default or selected kernelversion does not have config value CONFIG_SENSORS_FSCPOS.
Result is shown for kernelversion 5.3.7

FSC Poseidon

modulename: fscpos.ko

configname: CONFIG_SENSORS_FSCPOS

Linux Kernel Configuration
└─>Device Drivers
└─>Hardware Monitoring support
└─>I2C support
└─>FSC Poseidon
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
If you say yes here you get support for Fujitsu Siemens
Computers Poseidon sensor chips.

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

source code: