forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathmax1363.c
1701 lines (1558 loc) · 46.6 KB
/
max1363.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
/*
* iio/adc/max1363.c
* Copyright (C) 2008-2010 Jonathan Cameron
*
* based on linux/drivers/i2c/chips/max123x
* Copyright (C) 2002-2004 Stefan Eletzhofer
*
* based on linux/drivers/acron/char/pcf8583.c
* Copyright (C) 2000 Russell King
*
* Driver for max1363 and similar chips.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/i2c.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/iio/buffer.h>
#include <linux/iio/driver.h>
#include <linux/iio/kfifo_buf.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#define MAX1363_SETUP_BYTE(a) ((a) | 0x80)
/* There is a fair bit more defined here than currently
* used, but the intention is to support everything these
* chips do in the long run */
/* see data sheets */
/* max1363 and max1236, max1237, max1238, max1239 */
#define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_VDD 0x00
#define MAX1363_SETUP_AIN3_IS_REF_EXT_TO_REF 0x20
#define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_INT 0x40
#define MAX1363_SETUP_AIN3_IS_REF_REF_IS_INT 0x60
#define MAX1363_SETUP_POWER_UP_INT_REF 0x10
#define MAX1363_SETUP_POWER_DOWN_INT_REF 0x00
/* think about including max11600 etc - more settings */
#define MAX1363_SETUP_EXT_CLOCK 0x08
#define MAX1363_SETUP_INT_CLOCK 0x00
#define MAX1363_SETUP_UNIPOLAR 0x00
#define MAX1363_SETUP_BIPOLAR 0x04
#define MAX1363_SETUP_RESET 0x00
#define MAX1363_SETUP_NORESET 0x02
/* max1363 only - though don't care on others.
* For now monitor modes are not implemented as the relevant
* line is not connected on my test board.
* The definitions are here as I intend to add this soon.
*/
#define MAX1363_SETUP_MONITOR_SETUP 0x01
/* Specific to the max1363 */
#define MAX1363_MON_RESET_CHAN(a) (1 << ((a) + 4))
#define MAX1363_MON_INT_ENABLE 0x01
/* defined for readability reasons */
/* All chips */
#define MAX1363_CONFIG_BYTE(a) ((a))
#define MAX1363_CONFIG_SE 0x01
#define MAX1363_CONFIG_DE 0x00
#define MAX1363_CONFIG_SCAN_TO_CS 0x00
#define MAX1363_CONFIG_SCAN_SINGLE_8 0x20
#define MAX1363_CONFIG_SCAN_MONITOR_MODE 0x40
#define MAX1363_CONFIG_SCAN_SINGLE_1 0x60
/* max123{6-9} only */
#define MAX1236_SCAN_MID_TO_CHANNEL 0x40
/* max1363 only - merely part of channel selects or don't care for others */
#define MAX1363_CONFIG_EN_MON_MODE_READ 0x18
#define MAX1363_CHANNEL_SEL(a) ((a) << 1)
/* max1363 strictly 0x06 - but doesn't matter */
#define MAX1363_CHANNEL_SEL_MASK 0x1E
#define MAX1363_SCAN_MASK 0x60
#define MAX1363_SE_DE_MASK 0x01
#define MAX1363_MAX_CHANNELS 25
/**
* struct max1363_mode - scan mode information
* @conf: The corresponding value of the configuration register
* @modemask: Bit mask corresponding to channels enabled in this mode
*/
struct max1363_mode {
int8_t conf;
DECLARE_BITMAP(modemask, MAX1363_MAX_CHANNELS);
};
/* This must be maintained along side the max1363_mode_table in max1363_core */
enum max1363_modes {
/* Single read of a single channel */
_s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11,
/* Differential single read */
d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
/* Scan to channel and mid to channel where overlapping */
s0to1, s0to2, s2to3, s0to3, s0to4, s0to5, s0to6,
s6to7, s0to7, s6to8, s0to8, s6to9,
s0to9, s6to10, s0to10, s6to11, s0to11,
/* Differential scan to channel and mid to channel where overlapping */
d0m1to2m3, d0m1to4m5, d0m1to6m7, d6m7to8m9,
d0m1to8m9, d6m7to10m11, d0m1to10m11, d1m0to3m2,
d1m0to5m4, d1m0to7m6, d7m6to9m8, d1m0to9m8,
d7m6to11m10, d1m0to11m10,
};
/**
* struct max1363_chip_info - chip specifc information
* @info: iio core function callbacks structure
* @channels: channel specification
* @num_channels: number of channels
* @mode_list: array of available scan modes
* @default_mode: the scan mode in which the chip starts up
* @int_vref_mv: the internal reference voltage
* @num_modes: number of modes
* @bits: accuracy of the adc in bits
*/
struct max1363_chip_info {
const struct iio_info *info;
const struct iio_chan_spec *channels;
int num_channels;
const enum max1363_modes *mode_list;
enum max1363_modes default_mode;
u16 int_vref_mv;
u8 num_modes;
u8 bits;
};
/**
* struct max1363_state - driver instance specific data
* @client: i2c_client
* @setupbyte: cache of current device setup byte
* @configbyte: cache of current device config byte
* @chip_info: chip model specific constants, available modes, etc.
* @current_mode: the scan mode of this chip
* @requestedmask: a valid requested set of channels
* @reg: supply regulator
* @monitor_on: whether monitor mode is enabled
* @monitor_speed: parameter corresponding to device monitor speed setting
* @mask_high: bitmask for enabled high thresholds
* @mask_low: bitmask for enabled low thresholds
* @thresh_high: high threshold values
* @thresh_low: low threshold values
* @vref: Reference voltage regulator
* @vref_uv: Actual (external or internal) reference voltage
* @send: function used to send data to the chip
* @recv: function used to receive data from the chip
*/
struct max1363_state {
struct i2c_client *client;
u8 setupbyte;
u8 configbyte;
const struct max1363_chip_info *chip_info;
const struct max1363_mode *current_mode;
u32 requestedmask;
struct regulator *reg;
/* Using monitor modes and buffer at the same time is
currently not supported */
bool monitor_on;
unsigned int monitor_speed:3;
u8 mask_high;
u8 mask_low;
/* 4x unipolar first then the fours bipolar ones */
s16 thresh_high[8];
s16 thresh_low[8];
struct regulator *vref;
u32 vref_uv;
int (*send)(const struct i2c_client *client,
const char *buf, int count);
int (*recv)(const struct i2c_client *client,
char *buf, int count);
};
#define MAX1363_MODE_SINGLE(_num, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1363_CONFIG_SCAN_SINGLE_1 \
| MAX1363_CONFIG_SE, \
.modemask[0] = _mask, \
}
#define MAX1363_MODE_SCAN_TO_CHANNEL(_num, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1363_CONFIG_SCAN_TO_CS \
| MAX1363_CONFIG_SE, \
.modemask[0] = _mask, \
}
/* note not available for max1363 hence naming */
#define MAX1236_MODE_SCAN_MID_TO_CHANNEL(_mid, _num, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1236_SCAN_MID_TO_CHANNEL \
| MAX1363_CONFIG_SE, \
.modemask[0] = _mask \
}
#define MAX1363_MODE_DIFF_SINGLE(_nump, _numm, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_nump) \
| MAX1363_CONFIG_SCAN_SINGLE_1 \
| MAX1363_CONFIG_DE, \
.modemask[0] = _mask \
}
/* Can't think how to automate naming so specify for now */
#define MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(_num, _numvals, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1363_CONFIG_SCAN_TO_CS \
| MAX1363_CONFIG_DE, \
.modemask[0] = _mask \
}
/* note only available for max1363 hence naming */
#define MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(_num, _numvals, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1236_SCAN_MID_TO_CHANNEL \
| MAX1363_CONFIG_SE, \
.modemask[0] = _mask \
}
static const struct max1363_mode max1363_mode_table[] = {
/* All of the single channel options first */
MAX1363_MODE_SINGLE(0, 1 << 0),
MAX1363_MODE_SINGLE(1, 1 << 1),
MAX1363_MODE_SINGLE(2, 1 << 2),
MAX1363_MODE_SINGLE(3, 1 << 3),
MAX1363_MODE_SINGLE(4, 1 << 4),
