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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/*
2 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 *
21 * This driver fully implements the ACPI thermal policy as described in the
22 * ACPI 2.0 Specification.
23 *
24 * TBD: 1. Implement passive cooling hysteresis.
25 * 2. Enhance passive cooling (CPU) states/limit interface to support
26 * concepts of 'multiple limiters', upper/lower limits, etc.
27 *
28 */
29
30#include <linux/kernel.h>
31#include <linux/module.h>
32#include <linux/dmi.h>
33#include <linux/init.h>
34#include <linux/slab.h>
35#include <linux/types.h>
36#include <linux/jiffies.h>
37#include <linux/kmod.h>
38#include <linux/reboot.h>
39#include <linux/device.h>
40#include <linux/thermal.h>
41#include <linux/acpi.h>
42#include <linux/workqueue.h>
43#include <asm/uaccess.h>
44
45#define PREFIX "ACPI: "
46
47#define ACPI_THERMAL_CLASS "thermal_zone"
48#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
49#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
50#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
51#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
52#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
53#define ACPI_THERMAL_NOTIFY_HOT 0xF1
54#define ACPI_THERMAL_MODE_ACTIVE 0x00
55
56#define ACPI_THERMAL_MAX_ACTIVE 10
57#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
58
59#define _COMPONENT ACPI_THERMAL_COMPONENT
60ACPI_MODULE_NAME("thermal");
61
62MODULE_AUTHOR("Paul Diefenbaugh");
63MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
64MODULE_LICENSE("GPL");
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 nocrt;
79module_param(nocrt, int, 0);
80MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
81
82static int off;
83module_param(off, int, 0);
84MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
85
86static int psv;
87module_param(psv, int, 0644);
88MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
89
90static struct workqueue_struct *acpi_thermal_pm_queue;
91
92static int acpi_thermal_add(struct acpi_device *device);
93static int acpi_thermal_remove(struct acpi_device *device);
94static void acpi_thermal_notify(struct acpi_device *device, u32 event);
95
96static const struct acpi_device_id thermal_device_ids[] = {
97 {ACPI_THERMAL_HID, 0},
98 {"", 0},
99};
100MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
101
102#ifdef CONFIG_PM_SLEEP
103static int acpi_thermal_suspend(struct device *dev);
104static int acpi_thermal_resume(struct device *dev);
105#else
106#define acpi_thermal_suspend NULL
107#define acpi_thermal_resume NULL
108#endif
109static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
110
111static struct acpi_driver acpi_thermal_driver = {
112 .name = "thermal",
113 .class = ACPI_THERMAL_CLASS,
114 .ids = thermal_device_ids,
115 .ops = {
116 .add = acpi_thermal_add,
117 .remove = acpi_thermal_remove,
118 .notify = acpi_thermal_notify,
119 },
120 .drv.pm = &acpi_thermal_pm,
121};
122
123struct acpi_thermal_state {
124 u8 critical:1;
125 u8 hot:1;
126 u8 passive:1;
127 u8 active:1;
128 u8 reserved:4;
129 int active_index;
130};
131
132struct acpi_thermal_state_flags {
133 u8 valid:1;
134 u8 enabled:1;
135 u8 reserved:6;
136};
137
138struct acpi_thermal_critical {
139 struct acpi_thermal_state_flags flags;
140 unsigned long temperature;
141};
142
143struct acpi_thermal_hot {
144 struct acpi_thermal_state_flags flags;
145 unsigned long temperature;
146};
147
148struct acpi_thermal_passive {
149 struct acpi_thermal_state_flags flags;
150 unsigned long temperature;
151 unsigned long tc1;
152 unsigned long tc2;
153 unsigned long tsp;
154 struct acpi_handle_list devices;
155};
156
157struct acpi_thermal_active {
158 struct acpi_thermal_state_flags flags;
159 unsigned long temperature;
160 struct acpi_handle_list devices;
161};
162
163struct acpi_thermal_trips {
164 struct acpi_thermal_critical critical;
165 struct acpi_thermal_hot hot;
