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C/C++ Source or Header  |  2008-10-24  |  1.7 KB  |  54 lines
  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 {
  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] */
  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.  
  53. #endif /* __LINUX_USB_AUDIO_H */
  54.