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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 | ||
1da177e4 LT |
34 | #include <linux/interrupt.h> |
35 | #include <linux/module.h> | |
36 | #include <linux/moduleparam.h> | |
37 | #include <linux/types.h> | |
38 | #include <linux/miscdevice.h> | |
39 | #include <linux/watchdog.h> | |
40 | #include <linux/fs.h> | |
41 | #include <linux/ioport.h> | |
42 | #include <linux/notifier.h> | |
43 | #include <linux/reboot.h> | |
44 | #include <linux/init.h> | |
45 | ||
46 | #include <asm/io.h> | |
47 | #include <asm/uaccess.h> | |
48 | #include <asm/system.h> | |
49 | #include "wd501p.h" | |
50 | ||
51 | static unsigned long wdt_is_open; | |
52 | static char expect_close; | |
53 | ||
54 | /* | |
55 | * Module parameters | |
56 | */ | |
57 | ||
58 | #define WD_TIMO 60 /* Default heartbeat = 60 seconds */ | |
59 | ||
60 | static int heartbeat = WD_TIMO; | |
61 | static int wd_heartbeat; | |
62 | module_param(heartbeat, int, 0); | |
63 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")"); | |
64 | ||
4bfdf378 | 65 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 LT |
66 | module_param(nowayout, int, 0); |
67 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); | |
68 | ||
69 | /* You must set these - there is no sane way to probe for this board. */ | |
70 | static int io=0x240; | |
71 | static int irq=11; | |
72 | ||
73 | module_param(io, int, 0); | |
74 | MODULE_PARM_DESC(io, "WDT io port (default=0x240)"); | |
75 | module_param(irq, int, 0); | |
76 | MODULE_PARM_DESC(irq, "WDT irq (default=11)"); | |
77 | ||
78 | #ifdef CONFIG_WDT_501 | |
79 | /* Support for the Fan Tachometer on the WDT501-P */ | |
80 | static int tachometer; | |
81 | ||
82 | module_param(tachometer, int, 0); | |
83 | MODULE_PARM_DESC(tachometer, "WDT501-P Fan Tachometer support (0=disable, default=0)"); | |
84 | #endif /* CONFIG_WDT_501 */ | |
85 | ||
86 | /* | |
87 | * Programming support | |
88 | */ | |
89 | ||
90 | static void wdt_ctr_mode(int ctr, int mode) | |
91 | { | |
92 | ctr<<=6; | |
93 | ctr|=0x30; | |
94 | ctr|=(mode<<1); | |
95 | outb_p(ctr, WDT_CR); | |
96 | } | |
97 | ||
98 | static void wdt_ctr_load(int ctr, int val) | |
99 | { | |
100 | outb_p(val&0xFF, WDT_COUNT0+ctr); | |
101 | outb_p(val>>8, WDT_COUNT0+ctr); | |
102 | } | |
103 | ||
104 | /** | |
105 | * wdt_start: | |
106 | * | |
107 | * Start the watchdog driver. | |
108 | */ | |
109 | ||
110 | static int wdt_start(void) | |
111 | { | |
112 | inb_p(WDT_DC); /* Disable watchdog */ | |
113 | wdt_ctr_mode(0,3); /* Program CTR0 for Mode 3: Square Wave Generator */ | |
114 | wdt_ctr_mode(1,2); /* Program CTR1 for Mode 2: Rate Generator */ | |
115 | wdt_ctr_mode(2,0); /* Program CTR2 for Mode 0: Pulse on Terminal Count */ | |
116 | wdt_ctr_load(0, 8948); /* Count at 100Hz */ | |
117 | wdt_ctr_load(1,wd_heartbeat); /* Heartbeat */ | |
118 | wdt_ctr_load(2,65535); /* Length of reset pulse */ | |
119 | outb_p(0, WDT_DC); /* Enable watchdog */ | |
120 | return 0; | |
121 | } | |
122 | ||
123 | /** | |
124 | * wdt_stop: | |
125 | * | |
126 | * Stop the watchdog driver. | |
127 | */ | |
128 | ||
129 | static int wdt_stop (void) | |
130 | { | |
131 | /* Turn the card off */ | |
132 | inb_p(WDT_DC); /* Disable watchdog */ | |
