Commit | Line | Data |
---|---|---|
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> |
1e75227e | 29 | #include <linux/suspend.h> |
11048dcf | 30 | |
cd59abfc | 31 | #include "../base.h" |
1da177e4 LT |
32 | #include "power.h" |
33 | ||
775b64d2 | 34 | /* |
1eede070 | 35 | * The entries in the dpm_list list are in a depth first order, simply |
775b64d2 RW |
36 | * because children are guaranteed to be discovered after parents, and |
37 | * are inserted at the back of the list on discovery. | |
38 | * | |
8e9394ce GKH |
39 | * Since device_pm_add() may be called with a device lock held, |
40 | * we must never try to acquire a device lock while holding | |
775b64d2 RW |
41 | * dpm_list_mutex. |
42 | */ | |
43 | ||
1eede070 | 44 | LIST_HEAD(dpm_list); |
8a43a9ab RW |
45 | LIST_HEAD(dpm_prepared_list); |
46 | LIST_HEAD(dpm_suspended_list); | |
47 | LIST_HEAD(dpm_noirq_list); | |
1da177e4 | 48 | |
cd59abfc | 49 | static DEFINE_MUTEX(dpm_list_mtx); |
5af84b82 | 50 | static pm_message_t pm_transition; |
1da177e4 | 51 | |
1eede070 RW |
52 | /* |
53 | * Set once the preparation of devices for a PM transition has started, reset | |
54 | * before starting to resume devices. Protected by dpm_list_mtx. | |
55 | */ | |
56 | static bool transition_started; | |
57 | ||
098dff73 RW |
58 | static int async_error; |
59 | ||
5e928f77 | 60 | /** |
20d652d7 | 61 | * device_pm_init - Initialize the PM-related part of a device object. |
5e928f77 RW |
62 | * @dev: Device object being initialized. |
63 | */ | |
64 | void device_pm_init(struct device *dev) | |
65 | { | |
66 | dev->power.status = DPM_ON; | |
5af84b82 | 67 | init_completion(&dev->power.completion); |
152e1d59 | 68 | complete_all(&dev->power.completion); |
074037ec RW |
69 | dev->power.wakeup = NULL; |
70 | spin_lock_init(&dev->power.lock); | |
5e928f77 RW |
71 | pm_runtime_init(dev); |
72 | } | |
73 | ||
1eede070 | 74 | /** |
20d652d7 | 75 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
76 | */ |
77 | void device_pm_lock(void) | |
78 | { | |
79 | mutex_lock(&dpm_list_mtx); | |
80 | } | |
81 | ||
82 | /** | |
20d652d7 | 83 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
84 | */ |
85 | void device_pm_unlock(void) | |
86 | { | |
87 | mutex_unlock(&dpm_list_mtx); | |
88 | } | |
075c1771 | 89 | |
775b64d2 | 90 | /** |
20d652d7 RW |
91 | * device_pm_add - Add a device to the PM core's list of active devices. |
92 | * @dev: Device to add to the list. | |
775b64d2 | 93 | */ |
3b98aeaf | 94 | void device_pm_add(struct device *dev) |
1da177e4 | 95 | { |
1da177e4 | 96 | pr_debug("PM: Adding info for %s:%s\n", |
c48ea603 DT |
97 | dev->bus ? dev->bus->name : "No Bus", |
98 | kobject_name(&dev->kobj)); | |
11048dcf | 99 | mutex_lock(&dpm_list_mtx); |
1eede070 | 100 | if (dev->parent) { |
f5a6d958 RW |
101 | if (dev->parent->power.status >= DPM_SUSPENDING) |
102 | dev_warn(dev, "parent %s should not be sleeping\n", | |
1e0b2cf9 | 103 | dev_name(dev->parent)); |
1eede070 RW |
104 | } else if (transition_started) { |
105 | /* | |
106 | * We refuse to register parentless devices while a PM | |
107 | * transition is in progress in order to avoid leaving them | |
108 | * unhandled down the road | |
109 | */ | |
728f0893 | 110 | dev_WARN(dev, "Parentless device registered during a PM transaction\n"); |
58aca232 | 111 | } |
3b98aeaf AS |
112 | |
113 | list_add_tail(&dev->power.entry, &dpm_list); | |
11048dcf | 114 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
115 | } |
116 | ||
775b64d2 | 117 | /** |
20d652d7 RW |
118 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
119 | * @dev: Device to be removed from the list. | |
775b64d2 | 120 | */ |
9cddad77 | 121 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
122 | { |
123 | pr_debug("PM: Removing info for %s:%s\n", | |
c48ea603 DT |
124 | dev->bus ? dev->bus->name : "No Bus", |
125 | kobject_name(&dev->kobj)); | |
5af84b82 | 126 | complete_all(&dev->power.completion); |
11048dcf | 127 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 128 | list_del_init(&dev->power.entry); |
11048dcf | 129 | mutex_unlock(&dpm_list_mtx); |
074037ec | 130 | device_wakeup_disable(dev); |
5e928f77 | 131 | pm_runtime_remove(dev); |
775b64d2 RW |
132 | } |
133 | ||
ffa6a705 | 134 | /** |
20d652d7 RW |
135 | * device_pm_move_before - Move device in the PM core's list of active devices. |
136 | * @deva: Device to move in dpm_list. | |
137 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
138 | */ |
139 | void device_pm_move_before(struct device *deva, struct device *devb) | |
140 | { | |
141 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
142 | deva->bus ? deva->bus->name : "No Bus", | |
143 | kobject_name(&deva->kobj), | |
144 | devb->bus ? devb->bus->name : "No Bus", | |
145 | kobject_name(&devb->kobj)); | |
146 | /* Delete deva from dpm_list and reinsert before devb. */ | |
147 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
