]>
Commit | Line | Data |
---|---|---|
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 | ||
34 | static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS]; | |
35 | static 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 | */ | |
40 | void *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 | ||
59 | EXPORT_SYMBOL(snd_lookup_oss_minor_data); | |
60 | ||
61 | static 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 | ||
101 | int 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 | ||
163 | EXPORT_SYMBOL(snd_register_oss_device); | |
164 | ||
165 | int 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 | ||
204 | EXPORT_SYMBOL(snd_unregister_oss_device); | |
205 | ||
206 | /* | |
207 | * INFO PART | |
208 | */ | |
209 | ||
210 | #ifdef CONFIG_SND_PROC_FS | |
211 | static 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 | ||
230 | static 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 | ||
252 | int __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 */ |