Merge bk://linux-dj.bkbits.net/watchdog

into home.transmeta.com:/home/torvalds/v2.5/linux

drivers/char/watchdog/Kconfig

@@ -283,4 +283,24 @@ config MACHZ_WDT
 	  The module is called machzwd.o.  If you want to compile it as a
 	  module, say M here and read <file:Documentation/modules.txt>.
 
+config W83877F_WDT
+	tristate "W83877F Computer Watchdog"
+	depends on WATCHDOG
+
+config SC520_WDT
+	tristate "AMD Elan SC520 processor Watchdog"
+	depends on WATCHDOG
+
+config ALIM7101_WDT
+	tristate "ALi M7101 PMU Computer Watchdog"
+	depends on WATCHDOG
+
+config SC1200_WDT
+	tristate "National Semiconductor PC87307/PC97307 (ala SC1200) Watchdog"
+	depends on WATCHDOG
+
+config WAFER_WDT
+	tristate "ICP Wafer 5823 Single Board Computer Watchdog"
+	depends on WATCHDOG
+
 endmenu

drivers/char/watchdog/Makefile

@@ -23,3 +23,8 @@ obj-$(CONFIG_MACHZ_WDT) += machzwd.o
 obj-$(CONFIG_SH_WDT) += shwdt.o
 obj-$(CONFIG_EUROTECH_WDT) += eurotechwdt.o
 obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
+obj-$(CONFIG_W83877F_WDT) += w83877f_wdt.o
+obj-$(CONFIG_SC520_WDT) += sc520_wdt.o
+obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o
+obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
+obj-$(CONFIG_WAFER_WDT) += wafer5823wdt.o

drivers/char/watchdog/acquirewdt.c

@@ -45,6 +45,7 @@
 
 static int acq_is_open;
 static spinlock_t acq_lock;
+static int expect_close = 0;
 
 /*
  *	You must set these - there is no sane way to probe for this board.
@@ -79,8 +80,20 @@ static ssize_t acq_write(struct file *file, const char *buf, size_t count, loff_
 	if (ppos != &file->f_pos)
 		return -ESPIPE;
 
-	if(count)
-	{
+	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 = 1;
+			}
+		}
 		acq_ping();
 		return 1;
 	}
@@ -97,9 +110,11 @@ static ssize_t acq_read(struct file *file, char *buf, size_t count, loff_t *ppos
 static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 	unsigned long arg)
 {
-	static struct watchdog_info ident=
+	static struct watchdog_info ident =
 	{
-		WDIOF_KEEPALIVEPING, 1, "Acquire WDT"
+		.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "Acquire WDT"
 	};
 	
 	switch(cmd)
@@ -126,39 +141,35 @@ static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 
 static int acq_open(struct inode *inode, struct file *file)
 {
-	switch(minor(inode->i_rdev))
-	{
-		case WATCHDOG_MINOR:
+	if ((minor(inode->i_rdev) == WATCHDOG_MINOR)) {
 		spin_lock(&acq_lock);
-			if(acq_is_open)
-			{
+		if(acq_is_open) {
 			spin_unlock(&acq_lock);
 			return -EBUSY;
 		}
-			if (nowayout) {
+		if (nowayout)
 			MOD_INC_USE_COUNT;
-			}
-			/*
-			 *	Activate 
-			 */
 
+		/* Activate */
 		acq_is_open=1;
 		inb_p(WDT_START);      
 		spin_unlock(&acq_lock);
 		return 0;
-		default:
+
+	} else {
 		return -ENODEV;
 	}
 }
 
 static int acq_close(struct inode *inode, struct file *file)
 {
-	if(minor(inode->i_rdev)==WATCHDOG_MINOR)
-	{
+	if(minor(inode->i_rdev)==WATCHDOG_MINOR) {
 		spin_lock(&acq_lock);
-		if (!nowayout) {
+		if (expect_close)
 			inb_p(WDT_STOP);
-		}
+		else
+			printk(KERN_CRIT "WDT closed unexpectedly.  WDT will not stop!\n");
+
 		acq_is_open=0;
 		spin_unlock(&acq_lock);
 	}
@@ -173,10 +184,9 @@ static int acq_notify_sys(struct notifier_block *this, unsigned long code,
 	void *unused)
 {
 	if(code==SYS_DOWN || code==SYS_HALT)
-	{
 		/* Turn the card off */
 		inb_p(WDT_STOP);
-	}
+
 	return NOTIFY_DONE;
 }
  
@@ -196,9 +206,9 @@ static struct file_operations acq_fops = {
 
 static struct miscdevice acq_miscdev=
 {
-	WATCHDOG_MINOR,
-	"watchdog",
-	&acq_fops
+	.minor = WATCHDOG_MINOR,
+	.name = "watchdog",
+	.fops = &acq_fops
 };
 
 
@@ -207,11 +217,11 @@ static struct miscdevice acq_miscdev=
  *	turn the timebomb registers off. 
  */
  
-static struct notifier_block acq_notifier=
+static struct notifier_block acq_notifier =
 {
-	acq_notify_sys,
-	NULL,
-	0
+	.notifier_call = acq_notify_sys,
+	.next = NULL,
+	.priority = 0
 };
 
 static int __init acq_init(void)
@@ -221,13 +231,11 @@ static int __init acq_init(void)
 	spin_lock_init(&acq_lock);
 	if (misc_register(&acq_miscdev))
 		return -ENODEV;
-	if (!request_region(WDT_STOP, 1, "Acquire WDT"))
-		{
+	if (!request_region(WDT_STOP, 1, "Acquire WDT")) {
 		misc_deregister(&acq_miscdev);
 		return -EIO;
 	}
-	if (!request_region(WDT_START, 1, "Acquire WDT"))
-		{
+	if (!request_region(WDT_START, 1, "Acquire WDT")) {
 		release_region(WDT_STOP, 1);
 		misc_deregister(&acq_miscdev);
 		return -EIO;

drivers/char/watchdog/advantechwdt.c

@@ -47,6 +47,7 @@
 #include <linux/smp_lock.h>
 
 static int advwdt_is_open;
+static char adv_expect_close;
 static spinlock_t advwdt_lock;
 
 /*
@@ -99,10 +100,22 @@ advwdt_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
 		return -ESPIPE;
 
 	if (count) {
+		if (!nowayout) {
+			size_t i;
+
+			adv_expect_close = 0;
+
+			for (i = 0; i != count; i++) {
+				char c;
+				if (get_user(c, buf+i))
+					return -EFAULT;
+				if (c == 'V')
+					adv_expect_close = 42;
+			}
+		}
 		advwdt_ping();
-		return 1;
 	}
-	return 0;
+	return count;
 }
 
 static ssize_t
@@ -116,7 +129,9 @@ advwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 	  unsigned long arg)
 {
 	static struct watchdog_info ident = {
-		WDIOF_KEEPALIVEPING, 1, "Advantech WDT"
+		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "Advantech WDT"
 	};
 
 	switch (cmd) {
@@ -143,25 +158,22 @@ advwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 static int
 advwdt_open(struct inode *inode, struct file *file)
 {
-	switch (minor(inode->i_rdev)) {
-		case WATCHDOG_MINOR:
+	if (minor(inode->i_rdev) == WATCHDOG_MINOR) {
 		spin_lock(&advwdt_lock);
 		if (advwdt_is_open) {
 			spin_unlock(&advwdt_lock);
 			return -EBUSY;
 		}
-			if (nowayout) {
+
+		if (nowayout)
 			MOD_INC_USE_COUNT;
-			}
-			/*
-			 *	Activate 
-			 */
 
+		/* Activate */
 		advwdt_is_open = 1;
 		advwdt_ping();
 		spin_unlock(&advwdt_lock);
 		return 0;
-		default:
+	} else {
 		return -ENODEV;
 	}
 }
@@ -171,9 +183,9 @@ advwdt_close(struct inode *inode, struct file *file)
 {
 	if (minor(inode->i_rdev) == WATCHDOG_MINOR) {
 		spin_lock(&advwdt_lock);
-		if (!nowayout) {
+		if (!nowayout)
 			inb_p(WDT_STOP);
-		}
+
 		advwdt_is_open = 0;
 		spin_unlock(&advwdt_lock);
 	}
@@ -188,10 +200,10 @@ static int
 advwdt_notify_sys(struct notifier_block *this, unsigned long code,
 	void *unused)
 {
-	if (code == SYS_DOWN || code == SYS_HALT) {
+	if (code == SYS_DOWN || code == SYS_HALT)
 		/* Turn the WDT off */
 		inb_p(WDT_STOP);
-	}
+
 	return NOTIFY_DONE;
 }
  
