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)