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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 *
8 * This driver fully implements the ACPI thermal policy as described in the
9 * ACPI 2.0 Specification.
10 *
11 * TBD: 1. Implement passive cooling hysteresis.
12 * 2. Enhance passive cooling (CPU) states/limit interface to support
13 * concepts of 'multiple limiters', upper/lower limits, etc.
14 */
15
16#define pr_fmt(fmt) "ACPI: thermal: " fmt
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/dmi.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <linux/types.h>
24#include <linux/jiffies.h>
25#include <linux/kmod.h>
26#include <linux/reboot.h>
27#include <linux/device.h>
28#include <linux/thermal.h>
29#include <linux/acpi.h>
30#include <linux/workqueue.h>
31#include <linux/uaccess.h>
32#include <linux/units.h>
33
34#include "internal.h"
35
36#define ACPI_THERMAL_CLASS "thermal_zone"
37#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
38#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
39#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
40#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
41#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
42#define ACPI_THERMAL_NOTIFY_HOT 0xF1
43#define ACPI_THERMAL_MODE_ACTIVE 0x00
44
45#define ACPI_THERMAL_MAX_ACTIVE 10
46#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
47
48#define ACPI_THERMAL_TRIP_PASSIVE (-1)
49
50#define ACPI_THERMAL_MAX_NR_TRIPS (ACPI_THERMAL_MAX_ACTIVE + 3)
51
52/*
53 * This exception is thrown out in two cases:
54 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
55 * when re-evaluating the AML code.
56 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
57 * We need to re-bind the cooling devices of a thermal zone when this occurs.
58 */
59#define ACPI_THERMAL_TRIPS_EXCEPTION(tz, str) \
60do { \
61 acpi_handle_info(tz->device->handle, \
62 "ACPI thermal trip point %s changed\n" \
63 "Please report to linux-acpi@vger.kernel.org\n", str); \
64} while (0)
65
66static int act;
67module_param(act, int, 0644);
68MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
69
70static int crt;
71module_param(crt, int, 0644);
72MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
73
74static int tzp;
75module_param(tzp, int, 0444);
76MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
77
78static int off;
79module_param(off, int, 0);
80MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
81
82static int psv;
83module_param(psv, int, 0644);
84MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
85
86static struct workqueue_struct *acpi_thermal_pm_queue;
87
88struct acpi_thermal_trip {
89 unsigned long temp_dk;
90 struct acpi_handle_list devices;
91};
92
93struct acpi_thermal_passive {
94 struct acpi_thermal_trip trip;
95 unsigned long tc1;
96 unsigned long tc2;
97 unsigned long delay;
98};
99
100struct acpi_thermal_active {
101 struct acpi_thermal_trip trip;
102};
103
104struct acpi_thermal_trips {
105 struct acpi_thermal_passive passive;
106 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
107};
108
109struct acpi_thermal {
110 struct acpi_device *device;
111 acpi_bus_id name;
112 unsigned long temp_dk;
113 unsigned long last_temp_dk;
114 unsigned long polling_frequency;
115 volatile u8 zombie;
116 struct acpi_thermal_trips trips;
117 struct thermal_zone_device *thermal_zone;
118 int kelvin_offset; /* in millidegrees */
119 struct work_struct thermal_check_work;
120 struct mutex thermal_check_lock;
121 refcount_t thermal_check_count;
122};
123
124/* --------------------------------------------------------------------------
125 Thermal Zone Management
126 -------------------------------------------------------------------------- */
127
128static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
129{
130 acpi_status status = AE_OK;
131 unsigned long long tmp;
132
133 if (!tz)
134 return -EINVAL;
135
136 tz->last_temp_dk = tz->temp_dk;
137
138 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
139 if (ACPI_FAILURE(status))
140 return -ENODEV;
141
142 tz->temp_dk = tmp;
143
144 acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n",
145 tz->temp_dk);
146
147 return 0;
148}
149
150static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
151{
152 acpi_status status = AE_OK;
153 unsigned long long tmp;
154
155 if (!tz)
156 return -EINVAL;
157
158 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
159 if (ACPI_FAILURE(status))
160 return -ENODEV;
161
162 tz->polling_frequency = tmp;
163 acpi_handle_debug(tz->device->handle, "Polling frequency is %lu dS\n",
164 tz->polling_frequency);
165
166 return 0;
167}
168
169static int acpi_thermal_temp(struct acpi_thermal *tz, int temp_deci_k)
170{
171 int temp;
172
173 if (temp_deci_k == THERMAL_TEMP_INVALID)
174 return THERMAL_TEMP_INVALID;
175
176 temp = deci_kelvin_to_millicelsius_with_offset(temp_deci_k,
177 tz->kelvin_offset);
178 if (temp <= 0)
179 return THERMAL_TEMP_INVALID;
180
181 return temp;
182}
183
184static bool acpi_thermal_trip_valid(struct acpi_thermal_trip *acpi_trip)
185{
186 return acpi_trip->temp_dk != THERMAL_TEMP_INVALID;
187}
188
189static int active_trip_index(struct acpi_thermal *tz,
190 struct acpi_thermal_trip *acpi_trip)
191{
192 struct acpi_thermal_active *active;
193
194 active = container_of(acpi_trip, struct acpi_thermal_active, trip);
195 return active - tz->trips.active;
196}
197
198static long get_passive_temp(struct acpi_thermal *tz)
199{
200 int temp;
201
202 if (acpi_passive_trip_temp(tz->device, &temp))
203 return THERMAL_TEMP_INVALID;
204
205 return temp;
206}
207
208static long get_active_temp(struct acpi_thermal *tz, int index)
209{
210 int temp;
211
212 if (acpi_active_trip_temp(tz->device, index, &temp))
213 return THERMAL_TEMP_INVALID;
214
215 /*
216 * If an override has been provided, apply it so there are no active
217 * trips with thresholds greater than the override.
218 */
219 if (act > 0) {
220 unsigned long long override = celsius_to_deci_kelvin(act);
221
222 if (temp > override)
223 return override;
224 }
225 return temp;
226}
227
228static void acpi_thermal_update_trip(struct acpi_thermal *tz,
229 const struct thermal_trip *trip)
230{
231 struct acpi_thermal_trip *acpi_trip = trip->priv;
232
233 if (trip->type == THERMAL_TRIP_PASSIVE) {
234 if (psv > 0)
235 return;
236
237 acpi_trip->temp_dk = get_passive_temp(tz);
238 } else {
239 int index = active_trip_index(tz, acpi_trip);
240
241 acpi_trip->temp_dk = get_active_temp(tz, index);
242 }
243
244 if (!acpi_thermal_trip_valid(acpi_trip))
245 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
246}
247
248static bool update_trip_devices(struct acpi_thermal *tz,
249 struct acpi_thermal_trip *acpi_trip,
250 int index, bool compare)
251{
252 struct acpi_handle_list devices = { 0 };
253 char method[] = "_PSL";
254
255 if (index != ACPI_THERMAL_TRIP_PASSIVE) {
256 method[1] = 'A';
257 method[2] = 'L';
258 method[3] = '0' + index;
259 }
260
261 if (!acpi_evaluate_reference(tz->device->handle, method, NULL, &devices)) {
262 acpi_handle_info(tz->device->handle, "%s evaluation failure\n", method);
263 return false;
264 }
265
266 if (acpi_handle_list_equal(&acpi_trip->devices, &devices)) {
267 acpi_handle_list_free(&devices);
268 return true;
269 }
270
271 if (compare)
272 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "device");
273
274 acpi_handle_list_replace(&acpi_trip->devices, &devices);
275 return true;
276}
277
278static void acpi_thermal_update_trip_devices(struct acpi_thermal *tz,
279 const struct thermal_trip *trip)
280{
281 struct acpi_thermal_trip *acpi_trip = trip->priv;
282 int index = trip->type == THERMAL_TRIP_PASSIVE ?
283 ACPI_THERMAL_TRIP_PASSIVE : active_trip_index(tz, acpi_trip);
284
285 if (update_trip_devices(tz, acpi_trip, index, true))
286 return;
287
288 acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
289 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
290}
291
292struct adjust_trip_data {
293 struct acpi_thermal *tz;
294 u32 event;
295};
296
297static int acpi_thermal_adjust_trip(struct thermal_trip *trip, void *data)
298{
299 struct acpi_thermal_trip *acpi_trip = trip->priv;
300 struct adjust_trip_data *atd = data;
301 struct acpi_thermal *tz = atd->tz;
302 int temp;
303
304 if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
305 return 0;
306
307 if (atd->event == ACPI_THERMAL_NOTIFY_THRESHOLDS)
308 acpi_thermal_update_trip(tz, trip);
309 else
310 acpi_thermal_update_trip_devices(tz, trip);
311
312 if (acpi_thermal_trip_valid(acpi_trip))
313 temp = acpi_thermal_temp(tz, acpi_trip->temp_dk);
314 else
315 temp = THERMAL_TEMP_INVALID;
316
317 thermal_zone_set_trip_temp(tz->thermal_zone, trip, temp);
318
319 return 0;
320}
321
322static void acpi_queue_thermal_check(struct acpi_thermal *tz)
323{
324 if (!work_pending(&tz->thermal_check_work))
325 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
326}
327
328static void acpi_thermal_trips_update(struct acpi_thermal *tz, u32 event)
329{
330 struct adjust_trip_data atd = { .tz = tz, .event = event };
331 struct acpi_device *adev = tz->device;
332
333 /*
334 * Use thermal_zone_for_each_trip() to carry out the trip points
335 * update, so as to protect thermal_get_trend() from getting stale
336 * trip point temperatures and to prevent thermal_zone_device_update()
337 * invoked from acpi_thermal_check_fn() from producing inconsistent
338 * results.
339 */
340 thermal_zone_for_each_trip(tz->thermal_zone,
341 acpi_thermal_adjust_trip, &atd);
342 acpi_queue_thermal_check(tz);
343 acpi_bus_generate_netlink_event(adev->pnp.device_class,
344 dev_name(&adev->dev), event, 0);
345}
346
347static int acpi_thermal_get_critical_trip(struct acpi_thermal *tz)
348{
349 int temp;
350
351 if (crt > 0) {
352 temp = celsius_to_deci_kelvin(crt);
353 goto set;
354 }
355 if (crt == -1) {
356 acpi_handle_debug(tz->device->handle, "Critical threshold disabled\n");
357 return THERMAL_TEMP_INVALID;
358 }
359
360 if (acpi_critical_trip_temp(tz->device, &temp))
361 return THERMAL_TEMP_INVALID;
362
363 if (temp <= 2732) {
364 /*
365 * Below zero (Celsius) values clearly aren't right for sure,
366 * so discard them as invalid.
367 */
368 pr_info(FW_BUG "Invalid critical threshold (%d)\n", temp);
369 return THERMAL_TEMP_INVALID;
370 }
371
372set:
373 acpi_handle_debug(tz->device->handle, "Critical threshold [%d]\n", temp);
374 return temp;
375}
376
377static int acpi_thermal_get_hot_trip(struct acpi_thermal *tz)
378{
379 int temp;
380
381 if (acpi_hot_trip_temp(tz->device, &temp) || temp == THERMAL_TEMP_INVALID) {
382 acpi_handle_debug(tz->device->handle, "No hot threshold\n");
383 return THERMAL_TEMP_INVALID;
384 }
385
386 acpi_handle_debug(tz->device->handle, "Hot threshold [%d]\n", temp);
387 return temp;
388}
389
390static bool passive_trip_params_init(struct acpi_thermal *tz)
391{
392 unsigned long long tmp;
393 acpi_status status;
394
395 status = acpi_evaluate_integer(tz->device->handle, "_TC1", NULL, &tmp);
396 if (ACPI_FAILURE(status))
397 return false;
398
399 tz->trips.passive.tc1 = tmp;
400
401 status = acpi_evaluate_integer(tz->device->handle, "_TC2", NULL, &tmp);
402 if (ACPI_FAILURE(status))
403 return false;
404
405 tz->trips.passive.tc2 = tmp;
406
407 status = acpi_evaluate_integer(tz->device->handle, "_TFP", NULL, &tmp);
408 if (ACPI_SUCCESS(status)) {
409 tz->trips.passive.delay = tmp;
410 return true;
411 }
412
413 status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp);
414 if (ACPI_FAILURE(status))
415 return false;
416
417 tz->trips.passive.delay = tmp * 100;
418
419 return true;
420}
421
422static bool acpi_thermal_init_trip(struct acpi_thermal *tz, int index)
423{
424 struct acpi_thermal_trip *acpi_trip;
425 long temp;
426
427 if (index == ACPI_THERMAL_TRIP_PASSIVE) {
428 acpi_trip = &tz->trips.passive.trip;
429
430 if (psv == -1)
431 goto fail;
432
433 if (!passive_trip_params_init(tz))
434 goto fail;
435
436 temp = psv > 0 ? celsius_to_deci_kelvin(psv) :
437 get_passive_temp(tz);
438 } else {
439 acpi_trip = &tz->trips.active[index].trip;
440
441 if (act == -1)
442 goto fail;
443
444 temp = get_active_temp(tz, index);
445 }
446
447 if (temp == THERMAL_TEMP_INVALID)
448 goto fail;
449
450 if (!update_trip_devices(tz, acpi_trip, index, false))
451 goto fail;
452
453 acpi_trip->temp_dk = temp;
454 return true;
455
456fail:
457 acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
458 return false;
459}
460
461static void acpi_thermal_get_trip_points(struct acpi_thermal *tz)
462{
463 int i;
464
465 acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE);
466
467 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
468 if (!acpi_thermal_init_trip(tz, i))
469 break;
470 }
471
472 while (++i < ACPI_THERMAL_MAX_ACTIVE)
473 tz->trips.active[i].trip.temp_dk = THERMAL_TEMP_INVALID;
474}
475
476/* sys I/F for generic thermal sysfs support */
477
478static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
479{
480 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
481 int result;
482
483 if (!tz)
484 return -EINVAL;
485
486 result = acpi_thermal_get_temperature(tz);
487 if (result)
488 return result;
489
490 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temp_dk,
491 tz->kelvin_offset);
492 return 0;
493}
494
495static int thermal_get_trend(struct thermal_zone_device *thermal,
496 const struct thermal_trip *trip,
497 enum thermal_trend *trend)
498{
499 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
500 struct acpi_thermal_trip *acpi_trip;
501 int t;
502
503 if (!tz || !trip)
504 return -EINVAL;
505
506 acpi_trip = trip->priv;
507 if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
508 return -EINVAL;
509
510 switch (trip->type) {
511 case THERMAL_TRIP_PASSIVE:
512 t = tz->trips.passive.tc1 * (tz->temp_dk -
513 tz->last_temp_dk) +
514 tz->trips.passive.tc2 * (tz->temp_dk -
515 acpi_trip->temp_dk);
516 if (t > 0)
517 *trend = THERMAL_TREND_RAISING;
518 else if (t < 0)
519 *trend = THERMAL_TREND_DROPPING;
520 else
521 *trend = THERMAL_TREND_STABLE;
522
523 return 0;
524
525 case THERMAL_TRIP_ACTIVE:
526 t = acpi_thermal_temp(tz, tz->temp_dk);
527 if (t <= trip->temperature)
528 break;
529
530 *trend = THERMAL_TREND_RAISING;
531
532 return 0;
533
534 default:
535 break;
536 }
537
538 return -EINVAL;
539}
540
541static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
542{
