LXR linux/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
  17struct 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
  43extern int line6_init_midi(struct usb_line6 *line6);
  44extern void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
  45                               int length);
  46
  47#endif
  48