]>
Commit | Line | Data |
---|---|---|
485ae77d SA |
1 | /* |
2 | * SMsC 37B787 Watchdog Timer driver for Linux 2.6.x.x | |
3 | * | |
4 | * Based on acquirewdt.c by Alan Cox <alan@redhat.com> | |
5 | * and some other existing drivers | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
8386c8cf | 11 | * |
485ae77d SA |
12 | * The authors do NOT admit liability nor provide warranty for |
13 | * any of this software. This material is provided "AS-IS" in | |
14 | * the hope that it may be useful for others. | |
15 | * | |
16 | * (C) Copyright 2003-2006 Sven Anders <anders@anduras.de> | |
17 | * | |
18 | * History: | |
19 | * 2003 - Created version 1.0 for Linux 2.4.x. | |
20 | * 2006 - Ported to Linux 2.6, added nowayout and MAGICCLOSE | |
21 | * features. Released version 1.1 | |
22 | * | |
23 | * Theory of operation: | |
24 | * | |
25 | * A Watchdog Timer (WDT) is a hardware circuit that can | |
26 | * reset the computer system in case of a software fault. | |
27 | * You probably knew that already. | |
28 | * | |
29 | * Usually a userspace daemon will notify the kernel WDT driver | |
30 | * via the /dev/watchdog special device file that userspace is | |
31 | * still alive, at regular intervals. When such a notification | |
32 | * occurs, the driver will usually tell the hardware watchdog | |
33 | * that everything is in order, and that the watchdog should wait | |
34 | * for yet another little while to reset the system. | |
35 | * If userspace fails (RAM error, kernel bug, whatever), the | |
36 | * notifications cease to occur, and the hardware watchdog will | |
37 | * reset the system (causing a reboot) after the timeout occurs. | |
38 | * | |
39 | * Create device with: | |
40 | * mknod /dev/watchdog c 10 130 | |
41 | * | |
42 | * For an example userspace keep-alive daemon, see: | |
43 | * Documentation/watchdog/watchdog.txt | |
44 | */ | |
45 | ||
46 | #include <linux/module.h> | |
47 | #include <linux/moduleparam.h> | |
48 | #include <linux/types.h> | |
49 | #include <linux/miscdevice.h> | |
50 | #include <linux/watchdog.h> | |
51 | #include <linux/delay.h> | |
52 | #include <linux/fs.h> | |
53 | #include <linux/ioport.h> | |
54 | #include <linux/notifier.h> | |
55 | #include <linux/reboot.h> | |
56 | #include <linux/init.h> | |
57 | ||
58 | #include <asm/io.h> | |
59 | #include <asm/uaccess.h> | |
60 | #include <asm/system.h> | |
61 | ||
62 | /* enable support for minutes as units? */ | |
63 | /* (does not always work correctly, so disabled by default!) */ | |
64 | #define SMSC_SUPPORT_MINUTES | |
65 | #undef SMSC_SUPPORT_MINUTES | |
66 | ||
67 | #define MAX_TIMEOUT 255 | |
68 | ||
69 | #define UNIT_SECOND 0 | |
70 | #define UNIT_MINUTE 1 | |
71 | ||
72 | #define MODNAME "smsc37b787_wdt: " | |
73 | #define VERSION "1.1" | |
74 | ||
75 | #define WATCHDOG_MINOR 130 | |
76 | ||
77 | #define IOPORT 0x3F0 | |
78 | #define IOPORT_SIZE 2 | |
79 | #define IODEV_NO 8 | |
80 | ||
81 | static int unit = UNIT_SECOND; /* timer's unit */ | |
82 | static int timeout = 60; /* timeout value: default is 60 "units" */ | |
83 | static int timer_enabled = 0; /* is the timer enabled? */ | |
84 | ||
85 | static char expect_close; /* is the close expected? */ | |
86 | ||
87 | static int nowayout = WATCHDOG_NOWAYOUT; | |
88 | ||
89 | /* -- Low level function ----------------------------------------*/ | |
90 | ||
91 | /* unlock the IO chip */ | |
92 | ||
93 | static inline void open_io_config(void) | |
94 | { | |
95 | outb(0x55, IOPORT); | |
96 | mdelay(1); | |
97 | outb(0x55, IOPORT); | |
98 | } | |
99 | ||
100 | /* lock the IO chip */ | |
101 | static inline void close_io_config(void) | |
102 | { | |
103 | outb(0xAA, IOPORT); | |
104 | } | |
105 | ||
106 | /* select the IO device */ | |
107 | static inline void select_io_device(unsigned char devno) | |
108 | { | |
109 | outb(0x07, IOPORT); | |
110 | outb(devno, IOPORT+1); | |
111 | } | |
112 | ||
113 | /* write to the control register */ | |
114 | static inline void write_io_cr(unsigned char reg, unsigned char data) | |
115 | { | |
116 | outb(reg, IOPORT); | |
117 | outb(data, IOPORT+1); | |
118 | } | |
119 | ||
120 | /* read from the control register */ | |
121 | static inline char read_io_cr(unsigned char reg) | |
122 | { | |
123 | outb(reg, IOPORT); | |
124 | return inb(IOPORT+1); | |
125 | } | |
126 | ||
127 | /* -- Medium level functions ------------------------------------*/ | |
128 | ||
129 | static inline void gpio_bit12(unsigned char reg) | |
130 | { | |
131 | // -- General Purpose I/O Bit 1.2 -- | |
132 | // Bit 0, In/Out: 0 = Output, 1 = Input | |
133 | // Bit 1, Polarity: 0 = No Invert, 1 = Invert | |
134 | // Bit 2, Group Enable Intr.: 0 = Disable, 1 = Enable | |
135 | // Bit 3/4, Function select: 00 = GPI/O, 01 = WDT, 10 = P17, | |
136 | // 11 = Either Edge Triggered Intr. 2 | |
137 | // Bit 5/6 (Reserved) | |
138 | // Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain | |
139 | write_io_cr(0xE2, reg); | |
140 | } | |
141 | ||
142 | static inline void gpio_bit13(unsigned char reg) | |
143 | { | |
144 | // -- General Purpose I/O Bit 1.3 -- | |
145 | // Bit 0, In/Out: 0 = Output, 1 = Input | |
146 | // Bit 1, Polarity: 0 = No Invert, 1 = Invert | |
147 | // Bit 2, Group Enable Intr.: 0 = Disable, 1 = Enable | |
148 | // Bit 3, Function select: 0 = GPI/O, 1 = LED | |
149 | // Bit 4-6 (Reserved) | |
150 | // Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain | |
151 | write_io_cr(0xE3, reg); | |
152 | } | |
153 | ||
154 | static inline void wdt_timer_units(unsigned char new_units) | |
155 | { | |
156 | // -- Watchdog timer units -- | |
157 | // Bit 0-6 (Reserved) | |
158 | // Bit 7, WDT Time-out Value Units Select | |
159 | // (0 = Minutes, 1 = Seconds) | |
160 | write_io_cr(0xF1, new_units); | |
161 | } | |
162 | ||
163 | static inline void wdt_timeout_value(unsigned char new_timeout) | |
164 | { | |
165 | // -- Watchdog Timer Time-out Value -- | |
166 | // Bit 0-7 Binary coded units (0=Disabled, 1..255) | |
167 | write_io_cr(0xF2, new_timeout); | |
168 | } | |
169 | ||
170 | static inline void wdt_timer_conf(unsigned char conf) | |
171 | { | |
172 | // -- Watchdog timer configuration -- | |
173 | // Bit 0 Joystick enable: 0* = No Reset, 1 = Reset WDT upon Gameport I/O | |
174 | // Bit 1 Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr. | |
175 | // Bit 2 Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr. | |
176 | // Bit 3 Reset the timer | |
177 | // (Wrong in SMsC documentation? Given as: PowerLED Timout Enabled) | |
178 | // Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled, | |
179 | // 0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15) | |
180 | write_io_cr(0xF3, conf); | |
181 | } | |
182 | ||
183 | static inline void wdt_timer_ctrl(unsigned char reg) | |
184 | { | |
185 | // -- Watchdog timer control -- | |
186 | // Bit 0 Status Bit: 0 = Timer counting, 1 = Timeout occured | |
187 | // Bit 1 Power LED Toggle: 0 = Disable Toggle, 1 = Toggle at 1 Hz | |
188 | // Bit 2 Force Timeout: 1 = Forces WD timeout event (self-cleaning) | |
189 | // Bit 3 P20 Force Timeout enabled: | |
190 | // 0 = P20 activity does not generate the WD timeout event | |
191 | // 1 = P20 Allows rising edge of P20, from the keyboard | |
192 | // controller, to force the WD timeout event. | |
193 | // Bit 4 (Reserved) | |
194 | // -- Soft power management -- | |
195 | // Bit 5 Stop Counter: 1 = Stop software power down counter | |
196 | // set via register 0xB8, (self-cleaning) | |
197 | // (Upon read: 0 = Counter running, 1 = Counter stopped) | |
198 | // Bit 6 Restart Counter: 1 = Restart software power down counter | |
199 | // set via register 0xB8, (self-cleaning) | |
200 | // Bit 7 SPOFF: 1 = Force software power down (self-cleaning) | |
201 | ||
202 | write_io_cr(0xF4, reg); | |
203 | } | |
204 | ||
205 | /* -- Higher level functions ------------------------------------*/ | |
206 | ||
207 | /* initialize watchdog */ | |
208 | ||
209 | static void wb_smsc_wdt_initialize(void) | |
210 | { | |
211 | unsigned char old; | |
212 | ||
213 | open_io_config(); | |
214 | select_io_device(IODEV_NO); | |
215 | ||
216 | // enable the watchdog | |
217 | gpio_bit13(0x08); // Select pin 80 = LED not GPIO | |
218 | gpio_bit12(0x0A); // Set pin 79 = WDT not GPIO/Output/Polarity=Invert | |
219 | ||
220 | // disable the timeout | |
221 | wdt_timeout_value(0); | |
222 | ||
223 | // reset control register | |
224 | wdt_timer_ctrl(0x00); | |
225 | ||
226 | // reset configuration register | |
227 | wdt_timer_conf(0x00); | |
228 | ||
229 | // read old (timer units) register | |
230 | old = read_io_cr(0xF1) & 0x7F; | |
231 | if (unit == UNIT_SECOND) old |= 0x80; // set to seconds | |
232 | ||
233 | // set the watchdog timer units | |
234 | wdt_timer_units(old); | |
235 | ||
236 | close_io_config(); | |
237 | } | |
238 | ||
239 | /* shutdown the watchdog */ | |
240 | ||
241 | static void wb_smsc_wdt_shutdown(void) | |
242 | { | |
243 | open_io_config(); | |
244 | select_io_device(IODEV_NO); | |
245 | ||
246 | // disable the watchdog | |
247 | gpio_bit13(0x09); | |
248 | gpio_bit12(0x09); | |
249 | ||
250 | // reset watchdog config register | |
251 | wdt_timer_conf(0x00); | |
252 | ||
253 | // reset watchdog control register | |
254 | wdt_timer_ctrl(0x00); | |
255 | ||
256 | // disable timeout | |
257 | wdt_timeout_value(0x00); | |
258 | ||
259 | close_io_config(); | |
260 | } | |
261 | ||
262 | /* set timeout => enable watchdog */ | |
263 | ||
264 | static void wb_smsc_wdt_set_timeout(unsigned char new_timeout) | |
265 | { | |
266 | open_io_config(); | |
267 | select_io_device(IODEV_NO); | |
268 | ||
269 | // set Power LED to blink, if we enable the timeout | |
270 | wdt_timer_ctrl((new_timeout == 0) ? 0x00 : 0x02); | |
271 | ||
272 | // set timeout value | |
273 | wdt_timeout_value(new_timeout); | |
274 | ||
275 | close_io_config(); | |
276 | } | |
277 | ||
278 | /* get timeout */ | |
279 | ||
280 | static unsigned char wb_smsc_wdt_get_timeout(void) | |
281 | { | |
282 | unsigned char set_timeout; | |
283 | ||
284 | open_io_config(); | |
285 | select_io_device(IODEV_NO); | |
286 | set_timeout = read_io_cr(0xF2); | |
287 | close_io_config(); | |
288 | ||
289 | return set_timeout; | |
290 | } | |
291 | ||
292 | /* disable watchdog */ | |
293 | ||
294 | static void wb_smsc_wdt_disable(void) | |
295 | { | |
296 | // set the timeout to 0 to disable the watchdog | |
297 | wb_smsc_wdt_set_timeout(0); | |
298 | } | |
299 | ||
300 | /* enable watchdog by setting the current timeout */ | |
301 | ||
302 | static void wb_smsc_wdt_enable(void) | |
303 | { | |
304 | // set the current timeout... | |
305 | wb_smsc_wdt_set_timeout(timeout); | |
306 | } | |
307 | ||
308 | /* reset the timer */ | |
309 | ||
310 | static void wb_smsc_wdt_reset_timer(void) | |
311 | { | |
312 | open_io_config(); | |
313 | select_io_device(IODEV_NO); | |
314 | ||
315 | // reset the timer | |
316 | wdt_timeout_value(timeout); | |
317 | wdt_timer_conf(0x08); | |
318 | ||
319 | close_io_config(); | |
320 | } | |
321 | ||
322 | /* return, if the watchdog is enabled (timeout is set...) */ | |
323 | ||
324 | static int wb_smsc_wdt_status(void) | |
325 | { | |
326 | return (wb_smsc_wdt_get_timeout() == 0) ? 0 : WDIOF_KEEPALIVEPING; | |
327 | } | |
328 | ||
329 | ||
330 | /* -- File operations -------------------------------------------*/ | |
331 | ||
332 | /* open => enable watchdog and set initial timeout */ | |
333 | ||
334 | static int wb_smsc_wdt_open(struct inode *inode, struct file *file) | |
335 | { | |
336 | /* /dev/watchdog can only be opened once */ | |
337 | ||
338 | if (timer_enabled) | |
339 | return -EBUSY; | |
340 | ||
341 | if (nowayout) | |
342 | __module_get(THIS_MODULE); | |
343 | ||
344 | /* Reload and activate timer */ | |
345 | timer_enabled = 1; | |
346 | wb_smsc_wdt_enable(); | |
347 | ||
348 | printk(KERN_INFO MODNAME "Watchdog enabled. Timeout set to %d %s.\n", timeout, (unit == UNIT_SECOND) ? "second(s)" : "minute(s)"); | |
349 | ||
350 | return nonseekable_open(inode, file); | |
351 | } | |
352 | ||
353 | /* close => shut off the timer */ | |
354 | ||
355 | static int wb_smsc_wdt_release(struct inode *inode, struct file *file) | |
356 | { | |
357 | /* Shut off the timer. */ | |
358 | ||
359 | if (expect_close == 42) { | |
360 | wb_smsc_wdt_disable(); | |
361 | printk(KERN_INFO MODNAME "Watchdog disabled, sleeping again...\n"); | |
362 | } else { | |
363 | printk(KERN_CRIT MODNAME "Unexpected close, not stopping watchdog!\n"); | |
364 | wb_smsc_wdt_reset_timer(); | |
365 | } | |
366 | ||
367 | timer_enabled = 0; | |
368 | expect_close = 0; | |
369 | return 0; | |
370 | } | |
371 | ||
372 | /* write => update the timer to keep the machine alive */ | |
373 | ||
374 | static ssize_t wb_smsc_wdt_write(struct file *file, const char __user *data, | |
375 | size_t len, loff_t *ppos) | |
376 | { | |
377 | /* See if we got the magic character 'V' and reload the timer */ | |
378 | if (len) { | |
379 | if (!nowayout) { | |
380 | size_t i; | |
381 | ||
382 | /* reset expect flag */ | |
383 | expect_close = 0; | |
384 | ||
385 | /* scan to see whether or not we got the magic character */ | |
386 | for (i = 0; i != len; i++) { | |
387 | char c; | |
388 | if (get_user(c, data+i)) | |
389 | return -EFAULT; | |
390 | if (c == 'V') | |
391 | expect_close = 42; | |
392 | } | |
393 | } | |
394 | ||
395 | /* someone wrote to us, we should reload the timer */ | |
