chan_phone.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <[email protected]>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Generic Linux Telephony Interface driver
 *
 * \author Mark Spencer <[email protected]>
 *
 * \ingroup channel_drivers
 */

/*! \li \ref chan_phone.c uses the configuration file \ref phone.conf
 * \addtogroup configuration_file
 */

/*! \page phone.conf phone.conf
 * \verbinclude phone.conf.sample
 */

/*** MODULEINFO
 <depend>ixjuser</depend>
 <support_level>deprecated</support_level>
 ***/

#include "asterisk.h"

#include <ctype.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <signal.h>
#ifdef HAVE_LINUX_COMPILER_H
#include <linux/compiler.h>
#endif
#include <linux/telephony.h>
/* Still use some IXJ specific stuff */
#include <linux/version.h>
#include <linux/ixjuser.h>

#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/utils.h"
#include "asterisk/callerid.h"
#include "asterisk/causes.h"
#include "asterisk/stringfields.h"
#include "asterisk/musiconhold.h"
#include "asterisk/format_cache.h"
#include "asterisk/format_compatibility.h"

#include "chan_phone.h"

#ifdef QTI_PHONEJACK_TJ_PCI /* check for the newer quicknet driver v.3.1.0 which has this symbol */
#define QNDRV_VER 310
#else
#define QNDRV_VER 100
#endif

#if QNDRV_VER > 100
#ifdef __linux__
#define IXJ_PHONE_RING_START(x) ioctl(p->fd, PHONE_RING_START, &x);
#else /* FreeBSD and others */
#define IXJ_PHONE_RING_START(x) ioctl(p->fd, PHONE_RING_START, x);
#endif /* __linux__ */
#else /* older driver */
#define IXJ_PHONE_RING_START(x) ioctl(p->fd, PHONE_RING_START, &x);
#endif

#define DEFAULT_CALLER_ID "Unknown"
#define PHONE_MAX_BUF 480
#define DEFAULT_GAIN 0x100

static const char tdesc[] = "Standard Linux Telephony API Driver";
static const char config[] = "phone.conf";

/* Default context for dialtone mode */
static char context[AST_MAX_EXTENSION] = "default";

/* Default language */
static char language[MAX_LANGUAGE] = "";

static int echocancel = AEC_OFF;

static int silencesupression = 0;

static struct ast_format_cap *prefcap;

/* Protect the interface list (of phone_pvt's) */
AST_MUTEX_DEFINE_STATIC(iflock);

/* Protect the monitoring thread, so only one process can kill or start it, and not
 when it's doing something critical. */
AST_MUTEX_DEFINE_STATIC(monlock);

/* Boolean value whether the monitoring thread shall continue. */
static unsigned int monitor;

/* 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 = AST_PTHREADT_NULL;

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
#define MODE_FXO 3
#define MODE_FXS 4
#define MODE_SIGMA 5

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 */
 struct ast_format *lastformat; /* Last output format */
 struct ast_format *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 txgain, rxgain; /* gain control for playing, recording */
 /* 0x100 - 1.0, 0x200 - 2.0, 0x80 - 0.5 */
 int cpt; /* Call Progress Tone playing? */
 int silencesupression;
 char context[AST_MAX_EXTENSION];
 char obuf[PHONE_MAX_BUF * 2];
 char ext[AST_MAX_EXTENSION];
 char language[MAX_LANGUAGE];
 char cid_num[AST_MAX_EXTENSION];
 char cid_name[AST_MAX_EXTENSION];
} *iflist = NULL;

static char cid_num[AST_MAX_EXTENSION];
static char cid_name[AST_MAX_EXTENSION];

static struct ast_channel *phone_request(const char *type, struct ast_format_cap *cap, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause);
static int phone_digit_begin(struct ast_channel *ast, char digit);
static int phone_digit_end(struct ast_channel *ast, char digit, unsigned int duration);
static int phone_call(struct ast_channel *ast, const char *dest, int timeout);
static int phone_hangup(struct ast_channel *ast);
static int phone_answer(struct ast_channel *ast);
static struct ast_frame *phone_read(struct ast_channel *ast);
static int phone_write(struct ast_channel *ast, struct ast_frame *frame);
static struct ast_frame *phone_exception(struct ast_channel *ast);
static int phone_send_text(struct ast_channel *ast, const char *text);
static int phone_fixup(struct ast_channel *old, struct ast_channel *new);
static int phone_indicate(struct ast_channel *chan, int condition, const void *data, size_t datalen);

static struct ast_channel_tech phone_tech = {
 .type = "Phone",
 .description = tdesc,
 .requester = phone_request,
 .send_digit_begin = phone_digit_begin,
 .send_digit_end = phone_digit_end,
 .call = phone_call,
 .hangup = phone_hangup,
 .answer = phone_answer,
 .read = phone_read,
 .write = phone_write,
 .exception = phone_exception,
 .indicate = phone_indicate,
 .fixup = phone_fixup
};

static struct ast_channel_tech phone_tech_fxs = {
 .type = "Phone",
 .description = tdesc,
 .requester = phone_request,
 .send_digit_begin = phone_digit_begin,
 .send_digit_end = phone_digit_end,
 .call = phone_call,
 .hangup = phone_hangup,
 .answer = phone_answer,
 .read = phone_read,
 .write = phone_write,
 .exception = phone_exception,
 .write_video = phone_write,
 .send_text = phone_send_text,
 .indicate = phone_indicate,
 .fixup = phone_fixup
};

static struct ast_channel_tech *cur_tech;

static int phone_indicate(struct ast_channel *chan, int condition, const void *data, size_t datalen)
{
 struct phone_pvt *p = ast_channel_tech_pvt(chan);
 int res=-1;
 ast_debug(1, "Requested indication %d on channel %s\n", condition, ast_channel_name(chan));
 switch(condition) {
 case AST_CONTROL_FLASH:
 ioctl(p->fd, IXJCTL_PSTN_SET_STATE, PSTN_ON_HOOK);
 usleep(320000);
 ioctl(p->fd, IXJCTL_PSTN_SET_STATE, PSTN_OFF_HOOK);
 ao2_cleanup(p->lastformat);
 p->lastformat = NULL;
 res = 0;
 break;
 case AST_CONTROL_HOLD:
 ast_moh_start(chan, data, NULL);
 break;
 case AST_CONTROL_UNHOLD:
 ast_moh_stop(chan);
 break;
 case AST_CONTROL_SRCUPDATE:
 res = 0;
 break;
 case AST_CONTROL_PVT_CAUSE_CODE:
 break;
 default:
 ast_log(LOG_WARNING, "Condition %d is not supported on channel %s\n", condition, ast_channel_name(chan));
 }
 return res;
}

