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