summaryrefslogtreecommitdiffstats
path: root/drivers/media/i2c/ov2740.c
blob: 41d4f85470fd21056ebe36efcbb5a9fbcc02211b (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
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2020 Intel Corporation.

#include <asm/unaligned.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/nvmem-provider.h>
#include <linux/regmap.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>

#define OV2740_LINK_FREQ_360MHZ		360000000ULL
#define OV2740_SCLK			72000000LL
#define OV2740_MCLK			19200000
#define OV2740_DATA_LANES		2
#define OV2740_RGB_DEPTH		10

#define OV2740_REG_CHIP_ID		0x300a
#define OV2740_CHIP_ID			0x2740

#define OV2740_REG_MODE_SELECT		0x0100
#define OV2740_MODE_STANDBY		0x00
#define OV2740_MODE_STREAMING		0x01

/* vertical-timings from sensor */
#define OV2740_REG_VTS			0x380e
#define OV2740_VTS_DEF			0x088a
#define OV2740_VTS_MIN			0x0460
#define OV2740_VTS_MAX			0x7fff

/* horizontal-timings from sensor */
#define OV2740_REG_HTS			0x380c

/* Exposure controls from sensor */
#define OV2740_REG_EXPOSURE		0x3500
#define OV2740_EXPOSURE_MIN		4
#define OV2740_EXPOSURE_MAX_MARGIN	8
#define OV2740_EXPOSURE_STEP		1

/* Analog gain controls from sensor */
#define OV2740_REG_ANALOG_GAIN		0x3508
#define OV2740_ANAL_GAIN_MIN		128
#define OV2740_ANAL_GAIN_MAX		1983
#define OV2740_ANAL_GAIN_STEP		1

/* Digital gain controls from sensor */
#define OV2740_REG_MWB_R_GAIN		0x500a
#define OV2740_REG_MWB_G_GAIN		0x500c
#define OV2740_REG_MWB_B_GAIN		0x500e
#define OV2740_DGTL_GAIN_MIN		1024
#define OV2740_DGTL_GAIN_MAX		4095
#define OV2740_DGTL_GAIN_STEP		1
#define OV2740_DGTL_GAIN_DEFAULT	1024

/* Test Pattern Control */
#define OV2740_REG_TEST_PATTERN		0x5040
#define OV2740_TEST_PATTERN_ENABLE	BIT(7)
#define OV2740_TEST_PATTERN_BAR_SHIFT	2

/* Group Access */
#define OV2740_REG_GROUP_ACCESS		0x3208
#define OV2740_GROUP_HOLD_START		0x0
#define OV2740_GROUP_HOLD_END		0x10
#define OV2740_GROUP_HOLD_LAUNCH	0xa0

/* ISP CTRL00 */
#define OV2740_REG_ISP_CTRL00		0x5000
/* ISP CTRL01 */
#define OV2740_REG_ISP_CTRL01		0x5001
/* Customer Addresses: 0x7010 - 0x710F */
#define CUSTOMER_USE_OTP_SIZE		0x100
/* OTP registers from sensor */
#define OV2740_REG_OTP_CUSTOMER		0x7010

struct nvm_data {
	struct nvmem_device *nvmem;
	struct regmap *regmap;
	char *nvm_buffer;
};

enum {
	OV2740_LINK_FREQ_360MHZ_INDEX,
};

struct ov2740_reg {
	u16 address;
	u8 val;
};

struct ov2740_reg_list {
	u32 num_of_regs;
	const struct ov2740_reg *regs;
};

struct ov2740_link_freq_config {
	const struct ov2740_reg_list reg_list;
};

struct ov2740_mode {
	/* Frame width in pixels */
	u32 width;

	/* Frame height in pixels */
	u32 height;

	/* Horizontal timining size */
	u32 hts;

	/* Default vertical timining size */
	u32 vts_def;

	/* Min vertical timining size */
	u32 vts_min;

	/* Link frequency needed for this resolution */
	u32 link_freq_index;

	/* Sensor register settings for this resolution */
	const struct ov2740_reg_list reg_list;
};

static const struct ov2740_reg mipi_data_rate_720mbps[] = {
	{0x0103, 0x01},
	{0x0302, 0x4b},
	{0x030d, 0x4b},
	{0x030e, 0x02},
	{0x030a, 0x01},
	{0x0312, 0x11},
};

