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 
11 static 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);
26 end:
27 	return err;
28 }
29 
30 static 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);
45 end:
46 	return err;
47 }
48 
49 static 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 
62 static 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 
75 static 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 
92 static 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 
109 static struct snd_rawmidi_ops midi_capture_ops = {
110 	.open		= midi_capture_open,
111 	.close		= midi_capture_close,
112 	.trigger	= midi_capture_trigger,
113 };
114 
115 static struct snd_rawmidi_ops midi_playback_ops = {
116 	.open		= midi_playback_open,
117 	.close		= midi_playback_close,
118 	.trigger	= midi_playback_trigger,
119 };
120 
121 static void set_midi_substream_names(struct snd_bebob *bebob,
122 				     struct snd_rawmidi_str *str)
123 {
124 	struct snd_rawmidi_substream *subs;
125 
126 	list_for_each_entry(subs, &str->substreams, list) {
127 		snprintf(subs->name, sizeof(subs->name),
128 			 "%s MIDI %d",
129 			 bebob->card->shortname, subs->number + 1);
130 	}
131 }
132 
133 int snd_bebob_create_midi_devices(struct snd_bebob *bebob)
134 {
135 	struct snd_rawmidi *rmidi;
136 	struct snd_rawmidi_str *str;
137 	int err;
138 
139 	/* create midi ports */
140 	err = snd_rawmidi_new(bebob->card, bebob->card->driver, 0,
141 			      bebob->midi_output_ports, bebob->midi_input_ports,
142 			      &rmidi);
143 	if (err < 0)
144 		return err;
145 
146 	snprintf(rmidi->name, sizeof(rmidi->name),
147 		 "%s MIDI", bebob->card->shortname);
148 	rmidi->private_data = bebob;
149 
150 	if (bebob->midi_input_ports > 0) {
151 		rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
152 
153 		snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
154 				    &midi_capture_ops);
155 
156 		str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
157 
158 		set_midi_substream_names(bebob, str);
159 	}
160 
161 	if (bebob->midi_output_ports > 0) {
162 		rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
163 
164 		snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
165 				    &midi_playback_ops);
166 
167 		str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
168 
169 		set_midi_substream_names(bebob, str);
170 	}
171 
172 	if ((bebob->midi_output_ports > 0) && (bebob->midi_input_ports > 0))
173 		rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
174 
175 	return 0;
176 }
177