Merge

drivers/char/watchdog/Kconfig

@@ -346,6 +346,18 @@ config ALIM7101_WDT
 	  module, say M here and read <file:Documentation/modules.txt>.  Most
 	  people will say N.
 
+config ALIM1535_WDT
+	tristate "ALi M1535 PMU Watchdog Timer"
+	depends on WATCHDOG
+	---help---
+	  This is the driver for the hardware watchdog on the ALi M1535 PMU.
+
+	  This driver is also available as a module ( = code which can be
+	  inserted in and removed from the running kernel whenever you want).
+	  The module is called alim1535_wdt.  If you want to compile it as a
+	  module, say M here and read <file:Documentation/modules.txt>.  Most
+	  people will say N.
+
 config SC1200_WDT
 	tristate "National Semiconductor PC87307/PC97307 (ala SC1200) Watchdog"
 	depends on WATCHDOG

drivers/char/watchdog/Makefile

@@ -27,6 +27,7 @@ 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-$(CONFIG_ALIM1535_WDT) += alim1535_wdt.o
 obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
 obj-$(CONFIG_WAFER_WDT) += wafer5823wdt.o
 obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o

drivers/char/watchdog/acquirewdt.c

 /*
- *	Acquire Single Board Computer Watchdog Timer driver for Linux 2.1.x
+ *	Acquire Single Board Computer Watchdog Timer driver
  *
  *      Based on wdt.c. Original copyright messages:
  *
@@ -10,10 +10,10 @@
  *	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.	
+ *
+ *	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>
  *
@@ -22,33 +22,39 @@
  *          Can't add timeout - driver doesn't allow changing value
  */
 
-#include <linux/config.h>
 #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/fs.h>
 #include <linux/reboot.h>
 #include <linux/init.h>
-#include <linux/spinlock.h>
 
 #include <asm/io.h>
 #include <asm/uaccess.h>
 #include <asm/system.h>
 
-static int acq_is_open;
-static spinlock_t acq_lock;
-static int expect_close = 0;
+#define WATCHDOG_NAME "Acquire WDT"
+#define PFX WATCHDOG_NAME ": "
+#define WATCHDOG_TIMEOUT 0	/* ??? Is the timeout hardcoded to 1 minute ??? */
+
+static unsigned long acq_is_open;
+static char expect_close;
 
 /*
  *	You must set these - there is no sane way to probe for this board.
  */
- 
-#define WDT_STOP 0x43
-#define WDT_START 0x443
+
+static int wdt_stop = 0x43;
+module_param(wdt_stop, int, 0);
+MODULE_PARM_DESC(wdt_stop, "Acquire WDT 'stop' io port (default 0x43)");
+
+static int wdt_start = 0x443;
+module_param(wdt_start, int, 0);
+MODULE_PARM_DESC(wdt_start, "Acquire WDT 'start' io port (default 0x443)");
 
 #ifdef CONFIG_WATCHDOG_NOWAYOUT
 static int nowayout = 1;
@@ -62,38 +68,52 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CON
 /*
  *	Kernel methods.
  */
- 
 
 static void acq_ping(void)
 {
 	/* Write a watchdog value */
-	inb_p(WDT_START);
+	inb_p(wdt_start);
 }
 
+static void acq_stop(void)
+{
+	/* Turn the card off */
+	inb_p(wdt_stop);
+}
+
+/*
+ *	/dev/watchdog handling.
+ */
+
 static ssize_t acq_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;
 
+	/* See if we got the magic character 'V' and reload the timer */
 	if(count) {
 		if (!nowayout) {
 			size_t i;
 
+			/* note: just in case someone wrote the magic character
+			 * five months ago... */
 			expect_close = 0;
 
