1 // SPDX-License-Identifier: GPL-2.0-only
3 * bebob_stream.c - a part of driver for BeBoB based devices
5 * Copyright (c) 2013-2014 Takashi Sakamoto
10 #define READY_TIMEOUT_MS 2500
14 * For BeBoB streams, Both of input and output CMP connection are important.
16 * For most devices, each CMP connection starts to transmit/receive a
17 * corresponding stream. But for a few devices, both of CMP connection needs
18 * to start transmitting stream. An example is 'M-Audio Firewire 410'.
21 /* 128 is an arbitrary length but it seems to be enough */
22 #define FORMAT_MAXIMUM_LENGTH 128
24 const unsigned int snd_bebob_rate_table[SND_BEBOB_STRM_FMT_ENTRIES] = {
35 * See: Table 51: Extended Stream Format Info ‘Sampling Frequency’
36 * in Additional AVC commands (Nov 2003, BridgeCo)
38 static const unsigned int bridgeco_freq_table[] = {
49 get_formation_index(unsigned int rate, unsigned int *index)
53 for (i = 0; i < ARRAY_SIZE(snd_bebob_rate_table); i++) {
54 if (snd_bebob_rate_table[i] == rate) {
63 snd_bebob_stream_get_rate(struct snd_bebob *bebob, unsigned int *curr_rate)
65 unsigned int tx_rate, rx_rate, trials;
70 err = avc_general_get_sig_fmt(bebob->unit, &tx_rate,
71 AVC_GENERAL_PLUG_DIR_OUT, 0);
72 } while (err == -EAGAIN && ++trials < 3);
78 err = avc_general_get_sig_fmt(bebob->unit, &rx_rate,
79 AVC_GENERAL_PLUG_DIR_IN, 0);
80 } while (err == -EAGAIN && ++trials < 3);
85 if (rx_rate == tx_rate)
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);
96 snd_bebob_stream_set_rate(struct snd_bebob *bebob, unsigned int rate)
100 err = avc_general_set_sig_fmt(bebob->unit, rate,
101 AVC_GENERAL_PLUG_DIR_OUT, 0);
105 err = avc_general_set_sig_fmt(bebob->unit, rate,
106 AVC_GENERAL_PLUG_DIR_IN, 0);
111 * Some devices need a bit time for transition.
112 * 300msec is got by some experiments.
119 int snd_bebob_stream_get_clock_src(struct snd_bebob *bebob,
120 enum snd_bebob_clock_type *src)
122 const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
123 u8 addr[AVC_BRIDGECO_ADDR_BYTES], input[7];
125 enum avc_bridgeco_plug_type type;
128 /* 1.The device has its own operation to switch source of clock */
130 err = clk_spec->get(bebob, &id);
132 dev_err(&bebob->unit->device,
133 "fail to get clock source: %d\n", err);
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);
145 *src = clk_spec->types[id];
150 * 2.The device don't support to switch source of clock then assumed
151 * to use internal clock always
153 if (bebob->sync_input_plug < 0) {
154 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
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.
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);
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);
173 * If there are no input plugs, all of fields are 0xff.
174 * Here check the first field. This field is used for direction.
176 if (input[0] == 0xff) {
177 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
181 /* The source from any output plugs is for one purpose only. */
182 if (input[0] == AVC_BRIDGECO_PLUG_DIR_OUT) {
184 * In BeBoB architecture, the source from music subunit may
185 * bypass from oPCR[0]. This means that this source gives
186 * synchronization to IEEE 1394 cycle start packet.
188 if (input[1] == AVC_BRIDGECO_PLUG_MODE_SUBUNIT &&
190 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
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) {
198 * This source comes from iPCR[0]. This means
199 * that presentation timestamp calculated by
200 * SYT series of the received packets. In
201 * short, this driver is the master of
204 *src = SND_BEBOB_CLOCK_TYPE_SYT;
208 * This source comes from iPCR[1-29]. This
209 * means that the synchronization stream is not
210 * the Audio/MIDI compound stream.
212 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
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,
221 err = avc_bridgeco_get_plug_type(bebob->unit, addr,
226 if (type == AVC_BRIDGECO_PLUG_TYPE_DIG) {
228 * SPDIF/ADAT or sometimes (not always) word
231 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
233 } else if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
234 /* Often word clock. */
235 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
237 } else if (type == AVC_BRIDGECO_PLUG_TYPE_ADDITION) {
240 * Mostly, additional internal clock.
