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