+			/* scan to see wether or not we got the magic character */
 			for (i = 0; i != count; i++) {
 				char c;
 				if (get_user(c, buf + i))
 					return -EFAULT;
 				if (c == 'V')
-					expect_close = 1;
+					expect_close = 42;
 			}
 		}
+
+		/* Well, anyhow someone wrote to us, we should return that favour */
 		acq_ping();
-		return 1;
 	}
-	return 0;
+	return count;
 }
 
 static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
@@ -103,65 +123,75 @@ static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 	{
 		.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
 		.firmware_version = 1,
-		.identity = "Acquire WDT"
+		.identity = "Acquire WDT",
 	};
-	
+
 	switch(cmd)
 	{
 	case WDIOC_GETSUPPORT:
-	  if (copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident)))
-	    return -EFAULT;
-	  break;
-	  
+	  return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident)) ? -EFAULT : 0;
+
 	case WDIOC_GETSTATUS:
-	  if (copy_to_user((int *)arg, &acq_is_open,  sizeof(int)))
-	    return -EFAULT;
-	  break;
+	case WDIOC_GETBOOTSTATUS:
+	  return put_user(0, (int *)arg);
 
 	case WDIOC_KEEPALIVE:
 	  acq_ping();
-	  break;
+	  return 0;
+
+	case WDIOC_GETTIMEOUT:
+	  return put_user(WATCHDOG_TIMEOUT, (int *)arg);
+
+	case WDIOC_SETOPTIONS:
+	{
+	    int options, retval = -EINVAL;
+
+	    if (get_user(options, (int *)arg))
+	      return -EFAULT;
+
+	    if (options & WDIOS_DISABLECARD)
+	    {
+	      acq_stop();
+	      retval = 0;
+	    }
+
+	    if (options & WDIOS_ENABLECARD)
+	    {
+	      acq_ping();
+	      retval = 0;
+	    }
+
+	    return retval;
+	}
 
 	default:
-	  return -ENOTTY;
+	  return -ENOIOCTLCMD;
 	}
-	return 0;
 }
 
 static int acq_open(struct inode *inode, struct file *file)
 {
-	if ((iminor(inode) == WATCHDOG_MINOR)) {
-		spin_lock(&acq_lock);
-		if(acq_is_open) {
-			spin_unlock(&acq_lock);
-			return -EBUSY;
-		}
-		if (nowayout)
-			__module_get(THIS_MODULE);
+	if (test_and_set_bit(0, &acq_is_open))
+		return -EBUSY;
 
-		/* Activate */
-		acq_is_open=1;
-		inb_p(WDT_START);      
-		spin_unlock(&acq_lock);
-		return 0;
+	if (nowayout)
+		__module_get(THIS_MODULE);
 
-	} else {
-		return -ENODEV;
-	}
+	/* Activate */
+	acq_ping();
+	return 0;
 }
 
 static int acq_close(struct inode *inode, struct file *file)
 {
-	if(iminor(inode)==WATCHDOG_MINOR) {
-		spin_lock(&acq_lock);
-		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);
+	if (expect_close == 42) {
+		acq_stop();
+	} else {
+		printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+		acq_ping();
 	}
+	clear_bit(0, &acq_is_open);
+	expect_close = 0;
 	return 0;
 }
 
@@ -172,20 +202,20 @@ static int acq_close(struct inode *inode, struct file *file)
 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);
-
+	if(code==SYS_DOWN || code==SYS_HALT) {
+		/* Turn the WDT off */
+		acq_stop();
+	}
 	return NOTIFY_DONE;
 }
- 
+
 /*
  *	Kernel Interfaces
  */
- 
- 
+
 static struct file_operations acq_fops = {
 	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
 	.write		= acq_write,
 	.ioctl		= acq_ioctl,
 	.open		= acq_open,
@@ -196,52 +226,84 @@ static struct miscdevice acq_miscdev=
 {
 	.minor = WATCHDOG_MINOR,
 	.name = "watchdog",
-	.fops = &acq_fops
+	.fops = &acq_fops,
 };
 
-
 /*
  *	The WDT card needs to learn about soft shutdowns in order to
- *	turn the timebomb registers off. 
+ *	turn the timebomb registers off.
  */
- 
+
 static struct notifier_block acq_notifier =
 {
 	.notifier_call = acq_notify_sys,
 	.next = NULL,
-	.priority = 0
+	.priority = 0,
 };
 
 static int __init acq_init(void)
 {
+	int ret;
+
 	printk(KERN_INFO "WDT driver for Acquire single board computer initialising.\n");
 
