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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 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 *
25 * This driver fully implements the ACPI thermal policy as described in the
26 * ACPI 2.0 Specification.
27 *
28 * TBD: 1. Implement passive cooling hysteresis.
29 * 2. Enhance passive cooling (CPU) states/limit interface to support
30 * concepts of 'multiple limiters', upper/lower limits, etc.
31 *
32 */
33
34#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/dmi.h>
37#include <linux/init.h>
38#include <linux/slab.h>
39#include <linux/types.h>
40#include <linux/jiffies.h>
41#include <linux/kmod.h>
42#include <linux/reboot.h>
43#include <linux/device.h>
44#include <linux/thermal.h>
45#include <linux/acpi.h>
46#include <linux/workqueue.h>
47#include <asm/uaccess.h>
48
49#define PREFIX "ACPI: "
50
51#define ACPI_THERMAL_CLASS "thermal_zone"
52#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
53#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
54#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
55#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
56#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
57#define ACPI_THERMAL_NOTIFY_HOT 0xF1
58#define ACPI_THERMAL_MODE_ACTIVE 0x00
59
60#define ACPI_THERMAL_MAX_ACTIVE 10
61#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
62
63#define _COMPONENT ACPI_THERMAL_COMPONENT
64ACPI_MODULE_NAME("thermal");
65
66MODULE_AUTHOR("Paul Diefenbaugh");
67MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
68MODULE_LICENSE("GPL");
69
70static int act;
71module_param(act, int, 0644);
72MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
73
74static int crt;
75module_param(crt, int, 0644);
76MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
77
78static int tzp;
79module_param(tzp, int, 0444);
80MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
81
82static int nocrt;
83module_param(nocrt, int, 0);
84MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
85
86static int off;
87module_param(off, int, 0);
88MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
89
90static int psv;
91module_param(psv, int, 0644);
92MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
93
94static struct workqueue_struct *acpi_thermal_pm_queue;
95
96static int acpi_thermal_add(struct acpi_device *device);
97static int acpi_thermal_remove(struct acpi_device *device);
98static void acpi_thermal_notify(struct acpi_device *device, u32 event);
99
100static const struct acpi_device_id thermal_device_ids[] = {
101 {ACPI_THERMAL_HID, 0},
102 {"", 0},
103};
104MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
105
106#ifdef CONFIG_PM_SLEEP
107static int acpi_thermal_suspend(struct device *dev);
108static int acpi_thermal_resume(struct device *dev);
109#else
110#define acpi_thermal_suspend NULL
111#define acpi_thermal_resume NULL
112#endif
113static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
114
115static struct acpi_driver acpi_thermal_driver = {
116 .name = "thermal",
117 .class = ACPI_THERMAL_CLASS,
118 .ids = thermal_device_ids,
119 .ops = {
120 .add = acpi_thermal_add,
121 .remove = acpi_thermal_remove,
122 .notify = acpi_thermal_notify,
123 },
124 .drv.pm = &acpi_thermal_pm,
125};
126
127struct acpi_thermal_state {
128 u8 critical:1;
129 u8 hot:1;
130 u8 passive:1;
131 u8 active:1;
132 u8 reserved:4;
133 int active_index;
134};
135
136struct acpi_thermal_state_flags {
137 u8 valid:1;
138 u8 enabled:1;
139 u8 reserved:6;
140};
141
142struct acpi_thermal_critical {
143 struct acpi_thermal_state_flags flags;
144 unsigned long temperature;
145};
146
147struct acpi_thermal_hot {
148 struct acpi_thermal_state_flags flags;
149 unsigned long temperature;
150};
151
152struct acpi_thermal_passive {
153 struct acpi_thermal_state_flags flags;
154 unsigned long temperature;
155 unsigned long tc1;
156 unsigned long tc2;
157 unsigned long tsp;
158 struct acpi_handle_list devices;
159};
160
161struct acpi_thermal_active {
162 struct acpi_thermal_state_flags flags;
