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alarmtimer: Implement remaining callback

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Preparatory change to utilize the common posix timer mechanisms.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20170530211657.592676753@linutronix.de
This commit is contained in:
Thomas Gleixner 2017-05-30 23:15:56 +02:00
parent e7561f1633
commit d653d8457c
1 changed files with 22 additions and 9 deletions
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31
kernel/time/alarmtimer.c
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@ -560,6 +560,18 @@ static int alarm_timer_forward(struct k_itimer *timr, ktime_t now)
return (int) alarm_forward(alarm, timr->it_interval, now); return (int) alarm_forward(alarm, timr->it_interval, now);
} }
/**
* alarm_timer_remaining - Posix timer callback to retrieve remaining time
* @timr: Pointer to the posixtimer data struct
* @now: Current time to calculate against
*/
static ktime_t alarm_timer_remaining(struct k_itimer *timr, ktime_t now)
{
struct alarm *alarm = &timr->it.alarm.alarmtimer;
return ktime_sub(now, alarm->node.expires);
}
/** /**
* alarm_clock_getres - posix getres interface * alarm_clock_getres - posix getres interface
* @which_clock: clockid * @which_clock: clockid
@ -881,15 +893,16 @@ out:
} }
const struct k_clock alarm_clock = { const struct k_clock alarm_clock = {
.clock_getres = alarm_clock_getres, .clock_getres = alarm_clock_getres,
.clock_get = alarm_clock_get, .clock_get = alarm_clock_get,
.timer_create = alarm_timer_create, .timer_create = alarm_timer_create,
.timer_set = alarm_timer_set, .timer_set = alarm_timer_set,
.timer_del = alarm_timer_del, .timer_del = alarm_timer_del,
.timer_get = alarm_timer_get, .timer_get = alarm_timer_get,
.timer_rearm = alarm_timer_rearm, .timer_rearm = alarm_timer_rearm,
.timer_forward = alarm_timer_forward, .timer_forward = alarm_timer_forward,
.nsleep = alarm_timer_nsleep, .timer_remaining = alarm_timer_remaining,
.nsleep = alarm_timer_nsleep,
}; };
#endif /* CONFIG_POSIX_TIMERS */ #endif /* CONFIG_POSIX_TIMERS */