Ubuntu驱动demo

1. 查看系统版本号：

    evidence@evidence-VirtualBox:~/DriverTest$ uname -r
3.2.0-64-generic-pae

2. 编写Hello World模块

    #include <linux/init.h>  
    #include <linux/module.h>  
    
    MODULE_LICENSE("Dual BSD/GPL");  
      
    static int hellodriver_init(void)  
    {  
          printk(KERN_ALERT "hellodriver.driver world \n");  
          return 0;  
    }  
      
    static void hellodriver_exit(void)  
    {  
          printk(KERN_ALERT "Goodbye,hellodriver");  
    }  
      
    module_init(hellodriver_init);  
    module_exit(hellodriver_exit);
   

3. 编写Makefile文件

    obj-m := hellodriver.o
    KERNELDIR := /lib/modules/3.2.0-64-generic-pae/build/  
    PWD := $(shell pwd)  
    modules:  
        $(MAKE) -C $(KERNELDIR) M=$(PWD) modules  
    modules_install:  
        $(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install
   

4. 编译

    evidence@evidence-VirtualBox:~/DriverTest$ cd /home/evidence/DriverTest 
    evidence@evidence-VirtualBox:~/DriverTest$ make
   

编译结果如下：

    evidence@evidence-VirtualBox:~/DriverTest$ ls -la
    total 100
    drwxrwxr-x  3 evidence evidence  4096 May 27 03:03 .
    drwxr-xr-x 28 evidence evidence  4096 May 27 02:50 ..
    -rw-rw-r--  1 evidence evidence   377 May 27 02:56 hellodriver.c
    -rw-rw-r--  1 evidence evidence  2602 May 27 03:03 hellodriver.ko
    -rw-rw-r--  1 evidence evidence   279 May 27 03:03 .hellodriver.ko.cmd
    -rw-rw-r--  1 evidence evidence   690 May 27 03:03 hellodriver.mod.c
    -rw-rw-r--  1 evidence evidence  1832 May 27 03:03 hellodriver.mod.o
    -rw-rw-r--  1 evidence evidence 26346 May 27 03:03 .hellodriver.mod.o.cmd
    -rw-rw-r--  1 evidence evidence  1932 May 27 03:03 hellodriver.o
    -rw-rw-r--  1 evidence evidence 26243 May 27 03:03 .hellodriver.o.cmd
    -rw-rw-r--  1 evidence evidence   224 May 27 04:11 Makefile
    -rw-rw-r--  1 evidence evidence    48 May 27 03:03 modules.order
    -rw-rw-r--  1 evidence evidence     0 May 27 03:03 Module.symvers
    drwxrwxr-x  2 evidence evidence  4096 May 27 03:03 .tmp_versions

5. 安装

    evidence@evidence-VirtualBox:~/DriverTest$ sudo  insmod  ./hellodriver.ko 
    evidence@evidence-VirtualBox:~/DriverTest$ sudo dmesg -c
    
    <1>[128873.191644] hellodriver.driver world 
    evidence@evidence-VirtualBox:~/DriverTest$ tree -a /sys/module/hellodriver/
    /sys/module/hellodriver/
    ├── holders
    ├── initstate
    ├── notes
    │   └── .note.gnu.build-id
    ├── refcnt
    ├── sections
    │   ├── .gnu.linkonce.this_module
    │   ├── __mcount_loc
    │   ├── .note.gnu.build-id
    │   ├── .rodata.str1.1
    │   ├── .strtab
    │   ├── .symtab
    │   └── .text
    ├── srcversion
    └── uevent
    
    3 directories, 12 files
    
    evidence@evidence-VirtualBox:~/DriverTest$ sudo  rmmod  hellodriver 
    evidence@evidence-VirtualBox:~/DriverTest$ sudo dmesg -c
    [128887.792820] Goodbye,hellodriver
    evidence@evidence-VirtualBox:~/DriverTest$