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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 | ||
27c766aa JP |
29 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
30 | ||
031f7ede UB |
31 | #include <linux/fs.h> |
32 | #include <linux/init.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/miscdevice.h> | |
35 | #include <linux/module.h> | |
36 | #include <linux/notifier.h> | |
37 | #include <linux/reboot.h> | |
38 | #include <linux/types.h> | |
39 | #include <linux/watchdog.h> | |
dae67a28 | 40 | #include <linux/uaccess.h> |
031f7ede UB |
41 | |
42 | #include <asm/rtas.h> | |
031f7ede UB |
43 | |
44 | #define WDRTAS_MAGIC_CHAR 42 | |
45 | #define WDRTAS_SUPPORTED_MASK (WDIOF_SETTIMEOUT | \ | |
46 | WDIOF_MAGICCLOSE) | |
47 | ||
48 | MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>"); | |
49 | MODULE_DESCRIPTION("RTAS watchdog driver"); | |
50 | MODULE_LICENSE("GPL"); | |
51 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
52 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); | |
53 | ||
86a1e189 | 54 | static bool wdrtas_nowayout = WATCHDOG_NOWAYOUT; |
031f7ede | 55 | static atomic_t wdrtas_miscdev_open = ATOMIC_INIT(0); |
dae67a28 | 56 | static char wdrtas_expect_close; |
031f7ede UB |
57 | |
58 | static int wdrtas_interval; | |
59 | ||
60 | #define WDRTAS_THERMAL_SENSOR 3 | |
61 | static int wdrtas_token_get_sensor_state; | |
62 | #define WDRTAS_SURVEILLANCE_IND 9000 | |
63 | static int wdrtas_token_set_indicator; | |
64 | #define WDRTAS_SP_SPI 28 | |
65 | static int wdrtas_token_get_sp; | |
66 | static int wdrtas_token_event_scan; | |
67 | ||
68 | #define WDRTAS_DEFAULT_INTERVAL 300 | |
69 | ||
70 | #define WDRTAS_LOGBUFFER_LEN 128 | |
71 | static char wdrtas_logbuffer[WDRTAS_LOGBUFFER_LEN]; | |
72 | ||
73 | ||
74 | /*** watchdog access functions */ | |
75 | ||
76 | /** | |
77 | * wdrtas_set_interval - sets the watchdog interval | |
78 | * @interval: new interval | |
79 | * | |
80 | * returns 0 on success, <0 on failures | |
81 | * | |
82 | * wdrtas_set_interval sets the watchdog keepalive interval by calling the | |
83 | * RTAS function set-indicator (surveillance). The unit of interval is | |
84 | * seconds. | |
85 | */ | |
dae67a28 AC |
86 | |
87 | static int wdrtas_set_interval(int interval) | |
031f7ede UB |
88 | { |
89 | long result; | |
90 | static int print_msg = 10; | |
91 | ||
92 | /* rtas uses minutes */ | |
93 | interval = (interval + 59) / 60; | |
94 | ||
95 | result = rtas_call(wdrtas_token_set_indicator, 3, 1, NULL, | |
96 | WDRTAS_SURVEILLANCE_IND, 0, interval); | |
dae67a28 | 97 | if (result < 0 && print_msg) { |
27c766aa JP |
98 | pr_err("setting the watchdog to %i timeout failed: %li\n", |
99 | interval, result); | |
031f7ede UB |
100 | print_msg--; |
101 | } | |
102 | ||
103 | return result; | |
104 | } | |
105 | ||
b6966b1b MN |
106 | #define WDRTAS_SP_SPI_LEN 4 |
107 | ||
031f7ede UB |
108 | /** |
109 | * wdrtas_get_interval - returns the current watchdog interval | |
110 | * @fallback_value: value (in seconds) to use, if the RTAS call fails | |
111 | * | |
112 | * returns the interval | |
113 | * | |
114 | * wdrtas_get_interval returns the current watchdog keepalive interval | |
115 | * as reported by the RTAS function ibm,get-system-parameter. The unit | |
116 | * of the return value is seconds. | |
117 | */ | |
dae67a28 | 118 | static int wdrtas_get_interval(int fallback_value) |
031f7ede UB |
119 | { |
120 | long result; | |
b6966b1b | 121 | char value[WDRTAS_SP_SPI_LEN]; |
031f7ede | 122 | |
b6966b1b MN |
123 | spin_lock(&rtas_data_buf_lock); |
124 | memset(rtas_data_buf, 0, WDRTAS_SP_SPI_LEN); | |
031f7ede | 125 | result = rtas_call(wdrtas_token_get_sp, 3, 1, NULL, |
b6966b1b MN |
126 | WDRTAS_SP_SPI, __pa(rtas_data_buf), |
127 | WDRTAS_SP_SPI_LEN); | |
128 | ||
129 | memcpy(value, rtas_data_buf, WDRTAS_SP_SPI_LEN); | |
130 | spin_unlock(&rtas_data_buf_lock); | |
131 | ||
dae67a28 | 132 | if (value[0] != 0 || value[1] != 2 || value[3] != 0 || result < 0) { |
27c766aa JP |
133 | pr_warn("could not get sp_spi watchdog timeout (%li). Continuing\n", |
134 | result); | |
031f7ede UB |
135 | return fallback_value; |
136 | } | |
137 | ||
138 | /* rtas uses minutes */ | |
139 | return ((int)value[2]) * 60; | |
140 | } | |
141 | ||
142 | /** | |
143 | * wdrtas_timer_start - starts watchdog | |
144 | * | |
145 | * wdrtas_timer_start starts the watchdog by calling the RTAS function | |
146 | * set-interval (surveillance) | |
147 | */ | |
dae67a28 | 148 | static void wdrtas_timer_start(void) |
031f7ede UB |
149 | { |
150 | wdrtas_set_interval(wdrtas_interval); | |
151 | } | |
152 | ||
153 | /** | |
154 | * wdrtas_timer_stop - stops watchdog | |
155 | * | |
156 | * wdrtas_timer_stop stops the watchdog timer by calling the RTAS function | |
157 | * set-interval (surveillance) | |
158 | */ | |
dae67a28 | 159 | static void wdrtas_timer_stop(void) |
031f7ede UB |
160 | { |
161 | wdrtas_set_interval(0); | |
162 | } | |
163 | ||
164 | /** | |
165 | * wdrtas_log_scanned_event - logs an event we received during keepalive | |
166 | * | |
167 | * wdrtas_log_scanned_event prints a message to the log buffer dumping | |
168 | * the results of the last event-scan call | |
169 | */ | |
dae67a28 | 170 | static void wdrtas_log_scanned_event(void) |
031f7ede UB |
171 | { |
172 | int i; | |
173 | ||
174 | for (i = 0; i < WDRTAS_LOGBUFFER_LEN; i += 16) | |
27c766aa JP |
175 | pr_info("dumping event (line %i/%i), data = " |
176 | "%02x %02x %02x %02x %02x %02x %02x %02x " | |
177 | "%02x %02x %02x %02x %02x %02x %02x %02x\n", | |
178 | (i / 16) + 1, (WDRTAS_LOGBUFFER_LEN / 16), | |
179 | wdrtas_logbuffer[i + 0], wdrtas_logbuffer[i + 1], | |
180 | wdrtas_logbuffer[i + 2], wdrtas_logbuffer[i + 3], | |
181 | wdrtas_logbuffer[i + 4], wdrtas_logbuffer[i + 5], | |
182 | wdrtas_logbuffer[i + 6], wdrtas_logbuffer[i + 7], | |
183 | wdrtas_logbuffer[i + 8], wdrtas_logbuffer[i + 9], | |
184 | wdrtas_logbuffer[i + 10], wdrtas_logbuffer[i + 11], | |
185 | wdrtas_logbuffer[i + 12], wdrtas_logbuffer[i + 13], | |
186 | wdrtas_logbuffer[i + 14], wdrtas_logbuffer[i + 15]); | |
031f7ede UB |
187 | } |
188 | ||
189 | /** | |
190 | * wdrtas_timer_keepalive - resets watchdog timer to keep system alive | |
191 | * | |
192 | * wdrtas_timer_keepalive restarts the watchdog timer by calling the | |
193 | * RTAS function event-scan and repeats these calls as long as there are | |
194 | * events available. All events will be dumped. | |
195 | */ | |
dae67a28 | 196 | static void wdrtas_timer_keepalive(void) |