static int phone_fixup(struct ast_channel *old, struct ast_channel *new)
{
 struct phone_pvt *pvt = ast_channel_tech_pvt(old);
 if (pvt && pvt->owner == old)
 pvt->owner = new;
 return 0;
}

static int phone_digit_begin(struct ast_channel *chan, char digit)
{
 /* XXX Modify this callback to let Asterisk support controlling the length of DTMF */
 return 0;
}

static int phone_digit_end(struct ast_channel *ast, char digit, unsigned int duration)
{
 struct phone_pvt *p;
 int outdigit;
 p = ast_channel_tech_pvt(ast);
 ast_debug(1, "Dialed %c\n", digit);
 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';
 break;
 case '*':
 outdigit = 11;
 break;
 case '#':
 outdigit = 12;
 break;
 case 'f': /*flash*/
 case 'F':
 ioctl(p->fd, IXJCTL_PSTN_SET_STATE, PSTN_ON_HOOK);
 usleep(320000);
 ioctl(p->fd, IXJCTL_PSTN_SET_STATE, PSTN_OFF_HOOK);
 ao2_cleanup(p->lastformat);
 p->lastformat = NULL;
 return 0;
 default:
 ast_log(LOG_WARNING, "Unknown digit '%c'\n", digit);
 return -1;
 }
 ast_debug(1, "Dialed %d\n", outdigit);
 ioctl(p->fd, PHONE_PLAY_TONE, outdigit);
 ao2_cleanup(p->lastformat);
 p->lastformat = NULL;
 return 0;
}

static int phone_call(struct ast_channel *ast, const char *dest, int timeout)
{
 struct phone_pvt *p;

 PHONE_CID cid;
 struct timeval UtcTime = ast_tvnow();
 struct ast_tm tm;
 int start;

 ast_localtime(&UtcTime, &tm, NULL);

 memset(&cid, 0, sizeof(PHONE_CID));
 snprintf(cid.month, sizeof(cid.month), "%02d",(tm.tm_mon + 1));
 snprintf(cid.day, sizeof(cid.day), "%02d", tm.tm_mday);
 snprintf(cid.hour, sizeof(cid.hour), "%02d", tm.tm_hour);
 snprintf(cid.min, sizeof(cid.min), "%02d", tm.tm_min);
 /* the standard format of ast->callerid is: "name" <number>, but not always complete */
 if (!ast_channel_connected(ast)->id.name.valid
 || ast_strlen_zero(ast_channel_connected(ast)->id.name.str)) {
 strcpy(cid.name, DEFAULT_CALLER_ID);
 } else {
 ast_copy_string(cid.name, ast_channel_connected(ast)->id.name.str, sizeof(cid.name));
 }

 if (ast_channel_connected(ast)->id.number.valid && ast_channel_connected(ast)->id.number.str) {
 ast_copy_string(cid.number, ast_channel_connected(ast)->id.number.str, sizeof(cid.number));
 }

 p = ast_channel_tech_pvt(ast);

 if ((ast_channel_state(ast) != AST_STATE_DOWN) && (ast_channel_state(ast) != AST_STATE_RESERVED)) {
 ast_log(LOG_WARNING, "phone_call called on %s, neither down nor reserved\n", ast_channel_name(ast));
 return -1;
 }
 ast_debug(1, "Ringing %s on %s (%d)\n", dest, ast_channel_name(ast), ast_channel_fd(ast, 0));

 start = IXJ_PHONE_RING_START(cid);
 if (start == -1)
 return -1;

 if (p->mode == MODE_FXS) {
 const char *digit = strchr(dest, '/');
 if (digit)
 {
 digit++;
 while (*digit)
 phone_digit_end(ast, *digit++, 0);
 }
 }

 ast_setstate(ast, AST_STATE_RINGING);
 ast_queue_control(ast, AST_CONTROL_RINGING);
 return 0;
}

static int phone_hangup(struct ast_channel *ast)
{
 struct phone_pvt *p;
 p = ast_channel_tech_pvt(ast);
 ast_debug(1, "phone_hangup(%s)\n", ast_channel_name(ast));
 if (!ast_channel_tech_pvt(ast)) {
 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_setstate(ast, 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 it's an FXO, hang them up */
 if (p->mode == MODE_FXO) {
 if (ioctl(p->fd, PHONE_PSTN_SET_STATE, PSTN_ON_HOOK))
 ast_debug(1, "ioctl(PHONE_PSTN_SET_STATE) failed on %s (%s)\n",ast_channel_name(ast), strerror(errno));
 }

 /* If they're off hook, give a busy signal */
 if (ioctl(p->fd, PHONE_HOOKSTATE)) {
 ast_debug(1, "Got hunghup, giving busy signal\n");
 ioctl(p->fd, PHONE_BUSY);
 p->cpt = 1;
 }
 ao2_cleanup(p->lastformat);
 p->lastformat = NULL;
 ao2_cleanup(p->lastinput);
 p->lastinput = NULL;
 p->ministate = 0;
 p->obuflen = 0;
 p->dialtone = 0;
 memset(p->ext, 0, sizeof(p->ext));
 ((struct phone_pvt *)(ast_channel_tech_pvt(ast)))->owner = NULL;
 ast_module_unref(ast_module_info->self);
 ast_verb(3, "Hungup '%s'\n", ast_channel_name(ast));
 ast_channel_tech_pvt_set(ast, NULL);
 ast_setstate(ast, AST_STATE_DOWN);
 restart_monitor();
 return 0;
}

