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ALSA: oxfw: fix NULL pointer dereference to unused stream structure
[linux-2.6-block.git] / sound / firewire / oxfw / oxfw-stream.c
CommitLineData
da607e19 1// SPDX-License-Identifier: GPL-2.0-only
e2786ca6
TS		 2/*
3 * oxfw_stream.c - a part of driver for OXFW970/971 based devices
4 *
5 * Copyright (c) 2014 Takashi Sakamoto
e2786ca6
TS		 6 */
7
8#include "oxfw.h"
f3699e2c 9#include <linux/delay.h>
e2786ca6 10
5cd1d3f4 11#define AVC_GENERIC_FRAME_MAXIMUM_BYTES 512
f3699e2c 12#define CALLBACK_TIMEOUT 200
5cd1d3f4
TS		 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 */
19static 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 */
32static 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
b0ac0009
TS		 41static 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);
53end:
54 return err;
55}
56
f3699e2c
TS		 57static 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;
5580ba7b
DC		 63 unsigned int len;
64 int i, err;
f3699e2c 65
b0ac0009
TS		 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 }
f3699e2c
TS		 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)
b0ac0009 88 return set_rate(oxfw, rate);
f3699e2c
TS		 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
521b2e11 103static int start_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
e2786ca6 104{
f3699e2c 105 struct cmp_connection *conn;
f3699e2c 106 int err;
e2786ca6 107
0356ce3a 108 if (stream == &oxfw->rx_stream)
b0ac0009 109 conn = &oxfw->in_conn;
0356ce3a 110 else
b0ac0009 111 conn = &oxfw->out_conn;
e2786ca6 112
7bc93821 113 err = cmp_connection_establish(conn);
e2786ca6 114 if (err < 0)
e34244dd 115 return err;
e2786ca6 116
ac5d7786
TS		 117 err = amdtp_domain_add_stream(&oxfw->domain, stream,
118 conn->resources.channel, conn->speed);
f3699e2c
TS		 119 if (err < 0) {
120 cmp_connection_break(conn);
e34244dd 121 return err;
f3699e2c
TS		 122 }
123
e34244dd 124 return 0;
f3699e2c
TS		 125}
126
b0ac0009
TS		 127static int check_connection_used_by_others(struct snd_oxfw *oxfw,
128 struct amdtp_stream *stream)
f3699e2c 129{
b0ac0009
TS		 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
779f0dba 151static int init_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
b0ac0009
TS		 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)
779f0dba 170 return err;
b0ac0009 171
5955815e 172 err = amdtp_am824_init(stream, oxfw->unit, s_dir, CIP_NONBLOCKING);
b0ac0009 173 if (err < 0) {
b0ac0009 174 cmp_connection_destroy(conn);
779f0dba 175 return err;
b0ac0009
TS		 176 }
177
a2064710
TS		 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 */
13f3a46d 184 if (stream == &oxfw->tx_stream) {
62f00e40 185 oxfw->tx_stream.flags |= CIP_JUMBO_PAYLOAD;
13f3a46d
TS		 186 if (oxfw->wrong_dbs)
187 oxfw->tx_stream.flags |= CIP_WRONG_DBS;
188 }
779f0dba
TS		 189
190 return 0;
b0ac0009
TS		 191}
192
0356ce3a
TS		 193static 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;
7bc93821 198 struct cmp_connection *conn;
0356ce3a
TS		 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;
7bc93821 205 conn = &oxfw->in_conn;
0356ce3a
TS		 206 } else {
207 dir = AVC_GENERAL_PLUG_DIR_OUT;
208 formats = oxfw->tx_stream_formats;
7bc93821 209 conn = &oxfw->out_conn;
0356ce3a
TS		 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
7bc93821 237 err = amdtp_am824_set_parameters(stream, formation.rate, formation.pcm,
0356ce3a 238 formation.midi * 8, false);
7bc93821
TS		 239 if (err < 0)
240 return err;
241
242 return cmp_connection_reserve(conn, amdtp_stream_get_max_payload(stream));
0356ce3a
TS		 243}
244
4f380d00
TS		 245int snd_oxfw_stream_reserve_duplex(struct snd_oxfw *oxfw,
246 struct amdtp_stream *stream,
247 unsigned int rate, unsigned int pcm_channels)
b0ac0009 248{
f3699e2c 249 struct snd_oxfw_stream_formation formation;
b0ac0009 250 enum avc_general_plug_dir dir;
4f380d00 251 int err;
b0ac0009 252
20358d44
TS		 253 // Considering JACK/FFADO streaming:
254 // TODO: This can be removed hwdep functionality becomes popular.
255 err = check_connection_used_by_others(oxfw, &oxfw->rx_stream);
256 if (err < 0)
257 return err;
258 if (oxfw->has_output) {
259 err = check_connection_used_by_others(oxfw, &oxfw->tx_stream);
260 if (err < 0)
261 return err;
b0ac0009
TS		 262 }
263
20358d44
TS		 264 if (stream == &oxfw->tx_stream)
265 dir = AVC_GENERAL_PLUG_DIR_OUT;
266 else
267 dir = AVC_GENERAL_PLUG_DIR_IN;
b0ac0009 268
b0ac0009 269 err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
e2786ca6 270 if (err < 0)
20358d44 271 return err;
4f380d00 272 if (rate == 0) {
05588d34 273 rate = formation.rate;
05588d34 274 pcm_channels = formation.pcm;
4f380d00
TS		 275 }
276 if (formation.rate != rate || formation.pcm != pcm_channels) {
ac5d7786
TS		 277 amdtp_domain_stop(&oxfw->domain);
278
e34244dd 279 cmp_connection_break(&oxfw->in_conn);
3f2ce83d 280 cmp_connection_release(&oxfw->in_conn);
e34244dd
TS		 281
282 if (oxfw->has_output) {
e34244dd 283 cmp_connection_break(&oxfw->out_conn);
3f2ce83d 284 cmp_connection_release(&oxfw->out_conn);
e34244dd 285 }
4f380d00 286 }
f3699e2c 287
4f380d00
TS		 288 if (oxfw->substreams_count == 0 ||
289 formation.rate != rate || formation.pcm != pcm_channels) {
b0ac0009 290 err = set_stream_format(oxfw, stream, rate, pcm_channels);
f3699e2c
TS		 291 if (err < 0) {
292 dev_err(&oxfw->unit->device,
293 "fail to set stream format: %d\n", err);
20358d44 294 return err;
f3699e2c 295 }
0356ce3a
TS		 296
297 err = keep_resources(oxfw, &oxfw->rx_stream);
298 if (err < 0)
299 return err;
300
301 if (oxfw->has_output) {
302 err = keep_resources(oxfw, &oxfw->tx_stream);
7bc93821
TS		 303 if (err < 0) {
304 cmp_connection_release(&oxfw->in_conn);
0356ce3a 305 return err;
7bc93821 306 }
0356ce3a 307 }
20358d44 308 }
b0ac0009 309
4f380d00
TS		 310 return 0;
311}
312
313int snd_oxfw_stream_start_duplex(struct snd_oxfw *oxfw)
314{
315 int err;
316
317 if (oxfw->substreams_count == 0)
318 return -EIO;
319
320 if (amdtp_streaming_error(&oxfw->rx_stream) ||
321 amdtp_streaming_error(&oxfw->tx_stream)) {
ac5d7786 322 amdtp_domain_stop(&oxfw->domain);
4f380d00 323
ac5d7786
TS		 324 cmp_connection_break(&oxfw->in_conn);
325 if (oxfw->has_output)
4f380d00 326 cmp_connection_break(&oxfw->out_conn);
4f380d00
TS		 327 }
328
20358d44
TS		 329 if (!amdtp_stream_running(&oxfw->rx_stream)) {
330 err = start_stream(oxfw, &oxfw->rx_stream);
331 if (err < 0) {
332 dev_err(&oxfw->unit->device,
ac5d7786 333 "fail to prepare rx stream: %d\n", err);
20358d44
TS		 334 goto error;
335 }
20358d44 336
ac5d7786
TS		 337 if (oxfw->has_output &&
338 !amdtp_stream_running(&oxfw->tx_stream)) {
20358d44 339 err = start_stream(oxfw, &oxfw->tx_stream);
b0ac0009
TS		 340 if (err < 0) {
341 dev_err(&oxfw->unit->device,
ac5d7786 342 "fail to prepare tx stream: %d\n", err);
20358d44 343 goto error;
b0ac0009
TS		 344 }
345 }
ac5d7786
TS		 346
347 err = amdtp_domain_start(&oxfw->domain);
348 if (err < 0)
349 goto error;
350
351 // Wait first packet.
352 if (!amdtp_stream_wait_callback(&oxfw->rx_stream,
ac5d7786
TS		 353 CALLBACK_TIMEOUT)) {
354 err = -ETIMEDOUT;
355 goto error;
356 }
357
4c098dab
TS		 358 if (oxfw->has_output) {
359 if (!amdtp_stream_wait_callback(&oxfw->tx_stream,
360 CALLBACK_TIMEOUT)) {
361 err = -ETIMEDOUT;
362 goto error;
363 }
364 }
f3699e2c
TS		 365 }
366
20358d44
TS		 367 return 0;
368error:
ac5d7786
TS		 369 amdtp_domain_stop(&oxfw->domain);
370
20358d44 371 cmp_connection_break(&oxfw->in_conn);
ac5d7786 372 if (oxfw->has_output)
20358d44 373 cmp_connection_break(&oxfw->out_conn);
ac5d7786 374
e2786ca6
TS		 375 return err;
376}
377
779f0dba 378void snd_oxfw_stream_stop_duplex(struct snd_oxfw *oxfw)
e2786ca6 379{
4a0a0472 380 if (oxfw->substreams_count == 0) {
ac5d7786
TS		 381 amdtp_domain_stop(&oxfw->domain);
382
e34244dd 383 cmp_connection_break(&oxfw->in_conn);
7bc93821 384 cmp_connection_release(&oxfw->in_conn);
b0ac0009 385
e34244dd 386 if (oxfw->has_output) {
e34244dd 387 cmp_connection_break(&oxfw->out_conn);
7bc93821 388 cmp_connection_release(&oxfw->out_conn);
e34244dd 389 }
20358d44 390 }
e2786ca6
TS		 391}
392
779f0dba 393static void destroy_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
e2786ca6 394{
b0ac0009
TS		 395 struct cmp_connection *conn;
396
397 if (stream == &oxfw->tx_stream)
398 conn = &oxfw->out_conn;
399 else
400 conn = &oxfw->in_conn;
e2786ca6 401
b0ac0009
TS		 402 amdtp_stream_destroy(stream);
403 cmp_connection_destroy(conn);
e2786ca6
TS		 404}
405
779f0dba
TS		 406int snd_oxfw_stream_init_duplex(struct snd_oxfw *oxfw)
407{
408 int err;
409
410 err = init_stream(oxfw, &oxfw->rx_stream);
411 if (err < 0)
412 return err;
413
414 if (oxfw->has_output) {
415 err = init_stream(oxfw, &oxfw->tx_stream);
416 if (err < 0) {
417 destroy_stream(oxfw, &oxfw->rx_stream);
418 return err;
419 }
420 }
421
ac5d7786
TS		 422 err = amdtp_domain_init(&oxfw->domain);
423 if (err < 0) {
424 destroy_stream(oxfw, &oxfw->rx_stream);
425 if (oxfw->has_output)
426 destroy_stream(oxfw, &oxfw->tx_stream);
427 }
428
429 return err;
779f0dba
TS		 430}
431
432// This function should be called before starting the stream or after stopping
433// the streams.
434void snd_oxfw_stream_destroy_duplex(struct snd_oxfw *oxfw)
435{
ac5d7786
TS		 436 amdtp_domain_destroy(&oxfw->domain);
437
779f0dba
TS		 438 destroy_stream(oxfw, &oxfw->rx_stream);
439
440 if (oxfw->has_output)
441 destroy_stream(oxfw, &oxfw->tx_stream);
442}
443
444void snd_oxfw_stream_update_duplex(struct snd_oxfw *oxfw)
e2786ca6 445{
ac5d7786
TS		 446 amdtp_domain_stop(&oxfw->domain);
447
e34244dd 448 cmp_connection_break(&oxfw->in_conn);
b0ac0009 449
e34244dd
TS		 450 amdtp_stream_pcm_abort(&oxfw->rx_stream);
451
452 if (oxfw->has_output) {
e34244dd
TS		 453 cmp_connection_break(&oxfw->out_conn);
454
455 amdtp_stream_pcm_abort(&oxfw->tx_stream);
456 }
e2786ca6 457}
5cd1d3f4 458
3c96101f
TS		 459int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw,
460 enum avc_general_plug_dir dir,
461 struct snd_oxfw_stream_formation *formation)
462{
463 u8 *format;
464 unsigned int len;
465 int err;
466
467 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
468 format = kmalloc(len, GFP_KERNEL);
469 if (format == NULL)
470 return -ENOMEM;
471
472 err = avc_stream_get_format_single(oxfw->unit, dir, 0, format, &len);
473 if (err < 0)
474 goto end;
475 if (len < 3) {
476 err = -EIO;
477 goto end;
478 }
479
480 err = snd_oxfw_stream_parse_format(format, formation);
481end:
482 kfree(format);
483 return err;
484}
485
5cd1d3f4
TS		 486/*
487 * See Table 6.16 - AM824 Stream Format
488 * Figure 6.19 - format_information field for AM824 Compound
489 * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA)
490 * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
491 */
492int snd_oxfw_stream_parse_format(u8 *format,
493 struct snd_oxfw_stream_formation *formation)
494{
495 unsigned int i, e, channels, type;
496
497 memset(formation, 0, sizeof(struct snd_oxfw_stream_formation));
498
499 /*
500 * this module can support a hierarchy combination that:
501 * Root: Audio and Music (0x90)
502 * Level 1: AM824 Compound (0x40)
503 */
504 if ((format[0] != 0x90) || (format[1] != 0x40))
505 return -ENOSYS;
506
507 /* check the sampling rate */
508 for (i = 0; i < ARRAY_SIZE(avc_stream_rate_table); i++) {
509 if (format[2] == avc_stream_rate_table[i])
510 break;
511 }
512 if (i == ARRAY_SIZE(avc_stream_rate_table))
513 return -ENOSYS;
514
515 formation->rate = oxfw_rate_table[i];
516
517 for (e = 0; e < format[4]; e++) {
518 channels = format[5 + e * 2];
519 type = format[6 + e * 2];
520
521 switch (type) {
522 /* IEC 60958 Conformant, currently handled as MBLA */
523 case 0x00:
524 /* Multi Bit Linear Audio (Raw) */
525 case 0x06:
526 formation->pcm += channels;
527 break;
528 /* MIDI Conformant */
529 case 0x0d:
530 formation->midi = channels;
531 break;
532 /* IEC 61937-3 to 7 */
533 case 0x01:
534 case 0x02:
535 case 0x03:
536 case 0x04:
537 case 0x05:
538 /* Multi Bit Linear Audio */
539 case 0x07: /* DVD-Audio */
540 case 0x0c: /* High Precision */
541 /* One Bit Audio */
542 case 0x08: /* (Plain) Raw */
543 case 0x09: /* (Plain) SACD */
544 case 0x0a: /* (Encoded) Raw */
545 case 0x0b: /* (Encoded) SACD */
546 /* SMPTE Time-Code conformant */
547 case 0x0e:
548 /* Sample Count */
549 case 0x0f:
550 /* Anciliary Data */
551 case 0x10:
552 /* Synchronization Stream (Stereo Raw audio) */
553 case 0x40:
554 /* Don't care */
555 case 0xff:
556 default:
557 return -ENOSYS; /* not supported */
558 }
559 }
560
49c7b3fc
TS		 561 if (formation->pcm > AM824_MAX_CHANNELS_FOR_PCM ||
562 formation->midi > AM824_MAX_CHANNELS_FOR_MIDI)
5cd1d3f4
TS		 563 return -ENOSYS;
564
565 return 0;
566}
567
568static int
569assume_stream_formats(struct snd_oxfw *oxfw, enum avc_general_plug_dir dir,
570 unsigned int pid, u8 *buf, unsigned int *len,
571 u8 **formats)
572{
573 struct snd_oxfw_stream_formation formation;
574 unsigned int i, eid;
575 int err;
576
577 /* get format at current sampling rate */
578 err = avc_stream_get_format_single(oxfw->unit, dir, pid, buf, len);
579 if (err < 0) {
580 dev_err(&oxfw->unit->device,
581 "fail to get current stream format for isoc %s plug %d:%d\n",
582 (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out",
583 pid, err);
584 goto end;
585 }
586
587 /* parse and set stream format */
588 eid = 0;
589 err = snd_oxfw_stream_parse_format(buf, &formation);
590 if (err < 0)
591 goto end;
592
cd3b7116
TS		 593 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len,
594 GFP_KERNEL);
595 if (!formats[eid]) {
5cd1d3f4
TS		 596 err = -ENOMEM;
597 goto end;
598 }
5cd1d3f4
TS		 599
600 /* apply the format for each available sampling rate */
601 for (i = 0; i < ARRAY_SIZE(oxfw_rate_table); i++) {
602 if (formation.rate == oxfw_rate_table[i])
603 continue;
604
605 err = avc_general_inquiry_sig_fmt(oxfw->unit,
606 oxfw_rate_table[i],
607 dir, pid);
608 if (err < 0)
609 continue;
610
611 eid++;
cd3b7116
TS		 612 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, *len,
613 GFP_KERNEL);
5cd1d3f4
TS		 614 if (formats[eid] == NULL) {
615 err = -ENOMEM;
616 goto end;
617 }
5cd1d3f4
TS		 618 formats[eid][2] = avc_stream_rate_table[i];
619 }
620
621 err = 0;
622 oxfw->assumed = true;
623end:
624 return err;
625}
626
627static int fill_stream_formats(struct snd_oxfw *oxfw,
628 enum avc_general_plug_dir dir,
629 unsigned short pid)
630{
631 u8 *buf, **formats;
632 unsigned int len, eid = 0;
633 struct snd_oxfw_stream_formation dummy;
634 int err;
635
636 buf = kmalloc(AVC_GENERIC_FRAME_MAXIMUM_BYTES, GFP_KERNEL);
637 if (buf == NULL)
638 return -ENOMEM;
639
b0ac0009
TS		 640 if (dir == AVC_GENERAL_PLUG_DIR_OUT)
641 formats = oxfw->tx_stream_formats;
642 else
643 formats = oxfw->rx_stream_formats;
5cd1d3f4
TS		 644
645 /* get first entry */
646 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
647 err = avc_stream_get_format_list(oxfw->unit, dir, 0, buf, &len, 0);
648 if (err == -ENOSYS) {
649 /* LIST subfunction is not implemented */
650 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
651 err = assume_stream_formats(oxfw, dir, pid, buf, &len,
652 formats);
653 goto end;
654 } else if (err < 0) {
655 dev_err(&oxfw->unit->device,
656 "fail to get stream format %d for isoc %s plug %d:%d\n",
657 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out",
658 pid, err);
659 goto end;
660 }
661
662 /* LIST subfunction is implemented */
663 while (eid < SND_OXFW_STREAM_FORMAT_ENTRIES) {
664 /* The format is too short. */
665 if (len < 3) {
666 err = -EIO;
667 break;
668 }
669
670 /* parse and set stream format */
671 err = snd_oxfw_stream_parse_format(buf, &dummy);
672 if (err < 0)
673 break;
674
cd3b7116
TS		 675 formats[eid] = devm_kmemdup(&oxfw->card->card_dev, buf, len,
676 GFP_KERNEL);
677 if (!formats[eid]) {
5cd1d3f4
TS		 678 err = -ENOMEM;
679 break;
680 }
5cd1d3f4
TS		 681
682 /* get next entry */
683 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
684 err = avc_stream_get_format_list(oxfw->unit, dir, 0,
685 buf, &len, ++eid);
686 /* No entries remained. */
687 if (err == -EINVAL) {
688 err = 0;
689 break;
690 } else if (err < 0) {
691 dev_err(&oxfw->unit->device,
692 "fail to get stream format %d for isoc %s plug %d:%d\n",
693 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" :
694 "out",
695 pid, err);
696 break;
697 }
698 }
699end:
700 kfree(buf);
701 return err;
702}
703
704int snd_oxfw_stream_discover(struct snd_oxfw *oxfw)
705{
706 u8 plugs[AVC_PLUG_INFO_BUF_BYTES];
32056041
TS		 707 struct snd_oxfw_stream_formation formation;
708 u8 *format;
709 unsigned int i;
5cd1d3f4
TS		 710 int err;
711
712 /* the number of plugs for isoc in/out, ext in/out */
713 err = avc_general_get_plug_info(oxfw->unit, 0x1f, 0x07, 0x00, plugs);
714 if (err < 0) {
715 dev_err(&oxfw->unit->device,
716 "fail to get info for isoc/external in/out plugs: %d\n",
717 err);
718 goto end;
b0ac0009 719 } else if ((plugs[0] == 0) && (plugs[1] == 0)) {
5cd1d3f4
TS		 720 err = -ENOSYS;
721 goto end;
722 }
723
b0ac0009
TS		 724 /* use oPCR[0] if exists */
725 if (plugs[1] > 0) {
726 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_OUT, 0);
727 if (err < 0)
728 goto end;
32056041
TS		 729
730 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
731 format = oxfw->tx_stream_formats[i];
732 if (format == NULL)
733 continue;
734 err = snd_oxfw_stream_parse_format(format, &formation);
735 if (err < 0)
736 continue;
737
738 /* Add one MIDI port. */
739 if (formation.midi > 0)
740 oxfw->midi_input_ports = 1;
741 }
742
b0ac0009
TS		 743 oxfw->has_output = true;
744 }
745
5cd1d3f4 746 /* use iPCR[0] if exists */
32056041 747 if (plugs[0] > 0) {
5cd1d3f4 748 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_IN, 0);
32056041
TS		 749 if (err < 0)
750 goto end;
751
752 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
753 format = oxfw->rx_stream_formats[i];
754 if (format == NULL)
755 continue;
756 err = snd_oxfw_stream_parse_format(format, &formation);
757 if (err < 0)
758 continue;
759
760 /* Add one MIDI port. */
761 if (formation.midi > 0)
762 oxfw->midi_output_ports = 1;
763 }
764 }
5cd1d3f4
TS		 765end:
766 return err;
767}
8985f4ac
TS		 768
769void snd_oxfw_stream_lock_changed(struct snd_oxfw *oxfw)
770{
771 oxfw->dev_lock_changed = true;
772 wake_up(&oxfw->hwdep_wait);
773}
774
775int snd_oxfw_stream_lock_try(struct snd_oxfw *oxfw)
776{
777 int err;
778
779 spin_lock_irq(&oxfw->lock);
780
781 /* user land lock this */
782 if (oxfw->dev_lock_count < 0) {
783 err = -EBUSY;
784 goto end;
785 }
786
787 /* this is the first time */
788 if (oxfw->dev_lock_count++ == 0)
789 snd_oxfw_stream_lock_changed(oxfw);
790 err = 0;
791end:
792 spin_unlock_irq(&oxfw->lock);
793 return err;
794}
795
796void snd_oxfw_stream_lock_release(struct snd_oxfw *oxfw)
797{
798 spin_lock_irq(&oxfw->lock);
799
800 if (WARN_ON(oxfw->dev_lock_count <= 0))
801 goto end;
802 if (--oxfw->dev_lock_count == 0)
803 snd_oxfw_stream_lock_changed(oxfw);
804end:
805 spin_unlock_irq(&oxfw->lock);
806}
Linux 6.x block layer and io_uring tree(s)