[PATCH] watchdog updates

From: Wim Van Sebroeck <wim@iguana.be>

<wim@iguana.be> (04/02/29 1.1628)
   [WATCHDOG] v2.6.3 pcwd_usb-watchdog

   Add the Berkshire Products USB-PC Watchdog driver

<wim@iguana.be> (04/02/29 1.1629)
   [WATCHDOG] v2.6.3 MODULE_*-patch

   Add MODULE_* info

<wim@iguana.be> (04/02/29 1.1630)
   [WATCHDOG/SPARC64] v2.6.3 Kconfig-WATCHDOG_CP1XXX/WATCHDOG_RIO-patch

   Move WATCHDOG_CP1XXX and WATCHDOG_RIO for SPARC64 architecture
   from arch/sparc64/Kconfig to drivers/char/watchdog/Kconfig
   and made them dependant of WATCHDOG also

arch/sparc64/Kconfig

@@ -450,28 +450,6 @@ config DISPLAY7SEG
 	  another UltraSPARC-IIi-cEngine boardset with a 7-segment display,
 	  you should say N to this option.
 
-config WATCHDOG_CP1XXX
-	tristate "CP1XXX Hardware Watchdog support"
-	depends on PCI
-	---help---
-	  This is the driver for the hardware watchdog timers present on
-	  Sun Microsystems CompactPCI models CP1400 and CP1500.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called cpwatchdog.
-
-	  If you do not have a CompactPCI model CP1400 or CP1500, or
-	  another UltraSPARC-IIi-cEngine boardset with hardware watchdog,
-	  you should say N to this option.
-
-config WATCHDOG_RIO
-	tristate "RIO Hardware Watchdog support"
-	depends on PCI
-	help
-	  Say Y here to support the hardware watchdog capability on Sun RIO
-	  machines.  The watchdog timeout period is normally one minute but
-	  can be changed with a boot-time parameter.
-
 config CMDLINE_BOOL
 	bool "Default bootloader kernel arguments"
 

drivers/char/watchdog/Kconfig

@@ -339,6 +339,30 @@ config SH_WDT
 	  To compile this driver as a module, choose M here: the
 	  module will be called shwdt.
 
+# SPARC64 Architecture
+
+config WATCHDOG_CP1XXX
+	tristate "CP1XXX Hardware Watchdog support"
+	depends on WATCHDOG && SPARC64 && PCI
+	---help---
+	  This is the driver for the hardware watchdog timers present on
+	  Sun Microsystems CompactPCI models CP1400 and CP1500.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called cpwatchdog.
+
+	  If you do not have a CompactPCI model CP1400 or CP1500, or
+	  another UltraSPARC-IIi-cEngine boardset with hardware watchdog,
+	  you should say N to this option.
+
+config WATCHDOG_RIO
+	tristate "RIO Hardware Watchdog support"
+	depends on WATCHDOG && SPARC64 && PCI
+	help
+	  Say Y here to support the hardware watchdog capability on Sun RIO
+	  machines.  The watchdog timeout period is normally one minute but
+	  can be changed with a boot-time parameter.
+
 #
 # ISA-based Watchdog Cards
 #
@@ -455,4 +479,26 @@ config WDT_501_PCI
 	  Fahrenheit. This works only if you have a WDT501P watchdog board
 	  installed.
 
+#
+# USB-based Watchdog Cards
+#
+
+comment "USB-based Watchdog Cards"
+	depends on WATCHDOG && USB
+
+config USBPCWATCHDOG
+	tristate "Berkshire Products USB-PC Watchdog"
+	depends on WATCHDOG && USB
+	---help---
+	  This is the driver for the Berkshire Products USB-PC Watchdog card.
+	  This card 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. The card can also monitor the internal temperature of the PC.
+	  More info is available at <http://www.berkprod.com/usb_pc_watchdog.htm>.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called pcwd_usb.
+
+	  Most people will say N.
+
 endmenu

