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1 | /* |
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 */ | |
29 | struct usb_ac_header_descriptor { | |
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30 | __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] */ | |
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37 | } __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) \ | |
43 | struct 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 | ||
dda43a0e | 53 | #endif /* __LINUX_USB_AUDIO_H */ |