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/*
at89prog
(c) 2003-2004 Jelmer Vernooij <jelmer@samba.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include "pins.h"
#include <sys/termios.h>
#include <signal.h>
#include <sys/types.h>
#include <string.h>
#include <sys/io.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
static int fd = 0;
#define SER_PIN_TXD 0
#define SER_PIN_DTR 1
#define SER_PIN_DSR 2
#define SER_PIN_RTS 3
#define SER_PIN_CTS 4
static char *available_pins[] = { "TXD", "DTR", "DSR", "RTS", "CTS", NULL };
static int ser_init(char *location)
{
fd = open(location?location:"/dev/ttyS0", O_RDWR | O_NOCTTY);
if(fd < 0) {
perror("Error opening serial port");
return -1;
}
return 0;
}
static int ser_close()
{
close(fd);
return 0;
}
static void ser_set(int p)
{
int status;
if(ioctl (fd, TIOCMGET, &status) < 0) {
perror("ioctl");
return;
}
switch(p) {
case SER_PIN_TXD:
if(ioctl (fd, TIOCSBRK, 0) < 0) perror("ioctl");
break;
case SER_PIN_DTR: status |= TIOCM_DTR; break;
case SER_PIN_DSR: status |= TIOCM_LE; break;
case SER_PIN_RTS: status |= TIOCM_RTS; break;
case SER_PIN_CTS: status |= TIOCM_CTS; break;
}
if(ioctl (fd, TIOCMSET, &status) < 0) perror("ioctl");
}
static void ser_clear(int p)
{
int status;
if(ioctl (fd, TIOCMGET, &status) < 0) {
perror("ioctl");
return;
}
switch(p) {
case SER_PIN_TXD:
if(ioctl (fd, TIOCCBRK, 0) < 0) perror("ioctl");
break;
case SER_PIN_DTR: status &=~TIOCM_DTR; break;
case SER_PIN_DSR: status &=~TIOCM_LE; break;
case SER_PIN_RTS: status &=~TIOCM_RTS; break;
case SER_PIN_CTS: status &=~TIOCM_CTS; break;
default:
fprintf(stderr, "Write not available for pin %s\n", available_pins[p]);
break;
}
if(ioctl (fd, TIOCMSET, &status) < 0) perror("ioctl");
}
static int ser_get(int p)
{
int status;
if(ioctl(fd, TIOCMGET, &status) < 0) perror("ioctl");
switch(p) {
case SER_PIN_DTR: return (status & TIOCM_DTR?1:0);
case SER_PIN_RTS: return (status & TIOCM_RTS?1:0);
case SER_PIN_DSR: return (status & TIOCM_DSR?1:0);
case SER_PIN_CTS: return (status & TIOCM_CTS?0:1);
default:
fprintf(stderr, "Read not available for pin %s\n", available_pins[p]);
return -1;
}
}
struct pins_backend serial = {
"serial",
available_pins,
ser_init,
ser_set,
ser_clear,
ser_get,
ser_close
};
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