nixos-conf/modules/hardware/trackball.nix

{ config, lib, ... }:
let
  cfg = config.custom.hardware.trackball;
in
{
  options.custom.hardware.trackball.enable =
    lib.mkEnableOption "Logitech MX Ergo trackball hardware configuration";

  config = lib.mkIf cfg.enable {
    nixpkgs.overlays = [
      (final: prev: {
        moonlight-qt = prev.moonlight-qt.overrideAttrs (old: {
          patches = (old.patches or [ ]) ++ [ ./moonlight-trackball-accel.patch ];
        });
      })
    ];

    hardware.logitech.wireless = {
      enable = true;
      enableGraphical = true;
    };

    services.libinput.mouse = {
      accelProfile = "custom";
      accelStepMotion = 5.0e-2;
      accelPointsMotion = [
        0.0
        2.0e-2
        4.0e-2
        6.0e-2
        8.0e-2
        0.1
        0.12
        0.14
        0.16
        0.18
        0.2
        0.2525
        0.31
        0.3725
        0.44
        0.5125
        0.59
        0.6725
        0.76
        0.8525
        0.95
        1.155
        1.37
        1.595
        1.83
        2.075
        2.33
        2.595
        2.87
        3.155
        3.45
        3.755
        4.07
        4.395
        4.73
        5.075
        5.43
        5.795
        6.17
        6.555
        6.95
        7.355
        7.77
        8.195
        8.63
        9.075
        9.53
        9.995
        10.47
        10.955
        11.45
        11.95
      ];
    };
  };
}