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Commit b2411b93 authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab
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[media] DocBook: document tuner RF gain control 



Add brief description for tuner RF gain control.

Signed-off-by: default avatarAntti Palosaari <crope@iki.fi>
Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent 41018cb8

Documentation/DocBook/media/v4l/compat.xml

+4 −0
Original line number Diff line number Diff line
@@ -2600,6 +2600,10 @@ and &v4l2-mbus-framefmt;. 
<constant>V4L2_TUNER_ADC</constant> is deprecated now.

	  </para>

	</listitem>

	<listitem>

	  <para>Added <constant>V4L2_CID_RF_TUNER_RF_GAIN</constant>

RF Tuner control.</para>

	</listitem>

      </orderedlist>

    </section>

Documentation/DocBook/media/v4l/controls.xml

+14 −0
Original line number Diff line number Diff line
@@ -5417,6 +5417,18 @@ set. Unit is in Hz. The range and step are driver-specific.</entry> 
            <row>

              <entry spanname="descr">Enables/disables IF automatic gain control (AGC)</entry>

            </row>

            <row>

              <entry spanname="id"><constant>V4L2_CID_RF_TUNER_RF_GAIN</constant>&nbsp;</entry>

              <entry>integer</entry>

            </row>

            <row>

              <entry spanname="descr">The RF amplifier is the very first

amplifier on the receiver signal path, just right after the antenna input.

The difference between the LNA gain and the RF gain in this document is that

the LNA gain is integrated in the tuner chip while the RF gain is a separate

chip. There may be both RF and LNA gain controls in the same device.

The range and step are driver-specific.</entry>

            </row>

            <row>

              <entry spanname="id"><constant>V4L2_CID_RF_TUNER_LNA_GAIN</constant>&nbsp;</entry>

              <entry>integer</entry>
@@ -5425,6 +5437,8 @@ set. Unit is in Hz. The range and step are driver-specific.</entry> 
              <entry spanname="descr">LNA (low noise amplifier) gain is first

gain stage on the RF tuner signal path. It is located very close to tuner

antenna input. Used when <constant>V4L2_CID_RF_TUNER_LNA_GAIN_AUTO</constant> is not set.

See <constant>V4L2_CID_RF_TUNER_RF_GAIN</constant> to understand how RF gain

and LNA gain differs from the each others.

The range and step are driver-specific.</entry>

            </row>

            <row>

Documentation/DocBook/media/v4l/v4l2.xml

+1 −0
Original line number Diff line number Diff line
@@ -156,6 +156,7 @@ applications. --> 
	<date>2015-05-26</date>

	<authorinitials>ap</authorinitials>

	<revremark>Renamed V4L2_TUNER_ADC to V4L2_TUNER_SDR.

Added V4L2_CID_RF_TUNER_RF_GAIN control.

	</revremark>

      </revision>