396 | wb_smsc_wdt_reset_timer(); | |
397 | } | |
398 | return len; | |
399 | } | |
400 | ||
401 | /* ioctl => control interface */ | |
402 | ||
403 | static int wb_smsc_wdt_ioctl(struct inode *inode, struct file *file, | |
404 | unsigned int cmd, unsigned long arg) | |
405 | { | |
406 | int new_timeout; | |
407 | ||
408 | union { | |
409 | struct watchdog_info __user *ident; | |
410 | int __user *i; | |
411 | } uarg; | |
412 | ||
413 | static struct watchdog_info ident = { | |
414 | .options = WDIOF_KEEPALIVEPING | | |
415 | WDIOF_SETTIMEOUT | | |
416 | WDIOF_MAGICCLOSE, | |
417 | .firmware_version = 0, | |
418 | .identity = "SMsC 37B787 Watchdog" | |
419 | }; | |
420 | ||
421 | uarg.i = (int __user *)arg; | |
422 | ||
423 | switch (cmd) { | |
424 | default: | |
8386c8cf | 425 | return -ENOTTY; |
485ae77d SA |
426 | |
427 | case WDIOC_GETSUPPORT: | |
428 | return copy_to_user(uarg.ident, &ident, sizeof(ident)); | |
429 | ||
430 | case WDIOC_GETSTATUS: | |
431 | return put_user(wb_smsc_wdt_status(), uarg.i); | |
432 | ||
433 | case WDIOC_GETBOOTSTATUS: | |
434 | return put_user(0, uarg.i); | |
435 | ||
436 | case WDIOC_KEEPALIVE: | |
437 | wb_smsc_wdt_reset_timer(); | |
438 | return 0; | |
439 | ||
440 | case WDIOC_SETTIMEOUT: | |
441 | if (get_user(new_timeout, uarg.i)) | |
442 | return -EFAULT; | |
443 | ||
444 | // the API states this is given in secs | |
445 | if (unit == UNIT_MINUTE) | |
446 | new_timeout /= 60; | |
447 | ||
448 | if (new_timeout < 0 || new_timeout > MAX_TIMEOUT) | |
449 | return -EINVAL; | |
450 | ||
451 | timeout = new_timeout; | |
452 | wb_smsc_wdt_set_timeout(timeout); | |
453 | ||
454 | // fall through and return the new timeout... | |
455 | ||
456 | case WDIOC_GETTIMEOUT: | |
457 | ||
458 | new_timeout = timeout; | |
459 | ||
460 | if (unit == UNIT_MINUTE) | |
461 | new_timeout *= 60; | |
462 | ||
463 | return put_user(new_timeout, uarg.i); | |
464 | ||
465 | case WDIOC_SETOPTIONS: | |
466 | { | |
467 | int options, retval = -EINVAL; | |
468 | ||
469 | if (get_user(options, uarg.i)) | |
470 | return -EFAULT; | |
471 | ||
472 | if (options & WDIOS_DISABLECARD) { | |
473 | wb_smsc_wdt_disable(); | |
474 | retval = 0; | |
475 | } | |
476 | ||
477 | if (options & WDIOS_ENABLECARD) { | |
478 | wb_smsc_wdt_enable(); | |
479 | retval = 0; | |
480 | } | |
481 | ||
482 | return retval; | |
483 | } | |
484 | } | |
485 | } | |
486 | ||
487 | /* -- Notifier funtions -----------------------------------------*/ | |
488 | ||
489 | static int wb_smsc_wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused) | |
490 | { | |
491 | if (code == SYS_DOWN || code == SYS_HALT) | |
492 | { | |
493 | // set timeout to 0, to avoid possible race-condition | |
494 | timeout = 0; | |
495 | wb_smsc_wdt_disable(); | |
496 | } | |
497 | return NOTIFY_DONE; | |
498 | } | |
499 | ||
500 | /* -- Module's structures ---------------------------------------*/ | |
501 | ||
502 | static struct file_operations wb_smsc_wdt_fops = | |
503 | { | |
504 | .owner = THIS_MODULE, | |
505 | .llseek = no_llseek, | |
506 | .write = wb_smsc_wdt_write, | |
507 | .ioctl = wb_smsc_wdt_ioctl, | |
508 | .open = wb_smsc_wdt_open, | |
509 | .release = wb_smsc_wdt_release | |
510 | }; | |
511 | ||
512 | static struct notifier_block wb_smsc_wdt_notifier = | |
513 | { | |
514 | .notifier_call = wb_smsc_wdt_notify_sys | |
515 | }; | |
516 | ||
517 | static struct miscdevice wb_smsc_wdt_miscdev = | |
518 | { | |
519 | .minor = WATCHDOG_MINOR, | |
520 | .name = "watchdog", | |
521 | .fops = &wb_smsc_wdt_fops, | |
522 | }; | |
523 | ||
524 | /* -- Module init functions -------------------------------------*/ | |
525 | ||
526 | /* module's "constructor" */ | |
527 | ||
528 | static int __init wb_smsc_wdt_init(void) | |
529 | { | |
530 | int ret; | |
531 | ||
532 | printk("SMsC 37B787 watchdog component driver " VERSION " initialising...\n"); | |
533 | ||
534 | if (!request_region(IOPORT, IOPORT_SIZE, "SMsC 37B787 watchdog")) { | |
535 | printk(KERN_ERR MODNAME "Unable to register IO port %#x\n", IOPORT); | |
536 | ret = -EBUSY; | |
537 | goto out_pnp; | |
538 | } | |
539 | ||
540 | ret = register_reboot_notifier(&wb_smsc_wdt_notifier); | |
541 | if (ret) { | |
542 | printk(KERN_ERR MODNAME "Unable to register reboot notifier err = %d\n", ret); | |
543 | goto out_io; | |
544 | } | |
545 | ||
546 | ret = misc_register(&wb_smsc_wdt_miscdev); | |
547 | if (ret) { | |
548 | printk(KERN_ERR MODNAME "Unable to register miscdev on minor %d\n", WATCHDOG_MINOR); | |
549 | goto out_rbt; | |
550 | } | |
551 | ||
552 | // init the watchdog timer | |
553 | wb_smsc_wdt_initialize(); | |
554 | ||
555 | // set new maximum, if it's too big | |
556 | if (timeout > MAX_TIMEOUT) | |
557 | timeout = MAX_TIMEOUT; | |
558 | ||
559 | // output info | |
560 | printk(KERN_INFO MODNAME "Timeout set to %d %s.\n", timeout, (unit == UNIT_SECOND) ? "second(s)" : "minute(s)"); | |
561 | printk(KERN_INFO MODNAME "Watchdog initialized and sleeping (nowayout=%d)...\n", nowayout); | |
562 | ||
563 | // ret = 0 | |
564 | ||
565 | out_clean: | |
566 | return ret; | |
567 | ||
568 | out_rbt: | |
569 | unregister_reboot_notifier(&wb_smsc_wdt_notifier); | |
570 | ||
571 | out_io: | |
572 | release_region(IOPORT, IOPORT_SIZE); | |
573 | ||
574 | out_pnp: | |
575 | goto out_clean; | |
8386c8cf | 576 | } |
485ae77d SA |
577 | |
578 | /* module's "destructor" */ | |
579 | ||
580 | static void __exit wb_smsc_wdt_exit(void) | |
581 | { | |
582 | /* Stop the timer before we leave */ | |
583 | if (!nowayout) | |
584 | { | |
585 | wb_smsc_wdt_shutdown(); | |
586 | printk(KERN_INFO MODNAME "Watchdog disabled.\n"); | |
587 | } | |
588 | ||
589 | misc_deregister(&wb_smsc_wdt_miscdev); | |
590 | unregister_reboot_notifier(&wb_smsc_wdt_notifier); | |
591 | release_region(IOPORT, IOPORT_SIZE); | |
592 | ||
593 | printk("SMsC 37B787 watchdog component driver removed.\n"); | |
594 | } | |
595 | ||
596 | module_init(wb_smsc_wdt_init); | |
597 | module_exit(wb_smsc_wdt_exit); | |
598 | ||
599 | MODULE_AUTHOR("Sven Anders <anders@anduras.de>"); | |
600 | MODULE_DESCRIPTION("Driver for SMsC 37B787 watchdog component (Version " VERSION ")"); | |
601 | MODULE_LICENSE("GPL"); | |
602 | ||
603 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
604 | ||
605 | #ifdef SMSC_SUPPORT_MINUTES | |
606 | module_param(unit, int, 0); | |
607 | MODULE_PARM_DESC(unit, "set unit to use, 0=seconds or 1=minutes, default is 0"); | |
608 | #endif | |
609 | ||
610 | module_param(timeout, int, 60); | |
611 | MODULE_PARM_DESC(timeout, "range is 1-255 units, default is 60"); | |
612 | ||
613 | module_param(nowayout, int, 0); | |
614 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); |