163 unsigned long temperature;
164 struct acpi_handle_list devices;
165};
166
167struct acpi_thermal_trips {
168 struct acpi_thermal_critical critical;
169 struct acpi_thermal_hot hot;
170 struct acpi_thermal_passive passive;
171 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
172};
173
174struct acpi_thermal_flags {
175 u8 cooling_mode:1; /* _SCP */
176 u8 devices:1; /* _TZD */
177 u8 reserved:6;
178};
179
180struct acpi_thermal {
181 struct acpi_device * device;
182 acpi_bus_id name;
183 unsigned long temperature;
184 unsigned long last_temperature;
185 unsigned long polling_frequency;
186 volatile u8 zombie;
187 struct acpi_thermal_flags flags;
188 struct acpi_thermal_state state;
189 struct acpi_thermal_trips trips;
190 struct acpi_handle_list devices;
191 struct thermal_zone_device *thermal_zone;
192 int tz_enabled;
193 int kelvin_offset;
194 struct work_struct thermal_check_work;
195};
196
197/* --------------------------------------------------------------------------
198 Thermal Zone Management
199 -------------------------------------------------------------------------- */
200
201static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
202{
203 acpi_status status = AE_OK;
204 unsigned long long tmp;
205
206 if (!tz)
207 return -EINVAL;
208
209 tz->last_temperature = tz->temperature;
210
211 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
212 if (ACPI_FAILURE(status))
213 return -ENODEV;
214
215 tz->temperature = tmp;
216 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
217 tz->temperature));
218
219 return 0;
220}
221
222static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
223{
224 acpi_status status = AE_OK;
225 unsigned long long tmp;
226
227 if (!tz)
228 return -EINVAL;
229
230 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
231 if (ACPI_FAILURE(status))
232 return -ENODEV;
233
234 tz->polling_frequency = tmp;
235 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
236 tz->polling_frequency));
237
238 return 0;
239}
240
241static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
242{
243 if (!tz)
244 return -EINVAL;
245
246 if (!acpi_has_method(tz->device->handle, "_SCP")) {
247 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
248 return -ENODEV;
249 } else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
250 "_SCP", mode))) {
251 return -ENODEV;
252 }
253
254 return 0;
255}
256
257#define ACPI_TRIPS_CRITICAL 0x01
258#define ACPI_TRIPS_HOT 0x02
259#define ACPI_TRIPS_PASSIVE 0x04
260#define ACPI_TRIPS_ACTIVE 0x08
261#define ACPI_TRIPS_DEVICES 0x10
262
263#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
264#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
265
266#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
267 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
268 ACPI_TRIPS_DEVICES)
269
270/*
271 * This exception is thrown out in two cases:
272 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
273 * when re-evaluating the AML code.
274 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
275 * We need to re-bind the cooling devices of a thermal zone when this occurs.
276 */
277#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
278do { \
279 if (flags != ACPI_TRIPS_INIT) \
280 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
281 "ACPI thermal trip point %s changed\n" \
282 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
283} while (0)
284
285static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
286{
287 acpi_status status = AE_OK;
288 unsigned long long tmp;
289 struct acpi_handle_list devices;
290 int valid = 0;
291 int i;
292
293 /* Critical Shutdown */
294 if (flag & ACPI_TRIPS_CRITICAL) {
295 status = acpi_evaluate_integer(tz->device->handle,
296 "_CRT", NULL, &tmp);
297 tz->trips.critical.temperature = tmp;
298 /*
299 * Treat freezing temperatures as invalid as well; some
300 * BIOSes return really low values and cause reboots at startup.
301 * Below zero (Celsius) values clearly aren't right for sure..
302 * ... so lets discard those as invalid.
