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 CALLBACK_TIMEOUT 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 int err; 157 158 if (stream == &oxfw->tx_stream) { 159 conn = &oxfw->out_conn; 160 c_dir = CMP_OUTPUT; 161 s_dir = AMDTP_IN_STREAM; 162 } else { 163 conn = &oxfw->in_conn; 164 c_dir = CMP_INPUT; 165 s_dir = AMDTP_OUT_STREAM; 166 } 167 168 err = cmp_connection_init(conn, oxfw->unit, c_dir, 0); 169 if (err < 0) 170 return err; 171 172 err = amdtp_am824_init(stream, oxfw->unit, s_dir, CIP_NONBLOCKING); 173 if (err < 0) { 174 cmp_connection_destroy(conn); 175 return err; 176 } 177 178 /* 179 * OXFW starts to transmit packets with non-zero dbc. 180 * OXFW postpone transferring packets till handling any asynchronous 181 * packets. As a result, next isochronous packet includes more data 182 * blocks than IEC 61883-6 defines. 183 */ 184 if (stream == &oxfw->tx_stream) { 185 oxfw->tx_stream.flags |= CIP_JUMBO_PAYLOAD; 186 if (oxfw->wrong_dbs) 187 oxfw->tx_stream.flags |= CIP_WRONG_DBS; 188 } 189 190 return 0; 191 } 192 193 static int keep_resources(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 194 { 195 enum avc_general_plug_dir dir; 196 u8 **formats; 197 struct snd_oxfw_stream_formation formation; 198 struct cmp_connection *conn; 199 int i; 200 int err; 201 202 if (stream == &oxfw->rx_stream) { 203 dir = AVC_GENERAL_PLUG_DIR_IN; 204 formats = oxfw->rx_stream_formats; 205 conn = &oxfw->in_conn; 206 } else { 207 dir = AVC_GENERAL_PLUG_DIR_OUT; 208 formats = oxfw->tx_stream_formats; 209 conn = &oxfw->out_conn; 210 } 211 212 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation); 213 if (err < 0) 214 return err; 215 216 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 217 struct snd_oxfw_stream_formation fmt; 218 219 if (formats[i] == NULL) 220 break; 221 222 err = snd_oxfw_stream_parse_format(formats[i], &fmt); 223 if (err < 0) 224 return err; 225 226 if (fmt.rate == formation.rate && fmt.pcm == formation.pcm && 227 fmt.midi == formation.midi) 228 break; 229 } 230 if (i == SND_OXFW_STREAM_FORMAT_ENTRIES) 231 return -EINVAL; 232 233 // The stream should have one pcm channels at least. 234 if (formation.pcm == 0) 235 return -EINVAL; 236 237 err = amdtp_am824_set_parameters(stream, formation.rate, formation.pcm, 238 formation.midi * 8, false); 239 if (err < 0) 240 return err; 241 242 return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream)); 243 } 244 245 int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw, 246 struct amdtp_stream *stream, 247 unsigned int rate, unsigned int pcm_channels, 248 unsigned int frames_per_period, 249 unsigned int frames_per_buffer) 250 { 251 struct snd_oxfw_stream_formation formation; 252 enum avc_general_plug_dir dir; 253 int err; 254 255 // Considering JACK/FFADO streaming: 256 // TODO: This can be removed hwdep functionality becomes popular. 257 err = check_connection_used_by_others(oxfw, &oxfw->rx_stream); 258 if (err < 0) 259 return err; 260 if (oxfw->has_output) { 261 err = check_connection_used_by_others(oxfw, &oxfw->tx_stream); 262 if (err < 0) 263 return err; 264 } 265 266 if (stream == &oxfw->tx_stream) 267 dir = AVC_GENERAL_PLUG_DIR_OUT; 268 else 269 dir = AVC_GENERAL_PLUG_DIR_IN; 270 271 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation); 272 if (err < 0) 273 return err; 274 if (rate == 0) { 275 rate = formation.rate; 276 pcm_channels = formation.pcm; 277 } 