static void *sample_probe(struct usb_device *udev, unsigned int ifnum, const struct usb_device_id *id) { 　/* 　* The probe procedure is pretty standard. Device matching has already 　* been performed based on the id_table structure (defined later) 　*/ 　struct usb_interface *iface; 　struct usb_interface_descriptor *interface; 　struct usb_endpoint_descriptor *endpoint; 　struct sample_device *sample; 　printk(KERN_INFO "usbsample: probe called for %s device\n",(char *)id->driver_info /* "mouse" or "keyboard" */ ); 　iface = &udev->actconfig->interface[ifnum]; 　interface = &iface->altsetting[iface->act_altsetting]; 　if (interface->bNumEndpoints != 1) return NULL; 　endpoint = interface->endpoint + 0; 　if (!(endpoint->bEndpointAddress & 0x80)) return NULL; 　if ((endpoint->bmAttributes & 3) != 3) return NULL; 　usb_set_protocol(udev, interface->bInterfaceNumber, 0); 　usb_set_idle(udev, interface->bInterfaceNumber, 0, 0); 　/* allocate and zero a new data structure for the new device */ 　sample = kmalloc(sizeof(struct sample_device), GFP_KERNEL); 　if (!sample) return NULL; /* failure */ 　memset(sample, 0, sizeof(*sample)); 　sample->name = (char *)id->driver_info; 　/* fill the URB data structure using the FILL_INT_URB macro */ 　{ 　　int pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress); 　　int maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe)); 　　if (maxp > 8) maxp = 8; sample->maxp = maxp; /* remember for later */ 　　FILL_INT_URB(&sample->urb, udev, pipe, sample->data, maxp, 　　sample_irq, sample, endpoint->bInterval); 　} 　/* register the URB within the USB subsystem */ 　if (usb_submit_urb(&sample->urb)) { 　　kfree(sample); 　　return NULL; 　} 　/* announce yourself */ 　printk(KERN_INFO "usbsample: probe successful for %s (maxp is %i)\n",sample->name, sample->maxp); 　/* 　* here you might MOD_INC_USE_COUNT; if you do, you'll need to unplug 　* the device or the devices before being able to unload the module 　*/ 　/* and return the new structure */ 　return sample; }

　　在网络设备驱动的编写中，我们特别关心的就是数据的收、发及中断。网络设备驱动程序的层次如下：

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