drivers/char/watchdog/Makefile

 #
-# Makefile for the kernel character device drivers.
+# Makefile for the WatchDog device drivers.
 #
 
 # Only one watchdog can succeed. We probe the hardware watchdog
@@ -35,3 +35,4 @@ obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o
 obj-$(CONFIG_AMD7XX_TCO) += amd7xx_tco.o
 obj-$(CONFIG_INDYDOG) += indydog.o
 obj-$(CONFIG_PCIPCWATCHDOG) += pcwd_pci.o
+obj-$(CONFIG_USBPCWATCHDOG) += pcwd_usb.o

drivers/char/watchdog/cpu5wdt.c

@@ -293,6 +293,7 @@ MODULE_AUTHOR("Heiko Ronsdorf <hero@ihg.uni-duisburg.de>");
 MODULE_DESCRIPTION("sma cpu5 watchdog driver");
 MODULE_SUPPORTED_DEVICE("sma cpu5 watchdog");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 
 MODULE_PARM(port, "i");
 MODULE_PARM_DESC(port, "base address of watchdog card, default is 0x91");

drivers/char/watchdog/eurotechwdt.c

@@ -503,3 +503,4 @@ module_exit(eurwdt_exit);
 MODULE_AUTHOR("Rodolfo Giometti");
 MODULE_DESCRIPTION("Driver for Eurotech CPU-1220/1410 on board watchdog");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/char/watchdog/ib700wdt.c

@@ -350,5 +350,6 @@ module_exit(ibwdt_exit);
 MODULE_AUTHOR("Charles Howes <chowes@vsol.net>");
 MODULE_DESCRIPTION("IB700 SBC watchdog driver");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 
 /* end of ib700wdt.c */

drivers/char/watchdog/machzwd.c

@@ -98,6 +98,7 @@ static unsigned short zf_readb(unsigned char port)
 MODULE_AUTHOR("Fernando Fuganti <fuganti@conectiva.com.br>");
 MODULE_DESCRIPTION("MachZ ZF-Logic Watchdog driver");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 
 #ifdef CONFIG_WATCHDOG_NOWAYOUT
 static int nowayout = 1;

drivers/char/watchdog/mixcomwd.c

@@ -302,4 +302,7 @@ static void __exit mixcomwd_exit(void)
 module_init(mixcomwd_init);
 module_exit(mixcomwd_exit);
 
+MODULE_AUTHOR("Gergely Madarasz <gorgo@itc.hu>");
+MODULE_DESCRIPTION("MixCom Watchdog driver");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/char/watchdog/pcwd.c

@@ -705,5 +705,8 @@ static void __exit pcwatchdog_exit(void)
 module_init(pcwatchdog_init);
 module_exit(pcwatchdog_exit);
 
+MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>");
+MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver");
 MODULE_LICENSE("GPL");
-
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS_MISCDEV(TEMP_MINOR);

