diff options
Diffstat (limited to 'drv_generic_i2c.c')
-rw-r--r-- | drv_generic_i2c.c | 350 |
1 files changed, 189 insertions, 161 deletions
diff --git a/drv_generic_i2c.c b/drv_generic_i2c.c index 538b19a..22b4c72 100644 --- a/drv_generic_i2c.c +++ b/drv_generic_i2c.c @@ -1,164 +1,192 @@ -/* $Id: drv_generic_i2c.c,v 1.3 2005/05/08 04:32:44 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. - * - * +/* $Id: drv_generic_i2c.c,v 1.4 2005/05/31 20:42:55 lfcorreia 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 1.3 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) + * 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 * - */ - -#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); - -} + * 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);
+ }
+
+}
+
+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;
+
+ 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);
+
+}
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