// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Etoms Et61x151 GPL Linux driver by Michel Xhaard (09/09/2004)
 *
 * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define MODULE_NAME "etoms"

#include "gspca.h"

MODULE_AUTHOR("Michel Xhaard <mxhaard@users.sourceforge.net>");
MODULE_DESCRIPTION("Etoms USB Camera Driver");
MODULE_LICENSE("GPL");

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

        unsigned char autogain;

        char sensor;
#define SENSOR_PAS106 0
#define SENSOR_TAS5130CXX 1
        signed char ag_cnt;
#define AG_CNT_START 13
};

static const struct v4l2_pix_format vga_mode[] = {
        {320, 240, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
                .bytesperline = 320,
                .sizeimage = 320 * 240,
                .colorspace = V4L2_COLORSPACE_SRGB,
                .priv = 1},
/*      {640, 480, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
                .bytesperline = 640,
                .sizeimage = 640 * 480,
                .colorspace = V4L2_COLORSPACE_SRGB,
                .priv = 0}, */
};

static const struct v4l2_pix_format sif_mode[] = {
        {176, 144, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
                .bytesperline = 176,
                .sizeimage = 176 * 144,
                .colorspace = V4L2_COLORSPACE_SRGB,
                .priv = 1},
        {352, 288, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
                .bytesperline = 352,
                .sizeimage = 352 * 288,
                .colorspace = V4L2_COLORSPACE_SRGB,
                .priv = 0},
};

#define ETOMS_ALT_SIZE_1000   12

#define ET_GPIO_DIR_CTRL 0x04   /* Control IO bit[0..5] (0 in  1 out) */
#define ET_GPIO_OUT 0x05        /* Only IO data */
#define ET_GPIO_IN 0x06         /* Read Only IO data */
#define ET_RESET_ALL 0x03
#define ET_ClCK 0x01
#define ET_CTRL 0x02            /* enable i2c OutClck Powerdown mode */

#define ET_COMP 0x12            /* Compression register */
#define ET_MAXQt 0x13
#define ET_MINQt 0x14
#define ET_COMP_VAL0 0x02
#define ET_COMP_VAL1 0x03

#define ET_REG1d 0x1d
#define ET_REG1e 0x1e
#define ET_REG1f 0x1f
#define ET_REG20 0x20
#define ET_REG21 0x21
#define ET_REG22 0x22
#define ET_REG23 0x23
#define ET_REG24 0x24
#define ET_REG25 0x25
/* base registers for luma calculation */
#define ET_LUMA_CENTER 0x39

#define ET_G_RED 0x4d
#define ET_G_GREEN1 0x4e
#define ET_G_BLUE 0x4f
#define ET_G_GREEN2 0x50
#define ET_G_GR_H 0x51
#define ET_G_GB_H 0x52

#define ET_O_RED 0x34
#define ET_O_GREEN1 0x35
#define ET_O_BLUE 0x36
#define ET_O_GREEN2 0x37

#define ET_SYNCHRO 0x68
#define ET_STARTX 0x69
#define ET_STARTY 0x6a
#define ET_WIDTH_LOW 0x6b
#define ET_HEIGTH_LOW 0x6c
#define ET_W_H_HEIGTH 0x6d

#define ET_REG6e 0x6e           /* OBW */
#define ET_REG6f 0x6f           /* OBW */
#define ET_REG70 0x70           /* OBW_AWB */
#define ET_REG71 0x71           /* OBW_AWB */
#define ET_REG72 0x72           /* OBW_AWB */
#define ET_REG73 0x73           /* Clkdelay ns */
#define ET_REG74 0x74           /* test pattern */
#define ET_REG75 0x75           /* test pattern */

#define ET_I2C_CLK 0x8c
#define ET_PXL_CLK 0x60

#define ET_I2C_BASE 0x89
#define ET_I2C_COUNT 0x8a
#define ET_I2C_PREFETCH 0x8b
#define ET_I2C_REG 0x88
#define ET_I2C_DATA7 0x87
#define ET_I2C_DATA6 0x86
#define ET_I2C_DATA5 0x85
#define ET_I2C_DATA4 0x84
#define ET_I2C_DATA3 0x83
#define ET_I2C_DATA2 0x82
#define ET_I2C_DATA1 0x81
#define ET_I2C_DATA0 0x80

#define PAS106_REG2 0x02        /* pxlClk = systemClk/(reg2) */
#define PAS106_REG3 0x03        /* line/frame H [11..4] */
#define PAS106_REG4 0x04        /* line/frame L [3..0] */
#define PAS106_REG5 0x05        /* exposure time line offset(default 5) */
#define PAS106_REG6 0x06        /* exposure time pixel offset(default 6) */
#define PAS106_REG7 0x07        /* signbit Dac (default 0) */
#define PAS106_REG9 0x09
#define PAS106_REG0e 0x0e       /* global gain [4..0](default 0x0e) */
#define PAS106_REG13 0x13       /* end i2c write */

static const __u8 GainRGBG[] = { 0x80, 0x80, 0x80, 0x80, 0x00, 0x00 };

static const __u8 I2c2[] = { 0x08, 0x08, 0x08, 0x08, 0x0d };

static const __u8 I2c3[] = { 0x12, 0x05 };

static const __u8 I2c4[] = { 0x41, 0x08 };

/* read 'len' bytes to gspca_dev->usb_buf */
static void reg_r(struct gspca_dev *gspca_dev,
                  __u16 index,
                  __u16 len)
{
        struct usb_device *dev = gspca_dev->dev;

        if (len > USB_BUF_SZ) {
                gspca_err(gspca_dev, "reg_r: buffer overflow\n");
                return;
        }

        usb_control_msg(dev,
                        usb_rcvctrlpipe(dev, 0),
                        0,
                        USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
                        0,
                        index, gspca_dev->usb_buf, len, 500);
        gspca_dbg(gspca_dev, D_USBI, "reg read [%02x] -> %02x ..\n",
                  index, gspca_dev->usb_buf[0]);
}

static void reg_w_val(struct gspca_dev *gspca_dev,
                        __u16 index,
                        __u8 val)
{
        struct usb_device *dev = gspca_dev->dev;

        gspca_dev->usb_buf[0] = val;
        usb_control_msg(dev,
                        usb_sndctrlpipe(dev, 0),
                        0,
                        USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
                        0,
                        index, gspca_dev->usb_buf, 1, 500);
}

static void reg_w(struct gspca_dev *gspca_dev,
                  __u16 index,
                  const __u8 *buffer,
                  __u16 len)
{
        struct usb_device *dev = gspca_dev->dev;

        if (len > USB_BUF_SZ) {
                pr_err("reg_w: buffer overflow\n");
                return;
        }
        gspca_dbg(gspca_dev, D_USBO, "reg write [%02x] = %02x..\n",
                  index, *buffer);

        memcpy(gspca_dev->usb_buf, buffer, len);
        usb_control_msg(dev,
                        usb_sndctrlpipe(dev, 0),
                        0,
                        USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
                        0, index, gspca_dev->usb_buf, len, 500);
}

static int i2c_w(struct gspca_dev *gspca_dev,
                 __u8 reg,
                 const __u8 *buffer,
                 int len, __u8 mode)
{
        /* buffer should be [D0..D7] */
        __u8 ptchcount;

        /* set the base address */
        reg_w_val(gspca_dev, ET_I2C_BASE, 0x40);
                                         /* sensor base for the pas106 */
        /* set count and prefetch */
        ptchcount = ((len & 0x07) << 4) | (mode & 0x03);
        reg_w_val(gspca_dev, ET_I2C_COUNT, ptchcount);
        /* set the register base */
        reg_w_val(gspca_dev, ET_I2C_REG, reg);
        while (--len >= 0)
                reg_w_val(gspca_dev, ET_I2C_DATA0 + len, buffer[len]);
        return 0;
}

static int i2c_r(struct gspca_dev *gspca_dev,
                        __u8 reg)
{
        /* set the base address */
        reg_w_val(gspca_dev, ET_I2C_BASE, 0x40);
                                        /* sensor base for the pas106 */
        /* set count and prefetch (cnd: 4 bits - mode: 4 bits) */
        reg_w_val(gspca_dev, ET_I2C_COUNT, 0x11);
        reg_w_val(gspca_dev, ET_I2C_REG, reg);  /* set the register base */
        reg_w_val(gspca_dev, ET_I2C_PREFETCH, 0x02);    /* prefetch */
        reg_w_val(gspca_dev, ET_I2C_PREFETCH, 0x00);
        reg_r(gspca_dev, ET_I2C_DATA0, 1);      /* read one byte */
        return 0;
}

static int Et_WaitStatus(struct gspca_dev *gspca_dev)
{
        int retry = 10;

        while (retry--) {
                reg_r(gspca_dev, ET_ClCK, 1);
                if (gspca_dev->usb_buf[0] != 0)
                        return 1;
        }
        return 0;
}

static int et_video(struct gspca_dev *gspca_dev,
                    int on)
{
        int ret;

        reg_w_val(gspca_dev, ET_GPIO_OUT,
                  on ? 0x10             /* startvideo - set Bit5 */
                     : 0);              /* stopvideo */
        ret = Et_WaitStatus(gspca_dev);
        if (ret != 0)
                gspca_err(gspca_dev, "timeout video on/off\n");
        return ret;
}

static void Et_init2(struct gspca_dev *gspca_dev)
{
        __u8 value;
        static const __u8 FormLine[] = { 0x84, 0x03, 0x14, 0xf4, 0x01, 0x05 };

        gspca_dbg(gspca_dev, D_STREAM, "Open Init2 ET\n");
        reg_w_val(gspca_dev, ET_GPIO_DIR_CTRL, 0x2f);
        reg_w_val(gspca_dev, ET_GPIO_OUT, 0x10);
        reg_r(gspca_dev, ET_GPIO_IN, 1);
        reg_w_val(gspca_dev, ET_ClCK, 0x14); /* 0x14 // 0x16 enabled pattern */
        reg_w_val(gspca_dev, ET_CTRL, 0x1b);

        /*  compression et subsampling */
        if (gspca_dev->cam.cam_mode[(int) gspca_dev->curr_mode].priv)
                value = ET_COMP_VAL1;   /* 320 */
        else
                value = ET_COMP_VAL0;   /* 640 */
        reg_w_val(gspca_dev, ET_COMP, value);
        reg_w_val(gspca_dev, ET_MAXQt, 0x1f);
        reg_w_val(gspca_dev, ET_MINQt, 0x04);
        /* undocumented registers */
        reg_w_val(gspca_dev, ET_REG1d, 0xff);
        reg_w_val(gspca_dev, ET_REG1e, 0xff);
        reg_w_val(gspca_dev, ET_REG1f, 0xff);
        reg_w_val(gspca_dev, ET_REG20, 0x35);
        reg_w_val(gspca_dev, ET_REG21, 0x01);
        reg_w_val(gspca_dev, ET_REG22, 0x00);
        reg_w_val(gspca_dev, ET_REG23, 0xff);
        reg_w_val(gspca_dev, ET_REG24, 0xff);
        reg_w_val(gspca_dev, ET_REG25, 0x0f);
        /* colors setting */
        reg_w_val(gspca_dev, 0x30, 0x11);               /* 0x30 */
        reg_w_val(gspca_dev, 0x31, 0x40);
        reg_w_val(gspca_dev, 0x32, 0x00);
        reg_w_val(gspca_dev, ET_O_RED, 0x00);           /* 0x34 */
        reg_w_val(gspca_dev, ET_O_GREEN1, 0x00);
        reg_w_val(gspca_dev, ET_O_BLUE, 0x00);
        reg_w_val(gspca_dev, ET_O_GREEN2, 0x00);
        /*************/
        reg_w_val(gspca_dev, ET_G_RED, 0x80);           /* 0x4d */
        reg_w_val(gspca_dev, ET_G_GREEN1, 0x80);
        reg_w_val(gspca_dev, ET_G_BLUE, 0x80);
        reg_w_val(gspca_dev, ET_G_GREEN2, 0x80);
        reg_w_val(gspca_dev, ET_G_GR_H, 0x00);
        reg_w_val(gspca_dev, ET_G_GB_H, 0x00);          /* 0x52 */
        /* Window control registers */
        reg_w_val(gspca_dev, 0x61, 0x80);               /* use cmc_out */
        reg_w_val(gspca_dev, 0x62, 0x02);
        reg_w_val(gspca_dev, 0x63, 0x03);
        reg_w_val(gspca_dev, 0x64, 0x14);
        reg_w_val(gspca_dev, 0x65, 0x0e);
        reg_w_val(gspca_dev, 0x66, 0x02);
        reg_w_val(gspca_dev, 0x67, 0x02);

        /**************************************/
        reg_w_val(gspca_dev, ET_SYNCHRO, 0x8f);         /* 0x68 */
        reg_w_val(gspca_dev, ET_STARTX, 0x69);          /* 0x6a //0x69 */
        reg_w_val(gspca_dev, ET_STARTY, 0x0d);          /* 0x0d //0x0c */
        reg_w_val(gspca_dev, ET_WIDTH_LOW, 0x80);
        reg_w_val(gspca_dev, ET_HEIGTH_LOW, 0xe0);
        reg_w_val(gspca_dev, ET_W_H_HEIGTH, 0x60);      /* 6d */
        reg_w_val(gspca_dev, ET_REG6e, 0x86);
        reg_w_val(gspca_dev, ET_REG6f, 0x01);
        reg_w_val(gspca_dev, ET_REG70, 0x26);
        reg_w_val(gspca_dev, ET_REG71, 0x7a);
        reg_w_val(gspca_dev, ET_REG72, 0x01);
        /* Clock Pattern registers ***************** */
        reg_w_val(gspca_dev, ET_REG73, 0x00);
        reg_w_val(gspca_dev, ET_REG74, 0x18);           /* 0x28 */
        reg_w_val(gspca_dev, ET_REG75, 0x0f);           /* 0x01 */
        /**********************************************/
        reg_w_val(gspca_dev, 0x8a, 0x20);
        reg_w_val(gspca_dev, 0x8d, 0x0f);
        reg_w_val(gspca_dev, 0x8e, 0x08);
        /**************************************/
        reg_w_val(gspca_dev, 0x03, 0x08);
        reg_w_val(gspca_dev, ET_PXL_CLK, 0x03);
        reg_w_val(gspca_dev, 0x81, 0xff);
        reg_w_val(gspca_dev, 0x80, 0x00);
        reg_w_val(gspca_dev, 0x81, 0xff);
        reg_w_val(gspca_dev, 0x80, 0x20);
        reg_w_val(gspca_dev, 0x03, 0x01);
        reg_w_val(gspca_dev, 0x03, 0x00);
        reg_w_val(gspca_dev, 0x03, 0x08);
        /********************************************/

/*      reg_r(gspca_dev, ET_I2C_BASE, 1);
                                         always 0x40 as the pas106 ??? */
        /* set the sensor */
        if (gspca_dev->cam.cam_mode[(int) gspca_dev->curr_mode].priv)
                value = 0x04;           /* 320 */
        else                            /* 640 */
                value = 0x1e;   /* 0x17  * setting PixelClock
                                         * 0x03 mean 24/(3+1) = 6 Mhz
                                         * 0x05 -> 24/(5+1) = 4 Mhz
                                         * 0x0b -> 24/(11+1) = 2 Mhz
                                         * 0x17 -> 24/(23+1) = 1 Mhz
                                         */
        reg_w_val(gspca_dev, ET_PXL_CLK, value);
        /* now set by fifo the FormatLine setting */
        reg_w(gspca_dev, 0x62, FormLine, 6);

