/* $Id: drv_generic.c,v 1.2 2004/01/20 05:36:59 reinelt Exp $
 *
 * generic driver helper for text- and graphic-based displays
 *
 * Copyright 1999, 2000 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: drv_generic.c,v $
 * Revision 1.2  2004/01/20 05:36:59  reinelt
 * moved text-display-specific stuff to drv_generic_text
 * moved all the bar stuff from drv_generic_bar to generic_text
 *
 * Revision 1.1  2004/01/20 04:51:39  reinelt
 * moved generic stuff from drv_MatrixOrbital to drv_generic
 * implemented new-stylish bars which are nearly finished
 *
 */

/* 
 *
 * exported fuctions:
 *
 * Fixme: document me!
 *
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>

#include "debug.h"
#include "cfg.h"
#include "plugin.h"
#include "lock.h"
#include "widget.h"
#include "widget_text.h"
#include "widget_bar.h"
#include "drv.h"
#include "drv_generic.h"


static char   *Driver;
static char   *Port;
static speed_t Speed;
static int     Device=-1;


// ****************************************
// *** generic serial/USB communication ***
// ****************************************

int drv_generic_serial_open (char *driver, char *port, speed_t speed)
{
  int fd;
  pid_t pid;
  struct termios portset;
  
  Driver = driver;
  Port   = port;
  Speed  = speed;
  
  if ((pid=lock_port(port))!=0) {
    if (pid==-1)
      error ("%s: port %s could not be locked", Driver, Port);
    else
      error ("%s: port %s is locked by process %d", Driver, Port, pid);
    return -1;
  }

  fd = open(Port, O_RDWR | O_NOCTTY | O_NDELAY); 
  if (fd==-1) {
    error ("%s: open(%s) failed: %s", Driver, Port, strerror(errno));
    unlock_port(Port);
    return -1;
  }

  if (tcgetattr(fd, &portset)==-1) {
    error ("%s: tcgetattr(%s) failed: %s", Driver, Port, strerror(errno));
    unlock_port(Port);
    return -1;
  }

  cfmakeraw(&portset);
  cfsetospeed(&portset, Speed);
  if (tcsetattr(fd, TCSANOW, &portset)==-1) {
    error ("%s: tcsetattr(%s) failed: %s", Driver, Port, strerror(errno));
    unlock_port(Port);
    return -1;
  }
  
  Device=fd;
  return Device;
}


int drv_generic_serial_read (char *string, int len)
{
  int run, ret;
  
  if (Device==-1) return -1;
  for (run=0; run<10; run++) {
    ret=read (Device, string, len);
    if (ret>=0 || errno!=EAGAIN) break;
    debug ("read(): EAGAIN");
    usleep(1000);
  }
  
  if (ret<0) {
    error("%s: read(%s, %d) failed: %s", Driver, Port, len, strerror(errno));
  } else if (ret!=len) {
    error ("%s: partial read: len=%d ret=%d", Driver, len, ret);
  }
  
  return ret;
}


void drv_generic_serial_write (char *string, int len)
{
  int run, ret;
  
  if (Device==-1) return;
  for (run=0; run<10; run++) {
    ret=write (Device, string, len);
    if (ret>=0 || errno!=EAGAIN) break;
    debug ("write(): EAGAIN");
    usleep(1000);
  }
  
  if (ret<0) {
    error ("MatrixOrbital: write(%s) failed: %s", Port, strerror(errno));
  } else if (ret!=len) {
    error ("MatrixOrbital: partial write: len=%d ret=%d", len, ret);
  }
  
  return;
}


int drv_generic_serial_close (void)
{
  debug ("%s: closing port %s", Driver, Port);
  close (Device);
  unlock_port(Port);
  return 0;
}