struct usb_device_id usbmouse_id_table []=USB_INTERFACE_INFO(cl,sc,pr);          

struct usb_device *dev=interface_to_usbdev(intf);  

pipe=usb_rcvintpipe(dev,endpoint);

usb_deregister(struct usb_driver *driver);

usb_deregister(struct usb_driver *driver);

*usb_buffer_alloc(struct usb_device *dev,size_t size,gfp_t mem_flags,dma_addr_t *dma);

struct urb *usb_alloc_urb(int iso_packets, gfp_t mem_flags);

struct urb
{... ...struct usb_device *dev;             //指向usb设备struct usb_host_endpoint *ep;    //指向端点的数据结构 unsigned int pipe;                  //指向端点管道(pipe), 本节的pipe通过usb_rcvintpipe()宏获取 int status;                                 //状态,当status==0,表示数据被成功地收到/发送
 unsigned int transfer_flags;     //传输状态... ...
/*以下两个缓冲区通过usb_buffer_alloc ()函数获取 */
//urb结构体默认的transfer_flags是URB_NO_SETUP_DMA_MAP ,也就是说没有提供DMA的缓冲区
//就会使用transfer_buffer虚拟地址缓冲区来当缓冲区
//当支持DMA缓冲区时,就需要手动设置transfer_flags =URB_NO_TRANSFER_DMA_MAP,并手动设置transfer_dma等于获取到的DMA物理地址 void *transfer_buffer;                //虚拟缓冲区dma_addr_t transfer_dma;          //DMA物理缓冲区
... ...
};

void usb_free_urb(struct urb *urb);

static inline void usb_fill_int_urb(struct urb *urb,struct usb_device *dev,unsigned int pipe,　　　　　　　　　　　　　　　　　　　　　　void *transfer_buffer,int buffer_length, usb_complete_t complete_fn,void *context,int interval);

int usb_submit_urb(struct urb *urb,gfp_t mem_flags);

void usb_kill_urb(struct urb *urb);

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb/input.h>
#include <linux/hid.h>static struct input_dev *myusb_mouse_dev;              //input_dev static char *myusb_mouse_buf;                         //虚拟地址缓存区
static dma_addr_t myusb_mouse_phyc;                     //DMA缓存区;static __le16 myusb_mouse_size;                        //数据包长度static struct urb  *myusb_mouse_urb;                     //urbstatic void myusb_mouse_irq(struct urb *urb)               //鼠标中断函数
{static char buf1=0;//for(i=0;i<myusb_mouse_size;i++)// printk("%02x  ",myusb_mouse_buf[i]);
 //  printk("\n");/*bit 1-左右中键  0X01:左键   0X02:右键     0x04:中键   */if((buf1&(0X01))    !=      (myusb_mouse_buf[1]&(0X01))){         input_report_key(myusb_mouse_dev, KEY_L, buf1&(0X01)? 1:0);input_sync(myusb_mouse_dev);  }if((buf1&(0X02))    !=    (myusb_mouse_buf[1]&(0X02))){input_report_key(myusb_mouse_dev, KEY_S, buf1&(0X02)? 1:0);input_sync(myusb_mouse_dev);  }if((buf1&(0X04))    !=    (myusb_mouse_buf[1]&(0X04))  ){input_report_key(myusb_mouse_dev, KEY_ENTER, buf1&(0X04)? 1:0);input_sync(myusb_mouse_dev);  }buf1=myusb_mouse_buf[1];                                   //更新数据
usb_submit_urb(myusb_mouse_urb, GFP_KERNEL);
}static int myusb_mouse_probe(struct usb_interface *intf, const struct usb_device_id *id)
{struct usb_device *dev = interface_to_usbdev(intf);             //设备struct usb_endpoint_descriptor *endpoint;                            struct usb_host_interface *interface;                         //当前接口int pipe;                                                   //端点管道interface=intf->cur_altsetting;                                                                   endpoint = &interface->endpoint[0].desc;                                    //当前接口下的端点描述符
   printk("VID=%x,PID=%x\n",dev->descriptor.idVendor,dev->descriptor.idProduct); //打印VID,PID/*   1)分配一个input_dev结构体  */myusb_mouse_dev=input_allocate_device();/*   2)设置input_dev支持L、S,回车、3个按键事件*/set_bit(EV_KEY, myusb_mouse_dev->evbit);set_bit(EV_REP, myusb_mouse_dev->evbit);        //支持重复按功能
set_bit(KEY_L, myusb_mouse_dev->keybit);       set_bit(KEY_S, myusb_mouse_dev->keybit);set_bit(KEY_ENTER, myusb_mouse_dev->keybit);    /*   3)注册input_dev结构体*/input_register_device(myusb_mouse_dev);/*   4)设置USB数据传输 *//*->4.1)通过usb_rcvintpipe()创建一个端点管道*/pipe=usb_rcvintpipe(dev,endpoint->bEndpointAddress); /*->4.2)通过usb_buffer_alloc()申请USB缓冲区*/myusb_mouse_size=endpoint->wMaxPacketSize;myusb_mouse_buf=usb_buffer_alloc(dev,myusb_mouse_size,GFP_ATOMIC,&myusb_mouse_phyc);/*->4.3)通过usb_alloc_urb()和usb_fill_int_urb()申请并初始化urb结构体 */myusb_mouse_urb=usb_alloc_urb(0,GFP_KERNEL);usb_fill_int_urb (myusb_mouse_urb,                       //urb结构体dev,                           //usb设备pipe,                          //端点管道myusb_mouse_buf,               //缓存区地址myusb_mouse_size,              //数据长度myusb_mouse_irq,               //中断函数0,endpoint->bInterval);          //中断间隔时间/*->4.4) 因为我们2440支持DMA,所以要告诉urb结构体,使用DMA缓冲区地址*/myusb_mouse_urb->transfer_dma   =myusb_mouse_phyc;             //设置DMA地址myusb_mouse_urb->transfer_flags   =URB_NO_TRANSFER_DMA_MAP;     //设置使用DMA地址/*->4.5)使用usb_submit_urb()提交urb*/usb_submit_urb(myusb_mouse_urb, GFP_KERNEL);return 0;
}static void myusb_mouse_disconnect(struct usb_interface *intf)
{struct usb_device *dev = interface_to_usbdev(intf);                  //设备
usb_kill_urb(myusb_mouse_urb);usb_free_urb(myusb_mouse_urb);usb_buffer_free(dev, myusb_mouse_size, myusb_mouse_buf,myusb_mouse_phyc);input_unregister_device(myusb_mouse_dev);         //注销内核中的input_devinput_free_device(myusb_mouse_dev);             //释放input_dev
} static struct usb_device_id myusb_mouse_id_table [] = {{ USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID,                 //接口类:hid类USB_INTERFACE_SUBCLASS_BOOT,             //子类:启动设备类USB_INTERFACE_PROTOCOL_MOUSE) },      //USB协议:鼠标协议
};static struct usb_driver myusb_mouse_drv = {.name            = "myusb_mouse",.probe           = myusb_mouse_probe,                           .disconnect     = myusb_mouse_disconnect,.id_table  = myusb_mouse_id_table,
};/*入口函数*/
static int myusb_mouse_init(void)
{usb_register(&myusb_mouse_drv);return 0;
}/*出口函数*/
static void myusb_mouse_exit(void)
{usb_deregister(&myusb_mouse_drv);
}module_init(myusb_mouse_init);
module_exit(myusb_mouse_exit);
MODULE_LICENSE("GPL");