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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#define ACPI_THERMAL_CLASS "thermal_zone"
35#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
36#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
37#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
38#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
39#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
40#define ACPI_THERMAL_NOTIFY_HOT 0xF1
41#define ACPI_THERMAL_MODE_ACTIVE 0x00
42
43#define ACPI_THERMAL_MAX_ACTIVE 10
44#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
45
46MODULE_AUTHOR("Paul Diefenbaugh");
47MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
48MODULE_LICENSE("GPL");
49
50static int act;
51module_param(act, int, 0644);
52MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
53
54static int crt;
55module_param(crt, int, 0644);
56MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
57
58static int tzp;
59module_param(tzp, int, 0444);
60MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
61
62static int nocrt;
63module_param(nocrt, int, 0);
64MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
65
66static int off;
67module_param(off, int, 0);
68MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
69
70static int psv;
71module_param(psv, int, 0644);
72MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
73
74static struct workqueue_struct *acpi_thermal_pm_queue;
75
76static int acpi_thermal_add(struct acpi_device *device);
77static void acpi_thermal_remove(struct acpi_device *device);
78static void acpi_thermal_notify(struct acpi_device *device, u32 event);
79
80static const struct acpi_device_id thermal_device_ids[] = {
81 {ACPI_THERMAL_HID, 0},
82 {"", 0},
83};
84MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
85
86#ifdef CONFIG_PM_SLEEP
87static int acpi_thermal_suspend(struct device *dev);
88static int acpi_thermal_resume(struct device *dev);
89#else
90#define acpi_thermal_suspend NULL
91#define acpi_thermal_resume NULL
92#endif
93static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
94
95static struct acpi_driver acpi_thermal_driver = {
96 .name = "thermal",
97 .class = ACPI_THERMAL_CLASS,
98 .ids = thermal_device_ids,
99 .ops = {
100 .add = acpi_thermal_add,
101 .remove = acpi_thermal_remove,
102 .notify = acpi_thermal_notify,
103 },
104 .drv.pm = &acpi_thermal_pm,
105};
106
107struct acpi_thermal_state {
108 u8 critical:1;
109 u8 hot:1;
110 u8 passive:1;
111 u8 active:1;
112 u8 reserved:4;
113 int active_index;
114};
115
116struct acpi_thermal_state_flags {
117 u8 valid:1;
118 u8 enabled:1;
119 u8 reserved:6;
120};
121
122struct acpi_thermal_critical {
123 struct acpi_thermal_state_flags flags;
124 unsigned long temperature;
125};
126
127struct acpi_thermal_hot {
128 struct acpi_thermal_state_flags flags;
129 unsigned long temperature;
130};
131
132struct acpi_thermal_passive {
133 struct acpi_thermal_state_flags flags;
134 unsigned long temperature;
135 unsigned long tc1;
136 unsigned long tc2;
137 unsigned long tsp;
138 struct acpi_handle_list devices;
139};
140
141struct acpi_thermal_active {
142 struct acpi_thermal_state_flags flags;
143 unsigned long temperature;
144 struct acpi_handle_list devices;
145};
146
147struct acpi_thermal_trips {
148 struct acpi_thermal_critical critical;
149 struct acpi_thermal_hot hot;
150 struct acpi_thermal_passive passive;
151 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
152};
153
154struct acpi_thermal_flags {
155 u8 cooling_mode:1; /* _SCP */
156 u8 devices:1; /* _TZD */
157 u8 reserved:6;
158};
159
160struct acpi_thermal {
161 struct acpi_device *device;
162 acpi_bus_id name;
163 unsigned long temperature;
164 unsigned long last_temperature;
165 unsigned long polling_frequency;
166 volatile u8 zombie;
167 struct acpi_thermal_flags flags;
168 struct acpi_thermal_state state;
169 struct acpi_thermal_trips trips;
170 struct acpi_handle_list devices;
171 struct thermal_zone_device *thermal_zone;
172 int kelvin_offset; /* in millidegrees */
173 struct work_struct thermal_check_work;
174 struct mutex thermal_check_lock;
175 refcount_t thermal_check_count;
176};
177
178/* --------------------------------------------------------------------------
179 Thermal Zone Management
180 -------------------------------------------------------------------------- */
181
182static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
183{
184 acpi_status status = AE_OK;
185 unsigned long long tmp;
186
187 if (!tz)
188 return -EINVAL;
189
190 tz->last_temperature = tz->temperature;
191
192 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
193 if (ACPI_FAILURE(status))
194 return -ENODEV;
195
196 tz->temperature = tmp;
197
198 acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n",
199 tz->temperature);
200
201 return 0;
202}
203
204static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
205{
206 acpi_status status = AE_OK;
207 unsigned long long tmp;
208
209 if (!tz)
210 return -EINVAL;
211
212 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
213 if (ACPI_FAILURE(status))
214 return -ENODEV;
215
216 tz->polling_frequency = tmp;
217 acpi_handle_debug(tz->device->handle, "Polling frequency is %lu dS\n",
218 tz->polling_frequency);
219
220 return 0;
221}
222
223static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
224{
225 if (!tz)
226 return -EINVAL;
227
228 if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
229 "_SCP", mode)))
230 return -ENODEV;
231
232 return 0;
233}
234
235#define ACPI_TRIPS_CRITICAL 0x01
236#define ACPI_TRIPS_HOT 0x02
237#define ACPI_TRIPS_PASSIVE 0x04
238#define ACPI_TRIPS_ACTIVE 0x08
239#define ACPI_TRIPS_DEVICES 0x10
240
241#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
242#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
243
244#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
245 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
246 ACPI_TRIPS_DEVICES)
247
248/*
249 * This exception is thrown out in two cases:
250 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
251 * when re-evaluating the AML code.
252 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
253 * We need to re-bind the cooling devices of a thermal zone when this occurs.
254 */
255#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, tz, str) \
256do { \
257 if (flags != ACPI_TRIPS_INIT) \
258 acpi_handle_info(tz->device->handle, \
259 "ACPI thermal trip point %s changed\n" \
260 "Please report to linux-acpi@vger.kernel.org\n", str); \
261} while (0)
262
263static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
264{
265 acpi_status status;
266 unsigned long long tmp;
267 struct acpi_handle_list devices;
268 int valid = 0;
269 int i;
270
271 /* Critical Shutdown */
272 if (flag & ACPI_TRIPS_CRITICAL) {
273 status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL, &tmp);
274 tz->trips.critical.temperature = tmp;
275 /*
276 * Treat freezing temperatures as invalid as well; some
277 * BIOSes return really low values and cause reboots at startup.
278 * Below zero (Celsius) values clearly aren't right for sure..
279 * ... so lets discard those as invalid.
280 */
281 if (ACPI_FAILURE(status)) {
282 tz->trips.critical.flags.valid = 0;
283 acpi_handle_debug(tz->device->handle,
284 "No critical threshold\n");
285 } else if (tmp <= 2732) {
286 pr_info(FW_BUG "Invalid critical threshold (%llu)\n", tmp);
287 tz->trips.critical.flags.valid = 0;
288 } else {
289 tz->trips.critical.flags.valid = 1;
290 acpi_handle_debug(tz->device->handle,
291 "Found critical threshold [%lu]\n",
292 tz->trips.critical.temperature);
