源码下载
方式1.
http://download.csdn.net/detail/lugandong/9605246
方式2.
（1）
svn checkout http://lm-sensors.org/svn/i2c-tools/branches/i2c-tools-3.1 external/i2c-tools （2）
在 i2c-tools 目录下新建 Android.mk 文件，内容如下：
# external/i2c-tools/Android.mk
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := eng
LOCAL_C_INCLUDES += $(LOCAL_PATH) $(LOCAL_PATH)/$(KERNEL_DIR)/include
LOCAL_SRC_FILES := tools/i2cbusses.c tools/util.c
LOCAL_MODULE := i2c-tools
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := eng
LOCAL_SRC_FILES:=tools/i2cdetect.c
LOCAL_MODULE:=i2cdetect
LOCAL_CPPFLAGS += -DANDROID
LOCAL_SHARED_LIBRARIES:=libc
LOCAL_STATIC_LIBRARIES := i2c-tools
LOCAL_C_INCLUDES += $(LOCAL_PATH) $(LOCAL_PATH)/$(KERNEL_DIR)/include
include $(BUILD_EXECUTABLE)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := eng
LOCAL_SRC_FILES:=tools/i2cget.c
LOCAL_MODULE:=i2cget
LOCAL_CPPFLAGS += -DANDROID
LOCAL_SHARED_LIBRARIES:=libc
LOCAL_STATIC_LIBRARIES := i2c-tools
LOCAL_C_INCLUDES += $(LOCAL_PATH) $(LOCAL_PATH)/$(KERNEL_DIR)/include
include $(BUILD_EXECUTABLE)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := eng
LOCAL_SRC_FILES:=tools/i2cset.c
LOCAL_MODULE:=i2cset
LOCAL_CPPFLAGS += -DANDROID
LOCAL_SHARED_LIBRARIES:=libc
LOCAL_STATIC_LIBRARIES := i2c-tools
LOCAL_C_INCLUDES += $(LOCAL_PATH) $(LOCAL_PATH)/$(KERNEL_DIR)/include
include $(BUILD_EXECUTABLE)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := eng
LOCAL_SRC_FILES:=tools/i2cdump.c
LOCAL_MODULE:=i2cdump
LOCAL_CPPFLAGS += -DANDROID
LOCAL_SHARED_LIBRARIES:=libc
LOCAL_STATIC_LIBRARIES := i2c-tools
LOCAL_C_INCLUDES += $(LOCAL_PATH) $(LOCAL_PATH)/$(KERNEL_DIR)/include
include $(BUILD_EXECUTABLE)编译生成的4个文件复制到 Android 平台的 /system/bin 目录下
i2c-tools 的用法
i2cdetect
列举 I2C bus
# i2cdetect -l
i2c-0 i2c imx-i2c I2C adapter
i2c-1 i2c imx-i2c I2C adapter
i2c-2 i2c imx-i2c I2C adapter列举 I2C bus i2c-1 上面连接的所有设备
# i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- UU -- -- -- -- -- -- --
10: -- UU -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- 3a -- -- -- -- --
40: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
50: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --发现 I2C 设备的位置显示为UU或者表示设备地址的数值，UU表示该设备在 driver 中被使用。
i2cdump
dump I2C 设备大批量 register 的值
# i2cdump -y -f 1 0x3a
No size specified (using byte-data access)
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: eb 00 7f 05 3d 00 00 00 08 06 00 00 00 00 00 00 ?.??=...??......
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
20: 01 23 45 67 89 ab cd ef fe dc ba 98 76 54 32 10 ?#Eg????????vT2?
30: f0 e1 d2 c3 00 00 00 00 00 00 00 00 00 00 00 00 ????............
40: 80 00 10 00 00 00 00 00 00 00 00 00 00 00 00 00 ?.?.............
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
f0: 00 00 00 00 00 00 00 00 00 00 00 30 00 00 00 00 ...........0....i2cget
读取 I2C 设备某个 register 的值
# i2cget -y -f 1 0x3a 0x02
0x7fi2cset
# i2cset -y -f 1 0x3a 0x02 0x05转载：http://my.oschina.net/luoly/blog/368881
如果出现/dev/下没有i2c相关节点，此工具也是无效的。此时需要将i2c-dev.c编译进去。
在kernel/drivers/i2c，有i2c-dev.c，Makefile中具体体现：
obj-$(CONFIG_I2C_CHARDEV) += i2c-dev.o只要在arch/arm/configs中找到自己的configs在里面添加：
CONFIG_I2C_CHARDEV=y即可