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

// SPDX-License-Identifier: GPL-2.0+
/*
 *	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.
 *
 *	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
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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>


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"

/*
 *
 * 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 bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 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();
		fallthrough;

	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 stream_open(inode, file);
}

static int ibwdt_close(struct inode *inode, struct file *file)
{
	if (expect_close == 42) {
		ibwdt_disable();
	} else {
		pr_crit("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,
	.compat_ioctl	= compat_ptr_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 __init ibwdt_probe(struct platform_device *dev)
{
	int res;

#if WDT_START != WDT_STOP
	if (!request_region(WDT_STOP, 1, "IB700 WDT")) {
		pr_err("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")) {
		pr_err("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);
		pr_info("timeout value must be 0<=x<=30, using %d\n", timeout);
	}

	res = misc_register(&ibwdt_miscdev);
	if (res) {
		pr_err("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 void 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
}

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 = {
	.remove_new	= ibwdt_remove,
	.shutdown	= ibwdt_shutdown,
	.driver		= {
		.name	= DRV_NAME,
	},
};

static int __init ibwdt_init(void)
{
	int err;

	pr_info("WDT driver for IB700 single board computer initialising\n");

	ibwdt_platform_device = platform_device_register_simple(DRV_NAME,
								-1, NULL, 0);
	if (IS_ERR(ibwdt_platform_device))
		return PTR_ERR(ibwdt_platform_device);

	err = platform_driver_probe(&ibwdt_driver, ibwdt_probe);
	if (err)
		goto unreg_platform_device;

	return 0;

unreg_platform_device:
	platform_device_unregister(ibwdt_platform_device);
	return err;
}

static void __exit ibwdt_exit(void)
{
	platform_device_unregister(ibwdt_platform_device);
	platform_driver_unregister(&ibwdt_driver);
	pr_info("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");

/* end of ib700wdt.c */
Commit	Line	Data
d0173278	1	// SPDX-License-Identifier: GPL-2.0+
1da177e4 LT	2	/*
	3	* IB700 Single Board Computer WDT driver
	4	*
	5	* (c) Copyright 2001 Charles Howes <chowes@vsol.net>
	6	*
c9d7710e WVS	7	* Based on advantechwdt.c which is based on acquirewdt.c which
c9d7710e WVS	8	* is based on wdt.c.
1da177e4 LT	9	*
	10	* (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
	11	*
	12	* Based on acquirewdt.c which is based on wdt.c.
	13	* Original copyright messages:
	14	*
29fa0586 AC	15	* (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
29fa0586 AC	16	* All Rights Reserved.
1da177e4	17	*
1da177e4 LT	18	* Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
	19	* warranty for any of this software. This material is provided
	20	* "AS-IS" and at no charge.
	21	*
29fa0586	22	* (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
1da177e4	23	*
c9d7710e WVS	24	* 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
	25	* Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
	26	* Added timeout module option to override default
1da177e4 LT	27	*
	28	*/
	29
27c766aa JP	30	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27c766aa JP	31
1da177e4 LT	32	#include <linux/module.h>
	33	#include <linux/types.h>
	34	#include <linux/miscdevice.h>
	35	#include <linux/watchdog.h>
	36	#include <linux/ioport.h>
1da177e4	37	#include <linux/fs.h>
1da177e4 LT	38	#include <linux/init.h>
	39	#include <linux/spinlock.h>
	40	#include <linux/moduleparam.h>
745ac1ea	41	#include <linux/platform_device.h>
2e43ba73 AC	42	#include <linux/io.h>
2e43ba73 AC	43	#include <linux/uaccess.h>
089ab079	44
1da177e4	45
745ac1ea	46	static struct platform_device *ibwdt_platform_device;
1da177e4	47	static unsigned long ibwdt_is_open;
c7dfd0cc	48	static DEFINE_SPINLOCK(ibwdt_lock);
1da177e4 LT	49	static char expect_close;
1da177e4 LT	50
745ac1ea WVS	51	/* Module information */
745ac1ea WVS	52	#define DRV_NAME "ib700wdt"
1da177e4 LT	53
	54	/*
	55	*
	56	* Watchdog Timer Configuration
	57	*
	58	* The function of the watchdog timer is to reset the system
	59	* automatically and is defined at I/O port 0443H. To enable the
	60	* watchdog timer and allow the system to reset, write I/O port 0443H.
	61	* To disable the timer, write I/O port 0441H for the system to stop the
	62	* watchdog function. The timer has a tolerance of 20% for its
	63	* intervals.
	64	*
	65	* The following describes how the timer should be programmed.
	66	*
	67	* Enabling Watchdog:
	68	* MOV AX,000FH (Choose the values from 0 to F)
	69	* MOV DX,0443H
	70	* OUT DX,AX
	71	*
	72	* Disabling Watchdog:
	73	* MOV AX,000FH (Any value is fine.)
	74	* MOV DX,0441H
	75	* OUT DX,AX
	76	*
	77	* Watchdog timer control table:
	78	* Level Value Time/sec \| Level Value Time/sec
	79	* 1 F 0 \| 9 7 16
	80	* 2 E 2 \| 10 6 18
	81	* 3 D 4 \| 11 5 20
	82	* 4 C 6 \| 12 4 22
	83	* 5 B 8 \| 13 3 24
	84	* 6 A 10 \| 14 2 26
	85	* 7 9 12 \| 15 1 28
	86	* 8 8 14 \| 16 0 30
	87	*
	88	*/
	89
1da177e4 LT	90	#define WDT_STOP 0x441
	91	#define WDT_START 0x443
	92
	93	/* Default timeout */
794db26f WVS	94	#define WATCHDOG_TIMEOUT 30 /* 30 seconds +/- 20% */
	95	static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
	96	module_param(timeout, int, 0);
	97	MODULE_PARM_DESC(timeout,
	98	"Watchdog timeout in seconds. 0<= timeout <=30, default="
	99	__MODULE_STRING(WATCHDOG_TIMEOUT) ".");
1da177e4	100
86a1e189 WVS	101	static bool nowayout = WATCHDOG_NOWAYOUT;
86a1e189 WVS	102	module_param(nowayout, bool, 0);
2e43ba73 AC	103	MODULE_PARM_DESC(nowayout,
	104	"Watchdog cannot be stopped once started (default="
	105	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
1da177e4 LT	106
	107
	108	/*
35d55c94	109	* Watchdog Operations
1da177e4 LT	110	*/
1da177e4 LT	111
