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1da177e4 LT |
1 | /* |
2 | * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $) | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or (at | |
12 | * your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
22 | * | |
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
24 | * | |
25 | * This driver fully implements the ACPI thermal policy as described in the | |
26 | * ACPI 2.0 Specification. | |
27 | * | |
28 | * TBD: 1. Implement passive cooling hysteresis. | |
29 | * 2. Enhance passive cooling (CPU) states/limit interface to support | |
30 | * concepts of 'multiple limiters', upper/lower limits, etc. | |
31 | * | |
32 | */ | |
33 | ||
34 | #include <linux/kernel.h> | |
35 | #include <linux/module.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/types.h> | |
38 | #include <linux/proc_fs.h> | |
39 | #include <linux/sched.h> | |
40 | #include <linux/kmod.h> | |
41 | #include <linux/seq_file.h> | |
42 | #include <asm/uaccess.h> | |
43 | ||
44 | #include <acpi/acpi_bus.h> | |
45 | #include <acpi/acpi_drivers.h> | |
46 | ||
47 | #define ACPI_THERMAL_COMPONENT 0x04000000 | |
48 | #define ACPI_THERMAL_CLASS "thermal_zone" | |
49 | #define ACPI_THERMAL_DRIVER_NAME "ACPI Thermal Zone Driver" | |
50 | #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone" | |
51 | #define ACPI_THERMAL_FILE_STATE "state" | |
52 | #define ACPI_THERMAL_FILE_TEMPERATURE "temperature" | |
53 | #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points" | |
54 | #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode" | |
55 | #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency" | |
56 | #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80 | |
57 | #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81 | |
58 | #define ACPI_THERMAL_NOTIFY_DEVICES 0x82 | |
59 | #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0 | |
60 | #define ACPI_THERMAL_NOTIFY_HOT 0xF1 | |
61 | #define ACPI_THERMAL_MODE_ACTIVE 0x00 | |
62 | #define ACPI_THERMAL_MODE_PASSIVE 0x01 | |
63 | #define ACPI_THERMAL_MODE_CRITICAL 0xff | |
64 | #define ACPI_THERMAL_PATH_POWEROFF "/sbin/poweroff" | |
65 | ||
66 | #define ACPI_THERMAL_MAX_ACTIVE 10 | |
67 | #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65 | |
68 | ||
69 | #define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10) | |
70 | #define CELSIUS_TO_KELVIN(t) ((t+273)*10) | |
71 | ||
72 | #define _COMPONENT ACPI_THERMAL_COMPONENT | |
4be44fcd | 73 | ACPI_MODULE_NAME("acpi_thermal") |
1da177e4 | 74 | |
1cbf4c56 | 75 | MODULE_AUTHOR("Paul Diefenbaugh"); |
1da177e4 LT |
76 | MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME); |
77 | MODULE_LICENSE("GPL"); | |
78 | ||
79 | static int tzp; | |
80 | module_param(tzp, int, 0); | |
81 | MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n"); | |
82 | ||
4be44fcd LB |
83 | static int acpi_thermal_add(struct acpi_device *device); |
84 | static int acpi_thermal_remove(struct acpi_device *device, int type); | |
74ce1468 | 85 | static int acpi_thermal_resume(struct acpi_device *device, int state); |
1da177e4 LT |
86 | static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file); |
87 | static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file); | |
88 | static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file); | |
4be44fcd LB |
89 | static ssize_t acpi_thermal_write_trip_points(struct file *, |
90 | const char __user *, size_t, | |
91 | loff_t *); | |
1da177e4 | 92 | static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file); |
4be44fcd LB |
93 | static ssize_t acpi_thermal_write_cooling_mode(struct file *, |
94 | const char __user *, size_t, | |
95 | loff_t *); | |
1da177e4 | 96 | static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file); |
4be44fcd LB |
97 | static ssize_t acpi_thermal_write_polling(struct file *, const char __user *, |
98 | size_t, loff_t *); | |
1da177e4 LT |
99 | |
100 | static struct acpi_driver acpi_thermal_driver = { | |
4be44fcd LB |
101 | .name = ACPI_THERMAL_DRIVER_NAME, |
102 | .class = ACPI_THERMAL_CLASS, | |
103 | .ids = ACPI_THERMAL_HID, | |
104 | .ops = { | |
105 | .add = acpi_thermal_add, | |
106 | .remove = acpi_thermal_remove, | |
74ce1468 | 107 | .resume = acpi_thermal_resume, |
4be44fcd | 108 | }, |
1da177e4 LT |
109 | }; |
110 | ||
111 | struct acpi_thermal_state { | |
4be44fcd LB |
112 | u8 critical:1; |
113 | u8 hot:1; | |
114 | u8 passive:1; | |
115 | u8 active:1; | |
116 | u8 reserved:4; | |
117 | int active_index; | |
1da177e4 LT |
118 | }; |
119 | ||
120 | struct acpi_thermal_state_flags { | |
4be44fcd LB |
121 | u8 valid:1; |
122 | u8 enabled:1; | |
123 | u8 reserved:6; | |
1da177e4 LT |
124 | }; |
125 | ||
126 | struct acpi_thermal_critical { | |
127 | struct acpi_thermal_state_flags flags; | |
4be44fcd | 128 | unsigned long temperature; |
1da177e4 LT |
129 | }; |
130 | ||
131 | struct acpi_thermal_hot { | |
132 | struct acpi_thermal_state_flags flags; | |
4be44fcd | 133 | unsigned long temperature; |
1da177e4 LT |
134 | }; |
135 | ||
136 | struct acpi_thermal_passive { | |
137 | struct acpi_thermal_state_flags flags; | |
4be44fcd LB |
138 | unsigned long temperature; |
139 | unsigned long tc1; | |
140 | unsigned long tc2; | |
141 | unsigned long tsp; | |
142 | struct acpi_handle_list devices; | |
1da177e4 LT |
143 | }; |
144 | ||
145 | struct acpi_thermal_active { | |
146 | struct acpi_thermal_state_flags flags; | |
4be44fcd LB |
147 | unsigned long temperature; |
148 | struct acpi_handle_list devices; | |
1da177e4 LT |
149 | }; |
150 | ||
151 | struct acpi_thermal_trips { | |
152 | struct acpi_thermal_critical critical; | |
4be44fcd | 153 | struct acpi_thermal_hot hot; |
1da177e4 LT |
154 | struct acpi_thermal_passive passive; |
155 | struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE]; | |
156 | }; | |
157 | ||
158 | struct acpi_thermal_flags { | |
4be44fcd LB |
159 | u8 cooling_mode:1; /* _SCP */ |
160 | u8 devices:1; /* _TZD */ | |
161 | u8 reserved:6; | |
1da177e4 LT |
162 | }; |
163 | ||
164 | struct acpi_thermal { | |
4be44fcd LB |
165 | acpi_handle handle; |
166 | acpi_bus_id name; | |
167 | unsigned long temperature; | |
168 | unsigned long last_temperature; | |
169 | unsigned long polling_frequency; | |
170 | u8 cooling_mode; | |
171 | volatile u8 zombie; | |
1da177e4 LT |
172 | struct acpi_thermal_flags flags; |
173 | struct acpi_thermal_state state; | |
174 | struct acpi_thermal_trips trips; | |
4be44fcd LB |
175 | struct acpi_handle_list devices; |
176 | struct timer_list timer; | |
1da177e4 LT |
177 | }; |
178 | ||
179 | static struct file_operations acpi_thermal_state_fops = { | |
4be44fcd LB |
180 | .open = acpi_thermal_state_open_fs, |
181 | .read = seq_read, | |
182 | .llseek = seq_lseek, | |
183 | .release = single_release, | |
1da177e4 LT |
184 | }; |
185 | ||
186 | static struct file_operations acpi_thermal_temp_fops = { | |
4be44fcd LB |
187 | .open = acpi_thermal_temp_open_fs, |
188 | .read = seq_read, | |
189 | .llseek = seq_lseek, | |
190 | .release = single_release, | |
1da177e4 LT |
191 | }; |
192 | ||
193 | static struct file_operations acpi_thermal_trip_fops = { | |
4be44fcd LB |
194 | .open = acpi_thermal_trip_open_fs, |
195 | .read = seq_read, | |
196 | .write = acpi_thermal_write_trip_points, | |
197 | .llseek = seq_lseek, | |
198 | .release = single_release, | |
1da177e4 LT |
199 | }; |
200 | ||
201 | static struct file_operations acpi_thermal_cooling_fops = { | |
4be44fcd LB |
202 | .open = acpi_thermal_cooling_open_fs, |
203 | .read = seq_read, | |
204 | .write = acpi_thermal_write_cooling_mode, | |
205 | .llseek = seq_lseek, | |
206 | .release = single_release, | |
1da177e4 LT |
207 | }; |
208 | ||
209 | static struct file_operations acpi_thermal_polling_fops = { | |
4be44fcd LB |
210 | .open = acpi_thermal_polling_open_fs, |
211 | .read = seq_read, | |
212 | .write = acpi_thermal_write_polling, | |
213 | .llseek = seq_lseek, | |
214 | .release = single_release, | |
1da177e4 LT |
215 | }; |
216 | ||
217 | /* -------------------------------------------------------------------------- | |
218 | Thermal Zone Management | |
219 | -------------------------------------------------------------------------- */ | |
220 | ||
4be44fcd | 221 | static int acpi_thermal_get_temperature(struct acpi_thermal *tz) |
1da177e4 | 222 | { |
4be44fcd | 223 | acpi_status status = AE_OK; |
1da177e4 LT |
224 | |
225 | ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature"); | |
226 | ||
227 | if (!tz) | |
228 | return_VALUE(-EINVAL); | |
229 | ||
230 | tz->last_temperature = tz->temperature; | |
231 | ||
4be44fcd LB |
232 | status = |
233 | acpi_evaluate_integer(tz->handle, "_TMP", NULL, &tz->temperature); | |
1da177e4 LT |
234 | if (ACPI_FAILURE(status)) |
235 | return_VALUE(-ENODEV); | |
236 | ||
4be44fcd LB |
237 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", |
238 | tz->temperature)); | |
1da177e4 LT |
239 | |
240 | return_VALUE(0); | |
241 | } | |
242 | ||
4be44fcd | 243 | static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz) |
1da177e4 | 244 | { |
4be44fcd | 245 | acpi_status status = AE_OK; |
1da177e4 LT |
246 | |
247 | ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency"); | |
248 | ||
249 | if (!tz) | |
250 | return_VALUE(-EINVAL); | |
251 | ||
4be44fcd LB |
252 | status = |
253 | acpi_evaluate_integer(tz->handle, "_TZP", NULL, | |
254 | &tz->polling_frequency); | |
1da177e4 LT |
255 | if (ACPI_FAILURE(status)) |
256 | return_VALUE(-ENODEV); | |
257 | ||
4be44fcd LB |
258 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", |
259 | tz->polling_frequency)); | |
1da177e4 LT |
260 | |
261 | return_VALUE(0); | |
262 | } | |
263 | ||
4be44fcd | 264 | static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds) |
1da177e4 LT |
265 | { |
266 | ACPI_FUNCTION_TRACE("acpi_thermal_set_polling"); | |
267 | ||
268 | if (!tz) | |
269 | return_VALUE(-EINVAL); | |
270 | ||
271 | tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */ | |
272 | ||
4be44fcd LB |
273 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
274 | "Polling frequency set to %lu seconds\n", | |
275 | tz->polling_frequency)); | |
1da177e4 LT |
276 | |
277 | return_VALUE(0); | |
278 | } | |
279 | ||
4be44fcd | 280 | static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode) |
1da177e4 | 281 | { |
4be44fcd LB |
282 | acpi_status status = AE_OK; |
283 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
284 | struct acpi_object_list arg_list = { 1, &arg0 }; | |
285 | acpi_handle handle = NULL; | |
1da177e4 LT |
286 | |
287 | ACPI_FUNCTION_TRACE("acpi_thermal_set_cooling_mode"); | |
288 | ||
289 | if (!tz) | |
290 | return_VALUE(-EINVAL); | |
291 | ||
292 | status = acpi_get_handle(tz->handle, "_SCP", &handle); | |
293 | if (ACPI_FAILURE(status)) { | |
294 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n")); | |
295 | return_VALUE(-ENODEV); | |
296 | } | |
297 | ||
298 | arg0.integer.value = mode; | |
299 | ||
300 | status = acpi_evaluate_object(handle, NULL, &arg_list, NULL); | |
301 | if (ACPI_FAILURE(status)) | |
302 | return_VALUE(-ENODEV); | |
303 | ||
304 | tz->cooling_mode = mode; | |
305 | ||
4be44fcd LB |
306 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n", |
307 | mode ? "passive" : "active")); | |
1da177e4 LT |
308 | |
309 | return_VALUE(0); | |
310 | } | |
311 | ||
4be44fcd | 312 | static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) |
1da177e4 | 313 | { |
4be44fcd LB |
314 | acpi_status status = AE_OK; |
315 | int i = 0; | |
1da177e4 LT |
316 | |
317 | ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points"); | |
318 | ||
319 | if (!tz) | |
320 | return_VALUE(-EINVAL); | |
321 | ||
322 | /* Critical Shutdown (required) */ | |
323 | ||
4be44fcd LB |
324 | status = acpi_evaluate_integer(tz->handle, "_CRT", NULL, |
325 | &tz->trips.critical.temperature); | |
1da177e4 LT |
326 | if (ACPI_FAILURE(status)) { |
327 | tz->trips.critical.flags.valid = 0; | |
328 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No critical threshold\n")); | |
329 | return_VALUE(-ENODEV); | |
4be44fcd | 330 | } else { |
1da177e4 | 331 | tz->trips.critical.flags.valid = 1; |
4be44fcd LB |
332 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
333 | "Found critical threshold [%lu]\n", | |
334 | tz->trips.critical.temperature)); | |
1da177e4 LT |
335 | } |
336 | ||
337 | /* Critical Sleep (optional) */ | |
338 | ||
4be44fcd LB |
339 | status = |
340 | acpi_evaluate_integer(tz->handle, "_HOT", NULL, | |
341 | &tz->trips.hot.temperature); | |
1da177e4 LT |
342 | if (ACPI_FAILURE(status)) { |
343 | tz->trips.hot.flags.valid = 0; | |
344 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n")); | |
4be44fcd | 345 | } else { |
1da177e4 | 346 | tz->trips.hot.flags.valid = 1; |
4be44fcd LB |
347 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n", |
348 | tz->trips.hot.temperature)); | |
1da177e4 LT |
349 | } |
350 | ||
351 | /* Passive: Processors (optional) */ | |
352 | ||
4be44fcd LB |
353 | status = |
354 | acpi_evaluate_integer(tz->handle, "_PSV", NULL, | |
355 | &tz->trips.passive.temperature); | |
1da177e4 LT |
356 | if (ACPI_FAILURE(status)) { |
357 | tz->trips.passive.flags.valid = 0; | |
358 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n")); | |
4be44fcd | 359 | } else { |
1da177e4 LT |
360 | tz->trips.passive.flags.valid = 1; |
361 | ||
4be44fcd LB |
362 | status = |
363 | acpi_evaluate_integer(tz->handle, "_TC1", NULL, | |
364 | &tz->trips.passive.tc1); | |
1da177e4 LT |
365 | if (ACPI_FAILURE(status)) |
366 | tz->trips.passive.flags.valid = 0; | |
367 | ||
4be44fcd LB |
368 | status = |
369 | acpi_evaluate_integer(tz->handle, "_TC2", NULL, | |
370 | &tz->trips.passive.tc2); | |
1da177e4 LT |