242 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
254 static int map_data_channels(struct snd_bebob *bebob, struct amdtp_stream *s)
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;
264 * The length of return value of this command cannot be expected. Here
265 * use the maximum length of FCP.
267 buf = kzalloc(256, GFP_KERNEL);
271 if (s == &bebob->tx_stream)
272 dir = AVC_BRIDGECO_PLUG_DIR_OUT;
274 dir = AVC_BRIDGECO_PLUG_DIR_IN;
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);
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",
287 /* positions in I/O buffer */
291 /* the number of sections in AMDTP packet */
292 sections = buf[pos++];
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,
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" :
314 /* the number of channels in this section */
315 channels = buf[pos++];
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;
324 * Basically the number of location is within the
325 * number of channels in this section. But some models
326 * of M-Audio don't follow this. Its location for MIDI
327 * is the position of MIDI channels in AMDTP packet.
329 if (sec_loc >= channels)
333 /* for MIDI conformant data channel */
335 /* AMDTP_MAX_CHANNELS_FOR_MIDI is 1. */
336 if ((midi > 0) && (stm_pos != midi)) {
340 amdtp_am824_set_midi_position(s, stm_pos);
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 */
355 location = pcm + sec_loc;
356 if (location >= AM824_MAX_CHANNELS_FOR_PCM) {
360 amdtp_am824_set_pcm_position(s, location,
377 check_connection_used_by_others(struct snd_bebob *bebob, struct amdtp_stream *s)
379 struct cmp_connection *conn;
383 if (s == &bebob->tx_stream)
384 conn = &bebob->out_conn;
386 conn = &bebob->in_conn;
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',
400 static void break_both_connections(struct snd_bebob *bebob)
402 cmp_connection_break(&bebob->in_conn);
403 cmp_connection_break(&bebob->out_conn);
405 // These models seem to be in transition state for a longer time. When
406 // accessing in the state, any transactions is corrupted. In the worst
407 // case, the device is going to reboot.
408 if (bebob->version < 2)
412 static int start_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
414 struct cmp_connection *conn;
417 if (stream == &bebob->rx_stream)
418 conn = &bebob->in_conn;
420 conn = &bebob->out_conn;
423 if (bebob->maudio_special_quirk == NULL) {
424 err = map_data_channels(bebob, stream);
429 err = cmp_connection_establish(conn);
433 return amdtp_domain_add_stream(&bebob->domain, stream,
434 conn->resources.channel, conn->speed);
437 static int init_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
439 enum amdtp_stream_direction dir_stream;
440 struct cmp_connection *conn;
441 enum cmp_direction dir_conn;
444 if (stream == &bebob->tx_stream) {
445 dir_stream = AMDTP_IN_STREAM;
446 conn = &bebob->out_conn;
447 dir_conn = CMP_OUTPUT;
449 dir_stream = AMDTP_OUT_STREAM;
450 conn = &bebob->in_conn;
451 dir_conn = CMP_INPUT;
454 err = cmp_connection_init(conn, bebob->unit, dir_conn, 0);
458 err = amdtp_am824_init(stream, bebob->unit, dir_stream, CIP_BLOCKING);
460 cmp_connection_destroy(conn);
464 if (stream == &bebob->tx_stream) {
465 // BeBoB v3 transfers packets with these qurks:
466 // - In the beginning of streaming, the value of dbc is
467 // incremented even if no data blocks are transferred.
468 // - The value of dbc is reset suddenly.
469 if (bebob->version > 2)
470 bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC |
471 CIP_SKIP_DBC_ZERO_CHECK;
473 // At high sampling rate, M-Audio special firmware transmits
474 // empty packet with the value of dbc incremented by 8 but the
475 // others are valid to IEC 61883-1.
476 if (bebob->maudio_special_quirk)
477 bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC;
483 static void destroy_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
485 amdtp_stream_destroy(stream);
487 if (stream == &bebob->tx_stream)
488 cmp_connection_destroy(&bebob->out_conn);
490 cmp_connection_destroy(&bebob->in_conn);
493 int snd_bebob_stream_init_duplex(struct snd_bebob *bebob)
497 err = init_stream(bebob, &bebob->tx_stream);
501 err = init_stream(bebob, &bebob->rx_stream);
503 destroy_stream(bebob, &bebob->tx_stream);
507 err = amdtp_domain_init(&bebob->domain);
509 destroy_stream(bebob, &bebob->tx_stream);
510 destroy_stream(bebob, &bebob->rx_stream);
516 static int keep_resources(struct snd_bebob *bebob, struct amdtp_stream *stream,
517 unsigned int rate, unsigned int index)
519 unsigned int pcm_channels;
520 unsigned int midi_ports;
521 struct cmp_connection *conn;
524 if (stream == &bebob->tx_stream) {
525 pcm_channels = bebob->tx_stream_formations[index].pcm;
526 midi_ports = bebob->midi_input_ports;
527 conn = &bebob->out_conn;
529 pcm_channels = bebob->rx_stream_formations[index].pcm;
530 midi_ports = bebob->midi_output_ports;
531 conn = &bebob->in_conn;
534 err = amdtp_am824_set_parameters(stream, rate, pcm_channels, midi_ports, false);
538 return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream));
541 int snd_bebob_stream_reserve_duplex(struct snd_bebob *bebob, unsigned int rate,
542 unsigned int frames_per_period,
543 unsigned int frames_per_buffer)
545 unsigned int curr_rate;
548 // Considering JACK/FFADO streaming:
549 // TODO: This can be removed hwdep functionality becomes popular.
550 err = check_connection_used_by_others(bebob, &bebob->rx_stream);
554 err = bebob->spec->rate->get(bebob, &curr_rate);
559 if (curr_rate != rate) {
560 amdtp_domain_stop(&bebob->domain);
561 break_both_connections(bebob);
563 cmp_connection_release(&bebob->out_conn);
564 cmp_connection_release(&bebob->in_conn);
567 if (bebob->substreams_counter == 0 || curr_rate != rate) {
571 // If establishing connections at first, Yamaha GO46
572 // (and maybe Terratec X24) don't generate sound.
574 // For firmware customized by M-Audio, refer to next NOTE.
575 err = bebob->spec->rate->set(bebob, rate);
577 dev_err(&bebob->unit->device,
578 "fail to set sampling rate: %d\n",
583 err = get_formation_index(rate, &index);
587 err = keep_resources(bebob, &bebob->tx_stream, rate, index);
591 err = keep_resources(bebob, &bebob->rx_stream, rate, index);
593 cmp_connection_release(&bebob->out_conn);
597 err = amdtp_domain_set_events_per_period(&bebob->domain,
598 frames_per_period, frames_per_buffer);
600 cmp_connection_release(&bebob->out_conn);
601 cmp_connection_release(&bebob->in_conn);
609 int snd_bebob_stream_start_duplex(struct snd_bebob *bebob)
613 // Need no substreams.
614 if (bebob->substreams_counter == 0)
617 // packet queueing error or detecting discontinuity
618 if (amdtp_streaming_error(&bebob->rx_stream) ||
619 amdtp_streaming_error(&bebob->tx_stream)) {
620 amdtp_domain_stop(&bebob->domain);
621 break_both_connections(bebob);
624 if (!amdtp_stream_running(&bebob->rx_stream)) {
625 enum snd_bebob_clock_type src;
626 struct amdtp_stream *master, *slave;
627 unsigned int curr_rate;
628 unsigned int tx_init_skip_cycles;
630 if (bebob->maudio_special_quirk) {
631 err = bebob->spec->rate->get(bebob, &curr_rate);
636 err = snd_bebob_stream_get_clock_src(bebob, &src);
640 if (src != SND_BEBOB_CLOCK_TYPE_SYT) {
641 master = &bebob->tx_stream;
642 slave = &bebob->rx_stream;
644 master = &bebob->rx_stream;
645 slave = &bebob->tx_stream;
648 err = start_stream(bebob, master);
652 err = start_stream(bebob, slave);
656 // Some devices transfer isoc packets with discontinuous counter in the beginning
657 // of packet streaming.
658 if (bebob->version < 2)
659 tx_init_skip_cycles = 3200;
661 tx_init_skip_cycles = 16000;
662 err = amdtp_domain_start(&bebob->domain, tx_init_skip_cycles);
667 // The firmware customized by M-Audio uses these commands to
668 // start transmitting stream. This is not usual way.
