1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * oxfw_stream.c - a part of driver for OXFW970/971 based devices 4 * 5 * Copyright (c) 2014 Takashi Sakamoto 6 */ 7 8 #include "oxfw.h" 9 #include <linux/delay.h> 10 11 #define AVC_GENERIC_FRAME_MAXIMUM_BYTES 512 12 #define READY_TIMEOUT_MS 200 13 14 /* 15 * According to datasheet of Oxford Semiconductor: 16 * OXFW970: 32.0/44.1/48.0/96.0 Khz, 8 audio channels I/O 17 * OXFW971: 32.0/44.1/48.0/88.2/96.0/192.0 kHz, 16 audio channels I/O, MIDI I/O 18 */ 19 static const unsigned int oxfw_rate_table[] = { 20 [0] = 32000, 21 [1] = 44100, 22 [2] = 48000, 23 [3] = 88200, 24 [4] = 96000, 25 [5] = 192000, 26 }; 27 28 /* 29 * See Table 5.7 – Sampling frequency for Multi-bit Audio 30 * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA) 31 */ 32 static const unsigned int avc_stream_rate_table[] = { 33 [0] = 0x02, 34 [1] = 0x03, 35 [2] = 0x04, 36 [3] = 0x0a, 37 [4] = 0x05, 38 [5] = 0x07, 39 }; 40 41 static int set_rate(struct snd_oxfw *oxfw, unsigned int rate) 42 { 43 int err; 44 45 err = avc_general_set_sig_fmt(oxfw->unit, rate, 46 AVC_GENERAL_PLUG_DIR_IN, 0); 47 if (err < 0) 48 goto end; 49 50 if (oxfw->has_output) 51 err = avc_general_set_sig_fmt(oxfw->unit, rate, 52 AVC_GENERAL_PLUG_DIR_OUT, 0); 53 end: 54 return err; 55 } 56 57 static int set_stream_format(struct snd_oxfw *oxfw, struct amdtp_stream *s, 58 unsigned int rate, unsigned int pcm_channels) 59 { 60 u8 **formats; 61 struct snd_oxfw_stream_formation formation; 62 enum avc_general_plug_dir dir; 63 unsigned int len; 64 int i, err; 65 66 if (s == &oxfw->tx_stream) { 67 formats = oxfw->tx_stream_formats; 68 dir = AVC_GENERAL_PLUG_DIR_OUT; 69 } else { 70 formats = oxfw->rx_stream_formats; 71 dir = AVC_GENERAL_PLUG_DIR_IN; 72 } 73 74 /* Seek stream format for requirements. */ 75 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 76 err = snd_oxfw_stream_parse_format(formats[i], &formation); 77 if (err < 0) 78 return err; 79 80 if ((formation.rate == rate) && (formation.pcm == pcm_channels)) 81 break; 82 } 83 if (i == SND_OXFW_STREAM_FORMAT_ENTRIES) 84 return -EINVAL; 85 86 /* If assumed, just change rate. */ 87 if (oxfw->assumed) 88 return set_rate(oxfw, rate); 89 90 /* Calculate format length. */ 91 len = 5 + formats[i][4] * 2; 92 93 err = avc_stream_set_format(oxfw->unit, dir, 0, formats[i], len); 94 if (err < 0) 95 return err; 96 97 /* Some requests just after changing format causes freezing. */ 98 msleep(100); 99 100 return 0; 101 } 102 103 static int start_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 104 { 105 struct cmp_connection *conn; 106 int err; 107 108 if (stream == &oxfw->rx_stream) 109 conn = &oxfw->in_conn; 110 else 111 conn = &oxfw->out_conn; 112 113 err = cmp_connection_establish(conn); 114 if (err < 0) 115 return err; 116 117 err = amdtp_domain_add_stream(&oxfw->domain, stream, 118 conn->resources.channel, conn->speed); 119 if (err < 0) { 120 cmp_connection_break(conn); 121 return err; 122 } 123 124 return 0; 125 } 126 127 static int check_connection_used_by_others(struct snd_oxfw *oxfw, 128 struct amdtp_stream *stream) 129 { 130 struct cmp_connection *conn; 131 bool used; 132 int err; 133 134 if (stream == &oxfw->tx_stream) 135 conn = &oxfw->out_conn; 136 else 137 conn = &oxfw->in_conn; 138 139 err = cmp_connection_check_used(conn, &used); 140 if ((err >= 0) && used && !amdtp_stream_running(stream)) { 141 dev_err(&oxfw->unit->device, 142 "Connection established by others: %cPCR[%d]\n", 143 (conn->direction == CMP_OUTPUT) ? 