287 lines
7.6 KiB
C
287 lines
7.6 KiB
C
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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/android_alarm.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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#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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