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 CALLBACK_TIMEOUT 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 int err;
157
158 if (stream == &oxfw->tx_stream) {
159 conn = &oxfw->out_conn;
160 c_dir = CMP_OUTPUT;
161 s_dir = AMDTP_IN_STREAM;
162 } else {
163 conn = &oxfw->in_conn;
164 c_dir = CMP_INPUT;
165 s_dir = AMDTP_OUT_STREAM;
166 }
167
168 err = cmp_connection_init(conn, oxfw->unit, c_dir, 0);
169 if (err < 0)
170 return err;
171
172 err = amdtp_am824_init(stream, oxfw->unit, s_dir, CIP_NONBLOCKING);
173 if (err < 0) {
174 cmp_connection_destroy(conn);
175 return err;
176 }
177
178 /*
179 * OXFW starts to transmit packets with non-zero dbc.
180 * OXFW postpone transferring packets till handling any asynchronous
181 * packets. As a result, next isochronous packet includes more data
182 * blocks than IEC 61883-6 defines.
183 */
184 if (stream == &oxfw->tx_stream) {
185 oxfw->tx_stream.flags |= CIP_JUMBO_PAYLOAD;
186 if (oxfw->wrong_dbs)
187 oxfw->tx_stream.flags |= CIP_WRONG_DBS;
188 }
189
190 return 0;
191 }
192
keep_resources(struct snd_oxfw * oxfw,struct amdtp_stream * stream)193 static int keep_resources(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
194 {
195 enum avc_general_plug_dir dir;
196 u8 **formats;
197 struct snd_oxfw_stream_formation formation;
198 struct cmp_connection *conn;
199 int i;
200 int err;
201
202 if (stream == &oxfw->rx_stream) {
203 dir = AVC_GENERAL_PLUG_DIR_IN;
204 formats = oxfw->rx_stream_formats;
205 conn = &oxfw->in_conn;
206 } else {
207 dir = AVC_GENERAL_PLUG_DIR_OUT;
208 formats = oxfw->tx_stream_formats;
209 conn = &oxfw->out_conn;
210 }
211
212 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
213 if (err < 0)
214 return err;
215
216 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
217 struct snd_oxfw_stream_formation fmt;
218
219 if (formats[i] == NULL)
220 break;
221
222 err = snd_oxfw_stream_parse_format(formats[i], &fmt);
223 if (err < 0)
224 return err;
225
226 if (fmt.rate == formation.rate && fmt.pcm == formation.pcm &&
227 fmt.midi == formation.midi)
228 break;
229 }
230 if (i == SND_OXFW_STREAM_FORMAT_ENTRIES)
231 return -EINVAL;
232
233 // The stream should have one pcm channels at least.
234 if (formation.pcm == 0)
235 return -EINVAL;
236
237 err = amdtp_am824_set_parameters(stream, formation.rate, formation.pcm,
238 formation.midi * 8, false);
239 if (err < 0)
240 return err;
241
242 return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream));
243 }
244
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)245 int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw,
246 struct amdtp_stream *stream,
247 unsigned int rate, unsigned int pcm_channels,
248 unsigned int frames_per_period,
249 unsigned int frames_per_buffer)
250 {
251 struct snd_oxfw_stream_formation formation;
252 enum avc_general_plug_dir dir;
253 int err;
254
255 // Considering JACK/FFADO streaming:
256 // TODO: This can be removed hwdep functionality becomes popular.
257 err = check_connection_used_by_others(oxfw, &oxfw->rx_stream);
258 if (err < 0)
259 return err;
260 if (oxfw->has_output) {
261 err = check_connection_used_by_others(oxfw, &oxfw->tx_stream);
262 if (err < 0)
263 return err;
264 }
265
266 if (stream == &oxfw->tx_stream)
267 dir = AVC_GENERAL_PLUG_DIR_OUT;
268 else
269 dir = AVC_GENERAL_PLUG_DIR_IN;
270
271 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
272 if (err < 0)
273 return err;
274 if (rate == 0) {
275 rate = formation.rate;
276 pcm_channels = formation.pcm;
277 }
278 if (formation.rate != rate || formation.pcm != pcm_channels) {
279 amdtp_domain_stop(&oxfw->domain);
280
281 cmp_connection_break(&oxfw->in_conn);
282 cmp_connection_release(&oxfw->in_conn);
283
284 if (oxfw->has_output) {
285 cmp_connection_break(&oxfw->out_conn);
286 cmp_connection_release(&oxfw->out_conn);
287 }
288 }
289
290 if (oxfw->substreams_count == 0 ||
291 formation.rate != rate || formation.pcm != pcm_channels) {
292 err = set_stream_format(oxfw, stream, rate, pcm_channels);
293 if (err < 0) {
294 dev_err(&oxfw->unit->device,
295 "fail to set stream format: %d\n", err);
296 return err;
297 }
298
299 err = keep_resources(oxfw, &oxfw->rx_stream);
300 if (err < 0)
301 return err;
302
303 if (oxfw->has_output) {
304 err = keep_resources(oxfw, &oxfw->tx_stream);
305 if (err < 0) {
306 cmp_connection_release(&oxfw->in_conn);
307 return err;
308 }
309 }
310
311 err = amdtp_domain_set_events_per_period(&oxfw->domain,
312 frames_per_period, frames_per_buffer);
313 if (err < 0) {
314 cmp_connection_release(&oxfw->in_conn);
315 if (oxfw->has_output)
316 cmp_connection_release(&oxfw->out_conn);
317 return err;
318 }
319 }
320
321 return 0;
322 }
323
snd_oxfw_stream_start_duplex(struct snd_oxfw * oxfw)324 int snd_oxfw_stream_start_duplex(struct snd_oxfw *oxfw)
325 {
326 int err;
327
328 if (oxfw->substreams_count == 0)
329 return -EIO;
330
331 if (amdtp_streaming_error(&oxfw->rx_stream) ||
332 amdtp_streaming_error(&oxfw->tx_stream)) {
333 amdtp_domain_stop(&oxfw->domain);
334
335 cmp_connection_break(&oxfw->in_conn);
336 if (oxfw->has_output)
337 cmp_connection_break(&oxfw->out_conn);
338 }
339
340 if (!amdtp_stream_running(&oxfw->rx_stream)) {
341 err = start_stream(oxfw, &oxfw->rx_stream);
342 if (err < 0) {
343 dev_err(&oxfw->unit->device,
344 "fail to prepare rx stream: %d\n", err);
345 goto error;
346 }
347
348 if (oxfw->has_output &&
349 !amdtp_stream_running(&oxfw->tx_stream)) {
350 err = start_stream(oxfw, &oxfw->tx_stream);
351 if (err < 0) {
352 dev_err(&oxfw->unit->device,
353 "fail to prepare tx stream: %d\n", err);
354 goto error;
355 }
356 }
357
358 err = amdtp_domain_start(&oxfw->domain, 0);
359 if (err < 0)
360 goto error;
361
362 // Wait first packet.
363 if (!amdtp_stream_wait_callback(&oxfw->rx_stream,
364 CALLBACK_TIMEOUT)) {
365 err = -ETIMEDOUT;
366 goto error;
367 }
368
369 if (oxfw->has_output) {
370 if (!amdtp_stream_wait_callback(&oxfw->tx_stream,
371 CALLBACK_TIMEOUT)) {
372 err = -ETIMEDOUT;
373 goto error;
374 }
375 }
376 }
377
378 return 0;
379 error:
380 amdtp_domain_stop(&oxfw->domain);
381
382 cmp_connection_break(&oxfw->in_conn);
383 if (oxfw->has_output)
384 cmp_connection_break(&oxfw->out_conn);
385
386 return err;
387 }
388
snd_oxfw_stream_stop_duplex(struct snd_oxfw * oxfw)389 void snd_oxfw_stream_stop_duplex(struct snd_oxfw *oxfw)
390 {
391 if (oxfw->substreams_count == 0) {
392 amdtp_domain_stop(&oxfw->domain);
393
394 cmp_connection_break(&oxfw->in_conn);
395 cmp_connection_release(&oxfw->in_conn);
396
397 if (oxfw->has_output) {
398 cmp_connection_break(&oxfw->out_conn);
399 cmp_connection_release(&oxfw->out_conn);
400 }
401 }
402 }
403
destroy_stream(struct snd_oxfw * oxfw,struct amdtp_stream * stream)404 static void destroy_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
405 {
406 struct cmp_connection *conn;
407
408 if (stream == &oxfw->tx_stream)
409 conn = &oxfw->out_conn;
410 else
411 conn = &oxfw->in_conn;
412
413 amdtp_stream_destroy(stream);
414 cmp_connection_destroy(conn);
415 }
416
snd_oxfw_stream_init_duplex(struct snd_oxfw * oxfw)417 int snd_oxfw_stream_init_duplex(struct snd_oxfw *oxfw)
418 {
419 int err;
420
421 err = init_stream(oxfw, &oxfw->rx_stream);
422 if (err < 0)
423 return err;
424
425 if (oxfw->has_output) {
426 err = init_stream(oxfw, &oxfw->tx_stream);
427 if (err < 0) {
428 destroy_stream(oxfw, &oxfw->rx_stream);
429 return err;
430 }
431 }
432
433 err = amdtp_domain_init(&oxfw->domain);
434 if (err < 0) {
435 destroy_stream(oxfw, &oxfw->rx_stream);
436 if (oxfw->has_output)
437 destroy_stream(oxfw, &oxfw->tx_stream);
438 }
439
440 return err;
441 }
442
443 // This function should be called before starting the stream or after stopping
444 // the streams.
snd_oxfw_stream_destroy_duplex(struct snd_oxfw * oxfw)445 void snd_oxfw_stream_destroy_duplex(struct snd_oxfw *oxfw)
446 {
447 amdtp_domain_destroy(&oxfw->domain);
448
449 destroy_stream(oxfw, &oxfw->rx_stream);
450
451 if (oxfw->has_output)
452 destroy_stream(oxfw, &oxfw->tx_stream);
453 }
454
snd_oxfw_stream_update_duplex(struct snd_oxfw * oxfw)455 void snd_oxfw_stream_update_duplex(struct snd_oxfw *oxfw)
456 {
457 amdtp_domain_stop(&oxfw->domain);
458
459 cmp_connection_break(&oxfw->in_conn);
460
461 amdtp_stream_pcm_abort(&oxfw->rx_stream);
462
463 if (oxfw->has_output) {
464 cmp_connection_break(&oxfw->out_conn);
465
466 amdtp_stream_pcm_abort(&oxfw->tx_stream);
467 }
468 }
469
snd_oxfw_stream_get_current_formation(struct snd_oxfw * oxfw,enum avc_general_plug_dir dir,struct snd_oxfw_stream_formation * formation)470 int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw,
471 enum avc_general_plug_dir dir,
472 struct snd_oxfw_stream_formation *formation)
473 {
474 u8 *format;
475 unsigned int len;
476 int err;
477
478 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
479 format = kmalloc(len, GFP_KERNEL);
480 if (format == NULL)
481 return -ENOMEM;
482
483 err = avc_stream_get_format_single(oxfw->unit, dir, 0, format, &len);
484 if (err < 0)
485 goto end;
486 if (len < 3) {
487 err = -EIO;
488 goto end;
489 }
490
491 err = snd_oxfw_stream_parse_format(format, formation);
492 end:
493 kfree(format);
494 return err;
495 }
496
497 /*
498 * See Table 6.16 - AM824 Stream Format
499 * Figure 6.19 - format_information field for AM824 Compound
500 * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA)
501 * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
502 */
snd_oxfw_stream_parse_format(u8 * format,struct snd_oxfw_stream_formation * formation)503 int snd_oxfw_stream_parse_format(u8 *format,
504 struct snd_oxfw_stream_formation *formation)
505 {
506 unsigned int i, e, channels, type;
507
508 memset(formation, 0, sizeof(struct snd_oxfw_stream_formation));
509
510 /*
511 * this module can support a hierarchy combination that:
512 * Root: Audio and Music (0x90)
513 * Level 1: AM824 Compound (0x40)
514 */
515 if ((format[0] != 0x90) || (format[1] != 0x40))
516 return -ENXIO;
517
518 /* check the sampling rate */
519 for (i = 0; i < ARRAY_SIZE(avc_stream_rate_table); i++) {
520 if (format[2] == avc_stream_rate_table[i])
521 break;
522 }
523 if (i == ARRAY_SIZE(avc_stream_rate_table))
524 return -ENXIO;
525
526 formation->rate = oxfw_rate_table[i];
527
528 for (e = 0; e < format[4]; e++) {
529 channels = format[5 + e * 2];
530 type = format[6 + e * 2];
531
532 switch (type) {
533 /* IEC 60958 Conformant, currently handled as MBLA */
534 case 0x00:
535 /* Multi Bit Linear Audio (Raw) */
536 case 0x06:
537 formation->pcm += channels;
538 break;
539 /* MIDI Conformant */
540 case 0x0d:
541 formation->midi = channels;
542 break;
543 /* IEC 61937-3 to 7 */
544 case 0x01:
545 case 0x02:
546 case 0x03:
547 case 0x04:
548 case 0x05:
549 /* Multi Bit Linear Audio */
550 case 0x07: /* DVD-Audio */
551 case 0x0c: /* High Precision */
552 /* One Bit Audio */
553 case 0x08: /* (Plain) Raw */
554 case 0x09: /* (Plain) SACD */
555 case 0x0a: /* (Encoded) Raw */
556 case 0x0b: /* (Encoded) SACD */
557 /* SMPTE Time-Code conformant */
558 case 0x0e:
559 /* Sample Count */
560 case 0x0f:
561 /* Anciliary Data */
562 case 0x10:
563 /* Synchronization Stream (Stereo Raw audio) */
564 case 0x40:
565 /* Don't care */
566 case 0xff:
567 default:
568 return -ENXIO; /* not supported */
569 }
570 }
571
572 if (formation->pcm > AM824_MAX_CHANNELS_FOR_PCM ||
573 formation->midi > AM824_MAX_CHANNELS_FOR_MIDI)
574 return -ENXIO;
575
576 return 0;
577 }
578
579 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)580 assume_stream_formats(struct snd_oxfw *oxfw, enum avc_general_plug_dir dir,
581 unsigned int pid, u8 *buf, unsigned int *len,
582 u8 **formats)
583 {
584 struct snd_oxfw_stream_formation formation;
585 unsigned int i, eid;
586 int err;
587
588 /* get format at current sampling rate */
589 err = avc_stream_get_format_single(oxfw->unit, dir, pid, buf, len);
590 if (err < 0) {
591 dev_err(&oxfw->unit->device,
592 "fail to get current stream format for isoc %s plug %d:%d\n",
593 (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out",
594 pid, err);
595 goto end;
596 }
597
598 /* parse and set stream format */
599 eid = 0;
600 err = snd_oxfw_stream_parse_format(buf, &formation);
601 if (err < 0)
602 goto end;
603
604 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len,
605 GFP_KERNEL);
606 if (!formats[eid]) {
607 err = -ENOMEM;
608 goto end;
609 }
610
611 /* apply the format for each available sampling rate */
612 for (i = 0; i < ARRAY_SIZE(oxfw_rate_table); i++) {
613 if (formation.rate == oxfw_rate_table[i])
614 continue;
615
616 err = avc_general_inquiry_sig_fmt(oxfw->unit,
617 oxfw_rate_table[i],
618 dir, pid);
619 if (err < 0)
620 continue;
621
622 eid++;
623 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len,
624 GFP_KERNEL);
625 if (formats[eid] == NULL) {
626 err = -ENOMEM;
627 goto end;
628 }
629 formats[eid][2] = avc_stream_rate_table[i];
630 }
631
632 err = 0;
633 oxfw->assumed = true;
634 end:
635 return err;
636 }
637
fill_stream_formats(struct snd_oxfw * oxfw,enum avc_general_plug_dir dir,unsigned short pid)638 static int fill_stream_formats(struct snd_oxfw *oxfw,
639 enum avc_general_plug_dir dir,
640 unsigned short pid)
641 {
642 u8 *buf, **formats;
643 unsigned int len, eid = 0;
644 struct snd_oxfw_stream_formation dummy;
645 int err;
646
647 buf = kmalloc(AVC_GENERIC_FRAME_MAXIMUM_BYTES, GFP_KERNEL);
648 if (buf == NULL)
649 return -ENOMEM;
650
651 if (dir == AVC_GENERAL_PLUG_DIR_OUT)
652 formats = oxfw->tx_stream_formats;
653 else
654 formats = oxfw->rx_stream_formats;
655
656 /* get first entry */
657 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
658 err = avc_stream_get_format_list(oxfw->unit, dir, 0, buf, &len, 0);
659 if (err == -ENXIO) {
660 /* LIST subfunction is not implemented */
661 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
662 err = assume_stream_formats(oxfw, dir, pid, buf, &len,
663 formats);
664 goto end;
665 } else if (err < 0) {
666 dev_err(&oxfw->unit->device,
667 "fail to get stream format %d for isoc %s plug %d:%d\n",
668 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out",
669 pid, err);
670 goto end;
671 }
672
673 /* LIST subfunction is implemented */
674 while (eid < SND_OXFW_STREAM_FORMAT_ENTRIES) {
675 /* The format is too short. */
676 if (len < 3) {
677 err = -EIO;
678 break;
679 }
680
681 /* parse and set stream format */
682 err = snd_oxfw_stream_parse_format(buf, &dummy);
683 if (err < 0)
684 break;
685
686 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, len,
687 GFP_KERNEL);
688 if (!formats[eid]) {
689 err = -ENOMEM;
690 break;
691 }
692
693 /* get next entry */
694 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
695 err = avc_stream_get_format_list(oxfw->unit, dir, 0,
696 buf, &len, ++eid);
697 /* No entries remained. */
698 if (err == -EINVAL) {
699 err = 0;
700 break;
701 } else if (err < 0) {
702 dev_err(&oxfw->unit->device,
703 "fail to get stream format %d for isoc %s plug %d:%d\n",
704 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" :
705 "out",
706 pid, err);
707 break;
708 }
709 }
710 end:
711 kfree(buf);
712 return err;
713 }
714
snd_oxfw_stream_discover(struct snd_oxfw * oxfw)715 int snd_oxfw_stream_discover(struct snd_oxfw *oxfw)
716 {
717 u8 plugs[AVC_PLUG_INFO_BUF_BYTES];
718 struct snd_oxfw_stream_formation formation;
719 u8 *format;
720 unsigned int i;
721 int err;
722
723 /* the number of plugs for isoc in/out, ext in/out */
724 err = avc_general_get_plug_info(oxfw->unit, 0x1f, 0x07, 0x00, plugs);
725 if (err < 0) {
726 dev_err(&oxfw->unit->device,
727 "fail to get info for isoc/external in/out plugs: %d\n",
728 err);
729 goto end;
730 } else if ((plugs[0] == 0) && (plugs[1] == 0)) {
731 err = -ENXIO;
732 goto end;
733 }
734
735 /* use oPCR[0] if exists */
736 if (plugs[1] > 0) {
737 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_OUT, 0);
738 if (err < 0) {
739 if (err != -ENXIO)
740 return err;
741
742 // The oPCR is not available for isoc communication.
743 err = 0;
744 } else {
745 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
746 format = oxfw->tx_stream_formats[i];
747 if (format == NULL)
748 continue;
749 err = snd_oxfw_stream_parse_format(format,
750 &formation);
751 if (err < 0)
752 continue;
753
754 /* Add one MIDI port. */
755 if (formation.midi > 0)
756 oxfw->midi_input_ports = 1;
757 }
758
759 oxfw->has_output = true;
760 }
761 }
762
763 /* use iPCR[0] if exists */
764 if (plugs[0] > 0) {
765 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_IN, 0);
766 if (err < 0) {
767 if (err != -ENXIO)
768 return err;
769
770 // The iPCR is not available for isoc communication.
771 err = 0;
772 } else {
773 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
774 format = oxfw->rx_stream_formats[i];
775 if (format == NULL)
776 continue;
777 err = snd_oxfw_stream_parse_format(format,
778 &formation);
779 if (err < 0)
780 continue;
781
782 /* Add one MIDI port. */
783 if (formation.midi > 0)
784 oxfw->midi_output_ports = 1;
785 }
786
787 oxfw->has_input = true;
788 }
789 }
790 end:
791 return err;
792 }
793
snd_oxfw_stream_lock_changed(struct snd_oxfw * oxfw)794 void snd_oxfw_stream_lock_changed(struct snd_oxfw *oxfw)
795 {
796 oxfw->dev_lock_changed = true;
797 wake_up(&oxfw->hwdep_wait);
798 }
799
snd_oxfw_stream_lock_try(struct snd_oxfw * oxfw)800 int snd_oxfw_stream_lock_try(struct snd_oxfw *oxfw)
801 {
802 int err;
803
804 spin_lock_irq(&oxfw->lock);
805
806 /* user land lock this */
807 if (oxfw->dev_lock_count < 0) {
808 err = -EBUSY;
809 goto end;
810 }
811
812 /* this is the first time */
813 if (oxfw->dev_lock_count++ == 0)
814 snd_oxfw_stream_lock_changed(oxfw);
815 err = 0;
816 end:
817 spin_unlock_irq(&oxfw->lock);
818 return err;
819 }
820
snd_oxfw_stream_lock_release(struct snd_oxfw * oxfw)821 void snd_oxfw_stream_lock_release(struct snd_oxfw *oxfw)
822 {
823 spin_lock_irq(&oxfw->lock);
824
825 if (WARN_ON(oxfw->dev_lock_count <= 0))
826 goto end;
827 if (--oxfw->dev_lock_count == 0)
828 snd_oxfw_stream_lock_changed(oxfw);
829 end:
830 spin_unlock_irq(&oxfw->lock);
831 }
832
