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Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -07001/*
2 * W83977F Watchdog Timer Driver for Winbond W83977F I/O Chip
3 *
4 * (c) Copyright 2005 Jose Goncalves <jose.goncalves@inov.pt>
5 *
6 * Based on w83877f_wdt.c by Scott Jennings,
7 * and wdt977.c by Woody Suwalski
8 *
9 * -----------------------
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 *
16 */
17
18#include <linux/module.h>
19#include <linux/moduleparam.h>
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -070020#include <linux/types.h>
21#include <linux/kernel.h>
22#include <linux/fs.h>
23#include <linux/miscdevice.h>
24#include <linux/init.h>
25#include <linux/ioport.h>
26#include <linux/watchdog.h>
27#include <linux/notifier.h>
28#include <linux/reboot.h>
Alan Cox84af4012008-05-19 14:09:34 +010029#include <linux/uaccess.h>
30#include <linux/io.h>
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -070031
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -070032#include <asm/system.h>
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -070033
34#define WATCHDOG_VERSION "1.00"
35#define WATCHDOG_NAME "W83977F WDT"
36#define PFX WATCHDOG_NAME ": "
37#define DRIVER_VERSION WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n"
38
39#define IO_INDEX_PORT 0x3F0
40#define IO_DATA_PORT (IO_INDEX_PORT+1)
41
42#define UNLOCK_DATA 0x87
43#define LOCK_DATA 0xAA
44#define DEVICE_REGISTER 0x07
45
46#define DEFAULT_TIMEOUT 45 /* default timeout in seconds */
47
48static int timeout = DEFAULT_TIMEOUT;
49static int timeoutW; /* timeout in watchdog counter units */
50static unsigned long timer_alive;
51static int testmode;
52static char expect_close;
Alexey Dobriyanc7dfd0c2007-11-01 16:27:08 -070053static DEFINE_SPINLOCK(spinlock);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -070054
55module_param(timeout, int, 0);
Alan Cox84af4012008-05-19 14:09:34 +010056MODULE_PARM_DESC(timeout,
57 "Watchdog timeout in seconds (15..7635), default="
58 __MODULE_STRING(DEFAULT_TIMEOUT) ")");
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -070059module_param(testmode, int, 0);
Alan Cox84af4012008-05-19 14:09:34 +010060MODULE_PARM_DESC(testmode, "Watchdog testmode (1 = no reboot), default=0");
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -070061
Wim Van Sebroeck3908bb12005-09-11 23:58:22 +020062static int nowayout = WATCHDOG_NOWAYOUT;
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -070063module_param(nowayout, int, 0);
Alan Cox84af4012008-05-19 14:09:34 +010064MODULE_PARM_DESC(nowayout,
65 "Watchdog cannot be stopped once started (default="
66 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -070067
68/*
69 * Start the watchdog
70 */
71
72static int wdt_start(void)
73{
74 unsigned long flags;
75
76 spin_lock_irqsave(&spinlock, flags);
77
78 /* Unlock the SuperIO chip */
Alan Cox84af4012008-05-19 14:09:34 +010079 outb_p(UNLOCK_DATA, IO_INDEX_PORT);
80 outb_p(UNLOCK_DATA, IO_INDEX_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -070081
82 /*
83 * Select device Aux2 (device=8) to set watchdog regs F2, F3 and F4.
84 * F2 has the timeout in watchdog counter units.
85 * F3 is set to enable watchdog LED blink at timeout.
86 * F4 is used to just clear the TIMEOUT'ed state (bit 0).
87 */
Alan Cox84af4012008-05-19 14:09:34 +010088 outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
89 outb_p(0x08, IO_DATA_PORT);
90 outb_p(0xF2, IO_INDEX_PORT);
91 outb_p(timeoutW, IO_DATA_PORT);
92 outb_p(0xF3, IO_INDEX_PORT);
93 outb_p(0x08, IO_DATA_PORT);
94 outb_p(0xF4, IO_INDEX_PORT);
95 outb_p(0x00, IO_DATA_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -070096
97 /* Set device Aux2 active */
Alan Cox84af4012008-05-19 14:09:34 +010098 outb_p(0x30, IO_INDEX_PORT);
99 outb_p(0x01, IO_DATA_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700100
Alan Cox84af4012008-05-19 14:09:34 +0100101 /*
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700102 * Select device Aux1 (dev=7) to set GP16 as the watchdog output
103 * (in reg E6) and GP13 as the watchdog LED output (in reg E3).
