/*
 * 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/videodev2.h>
#include <media/v4l2-chip-ident.h>
#include <media/v4l2-subdev.h>
#include <media/soc_camera.h>
#include <media/ov772x.h>

/*
 * register offset
 */
#define GAIN        0x00 /* AGC - Gain control gain setting */
#define BLUE        0x01 /* AWB - Blue channel gain setting */
#define RED         0x02 /* AWB - Red   channel gain setting */
#define GREEN       0x03 /* AWB - Green channel gain setting */
#define COM1        0x04 /* Common control 1 */
#define BAVG        0x05 /* U/B Average Level */
#define GAVG        0x06 /* Y/Gb Average Level */
#define RAVG        0x07 /* V/R Average Level */
#define AECH        0x08 /* Exposure Value - AEC MSBs */
#define COM2        0x09 /* Common control 2 */
#define PID         0x0A /* Product ID Number MSB */
#define VER         0x0B /* Product ID Number LSB */
#define COM3        0x0C /* Common control 3 */
#define COM4        0x0D /* Common control 4 */
#define COM5        0x0E /* Common control 5 */
#define COM6        0x0F /* Common control 6 */
#define AEC         0x10 /* Exposure Value */
#define CLKRC       0x11 /* Internal clock */
#define COM7        0x12 /* Common control 7 */
#define COM8        0x13 /* Common control 8 */
#define COM9        0x14 /* Common control 9 */
#define COM10       0x15 /* Common control 10 */
#define REG16       0x16 /* Register 16 */
#define HSTART      0x17 /* Horizontal sensor size */
#define HSIZE       0x18 /* Horizontal frame (HREF column) end high 8-bit */
#define VSTART      0x19 /* Vertical frame (row) start high 8-bit */
#define VSIZE       0x1A /* Vertical sensor size */
#define PSHFT       0x1B /* Data format - pixel delay select */
#define MIDH        0x1C /* Manufacturer ID byte - high */
#define MIDL        0x1D /* Manufacturer ID byte - low  */
#define LAEC        0x1F /* Fine AEC value */
#define COM11       0x20 /* Common control 11 */
#define BDBASE      0x22 /* Banding filter Minimum AEC value */
#define DBSTEP      0x23 /* Banding filter Maximum Setp */
#define AEW         0x24 /* AGC/AEC - Stable operating region (upper limit) */
#define AEB         0x25 /* AGC/AEC - Stable operating region (lower limit) */
#define VPT         0x26 /* AGC/AEC Fast mode operating region */
#define REG28       0x28 /* Register 28 */
#define HOUTSIZE    0x29 /* Horizontal data output size MSBs */
#define EXHCH       0x2A /* Dummy pixel insert MSB */
#define EXHCL       0x2B /* Dummy pixel insert LSB */
#define VOUTSIZE    0x2C /* Vertical data output size MSBs */
#define ADVFL       0x2D /* LSB of insert dummy lines in Vertical direction */
#define ADVFH       0x2E /* MSG of insert dummy lines in Vertical direction */
#define YAVE        0x2F /* Y/G Channel Average value */
#define LUMHTH      0x30 /* Histogram AEC/AGC Luminance high level threshold */
#define LUMLTH      0x31 /* Histogram AEC/AGC Luminance low  level threshold */
#define HREF        0x32 /* Image start and size control */
#define DM_LNL      0x33 /* Dummy line low  8 bits */
#define DM_LNH      0x34 /* Dummy line high 8 bits */
#define ADOFF_B     0x35 /* AD offset compensation value for B  channel */
#define ADOFF_R     0x36 /* AD offset compensation value for R  channel */
#define ADOFF_GB    0x37 /* AD offset compensation value for Gb channel */
#define ADOFF_GR    0x38 /* AD offset compensation value for Gr channel */
#define OFF_B       0x39 /* Analog process B  channel offset value */
#define OFF_R       0x3A /* Analog process R  channel offset value */
#define OFF_GB      0x3B /* Analog process Gb channel offset value */
#define OFF_GR      0x3C /* Analog process Gr channel offset value */
#define COM12       0x3D /* Common control 12 */
#define COM13       0x3E /* Common control 13 */
#define COM14       0x3F /* Common control 14 */
#define COM15       0x40 /* Common control 15*/
#define COM16       0x41 /* Common control 16 */
#define TGT_B       0x42 /* BLC blue channel target value */
#define TGT_R       0x43 /* BLC red  channel target value */
#define TGT_GB      0x44 /* BLC Gb   channel target value */
#define TGT_GR      0x45 /* BLC Gr   channel target value */
/* for ov7720 */
#define LCC0        0x46 /* Lens correction control 0 */
#define LCC1        0x47 /* Lens correction option 1 - X coordinate */
#define LCC2        0x48 /* Lens correction option 2 - Y coordinate */
#define LCC3        0x49 /* Lens correction option 3 */
#define LCC4        0x4A /* Lens correction option 4 - radius of the circular */
#define LCC5        0x4B /* Lens correction option 5 */
#define LCC6        0x4C /* Lens correction option 6 */
/* for ov7725 */
#define LC_CTR      0x46 /* Lens correction control */
#define LC_XC       0x47 /* X coordinate of lens correction center relative */
#define LC_YC       0x48 /* Y coordinate of lens correction center relative */
#define LC_COEF     0x49 /* Lens correction coefficient */
#define LC_RADI     0x4A /* Lens correction radius */
#define LC_COEFB    0x4B /* Lens B channel compensation coefficient */
#define LC_COEFR    0x4C /* Lens R channel compensation coefficient */

