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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#include <linux/units.h>
31
32#define PREFIX "ACPI: "
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
46#define _COMPONENT ACPI_THERMAL_COMPONENT
47ACPI_MODULE_NAME("thermal");
48
49MODULE_AUTHOR("Paul Diefenbaugh");
50MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
51MODULE_LICENSE("GPL");
52
53static int act;
54module_param(act, int, 0644);
55MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
56
57static int crt;
58module_param(crt, int, 0644);
59MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
60
61static int tzp;
62module_param(tzp, int, 0444);
63MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
64
65static int nocrt;
66module_param(nocrt, int, 0);
67MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
68
69static int off;
70module_param(off, int, 0);
71MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
72
73static int psv;
74module_param(psv, int, 0644);
75MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
76
77static struct workqueue_struct *acpi_thermal_pm_queue;
78
79static int acpi_thermal_add(struct acpi_device *device);
80static int acpi_thermal_remove(struct acpi_device *device);
81static void acpi_thermal_notify(struct acpi_device *device, u32 event);
82
83static const struct acpi_device_id thermal_device_ids[] = {
84 {ACPI_THERMAL_HID, 0},
85 {"", 0},
86};
87MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
88
89#ifdef CONFIG_PM_SLEEP
90static int acpi_thermal_suspend(struct device *dev);
91static int acpi_thermal_resume(struct device *dev);
92#else
93#define acpi_thermal_suspend NULL
94#define acpi_thermal_resume NULL
95#endif
96static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
97
98static struct acpi_driver acpi_thermal_driver = {
99 .name = "thermal",
100 .class = ACPI_THERMAL_CLASS,
101 .ids = thermal_device_ids,
102 .ops = {
103 .add = acpi_thermal_add,
104 .remove = acpi_thermal_remove,
105 .notify = acpi_thermal_notify,
106 },
107 .drv.pm = &acpi_thermal_pm,
108};
109
110struct acpi_thermal_state {
111 u8 critical:1;
112 u8 hot:1;
113 u8 passive:1;
114 u8 active:1;
115 u8 reserved:4;
116 int active_index;
117};
118
119struct acpi_thermal_state_flags {
120 u8 valid:1;
121 u8 enabled:1;
122 u8 reserved:6;
123};
124
125struct acpi_thermal_critical {
126 struct acpi_thermal_state_flags flags;
127 unsigned long temperature;
128};
129
130struct acpi_thermal_hot {
131 struct acpi_thermal_state_flags flags;
132 unsigned long temperature;
133};
134
135struct acpi_thermal_passive {
136 struct acpi_thermal_state_flags flags;
137 unsigned long temperature;
138 unsigned long tc1;
139 unsigned long tc2;
140 unsigned long tsp;
141 struct acpi_handle_list devices;
142};
143
144struct acpi_thermal_active {
145 struct acpi_thermal_state_flags flags;
146 unsigned long temperature;
147 struct acpi_handle_list devices;
148};
149
150struct acpi_thermal_trips {
151 struct acpi_thermal_critical critical;
152 struct acpi_thermal_hot hot;
153 struct acpi_thermal_passive passive;
154 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
155};
156
157struct acpi_thermal_flags {
158 u8 cooling_mode:1; /* _SCP */
159 u8 devices:1; /* _TZD */
160 u8 reserved:6;
161};
162
163struct acpi_thermal {
164 struct acpi_device * device;
165 acpi_bus_id name;
166 unsigned long temperature;
167 unsigned long last_temperature;
168 unsigned long polling_frequency;
169 volatile u8 zombie;
170 struct acpi_thermal_flags flags;
171 struct acpi_thermal_state state;
172 struct acpi_thermal_trips trips;
173 struct acpi_handle_list devices;
174 struct thermal_zone_device *thermal_zone;
