git.oblomov.eu Git - linux-2.6/blob - 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                 spin_lock_irqsave(&dsp_lock, flags);
 708
 709                 /* decrypt if enabled */
 710                 if (dsp->bf_enable)
 711                         dsp_bf_decrypt(dsp, skb->data, skb->len);
 712                 /* pipeline */
 713                 if (dsp->pipeline.inuse)
 714                         dsp_pipeline_process_rx(&dsp->pipeline, skb->data,
 715                                 skb->len, hh->id);
 716                 /* change volume if requested */
 717                 if (dsp->rx_volume)
 718                         dsp_change_volume(skb, dsp->rx_volume);
 719
 720                 /* check if dtmf soft decoding is turned on */
 721                 if (dsp->dtmf.software) {
 722                         digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
 723                                 skb->len, (dsp_options&DSP_OPT_ULAW)?1:0);
 724                         while (*digits) {
 725                                 struct sk_buff *nskb;
 726                                 if (dsp_debug & DEBUG_DSP_DTMF)
 727                                         printk(KERN_DEBUG "%s: digit"
 728                                             "(%c) to layer %s\n",
 729                                             __func__, *digits, dsp->name);
 730                                 cont = DTMF_TONE_VAL | *digits;
 731                                 nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
 732                                     MISDN_ID_ANY, sizeof(int), &cont,
 733                                     GFP_ATOMIC);
 734                                 if (nskb) {
 735                                         if (dsp->up) {
 736                                                 if (dsp->up->send(
 737                                                     dsp->up, nskb))
 738                                                 dev_kfree_skb(nskb);
 739                                         } else
 740                                                 dev_kfree_skb(nskb);
 741                                 }
 742                                 digits++;
 743                         }
 744                 }
 745                 /* we need to process receive data if software */
 746                 if (dsp->pcm_slot_tx < 0 && dsp->pcm_slot_rx < 0) {
 747                         /* process data from card at cmx */
 748                         dsp_cmx_receive(dsp, skb);
 749                 }
 750
 751                 spin_unlock_irqrestore(&dsp_lock, flags);
 752
 753                 if (dsp->rx_disabled) {
 754                         /* if receive is not allowed */
 755                         break;
 756                 }
 757                 hh->prim = DL_DATA_IND;
 758                 if (dsp->up)
 759                         return dsp->up->send(dsp->up, skb);
 760                 break;
 761         case (PH_CONTROL_IND):
 762                 if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
 763                         printk(KERN_DEBUG "%s: PH_CONTROL INDICATION "
 764                                 "received: %x (len %d) %s\n", __func__,
 765                                 hh->id, skb->len, dsp->name);
 766                 switch (hh->id) {
 767                 case (DTMF_HFC_COEF): /* getting coefficients */
 768                         if (!dsp->dtmf.hardware) {
 769                                 if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
 770                                         printk(KERN_DEBUG "%s: ignoring DTMF "
 771                                                 "coefficients from HFC\n",
 772                                                 __func__);
 773                                 break;
 774                         }
 775                         digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
 776                                 skb->len, 2);
 777                         while (*digits) {
 778                                 int k;
 779                                 struct sk_buff *nskb;
 780                                 if (dsp_debug & DEBUG_DSP_DTMF)
 781                                         printk(KERN_DEBUG "%s: digit"
 782                                             "(%c) to layer %s\n",
 783                                             __func__, *digits, dsp->name);
 784                                 k = *digits | DTMF_TONE_VAL;
 785                                 nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
 786                                         MISDN_ID_ANY, sizeof(int), &k,
 787                                         GFP_ATOMIC);
 788                                 if (nskb) {
 789                                         if (dsp->up) {
 790                                                 if (dsp->up->send(
 791                                                     dsp->up, nskb))
 792                                                 dev_kfree_skb(nskb);
 793                                         } else
 794                                                 dev_kfree_skb(nskb);
 795                                 }
 796                                 digits++;
 797                         }
 798                         break;
 799                 case (HFC_VOL_CHANGE_TX): /* change volume */
 800                         if (skb->len != sizeof(int)) {
 801                                 ret = -EINVAL;
 802                                 break;
 803                         }
 804                         spin_lock_irqsave(&dsp_lock, flags);
 805                         dsp->tx_volume = *((int *)skb->data);
 806                         if (dsp_debug & DEBUG_DSP_CORE)
 807                                 printk(KERN_DEBUG "%s: change tx volume to "
 808                                         "%d\n", __func__, dsp->tx_volume);
 809                         dsp_cmx_hardware(dsp->conf, dsp);
 810                         dsp_dtmf_hardware(dsp);
 811                         dsp_rx_off(dsp);
 812                         spin_unlock_irqrestore(&dsp_lock, flags);
 813                         break;
 814                 default:
 815                         if (dsp_debug & DEBUG_DSP_CORE)
 816                                 printk(KERN_DEBUG "%s: ctrl ind %x unhandled "
 817                                         "%s\n", __func__, hh->id, dsp->name);
 818                         ret = -EINVAL;
 819                 }
 820                 break;
 821         case (PH_ACTIVATE_IND):
 822         case (PH_ACTIVATE_CNF):
 823                 if (dsp_debug & DEBUG_DSP_CORE)
 824                         printk(KERN_DEBUG "%s: b_channel is now active %s\n",
 825                                 __func__, dsp->name);
 826                 /* bchannel now active */
 827                 spin_lock_irqsave(&dsp_lock, flags);
 828                 dsp->b_active = 1;
 829                 dsp->data_pending = 0;
 830                 dsp->rx_init = 1;
 831                         /* rx_W and rx_R will be adjusted on first frame */
 832                 dsp->rx_W = 0;
 833                 dsp->rx_R = 0;
 834                 memset(dsp->rx_buff, 0, sizeof(dsp->rx_buff));
 835                 dsp_cmx_hardware(dsp->conf, dsp);
 836                 dsp_dtmf_hardware(dsp);
 837                 dsp_rx_off(dsp);
 838                 spin_unlock_irqrestore(&dsp_lock, flags);
 839                 if (dsp_debug & DEBUG_DSP_CORE)
 840                         printk(KERN_DEBUG "%s: done with activation, sending "
 841                                 "confirm to user space. %s\n", __func__,
 842                                 dsp->name);
 843                 /* send activation to upper layer */
 844                 hh->prim = DL_ESTABLISH_CNF;
 845                 if (dsp->up)
 846                         return dsp->up->send(dsp->up, skb);
 847                 break;
 848         case (PH_DEACTIVATE_IND):
 849         case (PH_DEACTIVATE_CNF):
 850                 if (dsp_debug & DEBUG_DSP_CORE)
