cdb4af0fd5
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>
76 lines
2.1 KiB
ReStructuredText
76 lines
2.1 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _media-ioc-setup-link:
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**************************
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ioctl MEDIA_IOC_SETUP_LINK
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**************************
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*man MEDIA_IOC_SETUP_LINK(2)*
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Modify the properties of a link
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Synopsis
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========
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.. cpp:function:: int ioctl( int fd, int request, struct media_link_desc *argp )
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Arguments
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=========
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``fd``
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File descriptor returned by :ref:`open() <media-func-open>`.
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``request``
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MEDIA_IOC_SETUP_LINK
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``argp``
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Description
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===========
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To change link properties applications fill a struct
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:ref:`media_link_desc <media-link-desc>` with link identification
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information (source and sink pad) and the new requested link flags. They
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then call the MEDIA_IOC_SETUP_LINK ioctl with a pointer to that
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structure.
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The only configurable property is the ``ENABLED`` link flag to
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enable/disable a link. Links marked with the ``IMMUTABLE`` link flag can
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not be enabled or disabled.
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Link configuration has no side effect on other links. If an enabled link
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at the sink pad prevents the link from being enabled, the driver returns
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with an ``EBUSY`` error code.
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Only links marked with the ``DYNAMIC`` link flag can be enabled/disabled
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while streaming media data. Attempting to enable or disable a streaming
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non-dynamic link will return an ``EBUSY`` error code.
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If the specified link can't be found the driver returns with an ``EINVAL``
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error code.
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Return Value
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============
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On success 0 is returned, on error -1 and the ``errno`` variable is set
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appropriately. The generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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EINVAL
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The struct :ref:`media_link_desc <media-link-desc>` references a
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non-existing link, or the link is immutable and an attempt to modify
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its configuration was made.
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.. ------------------------------------------------------------------------------
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.. This file was automatically converted from DocBook-XML with the dbxml
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.. library (https://github.com/return42/sphkerneldoc). The origin XML comes
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.. from the linux kernel, refer to:
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..
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.. * https://github.com/torvalds/linux/tree/master/Documentation/DocBook
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.. ------------------------------------------------------------------------------
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