kernel/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        2000
  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 int
  51 get_formation_index(unsigned int rate, unsigned int *index)
  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                         *index = i;
  58                         return 0;
  59                 }
  60         }
  61         return -EINVAL;
  62 }
  63
  64 int
  65 snd_bebob_stream_get_rate(struct snd_bebob *bebob, unsigned int *curr_rate)
  66 {
  67         unsigned int tx_rate, rx_rate, trials;
  68         int err;
  69
  70         trials = 0;
  71         do {
  72                 err = avc_general_get_sig_fmt(bebob->unit, &tx_rate,
  73                                               AVC_GENERAL_PLUG_DIR_OUT, 0);
  74         } while (err == -EAGAIN && ++trials < 3);
  75         if (err < 0)
  76                 goto end;
  77
  78         trials = 0;
  79         do {
  80                 err = avc_general_get_sig_fmt(bebob->unit, &rx_rate,
  81                                               AVC_GENERAL_PLUG_DIR_IN, 0);
  82         } while (err == -EAGAIN && ++trials < 3);
  83         if (err < 0)
  84                 goto end;
  85
  86         *curr_rate = rx_rate;
  87         if (rx_rate == tx_rate)
  88                 goto end;
  89
  90         /* synchronize receive stream rate to transmit stream rate */
  91         err = avc_general_set_sig_fmt(bebob->unit, rx_rate,
  92                                       AVC_GENERAL_PLUG_DIR_IN, 0);
  93 end:
  94         return err;
  95 }
  96
  97 int
  98 snd_bebob_stream_set_rate(struct snd_bebob *bebob, unsigned int rate)
  99 {
 100         int err;
 101
 102         err = avc_general_set_sig_fmt(bebob->unit, rate,
 103                                       AVC_GENERAL_PLUG_DIR_OUT, 0);
 104         if (err < 0)
 105                 goto end;
 106
 107         err = avc_general_set_sig_fmt(bebob->unit, rate,
 108                                       AVC_GENERAL_PLUG_DIR_IN, 0);
 109         if (err < 0)
 110                 goto end;
 111
 112         /*
 113          * Some devices need a bit time for transition.
 114          * 300msec is got by some experiments.
 115          */
 116         msleep(300);
 117 end:
 118         return err;
 119 }
 120
 121 int snd_bebob_stream_get_clock_src(struct snd_bebob *bebob,
 122                                    enum snd_bebob_clock_type *src)
 123 {
 124         const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
 125         u8 addr[AVC_BRIDGECO_ADDR_BYTES], input[7];
 126         unsigned int id;
 127         enum avc_bridgeco_plug_type type;
 128         int err = 0;
 129
 130         /* 1.The device has its own operation to switch source of clock */
 131         if (clk_spec) {
 132                 err = clk_spec->get(bebob, &id);
 133                 if (err < 0) {
 134                         dev_err(&bebob->unit->device,
 135                                 "fail to get clock source: %d\n", err);
 136                         goto end;
 137                 }
 138
 139                 if (id >= clk_spec->num) {
 140                         dev_err(&bebob->unit->device,
 141                                 "clock source %d out of range 0..%d\n",
 142                                 id, clk_spec->num - 1);
 143                         err = -EIO;
 144                         goto end;
 145                 }
 146
 147                 *src = clk_spec->types[id];
 148                 goto end;
 149         }
 150
 151         /*
 152          * 2.The device don't support to switch source of clock then assumed
 153          *   to use internal clock always
 154          */
 155         if (bebob->sync_input_plug < 0) {
 156                 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
 157                 goto end;
 158         }
 159
 160         /*
 161          * 3.The device supports to switch source of clock by an usual way.
 162          *   Let's check input for 'Music Sub Unit Sync Input' plug.
 163          */
 164         avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
 165                                    bebob->sync_input_plug);
 166         err = avc_bridgeco_get_plug_input(bebob->unit, addr, input);
 167         if (err < 0) {
 168                 dev_err(&bebob->unit->device,
 169                         "fail to get an input for MSU in plug %d: %d\n",
 170                         bebob->sync_input_plug, err);
 171                 goto end;
 172         }
 173
 174         /*
 175          * If there are no input plugs, all of fields are 0xff.
 176          * Here check the first field. This field is used for direction.
 177          */
 178         if (input[0] == 0xff) {
 179                 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
 180                 goto end;
 181         }
 182
 183         /* The source from any output plugs is for one purpose only. */
 184         if (input[0] == AVC_BRIDGECO_PLUG_DIR_OUT) {
 185                 /*
 186                  * In BeBoB architecture, the source from music subunit may
 187                  * bypass from oPCR[0]. This means that this source gives
 188                  * synchronization to IEEE 1394 cycle start packet.