175 int kelvin_offset; /* in millidegrees */
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 /*
303 * Allow override critical threshold
304 */
305 if (crt_k > tz->trips.critical.temperature)
306 pr_warn(PREFIX "Critical threshold %d C\n",
307 crt);
308 tz->trips.critical.temperature = crt_k;
309 }
310 }
311 }
312
313 /* Critical Sleep (optional) */
314 if (flag & ACPI_TRIPS_HOT) {
315 status = acpi_evaluate_integer(tz->device->handle,
316 "_HOT", NULL, &tmp);
317 if (ACPI_FAILURE(status)) {
318 tz->trips.hot.flags.valid = 0;
319 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
320 "No hot threshold\n"));
321 } else {
322 tz->trips.hot.temperature = tmp;
323 tz->trips.hot.flags.valid = 1;
324 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
325 "Found hot threshold [%lu]\n",
326 tz->trips.hot.temperature));
327 }
328 }
329
330 /* Passive (optional) */
331 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
332 (flag == ACPI_TRIPS_INIT)) {
333 valid = tz->trips.passive.flags.valid;
334 if (psv == -1) {
335 status = AE_SUPPORT;
336 } else if (psv > 0) {
337 tmp = celsius_to_deci_kelvin(psv);
338 status = AE_OK;
339 } else {
340 status = acpi_evaluate_integer(tz->device->handle,
341 "_PSV", NULL, &tmp);
342 }
343
344 if (ACPI_FAILURE(status))
345 tz->trips.passive.flags.valid = 0;
346 else {
347 tz->trips.passive.temperature = tmp;
348 tz->trips.passive.flags.valid = 1;
349 if (flag == ACPI_TRIPS_INIT) {
350 status = acpi_evaluate_integer(
351 tz->device->handle, "_TC1",
352 NULL, &tmp);
353 if (ACPI_FAILURE(status))
354 tz->trips.passive.flags.valid = 0;
355 else
356 tz->trips.passive.tc1 = tmp;
357 status = acpi_evaluate_integer(
358 tz->device->handle, "_TC2",
359 NULL, &tmp);
360 if (ACPI_FAILURE(status))
361 tz->trips.passive.flags.valid = 0;
362 else
363 tz->trips.passive.tc2 = tmp;
364 status = acpi_evaluate_integer(
365 tz->device->handle, "_TSP",
366 NULL, &tmp);
367 if (ACPI_FAILURE(status))
368 tz->trips.passive.flags.valid = 0;
369 else
370 tz->trips.passive.tsp = tmp;
371 }
372 }
373 }
374 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
375 memset(&devices, 0, sizeof(struct acpi_handle_list));
376 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
377 NULL, &devices);
378 if (ACPI_FAILURE(status)) {
379 pr_warn(PREFIX "Invalid passive threshold\n");
380 tz->trips.passive.flags.valid = 0;
381 }
382 else
383 tz->trips.passive.flags.valid = 1;
384
385 if (memcmp(&tz->trips.passive.devices, &devices,
386 sizeof(struct acpi_handle_list))) {
387 memcpy(&tz->trips.passive.devices, &devices,
388 sizeof(struct acpi_handle_list));
389 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
390 }
391 }
392 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
393 if (valid != tz->trips.passive.flags.valid)
394 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
395 }
396
397 /* Active (optional) */
398 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
399 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
400 valid = tz->trips.active[i].flags.valid;
401
402 if (act == -1)
403 break; /* disable all active trip points */
404
405 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
406 tz->trips.active[i].flags.valid)) {
407 status = acpi_evaluate_integer(tz->device->handle,
408 name, NULL, &tmp);
409 if (ACPI_FAILURE(status)) {
410 tz->trips.active[i].flags.valid = 0;
411 if (i == 0)
412 break;
413 if (act <= 0)
414 break;
415 if (i == 1)
416 tz->trips.active[0].temperature =
417 celsius_to_deci_kelvin(act);
418 else
419 /*
420 * Don't allow override higher than
421 * the next higher trip point
422 */
423 tz->trips.active[i - 1].temperature =
424 (tz->trips.active[i - 2].temperature <
425 celsius_to_deci_kelvin(act) ?
