cregit-Linux how code gets into the kernel

Release 4.7 sound/drivers/virmidi.c

Directory: sound/drivers
/*
 *  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; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela20880.93%327.27%
takashi iwaitakashi iwai4015.56%763.64%
kyle chamberlinkyle chamberlin93.50%19.09%
Total257100.00%11100.00%


static int snd_virmidi_remove(struct platform_device *devptr) { snd_card_free(platform_get_drvdata(devptr)); return 0; }

Contributors

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takashi iwaitakashi iwai22100.00%1100.00%
Total22100.00%1100.00%

#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); }

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PersonTokensPropCommitsCommitProp
clemens ladischclemens ladisch41100.00%1100.00%
Total41100.00%1100.00%


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; }

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PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela5639.72%225.00%
takashi iwaitakashi iwai5236.88%225.00%
rene hermanrene herman2215.60%225.00%
clemens ladischclemens ladisch74.96%112.50%
kyle chamberlinkyle chamberlin42.84%112.50%
Total141100.00%8100.00%


static void __exit alsa_card_virmidi_exit(void) { snd_virmidi_unregister_all(); }

Contributors

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jaroslav kyselajaroslav kysela1083.33%150.00%
clemens ladischclemens ladisch216.67%150.00%
Total12100.00%2100.00%

module_init(alsa_card_virmidi_init) module_exit(alsa_card_virmidi_exit)

Overall Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela45962.62%830.77%
takashi iwaitakashi iwai15621.28%934.62%
clemens ladischclemens ladisch7710.50%311.54%
rene hermanrene herman223.00%27.69%
kyle chamberlinkyle chamberlin131.77%13.85%
rusty russellrusty russell50.68%27.69%
paul gortmakerpaul gortmaker10.14%13.85%
Total733100.00%26100.00%
Directory: sound/drivers
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