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54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
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/*
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* <linux/usb/audio.h> -- USB Audio definitions.
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*
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* Copyright (C) 2006 Thumtronics Pty Ltd.
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* Developed for Thumtronics by Grey Innovation
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* Ben Williamson <ben.williamson@greyinnovation.com>
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*
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* This software is distributed under the terms of the GNU General Public
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* License ("GPL") version 2, as published by the Free Software Foundation.
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*
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* This file holds USB constants and structures defined
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* by the USB Device Class Definition for Audio Devices.
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* Comments below reference relevant sections of that document:
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*
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* http://www.usb.org/developers/devclass_docs/audio10.pdf
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*/
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#ifndef __LINUX_USB_AUDIO_H
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#define __LINUX_USB_AUDIO_H
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#include <linux/types.h>
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/* A.2 Audio Interface Subclass Codes */
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#define USB_SUBCLASS_AUDIOCONTROL 0x01
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#define USB_SUBCLASS_AUDIOSTREAMING 0x02
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#define USB_SUBCLASS_MIDISTREAMING 0x03
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/* 4.3.2 Class-Specific AC Interface Descriptor */
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struct usb_ac_header_descriptor {
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__u8 bLength; // 8+n
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__u8 bDescriptorType; // USB_DT_CS_INTERFACE
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__u8 bDescriptorSubtype; // USB_MS_HEADER
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__le16 bcdADC; // 0x0100
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__le16 wTotalLength; // includes Unit and Terminal desc.
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__u8 bInCollection; // n
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__u8 baInterfaceNr[]; // [n]
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} __attribute__ ((packed));
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#define USB_DT_AC_HEADER_SIZE(n) (8+(n))
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/* As above, but more useful for defining your own descriptors: */
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#define DECLARE_USB_AC_HEADER_DESCRIPTOR(n) \
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struct usb_ac_header_descriptor_##n { \
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__u8 bLength; \
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__u8 bDescriptorType; \
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__u8 bDescriptorSubtype; \
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__le16 bcdADC; \
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__le16 wTotalLength; \
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__u8 bInCollection; \
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__u8 baInterfaceNr[n]; \
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} __attribute__ ((packed))
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#endif
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