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Diffstat (limited to 'Documentation/DocBook/v4l/vidioc-subdev-enum-mbus-code.xml')
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1 files changed, 119 insertions, 0 deletions
diff --git a/Documentation/DocBook/v4l/vidioc-subdev-enum-mbus-code.xml b/Documentation/DocBook/v4l/vidioc-subdev-enum-mbus-code.xml new file mode 100644 index 000000000000..a6b3432449f6 --- /dev/null +++ b/Documentation/DocBook/v4l/vidioc-subdev-enum-mbus-code.xml | |||
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1 | <refentry id="vidioc-subdev-enum-mbus-code"> | ||
2 | <refmeta> | ||
3 | <refentrytitle>ioctl VIDIOC_SUBDEV_ENUM_MBUS_CODE</refentrytitle> | ||
4 | &manvol; | ||
5 | </refmeta> | ||
6 | |||
7 | <refnamediv> | ||
8 | <refname>VIDIOC_SUBDEV_ENUM_MBUS_CODE</refname> | ||
9 | <refpurpose>Enumerate media bus formats</refpurpose> | ||
10 | </refnamediv> | ||
11 | |||
12 | <refsynopsisdiv> | ||
13 | <funcsynopsis> | ||
14 | <funcprototype> | ||
15 | <funcdef>int <function>ioctl</function></funcdef> | ||
16 | <paramdef>int <parameter>fd</parameter></paramdef> | ||
17 | <paramdef>int <parameter>request</parameter></paramdef> | ||
18 | <paramdef>struct v4l2_subdev_mbus_code_enum * | ||
19 | <parameter>argp</parameter></paramdef> | ||
20 | </funcprototype> | ||
21 | </funcsynopsis> | ||
22 | </refsynopsisdiv> | ||
23 | |||
24 | <refsect1> | ||
25 | <title>Arguments</title> | ||
26 | |||
27 | <variablelist> | ||
28 | <varlistentry> | ||
29 | <term><parameter>fd</parameter></term> | ||
30 | <listitem> | ||
31 | <para>&fd;</para> | ||
32 | </listitem> | ||
33 | </varlistentry> | ||
34 | <varlistentry> | ||
35 | <term><parameter>request</parameter></term> | ||
36 | <listitem> | ||
37 | <para>VIDIOC_SUBDEV_ENUM_MBUS_CODE</para> | ||
38 | </listitem> | ||
39 | </varlistentry> | ||
40 | <varlistentry> | ||
41 | <term><parameter>argp</parameter></term> | ||
42 | <listitem> | ||
43 | <para></para> | ||
44 | </listitem> | ||
45 | </varlistentry> | ||
46 | </variablelist> | ||
47 | </refsect1> | ||
48 | |||
49 | <refsect1> | ||
50 | <title>Description</title> | ||
51 | |||
52 | <note> | ||
53 | <title>Experimental</title> | ||
54 | <para>This is an <link linkend="experimental">experimental</link> | ||
55 | interface and may change in the future.</para> | ||
56 | </note> | ||
57 | |||
58 | <para>To enumerate media bus formats available at a given sub-device pad | ||
59 | applications initialize the <structfield>pad</structfield> and | ||
60 | <structfield>index</structfield> fields of &v4l2-subdev-mbus-code-enum; and | ||
61 | call the <constant>VIDIOC_SUBDEV_ENUM_MBUS_CODE</constant> ioctl with a | ||
62 | pointer to this structure. Drivers fill the rest of the structure or return | ||
63 | an &EINVAL; if either the <structfield>pad</structfield> or | ||
64 | <structfield>index</structfield> are invalid. All media bus formats are | ||
65 | enumerable by beginning at index zero and incrementing by one until | ||
66 | <errorcode>EINVAL</errorcode> is returned.</para> | ||
67 | |||
68 | <para>Available media bus formats may depend on the current 'try' formats | ||
69 | at other pads of the sub-device, as well as on the current active links. See | ||
70 | &VIDIOC-SUBDEV-G-FMT; for more information about the try formats.</para> | ||
71 | |||
72 | <table pgwide="1" frame="none" id="v4l2-subdev-mbus-code-enum"> | ||
73 | <title>struct <structname>v4l2_subdev_mbus_code_enum</structname></title> | ||
74 | <tgroup cols="3"> | ||
75 | &cs-str; | ||
76 | <tbody valign="top"> | ||
77 | <row> | ||
78 | <entry>__u32</entry> | ||
79 | <entry><structfield>pad</structfield></entry> | ||
80 | <entry>Pad number as reported by the media controller API.</entry> | ||
81 | </row> | ||
82 | <row> | ||
83 | <entry>__u32</entry> | ||
84 | <entry><structfield>index</structfield></entry> | ||
85 | <entry>Number of the format in the enumeration, set by the | ||
86 | application.</entry> | ||
87 | </row> | ||
88 | <row> | ||
89 | <entry>__u32</entry> | ||
90 | <entry><structfield>code</structfield></entry> | ||
91 | <entry>The media bus format code, as defined in | ||
92 | <xref linkend="v4l2-mbus-format" />.</entry> | ||
93 | </row> | ||
94 | <row> | ||
95 | <entry>__u32</entry> | ||
96 | <entry><structfield>reserved</structfield>[9]</entry> | ||
97 | <entry>Reserved for future extensions. Applications and drivers must | ||
98 | set the array to zero.</entry> | ||
99 | </row> | ||
100 | </tbody> | ||
101 | </tgroup> | ||
102 | </table> | ||
103 | </refsect1> | ||
104 | |||
105 | <refsect1> | ||
106 | &return-value; | ||
107 | |||
108 | <variablelist> | ||
109 | <varlistentry> | ||
110 | <term><errorcode>EINVAL</errorcode></term> | ||
111 | <listitem> | ||
112 | <para>The &v4l2-subdev-mbus-code-enum; <structfield>pad</structfield> | ||
113 | references a non-existing pad, or the <structfield>index</structfield> | ||
114 | field is out of bounds.</para> | ||
115 | </listitem> | ||
116 | </varlistentry> | ||
117 | </variablelist> | ||
118 | </refsect1> | ||
119 | </refentry> | ||