148 | } | |
149 | ||
150 | /** | |
20d652d7 RW |
151 | * device_pm_move_after - Move device in the PM core's list of active devices. |
152 | * @deva: Device to move in dpm_list. | |
153 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
154 | */ |
155 | void device_pm_move_after(struct device *deva, struct device *devb) | |
156 | { | |
157 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
158 | deva->bus ? deva->bus->name : "No Bus", | |
159 | kobject_name(&deva->kobj), | |
160 | devb->bus ? devb->bus->name : "No Bus", | |
161 | kobject_name(&devb->kobj)); | |
162 | /* Delete deva from dpm_list and reinsert after devb. */ | |
163 | list_move(&deva->power.entry, &devb->power.entry); | |
164 | } | |
165 | ||
166 | /** | |
20d652d7 RW |
167 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
168 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
169 | */ |
170 | void device_pm_move_last(struct device *dev) | |
171 | { | |
172 | pr_debug("PM: Moving %s:%s to end of list\n", | |
173 | dev->bus ? dev->bus->name : "No Bus", | |
174 | kobject_name(&dev->kobj)); | |
175 | list_move_tail(&dev->power.entry, &dpm_list); | |
176 | } | |
177 | ||
875ab0b7 RW |
178 | static ktime_t initcall_debug_start(struct device *dev) |
179 | { | |
180 | ktime_t calltime = ktime_set(0, 0); | |
181 | ||
182 | if (initcall_debug) { | |
183 | pr_info("calling %s+ @ %i\n", | |
184 | dev_name(dev), task_pid_nr(current)); | |
185 | calltime = ktime_get(); | |
186 | } | |
187 | ||
188 | return calltime; | |
189 | } | |
190 | ||
191 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
192 | int error) | |
193 | { | |
194 | ktime_t delta, rettime; | |
195 | ||
196 | if (initcall_debug) { | |
197 | rettime = ktime_get(); | |
198 | delta = ktime_sub(rettime, calltime); | |
199 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), | |
200 | error, (unsigned long long)ktime_to_ns(delta) >> 10); | |
201 | } | |
202 | } | |
203 | ||
5af84b82 RW |
204 | /** |
205 | * dpm_wait - Wait for a PM operation to complete. | |
206 | * @dev: Device to wait for. | |
207 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
208 | */ | |
209 | static void dpm_wait(struct device *dev, bool async) | |
210 | { | |
211 | if (!dev) | |
212 | return; | |
213 | ||
0e06b4a8 | 214 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
215 | wait_for_completion(&dev->power.completion); |
216 | } | |
217 | ||
218 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
219 | { | |
220 | dpm_wait(dev, *((bool *)async_ptr)); | |
221 | return 0; | |
222 | } | |
223 | ||
224 | static void dpm_wait_for_children(struct device *dev, bool async) | |
225 | { | |
226 | device_for_each_child(dev, &async, dpm_wait_fn); | |
227 | } | |
228 | ||
1eede070 | 229 | /** |
20d652d7 RW |
230 | * pm_op - Execute the PM operation appropriate for given PM event. |
231 | * @dev: Device to handle. | |
232 | * @ops: PM operations to choose from. | |
233 | * @state: PM transition of the system being carried out. | |
1eede070 | 234 | */ |
d9ab7716 DT |
235 | static int pm_op(struct device *dev, |
236 | const struct dev_pm_ops *ops, | |
237 | pm_message_t state) | |
1eede070 RW |
238 | { |
239 | int error = 0; | |
875ab0b7 | 240 | ktime_t calltime; |
f2511774 | 241 | |
875ab0b7 | 242 | calltime = initcall_debug_start(dev); |
1eede070 RW |
243 | |
244 | switch (state.event) { | |
245 | #ifdef CONFIG_SUSPEND | |
246 | case PM_EVENT_SUSPEND: | |
247 | if (ops->suspend) { | |
248 | error = ops->suspend(dev); | |
249 | suspend_report_result(ops->suspend, error); | |
250 | } | |
251 | break; | |
252 | case PM_EVENT_RESUME: | |
253 | if (ops->resume) { | |
254 | error = ops->resume(dev); | |
255 | suspend_report_result(ops->resume, error); | |
256 | } | |
257 | break; | |
258 | #endif /* CONFIG_SUSPEND */ | |
259 | #ifdef CONFIG_HIBERNATION | |
260 | case PM_EVENT_FREEZE: | |
261 | case PM_EVENT_QUIESCE: | |
262 | if (ops->freeze) { | |
263 | error = ops->freeze(dev); | |
264 | suspend_report_result(ops->freeze, error); | |
265 | } | |
266 | break; | |
267 | case PM_EVENT_HIBERNATE: | |
268 | if (ops->poweroff) { | |
269 | error = ops->poweroff(dev); | |
270 | suspend_report_result(ops->poweroff, error); | |
271 | } | |
272 | break; | |
273 | case PM_EVENT_THAW: | |
274 | case PM_EVENT_RECOVER: | |
275 | if (ops->thaw) { | |
276 | error = ops->thaw(dev); | |
277 | suspend_report_result(ops->thaw, error); | |
278 | } | |
279 | break; | |
280 | case PM_EVENT_RESTORE: | |
281 | if (ops->restore) { | |
282 | error = ops->restore(dev); | |
283 | suspend_report_result(ops->restore, error); | |
284 | } | |
285 | break; | |
286 | #endif /* CONFIG_HIBERNATION */ | |
287 | default: | |
288 | error = -EINVAL; | |
289 | } | |
f2511774 | 290 | |
875ab0b7 | 291 | initcall_debug_report(dev, calltime, error); |
f2511774 | 292 | |
1eede070 RW |
293 | return error; |
294 | } | |
295 | ||
296 | /** | |
