xref: /openbmc/linux/drivers/watchdog/wdt_pci.c (revision 9ac8d3fb)
1 /*
2  *	Industrial Computer Source PCI-WDT500/501 driver
3  *
4  *	(c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>,
5  *						 All Rights Reserved.
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
33  *					failures
34  *		Joel Becker 	:	Added WDIOC_GET/SETTIMEOUT
35  *		Zwane Mwaikambo	:	Magic char closing, locking changes,
36  *					cleanups
37  *		Matt Domsch	:	nowayout module option
38  */
39 
40 #include <linux/interrupt.h>
41 #include <linux/module.h>
42 #include <linux/moduleparam.h>
43 #include <linux/types.h>
44 #include <linux/miscdevice.h>
45 #include <linux/watchdog.h>
46 #include <linux/ioport.h>
47 #include <linux/delay.h>
48 #include <linux/notifier.h>
49 #include <linux/reboot.h>
50 #include <linux/init.h>
51 #include <linux/fs.h>
52 #include <linux/pci.h>
53 #include <linux/io.h>
54 #include <linux/uaccess.h>
55 
56 #include <asm/system.h>
57 
58 #define WDT_IS_PCI
59 #include "wd501p.h"
60 
61 #define PFX "wdt_pci: "
62 
63 /*
64  * Until Access I/O gets their application for a PCI vendor ID approved,
65  * I don't think that it's appropriate to move these constants into the
66  * regular pci_ids.h file. -- JPN 2000/01/18
67  */
68 
69 #ifndef PCI_VENDOR_ID_ACCESSIO
70 #define PCI_VENDOR_ID_ACCESSIO 0x494f
71 #endif
72 #ifndef PCI_DEVICE_ID_WDG_CSM
73 #define PCI_DEVICE_ID_WDG_CSM 0x22c0
74 #endif
75 
76 /* We can only use 1 card due to the /dev/watchdog restriction */
77 static int dev_count;
78 
79 static unsigned long open_lock;
80 static DEFINE_SPINLOCK(wdtpci_lock);
81 static char expect_close;
82 
83 static int io;
84 static int irq;
85 
86 /* Default timeout */
87 #define WD_TIMO 60			/* Default heartbeat = 60 seconds */
88 
89 static int heartbeat = WD_TIMO;
90 static int wd_heartbeat;
91 module_param(heartbeat, int, 0);
92 MODULE_PARM_DESC(heartbeat,
93 		"Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
94 				__MODULE_STRING(WD_TIMO) ")");
95 
96 static int nowayout = WATCHDOG_NOWAYOUT;
97 module_param(nowayout, int, 0);
98 MODULE_PARM_DESC(nowayout,
99 		"Watchdog cannot be stopped once started (default="
100 				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
101 
102 #ifdef CONFIG_WDT_501_PCI
103 /* Support for the Fan Tachometer on the PCI-WDT501 */
104 static int tachometer;
105 
106 module_param(tachometer, int, 0);
107 MODULE_PARM_DESC(tachometer,
108 	"PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
109 #endif /* CONFIG_WDT_501_PCI */
110 
111 /*
112  *	Programming support
113  */
114 
115 static void wdtpci_ctr_mode(int ctr, int mode)
116 {
117 	ctr <<= 6;
118 	ctr |= 0x30;
119 	ctr |= (mode << 1);
120 	outb(ctr, WDT_CR);
121 	udelay(8);
122 }
123 
124 static void wdtpci_ctr_load(int ctr, int val)
125 {
126 	outb(val & 0xFF, WDT_COUNT0 + ctr);
127 	udelay(8);
128 	outb(val >> 8, WDT_COUNT0 + ctr);
129 	udelay(8);
130 }
131 
132 /**
133  *	wdtpci_start:
134  *
135  *	Start the watchdog driver.
136  */
137 
138 static int wdtpci_start(void)
139 {
140 	unsigned long flags;
141 
142 	spin_lock_irqsave(&wdtpci_lock, flags);
143 
144 	/*
145 	 * "pet" the watchdog, as Access says.
146 	 * This resets the clock outputs.
147 	 */
148 	inb(WDT_DC);			/* Disable watchdog */
149 	udelay(8);
150 	wdtpci_ctr_mode(2, 0);		/* Program CTR2 for Mode 0:
151 						Pulse on Terminal Count */
152 	outb(0, WDT_DC);		/* Enable watchdog */
153 	udelay(8);
154 	inb(WDT_DC);			/* Disable watchdog */
155 	udelay(8);
156 	outb(0, WDT_CLOCK);		/* 2.0833MHz clock */
157 	udelay(8);
158 	inb(WDT_BUZZER);		/* disable */
159 	udelay(8);
160 	inb(WDT_OPTONOTRST);		/* disable */
161 	udelay(8);
162 	inb(WDT_OPTORST);		/* disable */
163 	udelay(8);
164 	inb(WDT_PROGOUT);		/* disable */
165 	udelay(8);
166 	wdtpci_ctr_mode(0, 3);		/* Program CTR0 for Mode 3:
167 						Square Wave Generator */
168 	wdtpci_ctr_mode(1, 2);		/* Program CTR1 for Mode 2:
169 						Rate Generator */
170 	wdtpci_ctr_mode(2, 1);		/* Program CTR2 for Mode 1:
171 						Retriggerable One-Shot */
172 	wdtpci_ctr_load(0, 20833);	/* count at 100Hz */
173 	wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
174 	/* DO NOT LOAD CTR2 on PCI card! -- JPN */
175 	outb(0, WDT_DC);		/* Enable watchdog */
176 	udelay(8);
177 
178 	spin_unlock_irqrestore(&wdtpci_lock, flags);
179 	return 0;
180 }
181 
182 /**
183  *	wdtpci_stop:
184  *
185  *	Stop the watchdog driver.
186  */
187 
188 static int wdtpci_stop(void)
189 {
190 	unsigned long flags;
191 
192 	/* Turn the card off */
193 	spin_lock_irqsave(&wdtpci_lock, flags);
194 	inb(WDT_DC);			/* Disable watchdog */
195 	udelay(8);
196 	wdtpci_ctr_load(2, 0);		/* 0 length reset pulses now */
197 	spin_unlock_irqrestore(&wdtpci_lock, flags);
198 	return 0;
199 }
200 
201 /**
202  *	wdtpci_ping:
203  *
204  *	Reload counter one with the watchdog heartbeat. We don't bother
205  *	reloading the cascade counter.
206  */
207 
208 static int wdtpci_ping(void)
209 {
210 	unsigned long flags;
211 
212 	spin_lock_irqsave(&wdtpci_lock, flags);
213 	/* Write a watchdog value */
214 	inb(WDT_DC);			/* Disable watchdog */
215 	udelay(8);
216 	wdtpci_ctr_mode(1, 2);		/* Re-Program CTR1 for Mode 2:
217 							Rate Generator */
218 	wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
219 	outb(0, WDT_DC);		/* Enable watchdog */
220 	udelay(8);
221 	spin_unlock_irqrestore(&wdtpci_lock, flags);
222 	return 0;
223 }
224 
225 /**
226  *	wdtpci_set_heartbeat:
227  *	@t:		the new heartbeat value that needs to be set.
228  *
229  *	Set a new heartbeat value for the watchdog device. If the heartbeat
230  *	value is incorrect we keep the old value and return -EINVAL.
231  *	If successful we return 0.
232  */
233 static int wdtpci_set_heartbeat(int t)
234 {
235 	/* Arbitrary, can't find the card's limits */
236 	if (t < 1 || t > 65535)
237 		return -EINVAL;
238 
239 	heartbeat = t;
240 	wd_heartbeat = t * 100;
241 	return 0;
242 }
243 
244 /**
245  *	wdtpci_get_status:
246  *	@status:		the new status.
247  *
248  *	Extract the status information from a WDT watchdog device. There are
249  *	several board variants so we have to know which bits are valid. Some
250  *	bits default to one and some to zero in order to be maximally painful.
251  *
252  *	we then map the bits onto the status ioctl flags.
253  */
254 
255 static int wdtpci_get_status(int *status)
256 {
257 	unsigned char new_status;
258 	unsigned long flags;
259 
260 	spin_lock_irqsave(&wdtpci_lock, flags);
261 	new_status = inb(WDT_SR);
262 	spin_unlock_irqrestore(&wdtpci_lock, flags);
263 
264 	*status = 0;
265 	if (new_status & WDC_SR_ISOI0)
266 		*status |= WDIOF_EXTERN1;
267 	if (new_status & WDC_SR_ISII1)
268 		*status |= WDIOF_EXTERN2;
269 #ifdef CONFIG_WDT_501_PCI
270 	if (!(new_status & WDC_SR_TGOOD))
271 		*status |= WDIOF_OVERHEAT;
272 	if (!(new_status & WDC_SR_PSUOVER))
273 		*status |= WDIOF_POWEROVER;
274 	if (!(new_status & WDC_SR_PSUUNDR))
275 		*status |= WDIOF_POWERUNDER;
276 	if (tachometer) {
277 		if (!(new_status & WDC_SR_FANGOOD))
278 			*status |= WDIOF_FANFAULT;
279 	}
280 #endif /* CONFIG_WDT_501_PCI */
281 	return 0;
282 }
283 
284 #ifdef CONFIG_WDT_501_PCI
285 /**
286  *	wdtpci_get_temperature:
287  *
288  *	Reports the temperature in degrees Fahrenheit. The API is in
289  *	farenheit. It was designed by an imperial measurement luddite.
290  */
291 
292 static int wdtpci_get_temperature(int *temperature)
293 {
294 	unsigned short c;
295 	unsigned long flags;
296 	spin_lock_irqsave(&wdtpci_lock, flags);
297 	c = inb(WDT_RT);
298 	udelay(8);
299 	spin_unlock_irqrestore(&wdtpci_lock, flags);
300 	*temperature = (c * 11 / 15) + 7;
301 	return 0;
302 }
303 #endif /* CONFIG_WDT_501_PCI */
304 
305 /**
306  *	wdtpci_interrupt:
307  *	@irq:		Interrupt number
308  *	@dev_id:	Unused as we don't allow multiple devices.
309  *
310  *	Handle an interrupt from the board. These are raised when the status
311  *	map changes in what the board considers an interesting way. That means
312  *	a failure condition occurring.
313  */
314 
315 static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
316 {
317 	/*
318 	 *	Read the status register see what is up and
319 	 *	then printk it.
320 	 */
321 	unsigned char status;
322 
323 	spin_lock(&wdtpci_lock);
324 
325 	status = inb(WDT_SR);
326 	udelay(8);
327 
328 	printk(KERN_CRIT PFX "status %d\n", status);
329 
330 #ifdef CONFIG_WDT_501_PCI
331 	if (!(status & WDC_SR_TGOOD)) {
332 		u8 alarm = inb(WDT_RT);
333 		printk(KERN_CRIT PFX "Overheat alarm.(%d)\n", alarm);
334 		udelay(8);
335 	}
336 	if (!(status & WDC_SR_PSUOVER))
337 		printk(KERN_CRIT PFX "PSU over voltage.\n");
338 	if (!(status & WDC_SR_PSUUNDR))
339 		printk(KERN_CRIT PFX "PSU under voltage.\n");
340 	if (tachometer) {
341 		if (!(status & WDC_SR_FANGOOD))
342 			printk(KERN_CRIT PFX "Possible fan fault.\n");
343 	}
344 #endif /* CONFIG_WDT_501_PCI */
345 	if (!(status&WDC_SR_WCCR)) {
346 #ifdef SOFTWARE_REBOOT
347 #ifdef ONLY_TESTING
348 		printk(KERN_CRIT PFX "Would Reboot.\n");
349 #else
350 		printk(KERN_CRIT PFX "Initiating system reboot.\n");
351 		emergency_restart(NULL);
352 #endif
353 #else
354 		printk(KERN_CRIT PFX "Reset in 5ms.\n");
355 #endif
356 	}
357 	spin_unlock(&wdtpci_lock);
358 	return IRQ_HANDLED;
359 }
360 
361 
362 /**
363  *	wdtpci_write:
364  *	@file: file handle to the watchdog
365  *	@buf: buffer to write (unused as data does not matter here
366  *	@count: count of bytes
367  *	@ppos: pointer to the position to write. No seeks allowed
368  *
369  *	A write to a watchdog device is defined as a keepalive signal. Any
370  *	write of data will do, as we we don't define content meaning.
371  */
372 
373 static ssize_t wdtpci_write(struct file *file, const char __user *buf,
374 					size_t count, loff_t *ppos)
375 {
376 	if (count) {
377 		if (!nowayout) {
378 			size_t i;
379 
380 			expect_close = 0;
381 
382 			for (i = 0; i != count; i++) {
383 				char c;
384 				if (get_user(c, buf + i))
385 					return -EFAULT;
386 				if (c == 'V')
387 					expect_close = 42;
388 			}
389 		}
390 		wdtpci_ping();
391 	}
392 	return count;
393 }
394 
395 /**
396  *	wdtpci_ioctl:
397  *	@file: file handle to the device
398  *	@cmd: watchdog command
399  *	@arg: argument pointer
400  *
401  *	The watchdog API defines a common set of functions for all watchdogs
402  *	according to their available features. We only actually usefully support
403  *	querying capabilities and current status.
404  */
405 
406 static long wdtpci_ioctl(struct file *file, unsigned int cmd,
407 							unsigned long arg)
408 {
409 	int new_heartbeat;
410 	int status;
411 	void __user *argp = (void __user *)arg;
412 	int __user *p = argp;
413 
414 	static struct watchdog_info ident = {
415 		.options =		WDIOF_SETTIMEOUT|
416 					WDIOF_MAGICCLOSE|
417 					WDIOF_KEEPALIVEPING,
418 		.firmware_version =	1,
419 		.identity =		"PCI-WDT500/501",
420 	};
421 
422 	/* Add options according to the card we have */
423 	ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
424 #ifdef CONFIG_WDT_501_PCI
425 	ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER);
426 	if (tachometer)
427 		ident.options |= WDIOF_FANFAULT;
428 #endif /* CONFIG_WDT_501_PCI */
429 
430 	switch (cmd) {
431 	case WDIOC_GETSUPPORT:
432 		return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
433 	case WDIOC_GETSTATUS:
434 		wdtpci_get_status(&status);
435 		return put_user(status, p);
436 	case WDIOC_GETBOOTSTATUS:
437 		return put_user(0, p);
438 	case WDIOC_KEEPALIVE:
439 		wdtpci_ping();
440 		return 0;
441 	case WDIOC_SETTIMEOUT:
442 		if (get_user(new_heartbeat, p))
443 			return -EFAULT;
444 		if (wdtpci_set_heartbeat(new_heartbeat))
445 			return -EINVAL;
446 		wdtpci_ping();
447 		/* Fall */
448 	case WDIOC_GETTIMEOUT:
449 		return put_user(heartbeat, p);
450 	default:
451 		return -ENOTTY;
452 	}
453 }
454 
455 /**
456  *	wdtpci_open:
457  *	@inode: inode of device
458  *	@file: file handle to device
459  *
460  *	The watchdog device has been opened. The watchdog device is single
461  *	open and on opening we load the counters. Counter zero is a 100Hz
462  *	cascade, into counter 1 which downcounts to reboot. When the counter
463  *	triggers counter 2 downcounts the length of the reset pulse which
464  *	set set to be as long as possible.
465  */
466 
467 static int wdtpci_open(struct inode *inode, struct file *file)
468 {
469 	if (test_and_set_bit(0, &open_lock))
470 		return -EBUSY;
471 
472 	if (nowayout)
473 		__module_get(THIS_MODULE);
474 	/*
475 	 *	Activate
476 	 */
477 	wdtpci_start();
478 	return nonseekable_open(inode, file);
479 }
480 
481 /**
482  *	wdtpci_release:
483  *	@inode: inode to board
484  *	@file: file handle to board
485  *
486  *	The watchdog has a configurable API. There is a religious dispute
487  *	between people who want their watchdog to be able to shut down and
488  *	those who want to be sure if the watchdog manager dies the machine
489  *	reboots. In the former case we disable the counters, in the latter
490  *	case you have to open it again very soon.
491  */
492 
493 static int wdtpci_release(struct inode *inode, struct file *file)
494 {
495 	if (expect_close == 42) {
496 		wdtpci_stop();
497 	} else {
498 		printk(KERN_CRIT PFX "Unexpected close, not stopping timer!");
499 		wdtpci_ping();
500 	}
501 	expect_close = 0;
502 	clear_bit(0, &open_lock);
503 	return 0;
504 }
505 
506 #ifdef CONFIG_WDT_501_PCI
507 /**
508  *	wdtpci_temp_read:
509  *	@file: file handle to the watchdog board
510  *	@buf: buffer to write 1 byte into
511  *	@count: length of buffer
512  *	@ptr: offset (no seek allowed)
513  *
514  *	Read reports the temperature in degrees Fahrenheit. The API is in
515  *	fahrenheit. It was designed by an imperial measurement luddite.
516  */
517 
518 static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
519 						size_t count, loff_t *ptr)
520 {
521 	int temperature;
522 
523 	if (wdtpci_get_temperature(&temperature))
524 		return -EFAULT;
525 
526 	if (copy_to_user(buf, &temperature, 1))
527 		return -EFAULT;
528 
529 	return 1;
530 }
531 
532 /**
533  *	wdtpci_temp_open:
534  *	@inode: inode of device
535  *	@file: file handle to device
536  *
537  *	The temperature device has been opened.
538  */
539 
540 static int wdtpci_temp_open(struct inode *inode, struct file *file)
541 {
542 	return nonseekable_open(inode, file);
543 }
544 
545 /**
546  *	wdtpci_temp_release:
547  *	@inode: inode to board
548  *	@file: file handle to board
549  *
550  *	The temperature device has been closed.
551  */
552 
553 static int wdtpci_temp_release(struct inode *inode, struct file *file)
554 {
555 	return 0;
556 }
557 #endif /* CONFIG_WDT_501_PCI */
558 
559 /**
560  *	notify_sys:
561  *	@this: our notifier block
562  *	@code: the event being reported
563  *	@unused: unused
564  *
565  *	Our notifier is called on system shutdowns. We want to turn the card
566  *	off at reboot otherwise the machine will reboot again during memory
567  *	test or worse yet during the following fsck. This would suck, in fact
568  *	trust me - if it happens it does suck.
569  */
570 
571 static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
572 							void *unused)
573 {
574 	if (code == SYS_DOWN || code == SYS_HALT)
575 		wdtpci_stop();
576 	return NOTIFY_DONE;
577 }
578 
579 /*
580  *	Kernel Interfaces
581  */
582 
583 
584 static const struct file_operations wdtpci_fops = {
585 	.owner		= THIS_MODULE,
586 	.llseek		= no_llseek,
587 	.write		= wdtpci_write,
588 	.unlocked_ioctl	= wdtpci_ioctl,
589 	.open		= wdtpci_open,
590 	.release	= wdtpci_release,
591 };
592 
593 static struct miscdevice wdtpci_miscdev = {
594 	.minor	= WATCHDOG_MINOR,
595 	.name	= "watchdog",
596 	.fops	= &wdtpci_fops,
597 };
598 
599 #ifdef CONFIG_WDT_501_PCI
600 static const struct file_operations wdtpci_temp_fops = {
601 	.owner		= THIS_MODULE,
602 	.llseek		= no_llseek,
603 	.read		= wdtpci_temp_read,
604 	.open		= wdtpci_temp_open,
605 	.release	= wdtpci_temp_release,
606 };
607 
608 static struct miscdevice temp_miscdev = {
609 	.minor	= TEMP_MINOR,
610 	.name	= "temperature",
611 	.fops	= &wdtpci_temp_fops,
612 };
613 #endif /* CONFIG_WDT_501_PCI */
614 
615 /*
616  *	The WDT card needs to learn about soft shutdowns in order to
617  *	turn the timebomb registers off.
618  */
619 
620 static struct notifier_block wdtpci_notifier = {
621 	.notifier_call = wdtpci_notify_sys,
622 };
623 
624 
625 static int __devinit wdtpci_init_one(struct pci_dev *dev,
626 					const struct pci_device_id *ent)
627 {
628 	int ret = -EIO;
629 
630 	dev_count++;
631 	if (dev_count > 1) {
632 		printk(KERN_ERR PFX "This driver only supports one device\n");
633 		return -ENODEV;
634 	}
635 
636 	if (pci_enable_device(dev)) {
637 		printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
638 		return -ENODEV;
639 	}
640 
641 	if (pci_resource_start(dev, 2) == 0x0000) {
642 		printk(KERN_ERR PFX "No I/O-Address for card detected\n");
643 		ret = -ENODEV;
644 		goto out_pci;
645 	}
646 
647 	irq = dev->irq;
648 	io = pci_resource_start(dev, 2);
649 
650 	if (request_region(io, 16, "wdt_pci") == NULL) {
651 		printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", io);
652 		goto out_pci;
653 	}
654 
655 	if (request_irq(irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED,
656 			 "wdt_pci", &wdtpci_miscdev)) {
657 		printk(KERN_ERR PFX "IRQ %d is not free\n", irq);
658 		goto out_reg;
659 	}
660 
661 	printk(KERN_INFO
662 	 "PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n",
663 								io, irq);
664 
665 	/* Check that the heartbeat value is within its range;
666 	   if not reset to the default */
667 	if (wdtpci_set_heartbeat(heartbeat)) {
668 		wdtpci_set_heartbeat(WD_TIMO);
669 		printk(KERN_INFO PFX
670 		  "heartbeat value must be 0 < heartbeat < 65536, using %d\n",
671 								WD_TIMO);
672 	}
673 
674 	ret = register_reboot_notifier(&wdtpci_notifier);
675 	if (ret) {
676 		printk(KERN_ERR PFX
677 			"cannot register reboot notifier (err=%d)\n", ret);
678 		goto out_irq;
679 	}
680 
681 #ifdef CONFIG_WDT_501_PCI
682 	ret = misc_register(&temp_miscdev);
683 	if (ret) {
684 		printk(KERN_ERR PFX
685 			"cannot register miscdev on minor=%d (err=%d)\n",
686 					TEMP_MINOR, ret);
687 		goto out_rbt;
688 	}
689 #endif /* CONFIG_WDT_501_PCI */
690 
691 	ret = misc_register(&wdtpci_miscdev);
692 	if (ret) {
693 		printk(KERN_ERR PFX
694 			"cannot register miscdev on minor=%d (err=%d)\n",
695 						WATCHDOG_MINOR, ret);
696 		goto out_misc;
697 	}
698 
699 	printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
700 		heartbeat, nowayout);
701 #ifdef CONFIG_WDT_501_PCI
702 	printk(KERN_INFO "wdt: Fan Tachometer is %s\n",
703 				(tachometer ? "Enabled" : "Disabled"));
704 #endif /* CONFIG_WDT_501_PCI */
705 
706 	ret = 0;
707 out:
708 	return ret;
709 
710 out_misc:
711 #ifdef CONFIG_WDT_501_PCI
712 	misc_deregister(&temp_miscdev);
713 out_rbt:
714 #endif /* CONFIG_WDT_501_PCI */
715 	unregister_reboot_notifier(&wdtpci_notifier);
716 out_irq:
717 	free_irq(irq, &wdtpci_miscdev);
718 out_reg:
719 	release_region(io, 16);
720 out_pci:
721 	pci_disable_device(dev);
722 	goto out;
723 }
724 
725 
726 static void __devexit wdtpci_remove_one(struct pci_dev *pdev)
727 {
728 	/* here we assume only one device will ever have
729 	 * been picked up and registered by probe function */
730 	misc_deregister(&wdtpci_miscdev);
731 #ifdef CONFIG_WDT_501_PCI
732 	misc_deregister(&temp_miscdev);
733 #endif /* CONFIG_WDT_501_PCI */
734 	unregister_reboot_notifier(&wdtpci_notifier);
735 	free_irq(irq, &wdtpci_miscdev);
736 	release_region(io, 16);
737 	pci_disable_device(pdev);
738 	dev_count--;
739 }
740 
741 
742 static struct pci_device_id wdtpci_pci_tbl[] = {
743 	{
744 		.vendor	   = PCI_VENDOR_ID_ACCESSIO,
745 		.device	   = PCI_DEVICE_ID_WDG_CSM,
746 		.subvendor = PCI_ANY_ID,
747 		.subdevice = PCI_ANY_ID,
748 	},
749 	{ 0, }, /* terminate list */
750 };
751 MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
752 
753 
754 static struct pci_driver wdtpci_driver = {
755 	.name		= "wdt_pci",
756 	.id_table	= wdtpci_pci_tbl,
757 	.probe		= wdtpci_init_one,
758 	.remove		= __devexit_p(wdtpci_remove_one),
759 };
760 
761 
762 /**
763  *	wdtpci_cleanup:
764  *
765  *	Unload the watchdog. You cannot do this with any file handles open.
766  *	If your watchdog is set to continue ticking on close and you unload
767  *	it, well it keeps ticking. We won't get the interrupt but the board
768  *	will not touch PC memory so all is fine. You just have to load a new
769  *	module in xx seconds or reboot.
770  */
771 
772 static void __exit wdtpci_cleanup(void)
773 {
774 	pci_unregister_driver(&wdtpci_driver);
775 }
776 
777 
778 /**
779  * 	wdtpci_init:
780  *
781  *	Set up the WDT watchdog board. All we have to do is grab the
782  *	resources we require and bitch if anyone beat us to them.
783  *	The open() function will actually kick the board off.
784  */
785 
786 static int __init wdtpci_init(void)
787 {
788 	return pci_register_driver(&wdtpci_driver);
789 }
790 
791 
792 module_init(wdtpci_init);
793 module_exit(wdtpci_cleanup);
794 
795 MODULE_AUTHOR("JP Nollmann, Alan Cox");
796 MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
797 MODULE_LICENSE("GPL");
798 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
799 MODULE_ALIAS_MISCDEV(TEMP_MINOR);
800