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21
22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24#include <linux/err.h>
25#include <linux/fs.h>
26#include <linux/init.h>
27#include <linux/io.h>
28#include <linux/ioport.h>
29#include <linux/miscdevice.h>
30#include <linux/module.h>
31#include <linux/mutex.h>
32#include <linux/notifier.h>
33#include <linux/reboot.h>
34#include <linux/uaccess.h>
35#include <linux/watchdog.h>
36
37#define DRVNAME "f71808e_wdt"
38
39#define SIO_F71808FG_LD_WDT 0x07
40#define SIO_UNLOCK_KEY 0x87
41#define SIO_LOCK_KEY 0xAA
42
43#define SIO_REG_LDSEL 0x07
44#define SIO_REG_DEVID 0x20
45#define SIO_REG_DEVREV 0x22
46#define SIO_REG_MANID 0x23
47#define SIO_REG_ROM_ADDR_SEL 0x27
48#define SIO_F81866_REG_PORT_SEL 0x27
49#define SIO_REG_MFUNCT1 0x29
50#define SIO_REG_MFUNCT2 0x2a
51#define SIO_REG_MFUNCT3 0x2b
52#define SIO_F81866_REG_GPIO1 0x2c
53#define SIO_REG_ENABLE 0x30
54#define SIO_REG_ADDR 0x60
55
56#define SIO_FINTEK_ID 0x1934
57#define SIO_F71808_ID 0x0901
58#define SIO_F71858_ID 0x0507
59#define SIO_F71862_ID 0x0601
60#define SIO_F71868_ID 0x1106
61#define SIO_F71869_ID 0x0814
62#define SIO_F71869A_ID 0x1007
63#define SIO_F71882_ID 0x0541
64#define SIO_F71889_ID 0x0723
65#define SIO_F81865_ID 0x0704
66#define SIO_F81866_ID 0x1010
67
68#define F71808FG_REG_WDO_CONF 0xf0
69#define F71808FG_REG_WDT_CONF 0xf5
70#define F71808FG_REG_WD_TIME 0xf6
71
72#define F71808FG_FLAG_WDOUT_EN 7
73
74#define F71808FG_FLAG_WDTMOUT_STS 6
75#define F71808FG_FLAG_WD_EN 5
76#define F71808FG_FLAG_WD_PULSE 4
77#define F71808FG_FLAG_WD_UNIT 3
78
79#define F81865_REG_WDO_CONF 0xfa
80#define F81865_FLAG_WDOUT_EN 0
81
82
83#define WATCHDOG_TIMEOUT 60
84#define WATCHDOG_MAX_TIMEOUT (60 * 255)
85#define WATCHDOG_PULSE_WIDTH 125
86
87#define WATCHDOG_F71862FG_PIN 63
88
89
90static unsigned short force_id;
91module_param(force_id, ushort, 0);
92MODULE_PARM_DESC(force_id, "Override the detected device ID");
93
94static const int max_timeout = WATCHDOG_MAX_TIMEOUT;
95static int timeout = WATCHDOG_TIMEOUT;
96module_param(timeout, int, 0);
97MODULE_PARM_DESC(timeout,
98 "Watchdog timeout in seconds. 1<= timeout <="
99 __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
100 __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
101
102static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
103module_param(pulse_width, uint, 0);
104MODULE_PARM_DESC(pulse_width,
105 "Watchdog signal pulse width. 0(=level), 1, 25, 30, 125, 150, 5000 or 6000 ms"
106 " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
107
108static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN;
109module_param(f71862fg_pin, uint, 0);
110MODULE_PARM_DESC(f71862fg_pin,
111 "Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"
112 " (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")");
113
114static bool nowayout = WATCHDOG_NOWAYOUT;
115module_param(nowayout, bool, 0444);
116MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
117
118static unsigned int start_withtimeout;
119module_param(start_withtimeout, uint, 0);
120MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
121 " given initial timeout. Zero (default) disables this feature.");
122
123enum chips { f71808fg, f71858fg, f71862fg, f71868, f71869, f71882fg, f71889fg,
124 f81865, f81866};
125
126static const char *f71808e_names[] = {
127 "f71808fg",
128 "f71858fg",
129 "f71862fg",
130 "f71868",
131 "f71869",
132 "f71882fg",
133 "f71889fg",
134 "f81865",
135 "f81866",
136};
137
138
139static inline int superio_inb(int base, int reg);
140static inline int superio_inw(int base, int reg);
141static inline void superio_outb(int base, int reg, u8 val);
142static inline void superio_set_bit(int base, int reg, int bit);
143static inline void superio_clear_bit(int base, int reg, int bit);
144static inline int superio_enter(int base);
145static inline void superio_select(int base, int ld);
