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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 | ||
098dff73 RW |
54 | static int async_error; |
55 | ||
5e928f77 | 56 | /** |
20d652d7 | 57 | * device_pm_init - Initialize the PM-related part of a device object. |
5e928f77 RW |
58 | * @dev: Device object being initialized. |
59 | */ | |
60 | void device_pm_init(struct device *dev) | |
61 | { | |
62 | dev->power.status = DPM_ON; | |
5af84b82 | 63 | init_completion(&dev->power.completion); |
152e1d59 | 64 | complete_all(&dev->power.completion); |
074037ec RW |
65 | dev->power.wakeup = NULL; |
66 | spin_lock_init(&dev->power.lock); | |
5e928f77 RW |
67 | pm_runtime_init(dev); |
68 | } | |
69 | ||
1eede070 | 70 | /** |
20d652d7 | 71 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
72 | */ |
73 | void device_pm_lock(void) | |
74 | { | |
75 | mutex_lock(&dpm_list_mtx); | |
76 | } | |
77 | ||
78 | /** | |
20d652d7 | 79 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
80 | */ |
81 | void device_pm_unlock(void) | |
82 | { | |
83 | mutex_unlock(&dpm_list_mtx); | |
84 | } | |
075c1771 | 85 | |
775b64d2 | 86 | /** |
20d652d7 RW |
87 | * device_pm_add - Add a device to the PM core's list of active devices. |
88 | * @dev: Device to add to the list. | |
775b64d2 | 89 | */ |
3b98aeaf | 90 | void device_pm_add(struct device *dev) |
1da177e4 | 91 | { |
1da177e4 | 92 | pr_debug("PM: Adding info for %s:%s\n", |
c48ea603 DT |
93 | dev->bus ? dev->bus->name : "No Bus", |
94 | kobject_name(&dev->kobj)); | |
11048dcf | 95 | mutex_lock(&dpm_list_mtx); |
1eede070 | 96 | if (dev->parent) { |
f5a6d958 RW |
97 | if (dev->parent->power.status >= DPM_SUSPENDING) |
98 | dev_warn(dev, "parent %s should not be sleeping\n", | |
1e0b2cf9 | 99 | dev_name(dev->parent)); |
1eede070 RW |
100 | } else if (transition_started) { |
101 | /* | |
102 | * We refuse to register parentless devices while a PM | |
103 | * transition is in progress in order to avoid leaving them | |
104 | * unhandled down the road | |
105 | */ | |
728f0893 | 106 | dev_WARN(dev, "Parentless device registered during a PM transaction\n"); |
58aca232 | 107 | } |
3b98aeaf AS |
108 | |
109 | list_add_tail(&dev->power.entry, &dpm_list); | |
11048dcf | 110 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
111 | } |
112 | ||
775b64d2 | 113 | /** |
20d652d7 RW |
114 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
115 | * @dev: Device to be removed from the list. | |
775b64d2 | 116 | */ |
9cddad77 | 117 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
118 | { |
119 | pr_debug("PM: Removing info for %s:%s\n", | |
c48ea603 DT |
120 | dev->bus ? dev->bus->name : "No Bus", |
121 | kobject_name(&dev->kobj)); | |
5af84b82 | 122 | complete_all(&dev->power.completion); |
11048dcf | 123 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 124 | list_del_init(&dev->power.entry); |
11048dcf | 125 | mutex_unlock(&dpm_list_mtx); |
074037ec | 126 | device_wakeup_disable(dev); |
5e928f77 | 127 | pm_runtime_remove(dev); |
775b64d2 RW |
128 | } |
129 | ||
ffa6a705 | 130 | /** |
20d652d7 RW |
131 | * device_pm_move_before - Move device in the PM core's list of active devices. |
132 | * @deva: Device to move in dpm_list. | |
133 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
134 | */ |
135 | void device_pm_move_before(struct device *deva, struct device *devb) | |
136 | { | |
137 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
138 | deva->bus ? deva->bus->name : "No Bus", | |
139 | kobject_name(&deva->kobj), | |
140 | devb->bus ? devb->bus->name : "No Bus", | |
141 | kobject_name(&devb->kobj)); | |
142 | /* Delete deva from dpm_list and reinsert before devb. */ | |
143 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
144 | } | |
145 | ||
146 | /** | |
20d652d7 RW |
147 | * device_pm_move_after - Move device in the PM core's list of active devices. |
148 | * @deva: Device to move in dpm_list. | |
149 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
150 | */ |
151 | void device_pm_move_after(struct device *deva, struct device *devb) | |
152 | { | |
153 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
154 | deva->bus ? deva->bus->name : "No Bus", | |
155 | kobject_name(&deva->kobj), | |
156 | devb->bus ? devb->bus->name : "No Bus", | |
157 | kobject_name(&devb->kobj)); | |
158 | /* Delete deva from dpm_list and reinsert after devb. */ | |
159 | list_move(&deva->power.entry, &devb->power.entry); | |
160 | } | |
161 | ||
162 | /** | |
20d652d7 RW |
163 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
164 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
165 | */ |
166 | void device_pm_move_last(struct device *dev) | |