104 * Map GP16 at pin 119.
105 * In test mode watch the bit 0 on F4 to indicate "triggered" or
106 * check watchdog LED on SBC.
107 */
Alan Cox84af4012008-05-19 14:09:34 +0100108 outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
109 outb_p(0x07, IO_DATA_PORT);
110 if (!testmode) {
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700111 unsigned pin_map;
112
Alan Cox84af4012008-05-19 14:09:34 +0100113 outb_p(0xE6, IO_INDEX_PORT);
114 outb_p(0x0A, IO_DATA_PORT);
115 outb_p(0x2C, IO_INDEX_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700116 pin_map = inb_p(IO_DATA_PORT);
117 pin_map |= 0x10;
118 pin_map &= ~(0x20);
Alan Cox84af4012008-05-19 14:09:34 +0100119 outb_p(0x2C, IO_INDEX_PORT);
120 outb_p(pin_map, IO_DATA_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700121 }
Alan Cox84af4012008-05-19 14:09:34 +0100122 outb_p(0xE3, IO_INDEX_PORT);
123 outb_p(0x08, IO_DATA_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700124
125 /* Set device Aux1 active */
Alan Cox84af4012008-05-19 14:09:34 +0100126 outb_p(0x30, IO_INDEX_PORT);
127 outb_p(0x01, IO_DATA_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700128
129 /* Lock the SuperIO chip */
Alan Cox84af4012008-05-19 14:09:34 +0100130 outb_p(LOCK_DATA, IO_INDEX_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700131
132 spin_unlock_irqrestore(&spinlock, flags);
133
134 printk(KERN_INFO PFX "activated.\n");
135
136 return 0;
137}
138
139/*
140 * Stop the watchdog
141 */
142
143static int wdt_stop(void)
144{
145 unsigned long flags;
146
147 spin_lock_irqsave(&spinlock, flags);
148
149 /* Unlock the SuperIO chip */
Alan Cox84af4012008-05-19 14:09:34 +0100150 outb_p(UNLOCK_DATA, IO_INDEX_PORT);
151 outb_p(UNLOCK_DATA, IO_INDEX_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700152
Alan Cox84af4012008-05-19 14:09:34 +0100153 /*
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700154 * Select device Aux2 (device=8) to set watchdog regs F2, F3 and F4.
155 * F2 is reset to its default value (watchdog timer disabled).
156 * F3 is reset to its default state.
157 * F4 clears the TIMEOUT'ed state (bit 0) - back to default.
158 */
Alan Cox84af4012008-05-19 14:09:34 +0100159 outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
160 outb_p(0x08, IO_DATA_PORT);
161 outb_p(0xF2, IO_INDEX_PORT);
162 outb_p(0xFF, IO_DATA_PORT);
163 outb_p(0xF3, IO_INDEX_PORT);
164 outb_p(0x00, IO_DATA_PORT);
165 outb_p(0xF4, IO_INDEX_PORT);
166 outb_p(0x00, IO_DATA_PORT);
167 outb_p(0xF2, IO_INDEX_PORT);
168 outb_p(0x00, IO_DATA_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700169
170 /*
Alan Cox84af4012008-05-19 14:09:34 +0100171 * Select device Aux1 (dev=7) to set GP16 (in reg E6) and
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700172 * Gp13 (in reg E3) as inputs.
173 */
Alan Cox84af4012008-05-19 14:09:34 +0100174 outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
175 outb_p(0x07, IO_DATA_PORT);
176 if (!testmode) {
177 outb_p(0xE6, IO_INDEX_PORT);
178 outb_p(0x01, IO_DATA_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700179 }
Alan Cox84af4012008-05-19 14:09:34 +0100180 outb_p(0xE3, IO_INDEX_PORT);
181 outb_p(0x01, IO_DATA_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700182
183 /* Lock the SuperIO chip */
Alan Cox84af4012008-05-19 14:09:34 +0100184 outb_p(LOCK_DATA, IO_INDEX_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700185
186 spin_unlock_irqrestore(&spinlock, flags);
187
188 printk(KERN_INFO PFX "shutdown.\n");
189
190 return 0;
191}
192
193/*
194 * Send a keepalive ping to the watchdog
195 * This is done by simply re-writing the timeout to reg. 0xF2
196 */
197
198static int wdt_keepalive(void)
199{
200 unsigned long flags;
201
202 spin_lock_irqsave(&spinlock, flags);
203
204 /* Unlock the SuperIO chip */
Alan Cox84af4012008-05-19 14:09:34 +0100205 outb_p(UNLOCK_DATA, IO_INDEX_PORT);
206 outb_p(UNLOCK_DATA, IO_INDEX_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700207
208 /* Select device Aux2 (device=8) to kick watchdog reg F2 */
Alan Cox84af4012008-05-19 14:09:34 +0100209 outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
210 outb_p(0x08, IO_DATA_PORT);
211 outb_p(0xF2, IO_INDEX_PORT);
212 outb_p(timeoutW, IO_DATA_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700213
214 /* Lock the SuperIO chip */
Alan Cox84af4012008-05-19 14:09:34 +0100215 outb_p(LOCK_DATA, IO_INDEX_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700216
217 spin_unlock_irqrestore(&spinlock, flags);
218
219 return 0;
220}
221
222/*
223 * Set the watchdog timeout value
224 */
225
226static int wdt_set_timeout(int t)
227{
228 int tmrval;
229
230 /*
231 * Convert seconds to watchdog counter time units, rounding up.
Alan Cox84af4012008-05-19 14:09:34 +0100232 * On PCM-5335 watchdog units are 30 seconds/step with 15 sec startup
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700233 * value. This information is supplied in the PCM-5335 manual and was
234 * checked by me on a real board. This is a bit strange because W83977f
235 * datasheet says counter unit is in minutes!
236 */
237 if (t < 15)
238 return -EINVAL;
239
240 tmrval = ((t + 15) + 29) / 30;
241
242 if (tmrval > 255)
243 return -EINVAL;
244
245 /*
Alan Cox84af4012008-05-19 14:09:34 +0100246 * timeout is the timeout in seconds,
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700247 * timeoutW is the timeout in watchdog counter units.
248 */
249 timeoutW = tmrval;
250 timeout = (timeoutW * 30) - 15;
251 return 0;
252}
253
254/*
255 * Get the watchdog status
256 */
257
258static int wdt_get_status(int *status)
259{
260 int new_status;
261 unsigned long flags;
262
263 spin_lock_irqsave(&spinlock, flags);
264
265 /* Unlock the SuperIO chip */
Alan Cox84af4012008-05-19 14:09:34 +0100266 outb_p(UNLOCK_DATA, IO_INDEX_PORT);
267 outb_p(UNLOCK_DATA, IO_INDEX_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700268
269 /* Select device Aux2 (device=8) to read watchdog reg F4 */
Alan Cox84af4012008-05-19 14:09:34 +0100270 outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
271 outb_p(0x08, IO_DATA_PORT);
272 outb_p(0xF4, IO_INDEX_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700273 new_status = inb_p(IO_DATA_PORT);
274
275 /* Lock the SuperIO chip */
Alan Cox84af4012008-05-19 14:09:34 +0100276 outb_p(LOCK_DATA, IO_INDEX_PORT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700277
278 spin_unlock_irqrestore(&spinlock, flags);
279
280 *status = 0;
281 if (new_status & 1)
282 *status |= WDIOF_CARDRESET;
283
284 return 0;
285}
286
287
288/*
289 * /dev/watchdog handling
290 */
291
292static int wdt_open(struct inode *inode, struct file *file)
293{
294 /* If the watchdog is alive we don't need to start it again */
Alan Cox84af4012008-05-19 14:09:34 +0100295 if (test_and_set_bit(0, &timer_alive))
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700296 return -EBUSY;
297
298 if (nowayout)
299 __module_get(THIS_MODULE);
300
301 wdt_start();
302 return nonseekable_open(inode, file);
303}
304
305static int wdt_release(struct inode *inode, struct file *file)
306{
307 /*
308 * Shut off the timer.
