FILE
dsp_core.c
File preview with syntax highlighting.
linux-6.19.14/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 * 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_DESCRIPTION("mISDN driver for Digital Audio Processing of transparent data"); 176MODULE_LICENSE("GPL"); 177 178/*int spinnest = 0;*/ 179 180DEFINE_SPINLOCK(dsp_lock); /* global dsp lock */ 181LIST_HEAD(dsp_ilist); 182LIST_HEAD(conf_ilist); 183int dsp_debug; 184int dsp_options; 185int dsp_poll, dsp_tics; 186 187/* check if rx may be turned off or must be turned on */ 188static void 189dsp_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.software) 207 rx_off = 0; 208 /* bridge in software */ 209 else if (dsp->conf && dsp->conf->software) 210 rx_off = 0; 211 /* data is not required by user space and not required 212 * for echo dtmf detection, soft-echo, soft-bridging */ 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} 235static void 236dsp_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 */ 255static void 256dsp_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 cq.p2 = dsp_silence; 271 if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) { 272 printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n", 273 __func__); 274 return; 275 } 276 if (dsp_debug & DEBUG_DSP_CORE) 277 printk(KERN_DEBUG "%s: %s set fill_empty = 1\n", 278 __func__, dsp->name); 279} 280 281static int 282dsp_control_req(struct dsp *dsp, struct mISDNhead *hh, struct sk_buff *skb) 283{ 284 struct sk_buff *nskb; 285 int ret = 0; 286 int cont; 287 u8 *data; 288 int len; 289 290 if (skb->len < sizeof(int)) { 291 printk(KERN_ERR "%s: PH_CONTROL message too short\n", __func__); 292 return -EINVAL; 293 } 294 cont = *((int *)skb->data); 295 len = skb->len - sizeof(int); 296 data = skb->data + sizeof(int); 297 298 switch (cont) { 299 case DTMF_TONE_START: /* turn on DTMF */ 300 if (dsp->hdlc) { 301 ret = -EINVAL; 302 break; 303 } 304 if (dsp_debug & DEBUG_DSP_CORE) 305 printk(KERN_DEBUG "%s: start dtmf\n", __func__); 306 if (len == sizeof(int)) { 307 if (dsp_debug & DEBUG_DSP_CORE) 308 printk(KERN_NOTICE "changing DTMF Threshold " 309 "to %d\n", *((int *)data)); 310 dsp->dtmf.treshold = (*(int *)data) * 10000; 311 } 312 dsp->dtmf.enable = 1; 313 /* init goertzel */ 314 dsp_dtmf_goertzel_init(dsp); 315 316 /* check dtmf hardware */ 317 dsp_dtmf_hardware(dsp); 318 dsp_rx_off(dsp); 319 break; 320 case DTMF_TONE_STOP: /* turn off DTMF */ 321 if (dsp_debug & DEBUG_DSP_CORE) 322 printk(KERN_DEBUG "%s: stop dtmf\n", __func__); 323 dsp->dtmf.enable = 0; 324 dsp->dtmf.hardware = 0; 325 dsp->dtmf.software = 0; 326 break; 327 case DSP_CONF_JOIN: /* join / update conference */ 328 if (len < sizeof(int)) { 329 ret = -EINVAL; 330 break; 331 } 332 if (*((u32 *)data) == 0) 333 goto conf_split; 334 if (dsp_debug & DEBUG_DSP_CORE) 335 printk(KERN_DEBUG "%s: join conference %d\n", 336 __func__, *((u32 *)data)); 337 ret = dsp_cmx_conf(dsp, *((u32 *)data)); 338 /* dsp_cmx_hardware will also be called here */ 339 dsp_rx_off(dsp); 340 if (dsp_debug & DEBUG_DSP_CMX) 341 dsp_cmx_debug(dsp); 342 break; 343 case DSP_CONF_SPLIT: /* remove from conference */ 344 conf_split: 345 if (dsp_debug & DEBUG_DSP_CORE) 346 printk(KERN_DEBUG "%s: release conference\n", __func__); 347 ret = dsp_cmx_conf(dsp, 0); 348 /* dsp_cmx_hardware will also be called here */ 349 if (dsp_debug & DEBUG_DSP_CMX) 350 dsp_cmx_debug(dsp); 351 dsp_rx_off(dsp); 352 break; 353 case DSP_TONE_PATT_ON: /* play tone */ 354 if (dsp->hdlc) { 355 ret = -EINVAL; 356 break; 357 } 358 if (len < sizeof(int)) { 359 ret = -EINVAL; 360 break; 361 } 362 if (dsp_debug & DEBUG_DSP_CORE) 363 printk(KERN_DEBUG "%s: turn tone 0x%x on\n", 364 __func__, *((int *)skb->data)); 365 ret = dsp_tone(dsp, *((int *)data)); 366 if (!ret) { 367 dsp_cmx_hardware(dsp->conf, dsp); 368 dsp_rx_off(dsp); 369 } 370 if (!dsp->tone.tone) 371 goto tone_off; 372 break; 373 case DSP_TONE_PATT_OFF: /* stop tone */ 374 if (dsp->hdlc) { 375 ret = -EINVAL; 376 break; 377 } 378 if (dsp_debug & DEBUG_DSP_CORE) 379 printk(KERN_DEBUG "%s: turn tone off\n", __func__); 380 dsp_tone(dsp, 0); 381 dsp_cmx_hardware(dsp->conf, dsp); 382 dsp_rx_off(dsp); 383 /* reset tx buffers (user space data) */ 384 tone_off: 385 dsp->rx_W = 0; 386 dsp->rx_R = 0; 387 break; 388 case DSP_VOL_CHANGE_TX: /* change volume */ 389 if (dsp->hdlc) { 390 ret = -EINVAL; 391 break; 392 } 393 if (len < sizeof(int)) { 394 ret = -EINVAL; 395 break; 396 } 397 dsp->tx_volume = *((int *)data); 398 if (dsp_debug & DEBUG_DSP_CORE) 399 printk(KERN_DEBUG "%s: change tx vol to %d\n", 400 __func__, dsp->tx_volume); 401 dsp_cmx_hardware(dsp->conf, dsp); 402 dsp_dtmf_hardware(dsp); 403 dsp_rx_off(dsp); 404 break; 405 case DSP_VOL_CHANGE_RX: /* change volume */ 406 if (dsp->hdlc) { 407 ret = -EINVAL; 408 break; 409 } 410 if (len < sizeof(int)) { 411 ret = -EINVAL; 412 break; 413 } 414 dsp->rx_volume = *((int *)data); 415 if (dsp_debug & DEBUG_DSP_CORE) 416 printk(KERN_DEBUG "%s: change rx vol to %d\n", 417 __func__, dsp->tx_volume); 418 dsp_cmx_hardware(dsp->conf, dsp); 419 dsp_dtmf_hardware(dsp); 420 dsp_rx_off(dsp); 421 break; 422 case DSP_ECHO_ON: /* enable echo */ 423 dsp->echo.software = 1; /* soft echo */ 424 if (dsp_debug & DEBUG_DSP_CORE) 425 printk(KERN_DEBUG "%s: enable cmx-echo\n", __func__); 426 dsp_cmx_hardware(dsp->conf, dsp); 427 dsp_rx_off(dsp); 428 if (dsp_debug & DEBUG_DSP_CMX) 429 dsp_cmx_debug(dsp); 430 break; 431 case DSP_ECHO_OFF: /* disable echo */ 432 dsp->echo.software = 0; 433 dsp->echo.hardware = 0; 434 if (dsp_debug & DEBUG_DSP_CORE) 435 printk(KERN_DEBUG "%s: disable cmx-echo\n", __func__); 436 dsp_cmx_hardware(dsp->conf, dsp); 437 dsp_rx_off(dsp); 438 if (dsp_debug & DEBUG_DSP_CMX) 439 dsp_cmx_debug(dsp); 440 break; 441 case DSP_RECEIVE_ON: /* enable receive to user space */ 442 if (dsp_debug & DEBUG_DSP_CORE) 443 printk(KERN_DEBUG "%s: enable receive to user " 444 "space\n", __func__); 445 dsp->rx_disabled = 0; 446 dsp_rx_off(dsp); 447 break; 448 case DSP_RECEIVE_OFF: /* disable receive to user space */ 449 if (dsp_debug & DEBUG_DSP_CORE) 450 printk(KERN_DEBUG "%s: disable receive to " 451 "user space\n", __func__); 452 dsp->rx_disabled = 1; 453 dsp_rx_off(dsp); 454 break; 455 case DSP_MIX_ON: /* enable mixing of tx data */ 456 if (dsp->hdlc) { 457 ret = -EINVAL; 458 break; 459 } 460 if (dsp_debug & DEBUG_DSP_CORE) 461 printk(KERN_DEBUG "%s: enable mixing of " 462 "tx-data with conf members\n", __func__); 463 dsp->tx_mix = 1; 464 dsp_cmx_hardware(dsp->conf, dsp); 465 dsp_rx_off(dsp); 466 if (dsp_debug & DEBUG_DSP_CMX) 467 dsp_cmx_debug(dsp); 468 break; 469 case DSP_MIX_OFF: /* disable mixing of tx data */ 470 if (dsp->hdlc) { 471 ret = -EINVAL; 472 break; 473 } 474 if (dsp_debug & DEBUG_DSP_CORE) 475 printk(KERN_DEBUG "%s: disable mixing of " 476 "tx-data with conf members\n", __func__); 477 dsp->tx_mix = 0; 478 dsp_cmx_hardware(dsp->conf, dsp); 479 dsp_rx_off(dsp); 480 if (dsp_debug & DEBUG_DSP_CMX) 