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Commit | Line | Data |
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031f7ede UB |
1 | /* |
2 | * FIXME: add wdrtas_get_status and wdrtas_get_boot_status as soon as | |
3 | * RTAS calls are available | |
4 | */ | |
5 | ||
6 | /* | |
7 | * RTAS watchdog driver | |
8 | * | |
9 | * (C) Copyright IBM Corp. 2005 | |
10 | * device driver to exploit watchdog RTAS functions | |
11 | * | |
12 | * Authors : Utz Bacher <utz.bacher@de.ibm.com> | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2, or (at your option) | |
17 | * any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, write to the Free Software | |
26 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
27 | */ | |
28 | ||
031f7ede UB |
29 | #include <linux/fs.h> |
30 | #include <linux/init.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/miscdevice.h> | |
33 | #include <linux/module.h> | |
34 | #include <linux/notifier.h> | |
35 | #include <linux/reboot.h> | |
36 | #include <linux/types.h> | |
37 | #include <linux/watchdog.h> | |
dae67a28 | 38 | #include <linux/uaccess.h> |
031f7ede UB |
39 | |
40 | #include <asm/rtas.h> | |
031f7ede UB |
41 | |
42 | #define WDRTAS_MAGIC_CHAR 42 | |
43 | #define WDRTAS_SUPPORTED_MASK (WDIOF_SETTIMEOUT | \ | |
44 | WDIOF_MAGICCLOSE) | |
45 | ||
46 | MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>"); | |
47 | MODULE_DESCRIPTION("RTAS watchdog driver"); | |
48 | MODULE_LICENSE("GPL"); | |
49 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
50 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); | |
51 | ||
52 | #ifdef CONFIG_WATCHDOG_NOWAYOUT | |
53 | static int wdrtas_nowayout = 1; | |
54 | #else | |
55 | static int wdrtas_nowayout = 0; | |
56 | #endif | |
57 | ||
58 | static atomic_t wdrtas_miscdev_open = ATOMIC_INIT(0); | |
dae67a28 | 59 | static char wdrtas_expect_close; |
031f7ede UB |
60 | |
61 | static int wdrtas_interval; | |
62 | ||
63 | #define WDRTAS_THERMAL_SENSOR 3 | |
64 | static int wdrtas_token_get_sensor_state; | |
65 | #define WDRTAS_SURVEILLANCE_IND 9000 | |
66 | static int wdrtas_token_set_indicator; | |
67 | #define WDRTAS_SP_SPI 28 | |
68 | static int wdrtas_token_get_sp; | |
69 | static int wdrtas_token_event_scan; | |
70 | ||
71 | #define WDRTAS_DEFAULT_INTERVAL 300 | |
72 | ||
73 | #define WDRTAS_LOGBUFFER_LEN 128 | |
74 | static char wdrtas_logbuffer[WDRTAS_LOGBUFFER_LEN]; | |
75 | ||
76 | ||
77 | /*** watchdog access functions */ | |
78 | ||
79 | /** | |
80 | * wdrtas_set_interval - sets the watchdog interval | |
81 | * @interval: new interval | |
82 | * | |
83 | * returns 0 on success, <0 on failures | |
84 | * | |
85 | * wdrtas_set_interval sets the watchdog keepalive interval by calling the | |
86 | * RTAS function set-indicator (surveillance). The unit of interval is | |
87 | * seconds. | |
88 | */ | |
dae67a28 AC |
89 | |
90 | static int wdrtas_set_interval(int interval) | |
031f7ede UB |
91 | { |
92 | long result; | |
93 | static int print_msg = 10; | |
94 | ||
95 | /* rtas uses minutes */ | |
96 | interval = (interval + 59) / 60; | |
97 | ||
98 | result = rtas_call(wdrtas_token_set_indicator, 3, 1, NULL, | |
99 | WDRTAS_SURVEILLANCE_IND, 0, interval); | |
dae67a28 | 100 | if (result < 0 && print_msg) { |
031f7ede UB |
101 | printk(KERN_ERR "wdrtas: setting the watchdog to %i " |
102 | "timeout failed: %li\n", interval, result); | |
103 | print_msg--; | |
104 | } | |
105 | ||
106 | return result; | |
107 | } | |
108 | ||
109 | /** | |
110 | * wdrtas_get_interval - returns the current watchdog interval | |
111 | * @fallback_value: value (in seconds) to use, if the RTAS call fails | |
112 | * | |
113 | * returns the interval | |
114 | * | |
115 | * wdrtas_get_interval returns the current watchdog keepalive interval | |
116 | * as reported by the RTAS function ibm,get-system-parameter. The unit | |
117 | * of the return value is seconds. | |
118 | */ | |
dae67a28 | 119 | static int wdrtas_get_interval(int fallback_value) |
031f7ede UB |
120 | { |
121 | long result; | |
122 | char value[4]; | |
123 | ||
124 | result = rtas_call(wdrtas_token_get_sp, 3, 1, NULL, | |
125 | WDRTAS_SP_SPI, (void *)__pa(&value), 4); | |
dae67a28 | 126 | if (value[0] != 0 || value[1] != 2 || value[3] != 0 || result < 0) { |
031f7ede UB |
127 | printk(KERN_WARNING "wdrtas: could not get sp_spi watchdog " |
128 | "timeout (%li). Continuing\n", result); | |
129 | return fallback_value; | |
130 | } | |
131 | ||
132 | /* rtas uses minutes */ | |
133 | return ((int)value[2]) * 60; | |
134 | } | |
135 | ||
136 | /** | |
137 | * wdrtas_timer_start - starts watchdog | |
138 | * | |
139 | * wdrtas_timer_start starts the watchdog by calling the RTAS function | |
140 | * set-interval (surveillance) | |
141 | */ | |
dae67a28 | 142 | static void wdrtas_timer_start(void) |
031f7ede UB |
143 | { |
144 | wdrtas_set_interval(wdrtas_interval); | |
145 | } | |
146 | ||
147 | /** | |
148 | * wdrtas_timer_stop - stops watchdog | |
149 | * | |
150 | * wdrtas_timer_stop stops the watchdog timer by calling the RTAS function | |
151 | * set-interval (surveillance) | |
152 | */ | |
dae67a28 | 153 | static void wdrtas_timer_stop(void) |
031f7ede UB |
154 | { |
155 | wdrtas_set_interval(0); | |
156 | } | |
157 | ||
158 | /** | |
159 | * wdrtas_log_scanned_event - logs an event we received during keepalive | |
160 | * | |
161 | * wdrtas_log_scanned_event prints a message to the log buffer dumping | |
162 | * the results of the last event-scan call | |
163 | */ | |
dae67a28 | 164 | static void wdrtas_log_scanned_event(void) |
031f7ede UB |
165 | { |
166 | int i; | |
167 | ||
168 | for (i = 0; i < WDRTAS_LOGBUFFER_LEN; i += 16) | |
169 | printk(KERN_INFO "wdrtas: dumping event (line %i/%i), data = " | |
170 | "%02x %02x %02x %02x %02x %02x %02x %02x " | |
171 | "%02x %02x %02x %02x %02x %02x %02x %02x\n", | |
172 | (i / 16) + 1, (WDRTAS_LOGBUFFER_LEN / 16), | |
dae67a28 AC |
173 | wdrtas_logbuffer[i + 0], wdrtas_logbuffer[i + 1], |
174 | wdrtas_logbuffer[i + 2], wdrtas_logbuffer[i + 3], | |
175 | wdrtas_logbuffer[i + 4], wdrtas_logbuffer[i + 5], | |
176 | wdrtas_logbuffer[i + 6], wdrtas_logbuffer[i + 7], | |
177 | wdrtas_logbuffer[i + 8], wdrtas_logbuffer[i + 9], | |
178 | wdrtas_logbuffer[i + 10], wdrtas_logbuffer[i + 11], | |
179 | wdrtas_logbuffer[i + 12], wdrtas_logbuffer[i + 13], | |
031f7ede UB |
180 | wdrtas_logbuffer[i + 14], wdrtas_logbuffer[i + 15]); |
181 | } | |
182 | ||
183 | /** | |
184 | * wdrtas_timer_keepalive - resets watchdog timer to keep system alive | |
