isl_read_byte
if (isl_read_byte(sc->dev, REG_CMD2, &rbyte) != 0) {
if (isl_read_byte(dev, REG_CMD1, &rbyte) != 0) {
if (isl_read_byte(dev, REG_DATA1, &rbyte) != 0) {
if (isl_read_byte(dev, REG_DATA2, &rbyte) != 0) {