From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933266AbZHDWAU (ORCPT ); Tue, 4 Aug 2009 18:00:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933191AbZHDWAT (ORCPT ); Tue, 4 Aug 2009 18:00:19 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:36920 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933186AbZHDWAS (ORCPT ); Tue, 4 Aug 2009 18:00:18 -0400 Date: Wed, 5 Aug 2009 00:00:10 +0200 From: Pavel Machek To: kernel list , Greg KH Cc: arve@android.com Subject: synaptics touchscreen for dream: documentation Message-ID: <20090804220009.GA2077@elf.ucw.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds pointer to hardware documentation, and adds code comment from Arve. Signed-off-by: Pavel Machek diff --git a/drivers/staging/dream/synaptics_i2c_rmi.c b/drivers/staging/dream/synaptics_i2c_rmi.c index 3770d2c..dc1e3c7 100644 --- a/drivers/staging/dream/synaptics_i2c_rmi.c +++ b/drivers/staging/dream/synaptics_i2c_rmi.c @@ -13,6 +13,7 @@ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * + * http://www.synaptics.com/sites/default/files/511_000099_01F.pdf */ #include @@ -87,6 +88,22 @@ static int synaptics_init_panel(struct synaptics_ts_data *ts) static void decode_report(struct synaptics_ts_data *ts, u8 *buf) { +/* + * This sensor sends two 6-byte absolute finger reports, an optional + * 2-byte relative report followed by a status byte. This function + * reads the two finger reports and transforms the coordinates + * according the platform data so they can be aligned with the lcd + * behind the touchscreen. Typically we flip the y-axis since the + * sensor uses the bottom left corner as the origin, but if the sensor + * is mounted upside down the platform data will request that the + * x-axis should be flipped instead. The snap to inactive edge border + * are used to allow tapping the edges of the screen on the G1. The + * active area of the touchscreen is smaller than the lcd. When the + * finger gets close the edge of the screen we snap it to the + * edge. This allows ui elements at the edge of the screen to be hit, + * and it prevents hitting ui elements that are not at the edge of the + * screen when the finger is touching the edge. + */ int pos[2][2]; int f, a; int base = 2; -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html