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 | ||
a77dba7e | 52 | static int wdrtas_nowayout = WATCHDOG_NOWAYOUT; |
031f7ede | 53 | static atomic_t wdrtas_miscdev_open = ATOMIC_INIT(0); |
dae67a28 | 54 | static char wdrtas_expect_close; |
031f7ede UB |
55 | |
56 | static int wdrtas_interval; | |
57 | ||
58 | #define WDRTAS_THERMAL_SENSOR 3 | |
59 | static int wdrtas_token_get_sensor_state; | |
60 | #define WDRTAS_SURVEILLANCE_IND 9000 | |
61 | static int wdrtas_token_set_indicator; | |
62 | #define WDRTAS_SP_SPI 28 | |
63 | static int wdrtas_token_get_sp; | |
64 | static int wdrtas_token_event_scan; | |
65 | ||
66 | #define WDRTAS_DEFAULT_INTERVAL 300 | |
67 | ||
68 | #define WDRTAS_LOGBUFFER_LEN 128 | |
69 | static char wdrtas_logbuffer[WDRTAS_LOGBUFFER_LEN]; | |
70 | ||
71 | ||
72 | /*** watchdog access functions */ | |
73 | ||
74 | /** | |
75 | * wdrtas_set_interval - sets the watchdog interval | |
76 | * @interval: new interval | |
77 | * | |
78 | * returns 0 on success, <0 on failures | |
79 | * | |
80 | * wdrtas_set_interval sets the watchdog keepalive interval by calling the | |
81 | * RTAS function set-indicator (surveillance). The unit of interval is | |
82 | * seconds. | |
83 | */ | |
dae67a28 AC |
84 | |
85 | static int wdrtas_set_interval(int interval) | |
031f7ede UB |
86 | { |
87 | long result; | |
88 | static int print_msg = 10; | |
89 | ||
90 | /* rtas uses minutes */ | |
91 | interval = (interval + 59) / 60; | |
92 | ||
93 | result = rtas_call(wdrtas_token_set_indicator, 3, 1, NULL, | |
94 | WDRTAS_SURVEILLANCE_IND, 0, interval); | |
dae67a28 | 95 | if (result < 0 && print_msg) { |
031f7ede UB |
96 | printk(KERN_ERR "wdrtas: setting the watchdog to %i " |
97 | "timeout failed: %li\n", interval, result); | |
98 | print_msg--; | |
99 | } | |
100 | ||
101 | return result; | |
102 | } | |
103 | ||
b6966b1b MN |
104 | #define WDRTAS_SP_SPI_LEN 4 |
105 | ||
031f7ede UB |
106 | /** |
107 | * wdrtas_get_interval - returns the current watchdog interval | |
108 | * @fallback_value: value (in seconds) to use, if the RTAS call fails | |
109 | * | |
110 | * returns the interval | |
111 | * | |
112 | * wdrtas_get_interval returns the current watchdog keepalive interval | |
113 | * as reported by the RTAS function ibm,get-system-parameter. The unit | |
114 | * of the return value is seconds. | |
115 | */ | |
dae67a28 | 116 | static int wdrtas_get_interval(int fallback_value) |
031f7ede UB |
117 | { |
118 | long result; | |
b6966b1b | 119 | char value[WDRTAS_SP_SPI_LEN]; |
031f7ede | 120 | |
b6966b1b MN |
121 | spin_lock(&rtas_data_buf_lock); |
122 | memset(rtas_data_buf, 0, WDRTAS_SP_SPI_LEN); | |
031f7ede | 123 | result = rtas_call(wdrtas_token_get_sp, 3, 1, NULL, |
b6966b1b MN |
124 | WDRTAS_SP_SPI, __pa(rtas_data_buf), |
125 | WDRTAS_SP_SPI_LEN); | |
126 | ||
127 | memcpy(value, rtas_data_buf, WDRTAS_SP_SPI_LEN); | |
128 | spin_unlock(&rtas_data_buf_lock); | |
129 | ||
dae67a28 | 130 | if (value[0] != 0 || value[1] != 2 || value[3] != 0 || result < 0) { |
031f7ede UB |
131 | printk(KERN_WARNING "wdrtas: could not get sp_spi watchdog " |
132 | "timeout (%li). Continuing\n", result); | |
133 | return fallback_value; | |
134 | } | |
135 | ||
136 | /* rtas uses minutes */ | |
137 | return ((int)value[2]) * 60; | |
138 | } | |
139 | ||
140 | /** | |
141 | * wdrtas_timer_start - starts watchdog | |
142 | * | |
143 | * wdrtas_timer_start starts the watchdog by calling the RTAS function | |
144 | * set-interval (surveillance) | |
145 | */ | |
dae67a28 | 146 | static void wdrtas_timer_start(void) |
031f7ede UB |
147 | { |
148 | wdrtas_set_interval(wdrtas_interval); | |
149 | } | |
150 | ||
151 | /** | |
152 | * wdrtas_timer_stop - stops watchdog | |
153 | * | |
154 | * wdrtas_timer_stop stops the watchdog timer by calling the RTAS function | |
155 | * set-interval (surveillance) | |
156 | */ | |
dae67a28 | 157 | static void wdrtas_timer_stop(void) |
031f7ede UB |
158 | { |
159 | wdrtas_set_interval(0); | |
160 | } | |
161 | ||
162 | /** | |
163 | * wdrtas_log_scanned_event - logs an event we received during keepalive | |
164 | * | |
165 | * wdrtas_log_scanned_event prints a message to the log buffer dumping | |
166 | * the results of the last event-scan call | |
167 | */ | |
dae67a28 | 168 | static void wdrtas_log_scanned_event(void) |
031f7ede UB |
169 | { |
170 | int i; | |
171 | ||
172 | for (i = 0; i < WDRTAS_LOGBUFFER_LEN; i += 16) | |
173 | printk(KERN_INFO "wdrtas: dumping event (line %i/%i), data = " | |
174 | "%02x %02x %02x %02x %02x %02x %02x %02x " | |
175 | "%02x %02x %02x %02x %02x %02x %02x %02x\n", | |
176 | (i / 16) + 1, (WDRTAS_LOGBUFFER_LEN / 16), | |
dae67a28 AC |
177 | wdrtas_logbuffer[i + 0], wdrtas_logbuffer[i + 1], |
178 | wdrtas_logbuffer[i + 2], wdrtas_logbuffer[i + 3], | |
179 | wdrtas_logbuffer[i + 4], wdrtas_logbuffer[i + 5], | |
180 | wdrtas_logbuffer[i + 6], wdrtas_logbuffer[i + 7], | |
181 | wdrtas_logbuffer[i + 8], wdrtas_logbuffer[i + 9], | |
182 | wdrtas_logbuffer[i + 10], wdrtas_logbuffer[i + 11], | |
183 | wdrtas_logbuffer[i + 12], wdrtas_logbuffer[i + 13], | |
031f7ede UB |
184 | wdrtas_logbuffer[i + 14], wdrtas_logbuffer[i + 15]); |
185 | } | |
186 | ||
187 | /** | |
188 | * wdrtas_timer_keepalive - resets watchdog timer to keep system alive | |
189 | * | |
190 | * wdrtas_timer_keepalive restarts the watchdog timer by calling the | |
191 | * RTAS function event-scan and repeats these calls as long as there are | |
192 | * events available. All events will be dumped. | |
193 | */ | |
dae67a28 | 194 | static void wdrtas_timer_keepalive(void) |
031f7ede UB |
195 | { |
196 | long result; | |
197 | ||
198 | do { | |
199 | result = rtas_call(wdrtas_token_event_scan, 4, 1, NULL, | |
200 | RTAS_EVENT_SCAN_ALL_EVENTS, 0, | |
201 | (void *)__pa(wdrtas_logbuffer), | |
202 | WDRTAS_LOGBUFFER_LEN); | |
203 | if (result < 0) | |
204 | printk(KERN_ERR "wdrtas: event-scan failed: %li\n", | |
205 | result); | |
206 | if (result == 0) | |
207 | wdrtas_log_scanned_event(); | |
208 | } while (result == 0); | |
209 | } | |
210 | ||
211 | /** | |
212 | * wdrtas_get_temperature - returns current temperature | |
213 | * | |
214 | * returns temperature or <0 on failures | |
