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CommitLineData
1da177e4
LT
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
9f2d1f0d
AC
32 * Tigran Aivazian : Restructured wdtpci_init_one() to handle
33 * failures
1da177e4 34 * Joel Becker : Added WDIOC_GET/SETTIMEOUT
9f2d1f0d
AC
35 * Zwane Mwaikambo : Magic char closing, locking changes,
36 * cleanups
1da177e4
LT
37 * Matt Domsch : nowayout module option
38 */
39
1da177e4
LT
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>
81830061 47#include <linux/delay.h>
1da177e4
LT
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>
9f2d1f0d
AC
53#include <linux/io.h>
54#include <linux/uaccess.h>
1da177e4 55
1da177e4
LT
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 */
77static int dev_count;
78
9f2d1f0d 79static unsigned long open_lock;
c7dfd0cc 80static DEFINE_SPINLOCK(wdtpci_lock);
1da177e4
LT
81static char expect_close;
82
83static int io;
84static int irq;
85
86/* Default timeout */
87#define WD_TIMO 60 /* Default heartbeat = 60 seconds */
88
89static int heartbeat = WD_TIMO;
90static int wd_heartbeat;
91module_param(heartbeat, int, 0);
9f2d1f0d
AC
92MODULE_PARM_DESC(heartbeat,
93 "Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
94 __MODULE_STRING(WD_TIMO) ")");
1da177e4 95
4bfdf378 96static int nowayout = WATCHDOG_NOWAYOUT;
1da177e4 97module_param(nowayout, int, 0);
9f2d1f0d
AC
98MODULE_PARM_DESC(nowayout,
99 "Watchdog cannot be stopped once started (default="
100 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
1da177e4
LT
101
102#ifdef CONFIG_WDT_501_PCI
103/* Support for the Fan Tachometer on the PCI-WDT501 */
104static int tachometer;
105
106module_param(tachometer, int, 0);
9f2d1f0d
AC
107MODULE_PARM_DESC(tachometer,
108 "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
1da177e4
LT
109#endif /* CONFIG_WDT_501_PCI */
110
111/*
112 * Programming support
113 */
114
115static void wdtpci_ctr_mode(int ctr, int mode)
116{
9f2d1f0d
AC
117 ctr <<= 6;
118 ctr |= 0x30;
119 ctr |= (mode << 1);
120 outb(ctr, WDT_CR);
121 udelay(8);
1da177e4
LT
122}
123
124static void wdtpci_ctr_load(int ctr, int val)
125{
9f2d1f0d
AC
126 outb(val & 0xFF, WDT_COUNT0 + ctr);
127 udelay(8);
128 outb(val >> 8, WDT_COUNT0 + ctr);
129 udelay(8);
1da177e4
LT
130}
131
132/**
133 * wdtpci_start:
134 *
135 * Start the watchdog driver.
136 */
137
138static 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 */
9f2d1f0d
AC
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 */
1da177e4 174 /* DO NOT LOAD CTR2 on PCI card! -- JPN */
9f2d1f0d
AC
175 outb(0, WDT_DC); /* Enable watchdog */
176 udelay(8);
1da177e4
LT
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
9f2d1f0d 188static int wdtpci_stop(void)
1da177e4
LT
189{
190 unsigned long flags;
191
192 /* Turn the card off */
193 spin_lock_irqsave(&wdtpci_lock, flags);
9f2d1f0d
AC
194 inb(WDT_DC); /* Disable watchdog */
195 udelay(8);
196 wdtpci_ctr_load(2, 0); /* 0 length reset pulses now */
1da177e4
LT
197 spin_unlock_irqrestore(&wdtpci_lock, flags);
198 return 0;
199}
200
201/**
202 * wdtpci_ping:
203 *
9f2d1f0d
AC
204 * Reload counter one with the watchdog heartbeat. We don't bother
205 * reloading the cascade counter.
1da177e4
LT
206 */
207
208static int wdtpci_ping(void)
209{
210 unsigned long flags;
211
1da177e4 212 spin_lock_irqsave(&wdtpci_lock, flags);
9f2d1f0d
AC
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);
1da177e4
LT
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 *
9f2d1f0d
AC
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.
1da177e4
LT
232 */
233static int wdtpci_set_heartbeat(int t)
234{
235 /* Arbitrary, can't find the card's limits */
9f2d1f0d 236 if (t < 1 || t > 65535)
1da177e4
LT
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
255static int wdtpci_get_status(int *status)
256{
9f2d1f0d
AC
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);
1da177e4 263
9f2d1f0d 264 *status = 0;
1da177e4
LT
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
292static int wdtpci_get_temperature(int *temperature)
293{
9f2d1f0d
AC
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);
1da177e4
LT
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.
1da177e4
LT
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
7d12e780 315static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
1da177e4
LT
316{
317 /*
318 * Read the status register see what is up and
319 * then printk it.
320 */
9f2d1f0d
AC
321 unsigned char status;
322
323 spin_lock(&wdtpci_lock);
324
325 status = inb(WDT_SR);
326 udelay(8);
1da177e4
LT
327
328 printk(KERN_CRIT PFX "status %d\n", status);
329
330#ifdef CONFIG_WDT_501_PCI
9f2d1f0d
AC
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 }
1da177e4 336 if (!(status & WDC_SR_PSUOVER))
9f2d1f0d 337 printk(KERN_CRIT PFX "PSU over voltage.\n");
1da177e4 338 if (!(status & WDC_SR_PSUUNDR))
9f2d1f0d 339 printk(KERN_CRIT PFX "PSU under voltage.\n");
1da177e4
LT
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 */
59338d4c 345 if (!(status&WDC_SR_WCCR)) {
1da177e4
LT
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");
f82567e5 351 emergency_restart(NULL);
1da177e4
LT
352#endif
353#else
354 printk(KERN_CRIT PFX "Reset in 5ms.\n");
355#endif
59338d4c 356 }
9f2d1f0d 357 spin_unlock(&wdtpci_lock);
1da177e4
LT
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
9f2d1f0d
AC
373static ssize_t wdtpci_write(struct file *file, const char __user *buf,
374 size_t count, loff_t *ppos)
1da177e4
LT
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;
9f2d1f0d 384 if (get_user(c, buf+i))
1da177e4
LT
385 return -EFAULT;
386 if (c == 'V')
387 expect_close = 42;
388 }
389 }
390 wdtpci_ping();
391 }
1da177e4
LT
392 return count;
393}
394
395/**
396 * wdtpci_ioctl:
1da177e4
LT
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
9f2d1f0d
AC
406static long wdtpci_ioctl(struct file *file, unsigned int cmd,
407 unsigned long arg)
1da177e4
LT
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
9f2d1f0d 430 switch (cmd) {
9f2d1f0d
AC
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);
0c06090c
WVS
450 default:
451 return -ENOTTY;
452 }
1da177e4
LT
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
467static int wdtpci_open(struct inode *inode, struct file *file)
468{
9f2d1f0d 469 if (test_and_set_bit(0, &open_lock))
1da177e4
LT
470 return -EBUSY;
471
9f2d1f0d 472 if (nowayout)
1da177e4 473 __module_get(THIS_MODULE);
1da177e4
LT
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
493static 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;
9f2d1f0d 502 clear_bit(0, &open_lock);
1da177e4
LT
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
9f2d1f0d
AC
518static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
519 size_t count, loff_t *ptr)
1da177e4
LT
520{
521 int temperature;
522
523 if (wdtpci_get_temperature(&temperature))
524 return -EFAULT;
525
9f2d1f0d 526 if (copy_to_user(buf, &temperature, 1))
1da177e4
LT
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
540static 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
553static 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
571static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
9f2d1f0d 572 void *unused)
1da177e4 573{
9f2d1f0d 574 if (code == SYS_DOWN || code == SYS_HALT)
1da177e4 575 wdtpci_stop();
1da177e4
LT
576 return NOTIFY_DONE;
577}
578
579/*
580 * Kernel Interfaces
581 */
582
583
62322d25 584static const struct file_operations wdtpci_fops = {
1da177e4
LT
585 .owner = THIS_MODULE,
586 .llseek = no_llseek,
587 .write = wdtpci_write,
9f2d1f0d 588 .unlocked_ioctl = wdtpci_ioctl,
1da177e4
LT
589 .open = wdtpci_open,
590 .release = wdtpci_release,
591};
592
593static struct miscdevice wdtpci_miscdev = {
594 .minor = WATCHDOG_MINOR,
595 .name = "watchdog",
596 .fops = &wdtpci_fops,
597};
598
599#ifdef CONFIG_WDT_501_PCI
62322d25 600static const struct file_operations wdtpci_temp_fops = {
1da177e4
LT
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
608static 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
620static struct notifier_block wdtpci_notifier = {
621 .notifier_call = wdtpci_notify_sys,
622};
623
624
9f2d1f0d
AC
625static int __devinit wdtpci_init_one(struct pci_dev *dev,
626 const struct pci_device_id *ent)
1da177e4
LT
627{
628 int ret = -EIO;
629
630 dev_count++;
631 if (dev_count > 1) {
9f2d1f0d 632 printk(KERN_ERR PFX "This driver only supports one device\n");
1da177e4
LT
633 return -ENODEV;
634 }
635
9f2d1f0d
AC
636 if (pci_enable_device(dev)) {
637 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
1da177e4
LT
638 return -ENODEV;
639 }
640
9f2d1f0d
AC
641 if (pci_resource_start(dev, 2) == 0x0000) {
642 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
1da177e4
LT
643 ret = -ENODEV;
644 goto out_pci;
645 }
646
1da177e4 647 irq = dev->irq;
9f2d1f0d 648 io = pci_resource_start(dev, 2);
1da177e4 649
9f2d1f0d
AC
650 if (request_region(io, 16, "wdt_pci") == NULL) {
651 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", io);
1da177e4
LT
652 goto out_pci;
653 }
654
9f2d1f0d 655 if (request_irq(irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED,
1da177e4 656 "wdt_pci", &wdtpci_miscdev)) {
9f2d1f0d 657 printk(KERN_ERR PFX "IRQ %d is not free\n", irq);
1da177e4
LT
658 goto out_reg;
659 }
660
9f2d1f0d
AC
661 printk(KERN_INFO
662 "PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n",
663 io, irq);
1da177e4 664
9f2d1f0d
AC
665 /* Check that the heartbeat value is within its range;
666 if not reset to the default */
1da177e4
LT
667 if (wdtpci_set_heartbeat(heartbeat)) {
668 wdtpci_set_heartbeat(WD_TIMO);
9f2d1f0d
AC
669 printk(KERN_INFO PFX
670 "heartbeat value must be 0 < heartbeat < 65536, using %d\n",
671 WD_TIMO);
1da177e4
LT
672 }
673
9f2d1f0d 674 ret = register_reboot_notifier(&wdtpci_notifier);
1da177e4 675 if (ret) {
9f2d1f0d
AC
676 printk(KERN_ERR PFX
677 "cannot register reboot notifier (err=%d)\n", ret);
1da177e4
LT
678 goto out_irq;
679 }
680
681#ifdef CONFIG_WDT_501_PCI
9f2d1f0d 682 ret = misc_register(&temp_miscdev);
1da177e4 683 if (ret) {
9f2d1f0d
AC
684 printk(KERN_ERR PFX
685 "cannot register miscdev on minor=%d (err=%d)\n",
686 TEMP_MINOR, ret);
1da177e4
LT
687 goto out_rbt;
688 }
689#endif /* CONFIG_WDT_501_PCI */
690
9f2d1f0d 691 ret = misc_register(&wdtpci_miscdev);
1da177e4 692 if (ret) {
9f2d1f0d
AC
693 printk(KERN_ERR PFX
694 "cannot register miscdev on minor=%d (err=%d)\n",
695 WATCHDOG_MINOR, ret);
1da177e4
LT
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
9f2d1f0d
AC
702 printk(KERN_INFO "wdt: Fan Tachometer is %s\n",
703 (tachometer ? "Enabled" : "Disabled"));
1da177e4
LT
704#endif /* CONFIG_WDT_501_PCI */
705
706 ret = 0;
707out:
708 return ret;
709
710out_misc:
711#ifdef CONFIG_WDT_501_PCI
712 misc_deregister(&temp_miscdev);
713out_rbt:
714#endif /* CONFIG_WDT_501_PCI */
715 unregister_reboot_notifier(&wdtpci_notifier);
716out_irq:
717 free_irq(irq, &wdtpci_miscdev);
718out_reg:
9f2d1f0d 719 release_region(io, 16);
1da177e4
LT
720out_pci:
721 pci_disable_device(dev);
722 goto out;
723}
724
725
9f2d1f0d 726static void __devexit wdtpci_remove_one(struct pci_dev *pdev)
1da177e4
LT
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
742static 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};
751MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
752
753
754static 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
772static void __exit wdtpci_cleanup(void)
773{
9f2d1f0d 774 pci_unregister_driver(&wdtpci_driver);
1da177e4
LT
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
786static int __init wdtpci_init(void)
787{
9f2d1f0d 788 return pci_register_driver(&wdtpci_driver);
1da177e4
LT
789}
790
791
792module_init(wdtpci_init);
793module_exit(wdtpci_cleanup);
794
795MODULE_AUTHOR("JP Nollmann, Alan Cox");
796MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
797MODULE_LICENSE("GPL");
798MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
799MODULE_ALIAS_MISCDEV(TEMP_MINOR);