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 #ifdef CONFIG_SND_OSSEMUL 23 24 #if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE)) 25 #error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel." 26 #endif 27 28 #include <linux/init.h> 29 #include <linux/export.h> 30 #include <linux/slab.h> 31 #include <linux/time.h> 32 #include <sound/core.h> 33 #include <sound/minors.h> 34 #include <sound/info.h> 35 #include <linux/sound.h> 36 #include <linux/mutex.h> 37 38 #define SNDRV_OSS_MINORS 256 39 40 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS]; 41 static DEFINE_MUTEX(sound_oss_mutex); 42 43 /* NOTE: This function increments the refcount of the associated card like 44 * snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately 45 */ 46 void *snd_lookup_oss_minor_data(unsigned int minor, int type) 47 { 48 struct snd_minor *mreg; 49 void *private_data; 50 51 if (minor >= ARRAY_SIZE(snd_oss_minors)) 52 return NULL; 53 mutex_lock(&sound_oss_mutex); 54 mreg = snd_oss_minors[minor]; 55 if (mreg && mreg->type == type) { 56 private_data = mreg->private_data; 57 if (private_data && mreg->card_ptr) 58 atomic_inc(&mreg->card_ptr->refcount); 59 } else 60 private_data = NULL; 61 mutex_unlock(&sound_oss_mutex); 62 return private_data; 63 } 64 65 EXPORT_SYMBOL(snd_lookup_oss_minor_data); 66 67 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev) 68 { 69 int minor; 70 71 switch (type) { 72 case SNDRV_OSS_DEVICE_TYPE_MIXER: 73 if (snd_BUG_ON(!card || dev < 0 || dev > 1)) 74 return -EINVAL; 75 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER)); 76 break; 77 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER: 78 minor = SNDRV_MINOR_OSS_SEQUENCER; 79 break; 80 case SNDRV_OSS_DEVICE_TYPE_MUSIC: 81 minor = SNDRV_MINOR_OSS_MUSIC; 82 break; 83 case SNDRV_OSS_DEVICE_TYPE_PCM: 84 if (snd_BUG_ON(!card || dev < 0 || dev > 1)) 85 return -EINVAL; 86 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM)); 87 break; 88 case SNDRV_OSS_DEVICE_TYPE_MIDI: 89 if (snd_BUG_ON(!card || dev < 0 || dev > 1)) 90 return -EINVAL; 91 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI)); 92 break; 93 case SNDRV_OSS_DEVICE_TYPE_DMFM: 94 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM); 95 break; 96 case SNDRV_OSS_DEVICE_TYPE_SNDSTAT: 97 minor = SNDRV_MINOR_OSS_SNDSTAT; 98 break; 99 default: 100 return -EINVAL; 101 } 102 if (minor < 0 || minor >= SNDRV_OSS_MINORS) 103 return -EINVAL; 104 return minor; 105 } 106 107 int snd_register_oss_device(int type, struct snd_card *card, int dev, 108 const struct file_operations *f_ops, void *private_data, 109 const char *name) 110 { 111 int minor = snd_oss_kernel_minor(type, card, dev); 112 int minor_unit; 113 struct snd_minor *preg; 114 int cidx = SNDRV_MINOR_OSS_CARD(minor); 115 int track2 = -1; 116 int register1 = -1, register2 = -1; 117 struct device *carddev = snd_card_get_device_link(card); 118 119 if (card && card->number >= SNDRV_MINOR_OSS_DEVICES) 120 return 0; /* ignore silently */ 121 if (minor < 0) 122 return minor; 123 preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL); 124 if (preg == NULL) 125 return -ENOMEM; 126 preg->type = type; 127 preg->card = card ? card->number : -1; 128 preg->device = dev; 129 preg->f_ops = f_ops; 130 preg->private_data = private_data; 131 preg->card_ptr = card; 132 mutex_lock(&sound_oss_mutex); 133 snd_oss_minors[minor] = preg; 134 minor_unit = SNDRV_MINOR_OSS_DEVICE(minor); 135 switch (minor_unit) { 136 case SNDRV_MINOR_OSS_PCM: 137 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); 138 break; 139 case SNDRV_MINOR_OSS_MIDI: 140 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); 141 break; 142 case SNDRV_MINOR_OSS_MIDI1: 143 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); 144 break; 145 } 146 register1 = register_sound_special_device(f_ops, minor, carddev); 147 if (register1 != minor) 148 goto __end; 149 if (track2 >= 0) { 150 register2 = register_sound_special_device(f_ops, track2, 151 carddev); 152 if (register2 != track2) 153 goto __end; 154 snd_oss_minors[track2] = preg; 155 } 156 mutex_unlock(&sound_oss_mutex); 157 return 0; 158 159 __end: 160 if (register2 >= 0) 161 unregister_sound_special(register2); 162 if (register1 >= 0) 163 unregister_sound_special(register1); 164 snd_oss_minors[minor] = NULL; 165 mutex_unlock(&sound_oss_mutex); 166 kfree(preg); 167 return -EBUSY; 168 } 169 170 EXPORT_SYMBOL(snd_register_oss_device); 171 172 int snd_unregister_oss_device(int type, struct snd_card *card, int dev) 173 { 174 int minor = snd_oss_kernel_minor(type, card, dev); 175 int cidx = SNDRV_MINOR_OSS_CARD(minor); 176 int track2 = -1; 177 struct snd_minor *mptr; 178 179 if (card && card->number >= SNDRV_MINOR_OSS_DEVICES) 180 return 0; 181 if (minor < 0) 182 return minor; 183 mutex_lock(&sound_oss_mutex); 184 mptr = snd_oss_minors[minor]; 185 if (mptr == NULL) { 186 mutex_unlock(&sound_oss_mutex); 187 return -ENOENT; 188 } 189 unregister_sound_special(minor); 190 switch (SNDRV_MINOR_OSS_DEVICE(minor)) { 191 case SNDRV_MINOR_OSS_PCM: 192 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); 193 break; 194 case SNDRV_MINOR_OSS_MIDI: 195 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); 196 break; 197 case SNDRV_MINOR_OSS_MIDI1: 198 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); 199 break; 200 } 201 if (track2 >= 0) { 202 unregister_sound_special(track2); 203 snd_oss_minors[track2] = NULL; 204 } 205 snd_oss_minors[minor] = NULL; 206 mutex_unlock(&sound_oss_mutex); 207 kfree(mptr); 208 return 0; 209 } 210 211 EXPORT_SYMBOL(snd_unregister_oss_device); 212 213 /* 214 * INFO PART 215 */ 216 217 #ifdef CONFIG_PROC_FS 218 219 static struct snd_info_entry *snd_minor_info_oss_entry; 220 221 static const char *snd_oss_device_type_name(int type) 222 { 223 switch (type) { 224 case SNDRV_OSS_DEVICE_TYPE_MIXER: 225 return "mixer"; 226 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER: 227 case SNDRV_OSS_DEVICE_TYPE_MUSIC: 228 return "sequencer"; 229 case SNDRV_OSS_DEVICE_TYPE_PCM: 230 return "digital audio"; 231 case SNDRV_OSS_DEVICE_TYPE_MIDI: 232 return "raw midi"; 233 case SNDRV_OSS_DEVICE_TYPE_DMFM: 234 return "hardware dependent"; 235 default: 236 return "?"; 237 } 238 } 239 240 static void snd_minor_info_oss_read(struct snd_info_entry *entry, 241 struct snd_info_buffer *buffer) 242 { 243 int minor; 244 struct snd_minor *mptr; 245 246 mutex_lock(&sound_oss_mutex); 247 for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) { 248 if (!(mptr = snd_oss_minors[minor])) 249 continue; 250 if (mptr->card >= 0) 251 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor, 252 mptr->card, mptr->device, 253 snd_oss_device_type_name(mptr->type)); 254 else 255 snd_iprintf(buffer, "%3i: : %s\n", minor, 256 snd_oss_device_type_name(mptr->type)); 257 } 258 mutex_unlock(&sound_oss_mutex); 259 } 260 261 262 int __init snd_minor_info_oss_init(void) 263 { 264 struct snd_info_entry *entry; 265 266 entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root); 267 if (entry) { 268 entry->c.text.read = snd_minor_info_oss_read; 269 if (snd_info_register(entry) < 0) { 270 snd_info_free_entry(entry); 271 entry = NULL; 272 } 273 } 274 snd_minor_info_oss_entry = entry; 275 return 0; 276 } 277 278 int __exit snd_minor_info_oss_done(void) 279 { 280 snd_info_free_entry(snd_minor_info_oss_entry); 281 return 0; 282 } 283 #endif /* CONFIG_PROC_FS */ 284 285 #endif /* CONFIG_SND_OSSEMUL */ 286