From 7c0ed600f04d247cbb4c4030d87a8d36b12d44a4 Mon Sep 17 00:00:00 2001 From: Sakari Ailus Date: Fri, 25 Sep 2020 10:28:56 +0200 Subject: media: v4l: uapi: ccs: Add CCS controls for shading correction Add V4L2 controls for controlling CCS lens shading correction as well as conveying its capabilities. Signed-off-by: Sakari Ailus Signed-off-by: Mauro Carvalho Chehab --- Documentation/userspace-api/media/drivers/ccs.rst | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'Documentation/userspace-api/media') diff --git a/Documentation/userspace-api/media/drivers/ccs.rst b/Documentation/userspace-api/media/drivers/ccs.rst index ea09c8139c23..161cb65f4d98 100644 --- a/Documentation/userspace-api/media/drivers/ccs.rst +++ b/Documentation/userspace-api/media/drivers/ccs.rst @@ -94,4 +94,17 @@ The ``linear`` and ``exponent`` factors can be set using the ``V4L2_CID_CCS_ANALOGUE_LINEAR_GAIN`` and ``V4L2_CID_CCS_ANALOGUE_EXPONENTIAL_GAIN`` controls, respectively +Shading correction +~~~~~~~~~~~~~~~~~~ + +The CCS standard supports lens shading correction. The feature can be controlled +using ``V4L2_CID_CCS_SHADING_CORRECTION``. Additionally, the luminance +correction level may be changed using +``V4L2_CID_CCS_LUMINANCE_CORRECTION_LEVEL``, where value 0 indicates no +correction and 128 indicates correcting the luminance in corners to 10 % less +than in the centre. + +Shading correction needs to be enabled for luminance correction level to have an +effect. + **Copyright** |copy| 2020 Intel Corporation -- cgit v1.2.3