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static int cxd2820r_tuner_i2c_xfer(struct i2c_adapter *i2c_adap,
        struct i2c_msg msg[], int num)
{
        struct cxd2820r_priv *priv = i2c_get_adapdata(i2c_adap);
        u8 obuf[msg[0].len + 2];
        struct i2c_msg msg2[2] = {
                {
                        .addr = priv->cfg.i2c_address,
                        .flags = 0,
                        .len = sizeof(obuf),
                        .buf = obuf,
                }, {
                        .addr = priv->cfg.i2c_address,
                        .flags = I2C_M_RD,
                }
        };

int tda18271_write_regs(struct dvb_frontend *fe, int idx, int len)
{
        struct tda18271_priv *priv = fe->tuner_priv;
        unsigned char *regs = priv->tda18271_regs;
        unsigned char buf[TDA18271_NUM_REGS + 1];
        struct i2c_msg msg = { .addr = priv->i2c_props.addr, .flags = 0,
                               .buf = buf };
        int i, ret = 1, max;

        BUG_ON((len == 0) || (idx + len > sizeof(buf)));


        switch (priv->small_i2c) {
        case TDA18271_03_BYTE_CHUNK_INIT:
                max = 3;
                break;
        case TDA18271_08_BYTE_CHUNK_INIT:
                max = 8;
                break;
        case TDA18271_16_BYTE_CHUNK_INIT:
                max = 16;
                break;
        case TDA18271_39_BYTE_CHUNK_INIT:
        default:
                max = 39;
        }

        tda18271_i2c_gate_ctrl(fe, 1);
        while (len) {
                if (max > len)
                        max = len;

                buf[0] = idx;
                for (i = 1; i <= max; i++)
                        buf[i] = regs[idx - 1 + i];

                msg.len = max + 1;

                /* write registers */
                ret = i2c_transfer(priv->i2c_props.adap, &msg, 1);