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7
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/err.h>
12#include <linux/fs.h>
13#include <linux/init.h>
14#include <linux/io.h>
15#include <linux/ioport.h>
16#include <linux/miscdevice.h>
17#include <linux/module.h>
18#include <linux/mutex.h>
19#include <linux/notifier.h>
20#include <linux/reboot.h>
21#include <linux/uaccess.h>
22#include <linux/watchdog.h>
23
24#define DRVNAME "f71808e_wdt"
25
26#define SIO_F71808FG_LD_WDT 0x07
27#define SIO_UNLOCK_KEY 0x87
28#define SIO_LOCK_KEY 0xAA
29
30#define SIO_REG_LDSEL 0x07
31#define SIO_REG_DEVID 0x20
32#define SIO_REG_DEVREV 0x22
33#define SIO_REG_MANID 0x23
34#define SIO_REG_ROM_ADDR_SEL 0x27
35#define SIO_F81866_REG_PORT_SEL 0x27
36#define SIO_REG_MFUNCT1 0x29
37#define SIO_REG_MFUNCT2 0x2a
38#define SIO_REG_MFUNCT3 0x2b
39#define SIO_F81866_REG_GPIO1 0x2c
40#define SIO_REG_ENABLE 0x30
41#define SIO_REG_ADDR 0x60
42
43#define SIO_FINTEK_ID 0x1934
44#define SIO_F71808_ID 0x0901
45#define SIO_F71858_ID 0x0507
46#define SIO_F71862_ID 0x0601
47#define SIO_F71868_ID 0x1106
48#define SIO_F71869_ID 0x0814
49#define SIO_F71869A_ID 0x1007
50#define SIO_F71882_ID 0x0541
51#define SIO_F71889_ID 0x0723
52#define SIO_F81865_ID 0x0704
53#define SIO_F81866_ID 0x1010
54
55#define F71808FG_REG_WDO_CONF 0xf0
56#define F71808FG_REG_WDT_CONF 0xf5
57#define F71808FG_REG_WD_TIME 0xf6
58
59#define F71808FG_FLAG_WDOUT_EN 7
60
61#define F71808FG_FLAG_WDTMOUT_STS 6
62#define F71808FG_FLAG_WD_EN 5
63#define F71808FG_FLAG_WD_PULSE 4
64#define F71808FG_FLAG_WD_UNIT 3
65
66#define F81865_REG_WDO_CONF 0xfa
67#define F81865_FLAG_WDOUT_EN 0
68
69
70#define WATCHDOG_TIMEOUT 60
71#define WATCHDOG_MAX_TIMEOUT (60 * 255)
72#define WATCHDOG_PULSE_WIDTH 125
73
74#define WATCHDOG_F71862FG_PIN 63
75
76
77static unsigned short force_id;
78module_param(force_id, ushort, 0);
79MODULE_PARM_DESC(force_id, "Override the detected device ID");
80
81static const int max_timeout = WATCHDOG_MAX_TIMEOUT;
82static int timeout = WATCHDOG_TIMEOUT;
83module_param(timeout, int, 0);
84MODULE_PARM_DESC(timeout,
85 "Watchdog timeout in seconds. 1<= timeout <="
86 __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
87 __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
88
89static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
90module_param(pulse_width, uint, 0);
91MODULE_PARM_DESC(pulse_width,
92 "Watchdog signal pulse width. 0(=level), 1, 25, 30, 125, 150, 5000 or 6000 ms"
93 " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
94
95static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN;
96module_param(f71862fg_pin, uint, 0);
97MODULE_PARM_DESC(f71862fg_pin,
98 "Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"
99 " (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")");
100
101static bool nowayout = WATCHDOG_NOWAYOUT;
102module_param(nowayout, bool, 0444);
103MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
104
105static unsigned int start_withtimeout;
106module_param(start_withtimeout, uint, 0);
107MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
108 " given initial timeout. Zero (default) disables this feature.");
109
110enum chips { f71808fg, f71858fg, f71862fg, f71868, f71869, f71882fg, f71889fg,
111 f81865, f81866};
112
113static const char *f71808e_names[] = {
114 "f71808fg",
115 "f71858fg",
116 "f71862fg",
117 "f71868",
118 "f71869",
119 "f71882fg",
120 "f71889fg",
121 "f81865",
122 "f81866",
123};
124
125
126static inline int superio_inb(int base, int reg);
127static inline int superio_inw(int base, int reg);
128static inline void superio_outb(int base, int reg, u8 val);
129static inline void superio_set_bit(int base, int reg, int bit);
130static inline void superio_clear_bit(int base, int reg, int bit);
131static inline int superio_enter(int base);
132static inline void superio_select(int base, int ld);
133static inline void superio_exit(int base);
134
