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 *
   8 * Thanks to    Karsten Keil (great drivers)
   9 *              Cologne Chip (great chips)
  10 *
  11 * This module does:
  12 *		Real-time tone generation
  13 *		DTMF detection
  14 *		Real-time cross-connection and conferrence
  15 *		Compensate jitter due to system load and hardware fault.
  16 *		All features are done in kernel space and will be realized
  17 *		using hardware, if available and supported by chip set.
  18 *		Blowfish encryption/decryption
  19 */
  20
  21/* STRUCTURE:
  22 *
  23 * The dsp module provides layer 2 for b-channels (64kbit). It provides
  24 * transparent audio forwarding with special digital signal processing:
  25 *
  26 * - (1) generation of tones
  27 * - (2) detection of dtmf tones
  28 * - (3) crossconnecting and conferences (clocking)
  29 * - (4) echo generation for delay test
  30 * - (5) volume control
  31 * - (6) disable receive data
  32 * - (7) pipeline
  33 * - (8) encryption/decryption
  34 *
  35 * Look:
  36 *             TX            RX
  37 *         ------upper layer------
  38 *             |             ^
  39 *             |             |(6)
  40 *             v             |
  41 *       +-----+-------------+-----+
  42 *       |(3)(4)                   |
  43 *       |           CMX           |
  44 *       |                         |
  45 *       |           +-------------+
  46 *       |           |       ^
  47 *       |           |       |
  48 *       |+---------+|  +----+----+
  49 *       ||(1)      ||  |(2)      |
  50 *       ||         ||  |         |
  51 *       ||  Tones  ||  |  DTMF   |
  52 *       ||         ||  |         |
  53 *       ||         ||  |         |
  54 *       |+----+----+|  +----+----+
  55 *       +-----+-----+       ^
  56 *             |             |
  57 *             v             |
  58 *        +----+----+   +----+----+
  59 *        |(5)      |   |(5)      |
  60 *        |         |   |         |
  61 *        |TX Volume|   |RX Volume|
  62 *        |         |   |         |
  63 *        |         |   |         |
  64 *        +----+----+   +----+----+
  65 *             |             ^
  66 *             |             |
  67 *             v             |
  68 *        +----+-------------+----+
  69 *        |(7)                    |
  70 *        |                       |
  71 *        |  Pipeline Processing  |
  72 *        |                       |
  73 *        |                       |
  74 *        +----+-------------+----+
  75 *             |             ^
  76 *             |             |
  77 *             v             |
  78 *        +----+----+   +----+----+
  79 *        |(8)      |   |(8)      |
  80 *        |         |   |         |
  81 *        | Encrypt |   | Decrypt |
  82 *        |         |   |         |
  83 *        |         |   |         |
  84 *        +----+----+   +----+----+
  85 *             |             ^
  86 *             |             |
  87 *             v             |
  88 *         ------card  layer------
  89 *             TX            RX
  90 *
  91 * Above you can see the logical data flow. If software is used to do the
  92 * process, it is actually the real data flow. If hardware is used, data
  93 * may not flow, but hardware commands to the card, to provide the data flow
  94 * as shown.
  95 *
  96 * NOTE: The channel must be activated in order to make dsp work, even if
  97 * no data flow to the upper layer is intended. Activation can be done
  98 * after and before controlling the setting using PH_CONTROL requests.
  99 *
 100 * DTMF: Will be detected by hardware if possible. It is done before CMX
 101 * processing.
 102 *
 103 * Tones: Will be generated via software if endless looped audio fifos are
 104 * not supported by hardware. Tones will override all data from CMX.
 105 * It is not required to join a conference to use tones at any time.
 106 *
 107 * CMX: Is transparent when not used. When it is used, it will do
 108 * crossconnections and conferences via software if not possible through
 109 * hardware. If hardware capability is available, hardware is used.
 110 *
 111 * Echo: Is generated by CMX and is used to check performance of hard and
 112 * software CMX.
 113 *
 114 * The CMX has special functions for conferences with one, two and more
 115 * members. It will allow different types of data flow. Receive and transmit
 116 * data to/form upper layer may be switched on/off individually without losing
 117 * features of CMX, Tones and DTMF.
 118 *
 119 * Echo Cancellation: Sometimes we like to cancel echo from the interface.
 120 * Note that a VoIP call may not have echo caused by the IP phone. The echo
 121 * is generated by the telephone line connected to it. Because the delay
 122 * is high, it becomes an echo. RESULT: Echo Cachelation is required if
 123 * both echo AND delay is applied to an interface.
 124 * Remember that software CMX always generates a more or less delay.
 125 *
 126 * If all used features can be realized in hardware, and if transmit and/or
 127 * receive data ist disabled, the card may not send/receive any data at all.
 128 * Not receiving is useful if only announcements are played. Not sending is
 129 * useful if an answering machine records audio. Not sending and receiving is
 130 * useful during most states of the call. If supported by hardware, tones
 131 * will be played without cpu load. Small PBXs and NT-Mode applications will
 132 * not need expensive hardware when processing calls.
 133 *
 134 *
 135 * LOCKING:
 136 *
 137 * When data is received from upper or lower layer (card), the complete dsp
 138 * module is locked by a global lock.  This lock MUST lock irq, because it
 139 * must lock timer events by DSP poll timer.
 140 * When data is ready to be transmitted down, the data is queued and sent
 141 * outside lock and timer event.
 142 * PH_CONTROL must not change any settings, join or split conference members
 143 * during process of data.
 144 *
 145 * HDLC:
 146 *
 147 * It works quite the same as transparent, except that HDLC data is forwarded
 148 * to all other conference members if no hardware bridging is possible.
 149 * Send data will be writte to sendq. Sendq will be sent if confirm is received.
 150 * Conference cannot join, if one member is not hdlc.
 151 *
 152 */
 153
 154#include <linux/delay.h>
 155#include <linux/gfp.h>
 156#include <linux/mISDNif.h>
 157#include <linux/mISDNdsp.h>
 158#include <linux/module.h>
 159#include <linux/vmalloc.h>
 160#include "core.h"
 161#include "dsp.h"
 162
 163static const char *mISDN_dsp_revision = "2.0";
 164
 165static int debug;
 166static int options;
 167static int poll;
 168static int dtmfthreshold = 100;
 169
 170MODULE_AUTHOR("Andreas Eversberg");
 171module_param(debug, uint, S_IRUGO | S_IWUSR);
 172module_param(options, uint, S_IRUGO | S_IWUSR);
 173module_param(poll, uint, S_IRUGO | S_IWUSR);
 174module_param(dtmfthreshold, uint, S_IRUGO | S_IWUSR);
 175MODULE_LICENSE("GPL");
 176
 177/*int spinnest = 0;*/
 178
 179DEFINE_SPINLOCK(dsp_lock); /* global dsp lock */
 180LIST_HEAD(dsp_ilist);
 181LIST_HEAD(conf_ilist);
 182int dsp_debug;
 183int dsp_options;
 184int dsp_poll, dsp_tics;
 185
 186/* check if rx may be turned off or must be turned on */
 187static void
 188dsp_rx_off_member(struct dsp *dsp)
 189{
 190	struct mISDN_ctrl_req	cq;
 191	int rx_off = 1;
 192
 193	memset(&cq, 0, sizeof(cq));
 194
 195	if (!dsp->features_rx_off)
 196		return;
 197
 198	/* not disabled */
 199	if (!dsp->rx_disabled)
 200		rx_off = 0;
 201	/* software dtmf */
 202	else if (dsp->dtmf.software)
 203		rx_off = 0;
 204	/* echo in software */
 205	else if (dsp->echo.software)
 206		rx_off = 0;
 207	/* bridge in software */
 208	else if (dsp->conf && dsp->conf->software)
 209		rx_off = 0;
 210	/* data is not required by user space and not required
 211	 * for echo dtmf detection, soft-echo, soft-bridging */
 212
 213	if (rx_off == dsp->rx_is_off)
 214		return;
 215
 216	if (!dsp->ch.peer) {
 217		if (dsp_debug & DEBUG_DSP_CORE)
 218			printk(KERN_DEBUG "%s: no peer, no rx_off\n",
 219			       __func__);
 220		return;
 221	}
 222	cq.op = MISDN_CTRL_RX_OFF;
 223	cq.p1 = rx_off;
 224	if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
 225		printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
 226		       __func__);
 227		return;
 228	}
 229	dsp->rx_is_off = rx_off;
 230	if (dsp_debug & DEBUG_DSP_CORE)
 231		printk(KERN_DEBUG "%s: %s set rx_off = %d\n",
 232		       __func__, dsp->name, rx_off);
 233}
 234static void
 235dsp_rx_off(struct dsp *dsp)
 236{
 237	struct dsp_conf_member	*member;
 238
 239	if (dsp_options & DSP_OPT_NOHARDWARE)
 240		return;
 241
 242	/* no conf */
 243	if (!dsp->conf) {
 244		dsp_rx_off_member(dsp);
 245		return;
 246	}
 247	/* check all members in conf */
 248	list_for_each_entry(member, &dsp->conf->mlist, list) {
 249		dsp_rx_off_member(member->dsp);
 250	}
 251}
 252
 253/* enable "fill empty" feature */
 254static void
 255dsp_fill_empty(struct dsp *dsp)
 256{
 257	struct mISDN_ctrl_req	cq;
 258
 259	memset(&cq, 0, sizeof(cq));
 260
 261	if (!dsp->ch.peer) {
 262		if (dsp_debug & DEBUG_DSP_CORE)
 263			printk(KERN_DEBUG "%s: no peer, no fill_empty\n",
 264			       __func__);
 265		return;
 266	}
 267	cq.op = MISDN_CTRL_FILL_EMPTY;
 268	cq.p1 = 1;
 269	cq.p2 = dsp_silence;
 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
 280static int
 281dsp_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		return -EINVAL;
 292	}
 293	cont = *((int *)skb->data);
 294	len = skb->len - sizeof(int);
 295	data = skb->data + sizeof(int);
 296
 297	switch (cont) {
 298	case DTMF_TONE_START: /* turn on DTMF */
 299		if (dsp->hdlc) {
 300			ret = -EINVAL;
 301			break;
 302		}
 303		if (dsp_debug & DEBUG_DSP_CORE)
 304			printk(KERN_DEBUG "%s: start dtmf\n", __func__);
 305		if (len == sizeof(int)) {
 306			if (dsp_debug & DEBUG_DSP_CORE)
 307				printk(KERN_NOTICE "changing DTMF Threshold "
 308				       "to %d\n", *((int *)data));
 309			dsp->dtmf.treshold = (*(int *)data) * 10000;
 310		}
 311		dsp->dtmf.enable = 1;
 312		/* init goertzel */
 313		dsp_dtmf_goertzel_init(dsp);
 314
 315		/* check dtmf hardware */
 316		dsp_dtmf_hardware(dsp);
 317		dsp_rx_off(dsp);
 318		break;
 319	case DTMF_TONE_STOP: /* turn off DTMF */
 320		if (dsp_debug & DEBUG_DSP_CORE)
 321			printk(KERN_DEBUG "%s: stop dtmf\n", __func__);
 322		dsp->dtmf.enable = 0;
 323		dsp->dtmf.hardware = 0;
 324		dsp->dtmf.software = 0;
 325		break;
 326	case DSP_CONF_JOIN: /* join / update conference */
 327		if (len < sizeof(int)) {
 328			ret = -EINVAL;
 329			break;
 330		}
 331		if (*((u32 *)data) == 0)
 332			goto conf_split;
 333		if (dsp_debug & DEBUG_DSP_CORE)
 334			printk(KERN_DEBUG "%s: join conference %d\n",
 335			       __func__, *((u32 *)data));
 336		ret = dsp_cmx_conf(dsp, *((u32 *)data));
 337		/* dsp_cmx_hardware will also be called here */
 338		dsp_rx_off(dsp);
 339		if (dsp_debug & DEBUG_DSP_CMX)
 340			dsp_cmx_debug(dsp);
 341		break;
 342	case DSP_CONF_SPLIT: /* remove from conference */
 343	conf_split:
 344		if (dsp_debug & DEBUG_DSP_CORE)
 345			printk(KERN_DEBUG "%s: release conference\n", __func__);
 346		ret = dsp_cmx_conf(dsp, 0);
 347		/* dsp_cmx_hardware will also be called here */
 348		if (dsp_debug & DEBUG_DSP_CMX)
 349			dsp_cmx_debug(dsp);
 350		dsp_rx_off(dsp);
 351		break;
 352	case DSP_TONE_PATT_ON: /* play tone */
 353		if (dsp->hdlc) {
 354			ret = -EINVAL;
 355			break;
 356		}
 357		if (len < sizeof(int)) {
 358			ret = -EINVAL;
 359			break;
 360		}
 361		if (dsp_debug & DEBUG_DSP_CORE)
 362			printk(KERN_DEBUG "%s: turn tone 0x%x on\n",
 363			       __func__, *((int *)skb->data));
 364		ret = dsp_tone(dsp, *((int *)data));
 365		if (!ret) {
 366			dsp_cmx_hardware(dsp->conf, dsp);
 367			dsp_rx_off(dsp);
 368		}
 369		if (!dsp->tone.tone)
 370			goto tone_off;
 371		break;
 372	case DSP_TONE_PATT_OFF: /* stop tone */
 373		if (dsp->hdlc) {
 374			ret = -EINVAL;
 375			break;
 376		}
 377		if (dsp_debug & DEBUG_DSP_CORE)
 378			printk(KERN_DEBUG "%s: turn tone off\n", __func__);
 379		dsp_tone(dsp, 0);
 380		dsp_cmx_hardware(dsp->conf, dsp);
 381		dsp_rx_off(dsp);
 382		/* reset tx buffers (user space data) */
 383	tone_off:
 384		dsp->rx_W = 0;
 385		dsp->rx_R = 0;
 386		break;
 387	case DSP_VOL_CHANGE_TX: /* change volume */
 388		if (dsp->hdlc) {
 389			ret = -EINVAL;
 390			break;
 391		}
 392		if (len < sizeof(int)) {
 393			ret = -EINVAL;
 394			break;
 395		}
 396		dsp->tx_volume = *((int *)data);
 397		if (dsp_debug & DEBUG_DSP_CORE)
 398			printk(KERN_DEBUG "%s: change tx vol to %d\n",
 399			       __func__, dsp->tx_volume);
 400		dsp_cmx_hardware(dsp->conf, dsp);
 401		dsp_dtmf_hardware(dsp);
 402		dsp_rx_off(dsp);
 403		break;
 404	case DSP_VOL_CHANGE_RX: /* change volume */
 405		if (dsp->hdlc) {
 406			ret = -EINVAL;
 407			break;
 408		}
 409		if (len < sizeof(int)) {
 410			ret = -EINVAL;
 411			break;
 412		}
 413		dsp->rx_volume = *((int *)data);
 414		if (dsp_debug & DEBUG_DSP_CORE)
 415			printk(KERN_DEBUG "%s: change rx vol to %d\n",
 416			       __func__, dsp->tx_volume);
 417		dsp_cmx_hardware(dsp->conf, dsp);
 418		dsp_dtmf_hardware(dsp);
 419		dsp_rx_off(dsp);
 420		break;
 421	case DSP_ECHO_ON: /* enable echo */
 422		dsp->echo.software = 1; /* soft echo */
 423		if (dsp_debug & DEBUG_DSP_CORE)
 424			printk(KERN_DEBUG "%s: enable cmx-echo\n", __func__);
 425		dsp_cmx_hardware(dsp->conf, dsp);
 426		dsp_rx_off(dsp);
 427		if (dsp_debug & DEBUG_DSP_CMX)
 428			dsp_cmx_debug(dsp);
 429		break;
 430	case DSP_ECHO_OFF: /* disable echo */
 431		dsp->echo.software = 0;
 432		dsp->echo.hardware = 0;
 433		if (dsp_debug & DEBUG_DSP_CORE)
 434			printk(KERN_DEBUG "%s: disable cmx-echo\n", __func__);
 435		dsp_cmx_hardware(dsp->conf, dsp);
 436		dsp_rx_off(dsp);
 437		if (dsp_debug & DEBUG_DSP_CMX)
 438			dsp_cmx_debug(dsp);
 439		break;
 440	case DSP_RECEIVE_ON: /* enable receive to user space */
 441		if (dsp_debug & DEBUG_DSP_CORE)
 442			printk(KERN_DEBUG "%s: enable receive to user "
 443			       "space\n", __func__);
 444		dsp->rx_disabled = 0;
 445		dsp_rx_off(dsp);
 446		break;
 447	case DSP_RECEIVE_OFF: /* disable receive to user space */
 448		if (dsp_debug & DEBUG_DSP_CORE)
 449			printk(KERN_DEBUG "%s: disable receive to "
 450			       "user space\n", __func__);
 451		dsp->rx_disabled = 1;
 452		dsp_rx_off(dsp);
 453		break;
 454	case DSP_MIX_ON: /* enable mixing of tx data */
 455		if (dsp->hdlc) {
 456			ret = -EINVAL;
 457			break;
 458		}
 459		if (dsp_debug & DEBUG_DSP_CORE)
 460			printk(KERN_DEBUG "%s: enable mixing of "
 461			       "tx-data with conf members\n", __func__);
 462		dsp->tx_mix = 1;
 463		dsp_cmx_hardware(dsp->conf, dsp);
 464		dsp_rx_off(dsp);
 465		if (dsp_debug & DEBUG_DSP_CMX)
 466			dsp_cmx_debug(dsp);
 467		break;
 468	case DSP_MIX_OFF: /* disable mixing of tx data */
 469		if (dsp->hdlc) {
 470			ret = -EINVAL;
 471			break;
 472		}
 473		if (dsp_debug & DEBUG_DSP_CORE)
 474			printk(KERN_DEBUG "%s: disable mixing of "
 475			       "tx-data with conf members\n", __func__);
 476		dsp->tx_mix = 0;
 477		dsp_cmx_hardware(dsp->conf, dsp);
 478		dsp_rx_off(dsp);
 479		if (dsp_debug & DEBUG_DSP_CMX)
 480			dsp_cmx_debug(dsp);
 481		break;
 482	case DSP_TXDATA_ON: /* enable txdata */
 483		dsp->tx_data = 1;
 484		if (dsp_debug & DEBUG_DSP_CORE)
 485			printk(KERN_DEBUG "%s: enable tx-data\n", __func__);
 486		dsp_cmx_hardware(dsp->conf, dsp);
 487		dsp_rx_off(dsp);
 488		if (dsp_debug & DEBUG_DSP_CMX)
 489			dsp_cmx_debug(dsp);
 490		break;
 491	case DSP_TXDATA_OFF: /* disable txdata */
 492		dsp->tx_data = 0;
 493		if (dsp_debug & DEBUG_DSP_CORE)
 494			printk(KERN_DEBUG "%s: disable tx-data\n", __func__);
 495		dsp_cmx_hardware(dsp->conf, dsp);
 496		dsp_rx_off(dsp);
 497		if (dsp_debug & DEBUG_DSP_CMX)
 498			dsp_cmx_debug(dsp);
 499		break;
 500	case DSP_DELAY: /* use delay algorithm instead of dynamic
 501			   jitter algorithm */
 502		if (dsp->hdlc) {
 503			ret = -EINVAL;
 504			break;
 505		}
 506		if (len < sizeof(int)) {
 507			ret = -EINVAL;
 508			break;
 509		}
 510		dsp->cmx_delay = (*((int *)data)) << 3;
 511		/* milliseconds to samples */
 512		if (dsp->cmx_delay >= (CMX_BUFF_HALF >> 1))
 513			/* clip to half of maximum usable buffer
 514			   (half of half buffer) */
 515			dsp->cmx_delay = (CMX_BUFF_HALF >> 1) - 1;
 516		if (dsp_debug & DEBUG_DSP_CORE)
 517			printk(KERN_DEBUG "%s: use delay algorithm to "
 518			       "compensate jitter (%d samples)\n",
 519			       __func__, dsp->cmx_delay);
 520		break;
 521	case DSP_JITTER: /* use dynamic jitter algorithm instead of
 522			    delay algorithm */
 523		if (dsp->hdlc) {
 524			ret = -EINVAL;
 525			break;
 526		}
 527		dsp->cmx_delay = 0;
 528		if (dsp_debug & DEBUG_DSP_CORE)
 529			printk(KERN_DEBUG "%s: use jitter algorithm to "
 530			       "compensate jitter\n", __func__);
 531		break;
 532	case DSP_TX_DEJITTER: /* use dynamic jitter algorithm for tx-buffer */
 533		if (dsp->hdlc) {
 534			ret = -EINVAL;
 535			break;
 536		}
 537		dsp->tx_dejitter = 1;
 538		if (dsp_debug & DEBUG_DSP_CORE)
 539			printk(KERN_DEBUG "%s: use dejitter on TX "
 540			       "buffer\n", __func__);
 541		break;
 542	case DSP_TX_DEJ_OFF: /* use tx-buffer without dejittering*/
 543		if (dsp->hdlc) {
 544			ret = -EINVAL;
 545			break;
 546		}
 547		dsp->tx_dejitter = 0;
 548		if (dsp_debug & DEBUG_DSP_CORE)
 549			printk(KERN_DEBUG "%s: use TX buffer without "
 550			       "dejittering\n", __func__);
 551		break;
 552	case DSP_PIPELINE_CFG:
 553		if (dsp->hdlc) {
 554			ret = -EINVAL;
 555			break;
 556		}
 557		if (len > 0 && ((char *)data)[len - 1]) {
 558			printk(KERN_DEBUG "%s: pipeline config string "
 559			       "is not NULL terminated!\n", __func__);
 560			ret = -EINVAL;
 561		} else {
 562			dsp->pipeline.inuse = 1;
 563			dsp_cmx_hardware(dsp->conf, dsp);
 564			ret = dsp_pipeline_build(&dsp->pipeline,
 565						 len > 0 ? data : NULL);
 566			dsp_cmx_hardware(dsp->conf, dsp);
 567			dsp_rx_off(dsp);
 568		}
 569		break;
 570	case DSP_BF_ENABLE_KEY: /* turn blowfish on */
 571		if (dsp->hdlc) {
 572			ret = -EINVAL;
 573			break;
 574		}
 575		if (len < 4 || len > 56) {
 576			ret = -EINVAL;
 577			break;
 578		}
 579		if (dsp_debug & DEBUG_DSP_CORE)
 580			printk(KERN_DEBUG "%s: turn blowfish on (key "
 581			       "not shown)\n", __func__);
 582		ret = dsp_bf_init(dsp, (u8 *)data, len);
 583		/* set new cont */
 584		if (!ret)
 585			cont = DSP_BF_ACCEPT;
 586		else
 587			cont = DSP_BF_REJECT;
 588		/* send indication if it worked to set it */
 589		nskb = _alloc_mISDN_skb(PH_CONTROL_IND, MISDN_ID_ANY,
 590					sizeof(int), &cont, GFP_ATOMIC);
 591		if (nskb) {
 592			if (dsp->up) {
 593				if (dsp->up->send(dsp->up, nskb))
 594					dev_kfree_skb(nskb);
 595			} else
 596				dev_kfree_skb(nskb);
 597		}
 598		if (!ret) {
 599			dsp_cmx_hardware(dsp->conf, dsp);
 600			dsp_dtmf_hardware(dsp);
 601			dsp_rx_off(dsp);
 602		}
 603		break;
 604	case DSP_BF_DISABLE: /* turn blowfish off */
 605		if (dsp->hdlc) {
 606			ret = -EINVAL;
 607			break;
 608		}
 609		if (dsp_debug & DEBUG_DSP_CORE)
 610			printk(KERN_DEBUG "%s: turn blowfish off\n", __func__);
 611		dsp_bf_cleanup(dsp);
 612		dsp_cmx_hardware(dsp->conf, dsp);
 613		dsp_dtmf_hardware(dsp);
 614		dsp_rx_off(dsp);
 615		break;
 616	default:
 617		if (dsp_debug & DEBUG_DSP_CORE)
 618			printk(KERN_DEBUG "%s: ctrl req %x unhandled\n",
 619			       __func__, cont);
 620		ret = -EINVAL;
 621	}
 622	return ret;
 623}
 624
