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/math64.h>
  32 #include <linux/mm.h>
  33 #include <linux/mutex.h>
  34 #include <linux/poll.h>
  35 #include <linux/slab.h>
  36 #include <linux/sched.h>
  37 #include <linux/types.h>
  38 #include <linux/uio.h>
  39 #include <linux/uaccess.h>
  40 #include <linux/module.h>
  41 #include <linux/compat.h>
  42 #include <sound/core.h>
  43 #include <sound/initval.h>
  44 #include <sound/info.h>
  45 #include <sound/compress_params.h>
  46 #include <sound/compress_offload.h>
  47 #include <sound/compress_driver.h>
  48
  49 /* struct snd_compr_codec_caps overflows the ioctl bit size for some
  50  * architectures, so we need to disable the relevant ioctls.
  51  */
  52 #if _IOC_SIZEBITS < 14
  53 #define COMPR_CODEC_CAPS_OVERFLOW
  54 #endif
  55
  56 /* TODO:
  57  * - add substream support for multiple devices in case of
  58  *      SND_DYNAMIC_MINORS is not used
  59  * - Multiple node representation
  60  *      driver should be able to register multiple nodes
  61  */
  62
  63 static DEFINE_MUTEX(device_mutex);
  64
  65 struct snd_compr_file {
  66         unsigned long caps;
  67         struct snd_compr_stream stream;
  68 };
  69
  70 static void error_delayed_work(struct work_struct *work);
  71
  72 /*
  73  * a note on stream states used:
  74  * we use following states in the compressed core
  75  * SNDRV_PCM_STATE_OPEN: When stream has been opened.
  76  * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
  77  *      calling SNDRV_COMPRESS_SET_PARAMS. Running streams will come to this
  78  *      state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
  79  * SNDRV_PCM_STATE_PREPARED: When a stream has been written to (for
  80  *      playback only). User after setting up stream writes the data buffer
  81  *      before starting the stream.
  82  * SNDRV_PCM_STATE_RUNNING: When stream has been started and is
  83  *      decoding/encoding and rendering/capturing data.
  84  * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
  85  *      by calling SNDRV_COMPRESS_DRAIN.
  86  * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
  87  *      SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
  88  *      SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
  89  */
  90 static int snd_compr_open(struct inode *inode, struct file *f)
  91 {
  92         struct snd_compr *compr;
  93         struct snd_compr_file *data;
  94         struct snd_compr_runtime *runtime;
  95         enum snd_compr_direction dirn;
  96         int maj = imajor(inode);
  97         int ret;
  98
  99         if ((f->f_flags & O_ACCMODE) == O_WRONLY)
 100                 dirn = SND_COMPRESS_PLAYBACK;
 101         else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
 102                 dirn = SND_COMPRESS_CAPTURE;
 103         else
 104                 return -EINVAL;
 105
 106         if (maj == snd_major)
 107                 compr = snd_lookup_minor_data(iminor(inode),
 108                                         SNDRV_DEVICE_TYPE_COMPRESS);
 109         else
 110                 return -EBADFD;
 111
 112         if (compr == NULL) {
 113                 pr_err("no device data!!!\n");
 114                 return -ENODEV;
 115         }
 116
 117         if (dirn != compr->direction) {
 118                 pr_err("this device doesn't support this direction\n");
 119                 snd_card_unref(compr->card);
 120                 return -EINVAL;
 121         }
 122
 123         data = kzalloc(sizeof(*data), GFP_KERNEL);
 124         if (!data) {
 125                 snd_card_unref(compr->card);
 126                 return -ENOMEM;
 127         }
 128
 129         INIT_DELAYED_WORK(&data->stream.error_work, error_delayed_work);
 130
 131         data->stream.ops = compr->ops;
 132         data->stream.direction = dirn;
 133         data->stream.private_data = compr->private_data;
 134         data->stream.device = compr;
 135         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 136         if (!runtime) {
 137                 kfree(data);
 138                 snd_card_unref(compr->card);
 139                 return -ENOMEM;
 140         }
 141         runtime->state = SNDRV_PCM_STATE_OPEN;
 142         init_waitqueue_head(&runtime->sleep);
 143         data->stream.runtime = runtime;
 144         f->private_data = (void *)data;
 145         mutex_lock(&compr->lock);
 146         ret = compr->ops->open(&data->stream);
 147         mutex_unlock(&compr->lock);
 148         if (ret) {
 149                 kfree(runtime);
 150                 kfree(data);
 151         }
 152         snd_card_unref(compr->card);
 153         return ret;
 154 }
 155
 156 static int snd_compr_free(struct inode *inode, struct file *f)
 157 {
 158         struct snd_compr_file *data = f->private_data;
 159         struct snd_compr_runtime *runtime = data->stream.runtime;
 160
 161         cancel_delayed_work_sync(&data->stream.error_work);
 162
 163         switch (runtime->state) {
 164         case SNDRV_PCM_STATE_RUNNING:
 165         case SNDRV_PCM_STATE_DRAINING:
 166         case SNDRV_PCM_STATE_PAUSED:
 167                 data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP);