static int phone_setup(struct ast_channel *ast)
{
 struct phone_pvt *p;
 p = ast_channel_tech_pvt(ast);
 ioctl(p->fd, PHONE_CPT_STOP);
 /* Nothing to answering really, just start recording */
 if (ast_format_cmp(ast_channel_rawreadformat(ast), ast_format_g729) == AST_FORMAT_CMP_EQUAL) {
 /* Prefer g729 */
 ioctl(p->fd, PHONE_REC_STOP);
 if (!p->lastinput || (ast_format_cmp(p->lastinput, ast_format_g729) != AST_FORMAT_CMP_EQUAL)) {
 ao2_replace(p->lastinput, ast_format_g729);
 if (ioctl(p->fd, PHONE_REC_CODEC, G729)) {
 ast_log(LOG_WARNING, "Failed to set codec to g729\n");
 return -1;
 }
 }
 } else if (ast_format_cmp(ast_channel_rawreadformat(ast), ast_format_g723) == AST_FORMAT_CMP_EQUAL) {
 ioctl(p->fd, PHONE_REC_STOP);
 if (!p->lastinput || (ast_format_cmp(p->lastinput, ast_format_g723) != AST_FORMAT_CMP_EQUAL)) {
 ao2_replace(p->lastinput, ast_format_g723);
 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_cmp(ast_channel_rawreadformat(ast), ast_format_slin) == AST_FORMAT_CMP_EQUAL) {
 ioctl(p->fd, PHONE_REC_STOP);
 if (!p->lastinput || (ast_format_cmp(p->lastinput, ast_format_slin) != AST_FORMAT_CMP_EQUAL)) {
 ao2_replace(p->lastinput, ast_format_slin);
 if (ioctl(p->fd, PHONE_REC_CODEC, LINEAR16)) {
 ast_log(LOG_WARNING, "Failed to set codec to signed linear 16\n");
 return -1;
 }
 }
 } else if (ast_format_cmp(ast_channel_rawreadformat(ast), ast_format_ulaw) == AST_FORMAT_CMP_EQUAL) {
 ioctl(p->fd, PHONE_REC_STOP);
 if (!p->lastinput || (ast_format_cmp(p->lastinput, ast_format_ulaw) != AST_FORMAT_CMP_EQUAL)) {
 ao2_replace(p->lastinput, ast_format_ulaw);
 if (ioctl(p->fd, PHONE_REC_CODEC, ULAW)) {
 ast_log(LOG_WARNING, "Failed to set codec to uLaw\n");
 return -1;
 }
 }
 } else if (p->mode == MODE_FXS) {
 ioctl(p->fd, PHONE_REC_STOP);
 if (!p->lastinput || (ast_format_cmp(p->lastinput, ast_channel_rawreadformat(ast)) == AST_FORMAT_CMP_NOT_EQUAL)) {
 ao2_replace(p->lastinput, ast_channel_rawreadformat(ast));
 if (ioctl(p->fd, PHONE_REC_CODEC, ast_channel_rawreadformat(ast))) {
 ast_log(LOG_WARNING, "Failed to set codec to %s\n",
 ast_format_get_name(ast_channel_rawreadformat(ast)));
 return -1;
 }
 }
 } else {
 ast_log(LOG_WARNING, "Can't do format %s\n", ast_format_get_name(ast_channel_rawreadformat(ast)));
 return -1;
 }
 if (ioctl(p->fd, PHONE_REC_START)) {
 ast_log(LOG_WARNING, "Failed to start recording\n");
 return -1;
 }
 /* set the DTMF times (the default is too short) */
 ioctl(p->fd, PHONE_SET_TONE_ON_TIME, 300);
 ioctl(p->fd, PHONE_SET_TONE_OFF_TIME, 200);
 return 0;
}

static int phone_answer(struct ast_channel *ast)
{
 struct phone_pvt *p;
 p = ast_channel_tech_pvt(ast);
 /* In case it's a LineJack, take it off hook */
 if (p->mode == MODE_FXO) {
 if (ioctl(p->fd, PHONE_PSTN_SET_STATE, PSTN_OFF_HOOK))
 ast_debug(1, "ioctl(PHONE_PSTN_SET_STATE) failed on %s (%s)\n", ast_channel_name(ast), strerror(errno));
 else
 ast_debug(1, "Took linejack off hook\n");
 }
 phone_setup(ast);
 ast_debug(1, "phone_answer(%s)\n", ast_channel_name(ast));
 ast_channel_rings_set(ast, 0);
 ast_setstate(ast, AST_STATE_UP);
 return 0;
}

#if 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 '?';
}
#endif

static struct ast_frame *phone_exception(struct ast_channel *ast)
{
 int res;
 union telephony_exception phonee;
 struct phone_pvt *p = ast_channel_tech_pvt(ast);
 char digit;

 /* Some nice norms */
 p->fr.datalen = 0;
 p->fr.samples = 0;
 p->fr.data.ptr = NULL;
 p->fr.src = "Phone";
 p->fr.offset = 0;
 p->fr.mallocd=0;
 p->fr.delivery = ast_tv(0,0);

 phonee.bytes = ioctl(p->fd, PHONE_EXCEPTION);
 if (phonee.bits.dtmf_ready) {
 ast_debug(1, "phone_exception(): DTMF\n");

 /* We've got a digit -- Just handle this nicely and easily */
 digit = ioctl(p->fd, PHONE_GET_DTMF_ASCII);
 p->fr.subclass.integer = digit;
 p->fr.frametype = AST_FRAME_DTMF;
 return &p->fr;
 }
 if (phonee.bits.hookstate) {
 ast_debug(1, "Hookstate changed\n");
 res = ioctl(p->fd, PHONE_HOOKSTATE);
 /* See if we've gone on hook, if so, notify by returning NULL */
 ast_debug(1, "New hookstate: %d\n", res);
 if (!res && (p->mode != MODE_FXO))
 return NULL;
 else {
 if (ast_channel_state(ast) == AST_STATE_RINGING) {
 /* They've picked up the phone */
 p->fr.frametype = AST_FRAME_CONTROL;
 p->fr.subclass.integer = AST_CONTROL_ANSWER;
 phone_setup(ast);
 ast_setstate(ast, AST_STATE_UP);
 return &p->fr;
 } else
 ast_log(LOG_WARNING, "Got off hook in weird state %u\n", ast_channel_state(ast));
 }
 }
#if 1
 if (phonee.bits.pstn_ring)
 ast_verbose("Unit is ringing\n");
 if (phonee.bits.caller_id) {
 ast_verbose("We have caller ID\n");
 }
 if (phonee.bits.pstn_wink)
 ast_verbose("Detected Wink\n");
#endif
 /* Strange -- nothing there.. */
 p->fr.frametype = AST_FRAME_NULL;
 p->fr.subclass.integer = 0;
 return &p->fr;
}

static struct ast_frame *phone_read(struct ast_channel *ast)
{
 int res;
 struct phone_pvt *p = ast_channel_tech_pvt(ast);


 /* Some nice norms */
 p->fr.datalen = 0;
 p->fr.samples = 0;
 p->fr.data.ptr = NULL;
 p->fr.src = "Phone";
 p->fr.offset = 0;
 p->fr.mallocd=0;
 p->fr.delivery = ast_tv(0,0);

 /* Try to read some data... */
 CHECK_BLOCKING(ast);
 res = read(p->fd, p->buf, PHONE_MAX_BUF);
 ast_clear_flag(ast_channel_flags(ast), AST_FLAG_BLOCKING);
 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.ptr = p->buf;
 if (p->mode != MODE_FXS)
 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.samples = 240;
 p->fr.datalen = res;
 p->fr.frametype = ast_format_get_type(p->lastinput) == AST_MEDIA_TYPE_AUDIO ?
 AST_FRAME_VOICE : ast_format_get_type(p->lastinput) == AST_MEDIA_TYPE_IMAGE ?
 AST_FRAME_IMAGE : AST_FRAME_VIDEO;
 p->fr.subclass.format = p->lastinput;
 p->fr.offset = AST_FRIENDLY_OFFSET;
 /* Byteswap from little-endian to native-endian */
 if (ast_format_cmp(p->fr.subclass.format, ast_format_slin) == AST_FORMAT_CMP_EQUAL)
 ast_frame_byteswap_le(&p->fr);
 return &p->fr;
}

static int phone_write_buf(struct phone_pvt *p, const char *buf, int len, int frlen, int swap)
{
 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;
 if (swap)
 ast_swapcopy_samples(p->obuf+p->obuflen, buf, len/2);
 else
 memcpy(p->obuf + p->obuflen, buf, len);
 p->obuflen += len;
 while(p->obuflen > frlen) {
 res = write(p->fd, p->obuf, frlen);
 if (res != frlen) {
 if (res < 1) {
/*
 * Card is in non-blocking mode now and it works well now, but there are
 * lot of messages like this. So, this message is temporarily disabled.
 */
 return 0;
 } 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_send_text(struct ast_channel *ast, const char *text)
{
 int length = strlen(text);
 return phone_write_buf(ast_channel_tech_pvt(ast), text, length, length, 0) ==
 length ? 0 : -1;
}

static int phone_write(struct ast_channel *ast, struct ast_frame *frame)
{
 struct phone_pvt *p = ast_channel_tech_pvt(ast);
 int res;
 int maxfr=0;
 char *pos;
 int sofar;
 int expected;
 int codecset = 0;
 char tmpbuf[4];
 /* Write a frame of (presumably voice) data */
 if (frame->frametype != AST_FRAME_VOICE && p->mode != MODE_FXS) {
 if (frame->frametype != AST_FRAME_IMAGE)
 ast_log(LOG_WARNING, "Don't know what to do with frame type '%u'\n", frame->frametype);
 return 0;
 }
#if 0
 /* If we're not in up mode, go into up mode now */
 if (ast->_state != AST_STATE_UP) {
 ast_setstate(ast, AST_STATE_UP);
 phone_setup(ast);
 }
#else
 if (ast_channel_state(ast) != AST_STATE_UP) {
 /* Don't try tos end audio on-hook */
 return 0;
 }
#endif
 if (ast_format_cmp(frame->subclass.format, ast_format_g729) == AST_FORMAT_CMP_EQUAL) {
 if (!p->lastformat || (ast_format_cmp(p->lastformat, ast_format_g729) != AST_FORMAT_CMP_EQUAL)) {
 ioctl(p->fd, PHONE_PLAY_STOP);
 ioctl(p->fd, PHONE_REC_STOP);
 if (ioctl(p->fd, PHONE_PLAY_CODEC, G729)) {
 ast_log(LOG_WARNING, "Unable to set G729 mode\n");
 return -1;
 }
 if (ioctl(p->fd, PHONE_REC_CODEC, G729)) {
 ast_log(LOG_WARNING, "Unable to set G729 mode\n");
 return -1;
 }
 ao2_replace(p->lastformat, ast_format_g729);
 ao2_replace(p->lastinput, ast_format_g729);
 /* Reset output buffer */
 p->obuflen = 0;
 codecset = 1;
 }
 if (frame->datalen > 80) {
 ast_log(LOG_WARNING, "Frame size too large for G.729 (%d bytes)\n", frame->datalen);
 return -1;
 }
 maxfr = 80;
 } else if (ast_format_cmp(frame->subclass.format, ast_format_g723) == AST_FORMAT_CMP_EQUAL) {
 if (!p->lastformat || (ast_format_cmp(p->lastformat, ast_format_g723) != AST_FORMAT_CMP_EQUAL)) {
 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;
 }
 ao2_replace(p->lastformat, ast_format_g723);
 ao2_replace(p->lastinput, ast_format_g723);
 /* Reset output buffer */
 p->obuflen = 0;
 codecset = 1;
 }
 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 (ast_format_cmp(frame->subclass.format, ast_format_slin) == AST_FORMAT_CMP_EQUAL) {
 if (!p->lastformat || (ast_format_cmp(p->lastformat, ast_format_slin) != AST_FORMAT_CMP_EQUAL)) {
 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;
 }
 ao2_replace(p->lastformat, ast_format_slin);
 ao2_replace(p->lastinput, ast_format_slin);
 codecset = 1;
 /* Reset output buffer */
 p->obuflen = 0;
 }
 maxfr = 480;
 } else if (ast_format_cmp(frame->subclass.format, ast_format_ulaw) == AST_FORMAT_CMP_EQUAL) {
 if (!p->lastformat || (ast_format_cmp(p->lastformat, ast_format_ulaw) != AST_FORMAT_CMP_EQUAL)) {
 ioctl(p->fd, PHONE_PLAY_STOP);
 ioctl(p->fd, PHONE_REC_STOP);
 if (ioctl(p->fd, PHONE_PLAY_CODEC, ULAW)) {
 ast_log(LOG_WARNING, "Unable to set uLaw mode\n");
 return -1;
 }
 if (ioctl(p->fd, PHONE_REC_CODEC, ULAW)) {
 ast_log(LOG_WARNING, "Unable to set uLaw mode\n");
 return -1;
 }
 ao2_replace(p->lastformat, ast_format_ulaw);
 ao2_replace(p->lastinput, ast_format_ulaw);
 codecset = 1;
 /* Reset output buffer */
 p->obuflen = 0;
 }
 maxfr = 240;
 } else {
 if (!p->lastformat || (ast_format_cmp(p->lastformat, frame->subclass.format) != AST_FORMAT_CMP_EQUAL)) {
 ioctl(p->fd, PHONE_PLAY_STOP);
 ioctl(p->fd, PHONE_REC_STOP);
 if (ioctl(p->fd, PHONE_PLAY_CODEC, ast_format_compatibility_format2bitfield(frame->subclass.format))) {
 ast_log(LOG_WARNING, "Unable to set %s mode\n",
 ast_format_get_name(frame->subclass.format));
 return -1;
 }
 if (ioctl(p->fd, PHONE_REC_CODEC, ast_format_compatibility_format2bitfield(frame->subclass.format))) {
 ast_log(LOG_WARNING, "Unable to set %s mode\n",
 ast_format_get_name(frame->subclass.format));
 return -1;
 }
 ao2_replace(p->lastformat, frame->subclass.format);
 ao2_replace(p->lastinput, frame->subclass.format);
 codecset = 1;
 /* Reset output buffer */
 p->obuflen = 0;
 }
 maxfr = 480;
 }
 if (codecset) {
 ioctl(p->fd, PHONE_REC_DEPTH, 3);
 ioctl(p->fd, PHONE_PLAY_DEPTH, 3);
 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 frame of Appropriate data */
 sofar = 0;
 pos = frame->data.ptr;
 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) {
 memcpy(tmpbuf, frame->data.ptr, 4);
 expected = 24;
 res = phone_write_buf(p, tmpbuf, expected, maxfr, 0);
 }
 res = 4;
 expected=4;
 } else {
 int swap = 0;
#if __BYTE_ORDER == __BIG_ENDIAN
 if (ast_format_cmp(frame->subclass.format, ast_format_slin) == AST_FORMAT_CMP_EQUAL)
 swap = 1; /* Swap big-endian samples to little-endian as we copy */
#endif
 res = phone_write_buf(p, pos, expected, maxfr, swap);
 }
 if (res != expected) {
 if ((errno != EAGAIN) && (errno != EINTR)) {
 if (res < 0)
 ast_log(LOG_WARNING, "Write returned error (%s)\n", strerror(errno));
 /*
 * Card is in non-blocking mode now and it works well now, but there are
 * lot of messages like this. So, this message is temporarily disabled.
 */
#if 0
 else
 ast_log(LOG_WARNING, "Only wrote %d of %d bytes\n", res, frame->datalen);
#endif
 return -1;
 } else /* Pretend it worked */
 res = expected;
 }
 sofar += res;
 pos += res;
 }
 return 0;
}

static struct ast_channel *phone_new(struct phone_pvt *i, int state, char *cntx, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor)
{
 struct ast_format_cap *caps = NULL;
 struct ast_channel *tmp;
 struct phone_codec_data queried_codec;
 struct ast_format *tmpfmt;
 caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
 tmp = ast_channel_alloc(1, state, i->cid_num, i->cid_name, "", i->ext, i->context, assignedids, requestor, 0, "Phone/%s", i->dev + 5);
 if (tmp && caps) {
 ast_channel_lock(tmp);
 ast_channel_tech_set(tmp, cur_tech);
 ast_channel_set_fd(tmp, 0, i->fd);
 /* XXX Switching formats silently causes kernel panics XXX */
 if (i->mode == MODE_FXS &&
 ioctl(i->fd, PHONE_QUERY_CODEC, &queried_codec) == 0) {
 if (queried_codec.type == LINEAR16) {
 ast_format_cap_append(caps, ast_format_slin, 0);
 } else {
 ast_format_cap_remove(prefcap, ast_format_slin);
 ast_format_cap_append_from_cap(caps, prefcap, AST_MEDIA_TYPE_UNKNOWN);
 }
 } else {
 ast_format_cap_append_from_cap(caps, prefcap, AST_MEDIA_TYPE_UNKNOWN);
 }
 tmpfmt = ast_format_cap_get_format(caps, 0);
 ast_channel_nativeformats_set(tmp, caps);
 ao2_ref(caps, -1);
 ast_channel_set_rawreadformat(tmp, tmpfmt);
 ast_channel_set_rawwriteformat(tmp, tmpfmt);
 ao2_ref(tmpfmt, -1);
 /* no need to call ast_setstate: the channel_alloc already did its job */
 if (state == AST_STATE_RING)
 ast_channel_rings_set(tmp, 1);
 ast_channel_tech_pvt_set(tmp, i);
 ast_channel_context_set(tmp, cntx);
 if (!ast_strlen_zero(i->ext))
 ast_channel_exten_set(tmp, i->ext);
 else
 ast_channel_exten_set(tmp, "s");
 if (!ast_strlen_zero(i->language))
 ast_channel_language_set(tmp, i->language);

 /* Don't use ast_set_callerid() here because it will
 * generate a NewCallerID event before the NewChannel event */
 if (!ast_strlen_zero(i->cid_num)) {
 ast_channel_caller(tmp)->ani.number.valid = 1;
 ast_channel_caller(tmp)->ani.number.str = ast_strdup(i->cid_num);
 }

 i->owner = tmp;
 ast_module_ref(ast_module_info->self);
 ast_channel_unlock(tmp);
 if (state != AST_STATE_DOWN) {
 if (state == AST_STATE_RING) {
 ioctl(ast_channel_fd(tmp, 0), PHONE_RINGBACK);
 i->cpt = 1;
 }
 if (ast_pbx_start(tmp)) {
 ast_log(LOG_WARNING, "Unable to start PBX on %s\n", ast_channel_name(tmp));
 ast_hangup(tmp);
 }
 }
 } else {
 ao2_cleanup(caps);
 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: %s\n", res, strerror(errno));
 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_debug(1, "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 || i->mode == MODE_FXS || i->mode == MODE_SIGMA) {
 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)
 strncat(i->ext, digit, sizeof(i->ext) - strlen(i->ext) - 1);
 if ((i->mode != MODE_FXS ||
 !(phonee.bytes = ioctl(i->fd, PHONE_EXCEPTION)) ||
 !phonee.bits.dtmf_ready) &&
 ast_exists_extension(NULL, i->context, i->ext, 1, i->cid_num)) {
 /* It's a valid extension in its context, get moving! */
 phone_new(i, AST_STATE_RING, i->context, NULL, NULL);
 /* No need to restart monitor, we are the monitor */
 } else if (!ast_canmatch_extension(NULL, i->context, i->ext, 1, i->cid_num)) {
 /* There is nothing in the specified extension that can match anymore.
 Try the default */
 if (ast_exists_extension(NULL, "default", i->ext, 1, i->cid_num)) {
 /* Check the default, too... */
 phone_new(i, AST_STATE_RING, "default", NULL, NULL);
 /* XXX This should probably be justified better XXX */
 } else if (!ast_canmatch_extension(NULL, "default", i->ext, 1, i->cid_num)) {
 /* It's not a valid extension, give a busy signal */
 ast_debug(1, "%s can't match anything in %s or default\n", i->ext, i->context);
 ioctl(i->fd, PHONE_BUSY);
 i->cpt = 1;
 }
 }
#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, NULL, NULL);
 } else if (i->mode == MODE_DIALTONE) {
 ast_module_ref(ast_module_info->self);
 /* 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);
 ao2_cleanup(i->lastformat);
 i->lastformat = NULL;
 } else if (i->mode == MODE_SIGMA) {
 ast_module_ref(ast_module_info->self);
 /* Reset the extension */
 i->ext[0] = '\0';
 /* Play the dialtone */
 i->dialtone++;
 ioctl(i->fd, PHONE_DIALTONE);
 }
 } else {
 if (i->dialtone)
 ast_module_unref(ast_module_info->self);
 memset(i->ext, 0, sizeof(i->ext));
 if (i->cpt)
 {
 ioctl(i->fd, PHONE_CPT_STOP);
 i->cpt = 0;
 }
 ioctl(i->fd, PHONE_PLAY_STOP);
 ioctl(i->fd, PHONE_REC_STOP);
 i->dialtone = 0;
 ao2_cleanup(i->lastformat);
 i->lastformat = NULL;
 }
 }
 if (phonee.bits.pstn_ring) {
 ast_verbose("Unit is ringing\n");
 phone_new(i, AST_STATE_RING, i->context, NULL, NULL);
 }
 if (phonee.bits.caller_id)
 ast_verbose("We have caller ID\n");


}

static void *do_monitor(void *data)
{
 struct pollfd *fds = NULL;
 int nfds = 0, inuse_fds = 0, res;
 struct phone_pvt *i;
 int tonepos = 0;
 /* The tone we're playing this round */
 struct timeval to = { 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 */
 while (monitor) {
 /* 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. */
 /* Lock the interface list */
 if (ast_mutex_lock(&iflock)) {
 ast_log(LOG_ERROR, "Unable to grab interface lock\n");
 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 */
 i = iflist;
 dotone = 0;
 inuse_fds = 0;
 for (i = iflist; i; i = i->next) {
 if (!i->owner) {
 /* This needs to be watched, as it lacks an owner */
 if (inuse_fds == nfds) {
 void *tmp = ast_realloc(fds, (nfds + 1) * sizeof(*fds));
 if (!tmp) {
 /* Avoid leaking */
 continue;
 }
 fds = tmp;
 nfds++;
 }
 fds[inuse_fds].fd = i->fd;
 fds[inuse_fds].events = POLLIN | POLLERR;
 fds[inuse_fds].revents = 0;
 inuse_fds++;

 if (i->dialtone && i->mode != MODE_SIGMA) {
 /* Remember we're going to have to come back and play
 more dialtones */
 if (ast_tvzero(to)) {
 /* 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++;
 }
 }
 }
 /* Okay, now that we know what to do, release the interface lock */
 ast_mutex_unlock(&iflock);

 /* Wait indefinitely for something to happen */
 if (dotone && i && i->mode != MODE_SIGMA) {
 /* If we're ready to recycle the time, set it to 30 ms */
 tonepos += 240;
 if (tonepos >= sizeof(DialTone)) {
 tonepos = 0;
 }
 if (ast_tvzero(to)) {
 to = ast_tv(0, 30000);
 }
 res = ast_poll2(fds, inuse_fds, &to);
 } else {
 res = ast_poll(fds, inuse_fds, -1);
 to = ast_tv(0, 0);
 tonepos = 0;
 }
 /* Okay, select has finished. Let's see what happened. */
 if (res < 0) {
 ast_debug(1, "poll returned %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 (ast_mutex_lock(&iflock)) {
 ast_log(LOG_WARNING, "Unable to lock the interface list\n");
 continue;
 }

 for (i = iflist; i; i = i->next) {
 int j;
 /* Find the record */
 for (j = 0; j < inuse_fds; j++) {
 if (fds[j].fd == i->fd) {
 break;
 }
 }

 /* Not found? */
 if (j == inuse_fds) {
 continue;
 }

 if (fds[j].revents & POLLIN) {
 if (i->owner) {
 continue;
 }
 phone_mini_packet(i);
 }
 if (fds[j].revents & POLLERR) {
 if (i->owner) {
 continue;
 }
 phone_check_exception(i);
 }
 }
 ast_mutex_unlock(&iflock);
 }
 return NULL;
}

static int restart_monitor()
{
 /* If we're supposed to be stopped -- stay stopped */
 if (monitor_thread == AST_PTHREADT_STOP)
 return 0;
 if (ast_mutex_lock(&monlock)) {
 ast_log(LOG_WARNING, "Unable to lock monitor\n");
 return -1;
 }
 if (monitor_thread == pthread_self()) {
 ast_mutex_unlock(&monlock);
 ast_log(LOG_WARNING, "Cannot kill myself\n");
 return -1;
 }
 if (monitor_thread != AST_PTHREADT_NULL) {
 if (ast_mutex_lock(&iflock)) {
 ast_mutex_unlock(&monlock);
 ast_log(LOG_WARNING, "Unable to lock the interface list\n");
 return -1;
 }
 monitor = 0;
 while (pthread_kill(monitor_thread, SIGURG) == 0)
 sched_yield();
 pthread_join(monitor_thread, NULL);
 ast_mutex_unlock(&iflock);
 }
 monitor = 1;
 /* Start a new monitor */
 if (ast_pthread_create_background(&monitor_thread, NULL, do_monitor, NULL) < 0) {
 ast_mutex_unlock(&monlock);
 ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
 return -1;
 }
 ast_mutex_unlock(&monlock);
 return 0;
}

static struct phone_pvt *mkif(const char *iface, int mode, int txgain, int rxgain)
{
 /* Make a phone_pvt structure for this interface */
 struct phone_pvt *tmp;

 tmp = ast_calloc(1, sizeof(*tmp));
 if (tmp) {
 tmp->fd = open(iface, O_RDWR);
 if (tmp->fd < 0) {
 ast_log(LOG_WARNING, "Unable to open '%s'\n", iface);
 ast_free(tmp);
 return NULL;
 }
 if (mode == MODE_FXO) {
 if (ioctl(tmp->fd, IXJCTL_PORT, PORT_PSTN)) {
 ast_debug(1, "Unable to set port to PSTN\n");
 }
 } else {
 if (ioctl(tmp->fd, IXJCTL_PORT, PORT_POTS))
 if (mode != MODE_FXS)
 ast_debug(1, "Unable to set port to POTS\n");
 }
 ioctl(tmp->fd, PHONE_PLAY_STOP);
 ioctl(tmp->fd, PHONE_REC_STOP);
 ioctl(tmp->fd, PHONE_RING_STOP);
 ioctl(tmp->fd, PHONE_CPT_STOP);
 if (ioctl(tmp->fd, PHONE_PSTN_SET_STATE, PSTN_ON_HOOK))
 ast_debug(1, "ioctl(PHONE_PSTN_SET_STATE) failed on %s (%s)\n",iface, strerror(errno));
 if (echocancel != AEC_OFF)
 ioctl(tmp->fd, IXJCTL_AEC_START, echocancel);
 if (silencesupression)
 tmp->silencesupression = 1;
#ifdef PHONE_VAD
 ioctl(tmp->fd, PHONE_VAD, tmp->silencesupression);
#endif
 tmp->mode = mode;
 ast_fd_set_flags(tmp->fd, O_NONBLOCK);
 tmp->owner = NULL;
 ao2_cleanup(tmp->lastformat);
 tmp->lastformat = NULL;
 ao2_cleanup(tmp->lastinput);
 tmp->lastinput = NULL;
 tmp->ministate = 0;
 memset(tmp->ext, 0, sizeof(tmp->ext));
 ast_copy_string(tmp->language, language, sizeof(tmp->language));
 ast_copy_string(tmp->dev, iface, sizeof(tmp->dev));
 ast_copy_string(tmp->context, context, sizeof(tmp->context));
 tmp->next = NULL;
 tmp->obuflen = 0;
 tmp->dialtone = 0;
 tmp->cpt = 0;
 ast_copy_string(tmp->cid_num, cid_num, sizeof(tmp->cid_num));
 ast_copy_string(tmp->cid_name, cid_name, sizeof(tmp->cid_name));
 tmp->txgain = txgain;
 ioctl(tmp->fd, PHONE_PLAY_VOLUME, tmp->txgain);
 tmp->rxgain = rxgain;
 ioctl(tmp->fd, PHONE_REC_VOLUME, tmp->rxgain);
 }
 return tmp;
}

static struct ast_channel *phone_request(const char *type, struct ast_format_cap *cap, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause)
{
 struct phone_pvt *p;
 struct ast_channel *tmp = NULL;
 const char *name = data;

 /* Search for an unowned channel */
 if (ast_mutex_lock(&iflock)) {
 ast_log(LOG_ERROR, "Unable to lock interface list???\n");
 return NULL;
 }
 p = iflist;
 while(p) {
 if (p->mode == MODE_FXS || (ast_format_cap_iscompatible(cap, phone_tech.capabilities))) {
 size_t length = strlen(p->dev + 5);
 if (strncmp(name, p->dev + 5, length) == 0 &&
 !isalnum(name[length])) {
 if (!p->owner) {
 tmp = phone_new(p, AST_STATE_DOWN, p->context, assignedids, requestor);
 break;
 } else
 *cause = AST_CAUSE_BUSY;
 }
 }
 p = p->next;
 }
 ast_mutex_unlock(&iflock);
 restart_monitor();
 if (tmp == NULL) {
 if (!(ast_format_cap_iscompatible(cap, phone_tech.capabilities))) {
 struct ast_str *codec_buf = ast_str_alloca(AST_FORMAT_CAP_NAMES_LEN);
 ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%s'\n",
 ast_format_cap_get_names(cap, &codec_buf));
 return NULL;
 }
 }
 return tmp;
}

/* parse gain value from config file */
static int parse_gain_value(const char *gain_type, const char *value)
{
 float gain;

 /* try to scan number */
 if (sscanf(value, "%30f", &gain) != 1)
 {
 ast_log(LOG_ERROR, "Invalid %s value '%s' in '%s' config\n",
 value, gain_type, config);
 return DEFAULT_GAIN;
 }

 /* multiplicate gain by 1.0 gain value */
 gain = gain * (float)DEFAULT_GAIN;

 /* percentage? */
 if (value[strlen(value) - 1] == '%')
 return (int)(gain / (float)100);

 return (int)gain;
}

static int __unload_module(void)
{
 struct phone_pvt *p, *pl;
 /* First, take us out of the channel loop */
 if (cur_tech)
 ast_channel_unregister(cur_tech);
 if (!ast_mutex_lock(&iflock)) {
 /* Hangup all interfaces if they have an owner */
 p = iflist;
 while(p) {
 if (p->owner)
 ast_softhangup(p->owner, AST_SOFTHANGUP_APPUNLOAD);
 p = p->next;
 }
 iflist = NULL;
 ast_mutex_unlock(&iflock);
 } else {
 ast_log(LOG_WARNING, "Unable to lock the monitor\n");
 return -1;
 }
 if (!ast_mutex_lock(&monlock)) {
 if (monitor_thread > AST_PTHREADT_NULL) {
 monitor = 0;
 while (pthread_kill(monitor_thread, SIGURG) == 0)
 sched_yield();
 pthread_join(monitor_thread, NULL);
 }
 monitor_thread = AST_PTHREADT_STOP;
 ast_mutex_unlock(&monlock);
 } else {
 ast_log(LOG_WARNING, "Unable to lock the monitor\n");
 return -1;
 }

 if (!ast_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 */
 ast_free(pl);
 }
 iflist = NULL;
 ast_mutex_unlock(&iflock);
 } else {
 ast_log(LOG_WARNING, "Unable to lock the monitor\n");
 return -1;
 }

 ao2_ref(phone_tech.capabilities, -1);
 ao2_ref(phone_tech_fxs.capabilities, -1);
 ao2_ref(prefcap, -1);

 return 0;
}

static int unload_module(void)
{
 return __unload_module();
}

static int load_module(void)
{
 struct ast_config *cfg;
 struct ast_variable *v;
 struct phone_pvt *tmp;
 int mode = MODE_IMMEDIATE;
 int txgain = DEFAULT_GAIN, rxgain = DEFAULT_GAIN; /* default gain 1.0 */
 struct ast_flags config_flags = { 0 };

 if (!(phone_tech.capabilities = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
 return AST_MODULE_LOAD_DECLINE;
 }

 ast_format_cap_append(phone_tech.capabilities, ast_format_g723, 0);
 ast_format_cap_append(phone_tech.capabilities, ast_format_slin, 0);
 ast_format_cap_append(phone_tech.capabilities, ast_format_ulaw, 0);
 ast_format_cap_append(phone_tech.capabilities, ast_format_g729, 0);

 if (!(prefcap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
 return AST_MODULE_LOAD_DECLINE;
 }
 ast_format_cap_append_from_cap(prefcap, phone_tech.capabilities, AST_MEDIA_TYPE_UNKNOWN);
 if (!(phone_tech_fxs.capabilities = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
 return AST_MODULE_LOAD_DECLINE;
 }

 if ((cfg = ast_config_load(config, config_flags)) == CONFIG_STATUS_FILEINVALID) {
 ast_log(LOG_ERROR, "Config file %s is in an invalid format. Aborting.\n", config);
 return AST_MODULE_LOAD_DECLINE;
 }

 /* We *must* have a config file otherwise stop immediately */
 if (!cfg) {
 ast_log(LOG_ERROR, "Unable to load config %s\n", config);
 return AST_MODULE_LOAD_DECLINE;
 }
 if (ast_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 AST_MODULE_LOAD_DECLINE;
 }
 v = ast_variable_browse(cfg, "interfaces");
 while(v) {
 /* Create the interface list */
 if (!strcasecmp(v->name, "device")) {
 tmp = mkif(v->value, mode, txgain, rxgain);
 if (tmp) {
 tmp->next = iflist;
 iflist = tmp;

 } else {
 ast_log(LOG_ERROR, "Unable to register channel '%s'\n", v->value);
 ast_config_destroy(cfg);
 ast_mutex_unlock(&iflock);
 __unload_module();
 return AST_MODULE_LOAD_DECLINE;
 }
 } else if (!strcasecmp(v->name, "silencesupression")) {
 silencesupression = ast_true(v->value);
 } else if (!strcasecmp(v->name, "language")) {
 ast_copy_string(language, v->value, sizeof(language));
 } else if (!strcasecmp(v->name, "callerid")) {
 ast_callerid_split(v->value, cid_name, sizeof(cid_name), cid_num, sizeof(cid_num));
 } else if (!strcasecmp(v->name, "mode")) {
 if (!strncasecmp(v->value, "di", 2))
 mode = MODE_DIALTONE;
 else if (!strncasecmp(v->value, "sig", 3))
 mode = MODE_SIGMA;
 else if (!strncasecmp(v->value, "im", 2))
 mode = MODE_IMMEDIATE;
 else if (!strncasecmp(v->value, "fxs", 3)) {
 mode = MODE_FXS;
 ast_format_cap_remove_by_type(prefcap, AST_MEDIA_TYPE_AUDIO); /* All non-voice */
 }
 else if (!strncasecmp(v->value, "fx", 2))
 mode = MODE_FXO;
 else
 ast_log(LOG_WARNING, "Unknown mode: %s\n", v->value);
 } else if (!strcasecmp(v->name, "context")) {
 ast_copy_string(context, v->value, sizeof(context));
 } else if (!strcasecmp(v->name, "format")) {
 if (!strcasecmp(v->value, "g729")) {
 ast_format_cap_remove_by_type(prefcap, AST_MEDIA_TYPE_UNKNOWN);
 ast_format_cap_append(prefcap, ast_format_g729, 0);
 } else if (!strcasecmp(v->value, "g723.1")) {
 ast_format_cap_remove_by_type(prefcap, AST_MEDIA_TYPE_UNKNOWN);
 ast_format_cap_append(prefcap, ast_format_g723, 0);
 } else if (!strcasecmp(v->value, "slinear")) {
 if (mode == MODE_FXS) {
 ast_format_cap_append(prefcap, ast_format_slin, 0);
 } else {
 ast_format_cap_remove_by_type(prefcap, AST_MEDIA_TYPE_UNKNOWN);
 ast_format_cap_append(prefcap, ast_format_slin, 0);
 }
 } else if (!strcasecmp(v->value, "ulaw")) {
 ast_format_cap_remove_by_type(prefcap, AST_MEDIA_TYPE_UNKNOWN);
 ast_format_cap_append(prefcap, ast_format_ulaw, 0);
 } 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);
 } else if (!strcasecmp(v->name, "txgain")) {
 txgain = parse_gain_value(v->name, v->value);
 } else if (!strcasecmp(v->name, "rxgain")) {
 rxgain = parse_gain_value(v->name, v->value);
 }
 v = v->next;
 }
 ast_mutex_unlock(&iflock);

 if (mode == MODE_FXS) {
 ast_format_cap_append_from_cap(phone_tech_fxs.capabilities, prefcap, AST_MEDIA_TYPE_UNKNOWN);
 cur_tech = &phone_tech_fxs;
 } else
 cur_tech = (struct ast_channel_tech *) &phone_tech;

 /* Make sure we can register our Adtranphone channel type */

 if (ast_channel_register(cur_tech)) {
 ast_log(LOG_ERROR, "Unable to register channel class 'Phone'\n");
 ast_config_destroy(cfg);
 __unload_module();
 return AST_MODULE_LOAD_DECLINE;
 }
 ast_config_destroy(cfg);
 /* And start the monitor for the first time */
 restart_monitor();
 return AST_MODULE_LOAD_SUCCESS;
}

AST_MODULE_INFO_STANDARD_DEPRECATED(ASTERISK_GPL_KEY, "Linux Telephony API Support");