1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * motu-midi.h - a part of driver for MOTU FireWire series
4 *
5 * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
6 */
7#include "motu.h"
8
9static int midi_open(struct snd_rawmidi_substream *substream)
10{
11 struct snd_motu *motu = substream->rmidi->private_data;
12 int err;
13
14 err = snd_motu_stream_lock_try(motu);
15 if (err < 0)
16 return err;
17
18 mutex_lock(&motu->mutex);
19
20 err = snd_motu_stream_reserve_duplex(motu, rate: 0, frames_per_period: 0, frames_per_buffer: 0);
21 if (err >= 0) {
22 ++motu->substreams_counter;
23 err = snd_motu_stream_start_duplex(motu);
24 if (err < 0)
25 --motu->substreams_counter;
26 }
27
28 mutex_unlock(lock: &motu->mutex);
29
30 if (err < 0)
31 snd_motu_stream_lock_release(motu);
32
33 return err;
34}
35
36static int midi_close(struct snd_rawmidi_substream *substream)
37{
38 struct snd_motu *motu = substream->rmidi->private_data;
39
40 mutex_lock(&motu->mutex);
41
42 --motu->substreams_counter;
43 snd_motu_stream_stop_duplex(motu);
44
45 mutex_unlock(lock: &motu->mutex);
46
47 snd_motu_stream_lock_release(motu);
48 return 0;
49}
50
51static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
52{
53 struct snd_motu *motu = substrm->rmidi->private_data;
54 unsigned long flags;
55
56 spin_lock_irqsave(&motu->lock, flags);
57
58 if (up)
59 amdtp_motu_midi_trigger(s: &motu->tx_stream, port: substrm->number,
60 midi: substrm);
61 else
62 amdtp_motu_midi_trigger(s: &motu->tx_stream, port: substrm->number,
63 NULL);
64
65 spin_unlock_irqrestore(lock: &motu->lock, flags);
66}
67
68static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
69{
70 struct snd_motu *motu = substrm->rmidi->private_data;
71 unsigned long flags;
72
73 spin_lock_irqsave(&motu->lock, flags);
74
75 if (up)
76 amdtp_motu_midi_trigger(s: &motu->rx_stream, port: substrm->number,
77 midi: substrm);
78 else
79 amdtp_motu_midi_trigger(s: &motu->rx_stream, port: substrm->number,
80 NULL);
81
82 spin_unlock_irqrestore(lock: &motu->lock, flags);
83}
84
85static void set_midi_substream_names(struct snd_motu *motu,
86 struct snd_rawmidi_str *str)
87{
88 struct snd_rawmidi_substream *subs;
89
90 list_for_each_entry(subs, &str->substreams, list) {
91 scnprintf(buf: subs->name, size: sizeof(subs->name),
92 fmt: "%s MIDI %d", motu->card->shortname, subs->number + 1);
93 }
94}
95
96int snd_motu_create_midi_devices(struct snd_motu *motu)
97{
98 static const struct snd_rawmidi_ops capture_ops = {
99 .open = midi_open,
100 .close = midi_close,
101 .trigger = midi_capture_trigger,
102 };
103 static const struct snd_rawmidi_ops playback_ops = {
104 .open = midi_open,
105 .close = midi_close,
106 .trigger = midi_playback_trigger,
107 };
108 struct snd_rawmidi *rmidi;
109 struct snd_rawmidi_str *str;
110 int err;
111
112 /* create midi ports */
113 err = snd_rawmidi_new(card: motu->card, id: motu->card->driver, device: 0, output_count: 1, input_count: 1, rmidi: &rmidi);
114 if (err < 0)
115 return err;
116
117 snprintf(buf: rmidi->name, size: sizeof(rmidi->name),
118 fmt: "%s MIDI", motu->card->shortname);
119 rmidi->private_data = motu;
120
121 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT |
122 SNDRV_RAWMIDI_INFO_OUTPUT |
123 SNDRV_RAWMIDI_INFO_DUPLEX;
124
125 snd_rawmidi_set_ops(rmidi, stream: SNDRV_RAWMIDI_STREAM_INPUT,
126 ops: &capture_ops);
127 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
128 set_midi_substream_names(motu, str);
129
130 snd_rawmidi_set_ops(rmidi, stream: SNDRV_RAWMIDI_STREAM_OUTPUT,
131 ops: &playback_ops);
132 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
133 set_midi_substream_names(motu, str);
134
135 return 0;
136}
137

source code of linux/sound/firewire/motu/motu-midi.c