Lines Matching full:rtc
2 * RTC subsystem, interface functions
14 #include <linux/rtc.h>
21 #include <trace/events/rtc.h>
23 static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer);
24 static void rtc_timer_remove(struct rtc_device *rtc, struct rtc_timer *timer);
26 static void rtc_add_offset(struct rtc_device *rtc, struct rtc_time *tm) in rtc_add_offset() argument
30 if (!rtc->offset_secs) in rtc_add_offset()
36 * Since the reading time values from RTC device are always in the RTC in rtc_add_offset()
41 if ((rtc->start_secs > rtc->range_min && secs >= rtc->start_secs) || in rtc_add_offset()
42 (rtc->start_secs < rtc->range_min && in rtc_add_offset()
43 secs <= (rtc->start_secs + rtc->range_max - rtc->range_min))) in rtc_add_offset()
46 rtc_time64_to_tm(secs + rtc->offset_secs, tm); in rtc_add_offset()
49 static void rtc_subtract_offset(struct rtc_device *rtc, struct rtc_time *tm) in rtc_subtract_offset() argument
53 if (!rtc->offset_secs) in rtc_subtract_offset()
59 * If the setting time values are in the valid range of RTC hardware in rtc_subtract_offset()
60 * device, then no need to subtract the offset when setting time to RTC in rtc_subtract_offset()
62 * values are valid for RTC hardware device. in rtc_subtract_offset()
64 if (secs >= rtc->range_min && secs <= rtc->range_max) in rtc_subtract_offset()
67 rtc_time64_to_tm(secs - rtc->offset_secs, tm); in rtc_subtract_offset()
70 static int rtc_valid_range(struct rtc_device *rtc, struct rtc_time *tm) in rtc_valid_range() argument
72 if (rtc->range_min != rtc->range_max) { in rtc_valid_range()
74 time64_t range_min = rtc->set_start_time ? rtc->start_secs : in rtc_valid_range()
75 rtc->range_min; in rtc_valid_range()
76 time64_t range_max = rtc->set_start_time ? in rtc_valid_range()
77 (rtc->start_secs + rtc->range_max - rtc->range_min) : in rtc_valid_range()
78 rtc->range_max; in rtc_valid_range()
87 static int __rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm) in __rtc_read_time() argument
90 if (!rtc->ops) in __rtc_read_time()
92 else if (!rtc->ops->read_time) in __rtc_read_time()
96 err = rtc->ops->read_time(rtc->dev.parent, tm); in __rtc_read_time()
98 dev_dbg(&rtc->dev, "read_time: fail to read: %d\n", in __rtc_read_time()
103 rtc_add_offset(rtc, tm); in __rtc_read_time()
107 dev_dbg(&rtc->dev, "read_time: rtc_time isn't valid\n"); in __rtc_read_time()
112 int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm) in rtc_read_time() argument
116 err = mutex_lock_interruptible(&rtc->ops_lock); in rtc_read_time()
120 err = __rtc_read_time(rtc, tm); in rtc_read_time()
121 mutex_unlock(&rtc->ops_lock); in rtc_read_time()
128 int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm) in rtc_set_time() argument
136 err = rtc_valid_range(rtc, tm); in rtc_set_time()
140 rtc_subtract_offset(rtc, tm); in rtc_set_time()
143 uie = rtc->uie_rtctimer.enabled || rtc->uie_irq_active; in rtc_set_time()
145 uie = rtc->uie_rtctimer.enabled; in rtc_set_time()
148 err = rtc_update_irq_enable(rtc, 0); in rtc_set_time()
153 err = mutex_lock_interruptible(&rtc->ops_lock); in rtc_set_time()
157 if (!rtc->ops) in rtc_set_time()
159 else if (rtc->ops->set_time) in rtc_set_time()
160 err = rtc->ops->set_time(rtc->dev.parent, tm); in rtc_set_time()
161 else if (rtc->ops->set_mmss64) { in rtc_set_time()
164 err = rtc->ops->set_mmss64(rtc->dev.parent, secs64); in rtc_set_time()
165 } else if (rtc->ops->set_mmss) { in rtc_set_time()
167 err = rtc->ops->set_mmss(rtc->dev.parent, secs64); in rtc_set_time()
171 pm_stay_awake(rtc->dev.parent); in rtc_set_time()
172 mutex_unlock(&rtc->ops_lock); in rtc_set_time()
174 schedule_work(&rtc->irqwork); in rtc_set_time()
177 err = rtc_update_irq_enable(rtc, 1); in rtc_set_time()
187 static int rtc_read_alarm_internal(struct rtc_device *rtc, struct rtc_wkalrm *alarm) in rtc_read_alarm_internal() argument
191 err = mutex_lock_interruptible(&rtc->ops_lock); in rtc_read_alarm_internal()
195 if (rtc->ops == NULL) in rtc_read_alarm_internal()
197 else if (!rtc->ops->read_alarm) in rtc_read_alarm_internal()
211 err = rtc->ops->read_alarm(rtc->dev.parent, alarm); in rtc_read_alarm_internal()
214 mutex_unlock(&rtc->ops_lock); in rtc_read_alarm_internal()
220 int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) in __rtc_read_alarm() argument
229 /* The lower level RTC driver may return -1 in some fields, in __rtc_read_alarm()
242 * a current RTC timestamp for any missing (-1) values. The in __rtc_read_alarm()
243 * RTC driver prevents "periodic alarm" modes. in __rtc_read_alarm()
245 * But this can be racey, because some fields of the RTC timestamp in __rtc_read_alarm()
246 * may have wrapped in the interval since we read the RTC alarm, in __rtc_read_alarm()
253 * So, we must first read the RTC timestamp, in __rtc_read_alarm()
254 * then read the RTC alarm value, in __rtc_read_alarm()
255 * and then read a second RTC timestamp. in __rtc_read_alarm()
266 * but since more than one lower level RTC implementation needs it, in __rtc_read_alarm()
271 err = rtc_read_time(rtc, &before); in __rtc_read_alarm()
279 /* get the RTC alarm values, which may be incomplete */ in __rtc_read_alarm()
280 err = rtc_read_alarm_internal(rtc, alarm); in __rtc_read_alarm()
286 rtc_add_offset(rtc, &alarm->time); in __rtc_read_alarm()
291 err = rtc_read_time(rtc, &now); in __rtc_read_alarm()
348 dev_dbg(&rtc->dev, "alarm rollover: %s\n", "day"); in __rtc_read_alarm()
359 dev_dbg(&rtc->dev, "alarm rollover: %s\n", "month"); in __rtc_read_alarm()
374 dev_dbg(&rtc->dev, "alarm rollover: %s\n", "year"); in __rtc_read_alarm()
382 dev_warn(&rtc->dev, "alarm rollover not handled\n"); in __rtc_read_alarm()
389 dev_warn(&rtc->dev, "invalid alarm value: %d-%d-%d %d:%d:%d\n", in __rtc_read_alarm()
398 int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) in rtc_read_alarm() argument
402 err = mutex_lock_interruptible(&rtc->ops_lock); in rtc_read_alarm()
405 if (rtc->ops == NULL) in rtc_read_alarm()
407 else if (!rtc->ops->read_alarm) in rtc_read_alarm()
411 alarm->enabled = rtc->aie_timer.enabled; in rtc_read_alarm()
412 alarm->time = rtc_ktime_to_tm(rtc->aie_timer.node.expires); in rtc_read_alarm()
414 mutex_unlock(&rtc->ops_lock); in rtc_read_alarm()
421 static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) in __rtc_set_alarm() argument
434 err = __rtc_read_time(rtc, &tm); in __rtc_set_alarm()
447 rtc_subtract_offset(rtc, &alarm->time); in __rtc_set_alarm()
449 if (!rtc->ops) in __rtc_set_alarm()
451 else if (!rtc->ops->set_alarm) in __rtc_set_alarm()
454 err = rtc->ops->set_alarm(rtc->dev.parent, alarm); in __rtc_set_alarm()
460 int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) in rtc_set_alarm() argument
464 if (!rtc->ops) in rtc_set_alarm()
466 else if (!rtc->ops->set_alarm) in rtc_set_alarm()
473 err = rtc_valid_range(rtc, &alarm->time); in rtc_set_alarm()
477 err = mutex_lock_interruptible(&rtc->ops_lock); in rtc_set_alarm()
480 if (rtc->aie_timer.enabled) in rtc_set_alarm()
481 rtc_timer_remove(rtc, &rtc->aie_timer); in rtc_set_alarm()
483 rtc->aie_timer.node.expires = rtc_tm_to_ktime(alarm->time); in rtc_set_alarm()
484 rtc->aie_timer.period = 0; in rtc_set_alarm()
486 err = rtc_timer_enqueue(rtc, &rtc->aie_timer); in rtc_set_alarm()
488 mutex_unlock(&rtc->ops_lock); in rtc_set_alarm()
495 int rtc_initialize_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) in rtc_initialize_alarm() argument
504 err = rtc_read_time(rtc, &now); in rtc_initialize_alarm()
508 err = mutex_lock_interruptible(&rtc->ops_lock); in rtc_initialize_alarm()
512 rtc->aie_timer.node.expires = rtc_tm_to_ktime(alarm->time); in rtc_initialize_alarm()
513 rtc->aie_timer.period = 0; in rtc_initialize_alarm()
517 rtc->aie_timer.node.expires)) { in rtc_initialize_alarm()
519 rtc->aie_timer.enabled = 1; in rtc_initialize_alarm()
520 timerqueue_add(&rtc->timerqueue, &rtc->aie_timer.node); in rtc_initialize_alarm()
521 trace_rtc_timer_enqueue(&rtc->aie_timer); in rtc_initialize_alarm()
523 mutex_unlock(&rtc->ops_lock); in rtc_initialize_alarm()
528 int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled) in rtc_alarm_irq_enable() argument
530 int err = mutex_lock_interruptible(&rtc->ops_lock); in rtc_alarm_irq_enable()
534 if (rtc->aie_timer.enabled != enabled) { in rtc_alarm_irq_enable()
536 err = rtc_timer_enqueue(rtc, &rtc->aie_timer); in rtc_alarm_irq_enable()
538 rtc_timer_remove(rtc, &rtc->aie_timer); in rtc_alarm_irq_enable()
543 else if (!rtc->ops) in rtc_alarm_irq_enable()
545 else if (!rtc->ops->alarm_irq_enable) in rtc_alarm_irq_enable()
548 err = rtc->ops->alarm_irq_enable(rtc->dev.parent, enabled); in rtc_alarm_irq_enable()
550 mutex_unlock(&rtc->ops_lock); in rtc_alarm_irq_enable()
557 int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled) in rtc_update_irq_enable() argument
559 int err = mutex_lock_interruptible(&rtc->ops_lock); in rtc_update_irq_enable()
564 if (enabled == 0 && rtc->uie_irq_active) { in rtc_update_irq_enable()
565 mutex_unlock(&rtc->ops_lock); in rtc_update_irq_enable()
566 return rtc_dev_update_irq_enable_emul(rtc, 0); in rtc_update_irq_enable()
570 if (rtc->uie_rtctimer.enabled == enabled) in rtc_update_irq_enable()
573 if (rtc->uie_unsupported) { in rtc_update_irq_enable()
582 __rtc_read_time(rtc, &tm); in rtc_update_irq_enable()
585 rtc->uie_rtctimer.node.expires = ktime_add(now, onesec); in rtc_update_irq_enable()
586 rtc->uie_rtctimer.period = ktime_set(1, 0); in rtc_update_irq_enable()
587 err = rtc_timer_enqueue(rtc, &rtc->uie_rtctimer); in rtc_update_irq_enable()
589 rtc_timer_remove(rtc, &rtc->uie_rtctimer); in rtc_update_irq_enable()
592 mutex_unlock(&rtc->ops_lock); in rtc_update_irq_enable()
601 err = rtc_dev_update_irq_enable_emul(rtc, enabled); in rtc_update_irq_enable()
611 * @rtc: pointer to the rtc device
618 void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode) in rtc_handle_legacy_irq() argument
623 spin_lock_irqsave(&rtc->irq_lock, flags); in rtc_handle_legacy_irq()
624 rtc->irq_data = (rtc->irq_data + (num << 8)) | (RTC_IRQF|mode); in rtc_handle_legacy_irq()
625 spin_unlock_irqrestore(&rtc->irq_lock, flags); in rtc_handle_legacy_irq()
627 wake_up_interruptible(&rtc->irq_queue); in rtc_handle_legacy_irq()
628 kill_fasync(&rtc->async_queue, SIGIO, POLL_IN); in rtc_handle_legacy_irq()
640 struct rtc_device *rtc = (struct rtc_device *)private; in rtc_aie_update_irq() local
641 rtc_handle_legacy_irq(rtc, 1, RTC_AF); in rtc_aie_update_irq()
653 struct rtc_device *rtc = (struct rtc_device *)private; in rtc_uie_update_irq() local
654 rtc_handle_legacy_irq(rtc, 1, RTC_UF); in rtc_uie_update_irq()
668 struct rtc_device *rtc; in rtc_pie_update_irq() local
671 rtc = container_of(timer, struct rtc_device, pie_timer); in rtc_pie_update_irq()
673 period = NSEC_PER_SEC / rtc->irq_freq; in rtc_pie_update_irq()
676 rtc_handle_legacy_irq(rtc, count, RTC_PF); in rtc_pie_update_irq()
682 * rtc_update_irq - Triggered when a RTC interrupt occurs.
683 * @rtc: the rtc device
688 void rtc_update_irq(struct rtc_device *rtc, in rtc_update_irq() argument
691 if (IS_ERR_OR_NULL(rtc)) in rtc_update_irq()
694 pm_stay_awake(rtc->dev.parent); in rtc_update_irq()
695 schedule_work(&rtc->irqwork); in rtc_update_irq()
711 struct rtc_device *rtc = NULL; in rtc_class_open() local
715 rtc = to_rtc_device(dev); in rtc_class_open()
717 if (rtc) { in rtc_class_open()
718 if (!try_module_get(rtc->owner)) { in rtc_class_open()
720 rtc = NULL; in rtc_class_open()
724 return rtc; in rtc_class_open()
728 void rtc_class_close(struct rtc_device *rtc) in rtc_class_close() argument
730 module_put(rtc->owner); in rtc_class_close()
731 put_device(&rtc->dev); in rtc_class_close()
735 static int rtc_update_hrtimer(struct rtc_device *rtc, int enabled) in rtc_update_hrtimer() argument
744 * could be blocked on rtc->irq_task_lock and hrtimer_cancel() in rtc_update_hrtimer()
747 if (hrtimer_try_to_cancel(&rtc->pie_timer) < 0) in rtc_update_hrtimer()
751 ktime_t period = NSEC_PER_SEC / rtc->irq_freq; in rtc_update_hrtimer()
753 hrtimer_start(&rtc->pie_timer, period, HRTIMER_MODE_REL); in rtc_update_hrtimer()
760 * @rtc: the rtc device
768 int rtc_irq_set_state(struct rtc_device *rtc, int enabled) in rtc_irq_set_state() argument
772 while (rtc_update_hrtimer(rtc, enabled) < 0) in rtc_irq_set_state()
775 rtc->pie_enabled = enabled; in rtc_irq_set_state()
783 * @rtc: the rtc device
791 int rtc_irq_set_freq(struct rtc_device *rtc, int freq) in rtc_irq_set_freq() argument
798 rtc->irq_freq = freq; in rtc_irq_set_freq()
799 while (rtc->pie_enabled && rtc_update_hrtimer(rtc, 1) < 0) in rtc_irq_set_freq()
808 * @rtc rtc device
811 * Enqueues a timer onto the rtc devices timerqueue and sets
818 static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer) in rtc_timer_enqueue() argument
820 struct timerqueue_node *next = timerqueue_getnext(&rtc->timerqueue); in rtc_timer_enqueue()
825 __rtc_read_time(rtc, &tm); in rtc_timer_enqueue()
835 timerqueue_add(&rtc->timerqueue, &timer->node); in rtc_timer_enqueue()
842 err = __rtc_set_alarm(rtc, &alarm); in rtc_timer_enqueue()
844 pm_stay_awake(rtc->dev.parent); in rtc_timer_enqueue()
845 schedule_work(&rtc->irqwork); in rtc_timer_enqueue()
847 timerqueue_del(&rtc->timerqueue, &timer->node); in rtc_timer_enqueue()
856 static void rtc_alarm_disable(struct rtc_device *rtc) in rtc_alarm_disable() argument
858 if (!rtc->ops || !rtc->ops->alarm_irq_enable) in rtc_alarm_disable()
861 rtc->ops->alarm_irq_enable(rtc->dev.parent, false); in rtc_alarm_disable()
867 * @rtc rtc device
870 * Removes a timer onto the rtc devices timerqueue and sets
877 static void rtc_timer_remove(struct rtc_device *rtc, struct rtc_timer *timer) in rtc_timer_remove() argument
879 struct timerqueue_node *next = timerqueue_getnext(&rtc->timerqueue); in rtc_timer_remove()
880 timerqueue_del(&rtc->timerqueue, &timer->node); in rtc_timer_remove()
886 next = timerqueue_getnext(&rtc->timerqueue); in rtc_timer_remove()
888 rtc_alarm_disable(rtc); in rtc_timer_remove()
893 err = __rtc_set_alarm(rtc, &alarm); in rtc_timer_remove()
895 pm_stay_awake(rtc->dev.parent); in rtc_timer_remove()
896 schedule_work(&rtc->irqwork); in rtc_timer_remove()
902 * rtc_timer_do_work - Expires rtc timers
903 * @rtc rtc device
906 * Expires rtc timers. Reprograms next alarm event if needed.
918 struct rtc_device *rtc = in rtc_timer_do_work() local
921 mutex_lock(&rtc->ops_lock); in rtc_timer_do_work()
923 __rtc_read_time(rtc, &tm); in rtc_timer_do_work()
925 while ((next = timerqueue_getnext(&rtc->timerqueue))) { in rtc_timer_do_work()
931 timerqueue_del(&rtc->timerqueue, &timer->node); in rtc_timer_do_work()
943 timerqueue_add(&rtc->timerqueue, &timer->node); in rtc_timer_do_work()
957 err = __rtc_set_alarm(rtc, &alarm); in rtc_timer_do_work()
965 timerqueue_del(&rtc->timerqueue, &timer->node); in rtc_timer_do_work()
968 dev_err(&rtc->dev, "__rtc_set_alarm: err=%d\n", err); in rtc_timer_do_work()
972 rtc_alarm_disable(rtc); in rtc_timer_do_work()
974 pm_relax(rtc->dev.parent); in rtc_timer_do_work()
975 mutex_unlock(&rtc->ops_lock); in rtc_timer_do_work()
995 * @ rtc: rtc device to be used
1002 int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer *timer, in rtc_timer_start() argument
1006 mutex_lock(&rtc->ops_lock); in rtc_timer_start()
1008 rtc_timer_remove(rtc, timer); in rtc_timer_start()
1013 ret = rtc_timer_enqueue(rtc, timer); in rtc_timer_start()
1015 mutex_unlock(&rtc->ops_lock); in rtc_timer_start()
1020 * @ rtc: rtc device to be used
1025 void rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer *timer) in rtc_timer_cancel() argument
1027 mutex_lock(&rtc->ops_lock); in rtc_timer_cancel()
1029 rtc_timer_remove(rtc, timer); in rtc_timer_cancel()
1030 mutex_unlock(&rtc->ops_lock); in rtc_timer_cancel()
1034 * rtc_read_offset - Read the amount of rtc offset in parts per billion
1035 * @ rtc: rtc device to be used
1040 * Kernel interface to read rtc clock offset
1042 * If read_offset() is not implemented for the rtc, return -EINVAL
1044 int rtc_read_offset(struct rtc_device *rtc, long *offset) in rtc_read_offset() argument
1048 if (!rtc->ops) in rtc_read_offset()
1051 if (!rtc->ops->read_offset) in rtc_read_offset()
1054 mutex_lock(&rtc->ops_lock); in rtc_read_offset()
1055 ret = rtc->ops->read_offset(rtc->dev.parent, offset); in rtc_read_offset()
1056 mutex_unlock(&rtc->ops_lock); in rtc_read_offset()
1064 * @ rtc: rtc device to be used
1067 * Some rtc's allow an adjustment to the average duration of a second
1073 * where t0 is the measured length of 1 RTC second with offset = 0
1075 * Kernel interface to adjust an rtc clock offset.
1077 * If the rtc offset is not setable (or not implemented), return -EINVAL
1079 int rtc_set_offset(struct rtc_device *rtc, long offset) in rtc_set_offset() argument
1083 if (!rtc->ops) in rtc_set_offset()
1086 if (!rtc->ops->set_offset) in rtc_set_offset()
1089 mutex_lock(&rtc->ops_lock); in rtc_set_offset()
1090 ret = rtc->ops->set_offset(rtc->dev.parent, offset); in rtc_set_offset()
1091 mutex_unlock(&rtc->ops_lock); in rtc_set_offset()