166 struct acpi_thermal_passive passive;
167 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
168};
169
170struct acpi_thermal_flags {
171 u8 cooling_mode:1; /* _SCP */
172 u8 devices:1; /* _TZD */
173 u8 reserved:6;
174};
175
176struct acpi_thermal {
177 struct acpi_device * device;
178 acpi_bus_id name;
179 unsigned long temperature;
180 unsigned long last_temperature;
181 unsigned long polling_frequency;
182 volatile u8 zombie;
183 struct acpi_thermal_flags flags;
184 struct acpi_thermal_state state;
185 struct acpi_thermal_trips trips;
186 struct acpi_handle_list devices;
187 struct thermal_zone_device *thermal_zone;
188 int tz_enabled;
189 int kelvin_offset;
190 struct work_struct thermal_check_work;
191};
192
193/* --------------------------------------------------------------------------
194 Thermal Zone Management
195 -------------------------------------------------------------------------- */
196
197static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
198{
199 acpi_status status = AE_OK;
200 unsigned long long tmp;
201
202 if (!tz)
203 return -EINVAL;
204
205 tz->last_temperature = tz->temperature;
206
207 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
208 if (ACPI_FAILURE(status))
209 return -ENODEV;
210
211 tz->temperature = tmp;
212 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
213 tz->temperature));
214
215 return 0;
216}
217
218static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
219{
220 acpi_status status = AE_OK;
221 unsigned long long tmp;
222
223 if (!tz)
224 return -EINVAL;
225
226 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
227 if (ACPI_FAILURE(status))
228 return -ENODEV;
229
230 tz->polling_frequency = tmp;
231 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
232 tz->polling_frequency));
233
234 return 0;
235}
236
237static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
238{
239 if (!tz)
240 return -EINVAL;
241
242 if (!acpi_has_method(tz->device->handle, "_SCP")) {
243 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
244 return -ENODEV;
245 } else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
246 "_SCP", mode))) {
247 return -ENODEV;
248 }
249
250 return 0;
251}
252
253#define ACPI_TRIPS_CRITICAL 0x01
254#define ACPI_TRIPS_HOT 0x02
255#define ACPI_TRIPS_PASSIVE 0x04
256#define ACPI_TRIPS_ACTIVE 0x08
257#define ACPI_TRIPS_DEVICES 0x10
258
259#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
260#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
261
262#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
263 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
264 ACPI_TRIPS_DEVICES)
265
266/*
267 * This exception is thrown out in two cases:
268 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
269 * when re-evaluating the AML code.
270 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
271 * We need to re-bind the cooling devices of a thermal zone when this occurs.
272 */
273#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
274do { \
275 if (flags != ACPI_TRIPS_INIT) \
276 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
277 "ACPI thermal trip point %s changed\n" \
278 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
279} while (0)
280
281static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
282{
283 acpi_status status = AE_OK;
284 unsigned long long tmp;
285 struct acpi_handle_list devices;
286 int valid = 0;
287 int i;
288
289 /* Critical Shutdown */
290 if (flag & ACPI_TRIPS_CRITICAL) {
291 status = acpi_evaluate_integer(tz->device->handle,
292 "_CRT", NULL, &tmp);
293 tz->trips.critical.temperature = tmp;
294 /*
295 * Treat freezing temperatures as invalid as well; some
296 * BIOSes return really low values and cause reboots at startup.
297 * Below zero (Celsius) values clearly aren't right for sure..
298 * ... so lets discard those as invalid.
299 */
300 if (ACPI_FAILURE(status)) {
301 tz->trips.critical.flags.valid = 0;
