forked from microsoft/WSL2-Linux-Kernel
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathlm90.c
1929 lines (1708 loc) · 50 KB
/
lm90.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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* lm90.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
* Copyright (C) 2003-2010 Jean Delvare <jdelvare@suse.de>
*
* Based on the lm83 driver. The LM90 is a sensor chip made by National
* Semiconductor. It reports up to two temperatures (its own plus up to
* one external one) with a 0.125 deg resolution (1 deg for local
* temperature) and a 3-4 deg accuracy.
*
* This driver also supports the LM89 and LM99, two other sensor chips
* made by National Semiconductor. Both have an increased remote
* temperature measurement accuracy (1 degree), and the LM99
* additionally shifts remote temperatures (measured and limits) by 16
* degrees, which allows for higher temperatures measurement.
* Note that there is no way to differentiate between both chips.
* When device is auto-detected, the driver will assume an LM99.
*
* This driver also supports the LM86, another sensor chip made by
* National Semiconductor. It is exactly similar to the LM90 except it
* has a higher accuracy.
*
* This driver also supports the ADM1032, a sensor chip made by Analog
* Devices. That chip is similar to the LM90, with a few differences
* that are not handled by this driver. Among others, it has a higher
* accuracy than the LM90, much like the LM86 does.
*
* This driver also supports the MAX6657, MAX6658 and MAX6659 sensor
* chips made by Maxim. These chips are similar to the LM86.
* Note that there is no easy way to differentiate between the three
* variants. We use the device address to detect MAX6659, which will result
* in a detection as max6657 if it is on address 0x4c. The extra address
* and features of the MAX6659 are only supported if the chip is configured
* explicitly as max6659, or if its address is not 0x4c.
* These chips lack the remote temperature offset feature.
*
* This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and
* MAX6692 chips made by Maxim. These are again similar to the LM86,
* but they use unsigned temperature values and can report temperatures
* from 0 to 145 degrees.
*
* This driver also supports the MAX6680 and MAX6681, two other sensor
* chips made by Maxim. These are quite similar to the other Maxim
* chips. The MAX6680 and MAX6681 only differ in the pinout so they can
* be treated identically.
*
* This driver also supports the MAX6695 and MAX6696, two other sensor
* chips made by Maxim. These are also quite similar to other Maxim
* chips, but support three temperature sensors instead of two. MAX6695
* and MAX6696 only differ in the pinout so they can be treated identically.
*
* This driver also supports ADT7461 and ADT7461A from Analog Devices as well as
* NCT1008 from ON Semiconductor. The chips are supported in both compatibility
* and extended mode. They are mostly compatible with LM90 except for a data
* format difference for the temperature value registers.
*
* This driver also supports the SA56004 from Philips. This device is
* pin-compatible with the LM86, the ED/EDP parts are also address-compatible.
*
* This driver also supports the G781 from GMT. This device is compatible
* with the ADM1032.
*
* This driver also supports TMP451 from Texas Instruments. This device is
* supported in both compatibility and extended mode. It's mostly compatible
* with ADT7461 except for local temperature low byte register and max
* conversion rate.
*
* Since the LM90 was the first chipset supported by this driver, most
* comments will refer to this chipset, but are actually general and
* concern all supported chipsets, unless mentioned otherwise.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/of_device.h>
#include <linux/sysfs.h>
#include <linux/interrupt.h>
#include <linux/regulator/consumer.h>
/*
* Addresses to scan
* Address is fully defined internally and cannot be changed except for
* MAX6659, MAX6680 and MAX6681.
* LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, ADT7461A, MAX6649,
* MAX6657, MAX6658, NCT1008 and W83L771 have address 0x4c.
* ADM1032-2, ADT7461-2, ADT7461A-2, LM89-1, LM99-1, MAX6646, and NCT1008D
* have address 0x4d.
* MAX6647 has address 0x4e.
* MAX6659 can have address 0x4c, 0x4d or 0x4e.
* MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,
* 0x4c, 0x4d or 0x4e.
* SA56004 can have address 0x48 through 0x4F.
*/
static const unsigned short normal_i2c[] = {
0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x48, 0x49, 0x4a, 0x4b, 0x4c,
0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
max6646, w83l771, max6696, sa56004, g781, tmp451 };
/*
* The LM90 registers
*/
#define LM90_REG_R_MAN_ID 0xFE
#define LM90_REG_R_CHIP_ID 0xFF
#define LM90_REG_R_CONFIG1 0x03
#define LM90_REG_W_CONFIG1 0x09
#define LM90_REG_R_CONFIG2 0xBF
#define LM90_REG_W_CONFIG2 0xBF
#define LM90_REG_R_CONVRATE 0x04
#define LM90_REG_W_CONVRATE 0x0A
#define LM90_REG_R_STATUS 0x02
#define LM90_REG_R_LOCAL_TEMP 0x00
#define LM90_REG_R_LOCAL_HIGH 0x05
#define LM90_REG_W_LOCAL_HIGH 0x0B
#define LM90_REG_R_LOCAL_LOW 0x06
#define LM90_REG_W_LOCAL_LOW 0x0C
#define LM90_REG_R_LOCAL_CRIT 0x20
#define LM90_REG_W_LOCAL_CRIT 0x20
#define LM90_REG_R_REMOTE_TEMPH 0x01
#define LM90_REG_R_REMOTE_TEMPL 0x10
#define LM90_REG_R_REMOTE_OFFSH 0x11
#define LM90_REG_W_REMOTE_OFFSH 0x11
#define LM90_REG_R_REMOTE_OFFSL 0x12
#define LM90_REG_W_REMOTE_OFFSL 0x12
#define LM90_REG_R_REMOTE_HIGHH 0x07
#define LM90_REG_W_REMOTE_HIGHH 0x0D
#define LM90_REG_R_REMOTE_HIGHL 0x13
#define LM90_REG_W_REMOTE_HIGHL 0x13
#define LM90_REG_R_REMOTE_LOWH 0x08
#define LM90_REG_W_REMOTE_LOWH 0x0E
#define LM90_REG_R_REMOTE_LOWL 0x14
#define LM90_REG_W_REMOTE_LOWL 0x14
#define LM90_REG_R_REMOTE_CRIT 0x19
#define LM90_REG_W_REMOTE_CRIT 0x19
#define LM90_REG_R_TCRIT_HYST 0x21
#define LM90_REG_W_TCRIT_HYST 0x21
/* MAX6646/6647/6649/6657/6658/6659/6695/6696 registers */
#define MAX6657_REG_R_LOCAL_TEMPL 0x11
#define MAX6696_REG_R_STATUS2 0x12
#define MAX6659_REG_R_REMOTE_EMERG 0x16
#define MAX6659_REG_W_REMOTE_EMERG 0x16
#define MAX6659_REG_R_LOCAL_EMERG 0x17
#define MAX6659_REG_W_LOCAL_EMERG 0x17
/* SA56004 registers */
#define SA56004_REG_R_LOCAL_TEMPL 0x22
#define LM90_MAX_CONVRATE_MS 16000 /* Maximum conversion rate in ms */
/* TMP451 registers */
#define TMP451_REG_R_LOCAL_TEMPL 0x15
/*
* Device flags
*/
#define LM90_FLAG_ADT7461_EXT (1 << 0) /* ADT7461 extended mode */
/* Device features */
#define LM90_HAVE_OFFSET (1 << 1) /* temperature offset register */
#define LM90_HAVE_REM_LIMIT_EXT (1 << 3) /* extended remote limit */
#define LM90_HAVE_EMERGENCY (1 << 4) /* 3rd upper (emergency) limit */
#define LM90_HAVE_EMERGENCY_ALARM (1 << 5)/* emergency alarm */
#define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */
#define LM90_HAVE_BROKEN_ALERT (1 << 7) /* Broken alert */
#define LM90_PAUSE_FOR_CONFIG (1 << 8) /* Pause conversion for config */
/* LM90 status */
#define LM90_STATUS_LTHRM (1 << 0) /* local THERM limit tripped */
#define LM90_STATUS_RTHRM (1 << 1) /* remote THERM limit tripped */
#define LM90_STATUS_ROPEN (1 << 2) /* remote is an open circuit */
#define LM90_STATUS_RLOW (1 << 3) /* remote low temp limit tripped */
#define LM90_STATUS_RHIGH (1 << 4) /* remote high temp limit tripped */
#define LM90_STATUS_LLOW (1 << 5) /* local low temp limit tripped */
#define LM90_STATUS_LHIGH (1 << 6) /* local high temp limit tripped */
#define MAX6696_STATUS2_R2THRM (1 << 1) /* remote2 THERM limit tripped */
#define MAX6696_STATUS2_R2OPEN (1 << 2) /* remote2 is an open circuit */
