1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * dice_midi.c - a part of driver for Dice based devices
4 *
5 * Copyright (c) 2014 Takashi Sakamoto
6 */
7 #include "dice.h"
8
9 static int midi_open(struct snd_rawmidi_substream *substream)
10 {
11 struct snd_dice *dice = substream->rmidi->private_data;
12 int err;
13
14 err = snd_dice_stream_lock_try(dice);
15 if (err < 0)
16 return err;
17
18 mutex_lock(&dice->mutex);
19
20 err = snd_dice_stream_reserve_duplex(dice, 0, 0, 0);
21 if (err >= 0) {
22 ++dice->substreams_counter;
23 err = snd_dice_stream_start_duplex(dice);
24 if (err < 0)
25 --dice->substreams_counter;
26 }
27
28 mutex_unlock(&dice->mutex);
29
30 if (err < 0)
31 snd_dice_stream_lock_release(dice);
32
33 return err;
34 }
35
36 static int midi_close(struct snd_rawmidi_substream *substream)
37 {
38 struct snd_dice *dice = substream->rmidi->private_data;
39
40 mutex_lock(&dice->mutex);
41
42 --dice->substreams_counter;
43 snd_dice_stream_stop_duplex(dice);
44
45 mutex_unlock(&dice->mutex);
46
47 snd_dice_stream_lock_release(dice);
48 return 0;
49 }
50
51 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
52 {
53 struct snd_dice *dice = substrm->rmidi->private_data;
54 unsigned long flags;
55
56 spin_lock_irqsave(&dice->lock, flags);
57
58 if (up)
59 amdtp_am824_midi_trigger(&dice->tx_stream[0],
60 substrm->number, substrm);
61 else
62 amdtp_am824_midi_trigger(&dice->tx_stream[0],
63 substrm->number, NULL);
64
65 spin_unlock_irqrestore(&dice->lock, flags);
66 }
67
68 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
69 {
70 struct snd_dice *dice = substrm->rmidi->private_data;
71 unsigned long flags;
72
73 spin_lock_irqsave(&dice->lock, flags);
74
75 if (up)
76 amdtp_am824_midi_trigger(&dice->rx_stream[0],
77 substrm->number, substrm);
78 else
79 amdtp_am824_midi_trigger(&dice->rx_stream[0],
80 substrm->number, NULL);
81
82 spin_unlock_irqrestore(&dice->lock, flags);
83 }
84
85 static void set_midi_substream_names(struct snd_dice *dice,
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(subs->name, sizeof(subs->name),
92 "%s MIDI %d", dice->card->shortname, subs->number + 1);
93 }
94 }
95
96 int snd_dice_create_midi(struct snd_dice *dice)
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 unsigned int midi_in_ports, midi_out_ports;
111 int i;
112 int err;
113
114 midi_in_ports = 0;
115 midi_out_ports = 0;
116 for (i = 0; i < MAX_STREAMS; ++i) {
117 midi_in_ports = max(midi_in_ports, dice->tx_midi_ports[i]);
118 midi_out_ports = max(midi_out_ports, dice->rx_midi_ports[i]);
119 }
120
121 if (midi_in_ports + midi_out_ports == 0)
122 return 0;
123
124 /* create midi ports */
125 err = snd_rawmidi_new(dice->card, dice->card->driver, 0,
126 midi_out_ports, midi_in_ports,
127 &rmidi);
128 if (err < 0)
129 return err;
130
131 snprintf(rmidi->name, sizeof(rmidi->name),
132 "%s MIDI", dice->card->shortname);
133 rmidi->private_data = dice;
134
135 if (midi_in_ports > 0) {
136 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
137
138 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
139 &capture_ops);
140
141 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
142
143 set_midi_substream_names(dice, str);
144 }
145
146 if (midi_out_ports > 0) {
147 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
148
149 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
150 &playback_ops);
151
152 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
153
154 set_midi_substream_names(dice, str);
155 }
156
157 if ((midi_out_ports > 0) && (midi_in_ports > 0))
158 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
159
160 return 0;
161 }
162
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