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