include/linux/alarmtimer.h

   1 #ifndef _LINUX_ALARMTIMER_H
   2 #define _LINUX_ALARMTIMER_H
   3
   4 #include <linux/time.h>
   5 #include <linux/hrtimer.h>
   6 #include <linux/timerqueue.h>
   7 #include <linux/rtc.h>
   8
   9 enum alarmtimer_type {
  10         ALARM_REALTIME,
  11         ALARM_BOOTTIME,
  12
  13         ALARM_NUMTYPE,
  14 };
  15
  16 enum alarmtimer_restart {
  17         ALARMTIMER_NORESTART,
  18         ALARMTIMER_RESTART,
  19 };
  20
  21
  22 #define ALARMTIMER_STATE_INACTIVE       0x00
  23 #define ALARMTIMER_STATE_ENQUEUED       0x01
  24
  25 /**
  26  * struct alarm - Alarm timer structure
  27  * @node:       timerqueue node for adding to the event list this value
  28  *              also includes the expiration time.
  29  * @period:     Period for recuring alarms
  30  * @function:   Function pointer to be executed when the timer fires.
  31  * @type:       Alarm type (BOOTTIME/REALTIME)
  32  * @enabled:    Flag that represents if the alarm is set to fire or not
  33  * @data:       Internal data value.
  34  */
  35 struct alarm {
  36         struct timerqueue_node  node;
  37         struct hrtimer          timer;
  38         enum alarmtimer_restart (*function)(struct alarm *, ktime_t now);
  39         enum alarmtimer_type    type;
  40         int                     state;
  41         void                    *data;
  42 };
  43
  44 void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
  45                 enum alarmtimer_restart (*function)(struct alarm *, ktime_t));
  46 int alarm_start(struct alarm *alarm, ktime_t start);
  47 int alarm_start_relative(struct alarm *alarm, ktime_t start);
  48 void alarm_restart(struct alarm *alarm);
  49 int alarm_try_to_cancel(struct alarm *alarm);
  50 int alarm_cancel(struct alarm *alarm);
  51
  52 u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval);
  53 u64 alarm_forward_now(struct alarm *alarm, ktime_t interval);
  54 ktime_t alarm_expires_remaining(const struct alarm *alarm);
  55
  56 /* Provide way to access the rtc device being used by alarmtimers */
  57 struct rtc_device *alarmtimer_get_rtcdev(void);
  58
  59 #endif