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