Free Electrons

Embedded Linux Experts

   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
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
/*
 * Driver for the OV5645 camera sensor.
 *
 * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
 * Copyright (C) 2015 By Tech Design S.L. All Rights Reserved.
 * Copyright (C) 2012-2013 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * Based on:
 * - the OV5645 driver from QC msm-3.10 kernel on codeaurora.org:
 *   https://us.codeaurora.org/cgit/quic/la/kernel/msm-3.10/tree/drivers/
 *       media/platform/msm/camera_v2/sensor/ov5645.c?h=LA.BR.1.2.4_rb1.41
 * - the OV5640 driver posted on linux-media:
 *   https://www.mail-archive.com/linux-media%40vger.kernel.org/msg92671.html
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>

#define OV5645_VOLTAGE_ANALOG               2800000
#define OV5645_VOLTAGE_DIGITAL_CORE         1500000
#define OV5645_VOLTAGE_DIGITAL_IO           1800000

#define OV5645_SYSTEM_CTRL0		0x3008
#define		OV5645_SYSTEM_CTRL0_START	0x02
#define		OV5645_SYSTEM_CTRL0_STOP	0x42
#define OV5645_CHIP_ID_HIGH		0x300a
#define		OV5645_CHIP_ID_HIGH_BYTE	0x56
#define OV5645_CHIP_ID_LOW		0x300b
#define		OV5645_CHIP_ID_LOW_BYTE		0x45
#define OV5645_AWB_MANUAL_CONTROL	0x3406
#define		OV5645_AWB_MANUAL_ENABLE	BIT(0)
#define OV5645_AEC_PK_MANUAL		0x3503
#define		OV5645_AEC_MANUAL_ENABLE	BIT(0)
#define		OV5645_AGC_MANUAL_ENABLE	BIT(1)
#define OV5645_TIMING_TC_REG20		0x3820
#define		OV5645_SENSOR_VFLIP		BIT(1)
#define		OV5645_ISP_VFLIP		BIT(2)
#define OV5645_TIMING_TC_REG21		0x3821
#define		OV5645_SENSOR_MIRROR		BIT(1)
#define OV5645_PRE_ISP_TEST_SETTING_1	0x503d
#define		OV5645_TEST_PATTERN_MASK	0x3
#define		OV5645_SET_TEST_PATTERN(x)	((x) & OV5645_TEST_PATTERN_MASK)
#define		OV5645_TEST_PATTERN_ENABLE	BIT(7)
#define OV5645_SDE_SAT_U		0x5583
#define OV5645_SDE_SAT_V		0x5584

struct reg_value {
	u16 reg;
	u8 val;
};

struct ov5645_mode_info {
	u32 width;
	u32 height;
	const struct reg_value *data;
	u32 data_size;
	u32 pixel_clock;
	u32 link_freq;
};

struct ov5645 {
	struct i2c_client *i2c_client;
	struct device *dev;
	struct v4l2_subdev sd;
	struct media_pad pad;
	struct v4l2_fwnode_endpoint ep;
	struct v4l2_mbus_framefmt fmt;
	struct v4l2_rect crop;
	struct clk *xclk;

	struct regulator *io_regulator;
	struct regulator *core_regulator;
	struct regulator *analog_regulator;

	const struct ov5645_mode_info *current_mode;

	struct v4l2_ctrl_handler ctrls;
	struct v4l2_ctrl *pixel_clock;
	struct v4l2_ctrl *link_freq;

	/* Cached register values */
	u8 aec_pk_manual;
	u8 timing_tc_reg20;
	u8 timing_tc_reg21;

	struct mutex power_lock; /* lock to protect power state */
	int power_count;

	struct gpio_desc *enable_gpio;
	struct gpio_desc *rst_gpio;
};

static inline struct ov5645 *to_ov5645(struct v4l2_subdev *sd)
{
	return container_of(sd, struct ov5645, sd);
}