215 | * | |
216 | * wdrtas_get_temperature returns the current temperature in Fahrenheit. It | |
217 | * uses the RTAS call get-sensor-state, token 3 to do so | |
218 | */ | |
dae67a28 | 219 | static int wdrtas_get_temperature(void) |
031f7ede | 220 | { |
5ba762c9 | 221 | int result; |
031f7ede UB |
222 | int temperature = 0; |
223 | ||
5ba762c9 | 224 | result = rtas_get_sensor(WDRTAS_THERMAL_SENSOR, 0, &temperature); |
031f7ede UB |
225 | |
226 | if (result < 0) | |
227 | printk(KERN_WARNING "wdrtas: reading the thermal sensor " | |
5ba762c9 | 228 | "failed: %i\n", result); |
031f7ede UB |
229 | else |
230 | temperature = ((temperature * 9) / 5) + 32; /* fahrenheit */ | |
231 | ||
232 | return temperature; | |
233 | } | |
234 | ||
235 | /** | |
236 | * wdrtas_get_status - returns the status of the watchdog | |
237 | * | |
238 | * returns a bitmask of defines WDIOF_... as defined in | |
239 | * include/linux/watchdog.h | |
240 | */ | |
dae67a28 | 241 | static int wdrtas_get_status(void) |
031f7ede UB |
242 | { |
243 | return 0; /* TODO */ | |
244 | } | |
245 | ||
246 | /** | |
247 | * wdrtas_get_boot_status - returns the reason for the last boot | |
248 | * | |
249 | * returns a bitmask of defines WDIOF_... as defined in | |
250 | * include/linux/watchdog.h, indicating why the watchdog rebooted the system | |
251 | */ | |
dae67a28 | 252 | static int wdrtas_get_boot_status(void) |
031f7ede UB |
253 | { |
254 | return 0; /* TODO */ | |
255 | } | |
256 | ||
257 | /*** watchdog API and operations stuff */ | |
258 | ||
259 | /* wdrtas_write - called when watchdog device is written to | |
260 | * @file: file structure | |
261 | * @buf: user buffer with data | |
262 | * @len: amount to data written | |
263 | * @ppos: position in file | |
264 | * | |
265 | * returns the number of successfully processed characters, which is always | |
266 | * the number of bytes passed to this function | |
267 | * | |
268 | * wdrtas_write processes all the data given to it and looks for the magic | |
269 | * character 'V'. This character allows the watchdog device to be closed | |
270 | * properly. | |
271 | */ | |
dae67a28 | 272 | static ssize_t wdrtas_write(struct file *file, const char __user *buf, |
031f7ede UB |
273 | size_t len, loff_t *ppos) |
274 | { | |
275 | int i; | |
276 | char c; | |
277 | ||
278 | if (!len) | |
279 | goto out; | |
280 | ||
281 | if (!wdrtas_nowayout) { | |
282 | wdrtas_expect_close = 0; | |
283 | /* look for 'V' */ | |
284 | for (i = 0; i < len; i++) { | |
285 | if (get_user(c, buf + i)) | |
286 | return -EFAULT; | |
287 | /* allow to close device */ | |
288 | if (c == 'V') | |
289 | wdrtas_expect_close = WDRTAS_MAGIC_CHAR; | |
290 | } | |
291 | } | |
292 | ||
293 | wdrtas_timer_keepalive(); | |
294 | ||
295 | out: | |
296 | return len; | |
297 | } | |
298 | ||
299 | /** | |
300 | * wdrtas_ioctl - ioctl function for the watchdog device | |
031f7ede UB |
301 | * @file: file structure |
302 | * @cmd: command for ioctl | |
303 | * @arg: argument pointer | |
304 | * | |
305 | * returns 0 on success, <0 on failure | |
306 | * | |
