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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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