[media] DocBook: better document FE_SET_TONE ioctl

Use the proper format for FE_SET_TONE documentation and
improve the documentation.

Keep the enum fe_sec_tone_mode description together with
the ioctl, as both are used together.

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

Documentation/DocBook/media/dvb/fe-set-tone.xml

···
+<refentry id="FE_SET_TONE">
+  <refmeta>
+    <refentrytitle>ioctl FE_SET_TONE</refentrytitle>
+    &manvol;
+  </refmeta>
+
+  <refnamediv>
+    <refname>FE_SET_TONE</refname>
+    <refpurpose>Sets/resets the generation of the continuous 22kHz tone.</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcprototype>
+	<funcdef>int <function>ioctl</function></funcdef>
+	<paramdef>int <parameter>fd</parameter></paramdef>
+	<paramdef>int <parameter>request</parameter></paramdef>
+	<paramdef>&fe-sec-tone-mode; *<parameter>tone</parameter></paramdef>
+      </funcprototype>
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Arguments</title>
+        <variablelist>
+      <varlistentry>
+	<term><parameter>fd</parameter></term>
+	<listitem>
+	  <para>&fe_fd;</para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term><parameter>request</parameter></term>
+	<listitem>
+	  <para>FE_SET_TONE</para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term><parameter>pointer to &fe-sec-tone-mode;</parameter></term>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>Description</title>
+
+<para>This ioctl is used to set the generation of the continuous 22kHz tone.
+    This call requires read/write permissions.</para>
+<para>Usually, satellital antenna subsystems require that the digital TV
+    device to send a 22kHz tone in order to select between high/low band on
+    some dual-band LNBf. It is also used to send signals to DiSEqC equipment,
+    but this is done using the DiSEqC ioctls.</para>
+<para>NOTE: if more than one device is connected to the same antenna,
+    setting a tone may interfere on other devices, as they may lose
+    the capability of selecting the band. So, it is recommended that
+    applications would change to SEC_TONE_OFF when the device is not used.</para>
+
+&return-value-dvb;
+</refsect1>
+
+<section id="fe-sec-tone-mode-t">
+<title>enum fe_sec_voltage</title>
+
+<table pgwide="1" frame="none" id="fe-sec-tone-mode">
+    <title>enum fe_sec_tone_mode</title>
+    <tgroup cols="2">
+	&cs-def;
+	<thead>
+	<row>
+	    <entry>ID</entry>
+	    <entry>Description</entry>
+	</row>
+	</thead>
+	<tbody valign="top">
+	<row>
+	    <entry align="char">SEC_TONE_ON</entry>
+	    <entry align="char">Sends a 22kHz tone burst to the antenna</entry>
+	</row><row>
+	    <entry align="char">SEC_TONE_OFF</entry>
+	    <entry align="char">Don't send a 22kHz tone to the antenna
+		(except if the FE_DISEQC_* ioctls are called)</entry>
+	</row>
+        </tbody>
+    </tgroup>
+</table>
+</section>
+
+</refentry>

Documentation/DocBook/media/dvb/frontend.xml

···
 </programlisting>
 </section>
 
-<section id="fe-sec-tone-mode-t">
-<title>SEC continuous tone</title>
-
-<para>The continuous 22KHz tone is usually used with non-DiSEqC capable LNBs to switch the
-high/low band of a dual-band LNB. When using DiSEqC epuipment this voltage has to
-be switched consistently to the DiSEqC commands as described in the DiSEqC
-spec.</para>
-<programlisting>
-	typedef enum fe_sec_tone_mode {
-	SEC_TONE_ON,
-	SEC_TONE_OFF
-	} fe_sec_tone_mode_t;
-</programlisting>
-</section>
-
 <section id="fe-sec-mini-cmd-t">
 <title>SEC tone burst</title>
 
···
 &return-value-dvb;
 </section>
 
-<section id="FE_SET_TONE">
-<title>FE_SET_TONE</title>
-<para>DESCRIPTION
-</para>
-<informaltable><tgroup cols="1"><tbody><row><entry
- align="char">
-<para>This call is used to set the generation of the continuous 22kHz tone. This call
- requires read/write permissions.</para>
-</entry>
- </row></tbody></tgroup></informaltable>
-<para>SYNOPSIS
-</para>
-<informaltable><tgroup cols="1"><tbody><row><entry
- align="char">
-<para>int ioctl(int fd, int request = <link linkend="FE_SET_TONE">FE_SET_TONE</link>,
- fe_sec_tone_mode_t tone);</para>
-</entry>
- </row></tbody></tgroup></informaltable>
-<para>PARAMETERS
-</para>
-<informaltable><tgroup cols="2"><tbody><row><entry
- align="char">
-<para>int fd</para>
-</entry><entry
- align="char">
-<para>File descriptor returned by a previous call to open().</para>
-</entry>
- </row><row><entry
- align="char">
-<para>int request</para>
-</entry><entry
- align="char">
-<para>Equals <link linkend="FE_SET_TONE">FE_SET_TONE</link> for this command.</para>
-</entry>
- </row><row><entry
- align="char">
-<para>fe_sec_tone_mode_t
- tone</para>
-</entry><entry
- align="char">
-<para>The requested tone generation mode (on/off).</para>
-</entry>
- </row></tbody></tgroup></informaltable>
-&return-value-dvb;
-</section>
 
+&sub-fe-set-tone;
 &sub-fe-set-voltage;
 &sub-fe-enable-high-lnb-voltage;
 &sub-fe-set-frontend-tune-mode;

include/uapi/linux/dvb/frontend.h

···
 typedef enum fe_sec_voltage fe_sec_voltage_t;
 
 
-typedef enum fe_sec_tone_mode {
+enum fe_sec_tone_mode {
 	SEC_TONE_ON,
 	SEC_TONE_OFF
-} fe_sec_tone_mode_t;
+};
+
+typedef enum fe_sec_tone_mode fe_sec_tone_mode_t;
 
 
 typedef enum fe_sec_mini_cmd {