[media] Documentation: add support for V4L touch devices
Document the new touch API. Signed-off-by: Nick Dyer <nick@shmanahar.org> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> [hans.verkuil@cisco.com: fix up videodev2.h.rst.exceptions] Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Nick Dyer
Mauro Carvalho Chehab
Родитель
b497265266
Коммит
233b213a31
|
|
@ -437,6 +437,16 @@ Types and flags used to represent the media graph elements
|
|||
|
||||
- .. row 11
|
||||
|
||||
.. _MEDIA-INTF-T-V4L-TOUCH:
|
||||
|
||||
- ``MEDIA_INTF_T_V4L_TOUCH``
|
||||
|
||||
- Device node interface for Touch device (V4L)
|
||||
|
||||
- typically, /dev/v4l-touch?
|
||||
|
||||
- .. row 12
|
||||
|
||||
.. _MEDIA-INTF-T-ALSA-PCM-CAPTURE:
|
||||
|
||||
- ``MEDIA_INTF_T_ALSA_PCM_CAPTURE``
|
||||
|
|
@ -445,7 +455,7 @@ Types and flags used to represent the media graph elements
|
|||
|
||||
- typically, /dev/snd/pcmC?D?c
|
||||
|
||||
- .. row 12
|
||||
- .. row 13
|
||||
|
||||
.. _MEDIA-INTF-T-ALSA-PCM-PLAYBACK:
|
||||
|
||||
|
|
@ -455,7 +465,7 @@ Types and flags used to represent the media graph elements
|
|||
|
||||
- typically, /dev/snd/pcmC?D?p
|
||||
|
||||
- .. row 13
|
||||
- .. row 14
|
||||
|
||||
.. _MEDIA-INTF-T-ALSA-CONTROL:
|
||||
|
||||
|
|
@ -465,7 +475,7 @@ Types and flags used to represent the media graph elements
|
|||
|
||||
- typically, /dev/snd/controlC?
|
||||
|
||||
- .. row 14
|
||||
- .. row 15
|
||||
|
||||
.. _MEDIA-INTF-T-ALSA-COMPRESS:
|
||||
|
||||
|
|
@ -475,7 +485,7 @@ Types and flags used to represent the media graph elements
|
|||
|
||||
- typically, /dev/snd/compr?
|
||||
|
||||
- .. row 15
|
||||
- .. row 16
|
||||
|
||||
.. _MEDIA-INTF-T-ALSA-RAWMIDI:
|
||||
|
||||
|
|
@ -485,7 +495,7 @@ Types and flags used to represent the media graph elements
|
|||
|
||||
- typically, /dev/snd/midi?
|
||||
|
||||
- .. row 16
|
||||
- .. row 17
|
||||
|
||||
.. _MEDIA-INTF-T-ALSA-HWDEP:
|
||||
|
||||
|
|
@ -495,7 +505,7 @@ Types and flags used to represent the media graph elements
|
|||
|
||||
- typically, /dev/snd/hwC?D?
|
||||
|
||||
- .. row 17
|
||||
- .. row 18
|
||||
|
||||
.. _MEDIA-INTF-T-ALSA-SEQUENCER:
|
||||
|
||||
|
|
@ -505,7 +515,7 @@ Types and flags used to represent the media graph elements
|
|||
|
||||
- typically, /dev/snd/seq
|
||||
|
||||
- .. row 18
|
||||
- .. row 19
|
||||
|
||||
.. _MEDIA-INTF-T-ALSA-TIMER:
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,56 @@
|
|||
.. -*- coding: utf-8; mode: rst -*-
|
||||
|
||||
.. _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
|
||||
:ref:`v4l2_capability <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.
|
||||
|
|
@ -22,5 +22,6 @@ Interfaces
|
|||
dev-radio
|
||||
dev-rds
|
||||
dev-sdr
|
||||
dev-touch
|
||||
dev-event
|
||||
dev-subdev
|
||||
|
|
|
|||
|
|
@ -0,0 +1,80 @@
|
|||
.. -*- coding: utf-8; mode: rst -*-
|
||||
|
||||
.. _V4L2-TCH-FMT-DELTA-TD08:
|
||||
|
||||
********************************
|
||||
V4L2_TCH_FMT_DELTA_TD08 ('TD08')
|
||||
********************************
|
||||
|
||||
*man V4L2_TCH_FMT_DELTA_TD08(2)*
|
||||
|
||||
8-bit signed Touch Delta
|
||||
|
||||
Description
|
||||
===========
|
||||
|
||||
This format represents delta data from a touch controller.
|
||||
|
||||
Delta values may range from -128 to 127. Typically the values will vary through
|
||||
a small range depending on whether the sensor is touched or not. The full value
|
||||
may be seen if one of the touchscreen nodes has a fault or the line is not
|
||||
connected.
|
||||
|
||||
**Byte Order.**
|
||||
Each cell is one byte.
|
||||
|
||||
|
||||
|
||||
.. flat-table::
|
||||
:header-rows: 0
|
||||
:stub-columns: 0
|
||||
:widths: 2 1 1 1 1
|
||||
|
||||
|
||||
- .. row 1
|
||||
|
||||
- start + 0:
|
||||
|
||||
- D'\ :sub:`00`
|
||||
|
||||
- D'\ :sub:`01`
|
||||
|
||||
- D'\ :sub:`02`
|
||||
|
||||
- D'\ :sub:`03`
|
||||
|
||||
- .. row 2
|
||||
|
||||
- start + 4:
|
||||
|
||||
- D'\ :sub:`10`
|
||||
|
||||
- D'\ :sub:`11`
|
||||
|
||||
- D'\ :sub:`12`
|
||||
|
||||
- D'\ :sub:`13`
|
||||
|
||||
- .. row 3
|
||||
|
||||
- start + 8:
|
||||
|
||||
- D'\ :sub:`20`
|
||||
|
||||
- D'\ :sub:`21`
|
||||
|
||||
- D'\ :sub:`22`
|
||||
|
||||
- D'\ :sub:`23`
|
||||
|
||||
- .. row 4
|
||||
|
||||
- start + 12:
|
||||
|
||||
- D'\ :sub:`30`
|
||||
|
||||
- D'\ :sub:`31`
|
||||
|
||||
- D'\ :sub:`32`
|
||||
|
||||
- D'\ :sub:`33`
|
||||
|
|
@ -0,0 +1,111 @@
|
|||
.. -*- coding: utf-8; mode: rst -*-
|
||||
|
||||
.. _V4L2-TCH-FMT-DELTA-TD16:
|
||||
|
||||
********************************
|
||||
V4L2_TCH_FMT_DELTA_TD16 ('TD16')
|
||||
********************************
|
||||
|
||||
*man V4L2_TCH_FMT_DELTA_TD16(2)*
|
||||
|
||||
16-bit signed Touch Delta
|
||||
|
||||
|
||||
Description
|
||||
===========
|
||||
|
||||
This format represents delta data from a touch controller.
|
||||
|
||||
Delta values may range from -32768 to 32767. Typically the values will vary
|
||||
through a small range depending on whether the sensor is touched or not. The
|
||||
full value may be seen if one of the touchscreen nodes has a fault or the line
|
||||
is not connected.
|
||||
|
||||
**Byte Order.**
|
||||
Each cell is one byte.
|
||||
|
||||
.. flat-table::
|
||||
:header-rows: 0
|
||||
:stub-columns: 0
|
||||
:widths: 2 1 1 1 1 1 1 1 1
|
||||
|
||||
|
||||
- .. row 1
|
||||
|
||||
- start + 0:
|
||||
|
||||
- D'\ :sub:`00high`
|
||||
|
||||
- D'\ :sub:`00low`
|
||||
|
||||
- D'\ :sub:`01high`
|
||||
|
||||
- D'\ :sub:`01low`
|
||||
|
||||
- D'\ :sub:`02high`
|
||||
|
||||
- D'\ :sub:`02low`
|
||||
|
||||
- D'\ :sub:`03high`
|
||||
|
||||
- D'\ :sub:`03low`
|
||||
|
||||
- .. row 2
|
||||
|
||||
- start + 8:
|
||||
|
||||
- D'\ :sub:`10high`
|
||||
|
||||
- D'\ :sub:`10low`
|
||||
|
||||
- D'\ :sub:`11high`
|
||||
|
||||
- D'\ :sub:`11low`
|
||||
|
||||
- D'\ :sub:`12high`
|
||||
|
||||
- D'\ :sub:`12low`
|
||||
|
||||
- D'\ :sub:`13high`
|
||||
|
||||
- D'\ :sub:`13low`
|
||||
|
||||
- .. row 3
|
||||
|
||||
- start + 16:
|
||||
|
||||
- D'\ :sub:`20high`
|
||||
|
||||
- D'\ :sub:`20low`
|
||||
|
||||
- D'\ :sub:`21high`
|
||||
|
||||
- D'\ :sub:`21low`
|
||||
|
||||
- D'\ :sub:`22high`
|
||||
|
||||
- D'\ :sub:`22low`
|
||||
|
||||
- D'\ :sub:`23high`
|
||||
|
||||
- D'\ :sub:`23low`
|
||||
|
||||
- .. row 4
|
||||
|
||||
- start + 24:
|
||||
|
||||
- D'\ :sub:`30high`
|
||||
|
||||
- D'\ :sub:`30low`
|
||||
|
||||
- D'\ :sub:`31high`
|
||||
|
||||
- D'\ :sub:`31low`
|
||||
|
||||
- D'\ :sub:`32high`
|
||||
|
||||
- D'\ :sub:`32low`
|
||||
|
||||
- D'\ :sub:`33high`
|
||||
|
||||
- D'\ :sub:`33low`
|
||||
|
|
@ -0,0 +1,78 @@
|
|||
.. -*- coding: utf-8; mode: rst -*-
|
||||
|
||||
.. _V4L2-TCH-FMT-TU08:
|
||||
|
||||
**************************
|
||||
V4L2_TCH_FMT_TU08 ('TU08')
|
||||
**************************
|
||||
|
||||
*man V4L2_TCH_FMT_TU08(2)*
|
||||
|
||||
8-bit unsigned raw touch data
|
||||
|
||||
Description
|
||||
===========
|
||||
|
||||
This format represents unsigned 8-bit data from a touch controller.
|
||||
|
||||
This may be used for output for raw and reference data. Values may range from
|
||||
0 to 255.
|
||||
|
||||
**Byte Order.**
|
||||
Each cell is one byte.
|
||||
|
||||
|
||||
|
||||
.. flat-table::
|
||||
:header-rows: 0
|
||||
:stub-columns: 0
|
||||
:widths: 2 1 1 1 1
|
||||
|
||||
|
||||
- .. row 1
|
||||
|
||||
- start + 0:
|
||||
|
||||
- R'\ :sub:`00`
|
||||
|
||||
- R'\ :sub:`01`
|
||||
|
||||
- R'\ :sub:`02`
|
||||
|
||||
- R'\ :sub:`03`
|
||||
|
||||
- .. row 2
|
||||
|
||||
- start + 4:
|
||||
|
||||
- R'\ :sub:`10`
|
||||
|
||||
- R'\ :sub:`11`
|
||||
|
||||
- R'\ :sub:`12`
|
||||
|
||||
- R'\ :sub:`13`
|
||||
|
||||
- .. row 3
|
||||
|
||||
- start + 8:
|
||||
|
||||
- R'\ :sub:`20`
|
||||
|
||||
- R'\ :sub:`21`
|
||||
|
||||
- R'\ :sub:`22`
|
||||
|
||||
- R'\ :sub:`23`
|
||||
|
||||
- .. row 4
|
||||
|
||||
- start + 12:
|
||||
|
||||
- R'\ :sub:`30`
|
||||
|
||||
- R'\ :sub:`31`
|
||||
|
||||
- R'\ :sub:`32`
|
||||
|
||||
- R'\ :sub:`33`
|
||||
|
|
@ -0,0 +1,110 @@
|
|||
.. -*- coding: utf-8; mode: rst -*-
|
||||
|
||||
.. _V4L2-TCH-FMT-TU16:
|
||||
|
||||
********************************
|
||||
V4L2_TCH_FMT_TU16 ('TU16')
|
||||
********************************
|
||||
|
||||
*man V4L2_TCH_FMT_TU16(2)*
|
||||
|
||||
16-bit unsigned raw touch data
|
||||
|
||||
|
||||
Description
|
||||
===========
|
||||
|
||||
This format represents unsigned 16-bit data from a touch controller.
|
||||
|
||||
This may be used for output for raw and reference data. Values may range from
|
||||
0 to 65535.
|
||||
|
||||
**Byte Order.**
|
||||
Each cell is one byte.
|
||||
|
||||
|
||||
.. flat-table::
|
||||
:header-rows: 0
|
||||
:stub-columns: 0
|
||||
:widths: 2 1 1 1 1 1 1 1 1
|
||||
|
||||
|
||||
- .. row 1
|
||||
|
||||
- start + 0:
|
||||
|
||||
- R'\ :sub:`00high`
|
||||
|
||||
- R'\ :sub:`00low`
|
||||
|
||||
- R'\ :sub:`01high`
|
||||
|
||||
- R'\ :sub:`01low`
|
||||
|
||||
- R'\ :sub:`02high`
|
||||
|
||||
- R'\ :sub:`02low`
|
||||
|
||||
- R'\ :sub:`03high`
|
||||
|
||||
- R'\ :sub:`03low`
|
||||
|
||||
- .. row 2
|
||||
|
||||
- start + 8:
|
||||
|
||||
- R'\ :sub:`10high`
|
||||
|
||||
- R'\ :sub:`10low`
|
||||
|
||||
- R'\ :sub:`11high`
|
||||
|
||||
- R'\ :sub:`11low`
|
||||
|
||||
- R'\ :sub:`12high`
|
||||
|
||||
- R'\ :sub:`12low`
|
||||
|
||||
- R'\ :sub:`13high`
|
||||
|
||||
- R'\ :sub:`13low`
|
||||
|
||||
- .. row 3
|
||||
|
||||
- start + 16:
|
||||
|
||||
- R'\ :sub:`20high`
|
||||
|
||||
- R'\ :sub:`20low`
|
||||
|
||||
- R'\ :sub:`21high`
|
||||
|
||||
- R'\ :sub:`21low`
|
||||
|
||||
- R'\ :sub:`22high`
|
||||
|
||||
- R'\ :sub:`22low`
|
||||
|
||||
- R'\ :sub:`23high`
|
||||
|
||||
- R'\ :sub:`23low`
|
||||
|
||||
- .. row 4
|
||||
|
||||
- start + 24:
|
||||
|
||||
- R'\ :sub:`30high`
|
||||
|
||||
- R'\ :sub:`30low`
|
||||
|
||||
- R'\ :sub:`31high`
|
||||
|
||||
- R'\ :sub:`31low`
|
||||
|
||||
- R'\ :sub:`32high`
|
||||
|
||||
- R'\ :sub:`32low`
|
||||
|
||||
- R'\ :sub:`33high`
|
||||
|
||||
- R'\ :sub:`33low`
|
||||
|
|
@ -32,4 +32,5 @@ see also :ref:`VIDIOC_G_FBUF <VIDIOC_G_FBUF>`.)
|
|||
depth-formats
|
||||
pixfmt-013
|
||||
sdr-formats
|
||||
tch-formats
|
||||
pixfmt-reserved
|
||||
|
|
|
|||
|
|
@ -0,0 +1,18 @@
|
|||
.. -*- coding: utf-8; mode: rst -*-
|
||||
|
||||
.. _tch-formats:
|
||||
|
||||
*************
|
||||
Touch Formats
|
||||
*************
|
||||
|
||||
These formats are used for :ref:`touch` interface only.
|
||||
|
||||
|
||||
.. toctree::
|
||||
:maxdepth: 1
|
||||
|
||||
pixfmt-tch-td16
|
||||
pixfmt-tch-td08
|
||||
pixfmt-tch-tu16
|
||||
pixfmt-tch-tu08
|
||||
|
|
@ -175,6 +175,14 @@ at index zero, incrementing by one until the driver returns ``EINVAL``.
|
|||
- Analog baseband input, for example CVBS / Composite Video,
|
||||
S-Video, RGB.
|
||||
|
||||
- .. row 3
|
||||
|
||||
- ``V4L2_INPUT_TYPE_TOUCH``
|
||||
|
||||
- 3
|
||||
|
||||
- This input is a touch device for capturing raw touch data.
|
||||
|
||||
|
||||
|
||||
.. tabularcolumns:: |p{4.8cm}|p{2.6cm}|p{10.1cm}|
|
||||
|
|
|
|||
|
|
@ -410,6 +410,14 @@ specification the ioctl returns an ``EINVAL`` error code.
|
|||
|
||||
- .. row 26
|
||||
|
||||
- ``V4L2_CAP_TOUCH``
|
||||
|
||||
- 0x10000000
|
||||
|
||||
- This is a touch device.
|
||||
|
||||
- .. row 27
|
||||
|
||||
- ``V4L2_CAP_DEVICE_CAPS``
|
||||
|
||||
- 0x80000000
|
||||
|
|
|
|||
|
|
@ -152,6 +152,7 @@ replace define V4L2_CAP_READWRITE device-capabilities
|
|||
replace define V4L2_CAP_ASYNCIO device-capabilities
|
||||
replace define V4L2_CAP_STREAMING device-capabilities
|
||||
replace define V4L2_CAP_DEVICE_CAPS device-capabilities
|
||||
replace define V4L2_CAP_TOUCH device-capabilities
|
||||
|
||||
# V4L2 pix flags
|
||||
replace define V4L2_PIX_FMT_PRIV_MAGIC v4l2-pix-format
|
||||
|
|
@ -285,6 +286,7 @@ replace define V4L2_DV_BT_CAP_CUSTOM framebuffer-cap
|
|||
|
||||
replace define V4L2_INPUT_TYPE_TUNER input-type
|
||||
replace define V4L2_INPUT_TYPE_CAMERA input-type
|
||||
replace define V4L2_INPUT_TYPE_TOUCH input-type
|
||||
|
||||
replace define V4L2_IN_ST_NO_POWER input-status
|
||||
replace define V4L2_IN_ST_NO_SIGNAL input-status
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче