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


       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


           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.

           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

           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


       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.

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

           Default: /dev/input/event0

           Tslib default console device.

           Default: /dev/tty

           Stores calibration data obtained using ts_calibrate.

           Default: /etc/pointercal

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

           Default; /etc/ts.conf.

           Framebuffer device to use for the touchscreen support.

           Default: /dev/fb0.

           Plugin directory for tslib.

           Default: /usr/lib/ts/.


       This manual page was written by Neil Williams <> 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.


       Russell King


       Copyright © 2008 Neil Williams