307 | * wdrtas_ioctl implements the watchdog API ioctls | |
308 | */ | |
dae67a28 AC |
309 | |
310 | static long wdrtas_ioctl(struct file *file, unsigned int cmd, | |
311 | unsigned long arg) | |
031f7ede | 312 | { |
e896fd98 | 313 | int __user *argp = (void __user *)arg; |
031f7ede | 314 | int i; |
42747d71 | 315 | static const struct watchdog_info wdinfo = { |
031f7ede UB |
316 | .options = WDRTAS_SUPPORTED_MASK, |
317 | .firmware_version = 0, | |
7944d3a5 | 318 | .identity = "wdrtas", |
031f7ede UB |
319 | }; |
320 | ||
321 | switch (cmd) { | |
322 | case WDIOC_GETSUPPORT: | |
323 | if (copy_to_user(argp, &wdinfo, sizeof(wdinfo))) | |
324 | return -EFAULT; | |
325 | return 0; | |
326 | ||
327 | case WDIOC_GETSTATUS: | |
328 | i = wdrtas_get_status(); | |
329 | return put_user(i, argp); | |
330 | ||
331 | case WDIOC_GETBOOTSTATUS: | |
332 | i = wdrtas_get_boot_status(); | |
333 | return put_user(i, argp); | |
334 | ||
335 | case WDIOC_GETTEMP: | |
336 | if (wdrtas_token_get_sensor_state == RTAS_UNKNOWN_SERVICE) | |
337 | return -EOPNOTSUPP; | |
338 | ||
339 | i = wdrtas_get_temperature(); | |
340 | return put_user(i, argp); | |
341 | ||
342 | case WDIOC_SETOPTIONS: | |
343 | if (get_user(i, argp)) | |
344 | return -EFAULT; | |
345 | if (i & WDIOS_DISABLECARD) | |
346 | wdrtas_timer_stop(); | |
347 | if (i & WDIOS_ENABLECARD) { | |
348 | wdrtas_timer_keepalive(); | |
349 | wdrtas_timer_start(); | |
350 | } | |
dae67a28 | 351 | /* not implemented. Done by H8 |
031f7ede | 352 | if (i & WDIOS_TEMPPANIC) { |
dae67a28 | 353 | } */ |
031f7ede UB |
354 | return 0; |
355 | ||
356 | case WDIOC_KEEPALIVE: | |
357 | wdrtas_timer_keepalive(); | |
358 | return 0; | |
359 | ||
360 | case WDIOC_SETTIMEOUT: | |
361 | if (get_user(i, argp)) | |
362 | return -EFAULT; | |
363 | ||
364 | if (wdrtas_set_interval(i)) | |
365 | return -EINVAL; | |
366 | ||
367 | wdrtas_timer_keepalive(); | |
368 | ||
369 | if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE) | |
370 | wdrtas_interval = i; | |
371 | else | |
372 | wdrtas_interval = wdrtas_get_interval(i); | |
373 | /* fallthrough */ | |
374 | ||
375 | case WDIOC_GETTIMEOUT: | |
376 | return put_user(wdrtas_interval, argp); | |
377 | ||
378 | default: | |
795b89d2 | 379 | return -ENOTTY; |
031f7ede UB |
380 | } |
381 | } | |
382 | ||
383 | /** | |
384 | * wdrtas_open - open function of watchdog device | |
385 | * @inode: inode structure | |
386 | * @file: file structure | |
387 | * | |
388 | * returns 0 on success, -EBUSY if the file has been opened already, <0 on | |
389 | * other failures | |
390 | * | |
391 | * function called when watchdog device is opened | |
392 | */ | |
dae67a28 | 393 | static int wdrtas_open(struct inode *inode, struct file *file) |
031f7ede UB |
394 | { |
395 | /* only open once */ | |
396 | if (atomic_inc_return(&wdrtas_miscdev_open) > 1) { | |
397 | atomic_dec(&wdrtas_miscdev_open); | |
398 | return -EBUSY; | |
399 | } | |
400 | ||
401 | wdrtas_timer_start(); | |
402 | wdrtas_timer_keepalive(); | |
403 | ||
404 | return nonseekable_open(inode, file); | |
405 | } | |
406 | ||
407 | /** | |
408 | * wdrtas_close - close function of watchdog device | |
409 | * @inode: inode structure | |
410 | * @file: file structure | |
411 | * | |
412 | * returns 0 on success | |
413 | * | |
414 | * close function. Always succeeds | |
415 | */ | |
dae67a28 | 416 | static int wdrtas_close(struct inode *inode, struct file *file) |
031f7ede UB |
417 | { |
418 | /* only stop watchdog, if this was announced using 'V' before */ | |
419 | if (wdrtas_expect_close == WDRTAS_MAGIC_CHAR) | |
420 | wdrtas_timer_stop(); | |
421 | else { | |
422 | printk(KERN_WARNING "wdrtas: got unexpected close. Watchdog " | |
423 | "not stopped.\n"); | |
424 | wdrtas_timer_keepalive(); | |
425 | } | |
426 | ||
427 | wdrtas_expect_close = 0; | |
428 | atomic_dec(&wdrtas_miscdev_open); | |
429 | return 0; | |
430 | } | |
431 | ||
432 | /** | |
433 | * wdrtas_temp_read - gives back the temperature in fahrenheit | |
434 | * @file: file structure | |
435 | * @buf: user buffer | |
436 | * @count: number of bytes to be read | |
437 | * @ppos: position in file | |
438 | * | |
439 | * returns always 1 or -EFAULT in case of user space copy failures, <0 on | |
440 | * other failures | |
441 | * | |
442 | * wdrtas_temp_read gives the temperature to the users by copying this | |
443 | * value as one byte into the user space buffer. The unit is Fahrenheit... | |
444 | */ | |
dae67a28 | 445 | static ssize_t wdrtas_temp_read(struct file *file, char __user *buf, |
031f7ede UB |
446 | size_t count, loff_t *ppos) |
447 | { | |
448 | int temperature = 0; | |
449 | ||
450 | temperature = wdrtas_get_temperature(); | |
451 | if (temperature < 0) | |
452 | return temperature; | |
453 | ||
454 | if (copy_to_user(buf, &temperature, 1)) | |
455 | return -EFAULT; | |
456 | ||
457 | return 1; | |
458 | } | |
459 | ||
460 | /** | |
461 | * wdrtas_temp_open - open function of temperature device | |
462 | * @inode: inode structure | |
463 | * @file: file structure | |
464 | * | |
465 | * returns 0 on success, <0 on failure | |
466 | * | |
467 | * function called when temperature device is opened | |
468 | */ | |
dae67a28 | 469 | static int wdrtas_temp_open(struct inode *inode, struct file *file) |
031f7ede UB |
470 | { |
471 | return nonseekable_open(inode, file); | |
472 | } | |
473 | ||
474 | /** | |
475 | * wdrtas_temp_close - close function of temperature device | |
476 | * @inode: inode structure | |
477 | * @file: file structure | |
478 | * | |
479 | * returns 0 on success | |
480 | * | |
481 | * close function. Always succeeds | |
482 | */ | |
dae67a28 | 483 | static int wdrtas_temp_close(struct inode *inode, struct file *file) |
031f7ede UB |
484 | { |
485 | return 0; | |
486 | } | |
487 | ||
488 | /** | |
489 | * wdrtas_reboot - reboot notifier function | |
490 | * @nb: notifier block structure | |
491 | * @code: reboot code | |
492 | * @ptr: unused | |
493 | * | |
494 | * returns NOTIFY_DONE | |
495 | * | |
496 | * wdrtas_reboot stops the watchdog in case of a reboot | |
497 | */ | |
dae67a28 AC |
498 | static int wdrtas_reboot(struct notifier_block *this, |
499 | unsigned long code, void *ptr) | |
031f7ede | 500 | { |
dae67a28 | 501 | if (code == SYS_DOWN || code == SYS_HALT) |
031f7ede UB |
502 | wdrtas_timer_stop(); |
503 | ||
504 | return NOTIFY_DONE; | |
505 | } | |
506 | ||
507 | /*** initialization stuff */ | |
508 | ||
62322d25 | 509 | static const struct file_operations wdrtas_fops = { |
031f7ede UB |
510 | .owner = THIS_MODULE, |
511 | .llseek = no_llseek, | |
512 | .write = wdrtas_write, | |
dae67a28 | 513 | .unlocked_ioctl = wdrtas_ioctl, |
031f7ede UB |
514 | .open = wdrtas_open, |
515 | .release = wdrtas_close, | |
516 | }; | |
517 | ||
518 | static struct miscdevice wdrtas_miscdev = { | |
519 | .minor = WATCHDOG_MINOR, | |
520 | .name = "watchdog", | |
521 | .fops = &wdrtas_fops, | |
522 | }; | |
523 | ||
62322d25 | 524 | static const struct file_operations wdrtas_temp_fops = { |
031f7ede UB |
525 | .owner = THIS_MODULE, |
526 | .llseek = no_llseek, | |
527 | .read = wdrtas_temp_read, | |
528 | .open = wdrtas_temp_open, | |
529 | .release = wdrtas_temp_close, | |
530 | }; | |
531 | ||
532 | static struct miscdevice wdrtas_tempdev = { | |
533 | .minor = TEMP_MINOR, | |
534 | .name = "temperature", | |
535 | .fops = &wdrtas_temp_fops, | |
536 | }; | |
537 | ||
538 | static struct notifier_block wdrtas_notifier = { | |
539 | .notifier_call = wdrtas_reboot, | |
540 | }; | |
541 | ||
542 | /** | |
543 | * wdrtas_get_tokens - reads in RTAS tokens | |
544 | * | |
af901ca1 | 545 | * returns 0 on success, <0 on failure |
031f7ede UB |
546 | * |
547 | * wdrtas_get_tokens reads in the tokens for the RTAS calls used in | |
548 | * this watchdog driver. It tolerates, if "get-sensor-state" and | |
549 | * "ibm,get-system-parameter" are not available. | |
550 | */ | |
dae67a28 | 551 | static int wdrtas_get_tokens(void) |
031f7ede UB |
552 | { |
553 | wdrtas_token_get_sensor_state = rtas_token("get-sensor-state"); | |
554 | if (wdrtas_token_get_sensor_state == RTAS_UNKNOWN_SERVICE) { | |
555 | printk(KERN_WARNING "wdrtas: couldn't get token for " | |
556 | "get-sensor-state. Trying to continue without " | |
557 | "temperature support.\n"); | |
558 | } | |
559 | ||
560 | wdrtas_token_get_sp = rtas_token("ibm,get-system-parameter"); | |
561 | if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE) { | |
562 | printk(KERN_WARNING "wdrtas: couldn't get token for " | |
563 | "ibm,get-system-parameter. Trying to continue with " | |
564 | "a default timeout value of %i seconds.\n", | |
565 | WDRTAS_DEFAULT_INTERVAL); | |
566 | } | |
567 | ||
568 | wdrtas_token_set_indicator = rtas_token("set-indicator"); | |
569 | if (wdrtas_token_set_indicator == RTAS_UNKNOWN_SERVICE) { | |
570 | printk(KERN_ERR "wdrtas: couldn't get token for " | |
571 | "set-indicator. Terminating watchdog code.\n"); | |
572 | return -EIO; | |
573 | } | |
574 | ||
575 | wdrtas_token_event_scan = rtas_token("event-scan"); | |
576 | if (wdrtas_token_event_scan == RTAS_UNKNOWN_SERVICE) { | |
577 | printk(KERN_ERR "wdrtas: couldn't get token for event-scan. " | |
578 | "Terminating watchdog code.\n"); | |
579 | return -EIO; | |
580 | } | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
585 | /** | |
586 | * wdrtas_unregister_devs - unregisters the misc dev handlers | |
587 | * | |
588 | * wdrtas_register_devs unregisters the watchdog and temperature watchdog | |
589 | * misc devs | |
590 | */ | |
dae67a28 | 591 | static void wdrtas_unregister_devs(void) |
031f7ede UB |
592 | { |
593 | misc_deregister(&wdrtas_miscdev); | |
594 | if (wdrtas_token_get_sensor_state != RTAS_UNKNOWN_SERVICE) | |
595 | misc_deregister(&wdrtas_tempdev); | |
596 | } | |
597 | ||
598 | /** | |
599 | * wdrtas_register_devs - registers the misc dev handlers | |
600 | * | |
af901ca1 | 601 | * returns 0 on success, <0 on failure |
031f7ede UB |
602 | * |
603 | * wdrtas_register_devs registers the watchdog and temperature watchdog | |
604 | * misc devs | |
605 | */ | |
dae67a28 | 606 | static int wdrtas_register_devs(void) |
031f7ede UB |
607 | { |
608 | int result; | |
609 | ||
610 | result = misc_register(&wdrtas_miscdev); | |
611 | if (result) { | |
612 | printk(KERN_ERR "wdrtas: couldn't register watchdog misc " | |
613 | "device. Terminating watchdog code.\n"); | |
614 | return result; | |
615 | } | |
616 | ||
617 | if (wdrtas_token_get_sensor_state != RTAS_UNKNOWN_SERVICE) { | |
618 | result = misc_register(&wdrtas_tempdev); | |
619 | if (result) { | |
620 | printk(KERN_WARNING "wdrtas: couldn't register " | |
621 | "watchdog temperature misc device. Continuing " | |
622 | "without temperature support.\n"); | |
623 | wdrtas_token_get_sensor_state = RTAS_UNKNOWN_SERVICE; | |
624 | } | |
625 | } | |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
630 | /** | |
631 | * wdrtas_init - init function of the watchdog driver | |
632 | * | |
af901ca1 | 633 | * returns 0 on success, <0 on failure |
031f7ede UB |
634 | * |
635 | * registers the file handlers and the reboot notifier | |
636 | */ | |
dae67a28 | 637 | static int __init wdrtas_init(void) |
031f7ede UB |
638 | { |
639 | if (wdrtas_get_tokens()) | |
640 | return -ENODEV; | |
641 | ||
642 | if (wdrtas_register_devs()) | |
643 | return -ENODEV; | |
644 | ||
645 | if (register_reboot_notifier(&wdrtas_notifier)) { | |
646 | printk(KERN_ERR "wdrtas: could not register reboot notifier. " | |
647 | "Terminating watchdog code.\n"); | |
648 | wdrtas_unregister_devs(); | |
649 | return -ENODEV; | |
650 | } | |
651 | ||
652 | if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE) | |
653 | wdrtas_interval = WDRTAS_DEFAULT_INTERVAL; | |
654 | else | |
655 | wdrtas_interval = wdrtas_get_interval(WDRTAS_DEFAULT_INTERVAL); | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | /** | |
661 | * wdrtas_exit - exit function of the watchdog driver | |
662 | * | |
663 | * unregisters the file handlers and the reboot notifier | |
664 | */ | |
dae67a28 | 665 | static void __exit wdrtas_exit(void) |
031f7ede UB |
666 | { |
667 | if (!wdrtas_nowayout) | |
668 | wdrtas_timer_stop(); | |
669 | ||
670 | wdrtas_unregister_devs(); | |
671 | ||
672 | unregister_reboot_notifier(&wdrtas_notifier); | |
673 | } | |
674 | ||
675 | module_init(wdrtas_init); | |
676 | module_exit(wdrtas_exit); |