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         /* Supported types end here */
  14         ALARM_NUMTYPE,
  15
  16         /* Used for tracing information. No usable types. */
  17         ALARM_REALTIME_FREEZER,
  18         ALARM_BOOTTIME_FREEZER,
  19 };
  20
  21 enum alarmtimer_restart {
  22         ALARMTIMER_NORESTART,
  23         ALARMTIMER_RESTART,
  24 };
  25
  26
  27 #define ALARMTIMER_STATE_INACTIVE       0x00
  28 #define ALARMTIMER_STATE_ENQUEUED       0x01
  29
  30 /**
  31  * struct alarm - Alarm timer structure
  32  * @node:       timerqueue node for adding to the event list this value
  33  *              also includes the expiration time.
  34  * @timer:      hrtimer used to schedule events while running
  35  * @function:   Function pointer to be executed when the timer fires.
  36  * @type:       Alarm type (BOOTTIME/REALTIME).
  37  * @state:      Flag that represents if the alarm is set to fire or not.
  38  * @data:       Internal data value.
  39  */
  40 struct alarm {
  41         struct timerqueue_node  node;
  42         struct hrtimer          timer;
  43         enum alarmtimer_restart (*function)(struct alarm *, ktime_t now);
  44         enum alarmtimer_type    type;
  45         int                     state;
  46         void                    *data;
  47 };
  48
  49 void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
  50                 enum alarmtimer_restart (*function)(struct alarm *, ktime_t));
  51 void alarm_start(struct alarm *alarm, ktime_t start);
  52 void alarm_start_relative(struct alarm *alarm, ktime_t start);
  53 void alarm_restart(struct alarm *alarm);
  54 int alarm_try_to_cancel(struct alarm *alarm);
  55 int alarm_cancel(struct alarm *alarm);
  56
  57 u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval);
  58 u64 alarm_forward_now(struct alarm *alarm, ktime_t interval);
  59 ktime_t alarm_expires_remaining(const struct alarm *alarm);
  60
  61 /* Provide way to access the rtc device being used by alarmtimers */
  62 struct rtc_device *alarmtimer_get_rtcdev(void);
  63
  64 #endif