From owner-svn-src-all@FreeBSD.ORG  Sun Nov 29 20:48:20 2009
Return-Path: <owner-svn-src-all@FreeBSD.ORG>
Delivered-To: svn-src-all@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 4EEAE106566C;
	Sun, 29 Nov 2009 20:48:20 +0000 (UTC)
	(envelope-from nwhitehorn@FreeBSD.org)
Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c])
	by mx1.freebsd.org (Postfix) with ESMTP id 3EEEF8FC1B;
	Sun, 29 Nov 2009 20:48:20 +0000 (UTC)
Received: from svn.freebsd.org (localhost [127.0.0.1])
	by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id nATKmKZ6008769;
	Sun, 29 Nov 2009 20:48:20 GMT
	(envelope-from nwhitehorn@svn.freebsd.org)
Received: (from nwhitehorn@localhost)
	by svn.freebsd.org (8.14.3/8.14.3/Submit) id nATKmKVc008767;
	Sun, 29 Nov 2009 20:48:20 GMT
	(envelope-from nwhitehorn@svn.freebsd.org)
Message-Id: <200911292048.nATKmKVc008767@svn.freebsd.org>
From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Sun, 29 Nov 2009 20:48:20 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
	svn-src-head@freebsd.org
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: 
Subject: svn commit: r199948 - head/sys/dev/usb/input
X-BeenThere: svn-src-all@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "SVN commit messages for the entire src tree \(except for &quot;
	user&quot; and &quot; projects&quot; \)" <svn-src-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-all>
List-Post: <mailto:svn-src-all@freebsd.org>
List-Help: <mailto:svn-src-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 29 Nov 2009 20:48:20 -0000

Author: nwhitehorn
Date: Sun Nov 29 20:48:19 2009
New Revision: 199948
URL: http://svn.freebsd.org/changeset/base/199948

Log:
  Early-generation touchpads do not send periodic calibration frames for
  baseline subtraction, and are very temperature sensitive, so would slowly
  drift out of a calibrated state when under load. Escape this by taking
  the last frame before we decide that the pad is idle as a finger-free
  baseline.
  
  Tested on:	iBook G4

Modified:
  head/sys/dev/usb/input/atp.c

Modified: head/sys/dev/usb/input/atp.c
==============================================================================
--- head/sys/dev/usb/input/atp.c	Sun Nov 29 20:47:43 2009	(r199947)
+++ head/sys/dev/usb/input/atp.c	Sun Nov 29 20:48:19 2009	(r199948)
@@ -1850,6 +1850,21 @@ atp_intr(struct usb_xfer *xfer, usb_erro
 			sc->sc_idlecount++;
 			if (sc->sc_idlecount >= ATP_IDLENESS_THRESHOLD) {
 				DPRINTFN(ATP_LLEVEL_INFO, "idle\n");
+
+				/*
+				 * Use the last frame before we go idle for
+				 * calibration on pads which do not send
+				 * calibration frames.
+				 */
+				if (sc->sc_params->prot < ATP_PROT_GEYSER3) {
+					memcpy(sc->base_x, sc->cur_x,
+					    sc->sc_params->n_xsensors *
+					    sizeof(*(sc->base_x)));
+					memcpy(sc->base_y, sc->cur_y,
+					    sc->sc_params->n_ysensors *
+					    sizeof(*(sc->base_y)));
+				}
+
 				sc->sc_idlecount = 0;
 				usbd_transfer_start(sc->sc_xfer[ATP_RESET]);
 			}