drivers/char/watchdog/pcwd_usb.c

+/*
+ *	Berkshire USB-PC Watchdog Card Driver
+ *
+ *	(c) Copyright 2004 Wim Van Sebroeck <wim@iguana.be>.
+ *
+ *	Based on source code of the following authors:
+ *	  Ken Hollis <kenji@bitgate.com>,
+ *	  Alan Cox <alan@redhat.com>,
+ *	  Matt Domsch <Matt_Domsch@dell.com>,
+ *	  Rob Radez <rob@osinvestor.com>,
+ *	  Greg Kroah-Hartman <greg@kroah.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 Wim Van Sebroeck nor Iguana vzw. admit liability nor
+ *	provide warranty for any of this software. This material is
+ *	provided "AS-IS" and at no charge.
+ *
+ *	Thanks also to Simon Machell at Berkshire Products Inc. for
+ *	providing the test hardware. More info is available at
+ *	http://www.berkprod.com/ or http://www.pcwatchdog.com/
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/fs.h>
+#include <linux/smp_lock.h>
+#include <linux/completion.h>
+#include <asm/uaccess.h>
+#include <linux/usb.h>
+
+
+#ifdef CONFIG_USB_DEBUG
+	static int debug = 1;
+#else
+	static int debug;
+#endif
+
+/* Use our own dbg macro */
+#undef dbg
+#define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0)
+
+
+/* Module and Version Information */
+#define DRIVER_VERSION "v1.00 (28/02/2004)"
+#define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>"
+#define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
+#define DRIVER_LICENSE "GPL"
+#define DRIVER_NAME "pcwd_usb"
+#define PFX DRIVER_NAME ": "
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE(DRIVER_LICENSE);
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS_MISCDEV(TEMP_MINOR);
+
+/* Module Parameters */
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+
+#define WATCHDOG_HEARTBEAT 2	/* 2 sec default heartbeat */
+static int heartbeat = WATCHDOG_HEARTBEAT;
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
+
+#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)");
+
+/* The vendor and product id's for the USB-PC Watchdog card */
+#define USB_PCWD_VENDOR_ID	0x0c98
+#define USB_PCWD_PRODUCT_ID	0x1140
+
+/* table of devices that work with this driver */
+static struct usb_device_id usb_pcwd_table [] = {
+	{ USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
+	{ }					/* Terminating entry */
+};
+MODULE_DEVICE_TABLE (usb, usb_pcwd_table);
+
+/* according to documentation max. time to process a command for the USB
+ * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
+#define USB_COMMAND_TIMEOUT	250
+
+/* Watchdog's internal commands */
+#define CMD_READ_TEMP			0x02	/* Read Temperature; Re-trigger Watchdog */
+#define CMD_TRIGGER			CMD_READ_TEMP
+#define CMD_GET_STATUS			0x04	/* Get Status Information */
+#define CMD_GET_FIRMWARE_VERSION	0x08	/* Get Firmware Version */
+#define CMD_GET_DIP_SWITCH_SETTINGS	0x0c	/* Get Dip Switch Settings */
+#define CMD_READ_WATCHDOG_TIMEOUT	0x18	/* Read Current Watchdog Time */
+#define CMD_WRITE_WATCHDOG_TIMEOUT	0x19	/* Write Current Watchdog Time */
+#define CMD_ENABLE_WATCHDOG		0x30	/* Enable / Disable Watchdog */
+#define CMD_DISABLE_WATCHDOG		CMD_ENABLE_WATCHDOG
+
+/* Some defines that I like to be somewhere else like include/linux/usb_hid.h */
+#define HID_REQ_SET_REPORT		0x09
+#define HID_DT_REPORT			(USB_TYPE_CLASS | 0x02)
+
+/* We can only use 1 card due to the /dev/watchdog restriction */
+static int cards_found;
+
+/* some internal variables */
+static unsigned long is_active;
+static char expect_release;
+
+/* Structure to hold all of our device specific stuff */
+struct usb_pcwd_private {
+	struct usb_device *	udev;			/* save off the usb device pointer */
+	struct usb_interface *	interface;		/* the interface for this device */
+
+	unsigned int		interface_number;	/* the interface number used for cmd's */
+
+	unsigned char *		intr_buffer;		/* the buffer to intr data */
+	dma_addr_t		intr_dma;		/* the dma address for the intr buffer */
+	size_t			intr_size;		/* the size of the intr buffer */
+	struct urb *		intr_urb;		/* the urb used for the intr pipe */
+
