[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];


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);

	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 rv;
}
#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
	63
	64	static int is_wakeup(enum android_alarm_type type)
	65	{
147cd165 DK	66	return (type == ANDROID_ALARM_RTC_WAKEUP \|\|
147cd165 DK	67	type == ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP);
b8793260 JS	68	}
	69
	70
	71	static void devalarm_start(struct devalarm *alrm, ktime_t exp)
	72	{
	73	if (is_wakeup(alrm->type))
	74	alarm_start(&alrm->u.alrm, exp);
	75	else
	76	hrtimer_start(&alrm->u.hrt, exp, HRTIMER_MODE_ABS);
	77	}
	78
	79
	80	static int devalarm_try_to_cancel(struct devalarm *alrm)
	81	{
b8793260	82	if (is_wakeup(alrm->type))
147cd165 DK	83	return alarm_try_to_cancel(&alrm->u.alrm);
147cd165 DK	84	return hrtimer_try_to_cancel(&alrm->u.hrt);
b8793260 JS	85	}
	86
	87	static void devalarm_cancel(struct devalarm *alrm)
	88	{
	89	if (is_wakeup(alrm->type))
	90	alarm_cancel(&alrm->u.alrm);
	91	else
	92	hrtimer_cancel(&alrm->u.hrt);
	93	}
	94
cec8bb73 JS	95	static void alarm_clear(enum android_alarm_type alarm_type)
	96	{
	97	uint32_t alarm_type_mask = 1U << alarm_type;
	98	unsigned long flags;
841cb11c	99
cec8bb73 JS	100	spin_lock_irqsave(&alarm_slock, flags);
	101	alarm_dbg(IO, "alarm %d clear\n", alarm_type);
	102	devalarm_try_to_cancel(&alarms[alarm_type]);
	103	if (alarm_pending) {
	104	alarm_pending &= ~alarm_type_mask;
	105	if (!alarm_pending && !wait_pending)
	106	__pm_relax(&alarm_wake_lock);
	107	}
	108	alarm_enabled &= ~alarm_type_mask;
	109	spin_unlock_irqrestore(&alarm_slock, flags);
	110
	111	}
	112
	113	static void alarm_set(enum android_alarm_type alarm_type,
	114	struct timespec *ts)
841cb11c	115	{
cec8bb73	116	uint32_t alarm_type_mask = 1U << alarm_type;
841cb11c	117	unsigned long flags;
cec8bb73 JS	118
	119	spin_lock_irqsave(&alarm_slock, flags);
	120	alarm_dbg(IO, "alarm %d set %ld.%09ld\n",
	121	alarm_type, ts->tv_sec, ts->tv_nsec);
	122	alarm_enabled \|= alarm_type_mask;
	123	devalarm_start(&alarms[alarm_type], timespec_to_ktime(*ts));
	124	spin_unlock_irqrestore(&alarm_slock, flags);
	125	}
	126
	127	static int alarm_wait(void)
	128	{
	129	unsigned long flags;
	130	int rv = 0;
	131
	132	spin_lock_irqsave(&alarm_slock, flags);
	133	alarm_dbg(IO, "alarm wait\n");
	134	if (!alarm_pending && wait_pending) {
	135	__pm_relax(&alarm_wake_lock);
	136	wait_pending = 0;
	137	}
	138	spin_unlock_irqrestore(&alarm_slock, flags);
	139
	140	rv = wait_event_interruptible(alarm_wait_queue, alarm_pending);
	141	if (rv)
	142	return rv;
	143
	144	spin_lock_irqsave(&alarm_slock, flags);
	145	rv = alarm_pending;
	146	wait_pending = 1;
	147	alarm_pending = 0;
	148	spin_unlock_irqrestore(&alarm_slock, flags);
	149
	150	return rv;
	151	}
	152
	153	static int alarm_set_rtc(struct timespec *ts)
	154	{
b8793260 JS	155	struct rtc_time new_rtc_tm;
b8793260 JS	156	struct rtc_device *rtc_dev;
cec8bb73 JS	157	unsigned long flags;
	158	int rv = 0;
	159
	160	rtc_time_to_tm(ts->tv_sec, &new_rtc_tm);
	161	rtc_dev = alarmtimer_get_rtcdev();
	162	rv = do_settimeofday(ts);
	163	if (rv < 0)
	164	return rv;
	165	if (rtc_dev)
	166	rv = rtc_set_time(rtc_dev, &new_rtc_tm);
	167
	168	spin_lock_irqsave(&alarm_slock, flags);
	169	alarm_pending \|= ANDROID_ALARM_TIME_CHANGE_MASK;
	170	wake_up(&alarm_wait_queue);
	171	spin_unlock_irqrestore(&alarm_slock, flags);
	172
	173	return rv;
	174	}
	175
	176	static int alarm_get_time(enum android_alarm_type alarm_type,
	177	struct timespec *ts)
	178	{
	179	int rv = 0;
	180
	181	switch (alarm_type) {
	182	case ANDROID_ALARM_RTC_WAKEUP:
	183	case ANDROID_ALARM_RTC:
	184	getnstimeofday(ts);
	185	break;
	186	case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP:
	187	case ANDROID_ALARM_ELAPSED_REALTIME:
	188	get_monotonic_boottime(ts);
	189	break;
	190	case ANDROID_ALARM_SYSTEMTIME:
	191	ktime_get_ts(ts);
	192	break;
	193	default:
	194	rv = -EINVAL;
	195	}
	196	return rv;
	197	}
	198
	199	static long alarm_do_ioctl(struct file *file, unsigned int cmd,
	200	struct timespec *ts)
	201	{
	202	int rv = 0;
	203	unsigned long flags;
841cb11c	204	enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd);
841cb11c AH	205
	206	if (alarm_type >= ANDROID_ALARM_TYPE_COUNT)
	207	return -EINVAL;
	208
	209	if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) {
	210	if ((file->f_flags & O_ACCMODE) == O_RDONLY)
	211	return -EPERM;
	212	if (file->private_data == NULL &&
	213	cmd != ANDROID_ALARM_SET_RTC) {
	214	spin_lock_irqsave(&alarm_slock, flags);
	215	if (alarm_opened) {
	216	spin_unlock_irqrestore(&alarm_slock, flags);
	217	return -EBUSY;
	218	}
	219	alarm_opened = 1;
	220	file->private_data = (void *)1;
	221	spin_unlock_irqrestore(&alarm_slock, flags);
	222	}
	223	}
	224
	225	switch (ANDROID_ALARM_BASE_CMD(cmd)) {
	226	case ANDROID_ALARM_CLEAR(0):
cec8bb73	227	alarm_clear(alarm_type);
841cb11c	228	break;
841cb11c	229	case ANDROID_ALARM_SET(0):
cec8bb73 JS	230	alarm_set(alarm_type, ts);
	231	break;
	232	case ANDROID_ALARM_SET_AND_WAIT(0):
	233	alarm_set(alarm_type, ts);
841cb11c AH	234	/* fall though */
841cb11c AH	235	case ANDROID_ALARM_WAIT:
cec8bb73	236	rv = alarm_wait();
841cb11c AH	237	break;
841cb11c AH	238	case ANDROID_ALARM_SET_RTC:
cec8bb73	239	rv = alarm_set_rtc(ts);
841cb11c AH	240	break;
841cb11c AH	241	case ANDROID_ALARM_GET_TIME(0):
cec8bb73	242	rv = alarm_get_time(alarm_type, ts);
841cb11c AH	243	break;
	244
	245	default:
	246	rv = -EINVAL;
841cb11c	247	}
cec8bb73 JS	248	return rv;
	249	}
	250
	251	static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	252	{
	253
	254	struct timespec ts;
	255	int rv;
	256
	257	switch (ANDROID_ALARM_BASE_CMD(cmd)) {
	258	case ANDROID_ALARM_SET_AND_WAIT(0):
	259	case ANDROID_ALARM_SET(0):
	260	case ANDROID_ALARM_SET_RTC:
	261	if (copy_from_user(&ts, (void __user *)arg, sizeof(ts)))
	262	return -EFAULT;
	263	break;
	264	}
	265
	266	rv = alarm_do_ioctl(file, cmd, &ts);
e919b86c DC	267	if (rv)
e919b86c DC	268	return rv;
cec8bb73 JS	269
	270	switch (ANDROID_ALARM_BASE_CMD(cmd)) {
	271	case ANDROID_ALARM_GET_TIME(0):
	272	if (copy_to_user((void __user *)arg, &ts, sizeof(ts)))
	273	return -EFAULT;
	274	break;
	275	}
	276
e919b86c	277	return 0;
841cb11c	278	}
532572b9 JS	279	#ifdef CONFIG_COMPAT
	280	static long alarm_compat_ioctl(struct file *file, unsigned int cmd,
	281	unsigned long arg)
	282	{
	283
	284	struct timespec ts;
	285	int rv;
	286
	287	switch (ANDROID_ALARM_BASE_CMD(cmd)) {
	288	case ANDROID_ALARM_SET_AND_WAIT_COMPAT(0):
	289	case ANDROID_ALARM_SET_COMPAT(0):
	290	case ANDROID_ALARM_SET_RTC_COMPAT:
	291	if (compat_get_timespec(&ts, (void __user *)arg))
	292	return -EFAULT;
	293	/* fall through */
	294	case ANDROID_ALARM_GET_TIME_COMPAT(0):
	295	cmd = ANDROID_ALARM_COMPAT_TO_NORM(cmd);
	296	break;
	297	}
	298
	299	rv = alarm_do_ioctl(file, cmd, &ts);
	300
	301	switch (ANDROID_ALARM_BASE_CMD(cmd)) {
	302	case ANDROID_ALARM_GET_TIME(0): /* NOTE: we modified cmd above */
	303	if (compat_put_timespec(&ts, (void __user *)arg))
	304	return -EFAULT;
	305	break;
	306	}
	307
	308	return rv;
	309	}
	310	#endif
841cb11c AH	311
	312	static int alarm_open(struct inode inode, struct file file)
	313	{
	314	file->private_data = NULL;
	315	return 0;
	316	}
	317
	318	static int alarm_release(struct inode inode, struct file file)
	319	{
	320	int i;
	321	unsigned long flags;
	322
	323	spin_lock_irqsave(&alarm_slock, flags);
592314e9	324	if (file->private_data) {
841cb11c AH	325	for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
	326	uint32_t alarm_type_mask = 1U << i;
	327	if (alarm_enabled & alarm_type_mask) {
8a7245ea JP	328	alarm_dbg(INFO,
	329	"%s: clear alarm, pending %d\n",
	330	__func__,
	331	!!(alarm_pending & alarm_type_mask));
841cb11c AH	332	alarm_enabled &= ~alarm_type_mask;
	333	}
	334	spin_unlock_irqrestore(&alarm_slock, flags);
b8793260	335	devalarm_cancel(&alarms[i]);
841cb11c AH	336	spin_lock_irqsave(&alarm_slock, flags);
	337	}
	338	if (alarm_pending \| wait_pending) {
	339	if (alarm_pending)
8a7245ea JP	340	alarm_dbg(INFO, "%s: clear pending alarms %x\n",
8a7245ea JP	341	__func__, alarm_pending);
a180c0d6	342	__pm_relax(&alarm_wake_lock);
841cb11c AH	343	wait_pending = 0;
	344	alarm_pending = 0;
	345	}
	346	alarm_opened = 0;
	347	}
	348	spin_unlock_irqrestore(&alarm_slock, flags);
	349	return 0;
	350	}
	351
b8793260	352	static void devalarm_triggered(struct devalarm *alarm)
841cb11c AH	353	{
	354	unsigned long flags;
	355	uint32_t alarm_type_mask = 1U << alarm->type;
	356
8a7245ea	357	alarm_dbg(INT, "%s: type %d\n", __func__, alarm->type);
841cb11c AH	358	spin_lock_irqsave(&alarm_slock, flags);
841cb11c AH	359	if (alarm_enabled & alarm_type_mask) {
a180c0d6	360	__pm_wakeup_event(&alarm_wake_lock, 5000); /* 5secs */
841cb11c AH	361	alarm_enabled &= ~alarm_type_mask;
	362	alarm_pending \|= alarm_type_mask;
	363	wake_up(&alarm_wait_queue);
	364	}
	365	spin_unlock_irqrestore(&alarm_slock, flags);
	366	}
	367
b8793260 JS	368
	369	static enum hrtimer_restart devalarm_hrthandler(struct hrtimer *hrt)
	370	{
	371	struct devalarm *devalrm = container_of(hrt, struct devalarm, u.hrt);
	372
	373	devalarm_triggered(devalrm);
	374	return HRTIMER_NORESTART;
	375	}
	376
	377	static enum alarmtimer_restart devalarm_alarmhandler(struct alarm *alrm,
	378	ktime_t now)
	379	{
	380	struct devalarm *devalrm = container_of(alrm, struct devalarm, u.alrm);
	381
	382	devalarm_triggered(devalrm);
	383	return ALARMTIMER_NORESTART;
	384	}
	385
	386
841cb11c AH	387	static const struct file_operations alarm_fops = {
	388	.owner = THIS_MODULE,
	389	.unlocked_ioctl = alarm_ioctl,
	390	.open = alarm_open,
	391	.release = alarm_release,
532572b9 JS	392	#ifdef CONFIG_COMPAT
	393	.compat_ioctl = alarm_compat_ioctl,
	394	#endif
841cb11c AH	395	};
	396
	397	static struct miscdevice alarm_device = {
	398	.minor = MISC_DYNAMIC_MINOR,
	399	.name = "alarm",
	400	.fops = &alarm_fops,
	401	};
	402
	403	static int __init alarm_dev_init(void)
	404	{
	405	int err;
	406	int i;
	407
	408	err = misc_register(&alarm_device);
	409	if (err)
	410	return err;
	411
b8793260 JS	412	alarm_init(&alarms[ANDROID_ALARM_RTC_WAKEUP].u.alrm,
	413	ALARM_REALTIME, devalarm_alarmhandler);
	414	hrtimer_init(&alarms[ANDROID_ALARM_RTC].u.hrt,
	415	CLOCK_REALTIME, HRTIMER_MODE_ABS);
	416	alarm_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].u.alrm,
	417	ALARM_BOOTTIME, devalarm_alarmhandler);
	418	hrtimer_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME].u.hrt,
	419	CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
	420	hrtimer_init(&alarms[ANDROID_ALARM_SYSTEMTIME].u.hrt,
	421	CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
	422
	423	for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
	424	alarms[i].type = i;
	425	if (!is_wakeup(i))
	426	alarms[i].u.hrt.function = devalarm_hrthandler;
	427	}
	428
a180c0d6	429	wakeup_source_init(&alarm_wake_lock, "alarm");
841cb11c AH	430	return 0;
	431	}
	432
	433	static void __exit alarm_dev_exit(void)
	434	{
	435	misc_deregister(&alarm_device);
a180c0d6	436	wakeup_source_trash(&alarm_wake_lock);
841cb11c AH	437	}
	438
	439	module_init(alarm_dev_init);
	440	module_exit(alarm_dev_exit);
	441