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.ai...@linux.intel.com>
Acked-by: Hans Verkuil <hans.verk...@cisco.com>
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.
>
>