543 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
544
545 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
546 dev_name(&tz->device->dev),
547 ACPI_THERMAL_NOTIFY_HOT, 1);
548}
549
550static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
551{
552 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
553
554 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
555 dev_name(&tz->device->dev),
556 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
557
558 thermal_zone_device_critical(thermal);
559}
560
561static bool acpi_thermal_should_bind_cdev(struct thermal_zone_device *thermal,
562 const struct thermal_trip *trip,
563 struct thermal_cooling_device *cdev,
564 struct cooling_spec *c)
565{
566 struct acpi_thermal_trip *acpi_trip = trip->priv;
567 struct acpi_device *cdev_adev = cdev->devdata;
568 int i;
569
570 /* Skip critical and hot trips. */
571 if (!acpi_trip)
572 return false;
573
574 for (i = 0; i < acpi_trip->devices.count; i++) {
575 acpi_handle handle = acpi_trip->devices.handles[i];
576
577 if (acpi_fetch_acpi_dev(handle) == cdev_adev)
578 return true;
579 }
580
581 return false;
582}
583
584static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
585 .should_bind = acpi_thermal_should_bind_cdev,
586 .get_temp = thermal_get_temp,
587 .get_trend = thermal_get_trend,
588 .hot = acpi_thermal_zone_device_hot,
589 .critical = acpi_thermal_zone_device_critical,
590};
591
592static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz)
593{
594 struct device *tzdev = thermal_zone_device(tz->thermal_zone);
595 int ret;
596
597 ret = sysfs_create_link(&tz->device->dev.kobj,
598 &tzdev->kobj, "thermal_zone");
599 if (ret)
600 return ret;
601
602 ret = sysfs_create_link(&tzdev->kobj,
603 &tz->device->dev.kobj, "device");
604 if (ret)
605 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
606
607 return ret;
608}
609
610static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz)
611{
612 struct device *tzdev = thermal_zone_device(tz->thermal_zone);
613
614 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
615 sysfs_remove_link(&tzdev->kobj, "device");
616}
617
618static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz,
619 const struct thermal_trip *trip_table,
620 unsigned int trip_count,
621 int passive_delay)
622{
623 int result;
624
625 if (trip_count)
626 tz->thermal_zone = thermal_zone_device_register_with_trips(
627 "acpitz", trip_table, trip_count, tz,
628 &acpi_thermal_zone_ops, NULL, passive_delay,
629 tz->polling_frequency * 100);
630 else
631 tz->thermal_zone = thermal_tripless_zone_device_register(
632 "acpitz", tz, &acpi_thermal_zone_ops, NULL);
633
634 if (IS_ERR(tz->thermal_zone))
635 return PTR_ERR(tz->thermal_zone);
636
637 result = acpi_thermal_zone_sysfs_add(tz);
638 if (result)
639 goto unregister_tzd;
640
641 result = thermal_zone_device_enable(tz->thermal_zone);
642 if (result)
643 goto remove_links;
644
645 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
646 thermal_zone_device_id(tz->thermal_zone));
647
648 return 0;
649
650remove_links:
651 acpi_thermal_zone_sysfs_remove(tz);
652unregister_tzd:
653 thermal_zone_device_unregister(tz->thermal_zone);
654
655 return result;
656}
657
658static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
659{
660 thermal_zone_device_disable(tz->thermal_zone);
661 acpi_thermal_zone_sysfs_remove(tz);
662 thermal_zone_device_unregister(tz->thermal_zone);
663 tz->thermal_zone = NULL;
664}
665
666
667/* --------------------------------------------------------------------------
668 Driver Interface
669 -------------------------------------------------------------------------- */
670
671static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
672{
673 struct acpi_device *device = data;
674 struct acpi_thermal *tz = acpi_driver_data(device);
675
676 if (!tz)
677 return;
678
679 switch (event) {
680 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
681 acpi_queue_thermal_check(tz);
682 break;
683 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
684 case ACPI_THERMAL_NOTIFY_DEVICES:
685 acpi_thermal_trips_update(tz, event);
686 break;
687 default:
688 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
689 event);
690 break;
691 }
692}
693
694/*
695 * On some platforms, the AML code has dependency about
696 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
697 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
698 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
699 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
700 * if _TMP has never been evaluated.
701 *
702 * As this dependency is totally transparent to OS, evaluate
703 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
704 * _TMP, before they are actually used.
705 */
706static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
707{
708 acpi_handle handle = tz->device->handle;
709 unsigned long long value;
710 int i;
711
712 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
713 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
714 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
715 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
716 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
717 acpi_status status;
718
719 status = acpi_evaluate_integer(handle, name, NULL, &value);
720 if (status == AE_NOT_FOUND)
721 break;
722 }
723 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
724}
725
726/*
727 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
728 * handles temperature values with a single decimal place. As a consequence,
729 * some implementations use an offset of 273.1 and others use an offset of
730 * 273.2. Try to find out which one is being used, to present the most
731 * accurate and visually appealing number.
732 *
733 * The heuristic below should work for all ACPI thermal zones which have a
734 * critical trip point with a value being a multiple of 0.5 degree Celsius.
735 */
736static void acpi_thermal_guess_offset(struct acpi_thermal *tz, long crit_temp)
737{
738 if (crit_temp != THERMAL_TEMP_INVALID && crit_temp % 5 == 1)
739 tz->kelvin_offset = 273100;
740 else
741 tz->kelvin_offset = 273200;
742}
743
744static void acpi_thermal_check_fn(struct work_struct *work)
745{
746 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
747 thermal_check_work);
748
749 /*
750 * In general, it is not sufficient to check the pending bit, because
751 * subsequent instances of this function may be queued after one of them
752 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
753 * one of them is running, though, because it may have done the actual
754 * check some time ago, so allow at least one of them to block on the
755 * mutex while another one is running the update.
