/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* u_uac1.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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#ifndef __U_UAC1_LEGACY_H
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#define __U_UAC1_LEGACY_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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#define FILE_PCM_PLAYBACK "/dev/snd/pcmC0D0p"
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#define FILE_PCM_CAPTURE "/dev/snd/pcmC0D0c"
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#define FILE_CONTROL "/dev/snd/controlC0"
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#define UAC1_OUT_EP_MAX_PACKET_SIZE 200
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#define UAC1_REQ_COUNT 256
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#define UAC1_AUDIO_BUF_SIZE 48000
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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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struct f_uac1_legacy_opts {
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struct usb_function_instance func_inst;
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int req_buf_size;
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int req_count;
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int audio_buf_size;
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char *fn_play;
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char *fn_cap;
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char *fn_cntl;
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unsigned bound:1;
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unsigned fn_play_alloc:1;
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unsigned fn_cap_alloc:1;
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unsigned fn_cntl_alloc:1;
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struct mutex lock;
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int refcnt;
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};
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int gaudio_setup(struct gaudio *card);
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void gaudio_cleanup(struct gaudio *the_card);
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size_t u_audio_playback(struct gaudio *card, void *buf, size_t count);
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int u_audio_get_playback_channels(struct gaudio *card);
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int u_audio_get_playback_rate(struct gaudio *card);
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#endif /* __U_UAC1_LEGACY_H */
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