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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> | |
aa1fd4d7 | 57 | #include <linux/spinlock.h> |
485ae77d SA |
58 | |
59 | #include <asm/io.h> | |
60 | #include <asm/uaccess.h> | |
61 | #include <asm/system.h> | |
62 | ||
63 | /* enable support for minutes as units? */ | |
64 | /* (does not always work correctly, so disabled by default!) */ | |
65 | #define SMSC_SUPPORT_MINUTES | |
66 | #undef SMSC_SUPPORT_MINUTES | |
67 | ||
68 | #define MAX_TIMEOUT 255 | |
69 | ||
70 | #define UNIT_SECOND 0 | |
71 | #define UNIT_MINUTE 1 | |
72 | ||
73 | #define MODNAME "smsc37b787_wdt: " | |
74 | #define VERSION "1.1" | |
75 | ||
485ae77d SA |
76 | #define IOPORT 0x3F0 |
77 | #define IOPORT_SIZE 2 | |
78 | #define IODEV_NO 8 | |
79 | ||
80 | static int unit = UNIT_SECOND; /* timer's unit */ | |
81 | static int timeout = 60; /* timeout value: default is 60 "units" */ | |
aa1fd4d7 | 82 | static unsigned long timer_enabled = 0; /* is the timer enabled? */ |
485ae77d SA |
83 | |
84 | static char expect_close; /* is the close expected? */ | |
85 | ||
c7dfd0cc | 86 | static DEFINE_SPINLOCK(io_lock);/* to guard the watchdog from io races */ |
aa1fd4d7 | 87 | |
485ae77d SA |
88 | static int nowayout = WATCHDOG_NOWAYOUT; |
89 | ||
90 | /* -- Low level function ----------------------------------------*/ | |
91 | ||
92 | /* unlock the IO chip */ | |
93 | ||
94 | static inline void open_io_config(void) | |
95 | { | |
96 | outb(0x55, IOPORT); | |
97 | mdelay(1); | |
98 | outb(0x55, IOPORT); | |
99 | } | |
100 | ||
101 | /* lock the IO chip */ | |
102 | static inline void close_io_config(void) | |
103 | { | |
104 | outb(0xAA, IOPORT); | |
105 | } | |
106 | ||
107 | /* select the IO device */ | |
108 | static inline void select_io_device(unsigned char devno) | |
109 | { | |
110 | outb(0x07, IOPORT); | |
111 | outb(devno, IOPORT+1); | |
112 | } | |
113 | ||
114 | /* write to the control register */ | |
115 | static inline void write_io_cr(unsigned char reg, unsigned char data) | |
116 | { | |
117 | outb(reg, IOPORT); | |
118 | outb(data, IOPORT+1); | |
119 | } | |
120 | ||
121 | /* read from the control register */ | |
122 | static inline char read_io_cr(unsigned char reg) | |
123 | { | |
124 | outb(reg, IOPORT); | |
125 | return inb(IOPORT+1); | |
126 | } | |
127 | ||
128 | /* -- Medium level functions ------------------------------------*/ | |
129 | ||
130 | static inline void gpio_bit12(unsigned char reg) | |
131 | { | |
132 | // -- General Purpose I/O Bit 1.2 -- | |
133 | // Bit 0, In/Out: 0 = Output, 1 = Input | |
134 | // Bit 1, Polarity: 0 = No Invert, 1 = Invert | |
135 | // Bit 2, Group Enable Intr.: 0 = Disable, 1 = Enable | |
136 | // Bit 3/4, Function select: 00 = GPI/O, 01 = WDT, 10 = P17, | |
137 | // 11 = Either Edge Triggered Intr. 2 | |
138 | // Bit 5/6 (Reserved) | |
139 | // Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain | |
140 | write_io_cr(0xE2, reg); | |
141 | } | |
142 | ||
143 | static inline void gpio_bit13(unsigned char reg) | |
144 | { | |
145 | // -- General Purpose I/O Bit 1.3 -- | |
146 | // Bit 0, In/Out: 0 = Output, 1 = Input | |
