drivers/staging/line6/midi.h

   1 /*
   2  * Line6 Linux USB driver - 0.8.0
   3  *
   4  * Copyright (C) 2004-2009 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
  16 #include <sound/rawmidi.h>
  17
  18 #include "midibuf.h"
  19
  20
  21 #define MIDI_BUFFER_SIZE 1024
  22
  23
  24 struct snd_line6_midi {
  25         /**
  26                  Pointer back to the Line6 driver data structure.
  27         */
  28         struct usb_line6 *line6;
  29
  30         /**
  31                  MIDI substream for receiving (or NULL if not active).
  32         */
  33         struct snd_rawmidi_substream *substream_receive;
  34
  35         /**
  36                  MIDI substream for transmitting (or NULL if not active).
  37         */
  38         struct snd_rawmidi_substream *substream_transmit;
  39
  40         /**
  41                  Number of currently active MIDI send URBs.
  42         */
  43         int num_active_send_urbs;
  44
  45         /**
  46                  Spin lock to protect updates of send_urb.
  47         */
  48         spinlock_t send_urb_lock;
  49
  50         /**
  51                  Spin lock to protect MIDI buffer handling.
  52         */
  53         spinlock_t midi_transmit_lock;
  54
  55         /**
  56                  Wait queue for MIDI transmission.
  57         */
  58         wait_queue_head_t send_wait;
  59
  60         /**
  61                  Bit mask for output MIDI channels.
  62         */
  63         int midi_mask_transmit;
  64
  65         /**
  66                  Bit mask for input MIDI channels.
  67         */
  68         int midi_mask_receive;
  69
  70         /**
  71                  Buffer for incoming MIDI stream.
  72         */
  73         struct MidiBuffer midibuf_in;
  74
  75         /**
  76                  Buffer for outgoing MIDI stream.
  77         */
  78         struct MidiBuffer midibuf_out;
  79 };
  80
  81
  82 extern int line6_init_midi(struct usb_line6 *line6);
  83 extern void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
  84                                int length);
  85
  86
  87 #endif