Add V4L2 controls for controlling CCS lens shading correction as well as conveying its capabilities. Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx> --- Documentation/userspace-api/media/drivers/ccs.rst | 13 +++++++++++++ include/uapi/linux/ccs.h | 2 ++ 2 files changed, 15 insertions(+) diff --git a/Documentation/userspace-api/media/drivers/ccs.rst b/Documentation/userspace-api/media/drivers/ccs.rst index a4bac75e36dd..e0666d564574 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 diff --git a/include/uapi/linux/ccs.h b/include/uapi/linux/ccs.h index 6880958ab7b4..445d1789ff44 100644 --- a/include/uapi/linux/ccs.h +++ b/include/uapi/linux/ccs.h @@ -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 -- 2.29.2
