[linux-2.6-block.git] / drivers / rtc / rtc-dev.c

/*
 * RTC subsystem, dev interface
 *
 * Copyright (C) 2005 Tower Technologies
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 *
 * based on arch/arm/common/rtctime.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/sched.h>
#include "rtc-core.h"

static dev_t rtc_devt;

#define RTC_DEV_MAX 16 /* 16 RTCs should be enough for everyone... */

static int rtc_dev_open(struct inode *inode, struct file *file)
{
	int err;
	struct rtc_device *rtc = container_of(inode->i_cdev,
					struct rtc_device, char_dev);
	const struct rtc_class_ops *ops = rtc->ops;

	if (test_and_set_bit_lock(RTC_DEV_BUSY, &rtc->flags))
		return -EBUSY;

	file->private_data = rtc;

	err = ops->open ? ops->open(rtc->dev.parent) : 0;
	if (err == 0) {
		spin_lock_irq(&rtc->irq_lock);
		rtc->irq_data = 0;
		spin_unlock_irq(&rtc->irq_lock);

		return 0;
	}

	/* something has gone wrong */
	clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
	return err;
}


static ssize_t
rtc_dev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
	struct rtc_device *rtc = file->private_data;

	DECLARE_WAITQUEUE(wait, current);
	unsigned long data;
	ssize_t ret;

	if (count != sizeof(unsigned int) && count < sizeof(unsigned long))
		return -EINVAL;

	add_wait_queue(&rtc->irq_queue, &wait);
	do {
		__set_current_state(TASK_INTERRUPTIBLE);

		spin_lock_irq(&rtc->irq_lock);
		data = rtc->irq_data;
		rtc->irq_data = 0;
		spin_unlock_irq(&rtc->irq_lock);

		if (data != 0) {
			ret = 0;
			break;
		}
		if (file->f_flags & O_NONBLOCK) {
			ret = -EAGAIN;
			break;
		}
		if (signal_pending(current)) {
			ret = -ERESTARTSYS;
			break;
		}
		schedule();
	} while (1);
	set_current_state(TASK_RUNNING);
	remove_wait_queue(&rtc->irq_queue, &wait);

	if (ret == 0) {
		/* Check for any data updates */
		if (rtc->ops->read_callback)
			data = rtc->ops->read_callback(rtc->dev.parent,
						       data);

		if (sizeof(int) != sizeof(long) &&
		    count == sizeof(unsigned int))
			ret = put_user(data, (unsigned int __user *)buf) ?:
				sizeof(unsigned int);
		else
			ret = put_user(data, (unsigned long __user *)buf) ?:
				sizeof(unsigned long);
	}
	return ret;
}

static unsigned int rtc_dev_poll(struct file *file, poll_table *wait)
{
	struct rtc_device *rtc = file->private_data;
	unsigned long data;

	poll_wait(file, &rtc->irq_queue, wait);

	data = rtc->irq_data;

	return (data != 0) ? (POLLIN | POLLRDNORM) : 0;
}

static long rtc_dev_ioctl(struct file *file,
		unsigned int cmd, unsigned long arg)
{
	int err = 0;
	struct rtc_device *rtc = file->private_data;
	const struct rtc_class_ops *ops = rtc->ops;
	struct rtc_time tm;
	struct rtc_wkalrm alarm;
	void __user *uarg = (void __user *) arg;

	err = mutex_lock_interruptible(&rtc->ops_lock);
	if (err)
		return err;

	/* check that the calling task has appropriate permissions
	 * for certain ioctls. doing this check here is useful
	 * to avoid duplicate code in each driver.
	 */
	switch (cmd) {
	case RTC_EPOCH_SET:
	case RTC_SET_TIME:
		if (!capable(CAP_SYS_TIME))
			err = -EACCES;
		break;

	case RTC_IRQP_SET:
		if (arg > rtc->max_user_freq && !capable(CAP_SYS_RESOURCE))
			err = -EACCES;
		break;

	case RTC_PIE_ON:
		if (rtc->irq_freq > rtc->max_user_freq &&
				!capable(CAP_SYS_RESOURCE))
			err = -EACCES;
		break;
	}

	if (err)
		goto done;

	/*
	 * Drivers *SHOULD NOT* provide ioctl implementations
	 * for these requests.  Instead, provide methods to
	 * support the following code, so that the RTC's main
	 * features are accessible without using ioctls.
	 *
	 * RTC and alarm times will be in UTC, by preference,
	 * but dual-booting with MS-Windows implies RTCs must
	 * use the local wall clock time.
	 */

	switch (cmd) {
	case RTC_ALM_READ:
		mutex_unlock(&rtc->ops_lock);

		err = rtc_read_alarm(rtc, &alarm);
		if (err < 0)
			return err;

		if (copy_to_user(uarg, &alarm.time, sizeof(tm)))
			err = -EFAULT;
		return err;

	case RTC_ALM_SET:
		mutex_unlock(&rtc->ops_lock);

		if (copy_from_user(&alarm.time, uarg, sizeof(tm)))
			return -EFAULT;

		alarm.enabled = 0;
		alarm.pending = 0;
		alarm.time.tm_wday = -1;
		alarm.time.tm_yday = -1;
		alarm.time.tm_isdst = -1;

		/* RTC_ALM_SET alarms may be up to 24 hours in the future.
		 * Rather than expecting every RTC to implement "don't care"
		 * for day/month/year fields, just force the alarm to have
		 * the right values for those fields.
		 *
		 * RTC_WKALM_SET should be used instead.  Not only does it
		 * eliminate the need for a separate RTC_AIE_ON call, it
		 * doesn't have the "alarm 23:59:59 in the future" race.
		 *
		 * NOTE:  some legacy code may have used invalid fields as
		 * wildcards, exposing hardware "periodic alarm" capabilities.
		 * Not supported here.
		 */
		{
			unsigned long now, then;

			err = rtc_read_time(rtc, &tm);
			if (err < 0)
				return err;
			rtc_tm_to_time(&tm, &now);

			alarm.time.tm_mday = tm.tm_mday;
			alarm.time.tm_mon = tm.tm_mon;
			alarm.time.tm_year = tm.tm_year;
			err  = rtc_valid_tm(&alarm.time);
			if (err < 0)
				return err;
			rtc_tm_to_time(&alarm.time, &then);

			/* alarm may need to wrap into tomorrow */
			if (then < now) {
				rtc_time_to_tm(now + 24 * 60 * 60, &tm);
				alarm.time.tm_mday = tm.tm_mday;
				alarm.time.tm_mon = tm.tm_mon;
				alarm.time.tm_year = tm.tm_year;
			}
		}

		return rtc_set_alarm(rtc, &alarm);

	case RTC_RD_TIME:
		mutex_unlock(&rtc->ops_lock);

		err = rtc_read_time(rtc, &tm);
		if (err < 0)
			return err;

		if (copy_to_user(uarg, &tm, sizeof(tm)))
			err = -EFAULT;
		return err;

	case RTC_SET_TIME:
		mutex_unlock(&rtc->ops_lock);

		if (copy_from_user(&tm, uarg, sizeof(tm)))
			return -EFAULT;

		return rtc_set_time(rtc, &tm);

	case RTC_PIE_ON:
		err = rtc_irq_set_state(rtc, NULL, 1);
		break;

	case RTC_PIE_OFF:
		err = rtc_irq_set_state(rtc, NULL, 0);
		break;

	case RTC_AIE_ON:
		mutex_unlock(&rtc->ops_lock);
		return rtc_alarm_irq_enable(rtc, 1);

	case RTC_AIE_OFF:
		mutex_unlock(&rtc->ops_lock);
		return rtc_alarm_irq_enable(rtc, 0);

	case RTC_UIE_ON:
		mutex_unlock(&rtc->ops_lock);
		return rtc_update_irq_enable(rtc, 1);

	case RTC_UIE_OFF:
		mutex_unlock(&rtc->ops_lock);
		return rtc_update_irq_enable(rtc, 0);

	case RTC_IRQP_SET:
		err = rtc_irq_set_freq(rtc, NULL, arg);
		break;

	case RTC_IRQP_READ:
		err = put_user(rtc->irq_freq, (unsigned long __user *)uarg);
		break;

#if 0
	case RTC_EPOCH_SET:
#ifndef rtc_epoch
		/*
		 * There were no RTC clocks before 1900.
		 */
		if (arg < 1900) {
			err = -EINVAL;
			break;
		}
		rtc_epoch = arg;
		err = 0;
#endif
		break;

	case RTC_EPOCH_READ:
		err = put_user(rtc_epoch, (unsigned long __user *)uarg);
		break;
#endif
	case RTC_WKALM_SET:
		mutex_unlock(&rtc->ops_lock);
		if (copy_from_user(&alarm, uarg, sizeof(alarm)))
			return -EFAULT;

		return rtc_set_alarm(rtc, &alarm);

	case RTC_WKALM_RD:
		mutex_unlock(&rtc->ops_lock);
		err = rtc_read_alarm(rtc, &alarm);
		if (err < 0)
			return err;

		if (copy_to_user(uarg, &alarm, sizeof(alarm)))
			err = -EFAULT;
		return err;

	default:
		/* Finally try the driver's ioctl interface */
		if (ops->ioctl) {
			err = ops->ioctl(rtc->dev.parent, cmd, arg);
			if (err == -ENOIOCTLCMD)
				err = -ENOTTY;
		}
		break;
	}

done:
	mutex_unlock(&rtc->ops_lock);
	return err;
}

static int rtc_dev_fasync(int fd, struct file *file, int on)
{
	struct rtc_device *rtc = file->private_data;
	return fasync_helper(fd, file, on, &rtc->async_queue);
}

static int rtc_dev_release(struct inode *inode, struct file *file)
{
	struct rtc_device *rtc = file->private_data;

	/* We shut down the repeating IRQs that userspace enabled,
	 * since nothing is listening to them.
	 *  - Update (UIE) ... currently only managed through ioctls
	 *  - Periodic (PIE) ... also used through rtc_*() interface calls
	 *
	 * Leave the alarm alone; it may be set to trigger a system wakeup
	 * later, or be used by kernel code, and is a one-shot event anyway.
	 */

	/* Keep ioctl until all drivers are converted */
	rtc_dev_ioctl(file, RTC_UIE_OFF, 0);
	rtc_update_irq_enable(rtc, 0);
	rtc_irq_set_state(rtc, NULL, 0);

	if (rtc->ops->release)
		rtc->ops->release(rtc->dev.parent);

	clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
	return 0;
}

static const struct file_operations rtc_dev_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.read		= rtc_dev_read,
	.poll		= rtc_dev_poll,
	.unlocked_ioctl	= rtc_dev_ioctl,
	.open		= rtc_dev_open,
	.release	= rtc_dev_release,
	.fasync		= rtc_dev_fasync,
};

/* insertion/removal hooks */

void rtc_dev_prepare(struct rtc_device *rtc)
{
	if (!rtc_devt)
		return;

	if (rtc->id >= RTC_DEV_MAX) {
		pr_debug("%s: too many RTC devices\n", rtc->name);
		return;
	}

	rtc->dev.devt = MKDEV(MAJOR(rtc_devt), rtc->id);

	cdev_init(&rtc->char_dev, &rtc_dev_fops);
	rtc->char_dev.owner = rtc->owner;
}

void rtc_dev_add_device(struct rtc_device *rtc)
{
	if (cdev_add(&rtc->char_dev, rtc->dev.devt, 1))
		printk(KERN_WARNING "%s: failed to add char device %d:%d\n",
			rtc->name, MAJOR(rtc_devt), rtc->id);
	else
		pr_debug("%s: dev (%d:%d)\n", rtc->name,
			MAJOR(rtc_devt), rtc->id);
}

void rtc_dev_del_device(struct rtc_device *rtc)
{
	if (rtc->dev.devt)
		cdev_del(&rtc->char_dev);
}

void __init rtc_dev_init(void)
{
	int err;

	err = alloc_chrdev_region(&rtc_devt, 0, RTC_DEV_MAX, "rtc");
	if (err < 0)
		printk(KERN_ERR "%s: failed to allocate char dev region\n",
			__FILE__);
}

void __exit rtc_dev_exit(void)
{
	if (rtc_devt)
		unregister_chrdev_region(rtc_devt, RTC_DEV_MAX);
}
Commit	Line	Data
e824290e AZ	1	/*
	2	* RTC subsystem, dev interface
	3	*
	4	* Copyright (C) 2005 Tower Technologies
	5	* Author: Alessandro Zummo <a.zummo@towertech.it>
	6	*
	7	* based on arch/arm/common/rtctime.c
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/rtc.h>
d43c36dc	16	#include <linux/sched.h>
5726fb20	17	#include "rtc-core.h"
e824290e	18
e824290e AZ	19	static dev_t rtc_devt;
	20
	21	#define RTC_DEV_MAX 16 /* 16 RTCs should be enough for everyone... */
	22
	23	static int rtc_dev_open(struct inode inode, struct file file)
	24	{
	25	int err;
	26	struct rtc_device *rtc = container_of(inode->i_cdev,
	27	struct rtc_device, char_dev);
ff8371ac	28	const struct rtc_class_ops *ops = rtc->ops;
e824290e	29
b1c3c898 DB	30	if (test_and_set_bit_lock(RTC_DEV_BUSY, &rtc->flags))
b1c3c898 DB	31	return -EBUSY;
e824290e	32
ab6a2d70	33	file->private_data = rtc;
e824290e	34
cd966209	35	err = ops->open ? ops->open(rtc->dev.parent) : 0;
e824290e AZ	36	if (err == 0) {
	37	spin_lock_irq(&rtc->irq_lock);
	38	rtc->irq_data = 0;
	39	spin_unlock_irq(&rtc->irq_lock);
	40
b1c3c898	41	return 0;
e824290e AZ	42	}
e824290e AZ	43
8853c202	44	/* something has gone wrong */
372a302e	45	clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
e824290e AZ	46	return err;
	47	}
	48
	49
	50	static ssize_t
	51	rtc_dev_read(struct file file, char __user buf, size_t count, loff_t *ppos)
	52	{
88efe137	53	struct rtc_device *rtc = file->private_data;
e824290e AZ	54
	55	DECLARE_WAITQUEUE(wait, current);
	56	unsigned long data;
	57	ssize_t ret;
	58
3418ff76	59	if (count != sizeof(unsigned int) && count < sizeof(unsigned long))
e824290e AZ	60	return -EINVAL;
	61
	62	add_wait_queue(&rtc->irq_queue, &wait);
	63	do {
	64	__set_current_state(TASK_INTERRUPTIBLE);
	65
	66	spin_lock_irq(&rtc->irq_lock);
	67	data = rtc->irq_data;
	68	rtc->irq_data = 0;
	69	spin_unlock_irq(&rtc->irq_lock);
	70
	71	if (data != 0) {
	72	ret = 0;
	73	break;
	74	}
	75	if (file->f_flags & O_NONBLOCK) {
	76	ret = -EAGAIN;
	77	break;
	78	}
	79	if (signal_pending(current)) {
	80	ret = -ERESTARTSYS;
	81	break;
	82	}
	83	schedule();
	84	} while (1);
	85	set_current_state(TASK_RUNNING);
	86	remove_wait_queue(&rtc->irq_queue, &wait);
	87
	88	if (ret == 0) {
	89	/* Check for any data updates */
	90	if (rtc->ops->read_callback)
cd966209	91	data = rtc->ops->read_callback(rtc->dev.parent,
3418ff76 AN	92	data);
	93
	94	if (sizeof(int) != sizeof(long) &&
	95	count == sizeof(unsigned int))
	96	ret = put_user(data, (unsigned int __user *)buf) ?:
	97	sizeof(unsigned int);
	98	else
	99	ret = put_user(data, (unsigned long __user *)buf) ?:
	100	sizeof(unsigned long);
e824290e AZ	101	}
	102	return ret;
	103	}
	104
	105	static unsigned int rtc_dev_poll(struct file file, poll_table wait)
	106	{
88efe137	107	struct rtc_device *rtc = file->private_data;
e824290e AZ	108	unsigned long data;
	109
	110	poll_wait(file, &rtc->irq_queue, wait);
	111
	112	data = rtc->irq_data;
	113
	114	return (data != 0) ? (POLLIN \| POLLRDNORM) : 0;
	115	}
	116
5ad31a57	117	static long rtc_dev_ioctl(struct file *file,
e824290e AZ	118	unsigned int cmd, unsigned long arg)
	119	{
	120	int err = 0;
ab6a2d70	121	struct rtc_device *rtc = file->private_data;
ff8371ac	122	const struct rtc_class_ops *ops = rtc->ops;
e824290e AZ	123	struct rtc_time tm;
	124	struct rtc_wkalrm alarm;
	125	void __user uarg = (void __user ) arg;
	126
5ad31a57 DB	127	err = mutex_lock_interruptible(&rtc->ops_lock);
5ad31a57 DB	128	if (err)
b68bb263	129	return err;
5ad31a57	130
2601a464	131	/* check that the calling task has appropriate permissions
110d693d AZ	132	* for certain ioctls. doing this check here is useful
	133	* to avoid duplicate code in each driver.
	134	*/
	135	switch (cmd) {
	136	case RTC_EPOCH_SET:
	137	case RTC_SET_TIME:
	138	if (!capable(CAP_SYS_TIME))
5ad31a57	139	err = -EACCES;
110d693d AZ	140	break;
	141
	142	case RTC_IRQP_SET:
	143	if (arg > rtc->max_user_freq && !capable(CAP_SYS_RESOURCE))
5ad31a57	144	err = -EACCES;
110d693d AZ	145	break;
	146
	147	case RTC_PIE_ON:
9d013d3b BK	148	if (rtc->irq_freq > rtc->max_user_freq &&
9d013d3b BK	149	!capable(CAP_SYS_RESOURCE))
5ad31a57	150	err = -EACCES;
110d693d AZ	151	break;
	152	}
	153
5ad31a57 DB	154	if (err)
	155	goto done;
	156
ac54cd2b	157	/*
8a0bdfd7 DB	158	* Drivers SHOULD NOT provide ioctl implementations
	159	* for these requests. Instead, provide methods to
	160	* support the following code, so that the RTC's main
	161	* features are accessible without using ioctls.
	162	*
	163	* RTC and alarm times will be in UTC, by preference,
	164	* but dual-booting with MS-Windows implies RTCs must
	165	* use the local wall clock time.
e824290e AZ	166	*/
	167
	168	switch (cmd) {
	169	case RTC_ALM_READ:
5ad31a57 DB	170	mutex_unlock(&rtc->ops_lock);
5ad31a57 DB	171
ab6a2d70	172	err = rtc_read_alarm(rtc, &alarm);
e824290e AZ	173	if (err < 0)
	174	return err;
	175
	176	if (copy_to_user(uarg, &alarm.time, sizeof(tm)))
5ad31a57 DB	177	err = -EFAULT;
5ad31a57 DB	178	return err;
e824290e AZ	179
e824290e AZ	180	case RTC_ALM_SET:
5ad31a57 DB	181	mutex_unlock(&rtc->ops_lock);
5ad31a57 DB	182
e824290e AZ	183	if (copy_from_user(&alarm.time, uarg, sizeof(tm)))
	184	return -EFAULT;
	185
	186	alarm.enabled = 0;
	187	alarm.pending = 0;
e824290e AZ	188	alarm.time.tm_wday = -1;
	189	alarm.time.tm_yday = -1;
	190	alarm.time.tm_isdst = -1;
f8245c26 DB	191
	192	/* RTC_ALM_SET alarms may be up to 24 hours in the future.
	193	* Rather than expecting every RTC to implement "don't care"
	194	* for day/month/year fields, just force the alarm to have
	195	* the right values for those fields.
	196	*
	197	* RTC_WKALM_SET should be used instead. Not only does it
	198	* eliminate the need for a separate RTC_AIE_ON call, it
	199	* doesn't have the "alarm 23:59:59 in the future" race.
	200	*
	201	* NOTE: some legacy code may have used invalid fields as
	202	* wildcards, exposing hardware "periodic alarm" capabilities.
	203	* Not supported here.
	204	*/
	205	{
	206	unsigned long now, then;
	207
	208	err = rtc_read_time(rtc, &tm);
	209	if (err < 0)
	210	return err;
	211	rtc_tm_to_time(&tm, &now);
	212
	213	alarm.time.tm_mday = tm.tm_mday;
	214	alarm.time.tm_mon = tm.tm_mon;
	215	alarm.time.tm_year = tm.tm_year;
	216	err = rtc_valid_tm(&alarm.time);
	217	if (err < 0)
	218	return err;
	219	rtc_tm_to_time(&alarm.time, &then);
	220
	221	/* alarm may need to wrap into tomorrow */
	222	if (then < now) {
	223	rtc_time_to_tm(now + 24 * 60 * 60, &tm);
	224	alarm.time.tm_mday = tm.tm_mday;
	225	alarm.time.tm_mon = tm.tm_mon;
	226	alarm.time.tm_year = tm.tm_year;
	227	}
	228	}
	229
5ad31a57	230	return rtc_set_alarm(rtc, &alarm);
e824290e AZ	231
e824290e AZ	232	case RTC_RD_TIME:
5ad31a57 DB	233	mutex_unlock(&rtc->ops_lock);
5ad31a57 DB	234
ab6a2d70	235	err = rtc_read_time(rtc, &tm);
e824290e AZ	236	if (err < 0)
	237	return err;
	238
	239	if (copy_to_user(uarg, &tm, sizeof(tm)))
5ad31a57 DB	240	err = -EFAULT;
5ad31a57 DB	241	return err;
e824290e AZ	242
e824290e AZ	243	case RTC_SET_TIME:
5ad31a57 DB	244	mutex_unlock(&rtc->ops_lock);
5ad31a57 DB	245
e824290e AZ	246	if (copy_from_user(&tm, uarg, sizeof(tm)))
	247	return -EFAULT;
	248
5ad31a57	249	return rtc_set_time(rtc, &tm);
2601a464	250
d691eb90 AZ	251	case RTC_PIE_ON:
	252	err = rtc_irq_set_state(rtc, NULL, 1);
	253	break;
	254
	255	case RTC_PIE_OFF:
	256	err = rtc_irq_set_state(rtc, NULL, 0);
2601a464 DB	257	break;
2601a464 DB	258
099e6576 AZ	259	case RTC_AIE_ON:
	260	mutex_unlock(&rtc->ops_lock);
	261	return rtc_alarm_irq_enable(rtc, 1);
	262
	263	case RTC_AIE_OFF:
	264	mutex_unlock(&rtc->ops_lock);
	265	return rtc_alarm_irq_enable(rtc, 0);
	266
	267	case RTC_UIE_ON:
	268	mutex_unlock(&rtc->ops_lock);
	269	return rtc_update_irq_enable(rtc, 1);
	270
	271	case RTC_UIE_OFF:
	272	mutex_unlock(&rtc->ops_lock);
	273	return rtc_update_irq_enable(rtc, 0);
	274
2601a464	275	case RTC_IRQP_SET:
d691eb90 AZ	276	err = rtc_irq_set_freq(rtc, NULL, arg);
	277	break;
	278
	279	case RTC_IRQP_READ:
	280	err = put_user(rtc->irq_freq, (unsigned long __user *)uarg);
2601a464 DB	281	break;
2601a464 DB	282
e824290e AZ	283	#if 0
	284	case RTC_EPOCH_SET:
	285	#ifndef rtc_epoch
	286	/*
	287	* There were no RTC clocks before 1900.
	288	*/
	289	if (arg < 1900) {
	290	err = -EINVAL;
	291	break;
	292	}
e824290e AZ	293	rtc_epoch = arg;
	294	err = 0;
	295	#endif
	296	break;
	297
	298	case RTC_EPOCH_READ:
	299	err = put_user(rtc_epoch, (unsigned long __user *)uarg);
	300	break;
	301	#endif
	302	case RTC_WKALM_SET:
5ad31a57	303	mutex_unlock(&rtc->ops_lock);
e824290e AZ	304	if (copy_from_user(&alarm, uarg, sizeof(alarm)))
	305	return -EFAULT;
	306
5ad31a57	307	return rtc_set_alarm(rtc, &alarm);
e824290e AZ	308
e824290e AZ	309	case RTC_WKALM_RD:
5ad31a57	310	mutex_unlock(&rtc->ops_lock);
ab6a2d70	311	err = rtc_read_alarm(rtc, &alarm);
e824290e AZ	312	if (err < 0)
	313	return err;
	314
	315	if (copy_to_user(uarg, &alarm, sizeof(alarm)))
5ad31a57 DB	316	err = -EFAULT;
5ad31a57 DB	317	return err;
e824290e AZ	318
e824290e AZ	319	default:
ac54cd2b JS	320	/* Finally try the driver's ioctl interface */
	321	if (ops->ioctl) {
	322	err = ops->ioctl(rtc->dev.parent, cmd, arg);
	323	if (err == -ENOIOCTLCMD)
	324	err = -ENOTTY;
	325	}
e824290e AZ	326	break;
	327	}
	328
5ad31a57 DB	329	done:
5ad31a57 DB	330	mutex_unlock(&rtc->ops_lock);
e824290e AZ	331	return err;
	332	}
	333
2e4a75cd MS	334	static int rtc_dev_fasync(int fd, struct file *file, int on)
	335	{
	336	struct rtc_device *rtc = file->private_data;
	337	return fasync_helper(fd, file, on, &rtc->async_queue);
	338	}
	339
e824290e AZ	340	static int rtc_dev_release(struct inode inode, struct file file)
e824290e AZ	341	{
88efe137	342	struct rtc_device *rtc = file->private_data;
e824290e	343
743e6a50 DB	344	/* We shut down the repeating IRQs that userspace enabled,
	345	* since nothing is listening to them.
	346	* - Update (UIE) ... currently only managed through ioctls
	347	* - Periodic (PIE) ... also used through rtc_*() interface calls
	348	*
	349	* Leave the alarm alone; it may be set to trigger a system wakeup
	350	* later, or be used by kernel code, and is a one-shot event anyway.
	351	*/
099e6576 AZ	352
099e6576 AZ	353	/* Keep ioctl until all drivers are converted */
743e6a50	354	rtc_dev_ioctl(file, RTC_UIE_OFF, 0);
099e6576	355	rtc_update_irq_enable(rtc, 0);
5cdc98b8 TJ	356	rtc_irq_set_state(rtc, NULL, 0);
5cdc98b8 TJ	357
e824290e	358	if (rtc->ops->release)
cd966209	359	rtc->ops->release(rtc->dev.parent);
e824290e	360
372a302e	361	clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
e824290e AZ	362	return 0;
	363	}
	364
d54b1fdb	365	static const struct file_operations rtc_dev_fops = {
e824290e AZ	366	.owner = THIS_MODULE,
	367	.llseek = no_llseek,
	368	.read = rtc_dev_read,
	369	.poll = rtc_dev_poll,
5ad31a57	370	.unlocked_ioctl = rtc_dev_ioctl,
e824290e AZ	371	.open = rtc_dev_open,
	372	.release = rtc_dev_release,
	373	.fasync = rtc_dev_fasync,
	374	};
	375
	376	/* insertion/removal hooks */
	377
cb3a58d2	378	void rtc_dev_prepare(struct rtc_device *rtc)
e824290e	379	{
5726fb20 DB	380	if (!rtc_devt)
5726fb20 DB	381	return;
e824290e AZ	382
e824290e AZ	383	if (rtc->id >= RTC_DEV_MAX) {
5726fb20 DB	384	pr_debug("%s: too many RTC devices\n", rtc->name);
5726fb20 DB	385	return;
e824290e AZ	386	}
e824290e AZ	387
cd966209	388	rtc->dev.devt = MKDEV(MAJOR(rtc_devt), rtc->id);
5726fb20	389
e824290e AZ	390	cdev_init(&rtc->char_dev, &rtc_dev_fops);
e824290e AZ	391	rtc->char_dev.owner = rtc->owner;
cb3a58d2	392	}
e824290e	393
cb3a58d2 DB	394	void rtc_dev_add_device(struct rtc_device *rtc)
cb3a58d2 DB	395	{
cd966209	396	if (cdev_add(&rtc->char_dev, rtc->dev.devt, 1))
5726fb20 DB	397	printk(KERN_WARNING "%s: failed to add char device %d:%d\n",
	398	rtc->name, MAJOR(rtc_devt), rtc->id);
	399	else
	400	pr_debug("%s: dev (%d:%d)\n", rtc->name,
e824290e	401	MAJOR(rtc_devt), rtc->id);
e824290e AZ	402	}
e824290e AZ	403
5726fb20	404	void rtc_dev_del_device(struct rtc_device *rtc)
e824290e	405	{
cd966209	406	if (rtc->dev.devt)
e824290e	407	cdev_del(&rtc->char_dev);
e824290e AZ	408	}
e824290e AZ	409
5726fb20	410	void __init rtc_dev_init(void)
e824290e AZ	411	{
	412	int err;
	413
e824290e	414	err = alloc_chrdev_region(&rtc_devt, 0, RTC_DEV_MAX, "rtc");
5726fb20	415	if (err < 0)
e824290e AZ	416	printk(KERN_ERR "%s: failed to allocate char dev region\n",
e824290e AZ	417	__FILE__);
e824290e AZ	418	}
e824290e AZ	419
5726fb20	420	void __exit rtc_dev_exit(void)
e824290e	421	{
5726fb20 DB	422	if (rtc_devt)
5726fb20 DB	423	unregister_chrdev_region(rtc_devt, RTC_DEV_MAX);
e824290e	424	}