aboutsummaryrefslogtreecommitdiff
path: root/drivers/watchdog/pcwd_pci.c
blob: c0d07eef2640b9cb0f2469acda6a579e57a16d94 (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
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
/*
 *	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, ...
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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 struct miscdevice */
#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 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 bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 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)
		pr_debug("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n",
			 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) {
			pr_debug("time to process command was: %d ms\n",
				 count);
		} else {
			pr_debug("card did not respond on command!\n");
		}
	}

	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)
			pr_debug("received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
				 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();

	pr_info("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"));

	pr_info("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)
		pr_info("Previous reset was caused by the Watchdog card\n");

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

	if (pcipcwd_private.boot_status == 0)
		pr_info("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) {
		pr_err("Card timer not enabled\n");
		return -1;
	}

	if (debug >= VERBOSE)
		pr_debug("Watchdog started\n");

	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)) {
		pr_err("Card did not acknowledge disable attempt\n");
		return -1;
	}

	if (debug >= VERBOSE)
		pr_debug("Watchdog stopped\n");

	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)
		pr_debug("Watchdog keepalive signal send\n");

	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)
		pr_debug("New heartbeat: %d\n", 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(KBUILD_MODNAME ": Temperature overheat trip!\n");
	}

	if (debug >= DEBUG)
		pr_debug("Control Status #1: 0x%02x\n", control_status);

	return 0;
}

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

	if (debug >= VERBOSE)
		pr_info("clearing watchdog trip status & LED\n");

	control_status = inb_p(pcipcwd_private.io_addr + 1);

	if (debug >= DEBUG) {
		pr_debug("status was: 0x%02x\n", control_status);
		pr_debug("sending: 0x%02x\n",
			 (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) {
		pr_debug("reset count was: 0x%02x\n", 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) {
		pr_debug("temperature is: %d F\n", *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)
		pr_debug("Time left before next reboot: %d\n", *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)
			pr_err("Attempt to open already opened device\n");
		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 {
		pr_crit("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)
		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 pcipcwd_card_init(struct pci_dev *pdev,
		const struct pci_device_id *ent)
{
	int ret = -EIO;

	cards_found++;
	if (cards_found == 1)
		pr_info("%s\n", DRIVER_VERSION);

	if (cards_found > 1) {
		pr_err("This driver only supports 1 device\n");
		return -ENODEV;
	}

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

	if (pci_resource_start(pdev, 0) == 0x0000) {
		pr_err("No I/O-Address for card detected\n");
		ret = -ENODEV;
		goto err_out_disable_device;
	}

	spin_lock_init(&pcipcwd_private.io_lock);
	pcipcwd_private.pdev = pdev;
	pcipcwd_private.io_addr = pci_resource_start(pdev, 0);

	if (pci_request_regions(pdev, WATCHDOG_NAME)) {
		pr_err("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();

	/* 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);
		pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n",
			WATCHDOG_HEARTBEAT);
	}

	ret = register_reboot_notifier(&pcipcwd_notifier);
	if (ret != 0) {
		pr_err("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) {
			pr_err("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) {
		pr_err("cannot register miscdev on minor=%d (err=%d)\n",
		       WATCHDOG_MINOR, ret);
		goto err_out_misc_deregister;
	}

	pr_info("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 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 const 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		= pcipcwd_card_exit,
};

module_pci_driver(pcipcwd_driver);

MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
MODULE_LICENSE("GPL");