aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/watchdog/wdt_pci.c
blob: 7a1bdc7c95a98fdbcc7a897190b4b7634b2e2e85 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
/*
 *	Industrial Computer Source PCI-WDT500/501 driver
 *
 *	(c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>,
 *						All Rights Reserved.
 *
 *	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 Alan Cox nor CymruNet Ltd. admit liability nor provide
 *	warranty for any of this software. This material is provided
 *	"AS-IS" and at no charge.
 *
 *	(c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>
 *
 *	Release 0.10.
 *
 *	Fixes
 *		Dave Gregorich	:	Modularisation and minor bugs
 *		Alan Cox	:	Added the watchdog ioctl() stuff
 *		Alan Cox	:	Fixed the reboot problem (as noted by
 *					Matt Crocker).
 *		Alan Cox	:	Added wdt= boot option
 *		Alan Cox	:	Cleaned up copy/user stuff
 *		Tim Hockin	:	Added insmod parameters, comment cleanup
 *					Parameterized timeout
 *		JP Nollmann	:	Added support for PCI wdt501p
 *		Alan Cox	:	Split ISA and PCI cards into two drivers
 *		Jeff Garzik	:	PCI cleanups
 *		Tigran Aivazian	:	Restructured wdtpci_init_one() to handle
 *					failures
 *		Joel Becker 	:	Added WDIOC_GET/SETTIMEOUT
 *		Zwane Mwaikambo	:	Magic char closing, locking changes,
 *					cleanups
 *		Matt Domsch	:	nowayout module option
 */

#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/pci.h>
#include <linux/io.h>
#include <linux/uaccess.h>

#include <asm/system.h>

#define WDT_IS_PCI
#include "wd501p.h"

#define PFX "wdt_pci: "

/*
 * Until Access I/O gets their application for a PCI vendor ID approved,
 * I don't think that it's appropriate to move these constants into the
 * regular pci_ids.h file. -- JPN 2000/01/18
 */

#ifndef PCI_VENDOR_ID_ACCESSIO
#define PCI_VENDOR_ID_ACCESSIO 0x494f
#endif
#ifndef PCI_DEVICE_ID_WDG_CSM
#define PCI_DEVICE_ID_WDG_CSM 0x22c0
#endif

/* We can only use 1 card due to the /dev/watchdog restriction */
static int dev_count;

static unsigned long open_lock;
static DEFINE_SPINLOCK(wdtpci_lock);
static char expect_close;

static int io;
static int irq;

/* Default timeout */
#define WD_TIMO 60			/* Default heartbeat = 60 seconds */

static int heartbeat = WD_TIMO;
static int wd_heartbeat;
module_param(heartbeat, int, 0);
MODULE_PARM_DESC(heartbeat,
		"Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
				__MODULE_STRING(WD_TIMO) ")");

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) ")");

/* Support for the Fan Tachometer on the PCI-WDT501 */
static int tachometer;
module_param(tachometer, int, 0);
MODULE_PARM_DESC(tachometer,
		"PCI-WDT501 Fan Tachometer support (0=disable, default=0)");

static int type = 500;
module_param(type, int, 0);
MODULE_PARM_DESC(type,
		"PCI-WDT501 Card type (500 or 501 , default=500)");

/*
 *	Programming support
 */

static void wdtpci_ctr_mode(int ctr, int mode)
{
	ctr <<= 6;
	ctr |= 0x30;
	ctr |= (mode << 1);
	outb(ctr, WDT_CR);
	udelay(8);
}

static void wdtpci_ctr_load(int ctr, int val)
{
	outb(val & 0xFF, WDT_COUNT0 + ctr);
	udelay(8);
	outb(val >> 8, WDT_COUNT0 + ctr);
	udelay(8);
}

/**
 *	wdtpci_start:
 *
 *	Start the watchdog driver.
 */

static int wdtpci_start(void)
{
	unsigned long flags;

	spin_lock_irqsave(&wdtpci_lock, flags);

	/*
	 * "pet" the watchdog, as Access says.
	 * This resets the clock outputs.
	 */
	inb(WDT_DC);			/* Disable watchdog */
	udelay(8);
	wdtpci_ctr_mode(2, 0);		/* Program CTR2 for Mode 0:
						Pulse on Terminal Count */
	outb(0, WDT_DC);		/* Enable watchdog */
	udelay(8);
	inb(WDT_DC);			/* Disable watchdog */
	udelay(8);
	outb(0, WDT_CLOCK);		/* 2.0833MHz clock */
	udelay(8);
	inb(WDT_BUZZER);		/* disable */
	udelay(8);
	inb(WDT_OPTONOTRST);		/* disable */
	udelay(8);
	inb(WDT_OPTORST);		/* disable */
	udelay(8);
	inb(WDT_PROGOUT);		/* disable */
	udelay(8);
	wdtpci_ctr_mode(0, 3);		/* Program CTR0 for Mode 3:
						Square Wave Generator */
	wdtpci_ctr_mode(1, 2);		/* Program CTR1 for Mode 2:
						Rate Generator */
	wdtpci_ctr_mode(2, 1);		/* Program CTR2 for Mode 1:
						Retriggerable One-Shot */
	wdtpci_ctr_load(0, 20833);	/* count at 100Hz */
	wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
	/* DO NOT LOAD CTR2 on PCI card! -- JPN */
	outb(0, WDT_DC);		/* Enable watchdog */
	udelay(8);

	spin_unlock_irqrestore(&wdtpci_lock, flags);
	return 0;
}

/**
 *	wdtpci_stop:
 *
 *	Stop the watchdog driver.
 */

static int wdtpci_stop(void)
{
	unsigned long flags;

	/* Turn the card off */
	spin_lock_irqsave(&wdtpci_lock, flags);
	inb(WDT_DC);			/* Disable watchdog */
	udelay(8);
	wdtpci_ctr_load(2, 0);		/* 0 length reset pulses now */
	spin_unlock_irqrestore(&wdtpci_lock, flags);
	return 0;
}

/**
 *	wdtpci_ping:
 *
 *	Reload counter one with the watchdog heartbeat. We don't bother
 *	reloading the cascade counter.
 */

static int wdtpci_ping(void)
{
	unsigned long flags;

	spin_lock_irqsave(&wdtpci_lock, flags);
	/* Write a watchdog value */
	inb(WDT_DC);			/* Disable watchdog */
	udelay(8);
	wdtpci_ctr_mode(1, 2);		/* Re-Program CTR1 for Mode 2:
							Rate Generator */
	wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
	outb(0, WDT_DC);		/* Enable watchdog */
	udelay(8);
	spin_unlock_irqrestore(&wdtpci_lock, flags);
	return 0;
}

/**
 *	wdtpci_set_heartbeat:
 *	@t:		the new heartbeat value that needs to be set.
 *
 *	Set a new heartbeat value for the watchdog device. If the heartbeat
 *	value is incorrect we keep the old value and return -EINVAL.
 *	If successful we return 0.
 */
static int wdtpci_set_heartbeat(int t)
{
	/* Arbitrary, can't find the card's limits */
	if (t < 1 || t > 65535)
		return -EINVAL;

	heartbeat = t;
	wd_heartbeat = t * 100;
	return 0;
}

/**
 *	wdtpci_get_status:
 *	@status:		the new status.
 *
 *	Extract the status information from a WDT watchdog device. There are
 *	several board variants so we have to know which bits are valid. Some
 *	bits default to one and some to zero in order to be maximally painful.
 *
 *	we then map the bits onto the status ioctl flags.
 */

static int wdtpci_get_status(int *status)
{
	unsigned char new_status;
	unsigned long flags;

	spin_lock_irqsave(&wdtpci_lock, flags);
	new_status = inb(WDT_SR);
	spin_unlock_irqrestore(&wdtpci_lock, flags);

	*status = 0;
	if (new_status & WDC_SR_ISOI0)
		*status |= WDIOF_EXTERN1;
	if (new_status & WDC_SR_ISII1)
		*status |= WDIOF_EXTERN2;
	if (type == 501) {
		if (!(new_status & WDC_SR_TGOOD))
			*status |= WDIOF_OVERHEAT;
		if (!(new_status & WDC_SR_PSUOVER))
			*status |= WDIOF_POWEROVER;
		if (!(new_status & WDC_SR_PSUUNDR))
			*status |= WDIOF_POWERUNDER;
		if (tachometer) {
			if (!(new_status & WDC_SR_FANGOOD))
				*status |= WDIOF_FANFAULT;
		}
	}
	return 0;
}

/**
 *	wdtpci_get_temperature:
 *
 *	Reports the temperature in degrees Fahrenheit. The API is in
 *	farenheit. It was designed by an imperial measurement luddite.
 */

static int wdtpci_get_temperature(int *temperature)
{
	unsigned short c;
	unsigned long flags;
	spin_lock_irqsave(&wdtpci_lock, flags);
	c = inb(WDT_RT);
	udelay(8);
	spin_unlock_irqrestore(&wdtpci_lock, flags);
	*temperature = (c * 11 / 15) + 7;
	return 0;
}

/**
 *	wdtpci_interrupt:
 *	@irq:		Interrupt number
 *	@dev_id:	Unused as we don't allow multiple devices.
 *
 *	Handle an interrupt from the board. These are raised when the status
 *	map changes in what the board considers an interesting way. That means
 *	a failure condition occurring.
 */

static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
{
	/*
	 *	Read the status register see what is up and
	 *	then printk it.
	 */
	unsigned char status;

	spin_lock(&wdtpci_lock);

	status = inb(WDT_SR);
	udelay(8);

	printk(KERN_CRIT PFX "status %d\n", status);

	if (type == 501) {
		if (!(status & WDC_SR_TGOOD)) {
			printk(KERN_CRIT PFX "Overheat alarm.(%d)\n",
								inb(WDT_RT));
			udelay(8);
		}
		if (!(status & WDC_SR_PSUOVER))
			printk(KERN_CRIT PFX "PSU over voltage.\n");
		if (!(status & WDC_SR_PSUUNDR))
			printk(KERN_CRIT PFX "PSU under voltage.\n");
		if (tachometer) {
			if (!(status & WDC_SR_FANGOOD))
				printk(KERN_CRIT PFX "Possible fan fault.\n");
		}
	}
	if (!(status & WDC_SR_WCCR)) {
#ifdef SOFTWARE_REBOOT
#ifdef ONLY_TESTING
		printk(KERN_CRIT PFX "Would Reboot.\n");
#else
		printk(KERN_CRIT PFX "Initiating system reboot.\n");
		emergency_restart(NULL);
#endif
#else
		printk(KERN_CRIT PFX "Reset in 5ms.\n");
#endif
	}
	spin_unlock(&wdtpci_lock);
	return IRQ_HANDLED;
}


/**
 *	wdtpci_write:
 *	@file: file handle to the watchdog
 *	@buf: buffer to write (unused as data does not matter here
 *	@count: count of bytes
 *	@ppos: pointer to the position to write. No seeks allowed
 *
 *	A write to a watchdog device is defined as a keepalive signal. Any
 *	write of data will do, as we we don't define content meaning.
 */

static ssize_t wdtpci_write(struct file *file, const char __user *buf,
						size_t count, loff_t *ppos)
{
	if (count) {
		if (!nowayout) {
			size_t i;

			/* In case it was set long ago */
			expect_close = 0;

			for (i = 0; i != count; i++) {
				char c;
				if (get_user(c, buf + i))
					return -EFAULT;
				if (c == 'V')
					expect_close = 42;
			}
		}
		wdtpci_ping();
	}
	return count;
}

/**
 *	wdtpci_ioctl:
 *	@file: file handle to the device
 *	@cmd: watchdog command
 *	@arg: argument pointer
 *
 *	The watchdog API defines a common set of functions for all watchdogs
 *	according to their available features. We only actually usefully support
 *	querying capabilities and current status.
 */

static long wdtpci_ioctl(struct file *file, unsigned int cmd,
							unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	int __user *p = argp;
	int new_heartbeat;
	int status;

	static struct watchdog_info ident = {
		.options =		WDIOF_SETTIMEOUT|
					WDIOF_MAGICCLOSE|
					WDIOF_KEEPALIVEPING,
		.firmware_version =	1,
		.identity =		"PCI-WDT500/501",
	};

	/* Add options according to the card we have */
	ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
	if (type == 501) {
		ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
							WDIOF_POWEROVER);
		if (tachometer)
			ident.options |= WDIOF_FANFAULT;
	}

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
	case WDIOC_GETSTATUS:
		wdtpci_get_status(&status);
		return put_user(status, p);
	case WDIOC_GETBOOTSTATUS:
		return put_user(0, p);
	case WDIOC_KEEPALIVE:
		wdtpci_ping();
		return 0;
	case WDIOC_SETTIMEOUT:
		if (get_user(new_heartbeat, p))
			return -EFAULT;
		if (wdtpci_set_heartbeat(new_heartbeat))
			return -EINVAL;
		wdtpci_ping();
		/* Fall */
	case WDIOC_GETTIMEOUT:
		return put_user(heartbeat, p);
	default:
		return -ENOTTY;
	}
}

/**
 *	wdtpci_open:
 *	@inode: inode of device
 *	@file: file handle to device
 *
 *	The watchdog device has been opened. The watchdog device is single
 *	open and on opening we load the counters. Counter zero is a 100Hz
 *	cascade, into counter 1 which downcounts to reboot. When the counter
 *	triggers counter 2 downcounts the length of the reset pulse which
 *	set set to be as long as possible.
 */

static int wdtpci_open(struct inode *inode, struct file *file)
{
	if (test_and_set_bit(0, &open_lock))
		return -EBUSY;

	if (nowayout)
		__module_get(THIS_MODULE);
	/*
	 *	Activate
	 */
	wdtpci_start();
	return nonseekable_open(inode, file);
}

/**
 *	wdtpci_release:
 *	@inode: inode to board
 *	@file: file handle to board
 *
 *	The watchdog has a configurable API. There is a religious dispute
 *	between people who want their watchdog to be able to shut down and
 *	those who want to be sure if the watchdog manager dies the machine
 *	reboots. In the former case we disable the counters, in the latter
 *	case you have to open it again very soon.
 */

static int wdtpci_release(struct inode *inode, struct file *file)
{
	if (expect_close == 42) {
		wdtpci_stop();
	} else {
		printk(KERN_CRIT PFX "Unexpected close, not stopping timer!");
		wdtpci_ping();
	}
	expect_close = 0;
	clear_bit(0, &open_lock);
	return 0;
}

/**
 *	wdtpci_temp_read:
 *	@file: file handle to the watchdog board
 *	@buf: buffer to write 1 byte into
 *	@count: length of buffer
 *	@ptr: offset (no seek allowed)
 *
 *	Read reports the temperature in degrees Fahrenheit. The API is in
 *	fahrenheit. It was designed by an imperial measurement luddite.
 */

static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
						size_t count, loff_t *ptr)
{
	int temperature;

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

	if (copy_to_user(buf, &temperature, 1))
		return -EFAULT;

	return 1;
}

/**
 *	wdtpci_temp_open:
 *	@inode: inode of device
 *	@file: file handle to device
 *
 *	The temperature device has been opened.
 */

static int wdtpci_temp_open(struct inode *inode, struct file *file)
{
	return nonseekable_open(inode, file);
}

/**
 *	wdtpci_temp_release:
 *	@inode: inode to board
 *	@file: file handle to board
 *
 *	The temperature device has been closed.
 */

static int wdtpci_temp_release(struct inode *inode, struct file *file)
{
	return 0;
}

/**
 *	notify_sys:
 *	@this: our notifier block
 *	@code: the event being reported
 *	@unused: unused
 *
 *	Our notifier is called on system shutdowns. We want to turn the card
 *	off at reboot otherwise the machine will reboot again during memory
 *	test or worse yet during the following fsck. This would suck, in fact
 *	trust me - if it happens it does suck.
 */

static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
							void *unused)
{
	if (code == SYS_DOWN || code == SYS_HALT)
		wdtpci_stop();
	return NOTIFY_DONE;
}

/*
 *	Kernel Interfaces
 */


static const struct file_operations wdtpci_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.write		= wdtpci_write,
	.unlocked_ioctl	= wdtpci_ioctl,
	.open		= wdtpci_open,
	.release	= wdtpci_release,
};

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

static const struct file_operations wdtpci_temp_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.read		= wdtpci_temp_read,
	.open		= wdtpci_temp_open,
	.release	= wdtpci_temp_release,
};

static struct miscdevice temp_miscdev = {
	.minor	= TEMP_MINOR,
	.name	= "temperature",
	.fops	= &wdtpci_temp_fops,
};

/*
 *	The WDT card needs to learn about soft shutdowns in order to
 *	turn the timebomb registers off.
 */

static struct notifier_block wdtpci_notifier = {
	.notifier_call = wdtpci_notify_sys,
};


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

	dev_count++;
	if (dev_count > 1) {
		printk(KERN_ERR PFX "This driver only supports one device\n");
		return -ENODEV;
	}

	if (type != 500 && type != 501) {
		printk(KERN_ERR PFX "unknown card type '%d'.\n", type);
		return -ENODEV;
	}

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

	if (pci_resource_start(dev, 2) == 0x0000) {
		printk(KERN_ERR PFX "No I/O-Address for card detected\n");
		ret = -ENODEV;
		goto out_pci;
	}

	irq = dev->irq;
	io = pci_resource_start(dev, 2);

	if (request_region(io, 16, "wdt_pci") == NULL) {
		printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", io);
		goto out_pci;
	}

	if (request_irq(irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED,
			 "wdt_pci", &wdtpci_miscdev)) {
		printk(KERN_ERR PFX "IRQ %d is not free\n", irq);
		goto out_reg;
	}

	printk(KERN_INFO
	 "PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n",
								io, irq);

	/* Check that the heartbeat value is within its range;
	   if not reset to the default */
	if (wdtpci_set_heartbeat(heartbeat)) {
		wdtpci_set_heartbeat(WD_TIMO);
		printk(KERN_INFO PFX
		  "heartbeat value must be 0 < heartbeat < 65536, using %d\n",
								WD_TIMO);
	}

	ret = register_reboot_notifier(&wdtpci_notifier);
	if (ret) {
		printk(KERN_ERR PFX
			"cannot register reboot notifier (err=%d)\n", ret);
		goto out_irq;
	}

	if (type == 501) {
		ret = misc_register(&temp_miscdev);
		if (ret) {
			printk(KERN_ERR PFX
			"cannot register miscdev on minor=%d (err=%d)\n",
							TEMP_MINOR, ret);
			goto out_rbt;
		}
	}

	ret = misc_register(&wdtpci_miscdev);
	if (ret) {
		printk(KERN_ERR PFX
			"cannot register miscdev on minor=%d (err=%d)\n",
						WATCHDOG_MINOR, ret);
		goto out_misc;
	}

	printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
		heartbeat, nowayout);
	if (type == 501)
		printk(KERN_INFO "wdt: Fan Tachometer is %s\n",
				(tachometer ? "Enabled" : "Disabled"));

	ret = 0;
out:
	return ret;

out_misc:
	if (type == 501)
		misc_deregister(&temp_miscdev);
out_rbt:
	unregister_reboot_notifier(&wdtpci_notifier);
out_irq:
	free_irq(irq, &wdtpci_miscdev);
out_reg:
	release_region(io, 16);
out_pci:
	pci_disable_device(dev);
	goto out;
}


static void __devexit wdtpci_remove_one(struct pci_dev *pdev)
{
	/* here we assume only one device will ever have
	 * been picked up and registered by probe function */
	misc_deregister(&wdtpci_miscdev);
	if (type == 501)
		misc_deregister(&temp_miscdev);
	unregister_reboot_notifier(&wdtpci_notifier);
	free_irq(irq, &wdtpci_miscdev);
	release_region(io, 16);
	pci_disable_device(pdev);
	dev_count--;
}


static struct pci_device_id wdtpci_pci_tbl[] = {
	{
		.vendor	   = PCI_VENDOR_ID_ACCESSIO,
		.device	   = PCI_DEVICE_ID_WDG_CSM,
		.subvendor = PCI_ANY_ID,
		.subdevice = PCI_ANY_ID,
	},
	{ 0, }, /* terminate list */
};
MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);


static struct pci_driver wdtpci_driver = {
	.name		= "wdt_pci",
	.id_table	= wdtpci_pci_tbl,
	.probe		= wdtpci_init_one,
	.remove		= __devexit_p(wdtpci_remove_one),
};


/**
 *	wdtpci_cleanup:
 *
 *	Unload the watchdog. You cannot do this with any file handles open.
 *	If your watchdog is set to continue ticking on close and you unload
 *	it, well it keeps ticking. We won't get the interrupt but the board
 *	will not touch PC memory so all is fine. You just have to load a new
 *	module in xx seconds or reboot.
 */

static void __exit wdtpci_cleanup(void)
{
	pci_unregister_driver(&wdtpci_driver);
}


/**
 * 	wdtpci_init:
 *
 *	Set up the WDT watchdog board. All we have to do is grab the
 *	resources we require and bitch if anyone beat us to them.
 *	The open() function will actually kick the board off.
 */

static int __init wdtpci_init(void)
{
	return pci_register_driver(&wdtpci_driver);
}


module_init(wdtpci_init);
module_exit(wdtpci_cleanup);

MODULE_AUTHOR("JP Nollmann, Alan Cox");
MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
MODULE_ALIAS_MISCDEV(TEMP_MINOR);