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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 | /* * 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/sched.h> #include <sound/core.h> #include <sound/seq_kernel.h> #include <sound/seq_virmidi.h> #define SNDRV_GET_ID #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_CLASSES("{sound}"); MODULE_DEVICES("{{ALSA,Virtual rawmidi device}}"); #define MAX_MIDI_DEVICES 8 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_PARM(index, "1-" __MODULE_STRING(SNDRV_CARDS) "i"); MODULE_PARM_DESC(index, "Index value for virmidi soundcard."); MODULE_PARM_SYNTAX(index, SNDRV_INDEX_DESC); MODULE_PARM(id, "1-" __MODULE_STRING(SNDRV_CARDS) "s"); MODULE_PARM_DESC(id, "ID string for virmidi soundcard."); MODULE_PARM_SYNTAX(id, SNDRV_ID_DESC); MODULE_PARM(enable, "1-" __MODULE_STRING(SNDRV_CARDS) "i"); MODULE_PARM_DESC(enable, "Enable this soundcard."); MODULE_PARM_SYNTAX(enable, SNDRV_ENABLE_DESC); MODULE_PARM(midi_devs, "1-" __MODULE_STRING(SNDRV_CARDS) "i"); MODULE_PARM_DESC(midi_devs, "MIDI devices # (1-8)"); MODULE_PARM_SYNTAX(midi_devs, SNDRV_ENABLED ",allows:{{1,8}}"); typedef struct snd_card_virmidi { snd_card_t *card; snd_rawmidi_t *midi[MAX_MIDI_DEVICES]; } snd_card_virmidi_t; static snd_card_t *snd_virmidi_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR; static int __init snd_card_virmidi_probe(int dev) { snd_card_t *card; struct snd_card_virmidi *vmidi; int idx, err; if (!enable[dev]) return -ENODEV; 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++) { snd_rawmidi_t *rmidi; snd_virmidi_dev_t *rdev; if ((err = snd_virmidi_new(card, idx, &rmidi)) < 0) goto __nodev; rdev = snd_magic_cast(snd_virmidi_dev_t, rmidi->private_data, continue); 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); if ((err = snd_card_register(card)) == 0) { snd_virmidi_cards[dev] = card; return 0; } __nodev: snd_card_free(card); return err; } static int __init alsa_card_virmidi_init(void) { int dev, cards; for (dev = cards = 0; dev < SNDRV_CARDS && enable[dev]; dev++) { if (snd_card_virmidi_probe(dev) < 0) { #ifdef MODULE printk(KERN_ERR "Card-VirMIDI #%i not found or device busy\n", dev + 1); #endif break; } cards++; } if (!cards) { #ifdef MODULE printk(KERN_ERR "Card-VirMIDI soundcard not found or device busy\n"); #endif return -ENODEV; } return 0; } static void __exit alsa_card_virmidi_exit(void) { int dev; for (dev = 0; dev < SNDRV_CARDS; dev++) snd_card_free(snd_virmidi_cards[dev]); } module_init(alsa_card_virmidi_init) module_exit(alsa_card_virmidi_exit) #ifndef MODULE /* format is: snd-virmidi=enable,index,id,midi_devs */ static int __init alsa_card_virmidi_setup(char *str) { static unsigned __initdata nr_dev = 0; if (nr_dev >= SNDRV_CARDS) return 0; (void)(get_option(&str,&enable[nr_dev]) == 2 && get_option(&str,&index[nr_dev]) == 2 && get_id(&str,&id[nr_dev]) == 2 && get_option(&str,&midi_devs[nr_dev]) == 2); nr_dev++; return 1; } __setup("snd-virmidi=", alsa_card_virmidi_setup); #endif /* ifndef MODULE */ |