staging: android-alarm: Add android alarm driver & in-kernel alarm interface
Drivers can now create alarms that will use an hrtimer while the system is running and the rtc to wake up from suspend. CC: Arve Hjønnevåg <arve@android.com> CC: Android Kernel Team <kernel-team@android.com> Signed-off-by: Arve Hjønnevåg <arve@android.com> [Fold and move alarm driver and interface to staging, fix whitespace issue, drop kconfig & make file changes as it currently doesn't build -jstultz] Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arve Hjønnevåg
Greg Kroah-Hartman
parent
242501ce5d
commit
841cb11c6f
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@ -0,0 +1,286 @@
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/* drivers/rtc/alarm-dev.c
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*
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* Copyright (C) 2007-2009 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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#include <asm/mach/time.h>
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#include <linux/device.h>
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#include <linux/miscdevice.h>
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#include <linux/fs.h>
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#include <linux/platform_device.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/sysdev.h>
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#include <linux/uaccess.h>
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#include <linux/wakelock.h>
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#include "android_alarm.h"
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#define ANDROID_ALARM_PRINT_INFO (1U << 0)
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#define ANDROID_ALARM_PRINT_IO (1U << 1)
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#define ANDROID_ALARM_PRINT_INT (1U << 2)
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static int debug_mask = ANDROID_ALARM_PRINT_INFO;
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module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
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#define pr_alarm(debug_level_mask, args...) \
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do { \
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if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) { \
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pr_info(args); \
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} \
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} while (0)
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#define ANDROID_ALARM_WAKEUP_MASK ( \
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ANDROID_ALARM_RTC_WAKEUP_MASK | \
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ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
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/* support old usespace code */
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#define ANDROID_ALARM_SET_OLD _IOW('a', 2, time_t) /* set alarm */
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#define ANDROID_ALARM_SET_AND_WAIT_OLD _IOW('a', 3, time_t)
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static int alarm_opened;
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static DEFINE_SPINLOCK(alarm_slock);
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static struct wake_lock alarm_wake_lock;
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static DECLARE_WAIT_QUEUE_HEAD(alarm_wait_queue);
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static uint32_t alarm_pending;
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static uint32_t alarm_enabled;
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static uint32_t wait_pending;
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static struct alarm alarms[ANDROID_ALARM_TYPE_COUNT];
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static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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int rv = 0;
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unsigned long flags;
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struct timespec new_alarm_time;
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struct timespec new_rtc_time;
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struct timespec tmp_time;
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enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd);
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uint32_t alarm_type_mask = 1U << alarm_type;
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if (alarm_type >= ANDROID_ALARM_TYPE_COUNT)
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return -EINVAL;
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if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) {
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if ((file->f_flags & O_ACCMODE) == O_RDONLY)
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return -EPERM;
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if (file->private_data == NULL &&
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cmd != ANDROID_ALARM_SET_RTC) {
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spin_lock_irqsave(&alarm_slock, flags);
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if (alarm_opened) {
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spin_unlock_irqrestore(&alarm_slock, flags);
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return -EBUSY;
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}
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alarm_opened = 1;
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file->private_data = (void *)1;
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spin_unlock_irqrestore(&alarm_slock, flags);
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}
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}
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switch (ANDROID_ALARM_BASE_CMD(cmd)) {
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case ANDROID_ALARM_CLEAR(0):
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spin_lock_irqsave(&alarm_slock, flags);
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pr_alarm(IO, "alarm %d clear\n", alarm_type);
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alarm_try_to_cancel(&alarms[alarm_type]);
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if (alarm_pending) {
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alarm_pending &= ~alarm_type_mask;
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if (!alarm_pending && !wait_pending)
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wake_unlock(&alarm_wake_lock);
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}
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alarm_enabled &= ~alarm_type_mask;
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spin_unlock_irqrestore(&alarm_slock, flags);
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break;
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case ANDROID_ALARM_SET_OLD:
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case ANDROID_ALARM_SET_AND_WAIT_OLD:
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if (get_user(new_alarm_time.tv_sec, (int __user *)arg)) {
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rv = -EFAULT;
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goto err1;
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}
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new_alarm_time.tv_nsec = 0;
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goto from_old_alarm_set;
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case ANDROID_ALARM_SET_AND_WAIT(0):
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case ANDROID_ALARM_SET(0):
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if (copy_from_user(&new_alarm_time, (void __user *)arg,
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sizeof(new_alarm_time))) {
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rv = -EFAULT;
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goto err1;
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}
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from_old_alarm_set:
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spin_lock_irqsave(&alarm_slock, flags);
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pr_alarm(IO, "alarm %d set %ld.%09ld\n", alarm_type,
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new_alarm_time.tv_sec, new_alarm_time.tv_nsec);
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alarm_enabled |= alarm_type_mask;
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alarm_start_range(&alarms[alarm_type],
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timespec_to_ktime(new_alarm_time),
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timespec_to_ktime(new_alarm_time));
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spin_unlock_irqrestore(&alarm_slock, flags);
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if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_SET_AND_WAIT(0)
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&& cmd != ANDROID_ALARM_SET_AND_WAIT_OLD)
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break;
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/* fall though */
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case ANDROID_ALARM_WAIT:
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spin_lock_irqsave(&alarm_slock, flags);
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pr_alarm(IO, "alarm wait\n");
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if (!alarm_pending && wait_pending) {
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wake_unlock(&alarm_wake_lock);
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wait_pending = 0;
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}
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spin_unlock_irqrestore(&alarm_slock, flags);
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rv = wait_event_interruptible(alarm_wait_queue, alarm_pending);
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if (rv)
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goto err1;
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spin_lock_irqsave(&alarm_slock, flags);
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rv = alarm_pending;
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wait_pending = 1;
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alarm_pending = 0;
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spin_unlock_irqrestore(&alarm_slock, flags);
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break;
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case ANDROID_ALARM_SET_RTC:
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if (copy_from_user(&new_rtc_time, (void __user *)arg,
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sizeof(new_rtc_time))) {
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rv = -EFAULT;
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goto err1;
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}
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rv = alarm_set_rtc(new_rtc_time);
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spin_lock_irqsave(&alarm_slock, flags);
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alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK;
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wake_up(&alarm_wait_queue);
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spin_unlock_irqrestore(&alarm_slock, flags);
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if (rv < 0)
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goto err1;
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break;
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case ANDROID_ALARM_GET_TIME(0):
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switch (alarm_type) {
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case ANDROID_ALARM_RTC_WAKEUP:
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case ANDROID_ALARM_RTC:
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getnstimeofday(&tmp_time);
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break;
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case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP:
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case ANDROID_ALARM_ELAPSED_REALTIME:
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tmp_time =
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ktime_to_timespec(alarm_get_elapsed_realtime());
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break;
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case ANDROID_ALARM_TYPE_COUNT:
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case ANDROID_ALARM_SYSTEMTIME:
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ktime_get_ts(&tmp_time);
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break;
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}
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if (copy_to_user((void __user *)arg, &tmp_time,
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sizeof(tmp_time))) {
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rv = -EFAULT;
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goto err1;
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}
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break;
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default:
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rv = -EINVAL;
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goto err1;
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}
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err1:
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return rv;
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}
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static int alarm_open(struct inode *inode, struct file *file)
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{
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file->private_data = NULL;
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return 0;
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}
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static int alarm_release(struct inode *inode, struct file *file)
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{
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int i;
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unsigned long flags;
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spin_lock_irqsave(&alarm_slock, flags);
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if (file->private_data != 0) {
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for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
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uint32_t alarm_type_mask = 1U << i;
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if (alarm_enabled & alarm_type_mask) {
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pr_alarm(INFO, "alarm_release: clear alarm, "
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"pending %d\n",
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!!(alarm_pending & alarm_type_mask));
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alarm_enabled &= ~alarm_type_mask;
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}
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spin_unlock_irqrestore(&alarm_slock, flags);
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alarm_cancel(&alarms[i]);
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spin_lock_irqsave(&alarm_slock, flags);
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}
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if (alarm_pending | wait_pending) {
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if (alarm_pending)
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pr_alarm(INFO, "alarm_release: clear "
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"pending alarms %x\n", alarm_pending);
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wake_unlock(&alarm_wake_lock);
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wait_pending = 0;
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alarm_pending = 0;
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}
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alarm_opened = 0;
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}
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spin_unlock_irqrestore(&alarm_slock, flags);
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return 0;
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}
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static void alarm_triggered(struct alarm *alarm)
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{
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unsigned long flags;
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uint32_t alarm_type_mask = 1U << alarm->type;
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pr_alarm(INT, "alarm_triggered type %d\n", alarm->type);
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spin_lock_irqsave(&alarm_slock, flags);
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if (alarm_enabled & alarm_type_mask) {
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wake_lock_timeout(&alarm_wake_lock, 5 * HZ);
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alarm_enabled &= ~alarm_type_mask;
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alarm_pending |= alarm_type_mask;
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wake_up(&alarm_wait_queue);
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}
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spin_unlock_irqrestore(&alarm_slock, flags);
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}
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static const struct file_operations alarm_fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = alarm_ioctl,
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.open = alarm_open,
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.release = alarm_release,
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};
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static struct miscdevice alarm_device = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "alarm",
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.fops = &alarm_fops,
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};
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static int __init alarm_dev_init(void)
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{
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int err;
