dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / drivers / base / power / wakeup.c
blobe613633ffe9cf0b7d821f69a8b5381716fb9e28e
1 /*
2 * drivers/base/power/wakeup.c - System wakeup events framework
4 * Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
6 * This file is released under the GPLv2.
7 */
9 #include <linux/device.h>
10 #include <linux/slab.h>
11 #include <linux/sched.h>
12 #include <linux/capability.h>
13 #include <linux/export.h>
14 #include <linux/suspend.h>
15 #include <linux/seq_file.h>
16 #include <linux/debugfs.h>
17 #include <linux/pm_wakeirq.h>
18 #include <trace/events/power.h>
20 #include "power.h"
23 * If set, the suspend/hibernate code will abort transitions to a sleep state
24 * if wakeup events are registered during or immediately before the transition.
26 bool events_check_enabled __read_mostly;
28 /* First wakeup IRQ seen by the kernel in the last cycle. */
29 unsigned int pm_wakeup_irq __read_mostly;
31 /* If set and the system is suspending, terminate the suspend. */
32 static bool pm_abort_suspend __read_mostly;
35 * Combined counters of registered wakeup events and wakeup events in progress.
36 * They need to be modified together atomically, so it's better to use one
37 * atomic variable to hold them both.
39 static atomic_t combined_event_count = ATOMIC_INIT(0);
41 #define IN_PROGRESS_BITS (sizeof(int) * 4)
42 #define MAX_IN_PROGRESS ((1 << IN_PROGRESS_BITS) - 1)
44 static void split_counters(unsigned int *cnt, unsigned int *inpr)
46 unsigned int comb = atomic_read(&combined_event_count);
48 *cnt = (comb >> IN_PROGRESS_BITS);
49 *inpr = comb & MAX_IN_PROGRESS;
52 /* A preserved old value of the events counter. */
53 static unsigned int saved_count;
55 static DEFINE_SPINLOCK(events_lock);
57 static void pm_wakeup_timer_fn(unsigned long data);
59 static LIST_HEAD(wakeup_sources);
61 static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue);
63 DEFINE_STATIC_SRCU(wakeup_srcu);
65 static struct wakeup_source deleted_ws = {
66 .name = "deleted",
67 .lock = __SPIN_LOCK_UNLOCKED(deleted_ws.lock),
70 /**
71 * wakeup_source_prepare - Prepare a new wakeup source for initialization.
72 * @ws: Wakeup source to prepare.
73 * @name: Pointer to the name of the new wakeup source.
75 * Callers must ensure that the @name string won't be freed when @ws is still in
76 * use.
78 void wakeup_source_prepare(struct wakeup_source *ws, const char *name)
80 if (ws) {
81 memset(ws, 0, sizeof(*ws));
82 ws->name = name;
85 EXPORT_SYMBOL_GPL(wakeup_source_prepare);
87 /**
88 * wakeup_source_create - Create a struct wakeup_source object.
89 * @name: Name of the new wakeup source.
91 struct wakeup_source *wakeup_source_create(const char *name)
93 struct wakeup_source *ws;
95 ws = kmalloc(sizeof(*ws), GFP_KERNEL);
96 if (!ws)
97 return NULL;
99 wakeup_source_prepare(ws, name ? kstrdup_const(name, GFP_KERNEL) : NULL);
100 return ws;
102 EXPORT_SYMBOL_GPL(wakeup_source_create);
105 * wakeup_source_drop - Prepare a struct wakeup_source object for destruction.
106 * @ws: Wakeup source to prepare for destruction.
108 * Callers must ensure that __pm_stay_awake() or __pm_wakeup_event() will never
109 * be run in parallel with this function for the same wakeup source object.
111 void wakeup_source_drop(struct wakeup_source *ws)
113 if (!ws)
114 return;
116 del_timer_sync(&ws->timer);
117 __pm_relax(ws);
119 EXPORT_SYMBOL_GPL(wakeup_source_drop);
122 * Record wakeup_source statistics being deleted into a dummy wakeup_source.
124 static void wakeup_source_record(struct wakeup_source *ws)
126 unsigned long flags;
128 spin_lock_irqsave(&deleted_ws.lock, flags);
130 if (ws->event_count) {
131 deleted_ws.total_time =
132 ktime_add(deleted_ws.total_time, ws->total_time);
133 deleted_ws.prevent_sleep_time =
134 ktime_add(deleted_ws.prevent_sleep_time,
135 ws->prevent_sleep_time);
136 deleted_ws.max_time =
137 ktime_compare(deleted_ws.max_time, ws->max_time) > 0 ?
138 deleted_ws.max_time : ws->max_time;
139 deleted_ws.event_count += ws->event_count;
140 deleted_ws.active_count += ws->active_count;
141 deleted_ws.relax_count += ws->relax_count;
142 deleted_ws.expire_count += ws->expire_count;
143 deleted_ws.wakeup_count += ws->wakeup_count;
146 spin_unlock_irqrestore(&deleted_ws.lock, flags);
150 * wakeup_source_destroy - Destroy a struct wakeup_source object.
151 * @ws: Wakeup source to destroy.
153 * Use only for wakeup source objects created with wakeup_source_create().
155 void wakeup_source_destroy(struct wakeup_source *ws)
157 if (!ws)
158 return;
160 wakeup_source_drop(ws);
161 wakeup_source_record(ws);
162 kfree_const(ws->name);
163 kfree(ws);
165 EXPORT_SYMBOL_GPL(wakeup_source_destroy);
168 * wakeup_source_add - Add given object to the list of wakeup sources.
169 * @ws: Wakeup source object to add to the list.
171 void wakeup_source_add(struct wakeup_source *ws)
173 unsigned long flags;
175 if (WARN_ON(!ws))
176 return;
178 spin_lock_init(&ws->lock);
179 setup_timer(&ws->timer, pm_wakeup_timer_fn, (unsigned long)ws);
180 ws->active = false;
181 ws->last_time = ktime_get();
183 spin_lock_irqsave(&events_lock, flags);
184 list_add_rcu(&ws->entry, &wakeup_sources);
185 spin_unlock_irqrestore(&events_lock, flags);
187 EXPORT_SYMBOL_GPL(wakeup_source_add);
190 * wakeup_source_remove - Remove given object from the wakeup sources list.
191 * @ws: Wakeup source object to remove from the list.
193 void wakeup_source_remove(struct wakeup_source *ws)
195 unsigned long flags;
197 if (WARN_ON(!ws))
198 return;
200 spin_lock_irqsave(&events_lock, flags);
201 list_del_rcu(&ws->entry);
202 spin_unlock_irqrestore(&events_lock, flags);
203 synchronize_srcu(&wakeup_srcu);
205 EXPORT_SYMBOL_GPL(wakeup_source_remove);
208 * wakeup_source_register - Create wakeup source and add it to the list.
209 * @name: Name of the wakeup source to register.
211 struct wakeup_source *wakeup_source_register(const char *name)
213 struct wakeup_source *ws;
215 ws = wakeup_source_create(name);
216 if (ws)
217 wakeup_source_add(ws);
219 return ws;
221 EXPORT_SYMBOL_GPL(wakeup_source_register);
224 * wakeup_source_unregister - Remove wakeup source from the list and remove it.
225 * @ws: Wakeup source object to unregister.
227 void wakeup_source_unregister(struct wakeup_source *ws)
229 if (ws) {
230 wakeup_source_remove(ws);
231 wakeup_source_destroy(ws);
234 EXPORT_SYMBOL_GPL(wakeup_source_unregister);
237 * device_wakeup_attach - Attach a wakeup source object to a device object.
238 * @dev: Device to handle.
239 * @ws: Wakeup source object to attach to @dev.
241 * This causes @dev to be treated as a wakeup device.
243 static int device_wakeup_attach(struct device *dev, struct wakeup_source *ws)
245 spin_lock_irq(&dev->power.lock);
246 if (dev->power.wakeup) {
247 spin_unlock_irq(&dev->power.lock);
248 return -EEXIST;
250 dev->power.wakeup = ws;
251 spin_unlock_irq(&dev->power.lock);
252 return 0;
256 * device_wakeup_enable - Enable given device to be a wakeup source.
257 * @dev: Device to handle.
259 * Create a wakeup source object, register it and attach it to @dev.
261 int device_wakeup_enable(struct device *dev)
263 struct wakeup_source *ws;
264 int ret;
266 if (!dev || !dev->power.can_wakeup)
267 return -EINVAL;
269 ws = wakeup_source_register(dev_name(dev));
270 if (!ws)
271 return -ENOMEM;
273 ret = device_wakeup_attach(dev, ws);
274 if (ret)
275 wakeup_source_unregister(ws);
277 return ret;
279 EXPORT_SYMBOL_GPL(device_wakeup_enable);
282 * device_wakeup_attach_irq - Attach a wakeirq to a wakeup source
283 * @dev: Device to handle
284 * @wakeirq: Device specific wakeirq entry
286 * Attach a device wakeirq to the wakeup source so the device
287 * wake IRQ can be configured automatically for suspend and
288 * resume.
290 * Call under the device's power.lock lock.
292 int device_wakeup_attach_irq(struct device *dev,
293 struct wake_irq *wakeirq)
295 struct wakeup_source *ws;
297 ws = dev->power.wakeup;
298 if (!ws) {
299 dev_err(dev, "forgot to call call device_init_wakeup?\n");
300 return -EINVAL;
303 if (ws->wakeirq)
304 return -EEXIST;
306 ws->wakeirq = wakeirq;
307 return 0;
311 * device_wakeup_detach_irq - Detach a wakeirq from a wakeup source
312 * @dev: Device to handle
314 * Removes a device wakeirq from the wakeup source.
316 * Call under the device's power.lock lock.
318 void device_wakeup_detach_irq(struct device *dev)
320 struct wakeup_source *ws;
322 ws = dev->power.wakeup;
323 if (ws)
324 ws->wakeirq = NULL;
328 * device_wakeup_arm_wake_irqs(void)
330 * Itereates over the list of device wakeirqs to arm them.
332 void device_wakeup_arm_wake_irqs(void)
334 struct wakeup_source *ws;
335 int srcuidx;
337 srcuidx = srcu_read_lock(&wakeup_srcu);
338 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
339 if (ws->wakeirq)
340 dev_pm_arm_wake_irq(ws->wakeirq);
342 srcu_read_unlock(&wakeup_srcu, srcuidx);
346 * device_wakeup_disarm_wake_irqs(void)
348 * Itereates over the list of device wakeirqs to disarm them.
350 void device_wakeup_disarm_wake_irqs(void)
352 struct wakeup_source *ws;
353 int srcuidx;
355 srcuidx = srcu_read_lock(&wakeup_srcu);
356 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
357 if (ws->wakeirq)
358 dev_pm_disarm_wake_irq(ws->wakeirq);
360 srcu_read_unlock(&wakeup_srcu, srcuidx);
364 * device_wakeup_detach - Detach a device's wakeup source object from it.
365 * @dev: Device to detach the wakeup source object from.
367 * After it returns, @dev will not be treated as a wakeup device any more.
369 static struct wakeup_source *device_wakeup_detach(struct device *dev)
371 struct wakeup_source *ws;
373 spin_lock_irq(&dev->power.lock);
374 ws = dev->power.wakeup;
375 dev->power.wakeup = NULL;
376 spin_unlock_irq(&dev->power.lock);
377 return ws;
381 * device_wakeup_disable - Do not regard a device as a wakeup source any more.
382 * @dev: Device to handle.
384 * Detach the @dev's wakeup source object from it, unregister this wakeup source
385 * object and destroy it.
387 int device_wakeup_disable(struct device *dev)
389 struct wakeup_source *ws;
391 if (!dev || !dev->power.can_wakeup)
392 return -EINVAL;
394 ws = device_wakeup_detach(dev);
395 if (ws)
396 wakeup_source_unregister(ws);
398 return 0;
400 EXPORT_SYMBOL_GPL(device_wakeup_disable);
403 * device_set_wakeup_capable - Set/reset device wakeup capability flag.
404 * @dev: Device to handle.
405 * @capable: Whether or not @dev is capable of waking up the system from sleep.
407 * If @capable is set, set the @dev's power.can_wakeup flag and add its
408 * wakeup-related attributes to sysfs. Otherwise, unset the @dev's
409 * power.can_wakeup flag and remove its wakeup-related attributes from sysfs.
411 * This function may sleep and it can't be called from any context where
412 * sleeping is not allowed.
414 void device_set_wakeup_capable(struct device *dev, bool capable)
416 if (!!dev->power.can_wakeup == !!capable)
417 return;
419 if (device_is_registered(dev) && !list_empty(&dev->power.entry)) {
420 if (capable) {
421 if (wakeup_sysfs_add(dev))
422 return;
423 } else {
424 wakeup_sysfs_remove(dev);
427 dev->power.can_wakeup = capable;
429 EXPORT_SYMBOL_GPL(device_set_wakeup_capable);
432 * device_init_wakeup - Device wakeup initialization.
433 * @dev: Device to handle.
434 * @enable: Whether or not to enable @dev as a wakeup device.
436 * By default, most devices should leave wakeup disabled. The exceptions are
437 * devices that everyone expects to be wakeup sources: keyboards, power buttons,
438 * possibly network interfaces, etc. Also, devices that don't generate their
439 * own wakeup requests but merely forward requests from one bus to another
440 * (like PCI bridges) should have wakeup enabled by default.
442 int device_init_wakeup(struct device *dev, bool enable)
444 int ret = 0;
446 if (!dev)
447 return -EINVAL;
449 if (enable) {
450 device_set_wakeup_capable(dev, true);
451 ret = device_wakeup_enable(dev);
452 } else {
453 if (dev->power.can_wakeup)
454 device_wakeup_disable(dev);
456 device_set_wakeup_capable(dev, false);
459 return ret;
461 EXPORT_SYMBOL_GPL(device_init_wakeup);
464 * device_set_wakeup_enable - Enable or disable a device to wake up the system.
465 * @dev: Device to handle.
467 int device_set_wakeup_enable(struct device *dev, bool enable)
469 if (!dev || !dev->power.can_wakeup)
470 return -EINVAL;
472 return enable ? device_wakeup_enable(dev) : device_wakeup_disable(dev);
474 EXPORT_SYMBOL_GPL(device_set_wakeup_enable);
477 * wakeup_source_not_registered - validate the given wakeup source.
478 * @ws: Wakeup source to be validated.
480 static bool wakeup_source_not_registered(struct wakeup_source *ws)
483 * Use timer struct to check if the given source is initialized
484 * by wakeup_source_add.
486 return ws->timer.function != pm_wakeup_timer_fn ||
487 ws->timer.data != (unsigned long)ws;
491 * The functions below use the observation that each wakeup event starts a
492 * period in which the system should not be suspended. The moment this period
493 * will end depends on how the wakeup event is going to be processed after being
494 * detected and all of the possible cases can be divided into two distinct
495 * groups.
497 * First, a wakeup event may be detected by the same functional unit that will
498 * carry out the entire processing of it and possibly will pass it to user space
499 * for further processing. In that case the functional unit that has detected
500 * the event may later "close" the "no suspend" period associated with it
501 * directly as soon as it has been dealt with. The pair of pm_stay_awake() and
502 * pm_relax(), balanced with each other, is supposed to be used in such
503 * situations.
505 * Second, a wakeup event may be detected by one functional unit and processed
506 * by another one. In that case the unit that has detected it cannot really
507 * "close" the "no suspend" period associated with it, unless it knows in
508 * advance what's going to happen to the event during processing. This
509 * knowledge, however, may not be available to it, so it can simply specify time
510 * to wait before the system can be suspended and pass it as the second
511 * argument of pm_wakeup_event().
513 * It is valid to call pm_relax() after pm_wakeup_event(), in which case the
514 * "no suspend" period will be ended either by the pm_relax(), or by the timer
515 * function executed when the timer expires, whichever comes first.
519 * wakup_source_activate - Mark given wakeup source as active.
520 * @ws: Wakeup source to handle.
522 * Update the @ws' statistics and, if @ws has just been activated, notify the PM
523 * core of the event by incrementing the counter of of wakeup events being
524 * processed.
526 static void wakeup_source_activate(struct wakeup_source *ws)
528 unsigned int cec;
530 if (WARN_ONCE(wakeup_source_not_registered(ws),
531 "unregistered wakeup source\n"))
532 return;
535 * active wakeup source should bring the system
536 * out of PM_SUSPEND_FREEZE state
538 freeze_wake();
540 ws->active = true;
541 ws->active_count++;
542 ws->last_time = ktime_get();
543 if (ws->autosleep_enabled)
544 ws->start_prevent_time = ws->last_time;
546 /* Increment the counter of events in progress. */
547 cec = atomic_inc_return(&combined_event_count);
549 trace_wakeup_source_activate(ws->name, cec);
553 * wakeup_source_report_event - Report wakeup event using the given source.
554 * @ws: Wakeup source to report the event for.
556 static void wakeup_source_report_event(struct wakeup_source *ws)
558 ws->event_count++;
559 /* This is racy, but the counter is approximate anyway. */
560 if (events_check_enabled)
561 ws->wakeup_count++;
563 if (!ws->active)
564 wakeup_source_activate(ws);
568 * __pm_stay_awake - Notify the PM core of a wakeup event.
569 * @ws: Wakeup source object associated with the source of the event.
571 * It is safe to call this function from interrupt context.
573 void __pm_stay_awake(struct wakeup_source *ws)
575 unsigned long flags;
577 if (!ws)
578 return;
580 spin_lock_irqsave(&ws->lock, flags);
582 wakeup_source_report_event(ws);
583 del_timer(&ws->timer);
584 ws->timer_expires = 0;
586 spin_unlock_irqrestore(&ws->lock, flags);
588 EXPORT_SYMBOL_GPL(__pm_stay_awake);
591 * pm_stay_awake - Notify the PM core that a wakeup event is being processed.
592 * @dev: Device the wakeup event is related to.
594 * Notify the PM core of a wakeup event (signaled by @dev) by calling
595 * __pm_stay_awake for the @dev's wakeup source object.
597 * Call this function after detecting of a wakeup event if pm_relax() is going
598 * to be called directly after processing the event (and possibly passing it to
599 * user space for further processing).
601 void pm_stay_awake(struct device *dev)
603 unsigned long flags;
605 if (!dev)
606 return;
608 spin_lock_irqsave(&dev->power.lock, flags);
609 __pm_stay_awake(dev->power.wakeup);
610 spin_unlock_irqrestore(&dev->power.lock, flags);
612 EXPORT_SYMBOL_GPL(pm_stay_awake);
614 #ifdef CONFIG_PM_AUTOSLEEP
615 static void update_prevent_sleep_time(struct wakeup_source *ws, ktime_t now)
617 ktime_t delta = ktime_sub(now, ws->start_prevent_time);
618 ws->prevent_sleep_time = ktime_add(ws->prevent_sleep_time, delta);
620 #else
621 static inline void update_prevent_sleep_time(struct wakeup_source *ws,
622 ktime_t now) {}
623 #endif
626 * wakup_source_deactivate - Mark given wakeup source as inactive.
627 * @ws: Wakeup source to handle.
629 * Update the @ws' statistics and notify the PM core that the wakeup source has
630 * become inactive by decrementing the counter of wakeup events being processed
631 * and incrementing the counter of registered wakeup events.
633 static void wakeup_source_deactivate(struct wakeup_source *ws)
635 unsigned int cnt, inpr, cec;
636 ktime_t duration;
637 ktime_t now;
639 ws->relax_count++;
641 * __pm_relax() may be called directly or from a timer function.
642 * If it is called directly right after the timer function has been
643 * started, but before the timer function calls __pm_relax(), it is
644 * possible that __pm_stay_awake() will be called in the meantime and
645 * will set ws->active. Then, ws->active may be cleared immediately
646 * by the __pm_relax() called from the timer function, but in such a
647 * case ws->relax_count will be different from ws->active_count.
649 if (ws->relax_count != ws->active_count) {
650 ws->relax_count--;
651 return;
654 ws->active = false;
656 now = ktime_get();
657 duration = ktime_sub(now, ws->last_time);
658 ws->total_time = ktime_add(ws->total_time, duration);
659 if (ktime_to_ns(duration) > ktime_to_ns(ws->max_time))
660 ws->max_time = duration;
662 ws->last_time = now;
663 del_timer(&ws->timer);
664 ws->timer_expires = 0;
666 if (ws->autosleep_enabled)
667 update_prevent_sleep_time(ws, now);
670 * Increment the counter of registered wakeup events and decrement the
671 * couter of wakeup events in progress simultaneously.
673 cec = atomic_add_return(MAX_IN_PROGRESS, &combined_event_count);
674 trace_wakeup_source_deactivate(ws->name, cec);
676 split_counters(&cnt, &inpr);
677 if (!inpr && waitqueue_active(&wakeup_count_wait_queue))
678 wake_up(&wakeup_count_wait_queue);
682 * __pm_relax - Notify the PM core that processing of a wakeup event has ended.
683 * @ws: Wakeup source object associated with the source of the event.
685 * Call this function for wakeup events whose processing started with calling
686 * __pm_stay_awake().
688 * It is safe to call it from interrupt context.
690 void __pm_relax(struct wakeup_source *ws)
692 unsigned long flags;
694 if (!ws)
695 return;
697 spin_lock_irqsave(&ws->lock, flags);
698 if (ws->active)
699 wakeup_source_deactivate(ws);
700 spin_unlock_irqrestore(&ws->lock, flags);
702 EXPORT_SYMBOL_GPL(__pm_relax);
705 * pm_relax - Notify the PM core that processing of a wakeup event has ended.
706 * @dev: Device that signaled the event.
708 * Execute __pm_relax() for the @dev's wakeup source object.
710 void pm_relax(struct device *dev)
712 unsigned long flags;
714 if (!dev)
715 return;
717 spin_lock_irqsave(&dev->power.lock, flags);
718 __pm_relax(dev->power.wakeup);
719 spin_unlock_irqrestore(&dev->power.lock, flags);
721 EXPORT_SYMBOL_GPL(pm_relax);
724 * pm_wakeup_timer_fn - Delayed finalization of a wakeup event.
725 * @data: Address of the wakeup source object associated with the event source.
727 * Call wakeup_source_deactivate() for the wakeup source whose address is stored
728 * in @data if it is currently active and its timer has not been canceled and
729 * the expiration time of the timer is not in future.
731 static void pm_wakeup_timer_fn(unsigned long data)
733 struct wakeup_source *ws = (struct wakeup_source *)data;
734 unsigned long flags;
736 spin_lock_irqsave(&ws->lock, flags);
738 if (ws->active && ws->timer_expires
739 && time_after_eq(jiffies, ws->timer_expires)) {
740 wakeup_source_deactivate(ws);
741 ws->expire_count++;
744 spin_unlock_irqrestore(&ws->lock, flags);
748 * __pm_wakeup_event - Notify the PM core of a wakeup event.
749 * @ws: Wakeup source object associated with the event source.
750 * @msec: Anticipated event processing time (in milliseconds).
752 * Notify the PM core of a wakeup event whose source is @ws that will take
753 * approximately @msec milliseconds to be processed by the kernel. If @ws is
754 * not active, activate it. If @msec is nonzero, set up the @ws' timer to
755 * execute pm_wakeup_timer_fn() in future.
757 * It is safe to call this function from interrupt context.
759 void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec)
761 unsigned long flags;
762 unsigned long expires;
764 if (!ws)
765 return;
767 spin_lock_irqsave(&ws->lock, flags);
769 wakeup_source_report_event(ws);
771 if (!msec) {
772 wakeup_source_deactivate(ws);
773 goto unlock;
776 expires = jiffies + msecs_to_jiffies(msec);
777 if (!expires)
778 expires = 1;
780 if (!ws->timer_expires || time_after(expires, ws->timer_expires)) {
781 mod_timer(&ws->timer, expires);
782 ws->timer_expires = expires;
785 unlock:
786 spin_unlock_irqrestore(&ws->lock, flags);
788 EXPORT_SYMBOL_GPL(__pm_wakeup_event);
792 * pm_wakeup_event - Notify the PM core of a wakeup event.
793 * @dev: Device the wakeup event is related to.
794 * @msec: Anticipated event processing time (in milliseconds).
796 * Call __pm_wakeup_event() for the @dev's wakeup source object.
798 void pm_wakeup_event(struct device *dev, unsigned int msec)
800 unsigned long flags;
802 if (!dev)
803 return;
805 spin_lock_irqsave(&dev->power.lock, flags);
806 __pm_wakeup_event(dev->power.wakeup, msec);
807 spin_unlock_irqrestore(&dev->power.lock, flags);
809 EXPORT_SYMBOL_GPL(pm_wakeup_event);
811 void pm_print_active_wakeup_sources(void)
813 struct wakeup_source *ws;
814 int srcuidx, active = 0;
815 struct wakeup_source *last_activity_ws = NULL;
817 srcuidx = srcu_read_lock(&wakeup_srcu);
818 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
819 if (ws->active) {
820 pr_info("active wakeup source: %s\n", ws->name);
821 active = 1;
822 } else if (!active &&
823 (!last_activity_ws ||
824 ktime_to_ns(ws->last_time) >
825 ktime_to_ns(last_activity_ws->last_time))) {
826 last_activity_ws = ws;
830 if (!active && last_activity_ws)
831 pr_info("last active wakeup source: %s\n",
832 last_activity_ws->name);
833 srcu_read_unlock(&wakeup_srcu, srcuidx);
835 EXPORT_SYMBOL_GPL(pm_print_active_wakeup_sources);
838 * pm_wakeup_pending - Check if power transition in progress should be aborted.
840 * Compare the current number of registered wakeup events with its preserved
841 * value from the past and return true if new wakeup events have been registered
842 * since the old value was stored. Also return true if the current number of
843 * wakeup events being processed is different from zero.
845 bool pm_wakeup_pending(void)
847 unsigned long flags;
848 bool ret = false;
850 spin_lock_irqsave(&events_lock, flags);
851 if (events_check_enabled) {
852 unsigned int cnt, inpr;
854 split_counters(&cnt, &inpr);
855 ret = (cnt != saved_count || inpr > 0);
856 events_check_enabled = !ret;
858 spin_unlock_irqrestore(&events_lock, flags);
860 if (ret) {
861 pr_info("PM: Wakeup pending, aborting suspend\n");
862 pm_print_active_wakeup_sources();
865 return ret || pm_abort_suspend;
868 void pm_system_wakeup(void)
870 pm_abort_suspend = true;
871 freeze_wake();
873 EXPORT_SYMBOL_GPL(pm_system_wakeup);
875 void pm_wakeup_clear(void)
877 pm_abort_suspend = false;
878 pm_wakeup_irq = 0;
881 void pm_system_irq_wakeup(unsigned int irq_number)
883 if (pm_wakeup_irq == 0) {
884 pm_wakeup_irq = irq_number;
885 pm_system_wakeup();
890 * pm_get_wakeup_count - Read the number of registered wakeup events.
891 * @count: Address to store the value at.
892 * @block: Whether or not to block.
894 * Store the number of registered wakeup events at the address in @count. If
895 * @block is set, block until the current number of wakeup events being
896 * processed is zero.
898 * Return 'false' if the current number of wakeup events being processed is
899 * nonzero. Otherwise return 'true'.
901 bool pm_get_wakeup_count(unsigned int *count, bool block)
903 unsigned int cnt, inpr;
905 if (block) {
906 DEFINE_WAIT(wait);
908 for (;;) {
909 prepare_to_wait(&wakeup_count_wait_queue, &wait,
910 TASK_INTERRUPTIBLE);
911 split_counters(&cnt, &inpr);
912 if (inpr == 0 || signal_pending(current))
913 break;
915 schedule();
917 finish_wait(&wakeup_count_wait_queue, &wait);
920 split_counters(&cnt, &inpr);
921 *count = cnt;
922 return !inpr;
926 * pm_save_wakeup_count - Save the current number of registered wakeup events.
927 * @count: Value to compare with the current number of registered wakeup events.
929 * If @count is equal to the current number of registered wakeup events and the
930 * current number of wakeup events being processed is zero, store @count as the
931 * old number of registered wakeup events for pm_check_wakeup_events(), enable
932 * wakeup events detection and return 'true'. Otherwise disable wakeup events
933 * detection and return 'false'.
935 bool pm_save_wakeup_count(unsigned int count)
937 unsigned int cnt, inpr;
938 unsigned long flags;
940 events_check_enabled = false;
941 spin_lock_irqsave(&events_lock, flags);
942 split_counters(&cnt, &inpr);
943 if (cnt == count && inpr == 0) {
944 saved_count = count;
945 events_check_enabled = true;
947 spin_unlock_irqrestore(&events_lock, flags);
948 return events_check_enabled;
951 #ifdef CONFIG_PM_AUTOSLEEP
953 * pm_wakep_autosleep_enabled - Modify autosleep_enabled for all wakeup sources.
954 * @enabled: Whether to set or to clear the autosleep_enabled flags.
956 void pm_wakep_autosleep_enabled(bool set)
958 struct wakeup_source *ws;
959 ktime_t now = ktime_get();
960 int srcuidx;
962 srcuidx = srcu_read_lock(&wakeup_srcu);
963 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
964 spin_lock_irq(&ws->lock);
965 if (ws->autosleep_enabled != set) {
966 ws->autosleep_enabled = set;
967 if (ws->active) {
968 if (set)
969 ws->start_prevent_time = now;
970 else
971 update_prevent_sleep_time(ws, now);
974 spin_unlock_irq(&ws->lock);
976 srcu_read_unlock(&wakeup_srcu, srcuidx);
978 #endif /* CONFIG_PM_AUTOSLEEP */
980 static struct dentry *wakeup_sources_stats_dentry;
983 * print_wakeup_source_stats - Print wakeup source statistics information.
984 * @m: seq_file to print the statistics into.
985 * @ws: Wakeup source object to print the statistics for.
987 static int print_wakeup_source_stats(struct seq_file *m,
988 struct wakeup_source *ws)
990 unsigned long flags;
991 ktime_t total_time;
992 ktime_t max_time;
993 unsigned long active_count;
994 ktime_t active_time;
995 ktime_t prevent_sleep_time;
997 spin_lock_irqsave(&ws->lock, flags);
999 total_time = ws->total_time;
1000 max_time = ws->max_time;
1001 prevent_sleep_time = ws->prevent_sleep_time;
1002 active_count = ws->active_count;
1003 if (ws->active) {
1004 ktime_t now = ktime_get();
1006 active_time = ktime_sub(now, ws->last_time);
1007 total_time = ktime_add(total_time, active_time);
1008 if (active_time.tv64 > max_time.tv64)
1009 max_time = active_time;
1011 if (ws->autosleep_enabled)
1012 prevent_sleep_time = ktime_add(prevent_sleep_time,
1013 ktime_sub(now, ws->start_prevent_time));
1014 } else {
1015 active_time = ktime_set(0, 0);
1018 seq_printf(m, "%-12s\t%lu\t\t%lu\t\t%lu\t\t%lu\t\t%lld\t\t%lld\t\t%lld\t\t%lld\t\t%lld\n",
1019 ws->name, active_count, ws->event_count,
1020 ws->wakeup_count, ws->expire_count,
1021 ktime_to_ms(active_time), ktime_to_ms(total_time),
1022 ktime_to_ms(max_time), ktime_to_ms(ws->last_time),
1023 ktime_to_ms(prevent_sleep_time));
1025 spin_unlock_irqrestore(&ws->lock, flags);
1027 return 0;
1031 * wakeup_sources_stats_show - Print wakeup sources statistics information.
1032 * @m: seq_file to print the statistics into.
1034 static int wakeup_sources_stats_show(struct seq_file *m, void *unused)
1036 struct wakeup_source *ws;
1037 int srcuidx;
1039 seq_puts(m, "name\t\tactive_count\tevent_count\twakeup_count\t"
1040 "expire_count\tactive_since\ttotal_time\tmax_time\t"
1041 "last_change\tprevent_suspend_time\n");
1043 srcuidx = srcu_read_lock(&wakeup_srcu);
1044 list_for_each_entry_rcu(ws, &wakeup_sources, entry)
1045 print_wakeup_source_stats(m, ws);
1046 srcu_read_unlock(&wakeup_srcu, srcuidx);
1048 print_wakeup_source_stats(m, &deleted_ws);
1050 return 0;
1053 static int wakeup_sources_stats_open(struct inode *inode, struct file *file)
1055 return single_open(file, wakeup_sources_stats_show, NULL);
1058 static const struct file_operations wakeup_sources_stats_fops = {
1059 .owner = THIS_MODULE,
1060 .open = wakeup_sources_stats_open,
1061 .read = seq_read,
1062 .llseek = seq_lseek,
1063 .release = single_release,
1066 static int __init wakeup_sources_debugfs_init(void)
1068 wakeup_sources_stats_dentry = debugfs_create_file("wakeup_sources",
1069 S_IRUGO, NULL, NULL, &wakeup_sources_stats_fops);
1070 return 0;
1073 postcore_initcall(wakeup_sources_debugfs_init);