55 lines
1.5 KiB
Nix
Executable File
55 lines
1.5 KiB
Nix
Executable File
# echo 81 | sudo tee /sys/class/power_supply/macsmc-battery/charge_control_end_threshold
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{
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config,
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pkgs,
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lib,
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namespace,
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...
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}:
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with lib;
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let
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inherit (lib.${namespace}) mkOpt;
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cfg = config.${namespace}.hardware.battery;
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in
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{
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options.${namespace}.hardware.battery = {
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enable = mkEnableOption "battery charge limit service";
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chargeLimit = mkOpt types.int 81 "Charge limit for the battery, ex: 81 = 80% charge limit";
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battery = mkOpt types.str "" "Path to the battery charge limit file";
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};
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config = mkIf cfg.enable {
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assertions = [
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{
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assertion = cfg.battery != "";
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message = "mjallen.hardware.battery.battery must be set to the sysfs path of the battery charge limit file (e.g. \"/sys/class/power_supply/BAT0/charge_control_end_threshold\").";
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}
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{
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assertion = cfg.chargeLimit > 0 && cfg.chargeLimit <= 100;
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message = "mjallen.hardware.battery.chargeLimit must be between 1 and 100 (got ${toString cfg.chargeLimit}).";
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}
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];
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systemd = {
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services = {
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set-charge-limit = {
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enable = true;
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wantedBy = [ "multi-user.target" ];
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path = [
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pkgs.uutils-coreutils-noprefix
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];
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script = ''
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${pkgs.uutils-coreutils-noprefix}/bin/echo ${toString cfg.chargeLimit} | tee ${cfg.battery}
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'';
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serviceConfig = {
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Type = "oneshot";
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TimeoutSec = "5s";
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};
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};
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};
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};
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};
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}
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