Legion Go: DS4 Options/Share mapping fix

[nirys91]

Hi,

I’m not very experienced with GitHub or programming, so I hope this report is still useful. ChatGPT helped me inspect and understand the code, but I tested the behavior and the fix myself on my Lenovo Legion Go.

My use case was very specific:
I wanted compatctl to make the Legion Go controller behave like a DualShock 4 mainly so that games could show PlayStation button prompts correctly.

The issue I found was with the DS4 menu/special button mapping on Legion Go.

compatctl_fix(.exe).zip

What I experienced:

• the physical Select/View-side button was effectively behaving like DS4 Options
• with --enable-share-button, the Start/Menu-side button was being used for Share
• because of this, the PlayStation-style button behavior felt wrong in games
• in my case, I noticed it while trying to get proper PlayStation prompts in games like Mina the Hollower

What I did:

• downloaded the source code
• built it with cargo build --release
• inspected src/main.rs
• changed the button mapping
• rebuilt and tested the new executable on Legion Go

The mapping that worked correctly for me was:

• physical Start/Menu -> DS4 Options
• physical Select/View -> DS4 Share
• touchpad click disabled for now, to avoid overlap/conflicts

This is the code that worked for me in src/main.rs:

let buttons = DS4Buttons::new()
    .triangle(xstate.north_button())
    .cross(xstate.south_button())
    .circle(xstate.east_button())
    .square(xstate.west_button())
    .dpad(map_dpad_directions(xstate.arrow_up(), xstate.arrow_down(), xstate.arrow_left(), xstate.arrow_right()))
    .options(xstate.start_button())
    .shoulder_left(xstate.left_shoulder())
    .shoulder_right(xstate.right_shoulder())
    .thumb_left(xstate.left_thumb_button())
    .thumb_right(xstate.right_thumb_button())
    .trigger_left(xstate.left_trigger_bool())
    .trigger_right(xstate.right_trigger_bool());

let buttons = if *ENABLE_DS4_SHARE_BUTTON.get().unwrap_or(&false) {
    buttons.share(xstate.select_button())
} else {
    buttons
};

let special_buttons = DS4SpecialButtons::new()
    .touchpad(false)
    .ps_home(xstate.guide_button());

Before this change, the logic around Options / Share / touchpad did not feel correct on Legion Go.

After rebuilding, the modified version worked correctly for my use case.

I am not claiming this is necessarily the perfect universal solution for every game or setup, but I wanted to share it because it may help improve Legion Go support or help other users with the same goal.

Thanks for the project.

If useful, I can also provide the already compiled executable I tested on my Legion Go.