147 | // Bit 1, Polarity: 0 = No Invert, 1 = Invert | |
148 | // Bit 2, Group Enable Intr.: 0 = Disable, 1 = Enable | |
149 | // Bit 3, Function select: 0 = GPI/O, 1 = LED | |
150 | // Bit 4-6 (Reserved) | |
151 | // Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain | |
152 | write_io_cr(0xE3, reg); | |
153 | } | |
154 | ||
155 | static inline void wdt_timer_units(unsigned char new_units) | |
156 | { | |
157 | // -- Watchdog timer units -- | |
158 | // Bit 0-6 (Reserved) | |
159 | // Bit 7, WDT Time-out Value Units Select | |
160 | // (0 = Minutes, 1 = Seconds) | |
161 | write_io_cr(0xF1, new_units); | |
162 | } | |
163 | ||
164 | static inline void wdt_timeout_value(unsigned char new_timeout) | |
165 | { | |
166 | // -- Watchdog Timer Time-out Value -- | |
167 | // Bit 0-7 Binary coded units (0=Disabled, 1..255) | |
168 | write_io_cr(0xF2, new_timeout); | |
169 | } | |
170 | ||
171 | static inline void wdt_timer_conf(unsigned char conf) | |
172 | { | |
173 | // -- Watchdog timer configuration -- | |
174 | // Bit 0 Joystick enable: 0* = No Reset, 1 = Reset WDT upon Gameport I/O | |
175 | // Bit 1 Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr. | |
176 | // Bit 2 Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr. | |
177 | // Bit 3 Reset the timer | |
178 | // (Wrong in SMsC documentation? Given as: PowerLED Timout Enabled) | |
179 | // Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled, | |
180 | // 0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15) | |
181 | write_io_cr(0xF3, conf); | |
182 | } | |
183 | ||
184 | static inline void wdt_timer_ctrl(unsigned char reg) | |
185 | { | |
186 | // -- Watchdog timer control -- | |
187 | // Bit 0 Status Bit: 0 = Timer counting, 1 = Timeout occured | |
188 | // Bit 1 Power LED Toggle: 0 = Disable Toggle, 1 = Toggle at 1 Hz | |
189 | // Bit 2 Force Timeout: 1 = Forces WD timeout event (self-cleaning) | |
190 | // Bit 3 P20 Force Timeout enabled: | |
191 | // 0 = P20 activity does not generate the WD timeout event | |
192 | // 1 = P20 Allows rising edge of P20, from the keyboard | |
193 | // controller, to force the WD timeout event. | |
194 | // Bit 4 (Reserved) | |
195 | // -- Soft power management -- | |
196 | // Bit 5 Stop Counter: 1 = Stop software power down counter | |
197 | // set via register 0xB8, (self-cleaning) | |
198 | // (Upon read: 0 = Counter running, 1 = Counter stopped) | |
199 | // Bit 6 Restart Counter: 1 = Restart software power down counter | |
200 | // set via register 0xB8, (self-cleaning) | |
201 | // Bit 7 SPOFF: 1 = Force software power down (self-cleaning) | |
202 | ||
203 | write_io_cr(0xF4, reg); | |
204 | } | |
205 | ||
206 | /* -- Higher level functions ------------------------------------*/ | |
207 | ||
208 | /* initialize watchdog */ | |
209 | ||
210 | static void wb_smsc_wdt_initialize(void) | |
211 | { | |
212 | unsigned char old; | |
213 | ||
aa1fd4d7 | 214 | spin_lock(&io_lock); |
485ae77d SA |
215 | open_io_config(); |
216 | select_io_device(IODEV_NO); | |
217 | ||
218 | // enable the watchdog | |
219 | gpio_bit13(0x08); // Select pin 80 = LED not GPIO | |
220 | gpio_bit12(0x0A); // Set pin 79 = WDT not GPIO/Output/Polarity=Invert | |
221 | ||
222 | // disable the timeout | |
223 | wdt_timeout_value(0); | |
224 | ||
225 | // reset control register | |
226 | wdt_timer_ctrl(0x00); | |
227 | ||
228 | // reset configuration register | |
229 | wdt_timer_conf(0x00); | |
230 | ||
231 | // read old (timer units) register | |
232 | old = read_io_cr(0xF1) & 0x7F; | |
233 | if (unit == UNIT_SECOND) old |= 0x80; // set to seconds | |
234 | ||
235 | // set the watchdog timer units | |
236 | wdt_timer_units(old); | |
237 | ||
238 | close_io_config(); | |
aa1fd4d7 | 239 | spin_unlock(&io_lock); |
485ae77d SA |
240 | } |
241 | ||
242 | /* shutdown the watchdog */ | |
243 | ||
244 | static void wb_smsc_wdt_shutdown(void) | |
245 | { | |
aa1fd4d7 | 246 | spin_lock(&io_lock); |
485ae77d SA |
247 | open_io_config(); |
248 | select_io_device(IODEV_NO); | |
249 | ||
250 | // disable the watchdog | |
251 | gpio_bit13(0x09); | |
252 | gpio_bit12(0x09); | |
253 | ||
254 | // reset watchdog config register | |
255 | wdt_timer_conf(0x00); | |
256 | ||
257 | // reset watchdog control register | |
258 | wdt_timer_ctrl(0x00); | |
259 | ||
260 | // disable timeout | |
261 | wdt_timeout_value(0x00); | |
262 | ||
263 | close_io_config(); | |
aa1fd4d7 | 264 | spin_unlock(&io_lock); |
485ae77d SA |
265 | } |
266 | ||
267 | /* set timeout => enable watchdog */ | |
268 | ||
269 | static void wb_smsc_wdt_set_timeout(unsigned char new_timeout) | |
270 | { | |
aa1fd4d7 | 271 | spin_lock(&io_lock); |
485ae77d SA |
272 | open_io_config(); |
273 | select_io_device(IODEV_NO); | |
274 | ||
275 | // set Power LED to blink, if we enable the timeout | |
276 | wdt_timer_ctrl((new_timeout == 0) ? 0x00 : 0x02); | |
277 | ||
278 | // set timeout value | |
279 | wdt_timeout_value(new_timeout); | |
280 | ||
281 | close_io_config(); | |
aa1fd4d7 | 282 | spin_unlock(&io_lock); |
485ae77d SA |
283 | } |
284 | ||
285 | /* get timeout */ | |
286 | ||
287 | static unsigned char wb_smsc_wdt_get_timeout(void) | |
288 | { | |
289 | unsigned char set_timeout; | |
290 | ||
aa1fd4d7 | 291 | spin_lock(&io_lock); |
485ae77d SA |
292 | open_io_config(); |
293 | select_io_device(IODEV_NO); | |
294 | set_timeout = read_io_cr(0xF2); | |
295 | close_io_config(); | |
aa1fd4d7 | 296 | spin_unlock(&io_lock); |
485ae77d SA |
297 | |
298 | return set_timeout; | |
299 | } | |
300 | ||
301 | /* disable watchdog */ | |
302 | ||
303 | static void wb_smsc_wdt_disable(void) | |
304 | { | |
305 | // set the timeout to 0 to disable the watchdog | |
306 | wb_smsc_wdt_set_timeout(0); | |
307 | } | |
308 | ||
309 | /* enable watchdog by setting the current timeout */ | |
310 | ||
311 | static void wb_smsc_wdt_enable(void) | |
312 | { | |
313 | // set the current timeout... | |
314 | wb_smsc_wdt_set_timeout(timeout); | |
315 | } | |
316 | ||
317 | /* reset the timer */ | |
318 | ||
319 | static void wb_smsc_wdt_reset_timer(void) | |
320 | { | |
aa1fd4d7 | 321 | spin_lock(&io_lock); |
485ae77d SA |
322 | open_io_config(); |
323 | select_io_device(IODEV_NO); | |
324 | ||
325 | // reset the timer | |
326 | wdt_timeout_value(timeout); | |
327 | wdt_timer_conf(0x08); | |
