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 | ||
b6966b1b MN |
109 | #define WDRTAS_SP_SPI_LEN 4 |
110 | ||
031f7ede UB |
111 | /** |
112 | * wdrtas_get_interval - returns the current watchdog interval | |
113 | * @fallback_value: value (in seconds) to use, if the RTAS call fails | |
114 | * | |
115 | * returns the interval | |
116 | * | |
117 | * wdrtas_get_interval returns the current watchdog keepalive interval | |
118 | * as reported by the RTAS function ibm,get-system-parameter. The unit | |
119 | * of the return value is seconds. | |
120 | */ | |
dae67a28 | 121 | static int wdrtas_get_interval(int fallback_value) |
031f7ede UB |
122 | { |
123 | long result; | |
b6966b1b | 124 | char value[WDRTAS_SP_SPI_LEN]; |
031f7ede | 125 | |
b6966b1b MN |
126 | spin_lock(&rtas_data_buf_lock); |
127 | memset(rtas_data_buf, 0, WDRTAS_SP_SPI_LEN); | |
031f7ede | 128 | result = rtas_call(wdrtas_token_get_sp, 3, 1, NULL, |
b6966b1b MN |
129 | WDRTAS_SP_SPI, __pa(rtas_data_buf), |
130 | WDRTAS_SP_SPI_LEN); | |
131 | ||
132 | memcpy(value, rtas_data_buf, WDRTAS_SP_SPI_LEN); | |
133 | spin_unlock(&rtas_data_buf_lock); | |
134 | ||
dae67a28 | 135 | if (value[0] != 0 || value[1] != 2 || value[3] != 0 || result < 0) { |
031f7ede UB |
136 | printk(KERN_WARNING "wdrtas: could not get sp_spi watchdog " |
137 | "timeout (%li). Continuing\n", result); | |
138 | return fallback_value; | |
139 | } | |
140 | ||
141 | /* rtas uses minutes */ | |
142 | return ((int)value[2]) * 60; | |
143 | } | |
144 | ||
145 | /** | |
146 | * wdrtas_timer_start - starts watchdog | |
147 | * | |
148 | * wdrtas_timer_start starts the watchdog by calling the RTAS function | |
149 | * set-interval (surveillance) | |
150 | */ | |
dae67a28 | 151 | static void wdrtas_timer_start(void) |
031f7ede UB |
152 | { |
153 | wdrtas_set_interval(wdrtas_interval); | |
154 | } | |
155 | ||
156 | /** | |
157 | * wdrtas_timer_stop - stops watchdog | |
158 | * | |
159 | * wdrtas_timer_stop stops the watchdog timer by calling the RTAS function | |
160 | * set-interval (surveillance) | |
161 | */ | |
dae67a28 | 162 | static void wdrtas_timer_stop(void) |
031f7ede UB |
163 | { |
164 | wdrtas_set_interval(0); | |
165 | } | |
166 | ||
167 | /** | |
168 | * wdrtas_log_scanned_event - logs an event we received during keepalive | |
169 | * | |
170 | * wdrtas_log_scanned_event prints a message to the log buffer dumping | |
171 | * the results of the last event-scan call | |
172 | */ | |
dae67a28 | 173 | static void wdrtas_log_scanned_event(void) |
031f7ede UB |
174 | { |
175 | int i; | |
176 | ||
177 | for (i = 0; i < WDRTAS_LOGBUFFER_LEN; i += 16) | |
178 | printk(KERN_INFO "wdrtas: dumping event (line %i/%i), data = " | |
179 | "%02x %02x %02x %02x %02x %02x %02x %02x " | |
180 | "%02x %02x %02x %02x %02x %02x %02x %02x\n", | |
181 | (i / 16) + 1, (WDRTAS_LOGBUFFER_LEN / 16), | |
dae67a28 AC |
182 | wdrtas_logbuffer[i + 0], wdrtas_logbuffer[i + 1], |
183 | wdrtas_logbuffer[i + 2], wdrtas_logbuffer[i + 3], | |
184 | wdrtas_logbuffer[i + 4], wdrtas_logbuffer[i + 5], | |
185 | wdrtas_logbuffer[i + 6], wdrtas_logbuffer[i + 7], | |
186 | wdrtas_logbuffer[i + 8], wdrtas_logbuffer[i + 9], | |
187 | wdrtas_logbuffer[i + 10], wdrtas_logbuffer[i + 11], | |
188 | wdrtas_logbuffer[i + 12], wdrtas_logbuffer[i + 13], | |
031f7ede UB |
189 | wdrtas_logbuffer[i + 14], wdrtas_logbuffer[i + 15]); |
190 | } | |
191 | ||
192 | /** | |
193 | * wdrtas_timer_keepalive - resets watchdog timer to keep system alive | |
194 | * | |
195 | * wdrtas_timer_keepalive restarts the watchdog timer by calling the | |
196 | * RTAS function event-scan and repeats these calls as long as there are | |
197 | * events available. All events will be dumped. | |
198 | */ | |
dae67a28 | 199 | static void wdrtas_timer_keepalive(void) |
031f7ede UB |
200 | { |
201 | long result; | |
202 | ||
203 | do { | |
204 | result = rtas_call(wdrtas_token_event_scan, 4, 1, NULL, | |
205 | RTAS_EVENT_SCAN_ALL_EVENTS, 0, | |
206 | (void *)__pa(wdrtas_logbuffer), | |
207 | WDRTAS_LOGBUFFER_LEN); | |
208 | if (result < 0) | |
209 | printk(KERN_ERR "wdrtas: event-scan failed: %li\n", | |
210 | result); | |
211 | if (result == 0) | |
212 | wdrtas_log_scanned_event(); | |
213 | } while (result == 0); | |
214 | } | |
215 | ||
216 | /** | |
217 | * wdrtas_get_temperature - returns current temperature | |
218 | * | |
219 | * returns temperature or <0 on failures | |
220 | * | |
221 | * wdrtas_get_temperature returns the current temperature in Fahrenheit. It | |
222 | * uses the RTAS call get-sensor-state, token 3 to do so | |
223 | */ | |
dae67a28 | 224 | static int wdrtas_get_temperature(void) |
031f7ede UB |
225 | { |
226 | long result; | |
227 | int temperature = 0; | |
228 | ||
229 | result = rtas_call(wdrtas_token_get_sensor_state, 2, 2, | |
230 | (void *)__pa(&temperature), | |
231 | WDRTAS_THERMAL_SENSOR, 0); | |
232 | ||
233 | if (result < 0) | |
234 | printk(KERN_WARNING "wdrtas: reading the thermal sensor " | |
235 | "faild: %li\n", result); | |
236 | else | |
237 | temperature = ((temperature * 9) / 5) + 32; /* fahrenheit */ | |
238 | ||
239 | return temperature; | |
240 | } | |
241 | ||
242 | /** | |
243 | * wdrtas_get_status - returns the status of the watchdog | |
244 | * | |
245 | * returns a bitmask of defines WDIOF_... as defined in | |
246 | * include/linux/watchdog.h | |
247 | */ | |
dae67a28 | 248 | static int wdrtas_get_status(void) |
031f7ede UB |
249 | { |
250 | return 0; /* TODO */ | |
251 | } | |
252 | ||
253 | /** | |
254 | * wdrtas_get_boot_status - returns the reason for the last boot | |
255 | * | |
256 | * returns a bitmask of defines WDIOF_... as defined in | |
257 | * include/linux/watchdog.h, indicating why the watchdog rebooted the system | |
258 | */ | |
dae67a28 | 259 | static int wdrtas_get_boot_status(void) |
031f7ede UB |
260 | { |
261 | return 0; /* TODO */ | |
262 | } | |
263 | ||
264 | /*** watchdog API and operations stuff */ | |
265 | ||
266 | /* wdrtas_write - called when watchdog device is written to | |
267 | * @file: file structure | |
268 | * @buf: user buffer with data | |
269 | * @len: amount to data written | |
270 | * @ppos: position in file | |
271 | * | |
272 | * returns the number of successfully processed characters, which is always | |
273 | * the number of bytes passed to this function | |
274 | * | |
275 | * wdrtas_write processes all the data given to it and looks for the magic | |
276 | * character 'V'. This character allows the watchdog device to be closed | |
277 | * properly. | |
278 | */ | |
dae67a28 | 279 | static ssize_t wdrtas_write(struct file *file, const char __user *buf, |
031f7ede UB |
280 | size_t len, loff_t *ppos) |
281 | { | |
282 | int i; | |
283 | char c; | |
284 | ||
285 | if (!len) | |
286 | goto out; | |
287 | ||
288 | if (!wdrtas_nowayout) { | |
289 | wdrtas_expect_close = 0; | |
290 | /* look for 'V' */ | |
291 | for (i = 0; i < len; i++) { | |
292 | if (get_user(c, buf + i)) | |
293 | return -EFAULT; | |
294 | /* allow to close device */ | |
295 | if (c == 'V') | |
296 | wdrtas_expect_close = WDRTAS_MAGIC_CHAR; | |
297 | } | |
298 | } | |
299 | ||
300 | wdrtas_timer_keepalive(); | |
301 | ||
302 | out: | |
303 | return len; | |
304 | } | |
305 | ||
306 | /** | |
307 | * wdrtas_ioctl - ioctl function for the watchdog device | |
031f7ede UB |
308 | * @file: file structure |
309 | * @cmd: command for ioctl | |
310 | * @arg: argument pointer | |
311 | * | |
312 | * returns 0 on success, <0 on failure | |
313 | * | |
314 | * wdrtas_ioctl implements the watchdog API ioctls | |
315 | */ | |
dae67a28 AC |
316 | |
317 | static long wdrtas_ioctl(struct file *file, unsigned int cmd, | |
318 | unsigned long arg) | |
031f7ede | 319 | { |
e896fd98 | 320 | int __user *argp = (void __user *)arg; |
031f7ede UB |
321 | int i; |
322 | static struct watchdog_info wdinfo = { | |
323 | .options = WDRTAS_SUPPORTED_MASK, | |
324 | .firmware_version = 0, | |
7944d3a5 | 325 | .identity = "wdrtas", |
031f7ede UB |
326 | }; |
327 | ||
328 | switch (cmd) { | |
329 | case WDIOC_GETSUPPORT: | |
330 | if (copy_to_user(argp, &wdinfo, sizeof(wdinfo))) | |
331 | return -EFAULT; | |
332 | return 0; | |
333 | ||
334 | case WDIOC_GETSTATUS: | |
335 | i = wdrtas_get_status(); | |
336 | return put_user(i, argp); | |
337 | ||
338 | case WDIOC_GETBOOTSTATUS: | |
339 | i = wdrtas_get_boot_status(); | |
340 | return put_user(i, argp); | |
341 | ||
342 | case WDIOC_GETTEMP: | |
343 | if (wdrtas_token_get_sensor_state == RTAS_UNKNOWN_SERVICE) | |
344 | return -EOPNOTSUPP; | |
345 | ||
346 | i = wdrtas_get_temperature(); | |
347 | return put_user(i, argp); | |
348 | ||
349 | case WDIOC_SETOPTIONS: | |
350 | if (get_user(i, argp)) | |
351 | return -EFAULT; | |
352 | if (i & WDIOS_DISABLECARD) | |
353 | wdrtas_timer_stop(); | |
354 | if (i & WDIOS_ENABLECARD) { | |
355 | wdrtas_timer_keepalive(); | |
356 | wdrtas_timer_start(); | |
357 | } | |
dae67a28 | 358 | /* not implemented. Done by H8 |
031f7ede | 359 | if (i & WDIOS_TEMPPANIC) { |
dae67a28 | 360 | } */ |
031f7ede UB |
361 | return 0; |
362 | ||
363 | case WDIOC_KEEPALIVE: | |
364 | wdrtas_timer_keepalive(); | |
365 | return 0; | |
366 | ||
367 | case WDIOC_SETTIMEOUT: | |
368 | if (get_user(i, argp)) | |
369 | return -EFAULT; | |
370 | ||
371 | if (wdrtas_set_interval(i)) | |
372 | return -EINVAL; | |
373 | ||
374 | wdrtas_timer_keepalive(); | |
375 | ||
376 | if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE) | |
377 | wdrtas_interval = i; | |
378 | else | |
379 | wdrtas_interval = wdrtas_get_interval(i); | |
380 | /* fallthrough */ | |
381 | ||
382 | case WDIOC_GETTIMEOUT: | |
383 | return put_user(wdrtas_interval, argp); | |
384 | ||
385 | default: | |
795b89d2 | 386 | return -ENOTTY; |
031f7ede UB |
387 | } |
388 | } | |
389 | ||
390 | /** | |
391 | * wdrtas_open - open function of watchdog device | |
392 | * @inode: inode structure | |
393 | * @file: file structure | |
394 | * | |
395 | * returns 0 on success, -EBUSY if the file has been opened already, <0 on | |
396 | * other failures | |
397 | * | |
398 | * function called when watchdog device is opened | |
399 | */ | |
dae67a28 | 400 | static int wdrtas_open(struct inode *inode, struct file *file) |
031f7ede UB |
401 | { |
402 | /* only open once */ | |
403 | if (atomic_inc_return(&wdrtas_miscdev_open) > 1) { | |
404 | atomic_dec(&wdrtas_miscdev_open); | |
405 | return -EBUSY; | |
406 | } | |
407 | ||
408 | wdrtas_timer_start(); | |
409 | wdrtas_timer_keepalive(); | |
410 | ||
411 | return nonseekable_open(inode, file); | |
412 | } | |
413 | ||
414 | /** | |
415 | * wdrtas_close - close function of watchdog device | |
416 | * @inode: inode structure | |
417 | * @file: file structure | |
418 | * | |
419 | * returns 0 on success | |
420 | * | |
421 | * close function. Always succeeds | |
422 | */ | |
dae67a28 | 423 | static int wdrtas_close(struct inode *inode, struct file *file) |
031f7ede UB |
424 | { |
425 | /* only stop watchdog, if this was announced using 'V' before */ | |
426 | if (wdrtas_expect_close == WDRTAS_MAGIC_CHAR) | |
427 | wdrtas_timer_stop(); | |
428 | else { | |
429 | printk(KERN_WARNING "wdrtas: got unexpected close. Watchdog " | |
430 | "not stopped.\n"); | |
431 | wdrtas_timer_keepalive(); | |
432 | } | |
433 | ||
434 | wdrtas_expect_close = 0; | |
435 | atomic_dec(&wdrtas_miscdev_open); | |
436 | return 0; | |
437 | } | |
438 | ||
439 | /** | |
440 | * wdrtas_temp_read - gives back the temperature in fahrenheit | |
441 | * @file: file structure | |
442 | * @buf: user buffer | |
443 | * @count: number of bytes to be read | |
444 | * @ppos: position in file | |
445 | * | |
446 | * returns always 1 or -EFAULT in case of user space copy failures, <0 on | |
447 | * other failures | |
448 | * | |
449 | * wdrtas_temp_read gives the temperature to the users by copying this | |
450 | * value as one byte into the user space buffer. The unit is Fahrenheit... | |
451 | */ | |
dae67a28 | 452 | static ssize_t wdrtas_temp_read(struct file *file, char __user *buf, |
031f7ede UB |
453 | size_t count, loff_t *ppos) |
454 | { | |
455 | int temperature = 0; | |
456 | ||
457 | temperature = wdrtas_get_temperature(); | |
458 | if (temperature < 0) | |
459 | return temperature; | |
460 | ||
461 | if (copy_to_user(buf, &temperature, 1)) | |
462 | return -EFAULT; | |
463 | ||
464 | return 1; | |
465 | } | |
466 | ||
467 | /** | |
468 | * wdrtas_temp_open - open function of temperature device | |
469 | * @inode: inode structure | |
470 | * @file: file structure | |
471 | * | |
472 | * returns 0 on success, <0 on failure | |
473 | * | |
474 | * function called when temperature device is opened | |
475 | */ | |
dae67a28 | 476 | static int wdrtas_temp_open(struct inode *inode, struct file *file) |
031f7ede UB |
477 | { |
478 | return nonseekable_open(inode, file); | |
479 | } | |
480 | ||
481 | /** | |
482 | * wdrtas_temp_close - close function of temperature device | |
483 | * @inode: inode structure | |
484 | * @file: file structure | |
485 | * | |
486 | * returns 0 on success | |
487 | * | |
488 | * close function. Always succeeds | |
489 | */ | |
dae67a28 | 490 | static int wdrtas_temp_close(struct inode *inode, struct file *file) |
