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 200
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
set_rate(struct snd_oxfw * oxfw,unsigned int rate)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
set_stream_format(struct snd_oxfw * oxfw,struct amdtp_stream * s,unsigned int rate,unsigned int pcm_channels)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
start_stream(struct snd_oxfw * oxfw,struct amdtp_stream * stream)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
check_connection_used_by_others(struct snd_oxfw * oxfw,struct amdtp_stream * stream)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
init_stream(struct snd_oxfw * oxfw,struct amdtp_stream * stream)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 } else {
181 conn = &oxfw->in_conn;
182 c_dir = CMP_INPUT;
183 s_dir = AMDTP_OUT_STREAM;
184 }
185
186 err = cmp_connection_init(conn, oxfw->unit, c_dir, 0);
187 if (err < 0)
188 return err;
189
190 err = amdtp_am824_init(stream, oxfw->unit, s_dir, flags);
191 if (err < 0) {
192 cmp_connection_destroy(conn);
193 return err;
194 }
195
196 return 0;
197 }
198
keep_resources(struct snd_oxfw * oxfw,struct amdtp_stream * stream)199 static int keep_resources(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
200 {
201 enum avc_general_plug_dir dir;
202 u8 **formats;
203 struct snd_oxfw_stream_formation formation;
204 struct cmp_connection *conn;
205 int i;
206 int err;
207
208 if (stream == &oxfw->rx_stream) {
209 dir = AVC_GENERAL_PLUG_DIR_IN;
210 formats = oxfw->rx_stream_formats;
211 conn = &oxfw->in_conn;
212 } else {
213 dir = AVC_GENERAL_PLUG_DIR_OUT;
214 formats = oxfw->tx_stream_formats;
215 conn = &oxfw->out_conn;
216 }
217
218 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
219 if (err < 0)
220 return err;
221
222 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
223 struct snd_oxfw_stream_formation fmt;
224
225 if (formats[i] == NULL)
226 break;
227
228 err = snd_oxfw_stream_parse_format(formats[i], &fmt);
229 if (err < 0)
230 return err;
231
232 if (fmt.rate == formation.rate && fmt.pcm == formation.pcm &&
233 fmt.midi == formation.midi)
234 break;
235 }
236 if (i == SND_OXFW_STREAM_FORMAT_ENTRIES)
237 return -EINVAL;
238
239 // The stream should have one pcm channels at least.
240 if (formation.pcm == 0)
241 return -EINVAL;
242
243 err = amdtp_am824_set_parameters(stream, formation.rate, formation.pcm,
244 formation.midi * 8, false);
245 if (err < 0)
246 return err;
247
248 return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream));
249 }
250
snd_oxfw_stream_reserve_duplex(struct snd_oxfw * oxfw,struct amdtp_stream * stream,unsigned int rate,unsigned int pcm_channels,unsigned int frames_per_period,unsigned int frames_per_buffer)251 int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw,
252 struct amdtp_stream *stream,
253 unsigned int rate, unsigned int pcm_channels,
254 unsigned int frames_per_period,
255 unsigned int frames_per_buffer)
256 {
257 struct snd_oxfw_stream_formation formation;
258 enum avc_general_plug_dir dir;
259 int err;
260
261 // Considering JACK/FFADO streaming:
262 // TODO: This can be removed hwdep functionality becomes popular.
263 err = check_connection_used_by_others(oxfw, &oxfw->rx_stream);
264 if (err < 0)
265 return err;
266 if (oxfw->has_output) {
267 err = check_connection_used_by_others(oxfw, &oxfw->tx_stream);
268 if (err < 0)
269 return err;
270 }
271
272 if (stream == &oxfw->tx_stream)
273 dir = AVC_GENERAL_PLUG_DIR_OUT;
274 else
275 dir = AVC_GENERAL_PLUG_DIR_IN;
276
277 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
278 if (err < 0)
279 return err;
280 if (rate == 0) {
281 rate = formation.rate;
282 pcm_channels = formation.pcm;
283 }
284 if (formation.rate != rate || formation.pcm != pcm_channels) {
285 amdtp_domain_stop(&oxfw->domain);
286
287 cmp_connection_break(&oxfw->in_conn);
288 cmp_connection_release(&oxfw->in_conn);
289
290 if (oxfw->has_output) {
291 cmp_connection_break(&oxfw->out_conn);
292 cmp_connection_release(&oxfw->out_conn);
293 }
294 }
295
296 if (oxfw->substreams_count == 0 ||
297 formation.rate != rate || formation.pcm != pcm_channels) {
298 err = set_stream_format(oxfw, stream, rate, pcm_channels);
299 if (err < 0) {
300 dev_err(&oxfw->unit->device,
301 "fail to set stream format: %d\n", err);
302 return err;
303 }
304
305 err = keep_resources(oxfw, &oxfw->rx_stream);
306 if (err < 0)
307 return err;
308
309 if (oxfw->has_output) {
310 err = keep_resources(oxfw, &oxfw->tx_stream);
311 if (err < 0) {
312 cmp_connection_release(&oxfw->in_conn);
313 return err;
314 }
315 }
316
317 err = amdtp_domain_set_events_per_period(&oxfw->domain,
318 frames_per_period, frames_per_buffer);
319 if (err < 0) {
320 cmp_connection_release(&oxfw->in_conn);
321 if (oxfw->has_output)
322 cmp_connection_release(&oxfw->out_conn);
323 return err;
324 }
325 }
326
327 return 0;
328 }
329
snd_oxfw_stream_start_duplex(struct snd_oxfw * oxfw)330 int snd_oxfw_stream_start_duplex(struct snd_oxfw *oxfw)
331 {
332 int err;
333
334 if (oxfw->substreams_count == 0)
335 return -EIO;
336
337 if (amdtp_streaming_error(&oxfw->rx_stream) ||
338 amdtp_streaming_error(&oxfw->tx_stream)) {
339 amdtp_domain_stop(&oxfw->domain);
340
341 cmp_connection_break(&oxfw->in_conn);
342 if (oxfw->has_output)
343 cmp_connection_break(&oxfw->out_conn);
344 }
345
346 if (!amdtp_stream_running(&oxfw->rx_stream)) {
347 unsigned int tx_init_skip_cycles = 0;
348 bool replay_seq = false;
349
350 err = start_stream(oxfw, &oxfw->rx_stream);
351 if (err < 0) {
352 dev_err(&oxfw->unit->device,
353 "fail to prepare rx stream: %d\n", err);
354 goto error;
355 }
356
357 if (oxfw->has_output &&
358 !amdtp_stream_running(&oxfw->tx_stream)) {
359 err = start_stream(oxfw, &oxfw->tx_stream);
360 if (err < 0) {
361 dev_err(&oxfw->unit->device,
362 "fail to prepare tx stream: %d\n", err);
363 goto error;
364 }
365
366 if (oxfw->quirks & SND_OXFW_QUIRK_JUMBO_PAYLOAD) {
367 // Just after changing sampling transfer frequency, many cycles are
368 // skipped for packet transmission.
369 tx_init_skip_cycles = 400;
370 } else {
371 replay_seq = true;
372 }
373 }
374
375 // NOTE: The device ignores presentation time expressed by the value of syt field
376 // of CIP header in received packets. The sequence of the number of data blocks per
377 // packet is important for media clock recovery.
378 err = amdtp_domain_start(&oxfw->domain, tx_init_skip_cycles, replay_seq, false);
379 if (err < 0)
380 goto error;
381
382 if (!amdtp_domain_wait_ready(&oxfw->domain, READY_TIMEOUT_MS)) {
383 err = -ETIMEDOUT;
384 goto error;
385 }
386 }
387
388 return 0;
389 error:
390 amdtp_domain_stop(&oxfw->domain);
391
392 cmp_connection_break(&oxfw->in_conn);
393 if (oxfw->has_output)
394 cmp_connection_break(&oxfw->out_conn);
395
396 return err;
397 }
398
snd_oxfw_stream_stop_duplex(struct snd_oxfw * oxfw)399 void snd_oxfw_stream_stop_duplex(struct snd_oxfw *oxfw)
400 {
401 if (oxfw->substreams_count == 0) {
402 amdtp_domain_stop(&oxfw->domain);
403
404 cmp_connection_break(&oxfw->in_conn);
405 cmp_connection_release(&oxfw->in_conn);
406
407 if (oxfw->has_output) {
408 cmp_connection_break(&oxfw->out_conn);
409 cmp_connection_release(&oxfw->out_conn);
410 }
411 }
412 }
413
destroy_stream(struct snd_oxfw * oxfw,struct amdtp_stream * stream)414 static void destroy_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
415 {
416 struct cmp_connection *conn;
417
418 if (stream == &oxfw->tx_stream)
419 conn = &oxfw->out_conn;
420 else
421 conn = &oxfw->in_conn;
422
423 amdtp_stream_destroy(stream);
424 cmp_connection_destroy(conn);
425 }
426
snd_oxfw_stream_init_duplex(struct snd_oxfw * oxfw)427 int snd_oxfw_stream_init_duplex(struct snd_oxfw *oxfw)
428 {
429 int err;
430
431 err = init_stream(oxfw, &oxfw->rx_stream);
432 if (err < 0)
433 return err;
434
435 if (oxfw->has_output) {
436 err = init_stream(oxfw, &oxfw->tx_stream);
437 if (err < 0) {
438 destroy_stream(oxfw, &oxfw->rx_stream);
439 return err;
440 }
441 }
442
443 err = amdtp_domain_init(&oxfw->domain);
444 if (err < 0) {
445 destroy_stream(oxfw, &oxfw->rx_stream);
446 if (oxfw->has_output)
447 destroy_stream(oxfw, &oxfw->tx_stream);
448 }
449
450 return err;
451 }
452
453 // This function should be called before starting the stream or after stopping
454 // the streams.
snd_oxfw_stream_destroy_duplex(struct snd_oxfw * oxfw)455 void snd_oxfw_stream_destroy_duplex(struct snd_oxfw *oxfw)
456 {
457 amdtp_domain_destroy(&oxfw->domain);
458
459 destroy_stream(oxfw, &oxfw->rx_stream);
460
461 if (oxfw->has_output)
462 destroy_stream(oxfw, &oxfw->tx_stream);
463 }
464
snd_oxfw_stream_update_duplex(struct snd_oxfw * oxfw)465 void snd_oxfw_stream_update_duplex(struct snd_oxfw *oxfw)
466 {
467 amdtp_domain_stop(&oxfw->domain);
468
469 cmp_connection_break(&oxfw->in_conn);
470
471 amdtp_stream_pcm_abort(&oxfw->rx_stream);
472
473 if (oxfw->has_output) {
474 cmp_connection_break(&oxfw->out_conn);
475
476 amdtp_stream_pcm_abort(&oxfw->tx_stream);
477 }
478 }
479
snd_oxfw_stream_get_current_formation(struct snd_oxfw * oxfw,enum avc_general_plug_dir dir,struct snd_oxfw_stream_formation * formation)480 int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw,
481 enum avc_general_plug_dir dir,
482 struct snd_oxfw_stream_formation *formation)
483 {
484 u8 *format;
485 unsigned int len;
486 int err;
487
488 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
489 format = kmalloc(len, GFP_KERNEL);
490 if (format == NULL)
491 return -ENOMEM;
492
493 err = avc_stream_get_format_single(oxfw->unit, dir, 0, format, &len);
494 if (err < 0)
495 goto end;
496 if (len < 3) {
497 err = -EIO;
498 goto end;
499 }
500
501 err = snd_oxfw_stream_parse_format(format, formation);
502 end:
503 kfree(format);
504 return err;
505 }
506
507 /*
508 * See Table 6.16 - AM824 Stream Format
509 * Figure 6.19 - format_information field for AM824 Compound
510 * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA)
511 * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
512 */
snd_oxfw_stream_parse_format(u8 * format,struct snd_oxfw_stream_formation * formation)513 int snd_oxfw_stream_parse_format(u8 *format,
514 struct snd_oxfw_stream_formation *formation)
515 {
516 unsigned int i, e, channels, type;
517
518 memset(formation, 0, sizeof(struct snd_oxfw_stream_formation));
519
520 /*
521 * this module can support a hierarchy combination that:
522 * Root: Audio and Music (0x90)
523 * Level 1: AM824 Compound (0x40)
524 */
525 if ((format[0] != 0x90) || (format[1] != 0x40))
526 return -ENXIO;
527
528 /* check the sampling rate */
529 for (i = 0; i < ARRAY_SIZE(avc_stream_rate_table); i++) {
530 if (format[2] == avc_stream_rate_table[i])
531 break;
532 }
533 if (i == ARRAY_SIZE(avc_stream_rate_table))
534 return -ENXIO;
535
536 formation->rate = oxfw_rate_table[i];
537
538 for (e = 0; e < format[4]; e++) {
539 channels = format[5 + e * 2];
540 type = format[6 + e * 2];
541
542 switch (type) {
543 /* IEC 60958 Conformant, currently handled as MBLA */
544 case 0x00:
545 /* Multi Bit Linear Audio (Raw) */
546 case 0x06:
547 formation->pcm += channels;
548 break;
549 /* MIDI Conformant */
550 case 0x0d:
551 formation->midi = channels;
552 break;
553 /* IEC 61937-3 to 7 */
554 case 0x01:
555 case 0x02:
556 case 0x03:
557 case 0x04:
558 case 0x05:
559 /* Multi Bit Linear Audio */
560 case 0x07: /* DVD-Audio */
561 case 0x0c: /* High Precision */
562 /* One Bit Audio */
563 case 0x08: /* (Plain) Raw */
564 case 0x09: /* (Plain) SACD */
565 case 0x0a: /* (Encoded) Raw */
566 case 0x0b: /* (Encoded) SACD */
567 /* SMPTE Time-Code conformant */
568 case 0x0e:
569 /* Sample Count */
570 case 0x0f:
571 /* Anciliary Data */
572 case 0x10:
573 /* Synchronization Stream (Stereo Raw audio) */
574 case 0x40:
575 /* Don't care */
576 case 0xff:
577 default:
578 return -ENXIO; /* not supported */
579 }
580 }
581
582 if (formation->pcm > AM824_MAX_CHANNELS_FOR_PCM ||
583 formation->midi > AM824_MAX_CHANNELS_FOR_MIDI)
584 return -ENXIO;
585
586 return 0;
587 }
588
589 static int
assume_stream_formats(struct snd_oxfw * oxfw,enum avc_general_plug_dir dir,unsigned int pid,u8 * buf,unsigned int * len,u8 ** formats)590 assume_stream_formats(struct snd_oxfw *oxfw, enum avc_general_plug_dir dir,
591 unsigned int pid, u8 *buf, unsigned int *len,
592 u8 **formats)
593 {
594 struct snd_oxfw_stream_formation formation;
595 unsigned int i, eid;
596 int err;
597
598 /* get format at current sampling rate */
599 err = avc_stream_get_format_single(oxfw->unit, dir, pid, buf, len);
600 if (err < 0) {
601 dev_err(&oxfw->unit->device,
602 "fail to get current stream format for isoc %s plug %d:%d\n",
603 (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out",
604 pid, err);
605 goto end;
606 }
607
608 /* parse and set stream format */
609 eid = 0;
610 err = snd_oxfw_stream_parse_format(buf, &formation);
611 if (err < 0)
612 goto end;
613
614 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len,
615 GFP_KERNEL);
616 if (!formats[eid]) {
617 err = -ENOMEM;
618 goto end;
619 }
620
621 /* apply the format for each available sampling rate */
622 for (i = 0; i < ARRAY_SIZE(oxfw_rate_table); i++) {
623 if (formation.rate == oxfw_rate_table[i])
624 continue;
625
626 err = avc_general_inquiry_sig_fmt(oxfw->unit,
627 oxfw_rate_table[i],
628 dir, pid);
629 if (err < 0)
630 continue;
631
632 eid++;
633 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len,
634 GFP_KERNEL);
635 if (formats[eid] == NULL) {
636 err = -ENOMEM;
637 goto end;
638 }
639 formats[eid][2] = avc_stream_rate_table[i];
640 }
641
642 err = 0;
643 oxfw->assumed = true;
644 end:
645 return err;
646 }
647
fill_stream_formats(struct snd_oxfw * oxfw,enum avc_general_plug_dir dir,unsigned short pid)648 static int fill_stream_formats(struct snd_oxfw *oxfw,
649 enum avc_general_plug_dir dir,
650 unsigned short pid)
651 {
652 u8 *buf, **formats;
653 unsigned int len, eid = 0;
654 struct snd_oxfw_stream_formation dummy;
655 int err;
656
657 buf = kmalloc(AVC_GENERIC_FRAME_MAXIMUM_BYTES, GFP_KERNEL);
658 if (buf == NULL)
659 return -ENOMEM;
660
661 if (dir == AVC_GENERAL_PLUG_DIR_OUT)
662 formats = oxfw->tx_stream_formats;
663 else
664 formats = oxfw->rx_stream_formats;
665
666 /* get first entry */
667 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
668 err = avc_stream_get_format_list(oxfw->unit, dir, 0, buf, &len, 0);
669 if (err == -ENXIO) {
670 /* LIST subfunction is not implemented */
671 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
672 err = assume_stream_formats(oxfw, dir, pid, buf, &len,
673 formats);
674 goto end;
675 } else if (err < 0) {
676 dev_err(&oxfw->unit->device,
677 "fail to get stream format %d for isoc %s plug %d:%d\n",
678 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out",
679 pid, err);
680 goto end;
681 }
682
683 /* LIST subfunction is implemented */
684 while (eid < SND_OXFW_STREAM_FORMAT_ENTRIES) {
685 /* The format is too short. */
686 if (len < 3) {
687 err = -EIO;
688 break;
689 }
690
691 /* parse and set stream format */
692 err = snd_oxfw_stream_parse_format(buf, &dummy);
693 if (err < 0)
694 break;
695
696 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, len,
697 GFP_KERNEL);
698 if (!formats[eid]) {
699 err = -ENOMEM;
700 break;
701 }
702
703 /* get next entry */
704 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
705 err = avc_stream_get_format_list(oxfw->unit, dir, 0,
706 buf, &len, ++eid);
707 /* No entries remained. */
708 if (err == -EINVAL) {
709 err = 0;
710 break;
711 } else if (err < 0) {
712 dev_err(&oxfw->unit->device,
713 "fail to get stream format %d for isoc %s plug %d:%d\n",
714 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" :
715 "out",
716 pid, err);
717 break;
718 }
719 }
720 end:
721 kfree(buf);
722 return err;
723 }
724
snd_oxfw_stream_discover(struct snd_oxfw * oxfw)725 int snd_oxfw_stream_discover(struct snd_oxfw *oxfw)
726 {
727 u8 plugs[AVC_PLUG_INFO_BUF_BYTES];
728 struct snd_oxfw_stream_formation formation;
729 u8 *format;
730 unsigned int i;
731 int err;
732
733 /* the number of plugs for isoc in/out, ext in/out */
734 err = avc_general_get_plug_info(oxfw->unit, 0x1f, 0x07, 0x00, plugs);
735 if (err < 0) {
736 dev_err(&oxfw->unit->device,
737 "fail to get info for isoc/external in/out plugs: %d\n",
738 err);
739 goto end;
740 } else if ((plugs[0] == 0) && (plugs[1] == 0)) {
741 err = -ENXIO;
742 goto end;
743 }
744
745 /* use oPCR[0] if exists */
746 if (plugs[1] > 0) {
747 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_OUT, 0);
748 if (err < 0) {
749 if (err != -ENXIO)
750 return err;
751
752 // The oPCR is not available for isoc communication.
753 err = 0;
754 } else {
755 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
756 format = oxfw->tx_stream_formats[i];
757 if (format == NULL)
758 continue;
759 err = snd_oxfw_stream_parse_format(format,
760 &formation);
761 if (err < 0)
762 continue;
763
764 /* Add one MIDI port. */
765 if (formation.midi > 0)
766 oxfw->midi_input_ports = 1;
767 }
768
769 oxfw->has_output = true;
770 }
771 }
772
773 /* use iPCR[0] if exists */
774 if (plugs[0] > 0) {
775 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_IN, 0);
776 if (err < 0) {
777 if (err != -ENXIO)
778 return err;
779
780 // The iPCR is not available for isoc communication.
781 err = 0;
782 } else {
783 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
784 format = oxfw->rx_stream_formats[i];
785 if (format == NULL)
786 continue;
787 err = snd_oxfw_stream_parse_format(format,
788 &formation);
789 if (err < 0)
790 continue;
791
792 /* Add one MIDI port. */
793 if (formation.midi > 0)
794 oxfw->midi_output_ports = 1;
795 }
796
797 oxfw->has_input = true;
798 }
799 }
800 end:
801 return err;
802 }
803
snd_oxfw_stream_lock_changed(struct snd_oxfw * oxfw)804 void snd_oxfw_stream_lock_changed(struct snd_oxfw *oxfw)
805 {
806 oxfw->dev_lock_changed = true;
807 wake_up(&oxfw->hwdep_wait);
808 }
809
snd_oxfw_stream_lock_try(struct snd_oxfw * oxfw)810 int snd_oxfw_stream_lock_try(struct snd_oxfw *oxfw)
811 {
812 int err;
813
814 spin_lock_irq(&oxfw->lock);
815
816 /* user land lock this */
817 if (oxfw->dev_lock_count < 0) {
818 err = -EBUSY;
819 goto end;
820 }
821
822 /* this is the first time */
823 if (oxfw->dev_lock_count++ == 0)
824 snd_oxfw_stream_lock_changed(oxfw);
825 err = 0;
826 end:
827 spin_unlock_irq(&oxfw->lock);
828 return err;
829 }
830
snd_oxfw_stream_lock_release(struct snd_oxfw * oxfw)831 void snd_oxfw_stream_lock_release(struct snd_oxfw *oxfw)
832 {
833 spin_lock_irq(&oxfw->lock);
834
835 if (WARN_ON(oxfw->dev_lock_count <= 0))
836 goto end;
837 if (--oxfw->dev_lock_count == 0)
838 snd_oxfw_stream_lock_changed(oxfw);
839 end:
840 spin_unlock_irq(&oxfw->lock);
841 }
842