302 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
303 "No critical threshold\n"));
304 } else if (tmp <= 2732) {
305 pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
306 tmp);
307 tz->trips.critical.flags.valid = 0;
308 } else {
309 tz->trips.critical.flags.valid = 1;
310 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
311 "Found critical threshold [%lu]\n",
312 tz->trips.critical.temperature));
313 }
314 if (tz->trips.critical.flags.valid == 1) {
315 if (crt == -1) {
316 tz->trips.critical.flags.valid = 0;
317 } else if (crt > 0) {
318 unsigned long crt_k = CELSIUS_TO_DECI_KELVIN(crt);
319 /*
320 * Allow override critical threshold
321 */
322 if (crt_k > tz->trips.critical.temperature)
323 pr_warn(PREFIX "Critical threshold %d C\n",
324 crt);
325 tz->trips.critical.temperature = crt_k;
326 }
327 }
328 }
329
330 /* Critical Sleep (optional) */
331 if (flag & ACPI_TRIPS_HOT) {
332 status = acpi_evaluate_integer(tz->device->handle,
333 "_HOT", NULL, &tmp);
334 if (ACPI_FAILURE(status)) {
335 tz->trips.hot.flags.valid = 0;
336 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
337 "No hot threshold\n"));
338 } else {
339 tz->trips.hot.temperature = tmp;
340 tz->trips.hot.flags.valid = 1;
341 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
342 "Found hot threshold [%lu]\n",
343 tz->trips.hot.temperature));
344 }
345 }
346
347 /* Passive (optional) */
348 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
349 (flag == ACPI_TRIPS_INIT)) {
350 valid = tz->trips.passive.flags.valid;
351 if (psv == -1) {
352 status = AE_SUPPORT;
353 } else if (psv > 0) {
354 tmp = CELSIUS_TO_DECI_KELVIN(psv);
355 status = AE_OK;
356 } else {
357 status = acpi_evaluate_integer(tz->device->handle,
358 "_PSV", NULL, &tmp);
359 }
360
361 if (ACPI_FAILURE(status))
362 tz->trips.passive.flags.valid = 0;
363 else {
364 tz->trips.passive.temperature = tmp;
365 tz->trips.passive.flags.valid = 1;
366 if (flag == ACPI_TRIPS_INIT) {
367 status = acpi_evaluate_integer(
368 tz->device->handle, "_TC1",
369 NULL, &tmp);
370 if (ACPI_FAILURE(status))
371 tz->trips.passive.flags.valid = 0;
372 else
373 tz->trips.passive.tc1 = tmp;
374 status = acpi_evaluate_integer(
375 tz->device->handle, "_TC2",
376 NULL, &tmp);
377 if (ACPI_FAILURE(status))
378 tz->trips.passive.flags.valid = 0;
379 else
380 tz->trips.passive.tc2 = tmp;
381 status = acpi_evaluate_integer(
382 tz->device->handle, "_TSP",
383 NULL, &tmp);
384 if (ACPI_FAILURE(status))
385 tz->trips.passive.flags.valid = 0;
386 else
387 tz->trips.passive.tsp = tmp;
388 }
389 }
390 }
391 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
392 memset(&devices, 0, sizeof(struct acpi_handle_list));
393 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
394 NULL, &devices);
395 if (ACPI_FAILURE(status)) {
396 pr_warn(PREFIX "Invalid passive threshold\n");
397 tz->trips.passive.flags.valid = 0;
398 }
399 else
400 tz->trips.passive.flags.valid = 1;
401
402 if (memcmp(&tz->trips.passive.devices, &devices,
403 sizeof(struct acpi_handle_list))) {
404 memcpy(&tz->trips.passive.devices, &devices,
405 sizeof(struct acpi_handle_list));
406 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
407 }
408 }
409 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
410 if (valid != tz->trips.passive.flags.valid)
411 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
412 }
413
414 /* Active (optional) */
415 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
416 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
417 valid = tz->trips.active[i].flags.valid;
418
419 if (act == -1)
420 break; /* disable all active trip points */
421
422 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
423 tz->trips.active[i].flags.valid)) {
424 status = acpi_evaluate_integer(tz->device->handle,
425 name, NULL, &tmp);
426 if (ACPI_FAILURE(status)) {
427 tz->trips.active[i].flags.valid = 0;
428 if (i == 0)
429 break;
430 if (act <= 0)
431 break;
432 if (i == 1)
433 tz->trips.active[0].temperature =
434 CELSIUS_TO_DECI_KELVIN(act);
435 else
436 /*
437 * Don't allow override higher than
438 * the next higher trip point
439 */
440 tz->trips.active[i - 1].temperature =
441 (tz->trips.active[i - 2].temperature <
442 CELSIUS_TO_DECI_KELVIN(act) ?
443 tz->trips.active[i - 2].temperature :
444 CELSIUS_TO_DECI_KELVIN(act));
445 break;
446 } else {
447 tz->trips.active[i].temperature = tmp;
448 tz->trips.active[i].flags.valid = 1;
449 }
450 }
451
452 name[2] = 'L';
453 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
454 memset(&devices, 0, sizeof(struct acpi_handle_list));
455 status = acpi_evaluate_reference(tz->device->handle,
456 name, NULL, &devices);
457 if (ACPI_FAILURE(status)) {
458 pr_warn(PREFIX "Invalid active%d threshold\n",
459 i);
460 tz->trips.active[i].flags.valid = 0;
461 }
462 else
463 tz->trips.active[i].flags.valid = 1;
464
465 if (memcmp(&tz->trips.active[i].devices, &devices,
466 sizeof(struct acpi_handle_list))) {
467 memcpy(&tz->trips.active[i].devices, &devices,
468 sizeof(struct acpi_handle_list));
469 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
470 }
471 }
472 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
473 if (valid != tz->trips.active[i].flags.valid)
474 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
475
476 if (!tz->trips.active[i].flags.valid)
477 break;
478 }
479
480 if ((flag & ACPI_TRIPS_DEVICES)
481 && acpi_has_method(tz->device->handle, "_TZD")) {
482 memset(&devices, 0, sizeof(devices));
483 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
484 NULL, &devices);
485 if (ACPI_SUCCESS(status)
486 && memcmp(&tz->devices, &devices, sizeof(devices))) {
487 tz->devices = devices;
488 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
489 }
490 }
491
492 return 0;
493}
494
495static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
496{
497 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
498
499 if (ret)
500 return ret;
501
502 valid = tz->trips.critical.flags.valid |
503 tz->trips.hot.flags.valid |
504 tz->trips.passive.flags.valid;
505
506 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
507 valid |= tz->trips.active[i].flags.valid;
508
509 if (!valid) {
510 pr_warn(FW_BUG "No valid trip found\n");
511 return -ENODEV;
512 }
513 return 0;
514}
515
516static void acpi_thermal_check(void *data)
517{
518 struct acpi_thermal *tz = data;
519
520 if (!tz->tz_enabled)
521 return;
522
523 thermal_zone_device_update(tz->thermal_zone);
524}
525
526/* sys I/F for generic thermal sysfs support */
527
528static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
529{
530 struct acpi_thermal *tz = thermal->devdata;
531 int result;
532
533 if (!tz)
534 return -EINVAL;
535
536 result = acpi_thermal_get_temperature(tz);
537 if (result)
538 return result;
539
540 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(tz->temperature,
541 tz->kelvin_offset);
542 return 0;
543}
544
545static int thermal_get_mode(struct thermal_zone_device *thermal,
546 enum thermal_device_mode *mode)
547{
548 struct acpi_thermal *tz = thermal->devdata;
549
550 if (!tz)
551 return -EINVAL;
552
553 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
554 THERMAL_DEVICE_DISABLED;
555
556 return 0;
557}
558
559static int thermal_set_mode(struct thermal_zone_device *thermal,
560 enum thermal_device_mode mode)
561{
562 struct acpi_thermal *tz = thermal->devdata;
563 int enable;
564
565 if (!tz)
566 return -EINVAL;
567
568 /*
569 * enable/disable thermal management from ACPI thermal driver
570 */
571 if (mode == THERMAL_DEVICE_ENABLED)
572 enable = 1;
573 else if (mode == THERMAL_DEVICE_DISABLED) {
574 enable = 0;
575 pr_warn("thermal zone will be disabled\n");
576 } else
577 return -EINVAL;
578
579 if (enable != tz->tz_enabled) {
580 tz->tz_enabled = enable;
581 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
582 "%s kernel ACPI thermal control\n",
583 tz->tz_enabled ? "Enable" : "Disable"));
584 acpi_thermal_check(tz);
585 }
586 return 0;
587}
588
589static int thermal_get_trip_type(struct thermal_zone_device *thermal,
590 int trip, enum thermal_trip_type *type)
591{
592 struct acpi_thermal *tz = thermal->devdata;
593 int i;
594
595 if (!tz || trip < 0)
596 return -EINVAL;
597
598 if (tz->trips.critical.flags.valid) {
599 if (!trip) {
600 *type = THERMAL_TRIP_CRITICAL;
601 return 0;
602 }
603 trip--;
604 }
605
606 if (tz->trips.hot.flags.valid) {
607 if (!trip) {
608 *type = THERMAL_TRIP_HOT;
609 return 0;
610 }
611 trip--;
612 }
613
614 if (tz->trips.passive.flags.valid) {
615 if (!trip) {
616 *type = THERMAL_TRIP_PASSIVE;
617 return 0;
618 }
619 trip--;
620 }
621
622 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
623 tz->trips.active[i].flags.valid; i++) {
624 if (!trip) {
625 *type = THERMAL_TRIP_ACTIVE;
626 return 0;
627 }
628 trip--;
629 }
630
631 return -EINVAL;
632}
633
634static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
635 int trip, int *temp)
636{
637 struct acpi_thermal *tz = thermal->devdata;
638 int i;
639
640 if (!tz || trip < 0)
641 return -EINVAL;
642
643 if (tz->trips.critical.flags.valid) {
644 if (!trip) {
645 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
646 tz->trips.critical.temperature,
647 tz->kelvin_offset);
648 return 0;
649 }
650 trip--;
651 }
652
653 if (tz->trips.hot.flags.valid) {
654 if (!trip) {
655 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
656 tz->trips.hot.temperature,
657 tz->kelvin_offset);
658 return 0;
659 }
660 trip--;
661 }
662
663 if (tz->trips.passive.flags.valid) {
664 if (!trip) {
665 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
666 tz->trips.passive.temperature,
667 tz->kelvin_offset);
668 return 0;
669 }
670 trip--;
671 }
672
673 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
674 tz->trips.active[i].flags.valid; i++) {
675 if (!trip) {
676 *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
677 tz->trips.active[i].temperature,
678 tz->kelvin_offset);
679 return 0;
680 }
681 trip--;
682 }
683
684 return -EINVAL;
685}
686
687static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
688 int *temperature)
689{
690 struct acpi_thermal *tz = thermal->devdata;
691
692 if (tz->trips.critical.flags.valid) {
693 *temperature = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
694 tz->trips.critical.temperature,
695 tz->kelvin_offset);
696 return 0;
697 } else
698 return -EINVAL;
699}
700
701static int thermal_get_trend(struct thermal_zone_device *thermal,
702 int trip, enum thermal_trend *trend)
703{
704 struct acpi_thermal *tz = thermal->devdata;
705 enum thermal_trip_type type;
706 int i;
707
708 if (thermal_get_trip_type(thermal, trip, &type))
709 return -EINVAL;
710
711 if (type == THERMAL_TRIP_ACTIVE) {
712 int trip_temp;
713 int temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
714 tz->temperature, tz->kelvin_offset);
715 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
716 return -EINVAL;
717
718 if (temp > trip_temp) {
719 *trend = THERMAL_TREND_RAISING;
720 return 0;
721 } else {
722 /* Fall back on default trend */
723 return -EINVAL;
724 }
725 }
726
727 /*
728 * tz->temperature has already been updated by generic thermal layer,
729 * before this callback being invoked
730 */
731 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
732 + (tz->trips.passive.tc2
733 * (tz->temperature - tz->trips.passive.temperature));
734
735 if (i > 0)
736 *trend = THERMAL_TREND_RAISING;
737 else if (i < 0)
738 *trend = THERMAL_TREND_DROPPING;
739 else
740 *trend = THERMAL_TREND_STABLE;
741 return 0;
742}
743
744
745static int thermal_notify(struct thermal_zone_device *thermal, int trip,
746 enum thermal_trip_type trip_type)
747{
748 u8 type = 0;
749 struct acpi_thermal *tz = thermal->devdata;
750
751 if (trip_type == THERMAL_TRIP_CRITICAL)
752 type = ACPI_THERMAL_NOTIFY_CRITICAL;
753 else if (trip_type == THERMAL_TRIP_HOT)
754 type = ACPI_THERMAL_NOTIFY_HOT;
755 else
756 return 0;
757
758 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
759 dev_name(&tz->device->dev), type, 1);
760
761 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
762 return 1;
763
764 return 0;
765}
766
767static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
768 struct thermal_cooling_device *cdev,
769 bool bind)
770{
771 struct acpi_device *device = cdev->devdata;
772 struct acpi_thermal *tz = thermal->devdata;
773 struct acpi_device *dev;
774 acpi_status status;
775 acpi_handle handle;
776 int i;
777 int j;
778 int trip = -1;
779 int result = 0;
780
781 if (tz->trips.critical.flags.valid)
782 trip++;
783
784 if (tz->trips.hot.flags.valid)
785 trip++;
786
787 if (tz->trips.passive.flags.valid) {
788 trip++;
789 for (i = 0; i < tz->trips.passive.devices.count;
790 i++) {
791 handle = tz->trips.passive.devices.handles[i];
792 status = acpi_bus_get_device(handle, &dev);
793 if (ACPI_FAILURE(status) || dev != device)
794 continue;
795 if (bind)
796 result =
797 thermal_zone_bind_cooling_device
798 (thermal, trip, cdev,
799 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
800 THERMAL_WEIGHT_DEFAULT);
801 else
802 result =
803 thermal_zone_unbind_cooling_device
804 (thermal, trip, cdev);
805 if (result)
806 goto failed;
807 }
808 }
809
810 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
811 if (!tz->trips.active[i].flags.valid)
812 break;
813 trip++;
814 for (j = 0;
815 j < tz->trips.active[i].devices.count;
816 j++) {
817 handle = tz->trips.active[i].devices.handles[j];
818 status = acpi_bus_get_device(handle, &dev);
819 if (ACPI_FAILURE(status) || dev != device)
820 continue;
821 if (bind)
822 result = thermal_zone_bind_cooling_device
823 (thermal, trip, cdev,
