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media: v4l: uapi: ccs: Add CCS controls for shading correction

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Add V4L2 controls for controlling CCS lens shading correction as well as
conveying its capabilities.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Sakari Ailus 2020-09-25 10:28:56 +02:00 committed by Mauro Carvalho Chehab
parent 7a42609843
commit 7c0ed600f0
2 changed files with 15 additions and 0 deletions
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13
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

2
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