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/* irio.c v0.4.2 (c) 1998-99 Tom Wheeley <tomw@tsys.demon.co.uk> */
/* this code is placed under the LGPL, see www.gnu.org for info */
/*
* irio.c, Irman infrared controller interface
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/file.h>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#ifdef HAVE_SYS_FILE_H
# include <sys/file.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifdef HAVE_SYS_FLOCK_H
# include <sys/flock.h>
#endif
#ifdef HAVE_TERMIOS_H
# include <termios.h>
#endif
#include <sys/ioctl.h>
#include "irman.h"
/* wrapper for ir_close_port() for use by atexit() */
static RETSIGTYPE ir_close_port_on_exit(void) { (void) ir_close_port(); }
static int portfd=0;
static int portflags=0;
static int oldflags=0;
static struct termios oldterm;
static struct termios portterm;
/*
* Note regarding terminal settings.
*
* These work on my system. I am quite confident they will work on other
* systems. The termios setup code is originally from another program
* designed to talk to a serial device (casio diary) written by someone who I
* can't remember but I presume they knew what they were doing.
*
* More information on Unix serial port programming can be obtained from
* http://www.easysw.com/~mike/serial/index.html
*
*/
/*
* Ignore the things in SUNATTEMPT. They're not even needed for a Sun.
*/
int ir_open_port(char *filename)
{
int status;
int parnum = 0;
int hand = TIOCM_DTR | TIOCM_RTS;
int baudrate=B9600;
/* get a file descriptor */
if ((portfd=open(filename, O_RDWR | O_NOCTTY | O_NDELAY)) < 0) {
return -1;
}
/* check to see that the file is a terminal */
if (!isatty(portfd)) {
close(portfd);
portfd = 0;
return -1;
}
/* lock the file for ourselves */
if (flock(portfd, LOCK_EX | LOCK_NB) < 0) {
/* unable to get lock */
close(portfd);
portfd = 0;
return -1;
}
/* get port attributes, store in oldterm */
if (tcgetattr(portfd, &oldterm) < 0) {
close(portfd);
portfd = 0;
return -1;
}
/* get port flags, save in oldflags */
if ((oldflags = fcntl(portfd, F_GETFL)) < 0) {
close(portfd);
portfd = 0;
return -1;
}
/* now we have read the old attributes for the port, we can restore them
* upon exit. if we had done this bfore, and exited beore reading in the
* old attributes, we would have overwritten the old settings with zeros.
*
* this way, if we do exit before we get here, we simply rely on the OS closing
* the port for us, which is fine as we haven't changed anything yet.
*/
atexit(ir_close_port_on_exit);
/* copy old attrs into new structure */
portterm = oldterm;
portflags = oldflags;
/* remove old parity setting, size and stop setting */
portterm.c_cflag &= ~PARENB;
portterm.c_cflag &= ~PARODD;
portterm.c_cflag &= ~CSTOPB;
portterm.c_cflag &= ~CSIZE;
/* set character size, stop bits and parity */
portterm.c_cflag |= CS8;
portterm.c_cflag |= parnum;
/* enable receiver, and don't change ownership */
portterm.c_cflag |= CREAD | CLOCAL;
/* disable flow control */
#ifdef CNEW_RTSCTS
portterm.c_cflag &= ~CNEW_RTSCTS;
#else
#ifdef CRTSCTS
portterm.c_cflag &= ~CRTSCTS;
#endif
#ifdef CRTSXOFF
portterm.c_cflag &= ~CRTSXOFF;
#endif
#endif
/* read characters immediately in non-canonical mode */
/* Thanks to Bill Ryder, <bryder@sgi.com> */
portterm.c_cc[VMIN] = 1;
portterm.c_cc[VTIME] = 1;
/* set the input and output baud rate */
cfsetispeed(&portterm, baudrate);
cfsetospeed(&portterm, baudrate);
/* set non-canonical mode (we don't want any fancy terminal processing!) */
portterm.c_lflag = 0;
/* Ignore breaks and make terminal raw and dumb. */
portterm.c_iflag = 0;
portterm.c_iflag |= IGNBRK;
portterm.c_oflag &= ~OPOST;
/* now clean the serial line and activate the new settings */
tcflush(portfd, TCIOFLUSH);
if (tcsetattr(portfd, TCSANOW, &portterm) < 0) {
close(portfd);
portfd = 0;
return -1;
}
/* set non-blocking */
if (fcntl(portfd, F_SETFL, (portflags |= O_NONBLOCK)) < 0) {
/* we've got this far -- we now have to restore old settings */
ir_close_port();
return -1;
}
/* we power down the device */
if(ioctl(portfd, TIOCMGET, &status) < 0)
{
perror("could not get status\n");
return -1;
}
status &= ~hand;
if(ioctl(portfd, TIOCMSET, &status) < 0)
{
perror("could not set power down");
return -1;
}
tcdrain(portfd);
ir_usleep(IR_POWER_OFF_LATENCY);
/* now power up again */
status |= hand;
if(ioctl(portfd, TIOCMSET, &status) < 0)
{
perror("could not set power up");
return -1;
}
tcdrain(portfd);
/* wait a little while for everything to settle through */
ir_usleep(IR_POWER_ON_LATENCY);
/* flush serial fifo */
tcflush(portfd, TCIOFLUSH);
return portfd;
}
/* close the port, restoring old settings */
int ir_close_port(void)
{
int retval = 0;
if (!portfd) { /* already closed */
errno = EBADF;
return -1;
}
/* restore old settings */
if (tcsetattr(portfd, TCSADRAIN, &oldterm) < 0) {
retval = -1;
}
if (fcntl(portfd, F_SETFL, oldflags) < 0) {
retval = -1;
}
close(portfd);
portfd=0;
return retval;
}
/* write a character. nothing interesting happens here */
int ir_write_char(unsigned char data)
{
if (write (portfd, &data, 1) != 1)
return -1;
else {
#ifdef DEBUG_COMM
printf("{%02x}", data);fflush(stdout);
#endif
return 0;
}
}
/* read a character, with a timeout.
* timeout < 0 - block indefinitely
* timeout = 0 - return immediately
* timeout > 0 - timeout after `timeout' microseconds
* use the nice macros in irman.h to define sec, msec, usec
*/
int ir_read_char(long timeout)
{
unsigned char rdchar;
int ok;
fd_set rdfds;
struct timeval tv;
FD_ZERO(&rdfds);
FD_SET(portfd, &rdfds);
/* block until something to read or timeout occurs. select() is damn cool */
if (timeout < 0) {
ok = select(portfd + 1, &rdfds, NULL, NULL, NULL);
} else {
tv.tv_sec=timeout / 1000000;
tv.tv_usec=(timeout % 1000000);
ok = select(portfd + 1, &rdfds, NULL, NULL, &tv);
}
if (ok > 0) {
ok = read(portfd, &rdchar, 1);
if (ok == 0) {
return EOF;
}
#ifdef COMM_DEBUG
printf("[%02x]", rdchar);fflush(stdout);
#endif
return rdchar;
} else if (ok < 0) {
return EOF-1;
} else {
errno = ETIMEDOUT;
return EOF-1;
}
return 0;
}
/* just about the only function where we don't care about errors! */
void ir_clear_buffer(void)
{
while (ir_read_char(IR_GARBAGE_TIMEOUT) >= 0)
;
}
/* some systems have it, some systems don't. This just makes life easier,
* hence I have left this function visible (also for irfunc.c)
*/
void ir_usleep(unsigned long usec)
{
struct timeval tv;
tv.tv_sec=usec / 1000000;
tv.tv_usec=(usec % 1000000);
(void) select(0, NULL, NULL, NULL, &tv);
}
/* end of irio.c */
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