| 1 | /* |
| 2 | * Dummy soundcard for virtual rawmidi devices |
| 3 | * |
| 4 | * Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | * VIRTUAL RAW MIDI DEVICE CARDS |
| 24 | * |
| 25 | * This dummy card contains up to 4 virtual rawmidi devices. |
| 26 | * They are not real rawmidi devices but just associated with sequencer |
| 27 | * clients, so that any input/output sources can be connected as a raw |
| 28 | * MIDI device arbitrary. |
| 29 | * Also, multiple access is allowed to a single rawmidi device. |
| 30 | * |
| 31 | * Typical usage is like following: |
| 32 | * - Load snd-virmidi module. |
| 33 | * # modprobe snd-virmidi index=2 |
| 34 | * Then, sequencer clients 72:0 to 75:0 will be created, which are |
| 35 | * mapped from /dev/snd/midiC1D0 to /dev/snd/midiC1D3, respectively. |
| 36 | * |
| 37 | * - Connect input/output via aconnect. |
| 38 | * % aconnect 64:0 72:0 # keyboard input redirection 64:0 -> 72:0 |
| 39 | * % aconnect 72:0 65:0 # output device redirection 72:0 -> 65:0 |
| 40 | * |
| 41 | * - Run application using a midi device (eg. /dev/snd/midiC1D0) |
| 42 | */ |
| 43 | |
| 44 | #include <linux/init.h> |
| 45 | #include <linux/wait.h> |
| 46 | #include <linux/err.h> |
| 47 | #include <linux/platform_device.h> |
| 48 | #include <linux/module.h> |
| 49 | #include <sound/core.h> |
| 50 | #include <sound/seq_kernel.h> |
| 51 | #include <sound/seq_virmidi.h> |
| 52 | #include <sound/initval.h> |
| 53 | |
| 54 | /* hack: OSS defines midi_devs, so undefine it (versioned symbols) */ |
| 55 | #undef midi_devs |
| 56 | |
| 57 | MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); |
| 58 | MODULE_DESCRIPTION("Dummy soundcard for virtual rawmidi devices"); |
| 59 | MODULE_LICENSE("GPL"); |
| 60 | MODULE_SUPPORTED_DEVICE("{{ALSA,Virtual rawmidi device}}"); |
| 61 | |
| 62 | #define MAX_MIDI_DEVICES 4 |
| 63 | |
| 64 | static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ |
| 65 | static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ |
| 66 | static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; |
| 67 | static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 4}; |
| 68 | |
| 69 | module_param_array(index, int, NULL, 0444); |
| 70 | MODULE_PARM_DESC(index, "Index value for virmidi soundcard."); |
| 71 | module_param_array(id, charp, NULL, 0444); |
| 72 | MODULE_PARM_DESC(id, "ID string for virmidi soundcard."); |
| 73 | module_param_array(enable, bool, NULL, 0444); |
| 74 | MODULE_PARM_DESC(enable, "Enable this soundcard."); |
| 75 | module_param_array(midi_devs, int, NULL, 0444); |
| 76 | MODULE_PARM_DESC(midi_devs, "MIDI devices # (1-4)"); |
| 77 | |
| 78 | struct snd_card_virmidi { |
| 79 | struct snd_card *card; |
| 80 | struct snd_rawmidi *midi[MAX_MIDI_DEVICES]; |
| 81 | }; |
| 82 | |
| 83 | static struct platform_device *devices[SNDRV_CARDS]; |
| 84 | |
| 85 | |
| 86 | static int __devinit snd_virmidi_probe(struct platform_device *devptr) |
| 87 | { |
| 88 | struct snd_card *card; |
| 89 | struct snd_card_virmidi *vmidi; |
| 90 | int idx, err; |
| 91 | int dev = devptr->id; |
| 92 | |
| 93 | err = snd_card_create(index[dev], id[dev], THIS_MODULE, |
| 94 | sizeof(struct snd_card_virmidi), &card); |
| 95 | if (err < 0) |
| 96 | return err; |
| 97 | vmidi = card->private_data; |
| 98 | vmidi->card = card; |
| 99 | |
| 100 | if (midi_devs[dev] > MAX_MIDI_DEVICES) { |
| 101 | snd_printk(KERN_WARNING |
| 102 | "too much midi devices for virmidi %d: " |
| 103 | "force to use %d\n", dev, MAX_MIDI_DEVICES); |
| 104 | midi_devs[dev] = MAX_MIDI_DEVICES; |
| 105 | } |
| 106 | for (idx = 0; idx < midi_devs[dev]; idx++) { |
| 107 | struct snd_rawmidi *rmidi; |
| 108 | struct snd_virmidi_dev *rdev; |
| 109 | if ((err = snd_virmidi_new(card, idx, &rmidi)) < 0) |
| 110 | goto __nodev; |
| 111 | rdev = rmidi->private_data; |
| 112 | vmidi->midi[idx] = rmidi; |
| 113 | strcpy(rmidi->name, "Virtual Raw MIDI"); |
| 114 | rdev->seq_mode = SNDRV_VIRMIDI_SEQ_DISPATCH; |
| 115 | } |
| 116 | |
| 117 | strcpy(card->driver, "VirMIDI"); |
| 118 | strcpy(card->shortname, "VirMIDI"); |
| 119 | sprintf(card->longname, "Virtual MIDI Card %i", dev + 1); |
| 120 | |
| 121 | snd_card_set_dev(card, &devptr->dev); |
| 122 | |
| 123 | if ((err = snd_card_register(card)) == 0) { |
| 124 | platform_set_drvdata(devptr, card); |
| 125 | return 0; |
| 126 | } |
| 127 | __nodev: |
| 128 | snd_card_free(card); |
| 129 | return err; |
| 130 | } |
| 131 | |
| 132 | static int __devexit snd_virmidi_remove(struct platform_device *devptr) |
| 133 | { |
| 134 | snd_card_free(platform_get_drvdata(devptr)); |
| 135 | platform_set_drvdata(devptr, NULL); |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | #define SND_VIRMIDI_DRIVER "snd_virmidi" |
| 140 | |
| 141 | static struct platform_driver snd_virmidi_driver = { |
| 142 | .probe = snd_virmidi_probe, |
| 143 | .remove = __devexit_p(snd_virmidi_remove), |
| 144 | .driver = { |
| 145 | .name = SND_VIRMIDI_DRIVER |
| 146 | }, |
| 147 | }; |
| 148 | |
| 149 | static void snd_virmidi_unregister_all(void) |
| 150 | { |
| 151 | int i; |
| 152 | |
| 153 | for (i = 0; i < ARRAY_SIZE(devices); ++i) |
| 154 | platform_device_unregister(devices[i]); |
| 155 | platform_driver_unregister(&snd_virmidi_driver); |
| 156 | } |
| 157 | |
| 158 | static int __init alsa_card_virmidi_init(void) |
| 159 | { |
| 160 | int i, cards, err; |
| 161 | |
| 162 | if ((err = platform_driver_register(&snd_virmidi_driver)) < 0) |
| 163 | return err; |
| 164 | |
| 165 | cards = 0; |
| 166 | for (i = 0; i < SNDRV_CARDS; i++) { |
| 167 | struct platform_device *device; |
| 168 | if (! enable[i]) |
| 169 | continue; |
| 170 | device = platform_device_register_simple(SND_VIRMIDI_DRIVER, |
| 171 | i, NULL, 0); |
| 172 | if (IS_ERR(device)) |
| 173 | continue; |
| 174 | if (!platform_get_drvdata(device)) { |
| 175 | platform_device_unregister(device); |
| 176 | continue; |
| 177 | } |
| 178 | devices[i] = device; |
| 179 | cards++; |
| 180 | } |
| 181 | if (!cards) { |
| 182 | #ifdef MODULE |
| 183 | printk(KERN_ERR "Card-VirMIDI soundcard not found or device busy\n"); |
| 184 | #endif |
| 185 | snd_virmidi_unregister_all(); |
| 186 | return -ENODEV; |
| 187 | } |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | static void __exit alsa_card_virmidi_exit(void) |
| 192 | { |
| 193 | snd_virmidi_unregister_all(); |
| 194 | } |
| 195 | |
| 196 | module_init(alsa_card_virmidi_init) |
| 197 | module_exit(alsa_card_virmidi_exit) |