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_domain_add_stream(&bebob->domain, stream,
 450                                       conn->resources.channel, conn->speed);
 451 end:
 452         return err;
 453 }
 454
 455 static int init_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
 456 {
 457         enum amdtp_stream_direction dir_stream;
 458         struct cmp_connection *conn;
 459         enum cmp_direction dir_conn;
 460         int err;
 461
 462         if (stream == &bebob->tx_stream) {
 463                 dir_stream = AMDTP_IN_STREAM;
 464                 conn = &bebob->out_conn;
 465                 dir_conn = CMP_OUTPUT;
 466         } else {
 467                 dir_stream = AMDTP_OUT_STREAM;
 468                 conn = &bebob->in_conn;
 469                 dir_conn = CMP_INPUT;
 470         }
 471
 472         err = cmp_connection_init(conn, bebob->unit, dir_conn, 0);
 473         if (err < 0)
 474                 return err;
 475
 476         err = amdtp_am824_init(stream, bebob->unit, dir_stream, CIP_BLOCKING);
 477         if (err < 0) {
 478                 cmp_connection_destroy(conn);
 479                 return err;
 480         }
 481
 482         if (stream == &bebob->tx_stream) {
 483                 // BeBoB v3 transfers packets with these qurks:
 484                 //  - In the beginning of streaming, the value of dbc is
 485                 //    incremented even if no data blocks are transferred.
 486                 //  - The value of dbc is reset suddenly.
 487                 if (bebob->version > 2)
 488                         bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC |
 489                                                   CIP_SKIP_DBC_ZERO_CHECK;
 490
 491                 // At high sampling rate, M-Audio special firmware transmits
 492                 // empty packet with the value of dbc incremented by 8 but the
 493                 // others are valid to IEC 61883-1.
 494                 if (bebob->maudio_special_quirk)
 495                         bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC;
 496         }
 497
 498         return 0;
 499 }
 500
 501 static void destroy_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
 502 {
 503         amdtp_stream_destroy(stream);
 504
 505         if (stream == &bebob->tx_stream)
 506                 cmp_connection_destroy(&bebob->out_conn);
 507         else
 508                 cmp_connection_destroy(&bebob->in_conn);
 509 }
 510
 511 int snd_bebob_stream_init_duplex(struct snd_bebob *bebob)
 512 {
 513         int err;
 514
 515         err = init_stream(bebob, &bebob->tx_stream);
 516         if (err < 0)
 517                 return err;
 518
 519         err = init_stream(bebob, &bebob->rx_stream);
 520         if (err < 0) {
 521                 destroy_stream(bebob, &bebob->tx_stream);
 522                 return err;
 523         }
 524
 525         err = amdtp_domain_init(&bebob->domain);
 526         if (err < 0) {
 527                 destroy_stream(bebob, &bebob->tx_stream);
 528                 destroy_stream(bebob, &bebob->rx_stream);
 529         }
 530
 531         return err;
 532 }
 533
 534 static int keep_resources(struct snd_bebob *bebob, struct amdtp_stream *stream,
 535                           unsigned int rate, unsigned int index)
 536 {
 537         struct snd_bebob_stream_formation *formation;
 538         struct cmp_connection *conn;
 539         int err;
 540
 541         if (stream == &bebob->tx_stream) {
 542                 formation = bebob->tx_stream_formations + index;
 543                 conn = &bebob->out_conn;
 544         } else {
 545                 formation = bebob->rx_stream_formations + index;
 546                 conn = &bebob->in_conn;
 547         }
 548
 549         err = amdtp_am824_set_parameters(stream, rate, formation->pcm,
 550                                          formation->midi, false);
 551         if (err < 0)
 552                 return err;
 553
 554         return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream));
 555 }
 556
 557 int snd_bebob_stream_reserve_duplex(struct snd_bebob *bebob, unsigned int rate,
 558                                     unsigned int frames_per_period)
 559 {
 560         unsigned int curr_rate;
 561         int err;
 562
 563         // Considering JACK/FFADO streaming:
 564         // TODO: This can be removed hwdep functionality becomes popular.