303 */
304 if (ACPI_FAILURE(status)) {
305 tz->trips.critical.flags.valid = 0;
306 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
307 "No critical threshold\n"));
308 } else if (tmp <= 2732) {
309 pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
310 tmp);
311 tz->trips.critical.flags.valid = 0;
312 } else {
313 tz->trips.critical.flags.valid = 1;
314 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
315 "Found critical threshold [%lu]\n",
316 tz->trips.critical.temperature));
317 }
318 if (tz->trips.critical.flags.valid == 1) {
319 if (crt == -1) {
320 tz->trips.critical.flags.valid = 0;
321 } else if (crt > 0) {
322 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
323 /*
324 * Allow override critical threshold
325 */
326 if (crt_k > tz->trips.critical.temperature)
327 pr_warn(PREFIX "Critical threshold %d C\n",
328 crt);
329 tz->trips.critical.temperature = crt_k;
330 }
331 }
332 }
333
334 /* Critical Sleep (optional) */
335 if (flag & ACPI_TRIPS_HOT) {
336 status = acpi_evaluate_integer(tz->device->handle,
337 "_HOT", NULL, &tmp);
338 if (ACPI_FAILURE(status)) {
339 tz->trips.hot.flags.valid = 0;
340 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
341 "No hot threshold\n"));
342 } else {
343 tz->trips.hot.temperature = tmp;
344 tz->trips.hot.flags.valid = 1;
345 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
346 "Found hot threshold [%lu]\n",
347 tz->trips.hot.temperature));
348 }
349 }
350
351 /* Passive (optional) */
352 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
353 (flag == ACPI_TRIPS_INIT)) {
354 valid = tz->trips.passive.flags.valid;
355 if (psv == -1) {
356 status = AE_SUPPORT;
357 } else if (psv > 0) {
358 tmp = CELSIUS_TO_KELVIN(psv);
359 status = AE_OK;
360 } else {
361 status = acpi_evaluate_integer(tz->device->handle,
362 "_PSV", NULL, &tmp);
363 }
364
365 if (ACPI_FAILURE(status))
366 tz->trips.passive.flags.valid = 0;
367 else {
368 tz->trips.passive.temperature = tmp;
369 tz->trips.passive.flags.valid = 1;
370 if (flag == ACPI_TRIPS_INIT) {
371 status = acpi_evaluate_integer(
372 tz->device->handle, "_TC1",
373 NULL, &tmp);
374 if (ACPI_FAILURE(status))
375 tz->trips.passive.flags.valid = 0;
376 else
377 tz->trips.passive.tc1 = tmp;
378 status = acpi_evaluate_integer(
379 tz->device->handle, "_TC2",
380 NULL, &tmp);
381 if (ACPI_FAILURE(status))
382 tz->trips.passive.flags.valid = 0;
383 else
384 tz->trips.passive.tc2 = tmp;
385 status = acpi_evaluate_integer(
386 tz->device->handle, "_TSP",
387 NULL, &tmp);
388 if (ACPI_FAILURE(status))
389 tz->trips.passive.flags.valid = 0;
390 else
391 tz->trips.passive.tsp = tmp;
392 }
393 }
394 }
395 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
396 memset(&devices, 0, sizeof(struct acpi_handle_list));
397 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
398 NULL, &devices);
399 if (ACPI_FAILURE(status)) {
400 pr_warn(PREFIX "Invalid passive threshold\n");
401 tz->trips.passive.flags.valid = 0;
402 }
403 else
404 tz->trips.passive.flags.valid = 1;
405
406 if (memcmp(&tz->trips.passive.devices, &devices,
407 sizeof(struct acpi_handle_list))) {
408 memcpy(&tz->trips.passive.devices, &devices,
409 sizeof(struct acpi_handle_list));
410 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
411 }
412 }
413 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
414 if (valid != tz->trips.passive.flags.valid)
415 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
416 }
417
418 /* Active (optional) */
419 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
420 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
421 valid = tz->trips.active[i].flags.valid;
422
423 if (act == -1)
424 break; /* disable all active trip points */
425
426 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
427 tz->trips.active[i].flags.valid)) {
428 status = acpi_evaluate_integer(tz->device->handle,
429 name, NULL, &tmp);
430 if (ACPI_FAILURE(status)) {
431 tz->trips.active[i].flags.valid = 0;
432 if (i == 0)
433 break;
434 if (act <= 0)
435 break;
436 if (i == 1)
