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coda: kill redundant cast in coda_alloc_inode()
[zen-stable.git] / drivers / isdn / mISDN / dsp_cmx.c
blob76d9e673b4e16af63e296f37418fd77411f5b1bf
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 diabled 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
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
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 *
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
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
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_meber list.\n",
299 __func__);
300
301 return -EINVAL;
302 }
303
304
305 /*
306 * new conference
307 */
308 static struct dsp_conf
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
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
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
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 whithout 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 = 0;
746 conf->software = 1;
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 = 0;
838 conf->software = 1;
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 return;
944
945 /*
946 * if there is an existing conference, but not all members have joined
947 */
948 if (current_conf >= 0) {
949 join_members:
950 list_for_each_entry(member, &conf->mlist, list) {
951 /* if no conference engine on our chip, change to
952 * software */
953 if (!member->dsp->features.hfc_conf)
954 goto conf_software;
955 /* in case of hdlc, change to software */
956 if (member->dsp->hdlc)
957 goto conf_software;
958 /* join to current conference */
959 if (member->dsp->hfc_conf == current_conf)
960 continue;
961 /* get a free timeslot first */
962 memset(freeslots, 1, sizeof(freeslots));
963 list_for_each_entry(dsp, &dsp_ilist, list) {
964 /*
965 * not checking current member, because
966 * slot will be overwritten.
967 */
968 if (
969 dsp != member->dsp &&
970 /* dsp must be on the same PCM */
971 member->dsp->features.pcm_id ==
972 dsp->features.pcm_id) {
973 /* dsp must be on a slot */
974 if (dsp->pcm_slot_tx >= 0 &&
975 dsp->pcm_slot_tx <
976 sizeof(freeslots))
977 freeslots[dsp->pcm_slot_tx] = 0;
978 if (dsp->pcm_slot_rx >= 0 &&
979 dsp->pcm_slot_rx <
980 sizeof(freeslots))
981 freeslots[dsp->pcm_slot_rx] = 0;
982 }
983 }
984 i = 0;
985 ii = member->dsp->features.pcm_slots;
986 while (i < ii) {
987 if (freeslots[i])
988 break;
989 i++;
990 }
991 if (i == ii) {
992 /* no more slots available */
993 if (dsp_debug & DEBUG_DSP_CMX)
994 printk(KERN_DEBUG
995 "%s conference %d cannot be formed,"
996 " because no slot free\n",
997 __func__, conf->id);
998 goto conf_software;
999 }
1000 if (dsp_debug & DEBUG_DSP_CMX)
1001 printk(KERN_DEBUG
1002 "%s changing dsp %s to HW conference "
1003 "%d slot %d\n", __func__,
1004 member->dsp->name, current_conf, i);
1005 /* assign free slot & set PCM & join conf */
1006 member->dsp->pcm_slot_tx = i;
1007 member->dsp->pcm_slot_rx = i;
1008 member->dsp->pcm_bank_tx = 2; /* loop */
1009 member->dsp->pcm_bank_rx = 2;
1010 member->dsp->hfc_conf = current_conf;
1011 dsp_cmx_hw_message(member->dsp, MISDN_CTRL_HFC_PCM_CONN,
1012 i, 2, i, 2);
1013 dsp_cmx_hw_message(member->dsp,
1014 MISDN_CTRL_HFC_CONF_JOIN, current_conf, 0, 0, 0);
1015 }
1016 return;
1017 }
1018
1019 /*
1020 * no member is in a conference yet, so we find a free one
1021 */
1022 memset(freeunits, 1, sizeof(freeunits));
1023 list_for_each_entry(dsp, &dsp_ilist, list) {
1024 /* dsp must be on the same chip */
1025 if (dsp->features.hfc_id == same_hfc &&
1026 /* dsp must have joined a HW conference */
1027 dsp->hfc_conf >= 0 &&
1028 /* slot must be within range */
