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Message-ID: <1334701027-19159-4-git-send-email-manjunatha_halli@ti.com>
Date: Tue, 17 Apr 2012 17:17:06 -0500
From: <manjunatha_halli@...com>
To: <linux-media@...r.kernel.org>
CC: <benzyg@...com>, <linux-kernel@...r.kernel.org>,
Manjunatha Halli <x0130808@...com>
Subject: [PATCH 3/4] [Documentation] Add documentation for V4L2 FM new features,
From: Manjunatha Halli <x0130808@...com>
The list of new features -
1) New control class for FM RX
2) New FM RX CID's - De-Emphasis filter mode and RDS AF switch
3) New FM TX CID - RDS Alternate frequency set.
Signed-off-by: Manjunatha Halli <x0130808@...com>
---
Documentation/DocBook/media/v4l/compat.xml | 3 +
Documentation/DocBook/media/v4l/controls.xml | 78 ++++++++++++++++++++
Documentation/DocBook/media/v4l/dev-rds.xml | 5 +-
.../DocBook/media/v4l/vidioc-g-ext-ctrls.xml | 7 ++
4 files changed, 91 insertions(+), 2 deletions(-)
diff --git a/Documentation/DocBook/media/v4l/compat.xml b/Documentation/DocBook/media/v4l/compat.xml
index bce97c5..df1f345 100644
--- a/Documentation/DocBook/media/v4l/compat.xml
+++ b/Documentation/DocBook/media/v4l/compat.xml
@@ -2311,6 +2311,9 @@ more information.</para>
<para>Added FM Modulator (FM TX) Extended Control Class: <constant>V4L2_CTRL_CLASS_FM_TX</constant> and their Control IDs.</para>
</listitem>
<listitem>
+ <para>Added FM Receiver (FM RX) Extended Control Class: <constant>V4L2_CTRL_CLASS_FM_RX</constant> and their Control IDs.</para>
+ </listitem>
+ <listitem>
<para>Added Remote Controller chapter, describing the default Remote Controller mapping for media devices.</para>
</listitem>
</orderedlist>
diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml
index b84f25e..f6c8034 100644
--- a/Documentation/DocBook/media/v4l/controls.xml
+++ b/Documentation/DocBook/media/v4l/controls.xml
@@ -3018,6 +3018,12 @@ to find receivers which can scroll strings sized as 32 x N or 64 x N characters.
with steps of 32 or 64 characters. The result is it must always contain a string with size multiple of 32 or 64. </entry>
</row>
<row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_AF_FREQ</constant> </entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Sets the RDS Alternate Frequency value which allows a receiver to re-tune to a different frequency providing the same station when the first signal becomes too weak (e.g., when moving out of range). </entry>
+ </row>
+ <row>
<entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_ENABLED</constant> </entry>
<entry>boolean</entry>
</row>
@@ -3146,6 +3152,78 @@ manually or automatically if set to zero. Unit, range and step are driver-specif
<xref linkend="en50067" /> document, from CENELEC.</para>
</section>
+ <section id="fm-rx-controls">
+ <title>FM Receiver Control Reference</title>
+
+ <para>The FM Receiver (FM_RX) class includes controls for common features of
+FM Reception capable devices. Currently this class includes parameter for Alternate
+frequency.</para>
+
+ <table pgwide="1" frame="none" id="fm-rx-control-id">
+ <title>FM_RX Control IDs</title>
+
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FM_RX_CLASS</constant> </entry>
+ <entry>class</entry>
+ </row><row><entry spanname="descr">The FM_RX class
+descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
+description of this control class.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_AF_SWITCH</constant> </entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Enable or Disable's FM RX RDS Alternate frequency feature.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TUNE_DEEMPHASIS</constant> </entry>
+ <entry>integer</entry>
+ </row>
+ <row id="v4l2-deemphasis"><entry spanname="descr">Configures the de-emphasis value for reception.
+A pre-emphasis filter is applied to the broadcast to accentuate the high audio frequencies.
+Depending on the region, a time constant of either 50 or 75 useconds is used. The enum v4l2_deemphasis
+defines possible values for pre-emphasis. Here they are:</entry>
+ </row><row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_DEEMPHASIS_DISABLED</constant> </entry>
+ <entry>No de-emphasis is applied.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_DEEMPHASIS_50_uS</constant> </entry>
+ <entry>A de-emphasis of 50 uS is used.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_DEEMPHASIS_75_uS</constant> </entry>
+ <entry>A de-emphasis of 75 uS is used.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+
+ </row>
+ <row><entry></entry></row>
+ </tbody>
+ </tgroup>
+ </table>
+
+ </section>
<section id="flash-controls">
<title>Flash Control Reference</title>
diff --git a/Documentation/DocBook/media/v4l/dev-rds.xml b/Documentation/DocBook/media/v4l/dev-rds.xml
index 38883a4..8188161 100644
--- a/Documentation/DocBook/media/v4l/dev-rds.xml
+++ b/Documentation/DocBook/media/v4l/dev-rds.xml
@@ -55,8 +55,9 @@ If the driver only passes RDS blocks without interpreting the data
the <constant>V4L2_TUNER_CAP_RDS_BLOCK_IO</constant> flag has to be set. If the
tuner is capable of handling RDS entities like program identification codes and radio
text, the flag <constant>V4L2_TUNER_CAP_RDS_CONTROLS</constant> should be set,
-see <link linkend="writing-rds-data">Writing RDS data</link> and
-<link linkend="fm-tx-controls">FM Transmitter Control Reference</link>.</para>
+see <link linkend="writing-rds-data">Writing RDS data</link>,
+<link linkend="fm-tx-controls">FM Transmitter Control Reference</link>
+<link linkend="fm-rx-controls">FM Receiver Control Reference</link>.</para>
</section>
<section id="reading-rds-data">
diff --git a/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml b/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml
index b17a7aa..2a8b44e 100644
--- a/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml
@@ -258,6 +258,13 @@ These controls are described in <xref
These controls are described in <xref
linkend="fm-tx-controls" />.</entry>
</row>
+ <row>
+ <entry><constant>V4L2_CTRL_CLASS_FM_RX</constant></entry>
+ <entry>0x9c0000</entry>
+ <entry>The class containing FM Receiver (FM RX) controls.
+These controls are described in <xref
+ linkend="fm-rx-controls" />.</entry>
+ </row>
<row>
<entry><constant>V4L2_CTRL_CLASS_FLASH</constant></entry>
<entry>0x9c0000</entry>
--
1.7.4.1
--
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