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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. | |
b595076a | 11 | * This will initialize the embedded device_pm_info object in the device |
1da177e4 LT |
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 | |
098dff73 RW |
52 | static int async_error; |
53 | ||
5e928f77 | 54 | /** |
20d652d7 | 55 | * device_pm_init - Initialize the PM-related part of a device object. |
5e928f77 RW |
56 | * @dev: Device object being initialized. |
57 | */ | |
58 | void device_pm_init(struct device *dev) | |
59 | { | |
b8c76f6a | 60 | dev->power.in_suspend = false; |
5af84b82 | 61 | init_completion(&dev->power.completion); |
152e1d59 | 62 | complete_all(&dev->power.completion); |
074037ec RW |
63 | dev->power.wakeup = NULL; |
64 | spin_lock_init(&dev->power.lock); | |
5e928f77 RW |
65 | pm_runtime_init(dev); |
66 | } | |
67 | ||
1eede070 | 68 | /** |
20d652d7 | 69 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
70 | */ |
71 | void device_pm_lock(void) | |
72 | { | |
73 | mutex_lock(&dpm_list_mtx); | |
74 | } | |
75 | ||
76 | /** | |
20d652d7 | 77 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
78 | */ |
79 | void device_pm_unlock(void) | |
80 | { | |
81 | mutex_unlock(&dpm_list_mtx); | |
82 | } | |
075c1771 | 83 | |
775b64d2 | 84 | /** |
20d652d7 RW |
85 | * device_pm_add - Add a device to the PM core's list of active devices. |
86 | * @dev: Device to add to the list. | |
775b64d2 | 87 | */ |
3b98aeaf | 88 | void device_pm_add(struct device *dev) |
1da177e4 | 89 | { |
1da177e4 | 90 | pr_debug("PM: Adding info for %s:%s\n", |
5c1a07ab | 91 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
11048dcf | 92 | mutex_lock(&dpm_list_mtx); |
b64959e6 RW |
93 | if (dev->parent && dev->parent->power.in_suspend) |
94 | dev_warn(dev, "parent %s should not be sleeping\n", | |
95 | dev_name(dev->parent)); | |
3b98aeaf | 96 | list_add_tail(&dev->power.entry, &dpm_list); |
11048dcf | 97 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
98 | } |
99 | ||
775b64d2 | 100 | /** |
20d652d7 RW |
101 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
102 | * @dev: Device to be removed from the list. | |
775b64d2 | 103 | */ |
9cddad77 | 104 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
105 | { |
106 | pr_debug("PM: Removing info for %s:%s\n", | |
5c1a07ab | 107 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
5af84b82 | 108 | complete_all(&dev->power.completion); |
11048dcf | 109 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 110 | list_del_init(&dev->power.entry); |
11048dcf | 111 | mutex_unlock(&dpm_list_mtx); |
074037ec | 112 | device_wakeup_disable(dev); |
5e928f77 | 113 | pm_runtime_remove(dev); |
775b64d2 RW |
114 | } |
115 | ||
ffa6a705 | 116 | /** |
20d652d7 RW |
117 | * device_pm_move_before - Move device in the PM core's list of active devices. |
118 | * @deva: Device to move in dpm_list. | |
119 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
120 | */ |
121 | void device_pm_move_before(struct device *deva, struct device *devb) | |
122 | { | |
123 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
5c1a07ab RW |
124 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
125 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
126 | /* Delete deva from dpm_list and reinsert before devb. */ |
127 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
128 | } | |
129 | ||
130 | /** | |
20d652d7 RW |
131 | * device_pm_move_after - 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 after. | |
ffa6a705 CH |
134 | */ |
135 | void device_pm_move_after(struct device *deva, struct device *devb) | |
136 | { | |
137 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
5c1a07ab RW |
138 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
139 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
140 | /* Delete deva from dpm_list and reinsert after devb. */ |
141 | list_move(&deva->power.entry, &devb->power.entry); | |
142 | } | |
143 | ||
144 | /** | |
20d652d7 RW |
145 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
146 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
147 | */ |
148 | void device_pm_move_last(struct device *dev) | |
149 | { | |
150 | pr_debug("PM: Moving %s:%s to end of list\n", | |
5c1a07ab | 151 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
ffa6a705 CH |
152 | list_move_tail(&dev->power.entry, &dpm_list); |
153 | } | |
154 | ||
875ab0b7 RW |
155 | static ktime_t initcall_debug_start(struct device *dev) |
156 | { | |
157 | ktime_t calltime = ktime_set(0, 0); | |
158 | ||
159 | if (initcall_debug) { | |
160 | pr_info("calling %s+ @ %i\n", | |
