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* u_audio.h -- interface to USB gadget "ALSA AUDIO" utilities
* Copyright (C) 2008 Bryan Wu <>
* Copyright (C) 2008 Analog Devices, Inc
* Enter bugs at
* Licensed under the GPL-2 or later.
#ifndef __U_AUDIO_H
#define __U_AUDIO_H
#include <linux/device.h>
#include <linux/err.h>
#include <linux/usb/audio.h>
#include <linux/usb/composite.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "gadget_chips.h"
* This represents the USB side of an audio card device, managed by a USB
* function which provides control and stream interfaces.
struct gaudio_snd_dev {
struct gaudio *card;
struct file *filp;
struct snd_pcm_substream *substream;
int access;
int format;
int channels;
int rate;
struct gaudio {
struct usb_function func;
struct usb_gadget *gadget;
/* ALSA sound device interfaces */
struct gaudio_snd_dev control;
struct gaudio_snd_dev playback;
struct gaudio_snd_dev capture;
/* TODO */
int gaudio_setup(struct gaudio *card);
void gaudio_cleanup(void);
#endif /* __U_AUDIO_H */