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linux_old1/Documentation/media/uapi/v4l/vidioc-g-input.rst

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doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
.. -*- coding: utf-8; mode: rst -*-
doc-rst: linux_tv: Replace reference names to match ioctls Due to a limitation at the DocBook language, the references were using lowercase and slashes, instead of the name of the ioctls. On ReST, make them identical. This will hopefully help to cleanup the code a little bit. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-02 00:42:29 +08:00
.. _VIDIOC_G_INPUT:
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
************************************
ioctl VIDIOC_G_INPUT, VIDIOC_S_INPUT
************************************
doc-rst: linux_tv: don't use uppercases for syscall sections On the syscall conversions, we used uppercase for the sections, but this is too bold. So, convert them to Camel Case, as it looks visually better. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-06 02:14:35 +08:00
Name
doc-rst: linux_tv: reformat all syscall pages The syscall pages are written to be used also as man-pages. However, they don't match the format used by kernel-doc generated pages from DocBook. Rewrite them to match it. One side effect is that now all such pages at the book will have the same format, reducing the format differences between DVB and the other parts of the book. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-05 18:58:48 +08:00
====
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
doc-rst: linux_tv: reformat all syscall pages The syscall pages are written to be used also as man-pages. However, they don't match the format used by kernel-doc generated pages from DocBook. Rewrite them to match it. One side effect is that now all such pages at the book will have the same format, reducing the format differences between DVB and the other parts of the book. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-05 18:58:48 +08:00
VIDIOC_G_INPUT - VIDIOC_S_INPUT - Query or select the current video input
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
doc-rst: linux_tv: don't use uppercases for syscall sections On the syscall conversions, we used uppercase for the sections, but this is too bold. So, convert them to Camel Case, as it looks visually better. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-06 02:14:35 +08:00
Synopsis
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
========
doc-rst: linux_tv: supress lots of warnings The c language parser checks if there are duplicated object definitions. That causes lots of warnings like: WARNING: duplicate C object description of ioctl Let's remove those by telling Sphinx that the language for those objects are c++. The look of the descriptions will be close, and the warnings will be gone. Please notice that we had to keep a few of them as C, as the c++ parser seems to be broken when it finds an enum. Yet, this reduced from 219 warnings to 143, with is a good thing. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-02 20:49:16 +08:00
.. cpp:function:: int ioctl( int fd, int request, int *argp )
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
doc-rst: linux_tv: reformat all syscall pages The syscall pages are written to be used also as man-pages. However, they don't match the format used by kernel-doc generated pages from DocBook. Rewrite them to match it. One side effect is that now all such pages at the book will have the same format, reducing the format differences between DVB and the other parts of the book. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-05 18:58:48 +08:00
doc-rst: linux_tv: don't use uppercases for syscall sections On the syscall conversions, we used uppercase for the sections, but this is too bold. So, convert them to Camel Case, as it looks visually better. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-06 02:14:35 +08:00
Arguments
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
=========
``fd``
File descriptor returned by :ref:`open() <func-open>`.
``request``
VIDIOC_G_INPUT, VIDIOC_S_INPUT
``argp``
doc-rst: linux_tv: don't use uppercases for syscall sections On the syscall conversions, we used uppercase for the sections, but this is too bold. So, convert them to Camel Case, as it looks visually better. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-06 02:14:35 +08:00
Description
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
===========
To query the current video input applications call the
doc-rst: linux_tv: don't simplify VIDIOC_G_foo references As VIDIOC_G_foo is the reference used for VIDIOC_S_foo and VIDIOC_TRY_foo, we need to explicitly name the reference, as otherwise, it will mention the three ioctls altogether, with is not what we want. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-03 21:02:29 +08:00
:ref:`VIDIOC_G_INPUT <VIDIOC_G_INPUT>` ioctl with a pointer to an integer where the driver
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
stores the number of the input, as in the struct
:ref:`v4l2_input <v4l2-input>` ``index`` field. This ioctl will fail
doc-rst: linux_tv: Error codes should be const All error codes should be const. Most are, but there are lots of places where we forgot to add <constant> at the DocBook. Fix those via this small script: for i in $(git grep -lE "\s+E[A-Z]+\b" Documentation/linux_tv/); do perl -ne 's,([^\`])\b(E[A-Z]+)\b,\1``\2``,g; print $_' <$i >a && mv a $i; done As there are false positives, we needed to merge only the changes that make sense, skipping the c blocks and skipping things like EDID, EN, ETS that were also converted by the above code. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-03 22:53:09 +08:00
only when there are no video inputs, returning ``EINVAL``.
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
To select a video input applications store the number of the desired
doc-rst: linux_tv: convert lots of consts to references There were lots of consts at the media docbook that should be, instead, references. Convert the ones that can easily be done by an automatic script. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-02 01:33:56 +08:00
input in an integer and call the :ref:`VIDIOC_S_INPUT <VIDIOC_G_INPUT>` ioctl with a pointer
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
to this integer. Side effects are possible. For example inputs may
support different video standards, so the driver may implicitly switch
the current standard. Because of these possible side effects
applications must select an input before querying or negotiating any
other parameters.
Information about video inputs is available using the
doc-rst: linux_tv: simplify references There are lots of internal references in the form: :ref:`foo <foo>` Simplify them to be just: :ref:`foo`. Patch generated via this small script: for j in $(find . -name '*'); do echo $j; perl -ne 'if (m/\`(\S+)\s*\<(\S+)\>\`/) { if (!($1=~'http') && $1 eq $2) { s,\s*\<(\S+)\>,,; } } print $_' <$j >a && mv a $j; done Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-02 00:58:44 +08:00
:ref:`VIDIOC_ENUMINPUT` ioctl.
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
doc-rst: linux_tv: don't use uppercases for syscall sections On the syscall conversions, we used uppercase for the sections, but this is too bold. So, convert them to Camel Case, as it looks visually better. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-07-06 02:14:35 +08:00
Return Value
doc-rst: linux_tv DocBook to reST migration (docs-next) This is the restructuredText (reST) migration of the ``media`` DocBook-XML set from the linux_tv project. Signed-off-by: Markus Heiser <markus.heiser@darmarIT.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-06-30 21:18:56 +08:00
============
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.
EINVAL
The number of the video input is out of bounds.