135struct watchdog_data {
136 unsigned short sioaddr;
137 enum chips type;
138 unsigned long opened;
139 struct mutex lock;
140 char expect_close;
141 struct watchdog_info ident;
142
143 unsigned short timeout;
144 u8 timer_val;
145 char minutes_mode;
146 u8 pulse_val;
147 char pulse_mode;
148 char caused_reboot;
149};
150
151static struct watchdog_data watchdog = {
152 .lock = __MUTEX_INITIALIZER(watchdog.lock),
153};
154
155
156static inline int superio_inb(int base, int reg)
157{
158 outb(reg, base);
159 return inb(base + 1);
160}
161
162static int superio_inw(int base, int reg)
163{
164 int val;
165 val = superio_inb(base, reg) << 8;
166 val |= superio_inb(base, reg + 1);
167 return val;
168}
169
170static inline void superio_outb(int base, int reg, u8 val)
171{
172 outb(reg, base);
173 outb(val, base + 1);
174}
175
176static inline void superio_set_bit(int base, int reg, int bit)
177{
178 unsigned long val = superio_inb(base, reg);
179 __set_bit(bit, &val);
180 superio_outb(base, reg, val);
181}
182
183static inline void superio_clear_bit(int base, int reg, int bit)
184{
185 unsigned long val = superio_inb(base, reg);
186 __clear_bit(bit, &val);
187 superio_outb(base, reg, val);
188}
189
190static inline int superio_enter(int base)
191{
192
193 if (!request_muxed_region(base, 2, DRVNAME)) {
194 pr_err("I/O address 0x%04x already in use\n", (int)base);
195 return -EBUSY;
196 }
197
198
199 outb(SIO_UNLOCK_KEY, base);
200 outb(SIO_UNLOCK_KEY, base);
201
202 return 0;
203}
204
205static inline void superio_select(int base, int ld)
206{
207 outb(SIO_REG_LDSEL, base);
208 outb(ld, base + 1);
209}
210
211static inline void superio_exit(int base)
212{
213 outb(SIO_LOCK_KEY, base);
214 release_region(base, 2);
215}
216
217static int watchdog_set_timeout(int timeout)
218{
219 if (timeout <= 0
220 || timeout > max_timeout) {
221 pr_err("watchdog timeout out of range\n");
222 return -EINVAL;
223 }
224
225 mutex_lock(&watchdog.lock);
226
227 watchdog.timeout = timeout;
228 if (timeout > 0xff) {
229 watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
230 watchdog.minutes_mode = true;
231 } else {
232 watchdog.timer_val = timeout;
233 watchdog.minutes_mode = false;
234 }
235
236 mutex_unlock(&watchdog.lock);
237
238 return 0;
239}
240
241static int watchdog_set_pulse_width(unsigned int pw)
242{
243 int err = 0;
244 unsigned int t1 = 25, t2 = 125, t3 = 5000;
245
246 if (watchdog.type == f71868) {
247 t1 = 30;
248 t2 = 150;
249 t3 = 6000;
250 }
251
252 mutex_lock(&watchdog.lock);
253
254 if (pw <= 1) {
255 watchdog.pulse_val = 0;
256 } else if (pw <= t1) {
257 watchdog.pulse_val = 1;
258 } else if (pw <= t2) {
259 watchdog.pulse_val = 2;
260 } else if (pw <= t3) {
261 watchdog.pulse_val = 3;
262 } else {
263 pr_err("pulse width out of range\n");
264 err = -EINVAL;
265 goto exit_unlock;
266 }
267
268 watchdog.pulse_mode = pw;
269
270exit_unlock:
271 mutex_unlock(&watchdog.lock);
272 return err;
273}
274
275static int watchdog_keepalive(void)
276{
277 int err = 0;
278
279 mutex_lock(&watchdog.lock);
280 err = superio_enter(watchdog.sioaddr);
281 if (err)
282 goto exit_unlock;
283 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
284
285 if (watchdog.minutes_mode)
286
287 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
288 F71808FG_FLAG_WD_UNIT);
289 else
290
291 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
292 F71808FG_FLAG_WD_UNIT);
293
294
295 superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,
296 watchdog.timer_val);
297
298 superio_exit(watchdog.sioaddr);
299
300exit_unlock:
301 mutex_unlock(&watchdog.lock);
302 return err;
303}
304
305static int f71862fg_pin_configure(unsigned short ioaddr)
306{
307
308
309
310 if (f71862fg_pin == 63) {
311 if (ioaddr) {
312
313 superio_clear_bit(ioaddr, SIO_REG_ROM_ADDR_SEL, 6);
314 superio_set_bit(ioaddr, SIO_REG_MFUNCT3, 4);
315 }
316 } else if (f71862fg_pin == 56) {
317 if (ioaddr)
318 superio_set_bit(ioaddr, SIO_REG_MFUNCT1, 1);
319 } else {
320 pr_err("Invalid argument f71862fg_pin=%d\n", f71862fg_pin);
321 return -EINVAL;
322 }
323 return 0;
324}
325
326static int watchdog_start(void)
327{
328 int err;
329 u8 tmp;
330
331
332 err = watchdog_keepalive();
333 if (err)
334 return err;
335
336 mutex_lock(&watchdog.lock);
337 err = superio_enter(watchdog.sioaddr);
338 if (err)
339 goto exit_unlock;
340 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
341
342
343 switch (watchdog.type) {
344 case f71808fg:
345
346 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT2, 3);
347 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 3);
348 break;
349
350 case f71862fg:
351 err = f71862fg_pin_configure(watchdog.sioaddr);
352 if (err)
353 goto exit_superio;
354 break;
355
356 case f71868:
357 case f71869:
358
359 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 4);
360 break;
361
362 case f71882fg:
363
364 superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1);
365 break;
366
367 case f71889fg:
368
369 superio_outb(watchdog.sioaddr, SIO_REG_MFUNCT3,
370 superio_inb(watchdog.sioaddr, SIO_REG_MFUNCT3) & 0xcf);
371 break;
372
373 case f81865:
374
375 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 5);
376 break;
377
378 case f81866:
379
380
381
382
383
384
385 tmp = superio_inb(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL);
386 tmp &= ~(BIT(3) | BIT(0));
387 tmp |= BIT(2);
388 superio_outb(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL, tmp);
389
390 superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_GPIO1, 5);
391 break;
392
393 default:
394
395
396
397
398 err = -ENODEV;
399 goto exit_superio;
400 }
401
402 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
403 superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);
404
405 if (watchdog.type == f81865 || watchdog.type == f81866)
406 superio_set_bit(watchdog.sioaddr, F81865_REG_WDO_CONF,
407 F81865_FLAG_WDOUT_EN);
408 else
409 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,
410 F71808FG_FLAG_WDOUT_EN);
411
412 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
413 F71808FG_FLAG_WD_EN);
414
415 if (watchdog.pulse_mode) {
416
417 u8 wdt_conf = superio_inb(watchdog.sioaddr,
418 F71808FG_REG_WDT_CONF);
419
420
421 wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);
422
423 wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
424
425 superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
426 wdt_conf);
427 } else {
428
429 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
430 F71808FG_FLAG_WD_PULSE);
431 }
432
433exit_superio:
434 superio_exit(watchdog.sioaddr);
435exit_unlock:
436 mutex_unlock(&watchdog.lock);
437
438 return err;
439}
440
441static int watchdog_stop(void)
442{
443 int err = 0;
444
445 mutex_lock(&watchdog.lock);
446 err = superio_enter(watchdog.sioaddr);
447 if (err)
448 goto exit_unlock;
449 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
450
451 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
452 F71808FG_FLAG_WD_EN);
453
454 superio_exit(watchdog.sioaddr);
455
456exit_unlock:
457 mutex_unlock(&watchdog.lock);
458
459 return err;
460}
461
462static int watchdog_get_status(void)
463{
464 int status = 0;
465
466 mutex_lock(&watchdog.lock);
467 status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;
468 mutex_unlock(&watchdog.lock);
469
470 return status;
471}
472
473static bool watchdog_is_running(void)
474{
475
476
477
478
479 bool is_running = true;
480
481 mutex_lock(&watchdog.lock);
482 if (superio_enter(watchdog.sioaddr))
483 goto exit_unlock;
484 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
485
486 is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))
487 && (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)
488 & BIT(F71808FG_FLAG_WD_EN));
489
490 superio_exit(watchdog.sioaddr);
491
492exit_unlock:
493 mutex_unlock(&watchdog.lock);
494 return is_running;
495}
496
497
498