756 */
757 if (!refcount_dec_not_one(&tz->thermal_check_count))
758 return;
759
760 mutex_lock(&tz->thermal_check_lock);
761
762 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
763
764 refcount_inc(&tz->thermal_check_count);
765
766 mutex_unlock(&tz->thermal_check_lock);
767}
768
769static void acpi_thermal_free_thermal_zone(struct acpi_thermal *tz)
770{
771 int i;
772
773 acpi_handle_list_free(&tz->trips.passive.trip.devices);
774 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
775 acpi_handle_list_free(&tz->trips.active[i].trip.devices);
776
777 kfree(tz);
778}
779
780static int acpi_thermal_add(struct acpi_device *device)
781{
782 struct thermal_trip trip_table[ACPI_THERMAL_MAX_NR_TRIPS] = { 0 };
783 struct acpi_thermal_trip *acpi_trip;
784 struct thermal_trip *trip;
785 struct acpi_thermal *tz;
786 int crit_temp, hot_temp;
787 int passive_delay = 0;
788 int result;
789 int i;
790
791 if (!device)
792 return -EINVAL;
793
794 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
795 if (!tz)
796 return -ENOMEM;
797
798 tz->device = device;
799 strscpy(tz->name, device->pnp.bus_id);
800 strscpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
801 strscpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
802 device->driver_data = tz;
803
804 acpi_thermal_aml_dependency_fix(tz);
805
806 /* Get trip points [_CRT, _PSV, etc.] (required). */
807 acpi_thermal_get_trip_points(tz);
808
809 crit_temp = acpi_thermal_get_critical_trip(tz);
810 hot_temp = acpi_thermal_get_hot_trip(tz);
811
812 /* Get temperature [_TMP] (required). */
813 result = acpi_thermal_get_temperature(tz);
814 if (result)
815 goto free_memory;
816
817 /* Set the cooling mode [_SCP] to active cooling. */
818 acpi_execute_simple_method(tz->device->handle, "_SCP",
819 ACPI_THERMAL_MODE_ACTIVE);
820
821 /* Determine the default polling frequency [_TZP]. */
822 if (tzp)
823 tz->polling_frequency = tzp;
824 else
825 acpi_thermal_get_polling_frequency(tz);
826
827 acpi_thermal_guess_offset(tz, crit_temp);
828
829 trip = trip_table;
830
831 if (crit_temp != THERMAL_TEMP_INVALID) {
832 trip->type = THERMAL_TRIP_CRITICAL;
833 trip->temperature = acpi_thermal_temp(tz, crit_temp);
834 trip++;
835 }
836
837 if (hot_temp != THERMAL_TEMP_INVALID) {
838 trip->type = THERMAL_TRIP_HOT;
839 trip->temperature = acpi_thermal_temp(tz, hot_temp);
840 trip++;
841 }
842
843 acpi_trip = &tz->trips.passive.trip;
844 if (acpi_thermal_trip_valid(acpi_trip)) {
845 passive_delay = tz->trips.passive.delay;
846
847 trip->type = THERMAL_TRIP_PASSIVE;
848 trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
849 trip->priv = acpi_trip;
850 trip++;
851 }
852
853 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
854 acpi_trip = &tz->trips.active[i].trip;
855
856 if (!acpi_thermal_trip_valid(acpi_trip))
857 break;
858
859 trip->type = THERMAL_TRIP_ACTIVE;
860 trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
861 trip->priv = acpi_trip;
862 trip++;
863 }
864
865 if (trip == trip_table)
866 pr_warn(FW_BUG "No valid trip points!\n");
867
868 result = acpi_thermal_register_thermal_zone(tz, trip_table,
869 trip - trip_table,
870 passive_delay);
871 if (result)
872 goto free_memory;
873
874 refcount_set(&tz->thermal_check_count, 3);
875 mutex_init(&tz->thermal_check_lock);
876 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
877
878 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
879 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temp_dk));
880
881 result = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
882 acpi_thermal_notify, device);
883 if (result)
884 goto flush_wq;
885
886 return 0;
887
888flush_wq:
889 flush_workqueue(acpi_thermal_pm_queue);
890 acpi_thermal_unregister_thermal_zone(tz);
891free_memory:
892 acpi_thermal_free_thermal_zone(tz);
893
894 return result;
895}
896
897static void acpi_thermal_remove(struct acpi_device *device)
898{
899 struct acpi_thermal *tz;
900
901 if (!device || !acpi_driver_data(device))
902 return;
903
904 tz = acpi_driver_data(device);
905
906 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
907 acpi_thermal_notify);
908
909 flush_workqueue(acpi_thermal_pm_queue);
910 acpi_thermal_unregister_thermal_zone(tz);
911 acpi_thermal_free_thermal_zone(tz);
912}
913
914#ifdef CONFIG_PM_SLEEP
915static int acpi_thermal_suspend(struct device *dev)
916{
917 /* Make sure the previously queued thermal check work has been done */
918 flush_workqueue(acpi_thermal_pm_queue);
919 return 0;
920}
921
922static int acpi_thermal_resume(struct device *dev)
923{
924 struct acpi_thermal *tz;
925 int i, j, power_state;
926
927 if (!dev)
928 return -EINVAL;
929
930 tz = acpi_driver_data(to_acpi_device(dev));
931 if (!tz)
932 return -EINVAL;
933
934 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
935 struct acpi_thermal_trip *acpi_trip = &tz->trips.active[i].trip;
936
937 if (!acpi_thermal_trip_valid(acpi_trip))
938 break;
939
940 for (j = 0; j < acpi_trip->devices.count; j++) {
941 acpi_bus_update_power(acpi_trip->devices.handles[j],
942 &power_state);
943 }
944 }
945
946 acpi_queue_thermal_check(tz);
947
948 return AE_OK;
949}
950#else
951#define acpi_thermal_suspend NULL
952#define acpi_thermal_resume NULL
953#endif
954static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
955
956static const struct acpi_device_id thermal_device_ids[] = {
957 {ACPI_THERMAL_HID, 0},
958 {"", 0},
959};
960MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
961
962static struct acpi_driver acpi_thermal_driver = {
963 .name = "thermal",
964 .class = ACPI_THERMAL_CLASS,
965 .ids = thermal_device_ids,
966 .ops = {
967 .add = acpi_thermal_add,
968 .remove = acpi_thermal_remove,
969 },
970 .drv.pm = &acpi_thermal_pm,
971};
972
973static int thermal_act(const struct dmi_system_id *d)
974{
975 if (act == 0) {
976 pr_notice("%s detected: disabling all active thermal trip points\n",
977 d->ident);
978 act = -1;
979 }
980 return 0;
981}
982
983static int thermal_nocrt(const struct dmi_system_id *d)
984{
985 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
986 d->ident);
987 crt = -1;
988 return 0;
989}
990
991static int thermal_tzp(const struct dmi_system_id *d)
992{
993 if (tzp == 0) {
994 pr_notice("%s detected: enabling thermal zone polling\n",
995 d->ident);
996 tzp = 300; /* 300 dS = 30 Seconds */
997 }
998 return 0;
999}
1000
1001static int thermal_psv(const struct dmi_system_id *d)
1002{
1003 if (psv == 0) {
1004 pr_notice("%s detected: disabling all passive thermal trip points\n",
1005 d->ident);
1006 psv = -1;
1007 }
1008 return 0;
1009}
1010
1011static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1012 /*
1013 * Award BIOS on this AOpen makes thermal control almost worthless.
1014 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1015 */
1016 {
1017 .callback = thermal_act,
1018 .ident = "AOpen i915GMm-HFS",
1019 .matches = {
1020 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1021 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1022 },
1023 },
1024 {
1025 .callback = thermal_psv,
1026 .ident = "AOpen i915GMm-HFS",
1027 .matches = {
1028 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1029 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1030 },
1031 },
1032 {
1033 .callback = thermal_tzp,
1034 .ident = "AOpen i915GMm-HFS",
1035 .matches = {
1036 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1037 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1038 },
1039 },
1040 {
1041 .callback = thermal_nocrt,
1042 .ident = "Gigabyte GA-7ZX",
1043 .matches = {
1044 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1045 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1046 },
1047 },
1048 {}
1049};
1050
1051static int __init acpi_thermal_init(void)
1052{
1053 int result;
1054
1055 dmi_check_system(thermal_dmi_table);
1056
1057 if (off) {
1058 pr_notice("thermal control disabled\n");
1059 return -ENODEV;
1060 }
1061
1062 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1063 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1064 if (!acpi_thermal_pm_queue)
1065 return -ENODEV;
1066
1067 result = acpi_bus_register_driver(&acpi_thermal_driver);
1068 if (result < 0) {
1069 destroy_workqueue(acpi_thermal_pm_queue);
1070 return -ENODEV;
1071 }
1072
1073 return 0;
1074}
1075
1076static void __exit acpi_thermal_exit(void)
1077{
1078 acpi_bus_unregister_driver(&acpi_thermal_driver);
1079 destroy_workqueue(acpi_thermal_pm_queue);
1080}
1081
1082module_init(acpi_thermal_init);
1083module_exit(acpi_thermal_exit);
1084
1085MODULE_IMPORT_NS("ACPI_THERMAL");
1086MODULE_AUTHOR("Paul Diefenbaugh");
1087MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
1088MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 *
8 * This driver fully implements the ACPI thermal policy as described in the
9 * ACPI 2.0 Specification.
10 *
11 * TBD: 1. Implement passive cooling hysteresis.
12 * 2. Enhance passive cooling (CPU) states/limit interface to support
13 * concepts of 'multiple limiters', upper/lower limits, etc.
