60 lines
1.4 KiB
Nix
60 lines
1.4 KiB
Nix
{ pkgs, lib, ... }: let
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controlFileMin = "/sys/class/power_supply/BAT0/charge_control_start_threshold";
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controlFileMax = "/sys/class/power_supply/BAT0/charge_control_end_threshold";
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onMin = "40";
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onMax = "80";
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offMin = "90";
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offMax = "95";
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script = pkgs.writeShellScriptBin "powerlimit" ''
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function _toggle() {
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if _status; then
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echo ${offMax} > ${controlFileMax}
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echo ${offMin} > ${controlFileMin}
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else
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echo ${onMin} > ${controlFileMin}
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echo ${onMax} > ${controlFileMax}
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fi
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true
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}
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function _waybar() {
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_status || echo -n ""
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}
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function _status() {
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local current=$(cat ${controlFileMax})
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local enabled="${onMax}"
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[[ "''${current}" = "''${enabled}" ]]
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}
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_''${1}
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'';
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in {
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systemd = {
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services.powerlimit = {
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description = "Limit battery charge.";
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enable = true;
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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Type = "simple";
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RemainAfterExit = "yes";
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ExecStart = "${lib.getExe pkgs.bash} -c 'echo 40 > ${controlFileMin}; echo 80 > ${controlFileMax};'";
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ExecStop = "${lib.getExe pkgs.bash} -c 'echo 95 > ${controlFileMax}; echo 90 > ${controlFileMin};'";
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};
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};
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# HACK: Allow user access.
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tmpfiles.rules = [
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"z ${controlFileMax} 0777 - - - -"
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"z ${controlFileMin} 0777 - - - -"
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];
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};
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systemd.services.keyd.path = [ script ];
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environment.systemPackages = [ script ];
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}
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