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Linux/sound/drivers/virmidi.c

  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 bool 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 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_new(&devptr->dev, 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         if ((err = snd_card_register(card)) == 0) {
122                 platform_set_drvdata(devptr, card);
123                 return 0;
124         }
125       __nodev:
126         snd_card_free(card);
127         return err;
128 }
129 
130 static int snd_virmidi_remove(struct platform_device *devptr)
131 {
132         snd_card_free(platform_get_drvdata(devptr));
133         return 0;
134 }
135 
136 #define SND_VIRMIDI_DRIVER      "snd_virmidi"
137 
138 static struct platform_driver snd_virmidi_driver = {
139         .probe          = snd_virmidi_probe,
140         .remove         = snd_virmidi_remove,
141         .driver         = {
142                 .name   = SND_VIRMIDI_DRIVER,
143                 .owner  = THIS_MODULE,
144         },
145 };
146 
147 static void snd_virmidi_unregister_all(void)
148 {
149         int i;
150 
151         for (i = 0; i < ARRAY_SIZE(devices); ++i)
152                 platform_device_unregister(devices[i]);
153         platform_driver_unregister(&snd_virmidi_driver);
154 }
155 
156 static int __init alsa_card_virmidi_init(void)
157 {
158         int i, cards, err;
159 
160         if ((err = platform_driver_register(&snd_virmidi_driver)) < 0)
161                 return err;
162 
163         cards = 0;
164         for (i = 0; i < SNDRV_CARDS; i++) {
165                 struct platform_device *device;
166                 if (! enable[i])
167                         continue;
168                 device = platform_device_register_simple(SND_VIRMIDI_DRIVER,
169                                                          i, NULL, 0);
170                 if (IS_ERR(device))
171                         continue;
172                 if (!platform_get_drvdata(device)) {
173                         platform_device_unregister(device);
174                         continue;
175                 }
176                 devices[i] = device;
177                 cards++;
178         }
179         if (!cards) {
180 #ifdef MODULE
181                 printk(KERN_ERR "Card-VirMIDI soundcard not found or device busy\n");
182 #endif
183                 snd_virmidi_unregister_all();
184                 return -ENODEV;
185         }
186         return 0;
187 }
188 
189 static void __exit alsa_card_virmidi_exit(void)
190 {
191         snd_virmidi_unregister_all();
192 }
193 
194 module_init(alsa_card_virmidi_init)
195 module_exit(alsa_card_virmidi_exit)
196 

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