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[mirror_ubuntu-bionic-kernel.git] / drivers / acpi / thermal.c
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, int state);
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 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;
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 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 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 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 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 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->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->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->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->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->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->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->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->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->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->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->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->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->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 int result = 0;
457 struct acpi_device *device = NULL;
458
459
460 if (!tz || !tz->trips.critical.flags.valid)
461 return -EINVAL;
462
463 if (tz->temperature >= tz->trips.critical.temperature) {
464 printk(KERN_WARNING PREFIX "Critical trip point\n");
465 tz->trips.critical.flags.enabled = 1;
466 } else if (tz->trips.critical.flags.enabled)
467 tz->trips.critical.flags.enabled = 0;
468
469 result = acpi_bus_get_device(tz->handle, &device);
470 if (result)
471 return result;
472
473 printk(KERN_EMERG
474 "Critical temperature reached (%ld C), shutting down.\n",
475 KELVIN_TO_CELSIUS(tz->temperature));
476 acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL,
477 tz->trips.critical.flags.enabled);
478
479 acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
480
481 return 0;
482 }
483
484 static int acpi_thermal_hot(struct acpi_thermal *tz)
485 {
486 int result = 0;
487 struct acpi_device *device = NULL;
488
489
490 if (!tz || !tz->trips.hot.flags.valid)
491 return -EINVAL;
492
493 if (tz->temperature >= tz->trips.hot.temperature) {
494 printk(KERN_WARNING PREFIX "Hot trip point\n");
495 tz->trips.hot.flags.enabled = 1;
496 } else if (tz->trips.hot.flags.enabled)
497 tz->trips.hot.flags.enabled = 0;
498
499 result = acpi_bus_get_device(tz->handle, &device);
500 if (result)
501 return result;
502
503 acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT,
504 tz->trips.hot.flags.enabled);
505
506 /* TBD: Call user-mode "sleep(S4)" function */
507
508 return 0;
509 }
510
511 static void acpi_thermal_passive(struct acpi_thermal *tz)
512 {
513 int result = 1;
514 struct acpi_thermal_passive *passive = NULL;
515 int trend = 0;
516 int i = 0;
517
518
519 if (!tz || !tz->trips.passive.flags.valid)
520 return;
521
522 passive = &(tz->trips.passive);
523
524 /*
525 * Above Trip?
526 * -----------
527 * Calculate the thermal trend (using the passive cooling equation)
528 * and modify the performance limit for all passive cooling devices
529 * accordingly. Note that we assume symmetry.
530 */
531 if (tz->temperature >= passive->temperature) {
532 trend =
533 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
534 (passive->tc2 * (tz->temperature - passive->temperature));
535 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
536 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
537 trend, passive->tc1, tz->temperature,
538 tz->last_temperature, passive->tc2,
539 tz->temperature, passive->temperature));
540 passive->flags.enabled = 1;
541 /* Heating up? */
542 if (trend > 0)
543 for (i = 0; i < passive->devices.count; i++)
544 acpi_processor_set_thermal_limit(passive->
545 devices.
546 handles[i],
547 ACPI_PROCESSOR_LIMIT_INCREMENT);
548 /* Cooling off? */
549 else if (trend < 0) {
550 for (i = 0; i < passive->devices.count; i++)
551 /*
552 * assume that we are on highest
553 * freq/lowest thrott and can leave
554 * passive mode, even in error case
555 */
556 if (!acpi_processor_set_thermal_limit
557 (passive->devices.handles[i],
558 ACPI_PROCESSOR_LIMIT_DECREMENT))
559 result = 0;
560 /*
561 * Leave cooling mode, even if the temp might
562 * higher than trip point This is because some
563 * machines might have long thermal polling
564 * frequencies (tsp) defined. We will fall back
565 * into passive mode in next cycle (probably quicker)
566 */
567 if (result) {
568 passive->flags.enabled = 0;
569 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
570 "Disabling passive cooling, still above threshold,"
571 " but we are cooling down\n"));
572 }
573 }
574 return;
575 }
576
577 /*
578 * Below Trip?
579 * -----------
580 * Implement passive cooling hysteresis to slowly increase performance
581 * and avoid thrashing around the passive trip point. Note that we
582 * assume symmetry.
583 */
584 if (!passive->flags.enabled)
585 return;
586 for (i = 0; i < passive->devices.count; i++)
587 if (!acpi_processor_set_thermal_limit
588 (passive->devices.handles[i],
589 ACPI_PROCESSOR_LIMIT_DECREMENT))
590 result = 0;
591 if (result) {
592 passive->flags.enabled = 0;
593 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
594 "Disabling passive cooling (zone is cool)\n"));
595 }
596 }
597
598 static void acpi_thermal_active(struct acpi_thermal *tz)
599 {
600 int result = 0;
601 struct acpi_thermal_active *active = NULL;
602 int i = 0;
603 int j = 0;
604 unsigned long maxtemp = 0;
605
606
607 if (!tz)
608 return;
609
610 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
611 active = &(tz->trips.active[i]);
612 if (!active || !active->flags.valid)
613 break;
614 if (tz->temperature >= active->temperature) {
615 /*
616 * Above Threshold?
617 * ----------------
618 * If not already enabled, turn ON all cooling devices
619 * associated with this active threshold.
620 */
621 if (active->temperature > maxtemp)
622 tz->state.active_index = i;
623 maxtemp = active->temperature;
624 if (active->flags.enabled)
625 continue;
626 for (j = 0; j < active->devices.count; j++) {
627 result =
628 acpi_bus_set_power(active->devices.
629 handles[j],
630 ACPI_STATE_D0);
631 if (result) {
632 printk(KERN_WARNING PREFIX
633 "Unable to turn cooling device [%p] 'on'\n",
634 active->devices.
635 handles[j]);
636 continue;
637 }
638 active->flags.enabled = 1;
639 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
640 "Cooling device [%p] now 'on'\n",
641 active->devices.handles[j]));
642 }
643 continue;
644 }
645 if (!active->flags.enabled)
646 continue;
647 /*
648 * Below Threshold?
649 * ----------------
650 * Turn OFF all cooling devices associated with this
651 * threshold.
652 */
653 for (j = 0; j < active->devices.count; j++) {
654 result = acpi_bus_set_power(active->devices.handles[j],
655 ACPI_STATE_D3);
656 if (result) {
657 printk(KERN_WARNING PREFIX
658 "Unable to turn cooling device [%p] 'off'\n",
659 active->devices.handles[j]);
660 continue;
661 }
662 active->flags.enabled = 0;
663 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
664 "Cooling device [%p] now 'off'\n",
665 active->devices.handles[j]));
666 }
667 }
668 }
669
670 static void acpi_thermal_check(void *context);
671
672 static void acpi_thermal_run(unsigned long data)
673 {
674 struct acpi_thermal *tz = (struct acpi_thermal *)data;
675 if (!tz->zombie)
676 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
677 }
678
679 static void acpi_thermal_check(void *data)
680 {
681 int result = 0;
682 struct acpi_thermal *tz = (struct acpi_thermal *)data;
683 unsigned long sleep_time = 0;
684 int i = 0;
685 struct acpi_thermal_state state;
686
687
688 if (!tz) {
689 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
690 return;
691 }
692
693 state = tz->state;
694
695 result = acpi_thermal_get_temperature(tz);
696 if (result)
697 return;
698
699 memset(&tz->state, 0, sizeof(tz->state));
700
701 /*
702 * Check Trip Points
703 * -----------------
704 * Compare the current temperature to the trip point values to see
705 * if we've entered one of the thermal policy states. Note that
706 * this function determines when a state is entered, but the
707 * individual policy decides when it is exited (e.g. hysteresis).
708 */
709 if (tz->trips.critical.flags.valid)
710 state.critical |=
711 (tz->temperature >= tz->trips.critical.temperature);
712 if (tz->trips.hot.flags.valid)
713 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
714 if (tz->trips.passive.flags.valid)
715 state.passive |=
716 (tz->temperature >= tz->trips.passive.temperature);
717 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
718 if (tz->trips.active[i].flags.valid)
719 state.active |=
720 (tz->temperature >=
721 tz->trips.active[i].temperature);
722
723 /*
724 * Invoke Policy
725 * -------------
726 * Separated from the above check to allow individual policy to
727 * determine when to exit a given state.
728 */
729 if (state.critical)
730 acpi_thermal_critical(tz);
731 if (state.hot)
732 acpi_thermal_hot(tz);
733 if (state.passive)
734 acpi_thermal_passive(tz);
735 if (state.active)
736 acpi_thermal_active(tz);
737
738 /*
739 * Calculate State
740 * ---------------
741 * Again, separated from the above two to allow independent policy
742 * decisions.
743 */
744 tz->state.critical = tz->trips.critical.flags.enabled;
745 tz->state.hot = tz->trips.hot.flags.enabled;
746 tz->state.passive = tz->trips.passive.flags.enabled;
747 tz->state.active = 0;
748 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
749 tz->state.active |= tz->trips.active[i].flags.enabled;
750
751 /*
752 * Calculate Sleep Time
753 * --------------------
754 * If we're in the passive state, use _TSP's value. Otherwise
755 * use the default polling frequency (e.g. _TZP). If no polling
756 * frequency is specified then we'll wait forever (at least until
757 * a thermal event occurs). Note that _TSP and _TZD values are
758 * given in 1/10th seconds (we must covert to milliseconds).
759 */
760 if (tz->state.passive)
761 sleep_time = tz->trips.passive.tsp * 100;
762 else if (tz->polling_frequency > 0)
763 sleep_time = tz->polling_frequency * 100;
764
765 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
766 tz->name, tz->temperature, sleep_time));
767
768 /*
769 * Schedule Next Poll
770 * ------------------
771 */
772 if (!sleep_time) {
773 if (timer_pending(&(tz->timer)))
774 del_timer(&(tz->timer));
775 } else {
776 if (timer_pending(&(tz->timer)))
777 mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
778 else {
779 tz->timer.data = (unsigned long)tz;
780 tz->timer.function = acpi_thermal_run;
781 tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
782 add_timer(&(tz->timer));
783 }
784 }
785
786 return;
787 }
788
789 /* --------------------------------------------------------------------------
790 FS Interface (/proc)
791 -------------------------------------------------------------------------- */
792
793 static struct proc_dir_entry *acpi_thermal_dir;
794
795 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
796 {
797 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
798
799
800 if (!tz)
801 goto end;
802
803 seq_puts(seq, "state: ");
804
805 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
806 && !tz->state.active)
807 seq_puts(seq, "ok\n");
808 else {
809 if (tz->state.critical)
810 seq_puts(seq, "critical ");
811 if (tz->state.hot)
812 seq_puts(seq, "hot ");
813 if (tz->state.passive)
814 seq_puts(seq, "passive ");
815 if (tz->state.active)
816 seq_printf(seq, "active[%d]", tz->state.active_index);
817 seq_puts(seq, "\n");
818 }
819
820 end:
821 return 0;
822 }
823
824 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
825 {
826 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
827 }
828
829 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
830 {
831 int result = 0;
832 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
833
834
835 if (!tz)
836 goto end;
837
838 result = acpi_thermal_get_temperature(tz);
839 if (result)
840 goto end;
841
842 seq_printf(seq, "temperature: %ld C\n",
