v4l2_query_ext_ctrl 2934 drivers/media/v4l2-core/v4l2-ctrls.c int v4l2_query_ext_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_query_ext_ctrl *qc)
v4l2_query_ext_ctrl 1739 include/uapi/linux/videodev2.h struct v4l2_query_ext_ctrl {