This project is being posted as completed. Both i2c chips have linux kernel drivers, so if your intent is to use this with a linux SBC, it should fit right in.

For microcontroller use, there is a driver in Manuvr for each individual part:
LTC2942-1
BQ24155

...as well as a compound of these two drivers to reflect their specific and combined usage in this board.

The Manuvr drivers will likely shift around, but they are basically working and would be a reasonable starting point for your own code.