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x86: fix bootup crash in native_read_tsc()
[wrt350n-kernel.git] / drivers / acpi / thermal.c
blob5f79b44512120e489950f65a22d912aa88ed66ec
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/dmi.h>
37 #include <linux/init.h>
38 #include <linux/types.h>
39 #include <linux/proc_fs.h>
40 #include <linux/timer.h>
41 #include <linux/jiffies.h>
42 #include <linux/kmod.h>
43 #include <linux/seq_file.h>
44 #include <linux/reboot.h>
45 #include <asm/uaccess.h>
46
47 #include <acpi/acpi_bus.h>
48 #include <acpi/acpi_drivers.h>
49
50 #define ACPI_THERMAL_COMPONENT 0x04000000
51 #define ACPI_THERMAL_CLASS "thermal_zone"
52 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
53 #define ACPI_THERMAL_FILE_STATE "state"
54 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
55 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
56 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
57 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
60 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82
61 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
62 #define ACPI_THERMAL_NOTIFY_HOT 0xF1
63 #define ACPI_THERMAL_MODE_ACTIVE 0x00
64
65 #define ACPI_THERMAL_MAX_ACTIVE 10
66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
67
68 #define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
69 #define CELSIUS_TO_KELVIN(t) ((t+273)*10)
70
71 #define _COMPONENT ACPI_THERMAL_COMPONENT
72 ACPI_MODULE_NAME("thermal");
73
74 MODULE_AUTHOR("Paul Diefenbaugh");
75 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
76 MODULE_LICENSE("GPL");
77
78 static int act;
79 module_param(act, int, 0644);
80 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
81
82 static int crt;
83 module_param(crt, int, 0644);
84 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
85
86 static int tzp;
87 module_param(tzp, int, 0444);
88 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
89
90 static int nocrt;
91 module_param(nocrt, int, 0);
92 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
93
94 static int off;
95 module_param(off, int, 0);
96 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
97
98 static int psv;
99 module_param(psv, int, 0644);
100 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
101
102 static int acpi_thermal_add(struct acpi_device *device);
103 static int acpi_thermal_remove(struct acpi_device *device, int type);
104 static int acpi_thermal_resume(struct acpi_device *device);
105 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
106 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
107 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
108 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
109 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
110 const char __user *, size_t,
111 loff_t *);
112 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
113 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
114 size_t, loff_t *);
115
116 static const struct acpi_device_id thermal_device_ids[] = {
117 {ACPI_THERMAL_HID, 0},
118 {"", 0},
119 };
120 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
121
122 static struct acpi_driver acpi_thermal_driver = {
123 .name = "thermal",
124 .class = ACPI_THERMAL_CLASS,
125 .ids = thermal_device_ids,
126 .ops = {
127 .add = acpi_thermal_add,
128 .remove = acpi_thermal_remove,
129 .resume = acpi_thermal_resume,
130 },
131 };
132
133 struct acpi_thermal_state {
134 u8 critical:1;
135 u8 hot:1;
136 u8 passive:1;
137 u8 active:1;
138 u8 reserved:4;
139 int active_index;
140 };
141
142 struct acpi_thermal_state_flags {
143 u8 valid:1;
144 u8 enabled:1;
145 u8 reserved:6;
146 };
147
148 struct acpi_thermal_critical {
149 struct acpi_thermal_state_flags flags;
150 unsigned long temperature;
151 };
152
153 struct acpi_thermal_hot {
154 struct acpi_thermal_state_flags flags;
155 unsigned long temperature;
156 };
157
158 struct acpi_thermal_passive {
159 struct acpi_thermal_state_flags flags;
160 unsigned long temperature;
161 unsigned long tc1;
162 unsigned long tc2;
163 unsigned long tsp;
164 struct acpi_handle_list devices;
165 };
166
167 struct acpi_thermal_active {
168 struct acpi_thermal_state_flags flags;
169 unsigned long temperature;
170 struct acpi_handle_list devices;
171 };
172
173 struct acpi_thermal_trips {
174 struct acpi_thermal_critical critical;
175 struct acpi_thermal_hot hot;
176 struct acpi_thermal_passive passive;
177 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
178 };
179
180 struct acpi_thermal_flags {
181 u8 cooling_mode:1; /* _SCP */
182 u8 devices:1; /* _TZD */
183 u8 reserved:6;
184 };
185
186 struct acpi_thermal {
187 struct acpi_device * device;
188 acpi_bus_id name;
189 unsigned long temperature;
190 unsigned long last_temperature;
191 unsigned long polling_frequency;
192 volatile u8 zombie;
193 struct acpi_thermal_flags flags;
194 struct acpi_thermal_state state;
195 struct acpi_thermal_trips trips;
196 struct acpi_handle_list devices;
197 struct timer_list timer;
198 struct mutex lock;
199 };
200
201 static const struct file_operations acpi_thermal_state_fops = {
202 .open = acpi_thermal_state_open_fs,
203 .read = seq_read,
204 .llseek = seq_lseek,
205 .release = single_release,
206 };
207
208 static const struct file_operations acpi_thermal_temp_fops = {
209 .open = acpi_thermal_temp_open_fs,
210 .read = seq_read,
211 .llseek = seq_lseek,
212 .release = single_release,
213 };
214
215 static const struct file_operations acpi_thermal_trip_fops = {
216 .open = acpi_thermal_trip_open_fs,
217 .read = seq_read,
218 .llseek = seq_lseek,
219 .release = single_release,
220 };
221
222 static const struct file_operations acpi_thermal_cooling_fops = {
223 .open = acpi_thermal_cooling_open_fs,
224 .read = seq_read,
