1 /* 2 * oxfw_stream.c - a part of driver for OXFW970/971 based devices 3 * 4 * Copyright (c) 2014 Takashi Sakamoto 5 * 6 * Licensed under the terms of the GNU General Public License, version 2. 7 */ 8 9 #include "oxfw.h" 10 #include <linux/delay.h> 11 12 #define AVC_GENERIC_FRAME_MAXIMUM_BYTES 512 13 #define CALLBACK_TIMEOUT 200 14 15 /* 16 * According to datasheet of Oxford Semiconductor: 17 * OXFW970: 32.0/44.1/48.0/96.0 Khz, 8 audio channels I/O 18 * OXFW971: 32.0/44.1/48.0/88.2/96.0/192.0 kHz, 16 audio channels I/O, MIDI I/O 19 */ 20 static const unsigned int oxfw_rate_table[] = { 21 [0] = 32000, 22 [1] = 44100, 23 [2] = 48000, 24 [3] = 88200, 25 [4] = 96000, 26 [5] = 192000, 27 }; 28 29 /* 30 * See Table 5.7 – Sampling frequency for Multi-bit Audio 31 * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA) 32 */ 33 static const unsigned int avc_stream_rate_table[] = { 34 [0] = 0x02, 35 [1] = 0x03, 36 [2] = 0x04, 37 [3] = 0x0a, 38 [4] = 0x05, 39 [5] = 0x07, 40 }; 41 42 static int set_rate(struct snd_oxfw *oxfw, unsigned int rate) 43 { 44 int err; 45 46 err = avc_general_set_sig_fmt(oxfw->unit, rate, 47 AVC_GENERAL_PLUG_DIR_IN, 0); 48 if (err < 0) 49 goto end; 50 51 if (oxfw->has_output) 52 err = avc_general_set_sig_fmt(oxfw->unit, rate, 53 AVC_GENERAL_PLUG_DIR_OUT, 0); 54 end: 55 return err; 56 } 57 58 static int set_stream_format(struct snd_oxfw *oxfw, struct amdtp_stream *s, 59 unsigned int rate, unsigned int pcm_channels) 60 { 61 u8 **formats; 62 struct snd_oxfw_stream_formation formation; 63 enum avc_general_plug_dir dir; 64 unsigned int len; 65 int i, err; 66 67 if (s == &oxfw->tx_stream) { 68 formats = oxfw->tx_stream_formats; 69 dir = AVC_GENERAL_PLUG_DIR_OUT; 70 } else { 71 formats = oxfw->rx_stream_formats; 72 dir = AVC_GENERAL_PLUG_DIR_IN; 73 } 74 75 /* Seek stream format for requirements. */ 76 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 77 err = snd_oxfw_stream_parse_format(formats[i], &formation); 78 if (err < 0) 79 return err; 80 81 if ((formation.rate == rate) && (formation.pcm == pcm_channels)) 82 break; 83 } 84 if (i == SND_OXFW_STREAM_FORMAT_ENTRIES) 85 return -EINVAL; 86 87 /* If assumed, just change rate. */ 88 if (oxfw->assumed) 89 return set_rate(oxfw, rate); 90 91 /* Calculate format length. */ 92 len = 5 + formats[i][4] * 2; 93 94 err = avc_stream_set_format(oxfw->unit, dir, 0, formats[i], len); 95 if (err < 0) 96 return err; 97 98 /* Some requests just after changing format causes freezing. */ 99 msleep(100); 100 101 return 0; 102 } 103 104 static int start_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 105 { 106 struct cmp_connection *conn; 107 int err; 108 109 if (stream == &oxfw->rx_stream) 110 conn = &oxfw->in_conn; 111 else 112 conn = &oxfw->out_conn; 113 114 err = cmp_connection_establish(conn); 115 if (err < 0) 116 return err; 117 118 err = amdtp_stream_start(stream, conn->resources.channel, conn->speed); 119 if (err < 0) { 120 cmp_connection_break(conn); 121 return err; 122 } 123 124 // Wait first packet. 125 if (!amdtp_stream_wait_callback(stream, CALLBACK_TIMEOUT)) { 126 amdtp_stream_stop(stream); 127 cmp_connection_break(conn); 128 return -ETIMEDOUT; 129 } 130 131 return 0; 132 } 133 134 static int check_connection_used_by_others(struct snd_oxfw *oxfw, 135 struct amdtp_stream *stream) 136 { 137 struct cmp_connection *conn; 138 bool used; 139 int err; 140 141 if (stream == &oxfw->tx_stream) 142 conn = &oxfw->out_conn; 143 else 144 conn = &oxfw->in_conn; 145 146 err = cmp_connection_check_used(conn, &used); 147 if ((err >= 0) && used && !amdtp_stream_running(stream)) { 148 dev_err(&oxfw->unit->device, 149 "Connection established by others: %cPCR[%d]\n", 150 (conn->direction == CMP_OUTPUT) ? 'o' : 'i', 151 conn->pcr_index); 152 err = -EBUSY; 153 } 154 155 return err; 156 } 157 158 static int init_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 159 { 160 struct cmp_connection *conn; 161 enum cmp_direction c_dir; 162 enum amdtp_stream_direction s_dir; 163 int err; 164 165 if (stream == &oxfw->tx_stream) { 166 conn = &oxfw->out_conn; 167 c_dir = CMP_OUTPUT; 168 s_dir = AMDTP_IN_STREAM; 169 } else { 170 conn = &oxfw->in_conn; 171 c_dir = CMP_INPUT; 172 s_dir = AMDTP_OUT_STREAM; 173 } 174 175 err = cmp_connection_init(conn, oxfw->unit, c_dir, 0); 176 if (err < 0) 177 return err; 178 179 err = amdtp_am824_init(stream, oxfw->unit, s_dir, CIP_NONBLOCKING); 180 if (err < 0) { 181 cmp_connection_destroy(conn); 182 return err; 183 } 184 185 /* 186 * OXFW starts to transmit packets with non-zero dbc. 187 * OXFW postpone transferring packets till handling any asynchronous 188 * packets. As a result, next isochronous packet includes more data 189 * blocks than IEC 61883-6 defines. 190 */ 191 if (stream == &oxfw->tx_stream) { 192 oxfw->tx_stream.flags |= CIP_JUMBO_PAYLOAD; 193 if (oxfw->wrong_dbs) 194 oxfw->tx_stream.flags |= CIP_WRONG_DBS; 195 } 196 197 return 0; 198 } 199 200 static int keep_resources(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 201 { 202 enum avc_general_plug_dir dir; 203 u8 **formats; 204 struct snd_oxfw_stream_formation formation; 205 struct cmp_connection *conn; 206 int i; 207 int err; 208 209 if (stream == &oxfw->rx_stream) { 210 dir = AVC_GENERAL_PLUG_DIR_IN; 211 formats = oxfw->rx_stream_formats; 212 conn = &oxfw->in_conn; 213 } else { 214 dir = AVC_GENERAL_PLUG_DIR_OUT; 215 formats = oxfw->tx_stream_formats; 216 conn = &oxfw->out_conn; 217 } 218 219 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation); 220 if (err < 0) 221 return err; 222 223 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 224 struct snd_oxfw_stream_formation fmt; 225 226 if (formats[i] == NULL) 227 break; 228 229 err = snd_oxfw_stream_parse_format(formats[i], &fmt); 230 if (err < 0) 231 return err; 232 233 if (fmt.rate == formation.rate && fmt.pcm == formation.pcm && 234 fmt.midi == formation.midi) 235 break; 236 } 237 if (i == SND_OXFW_STREAM_FORMAT_ENTRIES) 238 return -EINVAL; 239 240 // The stream should have one pcm channels at least. 241 if (formation.pcm == 0) 242 return -EINVAL; 243 244 err = amdtp_am824_set_parameters(stream, formation.rate, formation.pcm, 245 formation.midi * 8, false); 246 if (err < 0) 247 return err; 248 249 return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream)); 250 } 251 252 int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw, 253 struct amdtp_stream *stream, 254 unsigned int rate, unsigned int pcm_channels) 255 { 256 struct snd_oxfw_stream_formation formation; 257 enum avc_general_plug_dir dir; 258 int err; 259 260 // Considering JACK/FFADO streaming: 261 // TODO: This can be removed hwdep functionality becomes popular. 262 err = check_connection_used_by_others(oxfw, &oxfw->rx_stream); 263 if (err < 0) 264 return err; 265 if (oxfw->has_output) { 266 err = check_connection_used_by_others(oxfw, &oxfw->tx_stream); 267 if (err < 0) 268 return err; 269 } 270 271 if (stream == &oxfw->tx_stream) 272 dir = AVC_GENERAL_PLUG_DIR_OUT; 273 else 274 dir = AVC_GENERAL_PLUG_DIR_IN; 275 276 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation); 277 if (err < 0) 278 return err; 279 if (rate == 0) { 280 rate = formation.rate; 281 pcm_channels = formation.pcm; 282 } 283 if (formation.rate != rate || formation.pcm != pcm_channels) { 284 amdtp_stream_stop(&oxfw->rx_stream); 285 cmp_connection_break(&oxfw->in_conn); 286 287 if (oxfw->has_output) { 288 amdtp_stream_stop(&oxfw->tx_stream); 289 cmp_connection_break(&oxfw->out_conn); 290 } 291 } 292 293 if (oxfw->substreams_count == 0 || 294 formation.rate != rate || formation.pcm != pcm_channels) { 295 err = set_stream_format(oxfw, stream, rate, pcm_channels); 296 if (err < 0) { 297 dev_err(&oxfw->unit->device, 298 "fail to set stream format: %d\n", err); 299 return err; 300 } 301 302 err = keep_resources(oxfw, &oxfw->rx_stream); 303 if (err < 0) 304 return err; 305 306 if (oxfw->has_output) { 307 err = keep_resources(oxfw, &oxfw->tx_stream); 308 if (err < 0) { 309 cmp_connection_release(&oxfw->in_conn); 310 return err; 311 } 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_stream_stop(&oxfw->rx_stream); 328 cmp_connection_break(&oxfw->in_conn); 329 330 if (oxfw->has_output) { 331 amdtp_stream_stop(&oxfw->tx_stream); 332 cmp_connection_break(&oxfw->out_conn); 333 } 334 } 335 336 if (!amdtp_stream_running(&oxfw->rx_stream)) { 337 err = start_stream(oxfw, &oxfw->rx_stream); 338 if (err < 0) { 339 dev_err(&oxfw->unit->device, 340 "fail to start rx stream: %d\n", err); 341 goto error; 342 } 343 } 344 345 if (oxfw->has_output) { 346 if (!amdtp_stream_running(&oxfw->tx_stream)) { 347 err = start_stream(oxfw, &oxfw->tx_stream); 348 if (err < 0) { 349 dev_err(&oxfw->unit->device, 350 "fail to start tx stream: %d\n", err); 351 goto error; 352 } 353 } 354 } 355 356 return 0; 357 error: 358 amdtp_stream_stop(&oxfw->rx_stream); 359 cmp_connection_break(&oxfw->in_conn); 360 if (oxfw->has_output) { 361 amdtp_stream_stop(&oxfw->tx_stream); 362 cmp_connection_break(&oxfw->out_conn); 363 } 364 return err; 365 } 366 367 void snd_oxfw_stream_stop_duplex(struct snd_oxfw *oxfw) 368 { 369 if (oxfw->substreams_count == 0) { 370 amdtp_stream_stop(&oxfw->rx_stream); 371 cmp_connection_break(&oxfw->in_conn); 372 cmp_connection_release(&oxfw->in_conn); 373 374 if (oxfw->has_output) { 375 amdtp_stream_stop(&oxfw->tx_stream); 376 cmp_connection_break(&oxfw->out_conn); 377 cmp_connection_release(&oxfw->out_conn); 378 } 379 } 380 } 381 382 static void destroy_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream) 383 { 384 struct cmp_connection *conn; 385 386 if (stream == &oxfw->tx_stream) 387 conn = &oxfw->out_conn; 388 else 389 conn = &oxfw->in_conn; 390 391 amdtp_stream_destroy(stream); 392 cmp_connection_destroy(conn); 393 } 394 395 int snd_oxfw_stream_init_duplex(struct snd_oxfw *oxfw) 396 { 397 int err; 398 399 err = init_stream(oxfw, &oxfw->rx_stream); 400 if (err < 0) 401 return err; 402 403 if (oxfw->has_output) { 404 err = init_stream(oxfw, &oxfw->tx_stream); 405 if (err < 0) { 406 destroy_stream(oxfw, &oxfw->rx_stream); 407 return err; 408 } 409 } 410 411 return 0; 412 } 413 414 // This function should be called before starting the stream or after stopping 415 // the streams. 416 void snd_oxfw_stream_destroy_duplex(struct snd_oxfw *oxfw) 417 { 418 destroy_stream(oxfw, &oxfw->rx_stream); 419 420 if (oxfw->has_output) 421 destroy_stream(oxfw, &oxfw->tx_stream); 422 } 423 424 void snd_oxfw_stream_update_duplex(struct snd_oxfw *oxfw) 425 { 426 amdtp_stream_stop(&oxfw->rx_stream); 427 cmp_connection_break(&oxfw->in_conn); 428 429 amdtp_stream_pcm_abort(&oxfw->rx_stream); 430 431 if (oxfw->has_output) { 432 amdtp_stream_stop(&oxfw->tx_stream); 433 cmp_connection_break(&oxfw->out_conn); 434 435 amdtp_stream_pcm_abort(&oxfw->tx_stream); 436 } 437 } 438 439 int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw, 440 enum avc_general_plug_dir dir, 441 struct snd_oxfw_stream_formation *formation) 442 { 443 u8 *format; 444 unsigned int len; 445 int err; 446 447 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 448 format = kmalloc(len, GFP_KERNEL); 449 if (format == NULL) 450 return -ENOMEM; 451 452 err = avc_stream_get_format_single(oxfw->unit, dir, 0, format, &len); 453 if (err < 0) 454 goto end; 455 if (len < 3) { 456 err = -EIO; 457 goto end; 458 } 459 460 err = snd_oxfw_stream_parse_format(format, formation); 461 end: 462 kfree(format); 463 return err; 464 } 465 466 /* 467 * See Table 6.16 - AM824 Stream Format 468 * Figure 6.19 - format_information field for AM824 Compound 469 * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA) 470 * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005 471 */ 472 int snd_oxfw_stream_parse_format(u8 *format, 473 struct snd_oxfw_stream_formation *formation) 474 { 475 unsigned int i, e, channels, type; 476 477 memset(formation, 0, sizeof(struct snd_oxfw_stream_formation)); 478 479 /* 480 * this module can support a hierarchy combination that: 481 * Root: Audio and Music (0x90) 482 * Level 1: AM824 Compound (0x40) 483 */ 484 if ((format[0] != 0x90) || (format[1] != 0x40)) 485 return -ENOSYS; 486 487 /* check the sampling rate */ 488 for (i = 0; i < ARRAY_SIZE(avc_stream_rate_table); i++) { 489 if (format[2] == avc_stream_rate_table[i]) 490 break; 491 } 492 if (i == ARRAY_SIZE(avc_stream_rate_table)) 493 return -ENOSYS; 494 495 formation->rate = oxfw_rate_table[i]; 496 497 for (e = 0; e < format[4]; e++) { 498 channels = format[5 + e * 2]; 499 type = format[6 + e * 2]; 500 501 switch (type) { 502 /* IEC 60958 Conformant, currently handled as MBLA */ 503 case 0x00: 504 /* Multi Bit Linear Audio (Raw) */ 505 case 0x06: 506 formation->pcm += channels; 507 break; 508 /* MIDI Conformant */ 509 case 0x0d: 510 formation->midi = channels; 511 break; 512 /* IEC 61937-3 to 7 */ 513 case 0x01: 514 case 0x02: 515 case 0x03: 516 case 0x04: 517 case 0x05: 518 /* Multi Bit Linear Audio */ 519 case 0x07: /* DVD-Audio */ 520 case 0x0c: /* High Precision */ 521 /* One Bit Audio */ 522 case 0x08: /* (Plain) Raw */ 523 case 0x09: /* (Plain) SACD */ 524 case 0x0a: /* (Encoded) Raw */ 525 case 0x0b: /* (Encoded) SACD */ 526 /* SMPTE Time-Code conformant */ 527 case 0x0e: 528 /* Sample Count */ 529 case 0x0f: 530 /* Anciliary Data */ 531 case 0x10: 532 /* Synchronization Stream (Stereo Raw audio) */ 533 case 0x40: 534 /* Don't care */ 535 case 0xff: 536 default: 537 return -ENOSYS; /* not supported */ 538 } 539 } 540 541 if (formation->pcm > AM824_MAX_CHANNELS_FOR_PCM || 542 formation->midi > AM824_MAX_CHANNELS_FOR_MIDI) 543 return -ENOSYS; 544 545 return 0; 546 } 547 548 static int 549 assume_stream_formats(struct snd_oxfw *oxfw, enum avc_general_plug_dir dir, 550 unsigned int pid, u8 *buf, unsigned int *len, 551 u8 **formats) 552 { 553 struct snd_oxfw_stream_formation formation; 554 unsigned int i, eid; 555 int err; 556 557 /* get format at current sampling rate */ 558 err = avc_stream_get_format_single(oxfw->unit, dir, pid, buf, len); 559 if (err < 0) { 560 dev_err(&oxfw->unit->device, 561 "fail to get current stream format for isoc %s plug %d:%d\n", 562 (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out", 563 pid, err); 564 goto end; 565 } 566 567 /* parse and set stream format */ 568 eid = 0; 569 err = snd_oxfw_stream_parse_format(buf, &formation); 570 if (err < 0) 571 goto end; 572 573 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len, 574 GFP_KERNEL); 575 if (!formats[eid]) { 576 err = -ENOMEM; 577 goto end; 578 } 579 580 /* apply the format for each available sampling rate */ 581 for (i = 0; i < ARRAY_SIZE(oxfw_rate_table); i++) { 582 if (formation.rate == oxfw_rate_table[i]) 583 continue; 584 585 err = avc_general_inquiry_sig_fmt(oxfw->unit, 586 oxfw_rate_table[i], 587 dir, pid); 588 if (err < 0) 589 continue; 590 591 eid++; 592 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len, 593 GFP_KERNEL); 594 if (formats[eid] == NULL) { 595 err = -ENOMEM; 596 goto end; 597 } 598 formats[eid][2] = avc_stream_rate_table[i]; 599 } 600 601 err = 0; 602 oxfw->assumed = true; 603 end: 604 return err; 605 } 606 607 static int fill_stream_formats(struct snd_oxfw *oxfw, 608 enum avc_general_plug_dir dir, 609 unsigned short pid) 610 { 611 u8 *buf, **formats; 612 unsigned int len, eid = 0; 613 struct snd_oxfw_stream_formation dummy; 614 int err; 615 616 buf = kmalloc(AVC_GENERIC_FRAME_MAXIMUM_BYTES, GFP_KERNEL); 617 if (buf == NULL) 618 return -ENOMEM; 619 620 if (dir == AVC_GENERAL_PLUG_DIR_OUT) 621 formats = oxfw->tx_stream_formats; 622 else 623 formats = oxfw->rx_stream_formats; 624 625 /* get first entry */ 626 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 627 err = avc_stream_get_format_list(oxfw->unit, dir, 0, buf, &len, 0); 628 if (err == -ENOSYS) { 629 /* LIST subfunction is not implemented */ 630 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 631 err = assume_stream_formats(oxfw, dir, pid, buf, &len, 632 formats); 633 goto end; 634 } else if (err < 0) { 635 dev_err(&oxfw->unit->device, 636 "fail to get stream format %d for isoc %s plug %d:%d\n", 637 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out", 638 pid, err); 639 goto end; 640 } 641 642 /* LIST subfunction is implemented */ 643 while (eid < SND_OXFW_STREAM_FORMAT_ENTRIES) { 644 /* The format is too short. */ 645 if (len < 3) { 646 err = -EIO; 647 break; 648 } 649 650 /* parse and set stream format */ 651 err = snd_oxfw_stream_parse_format(buf, &dummy); 652 if (err < 0) 653 break; 654 655 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, len, 656 GFP_KERNEL); 657 if (!formats[eid]) { 658 err = -ENOMEM; 659 break; 660 } 661 662 /* get next entry */ 663 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES; 664 err = avc_stream_get_format_list(oxfw->unit, dir, 0, 665 buf, &len, ++eid); 666 /* No entries remained. */ 667 if (err == -EINVAL) { 668 err = 0; 669 break; 670 } else if (err < 0) { 671 dev_err(&oxfw->unit->device, 672 "fail to get stream format %d for isoc %s plug %d:%d\n", 673 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : 674 "out", 675 pid, err); 676 break; 677 } 678 } 679 end: 680 kfree(buf); 681 return err; 682 } 683 684 int snd_oxfw_stream_discover(struct snd_oxfw *oxfw) 685 { 686 u8 plugs[AVC_PLUG_INFO_BUF_BYTES]; 687 struct snd_oxfw_stream_formation formation; 688 u8 *format; 689 unsigned int i; 690 int err; 691 692 /* the number of plugs for isoc in/out, ext in/out */ 693 err = avc_general_get_plug_info(oxfw->unit, 0x1f, 0x07, 0x00, plugs); 694 if (err < 0) { 695 dev_err(&oxfw->unit->device, 696 "fail to get info for isoc/external in/out plugs: %d\n", 697 err); 698 goto end; 699 } else if ((plugs[0] == 0) && (plugs[1] == 0)) { 700 err = -ENOSYS; 701 goto end; 702 } 703 704 /* use oPCR[0] if exists */ 705 if (plugs[1] > 0) { 706 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_OUT, 0); 707 if (err < 0) 708 goto end; 709 710 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 711 format = oxfw->tx_stream_formats[i]; 712 if (format == NULL) 713 continue; 714 err = snd_oxfw_stream_parse_format(format, &formation); 715 if (err < 0) 716 continue; 717 718 /* Add one MIDI port. */ 719 if (formation.midi > 0) 720 oxfw->midi_input_ports = 1; 721 } 722 723 oxfw->has_output = true; 724 } 725 726 /* use iPCR[0] if exists */ 727 if (plugs[0] > 0) { 728 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_IN, 0); 729 if (err < 0) 730 goto end; 731 732 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) { 733 format = oxfw->rx_stream_formats[i]; 734 if (format == NULL) 735 continue; 736 err = snd_oxfw_stream_parse_format(format, &formation); 737 if (err < 0) 738 continue; 739 740 /* Add one MIDI port. */ 741 if (formation.midi > 0) 742 oxfw->midi_output_ports = 1; 743 } 744 } 745 end: 746 return err; 747 } 748 749 void snd_oxfw_stream_lock_changed(struct snd_oxfw *oxfw) 750 { 751 oxfw->dev_lock_changed = true; 752 wake_up(&oxfw->hwdep_wait); 753 } 754 755 int snd_oxfw_stream_lock_try(struct snd_oxfw *oxfw) 756 { 757 int err; 758 759 spin_lock_irq(&oxfw->lock); 760 761 /* user land lock this */ 762 if (oxfw->dev_lock_count < 0) { 763 err = -EBUSY; 764 goto end; 765 } 766 767 /* this is the first time */ 768 if (oxfw->dev_lock_count++ == 0) 769 snd_oxfw_stream_lock_changed(oxfw); 770 err = 0; 771 end: 772 spin_unlock_irq(&oxfw->lock); 773 return err; 774 } 775 776 void snd_oxfw_stream_lock_release(struct snd_oxfw *oxfw) 777 { 778 spin_lock_irq(&oxfw->lock); 779 780 if (WARN_ON(oxfw->dev_lock_count <= 0)) 781 goto end; 782 if (--oxfw->dev_lock_count == 0) 783 snd_oxfw_stream_lock_changed(oxfw); 784 end: 785 spin_unlock_irq(&oxfw->lock); 786 } 787