[deliverable/linux.git] / drivers / staging / android / alarm-dev.c

/* 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)

/* support old userspace 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 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];


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 long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	int rv = 0;
	unsigned long flags;
	struct timespec new_alarm_time;
	struct timespec new_rtc_time;
	struct timespec tmp_time;
	struct rtc_time new_rtc_tm;
	struct rtc_device *rtc_dev;
	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);
		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);
		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);
		alarm_dbg(IO, "alarm %d set %ld.%09ld\n",
			  alarm_type,
			  new_alarm_time.tv_sec, new_alarm_time.tv_nsec);
		alarm_enabled |= alarm_type_mask;
		devalarm_start(&alarms[alarm_type],
			timespec_to_ktime(new_alarm_time));
		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);
		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)
			goto err1;
		spin_lock_irqsave(&alarm_slock, flags);
		rv = alarm_pending;
		wait_pending = 1;
		alarm_pending = 0;
		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, &new_rtc_tm);
		rtc_dev = alarmtimer_get_rtcdev();
		rv = do_settimeofday(&new_rtc_time);
		if (rv < 0)
			goto err1;
		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);
		if (rv < 0)
			goto err1;
		break;
	case ANDROID_ALARM_GET_TIME(0):
		switch (alarm_type) {
		case ANDROID_ALARM_RTC_WAKEUP:
		case ANDROID_ALARM_RTC:
			getnstimeofday(&tmp_time);
			break;
		case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP:
		case ANDROID_ALARM_ELAPSED_REALTIME:
			get_monotonic_boottime(&tmp_time);
			break;
		case ANDROID_ALARM_SYSTEMTIME:
			ktime_get_ts(&tmp_time);
			break;
		default:
			rv = -EINVAL;
			goto err1;
		}
		if (copy_to_user((void __user *)arg, &tmp_time,
		    sizeof(tmp_time))) {
			rv = -EFAULT;
			goto err1;
		}
		break;

	default:
		rv = -EINVAL;
	}
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) {
		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,
};

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);
Commit	Line	Data
841cb11c AH	1	/* drivers/rtc/alarm-dev.c
	2	*
	3	* Copyright (C) 2007-2009 Google, Inc.
	4	*
	5	* This software is licensed under the terms of the GNU General Public
	6	* License version 2, as published by the Free Software Foundation, and
	7	* may be copied, distributed, and modified under those terms.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	*/
	15
d47908b2	16	#include <linux/time.h>
bf647ea7	17	#include <linux/module.h>
841cb11c AH	18	#include <linux/device.h>
	19	#include <linux/miscdevice.h>
	20	#include <linux/fs.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/sched.h>
	23	#include <linux/spinlock.h>
841cb11c	24	#include <linux/uaccess.h>
b8793260	25	#include <linux/alarmtimer.h>
841cb11c AH	26	#include "android_alarm.h"
	27
	28	#define ANDROID_ALARM_PRINT_INFO (1U << 0)
	29	#define ANDROID_ALARM_PRINT_IO (1U << 1)
	30	#define ANDROID_ALARM_PRINT_INT (1U << 2)
	31
	32	static int debug_mask = ANDROID_ALARM_PRINT_INFO;
	33	module_param_named(debug_mask, debug_mask, int, S_IRUGO \| S_IWUSR \| S_IWGRP);
	34
8a7245ea JP	35	#define alarm_dbg(debug_level_mask, fmt, ...) \
	36	do { \
	37	if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) \
