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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 | { |
d08a5ace | 478 | struct list_head list; |
ecf762b2 | 479 | ktime_t starttime = ktime_get(); |
775b64d2 | 480 | |
d08a5ace | 481 | INIT_LIST_HEAD(&list); |
32bdfac5 | 482 | mutex_lock(&dpm_list_mtx); |
3eb132c9 | 483 | transition_started = false; |
d08a5ace RW |
484 | while (!list_empty(&dpm_list)) { |
485 | struct device *dev = to_device(dpm_list.next); | |
486 | ||
487 | get_device(dev); | |
1eede070 RW |
488 | if (dev->power.status > DPM_OFF) { |
489 | int error; | |
775b64d2 | 490 | |
1eede070 | 491 | dev->power.status = DPM_OFF; |
d08a5ace RW |
492 | mutex_unlock(&dpm_list_mtx); |
493 | ||
d1616302 | 494 | error = device_resume_noirq(dev, state); |
d08a5ace RW |
495 | |
496 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
497 | if (error) |
498 | pm_dev_err(dev, state, " early", error); | |
499 | } | |
d08a5ace RW |
500 | if (!list_empty(&dev->power.entry)) |
501 | list_move_tail(&dev->power.entry, &list); | |
502 | put_device(dev); | |
503 | } | |
504 | list_splice(&list, &dpm_list); | |
32bdfac5 | 505 | mutex_unlock(&dpm_list_mtx); |
ecf762b2 | 506 | dpm_show_time(starttime, state, "early"); |
2ed8d2b3 | 507 | resume_device_irqs(); |
775b64d2 | 508 | } |
d1616302 | 509 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
775b64d2 | 510 | |
875ab0b7 RW |
511 | /** |
512 | * legacy_resume - Execute a legacy (bus or class) resume callback for device. | |
0a884223 RD |
513 | * @dev: Device to resume. |
514 | * @cb: Resume callback to execute. | |
875ab0b7 RW |
515 | */ |
516 | static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) | |
517 | { | |
518 | int error; | |
519 | ktime_t calltime; | |
520 | ||
521 | calltime = initcall_debug_start(dev); | |
522 | ||
523 | error = cb(dev); | |
524 | suspend_report_result(cb, error); | |
525 | ||
526 | initcall_debug_report(dev, calltime, error); | |
527 | ||
528 | return error; | |
529 | } | |
530 | ||
775b64d2 | 531 | /** |
97df8c12 | 532 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
533 | * @dev: Device to handle. |
534 | * @state: PM transition of the system being carried out. | |
5af84b82 | 535 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 536 | */ |
97df8c12 | 537 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 RW |
538 | { |
539 | int error = 0; | |
540 | ||
541 | TRACE_DEVICE(dev); | |
542 | TRACE_RESUME(0); | |
cd59abfc | 543 | |
5af84b82 | 544 | dpm_wait(dev->parent, async); |
8e9394ce | 545 | device_lock(dev); |
7a8d37a3 | 546 | |
97df8c12 RW |
547 | dev->power.status = DPM_RESUMING; |
548 | ||
1eede070 RW |
549 | if (dev->bus) { |
550 | if (dev->bus->pm) { | |
551 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 552 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
553 | } else if (dev->bus->resume) { |
554 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 555 | error = legacy_resume(dev, dev->bus->resume); |
1eede070 RW |
556 | } |
557 | if (error) | |
558 | goto End; | |
cd59abfc AS |
559 | } |
560 | ||
1eede070 RW |
561 | if (dev->type) { |
562 | if (dev->type->pm) { | |
563 | pm_dev_dbg(dev, state, "type "); | |
564 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
565 | } |
566 | if (error) | |
567 | goto End; | |
cd59abfc AS |
568 | } |
569 | ||
1eede070 RW |
570 | if (dev->class) { |
571 | if (dev->class->pm) { | |
572 | pm_dev_dbg(dev, state, "class "); | |
573 | error = pm_op(dev, dev->class->pm, state); | |
574 | } else if (dev->class->resume) { | |
575 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 576 | error = legacy_resume(dev, dev->class->resume); |
1eede070 | 577 | } |
cd59abfc | 578 | } |
1eede070 | 579 | End: |
8e9394ce | 580 | device_unlock(dev); |
5af84b82 | 581 | complete_all(&dev->power.completion); |
7a8d37a3 | 582 | |
cd59abfc AS |
583 | TRACE_RESUME(error); |
584 | return error; | |
585 | } | |
586 | ||
5af84b82 RW |
587 | static void async_resume(void *data, async_cookie_t cookie) |
588 | { | |
589 | struct device *dev = (struct device *)data; | |
590 | int error; | |
591 | ||
97df8c12 | 592 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
593 | if (error) |
594 | pm_dev_err(dev, pm_transition, " async", error); | |
595 | put_device(dev); | |
596 | } | |
597 | ||
97df8c12 | 598 | static bool is_async(struct device *dev) |
5af84b82 | 599 | { |
97df8c12 RW |
600 | return dev->power.async_suspend && pm_async_enabled |
601 | && !pm_trace_is_enabled(); | |
5af84b82 RW |
602 | } |
603 | ||
775b64d2 | 604 | /** |
20d652d7 RW |
605 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
606 | * @state: PM transition of the system being carried out. | |
775b64d2 | 607 | * |
20d652d7 RW |
608 | * Execute the appropriate "resume" callback for all devices whose status |
609 | * indicates that they are suspended. | |
1eede070 RW |
610 | */ |
611 | static void dpm_resume(pm_message_t state) | |
612 | { | |
613 | struct list_head list; | |
97df8c12 | 614 | struct device *dev; |
ecf762b2 | 615 | ktime_t starttime = ktime_get(); |
1eede070 RW |
616 | |
617 | INIT_LIST_HEAD(&list); | |
618 | mutex_lock(&dpm_list_mtx); | |
5af84b82 | 619 | pm_transition = state; |
098dff73 | 620 | async_error = 0; |
1eede070 | 621 | |
97df8c12 RW |
622 | list_for_each_entry(dev, &dpm_list, power.entry) { |
623 | if (dev->power.status < DPM_OFF) | |
624 | continue; | |
625 | ||
626 | INIT_COMPLETION(dev->power.completion); | |
627 | if (is_async(dev)) { | |
628 | get_device(dev); | |
629 | async_schedule(async_resume, dev); | |
630 | } | |
631 | } | |
632 | ||
633 | while (!list_empty(&dpm_list)) { | |
634 | dev = to_device(dpm_list.next); | |
1eede070 | 635 | get_device(dev); |
97df8c12 | 636 | if (dev->power.status >= DPM_OFF && !is_async(dev)) { |
1eede070 RW |
637 | int error; |
638 | ||
1eede070 RW |
639 | mutex_unlock(&dpm_list_mtx); |
640 | ||
97df8c12 | 641 | error = device_resume(dev, state, false); |
1eede070 RW |
642 | |
643 | mutex_lock(&dpm_list_mtx); | |
644 | if (error) | |
645 | pm_dev_err(dev, state, "", error); | |
646 | } else if (dev->power.status == DPM_SUSPENDING) { | |
647 | /* Allow new children of the device to be registered */ | |
648 | dev->power.status = DPM_RESUMING; | |
649 | } | |
650 | if (!list_empty(&dev->power.entry)) | |
651 | list_move_tail(&dev->power.entry, &list); | |
652 | put_device(dev); | |
653 | } | |
654 | list_splice(&list, &dpm_list); | |
655 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 | 656 | async_synchronize_full(); |
ecf762b2 | 657 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
658 | } |
659 | ||
660 | /** | |
20d652d7 RW |
661 | * device_complete - Complete a PM transition for given device. |
662 | * @dev: Device to handle. | |
663 | * @state: PM transition of the system being carried out. | |
1eede070 | 664 | */ |
d1616302 | 665 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 666 | { |
8e9394ce | 667 | device_lock(dev); |
1eede070 RW |
668 | |
669 | if (dev->class && dev->class->pm && dev->class->pm->complete) { | |
670 | pm_dev_dbg(dev, state, "completing class "); | |
671 | dev->class->pm->complete(dev); | |
672 | } | |
673 | ||
674 | if (dev->type && dev->type->pm && dev->type->pm->complete) { | |
675 | pm_dev_dbg(dev, state, "completing type "); | |
676 | dev->type->pm->complete(dev); | |
677 | } | |
678 | ||
adf09493 | 679 | if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { |
1eede070 | 680 | pm_dev_dbg(dev, state, "completing "); |
adf09493 | 681 | dev->bus->pm->complete(dev); |
1eede070 RW |
682 | } |
683 | ||
8e9394ce | 684 | device_unlock(dev); |
1eede070 RW |
685 | } |
686 | ||
687 | /** | |
20d652d7 RW |
688 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
689 | * @state: PM transition of the system being carried out. | |
775b64d2 | 690 | * |
20d652d7 RW |
691 | * Execute the ->complete() callbacks for all devices whose PM status is not |
692 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 693 | */ |
1eede070 | 694 | static void dpm_complete(pm_message_t state) |
cd59abfc | 695 | { |
1eede070 RW |
696 | struct list_head list; |
697 | ||
698 | INIT_LIST_HEAD(&list); | |
cd59abfc | 699 | mutex_lock(&dpm_list_mtx); |
e528e876 | 700 | transition_started = false; |
1eede070 RW |
701 | while (!list_empty(&dpm_list)) { |
702 | struct device *dev = to_device(dpm_list.prev); | |
cd59abfc | 703 | |
1eede070 RW |
704 | get_device(dev); |
705 | if (dev->power.status > DPM_ON) { | |
706 | dev->power.status = DPM_ON; | |
707 | mutex_unlock(&dpm_list_mtx); | |
708 | ||
d1616302 | 709 | device_complete(dev, state); |
aa0baaef | 710 | pm_runtime_put_sync(dev); |
1eede070 RW |
711 | |
712 | mutex_lock(&dpm_list_mtx); | |
713 | } | |
714 | if (!list_empty(&dev->power.entry)) | |
715 | list_move(&dev->power.entry, &list); | |
716 | put_device(dev); | |
cd59abfc | 717 | } |
1eede070 | 718 | list_splice(&list, &dpm_list); |
cd59abfc AS |
719 | mutex_unlock(&dpm_list_mtx); |
720 | } | |
721 | ||
cd59abfc | 722 | /** |
20d652d7 RW |
723 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
724 | * @state: PM transition of the system being carried out. | |
cd59abfc | 725 | * |
20d652d7 RW |
726 | * Execute "resume" callbacks for all devices and complete the PM transition of |
727 | * the system. | |
cd59abfc | 728 | */ |
d1616302 | 729 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 730 | { |
775b64d2 | 731 | might_sleep(); |
1eede070 RW |
732 | dpm_resume(state); |
733 | dpm_complete(state); | |
cd59abfc | 734 | } |
d1616302 | 735 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
736 | |
737 | ||
738 | /*------------------------- Suspend routines -------------------------*/ | |
739 | ||
1eede070 | 740 | /** |
20d652d7 RW |
741 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
742 | * @sleep_state: PM message representing a sleep state. | |
743 | * | |
744 | * Return a PM message representing the resume event corresponding to given | |
745 | * sleep state. | |
1eede070 RW |
746 | */ |
747 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 748 | { |
1eede070 RW |
749 | switch (sleep_state.event) { |
750 | case PM_EVENT_SUSPEND: | |
751 | return PMSG_RESUME; | |
752 | case PM_EVENT_FREEZE: | |
753 | case PM_EVENT_QUIESCE: | |
754 | return PMSG_RECOVER; | |
755 | case PM_EVENT_HIBERNATE: | |
756 | return PMSG_RESTORE; | |
cd59abfc | 757 | } |
1eede070 | 758 | return PMSG_ON; |
cd59abfc AS |
759 | } |
760 | ||
761 | /** | |
20d652d7 RW |
762 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
763 | * @dev: Device to handle. | |
764 | * @state: PM transition of the system being carried out. | |
775b64d2 | 765 | * |
20d652d7 RW |
766 | * The driver of @dev will not receive interrupts while this function is being |
767 | * executed. | |
cd59abfc | 768 | */ |
d1616302 | 769 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 RW |
770 | { |
771 | int error = 0; | |
cd59abfc | 772 | |
e7176a37 DB |
773 | if (dev->class && dev->class->pm) { |
774 | pm_dev_dbg(dev, state, "LATE class "); | |
775 | error = pm_noirq_op(dev, dev->class->pm, state); | |
776 | if (error) | |
777 | goto End; | |
778 | } | |
779 | ||
780 | if (dev->type && dev->type->pm) { | |
781 | pm_dev_dbg(dev, state, "LATE type "); | |
782 | error = pm_noirq_op(dev, dev->type->pm, state); | |
783 | if (error) | |
784 | goto End; | |
785 | } | |
786 | ||
33c33740 | 787 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
788 | pm_dev_dbg(dev, state, "LATE "); |
789 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
775b64d2 | 790 | } |
e7176a37 DB |
791 | |
792 | End: | |
775b64d2 RW |
793 | return error; |
794 | } | |
795 | ||
796 | /** | |
20d652d7 RW |
797 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