161 | dev_name(dev), task_pid_nr(current)); | |
162 | calltime = ktime_get(); | |
163 | } | |
164 | ||
165 | return calltime; | |
166 | } | |
167 | ||
168 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
169 | int error) | |
170 | { | |
171 | ktime_t delta, rettime; | |
172 | ||
173 | if (initcall_debug) { | |
174 | rettime = ktime_get(); | |
175 | delta = ktime_sub(rettime, calltime); | |
176 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), | |
177 | error, (unsigned long long)ktime_to_ns(delta) >> 10); | |
178 | } | |
179 | } | |
180 | ||
5af84b82 RW |
181 | /** |
182 | * dpm_wait - Wait for a PM operation to complete. | |
183 | * @dev: Device to wait for. | |
184 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
185 | */ | |
186 | static void dpm_wait(struct device *dev, bool async) | |
187 | { | |
188 | if (!dev) | |
189 | return; | |
190 | ||
0e06b4a8 | 191 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
192 | wait_for_completion(&dev->power.completion); |
193 | } | |
194 | ||
195 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
196 | { | |
197 | dpm_wait(dev, *((bool *)async_ptr)); | |
198 | return 0; | |
199 | } | |
200 | ||
201 | static void dpm_wait_for_children(struct device *dev, bool async) | |
202 | { | |
203 | device_for_each_child(dev, &async, dpm_wait_fn); | |
204 | } | |
205 | ||
1eede070 | 206 | /** |
20d652d7 RW |
207 | * pm_op - Execute the PM operation appropriate for given PM event. |
208 | * @dev: Device to handle. | |
209 | * @ops: PM operations to choose from. | |
210 | * @state: PM transition of the system being carried out. | |
1eede070 | 211 | */ |
d9ab7716 DT |
212 | static int pm_op(struct device *dev, |
213 | const struct dev_pm_ops *ops, | |
214 | pm_message_t state) | |
1eede070 RW |
215 | { |
216 | int error = 0; | |
875ab0b7 | 217 | ktime_t calltime; |
f2511774 | 218 | |
875ab0b7 | 219 | calltime = initcall_debug_start(dev); |
1eede070 RW |
220 | |
221 | switch (state.event) { | |
222 | #ifdef CONFIG_SUSPEND | |
223 | case PM_EVENT_SUSPEND: | |
224 | if (ops->suspend) { | |
225 | error = ops->suspend(dev); | |
226 | suspend_report_result(ops->suspend, error); | |
227 | } | |
228 | break; | |
229 | case PM_EVENT_RESUME: | |
230 | if (ops->resume) { | |
231 | error = ops->resume(dev); | |
232 | suspend_report_result(ops->resume, error); | |
233 | } | |
234 | break; | |
235 | #endif /* CONFIG_SUSPEND */ | |
236 | #ifdef CONFIG_HIBERNATION | |
237 | case PM_EVENT_FREEZE: | |
238 | case PM_EVENT_QUIESCE: | |
239 | if (ops->freeze) { | |
240 | error = ops->freeze(dev); | |
241 | suspend_report_result(ops->freeze, error); | |
242 | } | |
243 | break; | |
244 | case PM_EVENT_HIBERNATE: | |
245 | if (ops->poweroff) { | |
246 | error = ops->poweroff(dev); | |
247 | suspend_report_result(ops->poweroff, error); | |
248 | } | |
249 | break; | |
250 | case PM_EVENT_THAW: | |
251 | case PM_EVENT_RECOVER: | |
252 | if (ops->thaw) { | |
253 | error = ops->thaw(dev); | |
254 | suspend_report_result(ops->thaw, error); | |
255 | } | |
256 | break; | |
257 | case PM_EVENT_RESTORE: | |
258 | if (ops->restore) { | |
259 | error = ops->restore(dev); | |
260 | suspend_report_result(ops->restore, error); | |
261 | } | |
262 | break; | |
263 | #endif /* CONFIG_HIBERNATION */ | |
264 | default: | |
265 | error = -EINVAL; | |
266 | } | |
f2511774 | 267 | |
875ab0b7 | 268 | initcall_debug_report(dev, calltime, error); |
f2511774 | 269 | |
1eede070 RW |
270 | return error; |
271 | } | |
272 | ||
273 | /** | |
20d652d7 RW |
274 | * pm_noirq_op - Execute the PM operation appropriate for given PM event. |
275 | * @dev: Device to handle. | |
276 | * @ops: PM operations to choose from. | |
277 | * @state: PM transition of the system being carried out. | |
1eede070 | 278 | * |
20d652d7 RW |
279 | * The driver of @dev will not receive interrupts while this function is being |
280 | * executed. | |
1eede070 | 281 | */ |
d9ab7716 DT |
282 | static int pm_noirq_op(struct device *dev, |
283 | const struct dev_pm_ops *ops, | |
1eede070 RW |
284 | pm_message_t state) |
285 | { | |
286 | int error = 0; | |
2cbb3ce1 | 287 | ktime_t calltime = ktime_set(0, 0), delta, rettime; |
f2511774 AV |
288 | |
289 | if (initcall_debug) { | |
8cc6b39f RW |
290 | pr_info("calling %s+ @ %i, parent: %s\n", |
291 | dev_name(dev), task_pid_nr(current), | |
292 | dev->parent ? dev_name(dev->parent) : "none"); | |
f2511774 AV |
293 | calltime = ktime_get(); |
294 | } | |
1eede070 RW |
295 | |
296 | switch (state.event) { | |
297 | #ifdef CONFIG_SUSPEND | |
298 | case PM_EVENT_SUSPEND: | |
299 | if (ops->suspend_noirq) { | |
