sound/core/compress_offload.c

   1 /*
   2  *  compress_core.c - compress offload core
   3  *
   4  *  Copyright (C) 2011 Intel Corporation
   5  *  Authors:    Vinod Koul <vinod.koul@linux.intel.com>
   6  *              Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
   7  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; version 2 of the License.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  *
  24  */
  25 #define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__
  26 #define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt)
  27
  28 #include <linux/file.h>
  29 #include <linux/fs.h>
  30 #include <linux/list.h>
  31 #include <linux/mm.h>
  32 #include <linux/mutex.h>
  33 #include <linux/poll.h>
  34 #include <linux/slab.h>
  35 #include <linux/sched.h>
  36 #include <linux/uio.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/module.h>
  39 #include <sound/core.h>
  40 #include <sound/initval.h>
  41 #include <sound/compress_params.h>
  42 #include <sound/compress_offload.h>
  43 #include <sound/compress_driver.h>
  44
  45 /* TODO:
  46  * - add substream support for multiple devices in case of
  47  *      SND_DYNAMIC_MINORS is not used
  48  * - Multiple node representation
  49  *      driver should be able to register multiple nodes
  50  */
  51
  52 static DEFINE_MUTEX(device_mutex);
  53
  54 struct snd_compr_file {
  55         unsigned long caps;
  56         struct snd_compr_stream stream;
  57 };
  58
  59 /*
  60  * a note on stream states used:
  61  * we use follwing states in the compressed core
  62  * SNDRV_PCM_STATE_OPEN: When stream has been opened.
  63  * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
  64  *      calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this
  65  *      state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
  66  * SNDRV_PCM_STATE_RUNNING: When stream has been started and is
  67  *      decoding/encoding and rendering/capturing data.
  68  * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
  69  *      by calling SNDRV_COMPRESS_DRAIN.
  70  * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
  71  *      SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
  72  *      SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
  73  */
  74 static int snd_compr_open(struct inode *inode, struct file *f)
  75 {
  76         struct snd_compr *compr;
  77         struct snd_compr_file *data;
  78         struct snd_compr_runtime *runtime;
  79         enum snd_compr_direction dirn;
  80         int maj = imajor(inode);
  81         int ret;
  82
  83         if ((f->f_flags & O_ACCMODE) == O_WRONLY)
  84                 dirn = SND_COMPRESS_PLAYBACK;
  85         else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
  86                 dirn = SND_COMPRESS_CAPTURE;
  87         else
  88                 return -EINVAL;
  89
  90         if (maj == snd_major)
  91                 compr = snd_lookup_minor_data(iminor(inode),
  92                                         SNDRV_DEVICE_TYPE_COMPRESS);
  93         else
  94                 return -EBADFD;
  95
  96         if (compr == NULL) {
  97                 pr_err("no device data!!!\n");
  98                 return -ENODEV;
  99         }
 100
 101         if (dirn != compr->direction) {
 102                 pr_err("this device doesn't support this direction\n");
 103                 snd_card_unref(compr->card);
 104                 return -EINVAL;
 105         }
 106
 107         data = kzalloc(sizeof(*data), GFP_KERNEL);
 108         if (!data) {
 109                 snd_card_unref(compr->card);
 110                 return -ENOMEM;
 111         }
 112         data->stream.ops = compr->ops;
 113         data->stream.direction = dirn;
 114         data->stream.private_data = compr->private_data;
 115         data->stream.device = compr;
 116         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 117         if (!runtime) {
 118                 kfree(data);
 119                 snd_card_unref(compr->card);
 120                 return -ENOMEM;
 121         }
 122         runtime->state = SNDRV_PCM_STATE_OPEN;
 123         init_waitqueue_head(&runtime->sleep);
 124         data->stream.runtime = runtime;
 125         f->private_data = (void *)data;
 126         mutex_lock(&compr->lock);
 127         ret = compr->ops->open(&data->stream);
 128         mutex_unlock(&compr->lock);
 129         if (ret) {
 130                 kfree(runtime);
 131                 kfree(data);
 132         }
 133         snd_card_unref(compr->card);
 134         return 0;
 135 }
 136
 137 static int snd_compr_free(struct inode *inode, struct file *f)
 138 {
 139         struct snd_compr_file *data = f->private_data;
 140         data->stream.ops->free(&data->stream);
 141         kfree(data->stream.runtime->buffer);
 142         kfree(data->stream.runtime);
 143         kfree(data);
 144         return 0;
 145 }
 146
 147 static void snd_compr_update_tstamp(struct snd_compr_stream *stream,
 148                 struct snd_compr_tstamp *tstamp)
 149 {
 150         if (!stream->ops->pointer)
 151                 return;
 152         stream->ops->pointer(stream, tstamp);
 153         pr_debug("dsp consumed till %d total %d bytes\n",
 154                 tstamp->byte_offset, tstamp->copied_total);
 155         stream->runtime->hw_pointer = tstamp->byte_offset;
 156         stream->runtime->total_bytes_transferred = tstamp->copied_total;
 157 }
 158
 159 static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
 160                 struct snd_compr_avail *avail)
 161 {
 162         long avail_calc; /*this needs to be signed variable */
 163
 164         snd_compr_update_tstamp(stream, &avail->tstamp);
 165
 166         /* FIXME: This needs to be different for capture stream,
 167            available is # of compressed data, for playback it's
 168            remainder of buffer */
 169
 170         if (stream->runtime->total_bytes_available == 0 &&
 171                         stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
 172                 pr_debug("detected init and someone forgot to do a write\n");
 173                 return stream->runtime->buffer_size;
 174         }
 175         pr_debug("app wrote %lld, DSP consumed %lld\n",
 176                         stream->runtime->total_bytes_available,
 177                         stream->runtime->total_bytes_transferred);
 178         if (stream->runtime->total_bytes_available ==
 179                                 stream->runtime->total_bytes_transferred) {
 180                 pr_debug("both pointers are same, returning full avail\n");
 181                 return stream->runtime->buffer_size;
 182         }
 183
 184         /* FIXME: this routine isn't consistent, in one test we use
 185          * cumulative values and in the other byte offsets. Do we
 186          * really need the byte offsets if the cumulative values have
 187          * been updated? In the PCM interface app_ptr and hw_ptr are
 188          * already cumulative */
 189
 190         avail_calc = stream->runtime->buffer_size -
 191                 (stream->runtime->app_pointer - stream->runtime->hw_pointer);
 192         pr_debug("calc avail as %ld, app_ptr %lld, hw+ptr %lld\n", avail_calc,
 193                         stream->runtime->app_pointer,
 194                         stream->runtime->hw_pointer);
 195         if (avail_calc >= stream->runtime->buffer_size)
 196                 avail_calc -= stream->runtime->buffer_size;
 197         pr_debug("ret avail as %ld\n", avail_calc);
 198         avail->avail = avail_calc;
 199         return avail_calc;
 200 }
 201
 202 static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
 203 {
 204         struct snd_compr_avail avail;
 205
 206         return snd_compr_calc_avail(stream, &avail);
 207 }
 208
 209 static int
 210 snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
 211 {
 212         struct snd_compr_avail ioctl_avail;
 213         size_t avail;
 214
 215         avail = snd_compr_calc_avail(stream, &ioctl_avail);
 216         ioctl_avail.avail = avail;
 217
 218         if (copy_to_user((__u64 __user *)arg,
 219                                 &ioctl_avail, sizeof(ioctl_avail)))
 220                 return -EFAULT;
 221         return 0;
 222 }
 223
 224 static int snd_compr_write_data(struct snd_compr_stream *stream,
 225                const char __user *buf, size_t count)
 226 {
 227         void *dstn;
 228         size_t copy;
 229         struct snd_compr_runtime *runtime = stream->runtime;
 230
 231         dstn = runtime->buffer + runtime->app_pointer;
 232         pr_debug("copying %ld at %lld\n",
 233                         (unsigned long)count, runtime->app_pointer);
 234         if (count < runtime->buffer_size - runtime->app_pointer) {
 235                 if (copy_from_user(dstn, buf, count))
 236                         return -EFAULT;
 237                 runtime->app_pointer += count;
 238         } else {
 239                 copy = runtime->buffer_size - runtime->app_pointer;
 240                 if (copy_from_user(dstn, buf, copy))
 241                         return -EFAULT;
 242                 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
 243                         return -EFAULT;
 244                 runtime->app_pointer = count - copy;
 245         }
 246         /* if DSP cares, let it know data has been written */
 247         if (stream->ops->ack)
 248                 stream->ops->ack(stream, count);
 249         return count;
 250 }
 251
 252 static ssize_t snd_compr_write(struct file *f, const char __user *buf,
 253                 size_t count, loff_t *offset)
 254 {
 255         struct snd_compr_file *data = f->private_data;
 256         struct snd_compr_stream *stream;
 257         size_t avail;
 258         int retval;
 259
 260         if (snd_BUG_ON(!data))
 261                 return -EFAULT;
 262
 263         stream = &data->stream;
 264         mutex_lock(&stream->device->lock);
 265         /* write is allowed when stream is running or has been steup */
 266         if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
 267                         stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
 268                 mutex_unlock(&stream->device->lock);
 269                 return -EBADFD;
 270         }
 271
 272         avail = snd_compr_get_avail(stream);
 273         pr_debug("avail returned %ld\n", (unsigned long)avail);
 274         /* calculate how much we can write to buffer */
 275         if (avail > count)
 276                 avail = count;
 277
 278         if (stream->ops->copy)
 279                 retval = stream->ops->copy(stream, buf, avail);
 280         else
 281                 retval = snd_compr_write_data(stream, buf, avail);
 282         if (retval > 0)
 283                 stream->runtime->total_bytes_available += retval;
 284
 285         /* while initiating the stream, write should be called before START
 286          * call, so in setup move state */
 287         if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
 288                 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
 289                 pr_debug("stream prepared, Houston we are good to go\n");
 290         }
 291
 292         mutex_unlock(&stream->device->lock);
 293         return retval;
 294 }
 295
 296
 297 static ssize_t snd_compr_read(struct file *f, char __user *buf,
 298                 size_t count, loff_t *offset)
 299 {
 300         return -ENXIO;
 301 }
 302
 303 static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
 304 {
 305         return -ENXIO;
 306 }
 307
 308 static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
 309 {
 310         if (stream->direction == SND_COMPRESS_PLAYBACK)
 311                 return POLLOUT | POLLWRNORM;
 312         else
 313                 return POLLIN | POLLRDNORM;
 314 }
 315
 316 static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
 317 {
 318         struct snd_compr_file *data = f->private_data;
 319         struct snd_compr_stream *stream;
 320         size_t avail;
 321         int retval = 0;
 322
 323         if (snd_BUG_ON(!data))
 324                 return -EFAULT;
 325         stream = &data->stream;
 326         if (snd_BUG_ON(!stream))
 327                 return -EFAULT;
 328
 329         mutex_lock(&stream->device->lock);
 330         if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
 331                         stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
 332                 retval = -EBADFD;
 333                 goto out;
 334         }
 335         poll_wait(f, &stream->runtime->sleep, wait);
 336
 337         avail = snd_compr_get_avail(stream);
 338         pr_debug("avail is %ld\n", (unsigned long)avail);
 339         /* check if we have at least one fragment to fill */
 340         switch (stream->runtime->state) {
 341         case SNDRV_PCM_STATE_DRAINING:
 342                 /* stream has been woken up after drain is complete
 343                  * draining done so set stream state to stopped
 344                  */
 345                 retval = snd_compr_get_poll(stream);
 346                 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
 347                 break;
 348         case SNDRV_PCM_STATE_RUNNING:
 349         case SNDRV_PCM_STATE_PREPARED:
 350         case SNDRV_PCM_STATE_PAUSED:
 351                 if (avail >= stream->runtime->fragment_size)
 352                         retval = snd_compr_get_poll(stream);
 353                 break;
 354         default:
 355                 if (stream->direction == SND_COMPRESS_PLAYBACK)
 356                         retval = POLLOUT | POLLWRNORM | POLLERR;
 357                 else
 358                         retval = POLLIN | POLLRDNORM | POLLERR;
 359                 break;
 360         }
 361 out:
 362         mutex_unlock(&stream->device->lock);
 363         return retval;
 364 }
 365
 366 static int
 367 snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
 368 {
 369         int retval;
 370         struct snd_compr_caps caps;
 371
 372         if (!stream->ops->get_caps)
 373                 return -ENXIO;
 374
 375         retval = stream->ops->get_caps(stream, &caps);
 376         if (retval)
 377                 goto out;
 378         if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
 379                 retval = -EFAULT;
 380 out:
 381         return retval;
 382 }
 383
 384 static int
 385 snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
 386 {
 387         int retval;
 388         struct snd_compr_codec_caps *caps;
 389
 390         if (!stream->ops->get_codec_caps)
 391                 return -ENXIO;
 392
 393         caps = kmalloc(sizeof(*caps), GFP_KERNEL);
 394         if (!caps)
 395                 return -ENOMEM;
 396
 397         retval = stream->ops->get_codec_caps(stream, caps);
 398         if (retval)
 399                 goto out;
 400         if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
 401                 retval = -EFAULT;
 402
 403 out:
 404         kfree(caps);
 405         return retval;
 406 }
 407
 408 /* revisit this with snd_pcm_preallocate_xxx */
 409 static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
 410                 struct snd_compr_params *params)
 411 {
 412         unsigned int buffer_size;
 413         void *buffer;
 414
 415         buffer_size = params->buffer.fragment_size * params->buffer.fragments;
 416         if (stream->ops->copy) {
 417                 buffer = NULL;
 418                 /* if copy is defined the driver will be required to copy
 419                  * the data from core
 420                  */
 421         } else {
 422                 buffer = kmalloc(buffer_size, GFP_KERNEL);
 423                 if (!buffer)
 424                         return -ENOMEM;
 425         }
 426         stream->runtime->fragment_size = params->buffer.fragment_size;
 427         stream->runtime->fragments = params->buffer.fragments;
 428         stream->runtime->buffer = buffer;
 429         stream->runtime->buffer_size = buffer_size;
 430         return 0;
 431 }
 432
 433 static int snd_compress_check_input(struct snd_compr_params *params)
 434 {
 435         /* first let's check the buffer parameter's */
 436         if (params->buffer.fragment_size == 0 ||
 437                         params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
 438                 return -EINVAL;
 439
 440         /* now codec parameters */
 441         if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
 442                 return -EINVAL;
 443
 444         if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
 445                 return -EINVAL;
 446
 447         if (!(params->codec.sample_rate & SNDRV_PCM_RATE_8000_192000))
 448                 return -EINVAL;
 449
 450         return 0;
 451 }
 452
 453 static int
 454 snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
 455 {
 456         struct snd_compr_params *params;
 457         int retval;
 458
 459         if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
 460                 /*
 461                  * we should allow parameter change only when stream has been
 462                  * opened not in other cases
 463                  */
 464                 params = kmalloc(sizeof(*params), GFP_KERNEL);
 465                 if (!params)
 466                         return -ENOMEM;
 467                 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
 468                         retval = -EFAULT;
 469                         goto out;
 470                 }
 471
 472                 retval = snd_compress_check_input(params);
 473                 if (retval)
 474                         goto out;
 475
 476                 retval = snd_compr_allocate_buffer(stream, params);
 477                 if (retval) {
 478                         retval = -ENOMEM;
 479                         goto out;
 480                 }
 481
 482                 retval = stream->ops->set_params(stream, params);
 483                 if (retval)
 484                         goto out;
 485                 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
 486         } else {
 487                 return -EPERM;
 488         }
 489 out:
 490         kfree(params);
 491         return retval;
 492 }
 493
 494 static int
 495 snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
 496 {
 497         struct snd_codec *params;
 498         int retval;
 499
 500         if (!stream->ops->get_params)
 501                 return -EBADFD;
 502
 503         params = kmalloc(sizeof(*params), GFP_KERNEL);
 504         if (!params)
 505                 return -ENOMEM;
 506         retval = stream->ops->get_params(stream, params);
 507         if (retval)
 508                 goto out;
 509         if (copy_to_user((char __user *)arg, params, sizeof(*params)))
 510                 retval = -EFAULT;
 511
 512 out:
 513         kfree(params);
 514         return retval;
 515 }
 516
 517 static inline int
 518 snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
 519 {
 520         struct snd_compr_tstamp tstamp;
 521
 522         snd_compr_update_tstamp(stream, &tstamp);
 523         return copy_to_user((struct snd_compr_tstamp __user *)arg,
 524                 &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
 525 }
 526
 527 static int snd_compr_pause(struct snd_compr_stream *stream)
 528 {
 529         int retval;
 530
 531         if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
 532                 return -EPERM;
 533         retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
 534         if (!retval)
 535                 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
 536         return retval;
 537 }
 538
 539 static int snd_compr_resume(struct snd_compr_stream *stream)
 540 {
 541         int retval;
 542
 543         if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
 544                 return -EPERM;
 545         retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 546         if (!retval)
 547                 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
 548         return retval;
 549 }
 550
 551 static int snd_compr_start(struct snd_compr_stream *stream)
 552 {
 553         int retval;
 554
 555         if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
 556                 return -EPERM;
 557         retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
 558         if (!retval)
 559                 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
 560         return retval;
 561 }
 562
 563 static int snd_compr_stop(struct snd_compr_stream *stream)
 564 {
 565         int retval;
 566
 567         if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
 568                         stream->runtime->state == SNDRV_PCM_STATE_SETUP)
 569                 return -EPERM;
 570         retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
 571         if (!retval) {
 572                 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
 573                 wake_up(&stream->runtime->sleep);
 574                 stream->runtime->hw_pointer = 0;
 575                 stream->runtime->app_pointer = 0;
 576                 stream->runtime->total_bytes_available = 0;
 577                 stream->runtime->total_bytes_transferred = 0;
 578         }
 579         return retval;
 580 }
 581
 582 static int snd_compr_drain(struct snd_compr_stream *stream)
 583 {
 584         int retval;
 585
 586         if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
 587                         stream->runtime->state == SNDRV_PCM_STATE_SETUP)
 588                 return -EPERM;
 589         retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
 590         if (!retval) {
 591                 stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
 592                 wake_up(&stream->runtime->sleep);
 593         }
 594         return retval;
 595 }
 596
 597 static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 598 {
 599         struct snd_compr_file *data = f->private_data;
 600         struct snd_compr_stream *stream;
 601         int retval = -ENOTTY;
 602
 603         if (snd_BUG_ON(!data))
 604                 return -EFAULT;
 605         stream = &data->stream;
 606         if (snd_BUG_ON(!stream))
 607                 return -EFAULT;
 608         mutex_lock(&stream->device->lock);
 609         switch (_IOC_NR(cmd)) {
 610         case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
 611                 put_user(SNDRV_COMPRESS_VERSION,
 612                                 (int __user *)arg) ? -EFAULT : 0;
 613                 break;
 614         case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
 615                 retval = snd_compr_get_caps(stream, arg);
 616                 break;
 617         case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
 618                 retval = snd_compr_get_codec_caps(stream, arg);
 619                 break;
 620         case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
 621                 retval = snd_compr_set_params(stream, arg);
 622                 break;
 623         case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
 624                 retval = snd_compr_get_params(stream, arg);
 625                 break;
 626         case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
 627                 retval = snd_compr_tstamp(stream, arg);
 628                 break;
 629         case _IOC_NR(SNDRV_COMPRESS_AVAIL):
 630                 retval = snd_compr_ioctl_avail(stream, arg);
 631                 break;
 632         case _IOC_NR(SNDRV_COMPRESS_PAUSE):
 633                 retval = snd_compr_pause(stream);
 634                 break;
 635         case _IOC_NR(SNDRV_COMPRESS_RESUME):
 636                 retval = snd_compr_resume(stream);
 637                 break;
 638         case _IOC_NR(SNDRV_COMPRESS_START):
 639                 retval = snd_compr_start(stream);
 640                 break;
 641         case _IOC_NR(SNDRV_COMPRESS_STOP):
 642                 retval = snd_compr_stop(stream);
 643                 break;
 644         case _IOC_NR(SNDRV_COMPRESS_DRAIN):
 645                 retval = snd_compr_drain(stream);
 646                 break;
 647         }
 648         mutex_unlock(&stream->device->lock);
 649         return retval;
 650 }
 651
 652 static const struct file_operations snd_compr_file_ops = {
 653                 .owner =        THIS_MODULE,
 654                 .open =         snd_compr_open,
 655                 .release =      snd_compr_free,
 656                 .write =        snd_compr_write,
 657                 .read =         snd_compr_read,
 658                 .unlocked_ioctl = snd_compr_ioctl,
 659                 .mmap =         snd_compr_mmap,
 660                 .poll =         snd_compr_poll,
 661 };
 662
 663 static int snd_compress_dev_register(struct snd_device *device)
 664 {
 665         int ret = -EINVAL;
 666         char str[16];
 667         struct snd_compr *compr;
 668
 669         if (snd_BUG_ON(!device || !device->device_data))
 670                 return -EBADFD;
 671         compr = device->device_data;
 672
 673         sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
 674         pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
 675                         compr->direction);
 676         /* register compressed device */
 677         ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
 678                         compr->device, &snd_compr_file_ops, compr, str);
 679         if (ret < 0) {
 680                 pr_err("snd_register_device failed\n %d", ret);
 681                 return ret;
 682         }
 683         return ret;
 684
 685 }
 686
 687 static int snd_compress_dev_disconnect(struct snd_device *device)
 688 {
 689         struct snd_compr *compr;
 690
 691         compr = device->device_data;
 692         snd_unregister_device(compr->direction, compr->card, compr->device);
 693         return 0;
 694 }
 695
 696 /*
 697  * snd_compress_new: create new compress device
 698  * @card: sound card pointer
 699  * @device: device number
 700  * @dirn: device direction, should be of type enum snd_compr_direction
 701  * @compr: compress device pointer
 702  */
 703 int snd_compress_new(struct snd_card *card, int device,
 704                         int dirn, struct snd_compr *compr)
 705 {
 706         static struct snd_device_ops ops = {
 707                 .dev_free = NULL,
 708                 .dev_register = snd_compress_dev_register,
 709                 .dev_disconnect = snd_compress_dev_disconnect,
 710         };
 711
 712         compr->card = card;
 713         compr->device = device;
 714         compr->direction = dirn;
 715         return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
 716 }
 717 EXPORT_SYMBOL_GPL(snd_compress_new);
 718
 719 static int snd_compress_add_device(struct snd_compr *device)
 720 {
 721         int ret;
 722
 723         if (!device->card)
 724                 return -EINVAL;
 725
 726         /* register the card */
 727         ret = snd_card_register(device->card);
 728         if (ret)
 729                 goto out;
 730         return 0;
 731
 732 out:
 733         pr_err("failed with %d\n", ret);
 734         return ret;
 735
 736 }
 737
 738 static int snd_compress_remove_device(struct snd_compr *device)
 739 {
 740         return snd_card_free(device->card);
 741 }
 742
 743 /**
 744  * snd_compress_register - register compressed device
 745  *
 746  * @device: compressed device to register
 747  */
 748 int snd_compress_register(struct snd_compr *device)
 749 {
 750         int retval;
 751
 752         if (device->name == NULL || device->dev == NULL || device->ops == NULL)
 753                 return -EINVAL;
 754
 755         pr_debug("Registering compressed device %s\n", device->name);
 756         if (snd_BUG_ON(!device->ops->open))
 757                 return -EINVAL;
 758         if (snd_BUG_ON(!device->ops->free))
 759                 return -EINVAL;
 760         if (snd_BUG_ON(!device->ops->set_params))
 761                 return -EINVAL;
 762         if (snd_BUG_ON(!device->ops->trigger))
 763                 return -EINVAL;
 764
 765         mutex_init(&device->lock);
 766
 767         /* register a compressed card */
 768         mutex_lock(&device_mutex);
 769         retval = snd_compress_add_device(device);
 770         mutex_unlock(&device_mutex);
 771         return retval;
 772 }
 773 EXPORT_SYMBOL_GPL(snd_compress_register);
 774
 775 int snd_compress_deregister(struct snd_compr *device)
 776 {
 777         pr_debug("Removing compressed device %s\n", device->name);
 778         mutex_lock(&device_mutex);
 779         snd_compress_remove_device(device);
 780         mutex_unlock(&device_mutex);
 781         return 0;
 782 }
 783 EXPORT_SYMBOL_GPL(snd_compress_deregister);
 784
 785 static int __init snd_compress_init(void)
 786 {
 787         return 0;
 788 }
 789
 790 static void __exit snd_compress_exit(void)
 791 {
 792 }
 793
 794 module_init(snd_compress_init);
 795 module_exit(snd_compress_exit);
 796
 797 MODULE_DESCRIPTION("ALSA Compressed offload framework");
 798 MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
 799 MODULE_LICENSE("GPL v2");