/* 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 pr_alarm(debug_level_mask, args...) \	do { \		if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) { \			pr_info(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){	if (type == ANDROID_ALARM_RTC_WAKEUP ||			type == ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP)		return 1;	return 0;}  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){	int ret;	if (is_wakeup(alrm->type))		ret = alarm_try_to_cancel(&alrm->u.alrm);	else		ret = hrtimer_try_to_cancel(&alrm->u.hrt);	return ret;} 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);		pr_alarm(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);		pr_alarm(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);		pr_alarm(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_TYPE_COUNT:		case ANDROID_ALARM_SYSTEMTIME:			ktime_get_ts(&tmp_time);			break;		}		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) {				pr_alarm(INFO, "alarm_release: clear alarm, "					"pending %d\n",					!!(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)				pr_alarm(INFO, "alarm_release: clear "					"pending alarms %x\n", 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; 	pr_alarm(INT, "devalarm_triggered type %d\n", 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);