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/* $Id$
 * $URL$
 *
 * generic driver helper for parallel port displays
 *
 * Copyright (C) 1999, 2000 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 fuctions:
 *
 * int drv_generic_parport_open (void)
 *   reads 'Port' entry from config and opens
 *   the parallel port
 *   returns 0 if ok, -1 on failure
 *
 * int drv_generic_parport_close (void)
 *   closes parallel port
 *   returns 0 if ok, -1 on failure
 *
 * unsigned char drv_generic_parport_wire_ctrl (char *name, char *deflt)
 *   reads wiring for one control signal from config
 *   returns DRV_GENERIC_PARPORT_CONTROL_* or 255 on error
 *
 * unsigned char drv_generic_parport_hardwire_ctrl (char *name)
 *   returns hardwiring for one control signal
 *   same as above, but does not read from config,
 *   but checks the config and emits a warning that the config
 *   entry will be ignored
 *   returns DRV_GENERIC_PARPORT_CONTROL_* or 255 on error
 *
 * unsigned char drv_generic_parport_wire_status (char *name, char *deflt)
 *   reads wiring for one status signal from config
 *   returns DRV_GENERIC_PARPORT_STATUS_* or 255 on error
 *
 * unsigned char drv_generic_parport_wire_data (char *name, char *deflt)
 *   reads wiring for one data signal from config
 *   returns 1<<bitpos or 255 on error
 *
 * void drv_generic_parport_direction (int direction)
 *   0 - write to parport
 *   1 - read from parport
 *
 * unsigned char drv_generic_parport_status (void)
 *   reads control lines
 *
 * void drv_generic_parport_control (unsigned char mask, unsigned char value)
 *   frobs control line and takes care of inverted signals
 *
 * void drv_generic_parport_toggle (unsigned char bit, int level, int delay)
 *   toggles the line <bit> to <level> for <delay> nanoseconds
 *
 * void drv_generic_parport_data (unsigned char value)
 *   put data bits on DB1..DB8
 *
 * unsigned char drv_generic_parport_read (void)
 *   reads a byte from the parallel port
 *
 * void drv_generic_parport_debug(void)
 *   prints status of control lines
 *
 */

#ifndef _DRV_GENERIC_PARPORT_H_
#define _DRV_GENERIC_PARPORT_H_

int drv_generic_parport_open(const char *section, const char *driver);
int drv_generic_parport_close(void);
unsigned char drv_generic_parport_wire_ctrl(const char *name, const char *deflt);
unsigned char drv_generic_parport_hardwire_ctrl(const char *name, const char *deflt);
unsigned char drv_generic_parport_wire_status(const char *name, const char *deflt);
unsigned char drv_generic_parport_wire_data(const char *name, const char *deflt);
void drv_generic_parport_direction(const int direction);
unsigned char drv_generic_parport_status(void);
void drv_generic_parport_control(const unsigned char mask, const unsigned char value);
void drv_generic_parport_toggle(const unsigned char bit, const int level, const unsigned long delay);
void drv_generic_parport_data(const unsigned char data);
unsigned char drv_generic_parport_read(void);
void drv_generic_parport_debug(void);

#endif