/* $Id: plugin_dvb.c,v 1.6 2004/06/26 09:27:21 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 1.6  2004/06/26 09:27:21  reinelt
 *
 * added '-W' to CFLAGS
 * changed all C++ comments to C ones ('//' => '/* */')
 * cleaned up a lot of signed/unsigned mistakes
 *
 * Revision 1.5  2004/06/17 06:23:43  reinelt
 *
 * hash handling rewritten to solve performance issues
 *
 * Revision 1.4  2004/03/14 07:11:42  reinelt
 * parameter count fixed for plugin_dvb()
 * plugin_APM (battery status) ported
 *
 * Revision 1.3  2004/03/03 03:47:04  reinelt
 * big patch from Martin Hejl:
 * - use qprintf() where appropriate
 * - save CPU cycles on gettimeofday()
 * - add quit() functions to free allocated memory
 * - fixed lots of memory leaks
 *
 * 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;

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);
  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_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);
}