diff options
author | Markus Heiser <markus.heiser@darmarIT.de> | 2016-07-08 20:55:42 +0200 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-08 17:38:55 -0300 |
commit | e2460b1d579a6ea4f90cf2915da87b16b59e0082 (patch) | |
tree | 383cd21dd61326dfef365523fef358e3e3300604 /Documentation/media/uapi/cec/cec-func-ioctl.rst | |
parent | 4606ce43929a0a13443d691f53928ac58b002742 (diff) |
[media] doc-rst: linux_tv CEC part, DocBook to reST migration
This is the reST migration of media's CEC part. The migration is based
on media_tree's cec branch:
https://git.linuxtv.org/media_tree.git
c7169ad * cec media_tree/cec [media] DocBook/media: add CEC documentation
Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'Documentation/media/uapi/cec/cec-func-ioctl.rst')
-rw-r--r-- | Documentation/media/uapi/cec/cec-func-ioctl.rst | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/Documentation/media/uapi/cec/cec-func-ioctl.rst b/Documentation/media/uapi/cec/cec-func-ioctl.rst new file mode 100644 index 000000000000..9d37591e3ef4 --- /dev/null +++ b/Documentation/media/uapi/cec/cec-func-ioctl.rst @@ -0,0 +1,77 @@ +.. -*- coding: utf-8; mode: rst -*- + +.. _cec-func-ioctl: + +*********** +cec ioctl() +*********** + +*man cec-ioctl(2)* + +Control a cec device + + +Synopsis +======== + +.. code-block:: c + + #include <sys/ioctl.h> + + +.. c:function:: int ioctl( int fd, int request, void *argp ) + +Arguments +========= + +``fd`` + File descriptor returned by :ref:`open() <func-open>`. + +``request`` + CEC ioctl request code as defined in the cec.h header file, for + example CEC_ADAP_G_CAPS. + +``argp`` + Pointer to a request-specific structure. + + +Description +=========== + +Note: this documents the proposed CEC API. This API is not yet finalized +and is currently only available as a staging kernel module. + +The :c:func:`ioctl()` function manipulates cec device parameters. The +argument ``fd`` must be an open file descriptor. + +The ioctl ``request`` code specifies the cec function to be called. It +has encoded in it whether the argument is an input, output or read/write +parameter, and the size of the argument ``argp`` in bytes. + +Macros and structures definitions specifying cec ioctl requests and +their parameters are located in the cec.h header file. All cec ioctl +requests, their respective function and parameters are specified in +:ref:`cec-user-func`. + + +Return Value +============ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + +Request-specific error codes are listed in the individual requests +descriptions. + +When an ioctl that takes an output or read/write parameter fails, the +parameter remains unmodified. + + +.. ------------------------------------------------------------------------------ +.. This file was automatically converted from DocBook-XML with the dbxml +.. library (https://github.com/return42/sphkerneldoc). The origin XML comes +.. from the linux kernel, refer to: +.. +.. * https://github.com/torvalds/linux/tree/master/Documentation/DocBook +.. ------------------------------------------------------------------------------ |