371 | if (ACPI_FAILURE(status)) |
372 | tz->trips.passive.flags.valid = 0; | |
373 | ||
4be44fcd LB |
374 | status = |
375 | acpi_evaluate_integer(tz->handle, "_TSP", NULL, | |
376 | &tz->trips.passive.tsp); | |
1da177e4 LT |
377 | if (ACPI_FAILURE(status)) |
378 | tz->trips.passive.flags.valid = 0; | |
379 | ||
4be44fcd LB |
380 | status = |
381 | acpi_evaluate_reference(tz->handle, "_PSL", NULL, | |
382 | &tz->trips.passive.devices); | |
1da177e4 LT |
383 | if (ACPI_FAILURE(status)) |
384 | tz->trips.passive.flags.valid = 0; | |
385 | ||
386 | if (!tz->trips.passive.flags.valid) | |
4be44fcd LB |
387 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, |
388 | "Invalid passive threshold\n")); | |
1da177e4 | 389 | else |
4be44fcd LB |
390 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
391 | "Found passive threshold [%lu]\n", | |
392 | tz->trips.passive.temperature)); | |
1da177e4 LT |
393 | } |
394 | ||
395 | /* Active: Fans, etc. (optional) */ | |
396 | ||
4be44fcd | 397 | for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { |
1da177e4 | 398 | |
4be44fcd | 399 | char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; |
1da177e4 | 400 | |
4be44fcd LB |
401 | status = |
402 | acpi_evaluate_integer(tz->handle, name, NULL, | |
403 | &tz->trips.active[i].temperature); | |
1da177e4 LT |
404 | if (ACPI_FAILURE(status)) |
405 | break; | |
406 | ||
407 | name[2] = 'L'; | |
4be44fcd LB |
408 | status = |
409 | acpi_evaluate_reference(tz->handle, name, NULL, | |
410 | &tz->trips.active[i].devices); | |
1da177e4 LT |
411 | if (ACPI_SUCCESS(status)) { |
412 | tz->trips.active[i].flags.valid = 1; | |
4be44fcd LB |
413 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
414 | "Found active threshold [%d]:[%lu]\n", | |
415 | i, tz->trips.active[i].temperature)); | |
416 | } else | |
417 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
418 | "Invalid active threshold [%d]\n", | |
419 | i)); | |
1da177e4 LT |
420 | } |
421 | ||
422 | return_VALUE(0); | |
423 | } | |
424 | ||
4be44fcd | 425 | static int acpi_thermal_get_devices(struct acpi_thermal *tz) |
1da177e4 | 426 | { |
4be44fcd | 427 | acpi_status status = AE_OK; |
1da177e4 LT |
428 | |
429 | ACPI_FUNCTION_TRACE("acpi_thermal_get_devices"); | |
430 | ||
431 | if (!tz) | |
432 | return_VALUE(-EINVAL); | |
433 | ||
4be44fcd LB |
434 | status = |
435 | acpi_evaluate_reference(tz->handle, "_TZD", NULL, &tz->devices); | |
1da177e4 LT |
436 | if (ACPI_FAILURE(status)) |
437 | return_VALUE(-ENODEV); | |
438 | ||
439 | return_VALUE(0); | |
440 | } | |
441 | ||
4be44fcd | 442 | static int acpi_thermal_call_usermode(char *path) |
1da177e4 | 443 | { |
4be44fcd LB |
444 | char *argv[2] = { NULL, NULL }; |
445 | char *envp[3] = { NULL, NULL, NULL }; | |
1da177e4 LT |
446 | |
447 | ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode"); | |
448 | ||
449 | if (!path) | |
450 | return_VALUE(-EINVAL); | |
451 | ||
452 | argv[0] = path; | |
453 | ||
454 | /* minimal command environment */ | |
455 | envp[0] = "HOME=/"; | |
456 | envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; | |
4be44fcd | 457 | |
1da177e4 LT |
458 | call_usermodehelper(argv[0], argv, envp, 0); |
459 | ||
460 | return_VALUE(0); | |
461 | } | |
462 | ||
4be44fcd | 463 | static int acpi_thermal_critical(struct acpi_thermal *tz) |
1da177e4 | 464 | { |
4be44fcd LB |
465 | int result = 0; |
466 | struct acpi_device *device = NULL; | |
1da177e4 LT |
467 | |
468 | ACPI_FUNCTION_TRACE("acpi_thermal_critical"); | |
469 | ||
470 | if (!tz || !tz->trips.critical.flags.valid) | |
471 | return_VALUE(-EINVAL); | |
472 | ||
473 | if (tz->temperature >= tz->trips.critical.temperature) { | |
474 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Critical trip point\n")); | |
475 | tz->trips.critical.flags.enabled = 1; | |
4be44fcd | 476 | } else if (tz->trips.critical.flags.enabled) |
1da177e4 LT |
477 | tz->trips.critical.flags.enabled = 0; |
478 | ||
479 | result = acpi_bus_get_device(tz->handle, &device); | |
480 | if (result) | |
481 | return_VALUE(result); | |
482 | ||
4be44fcd LB |
483 | printk(KERN_EMERG |
484 | "Critical temperature reached (%ld C), shutting down.\n", | |
485 | KELVIN_TO_CELSIUS(tz->temperature)); | |
486 | acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL, | |
487 | tz->trips.critical.flags.enabled); | |
1da177e4 LT |
488 | |
489 | acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF); | |
490 | ||
491 | return_VALUE(0); | |
492 | } | |
493 | ||
4be44fcd | 494 | static int acpi_thermal_hot(struct acpi_thermal *tz) |
1da177e4 | 495 | { |
4be44fcd LB |
496 | int result = 0; |
497 | struct acpi_device *device = NULL; | |
1da177e4 LT |
498 | |
499 | ACPI_FUNCTION_TRACE("acpi_thermal_hot"); | |
500 | ||
501 | if (!tz || !tz->trips.hot.flags.valid) | |
502 | return_VALUE(-EINVAL); | |
503 | ||
504 | if (tz->temperature >= tz->trips.hot.temperature) { | |
505 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Hot trip point\n")); | |
506 | tz->trips.hot.flags.enabled = 1; | |
4be44fcd | 507 | } else if (tz->trips.hot.flags.enabled) |
1da177e4 LT |
508 | tz->trips.hot.flags.enabled = 0; |
509 | ||
510 | result = acpi_bus_get_device(tz->handle, &device); | |
511 | if (result) | |
512 | return_VALUE(result); | |
513 | ||
4be44fcd LB |
514 | acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT, |
515 | tz->trips.hot.flags.enabled); | |
1da177e4 LT |
516 | |
517 | /* TBD: Call user-mode "sleep(S4)" function */ | |
518 | ||
519 | return_VALUE(0); | |
520 | } | |
521 | ||
1cbf4c56 | 522 | static void acpi_thermal_passive(struct acpi_thermal *tz) |
1da177e4 | 523 | { |
1cbf4c56 | 524 | int result = 1; |
1da177e4 | 525 | struct acpi_thermal_passive *passive = NULL; |
4be44fcd LB |
526 | int trend = 0; |
527 | int i = 0; | |
1da177e4 LT |
528 | |
529 | ACPI_FUNCTION_TRACE("acpi_thermal_passive"); | |
530 | ||
531 | if (!tz || !tz->trips.passive.flags.valid) | |
1cbf4c56 | 532 | return; |
1da177e4 LT |
533 | |
534 | passive = &(tz->trips.passive); | |
535 | ||
536 | /* | |
537 | * Above Trip? | |
538 | * ----------- | |
539 | * Calculate the thermal trend (using the passive cooling equation) | |
540 | * and modify the performance limit for all passive cooling devices | |
541 | * accordingly. Note that we assume symmetry. | |
542 | */ | |
543 | if (tz->temperature >= passive->temperature) { | |
4be44fcd LB |
544 | trend = |
545 | (passive->tc1 * (tz->temperature - tz->last_temperature)) + | |
546 | (passive->tc2 * (tz->temperature - passive->temperature)); | |
547 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
548 | "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n", | |
549 | trend, passive->tc1, tz->temperature, | |
550 | tz->last_temperature, passive->tc2, | |
551 | tz->temperature, passive->temperature)); | |
1cbf4c56 | 552 | passive->flags.enabled = 1; |
1da177e4 LT |
553 | /* Heating up? */ |
