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1 | /* |
2 | * Dummy soundcard for virtual rawmidi devices |
3 | * |
4 | * Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de> |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | * |
20 | */ |
21 | |
22 | /* |
23 | * VIRTUAL RAW MIDI DEVICE CARDS |
24 | * |
25 | * This dummy card contains up to 4 virtual rawmidi devices. |
26 | * They are not real rawmidi devices but just associated with sequencer |
27 | * clients, so that any input/output sources can be connected as a raw |
28 | * MIDI device arbitrary. |
29 | * Also, multiple access is allowed to a single rawmidi device. |
30 | * |
31 | * Typical usage is like following: |
32 | * - Load snd-virmidi module. |
33 | * # modprobe snd-virmidi index=2 |
34 | * Then, sequencer clients 72:0 to 75:0 will be created, which are |
35 | * mapped from /dev/snd/midiC1D0 to /dev/snd/midiC1D3, respectively. |
36 | * |
37 | * - Connect input/output via aconnect. |
38 | * % aconnect 64:0 72:0 # keyboard input redirection 64:0 -> 72:0 |
39 | * % aconnect 72:0 65:0 # output device redirection 72:0 -> 65:0 |
40 | * |
41 | * - Run application using a midi device (eg. /dev/snd/midiC1D0) |
42 | */ |
43 | |
44 | #include <linux/init.h> |
45 | #include <linux/wait.h> |
46 | #include <linux/err.h> |
47 | #include <linux/platform_device.h> |
48 | #include <linux/moduleparam.h> |
49 | #include <sound/core.h> |
50 | #include <sound/seq_kernel.h> |
51 | #include <sound/seq_virmidi.h> |
52 | #include <sound/initval.h> |
53 | |
54 | /* hack: OSS defines midi_devs, so undefine it (versioned symbols) */ |
55 | #undef midi_devs |
56 | |
57 | MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); |
58 | MODULE_DESCRIPTION("Dummy soundcard for virtual rawmidi devices"); |
59 | MODULE_LICENSE("GPL"); |
60 | MODULE_SUPPORTED_DEVICE("{{ALSA,Virtual rawmidi device}}"); |
61 | |
62 | #define MAX_MIDI_DEVICES 4 |
63 | |
64 | static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ |
65 | static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ |
66 | static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; |
67 | static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 4}; |
68 | |
69 | module_param_array(index, int, NULL, 0444); |
70 | MODULE_PARM_DESC(index, "Index value for virmidi soundcard."); |
71 | module_param_array(id, charp, NULL, 0444); |
72 | MODULE_PARM_DESC(id, "ID string for virmidi soundcard."); |
73 | module_param_array(enable, bool, NULL, 0444); |
74 | MODULE_PARM_DESC(enable, "Enable this soundcard."); |
75 | module_param_array(midi_devs, int, NULL, 0444); |
76 | MODULE_PARM_DESC(midi_devs, "MIDI devices # (1-4)"); |
77 | |
78 | struct snd_card_virmidi { |
79 | struct snd_card *card; |
80 | struct snd_rawmidi *midi[MAX_MIDI_DEVICES]; |
81 | }; |
82 | |
83 | static struct platform_device *devices[SNDRV_CARDS]; |
84 | |
85 | |
86 | static int __devinit snd_virmidi_probe(struct platform_device *devptr) |
87 | { |
88 | struct snd_card *card; |
89 | struct snd_card_virmidi *vmidi; |
90 | int idx, err; |
91 | int dev = devptr->id; |
92 | |
93 | err = snd_card_create(index[dev], id[dev], THIS_MODULE, |
94 | sizeof(struct snd_card_virmidi), &card); |
95 | if (err < 0) |
96 | return err; |
97 | vmidi = card->private_data; |
98 | vmidi->card = card; |
99 | |
100 | if (midi_devs[dev] > MAX_MIDI_DEVICES) { |
101 | snd_printk(KERN_WARNING |
102 | "too much midi devices for virmidi %d: " |
103 | "force to use %d\n", dev, MAX_MIDI_DEVICES); |
104 | midi_devs[dev] = MAX_MIDI_DEVICES; |
105 | } |
106 | for (idx = 0; idx < midi_devs[dev]; idx++) { |
107 | struct snd_rawmidi *rmidi; |
108 | struct snd_virmidi_dev *rdev; |
109 | if ((err = snd_virmidi_new(card, idx, &rmidi)) < 0) |
110 | goto __nodev; |
111 | rdev = rmidi->private_data; |
112 | vmidi->midi[idx] = rmidi; |
113 | strcpy(rmidi->name, "Virtual Raw MIDI"); |
114 | rdev->seq_mode = SNDRV_VIRMIDI_SEQ_DISPATCH; |
115 | } |
116 | |
117 | strcpy(card->driver, "VirMIDI"); |
118 | strcpy(card->shortname, "VirMIDI"); |
119 | sprintf(card->longname, "Virtual MIDI Card %i", dev + 1); |
120 | |
121 | snd_card_set_dev(card, &devptr->dev); |
122 | |
123 | if ((err = snd_card_register(card)) == 0) { |
124 | platform_set_drvdata(devptr, card); |
125 | return 0; |
126 | } |
127 | __nodev: |
128 | snd_card_free(card); |
129 | return err; |
130 | } |
131 | |
132 | static int __devexit snd_virmidi_remove(struct platform_device *devptr) |
133 | { |
134 | snd_card_free(platform_get_drvdata(devptr)); |
135 | platform_set_drvdata(devptr, NULL); |
136 | return 0; |
137 | } |
138 | |
139 | #define SND_VIRMIDI_DRIVER "snd_virmidi" |
140 | |
141 | static struct platform_driver snd_virmidi_driver = { |
142 | .probe = snd_virmidi_probe, |
143 | .remove = __devexit_p(snd_virmidi_remove), |
144 | .driver = { |
145 | .name = SND_VIRMIDI_DRIVER |
146 | }, |
147 | }; |
148 | |
149 | static void snd_virmidi_unregister_all(void) |
150 | { |
151 | int i; |
152 | |
153 | for (i = 0; i < ARRAY_SIZE(devices); ++i) |
154 | platform_device_unregister(devices[i]); |
155 | platform_driver_unregister(&snd_virmidi_driver); |
156 | } |
157 | |
158 | static int __init alsa_card_virmidi_init(void) |
159 | { |
160 | int i, cards, err; |
161 | |
162 | if ((err = platform_driver_register(&snd_virmidi_driver)) < 0) |
163 | return err; |
164 | |
165 | cards = 0; |
166 | for (i = 0; i < SNDRV_CARDS; i++) { |
167 | struct platform_device *device; |
168 | if (! enable[i]) |
169 | continue; |
170 | device = platform_device_register_simple(SND_VIRMIDI_DRIVER, |
171 | i, NULL, 0); |
172 | if (IS_ERR(device)) |
173 | continue; |
174 | if (!platform_get_drvdata(device)) { |
175 | platform_device_unregister(device); |
176 | continue; |
177 | } |
178 | devices[i] = device; |
179 | cards++; |
180 | } |
181 | if (!cards) { |
182 | #ifdef MODULE |
183 | printk(KERN_ERR "Card-VirMIDI soundcard not found or device busy\n"); |
184 | #endif |
185 | snd_virmidi_unregister_all(); |
186 | return -ENODEV; |
187 | } |
188 | return 0; |
189 | } |
190 | |
191 | static void __exit alsa_card_virmidi_exit(void) |
192 | { |
193 | snd_virmidi_unregister_all(); |
194 | } |
195 | |
196 | module_init(alsa_card_virmidi_init) |
197 | module_exit(alsa_card_virmidi_exit) |
198 |
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