tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * bebob_midi.c - a part of driver for BeBoB based devices
3 *
4 * Copyright (c) 2013-2014 Takashi Sakamoto
5 *
6 * Licensed under the terms of the GNU General Public License, version 2.
7 */
8
9#include "bebob.h"
10
11static int midi_capture_open(struct snd_rawmidi_substream *substream)
12{
13 struct snd_bebob *bebob = substream->rmidi->private_data;
14 int err;
15
16 err = snd_bebob_stream_lock_try(bebob);
17 if (err < 0)
18 goto end;
19
20 mutex_lock(&bebob->mutex);
21 bebob->substreams_counter++;
22 err = snd_bebob_stream_start_duplex(bebob, 0);
23 mutex_unlock(&bebob->mutex);
24 if (err < 0)
25 snd_bebob_stream_lock_release(bebob);
26end:
27 return err;
28}
29
30static int midi_playback_open(struct snd_rawmidi_substream *substream)
31{
32 struct snd_bebob *bebob = substream->rmidi->private_data;
33 int err;
34
35 err = snd_bebob_stream_lock_try(bebob);
36 if (err < 0)
37 goto end;
38
39 mutex_lock(&bebob->mutex);
40 bebob->substreams_counter++;
41 err = snd_bebob_stream_start_duplex(bebob, 0);
42 mutex_unlock(&bebob->mutex);
43 if (err < 0)
44 snd_bebob_stream_lock_release(bebob);
45end:
46 return err;
47}
48
49static int midi_capture_close(struct snd_rawmidi_substream *substream)
50{
51 struct snd_bebob *bebob = substream->rmidi->private_data;
52
53 mutex_lock(&bebob->mutex);
54 bebob->substreams_counter--;
55 snd_bebob_stream_stop_duplex(bebob);
56 mutex_unlock(&bebob->mutex);
57
58 snd_bebob_stream_lock_release(bebob);
59 return 0;
60}
61
62static int midi_playback_close(struct snd_rawmidi_substream *substream)
63{
64 struct snd_bebob *bebob = substream->rmidi->private_data;
65
66 mutex_lock(&bebob->mutex);
67 bebob->substreams_counter--;
68 snd_bebob_stream_stop_duplex(bebob);
69 mutex_unlock(&bebob->mutex);
70
71 snd_bebob_stream_lock_release(bebob);
72 return 0;
73}
74
75static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
76{
77 struct snd_bebob *bebob = substrm->rmidi->private_data;
78 unsigned long flags;
79
80 spin_lock_irqsave(&bebob->lock, flags);
81
82 if (up)
83 amdtp_am824_midi_trigger(&bebob->tx_stream,
84 substrm->number, substrm);
85 else
86 amdtp_am824_midi_trigger(&bebob->tx_stream,
87 substrm->number, NULL);
88
89 spin_unlock_irqrestore(&bebob->lock, flags);
90}
91
92static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
93{
94 struct snd_bebob *bebob = substrm->rmidi->private_data;
95 unsigned long flags;
96
97 spin_lock_irqsave(&bebob->lock, flags);
98
99 if (up)
100 amdtp_am824_midi_trigger(&bebob->rx_stream,
101 substrm->number, substrm);
102 else
103 amdtp_am824_midi_trigger(&bebob->rx_stream,
104 substrm->number, NULL);
105
106 spin_unlock_irqrestore(&bebob->lock, flags);
107}
108
109static void set_midi_substream_names(struct snd_bebob *bebob,
110 struct snd_rawmidi_str *str)
111{
112 struct snd_rawmidi_substream *subs;
113
114 list_for_each_entry(subs, &str->substreams, list) {
115 snprintf(subs->name, sizeof(subs->name),
116 "%s MIDI %d",
117 bebob->card->shortname, subs->number + 1);
118 }
119}
120
121int snd_bebob_create_midi_devices(struct snd_bebob *bebob)
122{
123 static const struct snd_rawmidi_ops capture_ops = {
124 .open = midi_capture_open,
125 .close = midi_capture_close,
126 .trigger = midi_capture_trigger,
127 };
128 static const struct snd_rawmidi_ops playback_ops = {
129 .open = midi_playback_open,
130 .close = midi_playback_close,
131 .trigger = midi_playback_trigger,
132 };
133 struct snd_rawmidi *rmidi;
134 struct snd_rawmidi_str *str;
135 int err;
136
137 /* create midi ports */
138 err = snd_rawmidi_new(bebob->card, bebob->card->driver, 0,
139 bebob->midi_output_ports, bebob->midi_input_ports,
140 &rmidi);
141 if (err < 0)
142 return err;
143
144 snprintf(rmidi->name, sizeof(rmidi->name),
145 "%s MIDI", bebob->card->shortname);
146 rmidi->private_data = bebob;
147
148 if (bebob->midi_input_ports > 0) {
149 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
150
151 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
152 &capture_ops);
153
154 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
155
156 set_midi_substream_names(bebob, str);
157 }
158
159 if (bebob->midi_output_ports > 0) {
160 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
161
162 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
163 &playback_ops);
164
165 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
166
167 set_midi_substream_names(bebob, str);
168 }
169
170 if ((bebob->midi_output_ports > 0) && (bebob->midi_input_ports > 0))
171 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
172
173 return 0;
174}