300 | error = ops->suspend_noirq(dev); | |
301 | suspend_report_result(ops->suspend_noirq, error); | |
302 | } | |
303 | break; | |
304 | case PM_EVENT_RESUME: | |
305 | if (ops->resume_noirq) { | |
306 | error = ops->resume_noirq(dev); | |
307 | suspend_report_result(ops->resume_noirq, error); | |
308 | } | |
309 | break; | |
310 | #endif /* CONFIG_SUSPEND */ | |
311 | #ifdef CONFIG_HIBERNATION | |
312 | case PM_EVENT_FREEZE: | |
313 | case PM_EVENT_QUIESCE: | |
314 | if (ops->freeze_noirq) { | |
315 | error = ops->freeze_noirq(dev); | |
316 | suspend_report_result(ops->freeze_noirq, error); | |
317 | } | |
318 | break; | |
319 | case PM_EVENT_HIBERNATE: | |
320 | if (ops->poweroff_noirq) { | |
321 | error = ops->poweroff_noirq(dev); | |
322 | suspend_report_result(ops->poweroff_noirq, error); | |
323 | } | |
324 | break; | |
325 | case PM_EVENT_THAW: | |
326 | case PM_EVENT_RECOVER: | |
327 | if (ops->thaw_noirq) { | |
328 | error = ops->thaw_noirq(dev); | |
329 | suspend_report_result(ops->thaw_noirq, error); | |
330 | } | |
331 | break; | |
332 | case PM_EVENT_RESTORE: | |
333 | if (ops->restore_noirq) { | |
334 | error = ops->restore_noirq(dev); | |
335 | suspend_report_result(ops->restore_noirq, error); | |
336 | } | |
337 | break; | |
338 | #endif /* CONFIG_HIBERNATION */ | |
339 | default: | |
340 | error = -EINVAL; | |
341 | } | |
f2511774 AV |
342 | |
343 | if (initcall_debug) { | |
344 | rettime = ktime_get(); | |
345 | delta = ktime_sub(rettime, calltime); | |
875ab0b7 RW |
346 | printk("initcall %s_i+ returned %d after %Ld usecs\n", |
347 | dev_name(dev), error, | |
348 | (unsigned long long)ktime_to_ns(delta) >> 10); | |
f2511774 AV |
349 | } |
350 | ||
1eede070 RW |
351 | return error; |
352 | } | |
353 | ||
354 | static char *pm_verb(int event) | |
355 | { | |
356 | switch (event) { | |
357 | case PM_EVENT_SUSPEND: | |
358 | return "suspend"; | |
359 | case PM_EVENT_RESUME: | |
360 | return "resume"; | |
361 | case PM_EVENT_FREEZE: | |
362 | return "freeze"; | |
363 | case PM_EVENT_QUIESCE: | |
364 | return "quiesce"; | |
365 | case PM_EVENT_HIBERNATE: | |
366 | return "hibernate"; | |
367 | case PM_EVENT_THAW: | |
368 | return "thaw"; | |
369 | case PM_EVENT_RESTORE: | |
370 | return "restore"; | |
371 | case PM_EVENT_RECOVER: | |
372 | return "recover"; | |
373 | default: | |
374 | return "(unknown PM event)"; | |
375 | } | |
376 | } | |
377 | ||
378 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) | |
379 | { | |
380 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
381 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
382 | ", may wakeup" : ""); | |
383 | } | |
384 | ||
385 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
386 | int error) | |
387 | { | |
388 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
5c1a07ab | 389 | dev_name(dev), pm_verb(state.event), info, error); |
1eede070 RW |
390 | } |
391 | ||
ecf762b2 RW |
392 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
393 | { | |
394 | ktime_t calltime; | |
0702d9ee | 395 | u64 usecs64; |
ecf762b2 RW |
396 | int usecs; |
397 | ||
398 | calltime = ktime_get(); | |
399 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
400 | do_div(usecs64, NSEC_PER_USEC); | |
401 | usecs = usecs64; | |
402 | if (usecs == 0) | |
403 | usecs = 1; | |
404 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
405 | info ?: "", info ? " " : "", pm_verb(state.event), | |
406 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
407 | } | |
408 | ||
cd59abfc AS |
409 | /*------------------------- Resume routines -------------------------*/ |
410 | ||
411 | /** | |
20d652d7 RW |
412 | * device_resume_noirq - Execute an "early resume" callback for given device. |
413 | * @dev: Device to handle. | |
414 | * @state: PM transition of the system being carried out. | |
cd59abfc | 415 | * |
20d652d7 RW |
416 | * The driver of @dev will not receive interrupts while this function is being |
417 | * executed. | |
cd59abfc | 418 | */ |
d1616302 | 419 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
cd59abfc AS |
420 | { |
421 | int error = 0; | |
422 | ||
423 | TRACE_DEVICE(dev); | |
424 | TRACE_RESUME(0); | |
425 | ||
33c33740 | 426 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
427 | pm_dev_dbg(dev, state, "EARLY "); |
428 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
e7176a37 DB |
429 | if (error) |
430 | goto End; | |
775b64d2 | 431 | } |
33c33740 | 432 | |
e7176a37 DB |
433 | if (dev->type && dev->type->pm) { |
434 | pm_dev_dbg(dev, state, "EARLY type "); | |
435 | error = pm_noirq_op(dev, dev->type->pm, state); | |
436 | if (error) | |