20d652d7 RW |
297 | * pm_noirq_op - Execute the PM operation appropriate for given PM event. |
298 | * @dev: Device to handle. | |
299 | * @ops: PM operations to choose from. | |
300 | * @state: PM transition of the system being carried out. | |
1eede070 | 301 | * |
20d652d7 RW |
302 | * The driver of @dev will not receive interrupts while this function is being |
303 | * executed. | |
1eede070 | 304 | */ |
d9ab7716 DT |
305 | static int pm_noirq_op(struct device *dev, |
306 | const struct dev_pm_ops *ops, | |
1eede070 RW |
307 | pm_message_t state) |
308 | { | |
309 | int error = 0; | |
2cbb3ce1 | 310 | ktime_t calltime = ktime_set(0, 0), delta, rettime; |
f2511774 AV |
311 | |
312 | if (initcall_debug) { | |
8cc6b39f RW |
313 | pr_info("calling %s+ @ %i, parent: %s\n", |
314 | dev_name(dev), task_pid_nr(current), | |
315 | dev->parent ? dev_name(dev->parent) : "none"); | |
f2511774 AV |
316 | calltime = ktime_get(); |
317 | } | |
1eede070 RW |
318 | |
319 | switch (state.event) { | |
320 | #ifdef CONFIG_SUSPEND | |
321 | case PM_EVENT_SUSPEND: | |
322 | if (ops->suspend_noirq) { | |
323 | error = ops->suspend_noirq(dev); | |
324 | suspend_report_result(ops->suspend_noirq, error); | |
325 | } | |
326 | break; | |
327 | case PM_EVENT_RESUME: | |
328 | if (ops->resume_noirq) { | |
329 | error = ops->resume_noirq(dev); | |
330 | suspend_report_result(ops->resume_noirq, error); | |
331 | } | |
332 | break; | |
333 | #endif /* CONFIG_SUSPEND */ | |
334 | #ifdef CONFIG_HIBERNATION | |
335 | case PM_EVENT_FREEZE: | |
336 | case PM_EVENT_QUIESCE: | |
337 | if (ops->freeze_noirq) { | |
338 | error = ops->freeze_noirq(dev); | |
339 | suspend_report_result(ops->freeze_noirq, error); | |
340 | } | |
341 | break; | |
342 | case PM_EVENT_HIBERNATE: | |
343 | if (ops->poweroff_noirq) { | |
344 | error = ops->poweroff_noirq(dev); | |
345 | suspend_report_result(ops->poweroff_noirq, error); | |
346 | } | |
347 | break; | |
348 | case PM_EVENT_THAW: | |
349 | case PM_EVENT_RECOVER: | |
350 | if (ops->thaw_noirq) { | |
351 | error = ops->thaw_noirq(dev); | |
352 | suspend_report_result(ops->thaw_noirq, error); | |
353 | } | |
354 | break; | |
355 | case PM_EVENT_RESTORE: | |
356 | if (ops->restore_noirq) { | |
357 | error = ops->restore_noirq(dev); | |
358 | suspend_report_result(ops->restore_noirq, error); | |
359 | } | |
360 | break; | |
361 | #endif /* CONFIG_HIBERNATION */ | |
362 | default: | |
363 | error = -EINVAL; | |
364 | } | |
f2511774 AV |
365 | |
366 | if (initcall_debug) { | |
367 | rettime = ktime_get(); | |
368 | delta = ktime_sub(rettime, calltime); | |
875ab0b7 RW |
369 | printk("initcall %s_i+ returned %d after %Ld usecs\n", |
370 | dev_name(dev), error, | |
371 | (unsigned long long)ktime_to_ns(delta) >> 10); | |
f2511774 AV |
372 | } |
373 | ||
1eede070 RW |
374 | return error; |
375 | } | |
376 | ||
377 | static char *pm_verb(int event) | |
378 | { | |
379 | switch (event) { | |
380 | case PM_EVENT_SUSPEND: | |
381 | return "suspend"; | |
382 | case PM_EVENT_RESUME: | |
383 | return "resume"; | |
384 | case PM_EVENT_FREEZE: | |
385 | return "freeze"; | |
386 | case PM_EVENT_QUIESCE: | |
387 | return "quiesce"; | |
388 | case PM_EVENT_HIBERNATE: | |
389 | return "hibernate"; | |
390 | case PM_EVENT_THAW: | |
391 | return "thaw"; | |
392 | case PM_EVENT_RESTORE: | |
393 | return "restore"; | |
394 | case PM_EVENT_RECOVER: | |
395 | return "recover"; | |
396 | default: | |
397 | return "(unknown PM event)"; | |
398 | } | |
399 | } | |
400 | ||
401 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) | |
402 | { | |
403 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
404 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
405 | ", may wakeup" : ""); | |
406 | } | |
407 | ||
408 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
409 | int error) | |
410 | { | |
411 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
412 | kobject_name(&dev->kobj), pm_verb(state.event), info, error); | |
413 | } | |
414 | ||
ecf762b2 RW |
415 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
416 | { | |
417 | ktime_t calltime; | |
0702d9ee | 418 | u64 usecs64; |
ecf762b2 RW |
419 | int usecs; |
420 | ||
421 | calltime = ktime_get(); | |
422 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
423 | do_div(usecs64, NSEC_PER_USEC); | |
424 | usecs = usecs64; | |
425 | if (usecs == 0) | |
426 | usecs = 1; | |
427 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
428 | info ?: "", info ? " " : "", pm_verb(state.event), | |
429 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
430 | } | |
431 | ||
cd59abfc AS |
432 | /*------------------------- Resume routines -------------------------*/ |
433 | ||
434 | /** | |
20d652d7 RW |
435 | * device_resume_noirq - Execute an "early resume" callback for given device. |
436 | * @dev: Device to handle. | |
437 | * @state: PM transition of the system being carried out. | |
