thinkpad: only enable tp_smapi on compatible ThinkPads, closes #36

lenovo/thinkpad/tp-smapi.nix

@@ -0,0 +1,11 @@
+# tp_smapi works on ThinkPads made before 2013. See compat table:
+# https://www.thinkwiki.org/wiki/Tp_smapi#Model-specific_status
+
+{ config, ... }:
+
+{
+  boot = {
+    kernelModules = [ "tp_smapi" ];
+    extraModulePackages = with config.boot.kernelPackages; [ tp_smapi ];
+  };
+}