185 | * | |
186 | * wdrtas_timer_keepalive restarts the watchdog timer by calling the | |
187 | * RTAS function event-scan and repeats these calls as long as there are | |
188 | * events available. All events will be dumped. | |
189 | */ | |
dae67a28 | 190 | static void wdrtas_timer_keepalive(void) |
031f7ede UB |
191 | { |
192 | long result; | |
193 | ||
194 | do { | |
195 | result = rtas_call(wdrtas_token_event_scan, 4, 1, NULL, | |
196 | RTAS_EVENT_SCAN_ALL_EVENTS, 0, | |
197 | (void *)__pa(wdrtas_logbuffer), | |
198 | WDRTAS_LOGBUFFER_LEN); | |
199 | if (result < 0) | |
200 | printk(KERN_ERR "wdrtas: event-scan failed: %li\n", | |
201 | result); | |
202 | if (result == 0) | |
203 | wdrtas_log_scanned_event(); | |
204 | } while (result == 0); | |
205 | } | |
206 | ||
207 | /** | |
208 | * wdrtas_get_temperature - returns current temperature | |
209 | * | |
210 | * returns temperature or <0 on failures | |
211 | * | |
212 | * wdrtas_get_temperature returns the current temperature in Fahrenheit. It | |
213 | * uses the RTAS call get-sensor-state, token 3 to do so | |
214 | */ | |
dae67a28 | 215 | static int wdrtas_get_temperature(void) |
031f7ede UB |
216 | { |
217 | long result; | |
218 | int temperature = 0; | |
219 | ||
220 | result = rtas_call(wdrtas_token_get_sensor_state, 2, 2, | |
221 | (void *)__pa(&temperature), | |
222 | WDRTAS_THERMAL_SENSOR, 0); | |
223 | ||
224 | if (result < 0) | |
225 | printk(KERN_WARNING "wdrtas: reading the thermal sensor " | |
226 | "faild: %li\n", result); | |
227 | else | |
228 | temperature = ((temperature * 9) / 5) + 32; /* fahrenheit */ | |
229 | ||
230 | return temperature; | |
231 | } | |
232 | ||
233 | /** | |
234 | * wdrtas_get_status - returns the status of the watchdog | |
235 | * | |
236 | * returns a bitmask of defines WDIOF_... as defined in | |
237 | * include/linux/watchdog.h | |
238 | */ | |
dae67a28 | 239 | static int wdrtas_get_status(void) |
031f7ede UB |
240 | { |
241 | return 0; /* TODO */ | |
242 | } | |
243 | ||
244 | /** | |
245 | * wdrtas_get_boot_status - returns the reason for the last boot | |
246 | * | |
247 | * returns a bitmask of defines WDIOF_... as defined in | |
248 | * include/linux/watchdog.h, indicating why the watchdog rebooted the system | |
249 | */ | |
dae67a28 | 250 | static int wdrtas_get_boot_status(void) |
031f7ede UB |
251 | { |
252 | return 0; /* TODO */ | |
253 | } | |
254 | ||
255 | /*** watchdog API and operations stuff */ | |
256 | ||
257 | /* wdrtas_write - called when watchdog device is written to | |
258 | * @file: file structure | |
259 | * @buf: user buffer with data | |
260 | * @len: amount to data written | |
261 | * @ppos: position in file | |
262 | * | |
263 | * returns the number of successfully processed characters, which is always | |
264 | * the number of bytes passed to this function | |
265 | * | |
266 | * wdrtas_write processes all the data given to it and looks for the magic | |
267 | * character 'V'. This character allows the watchdog device to be closed | |
268 | * properly. | |
269 | */ | |
dae67a28 | 270 | static ssize_t wdrtas_write(struct file *file, const char __user *buf, |
031f7ede UB |
271 | size_t len, loff_t *ppos) |
272 | { | |
273 | int i; | |
274 | char c; | |