481 dsp_cmx_debug(dsp); 482 break; 483 case DSP_TXDATA_ON: /* enable txdata */ 484 dsp->tx_data = 1; 485 if (dsp_debug & DEBUG_DSP_CORE) 486 printk(KERN_DEBUG "%s: enable tx-data\n", __func__); 487 dsp_cmx_hardware(dsp->conf, dsp); 488 dsp_rx_off(dsp); 489 if (dsp_debug & DEBUG_DSP_CMX) 490 dsp_cmx_debug(dsp); 491 break; 492 case DSP_TXDATA_OFF: /* disable txdata */ 493 dsp->tx_data = 0; 494 if (dsp_debug & DEBUG_DSP_CORE) 495 printk(KERN_DEBUG "%s: disable tx-data\n", __func__); 496 dsp_cmx_hardware(dsp->conf, dsp); 497 dsp_rx_off(dsp); 498 if (dsp_debug & DEBUG_DSP_CMX) 499 dsp_cmx_debug(dsp); 500 break; 501 case DSP_DELAY: /* use delay algorithm instead of dynamic 502 jitter algorithm */ 503 if (dsp->hdlc) { 504 ret = -EINVAL; 505 break; 506 } 507 if (len < sizeof(int)) { 508 ret = -EINVAL; 509 break; 510 } 511 dsp->cmx_delay = (*((int *)data)) << 3; 512 /* milliseconds to samples */ 513 if (dsp->cmx_delay >= (CMX_BUFF_HALF >> 1)) 514 /* clip to half of maximum usable buffer 515 (half of half buffer) */ 516 dsp->cmx_delay = (CMX_BUFF_HALF >> 1) - 1; 517 if (dsp_debug & DEBUG_DSP_CORE) 518 printk(KERN_DEBUG "%s: use delay algorithm to " 519 "compensate jitter (%d samples)\n", 520 __func__, dsp->cmx_delay); 521 break; 522 case DSP_JITTER: /* use dynamic jitter algorithm instead of 523 delay algorithm */ 524 if (dsp->hdlc) { 525 ret = -EINVAL; 526 break; 527 } 528 dsp->cmx_delay = 0; 529 if (dsp_debug & DEBUG_DSP_CORE) 530 printk(KERN_DEBUG "%s: use jitter algorithm to " 531 "compensate jitter\n", __func__); 532 break; 533 case DSP_TX_DEJITTER: /* use dynamic jitter algorithm for tx-buffer */ 534 if (dsp->hdlc) { 535 ret = -EINVAL; 536 break; 537 } 538 dsp->tx_dejitter = 1; 539 if (dsp_debug & DEBUG_DSP_CORE) 540 printk(KERN_DEBUG "%s: use dejitter on TX " 541 "buffer\n", __func__); 542 break; 543 case DSP_TX_DEJ_OFF: /* use tx-buffer without dejittering*/ 544 if (dsp->hdlc) { 545 ret = -EINVAL; 546 break; 547 } 548 dsp->tx_dejitter = 0; 549 if (dsp_debug & DEBUG_DSP_CORE) 550 printk(KERN_DEBUG "%s: use TX buffer without " 551 "dejittering\n", __func__); 552 break; 553 case DSP_PIPELINE_CFG: 554 if (dsp->hdlc) { 555 ret = -EINVAL; 556 break; 557 } 558 if (len > 0 && ((char *)data)[len - 1]) { 559 printk(KERN_DEBUG "%s: pipeline config string " 560 "is not NULL terminated!\n", __func__); 561 ret = -EINVAL; 562 } else { 563 dsp->pipeline.inuse = 1; 564 dsp_cmx_hardware(dsp->conf, dsp); 565 ret = dsp_pipeline_build(&dsp->pipeline, 566 len > 0 ? data : NULL); 567 dsp_cmx_hardware(dsp->conf, dsp); 568 dsp_rx_off(dsp); 569 } 570 break; 571 case DSP_BF_ENABLE_KEY: /* turn blowfish on */ 572 if (dsp->hdlc) { 573 ret = -EINVAL; 574 break; 575 } 576 if (len < 4 || len > 56) { 577 ret = -EINVAL; 578 break; 579 } 580 if (dsp_debug & DEBUG_DSP_CORE) 581 printk(KERN_DEBUG "%s: turn blowfish on (key " 582 "not shown)\n", __func__); 583 ret = dsp_bf_init(dsp, (u8 *)data, len); 584 /* set new cont */ 585 if (!ret) 586 cont = DSP_BF_ACCEPT; 587 else 588 cont = DSP_BF_REJECT; 589 /* send indication if it worked to set it */ 590 nskb = _alloc_mISDN_skb(PH_CONTROL_IND, MISDN_ID_ANY, 591 sizeof(int), &cont, GFP_ATOMIC); 592 if (nskb) { 593 if (dsp->up) { 594 if (dsp->up->send(dsp->up, nskb)) 595 dev_kfree_skb(nskb); 596 } else 597 dev_kfree_skb(nskb); 598 } 599 if (!ret) { 600 dsp_cmx_hardware(dsp->conf, dsp); 601 dsp_dtmf_hardware(dsp); 602 dsp_rx_off(dsp); 603 } 604 break; 605 case DSP_BF_DISABLE: /* turn blowfish off */ 606 if (dsp->hdlc) { 607 ret = -EINVAL; 608 break; 609 } 610 if (dsp_debug & DEBUG_DSP_CORE) 611 printk(KERN_DEBUG "%s: turn blowfish off\n", __func__); 612 dsp_bf_cleanup(dsp); 613 dsp_cmx_hardware(dsp->conf, dsp); 614 dsp_dtmf_hardware(dsp); 615 dsp_rx_off(dsp); 616 break; 617 default: 618 if (dsp_debug & DEBUG_DSP_CORE) 619 printk(KERN_DEBUG "%s: ctrl req %x unhandled\n", 620 __func__, cont); 621 ret = -EINVAL; 622 } 623 return ret; 624} 625 626static void 627get_features(struct mISDNchannel *ch) 628{ 629 struct dsp *dsp = container_of(ch, struct dsp, ch); 630 struct mISDN_ctrl_req cq; 631 632 if (!ch->peer) { 633 if (dsp_debug & DEBUG_DSP_CORE) 634 printk(KERN_DEBUG "%s: no peer, no features\n", 635 __func__); 636 return; 637 } 638 memset(&cq, 0, sizeof(cq)); 639 cq.op = MISDN_CTRL_GETOP; 640 if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq) < 0) { 641 printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n", 642 __func__); 643 return; 644 } 645 if (cq.op & MISDN_CTRL_RX_OFF) 646 dsp->features_rx_off = 1; 647 if (cq.op & MISDN_CTRL_FILL_EMPTY) 648 dsp->features_fill_empty = 1; 649 if (dsp_options & DSP_OPT_NOHARDWARE) 650 return; 651 if ((cq.op & MISDN_CTRL_HW_FEATURES_OP)) { 652 cq.op = MISDN_CTRL_HW_FEATURES; 653 *((u_long *)&cq.p1) = (u_long)&dsp->features; 654 if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq)) { 655 printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n", 656 __func__); 657 } 658 } else 659 if (dsp_debug & DEBUG_DSP_CORE) 660 printk(KERN_DEBUG "%s: features not supported for %s\n", 661 __func__, dsp->name); 662} 663 664static int 665dsp_function(struct mISDNchannel *ch, struct sk_buff *skb) 666{ 667 struct dsp *dsp = container_of(ch, struct dsp, ch); 668 struct mISDNhead *hh; 669 int ret = 0; 670 u8 *digits = NULL; 671 u_long flags; 672 673 hh = mISDN_HEAD_P(skb); 674 switch (hh->prim) { 675 /* FROM DOWN */ 676 case (PH_DATA_CNF): 677 dsp->data_pending = 0; 678 /* trigger next hdlc frame, if any */ 679 if (dsp->hdlc) { 680 spin_lock_irqsave(&dsp_lock, flags); 681 if (dsp->b_active) 682 schedule_work(&dsp->workq); 683 spin_unlock_irqrestore(&dsp_lock, flags); 684 } 685 break; 686 case (PH_DATA_IND): 687 case (DL_DATA_IND): 688 if (skb->len < 1) { 689 ret = -EINVAL; 690 break; 691 } 692 if (dsp->rx_is_off) { 693 if (dsp_debug & DEBUG_DSP_CORE) 694 printk(KERN_DEBUG "%s: rx-data during rx_off" 695 " for %s\n", 696 __func__, dsp->name); 697 } 698 if (dsp->hdlc) { 699 /* hdlc */ 700 spin_lock_irqsave(&dsp_lock, flags); 701 dsp_cmx_hdlc(dsp, skb); 702 spin_unlock_irqrestore(&dsp_lock, flags); 703 if (dsp->rx_disabled) { 704 /* if receive is not allowed */ 705 break; 706 } 707 hh->prim = DL_DATA_IND; 708 if (dsp->up) 709 return dsp->up->send(dsp->up, skb); 710 break; 711 } 712 713 spin_lock_irqsave(&dsp_lock, flags); 714 715 /* decrypt if enabled */ 716 if (dsp->bf_enable) 717 dsp_bf_decrypt(dsp, skb->data, skb->len); 718 /* pipeline */ 719 if (dsp->pipeline.inuse) 720 dsp_pipeline_process_rx(&dsp->pipeline, skb->data, 721 skb->len, hh->id); 722 /* change volume if requested */ 723 if (dsp->rx_volume) 724 dsp_change_volume(skb, dsp->rx_volume); 725 /* check if dtmf soft decoding is turned on */ 726 if (dsp->dtmf.software) { 727 digits = dsp_dtmf_goertzel_decode(dsp, skb->data, 728 skb->len, (dsp_options & DSP_OPT_ULAW) ? 