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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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
10static int midi_capture_open(struct snd_rawmidi_substream *substream)
11{
12 /* Do nothing. */
13 return 0;
14}
15
16static 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
29static int midi_capture_close(struct snd_rawmidi_substream *substream)
30{
31 /* Do nothing. */
32 return 0;
33}
34
35static 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
45static void midi_capture_trigger(struct snd_rawmidi_substream *substream,
46 int up)
47{
48 struct snd_ff *ff = substream->rmidi->private_data;
49
50 guard(spinlock_irqsave)(&ff->lock);
51
52 if (up)
53 WRITE_ONCE(ff->tx_midi_substreams[substream->number],
54 substream);
55 else
56 WRITE_ONCE(ff->tx_midi_substreams[substream->number], NULL);
57}
58
59static void midi_playback_trigger(struct snd_rawmidi_substream *substream,
60 int up)
61{
62 struct snd_ff *ff = substream->rmidi->private_data;
63
64 guard(spinlock_irqsave)(&ff->lock);
65
66 if (up || !ff->rx_midi_error[substream->number])
67 schedule_work(&ff->rx_midi_work[substream->number]);
68}
69
70static void set_midi_substream_names(struct snd_rawmidi_str *stream,
71 const char *const name)
72{
73 struct snd_rawmidi_substream *substream;
74
75 list_for_each_entry(substream, &stream->substreams, list) {
76 scnprintf(substream->name, sizeof(substream->name),
77 "%s MIDI %d", name, substream->number + 1);
78 }
79}
80
81int snd_ff_create_midi_devices(struct snd_ff *ff)
82{
83 static const struct snd_rawmidi_ops midi_capture_ops = {
84 .open = midi_capture_open,
85 .close = midi_capture_close,
86 .trigger = midi_capture_trigger,
87 };
88 static const struct snd_rawmidi_ops midi_playback_ops = {
89 .open = midi_playback_open,
90 .close = midi_playback_close,
91 .trigger = midi_playback_trigger,
92 };
93 struct snd_rawmidi *rmidi;
94 struct snd_rawmidi_str *stream;
95 int err;
96
97 err = snd_rawmidi_new(ff->card, ff->card->driver, 0,
98 ff->spec->midi_out_ports, ff->spec->midi_in_ports,
99 &rmidi);
100 if (err < 0)
101 return err;
102
103 snprintf(rmidi->name, sizeof(rmidi->name),
104 "%s MIDI", ff->card->shortname);
105 rmidi->private_data = ff;
106
107 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
108 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
109 &midi_capture_ops);
110 stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
111 set_midi_substream_names(stream, ff->card->shortname);
112
113 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
114 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
115 &midi_playback_ops);
116 stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
117 set_midi_substream_names(stream, ff->card->shortname);
118
119 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
120
121 return 0;
122}