Playstation 2 like controller - how to use it with Unity?

Hi, I´ve been looking all over the place for some help about how to setup a playstation 2 like gamepad. It´s got the 2 analog axis plus the regular directional pad. Also there are the L1, L2, R1, R2 buttons, and there´s this "auto" and "turbo" buttons. Aditionally the 4 (square, circle, triangle..etc..) buttons.

My question is: Can anyone help me to implement this into the first person controller prefab script, please?

How can I modify the prefs so that the .exe could read this controller? And if so, how could I script the game so that allows the player to either play with keyboard if Joypad is not present, or play solely with joypad?

Thanks.