mirror of
https://github.com/torvalds/linux.git
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8968da9b86
This patch touches on places where it shouldn't: image
files and code examples. Also, it doesn't fix all array
occurrences.
So, let's revert it.
This reverts commit ffbab694ed.
116 lines
2.5 KiB
ReStructuredText
116 lines
2.5 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _VIDIOC_SUBDEV_ENUM_MBUS_CODE:
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**********************************
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ioctl VIDIOC_SUBDEV_ENUM_MBUS_CODE
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**********************************
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Name
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====
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VIDIOC_SUBDEV_ENUM_MBUS_CODE - Enumerate media bus formats
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Synopsis
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========
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.. cpp:function:: int ioctl( int fd, int request, struct v4l2_subdev_mbus_code_enum * 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() <func-open>`.
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``request``
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VIDIOC_SUBDEV_ENUM_MBUS_CODE
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``argp``
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Description
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===========
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To enumerate media bus formats available at a given sub-device pad
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applications initialize the ``pad``, ``which`` and ``index`` fields of
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struct
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:ref:`v4l2_subdev_mbus_code_enum <v4l2-subdev-mbus-code-enum>` and
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call the :ref:`VIDIOC_SUBDEV_ENUM_MBUS_CODE` ioctl with a pointer to this
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structure. Drivers fill the rest of the structure or return an ``EINVAL``
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error code if either the ``pad`` or ``index`` are invalid. All media bus
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formats are enumerable by beginning at index zero and incrementing by
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one until ``EINVAL`` is returned.
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Available media bus formats may depend on the current 'try' formats at
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other pads of the sub-device, as well as on the current active links.
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See :ref:`VIDIOC_SUBDEV_G_FMT` for more
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information about the try formats.
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.. _v4l2-subdev-mbus-code-enum:
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.. flat-table:: struct v4l2_subdev_mbus_code_enum
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:header-rows: 0
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:stub-columns: 0
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:widths: 1 1 2
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- .. row 1
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- __u32
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- ``pad``
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- Pad number as reported by the media controller API.
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- .. row 2
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- __u32
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- ``index``
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- Number of the format in the enumeration, set by the application.
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- .. row 3
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- __u32
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- ``code``
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- The media bus format code, as defined in
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:ref:`v4l2-mbus-format`.
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- .. row 4
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- __u32
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- ``which``
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- Media bus format codes to be enumerated, from enum
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:ref:`v4l2_subdev_format_whence <v4l2-subdev-format-whence>`.
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- .. row 5
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- __u32
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- ``reserved``\ [8]
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- Reserved for future extensions. Applications and drivers must set
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the array to zero.
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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
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:ref:`v4l2_subdev_mbus_code_enum <v4l2-subdev-mbus-code-enum>`
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``pad`` references a non-existing pad, or the ``index`` field is out
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of bounds.
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