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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 *
8 * This driver fully implements the ACPI thermal policy as described in the
9 * ACPI 2.0 Specification.
10 *
11 * TBD: 1. Implement passive cooling hysteresis.
12 * 2. Enhance passive cooling (CPU) states/limit interface to support
13 * concepts of 'multiple limiters', upper/lower limits, etc.
14 */
15
16#define pr_fmt(fmt) "ACPI: thermal: " fmt
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/dmi.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <linux/types.h>
24#include <linux/jiffies.h>
25#include <linux/kmod.h>
26#include <linux/reboot.h>
27#include <linux/device.h>
28#include <linux/thermal.h>
29#include <linux/acpi.h>
30#include <linux/workqueue.h>
31#include <linux/uaccess.h>
32#include <linux/units.h>
33
34#include "internal.h"
35
36#define ACPI_THERMAL_CLASS "thermal_zone"
37#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
38#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
39#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
40#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
41#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
42#define ACPI_THERMAL_NOTIFY_HOT 0xF1
43#define ACPI_THERMAL_MODE_ACTIVE 0x00
44
45#define ACPI_THERMAL_MAX_ACTIVE 10
46#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
47
48#define ACPI_THERMAL_TRIP_PASSIVE (-1)
49
50#define ACPI_THERMAL_MAX_NR_TRIPS (ACPI_THERMAL_MAX_ACTIVE + 3)
51
52/*
53 * This exception is thrown out in two cases:
54 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
55 * when re-evaluating the AML code.
56 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
57 * We need to re-bind the cooling devices of a thermal zone when this occurs.
58 */
59#define ACPI_THERMAL_TRIPS_EXCEPTION(tz, str) \
60do { \
61 acpi_handle_info(tz->device->handle, \
62 "ACPI thermal trip point %s changed\n" \
63 "Please report to linux-acpi@vger.kernel.org\n", str); \
64} while (0)
65
66static int act;
67module_param(act, int, 0644);
68MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
69
70static int crt;
71module_param(crt, int, 0644);
72MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
73
74static int tzp;
75module_param(tzp, int, 0444);
76MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
77
78static int off;
79module_param(off, int, 0);
80MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
81
82static int psv;
83module_param(psv, int, 0644);
84MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
85
86static struct workqueue_struct *acpi_thermal_pm_queue;
87
88struct acpi_thermal_trip {
89 unsigned long temp_dk;
90 struct acpi_handle_list devices;
91};
92
93struct acpi_thermal_passive {
94 struct acpi_thermal_trip trip;
95 unsigned long tc1;
96 unsigned long tc2;
97 unsigned long delay;
98};
99
100struct acpi_thermal_active {
101 struct acpi_thermal_trip trip;
102};
103
104struct acpi_thermal_trips {
105 struct acpi_thermal_passive passive;
106 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
107};
108
109struct acpi_thermal {
110 struct acpi_device *device;
111 acpi_bus_id name;
112 unsigned long temp_dk;
113 unsigned long last_temp_dk;
114 unsigned long polling_frequency;
115 volatile u8 zombie;
116 struct acpi_thermal_trips trips;
117 struct thermal_zone_device *thermal_zone;
118 int kelvin_offset; /* in millidegrees */
119 struct work_struct thermal_check_work;
120 struct mutex thermal_check_lock;
121 refcount_t thermal_check_count;
122};
123
124/* --------------------------------------------------------------------------
125 Thermal Zone Management
126 -------------------------------------------------------------------------- */
127
128static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
129{
130 acpi_status status = AE_OK;
131 unsigned long long tmp;
132
133 if (!tz)
134 return -EINVAL;
135
136 tz->last_temp_dk = tz->temp_dk;
137
138 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
139 if (ACPI_FAILURE(status))
140 return -ENODEV;
141
142 tz->temp_dk = tmp;
143
144 acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n",
145 tz->temp_dk);
146
147 return 0;
148}
149
150static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
151{
152 acpi_status status = AE_OK;
153 unsigned long long tmp;
154
155 if (!tz)
156 return -EINVAL;
157
158 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
159 if (ACPI_FAILURE(status))
160 return -ENODEV;
161
162 tz->polling_frequency = tmp;
163 acpi_handle_debug(tz->device->handle, "Polling frequency is %lu dS\n",
164 tz->polling_frequency);
165
166 return 0;
167}
168
169static int acpi_thermal_temp(struct acpi_thermal *tz, int temp_deci_k)
170{
171 int temp;
172
173 if (temp_deci_k == THERMAL_TEMP_INVALID)
174 return THERMAL_TEMP_INVALID;
175
176 temp = deci_kelvin_to_millicelsius_with_offset(temp_deci_k,
177 tz->kelvin_offset);
178 if (temp <= 0)
179 return THERMAL_TEMP_INVALID;
180
181 return temp;
182}
183
184static bool acpi_thermal_trip_valid(struct acpi_thermal_trip *acpi_trip)
185{
186 return acpi_trip->temp_dk != THERMAL_TEMP_INVALID;
187}
188
189static int active_trip_index(struct acpi_thermal *tz,
190 struct acpi_thermal_trip *acpi_trip)
191{
192 struct acpi_thermal_active *active;
193
194 active = container_of(acpi_trip, struct acpi_thermal_active, trip);
195 return active - tz->trips.active;
196}
197
198static long get_passive_temp(struct acpi_thermal *tz)
199{
200 int temp;
201
202 if (acpi_passive_trip_temp(tz->device, &temp))
203 return THERMAL_TEMP_INVALID;
204
205 return temp;
206}
207
208static long get_active_temp(struct acpi_thermal *tz, int index)
209{
210 int temp;
211
212 if (acpi_active_trip_temp(tz->device, index, &temp))
213 return THERMAL_TEMP_INVALID;
214
215 /*
216 * If an override has been provided, apply it so there are no active
217 * trips with thresholds greater than the override.
218 */
219 if (act > 0) {
220 unsigned long long override = celsius_to_deci_kelvin(act);
221
222 if (temp > override)
223 return override;
224 }
225 return temp;
226}
227
228static void acpi_thermal_update_trip(struct acpi_thermal *tz,
229 const struct thermal_trip *trip)
230{
231 struct acpi_thermal_trip *acpi_trip = trip->priv;
232
233 if (trip->type == THERMAL_TRIP_PASSIVE) {
234 if (psv > 0)
235 return;
236
237 acpi_trip->temp_dk = get_passive_temp(tz);
238 } else {
239 int index = active_trip_index(tz, acpi_trip);
240
241 acpi_trip->temp_dk = get_active_temp(tz, index);
242 }
243
244 if (!acpi_thermal_trip_valid(acpi_trip))
245 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
246}
247
248static bool update_trip_devices(struct acpi_thermal *tz,
249 struct acpi_thermal_trip *acpi_trip,
250 int index, bool compare)
251{
252 struct acpi_handle_list devices = { 0 };
253 char method[] = "_PSL";
254
255 if (index != ACPI_THERMAL_TRIP_PASSIVE) {
256 method[1] = 'A';
257 method[2] = 'L';
258 method[3] = '0' + index;
259 }
260
261 if (!acpi_evaluate_reference(tz->device->handle, method, NULL, &devices)) {
262 acpi_handle_info(tz->device->handle, "%s evaluation failure\n", method);
263 return false;
264 }
265
266 if (acpi_handle_list_equal(&acpi_trip->devices, &devices)) {
267 acpi_handle_list_free(&devices);
268 return true;
269 }
270
271 if (compare)
272 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "device");
273
274 acpi_handle_list_replace(&acpi_trip->devices, &devices);
275 return true;
276}
277
278static void acpi_thermal_update_trip_devices(struct acpi_thermal *tz,
279 const struct thermal_trip *trip)
280{
281 struct acpi_thermal_trip *acpi_trip = trip->priv;
282 int index = trip->type == THERMAL_TRIP_PASSIVE ?
283 ACPI_THERMAL_TRIP_PASSIVE : active_trip_index(tz, acpi_trip);
284
285 if (update_trip_devices(tz, acpi_trip, index, true))
286 return;
287
288 acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
289 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
290}
291
292struct adjust_trip_data {
293 struct acpi_thermal *tz;
294 u32 event;
295};
296
297static int acpi_thermal_adjust_trip(struct thermal_trip *trip, void *data)
298{
299 struct acpi_thermal_trip *acpi_trip = trip->priv;
300 struct adjust_trip_data *atd = data;
301 struct acpi_thermal *tz = atd->tz;
302 int temp;
303
304 if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
305 return 0;
306
307 if (atd->event == ACPI_THERMAL_NOTIFY_THRESHOLDS)
308 acpi_thermal_update_trip(tz, trip);
309 else
310 acpi_thermal_update_trip_devices(tz, trip);
311
312 if (acpi_thermal_trip_valid(acpi_trip))
313 temp = acpi_thermal_temp(tz, acpi_trip->temp_dk);
314 else
315 temp = THERMAL_TEMP_INVALID;
316
317 thermal_zone_set_trip_temp(tz->thermal_zone, trip, temp);
318
319 return 0;
320}
321
322static void acpi_queue_thermal_check(struct acpi_thermal *tz)
323{
324 if (!work_pending(&tz->thermal_check_work))
325 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
326}
327
328static void acpi_thermal_trips_update(struct acpi_thermal *tz, u32 event)
329{
330 struct adjust_trip_data atd = { .tz = tz, .event = event };
331 struct acpi_device *adev = tz->device;
332
333 /*
334 * Use thermal_zone_for_each_trip() to carry out the trip points
335 * update, so as to protect thermal_get_trend() from getting stale
336 * trip point temperatures and to prevent thermal_zone_device_update()
337 * invoked from acpi_thermal_check_fn() from producing inconsistent
338 * results.
339 */
340 thermal_zone_for_each_trip(tz->thermal_zone,
341 acpi_thermal_adjust_trip, &atd);
342 acpi_queue_thermal_check(tz);
343 acpi_bus_generate_netlink_event(adev->pnp.device_class,
344 dev_name(&adev->dev), event, 0);
345}
346
347static int acpi_thermal_get_critical_trip(struct acpi_thermal *tz)
348{
349 int temp;
350
351 if (crt > 0) {
352 temp = celsius_to_deci_kelvin(crt);
353 goto set;
354 }
355 if (crt == -1) {
356 acpi_handle_debug(tz->device->handle, "Critical threshold disabled\n");
357 return THERMAL_TEMP_INVALID;
358 }
359
360 if (acpi_critical_trip_temp(tz->device, &temp))
361 return THERMAL_TEMP_INVALID;
362
363 if (temp <= 2732) {
364 /*
365 * Below zero (Celsius) values clearly aren't right for sure,
366 * so discard them as invalid.
367 */
368 pr_info(FW_BUG "Invalid critical threshold (%d)\n", temp);
369 return THERMAL_TEMP_INVALID;
370 }
371
372set:
373 acpi_handle_debug(tz->device->handle, "Critical threshold [%d]\n", temp);
374 return temp;
375}
376
377static int acpi_thermal_get_hot_trip(struct acpi_thermal *tz)
378{
379 int temp;
380
381 if (acpi_hot_trip_temp(tz->device, &temp) || temp == THERMAL_TEMP_INVALID) {
382 acpi_handle_debug(tz->device->handle, "No hot threshold\n");
383 return THERMAL_TEMP_INVALID;
384 }
385
386 acpi_handle_debug(tz->device->handle, "Hot threshold [%d]\n", temp);
387 return temp;
388}
389
390static bool passive_trip_params_init(struct acpi_thermal *tz)
391{
392 unsigned long long tmp;
393 acpi_status status;
394
395 status = acpi_evaluate_integer(tz->device->handle, "_TC1", NULL, &tmp);
396 if (ACPI_FAILURE(status))
397 return false;
398
399 tz->trips.passive.tc1 = tmp;
400
401 status = acpi_evaluate_integer(tz->device->handle, "_TC2", NULL, &tmp);
402 if (ACPI_FAILURE(status))
403 return false;
404
405 tz->trips.passive.tc2 = tmp;
406
407 status = acpi_evaluate_integer(tz->device->handle, "_TFP", NULL, &tmp);
408 if (ACPI_SUCCESS(status)) {
409 tz->trips.passive.delay = tmp;
410 return true;
411 }
412
413 status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp);
414 if (ACPI_FAILURE(status))
415 return false;
416
417 tz->trips.passive.delay = tmp * 100;
418
419 return true;
420}
421
422static bool acpi_thermal_init_trip(struct acpi_thermal *tz, int index)
423{
424 struct acpi_thermal_trip *acpi_trip;
425 long temp;
426
427 if (index == ACPI_THERMAL_TRIP_PASSIVE) {
428 acpi_trip = &tz->trips.passive.trip;
429
430 if (psv == -1)
431 goto fail;
432
433 if (!passive_trip_params_init(tz))
434 goto fail;
435
436 temp = psv > 0 ? celsius_to_deci_kelvin(psv) :
437 get_passive_temp(tz);
438 } else {
439 acpi_trip = &tz->trips.active[index].trip;
440
441 if (act == -1)
442 goto fail;
443
444 temp = get_active_temp(tz, index);
445 }
446
447 if (temp == THERMAL_TEMP_INVALID)
448 goto fail;
449
450 if (!update_trip_devices(tz, acpi_trip, index, false))
451 goto fail;
452
453 acpi_trip->temp_dk = temp;
454 return true;
455
456fail:
457 acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
458 return false;
459}
460
461static void acpi_thermal_get_trip_points(struct acpi_thermal *tz)
462{
463 int i;
464
465 acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE);
466
467 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
468 if (!acpi_thermal_init_trip(tz, i))
469 break;
470 }
471
472 while (++i < ACPI_THERMAL_MAX_ACTIVE)
473 tz->trips.active[i].trip.temp_dk = THERMAL_TEMP_INVALID;
474}
475
476/* sys I/F for generic thermal sysfs support */
477
478static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
479{
480 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
481 int result;
482
483 if (!tz)
484 return -EINVAL;
485
486 result = acpi_thermal_get_temperature(tz);
487 if (result)
488 return result;
489
490 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temp_dk,
491 tz->kelvin_offset);
492 return 0;
493}
494
495static int thermal_get_trend(struct thermal_zone_device *thermal,
496 const struct thermal_trip *trip,
497 enum thermal_trend *trend)
498{
499 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
500 struct acpi_thermal_trip *acpi_trip;
501 int t;
502
503 if (!tz || !trip)
504 return -EINVAL;
505
506 acpi_trip = trip->priv;
507 if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
508 return -EINVAL;
509
510 switch (trip->type) {
511 case THERMAL_TRIP_PASSIVE:
512 t = tz->trips.passive.tc1 * (tz->temp_dk -
513 tz->last_temp_dk) +
514 tz->trips.passive.tc2 * (tz->temp_dk -
515 acpi_trip->temp_dk);
516 if (t > 0)
517 *trend = THERMAL_TREND_RAISING;
518 else if (t < 0)
519 *trend = THERMAL_TREND_DROPPING;
520 else
521 *trend = THERMAL_TREND_STABLE;
522
523 return 0;
524
525 case THERMAL_TRIP_ACTIVE:
526 t = acpi_thermal_temp(tz, tz->temp_dk);
527 if (t <= trip->temperature)
528 break;
529
530 *trend = THERMAL_TREND_RAISING;
531
532 return 0;
533
534 default:
535 break;
536 }
537
538 return -EINVAL;
539}
540
541static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
542{
543 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
544
545 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
546 dev_name(&tz->device->dev),
547 ACPI_THERMAL_NOTIFY_HOT, 1);
548}
549
550static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
551{
552 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
553
554 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
555 dev_name(&tz->device->dev),
556 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
557
558 thermal_zone_device_critical(thermal);
559}
560
561static bool acpi_thermal_should_bind_cdev(struct thermal_zone_device *thermal,
562 const struct thermal_trip *trip,
563 struct thermal_cooling_device *cdev,
564 struct cooling_spec *c)
565{
566 struct acpi_thermal_trip *acpi_trip = trip->priv;
567 struct acpi_device *cdev_adev = cdev->devdata;
568 int i;
569
570 /* Skip critical and hot trips. */
571 if (!acpi_trip)
572 return false;
573
574 for (i = 0; i < acpi_trip->devices.count; i++) {
575 acpi_handle handle = acpi_trip->devices.handles[i];
576
577 if (acpi_fetch_acpi_dev(handle) == cdev_adev)
578 return true;
579 }
580
581 return false;
582}
583
584static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
585 .should_bind = acpi_thermal_should_bind_cdev,
586 .get_temp = thermal_get_temp,
587 .get_trend = thermal_get_trend,
588 .hot = acpi_thermal_zone_device_hot,
589 .critical = acpi_thermal_zone_device_critical,
590};
591
592static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz)
593{
594 struct device *tzdev = thermal_zone_device(tz->thermal_zone);
595 int ret;
596
597 ret = sysfs_create_link(&tz->device->dev.kobj,
598 &tzdev->kobj, "thermal_zone");
599 if (ret)
600 return ret;
601
602 ret = sysfs_create_link(&tzdev->kobj,
603 &tz->device->dev.kobj, "device");
604 if (ret)
605 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
606
607 return ret;
608}
609
610static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz)
611{
612 struct device *tzdev = thermal_zone_device(tz->thermal_zone);
613
614 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
615 sysfs_remove_link(&tzdev->kobj, "device");
616}
617
618static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz,
619 const struct thermal_trip *trip_table,
620 unsigned int trip_count,
621 int passive_delay)
622{
623 int result;
624
625 if (trip_count)
626 tz->thermal_zone = thermal_zone_device_register_with_trips(
627 "acpitz", trip_table, trip_count, tz,
628 &acpi_thermal_zone_ops, NULL, passive_delay,
629 tz->polling_frequency * 100);
630 else
631 tz->thermal_zone = thermal_tripless_zone_device_register(
632 "acpitz", tz, &acpi_thermal_zone_ops, NULL);
633
634 if (IS_ERR(tz->thermal_zone))
635 return PTR_ERR(tz->thermal_zone);
636
637 result = acpi_thermal_zone_sysfs_add(tz);
638 if (result)
639 goto unregister_tzd;
640
641 result = thermal_zone_device_enable(tz->thermal_zone);
642 if (result)
643 goto remove_links;
644
645 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
646 thermal_zone_device_id(tz->thermal_zone));
647
648 return 0;
649
650remove_links:
651 acpi_thermal_zone_sysfs_remove(tz);
652unregister_tzd:
653 thermal_zone_device_unregister(tz->thermal_zone);
654
655 return result;
656}
657
658static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
659{
660 thermal_zone_device_disable(tz->thermal_zone);
661 acpi_thermal_zone_sysfs_remove(tz);
662 thermal_zone_device_unregister(tz->thermal_zone);
663 tz->thermal_zone = NULL;
664}
665
666
667/* --------------------------------------------------------------------------
668 Driver Interface
669 -------------------------------------------------------------------------- */
670
671static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
672{
673 struct acpi_device *device = data;
674 struct acpi_thermal *tz = acpi_driver_data(device);
675
676 if (!tz)
677 return;
678
679 switch (event) {
680 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
681 acpi_queue_thermal_check(tz);
682 break;
683 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
684 case ACPI_THERMAL_NOTIFY_DEVICES:
685 acpi_thermal_trips_update(tz, event);
686 break;
687 default:
688 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
689 event);
690 break;
691 }
692}
693
694/*
695 * On some platforms, the AML code has dependency about
696 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
697 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
698 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
699 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
700 * if _TMP has never been evaluated.
701 *
702 * As this dependency is totally transparent to OS, evaluate
703 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
704 * _TMP, before they are actually used.
705 */
706static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
707{
708 acpi_handle handle = tz->device->handle;
709 unsigned long long value;
710 int i;
711
712 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
713 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
714 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
715 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
716 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
717 acpi_status status;
718
719 status = acpi_evaluate_integer(handle, name, NULL, &value);
720 if (status == AE_NOT_FOUND)
721 break;
722 }
723 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
724}
725
726/*
727 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
728 * handles temperature values with a single decimal place. As a consequence,
729 * some implementations use an offset of 273.1 and others use an offset of
730 * 273.2. Try to find out which one is being used, to present the most
731 * accurate and visually appealing number.
732 *
733 * The heuristic below should work for all ACPI thermal zones which have a
734 * critical trip point with a value being a multiple of 0.5 degree Celsius.
735 */
736static void acpi_thermal_guess_offset(struct acpi_thermal *tz, long crit_temp)
737{
738 if (crit_temp != THERMAL_TEMP_INVALID && crit_temp % 5 == 1)
739 tz->kelvin_offset = 273100;
740 else
741 tz->kelvin_offset = 273200;
742}
743
744static void acpi_thermal_check_fn(struct work_struct *work)
745{
746 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
747 thermal_check_work);
748
749 /*
750 * In general, it is not sufficient to check the pending bit, because
751 * subsequent instances of this function may be queued after one of them
752 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
753 * one of them is running, though, because it may have done the actual
754 * check some time ago, so allow at least one of them to block on the
755 * mutex while another one is running the update.
756 */
757 if (!refcount_dec_not_one(&tz->thermal_check_count))
758 return;
759
760 mutex_lock(&tz->thermal_check_lock);
761
762 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
763
764 refcount_inc(&tz->thermal_check_count);
765
766 mutex_unlock(&tz->thermal_check_lock);
767}
768
769static void acpi_thermal_free_thermal_zone(struct acpi_thermal *tz)
770{
771 int i;
772
773 acpi_handle_list_free(&tz->trips.passive.trip.devices);
774 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
775 acpi_handle_list_free(&tz->trips.active[i].trip.devices);
776
777 kfree(tz);
778}
779
780static int acpi_thermal_add(struct acpi_device *device)
781{
782 struct thermal_trip trip_table[ACPI_THERMAL_MAX_NR_TRIPS] = { 0 };
783 struct acpi_thermal_trip *acpi_trip;
784 struct thermal_trip *trip;
785 struct acpi_thermal *tz;
786 int crit_temp, hot_temp;
787 int passive_delay = 0;
788 int result;
789 int i;
790
791 if (!device)
792 return -EINVAL;
793
794 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
795 if (!tz)
796 return -ENOMEM;
797
798 tz->device = device;
799 strscpy(tz->name, device->pnp.bus_id);
800 strscpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
801 strscpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
802 device->driver_data = tz;
803
804 acpi_thermal_aml_dependency_fix(tz);
805
806 /* Get trip points [_CRT, _PSV, etc.] (required). */
807 acpi_thermal_get_trip_points(tz);
808
809 crit_temp = acpi_thermal_get_critical_trip(tz);
810 hot_temp = acpi_thermal_get_hot_trip(tz);
811
812 /* Get temperature [_TMP] (required). */
813 result = acpi_thermal_get_temperature(tz);
814 if (result)
815 goto free_memory;
816
817 /* Set the cooling mode [_SCP] to active cooling. */
818 acpi_execute_simple_method(tz->device->handle, "_SCP",
819 ACPI_THERMAL_MODE_ACTIVE);
820
821 /* Determine the default polling frequency [_TZP]. */
822 if (tzp)
823 tz->polling_frequency = tzp;
824 else
825 acpi_thermal_get_polling_frequency(tz);
826
827 acpi_thermal_guess_offset(tz, crit_temp);
828
829 trip = trip_table;
830
831 if (crit_temp != THERMAL_TEMP_INVALID) {
832 trip->type = THERMAL_TRIP_CRITICAL;
833 trip->temperature = acpi_thermal_temp(tz, crit_temp);
834 trip++;
835 }
836
837 if (hot_temp != THERMAL_TEMP_INVALID) {
838 trip->type = THERMAL_TRIP_HOT;
839 trip->temperature = acpi_thermal_temp(tz, hot_temp);
840 trip++;
841 }
842
843 acpi_trip = &tz->trips.passive.trip;
844 if (acpi_thermal_trip_valid(acpi_trip)) {
845 passive_delay = tz->trips.passive.delay;
846
847 trip->type = THERMAL_TRIP_PASSIVE;
848 trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
849 trip->priv = acpi_trip;
850 trip++;
851 }
852
853 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
854 acpi_trip = &tz->trips.active[i].trip;
855
856 if (!acpi_thermal_trip_valid(acpi_trip))
857 break;
858
859 trip->type = THERMAL_TRIP_ACTIVE;
860 trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
861 trip->priv = acpi_trip;
862 trip++;
863 }
864
865 if (trip == trip_table)
866 pr_warn(FW_BUG "No valid trip points!\n");
867
868 result = acpi_thermal_register_thermal_zone(tz, trip_table,
869 trip - trip_table,
870 passive_delay);
871 if (result)
872 goto free_memory;
873
874 refcount_set(&tz->thermal_check_count, 3);
875 mutex_init(&tz->thermal_check_lock);
876 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
877
878 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
879 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temp_dk));
880
881 result = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
882 acpi_thermal_notify, device);
883 if (result)
884 goto flush_wq;
885
886 return 0;
887
888flush_wq:
889 flush_workqueue(acpi_thermal_pm_queue);
890 acpi_thermal_unregister_thermal_zone(tz);
891free_memory:
892 acpi_thermal_free_thermal_zone(tz);
893
894 return result;
895}
896
897static void acpi_thermal_remove(struct acpi_device *device)
898{
899 struct acpi_thermal *tz;
900
901 if (!device || !acpi_driver_data(device))
902 return;
903
904 tz = acpi_driver_data(device);
905
906 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
907 acpi_thermal_notify);
908
909 flush_workqueue(acpi_thermal_pm_queue);
910 acpi_thermal_unregister_thermal_zone(tz);
911 acpi_thermal_free_thermal_zone(tz);
912}
913
914#ifdef CONFIG_PM_SLEEP
915static int acpi_thermal_suspend(struct device *dev)
916{
917 /* Make sure the previously queued thermal check work has been done */
918 flush_workqueue(acpi_thermal_pm_queue);
919 return 0;
920}
921
922static int acpi_thermal_resume(struct device *dev)
923{
924 struct acpi_thermal *tz;
925 int i, j, power_state;
926
927 if (!dev)
928 return -EINVAL;
929
930 tz = acpi_driver_data(to_acpi_device(dev));
931 if (!tz)
932 return -EINVAL;
933
934 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
935 struct acpi_thermal_trip *acpi_trip = &tz->trips.active[i].trip;
936
937 if (!acpi_thermal_trip_valid(acpi_trip))
938 break;
939
940 for (j = 0; j < acpi_trip->devices.count; j++) {
941 acpi_bus_update_power(acpi_trip->devices.handles[j],
942 &power_state);
943 }
944 }
945
946 acpi_queue_thermal_check(tz);
947
948 return AE_OK;
949}
950#else
951#define acpi_thermal_suspend NULL
952#define acpi_thermal_resume NULL
953#endif
954static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
955
956static const struct acpi_device_id thermal_device_ids[] = {
957 {ACPI_THERMAL_HID, 0},
958 {"", 0},
959};
960MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
961
962static struct acpi_driver acpi_thermal_driver = {
963 .name = "thermal",
964 .class = ACPI_THERMAL_CLASS,
965 .ids = thermal_device_ids,
966 .ops = {
967 .add = acpi_thermal_add,
968 .remove = acpi_thermal_remove,
969 },
970 .drv.pm = &acpi_thermal_pm,
971};
972
973static int thermal_act(const struct dmi_system_id *d)
974{
975 if (act == 0) {
976 pr_notice("%s detected: disabling all active thermal trip points\n",
977 d->ident);
978 act = -1;
979 }
980 return 0;
981}
982
983static int thermal_nocrt(const struct dmi_system_id *d)
984{
985 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
986 d->ident);
987 crt = -1;
988 return 0;
989}
990
991static int thermal_tzp(const struct dmi_system_id *d)
992{
993 if (tzp == 0) {
994 pr_notice("%s detected: enabling thermal zone polling\n",
995 d->ident);
996 tzp = 300; /* 300 dS = 30 Seconds */
997 }
998 return 0;
999}
1000
1001static int thermal_psv(const struct dmi_system_id *d)
1002{
1003 if (psv == 0) {
1004 pr_notice("%s detected: disabling all passive thermal trip points\n",
1005 d->ident);
1006 psv = -1;
1007 }
1008 return 0;
1009}
1010
1011static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1012 /*
1013 * Award BIOS on this AOpen makes thermal control almost worthless.
1014 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1015 */
1016 {
1017 .callback = thermal_act,
1018 .ident = "AOpen i915GMm-HFS",
1019 .matches = {
1020 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1021 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1022 },
1023 },
1024 {
1025 .callback = thermal_psv,
1026 .ident = "AOpen i915GMm-HFS",
1027 .matches = {
1028 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1029 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1030 },
1031 },
1032 {
1033 .callback = thermal_tzp,
1034 .ident = "AOpen i915GMm-HFS",
1035 .matches = {
1036 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1037 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1038 },
1039 },
1040 {
1041 .callback = thermal_nocrt,
1042 .ident = "Gigabyte GA-7ZX",
1043 .matches = {
1044 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1045 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1046 },
1047 },
1048 {}
1049};
1050
1051static int __init acpi_thermal_init(void)
1052{
1053 int result;
1054
1055 dmi_check_system(thermal_dmi_table);
1056
1057 if (off) {
1058 pr_notice("thermal control disabled\n");
1059 return -ENODEV;
1060 }
1061
1062 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1063 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1064 if (!acpi_thermal_pm_queue)
1065 return -ENODEV;
1066
1067 result = acpi_bus_register_driver(&acpi_thermal_driver);
1068 if (result < 0) {
1069 destroy_workqueue(acpi_thermal_pm_queue);
1070 return -ENODEV;
1071 }
1072
1073 return 0;
1074}
1075
1076static void __exit acpi_thermal_exit(void)
1077{
1078 acpi_bus_unregister_driver(&acpi_thermal_driver);
1079 destroy_workqueue(acpi_thermal_pm_queue);
1080}
1081
1082module_init(acpi_thermal_init);
1083module_exit(acpi_thermal_exit);
1084
1085MODULE_IMPORT_NS("ACPI_THERMAL");
1086MODULE_AUTHOR("Paul Diefenbaugh");
1087MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
1088MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 *
8 * This driver fully implements the ACPI thermal policy as described in the
9 * ACPI 2.0 Specification.
10 *
11 * TBD: 1. Implement passive cooling hysteresis.
12 * 2. Enhance passive cooling (CPU) states/limit interface to support
13 * concepts of 'multiple limiters', upper/lower limits, etc.
14 */
15
16#define pr_fmt(fmt) "ACPI: thermal: " fmt
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/dmi.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <linux/types.h>
24#include <linux/jiffies.h>
25#include <linux/kmod.h>
26#include <linux/reboot.h>
27#include <linux/device.h>
28#include <linux/thermal.h>
29#include <linux/acpi.h>
30#include <linux/workqueue.h>
31#include <linux/uaccess.h>
32#include <linux/units.h>
33
34#include "internal.h"
35
36#define ACPI_THERMAL_CLASS "thermal_zone"
37#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
38#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
39#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
40#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
41#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
42#define ACPI_THERMAL_NOTIFY_HOT 0xF1
43#define ACPI_THERMAL_MODE_ACTIVE 0x00
44
45#define ACPI_THERMAL_MAX_ACTIVE 10
46#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
47
48#define ACPI_THERMAL_TRIP_PASSIVE (-1)
49
50/*
51 * This exception is thrown out in two cases:
52 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
53 * when re-evaluating the AML code.
54 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
55 * We need to re-bind the cooling devices of a thermal zone when this occurs.
56 */
57#define ACPI_THERMAL_TRIPS_EXCEPTION(tz, str) \
58do { \
59 acpi_handle_info(tz->device->handle, \
60 "ACPI thermal trip point %s changed\n" \
61 "Please report to linux-acpi@vger.kernel.org\n", str); \
62} while (0)
63
64static int act;
65module_param(act, int, 0644);
66MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
67
68static int crt;
69module_param(crt, int, 0644);
70MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
71
72static int tzp;
73module_param(tzp, int, 0444);
74MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
75
76static int off;
77module_param(off, int, 0);
78MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
79
80static int psv;
81module_param(psv, int, 0644);
82MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
83
84static struct workqueue_struct *acpi_thermal_pm_queue;
85
86struct acpi_thermal_trip {
87 unsigned long temp_dk;
88 struct acpi_handle_list devices;
89};
90
91struct acpi_thermal_passive {
92 struct acpi_thermal_trip trip;
93 unsigned long tc1;
94 unsigned long tc2;
95 unsigned long delay;
96};
97
98struct acpi_thermal_active {
99 struct acpi_thermal_trip trip;
100};
101
102struct acpi_thermal_trips {
103 struct acpi_thermal_passive passive;
104 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
105};
106
107struct acpi_thermal {
108 struct acpi_device *device;
109 acpi_bus_id name;
110 unsigned long temp_dk;
111 unsigned long last_temp_dk;
112 unsigned long polling_frequency;
113 volatile u8 zombie;
114 struct acpi_thermal_trips trips;
115 struct thermal_trip *trip_table;
116 struct thermal_zone_device *thermal_zone;
117 int kelvin_offset; /* in millidegrees */
118 struct work_struct thermal_check_work;
119 struct mutex thermal_check_lock;
120 refcount_t thermal_check_count;
121};
122
123/* --------------------------------------------------------------------------
124 Thermal Zone Management
125 -------------------------------------------------------------------------- */
126
127static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
128{
129 acpi_status status = AE_OK;
130 unsigned long long tmp;
131
132 if (!tz)
133 return -EINVAL;
134
135 tz->last_temp_dk = tz->temp_dk;
136
137 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
138 if (ACPI_FAILURE(status))
139 return -ENODEV;
140
141 tz->temp_dk = tmp;
142
143 acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n",
144 tz->temp_dk);
145
146 return 0;
147}
148
149static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
150{
151 acpi_status status = AE_OK;
152 unsigned long long tmp;
153
154 if (!tz)
155 return -EINVAL;
156
157 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
158 if (ACPI_FAILURE(status))
159 return -ENODEV;
160
161 tz->polling_frequency = tmp;
162 acpi_handle_debug(tz->device->handle, "Polling frequency is %lu dS\n",
163 tz->polling_frequency);
164
165 return 0;
166}
167
168static int acpi_thermal_temp(struct acpi_thermal *tz, int temp_deci_k)
169{
170 if (temp_deci_k == THERMAL_TEMP_INVALID)
171 return THERMAL_TEMP_INVALID;
172
173 return deci_kelvin_to_millicelsius_with_offset(temp_deci_k,
174 tz->kelvin_offset);
175}
176
177static bool acpi_thermal_trip_valid(struct acpi_thermal_trip *acpi_trip)
178{
179 return acpi_trip->temp_dk != THERMAL_TEMP_INVALID;
180}
181
182static int active_trip_index(struct acpi_thermal *tz,
183 struct acpi_thermal_trip *acpi_trip)
184{
185 struct acpi_thermal_active *active;
186
187 active = container_of(acpi_trip, struct acpi_thermal_active, trip);
188 return active - tz->trips.active;
189}
190
191static long get_passive_temp(struct acpi_thermal *tz)
192{
193 int temp;
194
195 if (acpi_passive_trip_temp(tz->device, &temp))
196 return THERMAL_TEMP_INVALID;
197
198 return temp;
199}
200
201static long get_active_temp(struct acpi_thermal *tz, int index)
202{
203 int temp;
204
205 if (acpi_active_trip_temp(tz->device, index, &temp))
206 return THERMAL_TEMP_INVALID;
207
208 /*
209 * If an override has been provided, apply it so there are no active
210 * trips with thresholds greater than the override.
211 */
212 if (act > 0) {
213 unsigned long long override = celsius_to_deci_kelvin(act);
214
215 if (temp > override)
216 return override;
217 }
218 return temp;
219}
220
221static void acpi_thermal_update_trip(struct acpi_thermal *tz,
222 const struct thermal_trip *trip)
223{
224 struct acpi_thermal_trip *acpi_trip = trip->priv;
225
226 if (trip->type == THERMAL_TRIP_PASSIVE) {
227 if (psv > 0)
228 return;
229
230 acpi_trip->temp_dk = get_passive_temp(tz);
231 } else {
232 int index = active_trip_index(tz, acpi_trip);
233
234 acpi_trip->temp_dk = get_active_temp(tz, index);
235 }
236
237 if (!acpi_thermal_trip_valid(acpi_trip))
238 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
239}
240
241static bool update_trip_devices(struct acpi_thermal *tz,
242 struct acpi_thermal_trip *acpi_trip,
243 int index, bool compare)
244{
245 struct acpi_handle_list devices = { 0 };
246 char method[] = "_PSL";
247
248 if (index != ACPI_THERMAL_TRIP_PASSIVE) {
249 method[1] = 'A';
250 method[2] = 'L';
251 method[3] = '0' + index;
252 }
253
254 if (!acpi_evaluate_reference(tz->device->handle, method, NULL, &devices)) {
255 acpi_handle_info(tz->device->handle, "%s evaluation failure\n", method);
256 return false;
257 }
258
259 if (acpi_handle_list_equal(&acpi_trip->devices, &devices)) {
260 acpi_handle_list_free(&devices);
261 return true;
262 }
263
264 if (compare)
265 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "device");
266
267 acpi_handle_list_replace(&acpi_trip->devices, &devices);
268 return true;
269}
270
271static void acpi_thermal_update_trip_devices(struct acpi_thermal *tz,
272 const struct thermal_trip *trip)
273{
274 struct acpi_thermal_trip *acpi_trip = trip->priv;
275 int index = trip->type == THERMAL_TRIP_PASSIVE ?
276 ACPI_THERMAL_TRIP_PASSIVE : active_trip_index(tz, acpi_trip);
277
278 if (update_trip_devices(tz, acpi_trip, index, true))
279 return;
280
281 acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
282 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
283}
284
285struct adjust_trip_data {
286 struct acpi_thermal *tz;
287 u32 event;
288};
289
290static int acpi_thermal_adjust_trip(struct thermal_trip *trip, void *data)
291{
292 struct acpi_thermal_trip *acpi_trip = trip->priv;
293 struct adjust_trip_data *atd = data;
294 struct acpi_thermal *tz = atd->tz;
295 int temp;
296
297 if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
298 return 0;
299
300 if (atd->event == ACPI_THERMAL_NOTIFY_THRESHOLDS)
301 acpi_thermal_update_trip(tz, trip);
302 else
303 acpi_thermal_update_trip_devices(tz, trip);
304
305 if (acpi_thermal_trip_valid(acpi_trip))
306 temp = acpi_thermal_temp(tz, acpi_trip->temp_dk);
307 else
308 temp = THERMAL_TEMP_INVALID;
309
310 thermal_zone_set_trip_temp(tz->thermal_zone, trip, temp);
311
312 return 0;
313}
314
315static void acpi_queue_thermal_check(struct acpi_thermal *tz)
316{
317 if (!work_pending(&tz->thermal_check_work))
318 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
319}
320
321static void acpi_thermal_trips_update(struct acpi_thermal *tz, u32 event)
322{
323 struct adjust_trip_data atd = { .tz = tz, .event = event };
324 struct acpi_device *adev = tz->device;
325
326 /*
327 * Use thermal_zone_for_each_trip() to carry out the trip points
328 * update, so as to protect thermal_get_trend() from getting stale
329 * trip point temperatures and to prevent thermal_zone_device_update()
330 * invoked from acpi_thermal_check_fn() from producing inconsistent
331 * results.
332 */
333 thermal_zone_for_each_trip(tz->thermal_zone,
334 acpi_thermal_adjust_trip, &atd);
335 acpi_queue_thermal_check(tz);
336 acpi_bus_generate_netlink_event(adev->pnp.device_class,
337 dev_name(&adev->dev), event, 0);
338}
339
340static int acpi_thermal_get_critical_trip(struct acpi_thermal *tz)
341{
342 int temp;
343
344 if (crt > 0) {
345 temp = celsius_to_deci_kelvin(crt);
346 goto set;
347 }
348 if (crt == -1) {
349 acpi_handle_debug(tz->device->handle, "Critical threshold disabled\n");
350 return THERMAL_TEMP_INVALID;
351 }
352
353 if (acpi_critical_trip_temp(tz->device, &temp))
354 return THERMAL_TEMP_INVALID;
355
356 if (temp <= 2732) {
357 /*
358 * Below zero (Celsius) values clearly aren't right for sure,
359 * so discard them as invalid.
360 */
361 pr_info(FW_BUG "Invalid critical threshold (%d)\n", temp);
362 return THERMAL_TEMP_INVALID;
363 }
364
365set:
366 acpi_handle_debug(tz->device->handle, "Critical threshold [%d]\n", temp);
367 return temp;
368}
369
370static int acpi_thermal_get_hot_trip(struct acpi_thermal *tz)
371{
372 int temp;
373
374 if (acpi_hot_trip_temp(tz->device, &temp) || temp == THERMAL_TEMP_INVALID) {
375 acpi_handle_debug(tz->device->handle, "No hot threshold\n");
376 return THERMAL_TEMP_INVALID;
377 }
378
379 acpi_handle_debug(tz->device->handle, "Hot threshold [%d]\n", temp);
380 return temp;
381}
382
383static bool passive_trip_params_init(struct acpi_thermal *tz)
384{
385 unsigned long long tmp;
386 acpi_status status;
387
388 status = acpi_evaluate_integer(tz->device->handle, "_TC1", NULL, &tmp);
389 if (ACPI_FAILURE(status))
390 return false;
391
392 tz->trips.passive.tc1 = tmp;
393
394 status = acpi_evaluate_integer(tz->device->handle, "_TC2", NULL, &tmp);
395 if (ACPI_FAILURE(status))
396 return false;
397
398 tz->trips.passive.tc2 = tmp;
399
400 status = acpi_evaluate_integer(tz->device->handle, "_TFP", NULL, &tmp);
401 if (ACPI_SUCCESS(status)) {
402 tz->trips.passive.delay = tmp;
403 return true;
404 }
405
406 status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp);
407 if (ACPI_FAILURE(status))
408 return false;
409
410 tz->trips.passive.delay = tmp * 100;
411
412 return true;
413}
414
415static bool acpi_thermal_init_trip(struct acpi_thermal *tz, int index)
416{
417 struct acpi_thermal_trip *acpi_trip;
418 long temp;
419
420 if (index == ACPI_THERMAL_TRIP_PASSIVE) {
421 acpi_trip = &tz->trips.passive.trip;
422
423 if (psv == -1)
424 goto fail;
425
426 if (!passive_trip_params_init(tz))
427 goto fail;
428
429 temp = psv > 0 ? celsius_to_deci_kelvin(psv) :
430 get_passive_temp(tz);
431 } else {
432 acpi_trip = &tz->trips.active[index].trip;
433
434 if (act == -1)
435 goto fail;
436
437 temp = get_active_temp(tz, index);
438 }
439
440 if (temp == THERMAL_TEMP_INVALID)
441 goto fail;
442
443 if (!update_trip_devices(tz, acpi_trip, index, false))
444 goto fail;
445
446 acpi_trip->temp_dk = temp;
447 return true;
448
449fail:
450 acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
451 return false;
452}
453
454static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
455{
456 unsigned int count = 0;
457 int i;
458
459 if (acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE))
460 count++;
461
462 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
463 if (acpi_thermal_init_trip(tz, i))
464 count++;
465 else
466 break;
467
468 }
469
470 while (++i < ACPI_THERMAL_MAX_ACTIVE)
471 tz->trips.active[i].trip.temp_dk = THERMAL_TEMP_INVALID;
472
473 return count;
474}
475
476/* sys I/F for generic thermal sysfs support */
477
478static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
479{
480 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
481 int result;
482
483 if (!tz)
484 return -EINVAL;
485
486 result = acpi_thermal_get_temperature(tz);
487 if (result)
488 return result;
489
490 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temp_dk,
491 tz->kelvin_offset);
492 return 0;
493}
494
495static int thermal_get_trend(struct thermal_zone_device *thermal,
496 const struct thermal_trip *trip,
497 enum thermal_trend *trend)
498{
499 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
500 struct acpi_thermal_trip *acpi_trip;
501 int t;
502
503 if (!tz || !trip)
504 return -EINVAL;
505
506 acpi_trip = trip->priv;
507 if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
508 return -EINVAL;
509
510 switch (trip->type) {
511 case THERMAL_TRIP_PASSIVE:
512 t = tz->trips.passive.tc1 * (tz->temp_dk -
513 tz->last_temp_dk) +
514 tz->trips.passive.tc2 * (tz->temp_dk -
515 acpi_trip->temp_dk);
516 if (t > 0)
517 *trend = THERMAL_TREND_RAISING;
518 else if (t < 0)
519 *trend = THERMAL_TREND_DROPPING;
520 else
521 *trend = THERMAL_TREND_STABLE;
522
523 return 0;
524
525 case THERMAL_TRIP_ACTIVE:
526 t = acpi_thermal_temp(tz, tz->temp_dk);
527 if (t <= trip->temperature)
528 break;
529
530 *trend = THERMAL_TREND_RAISING;
531
532 return 0;
533
534 default:
535 break;
536 }
537
538 return -EINVAL;
539}
540
541static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
542{
543 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
544
545 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
546 dev_name(&tz->device->dev),
547 ACPI_THERMAL_NOTIFY_HOT, 1);
548}
549
550static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
551{
552 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
553
554 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
555 dev_name(&tz->device->dev),
556 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
557
558 thermal_zone_device_critical(thermal);
559}
560
561struct acpi_thermal_bind_data {
562 struct thermal_zone_device *thermal;
563 struct thermal_cooling_device *cdev;
564 bool bind;
565};
566
567static int bind_unbind_cdev_cb(struct thermal_trip *trip, void *arg)
568{
569 struct acpi_thermal_trip *acpi_trip = trip->priv;
570 struct acpi_thermal_bind_data *bd = arg;
571 struct thermal_zone_device *thermal = bd->thermal;
572 struct thermal_cooling_device *cdev = bd->cdev;
573 struct acpi_device *cdev_adev = cdev->devdata;
574 int i;
575
576 /* Skip critical and hot trips. */
577 if (!acpi_trip)
578 return 0;
579
580 for (i = 0; i < acpi_trip->devices.count; i++) {
581 acpi_handle handle = acpi_trip->devices.handles[i];
582 struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
583
584 if (adev != cdev_adev)
585 continue;
586
587 if (bd->bind) {
588 int ret;
589
590 ret = thermal_bind_cdev_to_trip(thermal, trip, cdev,
591 THERMAL_NO_LIMIT,
592 THERMAL_NO_LIMIT,
593 THERMAL_WEIGHT_DEFAULT);
594 if (ret)
595 return ret;
596 } else {
597 thermal_unbind_cdev_from_trip(thermal, trip, cdev);
598 }
599 }
600
601 return 0;
602}
603
604static int acpi_thermal_bind_unbind_cdev(struct thermal_zone_device *thermal,
605 struct thermal_cooling_device *cdev,
606 bool bind)
607{
608 struct acpi_thermal_bind_data bd = {
609 .thermal = thermal, .cdev = cdev, .bind = bind
610 };
611
612 return for_each_thermal_trip(thermal, bind_unbind_cdev_cb, &bd);
613}
614
615static int
616acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
617 struct thermal_cooling_device *cdev)
618{
619 return acpi_thermal_bind_unbind_cdev(thermal, cdev, true);
620}
621
622static int
623acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
624 struct thermal_cooling_device *cdev)
625{
626 return acpi_thermal_bind_unbind_cdev(thermal, cdev, false);
627}
628
629static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
630 .bind = acpi_thermal_bind_cooling_device,
631 .unbind = acpi_thermal_unbind_cooling_device,
632 .get_temp = thermal_get_temp,
633 .get_trend = thermal_get_trend,
634 .hot = acpi_thermal_zone_device_hot,
635 .critical = acpi_thermal_zone_device_critical,
636};
637
638static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz)
639{
640 struct device *tzdev = thermal_zone_device(tz->thermal_zone);
641 int ret;
642
643 ret = sysfs_create_link(&tz->device->dev.kobj,
644 &tzdev->kobj, "thermal_zone");
645 if (ret)
646 return ret;
647
648 ret = sysfs_create_link(&tzdev->kobj,
649 &tz->device->dev.kobj, "device");
650 if (ret)
651 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
652
653 return ret;
654}
655
656static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz)
657{
658 struct device *tzdev = thermal_zone_device(tz->thermal_zone);
659
660 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
661 sysfs_remove_link(&tzdev->kobj, "device");
662}
663
664static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz,
665 unsigned int trip_count,
666 int passive_delay)
667{
668 int result;
669
670 tz->thermal_zone = thermal_zone_device_register_with_trips("acpitz",
671 tz->trip_table,
672 trip_count,
673 0, tz,
674 &acpi_thermal_zone_ops,
675 NULL,
676 passive_delay,
677 tz->polling_frequency * 100);
678 if (IS_ERR(tz->thermal_zone))
679 return PTR_ERR(tz->thermal_zone);
680
681 result = acpi_thermal_zone_sysfs_add(tz);
682 if (result)
683 goto unregister_tzd;
684
685 result = thermal_zone_device_enable(tz->thermal_zone);
686 if (result)
687 goto remove_links;
688
689 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
690 thermal_zone_device_id(tz->thermal_zone));
691
692 return 0;
693
694remove_links:
695 acpi_thermal_zone_sysfs_remove(tz);
696unregister_tzd:
697 thermal_zone_device_unregister(tz->thermal_zone);
698
699 return result;
700}
701
702static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
703{
704 thermal_zone_device_disable(tz->thermal_zone);
705 acpi_thermal_zone_sysfs_remove(tz);
706 thermal_zone_device_unregister(tz->thermal_zone);
707 tz->thermal_zone = NULL;
708}
709
710
711/* --------------------------------------------------------------------------
712 Driver Interface
713 -------------------------------------------------------------------------- */
714
715static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
716{
717 struct acpi_device *device = data;
718 struct acpi_thermal *tz = acpi_driver_data(device);
719
720 if (!tz)
721 return;
722
723 switch (event) {
724 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
725 acpi_queue_thermal_check(tz);
726 break;
727 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
728 case ACPI_THERMAL_NOTIFY_DEVICES:
729 acpi_thermal_trips_update(tz, event);
730 break;
731 default:
732 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
733 event);
734 break;
735 }
736}
737
738/*
739 * On some platforms, the AML code has dependency about
740 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
741 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
742 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
743 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
744 * if _TMP has never been evaluated.
745 *
746 * As this dependency is totally transparent to OS, evaluate
747 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
748 * _TMP, before they are actually used.
749 */
750static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
751{
752 acpi_handle handle = tz->device->handle;
753 unsigned long long value;
754 int i;
755
756 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
757 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
758 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
759 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
760 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
761 acpi_status status;
762
763 status = acpi_evaluate_integer(handle, name, NULL, &value);
764 if (status == AE_NOT_FOUND)
765 break;
766 }
767 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
768}
769
770/*
771 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
772 * handles temperature values with a single decimal place. As a consequence,
773 * some implementations use an offset of 273.1 and others use an offset of
774 * 273.2. Try to find out which one is being used, to present the most
775 * accurate and visually appealing number.
776 *
777 * The heuristic below should work for all ACPI thermal zones which have a
778 * critical trip point with a value being a multiple of 0.5 degree Celsius.
779 */
780static void acpi_thermal_guess_offset(struct acpi_thermal *tz, long crit_temp)
781{
782 if (crit_temp != THERMAL_TEMP_INVALID && crit_temp % 5 == 1)
783 tz->kelvin_offset = 273100;
784 else
785 tz->kelvin_offset = 273200;
786}
787
788static void acpi_thermal_check_fn(struct work_struct *work)
789{
790 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
791 thermal_check_work);
792
793 /*
794 * In general, it is not sufficient to check the pending bit, because
795 * subsequent instances of this function may be queued after one of them
796 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
797 * one of them is running, though, because it may have done the actual
798 * check some time ago, so allow at least one of them to block on the
799 * mutex while another one is running the update.
800 */
801 if (!refcount_dec_not_one(&tz->thermal_check_count))
802 return;
803
804 mutex_lock(&tz->thermal_check_lock);
805
806 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
807
808 refcount_inc(&tz->thermal_check_count);
809
810 mutex_unlock(&tz->thermal_check_lock);
811}
812
813static void acpi_thermal_free_thermal_zone(struct acpi_thermal *tz)
814{
815 int i;
816
817 acpi_handle_list_free(&tz->trips.passive.trip.devices);
818 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
819 acpi_handle_list_free(&tz->trips.active[i].trip.devices);
820
821 kfree(tz);
822}
823
824static int acpi_thermal_add(struct acpi_device *device)
825{
826 struct acpi_thermal_trip *acpi_trip;
827 struct thermal_trip *trip;
828 struct acpi_thermal *tz;
829 unsigned int trip_count;
830 int crit_temp, hot_temp;
831 int passive_delay = 0;
832 int result;
833 int i;
834
835 if (!device)
836 return -EINVAL;
837
838 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
839 if (!tz)
840 return -ENOMEM;
841
842 tz->device = device;
843 strcpy(tz->name, device->pnp.bus_id);
844 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
845 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
846 device->driver_data = tz;
847
848 acpi_thermal_aml_dependency_fix(tz);
849
850 /* Get trip points [_CRT, _PSV, etc.] (required). */
851 trip_count = acpi_thermal_get_trip_points(tz);
852
853 crit_temp = acpi_thermal_get_critical_trip(tz);
854 if (crit_temp != THERMAL_TEMP_INVALID)
855 trip_count++;
856
857 hot_temp = acpi_thermal_get_hot_trip(tz);
858 if (hot_temp != THERMAL_TEMP_INVALID)
859 trip_count++;
860
861 if (!trip_count) {
862 pr_warn(FW_BUG "No valid trip points!\n");
863 result = -ENODEV;
864 goto free_memory;
865 }
866
867 /* Get temperature [_TMP] (required). */
868 result = acpi_thermal_get_temperature(tz);
869 if (result)
870 goto free_memory;
871
872 /* Set the cooling mode [_SCP] to active cooling. */
873 acpi_execute_simple_method(tz->device->handle, "_SCP",
874 ACPI_THERMAL_MODE_ACTIVE);
875
876 /* Determine the default polling frequency [_TZP]. */
877 if (tzp)
878 tz->polling_frequency = tzp;
879 else
880 acpi_thermal_get_polling_frequency(tz);
881
882 acpi_thermal_guess_offset(tz, crit_temp);
883
884 trip = kcalloc(trip_count, sizeof(*trip), GFP_KERNEL);
885 if (!trip) {
886 result = -ENOMEM;
887 goto free_memory;
888 }
889
890 tz->trip_table = trip;
891
892 if (crit_temp != THERMAL_TEMP_INVALID) {
893 trip->type = THERMAL_TRIP_CRITICAL;
894 trip->temperature = acpi_thermal_temp(tz, crit_temp);
895 trip++;
896 }
897
898 if (hot_temp != THERMAL_TEMP_INVALID) {
899 trip->type = THERMAL_TRIP_HOT;
900 trip->temperature = acpi_thermal_temp(tz, hot_temp);
901 trip++;
902 }
903
904 acpi_trip = &tz->trips.passive.trip;
905 if (acpi_thermal_trip_valid(acpi_trip)) {
906 passive_delay = tz->trips.passive.delay;
907
908 trip->type = THERMAL_TRIP_PASSIVE;
909 trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
910 trip->priv = acpi_trip;
911 trip++;
912 }
913
914 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
915 acpi_trip = &tz->trips.active[i].trip;
916
917 if (!acpi_thermal_trip_valid(acpi_trip))
918 break;
919
920 trip->type = THERMAL_TRIP_ACTIVE;
921 trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
922 trip->priv = acpi_trip;
923 trip++;
924 }
925
926 result = acpi_thermal_register_thermal_zone(tz, trip_count, passive_delay);
927 if (result)
928 goto free_trips;
929
930 refcount_set(&tz->thermal_check_count, 3);
931 mutex_init(&tz->thermal_check_lock);
932 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
933
934 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
935 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temp_dk));
936
937 result = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
938 acpi_thermal_notify, device);
939 if (result)
940 goto flush_wq;
941
942 return 0;
943
944flush_wq:
945 flush_workqueue(acpi_thermal_pm_queue);
946 acpi_thermal_unregister_thermal_zone(tz);
947free_trips:
948 kfree(tz->trip_table);
949free_memory:
950 acpi_thermal_free_thermal_zone(tz);
951
952 return result;
953}
954
955static void acpi_thermal_remove(struct acpi_device *device)
956{
957 struct acpi_thermal *tz;
958
959 if (!device || !acpi_driver_data(device))
960 return;
961
962 tz = acpi_driver_data(device);
963
964 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
965 acpi_thermal_notify);
966
967 flush_workqueue(acpi_thermal_pm_queue);
968 acpi_thermal_unregister_thermal_zone(tz);
969 kfree(tz->trip_table);
970 acpi_thermal_free_thermal_zone(tz);
971}
972
973#ifdef CONFIG_PM_SLEEP
974static int acpi_thermal_suspend(struct device *dev)
975{
976 /* Make sure the previously queued thermal check work has been done */
977 flush_workqueue(acpi_thermal_pm_queue);
978 return 0;
979}
980
981static int acpi_thermal_resume(struct device *dev)
982{
983 struct acpi_thermal *tz;
984 int i, j, power_state;
985
986 if (!dev)
987 return -EINVAL;
988
989 tz = acpi_driver_data(to_acpi_device(dev));
990 if (!tz)
991 return -EINVAL;
992
993 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
994 struct acpi_thermal_trip *acpi_trip = &tz->trips.active[i].trip;
995
996 if (!acpi_thermal_trip_valid(acpi_trip))
997 break;
998
999 for (j = 0; j < acpi_trip->devices.count; j++) {
1000 acpi_bus_update_power(acpi_trip->devices.handles[j],
1001 &power_state);
1002 }
1003 }
1004
1005 acpi_queue_thermal_check(tz);
1006
1007 return AE_OK;
1008}
1009#else
1010#define acpi_thermal_suspend NULL
1011#define acpi_thermal_resume NULL
1012#endif
1013static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
1014
1015static const struct acpi_device_id thermal_device_ids[] = {
1016 {ACPI_THERMAL_HID, 0},
1017 {"", 0},
1018};
1019MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
1020
1021static struct acpi_driver acpi_thermal_driver = {
1022 .name = "thermal",
1023 .class = ACPI_THERMAL_CLASS,
1024 .ids = thermal_device_ids,
1025 .ops = {
1026 .add = acpi_thermal_add,
1027 .remove = acpi_thermal_remove,
1028 },
1029 .drv.pm = &acpi_thermal_pm,
1030};
1031
1032static int thermal_act(const struct dmi_system_id *d)
1033{
1034 if (act == 0) {
1035 pr_notice("%s detected: disabling all active thermal trip points\n",
1036 d->ident);
1037 act = -1;
1038 }
1039 return 0;
1040}
1041
1042static int thermal_nocrt(const struct dmi_system_id *d)
1043{
1044 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
1045 d->ident);
1046 crt = -1;
1047 return 0;
1048}
1049
1050static int thermal_tzp(const struct dmi_system_id *d)
1051{
1052 if (tzp == 0) {
1053 pr_notice("%s detected: enabling thermal zone polling\n",
1054 d->ident);
1055 tzp = 300; /* 300 dS = 30 Seconds */
1056 }
1057 return 0;
1058}
1059
1060static int thermal_psv(const struct dmi_system_id *d)
1061{
1062 if (psv == 0) {
1063 pr_notice("%s detected: disabling all passive thermal trip points\n",
1064 d->ident);
1065 psv = -1;
1066 }
1067 return 0;
1068}
1069
1070static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1071 /*
1072 * Award BIOS on this AOpen makes thermal control almost worthless.
1073 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1074 */
1075 {
1076 .callback = thermal_act,
1077 .ident = "AOpen i915GMm-HFS",
1078 .matches = {
1079 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1080 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1081 },
1082 },
1083 {
1084 .callback = thermal_psv,
1085 .ident = "AOpen i915GMm-HFS",
1086 .matches = {
1087 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1088 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1089 },
1090 },
1091 {
1092 .callback = thermal_tzp,
1093 .ident = "AOpen i915GMm-HFS",
1094 .matches = {
1095 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1096 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1097 },
1098 },
1099 {
1100 .callback = thermal_nocrt,
1101 .ident = "Gigabyte GA-7ZX",
1102 .matches = {
1103 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1104 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1105 },
1106 },
1107 {}
1108};
1109
1110static int __init acpi_thermal_init(void)
1111{
1112 int result;
1113
1114 dmi_check_system(thermal_dmi_table);
1115
1116 if (off) {
1117 pr_notice("thermal control disabled\n");
1118 return -ENODEV;
1119 }
1120
1121 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1122 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1123 if (!acpi_thermal_pm_queue)
1124 return -ENODEV;
1125
1126 result = acpi_bus_register_driver(&acpi_thermal_driver);
1127 if (result < 0) {
1128 destroy_workqueue(acpi_thermal_pm_queue);
1129 return -ENODEV;
1130 }
1131
1132 return 0;
1133}
1134
1135static void __exit acpi_thermal_exit(void)
1136{
1137 acpi_bus_unregister_driver(&acpi_thermal_driver);
1138 destroy_workqueue(acpi_thermal_pm_queue);
1139}
1140
1141module_init(acpi_thermal_init);
1142module_exit(acpi_thermal_exit);
1143
1144MODULE_IMPORT_NS(ACPI_THERMAL);
1145MODULE_AUTHOR("Paul Diefenbaugh");
1146MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
1147MODULE_LICENSE("GPL");