/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * u_uac1.h -- interface to USB gadget "ALSA AUDIO" utilities
 *
 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
 * Copyright (C) 2008 Analog Devices, Inc
 */

#ifndef __U_UAC1_LEGACY_H
#define __U_UAC1_LEGACY_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_OUT_EP_MAX_PACKET_SIZE     200
#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_legacy_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_UAC1_LEGACY_H */