kernel/drivers/usb/gadget/function/u_uac1.h

   1 /*
   2  * u_uac1.h -- interface to USB gadget "ALSA AUDIO" utilities
   3  *
   4  * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
   5  * Copyright (C) 2008 Analog Devices, Inc
   6  *
   7  * Enter bugs at http://blackfin.uclinux.org/
   8  *
   9  * Licensed under the GPL-2 or later.
  10  */
  11
  12 #ifndef __U_AUDIO_H
  13 #define __U_AUDIO_H
  14
  15 #include <linux/device.h>
  16 #include <linux/err.h>
  17 #include <linux/usb/audio.h>
  18 #include <linux/usb/composite.h>
  19
  20 #include <sound/core.h>
  21 #include <sound/pcm.h>
  22 #include <sound/pcm_params.h>
  23
  24 #include "gadget_chips.h"
  25
  26 #define FILE_PCM_PLAYBACK       "/dev/snd/pcmC0D0p"
  27 #define FILE_PCM_CAPTURE        "/dev/snd/pcmC0D0c"
  28 #define FILE_CONTROL            "/dev/snd/controlC0"
  29
  30 #define UAC1_OUT_EP_MAX_PACKET_SIZE     200
  31 #define UAC1_REQ_COUNT                  256
  32 #define UAC1_AUDIO_BUF_SIZE             48000
  33
  34 /*
  35  * This represents the USB side of an audio card device, managed by a USB
  36  * function which provides control and stream interfaces.
  37  */
  38
  39 struct gaudio_snd_dev {
  40         struct gaudio                   *card;
  41         struct file                     *filp;
  42         struct snd_pcm_substream        *substream;
  43         int                             access;
  44         int                             format;
  45         int                             channels;
  46         int                             rate;
  47 };
  48
  49 struct gaudio {
  50         struct usb_function             func;
  51         struct usb_gadget               *gadget;
  52
  53         /* ALSA sound device interfaces */
  54         struct gaudio_snd_dev           control;
  55         struct gaudio_snd_dev           playback;
  56         struct gaudio_snd_dev           capture;
  57
  58         /* TODO */
  59 };
  60
  61 struct f_uac1_opts {
  62         struct usb_function_instance    func_inst;
  63         int                             req_buf_size;
  64         int                             req_count;
  65         int                             audio_buf_size;
  66         char                            *fn_play;
  67         char                            *fn_cap;
  68         char                            *fn_cntl;
  69         unsigned                        bound:1;
  70         unsigned                        fn_play_alloc:1;
  71         unsigned                        fn_cap_alloc:1;
  72         unsigned                        fn_cntl_alloc:1;
  73         struct mutex                    lock;
  74         int                             refcnt;
  75 };
  76
  77 int gaudio_setup(struct gaudio *card);
  78 void gaudio_cleanup(struct gaudio *the_card);
  79
  80 size_t u_audio_playback(struct gaudio *card, void *buf, size_t count);
  81 int u_audio_get_playback_channels(struct gaudio *card);
  82 int u_audio_get_playback_rate(struct gaudio *card);
  83
  84 #endif /* __U_AUDIO_H */