1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * bebob_midi.c - a part of driver for BeBoB based devices
4 *
5 * Copyright (c) 2013-2014 Takashi Sakamoto
6 */
7
8 #include "bebob.h"
9
10 static int midi_open(struct snd_rawmidi_substream *substream)
11 {
12 struct snd_bebob *bebob = substream->rmidi->private_data;
13 int err;
14
15 err = snd_bebob_stream_lock_try(bebob);
16 if (err < 0)
17 return err;
18
19 mutex_lock(&bebob->mutex);
20 err = snd_bebob_stream_reserve_duplex(bebob, 0, 0, 0);
21 if (err >= 0) {
22 ++bebob->substreams_counter;
23 err = snd_bebob_stream_start_duplex(bebob);
24 if (err < 0)
25 --bebob->substreams_counter;
26 }
27 mutex_unlock(&bebob->mutex);
28 if (err < 0)
29 snd_bebob_stream_lock_release(bebob);
30
31 return err;
32 }
33
34 static int midi_close(struct snd_rawmidi_substream *substream)
35 {
36 struct snd_bebob *bebob = substream->rmidi->private_data;
37
38 mutex_lock(&bebob->mutex);
39 bebob->substreams_counter--;
40 snd_bebob_stream_stop_duplex(bebob);
41 mutex_unlock(&bebob->mutex);
42
43 snd_bebob_stream_lock_release(bebob);
44 return 0;
45 }
46
47 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
48 {
49 struct snd_bebob *bebob = substrm->rmidi->private_data;
50 unsigned long flags;
51
52 spin_lock_irqsave(&bebob->lock, flags);
53
54 if (up)
55 amdtp_am824_midi_trigger(&bebob->tx_stream,
56 substrm->number, substrm);
57 else
58 amdtp_am824_midi_trigger(&bebob->tx_stream,
59 substrm->number, NULL);
60
61 spin_unlock_irqrestore(&bebob->lock, flags);
62 }
63
64 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
65 {
66 struct snd_bebob *bebob = substrm->rmidi->private_data;
67 unsigned long flags;
68
69 spin_lock_irqsave(&bebob->lock, flags);
70
71 if (up)
72 amdtp_am824_midi_trigger(&bebob->rx_stream,
73 substrm->number, substrm);
74 else
75 amdtp_am824_midi_trigger(&bebob->rx_stream,
76 substrm->number, NULL);
77
78 spin_unlock_irqrestore(&bebob->lock, flags);
79 }
80
81 static void set_midi_substream_names(struct snd_bebob *bebob,
82 struct snd_rawmidi_str *str)
83 {
84 struct snd_rawmidi_substream *subs;
85
86 list_for_each_entry(subs, &str->substreams, list) {
87 scnprintf(subs->name, sizeof(subs->name),
88 "%s MIDI %d",
89 bebob->card->shortname, subs->number + 1);
90 }
91 }
92
93 int snd_bebob_create_midi_devices(struct snd_bebob *bebob)
94 {
95 static const struct snd_rawmidi_ops capture_ops = {
96 .open = midi_open,
97 .close = midi_close,
98 .trigger = midi_capture_trigger,
99 };
100 static const struct snd_rawmidi_ops playback_ops = {
101 .open = midi_open,
102 .close = midi_close,
103 .trigger = midi_playback_trigger,
104 };
105 struct snd_rawmidi *rmidi;
106 struct snd_rawmidi_str *str;
107 int err;
108
109 /* create midi ports */
110 err = snd_rawmidi_new(bebob->card, bebob->card->driver, 0,
111 bebob->midi_output_ports, bebob->midi_input_ports,
112 &rmidi);
113 if (err < 0)
114 return err;
115
116 snprintf(rmidi->name, sizeof(rmidi->name),
117 "%s MIDI", bebob->card->shortname);
118 rmidi->private_data = bebob;
119
120 if (bebob->midi_input_ports > 0) {
121 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
122
123 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
124 &capture_ops);
125
126 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
127
128 set_midi_substream_names(bebob, str);
129 }
130
131 if (bebob->midi_output_ports > 0) {
132 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
133
134 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
135 &playback_ops);
136
137 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
138
139 set_midi_substream_names(bebob, str);
140 }
141
142 if ((bebob->midi_output_ports > 0) && (bebob->midi_input_ports > 0))
143 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
144
145 return 0;
146 }
147
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