#define FIXGAIN     0x4D /* Analog fix gain amplifer */
#define AREF0       0x4E /* Sensor reference control */
#define AREF1       0x4F /* Sensor reference current control */
#define AREF2       0x50 /* Analog reference control */
#define AREF3       0x51 /* ADC    reference control */
#define AREF4       0x52 /* ADC    reference control */
#define AREF5       0x53 /* ADC    reference control */
#define AREF6       0x54 /* Analog reference control */
#define AREF7       0x55 /* Analog reference control */
#define UFIX        0x60 /* U channel fixed value output */
#define VFIX        0x61 /* V channel fixed value output */
#define AWBB_BLK    0x62 /* AWB option for advanced AWB */
#define AWB_CTRL0   0x63 /* AWB control byte 0 */
#define DSP_CTRL1   0x64 /* DSP control byte 1 */
#define DSP_CTRL2   0x65 /* DSP control byte 2 */
#define DSP_CTRL3   0x66 /* DSP control byte 3 */
#define DSP_CTRL4   0x67 /* DSP control byte 4 */
#define AWB_BIAS    0x68 /* AWB BLC level clip */
#define AWB_CTRL1   0x69 /* AWB control  1 */
#define AWB_CTRL2   0x6A /* AWB control  2 */
#define AWB_CTRL3   0x6B /* AWB control  3 */
#define AWB_CTRL4   0x6C /* AWB control  4 */
#define AWB_CTRL5   0x6D /* AWB control  5 */
#define AWB_CTRL6   0x6E /* AWB control  6 */
#define AWB_CTRL7   0x6F /* AWB control  7 */
#define AWB_CTRL8   0x70 /* AWB control  8 */
#define AWB_CTRL9   0x71 /* AWB control  9 */
#define AWB_CTRL10  0x72 /* AWB control 10 */
#define AWB_CTRL11  0x73 /* AWB control 11 */
#define AWB_CTRL12  0x74 /* AWB control 12 */
#define AWB_CTRL13  0x75 /* AWB control 13 */
#define AWB_CTRL14  0x76 /* AWB control 14 */
#define AWB_CTRL15  0x77 /* AWB control 15 */
#define AWB_CTRL16  0x78 /* AWB control 16 */
#define AWB_CTRL17  0x79 /* AWB control 17 */
#define AWB_CTRL18  0x7A /* AWB control 18 */
#define AWB_CTRL19  0x7B /* AWB control 19 */
#define AWB_CTRL20  0x7C /* AWB control 20 */
#define AWB_CTRL21  0x7D /* AWB control 21 */
#define GAM1        0x7E /* Gamma Curve  1st segment input end point */
#define GAM2        0x7F /* Gamma Curve  2nd segment input end point */
#define GAM3        0x80 /* Gamma Curve  3rd segment input end point */
#define GAM4        0x81 /* Gamma Curve  4th segment input end point */
#define GAM5        0x82 /* Gamma Curve  5th segment input end point */
#define GAM6        0x83 /* Gamma Curve  6th segment input end point */
#define GAM7        0x84 /* Gamma Curve  7th segment input end point */
#define GAM8        0x85 /* Gamma Curve  8th segment input end point */
#define GAM9        0x86 /* Gamma Curve  9th segment input end point */
#define GAM10       0x87 /* Gamma Curve 10th segment input end point */
#define GAM11       0x88 /* Gamma Curve 11th segment input end point */
#define GAM12       0x89 /* Gamma Curve 12th segment input end point */
#define GAM13       0x8A /* Gamma Curve 13th segment input end point */
#define GAM14       0x8B /* Gamma Curve 14th segment input end point */
#define GAM15       0x8C /* Gamma Curve 15th segment input end point */
#define SLOP        0x8D /* Gamma curve highest segment slope */
#define DNSTH       0x8E /* De-noise threshold */
#define EDGE_STRNGT 0x8F /* Edge strength  control when manual mode */
#define EDGE_TRSHLD 0x90 /* Edge threshold control when manual mode */
#define DNSOFF      0x91 /* Auto De-noise threshold control */
#define EDGE_UPPER  0x92 /* Edge strength upper limit when Auto mode */
#define EDGE_LOWER  0x93 /* Edge strength lower limit when Auto mode */
#define MTX1        0x94 /* Matrix coefficient 1 */
#define MTX2        0x95 /* Matrix coefficient 2 */
#define MTX3        0x96 /* Matrix coefficient 3 */
#define MTX4        0x97 /* Matrix coefficient 4 */
#define MTX5        0x98 /* Matrix coefficient 5 */
#define MTX6        0x99 /* Matrix coefficient 6 */
#define MTX_CTRL    0x9A /* Matrix control */
#define BRIGHT      0x9B /* Brightness control */
#define CNTRST      0x9C /* Contrast contrast */
#define CNTRST_CTRL 0x9D /* Contrast contrast center */
#define UVAD_J0     0x9E /* Auto UV adjust contrast 0 */
#define UVAD_J1     0x9F /* Auto UV adjust contrast 1 */
#define SCAL0       0xA0 /* Scaling control 0 */
#define SCAL1       0xA1 /* Scaling control 1 */
#define SCAL2       0xA2 /* Scaling control 2 */
#define FIFODLYM    0xA3 /* FIFO manual mode delay control */
#define FIFODLYA    0xA4 /* FIFO auto   mode delay control */
#define SDE         0xA6 /* Special digital effect control */
#define USAT        0xA7 /* U component saturation control */
#define VSAT        0xA8 /* V component saturation control */
/* for ov7720 */
#define HUE0        0xA9 /* Hue control 0 */
#define HUE1        0xAA /* Hue control 1 */
/* for ov7725 */
#define HUECOS      0xA9 /* Cosine value */
#define HUESIN      0xAA /* Sine value */

