linux/sound/drivers/virmidi.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

186 lines
4.8 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Dummy soundcard for virtual rawmidi devices
*
* Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de>
*/
/*
* 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)