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6417f03132
MODULE_SUPPORTED_DEVICE was added in pre-git era and never was implemented. We can safely remove it, because the kernel has grown to have many more reliable mechanisms to determine if device is supported or not. Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
185 lines
4.8 KiB
C
185 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Dummy soundcard for virtual rawmidi devices
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*
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* Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de>
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*/
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/*
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* VIRTUAL RAW MIDI DEVICE CARDS
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*
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* This dummy card contains up to 4 virtual rawmidi devices.
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* They are not real rawmidi devices but just associated with sequencer
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* clients, so that any input/output sources can be connected as a raw
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* MIDI device arbitrary.
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* Also, multiple access is allowed to a single rawmidi device.
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*
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* Typical usage is like following:
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* - Load snd-virmidi module.
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* # modprobe snd-virmidi index=2
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* Then, sequencer clients 72:0 to 75:0 will be created, which are
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* mapped from /dev/snd/midiC1D0 to /dev/snd/midiC1D3, respectively.
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*
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* - Connect input/output via aconnect.
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* % aconnect 64:0 72:0 # keyboard input redirection 64:0 -> 72:0
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* % aconnect 72:0 65:0 # output device redirection 72:0 -> 65:0
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*
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* - Run application using a midi device (eg. /dev/snd/midiC1D0)
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*/
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#include <linux/init.h>
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#include <linux/wait.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <sound/core.h>
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#include <sound/seq_kernel.h>
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#include <sound/seq_virmidi.h>
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#include <sound/initval.h>
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/* hack: OSS defines midi_devs, so undefine it (versioned symbols) */
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#undef midi_devs
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MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
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MODULE_DESCRIPTION("Dummy soundcard for virtual rawmidi devices");
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MODULE_LICENSE("GPL");
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#define MAX_MIDI_DEVICES 4
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
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static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
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static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
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static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 4};
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module_param_array(index, int, NULL, 0444);
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MODULE_PARM_DESC(index, "Index value for virmidi soundcard.");
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module_param_array(id, charp, NULL, 0444);
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MODULE_PARM_DESC(id, "ID string for virmidi soundcard.");
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module_param_array(enable, bool, NULL, 0444);
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MODULE_PARM_DESC(enable, "Enable this soundcard.");
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module_param_array(midi_devs, int, NULL, 0444);
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MODULE_PARM_DESC(midi_devs, "MIDI devices # (1-4)");
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struct snd_card_virmidi {
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struct snd_card *card;
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struct snd_rawmidi *midi[MAX_MIDI_DEVICES];
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};
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static struct platform_device *devices[SNDRV_CARDS];
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static int snd_virmidi_probe(struct platform_device *devptr)
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{
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struct snd_card *card;
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struct snd_card_virmidi *vmidi;
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int idx, err;
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int dev = devptr->id;
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err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
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sizeof(struct snd_card_virmidi), &card);
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if (err < 0)
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return err;
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vmidi = card->private_data;
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vmidi->card = card;
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if (midi_devs[dev] > MAX_MIDI_DEVICES) {
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snd_printk(KERN_WARNING
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"too much midi devices for virmidi %d: force to use %d\n",
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dev, MAX_MIDI_DEVICES);
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midi_devs[dev] = MAX_MIDI_DEVICES;
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}
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for (idx = 0; idx < midi_devs[dev]; idx++) {
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struct snd_rawmidi *rmidi;
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struct snd_virmidi_dev *rdev;
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err = snd_virmidi_new(card, idx, &rmidi);
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if (err < 0)
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goto __nodev;
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rdev = rmidi->private_data;
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vmidi->midi[idx] = rmidi;
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strcpy(rmidi->name, "Virtual Raw MIDI");
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rdev->seq_mode = SNDRV_VIRMIDI_SEQ_DISPATCH;
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}
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strcpy(card->driver, "VirMIDI");
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strcpy(card->shortname, "VirMIDI");
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sprintf(card->longname, "Virtual MIDI Card %i", dev + 1);
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err = snd_card_register(card);
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if (!err) {
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platform_set_drvdata(devptr, card);
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return 0;
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}
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__nodev:
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snd_card_free(card);
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return err;
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}
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static int snd_virmidi_remove(struct platform_device *devptr)
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{
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snd_card_free(platform_get_drvdata(devptr));
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return 0;
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}
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#define SND_VIRMIDI_DRIVER "snd_virmidi"
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static struct platform_driver snd_virmidi_driver = {
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.probe = snd_virmidi_probe,
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.remove = snd_virmidi_remove,
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.driver = {
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.name = SND_VIRMIDI_DRIVER,
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},
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};
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static void snd_virmidi_unregister_all(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(devices); ++i)
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platform_device_unregister(devices[i]);
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platform_driver_unregister(&snd_virmidi_driver);
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}
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static int __init alsa_card_virmidi_init(void)
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{
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int i, cards, err;
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err = platform_driver_register(&snd_virmidi_driver);
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if (err < 0)
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return err;
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cards = 0;
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for (i = 0; i < SNDRV_CARDS; i++) {
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struct platform_device *device;
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if (!enable[i])
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continue;
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device = platform_device_register_simple(SND_VIRMIDI_DRIVER,
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i, NULL, 0);
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if (IS_ERR(device))
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continue;
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if (!platform_get_drvdata(device)) {
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platform_device_unregister(device);
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continue;
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}
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devices[i] = device;
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cards++;
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}
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if (!cards) {
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#ifdef MODULE
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printk(KERN_ERR "Card-VirMIDI soundcard not found or device busy\n");
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#endif
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snd_virmidi_unregister_all();
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return -ENODEV;
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}
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return 0;
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}
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static void __exit alsa_card_virmidi_exit(void)
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{
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snd_virmidi_unregister_all();
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}
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module_init(alsa_card_virmidi_init)
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module_exit(alsa_card_virmidi_exit)
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