xref: /openbmc/linux/sound/core/sound_oss.c (revision 87c2ce3b)
1 /*
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_OSS_MINORS 128
39 
40 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
41 static DECLARE_MUTEX(sound_oss_mutex);
42 
43 void *snd_lookup_oss_minor_data(unsigned int minor, int type)
44 {
45 	struct snd_minor *mreg;
46 	void *private_data;
47 
48 	if (minor > ARRAY_SIZE(snd_oss_minors))
49 		return NULL;
50 	down(&sound_oss_mutex);
51 	mreg = snd_oss_minors[minor];
52 	if (mreg && mreg->type == type)
53 		private_data = mreg->private_data;
54 	else
55 		private_data = NULL;
56 	up(&sound_oss_mutex);
57 	return private_data;
58 }
59 
60 static 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 		snd_assert(card != NULL && dev <= 1, return -EINVAL);
67 		minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
68 		break;
69 	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
70 		minor = SNDRV_MINOR_OSS_SEQUENCER;
71 		break;
72 	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
73 		minor = SNDRV_MINOR_OSS_MUSIC;
74 		break;
75 	case SNDRV_OSS_DEVICE_TYPE_PCM:
76 		snd_assert(card != NULL && dev <= 1, return -EINVAL);
77 		minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
78 		break;
79 	case SNDRV_OSS_DEVICE_TYPE_MIDI:
80 		snd_assert(card != NULL && dev <= 1, return -EINVAL);
81 		minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
82 		break;
83 	case SNDRV_OSS_DEVICE_TYPE_DMFM:
84 		minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
85 		break;
86 	case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
87 		minor = SNDRV_MINOR_OSS_SNDSTAT;
88 		break;
89 	default:
90 		return -EINVAL;
91 	}
92 	snd_assert(minor >= 0 && minor < SNDRV_OSS_MINORS, return -EINVAL);
93 	return minor;
94 }
95 
96 int snd_register_oss_device(int type, struct snd_card *card, int dev,
97 			    struct file_operations *f_ops, void *private_data,
98 			    const char *name)
99 {
100 	int minor = snd_oss_kernel_minor(type, card, dev);
101 	int minor_unit;
102 	struct snd_minor *preg;
103 	int cidx = SNDRV_MINOR_OSS_CARD(minor);
104 	int track2 = -1;
105 	int register1 = -1, register2 = -1;
106 	struct device *carddev = NULL;
107 
108 	if (card && card->number >= 8)
109 		return 0; /* ignore silently */
110 	if (minor < 0)
111 		return minor;
112 	preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
113 	if (preg == NULL)
114 		return -ENOMEM;
115 	preg->type = type;
116 	preg->card = card ? card->number : -1;
117 	preg->device = dev;
118 	preg->f_ops = f_ops;
119 	preg->private_data = private_data;
120 	down(&sound_oss_mutex);
121 	snd_oss_minors[minor] = preg;
122 	minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
123 	switch (minor_unit) {
124 	case SNDRV_MINOR_OSS_PCM:
125 		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
126 		break;
127 	case SNDRV_MINOR_OSS_MIDI:
128 		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
129 		break;
130 	case SNDRV_MINOR_OSS_MIDI1:
131 		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
132 		break;
133 	}
134 	if (card)
135 		carddev = card->dev;
136 	register1 = register_sound_special_device(f_ops, minor, carddev);
137 	if (register1 != minor)
138 		goto __end;
139 	if (track2 >= 0) {
140 		register2 = register_sound_special_device(f_ops, track2,
141 							  carddev);
142 		if (register2 != track2)
143 			goto __end;
144 		snd_oss_minors[track2] = preg;
145 	}
146 	up(&sound_oss_mutex);
147 	return 0;
148 
149       __end:
150       	if (register2 >= 0)
151       		unregister_sound_special(register2);
152       	if (register1 >= 0)
153       		unregister_sound_special(register1);
154 	snd_oss_minors[minor] = NULL;
155 	up(&sound_oss_mutex);
156 	kfree(preg);
157       	return -EBUSY;
158 }
159 
160 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
161 {
162 	int minor = snd_oss_kernel_minor(type, card, dev);
163 	int cidx = SNDRV_MINOR_OSS_CARD(minor);
164 	int track2 = -1;
165 	struct snd_minor *mptr;
166 
167 	if (card && card->number >= 8)
168 		return 0;
169 	if (minor < 0)
170 		return minor;
171 	down(&sound_oss_mutex);
172 	mptr = snd_oss_minors[minor];
173 	if (mptr == NULL) {
174 		up(&sound_oss_mutex);
175 		return -ENOENT;
176 	}
177 	unregister_sound_special(minor);
178 	switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
179 	case SNDRV_MINOR_OSS_PCM:
180 		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
181 		break;
182 	case SNDRV_MINOR_OSS_MIDI:
183 		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
184 		break;
185 	case SNDRV_MINOR_OSS_MIDI1:
186 		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
187 		break;
188 	}
189 	if (track2 >= 0) {
190 		unregister_sound_special(track2);
191 		snd_oss_minors[track2] = NULL;
192 	}
193 	snd_oss_minors[minor] = NULL;
194 	up(&sound_oss_mutex);
195 	kfree(mptr);
196 	return 0;
197 }
198 
199 /*
200  *  INFO PART
201  */
202 
203 #ifdef CONFIG_PROC_FS
204 
205 static struct snd_info_entry *snd_minor_info_oss_entry = NULL;
206 
207 static const char *snd_oss_device_type_name(int type)
208 {
209 	switch (type) {
210 	case SNDRV_OSS_DEVICE_TYPE_MIXER:
211 		return "mixer";
212 	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
213 	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
214 		return "sequencer";
215 	case SNDRV_OSS_DEVICE_TYPE_PCM:
216 		return "digital audio";
217 	case SNDRV_OSS_DEVICE_TYPE_MIDI:
218 		return "raw midi";
219 	case SNDRV_OSS_DEVICE_TYPE_DMFM:
220 		return "hardware dependent";
221 	default:
222 		return "?";
223 	}
224 }
225 
226 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
227 				    struct snd_info_buffer *buffer)
228 {
229 	int minor;
230 	struct snd_minor *mptr;
231 
232 	down(&sound_oss_mutex);
233 	for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
234 		if (!(mptr = snd_oss_minors[minor]))
235 			continue;
236 		if (mptr->card >= 0)
237 			snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
238 				    mptr->card, mptr->device,
239 				    snd_oss_device_type_name(mptr->type));
240 		else
241 			snd_iprintf(buffer, "%3i:       : %s\n", minor,
242 				    snd_oss_device_type_name(mptr->type));
243 	}
244 	up(&sound_oss_mutex);
245 }
246 
247 
248 int __init snd_minor_info_oss_init(void)
249 {
250 	struct snd_info_entry *entry;
251 
252 	entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
253 	if (entry) {
254 		entry->c.text.read_size = PAGE_SIZE;
255 		entry->c.text.read = snd_minor_info_oss_read;
256 		if (snd_info_register(entry) < 0) {
257 			snd_info_free_entry(entry);
258 			entry = NULL;
259 		}
260 	}
261 	snd_minor_info_oss_entry = entry;
262 	return 0;
263 }
264 
265 int __exit snd_minor_info_oss_done(void)
266 {
267 	if (snd_minor_info_oss_entry)
268 		snd_info_unregister(snd_minor_info_oss_entry);
269 	return 0;
270 }
271 #endif /* CONFIG_PROC_FS */
272 
273 #endif /* CONFIG_SND_OSSEMUL */
274