Linux preempt-rt

Check our new training course

Real-Time Linux with PREEMPT_RT

Check our new training course
with Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

   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
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
// SPDX-License-Identifier: GPL-2.0
/*
 * A V4L2 driver for Sony IMX219 cameras.
 * Copyright (C) 2019, Raspberry Pi (Trading) Ltd
 *
 * Based on Sony imx258 camera driver
 * Copyright (C) 2018 Intel Corporation
 *
 * DT / fwnode changes, and regulator / GPIO control taken from imx214 driver
 * Copyright 2018 Qtechnology A/S
 *
 * Flip handling taken from the Sony IMX319 driver.
 * Copyright (C) 2018 Intel Corporation
 *
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-mediabus.h>
#include <asm/unaligned.h>

#define IMX219_REG_VALUE_08BIT		1
#define IMX219_REG_VALUE_16BIT		2

#define IMX219_REG_MODE_SELECT		0x0100
#define IMX219_MODE_STANDBY		0x00
#define IMX219_MODE_STREAMING		0x01

/* Chip ID */
#define IMX219_REG_CHIP_ID		0x0000
#define IMX219_CHIP_ID			0x0219

/* External clock frequency is 24.0M */
#define IMX219_XCLK_FREQ		24000000

/* Pixel rate is fixed at 182.4M for all the modes */
#define IMX219_PIXEL_RATE		182400000

#define IMX219_DEFAULT_LINK_FREQ	456000000

/* V_TIMING internal */
#define IMX219_REG_VTS			0x0160
#define IMX219_VTS_15FPS		0x0dc6
#define IMX219_VTS_30FPS_1080P		0x06e3
#define IMX219_VTS_30FPS_BINNED		0x06e3
#define IMX219_VTS_30FPS_640x480	0x06e3
#define IMX219_VTS_MAX			0xffff

#define IMX219_VBLANK_MIN		4

/*Frame Length Line*/
#define IMX219_FLL_MIN			0x08a6
#define IMX219_FLL_MAX			0xffff
#define IMX219_FLL_STEP			1
#define IMX219_FLL_DEFAULT		0x0c98

/* HBLANK control - read only */
#define IMX219_PPL_DEFAULT		3448

/* Exposure control */
#define IMX219_REG_EXPOSURE		0x015a
#define IMX219_EXPOSURE_MIN		4
#define IMX219_EXPOSURE_STEP		1
#define IMX219_EXPOSURE_DEFAULT		0x640
#define IMX219_EXPOSURE_MAX		65535

/* Analog gain control */
#define IMX219_REG_ANALOG_GAIN		0x0157
#define IMX219_ANA_GAIN_MIN		0
#define IMX219_ANA_GAIN_MAX		232
#define IMX219_ANA_GAIN_STEP		1
#define IMX219_ANA_GAIN_DEFAULT		0x0

/* Digital gain control */
#define IMX219_REG_DIGITAL_GAIN		0x0158
#define IMX219_DGTL_GAIN_MIN		0x0100
#define IMX219_DGTL_GAIN_MAX		0x0fff
#define IMX219_DGTL_GAIN_DEFAULT	0x0100
#define IMX219_DGTL_GAIN_STEP		1

#define IMX219_REG_ORIENTATION		0x0172

/* Test Pattern Control */
#define IMX219_REG_TEST_PATTERN		0x0600
#define IMX219_TEST_PATTERN_DISABLE	0
#define IMX219_TEST_PATTERN_SOLID_COLOR	1
#define IMX219_TEST_PATTERN_COLOR_BARS	2
#define IMX219_TEST_PATTERN_GREY_COLOR	3
#define IMX219_TEST_PATTERN_PN9		4

/* Test pattern colour components */
#define IMX219_REG_TESTP_RED		0x0602
#define IMX219_REG_TESTP_GREENR		0x0604
#define IMX219_REG_TESTP_BLUE		0x0606
#define IMX219_REG_TESTP_GREENB		0x0608
#define IMX219_TESTP_COLOUR_MIN		0
#define IMX219_TESTP_COLOUR_MAX		0x03ff
#define IMX219_TESTP_COLOUR_STEP	1
#define IMX219_TESTP_RED_DEFAULT	IMX219_TESTP_COLOUR_MAX
#define IMX219_TESTP_GREENR_DEFAULT	0
#define IMX219_TESTP_BLUE_DEFAULT	0
#define IMX219_TESTP_GREENB_DEFAULT	0

/* IMX219 native and active pixel array size. */
#define IMX219_NATIVE_WIDTH		3296U
#define IMX219_NATIVE_HEIGHT		2480U
#define IMX219_PIXEL_ARRAY_LEFT		8U
#define IMX219_PIXEL_ARRAY_TOP		8U
#define IMX219_PIXEL_ARRAY_WIDTH	3280U
#define IMX219_PIXEL_ARRAY_HEIGHT	2464U

struct imx219_reg {
	u16 address;
	u8 val;
};

struct imx219_reg_list {
	unsigned int num_of_regs;
	const struct imx219_reg *regs;
};

/* Mode : resolution and related config&values */
struct imx219_mode {
	/* Frame width */
	unsigned int width;
	/* Frame height */
	unsigned int height;

	/* Analog crop rectangle. */
	struct v4l2_rect crop;

	/* V-timing */
	unsigned int vts_def;

	/* Default register values */
	struct imx219_reg_list reg_list;
};

/*
 * Register sets lifted off the i2C interface from the Raspberry Pi firmware
 * driver.
 * 3280x2464 = mode 2, 1920x1080 = mode 1, 1640x1232 = mode 4, 640x480 = mode 7.
 */
static const struct imx219_reg mode_3280x2464_regs[] = {
	{0x0100, 0x00},
	{0x30eb, 0x0c},
	{0x30eb, 0x05},
	{0x300a, 0xff},
	{0x300b, 0xff},
	{0x30eb, 0x05},
	{0x30eb, 0x09},
	{0x0114, 0x01},
	{0x0128, 0x00},
	{0x012a, 0x18},
	{0x012b, 0x00},
	{0x0164, 0x00},
	{0x0165, 0x00},
	{0x0166, 0x0c},
	{0x0167, 0xcf},
	{0x0168, 0x00},
	{0x0169, 0x00},
	{0x016a, 0x09},
	{0x016b, 0x9f},
	{0x016c, 0x0c},
	{0x016d, 0xd0},
	{0x016e, 0x09},
	{0x016f, 0xa0},
	{0x0170, 0x01},
	{0x0171, 0x01},
	{0x0174, 0x00},
	{0x0175, 0x00},
	{0x0301, 0x05},
	{0x0303, 0x01},
	{0x0304, 0x03},
	{0x0305, 0x03},
	{0x0306, 0x00},
	{0x0307, 0x39},
	{0x030b, 0x01},
	{0x030c, 0x00},
	{0x030d, 0x72},
	{0x0624, 0x0c},
	{0x0625, 0xd0},
	{0x0626, 0x09},
	{0x0627, 0xa0},
	{0x455e, 0x00},
	{0x471e, 0x4b},
	{0x4767, 0x0f},
	{0x4750, 0x14},
	{0x4540, 0x00},
	{0x47b4, 0x14},
	{0x4713, 0x30},
	{0x478b, 0x10},
	{0x478f, 0x10},
	{0x4793, 0x10},
	{0x4797, 0x0e},
	{0x479b, 0x0e},
	{0x0162, 0x0d},
	{0x0163, 0x78},
};

static const struct imx219_reg mode_1920_1080_regs[] = {
	{0x0100, 0x00},
	{0x30eb, 0x05},
	{0x30eb, 0x0c},
	{0x300a, 0xff},
	{0x300b, 0xff},
	{0x30eb, 0x05},
	{0x30eb, 0x09},
	{0x0114, 0x01},
	{0x0128, 0x00},
	{0x012a, 0x18},
	{0x012b, 0x00},
	{0x0162, 0x0d},
	{0x0163, 0x78},
	{0x0164, 0x02},
	{0x0165, 0xa8},
	{0x0166, 0x0a},
	{0x0167, 0x27},
	{0x0168, 0x02},
	{0x0169, 0xb4},
	{0x016a, 0x06},
	{0x016b, 0xeb},
	{0x016c, 0x07},
	{0x016d, 0x80},
	{0x016e, 0x04},
	{0x016f, 0x38},
	{0x0170, 0x01},
	{0x0171, 0x01},
	{0x0174, 0x00},
	{0x0175, 0x00},
	{0x0301, 0x05},
	{0x0303, 0x01},
	{0x0304, 0x03},
	{0x0305, 0x03},
	{0x0306, 0x00},
	{0x0307, 0x39},
	{0x030b, 0x01},
	{0x030c, 0x00},
	{0x030d, 0x72},
	{0x0624, 0x07},
	{0x0625, 0x80},
	{0x0626, 0x04},
	{0x0627, 0x38},
	{0x455e, 0x00},
	{0x471e, 0x4b},
	{0x4767, 0x0f},
	{0x4750, 0x14},
	{0x4540, 0x00},
	{0x47b4, 0x14},
	{0x4713, 0x30},
	{0x478b, 0x10},
	{0x478f, 0x10},
	{0x4793, 0x10},
	{0x4797, 0x0e},
	{0x479b, 0x0e},
	{0x0162, 0x0d},
	{0x0163, 0x78},
};

static const struct imx219_reg mode_1640_1232_regs[] = {
	{0x0100, 0x00},
	{0x30eb, 0x0c},
	{0x30eb, 0x05},
	{0x300a, 0xff},
	{0x300b, 0xff},
	{0x30eb, 0x05},
	{0x30eb, 0x09},
	{0x0114, 0x01},
	{0x0128, 0x00},
	{0x012a, 0x18},
	{0x012b, 0x00},
	{0x0164, 0x00},
	{0x0165, 0x00},
	{0x0166, 0x0c},
	{0x0167, 0xcf},
	{0x0168, 0x00},
	{0x0169, 0x00},
	{0x016a, 0x09},
	{0x016b, 0x9f},
	{0x016c, 0x06},
	{0x016d, 0x68},
	{0x016e, 0x04},
	{0x016f, 0xd0},
	{0x0170, 0x01},
	{0x0171, 0x01},
	{0x0174, 0x01},
	{0x0175, 0x01},
	{0x0301, 0x05},
	{0x0303, 0x01},
	{0x0304, 0x03},
	{0x0305, 0x03},
	{0x0306, 0x00},
	{0x0307, 0x39},
	{0x030b, 0x01},
	{0x030c, 0x00},
	{0x030d, 0x72},
	{0x0624, 0x06},
	{0x0625, 0x68},
	{0x0626, 0x04},
	{0x0627, 0xd0},
	{0x455e, 0x00},
	{0x471e, 0x4b},
	{0x4767, 0x0f},
	{0x4750, 0x14},
	{0x4540, 0x00},
	{0x47b4, 0x14},
	{0x4713, 0x30},
	{0x478b, 0x10},
	{0x478f, 0x10},
	{0x4793, 0x10},
	{0x4797, 0x0e},
	{0x479b, 0x0e},
	{0x0162, 0x0d},
	{0x0163, 0x78},
};

static const struct imx219_reg mode_640_480_regs[] = {
	{0x0100, 0x00},
	{0x30eb, 0x05},
	{0x30eb, 0x0c},
	{0x300a, 0xff},
	{0x300b, 0xff},
	{0x30eb, 0x05},
	{0x30eb, 0x09},
	{0x0114, 0x01},
	{0x0128, 0x00},
	{0x012a, 0x18},
	{0x012b, 0x00},
	{0x0162, 0x0d},
	{0x0163, 0x78},
	{0x0164, 0x03},
	{0x0165, 0xe8},
	{0x0166, 0x08},
	{0x0167, 0xe7},
	{0x0168, 0x02},
	{0x0169, 0xf0},
	{0x016a, 0x06},
	{0x016b, 0xaf},
	{0x016c, 0x02},
	{0x016d, 0x80},
	{0x016e, 0x01},
	{0x016f, 0xe0},
	{0x0170, 0x01},
	{0x0171, 0x01},
	{0x0174, 0x03},
	{0x0175, 0x03},
	{0x0301, 0x05},
	{0x0303, 0x01},
	{0x0304, 0x03},
	{0x0305, 0x03},
	{0x0306, 0x00},
	{0x0307, 0x39},
	{0x030b, 0x01},
	{0x030c, 0x00},
	{0x030d, 0x72},
	{0x0624, 0x06},
	{0x0625, 0x68},
	{0x0626, 0x04},
	{0x0627, 0xd0},
	{0x455e, 0x00},
	{0x471e, 0x4b},
	{0x4767, 0x0f},
	{0x4750, 0x14},
	{0x4540, 0x00},
	{0x47b4, 0x14},
	{0x4713, 0x30},
	{0x478b, 0x10},
	{0x478f, 0x10},
	{0x4793, 0x10},
	{0x4797, 0x0e},
	{0x479b, 0x0e},
};

static const struct imx219_reg raw8_framefmt_regs[] = {
	{0x018c, 0x08},
	{0x018d, 0x08},
	{0x0309, 0x08},
};

static const struct imx219_reg raw10_framefmt_regs[] = {
	{0x018c, 0x0a},
	{0x018d, 0x0a},
	{0x0309, 0x0a},
};

static const char * const imx219_test_pattern_menu[] = {
	"Disabled",
	"Color Bars",
	"Solid Color",
	"Grey Color Bars",
	"PN9"
};

static const int imx219_test_pattern_val[] = {
	IMX219_TEST_PATTERN_DISABLE,
	IMX219_TEST_PATTERN_COLOR_BARS,
	IMX219_TEST_PATTERN_SOLID_COLOR,
	IMX219_TEST_PATTERN_GREY_COLOR,
	IMX219_TEST_PATTERN_PN9,
};

/* regulator supplies */
static const char * const imx219_supply_name[] = {
	/* Supplies can be enabled in any order */
	"VANA",  /* Analog (2.8V) supply */
	"VDIG",  /* Digital Core (1.8V) supply */
	"VDDL",  /* IF (1.2V) supply */
};

#define IMX219_NUM_SUPPLIES ARRAY_SIZE(imx219_supply_name)

/*
 * The supported formats.
 * This table MUST contain 4 entries per format, to cover the various flip
 * combinations in the order
 * - no flip
 * - h flip
 * - v flip
 * - h&v flips
 */
static const u32 codes[] = {
	MEDIA_BUS_FMT_SRGGB10_1X10,
	MEDIA_BUS_FMT_SGRBG10_1X10,
	MEDIA_BUS_FMT_SGBRG10_1X10,
	MEDIA_BUS_FMT_SBGGR10_1X10,

	MEDIA_BUS_FMT_SRGGB8_1X8,
	MEDIA_BUS_FMT_SGRBG8_1X8,
	MEDIA_BUS_FMT_SGBRG8_1X8,
	MEDIA_BUS_FMT_SBGGR8_1X8,
};

/*
 * Initialisation delay between XCLR low->high and the moment when the sensor
 * can start capture (i.e. can leave software stanby) must be not less than:
 *   t4 + max(t5, t6 + <time to initialize the sensor register over I2C>)
 * where
 *   t4 is fixed, and is max 200uS,
 *   t5 is fixed, and is 6000uS,
 *   t6 depends on the sensor external clock, and is max 32000 clock periods.
 * As per sensor datasheet, the external clock must be from 6MHz to 27MHz.
 * So for any acceptable external clock t6 is always within the range of
 * 1185 to 5333 uS, and is always less than t5.
 * For this reason this is always safe to wait (t4 + t5) = 6200 uS, then
 * initialize the sensor over I2C, and then exit the software standby.
 *
 * This start-up time can be optimized a bit more, if we start the writes
 * over I2C after (t4+t6), but before (t4+t5) expires. But then sensor
 * initialization over I2C may complete before (t4+t5) expires, and we must
 * ensure that capture is not started before (t4+t5).
 *
 * This delay doesn't account for the power supply startup time. If needed,
 * this should be taken care of via the regulator framework. E.g. in the
 * case of DT for regulator-fixed one should define the startup-delay-us
 * property.
 */
#define IMX219_XCLR_MIN_DELAY_US	6200
#define IMX219_XCLR_DELAY_RANGE_US	1000

/* Mode configs */
static const struct imx219_mode supported_modes[] = {
	{
		/* 8MPix 15fps mode */
		.width = 3280,
		.height = 2464,
		.crop = {
			.left = IMX219_PIXEL_ARRAY_LEFT,
			.top = IMX219_PIXEL_ARRAY_TOP,
			.width = 3280,
			.height = 2464
		},
		.vts_def = IMX219_VTS_15FPS,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mode_3280x2464_regs),
			.regs = mode_3280x2464_regs,
		},
	},
	{
		/* 1080P 30fps cropped */
		.width = 1920,
		.height = 1080,
		.crop = {
			.left = 688,
			.top = 700,
			.width = 1920,
			.height = 1080
		},
		.vts_def = IMX219_VTS_30FPS_1080P,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mode_1920_1080_regs),
			.regs = mode_1920_1080_regs,
		},
	},
	{
		/* 2x2 binned 30fps mode */
		.width = 1640,
		.height = 1232,
		.crop = {
			.left = IMX219_PIXEL_ARRAY_LEFT,
			.top = IMX219_PIXEL_ARRAY_TOP,
			.width = 3280,
			.height = 2464
		},
		.vts_def = IMX219_VTS_30FPS_BINNED,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mode_1640_1232_regs),
			.regs = mode_1640_1232_regs,
		},
	},
	{
		/* 640x480 30fps mode */
		.width = 640,
		.height = 480,
		.crop = {
			.left = 1008,
			.top = 760,
			.width = 1280,
			.height = 960
		},
		.vts_def = IMX219_VTS_30FPS_640x480,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mode_640_480_regs),
			.regs = mode_640_480_regs,
		},
	},
};

struct imx219 {
	struct v4l2_subdev sd;
	struct media_pad pad;

	struct v4l2_mbus_framefmt fmt;

	struct clk *xclk; /* system clock to IMX219 */
	u32 xclk_freq;

	struct gpio_desc *reset_gpio;
	struct regulator_bulk_data supplies[IMX219_NUM_SUPPLIES];

	struct v4l2_ctrl_handler ctrl_handler;
	/* V4L2 Controls */
	struct v4l2_ctrl *pixel_rate;
	struct v4l2_ctrl *exposure;
	struct v4l2_ctrl *vflip;
	struct v4l2_ctrl *hflip;
	struct v4l2_ctrl *vblank;
	struct v4l2_ctrl *hblank;

	/* Current mode */
	const struct imx219_mode *mode;

	/*
	 * Mutex for serialized access:
	 * Protect sensor module set pad format and start/stop streaming safely.
	 */
	struct mutex mutex;

	/* Streaming on/off */
	bool streaming;
};

static inline struct imx219 *to_imx219(struct v4l2_subdev *_sd)
{
	return container_of(_sd, struct imx219, sd);
}

/* Read registers up to 2 at a time */
static int imx219_read_reg(struct imx219 *imx219, u16 reg, u32 len, u32 *val)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd);
	struct i2c_msg msgs[2];
	u8 addr_buf[2] = { reg >> 8, reg & 0xff };
	u8 data_buf[4] = { 0, };
	int ret;

	if (len > 4)
		return -EINVAL;

	/* Write register address */
	msgs[0].addr = client->addr;
	msgs[0].flags = 0;
	msgs[0].len = ARRAY_SIZE(addr_buf);
	msgs[0].buf = addr_buf;

	/* Read data from register */
	msgs[1].addr = client->addr;
	msgs[1].flags = I2C_M_RD;
	msgs[1].len = len;
	msgs[1].buf = &data_buf[4 - len];

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

	*val = get_unaligned_be32(data_buf);

	return 0;
}

/* Write registers up to 2 at a time */
static int imx219_write_reg(struct imx219 *imx219, u16 reg, u32 len, u32 val)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd);
	u8 buf[6];

	if (len > 4)
		return -EINVAL;

	put_unaligned_be16(reg, buf);
	put_unaligned_be32(val << (8 * (4 - len)), buf + 2);
	if (i2c_master_send(client, buf, len + 2) != len + 2)
		return -EIO;

	return 0;
}

/* Write a list of registers */
static int imx219_write_regs(struct imx219 *imx219,
			     const struct imx219_reg *regs, u32 len)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd);
	unsigned int i;
	int ret;

	for (i = 0; i < len; i++) {
		ret = imx219_write_reg(imx219, regs[i].address, 1, regs[i].val);
		if (ret) {
			dev_err_ratelimited(&client->dev,
					    "Failed to write reg 0x%4.4x. error = %d\n",
					    regs[i].address, ret);

			return ret;
		}
	}

	return 0;
}

/* Get bayer order based on flip setting. */
static u32 imx219_get_format_code(struct imx219 *imx219, u32 code)
{
	unsigned int i;

	lockdep_assert_held(&imx219->mutex);

	for (i = 0; i < ARRAY_SIZE(codes); i++)
		if (codes[i] == code)
			break;

	if (i >= ARRAY_SIZE(codes))
		i = 0;

	i = (i & ~3) | (imx219->vflip->val ? 2 : 0) |
	    (imx219->hflip->val ? 1 : 0);

	return codes[i];
}

static void imx219_set_default_format(struct imx219 *imx219)
{
	struct v4l2_mbus_framefmt *fmt;

	fmt = &imx219->fmt;
	fmt->code = MEDIA_BUS_FMT_SRGGB10_1X10;
	fmt->colorspace = V4L2_COLORSPACE_SRGB;
	fmt->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(fmt->colorspace);
	fmt->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true,
							  fmt->colorspace,
							  fmt->ycbcr_enc);
	fmt->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(fmt->colorspace);
	fmt->width = supported_modes[0].width;
	fmt->height = supported_modes[0].height;
	fmt->field = V4L2_FIELD_NONE;
}

static int imx219_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	struct imx219 *imx219 = to_imx219(sd);
	struct v4l2_mbus_framefmt *try_fmt =
		v4l2_subdev_get_try_format(sd, fh->pad, 0);
	struct v4l2_rect *try_crop;

	mutex_lock(&imx219->mutex);

	/* Initialize try_fmt */
	try_fmt->width = supported_modes[0].width;
	try_fmt->height = supported_modes[0].height;
	try_fmt->code = imx219_get_format_code(imx219,
					       MEDIA_BUS_FMT_SRGGB10_1X10);
	try_fmt->field = V4L2_FIELD_NONE;

	/* Initialize try_crop rectangle. */
	try_crop = v4l2_subdev_get_try_crop(sd, fh->pad, 0);
	try_crop->top = IMX219_PIXEL_ARRAY_TOP;
	try_crop->left = IMX219_PIXEL_ARRAY_LEFT;
	try_crop->width = IMX219_PIXEL_ARRAY_WIDTH;
	try_crop->height = IMX219_PIXEL_ARRAY_HEIGHT;

	mutex_unlock(&imx219->mutex);

	return 0;
}

static int imx219_set_ctrl(struct v4l2_ctrl *ctrl)
{
	struct imx219 *imx219 =
		container_of(ctrl->handler, struct imx219, ctrl_handler);
	struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd);
	int ret;

	if (ctrl->id == V4L2_CID_VBLANK) {
		int exposure_max, exposure_def;

		/* Update max exposure while meeting expected vblanking */
		exposure_max = imx219->mode->height + ctrl->val - 4;
		exposure_def = (exposure_max < IMX219_EXPOSURE_DEFAULT) ?
			exposure_max : IMX219_EXPOSURE_DEFAULT;
		__v4l2_ctrl_modify_range(imx219->exposure,
					 imx219->exposure->minimum,
					 exposure_max, imx219->exposure->step,
					 exposure_def);
	}

	/*
	 * Applying V4L2 control value only happens
	 * when power is up for streaming
	 */
	if (pm_runtime_get_if_in_use(&client->dev) == 0)
		return 0;

	switch (ctrl->id) {
	case V4L2_CID_ANALOGUE_GAIN:
		ret = imx219_write_reg(imx219, IMX219_REG_ANALOG_GAIN,
				       IMX219_REG_VALUE_08BIT, ctrl->val);
		break;
	case V4L2_CID_EXPOSURE:
		ret = imx219_write_reg(imx219, IMX219_REG_EXPOSURE,
				       IMX219_REG_VALUE_16BIT, ctrl->val);
		break;
	case V4L2_CID_DIGITAL_GAIN:
		ret = imx219_write_reg(imx219, IMX219_REG_DIGITAL_GAIN,
				       IMX219_REG_VALUE_16BIT, ctrl->val);
		break;
	case V4L2_CID_TEST_PATTERN:
		ret = imx219_write_reg(imx219, IMX219_REG_TEST_PATTERN,
				       IMX219_REG_VALUE_16BIT,
				       imx219_test_pattern_val[ctrl->val]);
		break;
	case V4L2_CID_HFLIP:
	case V4L2_CID_VFLIP:
		ret = imx219_write_reg(imx219, IMX219_REG_ORIENTATION, 1,
				       imx219->hflip->val |
				       imx219->vflip->val << 1);
		break;
	case V4L2_CID_VBLANK:
		ret = imx219_write_reg(imx219, IMX219_REG_VTS,
				       IMX219_REG_VALUE_16BIT,
				       imx219->mode->height + ctrl->val);
		break;
	case V4L2_CID_TEST_PATTERN_RED:
		ret = imx219_write_reg(imx219, IMX219_REG_TESTP_RED,
				       IMX219_REG_VALUE_16BIT, ctrl->val);
		break;
	case V4L2_CID_TEST_PATTERN_GREENR:
		ret = imx219_write_reg(imx219, IMX219_REG_TESTP_GREENR,
				       IMX219_REG_VALUE_16BIT, ctrl->val);
		break;
	case V4L2_CID_TEST_PATTERN_BLUE:
		ret = imx219_write_reg(imx219, IMX219_REG_TESTP_BLUE,
				       IMX219_REG_VALUE_16BIT, ctrl->val);
		break;
	case V4L2_CID_TEST_PATTERN_GREENB:
		ret = imx219_write_reg(imx219, IMX219_REG_TESTP_GREENB,
				       IMX219_REG_VALUE_16BIT, ctrl->val);
		break;
	default:
		dev_info(&client->dev,
			 "ctrl(id:0x%x,val:0x%x) is not handled\n",
			 ctrl->id, ctrl->val);
		ret = -EINVAL;
		break;
	}

	pm_runtime_put(&client->dev);

	return ret;
}

static const struct v4l2_ctrl_ops imx219_ctrl_ops = {
	.s_ctrl = imx219_set_ctrl,
};

static int imx219_enum_mbus_code(struct v4l2_subdev *sd,
				 struct v4l2_subdev_pad_config *cfg,
				 struct v4l2_subdev_mbus_code_enum *code)
{
	struct imx219 *imx219 = to_imx219(sd);

	if (code->index >= (ARRAY_SIZE(codes) / 4))
		return -EINVAL;

	code->code = imx219_get_format_code(imx219, codes[code->index * 4]);

	return 0;
}

static int imx219_enum_frame_size(struct v4l2_subdev *sd,
				  struct v4l2_subdev_pad_config *cfg,
				  struct v4l2_subdev_frame_size_enum *fse)
{
	struct imx219 *imx219 = to_imx219(sd);

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

	if (fse->code != imx219_get_format_code(imx219, fse->code))
		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 void imx219_reset_colorspace(struct v4l2_mbus_framefmt *fmt)
{
	fmt->colorspace = V4L2_COLORSPACE_SRGB;
	fmt->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(fmt->colorspace);
	fmt->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true,
							  fmt->colorspace,
							  fmt->ycbcr_enc);
	fmt->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(fmt->colorspace);
}

static void imx219_update_pad_format(struct imx219 *imx219,
				     const struct imx219_mode *mode,
				     struct v4l2_subdev_format *fmt)
{
	fmt->format.width = mode->width;
	fmt->format.height = mode->height;
	fmt->format.field = V4L2_FIELD_NONE;
	imx219_reset_colorspace(&fmt->format);
}

static int __imx219_get_pad_format(struct imx219 *imx219,
				   struct v4l2_subdev_pad_config *cfg,
				   struct v4l2_subdev_format *fmt)
{
	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		struct v4l2_mbus_framefmt *try_fmt =
			v4l2_subdev_get_try_format(&imx219->sd, cfg, fmt->pad);
		/* update the code which could change due to vflip or hflip: */
		try_fmt->code = imx219_get_format_code(imx219, try_fmt->code);
		fmt->format = *try_fmt;
	} else {
		imx219_update_pad_format(imx219, imx219->mode, fmt);
		fmt->format.code = imx219_get_format_code(imx219,
							  imx219->fmt.code);
	}

	return 0;
}

static int imx219_get_pad_format(struct v4l2_subdev *sd,
				 struct v4l2_subdev_pad_config *cfg,
				 struct v4l2_subdev_format *fmt)
{
	struct imx219 *imx219 = to_imx219(sd);
	int ret;

	mutex_lock(&imx219->mutex);
	ret = __imx219_get_pad_format(imx219, cfg, fmt);
	mutex_unlock(&imx219->mutex);

	return ret;
}

static int imx219_set_pad_format(struct v4l2_subdev *sd,
				 struct v4l2_subdev_pad_config *cfg,
				 struct v4l2_subdev_format *fmt)
{
	struct imx219 *imx219 = to_imx219(sd);
	const struct imx219_mode *mode;
	struct v4l2_mbus_framefmt *framefmt;
	int exposure_max, exposure_def, hblank;
	unsigned int i;

	mutex_lock(&imx219->mutex);

	for (i = 0; i < ARRAY_SIZE(codes); i++)
		if (codes[i] == fmt->format.code)
			break;
	if (i >= ARRAY_SIZE(codes))
		i = 0;

	/* Bayer order varies with flips */
	fmt->format.code = imx219_get_format_code(imx219, codes[i]);

	mode = v4l2_find_nearest_size(supported_modes,
				      ARRAY_SIZE(supported_modes),
				      width, height,
				      fmt->format.width, fmt->format.height);
	imx219_update_pad_format(imx219, mode, fmt);
	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		framefmt = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
		*framefmt = fmt->format;
	} else if (imx219->mode != mode ||
		   imx219->fmt.code != fmt->format.code) {
		imx219->fmt = fmt->format;
		imx219->mode = mode;
		/* Update limits and set FPS to default */
		__v4l2_ctrl_modify_range(imx219->vblank, IMX219_VBLANK_MIN,
					 IMX219_VTS_MAX - mode->height, 1,
					 mode->vts_def - mode->height);
		__v4l2_ctrl_s_ctrl(imx219->vblank,
				   mode->vts_def - mode->height);
		/* Update max exposure while meeting expected vblanking */
		exposure_max = mode->vts_def - 4;
		exposure_def = (exposure_max < IMX219_EXPOSURE_DEFAULT) ?
			exposure_max : IMX219_EXPOSURE_DEFAULT;
		__v4l2_ctrl_modify_range(imx219->exposure,
					 imx219->exposure->minimum,
					 exposure_max, imx219->exposure->step,
					 exposure_def);
		/*
		 * Currently PPL is fixed to IMX219_PPL_DEFAULT, so hblank
		 * depends on mode->width only, and is not changeble in any
		 * way other than changing the mode.
		 */
		hblank = IMX219_PPL_DEFAULT - mode->width;
		__v4l2_ctrl_modify_range(imx219->hblank, hblank, hblank, 1,
					 hblank);
	}

	mutex_unlock(&imx219->mutex);

