v4l2_queryctrl   3027 drivers/media/v4l2-core/v4l2-ctrls.c int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
v4l2_queryctrl   1726 include/uapi/linux/videodev2.h struct v4l2_queryctrl {