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 9enum alarmtimer_type { 10 ALARM_REALTIME, 11 ALARM_BOOTTIME, 12 13 ALARM_NUMTYPE, 14}; 15 16enum 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 */ 35struct 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 44void alarm_init(struct alarm *alarm, enum alarmtimer_type type, 45 enum alarmtimer_restart (*function)(struct alarm *, ktime_t)); 46void alarm_start(struct alarm *alarm, ktime_t start); 47void alarm_start_relative(struct alarm *alarm, ktime_t start); 48void alarm_restart(struct alarm *alarm); 49int alarm_try_to_cancel(struct alarm *alarm); 50int alarm_cancel(struct alarm *alarm); 51 52u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval); 53u64 alarm_forward_now(struct alarm *alarm, ktime_t interval); 54ktime_t alarm_expires_remaining(const struct alarm *alarm); 55 56/* Provide way to access the rtc device being used by alarmtimers */ 57struct rtc_device *alarmtimer_get_rtcdev(void); 58 59#endif 60