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alarmtimer: add alarm_expires_remaining

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Similar to hrtimer_expires_remaining, return the amount of time
remaining until alarm expiry.

Change-Id: I8c57512d619ac66bcdaf2d9ccdf0d7f74af2ff66
Signed-off-by: Todd Poynor <toddpoynor@google.com>
This commit is contained in:
Todd Poynor 2013-05-07 20:43:29 -07:00 committed by Arve Hjønnevåg
parent 9231422b0b
commit 7b71ddcebb
2 changed files with 7 additions and 0 deletions
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1
include/linux/alarmtimer.h
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@ -51,6 +51,7 @@ int alarm_cancel(struct alarm *alarm);
u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval);
u64 alarm_forward_now(struct alarm *alarm, ktime_t interval);
ktime_t alarm_expires_remaining(const struct alarm *alarm);
/* Provide way to access the rtc device being used by alarmtimers */
struct rtc_device *alarmtimer_get_rtcdev(void);

6
kernel/time/alarmtimer.c
View File

@ -199,6 +199,12 @@ static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer)
}
ktime_t alarm_expires_remaining(const struct alarm *alarm)
{
struct alarm_base *base = &alarm_bases[alarm->type];
return ktime_sub(alarm->node.expires, base->gettime());
}
#ifdef CONFIG_RTC_CLASS
/**
* alarmtimer_suspend - Suspend time callback