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 */
275
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