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{ config, lib, ... }:
with lib;
{
###### interface
options = {
hardware.trackpoint = {
enable = mkOption {
default = false;
type = types.bool;
description = ''
Enable sensitivity and speed configuration for trackpoints.
'';
};
sensitivity = mkOption {
default = 128;
example = 255;
type = types.int;
description = ''
Configure the trackpoint sensitivity. By default, the kernel
configures 128.
'';
};
speed = mkOption {
default = 97;
example = 255;
type = types.int;
description = ''
Configure the trackpoint speed. By default, the kernel
configures 97.
'';
};
emulateWheel = mkOption {
default = false;
type = types.bool;
description = ''
Enable scrolling while holding the middle mouse button.
'';
};
fakeButtons = mkOption {
default = false;
type = types.bool;
description = ''
Switch to "bare" PS/2 mouse support in case Trackpoint buttons are not recognized
properly. This can happen for example on models like the L430, T450, T450s, on
which the Trackpoint buttons are actually a part of the Synaptics touchpad.
'';
};
device = mkOption {
default = "TPPS/2 IBM TrackPoint";
type = types.str;
description = ''
The device name of the trackpoint. You can check with xinput.
Some newer devices (example x1c6) use "TPPS/2 Elan TrackPoint".
'';
};
};
};
###### implementation
config =
let cfg = config.hardware.trackpoint; in
mkMerge [
(mkIf cfg.enable {
services.udev.extraRules =
''
ACTION=="add|change", SUBSYSTEM=="input", ATTR{name}=="${cfg.device}", ATTR{device/speed}="${toString cfg.speed}", ATTR{device/sensitivity}="${toString cfg.sensitivity}"
'';
system.activationScripts.trackpoint =
''
${config.systemd.package}/bin/udevadm trigger --attr-match=name="${cfg.device}"
'';
})
(mkIf (cfg.emulateWheel) {
services.xserver.inputClassSections = [
''
Identifier "Trackpoint Wheel Emulation"
MatchProduct "${if cfg.fakeButtons then "PS/2 Generic Mouse" else "ETPS/2 Elantech TrackPoint|Elantech PS/2 TrackPoint|TPPS/2 IBM TrackPoint|DualPoint Stick|Synaptics Inc. Composite TouchPad / TrackPoint|ThinkPad USB Keyboard with TrackPoint|USB Trackpoint pointing device|Composite TouchPad / TrackPoint|${cfg.device}"}"
MatchDevicePath "/dev/input/event*"
Option "EmulateWheel" "true"
Option "EmulateWheelButton" "2"
Option "Emulate3Buttons" "false"
Option "XAxisMapping" "6 7"
Option "YAxisMapping" "4 5"
''
];
})
(mkIf cfg.fakeButtons {
boot.extraModprobeConfig = "options psmouse proto=bare";
})
];
}
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