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media: v4l: uapi: ccs: Add controls for CCS alternative analogue gain

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Add two new controls for alternative analogue gain some CCS compliant
camera sensors support.

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 2020-09-24 21:57:52 +02:00 committed by Mauro Carvalho Chehab
parent ee25e211ad
commit a75210a62b
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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@ -81,4 +81,17 @@ obtained from the following controls:
The analogue gain (``x`` in the formula) is controlled through
``V4L2_CID_ANALOGUE_GAIN`` in this case.
Alternate analogue gain model
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The CCS defines another analogue gain model called alternate analogue gain. In
this case, the formula to calculate actual gain consists of linear and
exponential parts:
gain = linear * 2 ^ exponent
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
**Copyright** |copy| 2020 Intel Corporation

2
include/uapi/linux/ccs.h
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@ -10,5 +10,7 @@
#define V4L2_CID_CCS_ANALOGUE_GAIN_C0 (V4L2_CID_USER_CCS_BASE + 2)
#define V4L2_CID_CCS_ANALOGUE_GAIN_M1 (V4L2_CID_USER_CCS_BASE + 3)
#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)
#endif