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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 | ||
7538e3db RW |
426 | if (dev->pwr_domain) { |
427 | pm_dev_dbg(dev, state, "EARLY power domain "); | |
428 | pm_noirq_op(dev, &dev->pwr_domain->ops, state); | |
429 | } | |
430 | ||
33c33740 | 431 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
432 | pm_dev_dbg(dev, state, "EARLY "); |
433 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
e7176a37 DB |
434 | if (error) |
435 | goto End; | |
775b64d2 | 436 | } |
33c33740 | 437 | |
e7176a37 DB |
438 | if (dev->type && dev->type->pm) { |
439 | pm_dev_dbg(dev, state, "EARLY type "); | |
440 | error = pm_noirq_op(dev, dev->type->pm, state); | |
441 | if (error) | |
442 | goto End; | |
443 | } | |
444 | ||
445 | if (dev->class && dev->class->pm) { | |
446 | pm_dev_dbg(dev, state, "EARLY class "); | |
447 | error = pm_noirq_op(dev, dev->class->pm, state); | |
448 | } | |
449 | ||
450 | End: | |
775b64d2 RW |
451 | TRACE_RESUME(error); |
452 | return error; | |
453 | } | |
454 | ||
455 | /** | |
20d652d7 RW |
456 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
457 | * @state: PM transition of the system being carried out. | |
775b64d2 | 458 | * |
20d652d7 RW |
459 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
460 | * enable device drivers to receive interrupts. | |
775b64d2 | 461 | */ |
d1616302 | 462 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 463 | { |
ecf762b2 | 464 | ktime_t starttime = ktime_get(); |
775b64d2 | 465 | |
32bdfac5 | 466 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
467 | while (!list_empty(&dpm_noirq_list)) { |
468 | struct device *dev = to_device(dpm_noirq_list.next); | |
5b219a51 | 469 | int error; |
d08a5ace RW |
470 | |
471 | get_device(dev); | |
5b219a51 RW |
472 | list_move_tail(&dev->power.entry, &dpm_suspended_list); |
473 | mutex_unlock(&dpm_list_mtx); | |
d08a5ace | 474 | |
5b219a51 RW |
475 | error = device_resume_noirq(dev, state); |
476 | if (error) | |
477 | pm_dev_err(dev, state, " early", error); | |
d08a5ace | 478 | |
5b219a51 | 479 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
480 | put_device(dev); |
481 | } | |
32bdfac5 | 482 | mutex_unlock(&dpm_list_mtx); |
ecf762b2 | 483 | dpm_show_time(starttime, state, "early"); |
2ed8d2b3 | 484 | resume_device_irqs(); |
775b64d2 | 485 | } |
d1616302 | 486 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
775b64d2 | 487 | |
875ab0b7 RW |
488 | /** |
489 | * legacy_resume - Execute a legacy (bus or class) resume callback for device. | |
0a884223 RD |
490 | * @dev: Device to resume. |
491 | * @cb: Resume callback to execute. | |
875ab0b7 RW |
492 | */ |
493 | static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) | |
494 | { | |
495 | int error; | |
496 | ktime_t calltime; | |
497 | ||
498 | calltime = initcall_debug_start(dev); | |
499 | ||
500 | error = cb(dev); | |
501 | suspend_report_result(cb, error); | |
502 | ||
503 | initcall_debug_report(dev, calltime, error); | |
504 | ||
505 | return error; | |
506 | } | |
507 | ||
775b64d2 | 508 | /** |
97df8c12 | 509 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
510 | * @dev: Device to handle. |
511 | * @state: PM transition of the system being carried out. | |
5af84b82 | 512 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 513 | */ |
97df8c12 | 514 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 RW |
515 | { |
516 | int error = 0; | |
517 | ||
518 | TRACE_DEVICE(dev); | |
519 | TRACE_RESUME(0); | |
cd59abfc | 520 | |
5af84b82 | 521 | dpm_wait(dev->parent, async); |
8e9394ce | 522 | device_lock(dev); |
7a8d37a3 | 523 | |
b8c76f6a | 524 | dev->power.in_suspend = false; |
97df8c12 | 525 | |
7538e3db RW |
526 | if (dev->pwr_domain) { |
527 | pm_dev_dbg(dev, state, "power domain "); | |
528 | pm_op(dev, &dev->pwr_domain->ops, state); | |
529 | } | |
530 | ||
1eede070 RW |
531 | if (dev->bus) { |
532 | if (dev->bus->pm) { | |
533 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 534 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
535 | } else if (dev->bus->resume) { |
