alarmtimer: Add functions for timerfd support

[pandora-kernel.git] / kernel / time / alarmtimer.c

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index f11d83b..3e5cba2 100644 (file)
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -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
@@ -305,7 +311,7 @@ void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
 }
 
 /**
- * alarm_start - Sets an alarm to fire
+ * alarm_start - Sets an absolute alarm to fire
  * @alarm: ptr to alarm to set
  * @start: time to run the alarm
  */
@@ -324,6 +330,31 @@ int alarm_start(struct alarm *alarm, ktime_t start)
        return ret;
 }
 
+/**
+ * alarm_start_relative - Sets a relative alarm to fire
+ * @alarm: ptr to alarm to set
+ * @start: time relative to now to run the alarm
+ */
+int alarm_start_relative(struct alarm *alarm, ktime_t start)
+{
+       struct alarm_base *base = &alarm_bases[alarm->type];
+
+       start = ktime_add(start, base->gettime());
+       return alarm_start(alarm, start);
+}
+
+void alarm_restart(struct alarm *alarm)
+{
+       struct alarm_base *base = &alarm_bases[alarm->type];
+       unsigned long flags;
+
+       spin_lock_irqsave(&base->lock, flags);
+       hrtimer_set_expires(&alarm->timer, alarm->node.expires);
+       hrtimer_restart(&alarm->timer);
+       alarmtimer_enqueue(base, alarm);
+       spin_unlock_irqrestore(&base->lock, flags);
+}
+
 /**
  * alarm_try_to_cancel - Tries to cancel an alarm timer
  * @alarm: ptr to alarm to be canceled
@@ -394,6 +425,12 @@ u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval)
        return overrun;
 }
 
+u64 alarm_forward_now(struct alarm *alarm, ktime_t interval)
+{
+       struct alarm_base *base = &alarm_bases[alarm->type];
+
+       return alarm_forward(alarm, base->gettime(), interval);
+}