Merge git://git.infradead.org/mtd-2.6
[linux-2.6] / sound / core / sound_oss.c
1 /*
2  *  Advanced Linux Sound Architecture
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.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 #ifdef CONFIG_SND_OSSEMUL
23
24 #if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE))
25 #error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
26 #endif
27
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <linux/time.h>
31 #include <sound/core.h>
32 #include <sound/minors.h>
33 #include <sound/info.h>
34 #include <linux/sound.h>
35 #include <linux/mutex.h>
36
37 #define SNDRV_OSS_MINORS 128
38
39 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
40 static DEFINE_MUTEX(sound_oss_mutex);
41
42 void *snd_lookup_oss_minor_data(unsigned int minor, int type)
43 {
44         struct snd_minor *mreg;
45         void *private_data;
46
47         if (minor >= ARRAY_SIZE(snd_oss_minors))
48                 return NULL;
49         mutex_lock(&sound_oss_mutex);
50         mreg = snd_oss_minors[minor];
51         if (mreg && mreg->type == type)
52                 private_data = mreg->private_data;
53         else
54                 private_data = NULL;
55         mutex_unlock(&sound_oss_mutex);
56         return private_data;
57 }
58
59 EXPORT_SYMBOL(snd_lookup_oss_minor_data);
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                             const 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 = snd_card_get_device_link(card);
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         register1 = register_sound_special_device(f_ops, minor, carddev);
136         if (register1 != minor)
137                 goto __end;
138         if (track2 >= 0) {
139                 register2 = register_sound_special_device(f_ops, track2,
140                                                           carddev);
141                 if (register2 != track2)
142                         goto __end;
143                 snd_oss_minors[track2] = preg;
144         }
145         mutex_unlock(&sound_oss_mutex);
146         return 0;
147
148       __end:
149         if (register2 >= 0)
150                 unregister_sound_special(register2);
151         if (register1 >= 0)
152                 unregister_sound_special(register1);
153         snd_oss_minors[minor] = NULL;
154         mutex_unlock(&sound_oss_mutex);
155         kfree(preg);
156         return -EBUSY;
157 }
158
159 EXPORT_SYMBOL(snd_register_oss_device);
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 EXPORT_SYMBOL(snd_unregister_oss_device);
201
202 /*
203  *  INFO PART
204  */
205
206 #ifdef CONFIG_PROC_FS
207
208 static struct snd_info_entry *snd_minor_info_oss_entry;
209
210 static const char *snd_oss_device_type_name(int type)
211 {
212         switch (type) {
213         case SNDRV_OSS_DEVICE_TYPE_MIXER:
214                 return "mixer";
215         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
216         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
217                 return "sequencer";
218         case SNDRV_OSS_DEVICE_TYPE_PCM:
219                 return "digital audio";
220         case SNDRV_OSS_DEVICE_TYPE_MIDI:
221                 return "raw midi";
222         case SNDRV_OSS_DEVICE_TYPE_DMFM:
223                 return "hardware dependent";
224         default:
225                 return "?";
226         }
227 }
228
229 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
230                                     struct snd_info_buffer *buffer)
231 {
232         int minor;
233         struct snd_minor *mptr;
234
235         mutex_lock(&sound_oss_mutex);
236         for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
237                 if (!(mptr = snd_oss_minors[minor]))
238                         continue;
239                 if (mptr->card >= 0)
240                         snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
241                                     mptr->card, mptr->device,
242                                     snd_oss_device_type_name(mptr->type));
243                 else
244                         snd_iprintf(buffer, "%3i:       : %s\n", minor,
245                                     snd_oss_device_type_name(mptr->type));
246         }
247         mutex_unlock(&sound_oss_mutex);
248 }
249
250
251 int __init snd_minor_info_oss_init(void)
252 {
253         struct snd_info_entry *entry;
254
255         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
256         if (entry) {
257                 entry->c.text.read = snd_minor_info_oss_read;
258                 if (snd_info_register(entry) < 0) {
259                         snd_info_free_entry(entry);
260                         entry = NULL;
261                 }
262         }
263         snd_minor_info_oss_entry = entry;
264         return 0;
265 }
266
267 int __exit snd_minor_info_oss_done(void)
268 {
269         snd_info_free_entry(snd_minor_info_oss_entry);
270         return 0;
271 }
272 #endif /* CONFIG_PROC_FS */
273
274 #endif /* CONFIG_SND_OSSEMUL */