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