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                         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                 if (strncmp(clk_spec->labels[id], SND_BEBOB_CLOCK_INTERNAL,
 147                             strlen(SND_BEBOB_CLOCK_INTERNAL)) == 0)
 148                         *internal = true;
 149
 150                 goto end;
 151         }
 152
 153         /*
 154          * 2.The device don't support to switch source of clock then assumed
 155          *   to use internal clock always
 156          */
 157         if (bebob->sync_input_plug < 0) {
 158                 *internal = true;
 159                 goto end;
 160         }
 161
 162         /*
 163          * 3.The device supports to switch source of clock by an usual way.
 164          *   Let's check input for 'Music Sub Unit Sync Input' plug.
 165          */
 166         avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
 167                                    bebob->sync_input_plug);
 168         err = avc_bridgeco_get_plug_input(bebob->unit, addr, input);
 169         if (err < 0) {
 170                 dev_err(&bebob->unit->device,
 171                         "fail to get an input for MSU in plug %d: %d\n",
 172                         bebob->sync_input_plug, err);
 173                 goto end;
 174         }
 175
 176         /*
 177          * If there are no input plugs, all of fields are 0xff.
 178          * Here check the first field. This field is used for direction.
 179          */
 180         if (input[0] == 0xff) {
 181                 *internal = true;
 182                 goto end;
 183         }
 184
 185         /*
 186          * If source of clock is internal CSR, Music Sub Unit Sync Input is
 187          * a destination of Music Sub Unit Sync Output.
 188          */
 189         *internal = ((input[0] == AVC_BRIDGECO_PLUG_DIR_OUT) &&
 190                      (input[1] == AVC_BRIDGECO_PLUG_MODE_SUBUNIT) &&
 191                      (input[2] == 0x0c) &&
 192                      (input[3] == 0x00));
 193 end:
 194         return err;
 195 }
 196
 197 static unsigned int
 198 map_data_channels(struct snd_bebob *bebob, struct amdtp_stream *s)
 199 {
 200         unsigned int sec, sections, ch, channels;
 201         unsigned int pcm, midi, location;
 202         unsigned int stm_pos, sec_loc, pos;
 203         u8 *buf, addr[AVC_BRIDGECO_ADDR_BYTES], type;
 204         enum avc_bridgeco_plug_dir dir;
 205         int err;
 206
 207         /*
 208          * The length of return value of this command cannot be expected. Here
 209          * use the maximum length of FCP.
 210          */
 211         buf = kzalloc(256, GFP_KERNEL);
 212         if (buf == NULL)
 213                 return -ENOMEM;
 214
 215         if (s == &bebob->tx_stream)
 216                 dir = AVC_BRIDGECO_PLUG_DIR_OUT;
 217         else
 218                 dir = AVC_BRIDGECO_PLUG_DIR_IN;
 219
 220         avc_bridgeco_fill_unit_addr(addr, dir, AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 221         err = avc_bridgeco_get_plug_ch_pos(bebob->unit, addr, buf, 256);
 222         if (err < 0) {
 223                 dev_err(&bebob->unit->device,
 224                         "fail to get channel position for isoc %s plug 0: %d\n",
 225                         (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" : "out",
 226                         err);
 227                 goto end;
 228         }
 229         pos = 0;
 230
 231         /* positions in I/O buffer */
 232         pcm = 0;
 233         midi = 0;
 234
 235         /* the number of sections in AMDTP packet */
 236         sections = buf[pos++];
 237
 238         for (sec = 0; sec < sections; sec++) {
 239                 /* type of this section */
 240                 avc_bridgeco_fill_unit_addr(addr, dir,
 241                                             AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 242                 err = avc_bridgeco_get_plug_section_type(bebob->unit, addr,
 243                                                          sec, &type);
 244                 if (err < 0) {
 245                         dev_err(&bebob->unit->device,
 246                         "fail to get section type for isoc %s plug 0: %d\n",
 247                                 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :
 248                                                                     "out",
 249                                 err);
 250                         goto end;
 251                 }
 252                 /* NoType */
 253                 if (type == 0xff) {
 254                         err = -ENOSYS;
 255                         goto end;
 256                 }
 257
 258                 /* the number of channels in this section */
 259                 channels = buf[pos++];
 260
 261                 for (ch = 0; ch < channels; ch++) {
 262                         /* position of this channel in AMDTP packet */
 263                         stm_pos = buf[pos++] - 1;
 264                         /* location of this channel in this section */
 265                         sec_loc = buf[pos++] - 1;
 266
 267                         /*
 268                          * Basically the number of location is within the
 269                          * number of channels in this section. But some models
 270                          * of M-Audio don't follow this. Its location for MIDI
 271                          * is the position of MIDI channels in AMDTP packet.