426 tz->trips.active[i - 2].temperature :
427 celsius_to_deci_kelvin(act));
428 break;
429 } else {
430 tz->trips.active[i].temperature = tmp;
431 tz->trips.active[i].flags.valid = 1;
432 }
433 }
434
435 name[2] = 'L';
436 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
437 memset(&devices, 0, sizeof(struct acpi_handle_list));
438 status = acpi_evaluate_reference(tz->device->handle,
439 name, NULL, &devices);
440 if (ACPI_FAILURE(status)) {
441 pr_warn(PREFIX "Invalid active%d threshold\n",
442 i);
443 tz->trips.active[i].flags.valid = 0;
444 }
445 else
446 tz->trips.active[i].flags.valid = 1;
447
448 if (memcmp(&tz->trips.active[i].devices, &devices,
449 sizeof(struct acpi_handle_list))) {
450 memcpy(&tz->trips.active[i].devices, &devices,
451 sizeof(struct acpi_handle_list));
452 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
453 }
454 }
455 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
456 if (valid != tz->trips.active[i].flags.valid)
457 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
458
459 if (!tz->trips.active[i].flags.valid)
460 break;
461 }
462
463 if (flag & ACPI_TRIPS_DEVICES) {
464 memset(&devices, 0, sizeof(devices));
465 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
466 NULL, &devices);
467 if (ACPI_SUCCESS(status)
468 && memcmp(&tz->devices, &devices, sizeof(devices))) {
469 tz->devices = devices;
470 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
471 }
472 }
473
474 return 0;
475}
476
477static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
478{
479 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
480
481 if (ret)
482 return ret;
483
484 valid = tz->trips.critical.flags.valid |
485 tz->trips.hot.flags.valid |
486 tz->trips.passive.flags.valid;
487
488 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
489 valid |= tz->trips.active[i].flags.valid;
490
491 if (!valid) {
492 pr_warn(FW_BUG "No valid trip found\n");
493 return -ENODEV;
494 }
495 return 0;
496}
497
498static void acpi_thermal_check(void *data)
499{
500 struct acpi_thermal *tz = data;
501
502 thermal_zone_device_update(tz->thermal_zone,
503 THERMAL_EVENT_UNSPECIFIED);
504}
505
506/* sys I/F for generic thermal sysfs support */
507
508static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
509{
510 struct acpi_thermal *tz = thermal->devdata;
511 int result;
512
513 if (!tz)
514 return -EINVAL;
515
516 result = acpi_thermal_get_temperature(tz);
517 if (result)
518 return result;
519
520 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature,
521 tz->kelvin_offset);
522 return 0;
523}
524
525static int thermal_get_trip_type(struct thermal_zone_device *thermal,
526 int trip, enum thermal_trip_type *type)
527{
528 struct acpi_thermal *tz = thermal->devdata;
529 int i;
530
531 if (!tz || trip < 0)
532 return -EINVAL;
533
534 if (tz->trips.critical.flags.valid) {
535 if (!trip) {
536 *type = THERMAL_TRIP_CRITICAL;
537 return 0;
538 }
539 trip--;
540 }
541
542 if (tz->trips.hot.flags.valid) {
543 if (!trip) {
544 *type = THERMAL_TRIP_HOT;
545 return 0;
546 }
547 trip--;
548 }
549
550 if (tz->trips.passive.flags.valid) {
551 if (!trip) {
552 *type = THERMAL_TRIP_PASSIVE;
553 return 0;
554 }
555 trip--;
556 }
557
558 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
559 tz->trips.active[i].flags.valid; i++) {
560 if (!trip) {
561 *type = THERMAL_TRIP_ACTIVE;
562 return 0;
563 }
564 trip--;
565 }
566
567 return -EINVAL;
568}
569
570static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
571 int trip, int *temp)
572{
573 struct acpi_thermal *tz = thermal->devdata;
574 int i;
575
576 if (!tz || trip < 0)
577 return -EINVAL;
578
579 if (tz->trips.critical.flags.valid) {
580 if (!trip) {
581 *temp = deci_kelvin_to_millicelsius_with_offset(
582 tz->trips.critical.temperature,
583 tz->kelvin_offset);
584 return 0;
585 }
586 trip--;
587 }
588
589 if (tz->trips.hot.flags.valid) {
590 if (!trip) {
591 *temp = deci_kelvin_to_millicelsius_with_offset(
592 tz->trips.hot.temperature,
593 tz->kelvin_offset);
594 return 0;
595 }
596 trip--;
597 }
598
599 if (tz->trips.passive.flags.valid) {
600 if (!trip) {
601 *temp = deci_kelvin_to_millicelsius_with_offset(
602 tz->trips.passive.temperature,
603 tz->kelvin_offset);
604 return 0;
605 }
606 trip--;
607 }
608
609 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
610 tz->trips.active[i].flags.valid; i++) {
611 if (!trip) {
612 *temp = deci_kelvin_to_millicelsius_with_offset(