328 | ||
329 | close_io_config(); | |
aa1fd4d7 | 330 | spin_unlock(&io_lock); |
485ae77d SA |
331 | } |
332 | ||
333 | /* return, if the watchdog is enabled (timeout is set...) */ | |
334 | ||
335 | static int wb_smsc_wdt_status(void) | |
336 | { | |
337 | return (wb_smsc_wdt_get_timeout() == 0) ? 0 : WDIOF_KEEPALIVEPING; | |
338 | } | |
339 | ||
340 | ||
341 | /* -- File operations -------------------------------------------*/ | |
342 | ||
343 | /* open => enable watchdog and set initial timeout */ | |
344 | ||
345 | static int wb_smsc_wdt_open(struct inode *inode, struct file *file) | |
346 | { | |
347 | /* /dev/watchdog can only be opened once */ | |
348 | ||
aa1fd4d7 | 349 | if (test_and_set_bit(0, &timer_enabled)) |
485ae77d SA |
350 | return -EBUSY; |
351 | ||
352 | if (nowayout) | |
353 | __module_get(THIS_MODULE); | |
354 | ||
355 | /* Reload and activate timer */ | |
485ae77d SA |
356 | wb_smsc_wdt_enable(); |
357 | ||
358 | printk(KERN_INFO MODNAME "Watchdog enabled. Timeout set to %d %s.\n", timeout, (unit == UNIT_SECOND) ? "second(s)" : "minute(s)"); | |
359 | ||
360 | return nonseekable_open(inode, file); | |
361 | } | |
362 | ||
363 | /* close => shut off the timer */ | |
364 | ||
365 | static int wb_smsc_wdt_release(struct inode *inode, struct file *file) | |
366 | { | |
367 | /* Shut off the timer. */ | |
368 | ||
369 | if (expect_close == 42) { | |
370 | wb_smsc_wdt_disable(); | |
371 | printk(KERN_INFO MODNAME "Watchdog disabled, sleeping again...\n"); | |
372 | } else { | |
373 | printk(KERN_CRIT MODNAME "Unexpected close, not stopping watchdog!\n"); | |
374 | wb_smsc_wdt_reset_timer(); | |
375 | } | |
376 | ||
aa1fd4d7 | 377 | clear_bit(0, &timer_enabled); |
485ae77d SA |
378 | expect_close = 0; |
379 | return 0; | |
380 | } | |
381 | ||
382 | /* write => update the timer to keep the machine alive */ | |
383 | ||
384 | static ssize_t wb_smsc_wdt_write(struct file *file, const char __user *data, | |
385 | size_t len, loff_t *ppos) | |
386 | { | |
387 | /* See if we got the magic character 'V' and reload the timer */ | |
388 | if (len) { | |
389 | if (!nowayout) { | |
390 | size_t i; | |
391 | ||
392 | /* reset expect flag */ | |
393 | expect_close = 0; | |
394 | ||
395 | /* scan to see whether or not we got the magic character */ | |
396 | for (i = 0; i != len; i++) { | |
397 | char c; | |
398 | if (get_user(c, data+i)) | |
399 | return -EFAULT; | |
400 | if (c == 'V') | |
401 | expect_close = 42; | |
402 | } | |
403 | } | |
404 | ||
405 | /* someone wrote to us, we should reload the timer */ | |
406 | wb_smsc_wdt_reset_timer(); | |
407 | } | |
408 | return len; | |
409 | } | |
410 | ||
411 | /* ioctl => control interface */ | |
412 | ||
413 | static int wb_smsc_wdt_ioctl(struct inode *inode, struct file *file, | |
414 | unsigned int cmd, unsigned long arg) | |
415 | { | |
416 | int new_timeout; | |
417 | ||
418 | union { | |
419 | struct watchdog_info __user *ident; | |
420 | int __user *i; | |
421 | } uarg; | |
422 | ||
423 | static struct watchdog_info ident = { | |
424 | .options = WDIOF_KEEPALIVEPING | | |
425 | WDIOF_SETTIMEOUT | | |
426 | WDIOF_MAGICCLOSE, | |
427 | .firmware_version = 0, | |
428 | .identity = "SMsC 37B787 Watchdog" | |
429 | }; | |
430 | ||
431 | uarg.i = (int __user *)arg; | |
432 | ||
433 | switch (cmd) { | |
434 | default: | |
8386c8cf | 435 | return -ENOTTY; |
485ae77d SA |
436 | |
437 | case WDIOC_GETSUPPORT: | |
aa1fd4d7 WVS |
438 | return copy_to_user(uarg.ident, &ident, |
439 | sizeof(ident)) ? -EFAULT : 0; | |
485ae77d SA |
440 | |
441 | case WDIOC_GETSTATUS: | |
442 | return put_user(wb_smsc_wdt_status(), uarg.i); | |
443 | ||
444 | case WDIOC_GETBOOTSTATUS: | |
445 | return put_user(0, uarg.i); | |
446 | ||
447 | case WDIOC_KEEPALIVE: | |
448 | wb_smsc_wdt_reset_timer(); | |
449 | return 0; | |
450 | ||
451 | case WDIOC_SETTIMEOUT: | |
452 | if (get_user(new_timeout, uarg.i)) | |
453 | return -EFAULT; | |
454 | ||
455 | // the API states this is given in secs | |
456 | if (unit == UNIT_MINUTE) | |
457 | new_timeout /= 60; | |
458 | ||
459 | if (new_timeout < 0 || new_timeout > MAX_TIMEOUT) | |
460 | return -EINVAL; | |
461 | ||
462 | timeout = new_timeout; | |
463 | wb_smsc_wdt_set_timeout(timeout); | |
464 | ||
465 | // fall through and return the new timeout... | |
466 | ||
467 | case WDIOC_GETTIMEOUT: | |
468 | ||
469 | new_timeout = timeout; | |
470 | ||
471 | if (unit == UNIT_MINUTE) | |
472 | new_timeout *= 60; | |
473 | ||
474 | return put_user(new_timeout, uarg.i); | |
475 | ||
476 | case WDIOC_SETOPTIONS: | |
477 | { | |
478 | int options, retval = -EINVAL; | |
479 | ||
480 | if (get_user(options, uarg.i)) | |
481 | return -EFAULT; | |
482 | ||
483 | if (options & WDIOS_DISABLECARD) { | |
484 | wb_smsc_wdt_disable(); | |
485 | retval = 0; | |
486 | } | |
487 | ||
488 | if (options & WDIOS_ENABLECARD) { | |
489 | wb_smsc_wdt_enable(); | |
490 | retval = 0; | |
491 | } | |
492 | ||
493 | return retval; | |
494 | } | |
495 | } | |
496 | } | |
497 | ||
498 | /* -- Notifier funtions -----------------------------------------*/ | |
499 | ||
500 | static int wb_smsc_wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused) | |
501 | { | |
502 | if (code == SYS_DOWN || code == SYS_HALT) | |
503 | { | |
504 | // set timeout to 0, to avoid possible race-condition | |
505 | timeout = 0; | |
506 | wb_smsc_wdt_disable(); | |
507 | } | |
508 | return NOTIFY_DONE; | |
509 | } | |
510 | ||
511 | /* -- Module's structures ---------------------------------------*/ | |
512 | ||
2b8693c0 | 513 | static const struct file_operations wb_smsc_wdt_fops = |
485ae77d SA |
514 | { |
515 | .owner = THIS_MODULE, | |
516 | .llseek = no_llseek, | |
517 | .write = wb_smsc_wdt_write, | |
518 | .ioctl = wb_smsc_wdt_ioctl, | |
519 | .open = wb_smsc_wdt_open, | |
aa1fd4d7 | 520 | .release = wb_smsc_wdt_release, |
485ae77d SA |
521 | }; |
522 | ||
523 | static struct notifier_block wb_smsc_wdt_notifier = | |
524 | { | |
aa1fd4d7 | 525 | .notifier_call = wb_smsc_wdt_notify_sys, |
485ae77d SA |
526 | }; |
527 | ||
528 | static struct miscdevice wb_smsc_wdt_miscdev = | |
529 | { | |
530 | .minor = WATCHDOG_MINOR, | |
531 | .name = "watchdog", | |
532 | .fops = &wb_smsc_wdt_fops, | |
533 | }; | |
534 | ||
535 | /* -- Module init functions -------------------------------------*/ | |
