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