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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> |
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); |
1da177e4 | 45 | |
cd59abfc | 46 | static DEFINE_MUTEX(dpm_list_mtx); |
5af84b82 | 47 | static pm_message_t pm_transition; |
1da177e4 | 48 | |
1eede070 RW |
49 | /* |
50 | * Set once the preparation of devices for a PM transition has started, reset | |
51 | * before starting to resume devices. Protected by dpm_list_mtx. | |
52 | */ | |
53 | static bool transition_started; | |
54 | ||
098dff73 RW |
55 | static int async_error; |
56 | ||
5e928f77 | 57 | /** |
20d652d7 | 58 | * device_pm_init - Initialize the PM-related part of a device object. |
5e928f77 RW |
59 | * @dev: Device object being initialized. |
60 | */ | |
61 | void device_pm_init(struct device *dev) | |
62 | { | |
63 | dev->power.status = DPM_ON; | |
5af84b82 | 64 | init_completion(&dev->power.completion); |
152e1d59 | 65 | complete_all(&dev->power.completion); |
074037ec RW |
66 | dev->power.wakeup = NULL; |
67 | spin_lock_init(&dev->power.lock); | |
5e928f77 RW |
68 | pm_runtime_init(dev); |
69 | } | |
70 | ||
1eede070 | 71 | /** |
20d652d7 | 72 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
73 | */ |
74 | void device_pm_lock(void) | |
75 | { | |
76 | mutex_lock(&dpm_list_mtx); | |
77 | } | |
78 | ||
79 | /** | |
20d652d7 | 80 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
81 | */ |
82 | void device_pm_unlock(void) | |
83 | { | |
84 | mutex_unlock(&dpm_list_mtx); | |
85 | } | |
075c1771 | 86 | |
775b64d2 | 87 | /** |
20d652d7 RW |
88 | * device_pm_add - Add a device to the PM core's list of active devices. |
89 | * @dev: Device to add to the list. | |
775b64d2 | 90 | */ |
3b98aeaf | 91 | void device_pm_add(struct device *dev) |
1da177e4 | 92 | { |
1da177e4 | 93 | pr_debug("PM: Adding info for %s:%s\n", |
c48ea603 DT |
94 | dev->bus ? dev->bus->name : "No Bus", |
95 | kobject_name(&dev->kobj)); | |
11048dcf | 96 | mutex_lock(&dpm_list_mtx); |
1eede070 | 97 | if (dev->parent) { |
f5a6d958 RW |
98 | if (dev->parent->power.status >= DPM_SUSPENDING) |
99 | dev_warn(dev, "parent %s should not be sleeping\n", | |
1e0b2cf9 | 100 | dev_name(dev->parent)); |
1eede070 RW |
101 | } else if (transition_started) { |
102 | /* | |
103 | * We refuse to register parentless devices while a PM | |
104 | * transition is in progress in order to avoid leaving them | |
105 | * unhandled down the road | |
106 | */ | |
728f0893 | 107 | dev_WARN(dev, "Parentless device registered during a PM transaction\n"); |
58aca232 | 108 | } |
3b98aeaf AS |
109 | |
110 | list_add_tail(&dev->power.entry, &dpm_list); | |
11048dcf | 111 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
112 | } |
113 | ||
775b64d2 | 114 | /** |
20d652d7 RW |
115 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
116 | * @dev: Device to be removed from the list. | |
775b64d2 | 117 | */ |
9cddad77 | 118 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
119 | { |
120 | pr_debug("PM: Removing info for %s:%s\n", | |
c48ea603 DT |
121 | dev->bus ? dev->bus->name : "No Bus", |
122 | kobject_name(&dev->kobj)); | |
5af84b82 | 123 | complete_all(&dev->power.completion); |
11048dcf | 124 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 125 | list_del_init(&dev->power.entry); |
11048dcf | 126 | mutex_unlock(&dpm_list_mtx); |
074037ec | 127 | device_wakeup_disable(dev); |
5e928f77 | 128 | pm_runtime_remove(dev); |
775b64d2 RW |
129 | } |
130 | ||
ffa6a705 | 131 | /** |
20d652d7 RW |
132 | * device_pm_move_before - Move device in the PM core's list of active devices. |
133 | * @deva: Device to move in dpm_list. | |
134 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
135 | */ |
136 | void device_pm_move_before(struct device *deva, struct device *devb) | |
137 | { | |
138 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
139 | deva->bus ? deva->bus->name : "No Bus", | |
140 | kobject_name(&deva->kobj), | |
141 | devb->bus ? devb->bus->name : "No Bus", | |
142 | kobject_name(&devb->kobj)); | |
143 | /* Delete deva from dpm_list and reinsert before devb. */ | |
144 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
145 | } | |
146 | ||
147 | /** | |
20d652d7 RW |
148 | * device_pm_move_after - Move device in the PM core's list of active devices. |
149 | * @deva: Device to move in dpm_list. | |
150 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
151 | */ |
152 | void device_pm_move_after(struct device *deva, struct device *devb) | |
153 | { | |
154 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
155 | deva->bus ? deva->bus->name : "No Bus", | |
156 | kobject_name(&deva->kobj), | |
157 | devb->bus ? devb->bus->name : "No Bus", | |
158 | kobject_name(&devb->kobj)); | |
159 | /* Delete deva from dpm_list and reinsert after devb. */ | |
160 | list_move(&deva->power.entry, &devb->power.entry); | |
161 | } | |
162 | ||
163 | /** | |
20d652d7 RW |
164 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
165 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
166 | */ |
167 | void device_pm_move_last(struct device *dev) | |
168 | { | |
169 | pr_debug("PM: Moving %s:%s to end of list\n", | |
170 | dev->bus ? dev->bus->name : "No Bus", | |
171 | kobject_name(&dev->kobj)); | |
172 | list_move_tail(&dev->power.entry, &dpm_list); | |
173 | } | |
174 | ||
875ab0b7 RW |
175 | static ktime_t initcall_debug_start(struct device *dev) |
176 | { | |
177 | ktime_t calltime = ktime_set(0, 0); | |
178 | ||
179 | if (initcall_debug) { | |
180 | pr_info("calling %s+ @ %i\n", | |
181 | dev_name(dev), task_pid_nr(current)); | |
182 | calltime = ktime_get(); | |
183 | } | |
184 | ||
185 | return calltime; | |
186 | } | |
187 | ||
188 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
189 | int error) | |
190 | { | |
191 | ktime_t delta, rettime; | |
192 | ||
193 | if (initcall_debug) { | |
194 | rettime = ktime_get(); | |
195 | delta = ktime_sub(rettime, calltime); | |
196 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), | |
197 | error, (unsigned long long)ktime_to_ns(delta) >> 10); | |
198 | } | |
199 | } | |
200 | ||
5af84b82 RW |
201 | /** |
202 | * dpm_wait - Wait for a PM operation to complete. | |
203 | * @dev: Device to wait for. | |
204 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
205 | */ | |
206 | static void dpm_wait(struct device *dev, bool async) | |
207 | { | |
208 | if (!dev) | |
209 | return; | |
210 | ||
0e06b4a8 | 211 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
212 | wait_for_completion(&dev->power.completion); |
213 | } | |
214 | ||
215 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
216 | { | |
217 | dpm_wait(dev, *((bool *)async_ptr)); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | static void dpm_wait_for_children(struct device *dev, bool async) | |
222 | { | |
223 | device_for_each_child(dev, &async, dpm_wait_fn); | |
224 | } | |
225 | ||
1eede070 | 226 | /** |
20d652d7 RW |
227 | * pm_op - Execute the PM operation appropriate for given PM event. |
228 | * @dev: Device to handle. | |
229 | * @ops: PM operations to choose from. | |
230 | * @state: PM transition of the system being carried out. | |
1eede070 | 231 | */ |
d9ab7716 DT |
232 | static int pm_op(struct device *dev, |
233 | const struct dev_pm_ops *ops, | |
234 | pm_message_t state) | |
1eede070 RW |
235 | { |
236 | int error = 0; | |
875ab0b7 | 237 | ktime_t calltime; |
f2511774 | 238 | |
875ab0b7 | 239 | calltime = initcall_debug_start(dev); |
1eede070 RW |
240 | |
241 | switch (state.event) { | |
242 | #ifdef CONFIG_SUSPEND | |
243 | case PM_EVENT_SUSPEND: | |
244 | if (ops->suspend) { | |
245 | error = ops->suspend(dev); | |
246 | suspend_report_result(ops->suspend, error); | |
247 | } | |
248 | break; | |
249 | case PM_EVENT_RESUME: | |
250 | if (ops->resume) { | |
251 | error = ops->resume(dev); | |
252 | suspend_report_result(ops->resume, error); | |
253 | } | |
254 | break; | |
255 | #endif /* CONFIG_SUSPEND */ | |
256 | #ifdef CONFIG_HIBERNATION | |
257 | case PM_EVENT_FREEZE: | |
258 | case PM_EVENT_QUIESCE: | |
259 | if (ops->freeze) { | |
260 | error = ops->freeze(dev); | |
261 | suspend_report_result(ops->freeze, error); | |
262 | } | |
263 | break; | |
264 | case PM_EVENT_HIBERNATE: | |
265 | if (ops->poweroff) { | |
266 | error = ops->poweroff(dev); | |
267 | suspend_report_result(ops->poweroff, error); | |
268 | } | |
269 | break; | |
270 | case PM_EVENT_THAW: | |
271 | case PM_EVENT_RECOVER: | |
272 | if (ops->thaw) { | |
273 | error = ops->thaw(dev); | |
274 | suspend_report_result(ops->thaw, error); | |
275 | } | |
276 | break; | |
277 | case PM_EVENT_RESTORE: | |
278 | if (ops->restore) { | |
279 | error = ops->restore(dev); | |
280 | suspend_report_result(ops->restore, error); | |
281 | } | |
282 | break; | |
283 | #endif /* CONFIG_HIBERNATION */ | |
284 | default: | |
285 | error = -EINVAL; | |
286 | } | |
f2511774 | 287 | |
875ab0b7 | 288 | initcall_debug_report(dev, calltime, error); |
f2511774 | 289 | |
1eede070 RW |
290 | return error; |
291 | } | |
292 | ||
293 | /** | |
20d652d7 RW |
294 | * pm_noirq_op - Execute the PM operation appropriate for given PM event. |
295 | * @dev: Device to handle. | |
296 | * @ops: PM operations to choose from. | |
297 | * @state: PM transition of the system being carried out. | |
1eede070 | 298 | * |
20d652d7 RW |
299 | * The driver of @dev will not receive interrupts while this function is being |
300 | * executed. | |
1eede070 | 301 | */ |
d9ab7716 DT |
302 | static int pm_noirq_op(struct device *dev, |
303 | const struct dev_pm_ops *ops, | |
1eede070 RW |
304 | pm_message_t state) |
305 | { | |
306 | int error = 0; | |
f2511774 AV |
307 | ktime_t calltime, delta, rettime; |
308 | ||
309 | if (initcall_debug) { | |
8cc6b39f RW |
310 | pr_info("calling %s+ @ %i, parent: %s\n", |
311 | dev_name(dev), task_pid_nr(current), | |
312 | dev->parent ? dev_name(dev->parent) : "none"); | |
f2511774 AV |
313 | calltime = ktime_get(); |
314 | } | |
1eede070 RW |
315 | |
316 | switch (state.event) { | |
317 | #ifdef CONFIG_SUSPEND | |
318 | case PM_EVENT_SUSPEND: | |
319 | if (ops->suspend_noirq) { | |
320 | error = ops->suspend_noirq(dev); | |
321 | suspend_report_result(ops->suspend_noirq, error); | |
322 | } | |
323 | break; | |
324 | case PM_EVENT_RESUME: | |
325 | if (ops->resume_noirq) { | |
326 | error = ops->resume_noirq(dev); | |
327 | suspend_report_result(ops->resume_noirq, error); | |
328 | } | |
329 | break; | |
330 | #endif /* CONFIG_SUSPEND */ | |
331 | #ifdef CONFIG_HIBERNATION | |
332 | case PM_EVENT_FREEZE: | |
333 | case PM_EVENT_QUIESCE: | |
334 | if (ops->freeze_noirq) { | |
335 | error = ops->freeze_noirq(dev); | |
336 | suspend_report_result(ops->freeze_noirq, error); | |
337 | } | |
338 | break; | |
339 | case PM_EVENT_HIBERNATE: | |
340 | if (ops->poweroff_noirq) { | |
341 | error = ops->poweroff_noirq(dev); | |
342 | suspend_report_result(ops->poweroff_noirq, error); | |
343 | } | |
344 | break; | |
345 | case PM_EVENT_THAW: | |
346 | case PM_EVENT_RECOVER: | |
347 | if (ops->thaw_noirq) { | |
348 | error = ops->thaw_noirq(dev); | |
349 | suspend_report_result(ops->thaw_noirq, error); | |
350 | } | |
351 | break; | |
352 | case PM_EVENT_RESTORE: | |
353 | if (ops->restore_noirq) { | |
354 | error = ops->restore_noirq(dev); | |
355 | suspend_report_result(ops->restore_noirq, error); | |
356 | } | |
357 | break; | |
358 | #endif /* CONFIG_HIBERNATION */ | |
359 | default: | |
360 | error = -EINVAL; | |
361 | } | |
f2511774 AV |
362 | |
363 | if (initcall_debug) { | |
364 | rettime = ktime_get(); | |
365 | delta = ktime_sub(rettime, calltime); | |
875ab0b7 RW |
366 | printk("initcall %s_i+ returned %d after %Ld usecs\n", |
367 | dev_name(dev), error, | |
368 | (unsigned long long)ktime_to_ns(delta) >> 10); | |
f2511774 AV |
369 | } |
370 | ||
1eede070 RW |
371 | return error; |
372 | } | |
373 | ||
374 | static char *pm_verb(int event) | |
375 | { | |
376 | switch (event) { | |
377 | case PM_EVENT_SUSPEND: | |
378 | return "suspend"; | |
379 | case PM_EVENT_RESUME: | |
380 | return "resume"; | |
381 | case PM_EVENT_FREEZE: | |
382 | return "freeze"; | |
383 | case PM_EVENT_QUIESCE: | |
384 | return "quiesce"; | |
385 | case PM_EVENT_HIBERNATE: | |
386 | return "hibernate"; | |
387 | case PM_EVENT_THAW: | |
388 | return "thaw"; | |
389 | case PM_EVENT_RESTORE: | |
390 | return "restore"; | |
391 | case PM_EVENT_RECOVER: | |
392 | return "recover"; | |
393 | default: | |
394 | return "(unknown PM event)"; | |
395 | } | |
396 | } | |
397 | ||
398 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) | |
399 | { | |
400 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
401 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
402 | ", may wakeup" : ""); | |
403 | } | |
404 | ||
405 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
406 | int error) | |
407 | { | |
408 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
409 | kobject_name(&dev->kobj), pm_verb(state.event), info, error); | |
410 | } | |
411 | ||
ecf762b2 RW |
412 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
413 | { | |
414 | ktime_t calltime; | |
0702d9ee | 415 | u64 usecs64; |
ecf762b2 RW |
416 | int usecs; |
417 | ||
418 | calltime = ktime_get(); | |
419 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
420 | do_div(usecs64, NSEC_PER_USEC); | |
421 | usecs = usecs64; | |
422 | if (usecs == 0) | |
423 | usecs = 1; | |
424 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
425 | info ?: "", info ? " " : "", pm_verb(state.event), | |
426 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
427 | } | |
428 | ||
cd59abfc AS |
429 | /*------------------------- Resume routines -------------------------*/ |
430 | ||
431 | /** | |
20d652d7 RW |
432 | * device_resume_noirq - Execute an "early resume" callback for given device. |
433 | * @dev: Device to handle. | |
434 | * @state: PM transition of the system being carried out. | |
cd59abfc | 435 | * |
20d652d7 RW |
436 | * The driver of @dev will not receive interrupts while this function is being |
437 | * executed. | |
cd59abfc | 438 | */ |
d1616302 | 439 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
cd59abfc AS |
440 | { |
441 | int error = 0; | |
442 | ||
443 | TRACE_DEVICE(dev); | |
444 | TRACE_RESUME(0); | |
445 | ||
33c33740 | 446 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
447 | pm_dev_dbg(dev, state, "EARLY "); |
448 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
e7176a37 DB |
449 | if (error) |
450 | goto End; | |
775b64d2 | 451 | } |
33c33740 | 452 | |
e7176a37 DB |
453 | if (dev->type && dev->type->pm) { |
454 | pm_dev_dbg(dev, state, "EARLY type "); | |
455 | error = pm_noirq_op(dev, dev->type->pm, state); | |
456 | if (error) | |
457 | goto End; | |
458 | } | |
459 | ||
460 | if (dev->class && dev->class->pm) { | |
461 | pm_dev_dbg(dev, state, "EARLY class "); | |
462 | error = pm_noirq_op(dev, dev->class->pm, state); | |
463 | } | |
464 | ||
465 | End: | |
775b64d2 RW |
466 | TRACE_RESUME(error); |
467 | return error; | |
468 | } | |
469 | ||
470 | /** | |
20d652d7 RW |
471 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
472 | * @state: PM transition of the system being carried out. | |
775b64d2 | 473 | * |
20d652d7 RW |
474 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
475 | * enable device drivers to receive interrupts. | |
775b64d2 | 476 | */ |
d1616302 | 477 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 478 | { |
d08a5ace | 479 | struct list_head list; |
ecf762b2 | 480 | ktime_t starttime = ktime_get(); |
775b64d2 | 481 | |
d08a5ace | 482 | INIT_LIST_HEAD(&list); |
32bdfac5 | 483 | mutex_lock(&dpm_list_mtx); |
3eb132c9 | 484 | transition_started = false; |
d08a5ace RW |
485 | while (!list_empty(&dpm_list)) { |
486 | struct device *dev = to_device(dpm_list.next); | |
487 | ||
488 | get_device(dev); | |
1eede070 RW |
489 | if (dev->power.status > DPM_OFF) { |
490 | int error; | |
775b64d2 | 491 | |
1eede070 | 492 | dev->power.status = DPM_OFF; |
d08a5ace RW |
493 | mutex_unlock(&dpm_list_mtx); |
494 | ||
d1616302 | 495 | error = device_resume_noirq(dev, state); |
d08a5ace RW |
496 | |
497 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
498 | if (error) |
499 | pm_dev_err(dev, state, " early", error); | |
500 | } | |
d08a5ace RW |
501 | if (!list_empty(&dev->power.entry)) |
502 | list_move_tail(&dev->power.entry, &list); | |
503 | put_device(dev); | |
504 | } | |
505 | list_splice(&list, &dpm_list); | |
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 | { | |
614 | struct list_head list; | |
97df8c12 | 615 | struct device *dev; |
ecf762b2 | 616 | ktime_t starttime = ktime_get(); |
1eede070 RW |
617 | |
618 | INIT_LIST_HEAD(&list); | |
619 | mutex_lock(&dpm_list_mtx); | |
5af84b82 | 620 | pm_transition = state; |
098dff73 | 621 | async_error = 0; |
1eede070 | 622 | |
97df8c12 RW |
623 | list_for_each_entry(dev, &dpm_list, power.entry) { |
624 | if (dev->power.status < DPM_OFF) | |
625 | continue; | |
626 | ||
627 | INIT_COMPLETION(dev->power.completion); | |
628 | if (is_async(dev)) { | |
629 | get_device(dev); | |
630 | async_schedule(async_resume, dev); | |
631 | } | |
632 | } | |
633 | ||
634 | while (!list_empty(&dpm_list)) { | |
635 | dev = to_device(dpm_list.next); | |
1eede070 | 636 | get_device(dev); |
97df8c12 | 637 | if (dev->power.status >= DPM_OFF && !is_async(dev)) { |
1eede070 RW |
638 | int error; |
639 | ||
1eede070 RW |
640 | mutex_unlock(&dpm_list_mtx); |
641 | ||
97df8c12 | 642 | error = device_resume(dev, state, false); |
1eede070 RW |
643 | |
644 | mutex_lock(&dpm_list_mtx); | |
645 | if (error) | |
646 | pm_dev_err(dev, state, "", error); | |
647 | } else if (dev->power.status == DPM_SUSPENDING) { | |
648 | /* Allow new children of the device to be registered */ | |
649 | dev->power.status = DPM_RESUMING; | |
650 | } | |
651 | if (!list_empty(&dev->power.entry)) | |
652 | list_move_tail(&dev->power.entry, &list); | |
653 | put_device(dev); | |
654 | } | |
655 | list_splice(&list, &dpm_list); | |
656 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 | 657 | async_synchronize_full(); |
ecf762b2 | 658 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
659 | } |
660 | ||
661 | /** | |
20d652d7 RW |
662 | * device_complete - Complete a PM transition for given device. |
663 | * @dev: Device to handle. | |
664 | * @state: PM transition of the system being carried out. | |
1eede070 | 665 | */ |
d1616302 | 666 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 667 | { |
8e9394ce | 668 | device_lock(dev); |
1eede070 RW |
669 | |
670 | if (dev->class && dev->class->pm && dev->class->pm->complete) { | |
671 | pm_dev_dbg(dev, state, "completing class "); | |
672 | dev->class->pm->complete(dev); | |
673 | } | |
674 | ||
675 | if (dev->type && dev->type->pm && dev->type->pm->complete) { | |
676 | pm_dev_dbg(dev, state, "completing type "); | |
677 | dev->type->pm->complete(dev); | |
678 | } | |
679 | ||
adf09493 | 680 | if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { |
1eede070 | 681 | pm_dev_dbg(dev, state, "completing "); |
adf09493 | 682 | dev->bus->pm->complete(dev); |
1eede070 RW |
683 | } |
684 | ||
8e9394ce | 685 | device_unlock(dev); |
1eede070 RW |
686 | } |
687 | ||
688 | /** | |
20d652d7 RW |
689 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
690 | * @state: PM transition of the system being carried out. | |
775b64d2 | 691 | * |
20d652d7 RW |
692 | * Execute the ->complete() callbacks for all devices whose PM status is not |
693 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 694 | */ |
1eede070 | 695 | static void dpm_complete(pm_message_t state) |
cd59abfc | 696 | { |
1eede070 RW |
697 | struct list_head list; |
698 | ||
699 | INIT_LIST_HEAD(&list); | |
cd59abfc | 700 | mutex_lock(&dpm_list_mtx); |
e528e876 | 701 | transition_started = false; |
1eede070 RW |
702 | while (!list_empty(&dpm_list)) { |
703 | struct device *dev = to_device(dpm_list.prev); | |
cd59abfc | 704 | |
1eede070 RW |
705 | get_device(dev); |
706 | if (dev->power.status > DPM_ON) { | |
707 | dev->power.status = DPM_ON; | |
708 | mutex_unlock(&dpm_list_mtx); | |
709 | ||
d1616302 | 710 | device_complete(dev, state); |
aa0baaef | 711 | pm_runtime_put_sync(dev); |
1eede070 RW |
712 | |
713 | mutex_lock(&dpm_list_mtx); | |
714 | } | |
715 | if (!list_empty(&dev->power.entry)) | |
716 | list_move(&dev->power.entry, &list); | |
717 | put_device(dev); | |
cd59abfc | 718 | } |
1eede070 | 719 | list_splice(&list, &dpm_list); |
cd59abfc AS |
720 | mutex_unlock(&dpm_list_mtx); |
721 | } | |
722 | ||
cd59abfc | 723 | /** |
20d652d7 RW |
724 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
725 | * @state: PM transition of the system being carried out. | |
cd59abfc | 726 | * |
20d652d7 RW |
727 | * Execute "resume" callbacks for all devices and complete the PM transition of |
728 | * the system. | |
cd59abfc | 729 | */ |
d1616302 | 730 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 731 | { |
775b64d2 | 732 | might_sleep(); |
1eede070 RW |
733 | dpm_resume(state); |
734 | dpm_complete(state); | |
cd59abfc | 735 | } |
d1616302 | 736 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
737 | |
738 | ||
739 | /*------------------------- Suspend routines -------------------------*/ | |
740 | ||
1eede070 | 741 | /** |
20d652d7 RW |
742 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
743 | * @sleep_state: PM message representing a sleep state. | |
744 | * | |
745 | * Return a PM message representing the resume event corresponding to given | |
746 | * sleep state. | |
1eede070 RW |
747 | */ |
748 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 749 | { |
1eede070 RW |
750 | switch (sleep_state.event) { |
751 | case PM_EVENT_SUSPEND: | |
752 | return PMSG_RESUME; | |
753 | case PM_EVENT_FREEZE: | |
754 | case PM_EVENT_QUIESCE: | |
755 | return PMSG_RECOVER; | |
756 | case PM_EVENT_HIBERNATE: | |
757 | return PMSG_RESTORE; | |
cd59abfc | 758 | } |
1eede070 | 759 | return PMSG_ON; |
cd59abfc AS |
760 | } |
761 | ||
762 | /** | |
20d652d7 RW |
763 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
764 | * @dev: Device to handle. | |
765 | * @state: PM transition of the system being carried out. | |
775b64d2 | 766 | * |
20d652d7 RW |
767 | * The driver of @dev will not receive interrupts while this function is being |
768 | * executed. | |
cd59abfc | 769 | */ |
d1616302 | 770 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 RW |
771 | { |
772 | int error = 0; | |
cd59abfc | 773 | |
e7176a37 DB |
774 | if (dev->class && dev->class->pm) { |
775 | pm_dev_dbg(dev, state, "LATE class "); | |
776 | error = pm_noirq_op(dev, dev->class->pm, state); | |
777 | if (error) | |
778 | goto End; | |
779 | } | |
780 | ||
781 | if (dev->type && dev->type->pm) { | |
782 | pm_dev_dbg(dev, state, "LATE type "); | |
783 | error = pm_noirq_op(dev, dev->type->pm, state); | |
784 | if (error) | |
785 | goto End; | |
786 | } | |
787 | ||
33c33740 | 788 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
789 | pm_dev_dbg(dev, state, "LATE "); |
790 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
775b64d2 | 791 | } |
e7176a37 DB |
792 | |
793 | End: | |
775b64d2 RW |
794 | return error; |
795 | } | |
796 | ||
797 | /** | |
20d652d7 RW |
798 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
799 | * @state: PM transition of the system being carried out. | |
775b64d2 | 800 | * |
20d652d7 RW |
801 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
802 | * handlers for all non-sysdev devices. | |
775b64d2 | 803 | */ |
d1616302 | 804 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 805 | { |
d08a5ace | 806 | struct list_head list; |
ecf762b2 | 807 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
808 | int error = 0; |
809 | ||
d08a5ace | 810 | INIT_LIST_HEAD(&list); |
2ed8d2b3 | 811 | suspend_device_irqs(); |
32bdfac5 | 812 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
813 | while (!list_empty(&dpm_list)) { |
814 | struct device *dev = to_device(dpm_list.prev); | |
815 | ||
816 | get_device(dev); | |
817 | mutex_unlock(&dpm_list_mtx); | |
818 | ||
d1616302 | 819 | error = device_suspend_noirq(dev, state); |
d08a5ace RW |
820 | |
821 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 822 | if (error) { |
1eede070 | 823 | pm_dev_err(dev, state, " late", error); |
d08a5ace | 824 | put_device(dev); |
775b64d2 RW |
825 | break; |
826 | } | |
1eede070 | 827 | dev->power.status = DPM_OFF_IRQ; |
d08a5ace RW |
828 | if (!list_empty(&dev->power.entry)) |
829 | list_move(&dev->power.entry, &list); | |
830 | put_device(dev); | |
775b64d2 | 831 | } |
d08a5ace | 832 | list_splice_tail(&list, &dpm_list); |
32bdfac5 | 833 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 834 | if (error) |
d1616302 | 835 | dpm_resume_noirq(resume_event(state)); |
ecf762b2 RW |
836 | else |
837 | dpm_show_time(starttime, state, "late"); | |
775b64d2 RW |
838 | return error; |
839 | } | |
d1616302 | 840 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
775b64d2 | 841 | |
875ab0b7 RW |
842 | /** |
843 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
844 | * @dev: Device to suspend. |
845 | * @state: PM transition of the system being carried out. | |
846 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
847 | */ |
848 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
849 | int (*cb)(struct device *dev, pm_message_t state)) | |
850 | { | |
851 | int error; | |
852 | ktime_t calltime; | |
853 | ||
854 | calltime = initcall_debug_start(dev); | |
855 | ||
856 | error = cb(dev, state); | |
857 | suspend_report_result(cb, error); | |
858 | ||
859 | initcall_debug_report(dev, calltime, error); | |
860 | ||
861 | return error; | |
862 | } | |
863 | ||
775b64d2 | 864 | /** |
20d652d7 RW |
865 | * device_suspend - Execute "suspend" callbacks for given device. |
866 | * @dev: Device to handle. | |
867 | * @state: PM transition of the system being carried out. | |
5af84b82 | 868 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 869 | */ |
5af84b82 | 870 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc AS |
871 | { |
872 | int error = 0; | |
873 | ||
5af84b82 | 874 | dpm_wait_for_children(dev, async); |
8e9394ce | 875 | device_lock(dev); |
7a8d37a3 | 876 | |
5af84b82 RW |
877 | if (async_error) |
878 | goto End; | |
879 | ||
1eede070 RW |
880 | if (dev->class) { |
881 | if (dev->class->pm) { | |
882 | pm_dev_dbg(dev, state, "class "); | |
883 | error = pm_op(dev, dev->class->pm, state); | |
884 | } else if (dev->class->suspend) { | |
885 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 886 | error = legacy_suspend(dev, state, dev->class->suspend); |
1eede070 RW |
887 | } |
888 | if (error) | |
889 | goto End; | |
cd59abfc AS |
890 | } |
891 | ||
1eede070 RW |
892 | if (dev->type) { |
893 | if (dev->type->pm) { | |
894 | pm_dev_dbg(dev, state, "type "); | |
895 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
896 | } |
897 | if (error) | |
898 | goto End; | |
cd59abfc AS |
899 | } |
900 | ||
1eede070 RW |
901 | if (dev->bus) { |
902 | if (dev->bus->pm) { | |
903 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 904 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
905 | } else if (dev->bus->suspend) { |
906 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 907 | error = legacy_suspend(dev, state, dev->bus->suspend); |
1eede070 | 908 | } |
cd59abfc | 909 | } |
5af84b82 RW |
910 | |
911 | if (!error) | |
912 | dev->power.status = DPM_OFF; | |
913 | ||
1eede070 | 914 | End: |
8e9394ce | 915 | device_unlock(dev); |
5af84b82 | 916 | complete_all(&dev->power.completion); |
7a8d37a3 | 917 | |
098dff73 RW |
918 | if (error) |
919 | async_error = error; | |
920 | ||
cd59abfc AS |
921 | return error; |
922 | } | |
923 | ||
5af84b82 RW |
924 | static void async_suspend(void *data, async_cookie_t cookie) |
925 | { | |
926 | struct device *dev = (struct device *)data; | |
927 | int error; | |
928 | ||
929 | error = __device_suspend(dev, pm_transition, true); | |
098dff73 | 930 | if (error) |
5af84b82 | 931 | pm_dev_err(dev, pm_transition, " async", error); |
5af84b82 RW |
932 | |
933 | put_device(dev); | |
934 | } | |
935 | ||
936 | static int device_suspend(struct device *dev) | |
937 | { | |
938 | INIT_COMPLETION(dev->power.completion); | |
939 | ||
0e06b4a8 | 940 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
941 | get_device(dev); |
942 | async_schedule(async_suspend, dev); | |
943 | return 0; | |
944 | } | |
945 | ||
946 | return __device_suspend(dev, pm_transition, false); | |
947 | } | |
948 | ||
cd59abfc | 949 | /** |
20d652d7 RW |
950 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
951 | * @state: PM transition of the system being carried out. | |
cd59abfc | 952 | */ |
775b64d2 | 953 | static int dpm_suspend(pm_message_t state) |
cd59abfc | 954 | { |
1eede070 | 955 | struct list_head list; |
ecf762b2 | 956 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
957 | int error = 0; |
958 | ||
1eede070 | 959 | INIT_LIST_HEAD(&list); |
cd59abfc | 960 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
961 | pm_transition = state; |
962 | async_error = 0; | |
1eede070 RW |
963 | while (!list_empty(&dpm_list)) { |
964 | struct device *dev = to_device(dpm_list.prev); | |
58aca232 | 965 | |
1eede070 | 966 | get_device(dev); |
cd59abfc | 967 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 968 | |
5af84b82 | 969 | error = device_suspend(dev); |
1eede070 | 970 | |
1b3cbec1 | 971 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 972 | if (error) { |
1eede070 RW |
973 | pm_dev_err(dev, state, "", error); |
974 | put_device(dev); | |
775b64d2 RW |
975 | break; |
976 | } | |
7a8d37a3 | 977 | if (!list_empty(&dev->power.entry)) |
1eede070 RW |
978 | list_move(&dev->power.entry, &list); |
979 | put_device(dev); | |
5af84b82 RW |
980 | if (async_error) |
981 | break; | |
cd59abfc | 982 | } |
1eede070 | 983 | list_splice(&list, dpm_list.prev); |
cd59abfc | 984 | mutex_unlock(&dpm_list_mtx); |
5af84b82 RW |
985 | async_synchronize_full(); |
986 | if (!error) | |
987 | error = async_error; | |
ecf762b2 RW |
988 | if (!error) |
989 | dpm_show_time(starttime, state, NULL); | |
1eede070 RW |
990 | return error; |
991 | } | |
992 | ||
993 | /** | |
20d652d7 RW |
994 | * device_prepare - Prepare a device for system power transition. |
995 | * @dev: Device to handle. | |
996 | * @state: PM transition of the system being carried out. | |
997 | * | |
998 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
999 | * device may be registered after this function has returned. | |
1eede070 | 1000 | */ |
d1616302 | 1001 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 RW |
1002 | { |
1003 | int error = 0; | |
1004 | ||
8e9394ce | 1005 | device_lock(dev); |
1eede070 | 1006 | |
adf09493 | 1007 | if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { |
1eede070 | 1008 | pm_dev_dbg(dev, state, "preparing "); |
adf09493 RW |
1009 | error = dev->bus->pm->prepare(dev); |
1010 | suspend_report_result(dev->bus->pm->prepare, error); | |
1eede070 RW |
1011 | if (error) |
1012 | goto End; | |
1013 | } | |
1014 | ||
1015 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { | |
1016 | pm_dev_dbg(dev, state, "preparing type "); | |
1017 | error = dev->type->pm->prepare(dev); | |
1018 | suspend_report_result(dev->type->pm->prepare, error); | |
1019 | if (error) | |
1020 | goto End; | |
1021 | } | |
1022 | ||
1023 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { | |
1024 | pm_dev_dbg(dev, state, "preparing class "); | |
1025 | error = dev->class->pm->prepare(dev); | |
1026 | suspend_report_result(dev->class->pm->prepare, error); | |
1027 | } | |
1028 | End: | |
8e9394ce | 1029 | device_unlock(dev); |
1eede070 RW |
1030 | |
1031 | return error; | |
1032 | } | |
cd59abfc | 1033 | |
1eede070 | 1034 | /** |
20d652d7 RW |
1035 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1036 | * @state: PM transition of the system being carried out. | |
1eede070 | 1037 | * |
20d652d7 | 1038 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 RW |
1039 | */ |
1040 | static int dpm_prepare(pm_message_t state) | |
1041 | { | |
1042 | struct list_head list; | |
1043 | int error = 0; | |
1044 | ||
1045 | INIT_LIST_HEAD(&list); | |
1046 | mutex_lock(&dpm_list_mtx); | |
1047 | transition_started = true; | |
1048 | while (!list_empty(&dpm_list)) { | |
1049 | struct device *dev = to_device(dpm_list.next); | |
1050 | ||
1051 | get_device(dev); | |
1052 | dev->power.status = DPM_PREPARING; | |
1053 | mutex_unlock(&dpm_list_mtx); | |
1054 | ||
5e928f77 | 1055 | pm_runtime_get_noresume(dev); |
1e75227e RW |
1056 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1057 | pm_wakeup_event(dev, 0); | |
1058 | ||
a2867e08 | 1059 | if (pm_wakeup_pending()) { |
aa0baaef | 1060 | pm_runtime_put_sync(dev); |
5e928f77 RW |
1061 | error = -EBUSY; |
1062 | } else { | |
1063 | error = device_prepare(dev, state); | |
1064 | } | |
1eede070 RW |
1065 | |
1066 | mutex_lock(&dpm_list_mtx); | |
1067 | if (error) { | |
1068 | dev->power.status = DPM_ON; | |
1069 | if (error == -EAGAIN) { | |
1070 | put_device(dev); | |
886a7a33 | 1071 | error = 0; |
1eede070 RW |
1072 | continue; |
1073 | } | |
1e75227e RW |
1074 | printk(KERN_INFO "PM: Device %s not prepared " |
1075 | "for power transition: code %d\n", | |
1eede070 RW |
1076 | kobject_name(&dev->kobj), error); |
1077 | put_device(dev); | |
1078 | break; | |
1079 | } | |
1080 | dev->power.status = DPM_SUSPENDING; | |
1081 | if (!list_empty(&dev->power.entry)) | |
1082 | list_move_tail(&dev->power.entry, &list); | |
1083 | put_device(dev); | |
1084 | } | |
1085 | list_splice(&list, &dpm_list); | |
1086 | mutex_unlock(&dpm_list_mtx); | |
cd59abfc AS |
1087 | return error; |
1088 | } | |
1089 | ||
775b64d2 | 1090 | /** |
20d652d7 RW |
1091 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1092 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1093 | * |
20d652d7 RW |
1094 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1095 | * callbacks for them. | |
775b64d2 | 1096 | */ |
d1616302 | 1097 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1098 | { |
1099 | int error; | |
cd59abfc | 1100 | |
775b64d2 | 1101 | might_sleep(); |
1eede070 RW |
1102 | error = dpm_prepare(state); |
1103 | if (!error) | |
1104 | error = dpm_suspend(state); | |
cd59abfc | 1105 | return error; |
cd59abfc | 1106 | } |
d1616302 | 1107 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1108 | |
1109 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1110 | { | |
c80cfb04 BH |
1111 | if (ret) |
1112 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1113 | } |
1114 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1115 | |
1116 | /** | |
1117 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1118 | * @dev: Device to wait for. | |
1119 | * @subordinate: Device that needs to wait for @dev. | |
1120 | */ | |
098dff73 | 1121 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1122 | { |
1123 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1124 | return async_error; |
f8824cee RW |
1125 | } |
1126 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |