summaryrefslogtreecommitdiffstats
path: root/drivers/iio/temperature/mlx90632.c
blob: 503fe54a0bb937ad9684b001cf3dd59dbf2741b1 (plain)
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
// SPDX-License-Identifier: GPL-2.0
/*
 * mlx90632.c - Melexis MLX90632 contactless IR temperature sensor
 *
 * Copyright (c) 2017 Melexis <cmo@melexis.com>
 *
 * Driver for the Melexis MLX90632 I2C 16-bit IR thermopile sensor
 */
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/limits.h>
#include <linux/module.h>
#include <linux/math64.h>
#include <linux/of.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

/* Memory sections addresses */
#define MLX90632_ADDR_RAM	0x4000 /* Start address of ram */
#define MLX90632_ADDR_EEPROM	0x2480 /* Start address of user eeprom */

/* EEPROM addresses - used at startup */
#define MLX90632_EE_CTRL	0x24d4 /* Control register initial value */
#define MLX90632_EE_I2C_ADDR	0x24d5 /* I2C address register initial value */
#define MLX90632_EE_VERSION	0x240b /* EEPROM version reg address */
#define MLX90632_EE_P_R		0x240c /* P_R calibration register 32bit */
#define MLX90632_EE_P_G		0x240e /* P_G calibration register 32bit */
#define MLX90632_EE_P_T		0x2410 /* P_T calibration register 32bit */
#define MLX90632_EE_P_O		0x2412 /* P_O calibration register 32bit */
#define MLX90632_EE_Aa		0x2414 /* Aa calibration register 32bit */
#define MLX90632_EE_Ab		0x2416 /* Ab calibration register 32bit */
#define MLX90632_EE_Ba		0x2418 /* Ba calibration register 32bit */
#define MLX90632_EE_Bb		0x241a /* Bb calibration register 32bit */
#define MLX90632_EE_Ca		0x241c /* Ca calibration register 32bit */
#define MLX90632_EE_Cb		0x241e /* Cb calibration register 32bit */
#define MLX90632_EE_Da		0x2420 /* Da calibration register 32bit */
#define MLX90632_EE_Db		0x2422 /* Db calibration register 32bit */
#define MLX90632_EE_Ea		0x2424 /* Ea calibration register 32bit */
#define MLX90632_EE_Eb		0x2426 /* Eb calibration register 32bit */
#define MLX90632_EE_Fa		0x2428 /* Fa calibration register 32bit */
#define MLX90632_EE_Fb		0x242a /* Fb calibration register 32bit */
#define MLX90632_EE_Ga		0x242c /* Ga calibration register 32bit */

#define MLX90632_EE_Gb		0x242e /* Gb calibration register 16bit */
#define MLX90632_EE_Ka		0x242f /* Ka calibration register 16bit */

#define MLX90632_EE_Ha		0x2481 /* Ha customer calib value reg 16bit */
#define MLX90632_EE_Hb		0x2482 /* Hb customer calib value reg 16bit */

/* Register addresses - volatile */
#define MLX90632_REG_I2C_ADDR	0x3000 /* Chip I2C address register */

/* Control register address - volatile */
#define MLX90632_REG_CONTROL	0x3001 /* Control Register address */
#define   MLX90632_CFG_PWR_MASK		GENMASK(2, 1) /* PowerMode Mask */
#define   MLX90632_CFG_MTYP_MASK		GENMASK(8, 4) /* Meas select Mask */

/* PowerModes statuses */
#define MLX90632_PWR_STATUS(ctrl_val) (ctrl_val << 1)
#define MLX90632_PWR_STATUS_HALT MLX90632_PWR_STATUS(0) /* hold */
#define MLX90632_PWR_STATUS_SLEEP_STEP MLX90632_PWR_STATUS(1) /* sleep step*/
#define MLX90632_PWR_STATUS_STEP MLX90632_PWR_STATUS(2) /* step */
#define MLX90632_PWR_STATUS_CONTINUOUS MLX90632_PWR_STATUS(3) /* continuous*/

/* Measurement types */
#define MLX90632_MTYP_MEDICAL 0
#define MLX90632_MTYP_EXTENDED 17

/* Measurement type select*/
#define MLX90632_MTYP_STATUS(ctrl_val) (ctrl_val << 4)
#define MLX90632_MTYP_STATUS_MEDICAL MLX90632_MTYP_STATUS(MLX90632_MTYP_MEDICAL)
#define MLX90632_MTYP_STATUS_EXTENDED MLX90632_MTYP_STATUS(MLX90632_MTYP_EXTENDED)

/* I2C command register - volatile */
#define MLX90632_REG_I2C_CMD    0x3005 /* I2C command Register address */

/* Device status register - volatile */
#define MLX90632_REG_STATUS	0x3fff /* Device status register */
#define   MLX90632_STAT_BUSY		BIT(10) /* Device busy indicator */
#define   MLX90632_STAT_EE_BUSY		BIT(9) /* EEPROM busy indicator */
#define   MLX90632_STAT_BRST		BIT(8) /* Brown out reset indicator */
#define   MLX90632_STAT_CYCLE_POS	GENMASK(6, 2) /* Data position */
#define   MLX90632_STAT_DATA_RDY	BIT(0) /* Data ready indicator */

/* RAM_MEAS address-es for each channel */
#define MLX90632_RAM_1(meas_num)	(MLX90632_ADDR_RAM + 3 * meas_num)
#define MLX90632_RAM_2(meas_num)	(MLX90632_ADDR_RAM + 3 * meas_num + 1)
#define MLX90632_RAM_3(meas_num)	(MLX90632_ADDR_RAM + 3 * meas_num + 2)

/* Name important RAM_MEAS channels */
#define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1 MLX90632_RAM_3(17)
#define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2 MLX90632_RAM_3(18)
#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_1 MLX90632_RAM_1(17)
#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_2 MLX90632_RAM_2(17)
#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_3 MLX90632_RAM_1(18)
#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_4 MLX90632_RAM_2(18)
#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_5 MLX90632_RAM_1(19)
#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_6 MLX90632_RAM_2(19)

/* Magic constants */
#define MLX90632_ID_MEDICAL	0x0105 /* EEPROM DSPv5 Medical device id */
#define MLX90632_ID_CONSUMER	0x0205 /* EEPROM DSPv5 Consumer device id */
#define MLX90632_ID_EXTENDED	0x0505 /* EEPROM DSPv5 Extended range device id */
#define MLX90632_ID_MASK	GENMASK(14, 0) /* DSP version and device ID in EE_VERSION */
#define MLX90632_DSP_VERSION	5 /* DSP version */
#define MLX90632_DSP_MASK	GENMASK(7, 0) /* DSP version in EE_VERSION */
#define MLX90632_RESET_CMD	0x0006 /* Reset sensor (address or global) */
#define MLX90632_REF_12 	12LL /* ResCtrlRef value of Ch 1 or Ch 2 */
#define MLX90632_REF_3		12LL /* ResCtrlRef value of Channel 3 */
#define MLX90632_MAX_MEAS_NUM	31 /* Maximum measurements in list */
#define MLX90632_SLEEP_DELAY_MS 3000 /* Autosleep delay */
#define MLX90632_EXTENDED_LIMIT 27000 /* Extended mode raw value limit */

/**
 * struct mlx90632_data - private data for the MLX90632 device
 * @client: I2C client of the device
 * @lock: Internal mutex for multiple reads for single measurement
 * @regmap: Regmap of the device
 * @emissivity: Object emissivity from 0 to 1000 where 1000 = 1.
 * @mtyp: Measurement type physical sensor configuration for extended range
 *        calculations
 * @object_ambient_temperature: Ambient temperature at object (might differ of
 *                              the ambient temperature of sensor.
 */
struct mlx90632_data {
	struct i2c_client *client;
	struct mutex lock;
	struct regmap *regmap;
	u16 emissivity;
	u8 mtyp;
	u32 object_ambient_temperature;
};

static const struct regmap_range mlx90632_volatile_reg_range[] = {
	regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
	regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD),
	regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS),
	regmap_reg_range(MLX90632_RAM_1(0),
			 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
};

static const struct regmap_access_table mlx90632_volatile_regs_tbl = {
	.yes_ranges = mlx90632_volatile_reg_range,
	.n_yes_ranges = ARRAY_SIZE(mlx90632_volatile_reg_range),
};

static const struct regmap_range mlx90632_read_reg_range[] = {
	regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka),
	regmap_reg_range(MLX90632_EE_CTRL, MLX90632_EE_I2C_ADDR),
	regmap_reg_range(MLX90632_EE_Ha, MLX90632_EE_Hb),
	regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
	regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD),
	regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS),
	regmap_reg_range(MLX90632_RAM_1(0),
			 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
};

static const struct regmap_access_table mlx90632_readable_regs_tbl = {
	.yes_ranges = mlx90632_read_reg_range,
	.n_yes_ranges = ARRAY_SIZE(mlx90632_read_reg_range),
};

static const struct regmap_range mlx90632_no_write_reg_range[] = {
	regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka),
	regmap_reg_range(MLX90632_RAM_1(0),
			 MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
};

static const struct regmap_access_table mlx90632_writeable_regs_tbl = {
	.no_ranges = mlx90632_no_write_reg_range,
	.n_no_ranges = ARRAY_SIZE(mlx90632_no_write_reg_range),
};

static const struct regmap_config mlx90632_regmap = {
	.reg_bits = 16,
	.val_bits = 16,

	.volatile_table = &mlx90632_volatile_regs_tbl,
	.rd_table = &mlx90632_readable_regs_tbl,
	.wr_table = &mlx90632_writeable_regs_tbl,

	.use_single_read = true,
	.use_single_write = true,
	.reg_format_endian = REGMAP_ENDIAN_BIG,
	.val_format_endian = REGMAP_ENDIAN_BIG,
	.cache_type = REGCACHE_RBTREE,
};

static s32 mlx90632_pwr_set_sleep_step(struct regmap *regmap)
{
	return regmap_update_bits(regmap, MLX90632_REG_CONTROL,
				  MLX90632_CFG_PWR_MASK,
				  MLX90632_PWR_STATUS_SLEEP_STEP);
}

static s32 mlx90632_pwr_continuous(struct regmap *regmap)
{
	return regmap_update_bits(regmap, MLX90632_REG_CONTROL,
				  MLX90632_CFG_PWR_MASK,
				  MLX90632_PWR_STATUS_CONTINUOUS);
}

/**
 * mlx90632_perform_measurement() - Trigger and retrieve current measurement cycle
 * @data: pointer to mlx90632_data object containing regmap information
 *
 * Perform a measurement and return latest measurement cycle position reported
 * by sensor. This is a blocking function for 500ms, as that is default sensor
 * refresh rate.
 */
static int mlx90632_perform_measurement(struct mlx90632_data *data)
{
	unsigned int reg_status;
	int ret;

	ret = regmap_update_bits(data->regmap, MLX90632_REG_STATUS,
				 MLX90632_STAT_DATA_RDY, 0);
	if (ret < 0)
		return ret;

	ret = regmap_read_poll_timeout(data->regmap, MLX90632_REG_STATUS, reg_status,
				       !(reg_status & MLX90632_STAT_DATA_RDY), 10000,
				       100 * 10000);

	if (ret < 0) {
		dev_err(&data->client->dev, "data not ready");
		return -ETIMEDOUT;
	}

	return (reg_status & MLX90632_STAT_CYCLE_POS) >> 2;
}

static int mlx90632_set_meas_type(struct regmap *regmap, u8 type)
{
	int ret;

	if ((type != MLX90632_MTYP_MEDICAL) && (type != MLX90632_MTYP_EXTENDED))
		return -EINVAL;

	ret = regmap_write(regmap, MLX90632_REG_I2C_CMD, MLX90632_RESET_CMD);
	if (ret < 0)
		return ret;

	ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL,
				 (MLX90632_CFG_MTYP_MASK | MLX90632_CFG_PWR_MASK),
				 (MLX90632_MTYP_STATUS(type) | MLX90632_PWR_STATUS_HALT));
	if (ret < 0)
		return ret;

	return mlx90632_pwr_continuous(regmap);
}

static int mlx90632_channel_new_select(int perform_ret, uint8_t *channel_new,
				       uint8_t *channel_old)
{
	switch (perform_ret) {
	case 1:
		*channel_new = 1;
		*channel_old = 2;
		break;
	case 2:
		*channel_new = 2;
		*channel_old = 1;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int mlx90632_read_ambient_raw(struct regmap *regmap,
				     s16 *ambient_new_raw, s16 *ambient_old_raw)
{
	int ret;
	unsigned int read_tmp;

	ret = regmap_read(regmap, MLX90632_RAM_3(1), &read_tmp);
	if (ret < 0)
		return ret;
	*ambient_new_raw = (s16)read_tmp;

	ret = regmap_read(regmap, MLX90632_RAM_3(2), &read_tmp);
	if (ret < 0)
		return ret;
	*ambient_old_raw = (s16)read_tmp;

	return ret;
}

static int mlx90632_read_object_raw(struct regmap *regmap,
				    int perform_measurement_ret,
				    s16 *object_new_raw, s16 *object_old_raw)
{
	int ret;
	unsigned int read_tmp;
	s16 read;
	u8 channel = 0;
	u8 channel_old = 0;

	ret = mlx90632_channel_new_select(perform_measurement_ret, &channel,
					  &channel_old);
	if (ret != 0)
		return ret;