146static inline void superio_exit(int base);
147
148struct watchdog_data {
149 unsigned short sioaddr;
150 enum chips type;
151 unsigned long opened;
152 struct mutex lock;
153 char expect_close;
154 struct watchdog_info ident;
155
156 unsigned short timeout;
157 u8 timer_val;
158 char minutes_mode;
159 u8 pulse_val;
160 char pulse_mode;
161 char caused_reboot;
162};
163
164static struct watchdog_data watchdog = {
165 .lock = __MUTEX_INITIALIZER(watchdog.lock),
166};
167
168
169static inline int superio_inb(int base, int reg)
170{
171 outb(reg, base);
172 return inb(base + 1);
173}
174
175static int superio_inw(int base, int reg)
176{
177 int val;
178 val = superio_inb(base, reg) << 8;
179 val |= superio_inb(base, reg + 1);
180 return val;
181}
182
183static inline void superio_outb(int base, int reg, u8 val)
184{
185 outb(reg, base);
186 outb(val, base + 1);
187}
188
189static inline void superio_set_bit(int base, int reg, int bit)
190{
191 unsigned long val = superio_inb(base, reg);
192 __set_bit(bit, &val);
193 superio_outb(base, reg, val);
194}
195
196static inline void superio_clear_bit(int base, int reg, int bit)
197{
198 unsigned long val = superio_inb(base, reg);
199 __clear_bit(bit, &val);
200 superio_outb(base, reg, val);
201}
202
203static inline int superio_enter(int base)
204{
205
206 if (!request_muxed_region(base, 2, DRVNAME)) {
207 pr_err("I/O address 0x%04x already in use\n", (int)base);
208 return -EBUSY;
209 }
210
211
212 outb(SIO_UNLOCK_KEY, base);
213 outb(SIO_UNLOCK_KEY, base);
214
215 return 0;
216}
217
218static inline void superio_select(int base, int ld)
219{
220 outb(SIO_REG_LDSEL, base);
221 outb(ld, base + 1);
222}
223
224static inline void superio_exit(int base)
225{
226 outb(SIO_LOCK_KEY, base);
227 release_region(base, 2);
228}
229
230static int watchdog_set_timeout(int timeout)
231{
232 if (timeout <= 0
233 || timeout > max_timeout) {
234 pr_err("watchdog timeout out of range\n");
235 return -EINVAL;
236 }
237
238 mutex_lock(&watchdog.lock);
239
240 watchdog.timeout = timeout;
241 if (timeout > 0xff) {
242 watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
243 watchdog.minutes_mode = true;
244 } else {
245 watchdog.timer_val = timeout;
246 watchdog.minutes_mode = false;
247 }
248
249 mutex_unlock(&watchdog.lock);
250
251 return 0;
252}
253
254static int watchdog_set_pulse_width(unsigned int pw)
255{
256 int err = 0;
257 unsigned int t1 = 25, t2 = 125, t3 = 5000;
258
259 if (watchdog.type == f71868) {
260 t1 = 30;
261 t2 = 150;
262 t3 = 6000;
263 }
264
265 mutex_lock(&watchdog.lock);
266
267 if (pw <= 1) {
268 watchdog.pulse_val = 0;
269 } else if (pw <= t1) {
270 watchdog.pulse_val = 1;
271 } else if (pw <= t2) {
272 watchdog.pulse_val = 2;
273 } else if (pw <= t3) {
274 watchdog.pulse_val = 3;
275 } else {
276 pr_err("pulse width out of range\n");
277 err = -EINVAL;
278 goto exit_unlock;
279 }
280
281 watchdog.pulse_mode = pw;
282
283exit_unlock:
284 mutex_unlock(&watchdog.lock);
285 return err;
286}
287
288static int watchdog_keepalive(void)
289{
290 int err = 0;
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 if (watchdog.minutes_mode)
299
300 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
301 F71808FG_FLAG_WD_UNIT);
302 else
303
304 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
305 F71808FG_FLAG_WD_UNIT);
306
307
308 superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,
309 watchdog.timer_val);
310
311 superio_exit(watchdog.sioaddr);
312
313exit_unlock:
314 mutex_unlock(&watchdog.lock);
315 return err;
316}
317
318static int f71862fg_pin_configure(unsigned short ioaddr)
319{
320
321
322
323 if (f71862fg_pin == 63) {
324 if (ioaddr) {
325
326 superio_clear_bit(ioaddr, SIO_REG_ROM_ADDR_SEL, 6);
327 superio_set_bit(ioaddr, SIO_REG_MFUNCT3, 4);
328 }
329 } else if (f71862fg_pin == 56) {
330 if (ioaddr)
331 superio_set_bit(ioaddr, SIO_REG_MFUNCT1, 1);
