drivers/usb/gadget/u_audio.h

   1 /*
   2  * u_audio.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 /*
  27  * This represents the USB side of an audio card device, managed by a USB
  28  * function which provides control and stream interfaces.
  29  */
  30
  31 struct gaudio_snd_dev {
  32         struct gaudio                   *card;
  33         struct file                     *filp;
  34         struct snd_pcm_substream        *substream;
  35         int                             access;
  36         int                             format;
  37         int                             channels;
  38         int                             rate;
  39 };
  40
  41 struct gaudio {
  42         struct usb_function             func;
  43         struct usb_gadget               *gadget;
  44
  45         /* ALSA sound device interfaces */
  46         struct gaudio_snd_dev           control;
  47         struct gaudio_snd_dev           playback;
  48         struct gaudio_snd_dev           capture;
  49
  50         /* TODO */
  51 };
  52
  53 int gaudio_setup(struct gaudio *card);
  54 void gaudio_cleanup(void);
  55
  56 #endif /* __U_AUDIO_H */