 272                          */
 273                         if (sec_loc >= channels)
 274                                 sec_loc = ch;
 275
 276                         switch (type) {
 277                         /* for MIDI conformant data channel */
 278                         case 0x0a:
 279                                 /* AMDTP_MAX_CHANNELS_FOR_MIDI is 1. */
 280                                 if ((midi > 0) && (stm_pos != midi)) {
 281                                         err = -ENOSYS;
 282                                         goto end;
 283                                 }
 284                                 s->midi_position = stm_pos;
 285                                 midi = stm_pos;
 286                                 break;
 287                         /* for PCM data channel */
 288                         case 0x01:      /* Headphone */
 289                         case 0x02:      /* Microphone */
 290                         case 0x03:      /* Line */
 291                         case 0x04:      /* SPDIF */
 292                         case 0x05:      /* ADAT */
 293                         case 0x06:      /* TDIF */
 294                         case 0x07:      /* MADI */
 295                         /* for undefined/changeable signal  */
 296                         case 0x08:      /* Analog */
 297                         case 0x09:      /* Digital */
 298                         default:
 299                                 location = pcm + sec_loc;
 300                                 if (location >= AMDTP_MAX_CHANNELS_FOR_PCM) {
 301                                         err = -ENOSYS;
 302                                         goto end;
 303                                 }
 304                                 s->pcm_positions[location] = stm_pos;
 305                                 break;
 306                         }
 307                 }
 308
 309                 if (type != 0x0a)
 310                         pcm += channels;
 311                 else
 312                         midi += channels;
 313         }
 314 end:
 315         kfree(buf);
 316         return err;
 317 }
 318
 319 static int
 320 init_both_connections(struct snd_bebob *bebob)
 321 {
 322         int err;
 323
 324         err = cmp_connection_init(&bebob->in_conn,
 325                                   bebob->unit, CMP_INPUT, 0);
 326         if (err < 0)
 327                 goto end;
 328
 329         err = cmp_connection_init(&bebob->out_conn,
 330                                   bebob->unit, CMP_OUTPUT, 0);
 331         if (err < 0)
 332                 cmp_connection_destroy(&bebob->in_conn);
 333 end:
 334         return err;
 335 }
 336
 337 static int
 338 check_connection_used_by_others(struct snd_bebob *bebob, struct amdtp_stream *s)
 339 {
 340         struct cmp_connection *conn;
 341         bool used;
 342         int err;
 343
 344         if (s == &bebob->tx_stream)
 345                 conn = &bebob->out_conn;
 346         else
 347                 conn = &bebob->in_conn;
 348
 349         err = cmp_connection_check_used(conn, &used);
 350         if ((err >= 0) && used && !amdtp_stream_running(s)) {
 351                 dev_err(&bebob->unit->device,
 352                         "Connection established by others: %cPCR[%d]\n",
 353                         (conn->direction == CMP_OUTPUT) ? 'o' : 'i',
 354                         conn->pcr_index);
 355                 err = -EBUSY;
 356         }
 357
 358         return err;
 359 }
 360
 361 static int
 362 make_both_connections(struct snd_bebob *bebob, unsigned int rate)
 363 {
 364         int index, pcm_channels, midi_channels, err = 0;
 365
 366         if (bebob->connected)
 367                 goto end;
 368
 369         /* confirm params for both streams */
 370         index = get_formation_index(rate);
 371         pcm_channels = bebob->tx_stream_formations[index].pcm;
 372         midi_channels = bebob->tx_stream_formations[index].midi;
 373         amdtp_stream_set_parameters(&bebob->tx_stream,
 374                                     rate, pcm_channels, midi_channels * 8);
 375         pcm_channels = bebob->rx_stream_formations[index].pcm;
 376         midi_channels = bebob->rx_stream_formations[index].midi;
 377         amdtp_stream_set_parameters(&bebob->rx_stream,
 378                                     rate, pcm_channels, midi_channels * 8);
 379
 380         /* establish connections for both streams */
 381         err = cmp_connection_establish(&bebob->out_conn,
 382                         amdtp_stream_get_max_payload(&bebob->tx_stream));
 383         if (err < 0)
 384                 goto end;
 385         err = cmp_connection_establish(&bebob->in_conn,
 386                         amdtp_stream_get_max_payload(&bebob->rx_stream));
 387         if (err < 0) {
 388                 cmp_connection_break(&bebob->out_conn);
 389                 goto end;
 390         }
 391
 392         bebob->connected = true;
 393 end:
 394         return err;
 395 }
 396
 397 static void
 398 break_both_connections(struct snd_bebob *bebob)
 399 {
 400         cmp_connection_break(&bebob->in_conn);
 401         cmp_connection_break(&bebob->out_conn);
 402
 403         bebob->connected = false;
 404
 405         /* These models seems to be in transition state for a longer time. */
 406         if (bebob->maudio_special_quirk != NULL)
 407                 msleep(200);
 408 }
 409
 410 static void
 411 destroy_both_connections(struct snd_bebob *bebob)
 412 {
 413         break_both_connections(bebob);
 414
 415         cmp_connection_destroy(&bebob->in_conn);
 416         cmp_connection_destroy(&bebob->out_conn);
 417 }
 418
 419 static int
 420 get_sync_mode(struct snd_bebob *bebob, enum cip_flags *sync_mode)
 421 {
 422         /* currently this module doesn't support SYT-Match mode */
 423         *sync_mode = CIP_SYNC_TO_DEVICE;
 424         return 0;
 425 }
 426
 427 static int
 428 start_stream(struct snd_bebob *bebob, struct amdtp_stream *stream,
 429              unsigned int rate)
 430 {
 431         struct cmp_connection *conn;
 432         int err = 0;
 433
 434         if (stream == &bebob->rx_stream)
 435                 conn = &bebob->in_conn;
 436         else
 437                 conn = &bebob->out_conn;
 438
 439         /* channel mapping */
 440         if (bebob->maudio_special_quirk == NULL) {
 441                 err = map_data_channels(bebob, stream);
 442                 if (err < 0)
 443                         goto end;
 444         }
 445
 446         /* start amdtp stream */
 447         err = amdtp_stream_start(stream,
 448                                  conn->resources.channel,
 449                                  conn->speed);
 450 end:
 451         return err;
 452 }
 453
 454 int snd_bebob_stream_init_duplex(struct snd_bebob *bebob)
 455 {
 456         int err;
 457
 458         err = init_both_connections(bebob);
 459         if (err < 0)
 460                 goto end;
 461
 462         err = amdtp_stream_init(&bebob->tx_stream, bebob->unit,
 463                                 AMDTP_IN_STREAM, CIP_BLOCKING);
 464         if (err < 0) {
 465                 amdtp_stream_destroy(&bebob->tx_stream);
 466                 destroy_both_connections(bebob);
 467                 goto end;
 468         }
 469         /* See comments in next function */
 470         init_completion(&bebob->bus_reset);
 471         bebob->tx_stream.flags |= CIP_SKIP_INIT_DBC_CHECK;
 472         /*
 473          * At high sampling rate, M-Audio special firmware transmits empty
 474          * packet with the value of dbc incremented by 8 but the others are
 475          * valid to IEC 61883-1.
 476          */
 477         if (bebob->maudio_special_quirk)
 478                 bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC;
 479
 480         err = amdtp_stream_init(&bebob->rx_stream, bebob->unit,
 481                                 AMDTP_OUT_STREAM, CIP_BLOCKING);
 482         if (err < 0) {
 483                 amdtp_stream_destroy(&bebob->tx_stream);
 484                 amdtp_stream_destroy(&bebob->rx_stream);
 485                 destroy_both_connections(bebob);
 486         }
 487 end:
 488         return err;
 489 }
 490
 491 int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, unsigned int rate)
 492 {
 493         struct snd_bebob_rate_spec *rate_spec = bebob->spec->rate;
 494         struct amdtp_stream *master, *slave;
 495         atomic_t *slave_substreams;
 496         enum cip_flags sync_mode;
 497         unsigned int curr_rate;
 498         bool updated = false;
 499         int err = 0;
 500
 501         /*
 502          * Normal BeBoB firmware has a quirk at bus reset to transmits packets
 503          * with discontinuous value in dbc field.
 504          *
 505          * This 'struct completion' is used to call .update() at first to update
 506          * connections/streams. Next following codes handle streaming error.
 507          */
 508         if (amdtp_streaming_error(&bebob->tx_stream)) {
 509                 if (completion_done(&bebob->bus_reset))
 510                         reinit_completion(&bebob->bus_reset);
 511
 512                 updated = (wait_for_completion_interruptible_timeout(
 513                                 &bebob->bus_reset,
 514                                 msecs_to_jiffies(FW_ISO_RESOURCE_DELAY)) > 0);
 515         }
 516
 517         mutex_lock(&bebob->mutex);
 518
 519         /* Need no substreams */
 520         if (atomic_read(&bebob->playback_substreams) == 0 &&
 521             atomic_read(&bebob->capture_substreams)  == 0)
 522                 goto end;
 523
 524         err = get_sync_mode(bebob, &sync_mode);
 525         if (err < 0)
 526                 goto end;
 527         if (sync_mode == CIP_SYNC_TO_DEVICE) {
 528                 master = &bebob->tx_stream;
 529                 slave  = &bebob->rx_stream;
 530                 slave_substreams = &bebob->playback_substreams;
 531         } else {
 532                 master = &bebob->rx_stream;
 533                 slave  = &bebob->tx_stream;
 534                 slave_substreams = &bebob->capture_substreams;
 535         }
 536
 537         /*
 538          * Considering JACK/FFADO streaming:
 539          * TODO: This can be removed hwdep functionality becomes popular.
 540          */
 541         err = check_connection_used_by_others(bebob, master);
 542         if (err < 0)
 543                 goto end;
 544
 545         /*
 546          * packet queueing error or detecting discontinuity
 547          *
 548          * At bus reset, connections should not be broken here. So streams need
 549          * to be re-started. This is a reason to use SKIP_INIT_DBC_CHECK flag.
 550          */
 551         if (amdtp_streaming_error(master))
 552                 amdtp_stream_stop(master);
 553         if (amdtp_streaming_error(slave))
 554                 amdtp_stream_stop(slave);
 555         if (!updated &&
 556             !amdtp_stream_running(master) && !amdtp_stream_running(slave))
 557                 break_both_connections(bebob);
 558
 559         /* stop streams if rate is different */
 560         err = rate_spec->get(bebob, &curr_rate);
 561         if (err < 0) {
 562                 dev_err(&bebob->unit->device,
 563                         "fail to get sampling rate: %d\n", err);
 564                 goto end;
 565         }
 566         if (rate == 0)
 567                 rate = curr_rate;
 568         if (rate != curr_rate) {
 569                 amdtp_stream_stop(master);
 570                 amdtp_stream_stop(slave);
 571                 break_both_connections(bebob);
 572         }
 573
 574         /* master should be always running */
 575         if (!amdtp_stream_running(master)) {
 576                 amdtp_stream_set_sync(sync_mode, master, slave);
 577                 bebob->master = master;
 578
 579                 /*
 580                  * NOTE:
 581                  * If establishing connections at first, Yamaha GO46
 582                  * (and maybe Terratec X24) don't generate sound.
 583                  *
 584                  * For firmware customized by M-Audio, refer to next NOTE.
 585                  */
 586                 if (bebob->maudio_special_quirk == NULL) {
 587                         err = rate_spec->set(bebob, rate);
 588                         if (err < 0) {
 589                                 dev_err(&bebob->unit->device,
 590                                         "fail to set sampling rate: %d\n",
 591                                         err);
 592                                 goto end;
 593                         }
 594                 }
 595
 596                 err = make_both_connections(bebob, rate);
 597                 if (err < 0)
 598                         goto end;
 599
 600                 err = start_stream(bebob, master, rate);
 601                 if (err < 0) {
 602                         dev_err(&bebob->unit->device,
 603                                 "fail to run AMDTP master stream:%d\n", err);
 604                         break_both_connections(bebob);
 605                         goto end;
 606                 }
 607
 608                 /*
 609                  * NOTE:
 610                  * The firmware customized by M-Audio uses these commands to
 611                  * start transmitting stream. This is not usual way.
 612                  */
 613                 if (bebob->maudio_special_quirk != NULL) {
 614                         err = rate_spec->set(bebob, rate);
 615                         if (err < 0) {
 616                                 dev_err(&bebob->unit->device,
 617                                         "fail to ensure sampling rate: %d\n",
 618                                         err);
 619                                 amdtp_stream_stop(master);
 620                                 break_both_connections(bebob);
 621                                 goto end;
 622                         }
 623                 }
 624
 625                 /* wait first callback */
 626                 if (!amdtp_stream_wait_callback(master, CALLBACK_TIMEOUT)) {
 627                         amdtp_stream_stop(master);
 628                         break_both_connections(bebob);
 629                         err = -ETIMEDOUT;
 630                         goto end;
 631                 }
 632         }
 633
 634         /* start slave if needed */
 635         if (atomic_read(slave_substreams) > 0 && !amdtp_stream_running(slave)) {
 636                 err = start_stream(bebob, slave, rate);
 637                 if (err < 0) {
 638                         dev_err(&bebob->unit->device,
 639                                 "fail to run AMDTP slave stream:%d\n", err);
 640                         amdtp_stream_stop(master);
 641                         break_both_connections(bebob);
 642                         goto end;
 643                 }
 644
 645                 /* wait first callback */
 646                 if (!amdtp_stream_wait_callback(slave, CALLBACK_TIMEOUT)) {
 647                         amdtp_stream_stop(slave);
 648                         amdtp_stream_stop(master);
 649                         break_both_connections(bebob);
 650                         err = -ETIMEDOUT;
 651                 }
 652         }
 653 end:
 654         mutex_unlock(&bebob->mutex);
 655         return err;
 656 }
 657
 658 void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob)
 659 {
 660         struct amdtp_stream *master, *slave;
 661         atomic_t *master_substreams, *slave_substreams;
 662
 663         if (bebob->master == &bebob->rx_stream) {
 664                 slave  = &bebob->tx_stream;
 665                 master = &bebob->rx_stream;
 666                 slave_substreams  = &bebob->capture_substreams;
 667                 master_substreams = &bebob->playback_substreams;
 668         } else {
 669                 slave  = &bebob->rx_stream;
 670                 master = &bebob->tx_stream;
 671                 slave_substreams  = &bebob->playback_substreams;
 672                 master_substreams = &bebob->capture_substreams;
 673         }
 674
 675         mutex_lock(&bebob->mutex);
 676
 677         if (atomic_read(slave_substreams) == 0) {
 678                 amdtp_stream_pcm_abort(slave);
 679                 amdtp_stream_stop(slave);
 680
 681                 if (atomic_read(master_substreams) == 0) {
 682                         amdtp_stream_pcm_abort(master);
 683                         amdtp_stream_stop(master);
 684                         break_both_connections(bebob);
 685                 }
 686         }
 687
 688         mutex_unlock(&bebob->mutex);
 689 }
 690
 691 void snd_bebob_stream_update_duplex(struct snd_bebob *bebob)
 692 {
 693         /* vs. XRUN recovery due to discontinuity at bus reset */
 694         mutex_lock(&bebob->mutex);
 695
 696         if ((cmp_connection_update(&bebob->in_conn) < 0) ||
 697             (cmp_connection_update(&bebob->out_conn) < 0)) {
 698                 amdtp_stream_pcm_abort(&bebob->rx_stream);
 699                 amdtp_stream_pcm_abort(&bebob->tx_stream);
 700                 amdtp_stream_stop(&bebob->rx_stream);
 701                 amdtp_stream_stop(&bebob->tx_stream);
 702                 break_both_connections(bebob);
 703         } else {
 704                 amdtp_stream_update(&bebob->rx_stream);
 705                 amdtp_stream_update(&bebob->tx_stream);
 706         }
 707
 708         /* wake up stream_start_duplex() */
 709         if (!completion_done(&bebob->bus_reset))
 710                 complete_all(&bebob->bus_reset);
 711
 712         mutex_unlock(&bebob->mutex);
 713 }
 714
 715 void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob)
 716 {
 717         mutex_lock(&bebob->mutex);
 718
 719         amdtp_stream_pcm_abort(&bebob->rx_stream);
 720         amdtp_stream_pcm_abort(&bebob->tx_stream);
 721
 722         amdtp_stream_stop(&bebob->rx_stream);
 723         amdtp_stream_stop(&bebob->tx_stream);
 724
 725         amdtp_stream_destroy(&bebob->rx_stream);
 726         amdtp_stream_destroy(&bebob->tx_stream);
 727
 728         destroy_both_connections(bebob);
 729
 730         mutex_unlock(&bebob->mutex);
 731 }
 732
 733 /*
 734  * See: Table 50: Extended Stream Format Info Format Hierarchy Level 2’
 735  * in Additional AVC commands (Nov 2003, BridgeCo)
 736  * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
 737  */
 738 static int
 739 parse_stream_formation(u8 *buf, unsigned int len,
 740                        struct snd_bebob_stream_formation *formation)
 741 {
 742         unsigned int i, e, channels, format;
 743
 744         /*
 745          * this module can support a hierarchy combination that:
 746          *  Root:       Audio and Music (0x90)
 747          *  Level 1:    AM824 Compound  (0x40)
 748          */
 749         if ((buf[0] != 0x90) || (buf[1] != 0x40))
 750                 return -ENOSYS;
 751
 752         /* check sampling rate */
 753         for (i = 0; i < ARRAY_SIZE(bridgeco_freq_table); i++) {
 754                 if (buf[2] == bridgeco_freq_table[i])
 755                         break;
 756         }
 757         if (i == ARRAY_SIZE(bridgeco_freq_table))
 758                 return -ENOSYS;
 759
 760         /* Avoid double count by different entries for the same rate. */
 761         memset(&formation[i], 0, sizeof(struct snd_bebob_stream_formation));
 762
 763         for (e = 0; e < buf[4]; e++) {
 764                 channels = buf[5 + e * 2];
 765                 format = buf[6 + e * 2];
 766
 767                 switch (format) {
 768                 /* IEC 60958 Conformant, currently handled as MBLA */
 769                 case 0x00:
 770                 /* Multi bit linear audio */
 771                 case 0x06:      /* Raw */
 772                         formation[i].pcm += channels;
 773                         break;
 774                 /* MIDI Conformant */
 775                 case 0x0d:
 776                         formation[i].midi += channels;
 777                         break;
 778                 /* IEC 61937-3 to 7 */
 779                 case 0x01:
 780                 case 0x02:
 781                 case 0x03:
 782                 case 0x04:
 783                 case 0x05:
 784                 /* Multi bit linear audio */
 785                 case 0x07:      /* DVD-Audio */
 786                 case 0x0c:      /* High Precision */
 787                 /* One Bit Audio */
 788                 case 0x08:      /* (Plain) Raw */
 789                 case 0x09:      /* (Plain) SACD */
 790                 case 0x0a:      /* (Encoded) Raw */
 791                 case 0x0b:      /* (Encoded) SACD */
 792                 /* Synchronization Stream (Stereo Raw audio) */
 793                 case 0x40:
 794                 /* Don't care */
 795                 case 0xff:
 796                 default:
 797                         return -ENOSYS; /* not supported */
 798                 }
 799         }
 800
 801         if (formation[i].pcm  > AMDTP_MAX_CHANNELS_FOR_PCM ||
 802             formation[i].midi > AMDTP_MAX_CHANNELS_FOR_MIDI)
 803                 return -ENOSYS;
 804
 805         return 0;
 806 }
 807
 808 static int
 809 fill_stream_formations(struct snd_bebob *bebob, enum avc_bridgeco_plug_dir dir,
 810                        unsigned short pid)
 811 {
 812         u8 *buf;
 813         struct snd_bebob_stream_formation *formations;
 814         unsigned int len, eid;
 815         u8 addr[AVC_BRIDGECO_ADDR_BYTES];
 816         int err;
 817
 818         buf = kmalloc(FORMAT_MAXIMUM_LENGTH, GFP_KERNEL);
 819         if (buf == NULL)
 820                 return -ENOMEM;
 821
 822         if (dir == AVC_BRIDGECO_PLUG_DIR_IN)
 823                 formations = bebob->rx_stream_formations;
 824         else
 825                 formations = bebob->tx_stream_formations;
 826
 827         for (eid = 0; eid < SND_BEBOB_STRM_FMT_ENTRIES; eid++) {
 828                 len = FORMAT_MAXIMUM_LENGTH;
 829                 avc_bridgeco_fill_unit_addr(addr, dir,
 830                                             AVC_BRIDGECO_PLUG_UNIT_ISOC, pid);
 831                 err = avc_bridgeco_get_plug_strm_fmt(bebob->unit, addr, buf,
 832                                                      &len, eid);
 833                 /* No entries remained. */
 834                 if (err == -EINVAL && eid > 0) {
 835                         err = 0;
 836                         break;
 837                 } else if (err < 0) {
 838                         dev_err(&bebob->unit->device,
 839                         "fail to get stream format %d for isoc %s plug %d:%d\n",
 840                                 eid,
 841                                 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :
 842                                                                     "out",
 843                                 pid, err);
 844                         break;
 845                 }
 846
 847                 err = parse_stream_formation(buf, len, formations);
 848                 if (err < 0)
 849                         break;
 850         }
 851
 852         kfree(buf);
 853         return err;
 854 }
 855
 856 static int
 857 seek_msu_sync_input_plug(struct snd_bebob *bebob)
 858 {
 859         u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
 860         unsigned int i;
 861         enum avc_bridgeco_plug_type type;
 862         int err;
 863
 864         /* Get the number of Music Sub Unit for both direction. */
 865         err = avc_general_get_plug_info(bebob->unit, 0x0c, 0x00, 0x00, plugs);
 866         if (err < 0) {
 867                 dev_err(&bebob->unit->device,
 868                         "fail to get info for MSU in/out plugs: %d\n",
 869                         err);
 870                 goto end;
 871         }
 872
 873         /* seek destination plugs for 'MSU sync input' */
 874         bebob->sync_input_plug = -1;
 875         for (i = 0; i < plugs[0]; i++) {
 876                 avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN, i);
 877                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 878                 if (err < 0) {
 879                         dev_err(&bebob->unit->device,
 880                                 "fail to get type for MSU in plug %d: %d\n",
 881                                 i, err);
 882                         goto end;
 883                 }
 884
 885                 if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
 886                         bebob->sync_input_plug = i;
 887                         break;
 888                 }
 889         }
 890 end:
 891         return err;
 892 }
 893
 894 int snd_bebob_stream_discover(struct snd_bebob *bebob)
 895 {
 896         struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
 897         u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
 898         enum avc_bridgeco_plug_type type;
 899         unsigned int i;
 900         int err;
 901
 902         /* the number of plugs for isoc in/out, ext in/out  */
 903         err = avc_general_get_plug_info(bebob->unit, 0x1f, 0x07, 0x00, plugs);
 904         if (err < 0) {
 905                 dev_err(&bebob->unit->device,
 906                 "fail to get info for isoc/external in/out plugs: %d\n",
 907                         err);
 908                 goto end;
 909         }
 910
 911         /*
 912          * This module supports at least one isoc input plug and one isoc
 913          * output plug.
 914          */
 915         if ((plugs[0] == 0) || (plugs[1] == 0)) {
 916                 err = -ENOSYS;
 917                 goto end;
 918         }
 919
 920         avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
 921                                     AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 922         err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 923         if (err < 0) {
 924                 dev_err(&bebob->unit->device,
 925                         "fail to get type for isoc in plug 0: %d\n", err);
 926                 goto end;
 927         } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
 928                 err = -ENOSYS;
 929                 goto end;
 930         }
 931         err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_IN, 0);
 932         if (err < 0)
 933                 goto end;
 934
 935         avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
 936                                     AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 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 isoc out plug 0: %d\n", err);
 941                 goto end;
 942         } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
 943                 err = -ENOSYS;
 944                 goto end;
 945         }
 946         err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_OUT, 0);
 947         if (err < 0)
 948                 goto end;
 949
 950         /* count external input plugs for MIDI */
 951         bebob->midi_input_ports = 0;
 952         for (i = 0; i < plugs[2]; i++) {
 953                 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
 954                                             AVC_BRIDGECO_PLUG_UNIT_EXT, i);
 955                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 956                 if (err < 0) {
 957                         dev_err(&bebob->unit->device,
 958                         "fail to get type for external in plug %d: %d\n",
 959                                 i, err);
 960                         goto end;
 961                 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
 962                         bebob->midi_input_ports++;
 963                 }
 964         }
 965
 966         /* count external output plugs for MIDI */
 967         bebob->midi_output_ports = 0;
 968         for (i = 0; i < plugs[3]; i++) {
 969                 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
 970                                             AVC_BRIDGECO_PLUG_UNIT_EXT, i);
 971                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
 972                 if (err < 0) {
 973                         dev_err(&bebob->unit->device,
 974                         "fail to get type for external out plug %d: %d\n",
 975                                 i, err);
 976                         goto end;
 977                 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
 978                         bebob->midi_output_ports++;
 979                 }
 980         }
 981
 982         /* for check source of clock later */
 983         if (!clk_spec)
 984                 err = seek_msu_sync_input_plug(bebob);
 985 end:
 986         return err;
 987 }
 988
 989 void snd_bebob_stream_lock_changed(struct snd_bebob *bebob)
 990 {
 991         bebob->dev_lock_changed = true;
 992         wake_up(&bebob->hwdep_wait);
 993 }
 994
 995 int snd_bebob_stream_lock_try(struct snd_bebob *bebob)
 996 {
 997         int err;
 998
 999         spin_lock_irq(&bebob->lock);
1000
1001         /* user land lock this */
1002         if (bebob->dev_lock_count < 0) {
1003                 err = -EBUSY;
1004                 goto end;
1005         }
1006
1007         /* this is the first time */
1008         if (bebob->dev_lock_count++ == 0)
1009                 snd_bebob_stream_lock_changed(bebob);
1010         err = 0;
1011 end:
1012         spin_unlock_irq(&bebob->lock);
1013         return err;
1014 }
1015
1016 void snd_bebob_stream_lock_release(struct snd_bebob *bebob)
1017 {
1018         spin_lock_irq(&bebob->lock);
1019
1020         if (WARN_ON(bebob->dev_lock_count <= 0))
1021                 goto end;
1022         if (--bebob->dev_lock_count == 0)
1023                 snd_bebob_stream_lock_changed(bebob);
1024 end:
1025         spin_unlock_irq(&bebob->lock);
1026 }