554 | if (trend > 0) | |
4be44fcd LB |
555 | for (i = 0; i < passive->devices.count; i++) |
556 | acpi_processor_set_thermal_limit(passive-> | |
557 | devices. | |
558 | handles[i], | |
559 | ACPI_PROCESSOR_LIMIT_INCREMENT); | |
1da177e4 | 560 | /* Cooling off? */ |
1cbf4c56 | 561 | else if (trend < 0) { |
4be44fcd | 562 | for (i = 0; i < passive->devices.count; i++) |
1cbf4c56 TR |
563 | /* |
564 | * assume that we are on highest | |
565 | * freq/lowest thrott and can leave | |
566 | * passive mode, even in error case | |
567 | */ | |
568 | if (!acpi_processor_set_thermal_limit | |
569 | (passive->devices.handles[i], | |
570 | ACPI_PROCESSOR_LIMIT_DECREMENT)) | |
571 | result = 0; | |
572 | /* | |
573 | * Leave cooling mode, even if the temp might | |
574 | * higher than trip point This is because some | |
575 | * machines might have long thermal polling | |
576 | * frequencies (tsp) defined. We will fall back | |
577 | * into passive mode in next cycle (probably quicker) | |
578 | */ | |
579 | if (result) { | |
580 | passive->flags.enabled = 0; | |
581 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
582 | "Disabling passive cooling, still above threshold," | |
583 | " but we are cooling down\n")); | |
584 | } | |
585 | } | |
586 | return; | |
1da177e4 LT |
587 | } |
588 | ||
589 | /* | |
590 | * Below Trip? | |
591 | * ----------- | |
592 | * Implement passive cooling hysteresis to slowly increase performance | |
593 | * and avoid thrashing around the passive trip point. Note that we | |
594 | * assume symmetry. | |
595 | */ | |
1cbf4c56 TR |
596 | if (!passive->flags.enabled) |
597 | return; | |
598 | for (i = 0; i < passive->devices.count; i++) | |
599 | if (!acpi_processor_set_thermal_limit | |
600 | (passive->devices.handles[i], | |
601 | ACPI_PROCESSOR_LIMIT_DECREMENT)) | |
602 | result = 0; | |
603 | if (result) { | |
604 | passive->flags.enabled = 0; | |
605 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
606 | "Disabling passive cooling (zone is cool)\n")); | |
1da177e4 | 607 | } |
1da177e4 LT |
608 | } |
609 | ||
1cbf4c56 | 610 | static void acpi_thermal_active(struct acpi_thermal *tz) |
1da177e4 | 611 | { |
4be44fcd | 612 | int result = 0; |
1da177e4 | 613 | struct acpi_thermal_active *active = NULL; |
4be44fcd LB |
614 | int i = 0; |
615 | int j = 0; | |
616 | unsigned long maxtemp = 0; | |
1da177e4 LT |
617 | |
618 | ACPI_FUNCTION_TRACE("acpi_thermal_active"); | |
619 | ||
620 | if (!tz) | |
1cbf4c56 | 621 | return; |
1da177e4 | 622 | |
4be44fcd | 623 | for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { |
1da177e4 LT |
624 | active = &(tz->trips.active[i]); |
625 | if (!active || !active->flags.valid) | |
626 | break; | |
1da177e4 | 627 | if (tz->temperature >= active->temperature) { |
1cbf4c56 TR |
628 | /* |
629 | * Above Threshold? | |
630 | * ---------------- | |
631 | * If not already enabled, turn ON all cooling devices | |
632 | * associated with this active threshold. | |
633 | */ | |
1da177e4 | 634 | if (active->temperature > maxtemp) |
1cbf4c56 TR |
635 | tz->state.active_index = i; |
636 | maxtemp = active->temperature; | |
637 | if (active->flags.enabled) | |
638 | continue; | |
1da177e4 | 639 | for (j = 0; j < active->devices.count; j++) { |
4be44fcd LB |
640 | result = |
641 | acpi_bus_set_power(active->devices. | |
642 | handles[j], | |
1cbf4c56 | 643 | ACPI_STATE_D0); |
1da177e4 | 644 | if (result) { |
4be44fcd | 645 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, |
1cbf4c56 | 646 | "Unable to turn cooling device [%p] 'on'\n", |
4be44fcd LB |
647 | active->devices. |
648 | handles[j])); | |
1da177e4 LT |
649 | continue; |
650 | } | |
1cbf4c56 | 651 | active->flags.enabled = 1; |
4be44fcd | 652 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1cbf4c56 | 653 | "Cooling device [%p] now 'on'\n", |
4be44fcd | 654 | active->devices.handles[j])); |
1da177e4 | 655 | } |
1cbf4c56 TR |
656 | continue; |
657 | } | |
658 | if (!active->flags.enabled) | |
659 | continue; | |
660 | /* | |
661 | * Below Threshold? | |
662 | * ---------------- | |
663 | * Turn OFF all cooling devices associated with this | |
664 | * threshold. | |
665 | */ | |
666 | for (j = 0; j < active->devices.count; j++) { | |
667 | result = acpi_bus_set_power(active->devices.handles[j], | |
668 | ACPI_STATE_D3); | |
669 | if (result) { | |
670 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, | |
671 | "Unable to turn cooling device [%p] 'off'\n", | |
672 | active->devices.handles[j])); | |
673 | continue; | |
674 | } | |
675 | active->flags.enabled = 0; | |
676 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
677 | "Cooling device [%p] now 'off'\n", | |
678 | active->devices.handles[j])); | |
1da177e4 LT |
679 | } |
680 | } | |
1da177e4 LT |
681 | } |
682 | ||
4be44fcd | 683 | static void acpi_thermal_check(void *context); |
1da177e4 | 684 | |
4be44fcd | 685 | static void acpi_thermal_run(unsigned long data) |
1da177e4 LT |
686 | { |
687 | struct acpi_thermal *tz = (struct acpi_thermal *)data; | |
688 | if (!tz->zombie) | |
b8d35192 | 689 | acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data); |
1da177e4 LT |
690 | } |
691 | ||
4be44fcd | 692 | static void acpi_thermal_check(void *data) |
1da177e4 | 693 | { |
4be44fcd LB |
694 | int result = 0; |
695 | struct acpi_thermal *tz = (struct acpi_thermal *)data; | |
696 | unsigned long sleep_time = 0; | |
697 | int i = 0; | |
1da177e4 LT |
698 | struct acpi_thermal_state state; |
699 | ||
700 | ACPI_FUNCTION_TRACE("acpi_thermal_check"); | |
701 | ||
702 | if (!tz) { | |
703 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n")); | |
704 | return_VOID; | |
705 | } | |
706 | ||
707 | state = tz->state; | |
708 | ||
709 | result = acpi_thermal_get_temperature(tz); | |
710 | if (result) | |
711 | return_VOID; | |
4be44fcd | 712 | |
1da177e4 | 713 | memset(&tz->state, 0, sizeof(tz->state)); |
4be44fcd | 714 | |
1da177e4 LT |
715 | /* |
716 | * Check Trip Points | |
717 | * ----------------- | |
718 | * Compare the current temperature to the trip point values to see | |
719 | * if we've entered one of the thermal policy states. Note that | |
720 | * this function determines when a state is entered, but the | |
721 | * individual policy decides when it is exited (e.g. hysteresis). | |
722 | */ | |
723 | if (tz->trips.critical.flags.valid) | |
4be44fcd LB |
724 | state.critical |= |
725 | (tz->temperature >= tz->trips.critical.temperature); | |
1da177e4 LT |
726 | if (tz->trips.hot.flags.valid) |
727 | state.hot |= (tz->temperature >= tz->trips.hot.temperature); | |
728 | if (tz->trips.passive.flags.valid) | |
4be44fcd LB |
729 | state.passive |= |
730 | (tz->temperature >= tz->trips.passive.temperature); | |
731 | for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) | |
1da177e4 | 732 | if (tz->trips.active[i].flags.valid) |
4be44fcd LB |
733 | state.active |= |
