From patchwork Fri Aug 12 17:16:40 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Kurtz X-Patchwork-Id: 1061632 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter2.kernel.org (8.14.4/8.14.4) with ESMTP id p7CHGw0a021677 for ; Fri, 12 Aug 2011 17:16:58 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751939Ab1HLRQ5 (ORCPT ); Fri, 12 Aug 2011 13:16:57 -0400 Received: from smtp-out.google.com ([74.125.121.67]:52311 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751587Ab1HLRQ5 (ORCPT ); Fri, 12 Aug 2011 13:16:57 -0400 Received: from wpaz9.hot.corp.google.com (wpaz9.hot.corp.google.com [172.24.198.73]) by smtp-out.google.com with ESMTP id p7CHGroO028669; Fri, 12 Aug 2011 10:16:53 -0700 Received: from puck.tpe.corp.google.com (puck.tpe.corp.google.com [172.30.210.35]) by wpaz9.hot.corp.google.com with ESMTP id p7CHGosP028836; Fri, 12 Aug 2011 10:16:51 -0700 Received: by puck.tpe.corp.google.com (Postfix, from userid 116377) id 362D380653; Sat, 13 Aug 2011 01:16:49 +0800 (CST) From: Daniel Kurtz To: chase.douglas@canonical.com, dmitry.torokhov@gmail.com, rydberg@euromail.se Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, olofj@chromium.org, chris@cnpbagwell.com, Daniel Kurtz Subject: [PATCH 1/8 v3] Input: synaptics - refactor y inversion Date: Sat, 13 Aug 2011 01:16:40 +0800 Message-Id: <1313169407-4358-2-git-send-email-djkurtz@chromium.org> X-Mailer: git-send-email 1.7.3.1 In-Reply-To: <1313169407-4358-1-git-send-email-djkurtz@chromium.org> References: <1313169407-4358-1-git-send-email-djkurtz@chromium.org> X-System-Of-Record: true Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter2.kernel.org [140.211.167.43]); Fri, 12 Aug 2011 17:16:58 +0000 (UTC) Synaptics touchpads report increasing y from bottom to top. This is inverted from normal userspace "top of screen is 0" coordinates. Thus, the kernel driver reports inverted y coordinates to userspace. This patch refactors this inversion. Signed-off-by: Daniel Kurtz Acked-by: Chase Douglas --- drivers/input/mouse/synaptics.c | 15 ++++++++++++--- 1 files changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c index 5538fc6..297e88f 100644 --- a/drivers/input/mouse/synaptics.c +++ b/drivers/input/mouse/synaptics.c @@ -44,6 +44,16 @@ #define YMIN_NOMINAL 1408 #define YMAX_NOMINAL 4448 +/* + * Synaptics touchpads report the y coordinate from bottom to top, which is + * opposite from what userspace expects. + * This function is used to invert y before reporting. + */ +static int invert_y(int y) +{ + return YMAX_NOMINAL + YMIN_NOMINAL - y; +} + /***************************************************************************** * Stuff we need even when we do not want native Synaptics support @@ -502,8 +512,7 @@ static void synaptics_report_semi_mt_slot(struct input_dev *dev, int slot, input_mt_report_slot_state(dev, MT_TOOL_FINGER, active); if (active) { input_report_abs(dev, ABS_MT_POSITION_X, x); - input_report_abs(dev, ABS_MT_POSITION_Y, - YMAX_NOMINAL + YMIN_NOMINAL - y); + input_report_abs(dev, ABS_MT_POSITION_Y, invert_y(y)); } } @@ -597,7 +606,7 @@ static void synaptics_process_packet(struct psmouse *psmouse) if (num_fingers > 0) { input_report_abs(dev, ABS_X, hw.x); - input_report_abs(dev, ABS_Y, YMAX_NOMINAL + YMIN_NOMINAL - hw.y); + input_report_abs(dev, ABS_Y, invert_y(hw.y)); } input_report_abs(dev, ABS_PRESSURE, hw.z);