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1da177e4 LT |
1 | /* |
2 | * Industrial Computer Source 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 | * Tigran Aivazian : Restructured wdt_init() to handle failures | |
30 | * Joel Becker : Added WDIOC_GET/SETTIMEOUT | |
31 | * Matt Domsch : Added nowayout module option | |
32 | */ | |
33 | ||
34 | #include <linux/config.h> | |
35 | #include <linux/interrupt.h> | |
36 | #include <linux/module.h> | |
37 | #include <linux/moduleparam.h> | |
38 | #include <linux/types.h> | |
39 | #include <linux/miscdevice.h> | |
40 | #include <linux/watchdog.h> | |
41 | #include <linux/fs.h> | |
42 | #include <linux/ioport.h> | |
43 | #include <linux/notifier.h> | |
44 | #include <linux/reboot.h> | |
45 | #include <linux/init.h> | |
46 | ||
47 | #include <asm/io.h> | |
48 | #include <asm/uaccess.h> | |
49 | #include <asm/system.h> | |
50 | #include "wd501p.h" | |
51 | ||
52 | static unsigned long wdt_is_open; | |
53 | static char expect_close; | |
54 | ||
55 | /* | |
56 | * Module parameters | |
57 | */ | |
58 | ||
59 | #define WD_TIMO 60 /* Default heartbeat = 60 seconds */ | |
60 | ||
61 | static int heartbeat = WD_TIMO; | |
62 | static int wd_heartbeat; | |
63 | module_param(heartbeat, int, 0); | |
64 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")"); | |
65 | ||
66 | #ifdef CONFIG_WATCHDOG_NOWAYOUT | |
67 | static int nowayout = 1; | |
68 | #else | |
69 | static int nowayout = 0; | |
70 | #endif | |
71 | ||
72 | module_param(nowayout, int, 0); | |
73 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); | |
74 | ||
75 | /* You must set these - there is no sane way to probe for this board. */ | |
76 | static int io=0x240; | |
77 | static int irq=11; | |
78 | ||
79 | module_param(io, int, 0); | |
80 | MODULE_PARM_DESC(io, "WDT io port (default=0x240)"); | |
81 | module_param(irq, int, 0); | |
82 | MODULE_PARM_DESC(irq, "WDT irq (default=11)"); | |
83 | ||
84 | #ifdef CONFIG_WDT_501 | |
85 | /* Support for the Fan Tachometer on the WDT501-P */ | |
86 | static int tachometer; | |
87 | ||
88 | module_param(tachometer, int, 0); | |
89 | MODULE_PARM_DESC(tachometer, "WDT501-P Fan Tachometer support (0=disable, default=0)"); | |
90 | #endif /* CONFIG_WDT_501 */ | |
91 | ||
92 | /* | |
93 | * Programming support | |
94 | */ | |
95 | ||
96 | static void wdt_ctr_mode(int ctr, int mode) | |
97 | { | |
98 | ctr<<=6; | |
99 | ctr|=0x30; | |
100 | ctr|=(mode<<1); | |
101 | outb_p(ctr, WDT_CR); | |
102 | } | |
103 | ||
104 | static void wdt_ctr_load(int ctr, int val) | |
105 | { | |
106 | outb_p(val&0xFF, WDT_COUNT0+ctr); | |
107 | outb_p(val>>8, WDT_COUNT0+ctr); | |
108 | } | |
109 | ||
110 | /** | |
111 | * wdt_start: | |
112 | * | |
113 | * Start the watchdog driver. | |
114 | */ | |
115 | ||
116 | static int wdt_start(void) | |
117 | { | |
118 | inb_p(WDT_DC); /* Disable watchdog */ | |
119 | wdt_ctr_mode(0,3); /* Program CTR0 for Mode 3: Square Wave Generator */ | |
120 | wdt_ctr_mode(1,2); /* Program CTR1 for Mode 2: Rate Generator */ | |
121 | wdt_ctr_mode(2,0); /* Program CTR2 for Mode 0: Pulse on Terminal Count */ | |
122 | wdt_ctr_load(0, 8948); /* Count at 100Hz */ | |
123 | wdt_ctr_load(1,wd_heartbeat); /* Heartbeat */ | |
124 | wdt_ctr_load(2,65535); /* Length of reset pulse */ | |
125 | outb_p(0, WDT_DC); /* Enable watchdog */ | |
126 | return 0; | |
127 | } | |
128 | ||
129 | /** | |
130 | * wdt_stop: | |
131 | * | |
132 | * Stop the watchdog driver. | |
133 | */ | |
134 | ||
135 | static int wdt_stop (void) | |
136 | { | |
137 | /* Turn the card off */ | |
138 | inb_p(WDT_DC); /* Disable watchdog */ | |
139 | wdt_ctr_load(2,0); /* 0 length reset pulses now */ | |
140 | return 0; | |
141 | } | |
142 | ||
143 | /** | |
144 | * wdt_ping: | |
145 | * | |
146 | * Reload counter one with the watchdog heartbeat. We don't bother reloading | |
147 | * the cascade counter. | |
148 | */ | |
149 | ||
150 | static int wdt_ping(void) | |
151 | { | |
152 | /* Write a watchdog value */ | |
153 | inb_p(WDT_DC); /* Disable watchdog */ | |
154 | wdt_ctr_mode(1,2); /* Re-Program CTR1 for Mode 2: Rate Generator */ | |
155 | wdt_ctr_load(1,wd_heartbeat); /* Heartbeat */ | |
156 | outb_p(0, WDT_DC); /* Enable watchdog */ | |
157 | return 0; | |
158 | } | |
159 | ||
160 | /** | |
161 | * wdt_set_heartbeat: | |
162 | * @t: the new heartbeat value that needs to be set. | |
163 | * | |
164 | * Set a new heartbeat value for the watchdog device. If the heartbeat value is | |
165 | * incorrect we keep the old value and return -EINVAL. If successfull we | |
166 | * return 0. | |
167 | */ | |
168 | static int wdt_set_heartbeat(int t) | |
169 | { | |
170 | if ((t < 1) || (t > 65535)) | |
171 | return -EINVAL; | |
172 | ||
173 | heartbeat = t; | |
174 | wd_heartbeat = t * 100; | |
175 | return 0; | |
176 | } | |
177 | ||
178 | /** | |
179 | * wdt_get_status: | |
180 | * @status: the new status. | |
181 | * | |
182 | * Extract the status information from a WDT watchdog device. There are | |
183 | * several board variants so we have to know which bits are valid. Some | |
184 | * bits default to one and some to zero in order to be maximally painful. | |
185 | * | |
186 | * we then map the bits onto the status ioctl flags. | |
187 | */ | |
188 | ||
189 | static int wdt_get_status(int *status) | |
190 | { | |
191 | unsigned char new_status=inb_p(WDT_SR); | |
192 | ||
193 | *status=0; | |
194 | if (new_status & WDC_SR_ISOI0) | |
195 | *status |= WDIOF_EXTERN1; | |
196 | if (new_status & WDC_SR_ISII1) | |
197 | *status |= WDIOF_EXTERN2; | |
198 | #ifdef CONFIG_WDT_501 | |
199 | if (!(new_status & WDC_SR_TGOOD)) | |
200 | *status |= WDIOF_OVERHEAT; | |
201 | if (!(new_status & WDC_SR_PSUOVER)) | |
202 | *status |= WDIOF_POWEROVER; | |
203 | if (!(new_status & WDC_SR_PSUUNDR)) | |
204 | *status |= WDIOF_POWERUNDER; | |
205 | if (tachometer) { | |
206 | if (!(new_status & WDC_SR_FANGOOD)) | |
207 | *status |= WDIOF_FANFAULT; | |
208 | } | |
209 | #endif /* CONFIG_WDT_501 */ | |
210 | return 0; | |
211 | } | |
212 | ||
213 | #ifdef CONFIG_WDT_501 | |
214 | /** | |
215 | * wdt_get_temperature: | |
216 | * | |
217 | * Reports the temperature in degrees Fahrenheit. The API is in | |
218 | * farenheit. It was designed by an imperial measurement luddite. | |
219 | */ | |
220 | ||
221 | static int wdt_get_temperature(int *temperature) | |
222 | { | |
223 | unsigned short c=inb_p(WDT_RT); | |
224 | ||
225 | *temperature = (c * 11 / 15) + 7; | |
226 | return 0; | |
227 | } | |
228 | #endif /* CONFIG_WDT_501 */ | |
229 | ||
230 | /** | |
231 | * wdt_interrupt: | |
232 | * @irq: Interrupt number | |
233 | * @dev_id: Unused as we don't allow multiple devices. | |
234 | * @regs: Unused. | |
235 | * | |
236 | * Handle an interrupt from the board. These are raised when the status | |
237 | * map changes in what the board considers an interesting way. That means | |
238 | * a failure condition occurring. | |
239 | */ | |
240 | ||
241 | static irqreturn_t wdt_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
242 | { | |
243 | /* | |
244 | * Read the status register see what is up and | |
245 | * then printk it. | |
246 | */ | |
247 | unsigned char status=inb_p(WDT_SR); | |
248 | ||
249 | printk(KERN_CRIT "WDT status %d\n", status); | |
250 | ||
251 | #ifdef CONFIG_WDT_501 | |
252 | if (!(status & WDC_SR_TGOOD)) | |
253 | printk(KERN_CRIT "Overheat alarm.(%d)\n",inb_p(WDT_RT)); | |
254 | if (!(status & WDC_SR_PSUOVER)) | |
255 | printk(KERN_CRIT "PSU over voltage.\n"); | |
256 | if (!(status & WDC_SR_PSUUNDR)) | |
257 | printk(KERN_CRIT "PSU under voltage.\n"); | |
258 | if (tachometer) { | |
259 | if (!(status & WDC_SR_FANGOOD)) | |
260 | printk(KERN_CRIT "Possible fan fault.\n"); | |
261 | } | |
262 | #endif /* CONFIG_WDT_501 */ | |
263 | if (!(status & WDC_SR_WCCR)) | |
264 | #ifdef SOFTWARE_REBOOT | |
265 | #ifdef ONLY_TESTING | |
266 | printk(KERN_CRIT "Would Reboot.\n"); | |
267 | #else | |
268 | printk(KERN_CRIT "Initiating system reboot.\n"); | |
269 | machine_restart(NULL); | |
270 | #endif | |
271 | #else | |
272 | printk(KERN_CRIT "Reset in 5ms.\n"); | |
273 | #endif | |
274 | return IRQ_HANDLED; | |
275 | } | |
276 | ||
277 | ||
278 | /** | |
279 | * wdt_write: | |
280 | * @file: file handle to the watchdog | |
281 | * @buf: buffer to write (unused as data does not matter here | |
282 | * @count: count of bytes | |
283 | * @ppos: pointer to the position to write. No seeks allowed | |
284 | * | |
285 | * A write to a watchdog device is defined as a keepalive signal. Any | |
286 | * write of data will do, as we we don't define content meaning. | |
287 | */ | |
288 | ||
289 | static ssize_t wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
290 | { | |
291 | if(count) { | |
292 | if (!nowayout) { | |
293 | size_t i; | |
294 | ||
295 | /* In case it was set long ago */ | |
296 | expect_close = 0; | |
297 | ||
298 | for (i = 0; i != count; i++) { | |
299 | char c; | |
300 | if (get_user(c, buf + i)) | |
301 | return -EFAULT; | |
302 | if (c == 'V') | |
303 | expect_close = 42; | |
304 | } | |
305 | } | |
306 | wdt_ping(); | |
307 | } | |
308 | return count; | |
309 | } | |
310 | ||
311 | /** | |
312 | * wdt_ioctl: | |
313 | * @inode: inode of the device | |
314 | * @file: file handle to the device | |
315 | * @cmd: watchdog command | |
316 | * @arg: argument pointer | |
317 | * | |
318 | * The watchdog API defines a common set of functions for all watchdogs | |
319 | * according to their available features. We only actually usefully support | |
320 | * querying capabilities and current status. | |
321 | */ | |
322 | ||
323 | static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
324 | unsigned long arg) | |
325 | { | |
326 | void __user *argp = (void __user *)arg; | |
327 | int __user *p = argp; | |
328 | int new_heartbeat; | |
329 | int status; | |
330 | ||
331 | static struct watchdog_info ident = { | |
332 | .options = WDIOF_SETTIMEOUT| | |
333 | WDIOF_MAGICCLOSE| | |
334 | WDIOF_KEEPALIVEPING, | |
335 | .firmware_version = 1, | |
336 | .identity = "WDT500/501", | |
337 | }; | |
338 | ||
339 | /* Add options according to the card we have */ | |
340 | ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2); | |
341 | #ifdef CONFIG_WDT_501 | |
342 | ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER); | |
343 | if (tachometer) | |
344 | ident.options |= WDIOF_FANFAULT; | |
345 | #endif /* CONFIG_WDT_501 */ | |
346 | ||
347 | switch(cmd) | |
348 | { | |
349 | default: | |
350 | return -ENOIOCTLCMD; | |
351 | case WDIOC_GETSUPPORT: | |
352 | return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0; | |
353 | ||
354 | case WDIOC_GETSTATUS: | |
355 | wdt_get_status(&status); | |
356 | return put_user(status, p); | |
357 | case WDIOC_GETBOOTSTATUS: | |
358 | return put_user(0, p); | |
359 | case WDIOC_KEEPALIVE: | |
360 | wdt_ping(); | |
361 | return 0; | |
362 | case WDIOC_SETTIMEOUT: | |
363 | if (get_user(new_heartbeat, p)) | |
364 | return -EFAULT; | |
365 | ||
366 | if (wdt_set_heartbeat(new_heartbeat)) | |
367 | return -EINVAL; | |
368 | ||
369 | wdt_ping(); | |
370 | /* Fall */ | |
371 | case WDIOC_GETTIMEOUT: | |
372 | return put_user(heartbeat, p); | |
373 | } | |
374 | } | |
375 | ||
376 | /** | |
377 | * wdt_open: | |
378 | * @inode: inode of device | |
379 | * @file: file handle to device | |
380 | * | |
381 | * The watchdog device has been opened. The watchdog device is single | |
382 | * open and on opening we load the counters. Counter zero is a 100Hz | |
383 | * cascade, into counter 1 which downcounts to reboot. When the counter | |
384 | * triggers counter 2 downcounts the length of the reset pulse which | |
385 | * set set to be as long as possible. | |
386 | */ | |
387 | ||
388 | static int wdt_open(struct inode *inode, struct file *file) | |
389 | { | |
390 | if(test_and_set_bit(0, &wdt_is_open)) | |
391 | return -EBUSY; | |
392 | /* | |
393 | * Activate | |
394 | */ | |
395 | wdt_start(); | |
396 | return nonseekable_open(inode, file); | |
397 | } | |
398 | ||
399 | /** | |
400 | * wdt_release: | |
401 | * @inode: inode to board | |
402 | * @file: file handle to board | |
403 | * | |
404 | * The watchdog has a configurable API. There is a religious dispute | |
405 | * between people who want their watchdog to be able to shut down and | |
406 | * those who want to be sure if the watchdog manager dies the machine | |
407 | * reboots. In the former case we disable the counters, in the latter | |
408 | * case you have to open it again very soon. | |
409 | */ | |
410 | ||
411 | static int wdt_release(struct inode *inode, struct file *file) | |
412 | { | |
413 | if (expect_close == 42) { | |
414 | wdt_stop(); | |
415 | clear_bit(0, &wdt_is_open); | |
416 | } else { | |
417 | printk(KERN_CRIT "wdt: WDT device closed unexpectedly. WDT will not stop!\n"); | |
418 | wdt_ping(); | |
419 | } | |
420 | expect_close = 0; | |
421 | return 0; | |
422 | } | |
423 | ||
424 | #ifdef CONFIG_WDT_501 | |
425 | /** | |
426 | * wdt_temp_read: | |
427 | * @file: file handle to the watchdog board | |
428 | * @buf: buffer to write 1 byte into | |
429 | * @count: length of buffer | |
430 | * @ptr: offset (no seek allowed) | |
431 | * | |
432 | * Temp_read reports the temperature in degrees Fahrenheit. The API is in | |
433 | * farenheit. It was designed by an imperial measurement luddite. | |
434 | */ | |
435 | ||
436 | static ssize_t wdt_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr) | |
437 | { | |
438 | int temperature; | |
439 | ||
440 | if (wdt_get_temperature(&temperature)) | |
441 | return -EFAULT; | |
442 | ||
443 | if (copy_to_user (buf, &temperature, 1)) | |
444 | return -EFAULT; | |
445 | ||
446 | return 1; | |
447 | } | |
448 | ||
449 | /** | |
450 | * wdt_temp_open: | |
451 | * @inode: inode of device | |
452 | * @file: file handle to device | |
453 | * | |
454 | * The temperature device has been opened. | |
455 | */ | |
456 | ||
457 | static int wdt_temp_open(struct inode *inode, struct file *file) | |
458 | { | |
459 | return nonseekable_open(inode, file); | |
460 | } | |
461 | ||
462 | /** | |
463 | * wdt_temp_release: | |
464 | * @inode: inode to board | |
465 | * @file: file handle to board | |
466 | * | |
467 | * The temperature device has been closed. | |
468 | */ | |
469 | ||
470 | static int wdt_temp_release(struct inode *inode, struct file *file) | |
471 | { | |
472 | return 0; | |
473 | } | |
474 | #endif /* CONFIG_WDT_501 */ | |
475 | ||
476 | /** | |
477 | * notify_sys: | |
478 | * @this: our notifier block | |
479 | * @code: the event being reported | |
480 | * @unused: unused | |
481 | * | |
482 | * Our notifier is called on system shutdowns. We want to turn the card | |
483 | * off at reboot otherwise the machine will reboot again during memory | |
484 | * test or worse yet during the following fsck. This would suck, in fact | |
485 | * trust me - if it happens it does suck. | |
486 | */ | |
487 | ||
488 | static int wdt_notify_sys(struct notifier_block *this, unsigned long code, | |
489 | void *unused) | |
490 | { | |
491 | if(code==SYS_DOWN || code==SYS_HALT) { | |
492 | /* Turn the card off */ | |
493 | wdt_stop(); | |
494 | } | |
495 | return NOTIFY_DONE; | |
496 | } | |
497 | ||
498 | /* | |
499 | * Kernel Interfaces | |
500 | */ | |
501 | ||
502 | ||
503 | static struct file_operations wdt_fops = { | |
504 | .owner = THIS_MODULE, | |
505 | .llseek = no_llseek, | |
506 | .write = wdt_write, | |
507 | .ioctl = wdt_ioctl, | |
508 | .open = wdt_open, | |
509 | .release = wdt_release, | |
510 | }; | |
511 | ||
512 | static struct miscdevice wdt_miscdev = { | |
513 | .minor = WATCHDOG_MINOR, | |
514 | .name = "watchdog", | |
515 | .fops = &wdt_fops, | |
516 | }; | |
517 | ||
518 | #ifdef CONFIG_WDT_501 | |
519 | static struct file_operations wdt_temp_fops = { | |
520 | .owner = THIS_MODULE, | |
521 | .llseek = no_llseek, | |
522 | .read = wdt_temp_read, | |
523 | .open = wdt_temp_open, | |
524 | .release = wdt_temp_release, | |
525 | }; | |
526 | ||
527 | static struct miscdevice temp_miscdev = { | |
528 | .minor = TEMP_MINOR, | |
529 | .name = "temperature", | |
530 | .fops = &wdt_temp_fops, | |
531 | }; | |
532 | #endif /* CONFIG_WDT_501 */ | |
533 | ||
534 | /* | |
535 | * The WDT card needs to learn about soft shutdowns in order to | |
536 | * turn the timebomb registers off. | |
537 | */ | |
538 | ||
539 | static struct notifier_block wdt_notifier = { | |
540 | .notifier_call = wdt_notify_sys, | |
541 | }; | |
542 | ||
543 | /** | |
544 | * cleanup_module: | |
545 | * | |
546 | * Unload the watchdog. You cannot do this with any file handles open. | |
547 | * If your watchdog is set to continue ticking on close and you unload | |
548 | * it, well it keeps ticking. We won't get the interrupt but the board | |
549 | * will not touch PC memory so all is fine. You just have to load a new | |
550 | * module in 60 seconds or reboot. | |
551 | */ | |
552 | ||
553 | static void __exit wdt_exit(void) | |
554 | { | |
555 | misc_deregister(&wdt_miscdev); | |
556 | #ifdef CONFIG_WDT_501 | |
557 | misc_deregister(&temp_miscdev); | |
558 | #endif /* CONFIG_WDT_501 */ | |
559 | unregister_reboot_notifier(&wdt_notifier); | |
560 | free_irq(irq, NULL); | |
561 | release_region(io,8); | |
562 | } | |
563 | ||
564 | /** | |
565 | * wdt_init: | |
566 | * | |
567 | * Set up the WDT watchdog board. All we have to do is grab the | |
568 | * resources we require and bitch if anyone beat us to them. | |
569 | * The open() function will actually kick the board off. | |
570 | */ | |
571 | ||
572 | static int __init wdt_init(void) | |
573 | { | |
574 | int ret; | |
575 | ||
576 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ | |
577 | if (wdt_set_heartbeat(heartbeat)) { | |
578 | wdt_set_heartbeat(WD_TIMO); | |
579 | printk(KERN_INFO "wdt: heartbeat value must be 0<heartbeat<65536, using %d\n", | |
580 | WD_TIMO); | |
581 | } | |
582 | ||
583 | if (!request_region(io, 8, "wdt501p")) { | |
584 | printk(KERN_ERR "wdt: I/O address 0x%04x already in use\n", io); | |
585 | ret = -EBUSY; | |
586 | goto out; | |
587 | } | |
588 | ||
589 | ret = request_irq(irq, wdt_interrupt, SA_INTERRUPT, "wdt501p", NULL); | |
590 | if(ret) { | |
591 | printk(KERN_ERR "wdt: IRQ %d is not free.\n", irq); | |
592 | goto outreg; | |
593 | } | |
594 | ||
595 | ret = register_reboot_notifier(&wdt_notifier); | |
596 | if(ret) { | |
597 | printk(KERN_ERR "wdt: cannot register reboot notifier (err=%d)\n", ret); | |
598 | goto outirq; | |
599 | } | |
600 | ||
601 | #ifdef CONFIG_WDT_501 | |
602 | ret = misc_register(&temp_miscdev); | |
603 | if (ret) { | |
604 | printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n", | |
605 | TEMP_MINOR, ret); | |
606 | goto outrbt; | |
607 | } | |
608 | #endif /* CONFIG_WDT_501 */ | |
609 | ||
610 | ret = misc_register(&wdt_miscdev); | |
611 | if (ret) { | |
612 | printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n", | |
613 | WATCHDOG_MINOR, ret); | |
614 | goto outmisc; | |
615 | } | |
616 | ||
617 | ret = 0; | |
618 | printk(KERN_INFO "WDT500/501-P driver 0.10 at 0x%04x (Interrupt %d). heartbeat=%d sec (nowayout=%d)\n", | |
619 | io, irq, heartbeat, nowayout); | |
620 | #ifdef CONFIG_WDT_501 | |
621 | printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled")); | |
622 | #endif /* CONFIG_WDT_501 */ | |
623 | ||
624 | out: | |
625 | return ret; | |
626 | ||
627 | outmisc: | |
628 | #ifdef CONFIG_WDT_501 | |
629 | misc_deregister(&temp_miscdev); | |
630 | outrbt: | |
631 | #endif /* CONFIG_WDT_501 */ | |
632 | unregister_reboot_notifier(&wdt_notifier); | |
633 | outirq: | |
634 | free_irq(irq, NULL); | |
635 | outreg: | |
636 | release_region(io,8); | |
637 | goto out; | |
638 | } | |
639 | ||
640 | module_init(wdt_init); | |
641 | module_exit(wdt_exit); | |
642 | ||
643 | MODULE_AUTHOR("Alan Cox"); | |
644 | MODULE_DESCRIPTION("Driver for ISA ICS watchdog cards (WDT500/501)"); | |
645 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
646 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); | |
647 | MODULE_LICENSE("GPL"); |