dice-midi.c

  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	scoped_guard(mutex, &dice->mutex) {
 19		err = snd_dice_stream_reserve_duplex(dice, 0, 0, 0);
 20		if (err >= 0) {
 21			++dice->substreams_counter;
 22			err = snd_dice_stream_start_duplex(dice);
 23			if (err < 0)
 24				--dice->substreams_counter;
 25		}
 26	}
 27
 28	if (err < 0)
 29		snd_dice_stream_lock_release(dice);
 30
 31	return err;
 32}
 33
 34static int midi_close(struct snd_rawmidi_substream *substream)
 35{
 36	struct snd_dice *dice = substream->rmidi->private_data;
 37
 38	scoped_guard(mutex, &dice->mutex) {
 39		--dice->substreams_counter;
 40		snd_dice_stream_stop_duplex(dice);
 41	}
 42
 43	snd_dice_stream_lock_release(dice);
 44	return 0;
 45}
 46
 47static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
 48{
 49	struct snd_dice *dice = substrm->rmidi->private_data;
 50
 51	guard(spinlock_irqsave)(&dice->lock);
 52
 53	if (up)
 54		amdtp_am824_midi_trigger(&dice->tx_stream[0],
 55					  substrm->number, substrm);
 56	else
 57		amdtp_am824_midi_trigger(&dice->tx_stream[0],
 58					  substrm->number, NULL);
 59}
 60
 61static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
 62{
 63	struct snd_dice *dice = substrm->rmidi->private_data;
 64
 65	guard(spinlock_irqsave)(&dice->lock);
 66
 67	if (up)
 68		amdtp_am824_midi_trigger(&dice->rx_stream[0],
 69					 substrm->number, substrm);
 70	else
 71		amdtp_am824_midi_trigger(&dice->rx_stream[0],
 72					 substrm->number, NULL);
 73}
 74
 75static void set_midi_substream_names(struct snd_dice *dice,
 76				     struct snd_rawmidi_str *str)
 77{
 78	struct snd_rawmidi_substream *subs;
 79
 80	list_for_each_entry(subs, &str->substreams, list) {
 81		scnprintf(subs->name, sizeof(subs->name),
 82			  "%s MIDI %d", dice->card->shortname, subs->number + 1);
 83	}
 84}
 85
 86int snd_dice_create_midi(struct snd_dice *dice)
 87{
 88	static const struct snd_rawmidi_ops capture_ops = {
 89		.open		= midi_open,
 90		.close		= midi_close,
 91		.trigger	= midi_capture_trigger,
 92	};
 93	static const struct snd_rawmidi_ops playback_ops = {
 94		.open		= midi_open,
 95		.close		= midi_close,
 96		.trigger	= midi_playback_trigger,
 97	};
 98	struct snd_rawmidi *rmidi;
 99	struct snd_rawmidi_str *str;
100	unsigned int midi_in_ports, midi_out_ports;
101	int i;
102	int err;
103
104	midi_in_ports = 0;
105	midi_out_ports = 0;
106	for (i = 0; i < MAX_STREAMS; ++i) {
107		midi_in_ports = max(midi_in_ports, dice->tx_midi_ports[i]);
108		midi_out_ports = max(midi_out_ports, dice->rx_midi_ports[i]);
109	}
110
111	if (midi_in_ports + midi_out_ports == 0)
112		return 0;
113
114	/* create midi ports */
115	err = snd_rawmidi_new(dice->card, dice->card->driver, 0,
116			      midi_out_ports, midi_in_ports,
117			      &rmidi);
118	if (err < 0)
119		return err;
120
121	snprintf(rmidi->name, sizeof(rmidi->name),
122		 "%s MIDI", dice->card->shortname);
123	rmidi->private_data = dice;
124
125	if (midi_in_ports > 0) {
126		rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
127
128		snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
129				    &capture_ops);
130
131		str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
132
133		set_midi_substream_names(dice, str);
134	}
135
136	if (midi_out_ports > 0) {
137		rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
138
139		snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
140				    &playback_ops);
141
142		str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
143
144		set_midi_substream_names(dice, str);
145	}
146
147	if ((midi_out_ports > 0) && (midi_in_ports > 0))
148		rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
149
150	return 0;
151}