我的LED驱动

 #include <linux/miscdevice.h>
#include <linux/delay.h>
#include <asm/irq.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/ioctl.h>
#include <linux/cdev.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>
#include <asm/unistd.h>

#define DEV_NAME "myled"
#define ledd_major 0

//定义LED控制引脚配置

static unsigned long ledd_table[]={
 S3C2410_GPB5,
 S3C2410_GPB6,
 S3C2410_GPB7,
 S3C2410_GPB8,
};

static unsigned int ledd_cfg_table[]={
 S3C2410_GPB5_OUTP,
 S3C2410_GPB6_OUTP,
 S3C2410_GPB7_OUTP,
 S3C2410_GPB8_OUTP,
};

struct ledd_dev_t
{
 struct cdev cdev;
 //unsigned int mem;
}ledd_dev;

int ledd_open(struct inode *inode, struct file *filp)
{
 int i,ret;
 for(i=0;i<4;i++)
 {
  printk("setting pin%d configuration now/n",i);
  s3c2410_gpio_cfgpin(ledd_table[i],ledd_cfg_table[i]);
 }
 ret=nonseekable_open(inode,filp);
 printk("the open function in driver return %d/n",ret);
 return ret;
}

int ledd_release(struct inode *inode, struct file *filp)
{
 return 0;
}

static ssize_t ledd_write(struct file *filp, const char __user *buf, size_t count, loff_t *f_ops)
{
 int ret;
 int number;
 int power;
 unsigned char mem;
 printk("run the function copy_from_user()/n");
 printk("buf value is %d/n",*buf);
 if(copy_from_user(&mem,buf,1))
  ret= -EFAULT;
 else
 {
  number=(((mem)&0x0f0)>>4);//取传入实参的二进制的4到7位作为LED序号
  power=((mem)&0x01);//取传入实参的二进制的0到3位作为LED开关位，0:亮，1:灭
  printk("number is %d/n",number);
  printk("power is %d/n",power);
  s3c2410_gpio_setpin(ledd_table[number],power);
 }
 return 0;
}

static const struct file_operations ledd_fops=
{
 .owner=THIS_MODULE,
 .open= ledd_open,
 .release=ledd_release,
 .write=ledd_write,
};

static int __init ledd_init(void)
{
 int ret;
 int ma,mi;
 cdev_init(&ledd_dev.cdev, &ledd_fops);
 ledd_dev.cdev.owner=THIS_MODULE;
 ledd_dev.cdev.dev=MKDEV(ledd_major, 0);
 if (ledd_major)
 {
  register_chrdev_region(ledd_dev.cdev.dev,1,DEV_NAME);
 }
 else
 {
  alloc_chrdev_region(&ledd_dev.cdev.dev,0,1,DEV_NAME);
 }
 ma=MAJOR(ledd_dev.cdev.dev);
 mi=MINOR(ledd_dev.cdev.dev);
 printk("%d/n",ma);
 printk("%d/n",mi);
 printk("this is my led driver/n");
 ret=cdev_add(&ledd_dev.cdev,ledd_dev.cdev.dev,1);
 return ret;
}

static void __exit ledd_exit(void)
{
 printk("bye");
 unregister_chrdev_region(ledd_dev.cdev.dev,1);
 cdev_del(&ledd_dev.cdev);
}

module_init(ledd_init);
module_exit(ledd_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("YH Inc.");