 189                  */
 190                 if (input[1] == AVC_BRIDGECO_PLUG_MODE_SUBUNIT &&
 191                     input[2] == 0x0c) {
 192                         *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
 193                         goto end;
 194                 }
 195         /* The source from any input units is for several purposes. */
 196         } else if (input[1] == AVC_BRIDGECO_PLUG_MODE_UNIT) {
 197                 if (input[2] == AVC_BRIDGECO_PLUG_UNIT_ISOC) {
 198                         if (input[3] == 0x00) {
 199                                 /*
 200                                  * This source comes from iPCR[0]. This means
 201                                  * that presentation timestamp calculated by
 202                                  * SYT series of the received packets. In
 203                                  * short, this driver is the master of
 204                                  * synchronization.
 205                                  */
 206                                 *src = SND_BEBOB_CLOCK_TYPE_SYT;
 207                                 goto end;
 208                         } else {
 209                                 /*
 210                                  * This source comes from iPCR[1-29]. This
 211                                  * means that the synchronization stream is not
 212                                  * the Audio/MIDI compound stream.
 213                                  */
 214                                 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
 215                                 goto end;
 216                         }
 217                 } else if (input[2] == AVC_BRIDGECO_PLUG_UNIT_EXT) {
 218                         /* Check type of this plug.  */
 219                         avc_bridgeco_fill_unit_addr(addr,
 220                                                     AVC_BRIDGECO_PLUG_DIR_IN,
 221                                                     AVC_BRIDGECO_PLUG_UNIT_EXT,
 222                                                     input[3]);
 223                         err = avc_bridgeco_get_plug_type(bebob->unit, addr,
 224                                                          &type);
 225                         if (err < 0)
 226                                 goto end;
 227
 228                         if (type == AVC_BRIDGECO_PLUG_TYPE_DIG) {
 229                                 /*
 230                                  * SPDIF/ADAT or sometimes (not always) word
 231                                  * clock.
 232                                  */
 233                                 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
 234                                 goto end;
 235                         } else if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
 236                                 /* Often word clock. */
 237                                 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
 238                                 goto end;
 239                         } else if (type == AVC_BRIDGECO_PLUG_TYPE_ADDITION) {
 240                                 /*
 241                                  * Not standard.
 242                                  * Mostly, additional internal clock.
 243                                  */
 244                                 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
 245                                 goto end;
 246                         }
 247                 }
 248         }
 249
 250         /* Not supported. */
 251         err = -EIO;
 252 end:
 253         return err;
 254 }
 255
 256 static unsigned int
 257 map_data_channels(struct snd_bebob *bebob, struct amdtp_stream *s)
 258 {
 259         unsigned int sec, sections, ch, channels;
 260         unsigned int pcm, midi, location;
 261         unsigned int stm_pos, sec_loc, pos;
 262         u8 *buf, addr[AVC_BRIDGECO_ADDR_BYTES], type;
 263         enum avc_bridgeco_plug_dir dir;
 264         int err;
 265
 266         /*
 267          * The length of return value of this command cannot be expected. Here
 268          * use the maximum length of FCP.
 269          */
 270         buf = kzalloc(256, GFP_KERNEL);
 271         if (buf == NULL)
 272                 return -ENOMEM;
 273
 274         if (s == &bebob->tx_stream)
 275                 dir = AVC_BRIDGECO_PLUG_DIR_OUT;
 276         else
 277                 dir = AVC_BRIDGECO_PLUG_DIR_IN;
 278
 279         avc_bridgeco_fill_unit_addr(addr, dir, AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 280         err = avc_bridgeco_get_plug_ch_pos(bebob->unit, addr, buf, 256);
 281         if (err < 0) {
 282                 dev_err(&bebob->unit->device,
 283                         "fail to get channel position for isoc %s plug 0: %d\n",
 284                         (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" : "out",
 285                         err);
 286                 goto end;
 287         }
 288         pos = 0;
 289
 290         /* positions in I/O buffer */
 291         pcm = 0;
 292         midi = 0;
 293
 294         /* the number of sections in AMDTP packet */
 295         sections = buf[pos++];
 296
 297         for (sec = 0; sec < sections; sec++) {
 298                 /* type of this section */
 299                 avc_bridgeco_fill_unit_addr(addr, dir,
 300                                             AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
 301                 err = avc_bridgeco_get_plug_section_type(bebob->unit, addr,
 302                                                          sec, &type);
 303                 if (err < 0) {
 304                         dev_err(&bebob->unit->device,
 305                         "fail to get section type for isoc %s plug 0: %d\n",
 306                                 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :
 307                                                                     "out",
 308                                 err);
 309                         goto end;
 310                 }
 311                 /* NoType */
 312                 if (type == 0xff) {
 313                         err = -ENOSYS;
 314                         goto end;
 315                 }
 316
 317                 /* the number of channels in this section */
 318                 channels = buf[pos++];
 319
 320                 for (ch = 0; ch < channels; ch++) {
 321                         /* position of this channel in AMDTP packet */
 322                         stm_pos = buf[pos++] - 1;
 323                         /* location of this channel in this section */
 324                         sec_loc = buf[pos++] - 1;
 325
 326                         /*
 327                          * Basically the number of location is within the
 328                          * number of channels in this section. But some models
 329                          * of M-Audio don't follow this. Its location for MIDI
 330                          * is the position of MIDI channels in AMDTP packet.
 331                          */
 332                         if (sec_loc >= channels)
 333                                 sec_loc = ch;
 334
 335                         switch (type) {
 336                         /* for MIDI conformant data channel */
 337                         case 0x0a:
 338                                 /* AMDTP_MAX_CHANNELS_FOR_MIDI is 1. */
 339                                 if ((midi > 0) && (stm_pos != midi)) {
 340                                         err = -ENOSYS;
 341                                         goto end;
 342                                 }
 343                                 amdtp_am824_set_midi_position(s, stm_pos);
 344                                 midi = stm_pos;
 345                                 break;
 346                         /* for PCM data channel */
 347                         case 0x01:      /* Headphone */
 348                         case 0x02:      /* Microphone */
 349                         case 0x03:      /* Line */
 350                         case 0x04:      /* SPDIF */
 351                         case 0x05:      /* ADAT */
 352                         case 0x06:      /* TDIF */
 353                         case 0x07:      /* MADI */
 354                         /* for undefined/changeable signal  */
 355                         case 0x08:      /* Analog */
 356                         case 0x09:      /* Digital */
 357                         default:
 358                                 location = pcm + sec_loc;
 359                                 if (location >= AM824_MAX_CHANNELS_FOR_PCM) {
 360                                         err = -ENOSYS;
 361                                         goto end;
 362                                 }
 363                                 amdtp_am824_set_pcm_position(s, location,
 364                                                              stm_pos);
 365                                 break;
 366                         }
 367                 }
 368
 369                 if (type != 0x0a)
 370                         pcm += channels;
 371                 else
 372                         midi += channels;
 373         }
 374 end:
 375         kfree(buf);
 376         return err;
 377 }
 378
 379 static int
 380 init_both_connections(struct snd_bebob *bebob)
 381 {
 382         int err;
 383
 384         err = cmp_connection_init(&bebob->in_conn,
 385                                   bebob->unit, CMP_INPUT, 0);
 386         if (err < 0)
 387                 goto end;
 388
 389         err = cmp_connection_init(&bebob->out_conn,
 390                                   bebob->unit, CMP_OUTPUT, 0);
 391         if (err < 0)
 392                 cmp_connection_destroy(&bebob->in_conn);
 393 end:
 394         return err;
 395 }
 396
 397 static int
 398 check_connection_used_by_others(struct snd_bebob *bebob, struct amdtp_stream *s)
 399 {
 400         struct cmp_connection *conn;
 401         bool used;
 402         int err;
 403
 404         if (s == &bebob->tx_stream)
 405                 conn = &bebob->out_conn;
 406         else
 407                 conn = &bebob->in_conn;
 408
 409         err = cmp_connection_check_used(conn, &used);
 410         if ((err >= 0) && used && !amdtp_stream_running(s)) {
 411                 dev_err(&bebob->unit->device,
 412                         "Connection established by others: %cPCR[%d]\n",
 413                         (conn->direction == CMP_OUTPUT) ? 'o' : 'i',
 414                         conn->pcr_index);
 415                 err = -EBUSY;
 416         }
 417
 418         return err;
 419 }
 420
 421 static int
 422 make_both_connections(struct snd_bebob *bebob, unsigned int rate)
 423 {
 424         int index, pcm_channels, midi_channels, err = 0;
 425
 426         if (bebob->connected)
 427                 goto end;
 428
 429         /* confirm params for both streams */
 430         err = get_formation_index(rate, &index);
 431         if (err < 0)
 432                 goto end;
 433         pcm_channels = bebob->tx_stream_formations[index].pcm;
 434         midi_channels = bebob->tx_stream_formations[index].midi;
 435         err = amdtp_am824_set_parameters(&bebob->tx_stream, rate,
 436                                          pcm_channels, midi_channels * 8,
 437                                          false);
 438         if (err < 0)
 439                 goto end;
 440
 441         pcm_channels = bebob->rx_stream_formations[index].pcm;
 442         midi_channels = bebob->rx_stream_formations[index].midi;
 443         err = amdtp_am824_set_parameters(&bebob->rx_stream, rate,
 444                                          pcm_channels, midi_channels * 8,
 445                                          false);
 446         if (err < 0)
 447                 goto end;
 448
 449         /* establish connections for both streams */
 450         err = cmp_connection_establish(&bebob->out_conn,
 451                         amdtp_stream_get_max_payload(&bebob->tx_stream));
 452         if (err < 0)
 453                 goto end;
 454         err = cmp_connection_establish(&bebob->in_conn,
 455                         amdtp_stream_get_max_payload(&bebob->rx_stream));
 456         if (err < 0) {
 457                 cmp_connection_break(&bebob->out_conn);
 458                 goto end;
 459         }
 460
 461         bebob->connected = true;
 462 end:
 463         return err;
 464 }
 465
 466 static void
 467 break_both_connections(struct snd_bebob *bebob)
 468 {
 469         cmp_connection_break(&bebob->in_conn);
 470         cmp_connection_break(&bebob->out_conn);
 471
 472         bebob->connected = false;
 473
 474         /* These models seems to be in transition state for a longer time. */
 475         if (bebob->maudio_special_quirk != NULL)
 476                 msleep(200);
 477 }
 478
 479 static void
 480 destroy_both_connections(struct snd_bebob *bebob)
 481 {
 482         cmp_connection_destroy(&bebob->in_conn);
 483         cmp_connection_destroy(&bebob->out_conn);
 484 }
 485
 486 static int
 487 get_sync_mode(struct snd_bebob *bebob, enum cip_flags *sync_mode)
 488 {
 489         enum snd_bebob_clock_type src;
 490         int err;
 491
 492         err = snd_bebob_stream_get_clock_src(bebob, &src);
 493         if (err < 0)
 494                 return err;
 495
 496         switch (src) {
 497         case SND_BEBOB_CLOCK_TYPE_INTERNAL:
 498         case SND_BEBOB_CLOCK_TYPE_EXTERNAL:
 499                 *sync_mode = CIP_SYNC_TO_DEVICE;
 500                 break;
 501         default:
 502         case SND_BEBOB_CLOCK_TYPE_SYT:
 503                 *sync_mode = 0;
 504                 break;
 505         }
 506
 507         return 0;
 508 }
 509
 510 static int
 511 start_stream(struct snd_bebob *bebob, struct amdtp_stream *stream,
 512              unsigned int rate)
 513 {
 514         struct cmp_connection *conn;
 515         int err = 0;
 516
 517         if (stream == &bebob->rx_stream)
 518                 conn = &bebob->in_conn;
 519         else
 520                 conn = &bebob->out_conn;
 521
 522         /* channel mapping */
 523         if (bebob->maudio_special_quirk == NULL) {
 524                 err = map_data_channels(bebob, stream);
 525                 if (err < 0)
 526                         goto end;
 527         }
 528
 529         /* start amdtp stream */
 530         err = amdtp_stream_start(stream,
 531                                  conn->resources.channel,
 532                                  conn->speed);
 533 end:
 534         return err;
 535 }
 536
 537 int snd_bebob_stream_init_duplex(struct snd_bebob *bebob)
 538 {
 539         int err;
 540
 541         err = init_both_connections(bebob);
 542         if (err < 0)
 543                 goto end;
 544
 545         err = amdtp_am824_init(&bebob->tx_stream, bebob->unit,
 546                                AMDTP_IN_STREAM, CIP_BLOCKING);
 547         if (err < 0) {
 548                 amdtp_stream_destroy(&bebob->tx_stream);
 549                 destroy_both_connections(bebob);
 550                 goto end;
 551         }
 552         /* See comments in next function */
 553         init_completion(&bebob->bus_reset);
 554         bebob->tx_stream.flags |= CIP_SKIP_INIT_DBC_CHECK;
 555
 556         /*
 557          * BeBoB v3 transfers packets with these qurks:
 558          *  - In the beginning of streaming, the value of dbc is incremented
 559          *    even if no data blocks are transferred.
 560          *  - The value of dbc is reset suddenly.
 561          */
 562         if (bebob->version > 2)
 563                 bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC |
 564                                           CIP_SKIP_DBC_ZERO_CHECK;
 565
 566         /*
 567          * At high sampling rate, M-Audio special firmware transmits empty
 568          * packet with the value of dbc incremented by 8 but the others are
 569          * valid to IEC 61883-1.
 570          */
 571         if (bebob->maudio_special_quirk)
 572                 bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC;
 573
 574         err = amdtp_am824_init(&bebob->rx_stream, bebob->unit,
 575                                AMDTP_OUT_STREAM, CIP_BLOCKING);
 576         if (err < 0) {
 577                 amdtp_stream_destroy(&bebob->tx_stream);
 578                 amdtp_stream_destroy(&bebob->rx_stream);
 579                 destroy_both_connections(bebob);
 580         }
 581 end:
 582         return err;
 583 }
 584
 585 int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, unsigned int rate)
 586 {
 587         const struct snd_bebob_rate_spec *rate_spec = bebob->spec->rate;
 588         struct amdtp_stream *master, *slave;
 589         enum cip_flags sync_mode;
 590         unsigned int curr_rate;
 591         bool updated = false;
 592         int err = 0;
 593
 594         /*
 595          * Normal BeBoB firmware has a quirk at bus reset to transmits packets
 596          * with discontinuous value in dbc field.
 597          *
 598          * This 'struct completion' is used to call .update() at first to update
 599          * connections/streams. Next following codes handle streaming error.
 600          */
 601         if (amdtp_streaming_error(&bebob->tx_stream)) {
 602                 if (completion_done(&bebob->bus_reset))
 603                         reinit_completion(&bebob->bus_reset);
 604
 605                 updated = (wait_for_completion_interruptible_timeout(
 606                                 &bebob->bus_reset,
 607                                 msecs_to_jiffies(FW_ISO_RESOURCE_DELAY)) > 0);
 608         }
 609
 610         mutex_lock(&bebob->mutex);
 611
 612         /* Need no substreams */
 613         if (atomic_read(&bebob->substreams_counter) == 0)
 614                 goto end;
 615
 616         err = get_sync_mode(bebob, &sync_mode);
 617         if (err < 0)
 618                 goto end;
 619         if (sync_mode == CIP_SYNC_TO_DEVICE) {
 620                 master = &bebob->tx_stream;
 621                 slave  = &bebob->rx_stream;
 622         } else {
 623                 master = &bebob->rx_stream;
 624                 slave  = &bebob->tx_stream;
 625         }
 626
 627         /*
 628          * Considering JACK/FFADO streaming:
 629          * TODO: This can be removed hwdep functionality becomes popular.
 630          */
 631         err = check_connection_used_by_others(bebob, master);
 632         if (err < 0)
 633                 goto end;
 634
 635         /*
 636          * packet queueing error or detecting discontinuity
 637          *
 638          * At bus reset, connections should not be broken here. So streams need
 639          * to be re-started. This is a reason to use SKIP_INIT_DBC_CHECK flag.
 640          */
 641         if (amdtp_streaming_error(master))
 642                 amdtp_stream_stop(master);
 643         if (amdtp_streaming_error(slave))
 644                 amdtp_stream_stop(slave);
 645         if (!updated &&
 646             !amdtp_stream_running(master) && !amdtp_stream_running(slave))
 647                 break_both_connections(bebob);
 648
 649         /* stop streams if rate is different */
 650         err = rate_spec->get(bebob, &curr_rate);
 651         if (err < 0) {
 652                 dev_err(&bebob->unit->device,
 653                         "fail to get sampling rate: %d\n", err);
 654                 goto end;
 655         }
 656         if (rate == 0)
 657                 rate = curr_rate;
 658         if (rate != curr_rate) {
 659                 amdtp_stream_stop(master);
 660                 amdtp_stream_stop(slave);
 661                 break_both_connections(bebob);
 662         }
 663
 664         /* master should be always running */
 665         if (!amdtp_stream_running(master)) {
 666                 amdtp_stream_set_sync(sync_mode, master, slave);
 667                 bebob->master = master;
 668
 669                 /*
 670                  * NOTE:
 671                  * If establishing connections at first, Yamaha GO46
 672                  * (and maybe Terratec X24) don't generate sound.
 673                  *
 674                  * For firmware customized by M-Audio, refer to next NOTE.
 675                  */
 676                 if (bebob->maudio_special_quirk == NULL) {
 677                         err = rate_spec->set(bebob, rate);
 678                         if (err < 0) {
 679                                 dev_err(&bebob->unit->device,
 680                                         "fail to set sampling rate: %d\n",
 681                                         err);
 682                                 goto end;
 683                         }
 684                 }
 685
 686                 err = make_both_connections(bebob, rate);
 687                 if (err < 0)
 688                         goto end;
 689
 690                 err = start_stream(bebob, master, rate);
 691                 if (err < 0) {
 692                         dev_err(&bebob->unit->device,
 693                                 "fail to run AMDTP master stream:%d\n", err);
 694                         break_both_connections(bebob);
 695                         goto end;
 696                 }
 697
 698                 /*
 699                  * NOTE:
 700                  * The firmware customized by M-Audio uses these commands to
 701                  * start transmitting stream. This is not usual way.
 702                  */
 703                 if (bebob->maudio_special_quirk != NULL) {
 704                         err = rate_spec->set(bebob, rate);
 705                         if (err < 0) {
 706                                 dev_err(&bebob->unit->device,
 707                                         "fail to ensure sampling rate: %d\n",
 708                                         err);
 709                                 amdtp_stream_stop(master);
 710                                 break_both_connections(bebob);
 711                                 goto end;
 712                         }
 713                 }
 714
 715                 /* wait first callback */
 716                 if (!amdtp_stream_wait_callback(master, CALLBACK_TIMEOUT)) {
 717                         amdtp_stream_stop(master);
 718                         break_both_connections(bebob);
 719                         err = -ETIMEDOUT;
 720                         goto end;
 721                 }
 722         }
 723
 724         /* start slave if needed */
 725         if (!amdtp_stream_running(slave)) {
 726                 err = start_stream(bebob, slave, rate);
 727                 if (err < 0) {
 728                         dev_err(&bebob->unit->device,
 729                                 "fail to run AMDTP slave stream:%d\n", err);
 730                         amdtp_stream_stop(master);
 731                         break_both_connections(bebob);
 732                         goto end;
 733                 }
 734
 735                 /* wait first callback */
 736                 if (!amdtp_stream_wait_callback(slave, CALLBACK_TIMEOUT)) {
 737                         amdtp_stream_stop(slave);
 738                         amdtp_stream_stop(master);
 739                         break_both_connections(bebob);
 740                         err = -ETIMEDOUT;
 741                 }
 742         }
 743 end:
 744         mutex_unlock(&bebob->mutex);
 745         return err;
 746 }
 747
 748 void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob)
 749 {
 750         struct amdtp_stream *master, *slave;
 751
 752         if (bebob->master == &bebob->rx_stream) {
 753                 slave  = &bebob->tx_stream;
 754                 master = &bebob->rx_stream;
 755         } else {
 756                 slave  = &bebob->rx_stream;
 757                 master = &bebob->tx_stream;
 758         }
 759
 760         mutex_lock(&bebob->mutex);
 761
 762         if (atomic_read(&bebob->substreams_counter) == 0) {
 763                 amdtp_stream_pcm_abort(master);
 764                 amdtp_stream_stop(master);
 765
 766                 amdtp_stream_pcm_abort(slave);
 767                 amdtp_stream_stop(slave);
 768
 769                 break_both_connections(bebob);
 770         }
 771
 772         mutex_unlock(&bebob->mutex);
 773 }
 774
 775 void snd_bebob_stream_update_duplex(struct snd_bebob *bebob)
 776 {
 777         /* vs. XRUN recovery due to discontinuity at bus reset */
 778         mutex_lock(&bebob->mutex);
 779
 780         if ((cmp_connection_update(&bebob->in_conn) < 0) ||
 781             (cmp_connection_update(&bebob->out_conn) < 0)) {
 782                 amdtp_stream_pcm_abort(&bebob->rx_stream);
 783                 amdtp_stream_pcm_abort(&bebob->tx_stream);
 784                 amdtp_stream_stop(&bebob->rx_stream);
 785                 amdtp_stream_stop(&bebob->tx_stream);
 786                 break_both_connections(bebob);
 787         } else {
 788                 amdtp_stream_update(&bebob->rx_stream);
 789                 amdtp_stream_update(&bebob->tx_stream);
 790         }
 791
 792         /* wake up stream_start_duplex() */
 793         if (!completion_done(&bebob->bus_reset))
 794                 complete_all(&bebob->bus_reset);
 795
 796         mutex_unlock(&bebob->mutex);
 797 }
 798
 799 /*
 800  * This function should be called before starting streams or after stopping
 801  * streams.
 802  */
 803 void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob)
 804 {
 805         amdtp_stream_destroy(&bebob->rx_stream);
 806         amdtp_stream_destroy(&bebob->tx_stream);
 807
 808         destroy_both_connections(bebob);
 809 }
 810
 811 /*
 812  * See: Table 50: Extended Stream Format Info Format Hierarchy Level 2’
 813  * in Additional AVC commands (Nov 2003, BridgeCo)
 814  * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
 815  */
 816 static int
 817 parse_stream_formation(u8 *buf, unsigned int len,
 818                        struct snd_bebob_stream_formation *formation)
 819 {
 820         unsigned int i, e, channels, format;
 821
 822         /*
 823          * this module can support a hierarchy combination that:
 824          *  Root:       Audio and Music (0x90)
 825          *  Level 1:    AM824 Compound  (0x40)
 826          */
 827         if ((buf[0] != 0x90) || (buf[1] != 0x40))
 828                 return -ENOSYS;
 829
 830         /* check sampling rate */
 831         for (i = 0; i < ARRAY_SIZE(bridgeco_freq_table); i++) {
 832                 if (buf[2] == bridgeco_freq_table[i])
 833                         break;
 834         }
 835         if (i == ARRAY_SIZE(bridgeco_freq_table))
 836                 return -ENOSYS;
 837
 838         /* Avoid double count by different entries for the same rate. */
 839         memset(&formation[i], 0, sizeof(struct snd_bebob_stream_formation));
 840
 841         for (e = 0; e < buf[4]; e++) {
 842                 channels = buf[5 + e * 2];
 843                 format = buf[6 + e * 2];
 844
 845                 switch (format) {
 846                 /* IEC 60958 Conformant, currently handled as MBLA */
 847                 case 0x00:
 848                 /* Multi bit linear audio */
 849                 case 0x06:      /* Raw */
 850                         formation[i].pcm += channels;
 851                         break;
 852                 /* MIDI Conformant */
 853                 case 0x0d:
 854                         formation[i].midi += channels;
 855                         break;
 856                 /* IEC 61937-3 to 7 */
 857                 case 0x01:
 858                 case 0x02:
 859                 case 0x03:
 860                 case 0x04:
 861                 case 0x05:
 862                 /* Multi bit linear audio */
 863                 case 0x07:      /* DVD-Audio */
 864                 case 0x0c:      /* High Precision */
 865                 /* One Bit Audio */
 866                 case 0x08:      /* (Plain) Raw */
 867                 case 0x09:      /* (Plain) SACD */
 868                 case 0x0a:      /* (Encoded) Raw */
 869                 case 0x0b:      /* (Encoded) SACD */
 870                 /* Synchronization Stream (Stereo Raw audio) */
 871                 case 0x40:
 872                 /* Don't care */
 873                 case 0xff:
 874                 default:
 875                         return -ENOSYS; /* not supported */
 876                 }
 877         }
 878
 879         if (formation[i].pcm  > AM824_MAX_CHANNELS_FOR_PCM ||
 880             formation[i].midi > AM824_MAX_CHANNELS_FOR_MIDI)
 881                 return -ENOSYS;
 882
 883         return 0;
 884 }
 885
 886 static int
 887 fill_stream_formations(struct snd_bebob *bebob, enum avc_bridgeco_plug_dir dir,
 888                        unsigned short pid)
 889 {
 890         u8 *buf;
 891         struct snd_bebob_stream_formation *formations;
 892         unsigned int len, eid;
 893         u8 addr[AVC_BRIDGECO_ADDR_BYTES];
 894         int err;
 895
 896         buf = kmalloc(FORMAT_MAXIMUM_LENGTH, GFP_KERNEL);
 897         if (buf == NULL)
 898                 return -ENOMEM;
 899
 900         if (dir == AVC_BRIDGECO_PLUG_DIR_IN)
 901                 formations = bebob->rx_stream_formations;
 902         else
 903                 formations = bebob->tx_stream_formations;
 904
 905         for (eid = 0; eid < SND_BEBOB_STRM_FMT_ENTRIES; eid++) {
 906                 len = FORMAT_MAXIMUM_LENGTH;
 907                 avc_bridgeco_fill_unit_addr(addr, dir,
 908                                             AVC_BRIDGECO_PLUG_UNIT_ISOC, pid);
 909                 err = avc_bridgeco_get_plug_strm_fmt(bebob->unit, addr, buf,
 910                                                      &len, eid);
 911                 /* No entries remained. */
 912                 if (err == -EINVAL && eid > 0) {
 913                         err = 0;
 914                         break;
 915                 } else if (err < 0) {
 916                         dev_err(&bebob->unit->device,
 917                         "fail to get stream format %d for isoc %s plug %d:%d\n",
 918                                 eid,
 919                                 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :
 920                                                                     "out",
 921                                 pid, err);
 922                         break;
 923                 }
 924
 925                 err = parse_stream_formation(buf, len, formations);
 926                 if (err < 0)
 927                         break;
 928         }
 929
 930         kfree(buf);
 931         return err;
 932 }
 933
 934 static int
 935 seek_msu_sync_input_plug(struct snd_bebob *bebob)
 936 {
 937         u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
 938         unsigned int i;
 939         enum avc_bridgeco_plug_type type;
 940         int err;
 941
 942         /* Get the number of Music Sub Unit for both direction. */
 943         err = avc_general_get_plug_info(bebob->unit, 0x0c, 0x00, 0x00, plugs);
 944         if (err < 0) {
 945                 dev_err(&bebob->unit->device,
 946                         "fail to get info for MSU in/out plugs: %d\n",
 947                         err);
 948                 goto end;
 949         }
 950
 951         /* seek destination plugs for 'MSU sync input' */
 952         bebob->sync_input_plug = -1;
 953         for (i = 0; i < plugs[0]; i++) {
 954                 avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN, 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 MSU in plug %d: %d\n",
 959                                 i, err);
 960                         goto end;
 961                 }
 962
 963                 if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
 964                         bebob->sync_input_plug = i;
 965                         break;
 966                 }
 967         }
 968 end:
 969         return err;
 970 }
 971
 972 int snd_bebob_stream_discover(struct snd_bebob *bebob)
 973 {
 974         const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
 975         u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
 976         enum avc_bridgeco_plug_type type;
 977         unsigned int i;
 978         int err;
 979
 980         /* the number of plugs for isoc in/out, ext in/out  */
 981         err = avc_general_get_plug_info(bebob->unit, 0x1f, 0x07, 0x00, plugs);
 982         if (err < 0) {
 983                 dev_err(&bebob->unit->device,
 984                 "fail to get info for isoc/external in/out plugs: %d\n",
 985                         err);
 986                 goto end;
 987         }
 988
 989         /*
 990          * This module supports at least one isoc input plug and one isoc
 991          * output plug.
 992          */
 993         if ((plugs[0] == 0) || (plugs[1] == 0)) {
 994                 err = -ENOSYS;
 995                 goto end;
 996         }
 997
 998         avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
 999                                     AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
1000         err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
1001         if (err < 0) {
1002                 dev_err(&bebob->unit->device,
1003                         "fail to get type for isoc in plug 0: %d\n", err);
1004                 goto end;
1005         } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
1006                 err = -ENOSYS;
1007                 goto end;
1008         }
1009         err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_IN, 0);
1010         if (err < 0)
1011                 goto end;
1012
1013         avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
1014                                     AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
1015         err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
1016         if (err < 0) {
1017                 dev_err(&bebob->unit->device,
1018                         "fail to get type for isoc out plug 0: %d\n", err);
1019                 goto end;
1020         } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
1021                 err = -ENOSYS;
1022                 goto end;
1023         }
1024         err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_OUT, 0);
1025         if (err < 0)
1026                 goto end;
1027
1028         /* count external input plugs for MIDI */
1029         bebob->midi_input_ports = 0;
1030         for (i = 0; i < plugs[2]; i++) {
1031                 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
1032                                             AVC_BRIDGECO_PLUG_UNIT_EXT, i);
1033                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
1034                 if (err < 0) {
1035                         dev_err(&bebob->unit->device,
1036                         "fail to get type for external in plug %d: %d\n",
1037                                 i, err);
1038                         goto end;
1039                 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
1040                         bebob->midi_input_ports++;
1041                 }
1042         }
1043
1044         /* count external output plugs for MIDI */
1045         bebob->midi_output_ports = 0;
1046         for (i = 0; i < plugs[3]; i++) {
1047                 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
1048                                             AVC_BRIDGECO_PLUG_UNIT_EXT, i);
1049                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
1050                 if (err < 0) {
1051                         dev_err(&bebob->unit->device,
1052                         "fail to get type for external out plug %d: %d\n",
1053                                 i, err);
1054                         goto end;
1055                 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
1056                         bebob->midi_output_ports++;
1057                 }
1058         }
1059
1060         /* for check source of clock later */
1061         if (!clk_spec)
1062                 err = seek_msu_sync_input_plug(bebob);
1063 end:
1064         return err;
1065 }
1066
1067 void snd_bebob_stream_lock_changed(struct snd_bebob *bebob)
1068 {
1069         bebob->dev_lock_changed = true;
1070         wake_up(&bebob->hwdep_wait);
1071 }
1072
1073 int snd_bebob_stream_lock_try(struct snd_bebob *bebob)
1074 {
1075         int err;
1076
1077         spin_lock_irq(&bebob->lock);
1078
1079         /* user land lock this */
1080         if (bebob->dev_lock_count < 0) {
1081                 err = -EBUSY;
1082                 goto end;
1083         }
1084
1085         /* this is the first time */
1086         if (bebob->dev_lock_count++ == 0)
1087                 snd_bebob_stream_lock_changed(bebob);
1088         err = 0;
1089 end:
1090         spin_unlock_irq(&bebob->lock);
1091         return err;
1092 }
1093
1094 void snd_bebob_stream_lock_release(struct snd_bebob *bebob)
1095 {
1096         spin_lock_irq(&bebob->lock);
1097
1098         if (WARN_ON(bebob->dev_lock_count <= 0))
1099                 goto end;
1100         if (--bebob->dev_lock_count == 0)
1101                 snd_bebob_stream_lock_changed(bebob);
1102 end:
1103         spin_unlock_irq(&bebob->lock);
1104 }