rtc: Add android alarm driver.
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index ce2aabf..cc0f9b1 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -106,6 +106,16 @@
clock several times per second, please enable this option
only if you know that you really need it.
+config RTC_INTF_ALARM
+ bool "Android alarm driver"
+ depends on RTC_CLASS
+ default y
+ help
+ Provides non-wakeup and rtc backed wakeup alarms based on rtc or
+ elapsed realtime, and a non-wakeup alarm on the monotonic clock.
+ Also provides an ioctl to set the wall time which must be used
+ for elapsed realtime to work.
+
config RTC_DRV_TEST
tristate "Test driver/device"
help
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 0ffefe8..b50672a 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -9,6 +9,7 @@
obj-$(CONFIG_RTC_CLASS) += rtc-core.o
rtc-core-y := class.o interface.o
+rtc-core-$(CONFIG_RTC_INTF_ALARM) += alarm.o
rtc-core-$(CONFIG_RTC_INTF_DEV) += rtc-dev.o
rtc-core-$(CONFIG_RTC_INTF_PROC) += rtc-proc.o
rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
diff --git a/drivers/rtc/alarm.c b/drivers/rtc/alarm.c
new file mode 100644
index 0000000..cd660ee
--- /dev/null
+++ b/drivers/rtc/alarm.c
@@ -0,0 +1,568 @@
+/* drivers/rtc/alarm.c
+ *
+ * Copyright (C) 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.
+ *
+ */
+
+#include <asm/mach/time.h>
+#include <linux/android_alarm.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/sysdev.h>
+#include <linux/wakelock.h>
+
+#define ANDROID_ALARM_PRINT_ERRORS (1U << 0)
+#define ANDROID_ALARM_PRINT_INIT_STATUS (1U << 1)
+#define ANDROID_ALARM_PRINT_INFO (1U << 2)
+#define ANDROID_ALARM_PRINT_IO (1U << 3)
+#define ANDROID_ALARM_PRINT_INT (1U << 4)
+#define ANDROID_ALARM_PRINT_FLOW (1U << 5)
+
+#if 0
+#define ANDROID_ALARM_DPRINTF_MASK (~0)
+#define ANDROID_ALARM_DPRINTF(debug_level_mask, args...) \
+ do { \
+ if (ANDROID_ALARM_DPRINTF_MASK & debug_level_mask) { \
+ printk(args); \
+ } \
+ } while (0)
+#else
+#define ANDROID_ALARM_DPRINTF(args...)
+#endif
+
+#define ANDROID_ALARM_WAKEUP_MASK ( \
+ ANDROID_ALARM_RTC_WAKEUP_MASK | \
+ ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
+
+/* support old usespace code */
+#define ANDROID_ALARM_SET_OLD _IOW('a', 2, time_t) /* set alarm */
+#define ANDROID_ALARM_SET_AND_WAIT_OLD _IOW('a', 3, time_t)
+
+static struct rtc_device *alarm_rtc_dev;
+static int alarm_opened;
+static DEFINE_SPINLOCK(alarm_slock);
+static DEFINE_MUTEX(alarm_setrtc_mutex);
+static struct wake_lock alarm_wake_lock;
+static struct wake_lock alarm_rtc_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;
+static struct platform_device *alarm_platform_dev;
+static struct hrtimer alarm_timer[ANDROID_ALARM_TYPE_COUNT];
+static struct timespec alarm_time[ANDROID_ALARM_TYPE_COUNT];
+static struct timespec elapsed_rtc_delta;
+
+static void alarm_start_hrtimer(enum android_alarm_type alarm_type)
+{
+ struct timespec hr_alarm_time;
+ if (!(alarm_enabled & (1U << alarm_type)))
+ return;
+ hr_alarm_time = alarm_time[alarm_type];
+ if (alarm_type == ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP ||
+ alarm_type == ANDROID_ALARM_ELAPSED_REALTIME)
+ set_normalized_timespec(&hr_alarm_time,
+ hr_alarm_time.tv_sec + elapsed_rtc_delta.tv_sec,
+ hr_alarm_time.tv_nsec + elapsed_rtc_delta.tv_nsec);
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_FLOW,
+ "alarm start hrtimer %d at %ld.%09ld\n",
+ alarm_type, hr_alarm_time.tv_sec, hr_alarm_time.tv_nsec);
+ hrtimer_start(&alarm_timer[alarm_type],
+ timespec_to_ktime(hr_alarm_time), HRTIMER_MODE_ABS);
+}
+
+static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ int rv = 0;
+ unsigned long flags;
+ int i;
+ struct timespec new_alarm_time;
+ struct timespec new_rtc_time;