	ret = regmap_read(regmap, MLX90632_RAM_2(channel), &read_tmp);
	if (ret < 0)
		return ret;

	read = (s16)read_tmp;

	ret = regmap_read(regmap, MLX90632_RAM_1(channel), &read_tmp);
	if (ret < 0)
		return ret;
	*object_new_raw = (read + (s16)read_tmp) / 2;

	ret = regmap_read(regmap, MLX90632_RAM_2(channel_old), &read_tmp);
	if (ret < 0)
		return ret;
	read = (s16)read_tmp;

	ret = regmap_read(regmap, MLX90632_RAM_1(channel_old), &read_tmp);
	if (ret < 0)
		return ret;
	*object_old_raw = (read + (s16)read_tmp) / 2;

	return ret;
}

static int mlx90632_read_all_channel(struct mlx90632_data *data,
				     s16 *ambient_new_raw, s16 *ambient_old_raw,
				     s16 *object_new_raw, s16 *object_old_raw)
{
	s32 ret, measurement;

	mutex_lock(&data->lock);
	measurement = mlx90632_perform_measurement(data);
	if (measurement < 0) {
		ret = measurement;
		goto read_unlock;
	}
	ret = mlx90632_read_ambient_raw(data->regmap, ambient_new_raw,
					ambient_old_raw);
	if (ret < 0)
		goto read_unlock;

	ret = mlx90632_read_object_raw(data->regmap, measurement,
				       object_new_raw, object_old_raw);
read_unlock:
	mutex_unlock(&data->lock);
	return ret;
}

static int mlx90632_read_ambient_raw_extended(struct regmap *regmap,
					      s16 *ambient_new_raw, s16 *ambient_old_raw)
{
	unsigned int read_tmp;
	int ret;

	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1, &read_tmp);
	if (ret < 0)
		return ret;
	*ambient_new_raw = (s16)read_tmp;

	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2, &read_tmp);
	if (ret < 0)
		return ret;
	*ambient_old_raw = (s16)read_tmp;

	return 0;
}

static int mlx90632_read_object_raw_extended(struct regmap *regmap, s16 *object_new_raw)
{
	unsigned int read_tmp;
	s32 read;
	int ret;

	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_1, &read_tmp);
	if (ret < 0)
		return ret;
	read = (s16)read_tmp;

	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_2, &read_tmp);
	if (ret < 0)
		return ret;
	read = read - (s16)read_tmp;

	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_3, &read_tmp);
	if (ret < 0)
		return ret;
	read = read - (s16)read_tmp;

	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_4, &read_tmp);
	if (ret < 0)
		return ret;
	read = (read + (s16)read_tmp) / 2;

	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_5, &read_tmp);
	if (ret < 0)
		return ret;
	read = read + (s16)read_tmp;

	ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_6, &read_tmp);
	if (ret < 0)
		return ret;
	read = read + (s16)read_tmp;

	if (read > S16_MAX || read < S16_MIN)
		return -ERANGE;

	*object_new_raw = read;

	return 0;
}

static int mlx90632_read_all_channel_extended(struct mlx90632_data *data, s16 *object_new_raw,
					      s16 *ambient_new_raw, s16 *ambient_old_raw)
{
	s32 ret, meas;

	mutex_lock(&data->lock);
	ret = mlx90632_set_meas_type(data->regmap, MLX90632_MTYP_EXTENDED);
	if (ret < 0)
		goto read_unlock;

	ret = read_poll_timeout(mlx90632_perform_measurement, meas, meas == 19,
				50000, 800000, false, data);
	if (ret != 0)
		goto read_unlock;

	ret = mlx90632_read_object_raw_extended(data->regmap, object_new_raw);
	if (ret < 0)
		goto read_unlock;

	ret = mlx90632_read_ambient_raw_extended(data->regmap, ambient_new_raw, ambient_old_raw);

read_unlock:
	(void) mlx90632_set_meas_type(data->regmap, MLX90632_MTYP_MEDICAL);

	mutex_unlock(&data->lock);
	return ret;
}

static int mlx90632_read_ee_register(struct regmap *regmap, u16 reg_lsb,
				     s32 *reg_value)
{
	s32 ret;
	unsigned int read;
	u32 value;

	ret = regmap_read(regmap, reg_lsb, &read);
	if (ret < 0)
		return ret;

	value = read;

	ret = regmap_read(regmap, reg_lsb + 1, &read);
	if (ret < 0)
		return ret;

	*reg_value = (read << 16) | (value & 0xffff);

	return 0;
}

static s64 mlx90632_preprocess_temp_amb(s16 ambient_new_raw,
					s16 ambient_old_raw, s16 Gb)
{
	s64 VR_Ta, kGb, tmp;

	kGb = ((s64)Gb * 1000LL) >> 10ULL;
	VR_Ta = (s64)ambient_old_raw * 1000000LL +
		kGb * div64_s64(((s64)ambient_new_raw * 1000LL),
			(MLX90632_REF_3));
	tmp = div64_s64(
			 div64_s64(((s64)ambient_new_raw * 1000000000000LL),
				   (MLX90632_REF_3)), VR_Ta);
	return div64_s64(tmp << 19ULL, 1000LL);
}

static s64 mlx90632_preprocess_temp_obj(s16 object_new_raw, s16 object_old_raw,
					s16 ambient_new_raw,
					s16 ambient_old_raw, s16 Ka)
{
	s64 VR_IR, kKa, tmp;

	kKa = ((s64)Ka * 1000LL) >> 10ULL;
	VR_IR = (s64)ambient_old_raw * 1000000LL +
		kKa * div64_s64(((s64)ambient_new_raw * 1000LL),
			(MLX90632_REF_3));
	tmp = div64_s64(
			div64_s64(((s64)((object_new_raw + object_old_raw) / 2)
				   * 1000000000000LL), (MLX90632_REF_12)),
			VR_IR);
	return div64_s64((tmp << 19ULL), 1000LL);
}

static s64 mlx90632_preprocess_temp_obj_extended(s16 object_new_raw, s16 ambient_new_raw,
						 s16 ambient_old_raw, s16 Ka)
{
	s64 VR_IR, kKa, tmp;

	kKa = ((s64)Ka * 1000LL) >> 10ULL;
	VR_IR = (s64)ambient_old_raw * 1000000LL +
		kKa * div64_s64((s64)ambient_new_raw * 1000LL,
				MLX90632_REF_3);
	tmp = div64_s64(
			div64_s64((s64) object_new_raw * 1000000000000LL, MLX90632_REF_12),
			VR_IR);
	return div64_s64(tmp << 19ULL, 1000LL);
}

static s32 mlx90632_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw,
				      s32 P_T, s32 P_R, s32 P_G, s32 P_O, s16 Gb)
{
	s64 Asub, Bsub, Ablock, Bblock, Cblock, AMB, sum;

	AMB = mlx90632_preprocess_temp_amb(ambient_new_raw, ambient_old_raw,
					   Gb);
	Asub = ((s64)P_T * 10000000000LL) >> 44ULL;
	Bsub = AMB - (((s64)P_R * 1000LL) >> 8ULL);
	Ablock = Asub * (Bsub * Bsub);
	Bblock = (div64_s64(Bsub * 10000000LL, P_G)) << 20ULL;
	Cblock = ((s64)P_O * 10000000000LL) >> 8ULL;

	sum = div64_s64(Ablock, 1000000LL) + Bblock + Cblock;

	return div64_s64(sum, 10000000LL);
}

static s32 mlx90632_calc_temp_object_iteration(s32 prev_object_temp, s64 object,
					       s64 TAdut, s64 TAdut4, s32 Fa, s32 Fb,
					       s32 Ga, s16 Ha, s16 Hb,
					       u16 emissivity)
{
	s64 calcedKsTO, calcedKsTA, ir_Alpha, Alpha_corr;
	s64 Ha_customer, Hb_customer;

	Ha_customer = ((s64)Ha * 1000000LL) >> 14ULL;
	Hb_customer = ((s64)Hb * 100) >> 10ULL;

	calcedKsTO = ((s64)((s64)Ga * (prev_object_temp - 25 * 1000LL)
			     * 1000LL)) >> 36LL;
	calcedKsTA = ((s64)(Fb * (TAdut - 25 * 1000000LL))) >> 36LL;
	Alpha_corr = div64_s64((((s64)(Fa * 10000000000LL) >> 46LL)
				* Ha_customer), 1000LL);
	Alpha_corr *= ((s64)(1 * 1000000LL + calcedKsTO + calcedKsTA));
	Alpha_corr = emissivity * div64_s64(Alpha_corr, 100000LL);
	Alpha_corr = div64_s64(Alpha_corr, 1000LL);
	ir_Alpha = div64_s64((s64)object * 10000000LL, Alpha_corr);

	return (int_sqrt64(int_sqrt64(ir_Alpha * 1000000000000LL + TAdut4))
		- 27315 - Hb_customer) * 10;
}

static s64 mlx90632_calc_ta4(s64 TAdut, s64 scale)
{
	return (div64_s64(TAdut, scale) + 27315) *
		(div64_s64(TAdut, scale) + 27315) *
		(div64_s64(TAdut, scale) + 27315) *
		(div64_s64(TAdut, scale) + 27315);
}

static s32 mlx90632_calc_temp_object(s64 object, s64 ambient, s32 Ea, s32 Eb,
				     s32 Fa, s32 Fb, s32 Ga, s16 Ha, s16 Hb,
				     u16 tmp_emi)
{
	s64 kTA, kTA0, TAdut, TAdut4;
	s64 temp = 25000;
	s8 i;

	kTA = (Ea * 1000LL) >> 16LL;
	kTA0 = (Eb * 1000LL) >> 8LL;
	TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 25 * 1000000LL;
	TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL);

	/* Iterations of calculation as described in datasheet */
	for (i = 0; i < 5; ++i) {
		temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TAdut4,
							   Fa, Fb, Ga, Ha, Hb,
							   tmp_emi);
	}
	return temp;
}

static s32 mlx90632_calc_temp_object_extended(s64 object, s64 ambient, s64 reflected,
					      s32 Ea, s32 Eb, s32 Fa, s32 Fb, s32 Ga,
					      s16 Ha, s16 Hb, u16 tmp_emi)
{
	s64 kTA, kTA0, TAdut, TAdut4, Tr4, TaTr4;
	s64 temp = 25000;
	s8 i;

	kTA = (Ea * 1000LL) >> 16LL;
	kTA0 = (Eb * 1000LL) >> 8LL;
	TAdut = div64_s64((ambient - kTA0) * 1000000LL, kTA) + 25 * 1000000LL;
	Tr4 = mlx90632_calc_ta4(reflected, 10);
	TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL);
	TaTr4 = Tr4 - div64_s64(Tr4 - TAdut4, tmp_emi) * 1000;

	/* Iterations of calculation as described in datasheet */
	for (i = 0; i < 5; ++i) {
		temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TaTr4,
							   Fa / 2, Fb, Ga, Ha, Hb,
							   tmp_emi);
	}

	return temp;
}

static int mlx90632_calc_object_dsp105(struct mlx90632_data *data, int *val)
{
	s32 ret;
	s32 Ea, Eb, Fa, Fb, Ga;
	unsigned int read_tmp;
	s16 Ha, Hb, Gb, Ka;
	s16 ambient_new_raw, ambient_old_raw, object_new_raw, object_old_raw;
	s64 object, ambient;

	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ea, &Ea);
	if (ret < 0)
		return ret;
	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Eb, &Eb);
	if (ret < 0)
		return ret;
	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fa, &Fa);
	if (ret < 0)
		return ret;
	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fb, &Fb);
	if (ret < 0)
		return ret;
	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ga, &Ga);
	if (ret < 0)
		return ret;
	ret = regmap_read(data->regmap, MLX90632_EE_Ha, &read_tmp);
	if (ret < 0)
		return ret;
	Ha = (s16)read_tmp;
	ret = regmap_read(data->regmap, MLX90632_EE_Hb, &read_tmp);
	if (ret < 0)
		return ret;
	Hb = (s16)read_tmp;
	ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp);
	if (ret < 0)
		return ret;
	Gb = (s16)read_tmp;
	ret = regmap_read(data->regmap, MLX90632_EE_Ka, &read_tmp);
	if (ret < 0)
		return ret;
	Ka = (s16)read_tmp;

	ret = mlx90632_read_all_channel(data,
					&ambient_new_raw, &ambient_old_raw,
					&object_new_raw, &object_old_raw);
	if (ret < 0)
		return ret;

	if (object_new_raw > MLX90632_EXTENDED_LIMIT &&
	    data->mtyp == MLX90632_MTYP_EXTENDED) {
		ret = mlx90632_read_all_channel_extended(data, &object_new_raw,
							 &ambient_new_raw, &ambient_old_raw);
		if (ret < 0)
			return ret;

		/* Use extended mode calculations */
		ambient = mlx90632_preprocess_temp_amb(ambient_new_raw,
						       ambient_old_raw, Gb);
		object = mlx90632_preprocess_temp_obj_extended(object_new_raw,
							       ambient_new_raw,
							       ambient_old_raw, Ka);
		*val = mlx90632_calc_temp_object_extended(object, ambient,
							  data->object_ambient_temperature,
							  Ea, Eb, Fa, Fb, Ga,
							  Ha, Hb, data->emissivity);
		return 0;
	}

	ambient = mlx90632_preprocess_temp_amb(ambient_new_raw,
					       ambient_old_raw, Gb);
	object = mlx90632_preprocess_temp_obj(object_new_raw,
					      object_old_raw,
					      ambient_new_raw,
					      ambient_old_raw, Ka);

	*val = mlx90632_calc_temp_object(object, ambient, Ea, Eb, Fa, Fb, Ga,
					 Ha, Hb, data->emissivity);
	return 0;
}

static int mlx90632_calc_ambient_dsp105(struct mlx90632_data *data, int *val)
{
	s32 ret;
	unsigned int read_tmp;
	s32 PT, PR, PG, PO;
	s16 Gb;
	s16 ambient_new_raw, ambient_old_raw;

	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_R, &PR);
	if (ret < 0)
		return ret;
	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_G, &PG);
	if (ret < 0)
		return ret;
	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_T, &PT);
	if (ret < 0)
		return ret;
	ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_O, &PO);
	if (ret < 0)
		return ret;
	ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp);
	if (ret < 0)
		return ret;
	Gb = (s16)read_tmp;

	ret = mlx90632_read_ambient_raw(data->regmap, &ambient_new_raw,
					&ambient_old_raw);
	if (ret < 0)
		return ret;
	*val = mlx90632_calc_temp_ambient(ambient_new_raw, ambient_old_raw,
					  PT, PR, PG, PO, Gb);
	return ret;
}

static int mlx90632_read_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *channel, int *val,
			     int *val2, long mask)
{
	struct mlx90632_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_PROCESSED:
		switch (channel->channel2) {
		case IIO_MOD_TEMP_AMBIENT:
			ret = mlx90632_calc_ambient_dsp105(data, val);
			if (ret < 0)
				return ret;
			return IIO_VAL_INT;
		case IIO_MOD_TEMP_OBJECT:
			ret = mlx90632_calc_object_dsp105(data, val);
			if (ret < 0)
				return ret;
			return IIO_VAL_INT;
		default:
			return -EINVAL;
		}
	case IIO_CHAN_INFO_CALIBEMISSIVITY:
		if (data->emissivity == 1000) {
			*val = 1;
			*val2 = 0;
		} else {
			*val = 0;
			*val2 = data->emissivity * 1000;
		}
		return IIO_VAL_INT_PLUS_MICRO;
	case IIO_CHAN_INFO_CALIBAMBIENT:
		*val = data->object_ambient_temperature;
		return IIO_VAL_INT;
	default:
		return -EINVAL;
	}
}

static int mlx90632_write_raw(struct iio_dev *indio_dev,
			      struct iio_chan_spec const *channel, int val,
			      int val2, long mask)
{
	struct mlx90632_data *data = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_CALIBEMISSIVITY:
		/* Confirm we are within 0 and 1.0 */
		if (val < 0 || val2 < 0 || val > 1 ||
		    (val == 1 && val2 != 0))
			return -EINVAL;
		data->emissivity = val * 1000 + val2 / 1000;
		return 0;
	case IIO_CHAN_INFO_CALIBAMBIENT:
		data->object_ambient_temperature = val;
		return 0;
	default:
		return -EINVAL;
	}
}

static const struct iio_chan_spec mlx90632_channels[] = {
	{
		.type = IIO_TEMP,
		.modified = 1,
		.channel2 = IIO_MOD_TEMP_AMBIENT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
	},
	{
		.type = IIO_TEMP,
		.modified = 1,
		.channel2 = IIO_MOD_TEMP_OBJECT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
			BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | BIT(IIO_CHAN_INFO_CALIBAMBIENT),
	},
};

static const struct iio_info mlx90632_info = {
	.read_raw = mlx90632_read_raw,
	.write_raw = mlx90632_write_raw,
};

static int mlx90632_sleep(struct mlx90632_data *data)
{
	regcache_mark_dirty(data->regmap);

	dev_dbg(&data->client->dev, "Requesting sleep");
	return mlx90632_pwr_set_sleep_step(data->regmap);
}

static int mlx90632_wakeup(struct mlx90632_data *data)
{
	int ret;

	ret = regcache_sync(data->regmap);
	if (ret < 0) {
		dev_err(&data->client->dev,
			"Failed to sync regmap registers: %d\n", ret);
		return ret;
	}

	dev_dbg(&data->client->dev, "Requesting wake-up\n");
	return mlx90632_pwr_continuous(data->regmap);
}

