1 /* 2 * Hardware dependent layer 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/major.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/time.h> 26 #include <linux/mutex.h> 27 #include <linux/module.h> 28 #include <sound/core.h> 29 #include <sound/control.h> 30 #include <sound/minors.h> 31 #include <sound/hwdep.h> 32 #include <sound/info.h> 33 34 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 35 MODULE_DESCRIPTION("Hardware dependent layer"); 36 MODULE_LICENSE("GPL"); 37 38 static LIST_HEAD(snd_hwdep_devices); 39 static DEFINE_MUTEX(register_mutex); 40 41 static int snd_hwdep_dev_free(struct snd_device *device); 42 static int snd_hwdep_dev_register(struct snd_device *device); 43 static int snd_hwdep_dev_disconnect(struct snd_device *device); 44 45 46 static struct snd_hwdep *snd_hwdep_search(struct snd_card *card, int device) 47 { 48 struct snd_hwdep *hwdep; 49 50 list_for_each_entry(hwdep, &snd_hwdep_devices, list) 51 if (hwdep->card == card && hwdep->device == device) 52 return hwdep; 53 return NULL; 54 } 55 56 static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig) 57 { 58 struct snd_hwdep *hw = file->private_data; 59 if (hw->ops.llseek) 60 return hw->ops.llseek(hw, file, offset, orig); 61 return -ENXIO; 62 } 63 64 static ssize_t snd_hwdep_read(struct file * file, char __user *buf, 65 size_t count, loff_t *offset) 66 { 67 struct snd_hwdep *hw = file->private_data; 68 if (hw->ops.read) 69 return hw->ops.read(hw, buf, count, offset); 70 return -ENXIO; 71 } 72 73 static ssize_t snd_hwdep_write(struct file * file, const char __user *buf, 74 size_t count, loff_t *offset) 75 { 76 struct snd_hwdep *hw = file->private_data; 77 if (hw->ops.write) 78 return hw->ops.write(hw, buf, count, offset); 79 return -ENXIO; 80 } 81 82 static int snd_hwdep_open(struct inode *inode, struct file * file) 83 { 84 int major = imajor(inode); 85 struct snd_hwdep *hw; 86 int err; 87 wait_queue_t wait; 88 89 if (major == snd_major) { 90 hw = snd_lookup_minor_data(iminor(inode), 91 SNDRV_DEVICE_TYPE_HWDEP); 92 #ifdef CONFIG_SND_OSSEMUL 93 } else if (major == SOUND_MAJOR) { 94 hw = snd_lookup_oss_minor_data(iminor(inode), 95 SNDRV_OSS_DEVICE_TYPE_DMFM); 96 #endif 97 } else 98 return -ENXIO; 99 if (hw == NULL) 100 return -ENODEV; 101 102 if (!try_module_get(hw->card->module)) { 103 snd_card_unref(hw->card); 104 return -EFAULT; 105 } 106 107 init_waitqueue_entry(&wait, current); 108 add_wait_queue(&hw->open_wait, &wait); 109 mutex_lock(&hw->open_mutex); 110 while (1) { 111 if (hw->exclusive && hw->used > 0) { 112 err = -EBUSY; 113 break; 114 } 115 if (!hw->ops.open) { 116 err = 0; 117 break; 118 } 119 err = hw->ops.open(hw, file); 120 if (err >= 0) 121 break; 122 if (err == -EAGAIN) { 123 if (file->f_flags & O_NONBLOCK) { 124 err = -EBUSY; 125 break; 126 } 127 } else 128 break; 129 set_current_state(TASK_INTERRUPTIBLE); 130 mutex_unlock(&hw->open_mutex); 131 schedule(); 132 mutex_lock(&hw->open_mutex); 133 if (hw->card->shutdown) { 134 err = -ENODEV; 135 break; 136 } 137 if (signal_pending(current)) { 138 err = -ERESTARTSYS; 139 break; 140 } 141 } 142 remove_wait_queue(&hw->open_wait, &wait); 143 if (err >= 0) { 144 err = snd_card_file_add(hw->card, file); 145 if (err >= 0) { 146 file->private_data = hw; 147 hw->used++; 148 } else { 149 if (hw->ops.release) 150 hw->ops.release(hw, file); 151 } 152 } 153 mutex_unlock(&hw->open_mutex); 154 if (err < 0) 155 module_put(hw->card->module); 156 snd_card_unref(hw->card); 157 return err; 158 } 159 160 static