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; 101 102 if (minor < 0) 103 return minor; 104 preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t), GFP_KERNEL); 105 if (preg == NULL) 106 return -ENOMEM; 107 *preg = *reg; 108 preg->number = minor; 109 preg->device = dev; 110 down(&sound_oss_mutex); 111 list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]); 112 minor_unit = SNDRV_MINOR_OSS_DEVICE(minor); 113 switch (minor_unit) { 114 case SNDRV_MINOR_OSS_PCM: 115 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); 116 break; 117 case SNDRV_MINOR_OSS_MIDI: 118 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); 119 break; 120 case SNDRV_MINOR_OSS_MIDI1: 121 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); 122 break; 123 } 124 register1 = register_sound_special(reg->f_ops, minor); 125 if (register1 != minor) 126 goto __end; 127 if (track2 >= 0) { 128 register2 = register_sound_special(reg->f_ops, track2); 129 if (register2 != track2) 130 goto __end; 131 } 132 up(&sound_oss_mutex); 133 return 0; 134 135 __end: 136 if (register2 >= 0) 137 unregister_sound_special(register2); 138 if (register1 >= 0) 139 unregister_sound_special(register1); 140 list_del(&preg->list); 141 up(&sound_oss_mutex); 142 kfree(preg); 143 return -EBUSY; 144 } 145 146 int snd_unregister_oss_device(int type, snd_card_t * card, int dev) 147 { 148 int minor = snd_oss_kernel_minor(type, card, dev); 149 int cidx = SNDRV_MINOR_OSS_CARD(minor); 150 int track2 = -1; 151 snd_minor_t *mptr; 152 153 if (minor < 0) 154 return minor; 155 down(&sound_oss_mutex); 156 mptr = snd_oss_minor_search(minor); 157 if (mptr == NULL) { 158 up(&sound_oss_mutex); 159 return -ENOENT; 160 } 161 unregister_sound_special(minor); 162 switch (SNDRV_MINOR_OSS_DEVICE(minor)) { 163 case SNDRV_MINOR_OSS_PCM: 164 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); 165 break; 166 case SNDRV_MINOR_OSS_MIDI: 167 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); 168 break; 169 case SNDRV_MINOR_OSS_MIDI1: 170 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); 171 break; 172 } 173 if (track2 >= 0) 174 unregister_sound_special(track2); 175 list_del(&mptr->list); 176 up(&sound_oss_mutex); 177 kfree(mptr); 178 return 0; 179 } 180 181 /* 182 * INFO PART 183 */ 184 185 #ifdef CONFIG_PROC_FS 186 187 static snd_info_entry_t *snd_minor_info_oss_entry = NULL; 188 189 static void snd_minor_info_oss_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) 190 { 191 int card, dev; 192 struct list_head *list; 193 snd_minor_t *mptr; 194 195 down(&sound_oss_mutex); 196 for (card = 0; card < SNDRV_CARDS; card++) { 197 list_for_each(list, &snd_oss_minors_hash[card]) { 198 mptr = list_entry(list, snd_minor_t, list); 199 dev = SNDRV_MINOR_OSS_DEVICE(mptr->number); 200 if (dev != SNDRV_MINOR_OSS_SNDSTAT && 201 dev != SNDRV_MINOR_OSS_SEQUENCER && 202 dev != SNDRV_MINOR_OSS_MUSIC) 203 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment); 204 else 205 snd_iprintf(buffer, "%3i: : %s\n", mptr->number, mptr->comment); 206 } 207 } 208 up(&sound_oss_mutex); 209 } 210 211 #endif /* CONFIG_PROC_FS */ 212 213 int __init snd_minor_info_oss_init(void) 214 { 215 #ifdef CONFIG_PROC_FS 216 snd_info_entry_t *entry; 217 218 entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root); 219 if (entry) { 220 entry->c.text.read_size = PAGE_SIZE; 221 entry->c.text.read = snd_minor_info_oss_read; 222 if (snd_info_register(entry) < 0) { 223 snd_info_free_entry(entry); 224 entry = NULL; 225 } 226 } 227 snd_minor_info_oss_entry = entry; 228 #endif 229 return 0; 230 } 231 232 int __exit snd_minor_info_oss_done(void) 233 { 234 #ifdef CONFIG_PROC_FS 235 if (snd_minor_info_oss_entry) 236 snd_info_unregister(snd_minor_info_oss_entry); 237 #endif 238 return 0; 239 } 240 241 int __init snd_oss_init_module(void) 242 { 243 int card; 244 245 for (card = 0; card < SNDRV_CARDS; card++) 246 INIT_LIST_HEAD(&snd_oss_minors_hash[card]); 247 return 0; 248 } 249 250 #endif /* CONFIG_SND_OSSEMUL */ 251