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