/* 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_COMPATstatic 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);