437 tz->trips.active[0].temperature =
438 CELSIUS_TO_KELVIN(act);
439 else
440 /*
441 * Don't allow override higher than
442 * the next higher trip point
443 */
444 tz->trips.active[i - 1].temperature =
445 (tz->trips.active[i - 2].temperature <
446 CELSIUS_TO_KELVIN(act) ?
447 tz->trips.active[i - 2].temperature :
448 CELSIUS_TO_KELVIN(act));
449 break;
450 } else {
451 tz->trips.active[i].temperature = tmp;
452 tz->trips.active[i].flags.valid = 1;
453 }
454 }
455
456 name[2] = 'L';
457 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
458 memset(&devices, 0, sizeof(struct acpi_handle_list));
459 status = acpi_evaluate_reference(tz->device->handle,
460 name, NULL, &devices);
461 if (ACPI_FAILURE(status)) {
462 pr_warn(PREFIX "Invalid active%d threshold\n",
463 i);
464 tz->trips.active[i].flags.valid = 0;
465 }
466 else
467 tz->trips.active[i].flags.valid = 1;
468
469 if (memcmp(&tz->trips.active[i].devices, &devices,
470 sizeof(struct acpi_handle_list))) {
471 memcpy(&tz->trips.active[i].devices, &devices,
472 sizeof(struct acpi_handle_list));
473 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
474 }
475 }
476 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
477 if (valid != tz->trips.active[i].flags.valid)
478 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
479
480 if (!tz->trips.active[i].flags.valid)
481 break;
482 }
483
484 if ((flag & ACPI_TRIPS_DEVICES)
485 && acpi_has_method(tz->device->handle, "_TZD")) {
486 memset(&devices, 0, sizeof(devices));
487 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
488 NULL, &devices);
489 if (ACPI_SUCCESS(status)
490 && memcmp(&tz->devices, &devices, sizeof(devices))) {
491 tz->devices = devices;
492 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
493 }
494 }
495
496 return 0;
497}
498
499static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
500{
501 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
502
503 if (ret)
504 return ret;
505
506 valid = tz->trips.critical.flags.valid |
507 tz->trips.hot.flags.valid |
508 tz->trips.passive.flags.valid;
509
510 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
511 valid |= tz->trips.active[i].flags.valid;
512
513 if (!valid) {
514 pr_warn(FW_BUG "No valid trip found\n");
515 return -ENODEV;
516 }
517 return 0;
518}
519
520static void acpi_thermal_check(void *data)
521{
522 struct acpi_thermal *tz = data;
523
524 if (!tz->tz_enabled)
525 return;
526
527 thermal_zone_device_update(tz->thermal_zone);
528}
529
530/* sys I/F for generic thermal sysfs support */
531#define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
532
533static int thermal_get_temp(struct thermal_zone_device *thermal,
534 unsigned long *temp)
535{
536 struct acpi_thermal *tz = thermal->devdata;
537 int result;
538
539 if (!tz)
540 return -EINVAL;
541
542 result = acpi_thermal_get_temperature(tz);
543 if (result)
544 return result;
545
546 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
547 return 0;
548}
549
550static int thermal_get_mode(struct thermal_zone_device *thermal,
551 enum thermal_device_mode *mode)
552{
553 struct acpi_thermal *tz = thermal->devdata;
554
555 if (!tz)
556 return -EINVAL;
557
558 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
559 THERMAL_DEVICE_DISABLED;
560
561 return 0;
562}
563
564static int thermal_set_mode(struct thermal_zone_device *thermal,
565 enum thermal_device_mode mode)
566{
567 struct acpi_thermal *tz = thermal->devdata;
568 int enable;
569
570 if (!tz)
571 return -EINVAL;
572
573 /*
574 * enable/disable thermal management from ACPI thermal driver
575 */
576 if (mode == THERMAL_DEVICE_ENABLED)
577 enable = 1;
578 else if (mode == THERMAL_DEVICE_DISABLED) {
579 enable = 0;
580 pr_warn("thermal zone will be disabled\n");
581 } else
582 return -EINVAL;
583
584 if (enable != tz->tz_enabled) {
585 tz->tz_enabled = enable;
586 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
587 "%s kernel ACPI thermal control\n",
588 tz->tz_enabled ? "Enable" : "Disable"));
589 acpi_thermal_check(tz);
590 }
591 return 0;
592}
593
594static int thermal_get_trip_type(struct thermal_zone_device *thermal,
595 int trip, enum thermal_trip_type *type)
596{
597 struct acpi_thermal *tz = thermal->devdata;
598 int i;
599
600 if (!tz || trip < 0)
601 return -EINVAL;
602
603 if (tz->trips.critical.flags.valid) {
604 if (!trip) {
605 *type = THERMAL_TRIP_CRITICAL;
606 return 0;
607 }
608 trip--;
609 }
610
611 if (tz->trips.hot.flags.valid) {
612 if (!trip) {
613 *type = THERMAL_TRIP_HOT;
614 return 0;
615 }
616 trip--;
617 }
618
619 if (tz->trips.passive.flags.valid) {
620 if (!trip) {
621 *type = THERMAL_TRIP_PASSIVE;
622 return 0;
623 }
624 trip--;
625 }
626
627 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
628 tz->trips.active[i].flags.valid; i++) {
629 if (!trip) {
630 *type = THERMAL_TRIP_ACTIVE;
631 return 0;
632 }
633 trip--;
634 }
635
636 return -EINVAL;
637}
638
639static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
640 int trip, unsigned long *temp)
641{
642 struct acpi_thermal *tz = thermal->devdata;
643 int i;
644
645 if (!tz || trip < 0)
646 return -EINVAL;
647
648 if (tz->trips.critical.flags.valid) {
649 if (!trip) {
650 *temp = KELVIN_TO_MILLICELSIUS(
651 tz->trips.critical.temperature,
652 tz->kelvin_offset);
653 return 0;
654 }
655 trip--;
656 }
657
658 if (tz->trips.hot.flags.valid) {
659 if (!trip) {
660 *temp = KELVIN_TO_MILLICELSIUS(
661 tz->trips.hot.temperature,
662 tz->kelvin_offset);
663 return 0;
664 }
665 trip--;
666 }
667
668 if (tz->trips.passive.flags.valid) {
669 if (!trip) {
670 *temp = KELVIN_TO_MILLICELSIUS(
671 tz->trips.passive.temperature,
672 tz->kelvin_offset);
673 return 0;
674 }
675 trip--;
676 }
677
678 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
679 tz->trips.active[i].flags.valid; i++) {
680 if (!trip) {
681 *temp = KELVIN_TO_MILLICELSIUS(
682 tz->trips.active[i].temperature,
683 tz->kelvin_offset);
684 return 0;
685 }
686 trip--;
687 }
688
689 return -EINVAL;
690}
691
692static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
693 unsigned long *temperature) {
694 struct acpi_thermal *tz = thermal->devdata;
695
696 if (tz->trips.critical.flags.valid) {
697 *temperature = KELVIN_TO_MILLICELSIUS(
698 tz->trips.critical.temperature,
699 tz->kelvin_offset);
700 return 0;
701 } else
702 return -EINVAL;
703}
704
705static int thermal_get_trend(struct thermal_zone_device *thermal,
706 int trip, enum thermal_trend *trend)
707{
708 struct acpi_thermal *tz = thermal->devdata;
709 enum thermal_trip_type type;
710 int i;
711
712 if (thermal_get_trip_type(thermal, trip, &type))
713 return -EINVAL;
714
715 if (type == THERMAL_TRIP_ACTIVE) {
716 unsigned long trip_temp;
717 unsigned long temp = KELVIN_TO_MILLICELSIUS(tz->temperature,
718 tz->kelvin_offset);
719 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
720 return -EINVAL;
721
722 if (temp > trip_temp) {
723 *trend = THERMAL_TREND_RAISING;
724 return 0;
725 } else {
726 /* Fall back on default trend */
727 return -EINVAL;
728 }
729 }
730
731 /*
732 * tz->temperature has already been updated by generic thermal layer,
733 * before this callback being invoked
734 */
735 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
736 + (tz->trips.passive.tc2
737 * (tz->temperature - tz->trips.passive.temperature));
738
739 if (i > 0)
740 *trend = THERMAL_TREND_RAISING;
741 else if (i < 0)
742 *trend = THERMAL_TREND_DROPPING;
743 else
744 *trend = THERMAL_TREND_STABLE;
745 return 0;
746}
747
748
749static int thermal_notify(struct thermal_zone_device *thermal, int trip,
750 enum thermal_trip_type trip_type)
751{
752 u8 type = 0;
753 struct acpi_thermal *tz = thermal->devdata;
754
755 if (trip_type == THERMAL_TRIP_CRITICAL)
756 type = ACPI_THERMAL_NOTIFY_CRITICAL;
757 else if (trip_type == THERMAL_TRIP_HOT)
758 type = ACPI_THERMAL_NOTIFY_HOT;
759 else
760 return 0;
761
762 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
763 dev_name(&tz->device->dev), type, 1);
764
765 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
766 return 1;
767
768 return 0;
769}
770
771static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
772 struct thermal_cooling_device *cdev,
773 bool bind)
774{
775 struct acpi_device *device = cdev->devdata;
776 struct acpi_thermal *tz = thermal->devdata;
777 struct acpi_device *dev;
778 acpi_status status;
779 acpi_handle handle;
780 int i;
781 int j;
782 int trip = -1;
783 int result = 0;
784
785 if (tz->trips.critical.flags.valid)
786 trip++;
787
788 if (tz->trips.hot.flags.valid)
789 trip++;
790
791 if (tz->trips.passive.flags.valid) {
792 trip++;
793 for (i = 0; i < tz->trips.passive.devices.count;
794 i++) {
795 handle = tz->trips.passive.devices.handles[i];
796 status = acpi_bus_get_device(handle, &dev);
797 if (ACPI_FAILURE(status) || dev != device)
798 continue;
799 if (bind)
800 result =
801 thermal_zone_bind_cooling_device
802 (thermal, trip, cdev,
803 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
804 else
805 result =
806 thermal_zone_unbind_cooling_device
807 (thermal, trip, cdev);
808 if (result)
809 goto failed;
810 }
811 }
812
813 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
814 if (!tz->trips.active[i].flags.valid)
815 break;
816 trip++;
817 for (j = 0;
818 j < tz->trips.active[i].devices.count;
819 j++) {
820 handle = tz->trips.active[i].devices.handles[j];
821 status = acpi_bus_get_device(handle, &dev);
822 if (ACPI_FAILURE(status) || dev != device)
823 continue;
824 if (bind)
825 result = thermal_zone_bind_cooling_device
826 (thermal, trip, cdev,
827 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
