Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Dummy soundcard for virtual rawmidi devices | |
4 | * | |
5 | * Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de> | |
1da177e4 LT |
6 | */ |
7 | ||
8 | /* | |
9 | * VIRTUAL RAW MIDI DEVICE CARDS | |
10 | * | |
11 | * This dummy card contains up to 4 virtual rawmidi devices. | |
12 | * They are not real rawmidi devices but just associated with sequencer | |
13 | * clients, so that any input/output sources can be connected as a raw | |
14 | * MIDI device arbitrary. | |
15 | * Also, multiple access is allowed to a single rawmidi device. | |
16 | * | |
17 | * Typical usage is like following: | |
18 | * - Load snd-virmidi module. | |
19 | * # modprobe snd-virmidi index=2 | |
20 | * Then, sequencer clients 72:0 to 75:0 will be created, which are | |
21 | * mapped from /dev/snd/midiC1D0 to /dev/snd/midiC1D3, respectively. | |
22 | * | |
23 | * - Connect input/output via aconnect. | |
24 | * % aconnect 64:0 72:0 # keyboard input redirection 64:0 -> 72:0 | |
25 | * % aconnect 72:0 65:0 # output device redirection 72:0 -> 65:0 | |
26 | * | |
27 | * - Run application using a midi device (eg. /dev/snd/midiC1D0) | |
28 | */ | |
29 | ||
1da177e4 LT |
30 | #include <linux/init.h> |
31 | #include <linux/wait.h> | |
3564fbb8 TI |
32 | #include <linux/err.h> |
33 | #include <linux/platform_device.h> | |
65a77217 | 34 | #include <linux/module.h> |
1da177e4 LT |
35 | #include <sound/core.h> |
36 | #include <sound/seq_kernel.h> | |
37 | #include <sound/seq_virmidi.h> | |
38 | #include <sound/initval.h> | |
39 | ||
40 | /* hack: OSS defines midi_devs, so undefine it (versioned symbols) */ | |
41 | #undef midi_devs | |
42 | ||
43 | MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); | |
44 | MODULE_DESCRIPTION("Dummy soundcard for virtual rawmidi devices"); | |
45 | MODULE_LICENSE("GPL"); | |
1da177e4 | 46 | |
204bdb1b | 47 | #define MAX_MIDI_DEVICES 4 |
1da177e4 LT |
48 | |
49 | static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ | |
50 | static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ | |
a67ff6a5 | 51 | static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; |
1da177e4 LT |
52 | static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 4}; |
53 | ||
54 | module_param_array(index, int, NULL, 0444); | |
55 | MODULE_PARM_DESC(index, "Index value for virmidi soundcard."); | |
56 | module_param_array(id, charp, NULL, 0444); | |
57 | MODULE_PARM_DESC(id, "ID string for virmidi soundcard."); | |
58 | module_param_array(enable, bool, NULL, 0444); | |
59 | MODULE_PARM_DESC(enable, "Enable this soundcard."); | |
60 | module_param_array(midi_devs, int, NULL, 0444); | |
204bdb1b | 61 | MODULE_PARM_DESC(midi_devs, "MIDI devices # (1-4)"); |
1da177e4 | 62 | |
4a4d2cfd TI |
63 | struct snd_card_virmidi { |
64 | struct snd_card *card; | |
65 | struct snd_rawmidi *midi[MAX_MIDI_DEVICES]; | |
66 | }; | |
1da177e4 | 67 | |
f7a9275d CL |
68 | static struct platform_device *devices[SNDRV_CARDS]; |
69 | ||
1da177e4 | 70 | |
fbbb01a1 | 71 | static int snd_virmidi_probe(struct platform_device *devptr) |
1da177e4 | 72 | { |
4a4d2cfd | 73 | struct snd_card *card; |
1da177e4 LT |
74 | struct snd_card_virmidi *vmidi; |
75 | int idx, err; | |
3564fbb8 | 76 | int dev = devptr->id; |
1da177e4 | 77 | |
ed539fc3 TI |
78 | err = snd_devm_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE, |
79 | sizeof(struct snd_card_virmidi), &card); | |
bd7dd77c TI |
80 | if (err < 0) |
81 | return err; | |
9fe856e4 | 82 | vmidi = card->private_data; |
1da177e4 LT |
83 | vmidi->card = card; |
84 | ||
85 | if (midi_devs[dev] > MAX_MIDI_DEVICES) { | |
45203832 | 86 | snd_printk(KERN_WARNING |
316638a5 KC |
87 | "too much midi devices for virmidi %d: force to use %d\n", |
88 | dev, MAX_MIDI_DEVICES); | |
1da177e4 LT |
89 | midi_devs[dev] = MAX_MIDI_DEVICES; |
90 | } | |
91 | for (idx = 0; idx < midi_devs[dev]; idx++) { | |
4a4d2cfd | 92 | struct snd_rawmidi *rmidi; |
316638a5 KC |
93 | |
94 | err = snd_virmidi_new(card, idx, &rmidi); | |
95 | if (err < 0) | |
ed539fc3 | 96 | return err; |
1da177e4 LT |
97 | vmidi->midi[idx] = rmidi; |
98 | strcpy(rmidi->name, "Virtual Raw MIDI"); | |
1da177e4 | 99 | } |
316638a5 | 100 | |
1da177e4 LT |
101 | strcpy(card->driver, "VirMIDI"); |
102 | strcpy(card->shortname, "VirMIDI"); | |
103 | sprintf(card->longname, "Virtual MIDI Card %i", dev + 1); | |
16dab54b | 104 | |
316638a5 | 105 | err = snd_card_register(card); |
ed539fc3 TI |
106 | if (err) |
107 | return err; | |
1da177e4 | 108 | |
ed539fc3 | 109 | platform_set_drvdata(devptr, card); |
3564fbb8 TI |
110 | return 0; |
111 | } | |
1da177e4 | 112 | |
3564fbb8 TI |
113 | #define SND_VIRMIDI_DRIVER "snd_virmidi" |
114 | ||
115 | static struct platform_driver snd_virmidi_driver = { | |
116 | .probe = snd_virmidi_probe, | |
3564fbb8 | 117 | .driver = { |
8bf01d8a | 118 | .name = SND_VIRMIDI_DRIVER, |
3564fbb8 TI |
119 | }, |
120 | }; | |
121 | ||
bdec0c72 | 122 | static void snd_virmidi_unregister_all(void) |
f7a9275d CL |
123 | { |
124 | int i; | |
125 | ||
126 | for (i = 0; i < ARRAY_SIZE(devices); ++i) | |
127 | platform_device_unregister(devices[i]); | |
128 | platform_driver_unregister(&snd_virmidi_driver); | |
129 | } | |
130 | ||
3564fbb8 TI |
131 | static int __init alsa_card_virmidi_init(void) |
132 | { | |
133 | int i, cards, err; | |
134 | ||
316638a5 KC |
135 | err = platform_driver_register(&snd_virmidi_driver); |
136 | if (err < 0) | |
3564fbb8 TI |
137 | return err; |
138 | ||
139 | cards = 0; | |
8278ca8f | 140 | for (i = 0; i < SNDRV_CARDS; i++) { |
3564fbb8 | 141 | struct platform_device *device; |
316638a5 KC |
142 | |
143 | if (!enable[i]) | |
8278ca8f | 144 | continue; |
3564fbb8 TI |
145 | device = platform_device_register_simple(SND_VIRMIDI_DRIVER, |
146 | i, NULL, 0); | |
a182ee98 RH |
147 | if (IS_ERR(device)) |
148 | continue; | |
7152447d RH |
149 | if (!platform_get_drvdata(device)) { |
150 | platform_device_unregister(device); | |
151 | continue; | |
152 | } | |
f7a9275d | 153 | devices[i] = device; |
1da177e4 LT |
154 | cards++; |
155 | } | |
156 | if (!cards) { | |
157 | #ifdef MODULE | |
158 | printk(KERN_ERR "Card-VirMIDI soundcard not found or device busy\n"); | |
159 | #endif | |
a182ee98 RH |
160 | snd_virmidi_unregister_all(); |
161 | return -ENODEV; | |
1da177e4 LT |
162 | } |
163 | return 0; | |
164 | } | |
165 | ||
166 | static void __exit alsa_card_virmidi_exit(void) | |
167 | { | |
f7a9275d | 168 | snd_virmidi_unregister_all(); |
1da177e4 LT |
169 | } |
170 | ||
171 | module_init(alsa_card_virmidi_init) | |
172 | module_exit(alsa_card_virmidi_exit) |