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1// SPDX-License-Identifier: GPL-2.0-or-later
2/***************************************************************************
3 * Copyright (C) 2006 by Hans Edgington <hans@edgington.nl> *
4 * Copyright (C) 2007-2009 Hans de Goede <hdegoede@redhat.com> *
5 * Copyright (C) 2010 Giel van Schijndel <me@mortis.eu> *
6 * *
7 ***************************************************************************/
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/err.h>
12#include <linux/init.h>
13#include <linux/io.h>
14#include <linux/ioport.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/watchdog.h>
18
19#define DRVNAME "f71808e_wdt"
20
21#define SIO_F71808FG_LD_WDT 0x07 /* Watchdog timer logical device */
22#define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */
23#define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */
24
25#define SIO_REG_LDSEL 0x07 /* Logical device select */
26#define SIO_REG_DEVID 0x20 /* Device ID (2 bytes) */
27#define SIO_REG_DEVREV 0x22 /* Device revision */
28#define SIO_REG_MANID 0x23 /* Fintek ID (2 bytes) */
29#define SIO_REG_CLOCK_SEL 0x26 /* Clock select */
30#define SIO_REG_ROM_ADDR_SEL 0x27 /* ROM address select */
31#define SIO_F81866_REG_PORT_SEL 0x27 /* F81866 Multi-Function Register */
32#define SIO_REG_TSI_LEVEL_SEL 0x28 /* TSI Level select */
33#define SIO_REG_MFUNCT1 0x29 /* Multi function select 1 */
34#define SIO_REG_MFUNCT2 0x2a /* Multi function select 2 */
35#define SIO_REG_MFUNCT3 0x2b /* Multi function select 3 */
36#define SIO_F81866_REG_GPIO1 0x2c /* F81866 GPIO1 Enable Register */
37#define SIO_REG_ENABLE 0x30 /* Logical device enable */
38#define SIO_REG_ADDR 0x60 /* Logical device address (2 bytes) */
39
40#define SIO_FINTEK_ID 0x1934 /* Manufacturers ID */
41#define SIO_F71808_ID 0x0901 /* Chipset ID */
42#define SIO_F71858_ID 0x0507 /* Chipset ID */
43#define SIO_F71862_ID 0x0601 /* Chipset ID */
44#define SIO_F71868_ID 0x1106 /* Chipset ID */
45#define SIO_F71869_ID 0x0814 /* Chipset ID */
46#define SIO_F71869A_ID 0x1007 /* Chipset ID */
47#define SIO_F71882_ID 0x0541 /* Chipset ID */
48#define SIO_F71889_ID 0x0723 /* Chipset ID */
49#define SIO_F81803_ID 0x1210 /* Chipset ID */
50#define SIO_F81865_ID 0x0704 /* Chipset ID */
51#define SIO_F81866_ID 0x1010 /* Chipset ID */
52#define SIO_F81966_ID 0x1502 /* F81804 chipset ID, same for f81966 */
53
54#define F71808FG_REG_WDO_CONF 0xf0
55#define F71808FG_REG_WDT_CONF 0xf5
56#define F71808FG_REG_WD_TIME 0xf6
57
58#define F71808FG_FLAG_WDOUT_EN 7
59
60#define F71808FG_FLAG_WDTMOUT_STS 6
61#define F71808FG_FLAG_WD_EN 5
62#define F71808FG_FLAG_WD_PULSE 4
63#define F71808FG_FLAG_WD_UNIT 3
64
65#define F81865_REG_WDO_CONF 0xfa
66#define F81865_FLAG_WDOUT_EN 0
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#define WATCHDOG_F71862FG_PIN 63 /* default watchdog reset output
74 pin number 63 */
75
76static unsigned short force_id;
77module_param(force_id, ushort, 0);
78MODULE_PARM_DESC(force_id, "Override the detected device ID");
79
80static int timeout = WATCHDOG_TIMEOUT; /* default timeout in seconds */
81module_param(timeout, int, 0);
82MODULE_PARM_DESC(timeout,
83 "Watchdog timeout in seconds. 1<= timeout <="
84 __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
85 __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
86
87static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
88module_param(pulse_width, uint, 0);
89MODULE_PARM_DESC(pulse_width,
90 "Watchdog signal pulse width. 0(=level), 1, 25, 30, 125, 150, 5000 or 6000 ms"
91 " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
92
93static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN;
94module_param(f71862fg_pin, uint, 0);
95MODULE_PARM_DESC(f71862fg_pin,
96 "Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"
97 " (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")");
98
99static bool nowayout = WATCHDOG_NOWAYOUT;
100module_param(nowayout, bool, 0444);
101MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
102
103static unsigned int start_withtimeout;
104module_param(start_withtimeout, uint, 0);
105MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
106 " given initial timeout. Zero (default) disables this feature.");
107
108enum chips { f71808fg, f71858fg, f71862fg, f71868, f71869, f71882fg, f71889fg,
109 f81803, f81865, f81866, f81966};
110
111static const char * const fintek_wdt_names[] = {
112 "f71808fg",
113 "f71858fg",
114 "f71862fg",
115 "f71868",
116 "f71869",
117 "f71882fg",
118 "f71889fg",
119 "f81803",
120 "f81865",
121 "f81866",
122 "f81966"
123};
124
125/* Super-I/O Function prototypes */
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 fintek_wdt {
136 struct watchdog_device wdd;
137 unsigned short sioaddr;
138 enum chips type;
139 struct watchdog_info ident;
140
141 u8 timer_val; /* content for the wd_time register */
142 char minutes_mode;
143 u8 pulse_val; /* pulse width flag */
144 char pulse_mode; /* enable pulse output mode? */
145};
146
147struct fintek_wdt_pdata {
148 enum chips type;
149};
150
151/* Super I/O functions */
152static inline int superio_inb(int base, int reg)
153{
154 outb(reg, base);
155 return inb(base + 1);
156}
157
158static int superio_inw(int base, int reg)
159{
160 int val;
161 val = superio_inb(base, reg) << 8;
162 val |= superio_inb(base, reg + 1);
163 return val;
164}
165
166static inline void superio_outb(int base, int reg, u8 val)
167{
168 outb(reg, base);
169 outb(val, base + 1);
170}
171
172static inline void superio_set_bit(int base, int reg, int bit)
173{
174 unsigned long val = superio_inb(base, reg);
175 __set_bit(bit, &val);
176 superio_outb(base, reg, val);
177}
178
179static inline void superio_clear_bit(int base, int reg, int bit)
180{
181 unsigned long val = superio_inb(base, reg);
182 __clear_bit(bit, &val);
183 superio_outb(base, reg, val);
184}
185
186static inline int superio_enter(int base)
187{
188 /* Don't step on other drivers' I/O space by accident */
189 if (!request_muxed_region(base, 2, DRVNAME)) {
190 pr_err("I/O address 0x%04x already in use\n", (int)base);
191 return -EBUSY;
192 }
193
194 /* according to the datasheet the key must be sent twice! */
195 outb(SIO_UNLOCK_KEY, base);
196 outb(SIO_UNLOCK_KEY, base);
197
198 return 0;
199}
200
201static inline void superio_select(int base, int ld)
202{
203 outb(SIO_REG_LDSEL, base);
204 outb(ld, base + 1);
205}
206
207static inline void superio_exit(int base)
208{
209 outb(SIO_LOCK_KEY, base);
210 release_region(base, 2);
211}
212
213static int fintek_wdt_set_timeout(struct watchdog_device *wdd, unsigned int timeout)
214{
215 struct fintek_wdt *wd = watchdog_get_drvdata(wdd);
216
217 if (timeout > 0xff) {
218 wd->timer_val = DIV_ROUND_UP(timeout, 60);
219 wd->minutes_mode = true;
220 timeout = wd->timer_val * 60;
221 } else {
222 wd->timer_val = timeout;
223 wd->minutes_mode = false;
224 }
225
226 wdd->timeout = timeout;
227
228 return 0;
229}
230
231static int fintek_wdt_set_pulse_width(struct fintek_wdt *wd, unsigned int pw)
232{
233 unsigned int t1 = 25, t2 = 125, t3 = 5000;
234
235 if (wd->type == f71868) {
236 t1 = 30;
237 t2 = 150;
238 t3 = 6000;
239 }
240
241 if (pw <= 1) {
242 wd->pulse_val = 0;
243 } else if (pw <= t1) {
244 wd->pulse_val = 1;
245 } else if (pw <= t2) {
246 wd->pulse_val = 2;
247 } else if (pw <= t3) {
248 wd->pulse_val = 3;
249 } else {
250 pr_err("pulse width out of range\n");
251 return -EINVAL;
252 }
253
254 wd->pulse_mode = pw;
255
256 return 0;
257}
258
259static int fintek_wdt_keepalive(struct watchdog_device *wdd)
260{
261 struct fintek_wdt *wd = watchdog_get_drvdata(wdd);
262 int err;
263
264 err = superio_enter(wd->sioaddr);
265 if (err)
266 return err;
267 superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
268
269 if (wd->minutes_mode)
270 /* select minutes for timer units */
271 superio_set_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
272 F71808FG_FLAG_WD_UNIT);
273 else
274 /* select seconds for timer units */
275 superio_clear_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
276 F71808FG_FLAG_WD_UNIT);
277
278 /* Set timer value */
279 superio_outb(wd->sioaddr, F71808FG_REG_WD_TIME,
280 wd->timer_val);
281
282 superio_exit(wd->sioaddr);
283
284 return 0;
285}
286
287static int fintek_wdt_start(struct watchdog_device *wdd)
288{
289 struct fintek_wdt *wd = watchdog_get_drvdata(wdd);
290 int err;
291 u8 tmp;
292
293 /* Make sure we don't die as soon as the watchdog is enabled below */
294 err = fintek_wdt_keepalive(wdd);
295 if (err)
296 return err;
297
298 err = superio_enter(wd->sioaddr);
299 if (err)
300 return err;
301 superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
302
303 /* Watchdog pin configuration */
304 switch (wd->type) {
305 case f71808fg:
306 /* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */
307 superio_clear_bit(wd->sioaddr, SIO_REG_MFUNCT2, 3);
308 superio_clear_bit(wd->sioaddr, SIO_REG_MFUNCT3, 3);
309 break;
310
311 case f71862fg:
312 if (f71862fg_pin == 63) {
313 /* SPI must be disabled first to use this pin! */
314 superio_clear_bit(wd->sioaddr, SIO_REG_ROM_ADDR_SEL, 6);
315 superio_set_bit(wd->sioaddr, SIO_REG_MFUNCT3, 4);
316 } else if (f71862fg_pin == 56) {
317 superio_set_bit(wd->sioaddr, SIO_REG_MFUNCT1, 1);
318 }
319 break;
320
321 case f71868:
322 case f71869:
323 /* GPIO14 --> WDTRST# */
324 superio_clear_bit(wd->sioaddr, SIO_REG_MFUNCT1, 4);
325 break;
326
327 case f71882fg:
328 /* Set pin 56 to WDTRST# */
329 superio_set_bit(wd->sioaddr, SIO_REG_MFUNCT1, 1);
330 break;
331
332 case f71889fg:
333 /* set pin 40 to WDTRST# */
334 superio_outb(wd->sioaddr, SIO_REG_MFUNCT3,
335 superio_inb(wd->sioaddr, SIO_REG_MFUNCT3) & 0xcf);
336 break;
337
338 case f81803:
339 /* Enable TSI Level register bank */
340 superio_clear_bit(wd->sioaddr, SIO_REG_CLOCK_SEL, 3);
341 /* Set pin 27 to WDTRST# */
342 superio_outb(wd->sioaddr, SIO_REG_TSI_LEVEL_SEL, 0x5f &
343 superio_inb(wd->sioaddr, SIO_REG_TSI_LEVEL_SEL));
344 break;
345
346 case f81865:
347 /* Set pin 70 to WDTRST# */
348 superio_clear_bit(wd->sioaddr, SIO_REG_MFUNCT3, 5);
349 break;
350
351 case f81866:
352 case f81966:
353 /*
354 * GPIO1 Control Register when 27h BIT3:2 = 01 & BIT0 = 0.
355 * The PIN 70(GPIO15/WDTRST) is controlled by 2Ch:
356 * BIT5: 0 -> WDTRST#
357 * 1 -> GPIO15
358 */
359 tmp = superio_inb(wd->sioaddr, SIO_F81866_REG_PORT_SEL);
360 tmp &= ~(BIT(3) | BIT(0));
361 tmp |= BIT(2);
362 superio_outb(wd->sioaddr, SIO_F81866_REG_PORT_SEL, tmp);
363
364 superio_clear_bit(wd->sioaddr, SIO_F81866_REG_GPIO1, 5);
365 break;
366
367 default:
368 /*
369 * 'default' label to shut up the compiler and catch
370 * programmer errors
371 */
372 err = -ENODEV;
373 goto exit_superio;
374 }
375
376 superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
377 superio_set_bit(wd->sioaddr, SIO_REG_ENABLE, 0);
378
379 if (wd->type == f81865 || wd->type == f81866 || wd->type == f81966)
380 superio_set_bit(wd->sioaddr, F81865_REG_WDO_CONF,
381 F81865_FLAG_WDOUT_EN);
382 else
383 superio_set_bit(wd->sioaddr, F71808FG_REG_WDO_CONF,
384 F71808FG_FLAG_WDOUT_EN);
385
386 superio_set_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
387 F71808FG_FLAG_WD_EN);
388
389 if (wd->pulse_mode) {
390 /* Select "pulse" output mode with given duration */
391 u8 wdt_conf = superio_inb(wd->sioaddr,
392 F71808FG_REG_WDT_CONF);
393
394 /* Set WD_PSWIDTH bits (1:0) */
395 wdt_conf = (wdt_conf & 0xfc) | (wd->pulse_val & 0x03);
396 /* Set WD_PULSE to "pulse" mode */
397 wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
398
399 superio_outb(wd->sioaddr, F71808FG_REG_WDT_CONF,
400 wdt_conf);
401 } else {
402 /* Select "level" output mode */
403 superio_clear_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
404 F71808FG_FLAG_WD_PULSE);
405 }
406
407exit_superio:
408 superio_exit(wd->sioaddr);
409
410 return err;
411}
412
413static int fintek_wdt_stop(struct watchdog_device *wdd)
414{
415 struct fintek_wdt *wd = watchdog_get_drvdata(wdd);
416 int err;
417
418 err = superio_enter(wd->sioaddr);
419 if (err)
420 return err;
421 superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
422
423 superio_clear_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
424 F71808FG_FLAG_WD_EN);
425
426 superio_exit(wd->sioaddr);
427
428 return 0;
429}
430
431static bool fintek_wdt_is_running(struct fintek_wdt *wd, u8 wdt_conf)
432{
433 return (superio_inb(wd->sioaddr, SIO_REG_ENABLE) & BIT(0))
434 && (wdt_conf & BIT(F71808FG_FLAG_WD_EN));
435}
436
437static const struct watchdog_ops fintek_wdt_ops = {
438 .owner = THIS_MODULE,
439 .start = fintek_wdt_start,
440 .stop = fintek_wdt_stop,
441 .ping = fintek_wdt_keepalive,
442 .set_timeout = fintek_wdt_set_timeout,
443};
444
445static int fintek_wdt_probe(struct platform_device *pdev)
446{
447 struct device *dev = &pdev->dev;
448 struct fintek_wdt_pdata *pdata;
449 struct watchdog_device *wdd;
450 struct fintek_wdt *wd;
451 int wdt_conf, err = 0;
452 struct resource *res;
453 int sioaddr;
454
455 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
456 if (!res)
457 return -ENXIO;
458
459 sioaddr = res->start;
460
461 wd = devm_kzalloc(dev, sizeof(*wd), GFP_KERNEL);
462 if (!wd)
463 return -ENOMEM;
464
465 pdata = dev->platform_data;
466
467 wd->type = pdata->type;
468 wd->sioaddr = sioaddr;
469 wd->ident.options = WDIOF_SETTIMEOUT
470 | WDIOF_MAGICCLOSE
471 | WDIOF_KEEPALIVEPING
472 | WDIOF_CARDRESET;
473
474 snprintf(wd->ident.identity,
475 sizeof(wd->ident.identity), "%s watchdog",
476 fintek_wdt_names[wd->type]);
477
478 err = superio_enter(sioaddr);
479 if (err)
480 return err;
481 superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
482
483 wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
484
485 /*
486 * We don't want WDTMOUT_STS to stick around till regular reboot.
487 * Write 1 to the bit to clear it to zero.
