summaryrefslogtreecommitdiffstats
path: root/drivers/media/i2c/soc_camera/ov9640.c
blob: c639489896883417cfe4179fe0568f7a27f6677a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
/*
 * OmniVision OV96xx Camera Driver
 *
 * Copyright (C) 2009 Marek Vasut <marek.vasut@gmail.com>
 *
 * Based on ov772x camera driver:
 *
 * Copyright (C) 2008 Renesas Solutions Corp.
 * Kuninori Morimoto <morimoto.kuninori@renesas.com>
 *
 * Based on ov7670 and soc_camera_platform driver,
 *
 * Copyright 2006-7 Jonathan Corbet <corbet@lwn.net>
 * Copyright (C) 2008 Magnus Damm
 * 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/init.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/v4l2-mediabus.h>
#include <linux/videodev2.h>

#include <media/soc_camera.h>
#include <media/v4l2-clk.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ctrls.h>

#include "ov9640.h"

#define to_ov9640_sensor(sd)	container_of(sd, struct ov9640_priv, subdev)

/* default register setup */
static const struct ov9640_reg ov9640_regs_dflt[] = {
	{ OV9640_COM5,	OV9640_COM5_SYSCLK | OV9640_COM5_LONGEXP },
	{ OV9640_COM6,	OV9640_COM6_OPT_BLC | OV9640_COM6_ADBLC_BIAS |
			OV9640_COM6_FMT_RST | OV9640_COM6_ADBLC_OPTEN },
	{ OV9640_PSHFT,	OV9640_PSHFT_VAL(0x01) },
	{ OV9640_ACOM,	OV9640_ACOM_2X_ANALOG | OV9640_ACOM_RSVD },
	{ OV9640_TSLB,	OV9640_TSLB_YUYV_UYVY },
	{ OV9640_COM16,	OV9640_COM16_RB_AVG },

	/* Gamma curve P */
	{ 0x6c, 0x40 },	{ 0x6d, 0x30 },	{ 0x6e, 0x4b },	{ 0x6f, 0x60 },
	{ 0x70, 0x70 },	{ 0x71, 0x70 },	{ 0x72, 0x70 },	{ 0x73, 0x70 },
	{ 0x74, 0x60 },	{ 0x75, 0x60 },	{ 0x76, 0x50 },	{ 0x77, 0x48 },
	{ 0x78, 0x3a },	{ 0x79, 0x2e },	{ 0x7a, 0x28 },	{ 0x7b, 0x22 },

	/* Gamma curve T */
	{ 0x7c, 0x04 },	{ 0x7d, 0x07 },	{ 0x7e, 0x10 },	{ 0x7f, 0x28 },
	{ 0x80, 0x36 },	{ 0x81, 0x44 },	{ 0x82, 0x52 },	{ 0x83, 0x60 },
	{ 0x84, 0x6c },	{ 0x85, 0x78 },	{ 0x86, 0x8c },	{ 0x87, 0x9e },
	{ 0x88, 0xbb },	{ 0x89, 0xd2 },	{ 0x8a, 0xe6 },
};

/* Configurations
 * NOTE: for YUV, alter the following registers:
 *		COM12 |= OV9640_COM12_YUV_AVG
 *
 *	 for RGB, alter the following registers:
 *		COM7  |= OV9640_COM7_RGB
 *		COM13 |= OV9640_COM13_RGB_AVG
 *		COM15 |= proper RGB color encoding mode
 */
static const struct ov9640_reg ov9640_regs_qqcif[] = {
	{ OV9640_CLKRC,	OV9640_CLKRC_DPLL_EN | OV9640_CLKRC_DIV(0x0f) },
	{ OV9640_COM1,	OV9640_COM1_QQFMT | OV9640_COM1_HREF_2SKIP },
	{ OV9640_COM4,	OV9640_COM4_QQ_VP | OV9640_COM4_RSVD },
	{ OV9640_COM7,	OV9640_COM7_QCIF },
	{ OV9640_COM12,	OV9640_COM12_RSVD },
	{ OV9640_COM13,	OV9640_COM13_GAMMA_RAW | OV9640_COM13_MATRIX_EN },
	{ OV9640_COM15,	OV9640_COM15_OR_10F0 },
};

static const struct ov9640_reg ov9640_regs_qqvga[] = {
	{ OV9640_CLKRC,	OV9640_CLKRC_DPLL_EN | OV9640_CLKRC_DIV(0x07) },
	{ OV9640_COM1,	OV9640_COM1_QQFMT | OV9640_COM1_HREF_2SKIP },
	{ OV9640_COM4,	OV9640_COM4_QQ_VP | OV9640_COM4_RSVD },
	{ OV9640_COM7,	OV9640_COM7_QVGA },
	{ OV9640_COM12,	OV9640_COM12_RSVD },
	{ OV9640_COM13,	OV9640_COM13_GAMMA_RAW | OV9640_COM13_MATRIX_EN },
	{ OV9640_COM15,	OV9640_COM15_OR_10F0 },
};

static const struct ov9640_reg ov9640_regs_qcif[] = {
	{ OV9640_CLKRC,	OV9640_CLKRC_DPLL_EN | OV9640_CLKRC_DIV(0x07) },
	{ OV9640_COM4,	OV9640_COM4_QQ_VP | OV9640_COM4_RSVD },
	{ OV9640_COM7,	OV9640_COM7_QCIF },
	{ OV9640_COM12,	OV9640_COM12_RSVD },
	{ OV9640_COM13,	OV9640_COM13_GAMMA_RAW | OV9640_COM13_MATRIX_EN },
	{ OV9640_COM15,	OV9640_COM15_OR_10F0 },
};

static const struct ov9640_reg ov9640_regs_qvga[] = {
	{ OV9640_CLKRC,	OV9640_CLKRC_DPLL_EN | OV9640_CLKRC_DIV(0x03) },
	{ OV9640_COM4,	OV9640_COM4_QQ_VP | OV9640_COM4_RSVD },
	{ OV9640_COM7,	OV9640_COM7_QVGA },
	{ OV9640_COM12,	OV9640_COM12_RSVD },
	{ OV9640_COM13,	OV9640_COM13_GAMMA_RAW | OV9640_COM13_MATRIX_EN },
	{ OV9640_COM15,	OV9640_COM15_OR_10F0 },
};

static const struct ov9640_reg ov9640_regs_cif[] = {
	{ OV9640_CLKRC,	OV9640_CLKRC_DPLL_EN | OV9640_CLKRC_DIV(0x03) },
	{ OV9640_COM3,	OV9640_COM3_VP },
	{ OV9640_COM7,	OV9640_COM7_CIF },
	{ OV9640_COM12,	OV9640_COM12_RSVD },
	{ OV9640_COM13,	OV9640_COM13_GAMMA_RAW | OV9640_COM13_MATRIX_EN },
	{ OV9640_COM15,	OV9640_COM15_OR_10F0 },
};

static const struct ov9640_reg ov9640_regs_vga[] = {
	{ OV9640_CLKRC,	OV9640_CLKRC_DPLL_EN | OV9640_CLKRC_DIV(0x01) },
	{ OV9640_COM3,	OV9640_COM3_VP },
	{ OV9640_COM7,	OV9640_COM7_VGA },
	{ OV9640_COM12,	OV9640_COM12_RSVD },
	{ OV9640_COM13,	OV9640_COM13_GAMMA_RAW | OV9640_COM13_MATRIX_EN },
	{ OV9640_COM15,	OV9640_COM15_OR_10F0 },
};

static const struct ov9640_reg ov9640_regs_sxga[] = {
	{ OV9640_CLKRC,	OV9640_CLKRC_DPLL_EN | OV9640_CLKRC_DIV(0x01) },
	{ OV9640_COM3,	OV9640_COM3_VP },
	{ OV9640_COM7,	0 },
	{ OV9640_COM12,	OV9640_COM12_RSVD },
	{ OV9640_COM13,	OV9640_COM13_GAMMA_RAW | OV9640_COM13_MATRIX_EN },
	{ OV9640_COM15,	OV9640_COM15_OR_10F0 },
};

static const struct ov9640_reg ov9640_regs_yuv[] = {
	{ OV9640_MTX1,	0x58 },
	{ OV9640_MTX2,	0x48 },
	{ OV9640_MTX3,	0x10 },
	{ OV9640_MTX4,	0x28 },
	{ OV9640_MTX5,	0x48 },
	{ OV9640_MTX6,	0x70 },
	{ OV9640_MTX7,	0x40 },
	{ OV9640_MTX8,	0x40 },
	{ OV9640_MTX9,	0x40 },
	{ OV9640_MTXS,	0x0f },
};

static const struct ov9640_reg ov9640_regs_rgb[] = {
	{ OV9640_MTX1,	0x71 },
	{ OV9640_MTX2,	0x3e },
	{ OV9640_MTX3,	0x0c },
	{ OV9640_MTX4,	0x33 },
	{ OV9640_MTX5,	0x72 },
	{ OV9640_MTX6,	0x00 },
	{ OV9640_MTX7,	0x2b },
	{ OV9640_MTX8,	0x66 },
	{ OV9640_MTX9,	0xd2 },
	{ OV9640_MTXS,	0x65 },
};

static u32 ov9640_codes[] = {
	MEDIA_BUS_FMT_UYVY8_2X8,
	MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE,
	MEDIA_BUS_FMT_RGB565_2X8_LE,
};

/* read a register */
static int ov9640_reg_read(struct i2c_client *client, u8 reg, u8 *val)
{
	int ret;
	u8 data = reg;
	struct i2c_msg msg = {
		.addr	= client->addr,
		.flags	= 0,
		.len	= 1,
		.buf	= &data,
	};

	ret = i2c_transfer(client->adapter, &msg, 1);
	if (ret < 0)
		goto err;

	msg.flags = I2C_M_RD;
	ret = i2c_transfer(client->adapter, &msg, 1);
	if (ret < 0)
		goto err;

	*val = data;
	return 0;

err:
	dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
	return ret;
}

/* write a register */
static int ov9640_reg_write(struct i2c_client *client, u8 reg, u8 val)
{
	int ret;
	u8 _val;
	unsigned char data[2] = { reg, val };
	struct i2c_msg msg = {
		.addr	= client->addr,
		.flags	= 0,
		.len	= 2,
		.buf	= data,
	};

	ret = i2c_transfer(client->adapter, &msg, 1);
	if (ret < 0) {
		dev_err(&client->dev, "Failed writing register 0x%02x!\n", reg);
		return ret;
	}

	/* we have to read the register back ... no idea why, maybe HW bug */
	ret = ov9640_reg_read(client, reg, &_val);
	if (ret)
		dev_err(&client->dev,
			"Failed reading back register 0x%02x!\n", reg);

	return 0;
}


/* Read a register, alter its bits, write it back */
static int ov9640_reg_rmw(struct i2c_client *client, u8 reg, u8 set, u8 unset)
{
	u8 val;
	int ret;

	ret = ov9640_reg_read(client, reg, &val);
	if (ret) {
		dev_err(&client->dev,
			"[Read]-Modify-Write of register %02x failed!\n", reg);
		return ret;
	}

	val |= set;
	val &= ~unset;

	ret = ov9640_reg_write(client, reg, val);
	if (ret)
		dev_err(&client->dev,
			"Read-Modify-[Write] of register %02x failed!\n", reg);

	return ret;
}

/* Soft reset the camera. This has nothing to do with the RESET pin! */
static int ov9640_reset(struct i2c_client *client)
{
	int ret;

	ret = ov9640_reg_write(client, OV9640_COM7, OV9640_COM7_SCCB_RESET);
	if (ret)
		dev_err(&client->dev,
			"An error occurred while entering soft reset!\n");

	return ret;
}

/* Start/Stop streaming from the device */
static int ov9640_s_stream(struct v4l2_subdev *sd, int enable)
{
	return 0;
}

/* Set status of additional camera capabilities */
static int ov9640_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct ov9640_priv *priv = container_of(ctrl->handler, struct ov9640_priv, hdl);
	struct i2c_client *client = v4l2_get_subdevdata(&priv->subdev);

	switch (ctrl->id) {
	case V4L2_CID_VFLIP:
		if (ctrl->val)
			return ov9640_reg_rmw(client, OV9640_MVFP,
							OV9640_MVFP_V, 0);
		return ov9640_reg_rmw(client, OV9640_MVFP, 0, OV9640_MVFP_V);
	case V4L2_CID_HFLIP:
		if (ctrl->val)
			return ov9640_reg_rmw(client, OV9640_MVFP,
							OV9640_MVFP_H, 0);
		return ov9640_reg_rmw(client, OV9640_MVFP, 0, OV9640_MVFP_H);
	}
	return -EINVAL;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int ov9640_get_register(struct v4l2_subdev *sd,
				struct v4l2_dbg_register *reg)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int ret;
	u8 val;

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

	reg->size = 1;

	ret = ov9640_reg_read(client, reg->reg, &val);
	if (ret)
		return ret;

	reg->val = (__u64)val;

	return 0;
}

static int ov9640_set_register(struct v4l2_subdev *sd,
				const struct v4l2_dbg_register *reg)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (reg->reg & ~0xff || reg->val & ~0xff)
		return -EINVAL;

	return ov9640_reg_write(client, reg->reg, reg->val);
}
#endif

static int ov9640_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 ov9640_priv *priv = to_ov9640_sensor(sd);

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

/* select nearest higher resolution for capture */
static void ov9640_res_roundup(u32 *width, u32 *height)
{
	int i;
	enum { QQCIF, QQVGA, QCIF, QVGA, CIF, VGA, SXGA };
	static const int res_x[] = { 88, 160, 176, 320, 352, 640, 1280 };
	static const int res_y[] = { 72, 120, 144, 240, 288, 480, 960 };

	for (i = 0; i < ARRAY_SIZE(res_x); i++) {
		if (res_x[i] >= *width && res_y[i] >= *height) {
			*width = res_x[i];
			*height = res_y[i];
			return;
		}
	}

	*width = res_x[SXGA];
	*height = res_y[SXGA];
}

/* Prepare necessary register changes depending on color encoding */
static void ov9640_alter_regs(u32 code,
			      struct ov9640_reg_alt *alt)
{
	switch (code) {
	default:
	case MEDIA_BUS_FMT_UYVY8_2X8:
		alt->com12	= OV9640_COM12_YUV_AVG;
		alt->com13	= OV9640_COM13_Y_DELAY_EN |
					OV9640_COM13_YUV_DLY(0x01);
		break;
	case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
		alt->com7	= OV9640_COM7_RGB;
		alt->com13	= OV9640_COM13_RGB_AVG;
		alt->com15	= OV9640_COM15_RGB_555;
		break;
	case MEDIA_BUS_FMT_RGB565_2X8_LE:
		alt->com7	= OV9640_COM7_RGB;
		alt->com13	= OV9640_COM13_RGB_AVG;
		alt->com15	= OV9640_COM15_RGB_565;
		break;
	}
}

/* Setup registers according to resolution and color encoding */
static int ov9640_write_regs(struct i2c_client *client, u32 width,
		u32 code, struct ov9640_reg_alt *alts)
{
	const struct ov9640_reg	*ov9640_regs, *matrix_regs;
	int			ov9640_regs_len, matrix_regs_len;
	int			i, ret;
	u8			val;

	/* select register configuration for given resolution */
	switch (width) {
	case W_QQCIF:
		ov9640_regs	= ov9640_regs_qqcif;
		ov9640_regs_len	= ARRAY_SIZE(ov9640_regs_qqcif);
		break;
	case W_QQVGA:
		ov9640_regs	= ov9640_regs_qqvga;
		ov9640_regs_len	= ARRAY_SIZE(ov9640_regs_qqvga);
		break;
	case W_QCIF:
		ov9640_regs	= ov9640_regs_qcif;
		ov9640_regs_len	= ARRAY_SIZE(ov9640_regs_qcif);
		break;
	case W_QVGA:
		ov9640_regs	= ov9640_regs_qvga;
		ov9640_regs_len	= ARRAY_SIZE(ov9640_regs_qvga);
		break;
	case W_CIF:
		ov9640_regs	= ov9640_regs_cif;
		ov9640_regs_len	= ARRAY_SIZE(ov9640_regs_cif);
		break;
	case W_VGA:
		ov9640_regs	= ov9640_regs_vga;
		ov9640_regs_len	= ARRAY_SIZE(ov9640_regs_vga);
		break;
	case W_SXGA:
		ov9640_regs	= ov9640_regs_sxga;
		ov9640_regs_len	= ARRAY_SIZE(ov9640_regs_sxga);
		break;
	default:
		dev_err(&client->dev, "Failed to select resolution!\n");
		return -EINVAL;
	}

	/* select color matrix configuration for given color encoding */
	if (code == MEDIA_BUS_FMT_UYVY8_2X8) {
		matrix_regs	= ov9640_regs_yuv;
		matrix_regs_len	= ARRAY_SIZE(ov9640_regs_yuv);
	} else {
		matrix_regs	= ov9640_regs_rgb;
		matrix_regs_len	= ARRAY_SIZE(ov9640_regs_rgb);
	}

	/* write register settings into the module */
	for (i = 0; i < ov9640_regs_len; i++) {
		val = ov9640_regs[i].val;

		switch (ov9640_regs[i].reg) {
		case OV9640_COM7:
			val |= alts->com7;
			break;
		case OV9640_COM12:
			val |= alts->com12;
			break;
		case OV9640_COM13:
			val |= alts->com13;
			break;
		case OV9640_COM15:
			val |= alts->com15;
			break;
		}

		ret = ov9640_reg_write(client, ov9640_regs[i].reg, val);
		if (ret)
			return ret;
	}

	/* write color matrix configuration into the module */
	for (i = 0; i < matrix_regs_len; i++) {
		ret = ov9640_reg_write(client, matrix_regs[i].reg,
						matrix_regs[i].val);
		if (ret)
			return ret;
	}

	return 0;
}

/* program default register values */
static int ov9640_prog_dflt(struct i2c_client *client)
{
	int i, ret;

	for (i = 0; i < ARRAY_SIZE(ov9640_regs_dflt); i++) {
		ret = ov9640_reg_write(client, ov9640_regs_dflt[i].reg,
						ov9640_regs_dflt[i].val);
		if (ret)
			return ret;
	}

	/* wait for the changes to actually happen, 140ms are not enough yet */
	mdelay(150);

	return 0;
}

/* set the format we will capture in */
static int ov9640_s_fmt(struct v4l2_subdev *sd,
			struct v4l2_mbus_framefmt *mf)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct ov9640_reg_alt alts = {0};
	int ret;

	ov9640_alter_regs(mf->code, &alts);

	ov9640_reset(client);

	ret = ov9640_prog_dflt(client);
	if (ret)
		return ret;

	return ov9640_write_regs(client, mf->width, mf->code, &alts);
}

static int ov9640_set_fmt(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_format *format)
{
	struct v4l2_mbus_framefmt *mf = &format->format;

	if (format->pad)
		return -EINVAL;

	ov9640_res_roundup(&mf->width, &mf->height);

	mf->field = V4L2_FIELD_NONE;

	switch (mf->code) {
	case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
	case MEDIA_BUS_FMT_RGB565_2X8_LE:
		mf->colorspace = V4L2_COLORSPACE_SRGB;
		break;
	default:
		mf->code = MEDIA_BUS_FMT_UYVY8_2X8;
		/* fall through */
	case MEDIA_BUS_FMT_UYVY8_2X8:
		mf->colorspace = V4L2_COLORSPACE_JPEG;
		break;
	}

	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
		return ov9640_s_fmt(sd, mf);

	cfg->try_fmt = *mf;
	return 0;
}

static int ov9640_enum_mbus_code(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_mbus_code_enum *code)
{
	if (code->pad || code->index >= ARRAY_SIZE(ov9640_codes))
		return -EINVAL;

	code->code = ov9640_codes[code->index];
	return 0;
}

static int ov9640_get_selection(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_selection *sel)
{
	if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
		return -EINVAL;

	sel->r.left = 0;
	sel->r.top = 0;
	switch (sel->target) {
	case V4L2_SEL_TGT_CROP_BOUNDS:
	case V4L2_SEL_TGT_CROP_DEFAULT:
	case V4L2_SEL_TGT_CROP:
		sel->r.width = W_SXGA;
		sel->r.height = H_SXGA;
		return 0;
	default:
		return -EINVAL;
	}
}

static int ov9640_video_probe(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov9640_priv *priv = to_ov9640_sensor(sd);
	u8		pid, ver, midh, midl;
	const char	*devname;
	int		ret;

	ret = ov9640_s_power(&priv->subdev, 1);
	if (ret < 0)
		return ret;

	/*
	 * check and show product ID and manufacturer ID
	 */

	ret = ov9640_reg_read(client, OV9640_PID, &pid);
	if (!ret)
		ret = ov9640_reg_read(client, OV9640_VER, &ver);
	if (!ret)
		ret = ov9640_reg_read(client, OV9640_MIDH, &midh);
	if (!ret)
		ret = ov9640_reg_read(client, OV9640_MIDL, &midl);
	if (ret)
		goto done;

	switch (VERSION(pid, ver)) {
	case OV9640_V2:
		devname		= "ov9640";
		priv->revision	= 2;
		break;
	case OV9640_V3:
		devname		= "ov9640";
		priv->revision	= 3;
		break;
	default:
		dev_err(&client->dev, "Product ID error %x:%x\n", pid, ver);
		ret = -ENODEV;
		goto done;
	}

	dev_info(&client->dev, "%s Product ID %0x:%0x Manufacturer ID %x:%x\n",
		 devname, pid, ver, midh, midl);

	ret = v4l2_ctrl_handler_setup(&priv->hdl);

done:
	ov9640_s_power(&priv->subdev, 0);
	return ret;
}

static const struct v4l2_ctrl_ops ov9640_ctrl_ops = {
	.s_ctrl = ov9640_s_ctrl,
};

static const struct v4l2_subdev_core_ops ov9640_core_ops = {
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.g_register		= ov9640_get_register,
	.s_register		= ov9640_set_register,
#endif
	.s_power		= ov9640_s_power,
};

/* Request bus settings on camera side */
static int ov9640_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_PCLK_SAMPLE_RISING | V4L2_MBUS_MASTER |
		V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_HIGH |
		V4L2_MBUS_DATA_ACTIVE_HIGH;
	cfg->type = V4L2_MBUS_PARALLEL;
	cfg->flags = soc_camera_apply_board_flags(ssdd, cfg);

	return 0;
}

static const struct v4l2_subdev_video_ops ov9640_video_ops = {
	.s_stream	= ov9640_s_stream,
	.g_mbus_config	= ov9640_g_mbus_config,
};

static const struct v4l2_subdev_pad_ops ov9640_pad_ops = {
	.enum_mbus_code = ov9640_enum_mbus_code,
	.get_selection	= ov9640_get_selection,
	.set_fmt	= ov9640_set_fmt,
};

static const struct v4l2_subdev_ops ov9640_subdev_ops = {
	.core	= &ov9640_core_ops,
	.video	= &ov9640_video_ops,
	.pad	= &ov9640_pad_ops,
};

/*
 * i2c_driver function
 */
static int ov9640_probe(struct i2c_client *client,
			const struct i2c_device_id *did)
{
	struct ov9640_priv *priv;
	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
	int ret;

	if (!ssdd) {
		dev_err(&client->dev, "Missing platform_data for driver\n");
		return -EINVAL;
	}

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

	v4l2_i2c_subdev_init(&priv->subdev, client, &ov9640_subdev_ops);

	v4l2_ctrl_handler_init(&priv->hdl, 2);
	v4l2_ctrl_new_std(&priv->hdl, &ov9640_ctrl_ops,
			V4L2_CID_VFLIP, 0, 1, 1, 0);
	v4l2_ctrl_new_std(&priv->hdl, &ov9640_ctrl_ops,
			V4L2_CID_HFLIP, 0, 1, 1, 0);
	priv->subdev.ctrl_handler = &priv->hdl;
	if (priv->hdl.error)
		return priv->hdl.error;

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

	ret = ov9640_video_probe(client);
	if (ret) {
		v4l2_clk_put(priv->clk);
eclkget:
		v4l2_ctrl_handler_free(&priv->hdl);
	}

	return ret;
}

static int ov9640_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov9640_priv *priv = to_ov9640_sensor(sd);

	v4l2_clk_put(priv->clk);
	v4l2_device_unregister_subdev(&priv->subdev);
	v4l2_ctrl_handler_free(&priv->hdl);
	return 0;
}

static const struct i2c_device_id ov9640_id[] = {
	{ "ov9640", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ov9640_id);

static struct i2c_driver ov9640_i2c_driver = {
	.driver = {
		.name = "ov9640",
	},
	.probe    = ov9640_probe,
	.remove   = ov9640_remove,
	.id_table = ov9640_id,
};

module_i2c_driver(ov9640_i2c_driver);

MODULE_DESCRIPTION("SoC Camera driver for OmniVision OV96xx");
MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_LICENSE("GPL v2");