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int i;
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err = misc_register(&alarm_device);
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if (err)
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return err;
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for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++)
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alarm_init(&alarms[i], i, alarm_triggered);
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wake_lock_init(&alarm_wake_lock, WAKE_LOCK_SUSPEND, "alarm");
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return 0;
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}
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static void __exit alarm_dev_exit(void)
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{
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misc_deregister(&alarm_device);
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wake_lock_destroy(&alarm_wake_lock);
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}
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module_init(alarm_dev_init);
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module_exit(alarm_dev_exit);
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@ -0,0 +1,586 @@
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/* drivers/rtc/alarm.c
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*
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* Copyright (C) 2007-2009 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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#include <asm/mach/time.h>
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#include <linux/device.h>
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#include <linux/miscdevice.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/sysdev.h>
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#include <linux/wakelock.h>
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#include "android_alarm.h"
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#define ANDROID_ALARM_PRINT_ERROR (1U << 0)
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#define ANDROID_ALARM_PRINT_INIT_STATUS (1U << 1)
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#define ANDROID_ALARM_PRINT_TSET (1U << 2)
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#define ANDROID_ALARM_PRINT_CALL (1U << 3)
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#define ANDROID_ALARM_PRINT_SUSPEND (1U << 4)
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#define ANDROID_ALARM_PRINT_INT (1U << 5)
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#define ANDROID_ALARM_PRINT_FLOW (1U << 6)
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static int debug_mask = ANDROID_ALARM_PRINT_ERROR | \
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ANDROID_ALARM_PRINT_INIT_STATUS;
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module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
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#define pr_alarm(debug_level_mask, args...) \
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do { \
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if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) { \
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pr_info(args); \
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} \
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} while (0)
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#define ANDROID_ALARM_WAKEUP_MASK ( \
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ANDROID_ALARM_RTC_WAKEUP_MASK | \
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ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
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/* support old usespace code */
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#define ANDROID_ALARM_SET_OLD _IOW('a', 2, time_t) /* set alarm */
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#define ANDROID_ALARM_SET_AND_WAIT_OLD _IOW('a', 3, time_t)
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struct alarm_queue {
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struct rb_root alarms;
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struct rb_node *first;
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struct hrtimer timer;
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ktime_t delta;
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bool stopped;
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ktime_t stopped_time;
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};
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static struct rtc_device *alarm_rtc_dev;
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static DEFINE_SPINLOCK(alarm_slock);
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static DEFINE_MUTEX(alarm_setrtc_mutex);
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static struct wake_lock alarm_rtc_wake_lock;
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static struct platform_device *alarm_platform_dev;
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struct alarm_queue alarms[ANDROID_ALARM_TYPE_COUNT];
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static bool suspended;
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static void update_timer_locked(struct alarm_queue *base, bool head_removed)
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{
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struct alarm *alarm;
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bool is_wakeup = base == &alarms[ANDROID_ALARM_RTC_WAKEUP] ||
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base == &alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP];
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if (base->stopped) {
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pr_alarm(FLOW, "changed alarm while setting the wall time\n");
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return;
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}
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if (is_wakeup && !suspended && head_removed)
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wake_unlock(&alarm_rtc_wake_lock);
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if (!base->first)
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return;
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alarm = container_of(base->first, struct alarm, node);
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pr_alarm(FLOW, "selected alarm, type %d, func %pF at %lld\n",
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alarm->type, alarm->function, ktime_to_ns(alarm->expires));
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if (is_wakeup && suspended) {
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pr_alarm(FLOW, "changed alarm while suspened\n");
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wake_lock_timeout(&alarm_rtc_wake_lock, 1 * HZ);
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return;
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}
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hrtimer_try_to_cancel(&base->timer);
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base->timer.node.expires = ktime_add(base->delta, alarm->expires);
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base->timer._softexpires = ktime_add(base->delta, alarm->softexpires);
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hrtimer_start_expires(&base->timer, HRTIMER_MODE_ABS);
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}
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static void alarm_enqueue_locked(struct alarm *alarm)
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{
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struct alarm_queue *base = &alarms[alarm->type];
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struct rb_node **link = &base->alarms.rb_node;
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struct rb_node *parent = NULL;
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struct alarm *entry;
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int leftmost = 1;
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pr_alarm(FLOW, "added alarm, type %d, func %pF at %lld\n",
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alarm->type, alarm->function, ktime_to_ns(alarm->expires));
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if (base->first == &alarm->node)
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base->first = rb_next(&alarm->node);
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if (!RB_EMPTY_NODE(&alarm->node)) {
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rb_erase(&alarm->node, &base->alarms);
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RB_CLEAR_NODE(&alarm->node);
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}
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while (*link) {
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parent = *link;
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entry = rb_entry(parent, struct alarm, node);
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/*
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* We dont care about collisions. Nodes with
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* the same expiry time stay together.
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*/
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if (alarm->expires.tv64 < entry->expires.tv64) {
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link = &(*link)->rb_left;
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} else {
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link = &(*link)->rb_right;
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leftmost = 0;
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}
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}
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if (leftmost) {
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base->first = &alarm->node;
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update_timer_locked(base, false);
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}
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rb_link_node(&alarm->node, parent, link);
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rb_insert_color(&alarm->node, &base->alarms);
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}
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/**
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* alarm_init - initialize an alarm
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* @alarm: the alarm to be initialized
|
||||
* @type: the alarm type to be used
|
||||
* @function: alarm callback function
|
||||
*/
|
||||
void alarm_init(struct alarm *alarm,
|
||||
enum android_alarm_type type, void (*function)(struct alarm *))
|
||||
{
|
||||
RB_CLEAR_NODE(&alarm->node);
|
||||
alarm->type = type;
|
||||
alarm->function = function;
|
||||
|
||||
pr_alarm(FLOW, "created alarm, type %d, func %pF\n", type, function);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* alarm_start_range - (re)start an alarm
|
||||
* @alarm: the alarm to be added
|
||||
* @start: earliest expiry time
|
||||
* @end: expiry time
|
||||
*/
|
||||
void alarm_start_range(struct alarm *alarm, ktime_t start, ktime_t end)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&alarm_slock, flags);
|
||||
alarm->softexpires = start;
|
||||
alarm->expires = end;
|
||||
alarm_enqueue_locked(alarm);
|
||||
spin_unlock_irqrestore(&alarm_slock, flags);
|
||||
}
|
||||
|
||||
/**
|
||||
* alarm_try_to_cancel - try to deactivate an alarm
|
||||
* @alarm: alarm to stop
|
||||
*
|
||||
* Returns:
|
||||
* 0 when the alarm was not active
|
||||
* 1 when the alarm was active
|
||||
* -1 when the alarm may currently be excuting the callback function and
|
||||
* cannot be stopped (it may also be inactive)
|
||||
*/
|
||||
int alarm_try_to_cancel(struct alarm *alarm)
|
||||
{
|
||||
struct alarm_queue *base = &alarms[alarm->type];
|
||||
unsigned long flags;
|
||||
bool first = false;
|
||||
int ret = 0;
|
||||
|
||||
spin_lock_irqsave(&alarm_slock, flags);
|
||||
if (!RB_EMPTY_NODE(&alarm->node)) {
|
||||
pr_alarm(FLOW, "canceled alarm, type %d, func %pF at %lld\n",
|
||||
alarm->type, alarm->function,
|
||||
ktime_to_ns(alarm->expires));
|
||||
ret = 1;
|
||||
if (base->first == &alarm->node) {
|
||||
base->first = rb_next(&alarm->node);
|
||||
first = true;
|
||||
}
|
||||
rb_erase(&alarm->node, &base->alarms);
|
||||
RB_CLEAR_NODE(&alarm->node);
|
||||
if (first)
|
||||
update_timer_locked(base, true);
|
||||
} else
|
||||
pr_alarm(FLOW, "tried to cancel alarm, type %d, func %pF\n",
|
||||
alarm->type, alarm->function);
|
||||
spin_unlock_irqrestore(&alarm_slock, flags);
|
||||
if (!ret && hrtimer_callback_running(&base->timer))
|
||||
ret = -1;
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* alarm_cancel - cancel an alarm and wait for the handler to finish.
|
||||
* @alarm: the alarm to be cancelled
|
||||
*
|
||||
* Returns:
|
||||
* 0 when the alarm was not active
|
||||
* 1 when the alarm was active
|
||||
*/
|
||||
int alarm_cancel(struct alarm *alarm)
|
||||
{
|
||||
for (;;) {
|
||||
int ret = alarm_try_to_cancel(alarm);
|
||||
if (ret >= 0)
|
||||
return ret;
|
||||
cpu_relax();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* alarm_set_rtc - set the kernel and rtc walltime
|
||||
* @new_time: timespec value containing the new time
|
||||
*/
|
||||
int alarm_set_rtc(struct timespec new_time)
|
||||
{
|
||||
int i;
|
||||
int ret;
|
||||
unsigned long flags;
|
||||
struct rtc_time rtc_new_rtc_time;
|
||||
struct timespec tmp_time;
|
||||
|
||||
rtc_time_to_tm(new_time.tv_sec, &rtc_new_rtc_time);
|
||||
|
||||
pr_alarm(TSET, "set rtc %ld %ld - rtc %02d:%02d:%02d %02d/%02d/%04d\n",
|
||||
new_time.tv_sec, new_time.tv_nsec,
|
||||
rtc_new_rtc_time.tm_hour, rtc_new_rtc_time.tm_min,
|
||||
rtc_new_rtc_time.tm_sec, rtc_new_rtc_time.tm_mon + 1,
|
||||
rtc_new_rtc_time.tm_mday,
|
||||
rtc_new_rtc_time.tm_year + 1900);
|
||||
|
||||
mutex_lock(&alarm_setrtc_mutex);
|
||||
spin_lock_irqsave(&alarm_slock, flags);
|
||||
wake_lock(&alarm_rtc_wake_lock);
|
||||
getnstimeofday(&tmp_time);
|
||||
for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++) {
|
||||
hrtimer_try_to_cancel(&alarms[i].timer);
|
||||
alarms[i].stopped = true;
|
||||
alarms[i].stopped_time = timespec_to_ktime(tmp_time);
|
||||
}
|
||||
alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].delta =
|
||||
alarms[ANDROID_ALARM_ELAPSED_REALTIME].delta =
|
||||
ktime_sub(alarms[ANDROID_ALARM_ELAPSED_REALTIME].delta,
|
||||
timespec_to_ktime(timespec_sub(tmp_time, new_time)));
|
||||
spin_unlock_irqrestore(&alarm_slock, flags);
|
||||
ret = do_settimeofday(&new_time);
|
||||
spin_lock_irqsave(&alarm_slock, flags);
|
||||
for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++) {
|
||||
alarms[i].stopped = false;
|
||||
update_timer_locked(&alarms[i], false);
|
||||
}
|
||||
spin_unlock_irqrestore(&alarm_slock, flags);
|
||||
if (ret < 0) {
|
||||
pr_alarm(ERROR, "alarm_set_rtc: Failed to set time\n");
|
||||
goto err;
|
||||
}
|
||||
if (!alarm_rtc_dev) {
|
||||
pr_alarm(ERROR,
|
||||
"alarm_set_rtc: no RTC, time will be lost on reboot\n");
|
||||
goto err;
|
||||
}
|
||||
ret = rtc_set_time(alarm_rtc_dev, &rtc_new_rtc_time);
|
||||
if (ret < 0)
|
||||
pr_alarm(ERROR, "alarm_set_rtc: "
|
||||
"Failed to set RTC, time will be lost on reboot\n");
|
||||
err:
|
||||
wake_unlock(&alarm_rtc_wake_lock);
|
||||
mutex_unlock(&alarm_setrtc_mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* alarm_get_elapsed_realtime - get the elapsed real time in ktime_t format
|
||||
*
|
||||
* returns the time in ktime_t format
|
||||
*/
|
||||
ktime_t alarm_get_elapsed_realtime(void)
|
||||
{
|
||||
ktime_t now;
|
||||
unsigned long flags;
|
||||
struct alarm_queue *base = &alarms[ANDROID_ALARM_ELAPSED_REALTIME];
|
||||
|
||||
spin_lock_irqsave(&alarm_slock, flags);
|
||||
now = base->stopped ? base->stopped_time : ktime_get_real();
|
||||
now = ktime_sub(now, base->delta);
|
||||
spin_unlock_irqrestore(&alarm_slock, flags);
|
||||
return now;
|
||||
}
|
||||
|
||||
static enum hrtimer_restart alarm_timer_triggered(struct hrtimer *timer)
|
||||
{
|
||||
struct alarm_queue *base;
|
||||
struct alarm *alarm;
|
||||
unsigned long flags;
|
||||
ktime_t now;
|
||||
|
||||
spin_lock_irqsave(&alarm_slock, flags);
|
||||
|
||||
base = container_of(timer, struct alarm_queue, timer);
|
||||
now = base->stopped ? base->stopped_time : hrtimer_cb_get_time(timer);
|
||||
now = ktime_sub(now, base->delta);
|
||||
|
||||
pr_alarm(INT, "alarm_timer_triggered type %d at %lld\n",
|
||||
base - alarms, ktime_to_ns(now));
|
||||
|
||||
while (base->first) {
|
||||
alarm = container_of(base->first, struct alarm, node);
|
||||
if (alarm->softexpires.tv64 > now.tv64) {
|
||||
pr_alarm(FLOW, "don't call alarm, %pF, %lld (s %lld)\n",
|
||||
alarm->function, ktime_to_ns(alarm->expires),
|
||||
ktime_to_ns(alarm->softexpires));
|
||||
break;
|
||||
}
|
||||
base->first = rb_next(&alarm->node);
|
||||
rb_erase(&alarm->node, &base->alarms);
|
||||
RB_CLEAR_NODE(&alarm->node);
|
||||
pr_alarm(CALL, "call alarm, type %d, func %pF, %lld (s %lld)\n",
|
||||
alarm->type, alarm->function,
|
||||
ktime_to_ns(alarm->expires),
|
||||
ktime_to_ns(alarm->softexpires));
|
||||
spin_unlock_irqrestore(&alarm_slock, flags);
|
||||
alarm->function(alarm);
|
||||
spin_lock_irqsave(&alarm_slock, flags);
|
||||
}
|
||||
if (!base->first)
|
||||
pr_alarm(FLOW, "no more alarms of type %d\n", base - alarms);
|
||||
update_timer_locked(base, true);
|
||||
spin_unlock_irqrestore(&alarm_slock, flags);
|
||||
return HRTIMER_NORESTART;
|
||||
}
|
||||
|
||||
static void alarm_triggered_func(void *p)
|
||||
{
|
||||
struct rtc_device *rtc = alarm_rtc_dev;
|
||||
if (!(rtc->irq_data & RTC_AF))
|
||||
return;
|
||||
pr_alarm(INT, "rtc alarm triggered\n");
|
||||
wake_lock_timeout(&alarm_rtc_wake_lock, 1 * HZ);
|
||||
}
|
||||
|
||||
static int alarm_suspend(struct platform_device *pdev, pm_message_t state)
|
||||
{
|
||||
int err = 0;
|
||||
unsigned long flags;
|
||||
struct rtc_wkalrm rtc_alarm;
|
||||
struct rtc_time rtc_current_rtc_time;
|
||||
unsigned long rtc_current_time;
|
||||
unsigned long rtc_alarm_time;
|
||||
struct timespec rtc_current_timespec;
|
||||
struct timespec rtc_delta;
|
||||
struct alarm_queue *wakeup_queue = NULL;
|
||||
struct alarm_queue *tmp_queue = NULL;
|
||||
|
||||
pr_alarm(SUSPEND, "alarm_suspend(%p, %d)\n", pdev, state.event);
|
||||
|
||||
spin_lock_irqsave(&alarm_slock, flags);
|
||||
suspended = true;
|
||||
spin_unlock_irqrestore(&alarm_slock, flags);
|
||||
|
||||
hrtimer_cancel(&alarms[ANDROID_ALARM_RTC_WAKEUP].timer);
|
||||
hrtimer_cancel(&alarms[
|
||||
ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK].timer);
|
||||
|
||||
tmp_queue = &alarms[ANDROID_ALARM_RTC_WAKEUP];
|
||||
if (tmp_queue->first)
|
||||
wakeup_queue = tmp_queue;
|
||||
tmp_queue = &alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP];
|
||||
if (tmp_queue->first && (!wakeup_queue ||
|
||||
hrtimer_get_expires(&tmp_queue->timer).tv64 <
|
||||
hrtimer_get_expires(&wakeup_queue->timer).tv64))
|
||||
wakeup_queue = tmp_queue;
|
||||
if (wakeup_queue) {
|
||||
rtc_read_time(alarm_rtc_dev, &rtc_current_rtc_time);
|
||||
rtc_current_timespec.tv_nsec = 0;
|
||||
rtc_tm_to_time(&rtc_current_rtc_time,
|
||||
&rtc_current_timespec.tv_sec);
|
||||
save_time_delta(&rtc_delta, &rtc_current_timespec);
|
||||
|
||||
rtc_alarm_time = timespec_sub(ktime_to_timespec(
|
||||
hrtimer_get_expires(&wakeup_queue->timer)),
|
||||
rtc_delta).tv_sec;
|
||||
|
||||
rtc_time_to_tm(rtc_alarm_time, &rtc_alarm.time);
|
||||
rtc_alarm.enabled = 1;
|
||||
rtc_set_alarm(alarm_rtc_dev, &rtc_alarm);
|
||||
rtc_read_time(alarm_rtc_dev, &rtc_current_rtc_time);
|
||||
rtc_tm_to_time(&rtc_current_rtc_time, &rtc_current_time);
|
||||
pr_alarm(SUSPEND,
|
||||
"rtc alarm set at %ld, now %ld, rtc delta %ld.%09ld\n",
|
||||
rtc_alarm_time, rtc_current_time,
|
||||
rtc_delta.tv_sec, rtc_delta.tv_nsec);
|
||||
if (rtc_current_time + 1 >= rtc_alarm_time) {
|
||||
pr_alarm(SUSPEND, "alarm about to go off\n");
|
||||
memset(&rtc_alarm, 0, sizeof(rtc_alarm));
|
||||
rtc_alarm.enabled = 0;
|
||||
rtc_set_alarm(alarm_rtc_dev, &rtc_alarm);
|
||||
|
||||
spin_lock_irqsave(&alarm_slock, flags);
|
||||
suspended = false;
|
||||
wake_lock_timeout(&alarm_rtc_wake_lock, 2 * HZ);
|
||||
update_timer_locked(&alarms[ANDROID_ALARM_RTC_WAKEUP],
|
||||
false);
|
||||
update_timer_locked(&alarms[
|
||||
ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP], false);
|
||||
err = -EBUSY;
|
||||
spin_unlock_irqrestore(&alarm_slock, flags);
|
||||
}
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
static int alarm_resume(struct platform_device *pdev)
|
||||
{
|
||||
struct rtc_wkalrm alarm;
|
||||
unsigned long flags;
|
||||
|
||||
pr_alarm(SUSPEND, "alarm_resume(%p)\n", pdev);
|
||||
|
||||
memset(&alarm, 0, sizeof(alarm));
|
||||
alarm.enabled = 0;
|
||||
rtc_set_alarm(alarm_rtc_dev, &alarm);
|
||||
|
||||
spin_lock_irqsave(&alarm_slock, flags);
|
||||
suspended = false;
|
||||
update_timer_locked(&alarms[ANDROID_ALARM_RTC_WAKEUP], false);
|
||||
update_timer_locked(&alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP],
|
||||
false);
|
||||
spin_unlock_irqrestore(&alarm_slock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct rtc_task alarm_rtc_task = {
|
||||
.func = alarm_triggered_func
|
||||
};
|
||||
|
||||
static int rtc_alarm_add_device(struct device *dev,
|
||||
struct class_interface *class_intf)
|
||||
{
|
||||
int err;
|
||||
struct rtc_device *rtc = to_rtc_device(dev);
|
||||
|
||||
mutex_lock(&alarm_setrtc_mutex);
|
||||
|
||||
if (alarm_rtc_dev) {
|
||||
err = -EBUSY;
|
||||
goto err1;
|
||||
}
|
||||
|
||||
alarm_platform_dev =
|
||||
platform_device_register_simple("alarm", -1, NULL, 0);
|
||||
if (IS_ERR(alarm_platform_dev)) {
|
||||
err = PTR_ERR(alarm_platform_dev);
|
||||
goto err2;
|
||||
}
|
||||
err = rtc_irq_register(rtc, &alarm_rtc_task);
|
||||
if (err)
|
||||
goto err3;
|
||||
alarm_rtc_dev = rtc;
|
||||
pr_alarm(INIT_STATUS, "using rtc device, %s, for alarms", rtc->name);
|
||||
mutex_unlock(&alarm_setrtc_mutex);
|
||||
|
||||
return 0;
|
||||
|
||||
err3:
|
||||
platform_device_unregister(alarm_platform_dev);
|
||||
err2:
|
||||
err1:
|
||||
mutex_unlock(&alarm_setrtc_mutex);
|
||||
return err;
|
||||
}
|
||||
|
||||
static void rtc_alarm_remove_device(struct device *dev,
|
||||
struct class_interface *class_intf)
|
||||
{
|
||||
if (dev == &alarm_rtc_dev->dev) {
|
||||
pr_alarm(INIT_STATUS, "lost rtc device for alarms");
|
||||
rtc_irq_unregister(alarm_rtc_dev, &alarm_rtc_task);
|
||||
platform_device_unregister(alarm_platform_dev);
|
||||
alarm_rtc_dev = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
static struct class_interface rtc_alarm_interface = {
|
||||
.add_dev = &rtc_alarm_add_device,
|
||||
.remove_dev = &rtc_alarm_remove_device,
|
||||
};
|
||||
|
||||
static struct platform_driver alarm_driver = {
|
||||
.suspend = alarm_suspend,
|
||||
.resume = alarm_resume,
|
||||
.driver = {
|
||||
.name = "alarm"
|
||||
}
|
||||
};
|
||||
|
||||
static int __init alarm_late_init(void)
|
||||
{
|
||||
unsigned long flags;
|
||||
struct timespec tmp_time, system_time;
|
||||
|
||||
/* this needs to run after the rtc is read at boot */
|
||||
spin_lock_irqsave(&alarm_slock, flags);
|
||||
/* We read the current rtc and system time so we can later calulate
|
||||
* elasped realtime to be (boot_systemtime + rtc - boot_rtc) ==
|
||||
* (rtc - (boot_rtc - boot_systemtime))
|
||||
*/
|
||||
getnstimeofday(&tmp_time);
|
||||
ktime_get_ts(&system_time);
|
||||
alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].delta =
|
||||
alarms[ANDROID_ALARM_ELAPSED_REALTIME].delta =
|
||||
timespec_to_ktime(timespec_sub(tmp_time, system_time));
|
||||
|
||||
spin_unlock_irqrestore(&alarm_slock, flags);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __init alarm_driver_init(void)
|
||||
{
|
||||
int err;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++) {
|
||||
hrtimer_init(&alarms[i].timer,
|
||||
CLOCK_REALTIME, HRTIMER_MODE_ABS);
|
||||
alarms[i].timer.function = alarm_timer_triggered;
|
||||
}
|
||||
hrtimer_init(&alarms[ANDROID_ALARM_SYSTEMTIME].timer,
|
||||
CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
|
||||
alarms[ANDROID_ALARM_SYSTEMTIME].timer.function = alarm_timer_triggered;
|
||||
err = platform_driver_register(&alarm_driver);
|
||||
if (err < 0)
|
||||
goto err1;
|
||||
wake_lock_init(&alarm_rtc_wake_lock, WAKE_LOCK_SUSPEND, "alarm_rtc");
|
||||
rtc_alarm_interface.class = rtc_class;
|
||||
err = class_interface_register(&rtc_alarm_interface);
|
||||
if (err < 0)
|
||||
goto err2;
|
||||
|
||||
return 0;
|
||||
|
||||
err2:
|
||||
wake_lock_destroy(&alarm_rtc_wake_lock);
|
||||
platform_driver_unregister(&alarm_driver);
|
||||
err1:
|
||||
return err;
|
||||
}
|
||||
|
||||
static void __exit alarm_exit(void)
|
||||
{
|
||||
class_interface_unregister(&rtc_alarm_interface);
|
||||
wake_lock_destroy(&alarm_rtc_wake_lock);
|
||||
platform_driver_unregister(&alarm_driver);
|
||||
}
|
||||
|
||||
late_initcall(alarm_late_init);
|
||||
module_init(alarm_driver_init);
|
||||
module_exit(alarm_exit);
|
||||
|
||||
|
|
@ -0,0 +1,106 @@
|
|||
/* 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);
|
||||
|
||||
#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
|
||||
Loading…
Reference in New Issue