7944d3a5	112	static void ibwdt_ping(void)
1da177e4	113	{
794db26f WVS	114	int wd_margin = 15 - ((timeout + 1) / 2);
794db26f WVS	115
e42162a4 WVS	116	spin_lock(&ibwdt_lock);
e42162a4 WVS	117
1da177e4 LT	118	/* Write a watchdog value */
1da177e4 LT	119	outb_p(wd_margin, WDT_START);
e42162a4 WVS	120
e42162a4 WVS	121	spin_unlock(&ibwdt_lock);
1da177e4 LT	122	}
1da177e4 LT	123
7944d3a5	124	static void ibwdt_disable(void)
35d55c94	125	{
e42162a4	126	spin_lock(&ibwdt_lock);
35d55c94	127	outb_p(0, WDT_STOP);
e42162a4	128	spin_unlock(&ibwdt_lock);
35d55c94 WVS	129	}
35d55c94 WVS	130
7944d3a5	131	static int ibwdt_set_heartbeat(int t)
35d55c94	132	{
794db26f	133	if (t < 0 \|\| t > 30)
35d55c94 WVS	134	return -EINVAL;
35d55c94 WVS	135
794db26f	136	timeout = t;
35d55c94 WVS	137	return 0;
	138	}
	139
	140	/*
	141	* /dev/watchdog handling
	142	*/
	143
2e43ba73 AC	144	static ssize_t ibwdt_write(struct file file, const char __user buf,
2e43ba73 AC	145	size_t count, loff_t *ppos)
1da177e4 LT	146	{
	147	if (count) {
	148	if (!nowayout) {
	149	size_t i;
	150
	151	/* In case it was set long ago */
	152	expect_close = 0;
	153
	154	for (i = 0; i != count; i++) {
	155	char c;
	156	if (get_user(c, buf + i))
	157	return -EFAULT;
	158	if (c == 'V')
	159	expect_close = 42;
	160	}
	161	}
	162	ibwdt_ping();
	163	}
	164	return count;
	165	}
	166
2e43ba73	167	static long ibwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1da177e4	168	{
35d55c94	169	int new_margin;
1da177e4 LT	170	void __user argp = (void __user )arg;
	171	int __user *p = argp;
	172
42747d71	173	static const struct watchdog_info ident = {
2e43ba73 AC	174	.options = WDIOF_KEEPALIVEPING \| WDIOF_SETTIMEOUT
2e43ba73 AC	175	\| WDIOF_MAGICCLOSE,
1da177e4 LT	176	.firmware_version = 1,
	177	.identity = "IB700 WDT",
	178	};
	179
	180	switch (cmd) {
	181	case WDIOC_GETSUPPORT:
2e43ba73 AC	182	if (copy_to_user(argp, &ident, sizeof(ident)))
	183	return -EFAULT;
	184	break;
1da177e4 LT	185
1da177e4 LT	186	case WDIOC_GETSTATUS:
c9d7710e	187	case WDIOC_GETBOOTSTATUS:
2e43ba73	188	return put_user(0, p);
1da177e4	189
e42162a4 WVS	190	case WDIOC_SETOPTIONS:
e42162a4 WVS	191	{
2e43ba73	192	int options, retval = -EINVAL;
e42162a4	193
2e43ba73 AC	194	if (get_user(options, p))
2e43ba73 AC	195	return -EFAULT;
e42162a4	196
2e43ba73 AC	197	if (options & WDIOS_DISABLECARD) {
	198	ibwdt_disable();
	199	retval = 0;
	200	}
	201	if (options & WDIOS_ENABLECARD) {
	202	ibwdt_ping();
	203	retval = 0;
	204	}
	205	return retval;
e42162a4	206	}
0c06090c WVS	207	case WDIOC_KEEPALIVE:
	208	ibwdt_ping();
	209	break;
	210
	211	case WDIOC_SETTIMEOUT:
	212	if (get_user(new_margin, p))
	213	return -EFAULT;
	214	if (ibwdt_set_heartbeat(new_margin))
	215	return -EINVAL;
	216	ibwdt_ping();
bd490f82	217	fallthrough;
0c06090c WVS	218
0c06090c WVS	219	case WDIOC_GETTIMEOUT:
794db26f	220	return put_user(timeout, p);
0c06090c	221
1da177e4	222	default:
2e43ba73	223	return -ENOTTY;
1da177e4 LT	224	}
	225	return 0;
	226	}
	227
2e43ba73	228	static int ibwdt_open(struct inode inode, struct file file)
1da177e4	229	{
2e43ba73	230	if (test_and_set_bit(0, &ibwdt_is_open))
1da177e4	231	return -EBUSY;
1da177e4 LT	232	if (nowayout)
	233	__module_get(THIS_MODULE);
	234
	235	/* Activate */
	236	ibwdt_ping();
c5bf68fe	237	return stream_open(inode, file);
1da177e4 LT	238	}
1da177e4 LT	239
7944d3a5	240	static int ibwdt_close(struct inode inode, struct file file)
1da177e4	241	{
c9d7710e	242	if (expect_close == 42) {
35d55c94	243	ibwdt_disable();
c9d7710e	244	} else {
27c766aa	245	pr_crit("WDT device closed unexpectedly. WDT will not stop!\n");
c9d7710e WVS	246	ibwdt_ping();
c9d7710e WVS	247	}
1da177e4 LT	248	clear_bit(0, &ibwdt_is_open);
1da177e4 LT	249	expect_close = 0;
1da177e4 LT	250	return 0;
	251	}
	252
1da177e4 LT	253	/*
	254	* Kernel Interfaces
	255	*/
	256
62322d25	257	static const struct file_operations ibwdt_fops = {
1da177e4 LT	258	.owner = THIS_MODULE,
	259	.llseek = no_llseek,
	260	.write = ibwdt_write,
2e43ba73	261	.unlocked_ioctl = ibwdt_ioctl,
b6dfb247	262	.compat_ioctl = compat_ptr_ioctl,
1da177e4 LT	263	.open = ibwdt_open,
	264	.release = ibwdt_close,
	265	};
	266
	267	static struct miscdevice ibwdt_miscdev = {
	268	.minor = WATCHDOG_MINOR,
	269	.name = "watchdog",
	270	.fops = &ibwdt_fops,
	271	};
	272
f6e48039 WVS	273	/*
	274	* Init & exit routines
	275	*/
	276
996735ff	277	static int __init ibwdt_probe(struct platform_device *dev)
1da177e4 LT	278	{
	279	int res;
	280
1da177e4 LT	281	#if WDT_START != WDT_STOP
1da177e4 LT	282	if (!request_region(WDT_STOP, 1, "IB700 WDT")) {
27c766aa	283	pr_err("STOP method I/O %X is not available\n", WDT_STOP);
1da177e4 LT	284	res = -EIO;
	285	goto out_nostopreg;
	286	}
	287	#endif
	288
	289	if (!request_region(WDT_START, 1, "IB700 WDT")) {
27c766aa	290	pr_err("START method I/O %X is not available\n", WDT_START);
1da177e4 LT	291	res = -EIO;
	292	goto out_nostartreg;
	293	}
f6e48039	294
794db26f WVS	295	/* Check that the heartbeat value is within it's range ;
	296	* if not reset to the default */
	297	if (ibwdt_set_heartbeat(timeout)) {
	298	ibwdt_set_heartbeat(WATCHDOG_TIMEOUT);
27c766aa	299	pr_info("timeout value must be 0<=x<=30, using %d\n", timeout);
794db26f WVS	300	}
794db26f WVS	301
f6e48039 WVS	302	res = misc_register(&ibwdt_miscdev);
f6e48039 WVS	303	if (res) {
27c766aa	304	pr_err("failed to register misc device\n");
f6e48039 WVS	305	goto out_nomisc;
f6e48039 WVS	306	}
1da177e4 LT	307	return 0;
1da177e4 LT	308
f6e48039	309	out_nomisc:
1da177e4 LT	310	release_region(WDT_START, 1);
	311	out_nostartreg:
	312	#if WDT_START != WDT_STOP
	313	release_region(WDT_STOP, 1);
	314	#endif
	315	out_nostopreg:
1da177e4 LT	316	return res;
	317	}
	318
40529e7e	319	static void ibwdt_remove(struct platform_device *dev)
1da177e4 LT	320	{
1da177e4 LT	321	misc_deregister(&ibwdt_miscdev);
2e43ba73	322	release_region(WDT_START, 1);
1da177e4	323	#if WDT_START != WDT_STOP
2e43ba73	324	release_region(WDT_STOP, 1);
1da177e4	325	#endif
745ac1ea WVS	326	}
745ac1ea WVS	327
35fcf538 WVS	328	static void ibwdt_shutdown(struct platform_device *dev)
	329	{
	330	/* Turn the WDT off if we have a soft shutdown */
	331	ibwdt_disable();
	332	}
	333
745ac1ea	334	static struct platform_driver ibwdt_driver = {
40529e7e	335	.remove_new = ibwdt_remove,
35fcf538	336	.shutdown = ibwdt_shutdown,
745ac1ea	337	.driver = {
745ac1ea WVS	338	.name = DRV_NAME,
	339	},
	340	};
	341
	342	static int __init ibwdt_init(void)
	343	{
	344	int err;
	345
27c766aa	346	pr_info("WDT driver for IB700 single board computer initialising\n");
745ac1ea	347
2e43ba73 AC	348	ibwdt_platform_device = platform_device_register_simple(DRV_NAME,
2e43ba73 AC	349	-1, NULL, 0);
996735ff JD	350	if (IS_ERR(ibwdt_platform_device))
	351	return PTR_ERR(ibwdt_platform_device);
	352
	353	err = platform_driver_probe(&ibwdt_driver, ibwdt_probe);
	354	if (err)
	355	goto unreg_platform_device;
745ac1ea WVS	356
	357	return 0;
	358
996735ff JD	359	unreg_platform_device:
996735ff JD	360	platform_device_unregister(ibwdt_platform_device);
745ac1ea WVS	361	return err;
	362	}
	363
	364	static void __exit ibwdt_exit(void)
	365	{
	366	platform_device_unregister(ibwdt_platform_device);
	367	platform_driver_unregister(&ibwdt_driver);
27c766aa	368	pr_info("Watchdog Module Unloaded\n");
1da177e4 LT	369	}
	370
	371	module_init(ibwdt_init);
	372	module_exit(ibwdt_exit);
	373
	374	MODULE_AUTHOR("Charles Howes <chowes@vsol.net>");
	375	MODULE_DESCRIPTION("IB700 SBC watchdog driver");
	376	MODULE_LICENSE("GPL");
1da177e4 LT	377
1da177e4 LT	378	/* end of ib700wdt.c */