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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
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