// SPDX-License-Identifier: GPL-2.0-only

/*
 * Driver for the ov9650 sensor
 *
 * Copyright (C) 2008 Erik Andrén
 * Copyright (C) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project.
 * Copyright (C) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br>
 *
 * Portions of code to USB interface and ALi driver software,
 * Copyright (c) 2006 Willem Duinker
 * v4l2 interface modeled after the V4L2 driver
 * for SN9C10x PC Camera Controllers
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include "m5602_ov9650.h"

static int ov9650_s_ctrl(struct v4l2_ctrl *ctrl);
static void ov9650_dump_registers(struct sd *sd);

static const unsigned char preinit_ov9650[][3] = {
        /* [INITCAM] */
        {BRIDGE, M5602_XB_MCU_CLK_DIV, 0x02},
        {BRIDGE, M5602_XB_MCU_CLK_CTRL, 0xb0},
        {BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
        {BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
        {BRIDGE, M5602_XB_ADC_CTRL, 0xc0},
        {BRIDGE, M5602_XB_SENSOR_CTRL, 0x00},

        {BRIDGE, M5602_XB_SENSOR_TYPE, 0x08},
        {BRIDGE, M5602_XB_GPIO_DIR, 0x05},
        {BRIDGE, M5602_XB_GPIO_DAT, 0x04},
        {BRIDGE, M5602_XB_GPIO_EN_H, 0x06},
        {BRIDGE, M5602_XB_GPIO_DIR_H, 0x06},
        {BRIDGE, M5602_XB_GPIO_DAT_H, 0x00},
        {BRIDGE, M5602_XB_GPIO_DAT, 0x00},
        {BRIDGE, M5602_XB_I2C_CLK_DIV, 0x0a},
        /* Reset chip */
        {SENSOR, OV9650_COM7, OV9650_REGISTER_RESET},
        /* Enable double clock */
        {SENSOR, OV9650_CLKRC, 0x80},
        /* Do something out of spec with the power */
        {SENSOR, OV9650_OFON, 0x40}
};

static const unsigned char init_ov9650[][3] = {
        /* [INITCAM] */
        {BRIDGE, M5602_XB_MCU_CLK_DIV, 0x02},
        {BRIDGE, M5602_XB_MCU_CLK_CTRL, 0xb0},
        {BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
        {BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
        {BRIDGE, M5602_XB_ADC_CTRL, 0xc0},
        {BRIDGE, M5602_XB_SENSOR_CTRL, 0x00},

        {BRIDGE, M5602_XB_SENSOR_TYPE, 0x08},
        {BRIDGE, M5602_XB_GPIO_DIR, 0x05},
        {BRIDGE, M5602_XB_GPIO_DAT, 0x04},
        {BRIDGE, M5602_XB_GPIO_EN_H, 0x06},
        {BRIDGE, M5602_XB_GPIO_DIR_H, 0x06},
        {BRIDGE, M5602_XB_GPIO_DAT_H, 0x00},
        {BRIDGE, M5602_XB_GPIO_DAT, 0x00},
        {BRIDGE, M5602_XB_I2C_CLK_DIV, 0x0a},

        /* Reset chip */
        {SENSOR, OV9650_COM7, OV9650_REGISTER_RESET},
        /* One extra reset is needed in order to make the sensor behave
           properly when resuming from ram, could be a timing issue */
        {SENSOR, OV9650_COM7, OV9650_REGISTER_RESET},

        /* Enable double clock */
        {SENSOR, OV9650_CLKRC, 0x80},
        /* Do something out of spec with the power */
        {SENSOR, OV9650_OFON, 0x40},

        /* Set fast AGC/AEC algorithm with unlimited step size */
        {SENSOR, OV9650_COM8, OV9650_FAST_AGC_AEC |
                              OV9650_AEC_UNLIM_STEP_SIZE},

        {SENSOR, OV9650_CHLF, 0x10},
        {SENSOR, OV9650_ARBLM, 0xbf},
        {SENSOR, OV9650_ACOM38, 0x81},
        /* Turn off color matrix coefficient double option */
        {SENSOR, OV9650_COM16, 0x00},
        /* Enable color matrix for RGB/YUV, Delay Y channel,
        set output Y/UV delay to 1 */
        {SENSOR, OV9650_COM13, 0x19},
        /* Enable digital BLC, Set output mode to U Y V Y */
        {SENSOR, OV9650_TSLB, 0x0c},
        /* Limit the AGC/AEC stable upper region */
        {SENSOR, OV9650_COM24, 0x00},
        /* Enable HREF and some out of spec things */
        {SENSOR, OV9650_COM12, 0x73},
        /* Set all DBLC offset signs to positive and
        do some out of spec stuff */
        {SENSOR, OV9650_DBLC1, 0xdf},
        {SENSOR, OV9650_COM21, 0x06},
        {SENSOR, OV9650_RSVD35, 0x91},
        /* Necessary, no camera stream without it */
        {SENSOR, OV9650_RSVD16, 0x06},
        {SENSOR, OV9650_RSVD94, 0x99},
        {SENSOR, OV9650_RSVD95, 0x99},
        {SENSOR, OV9650_RSVD96, 0x04},
        /* Enable full range output */
        {SENSOR, OV9650_COM15, 0x0},
        /* Enable HREF at optical black, enable ADBLC bias,
        enable ADBLC, reset timings at format change */
        {SENSOR, OV9650_COM6, 0x4b},
        /* Subtract 32 from the B channel bias */
        {SENSOR, OV9650_BBIAS, 0xa0},
        /* Subtract 32 from the Gb channel bias */
        {SENSOR, OV9650_GbBIAS, 0xa0},
        /* Do not bypass the analog BLC and to some out of spec stuff */
        {SENSOR, OV9650_Gr_COM, 0x00},
        /* Subtract 32 from the R channel bias */
        {SENSOR, OV9650_RBIAS, 0xa0},
        /* Subtract 32 from the R channel bias */
        {SENSOR, OV9650_RBIAS, 0x0},
        {SENSOR, OV9650_COM26, 0x80},
        {SENSOR, OV9650_ACOMA9, 0x98},
        /* Set the AGC/AEC stable region upper limit */
        {SENSOR, OV9650_AEW, 0x68},
        /* Set the AGC/AEC stable region lower limit */
        {SENSOR, OV9650_AEB, 0x5c},
        /* Set the high and low limit nibbles to 3 */
        {SENSOR, OV9650_VPT, 0xc3},
        /* Set the Automatic Gain Ceiling (AGC) to 128x,
        drop VSYNC at frame drop,
        limit exposure timing,
        drop frame when the AEC step is larger than the exposure gap */
        {SENSOR, OV9650_COM9, 0x6e},
        /* Set VSYNC negative, Set RESET to SLHS (slave mode horizontal sync)
        and set PWDN to SLVS (slave mode vertical sync) */
        {SENSOR, OV9650_COM10, 0x42},
        /* Set horizontal column start high to default value */
        {SENSOR, OV9650_HSTART, 0x1a}, /* 210 */
        /* Set horizontal column end */
        {SENSOR, OV9650_HSTOP, 0xbf}, /* 1534 */
        /* Complementing register to the two writes above */
        {SENSOR, OV9650_HREF, 0xb2},
        /* Set vertical row start high bits */
        {SENSOR, OV9650_VSTRT, 0x02},
        /* Set vertical row end low bits */
        {SENSOR, OV9650_VSTOP, 0x7e},
        /* Set complementing vertical frame control */
        {SENSOR, OV9650_VREF, 0x10},
        {SENSOR, OV9650_ADC, 0x04},
        {SENSOR, OV9650_HV, 0x40},

        /* Enable denoise, and white-pixel erase */
        {SENSOR, OV9650_COM22, OV9650_DENOISE_ENABLE |
                 OV9650_WHITE_PIXEL_ENABLE |
                 OV9650_WHITE_PIXEL_OPTION},

        /* Enable VARIOPIXEL */
        {SENSOR, OV9650_COM3, OV9650_VARIOPIXEL},
        {SENSOR, OV9650_COM4, OV9650_QVGA_VARIOPIXEL},

        /* Put the sensor in soft sleep mode */
        {SENSOR, OV9650_COM2, OV9650_SOFT_SLEEP | OV9650_OUTPUT_DRIVE_2X},
};

static const unsigned char res_init_ov9650[][3] = {
        {SENSOR, OV9650_COM2, OV9650_OUTPUT_DRIVE_2X},

        {BRIDGE, M5602_XB_LINE_OF_FRAME_H, 0x82},
        {BRIDGE, M5602_XB_LINE_OF_FRAME_L, 0x00},
        {BRIDGE, M5602_XB_PIX_OF_LINE_H, 0x82},
        {BRIDGE, M5602_XB_PIX_OF_LINE_L, 0x00},
        {BRIDGE, M5602_XB_SIG_INI, 0x01}
};

/* Vertically and horizontally flips the image if matched, needed for machines
   where the sensor is mounted upside down */
static
    const
        struct dmi_system_id ov9650_flip_dmi_table[] = {
        {
                .ident = "ASUS A6Ja",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "A6J")
                }
        },
        {
                .ident = "ASUS A6JC",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "A6JC")
                }
        },
        {
                .ident = "ASUS A6K",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "A6K")
                }
        },
        {
                .ident = "ASUS A6Kt",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "A6Kt")
                }
        },
        {
                .ident = "ASUS A6VA",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "A6VA")
                }
        },
        {

                .ident = "ASUS A6VC",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "A6VC")
                }
        },
        {
                .ident = "ASUS A6VM",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "A6VM")
                }
        },
        {
                .ident = "ASUS A7V",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
                        DMI_MATCH(DMI_PRODUCT_NAME, "A7V")
                }
        },
        {
                .ident = "Alienware Aurora m9700",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "alienware"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Aurora m9700")
                }
        },
        {}
};

static struct v4l2_pix_format ov9650_modes[] = {
        {
                176,
                144,
                V4L2_PIX_FMT_SBGGR8,
                V4L2_FIELD_NONE,
                .sizeimage =
                        176 * 144,
                .bytesperline = 176,
                .colorspace = V4L2_COLORSPACE_SRGB,
                .priv = 9
        }, {
                320,
                240,
                V4L2_PIX_FMT_SBGGR8,
                V4L2_FIELD_NONE,
                .sizeimage =
                        320 * 240,
                .bytesperline = 320,
                .colorspace = V4L2_COLORSPACE_SRGB,
                .priv = 8
        }, {
                352,
                288,
                V4L2_PIX_FMT_SBGGR8,
                V4L2_FIELD_NONE,
                .sizeimage =
                        352 * 288,
                .bytesperline = 352,
                .colorspace = V4L2_COLORSPACE_SRGB,
                .priv = 9
        }, {
                640,
                480,
                V4L2_PIX_FMT_SBGGR8,
                V4L2_FIELD_NONE,
                .sizeimage =
                        640 * 480,
                .bytesperline = 640,
                .colorspace = V4L2_COLORSPACE_SRGB,
                .priv = 9
        }
};

static const struct v4l2_ctrl_ops ov9650_ctrl_ops = {
        .s_ctrl = ov9650_s_ctrl,
};

int ov9650_probe(struct sd *sd)
{
        int err = 0;
        u8 prod_id = 0, ver_id = 0, i;
        struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;

        if (force_sensor) {
                if (force_sensor == OV9650_SENSOR) {
                        pr_info("Forcing an %s sensor\n", ov9650.name);
                        goto sensor_found;
                }
                /* If we want to force another sensor,
                   don't try to probe this one */
                return -ENODEV;
        }

        gspca_dbg(gspca_dev, D_PROBE, "Probing for an ov9650 sensor\n");

