/**************************************************************************

 *                   I.MX6 Android i2c-tools porting

 * 说明：

 *     判断I2C总线设备是否存在，每次都去查dmesg，实在是烦了，于是还是移植

 * 一个i2c-tools比较好，不用翻那长长内核信息。

 *

 *                                        2016-3-31 深圳 南山平山村 曾剑锋

 *************************************************************************/

一、参考资料：

    . Android 平台下使用 i2c-tools

        http://my.oschina.net/luoly/blog/368881

    . 树莓派学习笔记——I2C Tools 学习笔记

        http://blog.csdn.net/xukai871105/article/details/15029843

    . Linux I2C工具查看配置I2C设备

        http://blog.chinaunix.net/uid-26895763-id-3478882.html

二、download:

    groeck/i2c-tools:

        https://github.com/groeck/i2c-tools

三、Decompress：

    zengjf@zengjf:~$ unzip i2c-tools-master.zip

    zengjf@zengjf:~$ mv i2c-tools-master ~/myandroid/external/i2c-tools/

四、cat external/i2c-tools/Android.mk

    # 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/util.c tools/i2cbusses.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)

五、compile error:

    . 现象：

        ......

        PRODUCT_COPY_FILES frameworks/base/data/sounds/ringtones/ogg/Solarium.ogg:system/media/audio/ringtones/Solarium.ogg ignored.

        No private recovery resources for TARGET_DEVICE sabresd_6dq

        make: Entering directory `/home/zengjf/myandroid'

        target thumb C: i2c-tools <= /home/zengjf/myandroid/external/i2c-tools//lib/smbus.c

        target StaticLib: i2c-tools (out/target/product/sabresd_6dq/obj/STATIC_LIBRARIES/i2c-tools_intermediates/i2c-tools.a)

        target thumb C: i2cdetect <= /home/zengjf/myandroid/external/i2c-tools/lib/smbus.c

        target thumb C: i2cdetect <= /home/zengjf/myandroid/external/i2c-tools/tools/i2cdetect.c

        /home/zengjf/myandroid/external/i2c-tools/tools/i2cdetect.c::: error: 'I2C_FUNC_SMBUS_PEC' undeclared here (not in a function)

        make: *** [out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cdetect_intermediates/tools/i2cdetect.o] Error

        make: Leaving directory `/home/zengjf/myandroid'

    . 解决办法：

        cat external/i2c-tools/include/i2c/smbus.h

            .....

            /* Compatibility defines  添加宏声明*/

            #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

            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);

            ......

    . 正常现象：

        No private recovery resources for TARGET_DEVICE sabresd_6dq

        make: Entering directory `/home/zengjf/myandroid'

        target thumb C: i2cdetect <= /home/zengjf/myandroid/external/i2c-tools/tools/i2cdetect.c

        target Executable: i2cdetect (out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cdetect_intermediates/LINKED/i2cdetect)

        target Symbolic: i2cdetect (out/target/product/sabresd_6dq/symbols/system/bin/i2cdetect)

        Export includes file: /home/zengjf/myandroid/external/i2c-tools/Android.mk -- out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cdetect_intermediates/export_includes

        target Strip: i2cdetect (out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cdetect_intermediates/i2cdetect)

        Install: out/target/product/sabresd_6dq/system/bin/i2cdetect

        Import includes file: out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cget_intermediates/import_includes

        target thumb C: i2cget <= /home/zengjf/myandroid/external/i2c-tools/tools/i2cget.c

        target Executable: i2cget (out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cget_intermediates/LINKED/i2cget)

        target Symbolic: i2cget (out/target/product/sabresd_6dq/symbols/system/bin/i2cget)

        Export includes file: /home/zengjf/myandroid/external/i2c-tools/Android.mk -- out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cget_intermediates/export_includes

        target Strip: i2cget (out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cget_intermediates/i2cget)

        Install: out/target/product/sabresd_6dq/system/bin/i2cget

        Import includes file: out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cset_intermediates/import_includes

        target thumb C: i2cset <= /home/zengjf/myandroid/external/i2c-tools/tools/i2cset.c

        target Executable: i2cset (out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cset_intermediates/LINKED/i2cset)

        target Symbolic: i2cset (out/target/product/sabresd_6dq/symbols/system/bin/i2cset)

        Export includes file: /home/zengjf/myandroid/external/i2c-tools/Android.mk -- out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cset_intermediates/export_includes

        target Strip: i2cset (out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cset_intermediates/i2cset)

        Install: out/target/product/sabresd_6dq/system/bin/i2cset

        Import includes file: out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cdump_intermediates/import_includes

        target thumb C: i2cdump <= /home/zengjf/myandroid/external/i2c-tools/tools/i2cdump.c

        target Executable: i2cdump (out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cdump_intermediates/LINKED/i2cdump)

        target Symbolic: i2cdump (out/target/product/sabresd_6dq/symbols/system/bin/i2cdump)

        Export includes file: /home/zengjf/myandroid/external/i2c-tools/Android.mk -- out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cdump_intermediates/export_includes

        target Strip: i2cdump (out/target/product/sabresd_6dq/obj/EXECUTABLES/i2cdump_intermediates/i2cdump)

        Install: out/target/product/sabresd_6dq/system/bin/i2cdump

        make: Leaving directory `/home/zengjf/myandroid'

        zengjf@zengjf:~/myandroid$

    . adb push <编译出来的可执行程序> /data/local

六、i2cdetect test:

    . test1:

        |root@android:/data/local # ./i2cdetect -l

        i2c-   i2c             i2c-gpio3        I2C adapter

        i2c-   i2c             imx-i2c          I2C adapter

        i2c-   i2c             imx-i2c          I2C adapter

        i2c-   i2c             imx-i2c          I2C adapter

        root@android:/data/local #

    . test2:

        root@android:/data/local # ./i2cdetect -y -r

                   a  b  c  d  e  f

        :          -- -- -- -- -- -- -- -- -- -- -- -- --

        : -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

        : -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

        : -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

        : -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

        : UU -- -- -- -- UU -- -- -- -- -- -- -- -- -- --

        : -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --

        : -- -- -- -- -- -- -- --

七、i2cget test:

    |root@android:/data/local # ./i2cget -y  0x08 0x03

    Error: Could not set address to 0x08: Device or resource busy

    |root@android:/data/local # ./i2cget -f -y  0x08 0x03

    0x21

    |root@android:/data/local #