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172 lines
4.5 KiB
172 lines
4.5 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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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_devm_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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err = snd_virmidi_new(card, idx, &rmidi); |
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if (err < 0) |
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return err; |
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vmidi->midi[idx] = rmidi; |
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strcpy(rmidi->name, "Virtual Raw MIDI"); |
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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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return err; |
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platform_set_drvdata(devptr, card); |
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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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.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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