489 lines
12 KiB
C
Executable File
489 lines
12 KiB
C
Executable File
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* A/Open ITU-56/2 Voice Modem Driver (Rockwell, IS-101, and others)
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <asterisk/lock.h>
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#include <asterisk/vmodem.h>
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#include <asterisk/module.h>
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#include <asterisk/frame.h>
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#include <asterisk/logger.h>
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#include <asterisk/options.h>
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#define STATE_COMMAND 0
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#define STATE_VOICE 1
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#define VRA "40" /* Number of 100ms of non-ring after a ring cadence after which we consider the lien to be answered */
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#define VRN "100" /* Number of 100ms of non-ring with no cadence after which we assume an answer */
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static char *breakcmd = "\0x10\0x03";
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static char *desc = "A/Open (Rockwell Chipset) ITU-2 VoiceModem Driver";
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static int usecnt;
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AST_MUTEX_DEFINE_STATIC(usecnt_lock);
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static char *aopen_idents[] = {
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/* Identify A/Open Modem */
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"V2.210-V90_2M_DLP",
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NULL
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};
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static int aopen_setdev(struct ast_modem_pvt *p, int dev)
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{
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char cmd[80];
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if (ast_modem_send(p, "AT#VLS?", 0)) {
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ast_log(LOG_WARNING, "Unable to select current mode %d\n", dev);
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return -1;
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}
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if (ast_modem_read_response(p, 5)) {
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ast_log(LOG_WARNING, "Unable to select device %d\n", dev);
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return -1;
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}
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ast_modem_trim(p->response);
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strncpy(cmd, p->response, sizeof(cmd)-1);
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if (ast_modem_expect(p, "OK", 5)) {
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ast_log(LOG_WARNING, "Modem did not respond properly\n");
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return -1;
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}
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if (dev == atoi(cmd)) {
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/* We're already in the right mode, don't bother changing for fear of
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hanging up */
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return 0;
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}
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snprintf(cmd, sizeof(cmd), "AT#VLS=%d", dev);
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if (ast_modem_send(p, cmd, 0)) {
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ast_log(LOG_WARNING, "Unable to select device %d\n", dev);
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return -1;
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}
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if (ast_modem_read_response(p, 5)) {
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ast_log(LOG_WARNING, "Unable to select device %d\n", dev);
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return -1;
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}
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ast_modem_trim(p->response);
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if (strcasecmp(p->response, "VCON") && strcasecmp(p->response, "OK")) {
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ast_log(LOG_WARNING, "Unexpected reply: %s\n", p->response);
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return -1;
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}
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return 0;
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}
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static int aopen_startrec(struct ast_modem_pvt *p)
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{
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if (ast_modem_send(p, "AT#VRX", 0) ||
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ast_modem_expect(p, "CONNECT", 5)) {
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ast_log(LOG_WARNING, "Unable to start recording\n");
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return -1;
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}
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p->ministate = STATE_VOICE;
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return 0;
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}
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static int aopen_break(struct ast_modem_pvt *p)
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{
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if (ast_modem_send(p, "\r\n", 2)) {
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ast_log(LOG_WARNING, "Failed to send enter?\n");
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return -1;
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}
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if (ast_modem_send(p, breakcmd, 2)) {
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ast_log(LOG_WARNING, "Failed to break\n");
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return -1;
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}
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if (ast_modem_send(p, "\r\n", 2)) {
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ast_log(LOG_WARNING, "Failed to send enter?\n");
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return -1;
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}
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/* Read any outstanding junk */
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while(!ast_modem_read_response(p, 1));
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if (ast_modem_send(p, "AT", 0)) {
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/* Modem might be stuck in some weird mode, try to get it out */
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ast_modem_send(p, "+++", 3);
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if (ast_modem_expect(p, "OK", 10)) {
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ast_log(LOG_WARNING, "Modem is not responding\n");
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return -1;
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}
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if (ast_modem_send(p, "AT", 0)) {
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ast_log(LOG_WARNING, "Modem is not responding\n");
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return -1;
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}
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}
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if (ast_modem_expect(p, "OK", 5)) {
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ast_log(LOG_WARNING, "Modem did not respond properly\n");
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return -1;
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}
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return 0;
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}
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static int aopen_init(struct ast_modem_pvt *p)
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{
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if (option_debug)
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ast_log(LOG_DEBUG, "aopen_init()\n");
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if (aopen_break(p))
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return -1;
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/* Force into command mode */
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p->ministate = STATE_COMMAND;
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if (ast_modem_send(p, "AT#BDR=0", 0) ||
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ast_modem_expect(p, "OK", 5)) {
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ast_log(LOG_WARNING, "Unable to set to auto-baud\n");
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return -1;
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}
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if (ast_modem_send(p, "AT#CLS=8", 0) ||
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ast_modem_expect(p, "OK", 5)) {
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ast_log(LOG_WARNING, "Unable to set to voice mode\n");
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return -1;
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}
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if (ast_modem_send(p, "AT#VBS=8", 0) ||
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ast_modem_expect(p, "OK", 5)) {
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ast_log(LOG_WARNING, "Unable to set to 8-bit mode\n");
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return -1;
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}
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if (ast_modem_send(p, "AT#VSR=8000", 0) ||
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ast_modem_expect(p, "OK", 5)) {
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ast_log(LOG_WARNING, "Unable to set to 8000 Hz sampling\n");
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return -1;
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}
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if (ast_modem_send(p, "AT#VLS=0", 0) ||
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ast_modem_expect(p, "OK", 5)) {
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ast_log(LOG_WARNING, "Unable to set to telco interface\n");
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return -1;
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}
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if (ast_modem_send(p, "AT#VRA=" VRA, 0) ||
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ast_modem_expect(p, "OK", 5)) {
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ast_log(LOG_WARNING, "Unable to set to 'ringback goes away' timer\n");
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return -1;
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}
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if (ast_modem_send(p, "AT#VRN=" VRN, 0) ||
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ast_modem_expect(p, "OK", 5)) {
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ast_log(LOG_WARNING, "Unable to set to 'ringback never came timer'\n");
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return -1;
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}
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if (ast_modem_send(p, "AT#VTD=3F,3F,3F", 0) ||
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ast_modem_expect(p, "OK", 5)) {
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ast_log(LOG_WARNING, "Unable to set to tone detection\n");
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return -1;
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}
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return 0;
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}
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static struct ast_frame *aopen_handle_escape(struct ast_modem_pvt *p, char esc)
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{
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/* Handle escaped characters -- but sometimes we call it directly as
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a quick way to cause known responses */
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p->fr.frametype = AST_FRAME_NULL;
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p->fr.subclass = 0;
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p->fr.data = NULL;
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p->fr.datalen = 0;
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p->fr.samples = 0;
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p->fr.offset = 0;
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p->fr.mallocd = 0;
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p->fr.delivery.tv_sec = 0;
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p->fr.delivery.tv_usec = 0;
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if (esc)
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ast_log(LOG_DEBUG, "Escaped character '%c'\n", esc);
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switch(esc) {
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case 'R': /* Pseudo ring */
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p->fr.frametype = AST_FRAME_CONTROL;
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p->fr.subclass = AST_CONTROL_RING;
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return &p->fr;
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case 'X': /* Pseudo connect */
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p->fr.frametype = AST_FRAME_CONTROL;
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p->fr.subclass = AST_CONTROL_RING;
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if (p->owner)
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ast_setstate(p->owner, AST_STATE_UP);
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if (aopen_startrec(p))
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return NULL;
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return &p->fr;
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case 'b': /* Busy signal */
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p->fr.frametype = AST_FRAME_CONTROL;
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p->fr.subclass = AST_CONTROL_BUSY;
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return &p->fr;
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case 'o': /* Overrun */
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ast_log(LOG_WARNING, "Overflow on modem, flushing buffers\n");
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if (ast_modem_send(p, "\0x10E", 2))
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ast_log(LOG_WARNING, "Unable to flush buffers\n");
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return &p->fr;
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case 'u': /* Underrun */
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ast_log(LOG_WARNING, "Data underrun\n");
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/* Fall Through */
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case CHAR_ETX: /* End Transmission */
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case 'd': /* Dialtone */
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case 'c': /* Calling Tone */
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case 'e': /* European version */
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case 'a': /* Answer Tone */
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case 'f': /* Bell Answer Tone */
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case 'T': /* Timing mark */
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case 't': /* Handset off hook */
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case 'h': /* Handset hungup */
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case 0: /* Pseudo signal */
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/* Ignore */
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return &p->fr;
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default:
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ast_log(LOG_DEBUG, "Unknown Escaped character '%c' (%d)\n", esc, esc);
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}
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return &p->fr;
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}
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static struct ast_frame *aopen_read(struct ast_modem_pvt *p)
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{
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char result[256];
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short *b;
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struct ast_frame *f=NULL;
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int res;
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int x;
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if (p->ministate == STATE_COMMAND) {
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/* Read the first two bytes, first, in case it's a control message */
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fread(result, 1, 2, p->f);
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if (result[0] == CHAR_DLE) {
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return aopen_handle_escape(p, result[1]);
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} else {
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if ((result[0] == '\n') || (result[0] == '\r'))
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return aopen_handle_escape(p, 0);
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/* Read the rest of the line */
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fgets(result + 2, sizeof(result) - 2, p->f);
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ast_modem_trim(result);
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if (!strcasecmp(result, "VCON")) {
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/* If we're in immediate mode, reply now */
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if (p->mode == MODEM_MODE_IMMEDIATE)
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return aopen_handle_escape(p, 'X');
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} else
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if (!strcasecmp(result, "BUSY")) {
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/* Same as a busy signal */
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return aopen_handle_escape(p, 'b');
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} else
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if (!strcasecmp(result, "RING")) {
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return aopen_handle_escape(p, 'R');
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} else
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if (!strcasecmp(result, "NO DIALTONE")) {
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/* There's no dialtone, so the line isn't working */
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ast_log(LOG_WARNING, "Device '%s' lacking dialtone\n", p->dev);
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return NULL;
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}
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ast_log(LOG_DEBUG, "Modem said '%s'\n", result);
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return aopen_handle_escape(p, 0);
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}
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} else {
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/* We have to be more efficient in voice mode */
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b = (short *)(p->obuf + p->obuflen);
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while (p->obuflen/2 < 240) {
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/* Read ahead the full amount */
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res = fread(result, 1, 240 - p->obuflen/2, p->f);
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if (res < 1) {
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/* If there's nothing there, just continue on */
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if (errno == EAGAIN)
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return aopen_handle_escape(p, 0);
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ast_log(LOG_WARNING, "Read failed: %s\n", strerror(errno));
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}
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for (x=0;x<res;x++) {
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/* Process all the bytes that we've read */
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if (result[x] == CHAR_DLE) {
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/* We assume there is no more than one signal frame among our
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data. */
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if (f)
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ast_log(LOG_WARNING, "Warning: Dropped a signal frame\n");
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f = aopen_handle_escape(p, result[x+1]);
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/* If aopen_handle_escape says NULL, say it now, doesn't matter
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what else is there, the connection is dead. */
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if (!f)
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return NULL;
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} else {
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/* Generate a 16-bit signed linear value from our
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unsigned 8-bit value */
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*(b++) = (((short)result[x]) - 127) * 0xff;
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p->obuflen += 2;
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}
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}
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if (f)
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break;
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}
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/* If we have a control frame, return it now */
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if (f)
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return f;
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/* If we get here, we have a complete voice frame */
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p->fr.frametype = AST_FRAME_VOICE;
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p->fr.subclass = AST_FORMAT_SLINEAR;
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p->fr.samples = 240;
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p->fr.data = p->obuf;
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p->fr.datalen = p->obuflen;
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p->fr.mallocd = 0;
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p->fr.delivery.tv_sec = 0;
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p->fr.delivery.tv_usec = 0;
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p->fr.offset = AST_FRIENDLY_OFFSET;
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p->fr.src = __FUNCTION__;
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if (option_debug)
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ast_log(LOG_DEBUG, "aopen_read(voice frame)\n");
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p->obuflen = 0;
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return &p->fr;
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}
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return NULL;
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}
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static int aopen_write(struct ast_modem_pvt *p, struct ast_frame *f)
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{
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if (option_debug)
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ast_log(LOG_DEBUG, "aopen_write()\n");
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return 0;
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}
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static char *aopen_identify(struct ast_modem_pvt *p)
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{
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char identity[256];
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char mfr[80];
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char mdl[80];
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char rev[80];
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ast_modem_send(p, "AT#MDL?", 0);
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ast_modem_read_response(p, 5);
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strncpy(mdl, p->response, sizeof(mdl)-1);
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ast_modem_trim(mdl);
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ast_modem_expect(p, "OK", 5);
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ast_modem_send(p, "AT#MFR?", 0);
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ast_modem_read_response(p, 5);
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strncpy(mfr, p->response, sizeof(mfr)-1);
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ast_modem_trim(mfr);
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ast_modem_expect(p, "OK", 5);
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ast_modem_send(p, "AT#REV?", 0);
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ast_modem_read_response(p, 5);
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strncpy(rev, p->response, sizeof(rev)-1);
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ast_modem_trim(rev);
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ast_modem_expect(p, "OK", 5);
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snprintf(identity, sizeof(identity), "%s Model %s Revision %s", mfr, mdl, rev);
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return strdup(identity);
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}
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static void aopen_incusecnt(void)
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{
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ast_mutex_lock(&usecnt_lock);
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usecnt++;
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ast_mutex_unlock(&usecnt_lock);
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ast_update_use_count();
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}
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static void aopen_decusecnt(void)
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{
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ast_mutex_lock(&usecnt_lock);
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usecnt++;
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ast_mutex_unlock(&usecnt_lock);
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ast_update_use_count();
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}
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static int aopen_answer(struct ast_modem_pvt *p)
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{
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if (ast_modem_send(p, "ATA", 0) ||
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ast_modem_expect(p, "VCON", 10)) {
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ast_log(LOG_WARNING, "Unable to answer: %s", p->response);
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return -1;
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}
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return 0;
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}
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static int aopen_dialdigit(struct ast_modem_pvt *p, char digit)
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{
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char cmd[80];
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snprintf(cmd, sizeof(cmd), "AT#VTS=%c", digit);
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if (ast_modem_send(p, cmd, 0) ||
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ast_modem_expect(p, "VCON", 10)) {
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ast_log(LOG_WARNING, "Unable to answer: %s", p->response);
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return -1;
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}
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return 0;
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}
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static int aopen_dial(struct ast_modem_pvt *p, char *stuff)
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{
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char cmd[80];
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snprintf(cmd, sizeof(cmd), "ATD%c %s", p->dialtype,stuff);
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if (ast_modem_send(p, cmd, 0)) {
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ast_log(LOG_WARNING, "Unable to dial\n");
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return -1;
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}
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return 0;
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}
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static int aopen_hangup(struct ast_modem_pvt *p)
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{
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if (aopen_break(p))
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return -1;
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/* Hangup by switching to data, then back to voice */
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if (ast_modem_send(p, "ATH", 0) ||
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ast_modem_expect(p, "OK", 8)) {
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ast_log(LOG_WARNING, "Unable to set to data mode\n");
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return -1;
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}
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if (ast_modem_send(p, "AT#CLS=8", 0) ||
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ast_modem_expect(p, "OK", 5)) {
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ast_log(LOG_WARNING, "Unable to set to voice mode\n");
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return -1;
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}
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return 0;
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}
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static struct ast_modem_driver aopen_driver =
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{
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"AOpen",
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aopen_idents,
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AST_FORMAT_SLINEAR,
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0, /* Not full duplex */
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aopen_incusecnt, /* incusecnt */
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aopen_decusecnt, /* decusecnt */
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aopen_identify, /* identify */
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aopen_init, /* init */
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aopen_setdev, /* setdev */
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aopen_read,
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aopen_write,
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aopen_dial, /* dial */
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aopen_answer, /* answer */
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aopen_hangup, /* hangup */
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aopen_startrec, /* start record */
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NULL, /* stop record */
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NULL, /* start playback */
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NULL, /* stop playback */
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NULL, /* set silence supression */
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aopen_dialdigit, /* dialdigit */
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};
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int usecount(void)
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{
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int res;
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ast_mutex_lock(&usecnt_lock);
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res = usecnt;
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ast_mutex_unlock(&usecnt_lock);
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return res;
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}
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int load_module(void)
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{
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return ast_register_modem_driver(&aopen_driver);
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}
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int unload_module(void)
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{
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return ast_unregister_modem_driver(&aopen_driver);
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}
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char *description()
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{
|
|
return desc;
|
|
}
|
|
|
|
char *key()
|
|
{
|
|
return ASTERISK_GPL_KEY;
|
|
}
|