On 06/09/17 15:21, Sakari Ailus wrote: > 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@xxxxxxxxxxxxxxx> Acked-by: Hans Verkuil <hans.verkuil@xxxxxxxxx> Regards, Hans > --- > Documentation/media/uapi/v4l/control.rst | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/Documentation/media/uapi/v4l/control.rst b/Documentation/media/uapi/v4l/control.rst > index 51112ba..c1e6adb 100644 > --- a/Documentation/media/uapi/v4l/control.rst > +++ b/Documentation/media/uapi/v4l/control.rst > @@ -137,6 +137,12 @@ Control IDs > ``V4L2_CID_GAIN`` ``(integer)`` > 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)`` > Mirror the picture horizontally. > >
