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Marcus Junkerf9a8c892006-08-24 17:11:50 +02001/*
Samuel Tardieude710d62006-09-07 11:57:00 +02002 * w83697hf/hg WDT driver
Marcus Junkerf9a8c892006-08-24 17:11:50 +02003 *
Samuel Tardieu3fdee8d2006-09-07 11:57:00 +02004 * (c) Copyright 2006 Samuel Tardieu <sam@rfc1149.net>
Marcus Junkerf9a8c892006-08-24 17:11:50 +02005 * (c) Copyright 2006 Marcus Junker <junker@anduras.de>
6 *
Samuel Tardieude710d62006-09-07 11:57:00 +02007 * Based on w83627hf_wdt.c which is based on advantechwdt.c
8 * which is based on wdt.c.
Marcus Junkerf9a8c892006-08-24 17:11:50 +02009 * Original copyright messages:
10 *
Jan Engelhardt96de0e22007-10-19 23:21:04 +020011 * (c) Copyright 2003 Pádraig Brady <P@draigBrady.com>
Marcus Junkerf9a8c892006-08-24 17:11:50 +020012 *
13 * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
14 *
Alan Cox29fa0582008-10-27 15:17:56 +000015 * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
16 * All Rights Reserved.
Marcus Junkerf9a8c892006-08-24 17:11:50 +020017 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 *
23 * Neither Marcus Junker nor ANDURAS AG admit liability nor provide
24 * warranty for any of this software. This material is provided
25 * "AS-IS" and at no charge.
26 */
27
28#include <linux/module.h>
29#include <linux/moduleparam.h>
30#include <linux/types.h>
31#include <linux/miscdevice.h>
32#include <linux/watchdog.h>
33#include <linux/fs.h>
34#include <linux/ioport.h>
35#include <linux/notifier.h>
36#include <linux/reboot.h>
37#include <linux/init.h>
Wim Van Sebroeckab9d4412006-09-02 18:50:20 +020038#include <linux/spinlock.h>
Alan Coxc1c8dd32008-05-19 14:09:23 +010039#include <linux/io.h>
40#include <linux/uaccess.h>
Marcus Junkerf9a8c892006-08-24 17:11:50 +020041
Marcus Junkerf9a8c892006-08-24 17:11:50 +020042#include <asm/system.h>
43
Samuel Tardieude710d62006-09-07 11:57:00 +020044#define WATCHDOG_NAME "w83697hf/hg WDT"
Marcus Junkerf9a8c892006-08-24 17:11:50 +020045#define PFX WATCHDOG_NAME ": "
46#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
Samuel Tardieu6fd65602008-03-12 14:28:03 +010047#define WATCHDOG_EARLY_DISABLE 1 /* Disable until userland kicks in */
Marcus Junkerf9a8c892006-08-24 17:11:50 +020048
49static unsigned long wdt_is_open;
50static char expect_close;
Alexey Dobriyanc7dfd0c2007-11-01 16:27:08 -070051static DEFINE_SPINLOCK(io_lock);
Marcus Junkerf9a8c892006-08-24 17:11:50 +020052
53/* You must set this - there is no sane way to probe for this board. */
Samuel Tardieuc81b2992006-09-07 11:57:00 +020054static int wdt_io = 0x2e;
Marcus Junkerf9a8c892006-08-24 17:11:50 +020055module_param(wdt_io, int, 0);
Alan Coxc1c8dd32008-05-19 14:09:23 +010056MODULE_PARM_DESC(wdt_io,
57 "w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)");
Marcus Junkerf9a8c892006-08-24 17:11:50 +020058
59static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
60module_param(timeout, int, 0);
Alan Coxc1c8dd32008-05-19 14:09:23 +010061MODULE_PARM_DESC(timeout,
62 "Watchdog timeout in seconds. 1<= timeout <=255 (default="
63 __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
Marcus Junkerf9a8c892006-08-24 17:11:50 +020064
65static int nowayout = WATCHDOG_NOWAYOUT;
66module_param(nowayout, int, 0);
Alan Coxc1c8dd32008-05-19 14:09:23 +010067MODULE_PARM_DESC(nowayout,
68 "Watchdog cannot be stopped once started (default="
69 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
Marcus Junkerf9a8c892006-08-24 17:11:50 +020070
Samuel Tardieu6fd65602008-03-12 14:28:03 +010071static int early_disable = WATCHDOG_EARLY_DISABLE;
72module_param(early_disable, int, 0);
Alan Coxc1c8dd32008-05-19 14:09:23 +010073MODULE_PARM_DESC(early_disable,
74 "Watchdog gets disabled at boot time (default="
75 __MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")");
Samuel Tardieu6fd65602008-03-12 14:28:03 +010076
Marcus Junkerf9a8c892006-08-24 17:11:50 +020077/*
78 * Kernel methods.
79 */
80
Alan Coxc1c8dd32008-05-19 14:09:23 +010081#define W83697HF_EFER (wdt_io + 0) /* Extended Function Enable Register */
82#define W83697HF_EFIR (wdt_io + 0) /* Extended Function Index Register
83 (same as EFER) */
84#define W83697HF_EFDR (wdt_io + 1) /* Extended Function Data Register */
Marcus Junkerf9a8c892006-08-24 17:11:50 +020085
Alan Coxc1c8dd32008-05-19 14:09:23 +010086static inline void w83697hf_unlock(void)
Marcus Junkerf9a8c892006-08-24 17:11:50 +020087{
Samuel Tardieu44d7d322006-09-07 11:57:00 +020088 outb_p(0x87, W83697HF_EFER); /* Enter extended function mode */
89 outb_p(0x87, W83697HF_EFER); /* Again according to manual */
Samuel Tardieuf7be3322006-09-07 11:57:00 +020090}
91
Alan Coxc1c8dd32008-05-19 14:09:23 +010092static inline void w83697hf_lock(void)
Samuel Tardieufe851eb2006-09-07 11:57:00 +020093{
94 outb_p(0xAA, W83697HF_EFER); /* Leave extended function mode */
95}
96
Samuel Tardieu0cd54472006-09-07 11:57:00 +020097/*
Samuel Tardieud46ab592006-09-07 11:57:00 +020098 * The three functions w83697hf_get_reg(), w83697hf_set_reg() and
99 * w83697hf_write_timeout() must be called with the device unlocked.
Samuel Tardieu0cd54472006-09-07 11:57:00 +0200100 */
101
Alan Coxc1c8dd32008-05-19 14:09:23 +0100102static unsigned char w83697hf_get_reg(unsigned char reg)
Samuel Tardieu0cd54472006-09-07 11:57:00 +0200103{
104 outb_p(reg, W83697HF_EFIR);
105 return inb_p(W83697HF_EFDR);
106}
107
Alan Coxc1c8dd32008-05-19 14:09:23 +0100108static void w83697hf_set_reg(unsigned char reg, unsigned char data)
Samuel Tardieu0cd54472006-09-07 11:57:00 +0200109{
110 outb_p(reg, W83697HF_EFIR);
111 outb_p(data, W83697HF_EFDR);
112}
113
Alan Coxc1c8dd32008-05-19 14:09:23 +0100114static void w83697hf_write_timeout(int timeout)
Samuel Tardieud46ab592006-09-07 11:57:00 +0200115{
Alan Coxc1c8dd32008-05-19 14:09:23 +0100116 /* Write Timeout counter to CRF4 */
117 w83697hf_set_reg(0xF4, timeout);
Samuel Tardieud46ab592006-09-07 11:57:00 +0200118}
119
Alan Coxc1c8dd32008-05-19 14:09:23 +0100120static void w83697hf_select_wdt(void)
Samuel Tardieua7933e02006-09-07 11:57:00 +0200121{
122 w83697hf_unlock();
123 w83697hf_set_reg(0x07, 0x08); /* Switch to logic device 8 (GPIO2) */
124}
125
Alan Coxc1c8dd32008-05-19 14:09:23 +0100126static inline void w83697hf_deselect_wdt(void)
Samuel Tardieua7933e02006-09-07 11:57:00 +0200127{
128 w83697hf_lock();
129}
130
Alan Coxc1c8dd32008-05-19 14:09:23 +0100131static void w83697hf_init(void)
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200132{
Samuel Tardieub7b98682006-09-07 11:57:00 +0200133 unsigned char bbuf;
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200134
Samuel Tardieufa69afd2006-09-07 11:57:00 +0200135 w83697hf_select_wdt();
136
Samuel Tardieub7b98682006-09-07 11:57:00 +0200137 bbuf = w83697hf_get_reg(0x29);
138 bbuf &= ~0x60;
139 bbuf |= 0x20;
Alan Coxc1c8dd32008-05-19 14:09:23 +0100140
141 /* Set pin 119 to WDTO# mode (= CR29, WDT0) */
142 w83697hf_set_reg(0x29, bbuf);
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200143
Samuel Tardieub7b98682006-09-07 11:57:00 +0200144 bbuf = w83697hf_get_reg(0xF3);
145 bbuf &= ~0x04;
146 w83697hf_set_reg(0xF3, bbuf); /* Count mode is seconds */
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200147
