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Linux/sound/core/sound_oss.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *  Advanced Linux Sound Architecture
  4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  5  */
  6 
  7 #include <linux/init.h>
  8 #include <linux/export.h>
  9 #include <linux/slab.h>
 10 #include <linux/time.h>
 11 #include <sound/core.h>
 12 #include <sound/minors.h>
 13 #include <sound/info.h>
 14 #include <linux/sound.h>
 15 #include <linux/mutex.h>
 16 
 17 #define SNDRV_OSS_MINORS 256
 18 
 19 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
 20 static DEFINE_MUTEX(sound_oss_mutex);
 21 
 22 /* NOTE: This function increments the refcount of the associated card like
 23  * snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
 24  */
 25 void *snd_lookup_oss_minor_data(unsigned int minor, int type)
 26 {
 27         struct snd_minor *mreg;
 28         void *private_data;
 29 
 30         if (minor >= ARRAY_SIZE(snd_oss_minors))
 31                 return NULL;
 32         mutex_lock(&sound_oss_mutex);
 33         mreg = snd_oss_minors[minor];
 34         if (mreg && mreg->type == type) {
 35                 private_data = mreg->private_data;
 36                 if (private_data && mreg->card_ptr)
 37                         get_device(&mreg->card_ptr->card_dev);
 38         } else
 39                 private_data = NULL;
 40         mutex_unlock(&sound_oss_mutex);
 41         return private_data;
 42 }
 43 EXPORT_SYMBOL(snd_lookup_oss_minor_data);
 44 
 45 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
 46 {
 47         int minor;
 48 
 49         switch (type) {
 50         case SNDRV_OSS_DEVICE_TYPE_MIXER:
 51                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
 52                         return -EINVAL;
 53                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
 54                 break;
 55         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
 56                 minor = SNDRV_MINOR_OSS_SEQUENCER;
 57                 break;
 58         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
 59                 minor = SNDRV_MINOR_OSS_MUSIC;
 60                 break;
 61         case SNDRV_OSS_DEVICE_TYPE_PCM:
 62                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
 63                         return -EINVAL;
 64                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
 65                 break;
 66         case SNDRV_OSS_DEVICE_TYPE_MIDI:
 67                 if (snd_BUG_ON(!card || dev < 0 || dev > 1))
 68                         return -EINVAL;
 69                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
 70                 break;
 71         case SNDRV_OSS_DEVICE_TYPE_DMFM:
 72                 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
 73                 break;
 74         case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
 75                 minor = SNDRV_MINOR_OSS_SNDSTAT;
 76                 break;
 77         default:
 78                 return -EINVAL;
 79         }
 80         if (minor < 0 || minor >= SNDRV_OSS_MINORS)
 81                 return -EINVAL;
 82         return minor;
 83 }
 84 
 85 int snd_register_oss_device(int type, struct snd_card *card, int dev,
 86                             const struct file_operations *f_ops, void *private_data)
 87 {
 88         int minor = snd_oss_kernel_minor(type, card, dev);
 89         int minor_unit;
 90         struct snd_minor *preg;
 91         int cidx = SNDRV_MINOR_OSS_CARD(minor);
 92         int track2 = -1;
 93         int register1 = -1, register2 = -1;
 94         struct device *carddev = snd_card_get_device_link(card);
 95 
 96         if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
 97                 return 0; /* ignore silently */
 98         if (minor < 0)
 99                 return minor;
100         preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
101         if (preg == NULL)
102                 return -ENOMEM;
103         preg->type = type;
104         preg->card = card ? card->number : -1;
105         preg->device = dev;
106         preg->f_ops = f_ops;
107         preg->private_data = private_data;
108         preg->card_ptr = card;
109         mutex_lock(&sound_oss_mutex);
110         snd_oss_minors[minor] = preg;
111         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
112         switch (minor_unit) {
113         case SNDRV_MINOR_OSS_PCM:
114                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
115                 break;
116         case SNDRV_MINOR_OSS_MIDI:
117                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
118                 break;
119         case SNDRV_MINOR_OSS_MIDI1:
120                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
121                 break;
122         }
123         register1 = register_sound_special_device(f_ops, minor, carddev);
124         if (register1 != minor)
125                 goto __end;
126         if (track2 >= 0) {
127                 register2 = register_sound_special_device(f_ops, track2,
128                                                           carddev);
129                 if (register2 != track2)
130                         goto __end;
131                 snd_oss_minors[track2] = preg;
132         }
133         mutex_unlock(&sound_oss_mutex);
134         return 0;
135 
136       __end:
137         if (register2 >= 0)
138                 unregister_sound_special(register2);
139         if (register1 >= 0)
140                 unregister_sound_special(register1);
141         snd_oss_minors[minor] = NULL;
142         mutex_unlock(&sound_oss_mutex);
143         kfree(preg);
144         return -EBUSY;
145 }
146 EXPORT_SYMBOL(snd_register_oss_device);
147 
148 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
149 {
150         int minor = snd_oss_kernel_minor(type, card, dev);
151         int cidx = SNDRV_MINOR_OSS_CARD(minor);
152         int track2 = -1;
153         struct snd_minor *mptr;
154 
155         if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
156                 return 0;
157         if (minor < 0)
158                 return minor;
159         mutex_lock(&sound_oss_mutex);
160         mptr = snd_oss_minors[minor];
161         if (mptr == NULL) {
162                 mutex_unlock(&sound_oss_mutex);
163                 return -ENOENT;
164         }
165         unregister_sound_special(minor);
166         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
167         case SNDRV_MINOR_OSS_PCM:
168                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
169                 break;
170         case SNDRV_MINOR_OSS_MIDI:
171                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
172                 break;
173         case SNDRV_MINOR_OSS_MIDI1:
174                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
175                 break;
176         }
177         if (track2 >= 0) {
178                 unregister_sound_special(track2);
179                 snd_oss_minors[track2] = NULL;
180         }
181         snd_oss_minors[minor] = NULL;
182         mutex_unlock(&sound_oss_mutex);
183         kfree(mptr);
184         return 0;
185 }
186 EXPORT_SYMBOL(snd_unregister_oss_device);
187 
188 /*
189  *  INFO PART
190  */
191 
192 #ifdef CONFIG_SND_PROC_FS
193 static const char *snd_oss_device_type_name(int type)
194 {
195         switch (type) {
196         case SNDRV_OSS_DEVICE_TYPE_MIXER:
197                 return "mixer";
198         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
199         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
200                 return "sequencer";
201         case SNDRV_OSS_DEVICE_TYPE_PCM:
202                 return "digital audio";
203         case SNDRV_OSS_DEVICE_TYPE_MIDI:
204                 return "raw midi";
205         case SNDRV_OSS_DEVICE_TYPE_DMFM:
206                 return "hardware dependent";
207         default:
208                 return "?";
209         }
210 }
211 
212 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
213                                     struct snd_info_buffer *buffer)
214 {
215         int minor;
216         struct snd_minor *mptr;
217 
218         mutex_lock(&sound_oss_mutex);
219         for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
220                 mptr = snd_oss_minors[minor];
221                 if (!mptr)
222                         continue;
223                 if (mptr->card >= 0)
224                         snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
225                                     mptr->card, mptr->device,
226                                     snd_oss_device_type_name(mptr->type));
227                 else
228                         snd_iprintf(buffer, "%3i:       : %s\n", minor,
229                                     snd_oss_device_type_name(mptr->type));
230         }
231         mutex_unlock(&sound_oss_mutex);
232 }
233 
234 
235 int __init snd_minor_info_oss_init(void)
236 {
237         struct snd_info_entry *entry;
238 
239         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
240         if (!entry)
241                 return -ENOMEM;
242         entry->c.text.read = snd_minor_info_oss_read;
243         return snd_info_register(entry); /* freed in error path */
244 }
245 #endif /* CONFIG_SND_PROC_FS */
246 

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