278 if (formation.rate != rate || formation.pcm != pcm_channels) { 279 amdtp_domain_stop(&oxfw->domain); 280 281 cmp_connection_break(&oxfw->in_conn); 282 cmp_connection_release(&oxfw->in_conn); 283 284 if (oxfw->has_output) { 285 cmp_connection_break(&oxfw->out_conn); 286 cmp_connection_release(&oxfw->out_conn); 287 } 288 } 289 290 if (oxfw->substreams_count == 0 || 291 formation.rate != rate || formation.pcm != pcm_channels) { 292 err = set_stream_format(oxfw, stream, rate, pcm_channels); 293 if (err < 0) { 294 dev_err(&oxfw->unit->device, 295 "fail to set stream format: %d\n", err); 296 return err; 297 } 298 299 err = keep_resources(oxfw, &oxfw->rx_stream); 300 if (err < 0) 301 return err; 302 303 if (oxfw->has_output) { 304 err = keep_resources(oxfw, &oxfw->tx_stream); 305 if (err < 0) { 306 cmp_connection_release(&oxfw->in_conn); 307 return err; 308 } 309 } 310 311 err = amdtp_domain_set_events_per_period(&oxfw->domain, 312 frames_per_period, frames_per_buffer); 313 if (err < 0) { 314 cmp_connection_release(&oxfw->in_conn); 315 if (oxfw->has_output) 316 cmp_connection_release(&oxfw->out_conn); 317 return err; 318 } 319 } 320 321 return 0; 322 } 323 324 int snd_oxfw_stream_start_duplex(struct snd_oxfw *oxfw) 325 { 326 int err; 327 328 if (oxfw->substreams_count == 0) 329 return -EIO; 330 331 if (amdtp_streaming_error(&oxfw->rx_stream) || 332 amdtp_streaming_error(&oxfw->tx_stream)) { 333 amdtp_domain_stop(&oxfw->domain); 334 335 cmp_connection_break(&oxfw->in_conn); 336 if (oxfw->has_output) 337 cmp_connection_break(&oxfw->out_conn); 338 } 339 340 if (!amdtp_stream_running(&oxfw->rx_stream)) { 341 err = start_stream(oxfw, &oxfw->rx_stream); 342 if (err < 0) { 343 dev_err(&oxfw->unit->device, 344 "fail to prepare rx stream: %d\n", err); 345 goto error; 346 } 347 348 if (oxfw->has_output && 349 !amdtp_stream_running(&oxfw->tx_stream)) { 350 err = start_stream(oxfw, &oxfw->tx_stream); 351 if (err < 0) { 352 dev_err(&oxfw->unit->device, 353 "fail to prepare tx stream: %d\n", err); 354 goto error; 355 } 356 } 357 358 err = amdtp_domain_start(&oxfw->domain, 0); 359 if (err < 0) 360 goto error; 361 362 // Wait first packet. 363 if (!amdtp_stream_wait_callback(&oxfw->rx_stream, 364 CALLBACK_TIMEOUT)) { 365 err = -ETIMEDOUT; 366 goto error; 367 } 368 369 if (oxfw->has_output) { 370 if (!amdtp_stream_wait_callback(&oxfw->tx_stream, 371 CALLBACK_TIMEOUT)) { 372 err = -ETIMEDOUT; 373 goto error; 374 } 375 } 376 } 377 378 return 0; 379 error: 380 amdtp_domain_stop(&oxfw->domain); 381 382 cmp_connection_break(&oxfw->in_conn); 383 if (oxfw->has_output) 384 cmp_connection_break(&oxfw->out_conn); 385 386 return err; 387 } 388 389 void snd_oxfw_stream_stop_duplex(struct snd_oxfw *oxfw) 390 { 391 if (oxfw->substreams_count == 0) { 392 amdtp_domain_stop(&oxfw->domain); 393 394 cmp_connection_break(&oxfw->in_conn); 395 cmp_connection_release(&oxfw->in_conn); 396 397 if (oxfw->has_output) { 398 cmp_connection_break(&oxfw->out_conn); 399 cmp_connection_release(&oxfw->out_conn); 400 } 401 } 402 } 403 404 static void destroy_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 405 { 406 struct cmp_connection *conn; 407 408 if (stream == &oxfw->tx_stream) 409 conn = &oxfw->out_conn; 410 else 411 conn = &oxfw->in_conn; 412 413 amdtp_stream_destroy(stream); 414 cmp_connection_destroy(conn); 415 } 416 417 int snd_oxfw_stream_init_duplex(struct snd_oxfw *oxfw) 418 { 419 int err; 420 421 err = init_stream(oxfw, &oxfw->rx_stream); 422 if (err < 0) 423 return err; 424 425 if (oxfw->has_output) { 426 err = init_stream(oxfw, &oxfw->tx_stream); 427 if (err < 0) { 428 destroy_stream(oxfw, &oxfw->rx_stream); 429 return err; 430 } 431 } 432 433 err = amdtp_domain_init(&oxfw->domain); 434 if (err < 0) { 435 destroy_stream(oxfw, &oxfw->rx_stream); 436 if (oxfw->has_output) 437 destroy_stream(oxfw, &oxfw->tx_stream); 438 } 439 440 return err; 441 } 442 443 // This function should be called before starting the stream or after stopping 444 // the streams. 445 void snd_oxfw_stream_destroy_duplex(struct snd_oxfw *oxfw) 446 { 447 amdtp_domain_destroy(&oxfw->domain); 448 449 destroy_stream(oxfw, &oxfw->rx_stream); 450 451 if (oxfw->has_output) 452 destroy_stream(oxfw, &oxfw->tx_stream); 453 } 454 455 void snd_oxfw_stream_update_duplex(struct snd_oxfw *oxfw) 456 { 457 amdtp_domain_stop(&oxfw->domain); 458 459 cmp_connection_break(&oxfw->in_conn); 460 461 amdtp_stream_pcm_abort(&oxfw->rx_stream); 462 463 if (oxfw->has_output) { 464 cmp_connection_break(&oxfw->out_conn); 465 466 amdtp_stream_pcm_abort(&oxfw->tx_stream); 467 } 468 } 469 470 int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw, 471 enum avc_general_plug_dir dir, 472 struct snd_oxfw_stream_formation *formation) 473 { 474 u8 *format; 475 unsigned int len; 476 int err; 477 478 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 479 format = kmalloc(len, GFP_KERNEL); 480 if (format == NULL) 481 return -ENOMEM; 482 483 err = avc_stream_get_format_single(oxfw->unit, dir, 0, format, &len); 484 if (err < 0) 485 goto end; 486 if (len < 3) { 487 err = -EIO; 488 goto end; 489 } 490 491 err = snd_oxfw_stream_parse_format(format, formation); 492 end: 493 kfree(format); 494 return err; 495 } 496 497 /* 498 * See Table 6.16 - AM824 Stream Format 499 * Figure 6.19 - format_information field for AM824 Compound 500 * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA) 501 * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005 502 */ 503 int snd_oxfw_stream_parse_format(u8 *format, 504 struct snd_oxfw_stream_formation *formation) 505 { 506 unsigned int i, e, channels, type; 507 508 memset(formation, 0, sizeof(struct snd_oxfw_stream_formation)); 509 510 /* 511 * this module can support a hierarchy combination that: 512 * Root: Audio and Music (0x90) 513 * Level 1: AM824 Compound (0x40) 514 */ 515 if ((format[0] != 0x90) || (format[1] != 0x40)) 516 return -ENXIO; 517 518 /* check the sampling rate */ 519 for (i = 0; i < ARRAY_SIZE(avc_stream_rate_table); i++) { 520 if (format[2] == avc_stream_rate_table[i]) 521 break; 522 } 523 if (i == ARRAY_SIZE(avc_stream_rate_table)) 524 return -ENXIO; 525 526 formation->rate = oxfw_rate_table[i]; 527 528 for (e = 0; e < format[4]; e++) { 529 channels = format[5 + e * 2]; 530 type = format[6 + e * 2]; 531 532 switch (type) { 533 /* IEC 60958 Conformant, currently handled as MBLA */ 534 case 0x00: 535 /* Multi Bit Linear Audio (Raw) */ 536 case 0x06: 537 formation->pcm += channels; 538 break; 539 /* MIDI Conformant */ 540 case 0x0d: 541 formation->midi = channels; 542 break; 543 /* IEC 61937-3 to 7 */ 544 case 0x01: 545 case 0x02: 546 case 0x03: 547 case 0x04: 548 case 0x05: 549 /* Multi Bit Linear Audio */ 550 case 0x07: /* DVD-Audio */ 551 case 0x0c: /* High Precision */ 552 /* One Bit Audio */ 553 case 0x08: /* (Plain) Raw */ 554 case 0x09: /* (Plain) SACD */ 555 case 0x0a: /* (Encoded) Raw */ 556 case 0x0b: /* (Encoded) SACD */ 557 /* SMPTE Time-Code conformant */ 558 case 0x0e: 559 /* Sample Count */ 560 case 0x0f: 561 /* Anciliary Data */ 562 case 0x10: 563 /* Synchronization Stream (Stereo Raw audio) */ 564 case 0x40: 565 /* Don't care */ 566 case 0xff: 567 default: 568 return -ENXIO; /* not supported */ 569 } 570 } 571 572 if (formation->pcm > AM824_MAX_CHANNELS_FOR_PCM || 573 formation->midi > AM824_MAX_CHANNELS_FOR_MIDI) 574 return -ENXIO; 575 576 return 0; 577 } 578 579 static int 580 assume_stream_formats(struct snd_oxfw *oxfw, enum avc_general_plug_dir dir, 581 unsigned int pid, u8 *buf, unsigned int *len, 582 u8 **formats) 583 { 584 struct snd_oxfw_stream_formation formation; 585 unsigned int i, eid; 586 int err; 587 588 /* get format at current sampling rate */ 589 err = avc_stream_get_format_single(oxfw->unit, dir, pid, buf, len); 590 if (err < 0) { 591 dev_err(&oxfw->unit->device, 592 "fail to get current stream format for isoc %s plug %d:%d\n", 593 (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out", 594 pid, err); 595 goto end; 596 } 597 598 /* parse and set stream format */ 599 eid = 0; 600 err = snd_oxfw_stream_parse_format(buf, &formation); 601 if (err < 0) 602 goto end; 603 604 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len, 605 GFP_KERNEL); 606 if (!formats[eid]) { 607 err = -ENOMEM; 608 goto end; 609 } 610 611 /* apply the format for each available sampling rate */ 612 for (i = 0; i < ARRAY_SIZE(oxfw_rate_table); i++) { 613 if (formation.rate == oxfw_rate_table[i]) 614 continue; 615 616 err = avc_general_inquiry_sig_fmt(oxfw->unit, 617 oxfw_rate_table[i], 618 dir, pid); 619 if (err < 0) 620 continue; 621 622 eid++; 623 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len, 624 GFP_KERNEL); 625 if (formats[eid] == NULL) { 626 err = -ENOMEM; 627 goto end; 628 } 629 formats[eid][2] = avc_stream_rate_table[i]; 630 } 631 632 err = 0; 633 oxfw->assumed = true; 634 end: 635 return err; 636 } 637 638 static int fill_stream_formats(struct snd_oxfw *oxfw, 639 enum avc_general_plug_dir dir, 640 unsigned short pid) 641 { 642 u8 *buf, **formats; 643 unsigned int len, eid = 0; 644 struct snd_oxfw_stream_formation dummy; 645 int err; 646 647 buf = kmalloc(AVC_GENERIC_FRAME_MAXIMUM_BYTES, GFP_KERNEL); 648 if (buf == NULL) 649 return -ENOMEM; 650 651 if (dir == AVC_GENERAL_PLUG_DIR_OUT) 652 formats = oxfw->tx_stream_formats; 653 else 654 formats = oxfw->rx_stream_formats; 655 656 /* get first entry */ 657 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 658 err = avc_stream_get_format_list(oxfw->unit, dir, 0, buf, &len, 0); 659 if (err == -ENXIO) { 660 /* LIST subfunction is not implemented */ 661 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 662 err = assume_stream_formats(oxfw, dir, pid, buf, &len, 663 formats); 664 goto end; 665 } else if (err < 0) { 666 dev_err(&oxfw->unit->device, 667 "fail to get stream format %d for isoc %s plug %d:%d\n", 668 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out", 669 pid, err); 670 goto end; 671 } 672 673 /* LIST subfunction is implemented */ 674 while (eid < SND_OXFW_STREAM_FORMAT_ENTRIES) { 675 /* The format is too short. */ 676 if (len < 3) { 677 err = -EIO; 678 break; 679 } 680 681 /* parse and set stream format */ 682 err = snd_oxfw_stream_parse_format(buf, &dummy); 683 if (err < 0) 684 break; 685 686 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, len, 687 GFP_KERNEL); 688 if (!formats[eid]) { 689 err = -ENOMEM; 690 break; 691 } 692 693 /* get next entry */ 694 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 695 err = avc_stream_get_format_list(oxfw->unit, dir, 0, 696 buf, &len, ++eid); 697 /* No entries remained. */ 698 if (err == -EINVAL) { 699 err = 0; 700 break; 701 } else if (err < 0) { 702 dev_err(&oxfw->unit->device, 703 "fail to get stream format %d for isoc %s plug %d:%d\n", 704 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : 705 "out", 706 pid, err); 707 break; 708 } 709 } 710 end: 711 kfree(buf); 712 return err; 713 } 714 715 int snd_oxfw_stream_discover(struct snd_oxfw *oxfw) 716 { 717 u8 plugs[AVC_PLUG_INFO_BUF_BYTES]; 718 struct snd_oxfw_stream_formation formation; 719 u8 *format; 720 unsigned int i; 721 int err; 722 723 /* the number of plugs for isoc in/out, ext in/out */ 724 err = avc_general_get_plug_info(oxfw->unit, 0x1f, 0x07, 0x00, plugs); 725 if (err < 0) { 726 dev_err(&oxfw->unit->device, 727 "fail to get info for isoc/external in/out plugs: %d\n", 728 err); 729 goto end; 730 } else if ((plugs[0] == 0) && (plugs[1] == 0)) { 731 err = -ENXIO; 732 goto end; 733 } 734 735 /* use oPCR[0] if exists */ 736 if (plugs[1] > 0) { 737 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_OUT, 0); 738 if (err < 0) { 739 if (err != -ENXIO) 740 return err; 741 742 // The oPCR is not available for isoc communication. 743 err = 0; 744 } else { 745 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 746 format = oxfw->tx_stream_formats[i]; 747 if (format == NULL) 748 continue; 749 err = snd_oxfw_stream_parse_format(format, 750 &formation); 751 if (err < 0) 752 continue; 753 754 /* Add one MIDI port. */ 755 if (formation.midi > 0) 756 oxfw->midi_input_ports = 1; 757 } 758 759 oxfw->has_output = true; 760 } 761 } 762 763 /* use iPCR[0] if exists */ 764 if (plugs[0] > 0) { 765 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_IN, 0); 766 if (err < 0) { 767 if (err != -ENXIO) 768 return err; 769 770 // The iPCR is not available for isoc communication. 771 err = 0; 772 } else { 773 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 774 format = oxfw->rx_stream_formats[i]; 775 if (format == NULL) 776 continue; 777 err = snd_oxfw_stream_parse_format(format, 778 &formation); 779 if (err < 0) 780 continue; 781 782 /* Add one MIDI port. */ 783 if (formation.midi > 0) 784 oxfw->midi_output_ports = 1; 785 } 786 787 oxfw->has_input = true; 788 } 789 } 790 end: 791 return err; 792 } 793 794 void snd_oxfw_stream_lock_changed(struct snd_oxfw *oxfw) 795 { 796 oxfw->dev_lock_changed = true; 797 wake_up(&oxfw->hwdep_wait); 798 } 799 800 int snd_oxfw_stream_lock_try(struct snd_oxfw *oxfw) 801 { 802 int err; 803 804 spin_lock_irq(&oxfw->lock); 805 806 /* user land lock this */ 807 if (oxfw->dev_lock_count < 0) { 808 err = -EBUSY; 809 goto end; 810 } 811 812 /* this is the first time */ 813 if (oxfw->dev_lock_count++ == 0) 814 snd_oxfw_stream_lock_changed(oxfw); 815 err = 0; 816 end: 817 spin_unlock_irq(&oxfw->lock); 818 return err; 819 } 820 821 void snd_oxfw_stream_lock_release(struct snd_oxfw *oxfw) 822 { 823 spin_lock_irq(&oxfw->lock); 824 825 if (WARN_ON(oxfw->dev_lock_count <= 0)) 826 goto end; 827 if (--oxfw->dev_lock_count == 0) 828 snd_oxfw_stream_lock_changed(oxfw); 829 end: 830 spin_unlock_irq(&oxfw->lock); 831 } 832