驱动学习，hello world模块

 

driver.c源代码

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/sched.h>

 

MODULE_AUTHOR("sunsea");

MODULE_DESCRIPTION("module example");

MODULE_LICENSE("GPL");

 

static int time;

module_param(time, int, 0);

 

int __init

akae_init(void)

{

printk("hello world/n");

 

set_current_state(TASK_INTERRUPTIBLE); //延时

schedule_timeout(time*HZ); //延时时间，单位秒

 

printk("count = %d/n", count);

printk("time = %d/n", time);

return 0;

}

 

void __exit

akae_exit(void)

{

printk("module exit/n");

return;

}

 

module_init(akae_init);

module_exit(akae_exit);

 

Makefile文件

ifneq ($(KERNELRELEASE),)

#kbuild part of makefile

obj-m := driver.o

else

KERNELSRC :=/lib/modules/`uname -r`/build

 

modules:

make -C $(KERNELSRC) SUBDIRS=$(PWD) $@

 

clean:

rm -f *.o *.ko *.mod.c *~

endif

 

执行方法

sudo insmod driver.ko time=3 //加载模块

sudo rmmod driver //删除模块