linux-kernel - Re: [PATCH] input: Add a detailed multi-touch finger data report protocol

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <49157FE7.7040503@euromail.se>
Date:	Sat, 08 Nov 2008 13:02:47 +0100
From:	Henrik Rydberg <rydberg@...omail.se>
To:	Arjan Opmeer <arjan@...eer.net>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: Add a detailed multi-touch finger data report
 protocol

>> The minimum set of data is TOUCH, POSITION_X and POSITION_Y. If touch
>> pressure information is not given in trackpad dimension units, use a
>> specific range.
> 
> The Elantech touchpad does not seem to be able to report pressure, only
> finger coordinates.

I was envisioning a binary TOUCH value, but it is arguably redundant.

>> I believe all current drivers are able to produce this data.
> 
> The Elantech driver is not... :)

So only POSITION_X and POSITION_Y for elantech, then :-)

>> It is designed to bring advanced gestures to the linux desktop.
> 
> Certainly. Have you already thought about the rest of the path from driver
> to application, ie kernel driver -> X.org driver -> X events -> toolkit
> events -> application?

I am involved in the synaptics Xorg driver. I have an experimental Xorg
driver utilizing the multi-touch interface. The plan is to map stable
gestures to the existing toolkit events, removing the need for programs
like syndaemon.

> For instance does the X.org driver interpret the data and emit a zoom or
> rotate event based on the finger position and movement? As far as I know
> those event do not exist and would have to be added to X.org as well as the
> toolkits like GTK+ and Qt. It could be a long implementation process... :(

Every journey begins with a step.

Henrik

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/