Stuck at home?

Check our new online training!

Stuck at home?

All Bootlin training courses
are now available
through on-line seminars

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
/*
 * Driver for MT9V022 CMOS Image Sensor from Micron
 *
 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/videodev2.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/log2.h>
#include <linux/module.h>

#include <media/i2c/mt9v022.h>
#include <media/soc_camera.h>
#include <media/drv-intf/soc_mediabus.h>
#include <media/v4l2-subdev.h>
#include <media/v4l2-clk.h>
#include <media/v4l2-ctrls.h>

/*
 * mt9v022 i2c address 0x48, 0x4c, 0x58, 0x5c
 * The platform has to define struct i2c_board_info objects and link to them
 * from struct soc_camera_host_desc
 */

static char *sensor_type;
module_param(sensor_type, charp, S_IRUGO);
MODULE_PARM_DESC(sensor_type, "Sensor type: \"colour\" or \"monochrome\"");

/* mt9v022 selected register addresses */
#define MT9V022_CHIP_VERSION		0x00
#define MT9V022_COLUMN_START		0x01
#define MT9V022_ROW_START		0x02
#define MT9V022_WINDOW_HEIGHT		0x03
#define MT9V022_WINDOW_WIDTH		0x04
#define MT9V022_HORIZONTAL_BLANKING	0x05
#define MT9V022_VERTICAL_BLANKING	0x06
#define MT9V022_CHIP_CONTROL		0x07
#define MT9V022_SHUTTER_WIDTH1		0x08
#define MT9V022_SHUTTER_WIDTH2		0x09
#define MT9V022_SHUTTER_WIDTH_CTRL	0x0a
#define MT9V022_TOTAL_SHUTTER_WIDTH	0x0b
#define MT9V022_RESET			0x0c
#define MT9V022_READ_MODE		0x0d
#define MT9V022_MONITOR_MODE		0x0e
#define MT9V022_PIXEL_OPERATION_MODE	0x0f
#define MT9V022_LED_OUT_CONTROL		0x1b
#define MT9V022_ADC_MODE_CONTROL	0x1c
#define MT9V022_REG32			0x20
#define MT9V022_ANALOG_GAIN		0x35
#define MT9V022_BLACK_LEVEL_CALIB_CTRL	0x47
#define MT9V022_PIXCLK_FV_LV		0x74
#define MT9V022_DIGITAL_TEST_PATTERN	0x7f
#define MT9V022_AEC_AGC_ENABLE		0xAF
#define MT9V022_MAX_TOTAL_SHUTTER_WIDTH	0xBD

/* mt9v024 partial list register addresses changes with respect to mt9v022 */
#define MT9V024_PIXCLK_FV_LV		0x72
#define MT9V024_MAX_TOTAL_SHUTTER_WIDTH	0xAD

/* Progressive scan, master, defaults */
#define MT9V022_CHIP_CONTROL_DEFAULT	0x188

#define MT9V022_MAX_WIDTH		752
#define MT9V022_MAX_HEIGHT		480
#define MT9V022_MIN_WIDTH		48
#define MT9V022_MIN_HEIGHT		32
#define MT9V022_COLUMN_SKIP		1
#define MT9V022_ROW_SKIP		4

#define MT9V022_HORIZONTAL_BLANKING_MIN	43
#define MT9V022_HORIZONTAL_BLANKING_MAX	1023
#define MT9V022_HORIZONTAL_BLANKING_DEF	94
#define MT9V022_VERTICAL_BLANKING_MIN	2
#define MT9V022_VERTICAL_BLANKING_MAX	3000
#define MT9V022_VERTICAL_BLANKING_DEF	45

#define is_mt9v022_rev3(id)	(id == 0x1313)
#define is_mt9v024(id)		(id == 0x1324)

/* MT9V022 has only one fixed colorspace per pixelcode */
struct mt9v022_datafmt {
	u32	code;
	enum v4l2_colorspace		colorspace;
};

/* Find a data format by a pixel code in an array */
static const struct mt9v022_datafmt *mt9v022_find_datafmt(
	u32 code, const struct mt9v022_datafmt *fmt,
	int n)
{
	int i;
	for (i = 0; i < n; i++)
		if (fmt[i].code == code)
			return fmt + i;

	return NULL;
}

static const struct mt9v022_datafmt mt9v022_colour_fmts[] = {
	/*
	 * Order important: first natively supported,
	 * second supported with a GPIO extender
	 */
	{MEDIA_BUS_FMT_SBGGR10_1X10, V4L2_COLORSPACE_SRGB},
	{MEDIA_BUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB},
};

static const struct mt9v022_datafmt mt9v022_monochrome_fmts[] = {
	/* Order important - see above */
	{MEDIA_BUS_FMT_Y10_1X10, V4L2_COLORSPACE_JPEG},
	{MEDIA_BUS_FMT_Y8_1X8, V4L2_COLORSPACE_JPEG},
};

/* only registers with different addresses on different mt9v02x sensors */
struct mt9v02x_register {
	u8	max_total_shutter_width;
	u8	pixclk_fv_lv;
};

static const struct mt9v02x_register mt9v022_register = {
	.max_total_shutter_width	= MT9V022_MAX_TOTAL_SHUTTER_WIDTH,
	.pixclk_fv_lv			= MT9V022_PIXCLK_FV_LV,
};

static const struct mt9v02x_register mt9v024_register = {
	.max_total_shutter_width	= MT9V024_MAX_TOTAL_SHUTTER_WIDTH,
	.pixclk_fv_lv			= MT9V024_PIXCLK_FV_LV,
};

enum mt9v022_model {
	MT9V022IX7ATM,
	MT9V022IX7ATC,
};

struct mt9v022 {
	struct v4l2_subdev subdev;
	struct v4l2_ctrl_handler hdl;
	struct {
		/* exposure/auto-exposure cluster */
		struct v4l2_ctrl *autoexposure;
		struct v4l2_ctrl *exposure;
	};
	struct {
		/* gain/auto-gain cluster */
		struct v4l2_ctrl *autogain;
		struct v4l2_ctrl *gain;
	};
	struct v4l2_ctrl *hblank;
	struct v4l2_ctrl *vblank;
	struct v4l2_rect rect;	/* Sensor window */
	struct v4l2_clk *clk;
	const struct mt9v022_datafmt *fmt;
	const struct mt9v022_datafmt *fmts;
	const struct mt9v02x_register *reg;
	int num_fmts;
	enum mt9v022_model model;
	u16 chip_control;
	u16 chip_version;
	unsigned short y_skip_top;	/* Lines to skip at the top */
};

static struct mt9v022 *to_mt9v022(const struct i2c_client *client)
{
	return container_of(i2c_get_clientdata(client), struct mt9v022, subdev);
}

static int reg_read(struct i2c_client *client, const u8 reg)
{
	return i2c_smbus_read_word_swapped(client, reg);
}

static int reg_write(struct i2c_client *client, const u8 reg,
		     const u16 data)
{
	return i2c_smbus_write_word_swapped(client, reg, data);
}

static int reg_set(struct i2c_client *client, const u8 reg,
		   const u16 data)
{
	int ret;

	ret = reg_read(client, reg);
	if (ret < 0)
		return ret;
	return reg_write(client, reg, ret | data);
}

static int reg_clear(struct i2c_client *client, const u8 reg,
		     const u16 data)
{
	int ret;

	ret = reg_read(client, reg);
	if (ret < 0)
		return ret;
	return reg_write(client, reg, ret & ~data);
}

static int mt9v022_init(struct i2c_client *client)
{
	struct mt9v022 *mt9v022 = to_mt9v022(client);
	int ret;

	/*
	 * Almost the default mode: master, parallel, simultaneous, and an
	 * undocumented bit 0x200, which is present in table 7, but not in 8,
	 * plus snapshot mode to disable scan for now
	 */
	mt9v022->chip_control |= 0x10;
	ret = reg_write(client, MT9V022_CHIP_CONTROL, mt9v022->chip_control);
	if (!ret)
		ret = reg_write(client, MT9V022_READ_MODE, 0x300);

	/* All defaults */
	if (!ret)
		/* AEC, AGC on */
		ret = reg_set(client, MT9V022_AEC_AGC_ENABLE, 0x3);
	if (!ret)
		ret = reg_write(client, MT9V022_ANALOG_GAIN, 16);
	if (!ret)
		ret = reg_write(client, MT9V022_TOTAL_SHUTTER_WIDTH, 480);
	if (!ret)
		ret = reg_write(client, mt9v022->reg->max_total_shutter_width, 480);
	if (!ret)
		/* default - auto */
		ret = reg_clear(client, MT9V022_BLACK_LEVEL_CALIB_CTRL, 1);
	if (!ret)
		ret = reg_write(client, MT9V022_DIGITAL_TEST_PATTERN, 0);
	if (!ret)
		return v4l2_ctrl_handler_setup(&mt9v022->hdl);