MAX1363_MODE_SINGLE(5, 1 << 5),
MAX1363_MODE_SINGLE(6, 1 << 6),
MAX1363_MODE_SINGLE(7, 1 << 7),
MAX1363_MODE_SINGLE(8, 1 << 8),
MAX1363_MODE_SINGLE(9, 1 << 9),
MAX1363_MODE_SINGLE(10, 1 << 10),
MAX1363_MODE_SINGLE(11, 1 << 11),
MAX1363_MODE_DIFF_SINGLE(0, 1, 1 << 12),
MAX1363_MODE_DIFF_SINGLE(2, 3, 1 << 13),
MAX1363_MODE_DIFF_SINGLE(4, 5, 1 << 14),
MAX1363_MODE_DIFF_SINGLE(6, 7, 1 << 15),
MAX1363_MODE_DIFF_SINGLE(8, 9, 1 << 16),
MAX1363_MODE_DIFF_SINGLE(10, 11, 1 << 17),
MAX1363_MODE_DIFF_SINGLE(1, 0, 1 << 18),
MAX1363_MODE_DIFF_SINGLE(3, 2, 1 << 19),
MAX1363_MODE_DIFF_SINGLE(5, 4, 1 << 20),
MAX1363_MODE_DIFF_SINGLE(7, 6, 1 << 21),
MAX1363_MODE_DIFF_SINGLE(9, 8, 1 << 22),
MAX1363_MODE_DIFF_SINGLE(11, 10, 1 << 23),
/* The multichannel scans next */
MAX1363_MODE_SCAN_TO_CHANNEL(1, 0x003),
MAX1363_MODE_SCAN_TO_CHANNEL(2, 0x007),
MAX1236_MODE_SCAN_MID_TO_CHANNEL(2, 3, 0x00C),
MAX1363_MODE_SCAN_TO_CHANNEL(3, 0x00F),
MAX1363_MODE_SCAN_TO_CHANNEL(4, 0x01F),
MAX1363_MODE_SCAN_TO_CHANNEL(5, 0x03F),
MAX1363_MODE_SCAN_TO_CHANNEL(6, 0x07F),
MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 7, 0x0C0),
MAX1363_MODE_SCAN_TO_CHANNEL(7, 0x0FF),
MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 8, 0x1C0),
MAX1363_MODE_SCAN_TO_CHANNEL(8, 0x1FF),
MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 9, 0x3C0),
MAX1363_MODE_SCAN_TO_CHANNEL(9, 0x3FF),
MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 10, 0x7C0),
MAX1363_MODE_SCAN_TO_CHANNEL(10, 0x7FF),
MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 11, 0xFC0),
MAX1363_MODE_SCAN_TO_CHANNEL(11, 0xFFF),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(2, 2, 0x003000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(4, 3, 0x007000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(6, 4, 0x00F000),
MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(8, 2, 0x018000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(8, 5, 0x01F000),
MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(10, 3, 0x038000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(10, 6, 0x3F000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(3, 2, 0x0C0000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(5, 3, 0x1C0000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(7, 4, 0x3C0000),
MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(9, 2, 0x600000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(9, 5, 0x7C0000),
MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(11, 3, 0xE00000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(11, 6, 0xFC0000),
};
static const struct max1363_mode
*max1363_match_mode(const unsigned long *mask,
const struct max1363_chip_info *ci)
{
int i;
if (mask)
for (i = 0; i < ci->num_modes; i++)
if (bitmap_subset(mask,
max1363_mode_table[ci->mode_list[i]].
