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