cd59abfc | 438 | * |
20d652d7 RW |
439 | * The driver of @dev will not receive interrupts while this function is being |
440 | * executed. | |
cd59abfc | 441 | */ |
d1616302 | 442 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
cd59abfc AS |
443 | { |
444 | int error = 0; | |
445 | ||
446 | TRACE_DEVICE(dev); | |
447 | TRACE_RESUME(0); | |
448 | ||
33c33740 | 449 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
450 | pm_dev_dbg(dev, state, "EARLY "); |
451 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
e7176a37 DB |
452 | if (error) |
453 | goto End; | |
775b64d2 | 454 | } |
33c33740 | 455 | |
e7176a37 DB |
456 | if (dev->type && dev->type->pm) { |
457 | pm_dev_dbg(dev, state, "EARLY type "); | |
458 | error = pm_noirq_op(dev, dev->type->pm, state); | |
459 | if (error) | |
460 | goto End; | |
461 | } | |
462 | ||
463 | if (dev->class && dev->class->pm) { | |
464 | pm_dev_dbg(dev, state, "EARLY class "); | |
465 | error = pm_noirq_op(dev, dev->class->pm, state); | |
466 | } | |
467 | ||
468 | End: | |
775b64d2 RW |
469 | TRACE_RESUME(error); |
470 | return error; | |
471 | } | |
472 | ||
473 | /** | |
20d652d7 RW |
474 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
475 | * @state: PM transition of the system being carried out. | |
775b64d2 | 476 | * |
20d652d7 RW |
477 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
478 | * enable device drivers to receive interrupts. | |
775b64d2 | 479 | */ |
d1616302 | 480 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 481 | { |
ecf762b2 | 482 | ktime_t starttime = ktime_get(); |
775b64d2 | 483 | |
32bdfac5 | 484 | mutex_lock(&dpm_list_mtx); |
3eb132c9 | 485 | transition_started = false; |
8a43a9ab RW |
486 | while (!list_empty(&dpm_noirq_list)) { |
487 | struct device *dev = to_device(dpm_noirq_list.next); | |
d08a5ace RW |
488 | |
489 | get_device(dev); | |
1eede070 RW |
490 | if (dev->power.status > DPM_OFF) { |
491 | int error; | |
775b64d2 | 492 | |
1eede070 | 493 | dev->power.status = DPM_OFF; |
d08a5ace RW |
494 | mutex_unlock(&dpm_list_mtx); |
495 | ||
d1616302 | 496 | error = device_resume_noirq(dev, state); |
d08a5ace RW |
497 | |
498 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
499 | if (error) |
500 | pm_dev_err(dev, state, " early", error); | |
501 | } | |
d08a5ace | 502 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 503 | list_move_tail(&dev->power.entry, &dpm_suspended_list); |
d08a5ace RW |
504 | put_device(dev); |
505 | } | |
32bdfac5 | 506 | mutex_unlock(&dpm_list_mtx); |
ecf762b2 | 507 | dpm_show_time(starttime, state, "early"); |
2ed8d2b3 | 508 | resume_device_irqs(); |
775b64d2 | 509 | } |
d1616302 | 510 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
775b64d2 | 511 | |
875ab0b7 RW |
512 | /** |
513 | * legacy_resume - Execute a legacy (bus or class) resume callback for device. | |
0a884223 RD |
514 | * @dev: Device to resume. |
515 | * @cb: Resume callback to execute. | |
875ab0b7 RW |
516 | */ |
517 | static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) | |
518 | { | |
519 | int error; | |
520 | ktime_t calltime; | |
521 | ||
522 | calltime = initcall_debug_start(dev); | |
523 | ||
524 | error = cb(dev); | |
525 | suspend_report_result(cb, error); | |
526 | ||
527 | initcall_debug_report(dev, calltime, error); | |
528 | ||
529 | return error; | |
530 | } | |
531 | ||
775b64d2 | 532 | /** |
97df8c12 | 533 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
534 | * @dev: Device to handle. |
535 | * @state: PM transition of the system being carried out. | |
5af84b82 | 536 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 537 | */ |
97df8c12 | 538 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 RW |
539 | { |
540 | int error = 0; | |
541 | ||
542 | TRACE_DEVICE(dev); | |
543 | TRACE_RESUME(0); | |
cd59abfc | 544 | |
5af84b82 | 545 | dpm_wait(dev->parent, async); |
8e9394ce | 546 | device_lock(dev); |
7a8d37a3 | 547 | |
97df8c12 RW |
548 | dev->power.status = DPM_RESUMING; |
549 | ||
1eede070 RW |
550 | if (dev->bus) { |
551 | if (dev->bus->pm) { | |
552 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 553 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
554 | } else if (dev->bus->resume) { |
555 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 556 | error = legacy_resume(dev, dev->bus->resume); |
1eede070 RW |
557 | } |
558 | if (error) | |
559 | goto End; | |
cd59abfc AS |
560 | } |
561 | ||
1eede070 RW |
562 | if (dev->type) { |
563 | if (dev->type->pm) { | |
564 | pm_dev_dbg(dev, state, "type "); | |
565 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
566 | } |
567 | if (error) | |
568 | goto End; | |
cd59abfc AS |
569 | } |
570 | ||
1eede070 RW |
571 | if (dev->class) { |
572 | if (dev->class->pm) { | |
573 | pm_dev_dbg(dev, state, "class "); | |
574 | error = pm_op(dev, dev->class->pm, state); | |
575 | } else if (dev->class->resume) { | |
576 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 577 | error = legacy_resume(dev, dev->class->resume); |
1eede070 | 578 | } |
cd59abfc | 579 | } |
1eede070 | 580 | End: |
8e9394ce | 581 | device_unlock(dev); |
5af84b82 | 582 | complete_all(&dev->power.completion); |
7a8d37a3 | 583 | |
cd59abfc AS |
584 | TRACE_RESUME(error); |
585 | return error; | |
586 | } | |
587 | ||
5af84b82 RW |
588 | static void async_resume(void *data, async_cookie_t cookie) |
589 | { | |
590 | struct device *dev = (struct device *)data; | |
591 | int error; | |
592 | ||
97df8c12 | 593 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
594 | if (error) |
595 | pm_dev_err(dev, pm_transition, " async", error); | |
596 | put_device(dev); | |
597 | } | |
598 | ||
97df8c12 | 599 | static bool is_async(struct device *dev) |
5af84b82 | 600 | { |
97df8c12 RW |
601 | return dev->power.async_suspend && pm_async_enabled |
602 | && !pm_trace_is_enabled(); | |
5af84b82 RW |
603 | } |
604 | ||
775b64d2 | 605 | /** |
20d652d7 RW |
606 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
607 | * @state: PM transition of the system being carried out. | |
775b64d2 | 608 | * |
20d652d7 RW |
609 | * Execute the appropriate "resume" callback for all devices whose status |
610 | * indicates that they are suspended. | |
1eede070 RW |
611 | */ |
612 | static void dpm_resume(pm_message_t state) | |
613 | { | |
97df8c12 | 614 | struct device *dev; |
ecf762b2 | 615 | ktime_t starttime = ktime_get(); |
1eede070 | 616 | |
1eede070 | 617 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 618 | pm_transition = state; |
098dff73 | 619 | async_error = 0; |
1eede070 | 620 | |
8a43a9ab | 621 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
97df8c12 RW |
622 | if (dev->power.status < DPM_OFF) |
623 | continue; | |
624 | ||
625 | INIT_COMPLETION(dev->power.completion); | |
626 | if (is_async(dev)) { | |
627 | get_device(dev); | |
628 | async_schedule(async_resume, dev); | |
629 | } | |
630 | } | |
631 | ||
8a43a9ab RW |
632 | while (!list_empty(&dpm_suspended_list)) { |
633 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 634 | get_device(dev); |
97df8c12 | 635 | if (dev->power.status >= DPM_OFF && !is_async(dev)) { |
1eede070 RW |
636 | int error; |
637 | ||
1eede070 RW |
638 | mutex_unlock(&dpm_list_mtx); |
639 | ||
97df8c12 | 640 | error = device_resume(dev, state, false); |
1eede070 RW |
641 | |
642 | mutex_lock(&dpm_list_mtx); | |
643 | if (error) | |
644 | pm_dev_err(dev, state, "", error); | |
1eede070 RW |
645 | } |
646 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 647 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
648 | put_device(dev); |
649 | } | |
1eede070 | 650 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 651 | async_synchronize_full(); |
ecf762b2 | 652 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
653 | } |
654 | ||
655 | /** | |
20d652d7 RW |
656 | * device_complete - Complete a PM transition for given device. |
657 | * @dev: Device to handle. | |
658 | * @state: PM transition of the system being carried out. | |
1eede070 | 659 | */ |
d1616302 | 660 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 661 | { |
8e9394ce | 662 | device_lock(dev); |
1eede070 RW |
663 | |
664 | if (dev->class && dev->class->pm && dev->class->pm->complete) { | |
665 | pm_dev_dbg(dev, state, "completing class "); | |
666 | dev->class->pm->complete(dev); | |
667 | } | |
668 | ||
669 | if (dev->type && dev->type->pm && dev->type->pm->complete) { | |
670 | pm_dev_dbg(dev, state, "completing type "); | |
671 | dev->type->pm->complete(dev); | |
672 | } | |
673 | ||
adf09493 | 674 | if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { |
1eede070 | 675 | pm_dev_dbg(dev, state, "completing "); |
adf09493 | 676 | dev->bus->pm->complete(dev); |
1eede070 RW |
677 | } |
678 | ||
8e9394ce | 679 | device_unlock(dev); |
1eede070 RW |
680 | } |
681 | ||
682 | /** | |
20d652d7 RW |
683 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
684 | * @state: PM transition of the system being carried out. | |
775b64d2 | 685 | * |
20d652d7 RW |
686 | * Execute the ->complete() callbacks for all devices whose PM status is not |
687 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 688 | */ |
1eede070 | 689 | static void dpm_complete(pm_message_t state) |
cd59abfc | 690 | { |
1eede070 RW |
691 | struct list_head list; |
692 | ||
693 | INIT_LIST_HEAD(&list); | |
cd59abfc | 694 | mutex_lock(&dpm_list_mtx); |
e528e876 | 695 | transition_started = false; |
8a43a9ab RW |
696 | while (!list_empty(&dpm_prepared_list)) { |
697 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 698 | |
1eede070 RW |
699 | get_device(dev); |
700 | if (dev->power.status > DPM_ON) { | |
701 | dev->power.status = DPM_ON; | |
702 | mutex_unlock(&dpm_list_mtx); | |
703 | ||
d1616302 | 704 | device_complete(dev, state); |
aa0baaef | 705 | pm_runtime_put_sync(dev); |
1eede070 RW |
706 | |
707 | mutex_lock(&dpm_list_mtx); | |
708 | } | |
709 | if (!list_empty(&dev->power.entry)) | |
710 | list_move(&dev->power.entry, &list); | |
711 | put_device(dev); | |
cd59abfc | 712 | } |
1eede070 | 713 | list_splice(&list, &dpm_list); |
cd59abfc AS |
714 | mutex_unlock(&dpm_list_mtx); |
715 | } | |
716 | ||
cd59abfc | 717 | /** |
20d652d7 RW |
718 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
719 | * @state: PM transition of the system being carried out. | |
cd59abfc | 720 | * |
20d652d7 RW |
721 | * Execute "resume" callbacks for all devices and complete the PM transition of |
722 | * the system. | |
cd59abfc | 723 | */ |
d1616302 | 724 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 725 | { |
775b64d2 | 726 | might_sleep(); |
1eede070 RW |
727 | dpm_resume(state); |
728 | dpm_complete(state); | |
cd59abfc | 729 | } |
d1616302 | 730 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
731 | |
732 | ||
733 | /*------------------------- Suspend routines -------------------------*/ | |
734 | ||
1eede070 | 735 | /** |
20d652d7 RW |
736 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
737 | * @sleep_state: PM message representing a sleep state. | |
738 | * | |
739 | * Return a PM message representing the resume event corresponding to given | |
740 | * sleep state. | |
1eede070 RW |
741 | */ |
742 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 743 | { |
1eede070 RW |
744 | switch (sleep_state.event) { |
745 | case PM_EVENT_SUSPEND: | |
746 | return PMSG_RESUME; | |
747 | case PM_EVENT_FREEZE: | |
748 | case PM_EVENT_QUIESCE: | |
749 | return PMSG_RECOVER; | |
750 | case PM_EVENT_HIBERNATE: | |
751 | return PMSG_RESTORE; | |
cd59abfc | 752 | } |
1eede070 | 753 | return PMSG_ON; |
cd59abfc AS |
754 | } |
755 | ||
756 | /** | |
20d652d7 RW |
757 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
758 | * @dev: Device to handle. | |
759 | * @state: PM transition of the system being carried out. | |
775b64d2 | 760 | * |
20d652d7 RW |
761 | * The driver of @dev will not receive interrupts while this function is being |
762 | * executed. | |
cd59abfc | 763 | */ |
d1616302 | 764 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 RW |
765 | { |
766 | int error = 0; | |
cd59abfc | 767 | |
e7176a37 DB |
768 | if (dev->class && dev->class->pm) { |
769 | pm_dev_dbg(dev, state, "LATE class "); | |
770 | error = pm_noirq_op(dev, dev->class->pm, state); | |
771 | if (error) | |
772 | goto End; | |
773 | } | |
774 | ||
775 | if (dev->type && dev->type->pm) { | |
776 | pm_dev_dbg(dev, state, "LATE type "); | |
777 | error = pm_noirq_op(dev, dev->type->pm, state); | |
778 | if (error) | |
779 | goto End; | |
780 | } | |
781 | ||
33c33740 | 782 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
783 | pm_dev_dbg(dev, state, "LATE "); |
784 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
775b64d2 | 785 | } |
e7176a37 DB |
786 | |
787 | End: | |
775b64d2 RW |
788 | return error; |
789 | } | |
790 | ||
791 | /** | |
20d652d7 RW |
792 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
793 | * @state: PM transition of the system being carried out. | |
775b64d2 | 794 | * |
20d652d7 RW |
795 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
796 | * handlers for all non-sysdev devices. | |
775b64d2 | 797 | */ |
d1616302 | 798 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 799 | { |
ecf762b2 | 800 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
801 | int error = 0; |
802 | ||
2ed8d2b3 | 803 | suspend_device_irqs(); |
32bdfac5 | 804 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
805 | while (!list_empty(&dpm_suspended_list)) { |
806 | struct device *dev = to_device(dpm_suspended_list.prev); | |
d08a5ace RW |
807 | |
808 | get_device(dev); | |
809 | mutex_unlock(&dpm_list_mtx); | |
810 | ||
d1616302 | 811 | error = device_suspend_noirq(dev, state); |
d08a5ace RW |
812 | |
813 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 814 | if (error) { |
1eede070 | 815 | pm_dev_err(dev, state, " late", error); |
d08a5ace | 816 | put_device(dev); |
775b64d2 RW |
817 | break; |
818 | } | |
1eede070 | 819 | dev->power.status = DPM_OFF_IRQ; |
d08a5ace | 820 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 821 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 822 | put_device(dev); |
775b64d2 | 823 | } |
32bdfac5 | 824 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 825 | if (error) |
d1616302 | 826 | dpm_resume_noirq(resume_event(state)); |
ecf762b2 RW |
827 | else |
828 | dpm_show_time(starttime, state, "late"); | |
775b64d2 RW |
829 | return error; |
830 | } | |
d1616302 | 831 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
775b64d2 | 832 | |
875ab0b7 RW |
833 | /** |
834 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
835 | * @dev: Device to suspend. |
836 | * @state: PM transition of the system being carried out. | |
837 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
838 | */ |
839 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
840 | int (*cb)(struct device *dev, pm_message_t state)) | |
841 | { | |
842 | int error; | |
843 | ktime_t calltime; | |
844 | ||
845 | calltime = initcall_debug_start(dev); | |
846 | ||
847 | error = cb(dev, state); | |
848 | suspend_report_result(cb, error); | |
849 | ||
850 | initcall_debug_report(dev, calltime, error); | |
851 | ||
852 | return error; | |
853 | } | |
854 | ||
775b64d2 | 855 | /** |
20d652d7 RW |
856 | * device_suspend - Execute "suspend" callbacks for given device. |
857 | * @dev: Device to handle. | |
858 | * @state: PM transition of the system being carried out. | |
5af84b82 | 859 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 860 | */ |
5af84b82 | 861 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc AS |
862 | { |
863 | int error = 0; | |
864 | ||
5af84b82 | 865 | dpm_wait_for_children(dev, async); |
8e9394ce | 866 | device_lock(dev); |
7a8d37a3 | 867 | |
5af84b82 RW |
868 | if (async_error) |
869 | goto End; | |
870 | ||
d83f905e RW |
871 | if (pm_wakeup_pending()) { |
872 | async_error = -EBUSY; | |
873 | goto End; | |
874 | } | |
875 | ||
1eede070 RW |
876 | if (dev->class) { |
877 | if (dev->class->pm) { | |
878 | pm_dev_dbg(dev, state, "class "); | |
879 | error = pm_op(dev, dev->class->pm, state); | |
880 | } else if (dev->class->suspend) { | |
881 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 882 | error = legacy_suspend(dev, state, dev->class->suspend); |
1eede070 RW |
883 | } |
884 | if (error) | |
885 | goto End; | |
cd59abfc AS |
886 | } |
887 | ||
1eede070 RW |
888 | if (dev->type) { |
889 | if (dev->type->pm) { | |
890 | pm_dev_dbg(dev, state, "type "); | |
891 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
892 | } |
893 | if (error) | |
894 | goto End; | |
cd59abfc AS |
895 | } |
896 | ||
1eede070 RW |
897 | if (dev->bus) { |
898 | if (dev->bus->pm) { | |
899 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 900 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
901 | } else if (dev->bus->suspend) { |
902 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 903 | error = legacy_suspend(dev, state, dev->bus->suspend); |
1eede070 | 904 | } |
cd59abfc | 905 | } |
5af84b82 RW |
906 | |
907 | if (!error) | |
908 | dev->power.status = DPM_OFF; | |
909 | ||
1eede070 | 910 | End: |
8e9394ce | 911 | device_unlock(dev); |
5af84b82 | 912 | complete_all(&dev->power.completion); |
7a8d37a3 | 913 | |
098dff73 RW |
914 | if (error) |
915 | async_error = error; | |
916 | ||
cd59abfc AS |
917 | return error; |
918 | } | |
919 | ||
5af84b82 RW |
920 | static void async_suspend(void *data, async_cookie_t cookie) |
921 | { | |
922 | struct device *dev = (struct device *)data; | |
923 | int error; | |
924 | ||
925 | error = __device_suspend(dev, pm_transition, true); | |
098dff73 | 926 | if (error) |
5af84b82 | 927 | pm_dev_err(dev, pm_transition, " async", error); |
5af84b82 RW |
928 | |
929 | put_device(dev); | |
930 | } | |
931 | ||
932 | static int device_suspend(struct device *dev) | |
933 | { | |
934 | INIT_COMPLETION(dev->power.completion); | |
935 | ||
0e06b4a8 | 936 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
937 | get_device(dev); |
938 | async_schedule(async_suspend, dev); | |
939 | return 0; | |
940 | } | |
941 | ||
942 | return __device_suspend(dev, pm_transition, false); | |
943 | } | |
944 | ||
cd59abfc | 945 | /** |
20d652d7 RW |
946 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
947 | * @state: PM transition of the system being carried out. | |
cd59abfc | 948 | */ |
775b64d2 | 949 | static int dpm_suspend(pm_message_t state) |
cd59abfc | 950 | { |
ecf762b2 | 951 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
952 | int error = 0; |
953 | ||
cd59abfc | 954 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
955 | pm_transition = state; |
956 | async_error = 0; | |
8a43a9ab RW |
957 | while (!list_empty(&dpm_prepared_list)) { |
958 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 959 | |
1eede070 | 960 | get_device(dev); |
cd59abfc | 961 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 962 | |
5af84b82 | 963 | error = device_suspend(dev); |
1eede070 | 964 | |
1b3cbec1 | 965 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 966 | if (error) { |
1eede070 RW |
967 | pm_dev_err(dev, state, "", error); |
968 | put_device(dev); | |
775b64d2 RW |
969 | break; |
970 | } | |
7a8d37a3 | 971 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 972 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 973 | put_device(dev); |
5af84b82 RW |
974 | if (async_error) |
975 | break; | |
cd59abfc AS |
976 | } |
977 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
978 | async_synchronize_full(); |
979 | if (!error) | |
980 | error = async_error; | |
ecf762b2 RW |
981 | if (!error) |
982 | dpm_show_time(starttime, state, NULL); | |
