linux/drivers/isdn/mISDN/dsp_core.c
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   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 performance 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 losing
 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 useful if only announcements are played. Not sending is
 131 * useful if an answering machine records audio. Not sending and receiving is
 132 * useful during most states of the call. If supported by hardware, tones
 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/gfp.h>
 158#include <linux/mISDNif.h>
 159#include <linux/mISDNdsp.h>
 160#include <linux/module.h>
 161#include <linux/vmalloc.h>
 162#include "core.h"
 163#include "dsp.h"
 164
 165static const char *mISDN_dsp_revision = "2.0";
 166
 167static int debug;
 168static int options;
 169static int poll;
 170static int dtmfthreshold = 100;
 171
 172MODULE_AUTHOR("Andreas Eversberg");
 173module_param(debug, uint, S_IRUGO | S_IWUSR);
 174module_param(options, uint, S_IRUGO | S_IWUSR);
 175module_param(poll, uint, S_IRUGO | S_IWUSR);
 176module_param(dtmfthreshold, uint, S_IRUGO | S_IWUSR);
 177MODULE_LICENSE("GPL");
 178
 179/*int spinnest = 0;*/
 180
 181spinlock_t dsp_lock; /* global dsp lock */
 182struct list_head dsp_ilist;
 183struct list_head conf_ilist;
 184int dsp_debug;
 185int dsp_options;
 186int dsp_poll, dsp_tics;
 187
 188/* check if rx may be turned off or must be turned on */
 189static void
 190dsp_rx_off_member(struct dsp *dsp)
 191{
 192        struct mISDN_ctrl_req   cq;
 193        int rx_off = 1;
 194
 195        memset(&cq, 0, sizeof(cq));
 196
 197        if (!dsp->features_rx_off)
 198                return;
 199
 200        /* not disabled */
 201        if (!dsp->rx_disabled)
 202                rx_off = 0;
 203        /* software dtmf */
 204        else if (dsp->dtmf.software)
 205                rx_off = 0;
 206        /* echo in software */
 207        else if (dsp->echo.software)
 208                rx_off = 0;
 209        /* bridge in software */
 210        else if (dsp->conf && dsp->conf->software)
 211                rx_off = 0;
 212        /* data is not required by user space and not required
 213         * for echo dtmf detection, soft-echo, soft-bridging */
 214
 215        if (rx_off == dsp->rx_is_off)
 216                return;
 217
 218        if (!dsp->ch.peer) {
 219                if (dsp_debug & DEBUG_DSP_CORE)
 220                        printk(KERN_DEBUG "%s: no peer, no rx_off\n",
 221                               __func__);
 222                return;
 223        }
 224        cq.op = MISDN_CTRL_RX_OFF;
 225        cq.p1 = rx_off;
 226        if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
 227                printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
 228                       __func__);
 229                return;
 230        }
 231        dsp->rx_is_off = rx_off;
 232        if (dsp_debug & DEBUG_DSP_CORE)
 233                printk(KERN_DEBUG "%s: %s set rx_off = %d\n",
 234                       __func__, dsp->name, rx_off);
 235}
 236static void
 237dsp_rx_off(struct dsp *dsp)
 238{
 239        struct dsp_conf_member  *member;
 240
 241        if (dsp_options & DSP_OPT_NOHARDWARE)
 242                return;
 243
 244        /* no conf */
 245        if (!dsp->conf) {
 246                dsp_rx_off_member(dsp);
 247                return;
 248        }
 249        /* check all members in conf */
 250        list_for_each_entry(member, &dsp->conf->mlist, list) {
 251                dsp_rx_off_member(member->dsp);
 252        }
 253}
 254
 255/* enable "fill empty" feature */
 256static void
 257dsp_fill_empty(struct dsp *dsp)
 258{
 259        struct mISDN_ctrl_req   cq;
 260
 261        memset(&cq, 0, sizeof(cq));
 262
 263        if (!dsp->ch.peer) {
 264                if (dsp_debug & DEBUG_DSP_CORE)
 265                        printk(KERN_DEBUG "%s: no peer, no fill_empty\n",
 266                               __func__);
 267                return;
 268        }
 269        cq.op = MISDN_CTRL_FILL_EMPTY;
 270        cq.p1 = 1;
 271        cq.p2 = dsp_silence;
 272        if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
 273                printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
 274                       __func__);
 275                return;
 276        }
 277        if (dsp_debug & DEBUG_DSP_CORE)
 278                printk(KERN_DEBUG "%s: %s set fill_empty = 1\n",
 279                       __func__, dsp->name);
 280}
 281
 282static int
 283dsp_control_req(struct dsp *dsp, struct mISDNhead *hh, struct sk_buff *skb)
 284{
 285        struct sk_buff  *nskb;
 286        int ret = 0;
 287        int cont;
 288        u8 *data;
 289        int len;
 290
 291        if (skb->len < sizeof(int)) {
 292                printk(KERN_ERR "%s: PH_CONTROL message too short\n", __func__);
 293                return -EINVAL;
 294        }
 295        cont = *((int *)skb->data);
 296        len = skb->len - sizeof(int);
 297        data = skb->data + sizeof(int);
 298
 299        switch (cont) {
 300        case DTMF_TONE_START: /* turn on DTMF */
 301                if (dsp->hdlc) {
 302                        ret = -EINVAL;
 303                        break;
 304                }
 305                if (dsp_debug & DEBUG_DSP_CORE)
 306                        printk(KERN_DEBUG "%s: start dtmf\n", __func__);
 307                if (len == sizeof(int)) {
 308                        if (dsp_debug & DEBUG_DSP_CORE)
 309                                printk(KERN_NOTICE "changing DTMF Threshold "
 310                                       "to %d\n", *((int *)data));
 311                        dsp->dtmf.treshold = (*(int *)data) * 10000;
 312                }
 313                dsp->dtmf.enable = 1;
 314                /* init goertzel */
 315                dsp_dtmf_goertzel_init(dsp);
 316
 317                /* check dtmf hardware */
 318                dsp_dtmf_hardware(dsp);
 319                dsp_rx_off(dsp);
 320                break;
 321        case DTMF_TONE_STOP: /* turn off DTMF */
 322                if (dsp_debug & DEBUG_DSP_CORE)
 323                        printk(KERN_DEBUG "%s: stop dtmf\n", __func__);
 324                dsp->dtmf.enable = 0;
 325                dsp->dtmf.hardware = 0;
 326                dsp->dtmf.software = 0;
 327                break;
 328        case DSP_CONF_JOIN: /* join / update conference */
 329                if (len < sizeof(int)) {
 330                        ret = -EINVAL;
 331                        break;
 332                }
 333                if (*((u32 *)data) == 0)
 334                        goto conf_split;
 335                if (dsp_debug & DEBUG_DSP_CORE)
 336                        printk(KERN_DEBUG "%s: join conference %d\n",
 337                               __func__, *((u32 *)data));
 338                ret = dsp_cmx_conf(dsp, *((u32 *)data));
 339                /* dsp_cmx_hardware will also be called here */
 340                dsp_rx_off(dsp);
 341                if (dsp_debug & DEBUG_DSP_CMX)
 342                        dsp_cmx_debug(dsp);
 343                break;
 344        case DSP_CONF_SPLIT: /* remove from conference */
 345        conf_split:
 346                if (dsp_debug & DEBUG_DSP_CORE)
 347                        printk(KERN_DEBUG "%s: release conference\n", __func__);
 348                ret = dsp_cmx_conf(dsp, 0);
 349                /* dsp_cmx_hardware will also be called here */
 350                if (dsp_debug & DEBUG_DSP_CMX)
 351                        dsp_cmx_debug(dsp);
 352                dsp_rx_off(dsp);
 353                break;
 354        case DSP_TONE_PATT_ON: /* play tone */
 355                if (dsp->hdlc) {
 356                        ret = -EINVAL;
 357                        break;
 358                }
 359                if (len < sizeof(int)) {
 360                        ret = -EINVAL;
 361                        break;
 362                }
 363                if (dsp_debug & DEBUG_DSP_CORE)
 364                        printk(KERN_DEBUG "%s: turn tone 0x%x on\n",
 365                               __func__, *((int *)skb->data));
 366                ret = dsp_tone(dsp, *((int *)data));
 367                if (!ret) {
 368                        dsp_cmx_hardware(dsp->conf, dsp);
 369                        dsp_rx_off(dsp);
 370                }
 371                if (!dsp->tone.tone)
 372                        goto tone_off;
 373                break;
 374        case DSP_TONE_PATT_OFF: /* stop tone */
 375                if (dsp->hdlc) {
 376                        ret = -EINVAL;
 377                        break;
 378                }
 379                if (dsp_debug & DEBUG_DSP_CORE)
 380                        printk(KERN_DEBUG "%s: turn tone off\n", __func__);
 381                dsp_tone(dsp, 0);
 382                dsp_cmx_hardware(dsp->conf, dsp);
 383                dsp_rx_off(dsp);
 384                /* reset tx buffers (user space data) */
 385        tone_off:
 386                dsp->rx_W = 0;
 387                dsp->rx_R = 0;
 388                break;
 389        case DSP_VOL_CHANGE_TX: /* change volume */
 390                if (dsp->hdlc) {
 391                        ret = -EINVAL;
 392                        break;
 393                }
 394                if (len < sizeof(int)) {
 395                        ret = -EINVAL;
 396                        break;
 397                }
 398                dsp->tx_volume = *((int *)data);
 399                if (dsp_debug & DEBUG_DSP_CORE)
 400                        printk(KERN_DEBUG "%s: change tx vol to %d\n",
 401                               __func__, dsp->tx_volume);
 402                dsp_cmx_hardware(dsp->conf, dsp);
 403                dsp_dtmf_hardware(dsp);
 404                dsp_rx_off(dsp);
 405                break;
 406        case DSP_VOL_CHANGE_RX: /* change volume */
 407                if (dsp->hdlc) {
 408                        ret = -EINVAL;
 409                        break;
 410                }
 411                if (len < sizeof(int)) {
 412                        ret = -EINVAL;
 413                        break;
 414                }
 415                dsp->rx_volume = *((int *)data);
 416                if (dsp_debug & DEBUG_DSP_CORE)
 417                        printk(KERN_DEBUG "%s: change rx vol to %d\n",
 418                               __func__, dsp->tx_volume);
 419                dsp_cmx_hardware(dsp->conf, dsp);
 420                dsp_dtmf_hardware(dsp);
 421                dsp_rx_off(dsp);
 422                break;
 423        case DSP_ECHO_ON: /* enable echo */
 424                dsp->echo.software = 1; /* soft echo */
 425                if (dsp_debug & DEBUG_DSP_CORE)
 426                        printk(KERN_DEBUG "%s: enable cmx-echo\n", __func__);
 427                dsp_cmx_hardware(dsp->conf, dsp);
 428                dsp_rx_off(dsp);
 429                if (dsp_debug & DEBUG_DSP_CMX)
 430                        dsp_cmx_debug(dsp);
 431                break;
 432        case DSP_ECHO_OFF: /* disable echo */
 433                dsp->echo.software = 0;
 434                dsp->echo.hardware = 0;
 435                if (dsp_debug & DEBUG_DSP_CORE)
 436                        printk(KERN_DEBUG "%s: disable cmx-echo\n", __func__);
 437                dsp_cmx_hardware(dsp->conf, dsp);
 438                dsp_rx_off(dsp);
 439                if (dsp_debug & DEBUG_DSP_CMX)
 440                        dsp_cmx_debug(dsp);
 441                break;
 442        case DSP_RECEIVE_ON: /* enable receive to user space */
 443                if (dsp_debug & DEBUG_DSP_CORE)
 444                        printk(KERN_DEBUG "%s: enable receive to user "
 445                               "space\n", __func__);
 446                dsp->rx_disabled = 0;
 447                dsp_rx_off(dsp);
 448                break;
 449        case DSP_RECEIVE_OFF: /* disable receive to user space */
 450                if (dsp_debug & DEBUG_DSP_CORE)
 451                        printk(KERN_DEBUG "%s: disable receive to "
 452                               "user space\n", __func__);
 453                dsp->rx_disabled = 1;
 454                dsp_rx_off(dsp);
 455                break;
 456        case DSP_MIX_ON: /* enable mixing of tx data */
 457                if (dsp->hdlc) {
 458                        ret = -EINVAL;
 459                        break;
 460                }
 461                if (dsp_debug & DEBUG_DSP_CORE)
 462                        printk(KERN_DEBUG "%s: enable mixing of "
 463                               "tx-data with conf members\n", __func__);
 464                dsp->tx_mix = 1;
 465                dsp_cmx_hardware(dsp->conf, dsp);
 466                dsp_rx_off(dsp);
 467                if (dsp_debug & DEBUG_DSP_CMX)
 468                        dsp_cmx_debug(dsp);
 469                break;
 470        case DSP_MIX_OFF: /* disable mixing of tx data */
 471                if (dsp->hdlc) {
 472                        ret = -EINVAL;
 473                        break;
 474                }
 475                if (dsp_debug & DEBUG_DSP_CORE)
 476                        printk(KERN_DEBUG "%s: disable mixing of "
 477                               "tx-data with conf members\n", __func__);
 478                dsp->tx_mix = 0;
 479                dsp_cmx_hardware(dsp->conf, dsp);
 480                dsp_rx_off(dsp);
 481                if (dsp_debug & DEBUG_DSP_CMX)
 482                        dsp_cmx_debug(dsp);
 483                break;
 484        case DSP_TXDATA_ON: /* enable txdata */
 485                dsp->tx_data = 1;
 486                if (dsp_debug & DEBUG_DSP_CORE)
 487                        printk(KERN_DEBUG "%s: enable tx-data\n", __func__);
 488                dsp_cmx_hardware(dsp->conf, dsp);
 489                dsp_rx_off(dsp);
 490                if (dsp_debug & DEBUG_DSP_CMX)
 491                        dsp_cmx_debug(dsp);
 492                break;
 493        case DSP_TXDATA_OFF: /* disable txdata */
 494                dsp->tx_data = 0;
 495                if (dsp_debug & DEBUG_DSP_CORE)
 496                        printk(KERN_DEBUG "%s: disable tx-data\n", __func__);
 497                dsp_cmx_hardware(dsp->conf, dsp);
 498                dsp_rx_off(dsp);
 499                if (dsp_debug & DEBUG_DSP_CMX)
 500                        dsp_cmx_debug(dsp);
 501                break;
 502        case DSP_DELAY: /* use delay algorithm instead of dynamic
 503                           jitter algorithm */
 504                if (dsp->hdlc) {
 505                        ret = -EINVAL;
 506                        break;
 507                }
 508                if (len < sizeof(int)) {
 509                        ret = -EINVAL;
 510                        break;
 511                }
 512                dsp->cmx_delay = (*((int *)data)) << 3;
 513                /* milliseconds to samples */
 514                if (dsp->cmx_delay >= (CMX_BUFF_HALF >> 1))
 515                        /* clip to half of maximum usable buffer
 516                           (half of half buffer) */
 517                        dsp->cmx_delay = (CMX_BUFF_HALF >> 1) - 1;
 518                if (dsp_debug & DEBUG_DSP_CORE)
 519                        printk(KERN_DEBUG "%s: use delay algorithm to "
 520                               "compensate jitter (%d samples)\n",
 521                               __func__, dsp->cmx_delay);
 522                break;
 523        case DSP_JITTER: /* use dynamic jitter algorithm instead of
 524                            delay algorithm */
 525                if (dsp->hdlc) {
 526                        ret = -EINVAL;
 527                        break;
 528                }
 529                dsp->cmx_delay = 0;
 530                if (dsp_debug & DEBUG_DSP_CORE)
 531                        printk(KERN_DEBUG "%s: use jitter algorithm to "
 532                               "compensate jitter\n", __func__);
 533                break;
 534        case DSP_TX_DEJITTER: /* use dynamic jitter algorithm for tx-buffer */
 535                if (dsp->hdlc) {
 536                        ret = -EINVAL;
 537                        break;
 538                }
 539                dsp->tx_dejitter = 1;
 540                if (dsp_debug & DEBUG_DSP_CORE)
 541                        printk(KERN_DEBUG "%s: use dejitter on TX "
 542                               "buffer\n", __func__);
 543                break;
 544        case DSP_TX_DEJ_OFF: /* use tx-buffer without dejittering*/
 545                if (dsp->hdlc) {
 546                        ret = -EINVAL;
 547                        break;
 548                }
 549                dsp->tx_dejitter = 0;
 550                if (dsp_debug & DEBUG_DSP_CORE)
 551                        printk(KERN_DEBUG "%s: use TX buffer without "
 552                               "dejittering\n", __func__);
 553                break;
 554        case DSP_PIPELINE_CFG:
 555                if (dsp->hdlc) {
 556                        ret = -EINVAL;
 557                        break;
 558                }
 559                if (len > 0 && ((char *)data)[len - 1]) {
 560                        printk(KERN_DEBUG "%s: pipeline config string "
 561                               "is not NULL terminated!\n", __func__);
 562                        ret = -EINVAL;
 563                } else {
 564                        dsp->pipeline.inuse = 1;
 565                        dsp_cmx_hardware(dsp->conf, dsp);
 566                        ret = dsp_pipeline_build(&dsp->pipeline,
 567                                                 len > 0 ? data : NULL);
 568                        dsp_cmx_hardware(dsp->conf, dsp);
 569                        dsp_rx_off(dsp);
 570                }
 571                break;
 572        case DSP_BF_ENABLE_KEY: /* turn blowfish on */
 573                if (dsp->hdlc) {
 574                        ret = -EINVAL;
 575                        break;
 576                }
 577                if (len < 4 || len > 56) {
 578                        ret = -EINVAL;
 579                        break;
 580                }
 581                if (dsp_debug & DEBUG_DSP_CORE)
 582                        printk(KERN_DEBUG "%s: turn blowfish on (key "
 583                               "not shown)\n", __func__);
 584                ret = dsp_bf_init(dsp, (u8 *)data, len);
 585                /* set new cont */
 586                if (!ret)
 587                        cont = DSP_BF_ACCEPT;
 588                else
 589                        cont = DSP_BF_REJECT;
 590                /* send indication if it worked to set it */
 591                nskb = _alloc_mISDN_skb(PH_CONTROL_IND, MISDN_ID_ANY,
 592                                        sizeof(int), &cont, GFP_ATOMIC);
 593                if (nskb) {
 594                        if (dsp->up) {
 595                                if (dsp->up->send(dsp->up, nskb))
 596                                        dev_kfree_skb(nskb);
 597                        } else
 598                                dev_kfree_skb(nskb);
 599                }
 600                if (!ret) {
 601                        dsp_cmx_hardware(dsp->conf, dsp);
 602                        dsp_dtmf_hardware(dsp);
 603                        dsp_rx_off(dsp);
 604                }
 605                break;
 606        case DSP_BF_DISABLE: /* turn blowfish off */
 607                if (dsp->hdlc) {
 608                        ret = -EINVAL;
 609                        break;
 610                }
 611                if (dsp_debug & DEBUG_DSP_CORE)
 612                        printk(KERN_DEBUG "%s: turn blowfish off\n", __func__);
 613                dsp_bf_cleanup(dsp);
 614                dsp_cmx_hardware(dsp->conf, dsp);
 615                dsp_dtmf_hardware(dsp);
 616                dsp_rx_off(dsp);
 617                break;
 618        default:
 619                if (dsp_debug & DEBUG_DSP_CORE)
 620                        printk(KERN_DEBUG "%s: ctrl req %x unhandled\n",
 621                               __func__, cont);
 622                ret = -EINVAL;
 623        }
 624        return ret;
 625}
 626
 627static void
 628get_features(struct mISDNchannel *ch)
 629{
 630        struct dsp              *dsp = container_of(ch, struct dsp, ch);
 631        struct mISDN_ctrl_req   cq;
 632
 633        if (!ch->peer) {
 634                if (dsp_debug & DEBUG_DSP_CORE)
 635                        printk(KERN_DEBUG "%s: no peer, no features\n",
 636                               __func__);
 637                return;
 638        }
 639        memset(&cq, 0, sizeof(cq));
 640        cq.op = MISDN_CTRL_GETOP;
 641        if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq) < 0) {
 642                printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
 643                       __func__);
 644                return;
 645        }
 646        if (cq.op & MISDN_CTRL_RX_OFF)
 647                dsp->features_rx_off = 1;
 648        if (cq.op & MISDN_CTRL_FILL_EMPTY)
 649                dsp->features_fill_empty = 1;
 650        if (dsp_options & DSP_OPT_NOHARDWARE)
 651                return;
 652        if ((cq.op & MISDN_CTRL_HW_FEATURES_OP)) {
 653                cq.op = MISDN_CTRL_HW_FEATURES;
 654                *((u_long *)&cq.p1) = (u_long)&dsp->features;
 655                if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq)) {
 656                        printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
 657                               __func__);
 658                }
 659        } else
 660                if (dsp_debug & DEBUG_DSP_CORE)
 661                        printk(KERN_DEBUG "%s: features not supported for %s\n",
 662                               __func__, dsp->name);
 663}
 664
 665static int
 666dsp_function(struct mISDNchannel *ch,  struct sk_buff *skb)
 667{
 668        struct dsp              *dsp = container_of(ch, struct dsp, ch);
 669        struct mISDNhead        *hh;
 670        int                     ret = 0;
 671        u8                      *digits = NULL;
 672        u_long                  flags;
 673
 674        hh = mISDN_HEAD_P(skb);
 675        switch (hh->prim) {
 676                /* FROM DOWN */
 677        case (PH_DATA_CNF):
 678                dsp->data_pending = 0;
 679                /* trigger next hdlc frame, if any */
 680                if (dsp->hdlc) {
 681                        spin_lock_irqsave(&dsp_lock, flags);
 682                        if (dsp->b_active)
 683                                schedule_work(&dsp->workq);
 684                        spin_unlock_irqrestore(&dsp_lock, flags);
 685                }
 686                break;
 687        case (PH_DATA_IND):
 688        case (DL_DATA_IND):
 689                if (skb->len < 1) {
 690                        ret = -EINVAL;
 691                        break;
 692                }
 693                if (dsp->rx_is_off) {
 694                        if (dsp_debug & DEBUG_DSP_CORE)
 695                                printk(KERN_DEBUG "%s: rx-data during rx_off"
 696                                       " for %s\n",
 697                                       __func__, dsp->name);
 698                }
 699                if (dsp->hdlc) {
 700                        /* hdlc */
 701                        spin_lock_irqsave(&dsp_lock, flags);
 702                        dsp_cmx_hdlc(dsp, skb);
 703                        spin_unlock_irqrestore(&dsp_lock, flags);
 704                        if (dsp->rx_disabled) {
 705                                /* if receive is not allowed */
 706                                break;
 707                        }
 708                        hh->prim = DL_DATA_IND;
 709                        if (dsp->up)
 710                                return dsp->up->send(dsp->up, skb);
 711                        break;
 712                }
 713
 714                spin_lock_irqsave(&dsp_lock, flags);
 715
 716                /* decrypt if enabled */
 717                if (dsp->bf_enable)
 718                        dsp_bf_decrypt(dsp, skb->data, skb->len);
 719                /* pipeline */
 720                if (dsp->pipeline.inuse)
 721                        dsp_pipeline_process_rx(&dsp->pipeline, skb->data,
 722                                                skb->len, hh->id);
 723                /* change volume if requested */
 724                if (dsp->rx_volume)
 725                        dsp_change_volume(skb, dsp->rx_volume);
 726                /* check if dtmf soft decoding is turned on */
 727                if (dsp->dtmf.software) {
 728                        digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
 729                                                          skb->len, (dsp_options & DSP_OPT_ULAW) ? 1 : 0);
 730                }
 731                /* we need to process receive data if software */
 732                if (dsp->conf && dsp->conf->software) {
 733                        /* process data from card at cmx */
 734                        dsp_cmx_receive(dsp, skb);
 735                }
 736
 737                spin_unlock_irqrestore(&dsp_lock, flags);
 738
 739                /* send dtmf result, if any */
 740                if (digits) {
 741                        while (*digits) {
 742                                int k;
 743                                struct sk_buff *nskb;
 744                                if (dsp_debug & DEBUG_DSP_DTMF)
 745                                        printk(KERN_DEBUG "%s: digit"
 746                                               "(%c) to layer %s\n",
 747                                               __func__, *digits, dsp->name);
 748                                k = *digits | DTMF_TONE_VAL;
 749                                nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
 750                                                        MISDN_ID_ANY, sizeof(int), &k,
 751                                                        GFP_ATOMIC);
 752                                if (nskb) {
 753                                        if (dsp->up) {
 754                                                if (dsp->up->send(
 755                                                            dsp->up, nskb))
 756                                                        dev_kfree_skb(nskb);
 757                                        } else
 758                                                dev_kfree_skb(nskb);
 759                                }
 760                                digits++;
 761                        }
 762                }
 763                if (dsp->rx_disabled) {
 764                        /* if receive is not allowed */
 765                        break;
 766                }
 767                hh->prim = DL_DATA_IND;
 768                if (dsp->up)
 769                        return dsp->up->send(dsp->up, skb);
 770                break;
 771        case (PH_CONTROL_IND):
 772                if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
 773                        printk(KERN_DEBUG "%s: PH_CONTROL INDICATION "
 774                               "received: %x (len %d) %s\n", __func__,
 775                               hh->id, skb->len, dsp->name);
 776                switch (hh->id) {
 777                case (DTMF_HFC_COEF): /* getting coefficients */
 778                        if (!dsp->dtmf.hardware) {
 779                                if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
 780                                        printk(KERN_DEBUG "%s: ignoring DTMF "
 781                                               "coefficients from HFC\n",
 782                                               __func__);
 783                                break;
 784                        }
 785                        digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
 786                                                          skb->len, 2);
 787                        while (*digits) {
 788                                int k;
 789                                struct sk_buff *nskb;
 790                                if (dsp_debug & DEBUG_DSP_DTMF)
 791                                        printk(KERN_DEBUG "%s: digit"
 792                                               "(%c) to layer %s\n",
 793                                               __func__, *digits, dsp->name);
 794                                k = *digits | DTMF_TONE_VAL;
 795                                nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
 796                                                        MISDN_ID_ANY, sizeof(int), &k,
 797                                                        GFP_ATOMIC);
 798                                if (nskb) {
 799                                        if (dsp->up) {
 800                                                if (dsp->up->send(
 801                                                            dsp->up, nskb))
 802                                                        dev_kfree_skb(nskb);
 803                                        } else
 804                                                dev_kfree_skb(nskb);
 805                                }
 806                                digits++;
 807                        }
 808                        break;
 809                case (HFC_VOL_CHANGE_TX): /* change volume */
 810                        if (skb->len != sizeof(int)) {
 811                                ret = -EINVAL;
 812                                break;
 813                        }
 814                        spin_lock_irqsave(&dsp_lock, flags);
 815                        dsp->tx_volume = *((int *)skb->data);
 816                        if (dsp_debug & DEBUG_DSP_CORE)
 817                                printk(KERN_DEBUG "%s: change tx volume to "
 818                                       "%d\n", __func__, dsp->tx_volume);
 819                        dsp_cmx_hardware(dsp->conf, dsp);
 820                        dsp_dtmf_hardware(dsp);
 821                        dsp_rx_off(dsp);
 822                        spin_unlock_irqrestore(&dsp_lock, flags);
 823                        break;
 824                default:
 825                        if (dsp_debug & DEBUG_DSP_CORE)
 826                                printk(KERN_DEBUG "%s: ctrl ind %x unhandled "
 827                                       "%s\n", __func__, hh->id, dsp->name);
 828                        ret = -EINVAL;
 829                }
 830                break;
 831        case (PH_ACTIVATE_IND):
 832        case (PH_ACTIVATE_CNF):
 833                if (dsp_debug & DEBUG_DSP_CORE)
 834                        printk(KERN_DEBUG "%s: b_channel is now active %s\n",
 835                               __func__, dsp->name);
 836                /* bchannel now active */
 837                spin_lock_irqsave(&dsp_lock, flags);
 838                dsp->b_active = 1;
 839                dsp->data_pending = 0;
 840                dsp->rx_init = 1;
 841                /* rx_W and rx_R will be adjusted on first frame */
 842                dsp->rx_W = 0;
 843                dsp->rx_R = 0;
 844                memset(dsp->rx_buff, 0, sizeof(dsp->rx_buff));
 845                dsp_cmx_hardware(dsp->conf, dsp);
 846                dsp_dtmf_hardware(dsp);
 847                dsp_rx_off(dsp);
 848                spin_unlock_irqrestore(&dsp_lock, flags);
 849                if (dsp_debug & DEBUG_DSP_CORE)
 850                        printk(KERN_DEBUG "%s: done with activation, sending "
 851                               "confirm to user space. %s\n", __func__,
 852                               dsp->name);
 853                /* send activation to upper layer */
 854                hh->prim = DL_ESTABLISH_CNF;
 855                if (dsp->up)
 856                        return dsp->up->send(dsp->up, skb);
 857                break;
 858        case (PH_DEACTIVATE_IND):
 859        case (PH_DEACTIVATE_CNF):
 860                if (dsp_debug & DEBUG_DSP_CORE)
 861                        printk(KERN_DEBUG "%s: b_channel is now inactive %s\n",
 862                               __func__, dsp->name);
 863                /* bchannel now inactive */
 864                spin_lock_irqsave(&dsp_lock, flags);
 865                dsp->b_active = 0;
 866                dsp->data_pending = 0;
 867                dsp_cmx_hardware(dsp->conf, dsp);
 868                dsp_rx_off(dsp);
 869                spin_unlock_irqrestore(&dsp_lock, flags);
 870                hh->prim = DL_RELEASE_CNF;
 871                if (dsp->up)
 872                        return dsp->up->send(dsp->up, skb);
 873                break;
 874                /* FROM UP */
 875        case (DL_DATA_REQ):
 876        case (PH_DATA_REQ):
 877                if (skb->len < 1) {
 878                        ret = -EINVAL;
 879                        break;
 880                }
 881                if (dsp->hdlc) {
 882                        /* hdlc */
 883                        if (!dsp->b_active) {
 884                                ret = -EIO;
 885                                break;
 886                        }
 887                        hh->prim = PH_DATA_REQ;
 888                        spin_lock_irqsave(&dsp_lock, flags);
 889                        skb_queue_tail(&dsp->sendq, skb);
 890                        schedule_work(&dsp->workq);
 891                        spin_unlock_irqrestore(&dsp_lock, flags);
 892                        return 0;
 893                }
 894                /* send data to tx-buffer (if no tone is played) */
 895                if (!dsp->tone.tone) {
 896                        spin_lock_irqsave(&dsp_lock, flags);
 897                        dsp_cmx_transmit(dsp, skb);
 898                        spin_unlock_irqrestore(&dsp_lock, flags);
 899                }
 900                break;
 901        case (PH_CONTROL_REQ):
 902                spin_lock_irqsave(&dsp_lock, flags);
 903                ret = dsp_control_req(dsp, hh, skb);
 904                spin_unlock_irqrestore(&dsp_lock, flags);
 905                break;
 906        case (DL_ESTABLISH_REQ):
 907        case (PH_ACTIVATE_REQ):
 908                if (dsp_debug & DEBUG_DSP_CORE)
 909                        printk(KERN_DEBUG "%s: activating b_channel %s\n",
 910                               __func__, dsp->name);
 911                if (dsp->dtmf.hardware || dsp->dtmf.software)
 912                        dsp_dtmf_goertzel_init(dsp);
 913                get_features(ch);
 914                /* enable fill_empty feature */
 915                if (dsp->features_fill_empty)
 916                        dsp_fill_empty(dsp);
 917                /* send ph_activate */
 918                hh->prim = PH_ACTIVATE_REQ;
 919                if (ch->peer)
 920                        return ch->recv(ch->peer, skb);
 921                break;
 922        case (DL_RELEASE_REQ):
 923        case (PH_DEACTIVATE_REQ):
 924                if (dsp_debug & DEBUG_DSP_CORE)
 925                        printk(KERN_DEBUG "%s: releasing b_channel %s\n",
 926                               __func__, dsp->name);
 927                spin_lock_irqsave(&dsp_lock, flags);
 928                dsp->tone.tone = 0;
 929                dsp->tone.hardware = 0;
 930                dsp->tone.software = 0;
 931                if (timer_pending(&dsp->tone.tl))
 932                        del_timer(&dsp->tone.tl);
 933                if (dsp->conf)
 934                        dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be
 935                                                 called here */
 936                skb_queue_purge(&dsp->sendq);
 937                spin_unlock_irqrestore(&dsp_lock, flags);
 938                hh->prim = PH_DEACTIVATE_REQ;
 939                if (ch->peer)
 940                        return ch->recv(ch->peer, skb);
 941                break;
 942        default:
 943                if (dsp_debug & DEBUG_DSP_CORE)
 944                        printk(KERN_DEBUG "%s: msg %x unhandled %s\n",
 945                               __func__, hh->prim, dsp->name);
 946                ret = -EINVAL;
 947        }
 948        if (!ret)
 949                dev_kfree_skb(skb);
 950        return ret;
 951}
 952
 953static int
 954dsp_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
 955{
 956        struct dsp              *dsp = container_of(ch, struct dsp, ch);
 957        u_long          flags;
 958        int             err = 0;
 959
 960        if (debug & DEBUG_DSP_CTRL)
 961                printk(KERN_DEBUG "%s:(%x)\n", __func__, cmd);
 962
 963        switch (cmd) {
 964        case OPEN_CHANNEL:
 965                break;
 966        case CLOSE_CHANNEL:
 967                if (dsp->ch.peer)
 968                        dsp->ch.peer->ctrl(dsp->ch.peer, CLOSE_CHANNEL, NULL);
 969
 970                /* wait until workqueue has finished,
 971                 * must lock here, or we may hit send-process currently
 972                 * queueing. */
 973                spin_lock_irqsave(&dsp_lock, flags);
 974                dsp->b_active = 0;
 975                spin_unlock_irqrestore(&dsp_lock, flags);
 976                /* MUST not be locked, because it waits until queue is done. */
 977                cancel_work_sync(&dsp->workq);
 978                spin_lock_irqsave(&dsp_lock, flags);
 979                if (timer_pending(&dsp->tone.tl))
 980                        del_timer(&dsp->tone.tl);
 981                skb_queue_purge(&dsp->sendq);
 982                if (dsp_debug & DEBUG_DSP_CTRL)
 983                        printk(KERN_DEBUG "%s: releasing member %s\n",
 984                               __func__, dsp->name);
 985                dsp->b_active = 0;
 986                dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be called
 987                                         here */
 988                dsp_pipeline_destroy(&dsp->pipeline);
 989
 990                if (dsp_debug & DEBUG_DSP_CTRL)
 991                        printk(KERN_DEBUG "%s: remove & destroy object %s\n",
 992                               __func__, dsp->name);
 993                list_del(&dsp->list);
 994                spin_unlock_irqrestore(&dsp_lock, flags);
 995
 996                if (dsp_debug & DEBUG_DSP_CTRL)
 997                        printk(KERN_DEBUG "%s: dsp instance released\n",
 998                               __func__);
 999                vfree(dsp);
1000                module_put(THIS_MODULE);
1001                break;
1002        }
1003        return err;
1004}
1005
1006static void
1007dsp_send_bh(struct work_struct *work)
1008{
1009        struct dsp *dsp = container_of(work, struct dsp, workq);
1010        struct sk_buff *skb;
1011        struct mISDNhead        *hh;
1012
1013        if (dsp->hdlc && dsp->data_pending)
1014                return; /* wait until data has been acknowledged */
1015
1016        /* send queued data */
1017        while ((skb = skb_dequeue(&dsp->sendq))) {
1018                /* in locked date, we must have still data in queue */
1019                if (dsp->data_pending) {
1020                        if (dsp_debug & DEBUG_DSP_CORE)
1021                                printk(KERN_DEBUG "%s: fifo full %s, this is "
1022                                       "no bug!\n", __func__, dsp->name);
1023                        /* flush transparent data, if not acked */
1024                        dev_kfree_skb(skb);
1025                        continue;
1026                }
1027                hh = mISDN_HEAD_P(skb);
1028                if (hh->prim == DL_DATA_REQ) {
1029                        /* send packet up */
1030                        if (dsp->up) {
1031                                if (dsp->up->send(dsp->up, skb))
1032                                        dev_kfree_skb(skb);
1033                        } else
1034                                dev_kfree_skb(skb);
1035                } else {
1036                        /* send packet down */
1037                        if (dsp->ch.peer) {
1038                                dsp->data_pending = 1;
1039                                if (dsp->ch.recv(dsp->ch.peer, skb)) {
1040                                        dev_kfree_skb(skb);
1041                                        dsp->data_pending = 0;
1042                                }
1043                        } else
1044                                dev_kfree_skb(skb);
1045                }
1046        }
1047}
1048
1049static int
1050dspcreate(struct channel_req *crq)
1051{
1052        struct dsp              *ndsp;
1053        u_long          flags;
1054
1055        if (crq->protocol != ISDN_P_B_L2DSP
1056            && crq->protocol != ISDN_P_B_L2DSPHDLC)
1057                return -EPROTONOSUPPORT;
1058        ndsp = vzalloc(sizeof(struct dsp));
1059        if (!ndsp) {
1060                printk(KERN_ERR "%s: vmalloc struct dsp failed\n", __func__);
1061                return -ENOMEM;
1062        }
1063        if (dsp_debug & DEBUG_DSP_CTRL)
1064                printk(KERN_DEBUG "%s: creating new dsp instance\n", __func__);
1065
1066        /* default enabled */
1067        INIT_WORK(&ndsp->workq, (void *)dsp_send_bh);
1068        skb_queue_head_init(&ndsp->sendq);
1069        ndsp->ch.send = dsp_function;
1070        ndsp->ch.ctrl = dsp_ctrl;
1071        ndsp->up = crq->ch;
1072        crq->ch = &ndsp->ch;
1073        if (crq->protocol == ISDN_P_B_L2DSP) {
1074                crq->protocol = ISDN_P_B_RAW;
1075                ndsp->hdlc = 0;
1076        } else {
1077                crq->protocol = ISDN_P_B_HDLC;
1078                ndsp->hdlc = 1;
1079        }
1080        if (!try_module_get(THIS_MODULE))
1081                printk(KERN_WARNING "%s:cannot get module\n",
1082                       __func__);
1083
1084        sprintf(ndsp->name, "DSP_C%x(0x%p)",
1085                ndsp->up->st->dev->id + 1, ndsp);
1086        /* set frame size to start */
1087        ndsp->features.hfc_id = -1; /* current PCM id */
1088        ndsp->features.pcm_id = -1; /* current PCM id */
1089        ndsp->pcm_slot_rx = -1; /* current CPM slot */
1090        ndsp->pcm_slot_tx = -1;
1091        ndsp->pcm_bank_rx = -1;
1092        ndsp->pcm_bank_tx = -1;
1093        ndsp->hfc_conf = -1; /* current conference number */
1094        /* set tone timer */
1095        ndsp->tone.tl.function = (void *)dsp_tone_timeout;
1096        ndsp->tone.tl.data = (long) ndsp;
1097        init_timer(&ndsp->tone.tl);
1098
1099        if (dtmfthreshold < 20 || dtmfthreshold > 500)
1100                dtmfthreshold = 200;
1101        ndsp->dtmf.treshold = dtmfthreshold * 10000;
1102
1103        /* init pipeline append to list */
1104        spin_lock_irqsave(&dsp_lock, flags);
1105        dsp_pipeline_init(&ndsp->pipeline);
1106        list_add_tail(&ndsp->list, &dsp_ilist);
1107        spin_unlock_irqrestore(&dsp_lock, flags);
1108
1109        return 0;
1110}
1111
1112
1113static struct Bprotocol DSP = {
1114        .Bprotocols = (1 << (ISDN_P_B_L2DSP & ISDN_P_B_MASK))
1115        | (1 << (ISDN_P_B_L2DSPHDLC & ISDN_P_B_MASK)),
1116        .name = "dsp",
1117        .create = dspcreate
1118};
1119
1120static int __init dsp_init(void)
1121{
1122        int err;
1123        int tics;
1124
1125        printk(KERN_INFO "DSP module %s\n", mISDN_dsp_revision);
1126
1127        dsp_options = options;
1128        dsp_debug = debug;
1129
1130        /* set packet size */
1131        dsp_poll = poll;
1132        if (dsp_poll) {
1133                if (dsp_poll > MAX_POLL) {
1134                        printk(KERN_ERR "%s: Wrong poll value (%d), use %d "
1135                               "maximum.\n", __func__, poll, MAX_POLL);
1136                        err = -EINVAL;
1137                        return err;
1138                }
1139                if (dsp_poll < 8) {
1140                        printk(KERN_ERR "%s: Wrong poll value (%d), use 8 "
1141                               "minimum.\n", __func__, dsp_poll);
1142                        err = -EINVAL;
1143                        return err;
1144                }
1145                dsp_tics = poll * HZ / 8000;
1146                if (dsp_tics * 8000 != poll * HZ) {
1147                        printk(KERN_INFO "mISDN_dsp: Cannot clock every %d "
1148                               "samples (0,125 ms). It is not a multiple of "
1149                               "%d HZ.\n", poll, HZ);
1150                        err = -EINVAL;
1151                        return err;
1152                }
1153        } else {
1154                poll = 8;
1155                while (poll <= MAX_POLL) {
1156                        tics = (poll * HZ) / 8000;
1157                        if (tics * 8000 == poll * HZ) {
1158                                dsp_tics = tics;
1159                                dsp_poll = poll;
1160                                if (poll >= 64)
1161                                        break;
1162                        }
1163                        poll++;
1164                }
1165        }
1166        if (dsp_poll == 0) {
1167                printk(KERN_INFO "mISDN_dsp: There is no multiple of kernel "
1168                       "clock that equals exactly the duration of 8-256 "
1169                       "samples. (Choose kernel clock speed like 100, 250, "
1170                       "300, 1000)\n");
1171                err = -EINVAL;
1172                return err;
1173        }
1174        printk(KERN_INFO "mISDN_dsp: DSP clocks every %d samples. This equals "
1175               "%d jiffies.\n", dsp_poll, dsp_tics);
1176
1177        spin_lock_init(&dsp_lock);
1178        INIT_LIST_HEAD(&dsp_ilist);
1179        INIT_LIST_HEAD(&conf_ilist);
1180
1181        /* init conversion tables */
1182        dsp_audio_generate_law_tables();
1183        dsp_silence = (dsp_options & DSP_OPT_ULAW) ? 0xff : 0x2a;
1184        dsp_audio_law_to_s32 = (dsp_options & DSP_OPT_ULAW) ?
1185                dsp_audio_ulaw_to_s32 : dsp_audio_alaw_to_s32;
1186        dsp_audio_generate_s2law_table();
1187        dsp_audio_generate_seven();
1188        dsp_audio_generate_mix_table();
1189        if (dsp_options & DSP_OPT_ULAW)
1190                dsp_audio_generate_ulaw_samples();
1191        dsp_audio_generate_volume_changes();
1192
1193        err = dsp_pipeline_module_init();
1194        if (err) {
1195                printk(KERN_ERR "mISDN_dsp: Can't initialize pipeline, "
1196                       "error(%d)\n", err);
1197                return err;
1198        }
1199
1200        err = mISDN_register_Bprotocol(&DSP);
1201        if (err) {
1202                printk(KERN_ERR "Can't register %s error(%d)\n", DSP.name, err);
1203                return err;
1204        }
1205
1206        /* set sample timer */
1207        dsp_spl_tl.function = (void *)dsp_cmx_send;
1208        dsp_spl_tl.data = 0;
1209        init_timer(&dsp_spl_tl);
1210        dsp_spl_tl.expires = jiffies + dsp_tics;
1211        dsp_spl_jiffies = dsp_spl_tl.expires;
1212        add_timer(&dsp_spl_tl);
1213
1214        return 0;
1215}
1216
1217
1218static void __exit dsp_cleanup(void)
1219{
1220        mISDN_unregister_Bprotocol(&DSP);
1221
1222        del_timer_sync(&dsp_spl_tl);
1223
1224        if (!list_empty(&dsp_ilist)) {
1225                printk(KERN_ERR "mISDN_dsp: Audio DSP object inst list not "
1226                       "empty.\n");
1227        }
1228        if (!list_empty(&conf_ilist)) {
1229                printk(KERN_ERR "mISDN_dsp: Conference list not empty. Not "
1230                       "all memory freed.\n");
1231        }
1232
1233        dsp_pipeline_module_exit();
1234}
1235
1236module_init(dsp_init);
1237module_exit(dsp_cleanup);
1238