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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 | |
9f2d1f0d AC |
27 | * Tim Hockin : Added insmod parameters, comment |
28 | * cleanup, parameterized timeout | |
29 | * Tigran Aivazian : Restructured wdt_init() to handle | |
30 | * failures | |
1da177e4 LT |
31 | * Joel Becker : Added WDIOC_GET/SETTIMEOUT |
32 | * Matt Domsch : Added nowayout module option | |
33 | */ | |
34 | ||
1da177e4 LT |
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> | |
9f2d1f0d AC |
46 | #include <linux/io.h> |
47 | #include <linux/uaccess.h> | |
1da177e4 | 48 | |
1da177e4 LT |
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); | |
9f2d1f0d AC |
64 | MODULE_PARM_DESC(heartbeat, |
65 | "Watchdog heartbeat in seconds. (0 < heartbeat < 65536, default=" | |
66 | __MODULE_STRING(WD_TIMO) ")"); | |
1da177e4 | 67 | |
4bfdf378 | 68 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 | 69 | module_param(nowayout, int, 0); |
9f2d1f0d AC |
70 | MODULE_PARM_DESC(nowayout, |
71 | "Watchdog cannot be stopped once started (default=" | |
72 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
1da177e4 LT |
73 | |
74 | /* You must set these - there is no sane way to probe for this board. */ | |
9f2d1f0d AC |
75 | static int io = 0x240; |
76 | static int irq = 11; | |
1da177e4 | 77 | |
01c785dc AC |
78 | static DEFINE_SPINLOCK(wdt_lock); |
79 | ||
1da177e4 LT |
80 | module_param(io, int, 0); |
81 | MODULE_PARM_DESC(io, "WDT io port (default=0x240)"); | |
82 | module_param(irq, int, 0); | |
83 | MODULE_PARM_DESC(irq, "WDT irq (default=11)"); | |
84 | ||
85 | #ifdef CONFIG_WDT_501 | |
86 | /* Support for the Fan Tachometer on the WDT501-P */ | |
87 | static int tachometer; | |
88 | ||
89 | module_param(tachometer, int, 0); | |
9f2d1f0d AC |
90 | MODULE_PARM_DESC(tachometer, |
91 | "WDT501-P Fan Tachometer support (0=disable, default=0)"); | |
1da177e4 LT |
92 | #endif /* CONFIG_WDT_501 */ |
93 | ||
94 | /* | |
95 | * Programming support | |
96 | */ | |
97 | ||
98 | static void wdt_ctr_mode(int ctr, int mode) | |
99 | { | |
9f2d1f0d AC |
100 | ctr <<= 6; |
101 | ctr |= 0x30; | |
102 | ctr |= (mode << 1); | |
1da177e4 LT |
103 | outb_p(ctr, WDT_CR); |
104 | } | |
105 | ||
106 | static void wdt_ctr_load(int ctr, int val) | |
107 | { | |
108 | outb_p(val&0xFF, WDT_COUNT0+ctr); | |
109 | outb_p(val>>8, WDT_COUNT0+ctr); | |
110 | } | |
111 | ||
112 | /** | |
113 | * wdt_start: | |
114 | * | |
115 | * Start the watchdog driver. | |
116 | */ | |
117 | ||
118 | static int wdt_start(void) | |
119 | { | |
01c785dc AC |
120 | unsigned long flags; |
121 | spin_lock_irqsave(&wdt_lock, flags); | |
1da177e4 | 122 | inb_p(WDT_DC); /* Disable watchdog */ |
9f2d1f0d AC |
123 | wdt_ctr_mode(0, 3); /* Program CTR0 for Mode 3: |
124 | Square Wave Generator */ | |
125 | wdt_ctr_mode(1, 2); /* Program CTR1 for Mode 2: | |
126 | Rate Generator */ | |
127 | wdt_ctr_mode(2, 0); /* Program CTR2 for Mode 0: | |
128 | Pulse on Terminal Count */ | |
1da177e4 | 129 | wdt_ctr_load(0, 8948); /* Count at 100Hz */ |
9f2d1f0d AC |
130 | wdt_ctr_load(1, wd_heartbeat); /* Heartbeat */ |
