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[mirror_ubuntu-artful-kernel.git] / drivers / isdn / mISDN / dsp_core.c
CommitLineData
960366cf
KK		 1/*
2 * Author Andreas Eversberg (jolly@eversberg.eu)
3 * Based on source code structure by
4 * Karsten Keil (keil@isdn4linux.de)
5 *
6 * This file is (c) under GNU PUBLIC LICENSE
7 * For changes and modifications please read
8 * ../../../Documentation/isdn/mISDN.cert
9 *
10 * Thanks to Karsten Keil (great drivers)
11 * Cologne Chip (great chips)
12 *
13 * This module does:
14 * Real-time tone generation
15 * DTMF detection
16 * Real-time cross-connection and conferrence
17 * Compensate jitter due to system load and hardware fault.
18 * All features are done in kernel space and will be realized
19 * using hardware, if available and supported by chip set.
20 * Blowfish encryption/decryption
21 */
22
23/* STRUCTURE:
24 *
25 * The dsp module provides layer 2 for b-channels (64kbit). It provides
26 * transparent audio forwarding with special digital signal processing:
27 *
28 * - (1) generation of tones
29 * - (2) detection of dtmf tones
30 * - (3) crossconnecting and conferences (clocking)
31 * - (4) echo generation for delay test
32 * - (5) volume control
33 * - (6) disable receive data
34 * - (7) pipeline
35 * - (8) encryption/decryption
36 *
37 * Look:
38 * TX RX
39 * ------upper layer------
40 * | ^
41 * | |(6)
42 * v |
43 * +-----+-------------+-----+
44 * |(3)(4) |
45 * | CMX |
46 * | |
47 * | +-------------+
48 * | | ^
49 * | | |
50 * |+---------+| +----+----+
51 * ||(1) || |(2) |
52 * || || | |
53 * || Tones || | DTMF |
54 * || || | |
55 * || || | |
56 * |+----+----+| +----+----+
57 * +-----+-----+ ^
58 * | |
59 * v |
60 * +----+----+ +----+----+
61 * |(5) | |(5) |
62 * | | | |
63 * |TX Volume| |RX Volume|
64 * | | | |
65 * | | | |
66 * +----+----+ +----+----+
67 * | ^
68 * | |
69 * v |
70 * +----+-------------+----+
71 * |(7) |
72 * | |
73 * | Pipeline Processing |
74 * | |
75 * | |
76 * +----+-------------+----+
77 * | ^
78 * | |
79 * v |
80 * +----+----+ +----+----+
81 * |(8) | |(8) |
82 * | | | |
83 * | Encrypt | | Decrypt |
84 * | | | |
85 * | | | |
86 * +----+----+ +----+----+
87 * | ^
88 * | |
89 * v |
90 * ------card layer------
91 * TX RX
92 *
93 * Above you can see the logical data flow. If software is used to do the
94 * process, it is actually the real data flow. If hardware is used, data
95 * may not flow, but hardware commands to the card, to provide the data flow
96 * as shown.
97 *
98 * NOTE: The channel must be activated in order to make dsp work, even if
99 * no data flow to the upper layer is intended. Activation can be done
100 * after and before controlling the setting using PH_CONTROL requests.
101 *
102 * DTMF: Will be detected by hardware if possible. It is done before CMX
103 * processing.
104 *
105 * Tones: Will be generated via software if endless looped audio fifos are
106 * not supported by hardware. Tones will override all data from CMX.
107 * It is not required to join a conference to use tones at any time.
108 *
109 * CMX: Is transparent when not used. When it is used, it will do
110 * crossconnections and conferences via software if not possible through
111 * hardware. If hardware capability is available, hardware is used.
112 *
af901ca1 113 * Echo: Is generated by CMX and is used to check performance of hard and
960366cf
KK		 114 * software CMX.
115 *
116 * The CMX has special functions for conferences with one, two and more
117 * members. It will allow different types of data flow. Receive and transmit
25985edc 118 * data to/form upper layer may be swithed on/off individually without losing
960366cf
KK		 119 * features of CMX, Tones and DTMF.
120 *
121 * Echo Cancellation: Sometimes we like to cancel echo from the interface.
122 * Note that a VoIP call may not have echo caused by the IP phone. The echo
123 * is generated by the telephone line connected to it. Because the delay
124 * is high, it becomes an echo. RESULT: Echo Cachelation is required if
125 * both echo AND delay is applied to an interface.
126 * Remember that software CMX always generates a more or less delay.
127 *
128 * If all used features can be realized in hardware, and if transmit and/or
129 * receive data ist disabled, the card may not send/receive any data at all.
25985edc
LDM		 130 * Not receiving is useful if only announcements are played. Not sending is
131 * useful if an answering machine records audio. Not sending and receiving is
132 * useful during most states of the call. If supported by hardware, tones
960366cf
KK		 133 * will be played without cpu load. Small PBXs and NT-Mode applications will
134 * not need expensive hardware when processing calls.
135 *
136 *
137 * LOCKING:
138 *
139 * When data is received from upper or lower layer (card), the complete dsp
140 * module is locked by a global lock. This lock MUST lock irq, because it
141 * must lock timer events by DSP poll timer.
142 * When data is ready to be transmitted down, the data is queued and sent
143 * outside lock and timer event.
144 * PH_CONTROL must not change any settings, join or split conference members
145 * during process of data.
146 *
147 * HDLC:
148 *
149 * It works quite the same as transparent, except that HDLC data is forwarded
150 * to all other conference members if no hardware bridging is possible.
151 * Send data will be writte to sendq. Sendq will be sent if confirm is received.
152 * Conference cannot join, if one member is not hdlc.