536 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 537 | error = legacy_resume(dev, dev->bus->resume); |
1eede070 RW |
538 | } |
539 | if (error) | |
540 | goto End; | |
cd59abfc AS |
541 | } |
542 | ||
1eede070 RW |
543 | if (dev->type) { |
544 | if (dev->type->pm) { | |
545 | pm_dev_dbg(dev, state, "type "); | |
546 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
547 | } |
548 | if (error) | |
549 | goto End; | |
cd59abfc AS |
550 | } |
551 | ||
1eede070 RW |
552 | if (dev->class) { |
553 | if (dev->class->pm) { | |
554 | pm_dev_dbg(dev, state, "class "); | |
555 | error = pm_op(dev, dev->class->pm, state); | |
556 | } else if (dev->class->resume) { | |
557 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 558 | error = legacy_resume(dev, dev->class->resume); |
1eede070 | 559 | } |
cd59abfc | 560 | } |
1eede070 | 561 | End: |
8e9394ce | 562 | device_unlock(dev); |
5af84b82 | 563 | complete_all(&dev->power.completion); |
7a8d37a3 | 564 | |
cd59abfc AS |
565 | TRACE_RESUME(error); |
566 | return error; | |
567 | } | |
568 | ||
5af84b82 RW |
569 | static void async_resume(void *data, async_cookie_t cookie) |
570 | { | |
571 | struct device *dev = (struct device *)data; | |
572 | int error; | |
573 | ||
97df8c12 | 574 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
575 | if (error) |
576 | pm_dev_err(dev, pm_transition, " async", error); | |
577 | put_device(dev); | |
578 | } | |
579 | ||
97df8c12 | 580 | static bool is_async(struct device *dev) |
5af84b82 | 581 | { |
97df8c12 RW |
582 | return dev->power.async_suspend && pm_async_enabled |
583 | && !pm_trace_is_enabled(); | |
5af84b82 RW |
584 | } |
585 | ||
775b64d2 | 586 | /** |
20d652d7 RW |
587 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
588 | * @state: PM transition of the system being carried out. | |
775b64d2 | 589 | * |
20d652d7 RW |
590 | * Execute the appropriate "resume" callback for all devices whose status |
591 | * indicates that they are suspended. | |
1eede070 RW |
592 | */ |
593 | static void dpm_resume(pm_message_t state) | |
594 | { | |
97df8c12 | 595 | struct device *dev; |
ecf762b2 | 596 | ktime_t starttime = ktime_get(); |
1eede070 | 597 | |
1eede070 | 598 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 599 | pm_transition = state; |
098dff73 | 600 | async_error = 0; |
1eede070 | 601 | |
8a43a9ab | 602 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
97df8c12 RW |
603 | INIT_COMPLETION(dev->power.completion); |
604 | if (is_async(dev)) { | |
605 | get_device(dev); | |
606 | async_schedule(async_resume, dev); | |
607 | } | |
608 | } | |
609 | ||
8a43a9ab RW |
610 | while (!list_empty(&dpm_suspended_list)) { |
611 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 612 | get_device(dev); |
5b219a51 | 613 | if (!is_async(dev)) { |
1eede070 RW |
614 | int error; |
615 | ||
1eede070 RW |
616 | mutex_unlock(&dpm_list_mtx); |
617 | ||
97df8c12 | 618 | error = device_resume(dev, state, false); |
1eede070 RW |
619 | if (error) |
620 | pm_dev_err(dev, state, "", error); | |
5b219a51 RW |
621 | |
622 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
623 | } |
624 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 625 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
626 | put_device(dev); |
627 | } | |
1eede070 | 628 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 629 | async_synchronize_full(); |
ecf762b2 | 630 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
631 | } |
632 | ||
633 | /** | |
20d652d7 RW |
634 | * device_complete - Complete a PM transition for given device. |
635 | * @dev: Device to handle. | |
636 | * @state: PM transition of the system being carried out. | |
1eede070 | 637 | */ |
d1616302 | 638 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 639 | { |
8e9394ce | 640 | device_lock(dev); |
1eede070 | 641 | |
7538e3db RW |
642 | if (dev->pwr_domain && dev->pwr_domain->ops.complete) { |
643 | pm_dev_dbg(dev, state, "completing power domain "); | |
644 | dev->pwr_domain->ops.complete(dev); | |
645 | } | |
646 | ||
1eede070 RW |
647 | if (dev->class && dev->class->pm && dev->class->pm->complete) { |
648 | pm_dev_dbg(dev, state, "completing class "); | |
649 | dev->class->pm->complete(dev); | |
650 | } | |
651 | ||
652 | if (dev->type && dev->type->pm && dev->type->pm->complete) { | |
653 | pm_dev_dbg(dev, state, "completing type "); | |
654 | dev->type->pm->complete(dev); | |
655 | } | |
656 | ||
adf09493 | 657 | if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { |
1eede070 | 658 | pm_dev_dbg(dev, state, "completing "); |
adf09493 | 659 | dev->bus->pm->complete(dev); |
1eede070 RW |
660 | } |
661 | ||
8e9394ce | 662 | device_unlock(dev); |
1eede070 RW |
663 | } |
664 | ||
665 | /** | |
20d652d7 RW |
666 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
667 | * @state: PM transition of the system being carried out. | |
775b64d2 | 668 | * |
20d652d7 RW |
669 | * Execute the ->complete() callbacks for all devices whose PM status is not |
670 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 671 | */ |
1eede070 | 672 | static void dpm_complete(pm_message_t state) |
cd59abfc | 673 | { |
1eede070 RW |
674 | struct list_head list; |
675 | ||
676 | INIT_LIST_HEAD(&list); | |
cd59abfc | 677 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
678 | while (!list_empty(&dpm_prepared_list)) { |
679 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 680 | |
1eede070 | 681 | get_device(dev); |
b8c76f6a | 682 | dev->power.in_suspend = false; |
5b219a51 RW |
683 | list_move(&dev->power.entry, &list); |
684 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 685 | |
5b219a51 | 686 | device_complete(dev, state); |
1eede070 | 687 | |
5b219a51 | 688 | mutex_lock(&dpm_list_mtx); |
1eede070 | 689 | put_device(dev); |
cd59abfc | 690 | } |
1eede070 | 691 | list_splice(&list, &dpm_list); |
cd59abfc AS |
692 | mutex_unlock(&dpm_list_mtx); |
693 | } | |
694 | ||
cd59abfc | 695 | /** |
20d652d7 RW |
696 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
697 | * @state: PM transition of the system being carried out. | |
cd59abfc | 698 | * |
20d652d7 RW |
699 | * Execute "resume" callbacks for all devices and complete the PM transition of |
700 | * the system. | |
cd59abfc | 701 | */ |
d1616302 | 702 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 703 | { |
775b64d2 | 704 | might_sleep(); |
1eede070 RW |
705 | dpm_resume(state); |
706 | dpm_complete(state); | |
cd59abfc | 707 | } |
d1616302 | 708 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
709 | |
710 | ||
711 | /*------------------------- Suspend routines -------------------------*/ | |
712 | ||
1eede070 | 713 | /** |
20d652d7 RW |
714 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
715 | * @sleep_state: PM message representing a sleep state. | |
716 | * | |
717 | * Return a PM message representing the resume event corresponding to given | |
718 | * sleep state. | |
1eede070 RW |
719 | */ |
720 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 721 | { |
1eede070 RW |
722 | switch (sleep_state.event) { |
723 | case PM_EVENT_SUSPEND: | |
724 | return PMSG_RESUME; | |
725 | case PM_EVENT_FREEZE: | |
726 | case PM_EVENT_QUIESCE: | |
727 | return PMSG_RECOVER; | |
728 | case PM_EVENT_HIBERNATE: | |
729 | return PMSG_RESTORE; | |
cd59abfc | 730 | } |
1eede070 | 731 | return PMSG_ON; |
cd59abfc AS |
732 | } |
733 | ||
734 | /** | |
20d652d7 RW |
735 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
736 | * @dev: Device to handle. | |
737 | * @state: PM transition of the system being carried out. | |
775b64d2 | 738 | * |
20d652d7 RW |
739 | * The driver of @dev will not receive interrupts while this function is being |
740 | * executed. | |
cd59abfc | 741 | */ |
d1616302 | 742 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 RW |
743 | { |
744 | int error = 0; | |
cd59abfc | 745 | |
e7176a37 DB |
746 | if (dev->class && dev->class->pm) { |
747 | pm_dev_dbg(dev, state, "LATE class "); | |
748 | error = pm_noirq_op(dev, dev->class->pm, state); | |
749 | if (error) | |
750 | goto End; | |
751 | } | |
752 | ||
753 | if (dev->type && dev->type->pm) { | |
754 | pm_dev_dbg(dev, state, "LATE type "); | |
755 | error = pm_noirq_op(dev, dev->type->pm, state); | |
756 | if (error) | |
757 | goto End; | |
758 | } | |
759 | ||
33c33740 | 760 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
761 | pm_dev_dbg(dev, state, "LATE "); |
762 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
7538e3db RW |
763 | if (error) |
764 | goto End; | |
765 | } | |
766 | ||
767 | if (dev->pwr_domain) { | |
768 | pm_dev_dbg(dev, state, "LATE power domain "); | |
769 | pm_noirq_op(dev, &dev->pwr_domain->ops, state); | |
775b64d2 | 770 | } |
e7176a37 DB |
771 | |
772 | End: | |
775b64d2 RW |
773 | return error; |
774 | } | |
775 | ||
776 | /** | |
20d652d7 RW |
777 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
778 | * @state: PM transition of the system being carried out. | |
775b64d2 | 779 | * |
20d652d7 RW |
780 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
781 | * handlers for all non-sysdev devices. | |
775b64d2 | 782 | */ |
d1616302 | 783 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 784 | { |
ecf762b2 | 785 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
786 | int error = 0; |
787 | ||
2ed8d2b3 | 788 | suspend_device_irqs(); |
32bdfac5 | 789 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
790 | while (!list_empty(&dpm_suspended_list)) { |
791 | struct device *dev = to_device(dpm_suspended_list.prev); | |
d08a5ace RW |
792 | |
793 | get_device(dev); | |
794 | mutex_unlock(&dpm_list_mtx); | |
795 | ||
d1616302 | 796 | error = device_suspend_noirq(dev, state); |
d08a5ace RW |
797 | |
798 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 799 | if (error) { |
1eede070 | 800 | pm_dev_err(dev, state, " late", error); |
d08a5ace | 801 | put_device(dev); |
775b64d2 RW |
802 | break; |
803 | } | |
d08a5ace | 804 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 805 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 806 | put_device(dev); |
775b64d2 | 807 | } |
32bdfac5 | 808 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 809 | if (error) |
d1616302 | 810 | dpm_resume_noirq(resume_event(state)); |
ecf762b2 RW |
811 | else |
812 | dpm_show_time(starttime, state, "late"); | |
775b64d2 RW |
813 | return error; |
814 | } | |
d1616302 | 815 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
775b64d2 | 816 | |
875ab0b7 RW |
817 | /** |
818 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
819 | * @dev: Device to suspend. |
820 | * @state: PM transition of the system being carried out. | |
821 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
822 | */ |
823 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
824 | int (*cb)(struct device *dev, pm_message_t state)) | |
825 | { | |
826 | int error; | |
827 | ktime_t calltime; | |
828 | ||
829 | calltime = initcall_debug_start(dev); | |
830 | ||
831 | error = cb(dev, state); | |
832 | suspend_report_result(cb, error); | |
833 | ||
834 | initcall_debug_report(dev, calltime, error); | |
835 | ||
836 | return error; | |
837 | } | |
838 | ||
775b64d2 | 839 | /** |
20d652d7 RW |
840 | * device_suspend - Execute "suspend" callbacks for given device. |
841 | * @dev: Device to handle. | |
842 | * @state: PM transition of the system being carried out. | |
5af84b82 | 843 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 844 | */ |
5af84b82 | 845 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc AS |
846 | { |
847 | int error = 0; | |
848 | ||
5af84b82 | 849 | dpm_wait_for_children(dev, async); |
8e9394ce | 850 | device_lock(dev); |
7a8d37a3 | 851 | |
5af84b82 RW |
852 | if (async_error) |
853 | goto End; | |
854 | ||
d83f905e RW |
855 | if (pm_wakeup_pending()) { |
856 | async_error = -EBUSY; | |
857 | goto End; | |
858 | } | |
859 | ||
1eede070 RW |
860 | if (dev->class) { |
861 | if (dev->class->pm) { | |
862 | pm_dev_dbg(dev, state, "class "); | |
863 | error = pm_op(dev, dev->class->pm, state); | |
864 | } else if (dev->class->suspend) { | |
865 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 866 | error = legacy_suspend(dev, state, dev->class->suspend); |
1eede070 RW |
867 | } |
868 | if (error) | |
869 | goto End; | |
cd59abfc AS |
870 | } |
871 | ||
1eede070 RW |
872 | if (dev->type) { |
873 | if (dev->type->pm) { | |
874 | pm_dev_dbg(dev, state, "type "); | |
875 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
876 | } |
877 | if (error) | |
878 | goto End; | |
cd59abfc AS |
879 | } |
880 | ||
1eede070 RW |
881 | if (dev->bus) { |
882 | if (dev->bus->pm) { | |
883 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 884 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
885 | } else if (dev->bus->suspend) { |
886 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 887 | error = legacy_suspend(dev, state, dev->bus->suspend); |
1eede070 | 888 | } |
7538e3db RW |
889 | if (error) |
890 | goto End; | |
891 | } | |
892 | ||
893 | if (dev->pwr_domain) { | |
894 | pm_dev_dbg(dev, state, "power domain "); | |
895 | pm_op(dev, &dev->pwr_domain->ops, state); | |
cd59abfc | 896 | } |
5af84b82 | 897 | |
1eede070 | 898 | End: |
8e9394ce | 899 | device_unlock(dev); |
5af84b82 | 900 | complete_all(&dev->power.completion); |
7a8d37a3 | 901 | |
098dff73 RW |
902 | if (error) |
903 | async_error = error; | |
904 | ||
cd59abfc AS |
905 | return error; |
906 | } | |
907 | ||
5af84b82 RW |
908 | static void async_suspend(void *data, async_cookie_t cookie) |
909 | { | |
910 | struct device *dev = (struct device *)data; | |
911 | int error; | |
912 | ||
913 | error = __device_suspend(dev, pm_transition, true); | |
098dff73 | 914 | if (error) |
5af84b82 | 915 | pm_dev_err(dev, pm_transition, " async", error); |
5af84b82 RW |
916 | |
917 | put_device(dev); | |
918 | } | |
919 | ||
920 | static int device_suspend(struct device *dev) | |
921 | { | |
922 | INIT_COMPLETION(dev->power.completion); | |
923 | ||
0e06b4a8 | 924 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
925 | get_device(dev); |
926 | async_schedule(async_suspend, dev); | |
927 | return 0; | |
928 | } | |
929 | ||
930 | return __device_suspend(dev, pm_transition, false); | |
931 | } | |
932 | ||
cd59abfc | 933 | /** |
20d652d7 RW |
934 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
935 | * @state: PM transition of the system being carried out. | |
cd59abfc | 936 | */ |
775b64d2 | 937 | static int dpm_suspend(pm_message_t state) |
cd59abfc | 938 | { |
ecf762b2 | 939 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
940 | int error = 0; |
941 | ||
cd59abfc | 942 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
943 | pm_transition = state; |
944 | async_error = 0; | |
8a43a9ab RW |
945 | while (!list_empty(&dpm_prepared_list)) { |
946 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 947 | |
1eede070 | 948 | get_device(dev); |
cd59abfc | 949 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 950 | |
5af84b82 | 951 | error = device_suspend(dev); |
1eede070 | 952 | |
1b3cbec1 | 953 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 954 | if (error) { |
1eede070 RW |
955 | pm_dev_err(dev, state, "", error); |
956 | put_device(dev); | |
775b64d2 RW |
957 | break; |
958 | } | |
7a8d37a3 | 959 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 960 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 961 | put_device(dev); |
5af84b82 RW |
962 | if (async_error) |
963 | break; | |
cd59abfc AS |
964 | } |
965 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
966 | async_synchronize_full(); |
967 | if (!error) | |
968 | error = async_error; | |
ecf762b2 RW |
969 | if (!error) |
970 | dpm_show_time(starttime, state, NULL); | |
1eede070 RW |
971 | return error; |
972 | } | |
973 | ||
974 | /** | |
20d652d7 RW |
975 | * device_prepare - Prepare a device for system power transition. |
976 | * @dev: Device to handle. | |
977 | * @state: PM transition of the system being carried out. | |
978 | * | |
979 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
980 | * device may be registered after this function has returned. | |
1eede070 | 981 | */ |
d1616302 | 982 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 RW |
983 | { |
984 | int error = 0; | |
985 | ||
8e9394ce | 986 | device_lock(dev); |
1eede070 | 987 | |
adf09493 | 988 | if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { |
1eede070 | 989 | pm_dev_dbg(dev, state, "preparing "); |
adf09493 RW |
990 | error = dev->bus->pm->prepare(dev); |
991 | suspend_report_result(dev->bus->pm->prepare, error); | |
1eede070 RW |
992 | if (error) |
993 | goto End; | |
994 | } | |
995 | ||
996 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { | |
997 | pm_dev_dbg(dev, state, "preparing type "); | |
998 | error = dev->type->pm->prepare(dev); | |
999 | suspend_report_result(dev->type->pm->prepare, error); | |
1000 | if (error) | |
1001 | goto End; | |
1002 | } | |
1003 | ||
1004 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { | |
1005 | pm_dev_dbg(dev, state, "preparing class "); | |
1006 | error = dev->class->pm->prepare(dev); | |
1007 | suspend_report_result(dev->class->pm->prepare, error); | |
7538e3db RW |
1008 | if (error) |
1009 | goto End; | |
1010 | } | |
1011 | ||
1012 | if (dev->pwr_domain && dev->pwr_domain->ops.prepare) { | |
1013 | pm_dev_dbg(dev, state, "preparing power domain "); | |
1014 | dev->pwr_domain->ops.prepare(dev); | |
1eede070 | 1015 | } |
7538e3db | 1016 | |
1eede070 | 1017 | End: |
8e9394ce | 1018 | device_unlock(dev); |
1eede070 RW |
1019 | |
1020 | return error; | |
1021 | } | |
cd59abfc | 1022 | |
1eede070 | 1023 | /** |
20d652d7 RW |
1024 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1025 | * @state: PM transition of the system being carried out. | |
1eede070 | 1026 | * |
20d652d7 | 1027 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 RW |
1028 | */ |
1029 | static int dpm_prepare(pm_message_t state) | |
1030 | { | |
1eede070 RW |
1031 | int error = 0; |
1032 | ||
1eede070 | 1033 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
1034 | while (!list_empty(&dpm_list)) { |
1035 | struct device *dev = to_device(dpm_list.next); | |
1036 | ||
1037 | get_device(dev); | |
1eede070 RW |
1038 | mutex_unlock(&dpm_list_mtx); |
1039 | ||
5e928f77 | 1040 | pm_runtime_get_noresume(dev); |
1e75227e RW |
1041 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1042 | pm_wakeup_event(dev, 0); | |
1043 | ||
e8665002 RW |
1044 | pm_runtime_put_sync(dev); |
1045 | error = pm_wakeup_pending() ? | |
1046 | -EBUSY : device_prepare(dev, state); | |
1eede070 RW |
1047 | |
1048 | mutex_lock(&dpm_list_mtx); | |
1049 | if (error) { | |
1eede070 RW |
1050 | if (error == -EAGAIN) { |
1051 | put_device(dev); | |
886a7a33 | 1052 | error = 0; |
1eede070 RW |
1053 | continue; |
1054 | } | |
1e75227e RW |
1055 | printk(KERN_INFO "PM: Device %s not prepared " |
1056 | "for power transition: code %d\n", | |
5c1a07ab | 1057 | dev_name(dev), error); |
1eede070 RW |
1058 | put_device(dev); |
1059 | break; | |
1060 | } | |
b8c76f6a | 1061 | dev->power.in_suspend = true; |
1eede070 | 1062 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1063 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1064 | put_device(dev); |
1065 | } | |
1eede070 | 1066 | mutex_unlock(&dpm_list_mtx); |
cd59abfc AS |
1067 | return error; |
1068 | } | |
1069 | ||
775b64d2 | 1070 | /** |
20d652d7 RW |
1071 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1072 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1073 | * |
20d652d7 RW |
1074 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1075 | * callbacks for them. | |
775b64d2 | 1076 | */ |
d1616302 | 1077 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1078 | { |
1079 | int error; | |
cd59abfc | 1080 | |
775b64d2 | 1081 | might_sleep(); |
1eede070 RW |
1082 | error = dpm_prepare(state); |
1083 | if (!error) | |
1084 | error = dpm_suspend(state); | |
cd59abfc | 1085 | return error; |
cd59abfc | 1086 | } |
d1616302 | 1087 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1088 | |
1089 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1090 | { | |
c80cfb04 BH |
1091 | if (ret) |
1092 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1093 | } |
1094 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1095 | |
1096 | /** | |
1097 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1098 | * @dev: Device to wait for. | |
1099 | * @subordinate: Device that needs to wait for @dev. | |
1100 | */ | |
098dff73 | 1101 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1102 | { |
1103 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1104 | return async_error; |
f8824cee RW |
1105 | } |
1106 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |