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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 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 }