275 | ||
276 | if (!len) | |
277 | goto out; | |
278 | ||
279 | if (!wdrtas_nowayout) { | |
280 | wdrtas_expect_close = 0; | |
281 | /* look for 'V' */ | |
282 | for (i = 0; i < len; i++) { | |
283 | if (get_user(c, buf + i)) | |
284 | return -EFAULT; | |
285 | /* allow to close device */ | |
286 | if (c == 'V') | |
287 | wdrtas_expect_close = WDRTAS_MAGIC_CHAR; | |
288 | } | |
289 | } | |
290 | ||
291 | wdrtas_timer_keepalive(); | |
292 | ||
293 | out: | |
294 | return len; | |
295 | } | |
296 | ||
297 | /** | |
298 | * wdrtas_ioctl - ioctl function for the watchdog device | |
031f7ede UB |
299 | * @file: file structure |
300 | * @cmd: command for ioctl | |
301 | * @arg: argument pointer | |
302 | * | |
303 | * returns 0 on success, <0 on failure | |
304 | * | |
305 | * wdrtas_ioctl implements the watchdog API ioctls | |
306 | */ | |
dae67a28 AC |
307 | |
308 | static long wdrtas_ioctl(struct file *file, unsigned int cmd, | |
309 | unsigned long arg) | |
031f7ede | 310 | { |
e896fd98 | 311 | int __user *argp = (void __user *)arg; |
031f7ede UB |
312 | int i; |
313 | static struct watchdog_info wdinfo = { | |
314 | .options = WDRTAS_SUPPORTED_MASK, | |
315 | .firmware_version = 0, | |
316 | .identity = "wdrtas" | |
317 | }; | |
318 | ||
319 | switch (cmd) { | |
320 | case WDIOC_GETSUPPORT: | |
321 | if (copy_to_user(argp, &wdinfo, sizeof(wdinfo))) | |
322 | return -EFAULT; | |
323 | return 0; | |
324 | ||
325 | case WDIOC_GETSTATUS: | |
326 | i = wdrtas_get_status(); | |
327 | return put_user(i, argp); | |
328 | ||
329 | case WDIOC_GETBOOTSTATUS: | |
330 | i = wdrtas_get_boot_status(); | |
331 | return put_user(i, argp); | |
332 | ||
333 | case WDIOC_GETTEMP: | |
334 | if (wdrtas_token_get_sensor_state == RTAS_UNKNOWN_SERVICE) | |
335 | return -EOPNOTSUPP; | |
336 | ||
337 | i = wdrtas_get_temperature(); | |
338 | return put_user(i, argp); | |
339 | ||
340 | case WDIOC_SETOPTIONS: | |
341 | if (get_user(i, argp)) | |
342 | return -EFAULT; | |
343 | if (i & WDIOS_DISABLECARD) | |
344 | wdrtas_timer_stop(); | |
345 | if (i & WDIOS_ENABLECARD) { | |
346 | wdrtas_timer_keepalive(); | |
347 | wdrtas_timer_start(); | |
348 | } | |
dae67a28 | 349 | /* not implemented. Done by H8 |
031f7ede | 350 | if (i & WDIOS_TEMPPANIC) { |
dae67a28 | 351 | } */ |
031f7ede UB |
352 | return 0; |
353 | ||
354 | case WDIOC_KEEPALIVE: | |
355 | wdrtas_timer_keepalive(); | |
356 | return 0; | |
357 | ||
358 | case WDIOC_SETTIMEOUT: | |
359 | if (get_user(i, argp)) | |
360 | return -EFAULT; | |
361 | ||
362 | if (wdrtas_set_interval(i)) | |
363 | return -EINVAL; | |
364 | ||
365 | wdrtas_timer_keepalive(); | |
366 | ||
367 | if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE) | |
368 | wdrtas_interval = i; | |
369 | else | |
370 | wdrtas_interval = wdrtas_get_interval(i); | |
371 | /* fallthrough */ | |
372 | ||
373 | case WDIOC_GETTIMEOUT: | |
374 | return put_user(wdrtas_interval, argp); | |
375 | ||
376 | default: | |
795b89d2 | 377 | return -ENOTTY; |
031f7ede UB |
378 | } |
379 | } | |
380 | ||
381 | /** | |
382 | * wdrtas_open - open function of watchdog device | |
383 | * @inode: inode structure | |
384 | * @file: file structure | |
385 | * | |
386 | * returns 0 on success, -EBUSY if the file has been opened already, <0 on | |
387 | * other failures | |
388 | * | |
389 | * function called when watchdog device is opened | |
390 | */ | |
dae67a28 | 391 | static int wdrtas_open(struct inode *inode, struct file *file) |
031f7ede UB |
392 | { |
393 | /* only open once */ | |
394 | if (atomic_inc_return(&wdrtas_miscdev_open) > 1) { | |
395 | atomic_dec(&wdrtas_miscdev_open); | |
396 | return -EBUSY; | |
397 | } | |
398 | ||
399 | wdrtas_timer_start(); | |
400 | wdrtas_timer_keepalive(); | |
401 | ||
402 | return nonseekable_open(inode, file); | |
403 | } | |
404 | ||
405 | /** | |
406 | * wdrtas_close - close function of watchdog device | |
407 | * @inode: inode structure | |
408 | * @file: file structure | |
409 | * | |
410 | * returns 0 on success | |
411 | * | |
412 | * close function. Always succeeds | |
413 | */ | |
dae67a28 | 414 | static int wdrtas_close(struct inode *inode, struct file *file) |
031f7ede UB |
415 | { |
416 | /* only stop watchdog, if this was announced using 'V' before */ | |
417 | if (wdrtas_expect_close == WDRTAS_MAGIC_CHAR) | |
418 | wdrtas_timer_stop(); | |
419 | else { | |
420 | printk(KERN_WARNING "wdrtas: got unexpected close. Watchdog " | |
421 | "not stopped.\n"); | |
422 | wdrtas_timer_keepalive(); | |
423 | } | |
424 | ||
425 | wdrtas_expect_close = 0; | |
426 | atomic_dec(&wdrtas_miscdev_open); | |
427 | return 0; | |
428 | } | |
429 | ||
430 | /** | |
431 | * wdrtas_temp_read - gives back the temperature in fahrenheit | |
432 | * @file: file structure | |
433 | * @buf: user buffer | |
434 | * @count: number of bytes to be read | |
435 | * @ppos: position in file | |
436 | * | |
437 | * returns always 1 or -EFAULT in case of user space copy failures, <0 on | |
438 | * other failures | |
439 | * | |
440 | * wdrtas_temp_read gives the temperature to the users by copying this | |
441 | * value as one byte into the user space buffer. The unit is Fahrenheit... | |
442 | */ | |
dae67a28 | 443 | static ssize_t wdrtas_temp_read(struct file *file, char __user *buf, |
031f7ede UB |
444 | size_t count, loff_t *ppos) |
445 | { | |
446 | int temperature = 0; | |
447 | ||
448 | temperature = wdrtas_get_temperature(); | |
449 | if (temperature < 0) | |
450 | return temperature; | |
451 | ||
452 | if (copy_to_user(buf, &temperature, 1)) | |
453 | return -EFAULT; | |
454 | ||
455 | return 1; | |
456 | } | |
457 | ||
458 | /** | |
459 | * wdrtas_temp_open - open function of temperature device | |
460 | * @inode: inode structure | |
461 | * @file: file structure | |
462 | * | |
463 | * returns 0 on success, <0 on failure | |
464 | * | |
465 | * function called when temperature device is opened | |
466 | */ | |
dae67a28 | 467 | static int wdrtas_temp_open(struct inode *inode, struct file *file) |
031f7ede UB |
468 | { |
469 | return nonseekable_open(inode, file); | |
470 | } | |
471 | ||
472 | /** | |
473 | * wdrtas_temp_close - close function of temperature device | |
474 | * @inode: inode structure | |
475 | * @file: file structure | |
476 | * | |
477 | * returns 0 on success | |
478 | * | |
479 | * close function. Always succeeds | |
480 | */ | |
dae67a28 | 481 | static int wdrtas_temp_close(struct inode *inode, struct file *file) |
031f7ede UB |
482 | { |
483 | return 0; | |
484 | } | |
485 | ||
486 | /** | |