488 */
489 superio_outb(sioaddr, F71808FG_REG_WDT_CONF,
490 wdt_conf | BIT(F71808FG_FLAG_WDTMOUT_STS));
491
492 wdd = &wd->wdd;
493
494 if (fintek_wdt_is_running(wd, wdt_conf))
495 set_bit(WDOG_HW_RUNNING, &wdd->status);
496
497 superio_exit(sioaddr);
498
499 wdd->parent = dev;
500 wdd->info = &wd->ident;
501 wdd->ops = &fintek_wdt_ops;
502 wdd->min_timeout = 1;
503 wdd->max_timeout = WATCHDOG_MAX_TIMEOUT;
504
505 watchdog_set_drvdata(wdd, wd);
506 watchdog_set_nowayout(wdd, nowayout);
507 watchdog_stop_on_unregister(wdd);
508 watchdog_stop_on_reboot(wdd);
509 watchdog_init_timeout(wdd, start_withtimeout ?: timeout, NULL);
510
511 if (wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS))
512 wdd->bootstatus = WDIOF_CARDRESET;
513
514 /*
515 * WATCHDOG_HANDLE_BOOT_ENABLED can result in keepalive being directly
516 * called without a set_timeout before, so it needs to be done here
517 * unconditionally.
518 */
519 fintek_wdt_set_timeout(wdd, wdd->timeout);
520 fintek_wdt_set_pulse_width(wd, pulse_width);
521
522 if (start_withtimeout) {
523 err = fintek_wdt_start(wdd);
524 if (err) {
525 dev_err(dev, "cannot start watchdog timer\n");
526 return err;
527 }
528
529 set_bit(WDOG_HW_RUNNING, &wdd->status);
530 dev_info(dev, "watchdog started with initial timeout of %u sec\n",
531 start_withtimeout);
532 }
533
534 return devm_watchdog_register_device(dev, wdd);
535}
536
537static int __init fintek_wdt_find(int sioaddr)
538{
539 enum chips type;
540 u16 devid;
541 int err = superio_enter(sioaddr);
542 if (err)
543 return err;
544
545 devid = superio_inw(sioaddr, SIO_REG_MANID);
546 if (devid != SIO_FINTEK_ID) {
547 pr_debug("Not a Fintek device\n");
548 err = -ENODEV;
549 goto exit;
550 }
551
552 devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
553 switch (devid) {
554 case SIO_F71808_ID:
555 type = f71808fg;
556 break;
557 case SIO_F71862_ID:
558 type = f71862fg;
559 break;
560 case SIO_F71868_ID:
561 type = f71868;
562 break;
563 case SIO_F71869_ID:
564 case SIO_F71869A_ID:
565 type = f71869;
566 break;
567 case SIO_F71882_ID:
568 type = f71882fg;
569 break;
570 case SIO_F71889_ID:
571 type = f71889fg;
572 break;
573 case SIO_F71858_ID:
574 /* Confirmed (by datasheet) not to have a watchdog. */
575 err = -ENODEV;
576 goto exit;
577 case SIO_F81803_ID:
578 type = f81803;
579 break;
580 case SIO_F81865_ID:
581 type = f81865;
582 break;
583 case SIO_F81866_ID:
584 type = f81866;
585 break;
586 case SIO_F81966_ID:
587 type = f81966;
588 break;
589 default:
590 pr_info("Unrecognized Fintek device: %04x\n",
591 (unsigned int)devid);
592 err = -ENODEV;
593 goto exit;
594 }
595
596 pr_info("Found %s watchdog chip, revision %d\n",
597 fintek_wdt_names[type],
598 (int)superio_inb(sioaddr, SIO_REG_DEVREV));
599
600exit:
601 superio_exit(sioaddr);
602 return err ? err : type;
603}
604
605static struct platform_driver fintek_wdt_driver = {
606 .probe = fintek_wdt_probe,
607 .driver = {
608 .name = DRVNAME,
609 },
610};
611
612static struct platform_device *fintek_wdt_pdev;
613
614static int __init fintek_wdt_init(void)
615{
616 static const unsigned short addrs[] = { 0x2e, 0x4e };
617 struct fintek_wdt_pdata pdata;
618 struct resource wdt_res = {};
619 int ret;
620 int i;
621
622 if (f71862fg_pin != 63 && f71862fg_pin != 56) {
623 pr_err("Invalid argument f71862fg_pin=%d\n", f71862fg_pin);
624 return -EINVAL;
625 }
626
627 for (i = 0; i < ARRAY_SIZE(addrs); i++) {
628 ret = fintek_wdt_find(addrs[i]);
629 if (ret >= 0)
630 break;
631 }
632 if (i == ARRAY_SIZE(addrs))
633 return ret;
634
635 pdata.type = ret;
636
637 ret = platform_driver_register(&fintek_wdt_driver);
638 if (ret)
639 return ret;
640
641 wdt_res.name = "superio port";
642 wdt_res.flags = IORESOURCE_IO;
643 wdt_res.start = addrs[i];
644 wdt_res.end = addrs[i] + 1;
645
646 fintek_wdt_pdev = platform_device_register_resndata(NULL, DRVNAME, -1,
647 &wdt_res, 1,
648 &pdata, sizeof(pdata));
649 if (IS_ERR(fintek_wdt_pdev)) {
650 platform_driver_unregister(&fintek_wdt_driver);
651 return PTR_ERR(fintek_wdt_pdev);
652 }
653
654 return 0;
655}
656
657static void __exit fintek_wdt_exit(void)
658{
659 platform_device_unregister(fintek_wdt_pdev);
660 platform_driver_unregister(&fintek_wdt_driver);
661}
662
663MODULE_DESCRIPTION("F71808E Watchdog Driver");
664MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
665MODULE_LICENSE("GPL");
666
667module_init(fintek_wdt_init);
668module_exit(fintek_wdt_exit);
1/***************************************************************************
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_ROM_ADDR_SEL 0x27 /* ROM address select */
46#define SIO_REG_MFUNCT1 0x29 /* Multi function select 1 */
47#define SIO_REG_MFUNCT2 0x2a /* Multi function select 2 */
48#define SIO_REG_MFUNCT3 0x2b /* Multi function select 3 */
49#define SIO_REG_ENABLE 0x30 /* Logical device enable */
50#define SIO_REG_ADDR 0x60 /* Logical device address (2 bytes) */
51
52#define SIO_FINTEK_ID 0x1934 /* Manufacturers ID */
53#define SIO_F71808_ID 0x0901 /* Chipset ID */
54#define SIO_F71858_ID 0x0507 /* Chipset ID */
55#define SIO_F71862_ID 0x0601 /* Chipset ID */