499static int watchdog_open(struct inode *inode, struct file *file)
500{
501 int err;
502
503
504 if (test_and_set_bit(0, &watchdog.opened))
505 return -EBUSY;
506
507 err = watchdog_start();
508 if (err) {
509 clear_bit(0, &watchdog.opened);
510 return err;
511 }
512
513 if (nowayout)
514 __module_get(THIS_MODULE);
515
516 watchdog.expect_close = 0;
517 return stream_open(inode, file);
518}
519
520static int watchdog_release(struct inode *inode, struct file *file)
521{
522 clear_bit(0, &watchdog.opened);
523
524 if (!watchdog.expect_close) {
525 watchdog_keepalive();
526 pr_crit("Unexpected close, not stopping watchdog!\n");
527 } else if (!nowayout) {
528 watchdog_stop();
529 }
530 return 0;
531}
532
533
534
535
536
537
538
539
540
541
542
543
544static ssize_t watchdog_write(struct file *file, const char __user *buf,
545 size_t count, loff_t *ppos)
546{
547 if (count) {
548 if (!nowayout) {
549 size_t i;
550
551
552 bool expect_close = false;
553
554 for (i = 0; i != count; i++) {
555 char c;
556 if (get_user(c, buf + i))
557 return -EFAULT;
558 if (c == 'V')
559 expect_close = true;
560 }
561
562
563 mutex_lock(&watchdog.lock);
564 watchdog.expect_close = expect_close;
565 mutex_unlock(&watchdog.lock);
566 }
567
568
569 watchdog_keepalive();
570 }
571 return count;
572}
573
574
575
576
577
578
579
580
581
582
583
584static long watchdog_ioctl(struct file *file, unsigned int cmd,
585 unsigned long arg)
586{
587 int status;
588 int new_options;
589 int new_timeout;
590 union {
591 struct watchdog_info __user *ident;
592 int __user *i;
593 } uarg;
594
595 uarg.i = (int __user *)arg;
596
597 switch (cmd) {
598 case WDIOC_GETSUPPORT:
599 return copy_to_user(uarg.ident, &watchdog.ident,
600 sizeof(watchdog.ident)) ? -EFAULT : 0;
601
602 case WDIOC_GETSTATUS:
603 status = watchdog_get_status();
604 if (status < 0)
605 return status;
606 return put_user(status, uarg.i);
607
608 case WDIOC_GETBOOTSTATUS:
609 return put_user(0, uarg.i);
610
611 case WDIOC_SETOPTIONS:
612 if (get_user(new_options, uarg.i))
613 return -EFAULT;
614
615 if (new_options & WDIOS_DISABLECARD)
616 watchdog_stop();
617
618 if (new_options & WDIOS_ENABLECARD)
619 return watchdog_start();
620
621
622 case WDIOC_KEEPALIVE:
623 watchdog_keepalive();
624 return 0;
625
626 case WDIOC_SETTIMEOUT:
627 if (get_user(new_timeout, uarg.i))
628 return -EFAULT;
629
630 if (watchdog_set_timeout(new_timeout))
631 return -EINVAL;
632
633 watchdog_keepalive();
634
635
636 case WDIOC_GETTIMEOUT:
637 return put_user(watchdog.timeout, uarg.i);
638
639 default:
640 return -ENOTTY;
641
642 }
643}
644
645static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
646 void *unused)
647{
648 if (code == SYS_DOWN || code == SYS_HALT)
649 watchdog_stop();
650 return NOTIFY_DONE;
651}
652
653static const struct file_operations watchdog_fops = {
654 .owner = THIS_MODULE,
655 .llseek = no_llseek,
656 .open = watchdog_open,
657 .release = watchdog_release,
658 .write = watchdog_write,
659 .unlocked_ioctl = watchdog_ioctl,
660};
661
662static struct miscdevice watchdog_miscdev = {
663 .minor = WATCHDOG_MINOR,
664 .name = "watchdog",
665 .fops = &watchdog_fops,
666};
667
668static struct notifier_block watchdog_notifier = {
669 .notifier_call = watchdog_notify_sys,
670};
671
672static int __init watchdog_init(int sioaddr)
673{
674 int wdt_conf, err = 0;
675
676
677
678
679 watchdog.sioaddr = sioaddr;
680 watchdog.ident.options = WDIOC_SETTIMEOUT
681 | WDIOF_MAGICCLOSE
682 | WDIOF_KEEPALIVEPING;
683
684 snprintf(watchdog.ident.identity,
685 sizeof(watchdog.ident.identity), "%s watchdog",
686 f71808e_names[watchdog.type]);
687
688 err = superio_enter(sioaddr);
689 if (err)
690 return err;
691 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
692
693 wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
694 watchdog.caused_reboot = wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS);
695
696 superio_exit(sioaddr);
