1 /*
2 * dice_midi.c - a part of driver for Dice based devices
3 *
4 * Copyright (c) 2014 Takashi Sakamoto
5 *
6 * Licensed under the terms of the GNU General Public License, version 2.
7 */
8 #include "dice.h"
9
midi_open(struct snd_rawmidi_substream * substream)10 static int midi_open(struct snd_rawmidi_substream *substream)
11 {
12 struct snd_dice *dice = substream->rmidi->private_data;
13 int err;
14
15 err = snd_dice_stream_lock_try(dice);
16 if (err < 0)
17 return err;
18
19 mutex_lock(&dice->mutex);
20
21 dice->substreams_counter++;
22 err = snd_dice_stream_start_duplex(dice, 0);
23
24 mutex_unlock(&dice->mutex);
25
26 if (err < 0)
27 snd_dice_stream_lock_release(dice);
28
29 return err;
30 }
31
midi_close(struct snd_rawmidi_substream * substream)32 static int midi_close(struct snd_rawmidi_substream *substream)
33 {
34 struct snd_dice *dice = substream->rmidi->private_data;
35
36 mutex_lock(&dice->mutex);
37
38 dice->substreams_counter--;
39 snd_dice_stream_stop_duplex(dice);
40
41 mutex_unlock(&dice->mutex);
42
43 snd_dice_stream_lock_release(dice);
44 return 0;
45 }
46
midi_capture_trigger(struct snd_rawmidi_substream * substrm,int up)47 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
48 {
49 struct snd_dice *dice = substrm->rmidi->private_data;
50 unsigned long flags;
51
52 spin_lock_irqsave(&dice->lock, flags);
53
54 if (up)
55 amdtp_am824_midi_trigger(&dice->tx_stream[0],
56 substrm->number, substrm);
57 else
58 amdtp_am824_midi_trigger(&dice->tx_stream[0],
59 substrm->number, NULL);
60
61 spin_unlock_irqrestore(&dice->lock, flags);
62 }
63
midi_playback_trigger(struct snd_rawmidi_substream * substrm,int up)64 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
65 {
66 struct snd_dice *dice = substrm->rmidi->private_data;
67 unsigned long flags;
68
69 spin_lock_irqsave(&dice->lock, flags);
70
71 if (up)
72 amdtp_am824_midi_trigger(&dice->rx_stream[0],
73 substrm->number, substrm);
74 else
75 amdtp_am824_midi_trigger(&dice->rx_stream[0],
76 substrm->number, NULL);
77
78 spin_unlock_irqrestore(&dice->lock, flags);
79 }
80
81 static struct snd_rawmidi_ops capture_ops = {
82 .open = midi_open,
83 .close = midi_close,
84 .trigger = midi_capture_trigger,
85 };
86
87 static struct snd_rawmidi_ops playback_ops = {
88 .open = midi_open,
89 .close = midi_close,
90 .trigger = midi_playback_trigger,
91 };
92
set_midi_substream_names(struct snd_dice * dice,struct snd_rawmidi_str * str)93 static void set_midi_substream_names(struct snd_dice *dice,
94 struct snd_rawmidi_str *str)
95 {
96 struct snd_rawmidi_substream *subs;
97
98 list_for_each_entry(subs, &str->substreams, list) {
99 snprintf(subs->name, sizeof(subs->name),
100 "%s MIDI %d", dice->card->shortname, subs->number + 1);
101 }
102 }
103
snd_dice_create_midi(struct snd_dice * dice)104 int snd_dice_create_midi(struct snd_dice *dice)
105 {
106 __be32 reg;
107 struct snd_rawmidi *rmidi;
108 struct snd_rawmidi_str *str;
109 unsigned int midi_in_ports, midi_out_ports;
110 int err;
111
112 /*
113 * Use the number of MIDI conformant data channel at current sampling
114 * transfer frequency.
115 */
116 err = snd_dice_transaction_read_tx(dice, TX_NUMBER_MIDI,
117 ®, sizeof(reg));
118 if (err < 0)
119 return err;
120 midi_in_ports = be32_to_cpu(reg);
121
122 err = snd_dice_transaction_read_rx(dice, RX_NUMBER_MIDI,
123 ®, sizeof(reg));
124 if (err < 0)
125 return err;
126 midi_out_ports = be32_to_cpu(reg);
127
128 if (midi_in_ports + midi_out_ports == 0)
129 return 0;
130
131 /* create midi ports */
132 err = snd_rawmidi_new(dice->card, dice->card->driver, 0,
133 midi_out_ports, midi_in_ports,
134 &rmidi);
135 if (err < 0)
136 return err;
137
138 snprintf(rmidi->name, sizeof(rmidi->name),
139 "%s MIDI", dice->card->shortname);
140 rmidi->private_data = dice;
141
142 if (midi_in_ports > 0) {
143 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
144
145 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
146 &capture_ops);
147
148 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
149
150 set_midi_substream_names(dice, str);
151 }
152
153 if (midi_out_ports > 0) {
154 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
155
156 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
157 &playback_ops);
158
159 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
160
161 set_midi_substream_names(dice, str);
162 }
163
164 if ((midi_out_ports > 0) && (midi_in_ports > 0))
165 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
166
167 return 0;
168 }
169