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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)

 */

#include <sound/driver.h>

#include <linux/init.h>

#include <linux/wait.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        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 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 # (1-4)");

struct snd_card_virmidi {

        struct snd_card *card;

        struct snd_rawmidi *midi[MAX_MIDI_DEVICES];

};

static struct platform_device *devices[SNDRV_CARDS];

static int __devinit 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 __devexit 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         = __devexit_p(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;

        if ((err = platform_driver_register(&snd_virmidi_driver)) < 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)