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96cb4eb0 GS |
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 | ||
27c766aa JP |
22 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
23 | ||
96cb4eb0 GS |
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 /* Watchdog timer logical device */ | |
40 | #define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */ | |
85c130a8 | 41 | #define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */ |
96cb4eb0 GS |
42 | |
43 | #define SIO_REG_LDSEL 0x07 /* Logical device select */ | |
44 | #define SIO_REG_DEVID 0x20 /* Device ID (2 bytes) */ | |
45 | #define SIO_REG_DEVREV 0x22 /* Device revision */ | |
46 | #define SIO_REG_MANID 0x23 /* Fintek ID (2 bytes) */ | |
7977ff6e | 47 | #define SIO_REG_ROM_ADDR_SEL 0x27 /* ROM address select */ |
14b24a88 | 48 | #define SIO_F81866_REG_PORT_SEL 0x27 /* F81866 Multi-Function Register */ |
f9a9f096 LB |
49 | #define SIO_REG_MFUNCT1 0x29 /* Multi function select 1 */ |
50 | #define SIO_REG_MFUNCT2 0x2a /* Multi function select 2 */ | |
51 | #define SIO_REG_MFUNCT3 0x2b /* Multi function select 3 */ | |
14b24a88 | 52 | #define SIO_F81866_REG_GPIO1 0x2c /* F81866 GPIO1 Enable Register */ |
96cb4eb0 GS |
53 | #define SIO_REG_ENABLE 0x30 /* Logical device enable */ |
54 | #define SIO_REG_ADDR 0x60 /* Logical device address (2 bytes) */ | |
55 | ||
56 | #define SIO_FINTEK_ID 0x1934 /* Manufacturers ID */ | |
f9a9f096 LB |
57 | #define SIO_F71808_ID 0x0901 /* Chipset ID */ |
58 | #define SIO_F71858_ID 0x0507 /* Chipset ID */ | |
96cb4eb0 | 59 | #define SIO_F71862_ID 0x0601 /* Chipset ID */ |
166fbcf8 | 60 | #define SIO_F71868_ID 0x1106 /* Chipset ID */ |
df278dac | 61 | #define SIO_F71869_ID 0x0814 /* Chipset ID */ |
3017020d | 62 | #define SIO_F71869A_ID 0x1007 /* Chipset ID */ |
96cb4eb0 GS |
63 | #define SIO_F71882_ID 0x0541 /* Chipset ID */ |
64 | #define SIO_F71889_ID 0x0723 /* Chipset ID */ | |
ea0c03e8 | 65 | #define SIO_F81865_ID 0x0704 /* Chipset ID */ |
14b24a88 | 66 | #define SIO_F81866_ID 0x1010 /* Chipset ID */ |
96cb4eb0 | 67 | |
96cb4eb0 GS |
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 | ||
b97cb21a | 74 | #define F71808FG_FLAG_WDTMOUT_STS 6 |
96cb4eb0 GS |
75 | #define F71808FG_FLAG_WD_EN 5 |
76 | #define F71808FG_FLAG_WD_PULSE 4 | |
77 | #define F71808FG_FLAG_WD_UNIT 3 | |
78 | ||
ea0c03e8 KP |
79 | #define F81865_REG_WDO_CONF 0xfa |
80 | #define F81865_FLAG_WDOUT_EN 0 | |
81 | ||
96cb4eb0 GS |
82 | /* Default values */ |
83 | #define WATCHDOG_TIMEOUT 60 /* 1 minute default timeout */ | |
84 | #define WATCHDOG_MAX_TIMEOUT (60 * 255) | |
85 | #define WATCHDOG_PULSE_WIDTH 125 /* 125 ms, default pulse width for | |
86 | watchdog signal */ | |
7977ff6e LB |
87 | #define WATCHDOG_F71862FG_PIN 63 /* default watchdog reset output |
88 | pin number 63 */ | |
96cb4eb0 GS |
89 | |
90 | static unsigned short force_id; | |
91 | module_param(force_id, ushort, 0); | |
92 | MODULE_PARM_DESC(force_id, "Override the detected device ID"); | |
93 | ||
94 | static const int max_timeout = WATCHDOG_MAX_TIMEOUT; | |
f9a9f096 | 95 | static int timeout = WATCHDOG_TIMEOUT; /* default timeout in seconds */ |
96cb4eb0 GS |
96 | module_param(timeout, int, 0); |
97 | MODULE_PARM_DESC(timeout, | |
98 | "Watchdog timeout in seconds. 1<= timeout <=" | |
99 | __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default=" | |
100 | __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); | |
101 | ||
