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Diffstat (limited to 'Documentation/media/uapi/v4l')
| -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. |