133 | wdt_ctr_load(2,0); /* 0 length reset pulses now */ | |
134 | return 0; | |
135 | } | |
136 | ||
137 | /** | |
138 | * wdt_ping: | |
139 | * | |
140 | * Reload counter one with the watchdog heartbeat. We don't bother reloading | |
141 | * the cascade counter. | |
142 | */ | |
143 | ||
144 | static int wdt_ping(void) | |
145 | { | |
146 | /* Write a watchdog value */ | |
147 | inb_p(WDT_DC); /* Disable watchdog */ | |
148 | wdt_ctr_mode(1,2); /* Re-Program CTR1 for Mode 2: Rate Generator */ | |
149 | wdt_ctr_load(1,wd_heartbeat); /* Heartbeat */ | |
150 | outb_p(0, WDT_DC); /* Enable watchdog */ | |
151 | return 0; | |
152 | } | |
153 | ||
154 | /** | |
155 | * wdt_set_heartbeat: | |
156 | * @t: the new heartbeat value that needs to be set. | |
157 | * | |
158 | * Set a new heartbeat value for the watchdog device. If the heartbeat value is | |
159 | * incorrect we keep the old value and return -EINVAL. If successfull we | |
160 | * return 0. | |
161 | */ | |
162 | static int wdt_set_heartbeat(int t) | |
163 | { | |
164 | if ((t < 1) || (t > 65535)) | |
165 | return -EINVAL; | |
166 | ||
167 | heartbeat = t; | |
168 | wd_heartbeat = t * 100; | |
169 | return 0; | |
170 | } | |
171 | ||
172 | /** | |
173 | * wdt_get_status: | |
174 | * @status: the new status. | |
175 | * | |
176 | * Extract the status information from a WDT watchdog device. There are | |
177 | * several board variants so we have to know which bits are valid. Some | |
178 | * bits default to one and some to zero in order to be maximally painful. | |
179 | * | |
180 | * we then map the bits onto the status ioctl flags. | |
181 | */ | |
182 | ||
183 | static int wdt_get_status(int *status) | |
184 | { | |
185 | unsigned char new_status=inb_p(WDT_SR); | |
186 | ||
187 | *status=0; | |
188 | if (new_status & WDC_SR_ISOI0) | |
189 | *status |= WDIOF_EXTERN1; | |
190 | if (new_status & WDC_SR_ISII1) | |
191 | *status |= WDIOF_EXTERN2; | |
192 | #ifdef CONFIG_WDT_501 | |
193 | if (!(new_status & WDC_SR_TGOOD)) | |
194 | *status |= WDIOF_OVERHEAT; | |
195 | if (!(new_status & WDC_SR_PSUOVER)) | |
196 | *status |= WDIOF_POWEROVER; | |
197 | if (!(new_status & WDC_SR_PSUUNDR)) | |
198 | *status |= WDIOF_POWERUNDER; | |
199 | if (tachometer) { | |
200 | if (!(new_status & WDC_SR_FANGOOD)) | |
201 | *status |= WDIOF_FANFAULT; | |
202 | } | |
203 | #endif /* CONFIG_WDT_501 */ | |
204 | return 0; | |
205 | } | |
206 | ||
207 | #ifdef CONFIG_WDT_501 | |
208 | /** | |
209 | * wdt_get_temperature: | |
210 | * | |
211 | * Reports the temperature in degrees Fahrenheit. The API is in | |
212 | * farenheit. It was designed by an imperial measurement luddite. | |
213 | */ | |
214 | ||
215 | static int wdt_get_temperature(int *temperature) | |
216 | { | |
217 | unsigned short c=inb_p(WDT_RT); | |
218 | ||
219 | *temperature = (c * 11 / 15) + 7; | |
220 | return 0; | |
221 | } | |
222 | #endif /* CONFIG_WDT_501 */ | |
223 | ||
224 | /** | |
225 | * wdt_interrupt: | |
226 | * @irq: Interrupt number | |
227 | * @dev_id: Unused as we don't allow multiple devices. | |
228 | * @regs: Unused. | |
229 | * | |
230 | * Handle an interrupt from the board. These are raised when the status | |
231 | * map changes in what the board considers an interesting way. That means | |
232 | * a failure condition occurring. | |
