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authorAndrey Smirnov <andrew.smirnov@gmail.com>2013-03-26 22:47:24 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-03-29 09:23:58 -0300
commitb4e96a7e9f9511d1b57a10a08cd10af6e517966b (patch)
tree16a2dffca50658d9cd3dbe840d7f33765fbf9340 /Documentation/DocBook/media/v4l/controls.xml
parentaec330a8cbd373d78c327201ec28fd5f252f3846 (diff)
downloadop-kernel-dev-b4e96a7e9f9511d1b57a10a08cd10af6e517966b.zip
op-kernel-dev-b4e96a7e9f9511d1b57a10a08cd10af6e517966b.tar.gz
[media] v4l2: Add documentation for the FM RX controls
Add appropriate documentation for all the newly added standard controls. Based on the patch by Manjunatha Halli [1] [1] http://lists-archives.com/linux-kernel/27641303-media-update-docs-for-v4l2-fm-new-features.html Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/DocBook/media/v4l/controls.xml')
-rw-r--r--Documentation/DocBook/media/v4l/controls.xml72
1 files changed, 72 insertions, 0 deletions
diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml
index 06e9a5f..c8eb6c2 100644
--- a/Documentation/DocBook/media/v4l/controls.xml
+++ b/Documentation/DocBook/media/v4l/controls.xml
@@ -4693,4 +4693,76 @@ interface and may change in the future.</para>
</table>
</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.</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>&nbsp;</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_RECEPTION</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">Enables/disables RDS
+ reception by the radio tuner</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TUNE_DEEMPHASIS</constant>&nbsp;</entry>
+ <entry>enum v4l2_deemphasis</entry>
+ </row>
+ <row id="v4l2-deemphasis"><entry spanname="descr">Configures the de-emphasis value for reception.
+A de-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&nbsp;v4l2_deemphasis
+defines possible values for de-emphasis. Here they are:</entry>
+ </row><row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_DEEMPHASIS_DISABLED</constant>&nbsp;</entry>
+ <entry>No de-emphasis is applied.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_DEEMPHASIS_50_uS</constant>&nbsp;</entry>
+ <entry>A de-emphasis of 50 uS is used.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_DEEMPHASIS_75_uS</constant>&nbsp;</entry>
+ <entry>A de-emphasis of 75 uS is used.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+
+ </row>
+ <row><entry></entry></row>
+ </tbody>
+ </tgroup>
+ </table>
+
+ </section>
</section>
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