V4L2_CTRL_CLASS_RF_TUNER  926 include/uapi/linux/v4l2-controls.h #define V4L2_CID_RF_TUNER_CLASS_BASE		(V4L2_CTRL_CLASS_RF_TUNER | 0x900)
V4L2_CTRL_CLASS_RF_TUNER  927 include/uapi/linux/v4l2-controls.h #define V4L2_CID_RF_TUNER_CLASS			(V4L2_CTRL_CLASS_RF_TUNER | 1)