static int mlx90632_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct iio_dev *indio_dev;
	struct mlx90632_data *mlx90632;
	struct regmap *regmap;
	int ret;
	unsigned int read;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*mlx90632));
	if (!indio_dev) {
		dev_err(&client->dev, "Failed to allocate device\n");
		return -ENOMEM;
	}

	regmap = devm_regmap_init_i2c(client, &mlx90632_regmap);
	if (IS_ERR(regmap)) {
		ret = PTR_ERR(regmap);
		dev_err(&client->dev, "Failed to allocate regmap: %d\n", ret);
		return ret;
	}

	mlx90632 = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	mlx90632->client = client;
	mlx90632->regmap = regmap;
	mlx90632->mtyp = MLX90632_MTYP_MEDICAL;

	mutex_init(&mlx90632->lock);
	indio_dev->name = id->name;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->info = &mlx90632_info;
	indio_dev->channels = mlx90632_channels;
	indio_dev->num_channels = ARRAY_SIZE(mlx90632_channels);

	ret = mlx90632_wakeup(mlx90632);
	if (ret < 0) {
		dev_err(&client->dev, "Wakeup failed: %d\n", ret);
		return ret;
	}

	ret = regmap_read(mlx90632->regmap, MLX90632_EE_VERSION, &read);
	if (ret < 0) {
		dev_err(&client->dev, "read of version failed: %d\n", ret);
		return ret;
	}
	read = read & MLX90632_ID_MASK;
	if (read == MLX90632_ID_MEDICAL) {
		dev_dbg(&client->dev,
			"Detected Medical EEPROM calibration %x\n", read);
	} else if (read == MLX90632_ID_CONSUMER) {
		dev_dbg(&client->dev,
			"Detected Consumer EEPROM calibration %x\n", read);
	} else if (read == MLX90632_ID_EXTENDED) {
		dev_dbg(&client->dev,
			"Detected Extended range EEPROM calibration %x\n", read);
		mlx90632->mtyp = MLX90632_MTYP_EXTENDED;
	} else if ((read & MLX90632_DSP_MASK) == MLX90632_DSP_VERSION) {
		dev_dbg(&client->dev,
			"Detected Unknown EEPROM calibration %x\n", read);
	} else {
		dev_err(&client->dev,
			"Wrong DSP version %x (expected %x)\n",
			read, MLX90632_DSP_VERSION);
		return -EPROTONOSUPPORT;
	}

	mlx90632->emissivity = 1000;
	mlx90632->object_ambient_temperature = 25000; /* 25 degrees milliCelsius */

	pm_runtime_disable(&client->dev);
	ret = pm_runtime_set_active(&client->dev);
	if (ret < 0) {
		mlx90632_sleep(mlx90632);
		return ret;
	}
	pm_runtime_enable(&client->dev);
	pm_runtime_set_autosuspend_delay(&client->dev, MLX90632_SLEEP_DELAY_MS);
	pm_runtime_use_autosuspend(&client->dev);

	return iio_device_register(indio_dev);
}

static int mlx90632_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct mlx90632_data *data = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);

	pm_runtime_disable(&client->dev);
	pm_runtime_set_suspended(&client->dev);
	pm_runtime_put_noidle(&client->dev);

	mlx90632_sleep(data);

	return 0;
}

static const struct i2c_device_id mlx90632_id[] = {
	{ "mlx90632", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mlx90632_id);

static const struct of_device_id mlx90632_of_match[] = {
	{ .compatible = "melexis,mlx90632" },
	{ }
};
MODULE_DEVICE_TABLE(of, mlx90632_of_match);

static int __maybe_unused mlx90632_pm_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct mlx90632_data *data = iio_priv(indio_dev);

	return mlx90632_sleep(data);
}

static int __maybe_unused mlx90632_pm_resume(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct mlx90632_data *data = iio_priv(indio_dev);

	return mlx90632_wakeup(data);
}

static UNIVERSAL_DEV_PM_OPS(mlx90632_pm_ops, mlx90632_pm_suspend,
			    mlx90632_pm_resume, NULL);

static struct i2c_driver mlx90632_driver = {
	.driver = {
		.name	= "mlx90632",
		.of_match_table = mlx90632_of_match,
		.pm	= &mlx90632_pm_ops,
	},
	.probe = mlx90632_probe,
	.remove = mlx90632_remove,
	.id_table = mlx90632_id,
};
module_i2c_driver(mlx90632_driver);

MODULE_AUTHOR("Crt Mori <cmo@melexis.com>");
MODULE_DESCRIPTION("Melexis MLX90632 contactless Infra Red temperature sensor driver");
MODULE_LICENSE("GPL v2");