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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_ALARMTIMER_H #define _LINUX_ALARMTIMER_H #include <linux/time.h> #include <linux/hrtimer.h> #include <linux/timerqueue.h> struct rtc_device; enum alarmtimer_type { ALARM_REALTIME, ALARM_BOOTTIME, /* Supported types end here */ ALARM_NUMTYPE, /* Used for tracing information. No usable types. */ ALARM_REALTIME_FREEZER, ALARM_BOOTTIME_FREEZER, }; enum alarmtimer_restart { ALARMTIMER_NORESTART, ALARMTIMER_RESTART, }; #define ALARMTIMER_STATE_INACTIVE 0x00 #define ALARMTIMER_STATE_ENQUEUED 0x01 /** * struct alarm - Alarm timer structure * @node: timerqueue node for adding to the event list this value * also includes the expiration time. * @timer: hrtimer used to schedule events while running * @function: Function pointer to be executed when the timer fires. * @type: Alarm type (BOOTTIME/REALTIME). * @state: Flag that represents if the alarm is set to fire or not. * @data: Internal data value. */ struct alarm { struct timerqueue_node node; struct hrtimer timer; enum alarmtimer_restart (*function)(struct alarm *, ktime_t now); enum alarmtimer_type type; int state; void *data; }; void alarm_init(struct alarm *alarm, enum alarmtimer_type type, enum alarmtimer_restart (*function)(struct alarm *, ktime_t)); void alarm_start(struct alarm *alarm, ktime_t start); void alarm_start_relative(struct alarm *alarm, ktime_t start); void alarm_restart(struct alarm *alarm); int alarm_try_to_cancel(struct alarm *alarm); int alarm_cancel(struct alarm *alarm); u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval); u64 alarm_forward_now(struct alarm *alarm, ktime_t interval); ktime_t alarm_expires_remaining(const struct alarm *alarm); /* Provide way to access the rtc device being used by alarmtimers */ struct rtc_device *alarmtimer_get_rtcdev(void); #endif