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| author | Antti Palosaari <crope@iki.fi> | 2015-10-10 19:50:59 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-10-20 20:39:37 +0300 |
| commit | b2411b93cdcb5cb154827b8fcd2f436dd0ddab73 (patch) | |
| tree | 8d1b2c341cc16411b3a727e9156adb56f59a3e4e /Documentation/DocBook | |
| parent | 41018cb84a9ed440db1508d67d9dd4084d5460eb (diff) | |
| download | linux-b2411b93cdcb5cb154827b8fcd2f436dd0ddab73.tar.xz | |
[media] DocBook: document tuner RF gain control
Add brief description for tuner RF gain control.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'Documentation/DocBook')
| -rw-r--r-- | Documentation/DocBook/media/v4l/compat.xml | 4 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/controls.xml | 14 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/v4l2.xml | 1 |
3 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/DocBook/media/v4l/compat.xml b/Documentation/DocBook/media/v4l/compat.xml index 08f4efcab4e9..6c4e95146d16 100644 --- a/Documentation/DocBook/media/v4l/compat.xml +++ b/Documentation/DocBook/media/v4l/compat.xml @@ -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> diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml index 33aece541880..f13a429093f1 100644 --- a/Documentation/DocBook/media/v4l/controls.xml +++ b/Documentation/DocBook/media/v4l/controls.xml @@ -5418,6 +5418,18 @@ set. Unit is in Hz. The range and step are driver-specific.</entry> <entry spanname="descr">Enables/disables IF automatic gain control (AGC)</entry> </row> <row> + <entry spanname="id"><constant>V4L2_CID_RF_TUNER_RF_GAIN</constant> </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> </entry> <entry>integer</entry> </row> @@ -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> diff --git a/Documentation/DocBook/media/v4l/v4l2.xml b/Documentation/DocBook/media/v4l/v4l2.xml index 01a24df92e1d..9cc4117644fc 100644 --- a/Documentation/DocBook/media/v4l/v4l2.xml +++ b/Documentation/DocBook/media/v4l/v4l2.xml @@ -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> |