	return ret;
}

static int mt9v022_s_stream(struct v4l2_subdev *sd, int enable)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9v022 *mt9v022 = to_mt9v022(client);

	if (enable) {
		/* Switch to master "normal" mode */
		mt9v022->chip_control &= ~0x10;
		if (is_mt9v022_rev3(mt9v022->chip_version) ||
		    is_mt9v024(mt9v022->chip_version)) {
			/*
			 * Unset snapshot mode specific settings: clear bit 9
			 * and bit 2 in reg. 0x20 when in normal mode.
			 */
			if (reg_clear(client, MT9V022_REG32, 0x204))
				return -EIO;
		}
	} else {
		/* Switch to snapshot mode */
		mt9v022->chip_control |= 0x10;
		if (is_mt9v022_rev3(mt9v022->chip_version) ||
		    is_mt9v024(mt9v022->chip_version)) {
			/*
			 * Required settings for snapshot mode: set bit 9
			 * (RST enable) and bit 2 (CR enable) in reg. 0x20
			 * See TechNote TN0960 or TN-09-225.
			 */
			if (reg_set(client, MT9V022_REG32, 0x204))
				return -EIO;
		}
	}

	if (reg_write(client, MT9V022_CHIP_CONTROL, mt9v022->chip_control) < 0)
		return -EIO;
	return 0;
}

static int mt9v022_set_selection(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_selection *sel)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9v022 *mt9v022 = to_mt9v022(client);
	struct v4l2_rect rect = sel->r;
	int min_row, min_blank;
	int ret;

	if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE ||
	    sel->target != V4L2_SEL_TGT_CROP)
		return -EINVAL;

	/* Bayer format - even size lengths */
	if (mt9v022->fmts == mt9v022_colour_fmts) {
		rect.width	= ALIGN(rect.width, 2);
		rect.height	= ALIGN(rect.height, 2);
		/* Let the user play with the starting pixel */
	}

	soc_camera_limit_side(&rect.left, &rect.width,
		     MT9V022_COLUMN_SKIP, MT9V022_MIN_WIDTH, MT9V022_MAX_WIDTH);

	soc_camera_limit_side(&rect.top, &rect.height,
		     MT9V022_ROW_SKIP, MT9V022_MIN_HEIGHT, MT9V022_MAX_HEIGHT);

	/* Like in example app. Contradicts the datasheet though */
	ret = reg_read(client, MT9V022_AEC_AGC_ENABLE);
	if (ret >= 0) {
		if (ret & 1) /* Autoexposure */
			ret = reg_write(client, mt9v022->reg->max_total_shutter_width,
					rect.height + mt9v022->y_skip_top + 43);
		/*
		 * If autoexposure is off, there is no need to set
		 * MT9V022_TOTAL_SHUTTER_WIDTH here. Autoexposure can be off
		 * only if the user has set exposure manually, using the
		 * V4L2_CID_EXPOSURE_AUTO with the value V4L2_EXPOSURE_MANUAL.
		 * In this case the register MT9V022_TOTAL_SHUTTER_WIDTH
		 * already contains the correct value.
		 */
	}
	/* Setup frame format: defaults apart from width and height */
	if (!ret)
		ret = reg_write(client, MT9V022_COLUMN_START, rect.left);
	if (!ret)
		ret = reg_write(client, MT9V022_ROW_START, rect.top);
	/*
	 * mt9v022: min total row time is 660 columns, min blanking is 43
	 * mt9v024: min total row time is 690 columns, min blanking is 61
	 */
	if (is_mt9v024(mt9v022->chip_version)) {
		min_row = 690;
		min_blank = 61;
	} else {
		min_row = 660;
		min_blank = 43;
	}
	if (!ret)
		ret = v4l2_ctrl_s_ctrl(mt9v022->hblank,
				rect.width > min_row - min_blank ?
				min_blank : min_row - rect.width);
	if (!ret)
		ret = v4l2_ctrl_s_ctrl(mt9v022->vblank, 45);
	if (!ret)
		ret = reg_write(client, MT9V022_WINDOW_WIDTH, rect.width);
	if (!ret)
		ret = reg_write(client, MT9V022_WINDOW_HEIGHT,
				rect.height + mt9v022->y_skip_top);

	if (ret < 0)
		return ret;

	dev_dbg(&client->dev, "Frame %dx%d pixel\n", rect.width, rect.height);

	mt9v022->rect = rect;

	return 0;
}

static int mt9v022_get_selection(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_selection *sel)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9v022 *mt9v022 = to_mt9v022(client);

	if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
		return -EINVAL;

	switch (sel->target) {
	case V4L2_SEL_TGT_CROP_BOUNDS:
	case V4L2_SEL_TGT_CROP_DEFAULT:
		sel->r.left = MT9V022_COLUMN_SKIP;
		sel->r.top = MT9V022_ROW_SKIP;
		sel->r.width = MT9V022_MAX_WIDTH;
		sel->r.height = MT9V022_MAX_HEIGHT;
		return 0;
	case V4L2_SEL_TGT_CROP:
		sel->r = mt9v022->rect;
		return 0;
	default:
		return -EINVAL;
	}
}

static int mt9v022_get_fmt(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_format *format)
{
	struct v4l2_mbus_framefmt *mf = &format->format;
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9v022 *mt9v022 = to_mt9v022(client);

	if (format->pad)
		return -EINVAL;

	mf->width	= mt9v022->rect.width;
	mf->height	= mt9v022->rect.height;
	mf->code	= mt9v022->fmt->code;
	mf->colorspace	= mt9v022->fmt->colorspace;
	mf->field	= V4L2_FIELD_NONE;

	return 0;
}

static int mt9v022_s_fmt(struct v4l2_subdev *sd,
			 const struct mt9v022_datafmt *fmt,
			 struct v4l2_mbus_framefmt *mf)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9v022 *mt9v022 = to_mt9v022(client);
	struct v4l2_subdev_selection sel = {
		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
		.target = V4L2_SEL_TGT_CROP,
		.r.left = mt9v022->rect.left,
		.r.top = mt9v022->rect.top,
		.r.width = mf->width,
		.r.height = mf->height,
	};
	int ret;

	/*
	 * The caller provides a supported format, as verified per call to
	 * .set_fmt(FORMAT_TRY), datawidth is from our supported format list
	 */
	switch (mf->code) {
	case MEDIA_BUS_FMT_Y8_1X8:
	case MEDIA_BUS_FMT_Y10_1X10:
		if (mt9v022->model != MT9V022IX7ATM)
			return -EINVAL;
		break;
	case MEDIA_BUS_FMT_SBGGR8_1X8:
	case MEDIA_BUS_FMT_SBGGR10_1X10:
		if (mt9v022->model != MT9V022IX7ATC)
			return -EINVAL;
		break;
	default:
		return -EINVAL;
	}

	/* No support for scaling on this camera, just crop. */
	ret = mt9v022_set_selection(sd, NULL, &sel);
	if (!ret) {
		mf->width	= mt9v022->rect.width;
		mf->height	= mt9v022->rect.height;
		mt9v022->fmt	= fmt;
		mf->colorspace	= fmt->colorspace;
	}

	return ret;
}

static int mt9v022_set_fmt(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_format *format)
{
	struct v4l2_mbus_framefmt *mf = &format->format;
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9v022 *mt9v022 = to_mt9v022(client);
	const struct mt9v022_datafmt *fmt;
	int align = mf->code == MEDIA_BUS_FMT_SBGGR8_1X8 ||
		mf->code == MEDIA_BUS_FMT_SBGGR10_1X10;

	if (format->pad)
		return -EINVAL;

	v4l_bound_align_image(&mf->width, MT9V022_MIN_WIDTH,
		MT9V022_MAX_WIDTH, align,
		&mf->height, MT9V022_MIN_HEIGHT + mt9v022->y_skip_top,
		MT9V022_MAX_HEIGHT + mt9v022->y_skip_top, align, 0);

	fmt = mt9v022_find_datafmt(mf->code, mt9v022->fmts,
				   mt9v022->num_fmts);
	if (!fmt) {
		fmt = mt9v022->fmt;
		mf->code = fmt->code;
	}

	mf->colorspace	= fmt->colorspace;

	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
		return mt9v022_s_fmt(sd, fmt, mf);
	cfg->try_fmt = *mf;
	return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int mt9v022_g_register(struct v4l2_subdev *sd,
			      struct v4l2_dbg_register *reg)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (reg->reg > 0xff)
		return -EINVAL;

	reg->size = 2;
	reg->val = reg_read(client, reg->reg);

	if (reg->val > 0xffff)
		return -EIO;

	return 0;
}

static int mt9v022_s_register(struct v4l2_subdev *sd,
			      const struct v4l2_dbg_register *reg)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (reg->reg > 0xff)
		return -EINVAL;

	if (reg_write(client, reg->reg, reg->val) < 0)
		return -EIO;

	return 0;
}
#endif

static int mt9v022_s_power(struct v4l2_subdev *sd, int on)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
	struct mt9v022 *mt9v022 = to_mt9v022(client);

	return soc_camera_set_power(&client->dev, ssdd, mt9v022->clk, on);
}

static int mt9v022_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
{
	struct mt9v022 *mt9v022 = container_of(ctrl->handler,
					       struct mt9v022, hdl);
	struct v4l2_subdev *sd = &mt9v022->subdev;
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct v4l2_ctrl *gain = mt9v022->gain;
	struct v4l2_ctrl *exp = mt9v022->exposure;
	unsigned long range;
	int data;

	switch (ctrl->id) {
	case V4L2_CID_AUTOGAIN:
		data = reg_read(client, MT9V022_ANALOG_GAIN);
		if (data < 0)
			return -EIO;

		range = gain->maximum - gain->minimum;
		gain->val = ((data - 16) * range + 24) / 48 + gain->minimum;
		return 0;
	case V4L2_CID_EXPOSURE_AUTO:
		data = reg_read(client, MT9V022_TOTAL_SHUTTER_WIDTH);
		if (data < 0)
			return -EIO;

		range = exp->maximum - exp->minimum;
		exp->val = ((data - 1) * range + 239) / 479 + exp->minimum;
		return 0;
	case V4L2_CID_HBLANK:
		data = reg_read(client, MT9V022_HORIZONTAL_BLANKING);
		if (data < 0)
			return -EIO;
		ctrl->val = data;
		return 0;
	case V4L2_CID_VBLANK:
		data = reg_read(client, MT9V022_VERTICAL_BLANKING);
		if (data < 0)
			return -EIO;
		ctrl->val = data;
		return 0;
	}
	return -EINVAL;
}

static int mt9v022_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct mt9v022 *mt9v022 = container_of(ctrl->handler,
					       struct mt9v022, hdl);
	struct v4l2_subdev *sd = &mt9v022->subdev;
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int data;

	switch (ctrl->id) {
	case V4L2_CID_VFLIP:
		if (ctrl->val)
			data = reg_set(client, MT9V022_READ_MODE, 0x10);
		else
			data = reg_clear(client, MT9V022_READ_MODE, 0x10);
		if (data < 0)
			return -EIO;
		return 0;
	case V4L2_CID_HFLIP:
		if (ctrl->val)
			data = reg_set(client, MT9V022_READ_MODE, 0x20);
		else
			data = reg_clear(client, MT9V022_READ_MODE, 0x20);
		if (data < 0)
			return -EIO;
		return 0;
	case V4L2_CID_AUTOGAIN:
		if (ctrl->val) {
			if (reg_set(client, MT9V022_AEC_AGC_ENABLE, 0x2) < 0)
				return -EIO;
		} else {
			struct v4l2_ctrl *gain = mt9v022->gain;
			/* mt9v022 has minimum == default */
			unsigned long range = gain->maximum - gain->minimum;
			/* Valid values 16 to 64, 32 to 64 must be even. */
			unsigned long gain_val = ((gain->val - (s32)gain->minimum) *
					      48 + range / 2) / range + 16;

			if (gain_val >= 32)
				gain_val &= ~1;

			/*
			 * The user wants to set gain manually, hope, she
			 * knows, what she's doing... Switch AGC off.
			 */
			if (reg_clear(client, MT9V022_AEC_AGC_ENABLE, 0x2) < 0)
				return -EIO;

			dev_dbg(&client->dev, "Setting gain from %d to %lu\n",
				reg_read(client, MT9V022_ANALOG_GAIN), gain_val);
			if (reg_write(client, MT9V022_ANALOG_GAIN, gain_val) < 0)
				return -EIO;
		}
		return 0;
	case V4L2_CID_EXPOSURE_AUTO:
		if (ctrl->val == V4L2_EXPOSURE_AUTO) {
			data = reg_set(client, MT9V022_AEC_AGC_ENABLE, 0x1);
		} else {
			struct v4l2_ctrl *exp = mt9v022->exposure;
			unsigned long range = exp->maximum - exp->minimum;
			unsigned long shutter = ((exp->val - (s32)exp->minimum) *
					479 + range / 2) / range + 1;

			/*
			 * The user wants to set shutter width manually, hope,
			 * she knows, what she's doing... Switch AEC off.
			 */
			data = reg_clear(client, MT9V022_AEC_AGC_ENABLE, 0x1);
			if (data < 0)
				return -EIO;
			dev_dbg(&client->dev, "Shutter width from %d to %lu\n",
					reg_read(client, MT9V022_TOTAL_SHUTTER_WIDTH),
					shutter);
			if (reg_write(client, MT9V022_TOTAL_SHUTTER_WIDTH,
						shutter) < 0)
				return -EIO;
		}
		return 0;
	case V4L2_CID_HBLANK:
		if (reg_write(client, MT9V022_HORIZONTAL_BLANKING,
				ctrl->val) < 0)
			return -EIO;
		return 0;
	case V4L2_CID_VBLANK:
		if (reg_write(client, MT9V022_VERTICAL_BLANKING,
				ctrl->val) < 0)
			return -EIO;
		return 0;
	}
	return -EINVAL;
}

/*
 * Interface active, can use i2c. If it fails, it can indeed mean, that
 * this wasn't our capture interface, so, we wait for the right one
 */
static int mt9v022_video_probe(struct i2c_client *client)
{
	struct mt9v022 *mt9v022 = to_mt9v022(client);
	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
	s32 data;
	int ret;
	unsigned long flags;

	ret = mt9v022_s_power(&mt9v022->subdev, 1);
	if (ret < 0)
		return ret;

	/* Read out the chip version register */
	data = reg_read(client, MT9V022_CHIP_VERSION);

	/* must be 0x1311, 0x1313 or 0x1324 */
	if (data != 0x1311 && data != 0x1313 && data != 0x1324) {
		ret = -ENODEV;
		dev_info(&client->dev, "No MT9V022 found, ID register 0x%x\n",
			 data);
		goto ei2c;
	}

	mt9v022->chip_version = data;

	mt9v022->reg = is_mt9v024(data) ? &mt9v024_register :
			&mt9v022_register;

	/* Soft reset */
	ret = reg_write(client, MT9V022_RESET, 1);
	if (ret < 0)
		goto ei2c;
	/* 15 clock cycles */
	udelay(200);
	if (reg_read(client, MT9V022_RESET)) {
		dev_err(&client->dev, "Resetting MT9V022 failed!\n");
		if (ret > 0)
			ret = -EIO;
		goto ei2c;
	}

	/* Set monochrome or colour sensor type */
	if (sensor_type && (!strcmp("colour", sensor_type) ||
			    !strcmp("color", sensor_type))) {
		ret = reg_write(client, MT9V022_PIXEL_OPERATION_MODE, 4 | 0x11);
		mt9v022->model = MT9V022IX7ATC;
		mt9v022->fmts = mt9v022_colour_fmts;
	} else {
		ret = reg_write(client, MT9V022_PIXEL_OPERATION_MODE, 0x11);
		mt9v022->model = MT9V022IX7ATM;
		mt9v022->fmts = mt9v022_monochrome_fmts;
	}

	if (ret < 0)
		goto ei2c;

	mt9v022->num_fmts = 0;

	/*
	 * This is a 10bit sensor, so by default we only allow 10bit.
	 * The platform may support different bus widths due to
	 * different routing of the data lines.
	 */
	if (ssdd->query_bus_param)
		flags = ssdd->query_bus_param(ssdd);
	else
		flags = SOCAM_DATAWIDTH_10;

	if (flags & SOCAM_DATAWIDTH_10)
		mt9v022->num_fmts++;
	else
		mt9v022->fmts++;

	if (flags & SOCAM_DATAWIDTH_8)
		mt9v022->num_fmts++;

	mt9v022->fmt = &mt9v022->fmts[0];

	dev_info(&client->dev, "Detected a MT9V022 chip ID %x, %s sensor\n",
		 data, mt9v022->model == MT9V022IX7ATM ?
		 "monochrome" : "colour");

	ret = mt9v022_init(client);
	if (ret < 0)
		dev_err(&client->dev, "Failed to initialise the camera\n");

ei2c:
	mt9v022_s_power(&mt9v022->subdev, 0);
	return ret;
}

static int mt9v022_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9v022 *mt9v022 = to_mt9v022(client);

	*lines = mt9v022->y_skip_top;

	return 0;
}

static const struct v4l2_ctrl_ops mt9v022_ctrl_ops = {
	.g_volatile_ctrl = mt9v022_g_volatile_ctrl,
	.s_ctrl = mt9v022_s_ctrl,
};

static const struct v4l2_subdev_core_ops mt9v022_subdev_core_ops = {
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.g_register	= mt9v022_g_register,
	.s_register	= mt9v022_s_register,
#endif
	.s_power	= mt9v022_s_power,
};

static int mt9v022_enum_mbus_code(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_mbus_code_enum *code)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9v022 *mt9v022 = to_mt9v022(client);

	if (code->pad || code->index >= mt9v022->num_fmts)
		return -EINVAL;

	code->code = mt9v022->fmts[code->index].code;
	return 0;
}

static int mt9v022_g_mbus_config(struct v4l2_subdev *sd,
				struct v4l2_mbus_config *cfg)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);

	cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_SLAVE |
		V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING |
		V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW |
		V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW |
		V4L2_MBUS_DATA_ACTIVE_HIGH;
	cfg->type = V4L2_MBUS_PARALLEL;
	cfg->flags = soc_camera_apply_board_flags(ssdd, cfg);

	return 0;
}

static int mt9v022_s_mbus_config(struct v4l2_subdev *sd,
				 const struct v4l2_mbus_config *cfg)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
	struct mt9v022 *mt9v022 = to_mt9v022(client);
	unsigned long flags = soc_camera_apply_board_flags(ssdd, cfg);
	unsigned int bps = soc_mbus_get_fmtdesc(mt9v022->fmt->code)->bits_per_sample;
	int ret;
	u16 pixclk = 0;

	if (ssdd->set_bus_param) {
		ret = ssdd->set_bus_param(ssdd, 1 << (bps - 1));
		if (ret)
			return ret;
	} else if (bps != 10) {
		/*
		 * Without board specific bus width settings we only support the
		 * sensors native bus width
		 */
		return -EINVAL;
	}

	if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
		pixclk |= 0x10;

	if (!(flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH))
		pixclk |= 0x1;

	if (!(flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH))
		pixclk |= 0x2;

	ret = reg_write(client, mt9v022->reg->pixclk_fv_lv, pixclk);
	if (ret < 0)
		return ret;

	if (!(flags & V4L2_MBUS_MASTER))
		mt9v022->chip_control &= ~0x8;

	ret = reg_write(client, MT9V022_CHIP_CONTROL, mt9v022->chip_control);
	if (ret < 0)
		return ret;

	dev_dbg(&client->dev, "Calculated pixclk 0x%x, chip control 0x%x\n",
		pixclk, mt9v022->chip_control);

	return 0;
}

static const struct v4l2_subdev_video_ops mt9v022_subdev_video_ops = {
	.s_stream	= mt9v022_s_stream,
	.g_mbus_config	= mt9v022_g_mbus_config,
	.s_mbus_config	= mt9v022_s_mbus_config,
};

static const struct v4l2_subdev_sensor_ops mt9v022_subdev_sensor_ops = {
	.g_skip_top_lines	= mt9v022_g_skip_top_lines,
};

static const struct v4l2_subdev_pad_ops mt9v022_subdev_pad_ops = {
	.enum_mbus_code = mt9v022_enum_mbus_code,
	.get_selection	= mt9v022_get_selection,
	.set_selection	= mt9v022_set_selection,
	.get_fmt	= mt9v022_get_fmt,
	.set_fmt	= mt9v022_set_fmt,
};

static const struct v4l2_subdev_ops mt9v022_subdev_ops = {
	.core	= &mt9v022_subdev_core_ops,
	.video	= &mt9v022_subdev_video_ops,
	.sensor	= &mt9v022_subdev_sensor_ops,
	.pad	= &mt9v022_subdev_pad_ops,
};

static int mt9v022_probe(struct i2c_client *client,
			 const struct i2c_device_id *did)
{
	struct mt9v022 *mt9v022;
	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	struct mt9v022_platform_data *pdata;
	int ret;

	if (!ssdd) {
		dev_err(&client->dev, "MT9V022 driver needs platform data\n");
		return -EINVAL;
	}

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
		dev_warn(&adapter->dev,
			 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
		return -EIO;
	}

	mt9v022 = devm_kzalloc(&client->dev, sizeof(struct mt9v022), GFP_KERNEL);
	if (!mt9v022)
		return -ENOMEM;

	pdata = ssdd->drv_priv;
	v4l2_i2c_subdev_init(&mt9v022->subdev, client, &mt9v022_subdev_ops);
	v4l2_ctrl_handler_init(&mt9v022->hdl, 6);
	v4l2_ctrl_new_std(&mt9v022->hdl, &mt9v022_ctrl_ops,
			V4L2_CID_VFLIP, 0, 1, 1, 0);
	v4l2_ctrl_new_std(&mt9v022->hdl, &mt9v022_ctrl_ops,
			V4L2_CID_HFLIP, 0, 1, 1, 0);
	mt9v022->autogain = v4l2_ctrl_new_std(&mt9v022->hdl, &mt9v022_ctrl_ops,
			V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
	mt9v022->gain = v4l2_ctrl_new_std(&mt9v022->hdl, &mt9v022_ctrl_ops,
			V4L2_CID_GAIN, 0, 127, 1, 64);

	/*
	 * Simulated autoexposure. If enabled, we calculate shutter width
	 * ourselves in the driver based on vertical blanking and frame width
	 */
	mt9v022->autoexposure = v4l2_ctrl_new_std_menu(&mt9v022->hdl,
			&mt9v022_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
			V4L2_EXPOSURE_AUTO);
	mt9v022->exposure = v4l2_ctrl_new_std(&mt9v022->hdl, &mt9v022_ctrl_ops,
			V4L2_CID_EXPOSURE, 1, 255, 1, 255);

	mt9v022->hblank = v4l2_ctrl_new_std(&mt9v022->hdl, &mt9v022_ctrl_ops,
			V4L2_CID_HBLANK, MT9V022_HORIZONTAL_BLANKING_MIN,
			MT9V022_HORIZONTAL_BLANKING_MAX, 1,
			MT9V022_HORIZONTAL_BLANKING_DEF);

	mt9v022->vblank = v4l2_ctrl_new_std(&mt9v022->hdl, &mt9v022_ctrl_ops,
			V4L2_CID_VBLANK, MT9V022_VERTICAL_BLANKING_MIN,
			MT9V022_VERTICAL_BLANKING_MAX, 1,
			MT9V022_VERTICAL_BLANKING_DEF);

	mt9v022->subdev.ctrl_handler = &mt9v022->hdl;
	if (mt9v022->hdl.error) {
		int err = mt9v022->hdl.error;

		dev_err(&client->dev, "control initialisation err %d\n", err);
		return err;
	}
	v4l2_ctrl_auto_cluster(2, &mt9v022->autoexposure,
				V4L2_EXPOSURE_MANUAL, true);
	v4l2_ctrl_auto_cluster(2, &mt9v022->autogain, 0, true);

	mt9v022->chip_control = MT9V022_CHIP_CONTROL_DEFAULT;

	/*
	 * On some platforms the first read out line is corrupted.
	 * Workaround it by skipping if indicated by platform data.
	 */
	mt9v022->y_skip_top	= pdata ? pdata->y_skip_top : 0;
	mt9v022->rect.left	= MT9V022_COLUMN_SKIP;
	mt9v022->rect.top	= MT9V022_ROW_SKIP;
	mt9v022->rect.width	= MT9V022_MAX_WIDTH;
	mt9v022->rect.height	= MT9V022_MAX_HEIGHT;

	mt9v022->clk = v4l2_clk_get(&client->dev, "mclk");
	if (IS_ERR(mt9v022->clk)) {
		ret = PTR_ERR(mt9v022->clk);
		goto eclkget;
	}

	ret = mt9v022_video_probe(client);
	if (ret) {
		v4l2_clk_put(mt9v022->clk);
eclkget:
		v4l2_ctrl_handler_free(&mt9v022->hdl);
	}

	return ret;
}

static int mt9v022_remove(struct i2c_client *client)
{
	struct mt9v022 *mt9v022 = to_mt9v022(client);
	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);

	v4l2_clk_put(mt9v022->clk);
	v4l2_device_unregister_subdev(&mt9v022->subdev);
	if (ssdd->free_bus)
		ssdd->free_bus(ssdd);
	v4l2_ctrl_handler_free(&mt9v022->hdl);

	return 0;
}
static const struct i2c_device_id mt9v022_id[] = {
	{ "mt9v022", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mt9v022_id);

static struct i2c_driver mt9v022_i2c_driver = {
	.driver = {
		.name = "mt9v022",
	},
	.probe		= mt9v022_probe,
	.remove		= mt9v022_remove,
	.id_table	= mt9v022_id,
};

module_i2c_driver(mt9v022_i2c_driver);

MODULE_DESCRIPTION("Micron MT9V022 Camera driver");
MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
MODULE_LICENSE("GPL");