131 | wdt_ctr_load(2, 65535); /* Length of reset pulse */ | |
1da177e4 | 132 | outb_p(0, WDT_DC); /* Enable watchdog */ |
01c785dc | 133 | spin_unlock_irqrestore(&wdt_lock, flags); |
1da177e4 LT |
134 | return 0; |
135 | } | |
136 | ||
137 | /** | |
138 | * wdt_stop: | |
139 | * | |
140 | * Stop the watchdog driver. | |
141 | */ | |
142 | ||
9f2d1f0d | 143 | static int wdt_stop(void) |
1da177e4 | 144 | { |
01c785dc AC |
145 | unsigned long flags; |
146 | spin_lock_irqsave(&wdt_lock, flags); | |
1da177e4 LT |
147 | /* Turn the card off */ |
148 | inb_p(WDT_DC); /* Disable watchdog */ | |
9f2d1f0d | 149 | wdt_ctr_load(2, 0); /* 0 length reset pulses now */ |
01c785dc | 150 | spin_unlock_irqrestore(&wdt_lock, flags); |
1da177e4 LT |
151 | return 0; |
152 | } | |
153 | ||
154 | /** | |
155 | * wdt_ping: | |
156 | * | |
9f2d1f0d AC |
157 | * Reload counter one with the watchdog heartbeat. We don't bother |
158 | * reloading the cascade counter. | |
1da177e4 LT |
159 | */ |
160 | ||
161 | static int wdt_ping(void) | |
162 | { | |
01c785dc AC |
163 | unsigned long flags; |
164 | spin_lock_irqsave(&wdt_lock, flags); | |
1da177e4 LT |
165 | /* Write a watchdog value */ |
166 | inb_p(WDT_DC); /* Disable watchdog */ | |
9f2d1f0d AC |
167 | wdt_ctr_mode(1, 2); /* Re-Program CTR1 for Mode 2: |
168 | Rate Generator */ | |
169 | wdt_ctr_load(1, wd_heartbeat); /* Heartbeat */ | |
1da177e4 | 170 | outb_p(0, WDT_DC); /* Enable watchdog */ |
01c785dc | 171 | spin_unlock_irqrestore(&wdt_lock, flags); |
1da177e4 LT |
172 | return 0; |
173 | } | |
174 | ||
175 | /** | |
176 | * wdt_set_heartbeat: | |
177 | * @t: the new heartbeat value that needs to be set. | |
178 | * | |
9f2d1f0d AC |
179 | * Set a new heartbeat value for the watchdog device. If the heartbeat |
180 | * value is incorrect we keep the old value and return -EINVAL. If | |
181 | * successful we return 0. | |
1da177e4 | 182 | */ |
9f2d1f0d | 183 | |
1da177e4 LT |
184 | static int wdt_set_heartbeat(int t) |
185 | { | |
9f2d1f0d | 186 | if (t < 1 || t > 65535) |
1da177e4 LT |
187 | return -EINVAL; |
188 | ||
189 | heartbeat = t; | |
190 | wd_heartbeat = t * 100; | |
191 | return 0; | |
192 | } | |
193 | ||
194 | /** | |
195 | * wdt_get_status: | |
196 | * @status: the new status. | |
197 | * | |
198 | * Extract the status information from a WDT watchdog device. There are | |
199 | * several board variants so we have to know which bits are valid. Some | |
200 | * bits default to one and some to zero in order to be maximally painful. | |
201 | * | |
202 | * we then map the bits onto the status ioctl flags. | |
203 | */ | |
204 | ||
205 | static int wdt_get_status(int *status) | |
206 | { | |
01c785dc AC |
207 | unsigned char new_status; |
208 | unsigned long flags; | |
209 | ||
210 | spin_lock_irqsave(&wdt_lock, flags); | |
211 | new_status = inb_p(WDT_SR); | |
212 | spin_unlock_irqrestore(&wdt_lock, flags); | |
1da177e4 | 213 | |
9f2d1f0d | 214 | *status = 0; |
1da177e4 LT |
215 | if (new_status & WDC_SR_ISOI0) |
216 | *status |= WDIOF_EXTERN1; | |
217 | if (new_status & WDC_SR_ISII1) | |
