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