332 } else {
333 pr_err("Invalid argument f71862fg_pin=%d\n", f71862fg_pin);
334 return -EINVAL;
335 }
336 return 0;
337}
338
339static int watchdog_start(void)
340{
341
342 int err = watchdog_keepalive();
343 if (err)
344 return err;
345
346 mutex_lock(&watchdog.lock);
347 err = superio_enter(watchdog.sioaddr);
348 if (err)
349 goto exit_unlock;
350 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
351
352
353 switch (watchdog.type) {
354 case f71808fg:
355
356 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT2, 3);
357 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 3);
358 break;
359
360 case f71862fg:
361 err = f71862fg_pin_configure(watchdog.sioaddr);
362 if (err)
363 goto exit_superio;
364 break;
365
366 case f71868:
367 case f71869:
368
369 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 4);
370 break;
371
372 case f71882fg:
373
374 superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1);
375 break;
376
377 case f71889fg:
378
379 superio_outb(watchdog.sioaddr, SIO_REG_MFUNCT3,
380 superio_inb(watchdog.sioaddr, SIO_REG_MFUNCT3) & 0xcf);
381 break;
382
383 case f81865:
384
385 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 5);
386 break;
387
388 case f81866:
389
390 superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL,
391 BIT(3) | BIT(0));
392 superio_set_bit(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL,
393 BIT(2));
394
395
396
397
398
399
400 superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_GPIO1,
401 BIT(5));
402 break;
403
404 default:
405
406
407
408
409 err = -ENODEV;
410 goto exit_superio;
411 }
412
413 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
414 superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);
415
416 if (watchdog.type == f81865 || watchdog.type == f81866)
417 superio_set_bit(watchdog.sioaddr, F81865_REG_WDO_CONF,
418 F81865_FLAG_WDOUT_EN);
419 else
420 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,
421 F71808FG_FLAG_WDOUT_EN);
422
423 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
424 F71808FG_FLAG_WD_EN);
425
426 if (watchdog.pulse_mode) {
427
428 u8 wdt_conf = superio_inb(watchdog.sioaddr,
429 F71808FG_REG_WDT_CONF);
430
431
432 wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);
433
434 wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
435
436 superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
437 wdt_conf);
438 } else {
439
440 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
441 F71808FG_FLAG_WD_PULSE);
442 }
443
444exit_superio:
445 superio_exit(watchdog.sioaddr);
446exit_unlock:
447 mutex_unlock(&watchdog.lock);
448
449 return err;
450}
451
452static int watchdog_stop(void)
453{
454 int err = 0;
455
456 mutex_lock(&watchdog.lock);
457 err = superio_enter(watchdog.sioaddr);
458 if (err)
459 goto exit_unlock;
460 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
461
462 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
463 F71808FG_FLAG_WD_EN);
464
465 superio_exit(watchdog.sioaddr);
466
467exit_unlock:
468 mutex_unlock(&watchdog.lock);
469
470 return err;
471}
472
473static int watchdog_get_status(void)
474{
475 int status = 0;
476
477 mutex_lock(&watchdog.lock);
478 status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;
479 mutex_unlock(&watchdog.lock);
480
481 return status;
482}
483
484static bool watchdog_is_running(void)
485{
486
487
488
489
490 bool is_running = true;
491
492 mutex_lock(&watchdog.lock);
493 if (superio_enter(watchdog.sioaddr))
494 goto exit_unlock;
495 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
496
497 is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))
498 && (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)
499 & BIT(F71808FG_FLAG_WD_EN));
500
501 superio_exit(watchdog.sioaddr);
502
503exit_unlock:
504 mutex_unlock(&watchdog.lock);
505 return is_running;
506}
507
508
509
510static int watchdog_open(struct inode *inode, struct file *file)