+ struct timespec tmp_time;
+ struct rtc_time rtc_new_rtc_time;
+ enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd);
+ uint32_t alarm_type_mask = 1U << alarm_type;
+
+ 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):
+ spin_lock_irqsave(&alarm_slock, flags);
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_IO,
+ "alarm %d clear\n", alarm_type);
+ hrtimer_try_to_cancel(&alarm_timer[alarm_type]);
+ if (alarm_pending) {
+ alarm_pending &= ~alarm_type_mask;
+ if (!alarm_pending && !wait_pending)
+ wake_unlock(&alarm_wake_lock);
+ }
+ alarm_enabled &= ~alarm_type_mask;
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ break;
+
+ case ANDROID_ALARM_SET_OLD:
+ case ANDROID_ALARM_SET_AND_WAIT_OLD:
+ if (get_user(new_alarm_time.tv_sec, (int __user *)arg)) {
+ rv = -EFAULT;
+ goto err1;
+ }
+ new_alarm_time.tv_nsec = 0;
+ goto from_old_alarm_set;
+
+ case ANDROID_ALARM_SET_AND_WAIT(0):
+ case ANDROID_ALARM_SET(0):
+ if (copy_from_user(&new_alarm_time, (void __user *)arg,
+ sizeof(new_alarm_time))) {
+ rv = -EFAULT;
+ goto err1;
+ }
+from_old_alarm_set:
+ spin_lock_irqsave(&alarm_slock, flags);
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_IO,
+ "alarm %d set %ld.%09ld\n", alarm_type,
+ new_alarm_time.tv_sec, new_alarm_time.tv_nsec);
+ alarm_time[alarm_type] = new_alarm_time;
+ alarm_enabled |= alarm_type_mask;
+ alarm_start_hrtimer(alarm_type);
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_SET_AND_WAIT(0)
+ && cmd != ANDROID_ALARM_SET_AND_WAIT_OLD)
+ break;
+ /* fall though */
+ case ANDROID_ALARM_WAIT:
+ spin_lock_irqsave(&alarm_slock, flags);
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_IO, "alarm wait\n");
+ if (!alarm_pending && wait_pending) {
+ wake_unlock(&alarm_wake_lock);
+ wait_pending = 0;
+ }
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ rv = wait_event_interruptible(alarm_wait_queue, alarm_pending);
+ if (rv)
+ goto err1;
+ spin_lock_irqsave(&alarm_slock, flags);
+ rv = alarm_pending;
+ wait_pending = 1;
+ alarm_pending = 0;
+ if (rv & ANDROID_ALARM_WAKEUP_MASK)
+ wake_unlock(&alarm_rtc_wake_lock);
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ break;
+ case ANDROID_ALARM_SET_RTC:
+ if (copy_from_user(&new_rtc_time, (void __user *)arg,
+ sizeof(new_rtc_time))) {
+ rv = -EFAULT;
+ goto err1;
+ }
+ rtc_time_to_tm(new_rtc_time.tv_sec, &rtc_new_rtc_time);
+
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_IO,
+ "set rtc %ld %ld - rtc %02d:%02d:%02d %02d/%02d/%04d\n",
+ new_rtc_time.tv_sec, new_rtc_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);
+ for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++)
+ hrtimer_try_to_cancel(&alarm_timer[i]);
+ getnstimeofday(&tmp_time);
+ elapsed_rtc_delta = timespec_sub(elapsed_rtc_delta,
+ timespec_sub(tmp_time, new_rtc_time));
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ rv = do_settimeofday(&new_rtc_time);
+ spin_lock_irqsave(&alarm_slock, flags);
+ for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++)
+ alarm_start_hrtimer(i);
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ if (rv < 0) {
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_ERRORS,
+ "Failed to set time\n");
+ mutex_unlock(&alarm_setrtc_mutex);
+ goto err1;
+ }
+ rv = rtc_set_time(alarm_rtc_dev, &rtc_new_rtc_time);
+ spin_lock_irqsave(&alarm_slock, flags);
+ alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK;
+ wake_up(&alarm_wait_queue);
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ mutex_unlock(&alarm_setrtc_mutex);
+ if (rv < 0) {
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_ERRORS,
+ "Failed to set RTC, time will be lost on reboot\n");
+ goto err1;
+ }
+ break;
+ case ANDROID_ALARM_GET_TIME(0):
+ mutex_lock(&alarm_setrtc_mutex);
+ spin_lock_irqsave(&alarm_slock, flags);
+ if (alarm_type != ANDROID_ALARM_SYSTEMTIME) {
+ getnstimeofday(&tmp_time);
+ if (alarm_type >= ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP)
+ tmp_time = timespec_sub(tmp_time,
+ elapsed_rtc_delta);
+ } else
+ ktime_get_ts(&tmp_time);
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ mutex_unlock(&alarm_setrtc_mutex);
+ if (copy_to_user((void __user *)arg, &tmp_time,
+ sizeof(tmp_time))) {
+ rv = -EFAULT;
+ goto err1;
+ }
+ break;
+
+ default:
+ rv = -EINVAL;
+ goto err1;
+ }
+err1:
+ return rv;
+}
+
+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 != 0) {
+ for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
+ uint32_t alarm_type_mask = 1U << i;
+ if (alarm_enabled & alarm_type_mask) {
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO,
+ "alarm_release: clear alarm, "
+ "pending %d\n",
+ !!(alarm_pending & alarm_type_mask));
+ alarm_enabled &= ~alarm_type_mask;
+ }
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ hrtimer_cancel(&alarm_timer[i]);
+ spin_lock_irqsave(&alarm_slock, flags);
+ }
+ if (alarm_pending | wait_pending) {
+ if (alarm_pending)
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO,
+ "alarm_release: clear pending alarms "
+ "%x\n", alarm_pending);
+ wake_unlock(&alarm_wake_lock);
+ wait_pending = 0;
+ alarm_pending = 0;
+ }
+ alarm_opened = 0;
+ }
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ return 0;
+}
+
+static enum hrtimer_restart alarm_timer_triggered(struct hrtimer *timer)
+{
+ unsigned long flags;
+ enum android_alarm_type alarm_type = (timer - alarm_timer);
+ uint32_t alarm_type_mask = 1U << alarm_type;
+
+
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INT,
+ "alarm_timer_triggered type %d\n", alarm_type);
+ spin_lock_irqsave(&alarm_slock, flags);
+ if (alarm_enabled & alarm_type_mask) {
+ wake_lock_timeout(&alarm_wake_lock, 5 * HZ);
+ alarm_enabled &= ~alarm_type_mask;
+ alarm_pending |= alarm_type_mask;
+ wake_up(&alarm_wait_queue);
+ }
+ 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;
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INT, "rtc alarm triggered\n");
+ wake_lock_timeout(&alarm_rtc_wake_lock, 1 * HZ);
+}
+
+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 timespec elapsed_realtime_alarm_time;
+
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_FLOW,
+ "alarm_suspend(%p, %d)\n", pdev, state.event);
+ spin_lock_irqsave(&alarm_slock, flags);
+ if (alarm_pending && !wake_lock_active(&alarm_wake_lock)) {
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO,
+ "alarm pending\n");
+ err = -EBUSY;
+ goto err1;
+ }
+ if (alarm_enabled & ANDROID_ALARM_WAKEUP_MASK) {
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ if (alarm_enabled & ANDROID_ALARM_RTC_WAKEUP_MASK)
+ hrtimer_cancel(&alarm_timer[ANDROID_ALARM_RTC_WAKEUP]);
+ if (alarm_enabled & ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
+ hrtimer_cancel(&alarm_timer[
+ ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP]);
+
+ 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);
+ set_normalized_timespec(&elapsed_realtime_alarm_time,
+ alarm_time[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP]
+ .tv_sec + elapsed_rtc_delta.tv_sec,
+ alarm_time[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP]
+ .tv_nsec + elapsed_rtc_delta.tv_nsec);
+ if ((alarm_enabled & ANDROID_ALARM_RTC_WAKEUP_MASK) &&
+ (!(alarm_enabled &
+ ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK) ||
+ timespec_compare(&alarm_time[ANDROID_ALARM_RTC_WAKEUP],
+ &elapsed_realtime_alarm_time) < 0))
+ rtc_alarm_time = timespec_sub(
+ alarm_time[ANDROID_ALARM_RTC_WAKEUP],
+ rtc_delta).tv_sec;
+ else
+ rtc_alarm_time = timespec_sub(
+ elapsed_realtime_alarm_time, 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);
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO,
+ "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) {
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO,
+ "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);
+ wake_lock_timeout(&alarm_rtc_wake_lock, 2 * HZ);
+ alarm_start_hrtimer(ANDROID_ALARM_RTC_WAKEUP);
+ alarm_start_hrtimer(
+ ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP);
+ err = -EBUSY;
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ }
+ } else {
+err1:
+ spin_unlock_irqrestore(&alarm_slock, flags);
+ }
+ return err;
+}
+
+int alarm_resume(struct platform_device *pdev)
+{
+ struct rtc_wkalrm alarm;
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_FLOW,
+ "alarm_resume(%p)\n", pdev);
+ if (alarm_enabled & ANDROID_ALARM_WAKEUP_MASK) {
+ memset(&alarm, 0, sizeof(alarm));
+ alarm.enabled = 0;
+ rtc_set_alarm(alarm_rtc_dev, &alarm);
+ alarm_start_hrtimer(ANDROID_ALARM_RTC_WAKEUP);
+ alarm_start_hrtimer(ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP);
+ }
+ return 0;
+}
+
+static struct rtc_task alarm_rtc_task = {
+ .func = alarm_triggered_func
+};
+
+static struct file_operations alarm_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = alarm_ioctl,
+ .open = alarm_open,
+ .release = alarm_release,
+};
+
+static struct miscdevice alarm_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "alarm",
+ .fops = &alarm_fops,
+};
+
+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;
+ }
+
+ err = misc_register(&alarm_device);
+ if (err)
+ 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;
+ mutex_unlock(&alarm_setrtc_mutex);
+
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO, "alarm: parent %p\n",
+ alarm_platform_dev->dev.power.pm_parent);
+ return 0;
+
+err3:
+ platform_device_unregister(alarm_platform_dev);
+err2:
+ misc_deregister(&alarm_device);
+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) {
+ rtc_irq_unregister(alarm_rtc_dev, &alarm_rtc_task);
+ platform_device_unregister(alarm_platform_dev);
+ misc_deregister(&alarm_device);
+ 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 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(&elapsed_rtc_delta);
+ ktime_get_ts(&system_time);
+ elapsed_rtc_delta = timespec_sub(elapsed_rtc_delta, system_time);
+ spin_unlock_irqrestore(&alarm_slock, flags);
+
+ ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO,
+ "alarm_late_init: rtc to elapsed realtime delta %ld.%09ld\n",
+ elapsed_rtc_delta.tv_sec, elapsed_rtc_delta.tv_nsec);
+ return 0;
+}
+
+static int __init alarm_init(void)
+{
+ int err;
+ int i;
+
+ for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++) {
+ hrtimer_init(&alarm_timer[i], CLOCK_REALTIME, HRTIMER_MODE_ABS);
+ alarm_timer[i].function = alarm_timer_triggered;
+ }
+ hrtimer_init(&alarm_timer[ANDROID_ALARM_SYSTEMTIME],
+ CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+ alarm_timer[ANDROID_ALARM_SYSTEMTIME].function = alarm_timer_triggered;
+ err = platform_driver_register(&alarm_driver);
+ if (err < 0)
+ goto err1;
+ wake_lock_init(&alarm_wake_lock, WAKE_LOCK_SUSPEND, "alarm");
+ 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);
+ wake_lock_destroy(&alarm_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);
+ wake_lock_destroy(&alarm_wake_lock);
+ platform_driver_unregister(&alarm_driver);
+}
+
+late_initcall(alarm_late_init);
+module_init(alarm_init);
+module_exit(alarm_exit);
+
diff --git a/include/linux/android_alarm.h b/include/linux/android_alarm.h
new file mode 100644
index 0000000..d0cafd6
--- /dev/null
+++ b/include/linux/android_alarm.h
@@ -0,0 +1,62 @@
+/* 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 */
+};
+
+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