 168                 break;
 169         default:
 170                 break;
 171         }
 172
 173         data->stream.ops->free(&data->stream);
 174         kfree(data->stream.runtime->buffer);
 175         kfree(data->stream.runtime);
 176         kfree(data);
 177         return 0;
 178 }
 179
 180 static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
 181                 struct snd_compr_tstamp *tstamp)
 182 {
 183         if (!stream->ops->pointer)
 184                 return -ENOTSUPP;
 185         stream->ops->pointer(stream, tstamp);
 186         pr_debug("dsp consumed till %d total %d bytes\n",
 187                 tstamp->byte_offset, tstamp->copied_total);
 188         if (stream->direction == SND_COMPRESS_PLAYBACK)
 189                 stream->runtime->total_bytes_transferred = tstamp->copied_total;
 190         else
 191                 stream->runtime->total_bytes_available = tstamp->copied_total;
 192         return 0;
 193 }
 194
 195 static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
 196                 struct snd_compr_avail *avail)
 197 {
 198         memset(avail, 0, sizeof(*avail));
 199         snd_compr_update_tstamp(stream, &avail->tstamp);
 200         /* Still need to return avail even if tstamp can't be filled in */
 201
 202         if (stream->runtime->total_bytes_available == 0 &&
 203                         stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
 204                         stream->direction == SND_COMPRESS_PLAYBACK) {
 205                 pr_debug("detected init and someone forgot to do a write\n");
 206                 return stream->runtime->buffer_size;
 207         }
 208         pr_debug("app wrote %lld, DSP consumed %lld\n",
 209                         stream->runtime->total_bytes_available,
 210                         stream->runtime->total_bytes_transferred);
 211         if (stream->runtime->total_bytes_available ==
 212                                 stream->runtime->total_bytes_transferred) {
 213                 if (stream->direction == SND_COMPRESS_PLAYBACK) {
 214                         pr_debug("both pointers are same, returning full avail\n");
 215                         return stream->runtime->buffer_size;
 216                 } else {
 217                         pr_debug("both pointers are same, returning no avail\n");
 218                         return 0;
 219                 }
 220         }
 221
 222         avail->avail = stream->runtime->total_bytes_available -
 223                         stream->runtime->total_bytes_transferred;
 224         if (stream->direction == SND_COMPRESS_PLAYBACK)
 225                 avail->avail = stream->runtime->buffer_size - avail->avail;
 226
 227         pr_debug("ret avail as %lld\n", avail->avail);
 228         return avail->avail;
 229 }
 230
 231 static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
 232 {
 233         struct snd_compr_avail avail;
 234
 235         return snd_compr_calc_avail(stream, &avail);
 236 }
 237
 238 static int
 239 snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
 240 {
 241         struct snd_compr_avail ioctl_avail;
 242         size_t avail;
 243
 244         avail = snd_compr_calc_avail(stream, &ioctl_avail);
 245         ioctl_avail.avail = avail;
 246
 247         switch (stream->runtime->state) {
 248         case SNDRV_PCM_STATE_OPEN:
 249                 return -EBADFD;
 250         case SNDRV_PCM_STATE_XRUN:
 251                 return -EPIPE;
 252         default:
 253                 break;
 254         }
 255
 256         if (copy_to_user((__u64 __user *)arg,
 257                                 &ioctl_avail, sizeof(ioctl_avail)))
 258                 return -EFAULT;
 259         return 0;
 260 }
 261
 262 static int snd_compr_write_data(struct snd_compr_stream *stream,
 263                const char __user *buf, size_t count)
 264 {
 265         void *dstn;
 266         size_t copy;
 267         struct snd_compr_runtime *runtime = stream->runtime;
 268         /* 64-bit Modulus */
 269         u64 app_pointer = div64_u64(runtime->total_bytes_available,
 270                                     runtime->buffer_size);
 271         app_pointer = runtime->total_bytes_available -
 272                       (app_pointer * runtime->buffer_size);
 273
 274         dstn = runtime->buffer + app_pointer;
 275         pr_debug("copying %ld at %lld\n",
 276                         (unsigned long)count, app_pointer);
 277         if (count < runtime->buffer_size - app_pointer) {
 278                 if (copy_from_user(dstn, buf, count))
 279                         return -EFAULT;
 280         } else {
 281                 copy = runtime->buffer_size - app_pointer;
 282                 if (copy_from_user(dstn, buf, copy))
 283                         return -EFAULT;
 284                 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
 285                         return -EFAULT;
 286         }
 287         /* if DSP cares, let it know data has been written */
 288         if (stream->ops->ack)
 289                 stream->ops->ack(stream, count);
 290         return count;
 291 }
 292
 293 static ssize_t snd_compr_write(struct file *f, const char __user *buf,
