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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 */ | |
1f112cee | 236 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
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; | |
1f112cee | 263 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 RW |
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 */ | |
1f112cee | 311 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
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; | |
1f112cee | 338 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 RW |
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 | ||
e7176a37 DB |
431 | if (dev->type && dev->type->pm) { |
432 | pm_dev_dbg(dev, state, "EARLY type "); | |
433 | error = pm_noirq_op(dev, dev->type->pm, state); | |
9659cc06 | 434 | } else if (dev->class && dev->class->pm) { |
e7176a37 DB |
435 | pm_dev_dbg(dev, state, "EARLY class "); |
436 | error = pm_noirq_op(dev, dev->class->pm, state); | |
9659cc06 RW |
437 | } else if (dev->bus && dev->bus->pm) { |
438 | pm_dev_dbg(dev, state, "EARLY "); | |
439 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
e7176a37 DB |
440 | } |
441 | ||
775b64d2 RW |
442 | TRACE_RESUME(error); |
443 | return error; | |
444 | } | |
445 | ||
446 | /** | |
20d652d7 RW |
447 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
448 | * @state: PM transition of the system being carried out. | |
775b64d2 | 449 | * |
20d652d7 RW |
450 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
451 | * enable device drivers to receive interrupts. | |
775b64d2 | 452 | */ |
d1616302 | 453 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 454 | { |
ecf762b2 | 455 | ktime_t starttime = ktime_get(); |
775b64d2 | 456 | |
32bdfac5 | 457 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
458 | while (!list_empty(&dpm_noirq_list)) { |
459 | struct device *dev = to_device(dpm_noirq_list.next); | |
5b219a51 | 460 | int error; |
d08a5ace RW |
461 | |
462 | get_device(dev); | |
5b219a51 RW |
463 | list_move_tail(&dev->power.entry, &dpm_suspended_list); |
464 | mutex_unlock(&dpm_list_mtx); | |
d08a5ace | 465 | |
5b219a51 RW |
466 | error = device_resume_noirq(dev, state); |
467 | if (error) | |
468 | pm_dev_err(dev, state, " early", error); | |
d08a5ace | 469 | |
5b219a51 | 470 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
471 | put_device(dev); |
472 | } | |
32bdfac5 | 473 | mutex_unlock(&dpm_list_mtx); |
ecf762b2 | 474 | dpm_show_time(starttime, state, "early"); |
2ed8d2b3 | 475 | resume_device_irqs(); |
775b64d2 | 476 | } |
d1616302 | 477 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
775b64d2 | 478 | |
875ab0b7 RW |
479 | /** |
480 | * legacy_resume - Execute a legacy (bus or class) resume callback for device. | |
0a884223 RD |
481 | * @dev: Device to resume. |
482 | * @cb: Resume callback to execute. | |
875ab0b7 RW |
483 | */ |
484 | static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) | |
485 | { | |
486 | int error; | |
487 | ktime_t calltime; | |
488 | ||
489 | calltime = initcall_debug_start(dev); | |
490 | ||
491 | error = cb(dev); | |
492 | suspend_report_result(cb, error); | |
493 | ||
494 | initcall_debug_report(dev, calltime, error); | |
495 | ||
496 | return error; | |
497 | } | |
498 | ||
775b64d2 | 499 | /** |
97df8c12 | 500 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
501 | * @dev: Device to handle. |
502 | * @state: PM transition of the system being carried out. | |
5af84b82 | 503 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 504 | */ |
97df8c12 | 505 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 RW |
506 | { |
507 | int error = 0; | |
508 | ||
509 | TRACE_DEVICE(dev); | |
510 | TRACE_RESUME(0); | |
cd59abfc | 511 | |
5af84b82 | 512 | dpm_wait(dev->parent, async); |
8e9394ce | 513 | device_lock(dev); |
7a8d37a3 | 514 | |
b8c76f6a | 515 | dev->power.in_suspend = false; |
97df8c12 | 516 | |
7538e3db RW |
517 | if (dev->pwr_domain) { |
518 | pm_dev_dbg(dev, state, "power domain "); | |
519 | pm_op(dev, &dev->pwr_domain->ops, state); | |
520 | } | |
521 | ||
9659cc06 RW |
522 | if (dev->type && dev->type->pm) { |
523 | pm_dev_dbg(dev, state, "type "); | |
524 | error = pm_op(dev, dev->type->pm, state); | |
525 | goto End; | |
cd59abfc AS |
526 | } |
527 | ||
1eede070 RW |
528 | if (dev->class) { |
529 | if (dev->class->pm) { | |
530 | pm_dev_dbg(dev, state, "class "); | |
531 | error = pm_op(dev, dev->class->pm, state); | |
9659cc06 | 532 | goto End; |
1eede070 RW |
533 | } else if (dev->class->resume) { |
534 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 535 | error = legacy_resume(dev, dev->class->resume); |
9659cc06 | 536 | goto End; |
1eede070 | 537 | } |
cd59abfc | 538 | } |
9659cc06 RW |
539 | |
540 | if (dev->bus) { | |
541 | if (dev->bus->pm) { | |
542 | pm_dev_dbg(dev, state, ""); | |
543 | error = pm_op(dev, dev->bus->pm, state); | |
544 | } else if (dev->bus->resume) { | |
545 | pm_dev_dbg(dev, state, "legacy "); | |
546 | error = legacy_resume(dev, dev->bus->resume); | |
547 | } | |
548 | } | |
549 | ||
1eede070 | 550 | End: |
8e9394ce | 551 | device_unlock(dev); |
5af84b82 | 552 | complete_all(&dev->power.completion); |
7a8d37a3 | 553 | |
cd59abfc AS |
554 | TRACE_RESUME(error); |
555 | return error; | |
556 | } | |
557 | ||
5af84b82 RW |
558 | static void async_resume(void *data, async_cookie_t cookie) |
559 | { | |
560 | struct device *dev = (struct device *)data; | |
561 | int error; | |
562 | ||
97df8c12 | 563 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
564 | if (error) |
565 | pm_dev_err(dev, pm_transition, " async", error); | |
566 | put_device(dev); | |
567 | } | |
568 | ||
97df8c12 | 569 | static bool is_async(struct device *dev) |
5af84b82 | 570 | { |
97df8c12 RW |
571 | return dev->power.async_suspend && pm_async_enabled |
572 | && !pm_trace_is_enabled(); | |
5af84b82 RW |
573 | } |
574 | ||
775b64d2 | 575 | /** |
20d652d7 RW |
576 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
577 | * @state: PM transition of the system being carried out. | |
775b64d2 | 578 | * |
20d652d7 RW |
579 | * Execute the appropriate "resume" callback for all devices whose status |
580 | * indicates that they are suspended. | |
1eede070 RW |
581 | */ |
582 | static void dpm_resume(pm_message_t state) | |
583 | { | |
97df8c12 | 584 | struct device *dev; |
ecf762b2 | 585 | ktime_t starttime = ktime_get(); |
1eede070 | 586 | |
1eede070 | 587 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 588 | pm_transition = state; |
098dff73 | 589 | async_error = 0; |
1eede070 | 590 | |
8a43a9ab | 591 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
97df8c12 RW |
592 | INIT_COMPLETION(dev->power.completion); |
593 | if (is_async(dev)) { | |
594 | get_device(dev); | |
595 | async_schedule(async_resume, dev); | |
596 | } | |
597 | } | |
598 | ||
8a43a9ab RW |
599 | while (!list_empty(&dpm_suspended_list)) { |
600 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 601 | get_device(dev); |
5b219a51 | 602 | if (!is_async(dev)) { |
1eede070 RW |
603 | int error; |
604 | ||
1eede070 RW |
605 | mutex_unlock(&dpm_list_mtx); |
606 | ||
