fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / sound / drivers / virmidi.c
blob915c86773c21fbe0a4635a9f5508c2537834f1a8
1 /*
2 * Dummy soundcard for virtual rawmidi devices
4 * Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de>
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.
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.
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
23 * VIRTUAL RAW MIDI DEVICE CARDS
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.
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.
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
41 * - Run application using a midi device (eg. /dev/snd/midiC1D0)
44 #include <sound/driver.h>
45 #include <linux/init.h>
46 #include <linux/wait.h>
47 #include <linux/err.h>
48 #include <linux/platform_device.h>
49 #include <linux/moduleparam.h>
50 #include <sound/core.h>
51 #include <sound/seq_kernel.h>
52 #include <sound/seq_virmidi.h>
53 #include <sound/initval.h>
55 /* hack: OSS defines midi_devs, so undefine it (versioned symbols) */
56 #undef midi_devs
58 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
59 MODULE_DESCRIPTION("Dummy soundcard for virtual rawmidi devices");
60 MODULE_LICENSE("GPL");
61 MODULE_SUPPORTED_DEVICE("{{ALSA,Virtual rawmidi device}}");
63 #define MAX_MIDI_DEVICES 4
65 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
66 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
67 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
68 static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 4};
70 module_param_array(index, int, NULL, 0444);
71 MODULE_PARM_DESC(index, "Index value for virmidi soundcard.");
72 module_param_array(id, charp, NULL, 0444);
73 MODULE_PARM_DESC(id, "ID string for virmidi soundcard.");
74 module_param_array(enable, bool, NULL, 0444);
75 MODULE_PARM_DESC(enable, "Enable this soundcard.");
76 module_param_array(midi_devs, int, NULL, 0444);
77 MODULE_PARM_DESC(midi_devs, "MIDI devices # (1-4)");
79 struct snd_card_virmidi {
80 struct snd_card *card;
81 struct snd_rawmidi *midi[MAX_MIDI_DEVICES];
84 static struct platform_device *devices[SNDRV_CARDS];
87 static int __devinit snd_virmidi_probe(struct platform_device *devptr)
89 struct snd_card *card;
90 struct snd_card_virmidi *vmidi;
91 int idx, err;
92 int dev = devptr->id;
94 card = snd_card_new(index[dev], id[dev], THIS_MODULE,
95 sizeof(struct snd_card_virmidi));
96 if (card == NULL)
97 return -ENOMEM;
98 vmidi = (struct snd_card_virmidi *)card->private_data;
99 vmidi->card = card;
101 if (midi_devs[dev] > MAX_MIDI_DEVICES) {
102 snd_printk("too much midi devices for virmidi %d: force to use %d\n", dev, MAX_MIDI_DEVICES);
103 midi_devs[dev] = MAX_MIDI_DEVICES;
105 for (idx = 0; idx < midi_devs[dev]; idx++) {
106 struct snd_rawmidi *rmidi;
107 struct snd_virmidi_dev *rdev;
108 if ((err = snd_virmidi_new(card, idx, &rmidi)) < 0)
109 goto __nodev;
110 rdev = rmidi->private_data;
111 vmidi->midi[idx] = rmidi;
112 strcpy(rmidi->name, "Virtual Raw MIDI");
113 rdev->seq_mode = SNDRV_VIRMIDI_SEQ_DISPATCH;
116 strcpy(card->driver, "VirMIDI");
117 strcpy(card->shortname, "VirMIDI");
118 sprintf(card->longname, "Virtual MIDI Card %i", dev + 1);
120 snd_card_set_dev(card, &devptr->dev);
122 if ((err = snd_card_register(card)) == 0) {
123 platform_set_drvdata(devptr, card);
124 return 0;
126 __nodev:
127 snd_card_free(card);
128 return err;
131 static int __devexit snd_virmidi_remove(struct platform_device *devptr)
133 snd_card_free(platform_get_drvdata(devptr));
134 platform_set_drvdata(devptr, NULL);
135 return 0;
138 #define SND_VIRMIDI_DRIVER "snd_virmidi"
140 static struct platform_driver snd_virmidi_driver = {
141 .probe = snd_virmidi_probe,
142 .remove = __devexit_p(snd_virmidi_remove),
143 .driver = {
144 .name = SND_VIRMIDI_DRIVER
148 static void snd_virmidi_unregister_all(void)
150 int i;
152 for (i = 0; i < ARRAY_SIZE(devices); ++i)
153 platform_device_unregister(devices[i]);
154 platform_driver_unregister(&snd_virmidi_driver);
157 static int __init alsa_card_virmidi_init(void)
159 int i, cards, err;
161 if ((err = platform_driver_register(&snd_virmidi_driver)) < 0)
162 return err;
164 cards = 0;
165 for (i = 0; i < SNDRV_CARDS; i++) {
166 struct platform_device *device;
167 if (! enable[i])
168 continue;
169 device = platform_device_register_simple(SND_VIRMIDI_DRIVER,
170 i, NULL, 0);
171 if (IS_ERR(device))
172 continue;
173 if (!platform_get_drvdata(device)) {
174 platform_device_unregister(device);
175 continue;
177 devices[i] = device;
178 cards++;
180 if (!cards) {
181 #ifdef MODULE
182 printk(KERN_ERR "Card-VirMIDI soundcard not found or device busy\n");
183 #endif
184 snd_virmidi_unregister_all();
185 return -ENODEV;
187 return 0;
190 static void __exit alsa_card_virmidi_exit(void)
192 snd_virmidi_unregister_all();
195 module_init(alsa_card_virmidi_init)
196 module_exit(alsa_card_virmidi_exit)