734 | (tz->temperature >= | |
735 | tz->trips.active[i].temperature); | |
1da177e4 LT |
736 | |
737 | /* | |
738 | * Invoke Policy | |
739 | * ------------- | |
740 | * Separated from the above check to allow individual policy to | |
741 | * determine when to exit a given state. | |
742 | */ | |
743 | if (state.critical) | |
744 | acpi_thermal_critical(tz); | |
745 | if (state.hot) | |
746 | acpi_thermal_hot(tz); | |
747 | if (state.passive) | |
748 | acpi_thermal_passive(tz); | |
749 | if (state.active) | |
750 | acpi_thermal_active(tz); | |
751 | ||
752 | /* | |
753 | * Calculate State | |
754 | * --------------- | |
755 | * Again, separated from the above two to allow independent policy | |
756 | * decisions. | |
757 | */ | |
1cbf4c56 TR |
758 | tz->state.critical = tz->trips.critical.flags.enabled; |
759 | tz->state.hot = tz->trips.hot.flags.enabled; | |
760 | tz->state.passive = tz->trips.passive.flags.enabled; | |
761 | tz->state.active = 0; | |
4be44fcd | 762 | for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) |
1cbf4c56 | 763 | tz->state.active |= tz->trips.active[i].flags.enabled; |
1da177e4 LT |
764 | |
765 | /* | |
766 | * Calculate Sleep Time | |
767 | * -------------------- | |
768 | * If we're in the passive state, use _TSP's value. Otherwise | |
769 | * use the default polling frequency (e.g. _TZP). If no polling | |
770 | * frequency is specified then we'll wait forever (at least until | |
771 | * a thermal event occurs). Note that _TSP and _TZD values are | |
772 | * given in 1/10th seconds (we must covert to milliseconds). | |
773 | */ | |
774 | if (tz->state.passive) | |
775 | sleep_time = tz->trips.passive.tsp * 100; | |
776 | else if (tz->polling_frequency > 0) | |
777 | sleep_time = tz->polling_frequency * 100; | |
778 | ||
4be44fcd LB |
779 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n", |
780 | tz->name, tz->temperature, sleep_time)); | |
1da177e4 LT |
781 | |
782 | /* | |
783 | * Schedule Next Poll | |
784 | * ------------------ | |
785 | */ | |
786 | if (!sleep_time) { | |
787 | if (timer_pending(&(tz->timer))) | |
788 | del_timer(&(tz->timer)); | |
4be44fcd | 789 | } else { |
1da177e4 LT |
790 | if (timer_pending(&(tz->timer))) |
791 | mod_timer(&(tz->timer), (HZ * sleep_time) / 1000); | |
792 | else { | |
4be44fcd | 793 | tz->timer.data = (unsigned long)tz; |
1da177e4 LT |
794 | tz->timer.function = acpi_thermal_run; |
795 | tz->timer.expires = jiffies + (HZ * sleep_time) / 1000; | |
796 | add_timer(&(tz->timer)); | |
797 | } | |
798 | } | |
799 | ||
800 | return_VOID; | |
801 | } | |
802 | ||
1da177e4 LT |
803 | /* -------------------------------------------------------------------------- |
804 | FS Interface (/proc) | |
805 | -------------------------------------------------------------------------- */ | |
806 | ||
4be44fcd | 807 | static struct proc_dir_entry *acpi_thermal_dir; |
1da177e4 LT |
808 | |
809 | static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset) | |
810 | { | |
4be44fcd | 811 | struct acpi_thermal *tz = (struct acpi_thermal *)seq->private; |
1da177e4 LT |
812 | |
813 | ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show"); | |
814 | ||
815 | if (!tz) | |
816 | goto end; | |
817 | ||
818 | seq_puts(seq, "state: "); | |
819 | ||
4be44fcd LB |
820 | if (!tz->state.critical && !tz->state.hot && !tz->state.passive |
821 | && !tz->state.active) | |
1da177e4 LT |
822 | seq_puts(seq, "ok\n"); |
823 | else { | |
824 | if (tz->state.critical) | |
825 | seq_puts(seq, "critical "); | |
826 | if (tz->state.hot) | |
827 | seq_puts(seq, "hot "); | |
828 | if (tz->state.passive) | |
829 | seq_puts(seq, "passive "); | |
830 | if (tz->state.active) | |
831 | seq_printf(seq, "active[%d]", tz->state.active_index); | |
832 | seq_puts(seq, "\n"); | |
833 | } | |
834 | ||
4be44fcd | 835 | end: |
1da177e4 LT |
836 | return_VALUE(0); |
837 | } | |
838 | ||
839 | static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file) | |
840 | { | |
841 | return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data); | |
842 | } | |
843 | ||
1da177e4 LT |
844 | static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset) |
845 | { | |
4be44fcd LB |
846 | int result = 0; |
847 | struct acpi_thermal *tz = (struct acpi_thermal *)seq->private; | |
1da177e4 LT |
848 | |
849 | ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show"); | |
850 | ||
851 | if (!tz) | |
852 | goto end; | |
853 | ||
854 | result = acpi_thermal_get_temperature(tz); | |
855 | if (result) | |
856 | goto end; | |
857 | ||
4be44fcd LB |
858 | seq_printf(seq, "temperature: %ld C\n", |
859 | KELVIN_TO_CELSIUS(tz->temperature)); | |
1da177e4 | 860 | |
4be44fcd | 861 | end: |
1da177e4 LT |
862 | return_VALUE(0); |
863 | } | |
864 | ||
865 | static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file) | |
866 | { | |
867 | return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data); | |
868 | } | |
869 | ||
1da177e4 LT |
870 | static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset) |
871 | { | |
4be44fcd LB |
872 | struct acpi_thermal *tz = (struct acpi_thermal *)seq->private; |
873 | int i = 0; | |
874 | int j = 0; | |
1da177e4 LT |
875 | |
876 | ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show"); | |
877 | ||
878 | if (!tz) | |
879 | goto end; | |
880 | ||
881 | if (tz->trips.critical.flags.valid) | |
882 | seq_printf(seq, "critical (S5): %ld C\n", | |
4be44fcd | 883 | KELVIN_TO_CELSIUS(tz->trips.critical.temperature)); |
1da177e4 LT |
884 | |
885 | if (tz->trips.hot.flags.valid) | |
886 | seq_printf(seq, "hot (S4): %ld C\n", | |
4be44fcd | 887 | KELVIN_TO_CELSIUS(tz->trips.hot.temperature)); |
1da177e4 LT |
888 | |
889 | if (tz->trips.passive.flags.valid) { | |
4be44fcd LB |
890 | seq_printf(seq, |
891 | "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=", | |
892 | KELVIN_TO_CELSIUS(tz->trips.passive.temperature), | |
893 | tz->trips.passive.tc1, tz->trips.passive.tc2, | |
894 | tz->trips.passive.tsp); | |
895 | for (j = 0; j < tz->trips.passive.devices.count; j++) { | |
896 | ||
897 | seq_printf(seq, "0x%p ", | |
898 | tz->trips.passive.devices.handles[j]); | |
1da177e4 LT |
899 | } |
900 | seq_puts(seq, "\n"); | |
901 | } | |
902 | ||
903 | for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { | |
904 | if (!(tz->trips.active[i].flags.valid)) | |
905 | break; | |
906 | seq_printf(seq, "active[%d]: %ld C: devices=", | |
4be44fcd LB |
907 | i, |
908 | KELVIN_TO_CELSIUS(tz->trips.active[i].temperature)); | |
909 | for (j = 0; j < tz->trips.active[i].devices.count; j++) | |
1da177e4 | 910 | seq_printf(seq, "0x%p ", |
4be44fcd | 911 | tz->trips.active[i].devices.handles[j]); |
1da177e4 LT |
912 | seq_puts(seq, "\n"); |
913 | } | |
914 | ||
4be44fcd | 915 | end: |
1da177e4 LT |
916 | return_VALUE(0); |
917 | } | |
918 | ||
919 | static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file) | |
920 | { | |
921 | return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data); | |
922 | } | |
923 | ||
924 | static ssize_t | |
4be44fcd LB |
925 | acpi_thermal_write_trip_points(struct file *file, |
926 | const char __user * buffer, | |
927 | size_t count, loff_t * ppos) | |
1da177e4 | 928 | { |
4be44fcd LB |
929 | struct seq_file *m = (struct seq_file *)file->private_data; |
930 | struct acpi_thermal *tz = (struct acpi_thermal *)m->private; | |
1da177e4 | 931 | |
4be44fcd LB |
932 | char *limit_string; |
933 | int num, critical, hot, passive; | |
934 | int *active; | |
935 | int i = 0; | |
1da177e4 LT |
936 | |
937 | ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points"); | |
938 | ||
939 | limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL); | |
4be44fcd | 940 | if (!limit_string) |
1da177e4 LT |
941 | return_VALUE(-ENOMEM); |
942 | ||
943 | memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN); | |
944 | ||
4be44fcd | 945 | active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL); |
fdc136cc DJ |
946 | if (!active) { |
947 | kfree(limit_string); | |
1da177e4 | 948 | return_VALUE(-ENOMEM); |
fdc136cc | 949 | } |
1da177e4 LT |
950 | |
951 | if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) { | |
952 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n")); | |
953 | count = -EINVAL; | |
954 | goto end; | |
955 | } | |
4be44fcd | 956 | |
1da177e4 LT |
957 | if (copy_from_user(limit_string, buffer, count)) { |
958 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n")); | |
959 | count = -EFAULT; | |
960 | goto end; | |
961 | } | |
4be44fcd | 962 | |
1da177e4 LT |
963 | limit_string[count] = '\0'; |
964 | ||
965 | num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d", | |
4be44fcd LB |
966 | &critical, &hot, &passive, |
967 | &active[0], &active[1], &active[2], &active[3], &active[4], | |
968 | &active[5], &active[6], &active[7], &active[8], | |
969 | &active[9]); | |
970 | if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) { | |
1da177e4 LT |
971 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n")); |
972 | count = -EINVAL; | |
973 | goto end; | |
974 | } | |
975 | ||
976 | tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical); | |
977 | tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot); | |
978 | tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive); | |
979 | for (i = 0; i < num - 3; i++) { | |
980 | if (!(tz->trips.active[i].flags.valid)) | |
981 | break; | |
982 | tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]); | |
983 | } | |
4be44fcd LB |
984 | |
985 | end: | |
1da177e4 LT |
986 | kfree(active); |
987 | kfree(limit_string); | |
988 | return_VALUE(count); | |
989 | } | |
990 | ||
1da177e4 LT |
991 | static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset) |
992 | { | |
4be44fcd | 993 | struct acpi_thermal *tz = (struct acpi_thermal *)seq->private; |
1da177e4 LT |
994 | |
995 | ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show"); | |
996 | ||
997 | if (!tz) | |
998 | goto end; | |
999 | ||
1000 | if (!tz->flags.cooling_mode) { | |
1001 | seq_puts(seq, "<setting not supported>\n"); | |
1002 | } | |
1003 | ||
4be44fcd | 1004 | if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL) |
1da177e4 LT |
1005 | seq_printf(seq, "cooling mode: critical\n"); |
1006 | else | |
1007 | seq_printf(seq, "cooling mode: %s\n", | |
4be44fcd | 1008 | tz->cooling_mode ? "passive" : "active"); |
1da177e4 | 1009 | |
4be44fcd | 1010 | end: |
1da177e4 LT |
1011 | return_VALUE(0); |
1012 | } | |
1013 | ||
1014 | static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file) | |
1015 | { | |
1016 | return single_open(file, acpi_thermal_cooling_seq_show, | |
4be44fcd | 1017 | PDE(inode)->data); |
1da177e4 LT |
1018 | } |
1019 | ||
1020 | static ssize_t | |
4be44fcd LB |
1021 | acpi_thermal_write_cooling_mode(struct file *file, |
1022 | const char __user * buffer, | |
1023 | size_t count, loff_t * ppos) | |
1da177e4 | 1024 | { |
4be44fcd LB |
1025 | struct seq_file *m = (struct seq_file *)file->private_data; |
1026 | struct acpi_thermal *tz = (struct acpi_thermal *)m->private; | |
1027 | int result = 0; | |
1028 | char mode_string[12] = { '\0' }; | |
1da177e4 LT |
1029 | |
1030 | ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode"); | |
1031 | ||
1032 | if (!tz || (count > sizeof(mode_string) - 1)) | |
1033 | return_VALUE(-EINVAL); | |
1034 | ||
1035 | if (!tz->flags.cooling_mode) | |
1036 | return_VALUE(-ENODEV); | |
1037 | ||
1038 | if (copy_from_user(mode_string, buffer, count)) | |
1039 | return_VALUE(-EFAULT); | |
4be44fcd | 1040 | |
1da177e4 | 1041 | mode_string[count] = '\0'; |
4be44fcd LB |
1042 | |
1043 | result = acpi_thermal_set_cooling_mode(tz, | |
1044 | simple_strtoul(mode_string, NULL, | |
1045 | 0)); | |
1da177e4 LT |
1046 | if (result) |
1047 | return_VALUE(result); | |
1048 | ||
1049 | acpi_thermal_check(tz); | |
1050 | ||
1051 | return_VALUE(count); | |
1052 | } | |
1053 | ||
1da177e4 LT |
1054 | static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset) |
1055 | { | |
4be44fcd | 1056 | struct acpi_thermal *tz = (struct acpi_thermal *)seq->private; |
1da177e4 LT |
1057 | |
1058 | ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show"); | |
1059 | ||
1060 | if (!tz) | |
1061 | goto end; | |
1062 | ||
1063 | if (!tz->polling_frequency) { | |
1064 | seq_puts(seq, "<polling disabled>\n"); | |
1065 | goto end; | |
1066 | } | |
1067 | ||
1068 | seq_printf(seq, "polling frequency: %lu seconds\n", | |
4be44fcd | 1069 | (tz->polling_frequency / 10)); |
1da177e4 | 1070 | |
4be44fcd | 1071 | end: |
1da177e4 LT |
1072 | return_VALUE(0); |
1073 | } | |
1074 | ||
1075 | static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file) | |
1076 | { | |
1077 | return single_open(file, acpi_thermal_polling_seq_show, | |
4be44fcd | 1078 | PDE(inode)->data); |
1da177e4 LT |
1079 | } |
1080 | ||
1081 | static ssize_t | |
4be44fcd LB |
1082 | acpi_thermal_write_polling(struct file *file, |
1083 | const char __user * buffer, | |
1084 | size_t count, loff_t * ppos) | |
1da177e4 | 1085 | { |
4be44fcd LB |
1086 | struct seq_file *m = (struct seq_file *)file->private_data; |
1087 | struct acpi_thermal *tz = (struct acpi_thermal *)m->private; | |
1088 | int result = 0; | |
1089 | char polling_string[12] = { '\0' }; | |
1090 | int seconds = 0; | |
1da177e4 LT |
1091 | |
1092 | ACPI_FUNCTION_TRACE("acpi_thermal_write_polling"); | |
1093 | ||
1094 | if (!tz || (count > sizeof(polling_string) - 1)) | |
1095 | return_VALUE(-EINVAL); | |
4be44fcd | 1096 | |
1da177e4 LT |
1097 | if (copy_from_user(polling_string, buffer, count)) |
1098 | return_VALUE(-EFAULT); | |
4be44fcd | 1099 | |
1da177e4 LT |
1100 | polling_string[count] = '\0'; |
1101 | ||
1102 | seconds = simple_strtoul(polling_string, NULL, 0); | |
4be44fcd | 1103 | |
1da177e4 LT |
1104 | result = acpi_thermal_set_polling(tz, seconds); |
1105 | if (result) | |
1106 | return_VALUE(result); | |
1107 | ||
1108 | acpi_thermal_check(tz); | |
1109 | ||
1110 | return_VALUE(count); | |
1111 | } | |
1112 | ||
4be44fcd | 1113 | static int acpi_thermal_add_fs(struct acpi_device *device) |
1da177e4 | 1114 | { |
4be44fcd | 1115 | struct proc_dir_entry *entry = NULL; |
1da177e4 LT |
1116 | |
1117 | ACPI_FUNCTION_TRACE("acpi_thermal_add_fs"); | |
1118 | ||
1119 | if (!acpi_device_dir(device)) { | |
1120 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 1121 | acpi_thermal_dir); |
1da177e4 LT |
1122 | if (!acpi_device_dir(device)) |
1123 | return_VALUE(-ENODEV); | |
1124 | acpi_device_dir(device)->owner = THIS_MODULE; | |
1125 | } | |
1126 | ||
1127 | /* 'state' [R] */ | |
1128 | entry = create_proc_entry(ACPI_THERMAL_FILE_STATE, | |
4be44fcd | 1129 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 LT |
1130 | if (!entry) |
1131 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
1132 | "Unable to create '%s' fs entry\n", |
1133 | ACPI_THERMAL_FILE_STATE)); | |
1da177e4 LT |
1134 | else { |
1135 | entry->proc_fops = &acpi_thermal_state_fops; | |
1136 | entry->data = acpi_driver_data(device); | |
1137 | entry->owner = THIS_MODULE; | |
1138 | } | |
1139 | ||
1140 | /* 'temperature' [R] */ | |
1141 | entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE, | |
4be44fcd | 1142 | S_IRUGO, acpi_device_dir(device)); |
1da177e4 LT |
1143 | if (!entry) |
1144 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
1145 | "Unable to create '%s' fs entry\n", |
1146 | ACPI_THERMAL_FILE_TEMPERATURE)); | |
1da177e4 LT |
1147 | else { |
1148 | entry->proc_fops = &acpi_thermal_temp_fops; | |
1149 | entry->data = acpi_driver_data(device); | |
1150 | entry->owner = THIS_MODULE; | |
1151 | } | |
1152 | ||
1153 | /* 'trip_points' [R/W] */ | |
1154 | entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS, | |
4be44fcd LB |
1155 | S_IFREG | S_IRUGO | S_IWUSR, |
1156 | acpi_device_dir(device)); | |
1da177e4 LT |
1157 | if (!entry) |
1158 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
1159 | "Unable to create '%s' fs entry\n", |
1160 | ACPI_THERMAL_FILE_TRIP_POINTS)); | |
1da177e4 LT |
1161 | else { |
1162 | entry->proc_fops = &acpi_thermal_trip_fops; | |
1163 | entry->data = acpi_driver_data(device); | |
1164 | entry->owner = THIS_MODULE; | |
1165 | } | |
1166 | ||
1167 | /* 'cooling_mode' [R/W] */ | |
1168 | entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE, | |
4be44fcd LB |
1169 | S_IFREG | S_IRUGO | S_IWUSR, |
1170 | acpi_device_dir(device)); | |
1da177e4 LT |
1171 | if (!entry) |
1172 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
1173 | "Unable to create '%s' fs entry\n", |
1174 | ACPI_THERMAL_FILE_COOLING_MODE)); | |
1da177e4 LT |
1175 | else { |
1176 | entry->proc_fops = &acpi_thermal_cooling_fops; | |
1177 | entry->data = acpi_driver_data(device); | |
1178 | entry->owner = THIS_MODULE; | |
1179 | } | |
1180 | ||
1181 | /* 'polling_frequency' [R/W] */ | |
1182 | entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ, | |
4be44fcd LB |
1183 | S_IFREG | S_IRUGO | S_IWUSR, |
1184 | acpi_device_dir(device)); | |
1da177e4 LT |
1185 | if (!entry) |
1186 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd LB |
1187 | "Unable to create '%s' fs entry\n", |
1188 | ACPI_THERMAL_FILE_POLLING_FREQ)); | |
1da177e4 LT |
1189 | else { |
1190 | entry->proc_fops = &acpi_thermal_polling_fops; | |
1191 | entry->data = acpi_driver_data(device); | |
1192 | entry->owner = THIS_MODULE; | |
1193 | } | |
1194 | ||
1195 | return_VALUE(0); | |
1196 | } | |
1197 | ||
4be44fcd | 1198 | static int acpi_thermal_remove_fs(struct acpi_device *device) |
1da177e4 LT |
1199 | { |
1200 | ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs"); | |
1201 | ||
1202 | if (acpi_device_dir(device)) { | |
1203 | remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ, | |
1204 | acpi_device_dir(device)); | |
1205 | remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE, | |
1206 | acpi_device_dir(device)); | |
1207 | remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS, | |
1208 | acpi_device_dir(device)); | |
1209 | remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE, | |
1210 | acpi_device_dir(device)); | |
1211 | remove_proc_entry(ACPI_THERMAL_FILE_STATE, | |
1212 | acpi_device_dir(device)); | |
1213 | remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir); | |
1214 | acpi_device_dir(device) = NULL; | |
1215 | } | |
1216 | ||
1217 | return_VALUE(0); | |
1218 | } | |
1219 | ||
1da177e4 LT |
1220 | /* -------------------------------------------------------------------------- |
1221 | Driver Interface | |
1222 | -------------------------------------------------------------------------- */ | |
1223 | ||
4be44fcd | 1224 | static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 | 1225 | { |
4be44fcd LB |
1226 | struct acpi_thermal *tz = (struct acpi_thermal *)data; |
1227 | struct acpi_device *device = NULL; | |
1da177e4 LT |
1228 | |
1229 | ACPI_FUNCTION_TRACE("acpi_thermal_notify"); | |
1230 | ||
1231 | if (!tz) | |
1232 | return_VOID; | |
1233 | ||
1234 | if (acpi_bus_get_device(tz->handle, &device)) | |
1235 | return_VOID; | |
1236 | ||
1237 | switch (event) { | |
1238 | case ACPI_THERMAL_NOTIFY_TEMPERATURE: | |
1239 | acpi_thermal_check(tz); | |
1240 | break; | |
1241 | case ACPI_THERMAL_NOTIFY_THRESHOLDS: | |
1242 | acpi_thermal_get_trip_points(tz); | |
1243 | acpi_thermal_check(tz); | |
1244 | acpi_bus_generate_event(device, event, 0); | |
1245 | break; | |
1246 | case ACPI_THERMAL_NOTIFY_DEVICES: | |
1247 | if (tz->flags.devices) | |
1248 | acpi_thermal_get_devices(tz); | |
1249 | acpi_bus_generate_event(device, event, 0); | |
1250 | break; | |
1251 | default: | |
1252 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 1253 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
1254 | break; |
1255 | } | |
1256 | ||
1257 | return_VOID; | |
1258 | } | |
1259 | ||
4be44fcd | 1260 | static int acpi_thermal_get_info(struct acpi_thermal *tz) |
1da177e4 | 1261 | { |
4be44fcd | 1262 | int result = 0; |
1da177e4 LT |
1263 | |
1264 | ACPI_FUNCTION_TRACE("acpi_thermal_get_info"); | |
1265 | ||
1266 | if (!tz) | |
1267 | return_VALUE(-EINVAL); | |
1268 | ||
1269 | /* Get temperature [_TMP] (required) */ | |
1270 | result = acpi_thermal_get_temperature(tz); | |
1271 | if (result) | |
1272 | return_VALUE(result); | |
1273 | ||
1274 | /* Get trip points [_CRT, _PSV, etc.] (required) */ | |
1275 | result = acpi_thermal_get_trip_points(tz); | |
1276 | if (result) | |
1277 | return_VALUE(result); | |
1278 | ||
1279 | /* Set the cooling mode [_SCP] to active cooling (default) */ | |
1280 | result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); | |
4be44fcd | 1281 | if (!result) |
1da177e4 | 1282 | tz->flags.cooling_mode = 1; |
4be44fcd | 1283 | else { |
1da177e4 | 1284 | /* Oh,we have not _SCP method. |
4be44fcd | 1285 | Generally show cooling_mode by _ACx, _PSV,spec 12.2 */ |
1da177e4 | 1286 | tz->flags.cooling_mode = 0; |
4be44fcd LB |
1287 | if (tz->trips.active[0].flags.valid |
1288 | && tz->trips.passive.flags.valid) { | |
1289 | if (tz->trips.passive.temperature > | |
1290 | tz->trips.active[0].temperature) | |
1da177e4 | 1291 | tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE; |
4be44fcd | 1292 | else |
1da177e4 | 1293 | tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE; |
4be44fcd LB |
1294 | } else if (!tz->trips.active[0].flags.valid |
1295 | && tz->trips.passive.flags.valid) { | |
1da177e4 | 1296 | tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE; |
4be44fcd LB |
1297 | } else if (tz->trips.active[0].flags.valid |
1298 | && !tz->trips.passive.flags.valid) { | |
1da177e4 LT |
1299 | tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE; |
1300 | } else { | |
1301 | /* _ACx and _PSV are optional, but _CRT is required */ | |
1302 | tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL; | |
1303 | } | |
1304 | } | |
1305 | ||
1306 | /* Get default polling frequency [_TZP] (optional) */ | |
1307 | if (tzp) | |
1308 | tz->polling_frequency = tzp; | |
1309 | else | |
1310 | acpi_thermal_get_polling_frequency(tz); | |
1311 | ||
1312 | /* Get devices in this thermal zone [_TZD] (optional) */ | |
1313 | result = acpi_thermal_get_devices(tz); | |
1314 | if (!result) | |
1315 | tz->flags.devices = 1; | |
1316 | ||
1317 | return_VALUE(0); | |
1318 | } | |
1319 | ||
4be44fcd | 1320 | static int acpi_thermal_add(struct acpi_device *device) |
1da177e4 | 1321 | { |
4be44fcd LB |
1322 | int result = 0; |
1323 | acpi_status status = AE_OK; | |
1324 | struct acpi_thermal *tz = NULL; | |
1da177e4 LT |
1325 | |
1326 | ACPI_FUNCTION_TRACE("acpi_thermal_add"); | |
1327 | ||
1328 | if (!device) | |
1329 | return_VALUE(-EINVAL); | |
1330 | ||
1331 | tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL); | |
1332 | if (!tz) | |
1333 | return_VALUE(-ENOMEM); | |
1334 | memset(tz, 0, sizeof(struct acpi_thermal)); | |
1335 | ||
1336 | tz->handle = device->handle; | |
1337 | strcpy(tz->name, device->pnp.bus_id); | |
1338 | strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); | |
1339 | strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); | |
1340 | acpi_driver_data(device) = tz; | |
1341 | ||
1342 | result = acpi_thermal_get_info(tz); | |
1343 | if (result) | |
1344 | goto end; | |
1345 | ||
1346 | result = acpi_thermal_add_fs(device); | |
1347 | if (result) | |
09047e75 | 1348 | goto end; |
1da177e4 LT |
1349 | |
1350 | init_timer(&tz->timer); | |
1351 | ||
1352 | acpi_thermal_check(tz); | |
1353 | ||
1354 | status = acpi_install_notify_handler(tz->handle, | |
4be44fcd LB |
1355 | ACPI_DEVICE_NOTIFY, |
1356 | acpi_thermal_notify, tz); | |
1da177e4 LT |
1357 | if (ACPI_FAILURE(status)) { |
1358 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 1359 | "Error installing notify handler\n")); |
1da177e4 LT |
1360 | result = -ENODEV; |
1361 | goto end; | |
1362 | } | |
1363 | ||
1364 | printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n", | |
4be44fcd LB |
1365 | acpi_device_name(device), acpi_device_bid(device), |
1366 | KELVIN_TO_CELSIUS(tz->temperature)); | |
1da177e4 | 1367 | |
4be44fcd | 1368 | end: |
1da177e4 LT |
1369 | if (result) { |
1370 | acpi_thermal_remove_fs(device); | |
1371 | kfree(tz); | |
1372 | } | |
1373 | ||
1374 | return_VALUE(result); | |
1375 | } | |
1376 | ||
4be44fcd | 1377 | static int acpi_thermal_remove(struct acpi_device *device, int type) |
1da177e4 | 1378 | { |
4be44fcd LB |
1379 | acpi_status status = AE_OK; |
1380 | struct acpi_thermal *tz = NULL; | |
1da177e4 LT |
1381 | |
1382 | ACPI_FUNCTION_TRACE("acpi_thermal_remove"); | |
1383 | ||
1384 | if (!device || !acpi_driver_data(device)) | |
1385 | return_VALUE(-EINVAL); | |
1386 | ||
4be44fcd | 1387 | tz = (struct acpi_thermal *)acpi_driver_data(device); |
1da177e4 LT |
1388 | |
1389 | /* avoid timer adding new defer task */ | |
1390 | tz->zombie = 1; | |
1391 | /* wait for running timer (on other CPUs) finish */ | |
1392 | del_timer_sync(&(tz->timer)); | |
1393 | /* synchronize deferred task */ | |
1394 | acpi_os_wait_events_complete(NULL); | |
1395 | /* deferred task may reinsert timer */ | |
1396 | del_timer_sync(&(tz->timer)); | |
1397 | ||
1398 | status = acpi_remove_notify_handler(tz->handle, | |
4be44fcd LB |
1399 | ACPI_DEVICE_NOTIFY, |
1400 | acpi_thermal_notify); | |
1da177e4 LT |
1401 | if (ACPI_FAILURE(status)) |
1402 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
4be44fcd | 1403 | "Error removing notify handler\n")); |
1da177e4 LT |
1404 | |
1405 | /* Terminate policy */ | |
4be44fcd | 1406 | if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) { |
1da177e4 LT |
1407 | tz->trips.passive.flags.enabled = 0; |
1408 | acpi_thermal_passive(tz); | |
1409 | } | |
1410 | if (tz->trips.active[0].flags.valid | |
4be44fcd | 1411 | && tz->trips.active[0].flags.enabled) { |
1da177e4 LT |
1412 | tz->trips.active[0].flags.enabled = 0; |
1413 | acpi_thermal_active(tz); | |
1414 | } | |
1415 | ||
1416 | acpi_thermal_remove_fs(device); | |
1417 | ||
1418 | kfree(tz); | |
1419 | return_VALUE(0); | |
1420 | } | |
1421 | ||
74ce1468 KK |
1422 | static int acpi_thermal_resume(struct acpi_device *device, int state) |
1423 | { | |
1424 | struct acpi_thermal *tz = NULL; | |
1425 | ||
1426 | if (!device || !acpi_driver_data(device)) | |
1427 | return_VALUE(-EINVAL); | |
1428 | ||
1429 | tz = (struct acpi_thermal *)acpi_driver_data(device); | |
1430 | ||
1431 | acpi_thermal_check(tz); | |
1432 | ||
1433 | return AE_OK; | |
1434 | } | |
1435 | ||
4be44fcd | 1436 | static int __init acpi_thermal_init(void) |
1da177e4 | 1437 | { |
4be44fcd | 1438 | int result = 0; |
1da177e4 LT |
1439 | |
1440 | ACPI_FUNCTION_TRACE("acpi_thermal_init"); | |
1441 | ||
1442 | acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir); | |
1443 | if (!acpi_thermal_dir) | |
1444 | return_VALUE(-ENODEV); | |
1445 | acpi_thermal_dir->owner = THIS_MODULE; | |
1446 | ||
1447 | result = acpi_bus_register_driver(&acpi_thermal_driver); | |
1448 | if (result < 0) { | |
1449 | remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); | |
1450 | return_VALUE(-ENODEV); | |
1451 | } | |
1452 | ||
1453 | return_VALUE(0); | |
1454 | } | |
1455 | ||
4be44fcd | 1456 | static void __exit acpi_thermal_exit(void) |
1da177e4 LT |
1457 | { |
1458 | ACPI_FUNCTION_TRACE("acpi_thermal_exit"); | |
1459 | ||
1460 | acpi_bus_unregister_driver(&acpi_thermal_driver); | |
1461 | ||
1462 | remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); | |
1463 | ||
1464 | return_VOID; | |
1465 | } | |
1466 | ||
1da177e4 LT |
1467 | module_init(acpi_thermal_init); |
1468 | module_exit(acpi_thermal_exit); |