I2C drivers for Snapdragon 820

Hi all, I am new to Linux kernel. I have developed basic drivers on micro-controllers and now i want to dive deep into the Linux world. I have a snapdragon 820 development board running Android 7.1.1, Kernel version 3.18.31. I have a RF card which i need to interface with Snapdragon 820 development board over I2C. Can someone guide how to go about it??? Can someone share a document which explains the I2C driver implementation on Linux. Any help would be appreciated............!!!!!! Thanks, Shahid