/**
 * OV519 driver
 *
 * Copyright (C) 2008 Jean-Francois Moine (http://moinejf.free.fr)
 *
 * This module is adapted from the ov51x-jpeg package, which itself
 * was adapted from the ov511 driver.
 *
 * Original copyright for the ov511 driver is:
 *
 * Copyright (c) 1999-2004 Mark W. McClelland
 * Support for OV519, OV8610 Copyright (c) 2003 Joerg Heckenbach
 *
 * ov51x-jpeg original copyright is:
 *
 * Copyright (c) 2004-2007 Romain Beauxis <toots@rastageeks.org>
 * Support for OV7670 sensors was contributed by Sam Skipsey <aoanla@yahoo.com>
 *
 * 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
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */
#define MODULE_NAME "ov519"

#include "gspca.h"

MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
MODULE_DESCRIPTION("OV519 USB Camera Driver");
MODULE_LICENSE("GPL");

/* global parameters */
static int frame_rate;

/* Number of times to retry a failed I2C transaction. Increase this if you
 * are getting "Failed to read sensor ID..." */
static int i2c_detect_tries = 10;

/* ov519 device descriptor */
struct sd {
	struct gspca_dev gspca_dev;		/* !! must be the first item */

	/* Determined by sensor type */
	__u8 sif;

	__u8 brightness;
	__u8 contrast;
	__u8 colors;
	__u8 hflip;
	__u8 vflip;

	__u8 stopped;		/* Streaming is temporarily paused */

	__u8 frame_rate;	/* current Framerate (OV519 only) */
	__u8 clockdiv;		/* clockdiv override for OV519 only */

	char sensor;		/* Type of image sensor chip (SEN_*) */
#define SEN_UNKNOWN 0
#define SEN_OV6620 1
#define SEN_OV6630 2
#define SEN_OV7610 3
#define SEN_OV7620 4
#define SEN_OV7640 5
#define SEN_OV7670 6
#define SEN_OV76BE 7
#define SEN_OV8610 8
};

/* V4L2 controls supported by the driver */
static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setcontrast(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getcontrast(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setcolors(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getcolors(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_sethflip(struct gspca_dev *gspca_dev, __s32 val);
static int sd_gethflip(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setvflip(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getvflip(struct gspca_dev *gspca_dev, __s32 *val);

static struct ctrl sd_ctrls[] = {
	{
	    {
		.id      = V4L2_CID_BRIGHTNESS,
		.type    = V4L2_CTRL_TYPE_INTEGER,
		.name    = "Brightness",
		.minimum = 0,
		.maximum = 255,
		.step    = 1,
#define BRIGHTNESS_DEF 127
		.default_value = BRIGHTNESS_DEF,
	    },
	    .set = sd_setbrightness,
	    .get = sd_getbrightness,
	},
	{
	    {
		.id      = V4L2_CID_CONTRAST,
		.type    = V4L2_CTRL_TYPE_INTEGER,
		.name    = "Contrast",
		.minimum = 0,
		.maximum = 255,
		.step    = 1,
#define CONTRAST_DEF 127
		.default_value = CONTRAST_DEF,
	    },
	    .set = sd_setcontrast,
	    .get = sd_getcontrast,
	},
	{
	    {
		.id      = V4L2_CID_SATURATION,
		.type    = V4L2_CTRL_TYPE_INTEGER,
		.name    = "Color",
		.minimum = 0,
		.maximum = 255,
		.step    = 1,
#define COLOR_DEF 127
		.default_value = COLOR_DEF,
	    },
	    .set = sd_setcolors,
	    .get = sd_getcolors,
	},
/* next controls work with ov7670 only */
#define HFLIP_IDX 3
	{
	    {
		.id      = V4L2_CID_HFLIP,
		.type    = V4L2_CTRL_TYPE_BOOLEAN,
		.name    = "Mirror",
		.minimum = 0,
		.maximum = 1,
		.step    = 1,
#define HFLIP_DEF 0
		.default_value = HFLIP_DEF,
	    },
	    .set = sd_sethflip,
	    .get = sd_gethflip,
	},
#define VFLIP_IDX 4
	{
	    {
		.id      = V4L2_CID_VFLIP,
		.type    = V4L2_CTRL_TYPE_BOOLEAN,
		.name    = "Vflip",
		.minimum = 0,
		.maximum = 1,
		.step    = 1,
#define VFLIP_DEF 0
		.default_value = VFLIP_DEF,
	    },
	    .set = sd_setvflip,
	    .get = sd_getvflip,
	},
};

static struct v4l2_pix_format vga_mode[] = {
	{320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
		.bytesperline = 320,
		.sizeimage = 320 * 240 * 3 / 8 + 590,
		.colorspace = V4L2_COLORSPACE_JPEG,
		.priv = 1},
	{640, 480, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
		.bytesperline = 640,
		.sizeimage = 640 * 480 * 3 / 8 + 590,
		.colorspace = V4L2_COLORSPACE_JPEG,
		.priv = 0},
};
static struct v4l2_pix_format sif_mode[] = {
	{176, 144, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
		.bytesperline = 176,
		.sizeimage = 176 * 144 * 3 / 8 + 590,
		.colorspace = V4L2_COLORSPACE_JPEG,
		.priv = 1},
	{352, 288, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
		.bytesperline = 352,
		.sizeimage = 352 * 288 * 3 / 8 + 590,
		.colorspace = V4L2_COLORSPACE_JPEG,
		.priv = 0},
};

/* OV519 Camera interface register numbers */
#define OV519_R10_H_SIZE		0x10
#define OV519_R11_V_SIZE		0x11
#define OV519_R12_X_OFFSETL		0x12
#define OV519_R13_X_OFFSETH		0x13
#define OV519_R14_Y_OFFSETL		0x14
#define OV519_R15_Y_OFFSETH		0x15
#define OV519_R16_DIVIDER		0x16
#define OV519_R20_DFR			0x20
#define OV519_R25_FORMAT		0x25

/* OV519 System Controller register numbers */
#define OV519_SYS_RESET1 0x51
#define OV519_SYS_EN_CLK1 0x54

#define OV519_GPIO_DATA_OUT0		0x71
#define OV519_GPIO_IO_CTRL0		0x72

#define OV511_ENDPOINT_ADDRESS  1	/* Isoc endpoint number */

/* I2C registers */
#define R51x_I2C_W_SID		0x41
#define R51x_I2C_SADDR_3	0x42
#define R51x_I2C_SADDR_2	0x43
#define R51x_I2C_R_SID		0x44
#define R51x_I2C_DATA		0x45
#define R518_I2C_CTL		0x47	/* OV518(+) only */

/* I2C ADDRESSES */
#define OV7xx0_SID   0x42
#define OV8xx0_SID   0xa0
#define OV6xx0_SID   0xc0

/* OV7610 registers */
#define OV7610_REG_GAIN		0x00	/* gain setting (5:0) */
#define OV7610_REG_SAT		0x03	/* saturation */
#define OV8610_REG_HUE		0x04	/* 04 reserved */
#define OV7610_REG_CNT		0x05	/* Y contrast */
#define OV7610_REG_BRT		0x06	/* Y brightness */
#define OV7610_REG_COM_C	0x14	/* misc common regs */
#define OV7610_REG_ID_HIGH	0x1c	/* manufacturer ID MSB */
#define OV7610_REG_ID_LOW	0x1d	/* manufacturer ID LSB */
#define OV7610_REG_COM_I	0x29	/* misc settings */

/* OV7670 registers */
#define OV7670_REG_GAIN        0x00    /* Gain lower 8 bits (rest in vref) */
#define OV7670_REG_BLUE        0x01    /* blue gain */
#define OV7670_REG_RED         0x02    /* red gain */
#define OV7670_REG_VREF        0x03    /* Pieces of GAIN, VSTART, VSTOP */
#define OV7670_REG_COM1        0x04    /* Control 1 */
#define OV7670_REG_AECHH       0x07    /* AEC MS 5 bits */
#define OV7670_REG_COM3        0x0c    /* Control 3 */
#define OV7670_REG_COM4        0x0d    /* Control 4 */
#define OV7670_REG_COM5        0x0e    /* All "reserved" */
#define OV7670_REG_COM6        0x0f    /* Control 6 */
#define OV7670_REG_AECH        0x10    /* More bits of AEC value */
#define OV7670_REG_CLKRC       0x11    /* Clock control */
#define OV7670_REG_COM7        0x12    /* Control 7 */
#define   OV7670_COM7_FMT_VGA    0x00
#define   OV7670_COM7_YUV        0x00    /* YUV */
#define   OV7670_COM7_FMT_QVGA   0x10    /* QVGA format */
#define   OV7670_COM7_FMT_MASK   0x38
#define   OV7670_COM7_RESET      0x80    /* Register reset */
#define OV7670_REG_COM8        0x13    /* Control 8 */
#define   OV7670_COM8_AEC        0x01    /* Auto exposure enable */
#define   OV7670_COM8_AWB        0x02    /* White balance enable */
#define   OV7670_COM8_AGC        0x04    /* Auto gain enable */
#define   OV7670_COM8_BFILT      0x20    /* Band filter enable */
#define   OV7670_COM8_AECSTEP    0x40    /* Unlimited AEC step size */
#define   OV7670_COM8_FASTAEC    0x80    /* Enable fast AGC/AEC */
#define OV7670_REG_COM9        0x14    /* Control 9  - gain ceiling */
#define OV7670_REG_COM10       0x15    /* Control 10 */
#define OV7670_REG_HSTART      0x17    /* Horiz start high bits */
#define OV7670_REG_HSTOP       0x18    /* Horiz stop high bits */
#define OV7670_REG_VSTART      0x19    /* Vert start high bits */
#define OV7670_REG_VSTOP       0x1a    /* Vert stop high bits */
#define OV7670_REG_MVFP        0x1e    /* Mirror / vflip */
#define   OV7670_MVFP_VFLIP	 0x10    /* vertical flip */
#define   OV7670_MVFP_MIRROR     0x20    /* Mirror image */
#define OV7670_REG_AEW         0x24    /* AGC upper limit */
#define OV7670_REG_AEB         0x25    /* AGC lower limit */
#define OV7670_REG_VPT         0x26    /* AGC/AEC fast mode op region */
#define OV7670_REG_HREF        0x32    /* HREF pieces */
#define OV7670_REG_TSLB        0x3a    /* lots of stuff */
#define OV7670_REG_COM11       0x3b    /* Control 11 */
#define   OV7670_COM11_EXP       0x02
#define   OV7670_COM11_HZAUTO    0x10    /* Auto detect 50/60 Hz */
#define OV7670_REG_COM12       0x3c    /* Control 12 */
#define OV7670_REG_COM13       0x3d    /* Control 13 */
#define   OV7670_COM13_GAMMA     0x80    /* Gamma enable */
#define   OV7670_COM13_UVSAT     0x40    /* UV saturation auto adjustment */
#define OV7670_REG_COM14       0x3e    /* Control 14 */
#define OV7670_REG_EDGE        0x3f    /* Edge enhancement factor */
#define OV7670_REG_COM15       0x40    /* Control 15 */
#define   OV7670_COM15_R00FF     0xc0    /*            00 to FF */
#define OV7670_REG_COM16       0x41    /* Control 16 */
#define   OV7670_COM16_AWBGAIN   0x08    /* AWB gain enable */
#define OV7670_REG_BRIGHT      0x55    /* Brightness */
#define OV7670_REG_CONTRAS     0x56    /* Contrast control */
#define OV7670_REG_GFIX        0x69    /* Fix gain control */
#define OV7670_REG_RGB444      0x8c    /* RGB 444 control */
#define OV7670_REG_HAECC1      0x9f    /* Hist AEC/AGC control 1 */
#define OV7670_REG_HAECC2      0xa0    /* Hist AEC/AGC control 2 */
#define OV7670_REG_BD50MAX     0xa5    /* 50hz banding step limit */
#define OV7670_REG_HAECC3      0xa6    /* Hist AEC/AGC control 3 */
#define OV7670_REG_HAECC4      0xa7    /* Hist AEC/AGC control 4 */
#define OV7670_REG_HAECC5      0xa8    /* Hist AEC/AGC control 5 */
#define OV7670_REG_HAECC6      0xa9    /* Hist AEC/AGC control 6 */
#define OV7670_REG_HAECC7      0xaa    /* Hist AEC/AGC control 7 */
#define OV7670_REG_BD60MAX     0xab    /* 60hz banding step limit */

struct ov_regvals {
	__u8 reg;
	__u8 val;
};
struct ov_i2c_regvals {
	__u8 reg;
	__u8 val;
};

static const struct ov_i2c_regvals norm_6x20[] = {
	{ 0x12, 0x80 }, /* reset */
	{ 0x11, 0x01 },
	{ 0x03, 0x60 },
	{ 0x05, 0x7f }, /* For when autoadjust is off */
	{ 0x07, 0xa8 },
	/* The ratio of 0x0c and 0x0d  controls the white point */
	{ 0x0c, 0x24 },
	{ 0x0d, 0x24 },
	{ 0x0f, 0x15 }, /* COMS */
	{ 0x10, 0x75 }, /* AEC Exposure time */
	{ 0x12, 0x24 }, /* Enable AGC */
	{ 0x14, 0x04 },
	/* 0x16: 0x06 helps frame stability with moving objects */
	{ 0x16, 0x06 },
/*	{ 0x20, 0x30 },  * Aperture correction enable */
	{ 0x26, 0xb2 }, /* BLC enable */
	/* 0x28: 0x05 Selects RGB format if RGB on */
	{ 0x28, 0x05 },
	{ 0x2a, 0x04 }, /* Disable framerate adjust */
/*	{ 0x2b, 0xac },  * Framerate; Set 2a[7] first */
	{ 0x2d, 0x99 },
	{ 0x33, 0xa0 }, /* Color Processing Parameter */
	{ 0x34, 0xd2 }, /* Max A/D range */
	{ 0x38, 0x8b },
	{ 0x39, 0x40 },

	{ 0x3c, 0x39 }, /* Enable AEC mode changing */
	{ 0x3c, 0x3c }, /* Change AEC mode */
	{ 0x3c, 0x24 }, /* Disable AEC mode changing */

	{ 0x3d, 0x80 },
	/* These next two registers (0x4a, 0x4b) are undocumented.
	 * They control the color balance */
	{ 0x4a, 0x80 },
	{ 0x4b, 0x80 },
	{ 0x4d, 0xd2 }, /* This reduces noise a bit */
	{ 0x4e, 0xc1 },
	{ 0x4f, 0x04 },
/* Do 50-53 have any effect? */
/* Toggle 0x12[2] off and on here? */
};

static const struct ov_i2c_regvals norm_6x30[] = {
	{ 0x12, 0x80 }, /* Reset */
	{ 0x00, 0x1f }, /* Gain */
	{ 0x01, 0x99 }, /* Blue gain */
	{ 0x02, 0x7c }, /* Red gain */
	{ 0x03, 0xc0 }, /* Saturation */
	{ 0x05, 0x0a }, /* Contrast */
	{ 0x06, 0x95 }, /* Brightness */
	{ 0x07, 0x2d }, /* Sharpness */
	{ 0x0c, 0x20 },
	{ 0x0d, 0x20 },
	{ 0x0e, 0x20 },
	{ 0x0f, 0x05 },
	{ 0x10, 0x9a },
	{ 0x11, 0x00 }, /* Pixel clock = fastest */
	{ 0x12, 0x24 }, /* Enable AGC and AWB */
	{ 0x13, 0x21 },
	{ 0x14, 0x80 },
	{ 0x15, 0x01 },
	{ 0x16, 0x03 },
	{ 0x17, 0x38 },
	{ 0x18, 0xea },
	{ 0x19, 0x04 },
	{ 0x1a, 0x93 },
	{ 0x1b, 0x00 },
	{ 0x1e, 0xc4 },
	{ 0x1f, 0x04 },
	{ 0x20, 0x20 },
	{ 0x21, 0x10 },
	{ 0x22, 0x88 },
	{ 0x23, 0xc0 }, /* Crystal circuit power level */
	{ 0x25, 0x9a }, /* Increase AEC black ratio */
	{ 0x26, 0xb2 }, /* BLC enable */
	{ 0x27, 0xa2 },
	{ 0x28, 0x00 },
	{ 0x29, 0x00 },
	{ 0x2a, 0x84 }, /* 60 Hz power */
	{ 0x2b, 0xa8 }, /* 60 Hz power */
	{ 0x2c, 0xa0 },
	{ 0x2d, 0x95 }, /* Enable auto-brightness */
	{ 0x2e, 0x88 },
	{ 0x33, 0x26 },
	{ 0x34, 0x03 },
	{ 0x36, 0x8f },
	{ 0x37, 0x80 },
	{ 0x38, 0x83 },
	{ 0x39, 0x80 },
	{ 0x3a, 0x0f },
	{ 0x3b, 0x3c },
	{ 0x3c, 0x1a },
	{ 0x3d, 0x80 },
	{ 0x3e, 0x80 },
	{ 0x3f, 0x0e },
	{ 0x40, 0x00 }, /* White bal */
	{ 0x41, 0x00 }, /* White bal */
	{ 0x42, 0x80 },
	{ 0x43, 0x3f }, /* White bal */
	{ 0x44, 0x80 },
	{ 0x45, 0x20 },
	{ 0x46, 0x20 },
	{ 0x47, 0x80 },
	{ 0x48, 0x7f },
	{ 0x49, 0x00 },
	{ 0x4a, 0x00 },
	{ 0x4b, 0x80 },
	{ 0x4c, 0xd0 },
	{ 0x4d, 0x10 }, /* U = 0.563u, V = 0.714v */
	{ 0x4e, 0x40 },
	{ 0x4f, 0x07 }, /* UV avg., col. killer: max */
	{ 0x50, 0xff },
	{ 0x54, 0x23 }, /* Max AGC gain: 18dB */
	{ 0x55, 0xff },
	{ 0x56, 0x12 },
	{ 0x57, 0x81 },
	{ 0x58, 0x75 },
	{ 0x59, 0x01 }, /* AGC dark current comp.: +1 */
	{ 0x5a, 0x2c },
	{ 0x5b, 0x0f }, /* AWB chrominance levels */
	{ 0x5c, 0x10 },
	{ 0x3d, 0x80 },
	{ 0x27, 0xa6 },
	{ 0x12, 0x20 }, /* Toggle AWB */
	{ 0x12, 0x24 },
};

/* Lawrence Glaister <lg@jfm.bc.ca> reports:
 *
 * Register 0x0f in the 7610 has the following effects:
 *
 * 0x85 (AEC method 1): Best overall, good contrast range
 * 0x45 (AEC method 2): Very overexposed
 * 0xa5 (spec sheet default): Ok, but the black level is
 *	shifted resulting in loss of contrast
 * 0x05 (old driver setting): very overexposed, too much
 *	contrast
 */
static const struct ov_i2c_regvals norm_7610[] = {
	{ 0x10, 0xff },
	{ 0x16, 0x06 },
	{ 0x28, 0x24 },
	{ 0x2b, 0xac },
	{ 0x12, 0x00 },
	{ 0x38, 0x81 },
	{ 0x28, 0x24 },	/* 0c */
	{ 0x0f, 0x85 },	/* lg's setting */
	{ 0x15, 0x01 },
	{ 0x20, 0x1c },
	{ 0x23, 0x2a },
	{ 0x24, 0x10 },
	{ 0x25, 0x8a },
	{ 0x26, 0xa2 },
	{ 0x27, 0xc2 },
	{ 0x2a, 0x04 },
	{ 0x2c, 0xfe },
	{ 0x2d, 0x93 },
	{ 0x30, 0x71 },
	{ 0x31, 0x60 },
	{ 0x32, 0x26 },
	{ 0x33, 0x20 },
	{ 0x34, 0x48 },
	{ 0x12, 0x24 },
	{ 0x11, 0x01 },
	{ 0x0c, 0x24 },
	{ 0x0d, 0x24 },
};

static const struct ov_i2c_regvals norm_7620[] = {
	{ 0x00, 0x00 },		/* gain */
	{ 0x01, 0x80 },		/* blue gain */
	{ 0x02, 0x80 },		/* red gain */
	{ 0x03, 0xc0 },		/* OV7670_REG_VREF */
	{ 0x06, 0x60 },
	{ 0x07, 0x00 },
	{ 0x0c, 0x24 },
	{ 0x0c, 0x24 },
	{ 0x0d, 0x24 },
	{ 0x11, 0x01 },
	{ 0x12, 0x24 },
	{ 0x13, 0x01 },
	{ 0x14, 0x84 },
	{ 0x15, 0x01 },
	{ 0x16, 0x03 },
	{ 0x17, 0x2f },
	{ 0x18, 0xcf },
	{ 0x19, 0x06 },
	{ 0x1a, 0xf5 },
	{ 0x1b, 0x00 },
	{ 0x20, 0x18 },
	{ 0x21, 0x80 },
	{ 0x22, 0x80 },
	{ 0x23, 0x00 },
	{ 0x26, 0xa2 },
	{ 0x27, 0xea },
	{ 0x28, 0x20 },
	{ 0x29, 0x00 },
	{ 0x2a, 0x10 },
	{ 0x2b, 0x00 },
	{ 0x2c, 0x88 },
	{ 0x2d, 0x91 },
	{ 0x2e, 0x80 },
	{ 0x2f, 0x44 },
	{ 0x60, 0x27 },
	{ 0x61, 0x02 },
	{ 0x62, 0x5f },
	{ 0x63, 0xd5 },
	{ 0x64, 0x57 },
	{ 0x65, 0x83 },
	{ 0x66, 0x55 },
	{ 0x67, 0x92 },
	{ 0x68, 0xcf },
	{ 0x69, 0x76 },
	{ 0x6a, 0x22 },
	{ 0x6b, 0x00 },
	{ 0x6c, 0x02 },
	{ 0x6d, 0x44 },
	{ 0x6e, 0x80 },
	{ 0x6f, 0x1d },
	{ 0x70, 0x8b },
	{ 0x71, 0x00 },
	{ 0x72, 0x14 },
	{ 0x73, 0x54 },
	{ 0x74, 0x00 },
	{ 0x75, 0x8e },
	{ 0x76, 0x00 },
	{ 0x77, 0xff },
	{ 0x78, 0x80 },
	{ 0x79, 0x80 },
	{ 0x7a, 0x80 },
	{ 0x7b, 0xe2 },
	{ 0x7c, 0x00 },
};

/* 7640 and 7648. The defaults should be OK for most registers. */
static const struct ov_i2c_regvals norm_7640[] = {
	{ 0x12, 0x80 },
	{ 0x12, 0x14 },
};

/* 7670. Defaults taken from OmniVision provided data,
*  as provided by Jonathan Corbet of OLPC		*/
static const struct ov_i2c_regvals norm_7670[] = {
	{ OV7670_REG_COM7, OV7670_COM7_RESET },
	{ OV7670_REG_TSLB, 0x04 },		/* OV */
	{ OV7670_REG_COM7, OV7670_COM7_FMT_VGA }, /* VGA */
	{ OV7670_REG_CLKRC, 0x01 },
/*
 * Set the hardware window.  These values from OV don't entirely
 * make sense - hstop is less than hstart.  But they work...
 */
	{ OV7670_REG_HSTART, 0x13 },
	{ OV7670_REG_HSTOP, 0x01 },
	{ OV7670_REG_HREF, 0xb6 },
	{ OV7670_REG_VSTART, 0x02 },
	{ OV7670_REG_VSTOP, 0x7a },
	{ OV7670_REG_VREF, 0x0a },

	{ OV7670_REG_COM3, 0x00 },
	{ OV7670_REG_COM14, 0x00 },
/* Mystery scaling numbers */
	{ 0x70, 0x3a },
	{ 0x71, 0x35 },
	{ 0x72, 0x11 },
	{ 0x73, 0xf0 },
	{ 0xa2, 0x02 },
/*	{ OV7670_REG_COM10, 0x0 }, */

/* Gamma curve values */
	{ 0x7a, 0x20 },
	{ 0x7b, 0x10 },
	{ 0x7c, 0x1e },
	{ 0x7d, 0x35 },
	{ 0x7e, 0x5a },
	{ 0x7f, 0x69 },
	{ 0x80, 0x76 },
	{ 0x81, 0x80 },
	{ 0x82, 0x88 },
	{ 0x83, 0x8f },
	{ 0x84, 0x96 },
	{ 0x85, 0xa3 },
	{ 0x86, 0xaf },
	{ 0x87, 0xc4 },
	{ 0x88, 0xd7 },
	{ 0x89, 0xe8 },

/* AGC and AEC parameters.  Note we start by disabling those features,
   then turn them only after tweaking the values. */
	{ OV7670_REG_COM8, OV7670_COM8_FASTAEC
			 | OV7670_COM8_AECSTEP
			 | OV7670_COM8_BFILT },
	{ OV7670_REG_GAIN, 0x00 },
	{ OV7670_REG_AECH, 0x00 },
	{ OV7670_REG_COM4, 0x40 }, /* magic reserved bit */
	{ OV7670_REG_COM9, 0x18 }, /* 4x gain + magic rsvd bit */
	{ OV7670_REG_BD50MAX, 0x05 },
	{ OV7670_REG_BD60MAX, 0x07 },
	{ OV7670_REG_AEW, 0x95 },
	{ OV7670_REG_AEB, 0x33 },
	{ OV7670_REG_VPT, 0xe3 },
	{ OV7670_REG_HAECC1, 0x78 },
	{ OV7670_REG_HAECC2, 0x68 },
	{ 0xa1, 0x03 }, /* magic */
	{ OV7670_REG_HAECC3, 0xd8 },
	{ OV7670_REG_HAECC4, 0xd8 },
	{ OV7670_REG_HAECC5, 0xf0 },
	{ OV7670_REG_HAECC6, 0x90 },
	{ OV7670_REG_HAECC7, 0x94 },
	{ OV7670_REG_COM8, OV7670_COM8_FASTAEC
			| OV7670_COM8_AECSTEP
			| OV7670_COM8_BFILT
			| OV7670_COM8_AGC
			| OV7670_COM8_AEC },

/* Almost all of these are magic "reserved" values.  */
	{ OV7670_REG_COM5, 0x61 },
	{ OV7670_REG_COM6, 0x4b },
	{ 0x16, 0x02 },
	{ OV7670_REG_MVFP, 0x07 },
	{ 0x21, 0x02 },
	{ 0x22, 0x91 },
	{ 0x29, 0x07 },
	{ 0x33, 0x0b },
	{ 0x35, 0x0b },
	{ 0x37, 0x1d },
	{ 0x38, 0x71 },
	{ 0x39, 0x2a },
	{ OV7670_REG_COM12, 0x78 },
	{ 0x4d, 0x40 },
	{ 0x4e, 0x20 },
	{ OV7670_REG_GFIX, 0x00 },
	{ 0x6b, 0x4a },
	{ 0x74, 0x10 },
	{ 0x8d, 0x4f },
	{ 0x8e, 0x00 },
	{ 0x8f, 0x00 },
	{ 0x90, 0x00 },
	{ 0x91, 0x00 },
	{ 0x96, 0x00 },
	{ 0x9a, 0x00 },
	{ 0xb0, 0x84 },
	{ 0xb1, 0x0c },
	{ 0xb2, 0x0e },
	{ 0xb3, 0x82 },
	{ 0xb8, 0x0a },

/* More reserved magic, some of which tweaks white balance */
	{ 0x43, 0x0a },
	{ 0x44, 0xf0 },
	{ 0x45, 0x34 },
	{ 0x46, 0x58 },
	{ 0x47, 0x28 },
	{ 0x48, 0x3a },
	{ 0x59, 0x88 },
	{ 0x5a, 0x88 },
	{ 0x5b, 0x44 },
	{ 0x5c, 0x67 },
	{ 0x5d, 0x49 },
	{ 0x5e, 0x0e },
	{ 0x6c, 0x0a },
	{ 0x6d, 0x55 },
	{ 0x6e, 0x11 },
	{ 0x6f, 0x9f },
					/* "9e for advance AWB" */
	{ 0x6a, 0x40 },
	{ OV7670_REG_BLUE, 0x40 },
	{ OV7670_REG_RED, 0x60 },
	{ OV7670_REG_COM8, OV7670_COM8_FASTAEC
			| OV7670_COM8_AECSTEP
			| OV7670_COM8_BFILT
			| OV7670_COM8_AGC
			| OV7670_COM8_AEC
			| OV7670_COM8_AWB },

/* Matrix coefficients */
	{ 0x4f, 0x80 },
	{ 0x50, 0x80 },
	{ 0x51, 0x00 },
	{ 0x52, 0x22 },
	{ 0x53, 0x5e },
	{ 0x54, 0x80 },
	{ 0x58, 0x9e },

	{ OV7670_REG_COM16, OV7670_COM16_AWBGAIN },
	{ OV7670_REG_EDGE, 0x00 },
	{ 0x75, 0x05 },
	{ 0x76, 0xe1 },
	{ 0x4c, 0x00 },
	{ 0x77, 0x01 },
	{ OV7670_REG_COM13, OV7670_COM13_GAMMA
			  | OV7670_COM13_UVSAT
			  | 2},		/* was 3 */
	{ 0x4b, 0x09 },
	{ 0xc9, 0x60 },
	{ OV7670_REG_COM16, 0x38 },
	{ 0x56, 0x40 },

	{ 0x34, 0x11 },
	{ OV7670_REG_COM11, OV7670_COM11_EXP|OV7670_COM11_HZAUTO },
	{ 0xa4, 0x88 },
	{ 0x96, 0x00 },
	{ 0x97, 0x30 },
	{ 0x98, 0x20 },
	{ 0x99, 0x30 },
	{ 0x9a, 0x84 },
	{ 0x9b, 0x29 },
	{ 0x9c, 0x03 },
	{ 0x9d, 0x4c },
	{ 0x9e, 0x3f },
	{ 0x78, 0x04 },

