New library for I2C device access under Linux. As a first step, the
library will host the i2c_smbus_*() inline functions which were
previously in the user-space flavor of <linux/i2c-dev.h>.
---
 Makefile            |   14 ++-
 README              |   32 +++++---
 include/i2c/smbus.h |  191 ++++-------------------------------------------
 lib/Module.mk       |  102 +++++++++++++++++++++++++
 lib/libi2c.map      |   18 ++++
 lib/smbus.c         |  203 +++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/Module.mk     |    9 +-
 7 files changed, 378 insertions(+), 191 deletions(-)

--- i2c-tools.orig/Makefile     2012-04-23 17:17:55.000000000 +0200
+++ i2c-tools/Makefile  2012-04-23 17:19:17.620841792 +0200
@@ -14,19 +14,25 @@ sbindir     = $(prefix)/sbin
 mandir = $(prefix)/share/man
 man8dir        = $(mandir)/man8
 incdir = $(prefix)/include
+libdir = $(prefix)/lib
 
 INSTALL                := install
 INSTALL_DATA   := $(INSTALL) -m 644
 INSTALL_DIR    := $(INSTALL) -m 755 -d
 INSTALL_PROGRAM        := $(INSTALL) -m 755
+LN             := ln -sf
 RM             := rm -f
 
 CC     ?= gcc
+AR     ?= ar
 
-CFLAGS ?= -O2
+CFLAGS         ?= -O2
 # When debugging, use the following instead
-#CFLAGS        := -O -g
-CFLAGS += -Wall
+#CFLAGS                := -O -g
+CFLAGS         += -Wall
+SOCFLAGS       := -fpic -D_REENTRANT $(CFLAGS)
+
+BUILD_STATIC_LIB ?= 1
 
 KERNELVERSION  := $(shell uname -r)
 
@@ -36,5 +42,5 @@ all:
 
 EXTRA  :=
 #EXTRA += py-smbus
-SRCDIRS        := include eeprom stub tools $(EXTRA)
+SRCDIRS        := include lib eeprom stub tools $(EXTRA)
 include $(SRCDIRS:%=%/Module.mk)
--- i2c-tools.orig/README       2010-11-16 09:33:15.000000000 +0100
+++ i2c-tools/README    2012-04-23 17:37:04.992752809 +0200
@@ -1,10 +1,15 @@
 I2C TOOLS FOR LINUX
 ===================
 
-This package contains an heterogeneous set of I2C tools for the Linux kernel.
-These tools were originally part of the lm-sensors project but were finally
-split into their own package for convenience. They compile, run and have been
-tested on GNU/Linux.
+This package contains an heterogeneous set of I2C tools for the Linux kernel
+as well as an I2C library. The tools were originally part of the lm-sensors
+project but were finally split into their own package for convenience. The
+library is used by some of the tools, but can also be used by third-party
+applications. The tools and library compile, run and have been tested on
+GNU/Linux.
+
+The latest version of the code can be downloaded from:
+  http://www.lm-sensors.org/wiki/I2CTools
 
 
 CONTENTS
@@ -25,6 +30,10 @@ category has its own sub-directory:
   C/C++ header files for I2C and SMBus access over i2c-dev. Installed by
   default.
 
+* lib
+  The I2C library, used by eepromer, py-smbus and tools. Installed by
+  default.
+
 * py-smbus
   Python wrapper for SMBus access over i2c-dev. Not installed by default.
 
@@ -40,16 +49,17 @@ category has its own sub-directory:
 INSTALLATION
 ------------
 
-There's no configure script, so simply run "make" to build the tools, and
-"make install" to install them. You also can use "make uninstall" to remove
-all the files you installed. By default, files are installed in /usr/local
-but you can change this behavior by editing the Makefile file and setting
-prefix to wherever you want. You may change the C compiler and the
-compilation flags as well.
+There's no configure script, so simply run "make" to build the library and
+tools, and "make install" to install them. You also can use "make uninstall"
+to remove all the files you installed. By default, files are installed in
+/usr/local but you can change the location by editing the Makefile file and
+setting prefix to wherever you want. You may change the C compiler and the
+compilation flags as well, and also decide whether to build the static
+library or not.
 