@@ -209,9 +221,9 @@ static struct file_operations advwdt_fops = {
 };
 
 static struct miscdevice advwdt_miscdev = {
-	WATCHDOG_MINOR,
-	"watchdog",
-	&advwdt_fops
+	.minor = WATCHDOG_MINOR,
+	.name = "watchdog",
+	.fops = &advwdt_fops
 };
 
 /*
@@ -220,9 +232,9 @@ static struct miscdevice advwdt_miscdev = {
  */
  
 static struct notifier_block advwdt_notifier = {
-	advwdt_notify_sys,
-	NULL,
-	0
+	.notifier_call = advwdt_notify_sys,
+	.next = NULL,
+	.priority = 0
 };
 
 static void __init
@@ -276,5 +288,3 @@ module_exit(advwdt_exit);
 
 MODULE_LICENSE("GPL");
 
-/* end of advantechwdt.c */
-

drivers/char/watchdog/alim7101_wdt.c

+/*
+ *	ALi M7101 PMU Computer Watchdog Timer driver for Linux 2.4.x
+ *
+ *	Based on w83877f_wdt.c by Scott Jennings <management@oro.net>
+ *	and the Cobalt kernel WDT timer driver by Tim Hockin
+ *	                                      <thockin@cobaltnet.com>
+ *
+ *	(c)2002 Steve Hill <steve@navaho.co.uk>
+ * 
+ *  Theory of operation:
+ *  A Watchdog Timer (WDT) is a hardware circuit that can 
+ *  reset the computer system in case of a software fault.
+ *  You probably knew that already.
+ *
+ *  Usually a userspace daemon will notify the kernel WDT driver
+ *  via the /proc/watchdog special device file that userspace is
+ *  still alive, at regular intervals.  When such a notification
+ *  occurs, the driver will usually tell the hardware watchdog
+ *  that everything is in order, and that the watchdog should wait
+ *  for yet another little while to reset the system.
+ *  If userspace fails (RAM error, kernel bug, whatever), the
+ *  notifications cease to occur, and the hardware watchdog will
+ *  reset the system (causing a reboot) after the timeout occurs.
+ *
+ *  This WDT driver is different from most other Linux WDT
+ *  drivers in that the driver will ping the watchdog by itself,
+ *  because this particular WDT has a very short timeout (1.6
+ *  seconds) and it would be insane to count on any userspace
+ *  daemon always getting scheduled within that time frame.
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/sched.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/fcntl.h>
+#include <linux/smp_lock.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+
+#define OUR_NAME "alim7101_wdt"
+
+#define WDT_ENABLE 0x9C
+#define WDT_DISABLE 0x8C
+
+#define ALI_7101_WDT    0x92
+#define ALI_WDT_ARM     0x01
+
+/*
+ * We're going to use a 1 second timeout.
+ * If we reset the watchdog every ~250ms we should be safe.  */
+
+#define WDT_INTERVAL (HZ/4+1)
+
+/*
+ * We must not require too good response from the userspace daemon.
+ * Here we require the userspace daemon to send us a heartbeat
+ * char to /dev/watchdog every 30 seconds.
+ */
+
+#define WDT_HEARTBEAT (HZ * 30)
+
+static void wdt_timer_ping(unsigned long);
+static struct timer_list timer;
+static unsigned long next_heartbeat;
+static unsigned long wdt_is_open;
+static int wdt_expect_close;
+static struct pci_dev *alim7101_pmu;
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+ 
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
+/*
+ *	Whack the dog
+ */
+
+static void wdt_timer_ping(unsigned long data)
+{
+	/* If we got a heartbeat pulse within the WDT_US_INTERVAL
+	 * we agree to ping the WDT 
+	 */
+	char	tmp;
+
+	if(time_before(jiffies, next_heartbeat)) 
+	{
+		/* Ping the WDT (this is actually a disarm/arm sequence) */
+		pci_read_config_byte(alim7101_pmu, 0x92, &tmp);
+		pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
+		pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM));
+	} else {
+		printk(OUR_NAME ": Heartbeat lost! Will not ping the watchdog\n");
+	}
+	/* Re-set the timer interval */
+	timer.expires = jiffies + WDT_INTERVAL;
+	add_timer(&timer);
+}
+
+/* 
+ * Utility routines
+ */
+
+static void wdt_change(int writeval)
+{
+	char	tmp;
+
+	pci_read_config_byte(alim7101_pmu, 0x92, &tmp);
+	if (writeval == WDT_ENABLE)
+		pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM));
+	else
+		pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
+}
+
+static void wdt_startup(void)
+{
+	next_heartbeat = jiffies + WDT_HEARTBEAT;
+
+	/* We must enable before we kick off the timer in case the timer
+	   occurs as we ping it */
+
+	wdt_change(WDT_ENABLE);
+
+	/* Start the timer */
+	timer.expires = jiffies + WDT_INTERVAL;	
+	add_timer(&timer);
+
+
+	printk(OUR_NAME ": Watchdog timer is now enabled.\n");  
+}
+
+static void wdt_turnoff(void)
+{
+	/* Stop the timer */
+	del_timer_sync(&timer);
+	wdt_change(WDT_DISABLE);
+	printk(OUR_NAME ": Watchdog timer is now disabled...\n");
+}
+
+/*
+ * /dev/watchdog handling
+ */
+
+static ssize_t fop_write(struct file * file, const char * buf, size_t count, loff_t * ppos)
+{
+	/* We can't seek */
+	if(ppos != &file->f_pos)
+		return -ESPIPE;
+
+	/* See if we got the magic character */
+	if(count) {
+		if (!nowayout) {
+			size_t ofs;
+
+			/* note: just in case someone wrote the magic character
+			 * five months ago... */
+			wdt_expect_close = 0;
+
+			/* now scan */
+			for (ofs = 0; ofs != count; ofs++) {
+				char c;
+				if (get_user(c, buf+ofs))
+					return -EFAULT;
+				if (c == 'V')
+					wdt_expect_close = 1;
+			}
+		}
+		/* someone wrote to us, we should restart timer */
+		next_heartbeat = jiffies + WDT_HEARTBEAT;
+		return 1;
+	};
+	return 0;
+}
+
+static ssize_t fop_read(struct file * file, char * buf, size_t count, loff_t * ppos)
+{
+	/* No can do */
+	return -EINVAL;
+}
+
+static int fop_open(struct inode * inode, struct file * file)
+{
+	/* Just in case we're already talking to someone... */
+	if(test_and_set_bit(0, &wdt_is_open))
+		return -EBUSY;
+	/* Good, fire up the show */
+	wdt_startup();
+	return 0;
+}
+
+static int fop_close(struct inode * inode, struct file * file)
+{
+	if(wdt_expect_close)
+		wdt_turnoff();
+	else
+		printk(OUR_NAME ": device file closed unexpectedly. Will not stop the WDT!\n");
+
+	clear_bit(0, &wdt_is_open);
+	return 0;
+}
+
+static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	static struct watchdog_info ident =
+	{
+		.options = WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "ALiM7101"
+	};
+	
+	switch(cmd)
+	{
+		case WDIOC_GETSUPPORT:
+			return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;
+		case WDIOC_KEEPALIVE:
+			next_heartbeat = jiffies + WDT_HEARTBEAT;
+			return 0;
+		default:
+			return -ENOTTY;
+	}
+}
+
+static struct file_operations wdt_fops = {
+	.owner=		THIS_MODULE,
+	.llseek=	no_llseek,
+	.read=		fop_read,
+	.write=		fop_write,
+	.open=		fop_open,
+	.release=	fop_close,
+	.ioctl=		fop_ioctl
+};
+
+static struct miscdevice wdt_miscdev = {
+	.minor=WATCHDOG_MINOR,
+	.name="watchdog",
+	.fops=&wdt_fops
+};
+
+/*
+ *	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_turnoff();
+
+	if (code==SYS_RESTART) {
+		/*
+		 * Cobalt devices have no way of rebooting themselves other than
+		 * getting the watchdog to pull reset, so we restart the watchdog on
+		 * reboot with no heartbeat
+		 */
+		wdt_change(WDT_ENABLE);
+		printk(OUR_NAME ": Watchdog timer is now enabled with no heartbeat - should reboot in ~1 second.\n");
+	}
+	return NOTIFY_DONE;
+}
+ 
+/*
+ *	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,
+	.next = 0,
+	.priority = 0
+};
+
+static void __exit alim7101_wdt_unload(void)
+{
+	wdt_turnoff();
+	/* Deregister */
+	misc_deregister(&wdt_miscdev);
+	unregister_reboot_notifier(&wdt_notifier);
+}
+
+static int __init alim7101_wdt_init(void)
+{
+	int rc = -EBUSY;
+	struct pci_dev *ali1543_south;
+	char tmp;
+
+	printk(KERN_INFO OUR_NAME ": Steve Hill <steve@navaho.co.uk>.\n");
+	alim7101_pmu = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101,NULL);
+	if (!alim7101_pmu) {
+		printk(KERN_INFO OUR_NAME ": ALi M7101 PMU not present - WDT not set\n");
+		return -EBUSY;
+	}
+
+	/* Set the WDT in the PMU to 1 second */
+	pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, 0x02);
+
+	ali1543_south = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
+	if (!ali1543_south) {
+		printk(KERN_INFO OUR_NAME ": ALi 1543 South-Bridge not present - WDT not set\n");
+		return -EBUSY;
+	}
+	pci_read_config_byte(ali1543_south, 0x5e, &tmp);
+	if ((tmp & 0x1e) != 0x12) {
+		printk(KERN_INFO OUR_NAME ": ALi 1543 South-Bridge does not have the correct revision number (???1001?) - WDT not set\n");
+		return -EBUSY;
+	}
+
+	init_timer(&timer);
+	timer.function = wdt_timer_ping;
+	timer.data = 1;
+
+	rc = misc_register(&wdt_miscdev);
+	if (rc)
+		return rc;
+
+	rc = register_reboot_notifier(&wdt_notifier);
+	if (rc) {
+		misc_deregister(&wdt_miscdev);
+		return rc;
+	}
+
+	printk(KERN_INFO OUR_NAME ": WDT driver for ALi M7101 initialised.\n");
+	return 0;
+}
+
+module_init(alim7101_wdt_init);
+module_exit(alim7101_wdt_unload);
+
+MODULE_AUTHOR("Steve Hill");
+MODULE_LICENSE("GPL");

drivers/char/watchdog/eurotechwdt.c

@@ -19,7 +19,7 @@
  *	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>*
+ *	(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
@@ -49,6 +49,7 @@
 
 static int eurwdt_is_open;
 static spinlock_t eurwdt_lock;
+static char eur_expect_close;
  
 /*
  * You must set these - there is no sane way to probe for this board.
@@ -80,10 +81,10 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CON
 
 #define WDT_CTRL_REG		0x30
 #define WDT_OUTPIN_CFG		0xe2
-   #define WDT_EVENT_INT	   0x00
-   #define WDT_EVENT_REBOOT	   0x08
+#define WDT_EVENT_INT		0x00
+#define WDT_EVENT_REBOOT	0x08
 #define WDT_UNIT_SEL		0xf1
-   #define WDT_UNIT_SECS	   0x80
+#define WDT_UNIT_SECS		0x80
 #define WDT_TIMEOUT_VAL		0xf2
 #define WDT_TIMER_CFG		0xf3
  
@@ -103,7 +104,7 @@ static int __init eurwdt_setup(char *str)
 {
 	int ints[4];
  
-   str = get_options (str, ARRAY_SIZE(ints), ints);
+str = get_options (str, ARRAY_SIZE(ints), ints);
  
 	if (ints[0] > 0) {
 		io = ints[1];
@@ -170,8 +171,8 @@ static void eurwdt_activate_timer(void)
 {
 	eurwdt_disable_timer();
 	eurwdt_write_reg(WDT_CTRL_REG, 0x01);	/* activate the WDT */
-   eurwdt_write_reg(WDT_OUTPIN_CFG, !strcmp("int", ev) ?
-                                    WDT_EVENT_INT : WDT_EVENT_REBOOT);
+	eurwdt_write_reg(WDT_OUTPIN_CFG, !strcmp("int", ev) ? WDT_EVENT_INT : WDT_EVENT_REBOOT);
+
 	/* Setting interrupt line */
 	if (irq == 2 || irq > 15 || irq < 0) {
 		printk(KERN_ERR ": invalid irq number\n");
@@ -179,6 +180,7 @@ static void eurwdt_activate_timer(void)
 	}
 	if (irq == 0)
 		printk(KERN_INFO ": interrupt disabled\n");
+
 	eurwdt_write_reg(WDT_TIMER_CFG, irq<<4);
 
 	eurwdt_write_reg(WDT_UNIT_SEL, WDT_UNIT_SECS);	/* we use seconds */
@@ -234,6 +236,19 @@ loff_t *ppos)
 	return -ESPIPE;
  
 	if (count) 	{
+		if (!nowayout) {
+			size_t i;
+
+			eur_expect_close = 0;
+
+			for (i = 0; i != count; i++) {
+				char c;
+				if(get_user(c, buf+i))
+					return -EFAULT;
+				if (c == 'V')
+					eur_expect_close = 42;
+			}
+		}
 		eurwdt_ping();	/* the default timeout */
 		return 1;
 	}
@@ -310,9 +325,8 @@ static int eurwdt_open(struct inode *inode, struct file *file)
 			spin_unlock(&eurwdt_lock);
 			return -EBUSY;
 		}
-	 if (nowayout) {
+		 if (nowayout)
 			 MOD_INC_USE_COUNT;
-	 }
 
 		eurwdt_is_open = 1;
 
@@ -322,7 +336,6 @@ static int eurwdt_open(struct inode *inode, struct file *file)
 		spin_unlock(&eurwdt_lock);
 
 		MOD_INC_USE_COUNT;
-
 		return 0;
 
 	case TEMP_MINOR:
@@ -348,11 +361,10 @@ static int eurwdt_open(struct inode *inode, struct file *file)
 static int eurwdt_release(struct inode *inode, struct file *file)
 {
 	if (minor(inode->i_rdev) == WATCHDOG_MINOR) {
-	   if (!nowayout) {
+		if (!nowayout)
 			eurwdt_disable_timer();
-	   }
-	   eurwdt_is_open = 0;
 
+		eurwdt_is_open = 0;
 		MOD_DEC_USE_COUNT;
 	}
 
@@ -479,16 +491,16 @@ static int __init eurwdt_init(void)
 
 	spin_lock_init(&eurwdt_lock);
 
-   out:
+out:
 	return ret;
  
-   outreg:
+outreg:
 	release_region(io, 2);
 
-   outirq:
+outirq:
 	free_irq(irq, NULL);
 
-   outmisc:
+outmisc:
 	misc_deregister(&eurwdt_miscdev);
 	goto out;
 }

drivers/char/watchdog/i810-tco.c

@@ -244,7 +244,9 @@ static int i810tco_ioctl (struct inode *inode, struct file *file,
 	int options, retval = -EINVAL;
 
 	static struct watchdog_info ident = {
-		.options =		WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+		.options =		WDIOF_SETTIMEOUT |
+					WDIOF_KEEPALIVEPING |
+					WDIOF_MAGICCLOSE,
 		.firmware_version =	0,
 		.identity =		"i810 TCO timer",
 	};

drivers/char/watchdog/ib700wdt.c

@@ -54,6 +54,7 @@
 
 static int ibwdt_is_open;
 static spinlock_t ibwdt_lock;
+static int expect_close = 0;
 
 /*
  *
@@ -136,6 +137,21 @@ ibwdt_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
 		return -ESPIPE;
 
 	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 = 1;
+			}
+		}
 		ibwdt_ping();
 		return 1;
 	}
@@ -153,7 +169,9 @@ ibwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 	  unsigned long arg)
 {
 	static struct watchdog_info ident = {
-		WDIOF_KEEPALIVEPING, 1, "IB700 WDT"
+		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "IB700 WDT"
 	};
 
 	switch (cmd) {
@@ -180,25 +198,21 @@ ibwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 static int
 ibwdt_open(struct inode *inode, struct file *file)
 {
-	switch (minor(inode->i_rdev)) {
-		case WATCHDOG_MINOR:
+	if (minor(inode->i_rdev) == WATCHDOG_MINOR) {
 		spin_lock(&ibwdt_lock);
 		if (ibwdt_is_open) {
 			spin_unlock(&ibwdt_lock);
 			return -EBUSY;
 		}
-			if (nowayout) {
+		if (nowayout)
 			MOD_INC_USE_COUNT;
-			}
-			/*
-			 *	Activate
-			 */
 
+		/* Activate */
 		ibwdt_is_open = 1;
 		ibwdt_ping();
 		spin_unlock(&ibwdt_lock);
 		return 0;
-		default:
+	} else {	
 		return -ENODEV;
 	}
 }
@@ -206,16 +220,16 @@ ibwdt_open(struct inode *inode, struct file *file)
 static int
 ibwdt_close(struct inode *inode, struct file *file)
 {
-	lock_kernel();
 	if (minor(inode->i_rdev) == WATCHDOG_MINOR) {
 		spin_lock(&ibwdt_lock);
-		if (!nowayout) {
+		if (expect_close)
 			outb_p(timeout_val, WDT_STOP);
-		}
+		else
+			printk(KERN_CRIT "WDT device closed unexpectedly.  WDT will not stop!\n");
+
 		ibwdt_is_open = 0;
 		spin_unlock(&ibwdt_lock);
 	}
-	unlock_kernel();
 	return 0;
 }
 
@@ -248,9 +262,9 @@ static struct file_operations ibwdt_fops = {
 };
 
 static struct miscdevice ibwdt_miscdev = {
-	WATCHDOG_MINOR,
-	"watchdog",
-	&ibwdt_fops
+	.minor = WATCHDOG_MINOR,
+	.name = "watchdog",
+	.fops = &ibwdt_fops
 };
 
 /*
@@ -259,9 +273,9 @@ static struct miscdevice ibwdt_miscdev = {
  */
 
 static struct notifier_block ibwdt_notifier = {
-	ibwdt_notify_sys,
-	NULL,
-	0
+	.notifier_call = ibwdt_notify_sys,
+	.next = NULL,
+	.priority = 0
 };
 
 static int __init

drivers/char/watchdog/indydog.c

+/*
+ *	IndyDog	0.2	A Hardware Watchdog Device for SGI IP22
+ *
+ *	(c) Copyright 2002 Guido Guenther <agx@sigxcpu.org>, 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.
+ *	
+ *	based on softdog.c by Alan Cox <alan@redhat.com>
+ */
+ 
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <asm/sgi/sgimc.h>
+
+static unsigned long indydog_alive;
+static struct sgimc_misc_ctrl *mcmisc_regs; 
+static int expect_close = 0;
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
+static void indydog_ping()
+{
+	mcmisc_regs->watchdogt = 0;
+}
+
+
+/*
+ *	Allow only one person to hold it open
+ */
+
+static int indydog_open(struct inode *inode, struct file *file)
+{
+	u32 mc_ctrl0;
+	
+	if( test_and_set_bit(0,&indydog_alive) )
+		return -EBUSY;
+
+	if (nowayout)
+		MOD_INC_USE_COUNT;
+
+	/*
+	 *	Activate timer
+	 */
+	mcmisc_regs = (struct sgimc_misc_ctrl *)(KSEG1+0x1fa00000);
+
+	mc_ctrl0 = mcmisc_regs->cpuctrl0 | SGIMC_CCTRL0_WDOG;
+	mcmisc_regs->cpuctrl0 = mc_ctrl0;
+	indydog_ping();
+			
+	printk("Started watchdog timer.\n");
+	return 0;
+}
+
+static int indydog_release(struct inode *inode, struct file *file)
+{
+	/*
+	 *	Shut off the timer.
+	 * 	Lock it in if it's a module and we set nowayout
+	 */
+
+	if (expect_close) {
+		u32 mc_ctrl0 = mcmisc_regs->cpuctrl0; 
+		mc_ctrl0 &= ~SGIMC_CCTRL0_WDOG;
+		mcmisc_regs->cpuctrl0 = mc_ctrl0;
+		printk("Stopped watchdog timer.\n");
+	} else {
+		printk(KERN_CRIT "WDT device closed unexpectedly.  WDT will not stop!\n");
+	}
+	clear_bit(0,&indydog_alive);
+	return 0;
+}
+
+static ssize_t indydog_write(struct file *file, const char *data, size_t len, loff_t *ppos)
+{
+	/*  Can't seek (pwrite) on this device  */
+	if (ppos != &file->f_pos)
+		return -ESPIPE;
+
+	/* Refresh the timer. */
+	if (len) {
+		if (!nowayout) {
+			size_t i;
+
+			/* In case it was set long ago */
+			expect_close = 0;
+
+			for (i = 0; i != len; i++) {
+				char c;
+
+				if (get_user(c, data + i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_close = 1;
+			}
+		}
+		indydog_ping();
+		return 1;
+	}
+	return 0;
+}
+
+static int indydog_ioctl(struct inode *inode, struct file *file,
+	unsigned int cmd, unsigned long arg)
+{
+	static struct watchdog_info ident = {
+		.options = WDIOF_MAGICCLOSE,
+		.identity = "Hardware Watchdog for SGI IP22",
+	};
+
+	switch (cmd) {
+		default:
+			return -ENOIOCTLCMD;
+		case WDIOC_GETSUPPORT:
+			if(copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident)))
+				return -EFAULT;
+			return 0;
+		case WDIOC_GETSTATUS:
+		case WDIOC_GETBOOTSTATUS:
+			return put_user(0,(int *)arg);
+		case WDIOC_KEEPALIVE:
+			indydog_ping();
+			return 0;
+	}
+}
+
+static struct file_operations indydog_fops = {
+	.owner	= THIS_MODULE,
+	.write	= indydog_write,
+	.ioctl	= indydog_ioctl,
+	.open	= indydog_open,
+	.release= indydog_release,
+};
+
+static struct miscdevice indydog_miscdev = {
+	.minor	= WATCHDOG_MINOR,
+	.name	= "watchdog",
+	.fops	= &indydog_fops,
+};
+
+static const char banner[] __initdata = KERN_INFO "Hardware Watchdog Timer for SGI IP22: 0.2\n";
+
+static int __init watchdog_init(void)
+{
+	int ret;
+
+	ret = misc_register(&indydog_miscdev);
+
+	if (ret)
+		return ret;
+
+	printk(banner);
+
+	return 0;
+}
+
+static void __exit watchdog_exit(void)
+{
+	misc_deregister(&indydog_miscdev);
+}
+
+module_init(watchdog_init);
+module_exit(watchdog_exit);
+MODULE_LICENSE("GPL");

drivers/char/watchdog/machzwd.c

@@ -117,7 +117,7 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CON
 #define PFX "machzwd"
 
 static struct watchdog_info zf_info = {
-	.options		= WDIOF_KEEPALIVEPING, 
+	.options		= WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, 
 	.firmware_version	= 1, 
 	.identity		= "ZF-Logic watchdog"
 };
@@ -314,7 +314,7 @@ static ssize_t zf_write(struct file *file, const char *buf, size_t count,
 	/* See if we got the magic character */
 	if(count){
 
-/*
+		/*
 		 * no need to check for close confirmation
 		 * no way to disable watchdog ;)
 		 */
@@ -328,7 +328,7 @@ static ssize_t zf_write(struct file *file, const char *buf, size_t count,
 			zf_expect_close = 0;
 			
 			/* now scan */
-			for(ofs = 0; ofs != count; ofs++){
+			for (ofs = 0; ofs != count; ofs++){
 				char c;
 				if (get_user(c, buf + ofs))
 					return -EFAULT;
@@ -338,6 +338,7 @@ static ssize_t zf_write(struct file *file, const char *buf, size_t count,
 				}
 			}
 		}
+
 		/*
 		 * Well, anyhow someone wrote to us,
 		 * we should return that favour
@@ -395,9 +396,9 @@ static int zf_open(struct inode *inode, struct file *file)
 				return -EBUSY;
 			}
 
-			if (nowayout) {
+			if (nowayout)
 				MOD_INC_USE_COUNT;
-			}
+
 			zf_is_open = 1;
 
 			spin_unlock(&zf_lock);

drivers/char/watchdog/mixcomwd.c

@@ -62,6 +62,7 @@ static long mixcomwd_opened; /* long req'd for setbit --RR */
 static int watchdog_port;
 static int mixcomwd_timer_alive;
 static struct timer_list mixcomwd_timer = TIMER_INITIALIZER(NULL, 0, 0);
+static int expect_close = 0;
 
 #ifdef CONFIG_WATCHDOG_NOWAYOUT
 static int nowayout = 1;
@@ -109,8 +110,7 @@ static int mixcomwd_open(struct inode *inode, struct file *file)
 
 static int mixcomwd_release(struct inode *inode, struct file *file)
 {
-
-	if (!nowayout) {
+	if (expect_close) {
 		if(mixcomwd_timer_alive) {
 			printk(KERN_ERR "mixcomwd: release called while internal timer alive");
 			return -EBUSY;
@@ -121,7 +121,10 @@ static int mixcomwd_release(struct inode *inode, struct file *file)
 		mixcomwd_timer.data=0;
 		mixcomwd_timer_alive=1;
 		add_timer(&mixcomwd_timer);
+	} else {
+		printk(KERN_CRIT "mixcomwd: WDT device closed unexpectedly.  WDT will not stop!\n");
 	}
+
 	clear_bit(0,&mixcomwd_opened);
 	return 0;
 }
@@ -135,6 +138,20 @@ static ssize_t mixcomwd_write(struct file *file, const char *data, size_t len, l
 
 	if(len)
 	{
+		if (!nowayout) {
+			size_t i;
+
+			/* In case it was set long ago */
+			expect_close = 0;
+
+			for (i = 0; i != len; i++) {
+				char c;
+				if (get_user(c, data + i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_close = 1;
+			}
+		}
 		mixcomwd_ping();
 		return 1;
 	}
@@ -146,7 +163,9 @@ static int mixcomwd_ioctl(struct inode *inode, struct file *file,
 {
 	int status;
 	static struct watchdog_info ident = {
-		WDIOF_KEEPALIVEPING, 1, "MixCOM watchdog"
+		.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "MixCOM watchdog"
 	};
                                         
 	switch(cmd)

drivers/char/watchdog/pcwd.c

@@ -40,6 +40,8 @@
  *		fairly useless proc entry.
  * 990610	removed said useless proc code for the merge <alan>
  * 000403	Removed last traces of proc code. <davej>
+ * 011214	Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com>
+ *              Added timeout module option to override default
  */
 
 #include <linux/module.h>
@@ -76,7 +78,7 @@
  */
 static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 };
 
-#define WD_VER                  "1.10 (06/05/99)"
+#define WD_VER                  "1.12 (12/14/2001)"
 
 /*
  * It should be noted that PCWD_REVISION_B was removed because A and B
@@ -88,7 +90,23 @@ static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 };
 #define	PCWD_REVISION_A		1
 #define	PCWD_REVISION_C		2
 
-#define	WD_TIMEOUT		3	/* 1 1/2 seconds for a timeout */
+#define	WD_TIMEOUT		4	/* 2 seconds for a timeout */
+static int timeout_val = WD_TIMEOUT;
+static int timeout = 2;
+static int expect_close = 0;
+
+MODULE_PARM(timeout,"i");
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default=2)"); 
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
 
 /*
  * These are the defines for the PC Watchdog card, revision A.
@@ -121,7 +139,7 @@ static int __init pcwd_checkcard(void)
 	if (prev_card_dat == 0xFF)
 		return 0;
 
-	while(count < WD_TIMEOUT) {
+	while(count < timeout_val) {
 
 	/* Read the raw card data from the port, and strip off the
 	   first 4 bits */
@@ -256,7 +274,7 @@ static int pcwd_ioctl(struct inode *inode, struct file *file,
 		else
 			cdat = inb(current_readport + 1 );
 		spin_unlock(&io_lock);
-		rv = 0;
+		rv = WDIOF_MAGICCLOSE;
 
 		if (revision == PCWD_REVISION_A) 
 		{
@@ -385,8 +403,22 @@ static ssize_t pcwd_write(struct file *file, const char *buf, size_t len,
 	if (ppos != &file->f_pos)
 		return -ESPIPE;
 
-	if (len)
-	{
+	if (len) {
+		if (!nowayout) {
+			size_t i;
+
+			/* In case it was set long ago */
+			expect_close = 0;
+
+			for (i = 0; i != len; i++) {
+				char c;
+
+				if (get_user(c, buf + i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_close = 1;
+			}
+		}
 		pcwd_send_heartbeat();
 		return 1;
 	}
@@ -395,23 +427,21 @@ static ssize_t pcwd_write(struct file *file, const char *buf, size_t len,
 
 static int pcwd_open(struct inode *ino, struct file *filep)
 {
-        switch (minor(ino->i_rdev))
-        {
+	switch (minor(ino->i_rdev)) {
 	case WATCHDOG_MINOR:
-                    if ( !atomic_dec_and_test(&open_allowed) )
-		    {
+		if (!atomic_dec_and_test(&open_allowed) ) {
 			atomic_inc( &open_allowed );
 			return -EBUSY;
 		}
 		MOD_INC_USE_COUNT;
 		/*  Enable the port  */
-                    if (revision == PCWD_REVISION_C)
-                    {
+		if (revision == PCWD_REVISION_C) {
 			spin_lock(&io_lock);
 			outb_p(0x00, current_readport + 3);
 			spin_unlock(&io_lock);
 		}
 		return(0);
+
 	case TEMP_MINOR:
 		return(0);
 	default:
@@ -448,9 +478,8 @@ static ssize_t pcwd_read(struct file *file, char *buf, size_t count,
 
 static int pcwd_close(struct inode *ino, struct file *filep)
 {
-	if (minor(ino->i_rdev)==WATCHDOG_MINOR)
-	{
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+	if (minor(ino->i_rdev)==WATCHDOG_MINOR) {
+		if (expect_close) {
 			/*  Disable the board  */
 			if (revision == PCWD_REVISION_C) {
 				spin_lock(&io_lock);
@@ -459,7 +488,7 @@ static int pcwd_close(struct inode *ino, struct file *filep)
 				spin_unlock(&io_lock);
 			}
 			atomic_inc( &open_allowed );
-#endif
+		}
 	}
 	return 0;
 }
@@ -560,9 +589,15 @@ static struct miscdevice temp_miscdev = {
 	&pcwd_fops
 };
  
+static void __init pcwd_validate_timeout(void)
+{
+	timeout_val = timeout * 2;
+}
+ 
 static int __init pcwatchdog_init(void)
 {
 	int i, found = 0;
+	pcwd_validate_timeout();
 	spin_lock_init(&io_lock);
 	
 	revision = PCWD_REVISION_A;

drivers/char/watchdog/sbc60xxwdt.c

@@ -244,9 +244,9 @@ static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 {
 	static struct watchdog_info ident=
 	{
-		0,
-		1,
-		"SB60xx"
+		.options = WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "SB60xx"
 	};
 	
 	switch(cmd)

drivers/char/watchdog/sc520_wdt.c

+/*
+ *	AMD Elan SC520 processor Watchdog Timer driver for Linux 2.4.x
+ *
+ *      Based on acquirewdt.c by Alan Cox,
+ *           and sbc60xxwdt.c by Jakob Oestergaard <jakob@ostenfeld.dk>
+ *     
+ *	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.
+ *	
+ *	The authors do NOT admit liability nor provide warranty for 
+ *	any of this software. This material is provided "AS-IS" in 
+ *      the hope that it may be useful for others.
+ *
+ *	(c) Copyright 2001    Scott Jennings <linuxdrivers@oro.net>
+ *           9/27 - 2001      [Initial release]
+ *	
+ *	Additional fixes Alan Cox
+ *	-	Fixed formatting
+ *	-	Removed debug printks
+ *	-	Fixed SMP built kernel deadlock
+ *	-	Switched to private locks not lock_kernel
+ *	-	Used ioremap/writew/readw
+ *	-	Added NOWAYOUT support
+ *
+ *  Theory of operation:
+ *  A Watchdog Timer (WDT) is a hardware circuit that can 
+ *  reset the computer system in case of a software fault.
+ *  You probably knew that already.
+ *
+ *  Usually a userspace daemon will notify the kernel WDT driver
+ *  via the /proc/watchdog special device file that userspace is
+ *  still alive, at regular intervals.  When such a notification
+ *  occurs, the driver will usually tell the hardware watchdog
+ *  that everything is in order, and that the watchdog should wait
+ *  for yet another little while to reset the system.
+ *  If userspace fails (RAM error, kernel bug, whatever), the
+ *  notifications cease to occur, and the hardware watchdog will
+ *  reset the system (causing a reboot) after the timeout occurs.
+ *
+ *  This WDT driver is different from most other Linux WDT
+ *  drivers in that the driver will ping the watchdog by itself,
+ *  because this particular WDT has a very short timeout (1.6
+ *  seconds) and it would be insane to count on any userspace
+ *  daemon always getting scheduled within that time frame.
+ *
+ *  This driver uses memory mapped IO, and spinlock.
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/sched.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/fcntl.h>
+#include <linux/smp_lock.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+
+/*
+ * The SC520 can timeout anywhere from 492us to 32.21s.
+ * If we reset the watchdog every ~250ms we should be safe.
+ */
+
+#define WDT_INTERVAL (HZ/4+1)
+
+/*
+ * We must not require too good response from the userspace daemon.
+ * Here we require the userspace daemon to send us a heartbeat
+ * char to /dev/watchdog every 30 seconds.
+ */
+
+#define WDT_HEARTBEAT (HZ * 30)
+
+/*
+ * AMD Elan SC520 timeout value is 492us times a power of 2 (0-7)
+ *
+ *   0: 492us    2: 1.01s    4: 4.03s   6: 16.22s
+ *   1: 503ms    3: 2.01s    5: 8.05s   7: 32.21s
+ */
+
+#define TIMEOUT_EXPONENT ( 1 << 3 )  /* 0x08 = 2.01s */
+
+/* #define MMCR_BASE_DEFAULT 0xfffef000 */
+#define MMCR_BASE_DEFAULT ((__u16 *)0xffffe)
+#define OFFS_WDTMRCTL ((unsigned int)0xcb0)
+#define WDT_ENB 0x8000		/* [15] Watchdog Timer Enable */
+#define WDT_WRST_ENB 0x4000	/* [14] Watchdog Timer Reset Enable */
+
+#define OUR_NAME "sc520_wdt"
+
+#define WRT_DOG(data) *wdtmrctl=data
+
+static __u16 *wdtmrctl;
+
+static void wdt_timer_ping(unsigned long);
+static struct timer_list timer;
+static unsigned long next_heartbeat;
+static unsigned long wdt_is_open;
+static int wdt_expect_close;
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
+static spinlock_t wdt_spinlock;
+/*
+ *	Whack the dog
+ */
+
+static void wdt_timer_ping(unsigned long data)
+{
+	/* If we got a heartbeat pulse within the WDT_US_INTERVAL
+	 * we agree to ping the WDT 
+	 */
+	if(time_before(jiffies, next_heartbeat)) 
+	{
+		/* Ping the WDT */
+		spin_lock(&wdt_spinlock);
+		writew(0xAAAA, wdtmrctl);
+		writew(0x5555, wdtmrctl);
+		spin_unlock(&wdt_spinlock);
+
+		/* Re-set the timer interval */
+		timer.expires = jiffies + WDT_INTERVAL;
+		add_timer(&timer);
+	} else {
+		printk(OUR_NAME ": Heartbeat lost! Will not ping the watchdog\n");
+	}
+}
+
+/* 
+ * Utility routines
+ */
+
+static void wdt_config(int writeval)
+{
+	__u16 dummy;
+	unsigned long flags;
+
+	/* buy some time (ping) */
+	spin_lock_irqsave(&wdt_spinlock, flags);
+	dummy=readw(wdtmrctl);  /* ensure write synchronization */
+	writew(0xAAAA, wdtmrctl);
+	writew(0x5555, wdtmrctl);
+	/* make WDT configuration register writable one time */
+	writew(0x3333, wdtmrctl);
+	writew(0xCCCC, wdtmrctl);
+	/* write WDT configuration register */
+	writew(writeval, wdtmrctl);
+	spin_unlock_irqrestore(&wdt_spinlock, flags);
+}
+
+static void wdt_startup(void)
+{
+	next_heartbeat = jiffies + WDT_HEARTBEAT;
+
+	/* Start the timer */
+	timer.expires = jiffies + WDT_INTERVAL;	
+	add_timer(&timer);
+
+	wdt_config(WDT_ENB | WDT_WRST_ENB | TIMEOUT_EXPONENT);
+	printk(OUR_NAME ": Watchdog timer is now enabled.\n");  
+}
+
+static void wdt_turnoff(void)
+{
+	if (!nowayout) {
+		/* Stop the timer */
+		del_timer(&timer);
+		wdt_config(0);
+		printk(OUR_NAME ": Watchdog timer is now disabled...\n");
+	}
+}
+
+
+/*
+ * /dev/watchdog handling
+ */
+
+static ssize_t fop_write(struct file * file, const char * buf, size_t count, loff_t * ppos)
+{
+	/* We can't seek */
+	if(ppos != &file->f_pos)
+		return -ESPIPE;
+
+	/* See if we got the magic character */
+	if(count) 
+	{
+		size_t ofs;
+
+		/* note: just in case someone wrote the magic character
+		 * five months ago... */
+		wdt_expect_close = 0;
+
+		/* now scan */
+		for(ofs = 0; ofs != count; ofs++) {
+			char c;
+			if (get_user(c, buf + ofs))
+				return -EFAULT;
+			if(c == 'V')
+				wdt_expect_close = 1;
+		}
+
+		/* Well, anyhow someone wrote to us, we should return that favour */
+		next_heartbeat = jiffies + WDT_HEARTBEAT;
+		return 1;
+	}
+	return 0;
+}
+
+static int fop_open(struct inode * inode, struct file * file)
+{
+	switch(minor(inode->i_rdev)) 
+	{
+		case WATCHDOG_MINOR:
+			/* Just in case we're already talking to someone... */
+			if(test_and_set_bit(0, &wdt_is_open))
+				return -EBUSY;
+			/* Good, fire up the show */
+			wdt_startup();
+			if (nowayout)
+				MOD_INC_USE_COUNT;
+
+			return 0;
+		default:
+			return -ENODEV;
+	}
+}
+
+static int fop_close(struct inode * inode, struct file * file)
+{
+	if(minor(inode->i_rdev) == WATCHDOG_MINOR) 
+	{
+		if(wdt_expect_close)
+			wdt_turnoff();
+		else {
+			del_timer(&timer);
+			printk(OUR_NAME ": device file closed unexpectedly. Will not stop the WDT!\n");
+		}
+	}
+	clear_bit(0, &wdt_is_open);
+	return 0;
+}
+
+static long long fop_llseek(struct file *file, long long offset, int origin)
+{
+	return -ESPIPE;
+}
+
+static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+	unsigned long arg)
+{
+	static struct watchdog_info ident=
+	{
+		.options = WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "SC520"
+	};
+	
+	switch(cmd)
+	{
+		default:
+			return -ENOIOCTLCMD;
+		case WDIOC_GETSUPPORT:
+			return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;
+		case WDIOC_KEEPALIVE:
+			next_heartbeat = jiffies + WDT_HEARTBEAT;
+			return 0;
+	}
+}
+
+static struct file_operations wdt_fops = {
+	owner:		THIS_MODULE,
+	llseek:		fop_llseek,
+	write:		fop_write,
+	open:		fop_open,
+	release:	fop_close,
+	ioctl:		fop_ioctl
+};
+
+static struct miscdevice wdt_miscdev = {
+	WATCHDOG_MINOR,
+	"watchdog",
+	&wdt_fops
+};
+
+/*
+ *	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_turnoff();
+	return NOTIFY_DONE;
+}
+ 
+/*
+ *	The WDT needs to learn about soft shutdowns in order to
+ *	turn the timebomb registers off. 
+ */
+ 
+static struct notifier_block wdt_notifier=
+{
+	wdt_notify_sys,
+	0,
+	0
+};
+
+static void __exit sc520_wdt_unload(void)
+{
+	wdt_turnoff();
+
+	/* Deregister */
+	misc_deregister(&wdt_miscdev);
+	iounmap(wdtmrctl);
+	unregister_reboot_notifier(&wdt_notifier);
+}
+
+static int __init sc520_wdt_init(void)
+{
+	int rc = -EBUSY;
+	unsigned long cbar;
+
+	spin_lock_init(&wdt_spinlock);
+
+	init_timer(&timer);
+	timer.function = wdt_timer_ping;
+	timer.data = 0;
+
+	rc = misc_register(&wdt_miscdev);
+	if (rc)
+		goto err_out_region2;
+
+	rc = register_reboot_notifier(&wdt_notifier);
+	if (rc)
+		goto err_out_miscdev;
+
+	/* get the Base Address Register */
+	cbar = inl_p(0xfffc);
+	printk(OUR_NAME ": CBAR: 0x%08lx\n", cbar);
+	/* check if MMCR aliasing bit is set */
+	if (cbar & 0x80000000) {
+		printk(OUR_NAME ": MMCR Aliasing enabled.\n");
+		wdtmrctl = (__u16 *)(cbar & 0x3fffffff);
+	} else {
+		printk(OUR_NAME "!!! WARNING !!!\n"
+		  "\t MMCR Aliasing found NOT enabled!\n"
+		  "\t Using default value of: %p\n"
+		  "\t This has not been tested!\n"
+		  "\t Please email Scott Jennings <smj@oro.net>\n"
+		  "\t  and Bill Jennings <bj@oro.net> if it works!\n"
+		  , MMCR_BASE_DEFAULT
+		  );
+	  wdtmrctl = MMCR_BASE_DEFAULT;
+	}
+
+	wdtmrctl = (__u16 *)((char *)wdtmrctl + OFFS_WDTMRCTL);
+	wdtmrctl = ioremap((unsigned long)wdtmrctl, 2);
+	printk(KERN_INFO OUR_NAME ": WDT driver for SC520 initialised.\n");
+
+	return 0;
+
+err_out_miscdev:
+	misc_deregister(&wdt_miscdev);
+err_out_region2:
+	return rc;
+}
+
+module_init(sc520_wdt_init);
+module_exit(sc520_wdt_unload);
+
+MODULE_AUTHOR("Scott and Bill Jennings");
+MODULE_DESCRIPTION("Driver for watchdog timer in AMD \"Elan\" SC520 uProcessor");
+MODULE_LICENSE("GPL");
+EXPORT_NO_SYMBOLS;

drivers/char/watchdog/shwdt.c

@@ -334,21 +334,21 @@ static struct file_operations sh_wdt_fops = {
 };
 
 static struct watchdog_info sh_wdt_info = {
-	WDIOF_KEEPALIVEPING,
-	1,
-	"SH WDT",
+	.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+	.firmware_version = 1,
+	.identity = "SH WDT",
 };
 
 static struct notifier_block sh_wdt_notifier = {
-	sh_wdt_notify_sys,
-	NULL,
-	0
+	.notifier_call = sh_wdt_notify_sys,
+	.next = NULL,
+	.priority = 0
 };
 
 static struct miscdevice sh_wdt_miscdev = {
-	WATCHDOG_MINOR,
-	"watchdog",
-	&sh_wdt_fops,
+	.minor = WATCHDOG_MINOR,
+	.name = "watchdog",
+	.fops &sh_wdt_fops,
 };
 
 /**

drivers/char/watchdog/softdog.c

@@ -47,6 +47,7 @@
 
 #define TIMER_MARGIN	60		/* (secs) Default is 1 minute */
 
+static int expect_close = 0;
 static int soft_margin = TIMER_MARGIN;	/* in seconds */
 
 MODULE_PARM(soft_margin,"i");
@@ -114,6 +115,8 @@ static int softdog_release(struct inode *inode, struct file *file)
 	 */
 	if(!nowayout) {
 		del_timer(&watchdog_ticktock);
+	} else {
+		printk(KERN_CRIT "SOFTDOG: WDT device closed unexpectedly.  WDT will not stop!\n");
 	}
 	timer_alive=0;
 	return 0;
@@ -129,6 +132,21 @@ static ssize_t softdog_write(struct file *file, const char *data, size_t len, lo
 	 *	Refresh the timer.
 	 */
 	if(len) {
+		if (!nowayout) {
+			size_t i;
+
+			/* In case it was set long ago */
+			expect_close = 0;
+
+			for (i = 0; i != len; i++) {
+				char c;
+
+				if (get_user(c, data + i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_close = 1;
+			}
+		}
 		mod_timer(&watchdog_ticktock, jiffies+(soft_margin*HZ));
 		return 1;
 	}
@@ -139,6 +157,7 @@ static int softdog_ioctl(struct inode *inode, struct file *file,
 	unsigned int cmd, unsigned long arg)
 {
 	static struct watchdog_info ident = {
+		.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
 		.identity = "Software Watchdog",
 	};
 	switch (cmd) {

drivers/char/watchdog/w83877f_wdt.c

@@ -251,9 +251,9 @@ static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 {
 	static struct watchdog_info ident=
 	{
-		0,
-		1,
-		"W83877F"
+		.options = WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "W83877F"
 	};
 	
 	switch(cmd)

drivers/char/watchdog/wafer5823wdt.c

+/*
+ *	ICP Wafer 5823 Single Board Computer WDT driver for Linux 2.4.x
+ *      http://www.icpamerica.com/wafer_5823.php
+ *      May also work on other similar models
+ *
+ *	(c) Copyright 2002 Justin Cormack <justin@street-vision.com>
+ *
+ *      Release 0.02
+ *
+ *	Based on advantechwdt.c which is based on wdt.c.
+ *	Original copyright messages:
+ *
+ *	(c) Copyright 1996-1997 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@lxorguk.ukuu.org.uk>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/ioport.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+
+static unsigned long wafwdt_is_open;
+static spinlock_t wafwdt_lock;
+static int expect_close = 0;
+
+/*
+ *	You must set these - there is no sane way to probe for this board.
+ *
+ *      To enable, write the timeout value in seconds (1 to 255) to I/O
+ *      port WDT_START, then read the port to start the watchdog. To pat
+ *      the dog, read port WDT_STOP to stop the timer, then read WDT_START
+ *      to restart it again.
+ */
+
+#define WDT_START 0x443
+#define WDT_STOP 0x843
+
+#define WD_TIMO 60		/* 1 minute */
+static int wd_margin = WD_TIMO;
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
+static void wafwdt_ping(void)
+{
+	/* pat watchdog */
+        spin_lock(&wafwdt_lock);
+	inb_p(WDT_STOP);
+	inb_p(WDT_START);
+        spin_unlock(&wafwdt_lock);
+}
+
+static void wafwdt_start(void)
+{
+	/* start up watchdog */
+	outb_p(wd_margin, WDT_START);
+	inb_p(WDT_START);
+}
+
+static void
+wafwdt_stop(void)
+{
+	/* stop watchdog */
+	inb_p(WDT_STOP);
+}
+
+static ssize_t wafwdt_write(struct file *file, const char *buf, size_t count, loff_t * ppos)
+{
+	/*  Can't seek (pwrite) on this device  */
+	if (ppos != &file->f_pos)
+		return -ESPIPE;
+
+	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 = 1;
+			}
+		}
+		wafwdt_ping();
+		return 1;
+	}
+	return 0;
+}
+
+static int wafwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+	     unsigned long arg)
+{
+	int new_margin;
+	static struct watchdog_info ident = {
+		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "Wafer 5823 WDT"
+	};
+	int one=1;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		if (copy_to_user
+		    ((struct watchdog_info *) arg, &ident, sizeof (ident)))
+			return -EFAULT;
+		break;
+
+	case WDIOC_GETSTATUS:
+		if (copy_to_user((int *) arg, &one, sizeof (int)))
+			return -EFAULT;
+		break;
+
+	case WDIOC_KEEPALIVE:
+		wafwdt_ping();
+		break;
+
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_margin, (int *)arg))
+			return -EFAULT;
+		if ((new_margin < 1) || (new_margin > 255))
+			return -EINVAL;
+		wd_margin = new_margin;
+		wafwdt_stop();
+		wafwdt_start();
+		/* Fall */
+	case WDIOC_GETTIMEOUT:
+		return put_user(wd_margin, (int *)arg);
+
+	default:
+		return -ENOTTY;
+	}
+	return 0;
+}
+
+static int wafwdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &wafwdt_is_open))
+		return -EBUSY;
+	wafwdt_start();
+	return 0;
+}
+
+static int
+wafwdt_close(struct inode *inode, struct file *file)
+{
+	clear_bit(0, &wafwdt_is_open);
+	if (expect_close) {   
+		wafwdt_stop();
+	} else {
+		printk(KERN_CRIT "WDT device closed unexpectedly.  WDT will not stop!\n");
+	}
+	return 0;
+}
+
+/*
+ *	Notifier for system down
+ */
+
+static int wafwdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
+{
+	if (code == SYS_DOWN || code == SYS_HALT) {
+		/* Turn the WDT off */
+		wafwdt_stop();
+	}
+	return NOTIFY_DONE;
+}
+
+/*
+ *	Kernel Interfaces
+ */
+
+static struct file_operations wafwdt_fops = {
+	owner:THIS_MODULE,
+	write:wafwdt_write,
+	ioctl:wafwdt_ioctl,
+	open:wafwdt_open,
+	release:wafwdt_close,
+};
+
+static struct miscdevice wafwdt_miscdev = {
+	WATCHDOG_MINOR,
+	"watchdog",
+	&wafwdt_fops
+};
+
+/*
+ *	The WDT needs to learn about soft shutdowns in order to
+ *	turn the timebomb registers off. 
+ */
+
+static struct notifier_block wafwdt_notifier = {
+	wafwdt_notify_sys,
+	NULL,
+	0
+};
+
+static int __init wafwdt_init(void)
+{
+	printk(KERN_INFO "WDT driver for Wafer 5823 single board computer initialising.\n");
+
+	spin_lock_init(&wafwdt_lock);
+	if(!request_region(WDT_STOP, 1, "Wafer 5823 WDT"))
+		goto error;
+	if(!request_region(WDT_START, 1, "Wafer 5823 WDT"))
+		goto error2;
+	if(misc_register(&wafwdt_miscdev)<0)
+		goto error3;
+	register_reboot_notifier(&wafwdt_notifier);
+	return 0;
+error3:
+	release_region(WDT_START, 1);
+error2:
+	release_region(WDT_STOP, 1);
+error:
+	return -ENODEV;
+}
+
+static void __exit wafwdt_exit(void)
+{
+	misc_deregister(&wafwdt_miscdev);
+	unregister_reboot_notifier(&wafwdt_notifier);
+	release_region(WDT_STOP, 1);
+	release_region(WDT_START, 1);
+}
+
+module_init(wafwdt_init);
+module_exit(wafwdt_exit);
+
+MODULE_AUTHOR("Justin Cormack");
+MODULE_LICENSE("GPL");
+EXPORT_NO_SYMBOLS;
+
+/* end of wafer5823wdt.c */

drivers/char/watchdog/wdt.c

@@ -52,6 +52,7 @@
 #include <asm/system.h>
 
 static unsigned long wdt_is_open;
+static int expect_close;
 
 /*
  *	You must set these - there is no sane way to probe for this board.
@@ -258,8 +259,21 @@ static ssize_t wdt_write(struct file *file, const char *buf, size_t count, loff_
 	if (ppos != &file->f_pos)
 		return -ESPIPE;
 
-	if(count)
-	{
+	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 = 1;
+			}
+		}
 		wdt_ping();
 		return 1;
 	}
@@ -317,10 +331,11 @@ static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 {
 	static struct watchdog_info ident=
 	{
-		WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER
-			|WDIOF_EXTERN1|WDIOF_EXTERN2|WDIOF_FANFAULT,
-		1,
-		"WDT500/501"
+		.options = WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER
+					|WDIOF_EXTERN1|WDIOF_EXTERN2|WDIOF_FANFAULT
+					|WDIOF_SETTIMEOUT|WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "WDT500/501"
 	};
 	
 	ident.options&=WDT_OPTION_MASK;	/* Mask down to the card we have */
@@ -399,9 +414,11 @@ static int wdt_release(struct inode *inode, struct file *file)
 {
 	if(minor(inode->i_rdev)==WATCHDOG_MINOR)
 	{
-		if (!nowayout) {
+		if (expect_close) {
 			inb_p(WDT_DC);		/* Disable counters */
 			wdt_ctr_load(2,0);	/* 0 length reset pulses now */
+		} else {
+			printk(KERN_CRIT "wdt: WDT device closed unexpectedly.  WDT will not stop!\n");
 		}
 		clear_bit(0, &wdt_is_open);
 	}

drivers/char/watchdog/wdt977.c

@@ -41,6 +41,7 @@ static	int timeout = DEFAULT_TIMEOUT*60;	/* TO in seconds from user */
 static	int timeoutM = DEFAULT_TIMEOUT;		/* timeout in minutes */
 static	unsigned long timer_alive;
 static	int testmode;
+static int expect_close = 0;
 
 MODULE_PARM(timeout, "i");
 MODULE_PARM_DESC(timeout,"Watchdog timeout in seconds (60..15300), default=60");
@@ -196,6 +197,8 @@ static int wdt977_release(struct inode *inode, struct file *file)
 		clear_bit(0,&timer_alive);
 
 		printk(KERN_INFO "Wdt977 Watchdog: shutdown\n");
+	} else {
+		printk(KERN_CRIT "WDT device closed unexpectedly.  WDT will not stop!\n");
 	}
 	return 0;
 }
@@ -220,6 +223,21 @@ static ssize_t wdt977_write(struct file *file, const char *buf, size_t count, lo
 
 	if(count)
 	{
+		if (!nowayout) {
+			size_t i;
+
+			/* In case it was set long ago */
+			expect_close = 0;
+
+			for (i = 0; i != len; i++) {
+				char c;
+				if (get_user(c, data + i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_close = 1;
+			}
+		}
+
 		kick_wdog();
 		return 1;
 	}

drivers/char/watchdog/wdt_pci.c

@@ -73,6 +73,7 @@
 #endif
 
 static unsigned long wdt_is_open;
+static int expect_close = 0;
 
 /*
  *	You must set these - there is no sane way to probe for this board.
@@ -276,6 +277,16 @@ static ssize_t wdtpci_write(struct file *file, const char *buf, size_t count, lo
 
 	if(count)
 	{
+		if (!nowayout) {
+			size_t i;
+			for (i = 0; i != count; i++) {
+				char c;
+				if(get_user(c, buf+i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_close = 1;
+			}
+		}
 		wdtpci_ping();
 		return 1;
 	}
@@ -334,7 +345,8 @@ static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd
 	static struct watchdog_info ident = {
 		.options	= WDIOF_OVERHEAT  | WDIOF_POWERUNDER |
 				  WDIOF_POWEROVER | WDIOF_EXTERN1 |
-				    WDIOF_EXTERN2   | WDIOF_FANFAULT,
+				  WDIOF_EXTERN2   | WDIOF_FANFAULT |
+				  WDIOF_SETTIMEOUT|WDIOF_MAGICCLOSE,
 		.firmware_version = 1,
 		.identity	  = "WDT500/501PCI",
 	};

include/linux/watchdog.h

@@ -39,6 +39,7 @@ struct watchdog_info {
 #define	WDIOF_CARDRESET		0x0020	/* Card previously reset the CPU */
 #define WDIOF_POWEROVER		0x0040	/* Power over voltage */
 #define WDIOF_SETTIMEOUT	0x0080  /* Set timeout (in seconds) */
+#define WDIOF_MAGICCLOSE	0x0100	/* Supports magic close char */
 #define	WDIOF_KEEPALIVEPING	0x8000	/* Keep alive ping reply */
 
 #define	WDIOS_DISABLECARD	0x0001	/* Turn off the watchdog timer */