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Commit 96cb4eb0 authored by Giel van Schijndel's avatar Giel van Schijndel Committed by Wim Van Sebroeck
Browse files

watchdog: f71808e_wdt: new watchdog driver for Fintek F71808E and F71882FG 



Add a new watchdog driver for the Fintek F71808E and F71882FG Super I/O
controllers.

Signed-off-by: default avatarGiel van Schijndel <me@mortis.eu>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 4c4b638e

drivers/watchdog/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -401,6 +401,17 @@ config ALIM7101_WDT 


	  Most people will say N.



config F71808E_WDT

	tristate "Fintek F71808E and F71882FG Watchdog"

	depends on X86 && EXPERIMENTAL

	help

	  This is the driver for the hardware watchdog on the Fintek

	  F71808E and F71882FG Super I/O controllers.



	  You can compile this driver directly into the kernel, or use

	  it as a module.  The module will be called f71808e_wdt.





config GEODE_WDT

	tristate "AMD Geode CS5535/CS5536 Watchdog"

	depends on CS5535_MFGPT

drivers/watchdog/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -66,6 +66,7 @@ obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o 
obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o

obj-$(CONFIG_ALIM1535_WDT) += alim1535_wdt.o

obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o

obj-$(CONFIG_F71808E_WDT) += f71808e_wdt.o

obj-$(CONFIG_GEODE_WDT) += geodewdt.o

obj-$(CONFIG_SC520_WDT) += sc520_wdt.o

obj-$(CONFIG_SBC_FITPC2_WATCHDOG) += sbc_fitpc2_wdt.o

drivers/watchdog/f71808e_wdt.c

0 → 100644
+768 −0
Original line number Diff line number Diff line 
/***************************************************************************

 *   Copyright (C) 2006 by Hans Edgington <hans@edgington.nl>              *

 *   Copyright (C) 2007-2009 Hans de Goede <hdegoede@redhat.com>           *

 *   Copyright (C) 2010 Giel van Schijndel <me@mortis.eu>                  *

 *                                                                         *

 *   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.                                   *

 *                                                                         *

 *   This program is distributed in the hope that it will be useful,       *

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *

 *   GNU General Public License for more details.                          *

 *                                                                         *

 *   You should have received a copy of the GNU General Public License     *

 *   along with this program; if not, write to the                         *

 *   Free Software Foundation, Inc.,                                       *

 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *

 ***************************************************************************/



#include <linux/err.h>

#include <linux/fs.h>

#include <linux/init.h>

#include <linux/io.h>

#include <linux/ioport.h>

#include <linux/miscdevice.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/notifier.h>

#include <linux/reboot.h>

#include <linux/uaccess.h>

#include <linux/watchdog.h>



#define DRVNAME "f71808e_wdt"



#define SIO_F71808FG_LD_WDT	0x07	/* Watchdog timer logical device */

#define SIO_UNLOCK_KEY		0x87	/* Key to enable Super-I/O */

#define SIO_LOCK_KEY		0xAA	/* Key to diasble Super-I/O */



#define SIO_REG_LDSEL		0x07	/* Logical device select */

#define SIO_REG_DEVID		0x20	/* Device ID (2 bytes) */

#define SIO_REG_DEVREV		0x22	/* Device revision */

#define SIO_REG_MANID		0x23	/* Fintek ID (2 bytes) */

#define SIO_REG_ENABLE		0x30	/* Logical device enable */

#define SIO_REG_ADDR		0x60	/* Logical device address (2 bytes) */



#define SIO_FINTEK_ID		0x1934	/* Manufacturers ID */

#define SIO_F71808_ID		0x0901  /* Chipset ID */

#define SIO_F71858_ID		0x0507  /* Chipset ID */

#define SIO_F71862_ID		0x0601	/* Chipset ID */

#define SIO_F71882_ID		0x0541	/* Chipset ID */

#define SIO_F71889_ID		0x0723	/* Chipset ID */



#define	F71882FG_REG_START		0x01



#define F71808FG_REG_WDO_CONF		0xf0

#define F71808FG_REG_WDT_CONF		0xf5

#define F71808FG_REG_WD_TIME		0xf6



#define F71808FG_FLAG_WDOUT_EN		7



#define F71808FG_FLAG_WDTMOUT_STS	5

#define F71808FG_FLAG_WD_EN		5

#define F71808FG_FLAG_WD_PULSE		4

#define F71808FG_FLAG_WD_UNIT		3



/* Default values */

#define WATCHDOG_TIMEOUT	60	/* 1 minute default timeout */

#define WATCHDOG_MAX_TIMEOUT	(60 * 255)

#define WATCHDOG_PULSE_WIDTH	125	/* 125 ms, default pulse width for

					   watchdog signal */



static unsigned short force_id;

module_param(force_id, ushort, 0);

MODULE_PARM_DESC(force_id, "Override the detected device ID");



static const int max_timeout = WATCHDOG_MAX_TIMEOUT;

static int timeout = 60;	/* default timeout in seconds */

module_param(timeout, int, 0);

MODULE_PARM_DESC(timeout,

	"Watchdog timeout in seconds. 1<= timeout <="

			__MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="

			__MODULE_STRING(WATCHDOG_TIMEOUT) ")");



static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;

module_param(pulse_width, uint, 0);

MODULE_PARM_DESC(pulse_width,

	"Watchdog signal pulse width. 0(=level), 1 ms, 25 ms, 125 ms or 5000 ms"

			" (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");



static int nowayout = WATCHDOG_NOWAYOUT;

module_param(nowayout, bool, 0444);

MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");



static unsigned int start_withtimeout;

module_param(start_withtimeout, uint, 0);

MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"

	" given initial timeout. Zero (default) disables this feature.");



enum chips { f71808fg, f71858fg, f71862fg, f71882fg, f71889fg };



static const char *f71808e_names[] = {

	"f71808fg",

	"f71858fg",

	"f71862fg",

	"f71882fg",

	"f71889fg",

};



/* Super-I/O Function prototypes */

static inline int superio_inb(int base, int reg);

static inline int superio_inw(int base, int reg);

static inline void superio_outb(int base, int reg, u8 val);

static inline void superio_set_bit(int base, int reg, int bit);

static inline void superio_clear_bit(int base, int reg, int bit);

static inline int superio_enter(int base);

static inline void superio_select(int base, int ld);

static inline void superio_exit(int base);



struct watchdog_data {

	unsigned short	sioaddr;

	enum chips	type;

	unsigned long	opened;

	struct mutex	lock;

	char		expect_close;

	struct watchdog_info ident;



	unsigned short	timeout;

	u8		timer_val;	/* content for the wd_time register */

	char		minutes_mode;

	u8		pulse_val;	/* pulse width flag */

	char		pulse_mode;	/* enable pulse output mode? */

	char		caused_reboot;	/* last reboot was by the watchdog */

};



static struct watchdog_data watchdog = {

	.lock = __MUTEX_INITIALIZER(watchdog.lock),

};



/* Super I/O functions */

static inline int superio_inb(int base, int reg)

{

	outb(reg, base);

	return inb(base + 1);

}



static int superio_inw(int base, int reg)

{

	int val;

	val  = superio_inb(base, reg) << 8;

	val |= superio_inb(base, reg + 1);

	return val;

}



static inline void superio_outb(int base, int reg, u8 val)

{

	outb(reg, base);

	outb(val, base + 1);

}



static inline void superio_set_bit(int base, int reg, int bit)

{

	unsigned long val = superio_inb(base, reg);

	__set_bit(bit, &val);

	superio_outb(base, reg, val);

}



static inline void superio_clear_bit(int base, int reg, int bit)

{

	unsigned long val = superio_inb(base, reg);

	__clear_bit(bit, &val);

	superio_outb(base, reg, val);

}



static inline int superio_enter(int base)

{

	/* Don't step on other drivers' I/O space by accident */

	if (!request_muxed_region(base, 2, DRVNAME)) {

		printk(KERN_ERR DRVNAME ": I/O address 0x%04x already in use\n",

				(int)base);

		return -EBUSY;

	}



	/* according to the datasheet the key must be send twice! */

	outb(SIO_UNLOCK_KEY, base);

	outb(SIO_UNLOCK_KEY, base);



	return 0;

}



static inline void superio_select(int base, int ld)

{

	outb(SIO_REG_LDSEL, base);

	outb(ld, base + 1);

}



static inline void superio_exit(int base)

{

	outb(SIO_LOCK_KEY, base);

	release_region(base, 2);

}



static int watchdog_set_timeout(int timeout)

{

	if (timeout <= 0

	 || timeout >  max_timeout) {

		printk(KERN_ERR DRVNAME ": watchdog timeout out of range\n");

		return -EINVAL;

	}



	mutex_lock(&watchdog.lock);



	watchdog.timeout = timeout;

	if (timeout > 0xff) {

		watchdog.timer_val = DIV_ROUND_UP(timeout, 60);

		watchdog.minutes_mode = true;

	} else {

		watchdog.timer_val = timeout;

		watchdog.minutes_mode = false;

	}



	mutex_unlock(&watchdog.lock);



	return 0;

}



static int watchdog_set_pulse_width(unsigned int pw)

{

	int err = 0;



	mutex_lock(&watchdog.lock);



	if        (pw <=    1) {

		watchdog.pulse_val = 0;

	} else if (pw <=   25) {

		watchdog.pulse_val = 1;

	} else if (pw <=  125) {

		watchdog.pulse_val = 2;

	} else if (pw <= 5000) {

		watchdog.pulse_val = 3;

	} else {

		printk(KERN_ERR DRVNAME ": pulse width out of range\n");

		err = -EINVAL;

		goto exit_unlock;

	}



	watchdog.pulse_mode = pw;



exit_unlock:

	mutex_unlock(&watchdog.lock);

	return err;

}



static int watchdog_keepalive(void)

{

	int err = 0;



	mutex_lock(&watchdog.lock);

	err = superio_enter(watchdog.sioaddr);

	if (err)

		goto exit_unlock;

	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);



	if (watchdog.minutes_mode)

		/* select minutes for timer units */

		superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,

				F71808FG_FLAG_WD_UNIT);

	else

		/* select seconds for timer units */

		superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,

				F71808FG_FLAG_WD_UNIT);



	/* Set timer value */

	superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,

			   watchdog.timer_val);



	superio_exit(watchdog.sioaddr);



exit_unlock:

	mutex_unlock(&watchdog.lock);

	return err;

}



static int watchdog_start(void)

{

	/* Make sure we don't die as soon as the watchdog is enabled below */

	int err = watchdog_keepalive();

	if (err)

		return err;



	mutex_lock(&watchdog.lock);

	err = superio_enter(watchdog.sioaddr);

	if (err)

		goto exit_unlock;

	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);



	/* Watchdog pin configuration */

	switch (watchdog.type) {

	case f71808fg:

		/* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */

		superio_clear_bit(watchdog.sioaddr, 0x2a, 3);

		superio_clear_bit(watchdog.sioaddr, 0x2b, 3);

		break;



	case f71882fg:

		/* Set pin 56 to WDTRST# */

		superio_set_bit(watchdog.sioaddr, 0x29, 1);

		break;



	default:

		/*

		 * 'default' label to shut up the compiler and catch

		 * programmer errors

		 */

		err = -ENODEV;

		goto exit_superio;

	}



	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);

	superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);

	superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,

			F71808FG_FLAG_WDOUT_EN);



	superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,

			F71808FG_FLAG_WD_EN);



	if (watchdog.pulse_mode) {

		/* Select "pulse" output mode with given duration */

		u8 wdt_conf = superio_inb(watchdog.sioaddr,

				F71808FG_REG_WDT_CONF);



		/* Set WD_PSWIDTH bits (1:0) */

		wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);

		/* Set WD_PULSE to "pulse" mode */

		wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);



		superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,

				wdt_conf);

	} else {

		/* Select "level" output mode */

		superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,

				F71808FG_FLAG_WD_PULSE);

	}



exit_superio:

	superio_exit(watchdog.sioaddr);

exit_unlock:

	mutex_unlock(&watchdog.lock);



	return err;

}



static int watchdog_stop(void)

{

	int err = 0;



	mutex_lock(&watchdog.lock);

	err = superio_enter(watchdog.sioaddr);

	if (err)

		goto exit_unlock;

	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);



	superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,

			F71808FG_FLAG_WD_EN);



	superio_exit(watchdog.sioaddr);



exit_unlock:

	mutex_unlock(&watchdog.lock);



	return err;

}



static int watchdog_get_status(void)

{

	int status = 0;



	mutex_lock(&watchdog.lock);

	status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;

	mutex_unlock(&watchdog.lock);



	return status;

}



static bool watchdog_is_running(void)

{

	/*

	 * if we fail to determine the watchdog's status assume it to be

	 * running to be on the safe side

	 */

	bool is_running = true;



	mutex_lock(&watchdog.lock);

	if (superio_enter(watchdog.sioaddr))

		goto exit_unlock;

	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);



	is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))

		&& (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)

			& F71808FG_FLAG_WD_EN);



	superio_exit(watchdog.sioaddr);



exit_unlock:

	mutex_unlock(&watchdog.lock);

	return is_running;

}



/* /dev/watchdog api */



static int watchdog_open(struct inode *inode, struct file *file)

{

	int err;



	/* If the watchdog is alive we don't need to start it again */

	if (test_and_set_bit(0, &watchdog.opened))

		return -EBUSY;



	err = watchdog_start();

	if (err) {

		clear_bit(0, &watchdog.opened);

		return err;

	}



	if (nowayout)

		__module_get(THIS_MODULE);



	watchdog.expect_close = 0;

	return nonseekable_open(inode, file);

}



static int watchdog_release(struct inode *inode, struct file *file)

{

	clear_bit(0, &watchdog.opened);



	if (!watchdog.expect_close) {

		watchdog_keepalive();

		printk(KERN_CRIT DRVNAME

			": Unexpected close, not stopping watchdog!\n");

	} else if (!nowayout) {

		watchdog_stop();

	}

	return 0;

}



/*

 *      watchdog_write:

 *      @file: file handle to the watchdog

 *      @buf: buffer to write

 *      @count: count of 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 watchdog_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 */

			bool expect_close = false;



			for (i = 0; i != count; i++) {

				char c;

				if (get_user(c, buf + i))

					return -EFAULT;

				expect_close = (c == 'V');

			}



			/* Properly order writes across fork()ed processes */

			mutex_lock(&watchdog.lock);

			watchdog.expect_close = expect_close;

			mutex_unlock(&watchdog.lock);

		}



		/* someone wrote to us, we should restart timer */

		watchdog_keepalive();

	}

	return count;

}



/*

 *      watchdog_ioctl:

 *      @inode: inode of the device

 *      @file: file handle to the device

 *      @cmd: watchdog command

 *      @arg: argument pointer

 *

 *      The watchdog API defines a common set of functions for all watchdogs

 *      according to their available features.

 */

static long watchdog_ioctl(struct file *file, unsigned int cmd,

	unsigned long arg)

{

	int status;

	int new_options;

	int new_timeout;

	union {

		struct watchdog_info __user *ident;

		int __user *i;

	} uarg;



	uarg.i = (int __user *)arg;



	switch (cmd) {

	case WDIOC_GETSUPPORT:

		return copy_to_user(uarg.ident, &watchdog.ident,

			sizeof(watchdog.ident)) ? -EFAULT : 0;



	case WDIOC_GETSTATUS:

		status = watchdog_get_status();

		if (status < 0)

			return status;

		return put_user(status, uarg.i);



	case WDIOC_GETBOOTSTATUS:

		return put_user(0, uarg.i);



	case WDIOC_SETOPTIONS:

		if (get_user(new_options, uarg.i))

			return -EFAULT;



		if (new_options & WDIOS_DISABLECARD)

			watchdog_stop();



		if (new_options & WDIOS_ENABLECARD)

			return watchdog_start();





	case WDIOC_KEEPALIVE:

		watchdog_keepalive();

		return 0;



	case WDIOC_SETTIMEOUT:

		if (get_user(new_timeout, uarg.i))

			return -EFAULT;



		if (watchdog_set_timeout(new_timeout))

			return -EINVAL;



		watchdog_keepalive();

		/* Fall */



	case WDIOC_GETTIMEOUT:

		return put_user(watchdog.timeout, uarg.i);



	default:

		return -ENOTTY;



	}

}



static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,

	void *unused)

{

	if (code == SYS_DOWN || code == SYS_HALT)

		watchdog_stop();

	return NOTIFY_DONE;

}



static const struct file_operations watchdog_fops = {

	.owner		= THIS_MODULE,

	.llseek		= no_llseek,

	.open		= watchdog_open,

	.release	= watchdog_release,

	.write		= watchdog_write,

	.unlocked_ioctl	= watchdog_ioctl,

};



static struct miscdevice watchdog_miscdev = {

	.minor		= WATCHDOG_MINOR,

	.name		= "watchdog",

	.fops		= &watchdog_fops,

};



static struct notifier_block watchdog_notifier = {

	.notifier_call = watchdog_notify_sys,

};



static int __init watchdog_init(int sioaddr)

{

	int wdt_conf, err = 0;



	/* No need to lock watchdog.lock here because no entry points

	 * into the module have been registered yet.

	 */

	watchdog.sioaddr = sioaddr;

	watchdog.ident.options = WDIOC_SETTIMEOUT

				| WDIOF_MAGICCLOSE

				| WDIOF_KEEPALIVEPING;



	snprintf(watchdog.ident.identity,

		sizeof(watchdog.ident.identity), "%s watchdog",

		f71808e_names[watchdog.type]);



	err = superio_enter(sioaddr);

	if (err)

		return err;

	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);



	wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);

	watchdog.caused_reboot = wdt_conf & F71808FG_FLAG_WDTMOUT_STS;



	superio_exit(sioaddr);



	err = watchdog_set_timeout(timeout);

	if (err)

		return err;

	err = watchdog_set_pulse_width(pulse_width);

	if (err)

		return err;



	err = register_reboot_notifier(&watchdog_notifier);

	if (err)

		return err;



	err = misc_register(&watchdog_miscdev);

	if (err) {

		printk(KERN_ERR DRVNAME

			": cannot register miscdev on minor=%d\n",

				watchdog_miscdev.minor);

		goto exit_reboot;

	}



	if (start_withtimeout) {

		if (start_withtimeout <= 0

		 || start_withtimeout >  max_timeout) {

			printk(KERN_ERR DRVNAME

				": starting timeout out of range\n");

			err = -EINVAL;

			goto exit_miscdev;

		}



		err = watchdog_start();

		if (err) {

			printk(KERN_ERR DRVNAME

				": cannot start watchdog timer\n");

			goto exit_miscdev;

		}



		mutex_lock(&watchdog.lock);

		err = superio_enter(sioaddr);

		if (err)

			goto exit_unlock;

		superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);



		if (start_withtimeout > 0xff) {

			/* select minutes for timer units */

			superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,

				F71808FG_FLAG_WD_UNIT);

			superio_outb(sioaddr, F71808FG_REG_WD_TIME,

				DIV_ROUND_UP(start_withtimeout, 60));

		} else {

			/* select seconds for timer units */

			superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,

				F71808FG_FLAG_WD_UNIT);

			superio_outb(sioaddr, F71808FG_REG_WD_TIME,

				start_withtimeout);

		}



		superio_exit(sioaddr);

		mutex_unlock(&watchdog.lock);



		if (nowayout)

			__module_get(THIS_MODULE);



		printk(KERN_INFO DRVNAME

			": watchdog started with initial timeout of %u sec\n",

			start_withtimeout);

	}



	return 0;



exit_unlock:

	mutex_unlock(&watchdog.lock);

exit_miscdev:

	misc_deregister(&watchdog_miscdev);

exit_reboot:

	unregister_reboot_notifier(&watchdog_notifier);



	return err;

}



static int __init f71808e_find(int sioaddr)

{

	u16 devid;

	int err = superio_enter(sioaddr);

	if (err)

		return err;



	devid = superio_inw(sioaddr, SIO_REG_MANID);

	if (devid != SIO_FINTEK_ID) {

		pr_debug(DRVNAME ": Not a Fintek device\n");

		err = -ENODEV;

		goto exit;

	}



	devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);

	switch (devid) {

	case SIO_F71808_ID:

		watchdog.type = f71808fg;

		break;

	case SIO_F71882_ID:

		watchdog.type = f71882fg;

		break;

	case SIO_F71862_ID:

	case SIO_F71889_ID:

		/* These have a watchdog, though it isn't implemented (yet). */

		err = -ENOSYS;

		goto exit;

	case SIO_F71858_ID:

		/* Confirmed (by datasheet) not to have a watchdog. */

		err = -ENODEV;

		goto exit;

	default:

		printk(KERN_INFO DRVNAME ": Unrecognized Fintek device: %04x\n",

		       (unsigned int)devid);

		err = -ENODEV;

		goto exit;

	}



	printk(KERN_INFO DRVNAME ": Found %s watchdog chip, revision %d\n",

		f71808e_names[watchdog.type],

		(int)superio_inb(sioaddr, SIO_REG_DEVREV));

exit:

	superio_exit(sioaddr);

	return err;

}



static int __init f71808e_init(void)

{

	static const unsigned short addrs[] = { 0x2e, 0x4e };

	int err = -ENODEV;

	int i;



	for (i = 0; i < ARRAY_SIZE(addrs); i++) {

		err = f71808e_find(addrs[i]);

		if (err == 0)

			break;

	}

	if (i == ARRAY_SIZE(addrs))

		return err;



	return watchdog_init(addrs[i]);

}



static void __exit f71808e_exit(void)

{

	if (watchdog_is_running()) {

		printk(KERN_WARNING DRVNAME

			": Watchdog timer still running, stopping it\n");

		watchdog_stop();

	}

	misc_deregister(&watchdog_miscdev);

	unregister_reboot_notifier(&watchdog_notifier);

}



MODULE_DESCRIPTION("F71808E Watchdog Driver");

MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");

MODULE_LICENSE("GPL");



module_init(f71808e_init);

module_exit(f71808e_exit);