997 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * bebob_stream.c - a part of driver for BeBoB based devices4 *5 * Copyright (c) 2013-2014 Takashi Sakamoto6 */7 8#include "./bebob.h"9 10#define READY_TIMEOUT_MS 400011 12/*13 * NOTE;14 * For BeBoB streams, Both of input and output CMP connection are important.15 *16 * For most devices, each CMP connection starts to transmit/receive a17 * corresponding stream. But for a few devices, both of CMP connection needs18 * to start transmitting stream. An example is 'M-Audio Firewire 410'.19 */20 21/* 128 is an arbitrary length but it seems to be enough */22#define FORMAT_MAXIMUM_LENGTH 12823 24const unsigned int snd_bebob_rate_table[SND_BEBOB_STRM_FMT_ENTRIES] = {25 [0] = 32000,26 [1] = 44100,27 [2] = 48000,28 [3] = 88200,29 [4] = 96000,30 [5] = 176400,31 [6] = 192000,32};33 34/*35 * See: Table 51: Extended Stream Format Info ‘Sampling Frequency’36 * in Additional AVC commands (Nov 2003, BridgeCo)37 */38static const unsigned int bridgeco_freq_table[] = {39 [0] = 0x02,40 [1] = 0x03,41 [2] = 0x04,42 [3] = 0x0a,43 [4] = 0x05,44 [5] = 0x06,45 [6] = 0x07,46};47 48static int49get_formation_index(unsigned int rate, unsigned int *index)50{51 unsigned int i;52 53 for (i = 0; i < ARRAY_SIZE(snd_bebob_rate_table); i++) {54 if (snd_bebob_rate_table[i] == rate) {55 *index = i;56 return 0;57 }58 }59 return -EINVAL;60}61 62int63snd_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);91end:92 return err;93}94 95int96snd_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);115end:116 return err;117}118 119int snd_bebob_stream_get_clock_src(struct snd_bebob *bebob,120 enum snd_bebob_clock_type *src)121{122 const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;123 u8 addr[AVC_BRIDGECO_ADDR_BYTES], input[7];124 unsigned int id;125 enum avc_bridgeco_plug_type type;126 int err = 0;127 128 /* 1.The device has its own operation to switch source of clock */129 if (clk_spec) {130 err = clk_spec->get(bebob, &id);131 if (err < 0) {132 dev_err(&bebob->unit->device,133 "fail to get clock source: %d\n", err);134 goto end;135 }136 137 if (id >= clk_spec->num) {138 dev_err(&bebob->unit->device,139 "clock source %d out of range 0..%d\n",140 id, clk_spec->num - 1);141 err = -EIO;142 goto end;143 }144 145 *src = clk_spec->types[id];146 goto end;147 }148 149 /*150 * 2.The device don't support to switch source of clock then assumed151 * to use internal clock always152 */153 if (bebob->sync_input_plug < 0) {154 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;155 goto end;156 }157 158 /*159 * 3.The device supports to switch source of clock by an usual way.160 * Let's check input for 'Music Sub Unit Sync Input' plug.161 */162 avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,163 bebob->sync_input_plug);164 err = avc_bridgeco_get_plug_input(bebob->unit, addr, input);165 if (err < 0) {166 dev_err(&bebob->unit->device,167 "fail to get an input for MSU in plug %d: %d\n",168 bebob->sync_input_plug, err);169 goto end;170 }171 172 /*173 * If there are no input plugs, all of fields are 0xff.174 * Here check the first field. This field is used for direction.175 */176 if (input[0] == 0xff) {177 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;178 goto end;179 }180 181 /* The source from any output plugs is for one purpose only. */182 if (input[0] == AVC_BRIDGECO_PLUG_DIR_OUT) {183 /*184 * In BeBoB architecture, the source from music subunit may185 * bypass from oPCR[0]. This means that this source gives186 * synchronization to IEEE 1394 cycle start packet.187 */188 if (input[1] == AVC_BRIDGECO_PLUG_MODE_SUBUNIT &&189 input[2] == 0x0c) {190 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;191 goto end;192 }193 /* The source from any input units is for several purposes. */194 } else if (input[1] == AVC_BRIDGECO_PLUG_MODE_UNIT) {195 if (input[2] == AVC_BRIDGECO_PLUG_UNIT_ISOC) {196 if (input[3] == 0x00) {197 /*198 * This source comes from iPCR[0]. This means199 * that presentation timestamp calculated by200 * SYT series of the received packets. In201 * short, this driver is the master of202 * synchronization.203 */204 *src = SND_BEBOB_CLOCK_TYPE_SYT;205 goto end;206 } else {207 /*208 * This source comes from iPCR[1-29]. This209 * means that the synchronization stream is not210 * the Audio/MIDI compound stream.211 */212 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;213 goto end;214 }215 } else if (input[2] == AVC_BRIDGECO_PLUG_UNIT_EXT) {216 /* Check type of this plug. */217 avc_bridgeco_fill_unit_addr(addr,218 AVC_BRIDGECO_PLUG_DIR_IN,219 AVC_BRIDGECO_PLUG_UNIT_EXT,220 input[3]);221 err = avc_bridgeco_get_plug_type(bebob->unit, addr,222 &type);223 if (err < 0)224 goto end;225 226 if (type == AVC_BRIDGECO_PLUG_TYPE_DIG) {227 /*228 * SPDIF/ADAT or sometimes (not always) word229 * clock.230 */231 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;232 goto end;233 } else if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {234 /* Often word clock. */235 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;236 goto end;237 } else if (type == AVC_BRIDGECO_PLUG_TYPE_ADDITION) {238 /*239 * Not standard.240 * Mostly, additional internal clock.241 */242 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;243 goto end;244 }245 }246 }247 248 /* Not supported. */249 err = -EIO;250end:251 return err;252}253 254static int map_data_channels(struct snd_bebob *bebob, struct amdtp_stream *s)255{256 unsigned int sec, sections, ch, channels;257 unsigned int pcm, midi, location;258 unsigned int stm_pos, sec_loc, pos;259 u8 *buf, addr[AVC_BRIDGECO_ADDR_BYTES], type;260 enum avc_bridgeco_plug_dir dir;261 int err;262 263 /*264 * The length of return value of this command cannot be expected. Here265 * use the maximum length of FCP.266 */267 buf = kzalloc(256, GFP_KERNEL);268 if (buf == NULL)269 return -ENOMEM;270 271 if (s == &bebob->tx_stream)272 dir = AVC_BRIDGECO_PLUG_DIR_OUT;273 else274 dir = AVC_BRIDGECO_PLUG_DIR_IN;275 276 avc_bridgeco_fill_unit_addr(addr, dir, AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);277 err = avc_bridgeco_get_plug_ch_pos(bebob->unit, addr, buf, 256);278 if (err < 0) {279 dev_err(&bebob->unit->device,280 "fail to get channel position for isoc %s plug 0: %d\n",281 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" : "out",282 err);283 goto end;284 }285 pos = 0;286 287 /* positions in I/O buffer */288 pcm = 0;289 midi = 0;290 291 /* the number of sections in AMDTP packet */292 sections = buf[pos++];293 294 for (sec = 0; sec < sections; sec++) {295 /* type of this section */296 avc_bridgeco_fill_unit_addr(addr, dir,297 AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);298 err = avc_bridgeco_get_plug_section_type(bebob->unit, addr,299 sec, &type);300 if (err < 0) {301 dev_err(&bebob->unit->device,302 "fail to get section type for isoc %s plug 0: %d\n",303 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :304 "out",305 err);306 goto end;307 }308 /* NoType */309 if (type == 0xff) {310 err = -ENOSYS;311 goto end;312 }313 314 /* the number of channels in this section */315 channels = buf[pos++];316 317 for (ch = 0; ch < channels; ch++) {318 /* position of this channel in