#define MAX6696_STATUS2_R2LOW (1 << 3) /* remote2 low temp limit tripped */
#define MAX6696_STATUS2_R2HIGH (1 << 4) /* remote2 high temp limit tripped */
#define MAX6696_STATUS2_ROT2 (1 << 5) /* remote emergency limit tripped */
#define MAX6696_STATUS2_R2OT2 (1 << 6) /* remote2 emergency limit tripped */
#define MAX6696_STATUS2_LOT2 (1 << 7) /* local emergency limit tripped */
/*
* Driver data (common to all clients)
*/
static const struct i2c_device_id lm90_id[] = {
{ "adm1032", adm1032 },
{ "adt7461", adt7461 },
{ "adt7461a", adt7461 },
{ "g781", g781 },
{ "lm90", lm90 },
{ "lm86", lm86 },
{ "lm89", lm86 },
{ "lm99", lm99 },
{ "max6646", max6646 },
{ "max6647", max6646 },
{ "max6649", max6646 },
{ "max6657", max6657 },
{ "max6658", max6657 },
{ "max6659", max6659 },
{ "max6680", max6680 },
{ "max6681", max6680 },
{ "max6695", max6696 },
{ "max6696", max6696 },
{ "nct1008", adt7461 },
{ "w83l771", w83l771 },
{ "sa56004", sa56004 },
{ "tmp451", tmp451 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm90_id);
static const struct of_device_id __maybe_unused lm90_of_match[] = {
{
.compatible = "adi,adm1032",
.data = (void *)adm1032
},
{
.compatible = "adi,adt7461",
.data = (void *)adt7461
},
{
.compatible = "adi,adt7461a",
.data = (void *)adt7461
},
{
.compatible = "gmt,g781",
.data = (void *)g781
},
{
.compatible = "national,lm90",
.data = (void *)lm90
},
{
.compatible = "national,lm86",
.data = (void *)lm86
},
{
.compatible = "national,lm89",
.data = (void *)lm86
},
{
.compatible = "national,lm99",
.data = (void *)lm99
},
{
.compatible = "dallas,max6646",
.data = (void *)max6646
},
{
.compatible = "dallas,max6647",
.data = (void *)max6646
},
{
.compatible = "dallas,max6649",
.data = (void *)max6646
},
{
.compatible = "dallas,max6657",
.data = (void *)max6657
},
{
.compatible = "dallas,max6658",
.data = (void *)max6657
},
{
.compatible = "dallas,max6659",
.data = (void *)max6659
},
{
.compatible = "dallas,max6680",
.data = (void *)max6680
},
{
.compatible = "dallas,max6681",
.data = (void *)max6680
},
{
.compatible = "dallas,max6695",
.data = (void *)max6696
},
{
.compatible = "dallas,max6696",
.data = (void *)max6696
},
{
.compatible = "onnn,nct1008",
.data = (void *)adt7461
},
{
.compatible = "winbond,w83l771",
.data = (void *)w83l771
},
{
.compatible = "nxp,sa56004",
.data = (void *)sa56004
},
{
.compatible = "ti,tmp451",
.data = (void *)tmp451
},
{ },
};
MODULE_DEVICE_TABLE(of, lm90_of_match);
/*
* chip type specific parameters
*/
struct lm90_params {
u32 flags; /* Capabilities */
u16 alert_alarms; /* Which alarm bits trigger ALERT# */
/* Upper 8 bits for max6695/96 */
u8 max_convrate; /* Maximum conversion rate register value */
u8 reg_local_ext; /* Extended local temp register (optional) */
};
static const struct lm90_params lm90_params[] = {
[adm1032] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
| LM90_HAVE_BROKEN_ALERT,
.alert_alarms = 0x7c,
.max_convrate = 10,
},
[adt7461] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
| LM90_HAVE_BROKEN_ALERT,
.alert_alarms = 0x7c,
.max_convrate = 10,
},
[g781] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
| LM90_HAVE_BROKEN_ALERT,