824 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
825 THERMAL_WEIGHT_DEFAULT);
826 else
827 result = thermal_zone_unbind_cooling_device
828 (thermal, trip, cdev);
829 if (result)
830 goto failed;
831 }
832 }
833
834 for (i = 0; i < tz->devices.count; i++) {
835 handle = tz->devices.handles[i];
836 status = acpi_bus_get_device(handle, &dev);
837 if (ACPI_SUCCESS(status) && (dev == device)) {
838 if (bind)
839 result = thermal_zone_bind_cooling_device
840 (thermal, THERMAL_TRIPS_NONE,
841 cdev, THERMAL_NO_LIMIT,
842 THERMAL_NO_LIMIT,
843 THERMAL_WEIGHT_DEFAULT);
844 else
845 result = thermal_zone_unbind_cooling_device
846 (thermal, THERMAL_TRIPS_NONE,
847 cdev);
848 if (result)
849 goto failed;
850 }
851 }
852
853failed:
854 return result;
855}
856
857static int
858acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
859 struct thermal_cooling_device *cdev)
860{
861 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
862}
863
864static int
865acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
866 struct thermal_cooling_device *cdev)
867{
868 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
869}
870
871static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
872 .bind = acpi_thermal_bind_cooling_device,
873 .unbind = acpi_thermal_unbind_cooling_device,
874 .get_temp = thermal_get_temp,
875 .get_mode = thermal_get_mode,
876 .set_mode = thermal_set_mode,
877 .get_trip_type = thermal_get_trip_type,
878 .get_trip_temp = thermal_get_trip_temp,
879 .get_crit_temp = thermal_get_crit_temp,
880 .get_trend = thermal_get_trend,
881 .notify = thermal_notify,
882};
883
884static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
885{
886 int trips = 0;
887 int result;
888 acpi_status status;
889 int i;
890
891 if (tz->trips.critical.flags.valid)
892 trips++;
893
894 if (tz->trips.hot.flags.valid)
895 trips++;
896
897 if (tz->trips.passive.flags.valid)
898 trips++;
899
900 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
901 tz->trips.active[i].flags.valid; i++, trips++);
902
903 if (tz->trips.passive.flags.valid)
904 tz->thermal_zone =
905 thermal_zone_device_register("acpitz", trips, 0, tz,
906 &acpi_thermal_zone_ops, NULL,
907 tz->trips.passive.tsp*100,
908 tz->polling_frequency*100);
909 else
910 tz->thermal_zone =
911 thermal_zone_device_register("acpitz", trips, 0, tz,
912 &acpi_thermal_zone_ops, NULL,
913 0, tz->polling_frequency*100);
914 if (IS_ERR(tz->thermal_zone))
915 return -ENODEV;
916
917 result = sysfs_create_link(&tz->device->dev.kobj,
918 &tz->thermal_zone->device.kobj, "thermal_zone");
919 if (result)
920 return result;
921
922 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
923 &tz->device->dev.kobj, "device");
924 if (result)
925 return result;
926
927 status = acpi_bus_attach_private_data(tz->device->handle,
928 tz->thermal_zone);
929 if (ACPI_FAILURE(status))
930 return -ENODEV;
931
932 tz->tz_enabled = 1;
933
934 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
935 tz->thermal_zone->id);
936 return 0;
937}
938
939static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
940{
941 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
942 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
943 thermal_zone_device_unregister(tz->thermal_zone);
944 tz->thermal_zone = NULL;
945 acpi_bus_detach_private_data(tz->device->handle);
946}
947
948
949/* --------------------------------------------------------------------------
950 Driver Interface
951 -------------------------------------------------------------------------- */
952
953static void acpi_thermal_notify(struct acpi_device *device, u32 event)
954{
955 struct acpi_thermal *tz = acpi_driver_data(device);
956
957
958 if (!tz)
959 return;
960
961 switch (event) {
962 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
963 acpi_thermal_check(tz);
964 break;
965 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
966 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
967 acpi_thermal_check(tz);
968 acpi_bus_generate_netlink_event(device->pnp.device_class,
969 dev_name(&device->dev), event, 0);
970 break;
971 case ACPI_THERMAL_NOTIFY_DEVICES:
972 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
973 acpi_thermal_check(tz);
974 acpi_bus_generate_netlink_event(device->pnp.device_class,
975 dev_name(&device->dev), event, 0);
976 break;
977 default:
978 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
979 "Unsupported event [0x%x]\n", event));
980 break;
981 }
982}
983
984/*
985 * On some platforms, the AML code has dependency about
986 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
987 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
988 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
989 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
990 * if _TMP has never been evaluated.
991 *
992 * As this dependency is totally transparent to OS, evaluate
993 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
994 * _TMP, before they are actually used.
995 */
996static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
997{
998 acpi_handle handle = tz->device->handle;
999 unsigned long long value;
1000 int i;
1001
1002 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1003 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1004 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1005 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1006 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1007 acpi_status status;
1008
1009 status = acpi_evaluate_integer(handle, name, NULL, &value);
1010 if (status == AE_NOT_FOUND)
1011 break;
1012 }
1013 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1014}
1015
1016static int acpi_thermal_get_info(struct acpi_thermal *tz)
1017{
1018 int result = 0;
1019
1020
1021 if (!tz)
1022 return -EINVAL;
1023
1024 acpi_thermal_aml_dependency_fix(tz);
1025
1026 /* Get trip points [_CRT, _PSV, etc.] (required) */
1027 result = acpi_thermal_get_trip_points(tz);
1028 if (result)
1029 return result;
1030
1031 /* Get temperature [_TMP] (required) */
1032 result = acpi_thermal_get_temperature(tz);
1033 if (result)
1034 return result;
1035
1036 /* Set the cooling mode [_SCP] to active cooling (default) */
1037 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1038 if (!result)
1039 tz->flags.cooling_mode = 1;
1040
1041 /* Get default polling frequency [_TZP] (optional) */
1042 if (tzp)
1043 tz->polling_frequency = tzp;
1044 else
1045 acpi_thermal_get_polling_frequency(tz);
1046
1047 return 0;
1048}
1049
1050/*
1051 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1052 * handles temperature values with a single decimal place. As a consequence,
1053 * some implementations use an offset of 273.1 and others use an offset of
1054 * 273.2. Try to find out which one is being used, to present the most
1055 * accurate and visually appealing number.
1056 *
1057 * The heuristic below should work for all ACPI thermal zones which have a
1058 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1059 */
1060static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1061{
1062 if (tz->trips.critical.flags.valid &&
1063 (tz->trips.critical.temperature % 5) == 1)
1064 tz->kelvin_offset = 2731;
1065 else
1066 tz->kelvin_offset = 2732;
1067}
1068
1069static void acpi_thermal_check_fn(struct work_struct *work)
1070{
1071 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1072 thermal_check_work);
1073 acpi_thermal_check(tz);
1074}
1075
1076static int acpi_thermal_add(struct acpi_device *device)
1077{
1078 int result = 0;
1079 struct acpi_thermal *tz = NULL;
1080
1081
1082 if (!device)
1083 return -EINVAL;
1084
1085 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1086 if (!tz)
1087 return -ENOMEM;
1088
1089 tz->device = device;
1090 strcpy(tz->name, device->pnp.bus_id);
1091 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1092 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1093 device->driver_data = tz;
1094
1095 result = acpi_thermal_get_info(tz);
1096 if (result)
1097 goto free_memory;
1098
1099 acpi_thermal_guess_offset(tz);
1100
1101 result = acpi_thermal_register_thermal_zone(tz);
1102 if (result)
1103 goto free_memory;
1104
1105 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1106
1107 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1108 acpi_device_bid(device), DECI_KELVIN_TO_CELSIUS(tz->temperature));
1109 goto end;
1110
1111free_memory:
1112 kfree(tz);
1113end:
1114 return result;
1115}
1116
1117static int acpi_thermal_remove(struct acpi_device *device)
1118{
1119 struct acpi_thermal *tz = NULL;
1120
1121 if (!device || !acpi_driver_data(device))
1122 return -EINVAL;
1123
1124 flush_workqueue(acpi_thermal_pm_queue);
1125 tz = acpi_driver_data(device);
1126
1127 acpi_thermal_unregister_thermal_zone(tz);
1128 kfree(tz);
1129 return 0;
1130}
1131
1132#ifdef CONFIG_PM_SLEEP
1133static int acpi_thermal_suspend(struct device *dev)
1134{
1135 /* Make sure the previously queued thermal check work has been done */
1136 flush_workqueue(acpi_thermal_pm_queue);
1137 return 0;
1138}
1139
1140static int acpi_thermal_resume(struct device *dev)
1141{
1142 struct acpi_thermal *tz;
1143 int i, j, power_state, result;
1144
1145 if (!dev)
1146 return -EINVAL;
1147
1148 tz = acpi_driver_data(to_acpi_device(dev));
1149 if (!tz)
1150 return -EINVAL;
1151
1152 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1153 if (!(&tz->trips.active[i]))
1154 break;
1155 if (!tz->trips.active[i].flags.valid)
1156 break;
1157 tz->trips.active[i].flags.enabled = 1;
1158 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1159 result = acpi_bus_update_power(
1160 tz->trips.active[i].devices.handles[j],
1161 &power_state);
1162 if (result || (power_state != ACPI_STATE_D0)) {
1163 tz->trips.active[i].flags.enabled = 0;
1164 break;
1165 }
1166 }
1167 tz->state.active |= tz->trips.active[i].flags.enabled;
1168 }
1169
1170 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1171
1172 return AE_OK;
1173}
1174#endif
1175
1176static int thermal_act(const struct dmi_system_id *d) {
1177
1178 if (act == 0) {
1179 pr_notice(PREFIX "%s detected: "
1180 "disabling all active thermal trip points\n", d->ident);
1181 act = -1;
1182 }
1183 return 0;
1184}
1185static int thermal_nocrt(const struct dmi_system_id *d) {
1186
1187 pr_notice(PREFIX "%s detected: "
1188 "disabling all critical thermal trip point actions.\n", d->ident);
1189 nocrt = 1;
1190 return 0;
1191}
1192static int thermal_tzp(const struct dmi_system_id *d) {
1193
1194 if (tzp == 0) {
1195 pr_notice(PREFIX "%s detected: "
1196 "enabling thermal zone polling\n", d->ident);
1197 tzp = 300; /* 300 dS = 30 Seconds */
1198 }
1199 return 0;
1200}
1201static int thermal_psv(const struct dmi_system_id *d) {
1202
1203 if (psv == 0) {
1204 pr_notice(PREFIX "%s detected: "
1205 "disabling all passive thermal trip points\n", d->ident);
1206 psv = -1;
1207 }
1208 return 0;
1209}
1210
1211static struct dmi_system_id thermal_dmi_table[] __initdata = {
1212 /*
1213 * Award BIOS on this AOpen makes thermal control almost worthless.
1214 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1215 */
1216 {
1217 .callback = thermal_act,
1218 .ident = "AOpen i915GMm-HFS",
1219 .matches = {
1220 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1221 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1222 },
1223 },
1224 {
1225 .callback = thermal_psv,
1226 .ident = "AOpen i915GMm-HFS",
1227 .matches = {
1228 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1229 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1230 },
1231 },
1232 {
1233 .callback = thermal_tzp,
1234 .ident = "AOpen i915GMm-HFS",
1235 .matches = {
1236 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1237 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1238 },
1239 },
1240 {
1241 .callback = thermal_nocrt,
1242 .ident = "Gigabyte GA-7ZX",
1243 .matches = {
1244 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1245 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1246 },
1247 },
1248 {}
1249};
1250
1251static int __init acpi_thermal_init(void)
1252{
1253 int result = 0;
1254
1255 dmi_check_system(thermal_dmi_table);
1256
1257 if (off) {
1258 pr_notice(PREFIX "thermal control disabled\n");
1259 return -ENODEV;
1260 }
1261
1262 acpi_thermal_pm_queue = create_workqueue("acpi_thermal_pm");
1263 if (!acpi_thermal_pm_queue)
1264 return -ENODEV;
1265
1266 result = acpi_bus_register_driver(&acpi_thermal_driver);
1267 if (result < 0) {
1268 destroy_workqueue(acpi_thermal_pm_queue);
1269 return -ENODEV;
1270 }
1271
1272 return 0;
1273}
1274
1275static void __exit acpi_thermal_exit(void)
1276{
1277 acpi_bus_unregister_driver(&acpi_thermal_driver);
1278 destroy_workqueue(acpi_thermal_pm_queue);
1279
1280 return;
1281}
1282
1283module_init(acpi_thermal_init);
1284module_exit(acpi_thermal_exit);