	38	pr_info(fmt, ##__VA_ARGS__); \
	39	} while (0)
841cb11c AH	40
	41	#define ANDROID_ALARM_WAKEUP_MASK ( \
	42	ANDROID_ALARM_RTC_WAKEUP_MASK \| \
	43	ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
	44
ad220db4	45	/* support old userspace code */
841cb11c AH	46	#define ANDROID_ALARM_SET_OLD _IOW('a', 2, time_t) /* set alarm */
	47	#define ANDROID_ALARM_SET_AND_WAIT_OLD _IOW('a', 3, time_t)
	48
	49	static int alarm_opened;
	50	static DEFINE_SPINLOCK(alarm_slock);
a180c0d6	51	static struct wakeup_source alarm_wake_lock;
841cb11c AH	52	static DECLARE_WAIT_QUEUE_HEAD(alarm_wait_queue);
	53	static uint32_t alarm_pending;
	54	static uint32_t alarm_enabled;
	55	static uint32_t wait_pending;
	56
b8793260 JS	57	struct devalarm {
	58	union {
	59	struct hrtimer hrt;
	60	struct alarm alrm;
	61	} u;
	62	enum android_alarm_type type;
	63	};
	64
	65	static struct devalarm alarms[ANDROID_ALARM_TYPE_COUNT];
	66
	67
	68	static int is_wakeup(enum android_alarm_type type)
	69	{
147cd165 DK	70	return (type == ANDROID_ALARM_RTC_WAKEUP \|\|
147cd165 DK	71	type == ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP);
b8793260 JS	72	}
	73
	74
	75	static void devalarm_start(struct devalarm *alrm, ktime_t exp)
	76	{
	77	if (is_wakeup(alrm->type))
	78	alarm_start(&alrm->u.alrm, exp);
	79	else
	80	hrtimer_start(&alrm->u.hrt, exp, HRTIMER_MODE_ABS);
	81	}
	82
	83
	84	static int devalarm_try_to_cancel(struct devalarm *alrm)
	85	{
b8793260	86	if (is_wakeup(alrm->type))
147cd165 DK	87	return alarm_try_to_cancel(&alrm->u.alrm);
147cd165 DK	88	return hrtimer_try_to_cancel(&alrm->u.hrt);
b8793260 JS	89	}
	90
	91	static void devalarm_cancel(struct devalarm *alrm)
	92	{
	93	if (is_wakeup(alrm->type))
	94	alarm_cancel(&alrm->u.alrm);
	95	else
	96	hrtimer_cancel(&alrm->u.hrt);
	97	}
	98
841cb11c AH	99
	100	static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	101	{
	102	int rv = 0;
	103	unsigned long flags;
	104	struct timespec new_alarm_time;
	105	struct timespec new_rtc_time;
	106	struct timespec tmp_time;
b8793260 JS	107	struct rtc_time new_rtc_tm;
b8793260 JS	108	struct rtc_device *rtc_dev;
841cb11c AH	109	enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd);
	110	uint32_t alarm_type_mask = 1U << alarm_type;
	111
	112	if (alarm_type >= ANDROID_ALARM_TYPE_COUNT)
	113	return -EINVAL;
	114
	115	if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) {
	116	if ((file->f_flags & O_ACCMODE) == O_RDONLY)
	117	return -EPERM;
	118	if (file->private_data == NULL &&
	119	cmd != ANDROID_ALARM_SET_RTC) {
	120	spin_lock_irqsave(&alarm_slock, flags);
	121	if (alarm_opened) {
	122	spin_unlock_irqrestore(&alarm_slock, flags);
	123	return -EBUSY;
	124	}
	125	alarm_opened = 1;
	126	file->private_data = (void *)1;
	127	spin_unlock_irqrestore(&alarm_slock, flags);
	128	}
	129	}
	130
	131	switch (ANDROID_ALARM_BASE_CMD(cmd)) {
	132	case ANDROID_ALARM_CLEAR(0):
	133	spin_lock_irqsave(&alarm_slock, flags);
8a7245ea	134	alarm_dbg(IO, "alarm %d clear\n", alarm_type);
b8793260	135	devalarm_try_to_cancel(&alarms[alarm_type]);
841cb11c AH	136	if (alarm_pending) {
	137	alarm_pending &= ~alarm_type_mask;
	138	if (!alarm_pending && !wait_pending)
a180c0d6	139	__pm_relax(&alarm_wake_lock);
841cb11c AH	140	}
	141	alarm_enabled &= ~alarm_type_mask;
	142	spin_unlock_irqrestore(&alarm_slock, flags);
	143	break;
	144
	145	case ANDROID_ALARM_SET_OLD:
	146	case ANDROID_ALARM_SET_AND_WAIT_OLD:
	147	if (get_user(new_alarm_time.tv_sec, (int __user *)arg)) {
	148	rv = -EFAULT;
	149	goto err1;
	150	}
	151	new_alarm_time.tv_nsec = 0;
	152	goto from_old_alarm_set;
	153
	154	case ANDROID_ALARM_SET_AND_WAIT(0):
	155	case ANDROID_ALARM_SET(0):
	156	if (copy_from_user(&new_alarm_time, (void __user *)arg,
	157	sizeof(new_alarm_time))) {
	158	rv = -EFAULT;
	159	goto err1;
	160	}
	161	from_old_alarm_set:
	162	spin_lock_irqsave(&alarm_slock, flags);
8a7245ea JP	163	alarm_dbg(IO, "alarm %d set %ld.%09ld\n",
	164	alarm_type,
	165	new_alarm_time.tv_sec, new_alarm_time.tv_nsec);
841cb11c	166	alarm_enabled \|= alarm_type_mask;
b8793260	167	devalarm_start(&alarms[alarm_type],
841cb11c AH	168	timespec_to_ktime(new_alarm_time));
	169	spin_unlock_irqrestore(&alarm_slock, flags);
	170	if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_SET_AND_WAIT(0)
	171	&& cmd != ANDROID_ALARM_SET_AND_WAIT_OLD)
	172	break;
	173	/* fall though */
	174	case ANDROID_ALARM_WAIT:
	175	spin_lock_irqsave(&alarm_slock, flags);
8a7245ea	176	alarm_dbg(IO, "alarm wait\n");
841cb11c	177	if (!alarm_pending && wait_pending) {
a180c0d6	178	__pm_relax(&alarm_wake_lock);
841cb11c AH	179	wait_pending = 0;
	180	}
	181	spin_unlock_irqrestore(&alarm_slock, flags);
	182	rv = wait_event_interruptible(alarm_wait_queue, alarm_pending);
	183	if (rv)
	184	goto err1;
	185	spin_lock_irqsave(&alarm_slock, flags);
	186	rv = alarm_pending;
	187	wait_pending = 1;
	188	alarm_pending = 0;
	189	spin_unlock_irqrestore(&alarm_slock, flags);
	190	break;
	191	case ANDROID_ALARM_SET_RTC:
	192	if (copy_from_user(&new_rtc_time, (void __user *)arg,
	193	sizeof(new_rtc_time))) {
	194	rv = -EFAULT;
	195	goto err1;
	196	}
b8793260 JS	197	rtc_time_to_tm(new_rtc_time.tv_sec, &new_rtc_tm);
	198	rtc_dev = alarmtimer_get_rtcdev();
	199	rv = do_settimeofday(&new_rtc_time);
	200	if (rv < 0)
	201	goto err1;
	202	if (rtc_dev)
	203	rv = rtc_set_time(rtc_dev, &new_rtc_tm);
841cb11c AH	204	spin_lock_irqsave(&alarm_slock, flags);
	205	alarm_pending \|= ANDROID_ALARM_TIME_CHANGE_MASK;
	206	wake_up(&alarm_wait_queue);
	207	spin_unlock_irqrestore(&alarm_slock, flags);
	208	if (rv < 0)
	209	goto err1;
	210	break;
	211	case ANDROID_ALARM_GET_TIME(0):
	212	switch (alarm_type) {
	213	case ANDROID_ALARM_RTC_WAKEUP:
	214	case ANDROID_ALARM_RTC:
	215	getnstimeofday(&tmp_time);
	216	break;
	217	case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP:
	218	case ANDROID_ALARM_ELAPSED_REALTIME:
e2d8ccef	219	get_monotonic_boottime(&tmp_time);
841cb11c	220	break;
841cb11c AH	221	case ANDROID_ALARM_SYSTEMTIME:
	222	ktime_get_ts(&tmp_time);
	223	break;
147cd165 DK	224	default:
	225	rv = -EINVAL;
	226	goto err1;
841cb11c AH	227	}
	228	if (copy_to_user((void __user *)arg, &tmp_time,
	229	sizeof(tmp_time))) {
	230	rv = -EFAULT;
	231	goto err1;
	232	}
	233	break;
	234
	235	default:
	236	rv = -EINVAL;
841cb11c AH	237	}
	238	err1:
	239	return rv;
	240	}
	241
	242	static int alarm_open(struct inode inode, struct file file)
	243	{
	244	file->private_data = NULL;
	245	return 0;
	246	}
	247
	248	static int alarm_release(struct inode inode, struct file file)
	249	{
	250	int i;
	251	unsigned long flags;
	252
	253	spin_lock_irqsave(&alarm_slock, flags);
592314e9	254	if (file->private_data) {
841cb11c AH	255	for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
	256	uint32_t alarm_type_mask = 1U << i;
	257	if (alarm_enabled & alarm_type_mask) {
8a7245ea JP	258	alarm_dbg(INFO,
	259	"%s: clear alarm, pending %d\n",
	260	__func__,
	261	!!(alarm_pending & alarm_type_mask));
841cb11c AH	262	alarm_enabled &= ~alarm_type_mask;
	263	}
	264	spin_unlock_irqrestore(&alarm_slock, flags);
b8793260	265	devalarm_cancel(&alarms[i]);
841cb11c AH	266	spin_lock_irqsave(&alarm_slock, flags);
	267	}
	268	if (alarm_pending \| wait_pending) {
	269	if (alarm_pending)
8a7245ea JP	270	alarm_dbg(INFO, "%s: clear pending alarms %x\n",
8a7245ea JP	271	__func__, alarm_pending);
a180c0d6	272	__pm_relax(&alarm_wake_lock);
841cb11c AH	273	wait_pending = 0;
	274	alarm_pending = 0;
	275	}
	276	alarm_opened = 0;
	277	}
	278	spin_unlock_irqrestore(&alarm_slock, flags);
	279	return 0;
	280	}
	281
b8793260	282	static void devalarm_triggered(struct devalarm *alarm)
841cb11c AH	283	{
	284	unsigned long flags;
	285	uint32_t alarm_type_mask = 1U << alarm->type;
	286
8a7245ea	287	alarm_dbg(INT, "%s: type %d\n", __func__, alarm->type);
841cb11c AH	288	spin_lock_irqsave(&alarm_slock, flags);
841cb11c AH	289	if (alarm_enabled & alarm_type_mask) {
a180c0d6	290	__pm_wakeup_event(&alarm_wake_lock, 5000); /* 5secs */
841cb11c AH	291	alarm_enabled &= ~alarm_type_mask;
	292	alarm_pending \|= alarm_type_mask;
	293	wake_up(&alarm_wait_queue);
	294	}
	295	spin_unlock_irqrestore(&alarm_slock, flags);
	296	}
	297
b8793260 JS	298
	299	static enum hrtimer_restart devalarm_hrthandler(struct hrtimer *hrt)
	300	{
	301	struct devalarm *devalrm = container_of(hrt, struct devalarm, u.hrt);
	302
	303	devalarm_triggered(devalrm);
	304	return HRTIMER_NORESTART;
	305	}
	306
	307	static enum alarmtimer_restart devalarm_alarmhandler(struct alarm *alrm,
	308	ktime_t now)
	309	{
	310	struct devalarm *devalrm = container_of(alrm, struct devalarm, u.alrm);
	311
	312	devalarm_triggered(devalrm);
	313	return ALARMTIMER_NORESTART;
	314	}
	315
	316
841cb11c AH	317	static const struct file_operations alarm_fops = {
	318	.owner = THIS_MODULE,
	319	.unlocked_ioctl = alarm_ioctl,
	320	.open = alarm_open,
	321	.release = alarm_release,
	322	};
	323
	324	static struct miscdevice alarm_device = {
	325	.minor = MISC_DYNAMIC_MINOR,
	326	.name = "alarm",
	327	.fops = &alarm_fops,
	328	};
	329
	330	static int __init alarm_dev_init(void)
	331	{
	332	int err;
	333	int i;
	334
	335	err = misc_register(&alarm_device);
	336	if (err)
	337	return err;
	338
b8793260 JS	339	alarm_init(&alarms[ANDROID_ALARM_RTC_WAKEUP].u.alrm,
	340	ALARM_REALTIME, devalarm_alarmhandler);
	341	hrtimer_init(&alarms[ANDROID_ALARM_RTC].u.hrt,
	342	CLOCK_REALTIME, HRTIMER_MODE_ABS);
	343	alarm_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].u.alrm,
	344	ALARM_BOOTTIME, devalarm_alarmhandler);
	345	hrtimer_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME].u.hrt,
	346	CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
	347	hrtimer_init(&alarms[ANDROID_ALARM_SYSTEMTIME].u.hrt,
	348	CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
	349
	350	for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
	351	alarms[i].type = i;
	352	if (!is_wakeup(i))
	353	alarms[i].u.hrt.function = devalarm_hrthandler;
	354	}
	355
a180c0d6	356	wakeup_source_init(&alarm_wake_lock, "alarm");
841cb11c AH	357	return 0;
	358	}
	359
	360	static void __exit alarm_dev_exit(void)
	361	{
	362	misc_deregister(&alarm_device);
a180c0d6	363	wakeup_source_trash(&alarm_wake_lock);
841cb11c AH	364	}
	365
	366	module_init(alarm_dev_init);
	367	module_exit(alarm_dev_exit);
	368