80 lines
1.9 KiB
Nix
80 lines
1.9 KiB
Nix
# ThinkPad charge limits.
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{ pkgs, lib, config, ... } @args: with lib; let
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cfg = config.module.powerlimit.thinkpad;
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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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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} > ${controlFileMax}
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fi
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true
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}
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function waybar() {
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status || echo -n ""
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}
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function status() {
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local current=$(cat ${controlFileMax})
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local enabled="${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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options = {
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module.powerlimit.thinkpad = {
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enable = mkEnableOption "Powerlimit Service";
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onMin = mkOption {
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default = 40;
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type = types.int;
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};
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onMax = mkOption {
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default = 80;
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type = types.int;
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};
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offMin = mkOption {
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default = 90;
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type = types.int;
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};
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offMax = mkOption {
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default = 95;
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type = types.int;
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};
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};
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};
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config = 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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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 = "${getExe pkgs.bash} -c 'echo ${toString cfg.onMin} > ${controlFileMin}; echo ${toString cfg.onMax} > ${controlFileMax};'";
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ExecStop = "${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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