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6 .TH IEC61883 7I "Mar 27, 2009"
7 .SH NAME
8 iec61883 \- IEC 61883 interfaces
9 .SH SYNOPSIS
10 .LP
11 .nf
12 #include <sys/av/iec61883.h>
13 .fi
14
15 .SH DESCRIPTION
16 .sp
17 .LP
18 The set of interfaces described in this man page can be used to control and
19 exchange data with consumer audio/video devices using protocols specified
20 in\fIIEC 61883 Consumer Electronic Audio/Video Equipment - Digital
21 Interface\fR, including Common Isochronous Packet (CIP), Connection Management
22 Procedures (CMP) and Function Control Protocol (FCP).
23 .sp
24 .LP
25 An \fBiec61883\fR compliant driver exports two device nodes for isochronous and
26 for asynchronous transactions. See the \fBFILES\fR section of this man page for
27 the namespace definition.
28 .SS "Isochronous Transfers"
29 .sp
30 .LP
31 Two methods are provided to receive/transmit isochronous data: using
32 \fBmmap\fR(2) in combination with \fBioctl\fR(2), and \fBread\fR(2) or
33 \fBwrite\fR(2).
34 .SS "Mmap/Ioctl"
35 .sp
36 .LP
37 This method provides better performance and finer-grained control than
38 read/write, and is a method of choice for most applications. The data buffer is
39 mapped into a user process address space, which means no data copying between
40 the kernel and an application is necessary. Synchronization between user
41 processes and the driver is performed using \fBioctl\fR(2) commands.
42 .sp
43 .LP
44 An application allocates resources for isochronous transfer using
45 \fBIEC61883_ISOCH_INIT\fR. Then the data buffer can be mapped into the process
46 space using \fBmmap\fR(2).
47 .sp
48 .LP
49 A circular data buffer consists of one or more equal size frame buffers
50 (further referred to as frames, unless to avoid ambiguity with AV frames).
51 Frames are numbered starting with zero and are always transferred sequentially.
52 Frames consist equal sized packets. Each packet contains a CIP header and one
53 or more data blocks.
54 .sp
55 .LP
56 A driver and an application act as a producer and a consumer: producer supplies
57 \fBfull\fR frames (filled with data) to the consumer, and the producer is not
58 allowed to access those frames until the consumer claims them \fBempty\fR.
59 .sp
60 .LP
61 A transfer can be initiated and suspended with \fBIEC61883_START\fR and
62 \fBIEC61883_STOP\fR commands respectively. \fBIEC61883_RECV\fR or
63 \fBIEC61883_XMIT\fR is used for producer-consumer synchronization.
64 .SS "Read/Write"
65 .sp
66 .LP
67 Using this method, an application calls \fBread\fR(2) or \fBwrite\fR(2) to
68 receive or transmit a specified amount of data. Bus-specific overhead, such as
69 isochronous packet headers, is handled by the driver and is not exposed to
70 applications. Data returned by \fBread\fR(2) contains CIP headers and data
71 blocks. Empty packets are not returned by \fBread\fR(2). \fBwrite\fR(2) data
72 should meet the same requirements.
73 .sp
74 .LP
75 If one or more channels have been allocated since \fBopen\fR(2) (see
76 \fBIEC61883_ISOCH_INIT\fR), the data is received/transmitted using channel that
77 was created the last.
78 .sp
79 .LP
80 If no channels were allocated, the driver uses the broadcast channel by default
81 and allocates the default-size data buffer. During transmit, the first packet's
82 CIP header is used to auto-detect the data format. If it is one of the formats
83 supported by the driver, it is properly transmitted (with inserted empty
84 packets and timestamps).
85 .sp
86 .LP
87 For both methods, if during transmit the driver runs out of data, it transmits
88 empty packets containing only a CIP header of the next to be transmitted
89 packet, as defined in \fIIEC 61883-1\fR.
90 .SS "Connection Management Procedures"
91 .sp
92 .LP
93 Applications wishing to follow Connection Management Procedures (CMP) in
94 combination with isochronous transfers should use the \fBioctl\fR(2)
95 \fBIEC61883_PLUG_INIT, IEC61883_PLUG_FINI, IEC61883_PLUG_REG_READ\fR and
96 \fBIEC61883_PLUG_REG_CAS\fR commands.
97 .SS "Asynchronous Transactions"
98 .sp
99 .LP
100 \fBread\fR(2), \fBwrite\fR(2), \fBioctl\fR(2), and \fBpoll\fR(2) can be used
101 with asynchronous nodes. Asynchronous data exchange between a driver and an
102 application utilizes a common data structure called asynchronous request (ARQ):
103 .sp
104 .in +2
105 .nf
106 typedef struct iec61883_arq {
107 int arq_type;
108 int arq_len;
109 union {
110 uint32_t quadlet;
111 uint64_t octlet;
112 uint8_t buf[8];
113 } arq_data;
114 } iec61883_arq_t;
115 .fi
116 .in -2
117 .sp
118
119 .sp
120 .LP
121 \fBarq_type\fR contains \fBARQ\fR type:
122 .sp
123 .ne 2
124 .na
125 \fB\fBIEC61883_ARQ_FCP_CMD\fR\fR
126 .ad
127 .br
128 .na
129 \fB\fBIEC61883_ARQ_FCP_RESP\fR\fR
130 .ad
131 .sp .6
132 .RS 4n
133 \fBFCP\fR command and response frame respectively. Outgoing frames are sent
134 using \fBwrite\fR(2), incoming frames are received with \fBread\fR(2).
135 .sp
136 See \fIIEC 61883-1\fR for the FCP frame structure definition.
137 .RE
138
139 .sp
140 .ne 2
141 .na
142 \fB\fBIEC61883_ARQ_BUS_RESET\fR\fR
143 .ad
144 .sp .6
145 .RS 4n
146 Returned by the driver when a bus reset occurs. There is no data associated
147 with this request type, and \fBarq_len\fR is set to 0.
148 .RE
149
150 .sp
151 .LP
152 If \fBarq_len\fR is 4 or 8, then data should be supplied in
153 \fBarq_data.quadlet\fR or \fBarq_data.octlet\fR respectively, otherwise up to 8
154 bytes can be put in \fBarq_data.buf\fR, with the rest of the data following
155 immediately after.
156 .SS "write(2)"
157 .sp
158 .LP
159 For a request to be sent to a target, an \fBiec61883_arq_t\fR structure along
160 with associated data is passed to the driver using \fBwrite\fR(2).
161 \fBwrite()\fR blocks until the request is completed.
162 .SS "read(2)"
163 .sp
164 .LP
165 A driver collects incoming ARQs in the internal buffer. Buffer size can be
166 changed using the \fBioctl\fR(2) command \fBIEC61883_FCP_SET_IBUF_SIZE\fR.
167 .sp
168 .LP
169 Reading an ARQ takes one or two steps depending on data length. An application
170 first reads \fBsizeof (iec61883_arq_t)\fR bytes: if \fBarq_len\fR is less than
171 or equal 4, which is usually the case, no additional step is needed. Otherwise,
172 the remaining \fBarq_len - 4\fR bytes should be read and concatenated.
173 .sp
174 .LP
175 \fBread\fR(2) blocks until the specified amount of data is available, unless
176 \fBO_NONBLOCK\fR or \fBO_NDELAY\fR flag was set during \fBopen\fR(2), in which
177 case \fBread\fR(2) returns immediately.
178 .SS "poll(2)"
179 .sp
180 .LP
181 Applications can \fBpoll\fR(2) asynchronous nodes on the \fBPOLLIN\fR event.
182 .SS "Bus Reset"
183 .sp
184 .LP
185 In case of a bus reset, the driver notifies an application by generating an
186 \fBARQ\fR of type \fBIEC61883_ARQ_BUS_RESET\fR.
187 .sp
188 .LP
189 If there were established isochronous connections before bus reset, the driver
190 attempts to restore all connections as described in \fIIEC 61883\fR and resume
191 any active transfers that were in progress.
192 .SH IOCTLS
193 .sp
194 .LP
195 The following commands only apply to isochronous nodes:
196 .sp
197 .ne 2
198 .na
199 \fB\fBIEC61883_ISOCH_INIT\fR\fR
200 .ad
201 .sp .6
202 .RS 4n
203 This command allocates a data buffer and isochronous resources (if necessary)
204 for the isochronous transfer. The argument is a pointer to the structure:
205 .sp
206 .in +2
207 .nf
208 typedef struct iec61883_isoch_init {
209 int ii_version; /* interface version */
210 int ii_pkt_size; /* packet size */
211 int ii_frame_size; /* packets/frame */
212 int ii_frame_cnt; /* # of frames */
213 int ii_direction; /* xfer direction */
214 int ii_bus_speed; /* bus speed */
215 uint64_t ii_channel; /* channel mask */
216 int ii_dbs; /* DBS */
217 int ii_fn; /* FN */
218 int ii_rate_n; /* rate numerator */
219 int ii_rate_d; /* rate denominator */
220 int ii_ts_mode; /* timestamp mode */
221 int ii_flags; /* flags */
222 int ii_handle; /* isoch handle */
223 int ii_frame_rcnt; /* # of frames */
224 off_t *ii_mmap_off /* mmap offset */
225 int ii_rchannel; /* channel */
226 int ii_error; /* error code */
227 } iec61883_isoch_init_t;
228 .fi
229 .in -2
230 .sp
231
232 \fBii_version\fR should be set to \fBIEC61883_V1_0\fR.
233 .sp
234 The driver attempts to allocate a data buffer consisting of \fBii_frame_cnt\fR
235 frames, with \fBii_frame_size\fR packets in each frame. Packet size in bytes is
236 specified by \fBii_pkt_size\fR specifies and should be a multiple of 512 and
237 compatible with \fBii_bus_speed\fR.
238 .sp
239 \fBii_direction\fR can take one of the following values:
240 .sp
241 .ne 2
242 .na
243 \fB\fBIEC61883_DIR_RECV\fR\fR
244 .ad
245 .sp .6
246 .RS 4n
247 Receiving isochronous data.
248 .RE
249
250 .sp
251 .ne 2
252 .na
253 \fB\fBIEC61883_DIR_XMIT\fR\fR
254 .ad
255 .sp .6
256 .RS 4n
257 Transmitting isochronous data.
258 .RE
259
260 \fBii_bus_speed\fR chooses bus speed to be used and can be either
261 \fBIEC61883_S100, IEC61883_S200\fR or \fBIEC61883_S400\fR.
262 .sp
263 \fBii_channel\fR is a mask that specifies an isochronous channel number to be
264 used, with the \fIN\fRth bit representing channel \fIN\fR. When transmitting
265 data, several bits can be set at a time, in which case the driver chooses one,
266 for example, \fB0x3FF\fR means a range from 0 to 9. In case of receive, only
267 one bit can be set.
268 .sp
269 \fBii_dbs\fR specifies data block size in quadlets, for example, DBS value for
270 \fBSD-DVCR\fR is \fB0x78\fR. Refer to \fIIEC 61883\fR for more details on DBS.
271 .sp
272 ii_fn specifies fraction number, which defines the number of blocks in which a
273 source packet is divided. Allowed values are from 0 to 3. Refer to IEC 61883
274 for more details on FN.
275 .sp
276 Data rate expected by the AV device can be lower than the bus speed, in which
277 case the driver has to periodically insert empty packets into the data stream
278 to avoid device buffer overflows. This rate is specified with a fraction N/D,
279 set by \fBii_rate_n\fR and \fBii_rate_d\fR respectively. Any integer numbers
280 can be used, or the following predefined constants:
281 .sp
282 .ne 2
283 .na
284 \fB\fBIEC61883_RATE_N_DV_NTSC IEC61883_RATE_D_DV_NTSC\fR\fR
285 .ad
286 .sp .6
287 .RS 4n
288 Data rate expected by \fBDV-NTSC\fR devices.
289 .RE
290
291 .sp
292 .ne 2
293 .na
294 \fB\fBIEC61883_RATE_N_DV_PAL IEC61883_RATE_D_DV_PAL\fR\fR
295 .ad
296 .sp .6
297 .RS 4n
298 Data rate expected by \fBDV-PAL\fR devices.
299 .RE
300
301 During data transmission, a timestamp based on the current value of the cycle
302 timer is usually required. \fBii_ts_mode\fR defines timestamp mode to be used:
303 .sp
304 .ne 2
305 .na
306 \fB\fBIEC61883_TS_SYT\fR\fR
307 .ad
308 .sp .6
309 .RS 4n
310 Driver puts a timestamp in the SYT field of the first CIP header of each frame.
311 .RE
312
313 .sp
314 .ne 2
315 .na
316 \fB\fBIEC61883_TS_NONE\fR\fR
317 .ad
318 .sp .6
319 .RS 4n
320 No timestamps.
321 .RE
322
323 \fBii_dbs, ii_fn, ii_rate_n, ii_rate_d\fR and \fBii_ts_mode\fR are only
324 required for transmission. In other case these should be set to 0.
325 .sp
326 \fBii_flags\fR should be set to 0.
327 .sp
328 If command succeeds, \fBii_handle\fR contains a handle that should be used with
329 other isochronous commands. \fBii_frame_rcnt\fR contains the number of
330 allocated frames (can be less than \fBii_frame_cnt\fR). \fBii_mmap_off\fR
331 contains an offset to be used in \fBmmap\fR(2), for example, to map an entire
332 data receive buffer:
333 .sp
334 .in +2
335 .nf
336 pa = mmap(NULL, init.ii_pkt_size *
337 init.ii_frame_size * init.ii_frame_rcnt,
338 PROT_READ, MAP_PRIVATE, fd, init.ii_mmap_off);
339 .fi
340 .in -2
341 .sp
342
343 \fBii_rchannel\fR contains channel number.
344 .sp
345 In case of command success, \fBii_error\fR is set to 0; otherwise one of the
346 following values can be returned:
347 .sp
348 .ne 2
349 .na
350 \fB\fBIEC61883_ERR_NOMEM\fR\fR
351 .ad
352 .sp .6
353 .RS 4n
354 Not enough memory for the data buffer.
355 .RE
356
357 .sp
358 .ne 2
359 .na
360 \fB\fBIEC61883_ERR_NOCHANNEL\fR\fR
361 .ad
362 .sp .6
363 .RS 4n
364 Cannot allocate isochronous channel.
365 .RE
366
367 .sp
368 .ne 2
369 .na
370 \fB\fBIEC61883_ERR_PKT_SIZE\fR\fR
371 .ad
372 .sp .6
373 .RS 4n
374 Packet size is not allowed at this bus speed.
375 .RE
376
377 .sp
378 .ne 2
379 .na
380 \fB\fBIEC61883_ERR_VERSION\fR\fR
381 .ad
382 .sp .6
383 .RS 4n
384 Interface version is not supported.
385 .RE
386
387 .sp
388 .ne 2
389 .na
390 \fB\fBIEC61883_ERR_INVAL\fR\fR
391 .ad
392 .sp .6
393 .RS 4n
394 One or more the parameters are invalid
395 .RE
396
397 .sp
398 .ne 2
399 .na
400 \fB\fBIEC61883_ERR_OTHER\fR\fR
401 .ad
402 .sp .6
403 .RS 4n
404 Unspecified error type.
405 .RE
406
407 .RE
408
409 .sp
410 .ne 2
411 .na
412 \fB\fBIEC61883_ISOCH_FINI\fR\fR
413 .ad
414 .sp .6
415 .RS 4n
416 Argument is a handle returned by \fBIEC61883_ISOCH_INIT\fR. This command frees
417 any resources associated with this handle. There must be no active transfers
418 and the data buffer must be unmapped; otherwise the command fails.
419 .RE
420
421 .sp
422 .ne 2
423 .na
424 \fB\fBIEC61883_START\fR\fR
425 .ad
426 .sp .6
427 .RS 4n
428 This command starts an isochronous transfer. The argument is a handle returned
429 by \fBIEC61883_ISOCH_INIT\fR.
430 .RE
431
432 .sp
433 .ne 2
434 .na
435 \fB\fBIEC61883_STOP\fR\fR
436 .ad
437 .sp .6
438 .RS 4n
439 This command stops an isochronous transfer. The argument is a handle returned
440 by \fBIEC61883_ISOCH_INIT\fR.
441 .RE
442
443 .sp
444 .ne 2
445 .na
446 \fB\fBIEC61883_RECV\fR\fR
447 .ad
448 .sp .6
449 .RS 4n
450 This command is used to receive full frames and return empty frames to the
451 driver. The argument is a pointer to the structure:
452 .sp
453 .in +2
454 .nf
455 typedef struct iec61883_recv {
456 int rx_handle; /* isoch handle */
457 int rx_flags; /* flags */
458 iec61883_xfer_t rx_xfer; /* xfer params */
459 } iec61883_recv_t;
460
461 typedef struct iec61883_xfer {
462 int xf_empty_idx; /* first empty frame */
463 int xf_empty_cnt; /* empty frame count */
464 int xf_full_idx; /* first full frame */
465 int xf_full_cnt; /* full frame count */
466 int xf_error; /* error */
467 } iec61883_xfer_t;
468 .fi
469 .in -2
470 .sp
471
472 \fBrx_flags\fR should be set to 0.
473 .sp
474 An application sets \fBxf_empty_idx\fR and \fBxf_empty_cnt\fR to indicate
475 frames it no longer needs. E.g. if a buffer consists of 6 frames,
476 \fBxf_empty_idx\fR is 4, \fBxf_empty_cnt\fR is 3 - means that frames 4, 5 and 0
477 can now be reused by the driver. If there are no empty frames, for example, the
478 first time this command is called, \fBxf_empty_cnt\fR should be set to 0.
479 .sp
480 When the command returns, \fBxf_full_idx\fR and \fBxf_full_cnt\fR specifies the
481 frames that are full. \fBxf_error\fR is always 0.
482 .sp
483 In general, AV frame boundaries are not aligned with the frame buffer
484 boundaries, because the first received packet might not be the first packet of
485 an AV frame, and, in contrast with the read/write method, the driver does not
486 remove empty CIP packets.
487 .sp
488 Applications should detect empty packets by comparing adjacent packets'
489 continuity counters (DBC field of the CIP header).
490 .RE
491
492 .sp
493 .ne 2
494 .na
495 \fB\fBIEC61883_XMIT\fR\fR
496 .ad
497 .sp .6
498 .RS 4n
499 This command is used to transmit full frames and get more empty frames from the
500 driver. The argument is a pointer to the structure:
501 .sp
502 .in +2
503 .nf
504 typedef struct iec61883_xmit {
505 int tx_handle; /* isoch handle */
506 int tx_flags; /* flags */
507 iec61883_xfer_t tx_xfer; /* xfer params */
508 int tx_miss_cnt; /* missed cycles */
509 } iec61883_xmit_t;
510 .fi
511 .in -2
512 .sp
513
514 \fBtx_flags\fR should be set to zero.
515 .sp
516 The application sets \fBxf_full_idx\fR and \fBxf_full_cnt\fR to specify frames
517 it wishes to transmit. If there are no frames to transmit (e.g. the first time
518 this command is called), \fBxf_full_cnt\fR should be set to 0.
519 .sp
520 When the command returns, \fBxf_empty_idx\fR and \fBxf_empty_cnt\fR specifies
521 empty frames which can be to transmit more data. \fBxf_error\fR is always 0.
522 .sp
523 \fBtx_miss_cnt\fR contains the number of isochronous cycles missed since last
524 transfer due to data buffer under run. This can happen when an application does
525 not supply data fast enough.
526 .sp
527 For the purposes of time stamping, the driver considers the first packet in a
528 frame buffer to be the first packet of an AV frame.
529 .RE
530
531 .sp
532 .ne 2
533 .na
534 \fB\fBIEC61883_PLUG_INIT\fR\fR
535 .ad
536 .sp .6
537 .RS 4n
538 This command returns a handle for the specified plug. The argument is a pointer
539 to the structure:
540 .sp
541 .in +2
542 .nf
543 typedef struct iec61883_plug_init {
544 int pi_ver; /* interface version */
545 int pi_loc; /* plug location */
546 int pi_type; /* plug type */
547 int pi_num; /* plug number */
548 int pi_flags; /* flags */
549 int pi_handle; /* plug handle */
550 int pi_rnum; /* plug number */
551 } iec61883_plug_init_t;
552 .fi
553 .in -2
554 .sp
555
556 \fBpi_ver\fR should be set to \fBIEC61883_V1_0\fR.
557 .sp
558 \fBpi_loc\fR specifies plug location:
559 .sp
560 .ne 2
561 .na
562 \fB\fBIEC61883_LOC_LOCAL\fR\fR
563 .ad
564 .sp .6
565 .RS 4n
566 On the local unit (local plug). A plug control register (PCR) is allocated.
567 Command fails if the plug already exists
568 .RE
569
570 .sp
571 .ne 2
572 .na
573 \fB\fBIEC61883_LOC_REMOTE\fR\fR
574 .ad
575 .sp .6
576 .RS 4n
577 On the remote unit (remote plug). The plug should exist on the remote unit,
578 otherwise the command fails.
579 .RE
580
581 \fBpi_type\fR specifies isochronous plug type:
582 .sp
583 .ne 2
584 .na
585 \fB\fBIEC61883_PLUG_IN IEC61883_PLUG_OUT\fR\fR
586 .ad
587 .sp .6
588 .RS 4n
589 Input or output plugs.
590 .RE
591
592 .sp
593 .ne 2
594 .na
595 \fB\fBIEC61883_PLUG_MASTER_IN IEC61883_PLUG_MASTER_OUT\fR\fR
596 .ad
597 .sp .6
598 .RS 4n
599 Master input or master output plug. These plugs always exist on the local unit.
600 .RE
601
602 \fBpi_num\fR specifies plug number. This should be 0 for master plugs, and from
603 0 to 31 for input/output plugs. Alternatively, a special value
604 \fBIEC61883_PLUG_ANY\fR can be used to let the driver choose a free plug
605 number, create the plug and return the number in \fBpi_rnum\fR.
606 .sp
607 \fBpi_flags\fR should be set to 0.
608 .sp
609 If the command succeeds, \fBpi_handle\fR contains a handle that should be used
610 with other plug commands.
611 .RE
612
613 .sp
614 .ne 2
615 .na
616 \fB\fBIEC61883_PLUG_FINI\fR\fR
617 .ad
618 .sp .6
619 .RS 4n
620 Argument is a handle returned by \fBIEC61883_PLUG_INIT\fR. This command frees
621 any resources associated with this handle, including the PCR.
622 .RE
623
624 .sp
625 .ne 2
626 .na
627 \fB\fBIEC61883_PLUG_REG_READ\fR\fR
628 .ad
629 .sp .6
630 .RS 4n
631 Read plug register value. The argument is a pointer to the structure:
632 .sp
633 .in +2
634 .nf
635 typedef struct iec61883_plug_reg_val {
636 int pr_handle; /* plug handle */
637 uint32_t pr_val; /* register value */
638 } iec61883_plug_reg_val_t;
639 .fi
640 .in -2
641 .sp
642
643 \fBpr_handle\fR is a handle returned by \fBIEC61883_PLUG_INIT\fR. Register
644 value is returned in \fBpr_val\fR.
645 .RE
646
647 .sp
648 .ne 2
649 .na
650 \fB\fBIEC61883_PLUG_REG_CAS\fR\fR
651 .ad
652 .sp .6
653 .RS 4n
654 Atomically compare and swap plug register value. The argument is a pointer to
655 the structure:
656 .sp
657 .in +2
658 .nf
659 typedef struct iec61883_plug_reg_lock {
660 int pl_handle; /* plug handle */
661 uint32_t pl_arg; /* compare arg */
662 uint32_t pl_data; /* write value */
663 UINT32_t pl_old; /* original value */
664 } iec61883_plug_reg_lock_t;
665 .fi
666 .in -2
667 .sp
668
669 pr_handle is a handle returned by IEC61883_PLUG_INIT.
670 .sp
671 Original register value is compared with pl_arg and if they are equal, register
672 value is replaced with pl_data. In any case, the original value is stored in
673 pl_old.
674 .RE
675
676 .sp
677 .LP
678 The following commands only apply to asynchronous nodes:
679 .sp
680 .ne 2
681 .na
682 \fB\fBIEC61883_ARQ_GET_IBUF_SIZE\fR\fR
683 .ad
684 .sp .6
685 .RS 4n
686 This command returns current incoming ARQ buffer size. The argument is a
687 pointer to \fBint\fR.
688 .RE
689
690 .sp
691 .ne 2
692 .na
693 \fB\fBIEC61883_ARQ_SET_IBUF_SIZE\fR\fR
694 .ad
695 .sp .6
696 .RS 4n
697 This command changes incoming ARQ buffer size. The argument is the new buffer
698 size in bytes.
699 .RE
700
701 .SH FILES
702 .sp
703 .ne 2
704 .na
705 \fB\fB/dev/av/N/async\fR\fR
706 .ad
707 .RS 19n
708 Device node for asynchronous data
709 .RE
710
711 .sp
712 .ne 2
713 .na
714 \fB\fB/dev/av/N/isoch\fR\fR
715 .ad
716 .RS 19n
717 Device has been disconnected
718 .RE
719
720 .SH ERRORS
721 .sp
722 .ne 2
723 .na
724 \fB\fBEIO\fR\fR
725 .ad
726 .RS 10n
727 Bus operation failed.
728 .sp
729 DMA failure.
730 .RE
731
732 .sp
733 .ne 2
734 .na
735 \fB\fBEFAULT\fR\fR
736 .ad
737 .RS 10n
738 \fBioctl\fR(2) argument points to an illegal address.
739 .RE
740
741 .sp
742 .ne 2
743 .na
744 \fB\fBEINVAL\fR\fR
745 .ad
746 .RS 10n
747 Invalid argument or argument combination.
748 .RE
749
750 .sp
751 .ne 2
752 .na
753 \fB\fBENODEV\fR\fR
754 .ad
755 .RS 10n
756 Device has been disconnected.
757 .RE
758
759 .SH ATTRIBUTES
760 .sp
761 .LP
762 See \fBattributes\fR(5) for descriptions of the following attributes:
763 .sp
764
765 .sp
766 .TS
767 box;
768 c | c
769 l | l .
770 ATTRIBUTE TYPE ATTRIBUTE VALUE
771 _
772 Architecture All
773 _
774 Stability level Committed
775 .TE
776
777 .SH SEE ALSO
778 .sp
779 .LP
780 \fBioctl\fR(2), \fBmmap\fR(2), \fBopen\fR(2), \fBpoll\fR(2), \fBread\fR(2),
781 \fBwrite\fR(2), \fBattributes\fR(5), \fBav1394\fR(7D)
782 .sp
783 .LP
784 \fIIEC 61883 Consumer audio/video equipment - Digital interface\fR
785 .sp
786 .LP
787 \fIIEEE Std 1394-1995 Standard for a High Performance Serial Bus\fR
|
1 .\" Copyright (c) 2009, Sun Microsystems, Inc. All Rights Reserved
2 .\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License. You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.
3 .\" See the License for the specific language governing permissions and limitations under the License. When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the
4 .\" fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
5 .Dd July 9, 2018
6 .Dt IEC61883 7I
7 .Os
8 .Sh NAME
9 .Nm iec61883
10 .Nd IEC 61883 interfaces
11 .Sh SYNOPSIS
12 .In sys/av/iec61883.h
13 .Sh DESCRIPTION
14 The set of interfaces described in this man page can be used to control and
15 exchange data with consumer audio/video devices using protocols specified
16 in
17 .%T "IIEC 61883 Consumer Electronic Audio/Video Equipment - Digital Interface"
18 including Common Isochronous Packet (CIP), Connection Management
19 Procedures (CMP) and Function Control Protocol (FCP).
20 .Pp
21 An
22 .Nm
23 compliant driver exports two device nodes for isochronous and
24 for asynchronous transactions.
25 See the
26 .Sx FILES
27 section of this man page for the namespace definition.
28 .Ss "Isochronous Transfers"
29 Two methods are provided to receive/transmit isochronous data: using
30 .Xr mmap 2
31 in combination with
32 .Xr ioctl 2 ,
33 and
34 .Xr read 2
35 or
36 .Xr write 2 .
37 .Ss "Mmap/Ioctl"
38 This method provides better performance and finer-grained control than
39 read/write, and is a method of choice for most applications.
40 The data buffer is
41 mapped into a user process address space, which means no data copying between
42 the kernel and an application is necessary.
43 Synchronization between user
44 processes and the driver is performed using
45 .Xr ioctl 2
46 commands.
47 .Pp
48 An application allocates resources for isochronous transfer using
49 .Dv IEC61883_ISOCH_INIT .
50 Then the data buffer can be mapped into the process
51 space using
52 .Xr mmap 2 .
53 .Pp
54 A circular data buffer consists of one or more equal size frame buffers
55 (further referred to as frames, unless to avoid ambiguity with AV frames).
56 Frames are numbered starting with zero and are always transferred sequentially.
57 Frames consist equal sized packets.
58 Each packet contains a CIP header and one or more data blocks.
59 .Pp
60 A driver and an application act as a producer and a consumer: producer supplies
61 .Em full
62 frames (filled with data) to the consumer, and the producer is not
63 allowed to access those frames until the consumer claims them
64 .Em empty .
65 .Pp
66 A transfer can be initiated and suspended with
67 .Dv IEC61883_START
68 and
69 .Dv IEC61883_STOP
70 commands respectively.
71 .Dv IEC61883_RECV
72 or
73 .Dv IEC61883_XMIT
74 is used for producer-consumer synchronization.
75 .Ss "Read/Write"
76 Using this method, an application calls
77 .Xr read 2
78 or
79 .Xr write 2
80 to receive or transmit a specified amount of data.
81 Bus-specific overhead, such as isochronous packet headers, is handled by the driver
82 and is not exposed to applications.
83 Data returned by
84 .Xr read 2
85 contains CIP headers and data blocks.
86 Empty packets are not returned by
87 .Xr read 2 .
88 .Xr write 2
89 data should meet the same requirements.
90 .Pp
91 If one or more channels have been allocated since
92 .Xr open 2
93 (see
94 .Dv IEC61883_ISOCH_INIT ) ,
95 the data is received/transmitted using channel that was created the last.
96 .Pp
97 If no channels were allocated, the driver uses the broadcast channel by default
98 and allocates the default-size data buffer.
99 During transmit, the first packet's CIP header is used to auto-detect the data format.
100 If it is one of the formats supported by the driver, it is properly transmitted (with
101 inserted empty packets and timestamps).
102 .Pp
103 For both methods, if during transmit the driver runs out of data, it transmits
104 empty packets containing only a CIP header of the next to be transmitted
105 packet, as defined in
106 .Em IEC 61883-1 .
107 .Ss "Connection Management Procedures"
108 Applications wishing to follow Connection Management Procedures (CMP) in
109 combination with isochronous transfers should use the
110 .Xr ioctl 2
111 .Dv IEC61883_PLUG_INIT ,
112 .Dv IEC61883_PLUG_FINI ,
113 .Dv IEC61883_PLUG_REG_READ
114 and
115 .Dv IEC61883_PLUG_REG_CAS
116 commands.
117 .Ss "Asynchronous Transactions"
118 .Xr read 2 ,
119 .Xr write 2 ,
120 .Xr ioctl 2 ,
121 and
122 .Xr poll 2
123 can be used
124 with asynchronous nodes.
125 Asynchronous data exchange between a driver and an
126 application utilizes a common data structure called asynchronous request (ARQ):
127 .Bd -literal -offset 2n
128 typedef struct iec61883_arq {
129 int arq_type;
130 int arq_len;
131 union {
132 uint32_t quadlet;
133 uint64_t octlet;
134 uint8_t buf[8];
135 } arq_data;
136 } iec61883_arq_t;
137 .Ed
138 .Pp
139 .Fa arq_type
140 contains
141 .Sy ARQ
142 type:
143 .Pp
144 .Bl -tag -width " " -compact
145 .It Dv IEC61883_ARQ_FCP_CMD
146 .It Dv IEC61883_ARQ_FCP_RESP
147 .Pp
148 .Sy FCP
149 command and response frame respectively.
150 Outgoing frames are sent using
151 .Xr write 2 ,
152 incoming frames are received with
153 .Xr read 2 .
154 .Pp
155 See
156 .Em IIEC 61883-1
157 for the FCP frame structure definition.
158 .Pp
159 .It Dv IEC61883_ARQ_BUS_RESET
160 .Pp
161 Returned by the driver when a bus reset occurs.
162 There is no data associated with this request type, and \fBarq_len\fR is set to 0.
163 .El
164 .Pp
165 If
166 .Fa arq_len
167 is 4 or 8, then data should be supplied in
168 .Fa arq_data.quadlet
169 or
170 .Fa arq_data.octlet
171 respectively, otherwise up to 8 bytes can be put in
172 .Fa arq_data.buf ,
173 with the rest of the data following immediately after.
174 .Ss "write(2)"
175 For a request to be sent to a target, an
176 .Vt iec61883_arq_t
177 structure along with associated data is passed to the driver using
178 .Xr write 2 .
179 .Xr write 2
180 blocks until the request is completed.
181 .Ss "read(2)"
182 A driver collects incoming ARQs in the internal buffer.
183 Buffer size can be changed using the
184 .Xr ioctl 2
185 command
186 .Vt IEC61883_FCP_SET_IBUF_SIZE .
187 .Pp
188 Reading an ARQ takes one or two steps depending on data length.
189 An application
190 first reads
191 .Ql sizeof (iec61883_arq_t)
192 bytes: if
193 .Fa arq_len
194 is less than or equal 4, which is usually the case, no additional step is needed.
195 Otherwise,
196 the remaining
197 .Ql arq_len - 4
198 bytes should be read and concatenated.
199 .Pp
200 .Xr read 2
201 blocks until the specified amount of data is available, unless
202 .Dv O_NONBLOCK
203 or
204 .Dv O_NDELAY
205 flag was set during
206 .Xr open 2 ,
207 in which case
208 .Xr read 2
209 returns immediately.
210 .Ss "poll(2)"
211 Applications can
212 .Xr poll 2
213 asynchronous nodes on the
214 .Dv POLLIN
215 event.
216 .Ss "Bus Reset"
217 In case of a bus reset, the driver notifies an application by generating an
218 .Sy ARQ
219 of type
220 .Dv IEC61883_ARQ_BUS_RESET .
221 .Pp
222 If there were established isochronous connections before bus reset, the driver
223 attempts to restore all connections as described in
224 .Em IEC 61883
225 and resume any active transfers that were in progress.
226 .Sh IOCTLS
227 The following commands only apply to isochronous nodes:
228 .Bl -tag -width " "
229 .It Dv IEC61883_ISOCH_INIT
230 .Pp
231 This command allocates a data buffer and isochronous resources (if necessary)
232 for the isochronous transfer.
233 The argument is a pointer to the structure:
234 .Bd -literal -offset 2n
235 typedef struct iec61883_isoch_init {
236 int ii_version; /* interface version */
237 int ii_pkt_size; /* packet size */
238 int ii_frame_size; /* packets/frame */
239 int ii_frame_cnt; /* # of frames */
240 int ii_direction; /* xfer direction */
241 int ii_bus_speed; /* bus speed */
242 uint64_t ii_channel; /* channel mask */
243 int ii_dbs; /* DBS */
244 int ii_fn; /* FN */
245 int ii_rate_n; /* rate numerator */
246 int ii_rate_d; /* rate denominator */
247 int ii_ts_mode; /* timestamp mode */
248 int ii_flags; /* flags */
249 int ii_handle; /* isoch handle */
250 int ii_frame_rcnt; /* # of frames */
251 off_t *ii_mmap_off /* mmap offset */
252 int ii_rchannel; /* channel */
253 int ii_error; /* error code */
254 } iec61883_isoch_init_t;
255 .Ed
256 .Pp
257 .Fa ii_version
258 should be set to
259 .Dv IEC61883_V1_0 .
260 .Pp
261 The driver attempts to allocate a data buffer consisting of
262 .Fa ii_frame_cnt
263 frames, with
264 .Fa ii_frame_size
265 packets in each frame.
266 Packet size in bytes is specified by
267 .Fa ii_pkt_size
268 specifies and should be a multiple of 512 and compatible with
269 .Fa ii_bus_speed .
270 .Pp
271 .Fa ii_direction
272 can take one of the following values:
273 .Bl -tag -width "IEC61883_DIR_RECV"
274 .It Dv IEC61883_DIR_RECV
275 Receiving isochronous data.
276 .It Dv IEC61883_DIR_XMIT
277 Transmitting isochronous data.
278 .El
279 .Pp
280 .Fa ii_bus_speed
281 chooses bus speed to be used and can be either
282 .Dv IEC61883_S100 ,
283 .Dv IEC61883_S200
284 or
285 .Dv IEC61883_S400 .
286 .Pp
287 .Fa ii_channel
288 is a mask that specifies an isochronous channel number to be
289 used, with the
290 .Em N Ns th
291 bit representing channel
292 .Em N .
293 When transmitting data, several bits can be set at a time, in which case the
294 driver chooses one, for example,
295 .Sy 0x3FF
296 means a range from 0 to 9.
297 In case of receive, only one bit can be set.
298 .Pp
299 .Fa ii_dbs
300 specifies data block size in quadlets, for example, DBS value for
301 .Dv SD-DVCR
302 is
303 .Sy 0x78 .
304 Refer to
305 .Em IEC 61883
306 for more details on DBS.
307 .Pp
308 .Fa ii_fn
309 specifies fraction number, which defines the number of blocks in which a
310 source packet is divided.
311 Allowed values are from 0 to 3.
312 Refer to
313 .Em IEC 61883
314 for more details on FN.
315 .Pp
316 Data rate expected by the AV device can be lower than the bus speed, in which
317 case the driver has to periodically insert empty packets into the data stream
318 to avoid device buffer overflows.
319 This rate is specified with a fraction N/D,
320 set by
321 .Fa ii_rate_n
322 and
323 .Fa ii_rate_d
324 respectively.
325 Any integer numbers can be used, or the following predefined constants:
326 .Pp
327 .Bl -tag -width "IEC61883_RATE_N_DV_NTSC" -compact
328 .It Dv IEC61883_RATE_N_DV_NTSC
329 .It Dv IEC61883_RATE_D_DV_NTSC
330 Data rate expected by
331 .Sy DV-NTSC
332 devices.
333 .Pp
334 .It Dv IEC61883_RATE_N_DV_PAL
335 .It Dv IEC61883_RATE_D_DV_PAL
336 Data rate expected by
337 .Sy DV-PAL
338 devices.
339 .El
340 .Pp
341 During data transmission, a timestamp based on the current value of the cycle
342 timer is usually required.
343 .Fa ii_ts_mode
344 defines timestamp mode to be used:
345 .Bl -tag -width IEC61883_TS_NONE
346 .It Dv IEC61883_TS_SYT
347 Driver puts a timestamp in the SYT field of the first CIP header of each frame.
348 .It Dv IEC61883_TS_NONE
349 No timestamps.
350 .El
351 .Pp
352 .Fa ii_dbs ,
353 .Fa ii_fn ,
354 .Fa ii_rate_n ,
355 .Fa ii_rate_d
356 and
357 .Fa ii_ts_mode
358 are only required for transmission.
359 In other case these should be set to 0.
360 .Pp
361 .Fa ii_flags
362 should be set to 0.
363 .Pp
364 If command succeeds,
365 .Fa ii_handle
366 contains a handle that should be used with other isochronous commands.
367 .Fa ii_frame_rcnt
368 contains the number of allocated frames (can be less than
369 .Fa ii_frame_cnt ) .
370 .Fa ii_mmap_off
371 contains an offset to be used in
372 .Xr mmap 2 ,
373 for example, to map an entire data receive buffer:
374 .Bd -literal -offset 2n
375 pa = mmap(NULL, init.ii_pkt_size *
376 init.ii_frame_size * init.ii_frame_rcnt,
377 PROT_READ, MAP_PRIVATE, fd, init.ii_mmap_off);
378 .Ed
379 .Pp
380 .Fa ii_rchannel
381 contains channel number.
382 .Pp
383 In case of command success,
384 .Fa ii_error
385 is set to 0; otherwise one of the following values can be returned:
386 .Bl -tag -width IEC61883_ERR_NOCHANNEL
387 .It Dv IEC61883_ERR_NOMEM
388 Not enough memory for the data buffer.
389 .It Dv IEC61883_ERR_NOCHANNEL
390 Cannot allocate isochronous channel.
391 .It Dv IEC61883_ERR_PKT_SIZE
392 Packet size is not allowed at this bus speed.
393 .It Dv IEC61883_ERR_VERSION
394 Interface version is not supported.
395 .It Dv IEC61883_ERR_INVAL
396 One or more the parameters are invalid
397 .It Dv IEC61883_ERR_OTHER
398 Unspecified error type.
399 .El
400 .It Dv IEC61883_ISOCH_FINI
401 .Pp
402 Argument is a handle returned by
403 .Dv IEC61883_ISOCH_INIT .
404 This command frees any resources associated with this handle.
405 There must be no active transfers
406 and the data buffer must be unmapped; otherwise the command fails.
407 .It Dv IEC61883_START
408 .Pp
409 This command starts an isochronous transfer.
410 The argument is a handle returned
411 by
412 .Dv IEC61883_ISOCH_INIT .
413 .It Dv IEC61883_STOP
414 .Pp
415 This command stops an isochronous transfer.
416 The argument is a handle returned by
417 .Dv IEC61883_ISOCH_INIT .
418 .It Dv IEC61883_RECV
419 .Pp
420 This command is used to receive full frames and return empty frames to the driver.
421 The argument is a pointer to the structure:
422 .Bd -literal -offset 2n
423 typedef struct iec61883_recv {
424 int rx_handle; /* isoch handle */
425 int rx_flags; /* flags */
426 iec61883_xfer_t rx_xfer; /* xfer params */
427 } iec61883_recv_t;
428
429 typedef struct iec61883_xfer {
430 int xf_empty_idx; /* first empty frame */
431 int xf_empty_cnt; /* empty frame count */
432 int xf_full_idx; /* first full frame */
433 int xf_full_cnt; /* full frame count */
434 int xf_error; /* error */
435 } iec61883_xfer_t;
436 .Ed
437 .Pp
438 .Fa rx_flags
439 should be set to 0.
440 .Pp
441 An application sets
442 .Fa xf_empty_idx
443 and
444 .Fa xf_empty_cnt
445 to indicate frames it no longer needs.
446 E. g. if a buffer consists of 6 frames,
447 .Fa xf_empty_idx
448 is 4,
449 .Fa xf_empty_cnt
450 is 3 - means that frames 4, 5 and 0 can now be reused by the driver.
451 If there are no empty frames, for example, the
452 first time this command is called,
453 .Fa xf_empty_cnt
454 should be set to 0.
455 .Pp
456 When the command returns,
457 .Fa xf_full_idx
458 and
459 .Fa xf_full_cnt
460 specifies the frames that are full.
461 .Fa xf_error
462 is always 0.
463 .Pp
464 In general, AV frame boundaries are not aligned with the frame buffer
465 boundaries, because the first received packet might not be the first packet of
466 an AV frame, and, in contrast with the read/write method, the driver does not
467 remove empty CIP packets.
468 .Pp
469 Applications should detect empty packets by comparing adjacent packets'
470 continuity counters (DBC field of the CIP header).
471 .It Dv IEC61883_XMIT
472 .Pp
473 This command is used to transmit full frames and get more empty frames from the
474 driver.
475 The argument is a pointer to the structure:
476 .Bd -literal -offset 2n
477 typedef struct iec61883_xmit {
478 int tx_handle; /* isoch handle */
479 int tx_flags; /* flags */
480 iec61883_xfer_t tx_xfer; /* xfer params */
481 int tx_miss_cnt; /* missed cycles */
482 } iec61883_xmit_t;
483 .Ed
484 .Pp
485 .Fa tx_flags
486 should be set to zero.
487 .Pp
488 The application sets
489 .Fa xf_full_idx
490 and
491 .Fa xf_full_cnt
492 to specify frames it wishes to transmit.
493 If there are no frames to transmit (e. g. the first time this command is called),
494 .Fa xf_full_cnt
495 should be set to 0.
496 .Pp
497 When the command returns,
498 .Fa xf_empty_idx
499 and
500 .Fa xf_empty_cnt
501 specifies empty frames which can be to transmit more data.
502 .Fa xf_error
503 is always 0.
504 .Pp
505 .Fa tx_miss_cnt
506 contains the number of isochronous cycles missed since last
507 transfer due to data buffer under run.
508 This can happen when an application does not supply data fast enough.
509 For the purposes of time stamping, the driver considers the first packet in a
510 frame buffer to be the first packet of an AV frame.
511 .It Dv IEC61883_PLUG_INIT
512 .Pp
513 This command returns a handle for the specified plug.
514 The argument is a pointer
515 to the structure:
516 .Bd -literal -offset 2n
517 typedef struct iec61883_plug_init {
518 int pi_ver; /* interface version */
519 int pi_loc; /* plug location */
520 int pi_type; /* plug type */
521 int pi_num; /* plug number */
522 int pi_flags; /* flags */
523 int pi_handle; /* plug handle */
524 int pi_rnum; /* plug number */
525 } iec61883_plug_init_t;
526 .Ed
527 .Pp
528 .Fa pi_ver
529 should be set to
530 .Dv IEC61883_V1_0 .
531 .Pp
532 .Fa pi_loc
533 specifies plug location:
534 .Bl -tag -width IEC61883_LOC_REMOTE
535 .It Dv IEC61883_LOC_LOCAL
536 On the local unit (local plug).
537 A plug control register (PCR) is allocated.
538 Command fails if the plug already exists
539 .It Dv IEC61883_LOC_REMOTE
540 On the remote unit (remote plug).
541 The plug should exist on the remote unit,
542 otherwise the command fails.
543 .El
544 .Pp
545 .Fa pi_type
546 specifies isochronous plug type:
547 .Pp
548 .Bl -tag -width " " -compact
549 .It Dv IEC61883_PLUG_IN
550 .It Dv IEC61883_PLUG_OUT
551 .Pp
552 Input or output plugs.
553 .Pp
554 .It Dv IEC61883_PLUG_MASTER_IN
555 .It Dv IEC61883_PLUG_MASTER_OUT
556 .Pp
557 Master input or master output plug.
558 These plugs always exist on the local unit.
559 .El
560 .Pp
561 .Fa pi_num
562 specifies plug number.
563 This should be 0 for master plugs, and from 0 to 31 for input/output plugs.
564 Alternatively, a special value
565 .Dv IEC61883_PLUG_ANY
566 can be used to let the driver choose a free plug
567 number, create the plug and return the number in
568 .Fa pi_rnum .
569 .Pp
570 .Fa pi_flags
571 should be set to 0.
572 .Pp
573 If the command succeeds,
574 .Fa pi_handle
575 contains a handle that should be used with other plug commands.
576 .It Dv IEC61883_PLUG_FINI
577 .Pp
578 Argument is a handle returned by
579 .Dv IEC61883_PLUG_INIT .
580 This command frees any resources associated with this handle, including the PCR.
581 .It Dv IEC61883_PLUG_REG_READ
582 .Pp
583 Read plug register value.
584 The argument is a pointer to the structure:
585 .Bd -literal -offset 2n
586 typedef struct iec61883_plug_reg_val {
587 int pr_handle; /* plug handle */
588 uint32_t pr_val; /* register value */
589 } iec61883_plug_reg_val_t;
590 .Ed
591 .Pp
592 .Fa pr_handle
593 is a handle returned by
594 .Dv IEC61883_PLUG_INIT .
595 Register
596 value is returned in
597 .Fa pr_val .
598 .It Dv IEC61883_PLUG_REG_CAS
599 .Pp
600 Atomically compare and swap plug register value.
601 The argument is a pointer to the structure:
602 .Bd -literal -offset 2n
603 typedef struct iec61883_plug_reg_lock {
604 int pl_handle; /* plug handle */
605 uint32_t pl_arg; /* compare arg */
606 uint32_t pl_data; /* write value */
607 UINT32_t pl_old; /* original value */
608 } iec61883_plug_reg_lock_t;
609 .Ed
610 .Pp
611 .Fa pr_handle
612 is a handle returned by IEC61883_PLUG_INIT.
613 .Pp
614 Original register value is compared with
615 .Fa pl_arg
616 and if they are equal, register value is replaced with
617 .Fa pl_data .
618 In any case, the original value is stored in
619 .Fa pl_old .
620 .El
621 .Pp
622 The following commands only apply to asynchronous nodes:
623 .Bl -tag -width " "
624 .It Dv IEC61883_ARQ_GET_IBUF_SIZE
625 .Pp
626 This command returns current incoming ARQ buffer size.
627 The argument is a
628 pointer to
629 .Vt int .
630 .It Dv IEC61883_ARQ_SET_IBUF_SIZE
631 .Pp
632 This command changes incoming ARQ buffer size.
633 The argument is the new buffer
634 size in bytes.
635 .El
636 .Sh FILES
637 .Bl -tag -width /dev/av/N/async
638 .It Pa /dev/av/N/async
639 Device node for asynchronous data
640 .It Pa /dev/av/N/isoch
641 Device has been disconnected
642 .El
643 .Sh ERRORS
644 .Bl -tag -width EFAULT
645 .It Er EIO
646 Bus operation failed.
647 DMA failure.
648 .It Er EFAULT
649 .Xr ioctl 2
650 argument points to an illegal address.
651 .It Er EINVAL
652 Invalid argument or argument combination.
653 .It Er ENODEV
654 Device has been disconnected.
655 .El
656 .Sh ARCHITECTURE
657 All
658 .Sh INTERFACE STABILITY
659 Committed
660 .Sh SEE ALSO
661 .Xr ioctl 2 ,
662 .Xr mmap 2 ,
663 .Xr open 2 ,
664 .Xr poll 2 ,
665 .Xr read 2 ,
666 .Xr write 2 ,
667 .Xr attributes 5 ,
668 .Xr av1394 7D
669 .Rs
670 .%B IIEC 61883 Consumer audio/video equipment - Digital interface
671 .Re
672 .Rs
673 .%B IEEE Std 1394-1995 Standard for a High Performance Serial Bus
674 .Re
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