sound/core/compress_offload.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  compress_core.c - compress offload core
   4  *
   5  *  Copyright (C) 2011 Intel Corporation
   6  *  Authors:    Vinod Koul <[email protected]>
   7  *              Pierre-Louis Bossart <[email protected]>
   8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  */
  12 #define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt)
  14
  15 #include <linux/file.h>
  16 #include <linux/fs.h>
  17 #include <linux/list.h>
  18 #include <linux/math64.h>
  19 #include <linux/mm.h>
  20 #include <linux/mutex.h>
  21 #include <linux/poll.h>
  22 #include <linux/slab.h>
  23 #include <linux/sched.h>
  24 #include <linux/types.h>
  25 #include <linux/uio.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/module.h>
  28 #include <linux/compat.h>
  29 #include <sound/core.h>
  30 #include <sound/initval.h>
  31 #include <sound/info.h>
  32 #include <sound/compress_params.h>
  33 #include <sound/compress_offload.h>
  34 #include <sound/compress_driver.h>
  35
  36 /* struct snd_compr_codec_caps overflows the ioctl bit size for some
  37  * architectures, so we need to disable the relevant ioctls.
  38  */
  39 #if _IOC_SIZEBITS < 14
  40 #define COMPR_CODEC_CAPS_OVERFLOW
  41 #endif
  42
  43 /* TODO:
  44  * - add substream support for multiple devices in case of
  45  *      SND_DYNAMIC_MINORS is not used
  46  * - Multiple node representation
  47  *      driver should be able to register multiple nodes
  48  */
  49
  50 struct snd_compr_file {
  51         unsigned long caps;
  52         struct snd_compr_stream stream;
  53 };
  54
  55 static void error_delayed_work(struct work_struct *work);
  56
  57 /*
  58  * a note on stream states used:
  59  * we use following states in the compressed core
  60  * SNDRV_PCM_STATE_OPEN: When stream has been opened.
  61  * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
  62  *      calling SNDRV_COMPRESS_SET_PARAMS. Running streams will come to this
  63  *      state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
  64  * SNDRV_PCM_STATE_PREPARED: When a stream has been written to (for
  65  *      playback only). User after setting up stream writes the data buffer
  66  *      before starting the stream.
  67  * SNDRV_PCM_STATE_RUNNING: When stream has been started and is
  68  *      decoding/encoding and rendering/capturing data.
  69  * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
  70  *      by calling SNDRV_COMPRESS_DRAIN.
  71  * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
  72  *      SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
  73  *      SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
  74  */
  75 static int snd_compr_open(struct inode *inode, struct file *f)
  76 {
  77         struct snd_compr *compr;
  78         struct snd_compr_file *data;
  79         struct snd_compr_runtime *runtime;
  80         enum snd_compr_direction dirn;
  81         int maj = imajor(inode);
  82         int ret;
  83
  84         if ((f->f_flags & O_ACCMODE) == O_WRONLY)
  85                 dirn = SND_COMPRESS_PLAYBACK;
  86         else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
  87                 dirn = SND_COMPRESS_CAPTURE;
  88         else
  89                 return -EINVAL;
  90
  91         if (maj == snd_major)
  92                 compr = snd_lookup_minor_data(iminor(inode),
  93                                         SNDRV_DEVICE_TYPE_COMPRESS);
  94         else
  95                 return -EBADFD;
  96
  97         if (compr == NULL) {
  98                 pr_err("no device data!!!\n");
  99                 return -ENODEV;
 100         }
 101
 102         if (dirn != compr->direction) {
 103                 pr_err("this device doesn't support this direction\n");
 104                 snd_card_unref(compr->card);
 105                 return -EINVAL;
 106         }
 107
 108         data = kzalloc(sizeof(*data), GFP_KERNEL);
 109         if (!data) {
 110                 snd_card_unref(compr->card);
 111                 return -ENOMEM;
 112         }
 113
 114         INIT_DELAYED_WORK(&data->stream.error_work, error_delayed_work);
 115
 116         data->stream.ops = compr->ops;
 117         data->stream.direction = dirn;
 118         data->stream.private_data = compr->private_data;
 119         data->stream.device = compr;
 120         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 121         if (!runtime) {
 122                 kfree(data);
 123                 snd_card_unref(compr->card);
 124                 return -ENOMEM;
 125         }
 126         runtime->state = SNDRV_PCM_STATE_OPEN;
 127         init_waitqueue_head(&runtime->sleep);
 128         data->stream.runtime = runtime;
 129         f->private_data = (void *)data;
 130         mutex_lock(&compr->lock);
 131         ret = compr->ops->open(&data->stream);
 132         mutex_unlock(&compr->lock);
 133         if (ret) {
 134                 kfree(runtime);
 135                 kfree(data);
 136         }
 137         snd_card_unref(compr->card);
 138         return ret;
 139 }
 140
 141 static int snd_compr_free(struct inode *inode, struct file *f)
 142 {
 143         struct snd_compr_file *data = f->private_data;
 144         struct snd_compr_runtime *runtime = data->stream.runtime;
 145
 146         cancel_delayed_work_sync(&data->stream.error_work);
 147
 148         switch (runtime->state) {
 149         case SNDRV_PCM_STATE_RUNNING:
 150         case SNDRV_PCM_STATE_DRAINING:
 151         case SNDRV_PCM_STATE_PAUSED:
 152                 data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP);
 153                 break;
 154         default:
 155                 break;
 156         }
 157
 158         data->stream.ops->free(&data->stream);
 159         if (!data->stream.runtime->dma_buffer_p)
 160                 kfree(data->stream.runtime->buffer);
 161         kfree(data->stream.runtime);
 162         kfree(data);
 163         return 0;
 164 }
 165
 166 static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
 167                 struct snd_compr_tstamp *tstamp)
 168 {
 169         if (!stream->ops->pointer)
 170                 return -ENOTSUPP;
 171         stream->ops->pointer(stream, tstamp);
 172         pr_debug("dsp consumed till %d total %d bytes\n",
 173                 tstamp->byte_offset, tstamp->copied_total);
 174         if (stream->direction == SND_COMPRESS_PLAYBACK)
 175                 stream->runtime->total_bytes_transferred = tstamp->copied_total;
 176         else
 177                 stream->runtime->total_bytes_available = tstamp->copied_total;
 178         return 0;
 179 }
 180
 181 static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
 182                 struct snd_compr_avail *avail)
 183 {
 184         memset(avail, 0, sizeof(*avail));
 185         snd_compr_update_tstamp(stream, &avail->tstamp);
 186         /* Still need to return avail even if tstamp can't be filled in */
 187
 188         if (stream->runtime->total_bytes_available == 0 &&
 189                         stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
 190                         stream->direction == SND_COMPRESS_PLAYBACK) {
 191                 pr_debug("detected init and someone forgot to do a write\n");
 192                 return stream->runtime->buffer_size;
 193         }
 194         pr_debug("app wrote %lld, DSP consumed %lld\n",
 195                         stream->runtime->total_bytes_available,
 196                         stream->runtime->total_bytes_transferred);
 197         if (stream->runtime->total_bytes_available ==
 198                                 stream->runtime->total_bytes_transferred) {
 199                 if (stream->direction == SND_COMPRESS_PLAYBACK) {
 200                         pr_debug("both pointers are same, returning full avail\n");
 201                         return stream->runtime->buffer_size;
 202                 } else {
 203                         pr_debug("both pointers are same, returning no avail\n");
 204                         return 0;
 205                 }
 206         }
 207
 208         avail->avail = stream->runtime->total_bytes_available -
 209                         stream->runtime->total_bytes_transferred;
 210         if (stream->direction == SND_COMPRESS_PLAYBACK)
 211                 avail->avail = stream->runtime->buffer_size - avail->avail;
 212
 213         pr_debug("ret avail as %lld\n", avail->avail);
 214         return avail->avail;
 215 }
 216
 217 static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
 218 {
 219         struct snd_compr_avail avail;
 220
 221         return snd_compr_calc_avail(stream, &avail);
 222 }
 223
 224 static int
 225 snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
 226 {
 227         struct snd_compr_avail ioctl_avail;
 228         size_t avail;
 229
 230         avail = snd_compr_calc_avail(stream, &ioctl_avail);
 231         ioctl_avail.avail = avail;
 232
 233         switch (stream->runtime->state) {
 234         case SNDRV_PCM_STATE_OPEN:
 235                 return -EBADFD;
 236         case SNDRV_PCM_STATE_XRUN:
 237                 return -EPIPE;
 238         default:
 239                 break;
 240         }
 241
 242         if (copy_to_user((__u64 __user *)arg,
 243                                 &ioctl_avail, sizeof(ioctl_avail)))
 244                 return -EFAULT;
 245         return 0;
 246 }
 247
 248 static int snd_compr_write_data(struct snd_compr_stream *stream,
 249                const char __user *buf, size_t count)
 250 {
 251         void *dstn;
 252         size_t copy;
 253         struct snd_compr_runtime *runtime = stream->runtime;
 254         /* 64-bit Modulus */
 255         u64 app_pointer = div64_u64(runtime->total_bytes_available,
 256                                     runtime->buffer_size);
 257         app_pointer = runtime->total_bytes_available -
 258                       (app_pointer * runtime->buffer_size);
 259
 260         dstn = runtime->buffer + app_pointer;
 261         pr_debug("copying %ld at %lld\n",
 262                         (unsigned long)count, app_pointer);
 263         if (count < runtime->buffer_size - app_pointer) {
 264                 if (copy_from_user(dstn, buf, count))
 265                         return -EFAULT;
 266         } else {
 267                 copy = runtime->buffer_size - app_pointer;
 268                 if (copy_from_user(dstn, buf, copy))
 269                         return -EFAULT;
 270                 if (copy_from_user(runtime->buffer, buf + copy, count - copy))
 271                         return -EFAULT;
 272         }
 273         /* if DSP cares, let it know data has been written */
 274         if (stream->ops->ack)
 275                 stream->ops->ack(stream, count);
 276         return count;
 277 }
 278
 279 static ssize_t snd_compr_write(struct file *f, const char __user *buf,
 280                 size_t count, loff_t *offset)