613 tz->trips.active[i].temperature,
614 tz->kelvin_offset);
615 return 0;
616 }
617 trip--;
618 }
619
620 return -EINVAL;
621}
622
623static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
624 int *temperature)
625{
626 struct acpi_thermal *tz = thermal->devdata;
627
628 if (tz->trips.critical.flags.valid) {
629 *temperature = deci_kelvin_to_millicelsius_with_offset(
630 tz->trips.critical.temperature,
631 tz->kelvin_offset);
632 return 0;
633 } else
634 return -EINVAL;
635}
636
637static int thermal_get_trend(struct thermal_zone_device *thermal,
638 int trip, enum thermal_trend *trend)
639{
640 struct acpi_thermal *tz = thermal->devdata;
641 enum thermal_trip_type type;
642 int i;
643
644 if (thermal_get_trip_type(thermal, trip, &type))
645 return -EINVAL;
646
647 if (type == THERMAL_TRIP_ACTIVE) {
648 int trip_temp;
649 int temp = deci_kelvin_to_millicelsius_with_offset(
650 tz->temperature, tz->kelvin_offset);
651 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
652 return -EINVAL;
653
654 if (temp > trip_temp) {
655 *trend = THERMAL_TREND_RAISING;
656 return 0;
657 } else {
658 /* Fall back on default trend */
659 return -EINVAL;
660 }
661 }
662
663 /*
664 * tz->temperature has already been updated by generic thermal layer,
665 * before this callback being invoked
666 */
667 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
668 + (tz->trips.passive.tc2
669 * (tz->temperature - tz->trips.passive.temperature));
670
671 if (i > 0)
672 *trend = THERMAL_TREND_RAISING;
673 else if (i < 0)
674 *trend = THERMAL_TREND_DROPPING;
675 else
676 *trend = THERMAL_TREND_STABLE;
677 return 0;
678}
679
680
681static int thermal_notify(struct thermal_zone_device *thermal, int trip,
682 enum thermal_trip_type trip_type)
683{
684 u8 type = 0;
685 struct acpi_thermal *tz = thermal->devdata;
686
687 if (trip_type == THERMAL_TRIP_CRITICAL)
688 type = ACPI_THERMAL_NOTIFY_CRITICAL;
689 else if (trip_type == THERMAL_TRIP_HOT)
690 type = ACPI_THERMAL_NOTIFY_HOT;
691 else
692 return 0;
693
694 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
695 dev_name(&tz->device->dev), type, 1);
696
697 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
698 return 1;
699
700 return 0;
701}
702
703static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
704 struct thermal_cooling_device *cdev,
705 bool bind)
706{
707 struct acpi_device *device = cdev->devdata;
708 struct acpi_thermal *tz = thermal->devdata;
709 struct acpi_device *dev;
710 acpi_status status;
711 acpi_handle handle;
712 int i;
713 int j;
714 int trip = -1;
715 int result = 0;
716
717 if (tz->trips.critical.flags.valid)
718 trip++;
719
720 if (tz->trips.hot.flags.valid)
721 trip++;
722
723 if (tz->trips.passive.flags.valid) {
724 trip++;
725 for (i = 0; i < tz->trips.passive.devices.count;
726 i++) {
727 handle = tz->trips.passive.devices.handles[i];
728 status = acpi_bus_get_device(handle, &dev);
729 if (ACPI_FAILURE(status) || dev != device)
730 continue;
731 if (bind)
732 result =
733 thermal_zone_bind_cooling_device
734 (thermal, trip, cdev,
735 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
736 THERMAL_WEIGHT_DEFAULT);
737 else
738 result =
739 thermal_zone_unbind_cooling_device
740 (thermal, trip, cdev);
741 if (result)
742 goto failed;
743 }
744 }
745
746 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
747 if (!tz->trips.active[i].flags.valid)
748 break;
749 trip++;
750 for (j = 0;
751 j < tz->trips.active[i].devices.count;
752 j++) {
753 handle = tz->trips.active[i].devices.handles[j];
754 status = acpi_bus_get_device(handle, &dev);
755 if (ACPI_FAILURE(status) || dev != device)
756 continue;
757 if (bind)
758 result = thermal_zone_bind_cooling_device
759 (thermal, trip, cdev,
760 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
761 THERMAL_WEIGHT_DEFAULT);
762 else
763 result = thermal_zone_unbind_cooling_device
764 (thermal, trip, cdev);
765 if (result)
766 goto failed;
767 }
768 }
769
770 for (i = 0; i < tz->devices.count; i++) {
771 handle = tz->devices.handles[i];
772 status = acpi_bus_get_device(handle, &dev);
773 if (ACPI_SUCCESS(status) && (dev == device)) {
774 if (bind)
775 result = thermal_zone_bind_cooling_device
776 (thermal, THERMAL_TRIPS_NONE,
777 cdev, THERMAL_NO_LIMIT,
778 THERMAL_NO_LIMIT,
779 THERMAL_WEIGHT_DEFAULT);
780 else
781 result = thermal_zone_unbind_cooling_device
782 (thermal, THERMAL_TRIPS_NONE,
783 cdev);
784 if (result)
785 goto failed;
786 }
787 }
788
789failed:
790 return result;
791}
792
793static int
794acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
795 struct thermal_cooling_device *cdev)
796{
797 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
798}
799
800static int
801acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
802 struct thermal_cooling_device *cdev)
803{
804 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
805}
806
807static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
808 .bind = acpi_thermal_bind_cooling_device,
809 .unbind = acpi_thermal_unbind_cooling_device,
810 .get_temp = thermal_get_temp,
811 .get_trip_type = thermal_get_trip_type,
812 .get_trip_temp = thermal_get_trip_temp,
813 .get_crit_temp = thermal_get_crit_temp,
814 .get_trend = thermal_get_trend,
815 .notify = thermal_notify,
816};
817
818static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
819{
820 int trips = 0;
821 int result;
822 acpi_status status;
823 int i;
824
825 if (tz->trips.critical.flags.valid)
826 trips++;
827
828 if (tz->trips.hot.flags.valid)
829 trips++;
830
831 if (tz->trips.passive.flags.valid)
832 trips++;
833
834 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
835 tz->trips.active[i].flags.valid; i++, trips++);
836
837 if (tz->trips.passive.flags.valid)
838 tz->thermal_zone =
839 thermal_zone_device_register("acpitz", trips, 0, tz,
840 &acpi_thermal_zone_ops, NULL,
841 tz->trips.passive.tsp*100,
842 tz->polling_frequency*100);
843 else
844 tz->thermal_zone =
845 thermal_zone_device_register("acpitz", trips, 0, tz,
846 &acpi_thermal_zone_ops, NULL,
847 0, tz->polling_frequency*100);
848 if (IS_ERR(tz->thermal_zone))
849 return -ENODEV;
850
851 result = sysfs_create_link(&tz->device->dev.kobj,
852 &tz->thermal_zone->device.kobj, "thermal_zone");
853 if (result)
854 goto unregister_tzd;
855
856 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
857 &tz->device->dev.kobj, "device");
858 if (result)
859 goto remove_tz_link;
860
861 status = acpi_bus_attach_private_data(tz->device->handle,
862 tz->thermal_zone);
863 if (ACPI_FAILURE(status)) {
864 result = -ENODEV;
865 goto remove_dev_link;
866 }
867
868 result = thermal_zone_device_enable(tz->thermal_zone);
869 if (result)
870 goto acpi_bus_detach;
871
872 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
873 tz->thermal_zone->id);
874
875 return 0;
876
877acpi_bus_detach:
878 acpi_bus_detach_private_data(tz->device->handle);
879remove_dev_link:
880 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
881remove_tz_link:
882 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
883unregister_tzd:
884 thermal_zone_device_unregister(tz->thermal_zone);
885
886 return result;
887}
888
889static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
890{
891 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
892 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
893 thermal_zone_device_unregister(tz->thermal_zone);
894 tz->thermal_zone = NULL;
895 acpi_bus_detach_private_data(tz->device->handle);
896}
897
898
899/* --------------------------------------------------------------------------
900 Driver Interface
901 -------------------------------------------------------------------------- */
902
903static void acpi_thermal_notify(struct acpi_device *device, u32 event)
904{
905 struct acpi_thermal *tz = acpi_driver_data(device);
906
907
908 if (!tz)
909 return;
910
911 switch (event) {
912 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
913 acpi_thermal_check(tz);
914 break;
915 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
916 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
917 acpi_thermal_check(tz);
918 acpi_bus_generate_netlink_event(device->pnp.device_class,
919 dev_name(&device->dev), event, 0);
920 break;
921 case ACPI_THERMAL_NOTIFY_DEVICES:
922 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
923 acpi_thermal_check(tz);
924 acpi_bus_generate_netlink_event(device->pnp.device_class,
925 dev_name(&device->dev), event, 0);
926 break;
927 default:
928 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
929 "Unsupported event [0x%x]\n", event));
930 break;
931 }
932}
933
934/*
935 * On some platforms, the AML code has dependency about
936 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
937 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
938 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
939 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
940 * if _TMP has never been evaluated.
