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