-	spin_lock_init(&acq_lock);
-	if (misc_register(&acq_miscdev))
-		return -ENODEV;
-	if (!request_region(WDT_STOP, 1, "Acquire WDT")) {
-		misc_deregister(&acq_miscdev);
-		return -EIO;
+	if (wdt_stop != wdt_start) {
+		if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) {
+			printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
+				wdt_stop);
+			ret = -EIO;
+			goto out;
+		}
 	}
-	if (!request_region(WDT_START, 1, "Acquire WDT")) {
-		release_region(WDT_STOP, 1);
-		misc_deregister(&acq_miscdev);
-		return -EIO;
+
+	if (!request_region(wdt_start, 1, WATCHDOG_NAME)) {
+		printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
+			wdt_start);
+		ret = -EIO;
+		goto unreg_stop;
 	}
 
-	register_reboot_notifier(&acq_notifier);
-	return 0;
+        ret = register_reboot_notifier(&acq_notifier);
+        if (ret != 0) {
+                printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+                        ret);
+                goto unreg_regions;
+        }
+                                                                                                 
+        ret = misc_register(&acq_miscdev);
+        if (ret != 0) {
+                printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+                        WATCHDOG_MINOR, ret);
+                goto unreg_reboot;
+        }
+                                                                                                 
+        printk (KERN_INFO PFX "initialized. (nowayout=%d)\n",
+                nowayout);
+                                                                                                 
+out:
+        return ret;
+unreg_reboot:
+        unregister_reboot_notifier(&acq_notifier);
+unreg_regions:
+        release_region(wdt_start, 1);
+unreg_stop:
+        if (wdt_stop != wdt_start)
+                release_region(wdt_stop, 1);
+        goto out;
 }
-	
+
 static void __exit acq_exit(void)
 {
 	misc_deregister(&acq_miscdev);
 	unregister_reboot_notifier(&acq_notifier);
-	release_region(WDT_STOP,1);
-	release_region(WDT_START,1);
+	if(wdt_stop != wdt_start)
+		release_region(wdt_stop,1);
+	release_region(wdt_start,1);
 }
 
 module_init(acq_init);
 module_exit(acq_exit);
 
 MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Unkown");
+MODULE_DESCRIPTION("Acquire Single Board Computer Watchdog Timer driver");

drivers/char/watchdog/advantechwdt.c

@@ -133,7 +133,7 @@ advwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 	static struct watchdog_info ident = {
 		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
 		.firmware_version = 1,
-		.identity = "Advantech WDT"
+		.identity = "Advantech WDT",
 	};
 
