root/sound/usb/line6/midi.h

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INCLUDED FROM


   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

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