/* Extra-weird stuff.  Some sort of multiplexor register */
	{ 0x79, 0x01 },
	{ 0xc8, 0xf0 },
	{ 0x79, 0x0f },
	{ 0xc8, 0x00 },
	{ 0x79, 0x10 },
	{ 0xc8, 0x7e },
	{ 0x79, 0x0a },
	{ 0xc8, 0x80 },
	{ 0x79, 0x0b },
	{ 0xc8, 0x01 },
	{ 0x79, 0x0c },
	{ 0xc8, 0x0f },
	{ 0x79, 0x0d },
	{ 0xc8, 0x20 },
	{ 0x79, 0x09 },
	{ 0xc8, 0x80 },
	{ 0x79, 0x02 },
	{ 0xc8, 0xc0 },
	{ 0x79, 0x03 },
	{ 0xc8, 0x40 },
	{ 0x79, 0x05 },
	{ 0xc8, 0x30 },
	{ 0x79, 0x26 },
};

static const struct ov_i2c_regvals norm_8610[] = {
	{ 0x12, 0x80 },
	{ 0x00, 0x00 },
	{ 0x01, 0x80 },
	{ 0x02, 0x80 },
	{ 0x03, 0xc0 },
	{ 0x04, 0x30 },
	{ 0x05, 0x30 }, /* was 0x10, new from windrv 090403 */
	{ 0x06, 0x70 }, /* was 0x80, new from windrv 090403 */
	{ 0x0a, 0x86 },
	{ 0x0b, 0xb0 },
	{ 0x0c, 0x20 },
	{ 0x0d, 0x20 },
	{ 0x11, 0x01 },
	{ 0x12, 0x25 },
	{ 0x13, 0x01 },
	{ 0x14, 0x04 },
	{ 0x15, 0x01 }, /* Lin and Win think different about UV order */
	{ 0x16, 0x03 },
	{ 0x17, 0x38 }, /* was 0x2f, new from windrv 090403 */
	{ 0x18, 0xea }, /* was 0xcf, new from windrv 090403 */
	{ 0x19, 0x02 }, /* was 0x06, new from windrv 090403 */
	{ 0x1a, 0xf5 },
	{ 0x1b, 0x00 },
	{ 0x20, 0xd0 }, /* was 0x90, new from windrv 090403 */
	{ 0x23, 0xc0 }, /* was 0x00, new from windrv 090403 */
	{ 0x24, 0x30 }, /* was 0x1d, new from windrv 090403 */
	{ 0x25, 0x50 }, /* was 0x57, new from windrv 090403 */
	{ 0x26, 0xa2 },
	{ 0x27, 0xea },
	{ 0x28, 0x00 },
	{ 0x29, 0x00 },
	{ 0x2a, 0x80 },
	{ 0x2b, 0xc8 }, /* was 0xcc, new from windrv 090403 */
	{ 0x2c, 0xac },
	{ 0x2d, 0x45 }, /* was 0xd5, new from windrv 090403 */
	{ 0x2e, 0x80 },
	{ 0x2f, 0x14 }, /* was 0x01, new from windrv 090403 */
	{ 0x4c, 0x00 },
	{ 0x4d, 0x30 }, /* was 0x10, new from windrv 090403 */
	{ 0x60, 0x02 }, /* was 0x01, new from windrv 090403 */
	{ 0x61, 0x00 }, /* was 0x09, new from windrv 090403 */
	{ 0x62, 0x5f }, /* was 0xd7, new from windrv 090403 */
	{ 0x63, 0xff },
	{ 0x64, 0x53 }, /* new windrv 090403 says 0x57,
			 * maybe thats wrong */
	{ 0x65, 0x00 },
	{ 0x66, 0x55 },
	{ 0x67, 0xb0 },
	{ 0x68, 0xc0 }, /* was 0xaf, new from windrv 090403 */
	{ 0x69, 0x02 },
	{ 0x6a, 0x22 },
	{ 0x6b, 0x00 },
	{ 0x6c, 0x99 }, /* was 0x80, old windrv says 0x00, but
			 * deleting bit7 colors the first images red */
	{ 0x6d, 0x11 }, /* was 0x00, new from windrv 090403 */
	{ 0x6e, 0x11 }, /* was 0x00, new from windrv 090403 */
	{ 0x6f, 0x01 },
	{ 0x70, 0x8b },
	{ 0x71, 0x00 },
	{ 0x72, 0x14 },
	{ 0x73, 0x54 },
	{ 0x74, 0x00 },/* 0x60? - was 0x00, new from windrv 090403 */
	{ 0x75, 0x0e },
	{ 0x76, 0x02 }, /* was 0x02, new from windrv 090403 */
	{ 0x77, 0xff },
	{ 0x78, 0x80 },
	{ 0x79, 0x80 },
	{ 0x7a, 0x80 },
	{ 0x7b, 0x10 }, /* was 0x13, new from windrv 090403 */
	{ 0x7c, 0x00 },
	{ 0x7d, 0x08 }, /* was 0x09, new from windrv 090403 */
	{ 0x7e, 0x08 }, /* was 0xc0, new from windrv 090403 */
	{ 0x7f, 0xfb },
	{ 0x80, 0x28 },
	{ 0x81, 0x00 },
	{ 0x82, 0x23 },
	{ 0x83, 0x0b },
	{ 0x84, 0x00 },
	{ 0x85, 0x62 }, /* was 0x61, new from windrv 090403 */
	{ 0x86, 0xc9 },
	{ 0x87, 0x00 },
	{ 0x88, 0x00 },
	{ 0x89, 0x01 },
	{ 0x12, 0x20 },
	{ 0x12, 0x25 }, /* was 0x24, new from windrv 090403 */
};

static unsigned char ov7670_abs_to_sm(unsigned char v)
{
	if (v > 127)
		return v & 0x7f;
	return (128 - v) | 0x80;
}

/* Write a OV519 register */
static int reg_w(struct sd *sd, __u16 index, __u8 value)
{
	int ret;

	sd->gspca_dev.usb_buf[0] = value;
	ret = usb_control_msg(sd->gspca_dev.dev,
			usb_sndctrlpipe(sd->gspca_dev.dev, 0),
			1,			/* REQ_IO (ov518/519) */
			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			0, index,
			sd->gspca_dev.usb_buf, 1, 500);
	if (ret < 0)
		PDEBUG(D_ERR, "Write reg [%02x] %02x failed", index, value);
	return ret;
}

/* Read from a OV519 register */
/* returns: negative is error, pos or zero is data */
static int reg_r(struct sd *sd, __u16 index)
{
	int ret;

	ret = usb_control_msg(sd->gspca_dev.dev,
			usb_rcvctrlpipe(sd->gspca_dev.dev, 0),
			1,			/* REQ_IO */
			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			0, index, sd->gspca_dev.usb_buf, 1, 500);

	if (ret >= 0)
		ret = sd->gspca_dev.usb_buf[0];
	else
		PDEBUG(D_ERR, "Read reg [0x%02x] failed", index);
	return ret;
}

/* Read 8 values from a OV519 register */
static int reg_r8(struct sd *sd,
		  __u16 index)
{
	int ret;

	ret = usb_control_msg(sd->gspca_dev.dev,
			usb_rcvctrlpipe(sd->gspca_dev.dev, 0),
			1,			/* REQ_IO */
			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			0, index, sd->gspca_dev.usb_buf, 8, 500);

	if (ret >= 0)
		ret = sd->gspca_dev.usb_buf[0];
	else
		PDEBUG(D_ERR, "Read reg 8 [0x%02x] failed", index);
	return ret;
}

/*
 * Writes bits at positions specified by mask to an OV51x reg. Bits that are in
 * the same position as 1's in "mask" are cleared and set to "value". Bits
 * that are in the same position as 0's in "mask" are preserved, regardless
 * of their respective state in "value".
 */
static int reg_w_mask(struct sd *sd,
			__u16 index,
			__u8 value,
			__u8 mask)
{
	int ret;
	__u8 oldval;

	if (mask != 0xff) {
		value &= mask;			/* Enforce mask on value */
		ret = reg_r(sd, index);
		if (ret < 0)
			return ret;

		oldval = ret & ~mask;		/* Clear the masked bits */
		value |= oldval;		/* Set the desired bits */
	}
	return reg_w(sd, index, value);
}

/*
 * The OV518 I2C I/O procedure is different, hence, this function.
 * This is normally only called from i2c_w(). Note that this function
 * always succeeds regardless of whether the sensor is present and working.
 */
static int i2c_w(struct sd *sd,
		__u8 reg,
		__u8 value)
{
	int rc;

	PDEBUG(D_USBO, "i2c 0x%02x -> [0x%02x]", value, reg);

	/* Select camera register */
	rc = reg_w(sd, R51x_I2C_SADDR_3, reg);
	if (rc < 0)
		return rc;

	/* Write "value" to I2C data port of OV511 */
	rc = reg_w(sd, R51x_I2C_DATA, value);
	if (rc < 0)
		return rc;

	/* Initiate 3-byte write cycle */
	rc = reg_w(sd, R518_I2C_CTL, 0x01);
	if (rc < 0)
		return rc;

	/* wait for write complete */
	msleep(4);
	return reg_r8(sd, R518_I2C_CTL);
}

/*
 * returns: negative is error, pos or zero is data
 *
 * The OV518 I2C I/O procedure is different, hence, this function.
 * This is normally only called from i2c_r(). Note that this function
 * always succeeds regardless of whether the sensor is present and working.
 */
static int i2c_r(struct sd *sd, __u8 reg)
{
	int rc, value;

	/* Select camera register */
	rc = reg_w(sd, R51x_I2C_SADDR_2, reg);
	if (rc < 0)
		return rc;

	/* Initiate 2-byte write cycle */
	rc = reg_w(sd, R518_I2C_CTL, 0x03);
	if (rc < 0)
		return rc;

	/* Initiate 2-byte read cycle */
	rc = reg_w(sd, R518_I2C_CTL, 0x05);
	if (rc < 0)
		return rc;
	value = reg_r(sd, R51x_I2C_DATA);
	PDEBUG(D_USBI, "i2c [0x%02X] -> 0x%02X", reg, value);
	return value;
}

/* Writes bits at positions specified by mask to an I2C reg. Bits that are in
 * the same position as 1's in "mask" are cleared and set to "value". Bits
 * that are in the same position as 0's in "mask" are preserved, regardless
 * of their respective state in "value".
 */
static int i2c_w_mask(struct sd *sd,
		   __u8 reg,
		   __u8 value,
		   __u8 mask)
{
	int rc;
	__u8 oldval;

	value &= mask;			/* Enforce mask on value */
	rc = i2c_r(sd, reg);
	if (rc < 0)
		return rc;
	oldval = rc & ~mask;		/* Clear the masked bits */
	value |= oldval;		/* Set the desired bits */
	return i2c_w(sd, reg, value);
}

/* Temporarily stops OV511 from functioning. Must do this before changing
 * registers while the camera is streaming */
static inline int ov51x_stop(struct sd *sd)
{
	PDEBUG(D_STREAM, "stopping");
	sd->stopped = 1;
	return reg_w(sd, OV519_SYS_RESET1, 0x0f);
}

/* Restarts OV511 after ov511_stop() is called. Has no effect if it is not
 * actually stopped (for performance). */
static inline int ov51x_restart(struct sd *sd)
{
	PDEBUG(D_STREAM, "restarting");
	if (!sd->stopped)
		return 0;
	sd->stopped = 0;

	/* Reinitialize the stream */
	return reg_w(sd, OV519_SYS_RESET1, 0x00);
}

/* This does an initial reset of an OmniVision sensor and ensures that I2C
 * is synchronized. Returns <0 on failure.
 */
static int init_ov_sensor(struct sd *sd)
{
	int i;

	/* Reset the sensor */
	if (i2c_w(sd, 0x12, 0x80) < 0)
		return -EIO;

	/* Wait for it to initialize */
	msleep(150);

	for (i = 0; i < i2c_detect_tries; i++) {
		if (i2c_r(sd, OV7610_REG_ID_HIGH) == 0x7f &&
		    i2c_r(sd, OV7610_REG_ID_LOW) == 0xa2) {
			PDEBUG(D_PROBE, "I2C synced in %d attempt(s)", i);
			return 0;
		}

		/* Reset the sensor */
		if (i2c_w(sd, 0x12, 0x80) < 0)
			return -EIO;
		/* Wait for it to initialize */
		msleep(150);
		/* Dummy read to sync I2C */
		if (i2c_r(sd, 0x00) < 0)
			return -EIO;
	}
	return -EIO;
}

/* Set the read and write slave IDs. The "slave" argument is the write slave,
 * and the read slave will be set to (slave + 1).
 * This should not be called from outside the i2c I/O functions.
 * Sets I2C read and write slave IDs. Returns <0 for error
 */
static int ov51x_set_slave_ids(struct sd *sd,
				__u8 slave)
{
	int rc;

	rc = reg_w(sd, R51x_I2C_W_SID, slave);
	if (rc < 0)
		return rc;
	return reg_w(sd, R51x_I2C_R_SID, slave + 1);
}

static int write_regvals(struct sd *sd,
			 const struct ov_regvals *regvals,
			 int n)
{
	int rc;

	while (--n >= 0) {
		rc = reg_w(sd, regvals->reg, regvals->val);
		if (rc < 0)
			return rc;
		regvals++;
	}
	return 0;
}

static int write_i2c_regvals(struct sd *sd,
			     const struct ov_i2c_regvals *regvals,
			     int n)
{
	int rc;

	while (--n >= 0) {
		rc = i2c_w(sd, regvals->reg, regvals->val);
		if (rc < 0)
			return rc;
		regvals++;
	}
	return 0;
}

/****************************************************************************
 *
 * OV511 and sensor configuration
 *
 ***************************************************************************/

/* This initializes the OV8110, OV8610 sensor. The OV8110 uses
 * the same register settings as the OV8610, since they are very similar.
 */
static int ov8xx0_configure(struct sd *sd)
{
	int rc;

	PDEBUG(D_PROBE, "starting ov8xx0 configuration");

	/* Detect sensor (sub)type */
	rc = i2c_r(sd, OV7610_REG_COM_I);
	if (rc < 0) {
		PDEBUG(D_ERR, "Error detecting sensor type");
		return -1;
	}
	if ((rc & 3) == 1) {
		sd->sensor = SEN_OV8610;
	} else {
		PDEBUG(D_ERR, "Unknown image sensor version: %d", rc & 3);
		return -1;
	}

	/* Set sensor-specific vars */
/*	sd->sif = 0;		already done */
	return 0;
}

/* This initializes the OV7610, OV7620, or OV76BE sensor. The OV76BE uses
 * the same register settings as the OV7610, since they are very similar.
 */
static int ov7xx0_configure(struct sd *sd)
{
	int rc, high, low;


	PDEBUG(D_PROBE, "starting OV7xx0 configuration");

	/* Detect sensor (sub)type */
	rc = i2c_r(sd, OV7610_REG_COM_I);

	/* add OV7670 here
	 * it appears to be wrongly detected as a 7610 by default */
	if (rc < 0) {
		PDEBUG(D_ERR, "Error detecting sensor type");
		return -1;
	}
	if ((rc & 3) == 3) {
		/* quick hack to make OV7670s work */
		high = i2c_r(sd, 0x0a);
		low = i2c_r(sd, 0x0b);
		/* info("%x, %x", high, low); */
		if (high == 0x76 && low == 0x73) {
			PDEBUG(D_PROBE, "Sensor is an OV7670");
			sd->sensor = SEN_OV7670;
		} else {
			PDEBUG(D_PROBE, "Sensor is an OV7610");
			sd->sensor = SEN_OV7610;
		}
	} else if ((rc & 3) == 1) {
		/* I don't know what's different about the 76BE yet. */
		if (i2c_r(sd, 0x15) & 1)
			PDEBUG(D_PROBE, "Sensor is an OV7620AE");
		else
			PDEBUG(D_PROBE, "Sensor is an OV76BE");

		/* OV511+ will return all zero isoc data unless we
		 * configure the sensor as a 7620. Someone needs to
		 * find the exact reg. setting that causes this. */
		sd->sensor = SEN_OV76BE;
	} else if ((rc & 3) == 0) {
		/* try to read product id registers */
		high = i2c_r(sd, 0x0a);
		if (high < 0) {
			PDEBUG(D_ERR, "Error detecting camera chip PID");
			return high;
		}
		low = i2c_r(sd, 0x0b);
		if (low < 0) {
			PDEBUG(D_ERR, "Error detecting camera chip VER");
			return low;
		}
		if (high == 0x76) {
			switch (low) {
			case 0x30:
				PDEBUG(D_PROBE, "Sensor is an OV7630/OV7635");
				PDEBUG(D_ERR,
				      "7630 is not supported by this driver");
				return -1;
			case 0x40:
				PDEBUG(D_PROBE, "Sensor is an OV7645");
				sd->sensor = SEN_OV7640; /* FIXME */
				break;
			case 0x45:
				PDEBUG(D_PROBE, "Sensor is an OV7645B");
				sd->sensor = SEN_OV7640; /* FIXME */
				break;
			case 0x48:
				PDEBUG(D_PROBE, "Sensor is an OV7648");
				sd->sensor = SEN_OV7640; /* FIXME */
				break;
			default:
				PDEBUG(D_PROBE, "Unknown sensor: 0x76%x", low);
				return -1;
			}
		} else {
			PDEBUG(D_PROBE, "Sensor is an OV7620");
			sd->sensor = SEN_OV7620;
		}
	} else {
		PDEBUG(D_ERR, "Unknown image sensor version: %d", rc & 3);
		return -1;
	}

	/* Set sensor-specific vars */
/*	sd->sif = 0;		already done */
	return 0;
}

/* This initializes the OV6620, OV6630, OV6630AE, or OV6630AF sensor. */
static int ov6xx0_configure(struct sd *sd)
{
	int rc;
	PDEBUG(D_PROBE, "starting OV6xx0 configuration");

	/* Detect sensor (sub)type */
	rc = i2c_r(sd, OV7610_REG_COM_I);
	if (rc < 0) {
		PDEBUG(D_ERR, "Error detecting sensor type");
		return -1;
	}

	/* Ugh. The first two bits are the version bits, but
	 * the entire register value must be used. I guess OVT
	 * underestimated how many variants they would make. */
	switch (rc) {
	case 0x00:
		sd->sensor = SEN_OV6630;
		PDEBUG(D_ERR,
			"WARNING: Sensor is an OV66308. Your camera may have");
		PDEBUG(D_ERR, "been misdetected in previous driver versions.");
		break;
	case 0x01:
		sd->sensor = SEN_OV6620;
		break;
	case 0x02:
		sd->sensor = SEN_OV6630;
		PDEBUG(D_PROBE, "Sensor is an OV66308AE");
		break;
	case 0x03:
		sd->sensor = SEN_OV6630;
		PDEBUG(D_PROBE, "Sensor is an OV66308AF");
		break;
	case 0x90:
		sd->sensor = SEN_OV6630;
		PDEBUG(D_ERR,
			"WARNING: Sensor is an OV66307. Your camera may have");
		PDEBUG(D_ERR, "been misdetected in previous driver versions.");
		break;
	default:
		PDEBUG(D_ERR, "FATAL: Unknown sensor version: 0x%02x", rc);
		return -1;
	}

	/* Set sensor-specific vars */
	sd->sif = 1;

	return 0;
}

/* Turns on or off the LED. Only has an effect with OV511+/OV518(+)/OV519 */
static void ov51x_led_control(struct sd *sd, int on)
{
	reg_w_mask(sd, OV519_GPIO_DATA_OUT0, !on, 1);	/* 0 / 1 */
}

/* this function is called at probe time */
static int sd_config(struct gspca_dev *gspca_dev,
			const struct usb_device_id *id)
{
	struct sd *sd = (struct sd *) gspca_dev;
	struct cam *cam;

	static const struct ov_regvals init_519[] = {
		{ 0x5a,  0x6d }, /* EnableSystem */
		{ 0x53,  0x9b },
		{ 0x54,  0xff }, /* set bit2 to enable jpeg */
		{ 0x5d,  0x03 },
		{ 0x49,  0x01 },
		{ 0x48,  0x00 },
		/* Set LED pin to output mode. Bit 4 must be cleared or sensor
		 * detection will fail. This deserves further investigation. */
		{ OV519_GPIO_IO_CTRL0,   0xee },
		{ 0x51,  0x0f }, /* SetUsbInit */
		{ 0x51,  0x00 },
		{ 0x22,  0x00 },
		/* windows reads 0x55 at this point*/
	};

	if (write_regvals(sd, init_519, ARRAY_SIZE(init_519)))
		goto error;
	ov51x_led_control(sd, 0);	/* turn LED off */

	/* Test for 76xx */
	if (ov51x_set_slave_ids(sd, OV7xx0_SID) < 0)
		goto error;

	/* The OV519 must be more aggressive about sensor detection since
	 * I2C write will never fail if the sensor is not present. We have
	 * to try to initialize the sensor to detect its presence */
	if (init_ov_sensor(sd) >= 0) {
		if (ov7xx0_configure(sd) < 0) {
			PDEBUG(D_ERR, "Failed to configure OV7xx0");
			goto error;
		}
	} else {

		/* Test for 6xx0 */
		if (ov51x_set_slave_ids(sd, OV6xx0_SID) < 0)
			goto error;

		if (init_ov_sensor(sd) >= 0) {
			if (ov6xx0_configure(sd) < 0) {
				PDEBUG(D_ERR, "Failed to configure OV6xx0");
				goto error;
			}
		} else {

			/* Test for 8xx0 */
			if (ov51x_set_slave_ids(sd, OV8xx0_SID) < 0)
				goto error;

			if (init_ov_sensor(sd) < 0) {
				PDEBUG(D_ERR,
					"Can't determine sensor slave IDs");
				goto error;
			}
			if (ov8xx0_configure(sd) < 0) {
				PDEBUG(D_ERR,
					"Failed to configure OV8xx0 sensor");
				goto error;
			}
		}
	}

	cam = &gspca_dev->cam;
	cam->epaddr = OV511_ENDPOINT_ADDRESS;
	if (!sd->sif) {
		cam->cam_mode = vga_mode;
		cam->nmodes = ARRAY_SIZE(vga_mode);
	} else {
		cam->cam_mode = sif_mode;
		cam->nmodes = ARRAY_SIZE(sif_mode);
	}
	sd->brightness = BRIGHTNESS_DEF;
	sd->contrast = CONTRAST_DEF;
	sd->colors = COLOR_DEF;
	sd->hflip = HFLIP_DEF;
	sd->vflip = VFLIP_DEF;
	if (sd->sensor != SEN_OV7670)
		gspca_dev->ctrl_dis = (1 << HFLIP_IDX)
					| (1 << VFLIP_IDX);
	return 0;
error:
	PDEBUG(D_ERR, "OV519 Config failed");
	return -EBUSY;
}

/* this function is called at probe and resume time */
static int sd_init(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;

	/* initialize the sensor */
	switch (sd->sensor) {
	case SEN_OV6620:
		if (write_i2c_regvals(sd, norm_6x20, ARRAY_SIZE(norm_6x20)))
			return -EIO;
		break;
	case SEN_OV6630:
		if (write_i2c_regvals(sd, norm_6x30, ARRAY_SIZE(norm_6x30)))
			return -EIO;
		break;
	default:
/*	case SEN_OV7610: */
/*	case SEN_OV76BE: */
		if (write_i2c_regvals(sd, norm_7610, ARRAY_SIZE(norm_7610)))
			return -EIO;
		break;
	case SEN_OV7620:
		if (write_i2c_regvals(sd, norm_7620, ARRAY_SIZE(norm_7620)))
			return -EIO;
		break;
	case SEN_OV7640:
		if (write_i2c_regvals(sd, norm_7640, ARRAY_SIZE(norm_7640)))
			return -EIO;
		break;
	case SEN_OV7670:
		if (write_i2c_regvals(sd, norm_7670, ARRAY_SIZE(norm_7670)))
			return -EIO;
		break;
	case SEN_OV8610:
		if (write_i2c_regvals(sd, norm_8610, ARRAY_SIZE(norm_8610)))
			return -EIO;
		break;
	}
	return 0;
}

/* Sets up the OV519 with the given image parameters
 *
 * OV519 needs a completely different approach, until we can figure out what
 * the individual registers do.
 *
 * Do not put any sensor-specific code in here (including I2C I/O functions)
 */
static int ov519_mode_init_regs(struct sd *sd)
{
	static const struct ov_regvals mode_init_519_ov7670[] = {
		{ 0x5d,	0x03 }, /* Turn off suspend mode */
		{ 0x53,	0x9f }, /* was 9b in 1.65-1.08 */
		{ 0x54,	0x0f }, /* bit2 (jpeg enable) */
		{ 0xa2,	0x20 }, /* a2-a5 are undocumented */
		{ 0xa3,	0x18 },
		{ 0xa4,	0x04 },
		{ 0xa5,	0x28 },
		{ 0x37,	0x00 },	/* SetUsbInit */
		{ 0x55,	0x02 }, /* 4.096 Mhz audio clock */
		/* Enable both fields, YUV Input, disable defect comp (why?) */
		{ 0x20,	0x0c },
		{ 0x21,	0x38 },
		{ 0x22,	0x1d },
		{ 0x17,	0x50 }, /* undocumented */
		{ 0x37,	0x00 }, /* undocumented */
		{ 0x40,	0xff }, /* I2C timeout counter */
		{ 0x46,	0x00 }, /* I2C clock prescaler */
		{ 0x59,	0x04 },	/* new from windrv 090403 */
		{ 0xff,	0x00 }, /* undocumented */
		/* windows reads 0x55 at this point, why? */
	};

	static const struct ov_regvals mode_init_519[] = {
		{ 0x5d,	0x03 }, /* Turn off suspend mode */
		{ 0x53,	0x9f }, /* was 9b in 1.65-1.08 */
		{ 0x54,	0x0f }, /* bit2 (jpeg enable) */
		{ 0xa2,	0x20 }, /* a2-a5 are undocumented */
		{ 0xa3,	0x18 },
		{ 0xa4,	0x04 },
		{ 0xa5,	0x28 },
		{ 0x37,	0x00 },	/* SetUsbInit */
		{ 0x55,	0x02 }, /* 4.096 Mhz audio clock */
		/* Enable both fields, YUV Input, disable defect comp (why?) */
		{ 0x22,	0x1d },
		{ 0x17,	0x50 }, /* undocumented */
		{ 0x37,	0x00 }, /* undocumented */
		{ 0x40,	0xff }, /* I2C timeout counter */
		{ 0x46,	0x00 }, /* I2C clock prescaler */
		{ 0x59,	0x04 },	/* new from windrv 090403 */
		{ 0xff,	0x00 }, /* undocumented */
		/* windows reads 0x55 at this point, why? */
	};

	/******** Set the mode ********/
	if (sd->sensor != SEN_OV7670) {
		if (write_regvals(sd, mode_init_519,
				  ARRAY_SIZE(mode_init_519)))
			return -EIO;
		if (sd->sensor == SEN_OV7640) {
			/* Select 8-bit input mode */
			reg_w_mask(sd, OV519_R20_DFR, 0x10, 0x10);
		}
	} else {
		if (write_regvals(sd, mode_init_519_ov7670,
				  ARRAY_SIZE(mode_init_519_ov7670)))
			return -EIO;
	}

	reg_w(sd, OV519_R10_H_SIZE,	sd->gspca_dev.width >> 4);
	reg_w(sd, OV519_R11_V_SIZE,	sd->gspca_dev.height >> 3);
	reg_w(sd, OV519_R12_X_OFFSETL,	0x00);
	reg_w(sd, OV519_R13_X_OFFSETH,	0x00);
	reg_w(sd, OV519_R14_Y_OFFSETL,	0x00);
	reg_w(sd, OV519_R15_Y_OFFSETH,	0x00);
	reg_w(sd, OV519_R16_DIVIDER,	0x00);
	reg_w(sd, OV519_R25_FORMAT,	0x03); /* YUV422 */
	reg_w(sd, 0x26,			0x00); /* Undocumented */

	/******** Set the framerate ********/
	if (frame_rate > 0)
		sd->frame_rate = frame_rate;

/* FIXME: These are only valid at the max resolution. */
	sd->clockdiv = 0;
	switch (sd->sensor) {
	case SEN_OV7640:
		switch (sd->frame_rate) {
		default:
/*		case 30: */
			reg_w(sd, 0xa4, 0x0c);
			reg_w(sd, 0x23, 0xff);
			break;
		case 25:
			reg_w(sd, 0xa4, 0x0c);
			reg_w(sd, 0x23, 0x1f);
			break;
		case 20:
			reg_w(sd, 0xa4, 0x0c);
			reg_w(sd, 0x23, 0x1b);
			break;
		case 15:
			reg_w(sd, 0xa4, 0x04);
			reg_w(sd, 0x23, 0xff);
			sd->clockdiv = 1;
			break;
		case 10:
			reg_w(sd, 0xa4, 0x04);
			reg_w(sd, 0x23, 0x1f);
			sd->clockdiv = 1;
			break;
		case 5:
			reg_w(sd, 0xa4, 0x04);
			reg_w(sd, 0x23, 0x1b);
			sd->clockdiv = 1;
			break;
		}
		break;
	case SEN_OV8610:
		switch (sd->frame_rate) {
		default:	/* 15 fps */
/*		case 15: */
			reg_w(sd, 0xa4, 0x06);
			reg_w(sd, 0x23, 0xff);
			break;
		case 10:
			reg_w(sd, 0xa4, 0x06);
			reg_w(sd, 0x23, 0x1f);
			break;
		case 5:
			reg_w(sd, 0xa4, 0x06);
			reg_w(sd, 0x23, 0x1b);
			break;
		}
		break;
	case SEN_OV7670:		/* guesses, based on 7640 */
		PDEBUG(D_STREAM, "Setting framerate to %d fps",
				 (sd->frame_rate == 0) ? 15 : sd->frame_rate);
		reg_w(sd, 0xa4, 0x10);
		switch (sd->frame_rate) {
		case 30:
			reg_w(sd, 0x23, 0xff);
			break;
		case 20:
			reg_w(sd, 0x23, 0x1b);
			break;
		default:
/*		case 15: */
			reg_w(sd, 0x23, 0xff);
			sd->clockdiv = 1;
			break;
		}
		break;
	}
	return 0;
}

static int mode_init_ov_sensor_regs(struct sd *sd)
{
	struct gspca_dev *gspca_dev;
	int qvga;

	gspca_dev = &sd->gspca_dev;
	qvga = gspca_dev->cam.cam_mode[(int) gspca_dev->curr_mode].priv;

