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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 <[email protected]>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
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/platform_device.h>
29#include <linux/thermal.h>
30#include <linux/acpi.h>
31#include <linux/workqueue.h>
32#include <linux/uaccess.h>
33#include <linux/units.h>
34
35#include "internal.h"
36
37#define ACPI_THERMAL_CLASS "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 [email protected]\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(ACPI_THERMAL_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(ACPI_THERMAL_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(ACPI_THERMAL_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_zone_unregister(void *data)
659{
660 struct acpi_thermal *tz = data;
661
662 flush_workqueue(acpi_thermal_pm_queue);
663
664 thermal_zone_device_disable(tz->thermal_zone);
665 acpi_thermal_zone_sysfs_remove(tz);
666 thermal_zone_device_unregister(tz->thermal_zone);
667 tz->thermal_zone = NULL;
668}
669
670
671/* --------------------------------------------------------------------------
672 Driver Interface
673 -------------------------------------------------------------------------- */
674
675static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
676{
677 struct acpi_thermal *tz = data;
678
679 if (!tz)
680 return;
681
682 switch (event) {
683 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
684 acpi_queue_thermal_check(tz);
685 break;
686 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
687 case ACPI_THERMAL_NOTIFY_DEVICES:
688 acpi_thermal_trips_update(tz, event);
689 break;
690 default:
691 acpi_handle_debug(tz->device->handle,
692 "Unsupported event [0x%x]\n", event);
693 break;
694 }
695}
696
697/*
698 * On some platforms, the AML code has dependency about
699 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
700 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
701 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
702 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
703 * if _TMP has never been evaluated.
704 *
705 * As this dependency is totally transparent to OS, evaluate
706 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
707 * _TMP, before they are actually used.
708 */
709static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
710{
711 acpi_handle handle = tz->device->handle;
712 unsigned long long value;
713 int i;
714
715 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
716 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
717 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
718 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
719 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
720 acpi_status status;
721
722 status = acpi_evaluate_integer(handle, name, NULL, &value);
723 if (status == AE_NOT_FOUND)
724 break;
725 }
726 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
727}
728
729/*
730 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
731 * handles temperature values with a single decimal place. As a consequence,
732 * some implementations use an offset of 273.1 and others use an offset of
733 * 273.2. Try to find out which one is being used, to present the most
734 * accurate and visually appealing number.
735 *
736 * The heuristic below should work for all ACPI thermal zones which have a
737 * critical trip point with a value being a multiple of 0.5 degree Celsius.
738 */
739static void acpi_thermal_guess_offset(struct acpi_thermal *tz, long crit_temp)
740{
741 if (crit_temp != THERMAL_TEMP_INVALID && crit_temp % 5 == 1)
742 tz->kelvin_offset = 273100;
743 else
744 tz->kelvin_offset = 273200;
745}
746
747static void acpi_thermal_check_fn(struct work_struct *work)
748{
749 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
750 thermal_check_work);
751
752 /*
753 * In general, it is not sufficient to check the pending bit, because
754 * subsequent instances of this function may be queued after one of them
755 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
756 * one of them is running, though, because it may have done the actual
757 * check some time ago, so allow at least one of them to block on the
758 * mutex while another one is running the update.
759 */
760 if (!refcount_dec_not_one(&tz->thermal_check_count))
761 return;
762
763 mutex_lock(&tz->thermal_check_lock);
764
765 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
766
767 refcount_inc(&tz->thermal_check_count);
768
769 mutex_unlock(&tz->thermal_check_lock);
770}
771
772static void acpi_thermal_zone_free(void *data)
773{
774 struct acpi_thermal *tz = data;
775 int i;
776
777 acpi_handle_list_free(&tz->trips.passive.trip.devices);
778 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
779 acpi_handle_list_free(&tz->trips.active[i].trip.devices);
780
781 kfree(tz);
782}
783
784static int acpi_thermal_probe(struct platform_device *pdev)
785{
786 struct thermal_trip trip_table[ACPI_THERMAL_MAX_NR_TRIPS] = { 0 };
787 struct device *dev = &pdev->dev;
788 struct acpi_device *device = ACPI_COMPANION(dev);
789 struct acpi_thermal_trip *acpi_trip;
790 struct thermal_trip *trip;
791 struct acpi_thermal *tz;
792 int crit_temp, hot_temp;
793 int passive_delay = 0;
794 int result;
795 int i;
796
797 if (!device)
798 return -ENODEV;
799
800 tz = kzalloc_obj(struct acpi_thermal);
801 if (!tz)
802 return -ENOMEM;
803
804 result = devm_add_action_or_reset(dev, acpi_thermal_zone_free, tz);
805 if (result)
806 return result;
807
808 platform_set_drvdata(pdev, tz);
809
810 tz->device = device;
811 strscpy(tz->name, device->pnp.bus_id);
812
813 acpi_thermal_aml_dependency_fix(tz);
814
815 /*
816 * Set the cooling mode [_SCP] to active cooling. This needs to happen before
817 * we retrieve the trip point values.
818 */
819 acpi_execute_simple_method(tz->device->handle, "_SCP", ACPI_THERMAL_MODE_ACTIVE);
820
821 /* Get trip points [_ACi, _PSV, etc.] (required). */
822 acpi_thermal_get_trip_points(tz);
823
824 crit_temp = acpi_thermal_get_critical_trip(tz);
825 hot_temp = acpi_thermal_get_hot_trip(tz);
826
827 /* Get temperature [_TMP] (required). */
828 result = acpi_thermal_get_temperature(tz);
829 if (result)
830 return result;
831
832 /* Determine the default polling frequency [_TZP]. */
833 if (tzp)
834 tz->polling_frequency = tzp;
835 else
836 acpi_thermal_get_polling_frequency(tz);
837
838 acpi_thermal_guess_offset(tz, crit_temp);
839
840 trip = trip_table;
841
842 if (crit_temp != THERMAL_TEMP_INVALID) {
843 trip->type = THERMAL_TRIP_CRITICAL;
844 trip->temperature = acpi_thermal_temp(tz, crit_temp);
845 trip++;
846 }
847
848 if (hot_temp != THERMAL_TEMP_INVALID) {
849 trip->type = THERMAL_TRIP_HOT;
850 trip->temperature = acpi_thermal_temp(tz, hot_temp);
851 trip++;
852 }
853
854 acpi_trip = &tz->trips.passive.trip;
855 if (acpi_thermal_trip_valid(acpi_trip)) {
856 passive_delay = tz->trips.passive.delay;
857
858 trip->type = THERMAL_TRIP_PASSIVE;
859 trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
860 trip->priv = acpi_trip;
861 trip++;
862 }
863
864 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
865 acpi_trip = &tz->trips.active[i].trip;
866
867 if (!acpi_thermal_trip_valid(acpi_trip))
868 break;
869
870 trip->type = THERMAL_TRIP_ACTIVE;
871 trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
872 trip->priv = acpi_trip;
873 trip++;
874 }
875
876 if (trip == trip_table)
877 pr_warn(FW_BUG "No valid trip points!\n");
878
879 result = acpi_thermal_register_thermal_zone(tz, trip_table,
880 trip - trip_table,
881 passive_delay);
882 if (result)
883 return result;
884
885 result = devm_add_action_or_reset(dev, acpi_thermal_zone_unregister, tz);
886 if (result)
887 return result;
888
889 refcount_set(&tz->thermal_check_count, 3);
890 mutex_init(&tz->thermal_check_lock);
891 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
892
893 pr_info("Thermal Zone [%s] (%ld C)\n", acpi_device_bid(device),
894 deci_kelvin_to_celsius(tz->temp_dk));
895
896 return devm_acpi_install_notify_handler(dev, ACPI_DEVICE_NOTIFY,
897 acpi_thermal_notify, tz);
898}
899
900#ifdef CONFIG_PM_SLEEP
901static int acpi_thermal_prepare(struct device *dev)
902{
903 /* Make sure the previously queued thermal check work has been done */
904 flush_workqueue(acpi_thermal_pm_queue);
905 return 0;
906}
907
908static void acpi_thermal_complete(struct device *dev)
909{
910 acpi_queue_thermal_check(dev_get_drvdata(dev));
911}
912
913static const struct dev_pm_ops acpi_thermal_pm_ops = {
914 .prepare = acpi_thermal_prepare,
915 .complete = acpi_thermal_complete,
916};
917#define ACPI_THERMAL_PM &acpi_thermal_pm_ops
918#else /* !CONFIG_PM_SLEEP */
919#define ACPI_THERMAL_PM NULL
920#endif /* CONFIG_PM_SLEEP */
921
922static const struct acpi_device_id thermal_device_ids[] = {
923 {ACPI_THERMAL_HID, 0},
924 {"", 0},
925};
926MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
927
928static struct platform_driver acpi_thermal_driver = {
929 .probe = acpi_thermal_probe,
930 .driver = {
931 .name = "acpi-thermal",
932 .acpi_match_table = thermal_device_ids,
933 .pm = ACPI_THERMAL_PM,
934 },
935};
936
937static int thermal_act(const struct dmi_system_id *d)
938{
939 if (act == 0) {
940 pr_notice("%s detected: disabling all active thermal trip points\n",
941 d->ident);
942 act = -1;
943 }
944 return 0;
945}
946
947static int thermal_nocrt(const struct dmi_system_id *d)
948{
949 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
950 d->ident);
951 crt = -1;
952 return 0;
953}
954
955static int thermal_tzp(const struct dmi_system_id *d)
956{
957 if (tzp == 0) {
958 pr_notice("%s detected: enabling thermal zone polling\n",
959 d->ident);
960 tzp = 300; /* 300 dS = 30 Seconds */
961 }
962 return 0;
963}
964
965static int thermal_psv(const struct dmi_system_id *d)
966{
967 if (psv == 0) {
968 pr_notice("%s detected: disabling all passive thermal trip points\n",
969 d->ident);
970 psv = -1;
971 }
972 return 0;
973}
974
975static const struct dmi_system_id thermal_dmi_table[] __initconst = {
976 /*
977 * Award BIOS on this AOpen makes thermal control almost worthless.
978 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
979 */
980 {
981 .callback = thermal_act,
982 .ident = "AOpen i915GMm-HFS",
983 .matches = {
984 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
985 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
986 },
987 },
988 {
989 .callback = thermal_psv,
990 .ident = "AOpen i915GMm-HFS",
991 .matches = {
992 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
993 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
994 },
995 },
996 {
997 .callback = thermal_tzp,
998 .ident = "AOpen i915GMm-HFS",
999 .matches = {
1000 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1001 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1002 },
1003 },
1004 {
1005 .callback = thermal_nocrt,
1006 .ident = "Gigabyte GA-7ZX",
1007 .matches = {
1008 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1009 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1010 },
1011 },
1012 {}
1013};
1014
1015static int __init acpi_thermal_init(void)
1016{
1017 int result;
1018
1019 dmi_check_system(thermal_dmi_table);
1020
1021 if (off) {
1022 pr_notice("thermal control disabled\n");
1023 return -ENODEV;
1024 }
1025
1026 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1027 WQ_HIGHPRI | WQ_MEM_RECLAIM | WQ_PERCPU,
1028 0);
1029 if (!acpi_thermal_pm_queue)
1030 return -ENODEV;
1031
1032 result = platform_driver_register(&acpi_thermal_driver);
1033 if (result < 0) {
1034 destroy_workqueue(acpi_thermal_pm_queue);
1035 return -ENODEV;
1036 }
1037
1038 return 0;
1039}
1040
1041static void __exit acpi_thermal_exit(void)
1042{
1043 platform_driver_unregister(&acpi_thermal_driver);
1044 destroy_workqueue(acpi_thermal_pm_queue);
1045}
1046
1047module_init(acpi_thermal_init);
1048module_exit(acpi_thermal_exit);
1049
1050MODULE_IMPORT_NS("ACPI_THERMAL");
1051MODULE_AUTHOR("Paul Diefenbaugh");
1052MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
1053MODULE_LICENSE("GPL");