Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / 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
38 #define SNDRV_OS_MINORS         256
39
40 static struct list_head snd_oss_minors_hash[SNDRV_CARDS];
41
42 static DECLARE_MUTEX(sound_oss_mutex);
43
44 static snd_minor_t *snd_oss_minor_search(int minor)
45 {
46         struct list_head *list;
47         snd_minor_t *mptr;
48
49         list_for_each(list, &snd_oss_minors_hash[SNDRV_MINOR_OSS_CARD(minor)]) {
50                 mptr = list_entry(list, snd_minor_t, list);
51                 if (mptr->number == minor)
52                         return mptr;
53         }
54         return NULL;
55 }
56
57 static int snd_oss_kernel_minor(int type, snd_card_t * card, int dev)
58 {
59         int minor;
60
61         switch (type) {
62         case SNDRV_OSS_DEVICE_TYPE_MIXER:
63                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
64                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
65                 break;
66         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
67                 minor = SNDRV_MINOR_OSS_SEQUENCER;
68                 break;
69         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
70                 minor = SNDRV_MINOR_OSS_MUSIC;
71                 break;
72         case SNDRV_OSS_DEVICE_TYPE_PCM:
73                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
74                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
75                 break;
76         case SNDRV_OSS_DEVICE_TYPE_MIDI:
77                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
78                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
79                 break;
80         case SNDRV_OSS_DEVICE_TYPE_DMFM:
81                 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
82                 break;
83         case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
84                 minor = SNDRV_MINOR_OSS_SNDSTAT;
85                 break;
86         default:
87                 return -EINVAL;
88         }
89         snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
90         return minor;
91 }
92
93 int snd_register_oss_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name)
94 {
95         int minor = snd_oss_kernel_minor(type, card, dev);
96         int minor_unit;
97         snd_minor_t *preg;
98         int cidx = SNDRV_MINOR_OSS_CARD(minor);
99         int track2 = -1;
100         int register1 = -1, register2 = -1;
101         struct device *carddev = NULL;
102
103         if (minor < 0)
104                 return minor;
105         preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t), GFP_KERNEL);
106         if (preg == NULL)
107                 return -ENOMEM;
108         *preg = *reg;
109         preg->number = minor;
110         preg->device = dev;
111         down(&sound_oss_mutex);
112         list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]);
113         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
114         switch (minor_unit) {
115         case SNDRV_MINOR_OSS_PCM:
116                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
117                 break;
118         case SNDRV_MINOR_OSS_MIDI:
119                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
120                 break;
121         case SNDRV_MINOR_OSS_MIDI1:
122                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
123                 break;
124         }
125         if (card)
126                 carddev = card->dev;
127         register1 = register_sound_special_device(reg->f_ops, minor, carddev);
128         if (register1 != minor)
129                 goto __end;
130         if (track2 >= 0) {
131                 register2 = register_sound_special_device(reg->f_ops, track2, carddev);
132                 if (register2 != track2)
133                         goto __end;
134         }
135         up(&sound_oss_mutex);
136         return 0;
137
138       __end:
139         if (register2 >= 0)
140                 unregister_sound_special(register2);
141         if (register1 >= 0)
142                 unregister_sound_special(register1);
143         list_del(&preg->list);
144         up(&sound_oss_mutex);
145         kfree(preg);
146         return -EBUSY;
147 }
148
149 int snd_unregister_oss_device(int type, snd_card_t * card, int dev)
150 {
151         int minor = snd_oss_kernel_minor(type, card, dev);
152         int cidx = SNDRV_MINOR_OSS_CARD(minor);
153         int track2 = -1;
154         snd_minor_t *mptr;
155
156         if (minor < 0)
157                 return minor;
158         down(&sound_oss_mutex);
159         mptr = snd_oss_minor_search(minor);
160         if (mptr == NULL) {
161                 up(&sound_oss_mutex);
162                 return -ENOENT;
163         }
164         unregister_sound_special(minor);
165         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
166         case SNDRV_MINOR_OSS_PCM:
167                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
168                 break;
169         case SNDRV_MINOR_OSS_MIDI:
170                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
171                 break;
172         case SNDRV_MINOR_OSS_MIDI1:
173                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
174                 break;
175         }
176         if (track2 >= 0)
177                 unregister_sound_special(track2);
178         list_del(&mptr->list);
179         up(&sound_oss_mutex);
180         kfree(mptr);
181         return 0;
182 }
183
184 /*
185  *  INFO PART
186  */
187
188 #ifdef CONFIG_PROC_FS
189
190 static snd_info_entry_t *snd_minor_info_oss_entry = NULL;
191
192 static void snd_minor_info_oss_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
193 {
194         int card, dev;
195         struct list_head *list;
196         snd_minor_t *mptr;
197
198         down(&sound_oss_mutex);
199         for (card = 0; card < SNDRV_CARDS; card++) {
200                 list_for_each(list, &snd_oss_minors_hash[card]) {
201                         mptr = list_entry(list, snd_minor_t, list);
202                         dev = SNDRV_MINOR_OSS_DEVICE(mptr->number);
203                         if (dev != SNDRV_MINOR_OSS_SNDSTAT &&
204                             dev != SNDRV_MINOR_OSS_SEQUENCER &&
205                             dev != SNDRV_MINOR_OSS_MUSIC)
206                                 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment);
207                         else
208                                 snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, mptr->comment);
209                 }
210         }
211         up(&sound_oss_mutex);
212 }
213
214 #endif /* CONFIG_PROC_FS */
215
216 int __init snd_minor_info_oss_init(void)
217 {
218 #ifdef CONFIG_PROC_FS
219         snd_info_entry_t *entry;
220
221         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
222         if (entry) {
223                 entry->c.text.read_size = PAGE_SIZE;
224                 entry->c.text.read = snd_minor_info_oss_read;
225                 if (snd_info_register(entry) < 0) {
226                         snd_info_free_entry(entry);
227                         entry = NULL;
228                 }
229         }
230         snd_minor_info_oss_entry = entry;
231 #endif
232         return 0;
233 }
234
235 int __exit snd_minor_info_oss_done(void)
236 {
237 #ifdef CONFIG_PROC_FS
238         if (snd_minor_info_oss_entry)
239                 snd_info_unregister(snd_minor_info_oss_entry);
240 #endif
241         return 0;
242 }
243
244 int __init snd_oss_init_module(void)
245 {
246         int card;
247         
248         for (card = 0; card < SNDRV_CARDS; card++)
249                 INIT_LIST_HEAD(&snd_oss_minors_hash[card]);
250         return 0;
251 }
252
253 #endif /* CONFIG_SND_OSSEMUL */