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[PATCH] new toplevel target: headers_check_all
[wrt350n-kernel.git] / drivers / acpi / thermal.c
blobf76d3168c2b2d3e098ba0ca14883853dc6917b19
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
73 ACPI_MODULE_NAME("acpi_thermal")
74
75 MODULE_AUTHOR("Paul Diefenbaugh");
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
83 static int acpi_thermal_add(struct acpi_device *device);
84 static int acpi_thermal_remove(struct acpi_device *device, int type);
85 static int acpi_thermal_resume(struct acpi_device *device);
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);
89 static ssize_t acpi_thermal_write_trip_points(struct file *,
90 const char __user *, size_t,
91 loff_t *);
92 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
93 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
94 const char __user *, size_t,
95 loff_t *);
96 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
97 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
98 size_t, loff_t *);
99
100 static struct acpi_driver acpi_thermal_driver = {
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,
107 .resume = acpi_thermal_resume,
108 },
109 };
110
111 struct acpi_thermal_state {
112 u8 critical:1;
113 u8 hot:1;
114 u8 passive:1;
115 u8 active:1;
116 u8 reserved:4;
117 int active_index;
118 };
119
120 struct acpi_thermal_state_flags {
121 u8 valid:1;
122 u8 enabled:1;
123 u8 reserved:6;
124 };
125
126 struct acpi_thermal_critical {
127 struct acpi_thermal_state_flags flags;
128 unsigned long temperature;
129 };
130
131 struct acpi_thermal_hot {
132 struct acpi_thermal_state_flags flags;
133 unsigned long temperature;
134 };
135
136 struct acpi_thermal_passive {
137 struct acpi_thermal_state_flags flags;
138 unsigned long temperature;
139 unsigned long tc1;
140 unsigned long tc2;
141 unsigned long tsp;
142 struct acpi_handle_list devices;
143 };
144
145 struct acpi_thermal_active {
146 struct acpi_thermal_state_flags flags;
147 unsigned long temperature;
148 struct acpi_handle_list devices;
149 };
150
151 struct acpi_thermal_trips {
152 struct acpi_thermal_critical critical;
153 struct acpi_thermal_hot hot;
154 struct acpi_thermal_passive passive;
155 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
156 };
157
158 struct acpi_thermal_flags {
159 u8 cooling_mode:1; /* _SCP */
160 u8 devices:1; /* _TZD */
161 u8 reserved:6;
162 };
163
164 struct acpi_thermal {
165 struct acpi_device * device;
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;
172 struct acpi_thermal_flags flags;
173 struct acpi_thermal_state state;
174 struct acpi_thermal_trips trips;
175 struct acpi_handle_list devices;
176 struct timer_list timer;
177 };
178
179 static const struct file_operations acpi_thermal_state_fops = {
180 .open = acpi_thermal_state_open_fs,
181 .read = seq_read,
182 .llseek = seq_lseek,
183 .release = single_release,
184 };
185
186 static const struct file_operations acpi_thermal_temp_fops = {
187 .open = acpi_thermal_temp_open_fs,
188 .read = seq_read,
189 .llseek = seq_lseek,
190 .release = single_release,
191 };
192
193 static const struct file_operations acpi_thermal_trip_fops = {
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,
199 };
200
201 static const struct file_operations acpi_thermal_cooling_fops = {
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,
207 };
208
209 static const struct file_operations acpi_thermal_polling_fops = {
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,
215 };
216
217 /* --------------------------------------------------------------------------
218 Thermal Zone Management
219 -------------------------------------------------------------------------- */
220
221 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
222 {
223 acpi_status status = AE_OK;
224
225
226 if (!tz)
227 return -EINVAL;
228
229 tz->last_temperature = tz->temperature;
230
231 status =
232 acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
233 if (ACPI_FAILURE(status))
234 return -ENODEV;
235
236 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
237 tz->temperature));
238
239 return 0;
240 }
241
242 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
243 {
244 acpi_status status = AE_OK;
245
246
247 if (!tz)
248 return -EINVAL;
249
250 status =
251 acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
252 &tz->polling_frequency);
253 if (ACPI_FAILURE(status))
254 return -ENODEV;
255
256 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
257 tz->polling_frequency));
258
259 return 0;
260 }
261
262 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
263 {
264
265 if (!tz)
