/* ------------------------------------------------------------------------- *//* i2c-velleman.c i2c-hw access for Velleman K9000 adapters		     *//* ------------------------------------------------------------------------- *//*   Copyright (C) 1995-96, 2000 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.		     *//* ------------------------------------------------------------------------- *//* $Id: i2c-velleman.c,v 1.2 2004/02/06 13:19:45 laputa Exp $ */#include <linux/kernel.h>#include <linux/ioport.h>#include <linux/module.h>#include <linux/init.h>#include <linux/string.h>  /* for 2.0 kernels to get NULL   */#include <asm/errno.h>     /* for 2.0 kernels to get ENODEV */#include <asm/io.h>#include <linux/i2c.h>#include <linux/i2c-algo-bit.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 				*/					/* Pin Port  Inverted	name	*/#define I2C_SDA		0x02		/*  ctrl bit 1 	(inv)	*/#define I2C_SCL		0x08		/*  ctrl bit 3 	(inv)	*/#define I2C_SDAIN	0x10		/* stat bit 4		*/#define I2C_SCLIN	0x08		/* ctrl bit 3 (inv)(reads own output)*/#define I2C_DMASK	0xfd#define I2C_CMASK	0xf7/* --- Convenience defines for the parallel port:			*/#define BASE	(unsigned int)(data)#define DATA	BASE			/* Centronics data port		*/#define STAT	(BASE+1)		/* Centronics status port	*/#define CTRL	(BASE+2)		/* Centronics control port	*/#define DEFAULT_BASE 0x378static int base=0;/* ----- local functions --------------------------------------------------- */static void bit_velle_setscl(void *data, int state){	if (state) {		outb(inb(CTRL) & I2C_CMASK,   CTRL);	} else {		outb(inb(CTRL) | I2C_SCL, CTRL);	}	}static void bit_velle_setsda(void *data, int state){	if (state) {		outb(inb(CTRL) & I2C_DMASK , CTRL);	} else {		outb(inb(CTRL) | I2C_SDA, CTRL);	}	} static int bit_velle_getscl(void *data){	return ( 0 == ( (inb(CTRL)) & I2C_SCLIN ) );}static int bit_velle_getsda(void *data){	return ( 0 != ( (inb(STAT)) & I2C_SDAIN ) );}static int bit_velle_init(void){	if (check_region(base,(base == 0x3bc)? 3 : 8) < 0 ) {		DEBE(printk("i2c-velleman.o: Port %#x already in use.\n",		     base));		return -ENODEV;	} else {		request_region(base, (base == 0x3bc)? 3 : 8, 			"i2c (Vellemann adapter)");		bit_velle_setsda((void*)base,1);		bit_velle_setscl((void*)base,1);	}	return 0;}static void __exit bit_velle_exit(void){		release_region( base , (base == 0x3bc)? 3 : 8 );}static int bit_velle_reg(struct i2c_client *client){	return 0;}static int bit_velle_unreg(struct i2c_client *client){	return 0;}static void bit_velle_inc_use(struct i2c_adapter *adap){	MOD_INC_USE_COUNT;}static void bit_velle_dec_use(struct i2c_adapter *adap){	MOD_DEC_USE_COUNT;}/* ------------------------------------------------------------------------ * Encapsulate the above functions in the correct operations structure. * This is only done when more than one hardware adapter is supported. */static struct i2c_algo_bit_data bit_velle_data = {	NULL,	bit_velle_setsda,	bit_velle_setscl,	bit_velle_getsda,	bit_velle_getscl,	10, 10, 100,		/*	waits, timeout */};static struct i2c_adapter bit_velle_ops = {	"Velleman K8000",	I2C_HW_B_VELLE,	NULL,	&bit_velle_data,	bit_velle_inc_use,	bit_velle_dec_use,	bit_velle_reg,	bit_velle_unreg,};static int __init i2c_bitvelle_init(void){	printk("i2c-velleman.o: i2c Velleman K8000 adapter module\n");	if (base==0) {		/* probe some values */		base=DEFAULT_BASE;		bit_velle_data.data=(void*)DEFAULT_BASE;		if (bit_velle_init()==0) {			if(i2c_bit_add_bus(&bit_velle_ops) < 0)				return -ENODEV;		} else {			return -ENODEV;		}	} else {		bit_velle_data.data=(void*)base;		if (bit_velle_init()==0) {			if(i2c_bit_add_bus(&bit_velle_ops) < 0)				return -ENODEV;		} else {			return -ENODEV;		}	}	printk("i2c-velleman.o: found device at %#x.\n",base);	return 0;}static void __exit i2c_bitvelle_exit(void){	i2c_bit_del_bus(&bit_velle_ops);	bit_velle_exit();}EXPORT_NO_SYMBOLS;MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>");MODULE_DESCRIPTION("I2C-Bus adapter routines for Velleman K8000 adapter");MODULE_LICENSE("GPL");MODULE_PARM(base, "i");module_init(i2c_bitvelle_init);module_exit(i2c_bitvelle_exit);