hello busch.johannes,
assume you have check Sensor Software Driver Programming Guide for sensor driver implementation.
you may check below kernel sources for available TEGRA_CAMERA_CID_* controls,
let’s taking preferred stride controls as an example,
$L4T_Sources/r32.4.3/Linux_for_Tegra/source/public/kernel/nvidia/include/media/tegra-v4l2-camera.h
#define TEGRA_CAMERA_CID_BASE (V4L2_CTRL_CLASS_CAMERA | 0x2000)
...
#define TEGRA_CAMERA_CID_VI_PREFERRED_STRIDE (TEGRA_CAMERA_CID_BASE+110)
you should also refer to VI driver, which define the CID control property and also parse the control settings,
$L4T_Sources/r32.4.3/Linux_for_Tegra/source/public/kernel/nvidia/drivers/media/platform/tegra/camera/vi/channel.c
static const struct v4l2_ctrl_config common_custom_ctrls[] = {
...
{
.ops = &channel_ctrl_ops,
.id = TEGRA_CAMERA_CID_VI_PREFERRED_STRIDE,
...
int tegra_channel_s_ctrl(struct v4l2_ctrl *ctrl)
switch (ctrl->id) {
...
case TEGRA_CAMERA_CID_VI_PREFERRED_STRIDE:
chan->preferred_stride = ctrl->val;
tegra_channel_update_format(...)
you may enable v4l2-ctl to display all available information, to check whether you’d implement that correctly,
$ v4l2-ctl --all
...
preferred_stride 0x009a206e (int) : min=0 max=65535 step=1 default=0 value=0
then, you’ll able to enable --set-ctrl flags to assign your property settings into VI drivers.
for example, $ v4l2-ctl -d /dev/video0 ... --set-ctrl preferred_stride=256 ...
moreover,
if you would like to extend your customize CID controls,
please adding specific CID flags to tegra-v4l2-camera.h,
you should also have implementation in the VI drivers, channel.c.
thanks