ff-midi.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * ff-midi.c - a part of driver for RME Fireface series
  4 *
  5 * Copyright (c) 2015-2017 Takashi Sakamoto
  6 */
  7
  8#include "ff.h"
  9
 10static int midi_capture_open(struct snd_rawmidi_substream *substream)
 11{
 12	/* Do nothing. */
 13	return 0;
 14}
 15
 16static int midi_playback_open(struct snd_rawmidi_substream *substream)
 17{
 18	struct snd_ff *ff = substream->rmidi->private_data;
 19
 20	/* Initialize internal status. */
 21	ff->on_sysex[substream->number] = 0;
 22	ff->rx_midi_error[substream->number] = false;
 23
 24	WRITE_ONCE(ff->rx_midi_substreams[substream->number], substream);
 25
 26	return 0;
 27}
 28
 29static int midi_capture_close(struct snd_rawmidi_substream *substream)
 30{
 31	/* Do nothing. */
 32	return 0;
 33}
 34
 35static int midi_playback_close(struct snd_rawmidi_substream *substream)
 36{
 37	struct snd_ff *ff = substream->rmidi->private_data;
 38
 39	cancel_work_sync(&ff->rx_midi_work[substream->number]);
 40	WRITE_ONCE(ff->rx_midi_substreams[substream->number], NULL);
 41
 42	return 0;
 43}
 44
 45static void midi_capture_trigger(struct snd_rawmidi_substream *substream,
 46				 int up)
 47{
 48	struct snd_ff *ff = substream->rmidi->private_data;
 49
 50	guard(spinlock_irqsave)(&ff->lock);
 51
 52	if (up)
 53		WRITE_ONCE(ff->tx_midi_substreams[substream->number],
 54			   substream);
 55	else
 56		WRITE_ONCE(ff->tx_midi_substreams[substream->number], NULL);
 57}
 58
 59static void midi_playback_trigger(struct snd_rawmidi_substream *substream,
 60				  int up)
 61{
 62	struct snd_ff *ff = substream->rmidi->private_data;
 63
 64	guard(spinlock_irqsave)(&ff->lock);
 65
 66	if (up || !ff->rx_midi_error[substream->number])
 67		schedule_work(&ff->rx_midi_work[substream->number]);
 68}
 69
 70static void set_midi_substream_names(struct snd_rawmidi_str *stream,
 71				     const char *const name)
 72{
 73	struct snd_rawmidi_substream *substream;
 74
 75	list_for_each_entry(substream, &stream->substreams, list) {
 76		scnprintf(substream->name, sizeof(substream->name),
 77			  "%s MIDI %d", name, substream->number + 1);
 78	}
 79}
 80
 81int snd_ff_create_midi_devices(struct snd_ff *ff)
 82{
 83	static const struct snd_rawmidi_ops midi_capture_ops = {
 84		.open		= midi_capture_open,
 85		.close		= midi_capture_close,
 86		.trigger	= midi_capture_trigger,
 87	};
 88	static const struct snd_rawmidi_ops midi_playback_ops = {
 89		.open		= midi_playback_open,
 90		.close		= midi_playback_close,
 91		.trigger	= midi_playback_trigger,
 92	};
 93	struct snd_rawmidi *rmidi;
 94	struct snd_rawmidi_str *stream;
 95	int err;
 96
 97	err = snd_rawmidi_new(ff->card, ff->card->driver, 0,
 98			      ff->spec->midi_out_ports, ff->spec->midi_in_ports,
 99			      &rmidi);
100	if (err < 0)
101		return err;
102
103	snprintf(rmidi->name, sizeof(rmidi->name),
104		 "%s MIDI", ff->card->shortname);
105	rmidi->private_data = ff;
106
107	rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
108	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
109			    &midi_capture_ops);
110	stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
111	set_midi_substream_names(stream, ff->card->shortname);
112
113	rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
114	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
115			    &midi_playback_ops);
116	stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
117	set_midi_substream_names(stream, ff->card->shortname);
118
119	rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
120
121	return 0;
122}