1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * bebob_stream.c - a part of driver for BeBoB based devices
4 *
5 * Copyright (c) 2013-2014 Takashi Sakamoto
6 */
7
8 #include "./bebob.h"
9
10 #define CALLBACK_TIMEOUT 2500
11 #define FW_ISO_RESOURCE_DELAY 1000
12
13 /*
14 * NOTE;
15 * For BeBoB streams, Both of input and output CMP connection are important.
16 *
17 * For most devices, each CMP connection starts to transmit/receive a
18 * corresponding stream. But for a few devices, both of CMP connection needs
19 * to start transmitting stream. An example is 'M-Audio Firewire 410'.
20 */
21
22 /* 128 is an arbitrary length but it seems to be enough */
23 #define FORMAT_MAXIMUM_LENGTH 128
24
25 const unsigned int snd_bebob_rate_table[SND_BEBOB_STRM_FMT_ENTRIES] = {
26 [0] = 32000,
27 [1] = 44100,
28 [2] = 48000,
29 [3] = 88200,
30 [4] = 96000,
31 [5] = 176400,
32 [6] = 192000,
33 };
34
35 /*
36 * See: Table 51: Extended Stream Format Info ‘Sampling Frequency’
37 * in Additional AVC commands (Nov 2003, BridgeCo)
38 */
39 static const unsigned int bridgeco_freq_table[] = {
40 [0] = 0x02,
41 [1] = 0x03,
42 [2] = 0x04,
43 [3] = 0x0a,
44 [4] = 0x05,
45 [5] = 0x06,
46 [6] = 0x07,
47 };
48
49 static int
get_formation_index(unsigned int rate,unsigned int * index)50 get_formation_index(unsigned int rate, unsigned int *index)
51 {
52 unsigned int i;
53
54 for (i = 0; i < ARRAY_SIZE(snd_bebob_rate_table); i++) {
55 if (snd_bebob_rate_table[i] == rate) {
56 *index = i;
57 return 0;
58 }
59 }
60 return -EINVAL;
61 }
62
63 int
snd_bebob_stream_get_rate(struct snd_bebob * bebob,unsigned int * curr_rate)64 snd_bebob_stream_get_rate(struct snd_bebob *bebob, unsigned int *curr_rate)
65 {
66 unsigned int tx_rate, rx_rate, trials;
67 int err;
68
69 trials = 0;
70 do {
71 err = avc_general_get_sig_fmt(bebob->unit, &tx_rate,
72 AVC_GENERAL_PLUG_DIR_OUT, 0);
73 } while (err == -EAGAIN && ++trials < 3);
74 if (err < 0)
75 goto end;
76
77 trials = 0;
78 do {
79 err = avc_general_get_sig_fmt(bebob->unit, &rx_rate,
80 AVC_GENERAL_PLUG_DIR_IN, 0);
81 } while (err == -EAGAIN && ++trials < 3);
82 if (err < 0)
83 goto end;
84
85 *curr_rate = rx_rate;
86 if (rx_rate == tx_rate)
87 goto end;
88
89 /* synchronize receive stream rate to transmit stream rate */
90 err = avc_general_set_sig_fmt(bebob->unit, rx_rate,
91 AVC_GENERAL_PLUG_DIR_IN, 0);
92 end:
93 return err;
94 }
95
96 int
snd_bebob_stream_set_rate(struct snd_bebob * bebob,unsigned int rate)97 snd_bebob_stream_set_rate(struct snd_bebob *bebob, unsigned int rate)
98 {
99 int err;
100
101 err = avc_general_set_sig_fmt(bebob->unit, rate,
102 AVC_GENERAL_PLUG_DIR_OUT, 0);
103 if (err < 0)
104 goto end;
105
106 err = avc_general_set_sig_fmt(bebob->unit, rate,
107 AVC_GENERAL_PLUG_DIR_IN, 0);
108 if (err < 0)
109 goto end;
110
111 /*
112 * Some devices need a bit time for transition.
113 * 300msec is got by some experiments.
114 */
115 msleep(300);
116 end:
117 return err;
118 }
119
snd_bebob_stream_get_clock_src(struct snd_bebob * bebob,enum snd_bebob_clock_type * src)120 int snd_bebob_stream_get_clock_src(struct snd_bebob *bebob,
121 enum snd_bebob_clock_type *src)
122 {
123 const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
124 u8 addr[AVC_BRIDGECO_ADDR_BYTES], input[7];
125 unsigned int id;
126 enum avc_bridgeco_plug_type type;
127 int err = 0;
128
129 /* 1.The device has its own operation to switch source of clock */
130 if (clk_spec) {
131 err = clk_spec->get(bebob, &id);
132 if (err < 0) {
133 dev_err(&bebob->unit->device,
134 "fail to get clock source: %d\n", err);
135 goto end;
136 }
137
138 if (id >= clk_spec->num) {
139 dev_err(&bebob->unit->device,
140 "clock source %d out of range 0..%d\n",
141 id, clk_spec->num - 1);
142 err = -EIO;
143 goto end;
144 }
145
146 *src = clk_spec->types[id];
147 goto end;
148 }
149
150 /*
151 * 2.The device don't support to switch source of clock then assumed
152 * to use internal clock always
153 */
154 if (bebob->sync_input_plug < 0) {
155 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
156 goto end;
157 }
158
159 /*
160 * 3.The device supports to switch source of clock by an usual way.
161 * Let's check input for 'Music Sub Unit Sync Input' plug.
162 */
163 avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
164 bebob->sync_input_plug);
165 err = avc_bridgeco_get_plug_input(bebob->unit, addr, input);
166 if (err < 0) {
167 dev_err(&bebob->unit->device,
168 "fail to get an input for MSU in plug %d: %d\n",
169 bebob->sync_input_plug, err);
170 goto end;
171 }
172
173 /*
174 * If there are no input plugs, all of fields are 0xff.
175 * Here check the first field. This field is used for direction.
176 */
177 if (input[0] == 0xff) {
178 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
179 goto end;
180 }
181
182 /* The source from any output plugs is for one purpose only. */
183 if (input[0] == AVC_BRIDGECO_PLUG_DIR_OUT) {
184 /*
185 * In BeBoB architecture, the source from music subunit may
186 * bypass from oPCR[0]. This means that this source gives
187 * synchronization to IEEE 1394 cycle start packet.
188 */
189 if (input[1] == AVC_BRIDGECO_PLUG_MODE_SUBUNIT &&
190 input[2] == 0x0c) {
191 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
192 goto end;
193 }
194 /* The source from any input units is for several purposes. */
195 } else if (input[1] == AVC_BRIDGECO_PLUG_MODE_UNIT) {
196 if (input[2] == AVC_BRIDGECO_PLUG_UNIT_ISOC) {
197 if (input[3] == 0x00) {
198 /*
199 * This source comes from iPCR[0]. This means
200 * that presentation timestamp calculated by
201 * SYT series of the received packets. In
202 * short, this driver is the master of
203 * synchronization.
204 */
205 *src = SND_BEBOB_CLOCK_TYPE_SYT;
206 goto end;
207 } else {
208 /*
209 * This source comes from iPCR[1-29]. This
210 * means that the synchronization stream is not
211 * the Audio/MIDI compound stream.
212 */
213 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
214 goto end;
215 }
216 } else if (input[2] == AVC_BRIDGECO_PLUG_UNIT_EXT) {
217 /* Check type of this plug. */
218 avc_bridgeco_fill_unit_addr(addr,
219 AVC_BRIDGECO_PLUG_DIR_IN,
220 AVC_BRIDGECO_PLUG_UNIT_EXT,
221 input[3]);
222 err = avc_bridgeco_get_plug_type(bebob->unit, addr,
223 &type);
224 if (err < 0)
225 goto end;
226
227 if (type == AVC_BRIDGECO_PLUG_TYPE_DIG) {
228 /*
229 * SPDIF/ADAT or sometimes (not always) word
230 * clock.
231 */
232 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
233 goto end;
234 } else if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
235 /* Often word clock. */
236 *src = SND_BEBOB_CLOCK_TYPE_EXTERNAL;
237 goto end;
238 } else if (type == AVC_BRIDGECO_PLUG_TYPE_ADDITION) {
239 /*
240 * Not standard.
241 * Mostly, additional internal clock.
242 */
243 *src = SND_BEBOB_CLOCK_TYPE_INTERNAL;
244 goto end;
245 }
246 }
247 }
248
249 /* Not supported. */
250 err = -EIO;
251 end:
252 return err;
253 }
254
map_data_channels(struct snd_bebob * bebob,struct amdtp_stream * s)255 static int map_data_channels(struct snd_bebob *bebob, struct amdtp_stream *s)
256 {
257 unsigned int sec, sections, ch, channels;
258 unsigned int pcm, midi, location;
259 unsigned int stm_pos, sec_loc, pos;
260 u8 *buf, addr[AVC_BRIDGECO_ADDR_BYTES], type;
261 enum avc_bridgeco_plug_dir dir;
262 int err;
263
264 /*
265 * The length of return value of this command cannot be expected. Here
266 * use the maximum length of FCP.
267 */
268 buf = kzalloc(256, GFP_KERNEL);
269 if (buf == NULL)
270 return -ENOMEM;
271
272 if (s == &bebob->tx_stream)
273 dir = AVC_BRIDGECO_PLUG_DIR_OUT;
274 else
275 dir = AVC_BRIDGECO_PLUG_DIR_IN;
276
277 avc_bridgeco_fill_unit_addr(addr, dir, AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
278 err = avc_bridgeco_get_plug_ch_pos(bebob->unit, addr, buf, 256);
279 if (err < 0) {
280 dev_err(&bebob->unit->device,
281 "fail to get channel position for isoc %s plug 0: %d\n",
282 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" : "out",
283 err);
284 goto end;
285 }
286 pos = 0;
287
288 /* positions in I/O buffer */
289 pcm = 0;
290 midi = 0;
291
292 /* the number of sections in AMDTP packet */
293 sections = buf[pos++];
294
295 for (sec = 0; sec < sections; sec++) {
296 /* type of this section */
297 avc_bridgeco_fill_unit_addr(addr, dir,
298 AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
299 err = avc_bridgeco_get_plug_section_type(bebob->unit, addr,
300 sec, &type);
301 if (err < 0) {
302 dev_err(&bebob->unit->device,
303 "fail to get section type for isoc %s plug 0: %d\n",
304 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :
305 "out",
306 err);
307 goto end;
308 }
309 /* NoType */
310 if (type == 0xff) {
311 err = -ENOSYS;
312 goto end;
313 }
314
315 /* the number of channels in this section */
316 channels = buf[pos++];
317
318 for (ch = 0; ch < channels; ch++) {
319 /* position of this channel in AMDTP packet */
320 stm_pos = buf[pos++] - 1;
321 /* location of this channel in this section */
322 sec_loc = buf[pos++] - 1;
323
324 /*
325 * Basically the number of location is within the
326 * number of channels in this section. But some models
327 * of M-Audio don't follow this. Its location for MIDI
328 * is the position of MIDI channels in AMDTP packet.
329 */
330 if (sec_loc >= channels)
331 sec_loc = ch;
332
333 switch (type) {
334 /* for MIDI conformant data channel */
335 case 0x0a:
336 /* AMDTP_MAX_CHANNELS_FOR_MIDI is 1. */
337 if ((midi > 0) && (stm_pos != midi)) {
338 err = -ENOSYS;
339 goto end;
340 }
341 amdtp_am824_set_midi_position(s, stm_pos);
342 midi = stm_pos;
343 break;
344 /* for PCM data channel */
345 case 0x01: /* Headphone */
346 case 0x02: /* Microphone */
347 case 0x03: /* Line */
348 case 0x04: /* SPDIF */
349 case 0x05: /* ADAT */
350 case 0x06: /* TDIF */
351 case 0x07: /* MADI */
352 /* for undefined/changeable signal */
353 case 0x08: /* Analog */
354 case 0x09: /* Digital */
355 default:
356 location = pcm + sec_loc;
357 if (location >= AM824_MAX_CHANNELS_FOR_PCM) {
358 err = -ENOSYS;
359 goto end;
360 }
361 amdtp_am824_set_pcm_position(s, location,
362 stm_pos);
363 break;
364 }
365 }
366
367 if (type != 0x0a)
368 pcm += channels;
369 else
370 midi += channels;
371 }
372 end:
373 kfree(buf);
374 return err;
375 }
376
377 static int
check_connection_used_by_others(struct snd_bebob * bebob,struct amdtp_stream * s)378 check_connection_used_by_others(struct snd_bebob *bebob, struct amdtp_stream *s)
379 {
380 struct cmp_connection *conn;
381 bool used;
382 int err;
383
384 if (s == &bebob->tx_stream)
385 conn = &bebob->out_conn;
386 else
387 conn = &bebob->in_conn;
388
389 err = cmp_connection_check_used(conn, &used);
390 if ((err >= 0) && used && !amdtp_stream_running(s)) {
391 dev_err(&bebob->unit->device,
392 "Connection established by others: %cPCR[%d]\n",
393 (conn->direction == CMP_OUTPUT) ? 'o' : 'i',
394 conn->pcr_index);
395 err = -EBUSY;
396 }
397
398 return err;
399 }
400
break_both_connections(struct snd_bebob * bebob)401 static void break_both_connections(struct snd_bebob *bebob)
402 {
403 cmp_connection_break(&bebob->in_conn);
404 cmp_connection_break(&bebob->out_conn);
405
406 // These models seem to be in transition state for a longer time. When
407 // accessing in the state, any transactions is corrupted. In the worst
408 // case, the device is going to reboot.
409 if (bebob->version < 2)
410 msleep(600);
411 }
412
start_stream(struct snd_bebob * bebob,struct amdtp_stream * stream)413 static int start_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
414 {
415 struct cmp_connection *conn;
416 int err = 0;
417
418 if (stream == &bebob->rx_stream)
419 conn = &bebob->in_conn;
420 else
421 conn = &bebob->out_conn;
422
423 // channel mapping.
424 if (bebob->maudio_special_quirk == NULL) {
425 err = map_data_channels(bebob, stream);
426 if (err < 0)
427 return err;
428 }
429
430 err = cmp_connection_establish(conn);
431 if (err < 0)
432 return err;
433
434 return amdtp_domain_add_stream(&bebob->domain, stream,
435 conn->resources.channel, conn->speed);
436 }
437
init_stream(struct snd_bebob * bebob,struct amdtp_stream * stream)438 static int init_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
439 {
440 enum amdtp_stream_direction dir_stream;
441 struct cmp_connection *conn;
442 enum cmp_direction dir_conn;
443 int err;
444
445 if (stream == &bebob->tx_stream) {
446 dir_stream = AMDTP_IN_STREAM;
447 conn = &bebob->out_conn;
448 dir_conn = CMP_OUTPUT;
449 } else {
450 dir_stream = AMDTP_OUT_STREAM;
451 conn = &bebob->in_conn;
452 dir_conn = CMP_INPUT;
453 }
454
455 err = cmp_connection_init(conn, bebob->unit, dir_conn, 0);
456 if (err < 0)
457 return err;
458
459 err = amdtp_am824_init(stream, bebob->unit, dir_stream, CIP_BLOCKING);
460 if (err < 0) {
461 cmp_connection_destroy(conn);
462 return err;
463 }
464
465 if (stream == &bebob->tx_stream) {
466 // BeBoB v3 transfers packets with these qurks:
467 // - In the beginning of streaming, the value of dbc is
468 // incremented even if no data blocks are transferred.
469 // - The value of dbc is reset suddenly.
470 if (bebob->version > 2)
471 bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC |
472 CIP_SKIP_DBC_ZERO_CHECK;
473
474 // At high sampling rate, M-Audio special firmware transmits
475 // empty packet with the value of dbc incremented by 8 but the
476 // others are valid to IEC 61883-1.
477 if (bebob->maudio_special_quirk)
478 bebob->tx_stream.flags |= CIP_EMPTY_HAS_WRONG_DBC;
479 }
480
481 return 0;
482 }
483
destroy_stream(struct snd_bebob * bebob,struct amdtp_stream * stream)484 static void destroy_stream(struct snd_bebob *bebob, struct amdtp_stream *stream)
485 {
486 amdtp_stream_destroy(stream);
487
488 if (stream == &bebob->tx_stream)
489 cmp_connection_destroy(&bebob->out_conn);
490 else
491 cmp_connection_destroy(&bebob->in_conn);
492 }
493
snd_bebob_stream_init_duplex(struct snd_bebob * bebob)494 int snd_bebob_stream_init_duplex(struct snd_bebob *bebob)
495 {
496 int err;
497
498 err = init_stream(bebob, &bebob->tx_stream);
499 if (err < 0)
500 return err;
501
502 err = init_stream(bebob, &bebob->rx_stream);
503 if (err < 0) {
504 destroy_stream(bebob, &bebob->tx_stream);
505 return err;
506 }
507
508 err = amdtp_domain_init(&bebob->domain);
509 if (err < 0) {
510 destroy_stream(bebob, &bebob->tx_stream);
511 destroy_stream(bebob, &bebob->rx_stream);
512 }
513
514 return err;
515 }
516
keep_resources(struct snd_bebob * bebob,struct amdtp_stream * stream,unsigned int rate,unsigned int index)517 static int keep_resources(struct snd_bebob *bebob, struct amdtp_stream *stream,
518 unsigned int rate, unsigned int index)
519 {
520 unsigned int pcm_channels;
521 unsigned int midi_ports;
522 struct cmp_connection *conn;
523 int err;
524
525 if (stream == &bebob->tx_stream) {
526 pcm_channels = bebob->tx_stream_formations[index].pcm;
527 midi_ports = bebob->midi_input_ports;
528 conn = &bebob->out_conn;
529 } else {
530 pcm_channels = bebob->rx_stream_formations[index].pcm;
531 midi_ports = bebob->midi_output_ports;
532 conn = &bebob->in_conn;
533 }
534
535 err = amdtp_am824_set_parameters(stream, rate, pcm_channels, midi_ports, false);
536 if (err < 0)
537 return err;
538
539 return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream));
540 }
541
snd_bebob_stream_reserve_duplex(struct snd_bebob * bebob,unsigned int rate,unsigned int frames_per_period,unsigned int frames_per_buffer)542 int snd_bebob_stream_reserve_duplex(struct snd_bebob *bebob, unsigned int rate,
543 unsigned int frames_per_period,
544 unsigned int frames_per_buffer)
545 {
546 unsigned int curr_rate;
547 int err;
548
549 // Considering JACK/FFADO streaming:
550 // TODO: This can be removed hwdep functionality becomes popular.
551 err = check_connection_used_by_others(bebob, &bebob->rx_stream);
552 if (err < 0)
553 return err;
554
555 err = bebob->spec->rate->get(bebob, &curr_rate);
556 if (err < 0)
557 return err;
558 if (rate == 0)
559 rate = curr_rate;
560 if (curr_rate != rate) {
561 amdtp_domain_stop(&bebob->domain);
562 break_both_connections(bebob);
563
564 cmp_connection_release(&bebob->out_conn);
565 cmp_connection_release(&bebob->in_conn);
566 }
567
568 if (bebob->substreams_counter == 0 || curr_rate != rate) {
569 unsigned int index;
570
571 // NOTE:
572 // If establishing connections at first, Yamaha GO46
573 // (and maybe Terratec X24) don't generate sound.
574 //
575 // For firmware customized by M-Audio, refer to next NOTE.
576 err = bebob->spec->rate->set(bebob, rate);
577 if (err < 0) {
578 dev_err(&bebob->unit->device,
579 "fail to set sampling rate: %d\n",
580 err);
581 return err;
582 }
583
584 err = get_formation_index(rate, &index);
585 if (err < 0)
586 return err;
587
588 err = keep_resources(bebob, &bebob->tx_stream, rate, index);
589 if (err < 0)
590 return err;
591
592 err = keep_resources(bebob, &bebob->rx_stream, rate, index);
593 if (err < 0) {
594 cmp_connection_release(&bebob->out_conn);
595 return err;
596 }
597
598 err = amdtp_domain_set_events_per_period(&bebob->domain,
599 frames_per_period, frames_per_buffer);
600 if (err < 0) {
601 cmp_connection_release(&bebob->out_conn);
602 cmp_connection_release(&bebob->in_conn);
603 return err;
604 }
605 }
606
607 return 0;
608 }
609
snd_bebob_stream_start_duplex(struct snd_bebob * bebob)610 int snd_bebob_stream_start_duplex(struct snd_bebob *bebob)
611 {
612 int err;
613
614 // Need no substreams.
615 if (bebob->substreams_counter == 0)
616 return -EIO;
617
618 // packet queueing error or detecting discontinuity
619 if (amdtp_streaming_error(&bebob->rx_stream) ||
620 amdtp_streaming_error(&bebob->tx_stream)) {
621 amdtp_domain_stop(&bebob->domain);
622 break_both_connections(bebob);
623 }
624
625 if (!amdtp_stream_running(&bebob->rx_stream)) {
626 enum snd_bebob_clock_type src;
627 struct amdtp_stream *master, *slave;
628 unsigned int curr_rate;
629 unsigned int ir_delay_cycle;
630
631 if (bebob->maudio_special_quirk) {
632 err = bebob->spec->rate->get(bebob, &curr_rate);
633 if (err < 0)
634 return err;
635 }
636
637 err = snd_bebob_stream_get_clock_src(bebob, &src);
638 if (err < 0)
639 return err;
640
641 if (src != SND_BEBOB_CLOCK_TYPE_SYT) {
642 master = &bebob->tx_stream;
643 slave = &bebob->rx_stream;
644 } else {
645 master = &bebob->rx_stream;
646 slave = &bebob->tx_stream;
647 }
648
649 err = start_stream(bebob, master);
650 if (err < 0)
651 goto error;
652
653 err = start_stream(bebob, slave);
654 if (err < 0)
655 goto error;
656
657 // The device postpones start of transmission mostly for 1 sec
658 // after receives packets firstly. For safe, IR context starts
659 // 0.4 sec (=3200 cycles) later to version 1 or 2 firmware,
660 // 2.0 sec (=16000 cycles) for version 3 firmware. This is
661 // within 2.5 sec (=CALLBACK_TIMEOUT).
662 // Furthermore, some devices transfer isoc packets with
663 // discontinuous counter in the beginning of packet streaming.
664 // The delay has an effect to avoid detection of this
665 // discontinuity.
666 if (bebob->version < 2)
667 ir_delay_cycle = 3200;
668 else
669 ir_delay_cycle = 16000;
670 err = amdtp_domain_start(&bebob->domain, ir_delay_cycle);
671 if (err < 0)
672 goto error;
673
674 // NOTE:
675 // The firmware customized by M-Audio uses these commands to
676 // start transmitting stream. This is not usual way.
677 if (bebob->maudio_special_quirk) {
678 err = bebob->spec->rate->set(bebob, curr_rate);
679 if (err < 0) {
680 dev_err(&bebob->unit->device,
681 "fail to ensure sampling rate: %d\n",
682 err);
683 goto error;
684 }
685 }
686
687 if (!amdtp_stream_wait_callback(&bebob->rx_stream,
688 CALLBACK_TIMEOUT) ||
689 !amdtp_stream_wait_callback(&bebob->tx_stream,
690 CALLBACK_TIMEOUT)) {
691 err = -ETIMEDOUT;
692 goto error;
693 }
694 }
695
696 return 0;
697 error:
698 amdtp_domain_stop(&bebob->domain);
699 break_both_connections(bebob);
700 return err;
701 }
702
snd_bebob_stream_stop_duplex(struct snd_bebob * bebob)703 void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob)
704 {
705 if (bebob->substreams_counter == 0) {
706 amdtp_domain_stop(&bebob->domain);
707 break_both_connections(bebob);
708
709 cmp_connection_release(&bebob->out_conn);
710 cmp_connection_release(&bebob->in_conn);
711 }
712 }
713
714 /*
715 * This function should be called before starting streams or after stopping
716 * streams.
717 */
snd_bebob_stream_destroy_duplex(struct snd_bebob * bebob)718 void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob)
719 {
720 amdtp_domain_destroy(&bebob->domain);
721
722 destroy_stream(bebob, &bebob->tx_stream);
723 destroy_stream(bebob, &bebob->rx_stream);
724 }
725
726 /*
727 * See: Table 50: Extended Stream Format Info Format Hierarchy Level 2’
728 * in Additional AVC commands (Nov 2003, BridgeCo)
729 * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
730 */
731 static int
parse_stream_formation(u8 * buf,unsigned int len,struct snd_bebob_stream_formation * formation)732 parse_stream_formation(u8 *buf, unsigned int len,
733 struct snd_bebob_stream_formation *formation)
734 {
735 unsigned int i, e, channels, format;
736
737 /*
738 * this module can support a hierarchy combination that:
739 * Root: Audio and Music (0x90)
740 * Level 1: AM824 Compound (0x40)
741 */
742 if ((buf[0] != 0x90) || (buf[1] != 0x40))
743 return -ENOSYS;
744
745 /* check sampling rate */
746 for (i = 0; i < ARRAY_SIZE(bridgeco_freq_table); i++) {
747 if (buf[2] == bridgeco_freq_table[i])
748 break;
749 }
750 if (i == ARRAY_SIZE(bridgeco_freq_table))
751 return -ENOSYS;
752
753 /* Avoid double count by different entries for the same rate. */
754 memset(&formation[i], 0, sizeof(struct snd_bebob_stream_formation));
755
756 for (e = 0; e < buf[4]; e++) {
757 channels = buf[5 + e * 2];
758 format = buf[6 + e * 2];
759
760 switch (format) {
761 /* IEC 60958 Conformant, currently handled as MBLA */
762 case 0x00:
763 /* Multi bit linear audio */
764 case 0x06: /* Raw */
765 formation[i].pcm += channels;
766 break;
767 /* MIDI Conformant */
768 case 0x0d:
769 formation[i].midi += channels;
770 break;
771 /* IEC 61937-3 to 7 */
772 case 0x01:
773 case 0x02:
774 case 0x03:
775 case 0x04:
776 case 0x05:
777 /* Multi bit linear audio */
778 case 0x07: /* DVD-Audio */
779 case 0x0c: /* High Precision */
780 /* One Bit Audio */
781 case 0x08: /* (Plain) Raw */
