[mirror_ubuntu-zesty-kernel.git] / drivers / char / watchdog / pcwd_pci.c

/*
 *	Berkshire PCI-PC Watchdog Card Driver
 *
 *	(c) Copyright 2003 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@redhat.com>,
 *	  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.pcwd.de/
 *	More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/
 */

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

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

/* Module and version information */
#define WATCHDOG_VERSION "1.02"
#define WATCHDOG_DATE "03 Sep 2005"
#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 " (" WATCHDOG_DATE ")\n"

/* 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

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

/* module parameters */
#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) ")");

static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");

/*
 *	Internal functions
 */

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

	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 (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);
	}
	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\n",
		(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\n",
		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\n");

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

	if (pcipcwd_private.boot_status == 0)
		printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
}

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\n");
		return -1;
	}

	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\n");
		return -1;
	}

	return 0;
}

static int pcipcwd_keepalive(void)
{
	/* Re-trigger watchdog by writing to port 0 */
	outb_p(0x42, pcipcwd_private.io_addr);	/* send out any data */
	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;
	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!\n");
	}

	return 0;
}

static int pcipcwd_clear_status(void)
{
	int control_status;
	int msb;
	int reset_counter;

	control_status = inb_p(pcipcwd_private.io_addr + 1);

	/* 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);

	return 0;
}

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

	*temperature = inb_p(pcipcwd_private.io_addr);

	/*
	 * Convert celsius to fahrenheit, since this was
	 * the decided 'standard' for this return value.
	 */
	*temperature = (*temperature * 9 / 5) + 32;

	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 int pcipcwd_ioctl(struct inode *inode, struct file *file,
			  unsigned int cmd, unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	int __user *p = argp;
	static 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_KEEPALIVE:
			pcipcwd_keepalive();
			return 0;

		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_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);

		default:
			return -ENOIOCTLCMD;
	}
}

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)) {
		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!\n");
		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) {
		/* Turn the WDT off */
		pcipcwd_stop();
	}

	return NOTIFY_DONE;
}

/*
 *	Kernel Interfaces
 */

static struct file_operations pcipcwd_fops = {
	.owner =	THIS_MODULE,
	.llseek =	no_llseek,
	.write =	pcipcwd_write,
	.ioctl =	pcipcwd_ioctl,
	.open =		pcipcwd_open,
	.release =	pcipcwd_release,
};

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

static 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\n");
		return -ENODEV;
	}

	if (pci_enable_device(pdev)) {
		printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
		return -ENODEV;
	}

	if (pci_resource_start(pdev, 0) == 0x0000) {
		printk(KERN_ERR PFX "No I/O-Address for card detected\n");
		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\n",
			(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();

	/* 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\n",
			WATCHDOG_HEARTBEAT);
	}

	ret = register_reboot_notifier(&pcipcwd_notifier);
	if (ret != 0) {
		printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
			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)\n",
				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)\n",
			WATCHDOG_MINOR, ret);
		goto err_out_misc_deregister;
	}

	printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
		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 struct pci_device_id 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);
}

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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Berkshire PCI-PC Watchdog Card Driver
	3	*
	4	* (c) Copyright 2003 Wim Van Sebroeck <wim@iguana.be>.
	5	*
	6	* Based on source code of the following authors:
	7	* Ken Hollis <kenji@bitgate.com>,
	8	* Lindsay Harris <lindsay@bluegum.com>,
	9	* Alan Cox <alan@redhat.com>,
	10	* Matt Domsch <Matt_Domsch@dell.com>,
	11	* Rob Radez <rob@osinvestor.com>
	12	*
	13	* This program is free software; you can redistribute it and/or
	14	* modify it under the terms of the GNU General Public License
	15	* as published by the Free Software Foundation; either version
	16	* 2 of the License, or (at your option) any later version.
	17	*
	18	* Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
	19	* provide warranty for any of this software. This material is
	20	* provided "AS-IS" and at no charge.
	21	*/
	22
	23	/*
	24	* A bells and whistles driver is available from http://www.pcwd.de/
	25	* More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/
	26	*/
	27
	28	/*
	29	* Includes, defines, variables, module parameters, ...
	30	*/
	31
c315b7e8 WVS	32	#include <linux/config.h> /* For CONFIG_WATCHDOG_NOWAYOUT/... */
	33	#include <linux/module.h> /* For module specific items */
	34	#include <linux/moduleparam.h> /* For new moduleparam's */
	35	#include <linux/types.h> /* For standard types (like size_t) */
	36	#include <linux/errno.h> /* For the -ENODEV/... values */
	37	#include <linux/kernel.h> /* For printk/panic/... */
	38	#include <linux/delay.h> /* For mdelay function */
	39	#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
	40	#include <linux/watchdog.h> /* For the watchdog specific items */
	41	#include <linux/notifier.h> /* For notifier support */
	42	#include <linux/reboot.h> /* For reboot_notifier stuff */
	43	#include <linux/init.h> /* For __init/__exit/... */
	44	#include <linux/fs.h> /* For file operations */
	45	#include <linux/pci.h> /* For pci functions */
	46	#include <linux/ioport.h> /* For io-port access */
	47	#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
	48
	49	#include <asm/uaccess.h> /* For copy_to_user/put_user/... */
	50	#include <asm/io.h> /* For inb/outb/... */
1da177e4 LT	51
1da177e4 LT	52	/* Module and version information */
a0800f6d WVS	53	#define WATCHDOG_VERSION "1.02"
a0800f6d WVS	54	#define WATCHDOG_DATE "03 Sep 2005"
1da177e4 LT	55	#define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
	56	#define WATCHDOG_NAME "pcwd_pci"
	57	#define PFX WATCHDOG_NAME ": "
	58	#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n"
	59
	60	/* Stuff for the PCI ID's */
	61	#ifndef PCI_VENDOR_ID_QUICKLOGIC
	62	#define PCI_VENDOR_ID_QUICKLOGIC 0x11e3
	63	#endif
	64
	65	#ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
	66	#define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
	67	#endif
	68
	69	/*
	70	* These are the defines that describe the control status bits for the
	71	* PCI-PC Watchdog card.
	72	*/
a0800f6d WVS	73	/* Port 1 : Control Status #1 */
	74	#define WD_PCI_WTRP 0x01 /* Watchdog Trip status */
	75	#define WD_PCI_HRBT 0x02 /* Watchdog Heartbeat */
	76	#define WD_PCI_TTRP 0x04 /* Temperature Trip status */
	77	#define WD_PCI_RL2A 0x08 /* Relay 2 Active */
	78	#define WD_PCI_RL1A 0x10 /* Relay 1 Active */
	79	#define WD_PCI_R2DS 0x40 /* Relay 2 Disable Temperature-trip/reset */
	80	#define WD_PCI_RLY2 0x80 /* Activate Relay 2 on the board */
	81	/* Port 2 : Control Status #2 */
	82	#define WD_PCI_WDIS 0x10 /* Watchdog Disable */
	83	#define WD_PCI_ENTP 0x20 /* Enable Temperature Trip Reset */
	84	#define WD_PCI_WRSP 0x40 /* Watchdog wrote response */
	85	#define WD_PCI_PCMD 0x80 /* PC has sent command */
1da177e4 LT	86
	87	/* according to documentation max. time to process a command for the pci
	88	* watchdog card is 100 ms, so we give it 150 ms to do it's job */
	89	#define PCI_COMMAND_TIMEOUT 150
	90
	91	/* Watchdog's internal commands */
a0800f6d WVS	92	#define CMD_GET_STATUS 0x04
	93	#define CMD_GET_FIRMWARE_VERSION 0x08
	94	#define CMD_READ_WATCHDOG_TIMEOUT 0x18
	95	#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19
	96	#define CMD_GET_CLEAR_RESET_COUNT 0x84
1da177e4 LT	97
	98	/* We can only use 1 card due to the /dev/watchdog restriction */
	99	static int cards_found;
	100
	101	/* internal variables */
	102	static int temp_panic;
	103	static unsigned long is_active;
	104	static char expect_release;
a0800f6d WVS	105	static struct { /* this is private data for each PCI-PC watchdog card */
	106	int supports_temp; /* Wether or not the card has a temperature device */
	107	int boot_status; /* The card's boot status */
	108	unsigned long io_addr; /* The cards I/O address */
	109	spinlock_t io_lock; /* the lock for io operations */
	110	struct pci_dev pdev; / the PCI-device */
1da177e4 LT	111	} pcipcwd_private;
	112
	113	/* module parameters */
	114	#define WATCHDOG_HEARTBEAT 2 /* 2 sec default heartbeat */
	115	static int heartbeat = WATCHDOG_HEARTBEAT;
	116	module_param(heartbeat, int, 0);
	117	MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
	118
4bfdf378	119	static int nowayout = WATCHDOG_NOWAYOUT;
1da177e4 LT	120	module_param(nowayout, int, 0);
	121	MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
	122
	123	/*
	124	* Internal functions
	125	*/
	126
	127	static int send_command(int cmd, int msb, int lsb)
	128	{
	129	int got_response, count;
	130
	131	spin_lock(&pcipcwd_private.io_lock);
	132	/* If a command requires data it should be written first.
	133	* Data for commands with 8 bits of data should be written to port 4.
	134	* Commands with 16 bits of data, should be written as LSB to port 4
	135	* and MSB to port 5.
	136	* After the required data has been written then write the command to
	137	* port 6. */
	138	outb_p(*lsb, pcipcwd_private.io_addr + 4);
	139	outb_p(*msb, pcipcwd_private.io_addr + 5);
	140	outb_p(cmd, pcipcwd_private.io_addr + 6);
	141
	142	/* wait till the pci card processed the command, signaled by
	143	* the WRSP bit in port 2 and give it a max. timeout of
	144	* PCI_COMMAND_TIMEOUT to process */
a0800f6d	145	got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
1da177e4 LT	146	for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) {
1da177e4 LT	147	mdelay(1);
a0800f6d	148	got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
1da177e4 LT	149	}
	150
	151	if (got_response) {
	152	/* read back response */
	153	*lsb = inb_p(pcipcwd_private.io_addr + 4);
	154	*msb = inb_p(pcipcwd_private.io_addr + 5);
	155
	156	/* clear WRSP bit */
	157	inb_p(pcipcwd_private.io_addr + 6);
	158	}
	159	spin_unlock(&pcipcwd_private.io_lock);
	160
	161	return got_response;
	162	}
	163
a0800f6d WVS	164	static inline void pcipcwd_check_temperature_support(void)
	165	{
	166	if (inb_p(pcipcwd_private.io_addr) != 0xF0)
	167	pcipcwd_private.supports_temp = 1;
	168	}
	169
	170	static int pcipcwd_get_option_switches(void)
	171	{
	172	int option_switches;
	173
	174	option_switches = inb_p(pcipcwd_private.io_addr + 3);
	175	return option_switches;
	176	}
	177
	178	static void pcipcwd_show_card_info(void)
	179	{
	180	int got_fw_rev, fw_rev_major, fw_rev_minor;
	181	char fw_ver_str[20]; /* The cards firmware version */
	182	int option_switches;
	183
	184	got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
	185	if (got_fw_rev) {
	186	sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
	187	} else {
	188	sprintf(fw_ver_str, "<card no answer>");
	189	}
	190
	191	/* Get switch settings */
	192	option_switches = pcipcwd_get_option_switches();
	193
	194	printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n",
	195	(int) pcipcwd_private.io_addr, fw_ver_str,
	196	(pcipcwd_private.supports_temp ? "with" : "without"));
	197
	198	printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
	199	option_switches,
	200	((option_switches & 0x10) ? "ON" : "OFF"),
	201	((option_switches & 0x08) ? "ON" : "OFF"));
	202
	203	if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
	204	printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n");
	205
	206	if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
	207	printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
	208
	209	if (pcipcwd_private.boot_status == 0)
	210	printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
	211	}
	212
1da177e4 LT	213	static int pcipcwd_start(void)
	214	{
	215	int stat_reg;
	216
	217	spin_lock(&pcipcwd_private.io_lock);
	218	outb_p(0x00, pcipcwd_private.io_addr + 3);
	219	udelay(1000);
	220
	221	stat_reg = inb_p(pcipcwd_private.io_addr + 2);
	222	spin_unlock(&pcipcwd_private.io_lock);
	223
a0800f6d	224	if (stat_reg & WD_PCI_WDIS) {
1da177e4 LT	225	printk(KERN_ERR PFX "Card timer not enabled\n");
	226	return -1;
	227	}
	228
	229	return 0;
	230	}
	231
	232	static int pcipcwd_stop(void)
	233	{
	234	int stat_reg;
	235
	236	spin_lock(&pcipcwd_private.io_lock);
	237	outb_p(0xA5, pcipcwd_private.io_addr + 3);
	238	udelay(1000);
	239
	240	outb_p(0xA5, pcipcwd_private.io_addr + 3);
	241	udelay(1000);
	242
	243	stat_reg = inb_p(pcipcwd_private.io_addr + 2);
	244	spin_unlock(&pcipcwd_private.io_lock);
	245
a0800f6d	246	if (!(stat_reg & WD_PCI_WDIS)) {
1da177e4 LT	247	printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
	248	return -1;
	249	}
	250
	251	return 0;
	252	}
	253
	254	static int pcipcwd_keepalive(void)
	255	{
	256	/* Re-trigger watchdog by writing to port 0 */
a0800f6d	257	outb_p(0x42, pcipcwd_private.io_addr); /* send out any data */
1da177e4 LT	258	return 0;
	259	}
	260
	261	static int pcipcwd_set_heartbeat(int t)
	262	{
	263	int t_msb = t / 256;
	264	int t_lsb = t % 256;
	265
	266	if ((t < 0x0001) \|\| (t > 0xFFFF))
	267	return -EINVAL;
	268
	269	/* Write new heartbeat to watchdog */
	270	send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
	271
	272	heartbeat = t;
	273	return 0;
	274	}
	275
	276	static int pcipcwd_get_status(int *status)
	277	{
a0800f6d	278	int control_status;
1da177e4 LT	279
1da177e4 LT	280	*status=0;
a0800f6d WVS	281	control_status = inb_p(pcipcwd_private.io_addr + 1);
a0800f6d WVS	282	if (control_status & WD_PCI_WTRP)
1da177e4	283	*status \|= WDIOF_CARDRESET;
a0800f6d	284	if (control_status & WD_PCI_TTRP) {
1da177e4 LT	285	*status \|= WDIOF_OVERHEAT;
	286	if (temp_panic)
	287	panic(PFX "Temperature overheat trip!\n");
	288	}
	289
	290	return 0;
	291	}
	292
	293	static int pcipcwd_clear_status(void)
	294	{
a0800f6d WVS	295	int control_status;
	296	int msb;
	297	int reset_counter;
	298
	299	control_status = inb_p(pcipcwd_private.io_addr + 1);
	300
	301	/* clear trip status & LED and keep mode of relay 2 */
	302	outb_p((control_status & WD_PCI_R2DS) \| WD_PCI_WTRP, pcipcwd_private.io_addr + 1);
	303
	304	/* clear reset counter */
	305	msb=0;
	306	reset_counter=0xff;
	307	send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
	308
1da177e4 LT	309	return 0;
	310	}
	311
	312	static int pcipcwd_get_temperature(int *temperature)
	313	{
	314	*temperature = 0;
	315	if (!pcipcwd_private.supports_temp)
	316	return -ENODEV;
	317
a0800f6d WVS	318	*temperature = inb_p(pcipcwd_private.io_addr);
a0800f6d WVS	319
1da177e4 LT	320	/*
	321	* Convert celsius to fahrenheit, since this was
	322	* the decided 'standard' for this return value.
	323	*/
a0800f6d	324	temperature = (temperature * 9 / 5) + 32;
1da177e4 LT	325
	326	return 0;
	327	}
	328
	329	/*
	330	* /dev/watchdog handling
	331	*/
	332
	333	static ssize_t pcipcwd_write(struct file file, const char __user data,
a0800f6d	334	size_t len, loff_t *ppos)
1da177e4 LT	335	{
	336	/* See if we got the magic character 'V' and reload the timer */
	337	if (len) {
	338	if (!nowayout) {
	339	size_t i;
	340
	341	/* note: just in case someone wrote the magic character
	342	* five months ago... */
	343	expect_release = 0;
	344
	345	/* scan to see whether or not we got the magic character */
	346	for (i = 0; i != len; i++) {
	347	char c;
	348	if(get_user(c, data+i))
	349	return -EFAULT;
	350	if (c == 'V')
	351	expect_release = 42;
	352	}
	353	}
	354
	355	/* someone wrote to us, we should reload the timer */
	356	pcipcwd_keepalive();
	357	}
	358	return len;
	359	}
	360
	361	static int pcipcwd_ioctl(struct inode inode, struct file file,
	362	unsigned int cmd, unsigned long arg)
	363	{
	364	void __user argp = (void __user )arg;
	365	int __user *p = argp;
	366	static struct watchdog_info ident = {
	367	.options = WDIOF_OVERHEAT \|
	368	WDIOF_CARDRESET \|
	369	WDIOF_KEEPALIVEPING \|
	370	WDIOF_SETTIMEOUT \|
	371	WDIOF_MAGICCLOSE,
	372	.firmware_version = 1,
	373	.identity = WATCHDOG_DRIVER_NAME,
	374	};
	375
	376	switch (cmd) {
	377	case WDIOC_GETSUPPORT:
	378	return copy_to_user(argp, &ident,
	379	sizeof (ident)) ? -EFAULT : 0;
	380
	381	case WDIOC_GETSTATUS:
	382	{
	383	int status;
	384
	385	pcipcwd_get_status(&status);
	386
	387	return put_user(status, p);
	388	}
	389
	390	case WDIOC_GETBOOTSTATUS:
	391	return put_user(pcipcwd_private.boot_status, p);
	392
	393	case WDIOC_GETTEMP:
	394	{
	395	int temperature;
	396
	397	if (pcipcwd_get_temperature(&temperature))
	398	return -EFAULT;
399
400	return put_user(temperature, p);
401	}
402
403	case WDIOC_KEEPALIVE:
404	pcipcwd_keepalive();
405	return 0;
406
407	case WDIOC_SETOPTIONS:
408	{
409	int new_options, retval = -EINVAL;
410
411	if (get_user (new_options, p))
412	return -EFAULT;
413
414	if (new_options & WDIOS_DISABLECARD) {
c315b7e8 WVS	415	if (pcipcwd_stop())
c315b7e8 WVS	416	return -EIO;
1da177e4 LT	417	retval = 0;
	418	}
	419
	420	if (new_options & WDIOS_ENABLECARD) {
c315b7e8 WVS	421	if (pcipcwd_start())
c315b7e8 WVS	422	return -EIO;
1da177e4 LT	423	retval = 0;
	424	}
	425
	426	if (new_options & WDIOS_TEMPPANIC) {
	427	temp_panic = 1;
	428	retval = 0;
	429	}
	430
	431	return retval;
	432	}
	433
	434	case WDIOC_SETTIMEOUT:
	435	{
	436	int new_heartbeat;
	437
	438	if (get_user(new_heartbeat, p))
	439	return -EFAULT;
	440
	441	if (pcipcwd_set_heartbeat(new_heartbeat))
	442	return -EINVAL;
	443
	444	pcipcwd_keepalive();
	445	/* Fall */
	446	}
	447
	448	case WDIOC_GETTIMEOUT:
	449	return put_user(heartbeat, p);
	450
	451	default:
	452	return -ENOIOCTLCMD;
	453	}
	454	}
	455
	456	static int pcipcwd_open(struct inode inode, struct file file)
	457	{
	458	/* /dev/watchdog can only be opened once */
a0800f6d	459	if (test_and_set_bit(0, &is_active)) {
1da177e4	460	return -EBUSY;
a0800f6d	461	}
1da177e4 LT	462
	463	/* Activate */
	464	pcipcwd_start();
	465	pcipcwd_keepalive();
	466	return nonseekable_open(inode, file);
	467	}
	468
	469	static int pcipcwd_release(struct inode inode, struct file file)
	470	{
	471	/*
	472	* Shut off the timer.
	473	*/
	474	if (expect_release == 42) {
	475	pcipcwd_stop();
	476	} else {
	477	printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
	478	pcipcwd_keepalive();
	479	}
	480	expect_release = 0;
	481	clear_bit(0, &is_active);
	482	return 0;
	483	}
	484
	485	/*
	486	* /dev/temperature handling
	487	*/
	488
	489	static ssize_t pcipcwd_temp_read(struct file file, char __user data,
	490	size_t len, loff_t *ppos)
	491	{
	492	int temperature;
	493
	494	if (pcipcwd_get_temperature(&temperature))
	495	return -EFAULT;
	496
	497	if (copy_to_user (data, &temperature, 1))
	498	return -EFAULT;
	499
	500	return 1;
	501	}
	502
	503	static int pcipcwd_temp_open(struct inode inode, struct file file)
	504	{
	505	if (!pcipcwd_private.supports_temp)
	506	return -ENODEV;
	507
	508	return nonseekable_open(inode, file);
	509	}
	510
	511	static int pcipcwd_temp_release(struct inode inode, struct file file)
	512	{
	513	return 0;
	514	}
	515
	516	/*
	517	* Notify system
	518	*/
	519
	520	static int pcipcwd_notify_sys(struct notifier_block this, unsigned long code, void unused)
	521	{
	522	if (code==SYS_DOWN \|\| code==SYS_HALT) {
	523	/* Turn the WDT off */
	524	pcipcwd_stop();
	525	}
526
527	return NOTIFY_DONE;
528	}
529
530	/*
531	* Kernel Interfaces
532	*/
533
534	static struct file_operations pcipcwd_fops = {
535	.owner = THIS_MODULE,
536	.llseek = no_llseek,
537	.write = pcipcwd_write,
538	.ioctl = pcipcwd_ioctl,
539	.open = pcipcwd_open,
540	.release = pcipcwd_release,
541	};
542
543	static struct miscdevice pcipcwd_miscdev = {
544	.minor = WATCHDOG_MINOR,
545	.name = "watchdog",
546	.fops = &pcipcwd_fops,
547	};
548
549	static struct file_operations pcipcwd_temp_fops = {
550	.owner = THIS_MODULE,
551	.llseek = no_llseek,
552	.read = pcipcwd_temp_read,
553	.open = pcipcwd_temp_open,
554	.release = pcipcwd_temp_release,
555	};
556
557	static struct miscdevice pcipcwd_temp_miscdev = {
558	.minor = TEMP_MINOR,
559	.name = "temperature",
560	.fops = &pcipcwd_temp_fops,
561	};
562
563	static struct notifier_block pcipcwd_notifier = {
564	.notifier_call = pcipcwd_notify_sys,
565	};
566
567	/*
568	* Init & exit routines
569	*/
570
1da177e4 LT	571	static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
	572	const struct pci_device_id *ent)
	573	{
	574	int ret = -EIO;
1da177e4 LT	575
	576	cards_found++;
	577	if (cards_found == 1)
	578	printk(KERN_INFO PFX DRIVER_VERSION);
	579
	580	if (cards_found > 1) {
	581	printk(KERN_ERR PFX "This driver only supports 1 device\n");
	582	return -ENODEV;
	583	}
	584
	585	if (pci_enable_device(pdev)) {
	586	printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
	587	return -ENODEV;
	588	}
	589
	590	if (pci_resource_start(pdev, 0) == 0x0000) {
	591	printk(KERN_ERR PFX "No I/O-Address for card detected\n");
	592	ret = -ENODEV;
	593	goto err_out_disable_device;
	594	}
	595
	596	pcipcwd_private.pdev = pdev;
	597	pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
	598
	599	if (pci_request_regions(pdev, WATCHDOG_NAME)) {
	600	printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
	601	(int) pcipcwd_private.io_addr);
	602	ret = -EIO;
	603	goto err_out_disable_device;
	604	}
	605
	606	/* get the boot_status */
	607	pcipcwd_get_status(&pcipcwd_private.boot_status);
	608
	609	/* clear the "card caused reboot" flag */
	610	pcipcwd_clear_status();
	611
	612	/* disable card */
	613	pcipcwd_stop();
	614
	615	/* Check whether or not the card supports the temperature device */
a0800f6d	616	pcipcwd_check_temperature_support();
1da177e4	617
a0800f6d WVS	618	/* Show info about the card itself */
a0800f6d WVS	619	pcipcwd_show_card_info();
1da177e4 LT	620
	621	/* Check that the heartbeat value is within it's range ; if not reset to the default */
	622	if (pcipcwd_set_heartbeat(heartbeat)) {
	623	pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
	624	printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
	625	WATCHDOG_HEARTBEAT);
	626	}
	627
	628	ret = register_reboot_notifier(&pcipcwd_notifier);
	629	if (ret != 0) {
	630	printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
	631	ret);
	632	goto err_out_release_region;
	633	}
	634
	635	if (pcipcwd_private.supports_temp) {
	636	ret = misc_register(&pcipcwd_temp_miscdev);
	637	if (ret != 0) {
	638	printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
	639	TEMP_MINOR, ret);
	640	goto err_out_unregister_reboot;
	641	}
	642	}
	643
	644	ret = misc_register(&pcipcwd_miscdev);
	645	if (ret != 0) {
	646	printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
	647	WATCHDOG_MINOR, ret);
	648	goto err_out_misc_deregister;
	649	}
	650
	651	printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
	652	heartbeat, nowayout);
	653
	654	return 0;
	655
	656	err_out_misc_deregister:
	657	if (pcipcwd_private.supports_temp)
	658	misc_deregister(&pcipcwd_temp_miscdev);
	659	err_out_unregister_reboot:
	660	unregister_reboot_notifier(&pcipcwd_notifier);
	661	err_out_release_region:
	662	pci_release_regions(pdev);
	663	err_out_disable_device:
	664	pci_disable_device(pdev);
	665	return ret;
	666	}
	667
	668	static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
	669	{
	670	/* Stop the timer before we leave */
	671	if (!nowayout)
	672	pcipcwd_stop();
	673
	674	/* Deregister */
	675	misc_deregister(&pcipcwd_miscdev);
	676	if (pcipcwd_private.supports_temp)
	677	misc_deregister(&pcipcwd_temp_miscdev);
	678	unregister_reboot_notifier(&pcipcwd_notifier);
	679	pci_release_regions(pdev);
	680	pci_disable_device(pdev);
	681	cards_found--;
	682	}
	683
684	static struct pci_device_id pcipcwd_pci_tbl[] = {
685	{ PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
686	PCI_ANY_ID, PCI_ANY_ID, },
687	{ 0 }, /* End of list */
688	};
689	MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
690
691	static struct pci_driver pcipcwd_driver = {
692	.name = WATCHDOG_NAME,
693	.id_table = pcipcwd_pci_tbl,
694	.probe = pcipcwd_card_init,
695	.remove = __devexit_p(pcipcwd_card_exit),
696	};
697
698	static int __init pcipcwd_init_module(void)
699	{
a0800f6d	700	spin_lock_init(&pcipcwd_private.io_lock);
1da177e4 LT	701
	702	return pci_register_driver(&pcipcwd_driver);
	703	}
	704
	705	static void __exit pcipcwd_cleanup_module(void)
	706	{
	707	pci_unregister_driver(&pcipcwd_driver);
	708	}
	709
	710	module_init(pcipcwd_init_module);
	711	module_exit(pcipcwd_cleanup_module);
	712
	713	MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
	714	MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
	715	MODULE_LICENSE("GPL");
	716	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
	717	MODULE_ALIAS_MISCDEV(TEMP_MINOR);