nixpkgs/upstart-jobs/acpid.nix

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