static const struct reg_value ov5645_global_init_setting[] = {
	{ 0x3103, 0x11 },
	{ 0x3008, 0x82 },
	{ 0x3008, 0x42 },
	{ 0x3103, 0x03 },
	{ 0x3503, 0x07 },
	{ 0x3002, 0x1c },
	{ 0x3006, 0xc3 },
	{ 0x300e, 0x45 },
	{ 0x3017, 0x00 },
	{ 0x3018, 0x00 },
	{ 0x302e, 0x0b },
	{ 0x3037, 0x13 },
	{ 0x3108, 0x01 },
	{ 0x3611, 0x06 },
	{ 0x3500, 0x00 },
	{ 0x3501, 0x01 },
	{ 0x3502, 0x00 },
	{ 0x350a, 0x00 },
	{ 0x350b, 0x3f },
	{ 0x3620, 0x33 },
	{ 0x3621, 0xe0 },
	{ 0x3622, 0x01 },
	{ 0x3630, 0x2e },
	{ 0x3631, 0x00 },
	{ 0x3632, 0x32 },
	{ 0x3633, 0x52 },
	{ 0x3634, 0x70 },
	{ 0x3635, 0x13 },
	{ 0x3636, 0x03 },
	{ 0x3703, 0x5a },
	{ 0x3704, 0xa0 },
	{ 0x3705, 0x1a },
	{ 0x3709, 0x12 },
	{ 0x370b, 0x61 },
	{ 0x370f, 0x10 },
	{ 0x3715, 0x78 },
	{ 0x3717, 0x01 },
	{ 0x371b, 0x20 },
	{ 0x3731, 0x12 },
	{ 0x3901, 0x0a },
	{ 0x3905, 0x02 },
	{ 0x3906, 0x10 },
	{ 0x3719, 0x86 },
	{ 0x3810, 0x00 },
	{ 0x3811, 0x10 },
	{ 0x3812, 0x00 },
	{ 0x3821, 0x01 },
	{ 0x3824, 0x01 },
	{ 0x3826, 0x03 },
	{ 0x3828, 0x08 },
	{ 0x3a19, 0xf8 },
	{ 0x3c01, 0x34 },
	{ 0x3c04, 0x28 },
	{ 0x3c05, 0x98 },
	{ 0x3c07, 0x07 },
	{ 0x3c09, 0xc2 },
	{ 0x3c0a, 0x9c },
	{ 0x3c0b, 0x40 },
	{ 0x3c01, 0x34 },
	{ 0x4001, 0x02 },
	{ 0x4514, 0x00 },
	{ 0x4520, 0xb0 },
	{ 0x460b, 0x37 },
	{ 0x460c, 0x20 },
	{ 0x4818, 0x01 },
	{ 0x481d, 0xf0 },
	{ 0x481f, 0x50 },
	{ 0x4823, 0x70 },
	{ 0x4831, 0x14 },
	{ 0x5000, 0xa7 },
	{ 0x5001, 0x83 },
	{ 0x501d, 0x00 },
	{ 0x501f, 0x00 },
	{ 0x503d, 0x00 },
	{ 0x505c, 0x30 },
	{ 0x5181, 0x59 },
	{ 0x5183, 0x00 },
	{ 0x5191, 0xf0 },
	{ 0x5192, 0x03 },
	{ 0x5684, 0x10 },
	{ 0x5685, 0xa0 },
	{ 0x5686, 0x0c },
	{ 0x5687, 0x78 },
	{ 0x5a00, 0x08 },
	{ 0x5a21, 0x00 },
	{ 0x5a24, 0x00 },
	{ 0x3008, 0x02 },
	{ 0x3503, 0x00 },
	{ 0x5180, 0xff },
	{ 0x5181, 0xf2 },
	{ 0x5182, 0x00 },
	{ 0x5183, 0x14 },
	{ 0x5184, 0x25 },
	{ 0x5185, 0x24 },
	{ 0x5186, 0x09 },
	{ 0x5187, 0x09 },
	{ 0x5188, 0x0a },
	{ 0x5189, 0x75 },
	{ 0x518a, 0x52 },
	{ 0x518b, 0xea },
	{ 0x518c, 0xa8 },
	{ 0x518d, 0x42 },
	{ 0x518e, 0x38 },
	{ 0x518f, 0x56 },
	{ 0x5190, 0x42 },
	{ 0x5191, 0xf8 },
	{ 0x5192, 0x04 },
	{ 0x5193, 0x70 },
	{ 0x5194, 0xf0 },
	{ 0x5195, 0xf0 },
	{ 0x5196, 0x03 },
	{ 0x5197, 0x01 },
	{ 0x5198, 0x04 },
	{ 0x5199, 0x12 },
	{ 0x519a, 0x04 },
	{ 0x519b, 0x00 },
	{ 0x519c, 0x06 },
	{ 0x519d, 0x82 },
	{ 0x519e, 0x38 },
	{ 0x5381, 0x1e },
	{ 0x5382, 0x5b },
	{ 0x5383, 0x08 },
	{ 0x5384, 0x0a },
	{ 0x5385, 0x7e },
	{ 0x5386, 0x88 },
	{ 0x5387, 0x7c },
	{ 0x5388, 0x6c },
	{ 0x5389, 0x10 },
	{ 0x538a, 0x01 },
	{ 0x538b, 0x98 },
	{ 0x5300, 0x08 },
	{ 0x5301, 0x30 },
	{ 0x5302, 0x10 },
	{ 0x5303, 0x00 },
	{ 0x5304, 0x08 },
	{ 0x5305, 0x30 },
	{ 0x5306, 0x08 },
	{ 0x5307, 0x16 },
	{ 0x5309, 0x08 },
	{ 0x530a, 0x30 },
	{ 0x530b, 0x04 },
	{ 0x530c, 0x06 },
	{ 0x5480, 0x01 },
	{ 0x5481, 0x08 },
	{ 0x5482, 0x14 },
	{ 0x5483, 0x28 },
	{ 0x5484, 0x51 },
	{ 0x5485, 0x65 },
	{ 0x5486, 0x71 },
	{ 0x5487, 0x7d },
	{ 0x5488, 0x87 },
	{ 0x5489, 0x91 },
	{ 0x548a, 0x9a },
	{ 0x548b, 0xaa },
	{ 0x548c, 0xb8 },
	{ 0x548d, 0xcd },
	{ 0x548e, 0xdd },
	{ 0x548f, 0xea },
	{ 0x5490, 0x1d },
	{ 0x5580, 0x02 },
	{ 0x5583, 0x40 },
	{ 0x5584, 0x10 },
	{ 0x5589, 0x10 },
	{ 0x558a, 0x00 },
	{ 0x558b, 0xf8 },
	{ 0x5800, 0x3f },
	{ 0x5801, 0x16 },
	{ 0x5802, 0x0e },
	{ 0x5803, 0x0d },
	{ 0x5804, 0x17 },
	{ 0x5805, 0x3f },
	{ 0x5806, 0x0b },
	{ 0x5807, 0x06 },
	{ 0x5808, 0x04 },
	{ 0x5809, 0x04 },
	{ 0x580a, 0x06 },
	{ 0x580b, 0x0b },
	{ 0x580c, 0x09 },
	{ 0x580d, 0x03 },
	{ 0x580e, 0x00 },
	{ 0x580f, 0x00 },
	{ 0x5810, 0x03 },
	{ 0x5811, 0x08 },
	{ 0x5812, 0x0a },
	{ 0x5813, 0x03 },
	{ 0x5814, 0x00 },
	{ 0x5815, 0x00 },
	{ 0x5816, 0x04 },
	{ 0x5817, 0x09 },
	{ 0x5818, 0x0f },
	{ 0x5819, 0x08 },
	{ 0x581a, 0x06 },
	{ 0x581b, 0x06 },
	{ 0x581c, 0x08 },
	{ 0x581d, 0x0c },
	{ 0x581e, 0x3f },
	{ 0x581f, 0x1e },
	{ 0x5820, 0x12 },
	{ 0x5821, 0x13 },
	{ 0x5822, 0x21 },
	{ 0x5823, 0x3f },
	{ 0x5824, 0x68 },
	{ 0x5825, 0x28 },
	{ 0x5826, 0x2c },
	{ 0x5827, 0x28 },
	{ 0x5828, 0x08 },
	{ 0x5829, 0x48 },
	{ 0x582a, 0x64 },
	{ 0x582b, 0x62 },
	{ 0x582c, 0x64 },
	{ 0x582d, 0x28 },
	{ 0x582e, 0x46 },
	{ 0x582f, 0x62 },
	{ 0x5830, 0x60 },
	{ 0x5831, 0x62 },
	{ 0x5832, 0x26 },
	{ 0x5833, 0x48 },
	{ 0x5834, 0x66 },
	{ 0x5835, 0x44 },
	{ 0x5836, 0x64 },
	{ 0x5837, 0x28 },
	{ 0x5838, 0x66 },
	{ 0x5839, 0x48 },
	{ 0x583a, 0x2c },
	{ 0x583b, 0x28 },
	{ 0x583c, 0x26 },
	{ 0x583d, 0xae },
	{ 0x5025, 0x00 },
	{ 0x3a0f, 0x30 },
	{ 0x3a10, 0x28 },
	{ 0x3a1b, 0x30 },
	{ 0x3a1e, 0x26 },
	{ 0x3a11, 0x60 },
	{ 0x3a1f, 0x14 },
	{ 0x0601, 0x02 },
	{ 0x3008, 0x42 },
	{ 0x3008, 0x02 }
};

static const struct reg_value ov5645_setting_sxga[] = {
	{ 0x3612, 0xa9 },
	{ 0x3614, 0x50 },
	{ 0x3618, 0x00 },
	{ 0x3034, 0x18 },
	{ 0x3035, 0x21 },
	{ 0x3036, 0x70 },
	{ 0x3600, 0x09 },
	{ 0x3601, 0x43 },
	{ 0x3708, 0x66 },
	{ 0x370c, 0xc3 },
	{ 0x3800, 0x00 },
	{ 0x3801, 0x00 },
	{ 0x3802, 0x00 },
	{ 0x3803, 0x06 },
	{ 0x3804, 0x0a },
	{ 0x3805, 0x3f },
	{ 0x3806, 0x07 },
	{ 0x3807, 0x9d },
	{ 0x3808, 0x05 },
	{ 0x3809, 0x00 },
	{ 0x380a, 0x03 },
	{ 0x380b, 0xc0 },
	{ 0x380c, 0x07 },
	{ 0x380d, 0x68 },
	{ 0x380e, 0x03 },
	{ 0x380f, 0xd8 },
	{ 0x3813, 0x06 },
	{ 0x3814, 0x31 },
	{ 0x3815, 0x31 },
	{ 0x3820, 0x47 },
	{ 0x3a02, 0x03 },
	{ 0x3a03, 0xd8 },
	{ 0x3a08, 0x01 },
	{ 0x3a09, 0xf8 },
	{ 0x3a0a, 0x01 },
	{ 0x3a0b, 0xa4 },
	{ 0x3a0e, 0x02 },
	{ 0x3a0d, 0x02 },
	{ 0x3a14, 0x03 },
	{ 0x3a15, 0xd8 },
	{ 0x3a18, 0x00 },
	{ 0x4004, 0x02 },
	{ 0x4005, 0x18 },
	{ 0x4300, 0x32 },
	{ 0x4202, 0x00 }
};

static const struct reg_value ov5645_setting_1080p[] = {
	{ 0x3612, 0xab },
	{ 0x3614, 0x50 },
	{ 0x3618, 0x04 },
	{ 0x3034, 0x18 },
	{ 0x3035, 0x11 },
	{ 0x3036, 0x54 },
	{ 0x3600, 0x08 },
	{ 0x3601, 0x33 },
	{ 0x3708, 0x63 },
	{ 0x370c, 0xc0 },
	{ 0x3800, 0x01 },
	{ 0x3801, 0x50 },
	{ 0x3802, 0x01 },
	{ 0x3803, 0xb2 },
	{ 0x3804, 0x08 },
	{ 0x3805, 0xef },
	{ 0x3806, 0x05 },
	{ 0x3807, 0xf1 },
	{ 0x3808, 0x07 },
	{ 0x3809, 0x80 },
	{ 0x380a, 0x04 },
	{ 0x380b, 0x38 },
	{ 0x380c, 0x09 },
	{ 0x380d, 0xc4 },
	{ 0x380e, 0x04 },
	{ 0x380f, 0x60 },
	{ 0x3813, 0x04 },
	{ 0x3814, 0x11 },
	{ 0x3815, 0x11 },
	{ 0x3820, 0x47 },
	{ 0x4514, 0x88 },
	{ 0x3a02, 0x04 },
	{ 0x3a03, 0x60 },
	{ 0x3a08, 0x01 },
	{ 0x3a09, 0x50 },
	{ 0x3a0a, 0x01 },
	{ 0x3a0b, 0x18 },
	{ 0x3a0e, 0x03 },
	{ 0x3a0d, 0x04 },
	{ 0x3a14, 0x04 },
	{ 0x3a15, 0x60 },
	{ 0x3a18, 0x00 },
	{ 0x4004, 0x06 },
	{ 0x4005, 0x18 },
	{ 0x4300, 0x32 },
	{ 0x4202, 0x00 },
	{ 0x4837, 0x0b }
};

static const struct reg_value ov5645_setting_full[] = {
	{ 0x3612, 0xab },
	{ 0x3614, 0x50 },
	{ 0x3618, 0x04 },
	{ 0x3034, 0x18 },
	{ 0x3035, 0x11 },
	{ 0x3036, 0x54 },
	{ 0x3600, 0x08 },
	{ 0x3601, 0x33 },
	{ 0x3708, 0x63 },
	{ 0x370c, 0xc0 },
	{ 0x3800, 0x00 },
	{ 0x3801, 0x00 },
	{ 0x3802, 0x00 },
	{ 0x3803, 0x00 },
	{ 0x3804, 0x0a },
	{ 0x3805, 0x3f },
	{ 0x3806, 0x07 },
	{ 0x3807, 0x9f },
	{ 0x3808, 0x0a },
	{ 0x3809, 0x20 },
	{ 0x380a, 0x07 },
	{ 0x380b, 0x98 },
	{ 0x380c, 0x0b },
	{ 0x380d, 0x1c },
	{ 0x380e, 0x07 },
	{ 0x380f, 0xb0 },
	{ 0x3813, 0x06 },
	{ 0x3814, 0x11 },
	{ 0x3815, 0x11 },
	{ 0x3820, 0x47 },
	{ 0x4514, 0x88 },
	{ 0x3a02, 0x07 },
	{ 0x3a03, 0xb0 },
	{ 0x3a08, 0x01 },
	{ 0x3a09, 0x27 },
	{ 0x3a0a, 0x00 },
	{ 0x3a0b, 0xf6 },
	{ 0x3a0e, 0x06 },
	{ 0x3a0d, 0x08 },
	{ 0x3a14, 0x07 },
	{ 0x3a15, 0xb0 },
	{ 0x3a18, 0x01 },
	{ 0x4004, 0x06 },
	{ 0x4005, 0x18 },
	{ 0x4300, 0x32 },
	{ 0x4837, 0x0b },
	{ 0x4202, 0x00 }
};

static const s64 link_freq[] = {
	222880000,
	334320000
};

static const struct ov5645_mode_info ov5645_mode_info_data[] = {
	{
		.width = 1280,
		.height = 960,
		.data = ov5645_setting_sxga,
		.data_size = ARRAY_SIZE(ov5645_setting_sxga),
		.pixel_clock = 111440000,
		.link_freq = 0 /* an index in link_freq[] */
	},
	{
		.width = 1920,
		.height = 1080,
		.data = ov5645_setting_1080p,
		.data_size = ARRAY_SIZE(ov5645_setting_1080p),
		.pixel_clock = 167160000,
		.link_freq = 1 /* an index in link_freq[] */
	},
	{
		.width = 2592,
		.height = 1944,
		.data = ov5645_setting_full,
		.data_size = ARRAY_SIZE(ov5645_setting_full),
		.pixel_clock = 167160000,
		.link_freq = 1 /* an index in link_freq[] */
	},
};

static int ov5645_regulators_enable(struct ov5645 *ov5645)
{
	int ret;

	ret = regulator_enable(ov5645->io_regulator);
	if (ret < 0) {
		dev_err(ov5645->dev, "set io voltage failed\n");
		return ret;
	}

	ret = regulator_enable(ov5645->analog_regulator);
	if (ret) {
		dev_err(ov5645->dev, "set analog voltage failed\n");
		goto err_disable_io;
	}

	ret = regulator_enable(ov5645->core_regulator);
	if (ret) {
		dev_err(ov5645->dev, "set core voltage failed\n");
		goto err_disable_analog;
	}

	return 0;

err_disable_analog:
	regulator_disable(ov5645->analog_regulator);
err_disable_io:
	regulator_disable(ov5645->io_regulator);

	return ret;
}

static void ov5645_regulators_disable(struct ov5645 *ov5645)
{
	int ret;

	ret = regulator_disable(ov5645->core_regulator);
	if (ret < 0)
		dev_err(ov5645->dev, "core regulator disable failed\n");

	ret = regulator_disable(ov5645->analog_regulator);
	if (ret < 0)
		dev_err(ov5645->dev, "analog regulator disable failed\n");

	ret = regulator_disable(ov5645->io_regulator);
	if (ret < 0)
		dev_err(ov5645->dev, "io regulator disable failed\n");
}

static int ov5645_write_reg(struct ov5645 *ov5645, u16 reg, u8 val)
{
	u8 regbuf[3];
	int ret;

	regbuf[0] = reg >> 8;
	regbuf[1] = reg & 0xff;
	regbuf[2] = val;

	ret = i2c_master_send(ov5645->i2c_client, regbuf, 3);
	if (ret < 0)
		dev_err(ov5645->dev, "%s: write reg error %d: reg=%x, val=%x\n",
			__func__, ret, reg, val);

	return ret;
}

static int ov5645_read_reg(struct ov5645 *ov5645, u16 reg, u8 *val)
{
	u8 regbuf[2];
	int ret;

	regbuf[0] = reg >> 8;
	regbuf[1] = reg & 0xff;

	ret = i2c_master_send(ov5645->i2c_client, regbuf, 2);
	if (ret < 0) {
		dev_err(ov5645->dev, "%s: write reg error %d: reg=%x\n",
			__func__, ret, reg);
		return ret;
	}

	ret = i2c_master_recv(ov5645->i2c_client, val, 1);
	if (ret < 0) {
		dev_err(ov5645->dev, "%s: read reg error %d: reg=%x\n",
			__func__, ret, reg);
		return ret;
	}

	return 0;
}

static int ov5645_set_aec_mode(struct ov5645 *ov5645, u32 mode)
{
	u8 val = ov5645->aec_pk_manual;
	int ret;

	if (mode == V4L2_EXPOSURE_AUTO)
		val &= ~OV5645_AEC_MANUAL_ENABLE;
	else /* V4L2_EXPOSURE_MANUAL */
		val |= OV5645_AEC_MANUAL_ENABLE;

	ret = ov5645_write_reg(ov5645, OV5645_AEC_PK_MANUAL, val);
	if (!ret)
		ov5645->aec_pk_manual = val;

