/*
   *	Berkshire PCI-PC Watchdog Card Driver
   *

   *	(c) Copyright 2003-2007 Wim Van Sebroeck <wim@iguana.be>.

   *
   *	Based on source code of the following authors:
   *	  Ken Hollis <kenji@bitgate.com>,
   *	  Lindsay Harris <lindsay@bluegum.com>,

   *	  Alan Cox <alan@lxorguk.ukuu.org.uk>,

   *	  Matt Domsch <Matt_Domsch@dell.com>,
   *	  Rob Radez <rob@osinvestor.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.
   */
  
  /*

   *	A bells and whistles driver is available from:

   *	http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/
   *

   *	More info available at
   *	http://www.berkprod.com/ or http://www.pcwatchdog.com/

   */
  
  /*
   *	Includes, defines, variables, module parameters, ...
   */

  #include <linux/module.h>	/* For module specific items */
  #include <linux/moduleparam.h>	/* For new moduleparam's */
  #include <linux/types.h>	/* For standard types (like size_t) */
  #include <linux/errno.h>	/* For the -ENODEV/... values */
  #include <linux/kernel.h>	/* For printk/panic/... */
  #include <linux/delay.h>	/* For mdelay function */
  #include <linux/miscdevice.h>	/* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
  #include <linux/watchdog.h>	/* For the watchdog specific items */
  #include <linux/notifier.h>	/* For notifier support */
  #include <linux/reboot.h>	/* For reboot_notifier stuff */
  #include <linux/init.h>		/* For __init/__exit/... */
  #include <linux/fs.h>		/* For file operations */
  #include <linux/pci.h>		/* For pci functions */
  #include <linux/ioport.h>	/* For io-port access */
  #include <linux/spinlock.h>	/* For spin_lock/spin_unlock/... */

  #include <linux/uaccess.h>	/* For copy_to_user/put_user/... */
  #include <linux/io.h>		/* For inb/outb/... */

  
  /* Module and version information */

  #define WATCHDOG_VERSION "1.03"

  #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
  #define WATCHDOG_NAME "pcwd_pci"
  #define PFX WATCHDOG_NAME ": "

  #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "
  "

  
  /* Stuff for the PCI ID's  */
  #ifndef PCI_VENDOR_ID_QUICKLOGIC
  #define PCI_VENDOR_ID_QUICKLOGIC    0x11e3
  #endif
  
  #ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
  #define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
  #endif
  
  /*
   * These are the defines that describe the control status bits for the
   * PCI-PC Watchdog card.
   */

  /* Port 1 : Control Status #1 */
  #define WD_PCI_WTRP		0x01	/* Watchdog Trip status */
  #define WD_PCI_HRBT		0x02	/* Watchdog Heartbeat */
  #define WD_PCI_TTRP		0x04	/* Temperature Trip status */
  #define WD_PCI_RL2A		0x08	/* Relay 2 Active */
  #define WD_PCI_RL1A		0x10	/* Relay 1 Active */

  #define WD_PCI_R2DS		0x40	/* Relay 2 Disable Temperature-trip /
  									reset */

  #define WD_PCI_RLY2		0x80	/* Activate Relay 2 on the board */
  /* Port 2 : Control Status #2 */
  #define WD_PCI_WDIS		0x10	/* Watchdog Disable */
  #define WD_PCI_ENTP		0x20	/* Enable Temperature Trip Reset */
  #define WD_PCI_WRSP		0x40	/* Watchdog wrote response */
  #define WD_PCI_PCMD		0x80	/* PC has sent command */

  
  /* according to documentation max. time to process a command for the pci
   * watchdog card is 100 ms, so we give it 150 ms to do it's job */
  #define PCI_COMMAND_TIMEOUT	150
  
  /* Watchdog's internal commands */

  #define CMD_GET_STATUS				0x04
  #define CMD_GET_FIRMWARE_VERSION		0x08
  #define CMD_READ_WATCHDOG_TIMEOUT		0x18
  #define CMD_WRITE_WATCHDOG_TIMEOUT		0x19
  #define CMD_GET_CLEAR_RESET_COUNT		0x84

  /* Watchdog's Dip Switch heartbeat values */

  static const int heartbeat_tbl[] = {

  	5,	/* OFF-OFF-OFF	=  5 Sec  */
  	10,	/* OFF-OFF-ON	= 10 Sec  */
  	30,	/* OFF-ON-OFF	= 30 Sec  */
  	60,	/* OFF-ON-ON	=  1 Min  */
  	300,	/* ON-OFF-OFF	=  5 Min  */
  	600,	/* ON-OFF-ON	= 10 Min  */
  	1800,	/* ON-ON-OFF	= 30 Min  */
  	3600,	/* ON-ON-ON	=  1 hour */
  };

  /* We can only use 1 card due to the /dev/watchdog restriction */
  static int cards_found;
  
  /* internal variables */
  static int temp_panic;
  static unsigned long is_active;
  static char expect_release;

  /* this is private data for each PCI-PC watchdog card */
  static struct {
  	/* Wether or not the card has a temperature device */
  	int supports_temp;
  	/* The card's boot status */
  	int boot_status;
  	/* The cards I/O address */
  	unsigned long io_addr;
  	/* the lock for io operations */
  	spinlock_t io_lock;
  	/* the PCI-device */
  	struct pci_dev *pdev;

  } pcipcwd_private;
  
  /* module parameters */

  #define QUIET	0	/* Default */
  #define VERBOSE	1	/* Verbose */
  #define DEBUG	2	/* print fancy stuff too */
  static int debug = QUIET;
  module_param(debug, int, 0);
  MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");

  #define WATCHDOG_HEARTBEAT 0	/* default heartbeat =
  						delay-time from dip-switches */

  static int heartbeat = WATCHDOG_HEARTBEAT;
  module_param(heartbeat, int, 0);

  MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
  	"(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
  				__MODULE_STRING(WATCHDOG_HEARTBEAT) ")");

  static int nowayout = WATCHDOG_NOWAYOUT;

  module_param(nowayout, int, 0);

  MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
  					__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

  
  /*
   *	Internal functions
   */
  
  static int send_command(int cmd, int *msb, int *lsb)
  {
  	int got_response, count;

  	if (debug >= DEBUG)

  		printk(KERN_DEBUG PFX "sending following data "
  		"cmd=0x%02x msb=0x%02x lsb=0x%02x
  ", cmd, *msb, *lsb);

  	spin_lock(&pcipcwd_private.io_lock);
  	/* If a command requires data it should be written first.
  	 * Data for commands with 8 bits of data should be written to port 4.
  	 * Commands with 16 bits of data, should be written as LSB to port 4
  	 * and MSB to port 5.
  	 * After the required data has been written then write the command to
  	 * port 6. */
  	outb_p(*lsb, pcipcwd_private.io_addr + 4);
  	outb_p(*msb, pcipcwd_private.io_addr + 5);
  	outb_p(cmd, pcipcwd_private.io_addr + 6);
  
  	/* wait till the pci card processed the command, signaled by
  	 * the WRSP bit in port 2 and give it a max. timeout of
  	 * PCI_COMMAND_TIMEOUT to process */

  	got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;

  	for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response);
  								count++) {

  		mdelay(1);

  		got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;

  	}

  	if (debug >= DEBUG) {
  		if (got_response) {

  			printk(KERN_DEBUG PFX
  				"time to process command was: %d ms
  ",

  				count);
  		} else {

  			printk(KERN_DEBUG PFX
  				"card did not respond on command!
  ");

  		}
  	}

  	if (got_response) {
  		/* read back response */
  		*lsb = inb_p(pcipcwd_private.io_addr + 4);
  		*msb = inb_p(pcipcwd_private.io_addr + 5);
  
  		/* clear WRSP bit */
  		inb_p(pcipcwd_private.io_addr + 6);

  
  		if (debug >= DEBUG)

  			printk(KERN_DEBUG PFX "received following data for "
  				"cmd=0x%02x: msb=0x%02x lsb=0x%02x
  ",

  				cmd, *msb, *lsb);

  	}

  	spin_unlock(&pcipcwd_private.io_lock);
  
  	return got_response;
  }

  static inline void pcipcwd_check_temperature_support(void)
  {
  	if (inb_p(pcipcwd_private.io_addr) != 0xF0)
  		pcipcwd_private.supports_temp = 1;
  }
  
  static int pcipcwd_get_option_switches(void)
  {
  	int option_switches;
  
  	option_switches = inb_p(pcipcwd_private.io_addr + 3);
  	return option_switches;
  }
  
  static void pcipcwd_show_card_info(void)
  {
  	int got_fw_rev, fw_rev_major, fw_rev_minor;
  	char fw_ver_str[20];		/* The cards firmware version */
  	int option_switches;

  	got_fw_rev = send_command(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>");

