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[media] doc-rst: make CEC look more like other parts of the book

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Better organize the contents of the CEC part, moving the
introduction to chapter 1, placing all ioctls at chapter 2
and numerating all chapters and items.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-07-09 11:20:46 -03:00
parent 96f69e0eef
commit da98a79ba7
3 changed files with 57 additions and 55 deletions
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60
Documentation/media/uapi/cec/cec-api.rst
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@ -10,65 +10,15 @@ CEC API
.. _cec-api: .. _cec-api:
********************************* This part describes the CEC: Consumer Electronics Control
CEC: Consumer Electronics Control
*********************************
.. _cec-intro:
Introduction
============
Note: this documents the proposed CEC API. This API is not yet finalized
and is currently only available as a staging kernel module.
HDMI connectors provide a single pin for use by the Consumer Electronics
Control protocol. This protocol allows different devices connected by an
HDMI cable to communicate. The protocol for CEC version 1.4 is defined
in supplements 1 (CEC) and 2 (HEAC or HDMI Ethernet and Audio Return
Channel) of the HDMI 1.4a (:ref:`hdmi`) specification and the
extensions added to CEC version 2.0 are defined in chapter 11 of the
HDMI 2.0 (:ref:`hdmi2`) specification.
The bitrate is very slow (effectively no more than 36 bytes per second)
and is based on the ancient AV.link protocol used in old SCART
connectors. The protocol closely resembles a crazy Rube Goldberg
contraption and is an unholy mix of low and high level messages. Some
messages, especially those part of the HEAC protocol layered on top of
CEC, need to be handled by the kernel, others can be handled either by
the kernel or by userspace.
In addition, CEC can be implemented in HDMI receivers, transmitters and
in USB devices that have an HDMI input and an HDMI output and that
control just the CEC pin.
Drivers that support CEC will create a CEC device node (/dev/cecX) to
give userspace access to the CEC adapter. The
:ref:`CEC_ADAP_G_CAPS` ioctl will tell
userspace what it is allowed to do.
.. _cec-user-func:
******************
Function Reference
******************
.. toctree:: .. toctree::
:maxdepth: 1 :maxdepth: 1
:numbered:
:caption: Table of Contents
cec-func-open cec-intro
cec-func-close cec-funcs
cec-func-ioctl
cec-func-poll
cec-ioc-adap-g-caps
cec-ioc-adap-g-log-addrs
cec-ioc-adap-g-phys-addr
cec-ioc-dqevent
cec-ioc-g-mode
cec-ioc-receive
cec-header cec-header

21
Documentation/media/uapi/cec/cec-funcs.rst Normal file
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@ -0,0 +1,21 @@
.. _cec-user-func:
******************
Function Reference
******************
.. toctree::
:maxdepth: 1
:numbered:
cec-func-open
cec-func-close
cec-func-ioctl
cec-func-poll
cec-ioc-adap-g-caps
cec-ioc-adap-g-log-addrs
cec-ioc-adap-g-phys-addr
cec-ioc-dqevent
cec-ioc-g-mode
cec-ioc-receive

31
Documentation/media/uapi/cec/cec-intro.rst Normal file
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@ -0,0 +1,31 @@
.. _cec-intro:
Introduction
============
Note: this documents the proposed CEC API. This API is not yet finalized
and is currently only available as a staging kernel module.
HDMI connectors provide a single pin for use by the Consumer Electronics
Control protocol. This protocol allows different devices connected by an
HDMI cable to communicate. The protocol for CEC version 1.4 is defined
in supplements 1 (CEC) and 2 (HEAC or HDMI Ethernet and Audio Return
Channel) of the HDMI 1.4a (:ref:`hdmi`) specification and the
extensions added to CEC version 2.0 are defined in chapter 11 of the
HDMI 2.0 (:ref:`hdmi2`) specification.
The bitrate is very slow (effectively no more than 36 bytes per second)
and is based on the ancient AV.link protocol used in old SCART
connectors. The protocol closely resembles a crazy Rube Goldberg
contraption and is an unholy mix of low and high level messages. Some
messages, especially those part of the HEAC protocol layered on top of
CEC, need to be handled by the kernel, others can be handled either by
the kernel or by userspace.
In addition, CEC can be implemented in HDMI receivers, transmitters and
in USB devices that have an HDMI input and an HDMI output and that
control just the CEC pin.
Drivers that support CEC will create a CEC device node (/dev/cecX) to
give userspace access to the CEC adapter. The
:ref:`CEC_ADAP_G_CAPS` ioctl will tell userspace what it is allowed to do.