Setup HUION L610 (Inspiroy Frego) under LinuX

setup Huion L610 (Frego) under Linux

Huion L610 (绘王 Inspiroy Frego) is a good tablet.

But for now (2024-12-24), its firmware has a bug (i think) that as default mode the upper button on pen is un-useable.

dump using evtest:

// tip touch
Event: time 1734945664.049126, type 4 (EV_MSC), code 4 (MSC_SCAN), value d0042
Event: time 1734945664.049126, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 1
Event: time 1734945664.141165, type 4 (EV_MSC), code 4 (MSC_SCAN), value d0042
Event: time 1734945664.141165, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 0

// upper button
Event: time 1734945679.961154, type 4 (EV_MSC), code 4 (MSC_SCAN), value d0043
Event: time 1734945679.961154, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 1
Event: time 1734945680.161244, type 4 (EV_MSC), code 4 (MSC_SCAN), value d0043
Event: time 1734945680.161244, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 0

// lower button
Event: time 1734945817.985139, type 4 (EV_MSC), code 4 (MSC_SCAN), value d0044
Event: time 1734945817.985139, type 1 (EV_KEY), code 331 (BTN_STYLUS), value 1
Event: time 1734945818.285692, type 4 (EV_MSC), code 4 (MSC_SCAN), value d0044
Event: time 1734945818.285692, type 1 (EV_KEY), code 331 (BTN_STYLUS), value 0

you can see upper button has same code (330) for tip touch. i' sorry...

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after some research, those solution seems fine.

1. just use hwdb
a) use udevadm info --query=all --name=/dev/input/eventX  // to check device path (usb or bt)
b) create a /etc/udev/hwdb.d/99-bt-l610-tablet.hwdb
  evdev:input:b0005v256Cp8251*
     KEYBOARD_KEY_d0042=330    # tip
     KEYBOARD_KEY_d0043=332    # -> upper
     KEYBOARD_KEY_d0044=331    # -> lower
c) sudo systemd-hwdb update; sudo  sudo udevadm trigger

than you can use upper button as MOUSE RIGHT_BTN (tip touch for LEFT_BTN, and lower for MID_BTN)

2. use uvdev code, for more flexible config, sample like:

    import evdev
    from evdev import UInput, ecodes

    ui = UInput()

    device = evdev.InputDevice('/dev/input/event28')

    for event in device.read_loop():
        if event.type == evdev.ecodes.EV_MSC and event.value == 0xd0043:
            ui.write(evdev.ecodes.EV_KEY, evdev.ecodes.KEY_E, 1)  
            ui.write(evdev.ecodes.EV_KEY, evdev.ecodes.KEY_E, 0)  
            ui.syn()
 

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doNOT use them both !


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then  xinput --map-to-output "Inspiroy Frego M-xxxxxx Pen (0)" yyyyy # to map tablet work screen.

that's all!

hope they can upgrade firmware to fix the bug..