From 8e080c2e6cadada82a6b520e0c23a1cb974822d5 Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab@redhat.com>
Date: Sun, 13 Sep 2009 22:16:04 -0300
Subject: V4L/DVB (12761): DocBook: add media API specs

The V4L and DVB API's are there for a long time. however, up to now,
no efforts were done to merge them to kernel DocBook.

This patch adds the current versions of the specs as an unique compendium.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
 .../DocBook/v4l/vidioc-s-hw-freq-seek.xml          | 129 +++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 Documentation/DocBook/v4l/vidioc-s-hw-freq-seek.xml

(limited to 'Documentation/DocBook/v4l/vidioc-s-hw-freq-seek.xml')

diff --git a/Documentation/DocBook/v4l/vidioc-s-hw-freq-seek.xml b/Documentation/DocBook/v4l/vidioc-s-hw-freq-seek.xml
new file mode 100644
index 000000000000..14b3ec7ed75b
--- /dev/null
+++ b/Documentation/DocBook/v4l/vidioc-s-hw-freq-seek.xml
@@ -0,0 +1,129 @@
+<refentry id="vidioc-s-hw-freq-seek">
+  <refmeta>
+    <refentrytitle>ioctl VIDIOC_S_HW_FREQ_SEEK</refentrytitle>
+    &manvol;
+  </refmeta>
+
+  <refnamediv>
+    <refname>VIDIOC_S_HW_FREQ_SEEK</refname>
+    <refpurpose>Perform a hardware frequency seek</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 v4l2_hw_freq_seek
+*<parameter>argp</parameter></paramdef>
+      </funcprototype>
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Arguments</title>
+
+    <variablelist>
+      <varlistentry>
+	<term><parameter>fd</parameter></term>
+	<listitem>
+	  <para>&fd;</para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term><parameter>request</parameter></term>
+	<listitem>
+	  <para>VIDIOC_S_HW_FREQ_SEEK</para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term><parameter>argp</parameter></term>
+	<listitem>
+	  <para></para>
+	</listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para>Start a hardware frequency seek from the current frequency.
+To do this applications initialize the <structfield>tuner</structfield>,
+<structfield>type</structfield>, <structfield>seek_upward</structfield> and
+<structfield>wrap_around</structfield> fields, and zero out the
+<structfield>reserved</structfield> array of a &v4l2-hw-freq-seek; and
+call the <constant>VIDIOC_S_HW_FREQ_SEEK</constant> ioctl with a pointer
+to this structure.</para>
+
+    <para>This ioctl is supported if the <constant>V4L2_CAP_HW_FREQ_SEEK</constant> capability is set.</para>
+
+    <table pgwide="1" frame="none" id="v4l2-hw-freq-seek">
+      <title>struct <structname>v4l2_hw_freq_seek</structname></title>
+      <tgroup cols="3">
+	&cs-str;
+	<tbody valign="top">
+	  <row>
+	    <entry>__u32</entry>
+	    <entry><structfield>tuner</structfield></entry>
+	    <entry>The tuner index number. This is the
+same value as in the &v4l2-input; <structfield>tuner</structfield>
+field and the &v4l2-tuner; <structfield>index</structfield> field.</entry>
+	  </row>
+	  <row>
+	    <entry>&v4l2-tuner-type;</entry>
+	    <entry><structfield>type</structfield></entry>
+	    <entry>The tuner type. This is the same value as in the
+&v4l2-tuner; <structfield>type</structfield> field.</entry>
+	  </row>
+	  <row>
+	    <entry>__u32</entry>
+	    <entry><structfield>seek_upward</structfield></entry>
+	    <entry>If non-zero, seek upward from the current frequency, else seek downward.</entry>
+	  </row>
+	  <row>
+	    <entry>__u32</entry>
+	    <entry><structfield>wrap_around</structfield></entry>
+	    <entry>If non-zero, wrap around when at the end of the frequency range, else stop seeking.</entry>
+	  </row>
+	  <row>
+	    <entry>__u32</entry>
+	    <entry><structfield>reserved</structfield>[8]</entry>
+	    <entry>Reserved for future extensions. Drivers and
+	    applications must set the array to zero.</entry>
+	  </row>
+	</tbody>
+      </tgroup>
+    </table>
+  </refsect1>
+
+  <refsect1>
+    &return-value;
+
+    <variablelist>
+      <varlistentry>
+	<term><errorcode>EINVAL</errorcode></term>
+	<listitem>
+	  <para>The <structfield>tuner</structfield> index is out of
+bounds or the value in the <structfield>type</structfield> field is
+wrong.</para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term><errorcode>EAGAIN</errorcode></term>
+	<listitem>
+	  <para>The ioctl timed-out. Try again.</para>
+	</listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+</refentry>
+
+<!--
+Local Variables:
+mode: sgml
+sgml-parent-document: "v4l2.sgml"
+indent-tabs-mode: nil
+End:
+-->
-- 
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