437 | goto End; | |
438 | } | |
439 | ||
440 | if (dev->class && dev->class->pm) { | |
441 | pm_dev_dbg(dev, state, "EARLY class "); | |
442 | error = pm_noirq_op(dev, dev->class->pm, state); | |
443 | } | |
444 | ||
445 | End: | |
775b64d2 RW |
446 | TRACE_RESUME(error); |
447 | return error; | |
448 | } | |
449 | ||
450 | /** | |
20d652d7 RW |
451 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
452 | * @state: PM transition of the system being carried out. | |
775b64d2 | 453 | * |
20d652d7 RW |
454 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
455 | * enable device drivers to receive interrupts. | |
775b64d2 | 456 | */ |
d1616302 | 457 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 458 | { |
ecf762b2 | 459 | ktime_t starttime = ktime_get(); |
775b64d2 | 460 | |
32bdfac5 | 461 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
462 | while (!list_empty(&dpm_noirq_list)) { |
463 | struct device *dev = to_device(dpm_noirq_list.next); | |
5b219a51 | 464 | int error; |
d08a5ace RW |
465 | |
466 | get_device(dev); | |
5b219a51 RW |
467 | list_move_tail(&dev->power.entry, &dpm_suspended_list); |
468 | mutex_unlock(&dpm_list_mtx); | |
d08a5ace | 469 | |
5b219a51 RW |
470 | error = device_resume_noirq(dev, state); |
471 | if (error) | |
472 | pm_dev_err(dev, state, " early", error); | |
d08a5ace | 473 | |
5b219a51 | 474 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
475 | put_device(dev); |
476 | } | |
32bdfac5 | 477 | mutex_unlock(&dpm_list_mtx); |
ecf762b2 | 478 | dpm_show_time(starttime, state, "early"); |
2ed8d2b3 | 479 | resume_device_irqs(); |
775b64d2 | 480 | } |
d1616302 | 481 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
775b64d2 | 482 | |
875ab0b7 RW |
483 | /** |
484 | * legacy_resume - Execute a legacy (bus or class) resume callback for device. | |
0a884223 RD |
485 | * @dev: Device to resume. |
486 | * @cb: Resume callback to execute. | |
875ab0b7 RW |
487 | */ |
488 | static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) | |
489 | { | |
490 | int error; | |
491 | ktime_t calltime; | |
492 | ||
493 | calltime = initcall_debug_start(dev); | |
494 | ||
495 | error = cb(dev); | |
496 | suspend_report_result(cb, error); | |
497 | ||
498 | initcall_debug_report(dev, calltime, error); | |
499 | ||
500 | return error; | |
501 | } | |
502 | ||
775b64d2 | 503 | /** |
97df8c12 | 504 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
505 | * @dev: Device to handle. |
506 | * @state: PM transition of the system being carried out. | |
5af84b82 | 507 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 508 | */ |
97df8c12 | 509 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 RW |
510 | { |
511 | int error = 0; | |
512 | ||
513 | TRACE_DEVICE(dev); | |
514 | TRACE_RESUME(0); | |
cd59abfc | 515 | |
5af84b82 | 516 | dpm_wait(dev->parent, async); |
8e9394ce | 517 | device_lock(dev); |
7a8d37a3 | 518 | |
b8c76f6a | 519 | dev->power.in_suspend = false; |
97df8c12 | 520 | |
1eede070 RW |
521 | if (dev->bus) { |
522 | if (dev->bus->pm) { | |
523 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 524 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
525 | } else if (dev->bus->resume) { |
526 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 527 | error = legacy_resume(dev, dev->bus->resume); |
1eede070 RW |
528 | } |
529 | if (error) | |
530 | goto End; | |
cd59abfc AS |
531 | } |
532 | ||
1eede070 RW |
533 | if (dev->type) { |
534 | if (dev->type->pm) { | |
535 | pm_dev_dbg(dev, state, "type "); | |
536 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
537 | } |
538 | if (error) | |
539 | goto End; | |
cd59abfc AS |
540 | } |
541 | ||
1eede070 RW |
542 | if (dev->class) { |
543 | if (dev->class->pm) { | |
544 | pm_dev_dbg(dev, state, "class "); | |
545 | error = pm_op(dev, dev->class->pm, state); | |
546 | } else if (dev->class->resume) { | |
547 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 548 | error = legacy_resume(dev, dev->class->resume); |
1eede070 | 549 | } |
cd59abfc | 550 | } |
1eede070 | 551 | End: |
8e9394ce | 552 | device_unlock(dev); |
5af84b82 | 553 | complete_all(&dev->power.completion); |
7a8d37a3 | 554 | |
cd59abfc AS |
555 | TRACE_RESUME(error); |
556 | return error; | |
557 | } | |
558 | ||
5af84b82 RW |
559 | static void async_resume(void *data, async_cookie_t cookie) |
560 | { | |
561 | struct device *dev = (struct device *)data; | |
562 | int error; | |
563 | ||
97df8c12 | 564 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
565 | if (error) |
566 | pm_dev_err(dev, pm_transition, " async", error); | |
567 | put_device(dev); | |
568 | } | |
569 | ||
97df8c12 | 570 | static bool is_async(struct device *dev) |
5af84b82 | 571 | { |
97df8c12 RW |
572 | return dev->power.async_suspend && pm_async_enabled |
573 | && !pm_trace_is_enabled(); | |
5af84b82 RW |
574 | } |
575 | ||
775b64d2 | 576 | /** |
20d652d7 RW |
577 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
578 | * @state: PM transition of the system being carried out. | |
775b64d2 | 579 | * |
20d652d7 RW |
580 | * Execute the appropriate "resume" callback for all devices whose status |
581 | * indicates that they are suspended. | |
1eede070 RW |
582 | */ |
583 | static void dpm_resume(pm_message_t state) | |
584 | { | |
97df8c12 | 585 | struct device *dev; |
ecf762b2 | 586 | ktime_t starttime = ktime_get(); |
1eede070 | 587 | |
1eede070 | 588 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 589 | pm_transition = state; |
098dff73 | 590 | async_error = 0; |
1eede070 | 591 | |
8a43a9ab | 592 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
97df8c12 RW |
593 | INIT_COMPLETION(dev->power.completion); |
594 | if (is_async(dev)) { | |
595 | get_device(dev); | |
596 | async_schedule(async_resume, dev); | |
597 | } | |
598 | } | |
599 | ||
8a43a9ab RW |
600 | while (!list_empty(&dpm_suspended_list)) { |
601 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 602 | get_device(dev); |
5b219a51 | 603 | if (!is_async(dev)) { |
1eede070 RW |
604 | int error; |
605 | ||
1eede070 RW |
606 | mutex_unlock(&dpm_list_mtx); |
607 | ||
97df8c12 | 608 | error = device_resume(dev, state, false); |
1eede070 RW |
609 | if (error) |
610 | pm_dev_err(dev, state, "", error); | |
5b219a51 RW |
611 | |
612 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
613 | } |
614 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 615 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
616 | put_device(dev); |
617 | } | |
1eede070 | 618 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 619 | async_synchronize_full(); |
ecf762b2 | 620 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
621 | } |
622 | ||
623 | /** | |
20d652d7 RW |
624 | * device_complete - Complete a PM transition for given device. |
625 | * @dev: Device to handle. | |
626 | * @state: PM transition of the system being carried out. | |
1eede070 | 627 | */ |
d1616302 | 628 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 629 | { |
8e9394ce | 630 | device_lock(dev); |
1eede070 RW |
631 | |
632 | if (dev->class && dev->class->pm && dev->class->pm->complete) { | |
633 | pm_dev_dbg(dev, state, "completing class "); | |
634 | dev->class->pm->complete(dev); | |
635 | } | |
636 | ||
637 | if (dev->type && dev->type->pm && dev->type->pm->complete) { | |
638 | pm_dev_dbg(dev, state, "completing type "); | |
639 | dev->type->pm->complete(dev); | |
640 | } | |
641 | ||
adf09493 | 642 | if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { |
1eede070 | 643 | pm_dev_dbg(dev, state, "completing "); |
adf09493 | 644 | dev->bus->pm->complete(dev); |
1eede070 RW |
645 | } |
646 | ||
8e9394ce | 647 | device_unlock(dev); |
1eede070 RW |
648 | } |
649 | ||
650 | /** | |
20d652d7 RW |
651 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
652 | * @state: PM transition of the system being carried out. | |
775b64d2 | 653 | * |
20d652d7 RW |
654 | * Execute the ->complete() callbacks for all devices whose PM status is not |
655 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 656 | */ |
1eede070 | 657 | static void dpm_complete(pm_message_t state) |
cd59abfc | 658 | { |
1eede070 RW |
659 | struct list_head list; |
660 | ||
661 | INIT_LIST_HEAD(&list); | |
cd59abfc | 662 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
663 | while (!list_empty(&dpm_prepared_list)) { |
664 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 665 | |
1eede070 | 666 | get_device(dev); |
b8c76f6a | 667 | dev->power.in_suspend = false; |
5b219a51 RW |
668 | list_move(&dev->power.entry, &list); |
669 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 670 | |
5b219a51 RW |
671 | device_complete(dev, state); |
672 | pm_runtime_put_sync(dev); | |
1eede070 | 673 | |
5b219a51 | 674 | mutex_lock(&dpm_list_mtx); |
1eede070 | 675 | put_device(dev); |
cd59abfc | 676 | } |
1eede070 | 677 | list_splice(&list, &dpm_list); |
cd59abfc AS |
678 | mutex_unlock(&dpm_list_mtx); |
679 | } | |
680 | ||
cd59abfc | 681 | /** |
20d652d7 RW |
682 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
683 | * @state: PM transition of the system being carried out. | |
cd59abfc | 684 | * |
20d652d7 RW |
685 | * Execute "resume" callbacks for all devices and complete the PM transition of |
686 | * the system. | |
cd59abfc | 687 | */ |
d1616302 | 688 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 689 | { |
775b64d2 | 690 | might_sleep(); |
1eede070 RW |
691 | dpm_resume(state); |
692 | dpm_complete(state); | |
cd59abfc | 693 | } |
d1616302 | 694 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
695 | |
696 | ||
697 | /*------------------------- Suspend routines -------------------------*/ | |
698 | ||
1eede070 | 699 | /** |
20d652d7 RW |
700 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
701 | * @sleep_state: PM message representing a sleep state. | |
702 | * | |
703 | * Return a PM message representing the resume event corresponding to given | |
704 | * sleep state. | |
1eede070 RW |
705 | */ |
706 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 707 | { |
1eede070 RW |
708 | switch (sleep_state.event) { |
709 | case PM_EVENT_SUSPEND: | |
710 | return PMSG_RESUME; | |
711 | case PM_EVENT_FREEZE: | |
712 | case PM_EVENT_QUIESCE: | |
713 | return PMSG_RECOVER; | |
714 | case PM_EVENT_HIBERNATE: | |
715 | return PMSG_RESTORE; | |
cd59abfc | 716 | } |
1eede070 | 717 | return PMSG_ON; |
cd59abfc AS |
718 | } |
719 | ||
720 | /** | |
20d652d7 RW |
721 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
722 | * @dev: Device to handle. | |
723 | * @state: PM transition of the system being carried out. | |
775b64d2 | 724 | * |
20d652d7 RW |
725 | * The driver of @dev will not receive interrupts while this function is being |
726 | * executed. | |
cd59abfc | 727 | */ |
d1616302 | 728 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 RW |
729 | { |
730 | int error = 0; | |
cd59abfc | 731 | |
e7176a37 DB |
732 | if (dev->class && dev->class->pm) { |
733 | pm_dev_dbg(dev, state, "LATE class "); | |
734 | error = pm_noirq_op(dev, dev->class->pm, state); | |
735 | if (error) | |
736 | goto End; | |
737 | } | |
738 | ||
739 | if (dev->type && dev->type->pm) { | |
740 | pm_dev_dbg(dev, state, "LATE type "); | |
741 | error = pm_noirq_op(dev, dev->type->pm, state); | |
742 | if (error) | |
743 | goto End; | |
744 | } | |
745 | ||
33c33740 | 746 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
747 | pm_dev_dbg(dev, state, "LATE "); |
748 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
775b64d2 | 749 | } |
e7176a37 DB |
750 | |
751 | End: | |
775b64d2 RW |
752 | return error; |
753 | } | |
754 | ||
755 | /** | |
20d652d7 RW |
756 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
757 | * @state: PM transition of the system being carried out. | |
775b64d2 | 758 | * |
20d652d7 RW |
759 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
760 | * handlers for all non-sysdev devices. | |
775b64d2 | 761 | */ |
d1616302 | 762 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 763 | { |
ecf762b2 | 764 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
765 | int error = 0; |
766 | ||
2ed8d2b3 | 767 | suspend_device_irqs(); |
32bdfac5 | 768 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
769 | while (!list_empty(&dpm_suspended_list)) { |
770 | struct device *dev = to_device(dpm_suspended_list.prev); | |
d08a5ace RW |
771 | |
772 | get_device(dev); | |
773 | mutex_unlock(&dpm_list_mtx); | |
774 | ||
d1616302 | 775 | error = device_suspend_noirq(dev, state); |
d08a5ace RW |
776 | |
777 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 778 | if (error) { |
1eede070 | 779 | pm_dev_err(dev, state, " late", error); |
d08a5ace | 780 | put_device(dev); |
775b64d2 RW |
781 | break; |
782 | } | |
d08a5ace | 783 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 784 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 785 | put_device(dev); |
775b64d2 | 786 | } |
32bdfac5 | 787 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 788 | if (error) |
d1616302 | 789 | dpm_resume_noirq(resume_event(state)); |
ecf762b2 RW |
790 | else |
791 | dpm_show_time(starttime, state, "late"); | |
775b64d2 RW |
792 | return error; |
793 | } | |
d1616302 | 794 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
775b64d2 | 795 | |
875ab0b7 RW |
796 | /** |
797 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
798 | * @dev: Device to suspend. |
799 | * @state: PM transition of the system being carried out. | |
800 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
801 | */ |
802 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
803 | int (*cb)(struct device *dev, pm_message_t state)) | |
804 | { | |
805 | int error; | |
806 | ktime_t calltime; | |
807 | ||
808 | calltime = initcall_debug_start(dev); | |
809 | ||
810 | error = cb(dev, state); | |
811 | suspend_report_result(cb, error); | |
812 | ||
813 | initcall_debug_report(dev, calltime, error); | |
814 | ||
815 | return error; | |
816 | } | |
817 | ||
775b64d2 | 818 | /** |
20d652d7 RW |
819 | * device_suspend - Execute "suspend" callbacks for given device. |
820 | * @dev: Device to handle. | |
821 | * @state: PM transition of the system being carried out. | |
5af84b82 | 822 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 823 | */ |
5af84b82 | 824 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc AS |
825 | { |
826 | int error = 0; | |
827 | ||
5af84b82 | 828 | dpm_wait_for_children(dev, async); |
8e9394ce | 829 | device_lock(dev); |
7a8d37a3 | 830 | |
5af84b82 RW |
831 | if (async_error) |
832 | goto End; | |
833 | ||
d83f905e RW |
834 | if (pm_wakeup_pending()) { |
835 | async_error = -EBUSY; | |
836 | goto End; | |
837 | } | |
838 | ||
1eede070 RW |
839 | if (dev->class) { |
840 | if (dev->class->pm) { | |
841 | pm_dev_dbg(dev, state, "class "); | |
842 | error = pm_op(dev, dev->class->pm, state); | |
843 | } else if (dev->class->suspend) { | |
844 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 845 | error = legacy_suspend(dev, state, dev->class->suspend); |
1eede070 RW |
846 | } |
847 | if (error) | |
848 | goto End; | |
cd59abfc AS |
849 | } |
850 | ||
1eede070 RW |
851 | if (dev->type) { |
852 | if (dev->type->pm) { | |
853 | pm_dev_dbg(dev, state, "type "); | |
854 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
855 | } |
856 | if (error) | |
857 | goto End; | |
cd59abfc AS |
858 | } |
859 | ||
1eede070 RW |
860 | if (dev->bus) { |
861 | if (dev->bus->pm) { | |
862 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 863 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
864 | } else if (dev->bus->suspend) { |
865 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 866 | error = legacy_suspend(dev, state, dev->bus->suspend); |
1eede070 | 867 | } |
cd59abfc | 868 | } |
5af84b82 | 869 | |
1eede070 | 870 | End: |
8e9394ce | 871 | device_unlock(dev); |
5af84b82 | 872 | complete_all(&dev->power.completion); |
7a8d37a3 | 873 | |
098dff73 RW |
874 | if (error) |
875 | async_error = error; | |
876 | ||
cd59abfc AS |
877 | return error; |
878 | } | |
879 | ||
5af84b82 RW |
880 | static void async_suspend(void *data, async_cookie_t cookie) |
881 | { | |
882 | struct device *dev = (struct device *)data; | |
883 | int error; | |
884 | ||
885 | error = __device_suspend(dev, pm_transition, true); | |
098dff73 | 886 | if (error) |
5af84b82 | 887 | pm_dev_err(dev, pm_transition, " async", error); |
5af84b82 RW |
888 | |
889 | put_device(dev); | |
890 | } | |
891 | ||
892 | static int device_suspend(struct device *dev) | |
893 | { | |
894 | INIT_COMPLETION(dev->power.completion); | |
895 | ||
0e06b4a8 | 896 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
897 | get_device(dev); |
898 | async_schedule(async_suspend, dev); | |
899 | return 0; | |
900 | } | |
901 | ||
902 | return __device_suspend(dev, pm_transition, false); | |
903 | } | |
904 | ||
cd59abfc | 905 | /** |
20d652d7 RW |
906 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
907 | * @state: PM transition of the system being carried out. | |
cd59abfc | 908 | */ |
775b64d2 | 909 | static int dpm_suspend(pm_message_t state) |
cd59abfc | 910 | { |
ecf762b2 | 911 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
912 | int error = 0; |
913 | ||
cd59abfc | 914 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
915 | pm_transition = state; |
916 | async_error = 0; | |
8a43a9ab RW |
917 | while (!list_empty(&dpm_prepared_list)) { |
918 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 919 | |
1eede070 | 920 | get_device(dev); |
cd59abfc | 921 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 922 | |
5af84b82 | 923 | error = device_suspend(dev); |
1eede070 | 924 | |
1b3cbec1 | 925 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 926 | if (error) { |
1eede070 RW |
927 | pm_dev_err(dev, state, "", error); |
928 | put_device(dev); | |
775b64d2 RW |
929 | break; |
930 | } | |
7a8d37a3 | 931 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 932 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 933 | put_device(dev); |
5af84b82 RW |
934 | if (async_error) |
935 | break; | |
cd59abfc AS |
936 | } |
937 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
938 | async_synchronize_full(); |
939 | if (!error) | |
940 | error = async_error; | |
ecf762b2 RW |
941 | if (!error) |
942 | dpm_show_time(starttime, state, NULL); | |
1eede070 RW |
943 | return error; |
944 | } | |
945 | ||
946 | /** | |
20d652d7 RW |
947 | * device_prepare - Prepare a device for system power transition. |
