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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 !IS_ENABLED(CONFIG_SOUND)
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 256
39
40static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
41static 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 */
46void *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 get_device(&mreg->card_ptr->card_dev);
59 } else
60 private_data = NULL;
61 mutex_unlock(&sound_oss_mutex);
62 return private_data;
63}
64
65EXPORT_SYMBOL(snd_lookup_oss_minor_data);
66
67static 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
107int snd_register_oss_device(int type, struct snd_card *card, int dev,
108 const struct file_operations *f_ops, void *private_data)
109{
110 int minor = snd_oss_kernel_minor(type, card, dev);
111 int minor_unit;
112 struct snd_minor *preg;
113 int cidx = SNDRV_MINOR_OSS_CARD(minor);
114 int track2 = -1;
115 int register1 = -1, register2 = -1;
116 struct device *carddev = snd_card_get_device_link(card);
117
118 if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
119 return 0; /* ignore silently */
120 if (minor < 0)
121 return minor;
122 preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
123 if (preg == NULL)
124 return -ENOMEM;
125 preg->type = type;
126 preg->card = card ? card->number : -1;
127 preg->device = dev;
128 preg->f_ops = f_ops;
129 preg->private_data = private_data;
130 preg->card_ptr = card;
131 mutex_lock(&sound_oss_mutex);
132 snd_oss_minors[minor] = preg;
133 minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
134 switch (minor_unit) {
135 case SNDRV_MINOR_OSS_PCM:
136 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
137 break;
138 case SNDRV_MINOR_OSS_MIDI:
139 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
140 break;
141 case SNDRV_MINOR_OSS_MIDI1:
142 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
143 break;
144 }
145 register1 = register_sound_special_device(f_ops, minor, carddev);
146 if (register1 != minor)
147 goto __end;
148 if (track2 >= 0) {
149 register2 = register_sound_special_device(f_ops, track2,
150 carddev);
151 if (register2 != track2)
152 goto __end;
153 snd_oss_minors[track2] = preg;
154 }
155 mutex_unlock(&sound_oss_mutex);
156 return 0;
157
158 __end:
159 if (register2 >= 0)
160 unregister_sound_special(register2);
161 if (register1 >= 0)
162 unregister_sound_special(register1);
163 snd_oss_minors[minor] = NULL;
164 mutex_unlock(&sound_oss_mutex);
165 kfree(preg);
166 return -EBUSY;
167}
168
169EXPORT_SYMBOL(snd_register_oss_device);
170
171int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
172{
173 int minor = snd_oss_kernel_minor(type, card, dev);
174 int cidx = SNDRV_MINOR_OSS_CARD(minor);
175 int track2 = -1;
176 struct snd_minor *mptr;
177
178 if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
179 return 0;
180 if (minor < 0)
181 return minor;
182 mutex_lock(&sound_oss_mutex);
183 mptr = snd_oss_minors[minor];
184 if (mptr == NULL) {
185 mutex_unlock(&sound_oss_mutex);
186 return -ENOENT;
187 }
188 unregister_sound_special(minor);
189 switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
190 case SNDRV_MINOR_OSS_PCM:
191 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
192 break;
193 case SNDRV_MINOR_OSS_MIDI:
194 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
195 break;
196 case SNDRV_MINOR_OSS_MIDI1:
197 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
198 break;
199 }
200 if (track2 >= 0) {
201 unregister_sound_special(track2);
202 snd_oss_minors[track2] = NULL;
203 }
204 snd_oss_minors[minor] = NULL;
205 mutex_unlock(&sound_oss_mutex);
206 kfree(mptr);
207 return 0;
208}
209
210EXPORT_SYMBOL(snd_unregister_oss_device);
211
212/*
213 * INFO PART
214 */
215
216#ifdef CONFIG_PROC_FS
217
218static struct snd_info_entry *snd_minor_info_oss_entry;
219
220static const char *snd_oss_device_type_name(int type)
221{
222 switch (type) {
223 case SNDRV_OSS_DEVICE_TYPE_MIXER:
224 return "mixer";
225 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
226 case SNDRV_OSS_DEVICE_TYPE_MUSIC:
227 return "sequencer";
228 case SNDRV_OSS_DEVICE_TYPE_PCM:
229 return "digital audio";
230 case SNDRV_OSS_DEVICE_TYPE_MIDI:
231 return "raw midi";
232 case SNDRV_OSS_DEVICE_TYPE_DMFM:
233 return "hardware dependent";
234 default:
235 return "?";
236 }
237}
238
239static void snd_minor_info_oss_read(struct snd_info_entry *entry,
240 struct snd_info_buffer *buffer)
241{
242 int minor;
243 struct snd_minor *mptr;
244
245 mutex_lock(&sound_oss_mutex);
246 for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
247 if (!(mptr = snd_oss_minors[minor]))
248 continue;
249 if (mptr->card >= 0)
250 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
251 mptr->card, mptr->device,
252 snd_oss_device_type_name(mptr->type));
253 else
254 snd_iprintf(buffer, "%3i: : %s\n", minor,
255 snd_oss_device_type_name(mptr->type));
256 }
257 mutex_unlock(&sound_oss_mutex);
258}
259
260
261int __init snd_minor_info_oss_init(void)
262{
263 struct snd_info_entry *entry;
264
265 entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
266 if (entry) {
267 entry->c.text.read = snd_minor_info_oss_read;
268 if (snd_info_register(entry) < 0) {
269 snd_info_free_entry(entry);
270 entry = NULL;
271 }
272 }
273 snd_minor_info_oss_entry = entry;
274 return 0;
275}
276
277int __exit snd_minor_info_oss_done(void)
278{
279 snd_info_free_entry(snd_minor_info_oss_entry);
280 return 0;
281}
282#endif /* CONFIG_PROC_FS */
283
284#endif /* CONFIG_SND_OSSEMUL */
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Advanced Linux Sound Architecture
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7#include <linux/init.h>
8#include <linux/export.h>
9#include <linux/slab.h>
10#include <linux/time.h>
11#include <sound/core.h>
12#include <sound/minors.h>
13#include <sound/info.h>
14#include <linux/sound.h>
15#include <linux/mutex.h>
16
17#define SNDRV_OSS_MINORS 256
18
19static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
20static DEFINE_MUTEX(sound_oss_mutex);
21
22/* NOTE: This function increments the refcount of the associated card like
23 * snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
24 */
25void *snd_lookup_oss_minor_data(unsigned int minor, int type)
26{
27 struct snd_minor *mreg;
28 void *private_data;
29
30 if (minor >= ARRAY_SIZE(snd_oss_minors))
31 return NULL;
32 mutex_lock(&sound_oss_mutex);
33 mreg = snd_oss_minors[minor];
34 if (mreg && mreg->type == type) {
35 private_data = mreg->private_data;
36 if (private_data && mreg->card_ptr)
37 get_device(&mreg->card_ptr->card_dev);
38 } else
39 private_data = NULL;
40 mutex_unlock(&sound_oss_mutex);
41 return private_data;
42}
43EXPORT_SYMBOL(snd_lookup_oss_minor_data);
44
45static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
46{
47 int minor;
48
49 switch (type) {
50 case SNDRV_OSS_DEVICE_TYPE_MIXER:
51 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
52 return -EINVAL;
53 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
54 break;
55 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
56 minor = SNDRV_MINOR_OSS_SEQUENCER;
57 break;
58 case SNDRV_OSS_DEVICE_TYPE_MUSIC:
59 minor = SNDRV_MINOR_OSS_MUSIC;
60 break;
61 case SNDRV_OSS_DEVICE_TYPE_PCM:
62 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
63 return -EINVAL;
64 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
65 break;
66 case SNDRV_OSS_DEVICE_TYPE_MIDI:
67 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
68 return -EINVAL;
69 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
70 break;
71 case SNDRV_OSS_DEVICE_TYPE_DMFM:
72 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
73 break;
74 case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
75 minor = SNDRV_MINOR_OSS_SNDSTAT;
76 break;
77 default:
78 return -EINVAL;
79 }
80 if (minor < 0 || minor >= SNDRV_OSS_MINORS)
81 return -EINVAL;
82 return minor;
83}
84
85int snd_register_oss_device(int type, struct snd_card *card, int dev,
86 const struct file_operations *f_ops, void *private_data)
87{
88 int minor = snd_oss_kernel_minor(type, card, dev);
89 int minor_unit;
90 struct snd_minor *preg;
91 int cidx = SNDRV_MINOR_OSS_CARD(minor);
92 int track2 = -1;
93 int register1 = -1, register2 = -1;
94 struct device *carddev = snd_card_get_device_link(card);
95
96 if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
97 return 0; /* ignore silently */
98 if (minor < 0)
99 return minor;
100 preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
101 if (preg == NULL)
102 return -ENOMEM;
103 preg->type = type;
104 preg->card = card ? card->number : -1;
105 preg->device = dev;
106 preg->f_ops = f_ops;
107 preg->private_data = private_data;
108 preg->card_ptr = card;
109 mutex_lock(&sound_oss_mutex);
110 snd_oss_minors[minor] = preg;
111 minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
112 switch (minor_unit) {
113 case SNDRV_MINOR_OSS_PCM:
114 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
115 break;
116 case SNDRV_MINOR_OSS_MIDI:
117 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
118 break;
119 case SNDRV_MINOR_OSS_MIDI1:
120 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
121 break;
122 }
123 register1 = register_sound_special_device(f_ops, minor, carddev);
124 if (register1 != minor)
125 goto __end;
126 if (track2 >= 0) {
127 register2 = register_sound_special_device(f_ops, track2,
128 carddev);
129 if (register2 != track2)
130 goto __end;
131 snd_oss_minors[track2] = preg;
132 }
133 mutex_unlock(&sound_oss_mutex);
134 return 0;
135
136 __end:
137 if (register2 >= 0)
138 unregister_sound_special(register2);
139 if (register1 >= 0)
140 unregister_sound_special(register1);
141 snd_oss_minors[minor] = NULL;
142 mutex_unlock(&sound_oss_mutex);
143 kfree(preg);
144 return -EBUSY;
145}
146EXPORT_SYMBOL(snd_register_oss_device);
147
148int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
149{
150 int minor = snd_oss_kernel_minor(type, card, dev);
151 int cidx = SNDRV_MINOR_OSS_CARD(minor);
152 int track2 = -1;
153 struct snd_minor *mptr;
154
155 if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
156 return 0;
157 if (minor < 0)
158 return minor;
159 mutex_lock(&sound_oss_mutex);
160 mptr = snd_oss_minors[minor];
161 if (mptr == NULL) {
162 mutex_unlock(&sound_oss_mutex);
163 return -ENOENT;
164 }
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 snd_oss_minors[track2] = NULL;
178 snd_oss_minors[minor] = NULL;
179 mutex_unlock(&sound_oss_mutex);
180
181 /* call unregister_sound_special() outside sound_oss_mutex;
182 * otherwise may deadlock, as it can trigger the release of a card
183 */
184 unregister_sound_special(minor);
185 if (track2 >= 0)
186 unregister_sound_special(track2);
187
188 kfree(mptr);
189 return 0;
190}
191EXPORT_SYMBOL(snd_unregister_oss_device);
192
193/*
194 * INFO PART
195 */
196
197#ifdef CONFIG_SND_PROC_FS
198static const char *snd_oss_device_type_name(int type)
199{
200 switch (type) {
201 case SNDRV_OSS_DEVICE_TYPE_MIXER:
202 return "mixer";
203 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
204 case SNDRV_OSS_DEVICE_TYPE_MUSIC:
205 return "sequencer";
206 case SNDRV_OSS_DEVICE_TYPE_PCM:
207 return "digital audio";
208 case SNDRV_OSS_DEVICE_TYPE_MIDI:
209 return "raw midi";
210 case SNDRV_OSS_DEVICE_TYPE_DMFM:
211 return "hardware dependent";
212 default:
213 return "?";
214 }
215}
216
217static void snd_minor_info_oss_read(struct snd_info_entry *entry,
218 struct snd_info_buffer *buffer)
219{
220 int minor;
221 struct snd_minor *mptr;
222
223 mutex_lock(&sound_oss_mutex);
224 for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
225 mptr = snd_oss_minors[minor];
226 if (!mptr)
227 continue;
228 if (mptr->card >= 0)
229 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
230 mptr->card, mptr->device,
231 snd_oss_device_type_name(mptr->type));
232 else
233 snd_iprintf(buffer, "%3i: : %s\n", minor,
234 snd_oss_device_type_name(mptr->type));
235 }
236 mutex_unlock(&sound_oss_mutex);
237}
238
239
240int __init snd_minor_info_oss_init(void)
241{
242 struct snd_info_entry *entry;
243
244 entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
245 if (!entry)
246 return -ENOMEM;
247 entry->c.text.read = snd_minor_info_oss_read;
248 return snd_info_register(entry); /* freed in error path */
249}
250#endif /* CONFIG_SND_PROC_FS */