031f7ede UB |
197 | { |
198 | long result; | |
199 | ||
200 | do { | |
201 | result = rtas_call(wdrtas_token_event_scan, 4, 1, NULL, | |
202 | RTAS_EVENT_SCAN_ALL_EVENTS, 0, | |
203 | (void *)__pa(wdrtas_logbuffer), | |
204 | WDRTAS_LOGBUFFER_LEN); | |
205 | if (result < 0) | |
27c766aa | 206 | pr_err("event-scan failed: %li\n", result); |
031f7ede UB |
207 | if (result == 0) |
208 | wdrtas_log_scanned_event(); | |
209 | } while (result == 0); | |
210 | } | |
211 | ||
212 | /** | |
213 | * wdrtas_get_temperature - returns current temperature | |
214 | * | |
215 | * returns temperature or <0 on failures | |
216 | * | |
217 | * wdrtas_get_temperature returns the current temperature in Fahrenheit. It | |
218 | * uses the RTAS call get-sensor-state, token 3 to do so | |
219 | */ | |
dae67a28 | 220 | static int wdrtas_get_temperature(void) |
031f7ede | 221 | { |
5ba762c9 | 222 | int result; |
031f7ede UB |
223 | int temperature = 0; |
224 | ||
5ba762c9 | 225 | result = rtas_get_sensor(WDRTAS_THERMAL_SENSOR, 0, &temperature); |
031f7ede UB |
226 | |
227 | if (result < 0) | |
27c766aa | 228 | pr_warn("reading the thermal sensor 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 { | |
27c766aa | 422 | pr_warn("got unexpected close. Watchdog not stopped.\n"); |
031f7ede UB |
423 | wdrtas_timer_keepalive(); |
424 | } | |
425 | ||
426 | wdrtas_expect_close = 0; | |
427 | atomic_dec(&wdrtas_miscdev_open); | |
428 | return 0; | |
429 | } | |
430 | ||
431 | /** | |
432 | * wdrtas_temp_read - gives back the temperature in fahrenheit | |
433 | * @file: file structure | |
434 | * @buf: user buffer | |
435 | * @count: number of bytes to be read | |
436 | * @ppos: position in file | |
437 | * | |
438 | * returns always 1 or -EFAULT in case of user space copy failures, <0 on | |
439 | * other failures | |
440 | * | |
441 | * wdrtas_temp_read gives the temperature to the users by copying this | |
442 | * value as one byte into the user space buffer. The unit is Fahrenheit... | |
443 | */ | |
dae67a28 | 444 | static ssize_t wdrtas_temp_read(struct file *file, char __user *buf, |
031f7ede UB |
445 | size_t count, loff_t *ppos) |
446 | { | |
447 | int temperature = 0; | |
448 | ||
449 | temperature = wdrtas_get_temperature(); | |
450 | if (temperature < 0) | |
451 | return temperature; | |
452 | ||
453 | if (copy_to_user(buf, &temperature, 1)) | |
454 | return -EFAULT; | |
455 | ||
456 | return 1; | |
457 | } | |
458 | ||
459 | /** | |
460 | * wdrtas_temp_open - open function of temperature device | |
461 | * @inode: inode structure | |
462 | * @file: file structure | |
463 | * | |
464 | * returns 0 on success, <0 on failure | |
465 | * | |
466 | * function called when temperature device is opened | |
467 | */ | |
dae67a28 | 468 | static int wdrtas_temp_open(struct inode *inode, struct file *file) |
031f7ede UB |
469 | { |
470 | return nonseekable_open(inode, file); | |
471 | } | |
472 | ||
473 | /** | |
474 | * wdrtas_temp_close - close function of temperature device | |
475 | * @inode: inode structure | |
476 | * @file: file structure | |
477 | * | |
478 | * returns 0 on success | |
479 | * | |
480 | * close function. Always succeeds | |
481 | */ | |
dae67a28 | 482 | static int wdrtas_temp_close(struct inode *inode, struct file *file) |
031f7ede UB |
483 | { |
484 | return 0; | |
485 | } | |
486 | ||
487 | /** | |
488 | * wdrtas_reboot - reboot notifier function | |
489 | * @nb: notifier block structure | |
490 | * @code: reboot code | |
491 | * @ptr: unused | |
492 | * | |
493 | * returns NOTIFY_DONE | |
494 | * | |
495 | * wdrtas_reboot stops the watchdog in case of a reboot | |
496 | */ | |
dae67a28 AC |
497 | static int wdrtas_reboot(struct notifier_block *this, |
498 | unsigned long code, void *ptr) | |
031f7ede | 499 | { |
dae67a28 | 500 | if (code == SYS_DOWN || code == SYS_HALT) |
031f7ede UB |
501 | wdrtas_timer_stop(); |
502 | ||
503 | return NOTIFY_DONE; | |
504 | } | |
505 | ||
506 | /*** initialization stuff */ | |
507 | ||
62322d25 | 508 | static const struct file_operations wdrtas_fops = { |
031f7ede UB |
509 | .owner = THIS_MODULE, |
510 | .llseek = no_llseek, | |
511 | .write = wdrtas_write, | |
dae67a28 | 512 | .unlocked_ioctl = wdrtas_ioctl, |
031f7ede UB |
513 | .open = wdrtas_open, |
514 | .release = wdrtas_close, | |
515 | }; | |
516 | ||
517 | static struct miscdevice wdrtas_miscdev = { | |
518 | .minor = WATCHDOG_MINOR, | |
519 | .name = "watchdog", | |
520 | .fops = &wdrtas_fops, | |
521 | }; | |
522 | ||
62322d25 | 523 | static const struct file_operations wdrtas_temp_fops = { |
031f7ede UB |
524 | .owner = THIS_MODULE, |
525 | .llseek = no_llseek, | |
526 | .read = wdrtas_temp_read, | |
527 | .open = wdrtas_temp_open, | |
528 | .release = wdrtas_temp_close, | |
529 | }; | |
530 | ||
531 | static struct miscdevice wdrtas_tempdev = { | |
532 | .minor = TEMP_MINOR, | |
533 | .name = "temperature", | |
534 | .fops = &wdrtas_temp_fops, | |
535 | }; | |
536 | ||
537 | static struct notifier_block wdrtas_notifier = { | |
538 | .notifier_call = wdrtas_reboot, | |
539 | }; | |
540 | ||
541 | /** | |
542 | * wdrtas_get_tokens - reads in RTAS tokens | |
543 | * | |
af901ca1 | 544 | * returns 0 on success, <0 on failure |
031f7ede UB |
545 | * |
546 | * wdrtas_get_tokens reads in the tokens for the RTAS calls used in | |
547 | * this watchdog driver. It tolerates, if "get-sensor-state" and | |
548 | * "ibm,get-system-parameter" are not available. | |
549 | */ | |
dae67a28 | 550 | static int wdrtas_get_tokens(void) |
031f7ede UB |
551 | { |
552 | wdrtas_token_get_sensor_state = rtas_token("get-sensor-state"); | |
553 | if (wdrtas_token_get_sensor_state == RTAS_UNKNOWN_SERVICE) { | |
27c766aa | 554 | pr_warn("couldn't get token for get-sensor-state. Trying to continue without temperature support.\n"); |
031f7ede UB |
555 | } |
556 | ||
557 | wdrtas_token_get_sp = rtas_token("ibm,get-system-parameter"); | |
558 | if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE) { | |
27c766aa JP |
559 | pr_warn("couldn't get token for ibm,get-system-parameter. Trying to continue with a default timeout value of %i seconds.\n", |
560 | WDRTAS_DEFAULT_INTERVAL); | |
031f7ede UB |
561 | } |
562 | ||
563 | wdrtas_token_set_indicator = rtas_token("set-indicator"); | |
564 | if (wdrtas_token_set_indicator == RTAS_UNKNOWN_SERVICE) { | |
27c766aa | 565 | pr_err("couldn't get token for set-indicator. Terminating watchdog code.\n"); |
031f7ede UB |
566 | return -EIO; |
567 | } | |
568 | ||
569 | wdrtas_token_event_scan = rtas_token("event-scan"); | |
570 | if (wdrtas_token_event_scan == RTAS_UNKNOWN_SERVICE) { | |
27c766aa | 571 | pr_err("couldn't get token for event-scan. Terminating watchdog code.\n"); |
031f7ede UB |
572 | return -EIO; |
573 | } | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | /** | |
579 | * wdrtas_unregister_devs - unregisters the misc dev handlers | |
580 | * | |
581 | * wdrtas_register_devs unregisters the watchdog and temperature watchdog | |
582 | * misc devs | |
583 | */ | |
dae67a28 | 584 | static void wdrtas_unregister_devs(void) |
031f7ede UB |
585 | { |
586 | misc_deregister(&wdrtas_miscdev); | |
587 | if (wdrtas_token_get_sensor_state != RTAS_UNKNOWN_SERVICE) | |
588 | misc_deregister(&wdrtas_tempdev); | |
589 | } | |
590 | ||
591 | /** | |
592 | * wdrtas_register_devs - registers the misc dev handlers | |
593 | * | |
af901ca1 | 594 | * returns 0 on success, <0 on failure |
031f7ede UB |
595 | * |
596 | * wdrtas_register_devs registers the watchdog and temperature watchdog | |
597 | * misc devs | |
598 | */ | |
dae67a28 | 599 | static int wdrtas_register_devs(void) |
031f7ede UB |
600 | { |
601 | int result; | |
602 | ||
603 | result = misc_register(&wdrtas_miscdev); | |
604 | if (result) { | |
27c766aa | 605 | pr_err("couldn't register watchdog misc device. Terminating watchdog code.\n"); |
031f7ede UB |
606 | return result; |
607 | } | |
608 | ||
609 | if (wdrtas_token_get_sensor_state != RTAS_UNKNOWN_SERVICE) { | |
610 | result = misc_register(&wdrtas_tempdev); | |
611 | if (result) { | |
27c766aa | 612 | pr_warn("couldn't register watchdog temperature misc device. Continuing without temperature support.\n"); |
031f7ede UB |
613 | wdrtas_token_get_sensor_state = RTAS_UNKNOWN_SERVICE; |
614 | } | |
615 | } | |
616 | ||
617 | return 0; | |
618 | } | |
619 | ||
620 | /** | |
621 | * wdrtas_init - init function of the watchdog driver | |
622 | * | |
af901ca1 | 623 | * returns 0 on success, <0 on failure |
031f7ede UB |
624 | * |
625 | * registers the file handlers and the reboot notifier | |
626 | */ | |
dae67a28 | 627 | static int __init wdrtas_init(void) |
031f7ede UB |
628 | { |
629 | if (wdrtas_get_tokens()) | |
630 | return -ENODEV; | |
631 | ||
632 | if (wdrtas_register_devs()) | |
633 | return -ENODEV; | |
634 | ||
635 | if (register_reboot_notifier(&wdrtas_notifier)) { | |
27c766aa | 636 | pr_err("could not register reboot notifier. Terminating watchdog code.\n"); |
031f7ede UB |
637 | wdrtas_unregister_devs(); |
638 | return -ENODEV; | |
639 | } | |
640 | ||
641 | if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE) | |
642 | wdrtas_interval = WDRTAS_DEFAULT_INTERVAL; | |
643 | else | |
644 | wdrtas_interval = wdrtas_get_interval(WDRTAS_DEFAULT_INTERVAL); | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
649 | /** | |
650 | * wdrtas_exit - exit function of the watchdog driver | |
651 | * | |
652 | * unregisters the file handlers and the reboot notifier | |
653 | */ | |
dae67a28 | 654 | static void __exit wdrtas_exit(void) |
031f7ede UB |
655 | { |
656 | if (!wdrtas_nowayout) | |
657 | wdrtas_timer_stop(); | |
658 | ||
659 | wdrtas_unregister_devs(); | |
660 | ||
661 | unregister_reboot_notifier(&wdrtas_notifier); | |
662 | } | |
663 | ||
664 | module_init(wdrtas_init); | |
665 | module_exit(wdrtas_exit); |