sound/firewire/bebob/bebob_stream.c

   1 /*
   2  * bebob_stream.c - a part of driver for BeBoB based devices
   3  *
   4  * Copyright (c) 2013-2014 Takashi Sakamoto
   5  *
   6  * Licensed under the terms of the GNU General Public License, version 2.
   7  */
   8
   9 #include "./bebob.h"
  10
  11 #define CALLBACK_TIMEOUT        1000
  12 #define FW_ISO_RESOURCE_DELAY   1000
  13
  14 /*
  15  * NOTE;
  16  * For BeBoB streams, Both of input and output CMP connection are important.
  17  *
  18  * For most devices, each CMP connection starts to transmit/receive a
  19  * corresponding stream. But for a few devices, both of CMP connection needs
  20  * to start transmitting stream. An example is 'M-Audio Firewire 410'.
  21  */
  22
  23 /* 128 is an arbitrary length but it seems to be enough */
  24 #define FORMAT_MAXIMUM_LENGTH 128
  25
  26 const unsigned int snd_bebob_rate_table[SND_BEBOB_STRM_FMT_ENTRIES] = {
  27         [0] = 32000,
  28         [1] = 44100,
  29         [2] = 48000,
  30         [3] = 88200,
  31         [4] = 96000,
  32         [5] = 176400,
  33         [6] = 192000,
  34 };
  35
  36 /*
  37  * See: Table 51: Extended Stream Format Info ‘Sampling Frequency’
  38  * in Additional AVC commands (Nov 2003, BridgeCo)
  39  */
  40 static const unsigned int bridgeco_freq_table[] = {
  41         [0] = 0x02,
  42         [1] = 0x03,
  43         [2] = 0x04,
  44         [3] = 0x0a,
  45         [4] = 0x05,
  46         [5] = 0x06,
  47         [6] = 0x07,
  48 };
  49
  50 static unsigned int
  51 get_formation_index(unsigned int rate)
  52 {
  53         unsigned int i;
  54
  55         for (i = 0; i < ARRAY_SIZE(snd_bebob_rate_table); i++) {
  56                 if (snd_bebob_rate_table[i] == rate)
  57                         return i;
  58         }
  59         return -EINVAL;
  60 }
  61
  62 int
  63 snd_bebob_stream_get_rate(struct snd_bebob *bebob, unsigned int *curr_rate)
  64 {
  65         unsigned int tx_rate, rx_rate, trials;
  66         int err;
  67
  68         trials = 0;
  69         do {
  70                 err = avc_general_get_sig_fmt(bebob->unit, &tx_rate,
  71                                               AVC_GENERAL_PLUG_DIR_OUT, 0);
  72         } while (err == -EAGAIN && ++trials < 3);
  73         if (err < 0)
  74                 goto end;
  75
  76         trials = 0;
  77         do {
  78                 err = avc_general_get_sig_fmt(bebob->unit, &rx_rate,
  79                                               AVC_GENERAL_PLUG_DIR_IN, 0);
  80         } while (err == -EAGAIN && ++trials < 3);
  81         if (err < 0)
  82                 goto end;
  83
  84         *curr_rate = rx_rate;
  85         if (rx_rate == tx_rate)
  86                 goto end;
  87
  88         /* synchronize receive stream rate to transmit stream rate */
  89         err = avc_general_set_sig_fmt(bebob->unit, rx_rate,
  90                                       AVC_GENERAL_PLUG_DIR_IN, 0);
  91 end:
  92         return err;
  93 }
  94
  95 int
  96 snd_bebob_stream_set_rate(struct snd_bebob *bebob, unsigned int rate)
  97 {
  98         int err;
  99
 100         err = avc_general_set_sig_fmt(bebob->unit, rate,
 101                                       AVC_GENERAL_PLUG_DIR_OUT, 0);
 102         if (err < 0)
 103                 goto end;
 104
 105         err = avc_general_set_sig_fmt(bebob->unit, rate,
 106                                       AVC_GENERAL_PLUG_DIR_IN, 0);
 107         if (err < 0)
 108                 goto end;
 109
 110         /*
 111          * Some devices need a bit time for transition.
 112          * 300msec is got by some experiments.
 113          */
 114         msleep(300);
 115 end:
 116         return err;
 117 }
 118
 119 int
 120 snd_bebob_stream_check_internal_clock(struct snd_bebob *bebob, bool *internal)
 121 {
 122         struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
 123         u8 addr[AVC_BRIDGECO_ADDR_BYTES], input[7];
 124         unsigned int id;
 125         int err = 0;
 126
 127         *internal = false;
 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                 else if (strncmp(clk_spec->labels[id], SND_BEBOB_CLOCK_INTERNAL,
 136                                  strlen(SND_BEBOB_CLOCK_INTERNAL)) == 0)
 137                         *internal = true;
 138                 goto end;
 139         }
 140
 141         /*
 142          * 2.The device don't support to switch source of clock then assumed
 143          *   to use internal clock always
 144          */
 145         if (bebob->sync_input_plug < 0) {
 146                 *internal = true;
 147                 goto end;
 148         }
 149
 150         /*
 151          * 3.The device supports to switch source of clock by an usual way.
 152          *   Let's check input for 'Music Sub Unit Sync Input' plug.
 153          */
 154         avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
 155                                    bebob->sync_input_plug);
 156         err = avc_bridgeco_get_plug_input(bebob->unit, addr, input);
 157         if (err < 0) {
 158                 dev_err(&bebob->unit->device,
 159                         "fail to get an input for MSU in plug %d: %d\n",
 160                         bebob->sync_input_plug, err);
 161                 goto end;
 162         }
 163
 164         /*
 165          * If there are no input plugs, all of fields are 0xff.
 166          * Here check the first field. This field is used for direction.
 167          */
 168         if (input[0] == 0xff) {
 169                 *internal = true;
 170                 goto end;
 171         }
 172
 173         /*
 174          * If source of clock is internal CSR, Music Sub Unit Sync Input is
 175          * a destination of Music Sub Unit Sync Output.
 176          */
 177         *internal = ((input[0] == AVC_BRIDGECO_PLUG_DIR_OUT) &&
 178                      (input[1] == AVC_BRIDGECO_PLUG_MODE_SUBUNIT) &&
 179                      (input[2] == 0x0c) &&
 180                      (input[3] == 0x00));
 181 end:
 182         return err;
 183 }
 184
 185 static unsigned int
 186 map_data_channels(struct snd_bebob *bebob, struct amdtp_stream *s)
 187 {
 188         unsigned int sec, sections, ch, channels;
 189         unsigned int pcm, midi, location;
 190         unsigned int stm_pos, sec_loc, pos;
 191         u8 *buf, addr[AVC_BRIDGECO_ADDR_BYTES], type;
 192         enum avc_bridgeco_plug_dir dir;
 193         int err;
 194
 195         /*
 196          * The length of return value of this command cannot be expected. Here
 197          * use the maximum length of FCP.
 198          */
 199         buf = kzalloc(256, GFP_KERNEL);
 200         if (buf == NULL)
 201                 return -ENOMEM;
 202
 203         if (s == &bebob->tx_stream)
 204                 dir = AVC_BRIDGECO_PLUG_DIR_OUT;
 205         else
 206                 dir = AVC_BRIDGECO_PLUG_DIR_IN;
 207
 208         avc_bridgeco_fill_unit_addr(addr, dir, AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 209         err = avc_bridgeco_get_plug_ch_pos(bebob->unit, addr, buf, 256);
 210         if (err < 0) {
 211                 dev_err(&bebob->unit->device,
 212                         "fail to get channel position for isoc %s plug 0: %d\n",
 213                         (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" : "out",
 214                         err);
 215                 goto end;
 216         }
 217         pos = 0;
 218
 219         /* positions in I/O buffer */
 220         pcm = 0;
 221         midi = 0;
 222
 223         /* the number of sections in AMDTP packet */
 224         sections = buf[pos++];
 225
 226         for (sec = 0; sec < sections; sec++) {
 227                 /* type of this section */
 228                 avc_bridgeco_fill_unit_addr(addr, dir,
 229                                             AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 230                 err = avc_bridgeco_get_plug_section_type(bebob->unit, addr,
 231                                                          sec, &type);
 232                 if (err < 0) {
 233                         dev_err(&bebob->unit->device,
 234                         "fail to get section type for isoc %s plug 0: %d\n",
 235                                 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :
 236                                                                     "out",
 237                                 err);
 238                         goto end;
 239                 }
 240                 /* NoType */
 241                 if (type == 0xff) {
 242                         err = -ENOSYS;
 243                         goto end;
 244                 }
 245
 246                 /* the number of channels in this section */
 247                 channels = buf[pos++];
 248
 249                 for (ch = 0; ch < channels; ch++) {
 250                         /* position of this channel in AMDTP packet */
 251                         stm_pos = buf[pos++] - 1;
 252                         /* location of this channel in this section */
 253                         sec_loc = buf[pos++] - 1;
 254
 255                         /*
 256                          * Basically the number of location is within the
 257                          * number of channels in this section. But some models
 258                          * of M-Audio don't follow this. Its location for MIDI
 259                          * is the position of MIDI channels in AMDTP packet.
 260                          */
 261                         if (sec_loc >= channels)
 262                                 sec_loc = ch;
 263
 264                         switch (type) {
 265                         /* for MIDI conformant data channel */
 266                         case 0x0a:
 267                                 /* AMDTP_MAX_CHANNELS_FOR_MIDI is 1. */
 268                                 if ((midi > 0) && (stm_pos != midi)) {
 269                                         err = -ENOSYS;
 270                                         goto end;
 271                                 }
 272                                 s->midi_position = stm_pos;
 273                                 midi = stm_pos;
 274                                 break;
 275                         /* for PCM data channel */
 276                         case 0x01:      /* Headphone */
 277                         case 0x02:      /* Microphone */
 278                         case 0x03:      /* Line */
 279                         case 0x04:      /* SPDIF */
 280                         case 0x05:      /* ADAT */
 281                         case 0x06:      /* TDIF */
 282                         case 0x07:      /* MADI */
 283                         /* for undefined/changeable signal  */
 284                         case 0x08:      /* Analog */
 285                         case 0x09:      /* Digital */
 286                         default:
 287                                 location = pcm + sec_loc;
 288                                 if (location >= AMDTP_MAX_CHANNELS_FOR_PCM) {
 289                                         err = -ENOSYS;
 290                                         goto end;
 291                                 }
 292                                 s->pcm_positions[location] = stm_pos;
 293                                 break;
 294                         }
 295                 }
 296
 297                 if (type != 0x0a)
 298                         pcm += channels;
 299                 else
 300                         midi += channels;
 301         }
 302 end:
 303         kfree(buf);
 304         return err;
 305 }
 306
 307 static int
 308 init_both_connections(struct snd_bebob *bebob)
 309 {
 310         int err;
 311
 312         err = cmp_connection_init(&bebob->in_conn,
 313                                   bebob->unit, CMP_INPUT, 0);
 314         if (err < 0)
 315                 goto end;
 316
 317         err = cmp_connection_init(&bebob->out_conn,
 318                                   bebob->unit, CMP_OUTPUT, 0);
 319         if (err < 0)
 320                 cmp_connection_destroy(&bebob->in_conn);
 321 end:
 322         return err;
 323 }
 324
 325 static int
 326 check_connection_used_by_others(struct snd_bebob *bebob, struct amdtp_stream *s)
 327 {
 328         struct cmp_connection *conn;
 329         bool used;
 330         int err;
 331
 332         if (s == &bebob->tx_stream)
 333                 conn = &bebob->out_conn;
 334         else
 335                 conn = &bebob->in_conn;
 336
 337         err = cmp_connection_check_used(conn, &used);
 338         if ((err >= 0) && used && !amdtp_stream_running(s)) {
 339                 dev_err(&bebob->unit->device,
 340                         "Connection established by others: %cPCR[%d]\n",
 341                         (conn->direction == CMP_OUTPUT) ? 'o' : 'i',
 342                         conn->pcr_index);
 343                 err = -EBUSY;
 344         }
 345
 346         return err;
 347 }
 348
 349 static int
 350 make_both_connections(struct snd_bebob *bebob, unsigned int rate)
 351 {
 352         int index, pcm_channels, midi_channels, err = 0;
 353
 354         if (bebob->connected)
 355                 goto end;
 356
 357         /* confirm params for both streams */
 358         index = get_formation_index(rate);
 359         pcm_channels = bebob->tx_stream_formations[index].pcm;
 360         midi_channels = bebob->tx_stream_formations[index].midi;
 361         amdtp_stream_set_parameters(&bebob->tx_stream,
 362                                     rate, pcm_channels, midi_channels * 8);
 363         pcm_channels = bebob->rx_stream_formations[index].pcm;
 364         midi_channels = bebob->rx_stream_formations[index].midi;
 365         amdtp_stream_set_parameters(&bebob->rx_stream,
 366                                     rate, pcm_channels, midi_channels * 8);
 367
 368         /* establish connections for both streams */
 369         err = cmp_connection_establish(&bebob->out_conn,
 370                         amdtp_stream_get_max_payload(&bebob->tx_stream));
 371         if (err < 0)
 372                 goto end;
 373         err = cmp_connection_establish(&bebob->in_conn,
 374                         amdtp_stream_get_max_payload(&bebob->rx_stream));
 375         if (err < 0) {
 376                 cmp_connection_break(&bebob->out_conn);
 377                 goto end;
 378         }
 379
 380         bebob->connected = true;
 381 end:
 382         return err;
 383 }
 384
 385 static void
 386 break_both_connections(struct snd_bebob *bebob)
 387 {
 388         cmp_connection_break(&bebob->in_conn);
 389         cmp_connection_break(&bebob->out_conn);
 390
 391         bebob->connected = false;
 392
 393         /* These models seems to be in transition state for a longer time. */
 394         if (bebob->maudio_special_quirk != NULL)
 395                 msleep(200);
 396 }
 397
 398 static void
 399 destroy_both_connections(struct snd_bebob *bebob)
 400 {
 401         break_both_connections(bebob);
 402
 403         cmp_connection_destroy(&bebob->in_conn);
 404         cmp_connection_destroy(&bebob->out_conn);
 405 }
 406
 407 static int
 408 get_sync_mode(struct snd_bebob *bebob, enum cip_flags *sync_mode)
 409 {
 410         /* currently this module doesn't support SYT-Match mode */
 411         *sync_mode = CIP_SYNC_TO_DEVICE;
 412         return 0;
 413 }
 414
 415 static int
 416 start_stream(struct snd_bebob *bebob, struct amdtp_stream *stream,
 417              unsigned int rate)
 418 {
 419         struct cmp_connection *conn;
 420         int err = 0;
 421
 422         if (stream == &bebob->rx_stream)
 423                 conn = &bebob->in_conn;
 424         else
 425                 conn = &bebob->out_conn;
 426
 427         /* channel mapping */
 428         if (bebob->maudio_special_quirk == NULL) {
 429                 err = map_data_channels(bebob, stream);
 430                 if (err < 0)
 431                         goto end;
 432         }
 433
 434         /* start amdtp stream */
 435         err = amdtp_stream_start(stream,
 436                                  conn->resources.channel,
 437                                  conn->speed);
 438 end:
 439         return err;
 440 }
 441
 442 int snd_bebob_stream_init_duplex(struct snd_bebob *bebob)
 443 {
 444         int err;
 445
 446         err = init_both_connections(bebob);
 447         if (err < 0)
 448                 goto end;
 449
 450         err = amdtp_stream_init(&bebob->tx_stream, bebob->unit,
 451                                 AMDTP_IN_STREAM, CIP_BLOCKING);
 452         if (err < 0) {
 453                 amdtp_stream_destroy(&bebob->tx_stream);
 454                 destroy_both_connections(bebob);
 455                 goto end;
 456         }
 457         /* See comments in next function */
 458         init_completion(&bebob->bus_reset);
 459         bebob->tx_stream.flags |= CIP_SKIP_INIT_DBC_CHECK;
 460         /*
 461          * At high sampling rate, M-Audio special firmware transmits empty
 462          * packet with the value of dbc incremented by 8 but the others are
 463          * valid to IEC 61883-1.
 464          */
 465         if (bebob->maudio_special_quirk)
 466                 bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC;
 467
 468         err = amdtp_stream_init(&bebob->rx_stream, bebob->unit,
 469                                 AMDTP_OUT_STREAM, CIP_BLOCKING);
 470         if (err < 0) {
 471                 amdtp_stream_destroy(&bebob->tx_stream);
 472                 amdtp_stream_destroy(&bebob->rx_stream);
 473                 destroy_both_connections(bebob);
 474         }
 475         /*
 476          * The firmware for these devices ignore MIDI messages in more than
 477          * first 8 data blocks of an received AMDTP packet.
 478          */
 479         if (bebob->spec == &maudio_fw410_spec ||
 480             bebob->spec == &maudio_special_spec)
 481                 bebob->rx_stream.rx_blocks_for_midi = 8;
 482 end:
 483         return err;
 484 }
 485
 486 int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, unsigned int rate)
 487 {
 488         struct snd_bebob_rate_spec *rate_spec = bebob->spec->rate;
 489         struct amdtp_stream *master, *slave;
 490         atomic_t *slave_substreams;
 491         enum cip_flags sync_mode;
 492         unsigned int curr_rate;
 493         bool updated = false;
 494         int err = 0;
 495
 496         /*
 497          * Normal BeBoB firmware has a quirk at bus reset to transmits packets
 498          * with discontinuous value in dbc field.
 499          *
 500          * This 'struct completion' is used to call .update() at first to update
 501          * connections/streams. Next following codes handle streaming error.
 502          */
 503         if (amdtp_streaming_error(&bebob->tx_stream)) {
 504                 if (completion_done(&bebob->bus_reset))
 505                         reinit_completion(&bebob->bus_reset);
 506
 507                 updated = (wait_for_completion_interruptible_timeout(
 508                                 &bebob->bus_reset,
 509                                 msecs_to_jiffies(FW_ISO_RESOURCE_DELAY)) > 0);
 510         }
 511
 512         mutex_lock(&bebob->mutex);
 513
 514         /* Need no substreams */
 515         if (atomic_read(&bebob->playback_substreams) == 0 &&
 516             atomic_read(&bebob->capture_substreams)  == 0)
 517                 goto end;
 518
 519         err = get_sync_mode(bebob, &sync_mode);
 520         if (err < 0)
 521                 goto end;
 522         if (sync_mode == CIP_SYNC_TO_DEVICE) {
 523                 master = &bebob->tx_stream;
 524                 slave  = &bebob->rx_stream;
 525                 slave_substreams = &bebob->playback_substreams;
 526         } else {
 527                 master = &bebob->rx_stream;
 528                 slave  = &bebob->tx_stream;
 529                 slave_substreams = &bebob->capture_substreams;
 530         }
 531
 532         /*
 533          * Considering JACK/FFADO streaming:
 534          * TODO: This can be removed hwdep functionality becomes popular.
 535          */
 536         err = check_connection_used_by_others(bebob, master);
 537         if (err < 0)
 538                 goto end;
 539
 540         /*
 541          * packet queueing error or detecting discontinuity
 542          *
 543          * At bus reset, connections should not be broken here. So streams need
 544          * to be re-started. This is a reason to use SKIP_INIT_DBC_CHECK flag.
 545          */
 546         if (amdtp_streaming_error(master))
 547                 amdtp_stream_stop(master);
 548         if (amdtp_streaming_error(slave))
 549                 amdtp_stream_stop(slave);
 550         if (!updated &&
 551             !amdtp_stream_running(master) && !amdtp_stream_running(slave))
 552                 break_both_connections(bebob);
 553
 554         /* stop streams if rate is different */
 555         err = rate_spec->get(bebob, &curr_rate);
 556         if (err < 0) {
 557                 dev_err(&bebob->unit->device,
 558                         "fail to get sampling rate: %d\n", err);
 559                 goto end;
 560         }
 561         if (rate == 0)
 562                 rate = curr_rate;
 563         if (rate != curr_rate) {
 564                 amdtp_stream_stop(master);
 565                 amdtp_stream_stop(slave);
 566                 break_both_connections(bebob);
 567         }
 568
 569         /* master should be always running */
 570         if (!amdtp_stream_running(master)) {
 571                 amdtp_stream_set_sync(sync_mode, master, slave);
 572                 bebob->master = master;
 573
 574                 /*
 575                  * NOTE:
 576                  * If establishing connections at first, Yamaha GO46
 577                  * (and maybe Terratec X24) don't generate sound.
 578                  *
 579                  * For firmware customized by M-Audio, refer to next NOTE.
 580                  */
 581                 if (bebob->maudio_special_quirk == NULL) {
 582                         err = rate_spec->set(bebob, rate);
 583                         if (err < 0) {
 584                                 dev_err(&bebob->unit->device,
 585                                         "fail to set sampling rate: %d\n",
 586                                         err);
 587                                 goto end;
 588                         }
 589                 }
 590
 591                 err = make_both_connections(bebob, rate);
 592                 if (err < 0)
 593                         goto end;
 594
 595                 err = start_stream(bebob, master, rate);
 596                 if (err < 0) {
 597                         dev_err(&bebob->unit->device,
 598                                 "fail to run AMDTP master stream:%d\n", err);
 599                         break_both_connections(bebob);
 600                         goto end;
 601                 }
 602
 603                 /*
 604                  * NOTE:
 605                  * The firmware customized by M-Audio uses these commands to
 606                  * start transmitting stream. This is not usual way.
 607                  */
 608                 if (bebob->maudio_special_quirk != NULL) {
 609                         err = rate_spec->set(bebob, rate);
 610                         if (err < 0) {
 611                                 dev_err(&bebob->unit->device,
 612                                         "fail to ensure sampling rate: %d\n",
 613                                         err);
 614                                 amdtp_stream_stop(master);
 615                                 break_both_connections(bebob);
 616                                 goto end;
 617                         }
 618                 }
 619
 620                 /* wait first callback */
 621                 if (!amdtp_stream_wait_callback(master, CALLBACK_TIMEOUT)) {
 622                         amdtp_stream_stop(master);
 623                         break_both_connections(bebob);
 624                         err = -ETIMEDOUT;
 625                         goto end;
 626                 }
 627         }
 628
 629         /* start slave if needed */
 630         if (atomic_read(slave_substreams) > 0 && !amdtp_stream_running(slave)) {
 631                 err = start_stream(bebob, slave, rate);
 632                 if (err < 0) {
 633                         dev_err(&bebob->unit->device,
 634                                 "fail to run AMDTP slave stream:%d\n", err);
 635                         amdtp_stream_stop(master);
 636                         break_both_connections(bebob);
 637                         goto end;
 638                 }
 639
 640                 /* wait first callback */
 641                 if (!amdtp_stream_wait_callback(slave, CALLBACK_TIMEOUT)) {
 642                         amdtp_stream_stop(slave);
 643                         amdtp_stream_stop(master);
 644                         break_both_connections(bebob);
 645                         err = -ETIMEDOUT;
 646                 }
 647         }
 648 end:
 649         mutex_unlock(&bebob->mutex);
 650         return err;
 651 }
 652
 653 void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob)
 654 {
 655         struct amdtp_stream *master, *slave;
 656         atomic_t *master_substreams, *slave_substreams;
 657
 658         if (bebob->master == &bebob->rx_stream) {
 659                 slave  = &bebob->tx_stream;
 660                 master = &bebob->rx_stream;
 661                 slave_substreams  = &bebob->capture_substreams;
 662                 master_substreams = &bebob->playback_substreams;
 663         } else {
 664                 slave  = &bebob->rx_stream;
 665                 master = &bebob->tx_stream;
 666                 slave_substreams  = &bebob->playback_substreams;
 667                 master_substreams = &bebob->capture_substreams;
 668         }
 669
 670         mutex_lock(&bebob->mutex);
 671
 672         if (atomic_read(slave_substreams) == 0) {
 673                 amdtp_stream_pcm_abort(slave);
 674                 amdtp_stream_stop(slave);
 675
 676                 if (atomic_read(master_substreams) == 0) {
 677                         amdtp_stream_pcm_abort(master);
 678                         amdtp_stream_stop(master);
 679                         break_both_connections(bebob);
 680                 }
 681         }
 682
 683         mutex_unlock(&bebob->mutex);
 684 }
 685
 686 void snd_bebob_stream_update_duplex(struct snd_bebob *bebob)
 687 {
 688         /* vs. XRUN recovery due to discontinuity at bus reset */
 689         mutex_lock(&bebob->mutex);
 690
 691         if ((cmp_connection_update(&bebob->in_conn) < 0) ||
 692             (cmp_connection_update(&bebob->out_conn) < 0)) {
 693                 amdtp_stream_pcm_abort(&bebob->rx_stream);
 694                 amdtp_stream_pcm_abort(&bebob->tx_stream);
 695                 amdtp_stream_stop(&bebob->rx_stream);
 696                 amdtp_stream_stop(&bebob->tx_stream);
 697                 break_both_connections(bebob);
 698         } else {
 699                 amdtp_stream_update(&bebob->rx_stream);
 700                 amdtp_stream_update(&bebob->tx_stream);
 701         }
 702
 703         /* wake up stream_start_duplex() */
 704         if (!completion_done(&bebob->bus_reset))
 705                 complete_all(&bebob->bus_reset);
 706
 707         mutex_unlock(&bebob->mutex);
 708 }
 709
 710 void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob)
 711 {
 712         mutex_lock(&bebob->mutex);
 713
 714         amdtp_stream_pcm_abort(&bebob->rx_stream);
 715         amdtp_stream_pcm_abort(&bebob->tx_stream);
 716
 717         amdtp_stream_stop(&bebob->rx_stream);
 718         amdtp_stream_stop(&bebob->tx_stream);
 719
 720         amdtp_stream_destroy(&bebob->rx_stream);
 721         amdtp_stream_destroy(&bebob->tx_stream);
 722
 723         destroy_both_connections(bebob);
 724
 725         mutex_unlock(&bebob->mutex);
 726 }
 727
 728 /*
 729  * See: Table 50: Extended Stream Format Info Format Hierarchy Level 2’
 730  * in Additional AVC commands (Nov 2003, BridgeCo)
 731  * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
 732  */
 733 static int
 734 parse_stream_formation(u8 *buf, unsigned int len,
 735                        struct snd_bebob_stream_formation *formation)
 736 {
 737         unsigned int i, e, channels, format;
 738
 739         /*
 740          * this module can support a hierarchy combination that:
 741          *  Root:       Audio and Music (0x90)
 742          *  Level 1:    AM824 Compound  (0x40)
 743          */
 744         if ((buf[0] != 0x90) || (buf[1] != 0x40))
 745                 return -ENOSYS;
 746
 747         /* check sampling rate */
 748         for (i = 0; i < ARRAY_SIZE(bridgeco_freq_table); i++) {
 749                 if (buf[2] == bridgeco_freq_table[i])
 750                         break;
 751         }
 752         if (i == ARRAY_SIZE(bridgeco_freq_table))
 753                 return -ENOSYS;
 754
 755         /* Avoid double count by different entries for the same rate. */
 756         memset(&formation[i], 0, sizeof(struct snd_bebob_stream_formation));
 757
 758         for (e = 0; e < buf[4]; e++) {
 759                 channels = buf[5 + e * 2];
 760                 format = buf[6 + e * 2];
 761
 762                 switch (format) {
 763                 /* IEC 60958 Conformant, currently handled as MBLA */
 764                 case 0x00:
 765                 /* Multi bit linear audio */
 766                 case 0x06:      /* Raw */
 767                         formation[i].pcm += channels;
 768                         break;
 769                 /* MIDI Conformant */
 770                 case 0x0d:
 771                         formation[i].midi += channels;
 772                         break;
 773                 /* IEC 61937-3 to 7 */
 774                 case 0x01:
 775                 case 0x02:
 776                 case 0x03:
 777                 case 0x04:
 778                 case 0x05:
 779                 /* Multi bit linear audio */
 780                 case 0x07:      /* DVD-Audio */
 781                 case 0x0c:      /* High Precision */
 782                 /* One Bit Audio */
 783                 case 0x08:      /* (Plain) Raw */
 784                 case 0x09:      /* (Plain) SACD */
 785                 case 0x0a:      /* (Encoded) Raw */
 786                 case 0x0b:      /* (Encoded) SACD */
 787                 /* Synchronization Stream (Stereo Raw audio) */
 788                 case 0x40:
 789                 /* Don't care */
 790                 case 0xff:
 791                 default:
 792                         return -ENOSYS; /* not supported */
 793                 }
 794         }
 795
 796         if (formation[i].pcm  > AMDTP_MAX_CHANNELS_FOR_PCM ||
 797             formation[i].midi > AMDTP_MAX_CHANNELS_FOR_MIDI)
 798                 return -ENOSYS;
 799
 800         return 0;
 801 }
 802
 803 static int
 804 fill_stream_formations(struct snd_bebob *bebob, enum avc_bridgeco_plug_dir dir,
 805                        unsigned short pid)
 806 {
 807         u8 *buf;
 808         struct snd_bebob_stream_formation *formations;
 809         unsigned int len, eid;
 810         u8 addr[AVC_BRIDGECO_ADDR_BYTES];
 811         int err;
 812
 813         buf = kmalloc(FORMAT_MAXIMUM_LENGTH, GFP_KERNEL);
 814         if (buf == NULL)
 815                 return -ENOMEM;
 816
 817         if (dir == AVC_BRIDGECO_PLUG_DIR_IN)
 818                 formations = bebob->rx_stream_formations;
 819         else
 820                 formations = bebob->tx_stream_formations;
 821
 822         for (eid = 0; eid < SND_BEBOB_STRM_FMT_ENTRIES; eid++) {
 823                 len = FORMAT_MAXIMUM_LENGTH;
 824                 avc_bridgeco_fill_unit_addr(addr, dir,
 825                                             AVC_BRIDGECO_PLUG_UNIT_ISOC, pid);
 826                 err = avc_bridgeco_get_plug_strm_fmt(bebob->unit, addr, buf,
 827                                                      &len, eid);
 828                 /* No entries remained. */
 829                 if (err == -EINVAL && eid > 0) {
 830                         err = 0;
 831                         break;
 832                 } else if (err < 0) {
 833                         dev_err(&bebob->unit->device,
 834                         "fail to get stream format %d for isoc %s plug %d:%d\n",
 835                                 eid,
 836                                 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :
 837                                                                     "out",
 838                                 pid, err);
 839                         break;
 840                 }
 841
 842                 err = parse_stream_formation(buf, len, formations);
 843                 if (err < 0)
 844                         break;
 845         }
 846
 847         kfree(buf);
 848         return err;
 849 }
 850
 851 static int
 852 seek_msu_sync_input_plug(struct snd_bebob *bebob)
 853 {
 854         u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
 855         unsigned int i;
 856         enum avc_bridgeco_plug_type type;
 857         int err;
 858
 859         /* Get the number of Music Sub Unit for both direction. */
 860         err = avc_general_get_plug_info(bebob->unit, 0x0c, 0x00, 0x00, plugs);
 861         if (err < 0) {
 862                 dev_err(&bebob->unit->device,
 863                         "fail to get info for MSU in/out plugs: %d\n",
 864                         err);
 865                 goto end;
 866         }
 867
 868         /* seek destination plugs for 'MSU sync input' */
 869         bebob->sync_input_plug = -1;
 870         for (i = 0; i < plugs[0]; i++) {
 871                 avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN, i);
 872                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 873                 if (err < 0) {
 874                         dev_err(&bebob->unit->device,
 875                                 "fail to get type for MSU in plug %d: %d\n",
 876                                 i, err);
 877                         goto end;
 878                 }
 879
 880                 if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
 881                         bebob->sync_input_plug = i;
 882                         break;
 883                 }
 884         }
 885 end:
 886         return err;
 887 }
 888
 889 int snd_bebob_stream_discover(struct snd_bebob *bebob)
 890 {
 891         struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
 892         u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
 893         enum avc_bridgeco_plug_type type;
 894         unsigned int i;
 895         int err;
 896
 897         /* the number of plugs for isoc in/out, ext in/out  */
 898         err = avc_general_get_plug_info(bebob->unit, 0x1f, 0x07, 0x00, plugs);
 899         if (err < 0) {
 900                 dev_err(&bebob->unit->device,
 901                 "fail to get info for isoc/external in/out plugs: %d\n",
 902                         err);
 903                 goto end;
 904         }
 905
 906         /*
 907          * This module supports at least one isoc input plug and one isoc
 908          * output plug.
 909          */
 910         if ((plugs[0] == 0) || (plugs[1] == 0)) {
 911                 err = -ENOSYS;
 912                 goto end;
 913         }
 914
 915         avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
 916                                     AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 917         err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 918         if (err < 0) {
 919                 dev_err(&bebob->unit->device,
 920                         "fail to get type for isoc in plug 0: %d\n", err);
 921                 goto end;
 922         } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
 923                 err = -ENOSYS;
 924                 goto end;
 925         }
 926         err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_IN, 0);
 927         if (err < 0)
 928                 goto end;
 929
 930         avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
 931                                     AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 932         err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 933         if (err < 0) {
 934                 dev_err(&bebob->unit->device,
 935                         "fail to get type for isoc out plug 0: %d\n", err);
 936                 goto end;
 937         } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
 938                 err = -ENOSYS;
 939                 goto end;
 940         }
 941         err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_OUT, 0);
 942         if (err < 0)
 943                 goto end;
 944
 945         /* count external input plugs for MIDI */
 946         bebob->midi_input_ports = 0;
 947         for (i = 0; i < plugs[2]; i++) {
 948                 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
 949                                             AVC_BRIDGECO_PLUG_UNIT_EXT, i);
 950                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 951                 if (err < 0) {
 952                         dev_err(&bebob->unit->device,
 953                         "fail to get type for external in plug %d: %d\n",
 954                                 i, err);
 955                         goto end;
 956                 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
 957                         bebob->midi_input_ports++;
 958                 }
 959         }
 960
 961         /* count external output plugs for MIDI */
 962         bebob->midi_output_ports = 0;
 963         for (i = 0; i < plugs[3]; i++) {
 964                 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
 965                                             AVC_BRIDGECO_PLUG_UNIT_EXT, i);
 966                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 967                 if (err < 0) {
 968                         dev_err(&bebob->unit->device,
 969                         "fail to get type for external out plug %d: %d\n",
 970                                 i, err);
 971                         goto end;
 972                 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
 973                         bebob->midi_output_ports++;
 974                 }
 975         }
 976
 977         /* for check source of clock later */
 978         if (!clk_spec)
 979                 err = seek_msu_sync_input_plug(bebob);
 980 end:
 981         return err;
 982 }
 983
 984 void snd_bebob_stream_lock_changed(struct snd_bebob *bebob)
 985 {
 986         bebob->dev_lock_changed = true;
 987         wake_up(&bebob->hwdep_wait);
 988 }
 989
 990 int snd_bebob_stream_lock_try(struct snd_bebob *bebob)
 991 {
 992         int err;
 993
 994         spin_lock_irq(&bebob->lock);
 995
 996         /* user land lock this */
 997         if (bebob->dev_lock_count < 0) {
 998                 err = -EBUSY;
 999                 goto end;
1000         }
1001
1002         /* this is the first time */
1003         if (bebob->dev_lock_count++ == 0)
1004                 snd_bebob_stream_lock_changed(bebob);
1005         err = 0;
1006 end:
1007         spin_unlock_irq(&bebob->lock);
1008         return err;
1009 }
1010
1011 void snd_bebob_stream_lock_release(struct snd_bebob *bebob)
1012 {
1013         spin_lock_irq(&bebob->lock);
1014
1015         if (WARN_ON(bebob->dev_lock_count <= 0))
1016                 goto end;
1017         if (--bebob->dev_lock_count == 0)
1018                 snd_bebob_stream_lock_changed(bebob);
1019 end:
1020         spin_unlock_irq(&bebob->lock);
1021 }