293 }
294 if (tz->trips.critical.flags.valid) {
295 if (crt == -1) {
296 tz->trips.critical.flags.valid = 0;
297 } else if (crt > 0) {
298 unsigned long crt_k = celsius_to_deci_kelvin(crt);
299
300 /*
301 * Allow override critical threshold
302 */
303 if (crt_k > tz->trips.critical.temperature)
304 pr_info("Critical threshold %d C\n", crt);
305
306 tz->trips.critical.temperature = crt_k;
307 }
308 }
309 }
310
311 /* Critical Sleep (optional) */
312 if (flag & ACPI_TRIPS_HOT) {
313 status = acpi_evaluate_integer(tz->device->handle, "_HOT", NULL, &tmp);
314 if (ACPI_FAILURE(status)) {
315 tz->trips.hot.flags.valid = 0;
316 acpi_handle_debug(tz->device->handle,
317 "No hot threshold\n");
318 } else {
319 tz->trips.hot.temperature = tmp;
320 tz->trips.hot.flags.valid = 1;
321 acpi_handle_debug(tz->device->handle,
322 "Found hot threshold [%lu]\n",
323 tz->trips.hot.temperature);
324 }
325 }
326
327 /* Passive (optional) */
328 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
329 flag == ACPI_TRIPS_INIT) {
330 valid = tz->trips.passive.flags.valid;
331 if (psv == -1) {
332 status = AE_SUPPORT;
333 } else if (psv > 0) {
334 tmp = celsius_to_deci_kelvin(psv);
335 status = AE_OK;
336 } else {
337 status = acpi_evaluate_integer(tz->device->handle,
338 "_PSV", NULL, &tmp);
339 }
340
341 if (ACPI_FAILURE(status)) {
342 tz->trips.passive.flags.valid = 0;
343 } else {
344 tz->trips.passive.temperature = tmp;
345 tz->trips.passive.flags.valid = 1;
346 if (flag == ACPI_TRIPS_INIT) {
347 status = acpi_evaluate_integer(tz->device->handle,
348 "_TC1", NULL, &tmp);
349 if (ACPI_FAILURE(status))
350 tz->trips.passive.flags.valid = 0;
351 else
352 tz->trips.passive.tc1 = tmp;
353
354 status = acpi_evaluate_integer(tz->device->handle,
355 "_TC2", NULL, &tmp);
356 if (ACPI_FAILURE(status))
357 tz->trips.passive.flags.valid = 0;
358 else
359 tz->trips.passive.tc2 = tmp;
360
361 status = acpi_evaluate_integer(tz->device->handle,
362 "_TSP", NULL, &tmp);
363 if (ACPI_FAILURE(status))
364 tz->trips.passive.flags.valid = 0;
365 else
366 tz->trips.passive.tsp = tmp;
367 }
368 }
369 }
370 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
371 memset(&devices, 0, sizeof(struct acpi_handle_list));
372 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
373 NULL, &devices);
374 if (ACPI_FAILURE(status)) {
375 acpi_handle_info(tz->device->handle,
376 "Invalid passive threshold\n");
377 tz->trips.passive.flags.valid = 0;
378 } else {
379 tz->trips.passive.flags.valid = 1;
380 }
381
382 if (memcmp(&tz->trips.passive.devices, &devices,
383 sizeof(struct acpi_handle_list))) {
384 memcpy(&tz->trips.passive.devices, &devices,
385 sizeof(struct acpi_handle_list));
386 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
387 }
388 }
389 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
390 if (valid != tz->trips.passive.flags.valid)
391 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
392 }
393
394 /* Active (optional) */
395 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
396 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
397 valid = tz->trips.active[i].flags.valid;
398
399 if (act == -1)
400 break; /* disable all active trip points */
401
402 if (flag == ACPI_TRIPS_INIT || ((flag & ACPI_TRIPS_ACTIVE) &&
403 tz->trips.active[i].flags.valid)) {
404 status = acpi_evaluate_integer(tz->device->handle,
405 name, NULL, &tmp);
406 if (ACPI_FAILURE(status)) {
407 tz->trips.active[i].flags.valid = 0;
408 if (i == 0)
409 break;
410
411 if (act <= 0)
412 break;
413
414 if (i == 1)
415 tz->trips.active[0].temperature = celsius_to_deci_kelvin(act);
416 else
417 /*
418 * Don't allow override higher than
419 * the next higher trip point
420 */
421 tz->trips.active[i-1].temperature =
422 (tz->trips.active[i-2].temperature <
423 celsius_to_deci_kelvin(act) ?
424 tz->trips.active[i-2].temperature :
425 celsius_to_deci_kelvin(act));
426
427 break;
428 } else {
429 tz->trips.active[i].temperature = tmp;
430 tz->trips.active[i].flags.valid = 1;
431 }
432 }
433
434 name[2] = 'L';
435 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid) {
436 memset(&devices, 0, sizeof(struct acpi_handle_list));
437 status = acpi_evaluate_reference(tz->device->handle,
438 name, NULL, &devices);
439 if (ACPI_FAILURE(status)) {
440 acpi_handle_info(tz->device->handle,
441 "Invalid active%d threshold\n", i);
442 tz->trips.active[i].flags.valid = 0;
443 } else {
444 tz->trips.active[i].flags.valid = 1;
445 }
446
447 if (memcmp(&tz->trips.active[i].devices, &devices,
448 sizeof(struct acpi_handle_list))) {
449 memcpy(&tz->trips.active[i].devices, &devices,
450 sizeof(struct acpi_handle_list));
451 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
452 }
453 }
454 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
455 if (valid != tz->trips.active[i].flags.valid)
456 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
457
458 if (!tz->trips.active[i].flags.valid)
459 break;
460 }
461
462 if (flag & ACPI_TRIPS_DEVICES) {
463 memset(&devices, 0, sizeof(devices));
464 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
465 NULL, &devices);
466 if (ACPI_SUCCESS(status) &&
467 memcmp(&tz->devices, &devices, sizeof(devices))) {
468 tz->devices = devices;
469 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
470 }
471 }
472
473 return 0;
474}
475
476static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
477{
478 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
479
480 if (ret)
481 return ret;
482
483 valid = tz->trips.critical.flags.valid |
484 tz->trips.hot.flags.valid |
485 tz->trips.passive.flags.valid;
486
487 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
488 valid |= tz->trips.active[i].flags.valid;
489
490 if (!valid) {
491 pr_warn(FW_BUG "No valid trip found\n");
492 return -ENODEV;
493 }
494 return 0;
495}
496
497/* sys I/F for generic thermal sysfs support */
498
499static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
500{
501 struct acpi_thermal *tz = thermal->devdata;
502 int result;
503
504 if (!tz)
505 return -EINVAL;
506
507 result = acpi_thermal_get_temperature(tz);
508 if (result)
509 return result;
510
511 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature,
512 tz->kelvin_offset);
513 return 0;
514}
515
516static int thermal_get_trip_type(struct thermal_zone_device *thermal,
517 int trip, enum thermal_trip_type *type)
518{
519 struct acpi_thermal *tz = thermal->devdata;
520 int i;
521
522 if (!tz || trip < 0)
523 return -EINVAL;
524
525 if (tz->trips.critical.flags.valid) {
526 if (!trip) {
527 *type = THERMAL_TRIP_CRITICAL;
528 return 0;
529 }
530 trip--;
531 }
532
533 if (tz->trips.hot.flags.valid) {
534 if (!trip) {
535 *type = THERMAL_TRIP_HOT;
536 return 0;
537 }
538 trip--;
539 }
540
541 if (tz->trips.passive.flags.valid) {
542 if (!trip) {
543 *type = THERMAL_TRIP_PASSIVE;
544 return 0;
545 }
546 trip--;
547 }
548
549 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].flags.valid; i++) {
550 if (!trip) {
551 *type = THERMAL_TRIP_ACTIVE;
552 return 0;
553 }
554 trip--;
555 }
556
557 return -EINVAL;
558}
559
560static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
561 int trip, int *temp)
562{
563 struct acpi_thermal *tz = thermal->devdata;
564 int i;
565
566 if (!tz || trip < 0)
567 return -EINVAL;
568
569 if (tz->trips.critical.flags.valid) {
570 if (!trip) {
571 *temp = deci_kelvin_to_millicelsius_with_offset(
572 tz->trips.critical.temperature,
573 tz->kelvin_offset);
574 return 0;
575 }
576 trip--;
577 }
578
579 if (tz->trips.hot.flags.valid) {
580 if (!trip) {
581 *temp = deci_kelvin_to_millicelsius_with_offset(
582 tz->trips.hot.temperature,
583 tz->kelvin_offset);
584 return 0;
585 }
586 trip--;
587 }
588
589 if (tz->trips.passive.flags.valid) {
590 if (!trip) {
591 *temp = deci_kelvin_to_millicelsius_with_offset(
592 tz->trips.passive.temperature,
593 tz->kelvin_offset);
594 return 0;
595 }
596 trip--;
597 }
598
599 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
600 tz->trips.active[i].flags.valid; i++) {
601 if (!trip) {
602 *temp = deci_kelvin_to_millicelsius_with_offset(
603 tz->trips.active[i].temperature,
604 tz->kelvin_offset);
605 return 0;
606 }
607 trip--;
608 }
609
610 return -EINVAL;
611}
612
613static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
614 int *temperature)
615{
616 struct acpi_thermal *tz = thermal->devdata;
617
618 if (tz->trips.critical.flags.valid) {
619 *temperature = deci_kelvin_to_millicelsius_with_offset(
620 tz->trips.critical.temperature,
621 tz->kelvin_offset);
622 return 0;
623 }
624
625 return -EINVAL;
626}
627
628static int thermal_get_trend(struct thermal_zone_device *thermal,
629 int trip, enum thermal_trend *trend)
630{
631 struct acpi_thermal *tz = thermal->devdata;
632 enum thermal_trip_type type;
633 int i;
634
635 if (thermal_get_trip_type(thermal, trip, &type))
636 return -EINVAL;
637
638 if (type == THERMAL_TRIP_ACTIVE) {
639 int trip_temp;
640 int temp = deci_kelvin_to_millicelsius_with_offset(
641 tz->temperature, tz->kelvin_offset);
642 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
643 return -EINVAL;
644
645 if (temp > trip_temp) {
646 *trend = THERMAL_TREND_RAISING;
647 return 0;
648 } else {
649 /* Fall back on default trend */
650 return -EINVAL;
651 }
652 }
653
654 /*
655 * tz->temperature has already been updated by generic thermal layer,
656 * before this callback being invoked
657 */
658 i = tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature) +
659 tz->trips.passive.tc2 * (tz->temperature - tz->trips.passive.temperature);
660
661 if (i > 0)
662 *trend = THERMAL_TREND_RAISING;
663 else if (i < 0)
664 *trend = THERMAL_TREND_DROPPING;
665 else
666 *trend = THERMAL_TREND_STABLE;
667
668 return 0;
669}
670
671static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
672{
673 struct acpi_thermal *tz = thermal->devdata;
674
675 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
676 dev_name(&tz->device->dev),
677 ACPI_THERMAL_NOTIFY_HOT, 1);
678}
679
680static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
681{
682 struct acpi_thermal *tz = thermal->devdata;
683
684 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
685 dev_name(&tz->device->dev),
686 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
687
688 thermal_zone_device_critical(thermal);
689}
690
691static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
692 struct thermal_cooling_device *cdev,
693 bool bind)
694{
695 struct acpi_device *device = cdev->devdata;
696 struct acpi_thermal *tz = thermal->devdata;
697 struct acpi_device *dev;
698 acpi_handle handle;
699 int i;
700 int j;
701 int trip = -1;
702 int result = 0;
703
704 if (tz->trips.critical.flags.valid)
705 trip++;
706
707 if (tz->trips.hot.flags.valid)
708 trip++;
709
710 if (tz->trips.passive.flags.valid) {
711 trip++;
712 for (i = 0; i < tz->trips.passive.devices.count; i++) {
713 handle = tz->trips.passive.devices.handles[i];
714 dev = acpi_fetch_acpi_dev(handle);
715 if (dev != device)
716 continue;
717
718 if (bind)
719 result = thermal_zone_bind_cooling_device(
720 thermal, trip, cdev,
721 THERMAL_NO_LIMIT,
722 THERMAL_NO_LIMIT,
723 THERMAL_WEIGHT_DEFAULT);
724 else
725 result =
726 thermal_zone_unbind_cooling_device(
727 thermal, trip, cdev);
728
729 if (result)
730 goto failed;
731 }
732 }
733
734 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
735 if (!tz->trips.active[i].flags.valid)
736 break;
737
738 trip++;
739 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
740 handle = tz->trips.active[i].devices.handles[j];
741 dev = acpi_fetch_acpi_dev(handle);
742 if (dev != device)
743 continue;
744
745 if (bind)
746 result = thermal_zone_bind_cooling_device(
747 thermal, trip, cdev,
748 THERMAL_NO_LIMIT,
749 THERMAL_NO_LIMIT,
750 THERMAL_WEIGHT_DEFAULT);
751 else
752 result = thermal_zone_unbind_cooling_device(
753 thermal, trip, cdev);
754
755 if (result)
756 goto failed;
757 }
758 }
759
760failed:
761 return result;
762}
763
764static int
765acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
766 struct thermal_cooling_device *cdev)
767{
768 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
769}
770
771static int
772acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
773 struct thermal_cooling_device *cdev)
774{
775 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
776}
777
778static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
779 .bind = acpi_thermal_bind_cooling_device,
780 .unbind = acpi_thermal_unbind_cooling_device,
781 .get_temp = thermal_get_temp,
782 .get_trip_type = thermal_get_trip_type,
783 .get_trip_temp = thermal_get_trip_temp,
784 .get_crit_temp = thermal_get_crit_temp,
785 .get_trend = thermal_get_trend,
786 .hot = acpi_thermal_zone_device_hot,
787 .critical = acpi_thermal_zone_device_critical,
788};
789
790static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
791{
792 int trips = 0;
793 int result;
794 acpi_status status;
795 int i;
796
797 if (tz->trips.critical.flags.valid)
798 trips++;
799
800 if (tz->trips.hot.flags.valid)
801 trips++;
802
803 if (tz->trips.passive.flags.valid)
804 trips++;
805
806 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].flags.valid;
807 i++, trips++);
808
809 if (tz->trips.passive.flags.valid)
810 tz->thermal_zone = thermal_zone_device_register("acpitz", trips, 0, tz,
811 &acpi_thermal_zone_ops, NULL,
812 tz->trips.passive.tsp * 100,
813 tz->polling_frequency * 100);
814 else
815 tz->thermal_zone =
816 thermal_zone_device_register("acpitz", trips, 0, tz,
817 &acpi_thermal_zone_ops, NULL,
818 0, tz->polling_frequency * 100);
819
820 if (IS_ERR(tz->thermal_zone))
821 return -ENODEV;
822
823 result = sysfs_create_link(&tz->device->dev.kobj,
824 &tz->thermal_zone->device.kobj, "thermal_zone");
825 if (result)
826 goto unregister_tzd;
827
828 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
829 &tz->device->dev.kobj, "device");
830 if (result)
831 goto remove_tz_link;
832
833 status = acpi_bus_attach_private_data(tz->device->handle,
834 tz->thermal_zone);
835 if (ACPI_FAILURE(status)) {
836 result = -ENODEV;
837 goto remove_dev_link;
838 }
839
840 result = thermal_zone_device_enable(tz->thermal_zone);
841 if (result)
842 goto acpi_bus_detach;
843
844 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
845 tz->thermal_zone->id);
846
847 return 0;
848
849acpi_bus_detach:
850 acpi_bus_detach_private_data(tz->device->handle);
851remove_dev_link:
852 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
853remove_tz_link:
854 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
855unregister_tzd:
856 thermal_zone_device_unregister(tz->thermal_zone);
857
858 return result;
859}
860
861static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
862{
863 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
864 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
865 thermal_zone_device_unregister(tz->thermal_zone);
866 tz->thermal_zone = NULL;
867 acpi_bus_detach_private_data(tz->device->handle);
868}
869
870
871/* --------------------------------------------------------------------------
872 Driver Interface
873 -------------------------------------------------------------------------- */
874
875static void acpi_queue_thermal_check(struct acpi_thermal *tz)
876{
877 if (!work_pending(&tz->thermal_check_work))
878 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
879}
880
881static void acpi_thermal_notify(struct acpi_device *device, u32 event)
882{
883 struct acpi_thermal *tz = acpi_driver_data(device);
884
885 if (!tz)
886 return;
887
888 switch (event) {
889 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
890 acpi_queue_thermal_check(tz);
891 break;
892 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
893 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
894 acpi_queue_thermal_check(tz);
895 acpi_bus_generate_netlink_event(device->pnp.device_class,
896 dev_name(&device->dev), event, 0);
897 break;
898 case ACPI_THERMAL_NOTIFY_DEVICES:
899 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
900 acpi_queue_thermal_check(tz);
901 acpi_bus_generate_netlink_event(device->pnp.device_class,
902 dev_name(&device->dev), event, 0);
903 break;
904 default:
905 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
906 event);
907 break;
908 }
909}
910
911/*
912 * On some platforms, the AML code has dependency about
913 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
914 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
915 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
916 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
917 * if _TMP has never been evaluated.
918 *
919 * As this dependency is totally transparent to OS, evaluate
920 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
921 * _TMP, before they are actually used.
922 */
923static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
924{
925 acpi_handle handle = tz->device->handle;
926 unsigned long long value;
927 int i;
928
929 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
930 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
931 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
932 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
933 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
934 acpi_status status;
935
936 status = acpi_evaluate_integer(handle, name, NULL, &value);
937 if (status == AE_NOT_FOUND)
938 break;
939 }
940 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
941}
942
943static int acpi_thermal_get_info(struct acpi_thermal *tz)
944{
945 int result;
946
947 if (!tz)
948 return -EINVAL;
949
950 acpi_thermal_aml_dependency_fix(tz);
951
952 /* Get trip points [_CRT, _PSV, etc.] (required) */
953 result = acpi_thermal_get_trip_points(tz);
954 if (result)
955 return result;
956
957 /* Get temperature [_TMP] (required) */
958 result = acpi_thermal_get_temperature(tz);
959 if (result)
960 return result;
961
962 /* Set the cooling mode [_SCP] to active cooling (default) */
963 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
964 if (!result)
965 tz->flags.cooling_mode = 1;
966
967 /* Get default polling frequency [_TZP] (optional) */
968 if (tzp)
969 tz->polling_frequency = tzp;
970 else
971 acpi_thermal_get_polling_frequency(tz);
972
973 return 0;
974}
975
976/*
977 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
978 * handles temperature values with a single decimal place. As a consequence,
979 * some implementations use an offset of 273.1 and others use an offset of
980 * 273.2. Try to find out which one is being used, to present the most
981 * accurate and visually appealing number.
982 *
983 * The heuristic below should work for all ACPI thermal zones which have a
984 * critical trip point with a value being a multiple of 0.5 degree Celsius.
985 */
986static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
987{
988 if (tz->trips.critical.flags.valid &&
989 (tz->trips.critical.temperature % 5) == 1)
990 tz->kelvin_offset = 273100;
991 else
992 tz->kelvin_offset = 273200;
993}
994
995static void acpi_thermal_check_fn(struct work_struct *work)
996{
997 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
998 thermal_check_work);
999
1000 /*
1001 * In general, it is not sufficient to check the pending bit, because
1002 * subsequent instances of this function may be queued after one of them
1003 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
1004 * one of them is running, though, because it may have done the actual
1005 * check some time ago, so allow at least one of them to block on the
1006 * mutex while another one is running the update.
1007 */
1008 if (!refcount_dec_not_one(&tz->thermal_check_count))
1009 return;
1010
1011 mutex_lock(&tz->thermal_check_lock);
1012
1013 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
1014
1015 refcount_inc(&tz->thermal_check_count);
1016
1017 mutex_unlock(&tz->thermal_check_lock);
1018}
1019
1020static int acpi_thermal_add(struct acpi_device *device)
1021{
1022 struct acpi_thermal *tz;
1023 int result;
1024
1025 if (!device)
1026 return -EINVAL;
1027
1028 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1029 if (!tz)
1030 return -ENOMEM;
1031
1032 tz->device = device;
1033 strcpy(tz->name, device->pnp.bus_id);
1034 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1035 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1036 device->driver_data = tz;
1037
1038 result = acpi_thermal_get_info(tz);
1039 if (result)
1040 goto free_memory;
1041
1042 acpi_thermal_guess_offset(tz);
1043
1044 result = acpi_thermal_register_thermal_zone(tz);
1045 if (result)
1046 goto free_memory;
1047
1048 refcount_set(&tz->thermal_check_count, 3);
1049 mutex_init(&tz->thermal_check_lock);
1050 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1051
1052 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
1053 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
1054 goto end;
1055
1056free_memory:
1057 kfree(tz);
1058end:
1059 return result;
1060}
1061
1062static void acpi_thermal_remove(struct acpi_device *device)
1063{
1064 struct acpi_thermal *tz;
1065
1066 if (!device || !acpi_driver_data(device))
1067 return;
1068
1069 flush_workqueue(acpi_thermal_pm_queue);
1070 tz = acpi_driver_data(device);
1071
1072 acpi_thermal_unregister_thermal_zone(tz);
1073 kfree(tz);
1074}
1075
1076#ifdef CONFIG_PM_SLEEP
1077static int acpi_thermal_suspend(struct device *dev)
1078{
1079 /* Make sure the previously queued thermal check work has been done */
1080 flush_workqueue(acpi_thermal_pm_queue);
1081 return 0;
1082}
1083
1084static int acpi_thermal_resume(struct device *dev)
1085{
1086 struct acpi_thermal *tz;
1087 int i, j, power_state, result;
1088
1089 if (!dev)
1090 return -EINVAL;
1091
1092 tz = acpi_driver_data(to_acpi_device(dev));
1093 if (!tz)
1094 return -EINVAL;
1095
1096 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1097 if (!tz->trips.active[i].flags.valid)
1098 break;
1099
1100 tz->trips.active[i].flags.enabled = 1;
1101 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1102 result = acpi_bus_update_power(
1103 tz->trips.active[i].devices.handles[j],
1104 &power_state);
1105 if (result || (power_state != ACPI_STATE_D0)) {
1106 tz->trips.active[i].flags.enabled = 0;
1107 break;
1108 }
1109 }
1110 tz->state.active |= tz->trips.active[i].flags.enabled;
1111 }
1112
1113 acpi_queue_thermal_check(tz);
1114
1115 return AE_OK;
1116}
1117#endif
1118
1119static int thermal_act(const struct dmi_system_id *d) {
1120 if (act == 0) {
1121 pr_notice("%s detected: disabling all active thermal trip points\n",
1122 d->ident);
1123 act = -1;
1124 }
1125 return 0;
1126}
1127static int thermal_nocrt(const struct dmi_system_id *d) {
1128 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
1129 d->ident);
1130 nocrt = 1;
1131 return 0;
1132}
1133static int thermal_tzp(const struct dmi_system_id *d) {
1134 if (tzp == 0) {
1135 pr_notice("%s detected: enabling thermal zone polling\n",
1136 d->ident);
1137 tzp = 300; /* 300 dS = 30 Seconds */
1138 }
1139 return 0;
1140}
1141static int thermal_psv(const struct dmi_system_id *d) {
1142 if (psv == 0) {
1143 pr_notice("%s detected: disabling all passive thermal trip points\n",
1144 d->ident);
1145 psv = -1;
1146 }
1147 return 0;
1148}
1149
1150static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1151 /*
1152 * Award BIOS on this AOpen makes thermal control almost worthless.
1153 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1154 */
1155 {
1156 .callback = thermal_act,
1157 .ident = "AOpen i915GMm-HFS",
1158 .matches = {
1159 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1160 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1161 },
1162 },
1163 {
1164 .callback = thermal_psv,
1165 .ident = "AOpen i915GMm-HFS",
1166 .matches = {
1167 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1168 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1169 },
1170 },
1171 {
1172 .callback = thermal_tzp,
1173 .ident = "AOpen i915GMm-HFS",
1174 .matches = {
1175 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1176 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1177 },
1178 },
1179 {
1180 .callback = thermal_nocrt,
1181 .ident = "Gigabyte GA-7ZX",
1182 .matches = {
1183 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1184 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1185 },
1186 },
1187 {}
1188};
1189
1190static int __init acpi_thermal_init(void)
1191{
1192 int result;
1193
1194 dmi_check_system(thermal_dmi_table);
1195
1196 if (off) {
1197 pr_notice("thermal control disabled\n");
1198 return -ENODEV;
1199 }
1200
1201 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1202 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1203 if (!acpi_thermal_pm_queue)
1204 return -ENODEV;
1205
1206 result = acpi_bus_register_driver(&acpi_thermal_driver);
1207 if (result < 0) {
1208 destroy_workqueue(acpi_thermal_pm_queue);
1209 return -ENODEV;
1210 }
1211
1212 return 0;
1213}
1214
1215static void __exit acpi_thermal_exit(void)
1216{
1217 acpi_bus_unregister_driver(&acpi_thermal_driver);
1218 destroy_workqueue(acpi_thermal_pm_queue);
1219}
1220
1221module_init(acpi_thermal_init);
1222module_exit(acpi_thermal_exit);