sound/firewire/bebob/bebob_stream.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * bebob_stream.c - a part of driver for BeBoB based devices
   4  *
   5  * Copyright (c) 2013-2014 Takashi Sakamoto
   6  */
   7
   8 #include "./bebob.h"
   9
  10 #define CALLBACK_TIMEOUT        2000
  11 #define FW_ISO_RESOURCE_DELAY   1000
  12
  13 /*
  14  * NOTE;
  15  * For BeBoB streams, Both of input and output CMP connection are important.
  16  *
  17  * For most devices, each CMP connection starts to transmit/receive a
  18  * corresponding stream. But for a few devices, both of CMP connection needs
  19  * to start transmitting stream. An example is 'M-Audio Firewire 410'.
  20  */
  21
  22 /* 128 is an arbitrary length but it seems to be enough */
  23 #define FORMAT_MAXIMUM_LENGTH 128
  24
  25 const unsigned int snd_bebob_rate_table[SND_BEBOB_STRM_FMT_ENTRIES] = {
  26         [0] = 32000,
  27         [1] = 44100,
  28         [2] = 48000,
  29         [3] = 88200,
  30         [4] = 96000,
  31         [5] = 176400,
  32         [6] = 192000,
  33 };
  34
  35 /*
  36  * See: Table 51: Extended Stream Format Info ‘Sampling Frequency’
  37  * in Additional AVC commands (Nov 2003, BridgeCo)
  38  */
  39 static const unsigned int bridgeco_freq_table[] = {
  40         [0] = 0x02,
  41         [1] = 0x03,
  42         [2] = 0x04,
  43         [3] = 0x0a,
  44         [4] = 0x05,
  45         [5] = 0x06,
  46         [6] = 0x07,
  47 };
  48
  49 static int
  50 get_formation_index(unsigned int rate, unsigned int *index)
  51 {
  52         unsigned int i;
  53
  54         for (i = 0; i < ARRAY_SIZE(snd_bebob_rate_table); i++) {
  55                 if (snd_bebob_rate_table[i] == rate) {
  56                         *index = i;
  57                         return 0;
  58                 }
  59         }
  60         return -EINVAL;
  61 }
  62
  63 int
  64 snd_bebob_stream_get_rate(struct snd_bebob *bebob, unsigned int *curr_rate)
  65 {
  66         unsigned int tx_rate, rx_rate, trials;
  67         int err;
  68
  69         trials = 0;
  70         do {
  71                 err = avc_general_get_sig_fmt(bebob->unit, &tx_rate,
  72                                               AVC_GENERAL_PLUG_DIR_OUT, 0);
  73         } while (err == -EAGAIN && ++trials < 3);
  74         if (err < 0)
  75                 goto end;
  76
  77         trials = 0;
  78         do {
  79                 err = avc_general_get_sig_fmt(bebob->unit, &rx_rate,
  80                                               AVC_GENERAL_PLUG_DIR_IN, 0);
  81         } while (err == -EAGAIN && ++trials < 3);
  82         if (err < 0)
  83                 goto end;
  84
  85         *curr_rate = rx_rate;
  86         if (rx_rate == tx_rate)
  87                 goto end;
  88
  89         /* synchronize receive stream rate to transmit stream rate */
  90         err = avc_general_set_sig_fmt(bebob->unit, rx_rate,
  91                                       AVC_GENERAL_PLUG_DIR_IN, 0);
  92 end:
  93         return err;
  94 }
  95
  96 int
  97 snd_bebob_stream_set_rate(struct snd_bebob *bebob, unsigned int rate)
  98 {
  99         int err;
 100
 101         err = avc_general_set_sig_fmt(bebob->unit, rate,
 102                                       AVC_GENERAL_PLUG_DIR_OUT, 0);
 103         if (err < 0)
 104                 goto end;
 105
 106         err = avc_general_set_sig_fmt(bebob->unit, rate,
 107                                       AVC_GENERAL_PLUG_DIR_IN, 0);
 108         if (err < 0)
 109                 goto end;
 110
 111         /*
 112          * Some devices need a bit time for transition.
 113          * 300msec is got by some experiments.
 114          */
 115         msleep(300);
 116 end:
 117         return err;
 118 }
 119
 120 int snd_bebob_stream_get_clock_src(struct snd_bebob *bebob,
 121                                    enum snd_bebob_clock_type *src)
 122 {
 123         const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
 124         u8 addr[AVC_BRIDGECO_ADDR_BYTES], input[7];
 125         unsigned int id;
 126         enum avc_bridgeco_plug_type type;
 127         int err = 0;
 128
 129         /* 1.The device has its own operation to switch source of clock */
 130         if (clk_spec) {
 131                 err = clk_spec->get(bebob, &id);
 132                 if (err < 0) {
 133                         dev_err(&bebob->unit->device,
 134                                 "fail to get clock source: %d\n", err);
 135                         goto end;
 136                 }
 137
 138                 if (id >= clk_spec->num) {
 139                         dev_err(&bebob->unit->device,
 140                                 "clock source %d out of range 0..%d\n",
 141                                 id, clk_spec->num - 1);
 142                         err = -EIO;
 143                         goto end;
 144                 }
 145
 146                 *src = clk_spec->types[id];
 147                 goto end;
 148         }
 149
 150         /*
 151          * 2.The device don't support to switch source of clock then assumed
 152          *   to use internal clock always
 153          */
 154         if (bebob->sync_input_plug < 0) {
 155                 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
 156                 goto end;
 157         }
 158
 159         /*
 160          * 3.The device supports to switch source of clock by an usual way.
 161          *   Let's check input for 'Music Sub Unit Sync Input' plug.
 162          */
 163         avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
 164                                    bebob->sync_input_plug);
 165         err = avc_bridgeco_get_plug_input(bebob->unit, addr, input);
 166         if (err < 0) {
 167                 dev_err(&bebob->unit->device,
 168                         "fail to get an input for MSU in plug %d: %d\n",
 169                         bebob->sync_input_plug, err);
 170                 goto end;
 171         }
 172
 173         /*
 174          * If there are no input plugs, all of fields are 0xff.
 175          * Here check the first field. This field is used for direction.
 176          */
 177         if (input[0] == 0xff) {
 178                 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
 179                 goto end;
 180         }
 181
 182         /* The source from any output plugs is for one purpose only. */
 183         if (input[0] == AVC_BRIDGECO_PLUG_DIR_OUT) {
 184                 /*
 185                  * In BeBoB architecture, the source from music subunit may
 186                  * bypass from oPCR[0]. This means that this source gives
 187                  * synchronization to IEEE 1394 cycle start packet.
 188                  */
 189                 if (input[1] == AVC_BRIDGECO_PLUG_MODE_SUBUNIT &&
 190                     input[2] == 0x0c) {
 191                         *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
 192                         goto end;
 193                 }
 194         /* The source from any input units is for several purposes. */
 195         } else if (input[1] == AVC_BRIDGECO_PLUG_MODE_UNIT) {
 196                 if (input[2] == AVC_BRIDGECO_PLUG_UNIT_ISOC) {
 197                         if (input[3] == 0x00) {
 198                                 /*
 199                                  * This source comes from iPCR[0]. This means
 200                                  * that presentation timestamp calculated by
 201                                  * SYT series of the received packets. In
 202                                  * short, this driver is the master of
 203                                  * synchronization.
 204                                  */
 205                                 *src = SND_BEBOB_CLOCK_TYPE_SYT;
 206                                 goto end;
 207                         } else {
 208                                 /*
 209                                  * This source comes from iPCR[1-29]. This
 210                                  * means that the synchronization stream is not
 211                                  * the Audio/MIDI compound stream.
 212                                  */
 213                                 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
 214                                 goto end;
 215                         }
 216                 } else if (input[2] == AVC_BRIDGECO_PLUG_UNIT_EXT) {
 217                         /* Check type of this plug.  */
 218                         avc_bridgeco_fill_unit_addr(addr,
 219                                                     AVC_BRIDGECO_PLUG_DIR_IN,
 220                                                     AVC_BRIDGECO_PLUG_UNIT_EXT,
 221                                                     input[3]);
 222                         err = avc_bridgeco_get_plug_type(bebob->unit, addr,
 223                                                          &type);
 224                         if (err < 0)
 225                                 goto end;
 226
 227                         if (type == AVC_BRIDGECO_PLUG_TYPE_DIG) {
 228                                 /*
 229                                  * SPDIF/ADAT or sometimes (not always) word
 230                                  * clock.
 231                                  */
 232                                 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
 233                                 goto end;
 234                         } else if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
 235                                 /* Often word clock. */
 236                                 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
 237                                 goto end;
 238                         } else if (type == AVC_BRIDGECO_PLUG_TYPE_ADDITION) {
 239                                 /*
 240                                  * Not standard.
 241                                  * Mostly, additional internal clock.
 242                                  */
 243                                 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
 244                                 goto end;
 245                         }
 246                 }
 247         }
 248
 249         /* Not supported. */
 250         err = -EIO;
 251 end:
 252         return err;
 253 }
 254
 255 static unsigned int
 256 map_data_channels(struct snd_bebob *bebob, struct amdtp_stream *s)
 257 {
 258         unsigned int sec, sections, ch, channels;
 259         unsigned int pcm, midi, location;
 260         unsigned int stm_pos, sec_loc, pos;
 261         u8 *buf, addr[AVC_BRIDGECO_ADDR_BYTES], type;
 262         enum avc_bridgeco_plug_dir dir;
 263         int err;
 264
 265         /*
 266          * The length of return value of this command cannot be expected. Here
 267          * use the maximum length of FCP.
 268          */
 269         buf = kzalloc(256, GFP_KERNEL);
 270         if (buf == NULL)
 271                 return -ENOMEM;
 272
 273         if (s == &bebob->tx_stream)
 274                 dir = AVC_BRIDGECO_PLUG_DIR_OUT;
 275         else
 276                 dir = AVC_BRIDGECO_PLUG_DIR_IN;
 277
 278         avc_bridgeco_fill_unit_addr(addr, dir, AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 279         err = avc_bridgeco_get_plug_ch_pos(bebob->unit, addr, buf, 256);
 280         if (err < 0) {
 281                 dev_err(&bebob->unit->device,
 282                         "fail to get channel position for isoc %s plug 0: %d\n",
 283                         (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" : "out",
 284                         err);
 285                 goto end;
 286         }
 287         pos = 0;
 288
 289         /* positions in I/O buffer */
 290         pcm = 0;
 291         midi = 0;
 292
 293         /* the number of sections in AMDTP packet */
 294         sections = buf[pos++];
 295
 296         for (sec = 0; sec < sections; sec++) {
 297                 /* type of this section */
 298                 avc_bridgeco_fill_unit_addr(addr, dir,
 299                                             AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 300                 err = avc_bridgeco_get_plug_section_type(bebob->unit, addr,
 301                                                          sec, &type);
 302                 if (err < 0) {
 303                         dev_err(&bebob->unit->device,
 304                         "fail to get section type for isoc %s plug 0: %d\n",
 305                                 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :
 306                                                                     "out",
 307                                 err);
 308                         goto end;
 309                 }
 310                 /* NoType */
 311                 if (type == 0xff) {
 312                         err = -ENOSYS;
 313                         goto end;
 314                 }
 315
 316                 /* the number of channels in this section */
 317                 channels = buf[pos++];
 318
 319                 for (ch = 0; ch < channels; ch++) {
 320                         /* position of this channel in AMDTP packet */
 321                         stm_pos = buf[pos++] - 1;
 322                         /* location of this channel in this section */
 323                         sec_loc = buf[pos++] - 1;
 324
 325                         /*
 326                          * Basically the number of location is within the
 327                          * number of channels in this section. But some models
 328                          * of M-Audio don't follow this. Its location for MIDI
 329                          * is the position of MIDI channels in AMDTP packet.
 330                          */
 331                         if (sec_loc >= channels)
 332                                 sec_loc = ch;
 333
 334                         switch (type) {
 335                         /* for MIDI conformant data channel */
 336                         case 0x0a:
 337                                 /* AMDTP_MAX_CHANNELS_FOR_MIDI is 1. */
 338                                 if ((midi > 0) && (stm_pos != midi)) {
 339                                         err = -ENOSYS;
 340                                         goto end;
 341                                 }
 342                                 amdtp_am824_set_midi_position(s, stm_pos);
 343                                 midi = stm_pos;
 344                                 break;
 345                         /* for PCM data channel */
 346                         case 0x01:      /* Headphone */
 347                         case 0x02:      /* Microphone */
 348                         case 0x03:      /* Line */
 349                         case 0x04:      /* SPDIF */
 350                         case 0x05:      /* ADAT */
 351                         case 0x06:      /* TDIF */
 352                         case 0x07:      /* MADI */
 353                         /* for undefined/changeable signal  */
 354                         case 0x08:      /* Analog */
 355                         case 0x09:      /* Digital */
 356                         default:
 357                                 location = pcm + sec_loc;
 358                                 if (location >= AM824_MAX_CHANNELS_FOR_PCM) {
 359                                         err = -ENOSYS;
 360                                         goto end;
 361                                 }
 362                                 amdtp_am824_set_pcm_position(s, location,
 363                                                              stm_pos);
 364                                 break;
 365                         }
 366                 }
 367
 368                 if (type != 0x0a)
 369                         pcm += channels;
 370                 else
 371                         midi += channels;
 372         }
 373 end:
 374         kfree(buf);
 375         return err;
 376 }
 377
 378 static int
 379 check_connection_used_by_others(struct snd_bebob *bebob, struct amdtp_stream *s)
 380 {
 381         struct cmp_connection *conn;
 382         bool used;
 383         int err;
 384
 385         if (s == &bebob->tx_stream)
 386                 conn = &bebob->out_conn;
 387         else
 388                 conn = &bebob->in_conn;
 389
 390         err = cmp_connection_check_used(conn, &used);
 391         if ((err >= 0) && used && !amdtp_stream_running(s)) {
 392                 dev_err(&bebob->unit->device,
 393                         "Connection established by others: %cPCR[%d]\n",
 394                         (conn->direction == CMP_OUTPUT) ? 'o' : 'i',
 395                         conn->pcr_index);
 396                 err = -EBUSY;
 397         }
 398
 399         return err;
 400 }
 401
 402 static int make_both_connections(struct snd_bebob *bebob)
 403 {
 404         int err = 0;
 405
 406         err = cmp_connection_establish(&bebob->out_conn);
 407         if (err < 0)
 408                 return err;
 409
 410         err = cmp_connection_establish(&bebob->in_conn);
 411         if (err < 0) {
 412                 cmp_connection_break(&bebob->out_conn);
 413                 return err;
 414         }
 415
 416         return 0;
 417 }
 418
 419 static void
 420 break_both_connections(struct snd_bebob *bebob)
 421 {
 422         cmp_connection_break(&bebob->in_conn);
 423         cmp_connection_break(&bebob->out_conn);
 424
 425         /* These models seems to be in transition state for a longer time. */
 426         if (bebob->maudio_special_quirk != NULL)
 427                 msleep(200);
 428 }
 429
 430 static int
 431 start_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
 432 {
 433         struct cmp_connection *conn;
 434         int err = 0;
 435
 436         if (stream == &bebob->rx_stream)
 437                 conn = &bebob->in_conn;
 438         else
 439                 conn = &bebob->out_conn;
 440
 441         /* channel mapping */
 442         if (bebob->maudio_special_quirk == NULL) {
 443                 err = map_data_channels(bebob, stream);
 444                 if (err < 0)
 445                         goto end;
 446         }
 447
 448         /* start amdtp stream */
 449         err = amdtp_stream_start(stream,
 450                                  conn->resources.channel,
 451                                  conn->speed);
 452 end:
 453         return err;
 454 }
 455
 456 static int init_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
 457 {
 458         enum amdtp_stream_direction dir_stream;
 459         struct cmp_connection *conn;
 460         enum cmp_direction dir_conn;
 461         int err;
 462
 463         if (stream == &bebob->tx_stream) {
 464                 dir_stream = AMDTP_IN_STREAM;
 465                 conn = &bebob->out_conn;
 466                 dir_conn = CMP_OUTPUT;
 467         } else {
 468                 dir_stream = AMDTP_OUT_STREAM;
 469                 conn = &bebob->in_conn;
 470                 dir_conn = CMP_INPUT;
 471         }
 472
 473         err = cmp_connection_init(conn, bebob->unit, dir_conn, 0);
 474         if (err < 0)
 475                 return err;
 476
 477         err = amdtp_am824_init(stream, bebob->unit, dir_stream, CIP_BLOCKING);
 478         if (err < 0) {
 479                 cmp_connection_destroy(conn);
 480                 return err;
 481         }
 482
 483         if (stream == &bebob->tx_stream) {
 484                 // BeBoB v3 transfers packets with these qurks:
 485                 //  - In the beginning of streaming, the value of dbc is
 486                 //    incremented even if no data blocks are transferred.
 487                 //  - The value of dbc is reset suddenly.
 488                 if (bebob->version > 2)
 489                         bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC |
 490                                                   CIP_SKIP_DBC_ZERO_CHECK;
 491
 492                 // At high sampling rate, M-Audio special firmware transmits
 493                 // empty packet with the value of dbc incremented by 8 but the
 494                 // others are valid to IEC 61883-1.
