[media] DocBook: Document MEDIA_IOC_G_TOPOLOGY

Add description for this new media controller ioctl.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/Documentation/DocBook/media/v4l/media-controller.xml b/Documentation/DocBook/media/v4l/media-controller.xml
index 63d48decaa6f1d5158a6c3620539eecc0e752a61..5f2fc07a93d72a0f45411cd27c6a0e6fd7125740 100644 (file)
--- a/Documentation/DocBook/media/v4l/media-controller.xml
+++ b/Documentation/DocBook/media/v4l/media-controller.xml
@@ -98,6 +98,7 @@
   &sub-media-func-ioctl;
   <!-- All ioctls go here. -->
   &sub-media-ioc-device-info;
+  &sub-media-ioc-g-topology;
   &sub-media-ioc-enum-entities;
   &sub-media-ioc-enum-links;
   &sub-media-ioc-setup-link;

diff --git a/Documentation/DocBook/media/v4l/media-ioc-g-topology.xml b/Documentation/DocBook/media/v4l/media-ioc-g-topology.xml
new file mode 100644 (file)
index 0000000..e0d49fa
--- /dev/null
+++ b/Documentation/DocBook/media/v4l/media-ioc-g-topology.xml
@@ -0,0 +1,391 @@
+<refentry id="media-g-topology">
+  <refmeta>
+    <refentrytitle>ioctl MEDIA_IOC_G_TOPOLOGY</refentrytitle>
+    &manvol;
+  </refmeta>
+
+  <refnamediv>
+    <refname>MEDIA_IOC_G_TOPOLOGY</refname>
+    <refpurpose>Enumerate the graph topology and graph element properties</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_v2_topology *<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_G_TOPOLOGY</para>
+       </listitem>
+      </varlistentry>
+      <varlistentry>
+       <term><parameter>argp</parameter></term>
+       <listitem>
+         <para></para>
+       </listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>Description</title>
+    <para>The typical usage of this ioctl is to call it twice.
+    On the first call, the structure defined at &media-v2-topology; should
+    be zeroed. At return, if no errors happen, this ioctl will return the
+    <constant>topology_version</constant> and the total number of entities,
+    interfaces, pads and links.</para>
+    <para>Before the second call, the userspace should allocate arrays to
+    store the graph elements that are desired, putting the pointers to them
+    at the ptr_entities, ptr_interfaces, ptr_links and/or ptr_pads, keeping
+    the other values untouched.</para>
+    <para>If the <constant>topology_version</constant> remains the same, the
+    ioctl should fill the desired arrays with the media graph elements.</para>
+
+    <table pgwide="1" frame="none" id="media-v2-topology">
+      <title>struct <structname>media_v2_topology</structname></title>
+      <tgroup cols="5">
+       <colspec colname="c1" />
+       <colspec colname="c2" />
+       <colspec colname="c3" />
+       <colspec colname="c4" />
+       <colspec colname="c5" />
+       <tbody valign="top">
+         <row>
+           <entry>__u64</entry>
+           <entry><structfield>topology_version</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Version of the media graph topology. When the graph is
+                   created, this field starts with zero. Every time a graph
+                   element is added or removed, this field is
+                   incremented.</entry>
+         </row>
+         <row>
+           <entry>__u64</entry>
+           <entry><structfield>num_entities</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Number of entities in the graph</entry>
+         </row>
+         <row>
+           <entry>__u64</entry>
+           <entry><structfield>ptr_entities</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>A pointer to a memory area where the entities array
+                  will be stored, converted to a 64-bits integer.
+                  It can be zero. if zero, the ioctl won't store the
+                  entities. It will just update
+                  <constant>num_entities</constant></entry>
+         </row>
+         <row>
+           <entry>__u64</entry>
+           <entry><structfield>num_interfaces</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Number of interfaces in the graph</entry>
+         </row>
+         <row>
+           <entry>__u64</entry>
+           <entry><structfield>ptr_interfaces</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>A pointer to a memory area where the interfaces array
+                  will be stored, converted to a 64-bits integer.
+                  It can be zero. if zero, the ioctl won't store the
+                  interfaces. It will just update
+                  <constant>num_interfaces</constant></entry>
+         </row>
+         <row>
+           <entry>__u64</entry>
+           <entry><structfield>num_pads</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Total number of pads in the graph</entry>
+         </row>
+         <row>
+           <entry>__u64</entry>
+           <entry><structfield>ptr_pads</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>A pointer to a memory area where the pads array
+                  will be stored, converted to a 64-bits integer.
+                  It can be zero. if zero, the ioctl won't store the
+                  pads. It will just update
+                  <constant>num_pads</constant></entry>
+         </row>
+         <row>
+           <entry>__u64</entry>
+           <entry><structfield>num_links</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Total number of data and interface links in the graph</entry>
+         </row>
+         <row>
+           <entry>__u64</entry>
+           <entry><structfield>ptr_links</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>A pointer to a memory area where the links array
+                  will be stored, converted to a 64-bits integer.
+                  It can be zero. if zero, the ioctl won't store the
+                  links. It will just update
+                  <constant>num_links</constant></entry>
+         </row>
+       </tbody>
+      </tgroup>
+    </table>
+
+    <table pgwide="1" frame="none" id="media-v2-entity">
+      <title>struct <structname>media_v2_entity</structname></title>
+      <tgroup cols="5">
+       <colspec colname="c1" />
+       <colspec colname="c2" />
+       <colspec colname="c3" />
+       <colspec colname="c4" />
+       <colspec colname="c5" />
+       <tbody valign="top">
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>id</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Unique ID for the entity.</entry>
+         </row>
+         <row>
+           <entry>char</entry>
+           <entry><structfield>name</structfield>[64]</entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Entity name as an UTF-8 NULL-terminated string.</entry>
+         </row>
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>function</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Entity main function, see <xref linkend="media-entity-type" /> for details.</entry>
+         </row>
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>reserved</structfield>[12]</entry>
+           <entry>Reserved for future extensions. Drivers and applications must
+           set this array to zero.</entry>
+         </row>
+       </tbody>
+      </tgroup>
+    </table>
+
+    <table pgwide="1" frame="none" id="media-v2-interface">
+      <title>struct <structname>media_v2_interface</structname></title>
+      <tgroup cols="5">
+       <colspec colname="c1" />
+       <colspec colname="c2" />
+       <colspec colname="c3" />
+       <colspec colname="c4" />
+       <colspec colname="c5" />
+       <tbody valign="top">
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>id</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Unique ID for the interface.</entry>
+         </row>
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>intf_type</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Interface type, see <xref linkend="media-intf-type" /> for details.</entry>
+         </row>
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>flags</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Interface flags. Currently unused.</entry>
+         </row>
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>reserved</structfield>[9]</entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Reserved for future extensions. Drivers and applications must
+           set this array to zero.</entry>
+         </row>
+         <row>
+           <entry>struct media_v2_intf_devnode</entry>
+           <entry><structfield>devnode</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Used only for device node interfaces. See <xref linkend="media-v2-intf-devnode" /> for details..</entry>
+         </row>
+       </tbody>
+      </tgroup>
+    </table>
+
+    <table pgwide="1" frame="none" id="media-v2-intf-devnode">
+      <title>struct <structname>media_v2_interface</structname></title>
+      <tgroup cols="5">
+       <colspec colname="c1" />
+       <colspec colname="c2" />
+       <colspec colname="c3" />
+       <colspec colname="c4" />
+       <colspec colname="c5" />
+       <tbody valign="top">
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>major</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Device node major number.</entry>
+         </row>
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>minor</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Device node minor number.</entry>
+         </row>
+       </tbody>
+      </tgroup>
+    </table>
+
+    <table pgwide="1" frame="none" id="media-v2-pad">
+      <title>struct <structname>media_v2_pad</structname></title>
+      <tgroup cols="5">
+       <colspec colname="c1" />
+       <colspec colname="c2" />
+       <colspec colname="c3" />
+       <colspec colname="c4" />
+       <colspec colname="c5" />
+       <tbody valign="top">
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>id</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Unique ID for the pad.</entry>
+         </row>
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>entity_id</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Unique ID for the entity where this pad belongs.</entry>
+         </row>
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>flags</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Pad flags, see <xref linkend="media-pad-flag" /> for more details.</entry>
+         </row>
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>reserved</structfield>[9]</entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Reserved for future extensions. Drivers and applications must
+           set this array to zero.</entry>
+         </row>
+       </tbody>
+      </tgroup>
+    </table>
+
+    <table pgwide="1" frame="none" id="media-v2-link">
+      <title>struct <structname>media_v2_pad</structname></title>
+      <tgroup cols="5">
+       <colspec colname="c1" />
+       <colspec colname="c2" />
+       <colspec colname="c3" />
+       <colspec colname="c4" />
+       <colspec colname="c5" />
+       <tbody valign="top">
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>id</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Unique ID for the pad.</entry>
+         </row>
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>source_id</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>
+              <para>On pad to pad links: unique ID for the source pad.</para>
+              <para>On interface to entity links: unique ID for the interface.</para>
+           </entry>
+         </row>
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>sink_id</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>
+              <para>On pad to pad links: unique ID for the sink pad.</para>
+              <para>On interface to entity links: unique ID for the entity.</para>
+           </entry>
+         </row>
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>flags</structfield></entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Link flags, see <xref linkend="media-link-flag" /> for more details.</entry>
+         </row>
+         <row>
+           <entry>__u32</entry>
+           <entry><structfield>reserved</structfield>[5]</entry>
+           <entry></entry>
+           <entry></entry>
+           <entry>Reserved for future extensions. Drivers and applications must
+           set this array to zero.</entry>
+         </row>
+       </tbody>
+      </tgroup>
+    </table>
+
+  </refsect1>
+
+  <refsect1>
+    &return-value;
+
+    <variablelist>
+      <varlistentry>
+       <term><errorcode>ENOSPC</errorcode></term>
+       <listitem>
+         <para>This is returned when either one or more of the num_entities,
+         num_interfaces, num_links or num_pads are non-zero and are smaller
+         than the actual number of elements inside the graph. This may happen
+         if the <constant>topology_version</constant> changed when compared
+         to the last time this ioctl was called. Userspace should usually
+         free the area for the pointers, zero the struct elements and call
+         this ioctl again.</para>
+       </listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+</refentry>