#define SIGN        0xAB /* Sign bit for Hue and contrast */
#define DSPAUTO     0xAC /* DSP auto function ON/OFF control */

/*
 * register detail
 */

/* COM2 */
#define SOFT_SLEEP_MODE 0x10	/* Soft sleep mode */
				/* Output drive capability */
#define OCAP_1x         0x00	/* 1x */
#define OCAP_2x         0x01	/* 2x */
#define OCAP_3x         0x02	/* 3x */
#define OCAP_4x         0x03	/* 4x */

/* COM3 */
#define SWAP_MASK       (SWAP_RGB | SWAP_YUV | SWAP_ML)
#define IMG_MASK        (VFLIP_IMG | HFLIP_IMG)

#define VFLIP_IMG       0x80	/* Vertical flip image ON/OFF selection */
#define HFLIP_IMG       0x40	/* Horizontal mirror image ON/OFF selection */
#define SWAP_RGB        0x20	/* Swap B/R  output sequence in RGB mode */
#define SWAP_YUV        0x10	/* Swap Y/UV output sequence in YUV mode */
#define SWAP_ML         0x08	/* Swap output MSB/LSB */
				/* Tri-state option for output clock */
#define NOTRI_CLOCK     0x04	/*   0: Tri-state    at this period */
				/*   1: No tri-state at this period */
				/* Tri-state option for output data */
#define NOTRI_DATA      0x02	/*   0: Tri-state    at this period */
				/*   1: No tri-state at this period */
#define SCOLOR_TEST     0x01	/* Sensor color bar test pattern */

/* COM4 */
				/* PLL frequency control */
#define PLL_BYPASS      0x00	/*  00: Bypass PLL */
#define PLL_4x          0x40	/*  01: PLL 4x */
#define PLL_6x          0x80	/*  10: PLL 6x */
#define PLL_8x          0xc0	/*  11: PLL 8x */
				/* AEC evaluate window */
#define AEC_FULL        0x00	/*  00: Full window */
#define AEC_1p2         0x10	/*  01: 1/2  window */
#define AEC_1p4         0x20	/*  10: 1/4  window */
#define AEC_2p3         0x30	/*  11: Low 2/3 window */

/* COM5 */
#define AFR_ON_OFF      0x80	/* Auto frame rate control ON/OFF selection */
#define AFR_SPPED       0x40	/* Auto frame rate control speed selection */
				/* Auto frame rate max rate control */
#define AFR_NO_RATE     0x00	/*     No  reduction of frame rate */
#define AFR_1p2         0x10	/*     Max reduction to 1/2 frame rate */
#define AFR_1p4         0x20	/*     Max reduction to 1/4 frame rate */
#define AFR_1p8         0x30	/* Max reduction to 1/8 frame rate */
				/* Auto frame rate active point control */
#define AF_2x           0x00	/*     Add frame when AGC reaches  2x gain */
#define AF_4x           0x04	/*     Add frame when AGC reaches  4x gain */
#define AF_8x           0x08	/*     Add frame when AGC reaches  8x gain */
#define AF_16x          0x0c	/* Add frame when AGC reaches 16x gain */
				/* AEC max step control */
#define AEC_NO_LIMIT    0x01	/*   0 : AEC incease step has limit */
				/*   1 : No limit to AEC increase step */

/* COM7 */
				/* SCCB Register Reset */
#define SCCB_RESET      0x80	/*   0 : No change */
				/*   1 : Resets all registers to default */
				/* Resolution selection */
#define SLCT_MASK       0x40	/*   Mask of VGA or QVGA */
#define SLCT_VGA        0x00	/*   0 : VGA */
#define SLCT_QVGA       0x40	/*   1 : QVGA */
#define ITU656_ON_OFF   0x20	/* ITU656 protocol ON/OFF selection */
				/* RGB output format control */
#define FMT_MASK        0x0c	/*      Mask of color format */
#define FMT_GBR422      0x00	/*      00 : GBR 4:2:2 */
#define FMT_RGB565      0x04	/*      01 : RGB 565 */
#define FMT_RGB555      0x08	/*      10 : RGB 555 */
#define FMT_RGB444      0x0c	/* 11 : RGB 444 */
				/* Output format control */
#define OFMT_MASK       0x03    /*      Mask of output format */
#define OFMT_YUV        0x00	/*      00 : YUV */
#define OFMT_P_BRAW     0x01	/*      01 : Processed Bayer RAW */
#define OFMT_RGB        0x02	/*      10 : RGB */
#define OFMT_BRAW       0x03	/* 11 : Bayer RAW */

/* COM8 */
#define FAST_ALGO       0x80	/* Enable fast AGC/AEC algorithm */
				/* AEC Setp size limit */
#define UNLMT_STEP      0x40	/*   0 : Step size is limited */
				/*   1 : Unlimited step size */
#define BNDF_ON_OFF     0x20	/* Banding filter ON/OFF */
#define AEC_BND         0x10	/* Enable AEC below banding value */
#define AEC_ON_OFF      0x08	/* Fine AEC ON/OFF control */
#define AGC_ON          0x04	/* AGC Enable */
#define AWB_ON          0x02	/* AWB Enable */
#define AEC_ON          0x01	/* AEC Enable */

/* COM9 */
#define BASE_AECAGC     0x80	/* Histogram or average based AEC/AGC */
				/* Automatic gain ceiling - maximum AGC value */
#define GAIN_2x         0x00	/*    000 :   2x */
#define GAIN_4x         0x10	/*    001 :   4x */
#define GAIN_8x         0x20	/*    010 :   8x */
#define GAIN_16x        0x30	/*    011 :  16x */
#define GAIN_32x        0x40	/*    100 :  32x */
#define GAIN_64x        0x50	/* 101 :  64x */
#define GAIN_128x       0x60	/* 110 : 128x */
#define DROP_VSYNC      0x04	/* Drop VSYNC output of corrupt frame */
#define DROP_HREF       0x02	/* Drop HREF  output of corrupt frame */

/* COM11 */
#define SGLF_ON_OFF     0x02	/* Single frame ON/OFF selection */
#define SGLF_TRIG       0x01	/* Single frame transfer trigger */

/* EXHCH */
#define VSIZE_LSB       0x04	/* Vertical data output size LSB */

/* DSP_CTRL1 */
#define FIFO_ON         0x80	/* FIFO enable/disable selection */
#define UV_ON_OFF       0x40	/* UV adjust function ON/OFF selection */
#define YUV444_2_422    0x20	/* YUV444 to 422 UV channel option selection */
#define CLR_MTRX_ON_OFF 0x10	/* Color matrix ON/OFF selection */
#define INTPLT_ON_OFF   0x08	/* Interpolation ON/OFF selection */
#define GMM_ON_OFF      0x04	/* Gamma function ON/OFF selection */
#define AUTO_BLK_ON_OFF 0x02	/* Black defect auto correction ON/OFF */
#define AUTO_WHT_ON_OFF 0x01	/* White define auto correction ON/OFF */

/* DSP_CTRL3 */
#define UV_MASK         0x80	/* UV output sequence option */
#define UV_ON           0x80	/*   ON */
#define UV_OFF          0x00	/*   OFF */
#define CBAR_MASK       0x20	/* DSP Color bar mask */
#define CBAR_ON         0x20	/*   ON */
#define CBAR_OFF        0x00	/*   OFF */

/* HSTART */
#define HST_VGA         0x23
#define HST_QVGA        0x3F

/* HSIZE */
#define HSZ_VGA         0xA0
#define HSZ_QVGA        0x50

/* VSTART */
#define VST_VGA         0x07
#define VST_QVGA        0x03

/* VSIZE */
#define VSZ_VGA         0xF0
#define VSZ_QVGA        0x78

/* HOUTSIZE */
#define HOSZ_VGA        0xA0
#define HOSZ_QVGA       0x50

/* VOUTSIZE */
#define VOSZ_VGA        0xF0
#define VOSZ_QVGA       0x78

/* DSPAUTO (DSP Auto Function ON/OFF Control) */
#define AWB_ACTRL       0x80 /* AWB auto threshold control */
#define DENOISE_ACTRL   0x40 /* De-noise auto threshold control */
#define EDGE_ACTRL      0x20 /* Edge enhancement auto strength control */
#define UV_ACTRL        0x10 /* UV adjust auto slope control */
#define SCAL0_ACTRL     0x08 /* Auto scaling factor control */
#define SCAL1_2_ACTRL   0x04 /* Auto scaling factor control */

/*
 * ID
 */
#define OV7720  0x7720
#define OV7725  0x7721
#define VERSION(pid, ver) ((pid<<8)|(ver&0xFF))

/*
 * struct
 */
struct regval_list {
	unsigned char reg_num;
	unsigned char value;
};

struct ov772x_color_format {
	const struct soc_camera_data_format *format;
	u8 dsp3;
	u8 com3;
	u8 com7;
};

struct ov772x_win_size {
	char                     *name;
	__u32                     width;
	__u32                     height;
	unsigned char             com7_bit;
	const struct regval_list *regs;
};

struct ov772x_priv {
	struct v4l2_subdev                subdev;
	struct ov772x_camera_info        *info;
	const struct ov772x_color_format *fmt;
	const struct ov772x_win_size     *win;
	int                               model;
	unsigned short                    flag_vflip:1;
	unsigned short                    flag_hflip:1;
	/* band_filter = COM8[5] ? 256 - BDBASE : 0 */
	unsigned short                    band_filter;
};

#define ENDMARKER { 0xff, 0xff }

/*
 * register setting for window size
 */
static const struct regval_list ov772x_qvga_regs[] = {
	{ HSTART,   HST_QVGA },
	{ HSIZE,    HSZ_QVGA },
	{ VSTART,   VST_QVGA },
	{ VSIZE,    VSZ_QVGA  },
	{ HOUTSIZE, HOSZ_QVGA },
	{ VOUTSIZE, VOSZ_QVGA },
	ENDMARKER,
};

static const struct regval_list ov772x_vga_regs[] = {
	{ HSTART,   HST_VGA },
	{ HSIZE,    HSZ_VGA },
	{ VSTART,   VST_VGA },
	{ VSIZE,    VSZ_VGA },
	{ HOUTSIZE, HOSZ_VGA },
	{ VOUTSIZE, VOSZ_VGA },
	ENDMARKER,
};

/*
 * supported format list
 */

#define SETFOURCC(type) .name = (#type), .fourcc = (V4L2_PIX_FMT_ ## type)
static const struct soc_camera_data_format ov772x_fmt_lists[] = {
	{
		SETFOURCC(YUYV),
		.depth      = 16,
		.colorspace = V4L2_COLORSPACE_JPEG,
	},
	{
		SETFOURCC(YVYU),
		.depth      = 16,
		.colorspace = V4L2_COLORSPACE_JPEG,
	},
	{
		SETFOURCC(UYVY),
		.depth      = 16,
		.colorspace = V4L2_COLORSPACE_JPEG,
	},
	{
		SETFOURCC(RGB555),
		.depth      = 16,
		.colorspace = V4L2_COLORSPACE_SRGB,
	},
	{
		SETFOURCC(RGB555X),
		.depth      = 16,
		.colorspace = V4L2_COLORSPACE_SRGB,
	},
	{
		SETFOURCC(RGB565),
		.depth      = 16,
		.colorspace = V4L2_COLORSPACE_SRGB,
	},
	{
		SETFOURCC(RGB565X),
		.depth      = 16,
		.colorspace = V4L2_COLORSPACE_SRGB,
	},
};

/*
 * color format list
 */
static const struct ov772x_color_format ov772x_cfmts[] = {
	{
		.format = &ov772x_fmt_lists[0],
		.dsp3   = 0x0,
		.com3   = SWAP_YUV,
		.com7   = OFMT_YUV,
	},
	{
		.format = &ov772x_fmt_lists[1],
		.dsp3   = UV_ON,
		.com3   = SWAP_YUV,
		.com7   = OFMT_YUV,
	},
	{
		.format = &ov772x_fmt_lists[2],
		.dsp3   = 0x0,
		.com3   = 0x0,
		.com7   = OFMT_YUV,
	},
	{
		.format = &ov772x_fmt_lists[3],
		.dsp3   = 0x0,
		.com3   = SWAP_RGB,
		.com7   = FMT_RGB555 | OFMT_RGB,
	},
	{
		.format = &ov772x_fmt_lists[4],
		.dsp3   = 0x0,
		.com3   = 0x0,
		.com7   = FMT_RGB555 | OFMT_RGB,
	},
	{
		.format = &ov772x_fmt_lists[5],
		.dsp3   = 0x0,
		.com3   = SWAP_RGB,
		.com7   = FMT_RGB565 | OFMT_RGB,
	},
	{
		.format = &ov772x_fmt_lists[6],
		.dsp3   = 0x0,
		.com3   = 0x0,
		.com7   = FMT_RGB565 | OFMT_RGB,
	},
};


/*
 * window size list
 */
#define VGA_WIDTH   640
#define VGA_HEIGHT  480
#define QVGA_WIDTH  320
#define QVGA_HEIGHT 240
#define MAX_WIDTH   VGA_WIDTH
#define MAX_HEIGHT  VGA_HEIGHT

static const struct ov772x_win_size ov772x_win_vga = {
	.name     = "VGA",
	.width    = VGA_WIDTH,
	.height   = VGA_HEIGHT,
	.com7_bit = SLCT_VGA,
	.regs     = ov772x_vga_regs,
};

static const struct ov772x_win_size ov772x_win_qvga = {
	.name     = "QVGA",
	.width    = QVGA_WIDTH,
	.height   = QVGA_HEIGHT,
	.com7_bit = SLCT_QVGA,
	.regs     = ov772x_qvga_regs,
};

static const struct v4l2_queryctrl ov772x_controls[] = {
	{
		.id		= V4L2_CID_VFLIP,
		.type		= V4L2_CTRL_TYPE_BOOLEAN,
		.name		= "Flip Vertically",
		.minimum	= 0,
		.maximum	= 1,
		.step		= 1,
		.default_value	= 0,
	},
	{
		.id		= V4L2_CID_HFLIP,
		.type		= V4L2_CTRL_TYPE_BOOLEAN,
		.name		= "Flip Horizontally",
		.minimum	= 0,
		.maximum	= 1,
		.step		= 1,
		.default_value	= 0,
	},
	{
		.id		= V4L2_CID_BAND_STOP_FILTER,
		.type		= V4L2_CTRL_TYPE_INTEGER,
		.name		= "Band-stop filter",
		.minimum	= 0,
		.maximum	= 256,
		.step		= 1,
		.default_value	= 0,
	},
};


/*
 * general function
 */

static struct ov772x_priv *to_ov772x(const struct i2c_client *client)
{
	return container_of(i2c_get_clientdata(client), struct ov772x_priv,
			    subdev);
}

static int ov772x_write_array(struct i2c_client        *client,
			      const struct regval_list *vals)
{
	while (vals->reg_num != 0xff) {
		int ret = i2c_smbus_write_byte_data(client,
						    vals->reg_num,
						    vals->value);
		if (ret < 0)
			return ret;
		vals++;
	}
	return 0;
}

static int ov772x_mask_set(struct i2c_client *client,
					  u8  command,
					  u8  mask,
					  u8  set)
{
	s32 val = i2c_smbus_read_byte_data(client, command);
	if (val < 0)
		return val;

	val &= ~mask;
	val |= set & mask;

	return i2c_smbus_write_byte_data(client, command, val);
}

static int ov772x_reset(struct i2c_client *client)
{
	int ret = i2c_smbus_write_byte_data(client, COM7, SCCB_RESET);
	msleep(1);
	return ret;
}

/*
 * soc_camera_ops function
 */

static int ov772x_s_stream(struct v4l2_subdev *sd, int enable)
{
	struct i2c_client *client = sd->priv;
	struct ov772x_priv *priv = to_ov772x(client);

	if (!enable) {
		ov772x_mask_set(client, COM2, SOFT_SLEEP_MODE, SOFT_SLEEP_MODE);
		return 0;
	}

	if (!priv->win || !priv->fmt) {
		dev_err(&client->dev, "norm or win select error\n");
		return -EPERM;
	}

	ov772x_mask_set(client, COM2, SOFT_SLEEP_MODE, 0);

	dev_dbg(&client->dev, "format %s, win %s\n",
		priv->fmt->format->name, priv->win->name);

	return 0;
}

static int ov772x_set_bus_param(struct soc_camera_device *icd,
				unsigned long		  flags)
{
	return 0;
}

static unsigned long ov772x_query_bus_param(struct soc_camera_device *icd)
{
	struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
	struct ov772x_priv *priv = i2c_get_clientdata(client);
	struct soc_camera_link *icl = to_soc_camera_link(icd);
	unsigned long flags = SOCAM_PCLK_SAMPLE_RISING | SOCAM_MASTER |
		SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_HIGH |
		SOCAM_DATA_ACTIVE_HIGH | priv->info->buswidth;

	return soc_camera_apply_sensor_flags(icl, flags);
}

static int ov772x_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
{
	struct i2c_client *client = sd->priv;
	struct ov772x_priv *priv = to_ov772x(client);

	switch (ctrl->id) {
	case V4L2_CID_VFLIP:
		ctrl->value = priv->flag_vflip;
		break;
	case V4L2_CID_HFLIP:
		ctrl->value = priv->flag_hflip;
		break;
	case V4L2_CID_BAND_STOP_FILTER:
		ctrl->value = priv->band_filter;
		break;
	}
	return 0;
}

static int ov772x_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
{
	struct i2c_client *client = sd->priv;
	struct ov772x_priv *priv = to_ov772x(client);
	int ret = 0;
	u8 val;

	switch (ctrl->id) {
	case V4L2_CID_VFLIP:
		val = ctrl->value ? VFLIP_IMG : 0x00;
		priv->flag_vflip = ctrl->value;
		if (priv->info->flags & OV772X_FLAG_VFLIP)
			val ^= VFLIP_IMG;
		ret = ov772x_mask_set(client, COM3, VFLIP_IMG, val);
		break;
	case V4L2_CID_HFLIP:
		val = ctrl->value ? HFLIP_IMG : 0x00;
		priv->flag_hflip = ctrl->value;
		if (priv->info->flags & OV772X_FLAG_HFLIP)
			val ^= HFLIP_IMG;
		ret = ov772x_mask_set(client, COM3, HFLIP_IMG, val);
		break;
	case V4L2_CID_BAND_STOP_FILTER:
		if ((unsigned)ctrl->value > 256)
			ctrl->value = 256;
		if (ctrl->value == priv->band_filter)
			break;
		if (!ctrl->value) {
			/* Switch the filter off, it is on now */
			ret = ov772x_mask_set(client, BDBASE, 0xff, 0xff);
			if (!ret)
				ret = ov772x_mask_set(client, COM8,
						      BNDF_ON_OFF, 0);
		} else {
			/* Switch the filter on, set AEC low limit */
			val = 256 - ctrl->value;
			ret = ov772x_mask_set(client, COM8,
					      BNDF_ON_OFF, BNDF_ON_OFF);
			if (!ret)
				ret = ov772x_mask_set(client, BDBASE,
						      0xff, val);
		}
		if (!ret)
			priv->band_filter = ctrl->value;
		break;
	}

	return ret;
}

static int ov772x_g_chip_ident(struct v4l2_subdev *sd,
			       struct v4l2_dbg_chip_ident *id)
{
	struct i2c_client *client = sd->priv;
	struct ov772x_priv *priv = to_ov772x(client);

	id->ident    = priv->model;
	id->revision = 0;

	return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int ov772x_g_register(struct v4l2_subdev *sd,
			     struct v4l2_dbg_register *reg)
{
	struct i2c_client *client = sd->priv;
	int ret;

	reg->size = 1;
	if (reg->reg > 0xff)
		return -EINVAL;

	ret = i2c_smbus_read_byte_data(client, reg->reg);
	if (ret < 0)
		return ret;

	reg->val = (__u64)ret;

	return 0;
}

static int ov772x_s_register(struct v4l2_subdev *sd,
			     struct v4l2_dbg_register *reg)
{
	struct i2c_client *client = sd->priv;

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

	return i2c_smbus_write_byte_data(client, reg->reg, reg->val);
}
#endif

static const struct ov772x_win_size *ov772x_select_win(u32 width, u32 height)
{
	__u32 diff;
	const struct ov772x_win_size *win;

	/* default is QVGA */
	diff = abs(width - ov772x_win_qvga.width) +
		abs(height - ov772x_win_qvga.height);
	win = &ov772x_win_qvga;

	/* VGA */
	if (diff >
	    abs(width  - ov772x_win_vga.width) +
	    abs(height - ov772x_win_vga.height))
		win = &ov772x_win_vga;

	return win;
}

static int ov772x_set_params(struct i2c_client *client,
			     u32 *width, u32 *height, u32 pixfmt)
{
	struct ov772x_priv *priv = to_ov772x(client);
	int ret = -EINVAL;
	u8  val;
	int i;

	/*
	 * select format
	 */
	priv->fmt = NULL;
	for (i = 0; i < ARRAY_SIZE(ov772x_cfmts); i++) {
		if (pixfmt == ov772x_cfmts[i].format->fourcc) {
			priv->fmt = ov772x_cfmts + i;
			break;
		}
	}
	if (!priv->fmt)
		goto ov772x_set_fmt_error;

	/*
	 * select win
	 */
	priv->win = ov772x_select_win(*width, *height);

	/*
	 * reset hardware
	 */
	ov772x_reset(client);

