res/raw/google_gamepad_register.json

{
    "id": 1,
    "type": "uinput",
    "command": "register",
    "name": "Test Gamepad (USB)",
    "vid": 0x18d1,
    "pid": 0xabcd,
    "bus": "usb",
    "configuration":[
        {"type": 100, "data": [1]},  // UI_SET_EVBIT : EV_KEY
        {"type": 101, "data": [304]}   // UI_SET_KEYBIT : KEY_GAMEPAD
    ]
}