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rtc: alarm: Add in-kernel alarm interface

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Drivers can now create alarms that will use an hrtimer while the
system is running and the rtc to wake up from suspend.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Arve Hjønnevåg
2009-05-04 14:09:15 -07:00
committed by Stephen Boyd
parent dcb77e20ae
commit cb40a6a8cb
5 changed files with 1028 additions and 0 deletions
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107
include/linux/android_alarm.h Normal file
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/* include/linux/android_alarm.h
*
* Copyright (C) 2006-2007 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef _LINUX_ANDROID_ALARM_H
#define _LINUX_ANDROID_ALARM_H
#include <linux/ioctl.h>
#include <linux/time.h>
enum android_alarm_type {
/* return code bit numbers or set alarm arg */
ANDROID_ALARM_RTC_WAKEUP,
ANDROID_ALARM_RTC,
ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP,
ANDROID_ALARM_ELAPSED_REALTIME,
ANDROID_ALARM_SYSTEMTIME,
ANDROID_ALARM_TYPE_COUNT,
/* return code bit numbers */
/* ANDROID_ALARM_TIME_CHANGE = 16 */
};
#ifdef __KERNEL__
#include <linux/ktime.h>
#include <linux/rbtree.h>
/*
* The alarm interface is similar to the hrtimer interface but adds support
* for wakeup from suspend. It also adds an elapsed realtime clock that can
* be used for periodic timers that need to keep runing while the system is
* suspended and not be disrupted when the wall time is set.
*/
/**
* struct alarm - the basic alarm structure
* @node: red black tree node for time ordered insertion
* @type: alarm type. rtc/elapsed-realtime/systemtime, wakeup/non-wakeup.
* @softexpires: the absolute earliest expiry time of the alarm.
* @expires: the absolute expiry time.
* @function: alarm expiry callback function
*
* The alarm structure must be initialized by alarm_init()
*
*/
struct alarm {
struct rb_node node;
enum android_alarm_type type;
ktime_t softexpires;
ktime_t expires;
void (*function)(struct alarm *);
};
void alarm_init(struct alarm *alarm,
enum android_alarm_type type, void (*function)(struct alarm *));
void alarm_start_range(struct alarm *alarm, ktime_t start, ktime_t end);
int alarm_try_to_cancel(struct alarm *alarm);
int alarm_cancel(struct alarm *alarm);
ktime_t alarm_get_elapsed_realtime(void);
/* set rtc while preserving elapsed realtime */
int alarm_set_rtc(const struct timespec ts);
void alarm_update_timedelta(struct timespec tv, struct timespec ts);
#endif
enum android_alarm_return_flags {
ANDROID_ALARM_RTC_WAKEUP_MASK = 1U << ANDROID_ALARM_RTC_WAKEUP,
ANDROID_ALARM_RTC_MASK = 1U << ANDROID_ALARM_RTC,
ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK =
1U << ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP,
ANDROID_ALARM_ELAPSED_REALTIME_MASK =
1U << ANDROID_ALARM_ELAPSED_REALTIME,
ANDROID_ALARM_SYSTEMTIME_MASK = 1U << ANDROID_ALARM_SYSTEMTIME,
ANDROID_ALARM_TIME_CHANGE_MASK = 1U << 16
};
/* Disable alarm */
#define ANDROID_ALARM_CLEAR(type) _IO('a', 0 | ((type) << 4))
/* Ack last alarm and wait for next */
#define ANDROID_ALARM_WAIT _IO('a', 1)
#define ALARM_IOW(c, type, size) _IOW('a', (c) | ((type) << 4), size)
/* Set alarm */
#define ANDROID_ALARM_SET(type) ALARM_IOW(2, type, struct timespec)
#define ANDROID_ALARM_SET_AND_WAIT(type) ALARM_IOW(3, type, struct timespec)
#define ANDROID_ALARM_GET_TIME(type) ALARM_IOW(4, type, struct timespec)
#define ANDROID_ALARM_SET_RTC _IOW('a', 5, struct timespec)
#define ANDROID_ALARM_BASE_CMD(cmd) (cmd & ~(_IOC(0, 0, 0xf0, 0)))
#define ANDROID_ALARM_IOCTL_TO_TYPE(cmd) (_IOC_NR(cmd) >> 4)
#endif