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TOMOYO Linux Cross Reference
Linux/sound/core/sound_oss.c

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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 
 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 */
263 

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