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[media] v4l: controls: Improve documentation for V4L2_CID_GAIN 

Elaborate the differences between V4L2_CID_GAIN and gain-type specific
V4L2_CID_DIGITAL_GAIN and V4L2_CID_ANALOGUE_GAIN.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Sakari Ailus 2017-06-09 10:15:50 -03:00 committed by Mauro Carvalho Chehab
parent e72cb0e794
commit 371f94490e
1 changed files with 6 additions and 0 deletions
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6
Documentation/media/uapi/v4l/control.rst
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@ -137,6 +137,12 @@ Control IDs
``V4L2_CID_GAIN`` ``(integer)`` ``V4L2_CID_GAIN`` ``(integer)``
Gain control. Gain control.
Primarily used to control gain on e.g. TV tuners but also on
webcams. Most devices control only digital gain with this control
but on some this could include analogue gain as well. Devices that
recognise the difference between digital and analogue gain use
controls ``V4L2_CID_DIGITAL_GAIN`` and ``V4L2_CID_ANALOGUE_GAIN``.
``V4L2_CID_HFLIP`` ``(boolean)`` ``V4L2_CID_HFLIP`` ``(boolean)``
Mirror the picture horizontally. Mirror the picture horizontally.