-
Notifications
You must be signed in to change notification settings - Fork 115
/
Copy paththermal.c
1179 lines (1003 loc) · 29.4 KB
/
thermal.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This driver fully implements the ACPI thermal policy as described in the
* ACPI 2.0 Specification.
*
* TBD: 1. Implement passive cooling hysteresis.
* 2. Enhance passive cooling (CPU) states/limit interface to support
* concepts of 'multiple limiters', upper/lower limits, etc.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/jiffies.h>
#include <linux/kmod.h>
#include <linux/reboot.h>
#include <linux/device.h>
#include <asm/uaccess.h>
#include <linux/thermal.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define PREFIX "ACPI: "
#define ACPI_THERMAL_CLASS "thermal_zone"
#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
#define ACPI_THERMAL_FILE_STATE "state"
#define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
#define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
#define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
#define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
#define ACPI_THERMAL_NOTIFY_HOT 0xF1
#define ACPI_THERMAL_MODE_ACTIVE 0x00
#define ACPI_THERMAL_MAX_ACTIVE 10
#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
#define _COMPONENT ACPI_THERMAL_COMPONENT
ACPI_MODULE_NAME("thermal");
MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
MODULE_LICENSE("GPL");
static int act;
module_param(act, int, 0644);
MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
static int crt;
module_param(crt, int, 0644);
MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
static int tzp;
module_param(tzp, int, 0444);
MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
static int nocrt;
module_param(nocrt, int, 0);
MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
static int off;
module_param(off, int, 0);
MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
static int psv;
module_param(psv, int, 0644);
MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
static int acpi_thermal_add(struct acpi_device *device);
static int acpi_thermal_remove(struct acpi_device *device, int type);
static int acpi_thermal_resume(struct acpi_device *device);
static void acpi_thermal_notify(struct acpi_device *device, u32 event);
static const struct acpi_device_id thermal_device_ids[] = {
{ACPI_THERMAL_HID, 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
static struct acpi_driver acpi_thermal_driver = {
.name = "thermal",
.class = ACPI_THERMAL_CLASS,
.ids = thermal_device_ids,
.ops = {
.add = acpi_thermal_add,
.remove = acpi_thermal_remove,
.resume = acpi_thermal_resume,
.notify = acpi_thermal_notify,
},
};
struct acpi_thermal_state {
u8 critical:1;
u8 hot:1;
u8 passive:1;
u8 active:1;
u8 reserved:4;
int active_index;
};
struct acpi_thermal_state_flags {
u8 valid:1;
u8 enabled:1;
u8 reserved:6;
};
struct acpi_thermal_critical {
struct acpi_thermal_state_flags flags;
unsigned long temperature;
};
struct acpi_thermal_hot {
struct acpi_thermal_state_flags flags;
unsigned long temperature;
};
struct acpi_thermal_passive {
struct acpi_thermal_state_flags flags;
unsigned long temperature;
unsigned long tc1;
unsigned long tc2;
unsigned long tsp;
struct acpi_handle_list devices;
};
struct acpi_thermal_active {
struct acpi_thermal_state_flags flags;
unsigned long temperature;
struct acpi_handle_list devices;
};
struct acpi_thermal_trips {
struct acpi_thermal_critical critical;
struct acpi_thermal_hot hot;
struct acpi_thermal_passive passive;
struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
};
struct acpi_thermal_flags {
u8 cooling_mode:1; /* _SCP */
u8 devices:1; /* _TZD */
u8 reserved:6;
};
struct acpi_thermal {
