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 /* NOTE: This function increments the refcount of the associated card like
44 * snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
45 */
snd_lookup_oss_minor_data(unsigned int minor,int type)46 void *snd_lookup_oss_minor_data(unsigned int minor, int type)
47 {
48 struct snd_minor *mreg;
49 void *private_data;
50
51 if (minor >= ARRAY_SIZE(snd_oss_minors))
52 return NULL;
53 mutex_lock(&sound_oss_mutex);
54 mreg = snd_oss_minors[minor];
55 if (mreg && mreg->type == type) {
56 private_data = mreg->private_data;
57 if (private_data && mreg->card_ptr)
58 atomic_inc(&mreg->card_ptr->refcount);
59 } else
60 private_data = NULL;
61 mutex_unlock(&sound_oss_mutex);
62 return private_data;
63 }
64
65 EXPORT_SYMBOL(snd_lookup_oss_minor_data);
66
snd_oss_kernel_minor(int type,struct snd_card * card,int dev)67 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
68 {
69 int minor;
70
71 switch (type) {
72 case SNDRV_OSS_DEVICE_TYPE_MIXER:
73 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
74 return -EINVAL;
75 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
76 break;
77 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
78 minor = SNDRV_MINOR_OSS_SEQUENCER;
79 break;
80 case SNDRV_OSS_DEVICE_TYPE_MUSIC:
81 minor = SNDRV_MINOR_OSS_MUSIC;
82 break;
83 case SNDRV_OSS_DEVICE_TYPE_PCM:
84 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
85 return -EINVAL;
86 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
87 break;
88 case SNDRV_OSS_DEVICE_TYPE_MIDI:
89 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
90 return -EINVAL;
91 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
92 break;
93 case SNDRV_OSS_DEVICE_TYPE_DMFM:
94 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
95 break;
96 case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
97 minor = SNDRV_MINOR_OSS_SNDSTAT;
98 break;
99 default:
100 return -EINVAL;
101 }
102 if (minor < 0 || minor >= SNDRV_OSS_MINORS)
103 return -EINVAL;
104 return minor;
105 }
106
snd_register_oss_device(int type,struct snd_card * card,int dev,const struct file_operations * f_ops,void * private_data,const char * name)107 int snd_register_oss_device(int type, struct snd_card *card, int dev,
108 const struct file_operations *f_ops, void *private_data,
109 const char *name)
110 {
111 int minor = snd_oss_kernel_minor(type, card, dev);
112 int minor_unit;
113 struct snd_minor *preg;
114 int cidx = SNDRV_MINOR_OSS_CARD(minor);
115 int track2 = -1;
116 int register1 = -1, register2 = -1;
117 struct device *carddev = snd_card_get_device_link(card);
118
119 if (card && card->number >= 8)
120 return 0; /* ignore silently */
121 if (minor < 0)
122 return minor;
123 preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
124 if (preg == NULL)
125 return -ENOMEM;
126 preg->type = type;
127 preg->card = card ? card->number : -1;
128 preg->device = dev;
129 preg->f_ops = f_ops;
130 preg->private_data = private_data;
131 preg->card_ptr = card;
132 mutex_lock(&sound_oss_mutex);
133 snd_oss_minors[minor] = preg;
134 minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
135 switch (minor_unit) {
136 case SNDRV_MINOR_OSS_PCM:
137 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
138 break;
139 case SNDRV_MINOR_OSS_MIDI:
140 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
141 break;
142 case SNDRV_MINOR_OSS_MIDI1:
143 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
144 break;
145 }
146 register1 = register_sound_special_device(f_ops, minor, carddev);
147 if (register1 != minor)
148 goto __end;
149 if (track2 >= 0) {
150 register2 = register_sound_special_device(f_ops, track2,
151 carddev);
152 if (register2 != track2)
153 goto __end;
154 snd_oss_minors[track2] = preg;
155 }
156 mutex_unlock(&sound_oss_mutex);
157 return 0;
158
159 __end:
160 if (register2 >= 0)
161 unregister_sound_special(register2);
162 if (register1 >= 0)
163 unregister_sound_special(register1);
164 snd_oss_minors[minor] = NULL;
165 mutex_unlock(&sound_oss_mutex);
166 kfree(preg);
167 return -EBUSY;
168 }
169
170 EXPORT_SYMBOL(snd_register_oss_device);
171
snd_unregister_oss_device(int type,struct snd_card * card,int dev)172 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
173 {
174 int minor = snd_oss_kernel_minor(type, card, dev);
175 int cidx = SNDRV_MINOR_OSS_CARD(minor);
176 int track2 = -1;
177 struct snd_minor *mptr;
178
179 if (card && card->number >= 8)
180 return 0;
181 if (minor < 0)
182 return minor;
183 mutex_lock(&sound_oss_mutex);
184 mptr = snd_oss_minors[minor];
185 if (mptr == NULL) {
186 mutex_unlock(&sound_oss_mutex);
187 return -ENOENT;
188 }
189 unregister_sound_special(minor);
190 switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
191 case SNDRV_MINOR_OSS_PCM:
192 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
193 break;
194 case SNDRV_MINOR_OSS_MIDI:
195 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
196 break;
197 case SNDRV_MINOR_OSS_MIDI1:
198 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
199 break;
200 }
201 if (track2 >= 0) {
202 unregister_sound_special(track2);
203 snd_oss_minors[track2] = NULL;
204 }
205 snd_oss_minors[minor] = NULL;
206 mutex_unlock(&sound_oss_mutex);
207 kfree(mptr);
208 return 0;
209 }
210
211 EXPORT_SYMBOL(snd_unregister_oss_device);
212
213 /*
214 * INFO PART
215 */
216
217 #ifdef CONFIG_PROC_FS
218
219 static struct snd_info_entry *snd_minor_info_oss_entry;
220
snd_oss_device_type_name(int type)221 static const char *snd_oss_device_type_name(int type)
222 {
223 switch (type) {
224 case SNDRV_OSS_DEVICE_TYPE_MIXER:
225 return "mixer";
226 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
227 case SNDRV_OSS_DEVICE_TYPE_MUSIC:
228 return "sequencer";
229 case SNDRV_OSS_DEVICE_TYPE_PCM:
230 return "digital audio";
231 case SNDRV_OSS_DEVICE_TYPE_MIDI:
232 return "raw midi";
233 case SNDRV_OSS_DEVICE_TYPE_DMFM:
234 return "hardware dependent";
235 default:
236 return "?";
237 }
238 }
239
snd_minor_info_oss_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)240 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
241 struct snd_info_buffer *buffer)
242 {
243 int minor;
244 struct snd_minor *mptr;
245
246 mutex_lock(&sound_oss_mutex);
247 for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
248 if (!(mptr = snd_oss_minors[minor]))
249 continue;
250 if (mptr->card >= 0)
251 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
252 mptr->card, mptr->device,
253 snd_oss_device_type_name(mptr->type));
254 else
255 snd_iprintf(buffer, "%3i: : %s\n", minor,
256 snd_oss_device_type_name(mptr->type));
257 }
258 mutex_unlock(&sound_oss_mutex);
259 }
260
261
snd_minor_info_oss_init(void)262 int __init snd_minor_info_oss_init(void)
263 {
264 struct snd_info_entry *entry;
265
266 entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
267 if (entry) {
268 entry->c.text.read = snd_minor_info_oss_read;
269 if (snd_info_register(entry) < 0) {
270 snd_info_free_entry(entry);
271 entry = NULL;
272 }
273 }
274 snd_minor_info_oss_entry = entry;
275 return 0;
276 }
277
snd_minor_info_oss_done(void)278 int __exit snd_minor_info_oss_done(void)
279 {
280 snd_info_free_entry(snd_minor_info_oss_entry);
281 return 0;
282 }
283 #endif /* CONFIG_PROC_FS */
284
285 #endif /* CONFIG_SND_OSSEMUL */
286