 	switch (cmd) {

drivers/char/watchdog/alim1535_wdt.c

+/*
+ *	Watchdog for the 7101 PMU version found in the ALi M1535 chipsets
+ *
+ *	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.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/ioport.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+#define WATCHDOG_NAME "ALi_M1535"
+#define PFX WATCHDOG_NAME ": "
+#define WATCHDOG_TIMEOUT 60	/* 60 sec default timeout */
+
+/* internal variables */
+static unsigned long ali_is_open;
+static char ali_expect_release;
+static struct pci_dev *ali_pci;
+static u32 ali_timeout_bits;	/* stores the computed timeout */
+static spinlock_t ali_lock;	/* Guards the hardware */
+
+/* module parameters */
+static int timeout = WATCHDOG_TIMEOUT;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (0<timeout<18000, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
+/*
+ *	ali_start	-	start watchdog countdown
+ *
+ *	Starts the timer running providing the timer has a counter
+ *	configuration set.
+ */
+
+static void ali_start(void)
+{
+	u32 val;
+
+	spin_lock(&ali_lock);
+
+	pci_read_config_dword(ali_pci, 0xCC, &val);
+	val &= ~0x3F;	/* Mask count */
+	val |= (1<<25) | ali_timeout_bits;
+	pci_write_config_dword(ali_pci, 0xCC, val);
+
+	spin_unlock(&ali_lock);
+}
+
+/*
+ *	ali_stop	-	stop the timer countdown
+ *
+ *	Stop the ALi watchdog countdown
+ */
+
+static void ali_stop(void)
+{
+	u32 val;
+
+	spin_lock(&ali_lock);
+
+	pci_read_config_dword(ali_pci, 0xCC, &val);
+	val &= ~0x3F;	/* Mask count to zero (disabled) */
+	val &= ~(1<<25);/* and for safety mask the reset enable */
+	pci_write_config_dword(ali_pci, 0xCC, val);
+
+	spin_unlock(&ali_lock);
+}
+
+/*
+ *	ali_keepalive	-	send a keepalive to the watchdog
+ *
+ *      Send a keepalive to the timer (actually we restart the timer).
+ */
+
+static void ali_keepalive(void)
+{
+	ali_start();
+}
+
+/*
+ *	ali_settimer	-	compute the timer reload value
+ *	@t: time in seconds
+ *
+ *	Computes the timeout values needed
+ */
+
+static int ali_settimer(int t)
+{
+	if(t < 0)
+		return -EINVAL;
+	else if(t < 60)
+		ali_timeout_bits = t|(1<<6);
+	else if(t < 3600)
+		ali_timeout_bits = (t/60)|(1<<7);
+	else if(t < 18000)
+		ali_timeout_bits = (t/300)|(1<<6)|(1<<7);
+	else return -EINVAL;
+
+	timeout = t;
+	return 0;
+}
+
+/*
+ *	/dev/watchdog handling
+ */
+
+/*
+ *	ali_write	-	writes to ALi watchdog
+ *	@file: file from VFS
+ *	@data: user address of data
+ *	@len: length of data
+ *	@ppos: pointer to the file offset
+ *
+ *	Handle a write to the ALi watchdog. Writing to the file pings
+ *	the watchdog and resets it. Writing the magic 'V' sequence allows
+ *	the next close to turn off the watchdog.
+ */
+
+static ssize_t ali_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;
+
+	/* See if we got the magic character 'V' and reload the timer */
+	if (len) {
+		if (!nowayout) {
+			size_t i;
+
+			/* note: just in case someone wrote the magic character
+			 * five months ago... */
+			ali_expect_release = 0;
+
+			/* scan to see wether or not we got the magic character */
+			for (i = 0; i != len; i++) {
+				char c;
+				if(get_user(c, data+i))
+					return -EFAULT;
+				if (c == 'V')
+					ali_expect_release = 42;
+			}
+		}
+
+		/* someone wrote to us, we should reload the timer */
+		ali_start();
+	}
+	return len;
+}
+
+/*
+ *	ali_ioctl	-	handle watchdog ioctls
+ *	@inode: VFS inode
+ *	@file: VFS file pointer
+ *	@cmd: ioctl number
+ *	@arg: arguments to the ioctl
+ *
+ *	Handle the watchdog ioctls supported by the ALi driver. Really
+ *	we want an extension to enable irq ack monitoring and the like
+ */
+
+static int ali_ioctl(struct inode *inode, struct file *file,
+			  unsigned int cmd, unsigned long arg)
+{
+	static struct watchdog_info ident = {
+		.options =		WDIOF_KEEPALIVEPING |
+					WDIOF_SETTIMEOUT |
+					WDIOF_MAGICCLOSE,
+		.firmware_version =	0,
+		.identity =		"ALi M1535 WatchDog Timer",
+	};
+
+	switch (cmd) {
+		case WDIOC_GETSUPPORT:
+			return copy_to_user((struct watchdog_info *) arg, &ident,
+				sizeof (ident)) ? -EFAULT : 0;
+
+		case WDIOC_GETSTATUS:
+		case WDIOC_GETBOOTSTATUS:
+			return put_user(0, (int *) arg);
+
+		case WDIOC_KEEPALIVE:
+			ali_keepalive();
+			return 0;
+
+		case WDIOC_SETOPTIONS:
+		{
+			int new_options, retval = -EINVAL;
+
+			if (get_user (new_options, (int *) arg))
+				return -EFAULT;
+
+			if (new_options & WDIOS_DISABLECARD) {
+				ali_stop();
+				retval = 0;
+			}
+
+			if (new_options & WDIOS_ENABLECARD) {
+				ali_start();
+				retval = 0;
+			}
+
+			return retval;
+		}
+
+		case WDIOC_SETTIMEOUT:
+		{
+			int new_timeout;
+
+			if (get_user(new_timeout, (int *) arg))
+				return -EFAULT;
+
+			if (ali_settimer(new_timeout))
+			    return -EINVAL;
+
+			ali_keepalive();
+			/* Fall */
+		}
+
+		case WDIOC_GETTIMEOUT:
+			return put_user(timeout, (int *)arg);
+
+		default:
+			return -ENOIOCTLCMD;
+	}
+}
+
+/*
+ *	ali_open	-	handle open of ali watchdog
+ *	@inode: inode from VFS
+ *	@file: file from VFS
+ *
+ *	Open the ALi watchdog device. Ensure only one person opens it
+ *	at a time. Also start the watchdog running.
+ */
+
+static int ali_open(struct inode *inode, struct file *file)
+{
+	/* /dev/watchdog can only be opened once */
+	if (test_and_set_bit(0, &ali_is_open))
+		return -EBUSY;
+
+	/* Activate */
+	ali_start();
+	return 0;
+}
+
+/*
+ *	ali_release	-	close an ALi watchdog
+ *	@inode: inode from VFS
+ *	@file: file from VFS
+ *
+ *	Close the ALi watchdog device. Actual shutdown of the timer
+ *	only occurs if the magic sequence has been set.
+ */
+
+static int ali_release(struct inode *inode, struct file *file)
+{
+	/*
+	 *      Shut off the timer.
+	 */
+	if (ali_expect_release == 42) {
+		ali_stop();
+	} else {
+		printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+		ali_keepalive();
+	}
+	clear_bit(0, &ali_is_open);
+	ali_expect_release = 0;
+	return 0;
+}
+
+/*
+ *	ali_notify_sys	-	System down notifier
+ *
+ *	Notifier for system down
+ */
+
+
+static int ali_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
+{
+	if (code==SYS_DOWN || code==SYS_HALT) {
+		/* Turn the WDT off */
+		ali_stop();
+	}
+
+	return NOTIFY_DONE;
+}
+
+/*
+ *	Data for PCI driver interface
+ *
+ *	This data only exists for exporting the supported
+ *	PCI ids via MODULE_DEVICE_TABLE.  We do not actually
+ *	register a pci_driver, because someone else might one day
+ *	want to register another driver on the same PCI id.
+ */
+
+static struct pci_device_id ali_pci_tbl[] __initdata = {
+	{ PCI_VENDOR_ID_AL, 1535, PCI_ANY_ID, PCI_ANY_ID,},
+	{ 0, },
+};
+MODULE_DEVICE_TABLE(pci, ali_pci_tbl);
+
+/*
+ *	ali_find_watchdog	-	find a 1535 and 7101
+ *
+ *	Scans the PCI hardware for a 1535 series bridge and matching 7101
+ *	watchdog device. This may be overtight but it is better to be safe
+ */
+
+static int __init ali_find_watchdog(void)
+{
+	struct pci_dev *pdev;
+	u32 wdog;
+
+	/* Check for a 1535 series bridge */
+	pdev = pci_find_device(PCI_VENDOR_ID_AL, 0x1535, NULL);
+	if(pdev == NULL)
+		return -ENODEV;
+
+	/* Check for the a 7101 PMU */
+	pdev = pci_find_device(PCI_VENDOR_ID_AL, 0x7101, NULL);
+	if(pdev == NULL)
+		return -ENODEV;
+
+	if(pci_enable_device(pdev))
+		return -EIO;
+
+	ali_pci = pdev;
+
+	/*
+	 *	Initialize the timer bits
+	 */
+	pci_read_config_dword(pdev, 0xCC, &wdog);
+
+	wdog &= ~0x3F;		/* Timer bits */
+	wdog &= ~((1<<27)|(1<<26)|(1<<25)|(1<<24));	/* Issued events */
+	wdog &= ~((1<<16)|(1<<13)|(1<<12)|(1<<11)|(1<<10)|(1<<9));	/* No monitor bits */
+
+	pci_write_config_dword(pdev, 0xCC, wdog);
+
+	return 0;
+}
+
+/*
+ *	Kernel Interfaces
+ */
+
+static struct file_operations ali_fops = {
+	.owner =	THIS_MODULE,
+	.llseek =	no_llseek,
+	.write =	ali_write,
+	.ioctl =	ali_ioctl,
+	.open =		ali_open,
+	.release =	ali_release,
+};
+
+static struct miscdevice ali_miscdev = {
+	.minor =	WATCHDOG_MINOR,
+	.name =		"watchdog",
+	.fops =		&ali_fops,
+};
+
+static struct notifier_block ali_notifier = {
+	.notifier_call =	ali_notify_sys,
+	.next =			NULL,
+	.priority =		0,
+};
+
+/*
+ *	watchdog_init	-	module initialiser
+ *
+ *	Scan for a suitable watchdog and if so initialize it. Return an error
+ *	if we cannot, the error causes the module to unload
+ */
+
+static int __init watchdog_init(void)
+{
+	int ret;
+
+	spin_lock_init(&ali_lock);
+
+	/* Check wether or not the hardware watchdog is there */
+	if (ali_find_watchdog() != 0) {
+		return -ENODEV;
+	}
+
+	/* Check that the timeout value is within it's range ; if not reset to the default */
+	if (timeout < 1 || timeout >= 18000) {
+		timeout = WATCHDOG_TIMEOUT;
+		printk(KERN_INFO PFX "timeout value must be 0<timeout<18000, using %d\n",
+			timeout);
+	}
+
+	/* Calculate the watchdog's timeout */
+	ali_settimer(timeout);
+
+	ret = misc_register(&ali_miscdev);
+	if (ret != 0) {
+		printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+			WATCHDOG_MINOR, ret);
+		goto out;
+	}
+
+	ret = register_reboot_notifier(&ali_notifier);
+	if (ret != 0) {
+		printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+			ret);
+		goto unreg_miscdev;
+	}
+
+	printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
+		timeout, nowayout);
+
+out:
+	return ret;
+unreg_miscdev:
+	misc_deregister(&ali_miscdev);
+	goto out;
+}
+
+/*
+ *	watchdog_exit	-	module de-initialiser
+ *
+ *	Called while unloading a successfully installed watchdog module.
+ */
+
+static void __exit watchdog_exit(void)
+{
+	/* Stop the timer before we leave */
+	ali_stop();
+
+	/* Deregister */
+	unregister_reboot_notifier(&ali_notifier);
+	misc_deregister(&ali_miscdev);
+}
+
+module_init(watchdog_init);
+module_exit(watchdog_exit);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("ALi M1535 PMU Watchdog Timer driver");
+MODULE_LICENSE("GPL");

drivers/char/watchdog/wafer5823wdt.c

 /*
- *	ICP Wafer 5823 Single Board Computer WDT driver for Linux 2.4.x
+ *	ICP Wafer 5823 Single Board Computer WDT driver
  *      http://www.icpamerica.com/wafer_5823.php
  *      May also work on other similar models
  *
@@ -17,10 +17,10 @@
  *	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.	
+ *
+ *	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>
  *
@@ -39,9 +39,13 @@
 #include <asm/io.h>
 #include <asm/uaccess.h>
 
+#define WATCHDOG_NAME "Wafer 5823 WDT"
+#define PFX WATCHDOG_NAME ": "
+#define WD_TIMO 60			/* 60 sec default timeout */
+
 static unsigned long wafwdt_is_open;
+static char expect_close;
 static spinlock_t wafwdt_lock;
-static int expect_close = 0;
 
 /*
  *	You must set these - there is no sane way to probe for this board.
@@ -52,11 +56,17 @@ static int expect_close = 0;
  *      to restart it again.
  */
 
-#define WDT_START 0x443
-#define WDT_STOP 0x843
+static int wdt_stop = 0x843;
+module_param(wdt_stop, int, 0);
+MODULE_PARM_DESC(wdt_stop, "Wafer 5823 WDT 'stop' io port (default 0x843)");
+
+static int wdt_start = 0x443;
+module_param(wdt_start, int, 0);
+MODULE_PARM_DESC(wdt_start, "Wafer 5823 WDT 'start' io port (default 0x443)");
 
-#define WD_TIMO 60		/* 1 minute */
-static int wd_margin = WD_TIMO;
+static int timeout = WD_TIMO;  /* in seconds */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=255, default=" __MODULE_STRING(WD_TIMO) ".");
 
 #ifdef CONFIG_WATCHDOG_NOWAYOUT
 static int nowayout = 1;
@@ -70,24 +80,24 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CON
 static void wafwdt_ping(void)
 {
 	/* pat watchdog */
-        spin_lock(&wafwdt_lock);
-	inb_p(WDT_STOP);
-	inb_p(WDT_START);
-        spin_unlock(&wafwdt_lock);
+	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);
+	outb_p(timeout, wdt_start);
+	inb_p(wdt_start);
 }
 
 static void
 wafwdt_stop(void)
 {
 	/* stop watchdog */
-	inb_p(WDT_STOP);
+	inb_p(wdt_stop);
 }
 
 static ssize_t wafwdt_write(struct file *file, const char *buf, size_t count, loff_t * ppos)
@@ -96,6 +106,7 @@ static ssize_t wafwdt_write(struct file *file, const char *buf, size_t count, lo
 	if (ppos != &file->f_pos)
 		return -ESPIPE;
 
+	/* See if we got the magic character 'V' and reload the timer */
 	if (count) {
 		if (!nowayout) {
 			size_t i;
@@ -103,30 +114,30 @@ static ssize_t wafwdt_write(struct file *file, const char *buf, size_t count, lo
 			/* In case it was set long ago */
 			expect_close = 0;
 
+			/* scan to see wether or not we got the magic character */
 			for (i = 0; i != count; i++) {
 				char c;
 				if (get_user(c, buf + i))
 					return -EFAULT;
 				if (c == 'V')
-					expect_close = 1;
+					expect_close = 42;
 			}
 		}
+		/* Well, anyhow someone wrote to us, we should return that favour */
 		wafwdt_ping();
-		return 1;
 	}
-	return 0;
+	return count;
 }
 
 static int wafwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 	     unsigned long arg)
 {
-	int new_margin;
+	int new_timeout;
 	static struct watchdog_info ident = {
 		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
 		.firmware_version = 1,
-		.identity = "Wafer 5823 WDT"
+		.identity = "Wafer 5823 WDT",
 	};
-	int one=1;
 
 	switch (cmd) {
 	case WDIOC_GETSUPPORT:
@@ -136,25 +147,44 @@ static int wafwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd
 		break;
 
 	case WDIOC_GETSTATUS:
-		if (copy_to_user((int *) arg, &one, sizeof (int)))
-			return -EFAULT;
-		break;
+	case WDIOC_GETBOOTSTATUS:
+		return put_user(0, (int *)arg);
 
 	case WDIOC_KEEPALIVE:
 		wafwdt_ping();
 		break;
 
 	case WDIOC_SETTIMEOUT:
-		if (get_user(new_margin, (int *)arg))
+		if (get_user(new_timeout, (int *)arg))
 			return -EFAULT;
-		if ((new_margin < 1) || (new_margin > 255))
+		if ((new_timeout < 1) || (new_timeout > 255))
 			return -EINVAL;
-		wd_margin = new_margin;
+		timeout = new_timeout;
 		wafwdt_stop();
 		wafwdt_start();
 		/* Fall */
 	case WDIOC_GETTIMEOUT:
-		return put_user(wd_margin, (int *)arg);
+		return put_user(timeout, (int *)arg);
+
+	case WDIOC_SETOPTIONS:
+	{
+		int options, retval = -EINVAL;
+
+		if (get_user(options, (int *)arg))
+			return -EFAULT;
+
+		if (options & WDIOS_DISABLECARD) {
+			wafwdt_start();
+			retval = 0;
+		}
+
+		if (options & WDIOS_ENABLECARD) {
+			wafwdt_stop();
+			retval = 0;
+		}
+
+		return retval;
+	}
 
 	default:
 		return -ENOTTY;
@@ -166,6 +196,10 @@ static int wafwdt_open(struct inode *inode, struct file *file)
 {
 	if (test_and_set_bit(0, &wafwdt_is_open))
 		return -EBUSY;
+
+	/*
+	 *      Activate
+	 */
 	wafwdt_start();
 	return 0;
 }
@@ -173,12 +207,14 @@ static int wafwdt_open(struct inode *inode, struct file *file)
 static int
 wafwdt_close(struct inode *inode, struct file *file)
 {
-	clear_bit(0, &wafwdt_is_open);
-	if (expect_close) {   
+	if (expect_close == 42) {
 		wafwdt_stop();
 	} else {
-		printk(KERN_CRIT "WDT device closed unexpectedly.  WDT will not stop!\n");
+		printk(KERN_CRIT PFX "WDT device closed unexpectedly.  WDT will not stop!\n");
+		wafwdt_ping();
 	}
+	clear_bit(0, &wafwdt_is_open);
+	expect_close = 0;
 	return 0;
 }
 
@@ -201,6 +237,7 @@ static int wafwdt_notify_sys(struct notifier_block *this, unsigned long code, vo
 
 static struct file_operations wafwdt_fops = {
 	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
 	.write		= wafwdt_write,
 	.ioctl		= wafwdt_ioctl,
 	.open		= wafwdt_open,
@@ -210,53 +247,93 @@ static struct file_operations wafwdt_fops = {
 static struct miscdevice wafwdt_miscdev = {
 	.minor	= WATCHDOG_MINOR,
 	.name	= "watchdog",
-	.fops	= &wafwdt_fops
+	.fops	= &wafwdt_fops,
 };
 
 /*
  *	The WDT needs to learn about soft shutdowns in order to
- *	turn the timebomb registers off. 
+ *	turn the timebomb registers off.
  */
 
 static struct notifier_block wafwdt_notifier = {
 	.notifier_call = wafwdt_notify_sys,
 	.next = NULL,
-	.priority = 0
+	.priority = 0,
 };
 
 static int __init wafwdt_init(void)
 {
+	int ret;
+
 	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"))
+
+	if (timeout < 1 || timeout > 63) {
+		timeout = WD_TIMO;
+		printk (KERN_INFO PFX "timeout value must be 1<=x<=255, using %d\n",
+			timeout);
+	}
+
+	if (wdt_stop != wdt_start) {
+		if(!request_region(wdt_stop, 1, "Wafer 5823 WDT")) {
+			printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
+			wdt_stop);
+			ret = -EIO;
+			goto error;
+		}
+	}
+
+	if(!request_region(wdt_start, 1, "Wafer 5823 WDT")) {
+		printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
+			wdt_start);
+		ret = -EIO;
 		goto error2;
-	if(misc_register(&wafwdt_miscdev)<0)
+	}
+
+	ret = register_reboot_notifier(&wafwdt_notifier);
+	if (ret != 0) {
+		printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+			ret);
 		goto error3;
-	register_reboot_notifier(&wafwdt_notifier);
-	return 0;
+	}
+
+	ret = misc_register(&wafwdt_miscdev);
+	if (ret != 0) {
+		printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+			WATCHDOG_MINOR, ret);
+		goto error4;
+	}
+
+	printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
+		timeout, nowayout);
+
+	return ret;
+error4:
+	unregister_reboot_notifier(&wafwdt_notifier);
 error3:
-	release_region(WDT_START, 1);
+	release_region(wdt_start, 1);
 error2:
-	release_region(WDT_STOP, 1);
+	if (wdt_stop != wdt_start)
+		release_region(wdt_stop, 1);
 error:
-	return -ENODEV;
+	return ret;
 }
 
 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);
+	if(wdt_stop != wdt_start)
+		release_region(wdt_stop, 1);
+	release_region(wdt_start, 1);
 }
 
 module_init(wafwdt_init);
 module_exit(wafwdt_exit);
 
 MODULE_AUTHOR("Justin Cormack");
+MODULE_DESCRIPTION("ICP Wafer 5823 Single Board Computer WDT driver");
 MODULE_LICENSE("GPL");
 
 /* end of wafer5823wdt.c */