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/drivers/char/watchdog/wdt_pci.c

https://bitbucket.org/evzijst/gittest
C | 763 lines | 432 code | 112 blank | 219 comment | 45 complexity | e2de67a04b0658114163f41920bbe493 MD5 | raw file
  1/*
  2 *	Industrial Computer Source PCI-WDT500/501 driver
  3 *
  4 *	(c) Copyright 1996-1997 Alan Cox <alan@redhat.com>, All Rights Reserved.
  5 *				http://www.redhat.com
  6 *
  7 *	This program is free software; you can redistribute it and/or
  8 *	modify it under the terms of the GNU General Public License
  9 *	as published by the Free Software Foundation; either version
 10 *	2 of the License, or (at your option) any later version.
 11 *
 12 *	Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
 13 *	warranty for any of this software. This material is provided
 14 *	"AS-IS" and at no charge.
 15 *
 16 *	(c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>
 17 *
 18 *	Release 0.10.
 19 *
 20 *	Fixes
 21 *		Dave Gregorich	:	Modularisation and minor bugs
 22 *		Alan Cox	:	Added the watchdog ioctl() stuff
 23 *		Alan Cox	:	Fixed the reboot problem (as noted by
 24 *					Matt Crocker).
 25 *		Alan Cox	:	Added wdt= boot option
 26 *		Alan Cox	:	Cleaned up copy/user stuff
 27 *		Tim Hockin	:	Added insmod parameters, comment cleanup
 28 *					Parameterized timeout
 29 *		JP Nollmann	:	Added support for PCI wdt501p
 30 *		Alan Cox	:	Split ISA and PCI cards into two drivers
 31 *		Jeff Garzik	:	PCI cleanups
 32 *		Tigran Aivazian	:	Restructured wdtpci_init_one() to handle failures
 33 *		Joel Becker 	:	Added WDIOC_GET/SETTIMEOUT
 34 *		Zwane Mwaikambo	:	Magic char closing, locking changes, cleanups
 35 *		Matt Domsch	:	nowayout module option
 36 */
 37
 38#include <linux/config.h>
 39#include <linux/interrupt.h>
 40#include <linux/module.h>
 41#include <linux/moduleparam.h>
 42#include <linux/types.h>
 43#include <linux/miscdevice.h>
 44#include <linux/watchdog.h>
 45#include <linux/ioport.h>
 46#include <linux/notifier.h>
 47#include <linux/reboot.h>
 48#include <linux/init.h>
 49#include <linux/fs.h>
 50#include <linux/pci.h>
 51
 52#include <asm/io.h>
 53#include <asm/uaccess.h>
 54#include <asm/system.h>
 55
 56#define WDT_IS_PCI
 57#include "wd501p.h"
 58
 59#define PFX "wdt_pci: "
 60
 61/*
 62 * Until Access I/O gets their application for a PCI vendor ID approved,
 63 * I don't think that it's appropriate to move these constants into the
 64 * regular pci_ids.h file. -- JPN 2000/01/18
 65 */
 66
 67#ifndef PCI_VENDOR_ID_ACCESSIO
 68#define PCI_VENDOR_ID_ACCESSIO 0x494f
 69#endif
 70#ifndef PCI_DEVICE_ID_WDG_CSM
 71#define PCI_DEVICE_ID_WDG_CSM 0x22c0
 72#endif
 73
 74/* We can only use 1 card due to the /dev/watchdog restriction */
 75static int dev_count;
 76
 77static struct semaphore open_sem;
 78static spinlock_t wdtpci_lock;
 79static char expect_close;
 80
 81static int io;
 82static int irq;
 83
 84/* Default timeout */
 85#define WD_TIMO 60			/* Default heartbeat = 60 seconds */
 86
 87static int heartbeat = WD_TIMO;
 88static int wd_heartbeat;
 89module_param(heartbeat, int, 0);
 90MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")");
 91
 92#ifdef CONFIG_WATCHDOG_NOWAYOUT
 93static int nowayout = 1;
 94#else
 95static int nowayout = 0;
 96#endif
 97
 98module_param(nowayout, int, 0);
 99MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
100
101#ifdef CONFIG_WDT_501_PCI
102/* Support for the Fan Tachometer on the PCI-WDT501 */
103static int tachometer;
104
105module_param(tachometer, int, 0);
106MODULE_PARM_DESC(tachometer, "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
107#endif /* CONFIG_WDT_501_PCI */
108
109/*
110 *	Programming support
111 */
112
113static void wdtpci_ctr_mode(int ctr, int mode)
114{
115	ctr<<=6;
116	ctr|=0x30;
117	ctr|=(mode<<1);
118	outb_p(ctr, WDT_CR);
119}
120
121static void wdtpci_ctr_load(int ctr, int val)
122{
123	outb_p(val&0xFF, WDT_COUNT0+ctr);
124	outb_p(val>>8, WDT_COUNT0+ctr);
125}
126
127/**
128 *	wdtpci_start:
129 *
130 *	Start the watchdog driver.
