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>
``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
#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