233 | */ | |
234 | ||
235 | static irqreturn_t wdt_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
236 | { | |
237 | /* | |
238 | * Read the status register see what is up and | |
239 | * then printk it. | |
240 | */ | |
241 | unsigned char status=inb_p(WDT_SR); | |
242 | ||
243 | printk(KERN_CRIT "WDT status %d\n", status); | |
244 | ||
245 | #ifdef CONFIG_WDT_501 | |
246 | if (!(status & WDC_SR_TGOOD)) | |
247 | printk(KERN_CRIT "Overheat alarm.(%d)\n",inb_p(WDT_RT)); | |
248 | if (!(status & WDC_SR_PSUOVER)) | |
249 | printk(KERN_CRIT "PSU over voltage.\n"); | |
250 | if (!(status & WDC_SR_PSUUNDR)) | |
251 | printk(KERN_CRIT "PSU under voltage.\n"); | |
252 | if (tachometer) { | |
253 | if (!(status & WDC_SR_FANGOOD)) | |
254 | printk(KERN_CRIT "Possible fan fault.\n"); | |
255 | } | |
256 | #endif /* CONFIG_WDT_501 */ | |
257 | if (!(status & WDC_SR_WCCR)) | |
258 | #ifdef SOFTWARE_REBOOT | |
259 | #ifdef ONLY_TESTING | |
260 | printk(KERN_CRIT "Would Reboot.\n"); | |
261 | #else | |
262 | printk(KERN_CRIT "Initiating system reboot.\n"); | |
f82567e5 | 263 | emergency_restart(); |
1da177e4 LT |
264 | #endif |
265 | #else | |
266 | printk(KERN_CRIT "Reset in 5ms.\n"); | |
267 | #endif | |
268 | return IRQ_HANDLED; | |
269 | } | |
270 | ||
271 | ||
272 | /** | |
273 | * wdt_write: | |
274 | * @file: file handle to the watchdog | |
275 | * @buf: buffer to write (unused as data does not matter here | |
276 | * @count: count of bytes | |
277 | * @ppos: pointer to the position to write. No seeks allowed | |
278 | * | |
279 | * A write to a watchdog device is defined as a keepalive signal. Any | |
280 | * write of data will do, as we we don't define content meaning. | |
281 | */ | |
282 | ||
283 | static ssize_t wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
284 | { | |
285 | if(count) { | |
286 | if (!nowayout) { | |
287 | size_t i; | |
288 | ||
289 | /* In case it was set long ago */ | |
290 | expect_close = 0; | |
291 | ||
292 | for (i = 0; i != count; i++) { | |
293 | char c; | |
294 | if (get_user(c, buf + i)) | |
295 | return -EFAULT; | |
296 | if (c == 'V') | |
297 | expect_close = 42; | |
298 | } | |
299 | } | |
300 | wdt_ping(); | |
301 | } | |
302 | return count; | |
303 | } | |
304 | ||
305 | /** | |
306 | * wdt_ioctl: | |
307 | * @inode: inode of the device | |
308 | * @file: file handle to the device | |
309 | * @cmd: watchdog command | |
310 | * @arg: argument pointer | |
311 | * | |
312 | * The watchdog API defines a common set of functions for all watchdogs | |
313 | * according to their available features. We only actually usefully support | |
314 | * querying capabilities and current status. | |
315 | */ | |
316 | ||
317 | static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
318 | unsigned long arg) | |
319 | { | |
320 | void __user *argp = (void __user *)arg; | |
321 | int __user *p = argp; | |
322 | int new_heartbeat; | |
323 | int status; | |
324 | ||
325 | static struct watchdog_info ident = { | |
326 | .options = WDIOF_SETTIMEOUT| | |
327 | WDIOF_MAGICCLOSE| | |
328 | WDIOF_KEEPALIVEPING, | |
329 | .firmware_version = 1, | |
330 | .identity = "WDT500/501", | |
331 | }; | |
332 | ||
333 | /* Add options according to the card we have */ | |
334 | ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2); | |
