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	unsigned long flags;
50
51	spin_lock_irqsave(&ff->lock, flags);
52
53	if (up)
54		WRITE_ONCE(ff->tx_midi_substreams[substream->number],
55			   substream);
56	else
57		WRITE_ONCE(ff->tx_midi_substreams[substream->number], NULL);
58
59	spin_unlock_irqrestore(&ff->lock, flags);
60}
61
62static void midi_playback_trigger(struct snd_rawmidi_substream *substream,
63				  int up)
64{
65	struct snd_ff *ff = substream->rmidi->private_data;
66	unsigned long flags;
67
68	spin_lock_irqsave(&ff->lock, flags);
69
70	if (up || !ff->rx_midi_error[substream->number])
71		schedule_work(&ff->rx_midi_work[substream->number]);
72
73	spin_unlock_irqrestore(&ff->lock, flags);
74}
75
76static void set_midi_substream_names(struct snd_rawmidi_str *stream,
77				     const char *const name)
78{
79	struct snd_rawmidi_substream *substream;
80
81	list_for_each_entry(substream, &stream->substreams, list) {
82		scnprintf(substream->name, sizeof(substream->name),
83			  "%s MIDI %d", name, substream->number + 1);
84	}
85}
86
87int snd_ff_create_midi_devices(struct snd_ff *ff)
88{
89	static const struct snd_rawmidi_ops midi_capture_ops = {
90		.open		= midi_capture_open,
91		.close		= midi_capture_close,
92		.trigger	= midi_capture_trigger,
93	};
94	static const struct snd_rawmidi_ops midi_playback_ops = {
95		.open		= midi_playback_open,
96		.close		= midi_playback_close,
97		.trigger	= midi_playback_trigger,
98	};
99	struct snd_rawmidi *rmidi;
100	struct snd_rawmidi_str *stream;
101	int err;
102
103	err = snd_rawmidi_new(ff->card, ff->card->driver, 0,
104			      ff->spec->midi_out_ports, ff->spec->midi_in_ports,
105			      &rmidi);
106	if (err < 0)
107		return err;
108
109	snprintf(rmidi->name, sizeof(rmidi->name),
110		 "%s MIDI", ff->card->shortname);
111	rmidi->private_data = ff;
112
113	rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
114	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
115			    &midi_capture_ops);
116	stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
117	set_midi_substream_names(stream, ff->card->shortname);
118
119	rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
120	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
121			    &midi_playback_ops);
122	stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
123	set_midi_substream_names(stream, ff->card->shortname);
124
125	rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
126
127	return 0;
128}
129