.alert_alarms = 0x7c,
.max_convrate = 8,
},
[lm86] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
.alert_alarms = 0x7b,
.max_convrate = 9,
},
[lm90] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
.alert_alarms = 0x7b,
.max_convrate = 9,
},
[lm99] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
.alert_alarms = 0x7b,
.max_convrate = 9,
},
[max6646] = {
.alert_alarms = 0x7c,
.max_convrate = 6,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[max6657] = {
.flags = LM90_PAUSE_FOR_CONFIG,
.alert_alarms = 0x7c,
.max_convrate = 8,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[max6659] = {
.flags = LM90_HAVE_EMERGENCY,
.alert_alarms = 0x7c,
.max_convrate = 8,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[max6680] = {
.flags = LM90_HAVE_OFFSET,
.alert_alarms = 0x7c,
.max_convrate = 7,
},
[max6696] = {
.flags = LM90_HAVE_EMERGENCY
| LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3,
.alert_alarms = 0x1c7c,
.max_convrate = 6,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[w83l771] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
.alert_alarms = 0x7c,
.max_convrate = 8,
},
[sa56004] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
.alert_alarms = 0x7b,
.max_convrate = 9,
.reg_local_ext = SA56004_REG_R_LOCAL_TEMPL,
},
[tmp451] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
| LM90_HAVE_BROKEN_ALERT,
.alert_alarms = 0x7c,
.max_convrate = 9,
.reg_local_ext = TMP451_REG_R_LOCAL_TEMPL,
},
};
/*
* TEMP8 register index
*/
enum lm90_temp8_reg_index {
LOCAL_LOW = 0,
LOCAL_HIGH,
LOCAL_CRIT,
REMOTE_CRIT,
LOCAL_EMERG, /* max6659 and max6695/96 */
REMOTE_EMERG, /* max6659 and max6695/96 */
REMOTE2_CRIT, /* max6695/96 only */
REMOTE2_EMERG, /* max6695/96 only */
TEMP8_REG_NUM
};
/*
* TEMP11 register index
*/
enum lm90_temp11_reg_index {
REMOTE_TEMP = 0,
REMOTE_LOW,
REMOTE_HIGH,
REMOTE_OFFSET, /* except max6646, max6657/58/59, and max6695/96 */
LOCAL_TEMP,
REMOTE2_TEMP, /* max6695/96 only */
REMOTE2_LOW, /* max6695/96 only */
REMOTE2_HIGH, /* max6695/96 only */
TEMP11_REG_NUM
};
/*
* Client data (each client gets its own)
*/
struct lm90_data {
struct i2c_client *client;
u32 channel_config[4];
struct hwmon_channel_info temp_info;
const struct hwmon_channel_info *info[3];
struct hwmon_chip_info chip;
struct mutex update_lock;
bool valid; /* true if register values are valid */
unsigned long last_updated; /* in jiffies */
int kind;
u32 flags;
unsigned int update_interval; /* in milliseconds */
u8 config; /* Current configuration register value */
u8 config_orig; /* Original configuration register value */
u8 convrate_orig; /* Original conversion rate register value */
u16 alert_alarms; /* Which alarm bits trigger ALERT# */
/* Upper 8 bits for max6695/96 */
u8 max_convrate; /* Maximum conversion rate */
u8 reg_local_ext; /* local extension register offset */
/* registers values */
s8 temp8[TEMP8_REG_NUM];
s16 temp11[TEMP11_REG_NUM];
u8 temp_hyst;
u16 alarms; /* bitvector (upper 8 bits for max6695/96) */
};
/*
* Support functions
*/
/*
* The ADM1032 supports PEC but not on write byte transactions, so we need
* to explicitly ask for a transaction without PEC.
