Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Benjamin Tissoires , Dmitry Torokhov Subject: [PATCH 4.0 124/148] Input: elantech - fix semi-mt protocol for v3 HW Date: Wed, 3 Jun 2015 21:09:54 +0900 Message-Id: <20150603114210.786758623@linuxfoundation.org> In-Reply-To: <20150603114205.337615117@linuxfoundation.org> References: <20150603114205.337615117@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Benjamin Tissoires commit 3c0213d17a09601e0c6c0ae0e27caf70d988290f upstream. When the v3 hardware sees more than one finger, it uses the semi-mt protocol to report the touches. However, it currently works when num_fingers is 0, 1 or 2, but when it is 3 and above, it sends only 1 finger as if num_fingers was 1. This confuses userspace which knows how to deal with extra fingers when all the slots are used, but not when some are missing. Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=90101 Signed-off-by: Benjamin Tissoires Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/input/mouse/elantech.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/input/mouse/elantech.c +++ b/drivers/input/mouse/elantech.c @@ -315,7 +315,7 @@ static void elantech_report_semi_mt_data unsigned int x2, unsigned int y2) { elantech_set_slot(dev, 0, num_fingers != 0, x1, y1); - elantech_set_slot(dev, 1, num_fingers == 2, x2, y2); + elantech_set_slot(dev, 1, num_fingers >= 2, x2, y2); } /*