        /* set exposure times [ 0..0x78] 0->longvalue 0x78->shortvalue */
        reg_w_val(gspca_dev, 0x81, 0x47);       /* 0x47; */
        reg_w_val(gspca_dev, 0x80, 0x40);       /* 0x40; */
        /* Pedro change */
        /* Brightness change Brith+ decrease value */
        /* Brigth- increase value */
        /* original value = 0x70; */
        reg_w_val(gspca_dev, 0x81, 0x30);       /* 0x20; - set brightness */
        reg_w_val(gspca_dev, 0x80, 0x20);       /* 0x20; */
}

static void setbrightness(struct gspca_dev *gspca_dev, s32 val)
{
        int i;

        for (i = 0; i < 4; i++)
                reg_w_val(gspca_dev, ET_O_RED + i, val);
}

static void setcontrast(struct gspca_dev *gspca_dev, s32 val)
{
        __u8 RGBG[] = { 0x80, 0x80, 0x80, 0x80, 0x00, 0x00 };

        memset(RGBG, val, sizeof(RGBG) - 2);
        reg_w(gspca_dev, ET_G_RED, RGBG, 6);
}

static void setcolors(struct gspca_dev *gspca_dev, s32 val)
{
        struct sd *sd = (struct sd *) gspca_dev;
        __u8 I2cc[] = { 0x05, 0x02, 0x02, 0x05, 0x0d };
        __u8 i2cflags = 0x01;
        /* __u8 green = 0; */

        I2cc[3] = val;  /* red */
        I2cc[0] = 15 - val;     /* blue */
        /* green = 15 - ((((7*I2cc[0]) >> 2 ) + I2cc[3]) >> 1); */
        /* I2cc[1] = I2cc[2] = green; */
        if (sd->sensor == SENSOR_PAS106) {
                i2c_w(gspca_dev, PAS106_REG13, &i2cflags, 1, 3);
                i2c_w(gspca_dev, PAS106_REG9, I2cc, sizeof I2cc, 1);
        }
}

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

        if (sd->sensor == SENSOR_PAS106) {
/*              i2c_r(gspca_dev, PAS106_REG9);           * blue */
                i2c_r(gspca_dev, PAS106_REG9 + 3);      /* red */
                return gspca_dev->usb_buf[0] & 0x0f;
        }
        return 0;
}

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

        if (sd->autogain)
                sd->ag_cnt = AG_CNT_START;
        else
                sd->ag_cnt = -1;
}

static void Et_init1(struct gspca_dev *gspca_dev)
{
        __u8 value;
/*      __u8 I2c0 [] = {0x0a, 0x12, 0x05, 0x22, 0xac, 0x00, 0x01, 0x00}; */
        __u8 I2c0[] = { 0x0a, 0x12, 0x05, 0x6d, 0xcd, 0x00, 0x01, 0x00 };
                                                /* try 1/120 0x6d 0xcd 0x40 */
/*      __u8 I2c0 [] = {0x0a, 0x12, 0x05, 0xfe, 0xfe, 0xc0, 0x01, 0x00};
                                                 * 1/60000 hmm ?? */

        gspca_dbg(gspca_dev, D_STREAM, "Open Init1 ET\n\n");
        reg_w_val(gspca_dev, ET_GPIO_DIR_CTRL, 7);
        reg_r(gspca_dev, ET_GPIO_IN, 1);
        reg_w_val(gspca_dev, ET_RESET_ALL, 1);
        reg_w_val(gspca_dev, ET_RESET_ALL, 0);
        reg_w_val(gspca_dev, ET_ClCK, 0x10);
        reg_w_val(gspca_dev, ET_CTRL, 0x19);
        /*   compression et subsampling */
        if (gspca_dev->cam.cam_mode[(int) gspca_dev->curr_mode].priv)
                value = ET_COMP_VAL1;
        else
                value = ET_COMP_VAL0;
        gspca_dbg(gspca_dev, D_STREAM, "Open mode %d Compression %d\n",
                  gspca_dev->cam.cam_mode[(int) gspca_dev->curr_mode].priv,
                  value);
        reg_w_val(gspca_dev, ET_COMP, value);
        reg_w_val(gspca_dev, ET_MAXQt, 0x1d);
        reg_w_val(gspca_dev, ET_MINQt, 0x02);
        /* undocumented registers */
        reg_w_val(gspca_dev, ET_REG1d, 0xff);
        reg_w_val(gspca_dev, ET_REG1e, 0xff);
        reg_w_val(gspca_dev, ET_REG1f, 0xff);
        reg_w_val(gspca_dev, ET_REG20, 0x35);
        reg_w_val(gspca_dev, ET_REG21, 0x01);
        reg_w_val(gspca_dev, ET_REG22, 0x00);
        reg_w_val(gspca_dev, ET_REG23, 0xf7);
        reg_w_val(gspca_dev, ET_REG24, 0xff);
        reg_w_val(gspca_dev, ET_REG25, 0x07);
        /* colors setting */
        reg_w_val(gspca_dev, ET_G_RED, 0x80);
        reg_w_val(gspca_dev, ET_G_GREEN1, 0x80);
        reg_w_val(gspca_dev, ET_G_BLUE, 0x80);
        reg_w_val(gspca_dev, ET_G_GREEN2, 0x80);
        reg_w_val(gspca_dev, ET_G_GR_H, 0x00);
        reg_w_val(gspca_dev, ET_G_GB_H, 0x00);
        /* Window control registers */
        reg_w_val(gspca_dev, ET_SYNCHRO, 0xf0);
        reg_w_val(gspca_dev, ET_STARTX, 0x56);          /* 0x56 */
        reg_w_val(gspca_dev, ET_STARTY, 0x05);          /* 0x04 */
        reg_w_val(gspca_dev, ET_WIDTH_LOW, 0x60);
        reg_w_val(gspca_dev, ET_HEIGTH_LOW, 0x20);
        reg_w_val(gspca_dev, ET_W_H_HEIGTH, 0x50);
        reg_w_val(gspca_dev, ET_REG6e, 0x86);
        reg_w_val(gspca_dev, ET_REG6f, 0x01);
        reg_w_val(gspca_dev, ET_REG70, 0x86);
        reg_w_val(gspca_dev, ET_REG71, 0x14);
        reg_w_val(gspca_dev, ET_REG72, 0x00);
        /* Clock Pattern registers */
        reg_w_val(gspca_dev, ET_REG73, 0x00);
        reg_w_val(gspca_dev, ET_REG74, 0x00);
        reg_w_val(gspca_dev, ET_REG75, 0x0a);
        reg_w_val(gspca_dev, ET_I2C_CLK, 0x04);
        reg_w_val(gspca_dev, ET_PXL_CLK, 0x01);
        /* set the sensor */
        if (gspca_dev->cam.cam_mode[(int) gspca_dev->curr_mode].priv) {
                I2c0[0] = 0x06;
                i2c_w(gspca_dev, PAS106_REG2, I2c0, sizeof I2c0, 1);
                i2c_w(gspca_dev, PAS106_REG9, I2c2, sizeof I2c2, 1);
                value = 0x06;
                i2c_w(gspca_dev, PAS106_REG2, &value, 1, 1);
                i2c_w(gspca_dev, PAS106_REG3, I2c3, sizeof I2c3, 1);
                /* value = 0x1f; */
                value = 0x04;
                i2c_w(gspca_dev, PAS106_REG0e, &value, 1, 1);
        } else {
                I2c0[0] = 0x0a;

                i2c_w(gspca_dev, PAS106_REG2, I2c0, sizeof I2c0, 1);
                i2c_w(gspca_dev, PAS106_REG9, I2c2, sizeof I2c2, 1);
                value = 0x0a;
                i2c_w(gspca_dev, PAS106_REG2, &value, 1, 1);
                i2c_w(gspca_dev, PAS106_REG3, I2c3, sizeof I2c3, 1);
                value = 0x04;
                /* value = 0x10; */
                i2c_w(gspca_dev, PAS106_REG0e, &value, 1, 1);
                /* bit 2 enable bit 1:2 select 0 1 2 3
                   value = 0x07;                                * curve 0 *
                   i2c_w(gspca_dev, PAS106_REG0f, &value, 1, 1);
                 */
        }

/*      value = 0x01; */
/*      value = 0x22; */
/*      i2c_w(gspca_dev, PAS106_REG5, &value, 1, 1); */
        /* magnetude and sign bit for DAC */
        i2c_w(gspca_dev, PAS106_REG7, I2c4, sizeof I2c4, 1);
        /* now set by fifo the whole colors setting */
        reg_w(gspca_dev, ET_G_RED, GainRGBG, 6);
        setcolors(gspca_dev, getcolors(gspca_dev));
}

/* 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;
        sd->sensor = id->driver_info;
        if (sd->sensor == SENSOR_PAS106) {
                cam->cam_mode = sif_mode;
                cam->nmodes = ARRAY_SIZE(sif_mode);
        } else {
                cam->cam_mode = vga_mode;
                cam->nmodes = ARRAY_SIZE(vga_mode);
        }
        sd->ag_cnt = -1;
        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;

        if (sd->sensor == SENSOR_PAS106)
                Et_init1(gspca_dev);
        else
                Et_init2(gspca_dev);
        reg_w_val(gspca_dev, ET_RESET_ALL, 0x08);
        et_video(gspca_dev, 0);         /* video off */
        return 0;
}

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

        if (sd->sensor == SENSOR_PAS106)
                Et_init1(gspca_dev);
        else
                Et_init2(gspca_dev);

        setautogain(gspca_dev);

        reg_w_val(gspca_dev, ET_RESET_ALL, 0x08);
        et_video(gspca_dev, 1);         /* video on */
        return 0;
}

static void sd_stopN(struct gspca_dev *gspca_dev)
{
        et_video(gspca_dev, 0);         /* video off */
}

static __u8 Et_getgainG(struct gspca_dev *gspca_dev)
{
        struct sd *sd = (struct sd *) gspca_dev;

        if (sd->sensor == SENSOR_PAS106) {
                i2c_r(gspca_dev, PAS106_REG0e);
                gspca_dbg(gspca_dev, D_CONF, "Etoms gain G %d\n",
                          gspca_dev->usb_buf[0]);
                return gspca_dev->usb_buf[0];
        }
        return 0x1f;
}

static void Et_setgainG(struct gspca_dev *gspca_dev, __u8 gain)
{
        struct sd *sd = (struct sd *) gspca_dev;

        if (sd->sensor == SENSOR_PAS106) {
                __u8 i2cflags = 0x01;

                i2c_w(gspca_dev, PAS106_REG13, &i2cflags, 1, 3);
                i2c_w(gspca_dev, PAS106_REG0e, &gain, 1, 1);
        }
}

#define BLIMIT(bright) \
        (u8)((bright > 0x1f) ? 0x1f : ((bright < 4) ? 3 : bright))
#define LIMIT(color) \
        (u8)((color > 0xff) ? 0xff : ((color < 0) ? 0 : color))

static void do_autogain(struct gspca_dev *gspca_dev)
{
        struct sd *sd = (struct sd *) gspca_dev;
        __u8 luma;
        __u8 luma_mean = 128;
        __u8 luma_delta = 20;
        __u8 spring = 4;
        int Gbright;
        __u8 r, g, b;

        if (sd->ag_cnt < 0)
                return;
        if (--sd->ag_cnt >= 0)
                return;
        sd->ag_cnt = AG_CNT_START;

        Gbright = Et_getgainG(gspca_dev);
        reg_r(gspca_dev, ET_LUMA_CENTER, 4);
        g = (gspca_dev->usb_buf[0] + gspca_dev->usb_buf[3]) >> 1;
        r = gspca_dev->usb_buf[1];
        b = gspca_dev->usb_buf[2];
        r = ((r << 8) - (r << 4) - (r << 3)) >> 10;
        b = ((b << 7) >> 10);
        g = ((g << 9) + (g << 7) + (g << 5)) >> 10;
        luma = LIMIT(r + g + b);
        gspca_dbg(gspca_dev, D_FRAM, "Etoms luma G %d\n", luma);
        if (luma < luma_mean - luma_delta || luma > luma_mean + luma_delta) {
                Gbright += (luma_mean - luma) >> spring;
                Gbright = BLIMIT(Gbright);
                gspca_dbg(gspca_dev, D_FRAM, "Etoms Gbright %d\n", Gbright);
                Et_setgainG(gspca_dev, (__u8) Gbright);
        }
}

#undef BLIMIT
#undef LIMIT

static void sd_pkt_scan(struct gspca_dev *gspca_dev,
                        u8 *data,                       /* isoc packet */
                        int len)                        /* iso packet length */
{
        int seqframe;

        seqframe = data[0] & 0x3f;
        len = (int) (((data[0] & 0xc0) << 2) | data[1]);
        if (seqframe == 0x3f) {
                gspca_dbg(gspca_dev, D_FRAM,
                          "header packet found datalength %d !!\n", len);
                gspca_dbg(gspca_dev, D_FRAM, "G %d R %d G %d B %d",
                          data[2], data[3], data[4], data[5]);
                data += 30;
                /* don't change datalength as the chips provided it */
                gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
                gspca_frame_add(gspca_dev, FIRST_PACKET, data, len);
                return;
        }
        if (len) {
                data += 8;
                gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
        } else {                        /* Drop Packet */
                gspca_dev->last_packet_type = DISCARD_PACKET;
        }
}

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

        gspca_dev->usb_err = 0;

        if (!gspca_dev->streaming)
                return 0;

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
                setbrightness(gspca_dev, ctrl->val);
                break;
        case V4L2_CID_CONTRAST:
                setcontrast(gspca_dev, ctrl->val);
                break;
        case V4L2_CID_SATURATION:
                setcolors(gspca_dev, ctrl->val);
                break;
        case V4L2_CID_AUTOGAIN:
                sd->autogain = ctrl->val;
                setautogain(gspca_dev);
                break;
        }
        return gspca_dev->usb_err;
}

static const struct v4l2_ctrl_ops sd_ctrl_ops = {
        .s_ctrl = sd_s_ctrl,
};

static int sd_init_controls(struct gspca_dev *gspca_dev)
{
        struct sd *sd = (struct sd *)gspca_dev;
        struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;

        gspca_dev->vdev.ctrl_handler = hdl;
        v4l2_ctrl_handler_init(hdl, 4);
        v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
                        V4L2_CID_BRIGHTNESS, 1, 127, 1, 63);
        v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
                        V4L2_CID_CONTRAST, 0, 255, 1, 127);
        if (sd->sensor == SENSOR_PAS106)
                v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
                        V4L2_CID_SATURATION, 0, 15, 1, 7);
        v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
                        V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
        if (hdl->error) {
                pr_err("Could not initialize controls\n");
                return hdl->error;
        }
        return 0;
}

/* 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,
        .dq_callback = do_autogain,
};

/* -- module initialisation -- */
static const struct usb_device_id device_table[] = {
        {USB_DEVICE(0x102c, 0x6151), .driver_info = SENSOR_PAS106},
        {USB_DEVICE(0x102c, 0x6251), .driver_info = SENSOR_TAS5130CXX},
        {}
};

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);