225 .write = acpi_thermal_write_cooling_mode,
226 .llseek = seq_lseek,
227 .release = single_release,
228 };
229
230 static const struct file_operations acpi_thermal_polling_fops = {
231 .open = acpi_thermal_polling_open_fs,
232 .read = seq_read,
233 .write = acpi_thermal_write_polling,
234 .llseek = seq_lseek,
235 .release = single_release,
236 };
237
238 /* --------------------------------------------------------------------------
239 Thermal Zone Management
240 -------------------------------------------------------------------------- */
241
242 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
243 {
244 acpi_status status = AE_OK;
245
246
247 if (!tz)
248 return -EINVAL;
249
250 tz->last_temperature = tz->temperature;
251
252 status =
253 acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
254 if (ACPI_FAILURE(status))
255 return -ENODEV;
256
257 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
258 tz->temperature));
259
260 return 0;
261 }
262
263 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
264 {
265 acpi_status status = AE_OK;
266
267
268 if (!tz)
269 return -EINVAL;
270
271 status =
272 acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
273 &tz->polling_frequency);
274 if (ACPI_FAILURE(status))
275 return -ENODEV;
276
277 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
278 tz->polling_frequency));
279
280 return 0;
281 }
282
283 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
284 {
285
286 if (!tz)
287 return -EINVAL;
288
289 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */
290
291 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
292 "Polling frequency set to %lu seconds\n",
293 tz->polling_frequency/10));
294
295 return 0;
296 }
297
298 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
299 {
300 acpi_status status = AE_OK;
301 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
302 struct acpi_object_list arg_list = { 1, &arg0 };
303 acpi_handle handle = NULL;
304
305
306 if (!tz)
307 return -EINVAL;
308
309 status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
310 if (ACPI_FAILURE(status)) {
311 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
312 return -ENODEV;
313 }
314
315 arg0.integer.value = mode;
316
317 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
318 if (ACPI_FAILURE(status))
319 return -ENODEV;
320
321 return 0;
322 }
323
324 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
325 {
326 acpi_status status = AE_OK;
327 int i = 0;
328
329
330 if (!tz)
331 return -EINVAL;
332
333 /* Critical Shutdown (required) */
334
335 status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
336 &tz->trips.critical.temperature);
337 if (ACPI_FAILURE(status)) {
338 tz->trips.critical.flags.valid = 0;
339 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
340 return -ENODEV;
341 } else {
342 tz->trips.critical.flags.valid = 1;
343 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
344 "Found critical threshold [%lu]\n",
345 tz->trips.critical.temperature));
346 }
347
348 if (tz->trips.critical.flags.valid == 1) {
349 if (crt == -1) {
350 tz->trips.critical.flags.valid = 0;
351 } else if (crt > 0) {
352 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
353
354 /*
355 * Allow override to lower critical threshold
356 */
357 if (crt_k < tz->trips.critical.temperature)
358 tz->trips.critical.temperature = crt_k;
359 }
360 }
361
362 /* Critical Sleep (optional) */
363
364 status =
365 acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
366 &tz->trips.hot.temperature);
367 if (ACPI_FAILURE(status)) {
368 tz->trips.hot.flags.valid = 0;
369 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
370 } else {
371 tz->trips.hot.flags.valid = 1;
372 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
373 tz->trips.hot.temperature));
374 }
375
376 /* Passive: Processors (optional) */
377
378 if (psv == -1) {
379 status = AE_SUPPORT;
380 } else if (psv > 0) {
381 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
382 status = AE_OK;
383 } else {
384 status = acpi_evaluate_integer(tz->device->handle,
385 "_PSV", NULL, &tz->trips.passive.temperature);
386 }
387
388 if (ACPI_FAILURE(status)) {
389 tz->trips.passive.flags.valid = 0;
390 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
391 } else {
392 tz->trips.passive.flags.valid = 1;
393
394 status =
395 acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
396 &tz->trips.passive.tc1);
397 if (ACPI_FAILURE(status))
398 tz->trips.passive.flags.valid = 0;
399
400 status =
401 acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
402 &tz->trips.passive.tc2);
403 if (ACPI_FAILURE(status))
404 tz->trips.passive.flags.valid = 0;
405
406 status =
407 acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
408 &tz->trips.passive.tsp);
409 if (ACPI_FAILURE(status))
410 tz->trips.passive.flags.valid = 0;
411
412 status =
413 acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
414 &tz->trips.passive.devices);
415 if (ACPI_FAILURE(status))
416 tz->trips.passive.flags.valid = 0;
417
418 if (!tz->trips.passive.flags.valid)
419 printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
420 else
421 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
422 "Found passive threshold [%lu]\n",
423 tz->trips.passive.temperature));
424 }
425
426 /* Active: Fans, etc. (optional) */
427
428 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
429
430 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
431
432 if (act == -1)
433 break; /* disable all active trip points */
434
435 status = acpi_evaluate_integer(tz->device->handle,
436 name, NULL, &tz->trips.active[i].temperature);
437
438 if (ACPI_FAILURE(status)) {
439 if (i == 0) /* no active trip points */
440 break;
441 if (act <= 0) /* no override requested */
442 break;
443 if (i == 1) { /* 1 trip point */
444 tz->trips.active[0].temperature =
445 CELSIUS_TO_KELVIN(act);
446 } else { /* multiple trips */
447 /*
448 * Don't allow override higher than
449 * the next higher trip point
450 */
451 tz->trips.active[i - 1].temperature =
452 (tz->trips.active[i - 2].temperature <
453 CELSIUS_TO_KELVIN(act) ?
454 tz->trips.active[i - 2].temperature :
455 CELSIUS_TO_KELVIN(act));
456 }
457 break;
458 }
459
460 name[2] = 'L';
461 status =
462 acpi_evaluate_reference(tz->device->handle, name, NULL,
463 &tz->trips.active[i].devices);
464 if (ACPI_SUCCESS(status)) {
465 tz->trips.active[i].flags.valid = 1;
466 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
467 "Found active threshold [%d]:[%lu]\n",
468 i, tz->trips.active[i].temperature));
469 } else
470 ACPI_EXCEPTION((AE_INFO, status,
471 "Invalid active threshold [%d]", i));
472 }
473
474 return 0;
475 }
476
477 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
478 {
479 acpi_status status = AE_OK;
480
481
482 if (!tz)
483 return -EINVAL;
484
485 status =
486 acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
487 if (ACPI_FAILURE(status))
488 return -ENODEV;
489
490 return 0;
491 }
492
493 static int acpi_thermal_critical(struct acpi_thermal *tz)
494 {
495 if (!tz || !tz->trips.critical.flags.valid || nocrt)
496 return -EINVAL;
497
498 if (tz->temperature >= tz->trips.critical.temperature) {
499 printk(KERN_WARNING PREFIX "Critical trip point\n");
500 tz->trips.critical.flags.enabled = 1;
501 } else if (tz->trips.critical.flags.enabled)
502 tz->trips.critical.flags.enabled = 0;
503
504 printk(KERN_EMERG
505 "Critical temperature reached (%ld C), shutting down.\n",
506 KELVIN_TO_CELSIUS(tz->temperature));
507 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
508 tz->trips.critical.flags.enabled);
509 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
510 tz->device->dev.bus_id,
511 ACPI_THERMAL_NOTIFY_CRITICAL,
512 tz->trips.critical.flags.enabled);
513
514 orderly_poweroff(true);
515
516 return 0;
517 }
518
519 static int acpi_thermal_hot(struct acpi_thermal *tz)
520 {
521 if (!tz || !tz->trips.hot.flags.valid || nocrt)
522 return -EINVAL;
523
524 if (tz->temperature >= tz->trips.hot.temperature) {
525 printk(KERN_WARNING PREFIX "Hot trip point\n");
526 tz->trips.hot.flags.enabled = 1;
527 } else if (tz->trips.hot.flags.enabled)
528 tz->trips.hot.flags.enabled = 0;
529
530 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
531 tz->trips.hot.flags.enabled);
532 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
533 tz->device->dev.bus_id,
534 ACPI_THERMAL_NOTIFY_HOT,
535 tz->trips.hot.flags.enabled);
536
537 /* TBD: Call user-mode "sleep(S4)" function */
538
539 return 0;
540 }
541
542 static void acpi_thermal_passive(struct acpi_thermal *tz)
543 {
544 int result = 1;
545 struct acpi_thermal_passive *passive = NULL;
546 int trend = 0;
547 int i = 0;
548
549
550 if (!tz || !tz->trips.passive.flags.valid)
551 return;
552
553 passive = &(tz->trips.passive);
554
555 /*
556 * Above Trip?
557 * -----------
558 * Calculate the thermal trend (using the passive cooling equation)
559 * and modify the performance limit for all passive cooling devices
560 * accordingly. Note that we assume symmetry.
561 */
562 if (tz->temperature >= passive->temperature) {
563 trend =
564 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
565 (passive->tc2 * (tz->temperature - passive->temperature));
566 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
567 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
568 trend, passive->tc1, tz->temperature,
569 tz->last_temperature, passive->tc2,
570 tz->temperature, passive->temperature));
571 passive->flags.enabled = 1;
572 /* Heating up? */
573 if (trend > 0)
574 for (i = 0; i < passive->devices.count; i++)
575 acpi_processor_set_thermal_limit(passive->
576 devices.