56#define SIO_F71869_ID 0x0814 /* Chipset ID */
57#define SIO_F71882_ID 0x0541 /* Chipset ID */
58#define SIO_F71889_ID 0x0723 /* Chipset ID */
59
60#define F71808FG_REG_WDO_CONF 0xf0
61#define F71808FG_REG_WDT_CONF 0xf5
62#define F71808FG_REG_WD_TIME 0xf6
63
64#define F71808FG_FLAG_WDOUT_EN 7
65
66#define F71808FG_FLAG_WDTMOUT_STS 5
67#define F71808FG_FLAG_WD_EN 5
68#define F71808FG_FLAG_WD_PULSE 4
69#define F71808FG_FLAG_WD_UNIT 3
70
71/* Default values */
72#define WATCHDOG_TIMEOUT 60 /* 1 minute default timeout */
73#define WATCHDOG_MAX_TIMEOUT (60 * 255)
74#define WATCHDOG_PULSE_WIDTH 125 /* 125 ms, default pulse width for
75 watchdog signal */
76#define WATCHDOG_F71862FG_PIN 63 /* default watchdog reset output
77 pin number 63 */
78
79static unsigned short force_id;
80module_param(force_id, ushort, 0);
81MODULE_PARM_DESC(force_id, "Override the detected device ID");
82
83static const int max_timeout = WATCHDOG_MAX_TIMEOUT;
84static int timeout = WATCHDOG_TIMEOUT; /* default timeout in seconds */
85module_param(timeout, int, 0);
86MODULE_PARM_DESC(timeout,
87 "Watchdog timeout in seconds. 1<= timeout <="
88 __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
89 __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
90
91static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
92module_param(pulse_width, uint, 0);
93MODULE_PARM_DESC(pulse_width,
94 "Watchdog signal pulse width. 0(=level), 1 ms, 25 ms, 125 ms or 5000 ms"
95 " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
96
97static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN;
98module_param(f71862fg_pin, uint, 0);
99MODULE_PARM_DESC(f71862fg_pin,
100 "Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"
101 " (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")");
102
103static int nowayout = WATCHDOG_NOWAYOUT;
104module_param(nowayout, bool, 0444);
105MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
106
107static unsigned int start_withtimeout;
108module_param(start_withtimeout, uint, 0);
109MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
110 " given initial timeout. Zero (default) disables this feature.");
111
112enum chips { f71808fg, f71858fg, f71862fg, f71869, f71882fg, f71889fg };
113
114static const char *f71808e_names[] = {
115 "f71808fg",
116 "f71858fg",
117 "f71862fg",
118 "f71869",
119 "f71882fg",
120 "f71889fg",
121};
122
123/* Super-I/O Function prototypes */
124static inline int superio_inb(int base, int reg);
125static inline int superio_inw(int base, int reg);
126static inline void superio_outb(int base, int reg, u8 val);
127static inline void superio_set_bit(int base, int reg, int bit);
128static inline void superio_clear_bit(int base, int reg, int bit);
129static inline int superio_enter(int base);
130static inline void superio_select(int base, int ld);
131static inline void superio_exit(int base);
132
133struct watchdog_data {
134 unsigned short sioaddr;
135 enum chips type;
136 unsigned long opened;
137 struct mutex lock;
138 char expect_close;
139 struct watchdog_info ident;
140
141 unsigned short timeout;
142 u8 timer_val; /* content for the wd_time register */
143 char minutes_mode;
144 u8 pulse_val; /* pulse width flag */
145 char pulse_mode; /* enable pulse output mode? */
146 char caused_reboot; /* last reboot was by the watchdog */
147};
148
149static struct watchdog_data watchdog = {
150 .lock = __MUTEX_INITIALIZER(watchdog.lock),
151};
152
153/* Super I/O functions */
154static inline int superio_inb(int base, int reg)
155{
156 outb(reg, base);
157 return inb(base + 1);
158}
159
160static int superio_inw(int base, int reg)
161{
162 int val;
163 val = superio_inb(base, reg) << 8;
164 val |= superio_inb(base, reg + 1);
165 return val;
166}
167
168static inline void superio_outb(int base, int reg, u8 val)
169{
170 outb(reg, base);
171 outb(val, base + 1);
172}
173
174static inline void superio_set_bit(int base, int reg, int bit)
175{
176 unsigned long val = superio_inb(base, reg);
177 __set_bit(bit, &val);
178 superio_outb(base, reg, val);
179}
180
181static inline void superio_clear_bit(int base, int reg, int bit)
182{
183 unsigned long val = superio_inb(base, reg);
184 __clear_bit(bit, &val);
185 superio_outb(base, reg, val);
186}
187
188static inline int superio_enter(int base)
189{
190 /* Don't step on other drivers' I/O space by accident */
191 if (!request_muxed_region(base, 2, DRVNAME)) {
192 printk(KERN_ERR DRVNAME ": I/O address 0x%04x already in use\n",
193 (int)base);
194 return -EBUSY;
195 }
196
197 /* according to the datasheet the key must be send twice! */
198 outb(SIO_UNLOCK_KEY, base);
199 outb(SIO_UNLOCK_KEY, base);
200
201 return 0;
202}
203
204static inline void superio_select(int base, int ld)
205{
206 outb(SIO_REG_LDSEL, base);
207 outb(ld, base + 1);
208}
209
210static inline void superio_exit(int base)
211{
212 outb(SIO_LOCK_KEY, base);
213 release_region(base, 2);
214}
215
216static int watchdog_set_timeout(int timeout)
217{
218 if (timeout <= 0
219 || timeout > max_timeout) {
220 printk(KERN_ERR DRVNAME ": watchdog timeout out of range\n");
