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1da177e4 LT |
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 <sound/driver.h> | |
45 | #include <linux/init.h> | |
46 | #include <linux/wait.h> | |
3564fbb8 TI |
47 | #include <linux/err.h> |
48 | #include <linux/platform_device.h> | |
1da177e4 LT |
49 | #include <linux/moduleparam.h> |
50 | #include <sound/core.h> | |
51 | #include <sound/seq_kernel.h> | |
52 | #include <sound/seq_virmidi.h> | |
53 | #include <sound/initval.h> | |
54 | ||
55 | /* hack: OSS defines midi_devs, so undefine it (versioned symbols) */ | |
56 | #undef midi_devs | |
57 | ||
58 | MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); | |
59 | MODULE_DESCRIPTION("Dummy soundcard for virtual rawmidi devices"); | |
60 | MODULE_LICENSE("GPL"); | |
61 | MODULE_SUPPORTED_DEVICE("{{ALSA,Virtual rawmidi device}}"); | |
62 | ||
204bdb1b | 63 | #define MAX_MIDI_DEVICES 4 |
1da177e4 LT |
64 | |
65 | static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ | |
66 | static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ | |
c5533bf3 | 67 | static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; |
1da177e4 LT |
68 | static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 4}; |
69 | ||
70 | module_param_array(index, int, NULL, 0444); | |
71 | MODULE_PARM_DESC(index, "Index value for virmidi soundcard."); | |
72 | module_param_array(id, charp, NULL, 0444); | |
73 | MODULE_PARM_DESC(id, "ID string for virmidi soundcard."); | |
74 | module_param_array(enable, bool, NULL, 0444); | |
75 | MODULE_PARM_DESC(enable, "Enable this soundcard."); | |
76 | module_param_array(midi_devs, int, NULL, 0444); | |
204bdb1b | 77 | MODULE_PARM_DESC(midi_devs, "MIDI devices # (1-4)"); |
1da177e4 | 78 | |
4a4d2cfd TI |
79 | struct snd_card_virmidi { |
80 | struct snd_card *card; | |
81 | struct snd_rawmidi *midi[MAX_MIDI_DEVICES]; | |
82 | }; | |
1da177e4 | 83 | |
f7a9275d CL |
84 | static struct platform_device *devices[SNDRV_CARDS]; |
85 | ||
1da177e4 | 86 | |
788c6043 | 87 | static int __devinit snd_virmidi_probe(struct platform_device *devptr) |
1da177e4 | 88 | { |
4a4d2cfd | 89 | struct snd_card *card; |
1da177e4 LT |
90 | struct snd_card_virmidi *vmidi; |
91 | int idx, err; | |
3564fbb8 | 92 | int dev = devptr->id; |
1da177e4 | 93 | |
1da177e4 LT |
94 | card = snd_card_new(index[dev], id[dev], THIS_MODULE, |
95 | sizeof(struct snd_card_virmidi)); | |
96 | if (card == NULL) | |
97 | return -ENOMEM; | |
98 | vmidi = (struct snd_card_virmidi *)card->private_data; | |
99 | vmidi->card = card; | |
100 | ||
101 | if (midi_devs[dev] > MAX_MIDI_DEVICES) { | |
102 | snd_printk("too much midi devices for virmidi %d: force to use %d\n", dev, MAX_MIDI_DEVICES); | |
103 | midi_devs[dev] = MAX_MIDI_DEVICES; | |
104 | } | |
105 | for (idx = 0; idx < midi_devs[dev]; idx++) { | |
4a4d2cfd TI |
106 | struct snd_rawmidi *rmidi; |
107 | struct snd_virmidi_dev *rdev; | |
1da177e4 LT |
108 | if ((err = snd_virmidi_new(card, idx, &rmidi)) < 0) |
109 | goto __nodev; | |
110 | rdev = rmidi->private_data; | |
111 | vmidi->midi[idx] = rmidi; | |
112 | strcpy(rmidi->name, "Virtual Raw MIDI"); | |
113 | rdev->seq_mode = SNDRV_VIRMIDI_SEQ_DISPATCH; | |
114 | } | |
115 | ||
116 | strcpy(card->driver, "VirMIDI"); | |
117 | strcpy(card->shortname, "VirMIDI"); | |
118 | sprintf(card->longname, "Virtual MIDI Card %i", dev + 1); | |
16dab54b | 119 | |
3564fbb8 | 120 | snd_card_set_dev(card, &devptr->dev); |
16dab54b | 121 | |
1da177e4 | 122 | if ((err = snd_card_register(card)) == 0) { |
3564fbb8 | 123 | platform_set_drvdata(devptr, card); |
1da177e4 LT |
124 | return 0; |
125 | } | |
126 | __nodev: | |
127 | snd_card_free(card); | |
128 | return err; | |
129 | } | |
130 | ||
788c6043 | 131 | static int __devexit snd_virmidi_remove(struct platform_device *devptr) |
1da177e4 | 132 | { |
3564fbb8 TI |
133 | snd_card_free(platform_get_drvdata(devptr)); |
134 | platform_set_drvdata(devptr, NULL); | |
135 | return 0; | |
136 | } | |
1da177e4 | 137 | |
3564fbb8 TI |
138 | #define SND_VIRMIDI_DRIVER "snd_virmidi" |
139 | ||
140 | static struct platform_driver snd_virmidi_driver = { | |
141 | .probe = snd_virmidi_probe, | |
788c6043 | 142 | .remove = __devexit_p(snd_virmidi_remove), |
3564fbb8 TI |
143 | .driver = { |
144 | .name = SND_VIRMIDI_DRIVER | |
145 | }, | |
146 | }; | |
147 | ||
bdec0c72 | 148 | static void snd_virmidi_unregister_all(void) |
f7a9275d CL |
149 | { |
150 | int i; | |
151 | ||
152 | for (i = 0; i < ARRAY_SIZE(devices); ++i) | |
153 | platform_device_unregister(devices[i]); | |
154 | platform_driver_unregister(&snd_virmidi_driver); | |
155 | } | |
156 | ||
3564fbb8 TI |
157 | static int __init alsa_card_virmidi_init(void) |
158 | { | |
159 | int i, cards, err; | |
160 | ||
161 | if ((err = platform_driver_register(&snd_virmidi_driver)) < 0) | |
162 | return err; | |
163 | ||
164 | cards = 0; | |
8278ca8f | 165 | for (i = 0; i < SNDRV_CARDS; i++) { |
3564fbb8 | 166 | struct platform_device *device; |
8278ca8f TI |
167 | if (! enable[i]) |
168 | continue; | |
3564fbb8 TI |
169 | device = platform_device_register_simple(SND_VIRMIDI_DRIVER, |
170 | i, NULL, 0); | |
a182ee98 RH |
171 | if (IS_ERR(device)) |
172 | continue; | |
7152447d RH |
173 | if (!platform_get_drvdata(device)) { |
174 | platform_device_unregister(device); | |
175 | continue; | |
176 | } | |
f7a9275d | 177 | devices[i] = device; |
1da177e4 LT |
178 | cards++; |
179 | } | |
180 | if (!cards) { | |
181 | #ifdef MODULE | |
182 | printk(KERN_ERR "Card-VirMIDI soundcard not found or device busy\n"); | |
183 | #endif | |
a182ee98 RH |
184 | snd_virmidi_unregister_all(); |
185 | return -ENODEV; | |
1da177e4 LT |
186 | } |
187 | return 0; | |
188 | } | |
189 | ||
190 | static void __exit alsa_card_virmidi_exit(void) | |
191 | { | |
f7a9275d | 192 | snd_virmidi_unregister_all(); |
1da177e4 LT |
193 | } |
194 | ||
195 | module_init(alsa_card_virmidi_init) | |
196 | module_exit(alsa_card_virmidi_exit) |