031f7ede UB |
491 | { |
492 | return 0; | |
493 | } | |
494 | ||
495 | /** | |
496 | * wdrtas_reboot - reboot notifier function | |
497 | * @nb: notifier block structure | |
498 | * @code: reboot code | |
499 | * @ptr: unused | |
500 | * | |
501 | * returns NOTIFY_DONE | |
502 | * | |
503 | * wdrtas_reboot stops the watchdog in case of a reboot | |
504 | */ | |
dae67a28 AC |
505 | static int wdrtas_reboot(struct notifier_block *this, |
506 | unsigned long code, void *ptr) | |
031f7ede | 507 | { |
dae67a28 | 508 | if (code == SYS_DOWN || code == SYS_HALT) |
031f7ede UB |
509 | wdrtas_timer_stop(); |
510 | ||
511 | return NOTIFY_DONE; | |
512 | } | |
513 | ||
514 | /*** initialization stuff */ | |
515 | ||
62322d25 | 516 | static const struct file_operations wdrtas_fops = { |
031f7ede UB |
517 | .owner = THIS_MODULE, |
518 | .llseek = no_llseek, | |
519 | .write = wdrtas_write, | |
dae67a28 | 520 | .unlocked_ioctl = wdrtas_ioctl, |
031f7ede UB |
521 | .open = wdrtas_open, |
522 | .release = wdrtas_close, | |
523 | }; | |
524 | ||
525 | static struct miscdevice wdrtas_miscdev = { | |
526 | .minor = WATCHDOG_MINOR, | |
527 | .name = "watchdog", | |
528 | .fops = &wdrtas_fops, | |
529 | }; | |
530 | ||
62322d25 | 531 | static const struct file_operations wdrtas_temp_fops = { |
031f7ede UB |
532 | .owner = THIS_MODULE, |
533 | .llseek = no_llseek, | |
534 | .read = wdrtas_temp_read, | |
535 | .open = wdrtas_temp_open, | |
536 | .release = wdrtas_temp_close, | |
537 | }; | |
538 | ||
539 | static struct miscdevice wdrtas_tempdev = { | |
540 | .minor = TEMP_MINOR, | |
541 | .name = "temperature", | |
542 | .fops = &wdrtas_temp_fops, | |
543 | }; | |
544 | ||
545 | static struct notifier_block wdrtas_notifier = { | |
546 | .notifier_call = wdrtas_reboot, | |
547 | }; | |
548 | ||
549 | /** | |
550 | * wdrtas_get_tokens - reads in RTAS tokens | |
551 | * | |
552 | * returns 0 on succes, <0 on failure | |
553 | * | |
554 | * wdrtas_get_tokens reads in the tokens for the RTAS calls used in | |
555 | * this watchdog driver. It tolerates, if "get-sensor-state" and | |
556 | * "ibm,get-system-parameter" are not available. | |
557 | */ | |
dae67a28 | 558 | static int wdrtas_get_tokens(void) |
031f7ede UB |
559 | { |
560 | wdrtas_token_get_sensor_state = rtas_token("get-sensor-state"); | |
561 | if (wdrtas_token_get_sensor_state == RTAS_UNKNOWN_SERVICE) { | |
562 | printk(KERN_WARNING "wdrtas: couldn't get token for " | |
563 | "get-sensor-state. Trying to continue without " | |
564 | "temperature support.\n"); | |
565 | } | |
566 | ||
567 | wdrtas_token_get_sp = rtas_token("ibm,get-system-parameter"); | |
568 | if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE) { | |
569 | printk(KERN_WARNING "wdrtas: couldn't get token for " | |
570 | "ibm,get-system-parameter. Trying to continue with " | |
571 | "a default timeout value of %i seconds.\n", | |
572 | WDRTAS_DEFAULT_INTERVAL); | |
573 | } | |
574 | ||
575 | wdrtas_token_set_indicator = rtas_token("set-indicator"); | |
576 | if (wdrtas_token_set_indicator == RTAS_UNKNOWN_SERVICE) { | |
577 | printk(KERN_ERR "wdrtas: couldn't get token for " | |
578 | "set-indicator. Terminating watchdog code.\n"); | |
579 | return -EIO; | |
580 | } | |
581 | ||
582 | wdrtas_token_event_scan = rtas_token("event-scan"); | |