AMDTP packet */319 stm_pos = buf[pos++] - 1;320 /* location of this channel in this section */321 sec_loc = buf[pos++] - 1;322 323 /*324 * Basically the number of location is within the325 * number of channels in this section. But some models326 * of M-Audio don't follow this. Its location for MIDI327 * is the position of MIDI channels in AMDTP packet.328 */329 if (sec_loc >= channels)330 sec_loc = ch;331 332 switch (type) {333 /* for MIDI conformant data channel */334 case 0x0a:335 /* AMDTP_MAX_CHANNELS_FOR_MIDI is 1. */336 if ((midi > 0) && (stm_pos != midi)) {337 err = -ENOSYS;338 goto end;339 }340 amdtp_am824_set_midi_position(s, stm_pos);341 midi = stm_pos;342 break;343 /* for PCM data channel */344 case 0x01: /* Headphone */345 case 0x02: /* Microphone */346 case 0x03: /* Line */347 case 0x04: /* SPDIF */348 case 0x05: /* ADAT */349 case 0x06: /* TDIF */350 case 0x07: /* MADI */351 /* for undefined/changeable signal */352 case 0x08: /* Analog */353 case 0x09: /* Digital */354 default:355 location = pcm + sec_loc;356 if (location >= AM824_MAX_CHANNELS_FOR_PCM) {357 err = -ENOSYS;358 goto end;359 }360 amdtp_am824_set_pcm_position(s, location,361 stm_pos);362 break;363 }364 }365 366 if (type != 0x0a)367 pcm += channels;368 else369 midi += channels;370 }371end:372 kfree(buf);373 return err;374}375 376static int377check_connection_used_by_others(struct snd_bebob *bebob, struct amdtp_stream *s)378{379 struct cmp_connection *conn;380 bool used;381 int err;382 383 if (s == &bebob->tx_stream)384 conn = &bebob->out_conn;385 else386 conn = &bebob->in_conn;387 388 err = cmp_connection_check_used(conn, &used);389 if ((err >= 0) && used && !amdtp_stream_running(s)) {390 dev_err(&bebob->unit->device,391 "Connection established by others: %cPCR[%d]\n",392 (conn->direction == CMP_OUTPUT) ? 'o' : 'i',393 conn->pcr_index);394 err = -EBUSY;395 }396 397 return err;398}399 400static void break_both_connections(struct snd_bebob *bebob)401{402 cmp_connection_break(&bebob->in_conn);403 cmp_connection_break(&bebob->out_conn);404}405 406static int start_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)407{408 struct cmp_connection *conn;409 int err = 0;410 411 if (stream == &bebob->rx_stream)412 conn = &bebob->in_conn;413 else414 conn = &bebob->out_conn;415 416 // channel mapping.417 if (bebob->maudio_special_quirk == NULL) {418 err = map_data_channels(bebob, stream);419 if (err < 0)420 return err;421 }422 423 err = cmp_connection_establish(conn);424 if (err < 0)425 return err;426 427 return amdtp_domain_add_stream(&bebob->domain, stream,428 conn->resources.channel, conn->speed);429}430 431static int init_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)432{433 unsigned int flags = CIP_BLOCKING;434 enum amdtp_stream_direction dir_stream;435 struct cmp_connection *conn;436 enum cmp_direction dir_conn;437 int err;438 439 if (stream == &bebob->tx_stream) {440 dir_stream = AMDTP_IN_STREAM;441 conn = &bebob->out_conn;442 dir_conn = CMP_OUTPUT;443 } else {444 dir_stream = AMDTP_OUT_STREAM;445 conn = &bebob->in_conn;446 dir_conn = CMP_INPUT;447 }448 449 if (stream == &bebob->tx_stream) {450 if (bebob->quirks & SND_BEBOB_QUIRK_WRONG_DBC)451 flags |= CIP_EMPTY_HAS_WRONG_DBC;452 }453 454 err = cmp_connection_init(conn, bebob->unit, dir_conn, 0);455 if (err < 0)456 return err;457 458 err = amdtp_am824_init(stream, bebob->unit, dir_stream, flags);459 if (err < 0) {460 cmp_connection_destroy(conn);461 return err;462 }463 464 return 0;465}466 467static void destroy_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)468{469 amdtp_stream_destroy(stream);470 471 if (stream == &bebob->tx_stream)472 cmp_connection_destroy(&bebob->out_conn);473 else474 cmp_connection_destroy(&bebob->in_conn);475}476 477int snd_bebob_stream_init_duplex(struct snd_bebob *bebob)478{479 int err;480 481 err = init_stream(bebob, &bebob->tx_stream);482 if (err < 0)483 return err;484 485 err = init_stream(bebob, &bebob->rx_stream);486 if (err < 0) {487 destroy_stream(bebob, &bebob->tx_stream);488 return err;489 }490 491 err = amdtp_domain_init(&bebob->domain);492 if (err < 0) {493 destroy_stream(bebob, &bebob->tx_stream);494 destroy_stream(bebob, &bebob->rx_stream);495 }496 497 return err;498}499 500static int keep_resources(struct snd_bebob *bebob, struct amdtp_stream *stream,501 unsigned int rate, unsigned int index)502{503 unsigned int pcm_channels;504 unsigned int midi_ports;505 struct cmp_connection *conn;506 int err;507 508 if (stream == &bebob->tx_stream) {509 pcm_channels = bebob->tx_stream_formations[index].pcm;510 midi_ports = bebob->midi_input_ports;511 conn = &bebob->out_conn;512 } else {513 pcm_channels = bebob->rx_stream_formations[index].pcm;514 midi_ports = bebob->midi_output_ports;515 conn = &bebob->in_conn;516 }517 518 err = amdtp_am824_set_parameters(stream, rate, pcm_channels, midi_ports, false);519 if (err < 0)520 return err;521 522 return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream));523}524 525int snd_bebob_stream_reserve_duplex(struct snd_bebob *bebob, unsigned int rate,526 unsigned int frames_per_period,527 unsigned int frames_per_buffer)528{529 unsigned int curr_rate;530 int err;531 532 // Considering JACK/FFADO streaming:533 // TODO: This can be removed hwdep functionality becomes popular.534 err = check_connection_used_by_others(bebob, &bebob->rx_stream);535 if (err < 0)536 return err;537 538 err = bebob->spec->rate->get(bebob, &curr_rate);539 if (err < 0)540 return err;541 if (rate == 0)542 rate = curr_rate;543 if (curr_rate != rate) {544 amdtp_domain_stop(&bebob->domain);545 break_both_connections(bebob);546 547 cmp_connection_release(&bebob->out_conn);548 cmp_connection_release(&bebob->in_conn);549 }550 551 if (bebob->substreams_counter == 0 || curr_rate != rate) {552 unsigned int index;553 554 // NOTE:555 // If establishing connections at first, Yamaha GO46556 // (and maybe Terratec X24) don't generate sound.557 //558 // For firmware customized by M-Audio, refer to next NOTE.559 err = bebob->spec->rate->set(bebob, rate);560 if (err < 0) {561 dev_err(&bebob->unit->device,562 "fail to set sampling rate: %d\n",563 err);564 return err;565 }566 567 err = get_formation_index(rate, &index);568 if (err < 0)569 return err;570 571 err = keep_resources(bebob, &bebob->tx_stream, rate, index);572 if (err < 0)573 return err;574 575 err = keep_resources(bebob, &bebob->rx_stream, rate, index);576 if (err < 0) {577 cmp_connection_release(&bebob->out_conn);578 return err;579 }580 581 err = amdtp_domain_set_events_per_period(&bebob->domain,582 frames_per_period, frames_per_buffer);583 if (err < 0) {584 cmp_connection_release(&bebob->out_conn);585 cmp_connection_release(&bebob->in_conn);586 return err;587 }588 }589 590 return 0;591}592 593int snd_bebob_stream_start_duplex(struct snd_bebob *bebob)594{595 int err;596 597 // Need no substreams.598 if (bebob->substreams_counter == 0)599 return -EIO;600 601 // packet queueing error or detecting discontinuity602 if (amdtp_streaming_error(&bebob->rx_stream) ||603 amdtp_streaming_error(&bebob->tx_stream)) {604 amdtp_domain_stop(&bebob->domain);605 break_both_connections(bebob);606 }607 608 if (!amdtp_stream_running(&bebob->rx_stream)) {609 enum snd_bebob_clock_type src;610 unsigned int curr_rate;611 unsigned int tx_init_skip_cycles;612 613 if (bebob->maudio_special_quirk) {614 err = bebob->spec->rate->get(bebob, &curr_rate);615 if (err < 0)616 return err;617 }618 619 err = snd_bebob_stream_get_clock_src(bebob, &src);620 if (err < 0)621 return err;622 623 err = start_stream(bebob, &bebob->rx_stream);624 if (err < 0)625 goto error;626 627 err = start_stream(bebob, &bebob->tx_stream);628 if (err < 0)629 goto error;630 631 if (!(bebob->quirks & SND_BEBOB_QUIRK_INITIAL_DISCONTINUOUS_DBC))632 tx_init_skip_cycles = 0;633 else634 tx_init_skip_cycles = 16000;635 636 // MEMO: Some devices start packet transmission long enough after establishment of637 // CMP connection. In the early stage of packet streaming, any device transfers638 // NODATA packets. After several hundred cycles, it begins to multiplex event into639 // the packet with adequate value of syt field in CIP header. Some devices are640 // strictly to generate any discontinuity in the sequence of tx packet when they641 // receives inadequate sequence of value in syt field of CIP header. In the case,642 // the request to break CMP connection is often corrupted, then any transaction643 // results in unrecoverable error, sometimes generate bus-reset.644 err = amdtp_domain_start(&bebob->domain, tx_init_skip_cycles, true, false);645 if (err < 0)646 goto error;647 648 // NOTE:649 // The firmware customized by M-Audio uses these commands to650 // start transmitting stream. This is not usual way.651 if (bebob->maudio_special_quirk) {652 err = bebob->spec->rate->set(bebob, curr_rate);653 if (err < 0) {654 dev_err(&bebob->unit->device,655 "fail to ensure sampling rate: %d\n",656 err);657 goto error;658 }659 }660 661 // Some devices postpone start of transmission mostly for 1 sec after receives662 // packets firstly.663 if (!amdtp_domain_wait_ready(&bebob->domain, READY_TIMEOUT_MS)) {664 err = -ETIMEDOUT;665 goto error;666 }667 }668 669 return 0;670error:671 amdtp_domain_stop(&bebob->domain);672 break_both_connections(bebob);673 return err;674}675 676void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob)677{678 if (bebob->substreams_counter == 0) {679 amdtp_domain_stop(&bebob->domain);680 break_both_connections(bebob);681 682 cmp_connection_release(&bebob->out_conn);683 cmp_connection_release(&bebob->in_conn);684 }685}686 687/*688 * This function should be called before starting streams or after stopping689 * streams.690 */691void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob)692{693 amdtp_domain_destroy(&bebob->domain);694 695 destroy_stream(bebob, &bebob->tx_stream);696 destroy_stream(bebob, &bebob->rx_stream);697}698 699/*700 * See: Table 50: Extended Stream Format Info Format Hierarchy Level 2’701 * in Additional AVC commands (Nov 2003, BridgeCo)702 * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005703 */704static int705parse_stream_formation(u8 *buf, unsigned int len,706 struct snd_bebob_stream_formation *formation)707{708 unsigned int i, e, channels, format;709 710 /*711 * this module can support a hierarchy combination that:712 * Root: Audio and Music (0x90)713 * Level 1: AM824 Compound (0x40)714 */715 if ((buf[0] != 0x90) || (buf[1] != 0x40))716 return -ENOSYS;717 718 /* check sampling rate */719 for (i = 0; i < ARRAY_SIZE(bridgeco_freq_table); i++) {720 if (buf[2] == bridgeco_freq_table[i])721 break;722 }723 if (i == ARRAY_SIZE(bridgeco_freq_table))724 return -ENOSYS;725 726 /* Avoid double count by different entries for the same rate. */727 memset(&formation[i], 0, sizeof(struct snd_bebob_stream_formation));728 729 for (e = 0; e < buf[4]; e++) {730 channels = buf[5 + e * 2];731 format = buf[6 + e * 2];732 733 switch (format) {734 /* IEC 60958 Conformant, currently handled as MBLA */735 case 0x00:736 /* Multi bit linear audio */737 case 0x06: /* Raw */738 formation[i].pcm += channels;739 break;740 /* MIDI Conformant */741 case 0x0d:742 formation[i].midi += channels;743 break;744 /* IEC 61937-3 to 7 */745 case 0x01:746 case 0x02:747 case 0x03:748 case 0x04:749 case 0x05:750 /* Multi bit linear audio */751 case 0x07: /* DVD-Audio */752 case 0x0c: /* High Precision */753 /* One Bit Audio */754 case 0x08: /* (Plain) Raw */755 case 0x09: /* (Plain) SACD */756 case 0x0a: /* (Encoded) Raw */757 case 0x0b: /* (Encoded) SACD */758 /* Synchronization Stream (Stereo Raw audio) */759 case 0x40:760 /* Don't care */761 case 0xff:762 default:763 return -ENOSYS; /* not supported */764 }765 }766 767 if (formation[i].pcm > AM824_MAX_CHANNELS_FOR_PCM ||768 formation[i].midi > AM824_MAX_CHANNELS_FOR_MIDI)769 return -ENOSYS;770 771 return 0;772}773 774static int fill_stream_formations(struct snd_bebob *bebob, u8 addr[AVC_BRIDGECO_ADDR_BYTES],775 enum avc_bridgeco_plug_dir plug_dir, unsigned int plug_id,776 struct snd_bebob_stream_formation *formations)777{778 enum avc_bridgeco_plug_type plug_type;779 u8 *buf;780 unsigned int len, eid;781 int err;782 783 avc_bridgeco_fill_unit_addr(addr, plug_dir, AVC_BRIDGECO_PLUG_UNIT_ISOC, plug_id);784 785 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &plug_type);786 if (err < 0) {787 dev_err(&bebob->unit->device,788 "Fail to get type for isoc %d plug 0: %d\n", plug_dir, err);789 return err;790 } else if (plug_type != AVC_BRIDGECO_PLUG_TYPE_ISOC)791 return -ENXIO;792 793 buf = kmalloc(FORMAT_MAXIMUM_LENGTH, GFP_KERNEL);794 if (buf == NULL)795 return -ENOMEM;796 797 for (eid = 0; eid < SND_BEBOB_STRM_FMT_ENTRIES; ++eid) {798 avc_bridgeco_fill_unit_addr(addr, plug_dir, AVC_BRIDGECO_PLUG_UNIT_ISOC, plug_id);799 800 len = FORMAT_MAXIMUM_LENGTH;801 err = avc_bridgeco_get_plug_strm_fmt(bebob->unit, addr, buf, &len, eid);802 // No entries remained.803 if (err == -EINVAL && eid > 0) {804 err = 0;805 break;806 } else if (err < 0) {807 dev_err(&bebob->unit->device,808 "fail to get stream format %d for isoc %d plug %d:%d\n",809 eid, plug_dir, plug_id, err);810 break;811 }812 813 err = parse_stream_formation(buf, len, formations);814 if (err < 0)815 break;816 }817 818 kfree(buf);819 return err;820}821 822static int detect_midi_ports(struct snd_bebob *bebob,823 const struct snd_bebob_stream_formation *formats,824 u8 addr[AVC_BRIDGECO_ADDR_BYTES], enum avc_bridgeco_plug_dir plug_dir,825 unsigned int plug_count, unsigned int *midi_ports)826{827 int i;828 int err = 0;829 830 *midi_ports = 0;831 832 /// Detect the number of available MIDI ports when packet has MIDI conformant data channel.833 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; ++i) {834 if (formats[i].midi > 0)835 break;836 }837 if (i >= SND_BEBOB_STRM_FMT_ENTRIES)838 return 0;839 840 for (i = 0; i < plug_count; ++i) {841 enum avc_bridgeco_plug_type plug_type;842 unsigned int ch_count;843 844 avc_bridgeco_fill_unit_addr(addr, plug_dir, AVC_BRIDGECO_PLUG_UNIT_EXT, i);845 846 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &plug_type);847 if (err < 0) {848 dev_err(&bebob->unit->device,849 "fail to get type for external %d plug %d: %d\n",850 plug_dir, i, err);851 break;852 } else if (plug_type != AVC_BRIDGECO_PLUG_TYPE_MIDI) {853 continue;854 }855 856 err = avc_bridgeco_get_plug_ch_count(bebob->unit, addr, &ch_count);857 if (err < 0)858 break;859 // Yamaha GO44, GO46, Terratec Phase 24, Phase x24 reports 0 for the number of860 // channels in external output plug 3 (MIDI type) even if it has a pair of physical861 // MIDI jacks. As a workaround, assume it as one.862 if (ch_count == 0)863 ch_count = 1;864 *midi_ports += ch_count;865 }866 867 return err;868}869 870static int871seek_msu_sync_input_plug(struct snd_bebob *bebob)872{873 u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];874 unsigned int i;875 enum avc_bridgeco_plug_type type;876 int err;877 878 /* Get the number of Music Sub Unit for both direction. */879 err = avc_general_get_plug_info(bebob->unit, 0x0c, 0x00, 0x00, plugs);880 if (err < 0) {881 dev_err(&bebob->unit->device,882 "fail to get info for MSU in/out plugs: %d\n",883 err);884 goto end;885 }886 887 /* seek destination plugs for 'MSU sync input' */888 bebob->sync_input_plug = -1;889 for (i = 0; i < plugs[0]; i++) {890 avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN, i);891 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);892 if (err < 0) {893 dev_err(&bebob->unit->device,894 "fail to get type for MSU in plug %d: %d\n",895 i, err);896 goto end;897 }898 899 if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {900 bebob->sync_input_plug = i;901 break;902 }903 }904end:905 return err;906}907 908int snd_bebob_stream_discover(struct snd_bebob *bebob)909{910 const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;911 u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];912 int err;913 914 /* the number of plugs for isoc in/out, ext in/out */915 err = avc_general_get_plug_info(bebob->unit, 0x1f, 0x07, 0x00, plugs);916 if (err < 0) {917 dev_err(&bebob->unit->device,918 "fail to get info for isoc/external in/out plugs: %d\n",919 err);920 goto end;921 }922 923 /*924 * This module supports at least one isoc input plug and one isoc925 * output plug.926 */927 if ((plugs[0] == 0) || (plugs[1] == 0)) {928 err = -ENOSYS;929 goto end;930 }931 932 err = fill_stream_formations(bebob, addr, AVC_BRIDGECO_PLUG_DIR_IN, 0,933 bebob->rx_stream_formations);934 if (err < 0)935 goto end;936 937 err = fill_stream_formations(bebob, addr, AVC_BRIDGECO_PLUG_DIR_OUT, 0,938 bebob->tx_stream_formations);939 if (err < 0)940 goto end;941 942 err = detect_midi_ports(bebob, bebob->tx_stream_formations, addr, AVC_BRIDGECO_PLUG_DIR_IN,943 plugs[2], &bebob->midi_input_ports);944 if (err < 0)945 goto end;946 947 err = detect_midi_ports(bebob, bebob->rx_stream_formations, addr, AVC_BRIDGECO_PLUG_DIR_OUT,948 plugs[3], &bebob->midi_output_ports);949 if (err < 0)950 goto end;951 952 /* for check source of clock later */953 if (!clk_spec)954 err = seek_msu_sync_input_plug(bebob);955end:956 return err;957}958 959void snd_bebob_stream_lock_changed(struct snd_bebob *bebob)960{961 bebob->dev_lock_changed = true;962 wake_up(&bebob->hwdep_wait);963}964 965int snd_bebob_stream_lock_try(struct snd_bebob *bebob)966{967 int err;968 969 spin_lock_irq(&bebob->lock);970 971 /* user land lock this */972 if (bebob->dev_lock_count < 0) {973 err = -EBUSY;974 goto end;975 }976 977 /* this is the first time */978 if (bebob->dev_lock_count++ == 0)979 snd_bebob_stream_lock_changed(bebob);980 err = 0;981end:982 spin_unlock_irq(&bebob->lock);983 return err;984}985 986void snd_bebob_stream_lock_release(struct snd_bebob *bebob)987{988 spin_lock_irq(&bebob->lock);989 990 if (WARN_ON(bebob->dev_lock_count <= 0))991 goto end;992 if (--bebob->dev_lock_count == 0)993 snd_bebob_stream_lock_changed(bebob);994end:995 spin_unlock_irq(&bebob->lock);996}997