782 case 0x09: /* (Plain) SACD */
783 case 0x0a: /* (Encoded) Raw */
784 case 0x0b: /* (Encoded) SACD */
785 /* Synchronization Stream (Stereo Raw audio) */
786 case 0x40:
787 /* Don't care */
788 case 0xff:
789 default:
790 return -ENOSYS; /* not supported */
791 }
792 }
793
794 if (formation[i].pcm > AM824_MAX_CHANNELS_FOR_PCM ||
795 formation[i].midi > AM824_MAX_CHANNELS_FOR_MIDI)
796 return -ENOSYS;
797
798 return 0;
799 }
800
801 static int
fill_stream_formations(struct snd_bebob * bebob,enum avc_bridgeco_plug_dir dir,unsigned short pid)802 fill_stream_formations(struct snd_bebob *bebob, enum avc_bridgeco_plug_dir dir,
803 unsigned short pid)
804 {
805 u8 *buf;
806 struct snd_bebob_stream_formation *formations;
807 unsigned int len, eid;
808 u8 addr[AVC_BRIDGECO_ADDR_BYTES];
809 int err;
810
811 buf = kmalloc(FORMAT_MAXIMUM_LENGTH, GFP_KERNEL);
812 if (buf == NULL)
813 return -ENOMEM;
814
815 if (dir == AVC_BRIDGECO_PLUG_DIR_IN)
816 formations = bebob->rx_stream_formations;
817 else
818 formations = bebob->tx_stream_formations;
819
820 for (eid = 0; eid < SND_BEBOB_STRM_FMT_ENTRIES; eid++) {
821 len = FORMAT_MAXIMUM_LENGTH;
822 avc_bridgeco_fill_unit_addr(addr, dir,
823 AVC_BRIDGECO_PLUG_UNIT_ISOC, pid);
824 err = avc_bridgeco_get_plug_strm_fmt(bebob->unit, addr, buf,
825 &len, eid);
826 /* No entries remained. */
827 if (err == -EINVAL && eid > 0) {
828 err = 0;
829 break;
830 } else if (err < 0) {
831 dev_err(&bebob->unit->device,
832 "fail to get stream format %d for isoc %s plug %d:%d\n",
833 eid,
834 (dir == AVC_BRIDGECO_PLUG_DIR_IN) ? "in" :
835 "out",
836 pid, err);
837 break;
838 }
839
840 err = parse_stream_formation(buf, len, formations);
841 if (err < 0)
842 break;
843 }
844
845 kfree(buf);
846 return err;
847 }
848
849 static int
seek_msu_sync_input_plug(struct snd_bebob * bebob)850 seek_msu_sync_input_plug(struct snd_bebob *bebob)
851 {
852 u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
853 unsigned int i;
854 enum avc_bridgeco_plug_type type;
855 int err;
856
857 /* Get the number of Music Sub Unit for both direction. */
858 err = avc_general_get_plug_info(bebob->unit, 0x0c, 0x00, 0x00, plugs);
859 if (err < 0) {
860 dev_err(&bebob->unit->device,
861 "fail to get info for MSU in/out plugs: %d\n",
862 err);
863 goto end;
864 }
865
866 /* seek destination plugs for 'MSU sync input' */
867 bebob->sync_input_plug = -1;
868 for (i = 0; i < plugs[0]; i++) {
869 avc_bridgeco_fill_msu_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN, i);
870 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
871 if (err < 0) {
872 dev_err(&bebob->unit->device,
873 "fail to get type for MSU in plug %d: %d\n",
874 i, err);
875 goto end;
876 }
877
878 if (type == AVC_BRIDGECO_PLUG_TYPE_SYNC) {
879 bebob->sync_input_plug = i;
880 break;
881 }
882 }
883 end:
884 return err;
885 }
886
snd_bebob_stream_discover(struct snd_bebob * bebob)887 int snd_bebob_stream_discover(struct snd_bebob *bebob)
888 {
889 const struct snd_bebob_clock_spec *clk_spec = bebob->spec->clock;
890 u8 plugs[AVC_PLUG_INFO_BUF_BYTES], addr[AVC_BRIDGECO_ADDR_BYTES];
891 enum avc_bridgeco_plug_type type;
892 unsigned int i;
893 int err;
894
895 /* the number of plugs for isoc in/out, ext in/out */
896 err = avc_general_get_plug_info(bebob->unit, 0x1f, 0x07, 0x00, plugs);
897 if (err < 0) {
898 dev_err(&bebob->unit->device,
899 "fail to get info for isoc/external in/out plugs: %d\n",
900 err);
901 goto end;
902 }
903
904 /*
905 * This module supports at least one isoc input plug and one isoc
906 * output plug.
907 */
908 if ((plugs[0] == 0) || (plugs[1] == 0)) {
909 err = -ENOSYS;
910 goto end;
911 }
912
913 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
914 AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
915 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
916 if (err < 0) {
917 dev_err(&bebob->unit->device,
918 "fail to get type for isoc in plug 0: %d\n", err);
919 goto end;
920 } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
921 err = -ENOSYS;
922 goto end;
923 }
924 err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_IN, 0);
925 if (err < 0)
926 goto end;
927
928 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
929 AVC_BRIDGECO_PLUG_UNIT_ISOC, 0);
930 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
931 if (err < 0) {
932 dev_err(&bebob->unit->device,
933 "fail to get type for isoc out plug 0: %d\n", err);
934 goto end;
935 } else if (type != AVC_BRIDGECO_PLUG_TYPE_ISOC) {
936 err = -ENOSYS;
937 goto end;
938 }
939 err = fill_stream_formations(bebob, AVC_BRIDGECO_PLUG_DIR_OUT, 0);
940 if (err < 0)
941 goto end;
942
943 /* count external input plugs for MIDI */
944 bebob->midi_input_ports = 0;
945 for (i = 0; i < plugs[2]; i++) {
946 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_IN,
947 AVC_BRIDGECO_PLUG_UNIT_EXT, i);
948 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
949 if (err < 0) {
950 dev_err(&bebob->unit->device,
951 "fail to get type for external in plug %d: %d\n",
952 i, err);
953 goto end;
954 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
955 bebob->midi_input_ports++;
956 }
957 }
958
959 /* count external output plugs for MIDI */
960 bebob->midi_output_ports = 0;
961 for (i = 0; i < plugs[3]; i++) {
962 avc_bridgeco_fill_unit_addr(addr, AVC_BRIDGECO_PLUG_DIR_OUT,
963 AVC_BRIDGECO_PLUG_UNIT_EXT, i);
964 err = avc_bridgeco_get_plug_type(bebob->unit, addr, &type);
965 if (err < 0) {
966 dev_err(&bebob->unit->device,
967 "fail to get type for external out plug %d: %d\n",
968 i, err);
969 goto end;
970 } else if (type == AVC_BRIDGECO_PLUG_TYPE_MIDI) {
971 bebob->midi_output_ports++;
972 }
973 }
974
975 /* for check source of clock later */
976 if (!clk_spec)
977 err = seek_msu_sync_input_plug(bebob);
978 end:
979 return err;
980 }
981
snd_bebob_stream_lock_changed(struct snd_bebob * bebob)982 void snd_bebob_stream_lock_changed(struct snd_bebob *bebob)
983 {
984 bebob->dev_lock_changed = true;
985 wake_up(&bebob->hwdep_wait);
986 }
987
snd_bebob_stream_lock_try(struct snd_bebob * bebob)988 int snd_bebob_stream_lock_try(struct snd_bebob *bebob)
989 {
990 int err;
991
992 spin_lock_irq(&bebob->lock);
993
994 /* user land lock this */
995 if (bebob->dev_lock_count < 0) {
996 err = -EBUSY;
997 goto end;
998 }
999
1000 /* this is the first time */
1001 if (bebob->dev_lock_count++ == 0)
1002 snd_bebob_stream_lock_changed(bebob);
1003 err = 0;
1004 end:
1005 spin_unlock_irq(&bebob->lock);
1006 return err;
1007 }
1008
snd_bebob_stream_lock_release(struct snd_bebob * bebob)1009 void snd_bebob_stream_lock_release(struct snd_bebob *bebob)
1010 {
1011 spin_lock_irq(&bebob->lock);
1012
1013 if (WARN_ON(bebob->dev_lock_count <= 0))
1014 goto end;
1015 if (--bebob->dev_lock_count == 0)
1016 snd_bebob_stream_lock_changed(bebob);
1017 end:
1018 spin_unlock_irq(&bebob->lock);
1019 }
1020