RemdesKVM/usbkvm/For v1 and 2 PCB/usbkvm_fw/src/remdesHid/StdDescriptors.h

/*
             LUFA Library
     Copyright (C) Dean Camera, 2021.

  dean [at] fourwalledcubicle [dot] com
           www.lufa-lib.org
*/

/*
  Copyright 2021  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, distribute, and sell this
  software and its documentation for any purpose is hereby granted
  without fee, provided that the above copyright notice appear in
  all copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting
  documentation, and that the name of the author not be used in
  advertising or publicity pertaining to distribution of the
  software without specific, written prior permission.

  The author disclaims all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \file
 *  \brief Common standard USB Descriptor definitions for all architectures.
 *  \copydetails Group_StdDescriptors
 *
 *  \note This file should not be included directly. It is automatically
 * included as needed by the USB driver dispatch header located in
 * LUFA/Drivers/USB/USB.h.
 */

/** \ingroup Group_USB
 *  \defgroup Group_StdDescriptors USB Descriptors
 *  \brief Standard USB Descriptor definitions.
 *
 *  Standard USB device descriptor defines and retrieval routines, for USB
 * devices. This module contains structures and macros for the easy creation of
 * standard USB descriptors in USB device projects.
 *
 *  @{
 */

#ifndef __USBDESCRIPTORS_H__
#define __USBDESCRIPTORS_H__

#include <stdint.h>

/* Public Interface - May be used in end-application: */
/* Macros: */

/** Mask for a CONTROL type endpoint or pipe.
 *
 *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for
 * endpoint/pipe functions.
 */
#define EP_TYPE_CONTROL 0x00

/** Mask for an ISOCHRONOUS type endpoint or pipe.
 *
 *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for
 * endpoint/pipe functions.
 */
#define EP_TYPE_ISOCHRONOUS 0x01

/** Mask for a BULK type endpoint or pipe.
 *
 *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for
 * endpoint/pipe functions.
 */
#define EP_TYPE_BULK 0x02

/** Mask for an INTERRUPT type endpoint or pipe.
 *
 *  \note See \ref Group_EndpointManagement and \ref Group_PipeManagement for
 * endpoint/pipe functions.
 */
#define EP_TYPE_INTERRUPT 0x03

/** Indicates that a given descriptor does not exist in the device. This can be
 * used inside descriptors for string descriptor indexes, or may be use as a
 * return value for GetDescriptor when the specified descriptor does not exist.
 */
#define NO_DESCRIPTOR 0

/** Macro to calculate the power value for the configuration descriptor, from a
 * given number of milliamperes.
 *
 *  \param[in] mA  Maximum number of milliamps the device consumes when the
 * given configuration is selected.
 */
#define USB_CONFIG_POWER_MA(mA) ((mA) >> 1)

/** Macro to calculate the Unicode length of a string with a given number of
 * Unicode characters. Should be used in string descriptor's headers for giving
 * the string descriptor's byte length.
 *
 *  \param[in] UnicodeChars  Number of Unicode characters in the string text.
 */
#define USB_STRING_LEN(UnicodeChars)                                           \
  (sizeof(USB_Descriptor_Header_t) + ((UnicodeChars) << 1))

/** Convenience macro to easily create \ref USB_Descriptor_String_t instances
 * from a wide character string.
 *
 *  \note This macro is for little-endian systems only.
 *
 *  \param[in] String  String to initialize a USB String Descriptor structure
 * with.
 */
#define USB_STRING_DESCRIPTOR(String)                                          \
  {                                                                            \
    .Header = {.Size = sizeof(USB_Descriptor_Header_t) + (sizeof(String) - 2), \
               .Type = DTYPE_String},                                          \
    .UnicodeString = String                                                    \
  }

/** Convenience macro to easily create \ref USB_Descriptor_String_t instances
 * from an array of characters.
 *
 *  \param[in] ...  Characters to initialize a USB String Descriptor structure
 * with.
 */
#define USB_STRING_DESCRIPTOR_ARRAY(...)                                       \
  {                                                                            \
    .Header = {.Size = sizeof(USB_Descriptor_Header_t) +                       \
                       sizeof((uint16_t[]){__VA_ARGS__}),                      \
               .Type = DTYPE_String},                                          \
    .UnicodeString = {                                                         \
      __VA_ARGS__                                                              \
    }                                                                          \
  }

/** Macro to encode a given major/minor/revision version number into Binary
 * Coded Decimal format for descriptor fields requiring BCD encoding, such as
 * the USB version number in the standard device descriptor.
 *
 *  \note This value is automatically converted into Little Endian, suitable for
 * direct use inside device descriptors on all architectures without endianness
 * conversion macros.
 *
 *  \param[in]  Major     Major version number to encode.
 *  \param[in]  Minor     Minor version number to encode.
 *  \param[in]  Revision  Revision version number to encode.
 */
#define VERSION_BCD(Major, Minor, Revision)                                    \
  (((Major & 0xFF) << 8) | ((Minor & 0x0F) << 4) | (Revision & 0x0F))

/** String language ID for the English language. Should be used in \ref
 * USB_Descriptor_String_t descriptors to indicate that the English language is
 * supported by the device in its string descriptors.
 */
#define LANGUAGE_ID_ENG 0x0409

/** \name USB Configuration Descriptor Attribute Masks */
/**@{*/
/** Mask for the reserved bit in the Configuration Descriptor's \c
 * ConfigAttributes field, which must be always set on all USB devices for
 * historical purposes.
 */
#define USB_CONFIG_ATTR_RESERVED 0x80

/** Can be masked with other configuration descriptor attributes for a \ref
 * USB_Descriptor_Configuration_Header_t descriptor's \c ConfigAttributes value
 * to indicate that the specified configuration can draw its power from the
 * device's own power source, instead of drawing it from the USB host.
 *
 *  Note that the host will probe this dynamically - the device should report
 * its current power state via the \ref USB_Device_CurrentlySelfPowered global
 * variable.
 */
#define USB_CONFIG_ATTR_SELFPOWERED 0x40

/** Can be masked with other configuration descriptor attributes for a \ref
 * USB_Descriptor_Configuration_Header_t descriptor's \c ConfigAttributes value
 * to indicate that the specified configuration supports the remote wakeup
 * feature of the USB standard, allowing a suspended USB device to wake up the
 * host upon request.
 *
 *  If set, the host will dynamically enable and disable remote wakeup support,
 * indicated via the \ref USB_Device_RemoteWakeupEnabled global variable. To
 * initiate a remote wakeup of the host (when allowed) see \ref
 * USB_Device_RemoteWakeupEnabled().
 */
#define USB_CONFIG_ATTR_REMOTEWAKEUP 0x20
/**@}*/

/** \name Endpoint Descriptor Attribute Masks */
/**@{*/
/** Can be masked with other endpoint descriptor attributes for a \ref
 * USB_Descriptor_Endpoint_t descriptor's \c Attributes value to indicate that
 * the specified endpoint is not synchronized.
 *
 *  \see The USB specification for more details on the possible Endpoint
 * attributes.
 */
#define ENDPOINT_ATTR_NO_SYNC (0 << 2)

/** Can be masked with other endpoint descriptor attributes for a \ref
 * USB_Descriptor_Endpoint_t descriptor's \c Attributes value to indicate that
 * the specified endpoint is asynchronous.
 *
 *  \see The USB specification for more details on the possible Endpoint
 * attributes.
 */
#define ENDPOINT_ATTR_ASYNC (1 << 2)

/** Can be masked with other endpoint descriptor attributes for a \ref
 * USB_Descriptor_Endpoint_t descriptor's \c Attributes value to indicate that
 * the specified endpoint is adaptive.
 *
 *  \see The USB specification for more details on the possible Endpoint
 * attributes.
 */
#define ENDPOINT_ATTR_ADAPTIVE (2 << 2)

/** Can be masked with other endpoint descriptor attributes for a \ref
 * USB_Descriptor_Endpoint_t descriptor's \c Attributes value to indicate that
 * the specified endpoint is synchronized.
 *
 *  \see The USB specification for more details on the possible Endpoint
 * attributes.
 */
#define ENDPOINT_ATTR_SYNC (3 << 2)
/**@}*/

/** \name Endpoint Descriptor Usage Masks */
/**@{*/
/** Can be masked with other endpoint descriptor attributes for a \ref
 * USB_Descriptor_Endpoint_t descriptor's \c Attributes value to indicate that
 * the specified endpoint is used for data transfers.
 *
 *  \see The USB specification for more details on the possible Endpoint usage
 * attributes.
 */
#define ENDPOINT_USAGE_DATA (0 << 4)

/** Can be masked with other endpoint descriptor attributes for a \ref
 * USB_Descriptor_Endpoint_t descriptor's \c Attributes value to indicate that
 * the specified endpoint is used for feedback.
 *
 *  \see The USB specification for more details on the possible Endpoint usage
 * attributes.
 */
#define ENDPOINT_USAGE_FEEDBACK (1 << 4)

/** Can be masked with other endpoint descriptor attributes for a \ref
 * USB_Descriptor_Endpoint_t descriptor's \c Attributes value to indicate that
 * the specified endpoint is used for implicit feedback.
 *
 *  \see The USB specification for more details on the possible Endpoint usage
 * attributes.
 */
#define ENDPOINT_USAGE_IMPLICIT_FEEDBACK (2 << 4)
/**@}*/

/* Enums: */
/** Enum for the possible standard descriptor types, as given in each
 * descriptor's header. */
enum USB_DescriptorTypes_t {
  DTYPE_Device =
      0x01, /**< Indicates that the descriptor is a device descriptor. */
  DTYPE_Configuration =
      0x02, /**< Indicates that the descriptor is a configuration descriptor. */
  DTYPE_String =
      0x03, /**< Indicates that the descriptor is a string descriptor. */
  DTYPE_Interface =
      0x04, /**< Indicates that the descriptor is an interface descriptor. */
  DTYPE_Endpoint =
      0x05, /**< Indicates that the descriptor is an endpoint descriptor. */
  DTYPE_DeviceQualifier = 0x06, /**< Indicates that the descriptor is a device
                                   qualifier descriptor. */
  DTYPE_Other = 0x07, /**< Indicates that the descriptor is of other type. */
  DTYPE_InterfacePower = 0x08,       /**< Indicates that the descriptor is an
                                        interface power descriptor. */
  DTYPE_InterfaceAssociation = 0x0B, /**< Indicates that the descriptor is an
                                        interface association descriptor. */
};

/** Enum for possible Class, Subclass and Protocol values of device and
 * interface descriptors. */
enum USB_Descriptor_ClassSubclassProtocol_t {
  USB_CSCP_NoDeviceClass =
      0x00, /**< Descriptor Class value indicating that the device does not
             * belong to a particular class at the device level.
             */
  USB_CSCP_NoDeviceSubclass =
      0x00, /**< Descriptor Subclass value indicating that the device does not
             * belong to a particular subclass at the device level.
             */
  USB_CSCP_NoDeviceProtocol =
      0x00, /**< Descriptor Protocol value indicating that the device does not
             * belong to a particular protocol at the device level.
             */
  USB_CSCP_VendorSpecificClass =
      0xFF, /**< Descriptor Class value indicating that the device/interface
             * belongs to a vendor specific class.
             */
  USB_CSCP_VendorSpecificSubclass =
      0xFF, /**< Descriptor Subclass value indicating that the device/interface
             * belongs to a vendor specific subclass.
             */
  USB_CSCP_VendorSpecificProtocol =
      0xFF, /**< Descriptor Protocol value indicating that the device/interface
             * belongs to a vendor specific protocol.
             */
  USB_CSCP_IADDeviceClass =
      0xEF, /**< Descriptor Class value indicating that the device belongs to
             * the Interface Association Descriptor class.
             */
  USB_CSCP_IADDeviceSubclass =
      0x02, /**< Descriptor Subclass value indicating that the device belongs to
             * the Interface Association Descriptor subclass.
             */
  USB_CSCP_IADDeviceProtocol =
      0x01, /**< Descriptor Protocol value indicating that the device belongs to
             * the Interface Association Descriptor protocol.
             */
};

/* Type Defines: */
/** \brief Standard USB Descriptor Header (LUFA naming conventions).
 *
 *  Type define for all descriptors' standard header, indicating the
 * descriptor's length and type. This structure uses LUFA-specific element names
 * to make each element's purpose clearer.
 *
 *  \see \ref USB_StdDescriptor_Header_t for the version of this type with
 * standard element names.
 *
 *  \note Regardless of CPU architecture, these values should be stored as
 * little endian.
 */
typedef struct {
  uint8_t Size; /**< Size of the descriptor, in bytes. */
  uint8_t Type; /**< Type of the descriptor, either a value in \ref
                 * USB_DescriptorTypes_t or a value given by the specific class.
                 */
} USB_Descriptor_Header_t;

/** \brief Standard USB Device Descriptor (LUFA naming conventions).
 *
 *  Type define for a standard Device Descriptor. This structure uses
 * LUFA-specific element names to make each element's purpose clearer.
 *
 *  \see \ref USB_StdDescriptor_Device_t for the version of this type with
 * standard element names.
 *
 *  \note Regardless of CPU architecture, these values should be stored as
 * little endian.
 */
typedef struct {
  USB_Descriptor_Header_t
      Header; /**< Descriptor header, including type and size. */

  uint16_t USBSpecification; /**< BCD of the supported USB specification.
                              *
                              *   \see \ref VERSION_BCD() utility macro.
                              */
  uint8_t Class;             /**< USB device class. */
  uint8_t SubClass;          /**< USB device subclass. */
  uint8_t Protocol;          /**< USB device protocol. */

  uint8_t Endpoint0Size; /**< Size of the control (address 0) endpoint's bank in
                            bytes. */

  uint16_t VendorID;      /**< Vendor ID for the USB product. */
  uint16_t ProductID;     /**< Unique product ID for the USB product. */
  uint16_t ReleaseNumber; /**< Product release (version) number.
                           *
                           *   \see \ref VERSION_BCD() utility macro.
                           */
  uint8_t
      ManufacturerStrIndex; /**< String index for the manufacturer's name. The
                             *   host will request this string via a separate
                             *   control request for the string descriptor.
                             *
                             *   \note If no string supplied, use \ref
                             * NO_DESCRIPTOR.
                             */
  uint8_t ProductStrIndex;  /**< String index for the product name/details.
                             *
                             *  \see ManufacturerStrIndex structure entry.
                             */
  uint8_t
      SerialNumStrIndex; /**< String index for the product's globally unique
                          * hexadecimal serial number, in uppercase Unicode
                          * ASCII.
                          *
                          *  \note On some microcontroller models, there is an
                          * embedded serial number in the chip which can be used
                          * for the device serial number. To use this serial
                          * number, set this to \c USE_INTERNAL_SERIAL. On
                          * unsupported devices, this will evaluate to \ref
                          * NO_DESCRIPTOR and will cause the host to generate a
                          * pseudo-unique value for the device upon insertion.
                          *
                          *  \see \c ManufacturerStrIndex structure entry.
                          */
  uint8_t NumberOfConfigurations; /**< Total number of configurations supported
                                     by the device.*/
} USB_Descriptor_Device_t;

// 		/** \brief Standard USB Device Qualifier Descriptor (LUFA naming
// conventions).
// 		 *
// 		 *  Type define for a standard Device Qualifier Descriptor. This
// structure uses LUFA-specific element names
// 		 *  to make each element's purpose clearer.
// 		 *
// 		 *  \see \ref USB_StdDescriptor_DeviceQualifier_t for the
// version of this type with standard element names.
// 		 */
// 		typedef struct
// 		{
// 			USB_Descriptor_Header_t Header; /**< Descriptor header,
// including type and size. */

// 			uint16_t USBSpecification; /**< BCD of the supported USB
// specification.
// 			                            *
// 			                            *   \see \ref VERSION_BCD()
// utility macro.
// 			                            */
// 			uint8_t  Class; /**< USB device class. */
// 			uint8_t  SubClass; /**< USB device subclass. */
// 			uint8_t  Protocol; /**< USB device protocol. */

// 			uint8_t  Endpoint0Size; /**< Size of the control
// (address 0) endpoint's bank in bytes. */ 			uint8_t
// NumberOfConfigurations;
// /**< Total number of configurations supported by
// 			                                  *   the device.
// 			                                  */
// 			uint8_t  Reserved; /**< Reserved for future use, must be
// 0.
// */ 		} ATTR_PACKED USB_Descriptor_DeviceQualifier_t;

// 		/** \brief Standard USB Device Qualifier Descriptor (USB-IF
// naming conventions).
// 		 *
// 		 *  Type define for a standard Device Qualifier Descriptor. This
// structure uses the relevant standard's given element names
// 		 *  to ensure compatibility with the standard.
// 		 *
// 		 *  \see \ref USB_Descriptor_DeviceQualifier_t for the version
// of this type with non-standard LUFA specific element names.
// 		 */
// 		typedef struct
// 		{
// 			uint8_t  bLength; /**< Size of the descriptor, in bytes.
// */ 			uint8_t  bDescriptorType; /**< Type of the descriptor,
// either a value in \ref USB_DescriptorTypes_t or a value
// 			                           *   given by the specific
// class.
// 			                           */
// 			uint16_t bcdUSB; /**< BCD of the supported USB
// specification.
// 			                  *
// 			                  *   \see \ref VERSION_BCD() utility
// macro.
// 			                  */
// 			uint8_t  bDeviceClass; /**< USB device class. */
// 			uint8_t  bDeviceSubClass; /**< USB device subclass. */
// 			uint8_t  bDeviceProtocol; /**< USB device protocol. */
// 			uint8_t  bMaxPacketSize0; /**< Size of the control
// (address 0)
// endpoint's bank in bytes. */ 			uint8_t
// bNumConfigurations;
// /**< Total number of configurations supported by
// 			                              *   the device.
// 			                              */
// 			uint8_t  bReserved; /**< Reserved for future use, must
// be 0.
// */ 		} ATTR_PACKED USB_StdDescriptor_DeviceQualifier_t;

/** \brief Standard USB Configuration Descriptor (LUFA naming conventions).
 *
 *  Type define for a standard Configuration Descriptor header. This structure
 * uses LUFA-specific element names to make each element's purpose clearer.
 *
 *  \see \ref USB_StdDescriptor_Configuration_Header_t for the version of this
 * type with standard element names.
 *
 *  \note Regardless of CPU architecture, these values should be stored as
 * little endian.
 */
typedef struct {
  USB_Descriptor_Header_t
      Header; /**< Descriptor header, including type and size. */

  uint16_t TotalConfigurationSize; /**< Size of the configuration descriptor
                                    * header, and all sub descriptors inside the
                                    * configuration.
                                    */
  uint8_t
      TotalInterfaces; /**< Total number of interfaces in the configuration. */

  uint8_t ConfigurationNumber;   /**< Configuration index of the current
                                    configuration. */
  uint8_t ConfigurationStrIndex; /**< Index of a string descriptor describing
                                    the configuration. */

  uint8_t
      ConfigAttributes; /**< Configuration attributes, comprised of a mask of \c
                         * USB_CONFIG_ATTR_* masks. On all devices, this should
                         * include USB_CONFIG_ATTR_RESERVED at a minimum.
                         */

  uint8_t MaxPowerConsumption; /**< Maximum power consumption of the device
                                * while in the current configuration, calculated
                                * by the \ref USB_CONFIG_POWER_MA() macro.
                                */
} USB_Descriptor_Configuration_Header_t;

// 		/** \brief Standard USB Configuration Descriptor (USB-IF naming
// conventions).
// 		 *
// 		 *  Type define for a standard Configuration Descriptor header.
// This structure uses the relevant standard's given element names
// 		 *  to ensure compatibility with the standard.
// 		 *
// 		 *  \see \ref USB_Descriptor_Device_t for the version of this
// type with non-standard LUFA specific element names.
// 		 *
// 		 *  \note Regardless of CPU architecture, these values should be
// stored as little endian.
// 		 */
// 		typedef struct
// 		{
// 			uint8_t  bLength; /**< Size of the descriptor, in bytes.
// */ 			uint8_t  bDescriptorType; /**< Type of the descriptor,
// either a value in \ref USB_DescriptorTypes_t or a value
// 			                           *   given by the specific
// class.
// 			                           */
// 			uint16_t wTotalLength; /**< Size of the configuration
// descriptor header,
// 			                           *   and all sub descriptors
// inside the configuration.
// 			                           */
// 			uint8_t  bNumInterfaces; /**< Total number of interfaces
// in
// the configuration. */ 			uint8_t  bConfigurationValue;
// /**< Configuration index
// of the current configuration. */ 			uint8_t  iConfiguration;
// /**< Index of a string descriptor describing the configuration. */
// uint8_t bmAttributes;
// /**< Configuration attributes, comprised of a mask of \c USB_CONFIG_ATTR_*
// masks.
// 			                        *   On all devices, this should
// include USB_CONFIG_ATTR_RESERVED at a minimum.
// 			                        */
// 			uint8_t  bMaxPower; /**< Maximum power consumption of
// the device while in the
// 			                     *   current configuration,
// calculated by the \ref USB_CONFIG_POWER_MA()
// 			                     *   macro.
// 			                     */
// 		} ATTR_PACKED USB_StdDescriptor_Configuration_Header_t;

/** \brief Standard USB Interface Descriptor (LUFA naming conventions).
 *
 *  Type define for a standard Interface Descriptor. This structure uses
 * LUFA-specific element names to make each element's purpose clearer.
 *
 *  \see \ref USB_StdDescriptor_Interface_t for the version of this type with
 * standard element names.
 *
 *  \note Regardless of CPU architecture, these values should be stored as
 * little endian.
 */
typedef struct {
  USB_Descriptor_Header_t
      Header; /**< Descriptor header, including type and size. */

  uint8_t InterfaceNumber;  /**< Index of the interface in the current
                               configuration. */
  uint8_t AlternateSetting; /**< Alternate setting for the interface number. The
                             * same interface number can have multiple alternate
                             * settings with different endpoint configurations,
                             * which can be selected by the host.
                             */
  uint8_t TotalEndpoints;   /**< Total number of endpoints in the interface. */

  uint8_t Class;    /**< Interface class ID. */
  uint8_t SubClass; /**< Interface subclass ID. */
  uint8_t Protocol; /**< Interface protocol ID. */

  uint8_t InterfaceStrIndex; /**< Index of the string descriptor describing the
                                interface. */
} USB_Descriptor_Interface_t;

// 		/** \brief Standard USB Interface Descriptor (USB-IF naming
// conventions).
// 		 *
// 		 *  Type define for a standard Interface Descriptor. This
// structure uses the relevant standard's given element names
// 		 *  to ensure compatibility with the standard.
// 		 *
// 		 *  \see \ref USB_Descriptor_Interface_t for the version of this
// type with non-standard LUFA specific element names.
// 		 *
// 		 *  \note Regardless of CPU architecture, these values should be
// stored as little endian.
// 		 */
// 		typedef struct
// 		{
// 			uint8_t bLength; /**< Size of the descriptor, in bytes.
// */ 			uint8_t bDescriptorType; /**< Type of the descriptor,
// either a value in \ref USB_DescriptorTypes_t or a value
// 			                          *   given by the specific
// class.
// 			                          */
// 			uint8_t bInterfaceNumber; /**< Index of the interface in
// the
// current configuration. */ 			uint8_t bAlternateSetting; /**<
// Alternate setting for the interface number. The same
// 			                            *   interface number can
// have multiple alternate settings
// 			                            *   with different endpoint
// configurations, which can be
// 			                            *   selected by the host.
// 			                            */
// 			uint8_t bNumEndpoints; /**< Total number of endpoints in
// the
// interface. */ 			uint8_t bInterfaceClass; /**< Interface
// class ID. */ 			uint8_t bInterfaceSubClass; /**<
// Interface subclass ID. */ 			uint8_t bInterfaceProtocol; /**<
// Interface protocol ID. */ 			uint8_t iInterface; /**< Index
// of the string descriptor describing the
// 			                     *   interface.
// 			                     */
// 		} ATTR_PACKED USB_StdDescriptor_Interface_t;

/** \brief Standard USB Interface Association Descriptor (LUFA naming
 * conventions).
 *
 *  Type define for a standard Interface Association Descriptor. This structure
 * uses LUFA-specific element names to make each element's purpose clearer.
 *
 *  This descriptor has been added as a supplement to the USB2.0 standard, in
 * the ECN located at
 *  <a>http://www.usb.org/developers/docs/InterfaceAssociationDescriptor_ecn.pdf</a>.
 * It allows composite devices with multiple interfaces related to the same
 * function to have the multiple interfaces bound together at the point of
 * enumeration, loading one generic driver for all the interfaces in the single
 *  function. Read the ECN for more information.
 *
 *  \see \ref USB_StdDescriptor_Interface_Association_t for the version of this
 * type with standard element names.
 *
 *  \note Regardless of CPU architecture, these values should be stored as
 * little endian.
 */
typedef struct {
  USB_Descriptor_Header_t
      Header; /**< Descriptor header, including type and size. */

  uint8_t FirstInterfaceIndex; /**< Index of the first associated interface. */
  uint8_t TotalInterfaces;     /**< Total number of associated interfaces. */

  uint8_t Class;    /**< Interface class ID. */
  uint8_t SubClass; /**< Interface subclass ID. */
  uint8_t Protocol; /**< Interface protocol ID. */

  uint8_t IADStrIndex; /**< Index of the string descriptor describing the
                        *   interface association.
                        */
} USB_Descriptor_Interface_Association_t;

// 		/** \brief Standard USB Interface Association Descriptor (USB-IF
// naming conventions).
// 		 *
// 		 *  Type define for a standard Interface Association Descriptor.
// This structure uses the relevant standard's given
// 		 *  element names to ensure compatibility with the standard.
// 		 *
// 		 *  This descriptor has been added as a supplement to the USB2.0
// standard, in the ECN located at
// 		 *
// <a>http://www.usb.org/developers/docs/InterfaceAssociationDescriptor_ecn.pdf</a>.
// It allows composite
// 		 *  devices with multiple interfaces related to the same
// function to have the multiple interfaces bound
// 		 *  together at the point of enumeration, loading one generic
// driver for all the interfaces in the single
// 		 *  function. Read the ECN for more information.
// 		 *
// 		 *  \see \ref USB_Descriptor_Interface_Association_t for the
// version of this type with non-standard LUFA specific
// 		 *       element names.
// 		 *
// 		 *  \note Regardless of CPU architecture, these values should be
// stored as little endian.
// 		 */
// 		typedef struct
// 		{
// 			uint8_t bLength; /**< Size of the descriptor, in bytes.
// */ 			uint8_t bDescriptorType; /**< Type of the descriptor,
// either a value in \ref USB_DescriptorTypes_t or a value
// 			                          *   given by the specific
// class.
// 			                          */
// 			uint8_t bFirstInterface; /**< Index of the first
// associated
// interface. */ 			uint8_t bInterfaceCount; /**< Total
// number of associated interfaces. */ 			uint8_t bFunctionClass;
// /**< Interface class ID. */ 			uint8_t bFunctionSubClass; /**<
// Interface subclass ID. */ 			uint8_t bFunctionProtocol;
// /**< Interface protocol ID. */ 			uint8_t iFunction; /**<
// Index of the string descriptor describing the
// 			                    *   interface association.
// 			                    */
// 		} ATTR_PACKED USB_StdDescriptor_Interface_Association_t;

/** \brief Standard USB Endpoint Descriptor (LUFA naming conventions).
 *
 *  Type define for a standard Endpoint Descriptor. This structure uses
 * LUFA-specific element names to make each element's purpose clearer.
 *
 *  \see \ref USB_StdDescriptor_Endpoint_t for the version of this type with
 * standard element names.
 *
 *  \note Regardless of CPU architecture, these values should be stored as
 * little endian.
 */
typedef struct {
  USB_Descriptor_Header_t
      Header; /**< Descriptor header, including type and size. */

  uint8_t EndpointAddress; /**< Logical address of the endpoint within the
                            * device for the current configuration, including
                            * direction mask.
                            */
  uint8_t
      Attributes; /**< Endpoint attributes, comprised of a mask of the endpoint
                   * type (EP_TYPE_*) and attributes (ENDPOINT_ATTR_*) masks.
                   */
  uint16_t EndpointSize; /**< Size of the endpoint bank, in bytes. This
                          * indicates the maximum packet size that the endpoint
                          * can receive at a time.
                          */
  uint8_t
      PollingIntervalMS; /**< Polling interval in milliseconds for the endpoint
                          * if it is an INTERRUPT or ISOCHRONOUS type.
                          */
} USB_Descriptor_Endpoint_t;

// 		/** \brief Standard USB Endpoint Descriptor (USB-IF naming
// conventions).
// 		 *
// 		 *  Type define for a standard Endpoint Descriptor. This
// structure uses the relevant standard's given
// 		 *  element names to ensure compatibility with the standard.
// 		 *
// 		 *  \see \ref USB_Descriptor_Endpoint_t for the version of this
// type with non-standard LUFA specific
// 		 *       element names.
// 		 *
// 		 *  \note Regardless of CPU architecture, these values should be
// stored as little endian.
// 		 */
// 		typedef struct
// 		{
// 			uint8_t  bLength; /**< Size of the descriptor, in bytes.
// */ 			uint8_t  bDescriptorType; /**< Type of the descriptor,
// either a value in \ref USB_DescriptorTypes_t or a
// 			                           *   value given by the
// specific class.
// 			                           */
// 			uint8_t  bEndpointAddress; /**< Logical address of the
// endpoint within the device for the current
// 			                            *   configuration, including
// direction mask.
// 			                            */
// 			uint8_t  bmAttributes; /**< Endpoint attributes,
// comprised of a mask of the endpoint type (EP_TYPE_*)
// 			                        *   and attributes
// (ENDPOINT_ATTR_*) masks.
// 			                        */
// 			uint16_t wMaxPacketSize; /**< Size of the endpoint bank,
// in bytes. This indicates the maximum packet size
// 			                          *   that the endpoint can
// receive at a time.
// 			                          */
// 			uint8_t  bInterval; /**< Polling interval in
// milliseconds for the endpoint if it is an INTERRUPT or
// 			                     *   ISOCHRONOUS type.
// 			                     */
// 		} ATTR_PACKED USB_StdDescriptor_Endpoint_t;

/** \brief Standard USB String Descriptor (LUFA naming conventions).
 *
 *  Type define for a standard string descriptor. Unlike other standard
 * descriptors, the length of the descriptor for placement in the descriptor
 * header must be determined by the \ref USB_STRING_LEN() macro rather than by
 * the size of the descriptor structure, as the length is not fixed.
 *
 *  This structure should also be used for string index 0, which contains the
 * supported language IDs for the device as an array.
 *
 *  This structure uses LUFA-specific element names to make each element's
 * purpose clearer.
 *
 *  \see \ref USB_StdDescriptor_String_t for the version of this type with
 * standard element names.
 *
 *  \note Regardless of CPU architecture, these values should be stored as
 * little endian.
 */
typedef struct {
  USB_Descriptor_Header_t
      Header; /**< Descriptor header, including type and size. */

  uint16_t
      UnicodeString[]; /**< String data, as unicode characters (alternatively,
                        *   string language IDs). If normal ASCII characters are
                        *   to be used, they must be added as an array of
                        * characters rather than a normal C string so that they
                        * are widened to Unicode size.
                        *
                        *   Under GCC, strings prefixed with the "L" character
                        * (before the opening string quotation mark) are
                        * considered to be Unicode strings, and may be used
                        * instead of an explicit array of ASCII characters on
                        * little endian devices with UTF-16-LE \c wchar_t
                        * encoding.
                        */
} USB_Descriptor_String_t;

// 		/** \brief Standard USB String Descriptor (USB-IF naming
// conventions).
// 		 *
// 		 *  Type define for a standard string descriptor. Unlike other
// standard descriptors, the length
// 		 *  of the descriptor for placement in the descriptor header
// must be determined by the \ref USB_STRING_LEN()
// 		 *  macro rather than by the size of the descriptor structure,
// as the length is not fixed.
// 		 *
// 		 *  This structure should also be used for string index 0, which
// contains the supported language IDs for
// 		 *  the device as an array.
// 		 *
// 		 *  This structure uses the relevant standard's given element
// names to ensure compatibility with the standard.
// 		 *
// 		 *  \see \ref USB_Descriptor_String_t for the version of this
// type with with non-standard LUFA specific
// 		 *       element names.
// 		 *
// 		 *  \note Regardless of CPU architecture, these values should be
// stored as little endian.
// 		 */
// 		typedef struct
// 		{
// 			uint8_t bLength; /**< Size of the descriptor, in bytes.
// */ 			uint8_t bDescriptorType; /**< Type of the descriptor,
// either a value in \ref USB_DescriptorTypes_t
// 			                          *   or a value given by the
// specific class.
// 			                          */
// 			uint16_t bString[]; /**< String data, as unicode
// characters (alternatively, string language IDs).
// 			                     *   If normal ASCII characters are
// to be used, they must be added as an array
// 			                     *   of characters rather than a
// normal C string so that they are widened to
// 			                     *   Unicode size.
// 			                     *
// 			                     *   Under GCC, strings prefixed
// with the "L" character (before the opening string
// 			                     *   quotation mark) are considered
// to be Unicode strings, and may be used instead
// 			                     *   of an explicit array of ASCII
// characters.
// 			                     */
// 		} ATTR_PACKED USB_StdDescriptor_String_t;

// /* Disable C linkage for C++ Compilers: */
// 	#if defined(__cplusplus)
// 		}
// 	#endif

#endif