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 #include <linux/mutex.h> 38 39 #define SNDRV_OSS_MINORS 128 40 41 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS]; 42 static DEFINE_MUTEX(sound_oss_mutex); 43 44 void *snd_lookup_oss_minor_data(unsigned int minor, int type) 45 { 46 struct snd_minor *mreg; 47 void *private_data; 48 49 if (minor >= ARRAY_SIZE(snd_oss_minors)) 50 return NULL; 51 mutex_lock(&sound_oss_mutex); 52 mreg = snd_oss_minors[minor]; 53 if (mreg && mreg->type == type) 54 private_data = mreg->private_data; 55 else 56 private_data = NULL; 57 mutex_unlock(&sound_oss_mutex); 58 return private_data; 59 } 60 61 EXPORT_SYMBOL(snd_lookup_oss_minor_data); 62 63 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev) 64 { 65 int minor; 66 67 switch (type) { 68 case SNDRV_OSS_DEVICE_TYPE_MIXER: 69 snd_assert(card != NULL && dev <= 1, 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 snd_assert(card != NULL && dev <= 1, 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 snd_assert(card != NULL && dev <= 1, return -EINVAL); 84 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI)); 85 break; 86 case SNDRV_OSS_DEVICE_TYPE_DMFM: 87 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM); 88 break; 89 case SNDRV_OSS_DEVICE_TYPE_SNDSTAT: 90 minor = SNDRV_MINOR_OSS_SNDSTAT; 91 break; 92 default: 93 return -EINVAL; 94 } 95 snd_assert(minor >= 0 && minor < SNDRV_OSS_MINORS, return -EINVAL); 96 return minor; 97 } 98 99 int snd_register_oss_device(int type, struct snd_card *card, int dev, 100 const struct file_operations *f_ops, void *private_data, 101 const char *name) 102 { 103 int minor = snd_oss_kernel_minor(type, card, dev); 104 int minor_unit; 105 struct snd_minor *preg; 106 int cidx = SNDRV_MINOR_OSS_CARD(minor); 107 int track2 = -1; 108 int register1 = -1, register2 = -1; 109 struct device *carddev = snd_card_get_device_link(card); 110 111 if (card && card->number >= 8) 112 return 0; /* ignore silently */ 113 if (minor < 0) 114 return minor; 115 preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL); 116 if (preg == NULL) 117 return -ENOMEM; 118 preg->type = type; 119 preg->card = card ? card->number : -1; 120 preg->device = dev; 121 preg->f_ops = f_ops; 122 preg->private_data = private_data; 123 mutex_lock(&sound_oss_mutex); 124 snd_oss_minors[minor] = preg; 125 minor_unit = SNDRV_MINOR_OSS_DEVICE(minor); 126 switch (minor_unit) { 127 case SNDRV_MINOR_OSS_PCM: 128 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); 129 break; 130 case SNDRV_MINOR_OSS_MIDI: 131 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); 132 break; 133 case SNDRV_MINOR_OSS_MIDI1: 134 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); 135 break; 136 } 137 register1 = register_sound_special_device(f_ops, minor, carddev); 138 if (register1 != minor) 139 goto __end; 140 if (track2 >= 0) { 141 register2 = register_sound_special_device(f_ops, track2, 142 carddev); 143 if (register2 != track2) 144 goto __end; 145 snd_oss_minors[track2] = preg; 146 } 147 mutex_unlock(&sound_oss_mutex); 148 return 0; 149 150 __end: 151 if (register2 >= 0) 152 unregister_sound_special(register2); 153 if (register1 >= 0) 154 unregister_sound_special(register1); 155 snd_oss_minors[minor] = NULL; 156 mutex_unlock(&sound_oss_mutex); 157 kfree(preg); 158 return -EBUSY; 159 } 160 161 EXPORT_SYMBOL(snd_register_oss_device); 162 163 int snd_unregister_oss_device(int type, struct snd_card *card, int dev) 164 { 165 int minor = snd_oss_kernel_minor(type, card, dev); 166 int cidx = SNDRV_MINOR_OSS_CARD(minor); 167 int track2 = -1; 168 struct snd_minor *mptr; 169 170 if (card && card->number >= 8) 171 return 0; 172 if (minor < 0) 173 return minor; 174 mutex_lock(&sound_oss_mutex); 175 mptr = snd_oss_minors[minor]; 176 if (mptr == NULL) { 177 mutex_unlock(&sound_oss_mutex); 178 return -ENOENT; 179 } 180 unregister_sound_special(minor); 181 switch (SNDRV_MINOR_OSS_DEVICE(minor)) { 182 case SNDRV_MINOR_OSS_PCM: 183 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); 184 break; 185 case SNDRV_MINOR_OSS_MIDI: 186 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); 187 break; 188 case SNDRV_MINOR_OSS_MIDI1: 189 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); 190 break; 191 } 192 if (track2 >= 0) { 193 unregister_sound_special(track2); 194 snd_oss_minors[track2] = NULL; 195 } 196 snd_oss_minors[minor] = NULL; 197 mutex_unlock(&sound_oss_mutex); 198 kfree(mptr); 199 return 0; 200 } 201 202 EXPORT_SYMBOL(snd_unregister_oss_device); 203 204 /* 205 * INFO PART 206 */ 207 208 #ifdef CONFIG_PROC_FS 209 210 static struct snd_info_entry *snd_minor_info_oss_entry; 211 212 static const char *snd_oss_device_type_name(int type) 213 { 214 switch (type) { 215 case SNDRV_OSS_DEVICE_TYPE_MIXER: 216 return "mixer"; 217 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER: 218 case SNDRV_OSS_DEVICE_TYPE_MUSIC: 219 return "sequencer"; 220 case SNDRV_OSS_DEVICE_TYPE_PCM: 221 return "digital audio"; 222 case SNDRV_OSS_DEVICE_TYPE_MIDI: 223 return "raw midi"; 224 case SNDRV_OSS_DEVICE_TYPE_DMFM: 225 return "hardware dependent"; 226 default: 227 return "?"; 228 } 229 } 230 231 static void snd_minor_info_oss_read(struct snd_info_entry *entry, 232 struct snd_info_buffer *buffer) 233 { 234 int minor; 235 struct snd_minor *mptr; 236 237 mutex_lock(&sound_oss_mutex); 238 for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) { 239 if (!(mptr = snd_oss_minors[minor])) 240 continue; 241 if (mptr->card >= 0) 242 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor, 243 mptr->card, mptr->device, 244 snd_oss_device_type_name(mptr->type)); 245 else 246 snd_iprintf(buffer, "%3i: : %s\n", minor, 247 snd_oss_device_type_name(mptr->type)); 248 } 249 mutex_unlock(&sound_oss_mutex); 250 } 251 252 253 int __init snd_minor_info_oss_init(void) 254 { 255 struct snd_info_entry *entry; 256 257 entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root); 258 if (entry) { 259 entry->c.text.read = snd_minor_info_oss_read; 260 if (snd_info_register(entry) < 0) { 261 snd_info_free_entry(entry); 262 entry = NULL; 263 } 264 } 265 snd_minor_info_oss_entry = entry; 266 return 0; 267 } 268 269 int __exit snd_minor_info_oss_done(void) 270 { 271 snd_info_free_entry(snd_minor_info_oss_entry); 272 return 0; 273 } 274 #endif /* CONFIG_PROC_FS */ 275 276 #endif /* CONFIG_SND_OSSEMUL */ 277