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/*
* Dummy soundcard for virtual rawmidi devices
*
* Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*
* VIRTUAL RAW MIDI DEVICE CARDS
*
* This dummy card contains up to 4 virtual rawmidi devices.
* They are not real rawmidi devices but just associated with sequencer
* clients, so that any input/output sources can be connected as a raw
* MIDI device arbitrary.
* Also, multiple access is allowed to a single rawmidi device.
*
* Typical usage is like following:
* - Load snd-virmidi module.
* # modprobe snd-virmidi index=2
* Then, sequencer clients 72:0 to 75:0 will be created, which are
* mapped from /dev/snd/midiC1D0 to /dev/snd/midiC1D3, respectively.
*
* - Connect input/output via aconnect.
* % aconnect 64:0 72:0 # keyboard input redirection 64:0 -> 72:0
* % aconnect 72:0 65:0 # output device redirection 72:0 -> 65:0
*
* - Run application using a midi device (eg. /dev/snd/midiC1D0)
*/
#include <sound/driver.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/moduleparam.h>
#include <sound/core.h>
#include <sound/seq_kernel.h>
#include <sound/seq_virmidi.h>
#include <sound/initval.h>
/* hack: OSS defines midi_devs, so undefine it (versioned symbols) */
#undef midi_devs
MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
MODULE_DESCRIPTION("Dummy soundcard for virtual rawmidi devices");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{ALSA,Virtual rawmidi device}}");
#define MAX_MIDI_DEVICES 8
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 4};
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for virmidi soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for virmidi soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable this soundcard.");
module_param_array(midi_devs, int, NULL, 0444);
MODULE_PARM_DESC(midi_devs, "MIDI devices # (1-8)");
struct snd_card_virmidi {
struct snd_card *card;
struct snd_rawmidi *midi[MAX_MIDI_DEVICES];
};
static struct snd_card *snd_virmidi_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
static int __init snd_card_virmidi_probe(int dev)
{
struct snd_card *card;
struct snd_card_virmidi *vmidi;
int idx, err;
if (!enable[dev])
return -ENODEV;
card = snd_card_new(index[dev], id[dev], THIS_MODULE,
sizeof(struct snd_card_virmidi));
if (card == NULL)
return -ENOMEM;
vmidi = (struct snd_card_virmidi *)card->private_data;
vmidi->card = card;
if (midi_devs[dev] > MAX_MIDI_DEVICES) {
snd_printk("too much midi devices for virmidi %d: force to use %d\n", dev, MAX_MIDI_DEVICES);
midi_devs[dev] = MAX_MIDI_DEVICES;
}
for (idx = 0; idx < midi_devs[dev]; idx++) {
struct snd_rawmidi *rmidi;
struct snd_virmidi_dev *rdev;
if ((err = snd_virmidi_new(card, idx, &rmidi)) < 0)
goto __nodev;
rdev = rmidi->private_data;
vmidi->midi[idx] = rmidi;
strcpy(rmidi->name, "Virtual Raw MIDI");
rdev->seq_mode = SNDRV_VIRMIDI_SEQ_DISPATCH;
}
strcpy(card->driver, "VirMIDI");
strcpy(card->shortname, "VirMIDI");
sprintf(card->longname, "Virtual MIDI Card %i", dev + 1);
if ((err = snd_card_set_generic_dev(card)) < 0)
goto __nodev;
if ((err = snd_card_register(card)) == 0) {
snd_virmidi_cards[dev] = card;
return 0;
}
__nodev:
snd_card_free(card);
return err;
}
static int __init alsa_card_virmidi_init(void)
{
int dev, cards;
for (dev = cards = 0; dev < SNDRV_CARDS && enable[dev]; dev++) {
if (snd_card_virmidi_probe(dev) < 0) {
#ifdef MODULE
printk(KERN_ERR "Card-VirMIDI #%i not found or device busy\n", dev + 1);
#endif
break;
}
cards++;
}
if (!cards) {
#ifdef MODULE
printk(KERN_ERR "Card-VirMIDI soundcard not found or device busy\n");
#endif
return -ENODEV;
}
return 0;
}
static void __exit alsa_card_virmidi_exit(void)
{
int dev;
for (dev = 0; dev < SNDRV_CARDS; dev++)
snd_card_free(snd_virmidi_cards[dev]);
}
module_init(alsa_card_virmidi_init)
module_exit(alsa_card_virmidi_exit)
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