i had 2 game generic controller for Pc, and both of them were connected to this exact circuits and output was one USB. for my curiosity i disconnected this pcb circuit and removed the parts. but I'm stuck because i want to rebuild it for myself , but components are so odd . and there was something under the epoxy Wich i couldn't recover when removing the resin. so under the epoxy is a total mystery for me. can anyone help me please solve this problem, or does anybody know how gamepad pinout works? my gamepads have 8 pinout and i can't figure out how to make them into 4pin usb. 
