From: Mauro Carvalho Chehab Date: Sat, 9 Jul 2016 14:20:46 +0000 (-0300) Subject: [media] doc-rst: make CEC look more like other parts of the book X-Git-Tag: v4.8-rc1~131^2^2~164 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=da98a79ba71fe62ae9f7581901df35ce0dc1be68;p=karo-tx-linux.git [media] doc-rst: make CEC look more like other parts of the book 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 --- diff --git a/Documentation/media/uapi/cec/cec-api.rst b/Documentation/media/uapi/cec/cec-api.rst index f40103fefddc..e7dc8253f1e2 100644 --- a/Documentation/media/uapi/cec/cec-api.rst +++ b/Documentation/media/uapi/cec/cec-api.rst @@ -10,65 +10,15 @@ CEC API .. _cec-api: -********************************* -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 -****************** - +This part describes the CEC: Consumer Electronics Control .. toctree:: :maxdepth: 1 + :numbered: + :caption: Table of Contents - 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 + cec-intro + cec-funcs cec-header diff --git a/Documentation/media/uapi/cec/cec-funcs.rst b/Documentation/media/uapi/cec/cec-funcs.rst new file mode 100644 index 000000000000..5b7630f2e076 --- /dev/null +++ b/Documentation/media/uapi/cec/cec-funcs.rst @@ -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 diff --git a/Documentation/media/uapi/cec/cec-intro.rst b/Documentation/media/uapi/cec/cec-intro.rst new file mode 100644 index 000000000000..d6a878866b3f --- /dev/null +++ b/Documentation/media/uapi/cec/cec-intro.rst @@ -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.