577 handles[i],
578 ACPI_PROCESSOR_LIMIT_INCREMENT);
579 /* Cooling off? */
580 else if (trend < 0) {
581 for (i = 0; i < passive->devices.count; i++)
582 /*
583 * assume that we are on highest
584 * freq/lowest thrott and can leave
585 * passive mode, even in error case
586 */
587 if (!acpi_processor_set_thermal_limit
588 (passive->devices.handles[i],
589 ACPI_PROCESSOR_LIMIT_DECREMENT))
590 result = 0;
591 /*
592 * Leave cooling mode, even if the temp might
593 * higher than trip point This is because some
594 * machines might have long thermal polling
595 * frequencies (tsp) defined. We will fall back
596 * into passive mode in next cycle (probably quicker)
597 */
598 if (result) {
599 passive->flags.enabled = 0;
600 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
601 "Disabling passive cooling, still above threshold,"
602 " but we are cooling down\n"));
603 }
604 }
605 return;
606 }
607
608 /*
609 * Below Trip?
610 * -----------
611 * Implement passive cooling hysteresis to slowly increase performance
612 * and avoid thrashing around the passive trip point. Note that we
613 * assume symmetry.
614 */
615 if (!passive->flags.enabled)
616 return;
617 for (i = 0; i < passive->devices.count; i++)
618 if (!acpi_processor_set_thermal_limit
619 (passive->devices.handles[i],
620 ACPI_PROCESSOR_LIMIT_DECREMENT))
621 result = 0;
622 if (result) {
623 passive->flags.enabled = 0;
624 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
625 "Disabling passive cooling (zone is cool)\n"));
626 }
627 }
628
629 static void acpi_thermal_active(struct acpi_thermal *tz)
630 {
631 int result = 0;
632 struct acpi_thermal_active *active = NULL;
633 int i = 0;
634 int j = 0;
635 unsigned long maxtemp = 0;
636
637
638 if (!tz)
639 return;
640
641 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
642 active = &(tz->trips.active[i]);
643 if (!active || !active->flags.valid)
644 break;
645 if (tz->temperature >= active->temperature) {
646 /*
647 * Above Threshold?
648 * ----------------
649 * If not already enabled, turn ON all cooling devices
650 * associated with this active threshold.
651 */
652 if (active->temperature > maxtemp)
653 tz->state.active_index = i;
654 maxtemp = active->temperature;
655 if (active->flags.enabled)
656 continue;
657 for (j = 0; j < active->devices.count; j++) {
658 result =
659 acpi_bus_set_power(active->devices.
660 handles[j],
661 ACPI_STATE_D0);
662 if (result) {
663 printk(KERN_WARNING PREFIX
664 "Unable to turn cooling device [%p] 'on'\n",
665 active->devices.
666 handles[j]);
667 continue;
668 }
669 active->flags.enabled = 1;
670 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
671 "Cooling device [%p] now 'on'\n",
672 active->devices.handles[j]));
673 }
674 continue;
675 }
676 if (!active->flags.enabled)
677 continue;
678 /*
679 * Below Threshold?
680 * ----------------
681 * Turn OFF all cooling devices associated with this
682 * threshold.
683 */
684 for (j = 0; j < active->devices.count; j++) {
685 result = acpi_bus_set_power(active->devices.handles[j],
686 ACPI_STATE_D3);
687 if (result) {
688 printk(KERN_WARNING PREFIX
689 "Unable to turn cooling device [%p] 'off'\n",
690 active->devices.handles[j]);
691 continue;
692 }
693 active->flags.enabled = 0;
694 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
695 "Cooling device [%p] now 'off'\n",
696 active->devices.handles[j]));
697 }
698 }
699 }
700
701 static void acpi_thermal_check(void *context);
702
703 static void acpi_thermal_run(unsigned long data)
704 {
705 struct acpi_thermal *tz = (struct acpi_thermal *)data;
706 if (!tz->zombie)
707 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
708 }
709
710 static void acpi_thermal_check(void *data)
711 {
712 int result = 0;
713 struct acpi_thermal *tz = data;
714 unsigned long sleep_time = 0;
715 unsigned long timeout_jiffies = 0;
716 int i = 0;
717 struct acpi_thermal_state state;
718
719
720 if (!tz) {
721 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
722 return;
723 }
724
725 /* Check if someone else is already running */
726 if (!mutex_trylock(&tz->lock))
727 return;
728
729 state = tz->state;
730
731 result = acpi_thermal_get_temperature(tz);
732 if (result)
733 goto unlock;
734
735 memset(&tz->state, 0, sizeof(tz->state));
736
737 /*
738 * Check Trip Points
739 * -----------------
740 * Compare the current temperature to the trip point values to see
741 * if we've entered one of the thermal policy states. Note that
742 * this function determines when a state is entered, but the
743 * individual policy decides when it is exited (e.g. hysteresis).
744 */
745 if (tz->trips.critical.flags.valid)
746 state.critical |=
747 (tz->temperature >= tz->trips.critical.temperature);
748 if (tz->trips.hot.flags.valid)
749 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
750 if (tz->trips.passive.flags.valid)
751 state.passive |=
752 (tz->temperature >= tz->trips.passive.temperature);
753 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
754 if (tz->trips.active[i].flags.valid)
755 state.active |=
756 (tz->temperature >=
757 tz->trips.active[i].temperature);
758
759 /*
760 * Invoke Policy
761 * -------------
762 * Separated from the above check to allow individual policy to
763 * determine when to exit a given state.
764 */
765 if (state.critical)
766 acpi_thermal_critical(tz);
767 if (state.hot)
768 acpi_thermal_hot(tz);
769 if (state.passive)
770 acpi_thermal_passive(tz);
771 if (state.active)
772 acpi_thermal_active(tz);
773
774 /*
775 * Calculate State
776 * ---------------
777 * Again, separated from the above two to allow independent policy
778 * decisions.
779 */
780 tz->state.critical = tz->trips.critical.flags.enabled;
781 tz->state.hot = tz->trips.hot.flags.enabled;
782 tz->state.passive = tz->trips.passive.flags.enabled;
783 tz->state.active = 0;
784 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
785 tz->state.active |= tz->trips.active[i].flags.enabled;
786
787 /*
788 * Calculate Sleep Time
789 * --------------------
790 * If we're in the passive state, use _TSP's value. Otherwise
791 * use the default polling frequency (e.g. _TZP). If no polling
792 * frequency is specified then we'll wait forever (at least until
793 * a thermal event occurs). Note that _TSP and _TZD values are
794 * given in 1/10th seconds (we must covert to milliseconds).
795 */
796 if (tz->state.passive) {
797 sleep_time = tz->trips.passive.tsp * 100;
798 timeout_jiffies = jiffies + (HZ * sleep_time) / 1000;
799 } else if (tz->polling_frequency > 0) {
800 sleep_time = tz->polling_frequency * 100;
801 timeout_jiffies = round_jiffies(jiffies + (HZ * sleep_time) / 1000);
802 }
803
804 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
805 tz->name, tz->temperature, sleep_time));
806
807 /*
808 * Schedule Next Poll
809 * ------------------
810 */
811 if (!sleep_time) {
812 if (timer_pending(&(tz->timer)))
813 del_timer(&(tz->timer));
814 } else {
815 if (timer_pending(&(tz->timer)))
816 mod_timer(&(tz->timer), timeout_jiffies);
817 else {
818 tz->timer.data = (unsigned long)tz;
819 tz->timer.function = acpi_thermal_run;
820 tz->timer.expires = timeout_jiffies;
821 add_timer(&(tz->timer));
822 }
823 }
824 unlock:
825 mutex_unlock(&tz->lock);
826 }
827
828 /* --------------------------------------------------------------------------
829 FS Interface (/proc)
830 -------------------------------------------------------------------------- */
831
832 static struct proc_dir_entry *acpi_thermal_dir;
833
834 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
835 {
836 struct acpi_thermal *tz = seq->private;
837
838
839 if (!tz)
840 goto end;
841
842 seq_puts(seq, "state: ");
843
844 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
845 && !tz->state.active)
846 seq_puts(seq, "ok\n");
847 else {
848 if (tz->state.critical)
849 seq_puts(seq, "critical ");
850 if (tz->state.hot)
851 seq_puts(seq, "hot ");
852 if (tz->state.passive)
853 seq_puts(seq, "passive ");
854 if (tz->state.active)
855 seq_printf(seq, "active[%d]", tz->state.active_index);
856 seq_puts(seq, "\n");
857 }
858
859 end:
860 return 0;
861 }
862
863 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
864 {
865 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
866 }
867
868 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
869 {
870 int result = 0;
871 struct acpi_thermal *tz = seq->private;
872
873
874 if (!tz)
875 goto end;
876
877 result = acpi_thermal_get_temperature(tz);
878 if (result)
879 goto end;
880
881 seq_printf(seq, "temperature: %ld C\n",
882 KELVIN_TO_CELSIUS(tz->temperature));
883
884 end:
885 return 0;
886 }
887
888 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
889 {
890 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
891 }
892
893 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
894 {
895 struct acpi_thermal *tz = seq->private;
896 struct acpi_device *device;
897 acpi_status status;
898
899 int i = 0;
900 int j = 0;
901
902
903 if (!tz)
904 goto end;
905
906 if (tz->trips.critical.flags.valid)
907 seq_printf(seq, "critical (S5): %ld C%s",
908 KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
909 nocrt ? " <disabled>\n" : "\n");
910
911 if (tz->trips.hot.flags.valid)
912 seq_printf(seq, "hot (S4): %ld C%s",
913 KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
914 nocrt ? " <disabled>\n" : "\n");
915
916 if (tz->trips.passive.flags.valid) {
917 seq_printf(seq,
918 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
919 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
920 tz->trips.passive.tc1, tz->trips.passive.tc2,
921 tz->trips.passive.tsp);
922 for (j = 0; j < tz->trips.passive.devices.count; j++) {
923 status = acpi_bus_get_device(tz->trips.passive.devices.
924 handles[j], &device);
925 seq_printf(seq, "%4.4s ", status ? "" :
926 acpi_device_bid(device));
927 }
928 seq_puts(seq, "\n");
929 }
930
931 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
932 if (!(tz->trips.active[i].flags.valid))
933 break;
934 seq_printf(seq, "active[%d]: %ld C: devices=",
935 i,
936 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
937 for (j = 0; j < tz->trips.active[i].devices.count; j++){
938 status = acpi_bus_get_device(tz->trips.active[i].
939 devices.handles[j],
940 &device);
941 seq_printf(seq, "%4.4s ", status ? "" :
942 acpi_device_bid(device));
943 }
944 seq_puts(seq, "\n");
945 }
946
947 end:
948 return 0;
949 }
950
951 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
952 {
953 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
954 }
955
956 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
957 {
958 struct acpi_thermal *tz = seq->private;
959
960
961 if (!tz)
962 goto end;
963
964 if (!tz->flags.cooling_mode)
965 seq_puts(seq, "<setting not supported>\n");
966 else
967 seq_puts(seq, "0 - Active; 1 - Passive\n");
968
969 end:
970 return 0;
971 }
972
973 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
974 {
975 return single_open(file, acpi_thermal_cooling_seq_show,
976 PDE(inode)->data);
977 }
978
979 static ssize_t
980 acpi_thermal_write_cooling_mode(struct file *file,
981 const char __user * buffer,
982 size_t count, loff_t * ppos)
983 {
984 struct seq_file *m = file->private_data;
985 struct acpi_thermal *tz = m->private;
986 int result = 0;
987 char mode_string[12] = { '\0' };
988
989
990 if (!tz || (count > sizeof(mode_string) - 1))
991 return -EINVAL;
992
993 if (!tz->flags.cooling_mode)
994 return -ENODEV;
995
996 if (copy_from_user(mode_string, buffer, count))
997 return -EFAULT;
998
999 mode_string[count] = '\0';
1000
1001 result = acpi_thermal_set_cooling_mode(tz,
1002 simple_strtoul(mode_string, NULL,
1003 0));
1004 if (result)
1005 return result;
1006
1007 acpi_thermal_check(tz);
1008
1009 return count;
1010 }
1011
1012 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1013 {
1014 struct acpi_thermal *tz = seq->private;
1015
1016
1017 if (!tz)
1018 goto end;
1019
1020 if (!tz->polling_frequency) {
1021 seq_puts(seq, "<polling disabled>\n");
1022 goto end;
1023 }
1024
1025 seq_printf(seq, "polling frequency: %lu seconds\n",
1026 (tz->polling_frequency / 10));
1027
1028 end:
1029 return 0;
1030 }
1031
1032 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1033 {
1034 return single_open(file, acpi_thermal_polling_seq_show,
1035 PDE(inode)->data);
1036 }
1037
1038 static ssize_t
1039 acpi_thermal_write_polling(struct file *file,
1040 const char __user * buffer,
1041 size_t count, loff_t * ppos)
1042 {
1043 struct seq_file *m = file->private_data;
1044 struct acpi_thermal *tz = m->private;
1045 int result = 0;
1046 char polling_string[12] = { '\0' };
1047 int seconds = 0;
1048
1049
1050 if (!tz || (count > sizeof(polling_string) - 1))
1051 return -EINVAL;
1052
1053 if (copy_from_user(polling_string, buffer, count))
1054 return -EFAULT;
1055
1056 polling_string[count] = '\0';
1057
1058 seconds = simple_strtoul(polling_string, NULL, 0);
1059
1060 result = acpi_thermal_set_polling(tz, seconds);
1061 if (result)
1062 return result;
1063
1064 acpi_thermal_check(tz);
1065
1066 return count;
1067 }
1068
1069 static int acpi_thermal_add_fs(struct acpi_device *device)
1070 {
1071 struct proc_dir_entry *entry = NULL;
1072
1073
1074 if (!acpi_device_dir(device)) {
1075 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1076 acpi_thermal_dir);
1077 if (!acpi_device_dir(device))
1078 return -ENODEV;
1079 acpi_device_dir(device)->owner = THIS_MODULE;
1080 }
1081
1082 /* 'state' [R] */
1083 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1084 S_IRUGO, acpi_device_dir(device));
1085 if (!entry)
1086 return -ENODEV;
1087 else {
1088 entry->proc_fops = &acpi_thermal_state_fops;
1089 entry->data = acpi_driver_data(device);
1090 entry->owner = THIS_MODULE;
1091 }
1092
1093 /* 'temperature' [R] */
1094 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1095 S_IRUGO, acpi_device_dir(device));
1096 if (!entry)
1097 return -ENODEV;
1098 else {
1099 entry->proc_fops = &acpi_thermal_temp_fops;
1100 entry->data = acpi_driver_data(device);
1101 entry->owner = THIS_MODULE;
1102 }
1103
1104 /* 'trip_points' [R] */
1105 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1106 S_IRUGO,
1107 acpi_device_dir(device));
1108 if (!entry)
1109 return -ENODEV;
1110 else {
1111 entry->proc_fops = &acpi_thermal_trip_fops;
1112 entry->data = acpi_driver_data(device);
1113 entry->owner = THIS_MODULE;
1114 }
1115
1116 /* 'cooling_mode' [R/W] */
1117 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1118 S_IFREG | S_IRUGO | S_IWUSR,
1119 acpi_device_dir(device));
1120 if (!entry)
1121 return -ENODEV;
1122 else {
1123 entry->proc_fops = &acpi_thermal_cooling_fops;
1124 entry->data = acpi_driver_data(device);
1125 entry->owner = THIS_MODULE;
1126 }
1127
1128 /* 'polling_frequency' [R/W] */
1129 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1130 S_IFREG | S_IRUGO | S_IWUSR,
1131 acpi_device_dir(device));
1132 if (!entry)
1133 return -ENODEV;
1134 else {
1135 entry->proc_fops = &acpi_thermal_polling_fops;
1136 entry->data = acpi_driver_data(device);
1137 entry->owner = THIS_MODULE;
1138 }
1139
1140 return 0;
1141 }
1142
1143 static int acpi_thermal_remove_fs(struct acpi_device *device)
1144 {
1145
1146 if (acpi_device_dir(device)) {
1147 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1148 acpi_device_dir(device));
1149 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1150 acpi_device_dir(device));
1151 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1152 acpi_device_dir(device));
1153 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1154 acpi_device_dir(device));
1155 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1156 acpi_device_dir(device));
1157 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1158 acpi_device_dir(device) = NULL;
1159 }
1160
1161 return 0;
1162 }
1163
1164 /* --------------------------------------------------------------------------
1165 Driver Interface
1166 -------------------------------------------------------------------------- */
1167
1168 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1169 {
1170 struct acpi_thermal *tz = data;
1171 struct acpi_device *device = NULL;
1172
1173
1174 if (!tz)
1175 return;
1176
1177 device = tz->device;
1178
1179 switch (event) {
1180 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1181 acpi_thermal_check(tz);
1182 break;
1183 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1184 acpi_thermal_get_trip_points(tz);
1185 acpi_thermal_check(tz);
1186 acpi_bus_generate_proc_event(device, event, 0);
1187 acpi_bus_generate_netlink_event(device->pnp.device_class,
1188 device->dev.bus_id, event, 0);
1189 break;
1190 case ACPI_THERMAL_NOTIFY_DEVICES:
1191 if (tz->flags.devices)
1192 acpi_thermal_get_devices(tz);
1193 acpi_bus_generate_proc_event(device, event, 0);
1194 acpi_bus_generate_netlink_event(device->pnp.device_class,
1195 device->dev.bus_id, event, 0);
1196 break;
1197 default:
1198 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1199 "Unsupported event [0x%x]\n", event));
1200 break;
1201 }
1202
1203 return;
1204 }
1205
1206 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1207 {
1208 int result = 0;
1209
1210
1211 if (!tz)
1212 return -EINVAL;
1213
1214 /* Get temperature [_TMP] (required) */
1215 result = acpi_thermal_get_temperature(tz);
1216 if (result)
1217 return result;
1218
1219 /* Get trip points [_CRT, _PSV, etc.] (required) */
1220 result = acpi_thermal_get_trip_points(tz);
1221 if (result)
1222 return result;
1223
1224 /* Set the cooling mode [_SCP] to active cooling (default) */
1225 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1226 if (!result)
1227 tz->flags.cooling_mode = 1;
1228
1229 /* Get default polling frequency [_TZP] (optional) */
1230 if (tzp)
1231 tz->polling_frequency = tzp;
1232 else
1233 acpi_thermal_get_polling_frequency(tz);
1234
1235 /* Get devices in this thermal zone [_TZD] (optional) */
1236 result = acpi_thermal_get_devices(tz);
1237 if (!result)
1238 tz->flags.devices = 1;
1239
1240 return 0;
1241 }
1242
1243 static int acpi_thermal_add(struct acpi_device *device)
1244 {
1245 int result = 0;
1246 acpi_status status = AE_OK;
1247 struct acpi_thermal *tz = NULL;
1248
1249
1250 if (!device)
1251 return -EINVAL;
1252
1253 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1254 if (!tz)
1255 return -ENOMEM;
1256
1257 tz->device = device;
1258 strcpy(tz->name, device->pnp.bus_id);
1259 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1260 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1261 acpi_driver_data(device) = tz;
1262 mutex_init(&tz->lock);
1263 result = acpi_thermal_get_info(tz);
1264 if (result)
1265 goto end;
1266
1267 result = acpi_thermal_add_fs(device);
1268 if (result)
1269 goto end;
1270
1271 init_timer(&tz->timer);
1272
1273 acpi_thermal_check(tz);
1274
1275 status = acpi_install_notify_handler(device->handle,
1276 ACPI_DEVICE_NOTIFY,
1277 acpi_thermal_notify, tz);
1278 if (ACPI_FAILURE(status)) {
1279 result = -ENODEV;
1280 goto end;
1281 }
1282
1283 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1284 acpi_device_name(device), acpi_device_bid(device),
1285 KELVIN_TO_CELSIUS(tz->temperature));
1286
1287 end:
1288 if (result) {
1289 acpi_thermal_remove_fs(device);
1290 kfree(tz);
1291 }
1292
1293 return result;
1294 }
1295
1296 static int acpi_thermal_remove(struct acpi_device *device, int type)
1297 {
1298 acpi_status status = AE_OK;
1299 struct acpi_thermal *tz = NULL;
1300
1301
1302 if (!device || !acpi_driver_data(device))
1303 return -EINVAL;
1304
1305 tz = acpi_driver_data(device);
1306
1307 /* avoid timer adding new defer task */
1308 tz->zombie = 1;
1309 /* wait for running timer (on other CPUs) finish */
1310 del_timer_sync(&(tz->timer));
1311 /* synchronize deferred task */
1312 acpi_os_wait_events_complete(NULL);
1313 /* deferred task may reinsert timer */
1314 del_timer_sync(&(tz->timer));
1315
1316 status = acpi_remove_notify_handler(device->handle,
1317 ACPI_DEVICE_NOTIFY,
1318 acpi_thermal_notify);
1319
1320 /* Terminate policy */
1321 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1322 tz->trips.passive.flags.enabled = 0;
1323 acpi_thermal_passive(tz);
1324 }
1325 if (tz->trips.active[0].flags.valid
1326 && tz->trips.active[0].flags.enabled) {
1327 tz->trips.active[0].flags.enabled = 0;
1328 acpi_thermal_active(tz);
1329 }
1330
1331 acpi_thermal_remove_fs(device);
1332 mutex_destroy(&tz->lock);
1333 kfree(tz);
1334 return 0;
1335 }
1336
1337 static int acpi_thermal_resume(struct acpi_device *device)
1338 {
1339 struct acpi_thermal *tz = NULL;
1340 int i, j, power_state, result;
1341
1342
1343 if (!device || !acpi_driver_data(device))
1344 return -EINVAL;
1345
1346 tz = acpi_driver_data(device);
1347
1348 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1349 if (!(&tz->trips.active[i]))
1350 break;
1351 if (!tz->trips.active[i].flags.valid)
1352 break;
1353 tz->trips.active[i].flags.enabled = 1;
1354 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1355 result = acpi_bus_get_power(tz->trips.active[i].devices.
1356 handles[j], &power_state);
1357 if (result || (power_state != ACPI_STATE_D0)) {
1358 tz->trips.active[i].flags.enabled = 0;
1359 break;
1360 }
1361 }
1362 tz->state.active |= tz->trips.active[i].flags.enabled;
1363 }
1364
1365 acpi_thermal_check(tz);
1366
1367 return AE_OK;
1368 }
1369
1370 #ifdef CONFIG_DMI
1371 static int thermal_act(const struct dmi_system_id *d) {
1372
1373 if (act == 0) {
1374 printk(KERN_NOTICE "ACPI: %s detected: "
1375 "disabling all active thermal trip points\n", d->ident);
1376 act = -1;
1377 }
1378 return 0;
1379 }
1380 static int thermal_nocrt(const struct dmi_system_id *d) {
1381
1382 printk(KERN_NOTICE "ACPI: %s detected: "
1383 "disabling all critical thermal trip point actions.\n", d->ident);
1384 nocrt = 1;
1385 return 0;
1386 }
1387 static int thermal_tzp(const struct dmi_system_id *d) {
1388
1389 if (tzp == 0) {
1390 printk(KERN_NOTICE "ACPI: %s detected: "
1391 "enabling thermal zone polling\n", d->ident);
1392 tzp = 300; /* 300 dS = 30 Seconds */
1393 }
1394 return 0;
1395 }
1396 static int thermal_psv(const struct dmi_system_id *d) {
1397
1398 if (psv == 0) {
1399 printk(KERN_NOTICE "ACPI: %s detected: "
1400 "disabling all passive thermal trip points\n", d->ident);
1401 psv = -1;
1402 }
1403 return 0;
1404 }
1405
1406 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1407 /*
1408 * Award BIOS on this AOpen makes thermal control almost worthless.
1409 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1410 */
1411 {
1412 .callback = thermal_act,
1413 .ident = "AOpen i915GMm-HFS",
1414 .matches = {
1415 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1416 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1417 },
1418 },
1419 {
1420 .callback = thermal_psv,
1421 .ident = "AOpen i915GMm-HFS",
1422 .matches = {
1423 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1424 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1425 },
1426 },
1427 {
1428 .callback = thermal_tzp,
1429 .ident = "AOpen i915GMm-HFS",
1430 .matches = {
1431 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1432 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1433 },
1434 },
1435 {
1436 .callback = thermal_nocrt,
1437 .ident = "Gigabyte GA-7ZX",
1438 .matches = {
1439 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1440 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1441 },
1442 },
1443 {}
1444 };
1445 #endif /* CONFIG_DMI */
1446
1447 static int __init acpi_thermal_init(void)
1448 {
1449 int result = 0;
1450
1451 dmi_check_system(thermal_dmi_table);
1452
1453 if (off) {
1454 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1455 return -ENODEV;
1456 }
1457 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1458 if (!acpi_thermal_dir)
1459 return -ENODEV;
1460 acpi_thermal_dir->owner = THIS_MODULE;
1461
1462 result = acpi_bus_register_driver(&acpi_thermal_driver);
1463 if (result < 0) {
1464 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1465 return -ENODEV;
1466 }
1467
1468 return 0;
1469 }
1470
1471 static void __exit acpi_thermal_exit(void)
1472 {
1473
1474 acpi_bus_unregister_driver(&acpi_thermal_driver);
1475
1476 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1477
1478 return;
1479 }
1480
1481 module_init(acpi_thermal_init);
1482 module_exit(acpi_thermal_exit);
WRT350N Kernel Patches