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 unsigned int flags; 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 err = start_stream(oxfw, &oxfw->rx_stream); 341 if (err < 0) { 342 dev_err(&oxfw->unit->device, 343 "fail to prepare rx stream: %d\n", err); 344 goto error; 345 } 346 347 if (oxfw->has_output && 348 !amdtp_stream_running(&oxfw->tx_stream)) { 349 err = start_stream(oxfw, &oxfw->tx_stream); 350 if (err < 0) { 351 dev_err(&oxfw->unit->device, 352 "fail to prepare tx stream: %d\n", err); 353 goto error; 354 } 355 } 356 357 err = amdtp_domain_start(&oxfw->domain, 0); 358 if (err < 0) 359 goto error; 360 361 // Wait first packet. 362 if (!amdtp_stream_wait_callback(&oxfw->rx_stream, 363 CALLBACK_TIMEOUT)) { 364 err = -ETIMEDOUT; 365 goto error; 366 } 367 368 if (oxfw->has_output) { 369 if (!amdtp_stream_wait_callback(&oxfw->tx_stream, 370 CALLBACK_TIMEOUT)) { 371 err = -ETIMEDOUT; 372 goto error; 373 } 374 } 375 } 376 377 return 0; 378 error: 379 amdtp_domain_stop(&oxfw->domain); 380 381 cmp_connection_break(&oxfw->in_conn); 382 if (oxfw->has_output) 383 cmp_connection_break(&oxfw->out_conn); 384 385 return err; 386 } 387 388 void snd_oxfw_stream_stop_duplex(struct snd_oxfw *oxfw) 389 { 390 if (oxfw->substreams_count == 0) { 391 amdtp_domain_stop(&oxfw->domain); 392 393 cmp_connection_break(&oxfw->in_conn); 394 cmp_connection_release(&oxfw->in_conn); 395 396 if (oxfw->has_output) { 397 cmp_connection_break(&oxfw->out_conn); 398 cmp_connection_release(&oxfw->out_conn); 399 } 400 } 401 } 402 403 static void destroy_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 404 { 405 struct cmp_connection *conn; 406 407 if (stream == &oxfw->tx_stream) 408 conn = &oxfw->out_conn; 409 else 410 conn = &oxfw->in_conn; 411 412 amdtp_stream_destroy(stream); 413 cmp_connection_destroy(conn); 414 } 415 416 int snd_oxfw_stream_init_duplex(struct snd_oxfw *oxfw) 417 { 418 int err; 419 420 err = init_stream(oxfw, &oxfw->rx_stream); 421 if (err < 0) 422 return err; 423 424 if (oxfw->has_output) { 425 err = init_stream(oxfw, &oxfw->tx_stream); 426 if (err < 0) { 427 destroy_stream(oxfw, &oxfw->rx_stream); 428 return err; 429 } 430 } 431 432 err = amdtp_domain_init(&oxfw->domain); 433 if (err < 0) { 434 destroy_stream(oxfw, &oxfw->rx_stream); 435 if (oxfw->has_output) 436 destroy_stream(oxfw, &oxfw->tx_stream); 437 } 438 439 return err; 440 } 441 442 // This function should be called before starting the stream or after stopping 443 // the streams. 444 void snd_oxfw_stream_destroy_duplex(struct snd_oxfw *oxfw) 445 { 446 amdtp_domain_destroy(&oxfw->domain); 447 448 destroy_stream(oxfw, &oxfw->rx_stream); 449 450 if (oxfw->has_output) 451 destroy_stream(oxfw, &oxfw->tx_stream); 452 } 453 454 void snd_oxfw_stream_update_duplex(struct snd_oxfw *oxfw) 455 { 456 amdtp_domain_stop(&oxfw->domain); 457 458 cmp_connection_break(&oxfw->in_conn); 459 460 amdtp_stream_pcm_abort(&oxfw->rx_stream); 461 462 if (oxfw->has_output) { 463 cmp_connection_break(&oxfw->out_conn); 464 465 amdtp_stream_pcm_abort(&oxfw->tx_stream); 466 } 467 } 468 469 int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw, 470 enum avc_general_plug_dir dir, 471 struct snd_oxfw_stream_formation *formation) 472 { 473 u8 *format; 474 unsigned int len; 475 int err; 476 477 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 478 format = kmalloc(len, GFP_KERNEL); 479 if (format == NULL) 480 return -ENOMEM; 481 482 err = avc_stream_get_format_single(oxfw->unit, dir, 0, format, &len); 483 if (err < 0) 484 goto end; 485 if (len < 3) { 486 err = -EIO; 487 goto end; 488 } 489 490 err = snd_oxfw_stream_parse_format(format, formation); 491 end: 492 kfree(format); 493 return err; 494 } 495 496 /* 497 * See Table 6.16 - AM824 Stream Format 498 * Figure 6.19 - format_information field for AM824 Compound 499 * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA) 500 * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005 501 */ 502 int snd_oxfw_stream_parse_format(u8 *format, 503 struct snd_oxfw_stream_formation *formation) 504 { 505 unsigned int i, e, channels, type; 506 507 memset(formation, 0, sizeof(struct snd_oxfw_stream_formation)); 508 509 /* 510 * this module can support a hierarchy combination that: 511 * Root: Audio and Music (0x90) 512 * Level 1: AM824 Compound (0x40) 513 */ 514 if ((format[0] != 0x90) || (format[1] != 0x40)) 515 return -ENXIO; 516 517 /* check the sampling rate */ 518 for (i = 0; i < ARRAY_SIZE(avc_stream_rate_table); i++) { 519 if (format[2] == avc_stream_rate_table[i]) 520 break; 521 } 522 if (i == ARRAY_SIZE(avc_stream_rate_table)) 523 return -ENXIO; 524 525 formation->rate = oxfw_rate_table[i]; 526 527 for (e = 0; e < format[4]; e++) { 528 channels = format[5 + e * 2]; 529 type = format[6 + e * 2]; 530 531 switch (type) { 532 /* IEC 60958 Conformant, currently handled as MBLA */ 533 case 0x00: 534 /* Multi Bit Linear Audio (Raw) */ 535 case 0x06: 536 formation->pcm += channels; 537 break; 538 /* MIDI Conformant */ 539 case 0x0d: 540 formation->midi = channels; 541 break; 542 /* IEC 61937-3 to 7 */ 543 case 0x01: 544 case 0x02: 545 case 0x03: 546 case 0x04: 547 case 0x05: 548 /* Multi Bit Linear Audio */ 549 case 0x07: /* DVD-Audio */ 550 case 0x0c: /* High Precision */ 551 /* One Bit Audio */ 552 case 0x08: /* (Plain) Raw */ 553 case 0x09: /* (Plain) SACD */ 554 case 0x0a: /* (Encoded) Raw */ 555 case 0x0b: /* (Encoded) SACD */ 556 /* SMPTE Time-Code conformant */ 557 case 0x0e: 558 /* Sample Count */ 559 case 0x0f: 560 /* Anciliary Data */ 561 case 0x10: 562 /* Synchronization Stream (Stereo Raw audio) */ 563 case 0x40: 564 /* Don't care */ 565 case 0xff: 566 default: 567 return -ENXIO; /* not supported */ 568 } 569 } 570 571 if (formation->pcm > AM824_MAX_CHANNELS_FOR_PCM || 572 formation->midi > AM824_MAX_CHANNELS_FOR_MIDI) 573 return -ENXIO; 574 575 return 0; 576 } 577 578 static int 579 assume_stream_formats(struct snd_oxfw *oxfw, enum avc_general_plug_dir dir, 580 unsigned int pid, u8 *buf, unsigned int *len, 581 u8 **formats) 582 { 583 struct snd_oxfw_stream_formation formation; 584 unsigned int i, eid; 585 int err; 586 587 /* get format at current sampling rate */ 588 err = avc_stream_get_format_single(oxfw->unit, dir, pid, buf, len); 589 if (err < 0) { 590 dev_err(&oxfw->unit->device, 591 "fail to get current stream format for isoc %s plug %d:%d\n", 592 (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out", 593 pid, err); 594 goto end; 595 } 596 597 /* parse and set stream format */ 598 eid = 0; 599 err = snd_oxfw_stream_parse_format(buf, &formation); 600 if (err < 0) 601 goto end; 602 603 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len, 604 GFP_KERNEL); 605 if (!formats[eid]) { 606 err = -ENOMEM; 607 goto end; 608 } 609 610 /* apply the format for each available sampling rate */ 611 for (i = 0; i < ARRAY_SIZE(oxfw_rate_table); i++) { 612 if (formation.rate == oxfw_rate_table[i]) 613 continue; 614 615 err = avc_general_inquiry_sig_fmt(oxfw->unit, 616 oxfw_rate_table[i], 617 dir, pid); 618 if (err < 0) 619 continue; 620 621 eid++; 622 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len, 623 GFP_KERNEL); 624 if (formats[eid] == NULL) { 625 err = -ENOMEM; 626 goto end; 627 } 628 formats[eid][2] = avc_stream_rate_table[i]; 629 } 630 631 err = 0; 632 oxfw->assumed = true; 633 end: 634 return err; 635 } 636 637 static int fill_stream_formats(struct snd_oxfw *oxfw, 638 enum avc_general_plug_dir dir, 639 unsigned short pid) 640 { 641 u8 *buf, **formats; 642 unsigned int len, eid = 0; 643 struct snd_oxfw_stream_formation dummy; 644 int err; 645 646 buf = kmalloc(AVC_GENERIC_FRAME_MAXIMUM_BYTES, GFP_KERNEL); 647 if (buf == NULL) 648 return -ENOMEM; 649 650 if (dir == AVC_GENERAL_PLUG_DIR_OUT) 651 formats = oxfw->tx_stream_formats; 652 else 653 formats = oxfw->rx_stream_formats; 654 655 /* get first entry */ 656 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 657 err = avc_stream_get_format_list(oxfw->unit, dir, 0, buf, &len, 0); 658 if (err == -ENXIO) { 659 /* LIST subfunction is not implemented */ 660 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 661 err = assume_stream_formats(oxfw, dir, pid, buf, &len, 662 formats); 663 goto end; 664 } else if (err < 0) { 665 dev_err(&oxfw->unit->device, 666 "fail to get stream format %d for isoc %s plug %d:%d\n", 667 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out", 668 pid, err); 669 goto end; 670 } 671 672 /* LIST subfunction is implemented */ 673 while (eid < SND_OXFW_STREAM_FORMAT_ENTRIES) { 674 /* The format is too short. */ 675 if (len < 3) { 676 err = -EIO; 677 break; 678 } 679 680 /* parse and set stream format */ 681 err = snd_oxfw_stream_parse_format(buf, &dummy); 682 if (err < 0) 683 break; 684 685 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, len, 686 GFP_KERNEL); 687 if (!formats[eid]) { 688 err = -ENOMEM; 689 break; 690 } 691 692 /* get next entry */ 693 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 694 err = avc_stream_get_format_list(oxfw->unit, dir, 0, 695 buf, &len, ++eid); 696 /* No entries remained. */ 697 if (err == -EINVAL) { 698 err = 0; 699 break; 700 } else if (err < 0) { 701 dev_err(&oxfw->unit->device, 702 "fail to get stream format %d for isoc %s plug %d:%d\n", 703 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : 704 "out", 705 pid, err); 706 break; 707 } 708 } 709 end: 710 kfree(buf); 711 return err; 712 } 713 714 int snd_oxfw_stream_discover(struct snd_oxfw *oxfw) 715 { 716 u8 plugs[AVC_PLUG_INFO_BUF_BYTES]; 717 struct snd_oxfw_stream_formation formation; 718 u8 *format; 719 unsigned int i; 720 int err; 721 722 /* the number of plugs for isoc in/out, ext in/out */ 723 err = avc_general_get_plug_info(oxfw->unit, 0x1f, 0x07, 0x00, plugs); 724 if (err < 0) { 725 dev_err(&oxfw->unit->device, 726 "fail to get info for isoc/external in/out plugs: %d\n", 727 err); 728 goto end; 729 } else if ((plugs[0] == 0) && (plugs[1] == 0)) { 730 err = -ENXIO; 731 goto end; 732 } 733 734 /* use oPCR[0] if exists */ 735 if (plugs[1] > 0) { 736 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_OUT, 0); 737 if (err < 0) { 738 if (err != -ENXIO) 739 return err; 740 741 // The oPCR is not available for isoc communication. 742 err = 0; 743 } else { 744 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 745 format = oxfw->tx_stream_formats[i]; 746 if (format == NULL) 747 continue; 748 err = snd_oxfw_stream_parse_format(format, 749 &formation); 750 if (err < 0) 751 continue; 752 753 /* Add one MIDI port. */ 754 if (formation.midi > 0) 755 oxfw->midi_input_ports = 1; 756 } 757 758 oxfw->has_output = true; 759 } 760 } 761 762 /* use iPCR[0] if exists */ 763 if (plugs[0] > 0) { 764 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_IN, 0); 765 if (err < 0) { 766 if (err != -ENXIO) 767 return err; 768 769 // The iPCR is not available for isoc communication. 770 err = 0; 771 } else { 772 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 773 format = oxfw->rx_stream_formats[i]; 774 if (format == NULL) 775 continue; 776 err = snd_oxfw_stream_parse_format(format, 777 &formation); 778 if (err < 0) 779 continue; 780 781 /* Add one MIDI port. */ 782 if (formation.midi > 0) 783 oxfw->midi_output_ports = 1; 784 } 785 786 oxfw->has_input = true; 787 } 788 } 789 end: 790 return err; 791 } 792 793 void snd_oxfw_stream_lock_changed(struct snd_oxfw *oxfw) 794 { 795 oxfw->dev_lock_changed = true; 796 wake_up(&oxfw->hwdep_wait); 797 } 798 799 int snd_oxfw_stream_lock_try(struct snd_oxfw *oxfw) 800 { 801 int err; 802 803 spin_lock_irq(&oxfw->lock); 804 805 /* user land lock this */ 806 if (oxfw->dev_lock_count < 0) { 807 err = -EBUSY; 808 goto end; 809 } 810 811 /* this is the first time */ 812 if (oxfw->dev_lock_count++ == 0) 813 snd_oxfw_stream_lock_changed(oxfw); 814 err = 0; 815 end: 816 spin_unlock_irq(&oxfw->lock); 817 return err; 818 } 819 820 void snd_oxfw_stream_lock_release(struct snd_oxfw *oxfw) 821 { 822 spin_lock_irq(&oxfw->lock); 823 824 if (WARN_ON(oxfw->dev_lock_count <= 0)) 825 goto end; 826 if (--oxfw->dev_lock_count == 0) 827 snd_oxfw_stream_lock_changed(oxfw); 828 end: 829 spin_unlock_irq(&oxfw->lock); 830 } 831