linux驅動入門之自動分配主裝置號 建立裝置節點

以開發板按鍵為例，在開發板上執行

1.second_drv.c檔案

#include #include #include #include #include #include //包含class_create, device_create, ......這些程式 

#include #include #include 版本核心為此位置 
//之前版本的核心位置可能為
//#include //#include #include #include //加入兩個結構體，用來供核心自動建立主裝置號 
//主要就是在init和exit兩個函式中加入了這兩個結構體
static struct class *seconddrv_class;
static struct class_device *seconddrv_class_dev;
volatile unsigned long *gpfcon;
volatile unsigned long *gpfdat;
static int second_drv_open(struct inode *inode, struct file *file)
ssize_t second_drv_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
static struct file_operations sencod_drv_fops = ;
int major;
static int second_drv_init(void)
static void second_drv_exit(void)
module_init(second_drv_init);
module_exit(second_drv_exit);
module_license("gpl");

2.makefile

kern_dir = /home/stevenking/workspace/code/linux-2.6.39

all:
make -c $(kern_dir) m=`pwd` modules 
clean:
make -c $(kern_dir) m=`pwd` modules clean
rm -rf modules.order
obj-m += second_drv.o

#include #include #include #include /* seconddrvtest 

*/int main(int argc, char **argv)
while (1) }
return 0;
}

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