mirror of https://gitee.com/openkylin/linux.git
118 lines
2.5 KiB
ReStructuredText
118 lines
2.5 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
|
|
|
|
.. _VIDIOC_SUBDEV_ENUM_MBUS_CODE:
|
|
|
|
**********************************
|
|
ioctl VIDIOC_SUBDEV_ENUM_MBUS_CODE
|
|
**********************************
|
|
|
|
Name
|
|
====
|
|
|
|
VIDIOC_SUBDEV_ENUM_MBUS_CODE - Enumerate media bus formats
|
|
|
|
|
|
Synopsis
|
|
========
|
|
|
|
.. c:function:: int ioctl( int fd, int request, struct v4l2_subdev_mbus_code_enum * argp )
|
|
|
|
|
|
Arguments
|
|
=========
|
|
|
|
``fd``
|
|
File descriptor returned by :ref:`open() <func-open>`.
|
|
|
|
``request``
|
|
VIDIOC_SUBDEV_ENUM_MBUS_CODE
|
|
|
|
``argp``
|
|
|
|
|
|
Description
|
|
===========
|
|
|
|
To enumerate media bus formats available at a given sub-device pad
|
|
applications initialize the ``pad``, ``which`` and ``index`` fields of
|
|
struct
|
|
:ref:`v4l2_subdev_mbus_code_enum <v4l2-subdev-mbus-code-enum>` and
|
|
call the :ref:`VIDIOC_SUBDEV_ENUM_MBUS_CODE` ioctl with a pointer to this
|
|
structure. Drivers fill the rest of the structure or return an ``EINVAL``
|
|
error code if either the ``pad`` or ``index`` are invalid. All media bus
|
|
formats are enumerable by beginning at index zero and incrementing by
|
|
one until ``EINVAL`` is returned.
|
|
|
|
Available media bus formats may depend on the current 'try' formats at
|
|
other pads of the sub-device, as well as on the current active links.
|
|
See :ref:`VIDIOC_SUBDEV_G_FMT` for more
|
|
information about the try formats.
|
|
|
|
|
|
.. _v4l2-subdev-mbus-code-enum:
|
|
|
|
.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
|
|
|
|
.. flat-table:: struct v4l2_subdev_mbus_code_enum
|
|
:header-rows: 0
|
|
:stub-columns: 0
|
|
:widths: 1 1 2
|
|
|
|
|
|
- .. row 1
|
|
|
|
- __u32
|
|
|
|
- ``pad``
|
|
|
|
- Pad number as reported by the media controller API.
|
|
|
|
- .. row 2
|
|
|
|
- __u32
|
|
|
|
- ``index``
|
|
|
|
- Number of the format in the enumeration, set by the application.
|
|
|
|
- .. row 3
|
|
|
|
- __u32
|
|
|
|
- ``code``
|
|
|
|
- The media bus format code, as defined in
|
|
:ref:`v4l2-mbus-format`.
|
|
|
|
- .. row 4
|
|
|
|
- __u32
|
|
|
|
- ``which``
|
|
|
|
- Media bus format codes to be enumerated, from enum
|
|
:ref:`v4l2_subdev_format_whence <v4l2-subdev-format-whence>`.
|
|
|
|
- .. row 5
|
|
|
|
- __u32
|
|
|
|
- ``reserved``\ [8]
|
|
|
|
- Reserved for future extensions. Applications and drivers must set
|
|
the array to zero.
|
|
|
|
|
|
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.
|
|
|
|
EINVAL
|
|
The struct
|
|
:ref:`v4l2_subdev_mbus_code_enum <v4l2-subdev-mbus-code-enum>`
|
|
``pad`` references a non-existing pad, or the ``index`` field is out
|
|
of bounds.
|