Commit 7c0ed600 authored by Sakari Ailus's avatar Sakari Ailus Committed by Mauro Carvalho Chehab
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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: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
parent 7a426098

Documentation/userspace-api/media/drivers/ccs.rst

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@@ -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

include/uapi/linux/ccs.h

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@@ -12,5 +12,7 @@ 
#define V4L2_CID_CCS_ANALOGUE_GAIN_C1		(V4L2_CID_USER_CCS_BASE + 4)

#define V4L2_CID_CCS_ANALOGUE_LINEAR_GAIN	(V4L2_CID_USER_CCS_BASE + 5)

#define V4L2_CID_CCS_ANALOGUE_EXPONENTIAL_GAIN	(V4L2_CID_USER_CCS_BASE + 6)

#define V4L2_CID_CCS_SHADING_CORRECTION		(V4L2_CID_USER_CCS_BASE + 8)

#define V4L2_CID_CCS_LUMINANCE_CORRECTION_LEVEL	(V4L2_CID_USER_CCS_BASE + 9)



#endif