sound: Add export.h for THIS_MODULE/EXPORT_SYMBOL where needed
[linux-2.6.git] / 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/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>
37
38 #define SNDRV_OSS_MINORS 128
39
40 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
41 static DEFINE_MUTEX(sound_oss_mutex);
42
43 void *snd_lookup_oss_minor_data(unsigned int minor, int type)
44 {
45         struct snd_minor *mreg;
46         void *private_data;
47
48         if (minor >= ARRAY_SIZE(snd_oss_minors))
49                 return NULL;
50         mutex_lock(&sound_oss_mutex);
51         mreg = snd_oss_minors[minor];
52         if (mreg && mreg->type == type)
53                 private_data = mreg->private_data;
54         else
55                 private_data = NULL;
56         mutex_unlock(&sound_oss_mutex);
57         return private_data;
58 }
59
60 EXPORT_SYMBOL(snd_lookup_oss_minor_data);
61
62 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
63 {
64         int minor;
65
66         switch (type) {
67         case SNDRV_OSS_DEVICE_TYPE_MIXER:
68                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
69                         return -EINVAL;
70                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
71                 break;
72         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
73                 minor = SNDRV_MINOR_OSS_SEQUENCER;
74                 break;
75         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
76                 minor = SNDRV_MINOR_OSS_MUSIC;
77                 break;
78         case SNDRV_OSS_DEVICE_TYPE_PCM:
79                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
80                         return -EINVAL;
81                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
82                 break;
83         case SNDRV_OSS_DEVICE_TYPE_MIDI:
84                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
85                         return -EINVAL;
86                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
87                 break;
88         case SNDRV_OSS_DEVICE_TYPE_DMFM:
89                 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
90                 break;
91         case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
92                 minor = SNDRV_MINOR_OSS_SNDSTAT;
93                 break;
94         default:
95                 return -EINVAL;
96         }
97         if (minor < 0 || minor >= SNDRV_OSS_MINORS)
98                 return -EINVAL;
99         return minor;
100 }
101
102 int snd_register_oss_device(int type, struct snd_card *card, int dev,
103                             const struct file_operations *f_ops, void *private_data,
104                             const char *name)
105 {
106         int minor = snd_oss_kernel_minor(type, card, dev);
107         int minor_unit;
108         struct snd_minor *preg;
109         int cidx = SNDRV_MINOR_OSS_CARD(minor);
110         int track2 = -1;
111         int register1 = -1, register2 = -1;
112         struct device *carddev = snd_card_get_device_link(card);
113
114         if (card && card->number >= 8)
115                 return 0; /* ignore silently */
116         if (minor < 0)
117                 return minor;
118         preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
119         if (preg == NULL)
120                 return -ENOMEM;
121         preg->type = type;
122         preg->card = card ? card->number : -1;
123         preg->device = dev;
124         preg->f_ops = f_ops;
125         preg->private_data = private_data;
126         mutex_lock(&sound_oss_mutex);
127         snd_oss_minors[minor] = preg;
128         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
129         switch (minor_unit) {
130         case SNDRV_MINOR_OSS_PCM:
131                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
132                 break;
133         case SNDRV_MINOR_OSS_MIDI:
134                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
135                 break;
136         case SNDRV_MINOR_OSS_MIDI1:
137                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
138                 break;
139         }
140         register1 = register_sound_special_device(f_ops, minor, carddev);
141         if (register1 != minor)
142                 goto __end;
143         if (track2 >= 0) {
144                 register2 = register_sound_special_device(f_ops, track2,
145                                                           carddev);
146                 if (register2 != track2)
147                         goto __end;
148                 snd_oss_minors[track2] = preg;
149         }
150         mutex_unlock(&sound_oss_mutex);
151         return 0;
152
153       __end:
154         if (register2 >= 0)
155                 unregister_sound_special(register2);
156         if (register1 >= 0)
157                 unregister_sound_special(register1);
158         snd_oss_minors[minor] = NULL;
159         mutex_unlock(&sound_oss_mutex);
160         kfree(preg);
161         return -EBUSY;
162 }
163
164 EXPORT_SYMBOL(snd_register_oss_device);
165
166 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
167 {
168         int minor = snd_oss_kernel_minor(type, card, dev);
169         int cidx = SNDRV_MINOR_OSS_CARD(minor);
170         int track2 = -1;
171         struct snd_minor *mptr;
172
173         if (card && card->number >= 8)
174                 return 0;
175         if (minor < 0)
176                 return minor;
177         mutex_lock(&sound_oss_mutex);
178         mptr = snd_oss_minors[minor];
179         if (mptr == NULL) {
180                 mutex_unlock(&sound_oss_mutex);
181                 return -ENOENT;
182         }
183         unregister_sound_special(minor);
184         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
185         case SNDRV_MINOR_OSS_PCM:
186                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
187                 break;
188         case SNDRV_MINOR_OSS_MIDI:
189                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
190                 break;
191         case SNDRV_MINOR_OSS_MIDI1:
192                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
193                 break;
194         }
195         if (track2 >= 0) {
196                 unregister_sound_special(track2);
197                 snd_oss_minors[track2] = NULL;
198         }
199         snd_oss_minors[minor] = NULL;
200         mutex_unlock(&sound_oss_mutex);
201         kfree(mptr);
202         return 0;
203 }
204
205 EXPORT_SYMBOL(snd_unregister_oss_device);
206
207 /*
208  *  INFO PART
209  */
210
211 #ifdef CONFIG_PROC_FS
212
213 static struct snd_info_entry *snd_minor_info_oss_entry;
214
215 static const char *snd_oss_device_type_name(int type)
216 {
217         switch (type) {
218         case SNDRV_OSS_DEVICE_TYPE_MIXER:
219                 return "mixer";
220         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
221         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
222                 return "sequencer";
223         case SNDRV_OSS_DEVICE_TYPE_PCM:
224                 return "digital audio";
225         case SNDRV_OSS_DEVICE_TYPE_MIDI:
226                 return "raw midi";
227         case SNDRV_OSS_DEVICE_TYPE_DMFM:
228                 return "hardware dependent";
229         default:
230                 return "?";
231         }
232 }
233
234 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
235                                     struct snd_info_buffer *buffer)
236 {
237         int minor;
238         struct snd_minor *mptr;
239
240         mutex_lock(&sound_oss_mutex);
241         for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
242                 if (!(mptr = snd_oss_minors[minor]))
243                         continue;
244                 if (mptr->card >= 0)
245                         snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
246                                     mptr->card, mptr->device,
247                                     snd_oss_device_type_name(mptr->type));
248                 else
249                         snd_iprintf(buffer, "%3i:       : %s\n", minor,
250                                     snd_oss_device_type_name(mptr->type));
251         }
252         mutex_unlock(&sound_oss_mutex);
253 }
254
255
256 int __init snd_minor_info_oss_init(void)
257 {
258         struct snd_info_entry *entry;
259
260         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
261         if (entry) {
262                 entry->c.text.read = snd_minor_info_oss_read;
263                 if (snd_info_register(entry) < 0) {
264                         snd_info_free_entry(entry);
265                         entry = NULL;
266                 }
267         }
268         snd_minor_info_oss_entry = entry;
269         return 0;
270 }
271
272 int __exit snd_minor_info_oss_done(void)
273 {
274         snd_info_free_entry(snd_minor_info_oss_entry);
275         return 0;
276 }
277 #endif /* CONFIG_PROC_FS */
278
279 #endif /* CONFIG_SND_OSSEMUL */