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sound/drivers/virmidi.c
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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) */ |
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#include <linux/init.h> #include <linux/wait.h> |
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#include <linux/err.h> #include <linux/platform_device.h> |
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#include <linux/module.h> |
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#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}}"); |
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#define MAX_MIDI_DEVICES 4 |
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ |
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static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; |
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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); |
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MODULE_PARM_DESC(midi_devs, "MIDI devices # (1-4)"); |
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struct snd_card_virmidi { struct snd_card *card; struct snd_rawmidi *midi[MAX_MIDI_DEVICES]; }; |
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static struct platform_device *devices[SNDRV_CARDS]; |
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static int snd_virmidi_probe(struct platform_device *devptr) |
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{ |
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struct snd_card *card; |
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struct snd_card_virmidi *vmidi; int idx, err; |
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int dev = devptr->id; |
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err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE, sizeof(struct snd_card_virmidi), &card); |
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if (err < 0) return err; |
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vmidi = card->private_data; |
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vmidi->card = card; if (midi_devs[dev] > MAX_MIDI_DEVICES) { |
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snd_printk(KERN_WARNING |
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"too much midi devices for virmidi %d: force to use %d ", dev, MAX_MIDI_DEVICES); |
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midi_devs[dev] = MAX_MIDI_DEVICES; } for (idx = 0; idx < midi_devs[dev]; idx++) { |
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struct snd_rawmidi *rmidi; struct snd_virmidi_dev *rdev; |
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err = snd_virmidi_new(card, idx, &rmidi); if (err < 0) |
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goto __nodev; rdev = rmidi->private_data; vmidi->midi[idx] = rmidi; strcpy(rmidi->name, "Virtual Raw MIDI"); rdev->seq_mode = SNDRV_VIRMIDI_SEQ_DISPATCH; } |
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strcpy(card->driver, "VirMIDI"); strcpy(card->shortname, "VirMIDI"); sprintf(card->longname, "Virtual MIDI Card %i", dev + 1); |
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err = snd_card_register(card); |
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if (!err) { |
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platform_set_drvdata(devptr, card); |
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return 0; } |
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__nodev: |
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snd_card_free(card); return err; } |
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static int snd_virmidi_remove(struct platform_device *devptr) |
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{ |
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snd_card_free(platform_get_drvdata(devptr)); |
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return 0; } |
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#define SND_VIRMIDI_DRIVER "snd_virmidi" static struct platform_driver snd_virmidi_driver = { .probe = snd_virmidi_probe, |
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.remove = snd_virmidi_remove, |
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.driver = { |
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.name = SND_VIRMIDI_DRIVER, |
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}, }; |
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static void snd_virmidi_unregister_all(void) |
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{ int i; for (i = 0; i < ARRAY_SIZE(devices); ++i) platform_device_unregister(devices[i]); platform_driver_unregister(&snd_virmidi_driver); } |
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static int __init alsa_card_virmidi_init(void) { int i, cards, err; |
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err = platform_driver_register(&snd_virmidi_driver); if (err < 0) |
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return err; cards = 0; |
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for (i = 0; i < SNDRV_CARDS; i++) { |
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struct platform_device *device; |
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if (!enable[i]) |
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continue; |
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device = platform_device_register_simple(SND_VIRMIDI_DRIVER, i, NULL, 0); |
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if (IS_ERR(device)) continue; |
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if (!platform_get_drvdata(device)) { platform_device_unregister(device); continue; } |
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devices[i] = device; |
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cards++; } if (!cards) { #ifdef MODULE printk(KERN_ERR "Card-VirMIDI soundcard not found or device busy "); #endif |
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snd_virmidi_unregister_all(); return -ENODEV; |
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} return 0; } static void __exit alsa_card_virmidi_exit(void) { |
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snd_virmidi_unregister_all(); |
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} module_init(alsa_card_virmidi_init) module_exit(alsa_card_virmidi_exit) |