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 EXPORT_SYMBOL(snd_lookup_oss_minor_data); 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 if (snd_BUG_ON(!card || dev < 0 || dev > 1)) 67 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 if (snd_BUG_ON(!card || dev < 0 || dev > 1)) 78 return -EINVAL; 79 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM)); 80 break; 81 case SNDRV_OSS_DEVICE_TYPE_MIDI: 82 if (snd_BUG_ON(!card || dev < 0 || dev > 1)) 83 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 if (minor < 0 || minor >= SNDRV_OSS_MINORS) 96 return -EINVAL; 97 return minor; 98 } 99 100 int snd_register_oss_device(int type, struct snd_card *card, int dev, 101 const struct file_operations *f_ops, void *private_data) 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 >= SNDRV_MINOR_OSS_DEVICES) 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 preg->card_ptr = card; 124 mutex_lock(&sound_oss_mutex); 125 snd_oss_minors[minor] = preg; 126 minor_unit = SNDRV_MINOR_OSS_DEVICE(minor); 127 switch (minor_unit) { 128 case SNDRV_MINOR_OSS_PCM: 129 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); 130 break; 131 case SNDRV_MINOR_OSS_MIDI: 132 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); 133 break; 134 case SNDRV_MINOR_OSS_MIDI1: 135 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); 136 break; 137 } 138 register1 = register_sound_special_device(f_ops, minor, carddev); 139 if (register1 != minor) 140 goto __end; 141 if (track2 >= 0) { 142 register2 = register_sound_special_device(f_ops, track2, 143 carddev); 144 if (register2 != track2) 145 goto __end; 146 snd_oss_minors[track2] = preg; 147 } 148 mutex_unlock(&sound_oss_mutex); 149 return 0; 150 151 __end: 152 if (register2 >= 0) 153 unregister_sound_special(register2); 154 if (register1 >= 0) 155 unregister_sound_special(register1); 156 snd_oss_minors[minor] = NULL; 157 mutex_unlock(&sound_oss_mutex); 158 kfree(preg); 159 return -EBUSY; 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 >= SNDRV_MINOR_OSS_DEVICES) 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 EXPORT_SYMBOL(snd_unregister_oss_device); 202 203 /* 204 * INFO PART 205 */ 206 207 #ifdef CONFIG_SND_PROC_FS 208 static const char *snd_oss_device_type_name(int type) 209 { 210 switch (type) { 211 case SNDRV_OSS_DEVICE_TYPE_MIXER: 212 return "mixer"; 213 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER: 214 case SNDRV_OSS_DEVICE_TYPE_MUSIC: 215 return "sequencer"; 216 case SNDRV_OSS_DEVICE_TYPE_PCM: 217 return "digital audio"; 218 case SNDRV_OSS_DEVICE_TYPE_MIDI: 219 return "raw midi"; 220 case SNDRV_OSS_DEVICE_TYPE_DMFM: 221 return "hardware dependent"; 222 default: 223 return "?"; 224 } 225 } 226 227 static void snd_minor_info_oss_read(struct snd_info_entry *entry, 228 struct snd_info_buffer *buffer) 229 { 230 int minor; 231 struct snd_minor *mptr; 232 233 mutex_lock(&sound_oss_mutex); 234 for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) { 235 if (!(mptr = snd_oss_minors[minor])) 236 continue; 237 if (mptr->card >= 0) 238 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor, 239 mptr->card, mptr->device, 240 snd_oss_device_type_name(mptr->type)); 241 else 242 snd_iprintf(buffer, "%3i: : %s\n", minor, 243 snd_oss_device_type_name(mptr->type)); 244 } 245 mutex_unlock(&sound_oss_mutex); 246 } 247 248 249 int __init snd_minor_info_oss_init(void) 250 { 251 struct snd_info_entry *entry; 252 253 entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root); 254 if (!entry) 255 return -ENOMEM; 256 entry->c.text.read = snd_minor_info_oss_read; 257 return snd_info_register(entry); /* freed in error path */ 258 } 259 #endif /* CONFIG_SND_PROC_FS */ 260