root/include/uapi/linux/uvcvideo.h

#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)

#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 __user *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 __user *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)

#endif