// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * ov534-ov7xxx gspca driver
 *
 * Copyright (C) 2008 Antonio Ospite <ospite@studenti.unina.it>
 * Copyright (C) 2008 Jim Paris <jim@jtan.com>
 * Copyright (C) 2009 Jean-Francois Moine http://moinejf.free.fr
 *
 * Based on a prototype written by Mark Ferrell <majortrips@gmail.com>
 * USB protocol reverse engineered by Jim Paris <jim@jtan.com>
 * https://jim.sh/svn/jim/devl/playstation/ps3/eye/test/
 *
 * PS3 Eye camera enhanced by Richard Kaswy http://kaswy.free.fr
 * PS3 Eye camera - brightness, contrast, awb, agc, aec controls
 *                  added by Max Thrun <bear24rw@gmail.com>
 * PS3 Eye camera - FPS range extended by Joseph Howse
 *                  <josephhowse@nummist.com> https://nummist.com
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define MODULE_NAME "ov534"

#include "gspca.h"

#include <linux/fixp-arith.h>
#include <media/v4l2-ctrls.h>

#define OV534_REG_ADDRESS       0xf1    /* sensor address */
#define OV534_REG_SUBADDR       0xf2
#define OV534_REG_WRITE         0xf3
#define OV534_REG_READ          0xf4
#define OV534_REG_OPERATION     0xf5
#define OV534_REG_STATUS        0xf6

#define OV534_OP_WRITE_3        0x37
#define OV534_OP_WRITE_2        0x33
#define OV534_OP_READ_2         0xf9

#define CTRL_TIMEOUT 500
#define DEFAULT_FRAME_RATE 30

MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
MODULE_DESCRIPTION("GSPCA/OV534 USB Camera Driver");
MODULE_LICENSE("GPL");

/* specific webcam descriptor */
struct sd {
        struct gspca_dev gspca_dev;     /* !! must be the first item */

        struct v4l2_ctrl_handler ctrl_handler;
        struct v4l2_ctrl *hue;
        struct v4l2_ctrl *saturation;
        struct v4l2_ctrl *brightness;
        struct v4l2_ctrl *contrast;
        struct { /* gain control cluster */
                struct v4l2_ctrl *autogain;
                struct v4l2_ctrl *gain;
        };
        struct v4l2_ctrl *autowhitebalance;
        struct { /* exposure control cluster */
                struct v4l2_ctrl *autoexposure;
                struct v4l2_ctrl *exposure;
        };
        struct v4l2_ctrl *sharpness;
        struct v4l2_ctrl *hflip;
        struct v4l2_ctrl *vflip;
        struct v4l2_ctrl *plfreq;

        __u32 last_pts;
        u16 last_fid;
        u8 frame_rate;

        u8 sensor;
};
enum sensors {
        SENSOR_OV767x,
        SENSOR_OV772x,
        NSENSORS
};

static int sd_start(struct gspca_dev *gspca_dev);
static void sd_stopN(struct gspca_dev *gspca_dev);


static const struct v4l2_pix_format ov772x_mode[] = {
        {320, 240, V4L2_PIX_FMT_YUYV, V4L2_FIELD_NONE,
         .bytesperline = 320 * 2,
         .sizeimage = 320 * 240 * 2,
         .colorspace = V4L2_COLORSPACE_SRGB,
         .priv = 1},
        {640, 480, V4L2_PIX_FMT_YUYV, V4L2_FIELD_NONE,
         .bytesperline = 640 * 2,
         .sizeimage = 640 * 480 * 2,
         .colorspace = V4L2_COLORSPACE_SRGB,
         .priv = 0},
        {320, 240, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
         .bytesperline = 320,
         .sizeimage = 320 * 240,
         .colorspace = V4L2_COLORSPACE_SRGB,
         .priv = 1},
        {640, 480, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
         .bytesperline = 640,
         .sizeimage = 640 * 480,
         .colorspace = V4L2_COLORSPACE_SRGB,
         .priv = 0},
};
static const struct v4l2_pix_format ov767x_mode[] = {
        {320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
                .bytesperline = 320,
                .sizeimage = 320 * 240 * 3 / 8 + 590,
                .colorspace = V4L2_COLORSPACE_JPEG},
        {640, 480, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
                .bytesperline = 640,
                .sizeimage = 640 * 480 * 3 / 8 + 590,
                .colorspace = V4L2_COLORSPACE_JPEG},
};

static const u8 qvga_rates[] = {187, 150, 137, 125, 100, 75, 60, 50, 37, 30};
static const u8 vga_rates[] = {60, 50, 40, 30, 15};

static const struct framerates ov772x_framerates[] = {
        { /* 320x240 */
                .rates = qvga_rates,
                .nrates = ARRAY_SIZE(qvga_rates),
        },
        { /* 640x480 */
                .rates = vga_rates,
                .nrates = ARRAY_SIZE(vga_rates),
        },
        { /* 320x240 SGBRG8 */
                .rates = qvga_rates,
                .nrates = ARRAY_SIZE(qvga_rates),
        },
        { /* 640x480 SGBRG8 */
                .rates = vga_rates,
                .nrates = ARRAY_SIZE(vga_rates),
        },
};

struct reg_array {
        const u8 (*val)[2];
        int len;
};