'o' : 'i', 144 conn->pcr_index); 145 err = -EBUSY; 146 } 147 148 return err; 149 } 150 151 static int init_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 152 { 153 struct cmp_connection *conn; 154 enum cmp_direction c_dir; 155 enum amdtp_stream_direction s_dir; 156 unsigned int flags = CIP_UNAWARE_SYT; 157 int err; 158 159 if (!(oxfw->quirks & SND_OXFW_QUIRK_BLOCKING_TRANSMISSION)) 160 flags |= CIP_NONBLOCKING; 161 else 162 flags |= CIP_BLOCKING; 163 164 if (stream == &oxfw->tx_stream) { 165 conn = &oxfw->out_conn; 166 c_dir = CMP_OUTPUT; 167 s_dir = AMDTP_IN_STREAM; 168 169 if (oxfw->quirks & SND_OXFW_QUIRK_JUMBO_PAYLOAD) 170 flags |= CIP_JUMBO_PAYLOAD; 171 if (oxfw->quirks & SND_OXFW_QUIRK_WRONG_DBS) 172 flags |= CIP_WRONG_DBS; 173 } else { 174 conn = &oxfw->in_conn; 175 c_dir = CMP_INPUT; 176 s_dir = AMDTP_OUT_STREAM; 177 } 178 179 err = cmp_connection_init(conn, oxfw->unit, c_dir, 0); 180 if (err < 0) 181 return err; 182 183 err = amdtp_am824_init(stream, oxfw->unit, s_dir, flags); 184 if (err < 0) { 185 cmp_connection_destroy(conn); 186 return err; 187 } 188 189 return 0; 190 } 191 192 static int keep_resources(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 193 { 194 enum avc_general_plug_dir dir; 195 u8 **formats; 196 struct snd_oxfw_stream_formation formation; 197 struct cmp_connection *conn; 198 int i; 199 int err; 200 201 if (stream == &oxfw->rx_stream) { 202 dir = AVC_GENERAL_PLUG_DIR_IN; 203 formats = oxfw->rx_stream_formats; 204 conn = &oxfw->in_conn; 205 } else { 206 dir = AVC_GENERAL_PLUG_DIR_OUT; 207 formats = oxfw->tx_stream_formats; 208 conn = &oxfw->out_conn; 209 } 210 211 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation); 212 if (err < 0) 213 return err; 214 215 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 216 struct snd_oxfw_stream_formation fmt; 217 218 if (formats[i] == NULL) 219 break; 220 221 err = snd_oxfw_stream_parse_format(formats[i], &fmt); 222 if (err < 0) 223 return err; 224 225 if (fmt.rate == formation.rate && fmt.pcm == formation.pcm && 226 fmt.midi == formation.midi) 227 break; 228 } 229 if (i == SND_OXFW_STREAM_FORMAT_ENTRIES) 230 return -EINVAL; 231 232 // The stream should have one pcm channels at least. 233 if (formation.pcm == 0) 234 return -EINVAL; 235 236 err = amdtp_am824_set_parameters(stream, formation.rate, formation.pcm, 237 formation.midi * 8, false); 238 if (err < 0) 239 return err; 240 241 return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream)); 242 } 243 244 int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw, 245 struct amdtp_stream *stream, 246 unsigned int rate, unsigned int pcm_channels, 247 unsigned int frames_per_period, 248 unsigned int frames_per_buffer) 249 { 250 struct snd_oxfw_stream_formation formation; 251 enum avc_general_plug_dir dir; 252 int err; 253 254 // Considering JACK/FFADO streaming: 255 // TODO: This can be removed hwdep functionality becomes popular. 256 err = check_connection_used_by_others(oxfw, &oxfw->rx_stream); 257 if (err < 0) 258 return err; 259 if (oxfw->has_output) { 260 err = check_connection_used_by_others(oxfw, &oxfw->tx_stream); 261 if (err < 0) 262 return err; 263 } 264 265 if (stream == &oxfw->tx_stream) 266 dir = AVC_GENERAL_PLUG_DIR_OUT; 267 else 268 dir = AVC_GENERAL_PLUG_DIR_IN; 269 270 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation); 271 if (err < 0) 272 return err; 273 if (rate == 0) { 274 rate = formation.rate; 275 pcm_channels = formation.pcm; 276 } 277 if (formation.rate != rate || formation.pcm != pcm_channels) { 278 amdtp_domain_stop(&oxfw->domain); 279 280 cmp_connection_break(&oxfw->in_conn); 281 cmp_connection_release(&oxfw->in_conn); 282 283 if (oxfw->has_output) { 284 cmp_connection_break(&oxfw->out_conn); 285 cmp_connection_release(&oxfw->out_conn); 286 } 287 } 288 289 if (oxfw->substreams_count == 0 || 290 formation.rate != rate || formation.pcm != pcm_channels) { 291 err = set_stream_format(oxfw, stream, rate, pcm_channels); 292 if (err < 0) { 293 dev_err(&oxfw->unit->device, 294 "fail to set stream format: %d\n", err); 295 return err; 296 } 297 298 err = keep_resources(oxfw, &oxfw->rx_stream); 299 if (err < 0) 300 return err; 301 302 if (oxfw->has_output) { 303 err = keep_resources(oxfw, &oxfw->tx_stream); 304 if (err < 0) { 305 cmp_connection_release(&oxfw->in_conn); 306 return err; 307 } 308 } 309 310 err = amdtp_domain_set_events_per_period(&oxfw->domain, 311 frames_per_period, frames_per_buffer); 312 if (err < 0) { 313 cmp_connection_release(&oxfw->in_conn); 314 if (oxfw->has_output) 315 cmp_connection_release(&oxfw->out_conn); 316 return err; 317 } 318 } 319 320 return 0; 321 } 322 323 int snd_oxfw_stream_start_duplex(struct snd_oxfw *oxfw) 324 { 325 int err; 326 327 if (oxfw->substreams_count == 0) 328 return -EIO; 329 330 if (amdtp_streaming_error(&oxfw->rx_stream) || 331 amdtp_streaming_error(&oxfw->tx_stream)) { 332 amdtp_domain_stop(&oxfw->domain); 333 334 cmp_connection_break(&oxfw->in_conn); 335 if (oxfw->has_output) 336 cmp_connection_break(&oxfw->out_conn); 337 } 338 339 if (!amdtp_stream_running(&oxfw->rx_stream)) { 340 unsigned int tx_init_skip_cycles = 0; 341 bool replay_seq = false; 342 343 err = start_stream(oxfw, &oxfw->rx_stream); 344 if (err < 0) { 345 dev_err(&oxfw->unit->device, 346 "fail to prepare rx stream: %d\n", err); 347 goto error; 348 } 349 350 if (oxfw->has_output && 351 !amdtp_stream_running(&oxfw->tx_stream)) { 352 err = start_stream(oxfw, &oxfw->tx_stream); 353 if (err < 0) { 354 dev_err(&oxfw->unit->device, 355 "fail to prepare tx stream: %d\n", err); 356 goto error; 357 } 358 359 if (oxfw->quirks & SND_OXFW_QUIRK_JUMBO_PAYLOAD) { 360 // Just after changing sampling transfer frequency, many cycles are 361 // skipped for packet transmission. 362 tx_init_skip_cycles = 400; 363 } else { 364 replay_seq = true; 365 } 366 } 367 368 // NOTE: The device ignores presentation time expressed by the value of syt field 369 // of CIP header in received packets. The sequence of the number of data blocks per 370 // packet is important for media clock recovery. 371 err = amdtp_domain_start(&oxfw->domain, tx_init_skip_cycles, replay_seq, false); 372 if (err < 0) 373 goto error; 374 375 if (!amdtp_domain_wait_ready(&oxfw->domain, READY_TIMEOUT_MS)) { 376 err = -ETIMEDOUT; 377 goto error; 378 } 379 } 380 381 return 0; 382 error: 383 amdtp_domain_stop(&oxfw->domain); 384 385 cmp_connection_break(&oxfw->in_conn); 386 if (oxfw->has_output) 387 cmp_connection_break(&oxfw->out_conn); 388 389 return err; 390 } 391 392 void snd_oxfw_stream_stop_duplex(struct snd_oxfw *oxfw) 393 { 394 if (oxfw->substreams_count == 0) { 395 amdtp_domain_stop(&oxfw->domain); 396 397 cmp_connection_break(&oxfw->in_conn); 398 cmp_connection_release(&oxfw->in_conn); 399 400 if (oxfw->has_output) { 401 cmp_connection_break(&oxfw->out_conn); 402 cmp_connection_release(&oxfw->out_conn); 403 } 404 } 405 } 406 407 static void destroy_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 408 { 409 struct cmp_connection *conn; 410 411 if (stream == &oxfw->tx_stream) 412 conn = &oxfw->out_conn; 413 else 414 conn = &oxfw->in_conn; 415 416 amdtp_stream_destroy(stream); 417 cmp_connection_destroy(conn); 418 } 419 420 int snd_oxfw_stream_init_duplex(struct snd_oxfw *oxfw) 421 { 422 int err; 423 424 err = init_stream(oxfw, &oxfw->rx_stream); 425 if (err < 0) 426 return err; 427 428 if (oxfw->has_output) { 429 err = init_stream(oxfw, &oxfw->tx_stream); 430 if (err < 0) { 431 destroy_stream(oxfw, &oxfw->rx_stream); 432 return err; 433 } 434 } 435 436 err = amdtp_domain_init(&oxfw->domain); 437 if (err < 0) { 438 destroy_stream(oxfw, &oxfw->rx_stream); 439 if (oxfw->has_output) 440 destroy_stream(oxfw, &oxfw->tx_stream); 441 } 442 443 return err; 444 } 445 446 // This function should be called before starting the stream or after stopping 447 // the streams. 448 void snd_oxfw_stream_destroy_duplex(struct snd_oxfw *oxfw) 449 { 450 amdtp_domain_destroy(&oxfw->domain); 451 452 destroy_stream(oxfw, &oxfw->rx_stream); 453 454 if (oxfw->has_output) 455 destroy_stream(oxfw, &oxfw->tx_stream); 456 } 457 458 void snd_oxfw_stream_update_duplex(struct snd_oxfw *oxfw) 459 { 460 amdtp_domain_stop(&oxfw->domain); 461 462 cmp_connection_break(&oxfw->in_conn); 463 464 amdtp_stream_pcm_abort(&oxfw->rx_stream); 465 466 if (oxfw->has_output) { 467 cmp_connection_break(&oxfw->out_conn); 468 469 amdtp_stream_pcm_abort(&oxfw->tx_stream); 470 } 471 } 472 473 int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw, 474 enum avc_general_plug_dir dir, 475 struct snd_oxfw_stream_formation *formation) 476 { 477 u8 *format; 478 unsigned int len; 479 int err; 480 481 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 482 format = kmalloc(len, GFP_KERNEL); 483 if (format == NULL) 484 return -ENOMEM; 485 486 err = avc_stream_get_format_single(oxfw->unit, dir, 0, format, &len); 487 if (err < 0) 488 goto end; 489 if (len < 3) { 490 err = -EIO; 491 goto end; 492 } 493 494 err = snd_oxfw_stream_parse_format(format, formation); 495 end: 496 kfree(format); 497 return err; 498 } 499 500 /* 501 * See Table 6.16 - AM824 Stream Format 502 * Figure 6.19 - format_information field for AM824 Compound 503 * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA) 504 * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005 505 */ 506 int snd_oxfw_stream_parse_format(u8 *format, 507 struct snd_oxfw_stream_formation *formation) 508 { 509 unsigned int i, e, channels, type; 510 511 memset(formation, 0, sizeof(struct snd_oxfw_stream_formation)); 512 513 /* 514 * this module can support a hierarchy combination that: 515 * Root: Audio and Music (0x90) 516 * Level 1: AM824 Compound (0x40) 517 */ 518 if ((format[0] != 0x90) || (format[1] != 0x40)) 519 return -ENXIO; 520 521 /* check the sampling rate */ 522 for (i = 0; i < ARRAY_SIZE(avc_stream_rate_table); i++) { 523 if (format[2] == avc_stream_rate_table[i]) 524 break; 525 } 526 if (i == ARRAY_SIZE(avc_stream_rate_table)) 527 return -ENXIO; 528 529 formation->rate = oxfw_rate_table[i]; 530 531 for (e = 0; e < format[4]; e++) { 532 channels = format[5 + e * 2]; 533 type = format[6 + e * 2]; 534 535 switch (type) { 536 /* IEC 60958 Conformant, currently handled as MBLA */ 537 case 0x00: 538 /* Multi Bit Linear Audio (Raw) */ 539 case 0x06: 540 formation->pcm += channels; 541 break; 542 /* MIDI Conformant */ 543 case 0x0d: 544 formation->midi = channels; 545 break; 546 /* IEC 61937-3 to 7 */ 547 case 0x01: 548 case 0x02: 549 case 0x03: 550 case 0x04: 551 case 0x05: 552 /* Multi Bit Linear Audio */ 553 case 0x07: /* DVD-Audio */ 554 case 0x0c: /* High Precision */ 555 /* One Bit Audio */ 556 case 0x08: /* (Plain) Raw */ 557 case 0x09: /* (Plain) SACD */ 558 case 0x0a: /* (Encoded) Raw */ 559 case 0x0b: /* (Encoded) SACD */ 560 /* SMPTE Time-Code conformant */ 561 case 0x0e: 562 /* Sample Count */ 563 case 0x0f: 564 /* Anciliary Data */ 565 case 0x10: 566 /* Synchronization Stream (Stereo Raw audio) */ 567 case 0x40: 568 /* Don't care */ 569 case 0xff: 570 default: 571 return -ENXIO; /* not supported */ 572 } 573 } 574 575 if (formation->pcm > AM824_MAX_CHANNELS_FOR_PCM || 576 formation->midi > AM824_MAX_CHANNELS_FOR_MIDI) 577 return -ENXIO; 578 579 return 0; 580 } 581 582 static int 583 assume_stream_formats(struct snd_oxfw *oxfw, enum avc_general_plug_dir dir, 584 unsigned int pid, u8 *buf, unsigned int *len, 585 u8 **formats) 586 { 587 struct snd_oxfw_stream_formation formation; 588 unsigned int i, eid; 589 int err; 590 591 /* get format at current sampling rate */ 592 err = avc_stream_get_format_single(oxfw->unit, dir, pid, buf, len); 593 if (err < 0) { 594 dev_err(&oxfw->unit->device, 595 "fail to get current stream format for isoc %s plug %d:%d\n", 596 (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out", 597 pid, err); 598 goto end; 599 } 600 601 /* parse and set stream format */ 602 eid = 0; 603 err = snd_oxfw_stream_parse_format(buf, &formation); 604 if (err < 0) 605 goto end; 606 607 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len, 608 GFP_KERNEL); 609 if (!formats[eid]) { 610 err = -ENOMEM; 611 goto end; 612 } 613 614 /* apply the format for each available sampling rate */ 615 for (i = 0; i < ARRAY_SIZE(oxfw_rate_table); i++) { 616 if (formation.rate == oxfw_rate_table[i]) 617 continue; 618 619 err = avc_general_inquiry_sig_fmt(oxfw->unit, 620 oxfw_rate_table[i], 621 dir, pid); 622 if (err < 0) 623 continue; 624 625 eid++; 626 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len, 627 GFP_KERNEL); 628 if (formats[eid] == NULL) { 629 err = -ENOMEM; 630 goto end; 631 } 632 formats[eid][2] = avc_stream_rate_table[i]; 633 } 634 635 err = 0; 636 oxfw->assumed = true; 637 end: 638 return err; 639 } 640 641 static int fill_stream_formats(struct snd_oxfw *oxfw, 642 enum avc_general_plug_dir dir, 643 unsigned short pid) 644 { 645 u8 *buf, **formats; 646 unsigned int len, eid = 0; 647 struct snd_oxfw_stream_formation dummy; 648 int err; 649 650 buf = kmalloc(AVC_GENERIC_FRAME_MAXIMUM_BYTES, GFP_KERNEL); 651 if (buf == NULL) 652 return -ENOMEM; 653 654 if (dir == AVC_GENERAL_PLUG_DIR_OUT) 655 formats = oxfw->tx_stream_formats; 656 else 657 formats = oxfw->rx_stream_formats; 658 659 /* get first entry */ 660 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 661 err = avc_stream_get_format_list(oxfw->unit, dir, 0, buf, &len, 0); 662 if (err == -ENXIO) { 663 /* LIST subfunction is not implemented */ 664 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 665 err = assume_stream_formats(oxfw, dir, pid, buf, &len, 666 formats); 667 goto end; 668 } else if (err < 0) { 669 dev_err(&oxfw->unit->device, 670 "fail to get stream format %d for isoc %s plug %d:%d\n", 671 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out", 672 pid, err); 673 goto end; 674 } 675 676 /* LIST subfunction is implemented */ 677 while (eid < SND_OXFW_STREAM_FORMAT_ENTRIES) { 678 /* The format is too short. */ 679 if (len < 3) { 680 err = -EIO; 681 break; 682 } 683 684 /* parse and set stream format */ 685 err = snd_oxfw_stream_parse_format(buf, &dummy); 686 if (err < 0) 687 break; 688 689 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, len, 690 GFP_KERNEL); 691 if (!formats[eid]) { 692 err = -ENOMEM; 693 break; 694 } 695 696 /* get next entry */ 697 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 698 err = avc_stream_get_format_list(oxfw->unit, dir, 0, 699 buf, &len, ++eid); 700 /* No entries remained. */ 701 if (err == -EINVAL) { 702 err = 0; 703 break; 704 } else if (err < 0) { 705 dev_err(&oxfw->unit->device, 706 "fail to get stream format %d for isoc %s plug %d:%d\n", 707 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : 708 "out", 709 pid, err); 710 break; 711 } 712 } 713 end: 714 kfree(buf); 715 return err; 716 } 717 718 int snd_oxfw_stream_discover(struct snd_oxfw *oxfw) 719 { 720 u8 plugs[AVC_PLUG_INFO_BUF_BYTES]; 721 struct snd_oxfw_stream_formation formation; 722 u8 *format; 723 unsigned int i; 724 int err; 725 726 /* the number of plugs for isoc in/out, ext in/out */ 727 err = avc_general_get_plug_info(oxfw->unit, 0x1f, 0x07, 0x00, plugs); 728 if (err < 0) { 729 dev_err(&oxfw->unit->device, 730 "fail to get info for isoc/external in/out plugs: %d\n", 731 err); 732 goto end; 733 } else if ((plugs[0] == 0) && (plugs[1] == 0)) { 734 err = -ENXIO; 735 goto end; 736 } 737 738 /* use oPCR[0] if exists */ 739 if (plugs[1] > 0) { 740 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_OUT, 0); 741 if (err < 0) { 742 if (err != -ENXIO) 743 return err; 744 745 // The oPCR is not available for isoc communication. 746 err = 0; 747 } else { 748 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 749 format = oxfw->tx_stream_formats[i]; 750 if (format == NULL) 751 continue; 752 err = snd_oxfw_stream_parse_format(format, 753 &formation); 754 if (err < 0) 755 continue; 756 757 /* Add one MIDI port. */ 758 if (formation.midi > 0) 759 oxfw->midi_input_ports = 1; 760 } 761 762 oxfw->has_output = true; 763 } 764 } 765 766 /* use iPCR[0] if exists */ 767 if (plugs[0] > 0) { 768 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_IN, 0); 769 if (err < 0) { 770 if (err != -ENXIO) 771 return err; 772 773 // The iPCR is not available for isoc communication. 774 err = 0; 775 } else { 776 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 777 format = oxfw->rx_stream_formats[i]; 778 if (format == NULL) 779 continue; 780 err = snd_oxfw_stream_parse_format(format, 781 &formation); 782 if (err < 0) 783 continue; 784 785 /* Add one MIDI port. */ 786 if (formation.midi > 0) 787 oxfw->midi_output_ports = 1; 788 } 789 790 oxfw->has_input = true; 791 } 792 } 793 end: 794 return err; 795 } 796 797 void snd_oxfw_stream_lock_changed(struct snd_oxfw *oxfw) 798 { 799 oxfw->dev_lock_changed = true; 800 wake_up(&oxfw->hwdep_wait); 801 } 802 803 int snd_oxfw_stream_lock_try(struct snd_oxfw *oxfw) 804 { 805 int err; 806 807 spin_lock_irq(&oxfw->lock); 808 809 /* user land lock this */ 810 if (oxfw->dev_lock_count < 0) { 811 err = -EBUSY; 812 goto end; 813 } 814 815 /* this is the first time */ 816 if (oxfw->dev_lock_count++ == 0) 817 snd_oxfw_stream_lock_changed(oxfw); 818 err = 0; 819 end: 820 spin_unlock_irq(&oxfw->lock); 821 return err; 822 } 823 824 void snd_oxfw_stream_lock_release(struct snd_oxfw *oxfw) 825 { 826 spin_lock_irq(&oxfw->lock); 827 828 if (WARN_ON(oxfw->dev_lock_count <= 0)) 829 goto end; 830 if (--oxfw->dev_lock_count == 0) 831 snd_oxfw_stream_lock_changed(oxfw); 832 end: 833 spin_unlock_irq(&oxfw->lock); 834 } 835