14 */
15
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/dmi.h>
19#include <linux/init.h>
20#include <linux/slab.h>
21#include <linux/types.h>
22#include <linux/jiffies.h>
23#include <linux/kmod.h>
24#include <linux/reboot.h>
25#include <linux/device.h>
26#include <linux/thermal.h>
27#include <linux/acpi.h>
28#include <linux/workqueue.h>
29#include <linux/uaccess.h>
30
31#define PREFIX "ACPI: "
32
33#define ACPI_THERMAL_CLASS "thermal_zone"
34#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
35#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
36#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
37#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
38#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
39#define ACPI_THERMAL_NOTIFY_HOT 0xF1
40#define ACPI_THERMAL_MODE_ACTIVE 0x00
41
42#define ACPI_THERMAL_MAX_ACTIVE 10
43#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
44
45#define _COMPONENT ACPI_THERMAL_COMPONENT
46ACPI_MODULE_NAME("thermal");
47
48MODULE_AUTHOR("Paul Diefenbaugh");
49MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
50MODULE_LICENSE("GPL");
51
52static int act;
53module_param(act, int, 0644);
54MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
55
56static int crt;
57module_param(crt, int, 0644);
58MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
59
60static int tzp;
61module_param(tzp, int, 0444);
62MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
63
64static int nocrt;
65module_param(nocrt, int, 0);
66MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
67
68static int off;
69module_param(off, int, 0);
70MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
71
72static int psv;
73module_param(psv, int, 0644);
74MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
75
76static struct workqueue_struct *acpi_thermal_pm_queue;
77
78static int acpi_thermal_add(struct acpi_device *device);
79static int acpi_thermal_remove(struct acpi_device *device);
80static void acpi_thermal_notify(struct acpi_device *device, u32 event);
81
82static const struct acpi_device_id thermal_device_ids[] = {
83 {ACPI_THERMAL_HID, 0},
84 {"", 0},
85};
86MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
87
88#ifdef CONFIG_PM_SLEEP
89static int acpi_thermal_suspend(struct device *dev);
90static int acpi_thermal_resume(struct device *dev);
91#else
92#define acpi_thermal_suspend NULL
93#define acpi_thermal_resume NULL
94#endif
95static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
96
97static struct acpi_driver acpi_thermal_driver = {
98 .name = "thermal",
99 .class = ACPI_THERMAL_CLASS,
100 .ids = thermal_device_ids,
101 .ops = {
102 .add = acpi_thermal_add,
103 .remove = acpi_thermal_remove,
104 .notify = acpi_thermal_notify,
105 },
106 .drv.pm = &acpi_thermal_pm,
107};
108
109struct acpi_thermal_state {
110 u8 critical:1;
111 u8 hot:1;
112 u8 passive:1;
113 u8 active:1;
114 u8 reserved:4;
115 int active_index;
116};
117
118struct acpi_thermal_state_flags {
119 u8 valid:1;
120 u8 enabled:1;
121 u8 reserved:6;
122};
123
124struct acpi_thermal_critical {
125 struct acpi_thermal_state_flags flags;
126 unsigned long temperature;
127};
128
129struct acpi_thermal_hot {
130 struct acpi_thermal_state_flags flags;
131 unsigned long temperature;
132};
133
134struct acpi_thermal_passive {
135 struct acpi_thermal_state_flags flags;
136 unsigned long temperature;
137 unsigned long tc1;
138 unsigned long tc2;
139 unsigned long tsp;
140 struct acpi_handle_list devices;
141};
142
143struct acpi_thermal_active {
144 struct acpi_thermal_state_flags flags;
145 unsigned long temperature;
146 struct acpi_handle_list devices;
147};
148
149struct acpi_thermal_trips {
150 struct acpi_thermal_critical critical;
151 struct acpi_thermal_hot hot;
152 struct acpi_thermal_passive passive;
153 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
154};
155
156struct acpi_thermal_flags {
157 u8 cooling_mode:1; /* _SCP */
158 u8 devices:1; /* _TZD */
159 u8 reserved:6;
160};
161
162struct acpi_thermal {
163 struct acpi_device * device;
164 acpi_bus_id name;
165 unsigned long temperature;
166 unsigned long last_temperature;
167 unsigned long polling_frequency;
168 volatile u8 zombie;
169 struct acpi_thermal_flags flags;
170 struct acpi_thermal_state state;
171 struct acpi_thermal_trips trips;
172 struct acpi_handle_list devices;
173 struct thermal_zone_device *thermal_zone;
174 int tz_enabled;
175 int kelvin_offset;
176 struct work_struct thermal_check_work;
177};
178
179/* --------------------------------------------------------------------------
180 Thermal Zone Management
181 -------------------------------------------------------------------------- */
182
183static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
184{
185 acpi_status status = AE_OK;
186 unsigned long long tmp;
187
188 if (!tz)
189 return -EINVAL;
190
191 tz->last_temperature = tz->temperature;
192
193 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
194 if (ACPI_FAILURE(status))
195 return -ENODEV;
196
197 tz->temperature = tmp;
198 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "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_DEBUG_PRINT((ACPI_DB_INFO, "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, str) \
256do { \
257 if (flags != ACPI_TRIPS_INIT) \
258 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
259 "ACPI thermal trip point %s changed\n" \
260 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
261} while (0)
262
263static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
264{
265 acpi_status status = AE_OK;
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,
274 "_CRT", NULL, &tmp);
275 tz->trips.critical.temperature = tmp;
276 /*
277 * Treat freezing temperatures as invalid as well; some
278 * BIOSes return really low values and cause reboots at startup.
279 * Below zero (Celsius) values clearly aren't right for sure..
280 * ... so lets discard those as invalid.
281 */
282 if (ACPI_FAILURE(status)) {
283 tz->trips.critical.flags.valid = 0;
284 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
285 "No critical threshold\n"));
286 } else if (tmp <= 2732) {
287 pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
288 tmp);
289 tz->trips.critical.flags.valid = 0;
290 } else {
291 tz->trips.critical.flags.valid = 1;
292 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
293 "Found critical threshold [%lu]\n",
294 tz->trips.critical.temperature));
295 }
296 if (tz->trips.critical.flags.valid == 1) {
297 if (crt == -1) {
298 tz->trips.critical.flags.valid = 0;
299 } else if (crt > 0) {
300 unsigned long crt_k = CELSIUS_TO_DECI_KELVIN(crt);
301 /*
302 * Allow override critical threshold
303 */
304 if (crt_k > tz->trips.critical.temperature)
305 pr_warn(PREFIX "Critical threshold %d C\n",
306 crt);
307 tz->trips.critical.temperature = crt_k;
308 }
309 }
310 }
311
312 /* Critical Sleep (optional) */
313 if (flag & ACPI_TRIPS_HOT) {
314 status = acpi_evaluate_integer(tz->device->handle,
315 "_HOT", NULL, &tmp);
316 if (ACPI_FAILURE(status)) {
317 tz->trips.hot.flags.valid = 0;
318 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
319 "No hot threshold\n"));
320 } else {
321 tz->trips.hot.temperature = tmp;
322 tz->trips.hot.flags.valid = 1;
323 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
324 "Found hot threshold [%lu]\n",
325 tz->trips.hot.temperature));
326 }
327 }
328
329 /* Passive (optional) */
330 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
331 (flag == ACPI_TRIPS_INIT)) {
332 valid = tz->trips.passive.flags.valid;
333 if (psv == -1) {
334 status = AE_SUPPORT;
335 } else if (psv > 0) {
336 tmp = CELSIUS_TO_DECI_KELVIN(psv);
337 status = AE_OK;
338 } else {