266 return -EINVAL;
267
268 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */
269
270 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
271 "Polling frequency set to %lu seconds\n",
272 tz->polling_frequency));
273
274 return 0;
275 }
276
277 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
278 {
279 acpi_status status = AE_OK;
280 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
281 struct acpi_object_list arg_list = { 1, &arg0 };
282 acpi_handle handle = NULL;
283
284
285 if (!tz)
286 return -EINVAL;
287
288 status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
289 if (ACPI_FAILURE(status)) {
290 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
291 return -ENODEV;
292 }
293
294 arg0.integer.value = mode;
295
296 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
297 if (ACPI_FAILURE(status))
298 return -ENODEV;
299
300 tz->cooling_mode = mode;
301
302 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
303 mode ? "passive" : "active"));
304
305 return 0;
306 }
307
308 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
309 {
310 acpi_status status = AE_OK;
311 int i = 0;
312
313
314 if (!tz)
315 return -EINVAL;
316
317 /* Critical Shutdown (required) */
318
319 status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
320 &tz->trips.critical.temperature);
321 if (ACPI_FAILURE(status)) {
322 tz->trips.critical.flags.valid = 0;
323 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
324 return -ENODEV;
325 } else {
326 tz->trips.critical.flags.valid = 1;
327 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
328 "Found critical threshold [%lu]\n",
329 tz->trips.critical.temperature));
330 }
331
332 /* Critical Sleep (optional) */
333
334 status =
335 acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
336 &tz->trips.hot.temperature);
337 if (ACPI_FAILURE(status)) {
338 tz->trips.hot.flags.valid = 0;
339 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
340 } else {
341 tz->trips.hot.flags.valid = 1;
342 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
343 tz->trips.hot.temperature));
344 }
345
346 /* Passive: Processors (optional) */
347
348 status =
349 acpi_evaluate_integer(tz->device->handle, "_PSV", NULL,
350 &tz->trips.passive.temperature);
351 if (ACPI_FAILURE(status)) {
352 tz->trips.passive.flags.valid = 0;
353 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
354 } else {
355 tz->trips.passive.flags.valid = 1;
356
357 status =
358 acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
359 &tz->trips.passive.tc1);
360 if (ACPI_FAILURE(status))
361 tz->trips.passive.flags.valid = 0;
362
363 status =
364 acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
365 &tz->trips.passive.tc2);
366 if (ACPI_FAILURE(status))
367 tz->trips.passive.flags.valid = 0;
368
369 status =
370 acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
371 &tz->trips.passive.tsp);
372 if (ACPI_FAILURE(status))
373 tz->trips.passive.flags.valid = 0;
374
375 status =
376 acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
377 &tz->trips.passive.devices);
378 if (ACPI_FAILURE(status))
379 tz->trips.passive.flags.valid = 0;
380
381 if (!tz->trips.passive.flags.valid)
382 printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
383 else
384 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
385 "Found passive threshold [%lu]\n",
386 tz->trips.passive.temperature));
387 }
388
389 /* Active: Fans, etc. (optional) */
390
391 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
392
393 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
394
395 status =
396 acpi_evaluate_integer(tz->device->handle, name, NULL,
397 &tz->trips.active[i].temperature);
398 if (ACPI_FAILURE(status))
399 break;
400
401 name[2] = 'L';
402 status =
403 acpi_evaluate_reference(tz->device->handle, name, NULL,
404 &tz->trips.active[i].devices);
405 if (ACPI_SUCCESS(status)) {
406 tz->trips.active[i].flags.valid = 1;
407 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
408 "Found active threshold [%d]:[%lu]\n",
409 i, tz->trips.active[i].temperature));
410 } else
411 ACPI_EXCEPTION((AE_INFO, status,
412 "Invalid active threshold [%d]", i));
413 }
414
415 return 0;
416 }
417
418 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
419 {
420 acpi_status status = AE_OK;
421
422
423 if (!tz)
424 return -EINVAL;
425
426 status =
427 acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
428 if (ACPI_FAILURE(status))
429 return -ENODEV;
430
431 return 0;
432 }
433
434 static int acpi_thermal_call_usermode(char *path)
435 {
436 char *argv[2] = { NULL, NULL };
437 char *envp[3] = { NULL, NULL, NULL };
438
439
