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15#include <linux/time.h>
16#include <linux/hrtimer.h>
17#include <linux/timerqueue.h>
18#include <linux/rtc.h>
19#include <linux/sched/signal.h>
20#include <linux/sched/debug.h>
21#include <linux/alarmtimer.h>
22#include <linux/mutex.h>
23#include <linux/platform_device.h>
24#include <linux/posix-timers.h>
25#include <linux/workqueue.h>
26#include <linux/freezer.h>
27#include <linux/compat.h>
28#include <linux/module.h>
29#include <linux/time_namespace.h>
30
31#include "posix-timers.h"
32
33#define CREATE_TRACE_POINTS
34#include <trace/events/alarmtimer.h>
35
36
37
38
39
40
41
42
43
44static struct alarm_base {
45 spinlock_t lock;
46 struct timerqueue_head timerqueue;
47 ktime_t (*get_ktime)(void);
48 void (*get_timespec)(struct timespec64 *tp);
49 clockid_t base_clockid;
50} alarm_bases[ALARM_NUMTYPE];
51
52#if defined(CONFIG_POSIX_TIMERS) || defined(CONFIG_RTC_CLASS)
53
54static enum alarmtimer_type freezer_alarmtype;
55static ktime_t freezer_expires;
56static ktime_t freezer_delta;
57static DEFINE_SPINLOCK(freezer_delta_lock);
58#endif
59
60#ifdef CONFIG_RTC_CLASS
61
62static struct rtc_timer rtctimer;
63static struct rtc_device *rtcdev;
64static DEFINE_SPINLOCK(rtcdev_lock);
65
66
67
68
69
70
71struct rtc_device *alarmtimer_get_rtcdev(void)
72{
73 unsigned long flags;
74 struct rtc_device *ret;
75
76 spin_lock_irqsave(&rtcdev_lock, flags);
77 ret = rtcdev;
78 spin_unlock_irqrestore(&rtcdev_lock, flags);
79
80 return ret;
81}
82EXPORT_SYMBOL_GPL(alarmtimer_get_rtcdev);
83
84static int alarmtimer_rtc_add_device(struct device *dev,
85 struct class_interface *class_intf)
86{
87 unsigned long flags;
88 struct rtc_device *rtc = to_rtc_device(dev);
89 struct platform_device *pdev;
90 int ret = 0;
91
92 if (rtcdev)
93 return -EBUSY;
94
95 if (!test_bit(RTC_FEATURE_ALARM, rtc->features))
96 return -1;
97 if (!device_may_wakeup(rtc->dev.parent))
98 return -1;
99
100 pdev = platform_device_register_data(dev, "alarmtimer",
101 PLATFORM_DEVID_AUTO, NULL, 0);
102 if (!IS_ERR(pdev))
103 device_init_wakeup(&pdev->dev, true);
104
105 spin_lock_irqsave(&rtcdev_lock, flags);
106 if (!IS_ERR(pdev) && !rtcdev) {
107 if (!try_module_get(rtc->owner)) {
108 ret = -1;
109 goto unlock;
110 }
111
112 rtcdev = rtc;
113
114 get_device(dev);
115 pdev = NULL;
116 } else {
117 ret = -1;
118 }
119unlock:
120 spin_unlock_irqrestore(&rtcdev_lock, flags);
121
122 platform_device_unregister(pdev);
123
124 return ret;
125}
126
127static inline void alarmtimer_rtc_timer_init(void)
128{
129 rtc_timer_init(&rtctimer, NULL, NULL);
130}
131
132static struct class_interface alarmtimer_rtc_interface = {
133 .add_dev = &alarmtimer_rtc_add_device,
134};
135
136static int alarmtimer_rtc_interface_setup(void)
137{
138 alarmtimer_rtc_interface.class = rtc_class;
139 return class_interface_register(&alarmtimer_rtc_interface);
140}
141static void alarmtimer_rtc_interface_remove(void)
142{
143 class_interface_unregister(&alarmtimer_rtc_interface);
144}
145#else
146static inline int alarmtimer_rtc_interface_setup(void) { return 0; }
147static inline void alarmtimer_rtc_interface_remove(void) { }
148static inline void alarmtimer_rtc_timer_init(void) { }
149#endif
150
151
152
153
154
155
156
157
158
159
160static void alarmtimer_enqueue(struct alarm_base *base, struct alarm *alarm)
161{
162 if (alarm->state & ALARMTIMER_STATE_ENQUEUED)
163 timerqueue_del(&base->timerqueue, &alarm->node);
164
165 timerqueue_add(&base->timerqueue, &alarm->node);
166 alarm->state |= ALARMTIMER_STATE_ENQUEUED;
167}
168
169
170
171
172
173
174
175
176
177
178static void alarmtimer_dequeue(struct alarm_base *base, struct alarm *alarm)
179{
180 if (!(alarm->state & ALARMTIMER_STATE_ENQUEUED))
181 return;
182
183 timerqueue_del(&base->timerqueue, &alarm->node);
184 alarm->state &= ~ALARMTIMER_STATE_ENQUEUED;
185}
186
187
188
189
190
191
192
193
194
195
196
197static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer)
198{
199 struct alarm *alarm = container_of(timer, struct alarm, timer);
200 struct alarm_base *base = &alarm_bases[alarm->type];
201 unsigned long flags;
202 int ret = HRTIMER_NORESTART;
203 int restart = ALARMTIMER_NORESTART;
204
205 spin_lock_irqsave(&base->lock, flags);
206 alarmtimer_dequeue(base, alarm);
207 spin_unlock_irqrestore(&base->lock, flags);
208
209 if (alarm->function)
210 restart = alarm->function(alarm, base->get_ktime());
211
212 spin_lock_irqsave(&base->lock, flags);
213 if (restart != ALARMTIMER_NORESTART) {
214 hrtimer_set_expires(&alarm->timer, alarm->node.expires);
215 alarmtimer_enqueue(base, alarm);
216 ret = HRTIMER_RESTART;
217 }
218 spin_unlock_irqrestore(&base->lock, flags);
219
220 trace_alarmtimer_fired(alarm, base->get_ktime());
221 return ret;
222
223}
224
225ktime_t alarm_expires_remaining(const struct alarm *alarm)
226{
227 struct alarm_base *base = &alarm_bases[alarm->type];
228 return ktime_sub(alarm->node.expires, base->get_ktime());
229}
230EXPORT_SYMBOL_GPL(alarm_expires_remaining);
231
232#ifdef CONFIG_RTC_CLASS
233
234
235
236
237
238
239
240
241
242static int alarmtimer_suspend(struct device *dev)
243{
244 ktime_t min, now, expires;
245 int i, ret, type;
246 struct rtc_device *rtc;
247 unsigned long flags;
248 struct rtc_time tm;
249
250 spin_lock_irqsave(&freezer_delta_lock, flags);
251 min = freezer_delta;
252 expires = freezer_expires;
253 type = freezer_alarmtype;
254 freezer_delta = 0;
255 spin_unlock_irqrestore(&freezer_delta_lock, flags);
256
257 rtc = alarmtimer_get_rtcdev();
258
259 if (!rtc)
260 return 0;
261
262
263 for (i = 0; i < ALARM_NUMTYPE; i++) {
264 struct alarm_base *base = &alarm_bases[i];
265 struct timerqueue_node *next;
266 ktime_t delta;
267
268 spin_lock_irqsave(&base->lock, flags);
269 next = timerqueue_getnext(&base->timerqueue);
270 spin_unlock_irqrestore(&base->lock, flags);
271 if (!next)
272 continue;
273 delta = ktime_sub(next->expires, base->get_ktime());
274 if (!min || (delta < min)) {
275 expires = next->expires;
276 min = delta;
277 type = i;
278 }
279 }
280 if (min == 0)
281 return 0;
282
283 if (ktime_to_ns(min) < 2 * NSEC_PER_SEC) {
284 pm_wakeup_event(dev, 2 * MSEC_PER_SEC);
285 return -EBUSY;
286 }
287
288 trace_alarmtimer_suspend(expires, type);
289
290
291 rtc_timer_cancel(rtc, &rtctimer);
292 rtc_read_time(rtc, &tm);
293 now = rtc_tm_to_ktime(tm);
294 now = ktime_add(now, min);
295
296
297 ret = rtc_timer_start(rtc, &rtctimer, now, 0);
298 if (ret < 0)
299 pm_wakeup_event(dev, MSEC_PER_SEC);
300 return ret;
301}
302
303static int alarmtimer_resume(struct device *dev)
304{
305 struct rtc_device *rtc;
306
307 rtc = alarmtimer_get_rtcdev();
308 if (rtc)
309 rtc_timer_cancel(rtc, &rtctimer);
310 return 0;
311}
312
313#else
314static int alarmtimer_suspend(struct device *dev)
315{
316 return 0;
317}
318
319static int alarmtimer_resume(struct device *dev)
320{
321 return 0;
322}
323#endif
324
325static void
326__alarm_init(struct alarm *alarm, enum alarmtimer_type type,
327 enum alarmtimer_restart (*function)(struct alarm *, ktime_t))
328{
329 timerqueue_init(&alarm->node);
330 alarm->timer.function = alarmtimer_fired;
331 alarm->function = function;
332 alarm->type = type;
333 alarm->state = ALARMTIMER_STATE_INACTIVE;
334}
335
336
337
338
339
340
341
342void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
343 enum alarmtimer_restart (*function)(struct alarm *, ktime_t))
344{
345 hrtimer_init(&alarm->timer, alarm_bases[type].base_clockid,
346 HRTIMER_MODE_ABS);
347 __alarm_init(alarm, type, function);
348}
349EXPORT_SYMBOL_GPL(alarm_init);
350
351
352
353
354
355
356void alarm_start(struct alarm *alarm, ktime_t start)
357{
358 struct alarm_base *base = &alarm_bases[alarm->type];
359 unsigned long flags;
360
361 spin_lock_irqsave(&base->lock, flags);
362 alarm->node.expires = start;
363 alarmtimer_enqueue(base, alarm);
364 hrtimer_start(&alarm->timer, alarm->node.expires, HRTIMER_MODE_ABS);
365 spin_unlock_irqrestore(&base->lock, flags);
366
367 trace_alarmtimer_start(alarm, base->get_ktime());
368}
369EXPORT_SYMBOL_GPL(alarm_start);
370
371
372
373
374
375
376void alarm_start_relative(struct alarm *alarm, ktime_t start)
377{
378 struct alarm_base *base = &alarm_bases[alarm->type];
379
380 start = ktime_add_safe(start, base->get_ktime());
381 alarm_start(alarm, start);
382}
383EXPORT_SYMBOL_GPL(alarm_start_relative);
384
385void alarm_restart(struct alarm *alarm)
386{
387 struct alarm_base *base = &alarm_bases[alarm->type];
388 unsigned long flags;
389
390 spin_lock_irqsave(&base->lock, flags);
391 hrtimer_set_expires(&alarm->timer, alarm->node.expires);
392 hrtimer_restart(&alarm->timer);
393 alarmtimer_enqueue(base, alarm);
394 spin_unlock_irqrestore(&base->lock, flags);
395}
396EXPORT_SYMBOL_GPL(alarm_restart);
397
398
399
400
401
402
403
404
405int alarm_try_to_cancel(struct alarm *alarm)
406{
407 struct alarm_base *base = &alarm_bases[alarm->type];
408 unsigned long flags;
409 int ret;
410
411 spin_lock_irqsave(&base->lock, flags);
412 ret = hrtimer_try_to_cancel(&alarm->timer);
413 if (ret >= 0)
414 alarmtimer_dequeue(base, alarm);
415 spin_unlock_irqrestore(&base->lock, flags);
416
417 trace_alarmtimer_cancel(alarm, base->get_ktime());
418 return ret;
419}
420EXPORT_SYMBOL_GPL(alarm_try_to_cancel);
421
422
423
424
425
426
427
428
429int alarm_cancel(struct alarm *alarm)
430{
431 for (;;) {
432 int ret = alarm_try_to_cancel(alarm);
433 if (ret >= 0)
434 return ret;
435 hrtimer_cancel_wait_running(&alarm->timer);
436 }
437}
438EXPORT_SYMBOL_GPL(alarm_cancel);
439
440
441u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval)
442{
443 u64 overrun = 1;
444 ktime_t delta;
445
446 delta = ktime_sub(now, alarm->node.expires);
447
448 if (delta < 0)
449 return 0;
450
451 if (unlikely(delta >= interval)) {
452 s64 incr = ktime_to_ns(interval);
453
454 overrun = ktime_divns(delta, incr);
455
456 alarm->node.expires = ktime_add_ns(alarm->node.expires,
457 incr*overrun);
458
459 if (alarm->node.expires > now)
460 return overrun;
461
462
463
464
465 overrun++;
466 }
467
468 alarm->node.expires = ktime_add_safe(alarm->node.expires, interval);
469 return overrun;
470}
471EXPORT_SYMBOL_GPL(alarm_forward);
472
473u64 alarm_forward_now(struct alarm *alarm, ktime_t interval)
474{
475 struct alarm_base *base = &alarm_bases[alarm->type];
476
477 return alarm_forward(alarm, base->get_ktime(), interval);
478}
479EXPORT_SYMBOL_GPL(alarm_forward_now);
480
481#ifdef CONFIG_POSIX_TIMERS
482
483static void alarmtimer_freezerset(ktime_t absexp, enum alarmtimer_type type)
484{
485 struct alarm_base *base;
486 unsigned long flags;
487 ktime_t delta;
488
489 switch(type) {
490 case ALARM_REALTIME:
491 base = &alarm_bases[ALARM_REALTIME];
492 type = ALARM_REALTIME_FREEZER;
493 break;
494 case ALARM_BOOTTIME:
495 base = &alarm_bases[ALARM_BOOTTIME];
496 type = ALARM_BOOTTIME_FREEZER;
497 break;
498 default:
499 WARN_ONCE(1, "Invalid alarm type: %d\n", type);
500 return;
501 }
502
503 delta = ktime_sub(absexp, base->get_ktime());
504
505 spin_lock_irqsave(&freezer_delta_lock, flags);
506 if (!freezer_delta || (delta < freezer_delta)) {
507 freezer_delta = delta;
508 freezer_expires = absexp;
509 freezer_alarmtype = type;
510 }
511 spin_unlock_irqrestore(&freezer_delta_lock, flags);
512}
513
514
515
516
517
518static enum alarmtimer_type clock2alarm(clockid_t clockid)
519{
520 if (clockid == CLOCK_REALTIME_ALARM)
521 return ALARM_REALTIME;
522 if (clockid == CLOCK_BOOTTIME_ALARM)
523 return ALARM_BOOTTIME;
524 return -1;
525}
526
527
528
529
530
531
532
533
534
535
536static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm,
537 ktime_t now)
538{
539 struct k_itimer *ptr = container_of(alarm, struct k_itimer,
540 it.alarm.alarmtimer);
541 enum alarmtimer_restart result = ALARMTIMER_NORESTART;
542 unsigned long flags;
543 int si_private = 0;
544
545 spin_lock_irqsave(&ptr->it_lock, flags);
546
547 ptr->it_active = 0;
548 if (ptr->it_interval)
549 si_private = ++ptr->it_requeue_pending;
550
551 if (posix_timer_event(ptr, si_private) && ptr->it_interval) {
552
553
554
555
556 ptr->it_overrun += alarm_forward_now(alarm, ptr->it_interval);
557 ++ptr->it_requeue_pending;
558 ptr->it_active = 1;
559 result = ALARMTIMER_RESTART;
560 }
561 spin_unlock_irqrestore(&ptr->it_lock, flags);
562
563 return result;
564}
565
566
567
568
569
570static void alarm_timer_rearm(struct k_itimer *timr)
571{
572 struct alarm *alarm = &timr->it.alarm.alarmtimer;
573
574 timr->it_overrun += alarm_forward_now(alarm, timr->it_interval);
575 alarm_start(alarm, alarm->node.expires);
576}
577
578
579
580
581
582
583static s64 alarm_timer_forward(struct k_itimer *timr, ktime_t now)
584{
585 struct alarm *alarm = &timr->it.alarm.alarmtimer;
586
587 return alarm_forward(alarm, timr->it_interval, now);
588}
589
590
591
592
593
594
595static ktime_t alarm_timer_remaining(struct k_itimer *timr, ktime_t now)
596{
597 struct alarm *alarm = &timr->it.alarm.alarmtimer;
598
599 return ktime_sub(alarm->node.expires, now);
600}
601
602
603
604
605
606static int alarm_timer_try_to_cancel(struct k_itimer *timr)
607{
608 return alarm_try_to_cancel(&timr->it.alarm.alarmtimer);
609}
610
611
612
613
614
615
616
617
618
619static void alarm_timer_wait_running(struct k_itimer *timr)
620{
621 hrtimer_cancel_wait_running(&timr->it.alarm.alarmtimer.timer);
622}
623
624
625
626
627
628
629
630
631static void alarm_timer_arm(struct k_itimer *timr, ktime_t expires,
632 bool absolute, bool sigev_none)
633{
634 struct alarm *alarm = &timr->it.alarm.alarmtimer;
635 struct alarm_base *base = &alarm_bases[alarm->type];
636
637 if (!absolute)
638 expires = ktime_add_safe(expires, base->get_ktime());
639 if (sigev_none)
640 alarm->node.expires = expires;
641 else
642 alarm_start(&timr->it.alarm.alarmtimer, expires);
643}
644
645
646
647
648
649
650
651
652static int alarm_clock_getres(const clockid_t which_clock, struct timespec64 *tp)
653{
654 if (!alarmtimer_get_rtcdev())
655 return -EINVAL;
656
657 tp->tv_sec = 0;
658 tp->tv_nsec = hrtimer_resolution;
659 return 0;
660}
661
662
663
664
665
666
667
668
669static int alarm_clock_get_timespec(clockid_t which_clock, struct timespec64 *tp)
670{
671 struct alarm_base *base = &alarm_bases[clock2alarm(which_clock)];
672
673 if (!alarmtimer_get_rtcdev())
674 return -EINVAL;
675
676 base->get_timespec(tp);
677
678 return 0;
679}
680
681
682
683
684
685
686
687static ktime_t alarm_clock_get_ktime(clockid_t which_clock)
688{
689 struct alarm_base *base = &alarm_bases[clock2alarm(which_clock)];
690
691 if (!alarmtimer_get_rtcdev())
692 return -EINVAL;
693
694 return base->get_ktime();
695}
696
697
698
699
700
701
702
703static int alarm_timer_create(struct k_itimer *new_timer)
704{
705 enum alarmtimer_type type;
706
707 if (!alarmtimer_get_rtcdev())
708 return -EOPNOTSUPP;
709
710 if (!capable(CAP_WAKE_ALARM))
711 return -EPERM;
712
713 type = clock2alarm(new_timer->it_clock);
714 alarm_init(&new_timer->it.alarm.alarmtimer, type, alarm_handle_timer);
715 return 0;
716}
717
718
719
720
721
722
723
724
725
726
727static enum alarmtimer_restart alarmtimer_nsleep_wakeup(struct alarm *alarm,
728 ktime_t now)
729{
730 struct task_struct *task = (struct task_struct *)alarm->data;
731
732 alarm->data = NULL;
733 if (task)
734 wake_up_process(task);
735 return ALARMTIMER_NORESTART;
736}
737
738
739
740
741
742
743
744
745
746static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp,
747 enum alarmtimer_type type)
748{
749 struct restart_block *restart;
750 alarm->data = (void *)current;
751 do {
752 set_current_state(TASK_INTERRUPTIBLE);
753 alarm_start(alarm, absexp);
754 if (likely(alarm->data))
755 schedule();
756
757 alarm_cancel(alarm);
758 } while (alarm->data && !signal_pending(current));
759
760 __set_current_state(TASK_RUNNING);
761
762 destroy_hrtimer_on_stack(&alarm->timer);
763
764 if (!alarm->data)
765 return 0;
766
767 if (freezing(current))
768 alarmtimer_freezerset(absexp, type);
769 restart = ¤t->restart_block;
770 if (restart->nanosleep.type != TT_NONE) {
771 struct timespec64 rmt;
772 ktime_t rem;
773
774 rem = ktime_sub(absexp, alarm_bases[type].get_ktime());
775
776 if (rem <= 0)
777 return 0;
778 rmt = ktime_to_timespec64(rem);
779
780 return nanosleep_copyout(restart, &rmt);
781 }
782 return -ERESTART_RESTARTBLOCK;
783}
784
785static void
786alarm_init_on_stack(struct alarm *alarm, enum alarmtimer_type type,
787 enum alarmtimer_restart (*function)(struct alarm *, ktime_t))
788{
789 hrtimer_init_on_stack(&alarm->timer, alarm_bases[type].base_clockid,
790 HRTIMER_MODE_ABS);
791 __alarm_init(alarm, type, function);
792}
793
794
795
796
797
798
799
800static long __sched alarm_timer_nsleep_restart(struct restart_block *restart)
801{
802 enum alarmtimer_type type = restart->nanosleep.clockid;
803 ktime_t exp = restart->nanosleep.expires;
804 struct alarm alarm;
805
806 alarm_init_on_stack(&alarm, type, alarmtimer_nsleep_wakeup);
807
808 return alarmtimer_do_nsleep(&alarm, exp, type);
809}
810
811
812
813
814
815
816
817
818
819static int alarm_timer_nsleep(const clockid_t which_clock, int flags,
820 const struct timespec64 *tsreq)
821{
822 enum alarmtimer_type type = clock2alarm(which_clock);
823 struct restart_block *restart = ¤t->restart_block;
824 struct alarm alarm;
825 ktime_t exp;
826 int ret = 0;
827
828 if (!alarmtimer_get_rtcdev())
829 return -EOPNOTSUPP;
830
831 if (flags & ~TIMER_ABSTIME)
832 return -EINVAL;
833
834 if (!capable(CAP_WAKE_ALARM))
835 return -EPERM;
836
837 alarm_init_on_stack(&alarm, type, alarmtimer_nsleep_wakeup);
838
839 exp = timespec64_to_ktime(*tsreq);
840
841 if (flags != TIMER_ABSTIME) {
842 ktime_t now = alarm_bases[type].get_ktime();
843
844 exp = ktime_add_safe(now, exp);
845 } else {
846 exp = timens_ktime_to_host(which_clock, exp);
847 }
848
849 ret = alarmtimer_do_nsleep(&alarm, exp, type);
850 if (ret != -ERESTART_RESTARTBLOCK)
851 return ret;
852
853
854 if (flags == TIMER_ABSTIME)
855 return -ERESTARTNOHAND;
856
857 restart->nanosleep.clockid = type;
858 restart->nanosleep.expires = exp;
859 set_restart_fn(restart, alarm_timer_nsleep_restart);
860 return ret;
861}
862
863const struct k_clock alarm_clock = {
864 .clock_getres = alarm_clock_getres,
865 .clock_get_ktime = alarm_clock_get_ktime,
866 .clock_get_timespec = alarm_clock_get_timespec,
867 .timer_create = alarm_timer_create,
868 .timer_set = common_timer_set,
869 .timer_del = common_timer_del,
870 .timer_get = common_timer_get,
871 .timer_arm = alarm_timer_arm,
872 .timer_rearm = alarm_timer_rearm,
873 .timer_forward = alarm_timer_forward,
874 .timer_remaining = alarm_timer_remaining,
875 .timer_try_to_cancel = alarm_timer_try_to_cancel,
876 .timer_wait_running = alarm_timer_wait_running,
877 .nsleep = alarm_timer_nsleep,
878};
879#endif
880
881
882
883static const struct dev_pm_ops alarmtimer_pm_ops = {
884 .suspend = alarmtimer_suspend,
885 .resume = alarmtimer_resume,
886};
887
888static struct platform_driver alarmtimer_driver = {
889 .driver = {
890 .name = "alarmtimer",
891 .pm = &alarmtimer_pm_ops,
892 }
893};
894
895static void get_boottime_timespec(struct timespec64 *tp)
896{
897 ktime_get_boottime_ts64(tp);
898 timens_add_boottime(tp);
899}
900
901
902
903
904
905
906
907static int __init alarmtimer_init(void)
908{
909 int error;
910 int i;
911
912 alarmtimer_rtc_timer_init();
913
914
915 alarm_bases[ALARM_REALTIME].base_clockid = CLOCK_REALTIME;
916 alarm_bases[ALARM_REALTIME].get_ktime = &ktime_get_real;
917 alarm_bases[ALARM_REALTIME].get_timespec = ktime_get_real_ts64;
918 alarm_bases[ALARM_BOOTTIME].base_clockid = CLOCK_BOOTTIME;
919 alarm_bases[ALARM_BOOTTIME].get_ktime = &ktime_get_boottime;
920 alarm_bases[ALARM_BOOTTIME].get_timespec = get_boottime_timespec;
921 for (i = 0; i < ALARM_NUMTYPE; i++) {
922 timerqueue_init_head(&alarm_bases[i].timerqueue);
923 spin_lock_init(&alarm_bases[i].lock);
924 }
925
926 error = alarmtimer_rtc_interface_setup();
927 if (error)
928 return error;
929
930 error = platform_driver_register(&alarmtimer_driver);
931 if (error)
932 goto out_if;
933
934 return 0;
935out_if:
936 alarmtimer_rtc_interface_remove();
937 return error;
938}
939device_initcall(alarmtimer_init);
940