diff options
Diffstat (limited to 'sound/drivers/virmidi.c')
| -rw-r--r-- | sound/drivers/virmidi.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/sound/drivers/virmidi.c b/sound/drivers/virmidi.c new file mode 100644 index 000000000000..5937711e9505 --- /dev/null +++ b/sound/drivers/virmidi.c @@ -0,0 +1,159 @@ +/* + * 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)"); + +typedef struct snd_card_virmidi { + snd_card_t *card; + snd_rawmidi_t *midi[MAX_MIDI_DEVICES]; +} snd_card_virmidi_t; + +static snd_card_t *snd_virmidi_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR; + + +static int __init snd_card_virmidi_probe(int dev) +{ + snd_card_t *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++) { + snd_rawmidi_t *rmidi; + snd_virmidi_dev_t *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_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) |