/*
 * This module implements the guts of OS-specific serial port handling
 * for our fc-sim-tools serial back end.  The present version is very
 * Linux-specific, using Linux-specific <asm/...> header files,
 * struct termios2 and BOTHER to request arbitrary serial baud rates
 * outside of POSIX Bxxx rigid set.
 */

#include <sys/types.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <asm/ioctls.h>
#include <asm/termbits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int target_fd;

open_serial_port(ttyport)
	char *ttyport;
{
	target_fd = open(ttyport, O_RDWR|O_NONBLOCK);
	if (target_fd < 0) {
		perror(ttyport);
		exit(1);
	}
	ioctl(target_fd, TIOCEXCL);
	return 0;
}

set_serial_params(bps, parity)
{
	struct termios2 target_termios;

	target_termios.c_iflag = IGNBRK|IGNPAR;
	target_termios.c_oflag = 0;
	target_termios.c_cflag = BOTHER|CLOCAL|HUPCL|CREAD|CS8|CSTOPB|PARENB;
	if (parity == 1)
		target_termios.c_cflag |= PARODD;
	target_termios.c_lflag = 0;
	target_termios.c_cc[VMIN] = 1;
	target_termios.c_cc[VTIME] = 0;
	target_termios.c_ispeed = bps;
	target_termios.c_ospeed = bps;
	if (ioctl(target_fd, TCSETSF2, &target_termios) < 0) {
		perror("TCSETSF2");
		exit(1);
	}
	return 0;
}

set_serial_nonblock(state)
	int state;
{
	ioctl(target_fd, FIONBIO, &state);
}

serial_card_reset()
{
	int mctl_arg = TIOCM_DTR | TIOCM_RTS;

	ioctl(target_fd, TIOCMBIS, &mctl_arg);
	usleep(20000);
	ioctl(target_fd, TCFLSH, TCIFLUSH);
	ioctl(target_fd, TIOCMBIC, &mctl_arg);
}