102 | static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH; | |
103 | module_param(pulse_width, uint, 0); | |
104 | MODULE_PARM_DESC(pulse_width, | |
166fbcf8 | 105 | "Watchdog signal pulse width. 0(=level), 1, 25, 30, 125, 150, 5000 or 6000 ms" |
96cb4eb0 GS |
106 | " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")"); |
107 | ||
7977ff6e LB |
108 | static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN; |
109 | module_param(f71862fg_pin, uint, 0); | |
110 | MODULE_PARM_DESC(f71862fg_pin, | |
111 | "Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63" | |
112 | " (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")"); | |
113 | ||
90ab5ee9 | 114 | static bool nowayout = WATCHDOG_NOWAYOUT; |
96cb4eb0 GS |
115 | module_param(nowayout, bool, 0444); |
116 | MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close"); | |
117 | ||
118 | static unsigned int start_withtimeout; | |
119 | module_param(start_withtimeout, uint, 0); | |
120 | MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with" | |
121 | " given initial timeout. Zero (default) disables this feature."); | |
122 | ||
166fbcf8 MS |
123 | enum chips { f71808fg, f71858fg, f71862fg, f71868, f71869, f71882fg, f71889fg, |
124 | f81865, f81866}; | |
96cb4eb0 GS |
125 | |
126 | static const char *f71808e_names[] = { | |
127 | "f71808fg", | |
128 | "f71858fg", | |
129 | "f71862fg", | |
166fbcf8 | 130 | "f71868", |
df278dac | 131 | "f71869", |
96cb4eb0 GS |
132 | "f71882fg", |
133 | "f71889fg", | |
ea0c03e8 | 134 | "f81865", |
14b24a88 | 135 | "f81866", |
96cb4eb0 GS |
136 | }; |
137 | ||
138 | /* Super-I/O Function prototypes */ | |
139 | static inline int superio_inb(int base, int reg); | |
140 | static inline int superio_inw(int base, int reg); | |
141 | static inline void superio_outb(int base, int reg, u8 val); | |
142 | static inline void superio_set_bit(int base, int reg, int bit); | |
143 | static inline void superio_clear_bit(int base, int reg, int bit); | |
144 | static inline int superio_enter(int base); | |
145 | static inline void superio_select(int base, int ld); | |
146 | static inline void superio_exit(int base); | |
147 | ||
148 | struct 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; /* content for the wd_time register */ | |
158 | char minutes_mode; | |
159 | u8 pulse_val; /* pulse width flag */ | |
160 | char pulse_mode; /* enable pulse output mode? */ | |
161 | char caused_reboot; /* last reboot was by the watchdog */ | |
162 | }; | |
163 | ||
164 | static struct watchdog_data watchdog = { | |
165 | .lock = __MUTEX_INITIALIZER(watchdog.lock), | |
166 | }; | |
167 | ||
168 | /* Super I/O functions */ | |
169 | static inline int superio_inb(int base, int reg) | |
170 | { | |
171 | outb(reg, base); | |
172 | return inb(base + 1); | |
173 | } | |
174 | ||
175 | static 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 | ||
183 | static inline void superio_outb(int base, int reg, u8 val) | |
184 | { | |
185 | outb(reg, base); | |
186 | outb(val, base + 1); | |
187 | } | |
188 | ||
189 | static 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 | ||
196 | static 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 | ||
203 | static inline int superio_enter(int base) | |
204 | { | |
205 | /* Don't step on other drivers' I/O space by accident */ | |
206 | if (!request_muxed_region(base, 2, DRVNAME)) { | |
27c766aa | 207 | pr_err("I/O address 0x%04x already in use\n", (int)base); |
96cb4eb0 GS |
208 | return -EBUSY; |
209 | } | |
210 | ||