339 status = acpi_evaluate_integer(tz->device->handle,
340 "_PSV", NULL, &tmp);
341 }
342
343 if (ACPI_FAILURE(status))
344 tz->trips.passive.flags.valid = 0;
345 else {
346 tz->trips.passive.temperature = tmp;
347 tz->trips.passive.flags.valid = 1;
348 if (flag == ACPI_TRIPS_INIT) {
349 status = acpi_evaluate_integer(
350 tz->device->handle, "_TC1",
351 NULL, &tmp);
352 if (ACPI_FAILURE(status))
353 tz->trips.passive.flags.valid = 0;
354 else
355 tz->trips.passive.tc1 = tmp;
356 status = acpi_evaluate_integer(
357 tz->device->handle, "_TC2",
358 NULL, &tmp);
359 if (ACPI_FAILURE(status))
360 tz->trips.passive.flags.valid = 0;
361 else
362 tz->trips.passive.tc2 = tmp;
363 status = acpi_evaluate_integer(
364 tz->device->handle, "_TSP",
365 NULL, &tmp);
366 if (ACPI_FAILURE(status))
367 tz->trips.passive.flags.valid = 0;
368 else
369 tz->trips.passive.tsp = tmp;
370 }
371 }
372 }
373 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
374 memset(&devices, 0, sizeof(struct acpi_handle_list));
375 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
376 NULL, &devices);
377 if (ACPI_FAILURE(status)) {
378 pr_warn(PREFIX "Invalid passive threshold\n");
379 tz->trips.passive.flags.valid = 0;
380 }
381 else
382 tz->trips.passive.flags.valid = 1;
383
384 if (memcmp(&tz->trips.passive.devices, &devices,
385 sizeof(struct acpi_handle_list))) {
386 memcpy(&tz->trips.passive.devices, &devices,
387 sizeof(struct acpi_handle_list));
388 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
389 }
390 }
391 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
392 if (valid != tz->trips.passive.flags.valid)
393 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
394 }
395
396 /* Active (optional) */
397 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
398 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
399 valid = tz->trips.active[i].flags.valid;
400
401 if (act == -1)
402 break; /* disable all active trip points */
403
404 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
405 tz->trips.active[i].flags.valid)) {
406 status = acpi_evaluate_integer(tz->device->handle,
407 name, NULL, &tmp);
408 if (ACPI_FAILURE(status)) {
409 tz->trips.active[i].flags.valid = 0;
410 if (i == 0)
411 break;
412 if (act <= 0)
413 break;
414 if (i == 1)
415 tz->trips.active[0].temperature =
416 CELSIUS_TO_DECI_KELVIN(act);
417 else
418 /*
419 * Don't allow override higher than
420 * the next higher trip point
421 */
422 tz->trips.active[i - 1].temperature =
423 (tz->trips.active[i - 2].temperature <
424 CELSIUS_TO_DECI_KELVIN(act) ?
425 tz->trips.active[i - 2].temperature :
426 CELSIUS_TO_DECI_KELVIN(act));
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 pr_warn(PREFIX "Invalid active%d threshold\n",
441 i);
442 tz->trips.active[i].flags.valid = 0;
443 }
444 else
445 tz->trips.active[i].flags.valid = 1;
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, "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, "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, "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
497static void acpi_thermal_check(void *data)
498{
499 struct acpi_thermal *tz = data;
500
501 if (!tz->tz_enabled)
502 return;
503
504 thermal_zone_device_update(tz->thermal_zone,
505 THERMAL_EVENT_UNSPECIFIED);
506}
507
508/* sys I/F for generic thermal sysfs support */
509
510static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
511{
512 struct acpi_thermal *tz = thermal->devdata;
513 int result;
514
515 if (!tz)
516 return -EINVAL;
517
518 result = acpi_thermal_get_temperature(tz);
519 if (result)
520 return result;
521
522 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(tz->temperature,
523 tz->kelvin_offset);
524 return 0;
525}
526
527static int thermal_get_mode(struct thermal_zone_device *thermal,
528 enum thermal_device_mode *mode)
529{
530 struct acpi_thermal *tz = thermal->devdata;
531
532 if (!tz)
533 return -EINVAL;
534
535 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
536 THERMAL_DEVICE_DISABLED;
537
538 return 0;
539}
540
541static int thermal_set_mode(struct thermal_zone_device *thermal,
542 enum thermal_device_mode mode)
543{
544 struct acpi_thermal *tz = thermal->devdata;
545 int enable;
546
547 if (!tz)
548 return -EINVAL;
549
550 /*
551 * enable/disable thermal management from ACPI thermal driver
552 */
553 if (mode == THERMAL_DEVICE_ENABLED)
554 enable = 1;
555 else if (mode == THERMAL_DEVICE_DISABLED) {
556 enable = 0;
557 pr_warn("thermal zone will be disabled\n");
558 } else
559 return -EINVAL;
560
561 if (enable != tz->tz_enabled) {
562 tz->tz_enabled = enable;
563 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
564 "%s kernel ACPI thermal control\n",
565 tz->tz_enabled ? "Enable" : "Disable"));
566 acpi_thermal_check(tz);
567 }
568 return 0;
569}
570
571static int thermal_get_trip_type(struct thermal_zone_device *thermal,
572 int trip, enum thermal_trip_type *type)
573{
574 struct acpi_thermal *tz = thermal->devdata;
575 int i;
576
577 if (!tz || trip < 0)
578 return -EINVAL;
579
580 if (tz->trips.critical.flags.valid) {
581 if (!trip) {
582 *type = THERMAL_TRIP_CRITICAL;
583 return 0;
584 }
585 trip--;
586 }
587
588 if (tz->trips.hot.flags.valid) {
589 if (!trip) {
590 *type = THERMAL_TRIP_HOT;
591 return 0;
592 }
593 trip--;
594 }
595
596 if (tz->trips.passive.flags.valid) {
597 if (!trip) {
598 *type = THERMAL_TRIP_PASSIVE;
599 return 0;
600 }
601 trip--;
602 }
603
604 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
605 tz->trips.active[i].flags.valid; i++) {
606 if (!trip) {
607 *type = THERMAL_TRIP_ACTIVE;
608 return 0;
609 }
610 trip--;
611 }
612
613 return -EINVAL;
614}
615
616static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
617 int trip, int *temp)
618{
619 struct acpi_thermal *tz = thermal->devdata;
620 int i;
621
622 if (!tz || trip < 0)
623 return -EINVAL;
624
625 if (tz->trips.critical.flags.valid) {
626 if (!trip) {
627 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
628 tz->trips.critical.temperature,
629 tz->kelvin_offset);
630 return 0;
631 }
632 trip--;
633 }
634
635 if (tz->trips.hot.flags.valid) {
636 if (!trip) {
637 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
638 tz->trips.hot.temperature,
639 tz->kelvin_offset);
640 return 0;
641 }
642 trip--;
643 }
644
645 if (tz->trips.passive.flags.valid) {
646 if (!trip) {
647 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
648 tz->trips.passive.temperature,
649 tz->kelvin_offset);
650 return 0;
651 }
652 trip--;
653 }
654
655 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
656 tz->trips.active[i].flags.valid; i++) {
657 if (!trip) {
658 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
659 tz->trips.active[i].temperature,
660 tz->kelvin_offset);
661 return 0;
662 }
663 trip--;
664 }
665
666 return -EINVAL;
667}
668
669static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
670 int *temperature)
671{
672 struct acpi_thermal *tz = thermal->devdata;
673
674 if (tz->trips.critical.flags.valid) {
675 *temperature = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
676 tz->trips.critical.temperature,
677 tz->kelvin_offset);
678 return 0;
679 } else
680 return -EINVAL;
681}
682
683static int thermal_get_trend(struct thermal_zone_device *thermal,
684 int trip, enum thermal_trend *trend)
685{
686 struct acpi_thermal *tz = thermal->devdata;
687 enum thermal_trip_type type;
688 int i;
689
690 if (thermal_get_trip_type(thermal, trip, &type))
691 return -EINVAL;
692
693 if (type == THERMAL_TRIP_ACTIVE) {
694 int trip_temp;
695 int temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
696 tz->temperature, tz->kelvin_offset);
697 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
698 return -EINVAL;
699
700 if (temp > trip_temp) {
701 *trend = THERMAL_TREND_RAISING;
702 return 0;
703 } else {
704 /* Fall back on default trend */
705 return -EINVAL;
706 }
707 }
708
709 /*
710 * tz->temperature has already been updated by generic thermal layer,
711 * before this callback being invoked
712 */
713 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
714 + (tz->trips.passive.tc2
715 * (tz->temperature - tz->trips.passive.temperature));
716
717 if (i > 0)
718 *trend = THERMAL_TREND_RAISING;
719 else if (i < 0)
720 *trend = THERMAL_TREND_DROPPING;
721 else
722 *trend = THERMAL_TREND_STABLE;
723 return 0;
724}
725
726
727static int thermal_notify(struct thermal_zone_device *thermal, int trip,
728 enum thermal_trip_type trip_type)
729{
730 u8 type = 0;
731 struct acpi_thermal *tz = thermal->devdata;
732
733 if (trip_type == THERMAL_TRIP_CRITICAL)
734 type = ACPI_THERMAL_NOTIFY_CRITICAL;
735 else if (trip_type == THERMAL_TRIP_HOT)
736 type = ACPI_THERMAL_NOTIFY_HOT;
737 else
738 return 0;
739
740 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
741 dev_name(&tz->device->dev), type, 1);
742
743 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
744 return 1;
745
746 return 0;
747}
748
749static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
750 struct thermal_cooling_device *cdev,
751 bool bind)
752{
753 struct acpi_device *device = cdev->devdata;
754 struct acpi_thermal *tz = thermal->devdata;
755 struct acpi_device *dev;
756 acpi_status status;
757 acpi_handle handle;
758 int i;
759 int j;
760 int trip = -1;
761 int result = 0;
762
763 if (tz->trips.critical.flags.valid)
764 trip++;
765
766 if (tz->trips.hot.flags.valid)
767 trip++;
768
769 if (tz->trips.passive.flags.valid) {
770 trip++;
771 for (i = 0; i < tz->trips.passive.devices.count;
772 i++) {
773 handle = tz->trips.passive.devices.handles[i];
774 status = acpi_bus_get_device(handle, &dev);
775 if (ACPI_FAILURE(status) || dev != device)
776 continue;
777 if (bind)
778 result =
779 thermal_zone_bind_cooling_device
780 (thermal, trip, cdev,
781 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
782 THERMAL_WEIGHT_DEFAULT);
783 else
784 result =
785 thermal_zone_unbind_cooling_device
786 (thermal, trip, cdev);
787 if (result)
788 goto failed;
789 }
790 }
791
792 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
793 if (!tz->trips.active[i].flags.valid)
794 break;
795 trip++;
796 for (j = 0;
797 j < tz->trips.active[i].devices.count;
798 j++) {
799 handle = tz->trips.active[i].devices.handles[j];
800 status = acpi_bus_get_device(handle, &dev);
801 if (ACPI_FAILURE(status) || dev != device)
802 continue;
803 if (bind)
804 result = thermal_zone_bind_cooling_device
805 (thermal, trip, cdev,
806 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
807 THERMAL_WEIGHT_DEFAULT);
808 else
809 result = thermal_zone_unbind_cooling_device
810 (thermal, trip, cdev);
811 if (result)
812 goto failed;
813 }
814 }
815
816 for (i = 0; i < tz->devices.count; i++) {
817 handle = tz->devices.handles[i];
818 status = acpi_bus_get_device(handle, &dev);
819 if (ACPI_SUCCESS(status) && (dev == device)) {
820 if (bind)
821 result = thermal_zone_bind_cooling_device
822 (thermal, THERMAL_TRIPS_NONE,
823 cdev, THERMAL_NO_LIMIT,
824 THERMAL_NO_LIMIT,
825 THERMAL_WEIGHT_DEFAULT);
826 else
827 result = thermal_zone_unbind_cooling_device
828 (thermal, THERMAL_TRIPS_NONE,
829 cdev);
830 if (result)
831 goto failed;
832 }
833 }
834
835failed:
836 return result;
837}
838
839static int
840acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
841 struct thermal_cooling_device *cdev)
842{
843 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
844}
845
846static int
847acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
848 struct thermal_cooling_device *cdev)
849{
850 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
851}
852
853static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
854 .bind = acpi_thermal_bind_cooling_device,
855 .unbind = acpi_thermal_unbind_cooling_device,
856 .get_temp = thermal_get_temp,
857 .get_mode = thermal_get_mode,
858 .set_mode = thermal_set_mode,
859 .get_trip_type = thermal_get_trip_type,
860 .get_trip_temp = thermal_get_trip_temp,
861 .get_crit_temp = thermal_get_crit_temp,
862 .get_trend = thermal_get_trend,
863 .notify = thermal_notify,
864};
865
866static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
867{
868 int trips = 0;
869 int result;
870 acpi_status status;
871 int i;
872
873 if (tz->trips.critical.flags.valid)
874 trips++;
875
876 if (tz->trips.hot.flags.valid)
877 trips++;
878
879 if (tz->trips.passive.flags.valid)
880 trips++;
881
882 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
883 tz->trips.active[i].flags.valid; i++, trips++);
884
885 if (tz->trips.passive.flags.valid)
886 tz->thermal_zone =
887 thermal_zone_device_register("acpitz", trips, 0, tz,
888 &acpi_thermal_zone_ops, NULL,
889 tz->trips.passive.tsp*100,
890 tz->polling_frequency*100);
891 else
892 tz->thermal_zone =
893 thermal_zone_device_register("acpitz", trips, 0, tz,
894 &acpi_thermal_zone_ops, NULL,
895 0, tz->polling_frequency*100);
896 if (IS_ERR(tz->thermal_zone))
897 return -ENODEV;
898
899 result = sysfs_create_link(&tz->device->dev.kobj,
900 &tz->thermal_zone->device.kobj, "thermal_zone");
901 if (result)
902 return result;
903
904 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
905 &tz->device->dev.kobj, "device");
906 if (result)
907 return result;
908
909 status = acpi_bus_attach_private_data(tz->device->handle,
910 tz->thermal_zone);
911 if (ACPI_FAILURE(status))
912 return -ENODEV;
913
914 tz->tz_enabled = 1;
915
916 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
917 tz->thermal_zone->id);
918 return 0;
919}
920
921static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
922{
923 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
924 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
925 thermal_zone_device_unregister(tz->thermal_zone);
926 tz->thermal_zone = NULL;
927 acpi_bus_detach_private_data(tz->device->handle);
928}
929
930
931/* --------------------------------------------------------------------------
932 Driver Interface
933 -------------------------------------------------------------------------- */
934
935static void acpi_thermal_notify(struct acpi_device *device, u32 event)
936{
937 struct acpi_thermal *tz = acpi_driver_data(device);
938
939
940 if (!tz)
941 return;
942
943 switch (event) {
944 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
945 acpi_thermal_check(tz);
946 break;
947 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
948 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
949 acpi_thermal_check(tz);
950 acpi_bus_generate_netlink_event(device->pnp.device_class,
951 dev_name(&device->dev), event, 0);
952 break;
953 case ACPI_THERMAL_NOTIFY_DEVICES:
954 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
955 acpi_thermal_check(tz);
956 acpi_bus_generate_netlink_event(device->pnp.device_class,
957 dev_name(&device->dev), event, 0);
958 break;
959 default:
960 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
961 "Unsupported event [0x%x]\n", event));
962 break;
963 }
964}
965
966/*
967 * On some platforms, the AML code has dependency about
968 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
969 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
970 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
971 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
972 * if _TMP has never been evaluated.
973 *
974 * As this dependency is totally transparent to OS, evaluate
975 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
976 * _TMP, before they are actually used.
977 */
978static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
979{
980 acpi_handle handle = tz->device->handle;
981 unsigned long long value;
982 int i;
983
984 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
985 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
986 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
987 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
988 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
989 acpi_status status;
990
991 status = acpi_evaluate_integer(handle, name, NULL, &value);
992 if (status == AE_NOT_FOUND)
993 break;
994 }
995 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
996}
997
998static int acpi_thermal_get_info(struct acpi_thermal *tz)
999{
1000 int result = 0;
1001
1002
1003 if (!tz)
1004 return -EINVAL;
1005
1006 acpi_thermal_aml_dependency_fix(tz);
1007
1008 /* Get trip points [_CRT, _PSV, etc.] (required) */
1009 result = acpi_thermal_get_trip_points(tz);
1010 if (result)
1011 return result;
1012
1013 /* Get temperature [_TMP] (required) */
1014 result = acpi_thermal_get_temperature(tz);
1015 if (result)
1016 return result;
1017
1018 /* Set the cooling mode [_SCP] to active cooling (default) */
1019 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1020 if (!result)
1021 tz->flags.cooling_mode = 1;
1022
1023 /* Get default polling frequency [_TZP] (optional) */
1024 if (tzp)
1025 tz->polling_frequency = tzp;
1026 else
1027 acpi_thermal_get_polling_frequency(tz);
1028
1029 return 0;
1030}
1031
1032/*
1033 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1034 * handles temperature values with a single decimal place. As a consequence,
1035 * some implementations use an offset of 273.1 and others use an offset of
1036 * 273.2. Try to find out which one is being used, to present the most
1037 * accurate and visually appealing number.
1038 *
1039 * The heuristic below should work for all ACPI thermal zones which have a
1040 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1041 */
1042static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1043{
1044 if (tz->trips.critical.flags.valid &&
1045 (tz->trips.critical.temperature % 5) == 1)
1046 tz->kelvin_offset = 2731;
1047 else
1048 tz->kelvin_offset = 2732;
1049}
1050
1051static void acpi_thermal_check_fn(struct work_struct *work)
1052{
1053 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1054 thermal_check_work);
1055 acpi_thermal_check(tz);
1056}
1057
1058static int acpi_thermal_add(struct acpi_device *device)
1059{
1060 int result = 0;
1061 struct acpi_thermal *tz = NULL;
1062
1063
1064 if (!device)
1065 return -EINVAL;
1066
1067 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1068 if (!tz)
1069 return -ENOMEM;
1070
1071 tz->device = device;
1072 strcpy(tz->name, device->pnp.bus_id);
1073 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1074 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1075 device->driver_data = tz;
1076
1077 result = acpi_thermal_get_info(tz);
1078 if (result)
1079 goto free_memory;
1080
1081 acpi_thermal_guess_offset(tz);
1082
1083 result = acpi_thermal_register_thermal_zone(tz);
1084 if (result)
1085 goto free_memory;
1086
1087 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1088
1089 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1090 acpi_device_bid(device), DECI_KELVIN_TO_CELSIUS(tz->temperature));
1091 goto end;
1092
1093free_memory:
1094 kfree(tz);
1095end:
1096 return result;
1097}
1098
1099static int acpi_thermal_remove(struct acpi_device *device)
1100{
1101 struct acpi_thermal *tz = NULL;
1102
1103 if (!device || !acpi_driver_data(device))
1104 return -EINVAL;
1105
1106 flush_workqueue(acpi_thermal_pm_queue);
1107 tz = acpi_driver_data(device);
1108
1109 acpi_thermal_unregister_thermal_zone(tz);
1110 kfree(tz);
1111 return 0;
1112}
1113
1114#ifdef CONFIG_PM_SLEEP
1115static int acpi_thermal_suspend(struct device *dev)
1116{
1117 /* Make sure the previously queued thermal check work has been done */
1118 flush_workqueue(acpi_thermal_pm_queue);
1119 return 0;
1120}
1121
1122static int acpi_thermal_resume(struct device *dev)
1123{
1124 struct acpi_thermal *tz;
1125 int i, j, power_state, result;
1126
1127 if (!dev)
1128 return -EINVAL;
1129
1130 tz = acpi_driver_data(to_acpi_device(dev));
1131 if (!tz)
1132 return -EINVAL;
1133
1134 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1135 if (!(&tz->trips.active[i]))
1136 break;
1137 if (!tz->trips.active[i].flags.valid)
1138 break;
1139 tz->trips.active[i].flags.enabled = 1;
1140 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1141 result = acpi_bus_update_power(
1142 tz->trips.active[i].devices.handles[j],
1143 &power_state);
1144 if (result || (power_state != ACPI_STATE_D0)) {
1145 tz->trips.active[i].flags.enabled = 0;
1146 break;
1147 }
1148 }
1149 tz->state.active |= tz->trips.active[i].flags.enabled;
1150 }
1151
1152 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1153
1154 return AE_OK;
1155}
1156#endif
1157
1158static int thermal_act(const struct dmi_system_id *d) {
1159
1160 if (act == 0) {
1161 pr_notice(PREFIX "%s detected: "
1162 "disabling all active thermal trip points\n", d->ident);
1163 act = -1;
1164 }
1165 return 0;
1166}
1167static int thermal_nocrt(const struct dmi_system_id *d) {
1168
1169 pr_notice(PREFIX "%s detected: "
1170 "disabling all critical thermal trip point actions.\n", d->ident);
1171 nocrt = 1;
1172 return 0;
1173}
1174static int thermal_tzp(const struct dmi_system_id *d) {
1175
1176 if (tzp == 0) {
1177 pr_notice(PREFIX "%s detected: "
1178 "enabling thermal zone polling\n", d->ident);
1179 tzp = 300; /* 300 dS = 30 Seconds */
1180 }
1181 return 0;
1182}
1183static int thermal_psv(const struct dmi_system_id *d) {
1184
1185 if (psv == 0) {
1186 pr_notice(PREFIX "%s detected: "
1187 "disabling all passive thermal trip points\n", d->ident);
1188 psv = -1;
1189 }
1190 return 0;
1191}
1192
1193static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1194 /*
1195 * Award BIOS on this AOpen makes thermal control almost worthless.
1196 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1197 */
1198 {
1199 .callback = thermal_act,
1200 .ident = "AOpen i915GMm-HFS",
1201 .matches = {
1202 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1203 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1204 },
1205 },
1206 {
1207 .callback = thermal_psv,
1208 .ident = "AOpen i915GMm-HFS",
1209 .matches = {
1210 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1211 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1212 },
1213 },
1214 {
1215 .callback = thermal_tzp,
1216 .ident = "AOpen i915GMm-HFS",
1217 .matches = {
1218 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1219 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1220 },
1221 },
1222 {
1223 .callback = thermal_nocrt,
1224 .ident = "Gigabyte GA-7ZX",
1225 .matches = {
1226 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1227 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1228 },
1229 },
1230 {}
1231};
1232
1233static int __init acpi_thermal_init(void)
1234{
1235 int result = 0;
1236
1237 dmi_check_system(thermal_dmi_table);
1238
1239 if (off) {
1240 pr_notice(PREFIX "thermal control disabled\n");
1241 return -ENODEV;
1242 }
1243
1244 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1245 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1246 if (!acpi_thermal_pm_queue)
1247 return -ENODEV;
1248
1249 result = acpi_bus_register_driver(&acpi_thermal_driver);
1250 if (result < 0) {
1251 destroy_workqueue(acpi_thermal_pm_queue);
1252 return -ENODEV;
1253 }
1254
1255 return 0;
1256}
1257
1258static void __exit acpi_thermal_exit(void)
1259{
1260 acpi_bus_unregister_driver(&acpi_thermal_driver);
1261 destroy_workqueue(acpi_thermal_pm_queue);
1262
1263 return;
1264}
1265
1266module_init(acpi_thermal_init);
1267module_exit(acpi_thermal_exit);