Merge branch 'topic/asoc' into next/asoc
[linux-2.6] / drivers / isdn / mISDN / dsp_core.c
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  *
113  * Echo: Is generated by CMX and is used to check performane of hard and
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
118  * data to/form upper layer may be swithed on/off individually without loosing
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.
130  * Not receiving is usefull if only announcements are played. Not sending is
131  * usefull if an answering machine records audio. Not sending and receiving is
132  * usefull during most states of the call. If supported by hardware, tones
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>
157 #include <linux/mISDNif.h>
158 #include <linux/mISDNdsp.h>
159 #include <linux/module.h>
160 #include <linux/vmalloc.h>
161 #include "core.h"
162 #include "dsp.h"
163
164 static const char *mISDN_dsp_revision = "2.0";
165
166 static int debug;
167 static int options;
168 static int poll;
169 static int dtmfthreshold = 100;
170
171 MODULE_AUTHOR("Andreas Eversberg");
172 module_param(debug, uint, S_IRUGO | S_IWUSR);
173 module_param(options, uint, S_IRUGO | S_IWUSR);
174 module_param(poll, uint, S_IRUGO | S_IWUSR);
175 module_param(dtmfthreshold, uint, S_IRUGO | S_IWUSR);
176 MODULE_LICENSE("GPL");
177
178 /*int spinnest = 0;*/
179
180 spinlock_t dsp_lock; /* global dsp lock */
181 struct list_head dsp_ilist;
182 struct list_head conf_ilist;
183 int dsp_debug;
184 int dsp_options;
185 int dsp_poll, dsp_tics;
186
187 /* check if rx may be turned off or must be turned on */
188 static void
189 dsp_rx_off_member(struct dsp *dsp)
190 {
191         struct mISDN_ctrl_req   cq;
192         int rx_off = 1;
193
194         memset(&cq, 0, sizeof(cq));
195
196         if (!dsp->features_rx_off)
197                 return;
198
199         /* not disabled */
200         if (!dsp->rx_disabled)
201                 rx_off = 0;
202         /* software dtmf */
203         else if (dsp->dtmf.software)
204                 rx_off = 0;
205         /* echo in software */
206         else if (dsp->echo && dsp->pcm_slot_tx < 0)
207                 rx_off = 0;
208         /* bridge in software */
209         else if (dsp->conf) {
210                 if (dsp->conf->software)
211                         rx_off = 0;
212         }
213
214         if (rx_off == dsp->rx_is_off)
215                 return;
216
217         if (!dsp->ch.peer) {
218                 if (dsp_debug & DEBUG_DSP_CORE)
219                         printk(KERN_DEBUG "%s: no peer, no rx_off\n",
220                                 __func__);
221                 return;
222         }
223         cq.op = MISDN_CTRL_RX_OFF;
224         cq.p1 = rx_off;
225         if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
226                 printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
227                         __func__);
228                 return;
229         }
230         dsp->rx_is_off = rx_off;
231         if (dsp_debug & DEBUG_DSP_CORE)
232                 printk(KERN_DEBUG "%s: %s set rx_off = %d\n",
233                         __func__, dsp->name, rx_off);
234 }
235 static void
236 dsp_rx_off(struct dsp *dsp)
237 {
238         struct dsp_conf_member  *member;
239
240         if (dsp_options & DSP_OPT_NOHARDWARE)
241                 return;
242
243         /* no conf */
244         if (!dsp->conf) {
245                 dsp_rx_off_member(dsp);
246                 return;
247         }
248         /* check all members in conf */
249         list_for_each_entry(member, &dsp->conf->mlist, list) {
250                 dsp_rx_off_member(member->dsp);
251         }
252 }
253
254 /* enable "fill empty" feature */
255 static void
256 dsp_fill_empty(struct dsp *dsp)
257 {
258         struct mISDN_ctrl_req   cq;
259
260         memset(&cq, 0, sizeof(cq));
261
262         if (!dsp->ch.peer) {
263                 if (dsp_debug & DEBUG_DSP_CORE)
264                         printk(KERN_DEBUG "%s: no peer, no fill_empty\n",
265                                 __func__);
266                 return;
267         }
268         cq.op = MISDN_CTRL_FILL_EMPTY;
269         cq.p1 = 1;
270         if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
271                 printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
272                         __func__);
273                 return;
274         }
275         if (dsp_debug & DEBUG_DSP_CORE)
276                 printk(KERN_DEBUG "%s: %s set fill_empty = 1\n",
277                         __func__, dsp->name);
278 }
279
280 static int
281 dsp_control_req(struct dsp *dsp, struct mISDNhead *hh, struct sk_buff *skb)
282 {
283         struct          sk_buff *nskb;
284         int ret = 0;
285         int cont;
286         u8 *data;
287         int len;
288
289         if (skb->len < sizeof(int))
290                 printk(KERN_ERR "%s: PH_CONTROL message too short\n", __func__);
291         cont = *((int *)skb->data);
292         len = skb->len - sizeof(int);
293         data = skb->data + sizeof(int);
294
295         switch (cont) {
296         case DTMF_TONE_START: /* turn on DTMF */
297                 if (dsp->hdlc) {
298                         ret = -EINVAL;
299                         break;
300                 }
301                 if (dsp_debug & DEBUG_DSP_CORE)
302                         printk(KERN_DEBUG "%s: start dtmf\n", __func__);
303                 if (len == sizeof(int)) {
304                         if (dsp_debug & DEBUG_DSP_CORE)
305                                 printk(KERN_NOTICE "changing DTMF Threshold "
306                                         "to %d\n", *((int *)data));
307                         dsp->dtmf.treshold = (*(int *)data) * 10000;
308                 }
309                 /* init goertzel */
310                 dsp_dtmf_goertzel_init(dsp);
311
312                 /* check dtmf hardware */
313                 dsp_dtmf_hardware(dsp);
