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