struct acpi_device * device;
acpi_bus_id name;
unsigned long temperature;
unsigned long last_temperature;
unsigned long polling_frequency;
volatile u8 zombie;
struct acpi_thermal_flags flags;
struct acpi_thermal_state state;
struct acpi_thermal_trips trips;
struct acpi_handle_list devices;
struct thermal_zone_device *thermal_zone;
int tz_enabled;
int kelvin_offset;
struct mutex lock;
};
/* --------------------------------------------------------------------------
Thermal Zone Management
-------------------------------------------------------------------------- */
static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
{
acpi_status status = AE_OK;
unsigned long long tmp;
if (!tz)
return -EINVAL;
tz->last_temperature = tz->temperature;
status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
if (ACPI_FAILURE(status))
return -ENODEV;
tz->temperature = tmp;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
tz->temperature));
return 0;
}
static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
{
acpi_status status = AE_OK;
unsigned long long tmp;
if (!tz)
return -EINVAL;
status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
if (ACPI_FAILURE(status))
return -ENODEV;
tz->polling_frequency = tmp;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
tz->polling_frequency));
return 0;
}
static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
{
acpi_status status = AE_OK;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list arg_list = { 1, &arg0 };
acpi_handle handle = NULL;
if (!tz)
return -EINVAL;
status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
return -ENODEV;
}
arg0.integer.value = mode;
status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
if (ACPI_FAILURE(status))
return -ENODEV;
return 0;
}
#define ACPI_TRIPS_CRITICAL 0x01
#define ACPI_TRIPS_HOT 0x02
#define ACPI_TRIPS_PASSIVE 0x04
#define ACPI_TRIPS_ACTIVE 0x08
#define ACPI_TRIPS_DEVICES 0x10
#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
ACPI_TRIPS_DEVICES)
/*
* This exception is thrown out in two cases:
* 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
* when re-evaluating the AML code.
* 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
* We need to re-bind the cooling devices of a thermal zone when this occurs.
*/
#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
do { \
if (flags != ACPI_TRIPS_INIT) \
ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
"ACPI thermal trip point %s changed\n" \
"Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
} while (0)
static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
{
acpi_status status = AE_OK;
unsigned long long tmp;
struct acpi_handle_list devices;
int valid = 0;
int i;
/* Critical Shutdown */
if (flag & ACPI_TRIPS_CRITICAL) {
status = acpi_evaluate_integer(tz->device->handle,
"_CRT", NULL, &tmp);
tz->trips.critical.temperature = tmp;
/*
* Treat freezing temperatures as invalid as well; some
* BIOSes return really low values and cause reboots at startup.
* Below zero (Celsius) values clearly aren't right for sure..
* ... so lets discard those as invalid.
*/
if (ACPI_FAILURE(status)) {
tz->trips.critical.flags.valid = 0;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"No critical threshold\n"));
} else if (tmp <= 2732) {
printk(KERN_WARNING FW_BUG "Invalid critical threshold "
"(%llu)\n", tmp);
tz->trips.critical.flags.valid = 0;
} else {
tz->trips.critical.flags.valid = 1;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Found critical threshold [%lu]\n",
tz->trips.critical.temperature));
}
if (tz->trips.critical.flags.valid == 1) {
if (crt == -1) {
tz->trips.critical.flags.valid = 0;
} else if (crt > 0) {
unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
/*
* Allow override critical threshold
*/
if (crt_k > tz->trips.critical.temperature)
printk(KERN_WARNING PREFIX
"Critical threshold %d C\n", crt);
tz->trips.critical.temperature = crt_k;
}
}
}
/* Critical Sleep (optional) */
if (flag & ACPI_TRIPS_HOT) {
status = acpi_evaluate_integer(tz->device->handle,
"_HOT", NULL, &tmp);
if (ACPI_FAILURE(status)) {
tz->trips.hot.flags.valid = 0;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"No hot threshold\n"));
} else {
tz->trips.hot.temperature = tmp;
tz->trips.hot.flags.valid = 1;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Found hot threshold [%lu]\n",
tz->trips.critical.temperature));
}
}
/* Passive (optional) */
if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
(flag == ACPI_TRIPS_INIT)) {
valid = tz->trips.passive.flags.valid;
if (psv == -1) {
status = AE_SUPPORT;
} else if (psv > 0) {
tmp = CELSIUS_TO_KELVIN(psv);
status = AE_OK;
} else {
status = acpi_evaluate_integer(tz->device->handle,
"_PSV", NULL, &tmp);
}
if (ACPI_FAILURE(status))
tz->trips.passive.flags.valid = 0;
else {
tz->trips.passive.temperature = tmp;
tz->trips.passive.flags.valid = 1;
if (flag == ACPI_TRIPS_INIT) {
status = acpi_evaluate_integer(
tz->device->handle, "_TC1",
NULL, &tmp);
if (ACPI_FAILURE(status))
tz->trips.passive.flags.valid = 0;
else
tz->trips.passive.tc1 = tmp;
status = acpi_evaluate_integer(
tz->device->handle, "_TC2",
NULL, &tmp);
if (ACPI_FAILURE(status))
tz->trips.passive.flags.valid = 0;
else
tz->trips.passive.tc2 = tmp;
status = acpi_evaluate_integer(
tz->device->handle, "_TSP",
NULL, &tmp);
if (ACPI_FAILURE(status))
tz->trips.passive.flags.valid = 0;
else
tz->trips.passive.tsp = tmp;
}
}
}
if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
memset(&devices, 0, sizeof(struct acpi_handle_list));
status = acpi_evaluate_reference(tz->device->handle, "_PSL",
NULL, &devices);
if (ACPI_FAILURE(status)) {
printk(KERN_WARNING PREFIX
"Invalid passive threshold\n");
tz->trips.passive.flags.valid = 0;
}
else
tz->trips.passive.flags.valid = 1;
if (memcmp(&tz->trips.passive.devices, &devices,
sizeof(struct acpi_handle_list))) {
memcpy(&tz->trips.passive.devices, &devices,
sizeof(struct acpi_handle_list));
ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
}
}
if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
if (valid != tz->trips.passive.flags.valid)
ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
}
/* Active (optional) */
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
valid = tz->trips.active[i].flags.valid;
if (act == -1)
break; /* disable all active trip points */
if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
tz->trips.active[i].flags.valid)) {
status = acpi_evaluate_integer(tz->device->handle,
name, NULL, &tmp);
if (ACPI_FAILURE(status)) {
tz->trips.active[i].flags.valid = 0;
if (i == 0)
break;
if (act <= 0)
break;
if (i == 1)
tz->trips.active[0].temperature =
CELSIUS_TO_KELVIN(act);
else
/*
* Don't allow override higher than
* the next higher trip point
*/
tz->trips.active[i - 1].temperature =
(tz->trips.active[i - 2].temperature <
CELSIUS_TO_KELVIN(act) ?
tz->trips.active[i - 2].temperature :
CELSIUS_TO_KELVIN(act));
break;
} else {
tz->trips.active[i].temperature = tmp;
tz->trips.active[i].flags.valid = 1;
}
}
name[2] = 'L';
if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
memset(&devices, 0, sizeof(struct acpi_handle_list));
status = acpi_evaluate_reference(tz->device->handle,
name, NULL, &devices);
if (ACPI_FAILURE(status)) {
printk(KERN_WARNING PREFIX
"Invalid active%d threshold\n", i);
tz->trips.active[i].flags.valid = 0;
}
else
tz->trips.active[i].flags.valid = 1;
if (memcmp(&tz->trips.active[i].devices, &devices,
sizeof(struct acpi_handle_list))) {
memcpy(&tz->trips.active[i].devices, &devices,
sizeof(struct acpi_handle_list));
ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
}
}
if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
if (valid != tz->trips.active[i].flags.valid)
ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
if (!tz->trips.active[i].flags.valid)
break;
}
if (flag & ACPI_TRIPS_DEVICES) {
memset(&devices, 0, sizeof(struct acpi_handle_list));
status = acpi_evaluate_reference(tz->device->handle, "_TZD",
NULL, &devices);
if (memcmp(&tz->devices, &devices,
sizeof(struct acpi_handle_list))) {
memcpy(&tz->devices, &devices,
sizeof(struct acpi_handle_list));
ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
}
}
return 0;
}
static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
{
int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
if (ret)
return ret;
valid = tz->trips.critical.flags.valid |
tz->trips.hot.flags.valid |
tz->trips.passive.flags.valid;
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
valid |= tz->trips.active[i].flags.valid;
if (!valid) {
printk(KERN_WARNING FW_BUG "No valid trip found\n");
return -ENODEV;
}
return 0;
}
static void acpi_thermal_check(void *data)
{
struct acpi_thermal *tz = data;
thermal_zone_device_update(tz->thermal_zone);
}
/* sys I/F for generic thermal sysfs support */
#define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
static int thermal_get_temp(struct thermal_zone_device *thermal,
unsigned long *temp)
{
struct acpi_thermal *tz = thermal->devdata;
int result;
if (!tz)
return -EINVAL;
result = acpi_thermal_get_temperature(tz);
if (result)
return result;
*temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
return 0;
}
static const char enabled[] = "kernel";
static const char disabled[] = "user";
static int thermal_get_mode(struct thermal_zone_device *thermal,
enum thermal_device_mode *mode)
{
struct acpi_thermal *tz = thermal->devdata;
if (!tz)
return -EINVAL;
*mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
THERMAL_DEVICE_DISABLED;
return 0;
}
static int thermal_set_mode(struct thermal_zone_device *thermal,
enum thermal_device_mode mode)
{
struct acpi_thermal *tz = thermal->devdata;
int enable;
if (!tz)
return -EINVAL;
/*
* enable/disable thermal management from ACPI thermal driver
*/
if (mode == THERMAL_DEVICE_ENABLED)
enable = 1;
else if (mode == THERMAL_DEVICE_DISABLED)
enable = 0;
else
return -EINVAL;
if (enable != tz->tz_enabled) {
tz->tz_enabled = enable;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"%s ACPI thermal control\n",
tz->tz_enabled ? enabled : disabled));
acpi_thermal_check(tz);
}
return 0;
}
static int thermal_get_trip_type(struct thermal_zone_device *thermal,
int trip, enum thermal_trip_type *type)
{
struct acpi_thermal *tz = thermal->devdata;
int i;
if (!tz || trip < 0)
return -EINVAL;
if (tz->trips.critical.flags.valid) {
if (!trip) {
*type = THERMAL_TRIP_CRITICAL;
return 0;
}
trip--;
}
if (tz->trips.hot.flags.valid) {
if (!trip) {
*type = THERMAL_TRIP_HOT;
return 0;
}
trip--;
}
if (tz->trips.passive.flags.valid) {
if (!trip) {
*type = THERMAL_TRIP_PASSIVE;
return 0;
}
trip--;
}
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
tz->trips.active[i].flags.valid; i++) {
if (!trip) {
*type = THERMAL_TRIP_ACTIVE;
return 0;
}
trip--;
}
return -EINVAL;
}
static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
int trip, unsigned long *temp)
{
struct acpi_thermal *tz = thermal->devdata;
int i;
if (!tz || trip < 0)
return -EINVAL;
if (tz->trips.critical.flags.valid) {
if (!trip) {
*temp = KELVIN_TO_MILLICELSIUS(
tz->trips.critical.temperature,
tz->kelvin_offset);
return 0;
}
trip--;
}
if (tz->trips.hot.flags.valid) {
if (!trip) {
*temp = KELVIN_TO_MILLICELSIUS(
tz->trips.hot.temperature,
tz->kelvin_offset);
return 0;
}
trip--;
}
if (tz->trips.passive.flags.valid) {
if (!trip) {
*temp = KELVIN_TO_MILLICELSIUS(
tz->trips.passive.temperature,
tz->kelvin_offset);
return 0;
}
trip--;
}
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
tz->trips.active[i].flags.valid; i++) {
if (!trip) {
*temp = KELVIN_TO_MILLICELSIUS(
tz->trips.active[i].temperature,
tz->kelvin_offset);
return 0;
}
trip--;
}
return -EINVAL;
}
static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
unsigned long *temperature) {
struct acpi_thermal *tz = thermal->devdata;
if (tz->trips.critical.flags.valid) {
*temperature = KELVIN_TO_MILLICELSIUS(
tz->trips.critical.temperature,
tz->kelvin_offset);
return 0;
} else
return -EINVAL;
}
static int thermal_notify(struct thermal_zone_device *thermal, int trip,
enum thermal_trip_type trip_type)
{
u8 type = 0;
struct acpi_thermal *tz = thermal->devdata;
if (trip_type == THERMAL_TRIP_CRITICAL)
type = ACPI_THERMAL_NOTIFY_CRITICAL;
else if (trip_type == THERMAL_TRIP_HOT)
type = ACPI_THERMAL_NOTIFY_HOT;
else
return 0;
acpi_bus_generate_proc_event(tz->device, type, 1);
acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
dev_name(&tz->device->dev), type, 1);
if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
return 1;
return 0;
}
typedef int (*cb)(struct thermal_zone_device *, int,
struct thermal_cooling_device *);
static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
struct thermal_cooling_device *cdev,
cb action)
{
struct acpi_device *device = cdev->devdata;
struct acpi_thermal *tz = thermal->devdata;
struct acpi_device *dev;
acpi_status status;
acpi_handle handle;
int i;
int j;
int trip = -1;
int result = 0;
if (tz->trips.critical.flags.valid)
trip++;
if (tz->trips.hot.flags.valid)
trip++;
if (tz->trips.passive.flags.valid) {
trip++;
for (i = 0; i < tz->trips.passive.devices.count;
i++) {
handle = tz->trips.passive.devices.handles[i];
status = acpi_bus_get_device(handle, &dev);
if (ACPI_SUCCESS(status) && (dev == device)) {
result = action(thermal, trip, cdev);
if (result)
goto failed;
}
}
}
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
if (!tz->trips.active[i].flags.valid)
break;
trip++;
for (j = 0;
j < tz->trips.active[i].devices.count;
j++) {
handle = tz->trips.active[i].devices.handles[j];
status = acpi_bus_get_device(handle, &dev);
if (ACPI_SUCCESS(status) && (dev == device)) {
result = action(thermal, trip, cdev);
if (result)
goto failed;
}
}
}
for (i = 0; i < tz->devices.count; i++) {
handle = tz->devices.handles[i];
status = acpi_bus_get_device(handle, &dev);
if (ACPI_SUCCESS(status) && (dev == device)) {
result = action(thermal, -1, cdev);
if (result)
goto failed;
}
}
failed:
return result;
}
static int
acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
struct thermal_cooling_device *cdev)
{
return acpi_thermal_cooling_device_cb(thermal, cdev,
thermal_zone_bind_cooling_device);
}
static int
acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
struct thermal_cooling_device *cdev)
{
return acpi_thermal_cooling_device_cb(thermal, cdev,
thermal_zone_unbind_cooling_device);
}
static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
.bind = acpi_thermal_bind_cooling_device,
.unbind = acpi_thermal_unbind_cooling_device,
.get_temp = thermal_get_temp,
.get_mode = thermal_get_mode,
.set_mode = thermal_set_mode,
.get_trip_type = thermal_get_trip_type,
.get_trip_temp = thermal_get_trip_temp,
.get_crit_temp = thermal_get_crit_temp,
.notify = thermal_notify,
};
static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
{
int trips = 0;
int result;
acpi_status status;
int i;
if (tz->trips.critical.flags.valid)
trips++;
if (tz->trips.hot.flags.valid)
trips++;
if (tz->trips.passive.flags.valid)
trips++;
for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
tz->trips.active[i].flags.valid; i++, trips++);
if (tz->trips.passive.flags.valid)
tz->thermal_zone =
thermal_zone_device_register("acpitz", trips, tz,
&acpi_thermal_zone_ops,
tz->trips.passive.tc1,
tz->trips.passive.tc2,
tz->trips.passive.tsp*100,
tz->polling_frequency*100);
else
tz->thermal_zone =
thermal_zone_device_register("acpitz", trips, tz,
&acpi_thermal_zone_ops,
0, 0, 0,
tz->polling_frequency*100);
if (IS_ERR(tz->thermal_zone))
return -ENODEV;
result = sysfs_create_link(&tz->device->dev.kobj,
&tz->thermal_zone->device.kobj, "thermal_zone");
if (result)
return result;
result = sysfs_create_link(&tz->thermal_zone->device.kobj,
&tz->device->dev.kobj, "device");
if (result)
return result;
status = acpi_attach_data(tz->device->handle,
acpi_bus_private_data_handler,
tz->thermal_zone);
if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX
"Error attaching device data\n");
return -ENODEV;
}
tz->tz_enabled = 1;
dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
tz->thermal_zone->id);
return 0;
}
static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
{
sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
thermal_zone_device_unregister(tz->thermal_zone);
tz->thermal_zone = NULL;
acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
static void acpi_thermal_notify(struct acpi_device *device, u32 event)
{
struct acpi_thermal *tz = acpi_driver_data(device);
if (!tz)
return;
switch (event) {
case ACPI_THERMAL_NOTIFY_TEMPERATURE:
acpi_thermal_check(tz);
break;
case ACPI_THERMAL_NOTIFY_THRESHOLDS:
acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
acpi_thermal_check(tz);
acpi_bus_generate_proc_event(device, event, 0);
acpi_bus_generate_netlink_event(device->pnp.device_class,
dev_name(&device->dev), event, 0);
break;
case ACPI_THERMAL_NOTIFY_DEVICES:
acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
acpi_thermal_check(tz);
acpi_bus_generate_proc_event(device, event, 0);
acpi_bus_generate_netlink_event(device->pnp.device_class,
dev_name(&device->dev), event, 0);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
}
static int acpi_thermal_get_info(struct acpi_thermal *tz)
{
int result = 0;
if (!tz)
return -EINVAL;
/* Get temperature [_TMP] (required) */
result = acpi_thermal_get_temperature(tz);
if (result)
return result;
/* Get trip points [_CRT, _PSV, etc.] (required) */
result = acpi_thermal_get_trip_points(tz);
if (result)
return result;
/* Set the cooling mode [_SCP] to active cooling (default) */
result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
if (!result)
tz->flags.cooling_mode = 1;
/* Get default polling frequency [_TZP] (optional) */
if (tzp)
tz->polling_frequency = tzp;
else
acpi_thermal_get_polling_frequency(tz);
return 0;
}
/*
* The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
* handles temperature values with a single decimal place. As a consequence,
* some implementations use an offset of 273.1 and others use an offset of
* 273.2. Try to find out which one is being used, to present the most
* accurate and visually appealing number.
*
* The heuristic below should work for all ACPI thermal zones which have a
* critical trip point with a value being a multiple of 0.5 degree Celsius.
*/
static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
{
if (tz->trips.critical.flags.valid &&
(tz->trips.critical.temperature % 5) == 1)
tz->kelvin_offset = 2731;
else
tz->kelvin_offset = 2732;
}
static int acpi_thermal_add(struct acpi_device *device)
{
int result = 0;
struct acpi_thermal *tz = NULL;
if (!device)
return -EINVAL;
tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
if (!tz)
return -ENOMEM;
tz->device = device;