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