lcd4linux.git - lcd4linux

Age	Commit message (Expand)	Author	Files	Lines
2007-01-14	removed all tags	michael	1	-28/+0
2007-01-14	svn properties fixed	michael	1	-1/+2
2005-05-08	[lcd4linux @ 2005-05-08 04:32:43 by reinelt]	reinelt	1	-2/+5
2005-01-18	[lcd4linux @ 2005-01-18 06:30:21 by reinelt]	reinelt	1	-2/+6
2004-03-03	[lcd4linux @ 2004-03-03 03:47:04 by reinelt]	reinelt	1	-2/+9
2003-12-19	[lcd4linux @ 2003-12-19 05:35:13 by reinelt]	reinelt	1	-6/+9
2003-10-11	[lcd4linux @ 2003-10-11 06:01:52 by reinelt]	reinelt	1	-6/+15
2003-10-06	[lcd4linux @ 2003-10-06 04:34:06 by reinelt]	reinelt	1	-11/+9
2003-10-05	[lcd4linux @ 2003-10-05 17:58:50 by reinelt]	reinelt	1	-4/+9
2003-08-08	[lcd4linux @ 2003-08-08 23:08:38 by reinelt]	reinelt	1	-2/+5
2003-06-22	[lcd4linux @ 2003-06-22 19:31:24 by reinelt]	reinelt	1	-11/+7
2000-03-24	[lcd4linux @ 2000-03-24 11:37:43 by reinelt]	reinelt	1	-10/+8
2000-03-06	[lcd4linux @ 2000-03-06 06:04:06 by reinelt]	reinelt	1	-0/+34
2000-01-16	[lcd4linux @ 2000-01-16 12:17:59 by reinelt]	reinelt	1	-0/+2

/* $Id: drv_generic_i2c.c,v 1.5 2005/06/01 12:50:25 reinelt Exp $ * * generic driver helper for i2c displays * * Copyright (C) 2005 Luis Correia <lfcorreia@users.sf.net> * 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 1.5 2005/06/01 12:50:25 reinelt * ifdef'ed unused function to avoid compiler warning * * Revision 1.4 2005/05/31 20:42:55 lfcorreia * new file: lcd4linux_i2c.h * avoid the problems detecting the proper I2C kernel include files * * rearrange all the other autoconf stuff to remove I2C detection * * new method by Paul Kamphuis to write to the I2C device * * Revision 1.3 2005/05/08 04:32:44 reinelt * CodingStyle added and applied * * 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) * * */ /* DISCLAIMER!!!! The following code is WORK IN PROGRESS, since it basicly 'works for us...' (C) 2005 Paul Kamphuis & Luis Correia We have removed all of the delays from this code, as the I2C bus is slow enough... (maximum possible speed is 100KHz only) */ #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 "lcd4linux_i2c.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 val) { struct i2c_smbus_ioctl_data args; union i2c_smbus_data data; args.read_write = I2C_SMBUS_WRITE; args.command = val; args.size = I2C_SMBUS_BYTE_DATA; data.byte = val; args.data = &data; if (ioctl(device, I2C_SMBUS, &args) < 0) { info("I2C: device %s IOCTL failed !\n", device); } } /* unused, ifdef'ed away to avoid compiler warning */ #if 0 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); } #endif int drv_generic_i2c_open(const char *section, const char *driver) { int dev; char *bus, *device; 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); } void drv_generic_i2c_command(const unsigned char command, const unsigned char *data, const unsigned char length) { i2c_smbus_write_block_data(i2c_device, command, length, (unsigned char *) data); }