440 if (!path)
441 return -EINVAL;
442
443 argv[0] = path;
444
445 /* minimal command environment */
446 envp[0] = "HOME=/";
447 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
448
449 call_usermodehelper(argv[0], argv, envp, 0);
450
451 return 0;
452 }
453
454 static int acpi_thermal_critical(struct acpi_thermal *tz)
455 {
456 if (!tz || !tz->trips.critical.flags.valid)
457 return -EINVAL;
458
459 if (tz->temperature >= tz->trips.critical.temperature) {
460 printk(KERN_WARNING PREFIX "Critical trip point\n");
461 tz->trips.critical.flags.enabled = 1;
462 } else if (tz->trips.critical.flags.enabled)
463 tz->trips.critical.flags.enabled = 0;
464
465 printk(KERN_EMERG
466 "Critical temperature reached (%ld C), shutting down.\n",
467 KELVIN_TO_CELSIUS(tz->temperature));
468 acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
469 tz->trips.critical.flags.enabled);
470
471 acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
472
473 return 0;
474 }
475
476 static int acpi_thermal_hot(struct acpi_thermal *tz)
477 {
478 if (!tz || !tz->trips.hot.flags.valid)
479 return -EINVAL;
480
481 if (tz->temperature >= tz->trips.hot.temperature) {
482 printk(KERN_WARNING PREFIX "Hot trip point\n");
483 tz->trips.hot.flags.enabled = 1;
484 } else if (tz->trips.hot.flags.enabled)
485 tz->trips.hot.flags.enabled = 0;
486
487 acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
488 tz->trips.hot.flags.enabled);
489
490 /* TBD: Call user-mode "sleep(S4)" function */
491
492 return 0;
493 }
494
495 static void acpi_thermal_passive(struct acpi_thermal *tz)
496 {
497 int result = 1;
498 struct acpi_thermal_passive *passive = NULL;
499 int trend = 0;
500 int i = 0;
501
502
503 if (!tz || !tz->trips.passive.flags.valid)
504 return;
505
506 passive = &(tz->trips.passive);
507
508 /*
509 * Above Trip?
510 * -----------
511 * Calculate the thermal trend (using the passive cooling equation)
512 * and modify the performance limit for all passive cooling devices
513 * accordingly. Note that we assume symmetry.
514 */
515 if (tz->temperature >= passive->temperature) {
516 trend =
517 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
518 (passive->tc2 * (tz->temperature - passive->temperature));
519 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
520 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
521 trend, passive->tc1, tz->temperature,
522 tz->last_temperature, passive->tc2,
523 tz->temperature, passive->temperature));
524 passive->flags.enabled = 1;
525 /* Heating up? */
526 if (trend > 0)
527 for (i = 0; i < passive->devices.count; i++)
528 acpi_processor_set_thermal_limit(passive->
529 devices.
530 handles[i],
531 ACPI_PROCESSOR_LIMIT_INCREMENT);
532 /* Cooling off? */
533 else if (trend < 0) {
534 for (i = 0; i < passive->devices.count; i++)
535 /*
536 * assume that we are on highest
537 * freq/lowest thrott and can leave
538 * passive mode, even in error case
539 */
540 if (!acpi_processor_set_thermal_limit
541 (passive->devices.handles[i],
542 ACPI_PROCESSOR_LIMIT_DECREMENT))
543 result = 0;
544 /*
545 * Leave cooling mode, even if the temp might
546 * higher than trip point This is because some
547 * machines might have long thermal polling
548 * frequencies (tsp) defined. We will fall back
549 * into passive mode in next cycle (probably quicker)
550 */
551 if (result) {
552 passive->flags.enabled = 0;
553 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
554 "Disabling passive cooling, still above threshold,"
555 " but we are cooling down\n"));
556 }
557 }
558 return;
559 }
560
561 /*
562 * Below Trip?
563 * -----------
564 * Implement passive cooling hysteresis to slowly increase performance
565 * and avoid thrashing around the passive trip point. Note that we
566 * assume symmetry.
567 */
568 if (!passive->flags.enabled)
569 return;
570 for (i = 0; i < passive->devices.count; i++)
571 if (!acpi_processor_set_thermal_limit
572 (passive->devices.handles[i],
573 ACPI_PROCESSOR_LIMIT_DECREMENT))
574 result = 0;
575 if (result) {
576 passive->flags.enabled = 0;
577 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
578 "Disabling passive cooling (zone is cool)\n"));
579 }
580 }
581
582 static void acpi_thermal_active(struct acpi_thermal *tz)
583 {
584 int result = 0;
585 struct acpi_thermal_active *active = NULL;
586 int i = 0;
587 int j = 0;
588 unsigned long maxtemp = 0;
589
590
591 if (!tz)
592 return;
593
594 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
595 active = &(tz->trips.active[i]);
596 if (!active || !active->flags.valid)
597 break;
598 if (tz->temperature >= active->temperature) {
599 /*
600 * Above Threshold?
