summaryrefslogtreecommitdiff
path: root/drivers/media/i2c/sr030pc30.c
blob: 2a4882cddc51950a4dabf8aa2a99784904d9d1cf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
/*
 * Driver for SiliconFile SR030PC30 VGA (1/10-Inch) Image Sensor with ISP
 *
 * Copyright (C) 2010 Samsung Electronics Co., Ltd
 * Author: Sylwester Nawrocki, s.nawrocki@samsung.com
 *
 * Based on original driver authored by Dongsoo Nathaniel Kim
 * and HeungJun Kim <riverful.kim@samsung.com>.
 *
 * Based on mt9v011 Micron Digital Image Sensor driver
 * Copyright (c) 2009 Mauro Carvalho Chehab
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
#include <media/v4l2-mediabus.h>
#include <media/v4l2-ctrls.h>
#include <media/i2c/sr030pc30.h>

static int debug;
module_param(debug, int, 0644);

#define MODULE_NAME	"SR030PC30"

/*
 * Register offsets within a page
 * b15..b8 - page id, b7..b0 - register address
 */
#define POWER_CTRL_REG		0x0001
#define PAGEMODE_REG		0x03
#define DEVICE_ID_REG		0x0004
#define NOON010PC30_ID		0x86
#define SR030PC30_ID		0x8C
#define VDO_CTL1_REG		0x0010
#define SUBSAMPL_NONE_VGA	0
#define SUBSAMPL_QVGA		0x10
#define SUBSAMPL_QQVGA		0x20
#define VDO_CTL2_REG		0x0011
#define SYNC_CTL_REG		0x0012
#define WIN_ROWH_REG		0x0020
#define WIN_ROWL_REG		0x0021
#define WIN_COLH_REG		0x0022
#define WIN_COLL_REG		0x0023
#define WIN_HEIGHTH_REG		0x0024
#define WIN_HEIGHTL_REG		0x0025
#define WIN_WIDTHH_REG		0x0026
#define WIN_WIDTHL_REG		0x0027
#define HBLANKH_REG		0x0040
#define HBLANKL_REG		0x0041
#define VSYNCH_REG		0x0042
#define VSYNCL_REG		0x0043
/* page 10 */
#define ISP_CTL_REG(n)		(0x1010 + (n))
#define YOFS_REG		0x1040
#define DARK_YOFS_REG		0x1041
#define AG_ABRTH_REG		0x1050
#define SAT_CTL_REG		0x1060
#define BSAT_REG		0x1061
#define RSAT_REG		0x1062
#define AG_SAT_TH_REG		0x1063
/* page 11 */
#define ZLPF_CTRL_REG		0x1110
#define ZLPF_CTRL2_REG		0x1112
#define ZLPF_AGH_THR_REG	0x1121
#define ZLPF_THR_REG		0x1160
#define ZLPF_DYN_THR_REG	0x1160
/* page 12 */
#define YCLPF_CTL1_REG		0x1240
#define YCLPF_CTL2_REG		0x1241
#define YCLPF_THR_REG		0x1250
#define BLPF_CTL_REG		0x1270
#define BLPF_THR1_REG		0x1274
#define BLPF_THR2_REG		0x1275
/* page 14 - Lens Shading Compensation */
#define LENS_CTRL_REG		0x1410
#define LENS_XCEN_REG		0x1420
#define LENS_YCEN_REG		0x1421
#define LENS_R_COMP_REG		0x1422
#define LENS_G_COMP_REG		0x1423
#define LENS_B_COMP_REG		0x1424
/* page 15 - Color correction */
#define CMC_CTL_REG		0x1510
#define CMC_OFSGH_REG		0x1514
#define CMC_OFSGL_REG		0x1516
#define CMC_SIGN_REG		0x1517
/* Color correction coefficients */
#define CMC_COEF_REG(n)		(0x1530 + (n))
/* Color correction offset coefficients */
#define CMC_OFS_REG(n)		(0x1540 + (n))
/* page 16 - Gamma correction */
#define GMA_CTL_REG		0x1610
/* Gamma correction coefficients 0.14 */
#define GMA_COEF_REG(n)		(0x1630 + (n))
/* page 20 - Auto Exposure */
#define AE_CTL1_REG		0x2010
#define AE_CTL2_REG		0x2011
#define AE_FRM_CTL_REG		0x2020
#define AE_FINE_CTL_REG(n)	(0x2028 + (n))
#define EXP_TIMEH_REG		0x2083
#define EXP_TIMEM_REG		0x2084
#define EXP_TIMEL_REG		0x2085
#define EXP_MMINH_REG		0x2086
#define EXP_MMINL_REG		0x2087
#define EXP_MMAXH_REG		0x2088
#define EXP_MMAXM_REG		0x2089
#define EXP_MMAXL_REG		0x208A
/* page 22 - Auto White Balance */
#define AWB_CTL1_REG		0x2210
#define AWB_ENABLE		0x80
#define AWB_CTL2_REG		0x2211
#define MWB_ENABLE		0x01
/* RGB gain control (manual WB) when AWB_CTL1[7]=0 */
#define AWB_RGAIN_REG		0x2280
#define AWB_GGAIN_REG		0x2281
#define AWB_BGAIN_REG		0x2282
#define AWB_RMAX_REG		0x2283
#define AWB_RMIN_REG		0x2284
#define AWB_BMAX_REG		0x2285
#define AWB_BMIN_REG		0x2286
/* R, B gain range in bright light conditions */
#define AWB_RMAXB_REG		0x2287
#define AWB_RMINB_REG		0x2288
#define AWB_BMAXB_REG		0x2289
#define AWB_BMINB_REG		0x228A
/* manual white balance, when AWB_CTL2[0]=1 */
#define MWB_RGAIN_REG		0x22B2
#define MWB_BGAIN_REG		0x22B3
/* the token to mark an array end */
#define REG_TERM		0xFFFF