static const struct ov2740_reg mode_1932x1092_regs[] = {
	{0x3000, 0x00},
	{0x3018, 0x32},
	{0x3031, 0x0a},
	{0x3080, 0x08},
	{0x3083, 0xB4},
	{0x3103, 0x00},
	{0x3104, 0x01},
	{0x3106, 0x01},
	{0x3500, 0x00},
	{0x3501, 0x44},
	{0x3502, 0x40},
	{0x3503, 0x88},
	{0x3507, 0x00},
	{0x3508, 0x00},
	{0x3509, 0x80},
	{0x350c, 0x00},
	{0x350d, 0x80},
	{0x3510, 0x00},
	{0x3511, 0x00},
	{0x3512, 0x20},
	{0x3632, 0x00},
	{0x3633, 0x10},
	{0x3634, 0x10},
	{0x3635, 0x10},
	{0x3645, 0x13},
	{0x3646, 0x81},
	{0x3636, 0x10},
	{0x3651, 0x0a},
	{0x3656, 0x02},
	{0x3659, 0x04},
	{0x365a, 0xda},
	{0x365b, 0xa2},
	{0x365c, 0x04},
	{0x365d, 0x1d},
	{0x365e, 0x1a},
	{0x3662, 0xd7},
	{0x3667, 0x78},
	{0x3669, 0x0a},
	{0x366a, 0x92},
	{0x3700, 0x54},
	{0x3702, 0x10},
	{0x3706, 0x42},
	{0x3709, 0x30},
	{0x370b, 0xc2},
	{0x3714, 0x63},
	{0x3715, 0x01},
	{0x3716, 0x00},
	{0x371a, 0x3e},
	{0x3732, 0x0e},
	{0x3733, 0x10},
	{0x375f, 0x0e},
	{0x3768, 0x30},
	{0x3769, 0x44},
	{0x376a, 0x22},
	{0x377b, 0x20},
	{0x377c, 0x00},
	{0x377d, 0x0c},
	{0x3798, 0x00},
	{0x37a1, 0x55},
	{0x37a8, 0x6d},
	{0x37c2, 0x04},
	{0x37c5, 0x00},
	{0x37c8, 0x00},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x00},
	{0x3803, 0x00},
	{0x3804, 0x07},
	{0x3805, 0x8f},
	{0x3806, 0x04},
	{0x3807, 0x47},
	{0x3808, 0x07},
	{0x3809, 0x88},
	{0x380a, 0x04},
	{0x380b, 0x40},
	{0x380c, 0x04},
	{0x380d, 0x38},
	{0x380e, 0x04},
	{0x380f, 0x60},
	{0x3810, 0x00},
	{0x3811, 0x04},
	{0x3812, 0x00},
	{0x3813, 0x04},
	{0x3814, 0x01},
	{0x3815, 0x01},
	{0x3820, 0x80},
	{0x3821, 0x46},
	{0x3822, 0x84},
	{0x3829, 0x00},
	{0x382a, 0x01},
	{0x382b, 0x01},
	{0x3830, 0x04},
	{0x3836, 0x01},
	{0x3837, 0x08},
	{0x3839, 0x01},
	{0x383a, 0x00},
	{0x383b, 0x08},
	{0x383c, 0x00},
	{0x3f0b, 0x00},
	{0x4001, 0x20},
	{0x4009, 0x07},
	{0x4003, 0x10},
	{0x4010, 0xe0},
	{0x4016, 0x00},
	{0x4017, 0x10},
	{0x4044, 0x02},
	{0x4304, 0x08},
	{0x4307, 0x30},
	{0x4320, 0x80},
	{0x4322, 0x00},
	{0x4323, 0x00},
	{0x4324, 0x00},
	{0x4325, 0x00},
	{0x4326, 0x00},
	{0x4327, 0x00},
	{0x4328, 0x00},
	{0x4329, 0x00},
	{0x432c, 0x03},
	{0x432d, 0x81},
	{0x4501, 0x84},
	{0x4502, 0x40},
	{0x4503, 0x18},
	{0x4504, 0x04},
	{0x4508, 0x02},
	{0x4601, 0x10},
	{0x4800, 0x00},
	{0x4816, 0x52},
	{0x4837, 0x16},
	{0x5000, 0x7f},
	{0x5001, 0x00},
	{0x5005, 0x38},
	{0x501e, 0x0d},
	{0x5040, 0x00},
	{0x5901, 0x00},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x00},
	{0x3803, 0x00},
	{0x3804, 0x07},
	{0x3805, 0x8f},
	{0x3806, 0x04},
	{0x3807, 0x47},
	{0x3808, 0x07},
	{0x3809, 0x8c},
	{0x380a, 0x04},
	{0x380b, 0x44},
	{0x3810, 0x00},
	{0x3811, 0x00},
	{0x3812, 0x00},
	{0x3813, 0x01},
};

static const char * const ov2740_test_pattern_menu[] = {
	"Disabled",
	"Color Bar",
	"Top-Bottom Darker Color Bar",
	"Right-Left Darker Color Bar",
	"Bottom-Top Darker Color Bar",
};

static const s64 link_freq_menu_items[] = {
	OV2740_LINK_FREQ_360MHZ,
};

static const struct ov2740_link_freq_config link_freq_configs[] = {
	[OV2740_LINK_FREQ_360MHZ_INDEX] = {
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mipi_data_rate_720mbps),
			.regs = mipi_data_rate_720mbps,
		}
	},
};

static const struct ov2740_mode supported_modes[] = {
	{
		.width = 1932,
		.height = 1092,
		.hts = 1080,
		.vts_def = OV2740_VTS_DEF,
		.vts_min = OV2740_VTS_MIN,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mode_1932x1092_regs),
			.regs = mode_1932x1092_regs,
		},
		.link_freq_index = OV2740_LINK_FREQ_360MHZ_INDEX,
	},
};

struct ov2740 {
	struct v4l2_subdev sd;
	struct media_pad pad;
	struct v4l2_ctrl_handler ctrl_handler;

	/* V4L2 Controls */
	struct v4l2_ctrl *link_freq;
	struct v4l2_ctrl *pixel_rate;
	struct v4l2_ctrl *vblank;
	struct v4l2_ctrl *hblank;
	struct v4l2_ctrl *exposure;

	/* Current mode */
	const struct ov2740_mode *cur_mode;

	/* To serialize asynchronus callbacks */
	struct mutex mutex;

	/* Streaming on/off */
	bool streaming;

	/* NVM data inforamtion */
	struct nvm_data *nvm;

	/* True if the device has been identified */
	bool identified;
};

static inline struct ov2740 *to_ov2740(struct v4l2_subdev *subdev)
{
	return container_of(subdev, struct ov2740, sd);
}

static u64 to_pixel_rate(u32 f_index)
{
	u64 pixel_rate = link_freq_menu_items[f_index] * 2 * OV2740_DATA_LANES;

	do_div(pixel_rate, OV2740_RGB_DEPTH);

	return pixel_rate;
}

static u64 to_pixels_per_line(u32 hts, u32 f_index)
{
	u64 ppl = hts * to_pixel_rate(f_index);

	do_div(ppl, OV2740_SCLK);

	return ppl;
}

static int ov2740_read_reg(struct ov2740 *ov2740, u16 reg, u16 len, u32 *val)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov2740->sd);
	struct i2c_msg msgs[2];
	u8 addr_buf[2];
	u8 data_buf[4] = {0};
	int ret;

	if (len > sizeof(data_buf))
		return -EINVAL;

	put_unaligned_be16(reg, addr_buf);
	msgs[0].addr = client->addr;
	msgs[0].flags = 0;
	msgs[0].len = sizeof(addr_buf);
	msgs[0].buf = addr_buf;
	msgs[1].addr = client->addr;
	msgs[1].flags = I2C_M_RD;
	msgs[1].len = len;
	msgs[1].buf = &data_buf[sizeof(data_buf) - len];

	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
	if (ret != ARRAY_SIZE(msgs))
		return ret < 0 ? ret : -EIO;

	*val = get_unaligned_be32(data_buf);

	return 0;
}

static int ov2740_write_reg(struct ov2740 *ov2740, u16 reg, u16 len, u32 val)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov2740->sd);
	u8 buf[6];
	int ret;

	if (len > 4)
		return -EINVAL;

	put_unaligned_be16(reg, buf);
	put_unaligned_be32(val << 8 * (4 - len), buf + 2);

	ret = i2c_master_send(client, buf, len + 2);
	if (ret != len + 2)
		return ret < 0 ? ret : -EIO;

	return 0;
}

static int ov2740_write_reg_list(struct ov2740 *ov2740,
				 const struct ov2740_reg_list *r_list)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov2740->sd);
	unsigned int i;
	int ret;

	for (i = 0; i < r_list->num_of_regs; i++) {
		ret = ov2740_write_reg(ov2740, r_list->regs[i].address, 1,
				       r_list->regs[i].val);
		if (ret) {
			dev_err_ratelimited(&client->dev,
					    "write reg 0x%4.4x return err = %d\n",
					    r_list->regs[i].address, ret);
			return ret;
		}
	}

	return 0;
}

static int ov2740_identify_module(struct ov2740 *ov2740)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov2740->sd);
	int ret;
	u32 val;

	if (ov2740->identified)
		return 0;

	ret = ov2740_read_reg(ov2740, OV2740_REG_CHIP_ID, 3, &val);
	if (ret)
		return ret;

	if (val != OV2740_CHIP_ID) {
		dev_err(&client->dev, "chip id mismatch: %x != %x\n",
			OV2740_CHIP_ID, val);
		return -ENXIO;
	}

	ov2740->identified = true;

	return 0;
}

static int ov2740_update_digital_gain(struct ov2740 *ov2740, u32 d_gain)
{
	int ret;

	ret = ov2740_write_reg(ov2740, OV2740_REG_GROUP_ACCESS, 1,
			       OV2740_GROUP_HOLD_START);
	if (ret)
		return ret;

	ret = ov2740_write_reg(ov2740, OV2740_REG_MWB_R_GAIN, 2, d_gain);
	if (ret)
		return ret;

	ret = ov2740_write_reg(ov2740, OV2740_REG_MWB_G_GAIN, 2, d_gain);
	if (ret)
		return ret;

	ret = ov2740_write_reg(ov2740, OV2740_REG_MWB_B_GAIN, 2, d_gain);
	if (ret)
		return ret;

	ret = ov2740_write_reg(ov2740, OV2740_REG_GROUP_ACCESS, 1,
			       OV2740_GROUP_HOLD_END);
	if (ret)
		return ret;

	ret = ov2740_write_reg(ov2740, OV2740_REG_GROUP_ACCESS, 1,
			       OV2740_GROUP_HOLD_LAUNCH);
	return ret;
}

