c6994e6f06
Funtions added: - setup all the USB audio class device descriptors - handle class specific setup request - receive data from USB host by ISO transfer - play audio data by ALSA sound card - open and setup playback PCM interface - set default playback PCM parameters - provide playback functions for USB audio driver - provide PCM parameters set/get functions Test on: - Host: Ubuntu 8.10, kernel 2.6.27 - Gadget: EZKIT-BF548 with ASoC AD1980 codec Todo: - add real Mute control code - add real Volume control code - maybe find another way to replace dynamic buffer handling with static buffer allocation - test on Windows system - provide control interface to handle mute/volume control - provide capture interface in the future - test on BF527, other USB device controler and other audio codec Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
/*
|
|
* u_audio.h -- interface to USB gadget "ALSA AUDIO" utilities
|
|
*
|
|
* Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
|
|
* Copyright (C) 2008 Analog Devices, Inc
|
|
*
|
|
* Enter bugs at http://blackfin.uclinux.org/
|
|
*
|
|
* 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(struct gaudio *card);
|
|
|
|
#endif /* __U_AUDIO_H */
|