| 1 | /* |
| 2 | * Routines for driver control interface |
| 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/threads.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/vmalloc.h> |
| 27 | #include <linux/time.h> |
| 28 | #include <sound/core.h> |
| 29 | #include <sound/minors.h> |
| 30 | #include <sound/info.h> |
| 31 | #include <sound/control.h> |
| 32 | |
| 33 | /* max number of user-defined controls */ |
| 34 | #define MAX_USER_CONTROLS 32 |
| 35 | #define MAX_CONTROL_COUNT 1028 |
| 36 | |
| 37 | struct snd_kctl_ioctl { |
| 38 | struct list_head list; /* list of all ioctls */ |
| 39 | snd_kctl_ioctl_func_t fioctl; |
| 40 | }; |
| 41 | |
| 42 | static DECLARE_RWSEM(snd_ioctl_rwsem); |
| 43 | static LIST_HEAD(snd_control_ioctls); |
| 44 | #ifdef CONFIG_COMPAT |
| 45 | static LIST_HEAD(snd_control_compat_ioctls); |
| 46 | #endif |
| 47 | |
| 48 | static int snd_ctl_open(struct inode *inode, struct file *file) |
| 49 | { |
| 50 | unsigned long flags; |
| 51 | struct snd_card *card; |
| 52 | struct snd_ctl_file *ctl; |
| 53 | int err; |
| 54 | |
| 55 | err = nonseekable_open(inode, file); |
| 56 | if (err < 0) |
| 57 | return err; |
| 58 | |
| 59 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
| 60 | if (!card) { |
| 61 | err = -ENODEV; |
| 62 | goto __error1; |
| 63 | } |
| 64 | err = snd_card_file_add(card, file); |
| 65 | if (err < 0) { |
| 66 | err = -ENODEV; |
| 67 | goto __error1; |
| 68 | } |
| 69 | if (!try_module_get(card->module)) { |
| 70 | err = -EFAULT; |
| 71 | goto __error2; |
| 72 | } |
| 73 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
| 74 | if (ctl == NULL) { |
| 75 | err = -ENOMEM; |
| 76 | goto __error; |
| 77 | } |
| 78 | INIT_LIST_HEAD(&ctl->events); |
| 79 | init_waitqueue_head(&ctl->change_sleep); |
| 80 | spin_lock_init(&ctl->read_lock); |
| 81 | ctl->card = card; |
| 82 | ctl->prefer_pcm_subdevice = -1; |
| 83 | ctl->prefer_rawmidi_subdevice = -1; |
| 84 | ctl->pid = get_pid(task_pid(current)); |
| 85 | file->private_data = ctl; |
| 86 | write_lock_irqsave(&card->ctl_files_rwlock, flags); |
| 87 | list_add_tail(&ctl->list, &card->ctl_files); |
| 88 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); |
| 89 | snd_card_unref(card); |
| 90 | return 0; |
| 91 | |
| 92 | __error: |
| 93 | module_put(card->module); |
| 94 | __error2: |
| 95 | snd_card_file_remove(card, file); |
| 96 | __error1: |
| 97 | if (card) |
| 98 | snd_card_unref(card); |
| 99 | return err; |
| 100 | } |
| 101 | |
| 102 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
| 103 | { |
| 104 | unsigned long flags; |
| 105 | struct snd_kctl_event *cread; |
| 106 | |
| 107 | spin_lock_irqsave(&ctl->read_lock, flags); |
| 108 | while (!list_empty(&ctl->events)) { |
| 109 | cread = snd_kctl_event(ctl->events.next); |
| 110 | list_del(&cread->list); |
| 111 | kfree(cread); |
| 112 | } |
| 113 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
| 114 | } |
| 115 | |
| 116 | static int snd_ctl_release(struct inode *inode, struct file *file) |
| 117 | { |
| 118 | unsigned long flags; |
| 119 | struct snd_card *card; |
| 120 | struct snd_ctl_file *ctl; |
| 121 | struct snd_kcontrol *control; |
| 122 | unsigned int idx; |
| 123 | |
| 124 | ctl = file->private_data; |
| 125 | file->private_data = NULL; |
| 126 | card = ctl->card; |
| 127 | write_lock_irqsave(&card->ctl_files_rwlock, flags); |
| 128 | list_del(&ctl->list); |
| 129 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); |
| 130 | down_write(&card->controls_rwsem); |
| 131 | list_for_each_entry(control, &card->controls, list) |
| 132 | for (idx = 0; idx < control->count; idx++) |
| 133 | if (control->vd[idx].owner == ctl) |
| 134 | control->vd[idx].owner = NULL; |
| 135 | up_write(&card->controls_rwsem); |
| 136 | snd_ctl_empty_read_queue(ctl); |
| 137 | put_pid(ctl->pid); |
| 138 | kfree(ctl); |
| 139 | module_put(card->module); |
| 140 | snd_card_file_remove(card, file); |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
| 145 | struct snd_ctl_elem_id *id) |
| 146 | { |
| 147 | unsigned long flags; |
| 148 | struct snd_ctl_file *ctl; |
| 149 | struct snd_kctl_event *ev; |
| 150 | |
| 151 | if (snd_BUG_ON(!card || !id)) |
| 152 | return; |
| 153 | if (card->shutdown) |
| 154 | return; |
| 155 | read_lock(&card->ctl_files_rwlock); |
| 156 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
| 157 | card->mixer_oss_change_count++; |
| 158 | #endif |
| 159 | list_for_each_entry(ctl, &card->ctl_files, list) { |
| 160 | if (!ctl->subscribed) |
| 161 | continue; |
| 162 | spin_lock_irqsave(&ctl->read_lock, flags); |
| 163 | list_for_each_entry(ev, &ctl->events, list) { |
| 164 | if (ev->id.numid == id->numid) { |
| 165 | ev->mask |= mask; |
| 166 | goto _found; |
| 167 | } |
| 168 | } |
| 169 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
| 170 | if (ev) { |
| 171 | ev->id = *id; |
| 172 | ev->mask = mask; |
| 173 | list_add_tail(&ev->list, &ctl->events); |
| 174 | } else { |
| 175 | snd_printk(KERN_ERR "No memory available to allocate event\n"); |
| 176 | } |
| 177 | _found: |
| 178 | wake_up(&ctl->change_sleep); |
| 179 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
| 180 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); |
| 181 | } |
| 182 | read_unlock(&card->ctl_files_rwlock); |
| 183 | } |
| 184 | |
| 185 | EXPORT_SYMBOL(snd_ctl_notify); |
| 186 | |
| 187 | /** |
| 188 | * snd_ctl_new - create a control instance from the template |
| 189 | * @control: the control template |
| 190 | * @access: the default control access |
| 191 | * |
| 192 | * Allocates a new struct snd_kcontrol instance and copies the given template |
| 193 | * to the new instance. It does not copy volatile data (access). |
| 194 | * |
| 195 | * Return: The pointer of the new instance, or %NULL on failure. |
| 196 | */ |
| 197 | static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, |
| 198 | unsigned int access) |
| 199 | { |
| 200 | struct snd_kcontrol *kctl; |
| 201 | unsigned int idx; |
| 202 | |
| 203 | if (snd_BUG_ON(!control || !control->count)) |
| 204 | return NULL; |
| 205 | |
| 206 | if (control->count > MAX_CONTROL_COUNT) |
| 207 | return NULL; |
| 208 | |
| 209 | kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); |
| 210 | if (kctl == NULL) { |
| 211 | snd_printk(KERN_ERR "Cannot allocate control instance\n"); |
| 212 | return NULL; |
| 213 | } |
| 214 | *kctl = *control; |
| 215 | for (idx = 0; idx < kctl->count; idx++) |
| 216 | kctl->vd[idx].access = access; |
| 217 | return kctl; |
| 218 | } |
| 219 | |
| 220 | /** |
| 221 | * snd_ctl_new1 - create a control instance from the template |
| 222 | * @ncontrol: the initialization record |
| 223 | * @private_data: the private data to set |
| 224 | * |
| 225 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
| 226 | * template. When the access field of ncontrol is 0, it's assumed as |
| 227 | * READWRITE access. When the count field is 0, it's assumes as one. |
| 228 | * |
| 229 | * Return: The pointer of the newly generated instance, or %NULL on failure. |
| 230 | */ |
| 231 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
| 232 | void *private_data) |
| 233 | { |
| 234 | struct snd_kcontrol kctl; |
| 235 | unsigned int access; |
| 236 | |
| 237 | if (snd_BUG_ON(!ncontrol || !ncontrol->info)) |
| 238 | return NULL; |
| 239 | memset(&kctl, 0, sizeof(kctl)); |
| 240 | kctl.id.iface = ncontrol->iface; |
| 241 | kctl.id.device = ncontrol->device; |
| 242 | kctl.id.subdevice = ncontrol->subdevice; |
| 243 | if (ncontrol->name) { |
