1 files changed, 80 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/services/hardware/auto-epp.nix b/nixpkgs/nixos/modules/services/hardware/auto-epp.nix
new file mode 100644
index 000000000000..84b6a337d28a
--- /dev/null
+++ b/nixpkgs/nixos/modules/services/hardware/auto-epp.nix
@@ -0,0 +1,80 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.services.auto-epp;
+  format = pkgs.formats.ini {};
+
+  inherit (lib) mkOption types;
+in {
+  options = {
+    services.auto-epp = {
+      enable = lib.mkEnableOption (lib.mdDoc "auto-epp for amd active pstate");
+
+      package = lib.mkPackageOptionMD pkgs "auto-epp" {};
+
+      settings = mkOption {
+        type = types.submodule {
+          freeformType = format.type;
+          options = {
+            Settings = {
+              epp_state_for_AC = mkOption {
+                type = types.str;
+                default = "balance_performance";
+                description = lib.mdDoc ''
+                  energy_performance_preference when on plugged in
+
+                  ::: {.note}
+                  See available epp states by running:
+                  {command}`cat /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_available_preferences`
+                  :::
+                '';
+              };
+
+              epp_state_for_BAT = mkOption {
+                type = types.str;
+                default = "power";
+                description = lib.mdDoc ''
+                  `energy_performance_preference` when on battery
+
+                  ::: {.note}
+                  See available epp states by running:
+                  {command}`cat /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_available_preferences`
+                  :::
+                '';
+              };
+            };
+          };
+        };
+        default = {};
+        description = lib.mdDoc ''
+          Settings for the auto-epp application.
+          See upstream example: <https://github.com/jothi-prasath/auto-epp/blob/master/sample-auto-epp.conf>
+        '';
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+
+    boot.kernelParams = [
+      "amd_pstate=active"
+    ];
+
+    environment.etc."auto-epp.conf".source = format.generate "auto-epp.conf" cfg.settings;
+    systemd.packages = [ cfg.package ];
+
+    systemd.services.auto-epp = {
+      after = [ "multi-user.target" ];
+      wantedBy  = [ "multi-user.target" ];
+      description = "auto-epp - Automatic EPP Changer for amd-pstate-epp";
+      serviceConfig = {
+        Type = "simple";
+        User = "root";
+        ExecStart = lib.getExe cfg.package;
+        Restart = "on-failure";
+      };
+    };
+  };
+
+  meta.maintainers = with lib.maintainers; [ lamarios ];
+}