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1、pos机装驱动
pos机装驱动
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
//使用宋宝华推荐的普通字符设备框架
#include <linux/fcntl.h>
#include <linux/cdev.h>
#include <linux/version.h>
#include <linux/vmalloc.h>
#include <linux/ctype.h>
#include <linux/pagemap.h>
#include <linux/device.h>
#include <asm/io.h>
//#include <asm/arch/regs-gpio.h> //2.6.12
#include <mach/regs-gpio.h> // 2.6.32
//LED1
#define LED1_OUT __raw_writel(( __raw_readl(S3C2410_GPBCON) & (~(3<<10)))|(1<<10),S3C2410_GPBCON) //
#define LED1_H __raw_writel(__raw_readl(S3C2410_GPBDAT)|(1<<5),S3C2410_GPBDAT)
#define LED1_L __raw_writel(__raw_readl(S3C2410_GPBDAT)&(~(1<<5)),S3C2410_GPBDAT)
//LED2
#define LED2_OUT __raw_writel(( __raw_readl(S3C2410_GPBCON) & (~(3<<12)))|(1<<12),S3C2410_GPBCON) //
#define LED2_H __raw_writel(__raw_readl(S3C2410_GPBDAT)|(1<<6),S3C2410_GPBDAT)
#define LED2_L __raw_writel(__raw_readl(S3C2410_GPBDAT)&(~(1<<6)),S3C2410_GPBDAT)
//LED3
#define LED3_OUT __raw_writel(( __raw_readl(S3C2410_GPBCON) & (~(3<<14)))|(1<<14),S3C2410_GPBCON) //
#define LED3_H __raw_writel(__raw_readl(S3C2410_GPBDAT)|(1<<7),S3C2410_GPBDAT)
#define LED3_L __raw_writel(__raw_readl(S3C2410_GPBDAT)&(~(1<<7)),S3C2410_GPBDAT)
//LED4
#define LED4_OUT __raw_writel(( __raw_readl(S3C2410_GPBCON) & (~(3<<16)))|(1<<16),S3C2410_GPBCON) //
#define LED4_H __raw_writel(__raw_readl(S3C2410_GPBDAT)|(1<<8),S3C2410_GPBDAT)
#define LED4_L __raw_writel(__raw_readl(S3C2410_GPBDAT)&(~(1<<8)),S3C2410_GPBDAT)
#define LEDOFF 0
#define LEDON 1
//#define DEMO_MAJOR 235 //静态分配
#define DEMO_MAJOR 0 //动态分配
#define DEMO_MINOR 0
int devmajor = DEMO_MAJOR;
int devminor = DEMO_MINOR;
dev_t dev = 0;
//设备结构
//设备结构
struct DEMO_dev
{
struct cdev cdev; /* Char device structure*/
};
struct DEMO_dev *DEMO_devices;
struct class *led_class;
int DEMO_open(struct inode *inode, struct file *filp)
{
struct DEMO_dev *demo_dev;
unsigned int temp;
filp->private_data=DEMO_devices;
//5
//LED1_OUT;
temp=__raw_readl(S3C2410_GPBCON); //__raw_readl函数在#include <asm/io.h> 定义
temp &= (~(3<<10))|(1<<10);
__raw_writel(temp,S3C2410_GPBCON);
//printk("S3C2410_GPBCON=%x,S3C2410_GPBDAT=%x\",S3C2410_GPBCON,S3C2410_GPBDAT);
//S3C2410_GPBCON=fb000010,S3C2410_GPBDAT=fb000014
//6
//LED2_OUT;
temp=__raw_readl(S3C2410_GPBCON);
temp &= (~(3<<12))|(1<<12);
__raw_writel(temp,S3C2410_GPBCON);
//7
// LED3_OUT;
temp=__raw_readl(S3C2410_GPBCON);
temp &= (~(3<<14))|(1<<14);
__raw_writel(temp,S3C2410_GPBCON);
//8
//LED4_OUT;
temp=__raw_readl(S3C2410_GPBCON);
temp &= (~(3<<16))|(1<<16);
__raw_writel(temp,S3C2410_GPBCON);
return 0;
}
int DEMO_release(struct inode *inode, struct file *filp)
{
return 0;
}
int DEMO_ioctl(struct inode *inode, struct file *filp,unsigned int cmd, unsigned long arg)
{
unsigned int temp;
//printk("**********arg=%d**************\",arg);
switch(cmd)
{
case LEDOFF:
{
if(arg == 1)
{
//printk("ioctl LED1_OFF successfully\");
//LED1_H;
temp=__raw_readl(S3C2410_GPBDAT);
temp|=(1<<5);
__raw_writel(temp,S3C2410_GPBDAT);
}
if(arg == 2)
{
//printk("ioctl LED2__OFF successfully\");
LED2_H;
}
if(arg == 3)
{
//printk("ioctl LED3_OFF successfully\");
LED3_H;
}
if(arg == 4)
{
//printk("ioctl LED4_OFF successfully\");
LED4_H;
}
return 0;
}
case LEDON:
{
if(arg == 1)
{
//printk("ioctl LED1_ON successfully\");
//LED1_L;
temp=__raw_readl(S3C2410_GPBDAT);
temp&=~(1<<5);
__raw_writel(temp,S3C2410_GPBDAT);
}
if(arg == 2)
{
//printk("ioctl LED2_ON successfully\");
LED2_L;
}
if(arg == 3)
{
//printk("ioctl LED3_ON successfully\");
LED3_L;
}
if(arg == 4)
{
//printk("ioctl LED4_ON successfully\");
LED4_L;
}
return 0;
}
default:
printk("ioctl error successfully\");
return -EFAULT;
}
}
//也可以使用DEMO_write来替代DEMO_ioctl
ssize_t DEMO_write(struct file *filp, const char __user *buf, size_t count, loff_t *f_pos)
{
int cmd;
int temp;
if(copy_from_user(&cmd,buf,4))
{
printk("copy_from_user erro\");
return -EFAULT;
}
printk("cmd=%d\",cmd);
switch(cmd)
{
case LEDOFF:
{
//printk("ioctl LEDOFF successfully\");
//LED1_H;
temp=__raw_readl(S3C2410_GPBDAT);
temp|=(1<<5);
__raw_writel(temp,S3C2410_GPBDAT);
return 0;
}
case LEDON:
{
//printk("ioctl LEDON successfully\");
LED1_L;
return 0;
}
default:
// printk("ioctl error successfully\");
return -EFAULT;
}
}
ssize_t DEMO_read(struct file *filp,char __user *buff,size_t size,loff_t *offp)
{
int count;
count = sizeof(int);
int temp;
int status;
temp=__raw_readl(S3C2410_GPBDAT);
if(temp&(1<<5)==0)
status=0;
else
status=1;
if (copy_to_user(buff, &status, count))
{
return -EFAULT;
}
return 0;
}
struct file_operations DEMO_fops = {
.owner = THIS_MODULE,
.ioctl = DEMO_ioctl,
.open = DEMO_open,
.write = DEMO_write,
.read = DEMO_read,
.release=DEMO_release,
};
/*******************************************************
MODULE ROUTINE
*******************************************************/
//卸载
void DEMO_cleanup_module(void)
{
//dev_t devno = MKDEV(DEMO_MAJOR, DEMO_MINOR);
if (DEMO_devices)
{
cdev_del(&DEMO_devices->cdev);//5 从系统中移除一个字符设备
kfree(DEMO_devices);
}
device_destroy(led_class, MKDEV(devmajor, 0)); //delete device node under /dev
class_destroy(led_class); //delete class created by us
unregister_chrdev_region(dev,1);// 6 释放设备编号
}
//挂载
int DEMO_init_module(void)
{
int result;
if(devmajor)
{
dev = MKDEV(devmajor, devminor); // 1 获得设备号
result = register_chrdev_region(dev, 1, "led"); // 2 分配设备编号
}
else
{
result = alloc_chrdev_region(&dev, devminor, 1, "led_driver");
// //2 动态分配设备编号
devmajor = MAJOR(dev);
}
if (result < 0)
{
printk(KERN_WARNING "scull: can't get major %d\", devmajor);
return result;
}
printk(KERN_WARNING "led get major: %d\", devmajor);
DEMO_devices = kmalloc(sizeof(struct DEMO_dev), GFP_KERNEL);//分配内存给本设备结构体
if (!DEMO_devices)
{
result = -ENOMEM;
goto fail;
}
memset(DEMO_devices, 0, sizeof(struct DEMO_dev));
cdev_init(&DEMO_devices->cdev, &DEMO_fops);//（1） // 字符设备的注册，即将结构嵌入到自己的设备中
DEMO_devices->cdev.owner = THIS_MODULE;
DEMO_devices->cdev.ops = &DEMO_fops; //(2)
result = cdev_add (&DEMO_devices->cdev, dev, 1);// 4 把本设备放内核中
if(result)
{
printk(KERN_NOTICE "Error %d adding DEMO\", result);
goto fail;
}
//创建节点方法2 使用函数自动创建 方法1是手动创建#mknod /dev/test c 235 0
// 下面方法2.6.32支持。2.6.18 2.6.12不支持
/* create your own class under /sysfs 2.6.32*/
led_class = class_create(THIS_MODULE, "led_class");
if(IS_ERR(led_class))
{
printk("Err: failed in creating class.\");
return -1;
}
/* register your own device in sysfs, and this will cause udev to create corresponding device node */
device_create( led_class, NULL, MKDEV(devmajor, 0), NULL, "led_driver");
return 0;
fail:
DEMO_cleanup_module(); //注销
return result;
}
module_init(DEMO_init_module); //注册
module_exit(DEMO_cleanup_module); //注销
MODULE_AUTHOR("hui");
MODULE_LICENSE("GPL");
/*****************************************************************
mini2440 应用程序测试源代码：
*****************************************************************/
//#bash-2.05b# insmod led.ko
//Using led.ko
//#bash-2.05b# ./user
//#bash-2.05b# mknod /dev/led_su c 235 0
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define MYLED "/dev/led_driver"
void Delay_MS( unsigned int time) //50 ns
{
unsigned int i,j;
for ( i=0; i<time; i++)
{
for(j=0;j<30000;j++)
{
}
}
}
int main(void)
{
int fd,i=0;
int cmd;
int status;
fd = open(MYLED,O_RDWR,0666);
if (fd < 0)
{
perror("open device led_driver error\");
exit(1);
}
printf("open device led_driver success!\");
while(i<9)
{
ioctl(fd, 1, 1);
ioctl(fd, 1, 2);
ioctl(fd, 1, 3);
ioctl(fd, 1, 4);
//sleep(1);
Delay_MS(200);
ioctl(fd, 0, 1);
ioctl(fd, 0, 2);
ioctl(fd, 0, 3);
ioctl(fd, 0, 4);
i++;
}
close(fd);
return 0;
}
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