1 : 0); 729 } 730 /* we need to process receive data if software */ 731 if (dsp->conf && dsp->conf->software) { 732 /* process data from card at cmx */ 733 dsp_cmx_receive(dsp, skb); 734 } 735 736 spin_unlock_irqrestore(&dsp_lock, flags); 737 738 /* send dtmf result, if any */ 739 if (digits) { 740 while (*digits) { 741 int k; 742 struct sk_buff *nskb; 743 if (dsp_debug & DEBUG_DSP_DTMF) 744 printk(KERN_DEBUG "%s: digit" 745 "(%c) to layer %s\n", 746 __func__, *digits, dsp->name); 747 k = *digits | DTMF_TONE_VAL; 748 nskb = _alloc_mISDN_skb(PH_CONTROL_IND, 749 MISDN_ID_ANY, sizeof(int), &k, 750 GFP_ATOMIC); 751 if (nskb) { 752 if (dsp->up) { 753 if (dsp->up->send( 754 dsp->up, nskb)) 755 dev_kfree_skb(nskb); 756 } else 757 dev_kfree_skb(nskb); 758 } 759 digits++; 760 } 761 } 762 if (dsp->rx_disabled) { 763 /* if receive is not allowed */ 764 break; 765 } 766 hh->prim = DL_DATA_IND; 767 if (dsp->up) 768 return dsp->up->send(dsp->up, skb); 769 break; 770 case (PH_CONTROL_IND): 771 if (dsp_debug & DEBUG_DSP_DTMFCOEFF) 772 printk(KERN_DEBUG "%s: PH_CONTROL INDICATION " 773 "received: %x (len %d) %s\n", __func__, 774 hh->id, skb->len, dsp->name); 775 switch (hh->id) { 776 case (DTMF_HFC_COEF): /* getting coefficients */ 777 if (!dsp->dtmf.hardware) { 778 if (dsp_debug & DEBUG_DSP_DTMFCOEFF) 779 printk(KERN_DEBUG "%s: ignoring DTMF " 780 "coefficients from HFC\n", 781 __func__); 782 break; 783 } 784 digits = dsp_dtmf_goertzel_decode(dsp, skb->data, 785 skb->len, 2); 786 while (*digits) { 787 int k; 788 struct sk_buff *nskb; 789 if (dsp_debug & DEBUG_DSP_DTMF) 790 printk(KERN_DEBUG "%s: digit" 791 "(%c) to layer %s\n", 792 __func__, *digits, dsp->name); 793 k = *digits | DTMF_TONE_VAL; 794 nskb = _alloc_mISDN_skb(PH_CONTROL_IND, 795 MISDN_ID_ANY, sizeof(int), &k, 796 GFP_ATOMIC); 797 if (nskb) { 798 if (dsp->up) { 799 if (dsp->up->send( 800 dsp->up, nskb)) 801 dev_kfree_skb(nskb); 802 } else 803 dev_kfree_skb(nskb); 804 } 805 digits++; 806 } 807 break; 808 case (HFC_VOL_CHANGE_TX): /* change volume */ 809 if (skb->len != sizeof(int)) { 810 ret = -EINVAL; 811 break; 812 } 813 spin_lock_irqsave(&dsp_lock, flags); 814 dsp->tx_volume = *((int *)skb->data); 815 if (dsp_debug & DEBUG_DSP_CORE) 816 printk(KERN_DEBUG "%s: change tx volume to " 817 "%d\n", __func__, dsp->tx_volume); 818 dsp_cmx_hardware(dsp->conf, dsp); 819 dsp_dtmf_hardware(dsp); 820 dsp_rx_off(dsp); 821 spin_unlock_irqrestore(&dsp_lock, flags); 822 break; 823 default: 824 if (dsp_debug & DEBUG_DSP_CORE) 825 printk(KERN_DEBUG "%s: ctrl ind %x unhandled " 826 "%s\n", __func__, hh->id, dsp->name); 827 ret = -EINVAL; 828 } 829 break; 830 case (PH_ACTIVATE_IND): 831 case (PH_ACTIVATE_CNF): 832 if (dsp_debug & DEBUG_DSP_CORE) 833 printk(KERN_DEBUG "%s: b_channel is now active %s\n", 834 __func__, dsp->name); 835 /* bchannel now active */ 836 spin_lock_irqsave(&dsp_lock, flags); 837 dsp->b_active = 1; 838 dsp->data_pending = 0; 839 dsp->rx_init = 1; 840 /* rx_W and rx_R will be adjusted on first frame */ 841 dsp->rx_W = 0; 842 dsp->rx_R = 0; 843 memset(dsp->rx_buff, 0, sizeof(dsp->rx_buff)); 844 dsp_cmx_hardware(dsp->conf, dsp); 845 dsp_dtmf_hardware(dsp); 846 dsp_rx_off(dsp); 847 spin_unlock_irqrestore(&dsp_lock, flags); 848 if (dsp_debug & DEBUG_DSP_CORE) 849 printk(KERN_DEBUG "%s: done with activation, sending " 850 "confirm to user space. %s\n", __func__, 851 dsp->name); 852 /* send activation to upper layer */ 853 hh->prim = DL_ESTABLISH_CNF; 854 if (dsp->up) 855 return dsp->up->send(dsp->up, skb); 856 break; 857 case (PH_DEACTIVATE_IND): 858 case (PH_DEACTIVATE_CNF): 859 if (dsp_debug & DEBUG_DSP_CORE) 860 printk(KERN_DEBUG "%s: b_channel is now inactive %s\n", 861 __func__, dsp->name); 862 /* bchannel now inactive */ 863 spin_lock_irqsave(&dsp_lock, flags); 864 dsp->b_active = 0; 865 dsp->data_pending = 0; 866 dsp_cmx_hardware(dsp->conf, dsp); 867 dsp_rx_off(dsp); 868 spin_unlock_irqrestore(&dsp_lock, flags); 869 hh->prim = DL_RELEASE_CNF; 870 if (dsp->up) 871 return dsp->up->send(dsp->up, skb); 872 break; 873 /* FROM UP */ 874 case (DL_DATA_REQ): 875 case (PH_DATA_REQ): 876 if (skb->len < 1) { 877 ret = -EINVAL; 878 break; 879 } 880 if (dsp->hdlc) { 881 /* hdlc */ 882 if (!dsp->b_active) { 883 ret = -EIO; 884 break; 885 } 886 hh->prim = PH_DATA_REQ; 887 spin_lock_irqsave(&dsp_lock, flags); 888 skb_queue_tail(&dsp->sendq, skb); 889 schedule_work(&dsp->workq); 890 spin_unlock_irqrestore(&dsp_lock, flags); 891 return 0; 892 } 893 /* send data to tx-buffer (if no tone is played) */ 894 if (!dsp->tone.tone) { 895 spin_lock_irqsave(&dsp_lock, flags); 896 dsp_cmx_transmit(dsp, skb); 897 spin_unlock_irqrestore(&dsp_lock, flags); 898 } 899 break; 900 case (PH_CONTROL_REQ): 901 spin_lock_irqsave(&dsp_lock, flags); 902 ret = dsp_control_req(dsp, hh, skb); 903 spin_unlock_irqrestore(&dsp_lock, flags); 904 break; 905 case (DL_ESTABLISH_REQ): 906 case (PH_ACTIVATE_REQ): 907 if (dsp_debug & DEBUG_DSP_CORE) 908 printk(KERN_DEBUG "%s: activating b_channel %s\n", 909 __func__, dsp->name); 910 if (dsp->dtmf.hardware || dsp->dtmf.software) 911 dsp_dtmf_goertzel_init(dsp); 912 get_features(ch); 913 /* enable fill_empty feature */ 914 if (dsp->features_fill_empty) 915 dsp_fill_empty(dsp); 916 /* send ph_activate */ 917 hh->prim = PH_ACTIVATE_REQ; 918 if (ch->peer) 919 return ch->recv(ch->peer, skb); 920 break; 921 case (DL_RELEASE_REQ): 922 case (PH_DEACTIVATE_REQ): 923 if (dsp_debug & DEBUG_DSP_CORE) 924 printk(KERN_DEBUG "%s: releasing b_channel %s\n", 925 __func__, dsp->name); 926 spin_lock_irqsave(&dsp_lock, flags); 927 dsp->tone.tone = 0; 928 dsp->tone.hardware = 0; 929 dsp->tone.software = 0; 930 if (timer_pending(&dsp->tone.tl)) 931 timer_delete(&dsp->tone.tl); 932 if (dsp->conf) 933 dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be 934 called here */ 935 skb_queue_purge(&dsp->sendq); 936 spin_unlock_irqrestore(&dsp_lock, flags); 937 hh->prim = PH_DEACTIVATE_REQ; 938 if (ch->peer) 939 return ch->recv(ch->peer, skb); 940 break; 941 default: 942 if (dsp_debug & DEBUG_DSP_CORE) 943 printk(KERN_DEBUG "%s: msg %x unhandled %s\n", 944 __func__, hh->prim, dsp->name); 945 ret = -EINVAL; 946 } 947 if (!ret) 948 dev_kfree_skb(skb); 949 return ret; 950} 951 952static int 953dsp_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg) 954{ 955 struct dsp *dsp = container_of(ch, struct dsp, ch); 956 u_long flags; 957 958 if (debug & DEBUG_DSP_CTRL) 959 printk(KERN_DEBUG "%s:(%x)\n", __func__, cmd); 960 961 switch (cmd) { 962 case OPEN_CHANNEL: 963 break; 964 case CLOSE_CHANNEL: 965 if (dsp->ch.peer) 966 dsp->ch.peer->ctrl(dsp->ch.peer, CLOSE_CHANNEL, NULL); 967 968 /* wait until workqueue has finished, 969 * must lock here, or we may hit send-process currently 970 * queueing. */ 971 spin_lock_irqsave(&dsp_lock, flags); 972 dsp->b_active = 0; 973 spin_unlock_irqrestore(&dsp_lock, flags); 974 /* MUST not be locked, because it waits until queue is done. */ 975 cancel_work_sync(&dsp->workq); 976 spin_lock_irqsave(&dsp_lock, flags); 977 if (timer_pending(&dsp->tone.tl)) 978 timer_delete(&dsp->tone.tl); 979 skb_queue_purge(&dsp->sendq); 980 if (dsp_debug & DEBUG_DSP_CTRL) 981 printk(KERN_DEBUG "%s: releasing member %s\n", 982 __func__, dsp->name); 983 dsp->b_active = 0; 984 dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be called 985 here */ 986 dsp_pipeline_destroy(&dsp->pipeline); 987 988 if (dsp_debug & DEBUG_DSP_CTRL) 989 printk(KERN_DEBUG "%s: remove & destroy object %s\n", 990 __func__, dsp->name); 991 list_del(&dsp->list); 992 spin_unlock_irqrestore(&dsp_lock, flags); 993 994 if (dsp_debug & DEBUG_DSP_CTRL) 995 printk(KERN_DEBUG "%s: dsp instance released\n", 996 __func__); 997 vfree(dsp); 998 module_put(THIS_MODULE); 999 break; 1000 } 1001 return 0; 1002} 1003 1004static void 1005dsp_send_bh(struct work_struct *work) 1006{ 1007 struct dsp *dsp = container_of(work, struct dsp, workq); 1008 struct sk_buff *skb; 1009 struct mISDNhead *hh; 1010 1011 if (dsp->hdlc && dsp->data_pending) 1012 return; /* wait until data has been acknowledged */ 1013 1014 /* send queued data */ 1015 while ((skb = skb_dequeue(&dsp->sendq))) { 1016 /* in locked date, we must have still data in queue */ 1017 if (dsp->data_pending) { 1018 if (dsp_debug & DEBUG_DSP_CORE) 1019 printk(KERN_DEBUG "%s: fifo full %s, this is " 1020 "no bug!\n", __func__, dsp->name); 1021 /* flush transparent data, if not acked */ 1022 dev_kfree_skb(skb); 1023 continue; 1024 } 1025 hh = mISDN_HEAD_P(skb); 1026 if (hh->prim == DL_DATA_REQ) { 1027 /* send packet up */ 1028 if (dsp->up) { 1029 if (dsp->up->send(dsp->up, skb)) 1030 dev_kfree_skb(skb); 1031 } else 1032 dev_kfree_skb(skb); 1033 } else { 1034 /* send packet down */ 1035 if (dsp->ch.peer) { 1036 dsp->data_pending = 1; 1037 if (dsp->ch.recv(dsp->ch.peer, skb)) { 1038 dev_kfree_skb(skb); 1039 dsp->data_pending = 0; 1040 } 1041 } else 1042 dev_kfree_skb(skb); 1043 } 1044 } 1045} 1046 1047static int 1048dspcreate(struct channel_req *crq) 1049{ 1050 struct dsp *ndsp; 1051 u_long flags; 1052 1053 if (crq->protocol != ISDN_P_B_L2DSP 1054 && crq->protocol != ISDN_P_B_L2DSPHDLC) 1055 return -EPROTONOSUPPORT; 1056 ndsp = vzalloc(sizeof(struct dsp)); 1057 if (!ndsp) { 1058 printk(KERN_ERR "%s: vmalloc struct dsp failed\n", __func__); 1059 return -ENOMEM; 1060 } 1061 if (dsp_debug & DEBUG_DSP_CTRL) 1062 printk(KERN_DEBUG "%s: creating new dsp instance\n", __func__); 1063 1064 /* default enabled */ 1065 INIT_WORK(&ndsp->workq, (void *)dsp_send_bh); 1066 skb_queue_head_init(&ndsp->sendq); 1067 ndsp->ch.send = dsp_function; 1068 ndsp->ch.ctrl = dsp_ctrl; 1069 ndsp->up = crq->ch; 1070 crq->ch = &ndsp->ch; 1071 if (crq->protocol == ISDN_P_B_L2DSP) { 1072 crq->protocol = ISDN_P_B_RAW; 1073 ndsp->hdlc = 0; 1074 } else { 1075 crq->protocol = ISDN_P_B_HDLC; 1076 ndsp->hdlc = 1; 1077 } 1078 if (!try_module_get(THIS_MODULE)) 1079 printk(KERN_WARNING "%s:cannot get module\n", 1080 __func__); 1081 1082 sprintf(ndsp->name, "DSP_C%x(0x%p)", 1083 ndsp->up->st->dev->id + 1, ndsp); 1084 /* set frame size to start */ 1085 ndsp->features.hfc_id = -1; /* current PCM id */ 1086 ndsp->features.pcm_id = -1; /* current PCM id */ 1087 ndsp->pcm_slot_rx = -1; /* current CPM slot */ 1088 ndsp->pcm_slot_tx = -1; 1089 ndsp->pcm_bank_rx = -1; 1090 ndsp->pcm_bank_tx = -1; 1091 ndsp->hfc_conf = -1; /* current conference number */ 1092 /* set tone timer */ 1093 timer_setup(&ndsp->tone.tl, dsp_tone_timeout, 0); 1094 1095 if (dtmfthreshold < 20 || dtmfthreshold > 500) 1096 dtmfthreshold = 200; 1097 ndsp->dtmf.treshold = dtmfthreshold * 10000; 1098 1099 /* init pipeline append to list */ 1100 spin_lock_irqsave(&dsp_lock, flags); 1101 dsp_pipeline_init(&ndsp->pipeline); 1102 list_add_tail(&ndsp->list, &dsp_ilist); 1103 spin_unlock_irqrestore(&dsp_lock, flags); 1104 1105 return 0; 1106} 1107 1108 1109static struct Bprotocol DSP = { 1110 .Bprotocols = (1 << (ISDN_P_B_L2DSP & ISDN_P_B_MASK)) 1111 | (1 << (ISDN_P_B_L2DSPHDLC & ISDN_P_B_MASK)), 1112 .name = "dsp", 1113 .create = dspcreate 1114}; 1115 1116static int __init dsp_init(void) 1117{ 1118 int err; 1119 int tics; 1120 1121 printk(KERN_INFO "DSP module %s\n", mISDN_dsp_revision); 1122 1123 dsp_options = options; 1124 dsp_debug = debug; 1125 1126 /* set packet size */ 1127 dsp_poll = poll; 1128 if (dsp_poll) { 1129 if (dsp_poll > MAX_POLL) { 1130 printk(KERN_ERR "%s: Wrong poll value (%d), use %d " 1131 "maximum.\n", __func__, poll, MAX_POLL); 1132 err = -EINVAL; 1133 return err; 1134 } 1135 if (dsp_poll < 8) { 1136 printk(KERN_ERR "%s: Wrong poll value (%d), use 8 " 1137 "minimum.\n", __func__, dsp_poll); 1138 err = -EINVAL; 1139 return err; 1140 } 1141 dsp_tics = poll * HZ / 8000; 1142 if (dsp_tics * 8000 != poll * HZ) { 1143 printk(KERN_INFO "mISDN_dsp: Cannot clock every %d " 1144 "samples (0,125 ms). It is not a multiple of " 1145 "%d HZ.\n", poll, HZ); 1146 err = -EINVAL; 1147 return err; 1148 } 1149 } else { 1150 poll = 8; 1151 while (poll <= MAX_POLL) { 1152 tics = (poll * HZ) / 8000; 1153 if (tics * 8000 == poll * HZ) { 1154 dsp_tics = tics; 1155 dsp_poll = poll; 1156 if (poll >= 64) 1157 break; 1158 } 1159 poll++; 1160 } 1161 } 1162 if (dsp_poll == 0) { 1163 printk(KERN_INFO "mISDN_dsp: There is no multiple of kernel " 1164 "clock that equals exactly the duration of 8-256 " 1165 "samples. (Choose kernel clock speed like 100, 250, " 1166 "300, 1000)\n"); 1167 err = -EINVAL; 1168 return err; 1169 } 1170 printk(KERN_INFO "mISDN_dsp: DSP clocks every %d samples. This equals " 1171 "%d jiffies.\n", dsp_poll, dsp_tics); 1172 1173 /* init conversion tables */ 1174 dsp_audio_generate_law_tables(); 1175 dsp_silence = (dsp_options & DSP_OPT_ULAW) ? 0xff : 0x2a; 1176 dsp_audio_law_to_s32 = (dsp_options & DSP_OPT_ULAW) ? 1177 dsp_audio_ulaw_to_s32 : dsp_audio_alaw_to_s32; 1178 dsp_audio_generate_s2law_table(); 1179 dsp_audio_generate_seven(); 1180 dsp_audio_generate_mix_table(); 1181 if (dsp_options & DSP_OPT_ULAW) 1182 dsp_audio_generate_ulaw_samples(); 1183 dsp_audio_generate_volume_changes(); 1184 1185 err = dsp_pipeline_module_init(); 1186 if (err) { 1187 printk(KERN_ERR "mISDN_dsp: Can't initialize pipeline, " 1188 "error(%d)\n", err); 1189 return err; 1190 } 1191 1192 err = mISDN_register_Bprotocol(&DSP); 1193 if (err) { 1194 printk(KERN_ERR "Can't register %s error(%d)\n", DSP.name, err); 1195 return err; 1196 } 1197 1198 /* set sample timer */ 1199 timer_setup(&dsp_spl_tl, dsp_cmx_send, 0); 1200 dsp_spl_tl.expires = jiffies + dsp_tics; 1201 dsp_spl_jiffies = dsp_spl_tl.expires; 1202 add_timer(&dsp_spl_tl); 1203 1204 return 0; 1205} 1206 1207 1208static void __exit dsp_cleanup(void) 1209{ 1210 mISDN_unregister_Bprotocol(&DSP); 1211 1212 timer_delete_sync(&dsp_spl_tl); 1213 1214 if (!list_empty(&dsp_ilist)) { 1215 printk(KERN_ERR "mISDN_dsp: Audio DSP object inst list not " 1216 "empty.\n"); 1217 } 1218 if (!list_empty(&conf_ilist)) { 1219 printk(KERN_ERR "mISDN_dsp: Conference list not empty. Not " 1220 "all memory freed.\n"); 1221 } 1222 1223 dsp_pipeline_module_exit(); 1224} 1225 1226module_init(dsp_init); 1227module_exit(dsp_cleanup);
~/
Read-only file preview.