511{
512 int err;
513
514
515 if (test_and_set_bit(0, &watchdog.opened))
516 return -EBUSY;
517
518 err = watchdog_start();
519 if (err) {
520 clear_bit(0, &watchdog.opened);
521 return err;
522 }
523
524 if (nowayout)
525 __module_get(THIS_MODULE);
526
527 watchdog.expect_close = 0;
528 return nonseekable_open(inode, file);
529}
530
531static int watchdog_release(struct inode *inode, struct file *file)
532{
533 clear_bit(0, &watchdog.opened);
534
535 if (!watchdog.expect_close) {
536 watchdog_keepalive();
537 pr_crit("Unexpected close, not stopping watchdog!\n");
538 } else if (!nowayout) {
539 watchdog_stop();
540 }
541 return 0;
542}
543
544
545
546
547
548
549
550
551
552
553
554
555static ssize_t watchdog_write(struct file *file, const char __user *buf,
556 size_t count, loff_t *ppos)
557{
558 if (count) {
559 if (!nowayout) {
560 size_t i;
561
562
563 bool expect_close = false;
564
565 for (i = 0; i != count; i++) {
566 char c;
567 if (get_user(c, buf + i))
568 return -EFAULT;
569 if (c == 'V')
570 expect_close = true;
571 }
572
573
574 mutex_lock(&watchdog.lock);
575 watchdog.expect_close = expect_close;
576 mutex_unlock(&watchdog.lock);
577 }
578
579
580 watchdog_keepalive();
581 }
582 return count;
583}
584
585
586
587
588
589
590
591
592
593
594
595static long watchdog_ioctl(struct file *file, unsigned int cmd,
596 unsigned long arg)
597{
598 int status;
599 int new_options;
600 int new_timeout;
601 union {
602 struct watchdog_info __user *ident;
603 int __user *i;
604 } uarg;
605
606 uarg.i = (int __user *)arg;
607
608 switch (cmd) {
609 case WDIOC_GETSUPPORT:
610 return copy_to_user(uarg.ident, &watchdog.ident,
611 sizeof(watchdog.ident)) ? -EFAULT : 0;
612
613 case WDIOC_GETSTATUS:
614 status = watchdog_get_status();
615 if (status < 0)
616 return status;
617 return put_user(status, uarg.i);
618
619 case WDIOC_GETBOOTSTATUS:
620 return put_user(0, uarg.i);
621
622 case WDIOC_SETOPTIONS:
623 if (get_user(new_options, uarg.i))
624 return -EFAULT;
625
626 if (new_options & WDIOS_DISABLECARD)
627 watchdog_stop();
628
629 if (new_options & WDIOS_ENABLECARD)
630 return watchdog_start();
631
632
633 case WDIOC_KEEPALIVE:
634 watchdog_keepalive();
635 return 0;
636
637 case WDIOC_SETTIMEOUT:
638 if (get_user(new_timeout, uarg.i))
639 return -EFAULT;
640
641 if (watchdog_set_timeout(new_timeout))
642 return -EINVAL;
643
644 watchdog_keepalive();
645
646
647 case WDIOC_GETTIMEOUT:
648 return put_user(watchdog.timeout, uarg.i);
649
650 default:
651 return -ENOTTY;
652
653 }
654}
655
656static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
657 void *unused)
658{
659 if (code == SYS_DOWN || code == SYS_HALT)
660 watchdog_stop();
661 return NOTIFY_DONE;
662}
663
664static const struct file_operations watchdog_fops = {
665 .owner = THIS_MODULE,
666 .llseek = no_llseek,
667 .open = watchdog_open,
668 .release = watchdog_release,
669 .write = watchdog_write,
670 .unlocked_ioctl = watchdog_ioctl,
671};
672
673static struct miscdevice watchdog_miscdev = {
674 .minor = WATCHDOG_MINOR,
675 .name = "watchdog",
676 .fops = &watchdog_fops,
677};
678
679static struct notifier_block watchdog_notifier = {
680 .notifier_call = watchdog_notify_sys,
681};
682
683static int __init watchdog_init(int sioaddr)
684{
685 int wdt_conf, err = 0;
686
687
688
689
690 watchdog.sioaddr = sioaddr;
691 watchdog.ident.options = WDIOC_SETTIMEOUT
692 | WDIOF_MAGICCLOSE
693 | WDIOF_KEEPALIVEPING;
694
695 snprintf(watchdog.ident.identity,
696 sizeof(watchdog.ident.identity), "%s watchdog",
697 f71808e_names[watchdog.type]);
698
699 err = superio_enter(sioaddr);
700 if (err)
701 return err;
702 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
703
704 wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
705 watchdog.caused_reboot = wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS);
706
707 superio_exit(sioaddr);
708
709 err = watchdog_set_timeout(timeout);
710 if (err)
711 return err;
712 err = watchdog_set_pulse_width(pulse_width);
713 if (err)
714 return err;
715
716 err = register_reboot_notifier(&watchdog_notifier);
717 if (err)
718 return err;
719
720 err = misc_register(&watchdog_miscdev);
721 if (err) {
722 pr_err("cannot register miscdev on minor=%d\n",
723 watchdog_miscdev.minor);
724 goto exit_reboot;
725 }
726
727 if (start_withtimeout) {
728 if (start_withtimeout <= 0
729 || start_withtimeout > max_timeout) {
730 pr_err("starting timeout out of range\n");
731 err = -EINVAL;
732 goto exit_miscdev;
733 }
734
735 err = watchdog_start();
736 if (err) {
737 pr_err("cannot start watchdog timer\n");
738 goto exit_miscdev;
739 }
740
741 mutex_lock(&watchdog.lock);
742 err = superio_enter(sioaddr);
743 if (err)
744 goto exit_unlock;
745 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
746
747 if (start_withtimeout > 0xff) {
748
749 superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
750 F71808FG_FLAG_WD_UNIT);
751 superio_outb(sioaddr, F71808FG_REG_WD_TIME,
752 DIV_ROUND_UP(start_withtimeout, 60));
753 } else {
754
755 superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
756 F71808FG_FLAG_WD_UNIT);
757 superio_outb(sioaddr, F71808FG_REG_WD_TIME,
758 start_withtimeout);
759 }
760
761 superio_exit(sioaddr);
762 mutex_unlock(&watchdog.lock);
763
764 if (nowayout)
765 __module_get(THIS_MODULE);
766
767 pr_info("watchdog started with initial timeout of %u sec\n",
768 start_withtimeout);
769 }
770
771 return 0;
772
773exit_unlock:
774 mutex_unlock(&watchdog.lock);
775exit_miscdev:
776 misc_deregister(&watchdog_miscdev);
777exit_reboot:
778 unregister_reboot_notifier(&watchdog_notifier);
779
780 return err;
781}
782
783static int __init f71808e_find(int sioaddr)
784{
785 u16 devid;
786 int err = superio_enter(sioaddr);
787 if (err)
788 return err;
789
790 devid = superio_inw(sioaddr, SIO_REG_MANID);
791 if (devid != SIO_FINTEK_ID) {
792 pr_debug("Not a Fintek device\n");
793 err = -ENODEV;
794 goto exit;
795 }
796
797 devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
798 switch (devid) {
799 case SIO_F71808_ID:
800 watchdog.type = f71808fg;
801 break;
802 case SIO_F71862_ID:
803 watchdog.type = f71862fg;
804 err = f71862fg_pin_configure(0);
805 break;
806 case SIO_F71868_ID:
807 watchdog.type = f71868;
808 break;
809 case SIO_F71869_ID:
810 case SIO_F71869A_ID:
811 watchdog.type = f71869;
812 break;
813 case SIO_F71882_ID:
814 watchdog.type = f71882fg;
815 break;
816 case SIO_F71889_ID:
817 watchdog.type = f71889fg;
818 break;
819 case SIO_F71858_ID:
820
821 err = -ENODEV;
822 goto exit;
823 case SIO_F81865_ID:
824 watchdog.type = f81865;
825 break;
826 case SIO_F81866_ID:
827 watchdog.type = f81866;
828 break;
829 default:
830 pr_info("Unrecognized Fintek device: %04x\n",
831 (unsigned int)devid);
832 err = -ENODEV;
833 goto exit;
834 }
835
836 pr_info("Found %s watchdog chip, revision %d\n",
837 f71808e_names[watchdog.type],
838 (int)superio_inb(sioaddr, SIO_REG_DEVREV));
839exit:
840 superio_exit(sioaddr);
841 return err;
842}
843
844static int __init f71808e_init(void)
845{
846 static const unsigned short addrs[] = { 0x2e, 0x4e };
847 int err = -ENODEV;
848 int i;
849
850 for (i = 0; i < ARRAY_SIZE(addrs); i++) {
851 err = f71808e_find(addrs[i]);
852 if (err == 0)
853 break;
854 }
855 if (i == ARRAY_SIZE(addrs))
856 return err;
857
858 return watchdog_init(addrs[i]);
859}
860
861static void __exit f71808e_exit(void)
862{
863 if (watchdog_is_running()) {
864 pr_warn("Watchdog timer still running, stopping it\n");
865 watchdog_stop();
866 }
867 misc_deregister(&watchdog_miscdev);
868 unregister_reboot_notifier(&watchdog_notifier);
869}
870
871MODULE_DESCRIPTION("F71808E Watchdog Driver");
872MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
873MODULE_LICENSE("GPL");
874
875module_init(f71808e_init);
876module_exit(f71808e_exit);
877
