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| author |   Sakari Ailus <sakari.ailus@linux.intel.com> | 2017-06-09 10:15:50 -0300 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-06-20 08:14:57 -0300 |
| commit | 371f94490ea97e1bf766ba0d33ffb62f5f5a4ed1 (patch) | |
| tree | a3a91347503bb0df050dbf8b382916af14ee504b /Documentation/media | |
| parent | [media] v4l: ctrls: Add a control for digital gain (diff) | |
| download | linux-dev-371f94490ea97e1bf766ba0d33ffb62f5f5a4ed1.tar.xz linux-dev-371f94490ea97e1bf766ba0d33ffb62f5f5a4ed1.zip | |
[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>
Diffstat (limited to 'Documentation/media')
| -rw-r--r-- | Documentation/media/uapi/v4l/control.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/media/uapi/v4l/control.rst b/Documentation/media/uapi/v4l/control.rst index 51112badb804..c1e6adbe83d7 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. |