| 244 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); |
| 245 | if (strcmp(ncontrol->name, kctl.id.name) != 0) |
| 246 | snd_printk(KERN_WARNING |
| 247 | "Control name '%s' truncated to '%s'\n", |
| 248 | ncontrol->name, kctl.id.name); |
| 249 | } |
| 250 | kctl.id.index = ncontrol->index; |
| 251 | kctl.count = ncontrol->count ? ncontrol->count : 1; |
| 252 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : |
| 253 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
| 254 | SNDRV_CTL_ELEM_ACCESS_VOLATILE| |
| 255 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
| 256 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE| |
| 257 | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND| |
| 258 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)); |
| 259 | kctl.info = ncontrol->info; |
| 260 | kctl.get = ncontrol->get; |
| 261 | kctl.put = ncontrol->put; |
| 262 | kctl.tlv.p = ncontrol->tlv.p; |
| 263 | kctl.private_value = ncontrol->private_value; |
| 264 | kctl.private_data = private_data; |
| 265 | return snd_ctl_new(&kctl, access); |
| 266 | } |
| 267 | |
| 268 | EXPORT_SYMBOL(snd_ctl_new1); |
| 269 | |
| 270 | /** |
| 271 | * snd_ctl_free_one - release the control instance |
| 272 | * @kcontrol: the control instance |
| 273 | * |
| 274 | * Releases the control instance created via snd_ctl_new() |
| 275 | * or snd_ctl_new1(). |
| 276 | * Don't call this after the control was added to the card. |
| 277 | */ |
| 278 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
| 279 | { |
| 280 | if (kcontrol) { |
| 281 | if (kcontrol->private_free) |
| 282 | kcontrol->private_free(kcontrol); |
| 283 | kfree(kcontrol); |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | EXPORT_SYMBOL(snd_ctl_free_one); |
| 288 | |
| 289 | static bool snd_ctl_remove_numid_conflict(struct snd_card *card, |
| 290 | unsigned int count) |
| 291 | { |
| 292 | struct snd_kcontrol *kctl; |
| 293 | |
| 294 | /* Make sure that the ids assigned to the control do not wrap around */ |
| 295 | if (card->last_numid >= UINT_MAX - count) |
| 296 | card->last_numid = 0; |
| 297 | |
| 298 | list_for_each_entry(kctl, &card->controls, list) { |
| 299 | if (kctl->id.numid < card->last_numid + 1 + count && |
| 300 | kctl->id.numid + kctl->count > card->last_numid + 1) { |
| 301 | card->last_numid = kctl->id.numid + kctl->count - 1; |
| 302 | return true; |
| 303 | } |
| 304 | } |
| 305 | return false; |
| 306 | } |
| 307 | |
| 308 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
| 309 | { |
| 310 | unsigned int iter = 100000; |
| 311 | |
| 312 | while (snd_ctl_remove_numid_conflict(card, count)) { |
| 313 | if (--iter == 0) { |
| 314 | /* this situation is very unlikely */ |
| 315 | snd_printk(KERN_ERR "unable to allocate new control numid\n"); |
| 316 | return -ENOMEM; |
| 317 | } |
| 318 | } |
| 319 | return 0; |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * snd_ctl_add - add the control instance to the card |
| 324 | * @card: the card instance |
| 325 | * @kcontrol: the control instance to add |
| 326 | * |
| 327 | * Adds the control instance created via snd_ctl_new() or |
| 328 | * snd_ctl_new1() to the given card. Assigns also an unique |
| 329 | * numid used for fast search. |
| 330 | * |
| 331 | * It frees automatically the control which cannot be added. |
| 332 | * |
| 333 | * Return: Zero if successful, or a negative error code on failure. |
| 334 | * |
| 335 | */ |
| 336 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
| 337 | { |
| 338 | struct snd_ctl_elem_id id; |
| 339 | unsigned int idx; |
| 340 | unsigned int count; |
| 341 | int err = -EINVAL; |
| 342 | |
| 343 | if (! kcontrol) |
| 344 | return err; |
| 345 | if (snd_BUG_ON(!card || !kcontrol->info)) |
| 346 | goto error; |
| 347 | id = kcontrol->id; |
| 348 | if (id.index > UINT_MAX - kcontrol->count) |
| 349 | goto error; |
| 350 | |
| 351 | down_write(&card->controls_rwsem); |
| 352 | if (snd_ctl_find_id(card, &id)) { |
| 353 | up_write(&card->controls_rwsem); |
| 354 | snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n", |
| 355 | id.iface, |
| 356 | id.device, |
| 357 | id.subdevice, |
| 358 | id.name, |
| 359 | id.index); |
| 360 | err = -EBUSY; |
| 361 | goto error; |
| 362 | } |
| 363 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { |
| 364 | up_write(&card->controls_rwsem); |
| 365 | err = -ENOMEM; |
| 366 | goto error; |
| 367 | } |
| 368 | list_add_tail(&kcontrol->list, &card->controls); |
| 369 | card->controls_count += kcontrol->count; |
| 370 | kcontrol->id.numid = card->last_numid + 1; |
| 371 | card->last_numid += kcontrol->count; |
| 372 | count = kcontrol->count; |
| 373 | up_write(&card->controls_rwsem); |
| 374 | for (idx = 0; idx < count; idx++, id.index++, id.numid++) |
| 375 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); |
| 376 | return 0; |
| 377 | |
| 378 | error: |
| 379 | snd_ctl_free_one(kcontrol); |
| 380 | return err; |
| 381 | } |
| 382 | |
| 383 | EXPORT_SYMBOL(snd_ctl_add); |
| 384 | |
| 385 | /** |
| 386 | * snd_ctl_replace - replace the control instance of the card |
| 387 | * @card: the card instance |
| 388 | * @kcontrol: the control instance to replace |
| 389 | * @add_on_replace: add the control if not already added |
| 390 | * |
| 391 | * Replaces the given control. If the given control does not exist |
| 392 | * and the add_on_replace flag is set, the control is added. If the |
| 393 | * control exists, it is destroyed first. |
| 394 | * |
| 395 | * It frees automatically the control which cannot be added or replaced. |
| 396 | * |
| 397 | * Return: Zero if successful, or a negative error code on failure. |
| 398 | */ |
| 399 | int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, |
| 400 | bool add_on_replace) |
| 401 | { |
| 402 | struct snd_ctl_elem_id id; |
| 403 | unsigned int count; |
| 404 | unsigned int idx; |
| 405 | struct snd_kcontrol *old; |
| 406 | int ret; |
| 407 | |
| 408 | if (!kcontrol) |
| 409 | return -EINVAL; |
| 410 | if (snd_BUG_ON(!card || !kcontrol->info)) { |
| 411 | ret = -EINVAL; |
| 412 | goto error; |
| 413 | } |
| 414 | id = kcontrol->id; |
| 415 | down_write(&card->controls_rwsem); |
| 416 | old = snd_ctl_find_id(card, &id); |
| 417 | if (!old) { |
| 418 | if (add_on_replace) |
| 419 | goto add; |
| 420 | up_write(&card->controls_rwsem); |
| 421 | ret = -EINVAL; |
| 422 | goto error; |
| 423 | } |
| 424 | ret = snd_ctl_remove(card, old); |
| 425 | if (ret < 0) { |
| 426 | up_write(&card->controls_rwsem); |
| 427 | goto error; |
| 428 | } |
| 429 | add: |
| 430 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { |
| 431 | up_write(&card->controls_rwsem); |
| 432 | ret = -ENOMEM; |
| 433 | goto error; |
| 434 | } |
| 435 | list_add_tail(&kcontrol->list, &card->controls); |
| 436 | card->controls_count += kcontrol->count; |
| 437 | kcontrol->id.numid = card->last_numid + 1; |
| 438 | card->last_numid += kcontrol->count; |
| 439 | count = kcontrol->count; |
| 440 | up_write(&card->controls_rwsem); |
| 441 | for (idx = 0; idx < count; idx++, id.index++, id.numid++) |
| 442 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); |
| 443 | return 0; |
| 444 | |
| 445 | error: |
| 446 | snd_ctl_free_one(kcontrol); |
| 447 | return ret; |
| 448 | } |
| 449 | EXPORT_SYMBOL(snd_ctl_replace); |
| 450 | |
| 451 | /** |
| 452 | * snd_ctl_remove - remove the control from the card and release it |
| 453 | * @card: the card instance |
| 454 | * @kcontrol: the control instance to remove |
| 455 | * |
| 456 | * Removes the control from the card and then releases the instance. |
| 457 | * You don't need to call snd_ctl_free_one(). You must be in |
| 458 | * the write lock - down_write(&card->controls_rwsem). |
| 459 | * |
| 460 | * Return: 0 if successful, or a negative error code on failure. |
| 461 | */ |
| 462 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
| 463 | { |
| 464 | struct snd_ctl_elem_id id; |
| 465 | unsigned int idx; |
| 466 | |
| 467 | if (snd_BUG_ON(!card || !kcontrol)) |
| 468 | return -EINVAL; |
| 469 | list_del(&kcontrol->list); |
| 470 | card->controls_count -= kcontrol->count; |
| 471 | id = kcontrol->id; |
| 472 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) |
| 473 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); |
| 474 | snd_ctl_free_one(kcontrol); |
| 475 | return 0; |
| 476 | } |
| 477 | |
| 478 | EXPORT_SYMBOL(snd_ctl_remove); |
| 479 | |
| 480 | /** |
| 481 | * snd_ctl_remove_id - remove the control of the given id and release it |
| 482 | * @card: the card instance |
| 483 | * @id: the control id to remove |
| 484 | * |
| 485 | * Finds the control instance with the given id, removes it from the |
| 486 | * card list and releases it. |
| 487 | * |
| 488 | * Return: 0 if successful, or a negative error code on failure. |
| 489 | */ |
| 490 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
| 491 | { |
| 492 | struct snd_kcontrol *kctl; |
| 493 | int ret; |
| 494 | |
| 495 | down_write(&card->controls_rwsem); |
| 496 | kctl = snd_ctl_find_id(card, id); |
| 497 | if (kctl == NULL) { |
| 498 | up_write(&card->controls_rwsem); |
| 499 | return -ENOENT; |
| 500 | } |
| 501 | ret = snd_ctl_remove(card, kctl); |
| 502 | up_write(&card->controls_rwsem); |
| 503 | return ret; |
| 504 | } |
| 505 | |
| 506 | EXPORT_SYMBOL(snd_ctl_remove_id); |
| 507 | |
| 508 | /** |
| 509 | * snd_ctl_remove_user_ctl - remove and release the unlocked user control |
| 510 | * @file: active control handle |
| 511 | * @id: the control id to remove |
| 512 | * |
| 513 | * Finds the control instance with the given id, removes it from the |
| 514 | * card list and releases it. |
| 515 | * |
| 516 | * Return: 0 if successful, or a negative error code on failure. |
| 517 | */ |
| 518 | static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, |
| 519 | struct snd_ctl_elem_id *id) |
| 520 | { |
| 521 | struct snd_card *card = file->card; |
| 522 | struct snd_kcontrol *kctl; |
| 523 | int idx, ret; |
| 524 | |
| 525 | down_write(&card->controls_rwsem); |
| 526 | kctl = snd_ctl_find_id(card, id); |
| 527 | if (kctl == NULL) { |
| 528 | ret = -ENOENT; |
| 529 | goto error; |
| 530 | } |
| 531 | if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { |
| 532 | ret = -EINVAL; |
| 533 | goto error; |
| 534 | } |
| 535 | for (idx = 0; idx < kctl->count; idx++) |
| 536 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { |
| 537 | ret = -EBUSY; |
| 538 | goto error; |
| 539 | } |
| 540 | ret = snd_ctl_remove(card, kctl); |
| 541 | if (ret < 0) |
| 542 | goto error; |
| 543 | card->user_ctl_count--; |
| 544 | error: |
| 545 | up_write(&card->controls_rwsem); |
| 546 | return ret; |
| 547 | } |
| 548 | |
| 549 | /** |
| 550 | * snd_ctl_activate_id - activate/inactivate the control of the given id |
| 551 | * @card: the card instance |
| 552 | * @id: the control id to activate/inactivate |
| 553 | * @active: non-zero to activate |
| 554 | * |
| 555 | * Finds the control instance with the given id, and activate or |
| 556 | * inactivate the control together with notification, if changed. |
| 557 | * |
| 558 | * Return: 0 if unchanged, 1 if changed, or a negative error code on failure. |
| 559 | */ |
| 560 | int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id, |
| 561 | int active) |
| 562 | { |
| 563 | struct snd_kcontrol *kctl; |
| 564 | struct snd_kcontrol_volatile *vd; |
| 565 | unsigned int index_offset; |
| 566 | int ret; |
| 567 | |
| 568 | down_write(&card->controls_rwsem); |
| 569 | kctl = snd_ctl_find_id(card, id); |
| 570 | if (kctl == NULL) { |
| 571 | ret = -ENOENT; |
| 572 | goto unlock; |
| 573 | } |
| 574 | index_offset = snd_ctl_get_ioff(kctl, &kctl->id); |
| 575 | vd = &kctl->vd[index_offset]; |
| 576 | ret = 0; |
| 577 | if (active) { |
| 578 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)) |
| 579 | goto unlock; |
| 580 | vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; |
| 581 | } else { |
| 582 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE) |
| 583 | goto unlock; |
| 584 | vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE; |
| 585 | } |
| 586 | ret = 1; |
| 587 | unlock: |
| 588 | up_write(&card->controls_rwsem); |
| 589 | if (ret > 0) |
| 590 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id); |
| 591 | return ret; |
| 592 | } |
| 593 | EXPORT_SYMBOL_GPL(snd_ctl_activate_id); |
| 594 | |
| 595 | /** |
| 596 | * snd_ctl_rename_id - replace the id of a control on the card |
| 597 | * @card: the card instance |
| 598 | * @src_id: the old id |
| 599 | * @dst_id: the new id |
| 600 | * |
| 601 | * Finds the control with the old id from the card, and replaces the |
| 602 | * id with the new one. |
| 603 | * |
| 604 | * Return: Zero if successful, or a negative error code on failure. |
| 605 | */ |
| 606 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
| 607 | struct snd_ctl_elem_id *dst_id) |
| 608 | { |
| 609 | struct snd_kcontrol *kctl; |
| 610 | |
| 611 | down_write(&card->controls_rwsem); |
| 612 | kctl = snd_ctl_find_id(card, src_id); |
| 613 | if (kctl == NULL) { |
| 614 | up_write(&card->controls_rwsem); |
| 615 | return -ENOENT; |
| 616 | } |
| 617 | kctl->id = *dst_id; |
| 618 | kctl->id.numid = card->last_numid + 1; |
| 619 | card->last_numid += kctl->count; |
| 620 | up_write(&card->controls_rwsem); |
| 621 | return 0; |
| 622 | } |
| 623 | |
| 624 | EXPORT_SYMBOL(snd_ctl_rename_id); |
| 625 | |
| 626 | /** |
| 627 | * snd_ctl_find_numid - find the control instance with the given number-id |
| 628 | * @card: the card instance |
| 629 | * @numid: the number-id to search |
| 630 | * |
| 631 | * Finds the control instance with the given number-id from the card. |
| 632 | * |
| 633 | * The caller must down card->controls_rwsem before calling this function |
| 634 | * (if the race condition can happen). |
| 635 | * |
| 636 | * Return: The pointer of the instance if found, or %NULL if not. |
| 637 | * |
| 638 | */ |
| 639 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
| 640 | { |
| 641 | struct snd_kcontrol *kctl; |
| 642 | |
| 643 | if (snd_BUG_ON(!card || !numid)) |
| 644 | return NULL; |
| 645 | list_for_each_entry(kctl, &card->controls, list) { |
| 646 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
| 647 | return kctl; |
| 648 | } |
| 649 | return NULL; |
| 650 | } |
| 651 | |
| 652 | EXPORT_SYMBOL(snd_ctl_find_numid); |
| 653 | |
| 654 | /** |
| 655 | * snd_ctl_find_id - find the control instance with the given id |
| 656 | * @card: the card instance |
| 657 | * @id: the id to search |
| 658 | * |
| 659 | * Finds the control instance with the given id from the card. |
| 660 | * |
| 661 | * The caller must down card->controls_rwsem before calling this function |
| 662 | * (if the race condition can happen). |
| 663 | * |
| 664 | * Return: The pointer of the instance if found, or %NULL if not. |
| 665 | * |
| 666 | */ |
| 667 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
| 668 | struct snd_ctl_elem_id *id) |
| 669 | { |
| 670 | struct snd_kcontrol *kctl; |
| 671 | |
| 672 | if (snd_BUG_ON(!card || !id)) |
| 673 | return NULL; |
| 674 | if (id->numid != 0) |
| 675 | return snd_ctl_find_numid(card, id->numid); |
| 676 | list_for_each_entry(kctl, &card->controls, list) { |
| 677 | if (kctl->id.iface != id->iface) |
| 678 | continue; |
| 679 | if (kctl->id.device != id->device) |
| 680 | continue; |
| 681 | if (kctl->id.subdevice != id->subdevice) |
| 682 | continue; |
| 683 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) |
| 684 | continue; |
| 685 | if (kctl->id.index > id->index) |
| 686 | continue; |
| 687 | if (kctl->id.index + kctl->count <= id->index) |
| 688 | continue; |
| 689 | return kctl; |
| 690 | } |
| 691 | return NULL; |
| 692 | } |
| 693 | |
| 694 | EXPORT_SYMBOL(snd_ctl_find_id); |
| 695 | |
| 696 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
| 697 | unsigned int cmd, void __user *arg) |
| 698 | { |
| 699 | struct snd_ctl_card_info *info; |
| 700 | |
| 701 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
| 702 | if (! info) |
| 703 | return -ENOMEM; |
| 704 | down_read(&snd_ioctl_rwsem); |
| 705 | info->card = card->number; |
| 706 | strlcpy(info->id, card->id, sizeof(info->id)); |
| 707 | strlcpy(info->driver, card->driver, sizeof(info->driver)); |
| 708 | strlcpy(info->name, card->shortname, sizeof(info->name)); |
| 709 | strlcpy(info->longname, card->longname, sizeof(info->longname)); |
| 710 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); |
| 711 | strlcpy(info->components, card->components, sizeof(info->components)); |
| 712 | up_read(&snd_ioctl_rwsem); |
| 713 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
| 714 | kfree(info); |
| 715 | return -EFAULT; |
| 716 | } |
| 717 | kfree(info); |
| 718 | return 0; |
| 719 | } |
| 720 | |
| 721 | static int snd_ctl_elem_list(struct snd_card *card, |
| 722 | struct snd_ctl_elem_list __user *_list) |
| 723 | { |
| 724 | struct list_head *plist; |
| 725 | struct snd_ctl_elem_list list; |
| 726 | struct snd_kcontrol *kctl; |
| 727 | struct snd_ctl_elem_id *dst, *id; |
| 728 | unsigned int offset, space, jidx; |
| 729 | |
| 730 | if (copy_from_user(&list, _list, sizeof(list))) |
| 731 | return -EFAULT; |
| 732 | offset = list.offset; |
| 733 | space = list.space; |
| 734 | /* try limit maximum space */ |
| 735 | if (space > 16384) |
| 736 | return -ENOMEM; |
| 737 | if (space > 0) { |
| 738 | /* allocate temporary buffer for atomic operation */ |
| 739 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
| 740 | if (dst == NULL) |
| 741 | return -ENOMEM; |
| 742 | down_read(&card->controls_rwsem); |
| 743 | list.count = card->controls_count; |
| 744 | plist = card->controls.next; |
| 745 | while (plist != &card->controls) { |
| 746 | if (offset == 0) |
| 747 | break; |
| 748 | kctl = snd_kcontrol(plist); |
| 749 | if (offset < kctl->count) |
| 750 | break; |
| 751 | offset -= kctl->count; |
| 752 | plist = plist->next; |
| 753 | } |
| 754 | list.used = 0; |
| 755 | id = dst; |
| 756 | while (space > 0 && plist != &card->controls) { |
| 757 | kctl = snd_kcontrol(plist); |
| 758 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { |
| 759 | snd_ctl_build_ioff(id, kctl, jidx); |
| 760 | id++; |
| 761 | space--; |
| 762 | list.used++; |
| 763 | } |
| 764 | plist = plist->next; |
| 765 | offset = 0; |
| 766 | } |
| 767 | up_read(&card->controls_rwsem); |
| 768 | if (list.used > 0 && |
| 769 | copy_to_user(list.pids, dst, |
| 770 | list.used * sizeof(struct snd_ctl_elem_id))) { |
| 771 | vfree(dst); |
| 772 | return -EFAULT; |
| 773 | } |
| 774 | vfree(dst); |
| 775 | } else { |
| 776 | down_read(&card->controls_rwsem); |
| 777 | list.count = card->controls_count; |
| 778 | up_read(&card->controls_rwsem); |
| 779 | } |
| 780 | if (copy_to_user(_list, &list, sizeof(list))) |
| 781 | return -EFAULT; |
| 782 | return 0; |
| 783 | } |
| 784 | |
| 785 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
| 786 | struct snd_ctl_elem_info *info) |
| 787 | { |
| 788 | struct snd_card *card = ctl->card; |
| 789 | struct snd_kcontrol *kctl; |
| 790 | struct snd_kcontrol_volatile *vd; |
| 791 | unsigned int index_offset; |
| 792 | int result; |
| 793 | |
| 794 | down_read(&card->controls_rwsem); |
| 795 | kctl = snd_ctl_find_id(card, &info->id); |
| 796 | if (kctl == NULL) { |
| 797 | up_read(&card->controls_rwsem); |
| 798 | return -ENOENT; |
| 799 | } |
| 800 | #ifdef CONFIG_SND_DEBUG |
| 801 | info->access = 0; |
| 802 | #endif |
| 803 | result = kctl->info(kctl, info); |
| 804 | if (result >= 0) { |
| 805 | snd_BUG_ON(info->access); |
| 806 | index_offset = snd_ctl_get_ioff(kctl, &info->id); |
| 807 | vd = &kctl->vd[index_offset]; |
| 808 | snd_ctl_build_ioff(&info->id, kctl, index_offset); |
| 809 | info->access = vd->access; |
| 810 | if (vd->owner) { |
| 811 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; |
| 812 | if (vd->owner == ctl) |
| 813 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; |
| 814 | info->owner = pid_vnr(vd->owner->pid); |
| 815 | } else { |
| 816 | info->owner = -1; |
| 817 | } |
| 818 | } |
| 819 | up_read(&card->controls_rwsem); |
| 820 | return result; |
| 821 | } |
| 822 | |
| 823 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
| 824 | struct snd_ctl_elem_info __user *_info) |
| 825 | { |
| 826 | struct snd_ctl_elem_info info; |
| 827 | int result; |
| 828 | |
| 829 | if (copy_from_user(&info, _info, sizeof(info))) |
| 830 | return -EFAULT; |
| 831 | snd_power_lock(ctl->card); |
| 832 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
| 833 | if (result >= 0) |
| 834 | result = snd_ctl_elem_info(ctl, &info); |
| 835 | snd_power_unlock(ctl->card); |
| 836 | if (result >= 0) |
| 837 | if (copy_to_user(_info, &info, sizeof(info))) |
| 838 | return -EFAULT; |
| 839 | return result; |
| 840 | } |
| 841 | |
| 842 | static int snd_ctl_elem_read(struct snd_card *card, |
| 843 | struct snd_ctl_elem_value *control) |
| 844 | { |
| 845 | struct snd_kcontrol *kctl; |
| 846 | struct snd_kcontrol_volatile *vd; |
| 847 | unsigned int index_offset; |
| 848 | int result; |
| 849 | |
| 850 | down_read(&card->controls_rwsem); |
| 851 | kctl = snd_ctl_find_id(card, &control->id); |
| 852 | if (kctl == NULL) { |
| 853 | result = -ENOENT; |
| 854 | } else { |
| 855 | index_offset = snd_ctl_get_ioff(kctl, &control->id); |
| 856 | vd = &kctl->vd[index_offset]; |
| 857 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && |
| 858 | kctl->get != NULL) { |
| 859 | snd_ctl_build_ioff(&control->id, kctl, index_offset); |
| 860 | result = kctl->get(kctl, control); |
| 861 | } else |
| 862 | result = -EPERM; |
| 863 | } |
| 864 | up_read(&card->controls_rwsem); |
| 865 | return result; |
| 866 | } |
| 867 | |
| 868 | static int snd_ctl_elem_read_user(struct snd_card *card, |
| 869 | struct snd_ctl_elem_value __user *_control) |
| 870 | { |
| 871 | struct snd_ctl_elem_value *control; |
| 872 | int result; |
| 873 | |
| 874 | control = memdup_user(_control, sizeof(*control)); |
| 875 | if (IS_ERR(control)) |
| 876 | return PTR_ERR(control); |
| 877 | |
| 878 | snd_power_lock(card); |
| 879 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
| 880 | if (result >= 0) |
| 881 | result = snd_ctl_elem_read(card, control); |
| 882 | snd_power_unlock(card); |
| 883 | if (result >= 0) |
| 884 | if (copy_to_user(_control, control, sizeof(*control))) |
| 885 | result = -EFAULT; |
| 886 | kfree(control); |
| 887 | return result; |
| 888 | } |
| 889 | |
| 890 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
| 891 | struct snd_ctl_elem_value *control) |
| 892 | { |
| 893 | struct snd_kcontrol *kctl; |
| 894 | struct snd_kcontrol_volatile *vd; |
| 895 | unsigned int index_offset; |
| 896 | int result; |
| 897 | |
| 898 | down_read(&card->controls_rwsem); |
| 899 | kctl = snd_ctl_find_id(card, &control->id); |
| 900 | if (kctl == NULL) { |
| 901 | result = -ENOENT; |
| 902 | } else { |
| 903 | index_offset = snd_ctl_get_ioff(kctl, &control->id); |
| 904 | vd = &kctl->vd[index_offset]; |
| 905 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || |
| 906 | kctl->put == NULL || |
| 907 | (file && vd->owner && vd->owner != file)) { |
| 908 | result = -EPERM; |
| 909 | } else { |
| 910 | snd_ctl_build_ioff(&control->id, kctl, index_offset); |
| 911 | result = kctl->put(kctl, control); |
| 912 | } |
| 913 | if (result > 0) { |
| 914 | struct snd_ctl_elem_id id = control->id; |
| 915 | up_read(&card->controls_rwsem); |
| 916 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &id); |
| 917 | return 0; |
| 918 | } |
| 919 | } |
| 920 | up_read(&card->controls_rwsem); |
| 921 | return result; |
| 922 | } |
| 923 | |
| 924 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
| 925 | struct snd_ctl_elem_value __user *_control) |
| 926 | { |
| 927 | struct snd_ctl_elem_value *control; |
| 928 | struct snd_card *card; |
| 929 | int result; |
| 930 | |
| 931 | control = memdup_user(_control, sizeof(*control)); |
| 932 | if (IS_ERR(control)) |
| 933 | return PTR_ERR(control); |
| 934 | |
| 935 | card = file->card; |
| 936 | snd_power_lock(card); |
| 937 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
| 938 | if (result >= 0) |
| 939 | result = snd_ctl_elem_write(card, file, control); |
| 940 | snd_power_unlock(card); |
| 941 | if (result >= 0) |
| 942 | if (copy_to_user(_control, control, sizeof(*control))) |
| 943 | result = -EFAULT; |
| 944 | kfree(control); |
| 945 | return result; |
| 946 | } |
| 947 | |
| 948 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
| 949 | struct snd_ctl_elem_id __user *_id) |
| 950 | { |
| 951 | struct snd_card *card = file->card; |
| 952 | struct snd_ctl_elem_id id; |
| 953 | struct snd_kcontrol *kctl; |
| 954 | struct snd_kcontrol_volatile *vd; |
| 955 | int result; |
| 956 | |
| 957 | if (copy_from_user(&id, _id, sizeof(id))) |
| 958 | return -EFAULT; |
| 959 | down_write(&card->controls_rwsem); |
| 960 | kctl = snd_ctl_find_id(card, &id); |
| 961 | if (kctl == NULL) { |
| 962 | result = -ENOENT; |
| 963 | } else { |
| 964 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; |
| 965 | if (vd->owner != NULL) |
| 966 | result = -EBUSY; |
| 967 | else { |
| 968 | vd->owner = file; |
| 969 | result = 0; |
| 970 | } |
| 971 | } |
| 972 | up_write(&card->controls_rwsem); |
| 973 | return result; |
| 974 | } |
| 975 | |
| 976 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
| 977 | struct snd_ctl_elem_id __user *_id) |
| 978 | { |
| 979 | struct snd_card *card = file->card; |
| 980 | struct snd_ctl_elem_id id; |
| 981 | struct snd_kcontrol *kctl; |
| 982 | struct snd_kcontrol_volatile *vd; |
| 983 | int result; |
| 984 | |
| 985 | if (copy_from_user(&id, _id, sizeof(id))) |
| 986 | return -EFAULT; |
| 987 | down_write(&card->controls_rwsem); |
| 988 | kctl = snd_ctl_find_id(card, &id); |
| 989 | if (kctl == NULL) { |
| 990 | result = -ENOENT; |
| 991 | } else { |
| 992 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; |
| 993 | if (vd->owner == NULL) |
| 994 | result = -EINVAL; |
| 995 | else if (vd->owner != file) |
| 996 | result = -EPERM; |
| 997 | else { |
| 998 | vd->owner = NULL; |
| 999 | result = 0; |
| 1000 | } |
| 1001 | } |
| 1002 | up_write(&card->controls_rwsem); |
| 1003 | return result; |
| 1004 | } |
| 1005 | |
| 1006 | struct user_element { |
| 1007 | struct snd_ctl_elem_info info; |
| 1008 | struct snd_card *card; |
| 1009 | void *elem_data; /* element data */ |
| 1010 | unsigned long elem_data_size; /* size of element data in bytes */ |
| 1011 | void *tlv_data; /* TLV data */ |
| 1012 | unsigned long tlv_data_size; /* TLV data size */ |
| 1013 | void *priv_data; /* private data (like strings for enumerated type) */ |
| 1014 | }; |
| 1015 | |
| 1016 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
| 1017 | struct snd_ctl_elem_info *uinfo) |
| 1018 | { |
| 1019 | struct user_element *ue = kcontrol->private_data; |
| 1020 | |
| 1021 | *uinfo = ue->info; |
| 1022 | return 0; |
| 1023 | } |
| 1024 | |
| 1025 | static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol, |
| 1026 | struct snd_ctl_elem_info *uinfo) |
| 1027 | { |
| 1028 | struct user_element *ue = kcontrol->private_data; |
| 1029 | const char *names; |
| 1030 | unsigned int item; |
| 1031 | |
| 1032 | item = uinfo->value.enumerated.item; |
| 1033 | |
| 1034 | *uinfo = ue->info; |
| 1035 | |
| 1036 | item = min(item, uinfo->value.enumerated.items - 1); |
| 1037 | uinfo->value.enumerated.item = item; |
| 1038 | |
| 1039 | names = ue->priv_data; |
| 1040 | for (; item > 0; --item) |
| 1041 | names += strlen(names) + 1; |
| 1042 | strcpy(uinfo->value.enumerated.name, names); |
| 1043 | |
| 1044 | return 0; |
| 1045 | } |
| 1046 | |
| 1047 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
| 1048 | struct snd_ctl_elem_value *ucontrol) |
| 1049 | { |
| 1050 | struct user_element *ue = kcontrol->private_data; |
| 1051 | |
| 1052 | mutex_lock(&ue->card->user_ctl_lock); |
| 1053 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); |
| 1054 | mutex_unlock(&ue->card->user_ctl_lock); |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
| 1058 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
| 1059 | struct snd_ctl_elem_value *ucontrol) |
| 1060 | { |
| 1061 | int change; |
| 1062 | struct user_element *ue = kcontrol->private_data; |
| 1063 | |
| 1064 | mutex_lock(&ue->card->user_ctl_lock); |
| 1065 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; |
| 1066 | if (change) |
| 1067 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); |
| 1068 | mutex_unlock(&ue->card->user_ctl_lock); |
| 1069 | return change; |
| 1070 | } |
| 1071 | |
| 1072 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, |
| 1073 | int op_flag, |
| 1074 | unsigned int size, |
| 1075 | unsigned int __user *tlv) |
| 1076 | { |
| 1077 | struct user_element *ue = kcontrol->private_data; |
| 1078 | int change = 0; |
| 1079 | void *new_data; |
| 1080 | |
| 1081 | if (op_flag > 0) { |
| 1082 | if (size > 1024 * 128) /* sane value */ |
| 1083 | return -EINVAL; |
| 1084 | |
| 1085 | new_data = memdup_user(tlv, size); |
| 1086 | if (IS_ERR(new_data)) |
| 1087 | return PTR_ERR(new_data); |
| 1088 | mutex_lock(&ue->card->user_ctl_lock); |
| 1089 | change = ue->tlv_data_size != size; |
| 1090 | if (!change) |
| 1091 | change = memcmp(ue->tlv_data, new_data, size) != 0; |
| 1092 | kfree(ue->tlv_data); |
| 1093 | ue->tlv_data = new_data; |
| 1094 | ue->tlv_data_size = size; |
| 1095 | mutex_unlock(&ue->card->user_ctl_lock); |
| 1096 | } else { |
| 1097 | int ret = 0; |
| 1098 | |
| 1099 | mutex_lock(&ue->card->user_ctl_lock); |
| 1100 | if (!ue->tlv_data_size || !ue->tlv_data) { |
| 1101 | ret = -ENXIO; |
| 1102 | goto err_unlock; |
| 1103 | } |
| 1104 | if (size < ue->tlv_data_size) { |
| 1105 | ret = -ENOSPC; |
| 1106 | goto err_unlock; |
| 1107 | } |
| 1108 | if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) |
| 1109 | ret = -EFAULT; |
| 1110 | err_unlock: |
| 1111 | mutex_unlock(&ue->card->user_ctl_lock); |
| 1112 | if (ret) |
| 1113 | return ret; |
| 1114 | } |
| 1115 | return change; |
| 1116 | } |
| 1117 | |
| 1118 | static int snd_ctl_elem_init_enum_names(struct user_element *ue) |
| 1119 | { |
| 1120 | char *names, *p; |
| 1121 | size_t buf_len, name_len; |
| 1122 | unsigned int i; |
| 1123 | const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr; |
| 1124 | |
| 1125 | if (ue->info.value.enumerated.names_length > 64 * 1024) |
| 1126 | return -EINVAL; |
| 1127 | |
| 1128 | names = memdup_user((const void __user *)user_ptrval, |
| 1129 | ue->info.value.enumerated.names_length); |
| 1130 | if (IS_ERR(names)) |
| 1131 | return PTR_ERR(names); |
| 1132 | |
| 1133 | /* check that there are enough valid names */ |
| 1134 | buf_len = ue->info.value.enumerated.names_length; |
| 1135 | p = names; |
| 1136 | for (i = 0; i < ue->info.value.enumerated.items; ++i) { |
| 1137 | name_len = strnlen(p, buf_len); |
| 1138 | if (name_len == 0 || name_len >= 64 || name_len == buf_len) { |
| 1139 | kfree(names); |
| 1140 | return -EINVAL; |
| 1141 | } |
| 1142 | p += name_len + 1; |
| 1143 | buf_len -= name_len + 1; |
| 1144 | } |
| 1145 | |
| 1146 | ue->priv_data = names; |
| 1147 | ue->info.value.enumerated.names_ptr = 0; |
| 1148 | |
| 1149 | return 0; |
| 1150 | } |
| 1151 | |
| 1152 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
| 1153 | { |
| 1154 | struct user_element *ue = kcontrol->private_data; |
| 1155 | |
| 1156 | kfree(ue->tlv_data); |
| 1157 | kfree(ue->priv_data); |
| 1158 | kfree(ue); |
| 1159 | } |
| 1160 | |
| 1161 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
| 1162 | struct snd_ctl_elem_info *info, int replace) |
| 1163 | { |
| 1164 | struct snd_card *card = file->card; |
| 1165 | struct snd_kcontrol kctl, *_kctl; |
| 1166 | unsigned int access; |
| 1167 | long private_size; |
| 1168 | struct user_element *ue; |
| 1169 | int idx, err; |
| 1170 | |
| 1171 | if (info->count < 1) |
| 1172 | return -EINVAL; |
| 1173 | if (!*info->id.name) |
| 1174 | return -EINVAL; |
| 1175 | if (strnlen(info->id.name, sizeof(info->id.name)) >= sizeof(info->id.name)) |
| 1176 | return -EINVAL; |
| 1177 | access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : |
| 1178 | (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
| 1179 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
| 1180 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)); |
| 1181 | info->id.numid = 0; |
| 1182 | memset(&kctl, 0, sizeof(kctl)); |
| 1183 | |
| 1184 | if (replace) { |
| 1185 | err = snd_ctl_remove_user_ctl(file, &info->id); |
| 1186 | if (err) |
| 1187 | return err; |
| 1188 | } |
| 1189 | |
| 1190 | if (card->user_ctl_count >= MAX_USER_CONTROLS) |
| 1191 | return -ENOMEM; |
| 1192 | |
| 1193 | memcpy(&kctl.id, &info->id, sizeof(info->id)); |
| 1194 | kctl.count = info->owner ? info->owner : 1; |
| 1195 | access |= SNDRV_CTL_ELEM_ACCESS_USER; |
| 1196 | if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) |
| 1197 | kctl.info = snd_ctl_elem_user_enum_info; |
| 1198 | else |
| 1199 | kctl.info = snd_ctl_elem_user_info; |
| 1200 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) |
| 1201 | kctl.get = snd_ctl_elem_user_get; |
| 1202 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) |
| 1203 | kctl.put = snd_ctl_elem_user_put; |
| 1204 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) { |
| 1205 | kctl.tlv.c = snd_ctl_elem_user_tlv; |
| 1206 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; |
| 1207 | } |
| 1208 | switch (info->type) { |
| 1209 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: |
| 1210 | case SNDRV_CTL_ELEM_TYPE_INTEGER: |
| 1211 | private_size = sizeof(long); |
| 1212 | if (info->count > 128) |
| 1213 | return -EINVAL; |
| 1214 | break; |
| 1215 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: |
| 1216 | private_size = sizeof(long long); |
| 1217 | if (info->count > 64) |
| 1218 | return -EINVAL; |
| 1219 | break; |
| 1220 | case SNDRV_CTL_ELEM_TYPE_ENUMERATED: |
| 1221 | private_size = sizeof(unsigned int); |
| 1222 | if (info->count > 128 || info->value.enumerated.items == 0) |
| 1223 | return -EINVAL; |
| 1224 | break; |
| 1225 | case SNDRV_CTL_ELEM_TYPE_BYTES: |
| 1226 | private_size = sizeof(unsigned char); |
| 1227 | if (info->count > 512) |
| 1228 | return -EINVAL; |
| 1229 | break; |
| 1230 | case SNDRV_CTL_ELEM_TYPE_IEC958: |
| 1231 | private_size = sizeof(struct snd_aes_iec958); |
| 1232 | if (info->count != 1) |
| 1233 | return -EINVAL; |
| 1234 | break; |
| 1235 | default: |
| 1236 | return -EINVAL; |
| 1237 | } |
| 1238 | private_size *= info->count; |
| 1239 | ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); |
| 1240 | if (ue == NULL) |
| 1241 | return -ENOMEM; |
| 1242 | ue->card = card; |
| 1243 | ue->info = *info; |
| 1244 | ue->info.access = 0; |
| 1245 | ue->elem_data = (char *)ue + sizeof(*ue); |
| 1246 | ue->elem_data_size = private_size; |
| 1247 | if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) { |
| 1248 | err = snd_ctl_elem_init_enum_names(ue); |
| 1249 | if (err < 0) { |
| 1250 | kfree(ue); |
| 1251 | return err; |
| 1252 | } |
| 1253 | } |
| 1254 | kctl.private_free = snd_ctl_elem_user_free; |
| 1255 | _kctl = snd_ctl_new(&kctl, access); |
| 1256 | if (_kctl == NULL) { |
| 1257 | kfree(ue->priv_data); |
| 1258 | kfree(ue); |
| 1259 | return -ENOMEM; |
| 1260 | } |
| 1261 | _kctl->private_data = ue; |
| 1262 | for (idx = 0; idx < _kctl->count; idx++) |
| 1263 | _kctl->vd[idx].owner = file; |
| 1264 | err = snd_ctl_add(card, _kctl); |
| 1265 | if (err < 0) |
| 1266 | return err; |
| 1267 | |
| 1268 | down_write(&card->controls_rwsem); |
| 1269 | card->user_ctl_count++; |
| 1270 | up_write(&card->controls_rwsem); |
| 1271 | |
| 1272 | return 0; |
| 1273 | } |
| 1274 | |
| 1275 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
| 1276 | struct snd_ctl_elem_info __user *_info, int replace) |
| 1277 | { |
| 1278 | struct snd_ctl_elem_info info; |
| 1279 | if (copy_from_user(&info, _info, sizeof(info))) |
| 1280 | return -EFAULT; |
| 1281 | return snd_ctl_elem_add(file, &info, replace); |
| 1282 | } |
| 1283 | |
| 1284 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
| 1285 | struct snd_ctl_elem_id __user *_id) |
| 1286 | { |
| 1287 | struct snd_ctl_elem_id id; |
| 1288 | |
| 1289 | if (copy_from_user(&id, _id, sizeof(id))) |
| 1290 | return -EFAULT; |
| 1291 | return snd_ctl_remove_user_ctl(file, &id); |
| 1292 | } |
| 1293 | |
| 1294 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
| 1295 | { |
| 1296 | int subscribe; |
| 1297 | if (get_user(subscribe, ptr)) |
| 1298 | return -EFAULT; |
| 1299 | if (subscribe < 0) { |
| 1300 | subscribe = file->subscribed; |
| 1301 | if (put_user(subscribe, ptr)) |
| 1302 | return -EFAULT; |
| 1303 | return 0; |
| 1304 | } |
| 1305 | if (subscribe) { |
| 1306 | file->subscribed = 1; |
| 1307 | return 0; |
| 1308 | } else if (file->subscribed) { |
| 1309 | snd_ctl_empty_read_queue(file); |
| 1310 | file->subscribed = 0; |
| 1311 | } |
| 1312 | return 0; |
| 1313 | } |
| 1314 | |
| 1315 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
| 1316 | struct snd_ctl_tlv __user *_tlv, |
| 1317 | int op_flag) |
| 1318 | { |
| 1319 | struct snd_card *card = file->card; |
| 1320 | struct snd_ctl_tlv tlv; |
| 1321 | struct snd_kcontrol *kctl; |
| 1322 | struct snd_kcontrol_volatile *vd; |
| 1323 | unsigned int len; |
| 1324 | int err = 0; |
| 1325 | |
| 1326 | if (copy_from_user(&tlv, _tlv, sizeof(tlv))) |
| 1327 | return -EFAULT; |
| 1328 | if (tlv.length < sizeof(unsigned int) * 2) |
| 1329 | return -EINVAL; |
| 1330 | if (!tlv.numid) |
| 1331 | return -EINVAL; |
| 1332 | down_read(&card->controls_rwsem); |
| 1333 | kctl = snd_ctl_find_numid(card, tlv.numid); |
| 1334 | if (kctl == NULL) { |
| 1335 | err = -ENOENT; |
| 1336 | goto __kctl_end; |
| 1337 | } |
| 1338 | if (kctl->tlv.p == NULL) { |
| 1339 | err = -ENXIO; |
| 1340 | goto __kctl_end; |
| 1341 | } |
| 1342 | vd = &kctl->vd[tlv.numid - kctl->id.numid]; |
| 1343 | if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || |
| 1344 | (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || |
| 1345 | (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { |
| 1346 | err = -ENXIO; |
| 1347 | goto __kctl_end; |
| 1348 | } |
| 1349 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { |
| 1350 | if (vd->owner != NULL && vd->owner != file) { |
| 1351 | err = -EPERM; |
| 1352 | goto __kctl_end; |
| 1353 | } |
| 1354 | err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); |
| 1355 | if (err > 0) { |
| 1356 | struct snd_ctl_elem_id id = kctl->id; |
| 1357 | up_read(&card->controls_rwsem); |
| 1358 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &id); |
| 1359 | return 0; |
| 1360 | } |
| 1361 | } else { |
| 1362 | if (op_flag) { |
| 1363 | err = -ENXIO; |
| 1364 | goto __kctl_end; |
| 1365 | } |
| 1366 | len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); |
| 1367 | if (tlv.length < len) { |
| 1368 | err = -ENOMEM; |
| 1369 | goto __kctl_end; |
| 1370 | } |
| 1371 | if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) |
| 1372 | err = -EFAULT; |
| 1373 | } |
| 1374 | __kctl_end: |
| 1375 | up_read(&card->controls_rwsem); |
| 1376 | return err; |
| 1377 | } |
| 1378 | |
| 1379 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 1380 | { |
| 1381 | struct snd_ctl_file *ctl; |
| 1382 | struct snd_card *card; |
| 1383 | struct snd_kctl_ioctl *p; |
| 1384 | void __user *argp = (void __user *)arg; |
| 1385 | int __user *ip = argp; |
| 1386 | int err; |
| 1387 | |
| 1388 | ctl = file->private_data; |
| 1389 | card = ctl->card; |
| 1390 | if (snd_BUG_ON(!card)) |
| 1391 | return -ENXIO; |
| 1392 | switch (cmd) { |
| 1393 | case SNDRV_CTL_IOCTL_PVERSION: |
| 1394 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; |
| 1395 | case SNDRV_CTL_IOCTL_CARD_INFO: |
| 1396 | return snd_ctl_card_info(card, ctl, cmd, argp); |
| 1397 | case SNDRV_CTL_IOCTL_ELEM_LIST: |
| 1398 | return snd_ctl_elem_list(card, argp); |
| 1399 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
| 1400 | return snd_ctl_elem_info_user(ctl, argp); |
| 1401 | case SNDRV_CTL_IOCTL_ELEM_READ: |
| 1402 | return snd_ctl_elem_read_user(card, argp); |
| 1403 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
| 1404 | return snd_ctl_elem_write_user(ctl, argp); |
| 1405 | case SNDRV_CTL_IOCTL_ELEM_LOCK: |
| 1406 | return snd_ctl_elem_lock(ctl, argp); |
| 1407 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: |
| 1408 | return snd_ctl_elem_unlock(ctl, argp); |
| 1409 | case SNDRV_CTL_IOCTL_ELEM_ADD: |
| 1410 | return snd_ctl_elem_add_user(ctl, argp, 0); |
| 1411 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: |
| 1412 | return snd_ctl_elem_add_user(ctl, argp, 1); |
| 1413 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: |
| 1414 | return snd_ctl_elem_remove(ctl, argp); |
| 1415 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: |
| 1416 | return snd_ctl_subscribe_events(ctl, ip); |
| 1417 | case SNDRV_CTL_IOCTL_TLV_READ: |
| 1418 | return snd_ctl_tlv_ioctl(ctl, argp, 0); |
| 1419 | case SNDRV_CTL_IOCTL_TLV_WRITE: |
| 1420 | return snd_ctl_tlv_ioctl(ctl, argp, 1); |
| 1421 | case SNDRV_CTL_IOCTL_TLV_COMMAND: |
| 1422 | return snd_ctl_tlv_ioctl(ctl, argp, -1); |
| 1423 | case SNDRV_CTL_IOCTL_POWER: |
| 1424 | return -ENOPROTOOPT; |
| 1425 | case SNDRV_CTL_IOCTL_POWER_STATE: |
| 1426 | #ifdef CONFIG_PM |
| 1427 | return put_user(card->power_state, ip) ? -EFAULT : 0; |
| 1428 | #else |
| 1429 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; |
| 1430 | #endif |
| 1431 | } |
| 1432 | down_read(&snd_ioctl_rwsem); |
| 1433 | list_for_each_entry(p, &snd_control_ioctls, list) { |
| 1434 | err = p->fioctl(card, ctl, cmd, arg); |
| 1435 | if (err != -ENOIOCTLCMD) { |
| 1436 | up_read(&snd_ioctl_rwsem); |
| 1437 | return err; |
| 1438 | } |
| 1439 | } |
| 1440 | up_read(&snd_ioctl_rwsem); |
| 1441 | snd_printdd("unknown ioctl = 0x%x\n", cmd); |
| 1442 | return -ENOTTY; |
| 1443 | } |
| 1444 | |
| 1445 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
| 1446 | size_t count, loff_t * offset) |
| 1447 | { |
| 1448 | struct snd_ctl_file *ctl; |
| 1449 | int err = 0; |
| 1450 | ssize_t result = 0; |
| 1451 | |
| 1452 | ctl = file->private_data; |
| 1453 | if (snd_BUG_ON(!ctl || !ctl->card)) |
| 1454 | return -ENXIO; |
| 1455 | if (!ctl->subscribed) |
| 1456 | return -EBADFD; |
| 1457 | if (count < sizeof(struct snd_ctl_event)) |
| 1458 | return -EINVAL; |
| 1459 | spin_lock_irq(&ctl->read_lock); |
| 1460 | while (count >= sizeof(struct snd_ctl_event)) { |
| 1461 | struct snd_ctl_event ev; |
| 1462 | struct snd_kctl_event *kev; |
| 1463 | while (list_empty(&ctl->events)) { |
| 1464 | wait_queue_t wait; |
| 1465 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { |
| 1466 | err = -EAGAIN; |
| 1467 | goto __end_lock; |
| 1468 | } |
| 1469 | init_waitqueue_entry(&wait, current); |
| 1470 | add_wait_queue(&ctl->change_sleep, &wait); |
| 1471 | set_current_state(TASK_INTERRUPTIBLE); |
| 1472 | spin_unlock_irq(&ctl->read_lock); |
| 1473 | schedule(); |
| 1474 | remove_wait_queue(&ctl->change_sleep, &wait); |
| 1475 | if (ctl->card->shutdown) |
| 1476 | return -ENODEV; |
| 1477 | if (signal_pending(current)) |
| 1478 | return -ERESTARTSYS; |
| 1479 | spin_lock_irq(&ctl->read_lock); |
| 1480 | } |
| 1481 | kev = snd_kctl_event(ctl->events.next); |
| 1482 | ev.type = SNDRV_CTL_EVENT_ELEM; |
| 1483 | ev.data.elem.mask = kev->mask; |
| 1484 | ev.data.elem.id = kev->id; |
| 1485 | list_del(&kev->list); |
| 1486 | spin_unlock_irq(&ctl->read_lock); |
| 1487 | kfree(kev); |
| 1488 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
| 1489 | err = -EFAULT; |
| 1490 | goto __end; |
| 1491 | } |
| 1492 | spin_lock_irq(&ctl->read_lock); |
| 1493 | buffer += sizeof(struct snd_ctl_event); |
| 1494 | count -= sizeof(struct snd_ctl_event); |
| 1495 | result += sizeof(struct snd_ctl_event); |
| 1496 | } |
| 1497 | __end_lock: |
| 1498 | spin_unlock_irq(&ctl->read_lock); |
| 1499 | __end: |
| 1500 | return result > 0 ? result : err; |
| 1501 | } |
| 1502 | |
| 1503 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) |
| 1504 | { |
| 1505 | unsigned int mask; |
| 1506 | struct snd_ctl_file *ctl; |
| 1507 | |
| 1508 | ctl = file->private_data; |
| 1509 | if (!ctl->subscribed) |
| 1510 | return 0; |
| 1511 | poll_wait(file, &ctl->change_sleep, wait); |
| 1512 | |
| 1513 | mask = 0; |
| 1514 | if (!list_empty(&ctl->events)) |
| 1515 | mask |= POLLIN | POLLRDNORM; |
| 1516 | |
| 1517 | return mask; |
| 1518 | } |
| 1519 | |
| 1520 | /* |
| 1521 | * register the device-specific control-ioctls. |
| 1522 | * called from each device manager like pcm.c, hwdep.c, etc. |
| 1523 | */ |
| 1524 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) |
| 1525 | { |
| 1526 | struct snd_kctl_ioctl *pn; |
| 1527 | |
| 1528 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
| 1529 | if (pn == NULL) |
| 1530 | return -ENOMEM; |
| 1531 | pn->fioctl = fcn; |
| 1532 | down_write(&snd_ioctl_rwsem); |
| 1533 | list_add_tail(&pn->list, lists); |
| 1534 | up_write(&snd_ioctl_rwsem); |
| 1535 | return 0; |
| 1536 | } |
| 1537 | |
| 1538 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) |
| 1539 | { |
| 1540 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); |
| 1541 | } |
| 1542 | |
| 1543 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
| 1544 | |
| 1545 | #ifdef CONFIG_COMPAT |
| 1546 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
| 1547 | { |
| 1548 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); |
| 1549 | } |
| 1550 | |
| 1551 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); |
| 1552 | #endif |
| 1553 | |
| 1554 | /* |
| 1555 | * de-register the device-specific control-ioctls. |
| 1556 | */ |
| 1557 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
| 1558 | struct list_head *lists) |
| 1559 | { |
| 1560 | struct snd_kctl_ioctl *p; |
| 1561 | |
| 1562 | if (snd_BUG_ON(!fcn)) |
| 1563 | return -EINVAL; |
| 1564 | down_write(&snd_ioctl_rwsem); |
| 1565 | list_for_each_entry(p, lists, list) { |
| 1566 | if (p->fioctl == fcn) { |
| 1567 | list_del(&p->list); |
| 1568 | up_write(&snd_ioctl_rwsem); |
| 1569 | kfree(p); |
| 1570 | return 0; |
| 1571 | } |
| 1572 | } |
| 1573 | up_write(&snd_ioctl_rwsem); |
| 1574 | snd_BUG(); |
| 1575 | return -EINVAL; |
| 1576 | } |
| 1577 | |
| 1578 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) |
| 1579 | { |
| 1580 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); |
| 1581 | } |
| 1582 | |
| 1583 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
| 1584 | |
| 1585 | #ifdef CONFIG_COMPAT |
| 1586 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
| 1587 | { |
| 1588 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); |
| 1589 | } |
| 1590 | |
| 1591 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
| 1592 | #endif |
| 1593 | |
| 1594 | static int snd_ctl_fasync(int fd, struct file * file, int on) |
| 1595 | { |
| 1596 | struct snd_ctl_file *ctl; |
| 1597 | |
| 1598 | ctl = file->private_data; |
| 1599 | return fasync_helper(fd, file, on, &ctl->fasync); |
| 1600 | } |
| 1601 | |
| 1602 | /* |
| 1603 | * ioctl32 compat |
| 1604 | */ |
| 1605 | #ifdef CONFIG_COMPAT |
| 1606 | #include "control_compat.c" |
| 1607 | #else |
| 1608 | #define snd_ctl_ioctl_compat NULL |
| 1609 | #endif |
| 1610 | |
| 1611 | /* |
| 1612 | * INIT PART |
| 1613 | */ |
| 1614 | |
| 1615 | static const struct file_operations snd_ctl_f_ops = |
| 1616 | { |
| 1617 | .owner = THIS_MODULE, |
| 1618 | .read = snd_ctl_read, |
| 1619 | .open = snd_ctl_open, |
| 1620 | .release = snd_ctl_release, |
| 1621 | .llseek = no_llseek, |
| 1622 | .poll = snd_ctl_poll, |
| 1623 | .unlocked_ioctl = snd_ctl_ioctl, |
| 1624 | .compat_ioctl = snd_ctl_ioctl_compat, |
| 1625 | .fasync = snd_ctl_fasync, |
| 1626 | }; |
| 1627 | |
| 1628 | /* |
| 1629 | * registration of the control device |
| 1630 | */ |
| 1631 | static int snd_ctl_dev_register(struct snd_device *device) |
| 1632 | { |
| 1633 | struct snd_card *card = device->device_data; |
| 1634 | int err, cardnum; |
| 1635 | char name[16]; |
| 1636 | |
| 1637 | if (snd_BUG_ON(!card)) |
| 1638 | return -ENXIO; |
| 1639 | cardnum = card->number; |
| 1640 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
| 1641 | return -ENXIO; |
| 1642 | sprintf(name, "controlC%i", cardnum); |
| 1643 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
| 1644 | &snd_ctl_f_ops, card, name)) < 0) |
| 1645 | return err; |
| 1646 | return 0; |
| 1647 | } |
| 1648 | |
| 1649 | /* |
| 1650 | * disconnection of the control device |
| 1651 | */ |
| 1652 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
| 1653 | { |
| 1654 | struct snd_card *card = device->device_data; |
| 1655 | struct snd_ctl_file *ctl; |
| 1656 | int err, cardnum; |
| 1657 | |
| 1658 | if (snd_BUG_ON(!card)) |
| 1659 | return -ENXIO; |
| 1660 | cardnum = card->number; |
| 1661 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
| 1662 | return -ENXIO; |
| 1663 | |
| 1664 | read_lock(&card->ctl_files_rwlock); |
| 1665 | list_for_each_entry(ctl, &card->ctl_files, list) { |
| 1666 | wake_up(&ctl->change_sleep); |
| 1667 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); |
| 1668 | } |
| 1669 | read_unlock(&card->ctl_files_rwlock); |
| 1670 | |
| 1671 | if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, |
| 1672 | card, -1)) < 0) |
| 1673 | return err; |
| 1674 | return 0; |
| 1675 | } |
| 1676 | |
| 1677 | /* |
| 1678 | * free all controls |
| 1679 | */ |
| 1680 | static int snd_ctl_dev_free(struct snd_device *device) |
| 1681 | { |
| 1682 | struct snd_card *card = device->device_data; |
| 1683 | struct snd_kcontrol *control; |
| 1684 | |
| 1685 | down_write(&card->controls_rwsem); |
| 1686 | while (!list_empty(&card->controls)) { |
| 1687 | control = snd_kcontrol(card->controls.next); |
| 1688 | snd_ctl_remove(card, control); |
| 1689 | } |
| 1690 | up_write(&card->controls_rwsem); |
| 1691 | return 0; |
| 1692 | } |
| 1693 | |
| 1694 | /* |
| 1695 | * create control core: |
| 1696 | * called from init.c |
| 1697 | */ |
| 1698 | int snd_ctl_create(struct snd_card *card) |
| 1699 | { |
| 1700 | static struct snd_device_ops ops = { |
| 1701 | .dev_free = snd_ctl_dev_free, |
| 1702 | .dev_register = snd_ctl_dev_register, |
| 1703 | .dev_disconnect = snd_ctl_dev_disconnect, |
| 1704 | }; |
| 1705 | |
| 1706 | if (snd_BUG_ON(!card)) |
| 1707 | return -ENXIO; |
| 1708 | return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); |
| 1709 | } |
| 1710 | |
| 1711 | /* |
| 1712 | * Frequently used control callbacks/helpers |
| 1713 | */ |
| 1714 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, |
| 1715 | struct snd_ctl_elem_info *uinfo) |
| 1716 | { |
| 1717 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; |
| 1718 | uinfo->count = 1; |
| 1719 | uinfo->value.integer.min = 0; |
| 1720 | uinfo->value.integer.max = 1; |
| 1721 | return 0; |
| 1722 | } |
| 1723 | |
| 1724 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); |
| 1725 | |
| 1726 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, |
| 1727 | struct snd_ctl_elem_info *uinfo) |
| 1728 | { |
| 1729 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; |
| 1730 | uinfo->count = 2; |
| 1731 | uinfo->value.integer.min = 0; |
| 1732 | uinfo->value.integer.max = 1; |
| 1733 | return 0; |
| 1734 | } |
| 1735 | |
| 1736 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); |
| 1737 | |
| 1738 | /** |
| 1739 | * snd_ctl_enum_info - fills the info structure for an enumerated control |
| 1740 | * @info: the structure to be filled |
| 1741 | * @channels: the number of the control's channels; often one |
| 1742 | * @items: the number of control values; also the size of @names |
| 1743 | * @names: an array containing the names of all control values |
| 1744 | * |
| 1745 | * Sets all required fields in @info to their appropriate values. |
| 1746 | * If the control's accessibility is not the default (readable and writable), |
| 1747 | * the caller has to fill @info->access. |
| 1748 | * |
| 1749 | * Return: Zero. |
| 1750 | */ |
| 1751 | int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels, |
| 1752 | unsigned int items, const char *const names[]) |
| 1753 | { |
| 1754 | info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; |
| 1755 | info->count = channels; |
| 1756 | info->value.enumerated.items = items; |
| 1757 | if (info->value.enumerated.item >= items) |
| 1758 | info->value.enumerated.item = items - 1; |
| 1759 | strlcpy(info->value.enumerated.name, |
| 1760 | names[info->value.enumerated.item], |
| 1761 | sizeof(info->value.enumerated.name)); |
| 1762 | return 0; |
| 1763 | } |
| 1764 | EXPORT_SYMBOL(snd_ctl_enum_info); |