 Optionally, you can run "make strip" prior to "make install" if you want
 smaller binaries. However, be aware that this will prevent any further
-attempt to debug the programs.
+attempt to debug the library and tools.
 
 If you wish to include sub-directories that are not enabled by default, then
 just set them via the EXTRA make variable. For example, to build py-smbus,
--- i2c-tools.orig/include/i2c/smbus.h  2012-04-23 17:17:55.000000000 +0200
+++ i2c-tools/include/i2c/smbus.h       2012-04-23 17:19:17.621841792 +0200
@@ -23,190 +23,37 @@
 #ifndef LIB_I2C_SMBUS_H
 #define LIB_I2C_SMBUS_H
 
-#include <sys/ioctl.h>
 #include <linux/types.h>
 #include <linux/i2c.h>
-#include <linux/i2c-dev.h>
-
-/* Compatibility defines */
-#ifndef I2C_SMBUS_I2C_BLOCK_BROKEN
-#define I2C_SMBUS_I2C_BLOCK_BROKEN I2C_SMBUS_I2C_BLOCK_DATA
-#endif
-#ifndef I2C_FUNC_SMBUS_PEC
-#define I2C_FUNC_SMBUS_PEC I2C_FUNC_SMBUS_HWPEC_CALC
-#endif
-
-static inline __s32 i2c_smbus_access(int file, char read_write, __u8 command,
-                                    int size, union i2c_smbus_data *data)
-{
-       struct i2c_smbus_ioctl_data args;
-
-       args.read_write = read_write;
-       args.command = command;
-       args.size = size;
-       args.data = data;
-       return ioctl(file, I2C_SMBUS, &args);
-}
-
-
-static inline __s32 i2c_smbus_write_quick(int file, __u8 value)
-{
-       return i2c_smbus_access(file, value, 0, I2C_SMBUS_QUICK, NULL);
-}
-
-static inline __s32 i2c_smbus_read_byte(int file)
-{
-       union i2c_smbus_data data;
-       if (i2c_smbus_access(file, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &data))
-               return -1;
-       else
-               return 0x0FF & data.byte;
-}
-
-static inline __s32 i2c_smbus_write_byte(int file, __u8 value)
-{
-       return i2c_smbus_access(file, I2C_SMBUS_WRITE, value,
-                               I2C_SMBUS_BYTE, NULL);
-}
-
-static inline __s32 i2c_smbus_read_byte_data(int file, __u8 command)
-{
-       union i2c_smbus_data data;
-       if (i2c_smbus_access(file, I2C_SMBUS_READ, command,
-                            I2C_SMBUS_BYTE_DATA, &data))
-               return -1;
-       else
-               return 0x0FF & data.byte;
-}
-
-static inline __s32 i2c_smbus_write_byte_data(int file, __u8 command,
-                                             __u8 value)
-{
-       union i2c_smbus_data data;
-       data.byte = value;
-       return i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
-                               I2C_SMBUS_BYTE_DATA, &data);
-}
-
-static inline __s32 i2c_smbus_read_word_data(int file, __u8 command)
-{
-       union i2c_smbus_data data;
-       if (i2c_smbus_access(file, I2C_SMBUS_READ, command,
-                            I2C_SMBUS_WORD_DATA, &data))
-               return -1;
-       else
-               return 0x0FFFF & data.word;
-}
 
-static inline __s32 i2c_smbus_write_word_data(int file, __u8 command,
-                                             __u16 value)
-{
-       union i2c_smbus_data data;
-       data.word = value;
-       return i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
-                               I2C_SMBUS_WORD_DATA, &data);
-}
-
-static inline __s32 i2c_smbus_process_call(int file, __u8 command, __u16 value)
-{
-       union i2c_smbus_data data;
-       data.word = value;
-       if (i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
-                            I2C_SMBUS_PROC_CALL, &data))
-               return -1;
-       else
-               return 0x0FFFF & data.word;
-}
+extern __s32 i2c_smbus_access(int file, char read_write, __u8 command,
+                             int size, union i2c_smbus_data *data);
 
+extern __s32 i2c_smbus_write_quick(int file, __u8 value);
+extern __s32 i2c_smbus_read_byte(int file);
+extern __s32 i2c_smbus_write_byte(int file, __u8 value);
+extern __s32 i2c_smbus_read_byte_data(int file, __u8 command);
+extern __s32 i2c_smbus_write_byte_data(int file, __u8 command, __u8 value);
+extern __s32 i2c_smbus_read_word_data(int file, __u8 command);
+extern __s32 i2c_smbus_write_word_data(int file, __u8 command, __u16 value);
+extern __s32 i2c_smbus_process_call(int file, __u8 command, __u16 value);
 
 /* Returns the number of read bytes */
-static inline __s32 i2c_smbus_read_block_data(int file, __u8 command,
-                                             __u8 *values)
-{
-       union i2c_smbus_data data;
-       int i;
-       if (i2c_smbus_access(file, I2C_SMBUS_READ, command,
-                            I2C_SMBUS_BLOCK_DATA, &data))
-               return -1;
-       else {
-               for (i = 1; i <= data.block[0]; i++)
-                       values[i-1] = data.block[i];
-               return data.block[0];
-       }
-}
-
-static inline __s32 i2c_smbus_write_block_data(int file, __u8 command,
-                                              __u8 length, const __u8 *values)
-{
-       union i2c_smbus_data data;
-       int i;
-       if (length > 32)
-               length = 32;
-       for (i = 1; i <= length; i++)
-               data.block[i] = values[i-1];
-       data.block[0] = length;
-       return i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
-                               I2C_SMBUS_BLOCK_DATA, &data);
-}
+extern __s32 i2c_smbus_read_block_data(int file, __u8 command, __u8 *values);
+extern __s32 i2c_smbus_write_block_data(int file, __u8 command, __u8 length,
+                                       const __u8 *values);
 
 /* Returns the number of read bytes */
 /* Until kernel 2.6.22, the length is hardcoded to 32 bytes. If you
    ask for less than 32 bytes, your code will only work with kernels
    2.6.23 and later. */
-static inline __s32 i2c_smbus_read_i2c_block_data(int file, __u8 command,
-                                                 __u8 length, __u8 *values)
-{
-       union i2c_smbus_data data;
-       int i;
-
-       if (length > 32)
-               length = 32;
-       data.block[0] = length;
-       if (i2c_smbus_access(file, I2C_SMBUS_READ, command,
-                            length == 32 ? I2C_SMBUS_I2C_BLOCK_BROKEN :
-                             I2C_SMBUS_I2C_BLOCK_DATA, &data))
-               return -1;
-       else {
-               for (i = 1; i <= data.block[0]; i++)
-                       values[i-1] = data.block[i];
-               return data.block[0];
-       }
-}
-
-static inline __s32 i2c_smbus_write_i2c_block_data(int file, __u8 command,
-                                                  __u8 length,
-                                                  const __u8 *values)
-{
-       union i2c_smbus_data data;
-       int i;
-       if (length > 32)
-               length = 32;
-       for (i = 1; i <= length; i++)
-               data.block[i] = values[i-1];
-       data.block[0] = length;
-       return i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
-                               I2C_SMBUS_I2C_BLOCK_BROKEN, &data);
-}
+extern __s32 i2c_smbus_read_i2c_block_data(int file, __u8 command, __u8 length,
+                                          __u8 *values);
+extern __s32 i2c_smbus_write_i2c_block_data(int file, __u8 command, __u8 
length,
+                                           const __u8 *values);
 