modemask,
MAX1363_MAX_CHANNELS))
return &max1363_mode_table[ci->mode_list[i]];
return NULL;
}
static int max1363_smbus_send(const struct i2c_client *client, const char *buf,
int count)
{
int i, err;
for (i = err = 0; err == 0 && i < count; ++i)
err = i2c_smbus_write_byte(client, buf[i]);
return err ? err : count;
}
static int max1363_smbus_recv(const struct i2c_client *client, char *buf,
int count)
{
int i, ret;
for (i = 0; i < count; ++i) {
ret = i2c_smbus_read_byte(client);
if (ret < 0)
return ret;
buf[i] = ret;
}
return count;
}
static int max1363_write_basic_config(struct max1363_state *st)
{
u8 tx_buf[2] = { st->setupbyte, st->configbyte };
return st->send(st->client, tx_buf, 2);
}
static int max1363_set_scan_mode(struct max1363_state *st)
{
st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK
| MAX1363_SCAN_MASK
| MAX1363_SE_DE_MASK);
st->configbyte |= st->current_mode->conf;
return max1363_write_basic_config(st);
}
static int max1363_read_single_chan(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
long m)
{
int ret = 0;
s32 data;
u8 rxbuf[2];
struct max1363_state *st = iio_priv(indio_dev);
struct i2c_client *client = st->client;
mutex_lock(&indio_dev->mlock);
/*
* If monitor mode is enabled, the method for reading a single
* channel will have to be rather different and has not yet
* been implemented.
*
* Also, cannot read directly if buffered capture enabled.
*/
if (st->monitor_on || iio_buffer_enabled(indio_dev)) {
ret = -EBUSY;
goto error_ret;
}
/* Check to see if current scan mode is correct */
if (st->current_mode != &max1363_mode_table[chan->address]) {
/* Update scan mode if needed */
st->current_mode = &max1363_mode_table[chan->address];
ret = max1363_set_scan_mode(st);
if (ret < 0)
goto error_ret;
}
if (st->chip_info->bits != 8) {
/* Get reading */
data = st->recv(client, rxbuf, 2);
if (data < 0) {
ret = data;
goto error_ret;
}
data = (rxbuf[1] | rxbuf[0] << 8) &
((1 << st->chip_info->bits) - 1);
} else {
/* Get reading */
data = st->recv(client, rxbuf, 1);
if (data < 0) {
ret = data;
goto error_ret;
}
data = rxbuf[0];
}
*val = data;
error_ret:
mutex_unlock(&indio_dev->mlock);
return ret;
}
static int max1363_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long m)
{
struct max1363_state *st = iio_priv(indio_dev);
int ret;
switch (m) {
case IIO_CHAN_INFO_RAW:
ret = max1363_read_single_chan(indio_dev, chan, val, m);
if (ret < 0)
return ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = st->vref_uv / 1000;
*val2 = st->chip_info->bits;
return IIO_VAL_FRACTIONAL_LOG2;
default:
return -EINVAL;
}
return 0;
}
/* Applies to max1363 */
static const enum max1363_modes max1363_mode_list[] = {
_s0, _s1, _s2, _s3,
s0to1, s0to2, s0to3,
d0m1, d2m3, d1m0, d3m2,
d0m1to2m3, d1m0to3m2,
};
static const struct iio_event_spec max1363_events[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_RISING,
.mask_separate = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_ENABLE),
}, {
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_FALLING,
.mask_separate = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_ENABLE),
},
};
#define MAX1363_CHAN_U(num, addr, si, bits, ev_spec, num_ev_spec) \
{ \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.channel = num, \
.address = addr, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.datasheet_name = "AIN"#num, \
.scan_type = { \
.sign = 'u', \
.realbits = bits, \
.storagebits = (bits > 8) ? 16 : 8, \
.endianness = IIO_BE, \
}, \
.scan_index = si, \
.event_spec = ev_spec, \
.num_event_specs = num_ev_spec, \
}
/* bipolar channel */
#define MAX1363_CHAN_B(num, num2, addr, si, bits, ev_spec, num_ev_spec) \
{ \
.type = IIO_VOLTAGE, \
.differential = 1, \
.indexed = 1, \
.channel = num, \
.channel2 = num2, \
.address = addr, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.datasheet_name = "AIN"#num"-AIN"#num2, \
.scan_type = { \
.sign = 's', \
.realbits = bits, \
.storagebits = (bits > 8) ? 16 : 8, \
.endianness = IIO_BE, \
}, \
.scan_index = si, \
.event_spec = ev_spec, \
.num_event_specs = num_ev_spec, \
}
#define MAX1363_4X_CHANS(bits, ev_spec, num_ev_spec) { \
MAX1363_CHAN_U(0, _s0, 0, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_U(1, _s1, 1, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_U(2, _s2, 2, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_U(3, _s3, 3, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_B(0, 1, d0m1, 4, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_B(2, 3, d2m3, 5, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_B(1, 0, d1m0, 6, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_B(3, 2, d3m2, 7, bits, ev_spec, num_ev_spec), \
IIO_CHAN_SOFT_TIMESTAMP(8) \
}
static const struct iio_chan_spec max1036_channels[] =
MAX1363_4X_CHANS(8, NULL, 0);
static const struct iio_chan_spec max1136_channels[] =
MAX1363_4X_CHANS(10, NULL, 0);
static const struct iio_chan_spec max1236_channels[] =
MAX1363_4X_CHANS(12, NULL, 0);
static const struct iio_chan_spec max1361_channels[] =
MAX1363_4X_CHANS(10, max1363_events, ARRAY_SIZE(max1363_events));
static const struct iio_chan_spec max1363_channels[] =
MAX1363_4X_CHANS(12, max1363_events, ARRAY_SIZE(max1363_events));
/* Applies to max1236, max1237 */
static const enum max1363_modes max1236_mode_list[] = {
_s0, _s1, _s2, _s3,
s0to1, s0to2, s0to3,
d0m1, d2m3, d1m0, d3m2,
d0m1to2m3, d1m0to3m2,
s2to3,
};
/* Applies to max1238, max1239 */
static const enum max1363_modes max1238_mode_list[] = {
_s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11,
s0to1, s0to2, s0to3, s0to4, s0to5, s0to6,
s0to7, s0to8, s0to9, s0to10, s0to11,
d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
d0m1to2m3, d0m1to4m5, d0m1to6m7, d0m1to8m9, d0m1to10m11,
d1m0to3m2, d1m0to5m4, d1m0to7m6, d1m0to9m8, d1m0to11m10,
s6to7, s6to8, s6to9, s6to10, s6to11,
d6m7to8m9, d6m7to10m11, d7m6to9m8, d7m6to11m10,
};
#define MAX1363_12X_CHANS(bits) { \
MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0), \
MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0), \
MAX1363_CHAN_U(2, _s2, 2, bits, NULL, 0), \
MAX1363_CHAN_U(3, _s3, 3, bits, NULL, 0), \
MAX1363_CHAN_U(4, _s4, 4, bits, NULL, 0), \
MAX1363_CHAN_U(5, _s5, 5, bits, NULL, 0), \
MAX1363_CHAN_U(6, _s6, 6, bits, NULL, 0), \
MAX1363_CHAN_U(7, _s7, 7, bits, NULL, 0), \
MAX1363_CHAN_U(8, _s8, 8, bits, NULL, 0), \
MAX1363_CHAN_U(9, _s9, 9, bits, NULL, 0), \
MAX1363_CHAN_U(10, _s10, 10, bits, NULL, 0), \
MAX1363_CHAN_U(11, _s11, 11, bits, NULL, 0), \
MAX1363_CHAN_B(0, 1, d0m1, 12, bits, NULL, 0), \
MAX1363_CHAN_B(2, 3, d2m3, 13, bits, NULL, 0), \
MAX1363_CHAN_B(4, 5, d4m5, 14, bits, NULL, 0), \
MAX1363_CHAN_B(6, 7, d6m7, 15, bits, NULL, 0), \
MAX1363_CHAN_B(8, 9, d8m9, 16, bits, NULL, 0), \
MAX1363_CHAN_B(10, 11, d10m11, 17, bits, NULL, 0), \
MAX1363_CHAN_B(1, 0, d1m0, 18, bits, NULL, 0), \
MAX1363_CHAN_B(3, 2, d3m2, 19, bits, NULL, 0), \
MAX1363_CHAN_B(5, 4, d5m4, 20, bits, NULL, 0), \
MAX1363_CHAN_B(7, 6, d7m6, 21, bits, NULL, 0), \
MAX1363_CHAN_B(9, 8, d9m8, 22, bits, NULL, 0), \
MAX1363_CHAN_B(11, 10, d11m10, 23, bits, NULL, 0), \
IIO_CHAN_SOFT_TIMESTAMP(24) \
}
static const struct iio_chan_spec max1038_channels[] = MAX1363_12X_CHANS(8);
static const struct iio_chan_spec max1138_channels[] = MAX1363_12X_CHANS(10);
static const struct iio_chan_spec max1238_channels[] = MAX1363_12X_CHANS(12);
static const enum max1363_modes max11607_mode_list[] = {
_s0, _s1, _s2, _s3,
s0to1, s0to2, s0to3,
s2to3,
d0m1, d2m3, d1m0, d3m2,
d0m1to2m3, d1m0to3m2,
};
static const enum max1363_modes max11608_mode_list[] = {
_s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7,
s0to1, s0to2, s0to3, s0to4, s0to5, s0to6, s0to7,
s6to7,
d0m1, d2m3, d4m5, d6m7,
d1m0, d3m2, d5m4, d7m6,
d0m1to2m3, d0m1to4m5, d0m1to6m7,
d1m0to3m2, d1m0to5m4, d1m0to7m6,
};
#define MAX1363_8X_CHANS(bits) { \
MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0), \
MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0), \
MAX1363_CHAN_U(2, _s2, 2, bits, NULL, 0), \
MAX1363_CHAN_U(3, _s3, 3, bits, NULL, 0), \
MAX1363_CHAN_U(4, _s4, 4, bits, NULL, 0), \
MAX1363_CHAN_U(5, _s5, 5, bits, NULL, 0), \
MAX1363_CHAN_U(6, _s6, 6, bits, NULL, 0), \
MAX1363_CHAN_U(7, _s7, 7, bits, NULL, 0), \
MAX1363_CHAN_B(0, 1, d0m1, 8, bits, NULL, 0), \
MAX1363_CHAN_B(2, 3, d2m3, 9, bits, NULL, 0), \
MAX1363_CHAN_B(4, 5, d4m5, 10, bits, NULL, 0), \
MAX1363_CHAN_B(6, 7, d6m7, 11, bits, NULL, 0), \
MAX1363_CHAN_B(1, 0, d1m0, 12, bits, NULL, 0), \
MAX1363_CHAN_B(3, 2, d3m2, 13, bits, NULL, 0), \
MAX1363_CHAN_B(5, 4, d5m4, 14, bits, NULL, 0), \
MAX1363_CHAN_B(7, 6, d7m6, 15, bits, NULL, 0), \
IIO_CHAN_SOFT_TIMESTAMP(16) \
}
static const struct iio_chan_spec max11602_channels[] = MAX1363_8X_CHANS(8);
static const struct iio_chan_spec max11608_channels[] = MAX1363_8X_CHANS(10);
static const struct iio_chan_spec max11614_channels[] = MAX1363_8X_CHANS(12);
static const enum max1363_modes max11644_mode_list[] = {
_s0, _s1, s0to1, d0m1, d1m0,
};
#define MAX1363_2X_CHANS(bits) { \
MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0), \
MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0), \
MAX1363_CHAN_B(0, 1, d0m1, 2, bits, NULL, 0), \
MAX1363_CHAN_B(1, 0, d1m0, 3, bits, NULL, 0), \
IIO_CHAN_SOFT_TIMESTAMP(4) \
}
static const struct iio_chan_spec max11646_channels[] = MAX1363_2X_CHANS(10);
static const struct iio_chan_spec max11644_channels[] = MAX1363_2X_CHANS(12);
enum { max1361,
max1362,
max1363,
max1364,
max1036,
max1037,
max1038,
max1039,
max1136,
max1137,
max1138,
max1139,
max1236,
max1237,
max1238,
max1239,
max11600,
max11601,
max11602,
max11603,
max11604,
max11605,
max11606,
max11607,
max11608,
max11609,
max11610,
max11611,
max11612,
max11613,
max11614,
max11615,
max11616,
max11617,
max11644,
max11645,
max11646,
max11647
};
static const int max1363_monitor_speeds[] = { 133000, 665000, 33300, 16600,
8300, 4200, 2000, 1000 };
static ssize_t max1363_monitor_show_freq(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct max1363_state *st = iio_priv(dev_to_iio_dev(dev));
return sprintf(buf, "%d\n", max1363_monitor_speeds[st->monitor_speed]);
}
static ssize_t max1363_monitor_store_freq(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct max1363_state *st = iio_priv(indio_dev);
int i, ret;
unsigned long val;
bool found = false;
ret = kstrtoul(buf, 10, &val);
if (ret)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(max1363_monitor_speeds); i++)
if (val == max1363_monitor_speeds[i]) {
found = true;
break;
}
if (!found)
return -EINVAL;
mutex_lock(&indio_dev->mlock);
st->monitor_speed = i;
mutex_unlock(&indio_dev->mlock);
return 0;
}
static IIO_DEV_ATTR_SAMP_FREQ(S_IRUGO | S_IWUSR,
max1363_monitor_show_freq,
max1363_monitor_store_freq);
static IIO_CONST_ATTR(sampling_frequency_available,
"133000 665000 33300 16600 8300 4200 2000 1000");
static int max1363_read_thresh(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, enum iio_event_type type,
enum iio_event_direction dir, enum iio_event_info info, int *val,
int *val2)
{
struct max1363_state *st = iio_priv(indio_dev);
if (dir == IIO_EV_DIR_FALLING)
*val = st->thresh_low[chan->channel];
else
*val = st->thresh_high[chan->channel];
return IIO_VAL_INT;
}
static int max1363_write_thresh(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, enum iio_event_type type,
enum iio_event_direction dir, enum iio_event_info info, int val,
int val2)
{
struct max1363_state *st = iio_priv(indio_dev);
/* make it handle signed correctly as well */
switch (st->chip_info->bits) {
case 10:
if (val > 0x3FF)
return -EINVAL;
break;
case 12:
if (val > 0xFFF)
return -EINVAL;
break;
}
switch (dir) {
case IIO_EV_DIR_FALLING:
st->thresh_low[chan->channel] = val;
break;
case IIO_EV_DIR_RISING:
st->thresh_high[chan->channel] = val;
break;
default:
return -EINVAL;
}
return 0;
}
static const u64 max1363_event_codes[] = {
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 1,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 2,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 3,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 1,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 2,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 3,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
};
static irqreturn_t max1363_event_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct max1363_state *st = iio_priv(indio_dev);
s64 timestamp = iio_get_time_ns();
unsigned long mask, loc;
u8 rx;
u8 tx[2] = { st->setupbyte,
MAX1363_MON_INT_ENABLE | (st->monitor_speed << 1) | 0xF0 };
st->recv(st->client, &rx, 1);
mask = rx;
for_each_set_bit(loc, &mask, 8)
iio_push_event(indio_dev, max1363_event_codes[loc], timestamp);
st->send(st->client, tx, 2);
return IRQ_HANDLED;
}
static int max1363_read_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, enum iio_event_type type,
enum iio_event_direction dir)
{
struct max1363_state *st = iio_priv(indio_dev);
int val;
int number = chan->channel;
mutex_lock(&indio_dev->mlock);
if (dir == IIO_EV_DIR_FALLING)
val = (1 << number) & st->mask_low;
else
val = (1 << number) & st->mask_high;
mutex_unlock(&indio_dev->mlock);
return val;
}
static int max1363_monitor_mode_update(struct max1363_state *st, int enabled)
{
u8 *tx_buf;
int ret, i = 3, j;
unsigned long numelements;
int len;
const long *modemask;
if (!enabled) {
/* transition to buffered capture is not currently supported */
st->setupbyte &= ~MAX1363_SETUP_MONITOR_SETUP;
st->configbyte &= ~MAX1363_SCAN_MASK;
st->monitor_on = false;
return max1363_write_basic_config(st);
}
/* Ensure we are in the relevant mode */
st->setupbyte |= MAX1363_SETUP_MONITOR_SETUP;
st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK
| MAX1363_SCAN_MASK
| MAX1363_SE_DE_MASK);
st->configbyte |= MAX1363_CONFIG_SCAN_MONITOR_MODE;
if ((st->mask_low | st->mask_high) & 0x0F) {
st->configbyte |= max1363_mode_table[s0to3].conf;
modemask = max1363_mode_table[s0to3].modemask;
} else if ((st->mask_low | st->mask_high) & 0x30) {
st->configbyte |= max1363_mode_table[d0m1to2m3].conf;
modemask = max1363_mode_table[d0m1to2m3].modemask;
} else {
st->configbyte |= max1363_mode_table[d1m0to3m2].conf;
modemask = max1363_mode_table[d1m0to3m2].modemask;
}
numelements = bitmap_weight(modemask, MAX1363_MAX_CHANNELS);
len = 3 * numelements + 3;
tx_buf = kmalloc(len, GFP_KERNEL);
if (!tx_buf) {
ret = -ENOMEM;
goto error_ret;
}
tx_buf[0] = st->configbyte;
tx_buf[1] = st->setupbyte;
tx_buf[2] = (st->monitor_speed << 1);
/*
* So we need to do yet another bit of nefarious scan mode
* setup to match what we need.