 625static void
 626get_features(struct mISDNchannel *ch)
 627{
 628	struct dsp		*dsp = container_of(ch, struct dsp, ch);
 629	struct mISDN_ctrl_req	cq;
 630
 631	if (!ch->peer) {
 632		if (dsp_debug & DEBUG_DSP_CORE)
 633			printk(KERN_DEBUG "%s: no peer, no features\n",
 634			       __func__);
 635		return;
 636	}
 637	memset(&cq, 0, sizeof(cq));
 638	cq.op = MISDN_CTRL_GETOP;
 639	if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq) < 0) {
 640		printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
 641		       __func__);
 642		return;
 643	}
 644	if (cq.op & MISDN_CTRL_RX_OFF)
 645		dsp->features_rx_off = 1;
 646	if (cq.op & MISDN_CTRL_FILL_EMPTY)
 647		dsp->features_fill_empty = 1;
 648	if (dsp_options & DSP_OPT_NOHARDWARE)
 649		return;
 650	if ((cq.op & MISDN_CTRL_HW_FEATURES_OP)) {
 651		cq.op = MISDN_CTRL_HW_FEATURES;
 652		*((u_long *)&cq.p1) = (u_long)&dsp->features;
 653		if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq)) {
 654			printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
 655			       __func__);
 656		}
 657	} else
 658		if (dsp_debug & DEBUG_DSP_CORE)
 659			printk(KERN_DEBUG "%s: features not supported for %s\n",
 660			       __func__, dsp->name);
 661}
 662
 663static int
 664dsp_function(struct mISDNchannel *ch,  struct sk_buff *skb)
 665{
 666	struct dsp		*dsp = container_of(ch, struct dsp, ch);
 667	struct mISDNhead	*hh;
 668	int			ret = 0;
 669	u8			*digits = NULL;
 670	u_long			flags;
 671
 672	hh = mISDN_HEAD_P(skb);
 673	switch (hh->prim) {
 674		/* FROM DOWN */
 675	case (PH_DATA_CNF):
 676		dsp->data_pending = 0;
 677		/* trigger next hdlc frame, if any */
 678		if (dsp->hdlc) {
 679			spin_lock_irqsave(&dsp_lock, flags);
 680			if (dsp->b_active)
 681				schedule_work(&dsp->workq);
 682			spin_unlock_irqrestore(&dsp_lock, flags);
 683		}
 684		break;
 685	case (PH_DATA_IND):
 686	case (DL_DATA_IND):
 687		if (skb->len < 1) {
 688			ret = -EINVAL;
 689			break;
 690		}
 691		if (dsp->rx_is_off) {
 692			if (dsp_debug & DEBUG_DSP_CORE)
 693				printk(KERN_DEBUG "%s: rx-data during rx_off"
 694				       " for %s\n",
 695				       __func__, dsp->name);
 696		}
 697		if (dsp->hdlc) {
 698			/* hdlc */
 699			spin_lock_irqsave(&dsp_lock, flags);
 700			dsp_cmx_hdlc(dsp, skb);
 701			spin_unlock_irqrestore(&dsp_lock, flags);
 702			if (dsp->rx_disabled) {
 703				/* if receive is not allowed */
 704				break;
 705			}
 706			hh->prim = DL_DATA_IND;
 707			if (dsp->up)
 708				return dsp->up->send(dsp->up, skb);
 709			break;
 710		}
 711
 712		spin_lock_irqsave(&dsp_lock, flags);
 713
 714		/* decrypt if enabled */
 715		if (dsp->bf_enable)
 716			dsp_bf_decrypt(dsp, skb->data, skb->len);
 717		/* pipeline */
 718		if (dsp->pipeline.inuse)
 719			dsp_pipeline_process_rx(&dsp->pipeline, skb->data,
 720						skb->len, hh->id);
 721		/* change volume if requested */
 722		if (dsp->rx_volume)
 723			dsp_change_volume(skb, dsp->rx_volume);
 724		/* check if dtmf soft decoding is turned on */
 725		if (dsp->dtmf.software) {
 726			digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
 727							  skb->len, (dsp_options & DSP_OPT_ULAW) ? 1 : 0);
 728		}
 729		/* we need to process receive data if software */
 730		if (dsp->conf && dsp->conf->software) {
 731			/* process data from card at cmx */
 732			dsp_cmx_receive(dsp, skb);
 733		}
 734
 735		spin_unlock_irqrestore(&dsp_lock, flags);
 736
 737		/* send dtmf result, if any */
 738		if (digits) {
 739			while (*digits) {
 740				int k;
 741				struct sk_buff *nskb;
 742				if (dsp_debug & DEBUG_DSP_DTMF)
 743					printk(KERN_DEBUG "%s: digit"
 744					       "(%c) to layer %s\n",
 745					       __func__, *digits, dsp->name);
 746				k = *digits | DTMF_TONE_VAL;
 747				nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
 748							MISDN_ID_ANY, sizeof(int), &k,
 749							GFP_ATOMIC);
 750				if (nskb) {
 751					if (dsp->up) {
 752						if (dsp->up->send(
 753							    dsp->up, nskb))
 754							dev_kfree_skb(nskb);
 755					} else
 756						dev_kfree_skb(nskb);
 757				}
 758				digits++;
 759			}
 760		}
 761		if (dsp->rx_disabled) {
 762			/* if receive is not allowed */
 763			break;
 764		}
 765		hh->prim = DL_DATA_IND;
 766		if (dsp->up)
 767			return dsp->up->send(dsp->up, skb);
 768		break;
 769	case (PH_CONTROL_IND):
 770		if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
 771			printk(KERN_DEBUG "%s: PH_CONTROL INDICATION "
 772			       "received: %x (len %d) %s\n", __func__,
 773			       hh->id, skb->len, dsp->name);
 774		switch (hh->id) {
 775		case (DTMF_HFC_COEF): /* getting coefficients */
 776			if (!dsp->dtmf.hardware) {
 777				if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
 778					printk(KERN_DEBUG "%s: ignoring DTMF "
 779					       "coefficients from HFC\n",
 780					       __func__);
 781				break;
 782			}
 783			digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
 784							  skb->len, 2);
 785			while (*digits) {
 786				int k;
 787				struct sk_buff *nskb;
 788				if (dsp_debug & DEBUG_DSP_DTMF)
 789					printk(KERN_DEBUG "%s: digit"
 790					       "(%c) to layer %s\n",
 791					       __func__, *digits, dsp->name);
 792				k = *digits | DTMF_TONE_VAL;
 793				nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
 794							MISDN_ID_ANY, sizeof(int), &k,
 795							GFP_ATOMIC);
 796				if (nskb) {
 797					if (dsp->up) {
 798						if (dsp->up->send(
 799							    dsp->up, nskb))
 800							dev_kfree_skb(nskb);
 801					} else
 802						dev_kfree_skb(nskb);
 803				}
 804				digits++;
 805			}
 806			break;
 807		case (HFC_VOL_CHANGE_TX): /* change volume */
 808			if (skb->len != sizeof(int)) {
 809				ret = -EINVAL;
 810				break;
 811			}
 812			spin_lock_irqsave(&dsp_lock, flags);
 813			dsp->tx_volume = *((int *)skb->data);
 814			if (dsp_debug & DEBUG_DSP_CORE)
 815				printk(KERN_DEBUG "%s: change tx volume to "
 816				       "%d\n", __func__, dsp->tx_volume);
 817			dsp_cmx_hardware(dsp->conf, dsp);
 818			dsp_dtmf_hardware(dsp);
 819			dsp_rx_off(dsp);
 820			spin_unlock_irqrestore(&dsp_lock, flags);
 821			break;
 822		default:
 823			if (dsp_debug & DEBUG_DSP_CORE)
 824				printk(KERN_DEBUG "%s: ctrl ind %x unhandled "
 825				       "%s\n", __func__, hh->id, dsp->name);
 826			ret = -EINVAL;
 827		}
 828		break;
 829	case (PH_ACTIVATE_IND):
 830	case (PH_ACTIVATE_CNF):
 831		if (dsp_debug & DEBUG_DSP_CORE)
 832			printk(KERN_DEBUG "%s: b_channel is now active %s\n",
 833			       __func__, dsp->name);
 834		/* bchannel now active */
 835		spin_lock_irqsave(&dsp_lock, flags);
 836		dsp->b_active = 1;
 837		dsp->data_pending = 0;
 838		dsp->rx_init = 1;
 839		/* rx_W and rx_R will be adjusted on first frame */
 840		dsp->rx_W = 0;
 841		dsp->rx_R = 0;
 842		memset(dsp->rx_buff, 0, sizeof(dsp->rx_buff));
 843		dsp_cmx_hardware(dsp->conf, dsp);
 844		dsp_dtmf_hardware(dsp);
 845		dsp_rx_off(dsp);
 846		spin_unlock_irqrestore(&dsp_lock, flags);
 847		if (dsp_debug & DEBUG_DSP_CORE)
 848			printk(KERN_DEBUG "%s: done with activation, sending "
 849			       "confirm to user space. %s\n", __func__,
 850			       dsp->name);
 851		/* send activation to upper layer */
 852		hh->prim = DL_ESTABLISH_CNF;
 853		if (dsp->up)
 854			return dsp->up->send(dsp->up, skb);
 855		break;
 856	case (PH_DEACTIVATE_IND):
 857	case (PH_DEACTIVATE_CNF):
 858		if (dsp_debug & DEBUG_DSP_CORE)
 859			printk(KERN_DEBUG "%s: b_channel is now inactive %s\n",
 860			       __func__, dsp->name);
 861		/* bchannel now inactive */
 862		spin_lock_irqsave(&dsp_lock, flags);
 863		dsp->b_active = 0;
 864		dsp->data_pending = 0;
 865		dsp_cmx_hardware(dsp->conf, dsp);
 866		dsp_rx_off(dsp);
 867		spin_unlock_irqrestore(&dsp_lock, flags);
 868		hh->prim = DL_RELEASE_CNF;
 869		if (dsp->up)
 870			return dsp->up->send(dsp->up, skb);
 871		break;
 872		/* FROM UP */
 873	case (DL_DATA_REQ):
 874	case (PH_DATA_REQ):
 875		if (skb->len < 1) {
 876			ret = -EINVAL;
 877			break;
 878		}
 879		if (dsp->hdlc) {
 880			/* hdlc */
 881			if (!dsp->b_active) {
 882				ret = -EIO;
 883				break;
 884			}
 885			hh->prim = PH_DATA_REQ;
 886			spin_lock_irqsave(&dsp_lock, flags);
 887			skb_queue_tail(&dsp->sendq, skb);
 888			schedule_work(&dsp->workq);
 889			spin_unlock_irqrestore(&dsp_lock, flags);
 890			return 0;
 891		}
 892		/* send data to tx-buffer (if no tone is played) */
 893		if (!dsp->tone.tone) {
 894			spin_lock_irqsave(&dsp_lock, flags);
 895			dsp_cmx_transmit(dsp, skb);
 896			spin_unlock_irqrestore(&dsp_lock, flags);
 897		}
 898		break;
 899	case (PH_CONTROL_REQ):
 900		spin_lock_irqsave(&dsp_lock, flags);
 901		ret = dsp_control_req(dsp, hh, skb);
 902		spin_unlock_irqrestore(&dsp_lock, flags);
 903		break;
 904	case (DL_ESTABLISH_REQ):
 905	case (PH_ACTIVATE_REQ):
 906		if (dsp_debug & DEBUG_DSP_CORE)
 907			printk(KERN_DEBUG "%s: activating b_channel %s\n",
 908			       __func__, dsp->name);
 909		if (dsp->dtmf.hardware || dsp->dtmf.software)
 910			dsp_dtmf_goertzel_init(dsp);
 911		get_features(ch);
 912		/* enable fill_empty feature */
 913		if (dsp->features_fill_empty)
 914			dsp_fill_empty(dsp);
 915		/* send ph_activate */
 916		hh->prim = PH_ACTIVATE_REQ;
 917		if (ch->peer)
 918			return ch->recv(ch->peer, skb);
 919		break;
 920	case (DL_RELEASE_REQ):
 921	case (PH_DEACTIVATE_REQ):
 922		if (dsp_debug & DEBUG_DSP_CORE)
 923			printk(KERN_DEBUG "%s: releasing b_channel %s\n",
 924			       __func__, dsp->name);
 925		spin_lock_irqsave(&dsp_lock, flags);
 926		dsp->tone.tone = 0;
 927		dsp->tone.hardware = 0;
 928		dsp->tone.software = 0;
 929		if (timer_pending(&dsp->tone.tl))
 930			del_timer(&dsp->tone.tl);
 931		if (dsp->conf)
 932			dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be
 933						 called here */
 934		skb_queue_purge(&dsp->sendq);
 935		spin_unlock_irqrestore(&dsp_lock, flags);
 936		hh->prim = PH_DEACTIVATE_REQ;
 937		if (ch->peer)
 938			return ch->recv(ch->peer, skb);
 939		break;
 940	default:
 941		if (dsp_debug & DEBUG_DSP_CORE)
 942			printk(KERN_DEBUG "%s: msg %x unhandled %s\n",
 943			       __func__, hh->prim, dsp->name);
 944		ret = -EINVAL;
 945	}
 946	if (!ret)
 947		dev_kfree_skb(skb);
 948	return ret;
 949}
 950
 951static int
 952dsp_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
 953{
 954	struct dsp		*dsp = container_of(ch, struct dsp, ch);
 955	u_long		flags;
 
 956
 957	if (debug & DEBUG_DSP_CTRL)
 958		printk(KERN_DEBUG "%s:(%x)\n", __func__, cmd);
 959
 960	switch (cmd) {
 961	case OPEN_CHANNEL:
 962		break;
 963	case CLOSE_CHANNEL:
 964		if (dsp->ch.peer)
 965			dsp->ch.peer->ctrl(dsp->ch.peer, CLOSE_CHANNEL, NULL);
 966
 967		/* wait until workqueue has finished,
 968		 * must lock here, or we may hit send-process currently
 969		 * queueing. */
 970		spin_lock_irqsave(&dsp_lock, flags);
 971		dsp->b_active = 0;
 972		spin_unlock_irqrestore(&dsp_lock, flags);
 973		/* MUST not be locked, because it waits until queue is done. */
 974		cancel_work_sync(&dsp->workq);
 975		spin_lock_irqsave(&dsp_lock, flags);
 976		if (timer_pending(&dsp->tone.tl))
 977			del_timer(&dsp->tone.tl);
 978		skb_queue_purge(&dsp->sendq);
 979		if (dsp_debug & DEBUG_DSP_CTRL)
 980			printk(KERN_DEBUG "%s: releasing member %s\n",
 981			       __func__, dsp->name);
 982		dsp->b_active = 0;
 983		dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be called
 984					 here */
 985		dsp_pipeline_destroy(&dsp->pipeline);
 986
 987		if (dsp_debug & DEBUG_DSP_CTRL)
 988			printk(KERN_DEBUG "%s: remove & destroy object %s\n",
 989			       __func__, dsp->name);
 990		list_del(&dsp->list);
 991		spin_unlock_irqrestore(&dsp_lock, flags);
 992
 993		if (dsp_debug & DEBUG_DSP_CTRL)
 994			printk(KERN_DEBUG "%s: dsp instance released\n",
 995			       __func__);
 996		vfree(dsp);
 997		module_put(THIS_MODULE);
 998		break;
 999	}
1000	return 0;
1001}
1002
1003static void
1004dsp_send_bh(struct work_struct *work)
1005{
1006	struct dsp *dsp = container_of(work, struct dsp, workq);
1007	struct sk_buff *skb;
1008	struct mISDNhead	*hh;
1009
1010	if (dsp->hdlc && dsp->data_pending)
1011		return; /* wait until data has been acknowledged */
1012
1013	/* send queued data */
1014	while ((skb = skb_dequeue(&dsp->sendq))) {
1015		/* in locked date, we must have still data in queue */
1016		if (dsp->data_pending) {
1017			if (dsp_debug & DEBUG_DSP_CORE)
1018				printk(KERN_DEBUG "%s: fifo full %s, this is "
1019				       "no bug!\n", __func__, dsp->name);
1020			/* flush transparent data, if not acked */
1021			dev_kfree_skb(skb);
1022			continue;
1023		}
1024		hh = mISDN_HEAD_P(skb);
1025		if (hh->prim == DL_DATA_REQ) {
1026			/* send packet up */
1027			if (dsp->up) {
1028				if (dsp->up->send(dsp->up, skb))
1029					dev_kfree_skb(skb);
1030			} else
1031				dev_kfree_skb(skb);
1032		} else {
1033			/* send packet down */
1034			if (dsp->ch.peer) {
1035				dsp->data_pending = 1;
1036				if (dsp->ch.recv(dsp->ch.peer, skb)) {
1037					dev_kfree_skb(skb);
1038					dsp->data_pending = 0;
1039				}
1040			} else
1041				dev_kfree_skb(skb);
1042		}
1043	}
1044}
1045
1046static int
1047dspcreate(struct channel_req *crq)
1048{
1049	struct dsp		*ndsp;
1050	u_long		flags;
1051
1052	if (crq->protocol != ISDN_P_B_L2DSP
1053	    && crq->protocol != ISDN_P_B_L2DSPHDLC)
1054		return -EPROTONOSUPPORT;
1055	ndsp = vzalloc(sizeof(struct dsp));
1056	if (!ndsp) {
1057		printk(KERN_ERR "%s: vmalloc struct dsp failed\n", __func__);
1058		return -ENOMEM;
1059	}
1060	if (dsp_debug & DEBUG_DSP_CTRL)
1061		printk(KERN_DEBUG "%s: creating new dsp instance\n", __func__);
1062
1063	/* default enabled */
1064	INIT_WORK(&ndsp->workq, (void *)dsp_send_bh);
1065	skb_queue_head_init(&ndsp->sendq);
1066	ndsp->ch.send = dsp_function;
1067	ndsp->ch.ctrl = dsp_ctrl;
1068	ndsp->up = crq->ch;
1069	crq->ch = &ndsp->ch;
1070	if (crq->protocol == ISDN_P_B_L2DSP) {
1071		crq->protocol = ISDN_P_B_RAW;
1072		ndsp->hdlc = 0;
1073	} else {
1074		crq->protocol = ISDN_P_B_HDLC;
1075		ndsp->hdlc = 1;
1076	}
1077	if (!try_module_get(THIS_MODULE))
1078		printk(KERN_WARNING "%s:cannot get module\n",
1079		       __func__);
1080
1081	sprintf(ndsp->name, "DSP_C%x(0x%p)",
1082		ndsp->up->st->dev->id + 1, ndsp);
1083	/* set frame size to start */
1084	ndsp->features.hfc_id = -1; /* current PCM id */
1085	ndsp->features.pcm_id = -1; /* current PCM id */
1086	ndsp->pcm_slot_rx = -1; /* current CPM slot */
1087	ndsp->pcm_slot_tx = -1;
1088	ndsp->pcm_bank_rx = -1;
1089	ndsp->pcm_bank_tx = -1;
1090	ndsp->hfc_conf = -1; /* current conference number */
1091	/* set tone timer */
1092	timer_setup(&ndsp->tone.tl, dsp_tone_timeout, 0);
1093
1094	if (dtmfthreshold < 20 || dtmfthreshold > 500)
1095		dtmfthreshold = 200;
1096	ndsp->dtmf.treshold = dtmfthreshold * 10000;
1097
1098	/* init pipeline append to list */
1099	spin_lock_irqsave(&dsp_lock, flags);
1100	dsp_pipeline_init(&ndsp->pipeline);
1101	list_add_tail(&ndsp->list, &dsp_ilist);
1102	spin_unlock_irqrestore(&dsp_lock, flags);
1103
1104	return 0;
1105}
1106
1107
1108static struct Bprotocol DSP = {
1109	.Bprotocols = (1 << (ISDN_P_B_L2DSP & ISDN_P_B_MASK))
1110	| (1 << (ISDN_P_B_L2DSPHDLC & ISDN_P_B_MASK)),
1111	.name = "dsp",
1112	.create = dspcreate
1113};
1114
1115static int __init dsp_init(void)
1116{
1117	int err;
1118	int tics;
1119
1120	printk(KERN_INFO "DSP module %s\n", mISDN_dsp_revision);
1121
1122	dsp_options = options;
1123	dsp_debug = debug;
1124
1125	/* set packet size */
1126	dsp_poll = poll;
1127	if (dsp_poll) {
1128		if (dsp_poll > MAX_POLL) {
1129			printk(KERN_ERR "%s: Wrong poll value (%d), use %d "
1130			       "maximum.\n", __func__, poll, MAX_POLL);
1131			err = -EINVAL;
1132			return err;
1133		}
1134		if (dsp_poll < 8) {
1135			printk(KERN_ERR "%s: Wrong poll value (%d), use 8 "
1136			       "minimum.\n", __func__, dsp_poll);
1137			err = -EINVAL;
1138			return err;
1139		}
1140		dsp_tics = poll * HZ / 8000;
1141		if (dsp_tics * 8000 != poll * HZ) {
1142			printk(KERN_INFO "mISDN_dsp: Cannot clock every %d "
1143			       "samples (0,125 ms). It is not a multiple of "
1144			       "%d HZ.\n", poll, HZ);
1145			err = -EINVAL;
1146			return err;
1147		}
1148	} else {
1149		poll = 8;
1150		while (poll <= MAX_POLL) {
1151			tics = (poll * HZ) / 8000;
1152			if (tics * 8000 == poll * HZ) {
1153				dsp_tics = tics;
1154				dsp_poll = poll;
1155				if (poll >= 64)
1156					break;
1157			}
1158			poll++;
1159		}
1160	}
1161	if (dsp_poll == 0) {
1162		printk(KERN_INFO "mISDN_dsp: There is no multiple of kernel "
1163		       "clock that equals exactly the duration of 8-256 "
1164		       "samples. (Choose kernel clock speed like 100, 250, "
1165		       "300, 1000)\n");
1166		err = -EINVAL;
1167		return err;
1168	}
1169	printk(KERN_INFO "mISDN_dsp: DSP clocks every %d samples. This equals "
1170	       "%d jiffies.\n", dsp_poll, dsp_tics);
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) ?
1176		dsp_audio_ulaw_to_s32 : 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	timer_setup(&dsp_spl_tl, dsp_cmx_send, 0);
1199	dsp_spl_tl.expires = jiffies + dsp_tics;
1200	dsp_spl_jiffies = dsp_spl_tl.expires;
1201	add_timer(&dsp_spl_tl);
1202
1203	return 0;
1204}
1205
1206
1207static void __exit dsp_cleanup(void)
1208{
1209	mISDN_unregister_Bprotocol(&DSP);
1210
1211	del_timer_sync(&dsp_spl_tl);
1212
1213	if (!list_empty(&dsp_ilist)) {
1214		printk(KERN_ERR "mISDN_dsp: Audio DSP object inst list not "
1215		       "empty.\n");
1216	}
1217	if (!list_empty(&conf_ilist)) {
1218		printk(KERN_ERR "mISDN_dsp: Conference list not empty. Not "
1219		       "all memory freed.\n");
1220	}
1221
1222	dsp_pipeline_module_exit();
1223}
1224
1225module_init(dsp_init);
1226module_exit(dsp_cleanup);