1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * oxfw_stream.c - a part of driver for OXFW970/971 based devices
4 *
5 * Copyright (c) 2014 Takashi Sakamoto
6 */
7
8 #include "oxfw.h"
9 #include <linux/delay.h>
10
11 #define AVC_GENERIC_FRAME_MAXIMUM_BYTES 512
12 #define READY_TIMEOUT_MS 600
13
14 /*
15 * According to datasheet of Oxford Semiconductor:
16 * OXFW970: 32.0/44.1/48.0/96.0 Khz, 8 audio channels I/O
17 * OXFW971: 32.0/44.1/48.0/88.2/96.0/192.0 kHz, 16 audio channels I/O, MIDI I/O
18 */
19 static const unsigned int oxfw_rate_table[] = {
20 [0] = 32000,
21 [1] = 44100,
22 [2] = 48000,
23 [3] = 88200,
24 [4] = 96000,
25 [5] = 192000,
26 };
27
28 /*
29 * See Table 5.7 – Sampling frequency for Multi-bit Audio
30 * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA)
31 */
32 static const unsigned int avc_stream_rate_table[] = {
33 [0] = 0x02,
34 [1] = 0x03,
35 [2] = 0x04,
36 [3] = 0x0a,
37 [4] = 0x05,
38 [5] = 0x07,
39 };
40
41 static int set_rate(struct snd_oxfw *oxfw, unsigned int rate)
42 {
43 int err;
44
45 err = avc_general_set_sig_fmt(oxfw->unit, rate,
46 AVC_GENERAL_PLUG_DIR_IN, 0);
47 if (err < 0)
48 goto end;
49
50 if (oxfw->has_output)
51 err = avc_general_set_sig_fmt(oxfw->unit, rate,
52 AVC_GENERAL_PLUG_DIR_OUT, 0);
53 end:
54 return err;
55 }
56
57 static int set_stream_format(struct snd_oxfw *oxfw, struct amdtp_stream *s,
58 unsigned int rate, unsigned int pcm_channels)
59 {
60 u8 **formats;
61 struct snd_oxfw_stream_formation formation;
62 enum avc_general_plug_dir dir;
63 unsigned int len;
64 int i, err;
65
66 if (s == &oxfw->tx_stream) {
67 formats = oxfw->tx_stream_formats;
68 dir = AVC_GENERAL_PLUG_DIR_OUT;
69 } else {
70 formats = oxfw->rx_stream_formats;
71 dir = AVC_GENERAL_PLUG_DIR_IN;
72 }
73
74 /* Seek stream format for requirements. */
75 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
76 err = snd_oxfw_stream_parse_format(formats[i], &formation);
77 if (err < 0)
78 return err;
79
80 if ((formation.rate == rate) && (formation.pcm == pcm_channels))
81 break;
82 }
83 if (i == SND_OXFW_STREAM_FORMAT_ENTRIES)
84 return -EINVAL;
85
86 /* If assumed, just change rate. */
87 if (oxfw->assumed)
88 return set_rate(oxfw, rate);
89
90 /* Calculate format length. */
91 len = 5 + formats[i][4] * 2;
92
93 err = avc_stream_set_format(oxfw->unit, dir, 0, formats[i], len);
94 if (err < 0)
95 return err;
96
97 /* Some requests just after changing format causes freezing. */
98 msleep(100);
99
100 return 0;
101 }
102
103 static int start_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
104 {
105 struct cmp_connection *conn;
106 int err;
107
108 if (stream == &oxfw->rx_stream)
109 conn = &oxfw->in_conn;
110 else
111 conn = &oxfw->out_conn;
112
113 err = cmp_connection_establish(conn);
114 if (err < 0)
115 return err;
116
117 err = amdtp_domain_add_stream(&oxfw->domain, stream,
118 conn->resources.channel, conn->speed);
119 if (err < 0) {
120 cmp_connection_break(conn);
121 return err;
122 }
123
124 return 0;
125 }
126
127 static int check_connection_used_by_others(struct snd_oxfw *oxfw,
128 struct amdtp_stream *stream)
129 {
130 struct cmp_connection *conn;
131 bool used;
132 int err;
133
134 if (stream == &oxfw->tx_stream)
135 conn = &oxfw->out_conn;
136 else
137 conn = &oxfw->in_conn;
138
139 err = cmp_connection_check_used(conn, &used);
140 if ((err >= 0) && used && !amdtp_stream_running(stream)) {
141 dev_err(&oxfw->unit->device,
142 "Connection established by others: %cPCR[%d]\n",
143 (conn->direction == CMP_OUTPUT) ? 'o' : 'i',
144 conn->pcr_index);
145 err = -EBUSY;
146 }
147
148 return err;
149 }
150
151 static int init_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
152 {
153 struct cmp_connection *conn;
154 enum cmp_direction c_dir;
155 enum amdtp_stream_direction s_dir;
156 unsigned int flags = 0;
157 int err;
158
159 if (!(oxfw->quirks & SND_OXFW_QUIRK_BLOCKING_TRANSMISSION))
160 flags |= CIP_NONBLOCKING;
161 else
162 flags |= CIP_BLOCKING;
163
164 // OXFW 970/971 has no function to generate playback timing according to the sequence
165 // of value in syt field, thus the packet should include NO_INFO value in the field.
166 // However, some models just ignore data blocks in packet with NO_INFO for audio data
167 // processing.
168 if (!(oxfw->quirks & SND_OXFW_QUIRK_IGNORE_NO_INFO_PACKET))
169 flags |= CIP_UNAWARE_SYT;
170
171 if (stream == &oxfw->tx_stream) {
172 conn = &oxfw->out_conn;
173 c_dir = CMP_OUTPUT;
174 s_dir = AMDTP_IN_STREAM;
175
176 if (oxfw->quirks & SND_OXFW_QUIRK_JUMBO_PAYLOAD)
177 flags |= CIP_JUMBO_PAYLOAD;
178 if (oxfw->quirks & SND_OXFW_QUIRK_WRONG_DBS)
179 flags |= CIP_WRONG_DBS;
180 if (oxfw->quirks & SND_OXFW_QUIRK_DBC_IS_TOTAL_PAYLOAD_QUADLETS)
181 flags |= CIP_DBC_IS_END_EVENT | CIP_DBC_IS_PAYLOAD_QUADLETS;
182 } else {
183 conn = &oxfw->in_conn;
184 c_dir = CMP_INPUT;
185 s_dir = AMDTP_OUT_STREAM;
186 }
187
188 err = cmp_connection_init(conn, oxfw->unit, c_dir, 0);
189 if (err < 0)
190 return err;
191
192 err = amdtp_am824_init(stream, oxfw->unit, s_dir, flags);
193 if (err < 0) {
194 cmp_connection_destroy(conn);
195 return err;
196 }
197
198 return 0;
199 }
200
201 static int keep_resources(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
202 {
203 enum avc_general_plug_dir dir;
204 u8 **formats;
205 struct snd_oxfw_stream_formation formation;
206 struct cmp_connection *conn;
207 int i;
208 int err;
209
210 if (stream == &oxfw->rx_stream) {
211 dir = AVC_GENERAL_PLUG_DIR_IN;
212 formats = oxfw->rx_stream_formats;
213 conn = &oxfw->in_conn;
214 } else {
215 dir = AVC_GENERAL_PLUG_DIR_OUT;
216 formats = oxfw->tx_stream_formats;
217 conn = &oxfw->out_conn;
218 }
219
220 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
221 if (err < 0)
222 return err;
223
224 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
225 struct snd_oxfw_stream_formation fmt;
226
227 if (formats[i] == NULL)
228 break;
229
230 err = snd_oxfw_stream_parse_format(formats[i], &fmt);
231 if (err < 0)
232 return err;
233
234 if (fmt.rate == formation.rate && fmt.pcm == formation.pcm &&
235 fmt.midi == formation.midi)
236 break;
237 }
238 if (i == SND_OXFW_STREAM_FORMAT_ENTRIES)
239 return -EINVAL;
240
241 // The stream should have one pcm channels at least.
242 if (formation.pcm == 0)
243 return -EINVAL;
244
245 err = amdtp_am824_set_parameters(stream, formation.rate, formation.pcm,
246 formation.midi * 8, false);
247 if (err < 0)
248 return err;
249
250 return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream));
251 }
252
253 int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw,
254 struct amdtp_stream *stream,
255 unsigned int rate, unsigned int pcm_channels,
256 unsigned int frames_per_period,
257 unsigned int frames_per_buffer)
258 {
259 struct snd_oxfw_stream_formation formation;
260 enum avc_general_plug_dir dir;
261 int err;
262
263 // Considering JACK/FFADO streaming:
264 // TODO: This can be removed hwdep functionality becomes popular.
265 err = check_connection_used_by_others(oxfw, &oxfw->rx_stream);
266 if (err < 0)
267 return err;
268 if (oxfw->has_output) {
269 err = check_connection_used_by_others(oxfw, &oxfw->tx_stream);
270 if (err < 0)
271 return err;
272 }
273
274 if (stream == &oxfw->tx_stream)
275 dir = AVC_GENERAL_PLUG_DIR_OUT;
276 else
277 dir = AVC_GENERAL_PLUG_DIR_IN;
278
279 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
280 if (err < 0)
281 return err;
282 if (rate == 0) {
283 rate = formation.rate;
284 pcm_channels = formation.pcm;
285 }
286 if (formation.rate != rate || formation.pcm != pcm_channels) {
287 amdtp_domain_stop(&oxfw->domain);
288
289 cmp_connection_break(&oxfw->in_conn);
290 cmp_connection_release(&oxfw->in_conn);
291
292 if (oxfw->has_output) {
293 cmp_connection_break(&oxfw->out_conn);
294 cmp_connection_release(&oxfw->out_conn);
295 }
296 }
297
298 if (oxfw->substreams_count == 0 ||
299 formation.rate != rate || formation.pcm != pcm_channels) {
300 err = set_stream_format(oxfw, stream, rate, pcm_channels);
301 if (err < 0) {
302 dev_err(&oxfw->unit->device,
303 "fail to set stream format: %d\n", err);
304 return err;
305 }
306
307 err = keep_resources(oxfw, &oxfw->rx_stream);
308 if (err < 0)
309 return err;
310
311 if (oxfw->has_output) {
312 err = keep_resources(oxfw, &oxfw->tx_stream);
313 if (err < 0) {
314 cmp_connection_release(&oxfw->in_conn);
315 return err;
316 }
317 }
318
319 err = amdtp_domain_set_events_per_period(&oxfw->domain,
320 frames_per_period, frames_per_buffer);
321 if (err < 0) {
322 cmp_connection_release(&oxfw->in_conn);
323 if (oxfw->has_output)
324 cmp_connection_release(&oxfw->out_conn);
325 return err;
326 }
327 }
328
329 return 0;
330 }
331
332 int snd_oxfw_stream_start_duplex(struct snd_oxfw *oxfw)
333 {
334 int err;
335
336 if (oxfw->substreams_count == 0)
337 return -EIO;
338
339 if (amdtp_streaming_error(&oxfw->rx_stream) ||
340 amdtp_streaming_error(&oxfw->tx_stream)) {
341 amdtp_domain_stop(&oxfw->domain);
342
343 cmp_connection_break(&oxfw->in_conn);
344 if (oxfw->has_output)
345 cmp_connection_break(&oxfw->out_conn);
346 }
347
348 if (!amdtp_stream_running(&oxfw->rx_stream)) {
349 unsigned int tx_init_skip_cycles = 0;
350 bool replay_seq = false;
351
352 err = start_stream(oxfw, &oxfw->rx_stream);
353 if (err < 0) {
354 dev_err(&oxfw->unit->device,
355 "fail to prepare rx stream: %d\n", err);
356 goto error;
357 }
358
359 if (oxfw->has_output &&
360 !amdtp_stream_running(&oxfw->tx_stream)) {
361 err = start_stream(oxfw, &oxfw->tx_stream);
362 if (err < 0) {
363 dev_err(&oxfw->unit->device,
364 "fail to prepare tx stream: %d\n", err);
365 goto error;
366 }
367
368 if (oxfw->quirks & SND_OXFW_QUIRK_JUMBO_PAYLOAD) {
369 // Just after changing sampling transfer frequency, many cycles are
370 // skipped for packet transmission.
371 tx_init_skip_cycles = 400;
372 } else if (oxfw->quirks & SND_OXFW_QUIRK_VOLUNTARY_RECOVERY) {
373 // It takes a bit time for target device to adjust event frequency
374 // according to nominal event frequency in isochronous packets from
375 // ALSA oxfw driver.
376 tx_init_skip_cycles = 4000;
377 } else {
378 replay_seq = true;
379 }
380 }
381
382 // NOTE: The device ignores presentation time expressed by the value of syt field
383 // of CIP header in received packets. The sequence of the number of data blocks per
384 // packet is important for media clock recovery.
385 err = amdtp_domain_start(&oxfw->domain, tx_init_skip_cycles, replay_seq, false);
386 if (err < 0)
387 goto error;
388
389 if (!amdtp_domain_wait_ready(&oxfw->domain, READY_TIMEOUT_MS)) {
390 err = -ETIMEDOUT;
391 goto error;
392 }
393 }
394
395 return 0;
396 error:
397 amdtp_domain_stop(&oxfw->domain);
398
399 cmp_connection_break(&oxfw->in_conn);
400 if (oxfw->has_output)
401 cmp_connection_break(&oxfw->out_conn);
402
403 return err;
404 }
405
406 void snd_oxfw_stream_stop_duplex(struct snd_oxfw *oxfw)
407 {
408 if (oxfw->substreams_count == 0) {
409 amdtp_domain_stop(&oxfw->domain);
410
411 cmp_connection_break(&oxfw->in_conn);
412 cmp_connection_release(&oxfw->in_conn);
413
414 if (oxfw->has_output) {
415 cmp_connection_break(&oxfw->out_conn);
416 cmp_connection_release(&oxfw->out_conn);
417 }
418 }
419 }
420
421 static void destroy_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
422 {
423 struct cmp_connection *conn;
424
425 if (stream == &oxfw->tx_stream)
426 conn = &oxfw->out_conn;
427 else
428 conn = &oxfw->in_conn;
429
430 amdtp_stream_destroy(stream);
431 cmp_connection_destroy(conn);
432 }
433
434 int snd_oxfw_stream_init_duplex(struct snd_oxfw *oxfw)
435 {
436 int err;
437
438 err = init_stream(oxfw, &oxfw->rx_stream);
439 if (err < 0)
440 return err;
441
442 if (oxfw->has_output) {
443 err = init_stream(oxfw, &oxfw->tx_stream);
444 if (err < 0) {
445 destroy_stream(oxfw, &oxfw->rx_stream);
446 return err;
447 }
448 }
449
450 err = amdtp_domain_init(&oxfw->domain);
451 if (err < 0) {
452 destroy_stream(oxfw, &oxfw->rx_stream);
453 if (oxfw->has_output)
454 destroy_stream(oxfw, &oxfw->tx_stream);
455 }
456
457 return err;
458 }
459
460 // This function should be called before starting the stream or after stopping
461 // the streams.
462 void snd_oxfw_stream_destroy_duplex(struct snd_oxfw *oxfw)
463 {
464 amdtp_domain_destroy(&oxfw->domain);
465
466 destroy_stream(oxfw, &oxfw->rx_stream);
467
468 if (oxfw->has_output)
469 destroy_stream(oxfw, &oxfw->tx_stream);
470 }
471
472 void snd_oxfw_stream_update_duplex(struct snd_oxfw *oxfw)
473 {
474 amdtp_domain_stop(&oxfw->domain);
475
476 cmp_connection_break(&oxfw->in_conn);
477
478 amdtp_stream_pcm_abort(&oxfw->rx_stream);
479
480 if (oxfw->has_output) {
481 cmp_connection_break(&oxfw->out_conn);
482
483 amdtp_stream_pcm_abort(&oxfw->tx_stream);
484 }
485 }
486
487 int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw,
488 enum avc_general_plug_dir dir,
489 struct snd_oxfw_stream_formation *formation)
490 {
491 int err;
492
493 if (!(oxfw->quirks & SND_OXFW_QUIRK_STREAM_FORMAT_INFO_UNSUPPORTED)) {
494 u8 *format;
495 unsigned int len;
496
497 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
498 format = kmalloc(len, GFP_KERNEL);
499 if (format == NULL)
500 return -ENOMEM;
501
502 err = avc_stream_get_format_single(oxfw->unit, dir, 0, format, &len);
503 if (err >= 0) {
504 if (len < 3)
505 err = -EIO;
506 else
507 err = snd_oxfw_stream_parse_format(format, formation);
508 }
509
510 kfree(format);
511 } else {
512 // Miglia Harmony Audio does not support Extended Stream Format Information
513 // command. Use the duplicated hard-coded format, instead.
514 unsigned int rate;
515 u8 *const *formats;
516 int i;
517
518 err = avc_general_get_sig_fmt(oxfw->unit, &rate, dir, 0);
519 if (err < 0)
520 return err;
521
522 if (dir == AVC_GENERAL_PLUG_DIR_IN)
523 formats = oxfw->rx_stream_formats;
524 else
525 formats = oxfw->tx_stream_formats;
526
527 for (i = 0; (i < SND_OXFW_STREAM_FORMAT_ENTRIES); ++i) {
528 if (!formats[i])
529 continue;
530
531 err = snd_oxfw_stream_parse_format(formats[i], formation);
532 if (err < 0)
533 continue;
534
535 if (formation->rate == rate)
536 break;
537 }
538 if (i == SND_OXFW_STREAM_FORMAT_ENTRIES)
539 return -EIO;
540 }
541
542 return err;
543 }
544
545 /*
546 * See Table 6.16 - AM824 Stream Format
547 * Figure 6.19 - format_information field for AM824 Compound
548 * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA)
549 * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
550 */
551 int snd_oxfw_stream_parse_format(const u8 *format,
552 struct snd_oxfw_stream_formation *formation)
553 {
554 unsigned int i, e, channels, type;
555
556 memset(formation, 0, sizeof(struct snd_oxfw_stream_formation));
557
558 /*
559 * this module can support a hierarchy combination that:
560 * Root: Audio and Music (0x90)
561 * Level 1: AM824 Compound (0x40)
562 */
563 if ((format[0] != 0x90) || (format[1] != 0x40))
564 return -ENXIO;
565
566 /* check the sampling rate */
567 for (i = 0; i < ARRAY_SIZE(avc_stream_rate_table); i++) {
568 if (format[2] == avc_stream_rate_table[i])
569 break;
570 }
571 if (i == ARRAY_SIZE(avc_stream_rate_table))
572 return -ENXIO;
573
574 formation->rate = oxfw_rate_table[i];
575
576 for (e = 0; e < format[4]; e++) {
577 channels = format[5 + e * 2];
578 type = format[6 + e * 2];
579
580 switch (type) {
581 /* IEC 60958 Conformant, currently handled as MBLA */
582 case 0x00:
583 /* Multi Bit Linear Audio (Raw) */
584 case 0x06:
585 formation->pcm += channels;
586 break;
587 /* MIDI Conformant */
588 case 0x0d:
589 formation->midi = channels;
590 break;
591 /* IEC 61937-3 to 7 */
592 case 0x01:
593 case 0x02:
594 case 0x03:
595 case 0x04:
596 case 0x05:
597 /* Multi Bit Linear Audio */
598 case 0x07: /* DVD-Audio */
599 case 0x0c: /* High Precision */
600 /* One Bit Audio */
601 case 0x08: /* (Plain) Raw */
602 case 0x09: /* (Plain) SACD */
603 case 0x0a: /* (Encoded) Raw */
604 case 0x0b: /* (Encoded) SACD */
605 /* SMPTE Time-Code conformant */
606 case 0x0e:
607 /* Sample Count */
608 case 0x0f:
609 /* Anciliary Data */
610 case 0x10:
611 /* Synchronization Stream (Stereo Raw audio) */
612 case 0x40:
613 /* Don't care */
614 case 0xff:
615 default:
616 return -ENXIO; /* not supported */
617 }
618 }
619
620 if (formation->pcm > AM824_MAX_CHANNELS_FOR_PCM ||
621 formation->midi > AM824_MAX_CHANNELS_FOR_MIDI)
622 return -ENXIO;
623
624 return 0;
625 }
626
627 static int
628 assume_stream_formats(struct snd_oxfw *oxfw, enum avc_general_plug_dir dir,
629 unsigned int pid, u8 *buf, unsigned int *len,
630 u8 **formats)
631 {
632 struct snd_oxfw_stream_formation formation;
633 unsigned int i, eid;
634 int err;
635
636 // get format at current sampling rate.
637 if (!(oxfw->quirks & SND_OXFW_QUIRK_STREAM_FORMAT_INFO_UNSUPPORTED)) {
638 err = avc_stream_get_format_single(oxfw->unit, dir, pid, buf, len);
639 if (err < 0) {
640 dev_err(&oxfw->unit->device,
641 "fail to get current stream format for isoc %s plug %d:%d\n",
642 (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out",
643 pid, err);
644 goto end;
645 }
646 } else {
647 // Miglia Harmony Audio does not support Extended Stream Format Information
648 // command. Use the hard-coded format, instead.
649 buf[0] = 0x90;
650 buf[1] = 0x40;
651 buf[2] = avc_stream_rate_table[0];
652 buf[3] = 0x00;
653 buf[4] = 0x01;
654
655 if (dir == AVC_GENERAL_PLUG_DIR_IN)
656 buf[5] = 0x08;
657 else
658 buf[5] = 0x02;
659
660 buf[6] = 0x06;
661
662 *len = 7;
663 }
664
665 /* parse and set stream format */
666 eid = 0;
667 err = snd_oxfw_stream_parse_format(buf, &formation);
668 if (err < 0)
669 goto end;
670
671 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len,
672 GFP_KERNEL);
673 if (!formats[eid]) {
674 err = -ENOMEM;
675 goto end;
676 }
677
678 /* apply the format for each available sampling rate */
679 for (i = 0; i < ARRAY_SIZE(oxfw_rate_table); i++) {
680 if (formation.rate == oxfw_rate_table[i])
681 continue;
682
683 err = avc_general_inquiry_sig_fmt(oxfw->unit,
684 oxfw_rate_table[i],
685 dir, pid);
686 if (err < 0)
687 continue;
688
689 eid++;
690 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len,
691 GFP_KERNEL);
692 if (formats[eid] == NULL) {
693 err = -ENOMEM;
694 goto end;
695 }
696 formats[eid][2] = avc_stream_rate_table[i];
697 }
698
699 err = 0;
700 oxfw->assumed = true;
701 end:
702 return err;
703 }
704
705 static int fill_stream_formats(struct snd_oxfw *oxfw,
706 enum avc_general_plug_dir dir,
707 unsigned short pid)
708 {
709 u8 *buf, **formats;
710 unsigned int len, eid = 0;
711 struct snd_oxfw_stream_formation dummy;
712 int err;
713
714 buf = kmalloc(AVC_GENERIC_FRAME_MAXIMUM_BYTES, GFP_KERNEL);
715 if (buf == NULL)
716 return -ENOMEM;
717
718 if (dir == AVC_GENERAL_PLUG_DIR_OUT)
719 formats = oxfw->tx_stream_formats;
720 else
721 formats = oxfw->rx_stream_formats;
722
723 /* get first entry */
724 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
725 err = avc_stream_get_format_list(oxfw->unit, dir, 0, buf, &len, 0);
726 if (err == -ENXIO) {
727 /* LIST subfunction is not implemented */
728 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
729 err = assume_stream_formats(oxfw, dir, pid, buf, &len,
730 formats);
731 goto end;
732 } else if (err < 0) {
733 dev_err(&oxfw->unit->device,
734 "fail to get stream format %d for isoc %s plug %d:%d\n",
735 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out",
736 pid, err);
737 goto end;
738 }
739
740 /* LIST subfunction is implemented */
741 while (eid < SND_OXFW_STREAM_FORMAT_ENTRIES) {
742 /* The format is too short. */
743 if (len < 3) {
744 err = -EIO;
745 break;
746 }
747
748 /* parse and set stream format */
749 err = snd_oxfw_stream_parse_format(buf, &dummy);
750 if (err < 0)
751 break;
752
753 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, len,
754 GFP_KERNEL);
755 if (!formats[eid]) {
756 err = -ENOMEM;
757 break;
758 }
759
760 /* get next entry */
761 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
762 err = avc_stream_get_format_list(oxfw->unit, dir, 0,
763 buf, &len, ++eid);
764 /* No entries remained. */
765 if (err == -EINVAL) {
766 err = 0;
767 break;
768 } else if (err < 0) {
769 dev_err(&oxfw->unit->device,
770 "fail to get stream format %d for isoc %s plug %d:%d\n",
771 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" :
772 "out",
773 pid, err);
774 break;
775 }
776 }
777 end:
778 kfree(buf);
779 return err;
780 }
781
782 int snd_oxfw_stream_discover(struct snd_oxfw *oxfw)
783 {
784 u8 plugs[AVC_PLUG_INFO_BUF_BYTES];
785 struct snd_oxfw_stream_formation formation;
786 u8 *format;
787 unsigned int i;
788 int err;
789
790 /* the number of plugs for isoc in/out, ext in/out */
791 err = avc_general_get_plug_info(oxfw->unit, 0x1f, 0x07, 0x00, plugs);
792 if (err < 0) {
793 dev_err(&oxfw->unit->device,
794 "fail to get info for isoc/external in/out plugs: %d\n",
795 err);
796 goto end;
797 } else if ((plugs[0] == 0) && (plugs[1] == 0)) {
798 err = -ENXIO;
799 goto end;
800 }
801
802 /* use oPCR[0] if exists */
803 if (plugs[1] > 0) {
804 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_OUT, 0);
805 if (err < 0) {
806 if (err != -ENXIO)
807 return err;
808
809 // The oPCR is not available for isoc communication.
810 err = 0;
811 } else {
812 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
813 format = oxfw->tx_stream_formats[i];
814 if (format == NULL)
815 continue;
816 err = snd_oxfw_stream_parse_format(format,
817 &formation);
818 if (err < 0)
819 continue;
820
821 /* Add one MIDI port. */
822 if (formation.midi > 0)
823 oxfw->midi_input_ports = 1;
824 }
825
826 oxfw->has_output = true;
827 }
828 }
829
830 /* use iPCR[0] if exists */
831 if (plugs[0] > 0) {
832 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_IN, 0);
833 if (err < 0) {
834 if (err != -ENXIO)
835 return err;
836
837 // The iPCR is not available for isoc communication.
838 err = 0;
839 } else {
840 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
841 format = oxfw->rx_stream_formats[i];
842 if (format == NULL)
843 continue;
844 err = snd_oxfw_stream_parse_format(format,
845 &formation);
846 if (err < 0)
847 continue;
848
849 /* Add one MIDI port. */
850 if (formation.midi > 0)
851 oxfw->midi_output_ports = 1;
852 }
853
854 oxfw->has_input = true;
855 }
856 }
857 end:
858 return err;
859 }
860
861 void snd_oxfw_stream_lock_changed(struct snd_oxfw *oxfw)
862 {
863 oxfw->dev_lock_changed = true;
864 wake_up(&oxfw->hwdep_wait);
865 }
866
867 int snd_oxfw_stream_lock_try(struct snd_oxfw *oxfw)
868 {
869 int err;
870
871 spin_lock_irq(&oxfw->lock);
872
873 /* user land lock this */
874 if (oxfw->dev_lock_count < 0) {
875 err = -EBUSY;
876 goto end;
877 }
878
879 /* this is the first time */
880 if (oxfw->dev_lock_count++ == 0)
881 snd_oxfw_stream_lock_changed(oxfw);
882 err = 0;
883 end:
884 spin_unlock_irq(&oxfw->lock);
885 return err;
886 }
887
888 void snd_oxfw_stream_lock_release(struct snd_oxfw *oxfw)
889 {
890 spin_lock_irq(&oxfw->lock);
891
892 if (WARN_ON(oxfw->dev_lock_count <= 0))
893 goto end;
894 if (--oxfw->dev_lock_count == 0)
895 snd_oxfw_stream_lock_changed(oxfw);
896 end:
897 spin_unlock_irq(&oxfw->lock);
898 }
899
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