	/*
	 * Edge Ctrl
	 */
	if (priv->info->edgectrl.strength & OV772X_MANUAL_EDGE_CTRL) {

		/*
		 * Manual Edge Control Mode
		 *
		 * Edge auto strength bit is set by default.
		 * Remove it when manual mode.
		 */

		ret = ov772x_mask_set(client, DSPAUTO, EDGE_ACTRL, 0x00);
		if (ret < 0)
			goto ov772x_set_fmt_error;

		ret = ov772x_mask_set(client,
				      EDGE_TRSHLD, EDGE_THRESHOLD_MASK,
				      priv->info->edgectrl.threshold);
		if (ret < 0)
			goto ov772x_set_fmt_error;

		ret = ov772x_mask_set(client,
				      EDGE_STRNGT, EDGE_STRENGTH_MASK,
				      priv->info->edgectrl.strength);
		if (ret < 0)
			goto ov772x_set_fmt_error;

	} else if (priv->info->edgectrl.upper > priv->info->edgectrl.lower) {
		/*
		 * Auto Edge Control Mode
		 *
		 * set upper and lower limit
		 */
		ret = ov772x_mask_set(client,
				      EDGE_UPPER, EDGE_UPPER_MASK,
				      priv->info->edgectrl.upper);
		if (ret < 0)
			goto ov772x_set_fmt_error;

		ret = ov772x_mask_set(client,
				      EDGE_LOWER, EDGE_LOWER_MASK,
				      priv->info->edgectrl.lower);
		if (ret < 0)
			goto ov772x_set_fmt_error;
	}

	/*
	 * set size format
	 */
	ret = ov772x_write_array(client, priv->win->regs);
	if (ret < 0)
		goto ov772x_set_fmt_error;

	/*
	 * set DSP_CTRL3
	 */
	val = priv->fmt->dsp3;
	if (val) {
		ret = ov772x_mask_set(client,
				      DSP_CTRL3, UV_MASK, val);
		if (ret < 0)
			goto ov772x_set_fmt_error;
	}

	/*
	 * set COM3
	 */
	val = priv->fmt->com3;
	if (priv->info->flags & OV772X_FLAG_VFLIP)
		val |= VFLIP_IMG;
	if (priv->info->flags & OV772X_FLAG_HFLIP)
		val |= HFLIP_IMG;
	if (priv->flag_vflip)
		val ^= VFLIP_IMG;
	if (priv->flag_hflip)
		val ^= HFLIP_IMG;

	ret = ov772x_mask_set(client,
			      COM3, SWAP_MASK | IMG_MASK, val);
	if (ret < 0)
		goto ov772x_set_fmt_error;

	/*
	 * set COM7
	 */
	val = priv->win->com7_bit | priv->fmt->com7;
	ret = ov772x_mask_set(client,
			      COM7, (SLCT_MASK | FMT_MASK | OFMT_MASK),
			      val);
	if (ret < 0)
		goto ov772x_set_fmt_error;

	/*
	 * set COM8
	 */
	if (priv->band_filter) {
		ret = ov772x_mask_set(client, COM8, BNDF_ON_OFF, 1);
		if (!ret)
			ret = ov772x_mask_set(client, BDBASE,
					      0xff, 256 - priv->band_filter);
		if (ret < 0)
			goto ov772x_set_fmt_error;
	}

	*width = priv->win->width;
	*height = priv->win->height;

	return ret;

ov772x_set_fmt_error:

	ov772x_reset(client);
	priv->win = NULL;
	priv->fmt = NULL;

	return ret;
}

static int ov772x_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
{
	a->c.left	= 0;
	a->c.top	= 0;
	a->c.width	= VGA_WIDTH;
	a->c.height	= VGA_HEIGHT;
	a->type		= V4L2_BUF_TYPE_VIDEO_CAPTURE;

	return 0;
}

static int ov772x_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
{
	a->bounds.left			= 0;
	a->bounds.top			= 0;
	a->bounds.width			= VGA_WIDTH;
	a->bounds.height		= VGA_HEIGHT;
	a->defrect			= a->bounds;
	a->type				= V4L2_BUF_TYPE_VIDEO_CAPTURE;
	a->pixelaspect.numerator	= 1;
	a->pixelaspect.denominator	= 1;

	return 0;
}

static int ov772x_g_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
{
	struct i2c_client *client = sd->priv;
	struct ov772x_priv *priv = to_ov772x(client);
	struct v4l2_pix_format *pix = &f->fmt.pix;

	if (!priv->win || !priv->fmt) {
		u32 width = VGA_WIDTH, height = VGA_HEIGHT;
		int ret = ov772x_set_params(client, &width, &height,
					    V4L2_PIX_FMT_YUYV);
		if (ret < 0)
			return ret;
	}

	f->type			= V4L2_BUF_TYPE_VIDEO_CAPTURE;

	pix->width		= priv->win->width;
	pix->height		= priv->win->height;
	pix->pixelformat	= priv->fmt->format->fourcc;
	pix->colorspace		= priv->fmt->format->colorspace;
	pix->field		= V4L2_FIELD_NONE;

	return 0;
}

static int ov772x_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
{
	struct i2c_client *client = sd->priv;
	struct v4l2_pix_format *pix = &f->fmt.pix;

	return ov772x_set_params(client, &pix->width, &pix->height,
				 pix->pixelformat);
}

static int ov772x_try_fmt(struct v4l2_subdev *sd,
			  struct v4l2_format *f)
{
	struct v4l2_pix_format *pix = &f->fmt.pix;
	const struct ov772x_win_size *win;

	/*
	 * select suitable win
	 */
	win = ov772x_select_win(pix->width, pix->height);

	pix->width  = win->width;
	pix->height = win->height;
	pix->field  = V4L2_FIELD_NONE;

	return 0;
}

static int ov772x_video_probe(struct soc_camera_device *icd,
			      struct i2c_client *client)
{
	struct ov772x_priv *priv = to_ov772x(client);
	u8                  pid, ver;
	const char         *devname;

	/*
	 * We must have a parent by now. And it cannot be a wrong one.
	 * So this entire test is completely redundant.
	 */
	if (!icd->dev.parent ||
	    to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
		return -ENODEV;

	/*
	 * ov772x only use 8 or 10 bit bus width
	 */
	if (SOCAM_DATAWIDTH_10 != priv->info->buswidth &&
	    SOCAM_DATAWIDTH_8  != priv->info->buswidth) {
		dev_err(&client->dev, "bus width error\n");
		return -ENODEV;
	}

	icd->formats     = ov772x_fmt_lists;
	icd->num_formats = ARRAY_SIZE(ov772x_fmt_lists);

	/*
	 * check and show product ID and manufacturer ID
	 */
	pid = i2c_smbus_read_byte_data(client, PID);
	ver = i2c_smbus_read_byte_data(client, VER);

	switch (VERSION(pid, ver)) {
	case OV7720:
		devname     = "ov7720";
		priv->model = V4L2_IDENT_OV7720;
		break;
	case OV7725:
		devname     = "ov7725";
		priv->model = V4L2_IDENT_OV7725;
		break;
	default:
		dev_err(&client->dev,
			"Product ID error %x:%x\n", pid, ver);
		return -ENODEV;
	}

	dev_info(&client->dev,
		 "%s Product ID %0x:%0x Manufacturer ID %x:%x\n",
		 devname,
		 pid,
		 ver,
		 i2c_smbus_read_byte_data(client, MIDH),
		 i2c_smbus_read_byte_data(client, MIDL));

	return 0;
}

static struct soc_camera_ops ov772x_ops = {
	.set_bus_param		= ov772x_set_bus_param,
	.query_bus_param	= ov772x_query_bus_param,
	.controls		= ov772x_controls,
	.num_controls		= ARRAY_SIZE(ov772x_controls),
};

static struct v4l2_subdev_core_ops ov772x_subdev_core_ops = {
	.g_ctrl		= ov772x_g_ctrl,
	.s_ctrl		= ov772x_s_ctrl,
	.g_chip_ident	= ov772x_g_chip_ident,
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.g_register	= ov772x_g_register,
	.s_register	= ov772x_s_register,
#endif
};

static struct v4l2_subdev_video_ops ov772x_subdev_video_ops = {
	.s_stream	= ov772x_s_stream,
	.g_fmt		= ov772x_g_fmt,
	.s_fmt		= ov772x_s_fmt,
	.try_fmt	= ov772x_try_fmt,
	.cropcap	= ov772x_cropcap,
	.g_crop		= ov772x_g_crop,
};

static struct v4l2_subdev_ops ov772x_subdev_ops = {
	.core	= &ov772x_subdev_core_ops,
	.video	= &ov772x_subdev_video_ops,
};

/*
 * i2c_driver function
 */

static int ov772x_probe(struct i2c_client *client,
			const struct i2c_device_id *did)
{
	struct ov772x_priv        *priv;
	struct ov772x_camera_info *info;
	struct soc_camera_device  *icd = client->dev.platform_data;
	struct i2c_adapter        *adapter = to_i2c_adapter(client->dev.parent);
	struct soc_camera_link    *icl;
	int                        ret;

	if (!icd) {
		dev_err(&client->dev, "OV772X: missing soc-camera data!\n");
		return -EINVAL;
	}

	icl = to_soc_camera_link(icd);
	if (!icl)
		return -EINVAL;

	info = container_of(icl, struct ov772x_camera_info, link);

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
		dev_err(&adapter->dev,
			"I2C-Adapter doesn't support "
			"I2C_FUNC_SMBUS_BYTE_DATA\n");
		return -EIO;
	}

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->info = info;

	v4l2_i2c_subdev_init(&priv->subdev, client, &ov772x_subdev_ops);

	icd->ops		= &ov772x_ops;

	ret = ov772x_video_probe(icd, client);
	if (ret) {
		icd->ops = NULL;
		i2c_set_clientdata(client, NULL);
		kfree(priv);
	}

	return ret;
}

static int ov772x_remove(struct i2c_client *client)
{
	struct ov772x_priv *priv = to_ov772x(client);
	struct soc_camera_device *icd = client->dev.platform_data;

	icd->ops = NULL;
	i2c_set_clientdata(client, NULL);
	kfree(priv);
	return 0;
}

static const struct i2c_device_id ov772x_id[] = {
	{ "ov772x", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ov772x_id);

static struct i2c_driver ov772x_i2c_driver = {
	.driver = {
		.name = "ov772x",
	},
	.probe    = ov772x_probe,
	.remove   = ov772x_remove,
	.id_table = ov772x_id,
};

/*
 * module function
 */

static int __init ov772x_module_init(void)
{
	return i2c_add_driver(&ov772x_i2c_driver);
}

static void __exit ov772x_module_exit(void)
{
	i2c_del_driver(&ov772x_i2c_driver);
}

module_init(ov772x_module_init);
module_exit(ov772x_module_exit);

MODULE_DESCRIPTION("SoC Camera driver for ov772x");
MODULE_AUTHOR("Kuninori Morimoto");
MODULE_LICENSE("GPL v2");