watchdog: Remove drivers for W83697HF and W83697UG (7285fae9) · Commits · 戴 / test

drivers/watchdog/Kconfig

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Original line number	Original line	Diff line number	Diff line
	@@ -940,36 +940,6 @@ config W83627HF_WDT

	Most people will say N.		Most people will say N.

	config W83697HF_WDT
	tristate "W83697HF/W83697HG Watchdog Timer"
	depends on X86
	---help---
	This is the driver for the hardware watchdog on the W83697HF/HG
	chipset as used in Dedibox/VIA motherboards (and likely others).
	This watchdog simply watches your kernel to make sure it doesn't
	freeze, and if it does, it reboots your computer after a certain
	amount of time.

	To compile this driver as a module, choose M here: the
	module will be called w83697hf_wdt.

	Most people will say N.

	config W83697UG_WDT
	tristate "W83697UG/W83697UF Watchdog Timer"
	depends on X86
	---help---
	This is the driver for the hardware watchdog on the W83697UG/UF
	chipset as used in MSI Fuzzy CX700 VIA motherboards (and likely others).
	This watchdog simply watches your kernel to make sure it doesn't
	freeze, and if it does, it reboots your computer after a certain
	amount of time.

	To compile this driver as a module, choose M here: the
	module will be called w83697ug_wdt.

	Most people will say N.

	config W83877F_WDT		config W83877F_WDT
	tristate "W83877F (EMACS) Watchdog Timer"		tristate "W83877F (EMACS) Watchdog Timer"
	depends on X86		depends on X86

drivers/watchdog/Makefile

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Original line number	Original line	Diff line number	Diff line
	@@ -107,8 +107,6 @@ obj-$(CONFIG_SMSC_SCH311X_WDT) += sch311x_wdt.o
	obj-$(CONFIG_SMSC37B787_WDT) += smsc37b787_wdt.o		obj-$(CONFIG_SMSC37B787_WDT) += smsc37b787_wdt.o
	obj-$(CONFIG_VIA_WDT) += via_wdt.o		obj-$(CONFIG_VIA_WDT) += via_wdt.o
	obj-$(CONFIG_W83627HF_WDT) += w83627hf_wdt.o		obj-$(CONFIG_W83627HF_WDT) += w83627hf_wdt.o
	obj-$(CONFIG_W83697HF_WDT) += w83697hf_wdt.o
	obj-$(CONFIG_W83697UG_WDT) += w83697ug_wdt.o
	obj-$(CONFIG_W83877F_WDT) += w83877f_wdt.o		obj-$(CONFIG_W83877F_WDT) += w83877f_wdt.o
	obj-$(CONFIG_W83977F_WDT) += w83977f_wdt.o		obj-$(CONFIG_W83977F_WDT) += w83977f_wdt.o
	obj-$(CONFIG_MACHZ_WDT) += machzwd.o		obj-$(CONFIG_MACHZ_WDT) += machzwd.o

drivers/watchdog/w83697hf_wdt.c

deleted100644 → 0

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Original line number	Original line	Diff line number	Diff line
	/*
	* w83697hf/hg WDT driver
	*
	* (c) Copyright 2006 Samuel Tardieu <sam@rfc1149.net>
	* (c) Copyright 2006 Marcus Junker <junker@anduras.de>
	*
	* Based on w83627hf_wdt.c which is based on advantechwdt.c
	* which is based on wdt.c.
	* Original copyright messages:
	*
	* (c) Copyright 2003 Pádraig Brady <P@draigBrady.com>
	*
	* (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
	*
	* (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 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.
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/types.h>
	#include <linux/miscdevice.h>
	#include <linux/watchdog.h>
	#include <linux/fs.h>
	#include <linux/ioport.h>
	#include <linux/notifier.h>
	#include <linux/reboot.h>
	#include <linux/init.h>
	#include <linux/spinlock.h>
	#include <linux/io.h>
	#include <linux/uaccess.h>


	#define WATCHDOG_NAME "w83697hf/hg WDT"
	#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
	#define WATCHDOG_EARLY_DISABLE 1 /* Disable until userland kicks in */

	static unsigned long wdt_is_open;
	static char expect_close;
	static DEFINE_SPINLOCK(io_lock);

	/* You must set this - there is no sane way to probe for this board. */
	static int wdt_io = 0x2e;
	module_param(wdt_io, int, 0);
	MODULE_PARM_DESC(wdt_io,
	"w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)");

	static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
	module_param(timeout, int, 0);
	MODULE_PARM_DESC(timeout,
	"Watchdog timeout in seconds. 1<= timeout <=255 (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) ")");

	static int early_disable = WATCHDOG_EARLY_DISABLE;
	module_param(early_disable, int, 0);
	MODULE_PARM_DESC(early_disable,
	"Watchdog gets disabled at boot time (default="
	__MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")");

	/*
	* Kernel methods.
	*/

	#define W83697HF_EFER (wdt_io + 0) /* Extended Function Enable Register */
	#define W83697HF_EFIR (wdt_io + 0) /* Extended Function Index Register
	(same as EFER) */
	#define W83697HF_EFDR (wdt_io + 1) /* Extended Function Data Register */

	static inline void w83697hf_unlock(void)
	{
	outb_p(0x87, W83697HF_EFER); /* Enter extended function mode */
	outb_p(0x87, W83697HF_EFER); /* Again according to manual */
	}

	static inline void w83697hf_lock(void)
	{
	outb_p(0xAA, W83697HF_EFER); /* Leave extended function mode */
	}

	/*
	* The three functions w83697hf_get_reg(), w83697hf_set_reg() and
	* w83697hf_write_timeout() must be called with the device unlocked.
	*/

	static unsigned char w83697hf_get_reg(unsigned char reg)
	{
	outb_p(reg, W83697HF_EFIR);
	return inb_p(W83697HF_EFDR);
	}

	static void w83697hf_set_reg(unsigned char reg, unsigned char data)
	{
	outb_p(reg, W83697HF_EFIR);
	outb_p(data, W83697HF_EFDR);
	}

	static void w83697hf_write_timeout(int timeout)
	{
	/* Write Timeout counter to CRF4 */
	w83697hf_set_reg(0xF4, timeout);
	}

	static void w83697hf_select_wdt(void)
	{
	w83697hf_unlock();
	w83697hf_set_reg(0x07, 0x08); /* Switch to logic device 8 (GPIO2) */
	}

	static inline void w83697hf_deselect_wdt(void)
	{
	w83697hf_lock();
	}

	static void w83697hf_init(void)
	{
	unsigned char bbuf;

	w83697hf_select_wdt();

	bbuf = w83697hf_get_reg(0x29);
	bbuf &= ~0x60;
	bbuf \|= 0x20;

	/* Set pin 119 to WDTO# mode (= CR29, WDT0) */
	w83697hf_set_reg(0x29, bbuf);

	bbuf = w83697hf_get_reg(0xF3);
	bbuf &= ~0x04;
	w83697hf_set_reg(0xF3, bbuf); /* Count mode is seconds */

	w83697hf_deselect_wdt();
	}

	static void wdt_ping(void)
	{
	spin_lock(&io_lock);
	w83697hf_select_wdt();

	w83697hf_write_timeout(timeout);

	w83697hf_deselect_wdt();
	spin_unlock(&io_lock);
	}

	static void wdt_enable(void)
	{
	spin_lock(&io_lock);
	w83697hf_select_wdt();

	w83697hf_write_timeout(timeout);
	w83697hf_set_reg(0x30, 1); /* Enable timer */

	w83697hf_deselect_wdt();
	spin_unlock(&io_lock);
	}

	static void wdt_disable(void)
	{
	spin_lock(&io_lock);
	w83697hf_select_wdt();

	w83697hf_set_reg(0x30, 0); /* Disable timer */
	w83697hf_write_timeout(0);

	w83697hf_deselect_wdt();
	spin_unlock(&io_lock);
	}

	static unsigned char wdt_running(void)
	{
	unsigned char t;

	spin_lock(&io_lock);
	w83697hf_select_wdt();

	t = w83697hf_get_reg(0xF4); /* Read timer */

	w83697hf_deselect_wdt();
	spin_unlock(&io_lock);

	return t;
	}

	static int wdt_set_heartbeat(int t)
	{
	if (t < 1 \|\| t > 255)
	return -EINVAL;

	timeout = t;
	return 0;
	}

	static ssize_t wdt_write(struct file file, const char __user buf,
	size_t count, loff_t *ppos)
	{
	if (count) {
	if (!nowayout) {
	size_t i;

	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;
	}
	}
	wdt_ping();
	}
	return count;
	}

	static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	{
	void __user argp = (void __user )arg;
	int __user *p = argp;
	int new_timeout;
	static const struct watchdog_info ident = {
	.options = WDIOF_KEEPALIVEPING \| WDIOF_SETTIMEOUT
	\| WDIOF_MAGICCLOSE,
	.firmware_version = 1,
	.identity = "W83697HF 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) {
	wdt_disable();
	retval = 0;
	}

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

	return retval;
	}

	case WDIOC_KEEPALIVE:
	wdt_ping();
	break;

	case WDIOC_SETTIMEOUT:
	if (get_user(new_timeout, p))
	return -EFAULT;
	if (wdt_set_heartbeat(new_timeout))
	return -EINVAL;
	wdt_ping();
	/* Fall */

	case WDIOC_GETTIMEOUT:
	return put_user(timeout, p);

	default:
	return -ENOTTY;
	}
	return 0;
	}

	static int wdt_open(struct inode inode, struct file file)
	{
	if (test_and_set_bit(0, &wdt_is_open))
	return -EBUSY;
	/*
	* Activate
	*/

	wdt_enable();
	return nonseekable_open(inode, file);
	}

	static int wdt_close(struct inode inode, struct file file)
	{
	if (expect_close == 42)
	wdt_disable();
	else {
	pr_crit("Unexpected close, not stopping watchdog!\n");
	wdt_ping();
	}
	expect_close = 0;
	clear_bit(0, &wdt_is_open);
	return 0;
	}

	/*
	* Notifier for system down
	*/

	static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
	void *unused)
	{
	if (code == SYS_DOWN \|\| code == SYS_HALT)
	wdt_disable(); /* Turn the WDT off */

	return NOTIFY_DONE;
	}

	/*
	* Kernel Interfaces
	*/

	static const struct file_operations wdt_fops = {
	.owner = THIS_MODULE,
	.llseek = no_llseek,
	.write = wdt_write,
	.unlocked_ioctl = wdt_ioctl,
	.open = wdt_open,
	.release = wdt_close,
	};

	static struct miscdevice wdt_miscdev = {
	.minor = WATCHDOG_MINOR,
	.name = "watchdog",
	.fops = &wdt_fops,
	};

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

	static struct notifier_block wdt_notifier = {
	.notifier_call = wdt_notify_sys,
	};

	static int w83697hf_check_wdt(void)
	{
	if (!request_region(wdt_io, 2, WATCHDOG_NAME)) {
	pr_err("I/O address 0x%x already in use\n", wdt_io);
	return -EIO;
	}

	pr_debug("Looking for watchdog at address 0x%x\n", wdt_io);
	w83697hf_unlock();
	if (w83697hf_get_reg(0x20) == 0x60) {
	pr_info("watchdog found at address 0x%x\n", wdt_io);
	w83697hf_lock();
	return 0;
	}
	/* Reprotect in case it was a compatible device */
	w83697hf_lock();

	pr_info("watchdog not found at address 0x%x\n", wdt_io);
	release_region(wdt_io, 2);
	return -EIO;
	}

	static int w83697hf_ioports[] = { 0x2e, 0x4e, 0x00 };

	static int __init wdt_init(void)
	{
	int ret, i, found = 0;

	pr_info("WDT driver for W83697HF/HG initializing\n");

	if (wdt_io == 0) {
	/* we will autodetect the W83697HF/HG watchdog */
	for (i = 0; ((!found) && (w83697hf_ioports[i] != 0)); i++) {
	wdt_io = w83697hf_ioports[i];
	if (!w83697hf_check_wdt())
	found++;
	}
	} else {
	if (!w83697hf_check_wdt())
	found++;
	}

	if (!found) {
	pr_err("No W83697HF/HG could be found\n");
	ret = -ENODEV;
	goto out;
	}

	w83697hf_init();
	if (early_disable) {
	if (wdt_running())
	pr_warn("Stopping previously enabled watchdog until userland kicks in\n");
	wdt_disable();
	}

	if (wdt_set_heartbeat(timeout)) {
	wdt_set_heartbeat(WATCHDOG_TIMEOUT);
	pr_info("timeout value must be 1 <= timeout <= 255, using %d\n",
	WATCHDOG_TIMEOUT);
	}

	ret = register_reboot_notifier(&wdt_notifier);
	if (ret != 0) {
	pr_err("cannot register reboot notifier (err=%d)\n", ret);
	goto unreg_regions;
	}

	ret = misc_register(&wdt_miscdev);
	if (ret != 0) {
	pr_err("cannot register miscdev on minor=%d (err=%d)\n",
	WATCHDOG_MINOR, ret);
	goto unreg_reboot;
	}

	pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
	timeout, nowayout);

	out:
	return ret;
	unreg_reboot:
	unregister_reboot_notifier(&wdt_notifier);
	unreg_regions:
	release_region(wdt_io, 2);
	goto out;
	}

	static void __exit wdt_exit(void)
	{
	misc_deregister(&wdt_miscdev);
	unregister_reboot_notifier(&wdt_notifier);
	release_region(wdt_io, 2);
	}

	module_init(wdt_init);
	module_exit(wdt_exit);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Marcus Junker <junker@anduras.de>");
	MODULE_AUTHOR("Samuel Tardieu <sam@rfc1149.net>");
	MODULE_DESCRIPTION("w83697hf/hg WDT driver");

drivers/watchdog/w83697ug_wdt.c

deleted100644 → 0

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Original line number	Original line	Diff line number	Diff line
	/*
	* w83697ug/uf WDT driver
	*
	* (c) Copyright 2008 Flemming Fransen <ff@nrvissing.net>
	* reused original code to support w83697ug/uf.
	*
	* Based on w83627hf_wdt.c which is based on advantechwdt.c
	* which is based on wdt.c.
	* Original copyright messages:
	*
	* (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com>
	* added support for W83627THF.
	*
	* (c) Copyright 2003 Pádraig Brady <P@draigBrady.com>
	*
	* (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
	*
	* (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>
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/types.h>
	#include <linux/miscdevice.h>
	#include <linux/watchdog.h>
	#include <linux/fs.h>
	#include <linux/ioport.h>
	#include <linux/notifier.h>
	#include <linux/reboot.h>
	#include <linux/init.h>
	#include <linux/spinlock.h>
	#include <linux/io.h>
	#include <linux/uaccess.h>


	#define WATCHDOG_NAME "w83697ug/uf WDT"
	#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */

	static unsigned long wdt_is_open;
	static char expect_close;
	static DEFINE_SPINLOCK(io_lock);

	static int wdt_io = 0x2e;
	module_param(wdt_io, int, 0);
	MODULE_PARM_DESC(wdt_io, "w83697ug/uf WDT io port (default 0x2e)");

	static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
	module_param(timeout, int, 0);
	MODULE_PARM_DESC(timeout,
	"Watchdog timeout in seconds. 1<= timeout <=255 (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) ")");

	/*
	* Kernel methods.
	*/

	#define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */
	#define WDT_EFIR (wdt_io+0) /* Extended Function Index Register
	(same as EFER) */
	#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */

	static int w83697ug_select_wd_register(void)
	{
	unsigned char c;
	unsigned char version;

	outb_p(0x87, WDT_EFER); /* Enter extended function mode */
	outb_p(0x87, WDT_EFER); /* Again according to manual */

	outb(0x20, WDT_EFER); /* check chip version */
	version = inb(WDT_EFDR);

	if (version == 0x68) { /* W83697UG */
	pr_info("Watchdog chip version 0x%02x = W83697UG/UF found at 0x%04x\n",
	version, wdt_io);

	outb_p(0x2b, WDT_EFER);
	c = inb_p(WDT_EFDR); /* select WDT0 */
	c &= ~0x04;
	outb_p(0x2b, WDT_EFER);
	outb_p(c, WDT_EFDR); /* set pin118 to WDT0 */

	} else {
	pr_err("No W83697UG/UF could be found\n");
	return -ENODEV;
	}

	outb_p(0x07, WDT_EFER); /* point to logical device number reg */
	outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */
	outb_p(0x30, WDT_EFER); /* select CR30 */
	c = inb_p(WDT_EFDR);
	outb_p(c \| 0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */

	return 0;
	}

	static void w83697ug_unselect_wd_register(void)
	{
	outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
	}

	static int w83697ug_init(void)
	{
	int ret;
	unsigned char t;

	ret = w83697ug_select_wd_register();
	if (ret != 0)
	return ret;

	outb_p(0xF6, WDT_EFER); /* Select CRF6 */
	t = inb_p(WDT_EFDR); /* read CRF6 */
	if (t != 0) {
	pr_info("Watchdog already running. Resetting timeout to %d sec\n",
	timeout);
	outb_p(timeout, WDT_EFDR); /* Write back to CRF6 */
	}
	outb_p(0xF5, WDT_EFER); /* Select CRF5 */
	t = inb_p(WDT_EFDR); /* read CRF5 */
	t &= ~0x0C; /* set second mode &
	disable keyboard turning off watchdog */
	outb_p(t, WDT_EFDR); /* Write back to CRF5 */

	w83697ug_unselect_wd_register();
	return 0;
	}

	static void wdt_ctrl(int timeout)
	{
	spin_lock(&io_lock);

	if (w83697ug_select_wd_register() < 0) {
	spin_unlock(&io_lock);
	return;
	}

	outb_p(0xF4, WDT_EFER); /* Select CRF4 */
	outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF4 */

	w83697ug_unselect_wd_register();

	spin_unlock(&io_lock);
	}

	static int wdt_ping(void)
	{
	wdt_ctrl(timeout);
	return 0;
	}

	static int wdt_disable(void)
	{
	wdt_ctrl(0);
	return 0;
	}

	static int wdt_set_heartbeat(int t)
	{
	if (t < 1 \|\| t > 255)
	return -EINVAL;

	timeout = t;
	return 0;
	}

	static ssize_t wdt_write(struct file file, const char __user buf,
	size_t count, loff_t *ppos)
	{
	if (count) {
	if (!nowayout) {
	size_t i;

	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;
	}
	}
	wdt_ping();
	}
	return count;
	}

	static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	{
	void __user argp = (void __user )arg;
	int __user *p = argp;
	int new_timeout;
	static const struct watchdog_info ident = {
	.options = WDIOF_KEEPALIVEPING \|
	WDIOF_SETTIMEOUT \|
	WDIOF_MAGICCLOSE,
	.firmware_version = 1,
	.identity = "W83697UG 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) {
	wdt_disable();
	retval = 0;
	}

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

	return retval;
	}

	case WDIOC_KEEPALIVE:
	wdt_ping();
	break;

	case WDIOC_SETTIMEOUT:
	if (get_user(new_timeout, p))
	return -EFAULT;
	if (wdt_set_heartbeat(new_timeout))
	return -EINVAL;
	wdt_ping();
	/* Fall */

	case WDIOC_GETTIMEOUT:
	return put_user(timeout, p);

	default:
	return -ENOTTY;
	}
	return 0;
	}

	static int wdt_open(struct inode inode, struct file file)
	{
	if (test_and_set_bit(0, &wdt_is_open))
	return -EBUSY;
	/*
	* Activate
	*/

	wdt_ping();
	return nonseekable_open(inode, file);
	}

	static int wdt_close(struct inode inode, struct file file)
	{
	if (expect_close == 42)
	wdt_disable();
	else {
	pr_crit("Unexpected close, not stopping watchdog!\n");
	wdt_ping();
	}
	expect_close = 0;
	clear_bit(0, &wdt_is_open);
	return 0;
	}

	/*
	* Notifier for system down
	*/

	static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
	void *unused)
	{
	if (code == SYS_DOWN \|\| code == SYS_HALT)
	wdt_disable(); /* Turn the WDT off */

	return NOTIFY_DONE;
	}

	/*
	* Kernel Interfaces
	*/

	static const struct file_operations wdt_fops = {
	.owner = THIS_MODULE,
	.llseek = no_llseek,
	.write = wdt_write,
	.unlocked_ioctl = wdt_ioctl,
	.open = wdt_open,
	.release = wdt_close,
	};

	static struct miscdevice wdt_miscdev = {
	.minor = WATCHDOG_MINOR,
	.name = "watchdog",
	.fops = &wdt_fops,
	};

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

	static struct notifier_block wdt_notifier = {
	.notifier_call = wdt_notify_sys,
	};

	static int __init wdt_init(void)
	{
	int ret;

	pr_info("WDT driver for the Winbond(TM) W83697UG/UF Super I/O chip initialising\n");

	if (wdt_set_heartbeat(timeout)) {
	wdt_set_heartbeat(WATCHDOG_TIMEOUT);
	pr_info("timeout value must be 1<=timeout<=255, using %d\n",
	WATCHDOG_TIMEOUT);
	}

	if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
	pr_err("I/O address 0x%04x already in use\n", wdt_io);
	ret = -EIO;
	goto out;
	}

	ret = w83697ug_init();
	if (ret != 0)
	goto unreg_regions;

	ret = register_reboot_notifier(&wdt_notifier);
	if (ret != 0) {
	pr_err("cannot register reboot notifier (err=%d)\n", ret);
	goto unreg_regions;
	}

	ret = misc_register(&wdt_miscdev);
	if (ret != 0) {
	pr_err("cannot register miscdev on minor=%d (err=%d)\n",
	WATCHDOG_MINOR, ret);
	goto unreg_reboot;
	}

	pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
	timeout, nowayout);

	out:
	return ret;
	unreg_reboot:
	unregister_reboot_notifier(&wdt_notifier);
	unreg_regions:
	release_region(wdt_io, 1);
	goto out;
	}

	static void __exit wdt_exit(void)
	{
	misc_deregister(&wdt_miscdev);
	unregister_reboot_notifier(&wdt_notifier);
	release_region(wdt_io, 1);
	}

	module_init(wdt_init);
	module_exit(wdt_exit);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Flemming Frandsen <ff@nrvissing.net>");
	MODULE_DESCRIPTION("w83697ug/uf WDT driver");

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