 /* Returns the number of read bytes */
-static inline __s32 i2c_smbus_block_process_call(int file, __u8 command,
-                                                __u8 length, __u8 *values)
-{
-       union i2c_smbus_data data;
-       int i;
-       if (length > 32)
-               length = 32;
-       for (i = 1; i <= length; i++)
-               data.block[i] = values[i-1];
-       data.block[0] = length;
-       if (i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
-                            I2C_SMBUS_BLOCK_PROC_CALL, &data))
-               return -1;
-       else {
-               for (i = 1; i <= data.block[0]; i++)
-                       values[i-1] = data.block[i];
-               return data.block[0];
-       }
-}
+extern __s32 i2c_smbus_block_process_call(int file, __u8 command, __u8 length,
+                                         __u8 *values);
 
 #endif /* LIB_I2C_SMBUS_H */
--- /dev/null   1970-01-01 00:00:00.000000000 +0000
+++ i2c-tools/lib/Module.mk     2012-04-23 17:22:20.026327035 +0200
@@ -0,0 +1,102 @@
+# I2C library for Linux
+#
+# Copyright (C) 2012  Jean Delvare <[email protected]>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published
+# by the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+
+LIB_DIR                := lib
+
+LIB_CFLAGS     := -Wstrict-prototypes -Wshadow -Wpointer-arith -Wcast-qual \
+                  -Wcast-align -Wwrite-strings -Wnested-externs -Winline \
+                  -W -Wundef -Wmissing-prototypes -Iinclude
+
+# The main and minor version of the library
+# The library soname (major number) must be changed if and only if the
+# interface is changed in a backward incompatible way.  The interface is
+# defined by the public header files - in this case they are only smbus.h.
+LIB_MAINVER    := 0
+LIB_MINORVER   := 1.0
+LIB_VER                := $(LIB_MAINVER).$(LIB_MINORVER)
+
+# The shared and static library names
+LIB_SHBASENAME := libi2c.so
+LIB_SHSONAME   := $(LIB_SHBASENAME).$(LIB_MAINVER)
+LIB_SHLIBNAME  := $(LIB_SHBASENAME).$(LIB_VER)
+LIB_STLIBNAME  := libi2c.a
+
+LIB_TARGETS    := $(LIB_SHLIBNAME)
+LIB_LINKS      := $(LIB_SHSONAME) $(LIB_SHBASENAME)
+LIB_OBJECTS    := smbus.o
+ifeq ($(BUILD_STATIC_LIB),1)
+LIB_TARGETS    += $(LIB_STLIBNAME)
+LIB_OBJECTS    += smbus.ao
+endif
+
+#
+# Libraries
+#
+
+$(LIB_DIR)/$(LIB_SHLIBNAME): $(LIB_DIR)/smbus.o
+       $(CC) -shared $(LDFLAGS) -Wl,--version-script=$(LIB_DIR)/libi2c.map 
-Wl,-soname,$(LIB_SHSONAME) -o $@ $^ -lc
+
+$(LIB_DIR)/$(LIB_SHSONAME):
+       $(RM) $@
+       $(LN) $(LIB_SHLIBNAME) $@
+
+$(LIB_DIR)/$(LIB_SHBASENAME):
+       $(RM) $@
+       $(LN) $(LIB_SHLIBNAME) $@
+
+$(LIB_DIR)/$(LIB_STLIBNAME): $(LIB_DIR)/smbus.ao
+       $(RM) $@
+       $(AR) rcvs $@ $^
+
+#
+# Objects
+# Each object must be built twice, once for the shared library and
+# once again for the static library.
+#
+
+$(LIB_DIR)/smbus.o: $(LIB_DIR)/smbus.c $(INCLUDE_DIR)/i2c/smbus.h
+       $(CC) $(SOCFLAGS) $(LIB_CFLAGS) -c $< -o $@
+
+$(LIB_DIR)/smbus.ao: $(LIB_DIR)/smbus.c $(INCLUDE_DIR)/i2c/smbus.h
+       $(CC) $(CFLAGS) $(LIB_CFLAGS) -c $< -o $@
+
+#
+# Commands
+#
+
+all-lib: $(addprefix $(LIB_DIR)/,$(LIB_TARGETS) $(LIB_LINKS))
+
+strip-lib: $(addprefix $(LIB_DIR)/,$(LIB_TARGETS))
+       strip $(addprefix $(LIB_DIR)/,$(LIB_TARGETS))
+
+clean-lib:
+       $(RM) $(addprefix $(LIB_DIR)/,*.o *.ao $(LIB_TARGETS) $(LIB_LINKS))
+
+install-lib: $(addprefix $(LIB_DIR)/,$(LIB_TARGETS))
+       $(INSTALL_DIR) $(DESTDIR)$(libdir)
+       $(INSTALL_PROGRAM) $(LIB_DIR)/$(LIB_SHLIBNAME) $(DESTDIR)$(libdir)
+       $(LN) $(LIB_SHLIBNAME) $(DESTDIR)$(libdir)/$(LIB_SHSONAME)
+       $(LN) $(LIB_SHSONAME) $(DESTDIR)$(libdir)/$(LIB_SHBASENAME)
+ifeq ($(BUILD_STATIC_LIB),1)
+       $(INSTALL_PROGRAM) $(LIB_DIR)/$(LIB_STLIBNAME) $(DESTDIR)$(libdir)
+endif
+
+uninstall-lib:
+       for library in $(LIB_TARGETS) $(LIB_LINKS) ; do \
+       $(RM) $(DESTDIR)$(libdir)/$$library ; done
+
+all: all-lib
+
+strip: strip-lib
+
+clean: clean-lib
+
+install: install-lib
+
+uninstall: uninstall-lib
--- /dev/null   1970-01-01 00:00:00.000000000 +0000
+++ i2c-tools/lib/libi2c.map    2012-04-23 17:19:17.621841792 +0200
@@ -0,0 +1,18 @@
+{
+global:
+  i2c_smbus_access;
+  i2c_smbus_write_quick;
+  i2c_smbus_read_byte;
+  i2c_smbus_write_byte;
+  i2c_smbus_read_byte_data;
+  i2c_smbus_write_byte_data;
+  i2c_smbus_read_word_data;
+  i2c_smbus_write_word_data;
+  i2c_smbus_process_call;
+  i2c_smbus_read_block_data;
+  i2c_smbus_write_block_data;
+  i2c_smbus_read_i2c_block_data;
+  i2c_smbus_write_i2c_block_data;
+  i2c_smbus_block_process_call;
+local: *;
+ };
--- /dev/null   1970-01-01 00:00:00.000000000 +0000
+++ i2c-tools/lib/smbus.c       2012-04-23 17:19:17.621841792 +0200
@@ -0,0 +1,203 @@
+/*
+    smbus.c - SMBus level access helper functions
+
+    Copyright (C) 1995-97 Simon G. Vogl
+    Copyright (C) 1998-99 Frodo Looijaard <[email protected]>
+
+    This program 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 of the License, or
+    (at your option) any later version.
+
+    This program 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., 51 Franklin Street, Fifth Floor, Boston,
+    MA 02110-1301 USA.
+*/
+
+#include <i2c/smbus.h>
+#include <sys/ioctl.h>
+#include <linux/types.h>
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+
+/* Compatibility defines */
+#ifndef I2C_SMBUS_I2C_BLOCK_BROKEN
+#define I2C_SMBUS_I2C_BLOCK_BROKEN I2C_SMBUS_I2C_BLOCK_DATA
+#endif
+#ifndef I2C_FUNC_SMBUS_PEC
+#define I2C_FUNC_SMBUS_PEC I2C_FUNC_SMBUS_HWPEC_CALC
+#endif
+
+__s32 i2c_smbus_access(int file, char read_write, __u8 command,
+                      int size, union i2c_smbus_data *data)
+{
+       struct i2c_smbus_ioctl_data args;
+
+       args.read_write = read_write;
+       args.command = command;
+       args.size = size;
+       args.data = data;
+       return ioctl(file, I2C_SMBUS, &args);
+}
+
+
+__s32 i2c_smbus_write_quick(int file, __u8 value)
+{
+       return i2c_smbus_access(file, value, 0, I2C_SMBUS_QUICK, NULL);
+}
+
+__s32 i2c_smbus_read_byte(int file)
+{
+       union i2c_smbus_data data;
+       if (i2c_smbus_access(file, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &data))
+               return -1;
+       else
+               return 0x0FF & data.byte;
+}
+
+__s32 i2c_smbus_write_byte(int file, __u8 value)
+{
+       return i2c_smbus_access(file, I2C_SMBUS_WRITE, value,
+                               I2C_SMBUS_BYTE, NULL);
+}
+
+__s32 i2c_smbus_read_byte_data(int file, __u8 command)
+{
+       union i2c_smbus_data data;
+       if (i2c_smbus_access(file, I2C_SMBUS_READ, command,
+                            I2C_SMBUS_BYTE_DATA, &data))
+               return -1;
+       else
+               return 0x0FF & data.byte;
+}
+
+__s32 i2c_smbus_write_byte_data(int file, __u8 command, __u8 value)
+{
+       union i2c_smbus_data data;
+       data.byte = value;
+       return i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
+                               I2C_SMBUS_BYTE_DATA, &data);
+}
+
+__s32 i2c_smbus_read_word_data(int file, __u8 command)
+{
+       union i2c_smbus_data data;
+       if (i2c_smbus_access(file, I2C_SMBUS_READ, command,
+                            I2C_SMBUS_WORD_DATA, &data))
+               return -1;
+       else
+               return 0x0FFFF & data.word;
+}
+
+__s32 i2c_smbus_write_word_data(int file, __u8 command, __u16 value)
+{
+       union i2c_smbus_data data;
+       data.word = value;
+       return i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
+                               I2C_SMBUS_WORD_DATA, &data);
+}
+
+__s32 i2c_smbus_process_call(int file, __u8 command, __u16 value)
+{
+       union i2c_smbus_data data;
+       data.word = value;
+       if (i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
+                            I2C_SMBUS_PROC_CALL, &data))
+               return -1;
+       else
+               return 0x0FFFF & data.word;
+}
+
+/* Returns the number of read bytes */
+__s32 i2c_smbus_read_block_data(int file, __u8 command, __u8 *values)
+{
+       union i2c_smbus_data data;
+       int i;
+       if (i2c_smbus_access(file, I2C_SMBUS_READ, command,
+                            I2C_SMBUS_BLOCK_DATA, &data))
+               return -1;
+       else {
+               for (i = 1; i <= data.block[0]; i++)
+                       values[i-1] = data.block[i];
+               return data.block[0];
+       }
+}
+
+__s32 i2c_smbus_write_block_data(int file, __u8 command, __u8 length,
+                                const __u8 *values)
+{
+       union i2c_smbus_data data;
+       int i;
+       if (length > 32)
+               length = 32;
+       for (i = 1; i <= length; i++)
+               data.block[i] = values[i-1];
+       data.block[0] = length;
+       return i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
+                               I2C_SMBUS_BLOCK_DATA, &data);
+}
+
+/* Returns the number of read bytes */
+/* Until kernel 2.6.22, the length is hardcoded to 32 bytes. If you
+   ask for less than 32 bytes, your code will only work with kernels
+   2.6.23 and later. */
+__s32 i2c_smbus_read_i2c_block_data(int file, __u8 command, __u8 length,
+                                   __u8 *values)
+{
+       union i2c_smbus_data data;
+       int i;
+
+       if (length > 32)
+               length = 32;
+       data.block[0] = length;
+       if (i2c_smbus_access(file, I2C_SMBUS_READ, command,
+                            length == 32 ? I2C_SMBUS_I2C_BLOCK_BROKEN :
+                             I2C_SMBUS_I2C_BLOCK_DATA, &data))
+               return -1;
+       else {
+               for (i = 1; i <= data.block[0]; i++)
+                       values[i-1] = data.block[i];
+               return data.block[0];
+       }
+}
+
+__s32 i2c_smbus_write_i2c_block_data(int file, __u8 command, __u8 length,
+                                    const __u8 *values)
+{
+       union i2c_smbus_data data;
+       int i;
+       if (length > 32)
+               length = 32;
+       for (i = 1; i <= length; i++)
+               data.block[i] = values[i-1];
+       data.block[0] = length;
+       return i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
+                               I2C_SMBUS_I2C_BLOCK_BROKEN, &data);
+}
+
+/* Returns the number of read bytes */
+__s32 i2c_smbus_block_process_call(int file, __u8 command, __u8 length,
+                                  __u8 *values)
+{
+       union i2c_smbus_data data;
+       int i;
+       if (length > 32)
+               length = 32;
+       for (i = 1; i <= length; i++)
+               data.block[i] = values[i-1];
+       data.block[0] = length;
+       if (i2c_smbus_access(file, I2C_SMBUS_WRITE, command,
+                            I2C_SMBUS_BLOCK_PROC_CALL, &data))
+               return -1;
+       else {
+               for (i = 1; i <= data.block[0]; i++)
+                       values[i-1] = data.block[i];
+               return data.block[0];
+       }
+}
--- i2c-tools.orig/tools/Module.mk      2012-04-23 17:17:55.000000000 +0200
+++ i2c-tools/tools/Module.mk   2012-04-23 17:26:39.778141451 +0200
@@ -12,6 +12,7 @@ TOOLS_DIR     := tools
 TOOLS_CFLAGS   := -Wstrict-prototypes -Wshadow -Wpointer-arith -Wcast-qual \
                   -Wcast-align -Wwrite-strings -Wnested-externs -Winline \
                   -W -Wundef -Wmissing-prototypes -Iinclude
+TOOLS_LDFLAGS  := -Llib -li2c
 
 TOOLS_TARGETS  := i2cdetect i2cdump i2cset i2cget
 
@@ -20,16 +21,16 @@ TOOLS_TARGETS       := i2cdetect i2cdump i2cse
 #
 
 $(TOOLS_DIR)/i2cdetect: $(TOOLS_DIR)/i2cdetect.o $(TOOLS_DIR)/i2cbusses.o
-       $(CC) $(LDFLAGS) -o $@ $^
+       $(CC) $(LDFLAGS) $(TOOLS_LDFLAGS) -o $@ $^
 
 $(TOOLS_DIR)/i2cdump: $(TOOLS_DIR)/i2cdump.o $(TOOLS_DIR)/i2cbusses.o 
$(TOOLS_DIR)/util.o
-       $(CC) $(LDFLAGS) -o $@ $^
+       $(CC) $(LDFLAGS) $(TOOLS_LDFLAGS) -o $@ $^
 
 $(TOOLS_DIR)/i2cset: $(TOOLS_DIR)/i2cset.o $(TOOLS_DIR)/i2cbusses.o 
$(TOOLS_DIR)/util.o
-       $(CC) $(LDFLAGS) -o $@ $^
+       $(CC) $(LDFLAGS) $(TOOLS_LDFLAGS) -o $@ $^
 
 $(TOOLS_DIR)/i2cget: $(TOOLS_DIR)/i2cget.o $(TOOLS_DIR)/i2cbusses.o 
$(TOOLS_DIR)/util.o
-       $(CC) $(LDFLAGS) -o $@ $^
+       $(CC) $(LDFLAGS) $(TOOLS_LDFLAGS) -o $@ $^
 
 #
 # Objects

-- 
Jean Delvare
--
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