sound/core/hwdep.c

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