ov5640_read_reg
ret = ov5640_read_reg(sensor, reg, &hi);
ret = ov5640_read_reg(sensor, reg + 1, &lo);
ret = ov5640_read_reg(sensor, reg, &readval);
ret = ov5640_read_reg(sensor, OV5640_REG_AEC_PK_EXPOSURE_HI, &temp);
ret = ov5640_read_reg(sensor, OV5640_REG_AEC_PK_EXPOSURE_MED, &temp);
ret = ov5640_read_reg(sensor, OV5640_REG_AEC_PK_EXPOSURE_LO, &temp);
ret = ov5640_read_reg(sensor, OV5640_REG_SC_PLL_CTRL0, &temp1);
ret = ov5640_read_reg(sensor, OV5640_REG_SC_PLL_CTRL1, &temp1);
ret = ov5640_read_reg(sensor, OV5640_REG_SC_PLL_CTRL2, &temp1);
ret = ov5640_read_reg(sensor, OV5640_REG_SC_PLL_CTRL3, &temp1);
ret = ov5640_read_reg(sensor, OV5640_REG_SYS_ROOT_DIVIDER, &temp1);
ret = ov5640_read_reg(sensor, OV5640_REG_AEC_CTRL00, &mode);
ret = ov5640_read_reg(sensor, OV5640_REG_HZ5060_CTRL01, &temp);
ret = ov5640_read_reg(sensor, OV5640_REG_HZ5060_CTRL00,
ret = ov5640_read_reg(sensor, OV5640_REG_SIGMADELTA_CTRL0C,
ret = ov5640_read_reg(sensor, OV5640_REG_TIMING_TC_REG21, &temp);
ret = ov5640_read_reg(sensor, OV5640_REG_DEBUG_MODE, &temp);
ret = ov5640_read_reg(sensor, OV5640_REG_AVG_READOUT, &average);