int snd_hwdep_release(struct inode *inode, struct file * file) 161 { 162 int err = 0; 163 struct snd_hwdep *hw = file->private_data; 164 struct module *mod = hw->card->module; 165 166 mutex_lock(&hw->open_mutex); 167 if (hw->ops.release) 168 err = hw->ops.release(hw, file); 169 if (hw->used > 0) 170 hw->used--; 171 mutex_unlock(&hw->open_mutex); 172 wake_up(&hw->open_wait); 173 174 snd_card_file_remove(hw->card, file); 175 module_put(mod); 176 return err; 177 } 178 179 static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait) 180 { 181 struct snd_hwdep *hw = file->private_data; 182 if (hw->ops.poll) 183 return hw->ops.poll(hw, file, wait); 184 return 0; 185 } 186 187 static int snd_hwdep_info(struct snd_hwdep *hw, 188 struct snd_hwdep_info __user *_info) 189 { 190 struct snd_hwdep_info info; 191 192 memset(&info, 0, sizeof(info)); 193 info.card = hw->card->number; 194 strlcpy(info.id, hw->id, sizeof(info.id)); 195 strlcpy(info.name, hw->name, sizeof(info.name)); 196 info.iface = hw->iface; 197 if (copy_to_user(_info, &info, sizeof(info))) 198 return -EFAULT; 199 return 0; 200 } 201 202 static int snd_hwdep_dsp_status(struct snd_hwdep *hw, 203 struct snd_hwdep_dsp_status __user *_info) 204 { 205 struct snd_hwdep_dsp_status info; 206 int err; 207 208 if (! hw->ops.dsp_status) 209 return -ENXIO; 210 memset(&info, 0, sizeof(info)); 211 info.dsp_loaded = hw->dsp_loaded; 212 if ((err = hw->ops.dsp_status(hw, &info)) < 0) 213 return err; 214 if (copy_to_user(_info, &info, sizeof(info))) 215 return -EFAULT; 216 return 0; 217 } 218 219 static int snd_hwdep_dsp_load(struct snd_hwdep *hw, 220 struct snd_hwdep_dsp_image __user *_info) 221 { 222 struct snd_hwdep_dsp_image info; 223 int err; 224 225 if (! hw->ops.dsp_load) 226 return -ENXIO; 227 memset(&info, 0, sizeof(info)); 228 if (copy_from_user(&info, _info, sizeof(info))) 229 return -EFAULT; 230 /* check whether the dsp was already loaded */ 231 if (hw->dsp_loaded & (1 << info.index)) 232 return -EBUSY; 233 if (!access_ok(VERIFY_READ, info.image, info.length)) 234 return -EFAULT; 235 err = hw->ops.dsp_load(hw, &info); 236 if (err < 0) 237 return err; 238 hw->dsp_loaded |= (1 << info.index); 239 return 0; 240 } 241 242 static long snd_hwdep_ioctl(struct file * file, unsigned int cmd, 243 unsigned long arg) 244 { 245 struct snd_hwdep *hw = file->private_data; 246 void __user *argp = (void __user *)arg; 247 switch (cmd) { 248 case SNDRV_HWDEP_IOCTL_PVERSION: 249 return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp); 250 case SNDRV_HWDEP_IOCTL_INFO: 251 return snd_hwdep_info(hw, argp); 252 case SNDRV_HWDEP_IOCTL_DSP_STATUS: 253 return snd_hwdep_dsp_status(hw, argp); 254 case SNDRV_HWDEP_IOCTL_DSP_LOAD: 255 return snd_hwdep_dsp_load(hw, argp); 256 } 257 if (hw->ops.ioctl) 258 return hw->ops.ioctl(hw, file, cmd, arg); 259 return -ENOTTY; 260 } 261 262 static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma) 263 { 264 struct snd_hwdep *hw = file->private_data; 265 if (hw->ops.mmap) 266 return hw->ops.mmap(hw, file, vma); 267 return -ENXIO; 268 } 269 270 static int snd_hwdep_control_ioctl(struct snd_card *card, 271 struct snd_ctl_file * control, 272 unsigned int cmd, unsigned long arg) 273 { 274 switch (cmd) { 275 case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE: 276 { 277 int device; 278 279 if (get_user(device, (int __user *)arg)) 280 return -EFAULT; 281 mutex_lock(®ister_mutex); 282 283 if (device < 0) 284 device = 0; 285 else if (device < SNDRV_MINOR_HWDEPS) 286 device++; 287 else 288 device = SNDRV_MINOR_HWDEPS; 289 290 while (device < SNDRV_MINOR_HWDEPS) { 291 if (snd_hwdep_search(card, device)) 292 break; 293 device++; 294 } 295 if (device >= SNDRV_MINOR_HWDEPS) 296 device = -1; 297 mutex_unlock(®ister_mutex); 298 if (put_user(device, (int __user *)arg)) 299 return -EFAULT; 300 return 0; 301 } 302 case SNDRV_CTL_IOCTL_HWDEP_INFO: 303 { 304 struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg; 305 int device, err; 306 struct snd_hwdep *hwdep; 307 308 if (get_user(device, &info->device)) 309 return -EFAULT; 310 mutex_lock(®ister_mutex); 311 hwdep = snd_hwdep_search(card, device); 312 if (hwdep) 313 err = snd_hwdep_info(hwdep, info); 314 else 315 err = -ENXIO; 316 mutex_unlock(®ister_mutex); 317 return err; 318 } 319 } 320 return -ENOIOCTLCMD; 321 } 322 323 #ifdef CONFIG_COMPAT 324 #include "hwdep_compat.c" 325 #else 326 #define snd_hwdep_ioctl_compat NULL 327 #endif 328 329 /* 330 331 */ 332 333 static const struct file_operations snd_hwdep_f_ops = 334 { 335 .owner = THIS_MODULE, 336 .llseek = snd_hwdep_llseek, 337 .read = snd_hwdep_read, 338 .write = snd_hwdep_write, 339 .open = snd_hwdep_open, 340 .release = snd_hwdep_release, 341 .poll = snd_hwdep_poll, 342 .unlocked_ioctl = snd_hwdep_ioctl, 343 .compat_ioctl = snd_hwdep_ioctl_compat, 344 .mmap = snd_hwdep_mmap, 345 }; 346 347 static void release_hwdep_device(struct device *dev) 348 { 349 kfree(container_of(dev, struct snd_hwdep, dev)); 350 } 351 352 /** 353 * snd_hwdep_new - create a new hwdep instance 354 * @card: the card instance 355 * @id: the id string 356 * @device: the device index (zero-based) 357 * @rhwdep: the pointer to store the new hwdep instance 358 * 359 * Creates a new hwdep instance with the given index on the card. 360 * The callbacks (hwdep->ops) must be set on the returned instance 361 * after this call manually by the caller. 362 * 363 * Return: Zero if successful, or a negative error code on failure. 364 */ 365 int snd_hwdep_new(struct snd_card *card, char *id, int device, 366 struct snd_hwdep **rhwdep) 367 { 368 struct snd_hwdep *hwdep; 369 int err; 370 static struct snd_device_ops ops = { 371 .dev_free = snd_hwdep_dev_free, 372 .dev_register = snd_hwdep_dev_register, 373 .dev_disconnect = snd_hwdep_dev_disconnect, 374 }; 375 376 if (snd_BUG_ON(!card)) 377 return -ENXIO; 378 if (rhwdep) 379 *rhwdep = NULL; 380 hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL); 381 if (hwdep == NULL) { 382 dev_err(card->dev, "hwdep: cannot allocate\n"); 383 return -ENOMEM; 384 } 385 386 init_waitqueue_head(&hwdep->open_wait); 387 mutex_init(&hwdep->open_mutex); 388 hwdep->card = card; 389 hwdep->device = device; 390 if (id) 391 strlcpy(hwdep->id, id, sizeof(hwdep->id)); 392 393 snd_device_initialize(&hwdep->dev, card); 394 hwdep->dev.release = release_hwdep_device; 395 dev_set_name(&hwdep->dev, "hwC%iD%i", card->number, device); 396 #ifdef CONFIG_SND_OSSEMUL 397 hwdep->oss_type = -1; 398 #endif 399 400 err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops); 401 if (err < 0) { 402 put_device(&hwdep->dev); 403 return err; 404 } 405 406 if (rhwdep) 407 *rhwdep = hwdep; 408 return 0; 409 } 410 EXPORT_SYMBOL(snd_hwdep_new); 411 412 static int snd_hwdep_dev_free(struct snd_device *device) 413 { 414 struct snd_hwdep *hwdep = device->device_data; 415 if (!hwdep) 416 return 0; 417 if (hwdep->private_free) 418 hwdep->private_free(hwdep); 419 put_device(&hwdep->dev); 420 return 0; 421 } 422 423 static int snd_hwdep_dev_register(struct snd_device *device) 424 { 425 struct snd_hwdep *hwdep = device->device_data; 426 struct snd_card *card = hwdep->card; 427 int err; 428 429 mutex_lock(®ister_mutex); 430 if (snd_hwdep_search(card, hwdep->device)) { 431 mutex_unlock(®ister_mutex); 432 return -EBUSY; 433 } 434 list_add_tail(&hwdep->list, &snd_hwdep_devices); 435 err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP, 436 hwdep->card, hwdep->device, 437 &snd_hwdep_f_ops, hwdep, &hwdep->dev); 438 if (err < 0) { 439 dev_err(&hwdep->dev, "unable to register\n"); 440 list_del(&hwdep->list); 441 mutex_unlock(®ister_mutex); 442 return err; 443 } 444 445 #ifdef CONFIG_SND_OSSEMUL 446 hwdep->ossreg = 0; 447 if (hwdep->oss_type >= 0) { 448 if (hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM && 449 hwdep->device) 450 dev_warn(&hwdep->dev, 451 "only hwdep device 0 can be registered as OSS direct FM device!\n"); 452 else if (snd_register_oss_device(hwdep->oss_type, 453 card, hwdep->device, 454 &snd_hwdep_f_ops, hwdep) < 0) 455 dev_warn(&hwdep->dev, 456 "unable to register OSS compatibility device\n"); 457 else 458 hwdep->ossreg = 1; 459 } 460 #endif 461 mutex_unlock(®ister_mutex); 462 return 0; 463 } 464 465 static int snd_hwdep_dev_disconnect(struct snd_device *device) 466 { 467 struct snd_hwdep *hwdep = device->device_data; 468 469 if (snd_BUG_ON(!hwdep)) 470 return -ENXIO; 471 mutex_lock(®ister_mutex); 472 if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) { 473 mutex_unlock(®ister_mutex); 474 return -EINVAL; 475 } 476 mutex_lock(&hwdep->open_mutex); 477 wake_up(&hwdep->open_wait); 478 #ifdef CONFIG_SND_OSSEMUL 479 if (hwdep->ossreg) 480 snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device); 481 #endif 482 snd_unregister_device(&hwdep->dev); 483 list_del_init(&hwdep->list); 484 mutex_unlock(&hwdep->open_mutex); 485 mutex_unlock(®ister_mutex); 486 return 0; 487 } 488 489 #ifdef CONFIG_PROC_FS 490 /* 491 * Info interface 492 */ 493 494 static void snd_hwdep_proc_read(struct snd_info_entry *entry, 495 struct snd_info_buffer *buffer) 496 { 497 struct snd_hwdep *hwdep; 498 499 mutex_lock(®ister_mutex); 500 list_for_each_entry(hwdep, &snd_hwdep_devices, list) 501 snd_iprintf(buffer, "%02i-%02i: %s\n", 502 hwdep->card->number, hwdep->device, hwdep->name); 503 mutex_unlock(®ister_mutex); 504 } 505 506 static struct snd_info_entry *snd_hwdep_proc_entry; 507 508 static void __init snd_hwdep_proc_init(void) 509 { 510 struct snd_info_entry *entry; 511 512 if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) { 513 entry->c.text.read = snd_hwdep_proc_read; 514 if (snd_info_register(entry) < 0) { 515 snd_info_free_entry(entry); 516 entry = NULL; 517 } 518 } 519 snd_hwdep_proc_entry = entry; 520 } 521 522 static void __exit snd_hwdep_proc_done(void) 523 { 524 snd_info_free_entry(snd_hwdep_proc_entry); 525 } 526 #else /* !CONFIG_PROC_FS */ 527 #define snd_hwdep_proc_init() 528 #define snd_hwdep_proc_done() 529 #endif /* CONFIG_PROC_FS */ 530 531 532 /* 533 * ENTRY functions 534 */ 535 536 static int __init alsa_hwdep_init(void) 537 { 538 snd_hwdep_proc_init(); 539 snd_ctl_register_ioctl(snd_hwdep_control_ioctl); 540 snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl); 541 return 0; 542 } 543 544 static void __exit alsa_hwdep_exit(void) 545 { 546 snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl); 547 snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl); 548 snd_hwdep_proc_done(); 549 } 550 551 module_init(alsa_hwdep_init) 552 module_exit(alsa_hwdep_exit) 553