linux/sound/usb/line6/midi.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Line 6 Linux USB driver
 *
 * Copyright (C) 2004-2010 Markus Grabner ([email protected])
 */

#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/rawmidi.h>

#include "driver.h"
#include "midi.h"

#define line6_rawmidi_substream_midi(substream) …

static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
			   int length);

/*
	Pass data received via USB to MIDI.
*/
void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
			int length)
{ … }

/*
	Read data from MIDI buffer and transmit them via USB.
*/
static void line6_midi_transmit(struct snd_rawmidi_substream *substream)
{ … }

/*
	Notification of completion of MIDI transmission.
*/
static void midi_sent(struct urb *urb)
{ … }

/*
	Send an asynchronous MIDI message.
	Assumes that line6->line6midi->lock is held
	(i.e., this function is serialized).
*/
static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
			   int length)
{ … }

static int line6_midi_output_open(struct snd_rawmidi_substream *substream)
{ … }

static int line6_midi_output_close(struct snd_rawmidi_substream *substream)
{ … }

static void line6_midi_output_trigger(struct snd_rawmidi_substream *substream,
				      int up)
{ … }

static void line6_midi_output_drain(struct snd_rawmidi_substream *substream)
{ … }

static int line6_midi_input_open(struct snd_rawmidi_substream *substream)
{ … }

static int line6_midi_input_close(struct snd_rawmidi_substream *substream)
{ … }

static void line6_midi_input_trigger(struct snd_rawmidi_substream *substream,
				     int up)
{ … }

static const struct snd_rawmidi_ops line6_midi_output_ops = …;

static const struct snd_rawmidi_ops line6_midi_input_ops = …;

/* Create a MIDI device */
static int snd_line6_new_midi(struct usb_line6 *line6,
			      struct snd_rawmidi **rmidi_ret)
{ … }

/* MIDI device destructor */
static void snd_line6_midi_free(struct snd_rawmidi *rmidi)
{ … }

/*
	Initialize the Line 6 MIDI subsystem.
*/
int line6_init_midi(struct usb_line6 *line6)
{ … }
EXPORT_SYMBOL_GPL(…);