Provided by: libts0_1.15-1_amd64 
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 standard 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
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 when using ts_setup(): We try to open /dev/input/ts, /dev/input/touchscreen
and /dev/touchscreen/ucb1x00 and on Linux, we then scan /dev/input/event* for the
first device with property INPUT_PROP_DIRECT.
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.
MODULE PARAMETERS
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 one to achieve 1:1 input->output rate.
• 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.
• xyswap
Interchange the X and Y co-ordinates -- no longer used or needed if the new linear
calibration utility ts_calibrate is used.
• pressure_offset
Offset applied to the pressure value. Default: 0.
• pressure_mul
Factor to multiply the pressure value with. Default: 1.
• pressure_div
Value to divide the pressure value by. Default: 1.
iir
Infinite impulse response filter. Similar to dejitter, this is a smoothing filter to
remove low-level noise. There is a trade-off between noise removal (smoothing) and
responsiveness. The parameters N and D specify the level of smoothing in the form of a
fraction (N/D).
• N
numerator of the smoothing fraction. Default: 0.
• D
denominator of the smoothing fraction. Default: 1.
pthres
Pressure threshold filter. Given a release is always pressure 0 and a press is always
>= 1, this discards samples below / above the specified pressure threshold.
• pmin
Minimum pressure value for a sample to be valid. Default: 1.
• pmax
Maximum pressure value for a sample to be valid. Default: INT_MAX.
debounce
Simple debounce mechanism that drops input events for the specified time after a touch
gesture stopped.
• drop_threshold
drop events up to this number of milliseconds after the last release event.
Default: 0.
skip
Skip nhead samples after press and ntail samples before release. This should help if
for the device the first or last samples are unreliable.
• nhead
Number of events to drop after pressure. Default: 1.
• ntail
Number of events to drop before release. Default: 1.
median
Similar to what the variance filter does, the median filter suppresses spikes in the
gesture.
• depth
Number of samples to apply the median filter to. Default: 3.
invert
Invert values in X and/or Y direction around a given value.
• x0
X-axis (horizontal) value around which to invert. Default: 0.
• y0
Y-axis (horizontal) value around which to invert. Default: 0.
lowpass
simple exponential averaging lowpass filter
• factor
floating point values betwenn 0 and 1. Default: 0.4.
• threshold
x or y minimum distance between two samples to start applying the filter. Default:
2.
variance
Tries to do it's best in order to filter out random noise coming from touchscreen
ADCs. 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.
There is no multitouch support for this filter.
• 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.
hardware support
On Linux, use the module_raw input if you can. The other raw access modules are device
specific userspace drivers. If you need one of those, enable it explicitly when building
tslib. The list of modules enabled by default might shrink in the future. module_raw
input supports multitouch (MT) too.
┌────────────────┬───────────────────────────────┬──────────────────────────┬─────────────────────────┬─────┬──────────────────────────┐
│module_raw │ supported devices │ interface │ platforms │ MT │ how to enable │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│input │ all with Linux evdev drivers │ any (driver) /dev/input/ │ Linux, FreeBSD │ yes │ enabled by default │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│arctic2 │ IBM Arctic II │ . │ Linux, BSD, Hurd, Haiku │ no │ --enable-arctic2 │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│collie │ Sharp Zaurus SL-5000d/SL-5500 │ . │ Linux, BSD, Hurd, Haiku │ no │ --enable-collie │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│corgi │ Sharp Zaurus SL-C700 │ . │ Linux, BSD, Hurd, Haiku │ no │ --enable-corgi │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│dmc_dus3000 │ DMC DUS Series (DUS3000, ...) │ UART │ Linux │ no │ --enable-dmc_dus3000 │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│dmc │ DMC (others) │ . │ Linux, BSD, Hurd, Haiku │ no │ --enable-dmc │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│galax │ eGalax 100, 112, 210 │ any (driver) │ Linux, BSD │ no │ --enable-galax │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│h3600 │ Compaq IPAQ │ . │ Linux, BSD, Hurd, Haiku │ no │ --enable-h3600 │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│mk712 │ Hitachi Webpad │ . │ Linux, BSD, Hurd, Haiku │ no │ --enable-mk712 │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│tatung │ Tatung Webpad │ . │ Linux, BSD, Hurd, Haiku │ no │ enabled by default │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│touchkit │ Touchkit SAT4000UR │ RS232 │ Linux, BSD, Hurd │ no │ enabled by default │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│ucb1x00 │ UCB1x00 Touchscreens │ . │ Linux, BSD, Hurd, Haiku │ no │ --enable-ucb1x00 │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│waveshare │ Waveshare Touchscreens │ /dev/hidrawX │ Linux │ no │ enabled by default │
├────────────────┼───────────────────────────────┼──────────────────────────┼─────────────────────────┼─────┼──────────────────────────┤
│cy8mrln_palmpre │ in Palm Pre/Pre Plus/Pre 2 │ . │ Linux │ no │ --enable-cy8mrln-palmpre │
└────────────────┴───────────────────────────────┴──────────────────────────┴─────────────────────────┴─────┴──────────────────────────┘
SEE ALSO
ts_calibrate(1), ts_test(1), ts_test_mt(1)
TS.CONF(5)