843 KELVIN_TO_CELSIUS(tz->temperature));
844
845 end:
846 return 0;
847 }
848
849 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
850 {
851 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
852 }
853
854 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
855 {
856 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
857 int i = 0;
858 int j = 0;
859
860
861 if (!tz)
862 goto end;
863
864 if (tz->trips.critical.flags.valid)
865 seq_printf(seq, "critical (S5): %ld C\n",
866 KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
867
868 if (tz->trips.hot.flags.valid)
869 seq_printf(seq, "hot (S4): %ld C\n",
870 KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
871
872 if (tz->trips.passive.flags.valid) {
873 seq_printf(seq,
874 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
875 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
876 tz->trips.passive.tc1, tz->trips.passive.tc2,
877 tz->trips.passive.tsp);
878 for (j = 0; j < tz->trips.passive.devices.count; j++) {
879
880 seq_printf(seq, "0x%p ",
881 tz->trips.passive.devices.handles[j]);
882 }
883 seq_puts(seq, "\n");
884 }
885
886 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
887 if (!(tz->trips.active[i].flags.valid))
888 break;
889 seq_printf(seq, "active[%d]: %ld C: devices=",
890 i,
891 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
892 for (j = 0; j < tz->trips.active[i].devices.count; j++)
893 seq_printf(seq, "0x%p ",
894 tz->trips.active[i].devices.handles[j]);
895 seq_puts(seq, "\n");
896 }
897
898 end:
899 return 0;
900 }
901
902 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
903 {
904 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
905 }
906
907 static ssize_t
908 acpi_thermal_write_trip_points(struct file *file,
909 const char __user * buffer,
910 size_t count, loff_t * ppos)
911 {
912 struct seq_file *m = (struct seq_file *)file->private_data;
913 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
914
915 char *limit_string;
916 int num, critical, hot, passive;
917 int *active;
918 int i = 0;
919
920
921 limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
922 if (!limit_string)
923 return -ENOMEM;
924
925 memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
926
927 active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
928 if (!active) {
929 kfree(limit_string);
930 return -ENOMEM;
931 }
932
933 if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
934 count = -EINVAL;
935 goto end;
936 }
937
938 if (copy_from_user(limit_string, buffer, count)) {
939 count = -EFAULT;
940 goto end;
941 }
942
943 limit_string[count] = '\0';
944
945 num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
946 &critical, &hot, &passive,
947 &active[0], &active[1], &active[2], &active[3], &active[4],
948 &active[5], &active[6], &active[7], &active[8],
949 &active[9]);
950 if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
951 count = -EINVAL;
952 goto end;
953 }
954
955 tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
956 tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
957 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
958 for (i = 0; i < num - 3; i++) {
959 if (!(tz->trips.active[i].flags.valid))
960 break;
961 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
962 }
963
964 end:
965 kfree(active);
966 kfree(limit_string);
967 return count;
968 }
969
970 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
971 {
972 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
973
974
975 if (!tz)
976 goto end;
977
978 if (!tz->flags.cooling_mode) {
979 seq_puts(seq, "<setting not supported>\n");
980 }
981
982 if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
983 seq_printf(seq, "cooling mode: critical\n");
984 else
985 seq_printf(seq, "cooling mode: %s\n",
986 tz->cooling_mode ? "passive" : "active");
987
988 end:
989 return 0;
990 }
991
992 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
993 {
994 return single_open(file, acpi_thermal_cooling_seq_show,
995 PDE(inode)->data);
996 }
997
998 static ssize_t
999 acpi_thermal_write_cooling_mode(struct file *file,
1000 const char __user * buffer,
1001 size_t count, loff_t * ppos)
1002 {
1003 struct seq_file *m = (struct seq_file *)file->private_data;
1004 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1005 int result = 0;
1006 char mode_string[12] = { '\0' };
1007
1008
1009 if (!tz || (count > sizeof(mode_string) - 1))
1010 return -EINVAL;
1011
1012 if (!tz->flags.cooling_mode)
1013 return -ENODEV;
1014
1015 if (copy_from_user(mode_string, buffer, count))
1016 return -EFAULT;
1017
1018 mode_string[count] = '\0';
1019
1020 result = acpi_thermal_set_cooling_mode(tz,
1021 simple_strtoul(mode_string, NULL,
1022 0));
1023 if (result)
1024 return result;
1025
1026 acpi_thermal_check(tz);
1027
1028 return count;
1029 }
1030
1031 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1032 {
1033 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1034
1035
1036 if (!tz)
1037 goto end;
1038
1039 if (!tz->polling_frequency) {
1040 seq_puts(seq, "<polling disabled>\n");
1041 goto end;
1042 }
1043
1044 seq_printf(seq, "polling frequency: %lu seconds\n",
1045 (tz->polling_frequency / 10));
1046
1047 end:
1048 return 0;
1049 }
1050
1051 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1052 {
1053 return single_open(file, acpi_thermal_polling_seq_show,
1054 PDE(inode)->data);
1055 }
1056
1057 static ssize_t
1058 acpi_thermal_write_polling(struct file *file,
1059 const char __user * buffer,
1060 size_t count, loff_t * ppos)
1061 {
1062 struct seq_file *m = (struct seq_file *)file->private_data;
1063 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1064 int result = 0;
1065 char polling_string[12] = { '\0' };
1066 int seconds = 0;
1067
1068
1069 if (!tz || (count > sizeof(polling_string) - 1))
1070 return -EINVAL;
1071
1072 if (copy_from_user(polling_string, buffer, count))
1073 return -EFAULT;
1074
1075 polling_string[count] = '\0';
1076
1077 seconds = simple_strtoul(polling_string, NULL, 0);
1078
1079 result = acpi_thermal_set_polling(tz, seconds);
1080 if (result)
1081 return result;
1082
1083 acpi_thermal_check(tz);
1084
1085 return count;
1086 }
1087
1088 static int acpi_thermal_add_fs(struct acpi_device *device)
1089 {
1090 struct proc_dir_entry *entry = NULL;
1091
1092
1093 if (!acpi_device_dir(device)) {
1094 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1095 acpi_thermal_dir);
1096 if (!acpi_device_dir(device))
1097 return -ENODEV;
1098 acpi_device_dir(device)->owner = THIS_MODULE;
1099 }
1100
1101 /* 'state' [R] */
1102 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1103 S_IRUGO, acpi_device_dir(device));
1104 if (!entry)
1105 return -ENODEV;
1106 else {
1107 entry->proc_fops = &acpi_thermal_state_fops;
1108 entry->data = acpi_driver_data(device);
1109 entry->owner = THIS_MODULE;
1110 }
1111
1112 /* 'temperature' [R] */
1113 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1114 S_IRUGO, acpi_device_dir(device));
1115 if (!entry)
1116 return -ENODEV;
1117 else {
1118 entry->proc_fops = &acpi_thermal_temp_fops;
1119 entry->data = acpi_driver_data(device);
1120 entry->owner = THIS_MODULE;
1121 }
1122
1123 /* 'trip_points' [R/W] */
1124 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1125 S_IFREG | S_IRUGO | S_IWUSR,
1126 acpi_device_dir(device));
1127 if (!entry)
1128 return -ENODEV;
1129 else {
1130 entry->proc_fops = &acpi_thermal_trip_fops;
1131 entry->data = acpi_driver_data(device);
1132 entry->owner = THIS_MODULE;
1133 }
1134
1135 /* 'cooling_mode' [R/W] */
1136 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1137 S_IFREG | S_IRUGO | S_IWUSR,
1138 acpi_device_dir(device));
1139 if (!entry)
1140 return -ENODEV;
1141 else {
1142 entry->proc_fops = &acpi_thermal_cooling_fops;
1143 entry->data = acpi_driver_data(device);
1144 entry->owner = THIS_MODULE;
1145 }
1146
1147 /* 'polling_frequency' [R/W] */
1148 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1149 S_IFREG | S_IRUGO | S_IWUSR,
1150 acpi_device_dir(device));
1151 if (!entry)
1152 return -ENODEV;
1153 else {
1154 entry->proc_fops = &acpi_thermal_polling_fops;
1155 entry->data = acpi_driver_data(device);
1156 entry->owner = THIS_MODULE;
1157 }
1158
1159 return 0;
1160 }
1161
1162 static int acpi_thermal_remove_fs(struct acpi_device *device)
1163 {
1164
1165 if (acpi_device_dir(device)) {
1166 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1167 acpi_device_dir(device));
1168 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1169 acpi_device_dir(device));
1170 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1171 acpi_device_dir(device));
1172 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1173 acpi_device_dir(device));
1174 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1175 acpi_device_dir(device));
1176 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1177 acpi_device_dir(device) = NULL;
1178 }
1179
1180 return 0;
1181 }
1182
1183 /* --------------------------------------------------------------------------
1184 Driver Interface
1185 -------------------------------------------------------------------------- */
1186
1187 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1188 {
1189 struct acpi_thermal *tz = (struct acpi_thermal *)data;
1190 struct acpi_device *device = NULL;
1191
1192
1193 if (!tz)
1194 return;
1195
1196 if (acpi_bus_get_device(tz->handle, &device))
1197 return;
1198
1199 switch (event) {
1200 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1201 acpi_thermal_check(tz);
1202 break;
1203 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1204 acpi_thermal_get_trip_points(tz);
1205 acpi_thermal_check(tz);
1206 acpi_bus_generate_event(device, event, 0);
1207 break;
1208 case ACPI_THERMAL_NOTIFY_DEVICES:
1209 if (tz->flags.devices)
1210 acpi_thermal_get_devices(tz);
1211 acpi_bus_generate_event(device, event, 0);
1212 break;
1213 default:
1214 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1215 "Unsupported event [0x%x]\n", event));
1216 break;
1217 }
1218
1219 return;
1220 }
1221
1222 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1223 {
1224 int result = 0;
1225
1226
1227 if (!tz)
1228 return -EINVAL;
1229
1230 /* Get temperature [_TMP] (required) */
1231 result = acpi_thermal_get_temperature(tz);
1232 if (result)
1233 return result;
1234
1235 /* Get trip points [_CRT, _PSV, etc.] (required) */
1236 result = acpi_thermal_get_trip_points(tz);
1237 if (result)
1238 return result;
1239
1240 /* Set the cooling mode [_SCP] to active cooling (default) */
1241 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1242 if (!result)
1243 tz->flags.cooling_mode = 1;
1244 else {
1245 /* Oh,we have not _SCP method.
1246 Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1247 tz->flags.cooling_mode = 0;
1248 if (tz->trips.active[0].flags.valid
1249 && tz->trips.passive.flags.valid) {
1250 if (tz->trips.passive.temperature >
1251 tz->trips.active[0].temperature)
1252 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1253 else
1254 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1255 } else if (!tz->trips.active[0].flags.valid
1256 && tz->trips.passive.flags.valid) {
1257 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1258 } else if (tz->trips.active[0].flags.valid
1259 && !tz->trips.passive.flags.valid) {
1260 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1261 } else {
1262 /* _ACx and _PSV are optional, but _CRT is required */
1263 tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1264 }
1265 }
1266
1267 /* Get default polling frequency [_TZP] (optional) */
1268 if (tzp)
1269 tz->polling_frequency = tzp;
1270 else
1271 acpi_thermal_get_polling_frequency(tz);
1272
1273 /* Get devices in this thermal zone [_TZD] (optional) */
1274 result = acpi_thermal_get_devices(tz);
1275 if (!result)
1276 tz->flags.devices = 1;
1277
1278 return 0;
1279 }
1280
1281 static int acpi_thermal_add(struct acpi_device *device)
1282 {
1283 int result = 0;
1284 acpi_status status = AE_OK;
1285 struct acpi_thermal *tz = NULL;
1286
1287
1288 if (!device)
1289 return -EINVAL;
1290
1291 tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1292 if (!tz)
1293 return -ENOMEM;
1294 memset(tz, 0, sizeof(struct acpi_thermal));
1295
1296 tz->handle = device->handle;
1297 strcpy(tz->name, device->pnp.bus_id);
1298 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1299 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1300 acpi_driver_data(device) = tz;
1301
1302 result = acpi_thermal_get_info(tz);
1303 if (result)
1304 goto end;
1305
1306 result = acpi_thermal_add_fs(device);
1307 if (result)
1308 goto end;
1309
1310 init_timer(&tz->timer);
1311
1312 acpi_thermal_check(tz);
1313
1314 status = acpi_install_notify_handler(tz->handle,
1315 ACPI_DEVICE_NOTIFY,
1316 acpi_thermal_notify, tz);
1317 if (ACPI_FAILURE(status)) {
1318 result = -ENODEV;
1319 goto end;
1320 }
1321
1322 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1323 acpi_device_name(device), acpi_device_bid(device),
1324 KELVIN_TO_CELSIUS(tz->temperature));
1325
1326 end:
1327 if (result) {
1328 acpi_thermal_remove_fs(device);
1329 kfree(tz);
1330 }
1331
1332 return result;
1333 }
1334
1335 static int acpi_thermal_remove(struct acpi_device *device, int type)
1336 {
1337 acpi_status status = AE_OK;
1338 struct acpi_thermal *tz = NULL;
1339
1340
1341 if (!device || !acpi_driver_data(device))
1342 return -EINVAL;
1343
1344 tz = (struct acpi_thermal *)acpi_driver_data(device);
1345
1346 /* avoid timer adding new defer task */
1347 tz->zombie = 1;
1348 /* wait for running timer (on other CPUs) finish */
1349 del_timer_sync(&(tz->timer));
1350 /* synchronize deferred task */
1351 acpi_os_wait_events_complete(NULL);
1352 /* deferred task may reinsert timer */
1353 del_timer_sync(&(tz->timer));
1354
1355 status = acpi_remove_notify_handler(tz->handle,
1356 ACPI_DEVICE_NOTIFY,
1357 acpi_thermal_notify);
1358
1359 /* Terminate policy */
1360 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1361 tz->trips.passive.flags.enabled = 0;
1362 acpi_thermal_passive(tz);
1363 }
1364 if (tz->trips.active[0].flags.valid
1365 && tz->trips.active[0].flags.enabled) {
1366 tz->trips.active[0].flags.enabled = 0;
1367 acpi_thermal_active(tz);
1368 }
1369
1370 acpi_thermal_remove_fs(device);
1371
1372 kfree(tz);
1373 return 0;
1374 }
1375
1376 static int acpi_thermal_resume(struct acpi_device *device, int state)
1377 {
1378 struct acpi_thermal *tz = NULL;
1379
1380 if (!device || !acpi_driver_data(device))
1381 return -EINVAL;
1382
1383 tz = (struct acpi_thermal *)acpi_driver_data(device);
1384
1385 acpi_thermal_check(tz);
1386
1387 return AE_OK;
1388 }
1389
1390 static int __init acpi_thermal_init(void)
1391 {
1392 int result = 0;
1393
1394
1395 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1396 if (!acpi_thermal_dir)
1397 return -ENODEV;
1398 acpi_thermal_dir->owner = THIS_MODULE;
1399
1400 result = acpi_bus_register_driver(&acpi_thermal_driver);
1401 if (result < 0) {
1402 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1403 return -ENODEV;
1404 }
1405
1406 return 0;
1407 }
1408
1409 static void __exit acpi_thermal_exit(void)
1410 {
1411
1412 acpi_bus_unregister_driver(&acpi_thermal_driver);
1413
1414 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1415
1416 return;
1417 }
1418
1419 module_init(acpi_thermal_init);
1420 module_exit(acpi_thermal_exit);
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