v4l2_chip_ident  1451 include/linux/videodev2.h #define VIDIOC_G_CHIP_IDENT     _IOWR('V', 81, struct v4l2_chip_ident)
v4l2_chip_ident   132 include/media/soc_camera.h 			   struct v4l2_chip_ident *);
v4l2_chip_ident   233 include/media/v4l2-ioctl.h 					struct v4l2_chip_ident *chip);