#include<linux/init.h>

#include<linux/module.h>

#include<linux/kernel.h>

#include<linux/sched.h>

#include<linux/init.h>

#include<linux/timer.h>

#include<linux/kthread.h>

#include<linux/delay.h>

#include<linux/sched.h>

#include<linux/completion.h>

#include<linux/signal.h>

#include <asm/processor.h>

#include <asm/system.h>

#include <linux/param.h>

#include<linux/gpio.h>

#include "gpio-sama5d3-test.h"    //如果没有对应的.h文件，请注释

//static DECLARE_COMPLETION(my_completion);

static struct task_struct *task;

int flag = ;

int my_function(void *arg)

{

//     printk(" in %s()\n", __FUNCTION__);

    allow_signal(SIGKILL); //使得线程可以接收SIGKILL信号

    mdelay();

    printk("should stop: %d\n",kthread_should_stop());

    while (!signal_pending(current) && !kthread_should_stop())         //使得线程可以被杀死，也可以在rmmod的时候结束

    {

        printk(" jiffies is %lu\n", jiffies);

        set_current_state(TASK_INTERRUPTIBLE);

        schedule_timeout(HZ * );                   //这两句是为了延时5s，在这5s内，处理器会处理其他进程。

        printk("should stop: %d\n",kthread_should_stop());

    }

    printk("Leaving my_function\n");

    flag = ;

    return ;

}

static int __init sama5d3_gpio_init(void)

{

   printk("SAMA5D3 gpio init!\n") ;

     task = kthread_run(my_function,NULL,"my_function");

//     printk("<1> init wait_for_completion()\n");

    return ;

}

static void __exit sama5d3_gpio_exit(void)

{

    int ret ;

    printk("sama5d3 gpio exit!\n");

    if(!flag)

    {

        if(!IS_ERR(task))

        {

            ret = kthread_stop(task);

            printk(KERN_INFO "First thread function has stopped ,return %d\n", ret);

        }

    }//  printk("task_struct: 0x%x",task);

    printk(" Goodbye\n");

    return;

}

module_init(sama5d3_gpio_init);

module_exit(sama5d3_gpio_exit);

MODULE_AUTHOR("HUANGJJY");

MODULE_DESCRIPTION("GPIO driver for sama5d3");

MODULE_LICENSE("GPL");

ifeq ($(KERNELRELEASE),)

#KERNEL_DIR = /home/user/project2/ATMEL/linux-at91/      //如果是交叉编译，此为内核路径

KERNEL_DIR ?= /lib/modules/$(shell uname -r)/build

PWD :=$(shell pwd)

#CROSS_COMPILE = /home/user/project2/ATMEL/toolchain/gcc-linaro-arm-linux-gnueabihf-4.7-2013.04-20130415_linux/bin/arm-linux-gnueabihf-

#CC = $(CROSS_COMPILE)gcc   //如果是交叉编译，此为交叉编译工具链名称和路径
#INCLUDE = $(PWD)/gpio-sama5d3-test.h    //如果.c文件有.h文件，这是.h的路径

modules:

    $(MAKE) -C $(KERNEL_DIR) M=$(PWD) modules

    #$(MAKE) -I$(INCLUDE) -C $(KERNEL_DIR) M=$(PWD) modules  //如果该.c文件有.h文件，则用此编译语法

.PHONY:modules clean

clean:

    $(MAKE) -C $(KERNEL_DIR) M=$(PWD) clean

else

    obj-m := gpio-sama5d3-test.o

endif