 495                 if (bebob->maudio_special_quirk)
 496                         bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC;
 497         }
 498
 499         return 0;
 500 }
 501
 502 static void destroy_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
 503 {
 504         amdtp_stream_destroy(stream);
 505
 506         if (stream == &bebob->tx_stream)
 507                 cmp_connection_destroy(&bebob->out_conn);
 508         else
 509                 cmp_connection_destroy(&bebob->in_conn);
 510 }
 511
 512 int snd_bebob_stream_init_duplex(struct snd_bebob *bebob)
 513 {
 514         int err;
 515
 516         err = init_stream(bebob, &bebob->tx_stream);
 517         if (err < 0)
 518                 return err;
 519
 520         err = init_stream(bebob, &bebob->rx_stream);
 521         if (err < 0) {
 522                 destroy_stream(bebob, &bebob->tx_stream);
 523                 return err;
 524         }
 525
 526         return 0;
 527 }
 528
 529 static int keep_resources(struct snd_bebob *bebob, struct amdtp_stream *stream,
 530                           unsigned int rate, unsigned int index)
 531 {
 532         struct snd_bebob_stream_formation *formation;
 533         struct cmp_connection *conn;
 534         int err;
 535
 536         if (stream == &bebob->tx_stream) {
 537                 formation = bebob->tx_stream_formations + index;
 538                 conn = &bebob->out_conn;
 539         } else {
 540                 formation = bebob->rx_stream_formations + index;
 541                 conn = &bebob->in_conn;
 542         }
 543
 544         err = amdtp_am824_set_parameters(stream, rate, formation->pcm,
 545                                          formation->midi, false);
 546         if (err < 0)
 547                 return err;
 548
 549         return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream));
 550 }
 551
 552 int snd_bebob_stream_reserve_duplex(struct snd_bebob *bebob, unsigned int rate)
 553 {
 554         unsigned int curr_rate;
 555         int err;
 556
 557         // Considering JACK/FFADO streaming:
 558         // TODO: This can be removed hwdep functionality becomes popular.
 559         err = check_connection_used_by_others(bebob, &bebob->rx_stream);
 560         if (err < 0)
 561                 return err;
 562
 563         err = bebob->spec->rate->get(bebob, &curr_rate);
 564         if (err < 0)
 565                 return err;
 566         if (rate == 0)
 567                 rate = curr_rate;
 568         if (curr_rate != rate) {
 569                 amdtp_stream_stop(&bebob->tx_stream);
 570                 amdtp_stream_stop(&bebob->rx_stream);
 571
 572                 break_both_connections(bebob);
 573
 574                 cmp_connection_release(&bebob->out_conn);
 575                 cmp_connection_release(&bebob->in_conn);
 576         }
 577
 578         if (bebob->substreams_counter == 0 || curr_rate != rate) {
 579                 unsigned int index;
 580
 581                 // NOTE:
 582                 // If establishing connections at first, Yamaha GO46
 583                 // (and maybe Terratec X24) don't generate sound.
 584                 //
 585                 // For firmware customized by M-Audio, refer to next NOTE.
 586                 err = bebob->spec->rate->set(bebob, rate);
 587                 if (err < 0) {
 588                         dev_err(&bebob->unit->device,
 589                                 "fail to set sampling rate: %d\n",
 590                                 err);
 591                         return err;
 592                 }
 593
 594                 err = get_formation_index(rate, &index);
 595                 if (err < 0)
 596                         return err;
 597
 598                 err = keep_resources(bebob, &bebob->tx_stream, rate, index);
 599                 if (err < 0)
 600                         return err;
 601
 602                 err = keep_resources(bebob, &bebob->rx_stream, rate, index);
 603                 if (err < 0) {
 604                         cmp_connection_release(&bebob->out_conn);
 605                         return err;
 606                 }
 607         }
 608
 609         return 0;
 610 }
 611
 612 int snd_bebob_stream_start_duplex(struct snd_bebob *bebob)
 613 {
 614         int err;
 615
 616         // Need no substreams.
 617         if (bebob->substreams_counter == 0)
 618                 return -EIO;
 619
 620         // packet queueing error or detecting discontinuity
 621         if (amdtp_streaming_error(&bebob->rx_stream) ||
 622             amdtp_streaming_error(&bebob->tx_stream)) {
 623                 amdtp_stream_stop(&bebob->rx_stream);
 624                 amdtp_stream_stop(&bebob->tx_stream);
 625
 626                 break_both_connections(bebob);
 627         }
 628
 629         if (!amdtp_stream_running(&bebob->rx_stream)) {
 630                 unsigned int curr_rate;
 631
 632                 if (bebob->maudio_special_quirk) {
 633                         err = bebob->spec->rate->get(bebob, &curr_rate);
 634                         if (err < 0)
 635                                 return err;
 636                 }
 637
 638                 err = make_both_connections(bebob);
 639                 if (err < 0)
 640                         return err;
 641
 642                 err = start_stream(bebob, &bebob->rx_stream);
 643                 if (err < 0) {
 644                         dev_err(&bebob->unit->device,
 645                                 "fail to run AMDTP master stream:%d\n", err);
 646                         goto error;
 647                 }
 648
 649                 // NOTE:
 650                 // The firmware customized by M-Audio uses these commands to
 651                 // start transmitting stream. This is not usual way.
 652                 if (bebob->maudio_special_quirk) {
 653                         err = bebob->spec->rate->set(bebob, curr_rate);
 654                         if (err < 0) {
 655                                 dev_err(&bebob->unit->device,
 656                                         "fail to ensure sampling rate: %d\n",
 657                                         err);
 658                                 goto error;
 659                         }
 660                 }
 661
 662                 if (!amdtp_stream_wait_callback(&bebob->rx_stream,
 663                                                 CALLBACK_TIMEOUT)) {
 664                         err = -ETIMEDOUT;
 665                         goto error;
 666                 }
 667         }
 668
 669         if (!amdtp_stream_running(&bebob->tx_stream)) {
 670                 err = start_stream(bebob, &bebob->tx_stream);
 671                 if (err < 0) {
 672                         dev_err(&bebob->unit->device,
 673                                 "fail to run AMDTP slave stream:%d\n", err);
 674                         goto error;
 675                 }
 676
 677                 if (!amdtp_stream_wait_callback(&bebob->tx_stream,
 678                                                 CALLBACK_TIMEOUT)) {
 679                         err = -ETIMEDOUT;
 680                         goto error;
 681                 }
 682         }
 683
 684         return 0;
 685 error:
 686         amdtp_stream_stop(&bebob->tx_stream);
 687         amdtp_stream_stop(&bebob->rx_stream);
 688         break_both_connections(bebob);
 689         return err;
 690 }
 691
 692 void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob)
 693 {
 694         if (bebob->substreams_counter == 0) {
 695                 amdtp_stream_stop(&bebob->rx_stream);
 696                 amdtp_stream_stop(&bebob->tx_stream);
 697
 698                 break_both_connections(bebob);
 699
 700                 cmp_connection_release(&bebob->out_conn);
 701                 cmp_connection_release(&bebob->in_conn);
 702         }
 703 }
 704
 705 /*
 706  * This function should be called before starting streams or after stopping
 707  * streams.
 708  */
 709 void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob)
 710 {
 711         destroy_stream(bebob, &bebob->tx_stream);
 712         destroy_stream(bebob, &bebob->rx_stream);
 713 }
 714
 715 /*
 716  * See: Table 50: Extended Stream Format Info Format Hierarchy Level 2’
 717  * in Additional AVC commands (Nov 2003, BridgeCo)
 718  * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
 719  */
 720 static int
 721 parse_stream_formation(u8 *buf, unsigned int len,
 722                        struct snd_bebob_stream_formation *formation)
 723 {
 724         unsigned int i, e, channels, format;
 725
 726         /*
 727          * this module can support a hierarchy combination that:
 728          *  Root:       Audio and Music (0x90)
 729          *  Level 1:    AM824 Compound  (0x40)
 730          */
 731         if ((buf[0] != 0x90) || (buf[1] != 0x40))
 732                 return -ENOSYS;
 733
 734         /* check sampling rate */
 735         for (i = 0; i < ARRAY_SIZE(bridgeco_freq_table); i++) {
 736                 if (buf[2] == bridgeco_freq_table[i])
 737                         break;
 738         }
 739         if (i == ARRAY_SIZE(bridgeco_freq_table))
 740                 return -ENOSYS;
 741
 742         /* Avoid double count by different entries for the same rate. */
 743         memset(&formation[i], 0, sizeof(struct snd_bebob_stream_formation));
 744
 745         for (e = 0; e < buf[4]; e++) {
 746                 channels = buf[5 + e * 2];
 747                 format = buf[6 + e * 2];
 748
 749                 switch (format) {
 750                 /* IEC 60958 Conformant, currently handled as MBLA */
 751                 case 0x00:
 752                 /* Multi bit linear audio */
 753                 case 0x06:      /* Raw */
 754                         formation[i].pcm += channels;
 755                         break;
 756                 /* MIDI Conformant */
 757                 case 0x0d:
 758                         formation[i].midi += channels;
 759                         break;
 760                 /* IEC 61937-3 to 7 */
 761                 case 0x01:
 762                 case 0x02:
 763                 case 0x03:
 764                 case 0x04:
 765                 case 0x05:
 766                 /* Multi bit linear audio */
 767                 case 0x07:      /* DVD-Audio */
 768                 case 0x0c:      /* High Precision */
 769                 /* One Bit Audio */
 770                 case 0x08:      /* (Plain) Raw */
 771                 case 0x09:      /* (Plain) SACD */
 772                 case 0x0a:      /* (Encoded) Raw */
 773                 case 0x0b:      /* (Encoded) SACD */
 774                 /* Synchronization Stream (Stereo Raw audio) */
 775                 case 0x40:
 776                 /* Don't care */
 777                 case 0xff:
 778                 default:
 779                         return -ENOSYS; /* not supported */
 780                 }
 781         }
 782
 783         if (formation[i].pcm  > AM824_MAX_CHANNELS_FOR_PCM ||
 784             formation[i].midi > AM824_MAX_CHANNELS_FOR_MIDI)
 785                 return -ENOSYS;
 786
 787         return 0;
 788 }
 789
 790 static int
 791 fill_stream_formations(struct snd_bebob *bebob, enum avc_bridgeco_plug_dir dir,
 792                        unsigned short pid)
 793 {
 794         u8 *buf;
 795         struct snd_bebob_stream_formation *formations;
 796         unsigned int len, eid;
 797         u8 addr[AVC_BRIDGECO_ADDR_BYTES];
 798         int err;
 799
 800         buf = kmalloc(FORMAT_MAXIMUM_LENGTH, GFP_KERNEL);
 801         if (buf == NULL)
 802                 return -ENOMEM;
 803
 804         if (dir == AVC_BRIDGECO_PLUG_DIR_IN)
 805                 formations = bebob->rx_stream_formations;
 806         else
 807                 formations = bebob->tx_stream_formations;
 808
 809         for (eid = 0; eid < SND_BEBOB_STRM_FMT_ENTRIES; eid++) {
 810                 len = FORMAT_MAXIMUM_LENGTH;
 811                 avc_bridgeco_fill_unit_addr(addr, dir,
 812                                             AVC_BRIDGECO_PLUG_UNIT_ISOC, pid);
 813                 err = avc_bridgeco_get_plug_strm_fmt(bebob->unit, addr, buf,
 814                                                      &len, eid);
 815                 /* No entries remained. */
 816                 if (err == -EINVAL && eid > 0) {
 817                         err = 0;
 818                         break;
 819                 } else if (err < 0) {
 820                         dev_err(&bebob->unit->device,
 821                         "fail to get stream format %d for isoc %s plug %d:%d\n",
 822                                 eid,
 823                                 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :
 824                                                                     "out",
 825                                 pid, err);
 826                         break;
 827                 }
 828
 829                 err = parse_stream_formation(buf, len, formations);
 830                 if (err < 0)
 831                         break;
 832         }
 833
 834         kfree(buf);
 835         return err;
 836 }
 837
 838 static int
 839 seek_msu_sync_input_plug(struct snd_bebob *bebob)
 840 {
 841         u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
 842         unsigned int i;
 843         enum avc_bridgeco_plug_type type;
 844         int err;
 845
 846         /* Get the number of Music Sub Unit for both direction. */
 847         err = avc_general_get_plug_info(bebob->unit, 0x0c, 0x00, 0x00, plugs);
 848         if (err < 0) {
 849                 dev_err(&bebob->unit->device,
 850                         "fail to get info for MSU in/out plugs: %d\n",
 851                         err);
 852                 goto end;
 853         }
 854
 855         /* seek destination plugs for 'MSU sync input' */
 856         bebob->sync_input_plug = -1;
 857         for (i = 0; i < plugs[0]; i++) {
 858                 avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN, i);
 859                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 860                 if (err < 0) {
 861                         dev_err(&bebob->unit->device,
 862                                 "fail to get type for MSU in plug %d: %d\n",
 863                                 i, err);
 864                         goto end;
 865                 }
 866
 867                 if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
 868                         bebob->sync_input_plug = i;
 869                         break;
 870                 }
 871         }
 872 end:
 873         return err;
 874 }
 875
 876 int snd_bebob_stream_discover(struct snd_bebob *bebob)
 877 {
 878         const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
 879         u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
 880         enum avc_bridgeco_plug_type type;
 881         unsigned int i;
 882         int err;
 883
 884         /* the number of plugs for isoc in/out, ext in/out  */
 885         err = avc_general_get_plug_info(bebob->unit, 0x1f, 0x07, 0x00, plugs);
 886         if (err < 0) {
 887                 dev_err(&bebob->unit->device,
 888                 "fail to get info for isoc/external in/out plugs: %d\n",
 889                         err);
 890                 goto end;
 891         }
 892
 893         /*
 894          * This module supports at least one isoc input plug and one isoc
 895          * output plug.
 896          */
 897         if ((plugs[0] == 0) || (plugs[1] == 0)) {
 898                 err = -ENOSYS;
 899                 goto end;
 900         }
 901
 902         avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
 903                                     AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 904         err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 905         if (err < 0) {
 906                 dev_err(&bebob->unit->device,
 907                         "fail to get type for isoc in plug 0: %d\n", err);
 908                 goto end;
 909         } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
 910                 err = -ENOSYS;
 911                 goto end;
 912         }
 913         err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_IN, 0);
 914         if (err < 0)
 915                 goto end;
 916
 917         avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
 918                                     AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 919         err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 920         if (err < 0) {
 921                 dev_err(&bebob->unit->device,
 922                         "fail to get type for isoc out plug 0: %d\n", err);
 923                 goto end;
 924         } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
 925                 err = -ENOSYS;
 926                 goto end;
 927         }
 928         err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_OUT, 0);
 929         if (err < 0)
 930                 goto end;
 931
 932         /* count external input plugs for MIDI */
 933         bebob->midi_input_ports = 0;
 934         for (i = 0; i < plugs[2]; i++) {
 935                 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
 936                                             AVC_BRIDGECO_PLUG_UNIT_EXT, i);
 937                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 938                 if (err < 0) {
 939                         dev_err(&bebob->unit->device,
 940                         "fail to get type for external in plug %d: %d\n",
 941                                 i, err);
 942                         goto end;
 943                 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
 944                         bebob->midi_input_ports++;
 945                 }
 946         }
 947
 948         /* count external output plugs for MIDI */
 949         bebob->midi_output_ports = 0;
 950         for (i = 0; i < plugs[3]; i++) {
 951                 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
 952                                             AVC_BRIDGECO_PLUG_UNIT_EXT, i);
 953                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 954                 if (err < 0) {
 955                         dev_err(&bebob->unit->device,
 956                         "fail to get type for external out plug %d: %d\n",
 957                                 i, err);
 958                         goto end;
 959                 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
 960                         bebob->midi_output_ports++;
 961                 }
 962         }
 963
 964         /* for check source of clock later */
 965         if (!clk_spec)
 966                 err = seek_msu_sync_input_plug(bebob);
 967 end:
 968         return err;
 969 }
 970
 971 void snd_bebob_stream_lock_changed(struct snd_bebob *bebob)
 972 {
 973         bebob->dev_lock_changed = true;
 974         wake_up(&bebob->hwdep_wait);
 975 }
 976
 977 int snd_bebob_stream_lock_try(struct snd_bebob *bebob)
 978 {
 979         int err;
 980
 981         spin_lock_irq(&bebob->lock);
 982
 983         /* user land lock this */
 984         if (bebob->dev_lock_count < 0) {
 985                 err = -EBUSY;
 986                 goto end;
 987         }
 988
 989         /* this is the first time */
 990         if (bebob->dev_lock_count++ == 0)
 991                 snd_bebob_stream_lock_changed(bebob);
 992         err = 0;
 993 end:
 994         spin_unlock_irq(&bebob->lock);
 995         return err;
 996 }
 997
 998 void snd_bebob_stream_lock_release(struct snd_bebob *bebob)
 999 {
1000         spin_lock_irq(&bebob->lock);
1001
1002         if (WARN_ON(bebob->dev_lock_count <= 0))
1003                 goto end;
1004         if (--bebob->dev_lock_count == 0)
1005                 snd_bebob_stream_lock_changed(bebob);
1006 end:
1007         spin_unlock_irq(&bebob->lock);
1008 }