 294                 size_t count, loff_t *offset)
 295 {
 296         struct snd_compr_file *data = f->private_data;
 297         struct snd_compr_stream *stream;
 298         size_t avail;
 299         int retval;
 300
 301         if (snd_BUG_ON(!data))
 302                 return -EFAULT;
 303
 304         stream = &data->stream;
 305         mutex_lock(&stream->device->lock);
 306         /* write is allowed when stream is running or has been steup */
 307         switch (stream->runtime->state) {
 308         case SNDRV_PCM_STATE_SETUP:
 309         case SNDRV_PCM_STATE_PREPARED:
 310         case SNDRV_PCM_STATE_RUNNING:
 311                 break;
 312         default:
 313                 mutex_unlock(&stream->device->lock);
 314                 return -EBADFD;
 315         }
 316
 317         avail = snd_compr_get_avail(stream);
 318         pr_debug("avail returned %ld\n", (unsigned long)avail);
 319         /* calculate how much we can write to buffer */
 320         if (avail > count)
 321                 avail = count;
 322
 323         if (stream->ops->copy) {
 324                 char __user* cbuf = (char __user*)buf;
 325                 retval = stream->ops->copy(stream, cbuf, avail);
 326         } else {
 327                 retval = snd_compr_write_data(stream, buf, avail);
 328         }
 329         if (retval > 0)
 330                 stream->runtime->total_bytes_available += retval;
 331
 332         /* while initiating the stream, write should be called before START
 333          * call, so in setup move state */
 334         if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
 335                 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
 336                 pr_debug("stream prepared, Houston we are good to go\n");
 337         }
 338
 339         mutex_unlock(&stream->device->lock);
 340         return retval;
 341 }
 342
 343
 344 static ssize_t snd_compr_read(struct file *f, char __user *buf,
 345                 size_t count, loff_t *offset)
 346 {
 347         struct snd_compr_file *data = f->private_data;
 348         struct snd_compr_stream *stream;
 349         size_t avail;
 350         int retval;
 351
 352         if (snd_BUG_ON(!data))
 353                 return -EFAULT;
 354
 355         stream = &data->stream;
 356         mutex_lock(&stream->device->lock);
 357
 358         /* read is allowed when stream is running, paused, draining and setup
 359          * (yes setup is state which we transition to after stop, so if user
 360          * wants to read data after stop we allow that)
 361          */
 362         switch (stream->runtime->state) {
 363         case SNDRV_PCM_STATE_OPEN:
 364         case SNDRV_PCM_STATE_PREPARED:
 365         case SNDRV_PCM_STATE_SUSPENDED:
 366         case SNDRV_PCM_STATE_DISCONNECTED:
 367                 retval = -EBADFD;
 368                 goto out;
 369         case SNDRV_PCM_STATE_XRUN:
 370                 retval = -EPIPE;
 371                 goto out;
 372         }
 373
 374         avail = snd_compr_get_avail(stream);
 375         pr_debug("avail returned %ld\n", (unsigned long)avail);
 376         /* calculate how much we can read from buffer */
 377         if (avail > count)
 378                 avail = count;
 379
 380         if (stream->ops->copy) {
 381                 retval = stream->ops->copy(stream, buf, avail);
 382         } else {
 383                 retval = -ENXIO;
 384                 goto out;
 385         }
 386         if (retval > 0)
 387                 stream->runtime->total_bytes_transferred += retval;
 388
 389 out:
 390         mutex_unlock(&stream->device->lock);
 391         return retval;
 392 }
 393
 394 static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
 395 {
 396         return -ENXIO;
 397 }
 398
 399 static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
 400 {
 401         if (stream->direction == SND_COMPRESS_PLAYBACK)
 402                 return POLLOUT | POLLWRNORM;
 403         else
 404                 return POLLIN | POLLRDNORM;
 405 }
 406
 407 static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
 408 {
 409         struct snd_compr_file *data = f->private_data;
 410         struct snd_compr_stream *stream;
 411         size_t avail;
 412         int retval = 0;
 413
 414         if (snd_BUG_ON(!data))
 415                 return POLLERR;
 416
 417         stream = &data->stream;
 418
 419         mutex_lock(&stream->device->lock);
 420
 421         switch (stream->runtime->state) {
 422         case SNDRV_PCM_STATE_OPEN:
 423         case SNDRV_PCM_STATE_XRUN:
 424                 retval = snd_compr_get_poll(stream) | POLLERR;
 425                 goto out;
 426         default:
 427                 break;
 428         }
 429
 430         poll_wait(f, &stream->runtime->sleep, wait);
 431
 432         avail = snd_compr_get_avail(stream);
 433         pr_debug("avail is %ld\n", (unsigned long)avail);
 434         /* check if we have at least one fragment to fill */
 435         switch (stream->runtime->state) {
 436         case SNDRV_PCM_STATE_DRAINING:
 437                 /* stream has been woken up after drain is complete
 438                  * draining done so set stream state to stopped
 439                  */
 440                 retval = snd_compr_get_poll(stream);
 441                 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
 442                 break;
 443         case SNDRV_PCM_STATE_RUNNING:
 444         case SNDRV_PCM_STATE_PREPARED:
 445         case SNDRV_PCM_STATE_PAUSED:
 446                 if (avail >= stream->runtime->fragment_size)
 447                         retval = snd_compr_get_poll(stream);
 448                 break;
 449         default:
 450                 retval = snd_compr_get_poll(stream) | POLLERR;
 451                 break;
 452         }
 453 out:
 454         mutex_unlock(&stream->device->lock);
 455         return retval;
 456 }
 457
 458 static int
 459 snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
 460 {
 461         int retval;
 462         struct snd_compr_caps caps;
 463
 464         if (!stream->ops->get_caps)
 465                 return -ENXIO;
 466
 467         memset(&caps, 0, sizeof(caps));
 468         retval = stream->ops->get_caps(stream, &caps);
 469         if (retval)
 470                 goto out;
 471         if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
 472                 retval = -EFAULT;
 473 out:
 474         return retval;
 475 }
 476
 477 #ifndef COMPR_CODEC_CAPS_OVERFLOW
 478 static int
 479 snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
 480 {
 481         int retval;
 482         struct snd_compr_codec_caps *caps;
 483
 484         if (!stream->ops->get_codec_caps)
 485                 return -ENXIO;
 486
 487         caps = kzalloc(sizeof(*caps), GFP_KERNEL);
 488         if (!caps)
 489                 return -ENOMEM;
 490
 491         retval = stream->ops->get_codec_caps(stream, caps);
 492         if (retval)
 493                 goto out;
 494         if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
 495                 retval = -EFAULT;
 496
 497 out:
 498         kfree(caps);
 499         return retval;
 500 }
 501 #endif /* !COMPR_CODEC_CAPS_OVERFLOW */
 502
 503 /* revisit this with snd_pcm_preallocate_xxx */
 504 static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
 505                 struct snd_compr_params *params)
 506 {
 507         unsigned int buffer_size;
 508         void *buffer;
 509
 510         buffer_size = params->buffer.fragment_size * params->buffer.fragments;
 511         if (stream->ops->copy) {
 512                 buffer = NULL;
 513                 /* if copy is defined the driver will be required to copy
 514                  * the data from core
 515                  */
 516         } else {
 517                 buffer = kmalloc(buffer_size, GFP_KERNEL);
 518                 if (!buffer)
 519                         return -ENOMEM;
 520         }
 521         stream->runtime->fragment_size = params->buffer.fragment_size;
 522         stream->runtime->fragments = params->buffer.fragments;
 523         stream->runtime->buffer = buffer;
 524         stream->runtime->buffer_size = buffer_size;
 525         return 0;
 526 }
 527
 528 static int snd_compress_check_input(struct snd_compr_params *params)
 529 {
 530         /* first let's check the buffer parameter's */
 531         if (params->buffer.fragment_size == 0 ||
 532             params->buffer.fragments > INT_MAX / params->buffer.fragment_size)
 533                 return -EINVAL;
 534
 535         /* now codec parameters */
 536         if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
 537                 return -EINVAL;
 538
 539         if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
 540                 return -EINVAL;
 541
 542         return 0;
 543 }
 544
 545 static int
 546 snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
 547 {
 548         struct snd_compr_params *params;
 549         int retval;
 550
 551         if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
 552                 /*
 553                  * we should allow parameter change only when stream has been
 554                  * opened not in other cases
 555                  */
 556                 params = kmalloc(sizeof(*params), GFP_KERNEL);
 557                 if (!params)
 558                         return -ENOMEM;
 559                 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
 560                         retval = -EFAULT;
 561                         goto out;
 562                 }
 563
 564                 retval = snd_compress_check_input(params);
 565                 if (retval)
 566                         goto out;
 567
 568                 retval = snd_compr_allocate_buffer(stream, params);
 569                 if (retval) {
 570                         retval = -ENOMEM;
 571                         goto out;
 572                 }
 573
 574                 retval = stream->ops->set_params(stream, params);
 575                 if (retval)
 576                         goto out;
 577
 578                 stream->metadata_set = false;
 579                 stream->next_track = false;
 580
 581                 if (stream->direction == SND_COMPRESS_PLAYBACK)
 582                         stream->runtime->state = SNDRV_PCM_STATE_SETUP;
 583                 else
 584                         stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
 585         } else {
 586                 return -EPERM;
 587         }
 588 out:
 589         kfree(params);
 590         return retval;
 591 }
 592
 593 static int
 594 snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
 595 {
 596         struct snd_codec *params;
 597         int retval;
 598
 599         if (!stream->ops->get_params)
 600                 return -EBADFD;
 601
 602         params = kzalloc(sizeof(*params), GFP_KERNEL);
 603         if (!params)
 604                 return -ENOMEM;
 605         retval = stream->ops->get_params(stream, params);
 606         if (retval)
 607                 goto out;
 608         if (copy_to_user((char __user *)arg, params, sizeof(*params)))
 609                 retval = -EFAULT;
 610
 611 out:
 612         kfree(params);
 613         return retval;
 614 }
 615
 616 static int
 617 snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
 618 {
 619         struct snd_compr_metadata metadata;
 620         int retval;
 621
 622         if (!stream->ops->get_metadata)
 623                 return -ENXIO;
 624
 625         if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
 626                 return -EFAULT;
 627
 628         retval = stream->ops->get_metadata(stream, &metadata);
 629         if (retval != 0)
 630                 return retval;
 631
 632         if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
 633                 return -EFAULT;
 634
 635         return 0;
 636 }
 637
 638 static int
 639 snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
 640 {
 641         struct snd_compr_metadata metadata;
 642         int retval;
 643
 644         if (!stream->ops->set_metadata)
 645                 return -ENXIO;
 646         /*
 647         * we should allow parameter change only when stream has been
 648         * opened not in other cases
 649         */
 650         if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
 651                 return -EFAULT;
 652
 653         retval = stream->ops->set_metadata(stream, &metadata);
 654         stream->metadata_set = true;
 655
 656         return retval;
 657 }
 658
 659 static inline int
 660 snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
 661 {
 662         struct snd_compr_tstamp tstamp = {0};
 663         int ret;
 664
 665         ret = snd_compr_update_tstamp(stream, &tstamp);
 666         if (ret == 0)
 667                 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
 668                         &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
 669         return ret;
 670 }
 671
 672 static int snd_compr_pause(struct snd_compr_stream *stream)
 673 {
 674         int retval;
 675
 676         if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
 677                 return -EPERM;
 678         retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
 679         if (!retval)
 680                 stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
 681         return retval;
 682 }
 683
 684 static int snd_compr_resume(struct snd_compr_stream *stream)
 685 {
 686         int retval;
 687
 688         if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
 689                 return -EPERM;
 690         retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 691         if (!retval)
 692                 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
 693         return retval;
 694 }
 695
 696 static int snd_compr_start(struct snd_compr_stream *stream)
 697 {
 698         int retval;
 699
 700         if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
 701                 return -EPERM;
 702         retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
 703         if (!retval)
 704                 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
 705         return retval;
 706 }
 707
 708 static int snd_compr_stop(struct snd_compr_stream *stream)
 709 {
 710         int retval;
 711
 712         if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
 713                         stream->runtime->state == SNDRV_PCM_STATE_SETUP)
 714                 return -EPERM;
 715         retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
 716         if (!retval) {
 717                 snd_compr_drain_notify(stream);
 718                 stream->runtime->total_bytes_available = 0;
 719                 stream->runtime->total_bytes_transferred = 0;
 720         }
 721         return retval;
 722 }
 723
 724 static void error_delayed_work(struct work_struct *work)
 725 {
 726         struct snd_compr_stream *stream;
 727
 728         stream = container_of(work, struct snd_compr_stream, error_work.work);
 729
 730         mutex_lock(&stream->device->lock);
 731
 732         stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
 733         wake_up(&stream->runtime->sleep);
 734
 735         mutex_unlock(&stream->device->lock);
 736 }
 737
 738 /*
 739  * snd_compr_stop_error: Report a fatal error on a stream
 740  * @stream: pointer to stream
 741  * @state: state to transition the stream to
 742  *
 743  * Stop the stream and set its state.
 744  *
 745  * Should be called with compressed device lock held.
 746  */
 747 int snd_compr_stop_error(struct snd_compr_stream *stream,
 748                          snd_pcm_state_t state)
 749 {
 750         if (stream->runtime->state == state)
 751                 return 0;
 752
 753         stream->runtime->state = state;
 754
 755         pr_debug("Changing state to: %d\n", state);
 756
 757         queue_delayed_work(system_power_efficient_wq, &stream->error_work, 0);
 758
 759         return 0;
 760 }
 761 EXPORT_SYMBOL_GPL(snd_compr_stop_error);
 762
 763 static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
 764 {
 765         int ret;
 766
 767         /*
 768          * We are called with lock held. So drop the lock while we wait for
 769          * drain complete notification from the driver
 770          *
 771          * It is expected that driver will notify the drain completion and then
 772          * stream will be moved to SETUP state, even if draining resulted in an
 773          * error. We can trigger next track after this.
 774          */
 775         stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
 776         mutex_unlock(&stream->device->lock);
 777
 778         /* we wait for drain to complete here, drain can return when
 779          * interruption occurred, wait returned error or success.
 780          * For the first two cases we don't do anything different here and
 781          * return after waking up
 782          */
 783
 784         ret = wait_event_interruptible(stream->runtime->sleep,
 785                         (stream->runtime->state != SNDRV_PCM_STATE_DRAINING));
 786         if (ret == -ERESTARTSYS)
 787                 pr_debug("wait aborted by a signal");
 788         else if (ret)
 789                 pr_debug("wait for drain failed with %d\n", ret);
 790
 791
 792         wake_up(&stream->runtime->sleep);
 793         mutex_lock(&stream->device->lock);
 794
 795         return ret;
 796 }
 797
 798 static int snd_compr_drain(struct snd_compr_stream *stream)
 799 {
 800         int retval;
 801
 802         if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
 803                         stream->runtime->state == SNDRV_PCM_STATE_SETUP)
 804                 return -EPERM;
 805
 806         retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
 807         if (retval) {
 808                 pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
 809                 wake_up(&stream->runtime->sleep);
 810                 return retval;
 811         }
 812
 813         return snd_compress_wait_for_drain(stream);
 814 }
 815
 816 static int snd_compr_next_track(struct snd_compr_stream *stream)
 817 {
 818         int retval;
 819
 820         /* only a running stream can transition to next track */
 821         if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
 822                 return -EPERM;
 823
 824         /* you can signal next track if this is intended to be a gapless stream
 825          * and current track metadata is set
 826          */
 827         if (stream->metadata_set == false)
 828                 return -EPERM;
 829
 830         retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
 831         if (retval != 0)
 832                 return retval;
 833         stream->metadata_set = false;
 834         stream->next_track = true;
 835         return 0;
 836 }
 837
 838 static int snd_compr_partial_drain(struct snd_compr_stream *stream)
 839 {
 840         int retval;
 841         if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
 842                         stream->runtime->state == SNDRV_PCM_STATE_SETUP)
 843                 return -EPERM;
 844         /* stream can be drained only when next track has been signalled */
 845         if (stream->next_track == false)
 846                 return -EPERM;
 847
 848         retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
 849         if (retval) {
 850                 pr_debug("Partial drain returned failure\n");
 851                 wake_up(&stream->runtime->sleep);
 852                 return retval;
 853         }
 854
 855         stream->next_track = false;
 856         return snd_compress_wait_for_drain(stream);
 857 }
 858
 859 static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 860 {
 861         struct snd_compr_file *data = f->private_data;
 862         struct snd_compr_stream *stream;
 863         int retval = -ENOTTY;
 864
 865         if (snd_BUG_ON(!data))
 866                 return -EFAULT;
 867
 868         stream = &data->stream;
 869
 870         mutex_lock(&stream->device->lock);
 871         switch (_IOC_NR(cmd)) {
 872         case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
 873                 retval = put_user(SNDRV_COMPRESS_VERSION,
 874                                 (int __user *)arg) ? -EFAULT : 0;
 875                 break;
 876         case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
 877                 retval = snd_compr_get_caps(stream, arg);
 878                 break;
 879 #ifndef COMPR_CODEC_CAPS_OVERFLOW
 880         case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
 881                 retval = snd_compr_get_codec_caps(stream, arg);
 882                 break;
 883 #endif
 884         case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
 885                 retval = snd_compr_set_params(stream, arg);
 886                 break;
 887         case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
 888                 retval = snd_compr_get_params(stream, arg);
 889                 break;
 890         case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
 891                 retval = snd_compr_set_metadata(stream, arg);
 892                 break;
 893         case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
 894                 retval = snd_compr_get_metadata(stream, arg);
 895                 break;
 896         case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
 897                 retval = snd_compr_tstamp(stream, arg);
 898                 break;
 899         case _IOC_NR(SNDRV_COMPRESS_AVAIL):
 900                 retval = snd_compr_ioctl_avail(stream, arg);
 901                 break;
 902         case _IOC_NR(SNDRV_COMPRESS_PAUSE):
 903                 retval = snd_compr_pause(stream);
 904                 break;
 905         case _IOC_NR(SNDRV_COMPRESS_RESUME):
 906                 retval = snd_compr_resume(stream);
 907                 break;
 908         case _IOC_NR(SNDRV_COMPRESS_START):
 909                 retval = snd_compr_start(stream);
 910                 break;
 911         case _IOC_NR(SNDRV_COMPRESS_STOP):
 912                 retval = snd_compr_stop(stream);
 913                 break;
 914         case _IOC_NR(SNDRV_COMPRESS_DRAIN):
 915                 retval = snd_compr_drain(stream);
 916                 break;
 917         case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
 918                 retval = snd_compr_partial_drain(stream);
 919                 break;
 920         case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
 921                 retval = snd_compr_next_track(stream);
 922                 break;
 923
 924         }
 925         mutex_unlock(&stream->device->lock);
 926         return retval;
 927 }
 928
 929 /* support of 32bit userspace on 64bit platforms */
 930 #ifdef CONFIG_COMPAT
 931 static long snd_compr_ioctl_compat(struct file *file, unsigned int cmd,
 932                                                 unsigned long arg)
 933 {
 934         return snd_compr_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
 935 }
 936 #endif
 937
 938 static const struct file_operations snd_compr_file_ops = {
 939                 .owner =        THIS_MODULE,
 940                 .open =         snd_compr_open,
 941                 .release =      snd_compr_free,
 942                 .write =        snd_compr_write,
 943                 .read =         snd_compr_read,
 944                 .unlocked_ioctl = snd_compr_ioctl,
 945 #ifdef CONFIG_COMPAT
 946                 .compat_ioctl = snd_compr_ioctl_compat,
 947 #endif
 948                 .mmap =         snd_compr_mmap,
 949                 .poll =         snd_compr_poll,
 950 };
 951
 952 static int snd_compress_dev_register(struct snd_device *device)
 953 {
 954         int ret = -EINVAL;
 955         char str[16];
 956         struct snd_compr *compr;
 957
 958         if (snd_BUG_ON(!device || !device->device_data))
 959                 return -EBADFD;
 960         compr = device->device_data;
 961
 962         pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
 963                         compr->direction);
 964         /* register compressed device */
 965         ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS,
 966                                   compr->card, compr->device,
 967                                   &snd_compr_file_ops, compr, &compr->dev);
 968         if (ret < 0) {
 969                 pr_err("snd_register_device failed\n %d", ret);
 970                 return ret;
 971         }
 972         return ret;
 973
 974 }
 975
 976 static int snd_compress_dev_disconnect(struct snd_device *device)
 977 {
 978         struct snd_compr *compr;
 979
 980         compr = device->device_data;
 981         snd_unregister_device(&compr->dev);
 982         return 0;
 983 }
 984
 985 #ifdef CONFIG_SND_VERBOSE_PROCFS
 986 static void snd_compress_proc_info_read(struct snd_info_entry *entry,
 987                                         struct snd_info_buffer *buffer)
 988 {
 989         struct snd_compr *compr = (struct snd_compr *)entry->private_data;
 990
 991         snd_iprintf(buffer, "card: %d\n", compr->card->number);
 992         snd_iprintf(buffer, "device: %d\n", compr->device);
 993         snd_iprintf(buffer, "stream: %s\n",
 994                         compr->direction == SND_COMPRESS_PLAYBACK
 995                                 ? "PLAYBACK" : "CAPTURE");
 996         snd_iprintf(buffer, "id: %s\n", compr->id);
 997 }
 998
 999 static int snd_compress_proc_init(struct snd_compr *compr)
1000 {
1001         struct snd_info_entry *entry;
1002         char name[16];
1003
1004         sprintf(name, "compr%i", compr->device);
1005         entry = snd_info_create_card_entry(compr->card, name,
1006                                            compr->card->proc_root);
1007         if (!entry)
1008                 return -ENOMEM;
1009         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
1010         if (snd_info_register(entry) < 0) {
1011                 snd_info_free_entry(entry);
1012                 return -ENOMEM;
1013         }
1014         compr->proc_root = entry;
1015
1016         entry = snd_info_create_card_entry(compr->card, "info",
1017                                            compr->proc_root);
1018         if (entry) {
1019                 snd_info_set_text_ops(entry, compr,
1020                                       snd_compress_proc_info_read);
1021                 if (snd_info_register(entry) < 0) {
1022                         snd_info_free_entry(entry);
1023                         entry = NULL;
1024                 }
1025         }
1026         compr->proc_info_entry = entry;
1027
1028         return 0;
1029 }
1030
1031 static void snd_compress_proc_done(struct snd_compr *compr)
1032 {
1033         snd_info_free_entry(compr->proc_info_entry);
1034         compr->proc_info_entry = NULL;
1035         snd_info_free_entry(compr->proc_root);
1036         compr->proc_root = NULL;
1037 }
1038
1039 static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
1040 {
1041         strlcpy(compr->id, id, sizeof(compr->id));
1042 }
1043 #else
1044 static inline int snd_compress_proc_init(struct snd_compr *compr)
1045 {
1046         return 0;
1047 }
1048
1049 static inline void snd_compress_proc_done(struct snd_compr *compr)
1050 {
1051 }
1052
1053 static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
1054 {
1055 }
1056 #endif
1057
1058 static int snd_compress_dev_free(struct snd_device *device)
1059 {
1060         struct snd_compr *compr;
1061
1062         compr = device->device_data;
1063         snd_compress_proc_done(compr);
1064         put_device(&compr->dev);
1065         return 0;
1066 }
1067
1068 /*
1069  * snd_compress_new: create new compress device
1070  * @card: sound card pointer
1071  * @device: device number
1072  * @dirn: device direction, should be of type enum snd_compr_direction
1073  * @compr: compress device pointer
1074  */
1075 int snd_compress_new(struct snd_card *card, int device,
1076                         int dirn, const char *id, struct snd_compr *compr)
1077 {
1078         static struct snd_device_ops ops = {
1079                 .dev_free = snd_compress_dev_free,
1080                 .dev_register = snd_compress_dev_register,
1081                 .dev_disconnect = snd_compress_dev_disconnect,
1082         };
1083         int ret;
1084
1085         compr->card = card;
1086         compr->device = device;
1087         compr->direction = dirn;
1088
1089         snd_compress_set_id(compr, id);
1090
1091         snd_device_initialize(&compr->dev, card);
1092         dev_set_name(&compr->dev, "comprC%iD%i", card->number, device);
1093
1094         ret = snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
1095         if (ret == 0)
1096                 snd_compress_proc_init(compr);
1097
1098         return ret;
1099 }
1100 EXPORT_SYMBOL_GPL(snd_compress_new);
1101
1102 static int snd_compress_add_device(struct snd_compr *device)
1103 {
1104         int ret;
1105
1106         if (!device->card)
1107                 return -EINVAL;
1108
1109         /* register the card */
1110         ret = snd_card_register(device->card);
1111         if (ret)
1112                 goto out;
1113         return 0;
1114
1115 out:
1116         pr_err("failed with %d\n", ret);
1117         return ret;
1118
1119 }
1120
1121 static int snd_compress_remove_device(struct snd_compr *device)
1122 {
1123         return snd_card_free(device->card);
1124 }
1125
1126 /**
1127  * snd_compress_register - register compressed device
1128  *
1129  * @device: compressed device to register
1130  */
1131 int snd_compress_register(struct snd_compr *device)
1132 {
1133         int retval;
1134
1135         if (device->name == NULL || device->ops == NULL)
1136                 return -EINVAL;
1137
1138         pr_debug("Registering compressed device %s\n", device->name);
1139         if (snd_BUG_ON(!device->ops->open))
1140                 return -EINVAL;
1141         if (snd_BUG_ON(!device->ops->free))
1142                 return -EINVAL;
1143         if (snd_BUG_ON(!device->ops->set_params))
1144                 return -EINVAL;
1145         if (snd_BUG_ON(!device->ops->trigger))
1146                 return -EINVAL;
1147
1148         mutex_init(&device->lock);
1149
1150         /* register a compressed card */
1151         mutex_lock(&device_mutex);
1152         retval = snd_compress_add_device(device);
1153         mutex_unlock(&device_mutex);
1154         return retval;
1155 }
1156 EXPORT_SYMBOL_GPL(snd_compress_register);
1157
1158 int snd_compress_deregister(struct snd_compr *device)
1159 {
1160         pr_debug("Removing compressed device %s\n", device->name);
1161         mutex_lock(&device_mutex);
1162         snd_compress_remove_device(device);
1163         mutex_unlock(&device_mutex);
1164         return 0;
1165 }
1166 EXPORT_SYMBOL_GPL(snd_compress_deregister);
1167
1168 static int __init snd_compress_init(void)
1169 {
1170         return 0;
1171 }
1172
1173 static void __exit snd_compress_exit(void)
1174 {
1175 }
1176
1177 module_init(snd_compress_init);
1178 module_exit(snd_compress_exit);
1179
1180 MODULE_DESCRIPTION("ALSA Compressed offload framework");
1181 MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
1182 MODULE_LICENSE("GPL v2");