Texas Instruments TMP421 and compatible

modulename: tmp421.ko

configname: CONFIG_SENSORS_TMP421

Linux Kernel Configuration
└─>Device Drivers
└─>Hardware Monitoring support
└─>Texas Instruments TMP421 and compatible
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
If you say yes here you get support for Texas Instruments TMP421,
TMP422, TMP423, TMP441, and TMP442 temperature sensor chips.

This driver can also be built as a module. If so, the module
will be called tmp421.

source code: