V4L/DVB: Documentation: update now that the vtx/videotext API has been removed

Remove all references to /dev/vtx in the documentation, except for
some historical comments in dev-teletext.xml.

Documentation/devices.txt is not updated, this will go through Alan Cox
who maintains this file.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 38 insertions, 25 deletions

diff --git a/Documentation/DocBook/v4l/compat.xml b/Documentation/DocBook/v4l/compat.xml
index 54447f0d078..c9ce61d981f 100644
--- a/Documentation/DocBook/v4l/compat.xml
+++ b/Documentation/DocBook/v4l/compat.xml
@@ -21,11 +21,15 @@ API.</para>
       <title>Opening and Closing Devices</title>
 
       <para>For compatibility reasons the character device file names
-recommended for V4L2 video capture, overlay, radio, teletext and raw
+recommended for V4L2 video capture, overlay, radio and raw
 vbi capture devices did not change from those used by V4L. They are
 listed in <xref linkend="devices" /> and below in <xref
           linkend="v4l-dev" />.</para>
 
+      <para>The teletext devices (minor range 192-223) have been removed in
+V4L2 and no longer exist. There is no hardware available anymore for handling
+pure teletext. Instead raw or sliced VBI is used.</para>
+
       <para>The V4L <filename>videodev</filename> module automatically
 assigns minor numbers to drivers in load order, depending on the
 registered device type. We recommend that V4L2 drivers by default
@@ -66,13 +70,6 @@ not compatible with V4L or V4L2.</para> </footnote>,
               <entry>64-127</entry>
             </row>
             <row>
-              <entry>Teletext decoder</entry>
-              <entry><para><filename>/dev/vtx</filename>,
-<filename>/dev/vtx0</filename> to
-<filename>/dev/vtx31</filename></para></entry>
-              <entry>192-223</entry>
-            </row>
-            <row>
               <entry>Raw VBI capture</entry>
               <entry><para><filename>/dev/vbi</filename>,
 <filename>/dev/vbi0</filename> to
@@ -2345,6 +2342,17 @@ more information.</para>
         </listitem>
       </orderedlist>
     </section>
+    <section>
+      <title>V4L2 in Linux 2.6.37</title>
+      <orderedlist>
+        <listitem>
+          <para>Remove the vtx (videotext/teletext) API. This API was no longer
+used and no hardware exists to verify the API. Nor were any userspace applications found
+that used it. It was originally scheduled for removal in 2.6.35.
+          </para>
+        </listitem>
+      </orderedlist>
+    </section>
 
     <section id="other">
       <title>Relation of V4L2 to other Linux multimedia APIs</title>
diff --git a/Documentation/DocBook/v4l/dev-teletext.xml b/Documentation/DocBook/v4l/dev-teletext.xml
index 76184e8ed61..414b1cfff9f 100644
--- a/Documentation/DocBook/v4l/dev-teletext.xml
+++ b/Documentation/DocBook/v4l/dev-teletext.xml
@@ -1,35 +1,32 @@
   <title>Teletext Interface</title>
 
-  <para>This interface aims at devices receiving and demodulating
+  <para>This interface was aimed at devices receiving and demodulating
 Teletext data [<xref linkend="ets300706" />, <xref linkend="itu653" />], evaluating the
 Teletext packages and storing formatted pages in cache memory. Such
 devices are usually implemented as microcontrollers with serial
-interface (I<superscript>2</superscript>C) and can be found on older
+interface (I<superscript>2</superscript>C) and could be found on old
 TV cards, dedicated Teletext decoding cards and home-brew devices
 connected to the PC parallel port.</para>
 
-  <para>The Teletext API was designed by Martin Buck. It is defined in
+  <para>The Teletext API was designed by Martin Buck. It was defined in
 the kernel header file <filename>linux/videotext.h</filename>, the
 specification is available from <ulink url="ftp://ftp.gwdg.de/pub/linux/misc/videotext/">
 ftp://ftp.gwdg.de/pub/linux/misc/videotext/</ulink>. (Videotext is the name of
-the German public television Teletext service.) Conventional character
-device file names are <filename>/dev/vtx</filename> and
-<filename>/dev/vttuner</filename>, with device number 83, 0 and 83, 16
-respectively. A similar interface exists for the Philips SAA5249
-Teletext decoder [specification?] with character device file names
-<filename>/dev/tlkN</filename>, device number 102, N.</para>
+the German public television Teletext service.)</para>
 
   <para>Eventually the Teletext API was integrated into the V4L API
 with character device file names <filename>/dev/vtx0</filename> to
 <filename>/dev/vtx31</filename>, device major number 81, minor numbers
-192 to 223. For reference the V4L Teletext API specification is
-reproduced here in full: "Teletext interfaces talk the existing VTX
-API." Teletext devices with major number 83 and 102 will be removed in
-Linux 2.6.</para>
+192 to 223.</para>
 
-  <para>There are no plans to replace the Teletext API or to integrate
-it into V4L2. Please write to the linux-media mailing list: &v4l-ml;
-when the need arises.</para>
+  <para>However, teletext decoders were quickly replaced by more
+generic VBI demodulators and those dedicated teletext decoders no longer exist.
+For many years the vtx devices were still around, even though nobody used
+them. So the decision was made to finally remove support for the Teletext API in
+kernel 2.6.37.</para>
+
+  <para>Modern devices all use the <link linkend="raw-vbi">raw</link> or
+<link linkend="sliced">sliced</link> VBI API.</para>
 
   <!--
 Local Variables:
diff --git a/Documentation/DocBook/v4l/v4l2.xml b/Documentation/DocBook/v4l/v4l2.xml
index 7c3c098d5d0..839e93e875a 100644
--- a/Documentation/DocBook/v4l/v4l2.xml
+++ b/Documentation/DocBook/v4l/v4l2.xml
@@ -99,6 +99,7 @@ Remote Controller chapter.</contrib>
       <year>2007</year>
       <year>2008</year>
       <year>2009</year>
+      <year>2010</year>
       <holder>Bill Dirks, Michael H. Schimek, Hans Verkuil, Martin
 Rubli, Andy Walls, Muralidharan Karicheri, Mauro Carvalho Chehab</holder>
     </copyright>
@@ -110,10 +111,17 @@ Rubli, Andy Walls, Muralidharan Karicheri, Mauro Carvalho Chehab</holder>
       <!-- Put document revisions here, newest first. -->
       <!-- API revisions (changes and additions of defines, enums,
 structs, ioctls) must be noted in more detail in the history chapter
-(compat.sgml), along with the possible impact on existing drivers and
+(compat.xml), along with the possible impact on existing drivers and
 applications. -->
 
       <revision>
+        <revnumber>2.6.37</revnumber>
+        <date>2010-08-06</date>
+        <authorinitials>hv</authorinitials>
+        <revremark>Removed obsolete vtx (videotext) API.</revremark>
+      </revision>
+
+      <revision>
         <revnumber>2.6.33</revnumber>
         <date>2009-12-03</date>
         <authorinitials>mk</authorinitials>