static int ov2740_test_pattern(struct ov2740 *ov2740, u32 pattern)
{
	if (pattern)
		pattern = (pattern - 1) << OV2740_TEST_PATTERN_BAR_SHIFT |
			  OV2740_TEST_PATTERN_ENABLE;

	return ov2740_write_reg(ov2740, OV2740_REG_TEST_PATTERN, 1, pattern);
}

static int ov2740_set_ctrl(struct v4l2_ctrl *ctrl)
{
	struct ov2740 *ov2740 = container_of(ctrl->handler,
					     struct ov2740, ctrl_handler);
	struct i2c_client *client = v4l2_get_subdevdata(&ov2740->sd);
	s64 exposure_max;
	int ret;

	/* Propagate change of current control to all related controls */
	if (ctrl->id == V4L2_CID_VBLANK) {
		/* Update max exposure while meeting expected vblanking */
		exposure_max = ov2740->cur_mode->height + ctrl->val -
			       OV2740_EXPOSURE_MAX_MARGIN;
		__v4l2_ctrl_modify_range(ov2740->exposure,
					 ov2740->exposure->minimum,
					 exposure_max, ov2740->exposure->step,
					 exposure_max);
	}

	/* V4L2 controls values will be applied only when power is already up */
	if (!pm_runtime_get_if_in_use(&client->dev))
		return 0;

	switch (ctrl->id) {
	case V4L2_CID_ANALOGUE_GAIN:
		ret = ov2740_write_reg(ov2740, OV2740_REG_ANALOG_GAIN, 2,
				       ctrl->val);
		break;

	case V4L2_CID_DIGITAL_GAIN:
		ret = ov2740_update_digital_gain(ov2740, ctrl->val);
		break;

	case V4L2_CID_EXPOSURE:
		/* 4 least significant bits of expsoure are fractional part */
		ret = ov2740_write_reg(ov2740, OV2740_REG_EXPOSURE, 3,
				       ctrl->val << 4);
		break;

	case V4L2_CID_VBLANK:
		ret = ov2740_write_reg(ov2740, OV2740_REG_VTS, 2,
				       ov2740->cur_mode->height + ctrl->val);
		break;

	case V4L2_CID_TEST_PATTERN:
		ret = ov2740_test_pattern(ov2740, ctrl->val);
		break;

	default:
		ret = -EINVAL;
		break;
	}

	pm_runtime_put(&client->dev);

	return ret;
}

static const struct v4l2_ctrl_ops ov2740_ctrl_ops = {
	.s_ctrl = ov2740_set_ctrl,
};

static int ov2740_init_controls(struct ov2740 *ov2740)
{
	struct v4l2_ctrl_handler *ctrl_hdlr;
	const struct ov2740_mode *cur_mode;
	s64 exposure_max, h_blank, pixel_rate;
	u32 vblank_min, vblank_max, vblank_default;
	int size;
	int ret;

	ctrl_hdlr = &ov2740->ctrl_handler;
	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 8);
	if (ret)
		return ret;

	ctrl_hdlr->lock = &ov2740->mutex;
	cur_mode = ov2740->cur_mode;
	size = ARRAY_SIZE(link_freq_menu_items);

	ov2740->link_freq = v4l2_ctrl_new_int_menu(ctrl_hdlr, &ov2740_ctrl_ops,
						   V4L2_CID_LINK_FREQ,
						   size - 1, 0,
						   link_freq_menu_items);
	if (ov2740->link_freq)
		ov2740->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	pixel_rate = to_pixel_rate(OV2740_LINK_FREQ_360MHZ_INDEX);
	ov2740->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, &ov2740_ctrl_ops,
					       V4L2_CID_PIXEL_RATE, 0,
					       pixel_rate, 1, pixel_rate);

	vblank_min = cur_mode->vts_min - cur_mode->height;
	vblank_max = OV2740_VTS_MAX - cur_mode->height;
	vblank_default = cur_mode->vts_def - cur_mode->height;
	ov2740->vblank = v4l2_ctrl_new_std(ctrl_hdlr, &ov2740_ctrl_ops,
					   V4L2_CID_VBLANK, vblank_min,
					   vblank_max, 1, vblank_default);

