provide resolution, those devices are correctly handled within libinput
(touchpads are not absolute devices, as mentioned above).
+@section calibration Calibration of absolute devices
+
+Absolute devices may require calibration to map precisely into the output
+range required. This is done by setting a transformation matrix, see
+libinput_device_config_calibration_set_matrix() which is applied to
+each input coordinate.
+
+@f[
+\begin{pmatrix}
+ cos\theta & -sin\theta & xoff \\
+ sin\theta & cos\theta & yoff \\
+ 0 & 0 & 1
+\end{pmatrix} \begin{pmatrix}
+x \\ y \\ 1
+\end{pmatrix}
+@f]
+
+@f$\theta@f$ is the rotation angle. The offsets @f$xoff@f$ and @f$yoff@f$ are
+specified in device dimensions, i.e. a value of 1 equals one device width
+or height. Note that rotation applies to the device's origin, rotation
+usually requires an offset to move the coordinates back into the original
+range.
+
+The most comon matrices are:
+
+- 90 degree clockwise:
+@f$
+\begin{pmatrix}
+ 0 & -1 & 1 \\
+ 1 & 0 & 0 \\
+ 0 & 0 & 1
+\end{pmatrix}
+@f$
+
+- 180 degree clockwise:
+@f$
+\begin{pmatrix}
+ -1 & 0 & 1 \\
+ 0 & -1 & 1 \\
+ 0 & 0 & 1
+\end{pmatrix}
+@f$
+
+- 270 degree clockwise:
+@f$
+\begin{pmatrix}
+ 0 & 1 & 0 \\
+ -1 & 0 & 1 \\
+ 0 & 0 & 1
+\end{pmatrix}
+@f$
+
+- reflection along y axis:
+@f$
+\begin{pmatrix}
+ -1 & 0 & 1 \\
+ 1 & 0 & 0 \\
+ 0 & 0 & 1
+\end{pmatrix}
+@f$
+
+See Wikipedia's
+<a href="http://en.wikipedia.org/wiki/Transformation_matrix">Transformation
+Matrix article</a> for more information on the matrix maths.
+
+See libinput_device_config_calibration_get_default_matrix() for how these
+matrices must be supplied to libinput.
+
@section absolute_axes_nonorm Why x/y coordinates are not normalized
x/y are not given in @ref motion_normalization "normalized coordinates"
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