Useful links - st-sw/STC3115GenericDriver GitHub Wiki
Here are some links which provide more information on the fuel gauge device.
The latest version of the STC3115 open source driver is available on the open source website GitHub:
It has an updated file organization compare to the one on st.com
https://github.com/st-sw/STC3115GenericDriver/tree/master/src
Here is a simple init example of the fuel gauge:
https://github.com/st-sw/STC3115GenericDriver/blob/master/Examples/InitExamples/STC3115_init_sequence_example_(pseudo-code).txt
Some details on the OCV curve values:
https://github.com/st-sw/STC3115GenericDriver/tree/master/Docs/Config