qmk_firmware/keyboards/xiudi/xd004/info.json

{
    "keyboard_name": "XD004", 
    "manufacturer": "XIUDI",
    "maintainer": "qmk", 
    "usb": {
        "vid": "0x7844",
        "pid": "0x0404",
        "device_version": "0.0.1"
    },
    "backlight": {
        "pin": "D5",
        "levels": 6
    },
    "processor": "atmega16u2",
    "bootloader": "atmel-dfu",
    "matrix_pins": {
        "direct": [
            ["D3", "D0", "C4", "B4"]
        ]
    },
    "layouts": {
        "LAYOUT_all": {
            "layout": [
                {"x":0, "y":0, "matrix": [0, 0]},
                {"x":1, "y":0, "matrix": [0, 1]},
                {"x":2, "y":0, "matrix": [0, 2]},
                {"x":3, "y":0, "matrix": [0, 3]}
            ]
        }
    }
}