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/* $Id: plugin_dvb.c,v 1.2 2004/02/16 13:03:37 reinelt Exp $
*
* plugin for DVB status
*
* Copyright 2003 Michael Reinelt <reinelt@eunet.at>
* Copyright 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* This file is part of LCD4Linux.
*
* LCD4Linux 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, or (at your option)
* any later version.
*
* LCD4Linux 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.
*
*
* $Log: plugin_dvb.c,v $
* Revision 1.2 2004/02/16 13:03:37 reinelt
* compile problem with missing frontend.h fixed
*
* Revision 1.1 2004/02/10 06:54:39 reinelt
* DVB plugin ported
*
*/
/*
* exported functions:
*
* int plugin_init_dvb (void)
* adds dvb() function
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <asm/types.h>
#ifdef HAVE_LINUX_DVB_FRONTEND_H
#include <linux/dvb/frontend.h>
#else
#warning linux/dvb/frontend.h not found: using hardcoded ioctl definitions
#define FE_READ_BER _IOR('o', 70, __u32)
#define FE_READ_SIGNAL_STRENGTH _IOR('o', 71, __u16)
#define FE_READ_SNR _IOR('o', 72, __u16)
#define FE_READ_UNCORRECTED_BLOCKS _IOR('o', 73, __u32)
#endif
#include "debug.h"
#include "plugin.h"
#include "hash.h"
static char *frontend="/dev/dvb/adapter0/frontend0";
static HASH DVB = { 0, };
static int get_dvb_stats (void)
{
int age;
int fd;
unsigned short snr, sig;
unsigned long ber, ucb;
char val[16];
// reread every 1000 msec only
age=hash_age(&DVB, NULL, NULL);
if (age>0 && age<=1000) return 0;
// open frontend
fd = open(frontend, O_RDONLY);
if (fd==-1) {
error ("open(%s) failed: %s", frontend, strerror(errno));
return -1;
}
if (ioctl(fd, FE_READ_SIGNAL_STRENGTH, &sig)!=0) {
error("ioctl(FE_READ_SIGNAL_STRENGTH) failed: %s", strerror(errno));
sig=0;
}
if (ioctl(fd, FE_READ_SNR, &snr)!=0) {
error("ioctl(FE_READ_SNR) failed: %s", strerror(errno));
snr=0;
}
if (ioctl(fd, FE_READ_BER, &ber)!=0) {
error("ioctl(FE_READ_BER) failed: %s", strerror(errno));
ber=0;
}
if (ioctl(fd, FE_READ_UNCORRECTED_BLOCKS, &ucb)!=0) {
error("ioctl(FE_READ_UNCORRECTED_BLOCKS) failed: %s", strerror(errno));
ucb=0;
}
close (fd);
snprintf (val, sizeof(val), "%f", sig/65535.0);
hash_set (&DVB, "signal_strength", val);
snprintf (val, sizeof(val), "%f", snr/65535.0);
hash_set (&DVB, "snr", val);
snprintf (val, sizeof(val), "%lu", ber);
hash_set (&DVB, "ber", val);
snprintf (val, sizeof(val), "%lu", ucb);
hash_set (&DVB, "uncorrected_blocks", val);
return 0;
}
static void my_dvb (RESULT *result, RESULT *arg1)
{
char *val;
if (get_dvb_stats()<0) {
SetResult(&result, R_STRING, "");
return;
}
val=hash_get(&DVB, R2S(arg1));
if (val==NULL) val="";
SetResult(&result, R_STRING, val);
}
int plugin_init_dvb (void)
{
AddFunction ("dvb", 3, my_dvb);
return 0;
}
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