*/
for (j = 0; j < 8; j++)
if (test_bit(j, modemask)) {
/* Establish the mode is in the scan */
if (st->mask_low & (1 << j)) {
tx_buf[i] = (st->thresh_low[j] >> 4) & 0xFF;
tx_buf[i + 1] = (st->thresh_low[j] << 4) & 0xF0;
} else if (j < 4) {
tx_buf[i] = 0;
tx_buf[i + 1] = 0;
} else {
tx_buf[i] = 0x80;
tx_buf[i + 1] = 0;
}
if (st->mask_high & (1 << j)) {
tx_buf[i + 1] |=
(st->thresh_high[j] >> 8) & 0x0F;
tx_buf[i + 2] = st->thresh_high[j] & 0xFF;
} else if (j < 4) {
tx_buf[i + 1] |= 0x0F;
tx_buf[i + 2] = 0xFF;
} else {
tx_buf[i + 1] |= 0x07;
tx_buf[i + 2] = 0xFF;
}
i += 3;
}
ret = st->send(st->client, tx_buf, len);
if (ret < 0)
goto error_ret;
if (ret != len) {
ret = -EIO;
goto error_ret;
}
/*
* Now that we hopefully have sensible thresholds in place it is
* time to turn the interrupts on.
* It is unclear from the data sheet if this should be necessary
* (i.e. whether monitor mode setup is atomic) but it appears to
* be in practice.
*/
tx_buf[0] = st->setupbyte;
tx_buf[1] = MAX1363_MON_INT_ENABLE | (st->monitor_speed << 1) | 0xF0;
ret = st->send(st->client, tx_buf, 2);
if (ret < 0)
goto error_ret;
if (ret != 2) {
ret = -EIO;
goto error_ret;
}
ret = 0;
st->monitor_on = true;
error_ret:
kfree(tx_buf);
return ret;
}
/*
* To keep this manageable we always use one of 3 scan modes.
* Scan 0...3, 0-1,2-3 and 1-0,3-2
*/
static inline int __max1363_check_event_mask(int thismask, int checkmask)
{
int ret = 0;
/* Is it unipolar */
if (thismask < 4) {
if (checkmask & ~0x0F) {
ret = -EBUSY;
goto error_ret;
}
} else if (thismask < 6) {
if (checkmask & ~0x30) {
ret = -EBUSY;
goto error_ret;
}
} else if (checkmask & ~0xC0)
ret = -EBUSY;
error_ret:
return ret;
}
static int max1363_write_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, enum iio_event_type type,
enum iio_event_direction dir, int state)
{
int ret = 0;
struct max1363_state *st = iio_priv(indio_dev);
u16 unifiedmask;
int number = chan->channel;
mutex_lock(&indio_dev->mlock);
unifiedmask = st->mask_low | st->mask_high;
if (dir == IIO_EV_DIR_FALLING) {
if (state == 0)
st->mask_low &= ~(1 << number);
else {
ret = __max1363_check_event_mask((1 << number),
unifiedmask);
if (ret)
goto error_ret;
st->mask_low |= (1 << number);
}
} else {
if (state == 0)
st->mask_high &= ~(1 << number);
else {
ret = __max1363_check_event_mask((1 << number),
unifiedmask);
if (ret)
goto error_ret;
st->mask_high |= (1 << number);
}
}
max1363_monitor_mode_update(st, !!(st->mask_high | st->mask_low));
error_ret:
mutex_unlock(&indio_dev->mlock);
return ret;
}
/*
* As with scan_elements, only certain sets of these can
* be combined.