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Linux/sound/firewire/bebob/bebob_stream.c

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  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 start_stream(struct snd_bebob *bebob, struct amdtp_stream *stream,
488              unsigned int rate)
489 {
490         struct cmp_connection *conn;
491         int err = 0;
492 
493         if (stream == &bebob->rx_stream)
494                 conn = &bebob->in_conn;
495         else
496                 conn = &bebob->out_conn;
497 
498         /* channel mapping */
499         if (bebob->maudio_special_quirk == NULL) {
500                 err = map_data_channels(bebob, stream);
501                 if (err < 0)
502                         goto end;
503         }
504 
505         /* start amdtp stream */
506         err = amdtp_stream_start(stream,
507                                  conn->resources.channel,
508                                  conn->speed);
509 end:
510         return err;
511 }
512 
513 int snd_bebob_stream_init_duplex(struct snd_bebob *bebob)
514 {
515         int err;
516 
517         err = init_both_connections(bebob);
518         if (err < 0)
519                 goto end;
520 
521         err = amdtp_am824_init(&bebob->tx_stream, bebob->unit,
522                                AMDTP_IN_STREAM, CIP_BLOCKING);
523         if (err < 0) {
524                 amdtp_stream_destroy(&bebob->tx_stream);
525                 destroy_both_connections(bebob);
526                 goto end;
527         }
528 
529         /*
530          * BeBoB v3 transfers packets with these qurks:
531          *  - In the beginning of streaming, the value of dbc is incremented
532          *    even if no data blocks are transferred.
533          *  - The value of dbc is reset suddenly.
534          */
535         if (bebob->version > 2)
536                 bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC |
537                                           CIP_SKIP_DBC_ZERO_CHECK;
538 
539         /*
540          * At high sampling rate, M-Audio special firmware transmits empty
541          * packet with the value of dbc incremented by 8 but the others are
542          * valid to IEC 61883-1.
543          */
544         if (bebob->maudio_special_quirk)
545                 bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC;
546 
547         err = amdtp_am824_init(&bebob->rx_stream, bebob->unit,
548                                AMDTP_OUT_STREAM, CIP_BLOCKING);
549         if (err < 0) {
550                 amdtp_stream_destroy(&bebob->tx_stream);
551                 amdtp_stream_destroy(&bebob->rx_stream);
552                 destroy_both_connections(bebob);
553         }
554 end:
555         return err;
556 }
557 
558 int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, unsigned int rate)
559 {
560         const struct snd_bebob_rate_spec *rate_spec = bebob->spec->rate;
561         unsigned int curr_rate;
562         int err = 0;
563 
564         /* Need no substreams */
565         if (bebob->substreams_counter == 0)
566                 goto end;
567 
568         /*
569          * Considering JACK/FFADO streaming:
570          * TODO: This can be removed hwdep functionality becomes popular.
571          */
572         err = check_connection_used_by_others(bebob, &bebob->rx_stream);
573         if (err < 0)
574                 goto end;
575 
576         /*
577          * packet queueing error or detecting discontinuity
578          *
579          * At bus reset, connections should not be broken here. So streams need
580          * to be re-started. This is a reason to use SKIP_INIT_DBC_CHECK flag.
581          */
582         if (amdtp_streaming_error(&bebob->rx_stream))
583                 amdtp_stream_stop(&bebob->rx_stream);
584         if (amdtp_streaming_error(&bebob->tx_stream))
585                 amdtp_stream_stop(&bebob->tx_stream);
586         if (!amdtp_stream_running(&bebob->rx_stream) &&
587             !amdtp_stream_running(&bebob->tx_stream))
588                 break_both_connections(bebob);
589 
590         /* stop streams if rate is different */
591         err = rate_spec->get(bebob, &curr_rate);
592         if (err < 0) {
593                 dev_err(&bebob->unit->device,
594                         "fail to get sampling rate: %d\n", err);
595                 goto end;
596         }
597         if (rate == 0)
598                 rate = curr_rate;
599         if (rate != curr_rate) {
600                 amdtp_stream_stop(&bebob->rx_stream);
601                 amdtp_stream_stop(&bebob->tx_stream);
602                 break_both_connections(bebob);
603         }
604 
605         /* master should be always running */
606         if (!amdtp_stream_running(&bebob->rx_stream)) {
607                 /*
608                  * NOTE:
609                  * If establishing connections at first, Yamaha GO46
610                  * (and maybe Terratec X24) don't generate sound.
611                  *
612                  * For firmware customized by M-Audio, refer to next NOTE.
613                  */
614                 if (bebob->maudio_special_quirk == NULL) {
615                         err = rate_spec->set(bebob, rate);
616                         if (err < 0) {
617                                 dev_err(&bebob->unit->device,
618                                         "fail to set sampling rate: %d\n",
619                                         err);
620                                 goto end;
621                         }
622                 }
623 
624                 err = make_both_connections(bebob, rate);
625                 if (err < 0)
626                         goto end;
627 
628                 err = start_stream(bebob, &bebob->rx_stream, rate);
629                 if (err < 0) {
630                         dev_err(&bebob->unit->device,
631                                 "fail to run AMDTP master stream:%d\n", err);
632                         break_both_connections(bebob);
633                         goto end;
634                 }
635 
636                 /*
637                  * NOTE:
638                  * The firmware customized by M-Audio uses these commands to
639                  * start transmitting stream. This is not usual way.
640                  */
641                 if (bebob->maudio_special_quirk != NULL) {
642                         err = rate_spec->set(bebob, rate);
643                         if (err < 0) {
644                                 dev_err(&bebob->unit->device,
645                                         "fail to ensure sampling rate: %d\n",
646                                         err);
647                                 amdtp_stream_stop(&bebob->rx_stream);
648                                 break_both_connections(bebob);
649                                 goto end;
650                         }
651                 }
652 
653                 /* wait first callback */
654                 if (!amdtp_stream_wait_callback(&bebob->rx_stream,
655                                                 CALLBACK_TIMEOUT)) {
656                         amdtp_stream_stop(&bebob->rx_stream);
657                         break_both_connections(bebob);
658                         err = -ETIMEDOUT;
659                         goto end;
660                 }
661         }
662 
663         /* start slave if needed */
664         if (!amdtp_stream_running(&bebob->tx_stream)) {
665                 err = start_stream(bebob, &bebob->tx_stream, rate);
666                 if (err < 0) {
667                         dev_err(&bebob->unit->device,
668                                 "fail to run AMDTP slave stream:%d\n", err);
669                         amdtp_stream_stop(&bebob->rx_stream);
670                         break_both_connections(bebob);
671                         goto end;
672                 }
673 
674                 /* wait first callback */
675                 if (!amdtp_stream_wait_callback(&bebob->tx_stream,
676                                                 CALLBACK_TIMEOUT)) {
677                         amdtp_stream_stop(&bebob->tx_stream);
678                         amdtp_stream_stop(&bebob->rx_stream);
679                         break_both_connections(bebob);
680                         err = -ETIMEDOUT;
681                 }
682         }
683 end:
684         return err;
685 }
686 
687 void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob)
688 {
689         if (bebob->substreams_counter == 0) {
690                 amdtp_stream_pcm_abort(&bebob->rx_stream);
691                 amdtp_stream_stop(&bebob->rx_stream);
692 
693                 amdtp_stream_pcm_abort(&bebob->tx_stream);
694                 amdtp_stream_stop(&bebob->tx_stream);
695 
696                 break_both_connections(bebob);
697         }
698 }
699 
700 /*
701  * This function should be called before starting streams or after stopping
702  * streams.
703  */
704 void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob)
705 {
706         amdtp_stream_destroy(&bebob->rx_stream);
707         amdtp_stream_destroy(&bebob->tx_stream);
708 
709         destroy_both_connections(bebob);
710 }
711 
712 /*
713  * See: Table 50: Extended Stream Format Info Format Hierarchy Level 2’
714  * in Additional AVC commands (Nov 2003, BridgeCo)
715  * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
716  */
717 static int
718 parse_stream_formation(u8 *buf, unsigned int len,
719                        struct snd_bebob_stream_formation *formation)
720 {
721         unsigned int i, e, channels, format;
722 
723         /*
724          * this module can support a hierarchy combination that:
725          *  Root:       Audio and Music (0x90)
726          *  Level 1:    AM824 Compound  (0x40)
727          */
728         if ((buf[0] != 0x90) || (buf[1] != 0x40))
729                 return -ENOSYS;
730 
731         /* check sampling rate */
732         for (i = 0; i < ARRAY_SIZE(bridgeco_freq_table); i++) {
733                 if (buf[2] == bridgeco_freq_table[i])
734                         break;
735         }
736         if (i == ARRAY_SIZE(bridgeco_freq_table))
737                 return -ENOSYS;
738 
739         /* Avoid double count by different entries for the same rate. */
740         memset(&formation[i], 0, sizeof(struct snd_bebob_stream_formation));
741 
742         for (e = 0; e < buf[4]; e++) {
743                 channels = buf[5 + e * 2];
744                 format = buf[6 + e * 2];
745 
746                 switch (format) {
747                 /* IEC 60958 Conformant, currently handled as MBLA */
748                 case 0x00:
749                 /* Multi bit linear audio */
750                 case 0x06:      /* Raw */
751                         formation[i].pcm += channels;
752                         break;
753                 /* MIDI Conformant */
754                 case 0x0d:
755                         formation[i].midi += channels;
756                         break;
757                 /* IEC 61937-3 to 7 */
758                 case 0x01:
759                 case 0x02:
760                 case 0x03:
761                 case 0x04:
762                 case 0x05:
763                 /* Multi bit linear audio */
764                 case 0x07:      /* DVD-Audio */
765                 case 0x0c:      /* High Precision */
766                 /* One Bit Audio */
767                 case 0x08:      /* (Plain) Raw */
768                 case 0x09:      /* (Plain) SACD */
769                 case 0x0a:      /* (Encoded) Raw */
770                 case 0x0b:      /* (Encoded) SACD */
771                 /* Synchronization Stream (Stereo Raw audio) */
772                 case 0x40:
773                 /* Don't care */
774                 case 0xff:
775                 default:
776                         return -ENOSYS; /* not supported */
777                 }
778         }
779 
780         if (formation[i].pcm  > AM824_MAX_CHANNELS_FOR_PCM ||
781             formation[i].midi > AM824_MAX_CHANNELS_FOR_MIDI)
782                 return -ENOSYS;
783 
784         return 0;
785 }
786 
787 static int
788 fill_stream_formations(struct snd_bebob *bebob, enum avc_bridgeco_plug_dir dir,
789                        unsigned short pid)
790 {
791         u8 *buf;
792         struct snd_bebob_stream_formation *formations;
793         unsigned int len, eid;
794         u8 addr[AVC_BRIDGECO_ADDR_BYTES];
795         int err;
796 
797         buf = kmalloc(FORMAT_MAXIMUM_LENGTH, GFP_KERNEL);
798         if (buf == NULL)
799                 return -ENOMEM;
800 
801         if (dir == AVC_BRIDGECO_PLUG_DIR_IN)
802                 formations = bebob->rx_stream_formations;
803         else
804                 formations = bebob->tx_stream_formations;
805 
806         for (eid = 0; eid < SND_BEBOB_STRM_FMT_ENTRIES; eid++) {
807                 len = FORMAT_MAXIMUM_LENGTH;
808                 avc_bridgeco_fill_unit_addr(addr, dir,
809                                             AVC_BRIDGECO_PLUG_UNIT_ISOC, pid);
810                 err = avc_bridgeco_get_plug_strm_fmt(bebob->unit, addr, buf,
811                                                      &len, eid);
812                 /* No entries remained. */
813                 if (err == -EINVAL && eid > 0) {
814                         err = 0;
815                         break;
816                 } else if (err < 0) {
817                         dev_err(&bebob->unit->device,
818                         "fail to get stream format %d for isoc %s plug %d:%d\n",
819                                 eid,
820                                 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :
821                                                                     "out",
822                                 pid, err);
823                         break;
824                 }
825 
826                 err = parse_stream_formation(buf, len, formations);
827                 if (err < 0)
828                         break;
829         }
830 
831         kfree(buf);
832         return err;
833 }
834 
835 static int
836 seek_msu_sync_input_plug(struct snd_bebob *bebob)
837 {
838         u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
839         unsigned int i;
840         enum avc_bridgeco_plug_type type;
841         int err;
842 
843         /* Get the number of Music Sub Unit for both direction. */
844         err = avc_general_get_plug_info(bebob->unit, 0x0c, 0x00, 0x00, plugs);
845         if (err < 0) {
846                 dev_err(&bebob->unit->device,
847                         "fail to get info for MSU in/out plugs: %d\n",
848                         err);
849                 goto end;
850         }
851 
852         /* seek destination plugs for 'MSU sync input' */
853         bebob->sync_input_plug = -1;
854         for (i = 0; i < plugs[0]; i++) {
855                 avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN, i);
856                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
857                 if (err < 0) {
858                         dev_err(&bebob->unit->device,
859                                 "fail to get type for MSU in plug %d: %d\n",
860                                 i, err);
861                         goto end;
862                 }
863 
864                 if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
865                         bebob->sync_input_plug = i;
866                         break;
867                 }
868         }
869 end:
870         return err;
871 }
872 
873 int snd_bebob_stream_discover(struct snd_bebob *bebob)
874 {
875         const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
876         u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
877         enum avc_bridgeco_plug_type type;
878         unsigned int i;
879         int err;
880 
881         /* the number of plugs for isoc in/out, ext in/out  */
882         err = avc_general_get_plug_info(bebob->unit, 0x1f, 0x07, 0x00, plugs);
883         if (err < 0) {
884                 dev_err(&bebob->unit->device,
885                 "fail to get info for isoc/external in/out plugs: %d\n",
886                         err);
887                 goto end;
888         }
889 
890         /*
891          * This module supports at least one isoc input plug and one isoc
892          * output plug.
893          */
894         if ((plugs[0] == 0) || (plugs[1] == 0)) {
895                 err = -ENOSYS;
896                 goto end;
897         }
898 
899         avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
900                                     AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
901         err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
902         if (err < 0) {
903                 dev_err(&bebob->unit->device,
904                         "fail to get type for isoc in plug 0: %d\n", err);
905                 goto end;
906         } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
907                 err = -ENOSYS;
908                 goto end;
909         }
910         err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_IN, 0);
911         if (err < 0)
912                 goto end;
913 
914         avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
915                                     AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
916         err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
917         if (err < 0) {
918                 dev_err(&bebob->unit->device,
919                         "fail to get type for isoc out plug 0: %d\n", err);
920                 goto end;
921         } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
922                 err = -ENOSYS;
923                 goto end;
924         }
925         err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_OUT, 0);
926         if (err < 0)
927                 goto end;
928 
929         /* count external input plugs for MIDI */
930         bebob->midi_input_ports = 0;
931         for (i = 0; i < plugs[2]; i++) {
932                 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
933                                             AVC_BRIDGECO_PLUG_UNIT_EXT, i);
934                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
935                 if (err < 0) {
936                         dev_err(&bebob->unit->device,
937                         "fail to get type for external in plug %d: %d\n",
938                                 i, err);
939                         goto end;
940                 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
941                         bebob->midi_input_ports++;
942                 }
943         }
944 
945         /* count external output plugs for MIDI */
946         bebob->midi_output_ports = 0;
947         for (i = 0; i < plugs[3]; i++) {
948                 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
949                                             AVC_BRIDGECO_PLUG_UNIT_EXT, i);
950                 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
951                 if (err < 0) {
952                         dev_err(&bebob->unit->device,
953                         "fail to get type for external out plug %d: %d\n",
954                                 i, err);
955                         goto end;
956                 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
957                         bebob->midi_output_ports++;
958                 }
959         }
960 
961         /* for check source of clock later */
962         if (!clk_spec)
963                 err = seek_msu_sync_input_plug(bebob);
964 end:
965         return err;
966 }
967 
968 void snd_bebob_stream_lock_changed(struct snd_bebob *bebob)
969 {
970         bebob->dev_lock_changed = true;
971         wake_up(&bebob->hwdep_wait);
972 }
973 
974 int snd_bebob_stream_lock_try(struct snd_bebob *bebob)
975 {
976         int err;
977 
978         spin_lock_irq(&bebob->lock);
979 
980         /* user land lock this */
981         if (bebob->dev_lock_count < 0) {
982                 err = -EBUSY;
983                 goto end;
984         }
985 
986         /* this is the first time */
987         if (bebob->dev_lock_count++ == 0)
988                 snd_bebob_stream_lock_changed(bebob);
989         err = 0;
990 end:
991         spin_unlock_irq(&bebob->lock);
992         return err;
993 }
994 
995 void snd_bebob_stream_lock_release(struct snd_bebob *bebob)
996 {
997         spin_lock_irq(&bebob->lock);
998 
999         if (WARN_ON(bebob->dev_lock_count <= 0))
1000                 goto end;
1001         if (--bebob->dev_lock_count == 0)
1002                 snd_bebob_stream_lock_changed(bebob);
1003 end:
1004         spin_unlock_irq(&bebob->lock);
1005 }
1006 

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