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