static const u8 bridge_init_767x[][2] = {
/* comments from the ms-win file apollo7670.set */
/* str1 */
        {0xf1, 0x42},
        {0x88, 0xf8},
        {0x89, 0xff},
        {0x76, 0x03},
        {0x92, 0x03},
        {0x95, 0x10},
        {0xe2, 0x00},
        {0xe7, 0x3e},
        {0x8d, 0x1c},
        {0x8e, 0x00},
        {0x8f, 0x00},
        {0x1f, 0x00},
        {0xc3, 0xf9},
        {0x89, 0xff},
        {0x88, 0xf8},
        {0x76, 0x03},
        {0x92, 0x01},
        {0x93, 0x18},
        {0x1c, 0x00},
        {0x1d, 0x48},
        {0x1d, 0x00},
        {0x1d, 0xff},
        {0x1d, 0x02},
        {0x1d, 0x58},
        {0x1d, 0x00},
        {0x1c, 0x0a},
        {0x1d, 0x0a},
        {0x1d, 0x0e},
        {0xc0, 0x50},   /* HSize 640 */
        {0xc1, 0x3c},   /* VSize 480 */
        {0x34, 0x05},   /* enable Audio Suspend mode */
        {0xc2, 0x0c},   /* Input YUV */
        {0xc3, 0xf9},   /* enable PRE */
        {0x34, 0x05},   /* enable Audio Suspend mode */
        {0xe7, 0x2e},   /* this solves failure of "SuspendResumeTest" */
        {0x31, 0xf9},   /* enable 1.8V Suspend */
        {0x35, 0x02},   /* turn on JPEG */
        {0xd9, 0x10},
        {0x25, 0x42},   /* GPIO[8]:Input */
        {0x94, 0x11},   /* If the default setting is loaded when
                         * system boots up, this flag is closed here */
};
static const u8 sensor_init_767x[][2] = {
        {0x12, 0x80},
        {0x11, 0x03},
        {0x3a, 0x04},
        {0x12, 0x00},
        {0x17, 0x13},
        {0x18, 0x01},
        {0x32, 0xb6},
        {0x19, 0x02},
        {0x1a, 0x7a},
        {0x03, 0x0a},
        {0x0c, 0x00},
        {0x3e, 0x00},
        {0x70, 0x3a},
        {0x71, 0x35},
        {0x72, 0x11},
        {0x73, 0xf0},
        {0xa2, 0x02},
        {0x7a, 0x2a},   /* set Gamma=1.6 below */
        {0x7b, 0x12},
        {0x7c, 0x1d},
        {0x7d, 0x2d},
        {0x7e, 0x45},
        {0x7f, 0x50},
        {0x80, 0x59},
        {0x81, 0x62},
        {0x82, 0x6b},
        {0x83, 0x73},
        {0x84, 0x7b},
        {0x85, 0x8a},
        {0x86, 0x98},
        {0x87, 0xb2},
        {0x88, 0xca},
        {0x89, 0xe0},
        {0x13, 0xe0},
        {0x00, 0x00},
        {0x10, 0x00},
        {0x0d, 0x40},
        {0x14, 0x38},   /* gain max 16x */
        {0xa5, 0x05},
        {0xab, 0x07},
        {0x24, 0x95},
        {0x25, 0x33},
        {0x26, 0xe3},
        {0x9f, 0x78},
        {0xa0, 0x68},
        {0xa1, 0x03},
        {0xa6, 0xd8},
        {0xa7, 0xd8},
        {0xa8, 0xf0},
        {0xa9, 0x90},
        {0xaa, 0x94},
        {0x13, 0xe5},
        {0x0e, 0x61},
        {0x0f, 0x4b},
        {0x16, 0x02},
        {0x21, 0x02},
        {0x22, 0x91},
        {0x29, 0x07},
        {0x33, 0x0b},
        {0x35, 0x0b},
        {0x37, 0x1d},
        {0x38, 0x71},
        {0x39, 0x2a},
        {0x3c, 0x78},
        {0x4d, 0x40},
        {0x4e, 0x20},
        {0x69, 0x00},
        {0x6b, 0x4a},
        {0x74, 0x10},
        {0x8d, 0x4f},
        {0x8e, 0x00},
        {0x8f, 0x00},
        {0x90, 0x00},
        {0x91, 0x00},
        {0x96, 0x00},
        {0x9a, 0x80},
        {0xb0, 0x84},
        {0xb1, 0x0c},
        {0xb2, 0x0e},
        {0xb3, 0x82},
        {0xb8, 0x0a},
        {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},
        {0x6a, 0x40},
        {0x01, 0x40},
        {0x02, 0x40},
        {0x13, 0xe7},
        {0x4f, 0x80},
        {0x50, 0x80},
        {0x51, 0x00},
        {0x52, 0x22},
        {0x53, 0x5e},
        {0x54, 0x80},
        {0x58, 0x9e},
        {0x41, 0x08},
        {0x3f, 0x00},
        {0x75, 0x04},
        {0x76, 0xe1},
        {0x4c, 0x00},
        {0x77, 0x01},
        {0x3d, 0xc2},
        {0x4b, 0x09},
        {0xc9, 0x60},
        {0x41, 0x38},   /* jfm: auto sharpness + auto de-noise  */
        {0x56, 0x40},
        {0x34, 0x11},
        {0x3b, 0xc2},
        {0xa4, 0x8a},   /* Night mode trigger point */
        {0x96, 0x00},
        {0x97, 0x30},
        {0x98, 0x20},
        {0x99, 0x20},
        {0x9a, 0x84},
        {0x9b, 0x29},
        {0x9c, 0x03},
        {0x9d, 0x4c},
        {0x9e, 0x3f},
        {0x78, 0x04},
        {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, 0x20},
        {0x79, 0x26},
};
static const u8 bridge_start_vga_767x[][2] = {
/* str59 JPG */
        {0x94, 0xaa},
        {0xf1, 0x42},
        {0xe5, 0x04},
        {0xc0, 0x50},
        {0xc1, 0x3c},
        {0xc2, 0x0c},
        {0x35, 0x02},   /* turn on JPEG */
        {0xd9, 0x10},
        {0xda, 0x00},   /* for higher clock rate(30fps) */
        {0x34, 0x05},   /* enable Audio Suspend mode */
        {0xc3, 0xf9},   /* enable PRE */
        {0x8c, 0x00},   /* CIF VSize LSB[2:0] */
        {0x8d, 0x1c},   /* output YUV */
/*      {0x34, 0x05},    * enable Audio Suspend mode (?) */
        {0x50, 0x00},   /* H/V divider=0 */
        {0x51, 0xa0},   /* input H=640/4 */
        {0x52, 0x3c},   /* input V=480/4 */
        {0x53, 0x00},   /* offset X=0 */
        {0x54, 0x00},   /* offset Y=0 */
        {0x55, 0x00},   /* H/V size[8]=0 */
        {0x57, 0x00},   /* H-size[9]=0 */
        {0x5c, 0x00},   /* output size[9:8]=0 */
        {0x5a, 0xa0},   /* output H=640/4 */
        {0x5b, 0x78},   /* output V=480/4 */
        {0x1c, 0x0a},
        {0x1d, 0x0a},
        {0x94, 0x11},
};
static const u8 sensor_start_vga_767x[][2] = {
        {0x11, 0x01},
        {0x1e, 0x04},
        {0x19, 0x02},
        {0x1a, 0x7a},
};
static const u8 bridge_start_qvga_767x[][2] = {
/* str86 JPG */
        {0x94, 0xaa},
        {0xf1, 0x42},
        {0xe5, 0x04},
        {0xc0, 0x80},
        {0xc1, 0x60},
        {0xc2, 0x0c},
        {0x35, 0x02},   /* turn on JPEG */
        {0xd9, 0x10},
        {0xc0, 0x50},   /* CIF HSize 640 */
        {0xc1, 0x3c},   /* CIF VSize 480 */
        {0x8c, 0x00},   /* CIF VSize LSB[2:0] */
        {0x8d, 0x1c},   /* output YUV */
        {0x34, 0x05},   /* enable Audio Suspend mode */
        {0xc2, 0x4c},   /* output YUV and Enable DCW */
        {0xc3, 0xf9},   /* enable PRE */
        {0x1c, 0x00},   /* indirect addressing */
        {0x1d, 0x48},   /* output YUV422 */
        {0x50, 0x89},   /* H/V divider=/2; plus DCW AVG */
        {0x51, 0xa0},   /* DCW input H=640/4 */
        {0x52, 0x78},   /* DCW input V=480/4 */
        {0x53, 0x00},   /* offset X=0 */
        {0x54, 0x00},   /* offset Y=0 */
        {0x55, 0x00},   /* H/V size[8]=0 */
        {0x57, 0x00},   /* H-size[9]=0 */
        {0x5c, 0x00},   /* DCW output size[9:8]=0 */
        {0x5a, 0x50},   /* DCW output H=320/4 */
        {0x5b, 0x3c},   /* DCW output V=240/4 */
        {0x1c, 0x0a},
        {0x1d, 0x0a},
        {0x94, 0x11},
};
static const u8 sensor_start_qvga_767x[][2] = {
        {0x11, 0x01},
        {0x1e, 0x04},
        {0x19, 0x02},
        {0x1a, 0x7a},
};

static const u8 bridge_init_772x[][2] = {
        { 0x88, 0xf8 },
        { 0x89, 0xff },
        { 0x76, 0x03 },
        { 0x92, 0x01 },
        { 0x93, 0x18 },
        { 0x94, 0x10 },
        { 0x95, 0x10 },
        { 0xe2, 0x00 },
        { 0xe7, 0x3e },

        { 0x96, 0x00 },

        { 0x97, 0x20 },
        { 0x97, 0x20 },
        { 0x97, 0x20 },
        { 0x97, 0x0a },
        { 0x97, 0x3f },
        { 0x97, 0x4a },
        { 0x97, 0x20 },
        { 0x97, 0x15 },
        { 0x97, 0x0b },

        { 0x8e, 0x40 },
        { 0x1f, 0x81 },
        { 0x34, 0x05 },
        { 0xe3, 0x04 },
        { 0x89, 0x00 },
        { 0x76, 0x00 },
        { 0xe7, 0x2e },
        { 0x31, 0xf9 },
        { 0x25, 0x42 },
        { 0x21, 0xf0 },

        { 0x1c, 0x0a },
        { 0x1d, 0x08 }, /* turn on UVC header */
        { 0x1d, 0x0e }, /* .. */
};
static const u8 sensor_init_772x[][2] = {
        { 0x12, 0x80 },
        { 0x11, 0x01 },
/*fixme: better have a delay?*/
        { 0x11, 0x01 },
        { 0x11, 0x01 },
        { 0x11, 0x01 },
        { 0x11, 0x01 },
        { 0x11, 0x01 },
        { 0x11, 0x01 },
        { 0x11, 0x01 },
        { 0x11, 0x01 },
        { 0x11, 0x01 },
        { 0x11, 0x01 },

        { 0x3d, 0x03 },
        { 0x17, 0x26 },
        { 0x18, 0xa0 },
        { 0x19, 0x07 },
        { 0x1a, 0xf0 },
        { 0x32, 0x00 },
        { 0x29, 0xa0 },
        { 0x2c, 0xf0 },
        { 0x65, 0x20 },
        { 0x11, 0x01 },
        { 0x42, 0x7f },
        { 0x63, 0xaa },         /* AWB - was e0 */
        { 0x64, 0xff },
        { 0x66, 0x00 },
        { 0x13, 0xf0 },         /* com8 */
        { 0x0d, 0x41 },
        { 0x0f, 0xc5 },
        { 0x14, 0x11 },

        { 0x22, 0x7f },
        { 0x23, 0x03 },
        { 0x24, 0x40 },
        { 0x25, 0x30 },
        { 0x26, 0xa1 },
        { 0x2a, 0x00 },
        { 0x2b, 0x00 },
        { 0x6b, 0xaa },
        { 0x13, 0xff },         /* AWB */

        { 0x90, 0x05 },
        { 0x91, 0x01 },
        { 0x92, 0x03 },
        { 0x93, 0x00 },
        { 0x94, 0x60 },
        { 0x95, 0x3c },
        { 0x96, 0x24 },
        { 0x97, 0x1e },
        { 0x98, 0x62 },
        { 0x99, 0x80 },
        { 0x9a, 0x1e },
        { 0x9b, 0x08 },
        { 0x9c, 0x20 },
        { 0x9e, 0x81 },

        { 0xa6, 0x07 },
        { 0x7e, 0x0c },
        { 0x7f, 0x16 },
        { 0x80, 0x2a },
        { 0x81, 0x4e },
        { 0x82, 0x61 },
        { 0x83, 0x6f },
        { 0x84, 0x7b },
        { 0x85, 0x86 },
        { 0x86, 0x8e },
        { 0x87, 0x97 },
        { 0x88, 0xa4 },
        { 0x89, 0xaf },
        { 0x8a, 0xc5 },
        { 0x8b, 0xd7 },
        { 0x8c, 0xe8 },
        { 0x8d, 0x20 },

        { 0x2b, 0x00 },
        { 0x22, 0x7f },
        { 0x23, 0x03 },
        { 0x11, 0x01 },
        { 0x64, 0xff },
        { 0x0d, 0x41 },

        { 0x14, 0x41 },
        { 0x0e, 0xcd },
        { 0xac, 0xbf },
        { 0x8e, 0x00 },         /* De-noise threshold */
};
static const u8 bridge_start_vga_yuyv_772x[][2] = {
        {0x88, 0x00},
        {0x1c, 0x00},
        {0x1d, 0x40},
        {0x1d, 0x02},
        {0x1d, 0x00},
        {0x1d, 0x02},
        {0x1d, 0x58},
        {0x1d, 0x00},
        {0x8d, 0x1c},
        {0x8e, 0x80},
        {0xc0, 0x50},
        {0xc1, 0x3c},
        {0xc2, 0x0c},
        {0xc3, 0x69},
};
static const u8 sensor_start_vga_yuyv_772x[][2] = {
        {0x12, 0x00},
        {0x17, 0x26},
        {0x18, 0xa0},
        {0x19, 0x07},
        {0x1a, 0xf0},
        {0x29, 0xa0},
        {0x2c, 0xf0},
        {0x65, 0x20},
        {0x67, 0x00},
};
static const u8 bridge_start_qvga_yuyv_772x[][2] = {
        {0x88, 0x00},
        {0x1c, 0x00},
        {0x1d, 0x40},
        {0x1d, 0x02},
        {0x1d, 0x00},
        {0x1d, 0x01},
        {0x1d, 0x4b},
        {0x1d, 0x00},
        {0x8d, 0x1c},
        {0x8e, 0x80},
        {0xc0, 0x28},
        {0xc1, 0x1e},
        {0xc2, 0x0c},
        {0xc3, 0x69},
};
static const u8 sensor_start_qvga_yuyv_772x[][2] = {
        {0x12, 0x40},
        {0x17, 0x3f},
        {0x18, 0x50},
        {0x19, 0x03},
        {0x1a, 0x78},
        {0x29, 0x50},
        {0x2c, 0x78},
        {0x65, 0x2f},
        {0x67, 0x00},
};
static const u8 bridge_start_vga_gbrg_772x[][2] = {
        {0x88, 0x08},
        {0x1c, 0x00},
        {0x1d, 0x00},
        {0x1d, 0x02},
        {0x1d, 0x00},
        {0x1d, 0x01},
        {0x1d, 0x2c},
        {0x1d, 0x00},
        {0x8d, 0x00},
        {0x8e, 0x00},
        {0xc0, 0x50},
        {0xc1, 0x3c},
        {0xc2, 0x01},
        {0xc3, 0x01},
};
static const u8 sensor_start_vga_gbrg_772x[][2] = {
        {0x12, 0x01},
        {0x17, 0x26},
        {0x18, 0xa0},
        {0x19, 0x07},
        {0x1a, 0xf0},
        {0x29, 0xa0},
        {0x2c, 0xf0},
        {0x65, 0x20},
        {0x67, 0x02},
};
static const u8 bridge_start_qvga_gbrg_772x[][2] = {
        {0x88, 0x08},
        {0x1c, 0x00},
        {0x1d, 0x00},
        {0x1d, 0x02},
        {0x1d, 0x00},
        {0x1d, 0x00},
        {0x1d, 0x4b},
        {0x1d, 0x00},
        {0x8d, 0x00},
        {0x8e, 0x00},
        {0xc0, 0x28},
        {0xc1, 0x1e},
        {0xc2, 0x01},
        {0xc3, 0x01},
};
static const u8 sensor_start_qvga_gbrg_772x[][2] = {
        {0x12, 0x41},
        {0x17, 0x3f},
        {0x18, 0x50},
        {0x19, 0x03},
        {0x1a, 0x78},
        {0x29, 0x50},
        {0x2c, 0x78},
        {0x65, 0x2f},
        {0x67, 0x02},
};

static void ov534_reg_write(struct gspca_dev *gspca_dev, u16 reg, u8 val)
{
        struct usb_device *udev = gspca_dev->dev;
        int ret;

        if (gspca_dev->usb_err < 0)
                return;

        gspca_dbg(gspca_dev, D_USBO, "SET 01 0000 %04x %02x\n", reg, val);
        gspca_dev->usb_buf[0] = val;
        ret = usb_control_msg(udev,
                              usb_sndctrlpipe(udev, 0),
                              0x01,
                              USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              0x00, reg, gspca_dev->usb_buf, 1, CTRL_TIMEOUT);
        if (ret < 0) {
                pr_err("write failed %d\n", ret);
                gspca_dev->usb_err = ret;
        }
}

static u8 ov534_reg_read(struct gspca_dev *gspca_dev, u16 reg)
{
        struct usb_device *udev = gspca_dev->dev;
        int ret;

        if (gspca_dev->usb_err < 0)
                return 0;
        ret = usb_control_msg(udev,
                              usb_rcvctrlpipe(udev, 0),
                              0x01,
                              USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              0x00, reg, gspca_dev->usb_buf, 1, CTRL_TIMEOUT);
        gspca_dbg(gspca_dev, D_USBI, "GET 01 0000 %04x %02x\n",
                  reg, gspca_dev->usb_buf[0]);
        if (ret < 0) {
                pr_err("read failed %d\n", ret);
                gspca_dev->usb_err = ret;
                /*
                 * Make sure the result is zeroed to avoid uninitialized
                 * values.
                 */
                gspca_dev->usb_buf[0] = 0;
        }
        return gspca_dev->usb_buf[0];
}

/* Two bits control LED: 0x21 bit 7 and 0x23 bit 7.
 * (direction and output)? */
static void ov534_set_led(struct gspca_dev *gspca_dev, int status)
{
        u8 data;

        gspca_dbg(gspca_dev, D_CONF, "led status: %d\n", status);

        data = ov534_reg_read(gspca_dev, 0x21);
        data |= 0x80;
        ov534_reg_write(gspca_dev, 0x21, data);

        data = ov534_reg_read(gspca_dev, 0x23);
        if (status)
                data |= 0x80;
        else
                data &= ~0x80;

        ov534_reg_write(gspca_dev, 0x23, data);

        if (!status) {
                data = ov534_reg_read(gspca_dev, 0x21);
                data &= ~0x80;
                ov534_reg_write(gspca_dev, 0x21, data);
        }
}

static int sccb_check_status(struct gspca_dev *gspca_dev)
{
        u8 data;
        int i;

        for (i = 0; i < 5; i++) {
                usleep_range(10000, 20000);
                data = ov534_reg_read(gspca_dev, OV534_REG_STATUS);

                switch (data) {
                case 0x00:
                        return 1;
                case 0x04:
                        return 0;
                case 0x03:
                        break;
                default:
                        gspca_err(gspca_dev, "sccb status 0x%02x, attempt %d/5\n",
                                  data, i + 1);
                }
        }
        return 0;
}

static void sccb_reg_write(struct gspca_dev *gspca_dev, u8 reg, u8 val)
{
        gspca_dbg(gspca_dev, D_USBO, "sccb write: %02x %02x\n", reg, val);
        ov534_reg_write(gspca_dev, OV534_REG_SUBADDR, reg);
        ov534_reg_write(gspca_dev, OV534_REG_WRITE, val);
        ov534_reg_write(gspca_dev, OV534_REG_OPERATION, OV534_OP_WRITE_3);

        if (!sccb_check_status(gspca_dev)) {
                pr_err("sccb_reg_write failed\n");
                gspca_dev->usb_err = -EIO;
        }
}

static u8 sccb_reg_read(struct gspca_dev *gspca_dev, u16 reg)
{
        ov534_reg_write(gspca_dev, OV534_REG_SUBADDR, reg);
        ov534_reg_write(gspca_dev, OV534_REG_OPERATION, OV534_OP_WRITE_2);
        if (!sccb_check_status(gspca_dev))
                pr_err("sccb_reg_read failed 1\n");

        ov534_reg_write(gspca_dev, OV534_REG_OPERATION, OV534_OP_READ_2);
        if (!sccb_check_status(gspca_dev))
                pr_err("sccb_reg_read failed 2\n");

        return ov534_reg_read(gspca_dev, OV534_REG_READ);
}

/* output a bridge sequence (reg - val) */
static void reg_w_array(struct gspca_dev *gspca_dev,
                        const u8 (*data)[2], int len)
{
        while (--len >= 0) {
                ov534_reg_write(gspca_dev, (*data)[0], (*data)[1]);
                data++;
        }
}

/* output a sensor sequence (reg - val) */
static void sccb_w_array(struct gspca_dev *gspca_dev,
                        const u8 (*data)[2], int len)
{
        while (--len >= 0) {
                if ((*data)[0] != 0xff) {
                        sccb_reg_write(gspca_dev, (*data)[0], (*data)[1]);
                } else {
                        sccb_reg_read(gspca_dev, (*data)[1]);
                        sccb_reg_write(gspca_dev, 0xff, 0x00);
                }
                data++;
        }
}

/* ov772x specific controls */
static void set_frame_rate(struct gspca_dev *gspca_dev)
{
        struct sd *sd = (struct sd *) gspca_dev;
        int i;
        struct rate_s {
                u8 fps;
                u8 r11;
                u8 r0d;
                u8 re5;
        };
        const struct rate_s *r;
        static const struct rate_s rate_0[] = { /* 640x480 */
                {60, 0x01, 0xc1, 0x04},
                {50, 0x01, 0x41, 0x02},
                {40, 0x02, 0xc1, 0x04},
                {30, 0x04, 0x81, 0x02},
                {15, 0x03, 0x41, 0x04},
        };
        static const struct rate_s rate_1[] = { /* 320x240 */
/*              {205, 0x01, 0xc1, 0x02},  * 205 FPS: video is partly corrupt */
                {187, 0x01, 0x81, 0x02}, /* 187 FPS or below: video is valid */
                {150, 0x01, 0xc1, 0x04},
                {137, 0x02, 0xc1, 0x02},
                {125, 0x02, 0x81, 0x02},
                {100, 0x02, 0xc1, 0x04},
                {75, 0x03, 0xc1, 0x04},
                {60, 0x04, 0xc1, 0x04},
                {50, 0x02, 0x41, 0x04},
                {37, 0x03, 0x41, 0x04},
                {30, 0x04, 0x41, 0x04},
        };

        if (sd->sensor != SENSOR_OV772x)
                return;
        if (gspca_dev->cam.cam_mode[gspca_dev->curr_mode].priv == 0) {
                r = rate_0;
                i = ARRAY_SIZE(rate_0);
        } else {
                r = rate_1;
                i = ARRAY_SIZE(rate_1);
        }
        while (--i >= 0) {
                if (sd->frame_rate >= r->fps)
                        break;
                r++;
        }

        sccb_reg_write(gspca_dev, 0x11, r->r11);
        sccb_reg_write(gspca_dev, 0x0d, r->r0d);
        ov534_reg_write(gspca_dev, 0xe5, r->re5);

        gspca_dbg(gspca_dev, D_PROBE, "frame_rate: %d\n", r->fps);
}

static void sethue(struct gspca_dev *gspca_dev, s32 val)
{
        struct sd *sd = (struct sd *) gspca_dev;

        if (sd->sensor == SENSOR_OV767x) {
                /* TBD */
        } else {
                s16 huesin;
                s16 huecos;

                /* According to the datasheet the registers expect HUESIN and
                 * HUECOS to be the result of the trigonometric functions,
                 * scaled by 0x80.
                 *
                 * The 0x7fff here represents the maximum absolute value
                 * returned byt fixp_sin and fixp_cos, so the scaling will
                 * consider the result like in the interval [-1.0, 1.0].
                 */
                huesin = fixp_sin16(val) * 0x80 / 0x7fff;
                huecos = fixp_cos16(val) * 0x80 / 0x7fff;

                if (huesin < 0) {
                        sccb_reg_write(gspca_dev, 0xab,
                                sccb_reg_read(gspca_dev, 0xab) | 0x2);
                        huesin = -huesin;
                } else {
                        sccb_reg_write(gspca_dev, 0xab,
                                sccb_reg_read(gspca_dev, 0xab) & ~0x2);

                }
                sccb_reg_write(gspca_dev, 0xa9, (u8)huecos);
                sccb_reg_write(gspca_dev, 0xaa, (u8)huesin);
        }
}

static void setsaturation(struct gspca_dev *gspca_dev, s32 val)
{
        struct sd *sd = (struct sd *) gspca_dev;

        if (sd->sensor == SENSOR_OV767x) {
                int i;
                static u8 color_tb[][6] = {
                        {0x42, 0x42, 0x00, 0x11, 0x30, 0x41},
                        {0x52, 0x52, 0x00, 0x16, 0x3c, 0x52},
                        {0x66, 0x66, 0x00, 0x1b, 0x4b, 0x66},
                        {0x80, 0x80, 0x00, 0x22, 0x5e, 0x80},
                        {0x9a, 0x9a, 0x00, 0x29, 0x71, 0x9a},
                        {0xb8, 0xb8, 0x00, 0x31, 0x87, 0xb8},
                        {0xdd, 0xdd, 0x00, 0x3b, 0xa2, 0xdd},
                };

                for (i = 0; i < ARRAY_SIZE(color_tb[0]); i++)
                        sccb_reg_write(gspca_dev, 0x4f + i, color_tb[val][i]);
        } else {
                sccb_reg_write(gspca_dev, 0xa7, val); /* U saturation */
                sccb_reg_write(gspca_dev, 0xa8, val); /* V saturation */
        }
}

static void setbrightness(struct gspca_dev *gspca_dev, s32 val)
{
        struct sd *sd = (struct sd *) gspca_dev;

        if (sd->sensor == SENSOR_OV767x) {
                if (val < 0)
                        val = 0x80 - val;
                sccb_reg_write(gspca_dev, 0x55, val);   /* bright */
        } else {
                sccb_reg_write(gspca_dev, 0x9b, val);
        }
}

static void setcontrast(struct gspca_dev *gspca_dev, s32 val)
{
        struct sd *sd = (struct sd *) gspca_dev;

        if (sd->sensor == SENSOR_OV767x)
                sccb_reg_write(gspca_dev, 0x56, val);   /* contras */
        else
                sccb_reg_write(gspca_dev, 0x9c, val);
}

static void setgain(struct gspca_dev *gspca_dev, s32 val)
{
        switch (val & 0x30) {
        case 0x00:
                val &= 0x0f;
                break;
        case 0x10:
                val &= 0x0f;
                val |= 0x30;
                break;
        case 0x20:
                val &= 0x0f;
                val |= 0x70;
                break;
        default:
/*      case 0x30: */
                val &= 0x0f;
                val |= 0xf0;
                break;
        }
        sccb_reg_write(gspca_dev, 0x00, val);
}

static s32 getgain(struct gspca_dev *gspca_dev)
{
        return sccb_reg_read(gspca_dev, 0x00);
}

static void setexposure(struct gspca_dev *gspca_dev, s32 val)
{
        struct sd *sd = (struct sd *) gspca_dev;

        if (sd->sensor == SENSOR_OV767x) {

                /* set only aec[9:2] */
                sccb_reg_write(gspca_dev, 0x10, val);   /* aech */
        } else {

                /* 'val' is one byte and represents half of the exposure value
                 * we are going to set into registers, a two bytes value:
                 *
                 *    MSB: ((u16) val << 1) >> 8   == val >> 7
                 *    LSB: ((u16) val << 1) & 0xff == val << 1
                 */
                sccb_reg_write(gspca_dev, 0x08, val >> 7);
                sccb_reg_write(gspca_dev, 0x10, val << 1);
        }
}

static s32 getexposure(struct gspca_dev *gspca_dev)
{
        struct sd *sd = (struct sd *) gspca_dev;

        if (sd->sensor == SENSOR_OV767x) {
                /* get only aec[9:2] */
                return sccb_reg_read(gspca_dev, 0x10);  /* aech */
        } else {
                u8 hi = sccb_reg_read(gspca_dev, 0x08);
                u8 lo = sccb_reg_read(gspca_dev, 0x10);
                return (hi << 8 | lo) >> 1;
        }
}

static void setagc(struct gspca_dev *gspca_dev, s32 val)
{
        if (val) {
                sccb_reg_write(gspca_dev, 0x13,
                                sccb_reg_read(gspca_dev, 0x13) | 0x04);
                sccb_reg_write(gspca_dev, 0x64,
                                sccb_reg_read(gspca_dev, 0x64) | 0x03);
        } else {
                sccb_reg_write(gspca_dev, 0x13,
                                sccb_reg_read(gspca_dev, 0x13) & ~0x04);
                sccb_reg_write(gspca_dev, 0x64,
                                sccb_reg_read(gspca_dev, 0x64) & ~0x03);
        }
}

static void setawb(struct gspca_dev *gspca_dev, s32 val)
{
        struct sd *sd = (struct sd *) gspca_dev;

        if (val) {
                sccb_reg_write(gspca_dev, 0x13,
                                sccb_reg_read(gspca_dev, 0x13) | 0x02);
                if (sd->sensor == SENSOR_OV772x)
                        sccb_reg_write(gspca_dev, 0x63,
                                sccb_reg_read(gspca_dev, 0x63) | 0xc0);
        } else {
                sccb_reg_write(gspca_dev, 0x13,
                                sccb_reg_read(gspca_dev, 0x13) & ~0x02);
                if (sd->sensor == SENSOR_OV772x)
                        sccb_reg_write(gspca_dev, 0x63,
                                sccb_reg_read(gspca_dev, 0x63) & ~0xc0);
        }
}

static void setaec(struct gspca_dev *gspca_dev, s32 val)
{
        struct sd *sd = (struct sd *) gspca_dev;
        u8 data;

