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Giel van Schijndel96cb4eb2010-08-01 15:30:55 +02001/***************************************************************************
2 * Copyright (C) 2006 by Hans Edgington <hans@edgington.nl> *
3 * Copyright (C) 2007-2009 Hans de Goede <hdegoede@redhat.com> *
4 * Copyright (C) 2010 Giel van Schijndel <me@mortis.eu> *
5 * *
6 * This program is free software; you can redistribute it and/or modify *
7 * it under the terms of the GNU General Public License as published by *
8 * the Free Software Foundation; either version 2 of the License, or *
9 * (at your option) any later version. *
10 * *
11 * This program is distributed in the hope that it will be useful, *
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
14 * GNU General Public License for more details. *
15 * *
16 * You should have received a copy of the GNU General Public License *
17 * along with this program; if not, write to the *
18 * Free Software Foundation, Inc., *
19 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
20 ***************************************************************************/
21
22#include <linux/err.h>
23#include <linux/fs.h>
24#include <linux/init.h>
25#include <linux/io.h>
26#include <linux/ioport.h>
27#include <linux/miscdevice.h>
28#include <linux/module.h>
29#include <linux/mutex.h>
30#include <linux/notifier.h>
31#include <linux/reboot.h>
32#include <linux/uaccess.h>
33#include <linux/watchdog.h>
34
35#define DRVNAME "f71808e_wdt"
36
37#define SIO_F71808FG_LD_WDT 0x07 /* Watchdog timer logical device */
38#define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */
39#define SIO_LOCK_KEY 0xAA /* Key to diasble Super-I/O */
40
41#define SIO_REG_LDSEL 0x07 /* Logical device select */
42#define SIO_REG_DEVID 0x20 /* Device ID (2 bytes) */
43#define SIO_REG_DEVREV 0x22 /* Device revision */
44#define SIO_REG_MANID 0x23 /* Fintek ID (2 bytes) */
45#define SIO_REG_ENABLE 0x30 /* Logical device enable */
46#define SIO_REG_ADDR 0x60 /* Logical device address (2 bytes) */
47
48#define SIO_FINTEK_ID 0x1934 /* Manufacturers ID */
49#define SIO_F71808_ID 0x0901 /* Chipset ID */
50#define SIO_F71858_ID 0x0507 /* Chipset ID */
51#define SIO_F71862_ID 0x0601 /* Chipset ID */
52#define SIO_F71882_ID 0x0541 /* Chipset ID */
53#define SIO_F71889_ID 0x0723 /* Chipset ID */
54
55#define F71882FG_REG_START 0x01
56
57#define F71808FG_REG_WDO_CONF 0xf0
58#define F71808FG_REG_WDT_CONF 0xf5
59#define F71808FG_REG_WD_TIME 0xf6
60
61#define F71808FG_FLAG_WDOUT_EN 7
62
63#define F71808FG_FLAG_WDTMOUT_STS 5
64#define F71808FG_FLAG_WD_EN 5
65#define F71808FG_FLAG_WD_PULSE 4
66#define F71808FG_FLAG_WD_UNIT 3
67
68/* Default values */
69#define WATCHDOG_TIMEOUT 60 /* 1 minute default timeout */
70#define WATCHDOG_MAX_TIMEOUT (60 * 255)
71#define WATCHDOG_PULSE_WIDTH 125 /* 125 ms, default pulse width for
72 watchdog signal */
73
74static unsigned short force_id;
75module_param(force_id, ushort, 0);
76MODULE_PARM_DESC(force_id, "Override the detected device ID");
77
78static const int max_timeout = WATCHDOG_MAX_TIMEOUT;
79static int timeout = 60; /* default timeout in seconds */
80module_param(timeout, int, 0);
81MODULE_PARM_DESC(timeout,
82 "Watchdog timeout in seconds. 1<= timeout <="
83 __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
84 __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
85
86static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
87module_param(pulse_width, uint, 0);
88MODULE_PARM_DESC(pulse_width,
89 "Watchdog signal pulse width. 0(=level), 1 ms, 25 ms, 125 ms or 5000 ms"