669 if (bebob->maudio_special_quirk) {
670 err = bebob->spec->rate->set(bebob, curr_rate);
672 dev_err(&bebob->unit->device,
673 "fail to ensure sampling rate: %d\n",
679 // Some devices postpone start of transmission mostly for 1 sec after receives
681 if (!amdtp_domain_wait_ready(&bebob->domain, READY_TIMEOUT_MS)) {
689 amdtp_domain_stop(&bebob->domain);
690 break_both_connections(bebob);
694 void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob)
696 if (bebob->substreams_counter == 0) {
697 amdtp_domain_stop(&bebob->domain);
698 break_both_connections(bebob);
700 cmp_connection_release(&bebob->out_conn);
701 cmp_connection_release(&bebob->in_conn);
706 * This function should be called before starting streams or after stopping
709 void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob)
711 amdtp_domain_destroy(&bebob->domain);
713 destroy_stream(bebob, &bebob->tx_stream);
714 destroy_stream(bebob, &bebob->rx_stream);
718 * See: Table 50: Extended Stream Format Info Format Hierarchy Level 2’
719 * in Additional AVC commands (Nov 2003, BridgeCo)
720 * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
723 parse_stream_formation(u8 *buf, unsigned int len,
724 struct snd_bebob_stream_formation *formation)
726 unsigned int i, e, channels, format;
729 * this module can support a hierarchy combination that:
730 * Root: Audio and Music (0x90)
731 * Level 1: AM824 Compound (0x40)
733 if ((buf[0] != 0x90) || (buf[1] != 0x40))
736 /* check sampling rate */
737 for (i = 0; i < ARRAY_SIZE(bridgeco_freq_table); i++) {
738 if (buf[2] == bridgeco_freq_table[i])
741 if (i == ARRAY_SIZE(bridgeco_freq_table))
744 /* Avoid double count by different entries for the same rate. */
745 memset(&formation[i], 0, sizeof(struct snd_bebob_stream_formation));
747 for (e = 0; e < buf[4]; e++) {
748 channels = buf[5 + e * 2];
749 format = buf[6 + e * 2];
752 /* IEC 60958 Conformant, currently handled as MBLA */
754 /* Multi bit linear audio */
756 formation[i].pcm += channels;
758 /* MIDI Conformant */
760 formation[i].midi += channels;
762 /* IEC 61937-3 to 7 */
768 /* Multi bit linear audio */
769 case 0x07: /* DVD-Audio */
770 case 0x0c: /* High Precision */
772 case 0x08: /* (Plain) Raw */
773 case 0x09: /* (Plain) SACD */
774 case 0x0a: /* (Encoded) Raw */
775 case 0x0b: /* (Encoded) SACD */
776 /* Synchronization Stream (Stereo Raw audio) */
781 return -ENOSYS; /* not supported */
785 if (formation[i].pcm > AM824_MAX_CHANNELS_FOR_PCM ||
786 formation[i].midi > AM824_MAX_CHANNELS_FOR_MIDI)
792 static int fill_stream_formations(struct snd_bebob *bebob, u8 addr[AVC_BRIDGECO_ADDR_BYTES],
793 enum avc_bridgeco_plug_dir plug_dir, unsigned int plug_id,
794 struct snd_bebob_stream_formation *formations)
796 enum avc_bridgeco_plug_type plug_type;
798 unsigned int len, eid;
801 avc_bridgeco_fill_unit_addr(addr, plug_dir, AVC_BRIDGECO_PLUG_UNIT_ISOC, plug_id);
803 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &plug_type);
805 dev_err(&bebob->unit->device,
806 "Fail to get type for isoc %d plug 0: %d\n", plug_dir, err);
808 } else if (plug_type != AVC_BRIDGECO_PLUG_TYPE_ISOC)
811 buf = kmalloc(FORMAT_MAXIMUM_LENGTH, GFP_KERNEL);
815 for (eid = 0; eid < SND_BEBOB_STRM_FMT_ENTRIES; ++eid) {
816 avc_bridgeco_fill_unit_addr(addr, plug_dir, AVC_BRIDGECO_PLUG_UNIT_ISOC, plug_id);
818 len = FORMAT_MAXIMUM_LENGTH;
819 err = avc_bridgeco_get_plug_strm_fmt(bebob->unit, addr, buf, &len, eid);
820 // No entries remained.
821 if (err == -EINVAL && eid > 0) {
824 } else if (err < 0) {
825 dev_err(&bebob->unit->device,
826 "fail to get stream format %d for isoc %d plug %d:%d\n",
827 eid, plug_dir, plug_id, err);
831 err = parse_stream_formation(buf, len, formations);
840 static int detect_midi_ports(struct snd_bebob *bebob,
841 const struct snd_bebob_stream_formation *formats,
842 u8 addr[AVC_BRIDGECO_ADDR_BYTES], enum avc_bridgeco_plug_dir plug_dir,
843 unsigned int plug_count, unsigned int *midi_ports)
850 /// Detect the number of available MIDI ports when packet has MIDI conformant data channel.
851 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; ++i) {
852 if (formats[i].midi > 0)
855 if (i >= SND_BEBOB_STRM_FMT_ENTRIES)
858 for (i = 0; i < plug_count; ++i) {
859 enum avc_bridgeco_plug_type plug_type;
860 unsigned int ch_count;
862 avc_bridgeco_fill_unit_addr(addr, plug_dir, AVC_BRIDGECO_PLUG_UNIT_EXT, i);
864 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &plug_type);
866 dev_err(&bebob->unit->device,
867 "fail to get type for external %d plug %d: %d\n",
870 } else if (plug_type != AVC_BRIDGECO_PLUG_TYPE_MIDI) {
874 err = avc_bridgeco_get_plug_ch_count(bebob->unit, addr, &ch_count);
877 *midi_ports += ch_count;
884 seek_msu_sync_input_plug(struct snd_bebob *bebob)
886 u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
888 enum avc_bridgeco_plug_type type;
891 /* Get the number of Music Sub Unit for both direction. */
892 err = avc_general_get_plug_info(bebob->unit, 0x0c, 0x00, 0x00, plugs);
894 dev_err(&bebob->unit->device,
895 "fail to get info for MSU in/out plugs: %d\n",
900 /* seek destination plugs for 'MSU sync input' */
901 bebob->sync_input_plug = -1;
902 for (i = 0; i < plugs[0]; i++) {
903 avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN, i);
904 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
906 dev_err(&bebob->unit->device,
907 "fail to get type for MSU in plug %d: %d\n",
912 if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
913 bebob->sync_input_plug = i;
921 int snd_bebob_stream_discover(struct snd_bebob *bebob)
923 const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
924 u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
927 /* the number of plugs for isoc in/out, ext in/out */
928 err = avc_general_get_plug_info(bebob->unit, 0x1f, 0x07, 0x00, plugs);
930 dev_err(&bebob->unit->device,
931 "fail to get info for isoc/external in/out plugs: %d\n",
937 * This module supports at least one isoc input plug and one isoc
940 if ((plugs[0] == 0) || (plugs[1] == 0)) {
945 err = fill_stream_formations(bebob, addr, AVC_BRIDGECO_PLUG_DIR_IN, 0,
946 bebob->rx_stream_formations);
950 err = fill_stream_formations(bebob, addr, AVC_BRIDGECO_PLUG_DIR_OUT, 0,
951 bebob->tx_stream_formations);
955 err = detect_midi_ports(bebob, bebob->rx_stream_formations, addr, AVC_BRIDGECO_PLUG_DIR_IN,
956 plugs[2], &bebob->midi_input_ports);
960 err = detect_midi_ports(bebob, bebob->tx_stream_formations, addr, AVC_BRIDGECO_PLUG_DIR_OUT,
961 plugs[3], &bebob->midi_output_ports);
965 /* for check source of clock later */
967 err = seek_msu_sync_input_plug(bebob);
972 void snd_bebob_stream_lock_changed(struct snd_bebob *bebob)
974 bebob->dev_lock_changed = true;
975 wake_up(&bebob->hwdep_wait);
978 int snd_bebob_stream_lock_try(struct snd_bebob *bebob)
982 spin_lock_irq(&bebob->lock);
984 /* user land lock this */
985 if (bebob->dev_lock_count < 0) {
990 /* this is the first time */
991 if (bebob->dev_lock_count++ == 0)
992 snd_bebob_stream_lock_changed(bebob);
995 spin_unlock_irq(&bebob->lock);
999 void snd_bebob_stream_lock_release(struct snd_bebob *bebob)
1001 spin_lock_irq(&bebob->lock);
1003 if (WARN_ON(bebob->dev_lock_count <= 0))
1005 if (--bebob->dev_lock_count == 0)
1006 snd_bebob_stream_lock_changed(bebob);
1008 spin_unlock_irq(&bebob->lock);