[ALSA] semaphore -> mutex (core part)
[linux-2.6.git] / sound / core / sound_oss.c
1 /*
2  *  Advanced Linux Sound Architecture
3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
4  *
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 #include <sound/driver.h>
23
24 #ifdef CONFIG_SND_OSSEMUL
25
26 #if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE))
27 #error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
28 #endif
29
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/time.h>
33 #include <sound/core.h>
34 #include <sound/minors.h>
35 #include <sound/info.h>
36 #include <linux/sound.h>
37 #include <linux/mutex.h>
38
39 #define SNDRV_OSS_MINORS 128
40
41 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
42 static DEFINE_MUTEX(sound_oss_mutex);
43
44 void *snd_lookup_oss_minor_data(unsigned int minor, int type)
45 {
46         struct snd_minor *mreg;
47         void *private_data;
48
49         if (minor > ARRAY_SIZE(snd_oss_minors))
50                 return NULL;
51         mutex_lock(&sound_oss_mutex);
52         mreg = snd_oss_minors[minor];
53         if (mreg && mreg->type == type)
54                 private_data = mreg->private_data;
55         else
56                 private_data = NULL;
57         mutex_unlock(&sound_oss_mutex);
58         return private_data;
59 }
60
61 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
62 {
63         int minor;
64
65         switch (type) {
66         case SNDRV_OSS_DEVICE_TYPE_MIXER:
67                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
68                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
69                 break;
70         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
71                 minor = SNDRV_MINOR_OSS_SEQUENCER;
72                 break;
73         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
74                 minor = SNDRV_MINOR_OSS_MUSIC;
75                 break;
76         case SNDRV_OSS_DEVICE_TYPE_PCM:
77                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
78                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
79                 break;
80         case SNDRV_OSS_DEVICE_TYPE_MIDI:
81                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
82                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
83                 break;
84         case SNDRV_OSS_DEVICE_TYPE_DMFM:
85                 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
86                 break;
87         case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
88                 minor = SNDRV_MINOR_OSS_SNDSTAT;
89                 break;
90         default:
91                 return -EINVAL;
92         }
93         snd_assert(minor >= 0 && minor < SNDRV_OSS_MINORS, return -EINVAL);
94         return minor;
95 }
96
97 int snd_register_oss_device(int type, struct snd_card *card, int dev,
98                             struct file_operations *f_ops, void *private_data,
99                             const char *name)
100 {
101         int minor = snd_oss_kernel_minor(type, card, dev);
102         int minor_unit;
103         struct snd_minor *preg;
104         int cidx = SNDRV_MINOR_OSS_CARD(minor);
105         int track2 = -1;
106         int register1 = -1, register2 = -1;
107         struct device *carddev = NULL;
108
109         if (card && card->number >= 8)
110                 return 0; /* ignore silently */
111         if (minor < 0)
112                 return minor;
113         preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
114         if (preg == NULL)
115                 return -ENOMEM;
116         preg->type = type;
117         preg->card = card ? card->number : -1;
118         preg->device = dev;
119         preg->f_ops = f_ops;
120         preg->private_data = private_data;
121         mutex_lock(&sound_oss_mutex);
122         snd_oss_minors[minor] = preg;
123         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
124         switch (minor_unit) {
125         case SNDRV_MINOR_OSS_PCM:
126                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
127                 break;
128         case SNDRV_MINOR_OSS_MIDI:
129                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
130                 break;
131         case SNDRV_MINOR_OSS_MIDI1:
132                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
133                 break;
134         }
135         if (card)
136                 carddev = card->dev;
137         register1 = register_sound_special_device(f_ops, minor, carddev);
138         if (register1 != minor)
139                 goto __end;
140         if (track2 >= 0) {
141                 register2 = register_sound_special_device(f_ops, track2,
142                                                           carddev);
143                 if (register2 != track2)
144                         goto __end;
145                 snd_oss_minors[track2] = preg;
146         }
147         mutex_unlock(&sound_oss_mutex);
148         return 0;
149
150       __end:
151         if (register2 >= 0)
152                 unregister_sound_special(register2);
153         if (register1 >= 0)
154                 unregister_sound_special(register1);
155         snd_oss_minors[minor] = NULL;
156         mutex_unlock(&sound_oss_mutex);
157         kfree(preg);
158         return -EBUSY;
159 }
160
161 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
162 {
163         int minor = snd_oss_kernel_minor(type, card, dev);
164         int cidx = SNDRV_MINOR_OSS_CARD(minor);
165         int track2 = -1;
166         struct snd_minor *mptr;
167
168         if (card && card->number >= 8)
169                 return 0;
170         if (minor < 0)
171                 return minor;
172         mutex_lock(&sound_oss_mutex);
173         mptr = snd_oss_minors[minor];
174         if (mptr == NULL) {
175                 mutex_unlock(&sound_oss_mutex);
176                 return -ENOENT;
177         }
178         unregister_sound_special(minor);
179         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
180         case SNDRV_MINOR_OSS_PCM:
181                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
182                 break;
183         case SNDRV_MINOR_OSS_MIDI:
184                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
185                 break;
186         case SNDRV_MINOR_OSS_MIDI1:
187                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
188                 break;
189         }
190         if (track2 >= 0) {
191                 unregister_sound_special(track2);
192                 snd_oss_minors[track2] = NULL;
193         }
194         snd_oss_minors[minor] = NULL;
195         mutex_unlock(&sound_oss_mutex);
196         kfree(mptr);
197         return 0;
198 }
199
200 /*
201  *  INFO PART
202  */
203
204 #ifdef CONFIG_PROC_FS
205
206 static struct snd_info_entry *snd_minor_info_oss_entry = NULL;
207
208 static const char *snd_oss_device_type_name(int type)
209 {
210         switch (type) {
211         case SNDRV_OSS_DEVICE_TYPE_MIXER:
212                 return "mixer";
213         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
214         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
215                 return "sequencer";
216         case SNDRV_OSS_DEVICE_TYPE_PCM:
217                 return "digital audio";
218         case SNDRV_OSS_DEVICE_TYPE_MIDI:
219                 return "raw midi";
220         case SNDRV_OSS_DEVICE_TYPE_DMFM:
221                 return "hardware dependent";
222         default:
223                 return "?";
224         }
225 }
226
227 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
228                                     struct snd_info_buffer *buffer)
229 {
230         int minor;
231         struct snd_minor *mptr;
232
233         mutex_lock(&sound_oss_mutex);
234         for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
235                 if (!(mptr = snd_oss_minors[minor]))
236                         continue;
237                 if (mptr->card >= 0)
238                         snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
239                                     mptr->card, mptr->device,
240                                     snd_oss_device_type_name(mptr->type));
241                 else
242                         snd_iprintf(buffer, "%3i:       : %s\n", minor,
243                                     snd_oss_device_type_name(mptr->type));
244         }
245         mutex_unlock(&sound_oss_mutex);
246 }
247
248
249 int __init snd_minor_info_oss_init(void)
250 {
251         struct snd_info_entry *entry;
252
253         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
254         if (entry) {
255                 entry->c.text.read_size = PAGE_SIZE;
256                 entry->c.text.read = snd_minor_info_oss_read;
257                 if (snd_info_register(entry) < 0) {
258                         snd_info_free_entry(entry);
259                         entry = NULL;
260                 }
261         }
262         snd_minor_info_oss_entry = entry;
263         return 0;
264 }
265
266 int __exit snd_minor_info_oss_done(void)
267 {
268         if (snd_minor_info_oss_entry)
269                 snd_info_unregister(snd_minor_info_oss_entry);
270         return 0;
271 }
272 #endif /* CONFIG_PROC_FS */
273
274 #endif /* CONFIG_SND_OSSEMUL */