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/BAT0/charge_control_end_threshold
'';
cfg = config.hardware.asus;
in
{
options.hardware.asus.battery.chargeUpto = lib.mkOption {
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description = "Maximum level of charge for your battery, as a percentage.";
default = 100;
type = lib.types.int;
};
config = {
environment.systemPackages = [ p ];
systemd.tmpfiles.rules = [
"w /sys/class/power_supply/BAT0/charge_control_end_threshold - - - - ${toString cfg.battery.chargeUpto}"
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];
};
}