	/******** Mode (VGA/QVGA) and sensor specific regs ********/
	switch (sd->sensor) {
	case SEN_OV8610:
		/* For OV8610 qvga means qsvga */
		i2c_w_mask(sd, OV7610_REG_COM_C, qvga ? (1 << 5) : 0, 1 << 5);
		break;
	case SEN_OV7610:
		i2c_w_mask(sd, 0x14, qvga ? 0x20 : 0x00, 0x20);
		break;
	case SEN_OV7620:
/*		i2c_w(sd, 0x2b, 0x00); */
		i2c_w_mask(sd, 0x14, qvga ? 0x20 : 0x00, 0x20);
		i2c_w_mask(sd, 0x28, qvga ? 0x00 : 0x20, 0x20);
		i2c_w(sd, 0x24, qvga ? 0x20 : 0x3a);
		i2c_w(sd, 0x25, qvga ? 0x30 : 0x60);
		i2c_w_mask(sd, 0x2d, qvga ? 0x40 : 0x00, 0x40);
		i2c_w_mask(sd, 0x67, qvga ? 0xf0 : 0x90, 0xf0);
		i2c_w_mask(sd, 0x74, qvga ? 0x20 : 0x00, 0x20);
		break;
	case SEN_OV76BE:
/*		i2c_w(sd, 0x2b, 0x00); */
		i2c_w_mask(sd, 0x14, qvga ? 0x20 : 0x00, 0x20);
		break;
	case SEN_OV7640:
/*		i2c_w(sd, 0x2b, 0x00); */
		i2c_w_mask(sd, 0x14, qvga ? 0x20 : 0x00, 0x20);
		i2c_w_mask(sd, 0x28, qvga ? 0x00 : 0x20, 0x20);
/*		i2c_w(sd, 0x24, qvga ? 0x20 : 0x3a); */
/*		i2c_w(sd, 0x25, qvga ? 0x30 : 0x60); */
/*		i2c_w_mask(sd, 0x2d, qvga ? 0x40 : 0x00, 0x40); */
/*		i2c_w_mask(sd, 0x67, qvga ? 0xf0 : 0x90, 0xf0); */
/*		i2c_w_mask(sd, 0x74, qvga ? 0x20 : 0x00, 0x20); */
		break;
	case SEN_OV7670:
		/* set COM7_FMT_VGA or COM7_FMT_QVGA
		 * do we need to set anything else?
		 *	HSTART etc are set in set_ov_sensor_window itself */
		i2c_w_mask(sd, OV7670_REG_COM7,
			 qvga ? OV7670_COM7_FMT_QVGA : OV7670_COM7_FMT_VGA,
			 OV7670_COM7_FMT_MASK);
		break;
	case SEN_OV6620:
	case SEN_OV6630:
		i2c_w_mask(sd, 0x14, qvga ? 0x20 : 0x00, 0x20);
		break;
	default:
		return -EINVAL;
	}

	/******** Palette-specific regs ********/
	if (sd->sensor == SEN_OV7610 || sd->sensor == SEN_OV76BE) {
		/* not valid on the OV6620/OV7620/6630? */
		i2c_w_mask(sd, 0x0e, 0x00, 0x40);
	}

	/* The OV518 needs special treatment. Although both the OV518
	 * and the OV6630 support a 16-bit video bus, only the 8 bit Y
	 * bus is actually used. The UV bus is tied to ground.
	 * Therefore, the OV6630 needs to be in 8-bit multiplexed
	 * output mode */

	/* OV7640 is 8-bit only */

	if (sd->sensor != SEN_OV6630 && sd->sensor != SEN_OV7640)
		i2c_w_mask(sd, 0x13, 0x00, 0x20);

	/******** Clock programming ********/
	/* The OV6620 needs special handling. This prevents the
	 * severe banding that normally occurs */
	if (sd->sensor == SEN_OV6620) {

		/* Clock down */
		i2c_w(sd, 0x2a, 0x04);
		i2c_w(sd, 0x11, sd->clockdiv);
		i2c_w(sd, 0x2a, 0x84);
		/* This next setting is critical. It seems to improve
		 * the gain or the contrast. The "reserved" bits seem
		 * to have some effect in this case. */
		i2c_w(sd, 0x2d, 0x85);
	} else {
		i2c_w(sd, 0x11, sd->clockdiv);
	}

	/******** Special Features ********/
/* no evidence this is possible with OV7670, either */
	/* Test Pattern */
	if (sd->sensor != SEN_OV7640 && sd->sensor != SEN_OV7670)
		i2c_w_mask(sd, 0x12, 0x00, 0x02);

	/* Enable auto white balance */
	if (sd->sensor == SEN_OV7670)
		i2c_w_mask(sd, OV7670_REG_COM8, OV7670_COM8_AWB,
				OV7670_COM8_AWB);
	else
		i2c_w_mask(sd, 0x12, 0x04, 0x04);

	/* This will go away as soon as ov51x_mode_init_sensor_regs() */
	/* is fully tested. */
	/* 7620/6620/6630? don't have register 0x35, so play it safe */
	if (sd->sensor == SEN_OV7610 || sd->sensor == SEN_OV76BE) {
		if (!qvga)
			i2c_w(sd, 0x35, 0x9e);
		else
			i2c_w(sd, 0x35, 0x1e);
	}
	return 0;
}

static void sethvflip(struct sd *sd)
{
	if (sd->sensor != SEN_OV7670)
		return;
	if (sd->gspca_dev.streaming)
		ov51x_stop(sd);
	i2c_w_mask(sd, OV7670_REG_MVFP,
		OV7670_MVFP_MIRROR * sd->hflip
			| OV7670_MVFP_VFLIP * sd->vflip,
		OV7670_MVFP_MIRROR | OV7670_MVFP_VFLIP);
	if (sd->gspca_dev.streaming)
		ov51x_restart(sd);
}

static int set_ov_sensor_window(struct sd *sd)
{
	struct gspca_dev *gspca_dev;
	int qvga;
	int hwsbase, hwebase, vwsbase, vwebase, hwscale, vwscale;
	int ret, hstart, hstop, vstop, vstart;
	__u8 v;

	gspca_dev = &sd->gspca_dev;
	qvga = gspca_dev->cam.cam_mode[(int) gspca_dev->curr_mode].priv;

	/* The different sensor ICs handle setting up of window differently.
	 * IF YOU SET IT WRONG, YOU WILL GET ALL ZERO ISOC DATA FROM OV51x!! */
	switch (sd->sensor) {
	case SEN_OV8610:
		hwsbase = 0x1e;
		hwebase = 0x1e;
		vwsbase = 0x02;
		vwebase = 0x02;
		break;
	case SEN_OV7610:
	case SEN_OV76BE:
		hwsbase = 0x38;
		hwebase = 0x3a;
		vwsbase = vwebase = 0x05;
		break;
	case SEN_OV6620:
	case SEN_OV6630:
		hwsbase = 0x38;
		hwebase = 0x3a;
		vwsbase = 0x05;
		vwebase = 0x06;
		break;
	case SEN_OV7620:
		hwsbase = 0x2f;		/* From 7620.SET (spec is wrong) */
		hwebase = 0x2f;
		vwsbase = vwebase = 0x05;
		break;
	case SEN_OV7640:
		hwsbase = 0x1a;
		hwebase = 0x1a;
		vwsbase = vwebase = 0x03;
		break;
	case SEN_OV7670:
		/*handling of OV7670 hardware sensor start and stop values
		 * is very odd, compared to the other OV sensors */
		vwsbase = vwebase = hwebase = hwsbase = 0x00;
		break;
	default:
		return -EINVAL;
	}

	switch (sd->sensor) {
	case SEN_OV6620:
	case SEN_OV6630:
		if (qvga) {		/* QCIF */
			hwscale = 0;
			vwscale = 0;
		} else {		/* CIF */
			hwscale = 1;
			vwscale = 1;	/* The datasheet says 0;
					 * it's wrong */
		}
		break;
	case SEN_OV8610:
		if (qvga) {		/* QSVGA */
			hwscale = 1;
			vwscale = 1;
		} else {		/* SVGA */
			hwscale = 2;
			vwscale = 2;
		}
		break;
	default:			/* SEN_OV7xx0 */
		if (qvga) {		/* QVGA */
			hwscale = 1;
			vwscale = 0;
		} else {		/* VGA */
			hwscale = 2;
			vwscale = 1;
		}
	}

	ret = mode_init_ov_sensor_regs(sd);
	if (ret < 0)
		return ret;

	if (sd->sensor == SEN_OV8610) {
		i2c_w_mask(sd, 0x2d, 0x05, 0x40);
				/* old 0x95, new 0x05 from windrv 090403 */
						/* bits 5-7: reserved */
		i2c_w_mask(sd, 0x28, 0x20, 0x20);
					/* bit 5: progressive mode on */
	}

	/* The below is wrong for OV7670s because their window registers
	 * only store the high bits in 0x17 to 0x1a */

	/* SRH Use sd->max values instead of requested win values */
	/* SCS Since we're sticking with only the max hardware widths
	 * for a given mode */
	/* I can hard code this for OV7670s */
	/* Yes, these numbers do look odd, but they're tested and work! */
	if (sd->sensor == SEN_OV7670) {
		if (qvga) {		/* QVGA from ov7670.c by
					 * Jonathan Corbet */
			hstart = 164;
			hstop = 20;
			vstart = 14;
			vstop = 494;
		} else {		/* VGA */
			hstart = 158;
			hstop = 14;
			vstart = 10;
			vstop = 490;
		}
		/* OV7670 hardware window registers are split across
		 * multiple locations */
		i2c_w(sd, OV7670_REG_HSTART, hstart >> 3);
		i2c_w(sd, OV7670_REG_HSTOP, hstop >> 3);
		v = i2c_r(sd, OV7670_REG_HREF);
		v = (v & 0xc0) | ((hstop & 0x7) << 3) | (hstart & 0x07);
		msleep(10);	/* need to sleep between read and write to
				 * same reg! */
		i2c_w(sd, OV7670_REG_HREF, v);

		i2c_w(sd, OV7670_REG_VSTART, vstart >> 2);
		i2c_w(sd, OV7670_REG_VSTOP, vstop >> 2);
		v = i2c_r(sd, OV7670_REG_VREF);
		v = (v & 0xc0) | ((vstop & 0x3) << 2) | (vstart & 0x03);
		msleep(10);	/* need to sleep between read and write to
				 * same reg! */
		i2c_w(sd, OV7670_REG_VREF, v);
		sethvflip(sd);
	} else {
		i2c_w(sd, 0x17, hwsbase);
		i2c_w(sd, 0x18, hwebase + (sd->gspca_dev.width >> hwscale));
		i2c_w(sd, 0x19, vwsbase);
		i2c_w(sd, 0x1a, vwebase + (sd->gspca_dev.height >> vwscale));
	}
	return 0;
}

/* -- start the camera -- */
static int sd_start(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int ret;

	ret = ov519_mode_init_regs(sd);
	if (ret < 0)
		goto out;
	ret = set_ov_sensor_window(sd);
	if (ret < 0)
		goto out;

	ret = ov51x_restart(sd);
	if (ret < 0)
		goto out;
	ov51x_led_control(sd, 1);
	return 0;
out:
	PDEBUG(D_ERR, "camera start error:%d", ret);
	return ret;
}

static void sd_stopN(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;

	ov51x_stop(sd);
	ov51x_led_control(sd, 0);
}

static void sd_pkt_scan(struct gspca_dev *gspca_dev,
			struct gspca_frame *frame,	/* target */
			__u8 *data,			/* isoc packet */
			int len)			/* iso packet length */
{
	/* Header of ov519 is 16 bytes:
	 *     Byte     Value      Description
	 *	0	0xff	magic
	 *	1	0xff	magic
	 *	2	0xff	magic
	 *	3	0xXX	0x50 = SOF, 0x51 = EOF
	 *	9	0xXX	0x01 initial frame without data,
	 *			0x00 standard frame with image
	 *	14	Lo	in EOF: length of image data / 8
	 *	15	Hi
	 */

	if (data[0] == 0xff && data[1] == 0xff && data[2] == 0xff) {
		switch (data[3]) {
		case 0x50:		/* start of frame */
#define HDRSZ 16
			data += HDRSZ;
			len -= HDRSZ;
#undef HDRSZ
			if (data[0] == 0xff || data[1] == 0xd8)
				gspca_frame_add(gspca_dev, FIRST_PACKET, frame,
						data, len);
			else
				gspca_dev->last_packet_type = DISCARD_PACKET;
			return;
		case 0x51:		/* end of frame */
			if (data[9] != 0)
				gspca_dev->last_packet_type = DISCARD_PACKET;
			gspca_frame_add(gspca_dev, LAST_PACKET, frame,
					data, 0);
			return;
		}
	}

	/* intermediate packet */
	gspca_frame_add(gspca_dev, INTER_PACKET, frame,
			data, len);
}

/* -- management routines -- */

static void setbrightness(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int val;

	val = sd->brightness;
	switch (sd->sensor) {
	case SEN_OV8610:
	case SEN_OV7610:
	case SEN_OV76BE:
	case SEN_OV6620:
	case SEN_OV6630:
	case SEN_OV7640:
		i2c_w(sd, OV7610_REG_BRT, val);
		break;
	case SEN_OV7620:
		/* 7620 doesn't like manual changes when in auto mode */
/*fixme
 *		if (!sd->auto_brt) */
			i2c_w(sd, OV7610_REG_BRT, val);
		break;
	case SEN_OV7670:
/*win trace
 *		i2c_w_mask(sd, OV7670_REG_COM8, 0, OV7670_COM8_AEC); */
		i2c_w(sd, OV7670_REG_BRIGHT, ov7670_abs_to_sm(val));
		break;
	}
}

static void setcontrast(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int val;

	val = sd->contrast;
	switch (sd->sensor) {
	case SEN_OV7610:
	case SEN_OV6620:
		i2c_w(sd, OV7610_REG_CNT, val);
		break;
	case SEN_OV6630:
		i2c_w_mask(sd, OV7610_REG_CNT, val >> 4, 0x0f);
	case SEN_OV8610: {
		static const __u8 ctab[] = {
			0x03, 0x09, 0x0b, 0x0f, 0x53, 0x6f, 0x35, 0x7f
		};

		/* Use Y gamma control instead. Bit 0 enables it. */
		i2c_w(sd, 0x64, ctab[val >> 5]);
		break;
	    }
	case SEN_OV7620: {
		static const __u8 ctab[] = {
			0x01, 0x05, 0x09, 0x11, 0x15, 0x35, 0x37, 0x57,
			0x5b, 0xa5, 0xa7, 0xc7, 0xc9, 0xcf, 0xef, 0xff
		};

		/* Use Y gamma control instead. Bit 0 enables it. */
		i2c_w(sd, 0x64, ctab[val >> 4]);
		break;
	    }
	case SEN_OV7640:
		/* Use gain control instead. */
		i2c_w(sd, OV7610_REG_GAIN, val >> 2);
		break;
	case SEN_OV7670:
		/* check that this isn't just the same as ov7610 */
		i2c_w(sd, OV7670_REG_CONTRAS, val >> 1);
		break;
	}
}

static void setcolors(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int val;

	val = sd->colors;
	switch (sd->sensor) {
	case SEN_OV8610:
	case SEN_OV7610:
	case SEN_OV76BE:
	case SEN_OV6620:
	case SEN_OV6630:
		i2c_w(sd, OV7610_REG_SAT, val);
		break;
	case SEN_OV7620:
		/* Use UV gamma control instead. Bits 0 & 7 are reserved. */
/*		rc = ov_i2c_write(sd->dev, 0x62, (val >> 9) & 0x7e);
		if (rc < 0)
			goto out; */
		i2c_w(sd, OV7610_REG_SAT, val);
		break;
	case SEN_OV7640:
		i2c_w(sd, OV7610_REG_SAT, val & 0xf0);
		break;
	case SEN_OV7670:
		/* supported later once I work out how to do it
		 * transparently fail now! */
		/* set REG_COM13 values for UV sat auto mode */
		break;
	}
}

static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	sd->brightness = val;
	if (gspca_dev->streaming)
		setbrightness(gspca_dev);
	return 0;
}

static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	*val = sd->brightness;
	return 0;
}

static int sd_setcontrast(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	sd->contrast = val;
	if (gspca_dev->streaming)
		setcontrast(gspca_dev);
	return 0;
}

static int sd_getcontrast(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	*val = sd->contrast;
	return 0;
}

static int sd_setcolors(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	sd->colors = val;
	if (gspca_dev->streaming)
		setcolors(gspca_dev);
	return 0;
}

static int sd_getcolors(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	*val = sd->colors;
	return 0;
}

static int sd_sethflip(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	sd->hflip = val;
	if (gspca_dev->streaming)
		sethvflip(sd);
	return 0;
}

static int sd_gethflip(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	*val = sd->hflip;
	return 0;
}

static int sd_setvflip(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	sd->vflip = val;
	if (gspca_dev->streaming)
		sethvflip(sd);
	return 0;
}

static int sd_getvflip(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	*val = sd->vflip;
	return 0;
}

/* sub-driver description */
static const struct sd_desc sd_desc = {
	.name = MODULE_NAME,
	.ctrls = sd_ctrls,
	.nctrls = ARRAY_SIZE(sd_ctrls),
	.config = sd_config,
	.init = sd_init,
	.start = sd_start,
	.stopN = sd_stopN,
	.pkt_scan = sd_pkt_scan,
};

/* -- module initialisation -- */
static const __devinitdata struct usb_device_id device_table[] = {
	{USB_DEVICE(0x041e, 0x4052)},
	{USB_DEVICE(0x041e, 0x405f)},
	{USB_DEVICE(0x041e, 0x4060)},
	{USB_DEVICE(0x041e, 0x4061)},
	{USB_DEVICE(0x041e, 0x4064)},
	{USB_DEVICE(0x041e, 0x4068)},
	{USB_DEVICE(0x045e, 0x028c)},
	{USB_DEVICE(0x054c, 0x0154)},
	{USB_DEVICE(0x054c, 0x0155)},
	{USB_DEVICE(0x05a9, 0x0519)},
	{USB_DEVICE(0x05a9, 0x0530)},
	{USB_DEVICE(0x05a9, 0x4519)},
	{USB_DEVICE(0x05a9, 0x8519)},
	{}
};

MODULE_DEVICE_TABLE(usb, device_table);

/* -- device connect -- */
static int sd_probe(struct usb_interface *intf,
			const struct usb_device_id *id)
{
	return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
				THIS_MODULE);
}

static struct usb_driver sd_driver = {
	.name = MODULE_NAME,
	.id_table = device_table,
	.probe = sd_probe,
	.disconnect = gspca_disconnect,
#ifdef CONFIG_PM
	.suspend = gspca_suspend,
	.resume = gspca_resume,
#endif
};

/* -- module insert / remove -- */
static int __init sd_mod_init(void)
{
	if (usb_register(&sd_driver) < 0)
		return -1;
	PDEBUG(D_PROBE, "registered");
	return 0;
}
static void __exit sd_mod_exit(void)
{
	usb_deregister(&sd_driver);
	PDEBUG(D_PROBE, "deregistered");
}

module_init(sd_mod_init);
module_exit(sd_mod_exit);

module_param(frame_rate, int, 0644);
MODULE_PARM_DESC(frame_rate, "Frame rate (5, 10, 15, 20 or 30 fps)");