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
9static 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
36static 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
51static 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
68static 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
85static 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
96int 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