blob: 5c2ac8e8456d83cf4c7c462cb45eb5475932c8ad [file] [log] [blame]
* u_uac1.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>
#define FILE_PCM_PLAYBACK "/dev/snd/pcmC0D0p"
#define FILE_PCM_CAPTURE "/dev/snd/pcmC0D0c"
#define FILE_CONTROL "/dev/snd/controlC0"
#define UAC1_REQ_COUNT 256
#define UAC1_AUDIO_BUF_SIZE 48000
* 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 */
struct f_uac1_opts {
struct usb_function_instance func_inst;
int req_buf_size;
int req_count;
int audio_buf_size;
char *fn_play;
char *fn_cap;
char *fn_cntl;
unsigned bound:1;
unsigned fn_play_alloc:1;
unsigned fn_cap_alloc:1;
unsigned fn_cntl_alloc:1;
struct mutex lock;
int refcnt;
int gaudio_setup(struct gaudio *card);
void gaudio_cleanup(struct gaudio *the_card);
size_t u_audio_playback(struct gaudio *card, void *buf, size_t count);
int u_audio_get_playback_channels(struct gaudio *card);
int u_audio_get_playback_rate(struct gaudio *card);
#endif /* __U_AUDIO_H */