167 | { | |
168 | pr_debug("PM: Moving %s:%s to end of list\n", | |
169 | dev->bus ? dev->bus->name : "No Bus", | |
170 | kobject_name(&dev->kobj)); | |
171 | list_move_tail(&dev->power.entry, &dpm_list); | |
172 | } | |
173 | ||
875ab0b7 RW |
174 | static ktime_t initcall_debug_start(struct device *dev) |
175 | { | |
176 | ktime_t calltime = ktime_set(0, 0); | |
177 | ||
178 | if (initcall_debug) { | |
179 | pr_info("calling %s+ @ %i\n", | |
180 | dev_name(dev), task_pid_nr(current)); | |
181 | calltime = ktime_get(); | |
182 | } | |
183 | ||
184 | return calltime; | |
185 | } | |
186 | ||
187 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
188 | int error) | |
189 | { | |
190 | ktime_t delta, rettime; | |
191 | ||
192 | if (initcall_debug) { | |
193 | rettime = ktime_get(); | |
194 | delta = ktime_sub(rettime, calltime); | |
195 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), | |
196 | error, (unsigned long long)ktime_to_ns(delta) >> 10); | |
197 | } | |
198 | } | |
199 | ||
5af84b82 RW |
200 | /** |
201 | * dpm_wait - Wait for a PM operation to complete. | |
202 | * @dev: Device to wait for. | |
203 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
204 | */ | |
205 | static void dpm_wait(struct device *dev, bool async) | |
206 | { | |
207 | if (!dev) | |
208 | return; | |
209 | ||
0e06b4a8 | 210 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
211 | wait_for_completion(&dev->power.completion); |
212 | } | |
213 | ||
214 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
215 | { | |
216 | dpm_wait(dev, *((bool *)async_ptr)); | |
217 | return 0; | |
218 | } | |
219 | ||
220 | static void dpm_wait_for_children(struct device *dev, bool async) | |
221 | { | |
222 | device_for_each_child(dev, &async, dpm_wait_fn); | |
223 | } | |
224 | ||
1eede070 | 225 | /** |
20d652d7 RW |
226 | * pm_op - Execute the PM operation appropriate for given PM event. |
227 | * @dev: Device to handle. | |
228 | * @ops: PM operations to choose from. | |
229 | * @state: PM transition of the system being carried out. | |
1eede070 | 230 | */ |
d9ab7716 DT |
231 | static int pm_op(struct device *dev, |
232 | const struct dev_pm_ops *ops, | |
233 | pm_message_t state) | |
1eede070 RW |
234 | { |
235 | int error = 0; | |
875ab0b7 | 236 | ktime_t calltime; |
f2511774 | 237 | |
875ab0b7 | 238 | calltime = initcall_debug_start(dev); |
1eede070 RW |
239 | |
240 | switch (state.event) { | |
241 | #ifdef CONFIG_SUSPEND | |
242 | case PM_EVENT_SUSPEND: | |
243 | if (ops->suspend) { | |
244 | error = ops->suspend(dev); | |
245 | suspend_report_result(ops->suspend, error); | |
246 | } | |
247 | break; | |
248 | case PM_EVENT_RESUME: | |
249 | if (ops->resume) { | |
250 | error = ops->resume(dev); | |
251 | suspend_report_result(ops->resume, error); | |
252 | } | |
253 | break; | |
254 | #endif /* CONFIG_SUSPEND */ | |
255 | #ifdef CONFIG_HIBERNATION | |
256 | case PM_EVENT_FREEZE: | |
257 | case PM_EVENT_QUIESCE: | |
258 | if (ops->freeze) { | |
259 | error = ops->freeze(dev); | |
260 | suspend_report_result(ops->freeze, error); | |
261 | } | |
262 | break; | |
263 | case PM_EVENT_HIBERNATE: | |
264 | if (ops->poweroff) { | |
265 | error = ops->poweroff(dev); | |
266 | suspend_report_result(ops->poweroff, error); | |
267 | } | |
268 | break; | |
269 | case PM_EVENT_THAW: | |
270 | case PM_EVENT_RECOVER: | |
271 | if (ops->thaw) { | |
272 | error = ops->thaw(dev); | |
273 | suspend_report_result(ops->thaw, error); | |
274 | } | |
275 | break; | |
276 | case PM_EVENT_RESTORE: | |
277 | if (ops->restore) { | |
278 | error = ops->restore(dev); | |
279 | suspend_report_result(ops->restore, error); | |
280 | } | |
281 | break; | |
282 | #endif /* CONFIG_HIBERNATION */ | |
283 | default: | |
284 | error = -EINVAL; | |
285 | } | |
f2511774 | 286 | |
875ab0b7 | 287 | initcall_debug_report(dev, calltime, error); |
f2511774 | 288 | |
1eede070 RW |
289 | return error; |
290 | } | |
291 | ||
292 | /** | |
20d652d7 RW |
293 | * pm_noirq_op - Execute the PM operation appropriate for given PM event. |
294 | * @dev: Device to handle. | |
295 | * @ops: PM operations to choose from. | |
296 | * @state: PM transition of the system being carried out. | |
1eede070 | 297 | * |
20d652d7 RW |
298 | * The driver of @dev will not receive interrupts while this function is being |
299 | * executed. | |
1eede070 | 300 | */ |
d9ab7716 DT |
301 | static int pm_noirq_op(struct device *dev, |
302 | const struct dev_pm_ops *ops, | |
1eede070 RW |
303 | pm_message_t state) |
304 | { | |
305 | int error = 0; | |
f2511774 AV |
306 | ktime_t calltime, delta, rettime; |
307 | ||
308 | if (initcall_debug) { | |
8cc6b39f RW |
309 | pr_info("calling %s+ @ %i, parent: %s\n", |
310 | dev_name(dev), task_pid_nr(current), | |
311 | dev->parent ? dev_name(dev->parent) : "none"); | |
f2511774 AV |
312 | calltime = ktime_get(); |
313 | } | |
1eede070 RW |
314 | |
315 | switch (state.event) { | |
316 | #ifdef CONFIG_SUSPEND | |
317 | case PM_EVENT_SUSPEND: | |
318 | if (ops->suspend_noirq) { | |
319 | error = ops->suspend_noirq(dev); | |
320 | suspend_report_result(ops->suspend_noirq, error); | |
321 | } | |
322 | break; | |
323 | case PM_EVENT_RESUME: | |
324 | if (ops->resume_noirq) { | |
325 | error = ops->resume_noirq(dev); | |
326 | suspend_report_result(ops->resume_noirq, error); | |
327 | } | |
328 | break; | |
329 | #endif /* CONFIG_SUSPEND */ | |
330 | #ifdef CONFIG_HIBERNATION | |
331 | case PM_EVENT_FREEZE: | |
332 | case PM_EVENT_QUIESCE: | |
333 | if (ops->freeze_noirq) { | |
334 | error = ops->freeze_noirq(dev); | |
335 | suspend_report_result(ops->freeze_noirq, error); | |
336 | } | |
337 | break; | |
338 | case PM_EVENT_HIBERNATE: | |
339 | if (ops->poweroff_noirq) { | |
340 | error = ops->poweroff_noirq(dev); | |
341 | suspend_report_result(ops->poweroff_noirq, error); | |
342 | } | |
343 | break; | |
344 | case PM_EVENT_THAW: | |
345 | case PM_EVENT_RECOVER: | |
346 | if (ops->thaw_noirq) { | |
347 | error = ops->thaw_noirq(dev); | |
348 | suspend_report_result(ops->thaw_noirq, error); | |
349 | } | |
350 | break; | |
351 | case PM_EVENT_RESTORE: | |
352 | if (ops->restore_noirq) { | |
353 | error = ops->restore_noirq(dev); | |
354 | suspend_report_result(ops->restore_noirq, error); | |
355 | } | |
356 | break; | |
357 | #endif /* CONFIG_HIBERNATION */ | |
358 | default: | |
359 | error = -EINVAL; | |
360 | } | |
f2511774 AV |
361 | |
362 | if (initcall_debug) { | |
363 | rettime = ktime_get(); | |
364 | delta = ktime_sub(rettime, calltime); | |
875ab0b7 RW |
365 | printk("initcall %s_i+ returned %d after %Ld usecs\n", |
366 | dev_name(dev), error, | |
367 | (unsigned long long)ktime_to_ns(delta) >> 10); | |
f2511774 AV |
368 | } |
369 | ||
1eede070 RW |
370 | return error; |
371 | } | |
372 | ||
373 | static char *pm_verb(int event) | |
374 | { | |
375 | switch (event) { | |
376 | case PM_EVENT_SUSPEND: | |
377 | return "suspend"; | |
378 | case PM_EVENT_RESUME: | |
379 | return "resume"; | |
380 | case PM_EVENT_FREEZE: | |
381 | return "freeze"; | |
382 | case PM_EVENT_QUIESCE: | |
383 | return "quiesce"; | |
384 | case PM_EVENT_HIBERNATE: | |
385 | return "hibernate"; | |
386 | case PM_EVENT_THAW: | |
387 | return "thaw"; | |
388 | case PM_EVENT_RESTORE: | |
389 | return "restore"; | |
390 | case PM_EVENT_RECOVER: | |
391 | return "recover"; | |
392 | default: | |
393 | return "(unknown PM event)"; | |
394 | } | |
395 | } | |
396 | ||
397 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) | |
398 | { | |
399 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
400 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
401 | ", may wakeup" : ""); | |
402 | } | |
403 | ||
404 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
405 | int error) | |
406 | { | |
407 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
408 | kobject_name(&dev->kobj), pm_verb(state.event), info, error); | |
409 | } | |
410 | ||
ecf762b2 RW |
411 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
412 | { | |
413 | ktime_t calltime; | |
0702d9ee | 414 | u64 usecs64; |
ecf762b2 RW |
415 | int usecs; |
416 | ||
417 | calltime = ktime_get(); | |
418 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
419 | do_div(usecs64, NSEC_PER_USEC); | |
420 | usecs = usecs64; | |
421 | if (usecs == 0) | |
422 | usecs = 1; | |
423 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
424 | info ?: "", info ? " " : "", pm_verb(state.event), | |
425 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
426 | } | |
427 | ||
cd59abfc AS |
428 | /*------------------------- Resume routines -------------------------*/ |
429 | ||
430 | /** | |
20d652d7 RW |
431 | * device_resume_noirq - Execute an "early resume" callback for given device. |
432 | * @dev: Device to handle. | |
433 | * @state: PM transition of the system being carried out. | |
cd59abfc | 434 | * |
20d652d7 RW |
435 | * The driver of @dev will not receive interrupts while this function is being |
436 | * executed. | |
cd59abfc | 437 | */ |
d1616302 | 438 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
cd59abfc AS |
439 | { |
440 | int error = 0; | |
441 | ||
442 | TRACE_DEVICE(dev); | |
443 | TRACE_RESUME(0); | |
444 | ||
33c33740 | 445 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
446 | pm_dev_dbg(dev, state, "EARLY "); |
447 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
e7176a37 DB |
448 | if (error) |
449 | goto End; | |
775b64d2 | 450 | } |
33c33740 | 451 | |
e7176a37 DB |
452 | if (dev->type && dev->type->pm) { |
453 | pm_dev_dbg(dev, state, "EARLY type "); | |
454 | error = pm_noirq_op(dev, dev->type->pm, state); | |
455 | if (error) | |
456 | goto End; | |
457 | } | |
458 | ||
459 | if (dev->class && dev->class->pm) { | |
460 | pm_dev_dbg(dev, state, "EARLY class "); | |
461 | error = pm_noirq_op(dev, dev->class->pm, state); | |
462 | } | |
463 | ||
464 | End: | |
775b64d2 RW |
465 | TRACE_RESUME(error); |
466 | return error; | |
467 | } | |
468 | ||
469 | /** | |
20d652d7 RW |
470 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
471 | * @state: PM transition of the system being carried out. | |
775b64d2 | 472 | * |
20d652d7 RW |
473 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
474 | * enable device drivers to receive interrupts. | |
775b64d2 | 475 | */ |
d1616302 | 476 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 477 | { |
1eede070 | 478 | struct device *dev; |
ecf762b2 | 479 | ktime_t starttime = ktime_get(); |
775b64d2 | 480 | |
32bdfac5 | 481 | mutex_lock(&dpm_list_mtx); |
3eb132c9 | 482 | transition_started = false; |
1eede070 RW |
483 | list_for_each_entry(dev, &dpm_list, power.entry) |
484 | if (dev->power.status > DPM_OFF) { | |
485 | int error; | |
775b64d2 | 486 | |
1eede070 | 487 | dev->power.status = DPM_OFF; |
d1616302 | 488 | error = device_resume_noirq(dev, state); |
1eede070 RW |
489 | if (error) |
490 | pm_dev_err(dev, state, " early", error); | |
491 | } | |
32bdfac5 | 492 | mutex_unlock(&dpm_list_mtx); |
ecf762b2 | 493 | dpm_show_time(starttime, state, "early"); |
2ed8d2b3 | 494 | resume_device_irqs(); |
775b64d2 | 495 | } |
d1616302 | 496 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
775b64d2 | 497 | |
875ab0b7 RW |
498 | /** |
499 | * legacy_resume - Execute a legacy (bus or class) resume callback for device. | |
0a884223 RD |
500 | * @dev: Device to resume. |
501 | * @cb: Resume callback to execute. | |
875ab0b7 RW |
502 | */ |
503 | static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) | |
504 | { | |
505 | int error; | |
506 | ktime_t calltime; | |
507 | ||
508 | calltime = initcall_debug_start(dev); | |
509 | ||
510 | error = cb(dev); | |
511 | suspend_report_result(cb, error); | |
512 | ||
513 | initcall_debug_report(dev, calltime, error); | |
514 | ||
515 | return error; | |
516 | } | |
517 | ||
775b64d2 | 518 | /** |
97df8c12 | 519 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
520 | * @dev: Device to handle. |
521 | * @state: PM transition of the system being carried out. | |
5af84b82 | 522 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 523 | */ |
97df8c12 | 524 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 RW |
525 | { |
526 | int error = 0; | |
527 | ||
528 | TRACE_DEVICE(dev); | |
529 | TRACE_RESUME(0); | |
cd59abfc | 530 | |
5af84b82 | 531 | dpm_wait(dev->parent, async); |
8e9394ce | 532 | device_lock(dev); |
7a8d37a3 | 533 | |
97df8c12 RW |
534 | dev->power.status = DPM_RESUMING; |
535 | ||
1eede070 RW |
536 | if (dev->bus) { |
537 | if (dev->bus->pm) { | |
538 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 539 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
540 | } else if (dev->bus->resume) { |
541 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 542 | error = legacy_resume(dev, dev->bus->resume); |
1eede070 RW |
543 | } |
544 | if (error) | |
545 | goto End; | |
cd59abfc AS |
546 | } |
547 | ||
1eede070 RW |
548 | if (dev->type) { |
549 | if (dev->type->pm) { | |
550 | pm_dev_dbg(dev, state, "type "); | |
551 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
552 | } |
553 | if (error) | |
554 | goto End; | |
cd59abfc AS |
555 | } |
556 | ||
1eede070 RW |
557 | if (dev->class) { |
558 | if (dev->class->pm) { | |
559 | pm_dev_dbg(dev, state, "class "); | |
560 | error = pm_op(dev, dev->class->pm, state); | |
561 | } else if (dev->class->resume) { | |
562 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 563 | error = legacy_resume(dev, dev->class->resume); |
1eede070 | 564 | } |
cd59abfc | 565 | } |
1eede070 | 566 | End: |
8e9394ce | 567 | device_unlock(dev); |
5af84b82 | 568 | complete_all(&dev->power.completion); |
7a8d37a3 | 569 | |
cd59abfc AS |
570 | TRACE_RESUME(error); |
571 | return error; | |
572 | } | |
573 | ||
5af84b82 RW |
574 | static void async_resume(void *data, async_cookie_t cookie) |
575 | { | |
576 | struct device *dev = (struct device *)data; | |
577 | int error; | |
578 | ||
97df8c12 | 579 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
580 | if (error) |
581 | pm_dev_err(dev, pm_transition, " async", error); | |
582 | put_device(dev); | |
583 | } | |
584 | ||
97df8c12 | 585 | static bool is_async(struct device *dev) |
5af84b82 | 586 | { |
97df8c12 RW |
587 | return dev->power.async_suspend && pm_async_enabled |
588 | && !pm_trace_is_enabled(); | |
5af84b82 RW |
589 | } |
590 | ||
775b64d2 | 591 | /** |
20d652d7 RW |
592 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
593 | * @state: PM transition of the system being carried out. | |
775b64d2 | 594 | * |
20d652d7 RW |
595 | * Execute the appropriate "resume" callback for all devices whose status |
596 | * indicates that they are suspended. | |
1eede070 RW |
597 | */ |
598 | static void dpm_resume(pm_message_t state) | |
599 | { | |
600 | struct list_head list; | |
97df8c12 | 601 | struct device *dev; |
ecf762b2 | 602 | ktime_t starttime = ktime_get(); |
1eede070 RW |
603 | |
604 | INIT_LIST_HEAD(&list); | |
605 | mutex_lock(&dpm_list_mtx); | |
5af84b82 | 606 | pm_transition = state; |
098dff73 | 607 | async_error = 0; |
1eede070 | 608 | |
97df8c12 RW |
609 | list_for_each_entry(dev, &dpm_list, power.entry) { |
610 | if (dev->power.status < DPM_OFF) | |
611 | continue; | |
612 | ||
613 | INIT_COMPLETION(dev->power.completion); | |
614 | if (is_async(dev)) { | |
615 | get_device(dev); | |
616 | async_schedule(async_resume, dev); | |
617 | } | |
618 | } | |
619 | ||
620 | while (!list_empty(&dpm_list)) { | |
621 | dev = to_device(dpm_list.next); | |
1eede070 | 622 | get_device(dev); |
97df8c12 | 623 | if (dev->power.status >= DPM_OFF && !is_async(dev)) { |
1eede070 RW |
624 | int error; |
625 | ||
1eede070 RW |
626 | mutex_unlock(&dpm_list_mtx); |
627 | ||
97df8c12 | 628 | error = device_resume(dev, state, false); |
1eede070 RW |
629 | |
630 | mutex_lock(&dpm_list_mtx); | |
631 | if (error) | |
632 | pm_dev_err(dev, state, "", error); | |
633 | } else if (dev->power.status == DPM_SUSPENDING) { | |
634 | /* Allow new children of the device to be registered */ | |
635 | dev->power.status = DPM_RESUMING; | |
636 | } | |
637 | if (!list_empty(&dev->power.entry)) | |
638 | list_move_tail(&dev->power.entry, &list); | |
639 | put_device(dev); | |
640 | } | |
641 | list_splice(&list, &dpm_list); | |
642 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 | 643 | async_synchronize_full(); |
ecf762b2 | 644 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
645 | } |
646 | ||
647 | /** | |
20d652d7 RW |
648 | * device_complete - Complete a PM transition for given device. |
649 | * @dev: Device to handle. | |
650 | * @state: PM transition of the system being carried out. | |
1eede070 | 651 | */ |
d1616302 | 652 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 653 | { |
8e9394ce | 654 | device_lock(dev); |
1eede070 RW |
655 | |
656 | if (dev->class && dev->class->pm && dev->class->pm->complete) { | |
657 | pm_dev_dbg(dev, state, "completing class "); | |
658 | dev->class->pm->complete(dev); | |
659 | } | |
660 | ||
661 | if (dev->type && dev->type->pm && dev->type->pm->complete) { | |
662 | pm_dev_dbg(dev, state, "completing type "); | |
663 | dev->type->pm->complete(dev); | |
664 | } | |
665 | ||
adf09493 | 666 | if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { |
1eede070 | 667 | pm_dev_dbg(dev, state, "completing "); |
adf09493 | 668 | dev->bus->pm->complete(dev); |
1eede070 RW |
669 | } |
670 | ||
8e9394ce | 671 | device_unlock(dev); |
1eede070 RW |
672 | } |
673 | ||
674 | /** | |
20d652d7 RW |
675 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
676 | * @state: PM transition of the system being carried out. | |
775b64d2 | 677 | * |
20d652d7 RW |
678 | * Execute the ->complete() callbacks for all devices whose PM status is not |
679 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 680 | */ |
1eede070 | 681 | static void dpm_complete(pm_message_t state) |
cd59abfc | 682 | { |
1eede070 RW |
683 | struct list_head list; |
684 | ||
685 | INIT_LIST_HEAD(&list); | |
cd59abfc | 686 | mutex_lock(&dpm_list_mtx); |
e528e876 | 687 | transition_started = false; |
1eede070 RW |
688 | while (!list_empty(&dpm_list)) { |
689 | struct device *dev = to_device(dpm_list.prev); | |
cd59abfc | 690 | |
1eede070 RW |
691 | get_device(dev); |
692 | if (dev->power.status > DPM_ON) { | |
693 | dev->power.status = DPM_ON; | |
694 | mutex_unlock(&dpm_list_mtx); | |
695 | ||
d1616302 | 696 | device_complete(dev, state); |
aa0baaef | 697 | pm_runtime_put_sync(dev); |
1eede070 RW |
698 | |
699 | mutex_lock(&dpm_list_mtx); | |
700 | } | |
701 | if (!list_empty(&dev->power.entry)) | |
702 | list_move(&dev->power.entry, &list); | |
703 | put_device(dev); | |
cd59abfc | 704 | } |
1eede070 | 705 | list_splice(&list, &dpm_list); |
cd59abfc AS |
706 | mutex_unlock(&dpm_list_mtx); |
707 | } | |
708 | ||
cd59abfc | 709 | /** |
20d652d7 RW |
710 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
711 | * @state: PM transition of the system being carried out. | |
cd59abfc | 712 | * |
20d652d7 RW |
713 | * Execute "resume" callbacks for all devices and complete the PM transition of |
714 | * the system. | |
cd59abfc | 715 | */ |
d1616302 | 716 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 717 | { |
775b64d2 | 718 | might_sleep(); |
1eede070 RW |
719 | dpm_resume(state); |
720 | dpm_complete(state); | |
cd59abfc | 721 | } |
d1616302 | 722 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
723 | |
724 | ||
725 | /*------------------------- Suspend routines -------------------------*/ | |
726 | ||
1eede070 | 727 | /** |
20d652d7 RW |
728 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
729 | * @sleep_state: PM message representing a sleep state. | |
730 | * | |
731 | * Return a PM message representing the resume event corresponding to given | |
732 | * sleep state. | |
1eede070 RW |
733 | */ |
734 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 735 | { |
1eede070 RW |
736 | switch (sleep_state.event) { |
737 | case PM_EVENT_SUSPEND: | |
738 | return PMSG_RESUME; | |
739 | case PM_EVENT_FREEZE: | |
740 | case PM_EVENT_QUIESCE: | |
741 | return PMSG_RECOVER; | |
742 | case PM_EVENT_HIBERNATE: | |
743 | return PMSG_RESTORE; | |
cd59abfc | 744 | } |
1eede070 | 745 | return PMSG_ON; |
cd59abfc AS |
746 | } |
747 | ||
748 | /** | |
20d652d7 RW |
749 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
750 | * @dev: Device to handle. | |
751 | * @state: PM transition of the system being carried out. | |
775b64d2 | 752 | * |
20d652d7 RW |
753 | * The driver of @dev will not receive interrupts while this function is being |
754 | * executed. | |
cd59abfc | 755 | */ |
d1616302 | 756 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 RW |
757 | { |
758 | int error = 0; | |
cd59abfc | 759 | |
e7176a37 DB |
760 | if (dev->class && dev->class->pm) { |
761 | pm_dev_dbg(dev, state, "LATE class "); | |
762 | error = pm_noirq_op(dev, dev->class->pm, state); | |
763 | if (error) | |
764 | goto End; | |
765 | } | |
766 | ||
767 | if (dev->type && dev->type->pm) { | |
768 | pm_dev_dbg(dev, state, "LATE type "); | |
769 | error = pm_noirq_op(dev, dev->type->pm, state); | |
770 | if (error) | |
771 | goto End; | |
772 | } | |
773 | ||
33c33740 | 774 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
775 | pm_dev_dbg(dev, state, "LATE "); |
776 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
775b64d2 | 777 | } |
e7176a37 DB |
778 | |
779 | End: | |
775b64d2 RW |
780 | return error; |
781 | } | |
782 | ||
783 | /** | |
20d652d7 RW |
784 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
785 | * @state: PM transition of the system being carried out. | |
775b64d2 | 786 | * |
20d652d7 RW |
787 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
788 | * handlers for all non-sysdev devices. | |
775b64d2 | 789 | */ |
d1616302 | 790 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 791 | { |
1eede070 | 792 | struct device *dev; |
ecf762b2 | 793 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
794 | int error = 0; |
795 | ||
2ed8d2b3 | 796 | suspend_device_irqs(); |
32bdfac5 | 797 | mutex_lock(&dpm_list_mtx); |
1eede070 | 798 | list_for_each_entry_reverse(dev, &dpm_list, power.entry) { |
d1616302 | 799 | error = device_suspend_noirq(dev, state); |
775b64d2 | 800 | if (error) { |
1eede070 | 801 | pm_dev_err(dev, state, " late", error); |
775b64d2 RW |
802 | break; |
803 | } | |
1eede070 | 804 | dev->power.status = DPM_OFF_IRQ; |
775b64d2 | 805 | } |
32bdfac5 | 806 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 807 | if (error) |
d1616302 | 808 | dpm_resume_noirq(resume_event(state)); |
ecf762b2 RW |
809 | else |
810 | dpm_show_time(starttime, state, "late"); | |
775b64d2 RW |
811 | return error; |
812 | } | |
d1616302 | 813 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
775b64d2 | 814 | |
875ab0b7 RW |
815 | /** |
816 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
817 | * @dev: Device to suspend. |
818 | * @state: PM transition of the system being carried out. | |
819 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
820 | */ |
821 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
822 | int (*cb)(struct device *dev, pm_message_t state)) | |
823 | { | |
824 | int error; | |
825 | ktime_t calltime; | |
826 | ||
827 | calltime = initcall_debug_start(dev); | |
828 | ||
829 | error = cb(dev, state); | |
830 | suspend_report_result(cb, error); | |
831 | ||
832 | initcall_debug_report(dev, calltime, error); | |
833 | ||
