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Linux/sound/firewire/oxfw/oxfw-stream.c

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  1 /*
  2  * oxfw_stream.c - a part of driver for OXFW970/971 based devices
  3  *
  4  * Copyright (c) 2014 Takashi Sakamoto
  5  *
  6  * Licensed under the terms of the GNU General Public License, version 2.
  7  */
  8 
  9 #include "oxfw.h"
 10 #include <linux/delay.h>
 11 
 12 #define AVC_GENERIC_FRAME_MAXIMUM_BYTES 512
 13 #define CALLBACK_TIMEOUT        200
 14 
 15 /*
 16  * According to datasheet of Oxford Semiconductor:
 17  *  OXFW970: 32.0/44.1/48.0/96.0 Khz, 8 audio channels I/O
 18  *  OXFW971: 32.0/44.1/48.0/88.2/96.0/192.0 kHz, 16 audio channels I/O, MIDI I/O
 19  */
 20 static const unsigned int oxfw_rate_table[] = {
 21         [0] = 32000,
 22         [1] = 44100,
 23         [2] = 48000,
 24         [3] = 88200,
 25         [4] = 96000,
 26         [5] = 192000,
 27 };
 28 
 29 /*
 30  * See Table 5.7 – Sampling frequency for Multi-bit Audio
 31  * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA)
 32  */
 33 static const unsigned int avc_stream_rate_table[] = {
 34         [0] = 0x02,
 35         [1] = 0x03,
 36         [2] = 0x04,
 37         [3] = 0x0a,
 38         [4] = 0x05,
 39         [5] = 0x07,
 40 };
 41 
 42 static int set_rate(struct snd_oxfw *oxfw, unsigned int rate)
 43 {
 44         int err;
 45 
 46         err = avc_general_set_sig_fmt(oxfw->unit, rate,
 47                                       AVC_GENERAL_PLUG_DIR_IN, 0);
 48         if (err < 0)
 49                 goto end;
 50 
 51         if (oxfw->has_output)
 52                 err = avc_general_set_sig_fmt(oxfw->unit, rate,
 53                                               AVC_GENERAL_PLUG_DIR_OUT, 0);
 54 end:
 55         return err;
 56 }
 57 
 58 static int set_stream_format(struct snd_oxfw *oxfw, struct amdtp_stream *s,
 59                              unsigned int rate, unsigned int pcm_channels)
 60 {
 61         u8 **formats;
 62         struct snd_oxfw_stream_formation formation;
 63         enum avc_general_plug_dir dir;
 64         unsigned int len;
 65         int i, err;
 66 
 67         if (s == &oxfw->tx_stream) {
 68                 formats = oxfw->tx_stream_formats;
 69                 dir = AVC_GENERAL_PLUG_DIR_OUT;
 70         } else {
 71                 formats = oxfw->rx_stream_formats;
 72                 dir = AVC_GENERAL_PLUG_DIR_IN;
 73         }
 74 
 75         /* Seek stream format for requirements. */
 76         for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
 77                 err = snd_oxfw_stream_parse_format(formats[i], &formation);
 78                 if (err < 0)
 79                         return err;
 80 
 81                 if ((formation.rate == rate) && (formation.pcm == pcm_channels))
 82                         break;
 83         }
 84         if (i == SND_OXFW_STREAM_FORMAT_ENTRIES)
 85                 return -EINVAL;
 86 
 87         /* If assumed, just change rate. */
 88         if (oxfw->assumed)
 89                 return set_rate(oxfw, rate);
 90 
 91         /* Calculate format length. */
 92         len = 5 + formats[i][4] * 2;
 93 
 94         err = avc_stream_set_format(oxfw->unit, dir, 0, formats[i], len);
 95         if (err < 0)
 96                 return err;
 97 
 98         /* Some requests just after changing format causes freezing. */
 99         msleep(100);
100 
101         return 0;
102 }
103 
104 static void stop_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream)
105 {
106         amdtp_stream_pcm_abort(stream);
107         amdtp_stream_stop(stream);
108 
109         if (stream == &oxfw->tx_stream)
110                 cmp_connection_break(&oxfw->out_conn);
111         else
112                 cmp_connection_break(&oxfw->in_conn);
113 }
114 
115 static int start_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream,
116                         unsigned int rate, unsigned int pcm_channels)
117 {
118         u8 **formats;
119         struct cmp_connection *conn;
120         struct snd_oxfw_stream_formation formation;
121         unsigned int i, midi_ports;
122         int err;
123 
124         if (stream == &oxfw->rx_stream) {
125                 formats = oxfw->rx_stream_formats;
126                 conn = &oxfw->in_conn;
127         } else {
128                 formats = oxfw->tx_stream_formats;
129                 conn = &oxfw->out_conn;
130         }
131 
132         /* Get stream format */
133         for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
134                 if (formats[i] == NULL)
135                         break;
136 
137                 err = snd_oxfw_stream_parse_format(formats[i], &formation);
138                 if (err < 0)
139                         goto end;
140                 if (rate != formation.rate)
141                         continue;
142                 if (pcm_channels == 0 ||  pcm_channels == formation.pcm)
143                         break;
144         }
145         if (i == SND_OXFW_STREAM_FORMAT_ENTRIES) {
146                 err = -EINVAL;
147                 goto end;
148         }
149 
150         pcm_channels = formation.pcm;
151         midi_ports = formation.midi * 8;
152 
153         /* The stream should have one pcm channels at least */
154         if (pcm_channels == 0) {
155                 err = -EINVAL;
156                 goto end;
157         }
158         err = amdtp_am824_set_parameters(stream, rate, pcm_channels, midi_ports,
159                                          false);
160         if (err < 0)
161                 goto end;
162 
163         err = cmp_connection_establish(conn,
164                                        amdtp_stream_get_max_payload(stream));
165         if (err < 0)
166                 goto end;
167 
168         err = amdtp_stream_start(stream,
169                                  conn->resources.channel,
170                                  conn->speed);
171         if (err < 0) {
172                 cmp_connection_break(conn);
173                 goto end;
174         }
175 
176         /* Wait first packet */
177         if (!amdtp_stream_wait_callback(stream, CALLBACK_TIMEOUT)) {
178                 stop_stream(oxfw, stream);
179                 err = -ETIMEDOUT;
180         }
181 end:
182         return err;
183 }
184 
185 static int check_connection_used_by_others(struct snd_oxfw *oxfw,
186                                            struct amdtp_stream *stream)
187 {
188         struct cmp_connection *conn;
189         bool used;
190         int err;
191 
192         if (stream == &oxfw->tx_stream)
193                 conn = &oxfw->out_conn;
194         else
195                 conn = &oxfw->in_conn;
196 
197         err = cmp_connection_check_used(conn, &used);
198         if ((err >= 0) && used && !amdtp_stream_running(stream)) {
199                 dev_err(&oxfw->unit->device,
200                         "Connection established by others: %cPCR[%d]\n",
201                         (conn->direction == CMP_OUTPUT) ? 'o' : 'i',
202                         conn->pcr_index);
203                 err = -EBUSY;
204         }
205 
206         return err;
207 }
208 
209 int snd_oxfw_stream_init_simplex(struct snd_oxfw *oxfw,
210                                  struct amdtp_stream *stream)
211 {
212         struct cmp_connection *conn;
213         enum cmp_direction c_dir;
214         enum amdtp_stream_direction s_dir;
215         int err;
216 
217         if (stream == &oxfw->tx_stream) {
218                 conn = &oxfw->out_conn;
219                 c_dir = CMP_OUTPUT;
220                 s_dir = AMDTP_IN_STREAM;
221         } else {
222                 conn = &oxfw->in_conn;
223                 c_dir = CMP_INPUT;
224                 s_dir = AMDTP_OUT_STREAM;
225         }
226 
227         err = cmp_connection_init(conn, oxfw->unit, c_dir, 0);
228         if (err < 0)
229                 goto end;
230 
231         err = amdtp_am824_init(stream, oxfw->unit, s_dir, CIP_NONBLOCKING);
232         if (err < 0) {
233                 amdtp_stream_destroy(stream);
234                 cmp_connection_destroy(conn);
235                 goto end;
236         }
237 
238         /*
239          * OXFW starts to transmit packets with non-zero dbc.
240          * OXFW postpone transferring packets till handling any asynchronous
241          * packets. As a result, next isochronous packet includes more data
242          * blocks than IEC 61883-6 defines.
243          */
244         if (stream == &oxfw->tx_stream) {
245                 oxfw->tx_stream.flags |= CIP_JUMBO_PAYLOAD;
246                 if (oxfw->wrong_dbs)
247                         oxfw->tx_stream.flags |= CIP_WRONG_DBS;
248         }
249 end:
250         return err;
251 }
252 
253 int snd_oxfw_stream_start_simplex(struct snd_oxfw *oxfw,
254                                   struct amdtp_stream *stream,
255                                   unsigned int rate, unsigned int pcm_channels)
256 {
257         struct amdtp_stream *opposite;
258         struct snd_oxfw_stream_formation formation;
259         enum avc_general_plug_dir dir;
260         unsigned int substreams, opposite_substreams;
261         int err = 0;
262 
263         if (stream == &oxfw->tx_stream) {
264                 substreams = oxfw->capture_substreams;
265                 opposite = &oxfw->rx_stream;
266                 opposite_substreams = oxfw->playback_substreams;
267                 dir = AVC_GENERAL_PLUG_DIR_OUT;
268         } else {
269                 substreams = oxfw->playback_substreams;
270                 opposite_substreams = oxfw->capture_substreams;
271 
272                 if (oxfw->has_output)
273                         opposite = &oxfw->rx_stream;
274                 else
275                         opposite = NULL;
276 
277                 dir = AVC_GENERAL_PLUG_DIR_IN;
278         }
279 
280         if (substreams == 0)
281                 goto end;
282 
283         /*
284          * Considering JACK/FFADO streaming:
285          * TODO: This can be removed hwdep functionality becomes popular.
286          */
287         err = check_connection_used_by_others(oxfw, stream);
288         if (err < 0)
289                 goto end;
290 
291         /* packet queueing error */
292         if (amdtp_streaming_error(stream))
293                 stop_stream(oxfw, stream);
294 
295         err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
296         if (err < 0)
297                 goto end;
298         if (rate == 0)
299                 rate = formation.rate;
300         if (pcm_channels == 0)
301                 pcm_channels = formation.pcm;
302 
303         if ((formation.rate != rate) || (formation.pcm != pcm_channels)) {
304                 if (opposite != NULL) {
305                         err = check_connection_used_by_others(oxfw, opposite);
306                         if (err < 0)
307                                 goto end;
308                         stop_stream(oxfw, opposite);
309                 }
310                 stop_stream(oxfw, stream);
311 
312                 err = set_stream_format(oxfw, stream, rate, pcm_channels);
313                 if (err < 0) {
314                         dev_err(&oxfw->unit->device,
315                                 "fail to set stream format: %d\n", err);
316                         goto end;
317                 }
318 
319                 /* Start opposite stream if needed. */
320                 if (opposite && !amdtp_stream_running(opposite) &&
321                     (opposite_substreams > 0)) {
322                         err = start_stream(oxfw, opposite, rate, 0);
323                         if (err < 0) {
324                                 dev_err(&oxfw->unit->device,
325                                         "fail to restart stream: %d\n", err);
326                                 goto end;
327                         }
328                 }
329         }
330 
331         /* Start requested stream. */
332         if (!amdtp_stream_running(stream)) {
333                 err = start_stream(oxfw, stream, rate, pcm_channels);
334                 if (err < 0)
335                         dev_err(&oxfw->unit->device,
336                                 "fail to start stream: %d\n", err);
337         }
338 end:
339         return err;
340 }
341 
342 void snd_oxfw_stream_stop_simplex(struct snd_oxfw *oxfw,
343                                   struct amdtp_stream *stream)
344 {
345         if (((stream == &oxfw->tx_stream) && (oxfw->capture_substreams > 0)) ||
346             ((stream == &oxfw->rx_stream) && (oxfw->playback_substreams > 0)))
347                 return;
348 
349         stop_stream(oxfw, stream);
350 }
351 
352 /*
353  * This function should be called before starting the stream or after stopping
354  * the streams.
355  */
356 void snd_oxfw_stream_destroy_simplex(struct snd_oxfw *oxfw,
357                                      struct amdtp_stream *stream)
358 {
359         struct cmp_connection *conn;
360 
361         if (stream == &oxfw->tx_stream)
362                 conn = &oxfw->out_conn;
363         else
364                 conn = &oxfw->in_conn;
365 
366         amdtp_stream_destroy(stream);
367         cmp_connection_destroy(conn);
368 }
369 
370 void snd_oxfw_stream_update_simplex(struct snd_oxfw *oxfw,
371                                     struct amdtp_stream *stream)
372 {
373         struct cmp_connection *conn;
374 
375         if (stream == &oxfw->tx_stream)
376                 conn = &oxfw->out_conn;
377         else
378                 conn = &oxfw->in_conn;
379 
380         if (cmp_connection_update(conn) < 0)
381                 stop_stream(oxfw, stream);
382         else
383                 amdtp_stream_update(stream);
384 }
385 
386 int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw,
387                                 enum avc_general_plug_dir dir,
388                                 struct snd_oxfw_stream_formation *formation)
389 {
390         u8 *format;
391         unsigned int len;
392         int err;
393 
394         len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
395         format = kmalloc(len, GFP_KERNEL);
396         if (format == NULL)
397                 return -ENOMEM;
398 
399         err = avc_stream_get_format_single(oxfw->unit, dir, 0, format, &len);
400         if (err < 0)
401                 goto end;
402         if (len < 3) {
403                 err = -EIO;
404                 goto end;
405         }
406 
407         err = snd_oxfw_stream_parse_format(format, formation);
408 end:
409         kfree(format);
410         return err;
411 }
412 
413 /*
414  * See Table 6.16 - AM824 Stream Format
415  *     Figure 6.19 - format_information field for AM824 Compound
416  * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA)
417  * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
418  */
419 int snd_oxfw_stream_parse_format(u8 *format,
420                                  struct snd_oxfw_stream_formation *formation)
421 {
422         unsigned int i, e, channels, type;
423 
424         memset(formation, 0, sizeof(struct snd_oxfw_stream_formation));
425 
426         /*
427          * this module can support a hierarchy combination that:
428          *  Root:       Audio and Music (0x90)
429          *  Level 1:    AM824 Compound  (0x40)
430          */
431         if ((format[0] != 0x90) || (format[1] != 0x40))
432                 return -ENOSYS;
433 
434         /* check the sampling rate */
435         for (i = 0; i < ARRAY_SIZE(avc_stream_rate_table); i++) {
436                 if (format[2] == avc_stream_rate_table[i])
437                         break;
438         }
439         if (i == ARRAY_SIZE(avc_stream_rate_table))
440                 return -ENOSYS;
441 
442         formation->rate = oxfw_rate_table[i];
443 
444         for (e = 0; e < format[4]; e++) {
445                 channels = format[5 + e * 2];
446                 type = format[6 + e * 2];
447 
448                 switch (type) {
449                 /* IEC 60958 Conformant, currently handled as MBLA */
450                 case 0x00:
451                 /* Multi Bit Linear Audio (Raw) */
452                 case 0x06:
453                         formation->pcm += channels;
454                         break;
455                 /* MIDI Conformant */
456                 case 0x0d:
457                         formation->midi = channels;
458                         break;
459                 /* IEC 61937-3 to 7 */
460                 case 0x01:
461                 case 0x02:
462                 case 0x03:
463                 case 0x04:
464                 case 0x05:
465                 /* Multi Bit Linear Audio */
466                 case 0x07:      /* DVD-Audio */
467                 case 0x0c:      /* High Precision */
468                 /* One Bit Audio */
469                 case 0x08:      /* (Plain) Raw */
470                 case 0x09:      /* (Plain) SACD */
471                 case 0x0a:      /* (Encoded) Raw */
472                 case 0x0b:      /* (Encoded) SACD */
473                 /* SMPTE Time-Code conformant */
474                 case 0x0e:
475                 /* Sample Count */
476                 case 0x0f:
477                 /* Anciliary Data */
478                 case 0x10:
479                 /* Synchronization Stream (Stereo Raw audio) */
480                 case 0x40:
481                 /* Don't care */
482                 case 0xff:
483                 default:
484                         return -ENOSYS; /* not supported */
485                 }
486         }
487 
488         if (formation->pcm  > AM824_MAX_CHANNELS_FOR_PCM ||
489             formation->midi > AM824_MAX_CHANNELS_FOR_MIDI)
490                 return -ENOSYS;
491 
492         return 0;
493 }
494 
495 static int
496 assume_stream_formats(struct snd_oxfw *oxfw, enum avc_general_plug_dir dir,
497                       unsigned int pid, u8 *buf, unsigned int *len,
498                       u8 **formats)
499 {
500         struct snd_oxfw_stream_formation formation;
501         unsigned int i, eid;
502         int err;
503 
504         /* get format at current sampling rate */
505         err = avc_stream_get_format_single(oxfw->unit, dir, pid, buf, len);
506         if (err < 0) {
507                 dev_err(&oxfw->unit->device,
508                 "fail to get current stream format for isoc %s plug %d:%d\n",
509                         (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out",
510                         pid, err);
511                 goto end;
512         }
513 
514         /* parse and set stream format */
515         eid = 0;
516         err = snd_oxfw_stream_parse_format(buf, &formation);
517         if (err < 0)
518                 goto end;
519 
520         formats[eid] = kmemdup(buf, *len, GFP_KERNEL);
521         if (formats[eid] == NULL) {
522                 err = -ENOMEM;
523                 goto end;
524         }
525 
526         /* apply the format for each available sampling rate */
527         for (i = 0; i < ARRAY_SIZE(oxfw_rate_table); i++) {
528                 if (formation.rate == oxfw_rate_table[i])
529                         continue;
530 
531                 err = avc_general_inquiry_sig_fmt(oxfw->unit,
532                                                   oxfw_rate_table[i],
533                                                   dir, pid);
534                 if (err < 0)
535                         continue;
536 
537                 eid++;
538                 formats[eid] = kmemdup(buf, *len, GFP_KERNEL);
539                 if (formats[eid] == NULL) {
540                         err = -ENOMEM;
541                         goto end;
542                 }
543                 formats[eid][2] = avc_stream_rate_table[i];
544         }
545 
546         err = 0;
547         oxfw->assumed = true;
548 end:
549         return err;
550 }
551 
552 static int fill_stream_formats(struct snd_oxfw *oxfw,
553                                enum avc_general_plug_dir dir,
554                                unsigned short pid)
555 {
556         u8 *buf, **formats;
557         unsigned int len, eid = 0;
558         struct snd_oxfw_stream_formation dummy;
559         int err;
560 
561         buf = kmalloc(AVC_GENERIC_FRAME_MAXIMUM_BYTES, GFP_KERNEL);
562         if (buf == NULL)
563                 return -ENOMEM;
564 
565         if (dir == AVC_GENERAL_PLUG_DIR_OUT)
566                 formats = oxfw->tx_stream_formats;
567         else
568                 formats = oxfw->rx_stream_formats;
569 
570         /* get first entry */
571         len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
572         err = avc_stream_get_format_list(oxfw->unit, dir, 0, buf, &len, 0);
573         if (err == -ENOSYS) {
574                 /* LIST subfunction is not implemented */
575                 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
576                 err = assume_stream_formats(oxfw, dir, pid, buf, &len,
577                                             formats);
578                 goto end;
579         } else if (err < 0) {
580                 dev_err(&oxfw->unit->device,
581                         "fail to get stream format %d for isoc %s plug %d:%d\n",
582                         eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" : "out",
583                         pid, err);
584                 goto end;
585         }
586 
587         /* LIST subfunction is implemented */
588         while (eid < SND_OXFW_STREAM_FORMAT_ENTRIES) {
589                 /* The format is too short. */
590                 if (len < 3) {
591                         err = -EIO;
592                         break;
593                 }
594 
595                 /* parse and set stream format */
596                 err = snd_oxfw_stream_parse_format(buf, &dummy);
597                 if (err < 0)
598                         break;
599 
600                 formats[eid] = kmemdup(buf, len, GFP_KERNEL);
601                 if (formats[eid] == NULL) {
602                         err = -ENOMEM;
603                         break;
604                 }
605 
606                 /* get next entry */
607                 len = AVC_GENERIC_FRAME_MAXIMUM_BYTES;
608                 err = avc_stream_get_format_list(oxfw->unit, dir, 0,
609                                                  buf, &len, ++eid);
610                 /* No entries remained. */
611                 if (err == -EINVAL) {
612                         err = 0;
613                         break;
614                 } else if (err < 0) {
615                         dev_err(&oxfw->unit->device,
616                         "fail to get stream format %d for isoc %s plug %d:%d\n",
617                                 eid, (dir == AVC_GENERAL_PLUG_DIR_IN) ? "in" :
618                                                                         "out",
619                                 pid, err);
620                         break;
621                 }
622         }
623 end:
624         kfree(buf);
625         return err;
626 }
627 
628 int snd_oxfw_stream_discover(struct snd_oxfw *oxfw)
629 {
630         u8 plugs[AVC_PLUG_INFO_BUF_BYTES];
631         struct snd_oxfw_stream_formation formation;
632         u8 *format;
633         unsigned int i;
634         int err;
635 
636         /* the number of plugs for isoc in/out, ext in/out  */
637         err = avc_general_get_plug_info(oxfw->unit, 0x1f, 0x07, 0x00, plugs);
638         if (err < 0) {
639                 dev_err(&oxfw->unit->device,
640                 "fail to get info for isoc/external in/out plugs: %d\n",
641                         err);
642                 goto end;
643         } else if ((plugs[0] == 0) && (plugs[1] == 0)) {
644                 err = -ENOSYS;
645                 goto end;
646         }
647 
648         /* use oPCR[0] if exists */
649         if (plugs[1] > 0) {
650                 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_OUT, 0);
651                 if (err < 0)
652                         goto end;
653 
654                 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
655                         format = oxfw->tx_stream_formats[i];
656                         if (format == NULL)
657                                 continue;
658                         err = snd_oxfw_stream_parse_format(format, &formation);
659                         if (err < 0)
660                                 continue;
661 
662                         /* Add one MIDI port. */
663                         if (formation.midi > 0)
664                                 oxfw->midi_input_ports = 1;
665                 }
666 
667                 oxfw->has_output = true;
668         }
669 
670         /* use iPCR[0] if exists */
671         if (plugs[0] > 0) {
672                 err = fill_stream_formats(oxfw, AVC_GENERAL_PLUG_DIR_IN, 0);
673                 if (err < 0)
674                         goto end;
675 
676                 for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
677                         format = oxfw->rx_stream_formats[i];
678                         if (format == NULL)
679                                 continue;
680                         err = snd_oxfw_stream_parse_format(format, &formation);
681                         if (err < 0)
682                                 continue;
683 
684                         /* Add one MIDI port. */
685                         if (formation.midi > 0)
686                                 oxfw->midi_output_ports = 1;
687                 }
688         }
689 end:
690         return err;
691 }
692 
693 void snd_oxfw_stream_lock_changed(struct snd_oxfw *oxfw)
694 {
695         oxfw->dev_lock_changed = true;
696         wake_up(&oxfw->hwdep_wait);
697 }
698 
699 int snd_oxfw_stream_lock_try(struct snd_oxfw *oxfw)
700 {
701         int err;
702 
703         spin_lock_irq(&oxfw->lock);
704 
705         /* user land lock this */
706         if (oxfw->dev_lock_count < 0) {
707                 err = -EBUSY;
708                 goto end;
709         }
710 
711         /* this is the first time */
712         if (oxfw->dev_lock_count++ == 0)
713                 snd_oxfw_stream_lock_changed(oxfw);
714         err = 0;
715 end:
716         spin_unlock_irq(&oxfw->lock);
717         return err;
718 }
719 
720 void snd_oxfw_stream_lock_release(struct snd_oxfw *oxfw)
721 {
722         spin_lock_irq(&oxfw->lock);
723 
724         if (WARN_ON(oxfw->dev_lock_count <= 0))
725                 goto end;
726         if (--oxfw->dev_lock_count == 0)
727                 snd_oxfw_stream_lock_changed(oxfw);
728 end:
729         spin_unlock_irq(&oxfw->lock);
730 }
731 

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