+	unsigned char		cmd_command;		/* The command that is reported back */
+	unsigned char		cmd_data_msb;		/* The data MSB that is reported back */
+	unsigned char		cmd_data_lsb;		/* The data LSB that is reported back */
+	atomic_t		cmd_received;		/* true if we received a report after a command */
+
+	int			exists;			/* Wether or not the device exists */
+	struct semaphore	sem;			/* locks this structure */
+};
+static struct usb_pcwd_private *usb_pcwd_device;
+
+/* prevent races between open() and disconnect() */
+static DECLARE_MUTEX (disconnect_sem);
+
+/* local function prototypes */
+static int usb_pcwd_probe	(struct usb_interface *interface, const struct usb_device_id *id);
+static void usb_pcwd_disconnect	(struct usb_interface *interface);
+
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver usb_pcwd_driver = {
+	.owner =	THIS_MODULE,
+	.name =		DRIVER_NAME,
+	.probe =	usb_pcwd_probe,
+	.disconnect =	usb_pcwd_disconnect,
+	.id_table =	usb_pcwd_table,
+};
+
+
+static void usb_pcwd_intr_done(struct urb *urb, struct pt_regs *regs)
+{
+	struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context;
+	unsigned char *data = usb_pcwd->intr_buffer;
+	int retval;
+
+	switch (urb->status) {
+	case 0:			/* success */
+		break;
+	case -ECONNRESET:	/* unlink */
+	case -ENOENT:
+	case -ESHUTDOWN:
+		/* this urb is terminated, clean up */
+		dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
+		return;
+	/* -EPIPE:  should clear the halt */
+	default:		/* error */
+		dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
+		goto resubmit;
+	}
+
+	dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
+		data[0], data[1], data[2]);
+
+	usb_pcwd->cmd_command  = data[0];
+	usb_pcwd->cmd_data_msb = data[1];
+	usb_pcwd->cmd_data_lsb = data[2];
+
+	/* notify anyone waiting that the cmd has finished */
+	atomic_set (&usb_pcwd->cmd_received, 1);
+
+resubmit:
+	retval = usb_submit_urb (urb, GFP_ATOMIC);
+	if (retval)
+		printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n",
+			retval);
+}
+
+static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd,
+	unsigned char *msb, unsigned char *lsb)
+{
+	int got_response, count;
+	unsigned char buf[6];
+
+	/* We will not send any commands if the USB PCWD device does not exist */
+	if ((!usb_pcwd) || (!usb_pcwd->exists))
+		return -1;
+
+	/* The USB PC Watchdog uses a 6 byte report format. The board currently uses
+	 * only 3 of the six bytes of the report. */
+	buf[0] = cmd;			/* Byte 0 = CMD */
+	buf[1] = *msb;			/* Byte 1 = Data MSB */
+	buf[2] = *lsb;			/* Byte 2 = Data LSB */
+	buf[3] = buf[4] = buf[5] = 0;	/* All other bytes not used */
+
+	dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
+		buf[0], buf[1], buf[2]);
+
+	atomic_set (&usb_pcwd->cmd_received, 0);
+
+	if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
+			HID_REQ_SET_REPORT, HID_DT_REPORT,
+			0x0200, usb_pcwd->interface_number, buf, sizeof(buf),
+			HZ) != sizeof(buf)) {
+		dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb);
+	}
+	/* wait till the usb card processed the command,
+	 * with a max. timeout of USB_COMMAND_TIMEOUT */
+	got_response = 0;
+	for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) {
+		mdelay(1);
+		if (atomic_read (&usb_pcwd->cmd_received))
+			got_response = 1;
+	}
+
+	if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
+		/* read back response */
+		*msb = usb_pcwd->cmd_data_msb;
+		*lsb = usb_pcwd->cmd_data_lsb;
+	}
+
+	return got_response;
+}
+
+static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
+{
+	unsigned char msb = 0x00;
+	unsigned char lsb = 0x00;
+	int retval;
+
+	/* Enable Watchdog */
+	retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb);
+
+	if ((retval == 0) || (lsb == 0)) {
+		printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
+{
+	unsigned char msb = 0xA5;
+	unsigned char lsb = 0xC3;
+	int retval;
+
+	/* Disable Watchdog */
+	retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb);
+
+	if ((retval == 0) || (lsb != 0)) {
+		printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
