blob: 8cb025fef6346a63270cd55a8de69b3b93a49006 [file] [log] [blame]
Ben Williamsonf2ebf92c2006-08-01 11:28:16 +10001/*
2 * <linux/usb/audio.h> -- USB Audio definitions.
3 *
4 * Copyright (C) 2006 Thumtronics Pty Ltd.
5 * Developed for Thumtronics by Grey Innovation
6 * Ben Williamson <ben.williamson@greyinnovation.com>
7 *
8 * This software is distributed under the terms of the GNU General Public
9 * License ("GPL") version 2, as published by the Free Software Foundation.
10 *
11 * This file holds USB constants and structures defined
12 * by the USB Device Class Definition for Audio Devices.
13 * Comments below reference relevant sections of that document:
14 *
15 * http://www.usb.org/developers/devclass_docs/audio10.pdf
16 */
17
18#ifndef __LINUX_USB_AUDIO_H
19#define __LINUX_USB_AUDIO_H
20
21#include <linux/types.h>
22
23/* A.2 Audio Interface Subclass Codes */
24#define USB_SUBCLASS_AUDIOCONTROL 0x01
25#define USB_SUBCLASS_AUDIOSTREAMING 0x02
26#define USB_SUBCLASS_MIDISTREAMING 0x03
27
28/* 4.3.2 Class-Specific AC Interface Descriptor */
29struct usb_ac_header_descriptor {
Greg Kroah-Hartman41dceed2008-01-30 15:21:33 -080030 __u8 bLength; /* 8+n */
31 __u8 bDescriptorType; /* USB_DT_CS_INTERFACE */
32 __u8 bDescriptorSubtype; /* USB_MS_HEADER */
33 __le16 bcdADC; /* 0x0100 */
34 __le16 wTotalLength; /* includes Unit and Terminal desc. */
35 __u8 bInCollection; /* n */
36 __u8 baInterfaceNr[]; /* [n] */
Ben Williamsonf2ebf92c2006-08-01 11:28:16 +100037} __attribute__ ((packed));
38
39#define USB_DT_AC_HEADER_SIZE(n) (8+(n))
40
41/* As above, but more useful for defining your own descriptors: */
42#define DECLARE_USB_AC_HEADER_DESCRIPTOR(n) \
43struct usb_ac_header_descriptor_##n { \
44 __u8 bLength; \
45 __u8 bDescriptorType; \
46 __u8 bDescriptorSubtype; \
47 __le16 bcdADC; \
48 __le16 wTotalLength; \
49 __u8 bInCollection; \
50 __u8 baInterfaceNr[n]; \
51} __attribute__ ((packed))
52
Robert P. J. Daydda43a02008-03-07 13:45:32 -050053#endif /* __LINUX_USB_AUDIO_H */