text: /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  #ifndef __LINUX_UVCVIDEO_H_
  #define __LINUX_UVCVIDEO_H_
  
  #include <linux/ioctl.h>
  #include <linux/types.h>
  
  /*
   * Dynamic controls
   */
  
  /* Data types for UVC control data */
  #define UVC_CTRL_DATA_TYPE_RAW		0
  #define UVC_CTRL_DATA_TYPE_SIGNED	1
  #define UVC_CTRL_DATA_TYPE_UNSIGNED	2
  #define UVC_CTRL_DATA_TYPE_BOOLEAN	3
  #define UVC_CTRL_DATA_TYPE_ENUM		4
  #define UVC_CTRL_DATA_TYPE_BITMASK	5
  
  /* Control flags */
  #define UVC_CTRL_FLAG_SET_CUR		(1 << 0)
  #define UVC_CTRL_FLAG_GET_CUR		(1 << 1)
  #define UVC_CTRL_FLAG_GET_MIN		(1 << 2)
  #define UVC_CTRL_FLAG_GET_MAX		(1 << 3)
  #define UVC_CTRL_FLAG_GET_RES		(1 << 4)
  #define UVC_CTRL_FLAG_GET_DEF		(1 << 5)
  /* Control should be saved at suspend and restored at resume. */
  #define UVC_CTRL_FLAG_RESTORE		(1 << 6)
  /* Control can be updated by the camera. */
  #define UVC_CTRL_FLAG_AUTO_UPDATE	(1 << 7)
  /* Control supports asynchronous reporting */
  #define UVC_CTRL_FLAG_ASYNCHRONOUS	(1 << 8)
  
  #define UVC_CTRL_FLAG_GET_RANGE \
  	(UVC_CTRL_FLAG_GET_CUR | UVC_CTRL_FLAG_GET_MIN | \
  	 UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES | \
  	 UVC_CTRL_FLAG_GET_DEF)
  
  struct uvc_menu_info {
  	__u32 value;
  	__u8 name[32];
  };
  
  struct uvc_xu_control_mapping {
  	__u32 id;
  	__u8 name[32];
  	__u8 entity[16];
  	__u8 selector;
  
  	__u8 size;
  	__u8 offset;
  	__u32 v4l2_type;
  	__u32 data_type;
  
  	struct uvc_menu_info *menu_info;
  	__u32 menu_count;
  
  	__u32 reserved[4];
  };
  
  struct uvc_xu_control_query {
  	__u8 unit;
  	__u8 selector;
  	__u8 query;		/* Video Class-Specific Request Code, */
  				/* defined in linux/usb/video.h A.8.  */
  	__u16 size;
  	__u8 *data;
  };
  
  #define UVCIOC_CTRL_MAP		_IOWR('u', 0x20, struct uvc_xu_control_mapping)
  #define UVCIOC_CTRL_QUERY	_IOWR('u', 0x21, struct uvc_xu_control_query)
  
  /*
   * Metadata node
   */
  
  /**
   * struct uvc_meta_buf - metadata buffer building block
   * @ns: system timestamp of the payload in nanoseconds
   * @sof: USB Frame Number
   * @length: length of the payload header
   * @flags: payload header flags
   * @buf: optional device-specific header data
   *
   * UVC metadata nodes fill buffers with possibly multiple instances of this
   * struct. The first two fields are added by the driver, they can be used for
   * clock synchronisation. The rest is an exact copy of a UVC payload header.
   * Only complete objects with complete buffers are included. Therefore it's
   * always sizeof(meta->ts) + sizeof(meta->sof) + meta->length bytes large.
   */
  struct uvc_meta_buf {
  	__u64 ns;
  	__u16 sof;
  	__u8 length;
  	__u8 flags;
  	__u8 buf[];
  } __attribute__((packed));
  
  #endif