	h_blank = to_pixels_per_line(cur_mode->hts, cur_mode->link_freq_index);
	h_blank -= cur_mode->width;
	ov2740->hblank = v4l2_ctrl_new_std(ctrl_hdlr, &ov2740_ctrl_ops,
					   V4L2_CID_HBLANK, h_blank, h_blank, 1,
					   h_blank);
	if (ov2740->hblank)
		ov2740->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	v4l2_ctrl_new_std(ctrl_hdlr, &ov2740_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,
			  OV2740_ANAL_GAIN_MIN, OV2740_ANAL_GAIN_MAX,
			  OV2740_ANAL_GAIN_STEP, OV2740_ANAL_GAIN_MIN);
	v4l2_ctrl_new_std(ctrl_hdlr, &ov2740_ctrl_ops, V4L2_CID_DIGITAL_GAIN,
			  OV2740_DGTL_GAIN_MIN, OV2740_DGTL_GAIN_MAX,
			  OV2740_DGTL_GAIN_STEP, OV2740_DGTL_GAIN_DEFAULT);
	exposure_max = cur_mode->vts_def - OV2740_EXPOSURE_MAX_MARGIN;
	ov2740->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &ov2740_ctrl_ops,
					     V4L2_CID_EXPOSURE,
					     OV2740_EXPOSURE_MIN, exposure_max,
					     OV2740_EXPOSURE_STEP,
					     exposure_max);
	v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &ov2740_ctrl_ops,
				     V4L2_CID_TEST_PATTERN,
				     ARRAY_SIZE(ov2740_test_pattern_menu) - 1,
				     0, 0, ov2740_test_pattern_menu);
	if (ctrl_hdlr->error) {
		v4l2_ctrl_handler_free(ctrl_hdlr);
		return ctrl_hdlr->error;
	}

	ov2740->sd.ctrl_handler = ctrl_hdlr;

	return 0;
}

static void ov2740_update_pad_format(const struct ov2740_mode *mode,
				     struct v4l2_mbus_framefmt *fmt)
{
	fmt->width = mode->width;
	fmt->height = mode->height;
	fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
	fmt->field = V4L2_FIELD_NONE;
}

static int ov2740_load_otp_data(struct nvm_data *nvm)
{
	struct device *dev = regmap_get_device(nvm->regmap);
	struct ov2740 *ov2740 = to_ov2740(dev_get_drvdata(dev));
	u32 isp_ctrl00 = 0;
	u32 isp_ctrl01 = 0;
	int ret;

	if (nvm->nvm_buffer)
		return 0;

	nvm->nvm_buffer = kzalloc(CUSTOMER_USE_OTP_SIZE, GFP_KERNEL);
	if (!nvm->nvm_buffer)
		return -ENOMEM;

	ret = ov2740_read_reg(ov2740, OV2740_REG_ISP_CTRL00, 1, &isp_ctrl00);
	if (ret) {
		dev_err(dev, "failed to read ISP CTRL00\n");
		goto err;
	}

	ret = ov2740_read_reg(ov2740, OV2740_REG_ISP_CTRL01, 1, &isp_ctrl01);
	if (ret) {
		dev_err(dev, "failed to read ISP CTRL01\n");
		goto err;
	}

	/* Clear bit 5 of ISP CTRL00 */
	ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL00, 1,
			       isp_ctrl00 & ~BIT(5));
	if (ret) {
		dev_err(dev, "failed to set ISP CTRL00\n");
		goto err;
	}

	/* Clear bit 7 of ISP CTRL01 */
	ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL01, 1,
			       isp_ctrl01 & ~BIT(7));
	if (ret) {
		dev_err(dev, "failed to set ISP CTRL01\n");
		goto err;
	}

	ret = ov2740_write_reg(ov2740, OV2740_REG_MODE_SELECT, 1,
			       OV2740_MODE_STREAMING);
	if (ret) {
		dev_err(dev, "failed to set streaming mode\n");
		goto err;
	}

	/*
	 * Users are not allowed to access OTP-related registers and memory
	 * during the 20 ms period after streaming starts (0x100 = 0x01).
	 */
	msleep(20);

	ret = regmap_bulk_read(nvm->regmap, OV2740_REG_OTP_CUSTOMER,
			       nvm->nvm_buffer, CUSTOMER_USE_OTP_SIZE);
	if (ret) {
		dev_err(dev, "failed to read OTP data, ret %d\n", ret);
		goto err;
	}

	ret = ov2740_write_reg(ov2740, OV2740_REG_MODE_SELECT, 1,
			       OV2740_MODE_STANDBY);
	if (ret) {
		dev_err(dev, "failed to set streaming mode\n");
		goto err;
	}

	ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL01, 1, isp_ctrl01);
	if (ret) {
		dev_err(dev, "failed to set ISP CTRL01\n");
		goto err;
	}

	ret = ov2740_write_reg(ov2740, OV2740_REG_ISP_CTRL00, 1, isp_ctrl00);
	if (ret) {
		dev_err(dev, "failed to set ISP CTRL00\n");
		goto err;
	}

	return 0;
err:
	kfree(nvm->nvm_buffer);
	nvm->nvm_buffer = NULL;

	return ret;
}

static int ov2740_start_streaming(struct ov2740 *ov2740)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov2740->sd);
	const struct ov2740_reg_list *reg_list;
	int link_freq_index;
	int ret;

	ret = ov2740_identify_module(ov2740);
	if (ret)
		return ret;

	if (ov2740->nvm)
		ov2740_load_otp_data(ov2740->nvm);

	link_freq_index = ov2740->cur_mode->link_freq_index;
	reg_list = &link_freq_configs[link_freq_index].reg_list;
	ret = ov2740_write_reg_list(ov2740, reg_list);
	if (ret) {
		dev_err(&client->dev, "failed to set plls\n");
		return ret;
	}

	reg_list = &ov2740->cur_mode->reg_list;
	ret = ov2740_write_reg_list(ov2740, reg_list);
	if (ret) {
		dev_err(&client->dev, "failed to set mode\n");
		return ret;
	}

	ret = __v4l2_ctrl_handler_setup(ov2740->sd.ctrl_handler);
	if (ret)
		return ret;

	ret = ov2740_write_reg(ov2740, OV2740_REG_MODE_SELECT, 1,
			       OV2740_MODE_STREAMING);
	if (ret)
		dev_err(&client->dev, "failed to start streaming\n");

	return ret;
}

static void ov2740_stop_streaming(struct ov2740 *ov2740)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov2740->sd);

	if (ov2740_write_reg(ov2740, OV2740_REG_MODE_SELECT, 1,
			     OV2740_MODE_STANDBY))
		dev_err(&client->dev, "failed to stop streaming\n");
}

static int ov2740_set_stream(struct v4l2_subdev *sd, int enable)
{
	struct ov2740 *ov2740 = to_ov2740(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int ret = 0;

	if (ov2740->streaming == enable)
		return 0;

	mutex_lock(&ov2740->mutex);
	if (enable) {
		ret = pm_runtime_resume_and_get(&client->dev);
		if (ret < 0) {
			mutex_unlock(&ov2740->mutex);
			return ret;
		}

		ret = ov2740_start_streaming(ov2740);
		if (ret) {
			enable = 0;
			ov2740_stop_streaming(ov2740);
			pm_runtime_put(&client->dev);
		}
	} else {
		ov2740_stop_streaming(ov2740);
		pm_runtime_put(&client->dev);
	}

	ov2740->streaming = enable;
	mutex_unlock(&ov2740->mutex);

	return ret;
}

static int ov2740_suspend(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct ov2740 *ov2740 = to_ov2740(sd);

	mutex_lock(&ov2740->mutex);
	if (ov2740->streaming)
		ov2740_stop_streaming(ov2740);

	mutex_unlock(&ov2740->mutex);

	return 0;
}

static int ov2740_resume(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct ov2740 *ov2740 = to_ov2740(sd);
	int ret = 0;

	mutex_lock(&ov2740->mutex);
	if (!ov2740->streaming)
		goto exit;

	ret = ov2740_start_streaming(ov2740);
	if (ret) {
		ov2740->streaming = false;
		ov2740_stop_streaming(ov2740);
	}

exit:
	mutex_unlock(&ov2740->mutex);
	return ret;
}

static int ov2740_set_format(struct v4l2_subdev *sd,
			     struct v4l2_subdev_state *sd_state,
			     struct v4l2_subdev_format *fmt)
{
	struct ov2740 *ov2740 = to_ov2740(sd);
	const struct ov2740_mode *mode;
	s32 vblank_def, h_blank;

	mode = v4l2_find_nearest_size(supported_modes,
				      ARRAY_SIZE(supported_modes), width,
				      height, fmt->format.width,
				      fmt->format.height);

	mutex_lock(&ov2740->mutex);
	ov2740_update_pad_format(mode, &fmt->format);
	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		*v4l2_subdev_get_try_format(sd, sd_state, fmt->pad) = fmt->format;
	} else {
		ov2740->cur_mode = mode;
		__v4l2_ctrl_s_ctrl(ov2740->link_freq, mode->link_freq_index);
		__v4l2_ctrl_s_ctrl_int64(ov2740->pixel_rate,
					 to_pixel_rate(mode->link_freq_index));

		/* Update limits and set FPS to default */
		vblank_def = mode->vts_def - mode->height;
		__v4l2_ctrl_modify_range(ov2740->vblank,
					 mode->vts_min - mode->height,
					 OV2740_VTS_MAX - mode->height, 1,
					 vblank_def);
		__v4l2_ctrl_s_ctrl(ov2740->vblank, vblank_def);
		h_blank = to_pixels_per_line(mode->hts, mode->link_freq_index) -
			  mode->width;
		__v4l2_ctrl_modify_range(ov2740->hblank, h_blank, h_blank, 1,
					 h_blank);
	}
	mutex_unlock(&ov2740->mutex);

	return 0;
}

static int ov2740_get_format(struct v4l2_subdev *sd,
			     struct v4l2_subdev_state *sd_state,
			     struct v4l2_subdev_format *fmt)
{
	struct ov2740 *ov2740 = to_ov2740(sd);

	mutex_lock(&ov2740->mutex);
	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
		fmt->format = *v4l2_subdev_get_try_format(&ov2740->sd,
							  sd_state,
							  fmt->pad);
	else
		ov2740_update_pad_format(ov2740->cur_mode, &fmt->format);

	mutex_unlock(&ov2740->mutex);

	return 0;
}

static int ov2740_enum_mbus_code(struct v4l2_subdev *sd,
				 struct v4l2_subdev_state *sd_state,
				 struct v4l2_subdev_mbus_code_enum *code)
{
	if (code->index > 0)
		return -EINVAL;

	code->code = MEDIA_BUS_FMT_SGRBG10_1X10;

	return 0;
}

static int ov2740_enum_frame_size(struct v4l2_subdev *sd,
				  struct v4l2_subdev_state *sd_state,
				  struct v4l2_subdev_frame_size_enum *fse)
{
	if (fse->index >= ARRAY_SIZE(supported_modes))
		return -EINVAL;

	if (fse->code != MEDIA_BUS_FMT_SGRBG10_1X10)
		return -EINVAL;

	fse->min_width = supported_modes[fse->index].width;
	fse->max_width = fse->min_width;
	fse->min_height = supported_modes[fse->index].height;
	fse->max_height = fse->min_height;

	return 0;
}

static int ov2740_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	struct ov2740 *ov2740 = to_ov2740(sd);

	mutex_lock(&ov2740->mutex);
	ov2740_update_pad_format(&supported_modes[0],
				 v4l2_subdev_get_try_format(sd, fh->state, 0));
	mutex_unlock(&ov2740->mutex);

	return 0;
}

static const struct v4l2_subdev_video_ops ov2740_video_ops = {
	.s_stream = ov2740_set_stream,
};

static const struct v4l2_subdev_pad_ops ov2740_pad_ops = {
	.set_fmt = ov2740_set_format,
	.get_fmt = ov2740_get_format,
	.enum_mbus_code = ov2740_enum_mbus_code,
	.enum_frame_size = ov2740_enum_frame_size,
};

static const struct v4l2_subdev_ops ov2740_subdev_ops = {
	.video = &ov2740_video_ops,
	.pad = &ov2740_pad_ops,
};

static const struct media_entity_operations ov2740_subdev_entity_ops = {
	.link_validate = v4l2_subdev_link_validate,
};

static const struct v4l2_subdev_internal_ops ov2740_internal_ops = {
	.open = ov2740_open,
};

static int ov2740_check_hwcfg(struct device *dev)
{
	struct fwnode_handle *ep;
	struct fwnode_handle *fwnode = dev_fwnode(dev);
	struct v4l2_fwnode_endpoint bus_cfg = {
		.bus_type = V4L2_MBUS_CSI2_DPHY
	};
	u32 mclk;
	int ret;
	unsigned int i, j;

	ret = fwnode_property_read_u32(fwnode, "clock-frequency", &mclk);
	if (ret)
		return ret;

	if (mclk != OV2740_MCLK)
		return dev_err_probe(dev, -EINVAL,
				     "external clock %d is not supported\n",
				     mclk);

	ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
	if (!ep)
		return -ENXIO;

	ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
	fwnode_handle_put(ep);
	if (ret)
		return ret;

	if (bus_cfg.bus.mipi_csi2.num_data_lanes != OV2740_DATA_LANES) {
		ret = dev_err_probe(dev, -EINVAL,
				    "number of CSI2 data lanes %d is not supported\n",
				    bus_cfg.bus.mipi_csi2.num_data_lanes);
		goto check_hwcfg_error;
	}

	if (!bus_cfg.nr_of_link_frequencies) {
		ret = dev_err_probe(dev, -EINVAL, "no link frequencies defined\n");
		goto check_hwcfg_error;
	}

	for (i = 0; i < ARRAY_SIZE(link_freq_menu_items); i++) {
		for (j = 0; j < bus_cfg.nr_of_link_frequencies; j++) {
			if (link_freq_menu_items[i] ==
				bus_cfg.link_frequencies[j])
				break;
		}

		if (j == bus_cfg.nr_of_link_frequencies) {
			ret = dev_err_probe(dev, -EINVAL,
					    "no link frequency %lld supported\n",
					    link_freq_menu_items[i]);
			goto check_hwcfg_error;
		}
	}

check_hwcfg_error:
	v4l2_fwnode_endpoint_free(&bus_cfg);

	return ret;
}

static void ov2740_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov2740 *ov2740 = to_ov2740(sd);

	v4l2_async_unregister_subdev(sd);
	media_entity_cleanup(&sd->entity);
	v4l2_ctrl_handler_free(sd->ctrl_handler);
	pm_runtime_disable(&client->dev);
	mutex_destroy(&ov2740->mutex);
}

static int ov2740_nvmem_read(void *priv, unsigned int off, void *val,
			     size_t count)
{
	struct nvm_data *nvm = priv;
	struct device *dev = regmap_get_device(nvm->regmap);
	struct ov2740 *ov2740 = to_ov2740(dev_get_drvdata(dev));
	int ret = 0;

	mutex_lock(&ov2740->mutex);

	if (nvm->nvm_buffer) {
		memcpy(val, nvm->nvm_buffer + off, count);
		goto exit;
	}

	ret = pm_runtime_resume_and_get(dev);
	if (ret < 0) {
		goto exit;
	}

	ret = ov2740_load_otp_data(nvm);
	if (!ret)
		memcpy(val, nvm->nvm_buffer + off, count);

	pm_runtime_put(dev);
exit:
	mutex_unlock(&ov2740->mutex);
	return ret;
}

static int ov2740_register_nvmem(struct i2c_client *client,
				 struct ov2740 *ov2740)
{
	struct nvm_data *nvm;
	struct regmap_config regmap_config = { };
	struct nvmem_config nvmem_config = { };
	struct regmap *regmap;
	struct device *dev = &client->dev;

