From c909ea920855c21beba3b9fca4b59432ca1ecc01 Mon Sep 17 00:00:00 2001
From: Shea Levy <shea@shealevy.com>
Date: Sat, 14 Jul 2012 18:02:46 -0400
Subject: [PATCH] multitouch: Add option to invert scroll

---
 modules/services/x11/hardware/multitouch.nix | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/modules/services/x11/hardware/multitouch.nix b/modules/services/x11/hardware/multitouch.nix
index 3aa2760f3f0e..35e30ccf76b3 100644
--- a/modules/services/x11/hardware/multitouch.nix
+++ b/modules/services/x11/hardware/multitouch.nix
@@ -14,6 +14,13 @@ with pkgs.lib;
         description = "Whether to enable multitouch touchpad support.";
       };
 
+      invertScroll = mkOption {
+        default = false;
+        example = true;
+        type = types.bool;
+        description = "Whether to invert scrolling direction à la OSX Lion";
+      };
+
     };
 
   };
@@ -29,6 +36,10 @@ with pkgs.lib;
           MatchIsTouchpad "on"
           Identifier "Touchpads"
           Driver "mtrack"
+          ${optionalString config.services.xserver.multitouch.invertScroll ''
+            Option "ScrollUpButton" "5"
+            Option "ScrollDownButton" "4"
+          ''}
         EndSection
       '';