90 " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
91
92static int nowayout = WATCHDOG_NOWAYOUT;
93module_param(nowayout, bool, 0444);
94MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
95
96static unsigned int start_withtimeout;
97module_param(start_withtimeout, uint, 0);
98MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
99 " given initial timeout. Zero (default) disables this feature.");
100
101enum chips { f71808fg, f71858fg, f71862fg, f71882fg, f71889fg };
102
103static const char *f71808e_names[] = {
104 "f71808fg",
105 "f71858fg",
106 "f71862fg",
107 "f71882fg",
108 "f71889fg",
109};
110
111/* Super-I/O Function prototypes */
112static inline int superio_inb(int base, int reg);
113static inline int superio_inw(int base, int reg);
114static inline void superio_outb(int base, int reg, u8 val);
115static inline void superio_set_bit(int base, int reg, int bit);
116static inline void superio_clear_bit(int base, int reg, int bit);
117static inline int superio_enter(int base);
118static inline void superio_select(int base, int ld);
119static inline void superio_exit(int base);
120
121struct watchdog_data {
122 unsigned short sioaddr;
123 enum chips type;
124 unsigned long opened;
125 struct mutex lock;
126 char expect_close;
127 struct watchdog_info ident;
128
129 unsigned short timeout;
130 u8 timer_val; /* content for the wd_time register */
131 char minutes_mode;
132 u8 pulse_val; /* pulse width flag */
133 char pulse_mode; /* enable pulse output mode? */
134 char caused_reboot; /* last reboot was by the watchdog */
135};
136
137static struct watchdog_data watchdog = {
138 .lock = __MUTEX_INITIALIZER(watchdog.lock),
139};
140
141/* Super I/O functions */
142static inline int superio_inb(int base, int reg)
143{
144 outb(reg, base);
145 return inb(base + 1);
146}
147
148static int superio_inw(int base, int reg)
149{
150 int val;
151 val = superio_inb(base, reg) << 8;
152 val |= superio_inb(base, reg + 1);
153 return val;
154}
155
156static inline void superio_outb(int base, int reg, u8 val)
157{
158 outb(reg, base);
159 outb(val, base + 1);
160}
161
162static inline void superio_set_bit(int base, int reg, int bit)
163{
164 unsigned long val = superio_inb(base, reg);
165 __set_bit(bit, &val);
166 superio_outb(base, reg, val);
167}
168
169static inline void superio_clear_bit(int base, int reg, int bit)
170{
171 unsigned long val = superio_inb(base, reg);
172 __clear_bit(bit, &val);
173 superio_outb(base, reg, val);
174}
175
176static inline int superio_enter(int base)
177{
178 /* Don't step on other drivers' I/O space by accident */
179 if (!request_muxed_region(base, 2, DRVNAME)) {
180 printk(KERN_ERR DRVNAME ": I/O address 0x%04x already in use\n",
181 (int)base);
182 return -EBUSY;
183 }
184
185 /* according to the datasheet the key must be send twice! */
186 outb(SIO_UNLOCK_KEY, base);
187 outb(SIO_UNLOCK_KEY, base);
188
189 return 0;
190}
191
192static inline void superio_select(int base, int ld)
193{
194 outb(SIO_REG_LDSEL, base);
195 outb(ld, base + 1);
196}
197
198static inline void superio_exit(int base)
199{
200 outb(SIO_LOCK_KEY, base);
201 release_region(base, 2);
202}
203
204static int watchdog_set_timeout(int timeout)
205{
206 if (timeout <= 0
207 || timeout > max_timeout) {
208 printk(KERN_ERR DRVNAME ": watchdog timeout out of range\n");
209 return -EINVAL;
210 }
211
212 mutex_lock(&watchdog.lock);
213
214 watchdog.timeout = timeout;
215 if (timeout > 0xff) {
216 watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
217 watchdog.minutes_mode = true;
218 } else {
219 watchdog.timer_val = timeout;
220 watchdog.minutes_mode = false;
221 }
222
223 mutex_unlock(&watchdog.lock);
224
225 return 0;
226}
227
228static int watchdog_set_pulse_width(unsigned int pw)
229{
230 int err = 0;
231
232 mutex_lock(&watchdog.lock);
233
234 if (pw <= 1) {
235 watchdog.pulse_val = 0;
236 } else if (pw <= 25) {
237 watchdog.pulse_val = 1;
238 } else if (pw <= 125) {
239 watchdog.pulse_val = 2;
240 } else if (pw <= 5000) {
241 watchdog.pulse_val = 3;
242 } else {
243 printk(KERN_ERR DRVNAME ": pulse width out of range\n");
244 err = -EINVAL;
245 goto exit_unlock;
246 }
247
248 watchdog.pulse_mode = pw;
249
250exit_unlock:
251 mutex_unlock(&watchdog.lock);
252 return err;
253}
254
255static int watchdog_keepalive(void)
256{
257 int err = 0;
258
259 mutex_lock(&watchdog.lock);
260 err = superio_enter(watchdog.sioaddr);
261 if (err)
262 goto exit_unlock;
263 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
264
265 if (watchdog.minutes_mode)
266 /* select minutes for timer units */
267 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
268 F71808FG_FLAG_WD_UNIT);
269 else
270 /* select seconds for timer units */
271 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
272 F71808FG_FLAG_WD_UNIT);
273
274 /* Set timer value */
275 superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,
276 watchdog.timer_val);
277
278 superio_exit(watchdog.sioaddr);
279
280exit_unlock:
281 mutex_unlock(&watchdog.lock);
282 return err;
283}
284
285static int watchdog_start(void)
286{
287 /* Make sure we don't die as soon as the watchdog is enabled below */
288 int err = watchdog_keepalive();
289 if (err)
290 return err;
291
292 mutex_lock(&watchdog.lock);
293 err = superio_enter(watchdog.sioaddr);
294 if (err)
295 goto exit_unlock;
296 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
297
298 /* Watchdog pin configuration */
299 switch (watchdog.type) {
300 case f71808fg:
301 /* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */
302 superio_clear_bit(watchdog.sioaddr, 0x2a, 3);
303 superio_clear_bit(watchdog.sioaddr, 0x2b, 3);
304 break;
305
306 case f71882fg:
307 /* Set pin 56 to WDTRST# */
308 superio_set_bit(watchdog.sioaddr, 0x29, 1);
309 break;
310
Giel van Schijndeldee00ab2010-10-04 10:45:28 +0200311 case f71889fg:
312 /* set pin 40 to WDTRST# */
313 superio_outb(watchdog.sioaddr, 0x2b,
314 superio_inb(watchdog.sioaddr, 0x2b) & 0xcf);
315 break;
316
Giel van Schijndel96cb4eb2010-08-01 15:30:55 +0200317 default:
318 /*
319 * 'default' label to shut up the compiler and catch
320 * programmer errors
321 */
322 err = -ENODEV;
323 goto exit_superio;
324 }
325
326 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
327 superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);
328 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,
329 F71808FG_FLAG_WDOUT_EN);
330
331 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
332 F71808FG_FLAG_WD_EN);
333
334 if (watchdog.pulse_mode) {
335 /* Select "pulse" output mode with given duration */
336 u8 wdt_conf = superio_inb(watchdog.sioaddr,
337 F71808FG_REG_WDT_CONF);
338
339 /* Set WD_PSWIDTH bits (1:0) */
340 wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);
341 /* Set WD_PULSE to "pulse" mode */
342 wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
343
344 superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
345 wdt_conf);
346 } else {
347 /* Select "level" output mode */
348 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
349 F71808FG_FLAG_WD_PULSE);
350 }
351
352exit_superio:
353 superio_exit(watchdog.sioaddr);
354exit_unlock:
355 mutex_unlock(&watchdog.lock);
356
357 return err;
358}
359
360static int watchdog_stop(void)
361{
362 int err = 0;
363
364 mutex_lock(&watchdog.lock);
365 err = superio_enter(watchdog.sioaddr);
366 if (err)
367 goto exit_unlock;
368 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
369
370 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
371 F71808FG_FLAG_WD_EN);
372
373 superio_exit(watchdog.sioaddr);
374
375exit_unlock:
376 mutex_unlock(&watchdog.lock);
377
378 return err;
379}
380
381static int watchdog_get_status(void)
382{
383 int status = 0;
384
385 mutex_lock(&watchdog.lock);
386 status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;
387 mutex_unlock(&watchdog.lock);
388
389 return status;
390}
391
392static bool watchdog_is_running(void)
393{
394 /*
395 * if we fail to determine the watchdog's status assume it to be
396 * running to be on the safe side
397 */
398 bool is_running = true;
399
400 mutex_lock(&watchdog.lock);
401 if (superio_enter(watchdog.sioaddr))
402 goto exit_unlock;
403 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
404
405 is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))
406 && (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)
407 & F71808FG_FLAG_WD_EN);
408
409 superio_exit(watchdog.sioaddr);
410
411exit_unlock:
412 mutex_unlock(&watchdog.lock);
413 return is_running;
414}
415
416/* /dev/watchdog api */
417
418static int watchdog_open(struct inode *inode, struct file *file)
419{
420 int err;
421
422 /* If the watchdog is alive we don't need to start it again */
423 if (test_and_set_bit(0, &watchdog.opened))
424 return -EBUSY;
425
426 err = watchdog_start();
427 if (err) {
428 clear_bit(0, &watchdog.opened);
429 return err;
430 }
431
432 if (nowayout)
433 __module_get(THIS_MODULE);
434
435 watchdog.expect_close = 0;
436 return nonseekable_open(inode, file);
437}
438
439static int watchdog_release(struct inode *inode, struct file *file)
440{
441 clear_bit(0, &watchdog.opened);
442
443 if (!watchdog.expect_close) {
444 watchdog_keepalive();
445 printk(KERN_CRIT DRVNAME
446 ": Unexpected close, not stopping watchdog!\n");
447 } else if (!nowayout) {
448 watchdog_stop();
449 }
450 return 0;
451}
452
453/*
454 * watchdog_write:
455 * @file: file handle to the watchdog
456 * @buf: buffer to write
457 * @count: count of bytes
458 * @ppos: pointer to the position to write. No seeks allowed
459 *
460 * A write to a watchdog device is defined as a keepalive signal. Any
461 * write of data will do, as we we don't define content meaning.
462 */
463
464static ssize_t watchdog_write(struct file *file, const char __user *buf,
465 size_t count, loff_t *ppos)
466{
467 if (count) {
468 if (!nowayout) {
469 size_t i;
470
471 /* In case it was set long ago */
472 bool expect_close = false;
473
474 for (i = 0; i != count; i++) {
475 char c;
476 if (get_user(c, buf + i))
477 return -EFAULT;
478 expect_close = (c == 'V');
479 }
480
481 /* Properly order writes across fork()ed processes */
482 mutex_lock(&watchdog.lock);
483 watchdog.expect_close = expect_close;
484 mutex_unlock(&watchdog.lock);
485 }
486
487 /* someone wrote to us, we should restart timer */
488 watchdog_keepalive();
489 }
490 return count;
491}
492
493/*
494 * watchdog_ioctl:
495 * @inode: inode of the device
496 * @file: file handle to the device
497 * @cmd: watchdog command
498 * @arg: argument pointer
499 *
500 * The watchdog API defines a common set of functions for all watchdogs
501 * according to their available features.
502 */
503static long watchdog_ioctl(struct file *file, unsigned int cmd,
504 unsigned long arg)
505{
506 int status;
507 int new_options;
508 int new_timeout;
509 union {
510 struct watchdog_info __user *ident;
511 int __user *i;
512 } uarg;
513
514 uarg.i = (int __user *)arg;
515
516 switch (cmd) {
517 case WDIOC_GETSUPPORT:
518 return copy_to_user(uarg.ident, &watchdog.ident,
519 sizeof(watchdog.ident)) ? -EFAULT : 0;
520
521 case WDIOC_GETSTATUS:
522 status = watchdog_get_status();
523 if (status < 0)
524 return status;
525 return put_user(status, uarg.i);
526
527 case WDIOC_GETBOOTSTATUS:
528 return put_user(0, uarg.i);
529
530 case WDIOC_SETOPTIONS:
531 if (get_user(new_options, uarg.i))
532 return -EFAULT;
533
534 if (new_options & WDIOS_DISABLECARD)
535 watchdog_stop();
536
537 if (new_options & WDIOS_ENABLECARD)
538 return watchdog_start();
539
540
541 case WDIOC_KEEPALIVE:
542 watchdog_keepalive();
543 return 0;
544
545 case WDIOC_SETTIMEOUT:
546 if (get_user(new_timeout, uarg.i))
547 return -EFAULT;
548
549 if (watchdog_set_timeout(new_timeout))
550 return -EINVAL;
551
552 watchdog_keepalive();
553 /* Fall */
554
555 case WDIOC_GETTIMEOUT:
556 return put_user(watchdog.timeout, uarg.i);
557
558 default:
559 return -ENOTTY;
560
561 }
562}
563
564static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
565 void *unused)
566{
567 if (code == SYS_DOWN || code == SYS_HALT)
568 watchdog_stop();
569 return NOTIFY_DONE;
570}
571
572static const struct file_operations watchdog_fops = {
573 .owner = THIS_MODULE,
574 .llseek = no_llseek,
575 .open = watchdog_open,
576 .release = watchdog_release,
577 .write = watchdog_write,
578 .unlocked_ioctl = watchdog_ioctl,
579};
580
581static struct miscdevice watchdog_miscdev = {
582 .minor = WATCHDOG_MINOR,
583 .name = "watchdog",
584 .fops = &watchdog_fops,
585};
586
587static struct notifier_block watchdog_notifier = {
588 .notifier_call = watchdog_notify_sys,
589};
590
591static int __init watchdog_init(int sioaddr)
592{
593 int wdt_conf, err = 0;
594
595 /* No need to lock watchdog.lock here because no entry points
596 * into the module have been registered yet.
597 */
598 watchdog.sioaddr = sioaddr;
599 watchdog.ident.options = WDIOC_SETTIMEOUT
600 | WDIOF_MAGICCLOSE
601 | WDIOF_KEEPALIVEPING;
602
603 snprintf(watchdog.ident.identity,
604 sizeof(watchdog.ident.identity), "%s watchdog",
605 f71808e_names[watchdog.type]);
606
607 err = superio_enter(sioaddr);
608 if (err)
609 return err;
610 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
611
612 wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
613 watchdog.caused_reboot = wdt_conf & F71808FG_FLAG_WDTMOUT_STS;
614
615 superio_exit(sioaddr);
616
617 err = watchdog_set_timeout(timeout);
618 if (err)
619 return err;
620 err = watchdog_set_pulse_width(pulse_width);
621 if (err)
622 return err;
623
624 err = register_reboot_notifier(&watchdog_notifier);
625 if (err)
626 return err;
627
628 err = misc_register(&watchdog_miscdev);
629 if (err) {
630 printk(KERN_ERR DRVNAME
631 ": cannot register miscdev on minor=%d\n",
632 watchdog_miscdev.minor);
633 goto exit_reboot;
634 }
635
636 if (start_withtimeout) {
637 if (start_withtimeout <= 0
638 || start_withtimeout > max_timeout) {
639 printk(KERN_ERR DRVNAME
640 ": starting timeout out of range\n");
641 err = -EINVAL;
642 goto exit_miscdev;
643 }
644
645 err = watchdog_start();
646 if (err) {
647 printk(KERN_ERR DRVNAME
648 ": cannot start watchdog timer\n");
649 goto exit_miscdev;
650 }
651
652 mutex_lock(&watchdog.lock);
653 err = superio_enter(sioaddr);
654 if (err)
655 goto exit_unlock;
656 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
657
658 if (start_withtimeout > 0xff) {
659 /* select minutes for timer units */
660 superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
661 F71808FG_FLAG_WD_UNIT);
662 superio_outb(sioaddr, F71808FG_REG_WD_TIME,
663 DIV_ROUND_UP(start_withtimeout, 60));
664 } else {
665 /* select seconds for timer units */
666 superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
667 F71808FG_FLAG_WD_UNIT);
668 superio_outb(sioaddr, F71808FG_REG_WD_TIME,
669 start_withtimeout);
670 }
671
672 superio_exit(sioaddr);
673 mutex_unlock(&watchdog.lock);
674
675 if (nowayout)
676 __module_get(THIS_MODULE);
677
678 printk(KERN_INFO DRVNAME
679 ": watchdog started with initial timeout of %u sec\n",
680 start_withtimeout);
681 }
682
683 return 0;
684
685exit_unlock:
686 mutex_unlock(&watchdog.lock);
687exit_miscdev:
688 misc_deregister(&watchdog_miscdev);
689exit_reboot:
690 unregister_reboot_notifier(&watchdog_notifier);
691
692 return err;
693}
694
695static int __init f71808e_find(int sioaddr)
696{
697 u16 devid;
698 int err = superio_enter(sioaddr);
699 if (err)
700 return err;
701
702 devid = superio_inw(sioaddr, SIO_REG_MANID);
703 if (devid != SIO_FINTEK_ID) {
704 pr_debug(DRVNAME ": Not a Fintek device\n");
705 err = -ENODEV;
706 goto exit;
707 }
708
709 devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
710 switch (devid) {
711 case SIO_F71808_ID:
712 watchdog.type = f71808fg;
713 break;
714 case SIO_F71882_ID:
715 watchdog.type = f71882fg;
716 break;
Giel van Schijndel96cb4eb2010-08-01 15:30:55 +0200717 case SIO_F71889_ID:
Giel van Schijndeldee00ab2010-10-04 10:45:28 +0200718 watchdog.type = f71889fg;
719 break;
720 case SIO_F71862_ID:
Giel van Schijndel96cb4eb2010-08-01 15:30:55 +0200721 /* These have a watchdog, though it isn't implemented (yet). */
722 err = -ENOSYS;
723 goto exit;
724 case SIO_F71858_ID:
725 /* Confirmed (by datasheet) not to have a watchdog. */
726 err = -ENODEV;
727 goto exit;
728 default:
729 printk(KERN_INFO DRVNAME ": Unrecognized Fintek device: %04x\n",
730 (unsigned int)devid);
731 err = -ENODEV;
732 goto exit;
733 }
734
735 printk(KERN_INFO DRVNAME ": Found %s watchdog chip, revision %d\n",
736 f71808e_names[watchdog.type],
737 (int)superio_inb(sioaddr, SIO_REG_DEVREV));
738exit:
739 superio_exit(sioaddr);
740 return err;
741}
742
743static int __init f71808e_init(void)
744{
745 static const unsigned short addrs[] = { 0x2e, 0x4e };
746 int err = -ENODEV;
747 int i;
748
749 for (i = 0; i < ARRAY_SIZE(addrs); i++) {
750 err = f71808e_find(addrs[i]);
751 if (err == 0)
752 break;
753 }
754 if (i == ARRAY_SIZE(addrs))
755 return err;
756
757 return watchdog_init(addrs[i]);
758}
759
760static void __exit f71808e_exit(void)
761{
762 if (watchdog_is_running()) {
763 printk(KERN_WARNING DRVNAME
764 ": Watchdog timer still running, stopping it\n");
765 watchdog_stop();
766 }
767 misc_deregister(&watchdog_miscdev);
768 unregister_reboot_notifier(&watchdog_notifier);
769}
770
771MODULE_DESCRIPTION("F71808E Watchdog Driver");
772MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
773MODULE_LICENSE("GPL");
774
775module_init(f71808e_init);
776module_exit(f71808e_exit);