/* Minimum and maximum exposure time in ms */
#define EXPOS_MIN_MS		1
#define EXPOS_MAX_MS		125

struct sr030pc30_info {
	struct v4l2_subdev sd;
	struct v4l2_ctrl_handler hdl;
	const struct sr030pc30_platform_data *pdata;
	const struct sr030pc30_format *curr_fmt;
	const struct sr030pc30_frmsize *curr_win;
	unsigned int hflip:1;
	unsigned int vflip:1;
	unsigned int sleep:1;
	struct {
		/* auto whitebalance control cluster */
		struct v4l2_ctrl *awb;
		struct v4l2_ctrl *red;
		struct v4l2_ctrl *blue;
	};
	struct {
		/* auto exposure control cluster */
		struct v4l2_ctrl *autoexp;
		struct v4l2_ctrl *exp;
	};
	u8 i2c_reg_page;
};

struct sr030pc30_format {
	u32 code;
	enum v4l2_colorspace colorspace;
	u16 ispctl1_reg;
};

struct sr030pc30_frmsize {
	u16 width;
	u16 height;
	int vid_ctl1;
};

struct i2c_regval {
	u16 addr;
	u16 val;
};

/* supported resolutions */
static const struct sr030pc30_frmsize sr030pc30_sizes[] = {
	{
		.width		= 640,
		.height		= 480,
		.vid_ctl1	= SUBSAMPL_NONE_VGA,
	}, {
		.width		= 320,
		.height		= 240,
		.vid_ctl1	= SUBSAMPL_QVGA,
	}, {
		.width		= 160,
		.height		= 120,
		.vid_ctl1	= SUBSAMPL_QQVGA,
	},
};

/* supported pixel formats */
static const struct sr030pc30_format sr030pc30_formats[] = {
	{
		.code		= MEDIA_BUS_FMT_YUYV8_2X8,
		.colorspace	= V4L2_COLORSPACE_JPEG,
		.ispctl1_reg	= 0x03,
	}, {
		.code		= MEDIA_BUS_FMT_YVYU8_2X8,
		.colorspace	= V4L2_COLORSPACE_JPEG,
		.ispctl1_reg	= 0x02,
	}, {
		.code		= MEDIA_BUS_FMT_VYUY8_2X8,
		.colorspace	= V4L2_COLORSPACE_JPEG,
		.ispctl1_reg	= 0,
	}, {
		.code		= MEDIA_BUS_FMT_UYVY8_2X8,
		.colorspace	= V4L2_COLORSPACE_JPEG,
		.ispctl1_reg	= 0x01,
	}, {
		.code		= MEDIA_BUS_FMT_RGB565_2X8_BE,
		.colorspace	= V4L2_COLORSPACE_JPEG,
		.ispctl1_reg	= 0x40,
	},
};

static const struct i2c_regval sr030pc30_base_regs[] = {
	/* Window size and position within pixel matrix */
	{ WIN_ROWH_REG,		0x00 }, { WIN_ROWL_REG,		0x06 },
	{ WIN_COLH_REG,		0x00 },	{ WIN_COLL_REG,		0x06 },
	{ WIN_HEIGHTH_REG,	0x01 }, { WIN_HEIGHTL_REG,	0xE0 },
	{ WIN_WIDTHH_REG,	0x02 }, { WIN_WIDTHL_REG,	0x80 },
	{ HBLANKH_REG,		0x01 }, { HBLANKL_REG,		0x50 },
	{ VSYNCH_REG,		0x00 }, { VSYNCL_REG,		0x14 },
	{ SYNC_CTL_REG,		0 },
	/* Color corection and saturation */
	{ ISP_CTL_REG(0),	0x30 }, { YOFS_REG,		0x80 },
	{ DARK_YOFS_REG,	0x04 }, { AG_ABRTH_REG,		0x78 },
	{ SAT_CTL_REG,		0x1F }, { BSAT_REG,		0x90 },
	{ AG_SAT_TH_REG,	0xF0 }, { 0x1064,		0x80 },
	{ CMC_CTL_REG,		0x03 }, { CMC_OFSGH_REG,	0x3C },
	{ CMC_OFSGL_REG,	0x2C }, { CMC_SIGN_REG,		0x2F },
	{ CMC_COEF_REG(0),	0xCB }, { CMC_OFS_REG(0),	0x87 },
	{ CMC_COEF_REG(1),	0x61 }, { CMC_OFS_REG(1),	0x18 },
	{ CMC_COEF_REG(2),	0x16 }, { CMC_OFS_REG(2),	0x91 },
	{ CMC_COEF_REG(3),	0x23 }, { CMC_OFS_REG(3),	0x94 },
	{ CMC_COEF_REG(4),	0xCE }, { CMC_OFS_REG(4),	0x9f },
	{ CMC_COEF_REG(5),	0x2B }, { CMC_OFS_REG(5),	0x33 },
	{ CMC_COEF_REG(6),	0x01 }, { CMC_OFS_REG(6),	0x00 },
	{ CMC_COEF_REG(7),	0x34 }, { CMC_OFS_REG(7),	0x94 },
	{ CMC_COEF_REG(8),	0x75 }, { CMC_OFS_REG(8),	0x14 },
	/* Color corection coefficients */
	{ GMA_CTL_REG,		0x03 },	{ GMA_COEF_REG(0),	0x00 },
	{ GMA_COEF_REG(1),	0x19 },	{ GMA_COEF_REG(2),	0x26 },
	{ GMA_COEF_REG(3),	0x3B },	{ GMA_COEF_REG(4),	0x5D },
	{ GMA_COEF_REG(5),	0x79 }, { GMA_COEF_REG(6),	0x8E },
	{ GMA_COEF_REG(7),	0x9F },	{ GMA_COEF_REG(8),	0xAF },
	{ GMA_COEF_REG(9),	0xBD },	{ GMA_COEF_REG(10),	0xCA },
	{ GMA_COEF_REG(11),	0xDD }, { GMA_COEF_REG(12),	0xEC },
	{ GMA_COEF_REG(13),	0xF7 },	{ GMA_COEF_REG(14),	0xFF },
	/* Noise reduction, Z-LPF, YC-LPF and BLPF filters setup */
	{ ZLPF_CTRL_REG,	0x99 }, { ZLPF_CTRL2_REG,	0x0E },
	{ ZLPF_AGH_THR_REG,	0x29 }, { ZLPF_THR_REG,		0x0F },
	{ ZLPF_DYN_THR_REG,	0x63 }, { YCLPF_CTL1_REG,	0x23 },
	{ YCLPF_CTL2_REG,	0x3B }, { YCLPF_THR_REG,	0x05 },
	{ BLPF_CTL_REG,		0x1D }, { BLPF_THR1_REG,	0x05 },
	{ BLPF_THR2_REG,	0x04 },
	/* Automatic white balance */
	{ AWB_CTL1_REG,		0xFB }, { AWB_CTL2_REG,		0x26 },
	{ AWB_RMAX_REG,		0x54 }, { AWB_RMIN_REG,		0x2B },
	{ AWB_BMAX_REG,		0x57 }, { AWB_BMIN_REG,		0x29 },
	{ AWB_RMAXB_REG,	0x50 }, { AWB_RMINB_REG,	0x43 },
	{ AWB_BMAXB_REG,	0x30 }, { AWB_BMINB_REG,	0x22 },
	/* Auto exposure */
	{ AE_CTL1_REG,		0x8C }, { AE_CTL2_REG,		0x04 },
	{ AE_FRM_CTL_REG,	0x01 }, { AE_FINE_CTL_REG(0),	0x3F },
	{ AE_FINE_CTL_REG(1),	0xA3 }, { AE_FINE_CTL_REG(3),	0x34 },
	/* Lens shading compensation */
	{ LENS_CTRL_REG,	0x01 }, { LENS_XCEN_REG,	0x80 },
	{ LENS_YCEN_REG,	0x70 }, { LENS_R_COMP_REG,	0x53 },
	{ LENS_G_COMP_REG,	0x40 }, { LENS_B_COMP_REG,	0x3e },
	{ REG_TERM,		0 },
};

static inline struct sr030pc30_info *to_sr030pc30(struct v4l2_subdev *sd)
{
	return container_of(sd, struct sr030pc30_info, sd);
}

static inline int set_i2c_page(struct sr030pc30_info *info,
			       struct i2c_client *client, unsigned int reg)
{
	int ret = 0;
	u32 page = reg >> 8 & 0xFF;

	if (info->i2c_reg_page != page && (reg & 0xFF) != 0x03) {
		ret = i2c_smbus_write_byte_data(client, PAGEMODE_REG, page);
		if (!ret)
			info->i2c_reg_page = page;
	}
	return ret;
}

static int cam_i2c_read(struct v4l2_subdev *sd, u32 reg_addr)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct sr030pc30_info *info = to_sr030pc30(sd);

	int ret = set_i2c_page(info, client, reg_addr);
	if (!ret)
		ret = i2c_smbus_read_byte_data(client, reg_addr & 0xFF);
	return ret;
}

static int cam_i2c_write(struct v4l2_subdev *sd, u32 reg_addr, u32 val)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct sr030pc30_info *info = to_sr030pc30(sd);

	int ret = set_i2c_page(info, client, reg_addr);
	if (!ret)
		ret = i2c_smbus_write_byte_data(
			client, reg_addr & 0xFF, val);
	return ret;
}

static inline int sr030pc30_bulk_write_reg(struct v4l2_subdev *sd,
				const struct i2c_regval *msg)
{
	while (msg->addr != REG_TERM) {
		int ret = cam_i2c_write(sd, msg->addr, msg->val);
		if (ret)
			return ret;
		msg++;
	}
	return 0;
}

/* Device reset and sleep mode control */
static int sr030pc30_pwr_ctrl(struct v4l2_subdev *sd,
				     bool reset, bool sleep)
{
	struct sr030pc30_info *info = to_sr030pc30(sd);
	u8 reg = sleep ? 0xF1 : 0xF0;
	int ret = 0;

	if (reset)
		ret = cam_i2c_write(sd, POWER_CTRL_REG, reg | 0x02);
	if (!ret) {
		ret = cam_i2c_write(sd, POWER_CTRL_REG, reg);
		if (!ret) {
			info->sleep = sleep;
			if (reset)
				info->i2c_reg_page = -1;
		}
	}
	return ret;
}

static int sr030pc30_set_flip(struct v4l2_subdev *sd)
{
	struct sr030pc30_info *info = to_sr030pc30(sd);

	s32 reg = cam_i2c_read(sd, VDO_CTL2_REG);
	if (reg < 0)
		return reg;

	reg &= 0x7C;
	if (info->hflip)
		reg |= 0x01;
	if (info->vflip)
		reg |= 0x02;
	return cam_i2c_write(sd, VDO_CTL2_REG, reg | 0x80);
}