Samuel Tardieufa69afd2006-09-07 11:57:00 +0200148 w83697hf_deselect_wdt();
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200149}
150
Alan Coxc1c8dd32008-05-19 14:09:23 +0100151static void wdt_ping(void)
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200152{
Wim Van Sebroeckab9d4412006-09-02 18:50:20 +0200153 spin_lock(&io_lock);
Samuel Tardieua7933e02006-09-07 11:57:00 +0200154 w83697hf_select_wdt();
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200155
Samuel Tardieud46ab592006-09-07 11:57:00 +0200156 w83697hf_write_timeout(timeout);
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200157
Samuel Tardieua7933e02006-09-07 11:57:00 +0200158 w83697hf_deselect_wdt();
Wim Van Sebroeckab9d4412006-09-02 18:50:20 +0200159 spin_unlock(&io_lock);
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200160}
161
Alan Coxc1c8dd32008-05-19 14:09:23 +0100162static void wdt_enable(void)
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200163{
Samuel Tardieu089d8132006-09-07 11:57:00 +0200164 spin_lock(&io_lock);
165 w83697hf_select_wdt();
166
167 w83697hf_write_timeout(timeout);
168 w83697hf_set_reg(0x30, 1); /* Enable timer */
169
170 w83697hf_deselect_wdt();
171 spin_unlock(&io_lock);
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200172}
173
Alan Coxc1c8dd32008-05-19 14:09:23 +0100174static void wdt_disable(void)
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200175{
Samuel Tardieu089d8132006-09-07 11:57:00 +0200176 spin_lock(&io_lock);
177 w83697hf_select_wdt();
178
179 w83697hf_set_reg(0x30, 0); /* Disable timer */
180 w83697hf_write_timeout(0);
181
182 w83697hf_deselect_wdt();
183 spin_unlock(&io_lock);
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200184}
185
Alan Coxc1c8dd32008-05-19 14:09:23 +0100186static unsigned char wdt_running(void)
Samuel Tardieu6fd65602008-03-12 14:28:03 +0100187{
188 unsigned char t;
189
190 spin_lock(&io_lock);
191 w83697hf_select_wdt();
192
193 t = w83697hf_get_reg(0xF4); /* Read timer */
194
195 w83697hf_deselect_wdt();
196 spin_unlock(&io_lock);
197
198 return t;
199}
200
Alan Coxc1c8dd32008-05-19 14:09:23 +0100201static int wdt_set_heartbeat(int t)
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200202{
Alan Coxc1c8dd32008-05-19 14:09:23 +0100203 if (t < 1 || t > 255)
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200204 return -EINVAL;
205
206 timeout = t;
207 return 0;
208}
209
Alan Coxc1c8dd32008-05-19 14:09:23 +0100210static ssize_t wdt_write(struct file *file, const char __user *buf,
211 size_t count, loff_t *ppos)
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200212{
213 if (count) {
214 if (!nowayout) {
215 size_t i;
216
217 expect_close = 0;
218
219 for (i = 0; i != count; i++) {
220 char c;
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000221 if (get_user(c, buf + i))
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200222 return -EFAULT;
223 if (c == 'V')
224 expect_close = 42;
225 }
226 }
227 wdt_ping();
228 }
229 return count;
230}
231
Alan Coxc1c8dd32008-05-19 14:09:23 +0100232static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200233{
234 void __user *argp = (void __user *)arg;
235 int __user *p = argp;
236 int new_timeout;
Alan Coxc1c8dd32008-05-19 14:09:23 +0100237 static const struct watchdog_info ident = {
238 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
239 | WDIOF_MAGICCLOSE,
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200240 .firmware_version = 1,
241 .identity = "W83697HF WDT",
242 };
243
244 switch (cmd) {
245 case WDIOC_GETSUPPORT:
Samuel Tardieudb165252006-09-07 11:57:00 +0200246 if (copy_to_user(argp, &ident, sizeof(ident)))
247 return -EFAULT;
248 break;
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200249
250 case WDIOC_GETSTATUS:
251 case WDIOC_GETBOOTSTATUS:
Samuel Tardieudb165252006-09-07 11:57:00 +0200252 return put_user(0, p);
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200253
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200254 case WDIOC_SETOPTIONS:
255 {
Samuel Tardieudb165252006-09-07 11:57:00 +0200256 int options, retval = -EINVAL;
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200257
Samuel Tardieudb165252006-09-07 11:57:00 +0200258 if (get_user(options, p))
259 return -EFAULT;
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200260
Samuel Tardieudb165252006-09-07 11:57:00 +0200261 if (options & WDIOS_DISABLECARD) {
262 wdt_disable();
263 retval = 0;
264 }
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200265
Samuel Tardieudb165252006-09-07 11:57:00 +0200266 if (options & WDIOS_ENABLECARD) {
Samuel Tardieu089d8132006-09-07 11:57:00 +0200267 wdt_enable();
Samuel Tardieudb165252006-09-07 11:57:00 +0200268 retval = 0;
269 }
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200270
Samuel Tardieudb165252006-09-07 11:57:00 +0200271 return retval;
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200272 }
273
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000274 case WDIOC_KEEPALIVE:
275 wdt_ping();
276 break;
277
278 case WDIOC_SETTIMEOUT:
279 if (get_user(new_timeout, p))
280 return -EFAULT;
281 if (wdt_set_heartbeat(new_timeout))
282 return -EINVAL;
283 wdt_ping();
284 /* Fall */
285
286 case WDIOC_GETTIMEOUT:
287 return put_user(timeout, p);
288
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200289 default:
Samuel Tardieudb165252006-09-07 11:57:00 +0200290 return -ENOTTY;
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200291 }
292 return 0;
293}
294
Alan Coxc1c8dd32008-05-19 14:09:23 +0100295static int wdt_open(struct inode *inode, struct file *file)
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200296{
297 if (test_and_set_bit(0, &wdt_is_open))
298 return -EBUSY;
299 /*
300 * Activate
301 */
302
Samuel Tardieu089d8132006-09-07 11:57:00 +0200303 wdt_enable();
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200304 return nonseekable_open(inode, file);
305}
306
Alan Coxc1c8dd32008-05-19 14:09:23 +0100307static int wdt_close(struct inode *inode, struct file *file)
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200308{
Alan Coxc1c8dd32008-05-19 14:09:23 +0100309 if (expect_close == 42)
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200310 wdt_disable();
Alan Coxc1c8dd32008-05-19 14:09:23 +0100311 else {
312 printk(KERN_CRIT PFX
313 "Unexpected close, not stopping watchdog!\n");
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200314 wdt_ping();
315 }
316 expect_close = 0;
317 clear_bit(0, &wdt_is_open);
318 return 0;
319}
320
321/*
322 * Notifier for system down
323 */
324
Alan Coxc1c8dd32008-05-19 14:09:23 +0100325static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200326 void *unused)
327{
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000328 if (code == SYS_DOWN || code == SYS_HALT)
329 wdt_disable(); /* Turn the WDT off */
330
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200331 return NOTIFY_DONE;
332}
333
334/*
335 * Kernel Interfaces
336 */
337
Arjan van de Ven2b8693c2007-02-12 00:55:32 -0800338static const struct file_operations wdt_fops = {
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200339 .owner = THIS_MODULE,
340 .llseek = no_llseek,
341 .write = wdt_write,
Alan Coxc1c8dd32008-05-19 14:09:23 +0100342 .unlocked_ioctl = wdt_ioctl,
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200343 .open = wdt_open,
344 .release = wdt_close,
345};
346
347static struct miscdevice wdt_miscdev = {
348 .minor = WATCHDOG_MINOR,
349 .name = "watchdog",
350 .fops = &wdt_fops,
351};
352
353/*
354 * The WDT needs to learn about soft shutdowns in order to
355 * turn the timebomb registers off.
356 */
357
358static struct notifier_block wdt_notifier = {
359 .notifier_call = wdt_notify_sys,
360};
361
Alan Coxc1c8dd32008-05-19 14:09:23 +0100362static int w83697hf_check_wdt(void)
Samuel Tardieuc81b2992006-09-07 11:57:00 +0200363{
364 if (!request_region(wdt_io, 2, WATCHDOG_NAME)) {
Alan Coxc1c8dd32008-05-19 14:09:23 +0100365 printk(KERN_ERR PFX
366 "I/O address 0x%x already in use\n", wdt_io);
Samuel Tardieuc81b2992006-09-07 11:57:00 +0200367 return -EIO;
368 }
369
Alan Coxc1c8dd32008-05-19 14:09:23 +0100370 printk(KERN_DEBUG PFX
371 "Looking for watchdog at address 0x%x\n", wdt_io);
Samuel Tardieuc81b2992006-09-07 11:57:00 +0200372 w83697hf_unlock();
373 if (w83697hf_get_reg(0x20) == 0x60) {
Alan Coxc1c8dd32008-05-19 14:09:23 +0100374 printk(KERN_INFO PFX
375 "watchdog found at address 0x%x\n", wdt_io);
Samuel Tardieuc81b2992006-09-07 11:57:00 +0200376 w83697hf_lock();
377 return 0;
378 }
Alan Coxc1c8dd32008-05-19 14:09:23 +0100379 /* Reprotect in case it was a compatible device */
380 w83697hf_lock();
Samuel Tardieuc81b2992006-09-07 11:57:00 +0200381
Alan Coxc1c8dd32008-05-19 14:09:23 +0100382 printk(KERN_INFO PFX "watchdog not found at address 0x%x\n", wdt_io);
Samuel Tardieuc81b2992006-09-07 11:57:00 +0200383 release_region(wdt_io, 2);
384 return -EIO;
385}
386
Wim Van Sebroecke223f012006-09-15 17:59:07 +0200387static int w83697hf_ioports[] = { 0x2e, 0x4e, 0x00 };
388
Alan Coxc1c8dd32008-05-19 14:09:23 +0100389static int __init wdt_init(void)
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200390{
Wim Van Sebroecke223f012006-09-15 17:59:07 +0200391 int ret, i, found = 0;
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200392
Alan Coxc1c8dd32008-05-19 14:09:23 +0100393 printk(KERN_INFO PFX "WDT driver for W83697HF/HG initializing\n");
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200394
Wim Van Sebroecke223f012006-09-15 17:59:07 +0200395 if (wdt_io == 0) {
396 /* we will autodetect the W83697HF/HG watchdog */
397 for (i = 0; ((!found) && (w83697hf_ioports[i] != 0)); i++) {
398 wdt_io = w83697hf_ioports[i];
Wim Van Sebroeckcde10ba2008-01-18 21:01:34 +0000399 if (!w83697hf_check_wdt())
Wim Van Sebroecke223f012006-09-15 17:59:07 +0200400 found++;
401 }
402 } else {
Samuel Tardieuc81b2992006-09-07 11:57:00 +0200403 if (!w83697hf_check_wdt())
Wim Van Sebroecke223f012006-09-15 17:59:07 +0200404 found++;
Samuel Tardieuc81b2992006-09-07 11:57:00 +0200405 }
406
Wim Van Sebroecke223f012006-09-15 17:59:07 +0200407 if (!found) {
Alan Coxc1c8dd32008-05-19 14:09:23 +0100408 printk(KERN_ERR PFX "No W83697HF/HG could be found\n");
Wim Van Sebroecke223f012006-09-15 17:59:07 +0200409 ret = -EIO;
410 goto out;
411 }
Samuel Tardieuc81b2992006-09-07 11:57:00 +0200412
Samuel Tardieufa69afd2006-09-07 11:57:00 +0200413 w83697hf_init();
Samuel Tardieu6fd65602008-03-12 14:28:03 +0100414 if (early_disable) {
415 if (wdt_running())
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000416 printk(KERN_WARNING PFX "Stopping previously enabled watchdog until userland kicks in\n");
Samuel Tardieu6fd65602008-03-12 14:28:03 +0100417 wdt_disable();
418 }
Samuel Tardieuc81b2992006-09-07 11:57:00 +0200419
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200420 if (wdt_set_heartbeat(timeout)) {
421 wdt_set_heartbeat(WATCHDOG_TIMEOUT);
Alan Coxc1c8dd32008-05-19 14:09:23 +0100422 printk(KERN_INFO PFX
423 "timeout value must be 1 <= timeout <= 255, using %d\n",
424 WATCHDOG_TIMEOUT);
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200425 }
426
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200427 ret = register_reboot_notifier(&wdt_notifier);
428 if (ret != 0) {
Alan Coxc1c8dd32008-05-19 14:09:23 +0100429 printk(KERN_ERR PFX
430 "cannot register reboot notifier (err=%d)\n", ret);
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200431 goto unreg_regions;
432 }
433
434 ret = misc_register(&wdt_miscdev);
435 if (ret != 0) {
Alan Coxc1c8dd32008-05-19 14:09:23 +0100436 printk(KERN_ERR PFX
437 "cannot register miscdev on minor=%d (err=%d)\n",
438 WATCHDOG_MINOR, ret);
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200439 goto unreg_reboot;
440 }
441
Alan Coxc1c8dd32008-05-19 14:09:23 +0100442 printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200443 timeout, nowayout);
444
445out:
446 return ret;
447unreg_reboot:
448 unregister_reboot_notifier(&wdt_notifier);
449unreg_regions:
Samuel Tardieub41a9f52006-09-07 11:57:00 +0200450 release_region(wdt_io, 2);
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200451 goto out;
452}
453
Alan Coxc1c8dd32008-05-19 14:09:23 +0100454static void __exit wdt_exit(void)
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200455{
456 misc_deregister(&wdt_miscdev);
457 unregister_reboot_notifier(&wdt_notifier);
Samuel Tardieub41a9f52006-09-07 11:57:00 +0200458 release_region(wdt_io, 2);
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200459}
460
461module_init(wdt_init);
462module_exit(wdt_exit);
463
464MODULE_LICENSE("GPL");
Samuel Tardieu3fdee8d2006-09-07 11:57:00 +0200465MODULE_AUTHOR("Marcus Junker <junker@anduras.de>, Samuel Tardieu <sam@rfc1149.net>");
Samuel Tardieude710d62006-09-07 11:57:00 +0200466MODULE_DESCRIPTION("w83697hf/hg WDT driver");
Marcus Junkerf9a8c892006-08-24 17:11:50 +0200467MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);