948 | * @dev: Device to handle. | |
949 | * @state: PM transition of the system being carried out. | |
950 | * | |
951 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
952 | * device may be registered after this function has returned. | |
1eede070 | 953 | */ |
d1616302 | 954 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 RW |
955 | { |
956 | int error = 0; | |
957 | ||
8e9394ce | 958 | device_lock(dev); |
1eede070 | 959 | |
adf09493 | 960 | if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { |
1eede070 | 961 | pm_dev_dbg(dev, state, "preparing "); |
adf09493 RW |
962 | error = dev->bus->pm->prepare(dev); |
963 | suspend_report_result(dev->bus->pm->prepare, error); | |
1eede070 RW |
964 | if (error) |
965 | goto End; | |
966 | } | |
967 | ||
968 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { | |
969 | pm_dev_dbg(dev, state, "preparing type "); | |
970 | error = dev->type->pm->prepare(dev); | |
971 | suspend_report_result(dev->type->pm->prepare, error); | |
972 | if (error) | |
973 | goto End; | |
974 | } | |
975 | ||
976 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { | |
977 | pm_dev_dbg(dev, state, "preparing class "); | |
978 | error = dev->class->pm->prepare(dev); | |
979 | suspend_report_result(dev->class->pm->prepare, error); | |
980 | } | |
981 | End: | |
8e9394ce | 982 | device_unlock(dev); |
1eede070 RW |
983 | |
984 | return error; | |
985 | } | |
cd59abfc | 986 | |
1eede070 | 987 | /** |
20d652d7 RW |
988 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
989 | * @state: PM transition of the system being carried out. | |
1eede070 | 990 | * |
20d652d7 | 991 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 RW |
992 | */ |
993 | static int dpm_prepare(pm_message_t state) | |
994 | { | |
1eede070 RW |
995 | int error = 0; |
996 | ||
1eede070 | 997 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
998 | while (!list_empty(&dpm_list)) { |
999 | struct device *dev = to_device(dpm_list.next); | |
1000 | ||
1001 | get_device(dev); | |
1eede070 RW |
1002 | mutex_unlock(&dpm_list_mtx); |
1003 | ||
5e928f77 | 1004 | pm_runtime_get_noresume(dev); |
1e75227e RW |
1005 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1006 | pm_wakeup_event(dev, 0); | |
1007 | ||
a2867e08 | 1008 | if (pm_wakeup_pending()) { |
aa0baaef | 1009 | pm_runtime_put_sync(dev); |
5e928f77 RW |
1010 | error = -EBUSY; |
1011 | } else { | |
1012 | error = device_prepare(dev, state); | |
1013 | } | |
1eede070 RW |
1014 | |
1015 | mutex_lock(&dpm_list_mtx); | |
1016 | if (error) { | |
1eede070 RW |
1017 | if (error == -EAGAIN) { |
1018 | put_device(dev); | |
886a7a33 | 1019 | error = 0; |
1eede070 RW |
1020 | continue; |
1021 | } | |
1e75227e RW |
1022 | printk(KERN_INFO "PM: Device %s not prepared " |
1023 | "for power transition: code %d\n", | |
5c1a07ab | 1024 | dev_name(dev), error); |
1eede070 RW |
1025 | put_device(dev); |
1026 | break; | |
1027 | } | |
b8c76f6a | 1028 | dev->power.in_suspend = true; |
1eede070 | 1029 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1030 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1031 | put_device(dev); |
1032 | } | |
1eede070 | 1033 | mutex_unlock(&dpm_list_mtx); |
cd59abfc AS |
1034 | return error; |
1035 | } | |
1036 | ||
775b64d2 | 1037 | /** |
20d652d7 RW |
1038 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1039 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1040 | * |
20d652d7 RW |
1041 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1042 | * callbacks for them. | |
775b64d2 | 1043 | */ |
d1616302 | 1044 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1045 | { |
1046 | int error; | |
cd59abfc | 1047 | |
775b64d2 | 1048 | might_sleep(); |
1eede070 RW |
1049 | error = dpm_prepare(state); |
1050 | if (!error) | |
1051 | error = dpm_suspend(state); | |
cd59abfc | 1052 | return error; |
cd59abfc | 1053 | } |
d1616302 | 1054 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1055 | |
1056 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1057 | { | |
c80cfb04 BH |
1058 | if (ret) |
1059 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1060 | } |
1061 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1062 | |
1063 | /** | |
1064 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1065 | * @dev: Device to wait for. | |
1066 | * @subordinate: Device that needs to wait for @dev. | |
1067 | */ | |
098dff73 | 1068 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1069 | { |
1070 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1071 | return async_error; |
f8824cee RW |
1072 | } |
1073 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |