| Ben Williamson | f2ebf92c | 2006-08-01 11:28:16 +1000 | [diff] [blame] | 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 |