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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 | 66 | module_param(nowayout, int, 0); |
bffda5c8 | 67 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
1da177e4 LT |
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 | ||
01c785dc AC |
73 | static DEFINE_SPINLOCK(wdt_lock); |
74 | ||
1da177e4 LT |
75 | module_param(io, int, 0); |
76 | MODULE_PARM_DESC(io, "WDT io port (default=0x240)"); | |
77 | module_param(irq, int, 0); | |
78 | MODULE_PARM_DESC(irq, "WDT irq (default=11)"); | |
79 | ||
80 | #ifdef CONFIG_WDT_501 | |
81 | /* Support for the Fan Tachometer on the WDT501-P */ | |
82 | static int tachometer; | |
83 | ||
84 | module_param(tachometer, int, 0); | |
85 | MODULE_PARM_DESC(tachometer, "WDT501-P Fan Tachometer support (0=disable, default=0)"); | |
86 | #endif /* CONFIG_WDT_501 */ | |
87 | ||
88 | /* | |
89 | * Programming support | |
90 | */ | |
91 | ||
92 | static void wdt_ctr_mode(int ctr, int mode) | |
93 | { | |
94 | ctr<<=6; | |
95 | ctr|=0x30; | |
96 | ctr|=(mode<<1); | |
97 | outb_p(ctr, WDT_CR); | |
98 | } | |
99 | ||
100 | static void wdt_ctr_load(int ctr, int val) | |
101 | { | |
102 | outb_p(val&0xFF, WDT_COUNT0+ctr); | |
103 | outb_p(val>>8, WDT_COUNT0+ctr); | |
104 | } | |
105 | ||
106 | /** | |
107 | * wdt_start: | |
108 | * | |
109 | * Start the watchdog driver. | |
110 | */ | |
111 | ||
112 | static int wdt_start(void) | |
113 | { | |
01c785dc AC |
114 | unsigned long flags; |
115 | spin_lock_irqsave(&wdt_lock, flags); | |
1da177e4 LT |
116 | inb_p(WDT_DC); /* Disable watchdog */ |
117 | wdt_ctr_mode(0,3); /* Program CTR0 for Mode 3: Square Wave Generator */ | |
118 | wdt_ctr_mode(1,2); /* Program CTR1 for Mode 2: Rate Generator */ | |
119 | wdt_ctr_mode(2,0); /* Program CTR2 for Mode 0: Pulse on Terminal Count */ | |
120 | wdt_ctr_load(0, 8948); /* Count at 100Hz */ | |
121 | wdt_ctr_load(1,wd_heartbeat); /* Heartbeat */ | |
122 | wdt_ctr_load(2,65535); /* Length of reset pulse */ | |
123 | outb_p(0, WDT_DC); /* Enable watchdog */ | |
01c785dc | 124 | spin_unlock_irqrestore(&wdt_lock, flags); |
1da177e4 LT |
125 | return 0; |
126 | } | |
127 | ||
128 | /** | |
129 | * wdt_stop: | |
130 | * | |
131 | * Stop the watchdog driver. | |
132 | */ | |
133 | ||
134 | static int wdt_stop (void) | |
135 | { | |
01c785dc AC |
136 | unsigned long flags; |
137 | spin_lock_irqsave(&wdt_lock, flags); | |
1da177e4 LT |
138 | /* Turn the card off */ |
139 | inb_p(WDT_DC); /* Disable watchdog */ | |
140 | wdt_ctr_load(2,0); /* 0 length reset pulses now */ | |
01c785dc | 141 | spin_unlock_irqrestore(&wdt_lock, flags); |
1da177e4 LT |
142 | return 0; |
143 | } | |
144 | ||
145 | /** | |
146 | * wdt_ping: | |
147 | * | |
148 | * Reload counter one with the watchdog heartbeat. We don't bother reloading | |
149 | * the cascade counter. | |
150 | */ | |
151 | ||
152 | static int wdt_ping(void) | |
153 | { | |
01c785dc AC |
154 | unsigned long flags; |
155 | spin_lock_irqsave(&wdt_lock, flags); | |
1da177e4 LT |
156 | /* Write a watchdog value */ |
157 | inb_p(WDT_DC); /* Disable watchdog */ | |
158 | wdt_ctr_mode(1,2); /* Re-Program CTR1 for Mode 2: Rate Generator */ | |
159 | wdt_ctr_load(1,wd_heartbeat); /* Heartbeat */ | |
160 | outb_p(0, WDT_DC); /* Enable watchdog */ | |
01c785dc | 161 | spin_unlock_irqrestore(&wdt_lock, flags); |
1da177e4 LT |
162 | return 0; |
163 | } | |
164 | ||
165 | /** | |
166 | * wdt_set_heartbeat: | |
167 | * @t: the new heartbeat value that needs to be set. | |
168 | * | |
169 | * Set a new heartbeat value for the watchdog device. If the heartbeat value is | |
170 | * incorrect we keep the old value and return -EINVAL. If successfull we | |
171 | * return 0. | |
172 | */ | |
173 | static int wdt_set_heartbeat(int t) | |
174 | { | |
175 | if ((t < 1) || (t > 65535)) | |
176 | return -EINVAL; | |
177 | ||
178 | heartbeat = t; | |
179 | wd_heartbeat = t * 100; | |
180 | return 0; | |
181 | } | |
182 | ||
183 | /** | |
184 | * wdt_get_status: | |
185 | * @status: the new status. | |
186 | * | |
187 | * Extract the status information from a WDT watchdog device. There are | |
188 | * several board variants so we have to know which bits are valid. Some | |
189 | * bits default to one and some to zero in order to be maximally painful. | |
190 | * | |
191 | * we then map the bits onto the status ioctl flags. | |
192 | */ | |
193 | ||
194 | static int wdt_get_status(int *status) | |
195 | { | |
01c785dc AC |
196 | unsigned char new_status; |
197 | unsigned long flags; | |
198 | ||
199 | spin_lock_irqsave(&wdt_lock, flags); | |
200 | new_status = inb_p(WDT_SR); | |
201 | spin_unlock_irqrestore(&wdt_lock, flags); | |
1da177e4 LT |
202 | |
203 | *status=0; | |
204 | if (new_status & WDC_SR_ISOI0) | |
205 | *status |= WDIOF_EXTERN1; | |
206 | if (new_status & WDC_SR_ISII1) | |
207 | *status |= WDIOF_EXTERN2; | |
208 | #ifdef CONFIG_WDT_501 | |
209 | if (!(new_status & WDC_SR_TGOOD)) | |
210 | *status |= WDIOF_OVERHEAT; | |
211 | if (!(new_status & WDC_SR_PSUOVER)) | |
212 | *status |= WDIOF_POWEROVER; | |
213 | if (!(new_status & WDC_SR_PSUUNDR)) | |
214 | *status |= WDIOF_POWERUNDER; | |
215 | if (tachometer) { | |
216 | if (!(new_status & WDC_SR_FANGOOD)) | |
217 | *status |= WDIOF_FANFAULT; | |
218 | } | |
219 | #endif /* CONFIG_WDT_501 */ | |
220 | return 0; | |
221 | } | |
222 | ||
223 | #ifdef CONFIG_WDT_501 | |
224 | /** | |
225 | * wdt_get_temperature: | |
226 | * | |
227 | * Reports the temperature in degrees Fahrenheit. The API is in | |
228 | * farenheit. It was designed by an imperial measurement luddite. | |
229 | */ | |
230 | ||
231 | static int wdt_get_temperature(int *temperature) | |
232 | { | |
01c785dc AC |
233 | unsigned short c; |
234 | unsigned long flags; | |
1da177e4 | 235 | |
01c785dc AC |
236 | spin_lock_irqsave(&wdt_lock, flags); |
237 | c = inb_p(WDT_RT); | |
238 | spin_unlock_irqrestore(&wdt_lock, flags); | |
1da177e4 LT |
239 | *temperature = (c * 11 / 15) + 7; |
240 | return 0; | |
241 | } | |
242 | #endif /* CONFIG_WDT_501 */ | |
243 | ||
244 | /** | |
245 | * wdt_interrupt: | |
246 | * @irq: Interrupt number | |
247 | * @dev_id: Unused as we don't allow multiple devices. | |
1da177e4 LT |
248 | * |
249 | * Handle an interrupt from the board. These are raised when the status | |
250 | * map changes in what the board considers an interesting way. That means | |
251 | * a failure condition occurring. | |
252 | */ | |
253 | ||
7d12e780 | 254 | static irqreturn_t wdt_interrupt(int irq, void *dev_id) |
1da177e4 LT |
255 | { |
256 | /* | |
257 | * Read the status register see what is up and | |
