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| author | Sakari Ailus <sakari.ailus@linux.intel.com> | 2020-09-25 11:28:56 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-01-12 19:31:14 +0300 |
| commit | 7c0ed600f04d247cbb4c4030d87a8d36b12d44a4 (patch) | |
| tree | a8b5c3665a4cfd93588ffd46783fa291fa76b8b4 | |
| parent | 7a42609843d2f09de842b825bfefa9fed40e3e7a (diff) | |
| download | linux-7c0ed600f04d247cbb4c4030d87a8d36b12d44a4.tar.xz | |
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>
| -rw-r--r-- | Documentation/userspace-api/media/drivers/ccs.rst | 13 | ||||
| -rw-r--r-- | include/uapi/linux/ccs.h | 2 |
2 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/drivers/ccs.rst b/Documentation/userspace-api/media/drivers/ccs.rst index ea09c8139c23..161cb65f4d98 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 9ddec24c1401..2896d3bfdb5e 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 |