drivers/usb/gadget/function/u_uac1_legacy.h

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