	nvm = devm_kzalloc(dev, sizeof(*nvm), GFP_KERNEL);
	if (!nvm)
		return -ENOMEM;

	regmap_config.val_bits = 8;
	regmap_config.reg_bits = 16;
	regmap_config.disable_locking = true;
	regmap = devm_regmap_init_i2c(client, &regmap_config);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	nvm->regmap = regmap;

	nvmem_config.name = dev_name(dev);
	nvmem_config.dev = dev;
	nvmem_config.read_only = true;
	nvmem_config.root_only = true;
	nvmem_config.owner = THIS_MODULE;
	nvmem_config.compat = true;
	nvmem_config.base_dev = dev;
	nvmem_config.reg_read = ov2740_nvmem_read;
	nvmem_config.reg_write = NULL;
	nvmem_config.priv = nvm;
	nvmem_config.stride = 1;
	nvmem_config.word_size = 1;
	nvmem_config.size = CUSTOMER_USE_OTP_SIZE;

	nvm->nvmem = devm_nvmem_register(dev, &nvmem_config);
	if (IS_ERR(nvm->nvmem))
		return PTR_ERR(nvm->nvmem);

	ov2740->nvm = nvm;
	return 0;
}

static int ov2740_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct ov2740 *ov2740;
	bool full_power;
	int ret;

	ret = ov2740_check_hwcfg(&client->dev);
	if (ret)
		return dev_err_probe(dev, ret, "failed to check HW configuration\n");

	ov2740 = devm_kzalloc(&client->dev, sizeof(*ov2740), GFP_KERNEL);
	if (!ov2740)
		return -ENOMEM;

	v4l2_i2c_subdev_init(&ov2740->sd, client, &ov2740_subdev_ops);
	full_power = acpi_dev_state_d0(&client->dev);
	if (full_power) {
		ret = ov2740_identify_module(ov2740);
		if (ret)
			return dev_err_probe(dev, ret, "failed to find sensor\n");
	}

	mutex_init(&ov2740->mutex);
	ov2740->cur_mode = &supported_modes[0];
	ret = ov2740_init_controls(ov2740);
	if (ret) {
		dev_err_probe(dev, ret, "failed to init controls\n");
		goto probe_error_v4l2_ctrl_handler_free;
	}

	ov2740->sd.internal_ops = &ov2740_internal_ops;
	ov2740->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	ov2740->sd.entity.ops = &ov2740_subdev_entity_ops;
	ov2740->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
	ov2740->pad.flags = MEDIA_PAD_FL_SOURCE;
	ret = media_entity_pads_init(&ov2740->sd.entity, 1, &ov2740->pad);
	if (ret) {
		dev_err_probe(dev, ret, "failed to init entity pads\n");
		goto probe_error_v4l2_ctrl_handler_free;
	}

	ret = v4l2_async_register_subdev_sensor(&ov2740->sd);
	if (ret < 0) {
		dev_err_probe(dev, ret, "failed to register V4L2 subdev\n");
		goto probe_error_media_entity_cleanup;
	}

	ret = ov2740_register_nvmem(client, ov2740);
	if (ret)
		dev_warn(&client->dev, "register nvmem failed, ret %d\n", ret);

	/* Set the device's state to active if it's in D0 state. */
	if (full_power)
		pm_runtime_set_active(&client->dev);
	pm_runtime_enable(&client->dev);
	pm_runtime_idle(&client->dev);

	return 0;

probe_error_media_entity_cleanup:
	media_entity_cleanup(&ov2740->sd.entity);

probe_error_v4l2_ctrl_handler_free:
	v4l2_ctrl_handler_free(ov2740->sd.ctrl_handler);
	mutex_destroy(&ov2740->mutex);

	return ret;
}

static DEFINE_SIMPLE_DEV_PM_OPS(ov2740_pm_ops, ov2740_suspend, ov2740_resume);

static const struct acpi_device_id ov2740_acpi_ids[] = {
	{"INT3474"},
	{}
};

MODULE_DEVICE_TABLE(acpi, ov2740_acpi_ids);

static struct i2c_driver ov2740_i2c_driver = {
	.driver = {
		.name = "ov2740",
		.pm = pm_sleep_ptr(&ov2740_pm_ops),
		.acpi_match_table = ov2740_acpi_ids,
	},
	.probe = ov2740_probe,
	.remove = ov2740_remove,
	.flags = I2C_DRV_ACPI_WAIVE_D0_PROBE,
};

module_i2c_driver(ov2740_i2c_driver);

MODULE_AUTHOR("Qiu, Tianshu <tian.shu.qiu@intel.com>");
MODULE_AUTHOR("Shawn Tu");
MODULE_AUTHOR("Bingbu Cao <bingbu.cao@intel.com>");
MODULE_DESCRIPTION("OmniVision OV2740 sensor driver");
MODULE_LICENSE("GPL v2");