ubuntu a

[android]代码库

#include <linux/init.h>  
#include <linux/module.h>  
#include <linux/types.h>  
#include <linux/fs.h>  
#include <linux/proc_fs.h>  
#include <linux/device.h>  
#include <asm/uaccess.h>  
  
#include "hello.h"  
  
/*主设备和从设备号变量*/  
static int hello_major = 0;  
static int hello_minor = 0;  
  
/*设备类别和设备变量*/  
static struct class* hello_class = NULL;  
static struct hello_android_dev* hello_dev = NULL;  
  
/*传统的设备文件操作方法*/  
static int hello_open(struct inode* inode, struct file* filp);  
static int hello_release(struct inode* inode, struct file* filp);  
static ssize_t hello_read(struct file* filp, char __user *buf, size_t count, loff_t* f_pos);  
static ssize_t hello_write(struct file* filp, const char __user *buf, size_t count, loff_t* f_pos);  
  
/*设备文件操作方法表*/  
static struct file_operations hello_fops = {  
    .owner = THIS_MODULE,  
    .open = hello_open,  
    .release = hello_release,  
    .read = hello_read,  
    .write = hello_write,   
};  
  
/*访问设置属性方法*/  
static ssize_t hello_val_show(struct device* dev, struct device_attribute* attr,  char* buf);  
static ssize_t hello_val_store(struct device* dev, struct device_attribute* attr, const char* buf, size_t count);  
  
/*定义设备属性*/  
static DEVICE_ATTR(val, S_IRUGO | S_IWUSR, hello_val_show, hello_val_store);