66 lines
1.7 KiB
Nix
66 lines
1.7 KiB
Nix
# ThinkPad charge limits.
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{
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config,
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lib,
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pkgs,
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...
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}:
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let
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cfg = config.module.powerlimit.thinkpad;
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controlFileMax = "/sys/class/power_supply/BAT0/charge_control_end_threshold";
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controlFileMin = "/sys/class/power_supply/BAT0/charge_control_start_threshold";
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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 ${toString cfg.offMax} > ${controlFileMax}
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echo ${toString cfg.offMin} > ${controlFileMin}
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else
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echo ${toString cfg.onMin} > ${controlFileMin}
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echo ${toString cfg.onMax} > ${controlFileMax}
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fi
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pkill -RTMIN+6 waybar
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true
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}
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function widget() {
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status && printf '' || printf ''
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}
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function status() {
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local current=$(cat ${controlFileMax})
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local enabled="${toString cfg.onMax}"
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[[ "''${current}" = "''${enabled}" ]]
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}
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''${@}
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'';
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in
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{
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config = lib.mkIf cfg.enable {
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environment.systemPackages = [ script ];
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systemd = {
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services.powerlimit = {
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enable = true;
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description = "Limit battery charge";
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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Type = "simple";
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RemainAfterExit = "yes";
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ExecStart = "${lib.getExe pkgs.bash} -c 'echo ${toString cfg.onMin} > ${controlFileMin}; echo ${toString cfg.onMax} > ${controlFileMax};'";
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ExecStop = "${lib.getExe pkgs.bash} -c 'echo ${toString cfg.offMax} > ${controlFileMax}; echo ${toString cfg.offMin} > ${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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};
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}
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