LXR linux/drivers/usb/gadget/function/u

   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
  37struct 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
  47struct 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
  59struct 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
  75int gaudio_setup(struct gaudio *card);
  76void gaudio_cleanup(struct gaudio *the_card);
  77
  78size_t u_audio_playback(struct gaudio *card, void *buf, size_t count);
  79int u_audio_get_playback_channels(struct gaudio *card);
  80int u_audio_get_playback_rate(struct gaudio *card);
  81
  82#endif /* __U_AUDIO_H */
  83