828 else
829 result = thermal_zone_unbind_cooling_device
830 (thermal, trip, cdev);
831 if (result)
832 goto failed;
833 }
834 }
835
836 for (i = 0; i < tz->devices.count; i++) {
837 handle = tz->devices.handles[i];
838 status = acpi_bus_get_device(handle, &dev);
839 if (ACPI_SUCCESS(status) && (dev == device)) {
840 if (bind)
841 result = thermal_zone_bind_cooling_device
842 (thermal, THERMAL_TRIPS_NONE,
843 cdev, THERMAL_NO_LIMIT,
844 THERMAL_NO_LIMIT);
845 else
846 result = thermal_zone_unbind_cooling_device
847 (thermal, THERMAL_TRIPS_NONE,
848 cdev);
849 if (result)
850 goto failed;
851 }
852 }
853
854failed:
855 return result;
856}
857
858static int
859acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
860 struct thermal_cooling_device *cdev)
861{
862 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
863}
864
865static int
866acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
867 struct thermal_cooling_device *cdev)
868{
869 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
870}
871
872static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
873 .bind = acpi_thermal_bind_cooling_device,
874 .unbind = acpi_thermal_unbind_cooling_device,
875 .get_temp = thermal_get_temp,
876 .get_mode = thermal_get_mode,
877 .set_mode = thermal_set_mode,
878 .get_trip_type = thermal_get_trip_type,
879 .get_trip_temp = thermal_get_trip_temp,
880 .get_crit_temp = thermal_get_crit_temp,
881 .get_trend = thermal_get_trend,
882 .notify = thermal_notify,
883};
884
885static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
886{
887 int trips = 0;
888 int result;
889 acpi_status status;
890 int i;
891
892 if (tz->trips.critical.flags.valid)
893 trips++;
894
895 if (tz->trips.hot.flags.valid)
896 trips++;
897
898 if (tz->trips.passive.flags.valid)
899 trips++;
900
901 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
902 tz->trips.active[i].flags.valid; i++, trips++);
903
904 if (tz->trips.passive.flags.valid)
905 tz->thermal_zone =
906 thermal_zone_device_register("acpitz", trips, 0, tz,
907 &acpi_thermal_zone_ops, NULL,
908 tz->trips.passive.tsp*100,
909 tz->polling_frequency*100);
910 else
911 tz->thermal_zone =
912 thermal_zone_device_register("acpitz", trips, 0, tz,
913 &acpi_thermal_zone_ops, NULL,
914 0, tz->polling_frequency*100);
915 if (IS_ERR(tz->thermal_zone))
916 return -ENODEV;
917
918 result = sysfs_create_link(&tz->device->dev.kobj,
919 &tz->thermal_zone->device.kobj, "thermal_zone");
920 if (result)
921 return result;
922
923 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
924 &tz->device->dev.kobj, "device");
925 if (result)
926 return result;
927
928 status = acpi_attach_data(tz->device->handle,
929 acpi_bus_private_data_handler,
930 tz->thermal_zone);
931 if (ACPI_FAILURE(status)) {
932 pr_err(PREFIX "Error attaching device data\n");
933 return -ENODEV;
934 }
935
936 tz->tz_enabled = 1;
937
938 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
939 tz->thermal_zone->id);
940 return 0;
941}
942
943static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
944{
945 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
946 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
947 thermal_zone_device_unregister(tz->thermal_zone);
948 tz->thermal_zone = NULL;
949 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
950}
951
952
953/* --------------------------------------------------------------------------
954 Driver Interface
955 -------------------------------------------------------------------------- */
956
957static void acpi_thermal_notify(struct acpi_device *device, u32 event)
958{
959 struct acpi_thermal *tz = acpi_driver_data(device);
960
961
962 if (!tz)
963 return;
964
965 switch (event) {
966 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
967 acpi_thermal_check(tz);
968 break;
969 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
970 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
971 acpi_thermal_check(tz);
972 acpi_bus_generate_netlink_event(device->pnp.device_class,
973 dev_name(&device->dev), event, 0);
974 break;
975 case ACPI_THERMAL_NOTIFY_DEVICES:
976 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
977 acpi_thermal_check(tz);
978 acpi_bus_generate_netlink_event(device->pnp.device_class,
979 dev_name(&device->dev), event, 0);
980 break;
981 default:
982 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
983 "Unsupported event [0x%x]\n", event));
984 break;
985 }
986}
987
988/*
989 * On some platforms, the AML code has dependency about
990 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
991 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
992 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
993 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
994 * if _TMP has never been evaluated.
