channels/chan_phone.c

   1 /*
   2  * Asterisk -- A telephony toolkit for Linux.
   3  *
   4  * Generic Linux Telephony Interface driver
   5  *
   6  * Copyright (C) 1999, Mark Spencer
   7  *
   8  * Mark Spencer <markster@linux-support.net>
   9  *
  10  * This program is free software, distributed under the terms of
  11  * the GNU General Public License
  12  */
  13
  14 #include <stdio.h>
  15 #include <pthread.h>
  16 #include <string.h>
  17 #include <asterisk/channel.h>
  18 #include <asterisk/channel_pvt.h>
  19 #include <asterisk/config.h>
  20 #include <asterisk/logger.h>
  21 #include <asterisk/module.h>
  22 #include <asterisk/pbx.h>
  23 #include <asterisk/options.h>
  24 #include <sys/socket.h>
  25 #include <sys/time.h>
  26 #include <errno.h>
  27 #include <unistd.h>
  28 #include <stdlib.h>
  29 #include <arpa/inet.h>
  30 #include <fcntl.h>
  31 #include <sys/ioctl.h>
  32 #include <linux/telephony.h>
  33 /* Still use some IXJ specific stuff */
  34 #include <linux/ixjuser.h>
  35 #include "DialTone.h"
  36
  37 #define phone_MAX_BUF 480
  38
  39 static char *desc = "Linux Telephony API Support";
  40 static char *type = "Phone";
  41 static char *tdesc = "Standard Linux Telephony API Driver";
  42 static char *config = "phone.conf";
  43
  44 /* Default context for dialtone mode */
  45 static char context[AST_MAX_EXTENSION] = "default";
  46
  47 static int usecnt =0;
  48
  49 static int echocancel = AEC_OFF;
  50
  51 static int silencesupression = 0;
  52
  53 static int prefformat = AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR;
  54
  55 static pthread_mutex_t usecnt_lock = PTHREAD_MUTEX_INITIALIZER;
  56
  57 /* Protect the interface list (of phone_pvt's) */
  58 static pthread_mutex_t iflock = PTHREAD_MUTEX_INITIALIZER;
  59
  60 /* Protect the monitoring thread, so only one process can kill or start it, and not
  61    when it's doing something critical. */
  62 static pthread_mutex_t monlock = PTHREAD_MUTEX_INITIALIZER;
  63
  64 /* This is the thread for the monitor which checks for input on the channels
  65    which are not currently in use.  */
  66 static pthread_t monitor_thread = -1;
  67
  68 static int restart_monitor(void);
  69
  70 /* The private structures of the Phone Jack channels are linked for
  71    selecting outgoing channels */
  72
  73 #define MODE_DIALTONE   1
  74 #define MODE_IMMEDIATE  2
  75
  76 static struct phone_pvt {
  77         int fd;                                                 /* Raw file descriptor for this device */
  78         struct ast_channel *owner;              /* Channel we belong to, possibly NULL */
  79         int mode;                                               /* Is this in the  */
  80         int lastformat;                                 /* Last output format */
  81         int lastinput;                                  /* Last input format */
  82         int ministate;                                  /* Miniature state, for dialtone mode */
  83         char dev[256];                                  /* Device name */
  84         struct phone_pvt *next;                 /* Next channel in list */
  85         struct ast_frame fr;                    /* Frame */
  86         char offset[AST_FRIENDLY_OFFSET];
  87         char buf[phone_MAX_BUF];                                        /* Static buffer for reading frames */
  88         int obuflen;
  89         int dialtone;
  90         int silencesupression;
  91         char context[AST_MAX_EXTENSION];
  92         char obuf[phone_MAX_BUF * 2];
  93         char ext[AST_MAX_EXTENSION];
  94 } *iflist = NULL;
  95
  96 static int phone_digit(struct ast_channel *ast, char digit)
  97 {
  98         struct phone_pvt *p;
  99         int outdigit;
 100         p = ast->pvt->pvt;
 101         switch(digit) {
 102         case '0':
 103         case '1':
 104         case '2':
 105         case '3':
 106         case '4':
 107         case '5':
 108         case '6':
 109         case '7':
 110         case '8':
 111         case '9':
 112                 outdigit = digit - '0' + 1;
 113                 break;
 114         case '*':
 115                 outdigit = 11;
 116                 break;
 117         case '#':
 118                 outdigit = 12;
 119                 break;
 120         default:
 121                 ast_log(LOG_WARNING, "Unknown digit '%c'\n", digit);
 122                 return -1;
 123         }
 124         ioctl(p->fd, PHONE_PLAY_TONE, digit);
 125         return 0;
 126 }
 127
 128 static int phone_call(struct ast_channel *ast, char *dest, int timeout)
 129 {
 130         struct phone_pvt *p;
 131         p = ast->pvt->pvt;
 132         if ((ast->state != AST_STATE_DOWN) && (ast->state != AST_STATE_RESERVED)) {
 133                 ast_log(LOG_WARNING, "phone_call called on %s, neither down nor reserved\n", ast->name);
 134                 return -1;
 135         }
 136         /* When we call, it just works, really, there's no destination...  Just
 137            ring the phone and wait for someone to answer */
 138         if (option_debug)
 139                 ast_log(LOG_DEBUG, "Ringing %s on %s (%d)\n", dest, ast->name, ast->fd);
 140         ioctl(p->fd, PHONE_RING_START);
 141         ast->state = AST_STATE_RINGING;
 142         return 0;
 143 }
 144
 145 static int phone_hangup(struct ast_channel *ast)
 146 {
 147         struct phone_pvt *p;
 148         p = ast->pvt->pvt;
 149         if (option_debug)
 150                 ast_log(LOG_DEBUG, "phone_hangup(%s)\n", ast->name);
 151         if (!ast->pvt->pvt) {
 152                 ast_log(LOG_WARNING, "Asked to hangup channel not connected\n");
 153                 return 0;
 154         }
 155         /* XXX Is there anything we can do to really hang up except stop recording? */
 156         ast->state = AST_STATE_DOWN;
 157         if (ioctl(p->fd, PHONE_REC_STOP))
 158                 ast_log(LOG_WARNING, "Failed to stop recording\n");
 159         if (ioctl(p->fd, PHONE_PLAY_STOP))
 160                 ast_log(LOG_WARNING, "Failed to stop playing\n");
 161         if (ioctl(p->fd, PHONE_RING_STOP))
 162                 ast_log(LOG_WARNING, "Failed to stop ringing\n");
 163         if (ioctl(p->fd, PHONE_CPT_STOP))
 164                 ast_log(LOG_WARNING, "Failed to stop sounds\n");
 165         /* If they're off hook, give a busy signal */
 166         if (ioctl(p->fd, PHONE_HOOKSTATE)) {
 167                 if (option_debug)
 168                         ast_log(LOG_DEBUG, "Got hunghup, giving busy signal\n");
 169                 ioctl(p->fd, PHONE_BUSY);
 170         }
 171         p->lastformat = -1;
 172         p->lastinput = -1;
 173         p->ministate = 0;
 174         p->obuflen = 0;
 175         p->dialtone = 0;
 176         memset(p->ext, 0, sizeof(p->ext));
 177         ((struct phone_pvt *)(ast->pvt->pvt))->owner = NULL;
 178         pthread_mutex_lock(&usecnt_lock);
 179         usecnt--;
 180         if (usecnt < 0)
 181                 ast_log(LOG_WARNING, "Usecnt < 0???\n");
 182         pthread_mutex_unlock(&usecnt_lock);
 183         ast_update_use_count();
 184         if (option_verbose > 2)
 185                 ast_verbose( VERBOSE_PREFIX_3 "Hungup '%s'\n", ast->name);
 186         ast->pvt->pvt = NULL;
 187         ast->state = AST_STATE_DOWN;
 188         restart_monitor();
 189         return 0;
 190 }
 191
 192 static int phone_setup(struct ast_channel *ast)
 193 {
 194         struct phone_pvt *p;
 195         p = ast->pvt->pvt;
 196         ioctl(p->fd, PHONE_CPT_STOP);
 197         /* Nothing to answering really, just start recording */
 198         if (ast->format & AST_FORMAT_G723_1) {
 199                 /* Prefer g723 */
 200                 ioctl(p->fd, PHONE_REC_STOP);
 201                 if (p->lastinput != AST_FORMAT_G723_1) {
 202                         p->lastinput = AST_FORMAT_G723_1;
 203                         if (ioctl(p->fd, PHONE_REC_CODEC, G723_63)) {
 204                                 ast_log(LOG_WARNING, "Failed to set codec to g723.1\n");
 205                                 return -1;
 206                         }
 207                 }
 208         } else if (ast->format & AST_FORMAT_SLINEAR) {
 209                 ioctl(p->fd, PHONE_REC_STOP);
 210                 if (p->lastinput != AST_FORMAT_SLINEAR) {
 211                         p->lastinput = AST_FORMAT_SLINEAR;
 212                         if (ioctl(p->fd, PHONE_REC_CODEC, LINEAR16)) {
 213                                 ast_log(LOG_WARNING, "Failed to set codec to signed linear 16\n");
 214                                 return -1;
 215                         }
 216                 }
 217         } else {
 218                 ast_log(LOG_WARNING, "Can't do format %d\n", ast->format);
 219                 return -1;
 220         }
 221         if (ioctl(p->fd, PHONE_REC_START)) {
 222                 ast_log(LOG_WARNING, "Failed to start recording\n");
 223                 return -1;
 224         }
 225         return 0;
 226 }
 227
 228 static int phone_answer(struct ast_channel *ast)
 229 {
 230         phone_setup(ast);
 231         if (option_debug)
 232                 ast_log(LOG_DEBUG, "phone_answer(%s)\n", ast->name);
 233         ast->rings = 0;
 234         ast->state = AST_STATE_UP;
 235         return 0;
 236 }
 237
 238 static char phone_2digit(char c)
 239 {
 240         if (c == 12)
 241                 return '#';
 242         else if (c == 11)
 243                 return '*';
 244         else if ((c < 10) && (c >= 0))
 245                 return '0' + c - 1;
 246         else
 247                 return '?';
 248 }
 249
 250 static struct ast_frame  *phone_read(struct ast_channel *ast)
 251 {
 252         int res;
 253         union telephony_exception phonee;
 254         struct phone_pvt *p = ast->pvt->pvt;
 255         char digit;
 256
 257         /* Some nice norms */
 258         p->fr.datalen = 0;
 259         p->fr.timelen = 0;
 260         p->fr.data =  NULL;
 261         p->fr.src = type;
 262         p->fr.offset = 0;
 263         p->fr.mallocd=0;
 264
 265         phonee.bytes = ioctl(p->fd, PHONE_EXCEPTION);
 266         if (phonee.bits.dtmf_ready)  {
 267                 /* We've got a digit -- Just handle this nicely and easily */
 268                 digit =  ioctl(p->fd, PHONE_GET_DTMF_ASCII);
 269                 p->fr.subclass = digit;
 270                 p->fr.frametype = AST_FRAME_DTMF;
 271                 return &p->fr;
 272         }
 273         if (phonee.bits.hookstate) {
 274                 res = ioctl(p->fd, PHONE_HOOKSTATE);
 275                 /* See if we've gone on hook, if so, notify by returning NULL */
 276                 if (!res)
 277                         return NULL;
 278                 else {
 279                         if (ast->state == AST_STATE_RINGING) {
 280                                 /* They've picked up the phone */
 281                                 p->fr.frametype = AST_FRAME_CONTROL;
 282                                 p->fr.subclass = AST_CONTROL_ANSWER;
