(&dpm_list_mtx); |
e528e876 | 684 | transition_started = false; |
1eede070 RW |
685 | while (!list_empty(&dpm_list)) { |
686 | struct device *dev = to_device(dpm_list.prev); | |
cd59abfc | 687 | |
1eede070 RW |
688 | get_device(dev); |
689 | if (dev->power.status > DPM_ON) { | |
690 | dev->power.status = DPM_ON; | |
691 | mutex_unlock(&dpm_list_mtx); | |
692 | ||
d1616302 | 693 | device_complete(dev, state); |
aa0baaef | 694 | pm_runtime_put_sync(dev); |
1eede070 RW |
695 | |
696 | mutex_lock(&dpm_list_mtx); | |
697 | } | |
698 | if (!list_empty(&dev->power.entry)) | |
699 | list_move(&dev->power.entry, &list); | |
700 | put_device(dev); | |
cd59abfc | 701 | } |
1eede070 | 702 | list_splice(&list, &dpm_list); |
cd59abfc AS |
703 | mutex_unlock(&dpm_list_mtx); |
704 | } | |
705 | ||
cd59abfc | 706 | /** |
20d652d7 RW |
707 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
708 | * @state: PM transition of the system being carried out. | |
cd59abfc | 709 | * |
20d652d7 RW |
710 | * Execute "resume" callbacks for all devices and complete the PM transition of |
711 | * the system. | |
cd59abfc | 712 | */ |
d1616302 | 713 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 714 | { |
775b64d2 | 715 | might_sleep(); |
1eede070 RW |
716 | dpm_resume(state); |
717 | dpm_complete(state); | |
cd59abfc | 718 | } |
d1616302 | 719 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
720 | |
721 | ||
722 | /*------------------------- Suspend routines -------------------------*/ | |
723 | ||
1eede070 | 724 | /** |
20d652d7 RW |
725 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
726 | * @sleep_state: PM message representing a sleep state. | |
727 | * | |
728 | * Return a PM message representing the resume event corresponding to given | |
729 | * sleep state. | |
1eede070 RW |
730 | */ |
731 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 732 | { |
1eede070 RW |
733 | switch (sleep_state.event) { |
734 | case PM_EVENT_SUSPEND: | |
735 | return PMSG_RESUME; | |
736 | case PM_EVENT_FREEZE: | |
737 | case PM_EVENT_QUIESCE: | |
738 | return PMSG_RECOVER; | |
739 | case PM_EVENT_HIBERNATE: | |
740 | return PMSG_RESTORE; | |
cd59abfc | 741 | } |
1eede070 | 742 | return PMSG_ON; |
cd59abfc AS |
743 | } |
744 | ||
745 | /** | |
20d652d7 RW |
746 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
747 | * @dev: Device to handle. | |
748 | * @state: PM transition of the system being carried out. | |
775b64d2 | 749 | * |
20d652d7 RW |
750 | * The driver of @dev will not receive interrupts while this function is being |
751 | * executed. | |
cd59abfc | 752 | */ |
d1616302 | 753 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 RW |
754 | { |
755 | int error = 0; | |
cd59abfc | 756 | |
e7176a37 DB |
757 | if (dev->class && dev->class->pm) { |
758 | pm_dev_dbg(dev, state, "LATE class "); | |
759 | error = pm_noirq_op(dev, dev->class->pm, state); | |
760 | if (error) | |
761 | goto End; | |
762 | } | |
763 | ||
764 | if (dev->type && dev->type->pm) { | |
765 | pm_dev_dbg(dev, state, "LATE type "); | |
766 | error = pm_noirq_op(dev, dev->type->pm, state); | |
767 | if (error) | |
768 | goto End; | |
769 | } | |
770 | ||
33c33740 | 771 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
772 | pm_dev_dbg(dev, state, "LATE "); |
773 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
775b64d2 | 774 | } |
e7176a37 DB |
775 | |
776 | End: | |
775b64d2 RW |
777 | return error; |
778 | } | |
779 | ||
780 | /** | |
20d652d7 RW |
781 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
782 | * @state: PM transition of the system being carried out. | |
775b64d2 | 783 | * |
20d652d7 RW |
784 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
785 | * handlers for all non-sysdev devices. | |
775b64d2 | 786 | */ |
d1616302 | 787 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 788 | { |
1eede070 | 789 | struct device *dev; |
ecf762b2 | 790 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
791 | int error = 0; |
792 | ||
2ed8d2b3 | 793 | suspend_device_irqs(); |
32bdfac5 | 794 | mutex_lock(&dpm_list_mtx); |
1eede070 | 795 | list_for_each_entry_reverse(dev, &dpm_list, power.entry) { |
d1616302 | 796 | error = device_suspend_noirq(dev, state); |
775b64d2 | 797 | if (error) { |
1eede070 | 798 | pm_dev_err(dev, state, " late", error); |
775b64d2 RW |
799 | break; |
800 | } | |
1eede070 | 801 | dev->power.status = DPM_OFF_IRQ; |
775b64d2 | 802 | } |
32bdfac5 | 803 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 804 | if (error) |
d1616302 | 805 | dpm_resume_noirq(resume_event(state)); |
ecf762b2 RW |
806 | else |
807 | dpm_show_time(starttime, state, "late"); | |
775b64d2 RW |
808 | return error; |
809 | } | |
d1616302 | 810 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
775b64d2 | 811 | |
875ab0b7 RW |
812 | /** |
813 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
814 | * @dev: Device to suspend. |
815 | * @state: PM transition of the system being carried out. | |
816 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
817 | */ |
818 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
819 | int (*cb)(struct device *dev, pm_message_t state)) | |
820 | { | |
821 | int error; | |
822 | ktime_t calltime; | |
823 | ||
824 | calltime = initcall_debug_start(dev); | |
825 | ||
826 | error = cb(dev, state); | |
827 | suspend_report_result(cb, error); | |
828 | ||
829 | initcall_debug_report(dev, calltime, error); | |
830 | ||
831 | return error; | |
832 | } | |
833 | ||
5af84b82 RW |
834 | static int async_error; |
835 | ||
775b64d2 | 836 | /** |
20d652d7 RW |
837 | * device_suspend - Execute "suspend" callbacks for given device. |
838 | * @dev: Device to handle. | |
839 | * @state: PM transition of the system being carried out. | |
5af84b82 | 840 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 841 | */ |
5af84b82 | 842 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc AS |
843 | { |
844 | int error = 0; | |
845 | ||
5af84b82 | 846 | dpm_wait_for_children(dev, async); |
8e9394ce | 847 | device_lock(dev); |
7a8d37a3 | 848 | |
5af84b82 RW |
849 | if (async_error) |
850 | goto End; | |
851 | ||
1eede070 RW |
852 | if (dev->class) { |
853 | if (dev->class->pm) { | |
854 | pm_dev_dbg(dev, state, "class "); | |
855 | error = pm_op(dev, dev->class->pm, state); | |
856 | } else if (dev->class->suspend) { | |
857 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 858 | error = legacy_suspend(dev, state, dev->class->suspend); |
1eede070 RW |
859 | } |
860 | if (error) | |
861 | goto End; | |
cd59abfc AS |
862 | } |
863 | ||
1eede070 RW |
864 | if (dev->type) { |
865 | if (dev->type->pm) { | |
866 | pm_dev_dbg(dev, state, "type "); | |
867 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
868 | } |
869 | if (error) | |
870 | goto End; | |
cd59abfc AS |
871 | } |
872 | ||
1eede070 RW |
873 | if (dev->bus) { |
874 | if (dev->bus->pm) { | |
875 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 876 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
877 | } else if (dev->bus->suspend) { |
878 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 879 | error = legacy_suspend(dev, state, dev->bus->suspend); |
1eede070 | 880 | } |
cd59abfc | 881 | } |
5af84b82 RW |
882 | |
883 | if (!error) | |
884 | dev->power.status = DPM_OFF; | |
885 | ||
1eede070 | 886 | End: |
8e9394ce | 887 | device_unlock(dev); |
5af84b82 | 888 | complete_all(&dev->power.completion); |
7a8d37a3 | 889 | |
cd59abfc AS |
890 | return error; |
891 | } | |
892 | ||
5af84b82 RW |
893 | static void async_suspend(void *data, async_cookie_t cookie) |
894 | { | |
895 | struct device *dev = (struct device *)data; | |
896 | int error; | |
897 | ||
898 | error = __device_suspend(dev, pm_transition, true); | |
899 | if (error) { | |
900 | pm_dev_err(dev, pm_transition, " async", error); | |
901 | async_error = error; | |
902 | } | |
903 | ||
904 | put_device(dev); | |
905 | } | |
906 | ||
907 | static int device_suspend(struct device *dev) | |
908 | { | |
909 | INIT_COMPLETION(dev->power.completion); | |
910 | ||
0e06b4a8 | 911 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
912 | get_device(dev); |
913 | async_schedule(async_suspend, dev); | |
914 | return 0; | |
915 | } | |
916 | ||
917 | return __device_suspend(dev, pm_transition, false); | |
918 | } | |
919 | ||
cd59abfc | 920 | /** |
20d652d7 RW |
921 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
922 | * @state: PM transition of the system being carried out. | |
cd59abfc | 923 | */ |
775b64d2 | 924 | static int dpm_suspend(pm_message_t state) |
cd59abfc | 925 | { |
1eede070 | 926 | struct list_head list; |
ecf762b2 | 927 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
928 | int error = 0; |
929 | ||
1eede070 | 930 | INIT_LIST_HEAD(&list); |
cd59abfc | 931 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
932 | pm_transition = state; |
933 | async_error = 0; | |
1eede070 RW |
934 | while (!list_empty(&dpm_list)) { |
935 | struct device *dev = to_device(dpm_list.prev); | |
58aca232 | 936 | |
1eede070 | 937 | get_device(dev); |
cd59abfc | 938 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 939 | |
5af84b82 | 940 | error = device_suspend(dev); |
1eede070 | 941 | |
1b3cbec1 | 942 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 943 | if (error) { |
1eede070 RW |
944 | pm_dev_err(dev, state, "", error); |
945 | put_device(dev); | |
775b64d2 RW |
946 | break; |
947 | } | |
7a8d37a3 | 948 | if (!list_empty(&dev->power.entry)) |
1eede070 RW |
949 | list_move(&dev->power.entry, &list); |
950 | put_device(dev); | |
5af84b82 RW |
951 | if (async_error) |
952 | break; | |
cd59abfc | 953 | } |
1eede070 | 954 | list_splice(&list, dpm_list.prev); |
cd59abfc | 955 | mutex_unlock(&dpm_list_mtx); |
5af84b82 RW |
956 | async_synchronize_full(); |
957 | if (!error) | |
958 | error = async_error; | |
ecf762b2 RW |
959 | if (!error) |
960 | dpm_show_time(starttime, state, NULL); | |
1eede070 RW |
961 | return error; |
962 | } | |
963 | ||
964 | /** | |
20d652d7 RW |
965 | * device_prepare - Prepare a device for system power transition. |
966 | * @dev: Device to handle. | |
967 | * @state: PM transition of the system being carried out. | |
968 | * | |
969 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
970 | * device may be registered after this function has returned. | |
1eede070 | 971 | */ |
d1616302 | 972 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 RW |
973 | { |
974 | int error = 0; | |
975 | ||
8e9394ce | 976 | device_lock(dev); |
1eede070 | 977 | |
adf09493 | 978 | if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { |
1eede070 | 979 | pm_dev_dbg(dev, state, "preparing "); |
adf09493 RW |
980 | error = dev->bus->pm->prepare(dev); |
981 | suspend_report_result(dev->bus->pm->prepare, error); | |
1eede070 RW |
982 | if (error) |
983 | goto End; | |
984 | } | |
985 | ||
986 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { | |
987 | pm_dev_dbg(dev, state, "preparing type "); | |
988 | error = dev->type->pm->prepare(dev); | |
989 | suspend_report_result(dev->type->pm->prepare, error); | |
990 | if (error) | |
991 | goto End; | |
992 | } | |
993 | ||
994 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { | |
995 | pm_dev_dbg(dev, state, "preparing class "); | |
996 | error = dev->class->pm->prepare(dev); | |
997 | suspend_report_result(dev->class->pm->prepare, error); | |
998 | } | |
999 | End: | |
8e9394ce | 1000 | device_unlock(dev); |
1eede070 RW |
1001 | |
1002 | return error; | |
1003 | } | |
cd59abfc | 1004 | |
1eede070 | 1005 | /** |
20d652d7 RW |
1006 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1007 | * @state: PM transition of the system being carried out. | |
1eede070 | 1008 | * |
20d652d7 | 1009 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 RW |
1010 | */ |
1011 | static int dpm_prepare(pm_message_t state) | |
1012 | { | |
1013 | struct list_head list; | |
1014 | int error = 0; | |
1015 | ||
1016 | INIT_LIST_HEAD(&list); | |
1017 | mutex_lock(&dpm_list_mtx); | |
1018 | transition_started = true; | |
1019 | while (!list_empty(&dpm_list)) { | |
1020 | struct device *dev = to_device(dpm_list.next); | |
1021 | ||
1022 | get_device(dev); | |
1023 | dev->power.status = DPM_PREPARING; | |
1024 | mutex_unlock(&dpm_list_mtx); | |
1025 | ||
5e928f77 RW |
1026 | pm_runtime_get_noresume(dev); |
1027 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) { | |
1028 | /* Wake-up requested during system sleep transition. */ | |
aa0baaef | 1029 | pm_runtime_put_sync(dev); |
5e928f77 RW |
1030 | error = -EBUSY; |
1031 | } else { | |
1032 | error = device_prepare(dev, state); | |
1033 | } | |
1eede070 RW |
1034 | |
1035 | mutex_lock(&dpm_list_mtx); | |
1036 | if (error) { | |
1037 | dev->power.status = DPM_ON; | |
1038 | if (error == -EAGAIN) { | |
1039 | put_device(dev); | |
886a7a33 | 1040 | error = 0; |
1eede070 RW |
1041 | continue; |
1042 | } | |
1043 | printk(KERN_ERR "PM: Failed to prepare device %s " | |
1044 | "for power transition: error %d\n", | |
1045 | kobject_name(&dev->kobj), error); | |
1046 | put_device(dev); | |
1047 | break; | |
1048 | } | |
1049 | dev->power.status = DPM_SUSPENDING; | |
1050 | if (!list_empty(&dev->power.entry)) | |
1051 | list_move_tail(&dev->power.entry, &list); | |
1052 | put_device(dev); | |
1053 | } | |
1054 | list_splice(&list, &dpm_list); | |
1055 | mutex_unlock(&dpm_list_mtx); | |
cd59abfc AS |
1056 | return error; |
1057 | } | |
1058 | ||
775b64d2 | 1059 | /** |
20d652d7 RW |
1060 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1061 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1062 | * |
20d652d7 RW |
1063 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1064 | * callbacks for them. | |
775b64d2 | 1065 | */ |
d1616302 | 1066 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1067 | { |
1068 | int error; | |
cd59abfc | 1069 | |
775b64d2 | 1070 | might_sleep(); |
1eede070 RW |
1071 | error = dpm_prepare(state); |
1072 | if (!error) | |
1073 | error = dpm_suspend(state); | |
cd59abfc | 1074 | return error; |
cd59abfc | 1075 | } |
d1616302 | 1076 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1077 | |
1078 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1079 | { | |
c80cfb04 BH |
1080 | if (ret) |
1081 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1082 | } |
1083 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1084 | |
1085 | /** | |
1086 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1087 | * @dev: Device to wait for. | |
1088 | * @subordinate: Device that needs to wait for @dev. | |
1089 | */ | |
1090 | void device_pm_wait_for_dev(struct device *subordinate, struct device *dev) | |
1091 | { | |
1092 | dpm_wait(dev, subordinate->power.async_suspend); | |
1093 | } | |
1094 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |