4 * This interface provides a timer which is similarto hrtimers,
5 * but triggers a RTC alarm if the box is suspend.
7 * This interface is influenced by the Android RTC Alarm timer
10 * Copyright (C) 2010 IBM Corperation
12 * Author: John Stultz <john.stultz@linaro.org>
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
18 #include <linux/time.h>
19 #include <linux/hrtimer.h>
20 #include <linux/timerqueue.h>
21 #include <linux/rtc.h>
22 #include <linux/sched/signal.h>
23 #include <linux/sched/debug.h>
24 #include <linux/alarmtimer.h>
25 #include <linux/mutex.h>
26 #include <linux/platform_device.h>
27 #include <linux/posix-timers.h>
28 #include <linux/workqueue.h>
29 #include <linux/freezer.h>
30 #include <linux/compat.h>
31 #include <linux/module.h>
33 #include "posix-timers.h"
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/alarmtimer.h>
39 * struct alarm_base - Alarm timer bases
40 * @lock: Lock for syncrhonized access to the base
41 * @timerqueue: Timerqueue head managing the list of events
42 * @gettime: Function to read the time correlating to the base
43 * @base_clockid: clockid for the base
45 static struct alarm_base
{
47 struct timerqueue_head timerqueue
;
48 ktime_t (*gettime
)(void);
49 clockid_t base_clockid
;
50 } alarm_bases
[ALARM_NUMTYPE
];
52 #if defined(CONFIG_POSIX_TIMERS) || defined(CONFIG_RTC_CLASS)
53 /* freezer information to handle clock_nanosleep triggered wakeups */
54 static enum alarmtimer_type freezer_alarmtype
;
55 static ktime_t freezer_expires
;
56 static ktime_t freezer_delta
;
57 static DEFINE_SPINLOCK(freezer_delta_lock
);
60 #ifdef CONFIG_RTC_CLASS
61 static struct wakeup_source
*ws
;
63 /* rtc timer and device for setting alarm wakeups at suspend */
64 static struct rtc_timer rtctimer
;
65 static struct rtc_device
*rtcdev
;
66 static DEFINE_SPINLOCK(rtcdev_lock
);
69 * alarmtimer_get_rtcdev - Return selected rtcdevice
71 * This function returns the rtc device to use for wakealarms.
72 * If one has not already been chosen, it checks to see if a
73 * functional rtc device is available.
75 struct rtc_device
*alarmtimer_get_rtcdev(void)
78 struct rtc_device
*ret
;
80 spin_lock_irqsave(&rtcdev_lock
, flags
);
82 spin_unlock_irqrestore(&rtcdev_lock
, flags
);
86 EXPORT_SYMBOL_GPL(alarmtimer_get_rtcdev
);
88 static int alarmtimer_rtc_add_device(struct device
*dev
,
89 struct class_interface
*class_intf
)
92 struct rtc_device
*rtc
= to_rtc_device(dev
);
93 struct wakeup_source
*__ws
;
99 if (!rtc
->ops
->set_alarm
)
101 if (!device_may_wakeup(rtc
->dev
.parent
))
104 __ws
= wakeup_source_register("alarmtimer");
106 spin_lock_irqsave(&rtcdev_lock
, flags
);
108 if (!try_module_get(rtc
->owner
)) {
114 /* hold a reference so it doesn't go away */
120 spin_unlock_irqrestore(&rtcdev_lock
, flags
);
122 wakeup_source_unregister(__ws
);
127 static inline void alarmtimer_rtc_timer_init(void)
129 rtc_timer_init(&rtctimer
, NULL
, NULL
);
132 static struct class_interface alarmtimer_rtc_interface
= {
133 .add_dev
= &alarmtimer_rtc_add_device
,
136 static int alarmtimer_rtc_interface_setup(void)
138 alarmtimer_rtc_interface
.class = rtc_class
;
139 return class_interface_register(&alarmtimer_rtc_interface
);
141 static void alarmtimer_rtc_interface_remove(void)
143 class_interface_unregister(&alarmtimer_rtc_interface
);
146 struct rtc_device
*alarmtimer_get_rtcdev(void)
150 #define rtcdev (NULL)
151 static inline int alarmtimer_rtc_interface_setup(void) { return 0; }
152 static inline void alarmtimer_rtc_interface_remove(void) { }
153 static inline void alarmtimer_rtc_timer_init(void) { }
157 * alarmtimer_enqueue - Adds an alarm timer to an alarm_base timerqueue
158 * @base: pointer to the base where the timer is being run
159 * @alarm: pointer to alarm being enqueued.
161 * Adds alarm to a alarm_base timerqueue
163 * Must hold base->lock when calling.
165 static void alarmtimer_enqueue(struct alarm_base
*base
, struct alarm
*alarm
)
167 if (alarm
->state
& ALARMTIMER_STATE_ENQUEUED
)
168 timerqueue_del(&base
->timerqueue
, &alarm
->node
);
170 timerqueue_add(&base
->timerqueue
, &alarm
->node
);
171 alarm
->state
|= ALARMTIMER_STATE_ENQUEUED
;
175 * alarmtimer_dequeue - Removes an alarm timer from an alarm_base timerqueue
176 * @base: pointer to the base where the timer is running
177 * @alarm: pointer to alarm being removed
179 * Removes alarm to a alarm_base timerqueue
181 * Must hold base->lock when calling.
183 static void alarmtimer_dequeue(struct alarm_base
*base
, struct alarm
*alarm
)
185 if (!(alarm
->state
& ALARMTIMER_STATE_ENQUEUED
))
188 timerqueue_del(&base
->timerqueue
, &alarm
->node
);
189 alarm
->state
&= ~ALARMTIMER_STATE_ENQUEUED
;
194 * alarmtimer_fired - Handles alarm hrtimer being fired.
195 * @timer: pointer to hrtimer being run
197 * When a alarm timer fires, this runs through the timerqueue to
198 * see which alarms expired, and runs those. If there are more alarm
199 * timers queued for the future, we set the hrtimer to fire when
200 * when the next future alarm timer expires.
202 static enum hrtimer_restart
alarmtimer_fired(struct hrtimer
*timer
)
204 struct alarm
*alarm
= container_of(timer
, struct alarm
, timer
);
205 struct alarm_base
*base
= &alarm_bases
[alarm
->type
];
207 int ret
= HRTIMER_NORESTART
;
208 int restart
= ALARMTIMER_NORESTART
;
210 spin_lock_irqsave(&base
->lock
, flags
);
211 alarmtimer_dequeue(base
, alarm
);
212 spin_unlock_irqrestore(&base
->lock
, flags
);
215 restart
= alarm
->function(alarm
, base
->gettime());
217 spin_lock_irqsave(&base
->lock
, flags
);
218 if (restart
!= ALARMTIMER_NORESTART
) {
219 hrtimer_set_expires(&alarm
->timer
, alarm
->node
.expires
);
220 alarmtimer_enqueue(base
, alarm
);
221 ret
= HRTIMER_RESTART
;
223 spin_unlock_irqrestore(&base
->lock
, flags
);
225 trace_alarmtimer_fired(alarm
, base
->gettime());
230 ktime_t
alarm_expires_remaining(const struct alarm
*alarm
)
232 struct alarm_base
*base
= &alarm_bases
[alarm
->type
];
233 return ktime_sub(alarm
->node
.expires
, base
->gettime());
235 EXPORT_SYMBOL_GPL(alarm_expires_remaining
);
237 #ifdef CONFIG_RTC_CLASS
239 * alarmtimer_suspend - Suspend time callback
243 * When we are going into suspend, we look through the bases
244 * to see which is the soonest timer to expire. We then
245 * set an rtc timer to fire that far into the future, which
246 * will wake us from suspend.
248 static int alarmtimer_suspend(struct device
*dev
)
250 ktime_t min
, now
, expires
;
252 struct rtc_device
*rtc
;
256 spin_lock_irqsave(&freezer_delta_lock
, flags
);
258 expires
= freezer_expires
;
259 type
= freezer_alarmtype
;
261 spin_unlock_irqrestore(&freezer_delta_lock
, flags
);
263 rtc
= alarmtimer_get_rtcdev();
264 /* If we have no rtcdev, just return */
268 /* Find the soonest timer to expire*/
269 for (i
= 0; i
< ALARM_NUMTYPE
; i
++) {
270 struct alarm_base
*base
= &alarm_bases
[i
];
271 struct timerqueue_node
*next
;
274 spin_lock_irqsave(&base
->lock
, flags
);
275 next
= timerqueue_getnext(&base
->timerqueue
);
276 spin_unlock_irqrestore(&base
->lock
, flags
);
279 delta
= ktime_sub(next
->expires
, base
->gettime());
280 if (!min
|| (delta
< min
)) {
281 expires
= next
->expires
;
289 if (ktime_to_ns(min
) < 2 * NSEC_PER_SEC
) {
290 __pm_wakeup_event(ws
, 2 * MSEC_PER_SEC
);
294 trace_alarmtimer_suspend(expires
, type
);
296 /* Setup an rtc timer to fire that far in the future */
297 rtc_timer_cancel(rtc
, &rtctimer
);
298 rtc_read_time(rtc
, &tm
);
299 now
= rtc_tm_to_ktime(tm
);
300 now
= ktime_add(now
, min
);
302 /* Set alarm, if in the past reject suspend briefly to handle */
303 ret
= rtc_timer_start(rtc
, &rtctimer
, now
, 0);
305 __pm_wakeup_event(ws
, MSEC_PER_SEC
);
309 static int alarmtimer_resume(struct device
*dev
)
311 struct rtc_device
*rtc
;
313 rtc
= alarmtimer_get_rtcdev();
315 rtc_timer_cancel(rtc
, &rtctimer
);
320 static int alarmtimer_suspend(struct device
*dev
)
325 static int alarmtimer_resume(struct device
*dev
)
332 __alarm_init(struct alarm
*alarm
, enum alarmtimer_type type
,
333 enum alarmtimer_restart (*function
)(struct alarm
*, ktime_t
))
335 timerqueue_init(&alarm
->node
);
336 alarm
->timer
.function
= alarmtimer_fired
;
337 alarm
->function
= function
;
339 alarm
->state
= ALARMTIMER_STATE_INACTIVE
;
343 * alarm_init - Initialize an alarm structure
344 * @alarm: ptr to alarm to be initialized
345 * @type: the type of the alarm
346 * @function: callback that is run when the alarm fires
348 void alarm_init(struct alarm
*alarm
, enum alarmtimer_type type
,
349 enum alarmtimer_restart (*function
)(struct alarm
*, ktime_t
))
351 hrtimer_init(&alarm
->timer
, alarm_bases
[type
].base_clockid
,
353 __alarm_init(alarm
, type
, function
);
355 EXPORT_SYMBOL_GPL(alarm_init
);
358 * alarm_start - Sets an absolute alarm to fire
359 * @alarm: ptr to alarm to set
360 * @start: time to run the alarm
362 void alarm_start(struct alarm
*alarm
, ktime_t start
)
364 struct alarm_base
*base
= &alarm_bases
[alarm
->type
];
367 spin_lock_irqsave(&base
->lock
, flags
);
368 alarm
->node
.expires
= start
;
369 alarmtimer_enqueue(base
, alarm
);
370 hrtimer_start(&alarm
->timer
, alarm
->node
.expires
, HRTIMER_MODE_ABS
);
371 spin_unlock_irqrestore(&base
->lock
, flags
);
373 trace_alarmtimer_start(alarm
, base
->gettime());
375 EXPORT_SYMBOL_GPL(alarm_start
);
378 * alarm_start_relative - Sets a relative alarm to fire
379 * @alarm: ptr to alarm to set
380 * @start: time relative to now to run the alarm
382 void alarm_start_relative(struct alarm
*alarm
, ktime_t start
)
384 struct alarm_base
*base
= &alarm_bases
[alarm
->type
];
386 start
= ktime_add_safe(start
, base
->gettime());
387 alarm_start(alarm
, start
);
389 EXPORT_SYMBOL_GPL(alarm_start_relative
);
391 void alarm_restart(struct alarm
*alarm
)
393 struct alarm_base
*base
= &alarm_bases
[alarm
->type
];
396 spin_lock_irqsave(&base
->lock
, flags
);
397 hrtimer_set_expires(&alarm
->timer
, alarm
->node
.expires
);
398 hrtimer_restart(&alarm
->timer
);
399 alarmtimer_enqueue(base
, alarm
);
400 spin_unlock_irqrestore(&base
->lock
, flags
);
402 EXPORT_SYMBOL_GPL(alarm_restart
);
405 * alarm_try_to_cancel - Tries to cancel an alarm timer
406 * @alarm: ptr to alarm to be canceled
408 * Returns 1 if the timer was canceled, 0 if it was not running,
409 * and -1 if the callback was running
411 int alarm_try_to_cancel(struct alarm
*alarm
)
413 struct alarm_base
*base
= &alarm_bases
[alarm
->type
];
417 spin_lock_irqsave(&base
->lock
, flags
);
418 ret
= hrtimer_try_to_cancel(&alarm
->timer
);
420 alarmtimer_dequeue(base
, alarm
);
421 spin_unlock_irqrestore(&base
->lock
, flags
);
423 trace_alarmtimer_cancel(alarm
, base
->gettime());
426 EXPORT_SYMBOL_GPL(alarm_try_to_cancel
);
430 * alarm_cancel - Spins trying to cancel an alarm timer until it is done
431 * @alarm: ptr to alarm to be canceled
433 * Returns 1 if the timer was canceled, 0 if it was not active.
435 int alarm_cancel(struct alarm
*alarm
)
438 int ret
= alarm_try_to_cancel(alarm
);
444 EXPORT_SYMBOL_GPL(alarm_cancel
);
447 u64
alarm_forward(struct alarm
*alarm
, ktime_t now
, ktime_t interval
)
452 delta
= ktime_sub(now
, alarm
->node
.expires
);
457 if (unlikely(delta
>= interval
)) {
458 s64 incr
= ktime_to_ns(interval
);
460 overrun
= ktime_divns(delta
, incr
);
462 alarm
->node
.expires
= ktime_add_ns(alarm
->node
.expires
,
465 if (alarm
->node
.expires
> now
)
468 * This (and the ktime_add() below) is the
469 * correction for exact:
474 alarm
->node
.expires
= ktime_add_safe(alarm
->node
.expires
, interval
);
477 EXPORT_SYMBOL_GPL(alarm_forward
);
479 u64
alarm_forward_now(struct alarm
*alarm
, ktime_t interval
)
481 struct alarm_base
*base
= &alarm_bases
[alarm
->type
];
483 return alarm_forward(alarm
, base
->gettime(), interval
);
485 EXPORT_SYMBOL_GPL(alarm_forward_now
);
487 #ifdef CONFIG_POSIX_TIMERS
489 static void alarmtimer_freezerset(ktime_t absexp
, enum alarmtimer_type type
)
491 struct alarm_base
*base
;
497 base
= &alarm_bases
[ALARM_REALTIME
];
498 type
= ALARM_REALTIME_FREEZER
;
501 base
= &alarm_bases
[ALARM_BOOTTIME
];
502 type
= ALARM_BOOTTIME_FREEZER
;
505 WARN_ONCE(1, "Invalid alarm type: %d\n", type
);
509 delta
= ktime_sub(absexp
, base
->gettime());
511 spin_lock_irqsave(&freezer_delta_lock
, flags
);
512 if (!freezer_delta
|| (delta
< freezer_delta
)) {
513 freezer_delta
= delta
;
514 freezer_expires
= absexp
;
515 freezer_alarmtype
= type
;
517 spin_unlock_irqrestore(&freezer_delta_lock
, flags
);
521 * clock2alarm - helper that converts from clockid to alarmtypes
524 static enum alarmtimer_type
clock2alarm(clockid_t clockid
)
526 if (clockid
== CLOCK_REALTIME_ALARM
)
527 return ALARM_REALTIME
;
528 if (clockid
== CLOCK_BOOTTIME_ALARM
)
529 return ALARM_BOOTTIME
;
534 * alarm_handle_timer - Callback for posix timers
535 * @alarm: alarm that fired
537 * Posix timer callback for expired alarm timers.
539 static enum alarmtimer_restart
alarm_handle_timer(struct alarm
*alarm
,
542 struct k_itimer
*ptr
= container_of(alarm
, struct k_itimer
,
543 it
.alarm
.alarmtimer
);
544 enum alarmtimer_restart result
= ALARMTIMER_NORESTART
;
548 spin_lock_irqsave(&ptr
->it_lock
, flags
);
551 if (ptr
->it_interval
)
552 si_private
= ++ptr
->it_requeue_pending
;
554 if (posix_timer_event(ptr
, si_private
) && ptr
->it_interval
) {
556 * Handle ignored signals and rearm the timer. This will go
557 * away once we handle ignored signals proper.
559 ptr
->it_overrun
+= alarm_forward_now(alarm
, ptr
->it_interval
);
560 ++ptr
->it_requeue_pending
;
562 result
= ALARMTIMER_RESTART
;
564 spin_unlock_irqrestore(&ptr
->it_lock
, flags
);
570 * alarm_timer_rearm - Posix timer callback for rearming timer
571 * @timr: Pointer to the posixtimer data struct
573 static void alarm_timer_rearm(struct k_itimer
*timr
)
575 struct alarm
*alarm
= &timr
->it
.alarm
.alarmtimer
;
577 timr
->it_overrun
+= alarm_forward_now(alarm
, timr
->it_interval
);
578 alarm_start(alarm
, alarm
->node
.expires
);
582 * alarm_timer_forward - Posix timer callback for forwarding timer
583 * @timr: Pointer to the posixtimer data struct
584 * @now: Current time to forward the timer against
586 static s64
alarm_timer_forward(struct k_itimer
*timr
, ktime_t now
)
588 struct alarm
*alarm
= &timr
->it
.alarm
.alarmtimer
;
590 return alarm_forward(alarm
, timr
->it_interval
, now
);
594 * alarm_timer_remaining - Posix timer callback to retrieve remaining time
595 * @timr: Pointer to the posixtimer data struct
596 * @now: Current time to calculate against
598 static ktime_t
alarm_timer_remaining(struct k_itimer
*timr
, ktime_t now
)
600 struct alarm
*alarm
= &timr
->it
.alarm
.alarmtimer
;
602 return ktime_sub(alarm
->node
.expires
, now
);
606 * alarm_timer_try_to_cancel - Posix timer callback to cancel a timer
607 * @timr: Pointer to the posixtimer data struct
609 static int alarm_timer_try_to_cancel(struct k_itimer
*timr
)
611 return alarm_try_to_cancel(&timr
->it
.alarm
.alarmtimer
);
615 * alarm_timer_arm - Posix timer callback to arm a timer
616 * @timr: Pointer to the posixtimer data struct
617 * @expires: The new expiry time
618 * @absolute: Expiry value is absolute time
619 * @sigev_none: Posix timer does not deliver signals
621 static void alarm_timer_arm(struct k_itimer
*timr
, ktime_t expires
,
622 bool absolute
, bool sigev_none
)
624 struct alarm
*alarm
= &timr
->it
.alarm
.alarmtimer
;
625 struct alarm_base
*base
= &alarm_bases
[alarm
->type
];
628 expires
= ktime_add_safe(expires
, base
->gettime());
630 alarm
->node
.expires
= expires
;
632 alarm_start(&timr
->it
.alarm
.alarmtimer
, expires
);
636 * alarm_clock_getres - posix getres interface
637 * @which_clock: clockid
638 * @tp: timespec to fill
640 * Returns the granularity of underlying alarm base clock
642 static int alarm_clock_getres(const clockid_t which_clock
, struct timespec64
*tp
)
644 if (!alarmtimer_get_rtcdev())
648 tp
->tv_nsec
= hrtimer_resolution
;
653 * alarm_clock_get - posix clock_get interface
654 * @which_clock: clockid
655 * @tp: timespec to fill.
657 * Provides the underlying alarm base time.
659 static int alarm_clock_get(clockid_t which_clock
, struct timespec64
*tp
)
661 struct alarm_base
*base
= &alarm_bases
[clock2alarm(which_clock
)];
663 if (!alarmtimer_get_rtcdev())
666 *tp
= ktime_to_timespec64(base
->gettime());
671 * alarm_timer_create - posix timer_create interface
672 * @new_timer: k_itimer pointer to manage
674 * Initializes the k_itimer structure.
676 static int alarm_timer_create(struct k_itimer
*new_timer
)
678 enum alarmtimer_type type
;
680 if (!alarmtimer_get_rtcdev())
683 if (!capable(CAP_WAKE_ALARM
))
686 type
= clock2alarm(new_timer
->it_clock
);
687 alarm_init(&new_timer
->it
.alarm
.alarmtimer
, type
, alarm_handle_timer
);
692 * alarmtimer_nsleep_wakeup - Wakeup function for alarm_timer_nsleep
693 * @alarm: ptr to alarm that fired
695 * Wakes up the task that set the alarmtimer
697 static enum alarmtimer_restart
alarmtimer_nsleep_wakeup(struct alarm
*alarm
,
700 struct task_struct
*task
= (struct task_struct
*)alarm
->data
;
704 wake_up_process(task
);
705 return ALARMTIMER_NORESTART
;
709 * alarmtimer_do_nsleep - Internal alarmtimer nsleep implementation
710 * @alarm: ptr to alarmtimer
711 * @absexp: absolute expiration time
713 * Sets the alarm timer and sleeps until it is fired or interrupted.
715 static int alarmtimer_do_nsleep(struct alarm
*alarm
, ktime_t absexp
,
716 enum alarmtimer_type type
)
718 struct restart_block
*restart
;
719 alarm
->data
= (void *)current
;
721 set_current_state(TASK_INTERRUPTIBLE
);
722 alarm_start(alarm
, absexp
);
723 if (likely(alarm
->data
))
727 } while (alarm
->data
&& !signal_pending(current
));
729 __set_current_state(TASK_RUNNING
);
731 destroy_hrtimer_on_stack(&alarm
->timer
);
736 if (freezing(current
))
737 alarmtimer_freezerset(absexp
, type
);
738 restart
= ¤t
->restart_block
;
739 if (restart
->nanosleep
.type
!= TT_NONE
) {
740 struct timespec64 rmt
;
743 rem
= ktime_sub(absexp
, alarm_bases
[type
].gettime());
747 rmt
= ktime_to_timespec64(rem
);
749 return nanosleep_copyout(restart
, &rmt
);
751 return -ERESTART_RESTARTBLOCK
;
755 alarm_init_on_stack(struct alarm
*alarm
, enum alarmtimer_type type
,
756 enum alarmtimer_restart (*function
)(struct alarm
*, ktime_t
))
758 hrtimer_init_on_stack(&alarm
->timer
, alarm_bases
[type
].base_clockid
,
760 __alarm_init(alarm
, type
, function
);
764 * alarm_timer_nsleep_restart - restartblock alarmtimer nsleep
765 * @restart: ptr to restart block
767 * Handles restarted clock_nanosleep calls
769 static long __sched
alarm_timer_nsleep_restart(struct restart_block
*restart
)
771 enum alarmtimer_type type
= restart
->nanosleep
.clockid
;
772 ktime_t exp
= restart
->nanosleep
.expires
;
775 alarm_init_on_stack(&alarm
, type
, alarmtimer_nsleep_wakeup
);
777 return alarmtimer_do_nsleep(&alarm
, exp
, type
);
781 * alarm_timer_nsleep - alarmtimer nanosleep
782 * @which_clock: clockid
783 * @flags: determins abstime or relative
784 * @tsreq: requested sleep time (abs or rel)
785 * @rmtp: remaining sleep time saved
787 * Handles clock_nanosleep calls against _ALARM clockids
789 static int alarm_timer_nsleep(const clockid_t which_clock
, int flags
,
790 const struct timespec64
*tsreq
)
792 enum alarmtimer_type type
= clock2alarm(which_clock
);
793 struct restart_block
*restart
= ¤t
->restart_block
;
798 if (!alarmtimer_get_rtcdev())
801 if (flags
& ~TIMER_ABSTIME
)
804 if (!capable(CAP_WAKE_ALARM
))
807 alarm_init_on_stack(&alarm
, type
, alarmtimer_nsleep_wakeup
);
809 exp
= timespec64_to_ktime(*tsreq
);
810 /* Convert (if necessary) to absolute time */
811 if (flags
!= TIMER_ABSTIME
) {
812 ktime_t now
= alarm_bases
[type
].gettime();
814 exp
= ktime_add_safe(now
, exp
);
817 ret
= alarmtimer_do_nsleep(&alarm
, exp
, type
);
818 if (ret
!= -ERESTART_RESTARTBLOCK
)
821 /* abs timers don't set remaining time or restart */
822 if (flags
== TIMER_ABSTIME
)
823 return -ERESTARTNOHAND
;
825 restart
->fn
= alarm_timer_nsleep_restart
;
826 restart
->nanosleep
.clockid
= type
;
827 restart
->nanosleep
.expires
= exp
;
831 const struct k_clock alarm_clock
= {
832 .clock_getres
= alarm_clock_getres
,
833 .clock_get
= alarm_clock_get
,
834 .timer_create
= alarm_timer_create
,
835 .timer_set
= common_timer_set
,
836 .timer_del
= common_timer_del
,
837 .timer_get
= common_timer_get
,
838 .timer_arm
= alarm_timer_arm
,
839 .timer_rearm
= alarm_timer_rearm
,
840 .timer_forward
= alarm_timer_forward
,
841 .timer_remaining
= alarm_timer_remaining
,
842 .timer_try_to_cancel
= alarm_timer_try_to_cancel
,
843 .nsleep
= alarm_timer_nsleep
,
845 #endif /* CONFIG_POSIX_TIMERS */
848 /* Suspend hook structures */
849 static const struct dev_pm_ops alarmtimer_pm_ops
= {
850 .suspend
= alarmtimer_suspend
,
851 .resume
= alarmtimer_resume
,
854 static struct platform_driver alarmtimer_driver
= {
856 .name
= "alarmtimer",
857 .pm
= &alarmtimer_pm_ops
,
862 * alarmtimer_init - Initialize alarm timer code
864 * This function initializes the alarm bases and registers
865 * the posix clock ids.
867 static int __init
alarmtimer_init(void)
869 struct platform_device
*pdev
;
873 alarmtimer_rtc_timer_init();
875 /* Initialize alarm bases */
876 alarm_bases
[ALARM_REALTIME
].base_clockid
= CLOCK_REALTIME
;
877 alarm_bases
[ALARM_REALTIME
].gettime
= &ktime_get_real
;
878 alarm_bases
[ALARM_BOOTTIME
].base_clockid
= CLOCK_BOOTTIME
;
879 alarm_bases
[ALARM_BOOTTIME
].gettime
= &ktime_get_boottime
;
880 for (i
= 0; i
< ALARM_NUMTYPE
; i
++) {
881 timerqueue_init_head(&alarm_bases
[i
].timerqueue
);
882 spin_lock_init(&alarm_bases
[i
].lock
);
885 error
= alarmtimer_rtc_interface_setup();
889 error
= platform_driver_register(&alarmtimer_driver
);
893 pdev
= platform_device_register_simple("alarmtimer", -1, NULL
, 0);
895 error
= PTR_ERR(pdev
);
901 platform_driver_unregister(&alarmtimer_driver
);
903 alarmtimer_rtc_interface_remove();
906 device_initcall(alarmtimer_init
);