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/* $Id: drv_generic_i2c.c,v 1.2 2005/04/05 05:12:57 reinelt Exp $
*
* generic driver helper for i2c displays
*
* Copyright (C) 2005 Luis F. Correia <luis.f.correia@seg-social.pt>
* Copyright (C) 2005 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.
*
*
* $Log: drv_generic_i2c.c,v $
* Revision 1.2 2005/04/05 05:12:57 reinelt
* i2c patch from Paul (still does not work here :-(
*
* Revision 1.1 2005/03/28 19:39:23 reinelt
* HD44780/I2C patch from Luis merged (still does not work for me)
*
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include <time.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <linux/compiler.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#include "debug.h"
#include "qprintf.h"
#include "cfg.h"
#include "udelay.h"
#include "drv_generic_i2c.h"
static char *Driver="";
static char *Section="";
static int i2c_device;
static void my_i2c_smbus_write_byte_data(const int device, const unsigned char data)
{
struct i2c_smbus_ioctl_data args;
args.read_write = I2C_SMBUS_WRITE;
args.command = data;
args.size = I2C_SMBUS_BYTE;
args.data = 0;
ioctl(device,I2C_SMBUS,&args);
}
static void my_i2c_smbus_read_byte_data(const int device, const unsigned char data)
{
struct i2c_smbus_ioctl_data args;
args.read_write = I2C_SMBUS_READ;
args.command = data;
args.size = I2C_SMBUS_BYTE;
args.data = 0;
ioctl(device,I2C_SMBUS,&args);
}
int drv_generic_i2c_open (const char *section, const char *driver)
{
int dev;
char *bus,*device;
//SIGNAL_ENABLE = 0x40;
//SIGNAL_RW = 0x10;
//SIGNAL_RS = 0x20;
udelay_init();
Section = (char*)section;
Driver = (char*)driver;
bus = cfg_get(Section, "Port", NULL);
device = cfg_get(Section, "Device", NULL);
dev = atoi(device);
info ("%s: initializing I2C bus %s",Driver,bus);
info ("device %d",dev);
if ((i2c_device = open(bus,O_WRONLY)) < 0) {
error("%s: I2C bus %s open failed !\n",Driver,bus);
return -1;
}
info ("%s: initializing I2C slave device 0x%x",Driver,dev);
if (ioctl(i2c_device,I2C_SLAVE, dev ) < 0) {
error("%s: error initializing device 0x%x\n",Driver,dev);
close(i2c_device);
return -1;
}
return 0;
}
int drv_generic_i2c_close (void)
{
close(i2c_device);
return 0;
}
unsigned char drv_generic_i2c_wire (const char *name, const char *deflt)
{
unsigned char w;
char wire[256];
char *s;
qprintf(wire, sizeof(wire), "Wire.%s", name);
s=cfg_get (Section, wire, deflt);
if(strlen(s)==3 && strncasecmp(s,"DB",2)==0 && s[2]>='0' && s[2]<='7') {
w=s[2]-'0';
} else if(strcasecmp(s,"GND")==0) {
w=0;
} else {
error ("%s: unknown signal <%s> for wire <%s>", Driver, s, name);
error ("%s: should be DB0..7 or GND", Driver);
return 0xff;
}
free(s);
if (w==0) {
info ("%s: wiring: [DISPLAY:%s]<==>[i2c:GND]", Driver, name);
} else {
info ("%s: wiring: [DISPLAY:%s]<==>[i2c:DB%d]", Driver, name, w);
}
w=1<<w;
return w;
}
void drv_generic_i2c_data (const unsigned char data)
{
my_i2c_smbus_write_byte_data(i2c_device, data);
}
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