package/libtapi/src/dialdetector.c

   1 #include <linux/input.h>
   2 #include <sys/epoll.h>
   3 #include <stdint.h>
   4 #include <stdbool.h>
   5
   6
   7 #include <stdlib.h>
   8 #include <stdio.h>
   9
  10 #include "events.h"
  11 #include "timerfd.h"
  12
  13 #include "tapi-port.h"
  14 #include "dialdetector.h"
  15
  16 static const struct itimerspec dialdetector_timeout = {
  17         .it_value.tv_sec = 3,
  18 };
  19
  20 static void dialdetector_note_digit(struct dialdetector *d, unsigned char digit)
  21 {
  22         printf("note digit: %d\n", d->num_digits);
  23         d->digits[d->num_digits] = digit;
  24         ++d->num_digits;
  25 }
  26
  27 static void dialdetector_reset(struct dialdetector *d)
  28 {
  29         event_unregister(d->timer_fd);
  30         d->num_digits = 0;
  31         d->state = DIALDETECTOR_IDLE;
  32 }
  33
  34 static bool dialdetector_timeout_event(int events, void *data)
  35 {
  36         char num[20];
  37         struct dialdetector *dialdetector = data;
  38         int i;
  39
  40         for (i = 0; i < dialdetector->num_digits; ++i) {
  41                 num[i] = '0' + dialdetector->digits[i];
  42         }
  43         num[i] = '\0';
  44
  45         printf("Dialing: %s\n", num);
  46         dialdetector->dial_callback(dialdetector->port, dialdetector->num_digits,
  47         dialdetector->digits);
  48
  49         dialdetector_reset(dialdetector);
  50
  51         return false;
  52 }
  53
  54 static void dialdetector_port_event(struct tapi_port *port,
  55         struct tapi_event *event, void *data)
  56 {
  57         struct dialdetector *d = data;
  58
  59         printf("port event: %d %d\n", d->state, event->hook.on);
  60
  61         switch (d->state) {
  62         case DIALDETECTOR_IDLE:
  63                 if (event->type == TAPI_EVENT_TYPE_HOOK && event->hook.on == false) {
  64                         d->state = DIALDETECTOR_WAIT_FOR_NUMBER;
  65                         event_register(d->timer_fd, EPOLLIN, &d->timeout_cb);
  66                         timerfd_settime(d->timer_fd, 0, &dialdetector_timeout, NULL);
  67                 }
  68                 break;
  69         case DIALDETECTOR_WAIT_FOR_NUMBER:
  70         case DIALDETECTOR_WAIT_FOR_NUMBER_TIMEOUT:
  71                 switch (event->type) {
  72                 case TAPI_EVENT_TYPE_HOOK:
  73                         if (event->hook.on == true)
  74                                 dialdetector_reset(d);
  75                         break;
  76                 case TAPI_EVENT_TYPE_DTMF:
  77                         if (d->state == DIALDETECTOR_WAIT_FOR_NUMBER)
  78                                 event_register(d->timer_fd, EPOLLIN, &d->timeout_cb);
  79                         timerfd_settime(d->timer_fd, 0, &dialdetector_timeout, NULL);
  80                         d->state = DIALDETECTOR_WAIT_FOR_NUMBER_TIMEOUT;
  81                         dialdetector_note_digit(d, event->dtmf.code);
  82                         break;
  83                 default:
  84                         break;
  85                 }
  86         }
  87 }
  88
  89 struct dialdetector *dialdetector_alloc(struct tapi_port *port)
  90 {
  91         struct dialdetector *dialdetector;
  92         dialdetector = malloc(sizeof(*dialdetector));
  93
  94         dialdetector->timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
  95         dialdetector->port = port;
  96         dialdetector->num_digits = 0;
  97         dialdetector->state = DIALDETECTOR_IDLE;
  98
  99         dialdetector->timeout_cb.callback = dialdetector_timeout_event;
 100         dialdetector->timeout_cb.data = dialdetector;
 101
 102         dialdetector->port_listener.callback = dialdetector_port_event;
 103         dialdetector->port_listener.data = dialdetector;
 104
 105         tapi_port_register_event(port, &dialdetector->port_listener);
 106
 107
 108         return dialdetector;
 109 }