798 | * @state: PM transition of the system being carried out. | |
775b64d2 | 799 | * |
20d652d7 RW |
800 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
801 | * handlers for all non-sysdev devices. | |
775b64d2 | 802 | */ |
d1616302 | 803 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 804 | { |
d08a5ace | 805 | struct list_head list; |
ecf762b2 | 806 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
807 | int error = 0; |
808 | ||
d08a5ace | 809 | INIT_LIST_HEAD(&list); |
2ed8d2b3 | 810 | suspend_device_irqs(); |
32bdfac5 | 811 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
812 | while (!list_empty(&dpm_list)) { |
813 | struct device *dev = to_device(dpm_list.prev); | |
814 | ||
815 | get_device(dev); | |
816 | mutex_unlock(&dpm_list_mtx); | |
817 | ||
d1616302 | 818 | error = device_suspend_noirq(dev, state); |
d08a5ace RW |
819 | |
820 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 821 | if (error) { |
1eede070 | 822 | pm_dev_err(dev, state, " late", error); |
d08a5ace | 823 | put_device(dev); |
775b64d2 RW |
824 | break; |
825 | } | |
1eede070 | 826 | dev->power.status = DPM_OFF_IRQ; |
d08a5ace RW |
827 | if (!list_empty(&dev->power.entry)) |
828 | list_move(&dev->power.entry, &list); | |
829 | put_device(dev); | |
775b64d2 | 830 | } |
d08a5ace | 831 | list_splice_tail(&list, &dpm_list); |
32bdfac5 | 832 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 833 | if (error) |
d1616302 | 834 | dpm_resume_noirq(resume_event(state)); |
ecf762b2 RW |
835 | else |
836 | dpm_show_time(starttime, state, "late"); | |
775b64d2 RW |
837 | return error; |
838 | } | |
d1616302 | 839 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
775b64d2 | 840 | |
875ab0b7 RW |
841 | /** |
842 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
843 | * @dev: Device to suspend. |
844 | * @state: PM transition of the system being carried out. | |
845 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
846 | */ |
847 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
848 | int (*cb)(struct device *dev, pm_message_t state)) | |
849 | { | |
850 | int error; | |
851 | ktime_t calltime; | |
852 | ||
853 | calltime = initcall_debug_start(dev); | |
854 | ||
855 | error = cb(dev, state); | |
856 | suspend_report_result(cb, error); | |
857 | ||
858 | initcall_debug_report(dev, calltime, error); | |
859 | ||
860 | return error; | |
861 | } | |
862 | ||
775b64d2 | 863 | /** |
20d652d7 RW |
864 | * device_suspend - Execute "suspend" callbacks for given device. |
865 | * @dev: Device to handle. | |
866 | * @state: PM transition of the system being carried out. | |
5af84b82 | 867 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 868 | */ |
5af84b82 | 869 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc AS |
870 | { |
871 | int error = 0; | |
872 | ||
5af84b82 | 873 | dpm_wait_for_children(dev, async); |
8e9394ce | 874 | device_lock(dev); |
7a8d37a3 | 875 | |
5af84b82 RW |
876 | if (async_error) |
877 | goto End; | |
878 | ||
1eede070 RW |
879 | if (dev->class) { |
880 | if (dev->class->pm) { | |
881 | pm_dev_dbg(dev, state, "class "); | |
882 | error = pm_op(dev, dev->class->pm, state); | |
883 | } else if (dev->class->suspend) { | |
884 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 885 | error = legacy_suspend(dev, state, dev->class->suspend); |
1eede070 RW |
886 | } |
887 | if (error) | |
888 | goto End; | |
cd59abfc AS |
889 | } |
890 | ||
1eede070 RW |
891 | if (dev->type) { |
892 | if (dev->type->pm) { | |
893 | pm_dev_dbg(dev, state, "type "); | |
894 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
895 | } |
896 | if (error) | |
897 | goto End; | |
cd59abfc AS |
898 | } |
899 | ||
1eede070 RW |
900 | if (dev->bus) { |
901 | if (dev->bus->pm) { | |
902 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 903 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
904 | } else if (dev->bus->suspend) { |
