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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
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