1eede070 RW |
983 | return error; |
984 | } | |
985 | ||
986 | /** | |
20d652d7 RW |
987 | * device_prepare - Prepare a device for system power transition. |
988 | * @dev: Device to handle. | |
989 | * @state: PM transition of the system being carried out. | |
990 | * | |
991 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
992 | * device may be registered after this function has returned. | |
1eede070 | 993 | */ |
d1616302 | 994 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 RW |
995 | { |
996 | int error = 0; | |
997 | ||
8e9394ce | 998 | device_lock(dev); |
1eede070 | 999 | |
adf09493 | 1000 | if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { |
1eede070 | 1001 | pm_dev_dbg(dev, state, "preparing "); |
adf09493 RW |
1002 | error = dev->bus->pm->prepare(dev); |
1003 | suspend_report_result(dev->bus->pm->prepare, error); | |
1eede070 RW |
1004 | if (error) |
1005 | goto End; | |
1006 | } | |
1007 | ||
1008 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { | |
1009 | pm_dev_dbg(dev, state, "preparing type "); | |
1010 | error = dev->type->pm->prepare(dev); | |
1011 | suspend_report_result(dev->type->pm->prepare, error); | |
1012 | if (error) | |
1013 | goto End; | |
1014 | } | |
1015 | ||
1016 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { | |
1017 | pm_dev_dbg(dev, state, "preparing class "); | |
1018 | error = dev->class->pm->prepare(dev); | |
1019 | suspend_report_result(dev->class->pm->prepare, error); | |
1020 | } | |
1021 | End: | |
8e9394ce | 1022 | device_unlock(dev); |
1eede070 RW |
1023 | |
1024 | return error; | |
1025 | } | |
cd59abfc | 1026 | |
1eede070 | 1027 | /** |
20d652d7 RW |
1028 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1029 | * @state: PM transition of the system being carried out. | |
1eede070 | 1030 | * |
20d652d7 | 1031 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 RW |
1032 | */ |
1033 | static int dpm_prepare(pm_message_t state) | |
1034 | { | |
1eede070 RW |
1035 | int error = 0; |
1036 | ||
1eede070 RW |
1037 | mutex_lock(&dpm_list_mtx); |
1038 | transition_started = true; | |
1039 | while (!list_empty(&dpm_list)) { | |
1040 | struct device *dev = to_device(dpm_list.next); | |
1041 | ||
1042 | get_device(dev); | |
1043 | dev->power.status = DPM_PREPARING; | |
1044 | mutex_unlock(&dpm_list_mtx); | |
1045 | ||
5e928f77 | 1046 | pm_runtime_get_noresume(dev); |
1e75227e RW |
1047 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1048 | pm_wakeup_event(dev, 0); | |
1049 | ||
a2867e08 | 1050 | if (pm_wakeup_pending()) { |
aa0baaef | 1051 | pm_runtime_put_sync(dev); |
5e928f77 RW |
1052 | error = -EBUSY; |
1053 | } else { | |
1054 | error = device_prepare(dev, state); | |
1055 | } | |
1eede070 RW |
1056 | |
1057 | mutex_lock(&dpm_list_mtx); | |
1058 | if (error) { | |
1059 | dev->power.status = DPM_ON; | |
1060 | if (error == -EAGAIN) { | |
1061 | put_device(dev); | |
886a7a33 | 1062 | error = 0; |
1eede070 RW |
1063 | continue; |
1064 | } | |
1e75227e RW |
1065 | printk(KERN_INFO "PM: Device %s not prepared " |
1066 | "for power transition: code %d\n", | |
1eede070 RW |
1067 | kobject_name(&dev->kobj), error); |
1068 | put_device(dev); | |
1069 | break; | |
1070 | } | |
1071 | dev->power.status = DPM_SUSPENDING; | |
1072 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 1073 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1074 | put_device(dev); |
1075 | } | |
1eede070 | 1076 | mutex_unlock(&dpm_list_mtx); |
cd59abfc AS |
1077 | return error; |
1078 | } | |
1079 | ||
775b64d2 | 1080 | /** |
20d652d7 RW |
1081 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1082 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1083 | * |
20d652d7 RW |
1084 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1085 | * callbacks for them. | |
775b64d2 | 1086 | */ |
d1616302 | 1087 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1088 | { |
1089 | int error; | |
cd59abfc | 1090 | |
775b64d2 | 1091 | might_sleep(); |
1eede070 RW |
1092 | error = dpm_prepare(state); |
1093 | if (!error) | |
1094 | error = dpm_suspend(state); | |
cd59abfc | 1095 | return error; |
cd59abfc | 1096 | } |
d1616302 | 1097 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1098 | |
1099 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1100 | { | |
c80cfb04 BH |
1101 | if (ret) |
1102 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1103 | } |
1104 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1105 | |
1106 | /** | |
1107 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1108 | * @dev: Device to wait for. | |
1109 | * @subordinate: Device that needs to wait for @dev. | |
1110 | */ | |
098dff73 | 1111 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1112 | { |
1113 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1114 | return async_error; |
f8824cee RW |
1115 | } |
1116 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |