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(handle: tz->device->handle, pathname: "_TMP", NULL, data: &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(handle: tz->device->handle, pathname: "_TZP", NULL, data: &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(t: temp_deci_k,
177 offset: 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(adev: tz->device, ret_temp: &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(adev: tz->device, id: index, ret_temp: &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(t: 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(handle: tz->device->handle, pathname: method, NULL, list: &devices)) {
262 acpi_handle_info(tz->device->handle, "%s evaluation failure\n", method);
263 return false;
264 }
265
266 if (acpi_handle_list_equal(list1: &acpi_trip->devices, list2: &devices)) {
267 acpi_handle_list_free(list: &devices);
268 return true;
269 }
270
271 if (compare)
272 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "device");
273
274 acpi_handle_list_replace(dst: &acpi_trip->devices, src: &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, compare: 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, temp_deci_k: acpi_trip->temp_dk);
314 else
315 temp = THERMAL_TEMP_INVALID;
316
317 thermal_zone_set_trip_temp(tz: 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(wq: acpi_thermal_pm_queue, work: &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: tz->thermal_zone,
341 cb: acpi_thermal_adjust_trip, data: &atd);
342 acpi_queue_thermal_check(tz);
343 acpi_bus_generate_netlink_event(adev->pnp.device_class,
344 dev_name(dev: &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(t: 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(adev: tz->device, ret_temp: &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(adev: tz->device, ret_temp: &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(handle: tz->device->handle, pathname: "_TC1", NULL, data: &tmp);
396 if (ACPI_FAILURE(status))
397 return false;
398
399 tz->trips.passive.tc1 = tmp;
400
401 status = acpi_evaluate_integer(handle: tz->device->handle, pathname: "_TC2", NULL, data: &tmp);
402 if (ACPI_FAILURE(status))
403 return false;
404
405 tz->trips.passive.tc2 = tmp;
406
407 status = acpi_evaluate_integer(handle: tz->device->handle, pathname: "_TFP", NULL, data: &tmp);
408 if (ACPI_SUCCESS(status)) {
409 tz->trips.passive.delay = tmp;
410 return true;
411 }
412
413 status = acpi_evaluate_integer(handle: tz->device->handle, pathname: "_TSP", NULL, data: &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(t: 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, compare: 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, index: 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(tzd: 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(t: tz->temp_dk,
491 offset: 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(tzd: 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, temp_deci_k: 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(tzd: thermal);
544
545 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
546 dev_name(dev: &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(tzd: thermal);
553
554 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
555 dev_name(dev: &tz->device->dev),
556 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
557
558 thermal_zone_device_critical(tz: 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(tzd: tz->thermal_zone);
595 int ret;
596
597 ret = sysfs_create_link(kobj: &tz->device->dev.kobj,
598 target: &tzdev->kobj, name: "thermal_zone");
599 if (ret)
600 return ret;
601
602 ret = sysfs_create_link(kobj: &tzdev->kobj,
603 target: &tz->device->dev.kobj, name: "device");
604 if (ret)
605 sysfs_remove_link(kobj: &tz->device->dev.kobj, name: "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(tzd: tz->thermal_zone);
613
614 sysfs_remove_link(kobj: &tz->device->dev.kobj, name: "thermal_zone");
615 sysfs_remove_link(kobj: &tzdev->kobj, name: "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 type: "acpitz", trips: trip_table, num_trips: trip_count, devdata: tz,
628 ops: &acpi_thermal_zone_ops, NULL, passive_delay,
629 polling_delay: tz->polling_frequency * 100);
630 else
631 tz->thermal_zone = thermal_tripless_zone_device_register(
632 type: "acpitz", devdata: tz, ops: &acpi_thermal_zone_ops, NULL);
633
634 if (IS_ERR(ptr: tz->thermal_zone))
635 return PTR_ERR(ptr: 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: 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: 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: tz->thermal_zone);
661 acpi_thermal_zone_sysfs_remove(tz);
662 thermal_zone_device_unregister(tz: 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(d: 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, pathname: "_CRT", NULL, data: &value);
713 acpi_evaluate_integer(handle, pathname: "_HOT", NULL, data: &value);
714 acpi_evaluate_integer(handle, pathname: "_PSV", NULL, data: &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, pathname: name, NULL, data: &value);
720 if (status == AE_NOT_FOUND)
721 break;
722 }
723 acpi_evaluate_integer(handle, pathname: "_TMP", NULL, data: &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(r: &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(r: &tz->thermal_check_count);
765
766 mutex_unlock(lock: &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(list: &tz->trips.passive.trip.devices);
774 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
775 acpi_handle_list_free(list: &tz->trips.active[i].trip.devices);
776
777 kfree(objp: 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 /*
807 * Set the cooling mode [_SCP] to active cooling. This needs to happen before
808 * we retrieve the trip point values.
809 */
810 acpi_execute_simple_method(handle: tz->device->handle, method: "_SCP", ACPI_THERMAL_MODE_ACTIVE);
811
812 /* Get trip points [_ACi, _PSV, etc.] (required). */
813 acpi_thermal_get_trip_points(tz);
814
815 crit_temp = acpi_thermal_get_critical_trip(tz);
816 hot_temp = acpi_thermal_get_hot_trip(tz);
817
818 /* Get temperature [_TMP] (required). */
819 result = acpi_thermal_get_temperature(tz);
820 if (result)
821 goto free_memory;
822
823 /* Determine the default polling frequency [_TZP]. */
824 if (tzp)
825 tz->polling_frequency = tzp;
826 else
827 acpi_thermal_get_polling_frequency(tz);
828
829 acpi_thermal_guess_offset(tz, crit_temp);
830
831 trip = trip_table;
832
833 if (crit_temp != THERMAL_TEMP_INVALID) {
834 trip->type = THERMAL_TRIP_CRITICAL;
835 trip->temperature = acpi_thermal_temp(tz, temp_deci_k: crit_temp);
836 trip++;
837 }
838
839 if (hot_temp != THERMAL_TEMP_INVALID) {
840 trip->type = THERMAL_TRIP_HOT;
841 trip->temperature = acpi_thermal_temp(tz, temp_deci_k: hot_temp);
842 trip++;
843 }
844
845 acpi_trip = &tz->trips.passive.trip;
846 if (acpi_thermal_trip_valid(acpi_trip)) {
847 passive_delay = tz->trips.passive.delay;
848
849 trip->type = THERMAL_TRIP_PASSIVE;
850 trip->temperature = acpi_thermal_temp(tz, temp_deci_k: acpi_trip->temp_dk);
851 trip->priv = acpi_trip;
852 trip++;
853 }
854
855 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
856 acpi_trip = &tz->trips.active[i].trip;
857
858 if (!acpi_thermal_trip_valid(acpi_trip))
859 break;
860
861 trip->type = THERMAL_TRIP_ACTIVE;
862 trip->temperature = acpi_thermal_temp(tz, temp_deci_k: acpi_trip->temp_dk);
863 trip->priv = acpi_trip;
864 trip++;
865 }
866
867 if (trip == trip_table)
868 pr_warn(FW_BUG "No valid trip points!\n");
869
870 result = acpi_thermal_register_thermal_zone(tz, trip_table,
871 trip_count: trip - trip_table,
872 passive_delay);
873 if (result)
874 goto free_memory;
875
876 refcount_set(r: &tz->thermal_check_count, n: 3);
877 mutex_init(&tz->thermal_check_lock);
878 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
879
880 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
881 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temp_dk));
882
883 result = acpi_dev_install_notify_handler(adev: device, ACPI_DEVICE_NOTIFY,
884 handler: acpi_thermal_notify, context: device);
885 if (result)
886 goto flush_wq;
887
888 return 0;
889
890flush_wq:
891 flush_workqueue(acpi_thermal_pm_queue);
892 acpi_thermal_unregister_thermal_zone(tz);
893free_memory:
894 acpi_thermal_free_thermal_zone(tz);
895
896 return result;
897}
898
899static void acpi_thermal_remove(struct acpi_device *device)
900{
901 struct acpi_thermal *tz;
902
903 if (!device || !acpi_driver_data(d: device))
904 return;
905
906 tz = acpi_driver_data(d: device);
907
908 acpi_dev_remove_notify_handler(adev: device, ACPI_DEVICE_NOTIFY,
909 handler: acpi_thermal_notify);
910
911 flush_workqueue(acpi_thermal_pm_queue);
912 acpi_thermal_unregister_thermal_zone(tz);
913 acpi_thermal_free_thermal_zone(tz);
914}
915
916#ifdef CONFIG_PM_SLEEP
917static int acpi_thermal_suspend(struct device *dev)
918{
919 /* Make sure the previously queued thermal check work has been done */
920 flush_workqueue(acpi_thermal_pm_queue);
921 return 0;
922}
923
924static int acpi_thermal_resume(struct device *dev)
925{
926 struct acpi_thermal *tz;
927 int i, j, power_state;
928
929 if (!dev)
930 return -EINVAL;
931
932 tz = acpi_driver_data(to_acpi_device(dev));
933 if (!tz)
934 return -EINVAL;
935
936 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
937 struct acpi_thermal_trip *acpi_trip = &tz->trips.active[i].trip;
938
939 if (!acpi_thermal_trip_valid(acpi_trip))
940 break;
941
942 for (j = 0; j < acpi_trip->devices.count; j++) {
943 acpi_bus_update_power(handle: acpi_trip->devices.handles[j],
944 state_p: &power_state);
945 }
946 }
947
948 acpi_queue_thermal_check(tz);
949
950 return AE_OK;
951}
952#else
953#define acpi_thermal_suspend NULL
954#define acpi_thermal_resume NULL
955#endif
956static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
957
958static const struct acpi_device_id thermal_device_ids[] = {
959 {ACPI_THERMAL_HID, 0},
960 {"", 0},
961};
962MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
963
964static struct acpi_driver acpi_thermal_driver = {
965 .name = "thermal",
966 .class = ACPI_THERMAL_CLASS,
967 .ids = thermal_device_ids,
968 .ops = {
969 .add = acpi_thermal_add,
970 .remove = acpi_thermal_remove,
971 },
972 .drv.pm = &acpi_thermal_pm,
973};
974
975static int thermal_act(const struct dmi_system_id *d)
976{
977 if (act == 0) {
978 pr_notice("%s detected: disabling all active thermal trip points\n",
979 d->ident);
980 act = -1;
981 }
982 return 0;
983}
984
985static int thermal_nocrt(const struct dmi_system_id *d)
986{
987 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
988 d->ident);
989 crt = -1;
990 return 0;
991}
992
993static int thermal_tzp(const struct dmi_system_id *d)
994{
995 if (tzp == 0) {
996 pr_notice("%s detected: enabling thermal zone polling\n",
997 d->ident);
998 tzp = 300; /* 300 dS = 30 Seconds */
999 }
1000 return 0;
1001}
1002
1003static int thermal_psv(const struct dmi_system_id *d)
1004{
1005 if (psv == 0) {
1006 pr_notice("%s detected: disabling all passive thermal trip points\n",
1007 d->ident);
1008 psv = -1;
1009 }
1010 return 0;
1011}
1012
1013static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1014 /*
1015 * Award BIOS on this AOpen makes thermal control almost worthless.
1016 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1017 */
1018 {
1019 .callback = thermal_act,
1020 .ident = "AOpen i915GMm-HFS",
1021 .matches = {
1022 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1023 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1024 },
1025 },
1026 {
1027 .callback = thermal_psv,
1028 .ident = "AOpen i915GMm-HFS",
1029 .matches = {
1030 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1031 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1032 },
1033 },
1034 {
1035 .callback = thermal_tzp,
1036 .ident = "AOpen i915GMm-HFS",
1037 .matches = {
1038 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1039 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1040 },
1041 },
1042 {
1043 .callback = thermal_nocrt,
1044 .ident = "Gigabyte GA-7ZX",
1045 .matches = {
1046 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1047 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1048 },
1049 },
1050 {}
1051};
1052
1053static int __init acpi_thermal_init(void)
1054{
1055 int result;
1056
1057 dmi_check_system(list: thermal_dmi_table);
1058
1059 if (off) {
1060 pr_notice("thermal control disabled\n");
1061 return -ENODEV;
1062 }
1063
1064 acpi_thermal_pm_queue = alloc_workqueue(fmt: "acpi_thermal_pm",
1065 flags: WQ_HIGHPRI | WQ_MEM_RECLAIM, max_active: 0);
1066 if (!acpi_thermal_pm_queue)
1067 return -ENODEV;
1068
1069 result = acpi_bus_register_driver(&acpi_thermal_driver);
1070 if (result < 0) {
1071 destroy_workqueue(wq: acpi_thermal_pm_queue);
1072 return -ENODEV;
1073 }
1074
1075 return 0;
1076}
1077
1078static void __exit acpi_thermal_exit(void)
1079{
1080 acpi_bus_unregister_driver(driver: &acpi_thermal_driver);
1081 destroy_workqueue(wq: acpi_thermal_pm_queue);
1082}
1083
1084module_init(acpi_thermal_init);
1085module_exit(acpi_thermal_exit);
1086
1087MODULE_IMPORT_NS("ACPI_THERMAL");
1088MODULE_AUTHOR("Paul Diefenbaugh");
1089MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
1090MODULE_LICENSE("GPL");
1091

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source code of linux/drivers/acpi/thermal.c