        data = sd->sensor == SENSOR_OV767x ?
                        0x05 :          /* agc + aec */
                        0x01;           /* agc */
        switch (val) {
        case V4L2_EXPOSURE_AUTO:
                sccb_reg_write(gspca_dev, 0x13,
                                sccb_reg_read(gspca_dev, 0x13) | data);
                break;
        case V4L2_EXPOSURE_MANUAL:
                sccb_reg_write(gspca_dev, 0x13,
                                sccb_reg_read(gspca_dev, 0x13) & ~data);
                break;
        }
}

static void setsharpness(struct gspca_dev *gspca_dev, s32 val)
{
        sccb_reg_write(gspca_dev, 0x91, val);   /* Auto de-noise threshold */
        sccb_reg_write(gspca_dev, 0x8e, val);   /* De-noise threshold */
}

static void sethvflip(struct gspca_dev *gspca_dev, s32 hflip, s32 vflip)
{
        struct sd *sd = (struct sd *) gspca_dev;
        u8 val;

        if (sd->sensor == SENSOR_OV767x) {
                val = sccb_reg_read(gspca_dev, 0x1e);   /* mvfp */
                val &= ~0x30;
                if (hflip)
                        val |= 0x20;
                if (vflip)
                        val |= 0x10;
                sccb_reg_write(gspca_dev, 0x1e, val);
        } else {
                val = sccb_reg_read(gspca_dev, 0x0c);
                val &= ~0xc0;
                if (hflip == 0)
                        val |= 0x40;
                if (vflip == 0)
                        val |= 0x80;
                sccb_reg_write(gspca_dev, 0x0c, val);
        }
}

static void setlightfreq(struct gspca_dev *gspca_dev, s32 val)
{
        struct sd *sd = (struct sd *) gspca_dev;

        val = val ? 0x9e : 0x00;
        if (sd->sensor == SENSOR_OV767x) {
                sccb_reg_write(gspca_dev, 0x2a, 0x00);
                if (val)
                        val = 0x9d;     /* insert dummy to 25fps for 50Hz */
        }
        sccb_reg_write(gspca_dev, 0x2b, val);
}


/* 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;

        cam = &gspca_dev->cam;

        cam->cam_mode = ov772x_mode;
        cam->nmodes = ARRAY_SIZE(ov772x_mode);

        sd->frame_rate = DEFAULT_FRAME_RATE;

        return 0;
}

static int ov534_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
{
        struct sd *sd = container_of(ctrl->handler, struct sd, ctrl_handler);
        struct gspca_dev *gspca_dev = &sd->gspca_dev;

        switch (ctrl->id) {
        case V4L2_CID_AUTOGAIN:
                gspca_dev->usb_err = 0;
                if (ctrl->val && sd->gain && gspca_dev->streaming)
                        sd->gain->val = getgain(gspca_dev);
                return gspca_dev->usb_err;

        case V4L2_CID_EXPOSURE_AUTO:
                gspca_dev->usb_err = 0;
                if (ctrl->val == V4L2_EXPOSURE_AUTO && sd->exposure &&
                    gspca_dev->streaming)
                        sd->exposure->val = getexposure(gspca_dev);
                return gspca_dev->usb_err;
        }
        return -EINVAL;
}

static int ov534_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct sd *sd = container_of(ctrl->handler, struct sd, ctrl_handler);
        struct gspca_dev *gspca_dev = &sd->gspca_dev;

        gspca_dev->usb_err = 0;
        if (!gspca_dev->streaming)
                return 0;

        switch (ctrl->id) {
        case V4L2_CID_HUE:
                sethue(gspca_dev, ctrl->val);
                break;
        case V4L2_CID_SATURATION:
                setsaturation(gspca_dev, ctrl->val);
                break;
        case V4L2_CID_BRIGHTNESS:
                setbrightness(gspca_dev, ctrl->val);
                break;
        case V4L2_CID_CONTRAST:
                setcontrast(gspca_dev, ctrl->val);
                break;
        case V4L2_CID_AUTOGAIN:
        /* case V4L2_CID_GAIN: */
                setagc(gspca_dev, ctrl->val);
                if (!gspca_dev->usb_err && !ctrl->val && sd->gain)
                        setgain(gspca_dev, sd->gain->val);
                break;
        case V4L2_CID_AUTO_WHITE_BALANCE:
                setawb(gspca_dev, ctrl->val);
                break;
        case V4L2_CID_EXPOSURE_AUTO:
        /* case V4L2_CID_EXPOSURE: */
                setaec(gspca_dev, ctrl->val);
                if (!gspca_dev->usb_err && ctrl->val == V4L2_EXPOSURE_MANUAL &&
                    sd->exposure)
                        setexposure(gspca_dev, sd->exposure->val);
                break;
        case V4L2_CID_SHARPNESS:
                setsharpness(gspca_dev, ctrl->val);
                break;
        case V4L2_CID_HFLIP:
                sethvflip(gspca_dev, ctrl->val, sd->vflip->val);
                break;
        case V4L2_CID_VFLIP:
                sethvflip(gspca_dev, sd->hflip->val, ctrl->val);
                break;
        case V4L2_CID_POWER_LINE_FREQUENCY:
                setlightfreq(gspca_dev, ctrl->val);
                break;
        }
        return gspca_dev->usb_err;
}

static const struct v4l2_ctrl_ops ov534_ctrl_ops = {
        .g_volatile_ctrl = ov534_g_volatile_ctrl,
        .s_ctrl = ov534_s_ctrl,
};

static int sd_init_controls(struct gspca_dev *gspca_dev)
{
        struct sd *sd = (struct sd *) gspca_dev;
        struct v4l2_ctrl_handler *hdl = &sd->ctrl_handler;
        /* parameters with different values between the supported sensors */
        int saturation_min;
        int saturation_max;
        int saturation_def;
        int brightness_min;
        int brightness_max;
        int brightness_def;
        int contrast_max;
        int contrast_def;
        int exposure_min;
        int exposure_max;
        int exposure_def;
        int hflip_def;

        if (sd->sensor == SENSOR_OV767x) {
                saturation_min = 0;
                saturation_max = 6;
                saturation_def = 3;
                brightness_min = -127;
                brightness_max = 127;
                brightness_def = 0;
                contrast_max = 0x80;
                contrast_def = 0x40;
                exposure_min = 0x08;
                exposure_max = 0x60;
                exposure_def = 0x13;
                hflip_def = 1;
        } else {
                saturation_min = 0;
                saturation_max = 255;
                saturation_def = 64;
                brightness_min = 0;
                brightness_max = 255;
                brightness_def = 0;
                contrast_max = 255;
                contrast_def = 32;
                exposure_min = 0;
                exposure_max = 255;
                exposure_def = 120;
                hflip_def = 0;
        }

        gspca_dev->vdev.ctrl_handler = hdl;

        v4l2_ctrl_handler_init(hdl, 13);

        if (sd->sensor == SENSOR_OV772x)
                sd->hue = v4l2_ctrl_new_std(hdl, &ov534_ctrl_ops,
                                V4L2_CID_HUE, -90, 90, 1, 0);

        sd->saturation = v4l2_ctrl_new_std(hdl, &ov534_ctrl_ops,
                        V4L2_CID_SATURATION, saturation_min, saturation_max, 1,
                        saturation_def);
        sd->brightness = v4l2_ctrl_new_std(hdl, &ov534_ctrl_ops,
                        V4L2_CID_BRIGHTNESS, brightness_min, brightness_max, 1,
                        brightness_def);
        sd->contrast = v4l2_ctrl_new_std(hdl, &ov534_ctrl_ops,
                        V4L2_CID_CONTRAST, 0, contrast_max, 1, contrast_def);

        if (sd->sensor == SENSOR_OV772x) {
                sd->autogain = v4l2_ctrl_new_std(hdl, &ov534_ctrl_ops,
                                V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
                sd->gain = v4l2_ctrl_new_std(hdl, &ov534_ctrl_ops,
                                V4L2_CID_GAIN, 0, 63, 1, 20);
        }

        sd->autoexposure = v4l2_ctrl_new_std_menu(hdl, &ov534_ctrl_ops,
                        V4L2_CID_EXPOSURE_AUTO,
                        V4L2_EXPOSURE_MANUAL, 0,
                        V4L2_EXPOSURE_AUTO);
        sd->exposure = v4l2_ctrl_new_std(hdl, &ov534_ctrl_ops,
                        V4L2_CID_EXPOSURE, exposure_min, exposure_max, 1,
                        exposure_def);

        sd->autowhitebalance = v4l2_ctrl_new_std(hdl, &ov534_ctrl_ops,
                        V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 1);

        if (sd->sensor == SENSOR_OV772x)
                sd->sharpness = v4l2_ctrl_new_std(hdl, &ov534_ctrl_ops,
                                V4L2_CID_SHARPNESS, 0, 63, 1, 0);

        sd->hflip = v4l2_ctrl_new_std(hdl, &ov534_ctrl_ops,
                        V4L2_CID_HFLIP, 0, 1, 1, hflip_def);
        sd->vflip = v4l2_ctrl_new_std(hdl, &ov534_ctrl_ops,
                        V4L2_CID_VFLIP, 0, 1, 1, 0);
        sd->plfreq = v4l2_ctrl_new_std_menu(hdl, &ov534_ctrl_ops,
                        V4L2_CID_POWER_LINE_FREQUENCY,
                        V4L2_CID_POWER_LINE_FREQUENCY_50HZ, 0,
                        V4L2_CID_POWER_LINE_FREQUENCY_DISABLED);

        if (hdl->error) {
                pr_err("Could not initialize controls\n");
                return hdl->error;
        }

        if (sd->sensor == SENSOR_OV772x)
                v4l2_ctrl_auto_cluster(2, &sd->autogain, 0, true);

        v4l2_ctrl_auto_cluster(2, &sd->autoexposure, V4L2_EXPOSURE_MANUAL,
                               true);

        return 0;
}

/* 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;
        u16 sensor_id;
        static const struct reg_array bridge_init[NSENSORS] = {
        [SENSOR_OV767x] = {bridge_init_767x, ARRAY_SIZE(bridge_init_767x)},
        [SENSOR_OV772x] = {bridge_init_772x, ARRAY_SIZE(bridge_init_772x)},
        };
        static const struct reg_array sensor_init[NSENSORS] = {
        [SENSOR_OV767x] = {sensor_init_767x, ARRAY_SIZE(sensor_init_767x)},
        [SENSOR_OV772x] = {sensor_init_772x, ARRAY_SIZE(sensor_init_772x)},
        };

        /* reset bridge */
        ov534_reg_write(gspca_dev, 0xe7, 0x3a);
        ov534_reg_write(gspca_dev, 0xe0, 0x08);
        msleep(100);

        /* initialize the sensor address */
        ov534_reg_write(gspca_dev, OV534_REG_ADDRESS, 0x42);

        /* reset sensor */
        sccb_reg_write(gspca_dev, 0x12, 0x80);
        usleep_range(10000, 20000);

        /* probe the sensor */
        sccb_reg_read(gspca_dev, 0x0a);
        sensor_id = sccb_reg_read(gspca_dev, 0x0a) << 8;
        sccb_reg_read(gspca_dev, 0x0b);
        sensor_id |= sccb_reg_read(gspca_dev, 0x0b);
        gspca_dbg(gspca_dev, D_PROBE, "Sensor ID: %04x\n", sensor_id);

        if ((sensor_id & 0xfff0) == 0x7670) {
                sd->sensor = SENSOR_OV767x;
                gspca_dev->cam.cam_mode = ov767x_mode;
                gspca_dev->cam.nmodes = ARRAY_SIZE(ov767x_mode);
        } else {
                sd->sensor = SENSOR_OV772x;
                gspca_dev->cam.bulk = 1;
                gspca_dev->cam.bulk_size = 16384;
                gspca_dev->cam.bulk_nurbs = 2;
                gspca_dev->cam.mode_framerates = ov772x_framerates;
        }

        /* initialize */
        reg_w_array(gspca_dev, bridge_init[sd->sensor].val,
                        bridge_init[sd->sensor].len);
        ov534_set_led(gspca_dev, 1);
        sccb_w_array(gspca_dev, sensor_init[sd->sensor].val,
                        sensor_init[sd->sensor].len);

        sd_stopN(gspca_dev);
/*      set_frame_rate(gspca_dev);      */

        return gspca_dev->usb_err;
}

static int sd_start(struct gspca_dev *gspca_dev)
{
        struct sd *sd = (struct sd *) gspca_dev;
        int mode;
        static const struct reg_array bridge_start[NSENSORS][4] = {
        [SENSOR_OV767x] = {{bridge_start_qvga_767x,
                                        ARRAY_SIZE(bridge_start_qvga_767x)},
                        {bridge_start_vga_767x,
                                        ARRAY_SIZE(bridge_start_vga_767x)}},
        [SENSOR_OV772x] = {{bridge_start_qvga_yuyv_772x,
                                ARRAY_SIZE(bridge_start_qvga_yuyv_772x)},
                        {bridge_start_vga_yuyv_772x,
                                ARRAY_SIZE(bridge_start_vga_yuyv_772x)},
                        {bridge_start_qvga_gbrg_772x,
                                ARRAY_SIZE(bridge_start_qvga_gbrg_772x)},
                        {bridge_start_vga_gbrg_772x,
                                ARRAY_SIZE(bridge_start_vga_gbrg_772x)} },
        };
        static const struct reg_array sensor_start[NSENSORS][4] = {
        [SENSOR_OV767x] = {{sensor_start_qvga_767x,
                                        ARRAY_SIZE(sensor_start_qvga_767x)},
                        {sensor_start_vga_767x,
                                        ARRAY_SIZE(sensor_start_vga_767x)}},
        [SENSOR_OV772x] = {{sensor_start_qvga_yuyv_772x,
                                ARRAY_SIZE(sensor_start_qvga_yuyv_772x)},
                        {sensor_start_vga_yuyv_772x,
                                ARRAY_SIZE(sensor_start_vga_yuyv_772x)},
                        {sensor_start_qvga_gbrg_772x,
                                ARRAY_SIZE(sensor_start_qvga_gbrg_772x)},
                        {sensor_start_vga_gbrg_772x,
                                ARRAY_SIZE(sensor_start_vga_gbrg_772x)} },
        };

        /* (from ms-win trace) */
        if (sd->sensor == SENSOR_OV767x)
                sccb_reg_write(gspca_dev, 0x1e, 0x04);
                                        /* black sun enable ? */

        mode = gspca_dev->curr_mode;    /* 0: 320x240, 1: 640x480 */
        reg_w_array(gspca_dev, bridge_start[sd->sensor][mode].val,
                                bridge_start[sd->sensor][mode].len);
        sccb_w_array(gspca_dev, sensor_start[sd->sensor][mode].val,
                                sensor_start[sd->sensor][mode].len);

        set_frame_rate(gspca_dev);

        if (sd->hue)
                sethue(gspca_dev, v4l2_ctrl_g_ctrl(sd->hue));
        setsaturation(gspca_dev, v4l2_ctrl_g_ctrl(sd->saturation));
        if (sd->autogain)
                setagc(gspca_dev, v4l2_ctrl_g_ctrl(sd->autogain));
        setawb(gspca_dev, v4l2_ctrl_g_ctrl(sd->autowhitebalance));
        setaec(gspca_dev, v4l2_ctrl_g_ctrl(sd->autoexposure));
        if (sd->gain)
                setgain(gspca_dev, v4l2_ctrl_g_ctrl(sd->gain));
        setexposure(gspca_dev, v4l2_ctrl_g_ctrl(sd->exposure));
        setbrightness(gspca_dev, v4l2_ctrl_g_ctrl(sd->brightness));
        setcontrast(gspca_dev, v4l2_ctrl_g_ctrl(sd->contrast));
        if (sd->sharpness)
                setsharpness(gspca_dev, v4l2_ctrl_g_ctrl(sd->sharpness));
        sethvflip(gspca_dev, v4l2_ctrl_g_ctrl(sd->hflip),
                  v4l2_ctrl_g_ctrl(sd->vflip));
        setlightfreq(gspca_dev, v4l2_ctrl_g_ctrl(sd->plfreq));

        ov534_set_led(gspca_dev, 1);
        ov534_reg_write(gspca_dev, 0xe0, 0x00);
        return gspca_dev->usb_err;
}

static void sd_stopN(struct gspca_dev *gspca_dev)
{
        ov534_reg_write(gspca_dev, 0xe0, 0x09);
        ov534_set_led(gspca_dev, 0);
}

/* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */
#define UVC_STREAM_EOH  (1 << 7)
#define UVC_STREAM_ERR  (1 << 6)
#define UVC_STREAM_STI  (1 << 5)
#define UVC_STREAM_RES  (1 << 4)
#define UVC_STREAM_SCR  (1 << 3)
#define UVC_STREAM_PTS  (1 << 2)
#define UVC_STREAM_EOF  (1 << 1)
#define UVC_STREAM_FID  (1 << 0)

static void sd_pkt_scan(struct gspca_dev *gspca_dev,
                        u8 *data, int len)
{
        struct sd *sd = (struct sd *) gspca_dev;
        __u32 this_pts;
        u16 this_fid;
        int remaining_len = len;
        int payload_len;

        payload_len = gspca_dev->cam.bulk ? 2048 : 2040;
        do {
                len = min(remaining_len, payload_len);

                /* Payloads are prefixed with a UVC-style header.  We
                   consider a frame to start when the FID toggles, or the PTS
                   changes.  A frame ends when EOF is set, and we've received
                   the correct number of bytes. */

                /* Verify UVC header.  Header length is always 12 */
                if (data[0] != 12 || len < 12) {
                        gspca_dbg(gspca_dev, D_PACK, "bad header\n");
                        goto discard;
                }

                /* Check errors */
                if (data[1] & UVC_STREAM_ERR) {
                        gspca_dbg(gspca_dev, D_PACK, "payload error\n");
                        goto discard;
                }

                /* Extract PTS and FID */
                if (!(data[1] & UVC_STREAM_PTS)) {
                        gspca_dbg(gspca_dev, D_PACK, "PTS not present\n");
                        goto discard;
                }
                this_pts = (data[5] << 24) | (data[4] << 16)
                                                | (data[3] << 8) | data[2];
                this_fid = (data[1] & UVC_STREAM_FID) ? 1 : 0;

                /* If PTS or FID has changed, start a new frame. */
                if (this_pts != sd->last_pts || this_fid != sd->last_fid) {
                        if (gspca_dev->last_packet_type == INTER_PACKET)
                                gspca_frame_add(gspca_dev, LAST_PACKET,
                                                NULL, 0);
                        sd->last_pts = this_pts;
                        sd->last_fid = this_fid;
                        gspca_frame_add(gspca_dev, FIRST_PACKET,
                                        data + 12, len - 12);
                /* If this packet is marked as EOF, end the frame */
                } else if (data[1] & UVC_STREAM_EOF) {
                        sd->last_pts = 0;
                        if (gspca_dev->pixfmt.pixelformat != V4L2_PIX_FMT_JPEG
                         && gspca_dev->image_len + len - 12 !=
                            gspca_dev->pixfmt.sizeimage) {
                                gspca_dbg(gspca_dev, D_PACK, "wrong sized frame\n");
                                goto discard;
                        }
                        gspca_frame_add(gspca_dev, LAST_PACKET,
                                        data + 12, len - 12);
                } else {

                        /* Add the data from this payload */
                        gspca_frame_add(gspca_dev, INTER_PACKET,
                                        data + 12, len - 12);
                }

                /* Done this payload */
                goto scan_next;

discard:
                /* Discard data until a new frame starts. */
                gspca_dev->last_packet_type = DISCARD_PACKET;

scan_next:
                remaining_len -= len;
                data += len;
        } while (remaining_len > 0);
}

/* get stream parameters (framerate) */
static void sd_get_streamparm(struct gspca_dev *gspca_dev,
                             struct v4l2_streamparm *parm)
{
        struct v4l2_captureparm *cp = &parm->parm.capture;
        struct v4l2_fract *tpf = &cp->timeperframe;
        struct sd *sd = (struct sd *) gspca_dev;

        tpf->numerator = 1;
        tpf->denominator = sd->frame_rate;
}

/* set stream parameters (framerate) */
static void sd_set_streamparm(struct gspca_dev *gspca_dev,
                             struct v4l2_streamparm *parm)
{
        struct v4l2_captureparm *cp = &parm->parm.capture;
        struct v4l2_fract *tpf = &cp->timeperframe;
        struct sd *sd = (struct sd *) gspca_dev;

        if (tpf->numerator == 0 || tpf->denominator == 0)
                sd->frame_rate = DEFAULT_FRAME_RATE;
        else
                sd->frame_rate = tpf->denominator / tpf->numerator;

        if (gspca_dev->streaming)
                set_frame_rate(gspca_dev);

        /* Return the actual framerate */
        tpf->numerator = 1;
        tpf->denominator = sd->frame_rate;
}

/* sub-driver description */
static const struct sd_desc sd_desc = {
        .name     = MODULE_NAME,
        .config   = sd_config,
        .init     = sd_init,
        .init_controls = sd_init_controls,
        .start    = sd_start,
        .stopN    = sd_stopN,
        .pkt_scan = sd_pkt_scan,
        .get_streamparm = sd_get_streamparm,
        .set_streamparm = sd_set_streamparm,
};

/* -- module initialisation -- */
static const struct usb_device_id device_table[] = {
        {USB_DEVICE(0x1415, 0x2000)},
        {USB_DEVICE(0x06f8, 0x3002)},
        {}
};

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,
        .reset_resume = gspca_resume,
#endif
};

module_usb_driver(sd_driver);