int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm)
{
int err;
err = rtc_valid_tm(tm);
if (err != 0)
return err;
err = rtc_valid_range(rtc, tm);
if (err)
return err;
rtc_subtract_offset(rtc, tm);
err = mutex_lock_interruptible(&rtc->ops_lock);
if (err)
return err;
if (!rtc->ops)
err = -ENODEV;
else if (rtc->ops->set_time)
err = rtc->ops->set_time(rtc->dev.parent, tm);
else
err = -EINVAL;
pm_stay_awake(rtc->dev.parent);
mutex_unlock(&rtc->ops_lock);
/* A timer might have just expired */
schedule_work(&rtc->irqwork);
trace_rtc_set_time(rtc_tm_to_time64(tm), err);
return err;
}
static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
{
struct rtc_time tm;
time64_t now, scheduled;
int err;
err = rtc_valid_tm(&alarm->time);
if (err)
return err;
scheduled = rtc_tm_to_time64(&alarm->time);
/* Make sure we're not setting alarms in the past */
err = __rtc_read_time(rtc, &tm);
if (err)
return err;
now = rtc_tm_to_time64(&tm);
if (scheduled <= now)
return -ETIME;
/*
* XXX - We just checked to make sure the alarm time is not
* in the past, but there is still a race window where if
* the is alarm set for the next second and the second ticks
* over right here, before we set the alarm.
*/
rtc_subtract_offset(rtc, &alarm->time);
if (!rtc->ops)
err = -ENODEV;
else if (!rtc->ops->set_alarm)
err = -EINVAL;
else
err = rtc->ops->set_alarm(rtc->dev.parent, alarm);
trace_rtc_set_alarm(rtc_tm_to_time64(&alarm->time), err);
return err;
}