1029 dsp->hfc_conf < 8)
1030 freeunits[dsp->hfc_conf] = 0;
1031 }
1032 i = 0;
1033 ii = 8;
1034 while (i < ii) {
1035 if (freeunits[i])
1036 break;
1037 i++;
1038 }
1039 if (i == ii) {
1040 /* no more conferences available */
1041 if (dsp_debug & DEBUG_DSP_CMX)
1042 printk(KERN_DEBUG
1043 "%s conference %d cannot be formed, because "
1044 "no conference number free\n",
1045 __func__, conf->id);
1046 goto conf_software;
1047 }
1048 /* join all members */
1049 current_conf = i;
1050 goto join_members;
1051 }
1052
1053
1054 /*
1055 * conf_id != 0: join or change conference
1056 * conf_id == 0: split from conference if not already
1057 */
1058 int
1059 dsp_cmx_conf(struct dsp *dsp, u32 conf_id)
1060 {
1061 int err;
1062 struct dsp_conf *conf;
1063 struct dsp_conf_member *member;
1064
1065 /* if conference doesn't change */
1066 if (dsp->conf_id == conf_id)
1067 return 0;
1068
1069 /* first remove us from current conf */
1070 if (dsp->conf_id) {
1071 if (dsp_debug & DEBUG_DSP_CMX)
1072 printk(KERN_DEBUG "removing us from conference %d\n",
1073 dsp->conf->id);
1074 /* remove us from conf */
1075 conf = dsp->conf;
1076 err = dsp_cmx_del_conf_member(dsp);
1077 if (err)
1078 return err;
1079 dsp->conf_id = 0;
1080
1081 /* update hardware */
1082 dsp_cmx_hardware(NULL, dsp);
1083
1084 /* conf now empty? */
1085 if (list_empty(&conf->mlist)) {
1086 if (dsp_debug & DEBUG_DSP_CMX)
1087 printk(KERN_DEBUG
1088 "conference is empty, so we remove it.\n");
1089 err = dsp_cmx_del_conf(conf);
1090 if (err)
1091 return err;
1092 } else {
1093 /* update members left on conf */
1094 dsp_cmx_hardware(conf, NULL);
1095 }
1096 }
1097
1098 /* if split */
1099 if (!conf_id)
1100 return 0;
1101
1102 /* now add us to conf */
1103 if (dsp_debug & DEBUG_DSP_CMX)
1104 printk(KERN_DEBUG "searching conference %d\n",
1105 conf_id);
1106 conf = dsp_cmx_search_conf(conf_id);
1107 if (!conf) {
1108 if (dsp_debug & DEBUG_DSP_CMX)
1109 printk(KERN_DEBUG
1110 "conference doesn't exist yet, creating.\n");
1111 /* the conference doesn't exist, so we create */
1112 conf = dsp_cmx_new_conf(conf_id);
1113 if (!conf)
1114 return -EINVAL;
1115 } else if (!list_empty(&conf->mlist)) {
1116 member = list_entry(conf->mlist.next, struct dsp_conf_member,
1117 list);
1118 if (dsp->hdlc && !member->dsp->hdlc) {
1119 if (dsp_debug & DEBUG_DSP_CMX)
1120 printk(KERN_DEBUG
1121 "cannot join transparent conference.\n");
1122 return -EINVAL;
1123 }
1124 if (!dsp->hdlc && member->dsp->hdlc) {
1125 if (dsp_debug & DEBUG_DSP_CMX)
1126 printk(KERN_DEBUG
1127 "cannot join hdlc conference.\n");
1128 return -EINVAL;
1129 }
1130 }
1131 /* add conference member */
1132 err = dsp_cmx_add_conf_member(dsp, conf);
1133 if (err)
1134 return err;
1135 dsp->conf_id = conf_id;
1136
1137 /* if we are alone, we do nothing! */
1138 if (list_empty(&conf->mlist)) {
1139 if (dsp_debug & DEBUG_DSP_CMX)
1140 printk(KERN_DEBUG
1141 "we are alone in this conference, so exit.\n");
1142 /* update hardware */
1143 dsp_cmx_hardware(NULL, dsp);
1144 return 0;
1145 }
1146
1147 /* update members on conf */
1148 dsp_cmx_hardware(conf, NULL);
1149
1150 return 0;
1151 }
1152
1153 #ifdef CMX_DELAY_DEBUG
1154 int delaycount;
1155 static void
1156 showdelay(struct dsp *dsp, int samples, int delay)
1157 {
1158 char bar[] = "--------------------------------------------------|";
1159 int sdelay;
1160
1161 delaycount += samples;
1162 if (delaycount < 8000)
1163 return;
1164 delaycount = 0;
1165
1166 sdelay = delay * 50 / (dsp_poll << 2);
1167
1168 printk(KERN_DEBUG "DELAY (%s) %3d >%s\n", dsp->name, delay,
1169 sdelay > 50 ? "..." : bar + 50 - sdelay);
1170 }
1171 #endif
1172
1173 /*
1174 * audio data is received from card
1175 */
1176 void
1177 dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb)
1178 {
1179 u8 *d, *p;
1180 int len = skb->len;
1181 struct mISDNhead *hh = mISDN_HEAD_P(skb);
1182 int w, i, ii;
1183
1184 /* check if we have sompen */
1185 if (len < 1)
1186 return;
1187
1188 /* half of the buffer should be larger than maximum packet size */
1189 if (len >= CMX_BUFF_HALF) {
1190 printk(KERN_ERR
1191 "%s line %d: packet from card is too large (%d bytes). "
1192 "please make card send smaller packets OR increase "
1193 "CMX_BUFF_SIZE\n", __FILE__, __LINE__, len);
1194 return;
1195 }
1196
1197 /*
1198 * initialize pointers if not already -
1199 * also add delay if requested by PH_SIGNAL
1200 */
1201 if (dsp->rx_init) {
1202 dsp->rx_init = 0;
1203 if (dsp->features.unordered) {
1204 dsp->rx_R = (hh->id & CMX_BUFF_MASK);
1205 if (dsp->cmx_delay)
1206 dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
1207 & CMX_BUFF_MASK;
1208 else
1209 dsp->rx_W = (dsp->rx_R + (dsp_poll >> 1))
1210 & CMX_BUFF_MASK;
1211 } else {
1212 dsp->rx_R = 0;
1213 if (dsp->cmx_delay)
1214 dsp->rx_W = dsp->cmx_delay;
1215 else
1216 dsp->rx_W = dsp_poll >> 1;
1217 }
1218 }
1219 /* if frame contains time code, write directly */
1220 if (dsp->features.unordered) {
1221 dsp->rx_W = (hh->id & CMX_BUFF_MASK);
1222 /* printk(KERN_DEBUG "%s %08x\n", dsp->name, hh->id); */
1223 }
1224 /*
1225 * if we underrun (or maybe overrun),
1226 * we set our new read pointer, and write silence to buffer
1227 */
1228 if (((dsp->rx_W-dsp->rx_R) & CMX_BUFF_MASK) >= CMX_BUFF_HALF) {
1229 if (dsp_debug & DEBUG_DSP_CLOCK)
1230 printk(KERN_DEBUG
1231 "cmx_receive(dsp=%lx): UNDERRUN (or overrun the "
1232 "maximum delay), adjusting read pointer! "
1233 "(inst %s)\n", (u_long)dsp, dsp->name);
1234 /* flush rx buffer and set delay to dsp_poll / 2 */
1235 if (dsp->features.unordered) {
1236 dsp->rx_R = (hh->id & CMX_BUFF_MASK);
1237 if (dsp->cmx_delay)
1238 dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
1239 & CMX_BUFF_MASK;
1240 else
1241 dsp->rx_W = (dsp->rx_R + (dsp_poll >> 1))
1242 & CMX_BUFF_MASK;
1243 } else {
1244 dsp->rx_R = 0;
1245 if (dsp->cmx_delay)
1246 dsp->rx_W = dsp->cmx_delay;
1247 else
1248 dsp->rx_W = dsp_poll >> 1;
1249 }
1250 memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
1251 }
1252 /* if we have reached double delay, jump back to middle */
1253 if (dsp->cmx_delay)
1254 if (((dsp->rx_W - dsp->rx_R) & CMX_BUFF_MASK) >=
1255 (dsp->cmx_delay << 1)) {
1256 if (dsp_debug & DEBUG_DSP_CLOCK)
1257 printk(KERN_DEBUG
1258 "cmx_receive(dsp=%lx): OVERRUN (because "
1259 "twice the delay is reached), adjusting "
1260 "read pointer! (inst %s)\n",
1261 (u_long)dsp, dsp->name);
1262 /* flush buffer */
1263 if (dsp->features.unordered) {
1264 dsp->rx_R = (hh->id & CMX_BUFF_MASK);
1265 dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
1266 & CMX_BUFF_MASK;
1267 } else {
1268 dsp->rx_R = 0;
1269 dsp->rx_W = dsp->cmx_delay;
1270 }
1271 memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
1272 }
1273
1274 /* show where to write */
1275 #ifdef CMX_DEBUG
1276 printk(KERN_DEBUG
1277 "cmx_receive(dsp=%lx): rx_R(dsp)=%05x rx_W(dsp)=%05x len=%d %s\n",
1278 (u_long)dsp, dsp->rx_R, dsp->rx_W, len, dsp->name);
1279 #endif
1280
1281 /* write data into rx_buffer */
1282 p = skb->data;
1283 d = dsp->rx_buff;
1284 w = dsp->rx_W;
1285 i = 0;
1286 ii = len;
1287 while (i < ii) {
1288 d[w++ & CMX_BUFF_MASK] = *p++;
1289 i++;
1290 }
1291
1292 /* increase write-pointer */
1293 dsp->rx_W = ((dsp->rx_W+len) & CMX_BUFF_MASK);
1294 #ifdef CMX_DELAY_DEBUG
1295 showdelay(dsp, len, (dsp->rx_W-dsp->rx_R) & CMX_BUFF_MASK);
1296 #endif
1297 }
1298
1299
1300 /*