218 | *status |= WDIOF_EXTERN2; | |
219 | #ifdef CONFIG_WDT_501 | |
220 | if (!(new_status & WDC_SR_TGOOD)) | |
221 | *status |= WDIOF_OVERHEAT; | |
222 | if (!(new_status & WDC_SR_PSUOVER)) | |
223 | *status |= WDIOF_POWEROVER; | |
224 | if (!(new_status & WDC_SR_PSUUNDR)) | |
225 | *status |= WDIOF_POWERUNDER; | |
226 | if (tachometer) { | |
227 | if (!(new_status & WDC_SR_FANGOOD)) | |
228 | *status |= WDIOF_FANFAULT; | |
229 | } | |
230 | #endif /* CONFIG_WDT_501 */ | |
231 | return 0; | |
232 | } | |
233 | ||
234 | #ifdef CONFIG_WDT_501 | |
235 | /** | |
236 | * wdt_get_temperature: | |
237 | * | |
238 | * Reports the temperature in degrees Fahrenheit. The API is in | |
239 | * farenheit. It was designed by an imperial measurement luddite. | |
240 | */ | |
241 | ||
242 | static int wdt_get_temperature(int *temperature) | |
243 | { | |
01c785dc AC |
244 | unsigned short c; |
245 | unsigned long flags; | |
1da177e4 | 246 | |
01c785dc AC |
247 | spin_lock_irqsave(&wdt_lock, flags); |
248 | c = inb_p(WDT_RT); | |
249 | spin_unlock_irqrestore(&wdt_lock, flags); | |
1da177e4 LT |
250 | *temperature = (c * 11 / 15) + 7; |
251 | return 0; | |
252 | } | |
253 | #endif /* CONFIG_WDT_501 */ | |
254 | ||
255 | /** | |
256 | * wdt_interrupt: | |
257 | * @irq: Interrupt number | |
258 | * @dev_id: Unused as we don't allow multiple devices. | |
1da177e4 LT |
259 | * |
260 | * Handle an interrupt from the board. These are raised when the status | |
261 | * map changes in what the board considers an interesting way. That means | |
262 | * a failure condition occurring. | |
263 | */ | |
264 | ||
7d12e780 | 265 | static irqreturn_t wdt_interrupt(int irq, void *dev_id) |
1da177e4 LT |
266 | { |
267 | /* | |
268 | * Read the status register see what is up and | |
269 | * then printk it. | |
270 | */ | |
01c785dc AC |
271 | unsigned char status; |
272 | ||
273 | spin_lock(&wdt_lock); | |
274 | status = inb_p(WDT_SR); | |
1da177e4 LT |
275 | |
276 | printk(KERN_CRIT "WDT status %d\n", status); | |
277 | ||
278 | #ifdef CONFIG_WDT_501 | |
279 | if (!(status & WDC_SR_TGOOD)) | |
9f2d1f0d | 280 | printk(KERN_CRIT "Overheat alarm.(%d)\n", inb_p(WDT_RT)); |
1da177e4 LT |
281 | if (!(status & WDC_SR_PSUOVER)) |
282 | printk(KERN_CRIT "PSU over voltage.\n"); | |
283 | if (!(status & WDC_SR_PSUUNDR)) | |
284 | printk(KERN_CRIT "PSU under voltage.\n"); | |
285 | if (tachometer) { | |
286 | if (!(status & WDC_SR_FANGOOD)) | |
287 | printk(KERN_CRIT "Possible fan fault.\n"); | |
288 | } | |
289 | #endif /* CONFIG_WDT_501 */ | |
59338d4c | 290 | if (!(status & WDC_SR_WCCR)) { |
1da177e4 LT |
291 | #ifdef SOFTWARE_REBOOT |
292 | #ifdef ONLY_TESTING | |
293 | printk(KERN_CRIT "Would Reboot.\n"); | |
294 | #else | |
295 | printk(KERN_CRIT "Initiating system reboot.\n"); | |
f82567e5 | 296 | emergency_restart(); |
1da177e4 LT |
297 | #endif |
298 | #else | |
299 | printk(KERN_CRIT "Reset in 5ms.\n"); | |
300 | #endif | |
59338d4c | 301 | } |
01c785dc | 302 | spin_unlock(&wdt_lock); |
1da177e4 LT |
303 | return IRQ_HANDLED; |
304 | } | |
305 | ||
306 | ||
307 | /** | |
308 | * wdt_write: | |
309 | * @file: file handle to the watchdog | |
310 | * @buf: buffer to write (unused as data does not matter here | |
311 | * @count: count of bytes | |
312 | * @ppos: pointer to the position to write. No seeks allowed | |
313 | * | |
314 | * A write to a watchdog device is defined as a keepalive signal. Any | |
315 | * write of data will do, as we we don't define content meaning. | |
316 | */ | |
317 | ||
9f2d1f0d AC |
318 | static ssize_t wdt_write(struct file *file, const char __user *buf, |
319 | size_t count, loff_t *ppos) | |
1da177e4 | 320 | { |
9f2d1f0d | 321 | if (count) { |
1da177e4 LT |
322 | if (!nowayout) { |
323 | size_t i; | |
324 | ||
325 | /* In case it was set long ago */ | |
326 | expect_close = 0; | |
327 | ||
328 | for (i = 0; i != count; i++) { | |
329 | char c; | |
330 | if (get_user(c, buf + i)) | |
331 | return -EFAULT; | |
332 | if (c == 'V') | |
333 | expect_close = 42; | |
334 | } | |
335 | } | |
336 | wdt_ping(); | |
337 | } | |
338 | return count; | |
339 | } | |
340 | ||
341 | /** | |
342 | * wdt_ioctl: | |
1da177e4 LT |
343 | * @file: file handle to the device |
344 | * @cmd: watchdog command | |
345 | * @arg: argument pointer | |
346 | * | |
347 | * The watchdog API defines a common set of functions for all watchdogs | |
348 | * according to their available features. We only actually usefully support | |
349 | * querying capabilities and current status. | |
350 | */ | |
351 | ||
9f2d1f0d | 352 | static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
353 | { |
354 | void __user *argp = (void __user *)arg; | |
355 | int __user *p = argp; | |
356 | int new_heartbeat; | |
357 | int status; | |
358 | ||
359 | static struct watchdog_info ident = { | |
360 | .options = WDIOF_SETTIMEOUT| | |
361 | WDIOF_MAGICCLOSE| | |
362 | WDIOF_KEEPALIVEPING, | |
363 | .firmware_version = 1, | |
364 | .identity = "WDT500/501", | |
365 | }; | |
366 | ||
367 | /* Add options according to the card we have */ | |
368 | ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2); | |
369 | #ifdef CONFIG_WDT_501 | |
370 | ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER); | |
371 | if (tachometer) | |
372 | ident.options |= WDIOF_FANFAULT; | |
373 | #endif /* CONFIG_WDT_501 */ | |
374 | ||
9f2d1f0d AC |
375 | switch (cmd) { |
376 | default: | |
377 | return -ENOTTY; | |
378 | case WDIOC_GETSUPPORT: | |
379 | return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; | |
380 | case WDIOC_GETSTATUS: | |
381 | wdt_get_status(&status); | |
382 | return put_user(status, p); | |
383 | case WDIOC_GETBOOTSTATUS: | |
384 | return put_user(0, p); | |
385 | case WDIOC_KEEPALIVE: | |
386 | wdt_ping(); | |
387 | return 0; | |
388 | case WDIOC_SETTIMEOUT: | |
389 | if (get_user(new_heartbeat, p)) | |
390 | return -EFAULT; | |
391 | if (wdt_set_heartbeat(new_heartbeat)) | |
392 | return -EINVAL; | |
393 | wdt_ping(); | |
394 | /* Fall */ | |
395 | case WDIOC_GETTIMEOUT: | |
396 | return put_user(heartbeat, p); | |
1da177e4 LT |
397 | } |
398 | } | |
399 | ||
400 | /** | |
401 | * wdt_open: | |
402 | * @inode: inode of device | |
403 | * @file: file handle to device | |
404 | * | |
405 | * The watchdog device has been opened. The watchdog device is single | |
406 | * open and on opening we load the counters. Counter zero is a 100Hz | |
407 | * cascade, into counter 1 which downcounts to reboot. When the counter | |
408 | * triggers counter 2 downcounts the length of the reset pulse which | |
409 | * set set to be as long as possible. | |
410 | */ | |
411 | ||
412 | static int wdt_open(struct inode *inode, struct file *file) | |
413 | { | |
9f2d1f0d | 414 | if (test_and_set_bit(0, &wdt_is_open)) |
1da177e4 LT |
415 | return -EBUSY; |
416 | /* | |
417 | * Activate | |
418 | */ | |
419 | wdt_start(); | |
420 | return nonseekable_open(inode, file); | |
421 | } | |
422 | ||
423 | /** | |
424 | * wdt_release: | |
425 | * @inode: inode to board | |
426 | * @file: file handle to board | |
427 | * | |
428 | * The watchdog has a configurable API. There is a religious dispute | |
429 | * between people who want their watchdog to be able to shut down and | |
430 | * those who want to be sure if the watchdog manager dies the machine | |
431 | * reboots. In the former case we disable the counters, in the latter | |
432 | * case you have to open it again very soon. | |
433 | */ | |
434 | ||
435 | static int wdt_release(struct inode *inode, struct file *file) | |
436 | { | |
437 | if (expect_close == 42) { | |
438 | wdt_stop(); | |
439 | clear_bit(0, &wdt_is_open); | |
440 | } else { | |
9f2d1f0d AC |
441 | printk(KERN_CRIT |
442 | "wdt: WDT device closed unexpectedly. WDT will not stop!\n"); | |
1da177e4 LT |
443 | wdt_ping(); |
444 | } | |
445 | expect_close = 0; | |
446 | return 0; | |
447 | } | |
448 | ||
449 | #ifdef CONFIG_WDT_501 | |
450 | /** | |
451 | * wdt_temp_read: | |
452 | * @file: file handle to the watchdog board | |
453 | * @buf: buffer to write 1 byte into | |
454 | * @count: length of buffer | |
455 | * @ptr: offset (no seek allowed) | |
456 | * | |
457 | * Temp_read reports the temperature in degrees Fahrenheit. The API is in | |
458 | * farenheit. It was designed by an imperial measurement luddite. | |
459 | */ | |
460 | ||
9f2d1f0d AC |
461 | static ssize_t wdt_temp_read(struct file *file, char __user *buf, |
462 | size_t count, loff_t *ptr) | |
1da177e4 LT |
463 | { |
464 | int temperature; | |
465 | ||
466 | if (wdt_get_temperature(&temperature)) | |
467 | return -EFAULT; | |
468 | ||
9f2d1f0d | 469 | if (copy_to_user(buf, &temperature, 1)) |
1da177e4 LT |
470 | return -EFAULT; |
471 | ||
472 | return 1; | |
473 | } | |
474 | ||
475 | /** | |
476 | * wdt_temp_open: | |
477 | * @inode: inode of device | |
478 | * @file: file handle to device | |
479 | * | |
480 | * The temperature device has been opened. | |
481 | */ | |
482 | ||
483 | static int wdt_temp_open(struct inode *inode, struct file *file) | |
484 | { | |
485 | return nonseekable_open(inode, file); | |
486 | } | |
487 | ||
488 | /** | |
489 | * wdt_temp_release: | |
490 | * @inode: inode to board | |
491 | * @file: file handle to board | |
492 | * | |
493 | * The temperature device has been closed. | |
494 | */ | |
495 | ||
496 | static int wdt_temp_release(struct inode *inode, struct file *file) | |
497 | { | |
498 | return 0; | |
499 | } | |
500 | #endif /* CONFIG_WDT_501 */ | |
501 | ||
502 | /** | |
503 | * notify_sys: | |
504 | * @this: our notifier block | |
505 | * @code: the event being reported | |
506 | * @unused: unused | |
507 | * | |
508 | * Our notifier is called on system shutdowns. We want to turn the card | |
509 | * off at reboot otherwise the machine will reboot again during memory | |
510 | * test or worse yet during the following fsck. This would suck, in fact | |
511 | * trust me - if it happens it does suck. | |
512 | */ | |
513 | ||
514 | static int wdt_notify_sys(struct notifier_block *this, unsigned long code, | |
515 | void *unused) | |
516 | { | |
9f2d1f0d | 517 | if (code == SYS_DOWN || code == SYS_HALT) |
1da177e4 | 518 | wdt_stop(); |
1da177e4 LT |
519 | return NOTIFY_DONE; |
520 | } | |
521 | ||
522 | /* | |
523 | * Kernel Interfaces | |
524 | */ | |
525 | ||
526 | ||
62322d25 | 527 | static const struct file_operations wdt_fops = { |
1da177e4 LT |
528 | .owner = THIS_MODULE, |
529 | .llseek = no_llseek, | |
530 | .write = wdt_write, | |
9f2d1f0d | 531 | .unlocked_ioctl = wdt_ioctl, |
1da177e4 LT |
532 | .open = wdt_open, |
533 | .release = wdt_release, | |
534 | }; | |
535 | ||
536 | static struct miscdevice wdt_miscdev = { | |
537 | .minor = WATCHDOG_MINOR, | |
538 | .name = "watchdog", | |
539 | .fops = &wdt_fops, | |
540 | }; | |
541 | ||
542 | #ifdef CONFIG_WDT_501 | |
62322d25 | 543 | static const struct file_operations wdt_temp_fops = { |
1da177e4 LT |
544 | .owner = THIS_MODULE, |
545 | .llseek = no_llseek, | |
546 | .read = wdt_temp_read, | |
547 | .open = wdt_temp_open, | |
548 | .release = wdt_temp_release, | |
549 | }; | |
550 | ||
551 | static struct miscdevice temp_miscdev = { | |
552 | .minor = TEMP_MINOR, | |
553 | .name = "temperature", | |
554 | .fops = &wdt_temp_fops, | |
555 | }; | |
556 | #endif /* CONFIG_WDT_501 */ | |
557 | ||
558 | /* | |
559 | * The WDT card needs to learn about soft shutdowns in order to | |
560 | * turn the timebomb registers off. | |
561 | */ | |
562 | ||
563 | static struct notifier_block wdt_notifier = { | |
564 | .notifier_call = wdt_notify_sys, | |
565 | }; | |
566 | ||
567 | /** | |
568 | * cleanup_module: | |
569 | * | |
570 | * Unload the watchdog. You cannot do this with any file handles open. | |
571 | * If your watchdog is set to continue ticking on close and you unload | |
572 | * it, well it keeps ticking. We won't get the interrupt but the board | |
573 | * will not touch PC memory so all is fine. You just have to load a new | |
574 | * module in 60 seconds or reboot. | |
575 | */ | |
576 | ||
577 | static void __exit wdt_exit(void) | |
578 | { | |
579 | misc_deregister(&wdt_miscdev); | |
580 | #ifdef CONFIG_WDT_501 | |
581 | misc_deregister(&temp_miscdev); | |
582 | #endif /* CONFIG_WDT_501 */ | |
583 | unregister_reboot_notifier(&wdt_notifier); | |
584 | free_irq(irq, NULL); | |
9f2d1f0d | 585 | release_region(io, 8); |
1da177e4 LT |
586 | } |
587 | ||
588 | /** | |
589 | * wdt_init: | |
590 | * | |
591 | * Set up the WDT watchdog board. All we have to do is grab the | |
592 | * resources we require and bitch if anyone beat us to them. | |
593 | * The open() function will actually kick the board off. | |
594 | */ | |
595 | ||
596 | static int __init wdt_init(void) | |
597 | { | |
598 | int ret; | |
599 | ||
9f2d1f0d AC |
600 | /* Check that the heartbeat value is within it's range; |
601 | if not reset to the default */ | |
1da177e4 LT |
602 | if (wdt_set_heartbeat(heartbeat)) { |
603 | wdt_set_heartbeat(WD_TIMO); | |
9f2d1f0d | 604 | printk(KERN_INFO "wdt: heartbeat value must be 0 < heartbeat < 65536, using %d\n", |
1da177e4 LT |
605 | WD_TIMO); |
606 | } | |
607 | ||
608 | if (!request_region(io, 8, "wdt501p")) { | |
9f2d1f0d AC |
609 | printk(KERN_ERR |
610 | "wdt: I/O address 0x%04x already in use\n", io); | |
1da177e4 LT |
611 | ret = -EBUSY; |
612 | goto out; | |
613 | } | |
614 | ||
0f2ed4c6 | 615 | ret = request_irq(irq, wdt_interrupt, IRQF_DISABLED, "wdt501p", NULL); |
9f2d1f0d | 616 | if (ret) { |
1da177e4 LT |
617 | printk(KERN_ERR "wdt: IRQ %d is not free.\n", irq); |
618 | goto outreg; | |
619 | } | |
620 | ||
621 | ret = register_reboot_notifier(&wdt_notifier); | |
9f2d1f0d AC |
622 | if (ret) { |
623 | printk(KERN_ERR | |
624 | "wdt: cannot register reboot notifier (err=%d)\n", ret); | |
1da177e4 LT |
625 | goto outirq; |
626 | } | |
627 | ||
628 | #ifdef CONFIG_WDT_501 | |
629 | ret = misc_register(&temp_miscdev); | |
630 | if (ret) { | |
9f2d1f0d AC |
631 | printk(KERN_ERR |
632 | "wdt: cannot register miscdev on minor=%d (err=%d)\n", | |
633 | TEMP_MINOR, ret); | |
1da177e4 LT |
634 | goto outrbt; |
635 | } | |
636 | #endif /* CONFIG_WDT_501 */ | |
637 | ||
638 | ret = misc_register(&wdt_miscdev); | |
639 | if (ret) { | |
9f2d1f0d AC |
640 | printk(KERN_ERR |
641 | "wdt: cannot register miscdev on minor=%d (err=%d)\n", | |
642 | WATCHDOG_MINOR, ret); | |
1da177e4 LT |
643 | goto outmisc; |
644 | } | |
645 | ||
646 | ret = 0; | |
647 | printk(KERN_INFO "WDT500/501-P driver 0.10 at 0x%04x (Interrupt %d). heartbeat=%d sec (nowayout=%d)\n", | |
648 | io, irq, heartbeat, nowayout); | |
649 | #ifdef CONFIG_WDT_501 | |
9f2d1f0d AC |
650 | printk(KERN_INFO "wdt: Fan Tachometer is %s\n", |
651 | (tachometer ? "Enabled" : "Disabled")); | |
1da177e4 LT |
652 | #endif /* CONFIG_WDT_501 */ |
653 | ||
654 | out: | |
655 | return ret; | |
656 | ||
657 | outmisc: | |
658 | #ifdef CONFIG_WDT_501 | |
659 | misc_deregister(&temp_miscdev); | |
660 | outrbt: | |
661 | #endif /* CONFIG_WDT_501 */ | |
662 | unregister_reboot_notifier(&wdt_notifier); | |
663 | outirq: | |
664 | free_irq(irq, NULL); | |
665 | outreg: | |
9f2d1f0d | 666 | release_region(io, 8); |
1da177e4 LT |
667 | goto out; |
668 | } | |
669 | ||
670 | module_init(wdt_init); | |
671 | module_exit(wdt_exit); | |
672 | ||
673 | MODULE_AUTHOR("Alan Cox"); | |
674 | MODULE_DESCRIPTION("Driver for ISA ICS watchdog cards (WDT500/501)"); | |
675 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
676 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); | |
677 | MODULE_LICENSE("GPL"); |