1 files changed, 124 insertions, 0 deletions
diff --git a/nixos/modules/services/hardware/tlp.nix b/nixos/modules/services/hardware/tlp.nix
new file mode 100644
index 00000000000..eb53f565a67
--- /dev/null
+++ b/nixos/modules/services/hardware/tlp.nix
@@ -0,0 +1,124 @@
+{ config, lib, pkgs, ... }:
+with lib;
+let
+  cfg = config.services.tlp;
+  enableRDW = config.networking.networkmanager.enable;
+  tlp = pkgs.tlp.override { inherit enableRDW; };
+  # TODO: Use this for having proper parameters in the future
+  mkTlpConfig = tlpConfig: generators.toKeyValue {
+    mkKeyValue = generators.mkKeyValueDefault {
+      mkValueString = val:
+        if isList val then "\"" + (toString val) + "\""
+        else toString val;
+    } "=";
+  } tlpConfig;
+in
+{
+  ###### interface
+  options = {
+    services.tlp = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Whether to enable the TLP power management daemon.";
+      };
+
+      settings = mkOption {type = with types; attrsOf (oneOf [bool int float str (listOf str)]);
+        default = {};
+        example = {
+          SATA_LINKPWR_ON_BAT = "med_power_with_dipm";
+          USB_BLACKLIST_PHONE = 1;
+        };
+        description = ''
+          Options passed to TLP. See https://linrunner.de/tlp for all supported options..
+        '';
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        description = ''
+          Verbatim additional configuration variables for TLP.
+          DEPRECATED: use services.tlp.settings instead.
+        '';
+      };
+    };
+  };
+
+  ###### implementation
+  config = mkIf cfg.enable {
+    boot.kernelModules = [ "msr" ];
+
+    warnings = optional (cfg.extraConfig != "") ''
+      Using config.services.tlp.extraConfig is deprecated and will become unsupported in a future release. Use config.services.tlp.settings instead.
+    '';
+
+    assertions = [{
+      assertion = cfg.enable -> config.powerManagement.scsiLinkPolicy == null;
+      message = ''
+        `services.tlp.enable` and `config.powerManagement.scsiLinkPolicy` cannot be set both.
+        Set `services.tlp.settings.SATA_LINKPWR_ON_AC` and `services.tlp.settings.SATA_LINKPWR_ON_BAT` instead.
+      '';
+    }];
+
+    environment.etc = {
+      "tlp.conf".text = (mkTlpConfig cfg.settings) + cfg.extraConfig;
+    } // optionalAttrs enableRDW {
+      "NetworkManager/dispatcher.d/99tlp-rdw-nm".source =
+        "${tlp}/etc/NetworkManager/dispatcher.d/99tlp-rdw-nm";
+    };
+
+    environment.systemPackages = [ tlp ];
+
+
+    services.tlp.settings = let
+      cfg = config.powerManagement;
+      maybeDefault = val: lib.mkIf (val != null) (lib.mkDefault val);
+    in {
+      CPU_SCALING_GOVERNOR_ON_AC = maybeDefault cfg.cpuFreqGovernor;
+      CPU_SCALING_GOVERNOR_ON_BAT = maybeDefault cfg.cpuFreqGovernor;
+      CPU_SCALING_MIN_FREQ_ON_AC = maybeDefault cfg.cpufreq.min;
+      CPU_SCALING_MAX_FREQ_ON_AC = maybeDefault cfg.cpufreq.max;
+      CPU_SCALING_MIN_FREQ_ON_BAT = maybeDefault cfg.cpufreq.min;
+      CPU_SCALING_MAX_FREQ_ON_BAT = maybeDefault cfg.cpufreq.max;
+    };
+
+    services.udev.packages = [ tlp ];
+
+    systemd = {
+      # use native tlp instead because it can also differentiate between AC/BAT
+      services.cpufreq.enable = false;
+
+      packages = [ tlp ];
+      # XXX: These must always be disabled/masked according to [1].
+      #
+      # [1]: https://github.com/linrunner/TLP/blob/a9ada09e0821f275ce5f93dc80a4d81a7ff62ae4/tlp-stat.in#L319
+      sockets.systemd-rfkill.enable = false;
+      services.systemd-rfkill.enable = false;
+
+      services.tlp = {
+        # XXX: The service should reload whenever the configuration changes,
+        # otherwise newly set power options remain inactive until reboot (or
+        # manual unit restart.)
+        restartTriggers = [ config.environment.etc."tlp.conf".source ];
+        # XXX: When using systemd.packages (which we do above) the [Install]
+        # section of systemd units does not work (citation needed) so we manually
+        # enforce it here.
+        wantedBy = [ "multi-user.target" ];
+      };
+
+      services.tlp-sleep = {
+        # XXX: When using systemd.packages (which we do above) the [Install]
+        # section of systemd units does not work (citation needed) so we manually
+        # enforce it here.
+        before = [ "sleep.target" ];
+        wantedBy = [ "sleep.target" ];
+        # XXX: `tlp suspend` requires /var/lib/tlp to exist in order to save
+        # some stuff in there. There is no way, that I know of, to do this in
+        # the package itself, so we do it here instead making sure the unit
+        # won't fail due to the save dir not existing.
+        serviceConfig.StateDirectory = "tlp";
+      };
+    };
+  };
+}