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