20 static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer);
21 static void rtc_timer_remove(struct rtc_device *rtc, struct rtc_timer *timer);
23 static void rtc_add_offset(struct rtc_device *rtc, struct rtc_time *tm)  in rtc_add_offset()  argument
27 	if (!rtc->offset_secs)  in rtc_add_offset()
38 	if ((rtc->start_secs > rtc->range_min && secs >= rtc->start_secs) ||  in rtc_add_offset()
39 	    (rtc->start_secs < rtc->range_min &&  in rtc_add_offset()
40 	     secs <= (rtc->start_secs + rtc->range_max - rtc->range_min)))  in rtc_add_offset()
43 	rtc_time64_to_tm(secs + rtc->offset_secs, tm);  in rtc_add_offset()
46 static void rtc_subtract_offset(struct rtc_device *rtc, struct rtc_time *tm)  in rtc_subtract_offset()  argument
50 	if (!rtc->offset_secs)  in rtc_subtract_offset()
61 	if (secs >= rtc->range_min && secs <= rtc->range_max)  in rtc_subtract_offset()
64 	rtc_time64_to_tm(secs - rtc->offset_secs, tm);  in rtc_subtract_offset()
67 static int rtc_valid_range(struct rtc_device *rtc, struct rtc_time *tm)  in rtc_valid_range()  argument
69 	if (rtc->range_min != rtc->range_max) {  in rtc_valid_range()
71 		time64_t range_min = rtc->set_start_time ? rtc->start_secs :  in rtc_valid_range()
72 			rtc->range_min;  in rtc_valid_range()
73 		time64_t range_max = rtc->set_start_time ?  in rtc_valid_range()
74 			(rtc->start_secs + rtc->range_max - rtc->range_min) :  in rtc_valid_range()
75 			rtc->range_max;  in rtc_valid_range()
84 static int __rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm)  in __rtc_read_time()  argument
88 	if (!rtc->ops) {  in __rtc_read_time()
90 	} else if (!rtc->ops->read_time) {  in __rtc_read_time()
94 		err = rtc->ops->read_time(rtc->dev.parent, tm);  in __rtc_read_time()
96 			dev_dbg(&rtc->dev, "read_time: fail to read: %d\n",  in __rtc_read_time()
101 		rtc_add_offset(rtc, tm);  in __rtc_read_time()
105 			dev_dbg(&rtc->dev, "read_time: rtc_time isn't valid\n");  in __rtc_read_time()
110 int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm)  in rtc_read_time()  argument
114 	err = mutex_lock_interruptible(&rtc->ops_lock);  in rtc_read_time()
118 	err = __rtc_read_time(rtc, tm);  in rtc_read_time()
119 	mutex_unlock(&rtc->ops_lock);  in rtc_read_time()
126 int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm)  in rtc_set_time()  argument
134 	err = rtc_valid_range(rtc, tm);  in rtc_set_time()
138 	rtc_subtract_offset(rtc, tm);  in rtc_set_time()
140 	err = mutex_lock_interruptible(&rtc->ops_lock);  in rtc_set_time()
144 	if (!rtc->ops)  in rtc_set_time()
146 	else if (rtc->ops->set_time)  in rtc_set_time()
147 		err = rtc->ops->set_time(rtc->dev.parent, tm);  in rtc_set_time()
151 	pm_stay_awake(rtc->dev.parent);  in rtc_set_time()
152 	mutex_unlock(&rtc->ops_lock);  in rtc_set_time()
154 	schedule_work(&rtc->irqwork);  in rtc_set_time()
161 static int rtc_read_alarm_internal(struct rtc_device *rtc,  in rtc_read_alarm_internal()  argument
166 	err = mutex_lock_interruptible(&rtc->ops_lock);  in rtc_read_alarm_internal()
170 	if (!rtc->ops) {  in rtc_read_alarm_internal()
172 	} else if (!rtc->ops->read_alarm) {  in rtc_read_alarm_internal()
186 		err = rtc->ops->read_alarm(rtc->dev.parent, alarm);  in rtc_read_alarm_internal()
189 	mutex_unlock(&rtc->ops_lock);  in rtc_read_alarm_internal()
195 int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)  in __rtc_read_alarm()  argument
246 	err = rtc_read_time(rtc, &before);  in __rtc_read_alarm()
255 		err = rtc_read_alarm_internal(rtc, alarm);  in __rtc_read_alarm()
261 			rtc_add_offset(rtc, &alarm->time);  in __rtc_read_alarm()
266 		err = rtc_read_time(rtc, &now);  in __rtc_read_alarm()
322 		dev_dbg(&rtc->dev, "alarm rollover: %s\n", "day");  in __rtc_read_alarm()
333 		dev_dbg(&rtc->dev, "alarm rollover: %s\n", "month");  in __rtc_read_alarm()
348 		dev_dbg(&rtc->dev, "alarm rollover: %s\n", "year");  in __rtc_read_alarm()
356 		dev_warn(&rtc->dev, "alarm rollover not handled\n");  in __rtc_read_alarm()
363 		dev_warn(&rtc->dev, "invalid alarm value: %ptR\n",  in __rtc_read_alarm()
369 int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)  in rtc_read_alarm()  argument
373 	err = mutex_lock_interruptible(&rtc->ops_lock);  in rtc_read_alarm()
376 	if (!rtc->ops) {  in rtc_read_alarm()
378 	} else if (!rtc->ops->read_alarm) {  in rtc_read_alarm()
382 		alarm->enabled = rtc->aie_timer.enabled;  in rtc_read_alarm()
383 		alarm->time = rtc_ktime_to_tm(rtc->aie_timer.node.expires);  in rtc_read_alarm()
385 	mutex_unlock(&rtc->ops_lock);  in rtc_read_alarm()
392 static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)  in __rtc_set_alarm()  argument
405 	err = __rtc_read_time(rtc, &tm);  in __rtc_set_alarm()
418 	rtc_subtract_offset(rtc, &alarm->time);  in __rtc_set_alarm()
420 	if (!rtc->ops)  in __rtc_set_alarm()
422 	else if (!rtc->ops->set_alarm)  in __rtc_set_alarm()
425 		err = rtc->ops->set_alarm(rtc->dev.parent, alarm);  in __rtc_set_alarm()
431 int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)  in rtc_set_alarm()  argument
435 	if (!rtc->ops)  in rtc_set_alarm()
437 	else if (!rtc->ops->set_alarm)  in rtc_set_alarm()
444 	err = rtc_valid_range(rtc, &alarm->time);  in rtc_set_alarm()
448 	err = mutex_lock_interruptible(&rtc->ops_lock);  in rtc_set_alarm()
451 	if (rtc->aie_timer.enabled)  in rtc_set_alarm()
452 		rtc_timer_remove(rtc, &rtc->aie_timer);  in rtc_set_alarm()
454 	rtc->aie_timer.node.expires = rtc_tm_to_ktime(alarm->time);  in rtc_set_alarm()
455 	rtc->aie_timer.period = 0;  in rtc_set_alarm()
457 		err = rtc_timer_enqueue(rtc, &rtc->aie_timer);  in rtc_set_alarm()
459 	mutex_unlock(&rtc->ops_lock);  in rtc_set_alarm()
466 int rtc_initialize_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)  in rtc_initialize_alarm()  argument
475 	err = rtc_read_time(rtc, &now);  in rtc_initialize_alarm()
479 	err = mutex_lock_interruptible(&rtc->ops_lock);  in rtc_initialize_alarm()
483 	rtc->aie_timer.node.expires = rtc_tm_to_ktime(alarm->time);  in rtc_initialize_alarm()
484 	rtc->aie_timer.period = 0;  in rtc_initialize_alarm()
488 			 rtc->aie_timer.node.expires)) {  in rtc_initialize_alarm()
489 		rtc->aie_timer.enabled = 1;  in rtc_initialize_alarm()
490 		timerqueue_add(&rtc->timerqueue, &rtc->aie_timer.node);  in rtc_initialize_alarm()
491 		trace_rtc_timer_enqueue(&rtc->aie_timer);  in rtc_initialize_alarm()
493 	mutex_unlock(&rtc->ops_lock);  in rtc_initialize_alarm()
498 int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled)  in rtc_alarm_irq_enable()  argument
502 	err = mutex_lock_interruptible(&rtc->ops_lock);  in rtc_alarm_irq_enable()
506 	if (rtc->aie_timer.enabled != enabled) {  in rtc_alarm_irq_enable()
508 			err = rtc_timer_enqueue(rtc, &rtc->aie_timer);  in rtc_alarm_irq_enable()
510 			rtc_timer_remove(rtc, &rtc->aie_timer);  in rtc_alarm_irq_enable()
515 	else if (!rtc->ops)  in rtc_alarm_irq_enable()
517 	else if (!rtc->ops->alarm_irq_enable)  in rtc_alarm_irq_enable()
520 		err = rtc->ops->alarm_irq_enable(rtc->dev.parent, enabled);  in rtc_alarm_irq_enable()
522 	mutex_unlock(&rtc->ops_lock);  in rtc_alarm_irq_enable()
529 int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled)  in rtc_update_irq_enable()  argument
533 	err = mutex_lock_interruptible(&rtc->ops_lock);  in rtc_update_irq_enable()
538 	if (enabled == 0 && rtc->uie_irq_active) {  in rtc_update_irq_enable()
539 		mutex_unlock(&rtc->ops_lock);  in rtc_update_irq_enable()
540 		return rtc_dev_update_irq_enable_emul(rtc, 0);  in rtc_update_irq_enable()
544 	if (rtc->uie_rtctimer.enabled == enabled)  in rtc_update_irq_enable()
547 	if (rtc->uie_unsupported) {  in rtc_update_irq_enable()
556 		__rtc_read_time(rtc, &tm);  in rtc_update_irq_enable()
559 		rtc->uie_rtctimer.node.expires = ktime_add(now, onesec);  in rtc_update_irq_enable()
560 		rtc->uie_rtctimer.period = ktime_set(1, 0);  in rtc_update_irq_enable()
561 		err = rtc_timer_enqueue(rtc, &rtc->uie_rtctimer);  in rtc_update_irq_enable()
563 		rtc_timer_remove(rtc, &rtc->uie_rtctimer);  in rtc_update_irq_enable()
567 	mutex_unlock(&rtc->ops_lock);  in rtc_update_irq_enable()
575 		err = rtc_dev_update_irq_enable_emul(rtc, enabled);  in rtc_update_irq_enable()
589 void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode)  in rtc_handle_legacy_irq()  argument
594 	spin_lock_irqsave(&rtc->irq_lock, flags);  in rtc_handle_legacy_irq()
595 	rtc->irq_data = (rtc->irq_data + (num << 8)) | (RTC_IRQF | mode);  in rtc_handle_legacy_irq()
596 	spin_unlock_irqrestore(&rtc->irq_lock, flags);  in rtc_handle_legacy_irq()
598 	wake_up_interruptible(&rtc->irq_queue);  in rtc_handle_legacy_irq()
599 	kill_fasync(&rtc->async_queue, SIGIO, POLL_IN);  in rtc_handle_legacy_irq()
608 void rtc_aie_update_irq(struct rtc_device *rtc)  in rtc_aie_update_irq()  argument
610 	rtc_handle_legacy_irq(rtc, 1, RTC_AF);  in rtc_aie_update_irq()
619 void rtc_uie_update_irq(struct rtc_device *rtc)  in rtc_uie_update_irq()  argument
621 	rtc_handle_legacy_irq(rtc, 1,  RTC_UF);  in rtc_uie_update_irq()
634 	struct rtc_device *rtc;  in rtc_pie_update_irq()  local
638 	rtc = container_of(timer, struct rtc_device, pie_timer);  in rtc_pie_update_irq()
640 	period = NSEC_PER_SEC / rtc->irq_freq;  in rtc_pie_update_irq()
643 	rtc_handle_legacy_irq(rtc, count, RTC_PF);  in rtc_pie_update_irq()
655 void rtc_update_irq(struct rtc_device *rtc,  in rtc_update_irq()  argument
658 	if (IS_ERR_OR_NULL(rtc))  in rtc_update_irq()
661 	pm_stay_awake(rtc->dev.parent);  in rtc_update_irq()
662 	schedule_work(&rtc->irqwork);  in rtc_update_irq()
669 	struct rtc_device *rtc = NULL;  in rtc_class_open()  local
673 		rtc = to_rtc_device(dev);  in rtc_class_open()
675 	if (rtc) {  in rtc_class_open()
676 		if (!try_module_get(rtc->owner)) {  in rtc_class_open()
678 			rtc = NULL;  in rtc_class_open()
682 	return rtc;  in rtc_class_open()
686 void rtc_class_close(struct rtc_device *rtc)  in rtc_class_close()  argument
688 	module_put(rtc->owner);  in rtc_class_close()
689 	put_device(&rtc->dev);  in rtc_class_close()
693 static int rtc_update_hrtimer(struct rtc_device *rtc, int enabled)  in rtc_update_hrtimer()  argument
705 	if (hrtimer_try_to_cancel(&rtc->pie_timer) < 0)  in rtc_update_hrtimer()
709 		ktime_t period = NSEC_PER_SEC / rtc->irq_freq;  in rtc_update_hrtimer()
711 		hrtimer_start(&rtc->pie_timer, period, HRTIMER_MODE_REL);  in rtc_update_hrtimer()
725 int rtc_irq_set_state(struct rtc_device *rtc, int enabled)  in rtc_irq_set_state()  argument
729 	while (rtc_update_hrtimer(rtc, enabled) < 0)  in rtc_irq_set_state()
732 	rtc->pie_enabled = enabled;  in rtc_irq_set_state()
747 int rtc_irq_set_freq(struct rtc_device *rtc, int freq)  in rtc_irq_set_freq()  argument
754 	rtc->irq_freq = freq;  in rtc_irq_set_freq()
755 	while (rtc->pie_enabled && rtc_update_hrtimer(rtc, 1) < 0)  in rtc_irq_set_freq()
774 static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer)  in rtc_timer_enqueue()  argument
776 	struct timerqueue_node *next = timerqueue_getnext(&rtc->timerqueue);  in rtc_timer_enqueue()
781 	__rtc_read_time(rtc, &tm);  in rtc_timer_enqueue()
791 	timerqueue_add(&rtc->timerqueue, &timer->node);  in rtc_timer_enqueue()
799 		err = __rtc_set_alarm(rtc, &alarm);  in rtc_timer_enqueue()
801 			pm_stay_awake(rtc->dev.parent);  in rtc_timer_enqueue()
802 			schedule_work(&rtc->irqwork);  in rtc_timer_enqueue()
804 			timerqueue_del(&rtc->timerqueue, &timer->node);  in rtc_timer_enqueue()
813 static void rtc_alarm_disable(struct rtc_device *rtc)  in rtc_alarm_disable()  argument
815 	if (!rtc->ops || !rtc->ops->alarm_irq_enable)  in rtc_alarm_disable()
818 	rtc->ops->alarm_irq_enable(rtc->dev.parent, false);  in rtc_alarm_disable()
834 static void rtc_timer_remove(struct rtc_device *rtc, struct rtc_timer *timer)  in rtc_timer_remove()  argument
836 	struct timerqueue_node *next = timerqueue_getnext(&rtc->timerqueue);  in rtc_timer_remove()
838 	timerqueue_del(&rtc->timerqueue, &timer->node);  in rtc_timer_remove()
845 		next = timerqueue_getnext(&rtc->timerqueue);  in rtc_timer_remove()
847 			rtc_alarm_disable(rtc);  in rtc_timer_remove()
852 		err = __rtc_set_alarm(rtc, &alarm);  in rtc_timer_remove()
854 			pm_stay_awake(rtc->dev.parent);  in rtc_timer_remove()
855 			schedule_work(&rtc->irqwork);  in rtc_timer_remove()
877 	struct rtc_device *rtc =  in rtc_timer_do_work()  local
880 	mutex_lock(&rtc->ops_lock);  in rtc_timer_do_work()
882 	__rtc_read_time(rtc, &tm);  in rtc_timer_do_work()
884 	while ((next = timerqueue_getnext(&rtc->timerqueue))) {  in rtc_timer_do_work()
890 		timerqueue_del(&rtc->timerqueue, &timer->node);  in rtc_timer_do_work()
894 			timer->func(timer->rtc);  in rtc_timer_do_work()
902 			timerqueue_add(&rtc->timerqueue, &timer->node);  in rtc_timer_do_work()
916 		err = __rtc_set_alarm(rtc, &alarm);  in rtc_timer_do_work()
924 			timerqueue_del(&rtc->timerqueue, &timer->node);  in rtc_timer_do_work()
927 			dev_err(&rtc->dev, "__rtc_set_alarm: err=%d\n", err);  in rtc_timer_do_work()
931 		rtc_alarm_disable(rtc);  in rtc_timer_do_work()
934 	pm_relax(rtc->dev.parent);  in rtc_timer_do_work()
935 	mutex_unlock(&rtc->ops_lock);  in rtc_timer_do_work()
946 		    struct rtc_device *rtc)  in rtc_timer_init()  argument
951 	timer->rtc = rtc;  in rtc_timer_init()
962 int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer *timer,  in rtc_timer_start()  argument
967 	mutex_lock(&rtc->ops_lock);  in rtc_timer_start()
969 		rtc_timer_remove(rtc, timer);  in rtc_timer_start()
974 	ret = rtc_timer_enqueue(rtc, timer);  in rtc_timer_start()
976 	mutex_unlock(&rtc->ops_lock);  in rtc_timer_start()
986 void rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer *timer)  in rtc_timer_cancel()  argument
988 	mutex_lock(&rtc->ops_lock);  in rtc_timer_cancel()
990 		rtc_timer_remove(rtc, timer);  in rtc_timer_cancel()
991 	mutex_unlock(&rtc->ops_lock);  in rtc_timer_cancel()
1005 int rtc_read_offset(struct rtc_device *rtc, long *offset)  in rtc_read_offset()  argument
1009 	if (!rtc->ops)  in rtc_read_offset()
1012 	if (!rtc->ops->read_offset)  in rtc_read_offset()
1015 	mutex_lock(&rtc->ops_lock);  in rtc_read_offset()
1016 	ret = rtc->ops->read_offset(rtc->dev.parent, offset);  in rtc_read_offset()
1017 	mutex_unlock(&rtc->ops_lock);  in rtc_read_offset()
1040 int rtc_set_offset(struct rtc_device *rtc, long offset)  in rtc_set_offset()  argument
1044 	if (!rtc->ops)  in rtc_set_offset()
1047 	if (!rtc->ops->set_offset)  in rtc_set_offset()
1050 	mutex_lock(&rtc->ops_lock);  in rtc_set_offset()
1051 	ret = rtc->ops->set_offset(rtc->dev.parent, offset);  in rtc_set_offset()
1052 	mutex_unlock(&rtc->ops_lock);  in rtc_set_offset()