| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _LINUX_ALARMTIMER_H |
| 3 | #define _LINUX_ALARMTIMER_H |
| 4 | |
| 5 | #include <linux/time.h> |
| 6 | #include <linux/hrtimer.h> |
| 7 | #include <linux/timerqueue.h> |
| 8 | |
| 9 | struct rtc_device; |
| 10 | |
| 11 | enum alarmtimer_type { |
| 12 | ALARM_REALTIME, |
| 13 | ALARM_BOOTTIME, |
| 14 | |
| 15 | /* Supported types end here */ |
| 16 | ALARM_NUMTYPE, |
| 17 | |
| 18 | /* Used for tracing information. No usable types. */ |
| 19 | ALARM_REALTIME_FREEZER, |
| 20 | ALARM_BOOTTIME_FREEZER, |
| 21 | }; |
| 22 | |
| 23 | enum alarmtimer_restart { |
| 24 | ALARMTIMER_NORESTART, |
| 25 | ALARMTIMER_RESTART, |
| 26 | }; |
| 27 | |
| 28 | |
| 29 | #define ALARMTIMER_STATE_INACTIVE 0x00 |
| 30 | #define ALARMTIMER_STATE_ENQUEUED 0x01 |
| 31 | |
| 32 | /** |
| 33 | * struct alarm - Alarm timer structure |
| 34 | * @node: timerqueue node for adding to the event list this value |
| 35 | * also includes the expiration time. |
| 36 | * @timer: hrtimer used to schedule events while running |
| 37 | * @function: Function pointer to be executed when the timer fires. |
| 38 | * @type: Alarm type (BOOTTIME/REALTIME). |
| 39 | * @state: Flag that represents if the alarm is set to fire or not. |
| 40 | * @data: Internal data value. |
| 41 | */ |
| 42 | struct alarm { |
| 43 | struct timerqueue_node node; |
| 44 | struct hrtimer timer; |
| 45 | enum alarmtimer_restart (*function)(struct alarm *, ktime_t now); |
| 46 | enum alarmtimer_type type; |
| 47 | int state; |
| 48 | void *data; |
| 49 | }; |
| 50 | |
| 51 | void alarm_init(struct alarm *alarm, enum alarmtimer_type type, |
| 52 | enum alarmtimer_restart (*function)(struct alarm *, ktime_t)); |
| 53 | void alarm_start(struct alarm *alarm, ktime_t start); |
| 54 | void alarm_start_relative(struct alarm *alarm, ktime_t start); |
| 55 | void alarm_restart(struct alarm *alarm); |
| 56 | int alarm_try_to_cancel(struct alarm *alarm); |
| 57 | int alarm_cancel(struct alarm *alarm); |
| 58 | |
| 59 | u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval); |
| 60 | u64 alarm_forward_now(struct alarm *alarm, ktime_t interval); |
| 61 | ktime_t alarm_expires_remaining(const struct alarm *alarm); |
| 62 | |
| 63 | #ifdef CONFIG_RTC_CLASS |
| 64 | /* Provide way to access the rtc device being used by alarmtimers */ |
| 65 | struct rtc_device *alarmtimer_get_rtcdev(void); |
| 66 | #else |
| 67 | static inline struct rtc_device *alarmtimer_get_rtcdev(void) { return NULL; } |
| 68 | #endif |
| 69 | |
| 70 | #endif |