--- /dev/null
+/* drivers/rtc/alarm-dev.c
+ *
+ * Copyright (C) 2007-2009 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.
+ *
+ */
+
+#include <linux/time.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include <linux/alarmtimer.h>
+#include "android_alarm.h"
+
+#define ANDROID_ALARM_PRINT_INFO (1U << 0)
+#define ANDROID_ALARM_PRINT_IO (1U << 1)
+#define ANDROID_ALARM_PRINT_INT (1U << 2)
+
+static int debug_mask = ANDROID_ALARM_PRINT_INFO;
+module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
+
+#define alarm_dbg(debug_level_mask, fmt, ...) \
+do { \
+ if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) \
+ pr_info(fmt, ##__VA_ARGS__); \
+} while (0)
+
+#define ANDROID_ALARM_WAKEUP_MASK ( \
+ ANDROID_ALARM_RTC_WAKEUP_MASK | \
+ ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
+
+static int alarm_opened;
+static DEFINE_SPINLOCK(alarm_slock);
+static struct wakeup_source alarm_wake_lock;
+static DECLARE_WAIT_QUEUE_HEAD(alarm_wait_queue);
+static uint32_t alarm_pending;
+static uint32_t alarm_enabled;
+static uint32_t wait_pending;
+
+struct devalarm {
+ union {
+ struct hrtimer hrt;
+ struct alarm alrm;
+ } u;
+ enum android_alarm_type type;
+};
+
+static struct devalarm alarms[ANDROID_ALARM_TYPE_COUNT];
+
+/**
+ * is_wakeup() - Checks to see if this alarm can wake the device
+ * @type: The type of alarm being checked
+ *
+ * Return: 1 if this is a wakeup alarm, otherwise 0
+ */
+static int is_wakeup(enum android_alarm_type type)
+{
+ return type == ANDROID_ALARM_RTC_WAKEUP ||
+ type == ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP;
+}
+
+static void devalarm_start(struct devalarm *alrm, ktime_t exp)
+{
+ if (is_wakeup(alrm->type))
+ alarm_start(&alrm->u.alrm, exp);
+ else
+ hrtimer_start(&alrm->u.hrt, exp, HRTIMER_MODE_ABS);
+}
+
+static int devalarm_try_to_cancel(struct devalarm *alrm)
+{
+ if (is_wakeup(alrm->type))
+ return alarm_try_to_cancel(&alrm->u.alrm);
+ return hrtimer_try_to_cancel(&alrm->u.hrt);
+}
+
+static void devalarm_cancel(struct devalarm *alrm)
+{
+ if (is_wakeup(alrm->type))
+ alarm_cancel(&alrm->u.alrm);
+ else
+ hrtimer_cancel(&alrm->u.hrt);
+}
+
+static void alarm_clear(enum android_alarm_type alarm_type)
+{
+ uint32_t alarm_type_mask = 1U << alarm_type;
+ unsigned long flags;
+
+ spin_lock_irqsave(&alarm_slock, flags);
+ alarm_dbg(IO, "alarm %d clear\n", alarm_type);
+ devalarm_try_to_cancel(&alarms[alarm_type]);
+ if (alarm_pending) {
+ alarm_pending &= ~alarm_type_mask;
+ if (!alarm_pending && !wait_pending)
+ __pm_relax(&alarm_wake_lock);
+ }
+ alarm_enabled &= ~alarm_type_mask;
+ spin_unlock_irqrestore(&alarm_slock, flags);
+}
+
+static void alarm_set(enum android_alarm_type alarm_type,
+ struct timespec *ts)
+{
+ uint32_t alarm_type_mask = 1U << alarm_type;
+ unsigned long flags;
+
+ spin_lock_irqsave(&alarm_slock, flags);
+ alarm_dbg(IO, "alarm %d set %ld.%09ld\n",
+ alarm_type, ts->tv_sec, ts->tv_nsec);
+ alarm_enabled |= alarm_type_mask;
+ devalarm_start(&alarms[alarm_type], timespec_to_ktime(*ts));
+ spin_unlock_irqrestore(&alarm_slock, flags);
+}
+
+static int alarm_wait(void)
+{
+ unsigned long flags;
+ int rv = 0;
+
+ spin_lock_irqsave(&alarm_slock, flags);
+ alarm_dbg(IO, "alarm wait\n");
+ if (!alarm_pending && wait_pending) {
+ __pm_relax(&alarm_wake_lock);
+ wait_pending = 0;
+ }
+ spin_unlock_irqrestore(&alarm_slock, flags);
+
+ rv = wait_event_interruptible(alarm_wait_queue, alarm_pending);
+ if (rv)
+ return rv;
+
+ spin_lock_irqsave(&alarm_slock, flags);
+ rv = alarm_pending;
+ wait_pending = 1;
+ alarm_pending = 0;
+ spin_unlock_irqrestore(&alarm_slock, flags);
+
+ return rv;
+}
+
+static int alarm_set_rtc(struct timespec *ts)
+{
+ struct rtc_time new_rtc_tm;
+ struct rtc_device *rtc_dev;
+ unsigned long flags;
+ int rv = 0;
+
+ rtc_time_to_tm(ts->tv_sec, &new_rtc_tm);
+ rtc_dev = alarmtimer_get_rtcdev();
+ rv = do_settimeofday(ts);
+ if (rv < 0)
+ return rv;
+ if (rtc_dev)
+ rv = rtc_set_time(rtc_dev, &new_rtc_tm);
+
+ spin_lock_irqsave(&alarm_slock, flags);
+ alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK;
+ wake_up(&alarm_wait_queue);
+ spin_unlock_irqrestore(&alarm_slock, flags);
+
+ return rv;
+}
+
+static int alarm_get_time(enum android_alarm_type alarm_type,
+ struct timespec *ts)
+{
+ int rv = 0;
+
+ switch (alarm_type) {
+ case ANDROID_ALARM_RTC_WAKEUP:
+ case ANDROID_ALARM_RTC:
+ getnstimeofday(ts);
+ break;
+ case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP:
+ case ANDROID_ALARM_ELAPSED_REALTIME:
+ get_monotonic_boottime(ts);
+ break;
+ case ANDROID_ALARM_SYSTEMTIME:
+ ktime_get_ts(ts);
+ break;
+ default:
+ rv = -EINVAL;
+ }
+ return rv;
+}
+
+static long alarm_do_ioctl(struct file *file, unsigned int cmd,
+ struct timespec *ts)
+{
+ int rv = 0;
+ unsigned long flags;
+ enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd);
+
+ if (alarm_type >= ANDROID_ALARM_TYPE_COUNT)
+ return -EINVAL;
+
+ if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) {
+ if ((file->f_flags & O_ACCMODE) == O_RDONLY)
+ return -EPERM;
+ if (file->private_data == NULL &&
+ cmd != ANDROID_ALARM_SET_RTC) {
+ spin_lock_irqsave(&alarm_slock, flags);
+ if (alarm_opened) {
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ return -EBUSY;
+ }
+ alarm_opened = 1;
+ file->private_data = (void *)1;
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ }
+ }
+
+ switch (ANDROID_ALARM_BASE_CMD(cmd)) {
+ case ANDROID_ALARM_CLEAR(0):
+ alarm_clear(alarm_type);
+ break;
+ case ANDROID_ALARM_SET(0):
+ alarm_set(alarm_type, ts);
+ break;
+ case ANDROID_ALARM_SET_AND_WAIT(0):
+ alarm_set(alarm_type, ts);
+ /* fall though */
+ case ANDROID_ALARM_WAIT:
+ rv = alarm_wait();
+ break;
+ case ANDROID_ALARM_SET_RTC:
+ rv = alarm_set_rtc(ts);
+ break;
+ case ANDROID_ALARM_GET_TIME(0):
+ rv = alarm_get_time(alarm_type, ts);
+ break;
+
+ default:
+ rv = -EINVAL;
+ }
+ return rv;
+}
+
+static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+
+ struct timespec ts;
+ int rv;
+
+ switch (ANDROID_ALARM_BASE_CMD(cmd)) {
+ case ANDROID_ALARM_SET_AND_WAIT(0):
+ case ANDROID_ALARM_SET(0):
+ case ANDROID_ALARM_SET_RTC:
+ if (copy_from_user(&ts, (void __user *)arg, sizeof(ts)))
+ return -EFAULT;
+ break;
+ }
+
+ rv = alarm_do_ioctl(file, cmd, &ts);
+ if (rv)
+ return rv;
+
+ switch (ANDROID_ALARM_BASE_CMD(cmd)) {
+ case ANDROID_ALARM_GET_TIME(0):
+ if (copy_to_user((void __user *)arg, &ts, sizeof(ts)))
+ return -EFAULT;
+ break;
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_COMPAT
+static long alarm_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+
+ struct timespec ts;
+ int rv;
+
+ switch (ANDROID_ALARM_BASE_CMD(cmd)) {
+ case ANDROID_ALARM_SET_AND_WAIT_COMPAT(0):
+ case ANDROID_ALARM_SET_COMPAT(0):
+ case ANDROID_ALARM_SET_RTC_COMPAT:
+ if (compat_get_timespec(&ts, (void __user *)arg))
+ return -EFAULT;
+ /* fall through */
+ case ANDROID_ALARM_GET_TIME_COMPAT(0):
+ cmd = ANDROID_ALARM_COMPAT_TO_NORM(cmd);
+ break;
+ }
+
+ rv = alarm_do_ioctl(file, cmd, &ts);
+ if (rv)
+ return rv;
+
+ switch (ANDROID_ALARM_BASE_CMD(cmd)) {
+ case ANDROID_ALARM_GET_TIME(0): /* NOTE: we modified cmd above */
+ if (compat_put_timespec(&ts, (void __user *)arg))
+ return -EFAULT;
+ break;
+ }
+
+ return 0;
+}
+#endif
+
+static int alarm_open(struct inode *inode, struct file *file)
+{
+ file->private_data = NULL;
+ return 0;
+}
+
+static int alarm_release(struct inode *inode, struct file *file)
+{
+ int i;
+ unsigned long flags;
+
+ spin_lock_irqsave(&alarm_slock, flags);
+ if (file->private_data) {
+ for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
+ uint32_t alarm_type_mask = 1U << i;
+
+ if (alarm_enabled & alarm_type_mask) {
+ alarm_dbg(INFO,
+ "%s: clear alarm, pending %d\n",
+ __func__,
+ !!(alarm_pending & alarm_type_mask));
+ alarm_enabled &= ~alarm_type_mask;
+ }
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ devalarm_cancel(&alarms[i]);
+ spin_lock_irqsave(&alarm_slock, flags);
+ }
+ if (alarm_pending | wait_pending) {
+ if (alarm_pending)
+ alarm_dbg(INFO, "%s: clear pending alarms %x\n",
+ __func__, alarm_pending);
+ __pm_relax(&alarm_wake_lock);
+ wait_pending = 0;
+ alarm_pending = 0;
+ }
+ alarm_opened = 0;
+ }
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ return 0;
+}
+
+static void devalarm_triggered(struct devalarm *alarm)
+{
+ unsigned long flags;
+ uint32_t alarm_type_mask = 1U << alarm->type;
+
+ alarm_dbg(INT, "%s: type %d\n", __func__, alarm->type);
+ spin_lock_irqsave(&alarm_slock, flags);
+ if (alarm_enabled & alarm_type_mask) {
+ __pm_wakeup_event(&alarm_wake_lock, 5000); /* 5secs */
+ alarm_enabled &= ~alarm_type_mask;
+ alarm_pending |= alarm_type_mask;
+ wake_up(&alarm_wait_queue);
+ }
+ spin_unlock_irqrestore(&alarm_slock, flags);
+}
+
+static enum hrtimer_restart devalarm_hrthandler(struct hrtimer *hrt)
+{
+ struct devalarm *devalrm = container_of(hrt, struct devalarm, u.hrt);
+
+ devalarm_triggered(devalrm);
+ return HRTIMER_NORESTART;
+}
+
+static enum alarmtimer_restart devalarm_alarmhandler(struct alarm *alrm,
+ ktime_t now)
+{
+ struct devalarm *devalrm = container_of(alrm, struct devalarm, u.alrm);
+
+ devalarm_triggered(devalrm);
+ return ALARMTIMER_NORESTART;
+}
+
+
+static const struct file_operations alarm_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = alarm_ioctl,
+ .open = alarm_open,
+ .release = alarm_release,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = alarm_compat_ioctl,
+#endif
+};
+
+static struct miscdevice alarm_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "alarm",
+ .fops = &alarm_fops,
+};
+
+static int __init alarm_dev_init(void)
+{
+ int err;
+ int i;
+
+ err = misc_register(&alarm_device);
+ if (err)
+ return err;
+
+ alarm_init(&alarms[ANDROID_ALARM_RTC_WAKEUP].u.alrm,
+ ALARM_REALTIME, devalarm_alarmhandler);
+ hrtimer_init(&alarms[ANDROID_ALARM_RTC].u.hrt,
+ CLOCK_REALTIME, HRTIMER_MODE_ABS);
+ alarm_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].u.alrm,
+ ALARM_BOOTTIME, devalarm_alarmhandler);
+ hrtimer_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME].u.hrt,
+ CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
+ hrtimer_init(&alarms[ANDROID_ALARM_SYSTEMTIME].u.hrt,
+ CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+
+ for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
+ alarms[i].type = i;
+ if (!is_wakeup(i))
+ alarms[i].u.hrt.function = devalarm_hrthandler;
+ }
+
+ wakeup_source_init(&alarm_wake_lock, "alarm");
+ return 0;
+}
+
+static void __exit alarm_dev_exit(void)
+{
+ misc_deregister(&alarm_device);
+ wakeup_source_trash(&alarm_wake_lock);
+}
+
+module_init(alarm_dev_init);
+module_exit(alarm_dev_exit);
+MODULE_LICENSE("GPL");
--- /dev/null
+/* drivers/staging/android/uapi/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 _UAPI_LINUX_ANDROID_ALARM_H
+#define _UAPI_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 */
+};
+
+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
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