ts.conf man page on ElementaryOS

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TS.CONF(5)			     tslib			    TS.CONF(5)

NAME
       ts.conf - Configuration file for tslib, controlling touch screens for
       embedded devices.

DESCRIPTION
       The idea of tslib is to have a core library that provides standardised
       services, and a set of plugins to manage the conversion and filtering
       as needed.

       The plugins for a particular touchscreen are loaded automatically by
       the library under the control of a static configuration file,
       /etc/ts.conf.  /etc/ts.conf gives the library basic configuration
       information. Each line specifies one module, and the parameters for
       that module. The modules are loaded in order, with the first one
       processing the touchscreen data first. For example:

	     module_raw input
	     module variance delta=30
	     module dejitter delta=100
	     module linear

MODULE PARAMETERS
       variance
	   Tries to do it's best in order to filter out random noise coming
	   from touchscreen ADC's. This is achieved by limiting the sample
	   movement speed to some value (e.g. the pen is not supposed to move
	   quicker than some threshold).

	   This is a 'greedy' filter, e.g. it gives less samples on output
	   than receives on input.

	   ·   Parameters: delta.

	       Set the squared distance in touchscreen units between previous
	       and current pen position (e.g. (X2-X1)^2 + (Y2-Y1)^2). This
	       defines the criteria for determining whenever two samples are
	       'near' or 'far' to each other.

	       If the distance between previous and current sample is 'far',
	       the sample is marked as 'potential noise'. This doesn't mean
	       yet that it will be discarded; if the next reading will be
	       close to it, this will be considered just a regular 'quick
	       motion' event, and it will sneak to the next layer. Also, if
	       the sample after the 'potential noise' is 'far' from both
	       previously discussed samples, this is also considered a 'quick
	       motion' event and the sample sneaks into the output stream.

       dejitter
	   Removes jitter on the X and Y co-ordinates. This is achieved by
	   applying a weighted smoothing filter. The latest samples have most
	   weight; earlier samples have less weight. This allows to achieve
	   1:1 input->output rate.

	   ·   Parameters: delta.

	       Squared distance between two samples ((X2-X1)^2 + (Y2-Y1)^2)
	       that defines the 'quick motion' threshold. If the pen moves
	       quick, it is not feasible to smooth pen motion, besides quick
	       motion is not precise anyway; so if quick motion is detected
	       the module just discards the backlog and simply copies input to
	       output.

       linear
	   Linear scaling module, primarily used for conversion of touch
	   screen co-ordinates to screen co-ordinates.

	   ·   Parameters: xyswap.

	       Interchange the X and Y co-ordinates -- no longer used or
	       needed if the new linear calibration utility ts_calibrate is
	       used.

ENVIRONMENT VARIABLES
       Latest versions of the Xorg tslib input driver use hal to configure the
       touchscreen within Xorg. Environment variables are only needed for the
       tslib commands.

       TSLIB_TSDEVICE
	   If the default touchscreen device cannot be found, set the
	   TSLIB_TSDEVICE environment variable to the touchscreen device to
	   use.

	   Default: /dev/input/event0

       TSLIB_CONSOLEDEVICE
	   Tslib default console device.

	   Default: /dev/tty

       TSLIB_CALIBFILE
	   Stores calibration data obtained using ts_calibrate.

	   Default: /etc/pointercal

       TSLIB_CONFFILE
	   Set a different location for the ts.conf configuration file itself.

	   Default; /etc/ts.conf.

       TSLIB_FBDEVICE
	   Framebuffer device to use for the touchscreen support.

	   Default: /dev/fb0.

       TSLIB_PLUGINDIR
	   Plugin directory for tslib.

	   Default: /usr/lib/$triplet/ts0/ where triplet is the MultiArch
	   path, e.g. arm-linux-gnueabi.

AUTHOR
       This manual page was written by Neil Williams codehelp@debian.org for
       the Debian(TM) distribution because the original program does not have
       a manual page, but may be used by others. Permission is granted to
       copy, distribute and/or modify this document under the terms of the GNU
       General Public License, Version 2 any later version published by the
       Free Software Foundation.

       On Debian systems, the complete text of the GNU General Public License
       can be found in /usr/share/common-licenses/GPL.

AUTHOR
       Russell King
	   Author.

COPYRIGHT
       Copyright © 2008 Neil Williams

Debian 5		 Wed 06 Aug 2008 10:46:33 ART		    TS.CONF(5)
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