 851                         printk(KERN_DEBUG "%s: b_channel is now inactive %s\n",
 852                                 __func__, dsp->name);
 853                 /* bchannel now inactive */
 854                 spin_lock_irqsave(&dsp_lock, flags);
 855                 dsp->b_active = 0;
 856                 dsp->data_pending = 0;
 857                 dsp_cmx_hardware(dsp->conf, dsp);
 858                 dsp_rx_off(dsp);
 859                 spin_unlock_irqrestore(&dsp_lock, flags);
 860                 hh->prim = DL_RELEASE_CNF;
 861                 if (dsp->up)
 862                         return dsp->up->send(dsp->up, skb);
 863                 break;
 864         /* FROM UP */
 865         case (DL_DATA_REQ):
 866         case (PH_DATA_REQ):
 867                 if (skb->len < 1) {
 868                         ret = -EINVAL;
 869                         break;
 870                 }
 871                 if (dsp->hdlc) {
 872                         /* hdlc */
 873                         if (!dsp->b_active) {
 874                                 ret = -EIO;
 875                                 break;
 876                         }
 877                         hh->prim = PH_DATA_REQ;
 878                         spin_lock_irqsave(&dsp_lock, flags);
 879                         skb_queue_tail(&dsp->sendq, skb);
 880                         schedule_work(&dsp->workq);
 881                         spin_unlock_irqrestore(&dsp_lock, flags);
 882                         return 0;
 883                 }
 884                 /* send data to tx-buffer (if no tone is played) */
 885                 if (!dsp->tone.tone) {
 886                         spin_lock_irqsave(&dsp_lock, flags);
 887                         dsp_cmx_transmit(dsp, skb);
 888                         spin_unlock_irqrestore(&dsp_lock, flags);
 889                 }
 890                 break;
 891         case (PH_CONTROL_REQ):
 892                 spin_lock_irqsave(&dsp_lock, flags);
 893                 ret = dsp_control_req(dsp, hh, skb);
 894                 spin_unlock_irqrestore(&dsp_lock, flags);
 895                 break;
 896         case (DL_ESTABLISH_REQ):
 897         case (PH_ACTIVATE_REQ):
 898                 if (dsp_debug & DEBUG_DSP_CORE)
 899                         printk(KERN_DEBUG "%s: activating b_channel %s\n",
 900                                 __func__, dsp->name);
 901                 if (dsp->dtmf.hardware || dsp->dtmf.software)
 902                         dsp_dtmf_goertzel_init(dsp);
 903                 get_features(ch);
 904                 /* enable fill_empty feature */
 905                 if (dsp->features_fill_empty)
 906                         dsp_fill_empty(dsp);
 907                 /* send ph_activate */
 908                 hh->prim = PH_ACTIVATE_REQ;
 909                 if (ch->peer)
 910                         return ch->recv(ch->peer, skb);
 911                 break;
 912         case (DL_RELEASE_REQ):
 913         case (PH_DEACTIVATE_REQ):
 914                 if (dsp_debug & DEBUG_DSP_CORE)
 915                         printk(KERN_DEBUG "%s: releasing b_channel %s\n",
 916                                 __func__, dsp->name);
 917                 spin_lock_irqsave(&dsp_lock, flags);
 918                 dsp->tone.tone = 0;
 919                 dsp->tone.hardware = 0;
 920                 dsp->tone.software = 0;
 921                 if (timer_pending(&dsp->tone.tl))
 922                         del_timer(&dsp->tone.tl);
 923                 if (dsp->conf)
 924                         dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be
 925                                                  called here */
 926                 skb_queue_purge(&dsp->sendq);
 927                 spin_unlock_irqrestore(&dsp_lock, flags);
 928                 hh->prim = PH_DEACTIVATE_REQ;
 929                 if (ch->peer)
 930                         return ch->recv(ch->peer, skb);
 931                 break;
 932         default:
 933                 if (dsp_debug & DEBUG_DSP_CORE)
 934                         printk(KERN_DEBUG "%s: msg %x unhandled %s\n",
 935                                 __func__, hh->prim, dsp->name);
 936                 ret = -EINVAL;
 937         }
 938         if (!ret)
 939                 dev_kfree_skb(skb);
 940         return ret;
 941 }
 942
 943 static int
 944 dsp_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
 945 {
 946         struct dsp              *dsp = container_of(ch, struct dsp, ch);
 947         u_long          flags;
 948         int             err = 0;
 949
 950         if (debug & DEBUG_DSP_CTRL)
 951         printk(KERN_DEBUG "%s:(%x)\n", __func__, cmd);
 952
 953         switch (cmd) {
 954         case OPEN_CHANNEL:
 955                 break;
 956         case CLOSE_CHANNEL:
 957                 if (dsp->ch.peer)
 958                         dsp->ch.peer->ctrl(dsp->ch.peer, CLOSE_CHANNEL, NULL);
 959
 960                 /* wait until workqueue has finished,
 961                  * must lock here, or we may hit send-process currently
 962                  * queueing. */
 963                 spin_lock_irqsave(&dsp_lock, flags);
 964                 dsp->b_active = 0;
 965                 spin_unlock_irqrestore(&dsp_lock, flags);
 966                 /* MUST not be locked, because it waits until queue is done. */
 967                 cancel_work_sync(&dsp->workq);
 968                 spin_lock_irqsave(&dsp_lock, flags);
 969                 if (timer_pending(&dsp->tone.tl))
 970                         del_timer(&dsp->tone.tl);
 971                 skb_queue_purge(&dsp->sendq);
 972                 if (dsp_debug & DEBUG_DSP_CTRL)
 973                         printk(KERN_DEBUG "%s: releasing member %s\n",
 974                                 __func__, dsp->name);
 975                 dsp->b_active = 0;
 976                 dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be called
 977                                          here */
 978                 dsp_pipeline_destroy(&dsp->pipeline);
 979
 980                 if (dsp_debug & DEBUG_DSP_CTRL)
 981                         printk(KERN_DEBUG "%s: remove & destroy object %s\n",
 982                                 __func__, dsp->name);
 983                 list_del(&dsp->list);
 984                 spin_unlock_irqrestore(&dsp_lock, flags);
 985
 986                 if (dsp_debug & DEBUG_DSP_CTRL)
 987                         printk(KERN_DEBUG "%s: dsp instance released\n",
 988                                 __func__);
 989                 vfree(dsp);
 990                 module_put(THIS_MODULE);
 991                 break;
 992         }
 993         return err;
 994 }
 995
 996 static void
 997 dsp_send_bh(struct work_struct *work)
 998 {
 999         struct dsp *dsp = container_of(work, struct dsp, workq);
1000         struct sk_buff *skb;
1001         struct mISDNhead        *hh;
1002
1003         if (dsp->hdlc && dsp->data_pending)
1004                 return; /* wait until data has been acknowledged */
1005
1006         /* send queued data */
1007         while ((skb = skb_dequeue(&dsp->sendq))) {
1008                 /* in locked date, we must have still data in queue */
1009                 if (dsp->data_pending) {
1010                         if (dsp_debug & DEBUG_DSP_CORE)
1011                                 printk(KERN_DEBUG "%s: fifo full %s, this is "
1012                                         "no bug!\n", __func__, dsp->name);
1013                         /* flush transparent data, if not acked */
1014                         dev_kfree_skb(skb);
1015                         continue;
1016                 }
1017                 hh = mISDN_HEAD_P(skb);
1018                 if (hh->prim == DL_DATA_REQ) {
1019                         /* send packet up */
1020                         if (dsp->up) {
1021                                 if (dsp->up->send(dsp->up, skb))
1022                                         dev_kfree_skb(skb);
1023                         } else
1024                                 dev_kfree_skb(skb);
1025                 } else {
1026                         /* send packet down */
1027                         if (dsp->ch.peer) {
1028                                 dsp->data_pending = 1;
1029                                 if (dsp->ch.recv(dsp->ch.peer, skb)) {
1030                                         dev_kfree_skb(skb);
1031                                         dsp->data_pending = 0;
1032                                 }
1033                         } else
1034                                 dev_kfree_skb(skb);
1035                 }
1036         }
1037 }
1038
1039 static int
1040 dspcreate(struct channel_req *crq)
1041 {
1042         struct dsp              *ndsp;
1043         u_long          flags;
1044
1045         if (crq->protocol != ISDN_P_B_L2DSP
1046          && crq->protocol != ISDN_P_B_L2DSPHDLC)
1047                 return -EPROTONOSUPPORT;
1048         ndsp = vmalloc(sizeof(struct dsp));
1049         if (!ndsp) {
1050                 printk(KERN_ERR "%s: vmalloc struct dsp failed\n", __func__);
1051                 return -ENOMEM;
1052         }
1053         memset(ndsp, 0, sizeof(struct dsp));
1054         if (dsp_debug & DEBUG_DSP_CTRL)
1055                 printk(KERN_DEBUG "%s: creating new dsp instance\n", __func__);
1056
1057         /* default enabled */
1058         INIT_WORK(&ndsp->workq, (void *)dsp_send_bh);
1059         skb_queue_head_init(&ndsp->sendq);
1060         ndsp->ch.send = dsp_function;
1061         ndsp->ch.ctrl = dsp_ctrl;
1062         ndsp->up = crq->ch;
1063         crq->ch = &ndsp->ch;
1064         if (crq->protocol == ISDN_P_B_L2DSP) {
1065                 crq->protocol = ISDN_P_B_RAW;
1066                 ndsp->hdlc = 0;
1067         } else {
1068                 crq->protocol = ISDN_P_B_HDLC;
1069                 ndsp->hdlc = 1;
1070         }
1071         if (!try_module_get(THIS_MODULE))
1072                 printk(KERN_WARNING "%s:cannot get module\n",
1073                         __func__);
1074
1075         sprintf(ndsp->name, "DSP_C%x(0x%p)",
1076                 ndsp->up->st->dev->id + 1, ndsp);
1077         /* set frame size to start */
1078         ndsp->features.hfc_id = -1; /* current PCM id */
1079         ndsp->features.pcm_id = -1; /* current PCM id */
1080         ndsp->pcm_slot_rx = -1; /* current CPM slot */
1081         ndsp->pcm_slot_tx = -1;
1082         ndsp->pcm_bank_rx = -1;
1083         ndsp->pcm_bank_tx = -1;
1084         ndsp->hfc_conf = -1; /* current conference number */
1085         /* set tone timer */
1086         ndsp->tone.tl.function = (void *)dsp_tone_timeout;
1087         ndsp->tone.tl.data = (long) ndsp;
1088         init_timer(&ndsp->tone.tl);
1089
1090         if (dtmfthreshold < 20 || dtmfthreshold > 500)
1091                 dtmfthreshold = 200;
1092         ndsp->dtmf.treshold = dtmfthreshold*10000;
1093
1094         /* init pipeline append to list */
1095         spin_lock_irqsave(&dsp_lock, flags);
1096         dsp_pipeline_init(&ndsp->pipeline);
1097         list_add_tail(&ndsp->list, &dsp_ilist);
1098         spin_unlock_irqrestore(&dsp_lock, flags);
1099
1100         return 0;
1101 }
1102
1103
1104 static struct Bprotocol DSP = {
1105         .Bprotocols = (1 << (ISDN_P_B_L2DSP & ISDN_P_B_MASK))
1106                 | (1 << (ISDN_P_B_L2DSPHDLC & ISDN_P_B_MASK)),
1107         .name = "dsp",
1108         .create = dspcreate
1109 };
1110
1111 static int dsp_init(void)
1112 {
1113         int err;
1114         int tics;
1115
1116         printk(KERN_INFO "DSP modul %s\n", mISDN_dsp_revision);
1117
1118         dsp_options = options;
1119         dsp_debug = debug;
1120
1121         /* set packet size */
1122         dsp_poll = poll;
1123         if (dsp_poll) {
1124                 if (dsp_poll > MAX_POLL) {
1125                         printk(KERN_ERR "%s: Wrong poll value (%d), use %d "
1126                                 "maximum.\n", __func__, poll, MAX_POLL);
1127                         err = -EINVAL;
1128                         return err;
1129                 }
1130                 if (dsp_poll < 8) {
1131                         printk(KERN_ERR "%s: Wrong poll value (%d), use 8 "
1132                                 "minimum.\n", __func__, dsp_poll);
1133                         err = -EINVAL;
1134                         return err;
1135                 }
1136                 dsp_tics = poll * HZ / 8000;
1137                 if (dsp_tics * 8000 != poll * HZ) {
1138                         printk(KERN_INFO "mISDN_dsp: Cannot clock every %d "
1139                                 "samples (0,125 ms). It is not a multiple of "
1140                                 "%d HZ.\n", poll, HZ);
1141                         err = -EINVAL;
1142                         return err;
1143                 }
1144         } else {
1145                 poll = 8;
1146                 while (poll <= MAX_POLL) {
1147                         tics = (poll * HZ) / 8000;
1148                         if (tics * 8000 == poll * HZ) {
1149                                 dsp_tics = tics;
1150                                 dsp_poll = poll;
1151                                 if (poll >= 64)
1152                                         break;
1153                         }
1154                         poll++;
1155                 }
1156         }
1157         if (dsp_poll == 0) {
1158                 printk(KERN_INFO "mISDN_dsp: There is no multiple of kernel "
1159                         "clock that equals exactly the duration of 8-256 "
1160                         "samples. (Choose kernel clock speed like 100, 250, "
1161                         "300, 1000)\n");
1162                 err = -EINVAL;
1163                 return err;
1164         }
1165         printk(KERN_INFO "mISDN_dsp: DSP clocks every %d samples. This equals "
1166                 "%d jiffies.\n", dsp_poll, dsp_tics);
1167
1168         spin_lock_init(&dsp_lock);
1169         INIT_LIST_HEAD(&dsp_ilist);
1170         INIT_LIST_HEAD(&conf_ilist);
1171
1172         /* init conversion tables */
1173         dsp_audio_generate_law_tables();
1174         dsp_silence = (dsp_options&DSP_OPT_ULAW)?0xff:0x2a;
1175         dsp_audio_law_to_s32 = (dsp_options&DSP_OPT_ULAW)?dsp_audio_ulaw_to_s32:
1176                 dsp_audio_alaw_to_s32;
1177         dsp_audio_generate_s2law_table();
1178         dsp_audio_generate_seven();
1179         dsp_audio_generate_mix_table();
1180         if (dsp_options & DSP_OPT_ULAW)
1181                 dsp_audio_generate_ulaw_samples();
1182         dsp_audio_generate_volume_changes();
1183
1184         err = dsp_pipeline_module_init();
1185         if (err) {
1186                 printk(KERN_ERR "mISDN_dsp: Can't initialize pipeline, "
1187                         "error(%d)\n", err);
1188                 return err;
1189         }
1190
1191         err = mISDN_register_Bprotocol(&DSP);
1192         if (err) {
1193                 printk(KERN_ERR "Can't register %s error(%d)\n", DSP.name, err);
1194                 return err;
1195         }
1196
1197         /* set sample timer */
1198         dsp_spl_tl.function = (void *)dsp_cmx_send;
1199         dsp_spl_tl.data = 0;
1200         init_timer(&dsp_spl_tl);
1201         dsp_spl_tl.expires = jiffies + dsp_tics;
1202         dsp_spl_jiffies = dsp_spl_tl.expires;
1203         add_timer(&dsp_spl_tl);
1204
1205         return 0;
1206 }
1207
1208
1209 static void dsp_cleanup(void)
1210 {
1211         mISDN_unregister_Bprotocol(&DSP);
1212
1213         if (timer_pending(&dsp_spl_tl))
1214                 del_timer(&dsp_spl_tl);
1215
1216         if (!list_empty(&dsp_ilist)) {
1217                 printk(KERN_ERR "mISDN_dsp: Audio DSP object inst list not "
1218                         "empty.\n");
1219         }
1220         if (!list_empty(&conf_ilist)) {
1221                 printk(KERN_ERR "mISDN_dsp: Conference list not empty. Not "
1222                         "all memory freed.\n");
1223         }
1224
1225         dsp_pipeline_module_exit();
1226 }
1227
1228 module_init(dsp_init);
1229 module_exit(dsp_cleanup);
1230