1301 * send (mixed) audio data to card and control jitter
1302 */
1303 static void
1304 dsp_cmx_send_member(struct dsp *dsp, int len, s32 *c, int members)
1305 {
1306 struct dsp_conf *conf = dsp->conf;
1307 struct dsp *member, *other;
1308 register s32 sample;
1309 u8 *d, *p, *q, *o_q;
1310 struct sk_buff *nskb, *txskb;
1311 int r, rr, t, tt, o_r, o_rr;
1312 int preload = 0;
1313 struct mISDNhead *hh, *thh;
1314 int tx_data_only = 0;
1315
1316 /* don't process if: */
1317 if (!dsp->b_active) { /* if not active */
1318 dsp->last_tx = 0;
1319 return;
1320 }
1321 if (((dsp->conf && dsp->conf->hardware) || /* hardware conf */
1322 dsp->echo.hardware) && /* OR hardware echo */
1323 dsp->tx_R == dsp->tx_W && /* AND no tx-data */
1324 !(dsp->tone.tone && dsp->tone.software)) { /* AND not soft tones */
1325 if (!dsp->tx_data) { /* no tx_data for user space required */
1326 dsp->last_tx = 0;
1327 return;
1328 }
1329 if (dsp->conf && dsp->conf->software && dsp->conf->hardware)
1330 tx_data_only = 1;
1331 if (dsp->conf->software && dsp->echo.hardware)
1332 tx_data_only = 1;
1333 }
1334
1335 #ifdef CMX_DEBUG
1336 printk(KERN_DEBUG
1337 "SEND members=%d dsp=%s, conf=%p, rx_R=%05x rx_W=%05x\n",
1338 members, dsp->name, conf, dsp->rx_R, dsp->rx_W);
1339 #endif
1340
1341 /* preload if we have delay set */
1342 if (dsp->cmx_delay && !dsp->last_tx) {
1343 preload = len;
1344 if (preload < 128)
1345 preload = 128;
1346 }
1347
1348 /* PREPARE RESULT */
1349 nskb = mI_alloc_skb(len + preload, GFP_ATOMIC);
1350 if (!nskb) {
1351 printk(KERN_ERR
1352 "FATAL ERROR in mISDN_dsp.o: cannot alloc %d bytes\n",
1353 len + preload);
1354 return;
1355 }
1356 hh = mISDN_HEAD_P(nskb);
1357 hh->prim = PH_DATA_REQ;
1358 hh->id = 0;
1359 dsp->last_tx = 1;
1360
1361 /* set pointers, indexes and stuff */
1362 member = dsp;
1363 p = dsp->tx_buff; /* transmit data */
1364 q = dsp->rx_buff; /* received data */
1365 d = skb_put(nskb, preload + len); /* result */
1366 t = dsp->tx_R; /* tx-pointers */
1367 tt = dsp->tx_W;
1368 r = dsp->rx_R; /* rx-pointers */
1369 rr = (r + len) & CMX_BUFF_MASK;
1370
1371 /* preload with silence, if required */
1372 if (preload) {
1373 memset(d, dsp_silence, preload);
1374 d += preload;
1375 }
1376
1377 /* PROCESS TONES/TX-DATA ONLY */
1378 if (dsp->tone.tone && dsp->tone.software) {
1379 /* -> copy tone */
1380 dsp_tone_copy(dsp, d, len);
1381 dsp->tx_R = 0; /* clear tx buffer */
1382 dsp->tx_W = 0;
1383 goto send_packet;
1384 }
1385 /* if we have tx-data but do not use mixing */
1386 if (!dsp->tx_mix && t != tt) {
1387 /* -> send tx-data and continue when not enough */
1388 #ifdef CMX_TX_DEBUG
1389 sprintf(debugbuf, "TX sending (%04x-%04x)%p: ", t, tt, p);
1390 #endif
1391 while (r != rr && t != tt) {
1392 #ifdef CMX_TX_DEBUG
1393 if (strlen(debugbuf) < 48)
1394 sprintf(debugbuf+strlen(debugbuf), " %02x",
1395 p[t]);
1396 #endif
1397 *d++ = p[t]; /* write tx_buff */
1398 t = (t+1) & CMX_BUFF_MASK;
1399 r = (r+1) & CMX_BUFF_MASK;
1400 }
1401 if (r == rr) {
1402 dsp->tx_R = t;
1403 #ifdef CMX_TX_DEBUG
1404 printk(KERN_DEBUG "%s\n", debugbuf);
1405 #endif
1406 goto send_packet;
1407 }
1408 }
1409 #ifdef CMX_TX_DEBUG
1410 printk(KERN_DEBUG "%s\n", debugbuf);
1411 #endif
1412
1413 /* PROCESS DATA (one member / no conf) */
1414 if (!conf || members <= 1) {
1415 /* -> if echo is NOT enabled */
1416 if (!dsp->echo.software) {
1417 /* -> send tx-data if available or use 0-volume */
1418 while (r != rr && t != tt) {
1419 *d++ = p[t]; /* write tx_buff */
1420 t = (t+1) & CMX_BUFF_MASK;
1421 r = (r+1) & CMX_BUFF_MASK;
1422 }
1423 if (r != rr) {
1424 if (dsp_debug & DEBUG_DSP_CLOCK)
1425 printk(KERN_DEBUG "%s: RX empty\n",
1426 __func__);
1427 memset(d, dsp_silence, (rr-r)&CMX_BUFF_MASK);
1428 }
1429 /* -> if echo is enabled */
1430 } else {
1431 /*
1432 * -> mix tx-data with echo if available,
1433 * or use echo only
1434 */
1435 while (r != rr && t != tt) {
1436 *d++ = dsp_audio_mix_law[(p[t]<<8)|q[r]];
1437 t = (t+1) & CMX_BUFF_MASK;
1438 r = (r+1) & CMX_BUFF_MASK;
1439 }
1440 while (r != rr) {
1441 *d++ = q[r]; /* echo */
1442 r = (r+1) & CMX_BUFF_MASK;
1443 }
1444 }
1445 dsp->tx_R = t;
1446 goto send_packet;
1447 }
1448 /* PROCESS DATA (two members) */
1449 #ifdef CMX_CONF_DEBUG
1450 if (0) {
1451 #else
1452 if (members == 2) {
1453 #endif
1454 /* "other" becomes other party */
1455 other = (list_entry(conf->mlist.next,
1456 struct dsp_conf_member, list))->dsp;
1457 if (other == member)
1458 other = (list_entry(conf->mlist.prev,
1459 struct dsp_conf_member, list))->dsp;
1460 o_q = other->rx_buff; /* received data */
1461 o_rr = (other->rx_R + len) & CMX_BUFF_MASK;
1462 /* end of rx-pointer */
1463 o_r = (o_rr - rr + r) & CMX_BUFF_MASK;
1464 /* start rx-pointer at current read position*/
1465 /* -> if echo is NOT enabled */
1466 if (!dsp->echo.software) {
1467 /*
1468 * -> copy other member's rx-data,
1469 * if tx-data is available, mix
1470 */
1471 while (o_r != o_rr && t != tt) {
1472 *d++ = dsp_audio_mix_law[(p[t]<<8)|o_q[o_r]];
1473 t = (t+1) & CMX_BUFF_MASK;
1474 o_r = (o_r+1) & CMX_BUFF_MASK;
1475 }
1476 while (o_r != o_rr) {
1477 *d++ = o_q[o_r];
1478 o_r = (o_r+1) & CMX_BUFF_MASK;
1479 }
1480 /* -> if echo is enabled */
1481 } else {
1482 /*
1483 * -> mix other member's rx-data with echo,
1484 * if tx-data is available, mix
1485 */
1486 while (r != rr && t != tt) {
1487 sample = dsp_audio_law_to_s32[p[t]] +
1488 dsp_audio_law_to_s32[q[r]] +
1489 dsp_audio_law_to_s32[o_q[o_r]];
1490 if (sample < -32768)
1491 sample = -32768;
1492 else if (sample > 32767)
1493 sample = 32767;
1494 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1495 /* tx-data + rx_data + echo */
1496 t = (t+1) & CMX_BUFF_MASK;
1497 r = (r+1) & CMX_BUFF_MASK;
1498 o_r = (o_r+1) & CMX_BUFF_MASK;
1499 }
1500 while (r != rr) {
1501 *d++ = dsp_audio_mix_law[(q[r]<<8)|o_q[o_r]];
1502 r = (r+1) & CMX_BUFF_MASK;
1503 o_r = (o_r+1) & CMX_BUFF_MASK;
1504 }
1505 }
1506 dsp->tx_R = t;
1507 goto send_packet;
1508 }
1509 #ifdef DSP_NEVER_DEFINED
1510 }
1511 #endif
1512 /* PROCESS DATA (three or more members) */
1513 /* -> if echo is NOT enabled */
1514 if (!dsp->echo.software) {
1515 /*
1516 * -> substract rx-data from conf-data,
1517 * if tx-data is available, mix
1518 */
1519 while (r != rr && t != tt) {
1520 sample = dsp_audio_law_to_s32[p[t]] + *c++ -
1521 dsp_audio_law_to_s32[q[r]];
1522 if (sample < -32768)
1523 sample = -32768;
1524 else if (sample > 32767)
1525 sample = 32767;
1526 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1527 /* conf-rx+tx */
1528 r = (r+1) & CMX_BUFF_MASK;
1529 t = (t+1) & CMX_BUFF_MASK;
1530 }
1531 while (r != rr) {
1532 sample = *c++ - dsp_audio_law_to_s32[q[r]];
1533 if (sample < -32768)
1534 sample = -32768;
1535 else if (sample > 32767)
1536 sample = 32767;
1537 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1538 /* conf-rx */
1539 r = (r+1) & CMX_BUFF_MASK;
1540 }
1541 /* -> if echo is enabled */
1542 } else {
1543 /*
1544 * -> encode conf-data, if tx-data
1545 * is available, mix
1546 */
1547 while (r != rr && t != tt) {
1548 sample = dsp_audio_law_to_s32[p[t]] + *c++;
1549 if (sample < -32768)
1550 sample = -32768;
1551 else if (sample > 32767)
1552 sample = 32767;
1553 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1554 /* conf(echo)+tx */
1555 t = (t+1) & CMX_BUFF_MASK;
1556 r = (r+1) & CMX_BUFF_MASK;
1557 }
1558 while (r != rr) {
1559 sample = *c++;
1560 if (sample < -32768)
1561 sample = -32768;
1562 else if (sample > 32767)
1563 sample = 32767;
1564 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1565 /* conf(echo) */
1566 r = (r+1) & CMX_BUFF_MASK;
1567 }
1568 }
1569 dsp->tx_R = t;
1570 goto send_packet;
1571
1572 send_packet:
1573 /*
1574 * send tx-data if enabled - don't filter,
1575 * becuase we want what we send, not what we filtered
1576 */
1577 if (dsp->tx_data) {
1578 if (tx_data_only) {
1579 hh->prim = DL_DATA_REQ;
1580 hh->id = 0;
1581 /* queue and trigger */
1582 skb_queue_tail(&dsp->sendq, nskb);
1583 schedule_work(&dsp->workq);
1584 /* exit because only tx_data is used */
1585 return;
1586 } else {
1587 txskb = mI_alloc_skb(len, GFP_ATOMIC);
1588 if (!txskb) {
1589 printk(KERN_ERR
1590 "FATAL ERROR in mISDN_dsp.o: "
1591 "cannot alloc %d bytes\n", len);
1592 } else {
1593 thh = mISDN_HEAD_P(txskb);
1594 thh->prim = DL_DATA_REQ;
1595 thh->id = 0;
1596 memcpy(skb_put(txskb, len), nskb->data+preload,
1597 len);
1598 /* queue (trigger later) */
1599 skb_queue_tail(&dsp->sendq, txskb);
1600 }
1601 }
1602 }
1603
1604 /* send data only to card, if we don't just calculated tx_data */
1605 /* adjust volume */
1606 if (dsp->tx_volume)
1607 dsp_change_volume(nskb, dsp->tx_volume);
1608 /* pipeline */
1609 if (dsp->pipeline.inuse)
1610 dsp_pipeline_process_tx(&dsp->pipeline, nskb->data,
1611 nskb->len);
1612 /* crypt */
1613 if (dsp->bf_enable)
1614 dsp_bf_encrypt(dsp, nskb->data, nskb->len);
1615 /* queue and trigger */
1616 skb_queue_tail(&dsp->sendq, nskb);
1617 schedule_work(&dsp->workq);
1618 }
1619
1620 static u32 jittercount; /* counter for jitter check */
1621 struct timer_list dsp_spl_tl;
1622 u32 dsp_spl_jiffies; /* calculate the next time to fire */
1623 static u16 dsp_count; /* last sample count */
1624 static int dsp_count_valid ; /* if we have last sample count */
1625
1626 void
1627 dsp_cmx_send(void *arg)
1628 {
1629 struct dsp_conf *conf;
1630 struct dsp_conf_member *member;
1631 struct dsp *dsp;
1632 int mustmix, members;
1633 static s32 mixbuffer[MAX_POLL+100];
1634 s32 *c;
1635 u8 *p, *q;
1636 int r, rr;
1637 int jittercheck = 0, delay, i;
1638 u_long flags;
1639 u16 length, count;
1640
1641 /* lock */
1642 spin_lock_irqsave(&dsp_lock, flags);
1643
1644 if (!dsp_count_valid) {
1645 dsp_count = mISDN_clock_get();
1646 length = dsp_poll;
1647 dsp_count_valid = 1;
1648 } else {
1649 count = mISDN_clock_get();
1650 length = count - dsp_count;
1651 dsp_count = count;
1652 }
1653 if (length > MAX_POLL + 100)
1654 length = MAX_POLL + 100;
1655 /* printk(KERN_DEBUG "len=%d dsp_count=0x%x\n", length, dsp_count); */
1656
1657 /*
1658 * check if jitter needs to be checked (this is every second)
1659 */
1660 jittercount += length;
1661 if (jittercount >= 8000) {
1662 jittercount -= 8000;
1663 jittercheck = 1;
1664 }
1665
1666 /* loop all members that do not require conference mixing */
1667 list_for_each_entry(dsp, &dsp_ilist, list) {
1668 if (dsp->hdlc)
1669 continue;
1670 conf = dsp->conf;
1671 mustmix = 0;
1672 members = 0;
1673 if (conf) {
1674 members = count_list_member(&conf->mlist);
1675 #ifdef CMX_CONF_DEBUG
1676 if (conf->software && members > 1)
1677 #else
1678 if (conf->software && members > 2)
1679 #endif
1680 mustmix = 1;
1681 }
1682
1683 /* transmission required */
1684 if (!mustmix) {
1685 dsp_cmx_send_member(dsp, length, mixbuffer, members);
1686
1687 /*
1688 * unused mixbuffer is given to prevent a
1689 * potential null-pointer-bug
1690 */
1691 }
1692 }
1693
1694 /* loop all members that require conference mixing */
1695 list_for_each_entry(conf, &conf_ilist, list) {
1696 /* count members and check hardware */
1697 members = count_list_member(&conf->mlist);
1698 #ifdef CMX_CONF_DEBUG
1699 if (conf->software && members > 1) {
1700 #else
1701 if (conf->software && members > 2) {
1702 #endif
1703 /* check for hdlc conf */
1704 member = list_entry(conf->mlist.next,
1705 struct dsp_conf_member, list);
1706 if (member->dsp->hdlc)
1707 continue;
1708 /* mix all data */
1709 memset(mixbuffer, 0, length*sizeof(s32));
1710 list_for_each_entry(member, &conf->mlist, list) {
1711 dsp = member->dsp;
1712 /* get range of data to mix */
1713 c = mixbuffer;
1714 q = dsp->rx_buff;
1715 r = dsp->rx_R;
1716 rr = (r + length) & CMX_BUFF_MASK;
1717 /* add member's data */
1718 while (r != rr) {
1719 *c++ += dsp_audio_law_to_s32[q[r]];
1720 r = (r+1) & CMX_BUFF_MASK;
1721 }
1722 }
1723
1724 /* process each member */
1725 list_for_each_entry(member, &conf->mlist, list) {
1726 /* transmission */
1727 dsp_cmx_send_member(member->dsp, length,
1728 mixbuffer, members);
1729 }
1730 }
1731 }
1732
1733 /* delete rx-data, increment buffers, change pointers */
1734 list_for_each_entry(dsp, &dsp_ilist, list) {
1735 if (dsp->hdlc)
1736 continue;
1737 p = dsp->rx_buff;
1738 q = dsp->tx_buff;
1739 r = dsp->rx_R;
1740 /* move receive pointer when receiving */
1741 if (!dsp->rx_is_off) {
1742 rr = (r + length) & CMX_BUFF_MASK;
1743 /* delete rx-data */
1744 while (r != rr) {
1745 p[r] = dsp_silence;
1746 r = (r+1) & CMX_BUFF_MASK;
1747 }
1748 /* increment rx-buffer pointer */
1749 dsp->rx_R = r; /* write incremented read pointer */
1750 }
1751
1752 /* check current rx_delay */
1753 delay = (dsp->rx_W-dsp->rx_R) & CMX_BUFF_MASK;
1754 if (delay >= CMX_BUFF_HALF)
1755 delay = 0; /* will be the delay before next write */
1756 /* check for lower delay */
1757 if (delay < dsp->rx_delay[0])
1758 dsp->rx_delay[0] = delay;
1759 /* check current tx_delay */
1760 delay = (dsp->tx_W-dsp->tx_R) & CMX_BUFF_MASK;
1761 if (delay >= CMX_BUFF_HALF)
1762 delay = 0; /* will be the delay before next write */
1763 /* check for lower delay */
1764 if (delay < dsp->tx_delay[0])
1765 dsp->tx_delay[0] = delay;
1766 if (jittercheck) {
1767 /* find the lowest of all rx_delays */
1768 delay = dsp->rx_delay[0];
1769 i = 1;
1770 while (i < MAX_SECONDS_JITTER_CHECK) {
1771 if (delay > dsp->rx_delay[i])
1772 delay = dsp->rx_delay[i];
1773 i++;
1774 }
1775 /*
1776 * remove rx_delay only if we have delay AND we
1777 * have not preset cmx_delay AND
1778 * the delay is greater dsp_poll
1779 */
1780 if (delay > dsp_poll && !dsp->cmx_delay) {
1781 if (dsp_debug & DEBUG_DSP_CLOCK)
1782 printk(KERN_DEBUG
1783 "%s lowest rx_delay of %d bytes for"
1784 " dsp %s are now removed.\n",
1785 __func__, delay,
1786 dsp->name);
1787 r = dsp->rx_R;
1788 rr = (r + delay - (dsp_poll >> 1))
1789 & CMX_BUFF_MASK;
1790 /* delete rx-data */
1791 while (r != rr) {
1792 p[r] = dsp_silence;
1793 r = (r+1) & CMX_BUFF_MASK;
1794 }
1795 /* increment rx-buffer pointer */
1796 dsp->rx_R = r;
1797 /* write incremented read pointer */
1798 }
1799 /* find the lowest of all tx_delays */
1800 delay = dsp->tx_delay[0];
1801 i = 1;
1802 while (i < MAX_SECONDS_JITTER_CHECK) {
1803 if (delay > dsp->tx_delay[i])
1804 delay = dsp->tx_delay[i];
1805 i++;
1806 }
1807 /*
1808 * remove delay only if we have delay AND we
1809 * have enabled tx_dejitter
1810 */
1811 if (delay > dsp_poll && dsp->tx_dejitter) {
1812 if (dsp_debug & DEBUG_DSP_CLOCK)
1813 printk(KERN_DEBUG
1814 "%s lowest tx_delay of %d bytes for"
1815 " dsp %s are now removed.\n",
1816 __func__, delay,
1817 dsp->name);
1818 r = dsp->tx_R;
1819 rr = (r + delay - (dsp_poll >> 1))
1820 & CMX_BUFF_MASK;
1821 /* delete tx-data */
1822 while (r != rr) {
1823 q[r] = dsp_silence;
1824 r = (r+1) & CMX_BUFF_MASK;
1825 }
1826 /* increment rx-buffer pointer */
1827 dsp->tx_R = r;
1828 /* write incremented read pointer */
1829 }
1830 /* scroll up delays */
1831 i = MAX_SECONDS_JITTER_CHECK - 1;
1832 while (i) {
1833 dsp->rx_delay[i] = dsp->rx_delay[i-1];
1834 dsp->tx_delay[i] = dsp->tx_delay[i-1];
1835 i--;
1836 }
1837 dsp->tx_delay[0] = CMX_BUFF_HALF; /* (infinite) delay */
1838 dsp->rx_delay[0] = CMX_BUFF_HALF; /* (infinite) delay */
1839 }
1840 }
1841
1842 /* if next event would be in the past ... */
1843 if ((s32)(dsp_spl_jiffies+dsp_tics-jiffies) <= 0)
1844 dsp_spl_jiffies = jiffies + 1;
1845 else
1846 dsp_spl_jiffies += dsp_tics;
1847
1848 dsp_spl_tl.expires = dsp_spl_jiffies;
1849 add_timer(&dsp_spl_tl);
1850
1851 /* unlock */
1852 spin_unlock_irqrestore(&dsp_lock, flags);
1853 }
1854
1855 /*
1856 * audio data is transmitted from upper layer to the dsp
1857 */
1858 void
1859 dsp_cmx_transmit(struct dsp *dsp, struct sk_buff *skb)
1860 {
1861 u_int w, ww;
1862 u8 *d, *p;
1863 int space; /* todo: , l = skb->len; */
1864 #ifdef CMX_TX_DEBUG
1865 char debugbuf[256] = "";
1866 #endif
1867
1868 /* check if there is enough space, and then copy */
1869 w = dsp->tx_W;
1870 ww = dsp->tx_R;
1871 p = dsp->tx_buff;
1872 d = skb->data;
1873 space = (ww - w - 1) & CMX_BUFF_MASK;
1874 /* write-pointer should not overrun nor reach read pointer */
1875 if (space < skb->len) {
1876 /* write to the space we have left */
1877 ww = (ww - 1) & CMX_BUFF_MASK; /* end one byte prior tx_R */
1878 if (dsp_debug & DEBUG_DSP_CLOCK)
1879 printk(KERN_DEBUG "%s: TX overflow space=%d skb->len="
1880 "%d, w=0x%04x, ww=0x%04x\n", __func__, space,
1881 skb->len, w, ww);
1882 } else
1883 /* write until all byte are copied */
1884 ww = (w + skb->len) & CMX_BUFF_MASK;
1885 dsp->tx_W = ww;
1886
1887 /* show current buffer */
1888 #ifdef CMX_DEBUG
1889 printk(KERN_DEBUG
1890 "cmx_transmit(dsp=%lx) %d bytes to 0x%x-0x%x. %s\n",
1891 (u_long)dsp, (ww-w)&CMX_BUFF_MASK, w, ww, dsp->name);
1892 #endif
1893
1894 /* copy transmit data to tx-buffer */
1895 #ifdef CMX_TX_DEBUG
1896 sprintf(debugbuf, "TX getting (%04x-%04x)%p: ", w, ww, p);
1897 #endif
1898 while (w != ww) {
1899 #ifdef CMX_TX_DEBUG
1900 if (strlen(debugbuf) < 48)
1901 sprintf(debugbuf+strlen(debugbuf), " %02x", *d);
1902 #endif
1903 p[w] = *d++;
1904 w = (w+1) & CMX_BUFF_MASK;
1905 }
1906 #ifdef CMX_TX_DEBUG
1907 printk(KERN_DEBUG "%s\n", debugbuf);
1908 #endif
1909
1910 }
1911
1912 /*
1913 * hdlc data is received from card and sent to all members.
1914 */
1915 void
1916 dsp_cmx_hdlc(struct dsp *dsp, struct sk_buff *skb)
1917 {
1918 struct sk_buff *nskb = NULL;
1919 struct dsp_conf_member *member;
1920 struct mISDNhead *hh;
1921
1922 /* not if not active */
1923 if (!dsp->b_active)
1924 return;
1925
1926 /* check if we have sompen */
1927 if (skb->len < 1)
1928 return;
1929
1930 /* no conf */
1931 if (!dsp->conf) {
1932 /* in case of software echo */
1933 if (dsp->echo.software) {
1934 nskb = skb_clone(skb, GFP_ATOMIC);
1935 if (nskb) {
1936 hh = mISDN_HEAD_P(nskb);
1937 hh->prim = PH_DATA_REQ;
1938 hh->id = 0;
1939 skb_queue_tail(&dsp->sendq, nskb);
1940 schedule_work(&dsp->workq);
1941 }
1942 }
1943 return;
1944 }
1945 /* in case of hardware conference */
1946 if (dsp->conf->hardware)
1947 return;
1948 list_for_each_entry(member, &dsp->conf->mlist, list) {
1949 if (dsp->echo.software || member->dsp != dsp) {
1950 nskb = skb_clone(skb, GFP_ATOMIC);
1951 if (nskb) {
1952 hh = mISDN_HEAD_P(nskb);
1953 hh->prim = PH_DATA_REQ;
1954 hh->id = 0;
1955 skb_queue_tail(&member->dsp->sendq, nskb);
1956 schedule_work(&member->dsp->workq);
1957 }
1958 }
1959 }
1960 }
1961
1962