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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Advanced Linux Sound Architecture
3 * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
23
24#ifdef CONFIG_SND_OSSEMUL
25
26#if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE))
27#error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
28#endif
29
30#include <linux/init.h>
31#include <linux/slab.h>
32#include <linux/time.h>
33#include <sound/core.h>
34#include <sound/minors.h>
35#include <sound/info.h>
36#include <linux/sound.h>
37
38#define SNDRV_OS_MINORS 256
39
40static struct list_head snd_oss_minors_hash[SNDRV_CARDS];
41
42static DECLARE_MUTEX(sound_oss_mutex);
43
44static snd_minor_t *snd_oss_minor_search(int minor)
45{
46 struct list_head *list;
47 snd_minor_t *mptr;
48
49 list_for_each(list, &snd_oss_minors_hash[SNDRV_MINOR_OSS_CARD(minor)]) {
50 mptr = list_entry(list, snd_minor_t, list);
51 if (mptr->number == minor)
52 return mptr;
53 }
54 return NULL;
55}
56
57static int snd_oss_kernel_minor(int type, snd_card_t * card, int dev)
58{
59 int minor;
60
61 switch (type) {
62 case SNDRV_OSS_DEVICE_TYPE_MIXER:
63 snd_assert(card != NULL && dev <= 1, return -EINVAL);
64 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
65 break;
66 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
67 minor = SNDRV_MINOR_OSS_SEQUENCER;
68 break;
69 case SNDRV_OSS_DEVICE_TYPE_MUSIC:
70 minor = SNDRV_MINOR_OSS_MUSIC;
71 break;
72 case SNDRV_OSS_DEVICE_TYPE_PCM:
73 snd_assert(card != NULL && dev <= 1, return -EINVAL);
74 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
75 break;
76 case SNDRV_OSS_DEVICE_TYPE_MIDI:
77 snd_assert(card != NULL && dev <= 1, return -EINVAL);
78 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
79 break;
80 case SNDRV_OSS_DEVICE_TYPE_DMFM:
81 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
82 break;
83 case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
84 minor = SNDRV_MINOR_OSS_SNDSTAT;
85 break;
86 default:
87 return -EINVAL;
88 }
89 snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
90 return minor;
91}
92
93int snd_register_oss_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name)
94{
95 int minor = snd_oss_kernel_minor(type, card, dev);
96 int minor_unit;
97 snd_minor_t *preg;
98 int cidx = SNDRV_MINOR_OSS_CARD(minor);
99 int track2 = -1;
100 int register1 = -1, register2 = -1;
Takashi Iwaid5681212005-08-30 08:58:37 +0200101 struct device *carddev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103 if (minor < 0)
104 return minor;
105 preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t), GFP_KERNEL);
106 if (preg == NULL)
107 return -ENOMEM;
108 *preg = *reg;
109 preg->number = minor;
110 preg->device = dev;
111 down(&sound_oss_mutex);
112 list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]);
113 minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
114 switch (minor_unit) {
115 case SNDRV_MINOR_OSS_PCM:
116 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
117 break;
118 case SNDRV_MINOR_OSS_MIDI:
119 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
120 break;
121 case SNDRV_MINOR_OSS_MIDI1:
122 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
123 break;
124 }
Takashi Iwaid5681212005-08-30 08:58:37 +0200125 if (card)
126 carddev = card->dev;
127 register1 = register_sound_special_device(reg->f_ops, minor, carddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 if (register1 != minor)
129 goto __end;
130 if (track2 >= 0) {
Takashi Iwaid5681212005-08-30 08:58:37 +0200131 register2 = register_sound_special_device(reg->f_ops, track2, carddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 if (register2 != track2)
133 goto __end;
134 }
135 up(&sound_oss_mutex);
136 return 0;
137
138 __end:
139 if (register2 >= 0)
140 unregister_sound_special(register2);
141 if (register1 >= 0)
142 unregister_sound_special(register1);
143 list_del(&preg->list);
144 up(&sound_oss_mutex);
145 kfree(preg);
146 return -EBUSY;
147}
148
149int snd_unregister_oss_device(int type, snd_card_t * card, int dev)
150{
151 int minor = snd_oss_kernel_minor(type, card, dev);
152 int cidx = SNDRV_MINOR_OSS_CARD(minor);
153 int track2 = -1;
154 snd_minor_t *mptr;
155
156 if (minor < 0)
157 return minor;
158 down(&sound_oss_mutex);
159 mptr = snd_oss_minor_search(minor);
160 if (mptr == NULL) {
161 up(&sound_oss_mutex);
162 return -ENOENT;
163 }
164 unregister_sound_special(minor);
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 unregister_sound_special(track2);
178 list_del(&mptr->list);
179 up(&sound_oss_mutex);
180 kfree(mptr);
181 return 0;
182}
183
184/*
185 * INFO PART
186 */
187
188#ifdef CONFIG_PROC_FS
189
190static snd_info_entry_t *snd_minor_info_oss_entry = NULL;
191
192static void snd_minor_info_oss_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
193{
194 int card, dev;
195 struct list_head *list;
196 snd_minor_t *mptr;
197
198 down(&sound_oss_mutex);
199 for (card = 0; card < SNDRV_CARDS; card++) {
200 list_for_each(list, &snd_oss_minors_hash[card]) {
201 mptr = list_entry(list, snd_minor_t, list);
202 dev = SNDRV_MINOR_OSS_DEVICE(mptr->number);
203 if (dev != SNDRV_MINOR_OSS_SNDSTAT &&
204 dev != SNDRV_MINOR_OSS_SEQUENCER &&
205 dev != SNDRV_MINOR_OSS_MUSIC)
206 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment);
207 else
208 snd_iprintf(buffer, "%3i: : %s\n", mptr->number, mptr->comment);
209 }
210 }
211 up(&sound_oss_mutex);
212}
213
214#endif /* CONFIG_PROC_FS */
215
216int __init snd_minor_info_oss_init(void)
217{
218#ifdef CONFIG_PROC_FS
219 snd_info_entry_t *entry;
220
221 entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
222 if (entry) {
223 entry->c.text.read_size = PAGE_SIZE;
224 entry->c.text.read = snd_minor_info_oss_read;
225 if (snd_info_register(entry) < 0) {
226 snd_info_free_entry(entry);
227 entry = NULL;
228 }
229 }
230 snd_minor_info_oss_entry = entry;
231#endif
232 return 0;
233}
234
235int __exit snd_minor_info_oss_done(void)
236{
237#ifdef CONFIG_PROC_FS
238 if (snd_minor_info_oss_entry)
239 snd_info_unregister(snd_minor_info_oss_entry);
240#endif
241 return 0;
242}
243
244int __init snd_oss_init_module(void)
245{
246 int card;
247
248 for (card = 0; card < SNDRV_CARDS; card++)
249 INIT_LIST_HEAD(&snd_oss_minors_hash[card]);
250 return 0;
251}
252
253#endif /* CONFIG_SND_OSSEMUL */