From c13f556db0f1bbb83eb80c5ae8226e7131e69928 Mon Sep 17 00:00:00 2001
From: tobhe <tobhe@cvs.openbsd.org>
Date: Fri, 23 Oct 2020 21:23:59 +0000
Subject: Subtract threshold from absolute position to allow absolute pointer
 movement smaller than threshold. Fixes an issue where the pointer sometimes
 jumped a few pixels.

ok bluhm@
---
 sys/dev/usb/utpms.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'sys')

diff --git a/sys/dev/usb/utpms.c b/sys/dev/usb/utpms.c
index e589c59040c..77f5abb1b76 100644
--- a/sys/dev/usb/utpms.c
+++ b/sys/dev/usb/utpms.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: utpms.c,v 1.10 2020/09/11 19:18:01 tobhe Exp $	*/
+/*	$OpenBSD: utpms.c,v 1.11 2020/10/23 21:23:58 tobhe Exp $	*/
 
 /*
  * Copyright (c) 2005, Johan Wallén
@@ -638,8 +638,8 @@ detect_pos(int *sensors, int n_sensors, int threshold, int fact,
 		if (sensors[i] >= threshold) {
 			if (i == 0 || sensors[i - 1] < threshold)
 				*fingers_ret += 1;
-			s += sensors[i];
-			w += sensors[i] * i;
+			s += sensors[i] - threshold;
+			w += (sensors[i] - threshold) * i;
 		}
 	}
 
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