1 /* 2 * compress_core.c - compress offload core 3 * 4 * Copyright (C) 2011 Intel Corporation 5 * Authors: Vinod Koul <vinod.koul@linux.intel.com> 6 * Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> 7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; version 2 of the License. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, write to the Free Software Foundation, Inc., 20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 21 * 22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 23 * 24 */ 25 #define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__ 26 #define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt) 27 28 #include <linux/file.h> 29 #include <linux/fs.h> 30 #include <linux/list.h> 31 #include <linux/mm.h> 32 #include <linux/mutex.h> 33 #include <linux/poll.h> 34 #include <linux/slab.h> 35 #include <linux/sched.h> 36 #include <linux/uio.h> 37 #include <linux/uaccess.h> 38 #include <linux/module.h> 39 #include <sound/core.h> 40 #include <sound/initval.h> 41 #include <sound/compress_params.h> 42 #include <sound/compress_offload.h> 43 #include <sound/compress_driver.h> 44 45 /* TODO: 46 * - add substream support for multiple devices in case of 47 * SND_DYNAMIC_MINORS is not used 48 * - Multiple node representation 49 * driver should be able to register multiple nodes 50 */ 51 52 static DEFINE_MUTEX(device_mutex); 53 54 struct snd_compr_file { 55 unsigned long caps; 56 struct snd_compr_stream stream; 57 }; 58 59 /* 60 * a note on stream states used: 61 * we use follwing states in the compressed core 62 * SNDRV_PCM_STATE_OPEN: When stream has been opened. 63 * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by 64 * calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this 65 * state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain. 66 * SNDRV_PCM_STATE_RUNNING: When stream has been started and is 67 * decoding/encoding and rendering/capturing data. 68 * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done 69 * by calling SNDRV_COMPRESS_DRAIN. 70 * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling 71 * SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling 72 * SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively. 73 */ 74 static int snd_compr_open(struct inode *inode, struct file *f) 75 { 76 struct snd_compr *compr; 77 struct snd_compr_file *data; 78 struct snd_compr_runtime *runtime; 79 enum snd_compr_direction dirn; 80 int maj = imajor(inode); 81 int ret; 82 83 if ((f->f_flags & O_ACCMODE) == O_WRONLY) 84 dirn = SND_COMPRESS_PLAYBACK; 85 else if ((f->f_flags & O_ACCMODE) == O_RDONLY) 86 dirn = SND_COMPRESS_CAPTURE; 87 else 88 return -EINVAL; 89 90 if (maj == snd_major) 91 compr = snd_lookup_minor_data(iminor(inode), 92 SNDRV_DEVICE_TYPE_COMPRESS); 93 else 94 return -EBADFD; 95 96 if (compr == NULL) { 97 pr_err("no device data!!!\n"); 98 return -ENODEV; 99 } 100 101 if (dirn != compr->direction) { 102 pr_err("this device doesn't support this direction\n"); 103 snd_card_unref(compr->card); 104 return -EINVAL; 105 } 106 107 data = kzalloc(sizeof(*data), GFP_KERNEL); 108 if (!data) { 109 snd_card_unref(compr->card); 110 return -ENOMEM; 111 } 112 data->stream.ops = compr->ops; 113 data->stream.direction = dirn; 114 data->stream.private_data = compr->private_data; 115 data->stream.device = compr; 116 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 117 if (!runtime) { 118 kfree(data); 119 snd_card_unref(compr->card); 120 return -ENOMEM; 121 } 122 runtime->state = SNDRV_PCM_STATE_OPEN; 123 init_waitqueue_head(&runtime->sleep); 124 data->stream.runtime = runtime; 125 f->private_data = (void *)data; 126 mutex_lock(&compr->lock); 127 ret = compr->ops->open(&data->stream); 128 mutex_unlock(&compr->lock); 129 if (ret) { 130 kfree(runtime); 131 kfree(data); 132 } 133 snd_card_unref(compr->card); 134 return 0; 135 } 136 137 static int snd_compr_free(struct inode *inode, struct file *f) 138 { 139 struct snd_compr_file *data = f->private_data; 140 data->stream.ops->free(&data->stream); 141 kfree(data->stream.runtime->buffer); 142 kfree(data->stream.runtime); 143 kfree(data); 144 return 0; 145 } 146 147 static void snd_compr_update_tstamp(struct snd_compr_stream *stream, 148 struct snd_compr_tstamp *tstamp) 149 { 150 if (!stream->ops->pointer) 151 return; 152 stream->ops->pointer(stream, tstamp); 153 pr_debug("dsp consumed till %d total %d bytes\n", 154 tstamp->byte_offset, tstamp->copied_total); 155 stream->runtime->hw_pointer = tstamp->byte_offset; 156 stream->runtime->total_bytes_transferred = tstamp->copied_total; 157 } 158 159 static size_t snd_compr_calc_avail(struct snd_compr_stream *stream, 160 struct snd_compr_avail *avail) 161 { 162 long avail_calc; /*this needs to be signed variable */ 163 164 snd_compr_update_tstamp(stream, &avail->tstamp); 165 166 /* FIXME: This needs to be different for capture stream, 167 available is # of compressed data, for playback it's 168 remainder of buffer */ 169 170 if (stream->runtime->total_bytes_available == 0 && 171 stream->runtime->state == SNDRV_PCM_STATE_SETUP) { 172 pr_debug("detected init and someone forgot to do a write\n"); 173 return stream->runtime->buffer_size; 174 } 175 pr_debug("app wrote %lld, DSP consumed %lld\n", 176 stream->runtime->total_bytes_available, 177 stream->runtime->total_bytes_transferred); 178 if (stream->runtime->total_bytes_available == 179 stream->runtime->total_bytes_transferred) { 180 pr_debug("both pointers are same, returning full avail\n"); 181 return stream->runtime->buffer_size; 182 } 183 184 /* FIXME: this routine isn't consistent, in one test we use 185 * cumulative values and in the other byte offsets. Do we 186 * really need the byte offsets if the cumulative values have 187 * been updated? In the PCM interface app_ptr and hw_ptr are 188 * already cumulative */ 189 190 avail_calc = stream->runtime->buffer_size - 191 (stream->runtime->app_pointer - stream->runtime->hw_pointer); 192 pr_debug("calc avail as %ld, app_ptr %lld, hw+ptr %lld\n", avail_calc, 193 stream->runtime->app_pointer, 194 stream->runtime->hw_pointer); 195 if (avail_calc >= stream->runtime->buffer_size) 196 avail_calc -= stream->runtime->buffer_size; 197 pr_debug("ret avail as %ld\n", avail_calc); 198 avail->avail = avail_calc; 199 return avail_calc; 200 } 201 202 static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream) 203 { 204 struct snd_compr_avail avail; 205 206 return snd_compr_calc_avail(stream, &avail); 207 } 208 209 static int 210 snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg) 211 { 212 struct snd_compr_avail ioctl_avail; 213 size_t avail; 214 215 avail = snd_compr_calc_avail(stream, &ioctl_avail); 216 ioctl_avail.avail = avail; 217 218 if (copy_to_user((__u64 __user *)arg, 219 &ioctl_avail, sizeof(ioctl_avail))) 220 return -EFAULT; 221 return 0; 222 } 223 224 static int snd_compr_write_data(struct snd_compr_stream *stream, 225 const char __user *buf, size_t count) 226 { 227 void *dstn; 228 size_t copy; 229 struct snd_compr_runtime *runtime = stream->runtime; 230 231 dstn = runtime->buffer + runtime->app_pointer; 232 pr_debug("copying %ld at %lld\n", 233 (unsigned long)count, runtime->app_pointer); 234 if (count < runtime->buffer_size - runtime->app_pointer) { 235 if (copy_from_user(dstn, buf, count)) 236 return -EFAULT; 237 runtime->app_pointer += count; 238 } else { 239 copy = runtime->buffer_size - runtime->app_pointer; 240 if (copy_from_user(dstn, buf, copy)) 241 return -EFAULT; 242 if (copy_from_user(runtime->buffer, buf + copy, count - copy)) 243 return -EFAULT; 244 runtime->app_pointer = count - copy; 245 } 246 /* if DSP cares, let it know data has been written */ 247 if (stream->ops->ack) 248 stream->ops->ack(stream, count); 249 return count; 250 } 251 252 static ssize_t snd_compr_write(struct file *f, const char __user *buf, 253 size_t count, loff_t *offset) 254 { 255 struct snd_compr_file *data = f->private_data; 256 struct snd_compr_stream *stream; 257 size_t avail; 258 int retval; 259 260 if (snd_BUG_ON(!data)) 261 return -EFAULT; 262 263 stream = &data->stream; 264 mutex_lock(&stream->device->lock); 265 /* write is allowed when stream is running or has been steup */ 266 if (stream->runtime->state != SNDRV_PCM_STATE_SETUP && 267 stream->runtime->state != SNDRV_PCM_STATE_RUNNING) { 268 mutex_unlock(&stream->device->lock); 269 return -EBADFD; 270 } 271 272 avail = snd_compr_get_avail(stream); 273 pr_debug("avail returned %ld\n", (unsigned long)avail); 274 /* calculate how much we can write to buffer */ 275 if (avail > count) 276 avail = count; 277 278 if (stream->ops->copy) 279 retval = stream->ops->copy(stream, buf, avail); 280 else 281 retval = snd_compr_write_data(stream, buf, avail); 282 if (retval > 0) 283 stream->runtime->total_bytes_available += retval; 284 285 /* while initiating the stream, write should be called before START 286 * call, so in setup move state */ 287 if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) { 288 stream->runtime->state = SNDRV_PCM_STATE_PREPARED; 289 pr_debug("stream prepared, Houston we are good to go\n"); 290 } 291 292 mutex_unlock(&stream->device->lock); 293 return retval; 294 } 295 296 297 static ssize_t snd_compr_read(struct file *f, char __user *buf, 298 size_t count, loff_t *offset) 299 { 300 return -ENXIO; 301 } 302 303 static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma) 304 { 305 return -ENXIO; 306 } 307 308 static inline int snd_compr_get_poll(struct snd_compr_stream *stream) 309 { 310 if (stream->direction == SND_COMPRESS_PLAYBACK) 311 return POLLOUT | POLLWRNORM; 312 else 313 return POLLIN | POLLRDNORM; 314 } 315 316 static unsigned int snd_compr_poll(struct file *f, poll_table *wait) 317 { 318 struct snd_compr_file *data = f->private_data; 319 struct snd_compr_stream *stream; 320 size_t avail; 321 int retval = 0; 322 323 if (snd_BUG_ON(!data)) 324 return -EFAULT; 325 stream = &data->stream; 326 if (snd_BUG_ON(!stream)) 327 return -EFAULT; 328 329 mutex_lock(&stream->device->lock); 330 if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED || 331 stream->runtime->state == SNDRV_PCM_STATE_OPEN) { 332 retval = -EBADFD; 333 goto out; 334 } 335 poll_wait(f, &stream->runtime->sleep, wait); 336 337 avail = snd_compr_get_avail(stream); 338 pr_debug("avail is %ld\n", (unsigned long)avail); 339 /* check if we have at least one fragment to fill */ 340 switch (stream->runtime->state) { 341 case SNDRV_PCM_STATE_DRAINING: 342 /* stream has been woken up after drain is complete 343 * draining done so set stream state to stopped 344 */ 345 retval = snd_compr_get_poll(stream); 346 stream->runtime->state = SNDRV_PCM_STATE_SETUP; 347 break; 348 case SNDRV_PCM_STATE_RUNNING: 349 case SNDRV_PCM_STATE_PREPARED: 350 case SNDRV_PCM_STATE_PAUSED: 351 if (avail >= stream->runtime->fragment_size) 352 retval = snd_compr_get_poll(stream); 353 break; 354 default: 355 if (stream->direction == SND_COMPRESS_PLAYBACK) 356 retval = POLLOUT | POLLWRNORM | POLLERR; 357 else 358 retval = POLLIN | POLLRDNORM | POLLERR; 359 break; 360 } 361 out: 362 mutex_unlock(&stream->device->lock); 363 return retval; 364 } 365 366 static int 367 snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg) 368 { 369 int retval; 370 struct snd_compr_caps caps; 371 372 if (!stream->ops->get_caps) 373 return -ENXIO; 374 375 retval = stream->ops->get_caps(stream, &caps); 376 if (retval) 377 goto out; 378 if (copy_to_user((void __user *)arg, &caps, sizeof(caps))) 379 retval = -EFAULT; 380 out: 381 return retval; 382 } 383 384 static int 385 snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg) 386 { 387 int retval; 388 struct snd_compr_codec_caps *caps; 389 390 if (!stream->ops->get_codec_caps) 391 return -ENXIO; 392 393 caps = kmalloc(sizeof(*caps), GFP_KERNEL); 394 if (!caps) 395 return -ENOMEM; 396 397 retval = stream->ops->get_codec_caps(stream, caps); 398 if (retval) 399 goto out; 400 if (copy_to_user((void __user *)arg, caps, sizeof(*caps))) 401 retval = -EFAULT; 402 403 out: 404 kfree(caps); 405 return retval; 406 } 407 408 /* revisit this with snd_pcm_preallocate_xxx */ 409 static int snd_compr_allocate_buffer(struct snd_compr_stream *stream, 410 struct snd_compr_params *params) 411 { 412 unsigned int buffer_size; 413 void *buffer; 414 415 buffer_size = params->buffer.fragment_size * params->buffer.fragments; 416 if (stream->ops->copy) { 417 buffer = NULL; 418 /* if copy is defined the driver will be required to copy 419 * the data from core 420 */ 421 } else { 422 buffer = kmalloc(buffer_size, GFP_KERNEL); 423 if (!buffer) 424 return -ENOMEM; 425 } 426 stream->runtime->fragment_size = params->buffer.fragment_size; 427 stream->runtime->fragments = params->buffer.fragments; 428 stream->runtime->buffer = buffer; 429 stream->runtime->buffer_size = buffer_size; 430 return 0; 431 } 432 433 static int snd_compress_check_input(struct snd_compr_params *params) 434 { 435 /* first let's check the buffer parameter's */ 436 if (params->buffer.fragment_size == 0 || 437 params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size) 438 return -EINVAL; 439 440 /* now codec parameters */ 441 if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX) 442 return -EINVAL; 443 444 if (params->codec.ch_in == 0 || params->codec.ch_out == 0) 445 return -EINVAL; 446 447 if (!(params->codec.sample_rate & SNDRV_PCM_RATE_8000_192000)) 448 return -EINVAL; 449 450 return 0; 451 } 452 453 static int 454 snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg) 455 { 456 struct snd_compr_params *params; 457 int retval; 458 459 if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) { 460 /* 461 * we should allow parameter change only when stream has been 462 * opened not in other cases 463 */ 464 params = kmalloc(sizeof(*params), GFP_KERNEL); 465 if (!params) 466 return -ENOMEM; 467 if (copy_from_user(params, (void __user *)arg, sizeof(*params))) { 468 retval = -EFAULT; 469 goto out; 470 } 471 472 retval = snd_compress_check_input(params); 473 if (retval) 474 goto out; 475 476 retval = snd_compr_allocate_buffer(stream, params); 477 if (retval) { 478 retval = -ENOMEM; 479 goto out; 480 } 481 482 retval = stream->ops->set_params(stream, params); 483 if (retval) 484 goto out; 485 stream->runtime->state = SNDRV_PCM_STATE_SETUP; 486 } else { 487 return -EPERM; 488 } 489 out: 490 kfree(params); 491 return retval; 492 } 493 494 static int 495 snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg) 496 { 497 struct snd_codec *params; 498 int retval; 499 500 if (!stream->ops->get_params) 501 return -EBADFD; 502 503 params = kmalloc(sizeof(*params), GFP_KERNEL); 504 if (!params) 505 return -ENOMEM; 506 retval = stream->ops->get_params(stream, params); 507 if (retval) 508 goto out; 509 if (copy_to_user((char __user *)arg, params, sizeof(*params))) 510 retval = -EFAULT; 511 512 out: 513 kfree(params); 514 return retval; 515 } 516 517 static inline int 518 snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg) 519 { 520 struct snd_compr_tstamp tstamp; 521 522 snd_compr_update_tstamp(stream, &tstamp); 523 return copy_to_user((struct snd_compr_tstamp __user *)arg, 524 &tstamp, sizeof(tstamp)) ? -EFAULT : 0; 525 } 526 527 static int snd_compr_pause(struct snd_compr_stream *stream) 528 { 529 int retval; 530 531 if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) 532 return -EPERM; 533 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH); 534 if (!retval) 535 stream->runtime->state = SNDRV_PCM_STATE_PAUSED; 536 return retval; 537 } 538 539 static int snd_compr_resume(struct snd_compr_stream *stream) 540 { 541 int retval; 542 543 if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED) 544 return -EPERM; 545 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 546 if (!retval) 547 stream->runtime->state = SNDRV_PCM_STATE_RUNNING; 548 return retval; 549 } 550 551 static int snd_compr_start(struct snd_compr_stream *stream) 552 { 553 int retval; 554 555 if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED) 556 return -EPERM; 557 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START); 558 if (!retval) 559 stream->runtime->state = SNDRV_PCM_STATE_RUNNING; 560 return retval; 561 } 562 563 static int snd_compr_stop(struct snd_compr_stream *stream) 564 { 565 int retval; 566 567 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED || 568 stream->runtime->state == SNDRV_PCM_STATE_SETUP) 569 return -EPERM; 570 retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP); 571 if (!retval) { 572 stream->runtime->state = SNDRV_PCM_STATE_SETUP; 573 wake_up(&stream->runtime->sleep); 574 stream->runtime->hw_pointer = 0; 575 stream->runtime->app_pointer = 0; 576 stream->runtime->total_bytes_available = 0; 577 stream->runtime->total_bytes_transferred = 0; 578 } 579 return retval; 580 } 581 582 static int snd_compr_drain(struct snd_compr_stream *stream) 583 { 584 int retval; 585 586 if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED || 587 stream->runtime->state == SNDRV_PCM_STATE_SETUP) 588 return -EPERM; 589 retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN); 590 if (!retval) { 591 stream->runtime->state = SNDRV_PCM_STATE_DRAINING; 592 wake_up(&stream->runtime->sleep); 593 } 594 return retval; 595 } 596 597 static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg) 598 { 599 struct snd_compr_file *data = f->private_data; 600 struct snd_compr_stream *stream; 601 int retval = -ENOTTY; 602 603 if (snd_BUG_ON(!data)) 604 return -EFAULT; 605 stream = &data->stream; 606 if (snd_BUG_ON(!stream)) 607 return -EFAULT; 608 mutex_lock(&stream->device->lock); 609 switch (_IOC_NR(cmd)) { 610 case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION): 611 put_user(SNDRV_COMPRESS_VERSION, 612 (int __user *)arg) ? -EFAULT : 0; 613 break; 614 case _IOC_NR(SNDRV_COMPRESS_GET_CAPS): 615 retval = snd_compr_get_caps(stream, arg); 616 break; 617 case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS): 618 retval = snd_compr_get_codec_caps(stream, arg); 619 break; 620 case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS): 621 retval = snd_compr_set_params(stream, arg); 622 break; 623 case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS): 624 retval = snd_compr_get_params(stream, arg); 625 break; 626 case _IOC_NR(SNDRV_COMPRESS_TSTAMP): 627 retval = snd_compr_tstamp(stream, arg); 628 break; 629 case _IOC_NR(SNDRV_COMPRESS_AVAIL): 630 retval = snd_compr_ioctl_avail(stream, arg); 631 break; 632 case _IOC_NR(SNDRV_COMPRESS_PAUSE): 633 retval = snd_compr_pause(stream); 634 break; 635 case _IOC_NR(SNDRV_COMPRESS_RESUME): 636 retval = snd_compr_resume(stream); 637 break; 638 case _IOC_NR(SNDRV_COMPRESS_START): 639 retval = snd_compr_start(stream); 640 break; 641 case _IOC_NR(SNDRV_COMPRESS_STOP): 642 retval = snd_compr_stop(stream); 643 break; 644 case _IOC_NR(SNDRV_COMPRESS_DRAIN): 645 retval = snd_compr_drain(stream); 646 break; 647 } 648 mutex_unlock(&stream->device->lock); 649 return retval; 650 } 651 652 static const struct file_operations snd_compr_file_ops = { 653 .owner = THIS_MODULE, 654 .open = snd_compr_open, 655 .release = snd_compr_free, 656 .write = snd_compr_write, 657 .read = snd_compr_read, 658 .unlocked_ioctl = snd_compr_ioctl, 659 .mmap = snd_compr_mmap, 660 .poll = snd_compr_poll, 661 }; 662 663 static int snd_compress_dev_register(struct snd_device *device) 664 { 665 int ret = -EINVAL; 666 char str[16]; 667 struct snd_compr *compr; 668 669 if (snd_BUG_ON(!device || !device->device_data)) 670 return -EBADFD; 671 compr = device->device_data; 672 673 sprintf(str, "comprC%iD%i", compr->card->number, compr->device); 674 pr_debug("reg %s for device %s, direction %d\n", str, compr->name, 675 compr->direction); 676 /* register compressed device */ 677 ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card, 678 compr->device, &snd_compr_file_ops, compr, str); 679 if (ret < 0) { 680 pr_err("snd_register_device failed\n %d", ret); 681 return ret; 682 } 683 return ret; 684 685 } 686 687 static int snd_compress_dev_disconnect(struct snd_device *device) 688 { 689 struct snd_compr *compr; 690 691 compr = device->device_data; 692 snd_unregister_device(compr->direction, compr->card, compr->device); 693 return 0; 694 } 695 696 /* 697 * snd_compress_new: create new compress device 698 * @card: sound card pointer 699 * @device: device number 700 * @dirn: device direction, should be of type enum snd_compr_direction 701 * @compr: compress device pointer 702 */ 703 int snd_compress_new(struct snd_card *card, int device, 704 int dirn, struct snd_compr *compr) 705 { 706 static struct snd_device_ops ops = { 707 .dev_free = NULL, 708 .dev_register = snd_compress_dev_register, 709 .dev_disconnect = snd_compress_dev_disconnect, 710 }; 711 712 compr->card = card; 713 compr->device = device; 714 compr->direction = dirn; 715 return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops); 716 } 717 EXPORT_SYMBOL_GPL(snd_compress_new); 718 719 static int snd_compress_add_device(struct snd_compr *device) 720 { 721 int ret; 722 723 if (!device->card) 724 return -EINVAL; 725 726 /* register the card */ 727 ret = snd_card_register(device->card); 728 if (ret) 729 goto out; 730 return 0; 731 732 out: 733 pr_err("failed with %d\n", ret); 734 return ret; 735 736 } 737 738 static int snd_compress_remove_device(struct snd_compr *device) 739 { 740 return snd_card_free(device->card); 741 } 742 743 /** 744 * snd_compress_register - register compressed device 745 * 746 * @device: compressed device to register 747 */ 748 int snd_compress_register(struct snd_compr *device) 749 { 750 int retval; 751 752 if (device->name == NULL || device->dev == NULL || device->ops == NULL) 753 return -EINVAL; 754 755 pr_debug("Registering compressed device %s\n", device->name); 756 if (snd_BUG_ON(!device->ops->open)) 757 return -EINVAL; 758 if (snd_BUG_ON(!device->ops->free)) 759 return -EINVAL; 760 if (snd_BUG_ON(!device->ops->set_params)) 761 return -EINVAL; 762 if (snd_BUG_ON(!device->ops->trigger)) 763 return -EINVAL; 764 765 mutex_init(&device->lock); 766 767 /* register a compressed card */ 768 mutex_lock(&device_mutex); 769 retval = snd_compress_add_device(device); 770 mutex_unlock(&device_mutex); 771 return retval; 772 } 773 EXPORT_SYMBOL_GPL(snd_compress_register); 774 775 int snd_compress_deregister(struct snd_compr *device) 776 { 777 pr_debug("Removing compressed device %s\n", device->name); 778 mutex_lock(&device_mutex); 779 snd_compress_remove_device(device); 780 mutex_unlock(&device_mutex); 781 return 0; 782 } 783 EXPORT_SYMBOL_GPL(snd_compress_deregister); 784 785 static int __init snd_compress_init(void) 786 { 787 return 0; 788 } 789 790 static void __exit snd_compress_exit(void) 791 { 792 } 793 794 module_init(snd_compress_init); 795 module_exit(snd_compress_exit); 796 797 MODULE_DESCRIPTION("ALSA Compressed offload framework"); 798 MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>"); 799 MODULE_LICENSE("GPL v2"); 800