Add two new controls for alternative analogue gain some CCS compliant camera sensors support. 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 ae02168ccd89..a4bac75e36dd 100644 --- a/Documentation/userspace-api/media/drivers/ccs.rst +++ b/Documentation/userspace-api/media/drivers/ccs.rst @@ -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 diff --git a/include/uapi/linux/ccs.h b/include/uapi/linux/ccs.h index 2aeea7e0622e..6880958ab7b4 100644 --- a/include/uapi/linux/ccs.h +++ b/include/uapi/linux/ccs.h @@ -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 -- 2.29.2