697
698 err = watchdog_set_timeout(timeout);
699 if (err)
700 return err;
701 err = watchdog_set_pulse_width(pulse_width);
702 if (err)
703 return err;
704
705 err = register_reboot_notifier(&watchdog_notifier);
706 if (err)
707 return err;
708
709 err = misc_register(&watchdog_miscdev);
710 if (err) {
711 pr_err("cannot register miscdev on minor=%d\n",
712 watchdog_miscdev.minor);
713 goto exit_reboot;
714 }
715
716 if (start_withtimeout) {
717 if (start_withtimeout <= 0
718 || start_withtimeout > max_timeout) {
719 pr_err("starting timeout out of range\n");
720 err = -EINVAL;
721 goto exit_miscdev;
722 }
723
724 err = watchdog_start();
725 if (err) {
726 pr_err("cannot start watchdog timer\n");
727 goto exit_miscdev;
728 }
729
730 mutex_lock(&watchdog.lock);
731 err = superio_enter(sioaddr);
732 if (err)
733 goto exit_unlock;
734 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
735
736 if (start_withtimeout > 0xff) {
737
738 superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
739 F71808FG_FLAG_WD_UNIT);
740 superio_outb(sioaddr, F71808FG_REG_WD_TIME,
741 DIV_ROUND_UP(start_withtimeout, 60));
742 } else {
743
744 superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
745 F71808FG_FLAG_WD_UNIT);
746 superio_outb(sioaddr, F71808FG_REG_WD_TIME,
747 start_withtimeout);
748 }
749
750 superio_exit(sioaddr);
751 mutex_unlock(&watchdog.lock);
752
753 if (nowayout)
754 __module_get(THIS_MODULE);
755
756 pr_info("watchdog started with initial timeout of %u sec\n",
757 start_withtimeout);
758 }
759
760 return 0;
761
762exit_unlock:
763 mutex_unlock(&watchdog.lock);
764exit_miscdev:
765 misc_deregister(&watchdog_miscdev);
766exit_reboot:
767 unregister_reboot_notifier(&watchdog_notifier);
768
769 return err;
770}
771
772static int __init f71808e_find(int sioaddr)
773{
774 u16 devid;
775 int err = superio_enter(sioaddr);
776 if (err)
777 return err;
778
779 devid = superio_inw(sioaddr, SIO_REG_MANID);
780 if (devid != SIO_FINTEK_ID) {
781 pr_debug("Not a Fintek device\n");
782 err = -ENODEV;
783 goto exit;
784 }
785
786 devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
787 switch (devid) {
788 case SIO_F71808_ID:
789 watchdog.type = f71808fg;
790 break;
791 case SIO_F71862_ID:
792 watchdog.type = f71862fg;
793 err = f71862fg_pin_configure(0);
794 break;
795 case SIO_F71868_ID:
796 watchdog.type = f71868;
797 break;
798 case SIO_F71869_ID:
799 case SIO_F71869A_ID:
800 watchdog.type = f71869;
801 break;
802 case SIO_F71882_ID:
803 watchdog.type = f71882fg;
804 break;
805 case SIO_F71889_ID:
806 watchdog.type = f71889fg;
807 break;
808 case SIO_F71858_ID:
809
810 err = -ENODEV;
811 goto exit;
812 case SIO_F81865_ID:
813 watchdog.type = f81865;
814 break;
815 case SIO_F81866_ID:
816 watchdog.type = f81866;
817 break;
818 default:
819 pr_info("Unrecognized Fintek device: %04x\n",
820 (unsigned int)devid);
821 err = -ENODEV;
822 goto exit;
823 }
824
825 pr_info("Found %s watchdog chip, revision %d\n",
826 f71808e_names[watchdog.type],
827 (int)superio_inb(sioaddr, SIO_REG_DEVREV));
828exit:
829 superio_exit(sioaddr);
830 return err;
831}
832
833static int __init f71808e_init(void)
834{
835 static const unsigned short addrs[] = { 0x2e, 0x4e };
836 int err = -ENODEV;
837 int i;
838
839 for (i = 0; i < ARRAY_SIZE(addrs); i++) {
840 err = f71808e_find(addrs[i]);
841 if (err == 0)
842 break;
843 }
844 if (i == ARRAY_SIZE(addrs))
845 return err;
846
847 return watchdog_init(addrs[i]);
848}
849
850static void __exit f71808e_exit(void)
851{
852 if (watchdog_is_running()) {
853 pr_warn("Watchdog timer still running, stopping it\n");
854 watchdog_stop();
855 }
856 misc_deregister(&watchdog_miscdev);
857 unregister_reboot_notifier(&watchdog_notifier);
858}
859
860MODULE_DESCRIPTION("F71808E Watchdog Driver");
861MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
862MODULE_LICENSE("GPL");
863
864module_init(f71808e_init);
865module_exit(f71808e_exit);
866
