drivers/staging/line6/midi.h

   1 /*
   2  * Line6 Linux USB driver - 0.9.1beta
   3  *
   4  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License as
   8  *      published by the Free Software Foundation, version 2.
   9  *
  10  */
  11
  12 #ifndef MIDI_H
  13 #define MIDI_H
  14
  15 #include <sound/rawmidi.h>
  16
  17 #include "midibuf.h"
  18
  19 #define MIDI_BUFFER_SIZE 1024
  20
  21 struct snd_line6_midi {
  22         /**
  23                  Pointer back to the Line6 driver data structure.
  24         */
  25         struct usb_line6 *line6;
  26
  27         /**
  28                  MIDI substream for receiving (or NULL if not active).
  29         */
  30         struct snd_rawmidi_substream *substream_receive;
  31
  32         /**
  33                  MIDI substream for transmitting (or NULL if not active).
  34         */
  35         struct snd_rawmidi_substream *substream_transmit;
  36
  37         /**
  38                  Number of currently active MIDI send URBs.
  39         */
  40         int num_active_send_urbs;
  41
  42         /**
  43                  Spin lock to protect updates of send_urb.
  44         */
  45         spinlock_t send_urb_lock;
  46
  47         /**
  48                  Spin lock to protect MIDI buffer handling.
  49         */
  50         spinlock_t midi_transmit_lock;
  51
  52         /**
  53                  Wait queue for MIDI transmission.
  54         */
  55         wait_queue_head_t send_wait;
  56
  57         /**
  58                  Buffer for incoming MIDI stream.
  59         */
  60         struct midi_buffer midibuf_in;
  61
  62         /**
  63                  Buffer for outgoing MIDI stream.
  64         */
  65         struct midi_buffer midibuf_out;
  66 };
  67
  68 extern int line6_init_midi(struct usb_line6 *line6);
  69 extern void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
  70                                int length);
  71
  72 #endif