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