1 /*
2 * Audio crossconnecting/conferrencing (hardware level).
3 *
4 * Copyright 2002 by Andreas Eversberg (jolly@eversberg.eu)
5 *
6 * This software may be used and distributed according to the terms
7 * of the GNU General Public License, incorporated herein by reference.
8 *
9 */
10
11 /*
12 * The process of adding and removing parties to/from a conference:
13 *
14 * There is a chain of struct dsp_conf which has one or more members in a chain
15 * of struct dsp_conf_member.
16 *
17 * After a party is added, the conference is checked for hardware capability.
18 * Also if a party is removed, the conference is checked again.
19 *
20 * There are 3 different solutions: -1 = software, 0 = hardware-crossconnect
21 * 1-n = hardware-conference. The n will give the conference number.
22 *
23 * Depending on the change after removal or insertion of a party, hardware
24 * commands are given.
25 *
26 * The current solution is stored within the struct dsp_conf entry.
27 */
28
29 /*
30 * HOW THE CMX WORKS:
31 *
32 * There are 3 types of interaction: One member is alone, in this case only
33 * data flow from upper to lower layer is done.
34 * Two members will also exchange their data so they are crossconnected.
35 * Three or more members will be added in a conference and will hear each
36 * other but will not receive their own speech (echo) if not enabled.
37 *
38 * Features of CMX are:
39 * - Crossconnecting or even conference, if more than two members are together.
40 * - Force mixing of transmit data with other crossconnect/conference members.
41 * - Echo generation to benchmark the delay of audio processing.
42 * - Use hardware to minimize cpu load, disable FIFO load and minimize delay.
43 * - Dejittering and clock generation.
44 *
45 * There are 2 buffers:
46 *
47 *
48 * RX-Buffer
49 * R W
50 * | |
51 * ----------------+-------------+-------------------
52 *
53 * The rx-buffer is a ring buffer used to store the received data for each
54 * individual member. This is only the case if data needs to be dejittered
55 * or in case of a conference where different clocks require reclocking.
56 * The transmit-clock (R) will read the buffer.
57 * If the clock overruns the write-pointer, we will have a buffer underrun.
58 * If the write pointer always has a certain distance from the transmit-
59 * clock, we will have a delay. The delay will dynamically be increased and
60 * reduced.
61 *
62 *
63 * TX-Buffer
64 * R W
65 * | |
66 * -----------------+--------+-----------------------
67 *
68 * The tx-buffer is a ring buffer to queue the transmit data from user space
69 * until it will be mixed or sent. There are two pointers, R and W. If the write
70 * pointer W would reach or overrun R, the buffer would overrun. In this case
71 * (some) data is dropped so that it will not overrun.
72 * Additionally a dynamic dejittering can be enabled. this allows data from
73 * user space that have jitter and different clock source.
74 *
75 *
76 * Clock:
77 *
78 * A Clock is not required, if the data source has exactly one clock. In this
79 * case the data source is forwarded to the destination.
80 *
81 * A Clock is required, because the data source
82 * - has multiple clocks.
83 * - has no usable clock due to jitter or packet loss (VoIP).
84 * In this case the system's clock is used. The clock resolution depends on
85 * the jiffie resolution.
86 *
87 * If a member joins a conference:
88 *
89 * - If a member joins, its rx_buff is set to silence and change read pointer
90 * to transmit clock.
91 *
92 * The procedure of received data from card is explained in cmx_receive.
93 * The procedure of received data from user space is explained in cmx_transmit.
94 * The procedure of transmit data to card is cmx_send.
95 *
96 *
97 * Interaction with other features:
98 *
99 * DTMF:
100 * DTMF decoding is done before the data is crossconnected.
101 *
102 * Volume change:
103 * Changing rx-volume is done before the data is crossconnected. The tx-volume
104 * must be changed whenever data is transmitted to the card by the cmx.
105 *
106 * Tones:
107 * If a tone is enabled, it will be processed whenever data is transmitted to
108 * the card. It will replace the tx-data from the user space.
109 * If tones are generated by hardware, this conference member is removed for
110 * this time.
111 *
112 * Disable rx-data:
113 * If cmx is realized in hardware, rx data will be disabled if requested by
114 * the upper layer. If dtmf decoding is done by software and enabled, rx data
115 * will not be disabled but blocked to the upper layer.
116 *
117 * HFC conference engine:
118 * If it is possible to realize all features using hardware, hardware will be
119 * used if not forbidden by control command. Disabling rx-data provides
120 * absolutely traffic free audio processing. (except for the quick 1-frame
121 * upload of a tone loop, only once for a new tone)
122 *
123 */
124
125 /* delay.h is required for hw_lock.h */
126
127 #include <linux/slab.h>
128 #include <linux/delay.h>
129 #include <linux/mISDNif.h>
130 #include <linux/mISDNdsp.h>
131 #include "core.h"
132 #include "dsp.h"
133 /*
134 * debugging of multi party conference,
135 * by using conference even with two members
136 */
137
138 /* #define CMX_CONF_DEBUG */
139
140 /*#define CMX_DEBUG * massive read/write pointer output */
141 /*#define CMX_DELAY_DEBUG * gives rx-buffer delay overview */
142 /*#define CMX_TX_DEBUG * massive read/write on tx-buffer with content */
143
144 static inline int
count_list_member(struct list_head * head)145 count_list_member(struct list_head *head)
146 {
147 int cnt = 0;
148 struct list_head *m;
149
150 list_for_each(m, head)
151 cnt++;
152 return cnt;
153 }
154
155 /*
156 * debug cmx memory structure
157 */
158 void
dsp_cmx_debug(struct dsp * dsp)159 dsp_cmx_debug(struct dsp *dsp)
160 {
161 struct dsp_conf *conf;
162 struct dsp_conf_member *member;
163 struct dsp *odsp;
164
165 printk(KERN_DEBUG "-----Current DSP\n");
166 list_for_each_entry(odsp, &dsp_ilist, list) {
167 printk(KERN_DEBUG "* %s hardecho=%d softecho=%d txmix=%d",
168 odsp->name, odsp->echo.hardware, odsp->echo.software,
169 odsp->tx_mix);
170 if (odsp->conf)
171 printk(" (Conf %d)", odsp->conf->id);
172 if (dsp == odsp)
173 printk(" *this*");
174 printk("\n");
175 }
176 printk(KERN_DEBUG "-----Current Conf:\n");
177 list_for_each_entry(conf, &conf_ilist, list) {
178 printk(KERN_DEBUG "* Conf %d (%p)\n", conf->id, conf);
179 list_for_each_entry(member, &conf->mlist, list) {
180 printk(KERN_DEBUG
181 " - member = %s (slot_tx %d, bank_tx %d, "
182 "slot_rx %d, bank_rx %d hfc_conf %d "
183 "tx_data %d rx_is_off %d)%s\n",
184 member->dsp->name, member->dsp->pcm_slot_tx,
185 member->dsp->pcm_bank_tx, member->dsp->pcm_slot_rx,
186 member->dsp->pcm_bank_rx, member->dsp->hfc_conf,
187 member->dsp->tx_data, member->dsp->rx_is_off,
188 (member->dsp == dsp) ? " *this*" : "");
189 }
190 }
191 printk(KERN_DEBUG "-----end\n");
192 }
193
194 /*
195 * search conference
196 */
197 static struct dsp_conf *
dsp_cmx_search_conf(u32 id)198 dsp_cmx_search_conf(u32 id)
199 {
200 struct dsp_conf *conf;
201
202 if (!id) {
203 printk(KERN_WARNING "%s: conference ID is 0.\n", __func__);
204 return NULL;
205 }
206
207 /* search conference */
208 list_for_each_entry(conf, &conf_ilist, list)
209 if (conf->id == id)
210 return conf;
211
212 return NULL;
213 }
214
215
216 /*
217 * add member to conference
218 */
219 static int
dsp_cmx_add_conf_member(struct dsp * dsp,struct dsp_conf * conf)220 dsp_cmx_add_conf_member(struct dsp *dsp, struct dsp_conf *conf)
221 {
222 struct dsp_conf_member *member;
223
224 if (!conf || !dsp) {
225 printk(KERN_WARNING "%s: conf or dsp is 0.\n", __func__);
226 return -EINVAL;
227 }
228 if (dsp->member) {
229 printk(KERN_WARNING "%s: dsp is already member in a conf.\n",
230 __func__);
231 return -EINVAL;
232 }
233
234 if (dsp->conf) {
235 printk(KERN_WARNING "%s: dsp is already in a conf.\n",
236 __func__);
237 return -EINVAL;
238 }
239
240 member = kzalloc(sizeof(struct dsp_conf_member), GFP_ATOMIC);
241 if (!member) {
242 printk(KERN_ERR "kzalloc struct dsp_conf_member failed\n");
243 return -ENOMEM;
244 }
245 member->dsp = dsp;
246 /* clear rx buffer */
247 memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
248 dsp->rx_init = 1; /* rx_W and rx_R will be adjusted on first frame */
249 dsp->rx_W = 0;
250 dsp->rx_R = 0;
251
252 list_add_tail(&member->list, &conf->mlist);
253
254 dsp->conf = conf;
255 dsp->member = member;
256
257 return 0;
258 }
259
260
261 /*
262 * del member from conference
263 */
264 int
dsp_cmx_del_conf_member(struct dsp * dsp)265 dsp_cmx_del_conf_member(struct dsp *dsp)
266 {
267 struct dsp_conf_member *member;
268
269 if (!dsp) {
270 printk(KERN_WARNING "%s: dsp is 0.\n",
271 __func__);
272 return -EINVAL;
273 }
274
275 if (!dsp->conf) {
276 printk(KERN_WARNING "%s: dsp is not in a conf.\n",
277 __func__);
278 return -EINVAL;
279 }
280
281 if (list_empty(&dsp->conf->mlist)) {
282 printk(KERN_WARNING "%s: dsp has linked an empty conf.\n",
283 __func__);
284 return -EINVAL;
285 }
286
287 /* find us in conf */
288 list_for_each_entry(member, &dsp->conf->mlist, list) {
289 if (member->dsp == dsp) {
290 list_del(&member->list);
291 dsp->conf = NULL;
292 dsp->member = NULL;
293 kfree(member);
294 return 0;
295 }
296 }
297 printk(KERN_WARNING
298 "%s: dsp is not present in its own conf_member list.\n",
299 __func__);
300
301 return -EINVAL;
302 }
303
304
305 /*
306 * new conference
307 */
308 static struct dsp_conf
dsp_cmx_new_conf(u32 id)309 *dsp_cmx_new_conf(u32 id)
310 {
311 struct dsp_conf *conf;
312
313 if (!id) {
314 printk(KERN_WARNING "%s: id is 0.\n",
315 __func__);
316 return NULL;
317 }
318
319 conf = kzalloc(sizeof(struct dsp_conf), GFP_ATOMIC);
320 if (!conf) {
321 printk(KERN_ERR "kzalloc struct dsp_conf failed\n");
322 return NULL;
323 }
324 INIT_LIST_HEAD(&conf->mlist);
325 conf->id = id;
326
327 list_add_tail(&conf->list, &conf_ilist);
328
329 return conf;
330 }
331
332
333 /*
334 * del conference
335 */
336 int
dsp_cmx_del_conf(struct dsp_conf * conf)337 dsp_cmx_del_conf(struct dsp_conf *conf)
338 {
339 if (!conf) {
340 printk(KERN_WARNING "%s: conf is null.\n",
341 __func__);
342 return -EINVAL;
343 }
344
345 if (!list_empty(&conf->mlist)) {
346 printk(KERN_WARNING "%s: conf not empty.\n",
347 __func__);
348 return -EINVAL;
349 }
350 list_del(&conf->list);
351 kfree(conf);
352
353 return 0;
354 }
355
356
357 /*
358 * send HW message to hfc card
359 */
360 static void
dsp_cmx_hw_message(struct dsp * dsp,u32 message,u32 param1,u32 param2,u32 param3,u32 param4)361 dsp_cmx_hw_message(struct dsp *dsp, u32 message, u32 param1, u32 param2,
362 u32 param3, u32 param4)
363 {
364 struct mISDN_ctrl_req cq;
365
366 memset(&cq, 0, sizeof(cq));
367 cq.op = message;
368 cq.p1 = param1 | (param2 << 8);
369 cq.p2 = param3 | (param4 << 8);
370 if (dsp->ch.peer)
371 dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq);
372 }
373
374
375 /*
376 * do hardware update and set the software/hardware flag
377 *
378 * either a conference or a dsp instance can be given
379 * if only dsp instance is given, the instance is not associated with a conf
380 * and therefore removed. if a conference is given, the dsp is expected to
381 * be member of that conference.
382 */
383 void
dsp_cmx_hardware(struct dsp_conf * conf,struct dsp * dsp)384 dsp_cmx_hardware(struct dsp_conf *conf, struct dsp *dsp)
385 {
386 struct dsp_conf_member *member, *nextm;
387 struct dsp *finddsp;
388 int memb = 0, i, ii, i1, i2;
389 int freeunits[8];
390 u_char freeslots[256];
391 int same_hfc = -1, same_pcm = -1, current_conf = -1,
392 all_conf = 1, tx_data = 0;
393
394 /* dsp gets updated (no conf) */
395 if (!conf) {
396 if (!dsp)
397 return;
398 if (dsp_debug & DEBUG_DSP_CMX)
399 printk(KERN_DEBUG "%s checking dsp %s\n",
400 __func__, dsp->name);
401 one_member:
402 /* remove HFC conference if enabled */
403 if (dsp->hfc_conf >= 0) {
404 if (dsp_debug & DEBUG_DSP_CMX)
405 printk(KERN_DEBUG
406 "%s removing %s from HFC conf %d "
407 "because dsp is split\n", __func__,
408 dsp->name, dsp->hfc_conf);
409 dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_CONF_SPLIT,
410 0, 0, 0, 0);
411 dsp->hfc_conf = -1;
412 }
413 /* process hw echo */
414 if (dsp->features.pcm_banks < 1)
415 return;
416 if (!dsp->echo.software && !dsp->echo.hardware) {
417 /* NO ECHO: remove PCM slot if assigned */
418 if (dsp->pcm_slot_tx >= 0 || dsp->pcm_slot_rx >= 0) {
419 if (dsp_debug & DEBUG_DSP_CMX)
420 printk(KERN_DEBUG "%s removing %s from"
421 " PCM slot %d (TX) %d (RX) because"
422 " dsp is split (no echo)\n",
423 __func__, dsp->name,
424 dsp->pcm_slot_tx, dsp->pcm_slot_rx);
425 dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_PCM_DISC,
426 0, 0, 0, 0);
427 dsp->pcm_slot_tx = -1;
428 dsp->pcm_bank_tx = -1;
429 dsp->pcm_slot_rx = -1;
430 dsp->pcm_bank_rx = -1;
431 }
432 return;
433 }
434 /* echo is enabled, find out if we use soft or hardware */
435 dsp->echo.software = dsp->tx_data;
436 dsp->echo.hardware = 0;
437 /* ECHO: already echo */
438 if (dsp->pcm_slot_tx >= 0 && dsp->pcm_slot_rx < 0 &&
439 dsp->pcm_bank_tx == 2 && dsp->pcm_bank_rx == 2) {
440 dsp->echo.hardware = 1;
441 return;
442 }
443 /* ECHO: if slot already assigned */
444 if (dsp->pcm_slot_tx >= 0) {
445 dsp->pcm_slot_rx = dsp->pcm_slot_tx;
446 dsp->pcm_bank_tx = 2; /* 2 means loop */
447 dsp->pcm_bank_rx = 2;
448 if (dsp_debug & DEBUG_DSP_CMX)
449 printk(KERN_DEBUG
450 "%s refresh %s for echo using slot %d\n",
451 __func__, dsp->name,
452 dsp->pcm_slot_tx);
453 dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_PCM_CONN,
454 dsp->pcm_slot_tx, 2, dsp->pcm_slot_rx, 2);
455 dsp->echo.hardware = 1;
456 return;
457 }
458 /* ECHO: find slot */
459 dsp->pcm_slot_tx = -1;
460 dsp->pcm_slot_rx = -1;
461 memset(freeslots, 1, sizeof(freeslots));
462 list_for_each_entry(finddsp, &dsp_ilist, list) {
463 if (finddsp->features.pcm_id == dsp->features.pcm_id) {
464 if (finddsp->pcm_slot_rx >= 0 &&
465 finddsp->pcm_slot_rx < sizeof(freeslots))
466 freeslots[finddsp->pcm_slot_rx] = 0;
467 if (finddsp->pcm_slot_tx >= 0 &&
468 finddsp->pcm_slot_tx < sizeof(freeslots))
469 freeslots[finddsp->pcm_slot_tx] = 0;
470 }
471 }
472 i = 0;
473 ii = dsp->features.pcm_slots;
474 while (i < ii) {
475 if (freeslots[i])
476 break;
477 i++;
478 }
479 if (i == ii) {
480 if (dsp_debug & DEBUG_DSP_CMX)
481 printk(KERN_DEBUG
482 "%s no slot available for echo\n",
483 __func__);
484 /* no more slots available */
485 dsp->echo.software = 1;
486 return;
487 }
488 /* assign free slot */
489 dsp->pcm_slot_tx = i;
490 dsp->pcm_slot_rx = i;
491 dsp->pcm_bank_tx = 2; /* loop */
492 dsp->pcm_bank_rx = 2;
493 if (dsp_debug & DEBUG_DSP_CMX)
494 printk(KERN_DEBUG
495 "%s assign echo for %s using slot %d\n",
496 __func__, dsp->name, dsp->pcm_slot_tx);
497 dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_PCM_CONN,
498 dsp->pcm_slot_tx, 2, dsp->pcm_slot_rx, 2);
499 dsp->echo.hardware = 1;
500 return;
501 }
502
503 /* conf gets updated (all members) */
504 if (dsp_debug & DEBUG_DSP_CMX)
505 printk(KERN_DEBUG "%s checking conference %d\n",
506 __func__, conf->id);
507
508 if (list_empty(&conf->mlist)) {
509 printk(KERN_ERR "%s: conference without members\n",
510 __func__);
511 return;
512 }
513 member = list_entry(conf->mlist.next, struct dsp_conf_member, list);
514 same_hfc = member->dsp->features.hfc_id;
515 same_pcm = member->dsp->features.pcm_id;
516 /* check all members in our conference */
517 list_for_each_entry(member, &conf->mlist, list) {
518 /* check if member uses mixing */
519 if (member->dsp->tx_mix) {
520 if (dsp_debug & DEBUG_DSP_CMX)
521 printk(KERN_DEBUG
522 "%s dsp %s cannot form a conf, because "
523 "tx_mix is turned on\n", __func__,
524 member->dsp->name);
525 conf_software:
526 list_for_each_entry(member, &conf->mlist, list) {
527 dsp = member->dsp;
528 /* remove HFC conference if enabled */
529 if (dsp->hfc_conf >= 0) {
530 if (dsp_debug & DEBUG_DSP_CMX)
531 printk(KERN_DEBUG
532 "%s removing %s from HFC "
533 "conf %d because not "
534 "possible with hardware\n",
535 __func__,
536 dsp->name,
537 dsp->hfc_conf);
538 dsp_cmx_hw_message(dsp,
539 MISDN_CTRL_HFC_CONF_SPLIT,
540 0, 0, 0, 0);
541 dsp->hfc_conf = -1;
542 }
543 /* remove PCM slot if assigned */
544 if (dsp->pcm_slot_tx >= 0 ||
545 dsp->pcm_slot_rx >= 0) {
546 if (dsp_debug & DEBUG_DSP_CMX)
547 printk(KERN_DEBUG "%s removing "
548 "%s from PCM slot %d (TX)"
549 " slot %d (RX) because not"
550 " possible with hardware\n",
551 __func__,
552 dsp->name,
553 dsp->pcm_slot_tx,
554 dsp->pcm_slot_rx);
555 dsp_cmx_hw_message(dsp,
556 MISDN_CTRL_HFC_PCM_DISC,
557 0, 0, 0, 0);
558 dsp->pcm_slot_tx = -1;
559 dsp->pcm_bank_tx = -1;
560 dsp->pcm_slot_rx = -1;
561 dsp->pcm_bank_rx = -1;
562 }
563 }
564 conf->hardware = 0;
565 conf->software = 1;
566 return;
567 }
568 /* check if member has echo turned on */
569 if (member->dsp->echo.hardware || member->dsp->echo.software) {
570 if (dsp_debug & DEBUG_DSP_CMX)
571 printk(KERN_DEBUG
572 "%s dsp %s cannot form a conf, because "
573 "echo is turned on\n", __func__,
574 member->dsp->name);
575 goto conf_software;
576 }
577 /* check if member has tx_mix turned on */
578 if (member->dsp->tx_mix) {
579 if (dsp_debug & DEBUG_DSP_CMX)
580 printk(KERN_DEBUG
581 "%s dsp %s cannot form a conf, because "
582 "tx_mix is turned on\n",
583 __func__, member->dsp->name);
584 goto conf_software;
585 }
586 /* check if member changes volume at an not suppoted level */
587 if (member->dsp->tx_volume) {
588 if (dsp_debug & DEBUG_DSP_CMX)
589 printk(KERN_DEBUG
590 "%s dsp %s cannot form a conf, because "
591 "tx_volume is changed\n",
592 __func__, member->dsp->name);
593 goto conf_software;
594 }
595 if (member->dsp->rx_volume) {
596 if (dsp_debug & DEBUG_DSP_CMX)
597 printk(KERN_DEBUG
598 "%s dsp %s cannot form a conf, because "
599 "rx_volume is changed\n",
600 __func__, member->dsp->name);
601 goto conf_software;
602 }
603 /* check if tx-data turned on */
604 if (member->dsp->tx_data) {
605 if (dsp_debug & DEBUG_DSP_CMX)
606 printk(KERN_DEBUG
607 "%s dsp %s tx_data is turned on\n",
608 __func__, member->dsp->name);
609 tx_data = 1;
610 }
611 /* check if pipeline exists */
612 if (member->dsp->pipeline.inuse) {
613 if (dsp_debug & DEBUG_DSP_CMX)
614 printk(KERN_DEBUG
615 "%s dsp %s cannot form a conf, because "
616 "pipeline exists\n", __func__,
617 member->dsp->name);
618 goto conf_software;
619 }
620 /* check if encryption is enabled */
621 if (member->dsp->bf_enable) {
622 if (dsp_debug & DEBUG_DSP_CMX)
623 printk(KERN_DEBUG "%s dsp %s cannot form a "
624 "conf, because encryption is enabled\n",
625 __func__, member->dsp->name);
626 goto conf_software;
627 }
628 /* check if member is on a card with PCM support */
629 if (member->dsp->features.pcm_id < 0) {
630 if (dsp_debug & DEBUG_DSP_CMX)
631 printk(KERN_DEBUG
632 "%s dsp %s cannot form a conf, because "
633 "dsp has no PCM bus\n",
634 __func__, member->dsp->name);
635 goto conf_software;
636 }
637 /* check if relations are on the same PCM bus */
638 if (member->dsp->features.pcm_id != same_pcm) {
639 if (dsp_debug & DEBUG_DSP_CMX)
640 printk(KERN_DEBUG
641 "%s dsp %s cannot form a conf, because "
642 "dsp is on a different PCM bus than the "
643 "first dsp\n",
644 __func__, member->dsp->name);
645 goto conf_software;
646 }
647 /* determine if members are on the same hfc chip */
648 if (same_hfc != member->dsp->features.hfc_id)
649 same_hfc = -1;
650 /* if there are members already in a conference */
651 if (current_conf < 0 && member->dsp->hfc_conf >= 0)
652 current_conf = member->dsp->hfc_conf;
653 /* if any member is not in a conference */
654 if (member->dsp->hfc_conf < 0)
655 all_conf = 0;
656
657 memb++;
658 }
659
660 /* if no member, this is an error */
661 if (memb < 1)
662 return;
663
664 /* one member */
665 if (memb == 1) {
666 if (dsp_debug & DEBUG_DSP_CMX)
667 printk(KERN_DEBUG
668 "%s conf %d cannot form a HW conference, "
669 "because dsp is alone\n", __func__, conf->id);
670 conf->hardware = 0;
671 conf->software = 0;
672 member = list_entry(conf->mlist.next, struct dsp_conf_member,
673 list);
674 dsp = member->dsp;
675 goto one_member;
676 }
677
678 /*
679 * ok, now we are sure that all members are on the same pcm.
680 * now we will see if we have only two members, so we can do
681 * crossconnections, which don't have any limitations.
682 */
683
684 /* if we have only two members */
685 if (memb == 2) {
686 member = list_entry(conf->mlist.next, struct dsp_conf_member,
687 list);
688 nextm = list_entry(member->list.next, struct dsp_conf_member,
689 list);
690 /* remove HFC conference if enabled */
691 if (member->dsp->hfc_conf >= 0) {
692 if (dsp_debug & DEBUG_DSP_CMX)
693 printk(KERN_DEBUG
694 "%s removing %s from HFC conf %d because "
695 "two parties require only a PCM slot\n",
696 __func__, member->dsp->name,
697 member->dsp->hfc_conf);
698 dsp_cmx_hw_message(member->dsp,
699 MISDN_CTRL_HFC_CONF_SPLIT, 0, 0, 0, 0);
700 member->dsp->hfc_conf = -1;
701 }
702 if (nextm->dsp->hfc_conf >= 0) {
703 if (dsp_debug & DEBUG_DSP_CMX)
704 printk(KERN_DEBUG
705 "%s removing %s from HFC conf %d because "
706 "two parties require only a PCM slot\n",
707 __func__, nextm->dsp->name,
708 nextm->dsp->hfc_conf);
709 dsp_cmx_hw_message(nextm->dsp,
710 MISDN_CTRL_HFC_CONF_SPLIT, 0, 0, 0, 0);
711 nextm->dsp->hfc_conf = -1;
712 }
713 /* if members have two banks (and not on the same chip) */
714 if (member->dsp->features.pcm_banks > 1 &&
715 nextm->dsp->features.pcm_banks > 1 &&
716 member->dsp->features.hfc_id !=
717 nextm->dsp->features.hfc_id) {
718 /* if both members have same slots with crossed banks */
719 if (member->dsp->pcm_slot_tx >= 0 &&
720 member->dsp->pcm_slot_rx >= 0 &&
721 nextm->dsp->pcm_slot_tx >= 0 &&
722 nextm->dsp->pcm_slot_rx >= 0 &&
723 nextm->dsp->pcm_slot_tx ==
724 member->dsp->pcm_slot_rx &&
725 nextm->dsp->pcm_slot_rx ==
726 member->dsp->pcm_slot_tx &&
727 nextm->dsp->pcm_slot_tx ==
728 member->dsp->pcm_slot_tx &&
729 member->dsp->pcm_bank_tx !=
730 member->dsp->pcm_bank_rx &&
731 nextm->dsp->pcm_bank_tx !=
732 nextm->dsp->pcm_bank_rx) {
733 /* all members have same slot */
734 if (dsp_debug & DEBUG_DSP_CMX)
735 printk(KERN_DEBUG
736 "%s dsp %s & %s stay joined on "
737 "PCM slot %d bank %d (TX) bank %d "
738 "(RX) (on different chips)\n",
739 __func__,
740 member->dsp->name,
741 nextm->dsp->name,
742 member->dsp->pcm_slot_tx,
743 member->dsp->pcm_bank_tx,
744 member->dsp->pcm_bank_rx);
745 conf->hardware = 1;
746 conf->software = tx_data;
747 return;
748 }
749 /* find a new slot */
750 memset(freeslots, 1, sizeof(freeslots));
751 list_for_each_entry(dsp, &dsp_ilist, list) {
752 if (dsp != member->dsp &&
753 dsp != nextm->dsp &&
754 member->dsp->features.pcm_id ==
755 dsp->features.pcm_id) {
756 if (dsp->pcm_slot_rx >= 0 &&
757 dsp->pcm_slot_rx <
758 sizeof(freeslots))
759 freeslots[dsp->pcm_slot_rx] = 0;
760 if (dsp->pcm_slot_tx >= 0 &&
761 dsp->pcm_slot_tx <
762 sizeof(freeslots))
763 freeslots[dsp->pcm_slot_tx] = 0;
764 }
765 }
766 i = 0;
767 ii = member->dsp->features.pcm_slots;
768 while (i < ii) {
769 if (freeslots[i])
770 break;
771 i++;
772 }
773 if (i == ii) {
774 if (dsp_debug & DEBUG_DSP_CMX)
775 printk(KERN_DEBUG
776 "%s no slot available for "
777 "%s & %s\n", __func__,
778 member->dsp->name,
779 nextm->dsp->name);
780 /* no more slots available */
781 goto conf_software;
782 }
783 /* assign free slot */
784 member->dsp->pcm_slot_tx = i;
785 member->dsp->pcm_slot_rx = i;
786 nextm->dsp->pcm_slot_tx = i;
787 nextm->dsp->pcm_slot_rx = i;
788 member->dsp->pcm_bank_rx = 0;
789 member->dsp->pcm_bank_tx = 1;
790 nextm->dsp->pcm_bank_rx = 1;
791 nextm->dsp->pcm_bank_tx = 0;
792 if (dsp_debug & DEBUG_DSP_CMX)
793 printk(KERN_DEBUG
794 "%s adding %s & %s to new PCM slot %d "
795 "(TX and RX on different chips) because "
796 "both members have not same slots\n",
797 __func__,
798 member->dsp->name,
799 nextm->dsp->name,
800 member->dsp->pcm_slot_tx);
801 dsp_cmx_hw_message(member->dsp, MISDN_CTRL_HFC_PCM_CONN,
802 member->dsp->pcm_slot_tx, member->dsp->pcm_bank_tx,
803 member->dsp->pcm_slot_rx, member->dsp->pcm_bank_rx);
804 dsp_cmx_hw_message(nextm->dsp, MISDN_CTRL_HFC_PCM_CONN,
805 nextm->dsp->pcm_slot_tx, nextm->dsp->pcm_bank_tx,
806 nextm->dsp->pcm_slot_rx, nextm->dsp->pcm_bank_rx);
807 conf->hardware = 1;
808 conf->software = tx_data;
809 return;
810 /* if members have one bank (or on the same chip) */
811 } else {
812 /* if both members have different crossed slots */
813 if (member->dsp->pcm_slot_tx >= 0 &&
814 member->dsp->pcm_slot_rx >= 0 &&
815 nextm->dsp->pcm_slot_tx >= 0 &&
816 nextm->dsp->pcm_slot_rx >= 0 &&
817 nextm->dsp->pcm_slot_tx ==
818 member->dsp->pcm_slot_rx &&
819 nextm->dsp->pcm_slot_rx ==
820 member->dsp->pcm_slot_tx &&
821 member->dsp->pcm_slot_tx !=
822 member->dsp->pcm_slot_rx &&
823 member->dsp->pcm_bank_tx == 0 &&
824 member->dsp->pcm_bank_rx == 0 &&
825 nextm->dsp->pcm_bank_tx == 0 &&
826 nextm->dsp->pcm_bank_rx == 0) {
827 /* all members have same slot */
828 if (dsp_debug & DEBUG_DSP_CMX)
829 printk(KERN_DEBUG
830 "%s dsp %s & %s stay joined on PCM "
831 "slot %d (TX) %d (RX) on same chip "
832 "or one bank PCM)\n", __func__,
833 member->dsp->name,
834 nextm->dsp->name,
835 member->dsp->pcm_slot_tx,
836 member->dsp->pcm_slot_rx);
837 conf->hardware = 1;
838 conf->software = tx_data;
839 return;
840 }
841 /* find two new slot */
842 memset(freeslots, 1, sizeof(freeslots));
843 list_for_each_entry(dsp, &dsp_ilist, list) {
844 if (dsp != member->dsp &&
845 dsp != nextm->dsp &&
846 member->dsp->features.pcm_id ==
847 dsp->features.pcm_id) {
848 if (dsp->pcm_slot_rx >= 0 &&
849 dsp->pcm_slot_rx <
850 sizeof(freeslots))
851 freeslots[dsp->pcm_slot_rx] = 0;
852 if (dsp->pcm_slot_tx >= 0 &&
853 dsp->pcm_slot_tx <
854 sizeof(freeslots))
855 freeslots[dsp->pcm_slot_tx] = 0;
856 }
857 }
858 i1 = 0;
859 ii = member->dsp->features.pcm_slots;
860 while (i1 < ii) {
861 if (freeslots[i1])
862 break;
863 i1++;
864 }
865 if (i1 == ii) {
866 if (dsp_debug & DEBUG_DSP_CMX)
867 printk(KERN_DEBUG
868 "%s no slot available "
869 "for %s & %s\n", __func__,
870 member->dsp->name,
871 nextm->dsp->name);
872 /* no more slots available */
873 goto conf_software;
874 }
875 i2 = i1 + 1;
876 while (i2 < ii) {
877 if (freeslots[i2])
878 break;
879 i2++;
880 }
881 if (i2 == ii) {
882 if (dsp_debug & DEBUG_DSP_CMX)
883 printk(KERN_DEBUG
884 "%s no slot available "
885 "for %s & %s\n",
886 __func__,
887 member->dsp->name,
888 nextm->dsp->name);
889 /* no more slots available */
890 goto conf_software;
891 }
892 /* assign free slots */
893 member->dsp->pcm_slot_tx = i1;
894 member->dsp->pcm_slot_rx = i2;
895 nextm->dsp->pcm_slot_tx = i2;
896 nextm->dsp->pcm_slot_rx = i1;
897 member->dsp->pcm_bank_rx = 0;
898 member->dsp->pcm_bank_tx = 0;
899 nextm->dsp->pcm_bank_rx = 0;
900 nextm->dsp->pcm_bank_tx = 0;
901 if (dsp_debug & DEBUG_DSP_CMX)
902 printk(KERN_DEBUG
903 "%s adding %s & %s to new PCM slot %d "
904 "(TX) %d (RX) on same chip or one bank "
905 "PCM, because both members have not "
906 "crossed slots\n", __func__,
907 member->dsp->name,
908 nextm->dsp->name,
909 member->dsp->pcm_slot_tx,
910 member->dsp->pcm_slot_rx);
911 dsp_cmx_hw_message(member->dsp, MISDN_CTRL_HFC_PCM_CONN,
912 member->dsp->pcm_slot_tx, member->dsp->pcm_bank_tx,
913 member->dsp->pcm_slot_rx, member->dsp->pcm_bank_rx);
914 dsp_cmx_hw_message(nextm->dsp, MISDN_CTRL_HFC_PCM_CONN,
915 nextm->dsp->pcm_slot_tx, nextm->dsp->pcm_bank_tx,
916 nextm->dsp->pcm_slot_rx, nextm->dsp->pcm_bank_rx);
917 conf->hardware = 1;
918 conf->software = tx_data;
919 return;
920 }
921 }
922
923 /*
924 * if we have more than two, we may check if we have a conference
925 * unit available on the chip. also all members must be on the same
926 */
927
928 /* if not the same HFC chip */
929 if (same_hfc < 0) {
930 if (dsp_debug & DEBUG_DSP_CMX)
931 printk(KERN_DEBUG
932 "%s conference %d cannot be formed, because "
933 "members are on different chips or not "
934 "on HFC chip\n",
935 __func__, conf->id);
936 goto conf_software;
937 }
938
939 /* for more than two members.. */
940
941 /* if all members already have the same conference */
942 if (all_conf) {
943 conf->hardware = 1;
944 conf->software = tx_data;
945 return;
946 }
947
948 /*
949 * if there is an existing conference, but not all members have joined
950 */
951 if (current_conf >= 0) {
952 join_members:
953 list_for_each_entry(member, &conf->mlist, list) {
954 /* if no conference engine on our chip, change to
955 * software */
956 if (!member->dsp->features.hfc_conf)
957 goto conf_software;
958 /* in case of hdlc, change to software */
959 if (member->dsp->hdlc)
960 goto conf_software;
961 /* join to current conference */
962 if (member->dsp->hfc_conf == current_conf)
963 continue;
964 /* get a free timeslot first */
965 memset(freeslots, 1, sizeof(freeslots));
966 list_for_each_entry(dsp, &dsp_ilist, list) {
967 /*
968 * not checking current member, because
969 * slot will be overwritten.
970 */
971 if (
972 dsp != member->dsp &&
973 /* dsp must be on the same PCM */
974 member->dsp->features.pcm_id ==
975 dsp->features.pcm_id) {
976 /* dsp must be on a slot */
977 if (dsp->pcm_slot_tx >= 0 &&
978 dsp->pcm_slot_tx <
979 sizeof(freeslots))
980 freeslots[dsp->pcm_slot_tx] = 0;
981 if (dsp->pcm_slot_rx >= 0 &&
982 dsp->pcm_slot_rx <
983 sizeof(freeslots))
984 freeslots[dsp->pcm_slot_rx] = 0;
985 }
986 }
987 i = 0;
988 ii = member->dsp->features.pcm_slots;
989 while (i < ii) {
990 if (freeslots[i])
991 break;
992 i++;
993 }
994 if (i == ii) {
995 /* no more slots available */
996 if (dsp_debug & DEBUG_DSP_CMX)
997 printk(KERN_DEBUG
998 "%s conference %d cannot be formed,"
999 " because no slot free\n",
1000 __func__, conf->id);
1001 goto conf_software;
1002 }
1003 if (dsp_debug & DEBUG_DSP_CMX)
1004 printk(KERN_DEBUG
1005 "%s changing dsp %s to HW conference "
1006 "%d slot %d\n", __func__,
1007 member->dsp->name, current_conf, i);
1008 /* assign free slot & set PCM & join conf */
1009 member->dsp->pcm_slot_tx = i;
1010 member->dsp->pcm_slot_rx = i;
1011 member->dsp->pcm_bank_tx = 2; /* loop */
1012 member->dsp->pcm_bank_rx = 2;
1013 member->dsp->hfc_conf = current_conf;
1014 dsp_cmx_hw_message(member->dsp, MISDN_CTRL_HFC_PCM_CONN,
1015 i, 2, i, 2);
1016 dsp_cmx_hw_message(member->dsp,
1017 MISDN_CTRL_HFC_CONF_JOIN, current_conf, 0, 0, 0);
1018 }
1019 conf->hardware = 1;
1020 conf->software = tx_data;
1021 return;
1022 }
1023
1024 /*
1025 * no member is in a conference yet, so we find a free one
1026 */
1027 memset(freeunits, 1, sizeof(freeunits));
1028 list_for_each_entry(dsp, &dsp_ilist, list) {
1029 /* dsp must be on the same chip */
1030 if (dsp->features.hfc_id == same_hfc &&
1031 /* dsp must have joined a HW conference */
1032 dsp->hfc_conf >= 0 &&
1033 /* slot must be within range */
1034 dsp->hfc_conf < 8)
1035 freeunits[dsp->hfc_conf] = 0;
1036 }
1037 i = 0;
1038 ii = 8;
1039 while (i < ii) {
1040 if (freeunits[i])
1041 break;
1042 i++;
1043 }
1044 if (i == ii) {
1045 /* no more conferences available */
1046 if (dsp_debug & DEBUG_DSP_CMX)
1047 printk(KERN_DEBUG
1048 "%s conference %d cannot be formed, because "
1049 "no conference number free\n",
1050 __func__, conf->id);
1051 goto conf_software;
1052 }
1053 /* join all members */
1054 current_conf = i;
1055 goto join_members;
1056 }
1057
1058
1059 /*
1060 * conf_id != 0: join or change conference
1061 * conf_id == 0: split from conference if not already
1062 */
1063 int
dsp_cmx_conf(struct dsp * dsp,u32 conf_id)1064 dsp_cmx_conf(struct dsp *dsp, u32 conf_id)
1065 {
1066 int err;
1067 struct dsp_conf *conf;
1068 struct dsp_conf_member *member;
1069
1070 /* if conference doesn't change */
1071 if (dsp->conf_id == conf_id)
1072 return 0;
1073
1074 /* first remove us from current conf */
1075 if (dsp->conf_id) {
1076 if (dsp_debug & DEBUG_DSP_CMX)
1077 printk(KERN_DEBUG "removing us from conference %d\n",
1078 dsp->conf->id);
1079 /* remove us from conf */
1080 conf = dsp->conf;
1081 err = dsp_cmx_del_conf_member(dsp);
1082 if (err)
1083 return err;
1084 dsp->conf_id = 0;
1085
1086 /* update hardware */
1087 dsp_cmx_hardware(NULL, dsp);
1088
1089 /* conf now empty? */
1090 if (list_empty(&conf->mlist)) {
1091 if (dsp_debug & DEBUG_DSP_CMX)
1092 printk(KERN_DEBUG
1093 "conference is empty, so we remove it.\n");
1094 err = dsp_cmx_del_conf(conf);
1095 if (err)
1096 return err;
1097 } else {
1098 /* update members left on conf */
1099 dsp_cmx_hardware(conf, NULL);
1100 }
1101 }
1102
1103 /* if split */
1104 if (!conf_id)
1105 return 0;
1106
1107 /* now add us to conf */
1108 if (dsp_debug & DEBUG_DSP_CMX)
1109 printk(KERN_DEBUG "searching conference %d\n",
1110 conf_id);
1111 conf = dsp_cmx_search_conf(conf_id);
1112 if (!conf) {
1113 if (dsp_debug & DEBUG_DSP_CMX)
1114 printk(KERN_DEBUG
1115 "conference doesn't exist yet, creating.\n");
1116 /* the conference doesn't exist, so we create */
1117 conf = dsp_cmx_new_conf(conf_id);
1118 if (!conf)
1119 return -EINVAL;
1120 } else if (!list_empty(&conf->mlist)) {
1121 member = list_entry(conf->mlist.next, struct dsp_conf_member,
1122 list);
1123 if (dsp->hdlc && !member->dsp->hdlc) {
1124 if (dsp_debug & DEBUG_DSP_CMX)
1125 printk(KERN_DEBUG
1126 "cannot join transparent conference.\n");
1127 return -EINVAL;
1128 }
1129 if (!dsp->hdlc && member->dsp->hdlc) {
1130 if (dsp_debug & DEBUG_DSP_CMX)
1131 printk(KERN_DEBUG
1132 "cannot join hdlc conference.\n");
1133 return -EINVAL;
1134 }
1135 }
1136 /* add conference member */
1137 err = dsp_cmx_add_conf_member(dsp, conf);
1138 if (err)
1139 return err;
1140 dsp->conf_id = conf_id;
1141
1142 /* if we are alone, we do nothing! */
1143 if (list_empty(&conf->mlist)) {
1144 if (dsp_debug & DEBUG_DSP_CMX)
1145 printk(KERN_DEBUG
1146 "we are alone in this conference, so exit.\n");
1147 /* update hardware */
1148 dsp_cmx_hardware(NULL, dsp);
1149 return 0;
1150 }
1151
1152 /* update members on conf */
1153 dsp_cmx_hardware(conf, NULL);
1154
1155 return 0;
1156 }
1157
1158 #ifdef CMX_DELAY_DEBUG
1159 int delaycount;
1160 static void
showdelay(struct dsp * dsp,int samples,int delay)1161 showdelay(struct dsp *dsp, int samples, int delay)
1162 {
1163 char bar[] = "--------------------------------------------------|";
1164 int sdelay;
1165
1166 delaycount += samples;
1167 if (delaycount < 8000)
1168 return;
1169 delaycount = 0;
1170
1171 sdelay = delay * 50 / (dsp_poll << 2);
1172
1173 printk(KERN_DEBUG "DELAY (%s) %3d >%s\n", dsp->name, delay,
1174 sdelay > 50 ? "..." : bar + 50 - sdelay);
1175 }
1176 #endif
1177
1178 /*
1179 * audio data is received from card
1180 */
1181 void
dsp_cmx_receive(struct dsp * dsp,struct sk_buff * skb)1182 dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb)
1183 {
1184 u8 *d, *p;
1185 int len = skb->len;
1186 struct mISDNhead *hh = mISDN_HEAD_P(skb);
1187 int w, i, ii;
1188
1189 /* check if we have sompen */
1190 if (len < 1)
1191 return;
1192
1193 /* half of the buffer should be larger than maximum packet size */
1194 if (len >= CMX_BUFF_HALF) {
1195 printk(KERN_ERR
1196 "%s line %d: packet from card is too large (%d bytes). "
1197 "please make card send smaller packets OR increase "
1198 "CMX_BUFF_SIZE\n", __FILE__, __LINE__, len);
1199 return;
1200 }
1201
1202 /*
1203 * initialize pointers if not already -
1204 * also add delay if requested by PH_SIGNAL
1205 */
1206 if (dsp->rx_init) {
1207 dsp->rx_init = 0;
1208 if (dsp->features.unordered) {
1209 dsp->rx_R = (hh->id & CMX_BUFF_MASK);
1210 if (dsp->cmx_delay)
1211 dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
1212 & CMX_BUFF_MASK;
1213 else
1214 dsp->rx_W = (dsp->rx_R + (dsp_poll >> 1))
1215 & CMX_BUFF_MASK;
1216 } else {
1217 dsp->rx_R = 0;
1218 if (dsp->cmx_delay)
1219 dsp->rx_W = dsp->cmx_delay;
1220 else
1221 dsp->rx_W = dsp_poll >> 1;
1222 }
1223 }
1224 /* if frame contains time code, write directly */
1225 if (dsp->features.unordered) {
1226 dsp->rx_W = (hh->id & CMX_BUFF_MASK);
1227 /* printk(KERN_DEBUG "%s %08x\n", dsp->name, hh->id); */
1228 }
1229 /*
1230 * if we underrun (or maybe overrun),
1231 * we set our new read pointer, and write silence to buffer
1232 */
1233 if (((dsp->rx_W-dsp->rx_R) & CMX_BUFF_MASK) >= CMX_BUFF_HALF) {
1234 if (dsp_debug & DEBUG_DSP_CLOCK)
1235 printk(KERN_DEBUG
1236 "cmx_receive(dsp=%lx): UNDERRUN (or overrun the "
1237 "maximum delay), adjusting read pointer! "
1238 "(inst %s)\n", (u_long)dsp, dsp->name);
1239 /* flush rx buffer and set delay to dsp_poll / 2 */
1240 if (dsp->features.unordered) {
1241 dsp->rx_R = (hh->id & CMX_BUFF_MASK);
1242 if (dsp->cmx_delay)
1243 dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
1244 & CMX_BUFF_MASK;
1245 else
1246 dsp->rx_W = (dsp->rx_R + (dsp_poll >> 1))
1247 & CMX_BUFF_MASK;
1248 } else {
1249 dsp->rx_R = 0;
1250 if (dsp->cmx_delay)
1251 dsp->rx_W = dsp->cmx_delay;
1252 else
1253 dsp->rx_W = dsp_poll >> 1;
1254 }
1255 memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
1256 }
1257 /* if we have reached double delay, jump back to middle */
1258 if (dsp->cmx_delay)
1259 if (((dsp->rx_W - dsp->rx_R) & CMX_BUFF_MASK) >=
1260 (dsp->cmx_delay << 1)) {
1261 if (dsp_debug & DEBUG_DSP_CLOCK)
1262 printk(KERN_DEBUG
1263 "cmx_receive(dsp=%lx): OVERRUN (because "
1264 "twice the delay is reached), adjusting "
1265 "read pointer! (inst %s)\n",
1266 (u_long)dsp, dsp->name);
1267 /* flush buffer */
1268 if (dsp->features.unordered) {
1269 dsp->rx_R = (hh->id & CMX_BUFF_MASK);
1270 dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
1271 & CMX_BUFF_MASK;
1272 } else {
1273 dsp->rx_R = 0;
1274 dsp->rx_W = dsp->cmx_delay;
1275 }
1276 memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
1277 }
1278
1279 /* show where to write */
1280 #ifdef CMX_DEBUG
1281 printk(KERN_DEBUG
1282 "cmx_receive(dsp=%lx): rx_R(dsp)=%05x rx_W(dsp)=%05x len=%d %s\n",
1283 (u_long)dsp, dsp->rx_R, dsp->rx_W, len, dsp->name);
1284 #endif
1285
1286 /* write data into rx_buffer */
1287 p = skb->data;
1288 d = dsp->rx_buff;
1289 w = dsp->rx_W;
1290 i = 0;
1291 ii = len;
1292 while (i < ii) {
1293 d[w++ & CMX_BUFF_MASK] = *p++;
1294 i++;
1295 }
1296
1297 /* increase write-pointer */
1298 dsp->rx_W = ((dsp->rx_W + len) & CMX_BUFF_MASK);
1299 #ifdef CMX_DELAY_DEBUG
1300 showdelay(dsp, len, (dsp->rx_W-dsp->rx_R) & CMX_BUFF_MASK);
1301 #endif
1302 }
1303
1304
1305 /*
1306 * send (mixed) audio data to card and control jitter
1307 */
1308 static void
dsp_cmx_send_member(struct dsp * dsp,int len,s32 * c,int members)1309 dsp_cmx_send_member(struct dsp *dsp, int len, s32 *c, int members)
1310 {
1311 struct dsp_conf *conf = dsp->conf;
1312 struct dsp *member, *other;
1313 register s32 sample;
1314 u8 *d, *p, *q, *o_q;
1315 struct sk_buff *nskb, *txskb;
1316 int r, rr, t, tt, o_r, o_rr;
1317 int preload = 0;
1318 struct mISDNhead *hh, *thh;
1319 int tx_data_only = 0;
1320
1321 /* don't process if: */
1322 if (!dsp->b_active) { /* if not active */
1323 dsp->last_tx = 0;
1324 return;
1325 }
1326 if (((dsp->conf && dsp->conf->hardware) || /* hardware conf */
1327 dsp->echo.hardware) && /* OR hardware echo */
1328 dsp->tx_R == dsp->tx_W && /* AND no tx-data */
1329 !(dsp->tone.tone && dsp->tone.software)) { /* AND not soft tones */
1330 if (!dsp->tx_data) { /* no tx_data for user space required */
1331 dsp->last_tx = 0;
1332 return;
1333 }
1334 if (dsp->conf && dsp->conf->software && dsp->conf->hardware)
1335 tx_data_only = 1;
1336 if (dsp->echo.software && dsp->echo.hardware)
1337 tx_data_only = 1;
1338 }
1339
1340 #ifdef CMX_DEBUG
1341 printk(KERN_DEBUG
1342 "SEND members=%d dsp=%s, conf=%p, rx_R=%05x rx_W=%05x\n",
1343 members, dsp->name, conf, dsp->rx_R, dsp->rx_W);
1344 #endif
1345
1346 /* preload if we have delay set */
1347 if (dsp->cmx_delay && !dsp->last_tx) {
1348 preload = len;
1349 if (preload < 128)
1350 preload = 128;
1351 }
1352
1353 /* PREPARE RESULT */
1354 nskb = mI_alloc_skb(len + preload, GFP_ATOMIC);
1355 if (!nskb) {
1356 printk(KERN_ERR
1357 "FATAL ERROR in mISDN_dsp.o: cannot alloc %d bytes\n",
1358 len + preload);
1359 return;
1360 }
1361 hh = mISDN_HEAD_P(nskb);
1362 hh->prim = PH_DATA_REQ;
1363 hh->id = 0;
1364 dsp->last_tx = 1;
1365
1366 /* set pointers, indexes and stuff */
1367 member = dsp;
1368 p = dsp->tx_buff; /* transmit data */
1369 q = dsp->rx_buff; /* received data */
1370 d = skb_put(nskb, preload + len); /* result */
1371 t = dsp->tx_R; /* tx-pointers */
1372 tt = dsp->tx_W;
1373 r = dsp->rx_R; /* rx-pointers */
1374 rr = (r + len) & CMX_BUFF_MASK;
1375
1376 /* preload with silence, if required */
1377 if (preload) {
1378 memset(d, dsp_silence, preload);
1379 d += preload;
1380 }
1381
1382 /* PROCESS TONES/TX-DATA ONLY */
1383 if (dsp->tone.tone && dsp->tone.software) {
1384 /* -> copy tone */
1385 dsp_tone_copy(dsp, d, len);
1386 dsp->tx_R = 0; /* clear tx buffer */
1387 dsp->tx_W = 0;
1388 goto send_packet;
1389 }
1390 /* if we have tx-data but do not use mixing */
1391 if (!dsp->tx_mix && t != tt) {
1392 /* -> send tx-data and continue when not enough */
1393 #ifdef CMX_TX_DEBUG
1394 sprintf(debugbuf, "TX sending (%04x-%04x)%p: ", t, tt, p);
1395 #endif
1396 while (r != rr && t != tt) {
1397 #ifdef CMX_TX_DEBUG
1398 if (strlen(debugbuf) < 48)
1399 sprintf(debugbuf + strlen(debugbuf), " %02x",
1400 p[t]);
1401 #endif
1402 *d++ = p[t]; /* write tx_buff */
1403 t = (t + 1) & CMX_BUFF_MASK;
1404 r = (r + 1) & CMX_BUFF_MASK;
1405 }
1406 if (r == rr) {
1407 dsp->tx_R = t;
1408 #ifdef CMX_TX_DEBUG
1409 printk(KERN_DEBUG "%s\n", debugbuf);
1410 #endif
1411 goto send_packet;
1412 }
1413 }
1414 #ifdef CMX_TX_DEBUG
1415 printk(KERN_DEBUG "%s\n", debugbuf);
1416 #endif
1417
1418 /* PROCESS DATA (one member / no conf) */
1419 if (!conf || members <= 1) {
1420 /* -> if echo is NOT enabled */
1421 if (!dsp->echo.software) {
1422 /* -> send tx-data if available or use 0-volume */
1423 while (r != rr && t != tt) {
1424 *d++ = p[t]; /* write tx_buff */
1425 t = (t + 1) & CMX_BUFF_MASK;
1426 r = (r + 1) & CMX_BUFF_MASK;
1427 }
1428 if (r != rr) {
1429 if (dsp_debug & DEBUG_DSP_CLOCK)
1430 printk(KERN_DEBUG "%s: RX empty\n",
1431 __func__);
1432 memset(d, dsp_silence, (rr - r) & CMX_BUFF_MASK);
1433 }
1434 /* -> if echo is enabled */
1435 } else {
1436 /*
1437 * -> mix tx-data with echo if available,
1438 * or use echo only
1439 */
1440 while (r != rr && t != tt) {
1441 *d++ = dsp_audio_mix_law[(p[t] << 8) | q[r]];
1442 t = (t + 1) & CMX_BUFF_MASK;
1443 r = (r + 1) & CMX_BUFF_MASK;
1444 }
1445 while (r != rr) {
1446 *d++ = q[r]; /* echo */
1447 r = (r + 1) & CMX_BUFF_MASK;
1448 }
1449 }
1450 dsp->tx_R = t;
1451 goto send_packet;
1452 }
1453 /* PROCESS DATA (two members) */
1454 #ifdef CMX_CONF_DEBUG
1455 if (0) {
1456 #else
1457 if (members == 2) {
1458 #endif
1459 /* "other" becomes other party */
1460 other = (list_entry(conf->mlist.next,
1461 struct dsp_conf_member, list))->dsp;
1462 if (other == member)
1463 other = (list_entry(conf->mlist.prev,
1464 struct dsp_conf_member, list))->dsp;
1465 o_q = other->rx_buff; /* received data */
1466 o_rr = (other->rx_R + len) & CMX_BUFF_MASK;
1467 /* end of rx-pointer */
1468 o_r = (o_rr - rr + r) & CMX_BUFF_MASK;
1469 /* start rx-pointer at current read position*/
1470 /* -> if echo is NOT enabled */
1471 if (!dsp->echo.software) {
1472 /*
1473 * -> copy other member's rx-data,
1474 * if tx-data is available, mix
1475 */
1476 while (o_r != o_rr && t != tt) {
1477 *d++ = dsp_audio_mix_law[(p[t] << 8) | o_q[o_r]];
1478 t = (t + 1) & CMX_BUFF_MASK;
1479 o_r = (o_r + 1) & CMX_BUFF_MASK;
1480 }
1481 while (o_r != o_rr) {
1482 *d++ = o_q[o_r];
1483 o_r = (o_r + 1) & CMX_BUFF_MASK;
1484 }
1485 /* -> if echo is enabled */
1486 } else {
1487 /*
1488 * -> mix other member's rx-data with echo,
1489 * if tx-data is available, mix
1490 */
1491 while (r != rr && t != tt) {
1492 sample = dsp_audio_law_to_s32[p[t]] +
1493 dsp_audio_law_to_s32[q[r]] +
1494 dsp_audio_law_to_s32[o_q[o_r]];
1495 if (sample < -32768)
1496 sample = -32768;
1497 else if (sample > 32767)
1498 sample = 32767;
1499 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1500 /* tx-data + rx_data + echo */
1501 t = (t + 1) & CMX_BUFF_MASK;
1502 r = (r + 1) & CMX_BUFF_MASK;
1503 o_r = (o_r + 1) & CMX_BUFF_MASK;
1504 }
1505 while (r != rr) {
1506 *d++ = dsp_audio_mix_law[(q[r] << 8) | o_q[o_r]];
1507 r = (r + 1) & CMX_BUFF_MASK;
1508 o_r = (o_r + 1) & CMX_BUFF_MASK;
1509 }
1510 }
1511 dsp->tx_R = t;
1512 goto send_packet;
1513 }
1514 /* PROCESS DATA (three or more members) */
1515 /* -> if echo is NOT enabled */
1516 if (!dsp->echo.software) {
1517 /*
1518 * -> subtract rx-data from conf-data,
1519 * if tx-data is available, mix
1520 */
1521 while (r != rr && t != tt) {
1522 sample = dsp_audio_law_to_s32[p[t]] + *c++ -
1523 dsp_audio_law_to_s32[q[r]];
1524 if (sample < -32768)
1525 sample = -32768;
1526 else if (sample > 32767)
1527 sample = 32767;
1528 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1529 /* conf-rx+tx */
1530 r = (r + 1) & CMX_BUFF_MASK;
1531 t = (t + 1) & CMX_BUFF_MASK;
1532 }
1533 while (r != rr) {
1534 sample = *c++ - dsp_audio_law_to_s32[q[r]];
1535 if (sample < -32768)
1536 sample = -32768;
1537 else if (sample > 32767)
1538 sample = 32767;
1539 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1540 /* conf-rx */
1541 r = (r + 1) & CMX_BUFF_MASK;
1542 }
1543 /* -> if echo is enabled */
1544 } else {
1545 /*
1546 * -> encode conf-data, if tx-data
1547 * is available, mix
1548 */
1549 while (r != rr && t != tt) {
1550 sample = dsp_audio_law_to_s32[p[t]] + *c++;
1551 if (sample < -32768)
1552 sample = -32768;
1553 else if (sample > 32767)
1554 sample = 32767;
1555 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1556 /* conf(echo)+tx */
1557 t = (t + 1) & CMX_BUFF_MASK;
1558 r = (r + 1) & CMX_BUFF_MASK;
1559 }
1560 while (r != rr) {
1561 sample = *c++;
1562 if (sample < -32768)
1563 sample = -32768;
1564 else if (sample > 32767)
1565 sample = 32767;
1566 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1567 /* conf(echo) */
1568 r = (r + 1) & CMX_BUFF_MASK;
1569 }
1570 }
1571 dsp->tx_R = t;
1572 goto send_packet;
1573
1574 send_packet:
1575 /*
1576 * send tx-data if enabled - don't filter,
1577 * because we want what we send, not what we filtered
1578 */
1579 if (dsp->tx_data) {
1580 if (tx_data_only) {
1581 hh->prim = DL_DATA_REQ;
1582 hh->id = 0;
1583 /* queue and trigger */
1584 skb_queue_tail(&dsp->sendq, nskb);
1585 schedule_work(&dsp->workq);
1586 /* exit because only tx_data is used */
1587 return;
1588 } else {
1589 txskb = mI_alloc_skb(len, GFP_ATOMIC);
1590 if (!txskb) {
1591 printk(KERN_ERR
1592 "FATAL ERROR in mISDN_dsp.o: "
1593 "cannot alloc %d bytes\n", len);
1594 } else {
1595 thh = mISDN_HEAD_P(txskb);
1596 thh->prim = DL_DATA_REQ;
1597 thh->id = 0;
1598 memcpy(skb_put(txskb, len), nskb->data + preload,
1599 len);
1600 /* queue (trigger later) */
1601 skb_queue_tail(&dsp->sendq, txskb);
1602 }
1603 }
1604 }
1605
1606 /* send data only to card, if we don't just calculated tx_data */
1607 /* adjust volume */
1608 if (dsp->tx_volume)
1609 dsp_change_volume(nskb, dsp->tx_volume);
1610 /* pipeline */
1611 if (dsp->pipeline.inuse)
1612 dsp_pipeline_process_tx(&dsp->pipeline, nskb->data,
1613 nskb->len);
1614 /* crypt */
1615 if (dsp->bf_enable)
1616 dsp_bf_encrypt(dsp, nskb->data, nskb->len);
1617 /* queue and trigger */
1618 skb_queue_tail(&dsp->sendq, nskb);
1619 schedule_work(&dsp->workq);
1620 }
1621
1622 static u32 jittercount; /* counter for jitter check */
1623 struct timer_list dsp_spl_tl;
1624 unsigned long dsp_spl_jiffies; /* calculate the next time to fire */
1625 static u16 dsp_count; /* last sample count */
1626 static int dsp_count_valid; /* if we have last sample count */
1627
1628 void
1629 dsp_cmx_send(void *arg)
1630 {
1631 struct dsp_conf *conf;
1632 struct dsp_conf_member *member;
1633 struct dsp *dsp;
1634 int mustmix, members;
1635 static s32 mixbuffer[MAX_POLL + 100];
1636 s32 *c;
1637 u8 *p, *q;
1638 int r, rr;
1639 int jittercheck = 0, delay, i;
1640 u_long flags;
1641 u16 length, count;
1642
1643 /* lock */
1644 spin_lock_irqsave(&dsp_lock, flags);
1645
1646 if (!dsp_count_valid) {
1647 dsp_count = mISDN_clock_get();
1648 length = dsp_poll;
1649 dsp_count_valid = 1;
1650 } else {
1651 count = mISDN_clock_get();
1652 length = count - dsp_count;
1653 dsp_count = count;
1654 }
1655 if (length > MAX_POLL + 100)
1656 length = MAX_POLL + 100;
1657 /* printk(KERN_DEBUG "len=%d dsp_count=0x%x\n", length, dsp_count); */
1658
1659 /*
1660 * check if jitter needs to be checked (this is every second)
1661 */
1662 jittercount += length;
1663 if (jittercount >= 8000) {
1664 jittercount -= 8000;
1665 jittercheck = 1;
1666 }
1667
1668 /* loop all members that do not require conference mixing */
1669 list_for_each_entry(dsp, &dsp_ilist, list) {
1670 if (dsp->hdlc)
1671 continue;
1672 conf = dsp->conf;
1673 mustmix = 0;
1674 members = 0;
1675 if (conf) {
1676 members = count_list_member(&conf->mlist);
1677 #ifdef CMX_CONF_DEBUG
1678 if (conf->software && members > 1)
1679 #else
1680 if (conf->software && members > 2)
1681 #endif
1682 mustmix = 1;
1683 }
1684
1685 /* transmission required */
1686 if (!mustmix) {
1687 dsp_cmx_send_member(dsp, length, mixbuffer, members);
1688
1689 /*
1690 * unused mixbuffer is given to prevent a
1691 * potential null-pointer-bug
1692 */
1693 }
1694 }
1695
1696 /* loop all members that require conference mixing */
1697 list_for_each_entry(conf, &conf_ilist, list) {
1698 /* count members and check hardware */
1699 members = count_list_member(&conf->mlist);
1700 #ifdef CMX_CONF_DEBUG
1701 if (conf->software && members > 1) {
1702 #else
1703 if (conf->software && members > 2) {
1704 #endif
1705 /* check for hdlc conf */
1706 member = list_entry(conf->mlist.next,
1707 struct dsp_conf_member, list);
1708 if (member->dsp->hdlc)
1709 continue;
1710 /* mix all data */
1711 memset(mixbuffer, 0, length * sizeof(s32));
1712 list_for_each_entry(member, &conf->mlist, list) {
1713 dsp = member->dsp;
1714 /* get range of data to mix */
1715 c = mixbuffer;
1716 q = dsp->rx_buff;
1717 r = dsp->rx_R;
1718 rr = (r + length) & CMX_BUFF_MASK;
1719 /* add member's data */
1720 while (r != rr) {
1721 *c++ += dsp_audio_law_to_s32[q[r]];
1722 r = (r + 1) & CMX_BUFF_MASK;
1723 }
1724 }
1725
1726 /* process each member */
1727 list_for_each_entry(member, &conf->mlist, list) {
1728 /* transmission */
1729 dsp_cmx_send_member(member->dsp, length,
1730 mixbuffer, members);
1731 }
1732 }
1733 }
1734
1735 /* delete rx-data, increment buffers, change pointers */
1736 list_for_each_entry(dsp, &dsp_ilist, list) {
1737 if (dsp->hdlc)
1738 continue;
1739 p = dsp->rx_buff;
1740 q = dsp->tx_buff;
1741 r = dsp->rx_R;
1742 /* move receive pointer when receiving */
1743 if (!dsp->rx_is_off) {
1744 rr = (r + length) & CMX_BUFF_MASK;
1745 /* delete rx-data */
1746 while (r != rr) {
1747 p[r] = dsp_silence;
1748 r = (r + 1) & CMX_BUFF_MASK;
1749 }
1750 /* increment rx-buffer pointer */
1751 dsp->rx_R = r; /* write incremented read pointer */
1752 }
1753
1754 /* check current rx_delay */
1755 delay = (dsp->rx_W-dsp->rx_R) & CMX_BUFF_MASK;
1756 if (delay >= CMX_BUFF_HALF)
1757 delay = 0; /* will be the delay before next write */
1758 /* check for lower delay */
1759 if (delay < dsp->rx_delay[0])
1760 dsp->rx_delay[0] = delay;
1761 /* check current tx_delay */
1762 delay = (dsp->tx_W-dsp->tx_R) & CMX_BUFF_MASK;
1763 if (delay >= CMX_BUFF_HALF)
1764 delay = 0; /* will be the delay before next write */
1765 /* check for lower delay */
1766 if (delay < dsp->tx_delay[0])
1767 dsp->tx_delay[0] = delay;
1768 if (jittercheck) {
1769 /* find the lowest of all rx_delays */
1770 delay = dsp->rx_delay[0];
1771 i = 1;
1772 while (i < MAX_SECONDS_JITTER_CHECK) {
1773 if (delay > dsp->rx_delay[i])
1774 delay = dsp->rx_delay[i];
1775 i++;
1776 }
1777 /*
1778 * remove rx_delay only if we have delay AND we
1779 * have not preset cmx_delay AND
1780 * the delay is greater dsp_poll
1781 */
1782 if (delay > dsp_poll && !dsp->cmx_delay) {
1783 if (dsp_debug & DEBUG_DSP_CLOCK)
1784 printk(KERN_DEBUG
1785 "%s lowest rx_delay of %d bytes for"
1786 " dsp %s are now removed.\n",
1787 __func__, delay,
1788 dsp->name);
1789 r = dsp->rx_R;
1790 rr = (r + delay - (dsp_poll >> 1))
1791 & CMX_BUFF_MASK;
1792 /* delete rx-data */
1793 while (r != rr) {
1794 p[r] = dsp_silence;
1795 r = (r + 1) & CMX_BUFF_MASK;
1796 }
1797 /* increment rx-buffer pointer */
1798 dsp->rx_R = r;
1799 /* write incremented read pointer */
1800 }
1801 /* find the lowest of all tx_delays */
1802 delay = dsp->tx_delay[0];
1803 i = 1;
1804 while (i < MAX_SECONDS_JITTER_CHECK) {
1805 if (delay > dsp->tx_delay[i])
1806 delay = dsp->tx_delay[i];
1807 i++;
1808 }
1809 /*
1810 * remove delay only if we have delay AND we
1811 * have enabled tx_dejitter
1812 */
1813 if (delay > dsp_poll && dsp->tx_dejitter) {
1814 if (dsp_debug & DEBUG_DSP_CLOCK)
1815 printk(KERN_DEBUG
1816 "%s lowest tx_delay of %d bytes for"
1817 " dsp %s are now removed.\n",
1818 __func__, delay,
1819 dsp->name);
1820 r = dsp->tx_R;
1821 rr = (r + delay - (dsp_poll >> 1))
1822 & CMX_BUFF_MASK;
1823 /* delete tx-data */
1824 while (r != rr) {
1825 q[r] = dsp_silence;
1826 r = (r + 1) & CMX_BUFF_MASK;
1827 }
1828 /* increment rx-buffer pointer */
1829 dsp->tx_R = r;
1830 /* write incremented read pointer */
1831 }
1832 /* scroll up delays */
1833 i = MAX_SECONDS_JITTER_CHECK - 1;
1834 while (i) {
1835 dsp->rx_delay[i] = dsp->rx_delay[i - 1];
1836 dsp->tx_delay[i] = dsp->tx_delay[i - 1];
1837 i--;
1838 }
1839 dsp->tx_delay[0] = CMX_BUFF_HALF; /* (infinite) delay */
1840 dsp->rx_delay[0] = CMX_BUFF_HALF; /* (infinite) delay */
1841 }
1842 }
1843
1844 /* if next event would be in the past ... */
1845 if ((s32)(dsp_spl_jiffies + dsp_tics-jiffies) <= 0)
1846 dsp_spl_jiffies = jiffies + 1;
1847 else
1848 dsp_spl_jiffies += dsp_tics;
1849
1850 dsp_spl_tl.expires = dsp_spl_jiffies;
1851 add_timer(&dsp_spl_tl);
1852
1853 /* unlock */
1854 spin_unlock_irqrestore(&dsp_lock, flags);
1855 }
1856
1857 /*
1858 * audio data is transmitted from upper layer to the dsp
1859 */
1860 void
1861 dsp_cmx_transmit(struct dsp *dsp, struct sk_buff *skb)
1862 {
1863 u_int w, ww;
1864 u8 *d, *p;
1865 int space; /* todo: , l = skb->len; */
1866 #ifdef CMX_TX_DEBUG
1867 char debugbuf[256] = "";
1868 #endif
1869
1870 /* check if there is enough space, and then copy */
1871 w = dsp->tx_W;
1872 ww = dsp->tx_R;
1873 p = dsp->tx_buff;
1874 d = skb->data;
1875 space = (ww - w - 1) & CMX_BUFF_MASK;
1876 /* write-pointer should not overrun nor reach read pointer */
1877 if (space < skb->len) {
1878 /* write to the space we have left */
1879 ww = (ww - 1) & CMX_BUFF_MASK; /* end one byte prior tx_R */
1880 if (dsp_debug & DEBUG_DSP_CLOCK)
1881 printk(KERN_DEBUG "%s: TX overflow space=%d skb->len="
1882 "%d, w=0x%04x, ww=0x%04x\n", __func__, space,
1883 skb->len, w, ww);
1884 } else
1885 /* write until all byte are copied */
1886 ww = (w + skb->len) & CMX_BUFF_MASK;
1887 dsp->tx_W = ww;
1888
1889 /* show current buffer */
1890 #ifdef CMX_DEBUG
1891 printk(KERN_DEBUG
1892 "cmx_transmit(dsp=%lx) %d bytes to 0x%x-0x%x. %s\n",
1893 (u_long)dsp, (ww - w) & CMX_BUFF_MASK, w, ww, dsp->name);
1894 #endif
1895
1896 /* copy transmit data to tx-buffer */
1897 #ifdef CMX_TX_DEBUG
1898 sprintf(debugbuf, "TX getting (%04x-%04x)%p: ", w, ww, p);
1899 #endif
1900 while (w != ww) {
1901 #ifdef CMX_TX_DEBUG
1902 if (strlen(debugbuf) < 48)
1903 sprintf(debugbuf + strlen(debugbuf), " %02x", *d);
1904 #endif
1905 p[w] = *d++;
1906 w = (w + 1) & CMX_BUFF_MASK;
1907 }
1908 #ifdef CMX_TX_DEBUG
1909 printk(KERN_DEBUG "%s\n", debugbuf);
1910 #endif
1911
1912 }
1913
1914 /*
1915 * hdlc data is received from card and sent to all members.
1916 */
1917 void
1918 dsp_cmx_hdlc(struct dsp *dsp, struct sk_buff *skb)
1919 {
1920 struct sk_buff *nskb = NULL;
1921 struct dsp_conf_member *member;
1922 struct mISDNhead *hh;
1923
1924 /* not if not active */
1925 if (!dsp->b_active)
1926 return;
1927
1928 /* check if we have sompen */
1929 if (skb->len < 1)
1930 return;
1931
1932 /* no conf */
1933 if (!dsp->conf) {
1934 /* in case of software echo */
1935 if (dsp->echo.software) {
1936 nskb = skb_clone(skb, GFP_ATOMIC);
1937 if (nskb) {
1938 hh = mISDN_HEAD_P(nskb);
1939 hh->prim = PH_DATA_REQ;
1940 hh->id = 0;
1941 skb_queue_tail(&dsp->sendq, nskb);
1942 schedule_work(&dsp->workq);
1943 }
1944 }
1945 return;
1946 }
1947 /* in case of hardware conference */
1948 if (dsp->conf->hardware)
1949 return;
1950 list_for_each_entry(member, &dsp->conf->mlist, list) {
1951 if (dsp->echo.software || member->dsp != dsp) {
1952 nskb = skb_clone(skb, GFP_ATOMIC);
1953 if (nskb) {
1954 hh = mISDN_HEAD_P(nskb);
1955 hh->prim = PH_DATA_REQ;
1956 hh->id = 0;
1957 skb_queue_tail(&member->dsp->sendq, nskb);
1958 schedule_work(&member->dsp->workq);
1959 }
1960 }
1961 }
1962 }
1963