[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)

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);
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
841cb11c AH	45	static int alarm_opened;
841cb11c AH	46	static DEFINE_SPINLOCK(alarm_slock);
a180c0d6	47	static struct wakeup_source alarm_wake_lock;
841cb11c AH	48	static DECLARE_WAIT_QUEUE_HEAD(alarm_wait_queue);
	49	static uint32_t alarm_pending;
	50	static uint32_t alarm_enabled;
	51	static uint32_t wait_pending;
	52
b8793260 JS	53	struct devalarm {
	54	union {
	55	struct hrtimer hrt;
	56	struct alarm alrm;
	57	} u;
	58	enum android_alarm_type type;
	59	};
	60
	61	static struct devalarm alarms[ANDROID_ALARM_TYPE_COUNT];
	62
b59f105c CJB	63	/**
	64	* is_wakeup() - Checks to see if this alarm can wake the device
	65	* @type: The type of alarm being checked
	66	*
	67	* Return: 1 if this is a wakeup alarm, otherwise 0
	68	*/
b8793260 JS	69	static int is_wakeup(enum android_alarm_type type)
b8793260 JS	70	{
6eaf842a SP	71	return type == ANDROID_ALARM_RTC_WAKEUP \|\|
6eaf842a SP	72	type == ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP;
b8793260 JS	73	}
b8793260 JS	74
b8793260 JS	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
b8793260 JS	83	static int devalarm_try_to_cancel(struct devalarm *alrm)
b8793260 JS	84	{
b8793260	85	if (is_wakeup(alrm->type))
147cd165 DK	86	return alarm_try_to_cancel(&alrm->u.alrm);
147cd165 DK	87	return hrtimer_try_to_cancel(&alrm->u.hrt);
b8793260 JS	88	}
	89
	90	static void devalarm_cancel(struct devalarm *alrm)
	91	{
	92	if (is_wakeup(alrm->type))
	93	alarm_cancel(&alrm->u.alrm);
	94	else
	95	hrtimer_cancel(&alrm->u.hrt);
	96	}
	97
cec8bb73 JS	98	static void alarm_clear(enum android_alarm_type alarm_type)
	99	{
	100	uint32_t alarm_type_mask = 1U << alarm_type;
	101	unsigned long flags;
841cb11c	102
cec8bb73 JS	103	spin_lock_irqsave(&alarm_slock, flags);
	104	alarm_dbg(IO, "alarm %d clear\n", alarm_type);
	105	devalarm_try_to_cancel(&alarms[alarm_type]);
	106	if (alarm_pending) {
	107	alarm_pending &= ~alarm_type_mask;
	108	if (!alarm_pending && !wait_pending)
	109	__pm_relax(&alarm_wake_lock);
	110	}
	111	alarm_enabled &= ~alarm_type_mask;
	112	spin_unlock_irqrestore(&alarm_slock, flags);
cec8bb73 JS	113	}
	114
	115	static void alarm_set(enum android_alarm_type alarm_type,
	116	struct timespec *ts)
841cb11c	117	{
cec8bb73	118	uint32_t alarm_type_mask = 1U << alarm_type;
841cb11c	119	unsigned long flags;
cec8bb73 JS	120
	121	spin_lock_irqsave(&alarm_slock, flags);
	122	alarm_dbg(IO, "alarm %d set %ld.%09ld\n",
	123	alarm_type, ts->tv_sec, ts->tv_nsec);
	124	alarm_enabled \|= alarm_type_mask;
	125	devalarm_start(&alarms[alarm_type], timespec_to_ktime(*ts));
	126	spin_unlock_irqrestore(&alarm_slock, flags);
	127	}
	128
	129	static int alarm_wait(void)
	130	{
	131	unsigned long flags;
	132	int rv = 0;
	133
	134	spin_lock_irqsave(&alarm_slock, flags);
	135	alarm_dbg(IO, "alarm wait\n");
	136	if (!alarm_pending && wait_pending) {
	137	__pm_relax(&alarm_wake_lock);
	138	wait_pending = 0;
	139	}
	140	spin_unlock_irqrestore(&alarm_slock, flags);
	141
	142	rv = wait_event_interruptible(alarm_wait_queue, alarm_pending);
	143	if (rv)
	144	return rv;
	145
	146	spin_lock_irqsave(&alarm_slock, flags);
	147	rv = alarm_pending;
	148	wait_pending = 1;
	149	alarm_pending = 0;
	150	spin_unlock_irqrestore(&alarm_slock, flags);
	151
	152	return rv;
	153	}
	154
	155	static int alarm_set_rtc(struct timespec *ts)
	156	{
b8793260 JS	157	struct rtc_time new_rtc_tm;
b8793260 JS	158	struct rtc_device *rtc_dev;
cec8bb73 JS	159	unsigned long flags;
	160	int rv = 0;
	161
	162	rtc_time_to_tm(ts->tv_sec, &new_rtc_tm);
	163	rtc_dev = alarmtimer_get_rtcdev();
	164	rv = do_settimeofday(ts);
	165	if (rv < 0)
	166	return rv;
	167	if (rtc_dev)
	168	rv = rtc_set_time(rtc_dev, &new_rtc_tm);
	169
	170	spin_lock_irqsave(&alarm_slock, flags);
	171	alarm_pending \|= ANDROID_ALARM_TIME_CHANGE_MASK;
	172	wake_up(&alarm_wait_queue);
	173	spin_unlock_irqrestore(&alarm_slock, flags);
	174
	175	return rv;
	176	}
	177
	178	static int alarm_get_time(enum android_alarm_type alarm_type,
	179	struct timespec *ts)
	180	{
	181	int rv = 0;
	182
	183	switch (alarm_type) {
	184	case ANDROID_ALARM_RTC_WAKEUP:
	185	case ANDROID_ALARM_RTC:
	186	getnstimeofday(ts);
	187	break;
	188	case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP:
	189	case ANDROID_ALARM_ELAPSED_REALTIME:
	190	get_monotonic_boottime(ts);
	191	break;
	192	case ANDROID_ALARM_SYSTEMTIME:
	193	ktime_get_ts(ts);
	194	break;
	195	default:
	196	rv = -EINVAL;
	197	}
	198	return rv;
	199	}
	200
	201	static long alarm_do_ioctl(struct file *file, unsigned int cmd,
	202	struct timespec *ts)
	203	{
	204	int rv = 0;
	205	unsigned long flags;
841cb11c	206	enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd);
841cb11c AH	207
	208	if (alarm_type >= ANDROID_ALARM_TYPE_COUNT)
	209	return -EINVAL;
	210
	211	if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) {
	212	if ((file->f_flags & O_ACCMODE) == O_RDONLY)
	213	return -EPERM;
	214	if (file->private_data == NULL &&
	215	cmd != ANDROID_ALARM_SET_RTC) {
	216	spin_lock_irqsave(&alarm_slock, flags);
	217	if (alarm_opened) {
	218	spin_unlock_irqrestore(&alarm_slock, flags);
	219	return -EBUSY;
	220	}
	221	alarm_opened = 1;
	222	file->private_data = (void *)1;
	223	spin_unlock_irqrestore(&alarm_slock, flags);
	224	}
	225	}
	226
	227	switch (ANDROID_ALARM_BASE_CMD(cmd)) {
	228	case ANDROID_ALARM_CLEAR(0):
cec8bb73	229	alarm_clear(alarm_type);
841cb11c	230	break;
841cb11c	231	case ANDROID_ALARM_SET(0):
cec8bb73 JS	232	alarm_set(alarm_type, ts);
	233	break;
	234	case ANDROID_ALARM_SET_AND_WAIT(0):
	235	alarm_set(alarm_type, ts);
841cb11c AH	236	/* fall though */
841cb11c AH	237	case ANDROID_ALARM_WAIT:
cec8bb73	238	rv = alarm_wait();
841cb11c AH	239	break;
841cb11c AH	240	case ANDROID_ALARM_SET_RTC:
cec8bb73	241	rv = alarm_set_rtc(ts);
841cb11c AH	242	break;
841cb11c AH	243	case ANDROID_ALARM_GET_TIME(0):
cec8bb73	244	rv = alarm_get_time(alarm_type, ts);
841cb11c AH	245	break;
	246
	247	default:
	248	rv = -EINVAL;
841cb11c	249	}
cec8bb73 JS	250	return rv;
	251	}
	252
	253	static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	254	{
	255
	256	struct timespec ts;
	257	int rv;
	258
	259	switch (ANDROID_ALARM_BASE_CMD(cmd)) {
	260	case ANDROID_ALARM_SET_AND_WAIT(0):
	261	case ANDROID_ALARM_SET(0):
	262	case ANDROID_ALARM_SET_RTC:
	263	if (copy_from_user(&ts, (void __user *)arg, sizeof(ts)))
	264	return -EFAULT;
	265	break;
	266	}
	267
	268	rv = alarm_do_ioctl(file, cmd, &ts);
e919b86c DC	269	if (rv)
e919b86c DC	270	return rv;
cec8bb73 JS	271
	272	switch (ANDROID_ALARM_BASE_CMD(cmd)) {
	273	case ANDROID_ALARM_GET_TIME(0):
	274	if (copy_to_user((void __user *)arg, &ts, sizeof(ts)))
	275	return -EFAULT;
	276	break;
	277	}
	278
e919b86c	279	return 0;
841cb11c	280	}
5230a5f5	281
532572b9 JS	282	#ifdef CONFIG_COMPAT
	283	static long alarm_compat_ioctl(struct file *file, unsigned int cmd,
	284	unsigned long arg)
	285	{
	286
	287	struct timespec ts;
	288	int rv;
	289
	290	switch (ANDROID_ALARM_BASE_CMD(cmd)) {
	291	case ANDROID_ALARM_SET_AND_WAIT_COMPAT(0):
	292	case ANDROID_ALARM_SET_COMPAT(0):
	293	case ANDROID_ALARM_SET_RTC_COMPAT:
	294	if (compat_get_timespec(&ts, (void __user *)arg))
	295	return -EFAULT;
	296	/* fall through */
	297	case ANDROID_ALARM_GET_TIME_COMPAT(0):
	298	cmd = ANDROID_ALARM_COMPAT_TO_NORM(cmd);
	299	break;
	300	}
	301
	302	rv = alarm_do_ioctl(file, cmd, &ts);
60bba385 DC	303	if (rv)
60bba385 DC	304	return rv;
532572b9 JS	305
	306	switch (ANDROID_ALARM_BASE_CMD(cmd)) {
	307	case ANDROID_ALARM_GET_TIME(0): /* NOTE: we modified cmd above */
	308	if (compat_put_timespec(&ts, (void __user *)arg))
	309	return -EFAULT;
	310	break;
	311	}
	312
60bba385	313	return 0;
532572b9 JS	314	}
532572b9 JS	315	#endif
841cb11c AH	316
	317	static int alarm_open(struct inode inode, struct file file)
	318	{
	319	file->private_data = NULL;
	320	return 0;
	321	}
	322
	323	static int alarm_release(struct inode inode, struct file file)
	324	{
	325	int i;
	326	unsigned long flags;
	327
	328	spin_lock_irqsave(&alarm_slock, flags);
592314e9	329	if (file->private_data) {
841cb11c AH	330	for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
	331	uint32_t alarm_type_mask = 1U << i;
	332	if (alarm_enabled & alarm_type_mask) {
8a7245ea JP	333	alarm_dbg(INFO,
	334	"%s: clear alarm, pending %d\n",
	335	__func__,
	336	!!(alarm_pending & alarm_type_mask));
841cb11c AH	337	alarm_enabled &= ~alarm_type_mask;
	338	}
	339	spin_unlock_irqrestore(&alarm_slock, flags);
b8793260	340	devalarm_cancel(&alarms[i]);
841cb11c AH	341	spin_lock_irqsave(&alarm_slock, flags);
	342	}
	343	if (alarm_pending \| wait_pending) {
	344	if (alarm_pending)
8a7245ea JP	345	alarm_dbg(INFO, "%s: clear pending alarms %x\n",
8a7245ea JP	346	__func__, alarm_pending);
a180c0d6	347	__pm_relax(&alarm_wake_lock);
841cb11c AH	348	wait_pending = 0;
	349	alarm_pending = 0;
	350	}
	351	alarm_opened = 0;
	352	}
	353	spin_unlock_irqrestore(&alarm_slock, flags);
	354	return 0;
	355	}
	356
b8793260	357	static void devalarm_triggered(struct devalarm *alarm)
841cb11c AH	358	{
	359	unsigned long flags;
	360	uint32_t alarm_type_mask = 1U << alarm->type;
	361
8a7245ea	362	alarm_dbg(INT, "%s: type %d\n", __func__, alarm->type);
841cb11c AH	363	spin_lock_irqsave(&alarm_slock, flags);
841cb11c AH	364	if (alarm_enabled & alarm_type_mask) {
a180c0d6	365	__pm_wakeup_event(&alarm_wake_lock, 5000); /* 5secs */
841cb11c AH	366	alarm_enabled &= ~alarm_type_mask;
	367	alarm_pending \|= alarm_type_mask;
	368	wake_up(&alarm_wait_queue);
	369	}
	370	spin_unlock_irqrestore(&alarm_slock, flags);
	371	}
	372
b8793260 JS	373	static enum hrtimer_restart devalarm_hrthandler(struct hrtimer *hrt)
	374	{
	375	struct devalarm *devalrm = container_of(hrt, struct devalarm, u.hrt);
	376
	377	devalarm_triggered(devalrm);
	378	return HRTIMER_NORESTART;
	379	}
	380
	381	static enum alarmtimer_restart devalarm_alarmhandler(struct alarm *alrm,
	382	ktime_t now)
	383	{
	384	struct devalarm *devalrm = container_of(alrm, struct devalarm, u.alrm);
	385
	386	devalarm_triggered(devalrm);
	387	return ALARMTIMER_NORESTART;
	388	}
	389
	390
841cb11c AH	391	static const struct file_operations alarm_fops = {
	392	.owner = THIS_MODULE,
	393	.unlocked_ioctl = alarm_ioctl,
	394	.open = alarm_open,
	395	.release = alarm_release,
532572b9 JS	396	#ifdef CONFIG_COMPAT
	397	.compat_ioctl = alarm_compat_ioctl,
	398	#endif
841cb11c AH	399	};
	400
	401	static struct miscdevice alarm_device = {
	402	.minor = MISC_DYNAMIC_MINOR,
	403	.name = "alarm",
	404	.fops = &alarm_fops,
	405	};
	406
	407	static int __init alarm_dev_init(void)
	408	{
	409	int err;
	410	int i;
	411
	412	err = misc_register(&alarm_device);
	413	if (err)
	414	return err;
	415
b8793260 JS	416	alarm_init(&alarms[ANDROID_ALARM_RTC_WAKEUP].u.alrm,
	417	ALARM_REALTIME, devalarm_alarmhandler);
	418	hrtimer_init(&alarms[ANDROID_ALARM_RTC].u.hrt,
	419	CLOCK_REALTIME, HRTIMER_MODE_ABS);
	420	alarm_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].u.alrm,
	421	ALARM_BOOTTIME, devalarm_alarmhandler);
	422	hrtimer_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME].u.hrt,
	423	CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
	424	hrtimer_init(&alarms[ANDROID_ALARM_SYSTEMTIME].u.hrt,
	425	CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
	426
	427	for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
	428	alarms[i].type = i;
	429	if (!is_wakeup(i))
	430	alarms[i].u.hrt.function = devalarm_hrthandler;
	431	}
	432
a180c0d6	433	wakeup_source_init(&alarm_wake_lock, "alarm");
841cb11c AH	434	return 0;
	435	}
	436
	437	static void __exit alarm_dev_exit(void)
	438	{
	439	misc_deregister(&alarm_device);
a180c0d6	440	wakeup_source_trash(&alarm_wake_lock);
841cb11c AH	441	}
	442
	443	module_init(alarm_dev_init);
	444	module_exit(alarm_dev_exit);
	445