drivers/isdn/mISDN/dsp_core.c

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