nixos-hardware/asus/battery.nix

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{ config, pkgs, lib, ... }:
let
p = pkgs.writeScriptBin "charge-upto" ''
echo ''${0:-100} > /sys/class/power_supply/BAT?/charge_control_end_threshold
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'';
cfg = config.hardware.asus.battery;
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in
{
options.hardware.asus.battery = {
chargeUpto = lib.mkOption {
description = "Maximum level of charge for your battery, as a percentage.";
default = 100;
type = lib.types.int;
};
enableChargeUptoScript = lib.mkOption {
description = "Whether to add charge-upto to environment.systemPackages. `charge-upto 75` temporarily sets the charge limit to 75%.";
default = true;
type = lib.types.bool;
};
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};
config = {
environment.systemPackages = lib.mkIf cfg.enableChargeUptoScript [ p ];
systemd.services.battery-charge-threshold = {
wantedBy = [ "local-fs.target" "suspend.target" ];
after = [ "local-fs.target" "suspend.target" ];
description = "Set the battery charge threshold to ${toString cfg.chargeUpto}%";
startLimitBurst = 5;
startLimitIntervalSec = 1;
serviceConfig = {
Type = "oneshot";
Restart = "on-failure";
ExecStart = "${pkgs.runtimeShell} -c 'echo ${toString cfg.chargeUpto} > /sys/class/power_supply/BAT?/charge_control_end_threshold'";
};
};
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};
}