1 files changed, 155 insertions, 0 deletions
diff --git a/drv_generic_i2c.c b/drv_generic_i2c.c
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+/* $Id: drv_generic_i2c.c,v 1.1 2005/03/28 19:39:23 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 1.1  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();
+
+  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);
+  
+}