  
  	/* Get switch settings */
  	option_switches = pcipcwd_get_option_switches();

  	printk(KERN_INFO PFX "Found card at port "
  		"0x%04x (Firmware: %s) %s temp option
  ",

  		(int) pcipcwd_private.io_addr, fw_ver_str,
  		(pcipcwd_private.supports_temp ? "with" : "without"));

  	printk(KERN_INFO PFX "Option switches (0x%02x): "
  		"Temperature Reset Enable=%s, Power On Delay=%s
  ",

  		option_switches,
  		((option_switches & 0x10) ? "ON" : "OFF"),
  		((option_switches & 0x08) ? "ON" : "OFF"));
  
  	if (pcipcwd_private.boot_status & WDIOF_CARDRESET)

  		printk(KERN_INFO PFX
  			"Previous reset was caused by the Watchdog card
  ");

  
  	if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
  		printk(KERN_INFO PFX "Card sensed a CPU Overheat
  ");
  
  	if (pcipcwd_private.boot_status == 0)

  		printk(KERN_INFO PFX
  			"No previous trip detected - Cold boot or reset
  ");

  }

  static int pcipcwd_start(void)
  {
  	int stat_reg;
  
  	spin_lock(&pcipcwd_private.io_lock);
  	outb_p(0x00, pcipcwd_private.io_addr + 3);
  	udelay(1000);
  
  	stat_reg = inb_p(pcipcwd_private.io_addr + 2);
  	spin_unlock(&pcipcwd_private.io_lock);

  	if (stat_reg & WD_PCI_WDIS) {

  		printk(KERN_ERR PFX "Card timer not enabled
  ");
  		return -1;
  	}

  	if (debug >= VERBOSE)
  		printk(KERN_DEBUG PFX "Watchdog started
  ");

  	return 0;
  }
  
  static int pcipcwd_stop(void)
  {
  	int stat_reg;
  
  	spin_lock(&pcipcwd_private.io_lock);
  	outb_p(0xA5, pcipcwd_private.io_addr + 3);
  	udelay(1000);
  
  	outb_p(0xA5, pcipcwd_private.io_addr + 3);
  	udelay(1000);
  
  	stat_reg = inb_p(pcipcwd_private.io_addr + 2);
  	spin_unlock(&pcipcwd_private.io_lock);

  	if (!(stat_reg & WD_PCI_WDIS)) {

  		printk(KERN_ERR PFX
  			"Card did not acknowledge disable attempt
  ");

  		return -1;
  	}

  	if (debug >= VERBOSE)
  		printk(KERN_DEBUG PFX "Watchdog stopped
  ");

  	return 0;
  }
  
  static int pcipcwd_keepalive(void)
  {
  	/* Re-trigger watchdog by writing to port 0 */

  	spin_lock(&pcipcwd_private.io_lock);

  	outb_p(0x42, pcipcwd_private.io_addr);	/* send out any data */

  	spin_unlock(&pcipcwd_private.io_lock);

  
  	if (debug >= DEBUG)
  		printk(KERN_DEBUG PFX "Watchdog keepalive signal send
  ");

  	return 0;
  }
  
  static int pcipcwd_set_heartbeat(int t)
  {
  	int t_msb = t / 256;
  	int t_lsb = t % 256;
  
  	if ((t < 0x0001) || (t > 0xFFFF))
  		return -EINVAL;
  
  	/* Write new heartbeat to watchdog */
  	send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
  
  	heartbeat = t;

  	if (debug >= VERBOSE)
  		printk(KERN_DEBUG PFX "New heartbeat: %d
  ",
  		       heartbeat);

  	return 0;
  }
  
  static int pcipcwd_get_status(int *status)
  {

  	int control_status;

  	*status = 0;

  	control_status = inb_p(pcipcwd_private.io_addr + 1);
  	if (control_status & WD_PCI_WTRP)

  		*status |= WDIOF_CARDRESET;

  	if (control_status & WD_PCI_TTRP) {

  		*status |= WDIOF_OVERHEAT;
  		if (temp_panic)
  			panic(PFX "Temperature overheat trip!
  ");
  	}

  	if (debug >= DEBUG)
  		printk(KERN_DEBUG PFX "Control Status #1: 0x%02x
  ",
  		       control_status);

  	return 0;
  }
  
  static int pcipcwd_clear_status(void)
  {

  	int control_status;
  	int msb;
  	int reset_counter;

  	if (debug >= VERBOSE)
  		printk(KERN_INFO PFX "clearing watchdog trip status & LED
  ");

  	control_status = inb_p(pcipcwd_private.io_addr + 1);

  	if (debug >= DEBUG) {
  		printk(KERN_DEBUG PFX "status was: 0x%02x
  ", control_status);
  		printk(KERN_DEBUG PFX "sending: 0x%02x
  ",
  		       (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
  	}

  	/* clear trip status & LED and keep mode of relay 2 */

  	outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP,
  						pcipcwd_private.io_addr + 1);

  
  	/* clear reset counter */

  	msb = 0;
  	reset_counter = 0xff;

  	send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);

  	if (debug >= DEBUG) {
  		printk(KERN_DEBUG PFX "reset count was: 0x%02x
  ",
  		       reset_counter);
  	}

  	return 0;
  }
  
  static int pcipcwd_get_temperature(int *temperature)
  {
  	*temperature = 0;
  	if (!pcipcwd_private.supports_temp)
  		return -ENODEV;

  	spin_lock(&pcipcwd_private.io_lock);

  	*temperature = inb_p(pcipcwd_private.io_addr);

  	spin_unlock(&pcipcwd_private.io_lock);

  	/*
  	 * Convert celsius to fahrenheit, since this was
  	 * the decided 'standard' for this return value.
  	 */

  	*temperature = (*temperature * 9 / 5) + 32;

  	if (debug >= DEBUG) {
  		printk(KERN_DEBUG PFX "temperature is: %d F
  ",
  		       *temperature);
  	}

  	return 0;
  }

  static int pcipcwd_get_timeleft(int *time_left)
  {
  	int msb;
  	int lsb;
  
  	/* Read the time that's left before rebooting */
  	/* Note: if the board is not yet armed then we will read 0xFFFF */
  	send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
  
  	*time_left = (msb << 8) + lsb;
  
  	if (debug >= VERBOSE)
  		printk(KERN_DEBUG PFX "Time left before next reboot: %d
  ",
  		       *time_left);
  
  	return 0;
  }

  /*
   *	/dev/watchdog handling
   */
  
  static ssize_t pcipcwd_write(struct file *file, const char __user *data,

  			     size_t len, loff_t *ppos)

  {
  	/* 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 */
  		pcipcwd_keepalive();
  	}
  	return len;
  }

  static long pcipcwd_ioctl(struct file *file, unsigned int cmd,
  						unsigned long arg)

  {
  	void __user *argp = (void __user *)arg;
  	int __user *p = argp;

  	static const struct watchdog_info ident = {

  		.options =		WDIOF_OVERHEAT |
  					WDIOF_CARDRESET |
  					WDIOF_KEEPALIVEPING |
  					WDIOF_SETTIMEOUT |
  					WDIOF_MAGICCLOSE,
  		.firmware_version =	1,
  		.identity =		WATCHDOG_DRIVER_NAME,
  	};
  
  	switch (cmd) {

  	case WDIOC_GETSUPPORT:

  		return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;

  
  	case WDIOC_GETSTATUS:
  	{
  		int status;
  		pcipcwd_get_status(&status);
  		return put_user(status, p);
  	}

  	case WDIOC_GETBOOTSTATUS:
  		return put_user(pcipcwd_private.boot_status, p);

  	case WDIOC_GETTEMP:
  	{
  		int temperature;

  		if (pcipcwd_get_temperature(&temperature))
  			return -EFAULT;

  		return put_user(temperature, p);
  	}

  	case WDIOC_SETOPTIONS:
  	{
  		int new_options, retval = -EINVAL;

  		if (get_user(new_options, p))

  			return -EFAULT;

  		if (new_options & WDIOS_DISABLECARD) {
  			if (pcipcwd_stop())
  				return -EIO;
  			retval = 0;
  		}

  		if (new_options & WDIOS_ENABLECARD) {
  			if (pcipcwd_start())
  				return -EIO;
  			retval = 0;
  		}

  		if (new_options & WDIOS_TEMPPANIC) {
  			temp_panic = 1;
  			retval = 0;

  		}

  		return retval;
  	}

  	case WDIOC_KEEPALIVE:
  		pcipcwd_keepalive();
  		return 0;

  	case WDIOC_SETTIMEOUT:
  	{
  		int new_heartbeat;

  		if (get_user(new_heartbeat, p))
  			return -EFAULT;

  		if (pcipcwd_set_heartbeat(new_heartbeat))

  			return -EINVAL;

  		pcipcwd_keepalive();
  		/* Fall */
  	}

  	case WDIOC_GETTIMEOUT:
  		return put_user(heartbeat, p);

  	case WDIOC_GETTIMELEFT:
  	{
  		int time_left;

  		if (pcipcwd_get_timeleft(&time_left))
  			return -EFAULT;
  
  		return put_user(time_left, p);
  	}

  	default:
  		return -ENOTTY;

  	}
  }
  
  static int pcipcwd_open(struct inode *inode, struct file *file)
  {
  	/* /dev/watchdog can only be opened once */

  	if (test_and_set_bit(0, &is_active)) {

  		if (debug >= VERBOSE)

  			printk(KERN_ERR PFX
  				"Attempt to open already opened device.
  ");

  		return -EBUSY;

  	}

  
  	/* Activate */
  	pcipcwd_start();
  	pcipcwd_keepalive();
  	return nonseekable_open(inode, file);
  }
  
  static int pcipcwd_release(struct inode *inode, struct file *file)
  {
  	/*
  	 *      Shut off the timer.
  	 */
  	if (expect_release == 42) {
  		pcipcwd_stop();
  	} else {

  		printk(KERN_CRIT PFX
  			"Unexpected close, not stopping watchdog!
  ");

  		pcipcwd_keepalive();
  	}
  	expect_release = 0;
  	clear_bit(0, &is_active);
  	return 0;
  }
  
  /*
   *	/dev/temperature handling
   */
  
  static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
  				size_t len, loff_t *ppos)
  {
  	int temperature;
  
  	if (pcipcwd_get_temperature(&temperature))
  		return -EFAULT;

  	if (copy_to_user(data, &temperature, 1))

  		return -EFAULT;
  
  	return 1;
  }
  
  static int pcipcwd_temp_open(struct inode *inode, struct file *file)
  {
  	if (!pcipcwd_private.supports_temp)
  		return -ENODEV;
  
  	return nonseekable_open(inode, file);
  }
  
  static int pcipcwd_temp_release(struct inode *inode, struct file *file)
  {
  	return 0;
  }
  
  /*
   *	Notify system
   */

  static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code,
  								void *unused)

  {

  	if (code == SYS_DOWN || code == SYS_HALT)
  		pcipcwd_stop();	/* Turn the WDT off */

  
  	return NOTIFY_DONE;
  }
  
  /*
   *	Kernel Interfaces
   */

  static const struct file_operations pcipcwd_fops = {

  	.owner =	THIS_MODULE,
  	.llseek =	no_llseek,
  	.write =	pcipcwd_write,

  	.unlocked_ioctl = pcipcwd_ioctl,

  	.open =		pcipcwd_open,
  	.release =	pcipcwd_release,
  };
  
  static struct miscdevice pcipcwd_miscdev = {
  	.minor =	WATCHDOG_MINOR,
  	.name =		"watchdog",
  	.fops =		&pcipcwd_fops,
  };

  static const struct file_operations pcipcwd_temp_fops = {

  	.owner =	THIS_MODULE,
  	.llseek =	no_llseek,
  	.read =		pcipcwd_temp_read,
  	.open =		pcipcwd_temp_open,
  	.release =	pcipcwd_temp_release,
  };
  
  static struct miscdevice pcipcwd_temp_miscdev = {
  	.minor =	TEMP_MINOR,
  	.name =		"temperature",
  	.fops =		&pcipcwd_temp_fops,
  };
  
  static struct notifier_block pcipcwd_notifier = {
  	.notifier_call =	pcipcwd_notify_sys,
  };
  
  /*
   *	Init & exit routines
   */

  static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
  		const struct pci_device_id *ent)
  {
  	int ret = -EIO;

  
  	cards_found++;
  	if (cards_found == 1)
  		printk(KERN_INFO PFX DRIVER_VERSION);
  
  	if (cards_found > 1) {
  		printk(KERN_ERR PFX "This driver only supports 1 device
  ");
  		return -ENODEV;
  	}
  
  	if (pci_enable_device(pdev)) {
  		printk(KERN_ERR PFX "Not possible to enable PCI Device
  ");
  		return -ENODEV;
  	}
  
  	if (pci_resource_start(pdev, 0) == 0x0000) {
  		printk(KERN_ERR PFX "No I/O-Address for card detected
  ");
  		ret = -ENODEV;
  		goto err_out_disable_device;
  	}
  
  	pcipcwd_private.pdev = pdev;
  	pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
  
  	if (pci_request_regions(pdev, WATCHDOG_NAME)) {
  		printk(KERN_ERR PFX "I/O address 0x%04x already in use
  ",
  			(int) pcipcwd_private.io_addr);
  		ret = -EIO;
  		goto err_out_disable_device;
  	}
  
  	/* get the boot_status */
  	pcipcwd_get_status(&pcipcwd_private.boot_status);
  
  	/* clear the "card caused reboot" flag */
  	pcipcwd_clear_status();
  
  	/* disable card */
  	pcipcwd_stop();
  
  	/* Check whether or not the card supports the temperature device */

  	pcipcwd_check_temperature_support();

  	/* Show info about the card itself */
  	pcipcwd_show_card_info();

  	/* If heartbeat = 0 then we use the heartbeat from the dip-switches */
  	if (heartbeat == 0)

  		heartbeat =
  			heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];

  	/* Check that the heartbeat value is within it's range ;
  	 * if not reset to the default */

  	if (pcipcwd_set_heartbeat(heartbeat)) {
  		pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);

  		printk(KERN_INFO PFX
  			"heartbeat value must be 0<heartbeat<65536, using %d
  ",

  			WATCHDOG_HEARTBEAT);
  	}
  
  	ret = register_reboot_notifier(&pcipcwd_notifier);
  	if (ret != 0) {

  		printk(KERN_ERR PFX
  			"cannot register reboot notifier (err=%d)
  ", ret);

  		goto err_out_release_region;
  	}
  
  	if (pcipcwd_private.supports_temp) {
  		ret = misc_register(&pcipcwd_temp_miscdev);
  		if (ret != 0) {

  			printk(KERN_ERR PFX "cannot register miscdev on "
  				"minor=%d (err=%d)
  ", TEMP_MINOR, ret);

  			goto err_out_unregister_reboot;
  		}
  	}
  
  	ret = misc_register(&pcipcwd_miscdev);
  	if (ret != 0) {

  		printk(KERN_ERR PFX
  			"cannot register miscdev on minor=%d (err=%d)
  ",

  			WATCHDOG_MINOR, ret);
  		goto err_out_misc_deregister;
  	}
  
  	printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)
  ",
  		heartbeat, nowayout);
  
  	return 0;
  
  err_out_misc_deregister:
  	if (pcipcwd_private.supports_temp)
  		misc_deregister(&pcipcwd_temp_miscdev);
  err_out_unregister_reboot:
  	unregister_reboot_notifier(&pcipcwd_notifier);
  err_out_release_region:
  	pci_release_regions(pdev);
  err_out_disable_device:
  	pci_disable_device(pdev);
  	return ret;
  }
  
  static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
  {
  	/* Stop the timer before we leave */
  	if (!nowayout)
  		pcipcwd_stop();
  
  	/* Deregister */
  	misc_deregister(&pcipcwd_miscdev);
  	if (pcipcwd_private.supports_temp)
  		misc_deregister(&pcipcwd_temp_miscdev);
  	unregister_reboot_notifier(&pcipcwd_notifier);
  	pci_release_regions(pdev);
  	pci_disable_device(pdev);
  	cards_found--;
  }

  static DEFINE_PCI_DEVICE_TABLE(pcipcwd_pci_tbl) = {

  	{ PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
  		PCI_ANY_ID, PCI_ANY_ID, },
  	{ 0 },			/* End of list */
  };
  MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
  
  static struct pci_driver pcipcwd_driver = {
  	.name		= WATCHDOG_NAME,
  	.id_table	= pcipcwd_pci_tbl,
  	.probe		= pcipcwd_card_init,
  	.remove		= __devexit_p(pcipcwd_card_exit),
  };
  
  static int __init pcipcwd_init_module(void)
  {

  	spin_lock_init(&pcipcwd_private.io_lock);

  
  	return pci_register_driver(&pcipcwd_driver);
  }
  
  static void __exit pcipcwd_cleanup_module(void)
  {
  	pci_unregister_driver(&pcipcwd_driver);

  
  	printk(KERN_INFO PFX "Watchdog Module Unloaded.
  ");

  }
  
  module_init(pcipcwd_init_module);
  module_exit(pcipcwd_cleanup_module);
  
  MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
  MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
  MODULE_ALIAS_MISCDEV(TEMP_MINOR);