131 */
132
133static int wdtpci_start(void)
134{
135	unsigned long flags;
136
137	spin_lock_irqsave(&wdtpci_lock, flags);
138
139	/*
140	 * "pet" the watchdog, as Access says.
141	 * This resets the clock outputs.
142	 */
143	inb_p(WDT_DC);			/* Disable watchdog */
144	wdtpci_ctr_mode(2,0);		/* Program CTR2 for Mode 0: Pulse on Terminal Count */
145	outb_p(0, WDT_DC);		/* Enable watchdog */
146
147	inb_p(WDT_DC);			/* Disable watchdog */
148	outb_p(0, WDT_CLOCK);		/* 2.0833MHz clock */
149	inb_p(WDT_BUZZER);		/* disable */
150	inb_p(WDT_OPTONOTRST);		/* disable */
151	inb_p(WDT_OPTORST);		/* disable */
152	inb_p(WDT_PROGOUT);		/* disable */
153	wdtpci_ctr_mode(0,3);		/* Program CTR0 for Mode 3: Square Wave Generator */
154	wdtpci_ctr_mode(1,2);		/* Program CTR1 for Mode 2: Rate Generator */
155	wdtpci_ctr_mode(2,1);		/* Program CTR2 for Mode 1: Retriggerable One-Shot */
156	wdtpci_ctr_load(0,20833);	/* count at 100Hz */
157	wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */
158	/* DO NOT LOAD CTR2 on PCI card! -- JPN */
159	outb_p(0, WDT_DC);		/* Enable watchdog */
160
161	spin_unlock_irqrestore(&wdtpci_lock, flags);
162	return 0;
163}
164
165/**
166 *	wdtpci_stop:
167 *
168 *	Stop the watchdog driver.
169 */
170
171static int wdtpci_stop (void)
172{
173	unsigned long flags;
174
175	/* Turn the card off */
176	spin_lock_irqsave(&wdtpci_lock, flags);
177	inb_p(WDT_DC);			/* Disable watchdog */
178	wdtpci_ctr_load(2,0);		/* 0 length reset pulses now */
179	spin_unlock_irqrestore(&wdtpci_lock, flags);
180	return 0;
181}
182
183/**
184 *	wdtpci_ping:
185 *
186 *	Reload counter one with the watchdog heartbeat. We don't bother reloading
187 *	the cascade counter.
188 */
189
190static int wdtpci_ping(void)
191{
192	unsigned long flags;
193
194	/* Write a watchdog value */
195	spin_lock_irqsave(&wdtpci_lock, flags);
196	inb_p(WDT_DC);			/* Disable watchdog */
197	wdtpci_ctr_mode(1,2);		/* Re-Program CTR1 for Mode 2: Rate Generator */
198	wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */
199	outb_p(0, WDT_DC);		/* Enable watchdog */
200	spin_unlock_irqrestore(&wdtpci_lock, flags);
201	return 0;
202}
203
204/**
205 *	wdtpci_set_heartbeat:
206 *	@t:		the new heartbeat value that needs to be set.
207 *
208 *	Set a new heartbeat value for the watchdog device. If the heartbeat value is
209 *	incorrect we keep the old value and return -EINVAL. If successfull we
210 *	return 0.
211 */
212static int wdtpci_set_heartbeat(int t)
213{
214	/* Arbitrary, can't find the card's limits */
215	if ((t < 1) || (t > 65535))
216		return -EINVAL;
217
218	heartbeat = t;
219	wd_heartbeat = t * 100;
220	return 0;
221}
222
223/**
224 *	wdtpci_get_status:
225 *	@status:		the new status.
226 *
227 *	Extract the status information from a WDT watchdog device. There are
228 *	several board variants so we have to know which bits are valid. Some
229 *	bits default to one and some to zero in order to be maximally painful.
230 *
231 *	we then map the bits onto the status ioctl flags.
232 */
233
234static int wdtpci_get_status(int *status)
235{
236	unsigned char new_status=inb_p(WDT_SR);
237
238	*status=0;
239	if (new_status & WDC_SR_ISOI0)
240		*status |= WDIOF_EXTERN1;
241	if (new_status & WDC_SR_ISII1)
242		*status |= WDIOF_EXTERN2;
243#ifdef CONFIG_WDT_501_PCI
244	if (!(new_status & WDC_SR_TGOOD))
245		*status |= WDIOF_OVERHEAT;
246	if (!(new_status & WDC_SR_PSUOVER))
247		*status |= WDIOF_POWEROVER;
248	if (!(new_status & WDC_SR_PSUUNDR))
249		*status |= WDIOF_POWERUNDER;
250	if (tachometer) {
251		if (!(new_status & WDC_SR_FANGOOD))
252			*status |= WDIOF_FANFAULT;
253	}
254#endif /* CONFIG_WDT_501_PCI */
255	return 0;
256}
257
258#ifdef CONFIG_WDT_501_PCI
259/**
260 *	wdtpci_get_temperature:
261 *
262 *	Reports the temperature in degrees Fahrenheit. The API is in
263 *	farenheit. It was designed by an imperial measurement luddite.
264 */
265
266static int wdtpci_get_temperature(int *temperature)
267{
268	unsigned short c=inb_p(WDT_RT);
269
270	*temperature = (c * 11 / 15) + 7;
271	return 0;
272}
273#endif /* CONFIG_WDT_501_PCI */
274
275/**
276 *	wdtpci_interrupt:
277 *	@irq:		Interrupt number
278 *	@dev_id:	Unused as we don't allow multiple devices.
279 *	@regs:		Unused.
280 *
281 *	Handle an interrupt from the board. These are raised when the status
282 *	map changes in what the board considers an interesting way. That means
283 *	a failure condition occurring.
284 */
285
286static irqreturn_t wdtpci_interrupt(int irq, void *dev_id, struct pt_regs *regs)
287{
288	/*
289	 *	Read the status register see what is up and
290	 *	then printk it.
291	 */
292	unsigned char status=inb_p(WDT_SR);
293
294	printk(KERN_CRIT PFX "status %d\n", status);
295
296#ifdef CONFIG_WDT_501_PCI
297	if (!(status & WDC_SR_TGOOD))
298 		printk(KERN_CRIT PFX "Overheat alarm.(%d)\n",inb_p(WDT_RT));
299	if (!(status & WDC_SR_PSUOVER))
300 		printk(KERN_CRIT PFX "PSU over voltage.\n");
301	if (!(status & WDC_SR_PSUUNDR))
302 		printk(KERN_CRIT PFX "PSU under voltage.\n");
303	if (tachometer) {
304		if (!(status & WDC_SR_FANGOOD))
305			printk(KERN_CRIT PFX "Possible fan fault.\n");
306	}
307#endif /* CONFIG_WDT_501_PCI */
308	if (!(status&WDC_SR_WCCR))
309#ifdef SOFTWARE_REBOOT
310#ifdef ONLY_TESTING
311		printk(KERN_CRIT PFX "Would Reboot.\n");
312#else
313		printk(KERN_CRIT PFX "Initiating system reboot.\n");
314		machine_restart(NULL);
315#endif
316#else
317		printk(KERN_CRIT PFX "Reset in 5ms.\n");
318#endif
319	return IRQ_HANDLED;
320}
321
322
323/**
324 *	wdtpci_write:
325 *	@file: file handle to the watchdog
326 *	@buf: buffer to write (unused as data does not matter here
327 *	@count: count of bytes
328 *	@ppos: pointer to the position to write. No seeks allowed
329 *
330 *	A write to a watchdog device is defined as a keepalive signal. Any
331 *	write of data will do, as we we don't define content meaning.
332 */
333
334static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
335{
336	if (count) {
337		if (!nowayout) {
338			size_t i;
339
340			expect_close = 0;
341
342			for (i = 0; i != count; i++) {
343				char c;
344				if(get_user(c, buf+i))
345					return -EFAULT;
346				if (c == 'V')
347					expect_close = 42;
348			}
349		}
350		wdtpci_ping();
351	}
352
353	return count;
354}
355
356/**
357 *	wdtpci_ioctl:
358 *	@inode: inode of the device
359 *	@file: file handle to the device
360 *	@cmd: watchdog command
361 *	@arg: argument pointer
362 *
363 *	The watchdog API defines a common set of functions for all watchdogs
364 *	according to their available features. We only actually usefully support
365 *	querying capabilities and current status.
366 */
367
368static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
369	unsigned long arg)
370{
371	int new_heartbeat;
372	int status;
373	void __user *argp = (void __user *)arg;
374	int __user *p = argp;
375
376	static struct watchdog_info ident = {
377		.options =		WDIOF_SETTIMEOUT|
378					WDIOF_MAGICCLOSE|
379					WDIOF_KEEPALIVEPING,
380		.firmware_version =	1,
381		.identity =		"PCI-WDT500/501",
382	};
383
384	/* Add options according to the card we have */
385	ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
386#ifdef CONFIG_WDT_501_PCI
387	ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER);
388	if (tachometer)
389		ident.options |= WDIOF_FANFAULT;
390#endif /* CONFIG_WDT_501_PCI */
391
392	switch(cmd)
393	{
394		default:
395			return -ENOIOCTLCMD;
396		case WDIOC_GETSUPPORT:
397			return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0;
398
399		case WDIOC_GETSTATUS:
400			wdtpci_get_status(&status);
401			return put_user(status, p);
402		case WDIOC_GETBOOTSTATUS:
403			return put_user(0, p);
404		case WDIOC_KEEPALIVE:
405			wdtpci_ping();
406			return 0;
407		case WDIOC_SETTIMEOUT:
408			if (get_user(new_heartbeat, p))
409				return -EFAULT;
410
411			if (wdtpci_set_heartbeat(new_heartbeat))
412				return -EINVAL;
413
414			wdtpci_ping();
415			/* Fall */
416		case WDIOC_GETTIMEOUT:
417			return put_user(heartbeat, p);
418	}
419}
420
421/**
422 *	wdtpci_open:
423 *	@inode: inode of device
424 *	@file: file handle to device
425 *
426 *	The watchdog device has been opened. The watchdog device is single
427 *	open and on opening we load the counters. Counter zero is a 100Hz
428 *	cascade, into counter 1 which downcounts to reboot. When the counter
429 *	triggers counter 2 downcounts the length of the reset pulse which
430 *	set set to be as long as possible.
431 */
432
433static int wdtpci_open(struct inode *inode, struct file *file)
434{
435	if (down_trylock(&open_sem))
436		return -EBUSY;
437
438	if (nowayout) {
439		__module_get(THIS_MODULE);
440	}
441	/*
442	 *	Activate
443	 */
444	wdtpci_start();
445	return nonseekable_open(inode, file);
446}
447
448/**
449 *	wdtpci_release:
450 *	@inode: inode to board
451 *	@file: file handle to board
452 *
453 *	The watchdog has a configurable API. There is a religious dispute
454 *	between people who want their watchdog to be able to shut down and
455 *	those who want to be sure if the watchdog manager dies the machine
456 *	reboots. In the former case we disable the counters, in the latter
457 *	case you have to open it again very soon.
458 */
459
460static int wdtpci_release(struct inode *inode, struct file *file)
461{
462	if (expect_close == 42) {
463		wdtpci_stop();
464	} else {
465		printk(KERN_CRIT PFX "Unexpected close, not stopping timer!");
466		wdtpci_ping();
467	}
468	expect_close = 0;
469	up(&open_sem);
470	return 0;
471}
472
473#ifdef CONFIG_WDT_501_PCI
474/**
475 *	wdtpci_temp_read:
476 *	@file: file handle to the watchdog board
477 *	@buf: buffer to write 1 byte into
478 *	@count: length of buffer
479 *	@ptr: offset (no seek allowed)
480 *
481 *	Read reports the temperature in degrees Fahrenheit. The API is in
482 *	fahrenheit. It was designed by an imperial measurement luddite.
483 */
484
485static ssize_t wdtpci_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr)
486{
487	int temperature;
488
489	if (wdtpci_get_temperature(&temperature))
490		return -EFAULT;
491
492	if (copy_to_user (buf, &temperature, 1))
493		return -EFAULT;
494
495	return 1;
496}
497
498/**
499 *	wdtpci_temp_open:
500 *	@inode: inode of device
501 *	@file: file handle to device
502 *
503 *	The temperature device has been opened.
504 */
505
506static int wdtpci_temp_open(struct inode *inode, struct file *file)
507{
508	return nonseekable_open(inode, file);
509}
510
511/**
512 *	wdtpci_temp_release:
513 *	@inode: inode to board
514 *	@file: file handle to board
515 *
516 *	The temperature device has been closed.
517 */
518
519static int wdtpci_temp_release(struct inode *inode, struct file *file)
520{
521	return 0;
522}
523#endif /* CONFIG_WDT_501_PCI */
524
525/**
526 *	notify_sys:
527 *	@this: our notifier block
528 *	@code: the event being reported
529 *	@unused: unused
530 *
531 *	Our notifier is called on system shutdowns. We want to turn the card
532 *	off at reboot otherwise the machine will reboot again during memory
533 *	test or worse yet during the following fsck. This would suck, in fact
534 *	trust me - if it happens it does suck.
535 */
536
537static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
538	void *unused)
539{
540	if (code==SYS_DOWN || code==SYS_HALT) {
541		/* Turn the card off */
542		wdtpci_stop();
543	}
544	return NOTIFY_DONE;
545}
546
547/*
548 *	Kernel Interfaces
549 */
550
551
552static struct file_operations wdtpci_fops = {
553	.owner		= THIS_MODULE,
554	.llseek		= no_llseek,
555	.write		= wdtpci_write,
556	.ioctl		= wdtpci_ioctl,
557	.open		= wdtpci_open,
558	.release	= wdtpci_release,
559};
560
561static struct miscdevice wdtpci_miscdev = {
562	.minor	= WATCHDOG_MINOR,
563	.name	= "watchdog",
564	.fops	= &wdtpci_fops,
565};
566
567#ifdef CONFIG_WDT_501_PCI
568static struct file_operations wdtpci_temp_fops = {
569	.owner		= THIS_MODULE,
570	.llseek		= no_llseek,
571	.read		= wdtpci_temp_read,
572	.open		= wdtpci_temp_open,
573	.release	= wdtpci_temp_release,
574};
575
576static struct miscdevice temp_miscdev = {
577	.minor	= TEMP_MINOR,
578	.name	= "temperature",
579	.fops	= &wdtpci_temp_fops,
580};
581#endif /* CONFIG_WDT_501_PCI */
582
583/*
584 *	The WDT card needs to learn about soft shutdowns in order to
585 *	turn the timebomb registers off.
586 */
587
588static struct notifier_block wdtpci_notifier = {
589	.notifier_call = wdtpci_notify_sys,
590};
591
592
593static int __devinit wdtpci_init_one (struct pci_dev *dev,
594				   const struct pci_device_id *ent)
595{
596	int ret = -EIO;
597
598	dev_count++;
599	if (dev_count > 1) {
600		printk (KERN_ERR PFX "this driver only supports 1 device\n");
601		return -ENODEV;
602	}
603
604	if (pci_enable_device (dev)) {
605		printk (KERN_ERR PFX "Not possible to enable PCI Device\n");
606		return -ENODEV;
607	}
608
609	if (pci_resource_start (dev, 2) == 0x0000) {
610		printk (KERN_ERR PFX "No I/O-Address for card detected\n");
611		ret = -ENODEV;
612		goto out_pci;
613	}
614
615	sema_init(&open_sem, 1);
616	spin_lock_init(&wdtpci_lock);
617
618	irq = dev->irq;
619	io = pci_resource_start (dev, 2);
620
621	if (request_region (io, 16, "wdt_pci") == NULL) {
622		printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", io);
623		goto out_pci;
624	}
625
626	if (request_irq (irq, wdtpci_interrupt, SA_INTERRUPT | SA_SHIRQ,
627			 "wdt_pci", &wdtpci_miscdev)) {
628		printk (KERN_ERR PFX "IRQ %d is not free\n", irq);
629		goto out_reg;
630	}
631
632	printk ("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n",
633		io, irq);
634
635	/* Check that the heartbeat value is within it's range ; if not reset to the default */
636	if (wdtpci_set_heartbeat(heartbeat)) {
637		wdtpci_set_heartbeat(WD_TIMO);
638		printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
639			WD_TIMO);
640	}
641
642	ret = register_reboot_notifier (&wdtpci_notifier);
643	if (ret) {
644		printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", ret);
645		goto out_irq;
646	}
647
648#ifdef CONFIG_WDT_501_PCI
649	ret = misc_register (&temp_miscdev);
650	if (ret) {
651		printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
652			TEMP_MINOR, ret);
653		goto out_rbt;
654	}
655#endif /* CONFIG_WDT_501_PCI */
656
657	ret = misc_register (&wdtpci_miscdev);
658	if (ret) {
659		printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
660			WATCHDOG_MINOR, ret);
661		goto out_misc;
662	}
663
664	printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
665		heartbeat, nowayout);
666#ifdef CONFIG_WDT_501_PCI
667	printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled"));
668#endif /* CONFIG_WDT_501_PCI */
669
670	ret = 0;
671out:
672	return ret;
673
674out_misc:
675#ifdef CONFIG_WDT_501_PCI
676	misc_deregister(&temp_miscdev);
677out_rbt:
678#endif /* CONFIG_WDT_501_PCI */
679	unregister_reboot_notifier(&wdtpci_notifier);
680out_irq:
681	free_irq(irq, &wdtpci_miscdev);
682out_reg:
683	release_region (io, 16);
684out_pci:
685	pci_disable_device(dev);
686	goto out;
687}
688
689
690static void __devexit wdtpci_remove_one (struct pci_dev *pdev)
691{
692	/* here we assume only one device will ever have
693	 * been picked up and registered by probe function */
694	misc_deregister(&wdtpci_miscdev);
695#ifdef CONFIG_WDT_501_PCI
696	misc_deregister(&temp_miscdev);
697#endif /* CONFIG_WDT_501_PCI */
698	unregister_reboot_notifier(&wdtpci_notifier);
699	free_irq(irq, &wdtpci_miscdev);
700	release_region(io, 16);
701	pci_disable_device(pdev);
702	dev_count--;
703}
704
705
706static struct pci_device_id wdtpci_pci_tbl[] = {
707	{
708		.vendor	   = PCI_VENDOR_ID_ACCESSIO,
709		.device	   = PCI_DEVICE_ID_WDG_CSM,
710		.subvendor = PCI_ANY_ID,
711		.subdevice = PCI_ANY_ID,
712	},
713	{ 0, }, /* terminate list */
714};
715MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
716
717
718static struct pci_driver wdtpci_driver = {
719	.name		= "wdt_pci",
720	.id_table	= wdtpci_pci_tbl,
721	.probe		= wdtpci_init_one,
722	.remove		= __devexit_p(wdtpci_remove_one),
723};
724
725
726/**
727 *	wdtpci_cleanup:
728 *
729 *	Unload the watchdog. You cannot do this with any file handles open.
730 *	If your watchdog is set to continue ticking on close and you unload
731 *	it, well it keeps ticking. We won't get the interrupt but the board
732 *	will not touch PC memory so all is fine. You just have to load a new
733 *	module in xx seconds or reboot.
734 */
735
736static void __exit wdtpci_cleanup(void)
737{
738	pci_unregister_driver (&wdtpci_driver);
739}
740
741
742/**
743 * 	wdtpci_init:
744 *
745 *	Set up the WDT watchdog board. All we have to do is grab the
746 *	resources we require and bitch if anyone beat us to them.
747 *	The open() function will actually kick the board off.
748 */
749
750static int __init wdtpci_init(void)
751{
752	return pci_register_driver (&wdtpci_driver);
753}
754
755
756module_init(wdtpci_init);
757module_exit(wdtpci_cleanup);
758
759MODULE_AUTHOR("JP Nollmann, Alan Cox");
760MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
761MODULE_LICENSE("GPL");
762MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
763MODULE_ALIAS_MISCDEV(TEMP_MINOR);