153 *
154 */
155
156#include <linux/delay.h>
5a0e3ad6 157#include <linux/gfp.h>
960366cf
KK		 158#include <linux/mISDNif.h>
159#include <linux/mISDNdsp.h>
160#include <linux/module.h>
161#include <linux/vmalloc.h>
162#include "core.h"
163#include "dsp.h"
164
5b834354 165static const char *mISDN_dsp_revision = "2.0";
960366cf
KK		 166
167static int debug;
168static int options;
169static int poll;
170static int dtmfthreshold = 100;
171
172MODULE_AUTHOR("Andreas Eversberg");
173module_param(debug, uint, S_IRUGO | S_IWUSR);
174module_param(options, uint, S_IRUGO | S_IWUSR);
175module_param(poll, uint, S_IRUGO | S_IWUSR);
176module_param(dtmfthreshold, uint, S_IRUGO | S_IWUSR);
177MODULE_LICENSE("GPL");
178
179/*int spinnest = 0;*/
180
181spinlock_t dsp_lock; /* global dsp lock */
182struct list_head dsp_ilist;
183struct list_head conf_ilist;
184int dsp_debug;
185int dsp_options;
186int dsp_poll, dsp_tics;
187
188/* check if rx may be turned off or must be turned on */
189static void
190dsp_rx_off_member(struct dsp *dsp)
191{
192 struct mISDN_ctrl_req cq;
193 int rx_off = 1;
194
8dd2f36f
AE		 195 memset(&cq, 0, sizeof(cq));
196
960366cf
KK		 197 if (!dsp->features_rx_off)
198 return;
199
200 /* not disabled */
201 if (!dsp->rx_disabled)
202 rx_off = 0;
203 /* software dtmf */
204 else if (dsp->dtmf.software)
205 rx_off = 0;
206 /* echo in software */
bc138ec4 207 else if (dsp->echo.software)
960366cf
KK		 208 rx_off = 0;
209 /* bridge in software */
bc138ec4
AE		 210 else if (dsp->conf && dsp->conf->software)
211 rx_off = 0;
212 /* data is not required by user space and not required
213 * for echo dtmf detection, soft-echo, soft-bridging */
960366cf
KK		 214
215 if (rx_off == dsp->rx_is_off)
216 return;
217
218 if (!dsp->ch.peer) {
219 if (dsp_debug & DEBUG_DSP_CORE)
220 printk(KERN_DEBUG "%s: no peer, no rx_off\n",
475be4d8 221 __func__);
960366cf
KK		 222 return;
223 }
224 cq.op = MISDN_CTRL_RX_OFF;
225 cq.p1 = rx_off;
226 if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
227 printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
475be4d8 228 __func__);
960366cf
KK		 229 return;
230 }
231 dsp->rx_is_off = rx_off;
232 if (dsp_debug & DEBUG_DSP_CORE)
233 printk(KERN_DEBUG "%s: %s set rx_off = %d\n",
475be4d8 234 __func__, dsp->name, rx_off);
960366cf
KK		 235}
236static void
237dsp_rx_off(struct dsp *dsp)
238{
239 struct dsp_conf_member *member;
240
241 if (dsp_options & DSP_OPT_NOHARDWARE)
242 return;
243
244 /* no conf */
245 if (!dsp->conf) {
246 dsp_rx_off_member(dsp);
247 return;
248 }
249 /* check all members in conf */
250 list_for_each_entry(member, &dsp->conf->mlist, list) {
251 dsp_rx_off_member(member->dsp);
252 }
253}
254
8dd2f36f
AE		 255/* enable "fill empty" feature */
256static void
257dsp_fill_empty(struct dsp *dsp)
258{
259 struct mISDN_ctrl_req cq;
260
261 memset(&cq, 0, sizeof(cq));
262
263 if (!dsp->ch.peer) {
264 if (dsp_debug & DEBUG_DSP_CORE)
265 printk(KERN_DEBUG "%s: no peer, no fill_empty\n",
475be4d8 266 __func__);
8dd2f36f
AE		 267 return;
268 }
269 cq.op = MISDN_CTRL_FILL_EMPTY;
270 cq.p1 = 1;
6d1ee48f 271 cq.p2 = dsp_silence;
8dd2f36f
AE		 272 if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
273 printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
475be4d8 274 __func__);
8dd2f36f
AE		 275 return;
276 }
277 if (dsp_debug & DEBUG_DSP_CORE)
278 printk(KERN_DEBUG "%s: %s set fill_empty = 1\n",
475be4d8 279 __func__, dsp->name);
8dd2f36f
AE		 280}
281
960366cf
KK		 282static int
283dsp_control_req(struct dsp *dsp, struct mISDNhead *hh, struct sk_buff *skb)
284{
eac74af9 285 struct sk_buff *nskb;
960366cf
KK		 286 int ret = 0;
287 int cont;
288 u8 *data;
289 int len;
290
0d63c27d 291 if (skb->len < sizeof(int)) {
960366cf 292 printk(KERN_ERR "%s: PH_CONTROL message too short\n", __func__);
0d63c27d
DC		 293 return -EINVAL;
294 }
960366cf
KK		 295 cont = *((int *)skb->data);
296 len = skb->len - sizeof(int);
297 data = skb->data + sizeof(int);
298
299 switch (cont) {
300 case DTMF_TONE_START: /* turn on DTMF */
301 if (dsp->hdlc) {
302 ret = -EINVAL;
303 break;
304 }
305 if (dsp_debug & DEBUG_DSP_CORE)
306 printk(KERN_DEBUG "%s: start dtmf\n", __func__);
307 if (len == sizeof(int)) {
c6a2e587
AE		 308 if (dsp_debug & DEBUG_DSP_CORE)
309 printk(KERN_NOTICE "changing DTMF Threshold "
475be4d8 310 "to %d\n", *((int *)data));
960366cf
KK		 311 dsp->dtmf.treshold = (*(int *)data) * 10000;
312 }
b0579d74 313 dsp->dtmf.enable = 1;
960366cf
KK		 314 /* init goertzel */
315 dsp_dtmf_goertzel_init(dsp);
316
317 /* check dtmf hardware */
318 dsp_dtmf_hardware(dsp);
b5df5a5c 319 dsp_rx_off(dsp);
960366cf
KK		 320 break;
321 case DTMF_TONE_STOP: /* turn off DTMF */
322 if (dsp_debug & DEBUG_DSP_CORE)
323 printk(KERN_DEBUG "%s: stop dtmf\n", __func__);
b0579d74 324 dsp->dtmf.enable = 0;
960366cf
KK		 325 dsp->dtmf.hardware = 0;
326 dsp->dtmf.software = 0;
327 break;
328 case DSP_CONF_JOIN: /* join / update conference */
329 if (len < sizeof(int)) {
330 ret = -EINVAL;
331 break;
332 }
333 if (*((u32 *)data) == 0)
334 goto conf_split;
335 if (dsp_debug & DEBUG_DSP_CORE)
336 printk(KERN_DEBUG "%s: join conference %d\n",
475be4d8 337 __func__, *((u32 *)data));
960366cf 338 ret = dsp_cmx_conf(dsp, *((u32 *)data));
475be4d8 339 /* dsp_cmx_hardware will also be called here */
960366cf
KK		 340 dsp_rx_off(dsp);
341 if (dsp_debug & DEBUG_DSP_CMX)
342 dsp_cmx_debug(dsp);
343 break;
344 case DSP_CONF_SPLIT: /* remove from conference */
475be4d8 345 conf_split:
960366cf
KK		 346 if (dsp_debug & DEBUG_DSP_CORE)
347 printk(KERN_DEBUG "%s: release conference\n", __func__);
348 ret = dsp_cmx_conf(dsp, 0);
475be4d8 349 /* dsp_cmx_hardware will also be called here */
960366cf
KK		 350 if (dsp_debug & DEBUG_DSP_CMX)
351 dsp_cmx_debug(dsp);
352 dsp_rx_off(dsp);
353 break;
354 case DSP_TONE_PATT_ON: /* play tone */
355 if (dsp->hdlc) {
356 ret = -EINVAL;
357 break;
358 }
359 if (len < sizeof(int)) {
360 ret = -EINVAL;
361 break;
362 }
363 if (dsp_debug & DEBUG_DSP_CORE)
364 printk(KERN_DEBUG "%s: turn tone 0x%x on\n",
475be4d8 365 __func__, *((int *)skb->data));
960366cf
KK		 366 ret = dsp_tone(dsp, *((int *)data));
367 if (!ret) {
368 dsp_cmx_hardware(dsp->conf, dsp);
369 dsp_rx_off(dsp);
370 }
371 if (!dsp->tone.tone)
372 goto tone_off;
373 break;
374 case DSP_TONE_PATT_OFF: /* stop tone */
375 if (dsp->hdlc) {
376 ret = -EINVAL;
377 break;
378 }
379 if (dsp_debug & DEBUG_DSP_CORE)
380 printk(KERN_DEBUG "%s: turn tone off\n", __func__);
381 dsp_tone(dsp, 0);
382 dsp_cmx_hardware(dsp->conf, dsp);
383 dsp_rx_off(dsp);
384 /* reset tx buffers (user space data) */
475be4d8 385 tone_off:
960366cf
KK		 386 dsp->rx_W = 0;
387 dsp->rx_R = 0;
388 break;
389 case DSP_VOL_CHANGE_TX: /* change volume */
390 if (dsp->hdlc) {
391 ret = -EINVAL;
392 break;
393 }
394 if (len < sizeof(int)) {
395 ret = -EINVAL;
396 break;
397 }
398 dsp->tx_volume = *((int *)data);
399 if (dsp_debug & DEBUG_DSP_CORE)
400 printk(KERN_DEBUG "%s: change tx vol to %d\n",
475be4d8 401 __func__, dsp->tx_volume);
960366cf
KK		 402 dsp_cmx_hardware(dsp->conf, dsp);
403 dsp_dtmf_hardware(dsp);
404 dsp_rx_off(dsp);
405 break;
406 case DSP_VOL_CHANGE_RX: /* change volume */
407 if (dsp->hdlc) {
408 ret = -EINVAL;
409 break;
410 }
411 if (len < sizeof(int)) {
412 ret = -EINVAL;
413 break;
414 }
415 dsp->rx_volume = *((int *)data);
416 if (dsp_debug & DEBUG_DSP_CORE)
417 printk(KERN_DEBUG "%s: change rx vol to %d\n",
475be4d8 418 __func__, dsp->tx_volume);
960366cf
KK		 419 dsp_cmx_hardware(dsp->conf, dsp);
420 dsp_dtmf_hardware(dsp);
421 dsp_rx_off(dsp);
422 break;
423 case DSP_ECHO_ON: /* enable echo */
bc138ec4 424 dsp->echo.software = 1; /* soft echo */
960366cf
KK		 425 if (dsp_debug & DEBUG_DSP_CORE)
426 printk(KERN_DEBUG "%s: enable cmx-echo\n", __func__);
427 dsp_cmx_hardware(dsp->conf, dsp);
428 dsp_rx_off(dsp);
429 if (dsp_debug & DEBUG_DSP_CMX)
430 dsp_cmx_debug(dsp);
431 break;
432 case DSP_ECHO_OFF: /* disable echo */
bc138ec4
AE		 433 dsp->echo.software = 0;
434 dsp->echo.hardware = 0;
960366cf
KK		 435 if (dsp_debug & DEBUG_DSP_CORE)
436 printk(KERN_DEBUG "%s: disable cmx-echo\n", __func__);
437 dsp_cmx_hardware(dsp->conf, dsp);
438 dsp_rx_off(dsp);
439 if (dsp_debug & DEBUG_DSP_CMX)
440 dsp_cmx_debug(dsp);
441 break;
442 case DSP_RECEIVE_ON: /* enable receive to user space */
443 if (dsp_debug & DEBUG_DSP_CORE)
444 printk(KERN_DEBUG "%s: enable receive to user "
475be4d8 445 "space\n", __func__);
960366cf
KK		 446 dsp->rx_disabled = 0;
447 dsp_rx_off(dsp);
448 break;
449 case DSP_RECEIVE_OFF: /* disable receive to user space */
450 if (dsp_debug & DEBUG_DSP_CORE)
451 printk(KERN_DEBUG "%s: disable receive to "
475be4d8 452 "user space\n", __func__);
960366cf
KK		 453 dsp->rx_disabled = 1;
454 dsp_rx_off(dsp);
455 break;
456 case DSP_MIX_ON: /* enable mixing of tx data */
457 if (dsp->hdlc) {
458 ret = -EINVAL;
459 break;
460 }
461 if (dsp_debug & DEBUG_DSP_CORE)
462 printk(KERN_DEBUG "%s: enable mixing of "
d939be3a 463 "tx-data with conf members\n", __func__);
960366cf
KK		 464 dsp->tx_mix = 1;
465 dsp_cmx_hardware(dsp->conf, dsp);
466 dsp_rx_off(dsp);
467 if (dsp_debug & DEBUG_DSP_CMX)
468 dsp_cmx_debug(dsp);
469 break;
470 case DSP_MIX_OFF: /* disable mixing of tx data */
471 if (dsp->hdlc) {
472 ret = -EINVAL;
473 break;
474 }
475 if (dsp_debug & DEBUG_DSP_CORE)
