HOWTO_build_your_own_module_如何build own module-优快云博客

本文链接：https://blog.youkuaiyun.com/sudolee/article/details/6654503

本文详细介绍如何在嵌入式Linux环境下为特定传感器编写驱动程序。包括如何在内核源码树中添加自定义配置项及模块参数设置，并提供具体步骤如修改Kconfig文件和Makefile来实现模块加载。

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<1>>>In kernel code tree:
aa>>>update Kconfig, eg: drivers/sensors/Kconfig中加入一行，引入自己的Kconfig：

source "drivers/sensors/Kconfig"

ab>>>your kconfig in subdir, drivers/sensors/Kconfig, example:

menuconfig SENSORS
        tristate "Sensors class support"
         default n
        ---help---
          Say Y here to enable sensors class support. This allows
          user manipulate the sensors from sysfs interface.

if SENSORS
 
config SENSORS_AKM8975
    tristate "AKM8975/C Compass-senseor Driver"
    default n
    ---help---
      Say Y here if you want to enable the AKM8975/C compass-sensor

endif # SENSORS

ba>>>update Makefile:

    >obj-m += sensors/
.or.
    >obj-$(CONFIG_SENSORS_AKM8975) += sensors/

bb>>>update Makefile in subdir:

        >obj-m := akm8975_sensors.o
       .or.
        >obj-$(CONFIG_SENSORS_AKM8975) := akm8975_sensors.o

p.s. module_param(name, type, perm);
1 The type argument holds the parameter's data type; it is one of byte, short, ushort, int, uint, long, ulong, charp, bool, or invbool.

2 the perm argument specifies the permissions of the corresponding file in sysfs.

<2>>>Outside kernel code tree, 只需要编写一个Makefile即可:

ifeq ($(KERNELRELEASE),)
modules:
           $(MAKE) -C /home/sudolee/workstation/kernel-2.6.32/ M=$(shell pwd) $@

else
          obj-m := debugfs.o
endif

clean:
          rm -f *.o *.cmd *.mod.* modules.order Module.symvers *.ko .*.cmd
          rm -rf .tmp_versions/
.PHONY:modules clean