335 | #ifdef CONFIG_WDT_501 | |
336 | ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER); | |
337 | if (tachometer) | |
338 | ident.options |= WDIOF_FANFAULT; | |
339 | #endif /* CONFIG_WDT_501 */ | |
340 | ||
341 | switch(cmd) | |
342 | { | |
343 | default: | |
344 | return -ENOIOCTLCMD; | |
345 | case WDIOC_GETSUPPORT: | |
346 | return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0; | |
347 | ||
348 | case WDIOC_GETSTATUS: | |
349 | wdt_get_status(&status); | |
350 | return put_user(status, p); | |
351 | case WDIOC_GETBOOTSTATUS: | |
352 | return put_user(0, p); | |
353 | case WDIOC_KEEPALIVE: | |
354 | wdt_ping(); | |
355 | return 0; | |
356 | case WDIOC_SETTIMEOUT: | |
357 | if (get_user(new_heartbeat, p)) | |
358 | return -EFAULT; | |
359 | ||
360 | if (wdt_set_heartbeat(new_heartbeat)) | |
361 | return -EINVAL; | |
362 | ||
363 | wdt_ping(); | |
364 | /* Fall */ | |
365 | case WDIOC_GETTIMEOUT: | |
366 | return put_user(heartbeat, p); | |
367 | } | |
368 | } | |
369 | ||
370 | /** | |
371 | * wdt_open: | |
372 | * @inode: inode of device | |
373 | * @file: file handle to device | |
374 | * | |
375 | * The watchdog device has been opened. The watchdog device is single | |
376 | * open and on opening we load the counters. Counter zero is a 100Hz | |
377 | * cascade, into counter 1 which downcounts to reboot. When the counter | |
378 | * triggers counter 2 downcounts the length of the reset pulse which | |
379 | * set set to be as long as possible. | |
380 | */ | |
381 | ||
382 | static int wdt_open(struct inode *inode, struct file *file) | |
383 | { | |
384 | if(test_and_set_bit(0, &wdt_is_open)) | |
385 | return -EBUSY; | |
386 | /* | |
387 | * Activate | |
388 | */ | |
389 | wdt_start(); | |
390 | return nonseekable_open(inode, file); | |
391 | } | |
392 | ||
393 | /** | |
394 | * wdt_release: | |
395 | * @inode: inode to board | |
396 | * @file: file handle to board | |
397 | * | |
398 | * The watchdog has a configurable API. There is a religious dispute | |
399 | * between people who want their watchdog to be able to shut down and | |
400 | * those who want to be sure if the watchdog manager dies the machine | |
401 | * reboots. In the former case we disable the counters, in the latter | |
402 | * case you have to open it again very soon. | |
403 | */ | |
404 | ||
405 | static int wdt_release(struct inode *inode, struct file *file) | |
406 | { | |
407 | if (expect_close == 42) { | |
408 | wdt_stop(); | |
409 | clear_bit(0, &wdt_is_open); | |
410 | } else { | |
411 | printk(KERN_CRIT "wdt: WDT device closed unexpectedly. WDT will not stop!\n"); | |
412 | wdt_ping(); | |
413 | } | |
414 | expect_close = 0; | |
415 | return 0; | |
416 | } | |
417 | ||
418 | #ifdef CONFIG_WDT_501 | |
419 | /** | |
420 | * wdt_temp_read: | |
421 | * @file: file handle to the watchdog board | |
422 | * @buf: buffer to write 1 byte into | |
423 | * @count: length of buffer | |
424 | * @ptr: offset (no seek allowed) | |
425 | * | |
426 | * Temp_read reports the temperature in degrees Fahrenheit. The API is in | |
427 | * farenheit. It was designed by an imperial measurement luddite. | |
428 | */ | |
429 | ||
430 | static ssize_t wdt_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr) | |
431 | { | |
432 | int temperature; | |
433 | ||
434 | if (wdt_get_temperature(&temperature)) | |
435 | return -EFAULT; | |
436 | ||
437 | if (copy_to_user (buf, &temperature, 1)) | |
438 | return -EFAULT; | |
439 | ||
440 | return 1; | |
441 | } | |
442 | ||
443 | /** | |
444 | * wdt_temp_open: | |
445 | * @inode: inode of device | |
446 | * @file: file handle to device | |
447 | * | |
448 | * The temperature device has been opened. | |
449 | */ | |
450 | ||
451 | static int wdt_temp_open(struct inode *inode, struct file *file) | |
452 | { | |
453 | return nonseekable_open(inode, file); | |
454 | } | |
455 | ||
456 | /** | |
457 | * wdt_temp_release: | |
458 | * @inode: inode to board | |
459 | * @file: file handle to board | |
460 | * | |
461 | * The temperature device has been closed. | |
462 | */ | |
463 | ||
464 | static int wdt_temp_release(struct inode *inode, struct file *file) | |
465 | { | |
466 | return 0; | |
467 | } | |
468 | #endif /* CONFIG_WDT_501 */ | |
469 | ||
470 | /** | |
471 | * notify_sys: | |
472 | * @this: our notifier block | |
473 | * @code: the event being reported | |
474 | * @unused: unused | |
475 | * | |
476 | * Our notifier is called on system shutdowns. We want to turn the card | |
477 | * off at reboot otherwise the machine will reboot again during memory | |
478 | * test or worse yet during the following fsck. This would suck, in fact | |
479 | * trust me - if it happens it does suck. | |
480 | */ | |
481 | ||
482 | static int wdt_notify_sys(struct notifier_block *this, unsigned long code, | |
483 | void *unused) | |
484 | { | |
485 | if(code==SYS_DOWN || code==SYS_HALT) { | |
486 | /* Turn the card off */ | |
487 | wdt_stop(); | |
488 | } | |
489 | return NOTIFY_DONE; | |
490 | } | |
491 | ||
492 | /* | |
493 | * Kernel Interfaces | |
494 | */ | |
495 | ||
496 | ||
497 | static struct file_operations wdt_fops = { | |
498 | .owner = THIS_MODULE, | |
499 | .llseek = no_llseek, | |
500 | .write = wdt_write, | |
501 | .ioctl = wdt_ioctl, | |
502 | .open = wdt_open, | |
503 | .release = wdt_release, | |
504 | }; | |
505 | ||
506 | static struct miscdevice wdt_miscdev = { | |
507 | .minor = WATCHDOG_MINOR, | |
508 | .name = "watchdog", | |
509 | .fops = &wdt_fops, | |
510 | }; | |
511 | ||
512 | #ifdef CONFIG_WDT_501 | |
513 | static struct file_operations wdt_temp_fops = { | |
514 | .owner = THIS_MODULE, | |
515 | .llseek = no_llseek, | |
516 | .read = wdt_temp_read, | |
517 | .open = wdt_temp_open, | |
518 | .release = wdt_temp_release, | |
519 | }; | |
520 | ||
521 | static struct miscdevice temp_miscdev = { | |
522 | .minor = TEMP_MINOR, | |
523 | .name = "temperature", | |
524 | .fops = &wdt_temp_fops, | |
525 | }; | |
526 | #endif /* CONFIG_WDT_501 */ | |
527 | ||
528 | /* | |
529 | * The WDT card needs to learn about soft shutdowns in order to | |
530 | * turn the timebomb registers off. | |
531 | */ | |
532 | ||
533 | static struct notifier_block wdt_notifier = { | |
534 | .notifier_call = wdt_notify_sys, | |
535 | }; | |
536 | ||
537 | /** | |
538 | * cleanup_module: | |
539 | * | |
540 | * Unload the watchdog. You cannot do this with any file handles open. | |
541 | * If your watchdog is set to continue ticking on close and you unload | |
542 | * it, well it keeps ticking. We won't get the interrupt but the board | |
543 | * will not touch PC memory so all is fine. You just have to load a new | |
544 | * module in 60 seconds or reboot. | |
545 | */ | |
546 | ||
547 | static void __exit wdt_exit(void) | |
548 | { | |
549 | misc_deregister(&wdt_miscdev); | |
550 | #ifdef CONFIG_WDT_501 | |
551 | misc_deregister(&temp_miscdev); | |
552 | #endif /* CONFIG_WDT_501 */ | |
553 | unregister_reboot_notifier(&wdt_notifier); | |
554 | free_irq(irq, NULL); | |
555 | release_region(io,8); | |
556 | } | |
557 | ||
558 | /** | |
559 | * wdt_init: | |
560 | * | |
561 | * Set up the WDT watchdog board. All we have to do is grab the | |
562 | * resources we require and bitch if anyone beat us to them. | |
563 | * The open() function will actually kick the board off. | |
564 | */ | |
565 | ||
566 | static int __init wdt_init(void) | |
567 | { | |
568 | int ret; | |
569 | ||
570 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ | |
571 | if (wdt_set_heartbeat(heartbeat)) { | |
572 | wdt_set_heartbeat(WD_TIMO); | |
573 | printk(KERN_INFO "wdt: heartbeat value must be 0<heartbeat<65536, using %d\n", | |
574 | WD_TIMO); | |
575 | } | |
576 | ||
577 | if (!request_region(io, 8, "wdt501p")) { | |
578 | printk(KERN_ERR "wdt: I/O address 0x%04x already in use\n", io); | |
579 | ret = -EBUSY; | |
580 | goto out; | |
581 | } | |
582 | ||
583 | ret = request_irq(irq, wdt_interrupt, SA_INTERRUPT, "wdt501p", NULL); | |
584 | if(ret) { | |
585 | printk(KERN_ERR "wdt: IRQ %d is not free.\n", irq); | |
586 | goto outreg; | |
587 | } | |
588 | ||
589 | ret = register_reboot_notifier(&wdt_notifier); | |
590 | if(ret) { | |
591 | printk(KERN_ERR "wdt: cannot register reboot notifier (err=%d)\n", ret); | |
592 | goto outirq; | |
593 | } | |
594 | ||
595 | #ifdef CONFIG_WDT_501 | |
596 | ret = misc_register(&temp_miscdev); | |
597 | if (ret) { | |
598 | printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n", | |
599 | TEMP_MINOR, ret); | |
600 | goto outrbt; | |
601 | } | |
602 | #endif /* CONFIG_WDT_501 */ | |
603 | ||
604 | ret = misc_register(&wdt_miscdev); | |
605 | if (ret) { | |
606 | printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n", | |
607 | WATCHDOG_MINOR, ret); | |
608 | goto outmisc; | |
609 | } | |
610 | ||
611 | ret = 0; | |
612 | printk(KERN_INFO "WDT500/501-P driver 0.10 at 0x%04x (Interrupt %d). heartbeat=%d sec (nowayout=%d)\n", | |
613 | io, irq, heartbeat, nowayout); | |
614 | #ifdef CONFIG_WDT_501 | |
615 | printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled")); | |
616 | #endif /* CONFIG_WDT_501 */ | |
617 | ||
618 | out: | |
619 | return ret; | |
620 | ||
621 | outmisc: | |
622 | #ifdef CONFIG_WDT_501 | |
623 | misc_deregister(&temp_miscdev); | |
624 | outrbt: | |
625 | #endif /* CONFIG_WDT_501 */ | |
626 | unregister_reboot_notifier(&wdt_notifier); | |
627 | outirq: | |
628 | free_irq(irq, NULL); | |
629 | outreg: | |
630 | release_region(io,8); | |
631 | goto out; | |
632 | } | |
633 | ||
634 | module_init(wdt_init); | |
635 | module_exit(wdt_exit); | |
636 | ||
637 | MODULE_AUTHOR("Alan Cox"); | |
638 | MODULE_DESCRIPTION("Driver for ISA ICS watchdog cards (WDT500/501)"); | |
639 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
640 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); | |
641 | MODULE_LICENSE("GPL"); |