476 printk(KERN_DEBUG "%s: disable mixing of "
d939be3a 477 "tx-data with conf members\n", __func__);
960366cf
KK		 478 dsp->tx_mix = 0;
479 dsp_cmx_hardware(dsp->conf, dsp);
480 dsp_rx_off(dsp);
481 if (dsp_debug & DEBUG_DSP_CMX)
482 dsp_cmx_debug(dsp);
483 break;
484 case DSP_TXDATA_ON: /* enable txdata */
485 dsp->tx_data = 1;
486 if (dsp_debug & DEBUG_DSP_CORE)
487 printk(KERN_DEBUG "%s: enable tx-data\n", __func__);
488 dsp_cmx_hardware(dsp->conf, dsp);
489 dsp_rx_off(dsp);
490 if (dsp_debug & DEBUG_DSP_CMX)
491 dsp_cmx_debug(dsp);
492 break;
493 case DSP_TXDATA_OFF: /* disable txdata */
494 dsp->tx_data = 0;
495 if (dsp_debug & DEBUG_DSP_CORE)
496 printk(KERN_DEBUG "%s: disable tx-data\n", __func__);
497 dsp_cmx_hardware(dsp->conf, dsp);
498 dsp_rx_off(dsp);
499 if (dsp_debug & DEBUG_DSP_CMX)
500 dsp_cmx_debug(dsp);
501 break;
502 case DSP_DELAY: /* use delay algorithm instead of dynamic
503 jitter algorithm */
504 if (dsp->hdlc) {
505 ret = -EINVAL;
506 break;
507 }
508 if (len < sizeof(int)) {
509 ret = -EINVAL;
510 break;
511 }
512 dsp->cmx_delay = (*((int *)data)) << 3;
475be4d8
JP		 513 /* milliseconds to samples */
514 if (dsp->cmx_delay >= (CMX_BUFF_HALF >> 1))
960366cf 515 /* clip to half of maximum usable buffer
475be4d8
JP		 516 (half of half buffer) */
517 dsp->cmx_delay = (CMX_BUFF_HALF >> 1) - 1;
960366cf
KK		 518 if (dsp_debug & DEBUG_DSP_CORE)
519 printk(KERN_DEBUG "%s: use delay algorithm to "
475be4d8
JP		 520 "compensate jitter (%d samples)\n",
521 __func__, dsp->cmx_delay);
960366cf
KK		 522 break;
523 case DSP_JITTER: /* use dynamic jitter algorithm instead of
475be4d8 524 delay algorithm */
960366cf
KK		 525 if (dsp->hdlc) {
526 ret = -EINVAL;
527 break;
528 }
529 dsp->cmx_delay = 0;
530 if (dsp_debug & DEBUG_DSP_CORE)
531 printk(KERN_DEBUG "%s: use jitter algorithm to "
475be4d8 532 "compensate jitter\n", __func__);
960366cf
KK		 533 break;
534 case DSP_TX_DEJITTER: /* use dynamic jitter algorithm for tx-buffer */
535 if (dsp->hdlc) {
536 ret = -EINVAL;
537 break;
538 }
539 dsp->tx_dejitter = 1;
540 if (dsp_debug & DEBUG_DSP_CORE)
541 printk(KERN_DEBUG "%s: use dejitter on TX "
475be4d8 542 "buffer\n", __func__);
960366cf
KK		 543 break;
544 case DSP_TX_DEJ_OFF: /* use tx-buffer without dejittering*/
545 if (dsp->hdlc) {
546 ret = -EINVAL;
547 break;
548 }
549 dsp->tx_dejitter = 0;
550 if (dsp_debug & DEBUG_DSP_CORE)
551 printk(KERN_DEBUG "%s: use TX buffer without "
475be4d8 552 "dejittering\n", __func__);
960366cf
KK		 553 break;
554 case DSP_PIPELINE_CFG:
555 if (dsp->hdlc) {
556 ret = -EINVAL;
557 break;
558 }
559 if (len > 0 && ((char *)data)[len - 1]) {
560 printk(KERN_DEBUG "%s: pipeline config string "
475be4d8 561 "is not NULL terminated!\n", __func__);
960366cf
KK		 562 ret = -EINVAL;
563 } else {
564 dsp->pipeline.inuse = 1;
565 dsp_cmx_hardware(dsp->conf, dsp);
566 ret = dsp_pipeline_build(&dsp->pipeline,
475be4d8 567 len > 0 ? data : NULL);
960366cf
KK		 568 dsp_cmx_hardware(dsp->conf, dsp);
569 dsp_rx_off(dsp);
570 }
571 break;
572 case DSP_BF_ENABLE_KEY: /* turn blowfish on */
573 if (dsp->hdlc) {
574 ret = -EINVAL;
575 break;
576 }
577 if (len < 4 || len > 56) {
578 ret = -EINVAL;
579 break;
580 }
581 if (dsp_debug & DEBUG_DSP_CORE)
582 printk(KERN_DEBUG "%s: turn blowfish on (key "
475be4d8 583 "not shown)\n", __func__);
960366cf
KK		 584 ret = dsp_bf_init(dsp, (u8 *)data, len);
585 /* set new cont */
586 if (!ret)
587 cont = DSP_BF_ACCEPT;
588 else
589 cont = DSP_BF_REJECT;
590 /* send indication if it worked to set it */
591 nskb = _alloc_mISDN_skb(PH_CONTROL_IND, MISDN_ID_ANY,
475be4d8 592 sizeof(int), &cont, GFP_ATOMIC);
960366cf
KK		 593 if (nskb) {
594 if (dsp->up) {
595 if (dsp->up->send(dsp->up, nskb))
596 dev_kfree_skb(nskb);
597 } else
598 dev_kfree_skb(nskb);
599 }
600 if (!ret) {
601 dsp_cmx_hardware(dsp->conf, dsp);
602 dsp_dtmf_hardware(dsp);
603 dsp_rx_off(dsp);
604 }
605 break;
606 case DSP_BF_DISABLE: /* turn blowfish off */
607 if (dsp->hdlc) {
608 ret = -EINVAL;
609 break;
610 }
611 if (dsp_debug & DEBUG_DSP_CORE)
612 printk(KERN_DEBUG "%s: turn blowfish off\n", __func__);
613 dsp_bf_cleanup(dsp);
614 dsp_cmx_hardware(dsp->conf, dsp);
615 dsp_dtmf_hardware(dsp);
616 dsp_rx_off(dsp);
617 break;
618 default:
619 if (dsp_debug & DEBUG_DSP_CORE)
620 printk(KERN_DEBUG "%s: ctrl req %x unhandled\n",
475be4d8 621 __func__, cont);
960366cf
KK		 622 ret = -EINVAL;
623 }
624 return ret;
625}
626
627static void
628get_features(struct mISDNchannel *ch)
629{
630 struct dsp *dsp = container_of(ch, struct dsp, ch);
631 struct mISDN_ctrl_req cq;
632
960366cf
KK		 633 if (!ch->peer) {
634 if (dsp_debug & DEBUG_DSP_CORE)