+{
+	unsigned char dummy;
+
+	/* Re-trigger Watchdog */
+	usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
+
+	return 0;
+}
+
+static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
+{
+	unsigned char msb = t / 256;
+	unsigned char lsb = t % 256;
+
+	if ((t < 0x0001) || (t > 0xFFFF))
+		return -EINVAL;
+
+	/* Write new heartbeat to watchdog */
+	usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
+
+	heartbeat = t;
+	return 0;
+}
+
+static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature)
+{
+	unsigned char msb, lsb;
+
+	usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
+
+	/*
+	 * Convert celsius to fahrenheit, since this was
+	 * the decided 'standard' for this return value.
+	 */
+	*temperature = (lsb * 9 / 5) + 32;
+
+	return 0;
+}
+
+/*
+ *	/dev/watchdog handling
+ */
+
+static ssize_t usb_pcwd_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... */
+			expect_release = 0;
+
+			/* scan to see whether or not we got the magic character */
+			for (i = 0; i != len; i++) {
+				char c;
+				if(get_user(c, data+i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_release = 42;
+			}
+		}
+
+		/* someone wrote to us, we should reload the timer */
+		usb_pcwd_keepalive(usb_pcwd_device);
+	}
+	return len;
+}
+
+static int usb_pcwd_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 =	1,
+		.identity =		DRIVER_NAME,
+	};
+
+	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_GETTEMP:
+		{
+			int temperature;
+
+			if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
+				return -EFAULT;
+
+			return put_user(temperature, (int *) arg);
+		}
+
+		case WDIOC_KEEPALIVE:
+			usb_pcwd_keepalive(usb_pcwd_device);
+			return 0;
+
+		case WDIOC_SETOPTIONS:
+		{
+			int new_options, retval = -EINVAL;
+
+			if (get_user (new_options, (int *) arg))
+				return -EFAULT;
+
+			if (new_options & WDIOS_DISABLECARD) {
+				usb_pcwd_stop(usb_pcwd_device);
+				retval = 0;
+			}
+
+			if (new_options & WDIOS_ENABLECARD) {
+				usb_pcwd_start(usb_pcwd_device);
+				retval = 0;
+			}
+
+			return retval;
+		}
+
+		case WDIOC_SETTIMEOUT:
+		{
+			int new_heartbeat;
+
+			if (get_user(new_heartbeat, (int *) arg))
+				return -EFAULT;
+
+			if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
+			    return -EINVAL;
+
+			usb_pcwd_keepalive(usb_pcwd_device);
+			/* Fall */
+		}
+
+		case WDIOC_GETTIMEOUT:
+			return put_user(heartbeat, (int *)arg);
+
+		default:
+			return -ENOIOCTLCMD;
+	}
+}
+
+static int usb_pcwd_open(struct inode *inode, struct file *file)
+{
+	/* /dev/watchdog can only be opened once */
+	if (test_and_set_bit(0, &is_active))
+		return -EBUSY;
+
+	/* Activate */
+	usb_pcwd_start(usb_pcwd_device);
+	usb_pcwd_keepalive(usb_pcwd_device);
+	return 0;
+}
+
+static int usb_pcwd_release(struct inode *inode, struct file *file)
+{
+	/*
+	 *      Shut off the timer.
+	 */
+	if (expect_release == 42) {
+		usb_pcwd_stop(usb_pcwd_device);
+	} else {
+		printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+		usb_pcwd_keepalive(usb_pcwd_device);
+	}
+	clear_bit(0, &is_active);
+	expect_release = 0;
+	return 0;
+}
+
+/*
+ *	/dev/temperature handling
+ */
+
+static ssize_t usb_pcwd_temperature_read(struct file *file, char *data,
+				size_t len, loff_t *ppos)
+{
+	int temperature;
+
+	/* Can't seek (pwrite) on this device  */
+	if (ppos != &file->f_pos)
+		return -ESPIPE;
+
+	if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
+		return -EFAULT;
+
+	if (copy_to_user (data, &temperature, 1))
+		return -EFAULT;
+
+	return 1;
+}
+
+static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+/*
+ *	Notify system
+ */
+
+static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
+{
+	if (code==SYS_DOWN || code==SYS_HALT) {
+		/* Turn the WDT off */
+		usb_pcwd_stop(usb_pcwd_device);
+	}
+
+	return NOTIFY_DONE;
+}
+
+/*
+ *	Kernel Interfaces
+ */
+
+static struct file_operations usb_pcwd_fops = {
+	.owner =	THIS_MODULE,
+	.llseek =	no_llseek,
+	.write =	usb_pcwd_write,
+	.ioctl =	usb_pcwd_ioctl,
+	.open =		usb_pcwd_open,
+	.release =	usb_pcwd_release,
+};
+
+static struct miscdevice usb_pcwd_miscdev = {
+	.minor =	WATCHDOG_MINOR,
+	.name =		"watchdog",
+	.fops =		&usb_pcwd_fops,
+};
+
+static struct file_operations usb_pcwd_temperature_fops = {
+	.owner =	THIS_MODULE,
+	.llseek =	no_llseek,
+	.read =		usb_pcwd_temperature_read,
+	.open =		usb_pcwd_temperature_open,
+	.release =	usb_pcwd_temperature_release,
+};
+
+static struct miscdevice usb_pcwd_temperature_miscdev = {
+	.minor =	TEMP_MINOR,
+	.name =		"temperature",
+	.fops =		&usb_pcwd_temperature_fops,
+};
+
+static struct notifier_block usb_pcwd_notifier = {
+	.notifier_call =	usb_pcwd_notify_sys,
+};
+
+/**
+ *	usb_pcwd_delete
+ */
+static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd)
+{
+	if (usb_pcwd->intr_urb != NULL)
+		usb_free_urb (usb_pcwd->intr_urb);
+	if (usb_pcwd->intr_buffer != NULL)
+		usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size,
+				usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
+	kfree (usb_pcwd);
+}
+
+/**
+ *	usb_pcwd_probe
+ *
+ *	Called by the usb core when a new device is connected that it thinks
+ *	this driver might be interested in.
+ */
+static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id)
+{
+	struct usb_device *udev = interface_to_usbdev(interface);
+	struct usb_host_interface *iface_desc;
+	struct usb_endpoint_descriptor *endpoint;
+	struct usb_pcwd_private *usb_pcwd = NULL;
+	int pipe, maxp;
+	int retval = -ENOMEM;
+	int got_fw_rev;
+	unsigned char fw_rev_major, fw_rev_minor;
+	char fw_ver_str[20];
+	unsigned char option_switches, dummy;
+
+	/* See if the device offered us matches what we can accept */
+	if ((udev->descriptor.idVendor != USB_PCWD_VENDOR_ID) ||
+	    (udev->descriptor.idProduct != USB_PCWD_PRODUCT_ID)) {
+		return -ENODEV;
+	}
+
+	cards_found++;
+	if (cards_found > 1) {
+		printk(KERN_ERR PFX "This driver only supports 1 device\n");
+		return -ENODEV;
+	}
+
+	/* get the active interface descriptor */
+	iface_desc = &interface->altsetting[interface->act_altsetting];
+
+	/* check out that we have a HID device */
+	if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
+		printk(KERN_ERR PFX "The device isn't a Human Interface Device\n");
+		return -ENODEV;
+	}
+
+	/* check out the endpoint: it has to be Interrupt & IN */
+	endpoint = &iface_desc->endpoint[0].desc;
+
+	if (!((endpoint->bEndpointAddress & USB_DIR_IN) &&
+	     ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+				== USB_ENDPOINT_XFER_INT))) {
+		/* we didn't find a Interrupt endpoint with direction IN */
+		printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n");
+		return -ENODEV;
+	}
+
+	/* get a handle to the interrupt data pipe */
+	pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
+	maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
+
+	/* allocate memory for our device and initialize it */
+	usb_pcwd = kmalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL);
+	if (usb_pcwd == NULL) {
+		printk(KERN_ERR PFX "Out of memory\n");
+		goto error;
+	}
+	memset (usb_pcwd, 0x00, sizeof (*usb_pcwd));
+
+	usb_pcwd_device = usb_pcwd;
+
+	init_MUTEX (&usb_pcwd->sem);
+	usb_pcwd->udev = udev;
+	usb_pcwd->interface = interface;
+	usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
+	usb_pcwd->intr_size = (endpoint->wMaxPacketSize > 8 ? endpoint->wMaxPacketSize : 8);
+
+	/* set up the memory buffer's */
+	if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, SLAB_ATOMIC, &usb_pcwd->intr_dma))) {
+		printk(KERN_ERR PFX "Out of memory\n");
+		goto error;
+	}
+
+	/* allocate the urb's */
+	usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!usb_pcwd->intr_urb) {
+		printk(KERN_ERR PFX "Out of memory\n");
+		goto error;
+	}
+
+	/* initialise the intr urb's */
+	usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
+			usb_pcwd->intr_buffer, usb_pcwd->intr_size,
+			usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
+	usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
+	usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+	/* register our interrupt URB with the USB system */
+	if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
+		printk(KERN_ERR PFX "Problem registering interrupt URB\n");
+		retval = -EIO; /* failure */
+		goto error;
+	}
+
+	/* The device exists and can be communicated with */
+	usb_pcwd->exists = 1;
+
+	/* disable card */
+	usb_pcwd_stop(usb_pcwd);
+
+	/* Get the Firmware Version */
+	got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
+	if (got_fw_rev) {
+		sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
+	} else {
+		sprintf(fw_ver_str, "<card no answer>");
+	}
+
+	printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n",
+		fw_ver_str);
+
+	/* Get switch settings */
+	usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches);
+
+	printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
+		option_switches,
+		((option_switches & 0x10) ? "ON" : "OFF"),
+		((option_switches & 0x08) ? "ON" : "OFF"));
+
+	/* Check that the heartbeat value is within it's range ; if not reset to the default */
+	if (heartbeat < 1 || heartbeat > 0xFFFF) {
+		heartbeat = WATCHDOG_HEARTBEAT;
+		printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
+			heartbeat);
+	}
+
+	/* Calculate the watchdog's heartbeat */
+	usb_pcwd_set_heartbeat(usb_pcwd, heartbeat);
+
+	retval = register_reboot_notifier(&usb_pcwd_notifier);
+	if (retval != 0) {
+		printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+			retval);
+		goto error;
+	}
+
+	retval = misc_register(&usb_pcwd_miscdev);
+	if (retval != 0) {
+		printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+			WATCHDOG_MINOR, retval);
+		goto err_out_unregister_reboot;
+	}
+
+	retval = misc_register(&usb_pcwd_temperature_miscdev);
+	if (retval != 0) {
+		printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+			TEMP_MINOR, retval);
+		goto err_out_misc_deregister;
+	}
+
+	/* we can register the device now, as it is ready */
+	usb_set_intfdata (interface, usb_pcwd);
+
+	printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
+		heartbeat, nowayout);
+
+	return 0;
+
+err_out_misc_deregister:
+	misc_deregister(&usb_pcwd_miscdev);
+err_out_unregister_reboot:
+	unregister_reboot_notifier(&usb_pcwd_notifier);
+error:
+	usb_pcwd_delete (usb_pcwd);
+	usb_pcwd_device = NULL;
+	return retval;
+}
+
+
+/**
+ *	usb_pcwd_disconnect
+ *
+ *	Called by the usb core when the device is removed from the system.
+ *
+ *	This routine guarantees that the driver will not submit any more urbs
+ *	by clearing dev->udev.
+ */
+static void usb_pcwd_disconnect(struct usb_interface *interface)
+{
+	struct usb_pcwd_private *usb_pcwd;
+
+	/* prevent races with open() */
+	down (&disconnect_sem);
+
+	usb_pcwd = usb_get_intfdata (interface);
+	usb_set_intfdata (interface, NULL);
+
+	down (&usb_pcwd->sem);
+
+	/* Stop the timer before we leave */
+	if (!nowayout)
+		usb_pcwd_stop(usb_pcwd);
+
+	/* We should now stop communicating with the USB PCWD device */
+	usb_pcwd->exists = 0;
+
+	/* Deregister */
+	misc_deregister(&usb_pcwd_temperature_miscdev);
+	misc_deregister(&usb_pcwd_miscdev);
+	unregister_reboot_notifier(&usb_pcwd_notifier);
+
+	up (&usb_pcwd->sem);
+
+	/* Delete the USB PCWD device */
+	usb_pcwd_delete(usb_pcwd);
+
+	cards_found--;
+
+	up (&disconnect_sem);
+
+	printk(KERN_INFO PFX "USB PC Watchdog disconnected\n");
+}
+
+
+
+/**
+ *	usb_pcwd_init
+ */
+static int __init usb_pcwd_init(void)
+{
+	int result;
+
+	/* register this driver with the USB subsystem */
+	result = usb_register(&usb_pcwd_driver);
+	if (result) {
+		printk(KERN_ERR PFX "usb_register failed. Error number %d\n",
+		    result);
+		return result;
+	}
+
+	printk(KERN_INFO PFX DRIVER_DESC " " DRIVER_VERSION "\n");
+	return 0;
+}
+
+
+/**
+ *	usb_pcwd_exit
+ */
+static void __exit usb_pcwd_exit(void)
+{
+	/* deregister this driver with the USB subsystem */
+	usb_deregister(&usb_pcwd_driver);
+}
+
+
+module_init (usb_pcwd_init);
+module_exit (usb_pcwd_exit);

drivers/char/watchdog/sa1100_wdt.c

@@ -218,3 +218,4 @@ module_param(nowayout, int, 0);
 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
 
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/char/watchdog/sc1200wdt.c

@@ -486,3 +486,4 @@ module_exit(sc1200wdt_exit);
 MODULE_AUTHOR("Zwane Mwaikambo <zwane@commfireservices.com>");
 MODULE_DESCRIPTION("Driver for National Semiconductor PC87307/PC97307 watchdog component");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/char/watchdog/w83627hf_wdt.c

@@ -321,4 +321,4 @@ module_exit(wdt_exit);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Pdraig Brady <P@draigBrady.com>");
 MODULE_DESCRIPTION("w38627hf WDT driver");
-
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/char/watchdog/w83877f_wdt.c

@@ -427,3 +427,4 @@ module_exit(w83877f_wdt_unload);
 MODULE_AUTHOR("Scott and Bill Jennings");
 MODULE_DESCRIPTION("Driver for watchdog timer in w83877f chip");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/char/watchdog/wdt285.c

@@ -222,6 +222,7 @@ static void __exit footbridge_watchdog_exit(void)
 MODULE_AUTHOR("Phil Blundell <pb@nexus.co.uk>");
 MODULE_DESCRIPTION("Footbridge watchdog driver");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 
 module_param(soft_margin, int, 0);
 MODULE_PARM_DESC(soft_margin,"Watchdog timeout in seconds");

drivers/char/watchdog/wdt977.c

@@ -365,5 +365,7 @@ static void __exit nwwatchdog_exit(void)
 module_init(nwwatchdog_init);
 module_exit(nwwatchdog_exit);
 
+MODULE_AUTHOR("Woody Suwalski <woody@netwinder.org>");
 MODULE_DESCRIPTION("W83977AF Watchdog driver");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/char/watchdog/wdt_pci.c

@@ -653,3 +653,5 @@ module_exit(wdtpci_cleanup);
 MODULE_AUTHOR("JP Nollmann, Alan Cox");
 MODULE_DESCRIPTION("Driver for the ICS PCI watchdog cards");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS_MISCDEV(TEMP_MINOR);