/* $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);
  
}