97df8c12 | 607 | error = device_resume(dev, state, false); |
1eede070 RW |
608 | if (error) |
609 | pm_dev_err(dev, state, "", error); | |
5b219a51 RW |
610 | |
611 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
612 | } |
613 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 614 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
615 | put_device(dev); |
616 | } | |
1eede070 | 617 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 618 | async_synchronize_full(); |
ecf762b2 | 619 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
620 | } |
621 | ||
622 | /** | |
20d652d7 RW |
623 | * device_complete - Complete a PM transition for given device. |
624 | * @dev: Device to handle. | |
625 | * @state: PM transition of the system being carried out. | |
1eede070 | 626 | */ |
d1616302 | 627 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 628 | { |
8e9394ce | 629 | device_lock(dev); |
1eede070 | 630 | |
7538e3db RW |
631 | if (dev->pwr_domain && dev->pwr_domain->ops.complete) { |
632 | pm_dev_dbg(dev, state, "completing power domain "); | |
633 | dev->pwr_domain->ops.complete(dev); | |
634 | } | |
635 | ||
9659cc06 | 636 | if (dev->type && dev->type->pm) { |
1eede070 | 637 | pm_dev_dbg(dev, state, "completing type "); |
9659cc06 RW |
638 | if (dev->type->pm->complete) |
639 | dev->type->pm->complete(dev); | |
640 | } else if (dev->class && dev->class->pm) { | |
641 | pm_dev_dbg(dev, state, "completing class "); | |
642 | if (dev->class->pm->complete) | |
643 | dev->class->pm->complete(dev); | |
644 | } else if (dev->bus && dev->bus->pm) { | |
1eede070 | 645 | pm_dev_dbg(dev, state, "completing "); |
9659cc06 RW |
646 | if (dev->bus->pm->complete) |
647 | dev->bus->pm->complete(dev); | |
1eede070 RW |
648 | } |
649 | ||
8e9394ce | 650 | device_unlock(dev); |
1eede070 RW |
651 | } |
652 | ||
653 | /** | |
20d652d7 RW |
654 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
655 | * @state: PM transition of the system being carried out. | |
775b64d2 | 656 | * |
20d652d7 RW |
657 | * Execute the ->complete() callbacks for all devices whose PM status is not |
658 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 659 | */ |
1eede070 | 660 | static void dpm_complete(pm_message_t state) |
cd59abfc | 661 | { |
1eede070 RW |
662 | struct list_head list; |
663 | ||
664 | INIT_LIST_HEAD(&list); | |
cd59abfc | 665 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
666 | while (!list_empty(&dpm_prepared_list)) { |
667 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 668 | |
1eede070 | 669 | get_device(dev); |
b8c76f6a | 670 | dev->power.in_suspend = false; |
5b219a51 RW |
671 | list_move(&dev->power.entry, &list); |
672 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 673 | |
5b219a51 | 674 | device_complete(dev, state); |
1eede070 | 675 | |
5b219a51 | 676 | mutex_lock(&dpm_list_mtx); |
1eede070 | 677 | put_device(dev); |
cd59abfc | 678 | } |
1eede070 | 679 | list_splice(&list, &dpm_list); |
cd59abfc AS |
680 | mutex_unlock(&dpm_list_mtx); |
681 | } | |
682 | ||
cd59abfc | 683 | /** |
20d652d7 RW |
684 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
685 | * @state: PM transition of the system being carried out. | |
cd59abfc | 686 | * |
20d652d7 RW |
687 | * Execute "resume" callbacks for all devices and complete the PM transition of |
688 | * the system. | |
cd59abfc | 689 | */ |
d1616302 | 690 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 691 | { |
775b64d2 | 692 | might_sleep(); |
1eede070 RW |
693 | dpm_resume(state); |
694 | dpm_complete(state); | |
cd59abfc | 695 | } |
d1616302 | 696 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
697 | |
698 | ||
699 | /*------------------------- Suspend routines -------------------------*/ | |
700 | ||
1eede070 | 701 | /** |
20d652d7 RW |
702 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
703 | * @sleep_state: PM message representing a sleep state. | |
704 | * | |
705 | * Return a PM message representing the resume event corresponding to given | |
706 | * sleep state. | |
1eede070 RW |
707 | */ |
708 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 709 | { |
1eede070 RW |
710 | switch (sleep_state.event) { |
711 | case PM_EVENT_SUSPEND: | |
712 | return PMSG_RESUME; | |
713 | case PM_EVENT_FREEZE: | |
714 | case PM_EVENT_QUIESCE: | |
715 | return PMSG_RECOVER; | |
716 | case PM_EVENT_HIBERNATE: | |
717 | return PMSG_RESTORE; | |
cd59abfc | 718 | } |
1eede070 | 719 | return PMSG_ON; |
cd59abfc AS |
720 | } |
721 | ||
722 | /** | |
20d652d7 RW |
723 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
724 | * @dev: Device to handle. | |
725 | * @state: PM transition of the system being carried out. | |
775b64d2 | 726 | * |
20d652d7 RW |
727 | * The driver of @dev will not receive interrupts while this function is being |
728 | * executed. | |
cd59abfc | 729 | */ |
d1616302 | 730 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 | 731 | { |
9659cc06 | 732 | int error; |
e7176a37 DB |
733 | |
734 | if (dev->type && dev->type->pm) { | |
735 | pm_dev_dbg(dev, state, "LATE type "); | |
736 | error = pm_noirq_op(dev, dev->type->pm, state); | |
737 | if (error) | |
9659cc06 RW |
738 | return error; |
739 | } else if (dev->class && dev->class->pm) { | |
740 | pm_dev_dbg(dev, state, "LATE class "); | |
741 | error = pm_noirq_op(dev, dev->class->pm, state); | |
742 | if (error) | |
743 | return error; | |
744 | } else if (dev->bus && dev->bus->pm) { | |
1eede070 RW |
745 | pm_dev_dbg(dev, state, "LATE "); |
746 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
7538e3db | 747 | if (error) |
9659cc06 | 748 | return error; |
7538e3db RW |
749 | } |
750 | ||
751 | if (dev->pwr_domain) { | |
752 | pm_dev_dbg(dev, state, "LATE power domain "); | |
753 | pm_noirq_op(dev, &dev->pwr_domain->ops, state); | |
775b64d2 | 754 | } |
e7176a37 | 755 | |
9659cc06 | 756 | return 0; |
775b64d2 RW |
757 | } |
758 | ||
759 | /** | |
20d652d7 RW |
760 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
761 | * @state: PM transition of the system being carried out. | |
775b64d2 | 762 | * |
20d652d7 RW |
763 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
764 | * handlers for all non-sysdev devices. | |
775b64d2 | 765 | */ |
d1616302 | 766 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 767 | { |
ecf762b2 | 768 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
769 | int error = 0; |
770 | ||
2ed8d2b3 | 771 | suspend_device_irqs(); |
32bdfac5 | 772 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
773 | while (!list_empty(&dpm_suspended_list)) { |
774 | struct device *dev = to_device(dpm_suspended_list.prev); | |
d08a5ace RW |
775 | |
776 | get_device(dev); | |
777 | mutex_unlock(&dpm_list_mtx); | |
778 | ||
d1616302 | 779 | error = device_suspend_noirq(dev, state); |
d08a5ace RW |
780 | |
781 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 782 | if (error) { |
1eede070 | 783 | pm_dev_err(dev, state, " late", error); |
d08a5ace | 784 | put_device(dev); |
775b64d2 RW |
785 | break; |
786 | } | |
d08a5ace | 787 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 788 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 789 | put_device(dev); |