*/
static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
{
return i2c_smbus_xfer(client->adapter, client->addr,
client->flags & ~I2C_CLIENT_PEC,
I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
}
/*
* It is assumed that client->update_lock is held (unless we are in
* detection or initialization steps). This matters when PEC is enabled,
* because we don't want the address pointer to change between the write
* byte and the read byte transactions.
*/
static int lm90_read_reg(struct i2c_client *client, u8 reg)
{
int err;
if (client->flags & I2C_CLIENT_PEC) {
err = adm1032_write_byte(client, reg);
if (err >= 0)
err = i2c_smbus_read_byte(client);
} else
err = i2c_smbus_read_byte_data(client, reg);
return err;
}
static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl)
{
int oldh, newh, l;
/*
* There is a trick here. We have to read two registers to have the
* sensor temperature, but we have to beware a conversion could occur
* between the readings. The datasheet says we should either use
* the one-shot conversion register, which we don't want to do
* (disables hardware monitoring) or monitor the busy bit, which is
* impossible (we can't read the values and monitor that bit at the
* exact same time). So the solution used here is to read the high
* byte once, then the low byte, then the high byte again. If the new
* high byte matches the old one, then we have a valid reading. Else
* we have to read the low byte again, and now we believe we have a
* correct reading.
*/
oldh = lm90_read_reg(client, regh);
if (oldh < 0)
return oldh;
l = lm90_read_reg(client, regl);
if (l < 0)
return l;
newh = lm90_read_reg(client, regh);
if (newh < 0)
return newh;
if (oldh != newh) {
l = lm90_read_reg(client, regl);
if (l < 0)
return l;
}
return (newh << 8) | l;
}
static int lm90_update_confreg(struct lm90_data *data, u8 config)
{
if (data->config != config) {
int err;
err = i2c_smbus_write_byte_data(data->client,
LM90_REG_W_CONFIG1,
config);
if (err)
return err;
data->config = config;
}
return 0;
}
/*
* client->update_lock must be held when calling this function (unless we are
* in detection or initialization steps), and while a remote channel other
* than channel 0 is selected. Also, calling code must make sure to re-select
* external channel 0 before releasing the lock. This is necessary because
* various registers have different meanings as a result of selecting a
* non-default remote channel.
*/
static int lm90_select_remote_channel(struct lm90_data *data, int channel)
{
int err = 0;
if (data->kind == max6696) {
u8 config = data->config & ~0x08;
if (channel)
config |= 0x08;
err = lm90_update_confreg(data, config);
}
return err;
}
static int lm90_write_convrate(struct lm90_data *data, int val)
{
u8 config = data->config;
int err;
/* Save config and pause conversion */
if (data->flags & LM90_PAUSE_FOR_CONFIG) {
err = lm90_update_confreg(data, config | 0x40);
if (err < 0)
return err;
}
/* Set conv rate */
err = i2c_smbus_write_byte_data(data->client, LM90_REG_W_CONVRATE, val);
/* Revert change to config */
lm90_update_confreg(data, config);
return err;
}
/*
* Set conversion rate.
* client->update_lock must be held when calling this function (unless we are
* in detection or initialization steps).
*/
static int lm90_set_convrate(struct i2c_client *client, struct lm90_data *data,
unsigned int interval)
{
unsigned int update_interval;
int i, err;
/* Shift calculations to avoid rounding errors */
interval <<= 6;
/* find the nearest update rate */
for (i = 0, update_interval = LM90_MAX_CONVRATE_MS << 6;
i < data->max_convrate; i++, update_interval >>= 1)
if (interval >= update_interval * 3 / 4)
break;
err = lm90_write_convrate(data, i);
data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64);
return err;
}
static int lm90_update_limits(struct device *dev)
{
struct lm90_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
int val;
val = lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT);
if (val < 0)
return val;
data->temp8[LOCAL_CRIT] = val;
val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT);
if (val < 0)
return val;
data->temp8[REMOTE_CRIT] = val;
val = lm90_read_reg(client, LM90_REG_R_TCRIT_HYST);
if (val < 0)
return val;
data->temp_hyst = val;
val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH);
if (val < 0)
return val;
data->temp11[REMOTE_LOW] = val << 8;
if (data->flags & LM90_HAVE_REM_LIMIT_EXT) {
val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL);
if (val < 0)
return val;
data->temp11[REMOTE_LOW] |= val;
}
val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH);
if (val < 0)
return val;
data->temp11[REMOTE_HIGH] = val << 8;
if (data->flags & LM90_HAVE_REM_LIMIT_EXT) {
val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL);
if (val < 0)
return val;
data->temp11[REMOTE_HIGH] |= val;
}
if (data->flags & LM90_HAVE_OFFSET) {
val = lm90_read16(client, LM90_REG_R_REMOTE_OFFSH,
LM90_REG_R_REMOTE_OFFSL);
if (val < 0)
return val;
data->temp11[REMOTE_OFFSET] = val;
}
if (data->flags & LM90_HAVE_EMERGENCY) {
val = lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG);
if (val < 0)
return val;
data->temp8[LOCAL_EMERG] = val;
val = lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG);
if (val < 0)
return val;
data->temp8[REMOTE_EMERG] = val;
}
if (data->kind == max6696) {
val = lm90_select_remote_channel(data, 1);
if (val < 0)
return val;
val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT);
if (val < 0)
return val;
data->temp8[REMOTE2_CRIT] = val;
val = lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG);
if (val < 0)
return val;
data->temp8[REMOTE2_EMERG] = val;
val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH);
if (val < 0)
return val;
data->temp11[REMOTE2_LOW] = val << 8;
val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH);
if (val < 0)
return val;
data->temp11[REMOTE2_HIGH] = val << 8;
lm90_select_remote_channel(data, 0);
}
return 0;
}
static int lm90_update_device(struct device *dev)
{
struct lm90_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
unsigned long next_update;
int val;
if (!data->valid) {
val = lm90_update_limits(dev);
if (val < 0)
return val;
}
next_update = data->last_updated +
msecs_to_jiffies(data->update_interval);
if (time_after(jiffies, next_update) || !data->valid) {
dev_dbg(&client->dev, "Updating lm90 data.\n");
data->valid = false;
val = lm90_read_reg(client, LM90_REG_R_LOCAL_LOW);
if (val < 0)
return val;
data->temp8[LOCAL_LOW] = val;
val = lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH);
if (val < 0)
return val;
data->temp8[LOCAL_HIGH] = val;
if (data->reg_local_ext) {
val = lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
data->reg_local_ext);
if (val < 0)
return val;
data->temp11[LOCAL_TEMP] = val;
} else {
val = lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP);
if (val < 0)
return val;
data->temp11[LOCAL_TEMP] = val << 8;
}
val = lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
LM90_REG_R_REMOTE_TEMPL);
if (val < 0)
return val;
data->temp11[REMOTE_TEMP] = val;
val = lm90_read_reg(client, LM90_REG_R_STATUS);
if (val < 0)
return val;
data->alarms = val; /* lower 8 bit of alarms */
if (data->kind == max6696) {
val = lm90_select_remote_channel(data, 1);
if (val < 0)
return val;
val = lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
LM90_REG_R_REMOTE_TEMPL);
if (val < 0) {
lm90_select_remote_channel(data, 0);
return val;
}
data->temp11[REMOTE2_TEMP] = val;
lm90_select_remote_channel(data, 0);
val = lm90_read_reg(client, MAX6696_REG_R_STATUS2);
if (val < 0)
return val;
data->alarms |= val << 8;
}
/*
* Re-enable ALERT# output if it was originally enabled and
* relevant alarms are all clear
*/
if (!(data->config_orig & 0x80) &&
!(data->alarms & data->alert_alarms)) {
if (data->config & 0x80) {
dev_dbg(&client->dev, "Re-enabling ALERT#\n");
lm90_update_confreg(data, data->config & ~0x80);
}
}
data->last_updated = jiffies;
data->valid = true;
}
return 0;
}
/*
* Conversions
* For local temperatures and limits, critical limits and the hysteresis
* value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
* For remote temperatures and limits, it uses signed 11-bit values with
* LSB = 0.125 degree Celsius, left-justified in 16-bit registers. Some
* Maxim chips use unsigned values.
*/
static inline int temp_from_s8(s8 val)
{
return val * 1000;
}
static inline int temp_from_u8(u8 val)
{
return val * 1000;
}
static inline int temp_from_s16(s16 val)
{
return val / 32 * 125;
}
static inline int temp_from_u16(u16 val)
{
return val / 32 * 125;
}
static s8 temp_to_s8(long val)
{
if (val <= -128000)
return -128;
if (val >= 127000)
return 127;
if (val < 0)
return (val - 500) / 1000;
return (val + 500) / 1000;
}
static u8 temp_to_u8(long val)
{
if (val <= 0)
return 0;
if (val >= 255000)
return 255;
return (val + 500) / 1000;
}
static s16 temp_to_s16(long val)
{
if (val <= -128000)
return 0x8000;
if (val >= 127875)
return 0x7FE0;
if (val < 0)
return (val - 62) / 125 * 32;
return (val + 62) / 125 * 32;
}
static u8 hyst_to_reg(long val)
{
if (val <= 0)
return 0;
if (val >= 30500)
return 31;
return (val + 500) / 1000;
}
/*
* ADT7461 in compatibility mode is almost identical to LM90 except that
* attempts to write values that are outside the range 0 < temp < 127 are
* treated as the boundary value.
*
* ADT7461 in "extended mode" operation uses unsigned integers offset by
* 64 (e.g., 0 -> -64 degC). The range is restricted to -64..191 degC.
*/
static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val)
{
if (data->flags & LM90_FLAG_ADT7461_EXT)
return (val - 64) * 1000;
return temp_from_s8(val);
}
static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val)
{
if (data->flags & LM90_FLAG_ADT7461_EXT)
return (val - 0x4000) / 64 * 250;
return temp_from_s16(val);
}
static u8 temp_to_u8_adt7461(struct lm90_data *data, long val)
{
if (data->flags & LM90_FLAG_ADT7461_EXT) {
if (val <= -64000)
return 0;
if (val >= 191000)
return 0xFF;
return (val + 500 + 64000) / 1000;
}
if (val <= 0)
return 0;
if (val >= 127000)
return 127;
return (val + 500) / 1000;
}
static u16 temp_to_u16_adt7461(struct lm90_data *data, long val)
{
if (data->flags & LM90_FLAG_ADT7461_EXT) {
if (val <= -64000)
return 0;
if (val >= 191750)
return 0xFFC0;
return (val + 64000 + 125) / 250 * 64;
}
if (val <= 0)
return 0;
if (val >= 127750)
return 0x7FC0;
return (val + 125) / 250 * 64;
}
/* pec used for ADM1032 only */
static ssize_t pec_show(struct device *dev, struct device_attribute *dummy,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
}
static ssize_t pec_store(struct device *dev, struct device_attribute *dummy,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err < 0)
return err;
switch (val) {
case 0:
client->flags &= ~I2C_CLIENT_PEC;
break;
case 1:
client->flags |= I2C_CLIENT_PEC;
break;
default:
return -EINVAL;
}
return count;
}
static DEVICE_ATTR_RW(pec);
static int lm90_get_temp11(struct lm90_data *data, int index)
{
s16 temp11 = data->temp11[index];
int temp;
if (data->kind == adt7461 || data->kind == tmp451)
temp = temp_from_u16_adt7461(data, temp11);
else if (data->kind == max6646)
temp = temp_from_u16(temp11);
else
temp = temp_from_s16(temp11);
/* +16 degrees offset for temp2 for the LM99 */
if (data->kind == lm99 && index <= 2)
temp += 16000;
return temp;
}
static int lm90_set_temp11(struct lm90_data *data, int index, long val)
{
static struct reg {
u8 high;
u8 low;