diff options
| -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 a95d7941533d..ea09c8139c23 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 57515ed7aaab..9ddec24c1401 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 |