601 * ----------------
602 * If not already enabled, turn ON all cooling devices
603 * associated with this active threshold.
604 */
605 if (active->temperature > maxtemp)
606 tz->state.active_index = i;
607 maxtemp = active->temperature;
608 if (active->flags.enabled)
609 continue;
610 for (j = 0; j < active->devices.count; j++) {
611 result =
612 acpi_bus_set_power(active->devices.
613 handles[j],
614 ACPI_STATE_D0);
615 if (result) {
616 printk(KERN_WARNING PREFIX
617 "Unable to turn cooling device [%p] 'on'\n",
618 active->devices.
619 handles[j]);
620 continue;
621 }
622 active->flags.enabled = 1;
623 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
624 "Cooling device [%p] now 'on'\n",
625 active->devices.handles[j]));
626 }
627 continue;
628 }
629 if (!active->flags.enabled)
630 continue;
631 /*
632 * Below Threshold?
633 * ----------------
634 * Turn OFF all cooling devices associated with this
635 * threshold.
636 */
637 for (j = 0; j < active->devices.count; j++) {
638 result = acpi_bus_set_power(active->devices.handles[j],
639 ACPI_STATE_D3);
640 if (result) {
641 printk(KERN_WARNING PREFIX
642 "Unable to turn cooling device [%p] 'off'\n",
643 active->devices.handles[j]);
644 continue;
645 }
646 active->flags.enabled = 0;
647 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
648 "Cooling device [%p] now 'off'\n",
649 active->devices.handles[j]));
650 }
651 }
652 }
653
654 static void acpi_thermal_check(void *context);
655
656 static void acpi_thermal_run(unsigned long data)
657 {
658 struct acpi_thermal *tz = (struct acpi_thermal *)data;
659 if (!tz->zombie)
660 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
661 }
662
663 static void acpi_thermal_check(void *data)
664 {
665 int result = 0;
666 struct acpi_thermal *tz = data;
667 unsigned long sleep_time = 0;
668 int i = 0;
669 struct acpi_thermal_state state;
670
671
672 if (!tz) {
673 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
674 return;
675 }
676
677 state = tz->state;
678
679 result = acpi_thermal_get_temperature(tz);
680 if (result)
681 return;
682
683 memset(&tz->state, 0, sizeof(tz->state));
684
685 /*
686 * Check Trip Points
687 * -----------------
688 * Compare the current temperature to the trip point values to see
689 * if we've entered one of the thermal policy states. Note that
690 * this function determines when a state is entered, but the
691 * individual policy decides when it is exited (e.g. hysteresis).
692 */
693 if (tz->trips.critical.flags.valid)
694 state.critical |=
695 (tz->temperature >= tz->trips.critical.temperature);
696 if (tz->trips.hot.flags.valid)
697 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
698 if (tz->trips.passive.flags.valid)
699 state.passive |=
700 (tz->temperature >= tz->trips.passive.temperature);
701 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
702 if (tz->trips.active[i].flags.valid)
703 state.active |=
704 (tz->temperature >=
705 tz->trips.active[i].temperature);
706
707 /*
708 * Invoke Policy
709 * -------------
710 * Separated from the above check to allow individual policy to
711 * determine when to exit a given state.
712 */
713 if (state.critical)
714 acpi_thermal_critical(tz);
715 if (state.hot)
716 acpi_thermal_hot(tz);
717 if (state.passive)
718 acpi_thermal_passive(tz);
719 if (state.active)
720 acpi_thermal_active(tz);
721
722 /*
723 * Calculate State
724 * ---------------
725 * Again, separated from the above two to allow independent policy
726 * decisions.
727 */
728 tz->state.critical = tz->trips.critical.flags.enabled;
729 tz->state.hot = tz->trips.hot.flags.enabled;
730 tz->state.passive = tz->trips.passive.flags.enabled;
731 tz->state.active = 0;
732 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
733 tz->state.active |= tz->trips.active[i].flags.enabled;
734
735 /*
736 * Calculate Sleep Time
737 * --------------------
738 * If we're in the passive state, use _TSP's value. Otherwise
739 * use the default polling frequency (e.g. _TZP). If no polling
740 * frequency is specified then we'll wait forever (at least until
741 * a thermal event occurs). Note that _TSP and _TZD values are
742 * given in 1/10th seconds (we must covert to milliseconds).
