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