ISL1208_REG_INT
int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr);
icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);