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