108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
/* include/linux/android_alarm.h
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*
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* Copyright (C) 2006-2007 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef _LINUX_ANDROID_ALARM_H
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#define _LINUX_ANDROID_ALARM_H
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#include <linux/ioctl.h>
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#include <linux/time.h>
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enum android_alarm_type {
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/* return code bit numbers or set alarm arg */
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ANDROID_ALARM_RTC_WAKEUP,
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ANDROID_ALARM_RTC,
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ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP,
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ANDROID_ALARM_ELAPSED_REALTIME,
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ANDROID_ALARM_SYSTEMTIME,
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ANDROID_ALARM_TYPE_COUNT,
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/* return code bit numbers */
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/* ANDROID_ALARM_TIME_CHANGE = 16 */
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};
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#ifdef __KERNEL__
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#include <linux/ktime.h>
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#include <linux/rbtree.h>
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/*
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* The alarm interface is similar to the hrtimer interface but adds support
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* for wakeup from suspend. It also adds an elapsed realtime clock that can
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* be used for periodic timers that need to keep runing while the system is
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* suspended and not be disrupted when the wall time is set.
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*/
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/**
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* struct alarm - the basic alarm structure
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* @node: red black tree node for time ordered insertion
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* @type: alarm type. rtc/elapsed-realtime/systemtime, wakeup/non-wakeup.
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* @softexpires: the absolute earliest expiry time of the alarm.
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* @expires: the absolute expiry time.
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* @function: alarm expiry callback function
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*
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* The alarm structure must be initialized by alarm_init()
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*
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*/
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struct alarm {
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struct rb_node node;
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enum android_alarm_type type;
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ktime_t softexpires;
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ktime_t expires;
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void (*function)(struct alarm *);
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};
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void alarm_init(struct alarm *alarm,
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enum android_alarm_type type, void (*function)(struct alarm *));
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void alarm_start_range(struct alarm *alarm, ktime_t start, ktime_t end);
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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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ktime_t alarm_get_elapsed_realtime(void);
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/* set rtc while preserving elapsed realtime */
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int alarm_set_rtc(const struct timespec ts);
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void alarm_update_timedelta(struct timespec tv, struct timespec ts);
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#endif
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enum android_alarm_return_flags {
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ANDROID_ALARM_RTC_WAKEUP_MASK = 1U << ANDROID_ALARM_RTC_WAKEUP,
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ANDROID_ALARM_RTC_MASK = 1U << ANDROID_ALARM_RTC,
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ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK =
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1U << ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP,
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ANDROID_ALARM_ELAPSED_REALTIME_MASK =
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1U << ANDROID_ALARM_ELAPSED_REALTIME,
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ANDROID_ALARM_SYSTEMTIME_MASK = 1U << ANDROID_ALARM_SYSTEMTIME,
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ANDROID_ALARM_TIME_CHANGE_MASK = 1U << 16
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};
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/* Disable alarm */
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#define ANDROID_ALARM_CLEAR(type) _IO('a', 0 | ((type) << 4))
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/* Ack last alarm and wait for next */
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#define ANDROID_ALARM_WAIT _IO('a', 1)
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#define ALARM_IOW(c, type, size) _IOW('a', (c) | ((type) << 4), size)
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/* Set alarm */
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#define ANDROID_ALARM_SET(type) ALARM_IOW(2, type, struct timespec)
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#define ANDROID_ALARM_SET_AND_WAIT(type) ALARM_IOW(3, type, struct timespec)
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#define ANDROID_ALARM_GET_TIME(type) ALARM_IOW(4, type, struct timespec)
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#define ANDROID_ALARM_SET_RTC _IOW('a', 5, struct timespec)
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#define ANDROID_ALARM_BASE_CMD(cmd) (cmd & ~(_IOC(0, 0, 0xf0, 0)))
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#define ANDROID_ALARM_IOCTL_TO_TYPE(cmd) (_IOC_NR(cmd) >> 4)
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#endif
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