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/*****************************************************************************/
/*
* ppdevinit.c -- Parport access via Linux PPDEV device (init routines).
*
* Copyright (C) 1998-1999 Thomas Sailer (sailer@ife.ee.ethz.ch)
*
* 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.
*
* Please note that the GPL allows you to use the driver, NOT the radio.
* In order to use the radio, you need a license from the communications
* authority of your country.
*
*/
/*****************************************************************************/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "parport.h"
#include "fpga.h"
#include "ppdev.h"
/* ---------------------------------------------------------------------- */
extern int pp_dev_fd;
extern int pp_dev_mode;
extern const struct parport_ops parport_dev_ops;
extern void parport_dev_exit(void);
/* ---------------------------------------------------------------------- */
int parport_init_ppdev(const char *path)
{
int datadir = 0;
if ((pp_dev_fd = open(path, O_RDWR | O_NONBLOCK)) == -1) {
lprintf(0, "Cannot open ppdev device %s (error %s)\n", path,
strerror(errno));
return -1;
}
if (ioctl(pp_dev_fd, PPEXCL, 0)) {
lprintf(0, "Cannot set exclusive mode on ppdev device %s (error %s)\n", path,
strerror(errno));
goto err;
}
if (ioctl(pp_dev_fd, PPCLAIM, 0)) {
lprintf(0, "Cannot claim ppdev device %s (error %s)\n", path,
strerror(errno));
goto err;
}
pp_dev_mode = IEEE1284_MODE_COMPAT;
if (ioctl(pp_dev_fd, PPSETMODE, &pp_dev_mode)) {
lprintf(0, "Cannot set mode on ppdev device %s (error %s)\n", path,
strerror(errno));
goto err;
}
if (ioctl(pp_dev_fd, PPDATADIR, &datadir)) {
lprintf(0, "Cannot set data direction on ppdev device %s (error %s)\n", path,
strerror(errno));
goto err;
}
if (atexit(parport_dev_exit)) {
lprintf(0, "Cannot install atexit handler (error %s)\n", strerror(errno));
goto errrelease;
}
parport_ops = parport_dev_ops;
return 0;
errrelease:
ioctl(pp_dev_fd, PPRELEASE, 0);
err:
close(pp_dev_fd);
pp_dev_fd = -1;
return -1;
}
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