讯为Exynos4412开发板例程及注释——LED

#include 
#include 

/*驱动注册的头文件，包含驱动的结构体和注册和卸载的函数*/
#include 
/*注册杂项设备头文件*/
#include 
/*注册设备节点的文件结构体*/
#include 

/*Linux中申请GPIO的头文件*/
#include 
/*三星平台的GPIO配置函数头文件*/
/*三星平台EXYNOS系列平台，GPIO配置参数宏定义头文件*/
#include 
#include 
/*三星平台4412平台，GPIO宏定义头文件*/
#include 
//vim arch/arm/mach-exynos/include/mach/gpio-exynos4.h
#define DRIVER_NAME "hello_ctl"
#define DEVICE_NAME "hello_ctl"


MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("TOPEET");

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

以下为设置设备节点

*************************************************************************/
static long hello_ioctl( struct file *files, unsigned int cmd, unsigned long arg){
	printk("cmd is %d,arg is %d\n",cmd,arg);
	
	if(cmd > 1){
		printk(KERN_EMERG "cmd is 0 or 1\n");
	}
	if(arg > 1){
		printk(KERN_EMERG "arg is only 1\n");
	}
	
	gpio_set_value(EXYNOS4_GPL2(0),cmd);
	
	return 0;
}

static int hello_release(struct inode *inode, struct file *file){
	printk(KERN_EMERG "hello release\n");
	return 0;
}

static int hello_open(struct inode *inode, struct file *file){
	printk(KERN_EMERG "hello open\n");
	return 0;
}

static struct file_operations hello_ops = {
	.owner = THIS_MODULE,
	.open = hello_open,
	.release = hello_release,
	.unlocked_ioctl = hello_ioctl,
};



static  struct miscdevice hello_dev = {
	.minor = MISC_DYNAMIC_MINOR,//自动分配
	.name = DEVICE_NAME,
	.fops = &hello_ops,
};
/*  misedevice 结构：
struct miscdevice  {
    int minor; //次设备号，若为 MISC_DYNAMIC_MINOR 自动分配
    const char *name; //设备名
    struct file_operations *fops; //设备操作
    struct list_head list;
    struct device *dev;
    struct class_device *class;
    char devfs_name[64];
};
*/

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

以下为——驱动注册

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

//GPIO初始化在Probe中进行
static int hello_probe(struct platform_device *pdv){
	int ret;
	
	printk(KERN_EMERG "\tinitialized\n");
	
	ret = gpio_request(EXYNOS4_GPL2(0),"LEDS");
	//其原型为 int gpio_request(unsigned gpio, const char *label) 
	//先说说其参数，gpio则为你要申请的哪一个管脚，label则是为其取一个名字。
	if(ret < 0){
		printk(KERN_EMERG "gpio_request EXYNOS4_GPL2(0) failed!\n");
		return ret;
	}
	//extern int s3c_gpio_cfgpin(uint pin,uint to);
	//uint pin选择管脚，此处可以从exynos4412头文件得知，uint to为输入输出模式
	s3c_gpio_cfgpin(EXYNOS4_GPL2(0),S3C_GPIO_OUTPUT);
	//#define S3C_GPIO_OUTPUT (S3C_GPIO_SPECIAL(1))
	gpio_set_value(EXYNOS4_GPL2(0),0);
	
	misc_register(&hello_dev);
	
	return 0;
}

static int hello_remove(struct platform_device *pdv){
	
	printk(KERN_EMERG "\tremove\n");
	misc_deregister(&hello_dev);
	return 0;
}

static void hello_shutdown(struct platform_device *pdv){
	
	;
}

static int hello_suspend(struct platform_device *pdv,pm_message_t pmt){
	
	return 0;
}

static int hello_resume(struct platform_device *pdv){
	
	return 0;
}

struct platform_driver hello_driver = {
	.probe = hello_probe,
	.remove = hello_remove,
	.shutdown = hello_shutdown,
	.suspend = hello_suspend,
	.resume = hello_resume,
	.driver = {
		.name = DRIVER_NAME,
		.owner = THIS_MODULE,
	}
};










static int hello_init(void)
{
	int DriverState;
	
	printk(KERN_EMERG "HELLO WORLD enter!\n");
	DriverState = platform_driver_register(&hello_driver);
	
	printk(KERN_EMERG "\tDriverState is %d\n",DriverState);
	return 0;
}


static void hello_exit(void)
{
	printk(KERN_EMERG "HELLO WORLD exit!\n");
	
	platform_driver_unregister(&hello_driver);	
}

module_init(hello_init);
module_exit(hello_exit);
#include 

#include 
#include 
#include 
#include 
#include 

main(){
	int fd;
	char *hello_node = "/dev/hello_ctl";
	
/*O_RDWR只读打开,O_NDELAY非阻塞方式*/	
	if((fd = open(hello_node,O_RDWR|O_NDELAY))<0){//返回值为-1则为错误
		printf("APP open %s failed",hello_node);
	}
	else{
		printf("APP open %s success",hello_node);
		ioctl(fd,1,1);
		sleep(3);
		ioctl(fd,0,1);
		sleep(3);
		ioctl(fd,1,1);
	}
	
	close(fd);
}



	
	
}