2 * Advanced Linux Sound Architecture
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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
22 #ifdef CONFIG_SND_OSSEMUL
24 #if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE))
25 #error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
28 #include <linux/init.h>
29 #include <linux/export.h>
30 #include <linux/slab.h>
31 #include <linux/time.h>
32 #include <sound/core.h>
33 #include <sound/minors.h>
34 #include <sound/info.h>
35 #include <linux/sound.h>
36 #include <linux/mutex.h>
38 #define SNDRV_OSS_MINORS 256
40 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
41 static DEFINE_MUTEX(sound_oss_mutex);
43 /* NOTE: This function increments the refcount of the associated card like
44 * snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
46 void *snd_lookup_oss_minor_data(unsigned int minor, int type)
48 struct snd_minor *mreg;
51 if (minor >= ARRAY_SIZE(snd_oss_minors))
53 mutex_lock(&sound_oss_mutex);
54 mreg = snd_oss_minors[minor];
55 if (mreg && mreg->type == type) {
56 private_data = mreg->private_data;
57 if (private_data && mreg->card_ptr)
58 atomic_inc(&mreg->card_ptr->refcount);
61 mutex_unlock(&sound_oss_mutex);
65 EXPORT_SYMBOL(snd_lookup_oss_minor_data);
67 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
72 case SNDRV_OSS_DEVICE_TYPE_MIXER:
73 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
75 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
77 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
78 minor = SNDRV_MINOR_OSS_SEQUENCER;
80 case SNDRV_OSS_DEVICE_TYPE_MUSIC:
81 minor = SNDRV_MINOR_OSS_MUSIC;
83 case SNDRV_OSS_DEVICE_TYPE_PCM:
84 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
86 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
88 case SNDRV_OSS_DEVICE_TYPE_MIDI:
89 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
91 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
93 case SNDRV_OSS_DEVICE_TYPE_DMFM:
94 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
96 case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
97 minor = SNDRV_MINOR_OSS_SNDSTAT;
102 if (minor < 0 || minor >= SNDRV_OSS_MINORS)
107 int snd_register_oss_device(int type, struct snd_card *card, int dev,
108 const struct file_operations *f_ops, void *private_data,
111 int minor = snd_oss_kernel_minor(type, card, dev);
113 struct snd_minor *preg;
114 int cidx = SNDRV_MINOR_OSS_CARD(minor);
116 int register1 = -1, register2 = -1;
117 struct device *carddev = snd_card_get_device_link(card);
119 if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
120 return 0; /* ignore silently */
123 preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
127 preg->card = card ? card->number : -1;
130 preg->private_data = private_data;
131 preg->card_ptr = card;
132 mutex_lock(&sound_oss_mutex);
133 snd_oss_minors[minor] = preg;
134 minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
135 switch (minor_unit) {
136 case SNDRV_MINOR_OSS_PCM:
137 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
139 case SNDRV_MINOR_OSS_MIDI:
140 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
142 case SNDRV_MINOR_OSS_MIDI1:
143 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
146 register1 = register_sound_special_device(f_ops, minor, carddev);
147 if (register1 != minor)
150 register2 = register_sound_special_device(f_ops, track2,
152 if (register2 != track2)
154 snd_oss_minors[track2] = preg;
156 mutex_unlock(&sound_oss_mutex);
161 unregister_sound_special(register2);
163 unregister_sound_special(register1);
164 snd_oss_minors[minor] = NULL;
165 mutex_unlock(&sound_oss_mutex);
170 EXPORT_SYMBOL(snd_register_oss_device);
172 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
174 int minor = snd_oss_kernel_minor(type, card, dev);
175 int cidx = SNDRV_MINOR_OSS_CARD(minor);
177 struct snd_minor *mptr;
179 if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
183 mutex_lock(&sound_oss_mutex);
184 mptr = snd_oss_minors[minor];
186 mutex_unlock(&sound_oss_mutex);
189 unregister_sound_special(minor);
190 switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
191 case SNDRV_MINOR_OSS_PCM:
192 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
194 case SNDRV_MINOR_OSS_MIDI:
195 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
197 case SNDRV_MINOR_OSS_MIDI1:
198 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
202 unregister_sound_special(track2);
203 snd_oss_minors[track2] = NULL;
205 snd_oss_minors[minor] = NULL;
206 mutex_unlock(&sound_oss_mutex);
211 EXPORT_SYMBOL(snd_unregister_oss_device);
217 #ifdef CONFIG_PROC_FS
219 static struct snd_info_entry *snd_minor_info_oss_entry;
221 static const char *snd_oss_device_type_name(int type)
224 case SNDRV_OSS_DEVICE_TYPE_MIXER:
226 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
227 case SNDRV_OSS_DEVICE_TYPE_MUSIC:
229 case SNDRV_OSS_DEVICE_TYPE_PCM:
230 return "digital audio";
231 case SNDRV_OSS_DEVICE_TYPE_MIDI:
233 case SNDRV_OSS_DEVICE_TYPE_DMFM:
234 return "hardware dependent";
240 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
241 struct snd_info_buffer *buffer)
244 struct snd_minor *mptr;
246 mutex_lock(&sound_oss_mutex);
247 for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
248 if (!(mptr = snd_oss_minors[minor]))
251 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
252 mptr->card, mptr->device,
253 snd_oss_device_type_name(mptr->type));
255 snd_iprintf(buffer, "%3i: : %s\n", minor,
256 snd_oss_device_type_name(mptr->type));
258 mutex_unlock(&sound_oss_mutex);
262 int __init snd_minor_info_oss_init(void)
264 struct snd_info_entry *entry;
266 entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
268 entry->c.text.read = snd_minor_info_oss_read;
269 if (snd_info_register(entry) < 0) {
270 snd_info_free_entry(entry);
274 snd_minor_info_oss_entry = entry;
278 int __exit snd_minor_info_oss_done(void)
280 snd_info_free_entry(snd_minor_info_oss_entry);
283 #endif /* CONFIG_PROC_FS */
285 #endif /* CONFIG_SND_OSSEMUL */