905 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 906 | error = legacy_suspend(dev, state, dev->bus->suspend); |
1eede070 | 907 | } |
cd59abfc | 908 | } |
5af84b82 RW |
909 | |
910 | if (!error) | |
911 | dev->power.status = DPM_OFF; | |
912 | ||
1eede070 | 913 | End: |
8e9394ce | 914 | device_unlock(dev); |
5af84b82 | 915 | complete_all(&dev->power.completion); |
7a8d37a3 | 916 | |
098dff73 RW |
917 | if (error) |
918 | async_error = error; | |
919 | ||
cd59abfc AS |
920 | return error; |
921 | } | |
922 | ||
5af84b82 RW |
923 | static void async_suspend(void *data, async_cookie_t cookie) |
924 | { | |
925 | struct device *dev = (struct device *)data; | |
926 | int error; | |
927 | ||
928 | error = __device_suspend(dev, pm_transition, true); | |
098dff73 | 929 | if (error) |
5af84b82 | 930 | pm_dev_err(dev, pm_transition, " async", error); |
5af84b82 RW |
931 | |
932 | put_device(dev); | |
933 | } | |
934 | ||
935 | static int device_suspend(struct device *dev) | |
936 | { | |
937 | INIT_COMPLETION(dev->power.completion); | |
938 | ||
0e06b4a8 | 939 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
940 | get_device(dev); |
941 | async_schedule(async_suspend, dev); | |
942 | return 0; | |
943 | } | |
944 | ||
945 | return __device_suspend(dev, pm_transition, false); | |
946 | } | |
947 | ||
cd59abfc | 948 | /** |
20d652d7 RW |
949 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
950 | * @state: PM transition of the system being carried out. | |
cd59abfc | 951 | */ |
775b64d2 | 952 | static int dpm_suspend(pm_message_t state) |
cd59abfc | 953 | { |
1eede070 | 954 | struct list_head list; |
ecf762b2 | 955 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
956 | int error = 0; |
957 | ||
1eede070 | 958 | INIT_LIST_HEAD(&list); |
cd59abfc | 959 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
960 | pm_transition = state; |
961 | async_error = 0; | |
1eede070 RW |
962 | while (!list_empty(&dpm_list)) { |
963 | struct device *dev = to_device(dpm_list.prev); | |
58aca232 | 964 | |
1eede070 | 965 | get_device(dev); |
cd59abfc | 966 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 967 | |
5af84b82 | 968 | error = device_suspend(dev); |
1eede070 | 969 | |
1b3cbec1 | 970 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 971 | if (error) { |
1eede070 RW |
972 | pm_dev_err(dev, state, "", error); |
973 | put_device(dev); | |
775b64d2 RW |
974 | break; |
975 | } | |
7a8d37a3 | 976 | if (!list_empty(&dev->power.entry)) |
1eede070 RW |
977 | list_move(&dev->power.entry, &list); |
978 | put_device(dev); | |
5af84b82 RW |
979 | if (async_error) |
980 | break; | |
cd59abfc | 981 | } |
1eede070 | 982 | list_splice(&list, dpm_list.prev); |
cd59abfc | 983 | mutex_unlock(&dpm_list_mtx); |
5af84b82 RW |
984 | async_synchronize_full(); |
985 | if (!error) | |
986 | error = async_error; | |
ecf762b2 RW |
987 | if (!error) |
988 | dpm_show_time(starttime, state, NULL); | |
1eede070 RW |
989 | return error; |
990 | } | |
991 | ||
992 | /** | |
20d652d7 RW |
993 | * device_prepare - Prepare a device for system power transition. |
994 | * @dev: Device to handle. | |
995 | * @state: PM transition of the system being carried out. | |
996 | * | |
997 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
998 | * device may be registered after this function has returned. | |
1eede070 | 999 | */ |
d1616302 | 1000 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 RW |
1001 | { |
1002 | int error = 0; | |
1003 | ||
8e9394ce | 1004 | device_lock(dev); |
1eede070 | 1005 | |
adf09493 | 1006 | if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { |
1eede070 | 1007 | pm_dev_dbg(dev, state, "preparing "); |
adf09493 RW |
1008 | error = dev->bus->pm->prepare(dev); |
1009 | suspend_report_result(dev->bus->pm->prepare, error); | |
1eede070 RW |
1010 | if (error) |
1011 | goto End; | |
1012 | } | |
1013 | ||
1014 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { | |
1015 | pm_dev_dbg(dev, state, "preparing type "); | |
1016 | error = dev->type->pm->prepare(dev); | |
1017 | suspend_report_result(dev->type->pm->prepare, error); | |
1018 | if (error) | |
1019 | goto End; | |
1020 | } | |
1021 | ||
1022 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { | |
1023 | pm_dev_dbg(dev, state, "preparing class "); | |
1024 | error = dev->class->pm->prepare(dev); | |
1025 | suspend_report_result(dev->class->pm->prepare, error); | |
1026 | } | |
1027 | End: | |
8e9394ce | 1028 | device_unlock(dev); |
1eede070 RW |
1029 | |
1030 | return error; | |
1031 | } | |
cd59abfc | 1032 | |
1eede070 | 1033 | /** |
20d652d7 RW |
1034 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1035 | * @state: PM transition of the system being carried out. | |
1eede070 | 1036 | * |
20d652d7 | 1037 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 RW |
1038 | */ |
1039 | static int dpm_prepare(pm_message_t state) | |
1040 | { | |
1041 | struct list_head list; | |
1042 | int error = 0; | |
1043 | ||
1044 | INIT_LIST_HEAD(&list); | |
1045 | mutex_lock(&dpm_list_mtx); | |
1046 | transition_started = true; | |
1047 | while (!list_empty(&dpm_list)) { | |
1048 | struct device *dev = to_device(dpm_list.next); | |
1049 | ||
1050 | get_device(dev); | |
1051 | dev->power.status = DPM_PREPARING; | |
1052 | mutex_unlock(&dpm_list_mtx); | |
1053 | ||
5e928f77 RW |
1054 | pm_runtime_get_noresume(dev); |
1055 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) { | |
1056 | /* Wake-up requested during system sleep transition. */ | |
aa0baaef | 1057 | pm_runtime_put_sync(dev); |
5e928f77 RW |
1058 | error = -EBUSY; |
1059 | } else { | |
1060 | error = device_prepare(dev, state); | |
1061 | } | |
1eede070 RW |
1062 | |
1063 | mutex_lock(&dpm_list_mtx); | |
1064 | if (error) { | |
1065 | dev->power.status = DPM_ON; | |
1066 | if (error == -EAGAIN) { | |
1067 | put_device(dev); | |
886a7a33 | 1068 | error = 0; |
1eede070 RW |
1069 | continue; |
1070 | } | |
1071 | printk(KERN_ERR "PM: Failed to prepare device %s " | |
1072 | "for power transition: error %d\n", | |
1073 | kobject_name(&dev->kobj), error); | |
1074 | put_device(dev); | |
1075 | break; | |
1076 | } | |
1077 | dev->power.status = DPM_SUSPENDING; | |
1078 | if (!list_empty(&dev->power.entry)) | |
1079 | list_move_tail(&dev->power.entry, &list); | |
1080 | put_device(dev); | |
1081 | } | |
1082 | list_splice(&list, &dpm_list); | |
1083 | mutex_unlock(&dpm_list_mtx); | |
cd59abfc AS |
1084 | return error; |
1085 | } | |
1086 | ||
775b64d2 | 1087 | /** |
20d652d7 RW |
1088 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1089 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1090 | * |
20d652d7 RW |
1091 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1092 | * callbacks for them. | |
775b64d2 | 1093 | */ |
d1616302 | 1094 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1095 | { |
1096 | int error; | |
cd59abfc | 1097 | |
775b64d2 | 1098 | might_sleep(); |
1eede070 RW |
1099 | error = dpm_prepare(state); |
1100 | if (!error) | |
1101 | error = dpm_suspend(state); | |
cd59abfc | 1102 | return error; |
cd59abfc | 1103 | } |
d1616302 | 1104 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1105 | |
1106 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1107 | { | |
c80cfb04 BH |
1108 | if (ret) |
1109 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1110 | } |
1111 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1112 | |
1113 | /** | |
1114 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1115 | * @dev: Device to wait for. | |
1116 | * @subordinate: Device that needs to wait for @dev. | |
1117 | */ | |
098dff73 | 1118 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1119 | { |
1120 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1121 | return async_error; |
f8824cee RW |
1122 | } |
1123 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |