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kernel
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linux
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 <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
authored by
Sakari Ailus
and committed by
Mauro Carvalho Chehab
7c0ed600
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Documentation/userspace-api/media/drivers/ccs.rst
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Documentation/userspace-api/media/drivers/ccs.rst
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``V4L2_CID_CCS_ANALOGUE_LINEAR_GAIN`` and
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``V4L2_CID_CCS_ANALOGUE_EXPONENTIAL_GAIN`` controls, respectively
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Shading correction
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~~~~~~~~~~~~~~~~~~
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The CCS standard supports lens shading correction. The feature can be controlled
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using ``V4L2_CID_CCS_SHADING_CORRECTION``. Additionally, the luminance
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correction level may be changed using
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``V4L2_CID_CCS_LUMINANCE_CORRECTION_LEVEL``, where value 0 indicates no
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correction and 128 indicates correcting the luminance in corners to 10 % less
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than in the centre.
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Shading correction needs to be enabled for luminance correction level to have an
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effect.
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**Copyright** |copy| 2020 Intel Corporation
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include/uapi/linux/ccs.h
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include/uapi/linux/ccs.h
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#define V4L2_CID_CCS_ANALOGUE_GAIN_C1 (V4L2_CID_USER_CCS_BASE + 4)
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#define V4L2_CID_CCS_ANALOGUE_LINEAR_GAIN (V4L2_CID_USER_CCS_BASE + 5)
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#define V4L2_CID_CCS_ANALOGUE_EXPONENTIAL_GAIN (V4L2_CID_USER_CCS_BASE + 6)
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#define V4L2_CID_CCS_SHADING_CORRECTION (V4L2_CID_USER_CCS_BASE + 8)
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#define V4L2_CID_CCS_LUMINANCE_CORRECTION_LEVEL (V4L2_CID_USER_CCS_BASE + 9)
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#endif