sca3300_read_reg
ret = sca3300_read_reg(sca_data, SCA3300_REG_MODE, ®_val);
ret = sca3300_read_reg(data, chan->address, val);
ret = sca3300_read_reg(data, indio_dev->channels[bit].address, &val);
ret = sca3300_read_reg(sca_data, SCA3300_REG_WHOAMI, &value);
ret = sca3300_read_reg(data, reg, &value);