        /* Run the pre-init before probing the sensor */
        for (i = 0; i < ARRAY_SIZE(preinit_ov9650) && !err; i++) {
                u8 data = preinit_ov9650[i][2];
                if (preinit_ov9650[i][0] == SENSOR)
                        err = m5602_write_sensor(sd,
                                preinit_ov9650[i][1], &data, 1);
                else
                        err = m5602_write_bridge(sd,
                                preinit_ov9650[i][1], data);
        }

        if (err < 0)
                return err;

        if (m5602_read_sensor(sd, OV9650_PID, &prod_id, 1))
                return -ENODEV;

        if (m5602_read_sensor(sd, OV9650_VER, &ver_id, 1))
                return -ENODEV;

        if ((prod_id == 0x96) && (ver_id == 0x52)) {
                pr_info("Detected an ov9650 sensor\n");
                goto sensor_found;
        }
        return -ENODEV;

sensor_found:
        sd->gspca_dev.cam.cam_mode = ov9650_modes;
        sd->gspca_dev.cam.nmodes = ARRAY_SIZE(ov9650_modes);

        return 0;
}

int ov9650_init(struct sd *sd)
{
        int i, err = 0;
        u8 data;

        if (dump_sensor)
                ov9650_dump_registers(sd);

        for (i = 0; i < ARRAY_SIZE(init_ov9650) && !err; i++) {
                data = init_ov9650[i][2];
                if (init_ov9650[i][0] == SENSOR)
                        err = m5602_write_sensor(sd, init_ov9650[i][1],
                                                  &data, 1);
                else
                        err = m5602_write_bridge(sd, init_ov9650[i][1], data);
        }

        return 0;
}

int ov9650_init_controls(struct sd *sd)
{
        struct v4l2_ctrl_handler *hdl = &sd->gspca_dev.ctrl_handler;

        sd->gspca_dev.vdev.ctrl_handler = hdl;
        v4l2_ctrl_handler_init(hdl, 9);

        sd->auto_white_bal = v4l2_ctrl_new_std(hdl, &ov9650_ctrl_ops,
                                               V4L2_CID_AUTO_WHITE_BALANCE,
                                               0, 1, 1, 1);
        sd->red_bal = v4l2_ctrl_new_std(hdl, &ov9650_ctrl_ops,
                                        V4L2_CID_RED_BALANCE, 0, 255, 1,
                                        RED_GAIN_DEFAULT);
        sd->blue_bal = v4l2_ctrl_new_std(hdl, &ov9650_ctrl_ops,
                                        V4L2_CID_BLUE_BALANCE, 0, 255, 1,
                                        BLUE_GAIN_DEFAULT);

        sd->autoexpo = v4l2_ctrl_new_std_menu(hdl, &ov9650_ctrl_ops,
                          V4L2_CID_EXPOSURE_AUTO, 1, 0, V4L2_EXPOSURE_AUTO);
        sd->expo = v4l2_ctrl_new_std(hdl, &ov9650_ctrl_ops, V4L2_CID_EXPOSURE,
                          0, 0x1ff, 4, EXPOSURE_DEFAULT);

        sd->autogain = v4l2_ctrl_new_std(hdl, &ov9650_ctrl_ops,
                                         V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
        sd->gain = v4l2_ctrl_new_std(hdl, &ov9650_ctrl_ops, V4L2_CID_GAIN, 0,
                                     0x3ff, 1, GAIN_DEFAULT);

        sd->hflip = v4l2_ctrl_new_std(hdl, &ov9650_ctrl_ops, V4L2_CID_HFLIP,
                                      0, 1, 1, 0);
        sd->vflip = v4l2_ctrl_new_std(hdl, &ov9650_ctrl_ops, V4L2_CID_VFLIP,
                                      0, 1, 1, 0);

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

        v4l2_ctrl_auto_cluster(3, &sd->auto_white_bal, 0, false);
        v4l2_ctrl_auto_cluster(2, &sd->autoexpo, 0, false);
        v4l2_ctrl_auto_cluster(2, &sd->autogain, 0, false);
        v4l2_ctrl_cluster(2, &sd->hflip);

        return 0;
}

int ov9650_start(struct sd *sd)
{
        u8 data;
        int i, err = 0;
        struct cam *cam = &sd->gspca_dev.cam;

        int width = cam->cam_mode[sd->gspca_dev.curr_mode].width;
        int height = cam->cam_mode[sd->gspca_dev.curr_mode].height;
        int ver_offs = cam->cam_mode[sd->gspca_dev.curr_mode].priv;
        int hor_offs = OV9650_LEFT_OFFSET;
        struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;

        if ((!dmi_check_system(ov9650_flip_dmi_table) &&
                sd->vflip->val) ||
                (dmi_check_system(ov9650_flip_dmi_table) &&
                !sd->vflip->val))
                ver_offs--;

        if (width <= 320)
                hor_offs /= 2;

        /* Synthesize the vsync/hsync setup */
        for (i = 0; i < ARRAY_SIZE(res_init_ov9650) && !err; i++) {
                if (res_init_ov9650[i][0] == BRIDGE)
                        err = m5602_write_bridge(sd, res_init_ov9650[i][1],
                                res_init_ov9650[i][2]);
                else if (res_init_ov9650[i][0] == SENSOR) {
                        data = res_init_ov9650[i][2];
                        err = m5602_write_sensor(sd,
                                res_init_ov9650[i][1], &data, 1);
                }
        }
        if (err < 0)
                return err;

        err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA,
                                 ((ver_offs >> 8) & 0xff));
        if (err < 0)
                return err;

        err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (ver_offs & 0xff));
        if (err < 0)
                return err;

        err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, 0);
        if (err < 0)
                return err;

        err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (height >> 8) & 0xff);
        if (err < 0)
                return err;

        err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (height & 0xff));
        if (err < 0)
                return err;

        for (i = 0; i < 2 && !err; i++)
                err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, 0);
        if (err < 0)
                return err;

        err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 0);
        if (err < 0)
                return err;

        err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 2);
        if (err < 0)
                return err;

        err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA,
                                 (hor_offs >> 8) & 0xff);
        if (err < 0)
                return err;

        err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA, hor_offs & 0xff);
        if (err < 0)
                return err;

        err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA,
                                 ((width + hor_offs) >> 8) & 0xff);
        if (err < 0)
                return err;

        err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA,
                                 ((width + hor_offs) & 0xff));
        if (err < 0)
                return err;

        err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 0);
        if (err < 0)
                return err;

        switch (width) {
        case 640:
                gspca_dbg(gspca_dev, D_CONF, "Configuring camera for VGA mode\n");

                data = OV9650_VGA_SELECT | OV9650_RGB_SELECT |
                       OV9650_RAW_RGB_SELECT;
                err = m5602_write_sensor(sd, OV9650_COM7, &data, 1);
                break;

        case 352:
                gspca_dbg(gspca_dev, D_CONF, "Configuring camera for CIF mode\n");

                data = OV9650_CIF_SELECT | OV9650_RGB_SELECT |
                                OV9650_RAW_RGB_SELECT;
                err = m5602_write_sensor(sd, OV9650_COM7, &data, 1);
                break;

        case 320:
                gspca_dbg(gspca_dev, D_CONF, "Configuring camera for QVGA mode\n");

                data = OV9650_QVGA_SELECT | OV9650_RGB_SELECT |
                                OV9650_RAW_RGB_SELECT;
                err = m5602_write_sensor(sd, OV9650_COM7, &data, 1);
                break;

        case 176:
                gspca_dbg(gspca_dev, D_CONF, "Configuring camera for QCIF mode\n");

                data = OV9650_QCIF_SELECT | OV9650_RGB_SELECT |
                        OV9650_RAW_RGB_SELECT;
                err = m5602_write_sensor(sd, OV9650_COM7, &data, 1);
                break;
        }
        return err;
}

int ov9650_stop(struct sd *sd)
{
        u8 data = OV9650_SOFT_SLEEP | OV9650_OUTPUT_DRIVE_2X;
        return m5602_write_sensor(sd, OV9650_COM2, &data, 1);
}

void ov9650_disconnect(struct sd *sd)
{
        ov9650_stop(sd);

        sd->sensor = NULL;
}

static int ov9650_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
{
        struct sd *sd = (struct sd *) gspca_dev;
        u8 i2c_data;
        int err;

        gspca_dbg(gspca_dev, D_CONF, "Set exposure to %d\n", val);

        /* The 6 MSBs */
        i2c_data = (val >> 10) & 0x3f;
        err = m5602_write_sensor(sd, OV9650_AECHM,
                                  &i2c_data, 1);
        if (err < 0)
                return err;

        /* The 8 middle bits */
        i2c_data = (val >> 2) & 0xff;
        err = m5602_write_sensor(sd, OV9650_AECH,
                                  &i2c_data, 1);
        if (err < 0)
                return err;

        /* The 2 LSBs */
        i2c_data = val & 0x03;
        err = m5602_write_sensor(sd, OV9650_COM1, &i2c_data, 1);
        return err;
}

static int ov9650_set_gain(struct gspca_dev *gspca_dev, __s32 val)
{
        int err;
        u8 i2c_data;
        struct sd *sd = (struct sd *) gspca_dev;

        gspca_dbg(gspca_dev, D_CONF, "Setting gain to %d\n", val);

        /* The 2 MSB */
        /* Read the OV9650_VREF register first to avoid
           corrupting the VREF high and low bits */
        err = m5602_read_sensor(sd, OV9650_VREF, &i2c_data, 1);
        if (err < 0)
                return err;

        /* Mask away all uninteresting bits */
        i2c_data = ((val & 0x0300) >> 2) |
                        (i2c_data & 0x3f);
        err = m5602_write_sensor(sd, OV9650_VREF, &i2c_data, 1);
        if (err < 0)
                return err;

        /* The 8 LSBs */
        i2c_data = val & 0xff;
        err = m5602_write_sensor(sd, OV9650_GAIN, &i2c_data, 1);
        return err;
}

static int ov9650_set_red_balance(struct gspca_dev *gspca_dev, __s32 val)
{
        int err;
        u8 i2c_data;
        struct sd *sd = (struct sd *) gspca_dev;

        gspca_dbg(gspca_dev, D_CONF, "Set red gain to %d\n", val);

        i2c_data = val & 0xff;
        err = m5602_write_sensor(sd, OV9650_RED, &i2c_data, 1);
        return err;
}

static int ov9650_set_blue_balance(struct gspca_dev *gspca_dev, __s32 val)
{
        int err;
        u8 i2c_data;
        struct sd *sd = (struct sd *) gspca_dev;

        gspca_dbg(gspca_dev, D_CONF, "Set blue gain to %d\n", val);

        i2c_data = val & 0xff;
        err = m5602_write_sensor(sd, OV9650_BLUE, &i2c_data, 1);
        return err;
}

static int ov9650_set_hvflip(struct gspca_dev *gspca_dev)
{
        int err;
        u8 i2c_data;
        struct sd *sd = (struct sd *) gspca_dev;
        int hflip = sd->hflip->val;
        int vflip = sd->vflip->val;

        gspca_dbg(gspca_dev, D_CONF, "Set hvflip to %d %d\n", hflip, vflip);

        if (dmi_check_system(ov9650_flip_dmi_table))
                vflip = !vflip;

        i2c_data = (hflip << 5) | (vflip << 4);
        err = m5602_write_sensor(sd, OV9650_MVFP, &i2c_data, 1);
        if (err < 0)
                return err;

        /* When vflip is toggled we need to readjust the bridge hsync/vsync */
        if (gspca_dev->streaming)
                err = ov9650_start(sd);

        return err;
}

static int ov9650_set_auto_exposure(struct gspca_dev *gspca_dev,
                                    __s32 val)
{
        int err;
        u8 i2c_data;
        struct sd *sd = (struct sd *) gspca_dev;

        gspca_dbg(gspca_dev, D_CONF, "Set auto exposure control to %d\n", val);

        err = m5602_read_sensor(sd, OV9650_COM8, &i2c_data, 1);
        if (err < 0)
                return err;

        val = (val == V4L2_EXPOSURE_AUTO);
        i2c_data = ((i2c_data & 0xfe) | ((val & 0x01) << 0));

        return m5602_write_sensor(sd, OV9650_COM8, &i2c_data, 1);
}

static int ov9650_set_auto_white_balance(struct gspca_dev *gspca_dev,
                                         __s32 val)
{
        int err;
        u8 i2c_data;
        struct sd *sd = (struct sd *) gspca_dev;

        gspca_dbg(gspca_dev, D_CONF, "Set auto white balance to %d\n", val);

        err = m5602_read_sensor(sd, OV9650_COM8, &i2c_data, 1);
        if (err < 0)
                return err;

        i2c_data = ((i2c_data & 0xfd) | ((val & 0x01) << 1));
        err = m5602_write_sensor(sd, OV9650_COM8, &i2c_data, 1);

        return err;
}

static int ov9650_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val)
{
        int err;
        u8 i2c_data;
        struct sd *sd = (struct sd *) gspca_dev;

        gspca_dbg(gspca_dev, D_CONF, "Set auto gain control to %d\n", val);

        err = m5602_read_sensor(sd, OV9650_COM8, &i2c_data, 1);
        if (err < 0)
                return err;

        i2c_data = ((i2c_data & 0xfb) | ((val & 0x01) << 2));

        return m5602_write_sensor(sd, OV9650_COM8, &i2c_data, 1);
}

static int ov9650_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;
        int err;

        if (!gspca_dev->streaming)
                return 0;

        switch (ctrl->id) {
        case V4L2_CID_AUTO_WHITE_BALANCE:
                err = ov9650_set_auto_white_balance(gspca_dev, ctrl->val);
                if (err || ctrl->val)
                        return err;
                err = ov9650_set_red_balance(gspca_dev, sd->red_bal->val);
                if (err)
                        return err;
                err = ov9650_set_blue_balance(gspca_dev, sd->blue_bal->val);
                break;
        case V4L2_CID_EXPOSURE_AUTO:
                err = ov9650_set_auto_exposure(gspca_dev, ctrl->val);
                if (err || ctrl->val == V4L2_EXPOSURE_AUTO)
                        return err;
                err = ov9650_set_exposure(gspca_dev, sd->expo->val);
                break;
        case V4L2_CID_AUTOGAIN:
                err = ov9650_set_auto_gain(gspca_dev, ctrl->val);
                if (err || ctrl->val)
                        return err;
                err = ov9650_set_gain(gspca_dev, sd->gain->val);
                break;
        case V4L2_CID_HFLIP:
                err = ov9650_set_hvflip(gspca_dev);
                break;
        default:
                return -EINVAL;
        }

        return err;
}

static void ov9650_dump_registers(struct sd *sd)
{
        int address;
        pr_info("Dumping the ov9650 register state\n");
        for (address = 0; address < 0xa9; address++) {
                u8 value;
                m5602_read_sensor(sd, address, &value, 1);
                pr_info("register 0x%x contains 0x%x\n", address, value);
        }

        pr_info("ov9650 register state dump complete\n");

        pr_info("Probing for which registers that are read/write\n");
        for (address = 0; address < 0xff; address++) {
                u8 old_value, ctrl_value;
                u8 test_value[2] = {0xff, 0xff};

                m5602_read_sensor(sd, address, &old_value, 1);
                m5602_write_sensor(sd, address, test_value, 1);
                m5602_read_sensor(sd, address, &ctrl_value, 1);

                if (ctrl_value == test_value[0])
                        pr_info("register 0x%x is writeable\n", address);
                else
                        pr_info("register 0x%x is read only\n", address);

                /* Restore original value */
                m5602_write_sensor(sd, address, &old_value, 1);
        }
}