314                 break;
315         case DTMF_TONE_STOP: /* turn off DTMF */
316                 if (dsp_debug & DEBUG_DSP_CORE)
317                         printk(KERN_DEBUG "%s: stop dtmf\n", __func__);
318                 dsp->dtmf.hardware = 0;
319                 dsp->dtmf.software = 0;
320                 break;
321         case DSP_CONF_JOIN: /* join / update conference */
322                 if (len < sizeof(int)) {
323                         ret = -EINVAL;
324                         break;
325                 }
326                 if (*((u32 *)data) == 0)
327                         goto conf_split;
328                 if (dsp_debug & DEBUG_DSP_CORE)
329                         printk(KERN_DEBUG "%s: join conference %d\n",
330                                 __func__, *((u32 *)data));
331                 ret = dsp_cmx_conf(dsp, *((u32 *)data));
332                         /* dsp_cmx_hardware will also be called here */
333                 dsp_rx_off(dsp);
334                 if (dsp_debug & DEBUG_DSP_CMX)
335                         dsp_cmx_debug(dsp);
336                 break;
337         case DSP_CONF_SPLIT: /* remove from conference */
338 conf_split:
339                 if (dsp_debug & DEBUG_DSP_CORE)
340                         printk(KERN_DEBUG "%s: release conference\n", __func__);
341                 ret = dsp_cmx_conf(dsp, 0);
342                         /* dsp_cmx_hardware will also be called here */
343                 if (dsp_debug & DEBUG_DSP_CMX)
344                         dsp_cmx_debug(dsp);
345                 dsp_rx_off(dsp);
346                 break;
347         case DSP_TONE_PATT_ON: /* play tone */
348                 if (dsp->hdlc) {
349                         ret = -EINVAL;
350                         break;
351                 }
352                 if (len < sizeof(int)) {
353                         ret = -EINVAL;
354                         break;
355                 }
356                 if (dsp_debug & DEBUG_DSP_CORE)
357                         printk(KERN_DEBUG "%s: turn tone 0x%x on\n",
358                                 __func__, *((int *)skb->data));
359                 ret = dsp_tone(dsp, *((int *)data));
360                 if (!ret) {
361                         dsp_cmx_hardware(dsp->conf, dsp);
362                         dsp_rx_off(dsp);
363                 }
364                 if (!dsp->tone.tone)
365                         goto tone_off;
366                 break;
367         case DSP_TONE_PATT_OFF: /* stop tone */
368                 if (dsp->hdlc) {
369                         ret = -EINVAL;
370                         break;
371                 }
372                 if (dsp_debug & DEBUG_DSP_CORE)
373                         printk(KERN_DEBUG "%s: turn tone off\n", __func__);
374                 dsp_tone(dsp, 0);
375                 dsp_cmx_hardware(dsp->conf, dsp);
376                 dsp_rx_off(dsp);
377                 /* reset tx buffers (user space data) */
378 tone_off:
379                 dsp->rx_W = 0;
380                 dsp->rx_R = 0;
381                 break;
382         case DSP_VOL_CHANGE_TX: /* change volume */
383                 if (dsp->hdlc) {
384                         ret = -EINVAL;
385                         break;
386                 }
387                 if (len < sizeof(int)) {
388                         ret = -EINVAL;
389                         break;
390                 }
391                 dsp->tx_volume = *((int *)data);
392                 if (dsp_debug & DEBUG_DSP_CORE)
393                         printk(KERN_DEBUG "%s: change tx vol to %d\n",
394                                 __func__, dsp->tx_volume);
395                 dsp_cmx_hardware(dsp->conf, dsp);
396                 dsp_dtmf_hardware(dsp);
397                 dsp_rx_off(dsp);
398                 break;
399         case DSP_VOL_CHANGE_RX: /* change volume */
400                 if (dsp->hdlc) {
401                         ret = -EINVAL;
402                         break;
403                 }
404                 if (len < sizeof(int)) {
405                         ret = -EINVAL;
406                         break;
407                 }
408                 dsp->rx_volume = *((int *)data);
409                 if (dsp_debug & DEBUG_DSP_CORE)
410                         printk(KERN_DEBUG "%s: change rx vol to %d\n",
411                                 __func__, dsp->tx_volume);
412                 dsp_cmx_hardware(dsp->conf, dsp);
413                 dsp_dtmf_hardware(dsp);
414                 dsp_rx_off(dsp);
415                 break;
416         case DSP_ECHO_ON: /* enable echo */
417                 dsp->echo = 1; /* soft echo */
418                 if (dsp_debug & DEBUG_DSP_CORE)
419                         printk(KERN_DEBUG "%s: enable cmx-echo\n", __func__);
420                 dsp_cmx_hardware(dsp->conf, dsp);
421                 dsp_rx_off(dsp);
422                 if (dsp_debug & DEBUG_DSP_CMX)
423                         dsp_cmx_debug(dsp);
424                 break;
425         case DSP_ECHO_OFF: /* disable echo */
426                 dsp->echo = 0;
427                 if (dsp_debug & DEBUG_DSP_CORE)
428                         printk(KERN_DEBUG "%s: disable cmx-echo\n", __func__);
429                 dsp_cmx_hardware(dsp->conf, dsp);
430                 dsp_rx_off(dsp);
431                 if (dsp_debug & DEBUG_DSP_CMX)
432                         dsp_cmx_debug(dsp);
433                 break;
434         case DSP_RECEIVE_ON: /* enable receive to user space */
435                 if (dsp_debug & DEBUG_DSP_CORE)
436                         printk(KERN_DEBUG "%s: enable receive to user "
437                                 "space\n", __func__);
438                 dsp->rx_disabled = 0;
439                 dsp_rx_off(dsp);
440                 break;
441         case DSP_RECEIVE_OFF: /* disable receive to user space */
442                 if (dsp_debug & DEBUG_DSP_CORE)
443                         printk(KERN_DEBUG "%s: disable receive to "
444                                 "user space\n", __func__);
445                 dsp->rx_disabled = 1;
446                 dsp_rx_off(dsp);
447                 break;
448         case DSP_MIX_ON: /* enable mixing of tx data */
449                 if (dsp->hdlc) {
450                         ret = -EINVAL;
451                         break;
452                 }
453                 if (dsp_debug & DEBUG_DSP_CORE)
454                         printk(KERN_DEBUG "%s: enable mixing of "
455                                 "tx-data with conf mebers\n", __func__);
456                 dsp->tx_mix = 1;
457                 dsp_cmx_hardware(dsp->conf, dsp);
458                 dsp_rx_off(dsp);
459                 if (dsp_debug & DEBUG_DSP_CMX)
460                         dsp_cmx_debug(dsp);
461                 break;
462         case DSP_MIX_OFF: /* disable mixing of tx data */
463                 if (dsp->hdlc) {
464                         ret = -EINVAL;
465                         break;
466                 }
467                 if (dsp_debug & DEBUG_DSP_CORE)
468                         printk(KERN_DEBUG "%s: disable mixing of "
469                                 "tx-data with conf mebers\n", __func__);
470                 dsp->tx_mix = 0;
471                 dsp_cmx_hardware(dsp->conf, dsp);
472                 dsp_rx_off(dsp);
473                 if (dsp_debug & DEBUG_DSP_CMX)
474                         dsp_cmx_debug(dsp);
475                 break;
476         case DSP_TXDATA_ON: /* enable txdata */
477                 dsp->tx_data = 1;
478                 if (dsp_debug & DEBUG_DSP_CORE)
479                         printk(KERN_DEBUG "%s: enable tx-data\n", __func__);
480                 dsp_cmx_hardware(dsp->conf, dsp);
481                 dsp_rx_off(dsp);
482                 if (dsp_debug & DEBUG_DSP_CMX)
483                         dsp_cmx_debug(dsp);
484                 break;
485         case DSP_TXDATA_OFF: /* disable txdata */
486                 dsp->tx_data = 0;
487                 if (dsp_debug & DEBUG_DSP_CORE)
488                         printk(KERN_DEBUG "%s: disable tx-data\n", __func__);
489                 dsp_cmx_hardware(dsp->conf, dsp);
490                 dsp_rx_off(dsp);
491                 if (dsp_debug & DEBUG_DSP_CMX)
492                         dsp_cmx_debug(dsp);
493                 break;
494         case DSP_DELAY: /* use delay algorithm instead of dynamic
495                            jitter algorithm */
496                 if (dsp->hdlc) {
497                         ret = -EINVAL;
498                         break;
499                 }
500                 if (len < sizeof(int)) {
501                         ret = -EINVAL;
502                         break;
503                 }
504                 dsp->cmx_delay = (*((int *)data)) << 3;
505                         /* miliseconds to samples */
506                 if (dsp->cmx_delay >= (CMX_BUFF_HALF>>1))
507                         /* clip to half of maximum usable buffer
508                         (half of half buffer) */
509                         dsp->cmx_delay = (CMX_BUFF_HALF>>1) - 1;
510                 if (dsp_debug & DEBUG_DSP_CORE)
511                         printk(KERN_DEBUG "%s: use delay algorithm to "
512                                 "compensate jitter (%d samples)\n",
513                                 __func__, dsp->cmx_delay);
514                 break;
515         case DSP_JITTER: /* use dynamic jitter algorithm instead of
516                     delay algorithm */
517                 if (dsp->hdlc) {
518                         ret = -EINVAL;
519                         break;
520                 }
521                 dsp->cmx_delay = 0;
522                 if (dsp_debug & DEBUG_DSP_CORE)
523                         printk(KERN_DEBUG "%s: use jitter algorithm to "
524                                 "compensate jitter\n", __func__);
525                 break;
526         case DSP_TX_DEJITTER: /* use dynamic jitter algorithm for tx-buffer */
527                 if (dsp->hdlc) {
528                         ret = -EINVAL;
529                         break;
530                 }
531                 dsp->tx_dejitter = 1;
532                 if (dsp_debug & DEBUG_DSP_CORE)
533                         printk(KERN_DEBUG "%s: use dejitter on TX "
534                                 "buffer\n", __func__);
535                 break;
536         case DSP_TX_DEJ_OFF: /* use tx-buffer without dejittering*/
537                 if (dsp->hdlc) {
538                         ret = -EINVAL;
539                         break;
540                 }
541                 dsp->tx_dejitter = 0;
542                 if (dsp_debug & DEBUG_DSP_CORE)
543                         printk(KERN_DEBUG "%s: use TX buffer without "
544                                 "dejittering\n", __func__);
545                 break;
546         case DSP_PIPELINE_CFG:
547                 if (dsp->hdlc) {
548                         ret = -EINVAL;
549                         break;
550                 }
551                 if (len > 0 && ((char *)data)[len - 1]) {
552                         printk(KERN_DEBUG "%s: pipeline config string "
553                                 "is not NULL terminated!\n", __func__);
554                         ret = -EINVAL;
555                 } else {
556                         dsp->pipeline.inuse = 1;
557                         dsp_cmx_hardware(dsp->conf, dsp);
558                         ret = dsp_pipeline_build(&dsp->pipeline,
559                                 len > 0 ? (char *)data : NULL);
560                         dsp_cmx_hardware(dsp->conf, dsp);
561                         dsp_rx_off(dsp);
562                 }
563                 break;
564         case DSP_BF_ENABLE_KEY: /* turn blowfish on */
565                 if (dsp->hdlc) {
566                         ret = -EINVAL;
567                         break;
568                 }
569                 if (len < 4 || len > 56) {
570                         ret = -EINVAL;
571                         break;
572                 }
573                 if (dsp_debug & DEBUG_DSP_CORE)
574                         printk(KERN_DEBUG "%s: turn blowfish on (key "
575                                 "not shown)\n", __func__);
576                 ret = dsp_bf_init(dsp, (u8 *)data, len);
577                 /* set new cont */
578                 if (!ret)
579                         cont = DSP_BF_ACCEPT;
580                 else
581                         cont = DSP_BF_REJECT;
582                 /* send indication if it worked to set it */
583                 nskb = _alloc_mISDN_skb(PH_CONTROL_IND, MISDN_ID_ANY,
584                         sizeof(int), &cont, GFP_ATOMIC);
585                 if (nskb) {
586                         if (dsp->up) {
587                                 if (dsp->up->send(dsp->up, nskb))
588                                         dev_kfree_skb(nskb);
589                         } else
590                                 dev_kfree_skb(nskb);
591                 }
592                 if (!ret) {
593                         dsp_cmx_hardware(dsp->conf, dsp);
594                         dsp_dtmf_hardware(dsp);
595                         dsp_rx_off(dsp);
596                 }
597                 break;
598         case DSP_BF_DISABLE: /* turn blowfish off */
599                 if (dsp->hdlc) {
600                         ret = -EINVAL;
601                         break;
602                 }
603                 if (dsp_debug & DEBUG_DSP_CORE)
604                         printk(KERN_DEBUG "%s: turn blowfish off\n", __func__);
605                 dsp_bf_cleanup(dsp);
606                 dsp_cmx_hardware(dsp->conf, dsp);
607                 dsp_dtmf_hardware(dsp);
608                 dsp_rx_off(dsp);
609                 break;
610         default:
611                 if (dsp_debug & DEBUG_DSP_CORE)
612                         printk(KERN_DEBUG "%s: ctrl req %x unhandled\n",
613                                 __func__, cont);
614                 ret = -EINVAL;
615         }
616         return ret;
617 }
618
619 static void
620 get_features(struct mISDNchannel *ch)
621 {
622         struct dsp              *dsp = container_of(ch, struct dsp, ch);
623         struct mISDN_ctrl_req   cq;
624
625         if (!ch->peer) {
626                 if (dsp_debug & DEBUG_DSP_CORE)
627                         printk(KERN_DEBUG "%s: no peer, no features\n",
628                                 __func__);
629                 return;
630         }
631         memset(&cq, 0, sizeof(cq));
632         cq.op = MISDN_CTRL_GETOP;
633         if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq) < 0) {
634                 printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
635                         __func__);
636                 return;
637         }
638         if (cq.op & MISDN_CTRL_RX_OFF)
639                 dsp->features_rx_off = 1;
640         if (cq.op & MISDN_CTRL_FILL_EMPTY)
641                 dsp->features_fill_empty = 1;
642         if (dsp_options & DSP_OPT_NOHARDWARE)
643                 return;
644         if ((cq.op & MISDN_CTRL_HW_FEATURES_OP)) {
645                 cq.op = MISDN_CTRL_HW_FEATURES;
646                 *((u_long *)&cq.p1) = (u_long)&dsp->features;
647                 if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq)) {
648                         printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
649                                 __func__);
650                 }
651         } else
652                 if (dsp_debug & DEBUG_DSP_CORE)
653                         printk(KERN_DEBUG "%s: features not supported for %s\n",
654                                 __func__, dsp->name);
655 }
656
657 static int
658 dsp_function(struct mISDNchannel *ch,  struct sk_buff *skb)
659 {
660         struct dsp                      *dsp = container_of(ch, struct dsp, ch);
661         struct mISDNhead        *hh;
662         int                     ret = 0;
663         u8                      *digits;
664         int                     cont;
665         u_long                  flags;
666
667         hh = mISDN_HEAD_P(skb);
668         switch (hh->prim) {
669         /* FROM DOWN */
670         case (PH_DATA_CNF):
671                 dsp->data_pending = 0;
672                 /* trigger next hdlc frame, if any */
673                 if (dsp->hdlc) {
674                         spin_lock_irqsave(&dsp_lock, flags);
675                         if (dsp->b_active)
676                                 schedule_work(&dsp->workq);
677                         spin_unlock_irqrestore(&dsp_lock, flags);
678                 }
679                 break;
680         case (PH_DATA_IND):
681         case (DL_DATA_IND):
682                 if (skb->len < 1) {
683                         ret = -EINVAL;
684                         break;
685                 }
686                 if (dsp->rx_is_off) {
687                         if (dsp_debug & DEBUG_DSP_CORE)
688                                 printk(KERN_DEBUG "%s: rx-data during rx_off"
689                                         " for %s\n",
690                                 __func__, dsp->name);
691                 }
692                 if (dsp->hdlc) {
693                         /* hdlc */
694                         spin_lock_irqsave(&dsp_lock, flags);
695                         dsp_cmx_hdlc(dsp, skb);
696                         spin_unlock_irqrestore(&dsp_lock, flags);
697                         if (dsp->rx_disabled) {
698                                 /* if receive is not allowed */
699                                 break;
700                         }
701                         hh->prim = DL_DATA_IND;
702                         if (dsp->up)
703                                 return dsp->up->send(dsp->up, skb);
704                         break;
705                 }
706
707                 /* decrypt if enabled */
708                 if (dsp->bf_enable)
709                         dsp_bf_decrypt(dsp, skb->data, skb->len);
710                 /* pipeline */
711                 if (dsp->pipeline.inuse)
712                         dsp_pipeline_process_rx(&dsp->pipeline, skb->data,
713                                 skb->len);
714                 /* change volume if requested */
715                 if (dsp->rx_volume)
716                         dsp_change_volume(skb, dsp->rx_volume);
717
718                 /* check if dtmf soft decoding is turned on */
719                 if (dsp->dtmf.software) {
720                         digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
721                                 skb->len, (dsp_options&DSP_OPT_ULAW)?1:0);
722                         while (*digits) {
723                                 struct sk_buff *nskb;
724                                 if (dsp_debug & DEBUG_DSP_DTMF)
725                                         printk(KERN_DEBUG "%s: digit"
726                                             "(%c) to layer %s\n",
727                                             __func__, *digits, dsp->name);
728                                 cont = DTMF_TONE_VAL | *digits;
729                                 nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
730                                     MISDN_ID_ANY, sizeof(int), &cont,
731                                     GFP_ATOMIC);
732                                 if (nskb) {
733                                         if (dsp->up) {
734                                                 if (dsp->up->send(
735                                                     dsp->up, nskb))
736                                                 dev_kfree_skb(nskb);
737                                         } else
738                                                 dev_kfree_skb(nskb);
739                                 }
740                                 digits++;
741                         }
742                 }
743                 /* we need to process receive data if software */
744                 spin_lock_irqsave(&dsp_lock, flags);
745                 if (dsp->pcm_slot_tx < 0 && dsp->pcm_slot_rx < 0) {
746                         /* process data from card at cmx */
747                         dsp_cmx_receive(dsp, skb);
748                 }
749                 spin_unlock_irqrestore(&dsp_lock, flags);
750
751                 if (dsp->rx_disabled) {
752                         /* if receive is not allowed */
753                         break;
754                 }
755                 hh->prim = DL_DATA_IND;
756                 if (dsp->up)
757                         return dsp->up->send(dsp->up, skb);
758                 break;
759         case (PH_CONTROL_IND):
760                 if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
761                         printk(KERN_DEBUG "%s: PH_CONTROL INDICATION "
762                                 "received: %x (len %d) %s\n", __func__,
763                                 hh->id, skb->len, dsp->name);
764                 switch (hh->id) {
765                 case (DTMF_HFC_COEF): /* getting coefficients */
766                         if (!dsp->dtmf.hardware) {
767                                 if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
768                                         printk(KERN_DEBUG "%s: ignoring DTMF "
769                                                 "coefficients from HFC\n",
770                                                 __func__);
771                                 break;
772                         }
773                         digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
774                                 skb->len, 2);
775                         while (*digits) {
776                                 int k;
777                                 struct sk_buff *nskb;
778                                 if (dsp_debug & DEBUG_DSP_DTMF)
779                                         printk(KERN_DEBUG "%s: digit"
780                                             "(%c) to layer %s\n",
781                                             __func__, *digits, dsp->name);
782                                 k = *digits | DTMF_TONE_VAL;
783                                 nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
784                                         MISDN_ID_ANY, sizeof(int), &k,
785                                         GFP_ATOMIC);
786                                 if (nskb) {
787                                         if (dsp->up) {
788                                                 if (dsp->up->send(
789                                                     dsp->up, nskb))
790                                                 dev_kfree_skb(nskb);
791                                         } else
792                                                 dev_kfree_skb(nskb);
793                                 }
794                                 digits++;
795                         }
796                         break;
797                 case (HFC_VOL_CHANGE_TX): /* change volume */
798                         if (skb->len != sizeof(int)) {
799                                 ret = -EINVAL;
800                                 break;
801                         }
802                         spin_lock_irqsave(&dsp_lock, flags);
803                         dsp->tx_volume = *((int *)skb->data);
804                         if (dsp_debug & DEBUG_DSP_CORE)
805                                 printk(KERN_DEBUG "%s: change tx volume to "
806                                         "%d\n", __func__, dsp->tx_volume);
807                         dsp_cmx_hardware(dsp->conf, dsp);
808                         dsp_dtmf_hardware(dsp);
809                         dsp_rx_off(dsp);
810                         spin_unlock_irqrestore(&dsp_lock, flags);
811                         break;
812                 default:
813                         if (dsp_debug & DEBUG_DSP_CORE)
814                                 printk(KERN_DEBUG "%s: ctrl ind %x unhandled "
815                                         "%s\n", __func__, hh->id, dsp->name);
816                         ret = -EINVAL;
817                 }
818                 break;
819         case (PH_ACTIVATE_IND):
820         case (PH_ACTIVATE_CNF):
821                 if (dsp_debug & DEBUG_DSP_CORE)
822                         printk(KERN_DEBUG "%s: b_channel is now active %s\n",
823                                 __func__, dsp->name);
824                 /* bchannel now active */
825                 spin_lock_irqsave(&dsp_lock, flags);
826                 dsp->b_active = 1;
827                 dsp->data_pending = 0;
828                 dsp->rx_init = 1;
829                         /* rx_W and rx_R will be adjusted on first frame */
830                 dsp->rx_W = 0;
831                 dsp->rx_R = 0;
832                 memset(dsp->rx_buff, 0, sizeof(dsp->rx_buff));
833                 dsp_cmx_hardware(dsp->conf, dsp);
834                 dsp_dtmf_hardware(dsp);
835                 dsp_rx_off(dsp);
836                 spin_unlock_irqrestore(&dsp_lock, flags);
837                 if (dsp_debug & DEBUG_DSP_CORE)
838                         printk(KERN_DEBUG "%s: done with activation, sending "
839                                 "confirm to user space. %s\n", __func__,
840                                 dsp->name);
841                 /* send activation to upper layer */
842                 hh->prim = DL_ESTABLISH_CNF;
843                 if (dsp->up)
844                         return dsp->up->send(dsp->up, skb);
845                 break;
846         case (PH_DEACTIVATE_IND):
847         case (PH_DEACTIVATE_CNF):
848                 if (dsp_debug & DEBUG_DSP_CORE)
849                         printk(KERN_DEBUG "%s: b_channel is now inactive %s\n",
850                                 __func__, dsp->name);
851                 /* bchannel now inactive */
852                 spin_lock_irqsave(&dsp_lock, flags);
853                 dsp->b_active = 0;
854                 dsp->data_pending = 0;
855                 dsp_cmx_hardware(dsp->conf, dsp);
856                 dsp_rx_off(dsp);
857                 spin_unlock_irqrestore(&dsp_lock, flags);
858                 hh->prim = DL_RELEASE_CNF;
859                 if (dsp->up)
860                         return dsp->up->send(dsp->up, skb);
861                 break;
862         /* FROM UP */
863         case (DL_DATA_REQ):
864         case (PH_DATA_REQ):
865                 if (skb->len < 1) {
866                         ret = -EINVAL;
867                         break;
868                 }
869                 if (dsp->hdlc) {
870                         /* hdlc */
871                         if (!dsp->b_active) {
872                                 ret = -EIO;
873                                 break;
874                         }
875                         hh->prim = PH_DATA_REQ;
876                         spin_lock_irqsave(&dsp_lock, flags);
877                         skb_queue_tail(&dsp->sendq, skb);
878                         schedule_work(&dsp->workq);
879                         spin_unlock_irqrestore(&dsp_lock, flags);
880                         return 0;
881                 }
882                 /* send data to tx-buffer (if no tone is played) */
883                 if (!dsp->tone.tone) {
884                         spin_lock_irqsave(&dsp_lock, flags);
885                         dsp_cmx_transmit(dsp, skb);
886                         spin_unlock_irqrestore(&dsp_lock, flags);
887                 }
888                 break;
889         case (PH_CONTROL_REQ):
890                 spin_lock_irqsave(&dsp_lock, flags);
891                 ret = dsp_control_req(dsp, hh, skb);
892                 spin_unlock_irqrestore(&dsp_lock, flags);
893                 break;
894         case (DL_ESTABLISH_REQ):
895         case (PH_ACTIVATE_REQ):
896                 if (dsp_debug & DEBUG_DSP_CORE)
897                         printk(KERN_DEBUG "%s: activating b_channel %s\n",
898                                 __func__, dsp->name);
899                 if (dsp->dtmf.hardware || dsp->dtmf.software)
900                         dsp_dtmf_goertzel_init(dsp);
901                 get_features(ch);
902                 /* enable fill_empty feature */
903                 if (dsp->features_fill_empty)
904                         dsp_fill_empty(dsp);
905                 /* send ph_activate */
906                 hh->prim = PH_ACTIVATE_REQ;
907                 if (ch->peer)
908                         return ch->recv(ch->peer, skb);
909                 break;
910         case (DL_RELEASE_REQ):
911         case (PH_DEACTIVATE_REQ):
912                 if (dsp_debug & DEBUG_DSP_CORE)
913                         printk(KERN_DEBUG "%s: releasing b_channel %s\n",
914                                 __func__, dsp->name);
915                 spin_lock_irqsave(&dsp_lock, flags);
916                 dsp->tone.tone = 0;
917                 dsp->tone.hardware = 0;
918                 dsp->tone.software = 0;
919                 if (timer_pending(&dsp->tone.tl))
920                         del_timer(&dsp->tone.tl);
921                 if (dsp->conf)
922                         dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be
923                                                  called here */
924                 skb_queue_purge(&dsp->sendq);
925                 spin_unlock_irqrestore(&dsp_lock, flags);
926                 hh->prim = PH_DEACTIVATE_REQ;
927                 if (ch->peer)
928                         return ch->recv(ch->peer, skb);
929                 break;
930         default:
931                 if (dsp_debug & DEBUG_DSP_CORE)
932                         printk(KERN_DEBUG "%s: msg %x unhandled %s\n",
933                                 __func__, hh->prim, dsp->name);
934                 ret = -EINVAL;
935         }
936         if (!ret)
937                 dev_kfree_skb(skb);
938         return ret;
939 }
940
941 static int
942 dsp_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
943 {
944         struct dsp              *dsp = container_of(ch, struct dsp, ch);
945         u_long          flags;
946         int             err = 0;
947
948         if (debug & DEBUG_DSP_CTRL)
949         printk(KERN_DEBUG "%s:(%x)\n", __func__, cmd);
950
951         switch (cmd) {
952         case OPEN_CHANNEL:
953                 break;
954         case CLOSE_CHANNEL:
955                 if (dsp->ch.peer)
956                         dsp->ch.peer->ctrl(dsp->ch.peer, CLOSE_CHANNEL, NULL);
957
958                 /* wait until workqueue has finished,
959                  * must lock here, or we may hit send-process currently
960                  * queueing. */
961                 spin_lock_irqsave(&dsp_lock, flags);
962                 dsp->b_active = 0;
963                 spin_unlock_irqrestore(&dsp_lock, flags);
964                 /* MUST not be locked, because it waits until queue is done. */
965                 cancel_work_sync(&dsp->workq);
966                 spin_lock_irqsave(&dsp_lock, flags);
967                 if (timer_pending(&dsp->tone.tl))
968                         del_timer(&dsp->tone.tl);
969                 skb_queue_purge(&dsp->sendq);
970                 if (dsp_debug & DEBUG_DSP_CTRL)
971                         printk(KERN_DEBUG "%s: releasing member %s\n",
972                                 __func__, dsp->name);
973                 dsp->b_active = 0;
974                 dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be called
975                                          here */
976                 dsp_pipeline_destroy(&dsp->pipeline);
977
978                 if (dsp_debug & DEBUG_DSP_CTRL)
979                         printk(KERN_DEBUG "%s: remove & destroy object %s\n",
980                                 __func__, dsp->name);
981                 list_del(&dsp->list);
982                 spin_unlock_irqrestore(&dsp_lock, flags);
983
984                 if (dsp_debug & DEBUG_DSP_CTRL)
985                         printk(KERN_DEBUG "%s: dsp instance released\n",
986                                 __func__);
987                 vfree(dsp);
988                 module_put(THIS_MODULE);
989                 break;
990         }
991         return err;
992 }
993
994 static void
995 dsp_send_bh(struct work_struct *work)
996 {
997         struct dsp *dsp = container_of(work, struct dsp, workq);
998         struct sk_buff *skb;
999         struct mISDNhead        *hh;
1000
1001         if (dsp->hdlc && dsp->data_pending)
1002                 return; /* wait until data has been acknowledged */
1003
1004         /* send queued data */
1005         while ((skb = skb_dequeue(&dsp->sendq))) {
1006                 /* in locked date, we must have still data in queue */
1007                 if (dsp->data_pending) {
1008                         if (dsp_debug & DEBUG_DSP_CORE)
1009                                 printk(KERN_DEBUG "%s: fifo full %s, this is "
1010                                         "no bug!\n", __func__, dsp->name);
1011                         /* flush transparent data, if not acked */
1012                         dev_kfree_skb(skb);
1013                         continue;
1014                 }
1015                 hh = mISDN_HEAD_P(skb);
1016                 if (hh->prim == DL_DATA_REQ) {
1017                         /* send packet up */
1018                         if (dsp->up) {
1019                                 if (dsp->up->send(dsp->up, skb))
1020                                         dev_kfree_skb(skb);
1021                         } else
1022                                 dev_kfree_skb(skb);
1023                 } else {
1024                         /* send packet down */
1025                         if (dsp->ch.peer) {
1026                                 dsp->data_pending = 1;
1027                                 if (dsp->ch.recv(dsp->ch.peer, skb)) {
1028                                         dev_kfree_skb(skb);
1029                                         dsp->data_pending = 0;
1030                                 }
1031                         } else
1032                                 dev_kfree_skb(skb);
1033                 }
1034         }
1035 }
1036
1037 static int
1038 dspcreate(struct channel_req *crq)
1039 {
1040         struct dsp              *ndsp;
1041         u_long          flags;
1042
1043         if (crq->protocol != ISDN_P_B_L2DSP
1044          && crq->protocol != ISDN_P_B_L2DSPHDLC)
1045                 return -EPROTONOSUPPORT;
1046         ndsp = vmalloc(sizeof(struct dsp));
1047         if (!ndsp) {
1048                 printk(KERN_ERR "%s: vmalloc struct dsp failed\n", __func__);
1049                 return -ENOMEM;
1050         }
1051         memset(ndsp, 0, sizeof(struct dsp));
1052         if (dsp_debug & DEBUG_DSP_CTRL)
1053                 printk(KERN_DEBUG "%s: creating new dsp instance\n", __func__);
1054
1055         /* default enabled */
1056         INIT_WORK(&ndsp->workq, (void *)dsp_send_bh);
1057         skb_queue_head_init(&ndsp->sendq);
1058         ndsp->ch.send = dsp_function;
1059         ndsp->ch.ctrl = dsp_ctrl;
1060         ndsp->up = crq->ch;
1061         crq->ch = &ndsp->ch;
1062         if (crq->protocol == ISDN_P_B_L2DSP) {
1063                 crq->protocol = ISDN_P_B_RAW;
1064                 ndsp->hdlc = 0;
1065         } else {
1066                 crq->protocol = ISDN_P_B_HDLC;
1067                 ndsp->hdlc = 1;
1068         }
1069         if (!try_module_get(THIS_MODULE))
1070                 printk(KERN_WARNING "%s:cannot get module\n",
1071                         __func__);
1072
1073         sprintf(ndsp->name, "DSP_C%x(0x%p)",
1074                 ndsp->up->st->dev->id + 1, ndsp);
1075         /* set frame size to start */
1076         ndsp->features.hfc_id = -1; /* current PCM id */
1077         ndsp->features.pcm_id = -1; /* current PCM id */
1078         ndsp->pcm_slot_rx = -1; /* current CPM slot */
1079         ndsp->pcm_slot_tx = -1;
1080         ndsp->pcm_bank_rx = -1;
1081         ndsp->pcm_bank_tx = -1;
1082         ndsp->hfc_conf = -1; /* current conference number */
1083         /* set tone timer */
1084         ndsp->tone.tl.function = (void *)dsp_tone_timeout;
1085         ndsp->tone.tl.data = (long) ndsp;
1086         init_timer(&ndsp->tone.tl);
1087
1088         if (dtmfthreshold < 20 || dtmfthreshold > 500)
1089                 dtmfthreshold = 200;
1090         ndsp->dtmf.treshold = dtmfthreshold*10000;
1091
1092         /* init pipeline append to list */
1093         spin_lock_irqsave(&dsp_lock, flags);
1094         dsp_pipeline_init(&ndsp->pipeline);
1095         list_add_tail(&ndsp->list, &dsp_ilist);
1096         spin_unlock_irqrestore(&dsp_lock, flags);
1097
1098         return 0;
1099 }
1100
1101
1102 static struct Bprotocol DSP = {
1103         .Bprotocols = (1 << (ISDN_P_B_L2DSP & ISDN_P_B_MASK))
1104                 | (1 << (ISDN_P_B_L2DSPHDLC & ISDN_P_B_MASK)),
1105         .name = "dsp",
1106         .create = dspcreate
1107 };
1108
1109 static int dsp_init(void)
1110 {
1111         int err;
1112         int tics;
1113
1114         printk(KERN_INFO "DSP modul %s\n", mISDN_dsp_revision);
1115
1116         dsp_options = options;
1117         dsp_debug = debug;
1118
1119         /* set packet size */
1120         dsp_poll = poll;
1121         if (dsp_poll) {
1122                 if (dsp_poll > MAX_POLL) {
1123                         printk(KERN_ERR "%s: Wrong poll value (%d), use %d "
1124                                 "maximum.\n", __func__, poll, MAX_POLL);
1125                         err = -EINVAL;
1126                         return err;
1127                 }
1128                 if (dsp_poll < 8) {
1129                         printk(KERN_ERR "%s: Wrong poll value (%d), use 8 "
1130                                 "minimum.\n", __func__, dsp_poll);
1131                         err = -EINVAL;
1132                         return err;
1133                 }
1134                 dsp_tics = poll * HZ / 8000;
1135                 if (dsp_tics * 8000 != poll * HZ) {
1136                         printk(KERN_INFO "mISDN_dsp: Cannot clock every %d "
1137                                 "samples (0,125 ms). It is not a multiple of "
1138                                 "%d HZ.\n", poll, HZ);
1139                         err = -EINVAL;
1140                         return err;
1141                 }
1142         } else {
1143                 poll = 8;
1144                 while (poll <= MAX_POLL) {
1145                         tics = (poll * HZ) / 8000;
1146                         if (tics * 8000 == poll * HZ) {
1147                                 dsp_tics = tics;
1148                                 dsp_poll = poll;
1149                                 if (poll >= 64)
1150                                         break;
1151                         }
1152                         poll++;
1153                 }
1154         }
1155         if (dsp_poll == 0) {
1156                 printk(KERN_INFO "mISDN_dsp: There is no multiple of kernel "
1157                         "clock that equals exactly the duration of 8-256 "
1158                         "samples. (Choose kernel clock speed like 100, 250, "
1159                         "300, 1000)\n");
1160                 err = -EINVAL;
1161                 return err;
1162         }
1163         printk(KERN_INFO "mISDN_dsp: DSP clocks every %d samples. This equals "
1164                 "%d jiffies.\n", dsp_poll, dsp_tics);
1165
1166         spin_lock_init(&dsp_lock);
1167         INIT_LIST_HEAD(&dsp_ilist);
1168         INIT_LIST_HEAD(&conf_ilist);
1169
1170         /* init conversion tables */
1171         dsp_audio_generate_law_tables();
1172         dsp_silence = (dsp_options&DSP_OPT_ULAW)?0xff:0x2a;
1173         dsp_audio_law_to_s32 = (dsp_options&DSP_OPT_ULAW)?dsp_audio_ulaw_to_s32:
1174                 dsp_audio_alaw_to_s32;
1175         dsp_audio_generate_s2law_table();
1176         dsp_audio_generate_seven();
1177         dsp_audio_generate_mix_table();
1178         if (dsp_options & DSP_OPT_ULAW)
1179                 dsp_audio_generate_ulaw_samples();
1180         dsp_audio_generate_volume_changes();
1181
1182         err = dsp_pipeline_module_init();
1183         if (err) {
1184                 printk(KERN_ERR "mISDN_dsp: Can't initialize pipeline, "
1185                         "error(%d)\n", err);
1186                 return err;
1187         }
1188
1189         err = mISDN_register_Bprotocol(&DSP);
1190         if (err) {
1191                 printk(KERN_ERR "Can't register %s error(%d)\n", DSP.name, err);
1192                 return err;
1193         }
1194
1195         /* set sample timer */
1196         dsp_spl_tl.function = (void *)dsp_cmx_send;
1197         dsp_spl_tl.data = 0;
1198         init_timer(&dsp_spl_tl);
1199         dsp_spl_tl.expires = jiffies + dsp_tics;
1200         dsp_spl_jiffies = dsp_spl_tl.expires;
1201         add_timer(&dsp_spl_tl);
1202
1203         return 0;
1204 }
1205
1206
1207 static void dsp_cleanup(void)
1208 {
1209         mISDN_unregister_Bprotocol(&DSP);
1210
1211         if (timer_pending(&dsp_spl_tl))
1212                 del_timer(&dsp_spl_tl);
1213
1214         if (!list_empty(&dsp_ilist)) {
1215                 printk(KERN_ERR "mISDN_dsp: Audio DSP object inst list not "
1216                         "empty.\n");
1217         }
1218         if (!list_empty(&conf_ilist)) {
1219                 printk(KERN_ERR "mISDN_dsp: Conference list not empty. Not "
1220                         "all memory freed.\n");
1221         }
1222
1223         dsp_pipeline_module_exit();
1224 }
1225
1226 module_init(dsp_init);
1227 module_exit(dsp_cleanup);
1228