sound/firewire/oxfw/oxfw-stream.c

   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 READY_TIMEOUT_MS        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, false);
 358                 if (err < 0)
 359                         goto error;
 360
 361                 if (!amdtp_domain_wait_ready(&oxfw->domain, READY_TIMEOUT_MS)) {
 362                         err = -ETIMEDOUT;
 363                         goto error;
 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 -ENXIO;
 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 -ENXIO;
 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 -ENXIO;  /* not supported */
 558                 }
 559         }
 560
 561         if (formation->pcm  > AM824_MAX_CHANNELS_FOR_PCM ||
 562             formation->midi > AM824_MAX_CHANNELS_FOR_MIDI)
 563                 return -ENXIO;
 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 == -ENXIO) {
 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 = -ENXIO;
 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                         if (err != -ENXIO)
 729                                 return err;
 730
 731                         // The oPCR is not available for isoc communication.
 732                         err = 0;
 733                 } else {
 734                         for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
 735                                 format = oxfw->tx_stream_formats[i];
 736                                 if (format == NULL)
 737                                         continue;
 738                                 err = snd_oxfw_stream_parse_format(format,
 739                                                                    &formation);
 740                                 if (err < 0)
 741                                         continue;
 742
 743                                 /* Add one MIDI port. */
 744                                 if (formation.midi > 0)
 745                                         oxfw->midi_input_ports = 1;
 746                         }
 747
 748                         oxfw->has_output = true;
 749                 }
 750         }
 751
 752         /* use iPCR[0] if exists */
 753         if (plugs[0] > 0) {
 754                 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_IN, 0);
 755                 if (err < 0) {
 756                         if (err != -ENXIO)
 757                                 return err;
 758
 759                         // The iPCR is not available for isoc communication.
 760                         err = 0;
 761                 } else {
 762                         for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
 763                                 format = oxfw->rx_stream_formats[i];
 764                                 if (format == NULL)
 765                                         continue;
 766                                 err = snd_oxfw_stream_parse_format(format,
 767                                                                    &formation);
 768                                 if (err < 0)
 769                                         continue;
 770
 771                                 /* Add one MIDI port. */
 772                                 if (formation.midi > 0)
 773                                         oxfw->midi_output_ports = 1;
 774                         }
 775
 776                         oxfw->has_input = true;
 777                 }
 778         }
 779 end:
 780         return err;
 781 }
 782
 783 void snd_oxfw_stream_lock_changed(struct snd_oxfw *oxfw)
 784 {
 785         oxfw->dev_lock_changed = true;
 786         wake_up(&oxfw->hwdep_wait);
 787 }
 788
 789 int snd_oxfw_stream_lock_try(struct snd_oxfw *oxfw)
 790 {
 791         int err;
 792
 793         spin_lock_irq(&oxfw->lock);
 794
 795         /* user land lock this */
 796         if (oxfw->dev_lock_count < 0) {
 797                 err = -EBUSY;
 798                 goto end;
 799         }
 800
 801         /* this is the first time */
 802         if (oxfw->dev_lock_count++ == 0)
 803                 snd_oxfw_stream_lock_changed(oxfw);
 804         err = 0;
 805 end:
 806         spin_unlock_irq(&oxfw->lock);
 807         return err;
 808 }
 809
 810 void snd_oxfw_stream_lock_release(struct snd_oxfw *oxfw)
 811 {
 812         spin_lock_irq(&oxfw->lock);
 813
 814         if (WARN_ON(oxfw->dev_lock_count <= 0))
 815                 goto end;
 816         if (--oxfw->dev_lock_count == 0)
 817                 snd_oxfw_stream_lock_changed(oxfw);
 818 end:
 819         spin_unlock_irq(&oxfw->lock);
 820 }