From 851897a4adc42ad7b6327e4c64f599c07a6c5ebb Mon Sep 17 00:00:00 2001 From: Antti Palosaari Date: Thu, 30 Jan 2014 00:00:10 -0300 Subject: [PATCH] [media] DocBook: document RF tuner gain controls Add documentation for LNA, mixer and IF gain controls. These controls are RF tuner specific. Signed-off-by: Antti Palosaari Acked-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- Documentation/DocBook/media/v4l/controls.xml | 91 ++++++++++++++++++++ 1 file changed, 91 insertions(+) diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml index b7f3feb820db..28bf173b017f 100644 --- a/Documentation/DocBook/media/v4l/controls.xml +++ b/Documentation/DocBook/media/v4l/controls.xml @@ -4991,4 +4991,95 @@ defines possible values for de-emphasis. Here they are: + +
+ RF Tuner Control Reference + + The RF Tuner (RF_TUNER) class includes controls for common features +of devices having RF tuner. + + + RF_TUNER Control IDs + + + + + + + + + + + ID + Type + + + Description + + + + + + V4L2_CID_RF_TUNER_CLASS  + class + The RF_TUNER class +descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a +description of this control class. + + + V4L2_CID_RF_TUNER_LNA_GAIN_AUTO  + boolean + + + Enables/disables LNA automatic gain control (AGC) + + + V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO  + boolean + + + Enables/disables mixer automatic gain control (AGC) + + + V4L2_CID_RF_TUNER_IF_GAIN_AUTO  + boolean + + + Enables/disables IF automatic gain control (AGC) + + + V4L2_CID_RF_TUNER_LNA_GAIN  + integer + + + 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 V4L2_CID_RF_TUNER_LNA_GAIN_AUTO is not set. +The range and step are driver-specific. + + + V4L2_CID_RF_TUNER_MIXER_GAIN  + integer + + + Mixer gain is second gain stage on the RF +tuner signal path. It is located inside mixer block, where RF signal is +down-converted by the mixer. Used when V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO +is not set. The range and step are driver-specific. + + + V4L2_CID_RF_TUNER_IF_GAIN  + integer + + + IF gain is last gain stage on the RF tuner +signal path. It is located on output of RF tuner. It controls signal level of +intermediate frequency output or baseband output. Used when +V4L2_CID_RF_TUNER_IF_GAIN_AUTO is not set. The range and step are +driver-specific. + + + +
+
-- 2.39.5