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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_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 | ||
74 | static unsigned short force_id; | |
75 | module_param(force_id, ushort, 0); | |
76 | MODULE_PARM_DESC(force_id, "Override the detected device ID"); | |
77 | ||
78 | static const int max_timeout = WATCHDOG_MAX_TIMEOUT; | |
79 | static int timeout = 60; /* default timeout in seconds */ | |
80 | module_param(timeout, int, 0); | |
81 | MODULE_PARM_DESC(timeout, | |
82 | "Watchdog timeout in seconds. 1<= timeout <=" | |
83 | __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default=" | |
84 | __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); | |
85 | ||
86 | static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH; | |
87 | module_param(pulse_width, uint, 0); | |
88 | MODULE_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 | ||
92 | static int nowayout = WATCHDOG_NOWAYOUT; | |
93 | module_param(nowayout, bool, 0444); | |
94 | MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close"); | |
95 | ||
96 | static unsigned int start_withtimeout; | |
97 | module_param(start_withtimeout, uint, 0); | |
98 | MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with" | |
99 | " given initial timeout. Zero (default) disables this feature."); | |
100 | ||
101 | enum chips { f71808fg, f71858fg, f71862fg, f71882fg, f71889fg }; | |
102 | ||
103 | static const char *f71808e_names[] = { | |
104 | "f71808fg", | |
105 | "f71858fg", | |
106 | "f71862fg", | |
107 | "f71882fg", | |
108 | "f71889fg", | |
109 | }; | |
110 | ||
111 | /* Super-I/O Function prototypes */ | |
112 | static inline int superio_inb(int base, int reg); | |
113 | static inline int superio_inw(int base, int reg); | |
114 | static inline void superio_outb(int base, int reg, u8 val); | |
115 | static inline void superio_set_bit(int base, int reg, int bit); | |
116 | static inline void superio_clear_bit(int base, int reg, int bit); | |
117 | static inline int superio_enter(int base); | |
118 | static inline void superio_select(int base, int ld); | |
119 | static inline void superio_exit(int base); | |
120 | ||
121 | struct 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 | ||
137 | static struct watchdog_data watchdog = { | |
138 | .lock = __MUTEX_INITIALIZER(watchdog.lock), | |
139 | }; | |
140 | ||
141 | /* Super I/O functions */ | |
142 | static inline int superio_inb(int base, int reg) | |
143 | { | |
144 | outb(reg, base); | |
145 | return inb(base + 1); | |
146 | } | |
147 | ||
148 | static 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 | ||
156 | static inline void superio_outb(int base, int reg, u8 val) | |
157 | { | |
158 | outb(reg, base); | |
159 | outb(val, base + 1); | |
160 | } | |
161 | ||
162 | static 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 | ||
169 | static 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 | ||
176 | static 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 | ||
192 | static inline void superio_select(int base, int ld) | |
193 | { | |
194 | outb(SIO_REG_LDSEL, base); | |
195 | outb(ld, base + 1); | |
196 | } | |
197 | ||
198 | static inline void superio_exit(int base) | |
199 | { | |
200 | outb(SIO_LOCK_KEY, base); | |
201 | release_region(base, 2); | |
202 | } | |
203 | ||
204 | static 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 | ||
228 | static 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 | ||
250 | exit_unlock: | |
251 | mutex_unlock(&watchdog.lock); | |
252 | return err; | |
253 | } | |
254 | ||
255 | static 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 | ||
280 | exit_unlock: | |
281 | mutex_unlock(&watchdog.lock); | |
282 | return err; | |
283 | } | |
284 | ||
285 | static 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 | ||
dee00abb GS |
311 | case f71889fg: |
312 | /* set pin 40 to WDTRST# */ | |
313 | superio_outb(watchdog.sioaddr, 0x2b, | |
314 | superio_inb(watchdog.sioaddr, 0x2b) & 0xcf); | |
315 | break; | |
316 | ||
96cb4eb0 GS |
317 | 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 | ||
352 | exit_superio: | |
353 | superio_exit(watchdog.sioaddr); | |
354 | exit_unlock: | |
355 | mutex_unlock(&watchdog.lock); | |
356 | ||
357 | return err; | |
358 | } | |
359 | ||
360 | static 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 | ||
375 | exit_unlock: | |
376 | mutex_unlock(&watchdog.lock); | |
377 | ||
378 | return err; | |
379 | } | |
380 | ||
381 | static 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 | ||
392 | static 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 | ||
411 | exit_unlock: | |
412 | mutex_unlock(&watchdog.lock); | |
413 | return is_running; | |
414 | } | |
415 | ||
416 | /* /dev/watchdog api */ | |
417 | ||
418 | static 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 | ||
439 | static 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 | ||
464 | static 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 | */ | |
503 | static 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 | ||
564 | static 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 | ||
572 | static 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 | ||
581 | static struct miscdevice watchdog_miscdev = { | |
582 | .minor = WATCHDOG_MINOR, | |
583 | .name = "watchdog", | |
584 | .fops = &watchdog_fops, | |
585 | }; | |
586 | ||
587 | static struct notifier_block watchdog_notifier = { | |
588 | .notifier_call = watchdog_notify_sys, | |
589 | }; | |
590 | ||
591 | static 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 | ||
685 | exit_unlock: | |
686 | mutex_unlock(&watchdog.lock); | |
687 | exit_miscdev: | |
688 | misc_deregister(&watchdog_miscdev); | |
689 | exit_reboot: | |
690 | unregister_reboot_notifier(&watchdog_notifier); | |
691 | ||
692 | return err; | |
693 | } | |
694 | ||
695 | static 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; | |
96cb4eb0 | 717 | case SIO_F71889_ID: |
dee00abb GS |
718 | watchdog.type = f71889fg; |
719 | break; | |
720 | case SIO_F71862_ID: | |
96cb4eb0 GS |
721 | /* 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)); | |
738 | exit: | |
739 | superio_exit(sioaddr); | |
740 | return err; | |
741 | } | |
742 | ||
743 | static 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 | ||
760 | static 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 | ||
771 | MODULE_DESCRIPTION("F71808E Watchdog Driver"); | |
772 | MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>"); | |
773 | MODULE_LICENSE("GPL"); | |
774 | ||
775 | module_init(f71808e_init); | |
776 | module_exit(f71808e_exit); |