[net-next-2.6.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@lxorguk.ukuu.org.uk>,
 *						All Rights Reserved.
 *
 *	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@lxorguk.ukuu.org.uk>
 *
 *	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 <linux/io.h>
#include <linux/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
 *
 */

#define WDT_STOP 0x441
#define WDT_START 0x443

/* Default timeout */
#define WATCHDOG_TIMEOUT 30		/* 30 seconds +/- 20% */
static int timeout = WATCHDOG_TIMEOUT;	/* in seconds */
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout,
	"Watchdog timeout in seconds. 0<= timeout <=30, default="
		__MODULE_STRING(WATCHDOG_TIMEOUT) ".");

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)
{
	int wd_margin = 15 - ((timeout + 1) / 2);

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

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

	static const 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_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;
	}
	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(timeout, p);

	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,
	.unlocked_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;
	}

	/* Check that the heartbeat value is within it's range ;
	 * if not reset to the default */
	if (ibwdt_set_heartbeat(timeout)) {
		ibwdt_set_heartbeat(WATCHDOG_TIMEOUT);
		printk(KERN_INFO PFX
			"timeout value must be 0<=x<=30, using %d\n", timeout);
	}

	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	*
29fa0586 AC	14	* (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
29fa0586 AC	15	* All Rights Reserved.
1da177e4 LT	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	*
29fa0586	26	* (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
1da177e4	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>
2e43ba73 AC	44	#include <linux/io.h>
2e43ba73 AC	45	#include <linux/uaccess.h>
089ab079	46
1da177e4 LT	47	#include <asm/system.h>
1da177e4 LT	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
1da177e4 LT	94	#define WDT_STOP 0x441
	95	#define WDT_START 0x443
	96
	97	/* Default timeout */
794db26f WVS	98	#define WATCHDOG_TIMEOUT 30 /* 30 seconds +/- 20% */
	99	static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
	100	module_param(timeout, int, 0);
	101	MODULE_PARM_DESC(timeout,
	102	"Watchdog timeout in seconds. 0<= timeout <=30, default="
	103	__MODULE_STRING(WATCHDOG_TIMEOUT) ".");
1da177e4	104
4bfdf378	105	static int nowayout = WATCHDOG_NOWAYOUT;
1da177e4	106	module_param(nowayout, int, 0);
2e43ba73 AC	107	MODULE_PARM_DESC(nowayout,
	108	"Watchdog cannot be stopped once started (default="
	109	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
1da177e4 LT	110
	111
	112	/*
35d55c94	113	* Watchdog Operations
1da177e4 LT	114	*/
1da177e4 LT	115
7944d3a5	116	static void ibwdt_ping(void)
1da177e4	117	{
794db26f WVS	118	int wd_margin = 15 - ((timeout + 1) / 2);
794db26f WVS	119
e42162a4 WVS	120	spin_lock(&ibwdt_lock);
e42162a4 WVS	121
1da177e4 LT	122	/* Write a watchdog value */
1da177e4 LT	123	outb_p(wd_margin, WDT_START);
e42162a4 WVS	124
e42162a4 WVS	125	spin_unlock(&ibwdt_lock);
1da177e4 LT	126	}
1da177e4 LT	127
7944d3a5	128	static void ibwdt_disable(void)
35d55c94	129	{
e42162a4	130	spin_lock(&ibwdt_lock);
35d55c94	131	outb_p(0, WDT_STOP);
e42162a4	132	spin_unlock(&ibwdt_lock);
35d55c94 WVS	133	}
35d55c94 WVS	134
7944d3a5	135	static int ibwdt_set_heartbeat(int t)
35d55c94	136	{
794db26f	137	if (t < 0 \|\| t > 30)
35d55c94 WVS	138	return -EINVAL;
35d55c94 WVS	139
794db26f	140	timeout = t;
35d55c94 WVS	141	return 0;
	142	}
	143
	144	/*
	145	* /dev/watchdog handling
	146	*/
	147
2e43ba73 AC	148	static ssize_t ibwdt_write(struct file file, const char __user buf,
2e43ba73 AC	149	size_t count, loff_t *ppos)
1da177e4 LT	150	{
	151	if (count) {
	152	if (!nowayout) {
	153	size_t i;
	154
	155	/* In case it was set long ago */
	156	expect_close = 0;
	157
	158	for (i = 0; i != count; i++) {
	159	char c;
	160	if (get_user(c, buf + i))
	161	return -EFAULT;
	162	if (c == 'V')
	163	expect_close = 42;
	164	}
	165	}
	166	ibwdt_ping();
	167	}
	168	return count;
	169	}
	170
2e43ba73	171	static long ibwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1da177e4	172	{
35d55c94	173	int new_margin;
1da177e4 LT	174	void __user argp = (void __user )arg;
	175	int __user *p = argp;
	176
42747d71	177	static const struct watchdog_info ident = {
2e43ba73 AC	178	.options = WDIOF_KEEPALIVEPING \| WDIOF_SETTIMEOUT
2e43ba73 AC	179	\| WDIOF_MAGICCLOSE,
1da177e4 LT	180	.firmware_version = 1,
	181	.identity = "IB700 WDT",
	182	};
	183
	184	switch (cmd) {
	185	case WDIOC_GETSUPPORT:
2e43ba73 AC	186	if (copy_to_user(argp, &ident, sizeof(ident)))
	187	return -EFAULT;
	188	break;
1da177e4 LT	189
1da177e4 LT	190	case WDIOC_GETSTATUS:
c9d7710e	191	case WDIOC_GETBOOTSTATUS:
2e43ba73	192	return put_user(0, p);
1da177e4	193
e42162a4 WVS	194	case WDIOC_SETOPTIONS:
e42162a4 WVS	195	{
2e43ba73	196	int options, retval = -EINVAL;
e42162a4	197
2e43ba73 AC	198	if (get_user(options, p))
2e43ba73 AC	199	return -EFAULT;
e42162a4	200
2e43ba73 AC	201	if (options & WDIOS_DISABLECARD) {
	202	ibwdt_disable();
	203	retval = 0;
	204	}
	205	if (options & WDIOS_ENABLECARD) {
	206	ibwdt_ping();
	207	retval = 0;
	208	}
	209	return retval;
e42162a4	210	}
0c06090c WVS	211	case WDIOC_KEEPALIVE:
	212	ibwdt_ping();
	213	break;
	214
	215	case WDIOC_SETTIMEOUT:
	216	if (get_user(new_margin, p))
	217	return -EFAULT;
	218	if (ibwdt_set_heartbeat(new_margin))
	219	return -EINVAL;
	220	ibwdt_ping();
	221	/* Fall */
	222
	223	case WDIOC_GETTIMEOUT:
794db26f	224	return put_user(timeout, p);
0c06090c	225
1da177e4	226	default:
2e43ba73	227	return -ENOTTY;
1da177e4 LT	228	}
	229	return 0;
	230	}
	231
2e43ba73	232	static int ibwdt_open(struct inode inode, struct file file)
1da177e4	233	{
2e43ba73	234	if (test_and_set_bit(0, &ibwdt_is_open))
1da177e4	235	return -EBUSY;
1da177e4 LT	236	if (nowayout)
	237	__module_get(THIS_MODULE);
	238
	239	/* Activate */
	240	ibwdt_ping();
1da177e4 LT	241	return nonseekable_open(inode, file);
	242	}
	243
7944d3a5	244	static int ibwdt_close(struct inode inode, struct file file)
1da177e4	245	{
c9d7710e	246	if (expect_close == 42) {
35d55c94	247	ibwdt_disable();
c9d7710e	248	} else {
2e43ba73 AC	249	printk(KERN_CRIT PFX
2e43ba73 AC	250	"WDT device closed unexpectedly. WDT will not stop!\n");
c9d7710e WVS	251	ibwdt_ping();
c9d7710e WVS	252	}
1da177e4 LT	253	clear_bit(0, &ibwdt_is_open);
1da177e4 LT	254	expect_close = 0;
1da177e4 LT	255	return 0;
	256	}
	257
1da177e4 LT	258	/*
	259	* Kernel Interfaces
	260	*/
	261
62322d25	262	static const struct file_operations ibwdt_fops = {
1da177e4 LT	263	.owner = THIS_MODULE,
	264	.llseek = no_llseek,
	265	.write = ibwdt_write,
2e43ba73	266	.unlocked_ioctl = ibwdt_ioctl,
1da177e4 LT	267	.open = ibwdt_open,
	268	.release = ibwdt_close,
	269	};
	270
	271	static struct miscdevice ibwdt_miscdev = {
	272	.minor = WATCHDOG_MINOR,
	273	.name = "watchdog",
	274	.fops = &ibwdt_fops,
	275	};
	276
f6e48039 WVS	277	/*
	278	* Init & exit routines
	279	*/
	280
745ac1ea	281	static int __devinit ibwdt_probe(struct platform_device *dev)
1da177e4 LT	282	{
	283	int res;
	284
1da177e4 LT	285	#if WDT_START != WDT_STOP
1da177e4 LT	286	if (!request_region(WDT_STOP, 1, "IB700 WDT")) {
2e43ba73 AC	287	printk(KERN_ERR PFX "STOP method I/O %X is not available.\n",
2e43ba73 AC	288	WDT_STOP);
1da177e4 LT	289	res = -EIO;
	290	goto out_nostopreg;
	291	}
	292	#endif
	293
	294	if (!request_region(WDT_START, 1, "IB700 WDT")) {
2e43ba73 AC	295	printk(KERN_ERR PFX "START method I/O %X is not available.\n",
2e43ba73 AC	296	WDT_START);
1da177e4 LT	297	res = -EIO;
	298	goto out_nostartreg;
	299	}
f6e48039	300
794db26f WVS	301	/* Check that the heartbeat value is within it's range ;
	302	* if not reset to the default */
	303	if (ibwdt_set_heartbeat(timeout)) {
	304	ibwdt_set_heartbeat(WATCHDOG_TIMEOUT);
	305	printk(KERN_INFO PFX
	306	"timeout value must be 0<=x<=30, using %d\n", timeout);
	307	}
	308
f6e48039 WVS	309	res = misc_register(&ibwdt_miscdev);
f6e48039 WVS	310	if (res) {
2e43ba73	311	printk(KERN_ERR PFX "failed to register misc device\n");
f6e48039 WVS	312	goto out_nomisc;
f6e48039 WVS	313	}
1da177e4 LT	314	return 0;
1da177e4 LT	315
f6e48039	316	out_nomisc:
1da177e4 LT	317	release_region(WDT_START, 1);
	318	out_nostartreg:
	319	#if WDT_START != WDT_STOP
	320	release_region(WDT_STOP, 1);
	321	#endif
	322	out_nostopreg:
1da177e4 LT	323	return res;
	324	}
	325
745ac1ea	326	static int __devexit ibwdt_remove(struct platform_device *dev)
1da177e4 LT	327	{
1da177e4 LT	328	misc_deregister(&ibwdt_miscdev);
2e43ba73	329	release_region(WDT_START, 1);
1da177e4	330	#if WDT_START != WDT_STOP
2e43ba73	331	release_region(WDT_STOP, 1);
1da177e4	332	#endif
745ac1ea WVS	333	return 0;
	334	}
	335
35fcf538 WVS	336	static void ibwdt_shutdown(struct platform_device *dev)
	337	{
	338	/* Turn the WDT off if we have a soft shutdown */
	339	ibwdt_disable();
	340	}
	341
745ac1ea WVS	342	static struct platform_driver ibwdt_driver = {
	343	.probe = ibwdt_probe,
	344	.remove = __devexit_p(ibwdt_remove),
35fcf538	345	.shutdown = ibwdt_shutdown,
745ac1ea WVS	346	.driver = {
	347	.owner = THIS_MODULE,
	348	.name = DRV_NAME,
	349	},
	350	};
	351
	352	static int __init ibwdt_init(void)
	353	{
	354	int err;
	355
2e43ba73 AC	356	printk(KERN_INFO PFX
2e43ba73 AC	357	"WDT driver for IB700 single board computer initialising.\n");
745ac1ea WVS	358
	359	err = platform_driver_register(&ibwdt_driver);
	360	if (err)
	361	return err;
	362
2e43ba73 AC	363	ibwdt_platform_device = platform_device_register_simple(DRV_NAME,
2e43ba73 AC	364	-1, NULL, 0);
745ac1ea WVS	365	if (IS_ERR(ibwdt_platform_device)) {
	366	err = PTR_ERR(ibwdt_platform_device);
	367	goto unreg_platform_driver;
	368	}
	369
	370	return 0;
	371
	372	unreg_platform_driver:
	373	platform_driver_unregister(&ibwdt_driver);
	374	return err;
	375	}
	376
	377	static void __exit ibwdt_exit(void)
	378	{
	379	platform_device_unregister(ibwdt_platform_device);
	380	platform_driver_unregister(&ibwdt_driver);
	381	printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
1da177e4 LT	382	}
	383
	384	module_init(ibwdt_init);
	385	module_exit(ibwdt_exit);
	386
	387	MODULE_AUTHOR("Charles Howes <chowes@vsol.net>");
	388	MODULE_DESCRIPTION("IB700 SBC watchdog driver");
	389	MODULE_LICENSE("GPL");
	390	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
	391
	392	/* end of ib700wdt.c */