	return 0;
}

static int imx219_set_framefmt(struct imx219 *imx219)
{
	switch (imx219->fmt.code) {
	case MEDIA_BUS_FMT_SRGGB8_1X8:
	case MEDIA_BUS_FMT_SGRBG8_1X8:
	case MEDIA_BUS_FMT_SGBRG8_1X8:
	case MEDIA_BUS_FMT_SBGGR8_1X8:
		return imx219_write_regs(imx219, raw8_framefmt_regs,
					ARRAY_SIZE(raw8_framefmt_regs));

	case MEDIA_BUS_FMT_SRGGB10_1X10:
	case MEDIA_BUS_FMT_SGRBG10_1X10:
	case MEDIA_BUS_FMT_SGBRG10_1X10:
	case MEDIA_BUS_FMT_SBGGR10_1X10:
		return imx219_write_regs(imx219, raw10_framefmt_regs,
					ARRAY_SIZE(raw10_framefmt_regs));
	}

	return -EINVAL;
}

static const struct v4l2_rect *
__imx219_get_pad_crop(struct imx219 *imx219, 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(&imx219->sd, cfg, pad);
	case V4L2_SUBDEV_FORMAT_ACTIVE:
		return &imx219->mode->crop;
	}

	return NULL;
}

static int imx219_get_selection(struct v4l2_subdev *sd,
				struct v4l2_subdev_pad_config *cfg,
				struct v4l2_subdev_selection *sel)
{
	switch (sel->target) {
	case V4L2_SEL_TGT_CROP: {
		struct imx219 *imx219 = to_imx219(sd);

		mutex_lock(&imx219->mutex);
		sel->r = *__imx219_get_pad_crop(imx219, cfg, sel->pad,
						sel->which);
		mutex_unlock(&imx219->mutex);

		return 0;
	}

	case V4L2_SEL_TGT_NATIVE_SIZE:
		sel->r.top = 0;
		sel->r.left = 0;
		sel->r.width = IMX219_NATIVE_WIDTH;
		sel->r.height = IMX219_NATIVE_HEIGHT;

		return 0;

	case V4L2_SEL_TGT_CROP_DEFAULT:
	case V4L2_SEL_TGT_CROP_BOUNDS:
		sel->r.top = IMX219_PIXEL_ARRAY_TOP;
		sel->r.left = IMX219_PIXEL_ARRAY_LEFT;
		sel->r.width = IMX219_PIXEL_ARRAY_WIDTH;
		sel->r.height = IMX219_PIXEL_ARRAY_HEIGHT;

		return 0;
	}

	return -EINVAL;
}

static int imx219_start_streaming(struct imx219 *imx219)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd);
	const struct imx219_reg_list *reg_list;
	int ret;

	/* Apply default values of current mode */
	reg_list = &imx219->mode->reg_list;
	ret = imx219_write_regs(imx219, reg_list->regs, reg_list->num_of_regs);
	if (ret) {
		dev_err(&client->dev, "%s failed to set mode\n", __func__);
		return ret;
	}

	ret = imx219_set_framefmt(imx219);
	if (ret) {
		dev_err(&client->dev, "%s failed to set frame format: %d\n",
			__func__, ret);
		return ret;
	}

	/* Apply customized values from user */
	ret =  __v4l2_ctrl_handler_setup(imx219->sd.ctrl_handler);
	if (ret)
		return ret;

	/* set stream on register */
	return imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
				IMX219_REG_VALUE_08BIT, IMX219_MODE_STREAMING);
}

static void imx219_stop_streaming(struct imx219 *imx219)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd);
	int ret;

	/* set stream off register */
	ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
			       IMX219_REG_VALUE_08BIT, IMX219_MODE_STANDBY);
	if (ret)
		dev_err(&client->dev, "%s failed to set stream\n", __func__);
}

static int imx219_set_stream(struct v4l2_subdev *sd, int enable)
{
	struct imx219 *imx219 = to_imx219(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int ret = 0;

	mutex_lock(&imx219->mutex);
	if (imx219->streaming == enable) {
		mutex_unlock(&imx219->mutex);
		return 0;
	}

	if (enable) {
		ret = pm_runtime_get_sync(&client->dev);
		if (ret < 0) {
			pm_runtime_put_noidle(&client->dev);
			goto err_unlock;
		}

		/*
		 * Apply default & customized values
		 * and then start streaming.
		 */
		ret = imx219_start_streaming(imx219);
		if (ret)
			goto err_rpm_put;
	} else {
		imx219_stop_streaming(imx219);
		pm_runtime_put(&client->dev);
	}

	imx219->streaming = enable;

	/* vflip and hflip cannot change during streaming */
	__v4l2_ctrl_grab(imx219->vflip, enable);
	__v4l2_ctrl_grab(imx219->hflip, enable);

	mutex_unlock(&imx219->mutex);

	return ret;

err_rpm_put:
	pm_runtime_put(&client->dev);
err_unlock:
	mutex_unlock(&imx219->mutex);

	return ret;
}

/* Power/clock management functions */
static int imx219_power_on(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx219 *imx219 = to_imx219(sd);
	int ret;

	ret = regulator_bulk_enable(IMX219_NUM_SUPPLIES,
				    imx219->supplies);
	if (ret) {
		dev_err(&client->dev, "%s: failed to enable regulators\n",
			__func__);
		return ret;
	}

	ret = clk_prepare_enable(imx219->xclk);
	if (ret) {
		dev_err(&client->dev, "%s: failed to enable clock\n",
			__func__);
		goto reg_off;
	}

	gpiod_set_value_cansleep(imx219->reset_gpio, 1);
	usleep_range(IMX219_XCLR_MIN_DELAY_US,
		     IMX219_XCLR_MIN_DELAY_US + IMX219_XCLR_DELAY_RANGE_US);

	return 0;

reg_off:
	regulator_bulk_disable(IMX219_NUM_SUPPLIES, imx219->supplies);

	return ret;
}

static int imx219_power_off(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx219 *imx219 = to_imx219(sd);

	gpiod_set_value_cansleep(imx219->reset_gpio, 0);
	regulator_bulk_disable(IMX219_NUM_SUPPLIES, imx219->supplies);
	clk_disable_unprepare(imx219->xclk);

	return 0;
}

static int __maybe_unused imx219_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx219 *imx219 = to_imx219(sd);

	if (imx219->streaming)
		imx219_stop_streaming(imx219);

	return 0;
}

static int __maybe_unused imx219_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx219 *imx219 = to_imx219(sd);
	int ret;

	if (imx219->streaming) {
		ret = imx219_start_streaming(imx219);
		if (ret)
			goto error;
	}

	return 0;

error:
	imx219_stop_streaming(imx219);
	imx219->streaming = false;

	return ret;
}

static int imx219_get_regulators(struct imx219 *imx219)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd);
	unsigned int i;

	for (i = 0; i < IMX219_NUM_SUPPLIES; i++)
		imx219->supplies[i].supply = imx219_supply_name[i];

	return devm_regulator_bulk_get(&client->dev,
				       IMX219_NUM_SUPPLIES,
				       imx219->supplies);
}

/* Verify chip ID */
static int imx219_identify_module(struct imx219 *imx219)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd);
	int ret;
	u32 val;

	ret = imx219_read_reg(imx219, IMX219_REG_CHIP_ID,
			      IMX219_REG_VALUE_16BIT, &val);
	if (ret) {
		dev_err(&client->dev, "failed to read chip id %x\n",
			IMX219_CHIP_ID);
		return ret;
	}

	if (val != IMX219_CHIP_ID) {
		dev_err(&client->dev, "chip id mismatch: %x!=%x\n",
			IMX219_CHIP_ID, val);
		return -EIO;
	}

	return 0;
}

static const struct v4l2_subdev_core_ops imx219_core_ops = {
	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
};

static const struct v4l2_subdev_video_ops imx219_video_ops = {
	.s_stream = imx219_set_stream,
};

static const struct v4l2_subdev_pad_ops imx219_pad_ops = {
	.enum_mbus_code = imx219_enum_mbus_code,
	.get_fmt = imx219_get_pad_format,
	.set_fmt = imx219_set_pad_format,
	.get_selection = imx219_get_selection,
	.enum_frame_size = imx219_enum_frame_size,
};

static const struct v4l2_subdev_ops imx219_subdev_ops = {
	.core = &imx219_core_ops,
	.video = &imx219_video_ops,
	.pad = &imx219_pad_ops,
};

static const struct v4l2_subdev_internal_ops imx219_internal_ops = {
	.open = imx219_open,
};

/* Initialize control handlers */
static int imx219_init_controls(struct imx219 *imx219)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd);
	struct v4l2_ctrl_handler *ctrl_hdlr;
	unsigned int height = imx219->mode->height;
	struct v4l2_fwnode_device_properties props;
	int exposure_max, exposure_def, hblank;
	int i, ret;

	ctrl_hdlr = &imx219->ctrl_handler;
	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 11);
	if (ret)
		return ret;

	mutex_init(&imx219->mutex);
	ctrl_hdlr->lock = &imx219->mutex;

	/* By default, PIXEL_RATE is read only */
	imx219->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, &imx219_ctrl_ops,
					       V4L2_CID_PIXEL_RATE,
					       IMX219_PIXEL_RATE,
					       IMX219_PIXEL_RATE, 1,
					       IMX219_PIXEL_RATE);

	/* Initial vblank/hblank/exposure parameters based on current mode */
	imx219->vblank = v4l2_ctrl_new_std(ctrl_hdlr, &imx219_ctrl_ops,
					   V4L2_CID_VBLANK, IMX219_VBLANK_MIN,
					   IMX219_VTS_MAX - height, 1,
					   imx219->mode->vts_def - height);
	hblank = IMX219_PPL_DEFAULT - imx219->mode->width;
	imx219->hblank = v4l2_ctrl_new_std(ctrl_hdlr, &imx219_ctrl_ops,
					   V4L2_CID_HBLANK, hblank, hblank,
					   1, hblank);
	if (imx219->hblank)
		imx219->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
	exposure_max = imx219->mode->vts_def - 4;
	exposure_def = (exposure_max < IMX219_EXPOSURE_DEFAULT) ?
		exposure_max : IMX219_EXPOSURE_DEFAULT;
	imx219->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &imx219_ctrl_ops,
					     V4L2_CID_EXPOSURE,
					     IMX219_EXPOSURE_MIN, exposure_max,
					     IMX219_EXPOSURE_STEP,
					     exposure_def);

	v4l2_ctrl_new_std(ctrl_hdlr, &imx219_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,
			  IMX219_ANA_GAIN_MIN, IMX219_ANA_GAIN_MAX,
			  IMX219_ANA_GAIN_STEP, IMX219_ANA_GAIN_DEFAULT);

	v4l2_ctrl_new_std(ctrl_hdlr, &imx219_ctrl_ops, V4L2_CID_DIGITAL_GAIN,
			  IMX219_DGTL_GAIN_MIN, IMX219_DGTL_GAIN_MAX,
			  IMX219_DGTL_GAIN_STEP, IMX219_DGTL_GAIN_DEFAULT);

	imx219->hflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx219_ctrl_ops,
					  V4L2_CID_HFLIP, 0, 1, 1, 0);
	if (imx219->hflip)
		imx219->hflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;

	imx219->vflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx219_ctrl_ops,
					  V4L2_CID_VFLIP, 0, 1, 1, 0);
	if (imx219->vflip)
		imx219->vflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;

	v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &imx219_ctrl_ops,
				     V4L2_CID_TEST_PATTERN,
				     ARRAY_SIZE(imx219_test_pattern_menu) - 1,
				     0, 0, imx219_test_pattern_menu);
	for (i = 0; i < 4; i++) {
		/*
		 * The assumption is that
		 * V4L2_CID_TEST_PATTERN_GREENR == V4L2_CID_TEST_PATTERN_RED + 1
		 * V4L2_CID_TEST_PATTERN_BLUE   == V4L2_CID_TEST_PATTERN_RED + 2
		 * V4L2_CID_TEST_PATTERN_GREENB == V4L2_CID_TEST_PATTERN_RED + 3
		 */
		v4l2_ctrl_new_std(ctrl_hdlr, &imx219_ctrl_ops,
				  V4L2_CID_TEST_PATTERN_RED + i,
				  IMX219_TESTP_COLOUR_MIN,
				  IMX219_TESTP_COLOUR_MAX,
				  IMX219_TESTP_COLOUR_STEP,
				  IMX219_TESTP_COLOUR_MAX);
		/* The "Solid color" pattern is white by default */
	}

	if (ctrl_hdlr->error) {
		ret = ctrl_hdlr->error;
		dev_err(&client->dev, "%s control init failed (%d)\n",
			__func__, ret);
		goto error;
	}

	ret = v4l2_fwnode_device_parse(&client->dev, &props);
	if (ret)
		goto error;

	ret = v4l2_ctrl_new_fwnode_properties(ctrl_hdlr, &imx219_ctrl_ops,
					      &props);
	if (ret)
		goto error;

	imx219->sd.ctrl_handler = ctrl_hdlr;

	return 0;

error:
	v4l2_ctrl_handler_free(ctrl_hdlr);
	mutex_destroy(&imx219->mutex);

	return ret;
}

static void imx219_free_controls(struct imx219 *imx219)
{
	v4l2_ctrl_handler_free(imx219->sd.ctrl_handler);
	mutex_destroy(&imx219->mutex);
}

static int imx219_check_hwcfg(struct device *dev)
{
	struct fwnode_handle *endpoint;
	struct v4l2_fwnode_endpoint ep_cfg = {
		.bus_type = V4L2_MBUS_CSI2_DPHY
	};
	int ret = -EINVAL;

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

	if (v4l2_fwnode_endpoint_alloc_parse(endpoint, &ep_cfg)) {
		dev_err(dev, "could not parse endpoint\n");
		goto error_out;
	}

	/* Check the number of MIPI CSI2 data lanes */
	if (ep_cfg.bus.mipi_csi2.num_data_lanes != 2) {
		dev_err(dev, "only 2 data lanes are currently supported\n");
		goto error_out;
	}

	/* Check the link frequency set in device tree */
	if (!ep_cfg.nr_of_link_frequencies) {
		dev_err(dev, "link-frequency property not found in DT\n");
		goto error_out;
	}

	if (ep_cfg.nr_of_link_frequencies != 1 ||
	    ep_cfg.link_frequencies[0] != IMX219_DEFAULT_LINK_FREQ) {
		dev_err(dev, "Link frequency not supported: %lld\n",
			ep_cfg.link_frequencies[0]);
		goto error_out;
	}

	ret = 0;

error_out:
	v4l2_fwnode_endpoint_free(&ep_cfg);
	fwnode_handle_put(endpoint);

	return ret;
}

static int imx219_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct imx219 *imx219;
	int ret;

	imx219 = devm_kzalloc(&client->dev, sizeof(*imx219), GFP_KERNEL);
	if (!imx219)
		return -ENOMEM;

	v4l2_i2c_subdev_init(&imx219->sd, client, &imx219_subdev_ops);

	/* Check the hardware configuration in device tree */
	if (imx219_check_hwcfg(dev))
		return -EINVAL;

	/* Get system clock (xclk) */
	imx219->xclk = devm_clk_get(dev, NULL);
	if (IS_ERR(imx219->xclk)) {
		dev_err(dev, "failed to get xclk\n");
		return PTR_ERR(imx219->xclk);
	}

	imx219->xclk_freq = clk_get_rate(imx219->xclk);
	if (imx219->xclk_freq != IMX219_XCLK_FREQ) {
		dev_err(dev, "xclk frequency not supported: %d Hz\n",
			imx219->xclk_freq);
		return -EINVAL;
	}

	ret = imx219_get_regulators(imx219);
	if (ret) {
		dev_err(dev, "failed to get regulators\n");
		return ret;
	}

	/* Request optional enable pin */
	imx219->reset_gpio = devm_gpiod_get_optional(dev, "reset",
						     GPIOD_OUT_HIGH);

	/*
	 * The sensor must be powered for imx219_identify_module()
	 * to be able to read the CHIP_ID register
	 */
	ret = imx219_power_on(dev);
	if (ret)
		return ret;

	ret = imx219_identify_module(imx219);
	if (ret)
		goto error_power_off;

	/* Set default mode to max resolution */
	imx219->mode = &supported_modes[0];

	/* sensor doesn't enter LP-11 state upon power up until and unless
	 * streaming is started, so upon power up switch the modes to:
	 * streaming -> standby
	 */
	ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
			       IMX219_REG_VALUE_08BIT, IMX219_MODE_STREAMING);
	if (ret < 0)
		goto error_power_off;
	usleep_range(100, 110);

	/* put sensor back to standby mode */
	ret = imx219_write_reg(imx219, IMX219_REG_MODE_SELECT,
			       IMX219_REG_VALUE_08BIT, IMX219_MODE_STANDBY);
	if (ret < 0)
		goto error_power_off;
	usleep_range(100, 110);

	ret = imx219_init_controls(imx219);
	if (ret)
		goto error_power_off;

	/* Initialize subdev */
	imx219->sd.internal_ops = &imx219_internal_ops;
	imx219->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	imx219->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;

	/* Initialize source pad */
	imx219->pad.flags = MEDIA_PAD_FL_SOURCE;

	/* Initialize default format */
	imx219_set_default_format(imx219);

	ret = media_entity_pads_init(&imx219->sd.entity, 1, &imx219->pad);
	if (ret) {
		dev_err(dev, "failed to init entity pads: %d\n", ret);
		goto error_handler_free;
	}

	ret = v4l2_async_register_subdev_sensor_common(&imx219->sd);
	if (ret < 0) {
		dev_err(dev, "failed to register sensor sub-device: %d\n", ret);
		goto error_media_entity;
	}

	/* Enable runtime PM and turn off the device */
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);
	pm_runtime_idle(dev);

	return 0;

error_media_entity:
	media_entity_cleanup(&imx219->sd.entity);

error_handler_free:
	imx219_free_controls(imx219);

error_power_off:
	imx219_power_off(dev);

	return ret;
}

static int imx219_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx219 *imx219 = to_imx219(sd);

	v4l2_async_unregister_subdev(sd);
	media_entity_cleanup(&sd->entity);
	imx219_free_controls(imx219);

	pm_runtime_disable(&client->dev);
	if (!pm_runtime_status_suspended(&client->dev))
		imx219_power_off(&client->dev);
	pm_runtime_set_suspended(&client->dev);

	return 0;
}

static const struct of_device_id imx219_dt_ids[] = {
	{ .compatible = "sony,imx219" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx219_dt_ids);

static const struct dev_pm_ops imx219_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(imx219_suspend, imx219_resume)
	SET_RUNTIME_PM_OPS(imx219_power_off, imx219_power_on, NULL)
};

static struct i2c_driver imx219_i2c_driver = {
	.driver = {
		.name = "imx219",
		.of_match_table	= imx219_dt_ids,
		.pm = &imx219_pm_ops,
	},
	.probe_new = imx219_probe,
	.remove = imx219_remove,
};

module_i2c_driver(imx219_i2c_driver);

MODULE_AUTHOR("Dave Stevenson <dave.stevenson@raspberrypi.com");
MODULE_DESCRIPTION("Sony IMX219 sensor driver");
MODULE_LICENSE("GPL v2");