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 #include <linux/init.h>
23 #include <linux/export.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <sound/core.h>
27 #include <sound/minors.h>
28 #include <sound/info.h>
29 #include <linux/sound.h>
30 #include <linux/mutex.h>
32 #define SNDRV_OSS_MINORS 256
34 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
35 static DEFINE_MUTEX(sound_oss_mutex);
37 /* NOTE: This function increments the refcount of the associated card like
38 * snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
40 void *snd_lookup_oss_minor_data(unsigned int minor, int type)
42 struct snd_minor *mreg;
45 if (minor >= ARRAY_SIZE(snd_oss_minors))
47 mutex_lock(&sound_oss_mutex);
48 mreg = snd_oss_minors[minor];
49 if (mreg && mreg->type == type) {
50 private_data = mreg->private_data;
51 if (private_data && mreg->card_ptr)
52 get_device(&mreg->card_ptr->card_dev);
55 mutex_unlock(&sound_oss_mutex);
58 EXPORT_SYMBOL(snd_lookup_oss_minor_data);
60 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
65 case SNDRV_OSS_DEVICE_TYPE_MIXER:
66 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
68 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
70 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
71 minor = SNDRV_MINOR_OSS_SEQUENCER;
73 case SNDRV_OSS_DEVICE_TYPE_MUSIC:
74 minor = SNDRV_MINOR_OSS_MUSIC;
76 case SNDRV_OSS_DEVICE_TYPE_PCM:
77 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
79 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
81 case SNDRV_OSS_DEVICE_TYPE_MIDI:
82 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
84 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
86 case SNDRV_OSS_DEVICE_TYPE_DMFM:
87 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
89 case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
90 minor = SNDRV_MINOR_OSS_SNDSTAT;
95 if (minor < 0 || minor >= SNDRV_OSS_MINORS)
100 int snd_register_oss_device(int type, struct snd_card *card, int dev,
101 const struct file_operations *f_ops, void *private_data)
103 int minor = snd_oss_kernel_minor(type, card, dev);
105 struct snd_minor *preg;
106 int cidx = SNDRV_MINOR_OSS_CARD(minor);
108 int register1 = -1, register2 = -1;
109 struct device *carddev = snd_card_get_device_link(card);
111 if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
112 return 0; /* ignore silently */
115 preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
119 preg->card = card ? card->number : -1;
122 preg->private_data = private_data;
123 preg->card_ptr = card;
124 mutex_lock(&sound_oss_mutex);
125 snd_oss_minors[minor] = preg;
126 minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
127 switch (minor_unit) {
128 case SNDRV_MINOR_OSS_PCM:
129 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
131 case SNDRV_MINOR_OSS_MIDI:
132 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
134 case SNDRV_MINOR_OSS_MIDI1:
135 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
138 register1 = register_sound_special_device(f_ops, minor, carddev);
139 if (register1 != minor)
142 register2 = register_sound_special_device(f_ops, track2,
144 if (register2 != track2)
146 snd_oss_minors[track2] = preg;
148 mutex_unlock(&sound_oss_mutex);
153 unregister_sound_special(register2);
155 unregister_sound_special(register1);
156 snd_oss_minors[minor] = NULL;
157 mutex_unlock(&sound_oss_mutex);
161 EXPORT_SYMBOL(snd_register_oss_device);
163 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
165 int minor = snd_oss_kernel_minor(type, card, dev);
166 int cidx = SNDRV_MINOR_OSS_CARD(minor);
168 struct snd_minor *mptr;
170 if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
174 mutex_lock(&sound_oss_mutex);
175 mptr = snd_oss_minors[minor];
177 mutex_unlock(&sound_oss_mutex);
180 unregister_sound_special(minor);
181 switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
182 case SNDRV_MINOR_OSS_PCM:
183 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
185 case SNDRV_MINOR_OSS_MIDI:
186 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
188 case SNDRV_MINOR_OSS_MIDI1:
189 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
193 unregister_sound_special(track2);
194 snd_oss_minors[track2] = NULL;
196 snd_oss_minors[minor] = NULL;
197 mutex_unlock(&sound_oss_mutex);
201 EXPORT_SYMBOL(snd_unregister_oss_device);
207 #ifdef CONFIG_SND_PROC_FS
208 static const char *snd_oss_device_type_name(int type)
211 case SNDRV_OSS_DEVICE_TYPE_MIXER:
213 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
214 case SNDRV_OSS_DEVICE_TYPE_MUSIC:
216 case SNDRV_OSS_DEVICE_TYPE_PCM:
217 return "digital audio";
218 case SNDRV_OSS_DEVICE_TYPE_MIDI:
220 case SNDRV_OSS_DEVICE_TYPE_DMFM:
221 return "hardware dependent";
227 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
228 struct snd_info_buffer *buffer)
231 struct snd_minor *mptr;
233 mutex_lock(&sound_oss_mutex);
234 for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
235 if (!(mptr = snd_oss_minors[minor]))
238 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
239 mptr->card, mptr->device,
240 snd_oss_device_type_name(mptr->type));
242 snd_iprintf(buffer, "%3i: : %s\n", minor,
243 snd_oss_device_type_name(mptr->type));
245 mutex_unlock(&sound_oss_mutex);
249 int __init snd_minor_info_oss_init(void)
251 struct snd_info_entry *entry;
253 entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
256 entry->c.text.read = snd_minor_info_oss_read;
257 return snd_info_register(entry); /* freed in error path */
259 #endif /* CONFIG_SND_PROC_FS */