106 lines
2.4 KiB
Nix
106 lines
2.4 KiB
Nix
{pkgs, config, ...}:
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###### interface
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let
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inherit (pkgs.lib) mkOption mkIf;
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options = {
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powerManagement = {
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enable = mkOption {
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default = false;
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description = "Whether to enable power management (ACPI daemon)";
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};
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};
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};
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in
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###### implementation
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let
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acpiConfDir = pkgs.runCommand "acpi-events" {}
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''
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ensureDir $out
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${
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# Generate a .conf file for each event. (You can't have
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# multiple events in one config file...)
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let f = event:
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''
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fn=$out/${event.name}.conf
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echo "event=${event.event}" > $fn
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echo "action=${pkgs.writeScript "${event.name}.sh" event.action}" >> $fn
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'';
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in pkgs.lib.concatMapStrings f events
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}
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'';
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# Called when the power button is pressed.
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powerEvent =
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{ name = "power-button";
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event = "button/power.*";
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action =
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''
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#! ${pkgs.bash}/bin/sh
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'';
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};
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# Called when the laptop lid is opened/closed.
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lidEvent =
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{ name = "lid";
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event = "button/lid.*";
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action =
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''
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#! ${pkgs.bash}/bin/sh
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# Suspend to RAM if the lid is closed. (We also get this event
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# when the lid just opened, in which case we obviously don't
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# want to suspend again.)
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if grep -q closed /proc/acpi/button/lid/LID/state; then
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sync
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echo mem > /sys/power/state
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fi
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'';
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};
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# Called when the AC power is connected or disconnected.
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acEvent =
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{ name = "ac-power";
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event = "ac_adapter.*";
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action =
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''
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#! ${pkgs.bash}/bin/sh
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if grep -q "state:.*on-line" /proc/acpi/ac_adapter/AC/state; then
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echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
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elif grep -q "state:.*off-line" /proc/acpi/ac_adapter/AC/state; then
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echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
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fi
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'';
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};
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events = [powerEvent lidEvent acEvent];
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in
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mkIf config.powerManagement.enable {
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require = [
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options
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];
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services = {
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extraJobs = [{
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name = "acpid";
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job = ''
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description "ACPI daemon"
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start on udev
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stop on shutdown
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respawn ${pkgs.acpid}/sbin/acpid --foreground --confdir ${acpiConfDir}
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'';
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}];
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};
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}
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