834 | return error; | |
835 | } | |
836 | ||
775b64d2 | 837 | /** |
20d652d7 RW |
838 | * device_suspend - Execute "suspend" callbacks for given device. |
839 | * @dev: Device to handle. | |
840 | * @state: PM transition of the system being carried out. | |
5af84b82 | 841 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 842 | */ |
5af84b82 | 843 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc AS |
844 | { |
845 | int error = 0; | |
846 | ||
5af84b82 | 847 | dpm_wait_for_children(dev, async); |
8e9394ce | 848 | device_lock(dev); |
7a8d37a3 | 849 | |
5af84b82 RW |
850 | if (async_error) |
851 | goto End; | |
852 | ||
1eede070 RW |
853 | if (dev->class) { |
854 | if (dev->class->pm) { | |
855 | pm_dev_dbg(dev, state, "class "); | |
856 | error = pm_op(dev, dev->class->pm, state); | |
857 | } else if (dev->class->suspend) { | |
858 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 859 | error = legacy_suspend(dev, state, dev->class->suspend); |
1eede070 RW |
860 | } |
861 | if (error) | |
862 | goto End; | |
cd59abfc AS |
863 | } |
864 | ||
1eede070 RW |
865 | if (dev->type) { |
866 | if (dev->type->pm) { | |
867 | pm_dev_dbg(dev, state, "type "); | |
868 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
869 | } |
870 | if (error) | |
871 | goto End; | |
cd59abfc AS |
872 | } |
873 | ||
1eede070 RW |
874 | if (dev->bus) { |
875 | if (dev->bus->pm) { | |
876 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 877 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
878 | } else if (dev->bus->suspend) { |
879 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 880 | error = legacy_suspend(dev, state, dev->bus->suspend); |
1eede070 | 881 | } |
cd59abfc | 882 | } |
5af84b82 RW |
883 | |
884 | if (!error) | |
885 | dev->power.status = DPM_OFF; | |
886 | ||
1eede070 | 887 | End: |
8e9394ce | 888 | device_unlock(dev); |
5af84b82 | 889 | complete_all(&dev->power.completion); |
7a8d37a3 | 890 | |
098dff73 RW |
891 | if (error) |
892 | async_error = error; | |
893 | ||
cd59abfc AS |
894 | return error; |
895 | } | |
896 | ||
5af84b82 RW |
897 | static void async_suspend(void *data, async_cookie_t cookie) |
898 | { | |
899 | struct device *dev = (struct device *)data; | |
900 | int error; | |
901 | ||
902 | error = __device_suspend(dev, pm_transition, true); | |
098dff73 | 903 | if (error) |
5af84b82 | 904 | pm_dev_err(dev, pm_transition, " async", error); |
5af84b82 RW |
905 | |
906 | put_device(dev); | |
907 | } | |
908 | ||
909 | static int device_suspend(struct device *dev) | |
910 | { | |
911 | INIT_COMPLETION(dev->power.completion); | |
912 | ||
0e06b4a8 | 913 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
914 | get_device(dev); |
915 | async_schedule(async_suspend, dev); | |
916 | return 0; | |
917 | } | |
918 | ||
919 | return __device_suspend(dev, pm_transition, false); | |
920 | } | |
921 | ||
cd59abfc | 922 | /** |
20d652d7 RW |
923 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
924 | * @state: PM transition of the system being carried out. | |
cd59abfc | 925 | */ |
775b64d2 | 926 | static int dpm_suspend(pm_message_t state) |
cd59abfc | 927 | { |
1eede070 | 928 | struct list_head list; |
ecf762b2 | 929 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
930 | int error = 0; |
931 | ||
1eede070 | 932 | INIT_LIST_HEAD(&list); |
cd59abfc | 933 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
934 | pm_transition = state; |
935 | async_error = 0; | |
1eede070 RW |
936 | while (!list_empty(&dpm_list)) { |
937 | struct device *dev = to_device(dpm_list.prev); | |
58aca232 | 938 | |
1eede070 | 939 | get_device(dev); |
cd59abfc | 940 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 941 | |
5af84b82 | 942 | error = device_suspend(dev); |
1eede070 | 943 | |
1b3cbec1 | 944 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 945 | if (error) { |
1eede070 RW |
946 | pm_dev_err(dev, state, "", error); |
947 | put_device(dev); | |
775b64d2 RW |
948 | break; |
949 | } | |
7a8d37a3 | 950 | if (!list_empty(&dev->power.entry)) |
1eede070 RW |
951 | list_move(&dev->power.entry, &list); |
952 | put_device(dev); | |
5af84b82 RW |
953 | if (async_error) |
954 | break; | |
cd59abfc | 955 | } |
1eede070 | 956 | list_splice(&list, dpm_list.prev); |
cd59abfc | 957 | mutex_unlock(&dpm_list_mtx); |
5af84b82 RW |
958 | async_synchronize_full(); |
959 | if (!error) | |
960 | error = async_error; | |
ecf762b2 RW |
961 | if (!error) |
962 | dpm_show_time(starttime, state, NULL); | |
1eede070 RW |
963 | return error; |
964 | } | |
965 | ||
966 | /** | |
20d652d7 RW |
967 | * device_prepare - Prepare a device for system power transition. |
968 | * @dev: Device to handle. | |
969 | * @state: PM transition of the system being carried out. | |
970 | * | |
971 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
972 | * device may be registered after this function has returned. | |
1eede070 | 973 | */ |
d1616302 | 974 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 RW |
975 | { |
976 | int error = 0; | |
977 | ||
8e9394ce | 978 | device_lock(dev); |
1eede070 | 979 | |
adf09493 | 980 | if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { |
1eede070 | 981 | pm_dev_dbg(dev, state, "preparing "); |
adf09493 RW |
982 | error = dev->bus->pm->prepare(dev); |
983 | suspend_report_result(dev->bus->pm->prepare, error); | |
1eede070 RW |
984 | if (error) |
985 | goto End; | |
986 | } | |
987 | ||
988 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { | |
989 | pm_dev_dbg(dev, state, "preparing type "); | |
990 | error = dev->type->pm->prepare(dev); | |
991 | suspend_report_result(dev->type->pm->prepare, error); | |
992 | if (error) | |
993 | goto End; | |
994 | } | |
995 | ||
996 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { | |
997 | pm_dev_dbg(dev, state, "preparing class "); | |
998 | error = dev->class->pm->prepare(dev); | |
999 | suspend_report_result(dev->class->pm->prepare, error); | |
1000 | } | |
1001 | End: | |
8e9394ce | 1002 | device_unlock(dev); |
1eede070 RW |
1003 | |
1004 | return error; | |
1005 | } | |
cd59abfc | 1006 | |
1eede070 | 1007 | /** |
20d652d7 RW |
1008 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1009 | * @state: PM transition of the system being carried out. | |
1eede070 | 1010 | * |
20d652d7 | 1011 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 RW |
1012 | */ |
1013 | static int dpm_prepare(pm_message_t state) | |
1014 | { | |
1015 | struct list_head list; | |
1016 | int error = 0; | |
1017 | ||
1018 | INIT_LIST_HEAD(&list); | |
1019 | mutex_lock(&dpm_list_mtx); | |
1020 | transition_started = true; | |
1021 | while (!list_empty(&dpm_list)) { | |
1022 | struct device *dev = to_device(dpm_list.next); | |
1023 | ||
1024 | get_device(dev); | |
1025 | dev->power.status = DPM_PREPARING; | |
1026 | mutex_unlock(&dpm_list_mtx); | |
1027 | ||
5e928f77 RW |
1028 | pm_runtime_get_noresume(dev); |
1029 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) { | |
1030 | /* Wake-up requested during system sleep transition. */ | |
aa0baaef | 1031 | pm_runtime_put_sync(dev); |
5e928f77 RW |
1032 | error = -EBUSY; |
1033 | } else { | |
1034 | error = device_prepare(dev, state); | |
1035 | } | |
1eede070 RW |
1036 | |
1037 | mutex_lock(&dpm_list_mtx); | |
1038 | if (error) { | |
1039 | dev->power.status = DPM_ON; | |
1040 | if (error == -EAGAIN) { | |
1041 | put_device(dev); | |
886a7a33 | 1042 | error = 0; |
1eede070 RW |
1043 | continue; |
1044 | } | |
1045 | printk(KERN_ERR "PM: Failed to prepare device %s " | |
1046 | "for power transition: error %d\n", | |
1047 | kobject_name(&dev->kobj), error); | |
1048 | put_device(dev); | |
1049 | break; | |
1050 | } | |
1051 | dev->power.status = DPM_SUSPENDING; | |
1052 | if (!list_empty(&dev->power.entry)) | |
1053 | list_move_tail(&dev->power.entry, &list); | |
1054 | put_device(dev); | |
1055 | } | |
1056 | list_splice(&list, &dpm_list); | |
1057 | mutex_unlock(&dpm_list_mtx); | |
cd59abfc AS |
1058 | return error; |
1059 | } | |
1060 | ||
775b64d2 | 1061 | /** |
20d652d7 RW |
1062 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1063 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1064 | * |
20d652d7 RW |
1065 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1066 | * callbacks for them. | |
775b64d2 | 1067 | */ |
d1616302 | 1068 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1069 | { |
1070 | int error; | |
cd59abfc | 1071 | |
775b64d2 | 1072 | might_sleep(); |
1eede070 RW |
1073 | error = dpm_prepare(state); |
1074 | if (!error) | |
1075 | error = dpm_suspend(state); | |
cd59abfc | 1076 | return error; |
cd59abfc | 1077 | } |
d1616302 | 1078 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1079 | |
1080 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1081 | { | |
c80cfb04 BH |
1082 | if (ret) |
1083 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1084 | } |
1085 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1086 | |
1087 | /** | |
1088 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1089 | * @dev: Device to wait for. | |
1090 | * @subordinate: Device that needs to wait for @dev. | |
1091 | */ | |
098dff73 | 1092 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1093 | { |
1094 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1095 | return async_error; |
f8824cee RW |
1096 | } |
1097 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |