[deliverable/linux.git] / drivers / char / watchdog / acquirewdt.c

/*
 *	Acquire Single Board Computer Watchdog Timer driver
 *
 *      Based on wdt.c. Original copyright messages:
 *
 *	(c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
 *				http://www.redhat.com
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 *
 *	Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
 *	warranty for any of this software. This material is provided
 *	"AS-IS" and at no charge.
 *
 *	(c) Copyright 1995    Alan Cox <alan@redhat.com>
 *
 *      14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
 *          Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
 *          Can't add timeout - driver doesn't allow changing value
 */

/*
 *	Theory of Operation:
 *		The Watch-Dog Timer is provided to ensure that standalone
 *		Systems can always recover from catastrophic conditions that
 *		caused the CPU to crash. This condition may have occured by
 *		external EMI or a software bug. When the CPU stops working
 *		correctly, hardware on the board will either perform a hardware
 *		reset (cold boot) or a non-maskable interrupt (NMI) to bring the
 *		system back to a known state.
 *
 *		The Watch-Dog Timer is controlled by two I/O Ports.
 *		  443 hex	- Read	- Enable or refresh the Watch-Dog Timer
 *		  043 hex	- Read	- Disable the Watch-Dog Timer
 *
 *		To enable the Watch-Dog Timer, a read from I/O port 443h must
 *		be performed. This will enable and activate the countdown timer
 *		which will eventually time out and either reset the CPU or cause
 *		an NMI depending on the setting of a jumper. To ensure that this
 *		reset condition does not occur, the Watch-Dog Timer must be
 *		periodically refreshed by reading the same I/O port 443h.
 *		The Watch-Dog Timer is disabled by reading I/O port 043h.
 *
 *		The Watch-Dog Timer Time-Out Period is set via jumpers.
 *		It can be 1, 2, 10, 20, 110 or 220 seconds.
 */

/*
 *	Includes, defines, variables, module parameters, ...
 */

/* Includes */
#include <linux/module.h>		/* For module specific items */
#include <linux/moduleparam.h>		/* For new moduleparam's */
#include <linux/types.h>		/* For standard types (like size_t) */
#include <linux/errno.h>		/* For the -ENODEV/... values */
#include <linux/kernel.h>		/* For printk/panic/... */
#include <linux/miscdevice.h>		/* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
#include <linux/watchdog.h>		/* For the watchdog specific items */
#include <linux/fs.h>			/* For file operations */
#include <linux/ioport.h>		/* For io-port access */
#include <linux/notifier.h>		/* For reboot notifier */
#include <linux/reboot.h>		/* For reboot notifier */
#include <linux/platform_device.h>	/* For platform_driver framework */
#include <linux/init.h>			/* For __init/__exit/... */

#include <asm/uaccess.h>		/* For copy_to_user/put_user/... */
#include <asm/io.h>			/* For inb/outb/... */

/* Module information */
#define DRV_NAME "acquirewdt"
#define PFX DRV_NAME ": "
#define WATCHDOG_NAME "Acquire WDT"
#define WATCHDOG_HEARTBEAT 0	/* There is no way to see what the correct time-out period is */

/* internal variables */
static struct platform_device *acq_platform_device;	/* the watchdog platform device */
static unsigned long acq_is_open;
static char expect_close;

/* module parameters */
static int wdt_stop = 0x43;	/* You must set this - there is no sane way to probe for this board. */
module_param(wdt_stop, int, 0);
MODULE_PARM_DESC(wdt_stop, "Acquire WDT 'stop' io port (default 0x43)");

static int wdt_start = 0x443;	/* You must set this - there is no sane way to probe for this board. */
module_param(wdt_start, int, 0);
MODULE_PARM_DESC(wdt_start, "Acquire WDT 'start' io port (default 0x443)");

static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

/*
 *	Watchdog Operations
 */

static void acq_keepalive(void)
{
	/* Write a watchdog value */
	inb_p(wdt_start);
}

static void acq_stop(void)
{
	/* Turn the card off */
	inb_p(wdt_stop);
}

/*
 *	/dev/watchdog handling
 */

static ssize_t acq_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
	/* See if we got the magic character 'V' and reload the timer */
	if(count) {
		if (!nowayout) {
			size_t i;

			/* note: just in case someone wrote the magic character
			 * five months ago... */
			expect_close = 0;

			/* scan to see whether or not we got the magic character */
			for (i = 0; i != count; i++) {
				char c;
				if (get_user(c, buf + i))
					return -EFAULT;
				if (c == 'V')
					expect_close = 42;
			}
		}

		/* Well, anyhow someone wrote to us, we should return that favour */
		acq_keepalive();
	}
	return count;
}

static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
	unsigned long arg)
{
	int options, retval = -EINVAL;
	void __user *argp = (void __user *)arg;
	int __user *p = argp;
	static struct watchdog_info ident =
	{
		.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
		.firmware_version = 1,
		.identity = WATCHDOG_NAME,
	};

	switch(cmd)
	{
	case WDIOC_GETSUPPORT:
	  return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;

	case WDIOC_GETSTATUS:
	case WDIOC_GETBOOTSTATUS:
	  return put_user(0, p);

	case WDIOC_KEEPALIVE:
	  acq_keepalive();
	  return 0;

	case WDIOC_GETTIMEOUT:
	  return put_user(WATCHDOG_HEARTBEAT, p);

	case WDIOC_SETOPTIONS:
	{
	    if (get_user(options, p))
	      return -EFAULT;

	    if (options & WDIOS_DISABLECARD)
	    {
	      acq_stop();
	      retval = 0;
	    }

	    if (options & WDIOS_ENABLECARD)
	    {
	      acq_keepalive();
	      retval = 0;
	    }

	    return retval;
	}

	default:
	  return -ENOTTY;
	}
}

static int acq_open(struct inode *inode, struct file *file)
{
	if (test_and_set_bit(0, &acq_is_open))
		return -EBUSY;

	if (nowayout)
		__module_get(THIS_MODULE);

	/* Activate */
	acq_keepalive();
	return nonseekable_open(inode, file);
}

static int acq_close(struct inode *inode, struct file *file)
{
	if (expect_close == 42) {
		acq_stop();
	} else {
		printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
		acq_keepalive();
	}
	clear_bit(0, &acq_is_open);
	expect_close = 0;
	return 0;
}

/*
 *	Notifier for system down
 */

static int acq_notify_sys(struct notifier_block *this, unsigned long code,
	void *unused)
{
	if(code==SYS_DOWN || code==SYS_HALT) {
		/* Turn the WDT off */
		acq_stop();
	}
	return NOTIFY_DONE;
}

/*
 *	Kernel Interfaces
 */

static const struct file_operations acq_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.write		= acq_write,
	.ioctl		= acq_ioctl,
	.open		= acq_open,
	.release	= acq_close,
};

static struct miscdevice acq_miscdev = {
	.minor	= WATCHDOG_MINOR,
	.name	= "watchdog",
	.fops	= &acq_fops,
};

/*
 *	The WDT card needs to learn about soft shutdowns in order to
 *	turn the timebomb registers off.
 */

static struct notifier_block acq_notifier = {
	.notifier_call = acq_notify_sys,
};

/*
 *	Init & exit routines
 */

static int __devinit acq_probe(struct platform_device *dev)
{
	int ret;

	if (wdt_stop != wdt_start) {
		if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) {
			printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
				wdt_stop);
			ret = -EIO;
			goto out;
		}
	}

	if (!request_region(wdt_start, 1, WATCHDOG_NAME)) {
		printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
			wdt_start);
		ret = -EIO;
		goto unreg_stop;
	}

	ret = register_reboot_notifier(&acq_notifier);
	if (ret != 0) {
		printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
			ret);
		goto unreg_regions;
	}

	ret = misc_register(&acq_miscdev);
	if (ret != 0) {
		printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
			WATCHDOG_MINOR, ret);
		goto unreg_reboot;
	}

	printk (KERN_INFO PFX "initialized. (nowayout=%d)\n",
		nowayout);

	return 0;

unreg_reboot:
	unregister_reboot_notifier(&acq_notifier);
unreg_regions:
	release_region(wdt_start, 1);
unreg_stop:
	if (wdt_stop != wdt_start)
		release_region(wdt_stop, 1);
out:
	return ret;
}

static int __devexit acq_remove(struct platform_device *dev)
{
	misc_deregister(&acq_miscdev);
	unregister_reboot_notifier(&acq_notifier);
	release_region(wdt_start,1);
	if(wdt_stop != wdt_start)
		release_region(wdt_stop,1);

	return 0;
}

static struct platform_driver acquirewdt_driver = {
	.probe		= acq_probe,
	.remove		= __devexit_p(acq_remove),
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= DRV_NAME,
	},
};

static int __init acq_init(void)
{
	int err;

	printk(KERN_INFO "WDT driver for Acquire single board computer initialising.\n");

	err = platform_driver_register(&acquirewdt_driver);
	if (err)
		return err;

	acq_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
	if (IS_ERR(acq_platform_device)) {
		err = PTR_ERR(acq_platform_device);
		goto unreg_platform_driver;
	}

	return 0;

unreg_platform_driver:
	platform_driver_unregister(&acquirewdt_driver);
	return err;
}

static void __exit acq_exit(void)
{
	platform_device_unregister(acq_platform_device);
	platform_driver_unregister(&acquirewdt_driver);
	printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
}

module_init(acq_init);
module_exit(acq_exit);

MODULE_AUTHOR("David Woodhouse");
MODULE_DESCRIPTION("Acquire Inc. Single Board Computer Watchdog Timer driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Acquire Single Board Computer Watchdog Timer driver
	3	*
	4	* Based on wdt.c. Original copyright messages:
	5	*
	6	* (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
	7	* http://www.redhat.com
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License
	11	* as published by the Free Software Foundation; either version
	12	* 2 of the License, or (at your option) any later version.
	13	*
	14	* Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
	15	* warranty for any of this software. This material is provided
	16	* "AS-IS" and at no charge.
	17	*
	18	* (c) Copyright 1995 Alan Cox <alan@redhat.com>
	19	*
	20	* 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
	21	* Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
	22	* Can't add timeout - driver doesn't allow changing value
	23	*/
	24
	25	/*
	26	* Theory of Operation:
	27	* The Watch-Dog Timer is provided to ensure that standalone
	28	* Systems can always recover from catastrophic conditions that
	29	* caused the CPU to crash. This condition may have occured by
	30	* external EMI or a software bug. When the CPU stops working
	31	* correctly, hardware on the board will either perform a hardware
	32	* reset (cold boot) or a non-maskable interrupt (NMI) to bring the
	33	* system back to a known state.
	34	*
	35	* The Watch-Dog Timer is controlled by two I/O Ports.
	36	* 443 hex - Read - Enable or refresh the Watch-Dog Timer
	37	* 043 hex - Read - Disable the Watch-Dog Timer
	38	*
	39	* To enable the Watch-Dog Timer, a read from I/O port 443h must
	40	* be performed. This will enable and activate the countdown timer
	41	* which will eventually time out and either reset the CPU or cause
	42	* an NMI depending on the setting of a jumper. To ensure that this
	43	* reset condition does not occur, the Watch-Dog Timer must be
	44	* periodically refreshed by reading the same I/O port 443h.
	45	* The Watch-Dog Timer is disabled by reading I/O port 043h.
	46	*
	47	* The Watch-Dog Timer Time-Out Period is set via jumpers.
	48	* It can be 1, 2, 10, 20, 110 or 220 seconds.
	49	*/
	50
76c11f04 WVS	51	/*
	52	* Includes, defines, variables, module parameters, ...
	53	*/
1da177e4	54
76c11f04 WVS	55	/* Includes */
	56	#include <linux/module.h> /* For module specific items */
	57	#include <linux/moduleparam.h> /* For new moduleparam's */
	58	#include <linux/types.h> /* For standard types (like size_t) */
	59	#include <linux/errno.h> /* For the -ENODEV/... values */
	60	#include <linux/kernel.h> /* For printk/panic/... */
	61	#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
	62	#include <linux/watchdog.h> /* For the watchdog specific items */
	63	#include <linux/fs.h> /* For file operations */
	64	#include <linux/ioport.h> /* For io-port access */
	65	#include <linux/notifier.h> /* For reboot notifier */
	66	#include <linux/reboot.h> /* For reboot notifier */
ad5fe323	67	#include <linux/platform_device.h> /* For platform_driver framework */
76c11f04 WVS	68	#include <linux/init.h> /* For __init/__exit/... */
	69
	70	#include <asm/uaccess.h> /* For copy_to_user/put_user/... */
	71	#include <asm/io.h> /* For inb/outb/... */
	72
	73	/* Module information */
	74	#define DRV_NAME "acquirewdt"
	75	#define PFX DRV_NAME ": "
1da177e4	76	#define WATCHDOG_NAME "Acquire WDT"
1da177e4 LT	77	#define WATCHDOG_HEARTBEAT 0 /* There is no way to see what the correct time-out period is */
1da177e4 LT	78
76c11f04	79	/* internal variables */
ad5fe323	80	static struct platform_device acq_platform_device; / the watchdog platform device */
1da177e4 LT	81	static unsigned long acq_is_open;
	82	static char expect_close;
	83
76c11f04 WVS	84	/* module parameters */
76c11f04 WVS	85	static int wdt_stop = 0x43; /* You must set this - there is no sane way to probe for this board. */
1da177e4 LT	86	module_param(wdt_stop, int, 0);
	87	MODULE_PARM_DESC(wdt_stop, "Acquire WDT 'stop' io port (default 0x43)");
	88
76c11f04	89	static int wdt_start = 0x443; /* You must set this - there is no sane way to probe for this board. */
1da177e4 LT	90	module_param(wdt_start, int, 0);
	91	MODULE_PARM_DESC(wdt_start, "Acquire WDT 'start' io port (default 0x443)");
	92
4bfdf378	93	static int nowayout = WATCHDOG_NOWAYOUT;
1da177e4	94	module_param(nowayout, int, 0);
76c11f04	95	MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
1da177e4 LT	96
1da177e4 LT	97	/*
76c11f04	98	* Watchdog Operations
1da177e4 LT	99	*/
	100
	101	static void acq_keepalive(void)
	102	{
	103	/* Write a watchdog value */
	104	inb_p(wdt_start);
	105	}
	106
	107	static void acq_stop(void)
	108	{
	109	/* Turn the card off */
	110	inb_p(wdt_stop);
	111	}
	112
	113	/*
76c11f04	114	* /dev/watchdog handling
1da177e4 LT	115	*/
	116
	117	static ssize_t acq_write(struct file file, const char __user buf, size_t count, loff_t *ppos)
	118	{
	119	/* See if we got the magic character 'V' and reload the timer */
	120	if(count) {
	121	if (!nowayout) {
	122	size_t i;
	123
	124	/* note: just in case someone wrote the magic character
	125	* five months ago... */
	126	expect_close = 0;
	127
	128	/* scan to see whether or not we got the magic character */
	129	for (i = 0; i != count; i++) {
	130	char c;
	131	if (get_user(c, buf + i))
	132	return -EFAULT;
	133	if (c == 'V')
	134	expect_close = 42;
	135	}
	136	}
	137
	138	/* Well, anyhow someone wrote to us, we should return that favour */
	139	acq_keepalive();
	140	}
	141	return count;
	142	}
	143
	144	static int acq_ioctl(struct inode inode, struct file file, unsigned int cmd,
	145	unsigned long arg)
	146	{
	147	int options, retval = -EINVAL;
	148	void __user argp = (void __user )arg;
	149	int __user *p = argp;
	150	static struct watchdog_info ident =
	151	{
	152	.options = WDIOF_KEEPALIVEPING \| WDIOF_MAGICCLOSE,
	153	.firmware_version = 1,
76c11f04	154	.identity = WATCHDOG_NAME,
1da177e4 LT	155	};
	156
	157	switch(cmd)
	158	{
	159	case WDIOC_GETSUPPORT:
	160	return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
	161
	162	case WDIOC_GETSTATUS:
	163	case WDIOC_GETBOOTSTATUS:
	164	return put_user(0, p);
	165
	166	case WDIOC_KEEPALIVE:
	167	acq_keepalive();
	168	return 0;
	169
	170	case WDIOC_GETTIMEOUT:
	171	return put_user(WATCHDOG_HEARTBEAT, p);
	172
	173	case WDIOC_SETOPTIONS:
	174	{
	175	if (get_user(options, p))
	176	return -EFAULT;
	177
	178	if (options & WDIOS_DISABLECARD)
	179	{
	180	acq_stop();
	181	retval = 0;
	182	}
	183
	184	if (options & WDIOS_ENABLECARD)
	185	{
	186	acq_keepalive();
	187	retval = 0;
	188	}
	189
	190	return retval;
	191	}
	192
	193	default:
795b89d2	194	return -ENOTTY;
1da177e4 LT	195	}
	196	}
	197
	198	static int acq_open(struct inode inode, struct file file)
	199	{
	200	if (test_and_set_bit(0, &acq_is_open))
	201	return -EBUSY;
	202
	203	if (nowayout)
	204	__module_get(THIS_MODULE);
	205
	206	/* Activate */
	207	acq_keepalive();
	208	return nonseekable_open(inode, file);
	209	}
	210
	211	static int acq_close(struct inode inode, struct file file)
	212	{
	213	if (expect_close == 42) {
	214	acq_stop();
	215	} else {
	216	printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
	217	acq_keepalive();
	218	}
	219	clear_bit(0, &acq_is_open);
	220	expect_close = 0;
	221	return 0;
	222	}
	223
	224	/*
	225	* Notifier for system down
	226	*/
	227
	228	static int acq_notify_sys(struct notifier_block *this, unsigned long code,
	229	void *unused)
	230	{
	231	if(code==SYS_DOWN \|\| code==SYS_HALT) {
	232	/* Turn the WDT off */
	233	acq_stop();
	234	}
	235	return NOTIFY_DONE;
	236	}
	237
	238	/*
	239	* Kernel Interfaces
	240	*/
	241
62322d25	242	static const struct file_operations acq_fops = {
1da177e4 LT	243	.owner = THIS_MODULE,
	244	.llseek = no_llseek,
	245	.write = acq_write,
	246	.ioctl = acq_ioctl,
	247	.open = acq_open,
	248	.release = acq_close,
	249	};
	250
76c11f04 WVS	251	static struct miscdevice acq_miscdev = {
	252	.minor = WATCHDOG_MINOR,
	253	.name = "watchdog",
	254	.fops = &acq_fops,
1da177e4 LT	255	};
	256
	257	/*
	258	* The WDT card needs to learn about soft shutdowns in order to
	259	* turn the timebomb registers off.
	260	*/
	261
76c11f04	262	static struct notifier_block acq_notifier = {
1da177e4 LT	263	.notifier_call = acq_notify_sys,
	264	};
	265
76c11f04 WVS	266	/*
	267	* Init & exit routines
	268	*/
	269
ad5fe323	270	static int __devinit acq_probe(struct platform_device *dev)
1da177e4 LT	271	{
	272	int ret;
	273
1da177e4 LT	274	if (wdt_stop != wdt_start) {
	275	if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) {
	276	printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
	277	wdt_stop);
	278	ret = -EIO;
	279	goto out;
	280	}
	281	}
	282
	283	if (!request_region(wdt_start, 1, WATCHDOG_NAME)) {
	284	printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
	285	wdt_start);
	286	ret = -EIO;
	287	goto unreg_stop;
	288	}
	289
	290	ret = register_reboot_notifier(&acq_notifier);
	291	if (ret != 0) {
	292	printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
	293	ret);
	294	goto unreg_regions;
	295	}
	296
	297	ret = misc_register(&acq_miscdev);
	298	if (ret != 0) {
	299	printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
	300	WATCHDOG_MINOR, ret);
	301	goto unreg_reboot;
	302	}
	303
	304	printk (KERN_INFO PFX "initialized. (nowayout=%d)\n",
	305	nowayout);
	306
	307	return 0;
	308
	309	unreg_reboot:
	310	unregister_reboot_notifier(&acq_notifier);
	311	unreg_regions:
	312	release_region(wdt_start, 1);
	313	unreg_stop:
	314	if (wdt_stop != wdt_start)
	315	release_region(wdt_stop, 1);
	316	out:
	317	return ret;
	318	}
	319
ad5fe323	320	static int __devexit acq_remove(struct platform_device *dev)
1da177e4 LT	321	{
	322	misc_deregister(&acq_miscdev);
	323	unregister_reboot_notifier(&acq_notifier);
76c11f04	324	release_region(wdt_start,1);
1da177e4 LT	325	if(wdt_stop != wdt_start)
1da177e4 LT	326	release_region(wdt_stop,1);
ad5fe323 WVS	327
	328	return 0;
	329	}
	330
	331	static struct platform_driver acquirewdt_driver = {
	332	.probe = acq_probe,
	333	.remove = __devexit_p(acq_remove),
	334	.driver = {
	335	.owner = THIS_MODULE,
	336	.name = DRV_NAME,
	337	},
	338	};
	339
	340	static int __init acq_init(void)
	341	{
	342	int err;
	343
	344	printk(KERN_INFO "WDT driver for Acquire single board computer initialising.\n");
	345
	346	err = platform_driver_register(&acquirewdt_driver);
	347	if (err)
	348	return err;
	349
	350	acq_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
	351	if (IS_ERR(acq_platform_device)) {
	352	err = PTR_ERR(acq_platform_device);
	353	goto unreg_platform_driver;
	354	}
	355
	356	return 0;
	357
	358	unreg_platform_driver:
	359	platform_driver_unregister(&acquirewdt_driver);
	360	return err;
	361	}
	362
	363	static void __exit acq_exit(void)
	364	{
	365	platform_device_unregister(acq_platform_device);
	366	platform_driver_unregister(&acquirewdt_driver);
	367	printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
1da177e4 LT	368	}
	369
	370	module_init(acq_init);
	371	module_exit(acq_exit);
	372
	373	MODULE_AUTHOR("David Woodhouse");
	374	MODULE_DESCRIPTION("Acquire Inc. Single Board Computer Watchdog Timer driver");
	375	MODULE_LICENSE("GPL");
	376	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);