258 | * then printk it. | |
259 | */ | |
01c785dc AC |
260 | unsigned char status; |
261 | ||
262 | spin_lock(&wdt_lock); | |
263 | status = inb_p(WDT_SR); | |
1da177e4 LT |
264 | |
265 | printk(KERN_CRIT "WDT status %d\n", status); | |
266 | ||
267 | #ifdef CONFIG_WDT_501 | |
268 | if (!(status & WDC_SR_TGOOD)) | |
269 | printk(KERN_CRIT "Overheat alarm.(%d)\n",inb_p(WDT_RT)); | |
270 | if (!(status & WDC_SR_PSUOVER)) | |
271 | printk(KERN_CRIT "PSU over voltage.\n"); | |
272 | if (!(status & WDC_SR_PSUUNDR)) | |
273 | printk(KERN_CRIT "PSU under voltage.\n"); | |
274 | if (tachometer) { | |
275 | if (!(status & WDC_SR_FANGOOD)) | |
276 | printk(KERN_CRIT "Possible fan fault.\n"); | |
277 | } | |
278 | #endif /* CONFIG_WDT_501 */ | |
59338d4c | 279 | if (!(status & WDC_SR_WCCR)) { |
1da177e4 LT |
280 | #ifdef SOFTWARE_REBOOT |
281 | #ifdef ONLY_TESTING | |
282 | printk(KERN_CRIT "Would Reboot.\n"); | |
283 | #else | |
284 | printk(KERN_CRIT "Initiating system reboot.\n"); | |
f82567e5 | 285 | emergency_restart(); |
1da177e4 LT |
286 | #endif |
287 | #else | |
288 | printk(KERN_CRIT "Reset in 5ms.\n"); | |
289 | #endif | |
59338d4c | 290 | } |
01c785dc | 291 | spin_unlock(&wdt_lock); |
1da177e4 LT |
292 | return IRQ_HANDLED; |
293 | } | |
294 | ||
295 | ||
296 | /** | |
297 | * wdt_write: | |
298 | * @file: file handle to the watchdog | |
299 | * @buf: buffer to write (unused as data does not matter here | |
300 | * @count: count of bytes | |
301 | * @ppos: pointer to the position to write. No seeks allowed | |
302 | * | |
303 | * A write to a watchdog device is defined as a keepalive signal. Any | |
304 | * write of data will do, as we we don't define content meaning. | |
305 | */ | |
306 | ||
307 | static ssize_t wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
308 | { | |
309 | if(count) { | |
310 | if (!nowayout) { | |
311 | size_t i; | |
312 | ||
313 | /* In case it was set long ago */ | |
314 | expect_close = 0; | |
315 | ||
316 | for (i = 0; i != count; i++) { | |
317 | char c; | |
318 | if (get_user(c, buf + i)) | |
319 | return -EFAULT; | |
320 | if (c == 'V') | |
321 | expect_close = 42; | |
322 | } | |
323 | } | |
324 | wdt_ping(); | |
325 | } | |
326 | return count; | |
327 | } | |
328 | ||
329 | /** | |
330 | * wdt_ioctl: | |
331 | * @inode: inode of the device | |
332 | * @file: file handle to the device | |
333 | * @cmd: watchdog command | |
334 | * @arg: argument pointer | |
335 | * | |
336 | * The watchdog API defines a common set of functions for all watchdogs | |
337 | * according to their available features. We only actually usefully support | |
338 | * querying capabilities and current status. | |
339 | */ | |
340 | ||
341 | static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
342 | unsigned long arg) | |
343 | { | |
344 | void __user *argp = (void __user *)arg; | |
345 | int __user *p = argp; | |
346 | int new_heartbeat; | |
347 | int status; | |
348 | ||
349 | static struct watchdog_info ident = { | |
350 | .options = WDIOF_SETTIMEOUT| | |
351 | WDIOF_MAGICCLOSE| | |
352 | WDIOF_KEEPALIVEPING, | |
353 | .firmware_version = 1, | |
354 | .identity = "WDT500/501", | |
355 | }; | |
356 | ||
357 | /* Add options according to the card we have */ | |
358 | ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2); | |