635 printk(KERN_DEBUG "%s: no peer, no features\n",
475be4d8 636 __func__);
960366cf
KK		 637 return;
638 }
639 memset(&cq, 0, sizeof(cq));
640 cq.op = MISDN_CTRL_GETOP;
641 if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq) < 0) {
642 printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
475be4d8 643 __func__);
960366cf
KK		 644 return;
645 }
646 if (cq.op & MISDN_CTRL_RX_OFF)
647 dsp->features_rx_off = 1;
8dd2f36f
AE		 648 if (cq.op & MISDN_CTRL_FILL_EMPTY)
649 dsp->features_fill_empty = 1;
650 if (dsp_options & DSP_OPT_NOHARDWARE)
651 return;
960366cf
KK		 652 if ((cq.op & MISDN_CTRL_HW_FEATURES_OP)) {
653 cq.op = MISDN_CTRL_HW_FEATURES;
654 *((u_long *)&cq.p1) = (u_long)&dsp->features;
655 if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq)) {
656 printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
475be4d8 657 __func__);
960366cf
KK		 658 }
659 } else
660 if (dsp_debug & DEBUG_DSP_CORE)
661 printk(KERN_DEBUG "%s: features not supported for %s\n",
475be4d8 662 __func__, dsp->name);
960366cf
KK		 663}
664
665static int
666dsp_function(struct mISDNchannel *ch, struct sk_buff *skb)
667{
b5df5a5c 668 struct dsp *dsp = container_of(ch, struct dsp, ch);
960366cf
KK		 669 struct mISDNhead *hh;
670 int ret = 0;
b5df5a5c 671 u8 *digits = NULL;
960366cf
KK		 672 u_long flags;
673
674 hh = mISDN_HEAD_P(skb);
675 switch (hh->prim) {
475be4d8 676 /* FROM DOWN */
960366cf
KK		 677 case (PH_DATA_CNF):
678 dsp->data_pending = 0;
679 /* trigger next hdlc frame, if any */
680 if (dsp->hdlc) {
681 spin_lock_irqsave(&dsp_lock, flags);
682 if (dsp->b_active)
683 schedule_work(&dsp->workq);
684 spin_unlock_irqrestore(&dsp_lock, flags);
685 }
686 break;
687 case (PH_DATA_IND):
688 case (DL_DATA_IND):
689 if (skb->len < 1) {
690 ret = -EINVAL;
691 break;
692 }
693 if (dsp->rx_is_off) {
694 if (dsp_debug & DEBUG_DSP_CORE)
695 printk(KERN_DEBUG "%s: rx-data during rx_off"
475be4d8
JP		 696 " for %s\n",
697 __func__, dsp->name);
960366cf
KK		 698 }
699 if (dsp->hdlc) {
700 /* hdlc */
701 spin_lock_irqsave(&dsp_lock, flags);
702 dsp_cmx_hdlc(dsp, skb);
703 spin_unlock_irqrestore(&dsp_lock, flags);
704 if (dsp->rx_disabled) {
705 /* if receive is not allowed */
706 break;
707 }
708 hh->prim = DL_DATA_IND;
709 if (dsp->up)
710 return dsp->up->send(dsp->up, skb);
711 break;
712 }
713
ba3af34e
AE		 714 spin_lock_irqsave(&dsp_lock, flags);
715
960366cf
KK		 716 /* decrypt if enabled */
717 if (dsp->bf_enable)
718 dsp_bf_decrypt(dsp, skb->data, skb->len);
719 /* pipeline */
720 if (dsp->pipeline.inuse)
721 dsp_pipeline_process_rx(&dsp->pipeline, skb->data,
475be4d8 722 skb->len, hh->id);
960366cf
KK		 723 /* change volume if requested */
724 if (dsp->rx_volume)
725 dsp_change_volume(skb, dsp->rx_volume);
960366cf
KK		 726 /* check if dtmf soft decoding is turned on */
727 if (dsp->dtmf.software) {
728 digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
475be4d8 729 skb->len, (dsp_options & DSP_OPT_ULAW) ? 1 : 0);
b5df5a5c
AE		 730 }
731 /* we need to process receive data if software */
bc138ec4 732 if (dsp->conf && dsp->conf->software) {
b5df5a5c
AE		 733 /* process data from card at cmx */
734 dsp_cmx_receive(dsp, skb);
735 }
736
737 spin_unlock_irqrestore(&dsp_lock, flags);
738
739 /* send dtmf result, if any */
740 if (digits) {
960366cf 741 while (*digits) {
b5df5a5c 742 int k;
bb68b1d9 743 struct sk_buff *nskb;
960366cf
KK		 744 if (dsp_debug & DEBUG_DSP_DTMF)
745 printk(KERN_DEBUG "%s: digit"
475be4d8
JP		 746 "(%c) to layer %s\n",
747 __func__, *digits, dsp->name);
b5df5a5c 748 k = *digits | DTMF_TONE_VAL;
960366cf 749 nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
475be4d8
JP		 750 MISDN_ID_ANY, sizeof(int), &k,
751 GFP_ATOMIC);
960366cf
KK		 752 if (nskb) {
753 if (dsp->up) {
754 if (dsp->up->send(
475be4d8 755 dsp->up, nskb))
b5df5a5c 756 dev_kfree_skb(nskb);
960366cf
KK		 757 } else
758 dev_kfree_skb(nskb);
759 }
760 digits++;
761 }
762 }
960366cf
KK		 763 if (dsp->rx_disabled) {
764 /* if receive is not allowed */
765 break;
766 }
767 hh->prim = DL_DATA_IND;
768 if (dsp->up)
769 return dsp->up->send(dsp->up, skb);
770 break;
771 case (PH_CONTROL_IND):
772 if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
773 printk(KERN_DEBUG "%s: PH_CONTROL INDICATION "
475be4d8
JP		 774 "received: %x (len %d) %s\n", __func__,
775 hh->id, skb->len, dsp->name);
960366cf
KK		 776 switch (hh->id) {
777 case (DTMF_HFC_COEF): /* getting coefficients */
778 if (!dsp->dtmf.hardware) {
779 if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
780 printk(KERN_DEBUG "%s: ignoring DTMF "
475be4d8
JP		 781 "coefficients from HFC\n",
782 __func__);
960366cf
KK		 783 break;
784 }
785 digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
475be4d8 786 skb->len, 2);
960366cf
KK		 787 while (*digits) {
788 int k;
789 struct sk_buff *nskb;
790 if (dsp_debug & DEBUG_DSP_DTMF)
791 printk(KERN_DEBUG "%s: digit"
475be4d8
JP		 792 "(%c) to layer %s\n",
793 __func__, *digits, dsp->name);
960366cf
KK		 794 k = *digits | DTMF_TONE_VAL;
795 nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
475be4d8
JP		 796 MISDN_ID_ANY, sizeof(int), &k,
797 GFP_ATOMIC);
960366cf
KK		 798 if (nskb) {
799 if (dsp->up) {
800 if (dsp->up->send(
475be4d8 801 dsp->up, nskb))
b5df5a5c 802 dev_kfree_skb(nskb);
960366cf
KK		 803 } else
804 dev_kfree_skb(nskb);
805 }
806 digits++;
807 }
808 break;
809 case (HFC_VOL_CHANGE_TX): /* change volume */
810 if (skb->len != sizeof(int)) {
811 ret = -EINVAL;
812 break;
813 }
814 spin_lock_irqsave(&dsp_lock, flags);
815 dsp->tx_volume = *((int *)skb->data);
816 if (dsp_debug & DEBUG_DSP_CORE)
817 printk(KERN_DEBUG "%s: change tx volume to "
475be4d8 818 "%d\n", __func__, dsp->tx_volume);
960366cf
KK		 819 dsp_cmx_hardware(dsp->conf, dsp);
820 dsp_dtmf_hardware(dsp);
821 dsp_rx_off(dsp);
822 spin_unlock_irqrestore(&dsp_lock, flags);
823 break;
824 default:
825 if (dsp_debug & DEBUG_DSP_CORE)
826 printk(KERN_DEBUG "%s: ctrl ind %x unhandled "
475be4d8 827 "%s\n", __func__, hh->id, dsp->name);
960366cf
KK		 828 ret = -EINVAL;
829 }
830 break;
831 case (PH_ACTIVATE_IND):
832 case (PH_ACTIVATE_CNF):
833 if (dsp_debug & DEBUG_DSP_CORE)
834 printk(KERN_DEBUG "%s: b_channel is now active %s\n",
475be4d8 835 __func__, dsp->name);
960366cf
KK		 836 /* bchannel now active */
837 spin_lock_irqsave(&dsp_lock, flags);
838 dsp->b_active = 1;
839 dsp->data_pending = 0;
840 dsp->rx_init = 1;
475be4d8 841 /* rx_W and rx_R will be adjusted on first frame */
960366cf
KK		 842 dsp->rx_W = 0;
843 dsp->rx_R = 0;
844 memset(dsp->rx_buff, 0, sizeof(dsp->rx_buff));
845 dsp_cmx_hardware(dsp->conf, dsp);
846 dsp_dtmf_hardware(dsp);
847 dsp_rx_off(dsp);
848 spin_unlock_irqrestore(&dsp_lock, flags);
849 if (dsp_debug & DEBUG_DSP_CORE)
850 printk(KERN_DEBUG "%s: done with activation, sending "
475be4d8
JP		 851 "confirm to user space. %s\n", __func__,
852 dsp->name);
960366cf
KK		 853 /* send activation to upper layer */
854 hh->prim = DL_ESTABLISH_CNF;
855 if (dsp->up)
856 return dsp->up->send(dsp->up, skb);
857 break;
858 case (PH_DEACTIVATE_IND):
859 case (PH_DEACTIVATE_CNF):
860 if (dsp_debug & DEBUG_DSP_CORE)
861 printk(KERN_DEBUG "%s: b_channel is now inactive %s\n",
475be4d8 862 __func__, dsp->name);
960366cf
KK		 863 /* bchannel now inactive */
864 spin_lock_irqsave(&dsp_lock, flags);
865 dsp->b_active = 0;
866 dsp->data_pending = 0;
867 dsp_cmx_hardware(dsp->conf, dsp);
868 dsp_rx_off(dsp);
869 spin_unlock_irqrestore(&dsp_lock, flags);
870 hh->prim = DL_RELEASE_CNF;
871 if (dsp->up)
872 return dsp->up->send(dsp->up, skb);
873 break;
475be4d8 874 /* FROM UP */
960366cf
KK		 875 case (DL_DATA_REQ):
876 case (PH_DATA_REQ):
877 if (skb->len < 1) {
878 ret = -EINVAL;
879 break;
880 }
881 if (dsp->hdlc) {
882 /* hdlc */
e4cce225
PS		 883 if (!dsp->b_active) {
884 ret = -EIO;
885 break;
960366cf 886 }
e4cce225
PS		 887 hh->prim = PH_DATA_REQ;
888 spin_lock_irqsave(&dsp_lock, flags);
889 skb_queue_tail(&dsp->sendq, skb);
890 schedule_work(&dsp->workq);
960366cf
KK		 891 spin_unlock_irqrestore(&dsp_lock, flags);
892 return 0;
893 }
894 /* send data to tx-buffer (if no tone is played) */
895 if (!dsp->tone.tone) {
896 spin_lock_irqsave(&dsp_lock, flags);
897 dsp_cmx_transmit(dsp, skb);
898 spin_unlock_irqrestore(&dsp_lock, flags);
899 }
900 break;
901 case (PH_CONTROL_REQ):
902 spin_lock_irqsave(&dsp_lock, flags);
903 ret = dsp_control_req(dsp, hh, skb);
904 spin_unlock_irqrestore(&dsp_lock, flags);
905 break;
906 case (DL_ESTABLISH_REQ):
907 case (PH_ACTIVATE_REQ):
908 if (dsp_debug & DEBUG_DSP_CORE)
909 printk(KERN_DEBUG "%s: activating b_channel %s\n",
475be4d8 910 __func__, dsp->name);
960366cf
KK		 911 if (dsp->dtmf.hardware || dsp->dtmf.software)
912 dsp_dtmf_goertzel_init(dsp);
913 get_features(ch);
8dd2f36f
AE		 914 /* enable fill_empty feature */
915 if (dsp->features_fill_empty)
916 dsp_fill_empty(dsp);
960366cf
KK		 917 /* send ph_activate */
918 hh->prim = PH_ACTIVATE_REQ;
919 if (ch->peer)
920 return ch->recv(ch->peer, skb);
921 break;
922 case (DL_RELEASE_REQ):
923 case (PH_DEACTIVATE_REQ):
924 if (dsp_debug & DEBUG_DSP_CORE)
925 printk(KERN_DEBUG "%s: releasing b_channel %s\n",
475be4d8 926 __func__, dsp->name);
960366cf
KK		 927 spin_lock_irqsave(&dsp_lock, flags);
928 dsp->tone.tone = 0;
929 dsp->tone.hardware = 0;
930 dsp->tone.software = 0;
931 if (timer_pending(&dsp->tone.tl))
932 del_timer(&dsp->tone.tl);
933 if (dsp->conf)
934 dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be
935 called here */
936 skb_queue_purge(&dsp->sendq);
937 spin_unlock_irqrestore(&dsp_lock, flags);
938 hh->prim = PH_DEACTIVATE_REQ;
939 if (ch->peer)
940 return ch->recv(ch->peer, skb);
941 break;
942 default:
943 if (dsp_debug & DEBUG_DSP_CORE)
944 printk(KERN_DEBUG "%s: msg %x unhandled %s\n",
475be4d8 945 __func__, hh->prim, dsp->name);
960366cf
KK		 946 ret = -EINVAL;
947 }
948 if (!ret)
949 dev_kfree_skb(skb);
950 return ret;
951}
952
953static int
954dsp_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
955{
956 struct dsp *dsp = container_of(ch, struct dsp, ch);
957 u_long flags;
958 int err = 0;
959
960 if (debug & DEBUG_DSP_CTRL)
eac74af9 961 printk(KERN_DEBUG "%s:(%x)\n", __func__, cmd);
960366cf
KK		 962
963 switch (cmd) {
964 case OPEN_CHANNEL:
965 break;
966 case CLOSE_CHANNEL:
967 if (dsp->ch.peer)
968 dsp->ch.peer->ctrl(dsp->ch.peer, CLOSE_CHANNEL, NULL);
969
970 /* wait until workqueue has finished,
971 * must lock here, or we may hit send-process currently
972 * queueing. */
973 spin_lock_irqsave(&dsp_lock, flags);
974 dsp->b_active = 0;
975 spin_unlock_irqrestore(&dsp_lock, flags);
976 /* MUST not be locked, because it waits until queue is done. */
977 cancel_work_sync(&dsp->workq);
978 spin_lock_irqsave(&dsp_lock, flags);
979 if (timer_pending(&dsp->tone.tl))
980 del_timer(&dsp->tone.tl);
981 skb_queue_purge(&dsp->sendq);
982 if (dsp_debug & DEBUG_DSP_CTRL)
983 printk(KERN_DEBUG "%s: releasing member %s\n",
475be4d8 984 __func__, dsp->name);
960366cf
KK		 985 dsp->b_active = 0;
986 dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be called
987 here */
988 dsp_pipeline_destroy(&dsp->pipeline);
989
990 if (dsp_debug & DEBUG_DSP_CTRL)
991 printk(KERN_DEBUG "%s: remove & destroy object %s\n",
475be4d8 992 __func__, dsp->name);
960366cf
KK		 993 list_del(&dsp->list);
994 spin_unlock_irqrestore(&dsp_lock, flags);
995
996 if (dsp_debug & DEBUG_DSP_CTRL)
997 printk(KERN_DEBUG "%s: dsp instance released\n",
475be4d8 998 __func__);
960366cf
KK		 999 vfree(dsp);
1000 module_put(THIS_MODULE);
1001 break;
1002 }
1003 return err;
1004}
1005
1006static void
1007dsp_send_bh(struct work_struct *work)
1008{
1009 struct dsp *dsp = container_of(work, struct dsp, workq);
1010 struct sk_buff *skb;
1011 struct mISDNhead *hh;
1012
1013 if (dsp->hdlc && dsp->data_pending)
1014 return; /* wait until data has been acknowledged */
1015
1016 /* send queued data */
1017 while ((skb = skb_dequeue(&dsp->sendq))) {
1018 /* in locked date, we must have still data in queue */
1019 if (dsp->data_pending) {
1020 if (dsp_debug & DEBUG_DSP_CORE)
1021 printk(KERN_DEBUG "%s: fifo full %s, this is "
475be4d8 1022 "no bug!\n", __func__, dsp->name);
960366cf
KK		 1023 /* flush transparent data, if not acked */
1024 dev_kfree_skb(skb);
1025 continue;
1026 }
1027 hh = mISDN_HEAD_P(skb);
1028 if (hh->prim == DL_DATA_REQ) {
1029 /* send packet up */
1030 if (dsp->up) {
1031 if (dsp->up->send(dsp->up, skb))
1032 dev_kfree_skb(skb);
1033 } else
1034 dev_kfree_skb(skb);
1035 } else {
1036 /* send packet down */
1037 if (dsp->ch.peer) {
1038 dsp->data_pending = 1;
1039 if (dsp->ch.recv(dsp->ch.peer, skb)) {
1040 dev_kfree_skb(skb);
1041 dsp->data_pending = 0;
1042 }
1043 } else
1044 dev_kfree_skb(skb);
1045 }
1046 }
1047}
1048
1049static int
1050dspcreate(struct channel_req *crq)
1051{
1052 struct dsp *ndsp;
1053 u_long flags;
1054
1055 if (crq->protocol != ISDN_P_B_L2DSP
475be4d8 1056 && crq->protocol != ISDN_P_B_L2DSPHDLC)
960366cf 1057 return -EPROTONOSUPPORT;
1ac4594d 1058 ndsp = vzalloc(sizeof(struct dsp));
960366cf
KK		 1059 if (!ndsp) {
1060 printk(KERN_ERR "%s: vmalloc struct dsp failed\n", __func__);
1061 return -ENOMEM;
1062 }
960366cf
KK		 1063 if (dsp_debug & DEBUG_DSP_CTRL)
1064 printk(KERN_DEBUG "%s: creating new dsp instance\n", __func__);
1065
1066 /* default enabled */
1067 INIT_WORK(&ndsp->workq, (void *)dsp_send_bh);
1068 skb_queue_head_init(&ndsp->sendq);
1069 ndsp->ch.send = dsp_function;
1070 ndsp->ch.ctrl = dsp_ctrl;
1071 ndsp->up = crq->ch;
1072 crq->ch = &ndsp->ch;
1073 if (crq->protocol == ISDN_P_B_L2DSP) {
1074 crq->protocol = ISDN_P_B_RAW;
1075 ndsp->hdlc = 0;
1076 } else {
1077 crq->protocol = ISDN_P_B_HDLC;
1078 ndsp->hdlc = 1;
1079 }
1080 if (!try_module_get(THIS_MODULE))
1081 printk(KERN_WARNING "%s:cannot get module\n",
475be4d8 1082 __func__);
960366cf
KK		 1083
1084 sprintf(ndsp->name, "DSP_C%x(0x%p)",
1085 ndsp->up->st->dev->id + 1, ndsp);
1086 /* set frame size to start */
1087 ndsp->features.hfc_id = -1; /* current PCM id */
1088 ndsp->features.pcm_id = -1; /* current PCM id */
1089 ndsp->pcm_slot_rx = -1; /* current CPM slot */
1090 ndsp->pcm_slot_tx = -1;
1091 ndsp->pcm_bank_rx = -1;
1092 ndsp->pcm_bank_tx = -1;
1093 ndsp->hfc_conf = -1; /* current conference number */
1094 /* set tone timer */
1095 ndsp->tone.tl.function = (void *)dsp_tone_timeout;
1096 ndsp->tone.tl.data = (long) ndsp;
1097 init_timer(&ndsp->tone.tl);
1098
1099 if (dtmfthreshold < 20 || dtmfthreshold > 500)
1100 dtmfthreshold = 200;
475be4d8 1101 ndsp->dtmf.treshold = dtmfthreshold * 10000;
960366cf
KK		 1102
1103 /* init pipeline append to list */
1104 spin_lock_irqsave(&dsp_lock, flags);
1105 dsp_pipeline_init(&ndsp->pipeline);
1106 list_add_tail(&ndsp->list, &dsp_ilist);
1107 spin_unlock_irqrestore(&dsp_lock, flags);
1108
1109 return 0;
1110}
1111
1112
1113static struct Bprotocol DSP = {
1114 .Bprotocols = (1 << (ISDN_P_B_L2DSP & ISDN_P_B_MASK))
475be4d8 1115 | (1 << (ISDN_P_B_L2DSPHDLC & ISDN_P_B_MASK)),
960366cf
KK		 1116 .name = "dsp",
1117 .create = dspcreate
1118};
1119
3d956d1d 1120static int __init dsp_init(void)
960366cf
KK		 1121{
1122 int err;
1123 int tics;
1124
4807f643 1125 printk(KERN_INFO "DSP module %s\n", mISDN_dsp_revision);
960366cf
KK		 1126
1127 dsp_options = options;
1128 dsp_debug = debug;
1129
1130 /* set packet size */
1131 dsp_poll = poll;
1132 if (dsp_poll) {
1133 if (dsp_poll > MAX_POLL) {
1134 printk(KERN_ERR "%s: Wrong poll value (%d), use %d "
475be4d8 1135 "maximum.\n", __func__, poll, MAX_POLL);
960366cf
KK		 1136 err = -EINVAL;
1137 return err;
1138 }
1139 if (dsp_poll < 8) {
1140 printk(KERN_ERR "%s: Wrong poll value (%d), use 8 "
475be4d8 1141 "minimum.\n", __func__, dsp_poll);
960366cf
KK		 1142 err = -EINVAL;
1143 return err;
1144 }
1145 dsp_tics = poll * HZ / 8000;
1146 if (dsp_tics * 8000 != poll * HZ) {
1147 printk(KERN_INFO "mISDN_dsp: Cannot clock every %d "
475be4d8
JP		 1148 "samples (0,125 ms). It is not a multiple of "
1149 "%d HZ.\n", poll, HZ);
960366cf
KK		 1150 err = -EINVAL;
1151 return err;
1152 }
1153 } else {
1154 poll = 8;
1155 while (poll <= MAX_POLL) {
400fd978 1156 tics = (poll * HZ) / 8000;
960366cf
KK		 1157 if (tics * 8000 == poll * HZ) {
1158 dsp_tics = tics;
1159 dsp_poll = poll;
1160 if (poll >= 64)
1161 break;
1162 }
1163 poll++;
1164 }
1165 }
1166 if (dsp_poll == 0) {
1167 printk(KERN_INFO "mISDN_dsp: There is no multiple of kernel "
475be4d8
JP		 1168 "clock that equals exactly the duration of 8-256 "
1169 "samples. (Choose kernel clock speed like 100, 250, "
1170 "300, 1000)\n");
960366cf
KK		 1171 err = -EINVAL;
1172 return err;
1173 }
1174 printk(KERN_INFO "mISDN_dsp: DSP clocks every %d samples. This equals "
475be4d8 1175 "%d jiffies.\n", dsp_poll, dsp_tics);
960366cf
KK		 1176
1177 spin_lock_init(&dsp_lock);
1178 INIT_LIST_HEAD(&dsp_ilist);
1179 INIT_LIST_HEAD(&conf_ilist);
1180
1181 /* init conversion tables */
1182 dsp_audio_generate_law_tables();
475be4d8
JP		 1183 dsp_silence = (dsp_options & DSP_OPT_ULAW) ? 0xff : 0x2a;
1184 dsp_audio_law_to_s32 = (dsp_options & DSP_OPT_ULAW) ?
eac74af9 1185 dsp_audio_ulaw_to_s32 : dsp_audio_alaw_to_s32;
960366cf
KK		 1186 dsp_audio_generate_s2law_table();
1187 dsp_audio_generate_seven();
1188 dsp_audio_generate_mix_table();
1189 if (dsp_options & DSP_OPT_ULAW)
1190 dsp_audio_generate_ulaw_samples();
1191 dsp_audio_generate_volume_changes();
1192
1193 err = dsp_pipeline_module_init();
1194 if (err) {
1195 printk(KERN_ERR "mISDN_dsp: Can't initialize pipeline, "
475be4d8 1196 "error(%d)\n", err);
960366cf
KK		 1197 return err;
1198 }
1199
1200 err = mISDN_register_Bprotocol(&DSP);
1201 if (err) {
1202 printk(KERN_ERR "Can't register %s error(%d)\n", DSP.name, err);
1203 return err;
1204 }
1205
1206 /* set sample timer */
1207 dsp_spl_tl.function = (void *)dsp_cmx_send;
1208 dsp_spl_tl.data = 0;
1209 init_timer(&dsp_spl_tl);
1210 dsp_spl_tl.expires = jiffies + dsp_tics;
1211 dsp_spl_jiffies = dsp_spl_tl.expires;
1212 add_timer(&dsp_spl_tl);
1213
1214 return 0;
1215}
1216
1217
3d956d1d 1218static void __exit dsp_cleanup(void)
960366cf
KK		 1219{
1220 mISDN_unregister_Bprotocol(&DSP);
1221
4a0ae7b0 1222 del_timer_sync(&dsp_spl_tl);
960366cf
KK		 1223
1224 if (!list_empty(&dsp_ilist)) {
1225 printk(KERN_ERR "mISDN_dsp: Audio DSP object inst list not "
475be4d8 1226 "empty.\n");
960366cf
KK		 1227 }
1228 if (!list_empty(&conf_ilist)) {
1229 printk(KERN_ERR "mISDN_dsp: Conference list not empty. Not "
475be4d8 1230 "all memory freed.\n");
960366cf
KK		 1231 }
1232
1233 dsp_pipeline_module_exit();
1234}
1235
1236module_init(dsp_init);
1237module_exit(dsp_cleanup);
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