sound/core/hwdep.c

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