6  * but triggers a RTC alarm if the box is suspend.
8  * This interface is influenced by the Android RTC Alarm timer
37  * struct alarm_base - Alarm timer bases
61 /* rtc timer and device for setting alarm wakeups at suspend */
151  * alarmtimer_enqueue - Adds an alarm timer to an alarm_base timerqueue
153  * @alarm: pointer to alarm being enqueued.
155  * Adds alarm to a alarm_base timerqueue
159 static void alarmtimer_enqueue(struct alarm_base *base, struct alarm *alarm)  in alarmtimer_enqueue()  argument
161 	if (alarm->state & ALARMTIMER_STATE_ENQUEUED)  in alarmtimer_enqueue()
162 		timerqueue_del(&base->timerqueue, &alarm->node);  in alarmtimer_enqueue()
164 	timerqueue_add(&base->timerqueue, &alarm->node);  in alarmtimer_enqueue()
165 	alarm->state |= ALARMTIMER_STATE_ENQUEUED;  in alarmtimer_enqueue()
169  * alarmtimer_dequeue - Removes an alarm timer from an alarm_base timerqueue
171  * @alarm: pointer to alarm being removed
173  * Removes alarm to a alarm_base timerqueue
177 static void alarmtimer_dequeue(struct alarm_base *base, struct alarm *alarm)  in alarmtimer_dequeue()  argument
179 	if (!(alarm->state & ALARMTIMER_STATE_ENQUEUED))  in alarmtimer_dequeue()
182 	timerqueue_del(&base->timerqueue, &alarm->node);  in alarmtimer_dequeue()
183 	alarm->state &= ~ALARMTIMER_STATE_ENQUEUED;  in alarmtimer_dequeue()
188  * alarmtimer_fired - Handles alarm hrtimer being fired.
191  * When a alarm timer fires, this runs through the timerqueue to
192  * see which alarms expired, and runs those. If there are more alarm
194  * the next future alarm timer expires.
198 	struct alarm *alarm = container_of(timer, struct alarm, timer);  in alarmtimer_fired()  local
199 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarmtimer_fired()
202 		alarmtimer_dequeue(base, alarm);  in alarmtimer_fired()
204 	if (alarm->function)  in alarmtimer_fired()
205 		alarm->function(alarm, base->get_ktime());  in alarmtimer_fired()
207 	trace_alarmtimer_fired(alarm, base->get_ktime());  in alarmtimer_fired()
211 ktime_t alarm_expires_remaining(const struct alarm *alarm)  in alarm_expires_remaining()  argument
213 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_expires_remaining()
214 	return ktime_sub(alarm->node.expires, base->get_ktime());  in alarm_expires_remaining()
282 	 * If the RTC alarm timer only supports a limited time offset, set the  in alarmtimer_suspend()
283 	 * alarm time to the maximum supported value.  in alarmtimer_suspend()
293 	/* Set alarm, if in the past reject suspend briefly to handle */  in alarmtimer_suspend()
323 __alarm_init(struct alarm *alarm, enum alarmtimer_type type,  in __alarm_init()  argument
324 	     void (*function)(struct alarm *, ktime_t))  in __alarm_init()  argument
326 	timerqueue_init(&alarm->node);  in __alarm_init()
327 	alarm->function = function;  in __alarm_init()
328 	alarm->type = type;  in __alarm_init()
329 	alarm->state = ALARMTIMER_STATE_INACTIVE;  in __alarm_init()
333  * alarm_init - Initialize an alarm structure
334  * @alarm: ptr to alarm to be initialized
335  * @type: the type of the alarm
336  * @function: callback that is run when the alarm fires
338 void alarm_init(struct alarm *alarm, enum alarmtimer_type type,  in alarm_init()  argument
339 		void (*function)(struct alarm *, ktime_t))  in alarm_init()  argument
341 	hrtimer_setup(&alarm->timer, alarmtimer_fired, alarm_bases[type].base_clockid,  in alarm_init()
343 	__alarm_init(alarm, type, function);  in alarm_init()
348  * alarm_start - Sets an absolute alarm to fire
349  * @alarm: ptr to alarm to set
350  * @start: time to run the alarm
352 void alarm_start(struct alarm *alarm, ktime_t start)  in alarm_start()  argument
354 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_start()
358 	alarm->node.expires = start;  in alarm_start()
359 	alarmtimer_enqueue(base, alarm);  in alarm_start()
360 	hrtimer_start(&alarm->timer, alarm->node.expires, HRTIMER_MODE_ABS);  in alarm_start()
363 	trace_alarmtimer_start(alarm, base->get_ktime());  in alarm_start()
368  * alarm_start_relative - Sets a relative alarm to fire
369  * @alarm: ptr to alarm to set
370  * @start: time relative to now to run the alarm
372 void alarm_start_relative(struct alarm *alarm, ktime_t start)  in alarm_start_relative()  argument
374 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_start_relative()
377 	alarm_start(alarm, start);  in alarm_start_relative()
381 void alarm_restart(struct alarm *alarm)  in alarm_restart()  argument
383 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_restart()
387 	hrtimer_set_expires(&alarm->timer, alarm->node.expires);  in alarm_restart()
388 	hrtimer_restart(&alarm->timer);  in alarm_restart()
389 	alarmtimer_enqueue(base, alarm);  in alarm_restart()
395  * alarm_try_to_cancel - Tries to cancel an alarm timer
396  * @alarm: ptr to alarm to be canceled
401 int alarm_try_to_cancel(struct alarm *alarm)  in alarm_try_to_cancel()  argument
403 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_try_to_cancel()
408 	ret = hrtimer_try_to_cancel(&alarm->timer);  in alarm_try_to_cancel()
410 		alarmtimer_dequeue(base, alarm);  in alarm_try_to_cancel()
413 	trace_alarmtimer_cancel(alarm, base->get_ktime());  in alarm_try_to_cancel()
420  * alarm_cancel - Spins trying to cancel an alarm timer until it is done
421  * @alarm: ptr to alarm to be canceled
425 int alarm_cancel(struct alarm *alarm)  in alarm_cancel()  argument
428 		int ret = alarm_try_to_cancel(alarm);  in alarm_cancel()
431 		hrtimer_cancel_wait_running(&alarm->timer);  in alarm_cancel()
437 u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval)  in alarm_forward()  argument
442 	delta = ktime_sub(now, alarm->node.expires);  in alarm_forward()
452 		alarm->node.expires = ktime_add_ns(alarm->node.expires,  in alarm_forward()
455 		if (alarm->node.expires > now)  in alarm_forward()
464 	alarm->node.expires = ktime_add_safe(alarm->node.expires, interval);  in alarm_forward()
469 u64 alarm_forward_now(struct alarm *alarm, ktime_t interval)  in alarm_forward_now()  argument
471 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_forward_now()
473 	return alarm_forward(alarm, base->get_ktime(), interval);  in alarm_forward_now()
495 		WARN_ONCE(1, "Invalid alarm type: %d\n", type);  in alarmtimer_freezerset()
525  * @alarm: alarm that fired
528  * Posix timer callback for expired alarm timers.
532 static void alarm_handle_timer(struct alarm *alarm, ktime_t now)  in alarm_handle_timer()  argument
534 	struct k_itimer *ptr = container_of(alarm, struct k_itimer, it.alarm.alarmtimer);  in alarm_handle_timer()
546 	struct alarm *alarm = &timr->it.alarm.alarmtimer;  in alarm_timer_rearm()  local
548 	timr->it_overrun += alarm_forward_now(alarm, timr->it_interval);  in alarm_timer_rearm()
549 	alarm_start(alarm, alarm->node.expires);  in alarm_timer_rearm()
559 	struct alarm *alarm = &timr->it.alarm.alarmtimer;  in alarm_timer_forward()  local
561 	return alarm_forward(alarm, timr->it_interval, now);  in alarm_timer_forward()
571 	struct alarm *alarm = &timr->it.alarm.alarmtimer;  in alarm_timer_remaining()  local
573 	return ktime_sub(alarm->node.expires, now);  in alarm_timer_remaining()
582 	return alarm_try_to_cancel(&timr->it.alarm.alarmtimer);  in alarm_timer_try_to_cancel()
595 	hrtimer_cancel_wait_running(&timr->it.alarm.alarmtimer.timer);  in alarm_timer_wait_running()
608 	struct alarm *alarm = &timr->it.alarm.alarmtimer;  in alarm_timer_arm()  local
609 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_timer_arm()
614 		alarm->node.expires = expires;  in alarm_timer_arm()
616 		alarm_start(&timr->it.alarm.alarmtimer, expires);  in alarm_timer_arm()
624  * Returns the granularity of underlying alarm base clock
641  * Provides the underlying alarm base time in a tasks time namespace.
659  * Provides the underlying alarm base time in the root namespace.
688 	alarm_init(&new_timer->it.alarm.alarmtimer, type, alarm_handle_timer);  in alarm_timer_create()
694  * @alarm: ptr to alarm that fired
699 static void alarmtimer_nsleep_wakeup(struct alarm *alarm, ktime_t now)  in alarmtimer_nsleep_wakeup()  argument
701 	struct task_struct *task = alarm->data;  in alarmtimer_nsleep_wakeup()
703 	alarm->data = NULL;  in alarmtimer_nsleep_wakeup()
710  * @alarm: ptr to alarmtimer
712  * @type: alarm type (BOOTTIME/REALTIME).
714  * Sets the alarm timer and sleeps until it is fired or interrupted.
716 static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp,  in alarmtimer_do_nsleep()  argument
720 	alarm->data = (void *)current;  in alarmtimer_do_nsleep()
723 		alarm_start(alarm, absexp);  in alarmtimer_do_nsleep()
724 		if (likely(alarm->data))  in alarmtimer_do_nsleep()
727 		alarm_cancel(alarm);  in alarmtimer_do_nsleep()
728 	} while (alarm->data && !signal_pending(current));  in alarmtimer_do_nsleep()
732 	destroy_hrtimer_on_stack(&alarm->timer);  in alarmtimer_do_nsleep()
734 	if (!alarm->data)  in alarmtimer_do_nsleep()
756 alarm_init_on_stack(struct alarm *alarm, enum alarmtimer_type type,  in alarm_init_on_stack()  argument
757 		    void (*function)(struct alarm *, ktime_t))  in alarm_init_on_stack()  argument
759 	hrtimer_setup_on_stack(&alarm->timer, alarmtimer_fired, alarm_bases[type].base_clockid,  in alarm_init_on_stack()
761 	__alarm_init(alarm, type, function);  in alarm_init_on_stack()
774 	struct alarm alarm;  in alarm_timer_nsleep_restart()  local
776 	alarm_init_on_stack(&alarm, type, alarmtimer_nsleep_wakeup);  in alarm_timer_nsleep_restart()
778 	return alarmtimer_do_nsleep(&alarm, exp, type);  in alarm_timer_nsleep_restart()
794 	struct alarm alarm;  in alarm_timer_nsleep()  local
807 	alarm_init_on_stack(&alarm, type, alarmtimer_nsleep_wakeup);  in alarm_timer_nsleep()
819 	ret = alarmtimer_do_nsleep(&alarm, exp, type);  in alarm_timer_nsleep()
872  * alarmtimer_init - Initialize alarm timer code
874  * This function initializes the alarm bases and registers
884 	/* Initialize alarm bases */  in alarmtimer_init()