995 *
996 * As this dependency is totally transparent to OS, evaluate
997 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
998 * _TMP, before they are actually used.
999 */
1000static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
1001{
1002 acpi_handle handle = tz->device->handle;
1003 unsigned long long value;
1004 int i;
1005
1006 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1007 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1008 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1009 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1010 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1011 acpi_status status;
1012
1013 status = acpi_evaluate_integer(handle, name, NULL, &value);
1014 if (status == AE_NOT_FOUND)
1015 break;
1016 }
1017 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1018}
1019
1020static int acpi_thermal_get_info(struct acpi_thermal *tz)
1021{
1022 int result = 0;
1023
1024
1025 if (!tz)
1026 return -EINVAL;
1027
1028 acpi_thermal_aml_dependency_fix(tz);
1029
1030 /* Get trip points [_CRT, _PSV, etc.] (required) */
1031 result = acpi_thermal_get_trip_points(tz);
1032 if (result)
1033 return result;
1034
1035 /* Get temperature [_TMP] (required) */
1036 result = acpi_thermal_get_temperature(tz);
1037 if (result)
1038 return result;
1039
1040 /* Set the cooling mode [_SCP] to active cooling (default) */
1041 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1042 if (!result)
1043 tz->flags.cooling_mode = 1;
1044
1045 /* Get default polling frequency [_TZP] (optional) */
1046 if (tzp)
1047 tz->polling_frequency = tzp;
1048 else
1049 acpi_thermal_get_polling_frequency(tz);
1050
1051 return 0;
1052}
1053
1054/*
1055 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1056 * handles temperature values with a single decimal place. As a consequence,
1057 * some implementations use an offset of 273.1 and others use an offset of
1058 * 273.2. Try to find out which one is being used, to present the most
1059 * accurate and visually appealing number.
1060 *
1061 * The heuristic below should work for all ACPI thermal zones which have a
1062 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1063 */
1064static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1065{
1066 if (tz->trips.critical.flags.valid &&
1067 (tz->trips.critical.temperature % 5) == 1)
1068 tz->kelvin_offset = 2731;
1069 else
1070 tz->kelvin_offset = 2732;
1071}
1072
1073static void acpi_thermal_check_fn(struct work_struct *work)
1074{
1075 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1076 thermal_check_work);
1077 acpi_thermal_check(tz);
1078}
1079
1080static int acpi_thermal_add(struct acpi_device *device)
1081{
1082 int result = 0;
1083 struct acpi_thermal *tz = NULL;
1084
1085
1086 if (!device)
1087 return -EINVAL;
1088
1089 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1090 if (!tz)
1091 return -ENOMEM;
1092
1093 tz->device = device;
1094 strcpy(tz->name, device->pnp.bus_id);
1095 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1096 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1097 device->driver_data = tz;
1098
1099 result = acpi_thermal_get_info(tz);
1100 if (result)
1101 goto free_memory;
1102
1103 acpi_thermal_guess_offset(tz);
1104
1105 result = acpi_thermal_register_thermal_zone(tz);
1106 if (result)
1107 goto free_memory;
1108
1109 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1110
1111 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1112 acpi_device_bid(device), KELVIN_TO_CELSIUS(tz->temperature));
1113 goto end;
1114
1115free_memory:
1116 kfree(tz);
1117end:
1118 return result;
1119}
1120
1121static int acpi_thermal_remove(struct acpi_device *device)
1122{
1123 struct acpi_thermal *tz = NULL;
1124
1125 if (!device || !acpi_driver_data(device))
1126 return -EINVAL;
1127
1128 flush_workqueue(acpi_thermal_pm_queue);
1129 tz = acpi_driver_data(device);
1130
1131 acpi_thermal_unregister_thermal_zone(tz);
1132 kfree(tz);
1133 return 0;
1134}
1135
1136#ifdef CONFIG_PM_SLEEP
1137static int acpi_thermal_suspend(struct device *dev)
1138{
1139 /* Make sure the previously queued thermal check work has been done */
1140 flush_workqueue(acpi_thermal_pm_queue);
1141 return 0;
1142}
1143
1144static int acpi_thermal_resume(struct device *dev)
1145{
1146 struct acpi_thermal *tz;
1147 int i, j, power_state, result;
1148
1149 if (!dev)
1150 return -EINVAL;
1151
1152 tz = acpi_driver_data(to_acpi_device(dev));
1153 if (!tz)
1154 return -EINVAL;
1155
1156 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1157 if (!(&tz->trips.active[i]))
1158 break;
1159 if (!tz->trips.active[i].flags.valid)
1160 break;
1161 tz->trips.active[i].flags.enabled = 1;
1162 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1163 result = acpi_bus_update_power(
1164 tz->trips.active[i].devices.handles[j],
1165 &power_state);
1166 if (result || (power_state != ACPI_STATE_D0)) {
1167 tz->trips.active[i].flags.enabled = 0;
1168 break;
1169 }
1170 }
1171 tz->state.active |= tz->trips.active[i].flags.enabled;
1172 }
1173
1174 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1175
1176 return AE_OK;
1177}
1178#endif
1179
1180static int thermal_act(const struct dmi_system_id *d) {
1181
1182 if (act == 0) {
1183 pr_notice(PREFIX "%s detected: "
1184 "disabling all active thermal trip points\n", d->ident);
1185 act = -1;
1186 }
1187 return 0;
1188}
1189static int thermal_nocrt(const struct dmi_system_id *d) {
1190
1191 pr_notice(PREFIX "%s detected: "
1192 "disabling all critical thermal trip point actions.\n", d->ident);
1193 nocrt = 1;
1194 return 0;
1195}
1196static int thermal_tzp(const struct dmi_system_id *d) {
1197
1198 if (tzp == 0) {
1199 pr_notice(PREFIX "%s detected: "
1200 "enabling thermal zone polling\n", d->ident);
1201 tzp = 300; /* 300 dS = 30 Seconds */
1202 }
1203 return 0;
1204}
1205static int thermal_psv(const struct dmi_system_id *d) {
1206
1207 if (psv == 0) {
1208 pr_notice(PREFIX "%s detected: "
1209 "disabling all passive thermal trip points\n", d->ident);
1210 psv = -1;
1211 }
1212 return 0;
1213}
1214
1215static struct dmi_system_id thermal_dmi_table[] __initdata = {
1216 /*
1217 * Award BIOS on this AOpen makes thermal control almost worthless.
1218 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1219 */
1220 {
1221 .callback = thermal_act,
1222 .ident = "AOpen i915GMm-HFS",
1223 .matches = {
1224 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1225 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1226 },
1227 },
1228 {
1229 .callback = thermal_psv,
1230 .ident = "AOpen i915GMm-HFS",
1231 .matches = {
1232 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1233 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1234 },
1235 },
1236 {
1237 .callback = thermal_tzp,
1238 .ident = "AOpen i915GMm-HFS",
1239 .matches = {
1240 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1241 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1242 },
1243 },
1244 {
1245 .callback = thermal_nocrt,
1246 .ident = "Gigabyte GA-7ZX",
1247 .matches = {
1248 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1249 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1250 },
1251 },
1252 {}
1253};
1254
1255static int __init acpi_thermal_init(void)
1256{
1257 int result = 0;
1258
1259 dmi_check_system(thermal_dmi_table);
1260
1261 if (off) {
1262 pr_notice(PREFIX "thermal control disabled\n");
1263 return -ENODEV;
1264 }
1265
1266 acpi_thermal_pm_queue = create_workqueue("acpi_thermal_pm");
1267 if (!acpi_thermal_pm_queue)
1268 return -ENODEV;
1269
1270 result = acpi_bus_register_driver(&acpi_thermal_driver);
1271 if (result < 0) {
1272 destroy_workqueue(acpi_thermal_pm_queue);
1273 return -ENODEV;
1274 }
1275
1276 return 0;
1277}
1278
1279static void __exit acpi_thermal_exit(void)
1280{
1281 acpi_bus_unregister_driver(&acpi_thermal_driver);
1282 destroy_workqueue(acpi_thermal_pm_queue);
1283
1284 return;
1285}
1286
1287module_init(acpi_thermal_init);
1288module_exit(acpi_thermal_exit);