743 */
744 if (tz->state.passive)
745 sleep_time = tz->trips.passive.tsp * 100;
746 else if (tz->polling_frequency > 0)
747 sleep_time = tz->polling_frequency * 100;
748
749 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
750 tz->name, tz->temperature, sleep_time));
751
752 /*
753 * Schedule Next Poll
754 * ------------------
755 */
756 if (!sleep_time) {
757 if (timer_pending(&(tz->timer)))
758 del_timer(&(tz->timer));
759 } else {
760 if (timer_pending(&(tz->timer)))
761 mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
762 else {
763 tz->timer.data = (unsigned long)tz;
764 tz->timer.function = acpi_thermal_run;
765 tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
766 add_timer(&(tz->timer));
767 }
768 }
769
770 return;
771 }
772
773 /* --------------------------------------------------------------------------
774 FS Interface (/proc)
775 -------------------------------------------------------------------------- */
776
777 static struct proc_dir_entry *acpi_thermal_dir;
778
779 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
780 {
781 struct acpi_thermal *tz = seq->private;
782
783
784 if (!tz)
785 goto end;
786
787 seq_puts(seq, "state: ");
788
789 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
790 && !tz->state.active)
791 seq_puts(seq, "ok\n");
792 else {
793 if (tz->state.critical)
794 seq_puts(seq, "critical ");
795 if (tz->state.hot)
796 seq_puts(seq, "hot ");
797 if (tz->state.passive)
798 seq_puts(seq, "passive ");
799 if (tz->state.active)
800 seq_printf(seq, "active[%d]", tz->state.active_index);
801 seq_puts(seq, "\n");
802 }
803
804 end:
805 return 0;
806 }
807
808 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
809 {
810 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
811 }
812
813 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
814 {
815 int result = 0;
816 struct acpi_thermal *tz = seq->private;
817
818
819 if (!tz)
820 goto end;
821
822 result = acpi_thermal_get_temperature(tz);
823 if (result)
824 goto end;
825
826 seq_printf(seq, "temperature: %ld C\n",
827 KELVIN_TO_CELSIUS(tz->temperature));
828
829 end:
830 return 0;
831 }
832
833 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
834 {
835 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
836 }
837
838 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
839 {
840 struct acpi_thermal *tz = seq->private;
841 int i = 0;
842 int j = 0;
843
844
845 if (!tz)
846 goto end;
847
848 if (tz->trips.critical.flags.valid)
849 seq_printf(seq, "critical (S5): %ld C\n",
850 KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
851
852 if (tz->trips.hot.flags.valid)
853 seq_printf(seq, "hot (S4): %ld C\n",
854 KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
855
856 if (tz->trips.passive.flags.valid) {
857 seq_printf(seq,
858 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
859 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
860 tz->trips.passive.tc1, tz->trips.passive.tc2,
861 tz->trips.passive.tsp);
862 for (j = 0; j < tz->trips.passive.devices.count; j++) {
863
864 seq_printf(seq, "0x%p ",
865 tz->trips.passive.devices.handles[j]);
866 }
867 seq_puts(seq, "\n");
868 }
869
870 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
871 if (!(tz->trips.active[i].flags.valid))
872 break;
873 seq_printf(seq, "active[%d]: %ld C: devices=",
874 i,
875 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
876 for (j = 0; j < tz->trips.active[i].devices.count; j++)
877 seq_printf(seq, "0x%p ",
878 tz->trips.active[i].devices.handles[j]);
879 seq_puts(seq, "\n");
880 }
881
882 end:
883 return 0;
884 }
885
886 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
887 {
888 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
889 }
890
891 static ssize_t
892 acpi_thermal_write_trip_points(struct file *file,
893 const char __user * buffer,
894 size_t count, loff_t * ppos)
895 {
896 struct seq_file *m = file->private_data;
897 struct acpi_thermal *tz = m->private;
898
899 char *limit_string;
900 int num, critical, hot, passive;
901 int *active;
902 int i = 0;
903
904
905 limit_string = kzalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