3017020d | 211 | /* according to the datasheet the key must be sent twice! */ |
96cb4eb0 GS |
212 | outb(SIO_UNLOCK_KEY, base); |
213 | outb(SIO_UNLOCK_KEY, base); | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
218 | static inline void superio_select(int base, int ld) | |
219 | { | |
220 | outb(SIO_REG_LDSEL, base); | |
221 | outb(ld, base + 1); | |
222 | } | |
223 | ||
224 | static inline void superio_exit(int base) | |
225 | { | |
226 | outb(SIO_LOCK_KEY, base); | |
227 | release_region(base, 2); | |
228 | } | |
229 | ||
230 | static int watchdog_set_timeout(int timeout) | |
231 | { | |
232 | if (timeout <= 0 | |
233 | || timeout > max_timeout) { | |
27c766aa | 234 | pr_err("watchdog timeout out of range\n"); |
96cb4eb0 GS |
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 | ||
254 | static int watchdog_set_pulse_width(unsigned int pw) | |
255 | { | |
256 | int err = 0; | |
166fbcf8 MS |
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 | } | |
96cb4eb0 GS |
264 | |
265 | mutex_lock(&watchdog.lock); | |
266 | ||
166fbcf8 | 267 | if (pw <= 1) { |
96cb4eb0 | 268 | watchdog.pulse_val = 0; |
166fbcf8 | 269 | } else if (pw <= t1) { |
96cb4eb0 | 270 | watchdog.pulse_val = 1; |
166fbcf8 | 271 | } else if (pw <= t2) { |
96cb4eb0 | 272 | watchdog.pulse_val = 2; |
166fbcf8 | 273 | } else if (pw <= t3) { |
96cb4eb0 GS |
274 | watchdog.pulse_val = 3; |
275 | } else { | |
27c766aa | 276 | pr_err("pulse width out of range\n"); |
96cb4eb0 GS |
277 | err = -EINVAL; |
278 | goto exit_unlock; | |
279 | } | |
280 | ||
281 | watchdog.pulse_mode = pw; | |
282 | ||
283 | exit_unlock: | |
284 | mutex_unlock(&watchdog.lock); | |
285 | return err; | |
286 | } | |
287 | ||
288 | static 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 | /* select minutes for timer units */ | |
300 | superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, | |
301 | F71808FG_FLAG_WD_UNIT); | |
302 | else | |
303 | /* select seconds for timer units */ | |
304 | superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, | |
305 | F71808FG_FLAG_WD_UNIT); | |
306 | ||
307 | /* Set timer value */ | |
308 | superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME, | |
309 | watchdog.timer_val); | |
310 | ||
311 | superio_exit(watchdog.sioaddr); | |
312 | ||
313 | exit_unlock: | |
314 | mutex_unlock(&watchdog.lock); | |
315 | return err; | |
316 | } | |
317 | ||
7977ff6e LB |
318 | static int f71862fg_pin_configure(unsigned short ioaddr) |
319 | { | |
320 | /* When ioaddr is non-zero the calling function has to take care of | |
321 | mutex handling and superio preparation! */ | |
322 | ||
323 | if (f71862fg_pin == 63) { | |
324 | if (ioaddr) { | |
325 | /* SPI must be disabled first to use this pin! */ | |
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 { | |
27c766aa | 333 | pr_err("Invalid argument f71862fg_pin=%d\n", f71862fg_pin); |
7977ff6e LB |
334 | return -EINVAL; |
335 | } | |
336 | return 0; | |
337 | } | |
338 | ||
96cb4eb0 GS |
339 | static int watchdog_start(void) |
340 | { | |
341 | /* Make sure we don't die as soon as the watchdog is enabled below */ | |
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 | /* Watchdog pin configuration */ | |
353 | switch (watchdog.type) { | |
354 | case f71808fg: | |
355 | /* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */ | |
f9a9f096 LB |
356 | superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT2, 3); |
357 | superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 3); | |
