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-.. Permission is granted to copy, distribute and/or modify this
-.. document under the terms of the GNU Free Documentation License,
-.. Version 1.1 or any later version published by the Free Software
-.. Foundation, with no Invariant Sections, no Front-Cover Texts
-.. and no Back-Cover Texts. A copy of the license is included at
-.. Documentation/media/uapi/fdl-appendix.rst.
-..
-.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
-
-.. _touch:
-
-*************
-Touch Devices
-*************
-
-Touch devices are accessed through character device special files named
-``/dev/v4l-touch0`` to ``/dev/v4l-touch255`` with major number 81 and
-dynamically allocated minor numbers 0 to 255.
-
-Overview
-========
-
-Sensors may be Optical, or Projected Capacitive touch (PCT).
-
-Processing is required to analyse the raw data and produce input events. In
-some systems, this may be performed on the ASIC and the raw data is purely a
-side-channel for diagnostics or tuning. In other systems, the ASIC is a simple
-analogue front end device which delivers touch data at high rate, and any touch
-processing must be done on the host.
-
-For capacitive touch sensing, the touchscreen is composed of an array of
-horizontal and vertical conductors (alternatively called rows/columns, X/Y
-lines, or tx/rx). Mutual Capacitance measured is at the nodes where the
-conductors cross. Alternatively, Self Capacitance measures the signal from each
-column and row independently.
-
-A touch input may be determined by comparing the raw capacitance measurement to
-a no-touch reference (or "baseline") measurement:
-
-Delta = Raw - Reference
-
-The reference measurement takes account of variations in the capacitance across
-the touch sensor matrix, for example manufacturing irregularities,
-environmental or edge effects.
-
-Querying Capabilities
-=====================
-
-Devices supporting the touch interface set the ``V4L2_CAP_VIDEO_CAPTURE`` flag
-and the ``V4L2_CAP_TOUCH`` flag in the ``capabilities`` field of
-:c:type:`v4l2_capability` returned by the
-:ref:`VIDIOC_QUERYCAP` ioctl.
-
-At least one of the read/write or streaming I/O methods must be
-supported.
-
-The formats supported by touch devices are documented in
-:ref:`Touch Formats <tch-formats>`.
-
-Data Format Negotiation
-=======================
-
-A touch device may support any I/O method.