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TOMOYO Linux Cross Reference
Linux/include/linux/alarmtimer.h

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  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
 65 

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