96cb4eb0 GS |
358 | break; |
359 | ||
7977ff6e LB |
360 | case f71862fg: |
361 | err = f71862fg_pin_configure(watchdog.sioaddr); | |
362 | if (err) | |
363 | goto exit_superio; | |
364 | break; | |
365 | ||
166fbcf8 | 366 | case f71868: |
df278dac MA |
367 | case f71869: |
368 | /* GPIO14 --> WDTRST# */ | |
369 | superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 4); | |
370 | break; | |
371 | ||
96cb4eb0 GS |
372 | case f71882fg: |
373 | /* Set pin 56 to WDTRST# */ | |
f9a9f096 | 374 | superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1); |
96cb4eb0 GS |
375 | break; |
376 | ||
dee00abb GS |
377 | case f71889fg: |
378 | /* set pin 40 to WDTRST# */ | |
f9a9f096 LB |
379 | superio_outb(watchdog.sioaddr, SIO_REG_MFUNCT3, |
380 | superio_inb(watchdog.sioaddr, SIO_REG_MFUNCT3) & 0xcf); | |
dee00abb GS |
381 | break; |
382 | ||
ea0c03e8 KP |
383 | case f81865: |
384 | /* Set pin 70 to WDTRST# */ | |
385 | superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 5); | |
386 | break; | |
387 | ||
14b24a88 JZHPH |
388 | case f81866: |
389 | /* Set pin 70 to WDTRST# */ | |
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 | * GPIO1 Control Register when 27h BIT3:2 = 01 & BIT0 = 0. | |
396 | * The PIN 70(GPIO15/WDTRST) is controlled by 2Ch: | |
397 | * BIT5: 0 -> WDTRST# | |
398 | * 1 -> GPIO15 | |
399 | */ | |
400 | superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_GPIO1, | |
401 | BIT(5)); | |
402 | break; | |
403 | ||
96cb4eb0 GS |
404 | default: |
405 | /* | |
406 | * 'default' label to shut up the compiler and catch | |
407 | * programmer errors | |
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); | |
ea0c03e8 | 415 | |
14b24a88 | 416 | if (watchdog.type == f81865 || watchdog.type == f81866) |
ea0c03e8 KP |
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); | |
96cb4eb0 GS |
422 | |
423 | superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, | |
424 | F71808FG_FLAG_WD_EN); | |
425 | ||
426 | if (watchdog.pulse_mode) { | |
427 | /* Select "pulse" output mode with given duration */ | |
428 | u8 wdt_conf = superio_inb(watchdog.sioaddr, | |
429 | F71808FG_REG_WDT_CONF); | |
430 | ||
431 | /* Set WD_PSWIDTH bits (1:0) */ | |
432 | wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03); | |
433 | /* Set WD_PULSE to "pulse" mode */ | |
434 | wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE); | |
435 | ||
436 | superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF, | |
437 | wdt_conf); | |
438 | } else { | |
439 | /* Select "level" output mode */ | |
440 | superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF, | |
441 | F71808FG_FLAG_WD_PULSE); | |
442 | } | |
443 | ||
444 | exit_superio: | |
445 | superio_exit(watchdog.sioaddr); | |
446 | exit_unlock: | |
447 | mutex_unlock(&watchdog.lock); | |
448 | ||
449 | return err; | |
450 | } | |
451 | ||
452 | static 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 | ||
467 | exit_unlock: | |
468 | mutex_unlock(&watchdog.lock); | |
469 | ||
470 | return err; | |
471 | } | |
472 | ||
473 | static 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 | ||
484 | static bool watchdog_is_running(void) | |
485 | { | |
486 | /* | |
487 | * if we fail to determine the watchdog's status assume it to be | |
488 | * running to be on the safe side | |
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 | & F71808FG_FLAG_WD_EN); | |
500 | ||
501 | superio_exit(watchdog.sioaddr); | |
502 | ||
503 | exit_unlock: | |