 283                                 phone_setup(ast);
 284                                 ast->state = AST_STATE_UP;
 285                                 return &p->fr;
 286                         }  else
 287                                 ast_log(LOG_WARNING, "Got off hook in weird state %d\n", ast->state);
 288                 }
 289         }
 290 #if 0
 291         if (phonee.bits.pstn_ring)
 292                 ast_verbose("Unit is ringing\n");
 293         if (phonee.bits.caller_id) {
 294                 ast_verbose("We have caller ID: %s\n");
 295         }
 296 #endif
 297         /* Try to read some data... */
 298         CHECK_BLOCKING(ast);
 299         res = read(p->fd, p->buf, phone_MAX_BUF);
 300         ast->blocking = 0;
 301         if (res < 0) {
 302 #if 0
 303                 if (errno == EAGAIN) {
 304                         ast_log(LOG_WARNING, "Null frame received\n");
 305                         p->fr.frametype = AST_FRAME_NULL;
 306                         p->fr.subclass = 0;
 307                         return &p->fr;
 308                 }
 309 #endif
 310                 ast_log(LOG_WARNING, "Error reading: %s\n", strerror(errno));
 311                 return NULL;
 312         }
 313         p->fr.data = p->buf;
 314         switch(p->buf[0] & 0x3) {
 315         case '0':
 316         case '1':
 317                 /* Normal */
 318                 break;
 319         case '2':
 320         case '3':
 321                 /* VAD/CNG, only send two words */
 322                 res = 4;
 323                 break;
 324         }
 325         p->fr.datalen = res;
 326         p->fr.frametype = AST_FRAME_VOICE;
 327         p->fr.subclass = p->lastinput;
 328         p->fr.offset = AST_FRIENDLY_OFFSET;
 329         return &p->fr;
 330 }
 331
 332 static int phone_write_buf(struct phone_pvt *p, char *buf, int len, int frlen)
 333 {
 334         int res;
 335         /* Store as much of the buffer as we can, then write fixed frames */
 336         int space = sizeof(p->obuf) - p->obuflen;
 337         /* Make sure we have enough buffer space to store the frame */
 338         if (space < len)
 339                 len = space;
 340         memcpy(p->obuf + p->obuflen, buf, len);
 341         p->obuflen += len;
 342         while(p->obuflen > frlen) {
 343 #if 0
 344                 res = frlen;
 345                 ast_log(LOG_DEBUG, "Wrote %d bytes\n", res);
 346 #else
 347                 res = write(p->fd, p->obuf, frlen);
 348 #endif
 349                 if (res != frlen) {
 350                         if (res < 1) {
 351                                 ast_log(LOG_WARNING, "Write failed: %s\n", strerror(errno));
 352                                 return -1;
 353                         } else {
 354                                 ast_log(LOG_WARNING, "Only wrote %d of %d bytes\n", res, frlen);
 355                         }
 356                 }
 357                 p->obuflen -= frlen;
 358                 /* Move memory if necessary */
 359                 if (p->obuflen)
 360                         memmove(p->obuf, p->obuf + frlen, p->obuflen);
 361         }
 362         return len;
 363 }
 364
 365 static int phone_write(struct ast_channel *ast, struct ast_frame *frame)
 366 {
 367         struct phone_pvt *p = ast->pvt->pvt;
 368         int res;
 369         int maxfr=0;
 370         char *pos;
 371         int sofar;
 372         int expected;
 373         char tmpbuf[4];
 374         /* Write a frame of (presumably voice) data */
 375         if (frame->frametype != AST_FRAME_VOICE) {
 376                 ast_log(LOG_WARNING, "Don't know what to do with  frame type '%d'\n", frame->frametype);
 377                 ast_frfree(frame);
 378                 return -1;
 379         }
 380         if (!(frame->subclass & (AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR))) {
 381                 ast_log(LOG_WARNING, "Cannot handle frames in %d format\n", frame->subclass);
 382                 ast_frfree(frame);
 383                 return -1;
 384         }
 385         /* If we're not in up mode, go into up mode now */
 386         if (ast->state != AST_STATE_UP) {
 387                 ast->state = AST_STATE_UP;
 388                 phone_setup(ast);
 389         }
 390         if (frame->subclass == AST_FORMAT_G723_1) {
 391                 if (p->lastformat != AST_FORMAT_G723_1) {
 392                         ioctl(p->fd, PHONE_PLAY_STOP);
 393                         ioctl(p->fd, PHONE_REC_STOP);
 394                         if (ioctl(p->fd, PHONE_PLAY_CODEC, G723_63)) {
 395                                 ast_log(LOG_WARNING, "Unable to set G723.1 mode\n");
 396                                 return -1;
 397                         }
 398                         if (ioctl(p->fd, PHONE_REC_CODEC, G723_63)) {
 399                                 ast_log(LOG_WARNING, "Unable to set G723.1 mode\n");
 400                                 return -1;
 401                         }
 402                         p->lastformat = AST_FORMAT_G723_1;
 403                         p->lastinput = AST_FORMAT_G723_1;
 404                         /* Reset output buffer */
 405                         p->obuflen = 0;
 406                 }
 407                 if (frame->datalen > 24) {
 408                         ast_log(LOG_WARNING, "Frame size too large for G.723.1 (%d bytes)\n", frame->datalen);
 409                         return -1;
 410                 }
 411                 maxfr = 24;
 412         } else if (frame->subclass == AST_FORMAT_SLINEAR) {
 413                 if (p->lastformat != AST_FORMAT_SLINEAR) {
 414                         ioctl(p->fd, PHONE_PLAY_STOP);
 415                         ioctl(p->fd, PHONE_REC_STOP);
 416                         if (ioctl(p->fd, PHONE_PLAY_CODEC, LINEAR16)) {
 417                                 ast_log(LOG_WARNING, "Unable to set 16-bit linear mode\n");
 418                                 return -1;
 419                         }
 420                         if (ioctl(p->fd, PHONE_REC_CODEC, LINEAR16)) {
 421                                 ast_log(LOG_WARNING, "Unable to set 16-bit linear mode\n");
 422                                 return -1;
 423                         }
 424                         p->lastformat = AST_FORMAT_SLINEAR;
 425                         p->lastinput = AST_FORMAT_SLINEAR;
 426                         /* Reset output buffer */
 427                         p->obuflen = 0;
 428                 }
 429                 maxfr = 480;
 430         }
 431         if (ioctl(p->fd, PHONE_PLAY_START)) {
 432                 ast_log(LOG_WARNING, "Failed to start playback\n");
 433                 return -1;
 434         }
 435         if (ioctl(p->fd, PHONE_REC_START)) {
 436                 ast_log(LOG_WARNING, "Failed to start recording\n");
 437                 return -1;
 438         }
 439         /* If we get here, we have a voice frame of Appropriate data */
 440         sofar = 0;
 441         pos = frame->data;
 442         while(sofar < frame->datalen) {
 443                 /* Write in no more than maxfr sized frames */
 444                 expected = frame->datalen - sofar;
 445                 if (maxfr < expected)
 446                         expected = maxfr;
 447                 /* XXX Internet Phone Jack does not handle the 4-byte VAD frame properly! XXX
 448                    we have to pad it to 24 bytes still.  */
 449                 if (frame->datalen == 4) {
 450                         if (p->silencesupression) {
 451                                 memset(tmpbuf + 4, 0, sizeof(tmpbuf) - 4);
 452                                 memcpy(tmpbuf, frame->data, 4);
 453                                 expected = 24;
 454                                 res = phone_write_buf(p, tmpbuf, expected, maxfr);
 455                         }
 456                         res = 4;
 457                         expected=4;
 458                 } else {
 459                         res = phone_write_buf(p, pos, expected, maxfr);
 460                 }
 461                 if (res != expected) {
 462                         if (res < 0)
 463                                 ast_log(LOG_WARNING, "Write returned error (%s)\n", strerror(errno));
 464                         else
 465                                 ast_log(LOG_WARNING, "Only wrote %d of %d bytes\n", res, frame->datalen);
 466                         return -1;
 467                 }
 468                 sofar += res;
 469                 pos += res;
 470         }
 471         return 0;
 472 }
 473
 474 static struct ast_channel *phone_new(struct phone_pvt *i, int state, char *context)
 475 {
 476         struct ast_channel *tmp;
 477         tmp = ast_channel_alloc();
 478         if (tmp) {
 479                 snprintf(tmp->name, sizeof(tmp->name), "Phone/%s", i->dev + 5);
 480                 tmp->type = type;
 481                 tmp->fd = i->fd;
 482                 /* XXX Switching formats silently causes kernel panics XXX */
 483                 tmp->format = prefformat;
 484                 tmp->state = state;
 485                 if (state == AST_STATE_RING)
 486                         tmp->rings = 1;
 487                 tmp->pvt->pvt = i;
 488                 tmp->pvt->send_digit = phone_digit;
 489                 tmp->pvt->call = phone_call;
 490                 tmp->pvt->hangup = phone_hangup;
 491                 tmp->pvt->answer = phone_answer;
 492                 tmp->pvt->read = phone_read;
 493                 tmp->pvt->write = phone_write;
 494                 strncpy(tmp->context, context, sizeof(tmp->context));
 495                 if (strlen(i->ext))
 496                         strncpy(tmp->exten, i->ext, sizeof(tmp->exten));
 497                 i->owner = tmp;
 498                 pthread_mutex_lock(&usecnt_lock);
 499                 usecnt++;
 500                 pthread_mutex_unlock(&usecnt_lock);
 501                 ast_update_use_count();
 502                 if (state != AST_STATE_DOWN) {
 503                         if (state == AST_STATE_RING) {
 504                                 ioctl(tmp->fd, PHONE_RINGBACK);
 505                         }
 506                         if (ast_pbx_start(tmp)) {
 507                                 ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
 508                                 ast_hangup(tmp);
 509                         }
 510                 }
 511         } else
 512                 ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
 513         return tmp;
 514 }
 515
 516 static void phone_mini_packet(struct phone_pvt *i)
 517 {
 518         int res;
 519         char buf[1024];
 520         /* Ignore stuff we read... */
 521         res = read(i->fd, buf, sizeof(buf));
 522         if (res < 1) {
 523                 ast_log(LOG_WARNING, "Read returned %d\n", res);
 524                 return;
 525         }
 526 }
 527
 528 static void phone_check_exception(struct phone_pvt *i)
 529 {
 530         int offhook=0;
 531         char digit[2] = {0 , 0};
 532         union telephony_exception phonee;
 533         /* XXX Do something XXX */
 534 #if 0
 535         ast_log(LOG_DEBUG, "Exception!\n");
 536 #endif
 537         phonee.bytes = ioctl(i->fd, PHONE_EXCEPTION);
 538         if (phonee.bits.dtmf_ready)  {
 539                 digit[0] = ioctl(i->fd, PHONE_GET_DTMF_ASCII);
 540                 if (i->mode == MODE_DIALTONE) {
 541                         ioctl(i->fd, PHONE_PLAY_STOP);
 542                         ioctl(i->fd, PHONE_REC_STOP);
 543                         ioctl(i->fd, PHONE_CPT_STOP);
 544                         i->dialtone = 0;
 545                         if (strlen(i->ext) < AST_MAX_EXTENSION - 1)
 546                                 strcat(i->ext, digit);
 547                         if (ast_exists_extension(NULL, i->context, i->ext, 1)) {
 548                                 /* It's a valid extension in its context, get moving! */
 549                                 phone_new(i, AST_STATE_RING, i->context);
 550                                 /* No need to restart monitor, we are the monitor */
 551                                 if (i->owner) {
 552                                         pthread_mutex_lock(&usecnt_lock);
 553                                         usecnt--;
 554                                         pthread_mutex_unlock(&usecnt_lock);
 555                                         ast_update_use_count();
 556                                 }
 557                         } else if (!ast_canmatch_extension(NULL, i->context, i->ext, 1)) {
 558                                 /* There is nothing in the specified extension that can match anymore.
 559                                    Try the default */
 560                                 if (ast_exists_extension(NULL, "default", i->ext, 1)) {
 561                                         /* Check the default, too... */
 562                                         phone_new(i, AST_STATE_RING, "default");
 563                                         if (i->owner) {
 564                                                 pthread_mutex_lock(&usecnt_lock);
 565                                                 usecnt--;
 566                                                 pthread_mutex_unlock(&usecnt_lock);
 567                                                 ast_update_use_count();
 568                                         }
 569                                         /* XXX This should probably be justified better XXX */
 570                                 }  else if (!ast_canmatch_extension(NULL, "default", i->ext, 1)) {
 571                                         /* It's not a valid extension, give a busy signal */
 572                                         if (option_debug)
 573                                                 ast_log(LOG_DEBUG, "%s can't match anything in %s or default\n", i->ext, i->context);
 574                                         ioctl(i->fd, PHONE_BUSY);
 575                                 }
 576                         }
 577 #if 0
 578                         ast_verbose("Extension is %s\n", i->ext);
 579 #endif
 580                 }
 581         }
 582         if (phonee.bits.hookstate) {
 583                 offhook = ioctl(i->fd, PHONE_HOOKSTATE);
 584                 if (offhook) {
 585                         if (i->mode == MODE_IMMEDIATE) {
 586                                 phone_new(i, AST_STATE_RING, i->context);
 587                         } else if (i->mode == MODE_DIALTONE) {
 588                                 pthread_mutex_lock(&usecnt_lock);
 589                                 usecnt++;
 590                                 pthread_mutex_unlock(&usecnt_lock);
 591                                 ast_update_use_count();
 592                                 /* Reset the extension */
 593                                 i->ext[0] = '\0';
 594                                 /* Play the dialtone */
 595                                 i->dialtone++;
 596                                 ioctl(i->fd, PHONE_PLAY_STOP);
 597                                 ioctl(i->fd, PHONE_PLAY_CODEC, ULAW);
 598                                 ioctl(i->fd, PHONE_PLAY_START);
 599                         }
 600                 } else {
 601                         if (i->dialtone) {
 602                                 pthread_mutex_lock(&usecnt_lock);
 603                                 usecnt--;
 604                                 pthread_mutex_unlock(&usecnt_lock);
 605                                 ast_update_use_count();
 606                         }
 607                         memset(i->ext, 0, sizeof(i->ext));
 608                         ioctl(i->fd, PHONE_CPT_STOP);
 609                         ioctl(i->fd, PHONE_PLAY_STOP);
 610                         ioctl(i->fd, PHONE_REC_STOP);
 611                         i->dialtone = 0;
 612                 }
 613         }
 614         if (phonee.bits.pstn_ring)
 615                 ast_verbose("Unit is ringing\n");
 616         if (phonee.bits.caller_id)
 617                 ast_verbose("We have caller ID\n");
 618
 619
 620 }
 621
 622 static void *do_monitor(void *data)
 623 {
 624         fd_set rfds, efds;
 625         int n, res;
 626         struct phone_pvt *i;
 627         int tonepos = 0;
 628         /* The tone we're playing this round */
 629         struct timeval tv = {0,0};
 630         int dotone;
 631         /* This thread monitors all the frame relay interfaces which are not yet in use
 632            (and thus do not have a separate thread) indefinitely */
 633         /* From here on out, we die whenever asked */
 634         if (pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL)) {
 635                 ast_log(LOG_WARNING, "Unable to set cancel type to asynchronous\n");
 636                 return NULL;
 637         }
 638         for(;;) {
 639                 /* Don't let anybody kill us right away.  Nobody should lock the interface list
 640                    and wait for the monitor list, but the other way around is okay. */
 641                 if (pthread_mutex_lock(&monlock)) {
 642                         ast_log(LOG_ERROR, "Unable to grab monitor lock\n");
 643                         return NULL;
 644                 }
 645                 /* Lock the interface list */
 646                 if (pthread_mutex_lock(&iflock)) {
 647                         ast_log(LOG_ERROR, "Unable to grab interface lock\n");
 648                         pthread_mutex_unlock(&monlock);
 649                         return NULL;
 650                 }
 651                 /* Build the stuff we're going to select on, that is the socket of every
 652                    phone_pvt that does not have an associated owner channel */
 653                 n = -1;
 654                 FD_ZERO(&rfds);
 655                 FD_ZERO(&efds);
 656                 i = iflist;
 657                 dotone = 0;
 658                 while(i) {
 659                         if (FD_ISSET(i->fd, &rfds))
 660                                 ast_log(LOG_WARNING, "Descriptor %d appears twice (%s)?\n", i->fd, i->dev);
 661                         if (!i->owner) {
 662                                 /* This needs to be watched, as it lacks an owner */
 663                                 FD_SET(i->fd, &rfds);
 664                                 FD_SET(i->fd, &efds);
 665                                 if (i->fd > n)
 666                                         n = i->fd;
 667                                 if (i->dialtone) {
 668                                         /* Remember we're going to have to come back and play
 669                                            more dialtones */
 670                                         if (!tv.tv_usec && !tv.tv_sec) {
 671                                                 /* If we're due for a dialtone, play one */
 672                                                 if (write(i->fd, DialTone + tonepos, 240) != 240)
 673                                                         ast_log(LOG_WARNING, "Dial tone write error\n");
 674                                         }
 675                                         dotone++;
 676                                 }
 677                         }
 678
 679                         i = i->next;
 680                 }
 681                 /* Okay, now that we know what to do, release the interface lock */
 682                 pthread_mutex_unlock(&iflock);
 683
 684                 /* And from now on, we're okay to be killed, so release the monitor lock as well */
 685                 pthread_mutex_unlock(&monlock);
 686                 /* Wait indefinitely for something to happen */
 687                 if (dotone) {
 688                         /* If we're ready to recycle the time, set it to 30 ms */
 689                         tonepos += 240;
 690                         if (tonepos >= sizeof(DialTone))
 691                                         tonepos = 0;
 692                         if (!tv.tv_usec && !tv.tv_sec) {
 693                                 tv.tv_usec = 30000;
 694                                 tv.tv_sec = 0;
 695                         }
 696                         res = select(n + 1, &rfds, NULL, &efds, &tv);
 697                 } else {
 698                         res = select(n + 1, &rfds, NULL, &efds, NULL);
 699                         tv.tv_usec = 0;
 700                         tv.tv_sec = 0;
 701                         tonepos = 0;
 702                 }
 703                 /* Okay, select has finished.  Let's see what happened.  */
 704                 if (res < 0) {
 705                         ast_log(LOG_WARNING, "select return %d: %s\n", res, strerror(errno));
 706                         continue;
 707                 }
 708                 /* If there are no fd's changed, just continue, it's probably time
 709                    to play some more dialtones */
 710                 if (!res)
 711                         continue;
 712                 /* Alright, lock the interface list again, and let's look and see what has
 713                    happened */
 714                 if (pthread_mutex_lock(&iflock)) {
 715                         ast_log(LOG_WARNING, "Unable to lock the interface list\n");
 716                         continue;
 717                 }
 718                 i = iflist;
 719                 while(i) {
 720                         if (FD_ISSET(i->fd, &rfds)) {
 721                                 if (i->owner) {
 722                                         ast_log(LOG_WARNING, "Whoa....  I'm owned but found (%d, %s)...\n", i->fd, i->dev);
 723                                         continue;
 724                                 }
 725                                 phone_mini_packet(i);
 726                         }
 727                         if (FD_ISSET(i->fd, &efds)) {
 728                                 if (i->owner) {
 729                                         ast_log(LOG_WARNING, "Whoa....  I'm owned but found (%d, %s)...\n", i->fd, i->dev);
 730                                         continue;
 731                                 }
 732                                 phone_check_exception(i);
 733                         }
 734                         i=i->next;
 735                 }
 736                 pthread_mutex_unlock(&iflock);
 737         }
 738         /* Never reached */
 739         return NULL;
 740
 741 }
 742
 743 static int restart_monitor()
 744 {
 745         /* If we're supposed to be stopped -- stay stopped */
 746         if (monitor_thread == -2)
 747                 return 0;
 748         if (pthread_mutex_lock(&monlock)) {
 749                 ast_log(LOG_WARNING, "Unable to lock monitor\n");
 750                 return -1;
 751         }
 752         if (monitor_thread == pthread_self()) {
 753                 pthread_mutex_unlock(&monlock);
 754                 ast_log(LOG_WARNING, "Cannot kill myself\n");
 755                 return -1;
 756         }
 757         if (monitor_thread != -1) {
 758                 pthread_cancel(monitor_thread);
 759 #if 0
 760                 pthread_join(monitor_thread, NULL);
 761 #endif
 762         }
 763         /* Start a new monitor */
 764         if (pthread_create(&monitor_thread, NULL, do_monitor, NULL) < 0) {
 765                 pthread_mutex_unlock(&monlock);
 766                 ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
 767                 return -1;
 768         }
 769         pthread_mutex_unlock(&monlock);
 770         return 0;
 771 }
 772
 773 static struct phone_pvt *mkif(char *iface, int mode)
 774 {
 775         /* Make a phone_pvt structure for this interface */
 776         struct phone_pvt *tmp;
 777 #if 0
 778         int flags;
 779 #endif
 780
 781         tmp = malloc(sizeof(struct phone_pvt));
 782         if (tmp) {
 783                 tmp->fd = open(iface, O_RDWR);
 784                 if (tmp->fd < 0) {
 785                         ast_log(LOG_WARNING, "Unable to open '%s'\n", iface);
 786                         free(tmp);
 787                         return NULL;
 788                 }
 789                 ioctl(tmp->fd, PHONE_PLAY_STOP);
 790                 ioctl(tmp->fd, PHONE_REC_STOP);
 791                 ioctl(tmp->fd, PHONE_RING_STOP);
 792                 ioctl(tmp->fd, PHONE_CPT_STOP);
 793                 ioctl(tmp->fd, PHONE_REC_DEPTH, 4);
 794                 if (echocancel != AEC_OFF)
 795                         ioctl(tmp->fd, IXJCTL_AEC_START, echocancel);
 796                 if (silencesupression)
 797                         tmp->silencesupression = 1;
 798                 ioctl(tmp->fd, PHONE_VAD, tmp->silencesupression);
 799                 tmp->mode = mode;
 800 #if 0
 801                 flags = fcntl(tmp->fd, F_GETFL);
 802                 fcntl(tmp->fd, F_SETFL, flags | O_NONBLOCK);
 803 #endif
 804                 tmp->owner = NULL;
 805                 tmp->lastformat = -1;
 806                 tmp->lastinput = -1;
 807                 tmp->ministate = 0;
 808                 memset(tmp->ext, 0, sizeof(tmp->ext));
 809                 strncpy(tmp->dev, iface, sizeof(tmp->dev));
 810                 strncpy(tmp->context, context, sizeof(tmp->context));
 811                 tmp->next = NULL;
 812                 tmp->obuflen = 0;
 813                 tmp->dialtone = 0;
 814         }
 815         return tmp;
 816 }
 817
 818 static struct ast_channel *phone_request(char *type, int format, void *data)
 819 {
 820         int oldformat;
 821         struct phone_pvt *p;
 822         struct ast_channel *tmp = NULL;
 823         char *name = data;
 824
 825         oldformat = format;
 826         format &= (AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR);
 827         if (!format) {
 828                 ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%d'\n", oldformat);
 829                 return NULL;
 830         }
 831         /* Search for an unowned channel */
 832         if (pthread_mutex_lock(&iflock)) {
 833                 ast_log(LOG_ERROR, "Unable to lock interface list???\n");
 834                 return NULL;
 835         }
 836         p = iflist;
 837         while(p) {
 838                 if (!strcmp(name, p->dev + 5)) {
 839                         if (!p->owner) {
 840                                 tmp = phone_new(p, AST_STATE_DOWN, p->context);
 841                                 break;
 842                         }
 843                 }
 844                 p = p->next;
 845         }
 846         pthread_mutex_unlock(&iflock);
 847         restart_monitor();
 848         return tmp;
 849 }
 850
 851 int load_module()
 852 {
 853         struct ast_config *cfg;
 854         struct ast_variable *v;
 855         struct phone_pvt *tmp;
 856         int mode = MODE_IMMEDIATE;
 857         cfg = ast_load(config);
 858
 859         /* We *must* have a config file otherwise stop immediately */
 860         if (!cfg) {
 861                 ast_log(LOG_ERROR, "Unable to load config %s\n", config);
 862                 return -1;
 863         }
 864         if (pthread_mutex_lock(&iflock)) {
 865                 /* It's a little silly to lock it, but we mind as well just to be sure */
 866                 ast_log(LOG_ERROR, "Unable to lock interface list???\n");
 867                 return -1;
 868         }
 869         v = ast_variable_browse(cfg, "interfaces");
 870         while(v) {
 871                 /* Create the interface list */
 872                 if (!strcasecmp(v->name, "device")) {
 873                                 tmp = mkif(v->value, mode);
 874                                 if (tmp) {
 875                                         tmp->next = iflist;
 876                                         iflist = tmp;
 877
 878                                 } else {
 879                                         ast_log(LOG_ERROR, "Unable to register channel '%s'\n", v->value);
 880                                         ast_destroy(cfg);
 881                                         pthread_mutex_unlock(&iflock);
 882                                         unload_module();
 883                                         return -1;
 884                                 }
 885                 } else if (!strcasecmp(v->name, "silencesupression")) {
 886                         silencesupression = ast_true(v->value);
 887                 } else if (!strcasecmp(v->name, "mode")) {
 888                         if (!strncasecmp(v->value, "di", 2))
 889                                 mode = MODE_DIALTONE;
 890                         else if (!strncasecmp(v->value, "im", 2))
 891                                 mode = MODE_IMMEDIATE;
 892                         else
 893                                 ast_log(LOG_WARNING, "Unknown mode: %s\n", v->value);
 894                 } else if (!strcasecmp(v->name, "context")) {
 895                         strncpy(context, v->value, sizeof(context));
 896                 } else if (!strcasecmp(v->name, "format")) {
 897                         if (!strcasecmp(v->value, "g723.1")) {
 898                                 prefformat = AST_FORMAT_G723_1;
 899                         } else if (!strcasecmp(v->value, "slinear")) {
 900                                 prefformat = AST_FORMAT_SLINEAR;
 901                         } else
 902                                 ast_log(LOG_WARNING, "Unknown format '%s'\n", v->value);
 903                 } else if (!strcasecmp(v->name, "echocancel")) {
 904                         if (!strcasecmp(v->value, "off")) {
 905                                 echocancel = AEC_OFF;
 906                         } else if (!strcasecmp(v->value, "low")) {
 907                                 echocancel = AEC_LOW;
 908                         } else if (!strcasecmp(v->value, "medium")) {
 909                                 echocancel = AEC_MED;
 910                         } else if (!strcasecmp(v->value, "high")) {
 911                                 echocancel = AEC_HIGH;
 912                         } else
 913                                 ast_log(LOG_WARNING, "Unknown echo cancellation '%s'\n", v->value);
 914                 }
 915                 v = v->next;
 916         }
 917         pthread_mutex_unlock(&iflock);
 918         /* Make sure we can register our Adtranphone channel type */
 919         if (ast_channel_register(type, tdesc, AST_FORMAT_G723_1, phone_request)) {
 920                 ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
 921                 ast_destroy(cfg);
 922                 unload_module();
 923                 return -1;
 924         }
 925         ast_destroy(cfg);
 926         /* And start the monitor for the first time */
 927         restart_monitor();
 928         return 0;
 929 }
 930
 931
 932
 933 int unload_module()
 934 {
 935         struct phone_pvt *p, *pl;
 936         /* First, take us out of the channel loop */
 937         ast_channel_unregister(type);
 938         if (!pthread_mutex_lock(&iflock)) {
 939                 /* Hangup all interfaces if they have an owner */
 940                 p = iflist;
 941                 while(p) {
 942                         if (p->owner)
 943                                 ast_softhangup(p->owner);
 944                         p = p->next;
 945                 }
 946                 iflist = NULL;
 947                 pthread_mutex_unlock(&iflock);
 948         } else {
 949                 ast_log(LOG_WARNING, "Unable to lock the monitor\n");
 950                 return -1;
 951         }
 952         if (!pthread_mutex_lock(&monlock)) {
 953                 if (monitor_thread > -1) {
 954                         pthread_cancel(monitor_thread);
 955                         pthread_join(monitor_thread, NULL);
 956                 }
 957                 monitor_thread = -2;
 958                 pthread_mutex_unlock(&monlock);
 959         } else {
 960                 ast_log(LOG_WARNING, "Unable to lock the monitor\n");
 961                 return -1;
 962         }
 963
 964         if (!pthread_mutex_lock(&iflock)) {
 965                 /* Destroy all the interfaces and free their memory */
 966                 p = iflist;
 967                 while(p) {
 968                         /* Close the socket, assuming it's real */
 969                         if (p->fd > -1)
 970                                 close(p->fd);
 971                         pl = p;
 972                         p = p->next;
 973                         /* Free associated memory */
 974                         free(pl);
 975                 }
 976                 iflist = NULL;
 977                 pthread_mutex_unlock(&iflock);
 978         } else {
 979                 ast_log(LOG_WARNING, "Unable to lock the monitor\n");
 980                 return -1;
 981         }
 982
 983         return 0;
 984 }
 985
 986 int usecount()
 987 {
 988         int res;
 989         pthread_mutex_lock(&usecnt_lock);
 990         res = usecnt;
 991         pthread_mutex_unlock(&usecnt_lock);
 992         return res;
 993 }
 994
 995 char *description()
 996 {
 997         return desc;
 998 }
 999