Rotatory encoders

For getting the position of my rotatory encoders path given on a github library( is :

but in my beaglebone there is no such path and i can rahter access this file using this path
in this directory there is no file named "position"
So plz suggest me how get the position
the files and directory i m getting in this path is 
driver_override   modalias   of_node   power   subsystem   uevent