504 | mutex_unlock(&watchdog.lock); | |
505 | return is_running; | |
506 | } | |
507 | ||
508 | /* /dev/watchdog api */ | |
509 | ||
510 | static int watchdog_open(struct inode *inode, struct file *file) | |
511 | { | |
512 | int err; | |
513 | ||
514 | /* If the watchdog is alive we don't need to start it again */ | |
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 | ||
531 | static 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(); | |
27c766aa | 537 | pr_crit("Unexpected close, not stopping watchdog!\n"); |
96cb4eb0 GS |
538 | } else if (!nowayout) { |
539 | watchdog_stop(); | |
540 | } | |
541 | return 0; | |
542 | } | |
543 | ||
544 | /* | |
545 | * watchdog_write: | |
546 | * @file: file handle to the watchdog | |
547 | * @buf: buffer to write | |
548 | * @count: count of bytes | |
549 | * @ppos: pointer to the position to write. No seeks allowed | |
550 | * | |
551 | * A write to a watchdog device is defined as a keepalive signal. Any | |
552 | * write of data will do, as we we don't define content meaning. | |
553 | */ | |
554 | ||
555 | static 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 | /* In case it was set long ago */ | |
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; | |
7bd3e7b7 IP |
569 | if (c == 'V') |
570 | expect_close = true; | |
96cb4eb0 GS |
571 | } |
572 | ||
573 | /* Properly order writes across fork()ed processes */ | |
574 | mutex_lock(&watchdog.lock); | |
575 | watchdog.expect_close = expect_close; | |
576 | mutex_unlock(&watchdog.lock); | |
577 | } | |
578 | ||
579 | /* someone wrote to us, we should restart timer */ | |
580 | watchdog_keepalive(); | |
581 | } | |
582 | return count; | |
583 | } | |
584 | ||
585 | /* | |
586 | * watchdog_ioctl: | |
587 | * @inode: inode of the device | |
588 | * @file: file handle to the device | |
589 | * @cmd: watchdog command | |
590 | * @arg: argument pointer | |
591 | * | |
592 | * The watchdog API defines a common set of functions for all watchdogs | |
593 | * according to their available features. | |
594 | */ | |
595 | static 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(); | |
fd846b57 | 631 | /* fall through */ |
96cb4eb0 GS |
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(); | |
fd846b57 | 645 | /* fall through */ |
96cb4eb0 GS |
646 | |
647 | case WDIOC_GETTIMEOUT: | |
648 | return put_user(watchdog.timeout, uarg.i); | |
649 | ||
650 | default: | |
651 | return -ENOTTY; | |
652 | ||
653 | } | |
654 | } | |
655 | ||
656 | static 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 | ||
664 | static 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 | ||
673 | static struct miscdevice watchdog_miscdev = { | |
674 | .minor = WATCHDOG_MINOR, | |
675 | .name = "watchdog", | |
676 | .fops = &watchdog_fops, | |
677 | }; | |
678 | ||
679 | static struct notifier_block watchdog_notifier = { | |
680 | .notifier_call = watchdog_notify_sys, | |
681 | }; | |
682 | ||
683 | static int __init watchdog_init(int sioaddr) | |
684 | { | |
685 | int wdt_conf, err = 0; | |
686 | ||
687 | /* No need to lock watchdog.lock here because no entry points | |
688 | * into the module have been registered yet. | |
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); | |
b97cb21a | 705 | watchdog.caused_reboot = wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS); |
96cb4eb0 GS |
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) { | |
27c766aa JP |
722 | pr_err("cannot register miscdev on minor=%d\n", |
