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 38 #define SNDRV_OSS_MINORS 128 39 40 static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS]; 41 static DECLARE_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 down(&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 up(&sound_oss_mutex); 57 return private_data; 58 } 59 60 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev) 61 { 62 int minor; 63 64 switch (type) { 65 case SNDRV_OSS_DEVICE_TYPE_MIXER: 66 snd_assert(card != NULL && dev <= 1, return -EINVAL); 67 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER)); 68 break; 69 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER: 70 minor = SNDRV_MINOR_OSS_SEQUENCER; 71 break; 72 case SNDRV_OSS_DEVICE_TYPE_MUSIC: 73 minor = SNDRV_MINOR_OSS_MUSIC; 74 break; 75 case SNDRV_OSS_DEVICE_TYPE_PCM: 76 snd_assert(card != NULL && dev <= 1, return -EINVAL); 77 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM)); 78 break; 79 case SNDRV_OSS_DEVICE_TYPE_MIDI: 80 snd_assert(card != NULL && dev <= 1, return -EINVAL); 81 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI)); 82 break; 83 case SNDRV_OSS_DEVICE_TYPE_DMFM: 84 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM); 85 break; 86 case SNDRV_OSS_DEVICE_TYPE_SNDSTAT: 87 minor = SNDRV_MINOR_OSS_SNDSTAT; 88 break; 89 default: 90 return -EINVAL; 91 } 92 snd_assert(minor >= 0 && minor < SNDRV_OSS_MINORS, return -EINVAL); 93 return minor; 94 } 95 96 int snd_register_oss_device(int type, struct snd_card *card, int dev, 97 struct file_operations *f_ops, void *private_data, 98 const char *name) 99 { 100 int minor = snd_oss_kernel_minor(type, card, dev); 101 int minor_unit; 102 struct snd_minor *preg; 103 int cidx = SNDRV_MINOR_OSS_CARD(minor); 104 int track2 = -1; 105 int register1 = -1, register2 = -1; 106 struct device *carddev = NULL; 107 108 if (card && card->number >= 8) 109 return 0; /* ignore silently */ 110 if (minor < 0) 111 return minor; 112 preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL); 113 if (preg == NULL) 114 return -ENOMEM; 115 preg->type = type; 116 preg->card = card ? card->number : -1; 117 preg->device = dev; 118 preg->f_ops = f_ops; 119 preg->private_data = private_data; 120 down(&sound_oss_mutex); 121 snd_oss_minors[minor] = preg; 122 minor_unit = SNDRV_MINOR_OSS_DEVICE(minor); 123 switch (minor_unit) { 124 case SNDRV_MINOR_OSS_PCM: 125 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); 126 break; 127 case SNDRV_MINOR_OSS_MIDI: 128 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); 129 break; 130 case SNDRV_MINOR_OSS_MIDI1: 131 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); 132 break; 133 } 134 if (card) 135 carddev = card->dev; 136 register1 = register_sound_special_device(f_ops, minor, carddev); 137 if (register1 != minor) 138 goto __end; 139 if (track2 >= 0) { 140 register2 = register_sound_special_device(f_ops, track2, 141 carddev); 142 if (register2 != track2) 143 goto __end; 144 snd_oss_minors[track2] = preg; 145 } 146 up(&sound_oss_mutex); 147 return 0; 148 149 __end: 150 if (register2 >= 0) 151 unregister_sound_special(register2); 152 if (register1 >= 0) 153 unregister_sound_special(register1); 154 snd_oss_minors[minor] = NULL; 155 up(&sound_oss_mutex); 156 kfree(preg); 157 return -EBUSY; 158 } 159 160 int snd_unregister_oss_device(int type, struct snd_card *card, int dev) 161 { 162 int minor = snd_oss_kernel_minor(type, card, dev); 163 int cidx = SNDRV_MINOR_OSS_CARD(minor); 164 int track2 = -1; 165 struct snd_minor *mptr; 166 167 if (card && card->number >= 8) 168 return 0; 169 if (minor < 0) 170 return minor; 171 down(&sound_oss_mutex); 172 mptr = snd_oss_minors[minor]; 173 if (mptr == NULL) { 174 up(&sound_oss_mutex); 175 return -ENOENT; 176 } 177 unregister_sound_special(minor); 178 switch (SNDRV_MINOR_OSS_DEVICE(minor)) { 179 case SNDRV_MINOR_OSS_PCM: 180 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); 181 break; 182 case SNDRV_MINOR_OSS_MIDI: 183 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); 184 break; 185 case SNDRV_MINOR_OSS_MIDI1: 186 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); 187 break; 188 } 189 if (track2 >= 0) { 190 unregister_sound_special(track2); 191 snd_oss_minors[track2] = NULL; 192 } 193 snd_oss_minors[minor] = NULL; 194 up(&sound_oss_mutex); 195 kfree(mptr); 196 return 0; 197 } 198 199 /* 200 * INFO PART 201 */ 202 203 #ifdef CONFIG_PROC_FS 204 205 static struct snd_info_entry *snd_minor_info_oss_entry = NULL; 206 207 static const char *snd_oss_device_type_name(int type) 208 { 209 switch (type) { 210 case SNDRV_OSS_DEVICE_TYPE_MIXER: 211 return "mixer"; 212 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER: 213 case SNDRV_OSS_DEVICE_TYPE_MUSIC: 214 return "sequencer"; 215 case SNDRV_OSS_DEVICE_TYPE_PCM: 216 return "digital audio"; 217 case SNDRV_OSS_DEVICE_TYPE_MIDI: 218 return "raw midi"; 219 case SNDRV_OSS_DEVICE_TYPE_DMFM: 220 return "hardware dependent"; 221 default: 222 return "?"; 223 } 224 } 225 226 static void snd_minor_info_oss_read(struct snd_info_entry *entry, 227 struct snd_info_buffer *buffer) 228 { 229 int minor; 230 struct snd_minor *mptr; 231 232 down(&sound_oss_mutex); 233 for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) { 234 if (!(mptr = snd_oss_minors[minor])) 235 continue; 236 if (mptr->card >= 0) 237 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor, 238 mptr->card, mptr->device, 239 snd_oss_device_type_name(mptr->type)); 240 else 241 snd_iprintf(buffer, "%3i: : %s\n", minor, 242 snd_oss_device_type_name(mptr->type)); 243 } 244 up(&sound_oss_mutex); 245 } 246 247 248 int __init snd_minor_info_oss_init(void) 249 { 250 struct snd_info_entry *entry; 251 252 entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root); 253 if (entry) { 254 entry->c.text.read_size = PAGE_SIZE; 255 entry->c.text.read = snd_minor_info_oss_read; 256 if (snd_info_register(entry) < 0) { 257 snd_info_free_entry(entry); 258 entry = NULL; 259 } 260 } 261 snd_minor_info_oss_entry = entry; 262 return 0; 263 } 264 265 int __exit snd_minor_info_oss_done(void) 266 { 267 if (snd_minor_info_oss_entry) 268 snd_info_unregister(snd_minor_info_oss_entry); 269 return 0; 270 } 271 #endif /* CONFIG_PROC_FS */ 272 273 #endif /* CONFIG_SND_OSSEMUL */ 274