487 | * wdrtas_reboot - reboot notifier function | |
488 | * @nb: notifier block structure | |
489 | * @code: reboot code | |
490 | * @ptr: unused | |
491 | * | |
492 | * returns NOTIFY_DONE | |
493 | * | |
494 | * wdrtas_reboot stops the watchdog in case of a reboot | |
495 | */ | |
dae67a28 AC |
496 | static int wdrtas_reboot(struct notifier_block *this, |
497 | unsigned long code, void *ptr) | |
031f7ede | 498 | { |
dae67a28 | 499 | if (code == SYS_DOWN || code == SYS_HALT) |
031f7ede UB |
500 | wdrtas_timer_stop(); |
501 | ||
502 | return NOTIFY_DONE; | |
503 | } | |
504 | ||
505 | /*** initialization stuff */ | |
506 | ||
62322d25 | 507 | static const struct file_operations wdrtas_fops = { |
031f7ede UB |
508 | .owner = THIS_MODULE, |
509 | .llseek = no_llseek, | |
510 | .write = wdrtas_write, | |
dae67a28 | 511 | .unlocked_ioctl = wdrtas_ioctl, |
031f7ede UB |
512 | .open = wdrtas_open, |
513 | .release = wdrtas_close, | |
514 | }; | |
515 | ||
516 | static struct miscdevice wdrtas_miscdev = { | |
517 | .minor = WATCHDOG_MINOR, | |
518 | .name = "watchdog", | |
519 | .fops = &wdrtas_fops, | |
520 | }; | |
521 | ||
62322d25 | 522 | static const struct file_operations wdrtas_temp_fops = { |
031f7ede UB |
523 | .owner = THIS_MODULE, |
524 | .llseek = no_llseek, | |
525 | .read = wdrtas_temp_read, | |
526 | .open = wdrtas_temp_open, | |
527 | .release = wdrtas_temp_close, | |
528 | }; | |
529 | ||
530 | static struct miscdevice wdrtas_tempdev = { | |
531 | .minor = TEMP_MINOR, | |
532 | .name = "temperature", | |
533 | .fops = &wdrtas_temp_fops, | |
534 | }; | |
535 | ||
536 | static struct notifier_block wdrtas_notifier = { | |
537 | .notifier_call = wdrtas_reboot, | |
538 | }; | |
539 | ||
540 | /** | |
541 | * wdrtas_get_tokens - reads in RTAS tokens | |
542 | * | |
543 | * returns 0 on succes, <0 on failure | |
544 | * | |
545 | * wdrtas_get_tokens reads in the tokens for the RTAS calls used in | |
546 | * this watchdog driver. It tolerates, if "get-sensor-state" and | |
547 | * "ibm,get-system-parameter" are not available. | |
548 | */ | |
dae67a28 | 549 | static int wdrtas_get_tokens(void) |
031f7ede UB |
550 | { |
551 | wdrtas_token_get_sensor_state = rtas_token("get-sensor-state"); | |
552 | if (wdrtas_token_get_sensor_state == RTAS_UNKNOWN_SERVICE) { | |
553 | printk(KERN_WARNING "wdrtas: couldn't get token for " | |
554 | "get-sensor-state. Trying to continue without " | |
555 | "temperature support.\n"); | |
556 | } | |
557 | ||
558 | wdrtas_token_get_sp = rtas_token("ibm,get-system-parameter"); | |
559 | if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE) { | |
560 | printk(KERN_WARNING "wdrtas: couldn't get token for " | |
561 | "ibm,get-system-parameter. Trying to continue with " | |
562 | "a default timeout value of %i seconds.\n", | |
563 | WDRTAS_DEFAULT_INTERVAL); | |
564 | } | |
565 | ||
566 | wdrtas_token_set_indicator = rtas_token("set-indicator"); | |
567 | if (wdrtas_token_set_indicator == RTAS_UNKNOWN_SERVICE) { | |
568 | printk(KERN_ERR "wdrtas: couldn't get token for " | |
569 | "set-indicator. Terminating watchdog code.\n"); | |
570 | return -EIO; | |
571 | } | |
572 | ||
573 | wdrtas_token_event_scan = rtas_token("event-scan"); | |
574 | if (wdrtas_token_event_scan == RTAS_UNKNOWN_SERVICE) { | |
575 | printk(KERN_ERR "wdrtas: couldn't get token for event-scan. " | |
576 | "Terminating watchdog code.\n"); | |
577 | return -EIO; | |
578 | } | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
583 | /** | |
584 | * wdrtas_unregister_devs - unregisters the misc dev handlers | |
585 | * | |
586 | * wdrtas_register_devs unregisters the watchdog and temperature watchdog | |
587 | * misc devs | |
588 | */ | |
dae67a28 | 589 | static void wdrtas_unregister_devs(void) |
031f7ede UB |
590 | { |
591 | misc_deregister(&wdrtas_miscdev); | |
592 | if (wdrtas_token_get_sensor_state != RTAS_UNKNOWN_SERVICE) | |
593 | misc_deregister(&wdrtas_tempdev); | |
594 | } | |
595 | ||
596 | /** | |
597 | * wdrtas_register_devs - registers the misc dev handlers | |
598 | * | |
599 | * returns 0 on succes, <0 on failure | |
600 | * | |
601 | * wdrtas_register_devs registers the watchdog and temperature watchdog | |
602 | * misc devs | |
603 | */ | |
dae67a28 | 604 | static int wdrtas_register_devs(void) |
031f7ede UB |
605 | { |
606 | int result; | |
607 | ||
608 | result = misc_register(&wdrtas_miscdev); | |
609 | if (result) { | |
610 | printk(KERN_ERR "wdrtas: couldn't register watchdog misc " | |
611 | "device. Terminating watchdog code.\n"); | |
612 | return result; | |
613 | } | |
614 | ||
615 | if (wdrtas_token_get_sensor_state != RTAS_UNKNOWN_SERVICE) { | |
616 | result = misc_register(&wdrtas_tempdev); | |
617 | if (result) { | |
618 | printk(KERN_WARNING "wdrtas: couldn't register " | |
619 | "watchdog temperature misc device. Continuing " | |
620 | "without temperature support.\n"); | |
621 | wdrtas_token_get_sensor_state = RTAS_UNKNOWN_SERVICE; | |
622 | } | |
623 | } | |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
628 | /** | |
629 | * wdrtas_init - init function of the watchdog driver | |
630 | * | |
631 | * returns 0 on succes, <0 on failure | |
632 | * | |
633 | * registers the file handlers and the reboot notifier | |
634 | */ | |
dae67a28 | 635 | static int __init wdrtas_init(void) |
031f7ede UB |
636 | { |
637 | if (wdrtas_get_tokens()) | |
638 | return -ENODEV; | |
639 | ||
640 | if (wdrtas_register_devs()) | |
641 | return -ENODEV; | |
642 | ||
643 | if (register_reboot_notifier(&wdrtas_notifier)) { | |
644 | printk(KERN_ERR "wdrtas: could not register reboot notifier. " | |
645 | "Terminating watchdog code.\n"); | |
646 | wdrtas_unregister_devs(); | |
647 | return -ENODEV; | |
648 | } | |
649 | ||
650 | if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE) | |
651 | wdrtas_interval = WDRTAS_DEFAULT_INTERVAL; | |
652 | else | |
653 | wdrtas_interval = wdrtas_get_interval(WDRTAS_DEFAULT_INTERVAL); | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
658 | /** | |
659 | * wdrtas_exit - exit function of the watchdog driver | |
660 | * | |
661 | * unregisters the file handlers and the reboot notifier | |
662 | */ | |
dae67a28 | 663 | static void __exit wdrtas_exit(void) |
031f7ede UB |
664 | { |
665 | if (!wdrtas_nowayout) | |
666 | wdrtas_timer_stop(); | |
667 | ||
668 | wdrtas_unregister_devs(); | |
669 | ||
670 | unregister_reboot_notifier(&wdrtas_notifier); | |
671 | } | |
672 | ||
673 | module_init(wdrtas_init); | |
674 | module_exit(wdrtas_exit); |