[deliverable/linux.git] / drivers / char / 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/notifier.h>
#include <linux/fs.h>
#include <linux/reboot.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 spinlock_t 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;
}

/*
 *	Notifier for system down
 */

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

/*
 *	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,
};

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

static struct notifier_block ibwdt_notifier = {
	.notifier_call = ibwdt_notify_sys,
};

/*
 *	Init & exit routines
 */

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

	spin_lock_init(&ibwdt_lock);

#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 = register_reboot_notifier(&ibwdt_notifier);
	if (res) {
		printk (KERN_ERR PFX "Failed to register reboot notifier.\n");
		goto out_noreboot;
	}

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

out_nomisc:
	unregister_reboot_notifier(&ibwdt_notifier);
out_noreboot:
	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);
	unregister_reboot_notifier(&ibwdt_notifier);
	release_region(WDT_START,1);
#if WDT_START != WDT_STOP
	release_region(WDT_STOP,1);
#endif
	return 0;
}

static struct platform_driver ibwdt_driver = {
	.probe		= ibwdt_probe,
	.remove		= __devexit_p(ibwdt_remove),
	.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>
	39	#include <linux/notifier.h>
	40	#include <linux/fs.h>
	41	#include <linux/reboot.h>
	42	#include <linux/init.h>
	43	#include <linux/spinlock.h>
	44	#include <linux/moduleparam.h>
745ac1ea	45	#include <linux/platform_device.h>
1da177e4 LT	46
	47	#include <asm/io.h>
	48	#include <asm/uaccess.h>
	49	#include <asm/system.h>
	50
745ac1ea	51	static struct platform_device *ibwdt_platform_device;
1da177e4 LT	52	static unsigned long ibwdt_is_open;
	53	static spinlock_t ibwdt_lock;
	54	static char expect_close;
	55
745ac1ea WVS	56	/* Module information */
	57	#define DRV_NAME "ib700wdt"
	58	#define PFX DRV_NAME ": "
1da177e4 LT	59
	60	/*
	61	*
	62	* Watchdog Timer Configuration
	63	*
	64	* The function of the watchdog timer is to reset the system
	65	* automatically and is defined at I/O port 0443H. To enable the
	66	* watchdog timer and allow the system to reset, write I/O port 0443H.
	67	* To disable the timer, write I/O port 0441H for the system to stop the
	68	* watchdog function. The timer has a tolerance of 20% for its
	69	* intervals.
	70	*
	71	* The following describes how the timer should be programmed.
	72	*
	73	* Enabling Watchdog:
	74	* MOV AX,000FH (Choose the values from 0 to F)
	75	* MOV DX,0443H
	76	* OUT DX,AX
	77	*
	78	* Disabling Watchdog:
	79	* MOV AX,000FH (Any value is fine.)
	80	* MOV DX,0441H
	81	* OUT DX,AX
	82	*
	83	* Watchdog timer control table:
	84	* Level Value Time/sec \| Level Value Time/sec
	85	* 1 F 0 \| 9 7 16
	86	* 2 E 2 \| 10 6 18
	87	* 3 D 4 \| 11 5 20
	88	* 4 C 6 \| 12 4 22
	89	* 5 B 8 \| 13 3 24
	90	* 6 A 10 \| 14 2 26
	91	* 7 9 12 \| 15 1 28
	92	* 8 8 14 \| 16 0 30
	93	*
	94	*/
	95
	96	static int wd_times[] = {
	97	30, /* 0x0 */
	98	28, /* 0x1 */
	99	26, /* 0x2 */
	100	24, /* 0x3 */
	101	22, /* 0x4 */
	102	20, /* 0x5 */
	103	18, /* 0x6 */
	104	16, /* 0x7 */
	105	14, /* 0x8 */
	106	12, /* 0x9 */
	107	10, /* 0xA */
	108	8, /* 0xB */
	109	6, /* 0xC */
	110	4, /* 0xD */
	111	2, /* 0xE */
	112	0, /* 0xF */
	113	};
	114
	115	#define WDT_STOP 0x441
	116	#define WDT_START 0x443
	117
	118	/* Default timeout */
	119	#define WD_TIMO 0 /* 30 seconds +/- 20%, from table */
	120
	121	static int wd_margin = WD_TIMO;
	122
4bfdf378	123	static int nowayout = WATCHDOG_NOWAYOUT;
1da177e4	124	module_param(nowayout, int, 0);
bffda5c8	125	MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
1da177e4 LT	126
	127
	128	/*
35d55c94	129	* Watchdog Operations
1da177e4 LT	130	*/
	131
	132	static void
	133	ibwdt_ping(void)
	134	{
e42162a4 WVS	135	spin_lock(&ibwdt_lock);
e42162a4 WVS	136
1da177e4 LT	137	/* Write a watchdog value */
1da177e4 LT	138	outb_p(wd_margin, WDT_START);
e42162a4 WVS	139
e42162a4 WVS	140	spin_unlock(&ibwdt_lock);
1da177e4 LT	141	}
1da177e4 LT	142
35d55c94 WVS	143	static void
	144	ibwdt_disable(void)
	145	{
e42162a4	146	spin_lock(&ibwdt_lock);
35d55c94	147	outb_p(0, WDT_STOP);
e42162a4	148	spin_unlock(&ibwdt_lock);
35d55c94 WVS	149	}
	150
	151	static int
	152	ibwdt_set_heartbeat(int t)
	153	{
	154	int i;
	155
	156	if ((t < 0) \|\| (t > 30))
	157	return -EINVAL;
	158
	159	for (i = 0x0F; i > -1; i--)
	160	if (wd_times[i] > t)
	161	break;
	162	wd_margin = i;
	163	return 0;
	164	}
	165
	166	/*
	167	* /dev/watchdog handling
	168	*/
	169
1da177e4 LT	170	static ssize_t
	171	ibwdt_write(struct file file, const char __user buf, size_t count, loff_t *ppos)
	172	{
	173	if (count) {
	174	if (!nowayout) {
	175	size_t i;
	176
	177	/* In case it was set long ago */
	178	expect_close = 0;
	179
	180	for (i = 0; i != count; i++) {
	181	char c;
	182	if (get_user(c, buf + i))
	183	return -EFAULT;
	184	if (c == 'V')
	185	expect_close = 42;
	186	}
	187	}
	188	ibwdt_ping();
	189	}
	190	return count;
	191	}
	192
	193	static int
	194	ibwdt_ioctl(struct inode inode, struct file file, unsigned int cmd,
	195	unsigned long arg)
	196	{
35d55c94	197	int new_margin;
1da177e4 LT	198	void __user argp = (void __user )arg;
	199	int __user *p = argp;
	200
	201	static struct watchdog_info ident = {
	202	.options = WDIOF_KEEPALIVEPING \| WDIOF_SETTIMEOUT \| WDIOF_MAGICCLOSE,
	203	.firmware_version = 1,
	204	.identity = "IB700 WDT",
	205	};
	206
	207	switch (cmd) {
	208	case WDIOC_GETSUPPORT:
	209	if (copy_to_user(argp, &ident, sizeof(ident)))
	210	return -EFAULT;
	211	break;
	212
	213	case WDIOC_GETSTATUS:
c9d7710e	214	case WDIOC_GETBOOTSTATUS:
1da177e4 LT	215	return put_user(0, p);
	216
	217	case WDIOC_KEEPALIVE:
	218	ibwdt_ping();
	219	break;
	220
	221	case WDIOC_SETTIMEOUT:
	222	if (get_user(new_margin, p))
	223	return -EFAULT;
35d55c94	224	if (ibwdt_set_heartbeat(new_margin))
1da177e4	225	return -EINVAL;
1da177e4 LT	226	ibwdt_ping();
	227	/* Fall */
	228
	229	case WDIOC_GETTIMEOUT:
	230	return put_user(wd_times[wd_margin], p);
e42162a4 WVS	231
	232	case WDIOC_SETOPTIONS:
	233	{
	234	int options, retval = -EINVAL;
	235
	236	if (get_user(options, p))
	237	return -EFAULT;
	238
	239	if (options & WDIOS_DISABLECARD) {
	240	ibwdt_disable();
	241	retval = 0;
	242	}
	243
	244	if (options & WDIOS_ENABLECARD) {
	245	ibwdt_ping();
	246	retval = 0;
	247	}
	248
	249	return retval;
	250	}
1da177e4 LT	251
1da177e4 LT	252	default:
795b89d2	253	return -ENOTTY;
1da177e4 LT	254	}
	255	return 0;
	256	}
	257
	258	static int
	259	ibwdt_open(struct inode inode, struct file file)
	260	{
1da177e4	261	if (test_and_set_bit(0, &ibwdt_is_open)) {
1da177e4 LT	262	return -EBUSY;
	263	}
	264	if (nowayout)
	265	__module_get(THIS_MODULE);
	266
	267	/* Activate */
	268	ibwdt_ping();
1da177e4 LT	269	return nonseekable_open(inode, file);
	270	}
	271
	272	static int
	273	ibwdt_close(struct inode inode, struct file file)
	274	{
c9d7710e	275	if (expect_close == 42) {
35d55c94	276	ibwdt_disable();
c9d7710e	277	} else {
1da177e4	278	printk(KERN_CRIT PFX "WDT device closed unexpectedly. WDT will not stop!\n");
c9d7710e WVS	279	ibwdt_ping();
c9d7710e WVS	280	}
1da177e4 LT	281	clear_bit(0, &ibwdt_is_open);
1da177e4 LT	282	expect_close = 0;
1da177e4 LT	283	return 0;
	284	}
	285
	286	/*
	287	* Notifier for system down
	288	*/
	289
	290	static int
	291	ibwdt_notify_sys(struct notifier_block *this, unsigned long code,
	292	void *unused)
	293	{
	294	if (code == SYS_DOWN \|\| code == SYS_HALT) {
	295	/* Turn the WDT off */
35d55c94	296	ibwdt_disable();
1da177e4 LT	297	}
	298	return NOTIFY_DONE;
	299	}
	300
	301	/*
	302	* Kernel Interfaces
	303	*/
	304
62322d25	305	static const struct file_operations ibwdt_fops = {
1da177e4 LT	306	.owner = THIS_MODULE,
	307	.llseek = no_llseek,
	308	.write = ibwdt_write,
	309	.ioctl = ibwdt_ioctl,
	310	.open = ibwdt_open,
	311	.release = ibwdt_close,
	312	};
	313
	314	static struct miscdevice ibwdt_miscdev = {
	315	.minor = WATCHDOG_MINOR,
	316	.name = "watchdog",
	317	.fops = &ibwdt_fops,
	318	};
	319
	320	/*
	321	* The WDT needs to learn about soft shutdowns in order to
	322	* turn the timebomb registers off.
	323	*/
	324
	325	static struct notifier_block ibwdt_notifier = {
	326	.notifier_call = ibwdt_notify_sys,
	327	};
	328
f6e48039 WVS	329	/*
	330	* Init & exit routines
	331	*/
	332
745ac1ea	333	static int __devinit ibwdt_probe(struct platform_device *dev)
1da177e4 LT	334	{
	335	int res;
	336
1da177e4	337	spin_lock_init(&ibwdt_lock);
1da177e4 LT	338
	339	#if WDT_START != WDT_STOP
	340	if (!request_region(WDT_STOP, 1, "IB700 WDT")) {
	341	printk (KERN_ERR PFX "STOP method I/O %X is not available.\n", WDT_STOP);
	342	res = -EIO;
	343	goto out_nostopreg;
	344	}
	345	#endif
	346
	347	if (!request_region(WDT_START, 1, "IB700 WDT")) {
	348	printk (KERN_ERR PFX "START method I/O %X is not available.\n", WDT_START);
	349	res = -EIO;
	350	goto out_nostartreg;
	351	}
f6e48039	352
1da177e4 LT	353	res = register_reboot_notifier(&ibwdt_notifier);
	354	if (res) {
	355	printk (KERN_ERR PFX "Failed to register reboot notifier.\n");
	356	goto out_noreboot;
	357	}
f6e48039 WVS	358
	359	res = misc_register(&ibwdt_miscdev);
	360	if (res) {
	361	printk (KERN_ERR PFX "failed to register misc device\n");
	362	goto out_nomisc;
	363	}
1da177e4 LT	364	return 0;
1da177e4 LT	365
f6e48039 WVS	366	out_nomisc:
f6e48039 WVS	367	unregister_reboot_notifier(&ibwdt_notifier);
1da177e4 LT	368	out_noreboot:
	369	release_region(WDT_START, 1);
	370	out_nostartreg:
	371	#if WDT_START != WDT_STOP
	372	release_region(WDT_STOP, 1);
	373	#endif
	374	out_nostopreg:
1da177e4 LT	375	return res;
	376	}
	377
745ac1ea	378	static int __devexit ibwdt_remove(struct platform_device *dev)
1da177e4 LT	379	{
	380	misc_deregister(&ibwdt_miscdev);
	381	unregister_reboot_notifier(&ibwdt_notifier);
f6e48039	382	release_region(WDT_START,1);
1da177e4 LT	383	#if WDT_START != WDT_STOP
	384	release_region(WDT_STOP,1);
	385	#endif
745ac1ea WVS	386	return 0;
	387	}
	388
	389	static struct platform_driver ibwdt_driver = {
	390	.probe = ibwdt_probe,
	391	.remove = __devexit_p(ibwdt_remove),
	392	.driver = {
	393	.owner = THIS_MODULE,
	394	.name = DRV_NAME,
	395	},
	396	};
	397
	398	static int __init ibwdt_init(void)
	399	{
	400	int err;
	401
	402	printk(KERN_INFO PFX "WDT driver for IB700 single board computer initialising.\n");
	403
	404	err = platform_driver_register(&ibwdt_driver);
	405	if (err)
	406	return err;
	407
	408	ibwdt_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
	409	if (IS_ERR(ibwdt_platform_device)) {
	410	err = PTR_ERR(ibwdt_platform_device);
	411	goto unreg_platform_driver;
	412	}
	413
	414	return 0;
	415
	416	unreg_platform_driver:
	417	platform_driver_unregister(&ibwdt_driver);
	418	return err;
	419	}
	420
	421	static void __exit ibwdt_exit(void)
	422	{
	423	platform_device_unregister(ibwdt_platform_device);
	424	platform_driver_unregister(&ibwdt_driver);
	425	printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
1da177e4 LT	426	}
	427
	428	module_init(ibwdt_init);
	429	module_exit(ibwdt_exit);
	430
	431	MODULE_AUTHOR("Charles Howes <chowes@vsol.net>");
	432	MODULE_DESCRIPTION("IB700 SBC watchdog driver");
	433	MODULE_LICENSE("GPL");
	434	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
	435
	436	/* end of ib700wdt.c */