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/slab.h> 30 #include <linux/time.h> 31 #include <sound/core.h> 32 #include <sound/minors.h> 33 #include <sound/info.h> 34 #include <linux/sound.h> 35 #include <linux/mutex.h> 36 37 #define SNDRV_OSS_MINORS 128 38 39 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS]; 40 static DEFINE_MUTEX(sound_oss_mutex); 41 42 void *snd_lookup_oss_minor_data(unsigned int minor, int type) 43 { 44 struct snd_minor *mreg; 45 void *private_data; 46 47 if (minor >= ARRAY_SIZE(snd_oss_minors)) 48 return NULL; 49 mutex_lock(&sound_oss_mutex); 50 mreg = snd_oss_minors[minor]; 51 if (mreg && mreg->type == type) 52 private_data = mreg->private_data; 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 snd_assert(card != NULL && dev <= 1, return -EINVAL); 68 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER)); 69 break; 70 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER: 71 minor = SNDRV_MINOR_OSS_SEQUENCER; 72 break; 73 case SNDRV_OSS_DEVICE_TYPE_MUSIC: 74 minor = SNDRV_MINOR_OSS_MUSIC; 75 break; 76 case SNDRV_OSS_DEVICE_TYPE_PCM: 77 snd_assert(card != NULL && dev <= 1, return -EINVAL); 78 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM)); 79 break; 80 case SNDRV_OSS_DEVICE_TYPE_MIDI: 81 snd_assert(card != NULL && dev <= 1, return -EINVAL); 82 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI)); 83 break; 84 case SNDRV_OSS_DEVICE_TYPE_DMFM: 85 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM); 86 break; 87 case SNDRV_OSS_DEVICE_TYPE_SNDSTAT: 88 minor = SNDRV_MINOR_OSS_SNDSTAT; 89 break; 90 default: 91 return -EINVAL; 92 } 93 snd_assert(minor >= 0 && minor < SNDRV_OSS_MINORS, return -EINVAL); 94 return minor; 95 } 96 97 int snd_register_oss_device(int type, struct snd_card *card, int dev, 98 const struct file_operations *f_ops, void *private_data, 99 const char *name) 100 { 101 int minor = snd_oss_kernel_minor(type, card, dev); 102 int minor_unit; 103 struct snd_minor *preg; 104 int cidx = SNDRV_MINOR_OSS_CARD(minor); 105 int track2 = -1; 106 int register1 = -1, register2 = -1; 107 struct device *carddev = snd_card_get_device_link(card); 108 109 if (card && card->number >= 8) 110 return 0; /* ignore silently */ 111 if (minor < 0) 112 return minor; 113 preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL); 114 if (preg == NULL) 115 return -ENOMEM; 116 preg->type = type; 117 preg->card = card ? card->number : -1; 118 preg->device = dev; 119 preg->f_ops = f_ops; 120 preg->private_data = private_data; 121 mutex_lock(&sound_oss_mutex); 122 snd_oss_minors[minor] = preg; 123 minor_unit = SNDRV_MINOR_OSS_DEVICE(minor); 124 switch (minor_unit) { 125 case SNDRV_MINOR_OSS_PCM: 126 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); 127 break; 128 case SNDRV_MINOR_OSS_MIDI: 129 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); 130 break; 131 case SNDRV_MINOR_OSS_MIDI1: 132 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); 133 break; 134 } 135 register1 = register_sound_special_device(f_ops, minor, carddev); 136 if (register1 != minor) 137 goto __end; 138 if (track2 >= 0) { 139 register2 = register_sound_special_device(f_ops, track2, 140 carddev); 141 if (register2 != track2) 142 goto __end; 143 snd_oss_minors[track2] = preg; 144 } 145 mutex_unlock(&sound_oss_mutex); 146 return 0; 147 148 __end: 149 if (register2 >= 0) 150 unregister_sound_special(register2); 151 if (register1 >= 0) 152 unregister_sound_special(register1); 153 snd_oss_minors[minor] = NULL; 154 mutex_unlock(&sound_oss_mutex); 155 kfree(preg); 156 return -EBUSY; 157 } 158 159 EXPORT_SYMBOL(snd_register_oss_device); 160 161 int snd_unregister_oss_device(int type, struct snd_card *card, int dev) 162 { 163 int minor = snd_oss_kernel_minor(type, card, dev); 164 int cidx = SNDRV_MINOR_OSS_CARD(minor); 165 int track2 = -1; 166 struct snd_minor *mptr; 167 168 if (card && card->number >= 8) 169 return 0; 170 if (minor < 0) 171 return minor; 172 mutex_lock(&sound_oss_mutex); 173 mptr = snd_oss_minors[minor]; 174 if (mptr == NULL) { 175 mutex_unlock(&sound_oss_mutex); 176 return -ENOENT; 177 } 178 unregister_sound_special(minor); 179 switch (SNDRV_MINOR_OSS_DEVICE(minor)) { 180 case SNDRV_MINOR_OSS_PCM: 181 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); 182 break; 183 case SNDRV_MINOR_OSS_MIDI: 184 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); 185 break; 186 case SNDRV_MINOR_OSS_MIDI1: 187 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); 188 break; 189 } 190 if (track2 >= 0) { 191 unregister_sound_special(track2); 192 snd_oss_minors[track2] = NULL; 193 } 194 snd_oss_minors[minor] = NULL; 195 mutex_unlock(&sound_oss_mutex); 196 kfree(mptr); 197 return 0; 198 } 199 200 EXPORT_SYMBOL(snd_unregister_oss_device); 201 202 /* 203 * INFO PART 204 */ 205 206 #ifdef CONFIG_PROC_FS 207 208 static struct snd_info_entry *snd_minor_info_oss_entry; 209 210 static const char *snd_oss_device_type_name(int type) 211 { 212 switch (type) { 213 case SNDRV_OSS_DEVICE_TYPE_MIXER: 214 return "mixer"; 215 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER: 216 case SNDRV_OSS_DEVICE_TYPE_MUSIC: 217 return "sequencer"; 218 case SNDRV_OSS_DEVICE_TYPE_PCM: 219 return "digital audio"; 220 case SNDRV_OSS_DEVICE_TYPE_MIDI: 221 return "raw midi"; 222 case SNDRV_OSS_DEVICE_TYPE_DMFM: 223 return "hardware dependent"; 224 default: 225 return "?"; 226 } 227 } 228 229 static void snd_minor_info_oss_read(struct snd_info_entry *entry, 230 struct snd_info_buffer *buffer) 231 { 232 int minor; 233 struct snd_minor *mptr; 234 235 mutex_lock(&sound_oss_mutex); 236 for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) { 237 if (!(mptr = snd_oss_minors[minor])) 238 continue; 239 if (mptr->card >= 0) 240 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor, 241 mptr->card, mptr->device, 242 snd_oss_device_type_name(mptr->type)); 243 else 244 snd_iprintf(buffer, "%3i: : %s\n", minor, 245 snd_oss_device_type_name(mptr->type)); 246 } 247 mutex_unlock(&sound_oss_mutex); 248 } 249 250 251 int __init snd_minor_info_oss_init(void) 252 { 253 struct snd_info_entry *entry; 254 255 entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root); 256 if (entry) { 257 entry->c.text.read = snd_minor_info_oss_read; 258 if (snd_info_register(entry) < 0) { 259 snd_info_free_entry(entry); 260 entry = NULL; 261 } 262 } 263 snd_minor_info_oss_entry = entry; 264 return 0; 265 } 266 267 int __exit snd_minor_info_oss_done(void) 268 { 269 snd_info_free_entry(snd_minor_info_oss_entry); 270 return 0; 271 } 272 #endif /* CONFIG_PROC_FS */ 273 274 #endif /* CONFIG_SND_OSSEMUL */ 275