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_OS_MINORS 256 39 40 static struct list_head snd_oss_minors_hash[SNDRV_CARDS]; 41 42 static DECLARE_MUTEX(sound_oss_mutex); 43 44 static snd_minor_t *snd_oss_minor_search(int minor) 45 { 46 struct list_head *list; 47 snd_minor_t *mptr; 48 49 list_for_each(list, &snd_oss_minors_hash[SNDRV_MINOR_OSS_CARD(minor)]) { 50 mptr = list_entry(list, snd_minor_t, list); 51 if (mptr->number == minor) 52 return mptr; 53 } 54 return NULL; 55 } 56 57 static int snd_oss_kernel_minor(int type, snd_card_t * card, int dev) 58 { 59 int minor; 60 61 switch (type) { 62 case SNDRV_OSS_DEVICE_TYPE_MIXER: 63 snd_assert(card != NULL && dev <= 1, return -EINVAL); 64 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER)); 65 break; 66 case SNDRV_OSS_DEVICE_TYPE_SEQUENCER: 67 minor = SNDRV_MINOR_OSS_SEQUENCER; 68 break; 69 case SNDRV_OSS_DEVICE_TYPE_MUSIC: 70 minor = SNDRV_MINOR_OSS_MUSIC; 71 break; 72 case SNDRV_OSS_DEVICE_TYPE_PCM: 73 snd_assert(card != NULL && dev <= 1, return -EINVAL); 74 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM)); 75 break; 76 case SNDRV_OSS_DEVICE_TYPE_MIDI: 77 snd_assert(card != NULL && dev <= 1, return -EINVAL); 78 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI)); 79 break; 80 case SNDRV_OSS_DEVICE_TYPE_DMFM: 81 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM); 82 break; 83 case SNDRV_OSS_DEVICE_TYPE_SNDSTAT: 84 minor = SNDRV_MINOR_OSS_SNDSTAT; 85 break; 86 default: 87 return -EINVAL; 88 } 89 snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL); 90 return minor; 91 } 92 93 int snd_register_oss_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name) 94 { 95 int minor = snd_oss_kernel_minor(type, card, dev); 96 int minor_unit; 97 snd_minor_t *preg; 98 int cidx = SNDRV_MINOR_OSS_CARD(minor); 99 int track2 = -1; 100 int register1 = -1, register2 = -1; 101 struct device *carddev = NULL; 102 103 if (minor < 0) 104 return minor; 105 preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t), GFP_KERNEL); 106 if (preg == NULL) 107 return -ENOMEM; 108 *preg = *reg; 109 preg->number = minor; 110 preg->device = dev; 111 down(&sound_oss_mutex); 112 list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]); 113 minor_unit = SNDRV_MINOR_OSS_DEVICE(minor); 114 switch (minor_unit) { 115 case SNDRV_MINOR_OSS_PCM: 116 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); 117 break; 118 case SNDRV_MINOR_OSS_MIDI: 119 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); 120 break; 121 case SNDRV_MINOR_OSS_MIDI1: 122 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); 123 break; 124 } 125 if (card) 126 carddev = card->dev; 127 register1 = register_sound_special_device(reg->f_ops, minor, carddev); 128 if (register1 != minor) 129 goto __end; 130 if (track2 >= 0) { 131 register2 = register_sound_special_device(reg->f_ops, track2, carddev); 132 if (register2 != track2) 133 goto __end; 134 } 135 up(&sound_oss_mutex); 136 return 0; 137 138 __end: 139 if (register2 >= 0) 140 unregister_sound_special(register2); 141 if (register1 >= 0) 142 unregister_sound_special(register1); 143 list_del(&preg->list); 144 up(&sound_oss_mutex); 145 kfree(preg); 146 return -EBUSY; 147 } 148 149 int snd_unregister_oss_device(int type, snd_card_t * card, int dev) 150 { 151 int minor = snd_oss_kernel_minor(type, card, dev); 152 int cidx = SNDRV_MINOR_OSS_CARD(minor); 153 int track2 = -1; 154 snd_minor_t *mptr; 155 156 if (minor < 0) 157 return minor; 158 down(&sound_oss_mutex); 159 mptr = snd_oss_minor_search(minor); 160 if (mptr == NULL) { 161 up(&sound_oss_mutex); 162 return -ENOENT; 163 } 164 unregister_sound_special(minor); 165 switch (SNDRV_MINOR_OSS_DEVICE(minor)) { 166 case SNDRV_MINOR_OSS_PCM: 167 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); 168 break; 169 case SNDRV_MINOR_OSS_MIDI: 170 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); 171 break; 172 case SNDRV_MINOR_OSS_MIDI1: 173 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); 174 break; 175 } 176 if (track2 >= 0) 177 unregister_sound_special(track2); 178 list_del(&mptr->list); 179 up(&sound_oss_mutex); 180 kfree(mptr); 181 return 0; 182 } 183 184 /* 185 * INFO PART 186 */ 187 188 #ifdef CONFIG_PROC_FS 189 190 static snd_info_entry_t *snd_minor_info_oss_entry = NULL; 191 192 static void snd_minor_info_oss_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) 193 { 194 int card, dev; 195 struct list_head *list; 196 snd_minor_t *mptr; 197 198 down(&sound_oss_mutex); 199 for (card = 0; card < SNDRV_CARDS; card++) { 200 list_for_each(list, &snd_oss_minors_hash[card]) { 201 mptr = list_entry(list, snd_minor_t, list); 202 dev = SNDRV_MINOR_OSS_DEVICE(mptr->number); 203 if (dev != SNDRV_MINOR_OSS_SNDSTAT && 204 dev != SNDRV_MINOR_OSS_SEQUENCER && 205 dev != SNDRV_MINOR_OSS_MUSIC) 206 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment); 207 else 208 snd_iprintf(buffer, "%3i: : %s\n", mptr->number, mptr->comment); 209 } 210 } 211 up(&sound_oss_mutex); 212 } 213 214 #endif /* CONFIG_PROC_FS */ 215 216 int __init snd_minor_info_oss_init(void) 217 { 218 #ifdef CONFIG_PROC_FS 219 snd_info_entry_t *entry; 220 221 entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root); 222 if (entry) { 223 entry->c.text.read_size = PAGE_SIZE; 224 entry->c.text.read = snd_minor_info_oss_read; 225 if (snd_info_register(entry) < 0) { 226 snd_info_free_entry(entry); 227 entry = NULL; 228 } 229 } 230 snd_minor_info_oss_entry = entry; 231 #endif 232 return 0; 233 } 234 235 int __exit snd_minor_info_oss_done(void) 236 { 237 #ifdef CONFIG_PROC_FS 238 if (snd_minor_info_oss_entry) 239 snd_info_unregister(snd_minor_info_oss_entry); 240 #endif 241 return 0; 242 } 243 244 int __init snd_oss_init_module(void) 245 { 246 int card; 247 248 for (card = 0; card < SNDRV_CARDS; card++) 249 INIT_LIST_HEAD(&snd_oss_minors_hash[card]); 250 return 0; 251 } 252 253 #endif /* CONFIG_SND_OSSEMUL */ 254