| /* |
| * 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/err.h> |
| #include <linux/platform_device.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 int __init snd_virmidi_probe(struct platform_device *devptr) |
| { |
| struct snd_card *card; |
| struct snd_card_virmidi *vmidi; |
| int idx, err; |
| int dev = devptr->id; |
| |
| 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); |
| |
| snd_card_set_dev(card, &devptr->dev); |
| |
| if ((err = snd_card_register(card)) == 0) { |
| platform_set_drvdata(devptr, card); |
| return 0; |
| } |
| __nodev: |
| snd_card_free(card); |
| return err; |
| } |
| |
| static int snd_virmidi_remove(struct platform_device *devptr) |
| { |
| snd_card_free(platform_get_drvdata(devptr)); |
| platform_set_drvdata(devptr, NULL); |
| return 0; |
| } |
| |
| #define SND_VIRMIDI_DRIVER "snd_virmidi" |
| |
| static struct platform_driver snd_virmidi_driver = { |
| .probe = snd_virmidi_probe, |
| .remove = snd_virmidi_remove, |
| .driver = { |
| .name = SND_VIRMIDI_DRIVER |
| }, |
| }; |
| |
| static int __init alsa_card_virmidi_init(void) |
| { |
| int i, cards, err; |
| |
| if ((err = platform_driver_register(&snd_virmidi_driver)) < 0) |
| return err; |
| |
| cards = 0; |
| for (i = 0; i < SNDRV_CARDS && enable[i]; i++) { |
| struct platform_device *device; |
| device = platform_device_register_simple(SND_VIRMIDI_DRIVER, |
| i, NULL, 0); |
| if (IS_ERR(device)) { |
| err = PTR_ERR(device); |
| goto errout; |
| } |
| cards++; |
| } |
| if (!cards) { |
| #ifdef MODULE |
| printk(KERN_ERR "Card-VirMIDI soundcard not found or device busy\n"); |
| #endif |
| err = -ENODEV; |
| goto errout; |
| } |
| return 0; |
| |
| errout: |
| platform_driver_unregister(&snd_virmidi_driver); |
| return err; |
| } |
| |
| static void __exit alsa_card_virmidi_exit(void) |
| { |
| platform_driver_unregister(&snd_virmidi_driver); |
| } |
| |
| module_init(alsa_card_virmidi_init) |
| module_exit(alsa_card_virmidi_exit) |