]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/base/power/main.c - Where the driver meets power management. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * | |
10 | * The driver model core calls device_pm_add() when a device is registered. | |
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 | 65 | pm_runtime_init(dev); |
22110faf | 66 | INIT_LIST_HEAD(&dev->power.entry); |
5e928f77 RW |
67 | } |
68 | ||
1eede070 | 69 | /** |
20d652d7 | 70 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
71 | */ |
72 | void device_pm_lock(void) | |
73 | { | |
74 | mutex_lock(&dpm_list_mtx); | |
75 | } | |
76 | ||
77 | /** | |
20d652d7 | 78 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
79 | */ |
80 | void device_pm_unlock(void) | |
81 | { | |
82 | mutex_unlock(&dpm_list_mtx); | |
83 | } | |
075c1771 | 84 | |
775b64d2 | 85 | /** |
20d652d7 RW |
86 | * device_pm_add - Add a device to the PM core's list of active devices. |
87 | * @dev: Device to add to the list. | |
775b64d2 | 88 | */ |
3b98aeaf | 89 | void device_pm_add(struct device *dev) |
1da177e4 | 90 | { |
1da177e4 | 91 | pr_debug("PM: Adding info for %s:%s\n", |
5c1a07ab | 92 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
11048dcf | 93 | mutex_lock(&dpm_list_mtx); |
b64959e6 RW |
94 | if (dev->parent && dev->parent->power.in_suspend) |
95 | dev_warn(dev, "parent %s should not be sleeping\n", | |
96 | dev_name(dev->parent)); | |
3b98aeaf | 97 | list_add_tail(&dev->power.entry, &dpm_list); |
11048dcf | 98 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
99 | } |
100 | ||
775b64d2 | 101 | /** |
20d652d7 RW |
102 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
103 | * @dev: Device to be removed from the list. | |
775b64d2 | 104 | */ |
9cddad77 | 105 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
106 | { |
107 | pr_debug("PM: Removing info for %s:%s\n", | |
5c1a07ab | 108 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
5af84b82 | 109 | complete_all(&dev->power.completion); |
11048dcf | 110 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 111 | list_del_init(&dev->power.entry); |
11048dcf | 112 | mutex_unlock(&dpm_list_mtx); |
074037ec | 113 | device_wakeup_disable(dev); |
5e928f77 | 114 | pm_runtime_remove(dev); |
775b64d2 RW |
115 | } |
116 | ||
ffa6a705 | 117 | /** |
20d652d7 RW |
118 | * device_pm_move_before - Move device in the PM core's list of active devices. |
119 | * @deva: Device to move in dpm_list. | |
120 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
121 | */ |
122 | void device_pm_move_before(struct device *deva, struct device *devb) | |
123 | { | |
124 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
5c1a07ab RW |
125 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
126 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
127 | /* Delete deva from dpm_list and reinsert before devb. */ |
128 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
129 | } | |
130 | ||
131 | /** | |
20d652d7 RW |
132 | * device_pm_move_after - Move device in the PM core's list of active devices. |
133 | * @deva: Device to move in dpm_list. | |
134 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
135 | */ |
136 | void device_pm_move_after(struct device *deva, struct device *devb) | |
137 | { | |
138 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
5c1a07ab RW |
139 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
140 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
141 | /* Delete deva from dpm_list and reinsert after devb. */ |
142 | list_move(&deva->power.entry, &devb->power.entry); | |
143 | } | |
144 | ||
145 | /** | |
20d652d7 RW |
146 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
147 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
148 | */ |
149 | void device_pm_move_last(struct device *dev) | |
150 | { | |
151 | pr_debug("PM: Moving %s:%s to end of list\n", | |
5c1a07ab | 152 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
ffa6a705 CH |
153 | list_move_tail(&dev->power.entry, &dpm_list); |
154 | } | |
155 | ||
875ab0b7 RW |
156 | static ktime_t initcall_debug_start(struct device *dev) |
157 | { | |
158 | ktime_t calltime = ktime_set(0, 0); | |
159 | ||
160 | if (initcall_debug) { | |
161 | pr_info("calling %s+ @ %i\n", | |
162 | dev_name(dev), task_pid_nr(current)); | |
163 | calltime = ktime_get(); | |
164 | } | |
165 | ||
166 | return calltime; | |
167 | } | |
168 | ||
169 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
170 | int error) | |
171 | { | |
172 | ktime_t delta, rettime; | |
173 | ||
174 | if (initcall_debug) { | |
175 | rettime = ktime_get(); | |
176 | delta = ktime_sub(rettime, calltime); | |
177 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), | |
178 | error, (unsigned long long)ktime_to_ns(delta) >> 10); | |
179 | } | |
180 | } | |
181 | ||
5af84b82 RW |
182 | /** |
183 | * dpm_wait - Wait for a PM operation to complete. | |
184 | * @dev: Device to wait for. | |
185 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
186 | */ | |
187 | static void dpm_wait(struct device *dev, bool async) | |
188 | { | |
189 | if (!dev) | |
190 | return; | |
191 | ||
0e06b4a8 | 192 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
193 | wait_for_completion(&dev->power.completion); |
194 | } | |
195 | ||
196 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
197 | { | |
198 | dpm_wait(dev, *((bool *)async_ptr)); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static void dpm_wait_for_children(struct device *dev, bool async) | |
203 | { | |
204 | device_for_each_child(dev, &async, dpm_wait_fn); | |
205 | } | |
206 | ||
1eede070 | 207 | /** |
20d652d7 RW |
208 | * pm_op - Execute the PM operation appropriate for given PM event. |
209 | * @dev: Device to handle. | |
210 | * @ops: PM operations to choose from. | |
211 | * @state: PM transition of the system being carried out. | |
1eede070 | 212 | */ |
d9ab7716 DT |
213 | static int pm_op(struct device *dev, |
214 | const struct dev_pm_ops *ops, | |
215 | pm_message_t state) | |
1eede070 RW |
216 | { |
217 | int error = 0; | |
875ab0b7 | 218 | ktime_t calltime; |
f2511774 | 219 | |
875ab0b7 | 220 | calltime = initcall_debug_start(dev); |
1eede070 RW |
221 | |
222 | switch (state.event) { | |
223 | #ifdef CONFIG_SUSPEND | |
224 | case PM_EVENT_SUSPEND: | |
225 | if (ops->suspend) { | |
226 | error = ops->suspend(dev); | |
227 | suspend_report_result(ops->suspend, error); | |
228 | } | |
229 | break; | |
230 | case PM_EVENT_RESUME: | |
231 | if (ops->resume) { | |
232 | error = ops->resume(dev); | |
233 | suspend_report_result(ops->resume, error); | |
234 | } | |
235 | break; | |
236 | #endif /* CONFIG_SUSPEND */ | |
1f112cee | 237 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
238 | case PM_EVENT_FREEZE: |
239 | case PM_EVENT_QUIESCE: | |
240 | if (ops->freeze) { | |
241 | error = ops->freeze(dev); | |
242 | suspend_report_result(ops->freeze, error); | |
243 | } | |
244 | break; | |
245 | case PM_EVENT_HIBERNATE: | |
246 | if (ops->poweroff) { | |
247 | error = ops->poweroff(dev); | |
248 | suspend_report_result(ops->poweroff, error); | |
249 | } | |
250 | break; | |
251 | case PM_EVENT_THAW: | |
252 | case PM_EVENT_RECOVER: | |
253 | if (ops->thaw) { | |
254 | error = ops->thaw(dev); | |
255 | suspend_report_result(ops->thaw, error); | |
256 | } | |
257 | break; | |
258 | case PM_EVENT_RESTORE: | |
259 | if (ops->restore) { | |
260 | error = ops->restore(dev); | |
261 | suspend_report_result(ops->restore, error); | |
262 | } | |
263 | break; | |
1f112cee | 264 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 RW |
265 | default: |
266 | error = -EINVAL; | |
267 | } | |
f2511774 | 268 | |
875ab0b7 | 269 | initcall_debug_report(dev, calltime, error); |
f2511774 | 270 | |
1eede070 RW |
271 | return error; |
272 | } | |
273 | ||
274 | /** | |
20d652d7 RW |
275 | * pm_noirq_op - Execute the PM operation appropriate for given PM event. |
276 | * @dev: Device to handle. | |
277 | * @ops: PM operations to choose from. | |
278 | * @state: PM transition of the system being carried out. | |
1eede070 | 279 | * |
20d652d7 RW |
280 | * The driver of @dev will not receive interrupts while this function is being |
281 | * executed. | |
1eede070 | 282 | */ |
d9ab7716 DT |
283 | static int pm_noirq_op(struct device *dev, |
284 | const struct dev_pm_ops *ops, | |
1eede070 RW |
285 | pm_message_t state) |
286 | { | |
287 | int error = 0; | |
2cbb3ce1 | 288 | ktime_t calltime = ktime_set(0, 0), delta, rettime; |
f2511774 AV |
289 | |
290 | if (initcall_debug) { | |
8cc6b39f RW |
291 | pr_info("calling %s+ @ %i, parent: %s\n", |
292 | dev_name(dev), task_pid_nr(current), | |
293 | dev->parent ? dev_name(dev->parent) : "none"); | |
f2511774 AV |
294 | calltime = ktime_get(); |
295 | } | |
1eede070 RW |
296 | |
297 | switch (state.event) { | |
298 | #ifdef CONFIG_SUSPEND | |
299 | case PM_EVENT_SUSPEND: | |
300 | if (ops->suspend_noirq) { | |
301 | error = ops->suspend_noirq(dev); | |
302 | suspend_report_result(ops->suspend_noirq, error); | |
303 | } | |
304 | break; | |
305 | case PM_EVENT_RESUME: | |
306 | if (ops->resume_noirq) { | |
307 | error = ops->resume_noirq(dev); | |
308 | suspend_report_result(ops->resume_noirq, error); | |
309 | } | |
310 | break; | |
311 | #endif /* CONFIG_SUSPEND */ | |
1f112cee | 312 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
313 | case PM_EVENT_FREEZE: |
314 | case PM_EVENT_QUIESCE: | |
315 | if (ops->freeze_noirq) { | |
316 | error = ops->freeze_noirq(dev); | |
317 | suspend_report_result(ops->freeze_noirq, error); | |
318 | } | |
319 | break; | |
320 | case PM_EVENT_HIBERNATE: | |
321 | if (ops->poweroff_noirq) { | |
322 | error = ops->poweroff_noirq(dev); | |
323 | suspend_report_result(ops->poweroff_noirq, error); | |
324 | } | |
325 | break; | |
326 | case PM_EVENT_THAW: | |
327 | case PM_EVENT_RECOVER: | |
328 | if (ops->thaw_noirq) { | |
329 | error = ops->thaw_noirq(dev); | |
330 | suspend_report_result(ops->thaw_noirq, error); | |
331 | } | |
332 | break; | |
333 | case PM_EVENT_RESTORE: | |
334 | if (ops->restore_noirq) { | |
335 | error = ops->restore_noirq(dev); | |
336 | suspend_report_result(ops->restore_noirq, error); | |
337 | } | |
338 | break; | |
1f112cee | 339 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 RW |
340 | default: |
341 | error = -EINVAL; | |
342 | } | |
f2511774 AV |
343 | |
344 | if (initcall_debug) { | |
345 | rettime = ktime_get(); | |
346 | delta = ktime_sub(rettime, calltime); | |
875ab0b7 RW |
347 | printk("initcall %s_i+ returned %d after %Ld usecs\n", |
348 | dev_name(dev), error, | |
349 | (unsigned long long)ktime_to_ns(delta) >> 10); | |
f2511774 AV |
350 | } |
351 | ||
1eede070 RW |
352 | return error; |
353 | } | |
354 | ||
355 | static char *pm_verb(int event) | |
356 | { | |
357 | switch (event) { | |
358 | case PM_EVENT_SUSPEND: | |
359 | return "suspend"; | |
360 | case PM_EVENT_RESUME: | |
361 | return "resume"; | |
362 | case PM_EVENT_FREEZE: | |
363 | return "freeze"; | |
364 | case PM_EVENT_QUIESCE: | |
365 | return "quiesce"; | |
366 | case PM_EVENT_HIBERNATE: | |
367 | return "hibernate"; | |
368 | case PM_EVENT_THAW: | |
369 | return "thaw"; | |
370 | case PM_EVENT_RESTORE: | |
371 | return "restore"; | |
372 | case PM_EVENT_RECOVER: | |
373 | return "recover"; | |
374 | default: | |
375 | return "(unknown PM event)"; | |
376 | } | |
377 | } | |
378 | ||
379 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) | |
380 | { | |
381 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
382 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
383 | ", may wakeup" : ""); | |
384 | } | |
385 | ||
386 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
387 | int error) | |
388 | { | |
389 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
5c1a07ab | 390 | dev_name(dev), pm_verb(state.event), info, error); |
1eede070 RW |
391 | } |
392 | ||
ecf762b2 RW |
393 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
394 | { | |
395 | ktime_t calltime; | |
0702d9ee | 396 | u64 usecs64; |
ecf762b2 RW |
397 | int usecs; |
398 | ||
399 | calltime = ktime_get(); | |
400 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
401 | do_div(usecs64, NSEC_PER_USEC); | |
402 | usecs = usecs64; | |
403 | if (usecs == 0) | |
404 | usecs = 1; | |
405 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
406 | info ?: "", info ? " " : "", pm_verb(state.event), | |
407 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
408 | } | |
409 | ||
cd59abfc AS |
410 | /*------------------------- Resume routines -------------------------*/ |
411 | ||
412 | /** | |
20d652d7 RW |
413 | * device_resume_noirq - Execute an "early resume" callback for given device. |
414 | * @dev: Device to handle. | |
415 | * @state: PM transition of the system being carried out. | |
cd59abfc | 416 | * |
20d652d7 RW |
417 | * The driver of @dev will not receive interrupts while this function is being |
418 | * executed. | |
cd59abfc | 419 | */ |
d1616302 | 420 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
cd59abfc AS |
421 | { |
422 | int error = 0; | |
423 | ||
424 | TRACE_DEVICE(dev); | |
425 | TRACE_RESUME(0); | |
426 | ||
7538e3db RW |
427 | if (dev->pwr_domain) { |
428 | pm_dev_dbg(dev, state, "EARLY power domain "); | |
4d27e9dc RW |
429 | error = pm_noirq_op(dev, &dev->pwr_domain->ops, state); |
430 | } else if (dev->type && dev->type->pm) { | |
e7176a37 DB |
431 | pm_dev_dbg(dev, state, "EARLY type "); |
432 | error = pm_noirq_op(dev, dev->type->pm, state); | |
9659cc06 | 433 | } else if (dev->class && dev->class->pm) { |
e7176a37 DB |
434 | pm_dev_dbg(dev, state, "EARLY class "); |
435 | error = pm_noirq_op(dev, dev->class->pm, state); | |
9659cc06 RW |
436 | } else if (dev->bus && dev->bus->pm) { |
437 | pm_dev_dbg(dev, state, "EARLY "); | |
438 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
e7176a37 DB |
439 | } |
440 | ||
775b64d2 RW |
441 | TRACE_RESUME(error); |
442 | return error; | |
443 | } | |
444 | ||
445 | /** | |
20d652d7 RW |
446 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
447 | * @state: PM transition of the system being carried out. | |
775b64d2 | 448 | * |
20d652d7 RW |
449 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
450 | * enable device drivers to receive interrupts. | |
775b64d2 | 451 | */ |
d1616302 | 452 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 453 | { |
ecf762b2 | 454 | ktime_t starttime = ktime_get(); |
775b64d2 | 455 | |
32bdfac5 | 456 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
457 | while (!list_empty(&dpm_noirq_list)) { |
458 | struct device *dev = to_device(dpm_noirq_list.next); | |
5b219a51 | 459 | int error; |
d08a5ace RW |
460 | |
461 | get_device(dev); | |
5b219a51 RW |
462 | list_move_tail(&dev->power.entry, &dpm_suspended_list); |
463 | mutex_unlock(&dpm_list_mtx); | |
d08a5ace | 464 | |
5b219a51 RW |
465 | error = device_resume_noirq(dev, state); |
466 | if (error) | |
467 | pm_dev_err(dev, state, " early", error); | |
d08a5ace | 468 | |
5b219a51 | 469 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
470 | put_device(dev); |
471 | } | |
32bdfac5 | 472 | mutex_unlock(&dpm_list_mtx); |
ecf762b2 | 473 | dpm_show_time(starttime, state, "early"); |
2ed8d2b3 | 474 | resume_device_irqs(); |
775b64d2 | 475 | } |
d1616302 | 476 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
775b64d2 | 477 | |
875ab0b7 RW |
478 | /** |
479 | * legacy_resume - Execute a legacy (bus or class) resume callback for device. | |
0a884223 RD |
480 | * @dev: Device to resume. |
481 | * @cb: Resume callback to execute. | |
875ab0b7 RW |
482 | */ |
483 | static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) | |
484 | { | |
485 | int error; | |
486 | ktime_t calltime; | |
487 | ||
488 | calltime = initcall_debug_start(dev); | |
489 | ||
490 | error = cb(dev); | |
491 | suspend_report_result(cb, error); | |
492 | ||
493 | initcall_debug_report(dev, calltime, error); | |
494 | ||
495 | return error; | |
496 | } | |
497 | ||
775b64d2 | 498 | /** |
97df8c12 | 499 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
500 | * @dev: Device to handle. |
501 | * @state: PM transition of the system being carried out. | |
5af84b82 | 502 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 503 | */ |
97df8c12 | 504 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 RW |
505 | { |
506 | int error = 0; | |
507 | ||
508 | TRACE_DEVICE(dev); | |
509 | TRACE_RESUME(0); | |
cd59abfc | 510 | |
5af84b82 | 511 | dpm_wait(dev->parent, async); |
8e9394ce | 512 | device_lock(dev); |
7a8d37a3 | 513 | |
b8c76f6a | 514 | dev->power.in_suspend = false; |
97df8c12 | 515 | |
7538e3db RW |
516 | if (dev->pwr_domain) { |
517 | pm_dev_dbg(dev, state, "power domain "); | |
4d27e9dc RW |
518 | error = pm_op(dev, &dev->pwr_domain->ops, state); |
519 | goto End; | |
7538e3db RW |
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 | |
4d27e9dc | 631 | if (dev->pwr_domain) { |
7538e3db | 632 | pm_dev_dbg(dev, state, "completing power domain "); |
4d27e9dc RW |
633 | if (dev->pwr_domain->ops.complete) |
634 | dev->pwr_domain->ops.complete(dev); | |
635 | } else if (dev->type && dev->type->pm) { | |
1eede070 | 636 | pm_dev_dbg(dev, state, "completing type "); |
9659cc06 RW |
637 | if (dev->type->pm->complete) |
638 | dev->type->pm->complete(dev); | |
639 | } else if (dev->class && dev->class->pm) { | |
640 | pm_dev_dbg(dev, state, "completing class "); | |
641 | if (dev->class->pm->complete) | |
642 | dev->class->pm->complete(dev); | |
643 | } else if (dev->bus && dev->bus->pm) { | |
1eede070 | 644 | pm_dev_dbg(dev, state, "completing "); |
9659cc06 RW |
645 | if (dev->bus->pm->complete) |
646 | dev->bus->pm->complete(dev); | |
1eede070 RW |
647 | } |
648 | ||
8e9394ce | 649 | device_unlock(dev); |
1eede070 RW |
650 | } |
651 | ||
652 | /** | |
20d652d7 RW |
653 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
654 | * @state: PM transition of the system being carried out. | |
775b64d2 | 655 | * |
20d652d7 RW |
656 | * Execute the ->complete() callbacks for all devices whose PM status is not |
657 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 658 | */ |
1eede070 | 659 | static void dpm_complete(pm_message_t state) |
cd59abfc | 660 | { |
1eede070 RW |
661 | struct list_head list; |
662 | ||
663 | INIT_LIST_HEAD(&list); | |
cd59abfc | 664 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
665 | while (!list_empty(&dpm_prepared_list)) { |
666 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 667 | |
1eede070 | 668 | get_device(dev); |
b8c76f6a | 669 | dev->power.in_suspend = false; |
5b219a51 RW |
670 | list_move(&dev->power.entry, &list); |
671 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 672 | |
5b219a51 | 673 | device_complete(dev, state); |
1eede070 | 674 | |
5b219a51 | 675 | mutex_lock(&dpm_list_mtx); |
1eede070 | 676 | put_device(dev); |
cd59abfc | 677 | } |
1eede070 | 678 | list_splice(&list, &dpm_list); |
cd59abfc AS |
679 | mutex_unlock(&dpm_list_mtx); |
680 | } | |
681 | ||
cd59abfc | 682 | /** |
20d652d7 RW |
683 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
684 | * @state: PM transition of the system being carried out. | |
cd59abfc | 685 | * |
20d652d7 RW |
686 | * Execute "resume" callbacks for all devices and complete the PM transition of |
687 | * the system. | |
cd59abfc | 688 | */ |
d1616302 | 689 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 690 | { |
775b64d2 | 691 | might_sleep(); |
1eede070 RW |
692 | dpm_resume(state); |
693 | dpm_complete(state); | |
cd59abfc | 694 | } |
d1616302 | 695 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
696 | |
697 | ||
698 | /*------------------------- Suspend routines -------------------------*/ | |
699 | ||
1eede070 | 700 | /** |
20d652d7 RW |
701 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
702 | * @sleep_state: PM message representing a sleep state. | |
703 | * | |
704 | * Return a PM message representing the resume event corresponding to given | |
705 | * sleep state. | |
1eede070 RW |
706 | */ |
707 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 708 | { |
1eede070 RW |
709 | switch (sleep_state.event) { |
710 | case PM_EVENT_SUSPEND: | |
711 | return PMSG_RESUME; | |
712 | case PM_EVENT_FREEZE: | |
713 | case PM_EVENT_QUIESCE: | |
714 | return PMSG_RECOVER; | |
715 | case PM_EVENT_HIBERNATE: | |
716 | return PMSG_RESTORE; | |
cd59abfc | 717 | } |
1eede070 | 718 | return PMSG_ON; |
cd59abfc AS |
719 | } |
720 | ||
721 | /** | |
20d652d7 RW |
722 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
723 | * @dev: Device to handle. | |
724 | * @state: PM transition of the system being carried out. | |
775b64d2 | 725 | * |
20d652d7 RW |
726 | * The driver of @dev will not receive interrupts while this function is being |
727 | * executed. | |
cd59abfc | 728 | */ |
d1616302 | 729 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 | 730 | { |
9659cc06 | 731 | int error; |
e7176a37 | 732 | |
4d27e9dc RW |
733 | if (dev->pwr_domain) { |
734 | pm_dev_dbg(dev, state, "LATE power domain "); | |
735 | error = pm_noirq_op(dev, &dev->pwr_domain->ops, state); | |
736 | if (error) | |
737 | return error; | |
738 | } else if (dev->type && dev->type->pm) { | |
e7176a37 DB |
739 | pm_dev_dbg(dev, state, "LATE type "); |
740 | error = pm_noirq_op(dev, dev->type->pm, state); | |
741 | if (error) | |
9659cc06 RW |
742 | return error; |
743 | } else if (dev->class && dev->class->pm) { | |
744 | pm_dev_dbg(dev, state, "LATE class "); | |
745 | error = pm_noirq_op(dev, dev->class->pm, state); | |
746 | if (error) | |
747 | return error; | |
748 | } else if (dev->bus && dev->bus->pm) { | |
1eede070 RW |
749 | pm_dev_dbg(dev, state, "LATE "); |
750 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
7538e3db | 751 | if (error) |
9659cc06 | 752 | return error; |
7538e3db RW |
753 | } |
754 | ||
9659cc06 | 755 | return 0; |
775b64d2 RW |
756 | } |
757 | ||
758 | /** | |
20d652d7 RW |
759 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
760 | * @state: PM transition of the system being carried out. | |
775b64d2 | 761 | * |
20d652d7 RW |
762 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
763 | * handlers for all non-sysdev devices. | |
775b64d2 | 764 | */ |
d1616302 | 765 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 766 | { |
ecf762b2 | 767 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
768 | int error = 0; |
769 | ||
2ed8d2b3 | 770 | suspend_device_irqs(); |
32bdfac5 | 771 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
772 | while (!list_empty(&dpm_suspended_list)) { |
773 | struct device *dev = to_device(dpm_suspended_list.prev); | |
d08a5ace RW |
774 | |
775 | get_device(dev); | |
776 | mutex_unlock(&dpm_list_mtx); | |
777 | ||
d1616302 | 778 | error = device_suspend_noirq(dev, state); |
d08a5ace RW |
779 | |
780 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 781 | if (error) { |
1eede070 | 782 | pm_dev_err(dev, state, " late", error); |
d08a5ace | 783 | put_device(dev); |
775b64d2 RW |
784 | break; |
785 | } | |
d08a5ace | 786 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 787 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 788 | put_device(dev); |
775b64d2 | 789 | } |
32bdfac5 | 790 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 791 | if (error) |
d1616302 | 792 | dpm_resume_noirq(resume_event(state)); |
ecf762b2 RW |
793 | else |
794 | dpm_show_time(starttime, state, "late"); | |
775b64d2 RW |
795 | return error; |
796 | } | |
d1616302 | 797 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
775b64d2 | 798 | |
875ab0b7 RW |
799 | /** |
800 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
801 | * @dev: Device to suspend. |
802 | * @state: PM transition of the system being carried out. | |
803 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
804 | */ |
805 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
806 | int (*cb)(struct device *dev, pm_message_t state)) | |
807 | { | |
808 | int error; | |
809 | ktime_t calltime; | |
810 | ||
811 | calltime = initcall_debug_start(dev); | |
812 | ||
813 | error = cb(dev, state); | |
814 | suspend_report_result(cb, error); | |
815 | ||
816 | initcall_debug_report(dev, calltime, error); | |
817 | ||
818 | return error; | |
819 | } | |
820 | ||
775b64d2 | 821 | /** |
20d652d7 RW |
822 | * device_suspend - Execute "suspend" callbacks for given device. |
823 | * @dev: Device to handle. | |
824 | * @state: PM transition of the system being carried out. | |
5af84b82 | 825 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 826 | */ |
5af84b82 | 827 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc AS |
828 | { |
829 | int error = 0; | |
830 | ||
5af84b82 | 831 | dpm_wait_for_children(dev, async); |
8e9394ce | 832 | device_lock(dev); |
7a8d37a3 | 833 | |
5af84b82 RW |
834 | if (async_error) |
835 | goto End; | |
836 | ||
d83f905e RW |
837 | if (pm_wakeup_pending()) { |
838 | async_error = -EBUSY; | |
839 | goto End; | |
840 | } | |
841 | ||
4d27e9dc RW |
842 | if (dev->pwr_domain) { |
843 | pm_dev_dbg(dev, state, "power domain "); | |
844 | error = pm_op(dev, &dev->pwr_domain->ops, state); | |
845 | goto End; | |
846 | } | |
847 | ||
9659cc06 RW |
848 | if (dev->type && dev->type->pm) { |
849 | pm_dev_dbg(dev, state, "type "); | |
850 | error = pm_op(dev, dev->type->pm, state); | |
4d27e9dc | 851 | goto End; |
9659cc06 RW |
852 | } |
853 | ||
1eede070 RW |
854 | if (dev->class) { |
855 | if (dev->class->pm) { | |
856 | pm_dev_dbg(dev, state, "class "); | |
857 | error = pm_op(dev, dev->class->pm, state); | |
4d27e9dc | 858 | goto End; |
1eede070 RW |
859 | } else if (dev->class->suspend) { |
860 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 861 | error = legacy_suspend(dev, state, dev->class->suspend); |
4d27e9dc | 862 | goto End; |
1eede070 | 863 | } |
cd59abfc AS |
864 | } |
865 | ||
1eede070 RW |
866 | if (dev->bus) { |
867 | if (dev->bus->pm) { | |
868 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 869 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
870 | } else if (dev->bus->suspend) { |
871 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 872 | error = legacy_suspend(dev, state, dev->bus->suspend); |
1eede070 | 873 | } |
7538e3db RW |
874 | } |
875 | ||
1eede070 | 876 | End: |
8e9394ce | 877 | device_unlock(dev); |
5af84b82 | 878 | complete_all(&dev->power.completion); |
7a8d37a3 | 879 | |
098dff73 RW |
880 | if (error) |
881 | async_error = error; | |
882 | ||
cd59abfc AS |
883 | return error; |
884 | } | |
885 | ||
5af84b82 RW |
886 | static void async_suspend(void *data, async_cookie_t cookie) |
887 | { | |
888 | struct device *dev = (struct device *)data; | |
889 | int error; | |
890 | ||
891 | error = __device_suspend(dev, pm_transition, true); | |
098dff73 | 892 | if (error) |
5af84b82 | 893 | pm_dev_err(dev, pm_transition, " async", error); |
5af84b82 RW |
894 | |
895 | put_device(dev); | |
896 | } | |
897 | ||
898 | static int device_suspend(struct device *dev) | |
899 | { | |
900 | INIT_COMPLETION(dev->power.completion); | |
901 | ||
0e06b4a8 | 902 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
903 | get_device(dev); |
904 | async_schedule(async_suspend, dev); | |
905 | return 0; | |
906 | } | |
907 | ||
908 | return __device_suspend(dev, pm_transition, false); | |
909 | } | |
910 | ||
cd59abfc | 911 | /** |
20d652d7 RW |
912 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
913 | * @state: PM transition of the system being carried out. | |
cd59abfc | 914 | */ |
775b64d2 | 915 | static int dpm_suspend(pm_message_t state) |
cd59abfc | 916 | { |
ecf762b2 | 917 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
918 | int error = 0; |
919 | ||
cd59abfc | 920 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
921 | pm_transition = state; |
922 | async_error = 0; | |
8a43a9ab RW |
923 | while (!list_empty(&dpm_prepared_list)) { |
924 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 925 | |
1eede070 | 926 | get_device(dev); |
cd59abfc | 927 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 928 | |
5af84b82 | 929 | error = device_suspend(dev); |
1eede070 | 930 | |
1b3cbec1 | 931 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 932 | if (error) { |
1eede070 RW |
933 | pm_dev_err(dev, state, "", error); |
934 | put_device(dev); | |
775b64d2 RW |
935 | break; |
936 | } | |
7a8d37a3 | 937 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 938 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 939 | put_device(dev); |
5af84b82 RW |
940 | if (async_error) |
941 | break; | |
cd59abfc AS |
942 | } |
943 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
944 | async_synchronize_full(); |
945 | if (!error) | |
946 | error = async_error; | |
ecf762b2 RW |
947 | if (!error) |
948 | dpm_show_time(starttime, state, NULL); | |
1eede070 RW |
949 | return error; |
950 | } | |
951 | ||
952 | /** | |
20d652d7 RW |
953 | * device_prepare - Prepare a device for system power transition. |
954 | * @dev: Device to handle. | |
955 | * @state: PM transition of the system being carried out. | |
956 | * | |
957 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
958 | * device may be registered after this function has returned. | |
1eede070 | 959 | */ |
d1616302 | 960 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 RW |
961 | { |
962 | int error = 0; | |
963 | ||
8e9394ce | 964 | device_lock(dev); |
1eede070 | 965 | |
4d27e9dc RW |
966 | if (dev->pwr_domain) { |
967 | pm_dev_dbg(dev, state, "preparing power domain "); | |
968 | if (dev->pwr_domain->ops.prepare) | |
969 | error = dev->pwr_domain->ops.prepare(dev); | |
970 | suspend_report_result(dev->pwr_domain->ops.prepare, error); | |
971 | if (error) | |
972 | goto End; | |
973 | } else if (dev->type && dev->type->pm) { | |
1eede070 | 974 | pm_dev_dbg(dev, state, "preparing type "); |
9659cc06 RW |
975 | if (dev->type->pm->prepare) |
976 | error = dev->type->pm->prepare(dev); | |
1eede070 RW |
977 | suspend_report_result(dev->type->pm->prepare, error); |
978 | if (error) | |
979 | goto End; | |
9659cc06 | 980 | } else if (dev->class && dev->class->pm) { |
1eede070 | 981 | pm_dev_dbg(dev, state, "preparing class "); |
9659cc06 RW |
982 | if (dev->class->pm->prepare) |
983 | error = dev->class->pm->prepare(dev); | |
1eede070 | 984 | suspend_report_result(dev->class->pm->prepare, error); |
7538e3db RW |
985 | if (error) |
986 | goto End; | |
9659cc06 RW |
987 | } else if (dev->bus && dev->bus->pm) { |
988 | pm_dev_dbg(dev, state, "preparing "); | |
989 | if (dev->bus->pm->prepare) | |
990 | error = dev->bus->pm->prepare(dev); | |
991 | suspend_report_result(dev->bus->pm->prepare, error); | |
1eede070 | 992 | } |
7538e3db | 993 | |
1eede070 | 994 | End: |
8e9394ce | 995 | device_unlock(dev); |
1eede070 RW |
996 | |
997 | return error; | |
998 | } | |
cd59abfc | 999 | |
1eede070 | 1000 | /** |
20d652d7 RW |
1001 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1002 | * @state: PM transition of the system being carried out. | |
1eede070 | 1003 | * |
20d652d7 | 1004 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 RW |
1005 | */ |
1006 | static int dpm_prepare(pm_message_t state) | |
1007 | { | |
1eede070 RW |
1008 | int error = 0; |
1009 | ||
1eede070 | 1010 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
1011 | while (!list_empty(&dpm_list)) { |
1012 | struct device *dev = to_device(dpm_list.next); | |
1013 | ||
1014 | get_device(dev); | |
1eede070 RW |
1015 | mutex_unlock(&dpm_list_mtx); |
1016 | ||
5e928f77 | 1017 | pm_runtime_get_noresume(dev); |
1e75227e RW |
1018 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1019 | pm_wakeup_event(dev, 0); | |
1020 | ||
e8665002 RW |
1021 | pm_runtime_put_sync(dev); |
1022 | error = pm_wakeup_pending() ? | |
1023 | -EBUSY : device_prepare(dev, state); | |
1eede070 RW |
1024 | |
1025 | mutex_lock(&dpm_list_mtx); | |
1026 | if (error) { | |
1eede070 RW |
1027 | if (error == -EAGAIN) { |
1028 | put_device(dev); | |
886a7a33 | 1029 | error = 0; |
1eede070 RW |
1030 | continue; |
1031 | } | |
1e75227e RW |
1032 | printk(KERN_INFO "PM: Device %s not prepared " |
1033 | "for power transition: code %d\n", | |
5c1a07ab | 1034 | dev_name(dev), error); |
1eede070 RW |
1035 | put_device(dev); |
1036 | break; | |
1037 | } | |
b8c76f6a | 1038 | dev->power.in_suspend = true; |
1eede070 | 1039 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1040 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1041 | put_device(dev); |
1042 | } | |
1eede070 | 1043 | mutex_unlock(&dpm_list_mtx); |
cd59abfc AS |
1044 | return error; |
1045 | } | |
1046 | ||
775b64d2 | 1047 | /** |
20d652d7 RW |
1048 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1049 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1050 | * |
20d652d7 RW |
1051 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1052 | * callbacks for them. | |
775b64d2 | 1053 | */ |
d1616302 | 1054 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1055 | { |
1056 | int error; | |
cd59abfc | 1057 | |
775b64d2 | 1058 | might_sleep(); |
1eede070 RW |
1059 | error = dpm_prepare(state); |
1060 | if (!error) | |
1061 | error = dpm_suspend(state); | |
cd59abfc | 1062 | return error; |
cd59abfc | 1063 | } |
d1616302 | 1064 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1065 | |
1066 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1067 | { | |
c80cfb04 BH |
1068 | if (ret) |
1069 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1070 | } |
1071 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1072 | |
1073 | /** | |
1074 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1075 | * @dev: Device to wait for. | |
1076 | * @subordinate: Device that needs to wait for @dev. | |
1077 | */ | |
098dff73 | 1078 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1079 | { |
1080 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1081 | return async_error; |
f8824cee RW |
1082 | } |
1083 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |