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