/* $Id: parport.c,v 1.13 2004/01/13 08:18:20 reinelt Exp $
 *
 * generic parallel port handling
 *
 * Copyright 2003 Michael Reinelt <reinelt@eunet.at>
 *
 * 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: parport.c,v $
 * Revision 1.13  2004/01/13 08:18:20  reinelt
 * timer queues added
 * liblcd4linux deactivated turing transformation to new layout
 *
 * Revision 1.12  2004/01/09 04:16:06  reinelt
 * added 'section' argument to cfg_get(), but NULLed it on all calls by now.
 *
 * Revision 1.11  2003/10/08 14:21:10  reinelt
 * Changelog; small type in parport.c
 *
 * Revision 1.10  2003/10/05 17:58:50  reinelt
 * libtool junk; copyright messages cleaned up
 *
 * Revision 1.9  2003/10/03 03:53:12  reinelt
 * compile error in parport fixed (thanks to Andrew from FilmCan)
 *
 * Revision 1.8  2003/09/09 06:54:43  reinelt
 * new function 'cfg_number()'
 *
 * Revision 1.7  2003/08/24 05:17:58  reinelt
 * liblcd4linux patch from Patrick Schemitz
 *
 * Revision 1.6  2003/08/22 03:45:09  reinelt
 * bug in parallel port code fixed, more icons stuff
 *
 * Revision 1.5  2003/08/19 05:23:55  reinelt
 * HD44780 dual-controller patch from Jesse Brook Kovach
 *
 * Revision 1.4  2003/08/16 07:31:35  reinelt
 * double buffering in all drivers
 *
 * Revision 1.3  2003/08/15 07:54:07  reinelt
 * HD44780 4 bit mode implemented
 *
 * Revision 1.2  2003/04/07 06:03:05  reinelt
 * further parallel port abstraction
 *
 * Revision 1.1  2003/04/04 06:02:03  reinelt
 * new parallel port abstraction scheme
 *
 */

/* 
 * exported functions:
 * 
 * int parport_open (void)
 *   reads 'Port' entry from config and opens
 *   the parallel port
 *   returns 0 if ok, -1 on failure
 *
 * int parport_close (void)
 *   closes parallel port
 *   returns 0 if ok, -1 on failure
 *
 * unsigned char parport_wire_ctrl (char *name, char *deflt)
 *   reads wiring for one control signal from config
 *   returns PARPORT_CONTROL_* or 255 on error
 *
 * unsigned char parport_wire_data (char *name, char *deflt)
 *   reads wiring for one data signal from config
 *   returns 1<<bitpos or 255 on error
 *
 * void parport_direction (int direction)
 *   0 - write to parport
 *   1 - read from parport
 *
 * void parport_control (unsigned char mask, unsigned char value)
 *   frob<style>pre { line-height: 125%; }
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.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */</style><div class="highlight"><pre><span></span># automatically generated from http://www.digitv.fi/sivu.asp?path=1;8224;9519
# T freq bw fec_hi fec_lo mod transmission-mode guard-interval hierarchy
T 722000000 8MHz 2/3 NONE QAM64 8k 1/8 NONE
T 658000000 8MHz 2/3 NONE QAM64 8k 1/8 NONE
</pre></div>
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 signal affected?
  // Note: this may happen in case a signal is hardwired to GND
  if (mask==0) return;

  // Strobe, Select and AutoFeed are inverted!
  value = mask & (value ^ (PARPORT_CONTROL_STROBE|PARPORT_CONTROL_SELECT|PARPORT_CONTROL_AUTOFD));

#ifdef WITH_PPDEV
  if (PPdev) {
    struct ppdev_frob_struct frob;
    frob.mask=mask;
    frob.val=value;
    ioctl (PPfd, PPFCONTROL, &frob);
  } else
#endif
    {
      // code stolen from linux/parport_pc.h
      ctr = (ctr & ~mask) ^ value;
      outb (ctr, Port+2);
    }
}


void parport_toggle (unsigned char bits, int level, int delay)
{
  unsigned char value1, value2;

  // any signal affected?
  // Note: this may happen in case a signal is hardwired to GND
  if (bits==0) return;

  // prepare value
  value1=level?bits:0;
  value2=level?0:bits;
  
  // Strobe, Select and AutoFeed are inverted!
  value1 = bits & (value1 ^ (PARPORT_CONTROL_STROBE|PARPORT_CONTROL_SELECT|PARPORT_CONTROL_AUTOFD));
  value2 = bits & (value2 ^ (PARPORT_CONTROL_STROBE|PARPORT_CONTROL_SELECT|PARPORT_CONTROL_AUTOFD));
  
 
#ifdef WITH_PPDEV
  if (PPdev) {
    struct ppdev_frob_struct frob;
    frob.mask=bits;
    
    // rise
    frob.val=value1;
    ioctl (PPfd, PPFCONTROL, &frob);
    
    // pulse width
    ndelay(delay);      
    
    // lower
    frob.val=value2;
    ioctl (PPfd, PPFCONTROL, &frob);
  } else
#endif
    {
      // rise
      ctr = (ctr & ~bits) ^ value1;
      outb (ctr, Port+2);

      // pulse width
      ndelay(delay);      
      
      // lower
      ctr = (ctr & ~bits) ^ value2;
      outb (ctr, Port+2);
    }
}


void parport_data (unsigned char data)
{
#ifdef WITH_PPDEV
  if (PPdev) {
    ioctl(PPfd, PPWDATA, &data);
  } else
#endif
    {
      outb (data, Port);
    }
}

unsigned char parport_read (void)
{
  unsigned char data;
  
#ifdef WITH_PPDEV
  if (PPdev) {
    ioctl (PPfd, PPRDATA, &data);
  } else
#endif
    {
      data=inb (Port);
    }
  return data;
}


void parport_debug(void)
{
  unsigned char control;
  
#ifdef WITH_PPDEV
  if (PPdev) {
    ioctl (PPfd, PPRCONTROL, &control);
  } else 
#endif
    {
      control=ctr;
    }
  
  debug ("%cSTROBE %cAUTOFD %cINIT %cSELECT", 
	 control & PARPORT_CONTROL_STROBE ? '-':'+',
	 control & PARPORT_CONTROL_AUTOFD ? '-':'+',
	 control & PARPORT_CONTROL_INIT   ? '+':'-',
	 control & PARPORT_CONTROL_SELECT ? '-':'+');
  
}