583 | if (wdrtas_token_event_scan == RTAS_UNKNOWN_SERVICE) { | |
584 | printk(KERN_ERR "wdrtas: couldn't get token for event-scan. " | |
585 | "Terminating watchdog code.\n"); | |
586 | return -EIO; | |
587 | } | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
592 | /** | |
593 | * wdrtas_unregister_devs - unregisters the misc dev handlers | |
594 | * | |
595 | * wdrtas_register_devs unregisters the watchdog and temperature watchdog | |
596 | * misc devs | |
597 | */ | |
dae67a28 | 598 | static void wdrtas_unregister_devs(void) |
031f7ede UB |
599 | { |
600 | misc_deregister(&wdrtas_miscdev); | |
601 | if (wdrtas_token_get_sensor_state != RTAS_UNKNOWN_SERVICE) | |
602 | misc_deregister(&wdrtas_tempdev); | |
603 | } | |
604 | ||
605 | /** | |
606 | * wdrtas_register_devs - registers the misc dev handlers | |
607 | * | |
608 | * returns 0 on succes, <0 on failure | |
609 | * | |
610 | * wdrtas_register_devs registers the watchdog and temperature watchdog | |
611 | * misc devs | |
612 | */ | |
dae67a28 | 613 | static int wdrtas_register_devs(void) |
031f7ede UB |
614 | { |
615 | int result; | |
616 | ||
617 | result = misc_register(&wdrtas_miscdev); | |
618 | if (result) { | |
619 | printk(KERN_ERR "wdrtas: couldn't register watchdog misc " | |
620 | "device. Terminating watchdog code.\n"); | |
621 | return result; | |
622 | } | |
623 | ||
624 | if (wdrtas_token_get_sensor_state != RTAS_UNKNOWN_SERVICE) { | |
625 | result = misc_register(&wdrtas_tempdev); | |
626 | if (result) { | |
627 | printk(KERN_WARNING "wdrtas: couldn't register " | |
628 | "watchdog temperature misc device. Continuing " | |
629 | "without temperature support.\n"); | |
630 | wdrtas_token_get_sensor_state = RTAS_UNKNOWN_SERVICE; | |
631 | } | |
632 | } | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
637 | /** | |
638 | * wdrtas_init - init function of the watchdog driver | |
639 | * | |
640 | * returns 0 on succes, <0 on failure | |
641 | * | |
642 | * registers the file handlers and the reboot notifier | |
643 | */ | |
dae67a28 | 644 | static int __init wdrtas_init(void) |
031f7ede UB |
645 | { |
646 | if (wdrtas_get_tokens()) | |
647 | return -ENODEV; | |
648 | ||
649 | if (wdrtas_register_devs()) | |
650 | return -ENODEV; | |
651 | ||
652 | if (register_reboot_notifier(&wdrtas_notifier)) { | |
653 | printk(KERN_ERR "wdrtas: could not register reboot notifier. " | |
654 | "Terminating watchdog code.\n"); | |
655 | wdrtas_unregister_devs(); | |
656 | return -ENODEV; | |
657 | } | |
658 | ||
659 | if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE) | |
660 | wdrtas_interval = WDRTAS_DEFAULT_INTERVAL; | |
661 | else | |
662 | wdrtas_interval = wdrtas_get_interval(WDRTAS_DEFAULT_INTERVAL); | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
667 | /** | |
668 | * wdrtas_exit - exit function of the watchdog driver | |
669 | * | |
670 | * unregisters the file handlers and the reboot notifier | |
671 | */ | |
dae67a28 | 672 | static void __exit wdrtas_exit(void) |
031f7ede UB |
673 | { |
674 | if (!wdrtas_nowayout) | |
675 | wdrtas_timer_stop(); | |
676 | ||
677 | wdrtas_unregister_devs(); | |
678 | ||
679 | unregister_reboot_notifier(&wdrtas_notifier); | |
680 | } | |
681 | ||
682 | module_init(wdrtas_init); | |
683 | module_exit(wdrtas_exit); |