775b64d2 | 790 | } |
32bdfac5 | 791 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 792 | if (error) |
d1616302 | 793 | dpm_resume_noirq(resume_event(state)); |
ecf762b2 RW |
794 | else |
795 | dpm_show_time(starttime, state, "late"); | |
775b64d2 RW |
796 | return error; |
797 | } | |
d1616302 | 798 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
775b64d2 | 799 | |
875ab0b7 RW |
800 | /** |
801 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
802 | * @dev: Device to suspend. |
803 | * @state: PM transition of the system being carried out. | |
804 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
805 | */ |
806 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
807 | int (*cb)(struct device *dev, pm_message_t state)) | |
808 | { | |
809 | int error; | |
810 | ktime_t calltime; | |
811 | ||
812 | calltime = initcall_debug_start(dev); | |
813 | ||
814 | error = cb(dev, state); | |
815 | suspend_report_result(cb, error); | |
816 | ||
817 | initcall_debug_report(dev, calltime, error); | |
818 | ||
819 | return error; | |
820 | } | |
821 | ||
775b64d2 | 822 | /** |
20d652d7 RW |
823 | * device_suspend - Execute "suspend" callbacks for given device. |
824 | * @dev: Device to handle. | |
825 | * @state: PM transition of the system being carried out. | |
5af84b82 | 826 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 827 | */ |
5af84b82 | 828 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc AS |
829 | { |
830 | int error = 0; | |
831 | ||
5af84b82 | 832 | dpm_wait_for_children(dev, async); |
8e9394ce | 833 | device_lock(dev); |
7a8d37a3 | 834 | |
5af84b82 RW |
835 | if (async_error) |
836 | goto End; | |
837 | ||
d83f905e RW |
838 | if (pm_wakeup_pending()) { |
839 | async_error = -EBUSY; | |
840 | goto End; | |
841 | } | |
842 | ||
9659cc06 RW |
843 | if (dev->type && dev->type->pm) { |
844 | pm_dev_dbg(dev, state, "type "); | |
845 | error = pm_op(dev, dev->type->pm, state); | |
846 | goto Domain; | |
847 | } | |
848 | ||
1eede070 RW |
849 | if (dev->class) { |
850 | if (dev->class->pm) { | |
851 | pm_dev_dbg(dev, state, "class "); | |
852 | error = pm_op(dev, dev->class->pm, state); | |
9659cc06 | 853 | goto Domain; |
1eede070 RW |
854 | } else if (dev->class->suspend) { |
855 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 856 | error = legacy_suspend(dev, state, dev->class->suspend); |
9659cc06 | 857 | goto Domain; |
1eede070 | 858 | } |
cd59abfc AS |
859 | } |
860 | ||
1eede070 RW |
861 | if (dev->bus) { |
862 | if (dev->bus->pm) { | |
863 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 864 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
865 | } else if (dev->bus->suspend) { |
866 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 867 | error = legacy_suspend(dev, state, dev->bus->suspend); |
1eede070 | 868 | } |
7538e3db RW |
869 | } |
870 | ||
9659cc06 RW |
871 | Domain: |
872 | if (!error && dev->pwr_domain) { | |
7538e3db RW |
873 | pm_dev_dbg(dev, state, "power domain "); |
874 | pm_op(dev, &dev->pwr_domain->ops, state); | |
cd59abfc | 875 | } |
5af84b82 | 876 | |
1eede070 | 877 | End: |
8e9394ce | 878 | device_unlock(dev); |
5af84b82 | 879 | complete_all(&dev->power.completion); |
7a8d37a3 | 880 | |
098dff73 RW |
881 | if (error) |
882 | async_error = error; | |
883 | ||
cd59abfc AS |
884 | return error; |
885 | } | |
886 | ||
5af84b82 RW |
887 | static void async_suspend(void *data, async_cookie_t cookie) |
888 | { | |
889 | struct device *dev = (struct device *)data; | |
890 | int error; | |
891 | ||
892 | error = __device_suspend(dev, pm_transition, true); | |
098dff73 | 893 | if (error) |
5af84b82 | 894 | pm_dev_err(dev, pm_transition, " async", error); |
5af84b82 RW |
895 | |
896 | put_device(dev); | |
897 | } | |
898 | ||
899 | static int device_suspend(struct device *dev) | |
900 | { | |
901 | INIT_COMPLETION(dev->power.completion); | |
902 | ||
0e06b4a8 | 903 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
904 | get_device(dev); |
905 | async_schedule(async_suspend, dev); | |
906 | return 0; | |
907 | } | |
908 | ||
909 | return __device_suspend(dev, pm_transition, false); | |
910 | } | |
911 | ||
cd59abfc | 912 | /** |
20d652d7 RW |
913 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
914 | * @state: PM transition of the system being carried out. | |
cd59abfc | 915 | */ |
775b64d2 | 916 | static int dpm_suspend(pm_message_t state) |
cd59abfc | 917 | { |
ecf762b2 | 918 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
919 | int error = 0; |
920 | ||
cd59abfc | 921 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
922 | pm_transition = state; |
923 | async_error = 0; | |
8a43a9ab RW |
924 | while (!list_empty(&dpm_prepared_list)) { |
925 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 926 | |
1eede070 | 927 | get_device(dev); |
cd59abfc | 928 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 929 | |
5af84b82 | 930 | error = device_suspend(dev); |
1eede070 | 931 | |
1b3cbec1 | 932 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 933 | if (error) { |
1eede070 RW |
934 | pm_dev_err(dev, state, "", error); |
935 | put_device(dev); | |
775b64d2 RW |
936 | break; |
937 | } | |
7a8d37a3 | 938 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 939 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 940 | put_device(dev); |
5af84b82 RW |
941 | if (async_error) |
942 | break; | |
cd59abfc AS |
943 | } |
944 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
945 | async_synchronize_full(); |
946 | if (!error) | |
947 | error = async_error; | |
ecf762b2 RW |
948 | if (!error) |
949 | dpm_show_time(starttime, state, NULL); | |
1eede070 RW |
950 | return error; |
951 | } | |
952 | ||
953 | /** | |
20d652d7 RW |
954 | * device_prepare - Prepare a device for system power transition. |
955 | * @dev: Device to handle. | |
956 | * @state: PM transition of the system being carried out. | |
957 | * | |
958 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
959 | * device may be registered after this function has returned. | |
1eede070 | 960 | */ |
d1616302 | 961 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 RW |
962 | { |
963 | int error = 0; | |
964 | ||
8e9394ce | 965 | device_lock(dev); |
1eede070 | 966 | |
9659cc06 | 967 | if (dev->type && dev->type->pm) { |
1eede070 | 968 | pm_dev_dbg(dev, state, "preparing type "); |
9659cc06 RW |
969 | if (dev->type->pm->prepare) |
970 | error = dev->type->pm->prepare(dev); | |
1eede070 RW |
971 | suspend_report_result(dev->type->pm->prepare, error); |
972 | if (error) | |
973 | goto End; | |
9659cc06 | 974 | } else if (dev->class && dev->class->pm) { |
1eede070 | 975 | pm_dev_dbg(dev, state, "preparing class "); |
9659cc06 RW |
976 | if (dev->class->pm->prepare) |
977 | error = dev->class->pm->prepare(dev); | |
1eede070 | 978 | suspend_report_result(dev->class->pm->prepare, error); |
7538e3db RW |
979 | if (error) |
980 | goto End; | |
9659cc06 RW |
981 | } else if (dev->bus && dev->bus->pm) { |
982 | pm_dev_dbg(dev, state, "preparing "); | |
983 | if (dev->bus->pm->prepare) | |
984 | error = dev->bus->pm->prepare(dev); | |
985 | suspend_report_result(dev->bus->pm->prepare, error); | |
986 | if (error) | |
987 | goto End; | |
7538e3db RW |
988 | } |
989 | ||
990 | if (dev->pwr_domain && dev->pwr_domain->ops.prepare) { | |
991 | pm_dev_dbg(dev, state, "preparing power domain "); | |
992 | dev->pwr_domain->ops.prepare(dev); | |
1eede070 | 993 | } |
7538e3db | 994 | |
1eede070 | 995 | End: |
8e9394ce | 996 | device_unlock(dev); |
1eede070 RW |
997 | |
998 | return error; | |
999 | } | |
cd59abfc | 1000 | |
1eede070 | 1001 | /** |
20d652d7 RW |
1002 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1003 | * @state: PM transition of the system being carried out. | |
1eede070 | 1004 | * |
20d652d7 | 1005 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 RW |
1006 | */ |
1007 | static int dpm_prepare(pm_message_t state) | |
1008 | { | |
1eede070 RW |
1009 | int error = 0; |
1010 | ||
1eede070 | 1011 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
1012 | while (!list_empty(&dpm_list)) { |
1013 | struct device *dev = to_device(dpm_list.next); | |
1014 | ||
1015 | get_device(dev); | |
1eede070 RW |
1016 | mutex_unlock(&dpm_list_mtx); |
1017 | ||
5e928f77 | 1018 | pm_runtime_get_noresume(dev); |
1e75227e RW |
1019 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1020 | pm_wakeup_event(dev, 0); | |
1021 | ||
e8665002 RW |
1022 | pm_runtime_put_sync(dev); |
1023 | error = pm_wakeup_pending() ? | |
1024 | -EBUSY : device_prepare(dev, state); | |
1eede070 RW |
1025 | |
1026 | mutex_lock(&dpm_list_mtx); | |
1027 | if (error) { | |
1eede070 RW |
1028 | if (error == -EAGAIN) { |
1029 | put_device(dev); | |
886a7a33 | 1030 | error = 0; |
1eede070 RW |
1031 | continue; |
1032 | } | |
1e75227e RW |
1033 | printk(KERN_INFO "PM: Device %s not prepared " |
1034 | "for power transition: code %d\n", | |
5c1a07ab | 1035 | dev_name(dev), error); |
1eede070 RW |
1036 | put_device(dev); |
1037 | break; | |
1038 | } | |
b8c76f6a | 1039 | dev->power.in_suspend = true; |
1eede070 | 1040 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1041 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1042 | put_device(dev); |
1043 | } | |
1eede070 | 1044 | mutex_unlock(&dpm_list_mtx); |
cd59abfc AS |
1045 | return error; |
1046 | } | |
1047 | ||
775b64d2 | 1048 | /** |
20d652d7 RW |
1049 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1050 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1051 | * |
20d652d7 RW |
1052 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1053 | * callbacks for them. | |
775b64d2 | 1054 | */ |
d1616302 | 1055 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1056 | { |
1057 | int error; | |
cd59abfc | 1058 | |
775b64d2 | 1059 | might_sleep(); |
1eede070 RW |
1060 | error = dpm_prepare(state); |
1061 | if (!error) | |
1062 | error = dpm_suspend(state); | |
cd59abfc | 1063 | return error; |
cd59abfc | 1064 | } |
d1616302 | 1065 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1066 | |
1067 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1068 | { | |
c80cfb04 BH |
1069 | if (ret) |
1070 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1071 | } |
1072 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1073 | |
1074 | /** | |
1075 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1076 | * @dev: Device to wait for. | |
1077 | * @subordinate: Device that needs to wait for @dev. | |
1078 | */ | |
098dff73 | 1079 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1080 | { |
1081 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1082 | return async_error; |
f8824cee RW |
1083 | } |
1084 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |