LXR linux/drivers/usb/gadget/function/u_uac1

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * u_uac1.h -- interface to USB gadget "ALSA AUDIO" utilities
   4 *
   5 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
   6 * Copyright (C) 2008 Analog Devices, Inc
   7 */
   8
   9#ifndef __U_UAC1_LEGACY_H
  10#define __U_UAC1_LEGACY_H
  11
  12#include <linux/device.h>
  13#include <linux/err.h>
  14#include <linux/usb/audio.h>
  15#include <linux/usb/composite.h>
  16
  17#include <sound/core.h>
  18#include <sound/pcm.h>
  19#include <sound/pcm_params.h>
  20
  21#define FILE_PCM_PLAYBACK       "/dev/snd/pcmC0D0p"
  22#define FILE_PCM_CAPTURE        "/dev/snd/pcmC0D0c"
  23#define FILE_CONTROL            "/dev/snd/controlC0"
  24
  25#define UAC1_OUT_EP_MAX_PACKET_SIZE     200
  26#define UAC1_REQ_COUNT                  256
  27#define UAC1_AUDIO_BUF_SIZE             48000
  28
  29/*
  30 * This represents the USB side of an audio card device, managed by a USB
  31 * function which provides control and stream interfaces.
  32 */
  33
  34struct gaudio_snd_dev {
  35        struct gaudio                   *card;
  36        struct file                     *filp;
  37        struct snd_pcm_substream        *substream;
  38        int                             access;
  39        int                             format;
  40        int                             channels;
  41        int                             rate;
  42};
  43
  44struct gaudio {
  45        struct usb_function             func;
  46        struct usb_gadget               *gadget;
  47
  48        /* ALSA sound device interfaces */
  49        struct gaudio_snd_dev           control;
  50        struct gaudio_snd_dev           playback;
  51        struct gaudio_snd_dev           capture;
  52
  53        /* TODO */
  54};
  55
  56struct f_uac1_legacy_opts {
  57        struct usb_function_instance    func_inst;
  58        int                             req_buf_size;
  59        int                             req_count;
  60        int                             audio_buf_size;
  61        char                            *fn_play;
  62        char                            *fn_cap;
  63        char                            *fn_cntl;
  64        unsigned                        bound:1;
  65        unsigned                        fn_play_alloc:1;
  66        unsigned                        fn_cap_alloc:1;
  67        unsigned                        fn_cntl_alloc:1;
  68        struct mutex                    lock;
  69        int                             refcnt;
  70};
  71
  72int gaudio_setup(struct gaudio *card);
  73void gaudio_cleanup(struct gaudio *the_card);
  74
  75size_t u_audio_playback(struct gaudio *card, void *buf, size_t count);
  76int u_audio_get_playback_channels(struct gaudio *card);
  77int u_audio_get_playback_rate(struct gaudio *card);
  78
  79#endif /* __U_UAC1_LEGACY_H */
  80