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/* $Id: plugin_dvb.c 939 2009-01-04 14:14:31Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_dvb.c $
*
* plugin for DVB status
*
* Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 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.
*
*/
/*
* 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;
static int get_dvb_stats(void)
{
static int ioc_disable = 0;
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);
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;
}
sig = 0;
if ((ioc_disable & 0x01) == 0 && ioctl(fd, FE_READ_SIGNAL_STRENGTH, &sig) != 0) {
error("ioctl(FE_READ_SIGNAL_STRENGTH) failed: %s", strerror(errno));
if (errno == ENOSYS) {
ioc_disable |= 0x01;
error("ioctl(FE_READ_SIGNAL_STRENGTH) disabled.");
}
}
snr = 0;
if ((ioc_disable & 0x02) == 0 && ioctl(fd, FE_READ_SNR, &snr) != 0) {
error("ioctl(FE_READ_SNR) failed: %s", strerror(errno));
if (errno == ENOSYS) {
ioc_disable |= 0x02;
error("ioctl(FE_READ_SNR) disabled.");
}
}
ber = 0;
if ((ioc_disable & 0x04) == 0 && ioctl(fd, FE_READ_BER, &ber) != 0) {
error("ioctl(FE_READ_BER) failed: %s", strerror(errno));
if (errno == ENOSYS) {
ioc_disable |= 0x04;
error("ioctl(FE_READ_BER) disabled.");
}
}
ucb = 0;
if ((ioc_disable & 0x08) == 0 && ioctl(fd, FE_READ_UNCORRECTED_BLOCKS, &ucb) != 0) {
error("ioctl(FE_READ_UNCORRECTED_BLOCKS) failed: %s", strerror(errno));
if (errno == ENOSYS) {
ioc_disable |= 0x08;
error("ioctl(FE_READ_UNCORRECTED_BLOCKS) disabled.");
}
}
close(fd);
snprintf(val, sizeof(val), "%f", sig / 65535.0);
hash_put(&DVB, "signal_strength", val);
snprintf(val, sizeof(val), "%f", snr / 65535.0);
hash_put(&DVB, "snr", val);
snprintf(val, sizeof(val), "%lu", ber);
hash_put(&DVB, "ber", val);
snprintf(val, sizeof(val), "%lu", ucb);
hash_put(&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), NULL);
if (val == NULL)
val = "";
SetResult(&result, R_STRING, val);
}
int plugin_init_dvb(void)
{
hash_create(&DVB);
AddFunction("dvb", 1, my_dvb);
return 0;
}
void plugin_exit_dvb(void)
{
hash_destroy(&DVB);
}
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