221 return -EINVAL;
222 }
223
224 mutex_lock(&watchdog.lock);
225
226 watchdog.timeout = timeout;
227 if (timeout > 0xff) {
228 watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
229 watchdog.minutes_mode = true;
230 } else {
231 watchdog.timer_val = timeout;
232 watchdog.minutes_mode = false;
233 }
234
235 mutex_unlock(&watchdog.lock);
236
237 return 0;
238}
239
240static int watchdog_set_pulse_width(unsigned int pw)
241{
242 int err = 0;
243
244 mutex_lock(&watchdog.lock);
245
246 if (pw <= 1) {
247 watchdog.pulse_val = 0;
248 } else if (pw <= 25) {
249 watchdog.pulse_val = 1;
250 } else if (pw <= 125) {
251 watchdog.pulse_val = 2;
252 } else if (pw <= 5000) {
253 watchdog.pulse_val = 3;
254 } else {
255 printk(KERN_ERR DRVNAME ": pulse width out of range\n");
256 err = -EINVAL;
257 goto exit_unlock;
258 }
259
260 watchdog.pulse_mode = pw;
261
262exit_unlock:
263 mutex_unlock(&watchdog.lock);
264 return err;
265}
266
267static int watchdog_keepalive(void)
268{
269 int err = 0;
270
271 mutex_lock(&watchdog.lock);
272 err = superio_enter(watchdog.sioaddr);
273 if (err)
274 goto exit_unlock;
275 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
276
277 if (watchdog.minutes_mode)
278 /* select minutes for timer units */
279 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
280 F71808FG_FLAG_WD_UNIT);
281 else
282 /* select seconds for timer units */
283 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
284 F71808FG_FLAG_WD_UNIT);
285
286 /* Set timer value */
287 superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,
288 watchdog.timer_val);
289
290 superio_exit(watchdog.sioaddr);
291
292exit_unlock:
293 mutex_unlock(&watchdog.lock);
294 return err;
295}
296
297static int f71862fg_pin_configure(unsigned short ioaddr)
298{
299 /* When ioaddr is non-zero the calling function has to take care of
300 mutex handling and superio preparation! */
301
302 if (f71862fg_pin == 63) {
303 if (ioaddr) {
304 /* SPI must be disabled first to use this pin! */
305 superio_clear_bit(ioaddr, SIO_REG_ROM_ADDR_SEL, 6);
306 superio_set_bit(ioaddr, SIO_REG_MFUNCT3, 4);
307 }
308 } else if (f71862fg_pin == 56) {
309 if (ioaddr)
310 superio_set_bit(ioaddr, SIO_REG_MFUNCT1, 1);
311 } else {
312 printk(KERN_ERR DRVNAME ": Invalid argument f71862fg_pin=%d\n",
313 f71862fg_pin);
314 return -EINVAL;
315 }
316 return 0;
317}
318
319static int watchdog_start(void)
320{
321 /* Make sure we don't die as soon as the watchdog is enabled below */
322 int err = watchdog_keepalive();
323 if (err)
324 return err;
325
326 mutex_lock(&watchdog.lock);
327 err = superio_enter(watchdog.sioaddr);
328 if (err)
329 goto exit_unlock;
330 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
331
332 /* Watchdog pin configuration */
333 switch (watchdog.type) {
334 case f71808fg:
335 /* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */
336 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT2, 3);
337 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 3);
338 break;
339
340 case f71862fg:
341 err = f71862fg_pin_configure(watchdog.sioaddr);
342 if (err)
343 goto exit_superio;
344 break;
345
346 case f71869:
347 /* GPIO14 --> WDTRST# */
348 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 4);
349 break;
350
351 case f71882fg:
352 /* Set pin 56 to WDTRST# */
353 superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1);
354 break;
355
356 case f71889fg:
357 /* set pin 40 to WDTRST# */
358 superio_outb(watchdog.sioaddr, SIO_REG_MFUNCT3,
359 superio_inb(watchdog.sioaddr, SIO_REG_MFUNCT3) & 0xcf);
360 break;
361
362 default:
363 /*
364 * 'default' label to shut up the compiler and catch
365 * programmer errors
366 */
367 err = -ENODEV;
368 goto exit_superio;
369 }
370
371 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
372 superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);
373 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,
374 F71808FG_FLAG_WDOUT_EN);
375
376 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
377 F71808FG_FLAG_WD_EN);
378
379 if (watchdog.pulse_mode) {
380 /* Select "pulse" output mode with given duration */
381 u8 wdt_conf = superio_inb(watchdog.sioaddr,
382 F71808FG_REG_WDT_CONF);
383
384 /* Set WD_PSWIDTH bits (1:0) */
385 wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);
386 /* Set WD_PULSE to "pulse" mode */
387 wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
388
389 superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
390 wdt_conf);
391 } else {
392 /* Select "level" output mode */
393 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
394 F71808FG_FLAG_WD_PULSE);
395 }
396
397exit_superio:
398 superio_exit(watchdog.sioaddr);
399exit_unlock:
400 mutex_unlock(&watchdog.lock);
401
402 return err;
403}
404
405static int watchdog_stop(void)
406{
407 int err = 0;
408
409 mutex_lock(&watchdog.lock);
410 err = superio_enter(watchdog.sioaddr);
411 if (err)
412 goto exit_unlock;
413 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
414
415 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
416 F71808FG_FLAG_WD_EN);
417
418 superio_exit(watchdog.sioaddr);
419
420exit_unlock:
421 mutex_unlock(&watchdog.lock);
422
423 return err;
424}
425
426static int watchdog_get_status(void)
427{
428 int status = 0;
429
430 mutex_lock(&watchdog.lock);
431 status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;
432 mutex_unlock(&watchdog.lock);
433
434 return status;
435}
436
437static bool watchdog_is_running(void)
438{
439 /*
440 * if we fail to determine the watchdog's status assume it to be
441 * running to be on the safe side
442 */
443 bool is_running = true;
444
445 mutex_lock(&watchdog.lock);
446 if (superio_enter(watchdog.sioaddr))
447 goto exit_unlock;
448 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
449
450 is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))
451 && (superio_inb(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 return is_running;
459}
460
461/* /dev/watchdog api */
462
463static int watchdog_open(struct inode *inode, struct file *file)
464{
465 int err;
466
467 /* If the watchdog is alive we don't need to start it again */
468 if (test_and_set_bit(0, &watchdog.opened))
469 return -EBUSY;
470
471 err = watchdog_start();
472 if (err) {
473 clear_bit(0, &watchdog.opened);
474 return err;
475 }
476
477 if (nowayout)
478 __module_get(THIS_MODULE);
479
480 watchdog.expect_close = 0;
481 return nonseekable_open(inode, file);
482}
483
484static int watchdog_release(struct inode *inode, struct file *file)
485{
486 clear_bit(0, &watchdog.opened);
487
488 if (!watchdog.expect_close) {
489 watchdog_keepalive();
490 printk(KERN_CRIT DRVNAME
491 ": Unexpected close, not stopping watchdog!\n");
492 } else if (!nowayout) {
493 watchdog_stop();
494 }
495 return 0;
496}
497
498/*
499 * watchdog_write:
500 * @file: file handle to the watchdog
501 * @buf: buffer to write
502 * @count: count of bytes
503 * @ppos: pointer to the position to write. No seeks allowed
504 *
505 * A write to a watchdog device is defined as a keepalive signal. Any
506 * write of data will do, as we we don't define content meaning.
507 */
508
509static ssize_t watchdog_write(struct file *file, const char __user *buf,
510 size_t count, loff_t *ppos)
511{
512 if (count) {
513 if (!nowayout) {
514 size_t i;
515
516 /* In case it was set long ago */
517 bool expect_close = false;
518
519 for (i = 0; i != count; i++) {
520 char c;
521 if (get_user(c, buf + i))
522 return -EFAULT;
523 expect_close = (c == 'V');
524 }
525
526 /* Properly order writes across fork()ed processes */
527 mutex_lock(&watchdog.lock);
528 watchdog.expect_close = expect_close;
529 mutex_unlock(&watchdog.lock);
530 }
531
532 /* someone wrote to us, we should restart timer */
533 watchdog_keepalive();
534 }
535 return count;
536}
537
538/*
539 * watchdog_ioctl:
540 * @inode: inode of the device
541 * @file: file handle to the device
542 * @cmd: watchdog command
543 * @arg: argument pointer
544 *
545 * The watchdog API defines a common set of functions for all watchdogs
546 * according to their available features.
547 */
548static long watchdog_ioctl(struct file *file, unsigned int cmd,
549 unsigned long arg)
550{
551 int status;
552 int new_options;
553 int new_timeout;
554 union {
555 struct watchdog_info __user *ident;
556 int __user *i;
557 } uarg;
558
559 uarg.i = (int __user *)arg;
560
561 switch (cmd) {
562 case WDIOC_GETSUPPORT:
563 return copy_to_user(uarg.ident, &watchdog.ident,
564 sizeof(watchdog.ident)) ? -EFAULT : 0;
565
566 case WDIOC_GETSTATUS:
567 status = watchdog_get_status();
568 if (status < 0)
569 return status;
570 return put_user(status, uarg.i);
571
572 case WDIOC_GETBOOTSTATUS:
573 return put_user(0, uarg.i);
574
575 case WDIOC_SETOPTIONS:
576 if (get_user(new_options, uarg.i))
577 return -EFAULT;
578
579 if (new_options & WDIOS_DISABLECARD)
580 watchdog_stop();
581
582 if (new_options & WDIOS_ENABLECARD)
583 return watchdog_start();
584
585
586 case WDIOC_KEEPALIVE:
587 watchdog_keepalive();
588 return 0;
589
590 case WDIOC_SETTIMEOUT:
591 if (get_user(new_timeout, uarg.i))
592 return -EFAULT;
593
594 if (watchdog_set_timeout(new_timeout))
595 return -EINVAL;
596
597 watchdog_keepalive();
598 /* Fall */
599
600 case WDIOC_GETTIMEOUT:
601 return put_user(watchdog.timeout, uarg.i);
602
603 default:
604 return -ENOTTY;
605
606 }
607}
608
609static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
610 void *unused)
611{
612 if (code == SYS_DOWN || code == SYS_HALT)
613 watchdog_stop();
614 return NOTIFY_DONE;
615}
616
617static const struct file_operations watchdog_fops = {
618 .owner = THIS_MODULE,
619 .llseek = no_llseek,
620 .open = watchdog_open,
621 .release = watchdog_release,
622 .write = watchdog_write,
623 .unlocked_ioctl = watchdog_ioctl,
624};
625
626static struct miscdevice watchdog_miscdev = {
627 .minor = WATCHDOG_MINOR,
628 .name = "watchdog",
629 .fops = &watchdog_fops,
630};
631
632static struct notifier_block watchdog_notifier = {
633 .notifier_call = watchdog_notify_sys,
634};
635
636static int __init watchdog_init(int sioaddr)
637{
638 int wdt_conf, err = 0;
639
640 /* No need to lock watchdog.lock here because no entry points
641 * into the module have been registered yet.