 565         err = check_connection_used_by_others(bebob, &bebob->rx_stream);
 566         if (err < 0)
 567                 return err;
 568
 569         err = bebob->spec->rate->get(bebob, &curr_rate);
 570         if (err < 0)
 571                 return err;
 572         if (rate == 0)
 573                 rate = curr_rate;
 574         if (curr_rate != rate) {
 575                 amdtp_domain_stop(&bebob->domain);
 576                 break_both_connections(bebob);
 577
 578                 cmp_connection_release(&bebob->out_conn);
 579                 cmp_connection_release(&bebob->in_conn);
 580         }
 581
 582         if (bebob->substreams_counter == 0 || curr_rate != rate) {
 583                 unsigned int index;
 584
 585                 // NOTE:
 586                 // If establishing connections at first, Yamaha GO46
 587                 // (and maybe Terratec X24) don't generate sound.
 588                 //
 589                 // For firmware customized by M-Audio, refer to next NOTE.
 590                 err = bebob->spec->rate->set(bebob, rate);
 591                 if (err < 0) {
 592                         dev_err(&bebob->unit->device,
 593                                 "fail to set sampling rate: %d\n",
 594                                 err);
 595                         return err;
 596                 }
 597
 598                 err = get_formation_index(rate, &index);
 599                 if (err < 0)
 600                         return err;
 601
 602                 err = keep_resources(bebob, &bebob->tx_stream, rate, index);
 603                 if (err < 0)
 604                         return err;
 605
 606                 err = keep_resources(bebob, &bebob->rx_stream, rate, index);
 607                 if (err < 0) {
 608                         cmp_connection_release(&bebob->out_conn);
 609                         return err;
 610                 }
 611
 612                 err = amdtp_domain_set_events_per_period(&bebob->domain,
 613                                                          frames_per_period, 0);
 614                 if (err < 0) {
 615                         cmp_connection_release(&bebob->out_conn);
 616                         cmp_connection_release(&bebob->in_conn);
 617                         return err;
 618                 }
 619         }
 620
 621         return 0;
 622 }
 623
 624 int snd_bebob_stream_start_duplex(struct snd_bebob *bebob)
 625 {
 626         int err;
 627
 628         // Need no substreams.
 629         if (bebob->substreams_counter == 0)
 630                 return -EIO;
 631
 632         // packet queueing error or detecting discontinuity
 633         if (amdtp_streaming_error(&bebob->rx_stream) ||
 634             amdtp_streaming_error(&bebob->tx_stream)) {
 635                 amdtp_domain_stop(&bebob->domain);
 636                 break_both_connections(bebob);
 637         }
 638
 639         if (!amdtp_stream_running(&bebob->rx_stream)) {
 640                 unsigned int curr_rate;
 641
 642                 if (bebob->maudio_special_quirk) {
 643                         err = bebob->spec->rate->get(bebob, &curr_rate);
 644                         if (err < 0)
 645                                 return err;
 646                 }
 647
 648                 err = make_both_connections(bebob);
 649                 if (err < 0)
 650                         return err;
 651
 652                 err = start_stream(bebob, &bebob->rx_stream);
 653                 if (err < 0)
 654                         goto error;
 655
 656                 err = start_stream(bebob, &bebob->tx_stream);
 657                 if (err < 0)
 658                         goto error;
 659
 660                 err = amdtp_domain_start(&bebob->domain);
 661                 if (err < 0)
 662                         goto error;
 663
 664                 // NOTE:
 665                 // The firmware customized by M-Audio uses these commands to
 666                 // start transmitting stream. This is not usual way.
 667                 if (bebob->maudio_special_quirk) {
 668                         err = bebob->spec->rate->set(bebob, curr_rate);
 669                         if (err < 0) {
 670                                 dev_err(&bebob->unit->device,
 671                                         "fail to ensure sampling rate: %d\n",
 672                                         err);
 673                                 goto error;
 674                         }
 675                 }
 676
 677                 if (!amdtp_stream_wait_callback(&bebob->rx_stream,
 678                                                 CALLBACK_TIMEOUT) ||
 679                     !amdtp_stream_wait_callback(&bebob->tx_stream,
 680                                                 CALLBACK_TIMEOUT)) {
 681                         err = -ETIMEDOUT;
 682                         goto error;
 683                 }
 684         }
 685
 686         return 0;
 687 error:
 688         amdtp_domain_stop(&bebob->domain);
 689         break_both_connections(bebob);
 690         return err;
 691 }
 692
 693 void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob)
 694 {
 695         if (bebob->substreams_counter == 0) {
 696                 amdtp_domain_stop(&bebob->domain);
 697                 break_both_connections(bebob);
 698
 699                 cmp_connection_release(&bebob->out_conn);
 700                 cmp_connection_release(&bebob->in_conn);
 701         }
 702 }
 703
 704 /*
 705  * This function should be called before starting streams or after stopping
 706  * streams.
 707  */
 708 void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob)
 709 {
 710         amdtp_domain_destroy(&bebob->domain);
 711
 712         destroy_stream(bebob, &bebob->tx_stream);
 713         destroy_stream(bebob, &bebob->rx_stream);
 714 }
 715
 716 /*
 717  * See: Table 50: Extended Stream Format Info Format Hierarchy Level 2’
 718  * in Additional AVC commands (Nov 2003, BridgeCo)
 719  * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
 720  */
 721 static int
 722 parse_stream_formation(u8 *buf, unsigned int len,
 723                        struct snd_bebob_stream_formation *formation)
 724 {
 725         unsigned int i, e, channels, format;
 726
 727         /*
 728          * this module can support a hierarchy combination that:
 729          *  Root:       Audio and Music (0x90)
 730          *  Level 1:    AM824 Compound  (0x40)
 731          */
 732         if ((buf[0] != 0x90) || (buf[1] != 0x40))
 733                 return -ENOSYS;
 734
 735         /* check sampling rate */
 736         for (i = 0; i < ARRAY_SIZE(bridgeco_freq_table); i++) {
 737                 if (buf[2] == bridgeco_freq_table[i])
 738                         break;
 739         }
 740         if (i == ARRAY_SIZE(bridgeco_freq_table))
 741                 return -ENOSYS;
 742
 743         /* Avoid double count by different entries for the same rate. */
 744         memset(&formation[i], 0, sizeof(struct snd_bebob_stream_formation));
 745
 746         for (e = 0; e < buf[4]; e++) {
 747                 channels = buf[5 + e * 2];
 748                 format = buf[6 + e * 2];
 749
 750                 switch (format) {
 751                 /* IEC 60958 Conformant, currently handled as MBLA */
 752                 case 0x00:
 753                 /* Multi bit linear audio */
 754                 case 0x06:      /* Raw */
 755                         formation[i].pcm += channels;
 756                         break;
 757                 /* MIDI Conformant */
 758                 case 0x0d:
 759                         formation[i].midi += channels;
 760                         break;
 761                 /* IEC 61937-3 to 7 */
 762                 case 0x01:
 763                 case 0x02:
 764                 case 0x03:
 765                 case 0x04:
 766                 case 0x05:
 767                 /* Multi bit linear audio */
 768                 case 0x07:      /* DVD-Audio */
 769                 case 0x0c:      /* High Precision */
 770                 /* One Bit Audio */
 771                 case 0x08:      /* (Plain) Raw */
 772                 case 0x09:      /* (Plain) SACD */
 773                 case 0x0a:      /* (Encoded) Raw */
 774                 case 0x0b:      /* (Encoded) SACD */
 775                 /* Synchronization Stream (Stereo Raw audio) */
 776                 case 0x40:
 777                 /* Don't care */
 778                 case 0xff:
 779                 default:
 780                         return -ENOSYS; /* not supported */
 781                 }
 782         }
 783
 784         if (formation[i].pcm  > AM824_MAX_CHANNELS_FOR_PCM ||
 785             formation[i].midi > AM824_MAX_CHANNELS_FOR_MIDI)
 786                 return -ENOSYS;
 787
 788         return 0;
 789 }
 790
 791 static int
 792 fill_stream_formations(struct snd_bebob *bebob, enum avc_bridgeco_plug_dir dir,
 793                        unsigned short pid)
 794 {
 795         u8 *buf;
 796         struct snd_bebob_stream_formation *formations;
 797         unsigned int len, eid;
 798         u8 addr[AVC_BRIDGECO_ADDR_BYTES];
 799         int err;
 800
 801         buf = kmalloc(FORMAT_MAXIMUM_LENGTH, GFP_KERNEL);
 802         if (buf == NULL)
 803                 return -ENOMEM;
 804
 805         if (dir == AVC_BRIDGECO_PLUG_DIR_IN)
 806                 formations = bebob->rx_stream_formations;
 807         else
 808                 formations = bebob->tx_stream_formations;
 809
 810         for (eid = 0; eid < SND_BEBOB_STRM_FMT_ENTRIES; eid++) {
 811                 len = FORMAT_MAXIMUM_LENGTH;
 812                 avc_bridgeco_fill_unit_addr(addr, dir,
 813                                             AVC_BRIDGECO_PLUG_UNIT_ISOC, pid);
 814                 err = avc_bridgeco_get_plug_strm_fmt(bebob->unit, addr, buf,
 815                                                      &len, eid);
 816                 /* No entries remained. */
 817                 if (err == -EINVAL && eid > 0) {
 818                         err = 0;
 819                         break;
 820                 } else if (err < 0) {
 821                         dev_err(&bebob->unit->device,
 822                         "fail to get stream format %d for isoc %s plug %d:%d\n",
 823                                 eid,
 824                                 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :
 825                                                                     "out",
 826                                 pid, err);
 827                         break;
 828                 }
 829
 830                 err = parse_stream_formation(buf, len, formations);
 831                 if (err < 0)
 832                         break;
 833         }
 834
 835         kfree(buf);
 836         return err;
 837 }
 838
 839 static int
 840 seek_msu_sync_input_plug(struct snd_bebob *bebob)
 841 {
 842         u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
 843         unsigned int i;
 844         enum avc_bridgeco_plug_type type;
 845         int err;
 846
 847         /* Get the number of Music Sub Unit for both direction. */
 848         err = avc_general_get_plug_info(bebob->unit, 0x0c, 0x00, 0x00, plugs);
 849         if (err < 0) {
 850                 dev_err(&bebob->unit->device,
 851                         "fail to get info for MSU in/out plugs: %d\n",
 852                         err);
 853                 goto end;
 854         }
 855
 856         /* seek destination plugs for 'MSU sync input' */
 857         bebob->sync_input_plug = -1;
 858         for (i = 0; i < plugs[0]; i++) {
 859                 avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN, i);
 860                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 861                 if (err < 0) {
 862                         dev_err(&bebob->unit->device,
 863                                 "fail to get type for MSU in plug %d: %d\n",
 864                                 i, err);
 865                         goto end;
 866                 }
 867
 868                 if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
 869                         bebob->sync_input_plug = i;
 870                         break;
 871                 }
 872         }
 873 end:
 874         return err;
 875 }
 876
 877 int snd_bebob_stream_discover(struct snd_bebob *bebob)
 878 {
 879         const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
 880         u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
 881         enum avc_bridgeco_plug_type type;
 882         unsigned int i;
 883         int err;
 884
 885         /* the number of plugs for isoc in/out, ext in/out  */
 886         err = avc_general_get_plug_info(bebob->unit, 0x1f, 0x07, 0x00, plugs);
 887         if (err < 0) {
 888                 dev_err(&bebob->unit->device,
 889                 "fail to get info for isoc/external in/out plugs: %d\n",
 890                         err);
 891                 goto end;
 892         }
 893
 894         /*
 895          * This module supports at least one isoc input plug and one isoc
 896          * output plug.
 897          */
 898         if ((plugs[0] == 0) || (plugs[1] == 0)) {
 899                 err = -ENOSYS;
 900                 goto end;
 901         }
 902
 903         avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
 904                                     AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 905         err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 906         if (err < 0) {
 907                 dev_err(&bebob->unit->device,
 908                         "fail to get type for isoc in plug 0: %d\n", err);
 909                 goto end;
 910         } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
 911                 err = -ENOSYS;
 912                 goto end;
 913         }
 914         err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_IN, 0);
 915         if (err < 0)
 916                 goto end;
 917
 918         avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
 919                                     AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 920         err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 921         if (err < 0) {
 922                 dev_err(&bebob->unit->device,
 923                         "fail to get type for isoc out plug 0: %d\n", err);
 924                 goto end;
 925         } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
 926                 err = -ENOSYS;
 927                 goto end;
 928         }
 929         err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_OUT, 0);
 930         if (err < 0)
 931                 goto end;
 932
 933         /* count external input plugs for MIDI */
 934         bebob->midi_input_ports = 0;
 935         for (i = 0; i < plugs[2]; i++) {
 936                 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
 937                                             AVC_BRIDGECO_PLUG_UNIT_EXT, i);
 938                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 939                 if (err < 0) {
 940                         dev_err(&bebob->unit->device,
 941                         "fail to get type for external in plug %d: %d\n",
 942                                 i, err);
 943                         goto end;
 944                 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
 945                         bebob->midi_input_ports++;
 946                 }
 947         }
 948
 949         /* count external output plugs for MIDI */
 950         bebob->midi_output_ports = 0;
 951         for (i = 0; i < plugs[3]; i++) {
 952                 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
 953                                             AVC_BRIDGECO_PLUG_UNIT_EXT, i);
 954                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 955                 if (err < 0) {
 956                         dev_err(&bebob->unit->device,
 957                         "fail to get type for external out plug %d: %d\n",
 958                                 i, err);
 959                         goto end;
 960                 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
 961                         bebob->midi_output_ports++;
 962                 }
 963         }
 964
 965         /* for check source of clock later */
 966         if (!clk_spec)
 967                 err = seek_msu_sync_input_plug(bebob);
 968 end:
 969         return err;
 970 }
 971
 972 void snd_bebob_stream_lock_changed(struct snd_bebob *bebob)
 973 {
 974         bebob->dev_lock_changed = true;
 975         wake_up(&bebob->hwdep_wait);
 976 }
 977
 978 int snd_bebob_stream_lock_try(struct snd_bebob *bebob)
 979 {
 980         int err;
 981
 982         spin_lock_irq(&bebob->lock);
 983
 984         /* user land lock this */
 985         if (bebob->dev_lock_count < 0) {
 986                 err = -EBUSY;
 987                 goto end;
 988         }
 989
 990         /* this is the first time */
 991         if (bebob->dev_lock_count++ == 0)
 992                 snd_bebob_stream_lock_changed(bebob);
 993         err = 0;
 994 end:
 995         spin_unlock_irq(&bebob->lock);
 996         return err;
 997 }
 998
 999 void snd_bebob_stream_lock_release(struct snd_bebob *bebob)
1000 {
1001         spin_lock_irq(&bebob->lock);
1002
1003         if (WARN_ON(bebob->dev_lock_count <= 0))
1004                 goto end;
1005         if (--bebob->dev_lock_count == 0)
1006                 snd_bebob_stream_lock_changed(bebob);
1007 end:
1008         spin_unlock_irq(&bebob->lock);
1009 }