359 | #ifdef CONFIG_WDT_501 | |
360 | ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER); | |
361 | if (tachometer) | |
362 | ident.options |= WDIOF_FANFAULT; | |
363 | #endif /* CONFIG_WDT_501 */ | |
364 | ||
365 | switch(cmd) | |
366 | { | |
367 | default: | |
795b89d2 | 368 | return -ENOTTY; |
1da177e4 LT |
369 | case WDIOC_GETSUPPORT: |
370 | return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0; | |
371 | ||
372 | case WDIOC_GETSTATUS: | |
373 | wdt_get_status(&status); | |
374 | return put_user(status, p); | |
375 | case WDIOC_GETBOOTSTATUS: | |
376 | return put_user(0, p); | |
377 | case WDIOC_KEEPALIVE: | |
378 | wdt_ping(); | |
379 | return 0; | |
380 | case WDIOC_SETTIMEOUT: | |
381 | if (get_user(new_heartbeat, p)) | |
382 | return -EFAULT; | |
383 | ||
384 | if (wdt_set_heartbeat(new_heartbeat)) | |
385 | return -EINVAL; | |
386 | ||
387 | wdt_ping(); | |
388 | /* Fall */ | |
389 | case WDIOC_GETTIMEOUT: | |
390 | return put_user(heartbeat, p); | |
391 | } | |
392 | } | |
393 | ||
394 | /** | |
395 | * wdt_open: | |
396 | * @inode: inode of device | |
397 | * @file: file handle to device | |
398 | * | |
399 | * The watchdog device has been opened. The watchdog device is single | |
400 | * open and on opening we load the counters. Counter zero is a 100Hz | |
401 | * cascade, into counter 1 which downcounts to reboot. When the counter | |
402 | * triggers counter 2 downcounts the length of the reset pulse which | |
403 | * set set to be as long as possible. | |
404 | */ | |
405 | ||
406 | static int wdt_open(struct inode *inode, struct file *file) | |
407 | { | |
408 | if(test_and_set_bit(0, &wdt_is_open)) | |
409 | return -EBUSY; | |
410 | /* | |
411 | * Activate | |
412 | */ | |
413 | wdt_start(); | |
414 | return nonseekable_open(inode, file); | |
415 | } | |
416 | ||
417 | /** | |
418 | * wdt_release: | |
419 | * @inode: inode to board | |
420 | * @file: file handle to board | |
421 | * | |
422 | * The watchdog has a configurable API. There is a religious dispute | |
423 | * between people who want their watchdog to be able to shut down and | |
424 | * those who want to be sure if the watchdog manager dies the machine | |
425 | * reboots. In the former case we disable the counters, in the latter | |
426 | * case you have to open it again very soon. | |
427 | */ | |
428 | ||
429 | static int wdt_release(struct inode *inode, struct file *file) | |
430 | { | |
431 | if (expect_close == 42) { | |
432 | wdt_stop(); | |
433 | clear_bit(0, &wdt_is_open); | |
434 | } else { | |
435 | printk(KERN_CRIT "wdt: WDT device closed unexpectedly. WDT will not stop!\n"); | |
436 | wdt_ping(); | |
437 | } | |
438 | expect_close = 0; | |
439 | return 0; | |
440 | } | |
441 | ||
442 | #ifdef CONFIG_WDT_501 | |
443 | /** | |
444 | * wdt_temp_read: | |
445 | * @file: file handle to the watchdog board | |
446 | * @buf: buffer to write 1 byte into | |
447 | * @count: length of buffer | |
448 | * @ptr: offset (no seek allowed) | |
449 | * | |
450 | * Temp_read reports the temperature in degrees Fahrenheit. The API is in | |
451 | * farenheit. It was designed by an imperial measurement luddite. | |
452 | */ | |
453 | ||
454 | static ssize_t wdt_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr) | |
455 | { | |
456 | int temperature; | |
457 | ||
