Linux驱动框架与杂项字符设备框架介绍

#include <linux>
#include <linux>
static int __init tiny4412_hello_drv_init(void){
    printk("Hello 驱动注册-安装成功.\n");
    return 0;
}
static void __exit tiny4412_hello_drv_exit(void){
    printk("Hello 驱动注销成功.\n");
}
/*驱动入口*/
module_init(tiny4412_hello_drv_init);
/*驱动出口*/
module_exit(tiny4412_hello_drv_exit);
/*许可证*/
MODULE_LICENSE("GPL");
</linux></linux>

KER_DRI=/home/wbyq/work/linux-3.5/linux-3.5
all:
    make -C $(KER_DRI) M=`pwd` modules
clean:
    make -C $(KER_DRI) M=`pwd` modules clean
obj-m += drv_hello.o

[root@wbyq ]#insmod drv_hello.ko [  435.765000] Hello 驱动注册-安装成功.
[root@wbyq ]#rmmod drv_hello.ko rmmod: can't change directory to '/lib/modules': No such file or directory
[root@wbyq ]#mkdir /lib/modules
[root@wbyq ]#rmmod drv_hello.ko rmmod: can't change directory to '3.5.0-FriendlyARM': No such file or directory
[root@wbyq ]#[root@wbyq ]#[root@wbyq ]#mkdir /lib/modules/3.5.0-FriendlyARM
[root@wbyq ]#rmmod drv_hello.ko [ 1024.225000] Hello 驱动注销成功.
[root@wbyq ]#insmod drv_hello.ko [ 1080.500000] Hello 驱动注册-安装成功.
[root@wbyq ]#lsmod
drv_hello 614 0 - Live 0xbf004000 (O)
[root@wbyq ]#modinfo drv_hello.ko modinfo: can't open '/lib/modules/3.5.0-FriendlyARM/modules.dep': No such file or directory
[root@wbyq ]#touch /lib/modules/3.5.0-FriendlyARM/modules.dep
[root@wbyq ]#modinfo drv_hello.ko filename:       drv_hello.ko
license:        GPL
depends:        
vermagic:       3.5.0-FriendlyARM SMP preempt mod_unload ARMv7 p2v8 
[root@wbyq ]#

struct miscdevice  {
    int minor;                       //次设备号，杂项设备的主设备号为10
    const char *name;                //设备的名称
    const struct file_operations *fops;   //文件操作
    /* 下面的成员是供内核使用，驱动编写不需要理会 */
    struct list_head list;      //misc_list的链表头
    struct device *parent;      //父设备
    struct device *this_device; //当前设备，是device_create的返回值
}; 

#include <linux>
#include <linux>
#include <linux>
#include <linux>
#include <linux>
#include <asm>
static volatile unsigned int *GPD0CON=NULL;
static volatile unsigned int *GPD0DAT=NULL;
static int tiny4412_open(struct inode *my_indoe, struct file *my_file){
    printk("open ok\n");
    /*设置蜂鸣器为输出模式*/
    *GPD0CON &= ~(0xf 
</asm></linux></linux></linux></linux></linux>

#include <stdio.h>
int main(int argc,char**argv){
    int fd;
    fd=open("/dev/tiny4412_hello",2); //3  0 - 1 - 2
    if(fd
</stdio.h>