723 | watchdog_miscdev.minor); | |
96cb4eb0 GS |
724 | goto exit_reboot; |
725 | } | |
726 | ||
727 | if (start_withtimeout) { | |
728 | if (start_withtimeout <= 0 | |
729 | || start_withtimeout > max_timeout) { | |
27c766aa | 730 | pr_err("starting timeout out of range\n"); |
96cb4eb0 GS |
731 | err = -EINVAL; |
732 | goto exit_miscdev; | |
733 | } | |
734 | ||
735 | err = watchdog_start(); | |
736 | if (err) { | |
27c766aa | 737 | pr_err("cannot start watchdog timer\n"); |
96cb4eb0 GS |
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 | /* select minutes for timer units */ | |
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 | /* select seconds for timer units */ | |
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 | ||
27c766aa | 767 | pr_info("watchdog started with initial timeout of %u sec\n", |
96cb4eb0 GS |
768 | start_withtimeout); |
769 | } | |
770 | ||
771 | return 0; | |
772 | ||
773 | exit_unlock: | |
774 | mutex_unlock(&watchdog.lock); | |
775 | exit_miscdev: | |
776 | misc_deregister(&watchdog_miscdev); | |
777 | exit_reboot: | |
778 | unregister_reboot_notifier(&watchdog_notifier); | |
779 | ||
780 | return err; | |
781 | } | |
782 | ||
783 | static 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) { | |
27c766aa | 792 | pr_debug("Not a Fintek device\n"); |
96cb4eb0 GS |
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; | |
7977ff6e LB |
802 | case SIO_F71862_ID: |
803 | watchdog.type = f71862fg; | |
804 | err = f71862fg_pin_configure(0); /* validate module parameter */ | |
805 | break; | |
166fbcf8 MS |
806 | case SIO_F71868_ID: |
807 | watchdog.type = f71868; | |
808 | break; | |
df278dac | 809 | case SIO_F71869_ID: |
3017020d | 810 | case SIO_F71869A_ID: |
df278dac MA |
811 | watchdog.type = f71869; |
812 | break; | |
96cb4eb0 GS |
813 | case SIO_F71882_ID: |
814 | watchdog.type = f71882fg; | |
815 | break; | |
96cb4eb0 | 816 | case SIO_F71889_ID: |
dee00abb GS |
817 | watchdog.type = f71889fg; |
818 | break; | |
96cb4eb0 GS |
819 | case SIO_F71858_ID: |
820 | /* Confirmed (by datasheet) not to have a watchdog. */ | |
821 | err = -ENODEV; | |
822 | goto exit; | |
ea0c03e8 KP |
823 | case SIO_F81865_ID: |
824 | watchdog.type = f81865; | |
14b24a88 JZHPH |
825 | break; |
826 | case SIO_F81866_ID: | |
827 | watchdog.type = f81866; | |
ea0c03e8 | 828 | break; |
96cb4eb0 | 829 | default: |
27c766aa JP |
830 | pr_info("Unrecognized Fintek device: %04x\n", |
831 | (unsigned int)devid); | |
96cb4eb0 GS |
832 | err = -ENODEV; |
833 | goto exit; | |
834 | } | |
835 | ||
27c766aa | 836 | pr_info("Found %s watchdog chip, revision %d\n", |
96cb4eb0 GS |
837 | f71808e_names[watchdog.type], |
838 | (int)superio_inb(sioaddr, SIO_REG_DEVREV)); | |
839 | exit: | |
840 | superio_exit(sioaddr); | |
841 | return err; | |
842 | } | |
843 | ||
844 | static 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 | ||
861 | static void __exit f71808e_exit(void) | |
862 | { | |
863 | if (watchdog_is_running()) { | |
27c766aa | 864 | pr_warn("Watchdog timer still running, stopping it\n"); |
96cb4eb0 GS |
865 | watchdog_stop(); |
866 | } | |
867 | misc_deregister(&watchdog_miscdev); | |
868 | unregister_reboot_notifier(&watchdog_notifier); | |
869 | } | |
870 | ||
871 | MODULE_DESCRIPTION("F71808E Watchdog Driver"); | |
872 | MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>"); | |
873 | MODULE_LICENSE("GPL"); | |
874 | ||
875 | module_init(f71808e_init); | |
876 | module_exit(f71808e_exit); |