/* Configure resolution, color format and image flip */
static int sr030pc30_set_params(struct v4l2_subdev *sd)
{
	struct sr030pc30_info *info = to_sr030pc30(sd);
	int ret;

	if (!info->curr_win)
		return -EINVAL;

	/* Configure the resolution through subsampling */
	ret = cam_i2c_write(sd, VDO_CTL1_REG,
			    info->curr_win->vid_ctl1);

	if (!ret && info->curr_fmt)
		ret = cam_i2c_write(sd, ISP_CTL_REG(0),
				info->curr_fmt->ispctl1_reg);
	if (!ret)
		ret = sr030pc30_set_flip(sd);

	return ret;
}

/* Find nearest matching image pixel size. */
static int sr030pc30_try_frame_size(struct v4l2_mbus_framefmt *mf)
{
	unsigned int min_err = ~0;
	int i = ARRAY_SIZE(sr030pc30_sizes);
	const struct sr030pc30_frmsize *fsize = &sr030pc30_sizes[0],
					*match = NULL;
	while (i--) {
		int err = abs(fsize->width - mf->width)
				+ abs(fsize->height - mf->height);
		if (err < min_err) {
			min_err = err;
			match = fsize;
		}
		fsize++;
	}
	if (match) {
		mf->width  = match->width;
		mf->height = match->height;
		return 0;
	}
	return -EINVAL;
}

static int sr030pc30_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct sr030pc30_info *info =
		container_of(ctrl->handler, struct sr030pc30_info, hdl);
	struct v4l2_subdev *sd = &info->sd;
	int ret = 0;

	v4l2_dbg(1, debug, sd, "%s: ctrl_id: %d, value: %d\n",
			 __func__, ctrl->id, ctrl->val);

	switch (ctrl->id) {
	case V4L2_CID_AUTO_WHITE_BALANCE:
		if (ctrl->is_new) {
			ret = cam_i2c_write(sd, AWB_CTL2_REG,
					ctrl->val ? 0x2E : 0x2F);
			if (!ret)
				ret = cam_i2c_write(sd, AWB_CTL1_REG,
						ctrl->val ? 0xFB : 0x7B);
		}
		if (!ret && info->blue->is_new)
			ret = cam_i2c_write(sd, MWB_BGAIN_REG, info->blue->val);
		if (!ret && info->red->is_new)
			ret = cam_i2c_write(sd, MWB_RGAIN_REG, info->red->val);
		return ret;

	case V4L2_CID_EXPOSURE_AUTO:
		/* auto anti-flicker is also enabled here */
		if (ctrl->is_new)
			ret = cam_i2c_write(sd, AE_CTL1_REG,
				ctrl->val == V4L2_EXPOSURE_AUTO ? 0xDC : 0x0C);
		if (info->exp->is_new) {
			unsigned long expos = info->exp->val;

			expos = expos * info->pdata->clk_rate / (8 * 1000);

			if (!ret)
				ret = cam_i2c_write(sd, EXP_TIMEH_REG,
						expos >> 16 & 0xFF);
			if (!ret)
				ret = cam_i2c_write(sd, EXP_TIMEM_REG,
						expos >> 8 & 0xFF);
			if (!ret)
				ret = cam_i2c_write(sd, EXP_TIMEL_REG,
						expos & 0xFF);
		}
		return ret;
	default:
		return -EINVAL;
	}

	return 0;
}

static int sr030pc30_enum_mbus_code(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_mbus_code_enum *code)
{
	if (!code || code->pad ||
	    code->index >= ARRAY_SIZE(sr030pc30_formats))
		return -EINVAL;

	code->code = sr030pc30_formats[code->index].code;
	return 0;
}

static int sr030pc30_get_fmt(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_format *format)
{
	struct v4l2_mbus_framefmt *mf;
	struct sr030pc30_info *info = to_sr030pc30(sd);

	if (!format || format->pad)
		return -EINVAL;

	mf = &format->format;

	if (!info->curr_win || !info->curr_fmt)
		return -EINVAL;

	mf->width	= info->curr_win->width;
	mf->height	= info->curr_win->height;
	mf->code	= info->curr_fmt->code;
	mf->colorspace	= info->curr_fmt->colorspace;
	mf->field	= V4L2_FIELD_NONE;

	return 0;
}

/* Return nearest media bus frame format. */
static const struct sr030pc30_format *try_fmt(struct v4l2_subdev *sd,
					      struct v4l2_mbus_framefmt *mf)
{
	int i;

	sr030pc30_try_frame_size(mf);

	for (i = 0; i < ARRAY_SIZE(sr030pc30_formats); i++) {
		if (mf->code == sr030pc30_formats[i].code)
			break;
	}
	if (i == ARRAY_SIZE(sr030pc30_formats))
		i = 0;

	mf->code = sr030pc30_formats[i].code;

	return &sr030pc30_formats[i];
}

/* Return nearest media bus frame format. */
static int sr030pc30_set_fmt(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_format *format)
{
	struct sr030pc30_info *info = sd ? to_sr030pc30(sd) : NULL;
	const struct sr030pc30_format *fmt;
	struct v4l2_mbus_framefmt *mf;

	if (!sd || !format)
		return -EINVAL;

	mf = &format->format;
	if (format->pad)
		return -EINVAL;

	fmt = try_fmt(sd, mf);
	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
		cfg->try_fmt = *mf;
		return 0;
	}

	info->curr_fmt = fmt;

	return sr030pc30_set_params(sd);
}

static int sr030pc30_base_config(struct v4l2_subdev *sd)
{
	struct sr030pc30_info *info = to_sr030pc30(sd);
	int ret;
	unsigned long expmin, expmax;

	ret = sr030pc30_bulk_write_reg(sd, sr030pc30_base_regs);
	if (!ret) {
		info->curr_fmt = &sr030pc30_formats[0];
		info->curr_win = &sr030pc30_sizes[0];
		ret = sr030pc30_set_params(sd);
	}
	if (!ret)
		ret = sr030pc30_pwr_ctrl(sd, false, false);

	if (!ret && !info->pdata)
		return ret;

	expmin = EXPOS_MIN_MS * info->pdata->clk_rate / (8 * 1000);
	expmax = EXPOS_MAX_MS * info->pdata->clk_rate / (8 * 1000);

	v4l2_dbg(1, debug, sd, "%s: expmin= %lx, expmax= %lx", __func__,
		 expmin, expmax);

	/* Setting up manual exposure time range */
	ret = cam_i2c_write(sd, EXP_MMINH_REG, expmin >> 8 & 0xFF);
	if (!ret)
		ret = cam_i2c_write(sd, EXP_MMINL_REG, expmin & 0xFF);
	if (!ret)
		ret = cam_i2c_write(sd, EXP_MMAXH_REG, expmax >> 16 & 0xFF);
	if (!ret)
		ret = cam_i2c_write(sd, EXP_MMAXM_REG, expmax >> 8 & 0xFF);
	if (!ret)
		ret = cam_i2c_write(sd, EXP_MMAXL_REG, expmax & 0xFF);

	return ret;
}

static int sr030pc30_s_power(struct v4l2_subdev *sd, int on)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct sr030pc30_info *info = to_sr030pc30(sd);
	const struct sr030pc30_platform_data *pdata = info->pdata;
	int ret;

	if (pdata == NULL) {
		WARN(1, "No platform data!\n");
		return -EINVAL;
	}

	/*
	 * Put sensor into power sleep mode before switching off
	 * power and disabling MCLK.
	 */
	if (!on)
		sr030pc30_pwr_ctrl(sd, false, true);

	/* set_power controls sensor's power and clock */
	if (pdata->set_power) {
		ret = pdata->set_power(&client->dev, on);
		if (ret)
			return ret;
	}

	if (on) {
		ret = sr030pc30_base_config(sd);
	} else {
		ret = 0;
		info->curr_win = NULL;
		info->curr_fmt = NULL;
	}

	return ret;
}

static const struct v4l2_ctrl_ops sr030pc30_ctrl_ops = {
	.s_ctrl = sr030pc30_s_ctrl,
};

static const struct v4l2_subdev_core_ops sr030pc30_core_ops = {
	.s_power	= sr030pc30_s_power,
};

static const struct v4l2_subdev_pad_ops sr030pc30_pad_ops = {
	.enum_mbus_code = sr030pc30_enum_mbus_code,
	.get_fmt	= sr030pc30_get_fmt,
	.set_fmt	= sr030pc30_set_fmt,
};

static const struct v4l2_subdev_ops sr030pc30_ops = {
	.core	= &sr030pc30_core_ops,
	.pad	= &sr030pc30_pad_ops,
};

/*
 * Detect sensor type. Return 0 if SR030PC30 was detected
 * or -ENODEV otherwise.
 */
static int sr030pc30_detect(struct i2c_client *client)
{
	const struct sr030pc30_platform_data *pdata
		= client->dev.platform_data;
	int ret;

	/* Enable sensor's power and clock */
	if (pdata->set_power) {
		ret = pdata->set_power(&client->dev, 1);
		if (ret)
			return ret;
	}

	ret = i2c_smbus_read_byte_data(client, DEVICE_ID_REG);

	if (pdata->set_power)
		pdata->set_power(&client->dev, 0);

	if (ret < 0) {
		dev_err(&client->dev, "%s: I2C read failed\n", __func__);
		return ret;
	}

	return ret == SR030PC30_ID ? 0 : -ENODEV;
}


static int sr030pc30_probe(struct i2c_client *client,
			   const struct i2c_device_id *id)
{
	struct sr030pc30_info *info;
	struct v4l2_subdev *sd;
	struct v4l2_ctrl_handler *hdl;
	const struct sr030pc30_platform_data *pdata
		= client->dev.platform_data;
	int ret;

	if (!pdata) {
		dev_err(&client->dev, "No platform data!");
		return -EIO;
	}

	ret = sr030pc30_detect(client);
	if (ret)
		return ret;

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

	sd = &info->sd;
	strcpy(sd->name, MODULE_NAME);
	info->pdata = client->dev.platform_data;

	v4l2_i2c_subdev_init(sd, client, &sr030pc30_ops);

	hdl = &info->hdl;
	v4l2_ctrl_handler_init(hdl, 6);
	info->awb = v4l2_ctrl_new_std(hdl, &sr030pc30_ctrl_ops,
			V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 1);
	info->red = v4l2_ctrl_new_std(hdl, &sr030pc30_ctrl_ops,
			V4L2_CID_RED_BALANCE, 0, 127, 1, 64);
	info->blue = v4l2_ctrl_new_std(hdl, &sr030pc30_ctrl_ops,
			V4L2_CID_BLUE_BALANCE, 0, 127, 1, 64);
	info->autoexp = v4l2_ctrl_new_std(hdl, &sr030pc30_ctrl_ops,
			V4L2_CID_EXPOSURE_AUTO, 0, 1, 1, 1);
	info->exp = v4l2_ctrl_new_std(hdl, &sr030pc30_ctrl_ops,
			V4L2_CID_EXPOSURE, EXPOS_MIN_MS, EXPOS_MAX_MS, 1, 30);
	sd->ctrl_handler = hdl;
	if (hdl->error) {
		int err = hdl->error;

		v4l2_ctrl_handler_free(hdl);
		return err;
	}
	v4l2_ctrl_auto_cluster(3, &info->awb, 0, false);
	v4l2_ctrl_auto_cluster(2, &info->autoexp, V4L2_EXPOSURE_MANUAL, false);
	v4l2_ctrl_handler_setup(hdl);

	info->i2c_reg_page	= -1;
	info->hflip		= 1;

	return 0;
}

static int sr030pc30_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);

	v4l2_device_unregister_subdev(sd);
	v4l2_ctrl_handler_free(sd->ctrl_handler);
	return 0;
}

static const struct i2c_device_id sr030pc30_id[] = {
	{ MODULE_NAME, 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, sr030pc30_id);


static struct i2c_driver sr030pc30_i2c_driver = {
	.driver = {
		.name = MODULE_NAME
	},
	.probe		= sr030pc30_probe,
	.remove		= sr030pc30_remove,
	.id_table	= sr030pc30_id,
};

module_i2c_driver(sr030pc30_i2c_driver);

MODULE_DESCRIPTION("Siliconfile SR030PC30 camera driver");
MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
MODULE_LICENSE("GPL");