906 if (!limit_string)
907 return -ENOMEM;
908
909 active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
910 if (!active) {
911 kfree(limit_string);
912 return -ENOMEM;
913 }
914
915 if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
916 count = -EINVAL;
917 goto end;
918 }
919
920 if (copy_from_user(limit_string, buffer, count)) {
921 count = -EFAULT;
922 goto end;
923 }
924
925 limit_string[count] = '\0';
926
927 num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
928 &critical, &hot, &passive,
929 &active[0], &active[1], &active[2], &active[3], &active[4],
930 &active[5], &active[6], &active[7], &active[8],
931 &active[9]);
932 if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
933 count = -EINVAL;
934 goto end;
935 }
936
937 tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
938 tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
939 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
940 for (i = 0; i < num - 3; i++) {
941 if (!(tz->trips.active[i].flags.valid))
942 break;
943 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
944 }
945
946 end:
947 kfree(active);
948 kfree(limit_string);
949 return count;
950 }
951
952 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
953 {
954 struct acpi_thermal *tz = seq->private;
955
956
957 if (!tz)
958 goto end;
959
960 if (!tz->flags.cooling_mode) {
961 seq_puts(seq, "<setting not supported>\n");
962 }
963
964 if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
965 seq_printf(seq, "cooling mode: critical\n");
966 else
967 seq_printf(seq, "cooling mode: %s\n",
968 tz->cooling_mode ? "passive" : "active");
969
970 end:
971 return 0;
972 }
973
974 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
975 {
976 return single_open(file, acpi_thermal_cooling_seq_show,
977 PDE(inode)->data);
978 }
979
980 static ssize_t
981 acpi_thermal_write_cooling_mode(struct file *file,
982 const char __user * buffer,
983 size_t count, loff_t * ppos)
984 {
985 struct seq_file *m = file->private_data;
986 struct acpi_thermal *tz = m->private;
987 int result = 0;
988 char mode_string[12] = { '\0' };
989
990
991 if (!tz || (count > sizeof(mode_string) - 1))
992 return -EINVAL;
993
994 if (!tz->flags.cooling_mode)
995 return -ENODEV;
996
997 if (copy_from_user(mode_string, buffer, count))
998 return -EFAULT;
999
1000 mode_string[count] = '\0';
1001
1002 result = acpi_thermal_set_cooling_mode(tz,
1003 simple_strtoul(mode_string, NULL,
1004 0));
1005 if (result)
1006 return result;
1007
1008 acpi_thermal_check(tz);
1009
1010 return count;
1011 }
1012
1013 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1014 {
1015 struct acpi_thermal *tz = seq->private;
1016
1017
1018 if (!tz)
1019 goto end;
1020
1021 if (!tz->polling_frequency) {
1022 seq_puts(seq, "<polling disabled>\n");
1023 goto end;
1024 }
1025
1026 seq_printf(seq, "polling frequency: %lu seconds\n",
1027 (tz->polling_frequency / 10));
1028
1029 end:
1030 return 0;
1031 }
1032
1033 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1034 {
1035 return single_open(file, acpi_thermal_polling_seq_show,
1036 PDE(inode)->data);
1037 }
1038
1039 static ssize_t
1040 acpi_thermal_write_polling(struct file *file,
1041 const char __user * buffer,
1042 size_t count, loff_t * ppos)
1043 {
1044 struct seq_file *m = file->private_data;
1045 struct acpi_thermal *tz = m->private;
1046 int result = 0;
1047 char polling_string[12] = { '\0' };
1048 int seconds = 0;
1049
1050
1051 if (!tz || (count > sizeof(polling_string) - 1))
1052 return -EINVAL;
1053
1054 if (copy_from_user(polling_string, buffer, count))
1055 return -EFAULT;
1056
1057 polling_string[count] = '\0';
1058
1059 seconds = simple_strtoul(polling_string, NULL, 0);
1060
1061 result = acpi_thermal_set_polling(tz, seconds);
1062 if (result)
1063 return result;
1064
1065 acpi_thermal_check(tz);
1066
1067 return count;
1068 }
1069
1070 static int acpi_thermal_add_fs(struct acpi_device *device)
1071 {
1072 struct proc_dir_entry *entry = NULL;
1073
1074
1075 if (!acpi_device_dir(device)) {
1076 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1077 acpi_thermal_dir);
1078 if (!acpi_device_dir(device))
1079 return -ENODEV;
1080 acpi_device_dir(device)->owner = THIS_MODULE;
1081 }
1082
1083 /* 'state' [R] */
1084 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1085 S_IRUGO, acpi_device_dir(device));
1086 if (!entry)
1087 return -ENODEV;
1088 else {
1089 entry->proc_fops = &acpi_thermal_state_fops;
1090 entry->data = acpi_driver_data(device);
1091 entry->owner = THIS_MODULE;
1092 }
1093
1094 /* 'temperature' [R] */
1095 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1096 S_IRUGO, acpi_device_dir(device));
1097 if (!entry)
1098 return -ENODEV;
1099 else {
1100 entry->proc_fops = &acpi_thermal_temp_fops;
1101 entry->data = acpi_driver_data(device);
1102 entry->owner = THIS_MODULE;
1103 }
1104
1105 /* 'trip_points' [R/W] */
1106 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1107 S_IFREG | S_IRUGO | S_IWUSR,
1108 acpi_device_dir(device));
1109 if (!entry)
1110 return -ENODEV;
1111 else {
1112 entry->proc_fops = &acpi_thermal_trip_fops;
1113 entry->data = acpi_driver_data(device);
1114 entry->owner = THIS_MODULE;
1115 }
1116
1117 /* 'cooling_mode' [R/W] */
1118 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1119 S_IFREG | S_IRUGO | S_IWUSR,
1120 acpi_device_dir(device));
1121 if (!entry)
1122 return -ENODEV;
1123 else {
1124 entry->proc_fops = &acpi_thermal_cooling_fops;
1125 entry->data = acpi_driver_data(device);
1126 entry->owner = THIS_MODULE;
1127 }
1128
1129 /* 'polling_frequency' [R/W] */
1130 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1131 S_IFREG | S_IRUGO | S_IWUSR,
1132 acpi_device_dir(device));
1133 if (!entry)
1134 return -ENODEV;
1135 else {
1136 entry->proc_fops = &acpi_thermal_polling_fops;
1137 entry->data = acpi_driver_data(device);
1138 entry->owner = THIS_MODULE;
1139 }
1140
1141 return 0;
1142 }
1143
1144 static int acpi_thermal_remove_fs(struct acpi_device *device)
1145 {
1146
1147 if (acpi_device_dir(device)) {
1148 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1149 acpi_device_dir(device));
1150 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1151 acpi_device_dir(device));
1152 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1153 acpi_device_dir(device));
1154 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1155 acpi_device_dir(device));
1156 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1157 acpi_device_dir(device));
1158 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1159 acpi_device_dir(device) = NULL;
1160 }
1161
1162 return 0;
1163 }
1164
1165 /* --------------------------------------------------------------------------
1166 Driver Interface
1167 -------------------------------------------------------------------------- */
1168
1169 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1170 {
1171 struct acpi_thermal *tz = data;
1172 struct acpi_device *device = NULL;
1173
1174
1175 if (!tz)
1176 return;
1177
1178 device = tz->device;
1179
1180 switch (event) {
1181 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1182 acpi_thermal_check(tz);
1183 break;
1184 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1185 acpi_thermal_get_trip_points(tz);
1186 acpi_thermal_check(tz);
1187 acpi_bus_generate_event(device, event, 0);
1188 break;
1189 case ACPI_THERMAL_NOTIFY_DEVICES:
1190 if (tz->flags.devices)
1191 acpi_thermal_get_devices(tz);
1192 acpi_bus_generate_event(device, event, 0);
1193 break;
1194 default:
1195 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1196 "Unsupported event [0x%x]\n", event));
1197 break;
1198 }
1199
1200 return;
1201 }
1202
1203 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1204 {
1205 int result = 0;
1206
1207
1208 if (!tz)
1209 return -EINVAL;
1210
1211 /* Get temperature [_TMP] (required) */
1212 result = acpi_thermal_get_temperature(tz);
1213 if (result)
1214 return result;
1215
1216 /* Get trip points [_CRT, _PSV, etc.] (required) */
1217 result = acpi_thermal_get_trip_points(tz);
1218 if (result)
1219 return result;
1220
1221 /* Set the cooling mode [_SCP] to active cooling (default) */
1222 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1223 if (!result)
1224 tz->flags.cooling_mode = 1;
1225 else {
1226 /* Oh,we have not _SCP method.
1227 Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1228 tz->flags.cooling_mode = 0;
1229 if (tz->trips.active[0].flags.valid
1230 && tz->trips.passive.flags.valid) {
1231 if (tz->trips.passive.temperature >
1232 tz->trips.active[0].temperature)
1233 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1234 else
1235 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1236 } else if (!tz->trips.active[0].flags.valid
1237 && tz->trips.passive.flags.valid) {
1238 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1239 } else if (tz->trips.active[0].flags.valid
1240 && !tz->trips.passive.flags.valid) {
1241 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1242 } else {
1243 /* _ACx and _PSV are optional, but _CRT is required */
1244 tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1245 }
1246 }
1247
1248 /* Get default polling frequency [_TZP] (optional) */
1249 if (tzp)
1250 tz->polling_frequency = tzp;
1251 else
1252 acpi_thermal_get_polling_frequency(tz);
1253
1254 /* Get devices in this thermal zone [_TZD] (optional) */
1255 result = acpi_thermal_get_devices(tz);
1256 if (!result)
1257 tz->flags.devices = 1;
1258
1259 return 0;
1260 }
1261
1262 static int acpi_thermal_add(struct acpi_device *device)
1263 {
1264 int result = 0;
1265 acpi_status status = AE_OK;
1266 struct acpi_thermal *tz = NULL;
1267
1268
1269 if (!device)
1270 return -EINVAL;
1271
1272 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1273 if (!tz)
1274 return -ENOMEM;
1275
1276 tz->device = device;
1277 strcpy(tz->name, device->pnp.bus_id);
1278 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1279 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1280 acpi_driver_data(device) = tz;
1281
1282 result = acpi_thermal_get_info(tz);
1283 if (result)
1284 goto end;
1285
1286 result = acpi_thermal_add_fs(device);
1287 if (result)
1288 goto end;
1289
1290 init_timer(&tz->timer);
1291
1292 acpi_thermal_check(tz);
1293
1294 status = acpi_install_notify_handler(device->handle,
1295 ACPI_DEVICE_NOTIFY,
1296 acpi_thermal_notify, tz);
1297 if (ACPI_FAILURE(status)) {
1298 result = -ENODEV;
1299 goto end;
1300 }
1301
1302 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1303 acpi_device_name(device), acpi_device_bid(device),
1304 KELVIN_TO_CELSIUS(tz->temperature));
1305
1306 end:
1307 if (result) {
1308 acpi_thermal_remove_fs(device);
1309 kfree(tz);
1310 }
1311
1312 return result;
1313 }
1314
1315 static int acpi_thermal_remove(struct acpi_device *device, int type)
1316 {
1317 acpi_status status = AE_OK;
1318 struct acpi_thermal *tz = NULL;
1319
1320
1321 if (!device || !acpi_driver_data(device))
1322 return -EINVAL;
1323
1324 tz = acpi_driver_data(device);
1325
1326 /* avoid timer adding new defer task */
1327 tz->zombie = 1;
1328 /* wait for running timer (on other CPUs) finish */
1329 del_timer_sync(&(tz->timer));
1330 /* synchronize deferred task */
1331 acpi_os_wait_events_complete(NULL);
1332 /* deferred task may reinsert timer */
1333 del_timer_sync(&(tz->timer));
1334
1335 status = acpi_remove_notify_handler(device->handle,
1336 ACPI_DEVICE_NOTIFY,
1337 acpi_thermal_notify);
1338
1339 /* Terminate policy */
1340 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1341 tz->trips.passive.flags.enabled = 0;
1342 acpi_thermal_passive(tz);
1343 }
1344 if (tz->trips.active[0].flags.valid
1345 && tz->trips.active[0].flags.enabled) {
1346 tz->trips.active[0].flags.enabled = 0;
1347 acpi_thermal_active(tz);
1348 }
1349
1350 acpi_thermal_remove_fs(device);
1351
1352 kfree(tz);
1353 return 0;
1354 }
1355
1356 static int acpi_thermal_resume(struct acpi_device *device)
1357 {
1358 struct acpi_thermal *tz = NULL;
1359 int i;
1360
1361 if (!device || !acpi_driver_data(device))
1362 return -EINVAL;
1363
1364 tz = acpi_driver_data(device);
1365
1366 acpi_thermal_get_temperature(tz);
1367
1368 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1369 if (tz->trips.active[i].flags.valid) {
1370 tz->temperature = tz->trips.active[i].temperature;
1371 tz->trips.active[i].flags.enabled = 0;
1372
1373 acpi_thermal_active(tz);
1374
1375 tz->state.active |= tz->trips.active[i].flags.enabled;
1376 tz->state.active_index = i;
1377 }
1378 }
1379
1380 acpi_thermal_check(tz);
1381
1382 return AE_OK;
1383 }
1384
1385 static int __init acpi_thermal_init(void)
1386 {
1387 int result = 0;
1388
1389
1390 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1391 if (!acpi_thermal_dir)
1392 return -ENODEV;
1393 acpi_thermal_dir->owner = THIS_MODULE;
1394
1395 result = acpi_bus_register_driver(&acpi_thermal_driver);
1396 if (result < 0) {
1397 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1398 return -ENODEV;
1399 }
1400
1401 return 0;
1402 }
1403
1404 static void __exit acpi_thermal_exit(void)
1405 {
1406
1407 acpi_bus_unregister_driver(&acpi_thermal_driver);
1408
1409 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1410
1411 return;
1412 }
1413
1414 module_init(acpi_thermal_init);
1415 module_exit(acpi_thermal_exit);
WRT350N Kernel Patches