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doc-rst: Remove the media docbook
[mirror_ubuntu-zesty-kernel.git] / Documentation / DocBook / media / v4l / media-ioc-enum-links.xml
diff --git a/Documentation/DocBook/media/v4l/media-ioc-enum-links.xml b/Documentation/DocBook/media/v4l/media-ioc-enum-links.xml
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-<refentry id="media-ioc-enum-links">
-  <refmeta>
-    <refentrytitle>ioctl MEDIA_IOC_ENUM_LINKS</refentrytitle>
-    &manvol;
-  </refmeta>
-
-  <refnamediv>
-    <refname>MEDIA_IOC_ENUM_LINKS</refname>
-    <refpurpose>Enumerate all pads and links for a given entity</refpurpose>
-  </refnamediv>
-
-  <refsynopsisdiv>
-    <funcsynopsis>
-      <funcprototype>
-       <funcdef>int <function>ioctl</function></funcdef>
-       <paramdef>int <parameter>fd</parameter></paramdef>
-       <paramdef>int <parameter>request</parameter></paramdef>
-       <paramdef>struct media_links_enum *<parameter>argp</parameter></paramdef>
-      </funcprototype>
-    </funcsynopsis>
-  </refsynopsisdiv>
-
-  <refsect1>
-    <title>Arguments</title>
-
-    <variablelist>
-      <varlistentry>
-       <term><parameter>fd</parameter></term>
-       <listitem>
-         <para>File descriptor returned by
-         <link linkend='media-func-open'><function>open()</function></link>.</para>
-       </listitem>
-      </varlistentry>
-      <varlistentry>
-       <term><parameter>request</parameter></term>
-       <listitem>
-         <para>MEDIA_IOC_ENUM_LINKS</para>
-       </listitem>
-      </varlistentry>
-      <varlistentry>
-       <term><parameter>argp</parameter></term>
-       <listitem>
-         <para></para>
-       </listitem>
-      </varlistentry>
-    </variablelist>
-  </refsect1>
-
-  <refsect1>
-    <title>Description</title>
-
-    <para>To enumerate pads and/or links for a given entity, applications set
-    the entity field of a &media-links-enum; structure and initialize the
-    &media-pad-desc; and &media-link-desc; structure arrays pointed by the
-    <structfield>pads</structfield> and <structfield>links</structfield> fields.
-    They then call the MEDIA_IOC_ENUM_LINKS ioctl with a pointer to this
-    structure.</para>
-    <para>If the <structfield>pads</structfield> field is not NULL, the driver
-    fills the <structfield>pads</structfield> array with information about the
-    entity's pads. The array must have enough room to store all the entity's
-    pads. The number of pads can be retrieved with the &MEDIA-IOC-ENUM-ENTITIES;
-    ioctl.</para>
-    <para>If the <structfield>links</structfield> field is not NULL, the driver
-    fills the <structfield>links</structfield> array with information about the
-    entity's outbound links. The array must have enough room to store all the
-    entity's outbound links. The number of outbound links can be retrieved with
-    the &MEDIA-IOC-ENUM-ENTITIES; ioctl.</para>
-    <para>Only forward links that originate at one of the entity's source pads
-    are returned during the enumeration process.</para>
-
-    <table pgwide="1" frame="none" id="media-links-enum">
-      <title>struct <structname>media_links_enum</structname></title>
-      <tgroup cols="3">
-        &cs-str;
-       <tbody valign="top">
-         <row>
-           <entry>__u32</entry>
-           <entry><structfield>entity</structfield></entry>
-           <entry>Entity id, set by the application.</entry>
-         </row>
-         <row>
-           <entry>&media-pad-desc;</entry>
-           <entry>*<structfield>pads</structfield></entry>
-           <entry>Pointer to a pads array allocated by the application. Ignored
-           if NULL.</entry>
-         </row>
-         <row>
-           <entry>&media-link-desc;</entry>
-           <entry>*<structfield>links</structfield></entry>
-           <entry>Pointer to a links array allocated by the application. Ignored
-           if NULL.</entry>
-         </row>
-       </tbody>
-      </tgroup>
-    </table>
-
-    <table pgwide="1" frame="none" id="media-pad-desc">
-      <title>struct <structname>media_pad_desc</structname></title>
-      <tgroup cols="3">
-        &cs-str;
-       <tbody valign="top">
-         <row>
-           <entry>__u32</entry>
-           <entry><structfield>entity</structfield></entry>
-           <entry>ID of the entity this pad belongs to.</entry>
-         </row>
-         <row>
-           <entry>__u16</entry>
-           <entry><structfield>index</structfield></entry>
-           <entry>0-based pad index.</entry>
-         </row>
-         <row>
-           <entry>__u32</entry>
-           <entry><structfield>flags</structfield></entry>
-           <entry>Pad flags, see <xref linkend="media-pad-flag" /> for more details.</entry>
-         </row>
-       </tbody>
-      </tgroup>
-    </table>
-
-    <table pgwide="1" frame="none" id="media-link-desc">
-      <title>struct <structname>media_link_desc</structname></title>
-      <tgroup cols="3">
-        &cs-str;
-       <tbody valign="top">
-         <row>
-           <entry>&media-pad-desc;</entry>
-           <entry><structfield>source</structfield></entry>
-           <entry>Pad at the origin of this link.</entry>
-         </row>
-         <row>
-           <entry>&media-pad-desc;</entry>
-           <entry><structfield>sink</structfield></entry>
-           <entry>Pad at the target of this link.</entry>
-         </row>
-         <row>
-           <entry>__u32</entry>
-           <entry><structfield>flags</structfield></entry>
-           <entry>Link flags, see <xref linkend="media-link-flag" /> for more details.</entry>
-         </row>
-       </tbody>
-      </tgroup>
-    </table>
-
-  </refsect1>
-
-  <refsect1>
-    &return-value;
-
-    <variablelist>
-      <varlistentry>
-       <term><errorcode>EINVAL</errorcode></term>
-       <listitem>
-         <para>The &media-links-enum; <structfield>id</structfield> references
-         a non-existing entity.</para>
-       </listitem>
-      </varlistentry>
-    </variablelist>
-  </refsect1>
-</refentry>