309 * Lock it in if it's a module and we set nowayout
310 */
Alan Cox84af4012008-05-19 14:09:34 +0100311 if (expect_close == 42) {
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700312 wdt_stop();
313 clear_bit(0, &timer_alive);
314 } else {
315 wdt_keepalive();
Alan Cox84af4012008-05-19 14:09:34 +0100316 printk(KERN_CRIT PFX
317 "unexpected close, not stopping watchdog!\n");
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700318 }
319 expect_close = 0;
320 return 0;
321}
322
323/*
324 * wdt_write:
325 * @file: file handle to the watchdog
326 * @buf: buffer to write (unused as data does not matter here
327 * @count: count of bytes
328 * @ppos: pointer to the position to write. No seeks allowed
329 *
330 * A write to a watchdog device is defined as a keepalive signal. Any
331 * write of data will do, as we we don't define content meaning.
332 */
333
334static ssize_t wdt_write(struct file *file, const char __user *buf,
335 size_t count, loff_t *ppos)
336{
337 /* See if we got the magic character 'V' and reload the timer */
Alan Cox84af4012008-05-19 14:09:34 +0100338 if (count) {
339 if (!nowayout) {
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700340 size_t ofs;
341
Alan Cox84af4012008-05-19 14:09:34 +0100342 /* note: just in case someone wrote the
343 magic character long ago */
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700344 expect_close = 0;
345
Alan Cox84af4012008-05-19 14:09:34 +0100346 /* scan to see whether or not we got the
347 magic character */
348 for (ofs = 0; ofs != count; ofs++) {
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700349 char c;
350 if (get_user(c, buf + ofs))
351 return -EFAULT;
Alan Cox84af4012008-05-19 14:09:34 +0100352 if (c == 'V')
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700353 expect_close = 42;
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700354 }
355 }
356
357 /* someone wrote to us, we should restart timer */
358 wdt_keepalive();
359 }
360 return count;
361}
362
363/*
364 * wdt_ioctl:
365 * @inode: inode of the device
366 * @file: file handle to the device
367 * @cmd: watchdog command
368 * @arg: argument pointer
369 *
370 * The watchdog API defines a common set of functions for all watchdogs
371 * according to their available features.
372 */
373
374static struct watchdog_info ident = {
375 .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
376 .firmware_version = 1,
377 .identity = WATCHDOG_NAME,
378};
379
Alan Cox84af4012008-05-19 14:09:34 +0100380static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700381{
382 int status;
383 int new_options, retval = -EINVAL;
384 int new_timeout;
385 union {
386 struct watchdog_info __user *ident;
387 int __user *i;
388 } uarg;
389
390 uarg.i = (int __user *)arg;
391
Alan Cox84af4012008-05-19 14:09:34 +0100392 switch (cmd) {
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700393 case WDIOC_GETSUPPORT:
Alan Cox84af4012008-05-19 14:09:34 +0100394 return copy_to_user(uarg.ident, &ident,
395 sizeof(ident)) ? -EFAULT : 0;
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700396
397 case WDIOC_GETSTATUS:
398 wdt_get_status(&status);
399 return put_user(status, uarg.i);
400
401 case WDIOC_GETBOOTSTATUS:
402 return put_user(0, uarg.i);
403
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700404 case WDIOC_SETOPTIONS:
Alan Cox84af4012008-05-19 14:09:34 +0100405 if (get_user(new_options, uarg.i))
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700406 return -EFAULT;
407
408 if (new_options & WDIOS_DISABLECARD) {
409 wdt_stop();
410 retval = 0;
411 }
412
413 if (new_options & WDIOS_ENABLECARD) {
414 wdt_start();
415 retval = 0;
416 }
417
418 return retval;
419
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000420 case WDIOC_KEEPALIVE:
421 wdt_keepalive();
422 return 0;
423
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700424 case WDIOC_SETTIMEOUT:
425 if (get_user(new_timeout, uarg.i))
426 return -EFAULT;
427
428 if (wdt_set_timeout(new_timeout))
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +0000429 return -EINVAL;
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700430
431 wdt_keepalive();
432 /* Fall */
433
434 case WDIOC_GETTIMEOUT:
435 return put_user(timeout, uarg.i);
436
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000437 default:
438 return -ENOTTY;
439
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700440 }
441}
442
443static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
444 void *unused)
445{
Alan Cox84af4012008-05-19 14:09:34 +0100446 if (code == SYS_DOWN || code == SYS_HALT)
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700447 wdt_stop();
448 return NOTIFY_DONE;
449}
450
Alan Cox84af4012008-05-19 14:09:34 +0100451static const struct file_operations wdt_fops = {
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700452 .owner = THIS_MODULE,
453 .llseek = no_llseek,
454 .write = wdt_write,
Alan Cox84af4012008-05-19 14:09:34 +0100455 .unlocked_ioctl = wdt_ioctl,
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700456 .open = wdt_open,
457 .release = wdt_release,
458};
459
Alan Cox84af4012008-05-19 14:09:34 +0100460static struct miscdevice wdt_miscdev = {
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700461 .minor = WATCHDOG_MINOR,
462 .name = "watchdog",
463 .fops = &wdt_fops,
464};
465
466static struct notifier_block wdt_notifier = {
467 .notifier_call = wdt_notify_sys,
468};
469
470static int __init w83977f_wdt_init(void)
471{
472 int rc;
473
Alan Cox84af4012008-05-19 14:09:34 +0100474 printk(KERN_INFO PFX DRIVER_VERSION);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700475
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700476 /*
Alan Cox84af4012008-05-19 14:09:34 +0100477 * Check that the timeout value is within it's range;
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700478 * if not reset to the default
479 */
480 if (wdt_set_timeout(timeout)) {
481 wdt_set_timeout(DEFAULT_TIMEOUT);
Alan Cox84af4012008-05-19 14:09:34 +0100482 printk(KERN_INFO PFX
483 "timeout value must be 15 <= timeout <= 7635, using %d\n",
484 DEFAULT_TIMEOUT);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700485 }
486
Alan Cox84af4012008-05-19 14:09:34 +0100487 if (!request_region(IO_INDEX_PORT, 2, WATCHDOG_NAME)) {
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700488 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
489 IO_INDEX_PORT);
490 rc = -EIO;
491 goto err_out;
492 }
493
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700494 rc = register_reboot_notifier(&wdt_notifier);
Alan Cox84af4012008-05-19 14:09:34 +0100495 if (rc) {
496 printk(KERN_ERR PFX
497 "cannot register reboot notifier (err=%d)\n", rc);
Wim Van Sebroeckc6cb13a2007-12-26 20:32:51 +0000498 goto err_out_region;
499 }
500
501 rc = misc_register(&wdt_miscdev);
Alan Cox84af4012008-05-19 14:09:34 +0100502 if (rc) {
503 printk(KERN_ERR PFX
504 "cannot register miscdev on minor=%d (err=%d)\n",
505 wdt_miscdev.minor, rc);
Wim Van Sebroeckc6cb13a2007-12-26 20:32:51 +0000506 goto err_out_reboot;
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700507 }
508
Alan Cox84af4012008-05-19 14:09:34 +0100509 printk(KERN_INFO PFX
510 "initialized. timeout=%d sec (nowayout=%d testmode=%d)\n",
511 timeout, nowayout, testmode);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700512
513 return 0;
514
Wim Van Sebroeckc6cb13a2007-12-26 20:32:51 +0000515err_out_reboot:
516 unregister_reboot_notifier(&wdt_notifier);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700517err_out_region:
Alan Cox84af4012008-05-19 14:09:34 +0100518 release_region(IO_INDEX_PORT, 2);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700519err_out:
520 return rc;
521}
522
523static void __exit w83977f_wdt_exit(void)
524{
525 wdt_stop();
526 misc_deregister(&wdt_miscdev);
527 unregister_reboot_notifier(&wdt_notifier);
Alan Cox84af4012008-05-19 14:09:34 +0100528 release_region(IO_INDEX_PORT, 2);
Jose Miguel Goncalvesb4cc4aa2005-09-06 17:05:30 -0700529}
530
531module_init(w83977f_wdt_init);
532module_exit(w83977f_wdt_exit);
533
534MODULE_AUTHOR("Jose Goncalves <jose.goncalves@inov.pt>");
535MODULE_DESCRIPTION("Driver for watchdog timer in W83977F I/O chip");
536MODULE_LICENSE("GPL");
537MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);