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/*

 * <linux/usb/audio.h> -- USB Audio definitions.

 *

 * Copyright (C) 2006 Thumtronics Pty Ltd.

 * Developed for Thumtronics by Grey Innovation

 * Ben Williamson <ben.williamson@greyinnovation.com>

 *

 * This software is distributed under the terms of the GNU General Public

 * License ("GPL") version 2, as published by the Free Software Foundation.

 *

 * This file holds USB constants and structures defined

 * by the USB Device Class Definition for Audio Devices.

 * Comments below reference relevant sections of that document:

 *

 * http://www.usb.org/developers/devclass_docs/audio10.pdf

 */

#ifndef __LINUX_USB_AUDIO_H

#define __LINUX_USB_AUDIO_H

#include <linux/types.h>

/* A.2 Audio Interface Subclass Codes */

#define USB_SUBCLASS_AUDIOCONTROL       0x01

#define USB_SUBCLASS_AUDIOSTREAMING     0x02

#define USB_SUBCLASS_MIDISTREAMING      0x03

/* 4.3.2  Class-Specific AC Interface Descriptor */

struct usb_ac_header_descriptor {

        __u8  bLength;                  // 8+n

        __u8  bDescriptorType;          // USB_DT_CS_INTERFACE

        __u8  bDescriptorSubtype;       // USB_MS_HEADER

        __le16 bcdADC;                  // 0x0100

        __le16 wTotalLength;            // includes Unit and Terminal desc.

        __u8  bInCollection;            // n

        __u8  baInterfaceNr[];          // [n]

} __attribute__ ((packed));

#define USB_DT_AC_HEADER_SIZE(n)        (8+(n))

/* As above, but more useful for defining your own descriptors: */

#define DECLARE_USB_AC_HEADER_DESCRIPTOR(n)                     \

struct usb_ac_header_descriptor_##n {                           \

        __u8  bLength;                                          \

        __u8  bDescriptorType;                                  \

        __u8  bDescriptorSubtype;                               \

        __le16 bcdADC;                                          \

        __le16 wTotalLength;                                    \

        __u8  bInCollection;                                    \

        __u8  baInterfaceNr[n];                                 \

} __attribute__ ((packed))

#endif