add thinkfan service

modules/module-list.nix

@@ -83,6 +83,7 @@
   ./services/hardware/udev.nix
   ./services/hardware/udisks.nix
   ./services/hardware/upower.nix
+  ./services/hardware/thinkfan.nix
   ./services/logging/klogd.nix
   ./services/logging/logcheck.nix
   ./services/logging/logrotate.nix

modules/services/hardware/thinkfan.nix

@@ -0,0 +1,88 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  cfg = config.services.thinkfan;
+  configFile = pkgs.writeText "thinkfan.conf" ''
+    # ATTENTION: There is only very basic sanity checking on the configuration.
+    # That means you can set your temperature limits as insane as you like. You
+    # can do anything stupid, e.g. turn off your fan when your CPU reaches 70°C.
+    #
+    # That's why this program is called THINKfan: You gotta think for yourself.
+    #
+    ######################################################################
+    #
+    # IBM/Lenovo Thinkpads (thinkpad_acpi, /proc/acpi/ibm)
+    # ====================================================
+    #
+    # IMPORTANT:
+    #
+    # To keep your HD from overheating, you have to specify a correction value for
+    # the sensor that has the HD's temperature. You need to do this because
+    # thinkfan uses only the highest temperature it can find in the system, and
+    # that'll most likely never be your HD, as most HDs are already out of spec
+    # when they reach 55 °C.
+    # Correction values are applied from left to right in the same order as the
+    # temperatures are read from the file.
+    #
+    # For example:
+    # sensor /proc/acpi/ibm/thermal (0, 0, 10)
+    # will add a fixed value of 10 °C the 3rd value read from that file. Check out
+    # http://www.thinkwiki.org/wiki/Thermal_Sensors to find out how much you may
+    # want to add to certain temperatures.
+    
+    #  Syntax:
+    #  (LEVEL, LOW, HIGH)
+    #  LEVEL is the fan level to use (0-7 with thinkpad_acpi)
+    #  LOW is the temperature at which to step down to the previous level
+    #  HIGH is the temperature at which to step up to the next level
+    #  All numbers are integers.
+    #
+
+    sensor /proc/acpi/ibm/thermal (0, 10, 15, 2, 10, 5, 0, 3, 0, 3)
+    
+    (0,     0,      55)
+    (1,     48,     60)
+    (2,     50,     61)
+    (3,     52,     63)
+    (6,     56,     65)
+    (7,     60,     85)
+    (127,   80,     32767)
+  '';
+
+in {
+
+  options = {
+
+    services.thinkfan = {
+
+      enable = mkOption {
+        default = false;
+        description = ''
+          Whether to enable thinkfan, fan controller for ibm/lenovo thinkpads.
+        '';
+      };
+
+    };
+
+  };
+
+  config = mkIf cfg.enable {
+
+    environment.systemPackages = [ pkgs.thinkfan ];
+
+    systemd.services.thinkfan = {
+      description = "Thinkfan";
+      after = [ "basic.target" ];
+      wantedBy = [ "multi-user.target" ];
+      path = [ pkgs.thinkfan ];
+      serviceConfig.ExecStart = "${pkgs.thinkfan}/bin/thinkfan -n -c ${configFile}";
+    };
+
+    boot.extraModprobeConfig = "options thinkpad_acpi experimental=1 fan_control=1";
+
+  };
+
+}