458 | if (wdt_get_temperature(&temperature)) | |
459 | return -EFAULT; | |
460 | ||
461 | if (copy_to_user (buf, &temperature, 1)) | |
462 | return -EFAULT; | |
463 | ||
464 | return 1; | |
465 | } | |
466 | ||
467 | /** | |
468 | * wdt_temp_open: | |
469 | * @inode: inode of device | |
470 | * @file: file handle to device | |
471 | * | |
472 | * The temperature device has been opened. | |
473 | */ | |
474 | ||
475 | static int wdt_temp_open(struct inode *inode, struct file *file) | |
476 | { | |
477 | return nonseekable_open(inode, file); | |
478 | } | |
479 | ||
480 | /** | |
481 | * wdt_temp_release: | |
482 | * @inode: inode to board | |
483 | * @file: file handle to board | |
484 | * | |
485 | * The temperature device has been closed. | |
486 | */ | |
487 | ||
488 | static int wdt_temp_release(struct inode *inode, struct file *file) | |
489 | { | |
490 | return 0; | |
491 | } | |
492 | #endif /* CONFIG_WDT_501 */ | |
493 | ||
494 | /** | |
495 | * notify_sys: | |
496 | * @this: our notifier block | |
497 | * @code: the event being reported | |
498 | * @unused: unused | |
499 | * | |
500 | * Our notifier is called on system shutdowns. We want to turn the card | |
501 | * off at reboot otherwise the machine will reboot again during memory | |
502 | * test or worse yet during the following fsck. This would suck, in fact | |
503 | * trust me - if it happens it does suck. | |
504 | */ | |
505 | ||
506 | static int wdt_notify_sys(struct notifier_block *this, unsigned long code, | |
507 | void *unused) | |
508 | { | |
509 | if(code==SYS_DOWN || code==SYS_HALT) { | |
510 | /* Turn the card off */ | |
511 | wdt_stop(); | |
512 | } | |
513 | return NOTIFY_DONE; | |
514 | } | |
515 | ||
516 | /* | |
517 | * Kernel Interfaces | |
518 | */ | |
519 | ||
520 | ||
62322d25 | 521 | static const struct file_operations wdt_fops = { |
1da177e4 LT |
522 | .owner = THIS_MODULE, |
523 | .llseek = no_llseek, | |
524 | .write = wdt_write, | |
525 | .ioctl = wdt_ioctl, | |
526 | .open = wdt_open, | |
527 | .release = wdt_release, | |
528 | }; | |
529 | ||
530 | static struct miscdevice wdt_miscdev = { | |
531 | .minor = WATCHDOG_MINOR, | |
532 | .name = "watchdog", | |
533 | .fops = &wdt_fops, | |
534 | }; | |
535 | ||
536 | #ifdef CONFIG_WDT_501 | |
62322d25 | 537 | static const struct file_operations wdt_temp_fops = { |
1da177e4 LT |
538 | .owner = THIS_MODULE, |
539 | .llseek = no_llseek, | |
540 | .read = wdt_temp_read, | |
541 | .open = wdt_temp_open, | |
542 | .release = wdt_temp_release, | |
543 | }; | |
544 | ||
545 | static struct miscdevice temp_miscdev = { | |
546 | .minor = TEMP_MINOR, | |
547 | .name = "temperature", | |
548 | .fops = &wdt_temp_fops, | |
549 | }; | |
550 | #endif /* CONFIG_WDT_501 */ | |
551 | ||
552 | /* | |
553 | * The WDT card needs to learn about soft shutdowns in order to | |
554 | * turn the timebomb registers off. | |
555 | */ | |
556 | ||
557 | static struct notifier_block wdt_notifier = { | |
558 | .notifier_call = wdt_notify_sys, | |
559 | }; | |
560 | ||
561 | /** | |
562 | * cleanup_module: | |
563 | * | |
564 | * Unload the watchdog. You cannot do this with any file handles open. | |
565 | * If your watchdog is set to continue ticking on close and you unload | |
566 | * it, well it keeps ticking. We won't get the interrupt but the board | |
567 | * will not touch PC memory so all is fine. You just have to load a new | |
568 | * module in 60 seconds or reboot. | |
569 | */ | |
570 | ||
571 | static void __exit wdt_exit(void) | |
572 | { | |
573 | misc_deregister(&wdt_miscdev); | |
574 | #ifdef CONFIG_WDT_501 | |
575 | misc_deregister(&temp_miscdev); | |
576 | #endif /* CONFIG_WDT_501 */ | |
577 | unregister_reboot_notifier(&wdt_notifier); | |
578 | free_irq(irq, NULL); | |
579 | release_region(io,8); | |
580 | } | |
581 | ||
582 | /** | |
583 | * wdt_init: | |
584 | * | |
585 | * Set up the WDT watchdog board. All we have to do is grab the | |
586 | * resources we require and bitch if anyone beat us to them. | |
587 | * The open() function will actually kick the board off. | |
588 | */ | |
589 | ||
590 | static int __init wdt_init(void) | |
591 | { | |
592 | int ret; | |
593 | ||
594 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ | |
595 | if (wdt_set_heartbeat(heartbeat)) { | |
596 | wdt_set_heartbeat(WD_TIMO); | |
597 | printk(KERN_INFO "wdt: heartbeat value must be 0<heartbeat<65536, using %d\n", | |
598 | WD_TIMO); | |
599 | } | |
600 | ||
601 | if (!request_region(io, 8, "wdt501p")) { | |
602 | printk(KERN_ERR "wdt: I/O address 0x%04x already in use\n", io); | |
603 | ret = -EBUSY; | |
604 | goto out; | |
605 | } | |
606 | ||
0f2ed4c6 | 607 | ret = request_irq(irq, wdt_interrupt, IRQF_DISABLED, "wdt501p", NULL); |
1da177e4 LT |
608 | if(ret) { |
609 | printk(KERN_ERR "wdt: IRQ %d is not free.\n", irq); | |
610 | goto outreg; | |
611 | } | |
612 | ||
613 | ret = register_reboot_notifier(&wdt_notifier); | |
614 | if(ret) { | |
615 | printk(KERN_ERR "wdt: cannot register reboot notifier (err=%d)\n", ret); | |
616 | goto outirq; | |
617 | } | |
618 | ||
619 | #ifdef CONFIG_WDT_501 | |
620 | ret = misc_register(&temp_miscdev); | |
621 | if (ret) { | |
622 | printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n", | |
623 | TEMP_MINOR, ret); | |
624 | goto outrbt; | |
625 | } | |
626 | #endif /* CONFIG_WDT_501 */ | |
627 | ||
628 | ret = misc_register(&wdt_miscdev); | |
629 | if (ret) { | |
630 | printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n", | |
631 | WATCHDOG_MINOR, ret); | |
632 | goto outmisc; | |
633 | } | |
634 | ||
635 | ret = 0; | |
636 | printk(KERN_INFO "WDT500/501-P driver 0.10 at 0x%04x (Interrupt %d). heartbeat=%d sec (nowayout=%d)\n", | |
637 | io, irq, heartbeat, nowayout); | |
638 | #ifdef CONFIG_WDT_501 | |
639 | printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled")); | |
640 | #endif /* CONFIG_WDT_501 */ | |
641 | ||
642 | out: | |
643 | return ret; | |
644 | ||
645 | outmisc: | |
646 | #ifdef CONFIG_WDT_501 | |
647 | misc_deregister(&temp_miscdev); | |
648 | outrbt: | |
649 | #endif /* CONFIG_WDT_501 */ | |
650 | unregister_reboot_notifier(&wdt_notifier); | |
651 | outirq: | |
652 | free_irq(irq, NULL); | |
653 | outreg: | |
654 | release_region(io,8); | |
655 | goto out; | |
656 | } | |
657 | ||
658 | module_init(wdt_init); | |
659 | module_exit(wdt_exit); | |
660 | ||
661 | MODULE_AUTHOR("Alan Cox"); | |
662 | MODULE_DESCRIPTION("Driver for ISA ICS watchdog cards (WDT500/501)"); | |
663 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
664 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); | |
665 | MODULE_LICENSE("GPL"); |