 281 {
 282         struct snd_compr_file *data = f->private_data;
 283         struct snd_compr_stream *stream;
 284         size_t avail;
 285         int retval;
 286
 287         if (snd_BUG_ON(!data))
 288                 return -EFAULT;
 289
 290         stream = &data->stream;
 291         mutex_lock(&stream->device->lock);
 292         /* write is allowed when stream is running or has been steup */
 293         switch (stream->runtime->state) {
 294         case SNDRV_PCM_STATE_SETUP:
 295         case SNDRV_PCM_STATE_PREPARED:
 296         case SNDRV_PCM_STATE_RUNNING:
 297                 break;
 298         default:
 299                 mutex_unlock(&stream->device->lock);
 300                 return -EBADFD;
 301         }
 302
 303         avail = snd_compr_get_avail(stream);
 304         pr_debug("avail returned %ld\n", (unsigned long)avail);
 305         /* calculate how much we can write to buffer */
 306         if (avail > count)
 307                 avail = count;
 308
 309         if (stream->ops->copy) {
 310                 char __user* cbuf = (char __user*)buf;
 311                 retval = stream->ops->copy(stream, cbuf, avail);
 312         } else {
 313                 retval = snd_compr_write_data(stream, buf, avail);
 314         }
 315         if (retval > 0)
 316                 stream->runtime->total_bytes_available += retval;
 317
 318         /* while initiating the stream, write should be called before START
 319          * call, so in setup move state */
 320         if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
 321                 stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
 322                 pr_debug("stream prepared, Houston we are good to go\n");
 323         }
 324
 325         mutex_unlock(&stream->device->lock);
 326         return retval;
 327 }
 328
 329
 330 static ssize_t snd_compr_read(struct file *f, char __user *buf,
 331                 size_t count, loff_t *offset)
 332 {
 333         struct snd_compr_file *data = f->private_data;
 334         struct snd_compr_stream *stream;
 335         size_t avail;
 336         int retval;
 337
 338         if (snd_BUG_ON(!data))
 339                 return -EFAULT;
 340
 341         stream = &data->stream;
 342         mutex_lock(&stream->device->lock);
 343
 344         /* read is allowed when stream is running, paused, draining and setup
 345          * (yes setup is state which we transition to after stop, so if user
 346          * wants to read data after stop we allow that)
 347          */
 348         switch (stream->runtime->state) {
 349         case SNDRV_PCM_STATE_OPEN:
 350         case SNDRV_PCM_STATE_PREPARED:
 351         case SNDRV_PCM_STATE_SUSPENDED:
 352         case SNDRV_PCM_STATE_DISCONNECTED:
 353                 retval = -EBADFD;
 354                 goto out;
 355         case SNDRV_PCM_STATE_XRUN:
 356                 retval = -EPIPE;
 357                 goto out;
 358         }
 359
 360         avail = snd_compr_get_avail(stream);
 361         pr_debug("avail returned %ld\n", (unsigned long)avail);
 362         /* calculate how much we can read from buffer */
 363         if (avail > count)
 364                 avail = count;
 365
 366         if (stream->ops->copy) {
 367                 retval = stream->ops->copy(stream, buf, avail);
 368         } else {
 369                 retval = -ENXIO;
 370                 goto out;
 371         }
 372         if (retval > 0)
 373                 stream->runtime->total_bytes_transferred += retval;
 374
 375 out:
 376         mutex_unlock(&stream->device->lock);
 377         return retval;
 378 }
 379
 380 static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
 381 {
 382         return -ENXIO;
 383 }
 384
 385 static __poll_t snd_compr_get_poll(struct snd_compr_stream *stream)
 386 {
 387         if (stream->direction == SND_COMPRESS_PLAYBACK)
 388                 return EPOLLOUT | EPOLLWRNORM;
 389         else
 390                 return EPOLLIN | EPOLLRDNORM;
 391 }
 392
 393 static __poll_t snd_compr_poll(struct file *f, poll_table *wait)
 394 {
 395         struct snd_compr_file *data = f->private_data;
 396         struct snd_compr_stream *stream;
 397         size_t avail;
 398         __poll_t retval = 0;
 399
 400         if (snd_BUG_ON(!data))
 401                 return EPOLLERR;
 402
 403         stream = &data->stream;
 404
 405         mutex_lock(&stream->device->lock);
 406
 407         switch (stream->runtime->state) {
 408         case SNDRV_PCM_STATE_OPEN:
 409         case SNDRV_PCM_STATE_XRUN:
 410                 retval = snd_compr_get_poll(stream) | EPOLLERR;
 411                 goto out;
 412         default:
 413                 break;
 414         }
 415
 416         poll_wait(f, &stream->runtime->sleep, wait);
 417
 418         avail = snd_compr_get_avail(stream);
 419         pr_debug("avail is %ld\n", (unsigned long)avail);
 420         /* check if we have at least one fragment to fill */
 421         switch (stream->runtime->state) {
 422         case SNDRV_PCM_STATE_DRAINING:
 423                 /* stream has been woken up after drain is complete
 424                  * draining done so set stream state to stopped
 425                  */
 426                 retval = snd_compr_get_poll(stream);
 427                 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
 428                 break;
 429         case SNDRV_PCM_STATE_RUNNING:
 430         case SNDRV_PCM_STATE_PREPARED:
 431         case SNDRV_PCM_STATE_PAUSED:
 432                 if (avail >= stream->runtime->fragment_size)
 433                         retval = snd_compr_get_poll(stream);
 434                 break;
 435         default:
 436                 retval = snd_compr_get_poll(stream) | EPOLLERR;
 437                 break;
 438         }
 439 out:
 440         mutex_unlock(&stream->device->lock);
 441         return retval;
 442 }
 443
 444 static int
 445 snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
 446 {
 447         int retval;
 448         struct snd_compr_caps caps;
 449
 450         if (!stream->ops->get_caps)
 451                 return -ENXIO;
 452
 453         memset(&caps, 0, sizeof(caps));
 454         retval = stream->ops->get_caps(stream, &caps);
 455         if (retval)
 456                 goto out;
 457         if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
 458                 retval = -EFAULT;
 459 out:
 460         return retval;
 461 }
 462
 463 #ifndef COMPR_CODEC_CAPS_OVERFLOW
 464 static int
 465 snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
 466 {
 467         int retval;
 468         struct snd_compr_codec_caps *caps;
 469
 470         if (!stream->ops->get_codec_caps)
 471                 return -ENXIO;
 472
 473         caps = kzalloc(sizeof(*caps), GFP_KERNEL);
 474         if (!caps)
 475                 return -ENOMEM;
 476
 477         retval = stream->ops->get_codec_caps(stream, caps);
 478         if (retval)
 479                 goto out;
 480         if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
 481                 retval = -EFAULT;
 482
 483 out:
 484         kfree(caps);
 485         return retval;
 486 }
 487 #endif /* !COMPR_CODEC_CAPS_OVERFLOW */
 488
 489 int snd_compr_malloc_pages(struct snd_compr_stream *stream, size_t size)
 490 {
 491         struct snd_dma_buffer *dmab;
 492         int ret;
 493
 494         if (snd_BUG_ON(!(stream) || !(stream)->runtime))
 495                 return -EINVAL;
 496         dmab = kzalloc(sizeof(*dmab), GFP_KERNEL);
 497         if (!dmab)
 498                 return -ENOMEM;
 499         dmab->dev = stream->dma_buffer.dev;
 500         ret = snd_dma_alloc_pages(dmab->dev.type, dmab->dev.dev, size, dmab);
 501         if (ret < 0) {
 502                 kfree(dmab);
 503                 return ret;
 504         }
 505
 506         snd_compr_set_runtime_buffer(stream, dmab);
 507         stream->runtime->dma_bytes = size;
 508         return 1;
 509 }
 510 EXPORT_SYMBOL(snd_compr_malloc_pages);
 511
 512 int snd_compr_free_pages(struct snd_compr_stream *stream)
 513 {
 514         struct snd_compr_runtime *runtime;
 515
 516         if (snd_BUG_ON(!(stream) || !(stream)->runtime))
 517                 return -EINVAL;
 518         runtime = stream->runtime;
 519         if (runtime->dma_area == NULL)
 520                 return 0;
 521         if (runtime->dma_buffer_p != &stream->dma_buffer) {
 522                 /* It's a newly allocated buffer. Release it now. */
 523                 snd_dma_free_pages(runtime->dma_buffer_p);
 524                 kfree(runtime->dma_buffer_p);
 525         }
 526
 527         snd_compr_set_runtime_buffer(stream, NULL);
 528         return 0;
 529 }
 530 EXPORT_SYMBOL(snd_compr_free_pages);
 531
 532 /* revisit this with snd_pcm_preallocate_xxx */
 533 static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
 534                 struct snd_compr_params *params)
 535 {
 536         unsigned int buffer_size;
 537         void *buffer = NULL;
 538
 539         buffer_size = params->buffer.fragment_size * params->buffer.fragments;
 540         if (stream->ops->copy) {
 541                 buffer = NULL;
 542                 /* if copy is defined the driver will be required to copy
 543                  * the data from core
 544                  */
 545         } else {
 546                 if (stream->runtime->dma_buffer_p) {
 547
 548                         if (buffer_size > stream->runtime->dma_buffer_p->bytes)
 549                                 dev_err(&stream->device->dev,
 550                                                 "Not enough DMA buffer");
 551                         else
 552                                 buffer = stream->runtime->dma_buffer_p->area;
 553
 554                 } else {
 555                         buffer = kmalloc(buffer_size, GFP_KERNEL);
 556                 }
 557
 558                 if (!buffer)
 559                         return -ENOMEM;
 560         }
 561         stream->runtime->fragment_size = params->buffer.fragment_size;
 562         stream->runtime->fragments = params->buffer.fragments;
 563         stream->runtime->buffer = buffer;
 564         stream->runtime->buffer_size = buffer_size;
 565         return 0;
 566 }
 567
 568 static int snd_compress_check_input(struct snd_compr_params *params)
 569 {
 570         /* first let's check the buffer parameter's */
 571         if (params->buffer.fragment_size == 0 ||
 572             params->buffer.fragments > U32_MAX / params->buffer.fragment_size ||
 573             params->buffer.fragments == 0)
 574                 return -EINVAL;
 575
 576         /* now codec parameters */
 577         if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
 578                 return -EINVAL;
 579
 580         if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
 581                 return -EINVAL;
 582
 583         return 0;
 584 }
 585
 586 static int
 587 snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
 588 {
 589         struct snd_compr_params *params;
 590         int retval;
 591
 592         if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
 593                 /*
 594                  * we should allow parameter change only when stream has been
 595                  * opened not in other cases
 596                  */
 597                 params = memdup_user((void __user *)arg, sizeof(*params));
 598                 if (IS_ERR(params))
 599                         return PTR_ERR(params);
 600
 601                 retval = snd_compress_check_input(params);
 602                 if (retval)
 603                         goto out;
 604
 605                 retval = snd_compr_allocate_buffer(stream, params);
 606                 if (retval) {
 607                         retval = -ENOMEM;
 608                         goto out;
 609                 }
 610
 611                 retval = stream->ops->set_params(stream, params);
 612                 if (retval)
 613                         goto out;
 614
 615                 stream->metadata_set = false;
 616                 stream->next_track = false;
 617
 618                 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
 619         } else {
 620                 return -EPERM;
 621         }
 622 out:
 623         kfree(params);
 624         return retval;
 625 }
 626
 627 static int
 628 snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
 629 {
 630         struct snd_codec *params;
 631         int retval;
 632
 633         if (!stream->ops->get_params)
 634                 return -EBADFD;
 635
 636         params = kzalloc(sizeof(*params), GFP_KERNEL);
 637         if (!params)
 638                 return -ENOMEM;
 639         retval = stream->ops->get_params(stream, params);
 640         if (retval)
 641                 goto out;
 642         if (copy_to_user((char __user *)arg, params, sizeof(*params)))
 643                 retval = -EFAULT;
 644
 645 out:
 646         kfree(params);
 647         return retval;
 648 }
 649
 650 static int
 651 snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
 652 {
 653         struct snd_compr_metadata metadata;
 654         int retval;
 655
 656         if (!stream->ops->get_metadata)
 657                 return -ENXIO;
 658
 659         if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
 660                 return -EFAULT;
 661
 662         retval = stream->ops->get_metadata(stream, &metadata);
 663         if (retval != 0)
 664                 return retval;
 665
 666         if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
 667                 return -EFAULT;
 668
 669         return 0;
 670 }
 671
 672 static int
 673 snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
 674 {
 675         struct snd_compr_metadata metadata;
 676         int retval;
 677
 678         if (!stream->ops->set_metadata)
 679                 return -ENXIO;
 680         /*
 681         * we should allow parameter change only when stream has been
 682         * opened not in other cases
 683         */
 684         if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
 685                 return -EFAULT;
 686
 687         retval = stream->ops->set_metadata(stream, &metadata);
 688         stream->metadata_set = true;
 689
 690         return retval;
 691 }
 692
 693 static inline int
 694 snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
 695 {
 696         struct snd_compr_tstamp tstamp = {0};
 697         int ret;
 698
 699         ret = snd_compr_update_tstamp(stream, &tstamp);
 700         if (ret == 0)
 701                 ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
 702                         &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
 703         return ret;
 704 }
 705
 706 static int snd_compr_pause(struct snd_compr_stream *stream)
 707 {
 708         int retval;
 709
 710         switch (stream->runtime->state) {
 711         case SNDRV_PCM_STATE_RUNNING:
 712                 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
 713                 if (!retval)
 714                         stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
 715                 break;
 716         case SNDRV_PCM_STATE_DRAINING:
 717                 if (!stream->device->use_pause_in_draining)
 718                         return -EPERM;
 719                 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
 720                 if (!retval)
 721                         stream->pause_in_draining = true;
 722                 break;
 723         default:
 724                 return -EPERM;
 725         }
 726         return retval;
 727 }
 728
 729 static int snd_compr_resume(struct snd_compr_stream *stream)
 730 {
 731         int retval;
 732
 733         switch (stream->runtime->state) {
 734         case SNDRV_PCM_STATE_PAUSED:
 735                 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 736                 if (!retval)
 737                         stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
 738                 break;
 739         case SNDRV_PCM_STATE_DRAINING:
 740                 if (!stream->pause_in_draining)
 741                         return -EPERM;
 742                 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 743                 if (!retval)
 744                         stream->pause_in_draining = false;
 745                 break;
 746         default:
 747                 return -EPERM;
 748         }
 749         return retval;
 750 }
 751
 752 static int snd_compr_start(struct snd_compr_stream *stream)
 753 {
 754         int retval;
 755
 756         switch (stream->runtime->state) {
 757         case SNDRV_PCM_STATE_SETUP:
 758                 if (stream->direction != SND_COMPRESS_CAPTURE)
 759                         return -EPERM;
 760                 break;
 761         case SNDRV_PCM_STATE_PREPARED:
 762                 break;
 763         default:
 764                 return -EPERM;
 765         }
 766
 767         retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
 768         if (!retval)
 769                 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
 770         return retval;
 771 }
 772
 773 static int snd_compr_stop(struct snd_compr_stream *stream)
 774 {
 775         int retval;
 776
 777         switch (stream->runtime->state) {
 778         case SNDRV_PCM_STATE_OPEN:
 779         case SNDRV_PCM_STATE_SETUP:
 780         case SNDRV_PCM_STATE_PREPARED:
 781                 return -EPERM;
 782         default:
 783                 break;
 784         }
 785
 786         retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
 787         if (!retval) {
 788                 /* clear flags and stop any drain wait */
 789                 stream->partial_drain = false;
 790                 stream->metadata_set = false;
 791                 stream->pause_in_draining = false;
 792                 snd_compr_drain_notify(stream);
 793                 stream->runtime->total_bytes_available = 0;
 794                 stream->runtime->total_bytes_transferred = 0;
 795         }
 796         return retval;
 797 }
 798
 799 static void error_delayed_work(struct work_struct *work)
 800 {
 801         struct snd_compr_stream *stream;
 802
 803         stream = container_of(work, struct snd_compr_stream, error_work.work);
 804
 805         mutex_lock(&stream->device->lock);
 806
 807         stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
 808         wake_up(&stream->runtime->sleep);
 809
 810         mutex_unlock(&stream->device->lock);
 811 }
 812
 813 /*
 814  * snd_compr_stop_error: Report a fatal error on a stream
 815  * @stream: pointer to stream
 816  * @state: state to transition the stream to
 817  *
 818  * Stop the stream and set its state.
 819  *
 820  * Should be called with compressed device lock held.
 821  */
 822 int snd_compr_stop_error(struct snd_compr_stream *stream,
 823                          snd_pcm_state_t state)
 824 {
 825         if (stream->runtime->state == state)
 826                 return 0;
 827
 828         stream->runtime->state = state;
 829
 830         pr_debug("Changing state to: %d\n", state);
 831
 832         queue_delayed_work(system_power_efficient_wq, &stream->error_work, 0);
 833
 834         return 0;
 835 }
 836 EXPORT_SYMBOL_GPL(snd_compr_stop_error);
 837
 838 static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
 839 {
 840         int ret;
 841
 842         /*
 843          * We are called with lock held. So drop the lock while we wait for
 844          * drain complete notification from the driver
 845          *
 846          * It is expected that driver will notify the drain completion and then
 847          * stream will be moved to SETUP state, even if draining resulted in an
 848          * error. We can trigger next track after this.
 849          */
 850         stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
 851         mutex_unlock(&stream->device->lock);
 852
 853         /* we wait for drain to complete here, drain can return when
 854          * interruption occurred, wait returned error or success.
 855          * For the first two cases we don't do anything different here and
 856          * return after waking up
 857          */
 858
 859         ret = wait_event_interruptible(stream->runtime->sleep,
 860                         (stream->runtime->state != SNDRV_PCM_STATE_DRAINING));
 861         if (ret == -ERESTARTSYS)
 862                 pr_debug("wait aborted by a signal\n");
 863         else if (ret)
 864                 pr_debug("wait for drain failed with %d\n", ret);
 865
 866
 867         wake_up(&stream->runtime->sleep);
 868         mutex_lock(&stream->device->lock);
 869
 870         return ret;
 871 }
 872
 873 static int snd_compr_drain(struct snd_compr_stream *stream)
 874 {
 875         int retval;
 876
 877         switch (stream->runtime->state) {
 878         case SNDRV_PCM_STATE_OPEN:
 879         case SNDRV_PCM_STATE_SETUP:
 880         case SNDRV_PCM_STATE_PREPARED:
 881         case SNDRV_PCM_STATE_PAUSED:
 882                 return -EPERM;
 883         case SNDRV_PCM_STATE_XRUN:
 884                 return -EPIPE;
 885         default:
 886                 break;
 887         }
 888
 889         retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
 890         if (retval) {
 891                 pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
 892                 wake_up(&stream->runtime->sleep);
 893                 return retval;
 894         }
 895
 896         return snd_compress_wait_for_drain(stream);
 897 }
 898
 899 static int snd_compr_next_track(struct snd_compr_stream *stream)
 900 {
 901         int retval;
 902
 903         /* only a running stream can transition to next track */
 904         if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
 905                 return -EPERM;
 906
 907         /* next track doesn't have any meaning for capture streams */
 908         if (stream->direction == SND_COMPRESS_CAPTURE)
 909                 return -EPERM;
 910
 911         /* you can signal next track if this is intended to be a gapless stream
 912          * and current track metadata is set
 913          */
 914         if (stream->metadata_set == false)
 915                 return -EPERM;
 916
 917         retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
 918         if (retval != 0)
 919                 return retval;
 920         stream->metadata_set = false;
 921         stream->next_track = true;
 922         return 0;
 923 }
 924
 925 static int snd_compr_partial_drain(struct snd_compr_stream *stream)
 926 {
 927         int retval;
 928
 929         switch (stream->runtime->state) {
 930         case SNDRV_PCM_STATE_OPEN:
 931         case SNDRV_PCM_STATE_SETUP:
 932         case SNDRV_PCM_STATE_PREPARED:
 933         case SNDRV_PCM_STATE_PAUSED:
 934                 return -EPERM;
 935         case SNDRV_PCM_STATE_XRUN:
 936                 return -EPIPE;
 937         default:
 938                 break;
 939         }
 940
 941         /* partial drain doesn't have any meaning for capture streams */
 942         if (stream->direction == SND_COMPRESS_CAPTURE)
 943                 return -EPERM;
 944
 945         /* stream can be drained only when next track has been signalled */
 946         if (stream->next_track == false)
 947                 return -EPERM;
 948
 949         stream->partial_drain = true;
 950         retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
 951         if (retval) {
 952                 pr_debug("Partial drain returned failure\n");
 953                 wake_up(&stream->runtime->sleep);
 954                 return retval;
 955         }
 956
 957         stream->next_track = false;
 958         return snd_compress_wait_for_drain(stream);
 959 }
 960
 961 static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 962 {
 963         struct snd_compr_file *data = f->private_data;
 964         struct snd_compr_stream *stream;
 965         int retval = -ENOTTY;
 966
 967         if (snd_BUG_ON(!data))
 968                 return -EFAULT;
 969
 970         stream = &data->stream;
 971
 972         mutex_lock(&stream->device->lock);
 973         switch (_IOC_NR(cmd)) {
 974         case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
 975                 retval = put_user(SNDRV_COMPRESS_VERSION,
 976                                 (int __user *)arg) ? -EFAULT : 0;
 977                 break;
 978         case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
 979                 retval = snd_compr_get_caps(stream, arg);
 980                 break;
 981 #ifndef COMPR_CODEC_CAPS_OVERFLOW
 982         case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
 983                 retval = snd_compr_get_codec_caps(stream, arg);
 984                 break;
 985 #endif
 986         case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
 987                 retval = snd_compr_set_params(stream, arg);
 988                 break;
 989         case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
 990                 retval = snd_compr_get_params(stream, arg);
 991                 break;
 992         case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
 993                 retval = snd_compr_set_metadata(stream, arg);
 994                 break;
 995         case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
 996                 retval = snd_compr_get_metadata(stream, arg);
 997                 break;
 998         case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
 999                 retval = snd_compr_tstamp(stream, arg);
1000                 break;
1001         case _IOC_NR(SNDRV_COMPRESS_AVAIL):
1002                 retval = snd_compr_ioctl_avail(stream, arg);
1003                 break;
1004         case _IOC_NR(SNDRV_COMPRESS_PAUSE):
1005                 retval = snd_compr_pause(stream);
1006                 break;
1007         case _IOC_NR(SNDRV_COMPRESS_RESUME):
1008                 retval = snd_compr_resume(stream);
1009                 break;
1010         case _IOC_NR(SNDRV_COMPRESS_START):
1011                 retval = snd_compr_start(stream);
1012                 break;
1013         case _IOC_NR(SNDRV_COMPRESS_STOP):
1014                 retval = snd_compr_stop(stream);
1015                 break;
1016         case _IOC_NR(SNDRV_COMPRESS_DRAIN):
1017                 retval = snd_compr_drain(stream);
1018                 break;
1019         case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
1020                 retval = snd_compr_partial_drain(stream);
1021                 break;
1022         case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
1023                 retval = snd_compr_next_track(stream);
1024                 break;
1025
1026         }
1027         mutex_unlock(&stream->device->lock);
1028         return retval;
1029 }
1030
1031 /* support of 32bit userspace on 64bit platforms */
1032 #ifdef CONFIG_COMPAT
1033 static long snd_compr_ioctl_compat(struct file *file, unsigned int cmd,
1034                                                 unsigned long arg)
1035 {
1036         return snd_compr_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
1037 }
1038 #endif
1039
1040 static const struct file_operations snd_compr_file_ops = {
1041                 .owner =        THIS_MODULE,
1042                 .open =         snd_compr_open,
1043                 .release =      snd_compr_free,
1044                 .write =        snd_compr_write,
1045                 .read =         snd_compr_read,
1046                 .unlocked_ioctl = snd_compr_ioctl,
1047 #ifdef CONFIG_COMPAT
1048                 .compat_ioctl = snd_compr_ioctl_compat,
1049 #endif
1050                 .mmap =         snd_compr_mmap,
1051                 .poll =         snd_compr_poll,
1052 };
1053
1054 static int snd_compress_dev_register(struct snd_device *device)
1055 {
1056         int ret;
1057         struct snd_compr *compr;
1058
1059         if (snd_BUG_ON(!device || !device->device_data))
1060                 return -EBADFD;
1061         compr = device->device_data;
1062
1063         pr_debug("reg device %s, direction %d\n", compr->name,
1064                         compr->direction);
1065         /* register compressed device */
1066         ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS,
1067                                   compr->card, compr->device,
1068                                   &snd_compr_file_ops, compr, &compr->dev);
1069         if (ret < 0) {
1070                 pr_err("snd_register_device failed %d\n", ret);
1071                 return ret;
1072         }
1073         return ret;
1074
1075 }
1076
1077 static int snd_compress_dev_disconnect(struct snd_device *device)
1078 {
1079         struct snd_compr *compr;
1080
1081         compr = device->device_data;
1082         snd_unregister_device(&compr->dev);
1083         return 0;
1084 }
1085
1086 #ifdef CONFIG_SND_VERBOSE_PROCFS
1087 static void snd_compress_proc_info_read(struct snd_info_entry *entry,
1088                                         struct snd_info_buffer *buffer)
1089 {
1090         struct snd_compr *compr = (struct snd_compr *)entry->private_data;
1091
1092         snd_iprintf(buffer, "card: %d\n", compr->card->number);
1093         snd_iprintf(buffer, "device: %d\n", compr->device);
1094         snd_iprintf(buffer, "stream: %s\n",
1095                         compr->direction == SND_COMPRESS_PLAYBACK
1096                                 ? "PLAYBACK" : "CAPTURE");
1097         snd_iprintf(buffer, "id: %s\n", compr->id);
1098 }
1099
1100 static int snd_compress_proc_init(struct snd_compr *compr)
1101 {
1102         struct snd_info_entry *entry;
1103         char name[16];
1104
1105         sprintf(name, "compr%i", compr->device);
1106         entry = snd_info_create_card_entry(compr->card, name,
1107                                            compr->card->proc_root);
1108         if (!entry)
1109                 return -ENOMEM;
1110         entry->mode = S_IFDIR | 0555;
1111         compr->proc_root = entry;
1112
1113         entry = snd_info_create_card_entry(compr->card, "info",
1114                                            compr->proc_root);
1115         if (entry)
1116                 snd_info_set_text_ops(entry, compr,
1117                                       snd_compress_proc_info_read);
1118         compr->proc_info_entry = entry;
1119
1120         return 0;
1121 }
1122
1123 static void snd_compress_proc_done(struct snd_compr *compr)
1124 {
1125         snd_info_free_entry(compr->proc_info_entry);
1126         compr->proc_info_entry = NULL;
1127         snd_info_free_entry(compr->proc_root);
1128         compr->proc_root = NULL;
1129 }
1130
1131 static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
1132 {
1133         strscpy(compr->id, id, sizeof(compr->id));
1134 }
1135 #else
1136 static inline int snd_compress_proc_init(struct snd_compr *compr)
1137 {
1138         return 0;
1139 }
1140
1141 static inline void snd_compress_proc_done(struct snd_compr *compr)
1142 {
1143 }
1144
1145 static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
1146 {
1147 }
1148 #endif
1149
1150 static int snd_compress_dev_free(struct snd_device *device)
1151 {
1152         struct snd_compr *compr;
1153
1154         compr = device->device_data;
1155         snd_compress_proc_done(compr);
1156         put_device(&compr->dev);
1157         return 0;
1158 }
1159
1160 /*
1161  * snd_compress_new: create new compress device
1162  * @card: sound card pointer
1163  * @device: device number
1164  * @dirn: device direction, should be of type enum snd_compr_direction
1165  * @compr: compress device pointer
1166  */
1167 int snd_compress_new(struct snd_card *card, int device,
1168                         int dirn, const char *id, struct snd_compr *compr)
1169 {
1170         static const struct snd_device_ops ops = {
1171                 .dev_free = snd_compress_dev_free,
1172                 .dev_register = snd_compress_dev_register,
1173                 .dev_disconnect = snd_compress_dev_disconnect,
1174         };
1175         int ret;
1176
1177         compr->card = card;
1178         compr->device = device;
1179         compr->direction = dirn;
1180         mutex_init(&compr->lock);
1181
1182         snd_compress_set_id(compr, id);
1183
1184         snd_device_initialize(&compr->dev, card);
1185         dev_set_name(&compr->dev, "comprC%iD%i", card->number, device);
1186
1187         ret = snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
1188         if (ret == 0)
1189                 snd_compress_proc_init(compr);
1190
1191         return ret;
1192 }
1193 EXPORT_SYMBOL_GPL(snd_compress_new);
1194
1195 MODULE_DESCRIPTION("ALSA Compressed offload framework");
1196 MODULE_AUTHOR("Vinod Koul <[email protected]>");
1197 MODULE_LICENSE("GPL v2");