| /* |
| * <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 |