/* ------------------------------------------------------------------------- */
/* pcf-lp.c i2c-hw access for PCF 8584 on bidir. parallel ports		     */
/* ------------------------------------------------------------------------- */
/* 
    Copyright (C) 1995-97 Simon G. Vogl

    This program 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 of the License, or
    (at your option) any later version.

    This program 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.		     */
/* ------------------------------------------------------------------------- */
static char rcsid[] = "$Id: pcf-elektor.c,v 1.1 1998/09/05 18:20:09 i2c Exp $";
/*
 * $Log: pcf-elektor.c,v $
 * Revision 1.1  1998/09/05 18:20:09  i2c
 * Initial revision
 *
 * Revision 1.1  1998/01/20 10:01:29  i2c
 * Initial revision
 *
 * Revision 1.2  1997/06/03 06:00:10  i2c
 * first version that works
 *
 * Revision 1.2  1996/11/20 20:20:46  i2c
 * first version for ISA bus.
 *
 * Revision 1.1  1996/11/17 11:00:03  i2c
 * Initial revision
 *
 *
 */

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <linux/errno.h>

#include "i2c.h"
#include "i2c-priv.h"

/* ----- global defines -----------------------------------------------	*/
#define DEB(x)		/* should be reasonable open, close &c. 	*/
#define DEB2(x) 	/* low level debugging - very slow 		*/
#define DEBE(x)	x	/* error messages 				*/

#define DEBHW(x) x 	/* lowest level hardware debug -- log changes of*/
			/* the bit lines...				*/
			
#define basePort(port)	(i2c_table[minor].base+(port))

/* ----- local functions ----------------------------------------------	*/

#if (PCFADAPS) > 1
#  define Local static
#else
#  define Local inline
#endif



Local	int  pcf_read (int minor, int adr)
{
	int ret;
	udelay(10);               /* Give the card some time */
	ret = inb(basePort( (adr!=0) ));/* force max. increment of 1 */
	return ret;
}


Local	void pcf_write (int minor, int adr,char data)
{
	udelay(10);               /* Give the card some time */
	outb(data,basePort( (adr!=0) ));
}


Local	int  pcf_init (int minor)
{
	if (check_region(i2c_table[minor].base, 4) < 0 ) {
		return -ENODEV;
	} else {
		request_region(i2c_table[minor].base,  4, "i2c (Elektor)");
	}
	return 0;
}


Local	void pcf_exit	(int minor)
{
	release_region( i2c_table[minor].base,  4 );
}


/* ------------------------------------------------------------------------
 * Encapsulate the above functions in the correct operations structure.
 * This is only done when more than one hardware adapter is supported.
 */
#if (PCFADAPS) > 1
struct i2c_pcf_ops pcf_lp_ops = {
	pcf_read,
	pcf_write,
	pcf_init,
	pcf_exit
};
#endif