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