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" 162 163 static const char *mISDN_dsp_revision = "2.0"; 164 165 static int debug; 166 static int options; 167 static int poll; 168 static int dtmfthreshold = 100; 169 170 MODULE_AUTHOR("Andreas Eversberg"); 171 module_param(debug, uint, S_IRUGO | S_IWUSR); 172 module_param(options, uint, S_IRUGO | S_IWUSR); 173 module_param(poll, uint, S_IRUGO | S_IWUSR); 174 module_param(dtmfthreshold, uint, S_IRUGO | S_IWUSR); 175 MODULE_LICENSE("GPL"); 176 177 /*int spinnest = 0;*/ 178 179 DEFINE_SPINLOCK(dsp_lock); /* global dsp lock */ 180 LIST_HEAD(dsp_ilist); 181 LIST_HEAD(conf_ilist); 182 int dsp_debug; 183 int dsp_options; 184 int dsp_poll, dsp_tics; 185 186 /* check if rx may be turned off or must be turned on */ 187 static void 188 dsp_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 } 234 static void 235 dsp_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 */ 254 static void 255 dsp_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 } 279 280 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 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 } 624 625 static void 626 get_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 } 662 663 static int 664 dsp_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 } 950 951 static int 952 dsp_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 1003 static void 1004 dsp_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 1046 static int 1047 dspcreate(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 1108 static 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 1115 static 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, (void *)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 1207 static 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 1225 module_init(dsp_init); 1226 module_exit(dsp_cleanup); 1227