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/* interface.c
* Contains detection routines for the kernel interface to the card.
*/
/* (c) 1998-2000 by Keith Wesolowski (wesolows@foobazco.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 <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/videodev.h>
#include "gradio.h"
extern radio_status gr_stat;
void gradio_get_interface (void)
{
/* First determine whether we can use the kernel interface */
int fd;
struct video_tuner vt;
double fact;
if ((fd = open (gr_stat.dev_name, O_RDONLY)) > 0) {
gr_stat.fd = fd;
vt.tuner = 0;
fact = gradio_get_freq_fact ();
if (ioctl (fd, VIDIOCGTUNER, &vt)) {
gr_stat.freq_max = GR_FREQ_MAX;
gr_stat.freq_min = GR_FREQ_MIN;
} else {
#ifdef OVERRIDE_FREQ
gr_stat.freq_max = GR_FREQ_MAX;
gr_stat.freq_min = GR_FREQ_MIN;
#else
gr_stat.freq_max = (int)(vt.rangehigh / fact);
gr_stat.freq_min = (int)(vt.rangelow / fact);
#endif
}
} else {
perror(gr_stat.dev_name);
exit (1);
}
}
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