[linux-2.6-block.git] / drivers / watchdog / ib700wdt.c

/*
 *	IB700 Single Board Computer WDT driver
 *
 *	(c) Copyright 2001 Charles Howes <chowes@vsol.net>
 *
 *	Based on advantechwdt.c which is based on acquirewdt.c which
 *	is based on wdt.c.
 *
 *	(c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
 *
 *	Based on acquirewdt.c which is 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
 *	     Added timeout module option to override default
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/ioport.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>

#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>

static struct platform_device *ibwdt_platform_device;
static unsigned long ibwdt_is_open;
static DEFINE_SPINLOCK(ibwdt_lock);
static char expect_close;

/* Module information */
#define DRV_NAME "ib700wdt"
#define PFX DRV_NAME ": "

/*
 *
 * Watchdog Timer Configuration
 *
 * The function of the watchdog timer is to reset the system
 * automatically and is defined at I/O port 0443H.  To enable the
 * watchdog timer and allow the system to reset, write I/O port 0443H.
 * To disable the timer, write I/O port 0441H for the system to stop the
 * watchdog function.  The timer has a tolerance of 20% for its
 * intervals.
 *
 * The following describes how the timer should be programmed.
 *
 * Enabling Watchdog:
 * MOV AX,000FH (Choose the values from 0 to F)
 * MOV DX,0443H
 * OUT DX,AX
 *
 * Disabling Watchdog:
 * MOV AX,000FH (Any value is fine.)
 * MOV DX,0441H
 * OUT DX,AX
 *
 * Watchdog timer control table:
 * Level   Value  Time/sec | Level Value Time/sec
 *   1       F       0     |   9     7      16
 *   2       E       2     |   10    6      18
 *   3       D       4     |   11    5      20
 *   4       C       6     |   12    4      22
 *   5       B       8     |   13    3      24
 *   6       A       10    |   14    2      26
 *   7       9       12    |   15    1      28
 *   8       8       14    |   16    0      30
 *
 */

static int wd_times[] = {
	30,	/* 0x0 */
	28,	/* 0x1 */
	26,	/* 0x2 */
	24,	/* 0x3 */
	22,	/* 0x4 */
	20,	/* 0x5 */
	18,	/* 0x6 */
	16,	/* 0x7 */
	14,	/* 0x8 */
	12,	/* 0x9 */
	10,	/* 0xA */
	8,	/* 0xB */
	6,	/* 0xC */
	4,	/* 0xD */
	2,	/* 0xE */
	0,	/* 0xF */
};

#define WDT_STOP 0x441
#define WDT_START 0x443

/* Default timeout */
#define WD_TIMO 0		/* 30 seconds +/- 20%, from table */

static int wd_margin = WD_TIMO;

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
ibwdt_ping(void)
{
	spin_lock(&ibwdt_lock);

	/* Write a watchdog value */
	outb_p(wd_margin, WDT_START);

	spin_unlock(&ibwdt_lock);
}

static void
ibwdt_disable(void)
{
	spin_lock(&ibwdt_lock);
	outb_p(0, WDT_STOP);
	spin_unlock(&ibwdt_lock);
}

static int
ibwdt_set_heartbeat(int t)
{
	int i;

	if ((t < 0) || (t > 30))
		return -EINVAL;

	for (i = 0x0F; i > -1; i--)
		if (wd_times[i] > t)
			break;
	wd_margin = i;
	return 0;
}

/*
 *	/dev/watchdog handling
 */

static ssize_t
ibwdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
	if (count) {
		if (!nowayout) {
			size_t i;

			/* In case it was set long ago */
			expect_close = 0;

			for (i = 0; i != count; i++) {
				char c;
				if (get_user(c, buf + i))
					return -EFAULT;
				if (c == 'V')
					expect_close = 42;
			}
		}
		ibwdt_ping();
	}
	return count;
}

static int
ibwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
	  unsigned long arg)
{
	int new_margin;
	void __user *argp = (void __user *)arg;
	int __user *p = argp;

	static struct watchdog_info ident = {
		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
		.firmware_version = 1,
		.identity = "IB700 WDT",
	};

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

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

	case WDIOC_KEEPALIVE:
	  ibwdt_ping();
	  break;

	case WDIOC_SETTIMEOUT:
	  if (get_user(new_margin, p))
		  return -EFAULT;
	  if (ibwdt_set_heartbeat(new_margin))
		  return -EINVAL;
	  ibwdt_ping();
	  /* Fall */

	case WDIOC_GETTIMEOUT:
	  return put_user(wd_times[wd_margin], p);

	case WDIOC_SETOPTIONS:
	{
	  int options, retval = -EINVAL;

	  if (get_user(options, p))
	    return -EFAULT;

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

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

	  return retval;
	}

	default:
	  return -ENOTTY;
	}
	return 0;
}

static int
ibwdt_open(struct inode *inode, struct file *file)
{
	if (test_and_set_bit(0, &ibwdt_is_open)) {
		return -EBUSY;
	}
	if (nowayout)
		__module_get(THIS_MODULE);

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

static int
ibwdt_close(struct inode *inode, struct file *file)
{
	if (expect_close == 42) {
		ibwdt_disable();
	} else {
		printk(KERN_CRIT PFX "WDT device closed unexpectedly.  WDT will not stop!\n");
		ibwdt_ping();
	}
	clear_bit(0, &ibwdt_is_open);
	expect_close = 0;
	return 0;
}

/*
 *	Kernel Interfaces
 */

static const struct file_operations ibwdt_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.write		= ibwdt_write,
	.ioctl		= ibwdt_ioctl,
	.open		= ibwdt_open,
	.release	= ibwdt_close,
};

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

/*
 *	Init & exit routines
 */

static int __devinit ibwdt_probe(struct platform_device *dev)
{
	int res;

#if WDT_START != WDT_STOP
	if (!request_region(WDT_STOP, 1, "IB700 WDT")) {
		printk (KERN_ERR PFX "STOP method I/O %X is not available.\n", WDT_STOP);
		res = -EIO;
		goto out_nostopreg;
	}
#endif

	if (!request_region(WDT_START, 1, "IB700 WDT")) {
		printk (KERN_ERR PFX "START method I/O %X is not available.\n", WDT_START);
		res = -EIO;
		goto out_nostartreg;
	}

	res = misc_register(&ibwdt_miscdev);
	if (res) {
		printk (KERN_ERR PFX "failed to register misc device\n");
		goto out_nomisc;
	}
	return 0;

out_nomisc:
	release_region(WDT_START, 1);
out_nostartreg:
#if WDT_START != WDT_STOP
	release_region(WDT_STOP, 1);
#endif
out_nostopreg:
	return res;
}

static int __devexit ibwdt_remove(struct platform_device *dev)
{
	misc_deregister(&ibwdt_miscdev);
	release_region(WDT_START,1);
#if WDT_START != WDT_STOP
	release_region(WDT_STOP,1);
#endif
	return 0;
}

static void ibwdt_shutdown(struct platform_device *dev)
{
	/* Turn the WDT off if we have a soft shutdown */
	ibwdt_disable();
}

static struct platform_driver ibwdt_driver = {
	.probe		= ibwdt_probe,
	.remove		= __devexit_p(ibwdt_remove),
	.shutdown	= ibwdt_shutdown,
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= DRV_NAME,
	},
};

static int __init ibwdt_init(void)
{
	int err;

	printk(KERN_INFO PFX "WDT driver for IB700 single board computer initialising.\n");

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

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

	return 0;

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

static void __exit ibwdt_exit(void)
{
	platform_device_unregister(ibwdt_platform_device);
	platform_driver_unregister(&ibwdt_driver);
	printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
}

module_init(ibwdt_init);
module_exit(ibwdt_exit);

MODULE_AUTHOR("Charles Howes <chowes@vsol.net>");
MODULE_DESCRIPTION("IB700 SBC watchdog driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