642 */
643 watchdog.sioaddr = sioaddr;
644 watchdog.ident.options = WDIOC_SETTIMEOUT
645 | WDIOF_MAGICCLOSE
646 | WDIOF_KEEPALIVEPING;
647
648 snprintf(watchdog.ident.identity,
649 sizeof(watchdog.ident.identity), "%s watchdog",
650 f71808e_names[watchdog.type]);
651
652 err = superio_enter(sioaddr);
653 if (err)
654 return err;
655 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
656
657 wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
658 watchdog.caused_reboot = wdt_conf & F71808FG_FLAG_WDTMOUT_STS;
659
660 superio_exit(sioaddr);
661
662 err = watchdog_set_timeout(timeout);
663 if (err)
664 return err;
665 err = watchdog_set_pulse_width(pulse_width);
666 if (err)
667 return err;
668
669 err = register_reboot_notifier(&watchdog_notifier);
670 if (err)
671 return err;
672
673 err = misc_register(&watchdog_miscdev);
674 if (err) {
675 printk(KERN_ERR DRVNAME
676 ": cannot register miscdev on minor=%d\n",
677 watchdog_miscdev.minor);
678 goto exit_reboot;
679 }
680
681 if (start_withtimeout) {
682 if (start_withtimeout <= 0
683 || start_withtimeout > max_timeout) {
684 printk(KERN_ERR DRVNAME
685 ": starting timeout out of range\n");
686 err = -EINVAL;
687 goto exit_miscdev;
688 }
689
690 err = watchdog_start();
691 if (err) {
692 printk(KERN_ERR DRVNAME
693 ": cannot start watchdog timer\n");
694 goto exit_miscdev;
695 }
696
697 mutex_lock(&watchdog.lock);
698 err = superio_enter(sioaddr);
699 if (err)
700 goto exit_unlock;
701 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
702
703 if (start_withtimeout > 0xff) {
704 /* select minutes for timer units */
705 superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
706 F71808FG_FLAG_WD_UNIT);
707 superio_outb(sioaddr, F71808FG_REG_WD_TIME,
708 DIV_ROUND_UP(start_withtimeout, 60));
709 } else {
710 /* select seconds for timer units */
711 superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
712 F71808FG_FLAG_WD_UNIT);
713 superio_outb(sioaddr, F71808FG_REG_WD_TIME,
714 start_withtimeout);
715 }
716
717 superio_exit(sioaddr);
718 mutex_unlock(&watchdog.lock);
719
720 if (nowayout)
721 __module_get(THIS_MODULE);
722
723 printk(KERN_INFO DRVNAME
724 ": watchdog started with initial timeout of %u sec\n",
725 start_withtimeout);
726 }
727
728 return 0;
729
730exit_unlock:
731 mutex_unlock(&watchdog.lock);
732exit_miscdev:
733 misc_deregister(&watchdog_miscdev);
734exit_reboot:
735 unregister_reboot_notifier(&watchdog_notifier);
736
737 return err;
738}
739
740static int __init f71808e_find(int sioaddr)
741{
742 u16 devid;
743 int err = superio_enter(sioaddr);
744 if (err)
745 return err;
746
747 devid = superio_inw(sioaddr, SIO_REG_MANID);
748 if (devid != SIO_FINTEK_ID) {
749 pr_debug(DRVNAME ": Not a Fintek device\n");
750 err = -ENODEV;
751 goto exit;
752 }
753
754 devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
755 switch (devid) {
756 case SIO_F71808_ID:
757 watchdog.type = f71808fg;
758 break;
759 case SIO_F71862_ID:
760 watchdog.type = f71862fg;
761 err = f71862fg_pin_configure(0); /* validate module parameter */
762 break;
763 case SIO_F71869_ID:
764 watchdog.type = f71869;
765 break;
766 case SIO_F71882_ID:
767 watchdog.type = f71882fg;
768 break;
769 case SIO_F71889_ID:
770 watchdog.type = f71889fg;
771 break;
772 case SIO_F71858_ID:
773 /* Confirmed (by datasheet) not to have a watchdog. */
774 err = -ENODEV;
775 goto exit;
776 default:
777 printk(KERN_INFO DRVNAME ": Unrecognized Fintek device: %04x\n",
778 (unsigned int)devid);
779 err = -ENODEV;
780 goto exit;
781 }
782
783 printk(KERN_INFO DRVNAME ": Found %s watchdog chip, revision %d\n",
784 f71808e_names[watchdog.type],
785 (int)superio_inb(sioaddr, SIO_REG_DEVREV));
786exit:
787 superio_exit(sioaddr);
788 return err;
789}
790
791static int __init f71808e_init(void)
792{
793 static const unsigned short addrs[] = { 0x2e, 0x4e };
794 int err = -ENODEV;
795 int i;
796
797 for (i = 0; i < ARRAY_SIZE(addrs); i++) {
798 err = f71808e_find(addrs[i]);
799 if (err == 0)
800 break;
801 }
802 if (i == ARRAY_SIZE(addrs))
803 return err;
804
805 return watchdog_init(addrs[i]);
806}
807
808static void __exit f71808e_exit(void)
809{
810 if (watchdog_is_running()) {
811 printk(KERN_WARNING DRVNAME
812 ": Watchdog timer still running, stopping it\n");
813 watchdog_stop();
814 }
815 misc_deregister(&watchdog_miscdev);
816 unregister_reboot_notifier(&watchdog_notifier);
817}
818
819MODULE_DESCRIPTION("F71808E Watchdog Driver");
820MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
821MODULE_LICENSE("GPL");
822
823module_init(f71808e_init);
824module_exit(f71808e_exit);