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 #define FILE_PCM_PLAYBACK       "/dev/snd/pcmC0D0p"
  25 #define FILE_PCM_CAPTURE        "/dev/snd/pcmC0D0c"
  26 #define FILE_CONTROL            "/dev/snd/controlC0"
  27
  28 #define UAC1_OUT_EP_MAX_PACKET_SIZE     200
  29 #define UAC1_REQ_COUNT                  256
  30 #define UAC1_AUDIO_BUF_SIZE             48000
  31
  32 /*
  33  * This represents the USB side of an audio card device, managed by a USB
  34  * function which provides control and stream interfaces.
  35  */
  36
  37 struct gaudio_snd_dev {
  38         struct gaudio                   *card;
  39         struct file                     *filp;
  40         struct snd_pcm_substream        *substream;
  41         int                             access;
  42         int                             format;
  43         int                             channels;
  44         int                             rate;
  45 };
  46
  47 struct gaudio {
  48         struct usb_function             func;
  49         struct usb_gadget               *gadget;
  50
  51         /* ALSA sound device interfaces */
  52         struct gaudio_snd_dev           control;
  53         struct gaudio_snd_dev           playback;
  54         struct gaudio_snd_dev           capture;
  55
  56         /* TODO */
  57 };
  58
  59 struct f_uac1_opts {
  60         struct usb_function_instance    func_inst;
  61         int                             req_buf_size;
  62         int                             req_count;
  63         int                             audio_buf_size;
  64         char                            *fn_play;
  65         char                            *fn_cap;
  66         char                            *fn_cntl;
  67         unsigned                        bound:1;
  68         unsigned                        fn_play_alloc:1;
  69         unsigned                        fn_cap_alloc:1;
  70         unsigned                        fn_cntl_alloc:1;
  71         struct mutex                    lock;
  72         int                             refcnt;
  73 };
  74
  75 int gaudio_setup(struct gaudio *card);
  76 void gaudio_cleanup(struct gaudio *the_card);
  77
  78 size_t u_audio_playback(struct gaudio *card, void *buf, size_t count);
  79 int u_audio_get_playback_channels(struct gaudio *card);
  80 int u_audio_get_playback_rate(struct gaudio *card);
  81
  82 #endif /* __U_AUDIO_H */