	return ret;
}

static int ov5645_set_agc_mode(struct ov5645 *ov5645, u32 enable)
{
	u8 val = ov5645->aec_pk_manual;
	int ret;

	if (enable)
		val &= ~OV5645_AGC_MANUAL_ENABLE;
	else
		val |= OV5645_AGC_MANUAL_ENABLE;

	ret = ov5645_write_reg(ov5645, OV5645_AEC_PK_MANUAL, val);
	if (!ret)
		ov5645->aec_pk_manual = val;

	return ret;
}

static int ov5645_set_register_array(struct ov5645 *ov5645,
				     const struct reg_value *settings,
				     unsigned int num_settings)
{
	unsigned int i;
	int ret;

	for (i = 0; i < num_settings; ++i, ++settings) {
		ret = ov5645_write_reg(ov5645, settings->reg, settings->val);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static int ov5645_set_power_on(struct ov5645 *ov5645)
{
	int ret;

	ret = ov5645_regulators_enable(ov5645);
	if (ret < 0) {
		return ret;
	}

	ret = clk_prepare_enable(ov5645->xclk);
	if (ret < 0) {
		dev_err(ov5645->dev, "clk prepare enable failed\n");
		ov5645_regulators_disable(ov5645);
		return ret;
	}

	usleep_range(5000, 15000);
	gpiod_set_value_cansleep(ov5645->enable_gpio, 1);

	usleep_range(1000, 2000);
	gpiod_set_value_cansleep(ov5645->rst_gpio, 0);

	msleep(20);

	return 0;
}

static void ov5645_set_power_off(struct ov5645 *ov5645)
{
	gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
	gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
	clk_disable_unprepare(ov5645->xclk);
	ov5645_regulators_disable(ov5645);
}

static int ov5645_s_power(struct v4l2_subdev *sd, int on)
{
	struct ov5645 *ov5645 = to_ov5645(sd);
	int ret = 0;

	mutex_lock(&ov5645->power_lock);

	/* If the power count is modified from 0 to != 0 or from != 0 to 0,
	 * update the power state.
	 */
	if (ov5645->power_count == !on) {
		if (on) {
			ret = ov5645_set_power_on(ov5645);
			if (ret < 0)
				goto exit;

			ret = ov5645_set_register_array(ov5645,
					ov5645_global_init_setting,
					ARRAY_SIZE(ov5645_global_init_setting));
			if (ret < 0) {
				dev_err(ov5645->dev,
					"could not set init registers\n");
				ov5645_set_power_off(ov5645);
				goto exit;
			}

			ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
					       OV5645_SYSTEM_CTRL0_STOP);
			if (ret < 0) {
				ov5645_set_power_off(ov5645);
				goto exit;
			}
		} else {
			ov5645_set_power_off(ov5645);
		}
	}

	/* Update the power count. */
	ov5645->power_count += on ? 1 : -1;
	WARN_ON(ov5645->power_count < 0);

exit:
	mutex_unlock(&ov5645->power_lock);

	return ret;
}

static int ov5645_set_saturation(struct ov5645 *ov5645, s32 value)
{
	u32 reg_value = (value * 0x10) + 0x40;
	int ret;

	ret = ov5645_write_reg(ov5645, OV5645_SDE_SAT_U, reg_value);
	if (ret < 0)
		return ret;

	return ov5645_write_reg(ov5645, OV5645_SDE_SAT_V, reg_value);
}

static int ov5645_set_hflip(struct ov5645 *ov5645, s32 value)
{
	u8 val = ov5645->timing_tc_reg21;
	int ret;

	if (value == 0)
		val &= ~(OV5645_SENSOR_MIRROR);
	else
		val |= (OV5645_SENSOR_MIRROR);

	ret = ov5645_write_reg(ov5645, OV5645_TIMING_TC_REG21, val);
	if (!ret)
		ov5645->timing_tc_reg21 = val;

	return ret;
}

static int ov5645_set_vflip(struct ov5645 *ov5645, s32 value)
{
	u8 val = ov5645->timing_tc_reg20;
	int ret;

	if (value == 0)
		val |= (OV5645_SENSOR_VFLIP | OV5645_ISP_VFLIP);
	else
		val &= ~(OV5645_SENSOR_VFLIP | OV5645_ISP_VFLIP);

	ret = ov5645_write_reg(ov5645, OV5645_TIMING_TC_REG20, val);
	if (!ret)
		ov5645->timing_tc_reg20 = val;

	return ret;
}

static int ov5645_set_test_pattern(struct ov5645 *ov5645, s32 value)
{
	u8 val = 0;

	if (value) {
		val = OV5645_SET_TEST_PATTERN(value - 1);
		val |= OV5645_TEST_PATTERN_ENABLE;
	}

	return ov5645_write_reg(ov5645, OV5645_PRE_ISP_TEST_SETTING_1, val);
}

static const char * const ov5645_test_pattern_menu[] = {
	"Disabled",
	"Vertical Color Bars",
	"Pseudo-Random Data",
	"Color Square",
	"Black Image",
};

static int ov5645_set_awb(struct ov5645 *ov5645, s32 enable_auto)
{
	u8 val = 0;

	if (!enable_auto)
		val = OV5645_AWB_MANUAL_ENABLE;

	return ov5645_write_reg(ov5645, OV5645_AWB_MANUAL_CONTROL, val);
}

static int ov5645_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct ov5645 *ov5645 = container_of(ctrl->handler,
					     struct ov5645, ctrls);
	int ret;

	mutex_lock(&ov5645->power_lock);
	if (!ov5645->power_count) {
		mutex_unlock(&ov5645->power_lock);
		return 0;
	}

	switch (ctrl->id) {
	case V4L2_CID_SATURATION:
		ret = ov5645_set_saturation(ov5645, ctrl->val);
		break;
	case V4L2_CID_AUTO_WHITE_BALANCE:
		ret = ov5645_set_awb(ov5645, ctrl->val);
		break;
	case V4L2_CID_AUTOGAIN:
		ret = ov5645_set_agc_mode(ov5645, ctrl->val);
		break;
	case V4L2_CID_EXPOSURE_AUTO:
		ret = ov5645_set_aec_mode(ov5645, ctrl->val);
		break;
	case V4L2_CID_TEST_PATTERN:
		ret = ov5645_set_test_pattern(ov5645, ctrl->val);
		break;
	case V4L2_CID_HFLIP:
		ret = ov5645_set_hflip(ov5645, ctrl->val);
		break;
	case V4L2_CID_VFLIP:
		ret = ov5645_set_vflip(ov5645, ctrl->val);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	mutex_unlock(&ov5645->power_lock);

	return ret;
}

static struct v4l2_ctrl_ops ov5645_ctrl_ops = {
	.s_ctrl = ov5645_s_ctrl,
};

static int ov5645_enum_mbus_code(struct v4l2_subdev *sd,
				 struct v4l2_subdev_pad_config *cfg,
				 struct v4l2_subdev_mbus_code_enum *code)
{
	if (code->index > 0)
		return -EINVAL;

	code->code = MEDIA_BUS_FMT_UYVY8_2X8;

	return 0;
}

static int ov5645_enum_frame_size(struct v4l2_subdev *subdev,
				  struct v4l2_subdev_pad_config *cfg,
				  struct v4l2_subdev_frame_size_enum *fse)
{
	if (fse->code != MEDIA_BUS_FMT_UYVY8_2X8)
		return -EINVAL;

	if (fse->index >= ARRAY_SIZE(ov5645_mode_info_data))
		return -EINVAL;

	fse->min_width = ov5645_mode_info_data[fse->index].width;
	fse->max_width = ov5645_mode_info_data[fse->index].width;
	fse->min_height = ov5645_mode_info_data[fse->index].height;
	fse->max_height = ov5645_mode_info_data[fse->index].height;

	return 0;
}

static struct v4l2_mbus_framefmt *
__ov5645_get_pad_format(struct ov5645 *ov5645,
			struct v4l2_subdev_pad_config *cfg,
			unsigned int pad,
			enum v4l2_subdev_format_whence which)
{
	switch (which) {
	case V4L2_SUBDEV_FORMAT_TRY:
		return v4l2_subdev_get_try_format(&ov5645->sd, cfg, pad);
	case V4L2_SUBDEV_FORMAT_ACTIVE:
		return &ov5645->fmt;
	default:
		return NULL;
	}
}

static int ov5645_get_format(struct v4l2_subdev *sd,
			     struct v4l2_subdev_pad_config *cfg,
			     struct v4l2_subdev_format *format)
{
	struct ov5645 *ov5645 = to_ov5645(sd);

	format->format = *__ov5645_get_pad_format(ov5645, cfg, format->pad,
						  format->which);
	return 0;
}

static struct v4l2_rect *
__ov5645_get_pad_crop(struct ov5645 *ov5645, struct v4l2_subdev_pad_config *cfg,
		      unsigned int pad, enum v4l2_subdev_format_whence which)
{
	switch (which) {
	case V4L2_SUBDEV_FORMAT_TRY:
		return v4l2_subdev_get_try_crop(&ov5645->sd, cfg, pad);
	case V4L2_SUBDEV_FORMAT_ACTIVE:
		return &ov5645->crop;
	default:
		return NULL;
	}
}

static const struct ov5645_mode_info *
ov5645_find_nearest_mode(unsigned int width, unsigned int height)
{
	int i;

	for (i = ARRAY_SIZE(ov5645_mode_info_data) - 1; i >= 0; i--) {
		if (ov5645_mode_info_data[i].width <= width &&
		    ov5645_mode_info_data[i].height <= height)
			break;
	}

	if (i < 0)
		i = 0;

	return &ov5645_mode_info_data[i];
}

static int ov5645_set_format(struct v4l2_subdev *sd,
			     struct v4l2_subdev_pad_config *cfg,
			     struct v4l2_subdev_format *format)
{
	struct ov5645 *ov5645 = to_ov5645(sd);
	struct v4l2_mbus_framefmt *__format;
	struct v4l2_rect *__crop;
	const struct ov5645_mode_info *new_mode;
	int ret;

	__crop = __ov5645_get_pad_crop(ov5645, cfg, format->pad,
			format->which);

	new_mode = ov5645_find_nearest_mode(format->format.width,
					    format->format.height);
	__crop->width = new_mode->width;
	__crop->height = new_mode->height;

	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
		ret = v4l2_ctrl_s_ctrl_int64(ov5645->pixel_clock,
					     new_mode->pixel_clock);
		if (ret < 0)
			return ret;

		ret = v4l2_ctrl_s_ctrl(ov5645->link_freq,
				       new_mode->link_freq);
		if (ret < 0)
			return ret;

		ov5645->current_mode = new_mode;
	}

	__format = __ov5645_get_pad_format(ov5645, cfg, format->pad,
			format->which);
	__format->width = __crop->width;
	__format->height = __crop->height;
	__format->code = MEDIA_BUS_FMT_UYVY8_2X8;
	__format->field = V4L2_FIELD_NONE;
	__format->colorspace = V4L2_COLORSPACE_SRGB;

	format->format = *__format;

	return 0;
}

static int ov5645_entity_init_cfg(struct v4l2_subdev *subdev,
				  struct v4l2_subdev_pad_config *cfg)
{
	struct v4l2_subdev_format fmt = { 0 };

	fmt.which = cfg ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
	fmt.format.width = 1920;
	fmt.format.height = 1080;

	ov5645_set_format(subdev, cfg, &fmt);

	return 0;
}

static int ov5645_get_selection(struct v4l2_subdev *sd,
			   struct v4l2_subdev_pad_config *cfg,
			   struct v4l2_subdev_selection *sel)
{
	struct ov5645 *ov5645 = to_ov5645(sd);

	if (sel->target != V4L2_SEL_TGT_CROP)
		return -EINVAL;

	sel->r = *__ov5645_get_pad_crop(ov5645, cfg, sel->pad,
					sel->which);
	return 0;
}

static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
{
	struct ov5645 *ov5645 = to_ov5645(subdev);
	int ret;

	if (enable) {
		ret = ov5645_set_register_array(ov5645,
					ov5645->current_mode->data,
					ov5645->current_mode->data_size);
		if (ret < 0) {
			dev_err(ov5645->dev, "could not set mode %dx%d\n",
				ov5645->current_mode->width,
				ov5645->current_mode->height);
			return ret;
		}
		ret = v4l2_ctrl_handler_setup(&ov5645->ctrls);
		if (ret < 0) {
			dev_err(ov5645->dev, "could not sync v4l2 controls\n");
			return ret;
		}
		ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
				       OV5645_SYSTEM_CTRL0_START);
		if (ret < 0)
			return ret;
	} else {
		ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
				       OV5645_SYSTEM_CTRL0_STOP);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static const struct v4l2_subdev_core_ops ov5645_core_ops = {
	.s_power = ov5645_s_power,
};

static const struct v4l2_subdev_video_ops ov5645_video_ops = {
	.s_stream = ov5645_s_stream,
};

static const struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
	.init_cfg = ov5645_entity_init_cfg,
	.enum_mbus_code = ov5645_enum_mbus_code,
	.enum_frame_size = ov5645_enum_frame_size,
	.get_fmt = ov5645_get_format,
	.set_fmt = ov5645_set_format,
	.get_selection = ov5645_get_selection,
};

static const struct v4l2_subdev_ops ov5645_subdev_ops = {
	.core = &ov5645_core_ops,
	.video = &ov5645_video_ops,
	.pad = &ov5645_subdev_pad_ops,
};

static int ov5645_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct device_node *endpoint;
	struct ov5645 *ov5645;
	u8 chip_id_high, chip_id_low;
	u32 xclk_freq;
	int ret;

	ov5645 = devm_kzalloc(dev, sizeof(struct ov5645), GFP_KERNEL);
	if (!ov5645)
		return -ENOMEM;

	ov5645->i2c_client = client;
	ov5645->dev = dev;

	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
	if (!endpoint) {
		dev_err(dev, "endpoint node not found\n");
		return -EINVAL;
	}

	ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(endpoint),
					 &ov5645->ep);
	if (ret < 0) {
		dev_err(dev, "parsing endpoint node failed\n");
		return ret;
	}

	of_node_put(endpoint);

	if (ov5645->ep.bus_type != V4L2_MBUS_CSI2) {
		dev_err(dev, "invalid bus type, must be CSI2\n");
		return -EINVAL;
	}

	/* get system clock (xclk) */
	ov5645->xclk = devm_clk_get(dev, "xclk");
	if (IS_ERR(ov5645->xclk)) {
		dev_err(dev, "could not get xclk");
		return PTR_ERR(ov5645->xclk);
	}

	ret = of_property_read_u32(dev->of_node, "clock-frequency", &xclk_freq);
	if (ret) {
		dev_err(dev, "could not get xclk frequency\n");
		return ret;
	}

	if (xclk_freq != 23880000) {
		dev_err(dev, "external clock frequency %u is not supported\n",
			xclk_freq);
		return -EINVAL;
	}

	ret = clk_set_rate(ov5645->xclk, xclk_freq);
	if (ret) {
		dev_err(dev, "could not set xclk frequency\n");
		return ret;
	}

	ov5645->io_regulator = devm_regulator_get(dev, "vdddo");
	if (IS_ERR(ov5645->io_regulator)) {
		dev_err(dev, "cannot get io regulator\n");
		return PTR_ERR(ov5645->io_regulator);
	}

	ret = regulator_set_voltage(ov5645->io_regulator,
				    OV5645_VOLTAGE_DIGITAL_IO,
				    OV5645_VOLTAGE_DIGITAL_IO);
	if (ret < 0) {
		dev_err(dev, "cannot set io voltage\n");
		return ret;
	}

	ov5645->core_regulator = devm_regulator_get(dev, "vddd");
	if (IS_ERR(ov5645->core_regulator)) {
		dev_err(dev, "cannot get core regulator\n");
		return PTR_ERR(ov5645->core_regulator);
	}

	ret = regulator_set_voltage(ov5645->core_regulator,
				    OV5645_VOLTAGE_DIGITAL_CORE,
				    OV5645_VOLTAGE_DIGITAL_CORE);
	if (ret < 0) {
		dev_err(dev, "cannot set core voltage\n");
		return ret;
	}

	ov5645->analog_regulator = devm_regulator_get(dev, "vdda");
	if (IS_ERR(ov5645->analog_regulator)) {
		dev_err(dev, "cannot get analog regulator\n");
		return PTR_ERR(ov5645->analog_regulator);
	}

	ret = regulator_set_voltage(ov5645->analog_regulator,
				    OV5645_VOLTAGE_ANALOG,
				    OV5645_VOLTAGE_ANALOG);
	if (ret < 0) {
		dev_err(dev, "cannot set analog voltage\n");
		return ret;
	}

	ov5645->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
	if (IS_ERR(ov5645->enable_gpio)) {
		dev_err(dev, "cannot get enable gpio\n");
		return PTR_ERR(ov5645->enable_gpio);
	}

	ov5645->rst_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(ov5645->rst_gpio)) {
		dev_err(dev, "cannot get reset gpio\n");
		return PTR_ERR(ov5645->rst_gpio);
	}

	mutex_init(&ov5645->power_lock);

	v4l2_ctrl_handler_init(&ov5645->ctrls, 9);
	v4l2_ctrl_new_std(&ov5645->ctrls, &ov5645_ctrl_ops,
			  V4L2_CID_SATURATION, -4, 4, 1, 0);
	v4l2_ctrl_new_std(&ov5645->ctrls, &ov5645_ctrl_ops,
			  V4L2_CID_HFLIP, 0, 1, 1, 0);
	v4l2_ctrl_new_std(&ov5645->ctrls, &ov5645_ctrl_ops,
			  V4L2_CID_VFLIP, 0, 1, 1, 0);
	v4l2_ctrl_new_std(&ov5645->ctrls, &ov5645_ctrl_ops,
			  V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
	v4l2_ctrl_new_std(&ov5645->ctrls, &ov5645_ctrl_ops,
			  V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 1);
	v4l2_ctrl_new_std_menu(&ov5645->ctrls, &ov5645_ctrl_ops,
			       V4L2_CID_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL,
			       0, V4L2_EXPOSURE_AUTO);
	v4l2_ctrl_new_std_menu_items(&ov5645->ctrls, &ov5645_ctrl_ops,
				     V4L2_CID_TEST_PATTERN,
				     ARRAY_SIZE(ov5645_test_pattern_menu) - 1,
				     0, 0, ov5645_test_pattern_menu);
	ov5645->pixel_clock = v4l2_ctrl_new_std(&ov5645->ctrls,
						&ov5645_ctrl_ops,
						V4L2_CID_PIXEL_RATE,
						1, INT_MAX, 1, 1);
	ov5645->link_freq = v4l2_ctrl_new_int_menu(&ov5645->ctrls,
						   &ov5645_ctrl_ops,
						   V4L2_CID_LINK_FREQ,
						   ARRAY_SIZE(link_freq) - 1,
						   0, link_freq);
	if (ov5645->link_freq)
		ov5645->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	ov5645->sd.ctrl_handler = &ov5645->ctrls;

	if (ov5645->ctrls.error) {
		dev_err(dev, "%s: control initialization error %d\n",
		       __func__, ov5645->ctrls.error);
		ret = ov5645->ctrls.error;
		goto free_ctrl;
	}

	v4l2_i2c_subdev_init(&ov5645->sd, client, &ov5645_subdev_ops);
	ov5645->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	ov5645->pad.flags = MEDIA_PAD_FL_SOURCE;
	ov5645->sd.dev = &client->dev;
	ov5645->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;

	ret = media_entity_pads_init(&ov5645->sd.entity, 1, &ov5645->pad);
	if (ret < 0) {
		dev_err(dev, "could not register media entity\n");
		goto free_ctrl;
	}

	ret = ov5645_s_power(&ov5645->sd, true);
	if (ret < 0) {
		dev_err(dev, "could not power up OV5645\n");
		goto free_entity;
	}

	ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_HIGH, &chip_id_high);
	if (ret < 0 || chip_id_high != OV5645_CHIP_ID_HIGH_BYTE) {
		dev_err(dev, "could not read ID high\n");
		ret = -ENODEV;
		goto power_down;
	}
	ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_LOW, &chip_id_low);
	if (ret < 0 || chip_id_low != OV5645_CHIP_ID_LOW_BYTE) {
		dev_err(dev, "could not read ID low\n");
		ret = -ENODEV;
		goto power_down;
	}

	dev_info(dev, "OV5645 detected at address 0x%02x\n", client->addr);

	ret = ov5645_read_reg(ov5645, OV5645_AEC_PK_MANUAL,
			      &ov5645->aec_pk_manual);
	if (ret < 0) {
		dev_err(dev, "could not read AEC/AGC mode\n");
		ret = -ENODEV;
		goto power_down;
	}

	ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG20,
			      &ov5645->timing_tc_reg20);
	if (ret < 0) {
		dev_err(dev, "could not read vflip value\n");
		ret = -ENODEV;
		goto power_down;
	}

	ret = ov5645_read_reg(ov5645, OV5645_TIMING_TC_REG21,
			      &ov5645->timing_tc_reg21);
	if (ret < 0) {
		dev_err(dev, "could not read hflip value\n");
		ret = -ENODEV;
		goto power_down;
	}

	ov5645_s_power(&ov5645->sd, false);

	ret = v4l2_async_register_subdev(&ov5645->sd);
	if (ret < 0) {
		dev_err(dev, "could not register v4l2 device\n");
		goto free_entity;
	}

	ov5645_entity_init_cfg(&ov5645->sd, NULL);

	return 0;

power_down:
	ov5645_s_power(&ov5645->sd, false);
free_entity:
	media_entity_cleanup(&ov5645->sd.entity);
free_ctrl:
	v4l2_ctrl_handler_free(&ov5645->ctrls);
	mutex_destroy(&ov5645->power_lock);

	return ret;
}

static int ov5645_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov5645 *ov5645 = to_ov5645(sd);

	v4l2_async_unregister_subdev(&ov5645->sd);
	media_entity_cleanup(&ov5645->sd.entity);
	v4l2_ctrl_handler_free(&ov5645->ctrls);
	mutex_destroy(&ov5645->power_lock);

	return 0;
}

static const struct i2c_device_id ov5645_id[] = {
	{ "ov5645", 0 },
	{}
};
MODULE_DEVICE_TABLE(i2c, ov5645_id);

static const struct of_device_id ov5645_of_match[] = {
	{ .compatible = "ovti,ov5645" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ov5645_of_match);

static struct i2c_driver ov5645_i2c_driver = {
	.driver = {
		.of_match_table = of_match_ptr(ov5645_of_match),
		.name  = "ov5645",
	},
	.probe  = ov5645_probe,
	.remove = ov5645_remove,
	.id_table = ov5645_id,
};

module_i2c_driver(ov5645_i2c_driver);

MODULE_DESCRIPTION("Omnivision OV5645 Camera Driver");
MODULE_AUTHOR("Todor Tomov <todor.tomov@linaro.org>");
MODULE_LICENSE("GPL v2");