--- /dev/null
+/*
+ * 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 <linux/init.h>
+#include <linux/wait.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/module.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 4
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
+static bool 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 # (1-4)");
+
+struct snd_card_virmidi {
+ struct snd_card *card;
+ struct snd_rawmidi *midi[MAX_MIDI_DEVICES];
+};
+
+static struct platform_device *devices[SNDRV_CARDS];
+
+
+static int snd_virmidi_probe(struct platform_device *devptr)
+{
+ struct snd_card *card;
+ struct snd_card_virmidi *vmidi;
+ int idx, err;
+ int dev = devptr->id;
+
+ err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
+ sizeof(struct snd_card_virmidi), &card);
+ if (err < 0)
+ return err;
+ vmidi = card->private_data;
+ vmidi->card = card;
+
+ if (midi_devs[dev] > MAX_MIDI_DEVICES) {
+ snd_printk(KERN_WARNING
+ "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;
+
+ err = snd_virmidi_new(card, idx, &rmidi);
+ if (err < 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);
+
+ err = snd_card_register(card);
+ if (!err) {
+ 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));
+ 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 void snd_virmidi_unregister_all(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(devices); ++i)
+ platform_device_unregister(devices[i]);
+ platform_driver_unregister(&snd_virmidi_driver);
+}
+
+static int __init alsa_card_virmidi_init(void)
+{
+ int i, cards, err;
+
+ err = platform_driver_register(&snd_virmidi_driver);
+ if (err < 0)
+ return err;
+
+ cards = 0;
+ for (i = 0; i < SNDRV_CARDS; i++) {
+ struct platform_device *device;
+
+ if (!enable[i])
+ continue;
+ device = platform_device_register_simple(SND_VIRMIDI_DRIVER,
+ i, NULL, 0);
+ if (IS_ERR(device))
+ continue;
+ if (!platform_get_drvdata(device)) {
+ platform_device_unregister(device);
+ continue;
+ }
+ devices[i] = device;
+ cards++;
+ }
+ if (!cards) {
+#ifdef MODULE
+ printk(KERN_ERR "Card-VirMIDI soundcard not found or device busy\n");
+#endif
+ snd_virmidi_unregister_all();
+ return -ENODEV;
+ }
+ return 0;
+}
+
+static void __exit alsa_card_virmidi_exit(void)
+{
+ snd_virmidi_unregister_all();
+}
+
+module_init(alsa_card_virmidi_init)
+module_exit(alsa_card_virmidi_exit)
Code Review / kvmfornfv.git / blobdiff