/*
本文件目標:
1.學習字符設備驅動??注冊主次設備
2.用IO內存直接驅動GPIO?LED
*/
#include?
#include?
#include?
#include?//主次設備
#include?

#include?//釋放和分配設備編號
#include?//字符設備驅動
#include?//分配scull內存使用
#include?//包含device_create函數??class結構體的頭文件
//IO端口分配以及IO內存分配??ARM內核中與IO內存一樣
#include?
//IO內存讀寫
#include?
//CPU?物理地址
#include?
//copy_to_user函數頭文件
#include?

#define?CHRDEV_NAME?“tarkelc_chrdev“//所分配設備號的名稱
#define?DEVICE_NAME?“tarkelc_learn“//設備節點名稱（在/dev中）
#define?DRIVER_NAME?“mygpio“
#define?CLASS_NAME??“tarkelc_class“///sys/class中可查到
#define?Myled2?EXYNOS4_GPL2（0）
#define?Myled3?EXYNOS4_GPK1（1）

#define?GPL2base_PA?（EXYNOS4_PA_GPIO2+0x0100）
#define?GPK1base_PA?（EXYNOS4_PA_GPIO2+0x0060）
#define?GPL2LEN_PA??（0X20）
#define?GPK1LEN_PA??（0X20）

dev_t?mdev_t;

void?*p1;

char?buffer[1024];

static?struct?class?*myclass;

//操作SPI寄存器結構體
typedef?struct{
	unsigned?long?CON;	//0x00
	unsigned?long?DAT;	//0x04
	unsigned?long?PUD;	//0x08
	unsigned?long?DRV;	//0x0c
	unsigned?long?CONPND;	//0x10
	unsigned?long?PUDPDN;	//0x14
	unsigned?long?RESERVED;	//0x18
	unsigned?long?RESERVED1;	//0x1c
}GPIO_TypeDef;
GPIO_TypeDef?*GPL2;

/*?表示每一個設備?*/
struct?scull_dev?{
	char?*data;
	unsigned?int?size;
	struct?cdev?cdev;
};
struct?scull_dev?*mydevice;

static?ssize_t?myspi_read（struct?file?*f?char?__user?*buf?size_t?len?loff_t?*loff）
{
	int?ret=0;
	/*char?*pp;//
	pp=buffer;
	for（ret=0;（ret		*pp=（char）ret;
		pp++;
	}*/
	ret=copy_to_user（bufbufferlen）;
	if（ret!=0）{
		return?-1;
	}
	return?len;
}

static?ssize_t?myspi_write（struct?file?*f?const?char?__user?*buf?size_t?len?loff_t?*loff）
{
	int?ret;
	ret=copy_from_user（bufferbuflen）;
	if（ret!=0）{
		return?-1;
	}
	return?len;
}

static?int?myspi_open（struct?inode?*?node?struct?file?*f）?{
	
	printk（KERN_ALERT?“myspi?open!“）;
	return?0;
}

static?int?myspi_release（struct?inode?*node?struct?file?*f）{
	printk（KERN_ALERT?“myspi?release!“）;
	return?0;
}

/*?暫時用于debug?*/
static?long?myspi_ioctl（struct?file?*f?unsigned?int?cmd?unsigned?long?arg）
{
	int?stateret;
	state=ioread32（&GPL2->DAT）;
	iowrite32（state|0x00000001&GPL2->DAT）;//配置IO輸出高電平
	if（cmd==0）{
		state=ioread32（&GPL2->DAT）;
		ret=state&0x01;
		if（ret!=0）{
			iowrite32（state&0xfffffffe&GPL2->DAT）;//配置IO輸出低電平
		}
		else?{
			iowrite32（state|0x00000001&GPL2->DAT）;//配置IO輸出高電平
		}
		return?0;
	}
	else?{
		
	}
	return?0;
}

struct?file_operations?my_fops={
	.owner?=?THIS_MODULE
	.read?=?myspi_read
	.write?=?myspi_write
	.open?=?myspi_open
	.release?=?myspi_release
	.unlocked_ioctl?=?myspi_ioctl
};

/*?自定義函數?*/
static?void?gpio_init（void）
{
	unsigned?int?state;
	//GPL2base寄存器向IO內存的映射
	if（request_mem_region（GPL2base_PAGPL2LEN_PADRIVER_NAME）==

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2016-04-19?22:23??資源\
?????目錄???????????0??2016-04-19?22:23??資源\MyledsTest\
?????文件?????????475??2016-03-13?21:46??資源\MyledsTest\.classpath
?????文件????????3683??2016-03-13?22:00??資源\MyledsTest\.cproject
?????文件????????1470??2016-03-13?22:00??資源\MyledsTest\.project
?????目錄???????????0??2016-04-19?22:22??資源\MyledsTest\.settings\
?????文件?????????177??2016-03-13?21:46??資源\MyledsTest\.settings\org.eclipse.jdt.core.prefs
?????文件?????????865??2016-03-13?21:46??資源\MyledsTest\AndroidManifest.xml
?????目錄???????????0??2016-04-19?22:25??資源\MyledsTest\assets\
?????目錄???????????0??2016-04-19?22:22??資源\MyledsTest\bin\
?????文件?????????865??2016-03-13?21:46??資源\MyledsTest\bin\AndroidManifest.xml
?????文件??????776031??2016-04-19?22:17??資源\MyledsTest\bin\MyledsTest.apk
?????文件???????30735??2016-04-19?22:16??資源\MyledsTest\bin\R.txt
?????目錄???????????0??2016-04-19?22:22??資源\MyledsTest\bin\classes\
?????目錄???????????0??2016-04-19?22:22??資源\MyledsTest\bin\classes\android\
?????目錄???????????0??2016-04-19?22:22??資源\MyledsTest\bin\classes\android\support\
?????目錄???????????0??2016-04-19?22:22??資源\MyledsTest\bin\classes\android\support\v7\
?????目錄???????????0??2016-04-19?22:22??資源\MyledsTest\bin\classes\android\support\v7\appcompat\
?????文件?????????629??2016-04-19?22:16??資源\MyledsTest\bin\classes\android\support\v7\appcompat\R$anim.class
?????文件????????5136??2016-04-19?22:16??資源\MyledsTest\bin\classes\android\support\v7\appcompat\R$attr.class
?????文件?????????763??2016-04-19?22:16??資源\MyledsTest\bin\classes\android\support\v7\appcompat\R$bool.class
?????文件?????????594??2016-04-19?22:16??資源\MyledsTest\bin\classes\android\support\v7\appcompat\R$color.class
?????文件????????1530??2016-04-19?22:16??資源\MyledsTest\bin\classes\android\support\v7\appcompat\R$dimen.class
?????文件????????5191??2016-04-19?22:16??資源\MyledsTest\bin\classes\android\support\v7\appcompat\R$drawable.class
?????文件????????2556??2016-04-19?22:16??資源\MyledsTest\bin\classes\android\support\v7\appcompat\R$id.class
?????文件?????????445??2016-04-19?22:16??資源\MyledsTest\bin\classes\android\support\v7\appcompat\R$integer.class
?????文件????????1629??2016-04-19?22:16??資源\MyledsTest\bin\classes\android\support\v7\appcompat\R$layout.class
?????文件????????1141??2016-04-19?22:16??資源\MyledsTest\bin\classes\android\support\v7\appcompat\R$string.class
?????文件????????9582??2016-04-19?22:16??資源\MyledsTest\bin\classes\android\support\v7\appcompat\R$style.class
?????文件????????6541??2016-04-19?22:16??資源\MyledsTest\bin\classes\android\support\v7\appcompat\R$styleable.class
?????文件????????1015??2016-04-19?22:16??資源\MyledsTest\bin\classes\android\support\v7\appcompat\R.class
............此處省略102個文件信息