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-rw-r--r--drv_generic_i2c.c362
1 files changed, 178 insertions, 184 deletions
diff --git a/drv_generic_i2c.c b/drv_generic_i2c.c
index 22b4c72..5f0851f 100644
--- a/drv_generic_i2c.c
+++ b/drv_generic_i2c.c
@@ -1,28 +1,31 @@
-/* $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.
- *
- *
+/* $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
@@ -30,163 +33,154 @@
* 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);
- }
-
-}
-
-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);
-
-}
+ *
+ * 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);
+}
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