From 50103723abbd3bd05a33f5b68869a33d14403728 Mon Sep 17 00:00:00 2001
From: Nathan McCarty <thatonelutenist@stranger.systems>
Date: Thu, 30 Jan 2025 10:45:01 -0500
Subject: [PATCH] calibrate itsd

---
 nixos/machines/crash/configuration.nix | 34 +++++++++++++++++++++++---
 1 file changed, 31 insertions(+), 3 deletions(-)

diff --git a/nixos/machines/crash/configuration.nix b/nixos/machines/crash/configuration.nix
index 2da5e5c..6a49499 100644
--- a/nixos/machines/crash/configuration.nix
+++ b/nixos/machines/crash/configuration.nix
@@ -160,12 +160,40 @@
     wl-clipboard
   ];
 
+  # We need to use a fork of iptsd for the LiftTimeout option
+  # https://github.com/linux-surface/iptsd/issues/166#issuecomment-2391567615
+  nixpkgs.overlays = let
+    iptsd_overlay = self: super: {
+      iptsd = super.iptsd.overrideAttrs (prev: {
+        src = pkgs.fetchFromGitHub {
+          owner = "wvffle";
+          repo = "iptsd";
+          rev = "9c3e4c7b85767a3239bb2ba1ee12430ba5c92a86";
+          hash = "sha256-wyCstqTpyFDLRe/AGFrjJi9A+txwkFNbsW4KLNcMf1Q=";
+        };
+      });
+    };
+  in [iptsd_overlay];
   # Setup iptsd for touch and stylus support
   services.iptsd = {
     enable = true;
-    config.Touchscreen = {
-      # DisableOnPalm = true;
-      DisableOnStylus = true;
+    config = {
+      Touchscreen = {
+        DisableOnPalm = true;
+        DisableOnStylus = true;
+      };
+      Contacts = {
+        SizeMin = "0.775";
+        SizeMax = "1.710";
+        AspectMin = "1.005";
+        AspectMax = "1.470";
+      };
+      Stylus = {
+        LiftTimeout = "0.07";
+      };
+      DFT = {
+        PositionMinAmp = "10";
+      };
     };
   };