Version 0.1.2 from FTP
authorMark Spencer <markster@digium.com>
Thu, 6 Jan 2000 11:50:20 +0000 (11:50 +0000)
committerMark Spencer <markster@digium.com>
Thu, 6 Jan 2000 11:50:20 +0000 (11:50 +0000)
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@194 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_phone.c [new file with mode: 0755]

diff --git a/channels/chan_phone.c b/channels/chan_phone.c
new file mode 100755 (executable)
index 0000000..26826d2
--- /dev/null
@@ -0,0 +1,999 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * Generic Linux Telephony Interface driver
+ * 
+ * Copyright (C) 1999, Mark Spencer
+ *
+ * Mark Spencer <markster@linux-support.net>
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+
+#include <stdio.h>
+#include <pthread.h>
+#include <string.h>
+#include <asterisk/channel.h>
+#include <asterisk/channel_pvt.h>
+#include <asterisk/config.h>
+#include <asterisk/logger.h>
+#include <asterisk/module.h>
+#include <asterisk/pbx.h>
+#include <asterisk/options.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/telephony.h>
+/* Still use some IXJ specific stuff */
+#include <linux/ixjuser.h>
+#include "DialTone.h"
+
+#define phone_MAX_BUF 480
+
+static char *desc = "Linux Telephony API Support";
+static char *type = "Phone";
+static char *tdesc = "Standard Linux Telephony API Driver";
+static char *config = "phone.conf";
+
+/* Default context for dialtone mode */
+static char context[AST_MAX_EXTENSION] = "default";
+
+static int usecnt =0;
+
+static int echocancel = AEC_OFF;
+
+static int silencesupression = 0;
+
+static int prefformat = AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR;
+
+static pthread_mutex_t usecnt_lock = PTHREAD_MUTEX_INITIALIZER;
+
+/* Protect the interface list (of phone_pvt's) */
+static pthread_mutex_t iflock = PTHREAD_MUTEX_INITIALIZER;
+
+/* Protect the monitoring thread, so only one process can kill or start it, and not
+   when it's doing something critical. */
+static pthread_mutex_t monlock = PTHREAD_MUTEX_INITIALIZER;
+
+/* This is the thread for the monitor which checks for input on the channels
+   which are not currently in use.  */
+static pthread_t monitor_thread = -1;
+
+static int restart_monitor(void);
+
+/* The private structures of the Phone Jack channels are linked for
+   selecting outgoing channels */
+   
+#define MODE_DIALTONE  1
+#define MODE_IMMEDIATE 2
+   
+static struct phone_pvt {
+       int fd;                                                 /* Raw file descriptor for this device */
+       struct ast_channel *owner;              /* Channel we belong to, possibly NULL */
+       int mode;                                               /* Is this in the  */
+       int lastformat;                                 /* Last output format */
+       int lastinput;                                  /* Last input format */
+       int ministate;                                  /* Miniature state, for dialtone mode */
+       char dev[256];                                  /* Device name */
+       struct phone_pvt *next;                 /* Next channel in list */
+       struct ast_frame fr;                    /* Frame */
+       char offset[AST_FRIENDLY_OFFSET];
+       char buf[phone_MAX_BUF];                                        /* Static buffer for reading frames */
+       int obuflen;
+       int dialtone;
+       int silencesupression;
+       char context[AST_MAX_EXTENSION];
+       char obuf[phone_MAX_BUF * 2];
+       char ext[AST_MAX_EXTENSION];
+} *iflist = NULL;
+
+static int phone_digit(struct ast_channel *ast, char digit)
+{
+       struct phone_pvt *p;
+       int outdigit;
+       p = ast->pvt->pvt;
+       switch(digit) {
+       case '0':
+       case '1':
+       case '2':
+       case '3':
+       case '4':
+       case '5':
+       case '6':
+       case '7':
+       case '8':
+       case '9':
+               outdigit = digit - '0' + 1;
+               break;
+       case '*':
+               outdigit = 11;
+               break;
+       case '#':
+               outdigit = 12;
+               break;
+       default:
+               ast_log(LOG_WARNING, "Unknown digit '%c'\n", digit);
+               return -1;
+       }
+       ioctl(p->fd, PHONE_PLAY_TONE, digit);
+       return 0;
+}
+
+static int phone_call(struct ast_channel *ast, char *dest, int timeout)
+{
+       struct phone_pvt *p;
+       p = ast->pvt->pvt;
+       if ((ast->state != AST_STATE_DOWN) && (ast->state != AST_STATE_RESERVED)) {
+               ast_log(LOG_WARNING, "phone_call called on %s, neither down nor reserved\n", ast->name);
+               return -1;
+       }
+       /* When we call, it just works, really, there's no destination...  Just
+          ring the phone and wait for someone to answer */
+       if (option_debug)
+               ast_log(LOG_DEBUG, "Ringing %s on %s (%d)\n", dest, ast->name, ast->fd);
+       ioctl(p->fd, PHONE_RING_START);
+       ast->state = AST_STATE_RINGING;
+       return 0;
+}
+
+static int phone_hangup(struct ast_channel *ast)
+{
+       struct phone_pvt *p;
+       p = ast->pvt->pvt;
+       if (option_debug)
+               ast_log(LOG_DEBUG, "phone_hangup(%s)\n", ast->name);
+       if (!ast->pvt->pvt) {
+               ast_log(LOG_WARNING, "Asked to hangup channel not connected\n");
+               return 0;
+       }
+       /* XXX Is there anything we can do to really hang up except stop recording? */
+       ast->state = AST_STATE_DOWN;
+       if (ioctl(p->fd, PHONE_REC_STOP))
+               ast_log(LOG_WARNING, "Failed to stop recording\n");
+       if (ioctl(p->fd, PHONE_PLAY_STOP))
+               ast_log(LOG_WARNING, "Failed to stop playing\n");
+       if (ioctl(p->fd, PHONE_RING_STOP))
+               ast_log(LOG_WARNING, "Failed to stop ringing\n");
+       if (ioctl(p->fd, PHONE_CPT_STOP))
+               ast_log(LOG_WARNING, "Failed to stop sounds\n");
+       /* If they're off hook, give a busy signal */
+       if (ioctl(p->fd, PHONE_HOOKSTATE)) {
+               if (option_debug)
+                       ast_log(LOG_DEBUG, "Got hunghup, giving busy signal\n");
+               ioctl(p->fd, PHONE_BUSY);
+       }
+       p->lastformat = -1;
+       p->lastinput = -1;
+       p->ministate = 0;
+       p->obuflen = 0;
+       p->dialtone = 0;
+       memset(p->ext, 0, sizeof(p->ext));
+       ((struct phone_pvt *)(ast->pvt->pvt))->owner = NULL;
+       pthread_mutex_lock(&usecnt_lock);
+       usecnt--;
+       if (usecnt < 0) 
+               ast_log(LOG_WARNING, "Usecnt < 0???\n");
+       pthread_mutex_unlock(&usecnt_lock);
+       ast_update_use_count();
+       if (option_verbose > 2) 
+               ast_verbose( VERBOSE_PREFIX_3 "Hungup '%s'\n", ast->name);
+       ast->pvt->pvt = NULL;
+       ast->state = AST_STATE_DOWN;
+       restart_monitor();
+       return 0;
+}
+
+static int phone_setup(struct ast_channel *ast)
+{
+       struct phone_pvt *p;
+       p = ast->pvt->pvt;
+       ioctl(p->fd, PHONE_CPT_STOP);
+       /* Nothing to answering really, just start recording */
+       if (ast->format & AST_FORMAT_G723_1) {
+               /* Prefer g723 */
+               ioctl(p->fd, PHONE_REC_STOP);
+               if (p->lastinput != AST_FORMAT_G723_1) {
+                       p->lastinput = AST_FORMAT_G723_1;
+                       if (ioctl(p->fd, PHONE_REC_CODEC, G723_63)) {
+                               ast_log(LOG_WARNING, "Failed to set codec to g723.1\n");
+                               return -1;
+                       }
+               }
+       } else if (ast->format & AST_FORMAT_SLINEAR) {
+               ioctl(p->fd, PHONE_REC_STOP);
+               if (p->lastinput != AST_FORMAT_SLINEAR) {
+                       p->lastinput = AST_FORMAT_SLINEAR;
+                       if (ioctl(p->fd, PHONE_REC_CODEC, LINEAR16)) {
+                               ast_log(LOG_WARNING, "Failed to set codec to signed linear 16\n");
+                               return -1;
+                       }
+               }
+       } else {
+               ast_log(LOG_WARNING, "Can't do format %d\n", ast->format);
+               return -1;
+       }
+       if (ioctl(p->fd, PHONE_REC_START)) {
+               ast_log(LOG_WARNING, "Failed to start recording\n");
+               return -1;
+       }
+       return 0;
+}
+
+static int phone_answer(struct ast_channel *ast)
+{
+       phone_setup(ast);
+       if (option_debug)
+               ast_log(LOG_DEBUG, "phone_answer(%s)\n", ast->name);
+       ast->rings = 0;
+       ast->state = AST_STATE_UP;
+       return 0;
+}
+
+static char phone_2digit(char c)
+{
+       if (c == 12)
+               return '#';
+       else if (c == 11)
+               return '*';
+       else if ((c < 10) && (c >= 0))
+               return '0' + c - 1;
+       else
+               return '?';
+}
+
+static struct ast_frame  *phone_read(struct ast_channel *ast)
+{
+       int res;
+       union telephony_exception phonee;
+       struct phone_pvt *p = ast->pvt->pvt;
+       char digit;
+
+       /* Some nice norms */
+       p->fr.datalen = 0;
+       p->fr.timelen = 0;
+       p->fr.data =  NULL;
+       p->fr.src = type;
+       p->fr.offset = 0;
+       p->fr.mallocd=0;
+
+       phonee.bytes = ioctl(p->fd, PHONE_EXCEPTION);
+       if (phonee.bits.dtmf_ready)  {
+               /* We've got a digit -- Just handle this nicely and easily */
+               digit =  ioctl(p->fd, PHONE_GET_DTMF_ASCII);
+               p->fr.subclass = digit;
+               p->fr.frametype = AST_FRAME_DTMF;
+               return &p->fr;
+       }
+       if (phonee.bits.hookstate) {
+               res = ioctl(p->fd, PHONE_HOOKSTATE);
+               /* See if we've gone on hook, if so, notify by returning NULL */
+               if (!res)
+                       return NULL;
+               else {
+                       if (ast->state == AST_STATE_RINGING) {
+                               /* They've picked up the phone */
+                               p->fr.frametype = AST_FRAME_CONTROL;
+                               p->fr.subclass = AST_CONTROL_ANSWER;
+                               phone_setup(ast);
+                               ast->state = AST_STATE_UP;
+                               return &p->fr;
+                       }  else 
+                               ast_log(LOG_WARNING, "Got off hook in weird state %d\n", ast->state);
+               }
+       }
+#if 0
+       if (phonee.bits.pstn_ring)
+               ast_verbose("Unit is ringing\n");
+       if (phonee.bits.caller_id) {
+               ast_verbose("We have caller ID: %s\n");
+       }
+#endif
+       /* Try to read some data... */
+       CHECK_BLOCKING(ast);
+       res = read(p->fd, p->buf, phone_MAX_BUF);
+       ast->blocking = 0;
+       if (res < 0) {
+#if 0
+               if (errno == EAGAIN) {
+                       ast_log(LOG_WARNING, "Null frame received\n");
+                       p->fr.frametype = AST_FRAME_NULL;
+                       p->fr.subclass = 0;
+                       return &p->fr;
+               }
+#endif
+               ast_log(LOG_WARNING, "Error reading: %s\n", strerror(errno));
+               return NULL;
+       }
+       p->fr.data = p->buf;
+       switch(p->buf[0] & 0x3) {
+       case '0':
+       case '1':
+               /* Normal */
+               break;
+       case '2':
+       case '3':
+               /* VAD/CNG, only send two words */
+               res = 4;
+               break;
+       }
+       p->fr.datalen = res;
+       p->fr.frametype = AST_FRAME_VOICE;
+       p->fr.subclass = p->lastinput;
+       p->fr.offset = AST_FRIENDLY_OFFSET;
+       return &p->fr;
+}
+
+static int phone_write_buf(struct phone_pvt *p, char *buf, int len, int frlen)
+{
+       int res;
+       /* Store as much of the buffer as we can, then write fixed frames */
+       int space = sizeof(p->obuf) - p->obuflen;
+       /* Make sure we have enough buffer space to store the frame */
+       if (space < len)
+               len = space;
+       memcpy(p->obuf + p->obuflen, buf, len);
+       p->obuflen += len;
+       while(p->obuflen > frlen) {
+#if 0
+               res = frlen;
+               ast_log(LOG_DEBUG, "Wrote %d bytes\n", res);
+#else
+               res = write(p->fd, p->obuf, frlen);
+#endif
+               if (res != frlen) {
+                       if (res < 1) {
+                               ast_log(LOG_WARNING, "Write failed: %s\n", strerror(errno));
+                               return -1;
+                       } else {
+                               ast_log(LOG_WARNING, "Only wrote %d of %d bytes\n", res, frlen);
+                       }
+               }
+               p->obuflen -= frlen;
+               /* Move memory if necessary */
+               if (p->obuflen) 
+                       memmove(p->obuf, p->obuf + frlen, p->obuflen);
+       }
+       return len;
+}
+
+static int phone_write(struct ast_channel *ast, struct ast_frame *frame)
+{
+       struct phone_pvt *p = ast->pvt->pvt;
+       int res;
+       int maxfr=0;
+       char *pos;
+       int sofar;
+       int expected;
+       char tmpbuf[4];
+       /* Write a frame of (presumably voice) data */
+       if (frame->frametype != AST_FRAME_VOICE) {
+               ast_log(LOG_WARNING, "Don't know what to do with  frame type '%d'\n", frame->frametype);
+               ast_frfree(frame);
+               return -1;
+       }
+       if (!(frame->subclass & (AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR))) {
+               ast_log(LOG_WARNING, "Cannot handle frames in %d format\n", frame->subclass);
+               ast_frfree(frame);
+               return -1;
+       }
+       /* If we're not in up mode, go into up mode now */
+       if (ast->state != AST_STATE_UP) {
+               ast->state = AST_STATE_UP;
+               phone_setup(ast);
+       }
+       if (frame->subclass == AST_FORMAT_G723_1) {
+               if (p->lastformat != AST_FORMAT_G723_1) {
+                       ioctl(p->fd, PHONE_PLAY_STOP);
+                       ioctl(p->fd, PHONE_REC_STOP);
+                       if (ioctl(p->fd, PHONE_PLAY_CODEC, G723_63)) {
+                               ast_log(LOG_WARNING, "Unable to set G723.1 mode\n");
+                               return -1;
+                       }
+                       if (ioctl(p->fd, PHONE_REC_CODEC, G723_63)) {
+                               ast_log(LOG_WARNING, "Unable to set G723.1 mode\n");
+                               return -1;
+                       }
+                       p->lastformat = AST_FORMAT_G723_1;
+                       p->lastinput = AST_FORMAT_G723_1;
+                       /* Reset output buffer */
+                       p->obuflen = 0;
+               }
+               if (frame->datalen > 24) {
+                       ast_log(LOG_WARNING, "Frame size too large for G.723.1 (%d bytes)\n", frame->datalen);
+                       return -1;
+               }
+               maxfr = 24;
+       } else if (frame->subclass == AST_FORMAT_SLINEAR) {
+               if (p->lastformat != AST_FORMAT_SLINEAR) {
+                       ioctl(p->fd, PHONE_PLAY_STOP);
+                       ioctl(p->fd, PHONE_REC_STOP);
+                       if (ioctl(p->fd, PHONE_PLAY_CODEC, LINEAR16)) {
+                               ast_log(LOG_WARNING, "Unable to set 16-bit linear mode\n");
+                               return -1;
+                       }
+                       if (ioctl(p->fd, PHONE_REC_CODEC, LINEAR16)) {
+                               ast_log(LOG_WARNING, "Unable to set 16-bit linear mode\n");
+                               return -1;
+                       }
+                       p->lastformat = AST_FORMAT_SLINEAR;
+                       p->lastinput = AST_FORMAT_SLINEAR;
+                       /* Reset output buffer */
+                       p->obuflen = 0;
+               }
+               maxfr = 480;
+       }
+       if (ioctl(p->fd, PHONE_PLAY_START)) {
+               ast_log(LOG_WARNING, "Failed to start playback\n");
+               return -1;
+       }
+       if (ioctl(p->fd, PHONE_REC_START)) {
+               ast_log(LOG_WARNING, "Failed to start recording\n");
+               return -1;
+       }
+       /* If we get here, we have a voice frame of Appropriate data */
+       sofar = 0;
+       pos = frame->data;
+       while(sofar < frame->datalen) {
+               /* Write in no more than maxfr sized frames */
+               expected = frame->datalen - sofar;
+               if (maxfr < expected)
+                       expected = maxfr;
+               /* XXX Internet Phone Jack does not handle the 4-byte VAD frame properly! XXX 
+                  we have to pad it to 24 bytes still.  */
+               if (frame->datalen == 4) {
+                       if (p->silencesupression) {
+                               memset(tmpbuf + 4, 0, sizeof(tmpbuf) - 4);
+                               memcpy(tmpbuf, frame->data, 4);
+                               expected = 24;
+                               res = phone_write_buf(p, tmpbuf, expected, maxfr);
+                       }
+                       res = 4;
+                       expected=4;
+               } else {
+                       res = phone_write_buf(p, pos, expected, maxfr);
+               }
+               if (res != expected) {
+                       if (res < 0) 
+                               ast_log(LOG_WARNING, "Write returned error (%s)\n", strerror(errno));
+                       else
+                               ast_log(LOG_WARNING, "Only wrote %d of %d bytes\n", res, frame->datalen);
+                       return -1;
+               }
+               sofar += res;
+               pos += res;
+       }
+       return 0;
+}
+
+static struct ast_channel *phone_new(struct phone_pvt *i, int state, char *context)
+{
+       struct ast_channel *tmp;
+       tmp = ast_channel_alloc();
+       if (tmp) {
+               snprintf(tmp->name, sizeof(tmp->name), "Phone/%s", i->dev + 5);
+               tmp->type = type;
+               tmp->fd = i->fd;
+               /* XXX Switching formats silently causes kernel panics XXX */
+               tmp->format = prefformat;
+               tmp->state = state;
+               if (state == AST_STATE_RING)
+                       tmp->rings = 1;
+               tmp->pvt->pvt = i;
+               tmp->pvt->send_digit = phone_digit;
+               tmp->pvt->call = phone_call;
+               tmp->pvt->hangup = phone_hangup;
+               tmp->pvt->answer = phone_answer;
+               tmp->pvt->read = phone_read;
+               tmp->pvt->write = phone_write;
+               strncpy(tmp->context, context, sizeof(tmp->context));
+               if (strlen(i->ext))
+                       strncpy(tmp->exten, i->ext, sizeof(tmp->exten));
+               i->owner = tmp;
+               pthread_mutex_lock(&usecnt_lock);
+               usecnt++;
+               pthread_mutex_unlock(&usecnt_lock);
+               ast_update_use_count();
+               if (state != AST_STATE_DOWN) {
+                       if (state == AST_STATE_RING) {
+                               ioctl(tmp->fd, PHONE_RINGBACK);
+                       }
+                       if (ast_pbx_start(tmp)) {
+                               ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
+                               ast_hangup(tmp);
+                       }
+               }
+       } else
+               ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
+       return tmp;
+}
+
+static void phone_mini_packet(struct phone_pvt *i)
+{
+       int res;
+       char buf[1024];
+       /* Ignore stuff we read... */
+       res = read(i->fd, buf, sizeof(buf));
+       if (res < 1) {
+               ast_log(LOG_WARNING, "Read returned %d\n", res);
+               return;
+       }
+}
+
+static void phone_check_exception(struct phone_pvt *i)
+{
+       int offhook=0;
+       char digit[2] = {0 , 0};
+       union telephony_exception phonee;
+       /* XXX Do something XXX */
+#if 0
+       ast_log(LOG_DEBUG, "Exception!\n");
+#endif
+       phonee.bytes = ioctl(i->fd, PHONE_EXCEPTION);
+       if (phonee.bits.dtmf_ready)  {
+               digit[0] = ioctl(i->fd, PHONE_GET_DTMF_ASCII);
+               if (i->mode == MODE_DIALTONE) {
+                       ioctl(i->fd, PHONE_PLAY_STOP);
+                       ioctl(i->fd, PHONE_REC_STOP);
+                       ioctl(i->fd, PHONE_CPT_STOP);
+                       i->dialtone = 0;
+                       if (strlen(i->ext) < AST_MAX_EXTENSION - 1)
+                               strcat(i->ext, digit);
+                       if (ast_exists_extension(NULL, i->context, i->ext, 1)) {
+                               /* It's a valid extension in its context, get moving! */
+                               phone_new(i, AST_STATE_RING, i->context);
+                               /* No need to restart monitor, we are the monitor */
+                               if (i->owner) {
+                                       pthread_mutex_lock(&usecnt_lock);
+                                       usecnt--;
+                                       pthread_mutex_unlock(&usecnt_lock);
+                                       ast_update_use_count();
+                               }
+                       } else if (!ast_canmatch_extension(NULL, i->context, i->ext, 1)) {
+                               /* There is nothing in the specified extension that can match anymore.
+                                  Try the default */
+                               if (ast_exists_extension(NULL, "default", i->ext, 1)) {
+                                       /* Check the default, too... */
+                                       phone_new(i, AST_STATE_RING, "default");
+                                       if (i->owner) {
+                                               pthread_mutex_lock(&usecnt_lock);
+                                               usecnt--;
+                                               pthread_mutex_unlock(&usecnt_lock);
+                                               ast_update_use_count();
+                                       }
+                                       /* XXX This should probably be justified better XXX */
+                               }  else if (!ast_canmatch_extension(NULL, "default", i->ext, 1)) {
+                                       /* It's not a valid extension, give a busy signal */
+                                       if (option_debug)
+                                               ast_log(LOG_DEBUG, "%s can't match anything in %s or default\n", i->ext, i->context);
+                                       ioctl(i->fd, PHONE_BUSY);
+                               }
+                       }
+#if 0
+                       ast_verbose("Extension is %s\n", i->ext);
+#endif
+               }
+       }
+       if (phonee.bits.hookstate) {
+               offhook = ioctl(i->fd, PHONE_HOOKSTATE);
+               if (offhook) {
+                       if (i->mode == MODE_IMMEDIATE) {
+                               phone_new(i, AST_STATE_RING, i->context);
+                       } else if (i->mode == MODE_DIALTONE) {
+                               pthread_mutex_lock(&usecnt_lock);
+                               usecnt++;
+                               pthread_mutex_unlock(&usecnt_lock);
+                               ast_update_use_count();
+                               /* Reset the extension */
+                               i->ext[0] = '\0';
+                               /* Play the dialtone */
+                               i->dialtone++;
+                               ioctl(i->fd, PHONE_PLAY_STOP);
+                               ioctl(i->fd, PHONE_PLAY_CODEC, ULAW);
+                               ioctl(i->fd, PHONE_PLAY_START);
+                       }
+               } else {
+                       if (i->dialtone) {
+                               pthread_mutex_lock(&usecnt_lock);
+                               usecnt--;
+                               pthread_mutex_unlock(&usecnt_lock);
+                               ast_update_use_count();
+                       }
+                       memset(i->ext, 0, sizeof(i->ext));
+                       ioctl(i->fd, PHONE_CPT_STOP);
+                       ioctl(i->fd, PHONE_PLAY_STOP);
+                       ioctl(i->fd, PHONE_REC_STOP);
+                       i->dialtone = 0;
+               }
+       }
+       if (phonee.bits.pstn_ring)
+               ast_verbose("Unit is ringing\n");
+       if (phonee.bits.caller_id)
+               ast_verbose("We have caller ID\n");
+       
+       
+}
+
+static void *do_monitor(void *data)
+{
+       fd_set rfds, efds;
+       int n, res;
+       struct phone_pvt *i;
+       int tonepos = 0;
+       /* The tone we're playing this round */
+       struct timeval tv = {0,0};
+       int dotone;
+       /* This thread monitors all the frame relay interfaces which are not yet in use
+          (and thus do not have a separate thread) indefinitely */
+       /* From here on out, we die whenever asked */
+       if (pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL)) {
+               ast_log(LOG_WARNING, "Unable to set cancel type to asynchronous\n");
+               return NULL;
+       }
+       for(;;) {
+               /* Don't let anybody kill us right away.  Nobody should lock the interface list
+                  and wait for the monitor list, but the other way around is okay. */
+               if (pthread_mutex_lock(&monlock)) {
+                       ast_log(LOG_ERROR, "Unable to grab monitor lock\n");
+                       return NULL;
+               }
+               /* Lock the interface list */
+               if (pthread_mutex_lock(&iflock)) {
+                       ast_log(LOG_ERROR, "Unable to grab interface lock\n");
+                       pthread_mutex_unlock(&monlock);
+                       return NULL;
+               }
+               /* Build the stuff we're going to select on, that is the socket of every
+                  phone_pvt that does not have an associated owner channel */
+               n = -1;
+               FD_ZERO(&rfds);
+               FD_ZERO(&efds);
+               i = iflist;
+               dotone = 0;
+               while(i) {
+                       if (FD_ISSET(i->fd, &rfds)) 
+                               ast_log(LOG_WARNING, "Descriptor %d appears twice (%s)?\n", i->fd, i->dev);
+                       if (!i->owner) {
+                               /* This needs to be watched, as it lacks an owner */
+                               FD_SET(i->fd, &rfds);
+                               FD_SET(i->fd, &efds);
+                               if (i->fd > n)
+                                       n = i->fd;
+                               if (i->dialtone) {
+                                       /* Remember we're going to have to come back and play
+                                          more dialtones */
+                                       if (!tv.tv_usec && !tv.tv_sec) {
+                                               /* If we're due for a dialtone, play one */
+                                               if (write(i->fd, DialTone + tonepos, 240) != 240)
+                                                       ast_log(LOG_WARNING, "Dial tone write error\n");
+                                       }
+                                       dotone++;
+                               }
+                       }
+                       
+                       i = i->next;
+               }
+               /* Okay, now that we know what to do, release the interface lock */
+               pthread_mutex_unlock(&iflock);
+               
+               /* And from now on, we're okay to be killed, so release the monitor lock as well */
+               pthread_mutex_unlock(&monlock);
+               /* Wait indefinitely for something to happen */
+               if (dotone) {
+                       /* If we're ready to recycle the time, set it to 30 ms */
+                       tonepos += 240;
+                       if (tonepos >= sizeof(DialTone))
+                                       tonepos = 0;
+                       if (!tv.tv_usec && !tv.tv_sec) {
+                               tv.tv_usec = 30000;
+                               tv.tv_sec = 0;
+                       }
+                       res = select(n + 1, &rfds, NULL, &efds, &tv);
+               } else {
+                       res = select(n + 1, &rfds, NULL, &efds, NULL);
+                       tv.tv_usec = 0;
+                       tv.tv_sec = 0;
+                       tonepos = 0;
+               }
+               /* Okay, select has finished.  Let's see what happened.  */
+               if (res < 0) {
+                       ast_log(LOG_WARNING, "select return %d: %s\n", res, strerror(errno));
+                       continue;
+               }
+               /* If there are no fd's changed, just continue, it's probably time
+                  to play some more dialtones */
+               if (!res)
+                       continue;
+               /* Alright, lock the interface list again, and let's look and see what has
+                  happened */
+               if (pthread_mutex_lock(&iflock)) {
+                       ast_log(LOG_WARNING, "Unable to lock the interface list\n");
+                       continue;
+               }
+               i = iflist;
+               while(i) {
+                       if (FD_ISSET(i->fd, &rfds)) {
+                               if (i->owner) {
+                                       ast_log(LOG_WARNING, "Whoa....  I'm owned but found (%d, %s)...\n", i->fd, i->dev);
+                                       continue;
+                               }
+                               phone_mini_packet(i);
+                       }
+                       if (FD_ISSET(i->fd, &efds)) {
+                               if (i->owner) {
+                                       ast_log(LOG_WARNING, "Whoa....  I'm owned but found (%d, %s)...\n", i->fd, i->dev);
+                                       continue;
+                               }
+                               phone_check_exception(i);
+                       }
+                       i=i->next;
+               }
+               pthread_mutex_unlock(&iflock);
+       }
+       /* Never reached */
+       return NULL;
+       
+}
+
+static int restart_monitor()
+{
+       /* If we're supposed to be stopped -- stay stopped */
+       if (monitor_thread == -2)
+               return 0;
+       if (pthread_mutex_lock(&monlock)) {
+               ast_log(LOG_WARNING, "Unable to lock monitor\n");
+               return -1;
+       }
+       if (monitor_thread == pthread_self()) {
+               pthread_mutex_unlock(&monlock);
+               ast_log(LOG_WARNING, "Cannot kill myself\n");
+               return -1;
+       }
+       if (monitor_thread != -1) {
+               pthread_cancel(monitor_thread);
+#if 0
+               pthread_join(monitor_thread, NULL);
+#endif
+       }
+       /* Start a new monitor */
+       if (pthread_create(&monitor_thread, NULL, do_monitor, NULL) < 0) {
+               pthread_mutex_unlock(&monlock);
+               ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
+               return -1;
+       }
+       pthread_mutex_unlock(&monlock);
+       return 0;
+}
+
+static struct phone_pvt *mkif(char *iface, int mode)
+{
+       /* Make a phone_pvt structure for this interface */
+       struct phone_pvt *tmp;
+#if 0
+       int flags;      
+#endif
+       
+       tmp = malloc(sizeof(struct phone_pvt));
+       if (tmp) {
+               tmp->fd = open(iface, O_RDWR);
+               if (tmp->fd < 0) {
+                       ast_log(LOG_WARNING, "Unable to open '%s'\n", iface);
+                       free(tmp);
+                       return NULL;
+               }
+               ioctl(tmp->fd, PHONE_PLAY_STOP);
+               ioctl(tmp->fd, PHONE_REC_STOP);
+               ioctl(tmp->fd, PHONE_RING_STOP);
+               ioctl(tmp->fd, PHONE_CPT_STOP);
+               ioctl(tmp->fd, PHONE_REC_DEPTH, 4);
+               if (echocancel != AEC_OFF)
+                       ioctl(tmp->fd, IXJCTL_AEC_START, echocancel);
+               if (silencesupression) 
+                       tmp->silencesupression = 1;
+               ioctl(tmp->fd, PHONE_VAD, tmp->silencesupression);
+               tmp->mode = mode;
+#if 0
+               flags = fcntl(tmp->fd, F_GETFL);
+               fcntl(tmp->fd, F_SETFL, flags | O_NONBLOCK);
+#endif
+               tmp->owner = NULL;
+               tmp->lastformat = -1;
+               tmp->lastinput = -1;
+               tmp->ministate = 0;
+               memset(tmp->ext, 0, sizeof(tmp->ext));
+               strncpy(tmp->dev, iface, sizeof(tmp->dev));
+               strncpy(tmp->context, context, sizeof(tmp->context));
+               tmp->next = NULL;
+               tmp->obuflen = 0;
+               tmp->dialtone = 0;
+       }
+       return tmp;
+}
+
+static struct ast_channel *phone_request(char *type, int format, void *data)
+{
+       int oldformat;
+       struct phone_pvt *p;
+       struct ast_channel *tmp = NULL;
+       char *name = data;
+       
+       oldformat = format;
+       format &= (AST_FORMAT_G723_1 | AST_FORMAT_SLINEAR);
+       if (!format) {
+               ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%d'\n", oldformat);
+               return NULL;
+       }
+       /* Search for an unowned channel */
+       if (pthread_mutex_lock(&iflock)) {
+               ast_log(LOG_ERROR, "Unable to lock interface list???\n");
+               return NULL;
+       }
+       p = iflist;
+       while(p) {
+               if (!strcmp(name, p->dev + 5)) {
+                       if (!p->owner) {
+                               tmp = phone_new(p, AST_STATE_DOWN, p->context);
+                               break;
+                       }
+               }
+               p = p->next;
+       }
+       pthread_mutex_unlock(&iflock);
+       restart_monitor();
+       return tmp;
+}
+
+int load_module()
+{
+       struct ast_config *cfg;
+       struct ast_variable *v;
+       struct phone_pvt *tmp;
+       int mode = MODE_IMMEDIATE;
+       cfg = ast_load(config);
+
+       /* We *must* have a config file otherwise stop immediately */
+       if (!cfg) {
+               ast_log(LOG_ERROR, "Unable to load config %s\n", config);
+               return -1;
+       }
+       if (pthread_mutex_lock(&iflock)) {
+               /* It's a little silly to lock it, but we mind as well just to be sure */
+               ast_log(LOG_ERROR, "Unable to lock interface list???\n");
+               return -1;
+       }
+       v = ast_variable_browse(cfg, "interfaces");
+       while(v) {
+               /* Create the interface list */
+               if (!strcasecmp(v->name, "device")) {
+                               tmp = mkif(v->value, mode);
+                               if (tmp) {
+                                       tmp->next = iflist;
+                                       iflist = tmp;
+                                       
+                               } else {
+                                       ast_log(LOG_ERROR, "Unable to register channel '%s'\n", v->value);
+                                       ast_destroy(cfg);
+                                       pthread_mutex_unlock(&iflock);
+                                       unload_module();
+                                       return -1;
+                               }
+               } else if (!strcasecmp(v->name, "silencesupression")) {
+                       silencesupression = ast_true(v->value);
+               } else if (!strcasecmp(v->name, "mode")) {
+                       if (!strncasecmp(v->value, "di", 2)) 
+                               mode = MODE_DIALTONE;
+                       else if (!strncasecmp(v->value, "im", 2))
+                               mode = MODE_IMMEDIATE;
+                       else
+                               ast_log(LOG_WARNING, "Unknown mode: %s\n", v->value);
+               } else if (!strcasecmp(v->name, "context")) {
+                       strncpy(context, v->value, sizeof(context));
+               } else if (!strcasecmp(v->name, "format")) {
+                       if (!strcasecmp(v->value, "g723.1")) {
+                               prefformat = AST_FORMAT_G723_1;
+                       } else if (!strcasecmp(v->value, "slinear")) {
+                               prefformat = AST_FORMAT_SLINEAR;
+                       } else 
+                               ast_log(LOG_WARNING, "Unknown format '%s'\n", v->value);
+               } else if (!strcasecmp(v->name, "echocancel")) {
+                       if (!strcasecmp(v->value, "off")) {
+                               echocancel = AEC_OFF;
+                       } else if (!strcasecmp(v->value, "low")) {
+                               echocancel = AEC_LOW;
+                       } else if (!strcasecmp(v->value, "medium")) {
+                               echocancel = AEC_MED;
+                       } else if (!strcasecmp(v->value, "high")) {
+                               echocancel = AEC_HIGH;
+                       } else 
+                               ast_log(LOG_WARNING, "Unknown echo cancellation '%s'\n", v->value);
+               }
+               v = v->next;
+       }
+       pthread_mutex_unlock(&iflock);
+       /* Make sure we can register our Adtranphone channel type */
+       if (ast_channel_register(type, tdesc, AST_FORMAT_G723_1, phone_request)) {
+               ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
+               ast_destroy(cfg);
+               unload_module();
+               return -1;
+       }
+       ast_destroy(cfg);
+       /* And start the monitor for the first time */
+       restart_monitor();
+       return 0;
+}
+
+
+
+int unload_module()
+{
+       struct phone_pvt *p, *pl;
+       /* First, take us out of the channel loop */
+       ast_channel_unregister(type);
+       if (!pthread_mutex_lock(&iflock)) {
+               /* Hangup all interfaces if they have an owner */
+               p = iflist;
+               while(p) {
+                       if (p->owner)
+                               ast_softhangup(p->owner);
+                       p = p->next;
+               }
+               iflist = NULL;
+               pthread_mutex_unlock(&iflock);
+       } else {
+               ast_log(LOG_WARNING, "Unable to lock the monitor\n");
+               return -1;
+       }
+       if (!pthread_mutex_lock(&monlock)) {
+               if (monitor_thread > -1) {
+                       pthread_cancel(monitor_thread);
+                       pthread_join(monitor_thread, NULL);
+               }
+               monitor_thread = -2;
+               pthread_mutex_unlock(&monlock);
+       } else {
+               ast_log(LOG_WARNING, "Unable to lock the monitor\n");
+               return -1;
+       }
+
+       if (!pthread_mutex_lock(&iflock)) {
+               /* Destroy all the interfaces and free their memory */
+               p = iflist;
+               while(p) {
+                       /* Close the socket, assuming it's real */
+                       if (p->fd > -1)
+                               close(p->fd);
+                       pl = p;
+                       p = p->next;
+                       /* Free associated memory */
+                       free(pl);
+               }
+               iflist = NULL;
+               pthread_mutex_unlock(&iflock);
+       } else {
+               ast_log(LOG_WARNING, "Unable to lock the monitor\n");
+               return -1;
+       }
+               
+       return 0;
+}
+
+int usecount()
+{
+       int res;
+       pthread_mutex_lock(&usecnt_lock);
+       res = usecnt;
+       pthread_mutex_unlock(&usecnt_lock);
+       return res;
+}
+
+char *description()
+{
+       return desc;
+}
+