536 | ||
537 | /* module's "constructor" */ | |
538 | ||
539 | static int __init wb_smsc_wdt_init(void) | |
540 | { | |
541 | int ret; | |
542 | ||
543 | printk("SMsC 37B787 watchdog component driver " VERSION " initialising...\n"); | |
544 | ||
545 | if (!request_region(IOPORT, IOPORT_SIZE, "SMsC 37B787 watchdog")) { | |
546 | printk(KERN_ERR MODNAME "Unable to register IO port %#x\n", IOPORT); | |
547 | ret = -EBUSY; | |
548 | goto out_pnp; | |
549 | } | |
550 | ||
aa1fd4d7 WVS |
551 | // set new maximum, if it's too big |
552 | if (timeout > MAX_TIMEOUT) | |
553 | timeout = MAX_TIMEOUT; | |
554 | ||
555 | // init the watchdog timer | |
556 | wb_smsc_wdt_initialize(); | |
557 | ||
485ae77d SA |
558 | ret = register_reboot_notifier(&wb_smsc_wdt_notifier); |
559 | if (ret) { | |
560 | printk(KERN_ERR MODNAME "Unable to register reboot notifier err = %d\n", ret); | |
561 | goto out_io; | |
562 | } | |
563 | ||
564 | ret = misc_register(&wb_smsc_wdt_miscdev); | |
565 | if (ret) { | |
566 | printk(KERN_ERR MODNAME "Unable to register miscdev on minor %d\n", WATCHDOG_MINOR); | |
567 | goto out_rbt; | |
568 | } | |
569 | ||
485ae77d SA |
570 | // output info |
571 | printk(KERN_INFO MODNAME "Timeout set to %d %s.\n", timeout, (unit == UNIT_SECOND) ? "second(s)" : "minute(s)"); | |
572 | printk(KERN_INFO MODNAME "Watchdog initialized and sleeping (nowayout=%d)...\n", nowayout); | |
573 | ||
574 | // ret = 0 | |
575 | ||
576 | out_clean: | |
577 | return ret; | |
578 | ||
579 | out_rbt: | |
580 | unregister_reboot_notifier(&wb_smsc_wdt_notifier); | |
581 | ||
582 | out_io: | |
583 | release_region(IOPORT, IOPORT_SIZE); | |
584 | ||
585 | out_pnp: | |
586 | goto out_clean; | |
8386c8cf | 587 | } |
485ae77d SA |
588 | |
589 | /* module's "destructor" */ | |
590 | ||
591 | static void __exit wb_smsc_wdt_exit(void) | |
592 | { | |
593 | /* Stop the timer before we leave */ | |
594 | if (!nowayout) | |
595 | { | |
596 | wb_smsc_wdt_shutdown(); | |
597 | printk(KERN_INFO MODNAME "Watchdog disabled.\n"); | |
598 | } | |
599 | ||
600 | misc_deregister(&wb_smsc_wdt_miscdev); | |
601 | unregister_reboot_notifier(&wb_smsc_wdt_notifier); | |
602 | release_region(IOPORT, IOPORT_SIZE); | |
603 | ||
604 | printk("SMsC 37B787 watchdog component driver removed.\n"); | |
605 | } | |
606 | ||
607 | module_init(wb_smsc_wdt_init); | |
608 | module_exit(wb_smsc_wdt_exit); | |
609 | ||
610 | MODULE_AUTHOR("Sven Anders <anders@anduras.de>"); | |
611 | MODULE_DESCRIPTION("Driver for SMsC 37B787 watchdog component (Version " VERSION ")"); | |
612 | MODULE_LICENSE("GPL"); | |
613 | ||
614 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
615 | ||
616 | #ifdef SMSC_SUPPORT_MINUTES | |
617 | module_param(unit, int, 0); | |
618 | MODULE_PARM_DESC(unit, "set unit to use, 0=seconds or 1=minutes, default is 0"); | |
619 | #endif | |
620 | ||
aa1fd4d7 | 621 | module_param(timeout, int, 0); |
485ae77d SA |
622 | MODULE_PARM_DESC(timeout, "range is 1-255 units, default is 60"); |
623 | ||
624 | module_param(nowayout, int, 0); | |
bffda5c8 | 625 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |