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Commit 00b3b3e6 authored by Sven Anders & Marcus Junker's avatar Sven Anders & Marcus Junker Committed by Wim Van Sebroeck
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[WATCHDOG] NS pc87413-wdt Watchdog driver v1.1



Change the driver for proper spin_locking,
remove the TEMP_MINOR stuff,
make sure the device works as a Virtual File System
that is non_seekable,
...

Signed-off-by: default avatarSven Anders <anders@anduras.de>
Signed-off-by: default avatarMarcus Junker <junker@anduras.de>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 789fc0ad
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+330 −304
Original line number Diff line number Diff line
/*
 *      NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x
 *
 *      This code is based on wdt.c with original copyright
 *      This code is based on wdt.c with original copyright.
 *
 *      (C) Copyright 2006 Marcus Junker, <junker@anduras.de>
 *                     and Sven Anders, <anders@anduras.de>
 *      (C) Copyright 2006 Sven Anders, <anders@anduras.de>
 *                     and Marcus Junker, <junker@anduras.de>
 *
 *      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 Marcus Junker, Sven Anders nor ANDURAS AG
 *      Neither Sven Anders, Marcus Junker nor ANDURAS AG
 *      admit liability nor provide warranty for any of this software.
 *      This material is provided "AS-IS" and at no charge.
 *
 *      Release 1.00.
 *
 *      Release 1.1
 */


/* #define DEBUG 1 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
@@ -41,11 +37,17 @@
#include <asm/uaccess.h>
#include <asm/system.h>

#define WATCHDOG_NAME "pc87413 WDT"
#define PFX WATCHDOG_NAME ": "
#define DPFX WATCHDOG_NAME " - DEBUG: "
/* #define DEBUG 1 */

#define DEFAULT_TIMEOUT     1            /* 1 minute */
#define MAX_TIMEOUT         255

#define VERSION             "1.1"
#define MODNAME             "pc87413 WDT"
#define PFX                 MODNAME ": "
#define DPFX                MODNAME " - DEBUG: "

#define WDT_INDEX_IO_PORT   (io+0)                /* */
#define WDT_INDEX_IO_PORT   (io+0)       /* I/O port base (index register) */
#define WDT_DATA_IO_PORT    (WDT_INDEX_IO_PORT+1)
#define SWC_LDN             0x04
#define SIOCFG2             0x22         /* Serial IO register */
@@ -53,45 +55,26 @@
#define WDTO                0x11         /* Watchdog timeout register */
#define WDCFG               0x12         /* Watchdog config register */

#define WD_TIMEOUT 1				   /* minutes (1 ... 255) */
static int io = 0x2E;		         /* Address used on Portwell Boards */

static int timeout = DEFAULT_TIMEOUT;    /* timeout value */
static unsigned long timer_enabled = 0;  /* is the timer enabled? */

static int pc87413_is_open=0;
static char expect_close;                /* is the close expected? */

/*
 *	You must set these - there is no sane way to probe for this board.
 *	You can use pc87413=x to set these now.
 */
static spinlock_t io_lock;               /* to guard the watchdog from io races */

static int nowayout = WATCHDOG_NOWAYOUT;

/* -- Low level function ----------------------------------------*/

/**
 *	module_params
 *
 *	Setup options. The board isn't really probe-able so we have to
 *	get the user to tell us the configuration.
 */

static int io=0x2E;		/* Normally used addres on Portwell Boards */
module_param(io, int, 0);
MODULE_PARM_DESC(wdt_io, WATCHDOG_NAME  " io port (default 0x2E)");
/* Select pins for Watchdog output */

static int timeout = WD_TIMEOUT;  /* in minutes */
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes. 1<= timeout <=63, default=" __MODULE_STRING(WD_TIMEOUT) ".");


/******************************************
 *      Helper functions
 ******************************************/

static void
pc87413_select_wdt_out (void)
static inline void pc87413_select_wdt_out (void)
{

	unsigned int cr_data = 0;

	/* Select multiple pin,pin55,as WDT output */
	/* Step 1: Select multiple pin,pin55,as WDT output */

	outb_p(SIOCFG2, WDT_INDEX_IO_PORT);

@@ -102,16 +85,16 @@ pc87413_select_wdt_out (void)

	outb_p(cr_data, WDT_DATA_IO_PORT);


#ifdef DEBUG
	printk(KERN_INFO DPFX "Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n", cr_data);
	printk(KERN_INFO DPFX "Select multiple pin,pin55,as WDT output:"
	                      " Bit7 to 1: %d\n", cr_data);
#endif
}

static void
pc87413_enable_swc(void)
{
/* Enable SWC functions */

static inline void pc87413_enable_swc(void)
{
	unsigned int cr_data=0;

	/* Step 2: Enable SWC functions */
@@ -130,8 +113,9 @@ pc87413_enable_swc(void)
#endif
}

static unsigned int
pc87413_get_swc_base(void)
/* Read SWC I/O base address */

static inline unsigned int pc87413_get_swc_base(void)
{
	unsigned int  swc_base_addr = 0;
	unsigned char addr_l, addr_h = 0;
@@ -145,18 +129,19 @@ pc87413_get_swc_base(void)

	addr_l = inb(WDT_DATA_IO_PORT);


	swc_base_addr = (addr_h << 8) + addr_l;

#ifdef DEBUG
	printk(KERN_INFO DPFX "Read SWC I/O Base Address:  low %d, high %d, res %d\n", addr_l, addr_h, swc_base_addr);
	printk(KERN_INFO DPFX "Read SWC I/O Base Address: low %d, high %d,"
	                      " res %d\n", addr_l, addr_h, swc_base_addr);
#endif

	return swc_base_addr;
}

static void
pc87413_swc_bank3(unsigned int swc_base_addr)
/* Select Bank 3 of SWC */

static inline void pc87413_swc_bank3(unsigned int swc_base_addr)
{
	/* Step 4: Select Bank3 of SWC */

@@ -165,11 +150,12 @@ pc87413_swc_bank3(unsigned int swc_base_addr)
#ifdef DEBUG
	printk(KERN_INFO DPFX "Select Bank3 of SWC\n");
#endif

}

static void
pc87413_programm_wdto (unsigned int swc_base_addr, char pc87413_time)
/* Set watchdog timeout to x minutes */

static inline void pc87413_programm_wdto(unsigned int swc_base_addr,
					 char pc87413_time)
{
	/* Step 5: Programm WDTO, Twd. */

@@ -180,8 +166,9 @@ pc87413_programm_wdto (unsigned int swc_base_addr, char pc87413_time)
#endif
}

static void
pc87413_enable_wden (unsigned int swc_base_addr)
/* Enable WDEN */

static inline void pc87413_enable_wden(unsigned int swc_base_addr)
{
	/* Step 6: Enable WDEN */

@@ -192,8 +179,8 @@ pc87413_enable_wden (unsigned int swc_base_addr)
#endif
}

static void
pc87413_enable_sw_wd_tren (unsigned int swc_base_addr)
/* Enable SW_WD_TREN */
static inline void pc87413_enable_sw_wd_tren(unsigned int swc_base_addr)
{
	/* Enable SW_WD_TREN */

@@ -204,8 +191,9 @@ pc87413_enable_sw_wd_tren (unsigned int swc_base_addr)
#endif
}

static void
pc87413_disable_sw_wd_tren (unsigned int swc_base_addr)
/* Disable SW_WD_TREN */

static inline void pc87413_disable_sw_wd_tren(unsigned int swc_base_addr)
{
	/* Disable SW_WD_TREN */

@@ -216,11 +204,10 @@ pc87413_disable_sw_wd_tren (unsigned int swc_base_addr)
#endif
}

/* Enable SW_WD_TRG */

static void
pc87413_enable_sw_wd_trg (unsigned int swc_base_addr)
static inline void pc87413_enable_sw_wd_trg(unsigned int swc_base_addr)
{

	/* Enable SW_WD_TRG */

	outb_p(inb (swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL);
@@ -230,10 +217,10 @@ pc87413_enable_sw_wd_trg (unsigned int swc_base_addr)
#endif
}

static void
pc87413_disable_sw_wd_trg (unsigned int swc_base_addr)
{
/* Disable SW_WD_TRG */

static inline void pc87413_disable_sw_wd_trg(unsigned int swc_base_addr)
{
	/* Disable SW_WD_TRG */

	outb_p(inb (swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL);
@@ -243,127 +230,177 @@ pc87413_disable_sw_wd_trg (unsigned int swc_base_addr)
#endif
}

/* -- Higher level functions ------------------------------------*/

/* Enable the watchdog */

static void
pc87413_disable(void)
static void pc87413_enable(void)
{
	unsigned int swc_base_addr;

	spin_lock(&io_lock);

	pc87413_select_wdt_out();
	pc87413_enable_swc();
	swc_base_addr = pc87413_get_swc_base();
	pc87413_swc_bank3(swc_base_addr);
	pc87413_disable_sw_wd_tren(swc_base_addr);
	pc87413_disable_sw_wd_trg(swc_base_addr);
	pc87413_programm_wdto(swc_base_addr, 0);
	pc87413_programm_wdto(swc_base_addr, timeout);
	pc87413_enable_wden(swc_base_addr);
	pc87413_enable_sw_wd_tren(swc_base_addr);
	pc87413_enable_sw_wd_trg(swc_base_addr);

	spin_unlock(&io_lock);
}

/* Disable the watchdog */

static void
pc87413_refresh(char pc87413_time)
static void pc87413_disable(void)
{
	unsigned int swc_base_addr;

	spin_lock(&io_lock);

	pc87413_select_wdt_out();
	pc87413_enable_swc();
	swc_base_addr = pc87413_get_swc_base();
	pc87413_swc_bank3(swc_base_addr);
	pc87413_disable_sw_wd_tren(swc_base_addr);
	pc87413_disable_sw_wd_trg(swc_base_addr);
	pc87413_programm_wdto(swc_base_addr, pc87413_time);
	pc87413_enable_wden(swc_base_addr);
	pc87413_enable_sw_wd_tren(swc_base_addr);
	pc87413_enable_sw_wd_trg(swc_base_addr);
	pc87413_programm_wdto(swc_base_addr, 0);

	spin_unlock(&io_lock);
}

/* Refresh the watchdog */

static void
pc87413_enable(char pc87413_time)
static void pc87413_refresh(void)
{
	unsigned int swc_base_addr;

	spin_lock(&io_lock);

	pc87413_select_wdt_out();
	pc87413_enable_swc();
	swc_base_addr = pc87413_get_swc_base();
	pc87413_swc_bank3(swc_base_addr);
	pc87413_programm_wdto(swc_base_addr, pc87413_time);
	pc87413_disable_sw_wd_tren(swc_base_addr);
	pc87413_disable_sw_wd_trg(swc_base_addr);
	pc87413_programm_wdto(swc_base_addr, timeout);
	pc87413_enable_wden(swc_base_addr);
	pc87413_enable_sw_wd_tren(swc_base_addr);
	pc87413_enable_sw_wd_trg(swc_base_addr);

	spin_unlock(&io_lock);
}

/* -- File operations -------------------------------------------*/

/**
 *	pc87413_open:
 *	@inode: inode of device
 *	@file: file handle to device
 *
 */

static int pc87413_open(struct inode *inode, struct file *file)
{
	/* /dev/watchdog can only be opened once */

	if (test_and_set_bit(0, &timer_enabled))
		return -EBUSY;

	if (nowayout)
		__module_get(THIS_MODULE);

/*******************************************
 *	Kernel methods.
 *******************************************/
	/* Reload and activate timer */
	pc87413_refresh();

	printk(KERN_INFO MODNAME "Watchdog enabled. Timeout set to"
	                         " %d minute(s).\n", timeout);

	return nonseekable_open(inode, file);
}

/**
 *	pc87413_status:
 *
 *	Extract the status information from a WDT watchdog device. There are
 *	several board variants so we have to know which bits are valid. Some
 *	bits default to one and some to zero in order to be maximally painful.
 *	pc87413_release:
 *	@inode: inode to board
 *	@file: file handle to board
 *
 *	we then map the bits onto the status ioctl flags.
 *	The watchdog has a configurable API. There is a religious dispute
 *	between people who want their watchdog to be able to shut down and
 *	those who want to be sure if the watchdog manager dies the machine
 *	reboots. In the former case we disable the counters, in the latter
 *	case you have to open it again very soon.
 */

static int pc87413_status(void)
static int pc87413_release(struct inode *inode, struct file *file)
{
	/* Not supported */
	/* Shut off the timer. */

	if (expect_close == 42) {
		pc87413_disable();
		printk(KERN_INFO MODNAME "Watchdog disabled,"
		                         " sleeping again...\n");
	} else {
		printk(KERN_CRIT MODNAME "Unexpected close, not stopping"
		                         " watchdog!\n");
		pc87413_refresh();
	}

	clear_bit(0, &timer_enabled);
	expect_close = 0;

	return 1;
	return 0;
}

static long long pc87413_llseek(struct file *file, long long offset, int origin)
/**
 *	pc87413_status:
 *
 *      return, if the watchdog is enabled (timeout is set...)
 */


static int pc87413_status(void)
{
	return -ESPIPE;
	  return 1; /* currently not supported */
}

/**
 *	pc87413_write:
 *	@file: file handle to the watchdog
 *	@buf: buffer to write (unused as data does not matter here
 *	@count: count of bytes
 *	@data: data buffer to write
 *	@len: length in bytes
 *	@ppos: pointer to the position to write. No seeks allowed
 *
 *	A write to a watchdog device is defined as a keepalive signal. Any
 *	write of data will do, as we we don't define content meaning.
 */

static ssize_t
pc87413_write (struct file *file, const char __user *buf, size_t count, loff_t *ppos)
static ssize_t pc87413_write(struct file *file, const char __user *data,
			     size_t len, loff_t *ppos)
{
	if (count) {
	        pc87413_refresh (WD_TIMEOUT);
	        #ifdef DEBUG
	        printk(KERN_INFO DPFX "Write\n");
	        #endif
	/* See if we got the magic character 'V' and reload the timer */
	if (len) {
		if (!nowayout) {
			size_t i;

			/* reset expect flag */
			expect_close = 0;

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

/*
 *      Read reports the temperature in degrees Fahrenheit.
 */
static ssize_t
pc87413_read(struct file *file, char *buf, size_t count, loff_t *ptr)
{

//	char timeout;
//
//	outb_p(0x08, WDT_EFER);		/* Select locical device 8 */
//	outb_p(0x0F6, WDT_EFER);		/* Select CRF6 */
//	timeout = inb(WDT_EFDR);	/* Read Timeout counter from CRF6 */


//	if(copy_to_user(buf,&timeout,1))
//		return -EFAULT;
	return 1;


		/* someone wrote to us, we should reload the timer */
		pc87413_refresh();
	}
	return len;
}

/**
@@ -378,103 +415,92 @@ pc87413_read(struct file *file, char *buf, size_t count, loff_t *ptr)
 *	querying capabilities and current status.
 */

static int
pc87413_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
	unsigned long arg)
{
	static struct watchdog_info ident=
static int pc87413_ioctl(struct inode *inode, struct file *file,
			 unsigned int cmd, unsigned long arg)
{
	        .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
	int new_timeout;

	union {
		struct watchdog_info __user *ident;
		int __user *i;
	} uarg;

	static struct watchdog_info ident = {
		.options          = WDIOF_KEEPALIVEPING |
		                    WDIOF_SETTIMEOUT |
		                    WDIOF_MAGICCLOSE,
		.firmware_version = 1,
		.identity = "pc87413(HF/F)"
		.identity         = "PC87413(HF/F) watchdog"
	};

	ident.options=1;	/* Mask down to the card we have */
	uarg.i = (int __user *)arg;

	switch(cmd)
	{
	switch(cmd) {
		default:
			return -ENOIOCTLCMD;
			return -ENOTTY;

		case WDIOC_GETSUPPORT:
			return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;
			return copy_to_user(uarg.ident, &ident,
				sizeof(ident)) ? -EFAULT : 0;

		case WDIOC_GETSTATUS:
			return put_user(pc87413_status(),(int *)arg);
			return put_user(pc87413_status(), uarg.i);

		case WDIOC_GETBOOTSTATUS:
			return put_user(0, (int *)arg);
			return put_user(0, uarg.i);

		case WDIOC_KEEPALIVE:
			pc87413_refresh(WD_TIMEOUT);
			pc87413_refresh();
#ifdef DEBUG
	                printk(KERN_INFO DPFX "keepalive\n");
#endif
			return 0;
	}
}

/**
 *	pc87413_open:
 *	@inode: inode of device
 *	@file: file handle to device
 *
 *	One of our two misc devices has been opened. The watchdog device is
 *	single open and on opening we load the counters. Counter zero is a
 *	100Hz cascade, into counter 1 which downcounts to reboot. When the
 *	counter triggers counter 2 downcounts the length of the reset pulse
 *	which set set to be as long as possible.
 */
		case WDIOC_SETTIMEOUT:
			if (get_user(new_timeout, uarg.i))
				return -EFAULT;

static int
pc87413_open(struct inode *inode, struct file *file)
{
	switch(MINOR(inode->i_rdev))
	{
		case WATCHDOG_MINOR:
			if(pc87413_is_open)
				return -EBUSY;
			/*
			 *	Activate
			 */
			// the API states this is given in secs
			new_timeout /= 60;

			pc87413_is_open=1;
			pc87413_refresh(WD_TIMEOUT);
			#ifdef DEBUG
			printk(KERN_INFO DPFX "Open\n");
			#endif
			return 0;
		case TEMP_MINOR:
			return 0;
		default:
			return -ENODEV;
	}
}
			if (new_timeout < 0 || new_timeout > MAX_TIMEOUT)
				return -EINVAL;

/**
 *	pc87413_close:
 *	@inode: inode to board
 *	@file: file handle to board
 *
 *	The watchdog has a configurable API. There is a religious dispute
 *	between people who want their watchdog to be able to shut down and
 *	those who want to be sure if the watchdog manager dies the machine
 *	reboots. In the former case we disable the counters, in the latter
 *	case you have to open it again very soon.
 */
			timeout = new_timeout;
			pc87413_refresh();

static int
pc87413_release(struct inode *inode, struct file *file)
{
	if(MINOR(inode->i_rdev)==WATCHDOG_MINOR)
			// fall through and return the new timeout...

		case WDIOC_GETTIMEOUT:

		        new_timeout = timeout * 60;

			return put_user(new_timeout, uarg.i);

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

			if (get_user(options, uarg.i))
				return -EFAULT;

			if (options & WDIOS_DISABLECARD) {
			        pc87413_disable();
#endif
		pc87413_is_open=0;
		#ifdef DEBUG
		printk(KERN_INFO DPFX "Release\n");
		#endif
				retval = 0;
			}
	return 0;

			if (options & WDIOS_ENABLECARD) {
				pc87413_enable();
				retval = 0;
			}

			return retval;
		}
	}
}

/* -- Notifier funtions -----------------------------------------*/

/**
 *	notify_sys:
 *	@this: our notifier block
@@ -487,8 +513,8 @@ pc87413_release(struct inode *inode, struct file *file)
 *	trust me - if it happens it does suck.
 */

static int
pc87413_notify_sys(struct notifier_block *this, unsigned long code,
static int pc87413_notify_sys(struct notifier_block *this,
			      unsigned long code,
			      void *unused)
{
	if (code == SYS_DOWN || code == SYS_HALT)
@@ -499,22 +525,22 @@ pc87413_notify_sys(struct notifier_block *this, unsigned long code,
	return NOTIFY_DONE;
}


/*****************************************************
 *	Kernel Interfaces
 *****************************************************/

/* -- Module's structures ---------------------------------------*/

static struct file_operations pc87413_fops = {
	.owner		= THIS_MODULE,
	.llseek		= pc87413_llseek,
	.read		= pc87413_read,
	.llseek		= no_llseek,
	.write		= pc87413_write,
	.ioctl		= pc87413_ioctl,
	.open		= pc87413_open,
	.release	= pc87413_release,
};

static struct notifier_block pc87413_notifier =
{
	.notifier_call  = pc87413_notify_sys,
};

static struct miscdevice pc87413_miscdev=
{
	.minor          = WATCHDOG_MINOR,
@@ -522,66 +548,32 @@ static struct miscdevice pc87413_miscdev=
	.fops           = &pc87413_fops
};

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

static struct notifier_block pc87413_notifier=
{
	pc87413_notify_sys,
	NULL,
	0
};

/* -- Module init functions -------------------------------------*/

/**
 *	pc87413_exit:
 *
 *	Unload the watchdog. You cannot do this with any file handles open.
 *	If your watchdog is set to continue ticking on close and you unload
 *	it, well it keeps ticking. We won't get the interrupt but the board
 *	will not touch PC memory so all is fine. You just have to load a new
 *	module in 60 seconds or reboot.
 */

static void
pc87413_exit(void)
{
	pc87413_disable();
	misc_deregister(&pc87413_miscdev);
	unregister_reboot_notifier(&pc87413_notifier);
	/* release_region(io,2); */
}


/**
 * 	pc87413_init:
 * 	pc87413_init: module's "constructor"
 *
 *	Set up the WDT watchdog board. All we have to do is grab the
 *	resources we require and bitch if anyone beat us to them.
 *	The open() function will actually kick the board off.
 */

static int
pc87413_init(void)
static int __init pc87413_init(void)
{
	int ret;

	printk(KERN_INFO PFX "Version 1.00 at io 0x%X\n", WDT_INDEX_IO_PORT);
	spin_lock_init(&io_lock);

	printk(KERN_INFO PFX "Version " VERSION " at io 0x%X\n", WDT_INDEX_IO_PORT);

	/* request_region(io, 2, "pc87413"); */


	ret = register_reboot_notifier(&pc87413_notifier);
	if (ret != 0) {
		printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
			ret);
	}



	ret = misc_register(&pc87413_miscdev);

	if (ret != 0) {
@@ -593,18 +585,52 @@ pc87413_init(void)

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


	pc87413_enable(WD_TIMEOUT);
	pc87413_enable();

	return 0;
}

/**
 *	pc87413_exit: module's "destructor"
 *
 *	Unload the watchdog. You cannot do this with any file handles open.
 *	If your watchdog is set to continue ticking on close and you unload
 *	it, well it keeps ticking. We won't get the interrupt but the board
 *	will not touch PC memory so all is fine. You just have to load a new
 *	module in 60 seconds or reboot.
 */

static void __exit pc87413_exit(void)
{
	/* Stop the timer before we leave */
	if (!nowayout)
	{
		pc87413_disable();
		printk(KERN_INFO MODNAME "Watchdog disabled.\n");
	}

	misc_deregister(&pc87413_miscdev);
	unregister_reboot_notifier(&pc87413_notifier);
	/* release_region(io,2); */

	printk(MODNAME " watchdog component driver removed.\n");
}

module_init(pc87413_init);
module_exit(pc87413_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marcus Junker <junker@anduras.de>, Sven Anders <anders@anduras.de>");
MODULE_AUTHOR("Sven Anders <anders@anduras.de>, Marcus Junker <junker@anduras.de>,");
MODULE_DESCRIPTION("PC87413 WDT driver");
MODULE_LICENSE("GPL");

MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

module_param(io, int, 0);
MODULE_PARM_DESC(wdt_io, MODNAME " I/O port (default: " __MODULE_STRING(io) ").");

module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes (default=" __MODULE_STRING(timeout) ").");

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