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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/base/power/main.c - Where the driver meets power management.
3 *
4 * Copyright (c) 2003 Patrick Mochel
5 * Copyright (c) 2003 Open Source Development Lab
6 *
7 * This file is released under the GPLv2
8 *
9 *
10 * The driver model core calls device_pm_add() when a device is registered.
11 * This will intialize the embedded device_pm_info object in the device
12 * and add it to the list of power-controlled devices. sysfs entries for
13 * controlling device power management will also be added.
14 *
Rafael J. Wysocki1eede072008-05-20 23:00:01 +020015 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 */
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/device.h>
Alan Sterncd59abf2007-09-21 15:36:56 -040021#include <linux/kallsyms.h>
Matthias Kaehlcke11048dc2007-05-23 14:19:41 -070022#include <linux/mutex.h>
Alan Sterncd59abf2007-09-21 15:36:56 -040023#include <linux/pm.h>
24#include <linux/resume-trace.h>
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +010025#include <linux/rwsem.h>
Matthias Kaehlcke11048dc2007-05-23 14:19:41 -070026
Alan Sterncd59abf2007-09-21 15:36:56 -040027#include "../base.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include "power.h"
29
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +010030/*
Rafael J. Wysocki1eede072008-05-20 23:00:01 +020031 * The entries in the dpm_list list are in a depth first order, simply
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +010032 * because children are guaranteed to be discovered after parents, and
33 * are inserted at the back of the list on discovery.
34 *
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +010035 * Since device_pm_add() may be called with a device semaphore held,
36 * we must never try to acquire a device semaphore while holding
37 * dpm_list_mutex.
38 */
39
Rafael J. Wysocki1eede072008-05-20 23:00:01 +020040LIST_HEAD(dpm_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Alan Sterncd59abf2007-09-21 15:36:56 -040042static DEFINE_MUTEX(dpm_list_mtx);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
Rafael J. Wysocki1eede072008-05-20 23:00:01 +020044/*
45 * Set once the preparation of devices for a PM transition has started, reset
46 * before starting to resume devices. Protected by dpm_list_mtx.
47 */
48static bool transition_started;
49
50/**
51 * device_pm_lock - lock the list of active devices used by the PM core
52 */
53void device_pm_lock(void)
54{
55 mutex_lock(&dpm_list_mtx);
56}
57
58/**
59 * device_pm_unlock - unlock the list of active devices used by the PM core
60 */
61void device_pm_unlock(void)
62{
63 mutex_unlock(&dpm_list_mtx);
64}
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +010065
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +010066/**
67 * device_pm_add - add a device to the list of active devices
68 * @dev: Device to be added to the list
69 */
Alan Stern3b98aea2008-08-07 13:06:12 -040070void device_pm_add(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 pr_debug("PM: Adding info for %s:%s\n",
Dmitry Torokhovc48ea602007-04-11 01:37:18 -040073 dev->bus ? dev->bus->name : "No Bus",
74 kobject_name(&dev->kobj));
Matthias Kaehlcke11048dc2007-05-23 14:19:41 -070075 mutex_lock(&dpm_list_mtx);
Rafael J. Wysocki1eede072008-05-20 23:00:01 +020076 if (dev->parent) {
Rafael J. Wysockif5a6d952008-08-09 01:05:13 +020077 if (dev->parent->power.status >= DPM_SUSPENDING)
78 dev_warn(dev, "parent %s should not be sleeping\n",
Rafael J. Wysocki58aca232008-03-12 00:57:22 +010079 dev->parent->bus_id);
Rafael J. Wysocki1eede072008-05-20 23:00:01 +020080 } else if (transition_started) {
81 /*
82 * We refuse to register parentless devices while a PM
83 * transition is in progress in order to avoid leaving them
84 * unhandled down the road
85 */
Arjan van de Ven728f0892008-09-20 19:09:00 -070086 dev_WARN(dev, "Parentless device registered during a PM transaction\n");
Rafael J. Wysocki58aca232008-03-12 00:57:22 +010087 }
Alan Stern3b98aea2008-08-07 13:06:12 -040088
89 list_add_tail(&dev->power.entry, &dpm_list);
Matthias Kaehlcke11048dc2007-05-23 14:19:41 -070090 mutex_unlock(&dpm_list_mtx);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091}
92
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +010093/**
94 * device_pm_remove - remove a device from the list of active devices
95 * @dev: Device to be removed from the list
96 *
97 * This function also removes the device's PM-related sysfs attributes.
98 */
Rafael J. Wysocki9cddad72007-06-13 15:53:34 +020099void device_pm_remove(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100{
101 pr_debug("PM: Removing info for %s:%s\n",
Dmitry Torokhovc48ea602007-04-11 01:37:18 -0400102 dev->bus ? dev->bus->name : "No Bus",
103 kobject_name(&dev->kobj));
Matthias Kaehlcke11048dc2007-05-23 14:19:41 -0700104 mutex_lock(&dpm_list_mtx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 list_del_init(&dev->power.entry);
Matthias Kaehlcke11048dc2007-05-23 14:19:41 -0700106 mutex_unlock(&dpm_list_mtx);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100107}
108
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200109/**
110 * pm_op - execute the PM operation appropiate for given PM event
111 * @dev: Device.
112 * @ops: PM operations to choose from.
113 * @state: PM transition of the system being carried out.
114 */
115static int pm_op(struct device *dev, struct pm_ops *ops, pm_message_t state)
116{
117 int error = 0;
118
119 switch (state.event) {
120#ifdef CONFIG_SUSPEND
121 case PM_EVENT_SUSPEND:
122 if (ops->suspend) {
123 error = ops->suspend(dev);
124 suspend_report_result(ops->suspend, error);
125 }
126 break;
127 case PM_EVENT_RESUME:
128 if (ops->resume) {
129 error = ops->resume(dev);
130 suspend_report_result(ops->resume, error);
131 }
132 break;
133#endif /* CONFIG_SUSPEND */
134#ifdef CONFIG_HIBERNATION
135 case PM_EVENT_FREEZE:
136 case PM_EVENT_QUIESCE:
137 if (ops->freeze) {
138 error = ops->freeze(dev);
139 suspend_report_result(ops->freeze, error);
140 }
141 break;
142 case PM_EVENT_HIBERNATE:
143 if (ops->poweroff) {
144 error = ops->poweroff(dev);
145 suspend_report_result(ops->poweroff, error);
146 }
147 break;
148 case PM_EVENT_THAW:
149 case PM_EVENT_RECOVER:
150 if (ops->thaw) {
151 error = ops->thaw(dev);
152 suspend_report_result(ops->thaw, error);
153 }
154 break;
155 case PM_EVENT_RESTORE:
156 if (ops->restore) {
157 error = ops->restore(dev);
158 suspend_report_result(ops->restore, error);
159 }
160 break;
161#endif /* CONFIG_HIBERNATION */
162 default:
163 error = -EINVAL;
164 }
165 return error;
166}
167
168/**
169 * pm_noirq_op - execute the PM operation appropiate for given PM event
170 * @dev: Device.
171 * @ops: PM operations to choose from.
172 * @state: PM transition of the system being carried out.
173 *
174 * The operation is executed with interrupts disabled by the only remaining
175 * functional CPU in the system.
176 */
177static int pm_noirq_op(struct device *dev, struct pm_ext_ops *ops,
178 pm_message_t state)
179{
180 int error = 0;
181
182 switch (state.event) {
183#ifdef CONFIG_SUSPEND
184 case PM_EVENT_SUSPEND:
185 if (ops->suspend_noirq) {
186 error = ops->suspend_noirq(dev);
187 suspend_report_result(ops->suspend_noirq, error);
188 }
189 break;
190 case PM_EVENT_RESUME:
191 if (ops->resume_noirq) {
192 error = ops->resume_noirq(dev);
193 suspend_report_result(ops->resume_noirq, error);
194 }
195 break;
196#endif /* CONFIG_SUSPEND */
197#ifdef CONFIG_HIBERNATION
198 case PM_EVENT_FREEZE:
199 case PM_EVENT_QUIESCE:
200 if (ops->freeze_noirq) {
201 error = ops->freeze_noirq(dev);
202 suspend_report_result(ops->freeze_noirq, error);
203 }
204 break;
205 case PM_EVENT_HIBERNATE:
206 if (ops->poweroff_noirq) {
207 error = ops->poweroff_noirq(dev);
208 suspend_report_result(ops->poweroff_noirq, error);
209 }
210 break;
211 case PM_EVENT_THAW:
212 case PM_EVENT_RECOVER:
213 if (ops->thaw_noirq) {
214 error = ops->thaw_noirq(dev);
215 suspend_report_result(ops->thaw_noirq, error);
216 }
217 break;
218 case PM_EVENT_RESTORE:
219 if (ops->restore_noirq) {
220 error = ops->restore_noirq(dev);
221 suspend_report_result(ops->restore_noirq, error);
222 }
223 break;
224#endif /* CONFIG_HIBERNATION */
225 default:
226 error = -EINVAL;
227 }
228 return error;
229}
230
231static char *pm_verb(int event)
232{
233 switch (event) {
234 case PM_EVENT_SUSPEND:
235 return "suspend";
236 case PM_EVENT_RESUME:
237 return "resume";
238 case PM_EVENT_FREEZE:
239 return "freeze";
240 case PM_EVENT_QUIESCE:
241 return "quiesce";
242 case PM_EVENT_HIBERNATE:
243 return "hibernate";
244 case PM_EVENT_THAW:
245 return "thaw";
246 case PM_EVENT_RESTORE:
247 return "restore";
248 case PM_EVENT_RECOVER:
249 return "recover";
250 default:
251 return "(unknown PM event)";
252 }
253}
254
255static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info)
256{
257 dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event),
258 ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ?
259 ", may wakeup" : "");
260}
261
262static void pm_dev_err(struct device *dev, pm_message_t state, char *info,
263 int error)
264{
265 printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n",
266 kobject_name(&dev->kobj), pm_verb(state.event), info, error);
267}
268
Alan Sterncd59abf2007-09-21 15:36:56 -0400269/*------------------------- Resume routines -------------------------*/
270
271/**
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200272 * resume_device_noirq - Power on one device (early resume).
Alan Sterncd59abf2007-09-21 15:36:56 -0400273 * @dev: Device.
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200274 * @state: PM transition of the system being carried out.
Alan Sterncd59abf2007-09-21 15:36:56 -0400275 *
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100276 * Must be called with interrupts disabled.
Alan Sterncd59abf2007-09-21 15:36:56 -0400277 */
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200278static int resume_device_noirq(struct device *dev, pm_message_t state)
Alan Sterncd59abf2007-09-21 15:36:56 -0400279{
280 int error = 0;
281
282 TRACE_DEVICE(dev);
283 TRACE_RESUME(0);
284
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200285 if (!dev->bus)
286 goto End;
287
288 if (dev->bus->pm) {
289 pm_dev_dbg(dev, state, "EARLY ");
290 error = pm_noirq_op(dev, dev->bus->pm, state);
291 } else if (dev->bus->resume_early) {
292 pm_dev_dbg(dev, state, "legacy EARLY ");
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100293 error = dev->bus->resume_early(dev);
294 }
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200295 End:
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100296 TRACE_RESUME(error);
297 return error;
298}
299
300/**
301 * dpm_power_up - Power on all regular (non-sysdev) devices.
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200302 * @state: PM transition of the system being carried out.
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100303 *
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200304 * Execute the appropriate "noirq resume" callback for all devices marked
305 * as DPM_OFF_IRQ.
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100306 *
307 * Must be called with interrupts disabled and only one CPU running.
308 */
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200309static void dpm_power_up(pm_message_t state)
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100310{
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200311 struct device *dev;
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100312
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200313 list_for_each_entry(dev, &dpm_list, power.entry)
314 if (dev->power.status > DPM_OFF) {
315 int error;
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100316
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200317 dev->power.status = DPM_OFF;
318 error = resume_device_noirq(dev, state);
319 if (error)
320 pm_dev_err(dev, state, " early", error);
321 }
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100322}
323
324/**
325 * device_power_up - Turn on all devices that need special attention.
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200326 * @state: PM transition of the system being carried out.
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100327 *
328 * Power on system devices, then devices that required we shut them down
329 * with interrupts disabled.
330 *
331 * Must be called with interrupts disabled.
332 */
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200333void device_power_up(pm_message_t state)
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100334{
335 sysdev_resume();
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200336 dpm_power_up(state);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100337}
338EXPORT_SYMBOL_GPL(device_power_up);
339
340/**
341 * resume_device - Restore state for one device.
342 * @dev: Device.
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200343 * @state: PM transition of the system being carried out.
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100344 */
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200345static int resume_device(struct device *dev, pm_message_t state)
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100346{
347 int error = 0;
348
349 TRACE_DEVICE(dev);
350 TRACE_RESUME(0);
Alan Sterncd59abf2007-09-21 15:36:56 -0400351
Rafael J. Wysocki7a8d37a2008-02-25 00:35:04 +0100352 down(&dev->sem);
353
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200354 if (dev->bus) {
355 if (dev->bus->pm) {
356 pm_dev_dbg(dev, state, "");
357 error = pm_op(dev, &dev->bus->pm->base, state);
358 } else if (dev->bus->resume) {
359 pm_dev_dbg(dev, state, "legacy ");
360 error = dev->bus->resume(dev);
361 }
362 if (error)
363 goto End;
Alan Sterncd59abf2007-09-21 15:36:56 -0400364 }
365
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200366 if (dev->type) {
367 if (dev->type->pm) {
368 pm_dev_dbg(dev, state, "type ");
369 error = pm_op(dev, dev->type->pm, state);
370 } else if (dev->type->resume) {
371 pm_dev_dbg(dev, state, "legacy type ");
372 error = dev->type->resume(dev);
373 }
374 if (error)
375 goto End;
Alan Sterncd59abf2007-09-21 15:36:56 -0400376 }
377
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200378 if (dev->class) {
379 if (dev->class->pm) {
380 pm_dev_dbg(dev, state, "class ");
381 error = pm_op(dev, dev->class->pm, state);
382 } else if (dev->class->resume) {
383 pm_dev_dbg(dev, state, "legacy class ");
384 error = dev->class->resume(dev);
385 }
Alan Sterncd59abf2007-09-21 15:36:56 -0400386 }
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200387 End:
Rafael J. Wysocki7a8d37a2008-02-25 00:35:04 +0100388 up(&dev->sem);
389
Alan Sterncd59abf2007-09-21 15:36:56 -0400390 TRACE_RESUME(error);
391 return error;
392}
393
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100394/**
395 * dpm_resume - Resume every device.
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200396 * @state: PM transition of the system being carried out.
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100397 *
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200398 * Execute the appropriate "resume" callback for all devices the status of
399 * which indicates that they are inactive.
Alan Sterncd59abf2007-09-21 15:36:56 -0400400 */
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200401static void dpm_resume(pm_message_t state)
Alan Sterncd59abf2007-09-21 15:36:56 -0400402{
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200403 struct list_head list;
Alan Sterncd59abf2007-09-21 15:36:56 -0400404
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200405 INIT_LIST_HEAD(&list);
406 mutex_lock(&dpm_list_mtx);
407 transition_started = false;
408 while (!list_empty(&dpm_list)) {
409 struct device *dev = to_device(dpm_list.next);
410
411 get_device(dev);
412 if (dev->power.status >= DPM_OFF) {
413 int error;
414
415 dev->power.status = DPM_RESUMING;
416 mutex_unlock(&dpm_list_mtx);
417
418 error = resume_device(dev, state);
419
420 mutex_lock(&dpm_list_mtx);
421 if (error)
422 pm_dev_err(dev, state, "", error);
423 } else if (dev->power.status == DPM_SUSPENDING) {
424 /* Allow new children of the device to be registered */
425 dev->power.status = DPM_RESUMING;
426 }
427 if (!list_empty(&dev->power.entry))
428 list_move_tail(&dev->power.entry, &list);
429 put_device(dev);
Alan Sterncd59abf2007-09-21 15:36:56 -0400430 }
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200431 list_splice(&list, &dpm_list);
432 mutex_unlock(&dpm_list_mtx);
433}
434
435/**
436 * complete_device - Complete a PM transition for given device
437 * @dev: Device.
438 * @state: PM transition of the system being carried out.
439 */
440static void complete_device(struct device *dev, pm_message_t state)
441{
442 down(&dev->sem);
443
444 if (dev->class && dev->class->pm && dev->class->pm->complete) {
445 pm_dev_dbg(dev, state, "completing class ");
446 dev->class->pm->complete(dev);
447 }
448
449 if (dev->type && dev->type->pm && dev->type->pm->complete) {
450 pm_dev_dbg(dev, state, "completing type ");
451 dev->type->pm->complete(dev);
452 }
453
454 if (dev->bus && dev->bus->pm && dev->bus->pm->base.complete) {
455 pm_dev_dbg(dev, state, "completing ");
456 dev->bus->pm->base.complete(dev);
457 }
458
459 up(&dev->sem);
460}
461
462/**
463 * dpm_complete - Complete a PM transition for all devices.
464 * @state: PM transition of the system being carried out.
465 *
466 * Execute the ->complete() callbacks for all devices that are not marked
467 * as DPM_ON.
468 */
469static void dpm_complete(pm_message_t state)
470{
471 struct list_head list;
472
473 INIT_LIST_HEAD(&list);
474 mutex_lock(&dpm_list_mtx);
475 while (!list_empty(&dpm_list)) {
476 struct device *dev = to_device(dpm_list.prev);
477
478 get_device(dev);
479 if (dev->power.status > DPM_ON) {
480 dev->power.status = DPM_ON;
481 mutex_unlock(&dpm_list_mtx);
482
483 complete_device(dev, state);
484
485 mutex_lock(&dpm_list_mtx);
486 }
487 if (!list_empty(&dev->power.entry))
488 list_move(&dev->power.entry, &list);
489 put_device(dev);
490 }
491 list_splice(&list, &dpm_list);
Alan Sterncd59abf2007-09-21 15:36:56 -0400492 mutex_unlock(&dpm_list_mtx);
493}
494
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100495/**
Alan Sterncd59abf2007-09-21 15:36:56 -0400496 * device_resume - Restore state of each device in system.
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200497 * @state: PM transition of the system being carried out.
Alan Sterncd59abf2007-09-21 15:36:56 -0400498 *
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100499 * Resume all the devices, unlock them all, and allow new
500 * devices to be registered once again.
Alan Sterncd59abf2007-09-21 15:36:56 -0400501 */
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200502void device_resume(pm_message_t state)
Alan Sterncd59abf2007-09-21 15:36:56 -0400503{
504 might_sleep();
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200505 dpm_resume(state);
506 dpm_complete(state);
Alan Sterncd59abf2007-09-21 15:36:56 -0400507}
Alan Sterncd59abf2007-09-21 15:36:56 -0400508EXPORT_SYMBOL_GPL(device_resume);
509
510
Alan Sterncd59abf2007-09-21 15:36:56 -0400511/*------------------------- Suspend routines -------------------------*/
512
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200513/**
514 * resume_event - return a PM message representing the resume event
515 * corresponding to given sleep state.
516 * @sleep_state: PM message representing a sleep state.
517 */
518static pm_message_t resume_event(pm_message_t sleep_state)
Alan Sterncd59abf2007-09-21 15:36:56 -0400519{
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200520 switch (sleep_state.event) {
521 case PM_EVENT_SUSPEND:
522 return PMSG_RESUME;
523 case PM_EVENT_FREEZE:
524 case PM_EVENT_QUIESCE:
525 return PMSG_RECOVER;
526 case PM_EVENT_HIBERNATE:
527 return PMSG_RESTORE;
Alan Sterncd59abf2007-09-21 15:36:56 -0400528 }
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200529 return PMSG_ON;
Alan Sterncd59abf2007-09-21 15:36:56 -0400530}
531
532/**
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200533 * suspend_device_noirq - Shut down one device (late suspend).
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100534 * @dev: Device.
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200535 * @state: PM transition of the system being carried out.
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100536 *
537 * This is called with interrupts off and only a single CPU running.
538 */
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200539static int suspend_device_noirq(struct device *dev, pm_message_t state)
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100540{
541 int error = 0;
542
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200543 if (!dev->bus)
544 return 0;
545
546 if (dev->bus->pm) {
547 pm_dev_dbg(dev, state, "LATE ");
548 error = pm_noirq_op(dev, dev->bus->pm, state);
549 } else if (dev->bus->suspend_late) {
550 pm_dev_dbg(dev, state, "legacy LATE ");
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100551 error = dev->bus->suspend_late(dev, state);
552 suspend_report_result(dev->bus->suspend_late, error);
553 }
554 return error;
555}
556
557/**
558 * device_power_down - Shut down special devices.
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200559 * @state: PM transition of the system being carried out.
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100560 *
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200561 * Power down devices that require interrupts to be disabled.
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100562 * Then power down system devices.
563 *
564 * Must be called with interrupts disabled and only one CPU running.
565 */
566int device_power_down(pm_message_t state)
567{
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200568 struct device *dev;
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100569 int error = 0;
570
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200571 list_for_each_entry_reverse(dev, &dpm_list, power.entry) {
572 error = suspend_device_noirq(dev, state);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100573 if (error) {
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200574 pm_dev_err(dev, state, " late", error);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100575 break;
576 }
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200577 dev->power.status = DPM_OFF_IRQ;
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100578 }
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100579 if (!error)
580 error = sysdev_suspend(state);
581 if (error)
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200582 dpm_power_up(resume_event(state));
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100583 return error;
584}
585EXPORT_SYMBOL_GPL(device_power_down);
586
587/**
Alan Sterncd59abf2007-09-21 15:36:56 -0400588 * suspend_device - Save state of one device.
589 * @dev: Device.
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200590 * @state: PM transition of the system being carried out.
Alan Sterncd59abf2007-09-21 15:36:56 -0400591 */
Adrian Bunk19e20c92008-02-03 22:55:18 +0100592static int suspend_device(struct device *dev, pm_message_t state)
Alan Sterncd59abf2007-09-21 15:36:56 -0400593{
594 int error = 0;
595
Rafael J. Wysocki7a8d37a2008-02-25 00:35:04 +0100596 down(&dev->sem);
597
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200598 if (dev->class) {
599 if (dev->class->pm) {
600 pm_dev_dbg(dev, state, "class ");
601 error = pm_op(dev, dev->class->pm, state);
602 } else if (dev->class->suspend) {
603 pm_dev_dbg(dev, state, "legacy class ");
604 error = dev->class->suspend(dev, state);
605 suspend_report_result(dev->class->suspend, error);
606 }
607 if (error)
608 goto End;
Alan Sterncd59abf2007-09-21 15:36:56 -0400609 }
610
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200611 if (dev->type) {
612 if (dev->type->pm) {
613 pm_dev_dbg(dev, state, "type ");
614 error = pm_op(dev, dev->type->pm, state);
615 } else if (dev->type->suspend) {
616 pm_dev_dbg(dev, state, "legacy type ");
617 error = dev->type->suspend(dev, state);
618 suspend_report_result(dev->type->suspend, error);
619 }
620 if (error)
621 goto End;
Alan Sterncd59abf2007-09-21 15:36:56 -0400622 }
623
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200624 if (dev->bus) {
625 if (dev->bus->pm) {
626 pm_dev_dbg(dev, state, "");
627 error = pm_op(dev, &dev->bus->pm->base, state);
628 } else if (dev->bus->suspend) {
629 pm_dev_dbg(dev, state, "legacy ");
630 error = dev->bus->suspend(dev, state);
631 suspend_report_result(dev->bus->suspend, error);
632 }
Alan Sterncd59abf2007-09-21 15:36:56 -0400633 }
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200634 End:
Rafael J. Wysocki7a8d37a2008-02-25 00:35:04 +0100635 up(&dev->sem);
636
Alan Sterncd59abf2007-09-21 15:36:56 -0400637 return error;
638}
639
640/**
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100641 * dpm_suspend - Suspend every device.
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200642 * @state: PM transition of the system being carried out.
Alan Sterncd59abf2007-09-21 15:36:56 -0400643 *
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200644 * Execute the appropriate "suspend" callbacks for all devices.
Alan Sterncd59abf2007-09-21 15:36:56 -0400645 */
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100646static int dpm_suspend(pm_message_t state)
Alan Sterncd59abf2007-09-21 15:36:56 -0400647{
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200648 struct list_head list;
Alan Sterncd59abf2007-09-21 15:36:56 -0400649 int error = 0;
650
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200651 INIT_LIST_HEAD(&list);
Alan Sterncd59abf2007-09-21 15:36:56 -0400652 mutex_lock(&dpm_list_mtx);
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200653 while (!list_empty(&dpm_list)) {
654 struct device *dev = to_device(dpm_list.prev);
Alan Sterncd59abf2007-09-21 15:36:56 -0400655
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200656 get_device(dev);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100657 mutex_unlock(&dpm_list_mtx);
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200658
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100659 error = suspend_device(dev, state);
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200660
Alan Stern1b3cbec2008-02-29 11:50:22 -0500661 mutex_lock(&dpm_list_mtx);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100662 if (error) {
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200663 pm_dev_err(dev, state, "", error);
664 put_device(dev);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100665 break;
666 }
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200667 dev->power.status = DPM_OFF;
Rafael J. Wysocki7a8d37a2008-02-25 00:35:04 +0100668 if (!list_empty(&dev->power.entry))
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200669 list_move(&dev->power.entry, &list);
670 put_device(dev);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100671 }
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200672 list_splice(&list, dpm_list.prev);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100673 mutex_unlock(&dpm_list_mtx);
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200674 return error;
675}
676
677/**
678 * prepare_device - Execute the ->prepare() callback(s) for given device.
679 * @dev: Device.
680 * @state: PM transition of the system being carried out.
681 */
682static int prepare_device(struct device *dev, pm_message_t state)
683{
684 int error = 0;
685
686 down(&dev->sem);
687
688 if (dev->bus && dev->bus->pm && dev->bus->pm->base.prepare) {
689 pm_dev_dbg(dev, state, "preparing ");
690 error = dev->bus->pm->base.prepare(dev);
691 suspend_report_result(dev->bus->pm->base.prepare, error);
692 if (error)
693 goto End;
694 }
695
696 if (dev->type && dev->type->pm && dev->type->pm->prepare) {
697 pm_dev_dbg(dev, state, "preparing type ");
698 error = dev->type->pm->prepare(dev);
699 suspend_report_result(dev->type->pm->prepare, error);
700 if (error)
701 goto End;
702 }
703
704 if (dev->class && dev->class->pm && dev->class->pm->prepare) {
705 pm_dev_dbg(dev, state, "preparing class ");
706 error = dev->class->pm->prepare(dev);
707 suspend_report_result(dev->class->pm->prepare, error);
708 }
709 End:
710 up(&dev->sem);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100711
712 return error;
713}
714
715/**
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200716 * dpm_prepare - Prepare all devices for a PM transition.
717 * @state: PM transition of the system being carried out.
Alan Sterncd59abf2007-09-21 15:36:56 -0400718 *
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200719 * Execute the ->prepare() callback for all devices.
720 */
721static int dpm_prepare(pm_message_t state)
722{
723 struct list_head list;
724 int error = 0;
725
726 INIT_LIST_HEAD(&list);
727 mutex_lock(&dpm_list_mtx);
728 transition_started = true;
729 while (!list_empty(&dpm_list)) {
730 struct device *dev = to_device(dpm_list.next);
731
732 get_device(dev);
733 dev->power.status = DPM_PREPARING;
734 mutex_unlock(&dpm_list_mtx);
735
736 error = prepare_device(dev, state);
737
738 mutex_lock(&dpm_list_mtx);
739 if (error) {
740 dev->power.status = DPM_ON;
741 if (error == -EAGAIN) {
742 put_device(dev);
743 continue;
744 }
745 printk(KERN_ERR "PM: Failed to prepare device %s "
746 "for power transition: error %d\n",
747 kobject_name(&dev->kobj), error);
748 put_device(dev);
749 break;
750 }
751 dev->power.status = DPM_SUSPENDING;
752 if (!list_empty(&dev->power.entry))
753 list_move_tail(&dev->power.entry, &list);
754 put_device(dev);
755 }
756 list_splice(&list, &dpm_list);
757 mutex_unlock(&dpm_list_mtx);
758 return error;
759}
760
761/**
762 * device_suspend - Save state and stop all devices in system.
763 * @state: PM transition of the system being carried out.
764 *
765 * Prepare and suspend all devices.
Alan Sterncd59abf2007-09-21 15:36:56 -0400766 */
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100767int device_suspend(pm_message_t state)
Alan Sterncd59abf2007-09-21 15:36:56 -0400768{
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100769 int error;
Alan Sterncd59abf2007-09-21 15:36:56 -0400770
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100771 might_sleep();
Rafael J. Wysocki1eede072008-05-20 23:00:01 +0200772 error = dpm_prepare(state);
773 if (!error)
774 error = dpm_suspend(state);
Alan Sterncd59abf2007-09-21 15:36:56 -0400775 return error;
Alan Sterncd59abf2007-09-21 15:36:56 -0400776}
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100777EXPORT_SYMBOL_GPL(device_suspend);
Alan Sterncd59abf2007-09-21 15:36:56 -0400778
779void __suspend_report_result(const char *function, void *fn, int ret)
780{
781 if (ret) {
782 printk(KERN_ERR "%s(): ", function);
Linus Torvaldsa442ac52008-05-15 17:50:37 -0700783 print_fn_descriptor_symbol("%s returns ", fn);
Alan Sterncd59abf2007-09-21 15:36:56 -0400784 printk("%d\n", ret);
785 }
786}
787EXPORT_SYMBOL_GPL(__suspend_report_result);