54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/*
|
|
* <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
|