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#include "config.h"
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#if defined(HAVE_SYS_MODEM_H)
#include <sys/modem.h>
#endif /* HAVE_SYS_MODEM_H */
#include "gpsd.h"
/* Workaround for HP-UX 11.23, which is missing CRTSCTS */
#ifndef CRTSCTS
# ifdef CNEW_RTSCTS
# define CRTSCTS CNEW_RTSCTS
# else
# define CRTSCTS 0
# endif /* CNEW_RTSCTS */
#endif /* !CRTSCTS */
int gpsd_get_speed(struct termios* ttyctl)
{
int code = cfgetospeed(ttyctl);
switch (code) {
case B0: return(0);
case B300: return(300);
case B1200: return(1200);
case B2400: return(2400);
case B4800: return(4800);
case B9600: return(9600);
case B19200: return(19200);
case B38400: return(38400);
default: return(57600);
}
}
int gpsd_set_speed(struct gps_session_t *session,
unsigned int speed, unsigned int stopbits)
{
unsigned int rate;
if (speed < 300)
rate = 0;
else if (speed < 1200)
rate = B300;
else if (speed < 2400)
rate = B1200;
else if (speed < 4800)
rate = B2400;
else if (speed < 9600)
rate = B4800;
else if (speed < 19200)
rate = B9600;
else if (speed < 38400)
rate = B19200;
else if (speed < 57600)
rate = B38400;
else
rate = B57600;
tcflush(session->gNMEAdata.gps_fd, TCIOFLUSH); /* toss stale data */
if (speed!=cfgetispeed(&session->ttyset) || stopbits!=session->gNMEAdata.stopbits) {
cfsetispeed(&session->ttyset, (speed_t)rate);
cfsetospeed(&session->ttyset, (speed_t)rate);
session->ttyset.c_cflag &=~ CSIZE;
session->ttyset.c_cflag |= (CSIZE & (stopbits==2 ? CS7 : CS8));
if (tcsetattr(session->gNMEAdata.gps_fd, TCSANOW, &session->ttyset) != 0)
return 0;
tcflush(session->gNMEAdata.gps_fd, TCIOFLUSH);
}
if ((session->packet_type = packet_sniff(session)) == BAD_PACKET)
return 0;
if (session->packet_type == SIRF_PACKET)
gpsd_switch_driver(session, 's');
session->gNMEAdata.stopbits = stopbits;
session->gNMEAdata.baudrate = speed;
return 1;
}
int gpsd_open(struct gps_session_t *session)
{
unsigned int *ip;
unsigned int stopbits;
/* every rate we're likely to see on a GPS */
static unsigned int rates[] = {4800, 9600, 19200, 38400, 57600};
gpsd_report(1, "opening GPS data source at %s\n", session->gpsd_device);
if ((session->gNMEAdata.gps_fd = open(session->gpsd_device, O_RDWR|O_NOCTTY|O_SYNC)) < 0)
return -1;
if (isatty(session->gNMEAdata.gps_fd)) {
#ifdef NON_NMEA_ENABLE
if ( session->device_type && (session->device_type->typekey == 'g')) {
// IFF Garmin then skip the rest of the IO stuff
// The Linux Garmin driver ignores all baud rate, stop bits, etc.
return session->gNMEAdata.gps_fd;
}
#endif /* NON_NMEA_ENABLE */
/* Save original terminal parameters */
if (tcgetattr(session->gNMEAdata.gps_fd,&session->ttyset_old) != 0)
return -1;
memcpy(&session->ttyset,&session->ttyset_old,sizeof(session->ttyset));
/*
* Tip from Chris Kuethe: the FIDI chip used in the Trip-Nav
* 200 (and possibly other USB GPSes) gets completely hosed
* in the presence of flow control. Thus, turn off CRTSCTS.
*/
session->ttyset.c_cflag &= ~(PARENB | CRTSCTS);
session->ttyset.c_cflag |= CREAD | CLOCAL;
session->ttyset.c_iflag = session->ttyset.c_oflag = session->ttyset.c_lflag = (tcflag_t) 0;
session->ttyset.c_oflag = (ONLCR);
if (session->gNMEAdata.baudrate) {
gpsd_report(1, "setting speed %d, %d stopbits, no parity\n",
session->gNMEAdata.baudrate,
session->gNMEAdata.stopbits);
if (gpsd_set_speed(session, session->gNMEAdata.baudrate, session->gNMEAdata.stopbits)) {
return session->gNMEAdata.gps_fd;
}
}
for (stopbits = 1; stopbits <= 2; stopbits++)
for (ip = rates; ip < rates + sizeof(rates)/sizeof(rates[0]); ip++)
if (*ip != session->gNMEAdata.baudrate || stopbits != session->gNMEAdata.stopbits) {
gpsd_report(1,
"hunting at speed %d, %dN%d\n",
*ip, 9-stopbits, stopbits);
if (gpsd_set_speed(session, *ip, stopbits))
return session->gNMEAdata.gps_fd;
}
session->gNMEAdata.gps_fd = -1;
}
return session->gNMEAdata.gps_fd;
}
void gpsd_close(struct gps_session_t *session)
{
if (session->gNMEAdata.gps_fd != -1) {
if (isatty(session->gNMEAdata.gps_fd)) {
/* force hangup on close on systems that don't do HUPCL properly */
cfsetispeed(&session->ttyset, (speed_t)B0);
cfsetospeed(&session->ttyset, (speed_t)B0);
tcsetattr(session->gNMEAdata.gps_fd, TCSANOW, &session->ttyset);
}
/* this is the clean way to do it */
session->ttyset_old.c_cflag |= HUPCL;
tcsetattr(session->gNMEAdata.gps_fd,TCSANOW,&session->ttyset_old);
close(session->gNMEAdata.gps_fd);
}
}
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