diff options
Diffstat (limited to 'drivers/rtc/interface.c')
| -rw-r--r-- | drivers/rtc/interface.c | 44 |
1 files changed, 42 insertions, 2 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index 1906f4884a83..96626f8068f9 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -384,6 +384,46 @@ done: return err; } +/** + * rtc_read_next_alarm - read the next expiring alarm + * @rtc: RTC device + * @alarm: storage for the alarm information + * + * Read the next expiring alarm from the RTC timerqueue. This returns + * the alarm that will actually fire next, which may be different from + * rtc_read_alarm() if multiple timers are queued (e.g., alarmtimer + * and wakealarm sysfs both active). + * + * Returns: 0 on success, -ENOENT if no alarm is pending, or other error. + */ +int rtc_read_next_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) +{ + struct timerqueue_node *next; + int err; + + if (!rtc || !alarm) + return -EINVAL; + + err = mutex_lock_interruptible(&rtc->ops_lock); + if (err) + return err; + + next = timerqueue_getnext(&rtc->timerqueue); + if (!next) { + err = -ENOENT; + goto unlock; + } + + memset(alarm, 0, sizeof(struct rtc_wkalrm)); + alarm->time = rtc_ktime_to_tm(next->expires); + alarm->enabled = 1; + +unlock: + mutex_unlock(&rtc->ops_lock); + return err; +} +EXPORT_SYMBOL_GPL(rtc_read_next_alarm); + int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) { int err; @@ -635,8 +675,8 @@ EXPORT_SYMBOL_GPL(rtc_update_irq_enable); /** * rtc_handle_legacy_irq - AIE, UIE and PIE event hook * @rtc: pointer to the rtc device - * @num: number of occurence of the event - * @mode: type of the event, RTC_AF, RTC_UF of RTC_PF + * @num: number of occurrence of the event + * @mode: type of the event, RTC_AF, RTC_UF or RTC_PF * * This function is called when an AIE, UIE or PIE mode interrupt * has occurred (or been emulated). |