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