TSL2591_CMD_NOP
TSL2591_CMD_NOP | TSL2591_DEVICE_ID);
ret = i2c_smbus_read_byte_data(client, TSL2591_CMD_NOP | TSL2591_STATUS);
TSL2591_CMD_NOP | TSL2591_C0_DATAL,
TSL2591_CMD_NOP | TSL2591_CONTROL,
TSL2591_CMD_NOP | TSL2591_AILTL,
TSL2591_CMD_NOP | TSL2591_AILTH,
TSL2591_CMD_NOP | TSL2591_AIHTL,
TSL2591_CMD_NOP | TSL2591_AIHTH,
TSL2591_CMD_NOP | TSL2591_PERSIST,
TSL2591_CMD_NOP | TSL2591_ENABLE,
TSL2591_CMD_NOP | TSL2591_PERSIST);