941 *
942 * As this dependency is totally transparent to OS, evaluate
943 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
944 * _TMP, before they are actually used.
945 */
946static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
947{
948 acpi_handle handle = tz->device->handle;
949 unsigned long long value;
950 int i;
951
952 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
953 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
954 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
955 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
956 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
957 acpi_status status;
958
959 status = acpi_evaluate_integer(handle, name, NULL, &value);
960 if (status == AE_NOT_FOUND)
961 break;
962 }
963 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
964}
965
966static int acpi_thermal_get_info(struct acpi_thermal *tz)
967{
968 int result = 0;
969
970
971 if (!tz)
972 return -EINVAL;
973
974 acpi_thermal_aml_dependency_fix(tz);
975
976 /* Get trip points [_CRT, _PSV, etc.] (required) */
977 result = acpi_thermal_get_trip_points(tz);
978 if (result)
979 return result;
980
981 /* Get temperature [_TMP] (required) */
982 result = acpi_thermal_get_temperature(tz);
983 if (result)
984 return result;
985
986 /* Set the cooling mode [_SCP] to active cooling (default) */
987 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
988 if (!result)
989 tz->flags.cooling_mode = 1;
990
991 /* Get default polling frequency [_TZP] (optional) */
992 if (tzp)
993 tz->polling_frequency = tzp;
994 else
995 acpi_thermal_get_polling_frequency(tz);
996
997 return 0;
998}
999
1000/*
1001 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1002 * handles temperature values with a single decimal place. As a consequence,
1003 * some implementations use an offset of 273.1 and others use an offset of
1004 * 273.2. Try to find out which one is being used, to present the most
1005 * accurate and visually appealing number.
1006 *
1007 * The heuristic below should work for all ACPI thermal zones which have a
1008 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1009 */
1010static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1011{
1012 if (tz->trips.critical.flags.valid &&
1013 (tz->trips.critical.temperature % 5) == 1)
1014 tz->kelvin_offset = 273100;
1015 else
1016 tz->kelvin_offset = 273200;
1017}
1018
1019static void acpi_thermal_check_fn(struct work_struct *work)
1020{
1021 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1022 thermal_check_work);
1023 acpi_thermal_check(tz);
1024}
1025
1026static int acpi_thermal_add(struct acpi_device *device)
1027{
1028 int result = 0;
1029 struct acpi_thermal *tz = NULL;
1030
1031
1032 if (!device)
1033 return -EINVAL;
1034
1035 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1036 if (!tz)
1037 return -ENOMEM;
1038
1039 tz->device = device;
1040 strcpy(tz->name, device->pnp.bus_id);
1041 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1042 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1043 device->driver_data = tz;
1044
1045 result = acpi_thermal_get_info(tz);
1046 if (result)
1047 goto free_memory;
1048
1049 acpi_thermal_guess_offset(tz);
1050
1051 result = acpi_thermal_register_thermal_zone(tz);
1052 if (result)
1053 goto free_memory;
1054
1055 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1056
1057 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1058 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
1059 goto end;
1060
1061free_memory:
1062 kfree(tz);
1063end:
1064 return result;
1065}
1066
1067static int acpi_thermal_remove(struct acpi_device *device)
1068{
1069 struct acpi_thermal *tz = NULL;
1070
1071 if (!device || !acpi_driver_data(device))
1072 return -EINVAL;
1073
1074 flush_workqueue(acpi_thermal_pm_queue);
1075 tz = acpi_driver_data(device);
1076
1077 acpi_thermal_unregister_thermal_zone(tz);
1078 kfree(tz);
1079 return 0;
1080}
1081
1082#ifdef CONFIG_PM_SLEEP
1083static int acpi_thermal_suspend(struct device *dev)
1084{
1085 /* Make sure the previously queued thermal check work has been done */
1086 flush_workqueue(acpi_thermal_pm_queue);
1087 return 0;
1088}
1089
1090static int acpi_thermal_resume(struct device *dev)
1091{
1092 struct acpi_thermal *tz;
1093 int i, j, power_state, result;
1094
1095 if (!dev)
1096 return -EINVAL;
1097
1098 tz = acpi_driver_data(to_acpi_device(dev));
1099 if (!tz)
1100 return -EINVAL;
1101
1102 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1103 if (!(&tz->trips.active[i]))
1104 break;
1105 if (!tz->trips.active[i].flags.valid)
1106 break;
1107 tz->trips.active[i].flags.enabled = 1;
1108 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1109 result = acpi_bus_update_power(
1110 tz->trips.active[i].devices.handles[j],
1111 &power_state);
1112 if (result || (power_state != ACPI_STATE_D0)) {
1113 tz->trips.active[i].flags.enabled = 0;
1114 break;
1115 }
1116 }
1117 tz->state.active |= tz->trips.active[i].flags.enabled;
1118 }
1119
1120 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1121
1122 return AE_OK;
1123}
1124#endif
1125
1126static int thermal_act(const struct dmi_system_id *d) {
1127
1128 if (act == 0) {
1129 pr_notice(PREFIX "%s detected: "
1130 "disabling all active thermal trip points\n", d->ident);
1131 act = -1;
1132 }
1133 return 0;
1134}
1135static int thermal_nocrt(const struct dmi_system_id *d) {
1136
1137 pr_notice(PREFIX "%s detected: "
1138 "disabling all critical thermal trip point actions.\n", d->ident);
1139 nocrt = 1;
1140 return 0;
1141}
1142static int thermal_tzp(const struct dmi_system_id *d) {
1143
1144 if (tzp == 0) {
1145 pr_notice(PREFIX "%s detected: "
1146 "enabling thermal zone polling\n", d->ident);
1147 tzp = 300; /* 300 dS = 30 Seconds */
1148 }
1149 return 0;
1150}
1151static int thermal_psv(const struct dmi_system_id *d) {
1152
1153 if (psv == 0) {
1154 pr_notice(PREFIX "%s detected: "
1155 "disabling all passive thermal trip points\n", d->ident);
1156 psv = -1;
1157 }
1158 return 0;
1159}
1160
1161static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1162 /*
1163 * Award BIOS on this AOpen makes thermal control almost worthless.
1164 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1165 */
1166 {
1167 .callback = thermal_act,
1168 .ident = "AOpen i915GMm-HFS",
1169 .matches = {
1170 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1171 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1172 },
1173 },
1174 {
1175 .callback = thermal_psv,
1176 .ident = "AOpen i915GMm-HFS",
1177 .matches = {
1178 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1179 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1180 },
1181 },
1182 {
1183 .callback = thermal_tzp,
1184 .ident = "AOpen i915GMm-HFS",
1185 .matches = {
1186 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1187 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1188 },
1189 },
1190 {
1191 .callback = thermal_nocrt,
1192 .ident = "Gigabyte GA-7ZX",
1193 .matches = {
1194 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1195 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1196 },
1197 },
1198 {}
1199};
1200
1201static int __init acpi_thermal_init(void)
1202{
1203 int result = 0;
1204
1205 dmi_check_system(thermal_dmi_table);
1206
1207 if (off) {
1208 pr_notice(PREFIX "thermal control disabled\n");
1209 return -ENODEV;
1210 }
1211
1212 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1213 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1214 if (!acpi_thermal_pm_queue)
1215 return -ENODEV;
1216
1217 result = acpi_bus_register_driver(&acpi_thermal_driver);
1218 if (result < 0) {
1219 destroy_workqueue(acpi_thermal_pm_queue);
1220 return -ENODEV;
1221 }
1222
1223 return 0;
1224}
1225
1226static void __exit acpi_thermal_exit(void)
1227{
1228 acpi_bus_unregister_driver(&acpi_thermal_driver);
1229 destroy_workqueue(acpi_thermal_pm_queue);
1230
1231 return;
1232}
1233
1234module_init(acpi_thermal_init);
1235module_exit(acpi_thermal_exit);