1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * ff-midi.c - a part of driver for RME Fireface series
4  *
5  * Copyright (c) 2015-2017 Takashi Sakamoto
6  */
7 
8 #include "ff.h"
9 
10 static int midi_capture_open(struct snd_rawmidi_substream *substream)
11 {
12 	/* Do nothing. */
13 	return 0;
14 }
15 
16 static int midi_playback_open(struct snd_rawmidi_substream *substream)
17 {
18 	struct snd_ff *ff = substream->rmidi->private_data;
19 
20 	/* Initialize internal status. */
21 	ff->on_sysex[substream->number] = 0;
22 	ff->rx_midi_error[substream->number] = false;
23 
24 	WRITE_ONCE(ff->rx_midi_substreams[substream->number], substream);
25 
26 	return 0;
27 }
28 
29 static int midi_capture_close(struct snd_rawmidi_substream *substream)
30 {
31 	/* Do nothing. */
32 	return 0;
33 }
34 
35 static int midi_playback_close(struct snd_rawmidi_substream *substream)
36 {
37 	struct snd_ff *ff = substream->rmidi->private_data;
38 
39 	cancel_work_sync(&ff->rx_midi_work[substream->number]);
40 	WRITE_ONCE(ff->rx_midi_substreams[substream->number], NULL);
41 
42 	return 0;
43 }
44 
45 static void midi_capture_trigger(struct snd_rawmidi_substream *substream,
46 				 int up)
47 {
48 	struct snd_ff *ff = substream->rmidi->private_data;
49 	unsigned long flags;
50 
51 	spin_lock_irqsave(&ff->lock, flags);
52 
53 	if (up)
54 		WRITE_ONCE(ff->tx_midi_substreams[substream->number],
55 			   substream);
56 	else
57 		WRITE_ONCE(ff->tx_midi_substreams[substream->number], NULL);
58 
59 	spin_unlock_irqrestore(&ff->lock, flags);
60 }
61 
62 static void midi_playback_trigger(struct snd_rawmidi_substream *substream,
63 				  int up)
64 {
65 	struct snd_ff *ff = substream->rmidi->private_data;
66 	unsigned long flags;
67 
68 	spin_lock_irqsave(&ff->lock, flags);
69 
70 	if (up || !ff->rx_midi_error[substream->number])
71 		schedule_work(&ff->rx_midi_work[substream->number]);
72 
73 	spin_unlock_irqrestore(&ff->lock, flags);
74 }
75 
76 static void set_midi_substream_names(struct snd_rawmidi_str *stream,
77 				     const char *const name)
78 {
79 	struct snd_rawmidi_substream *substream;
80 
81 	list_for_each_entry(substream, &stream->substreams, list) {
82 		scnprintf(substream->name, sizeof(substream->name),
83 			  "%s MIDI %d", name, substream->number + 1);
84 	}
85 }
86 
87 int snd_ff_create_midi_devices(struct snd_ff *ff)
88 {
89 	static const struct snd_rawmidi_ops midi_capture_ops = {
90 		.open		= midi_capture_open,
91 		.close		= midi_capture_close,
92 		.trigger	= midi_capture_trigger,
93 	};
94 	static const struct snd_rawmidi_ops midi_playback_ops = {
95 		.open		= midi_playback_open,
96 		.close		= midi_playback_close,
97 		.trigger	= midi_playback_trigger,
98 	};
99 	struct snd_rawmidi *rmidi;
100 	struct snd_rawmidi_str *stream;
101 	int err;
102 
103 	err = snd_rawmidi_new(ff->card, ff->card->driver, 0,
104 			      ff->spec->midi_out_ports, ff->spec->midi_in_ports,
105 			      &rmidi);
106 	if (err < 0)
107 		return err;
108 
109 	snprintf(rmidi->name, sizeof(rmidi->name),
110 		 "%s MIDI", ff->card->shortname);
111 	rmidi->private_data = ff;
112 
113 	rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
114 	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
115 			    &midi_capture_ops);
116 	stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
117 	set_midi_substream_names(stream, ff->card->shortname);
118 
119 	rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
120 	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
121 			    &midi_playback_ops);
122 	stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
123 	set_midi_substream_names(stream, ff->card->shortname);
124 
125 	rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
126 
127 	return 0;
128 }
129