sound/usb/line6/midi.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Line 6 Linux USB driver
   4  *
   5  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
   6  */
   7
   8 #ifndef MIDI_H
   9 #define MIDI_H
  10
  11 #include <sound/rawmidi.h>
  12
  13 #include "midibuf.h"
  14
  15 #define MIDI_BUFFER_SIZE 1024
  16
  17 struct snd_line6_midi {
  18         /* Pointer back to the Line 6 driver data structure */
  19         struct usb_line6 *line6;
  20
  21         /* MIDI substream for receiving (or NULL if not active) */
  22         struct snd_rawmidi_substream *substream_receive;
  23
  24         /* MIDI substream for transmitting (or NULL if not active) */
  25         struct snd_rawmidi_substream *substream_transmit;
  26
  27         /* Number of currently active MIDI send URBs */
  28         int num_active_send_urbs;
  29
  30         /* Spin lock to protect MIDI buffer handling */
  31         spinlock_t lock;
  32
  33         /* Wait queue for MIDI transmission */
  34         wait_queue_head_t send_wait;
  35
  36         /* Buffer for incoming MIDI stream */
  37         struct midi_buffer midibuf_in;
  38
  39         /* Buffer for outgoing MIDI stream */
  40         struct midi_buffer midibuf_out;
  41 };
  42
  43 extern int line6_init_midi(struct usb_line6 *line6);
  44 extern void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
  45                                int length);
  46
  47 #endif