/* end of ib700wdt.c */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* IB700 Single Board Computer WDT driver
	3	*
	4	* (c) Copyright 2001 Charles Howes <chowes@vsol.net>
	5	*
c9d7710e WVS	6	* Based on advantechwdt.c which is based on acquirewdt.c which
c9d7710e WVS	7	* is based on wdt.c.
1da177e4 LT	8	*
	9	* (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
	10	*
	11	* Based on acquirewdt.c which is based on wdt.c.
	12	* Original copyright messages:
	13	*
	14	* (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
	15	* http://www.redhat.com
	16	*
	17	* This program is free software; you can redistribute it and/or
	18	* modify it under the terms of the GNU General Public License
	19	* as published by the Free Software Foundation; either version
	20	* 2 of the License, or (at your option) any later version.
	21	*
	22	* Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
	23	* warranty for any of this software. This material is provided
	24	* "AS-IS" and at no charge.
	25	*
	26	* (c) Copyright 1995 Alan Cox <alan@redhat.com>
	27	*
c9d7710e WVS	28	* 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
	29	* Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
	30	* Added timeout module option to override default
1da177e4 LT	31	*
	32	*/
	33
1da177e4 LT	34	#include <linux/module.h>
	35	#include <linux/types.h>
	36	#include <linux/miscdevice.h>
	37	#include <linux/watchdog.h>
	38	#include <linux/ioport.h>
1da177e4	39	#include <linux/fs.h>
1da177e4 LT	40	#include <linux/init.h>
	41	#include <linux/spinlock.h>
	42	#include <linux/moduleparam.h>
745ac1ea	43	#include <linux/platform_device.h>
1da177e4 LT	44
	45	#include <asm/io.h>
	46	#include <asm/uaccess.h>
	47	#include <asm/system.h>
	48
745ac1ea	49	static struct platform_device *ibwdt_platform_device;
1da177e4	50	static unsigned long ibwdt_is_open;
c7dfd0cc	51	static DEFINE_SPINLOCK(ibwdt_lock);
1da177e4 LT	52	static char expect_close;
1da177e4 LT	53
745ac1ea WVS	54	/* Module information */
	55	#define DRV_NAME "ib700wdt"
	56	#define PFX DRV_NAME ": "
1da177e4 LT	57
	58	/*
	59	*
	60	* Watchdog Timer Configuration
	61	*
	62	* The function of the watchdog timer is to reset the system
	63	* automatically and is defined at I/O port 0443H. To enable the
	64	* watchdog timer and allow the system to reset, write I/O port 0443H.
	65	* To disable the timer, write I/O port 0441H for the system to stop the
	66	* watchdog function. The timer has a tolerance of 20% for its
	67	* intervals.
	68	*
	69	* The following describes how the timer should be programmed.
	70	*
	71	* Enabling Watchdog:
	72	* MOV AX,000FH (Choose the values from 0 to F)
	73	* MOV DX,0443H
	74	* OUT DX,AX
	75	*
	76	* Disabling Watchdog:
	77	* MOV AX,000FH (Any value is fine.)
	78	* MOV DX,0441H
	79	* OUT DX,AX
	80	*
	81	* Watchdog timer control table:
	82	* Level Value Time/sec \| Level Value Time/sec
	83	* 1 F 0 \| 9 7 16
	84	* 2 E 2 \| 10 6 18
	85	* 3 D 4 \| 11 5 20
	86	* 4 C 6 \| 12 4 22
	87	* 5 B 8 \| 13 3 24
	88	* 6 A 10 \| 14 2 26
	89	* 7 9 12 \| 15 1 28
	90	* 8 8 14 \| 16 0 30
	91	*
	92	*/
	93
	94	static int wd_times[] = {
	95	30, /* 0x0 */
	96	28, /* 0x1 */
	97	26, /* 0x2 */
	98	24, /* 0x3 */
	99	22, /* 0x4 */
	100	20, /* 0x5 */
	101	18, /* 0x6 */
	102	16, /* 0x7 */
	103	14, /* 0x8 */
	104	12, /* 0x9 */
	105	10, /* 0xA */
	106	8, /* 0xB */
	107	6, /* 0xC */
	108	4, /* 0xD */
	109	2, /* 0xE */
	110	0, /* 0xF */
	111	};
	112
	113	#define WDT_STOP 0x441
	114	#define WDT_START 0x443
	115
	116	/* Default timeout */
	117	#define WD_TIMO 0 /* 30 seconds +/- 20%, from table */
	118
	119	static int wd_margin = WD_TIMO;
	120
4bfdf378	121	static int nowayout = WATCHDOG_NOWAYOUT;
1da177e4	122	module_param(nowayout, int, 0);
bffda5c8	123	MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
1da177e4 LT	124
	125
	126	/*
35d55c94	127	* Watchdog Operations
1da177e4 LT	128	*/
	129
	130	static void
	131	ibwdt_ping(void)
	132	{
e42162a4 WVS	133	spin_lock(&ibwdt_lock);
e42162a4 WVS	134
1da177e4 LT	135	/* Write a watchdog value */
1da177e4 LT	136	outb_p(wd_margin, WDT_START);
e42162a4 WVS	137
e42162a4 WVS	138	spin_unlock(&ibwdt_lock);
1da177e4 LT	139	}
1da177e4 LT	140
35d55c94 WVS	141	static void
	142	ibwdt_disable(void)
	143	{
e42162a4	144	spin_lock(&ibwdt_lock);
35d55c94	145	outb_p(0, WDT_STOP);
e42162a4	146	spin_unlock(&ibwdt_lock);
35d55c94 WVS	147	}
	148
	149	static int
	150	ibwdt_set_heartbeat(int t)
	151	{
	152	int i;
	153
	154	if ((t < 0) \|\| (t > 30))
	155	return -EINVAL;
	156
	157	for (i = 0x0F; i > -1; i--)
	158	if (wd_times[i] > t)
	159	break;
	160	wd_margin = i;
	161	return 0;
	162	}
	163
	164	/*
	165	* /dev/watchdog handling
	166	*/
	167
1da177e4 LT	168	static ssize_t
	169	ibwdt_write(struct file file, const char __user buf, size_t count, loff_t *ppos)
	170	{
	171	if (count) {
	172	if (!nowayout) {
	173	size_t i;
	174
	175	/* In case it was set long ago */
	176	expect_close = 0;
	177
	178	for (i = 0; i != count; i++) {
	179	char c;
	180	if (get_user(c, buf + i))
	181	return -EFAULT;
	182	if (c == 'V')
	183	expect_close = 42;
	184	}
	185	}
	186	ibwdt_ping();
	187	}
	188	return count;
	189	}
	190
	191	static int
	192	ibwdt_ioctl(struct inode inode, struct file file, unsigned int cmd,
	193	unsigned long arg)
	194	{
35d55c94	195	int new_margin;
1da177e4 LT	196	void __user argp = (void __user )arg;
	197	int __user *p = argp;
	198
	199	static struct watchdog_info ident = {
	200	.options = WDIOF_KEEPALIVEPING \| WDIOF_SETTIMEOUT \| WDIOF_MAGICCLOSE,
	201	.firmware_version = 1,
	202	.identity = "IB700 WDT",
	203	};
	204
	205	switch (cmd) {
	206	case WDIOC_GETSUPPORT:
	207	if (copy_to_user(argp, &ident, sizeof(ident)))
	208	return -EFAULT;
	209	break;
	210
	211	case WDIOC_GETSTATUS:
c9d7710e	212	case WDIOC_GETBOOTSTATUS:
1da177e4 LT	213	return put_user(0, p);
	214
	215	case WDIOC_KEEPALIVE:
	216	ibwdt_ping();
	217	break;
	218
	219	case WDIOC_SETTIMEOUT:
	220	if (get_user(new_margin, p))
	221	return -EFAULT;
35d55c94	222	if (ibwdt_set_heartbeat(new_margin))
1da177e4	223	return -EINVAL;
1da177e4 LT	224	ibwdt_ping();
	225	/* Fall */
	226
	227	case WDIOC_GETTIMEOUT:
	228	return put_user(wd_times[wd_margin], p);
e42162a4 WVS	229
	230	case WDIOC_SETOPTIONS:
	231	{
	232	int options, retval = -EINVAL;
	233
	234	if (get_user(options, p))
	235	return -EFAULT;
	236
	237	if (options & WDIOS_DISABLECARD) {
	238	ibwdt_disable();
	239	retval = 0;
	240	}
	241
	242	if (options & WDIOS_ENABLECARD) {
	243	ibwdt_ping();
	244	retval = 0;
	245	}
	246
	247	return retval;
	248	}
1da177e4 LT	249
1da177e4 LT	250	default:
795b89d2	251	return -ENOTTY;
1da177e4 LT	252	}
	253	return 0;
	254	}
	255
	256	static int
	257	ibwdt_open(struct inode inode, struct file file)
	258	{
1da177e4	259	if (test_and_set_bit(0, &ibwdt_is_open)) {
1da177e4 LT	260	return -EBUSY;
	261	}
	262	if (nowayout)
	263	__module_get(THIS_MODULE);
	264
	265	/* Activate */
	266	ibwdt_ping();
1da177e4 LT	267	return nonseekable_open(inode, file);
	268	}
	269
	270	static int
	271	ibwdt_close(struct inode inode, struct file file)
	272	{
c9d7710e	273	if (expect_close == 42) {
35d55c94	274	ibwdt_disable();
c9d7710e	275	} else {
1da177e4	276	printk(KERN_CRIT PFX "WDT device closed unexpectedly. WDT will not stop!\n");
c9d7710e WVS	277	ibwdt_ping();
c9d7710e WVS	278	}
1da177e4 LT	279	clear_bit(0, &ibwdt_is_open);
1da177e4 LT	280	expect_close = 0;
1da177e4 LT	281	return 0;
	282	}
	283
1da177e4 LT	284	/*
	285	* Kernel Interfaces
	286	*/
	287
62322d25	288	static const struct file_operations ibwdt_fops = {
1da177e4 LT	289	.owner = THIS_MODULE,
	290	.llseek = no_llseek,
	291	.write = ibwdt_write,
	292	.ioctl = ibwdt_ioctl,
	293	.open = ibwdt_open,
	294	.release = ibwdt_close,
	295	};
	296
	297	static struct miscdevice ibwdt_miscdev = {
	298	.minor = WATCHDOG_MINOR,
	299	.name = "watchdog",
	300	.fops = &ibwdt_fops,
	301	};
	302
f6e48039 WVS	303	/*
	304	* Init & exit routines
	305	*/
	306
745ac1ea	307	static int __devinit ibwdt_probe(struct platform_device *dev)
1da177e4 LT	308	{
	309	int res;
	310
1da177e4 LT	311	#if WDT_START != WDT_STOP
	312	if (!request_region(WDT_STOP, 1, "IB700 WDT")) {
	313	printk (KERN_ERR PFX "STOP method I/O %X is not available.\n", WDT_STOP);
	314	res = -EIO;
	315	goto out_nostopreg;
	316	}
	317	#endif
	318
	319	if (!request_region(WDT_START, 1, "IB700 WDT")) {
	320	printk (KERN_ERR PFX "START method I/O %X is not available.\n", WDT_START);
	321	res = -EIO;
	322	goto out_nostartreg;
	323	}
f6e48039	324
f6e48039 WVS	325	res = misc_register(&ibwdt_miscdev);
	326	if (res) {
	327	printk (KERN_ERR PFX "failed to register misc device\n");
	328	goto out_nomisc;
	329	}
1da177e4 LT	330	return 0;
1da177e4 LT	331
f6e48039	332	out_nomisc:
1da177e4 LT	333	release_region(WDT_START, 1);
	334	out_nostartreg:
	335	#if WDT_START != WDT_STOP
	336	release_region(WDT_STOP, 1);
	337	#endif
	338	out_nostopreg:
1da177e4 LT	339	return res;
	340	}
	341
745ac1ea	342	static int __devexit ibwdt_remove(struct platform_device *dev)
1da177e4 LT	343	{
1da177e4 LT	344	misc_deregister(&ibwdt_miscdev);
f6e48039	345	release_region(WDT_START,1);
1da177e4 LT	346	#if WDT_START != WDT_STOP
	347	release_region(WDT_STOP,1);
	348	#endif
745ac1ea WVS	349	return 0;
	350	}
	351
35fcf538 WVS	352	static void ibwdt_shutdown(struct platform_device *dev)
	353	{
	354	/* Turn the WDT off if we have a soft shutdown */
	355	ibwdt_disable();
	356	}
	357
745ac1ea WVS	358	static struct platform_driver ibwdt_driver = {
	359	.probe = ibwdt_probe,
	360	.remove = __devexit_p(ibwdt_remove),
35fcf538	361	.shutdown = ibwdt_shutdown,
745ac1ea WVS	362	.driver = {
	363	.owner = THIS_MODULE,
	364	.name = DRV_NAME,
	365	},
	366	};
	367
	368	static int __init ibwdt_init(void)
	369	{
	370	int err;
	371
	372	printk(KERN_INFO PFX "WDT driver for IB700 single board computer initialising.\n");
	373
	374	err = platform_driver_register(&ibwdt_driver);
	375	if (err)
	376	return err;
	377
	378	ibwdt_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
	379	if (IS_ERR(ibwdt_platform_device)) {
	380	err = PTR_ERR(ibwdt_platform_device);
	381	goto unreg_platform_driver;
	382	}
	383
	384	return 0;
	385
	386	unreg_platform_driver:
	387	platform_driver_unregister(&ibwdt_driver);
	388	return err;
	389	}
	390
	391	static void __exit ibwdt_exit(void)
	392	{
	393	platform_device_unregister(ibwdt_platform_device);
	394	platform_driver_unregister(&ibwdt_driver);
	395	printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
1da177e4 LT	396	}
	397
	398	module_init(ibwdt_init);
	399	module_exit(ibwdt_exit);
	400
	401	MODULE_AUTHOR("Charles Howes <chowes@vsol.net>");
	402	MODULE_DESCRIPTION("IB700 SBC watchdog driver");
	403	MODULE_LICENSE("GPL");
	404	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
	405
	406	/* end of ib700wdt.c */