[linux-usb-devel] Fx2000 scanner driver

[Ing. Giorgio Alboni]

Dear usb developers,   i'm new in USB driver develop. I'm trying to write a driver for our fingerprint scanner. I start from dabusb driver and Linux device driver 2nd Ed demo usb driver. The system is able to find the scanner and call the fx2000_probe function (see code below). I wrote a inline command for test purpos. Whit this I receive the error:   ENXIO c0030300, flags 0,  urb c1580000, burb c1580000   Where is the problem? T.I.A.   Giorgio Alboni     static void *fx2000_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 fx2000_device *scanner;  int err;  int pipe,maxp;    dbg("fx2000: probe: vendor id 0x%x, device id 0x%x ifnum:%d",    udev->descriptor.idVendor, udev->descriptor.idProduct, ifnum);    /* We don't handle multiple configurations */  if (udev->descriptor.bNumConfigurations != 1)   return NULL;    /* allocate and zero a new data structure for the new device */  scanner = kmalloc(sizeof(struct fx2000_device), GFP_KERNEL);  printk(KERN_INFO "Fx2000: memory=%i\n",scanner);  if (!scanner) return NULL; /* failure */  memset(scanner, 0, sizeof(*scanner));    /* fill the URB data structure using the FILL_INT_URB macro */  pipe = usb_sndbulkpipe(udev,6);  maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));    printk(KERN_INFO "Fx2000: maxpacket=%i\n",maxp);  if (maxp > 64) maxp = 64;    FILL_BULK_URB(&scanner->sendUrb, udev, pipe, scanner->pipeOut, maxp, NULL, scanner);    pipe = usb_rcvbulkpipe(udev,5);    FILL_BULK_URB(&scanner->receiveUrb, udev, pipe, scanner->pipeIn, maxp, NULL, scanner);    // test command to scanner  scanner->pipeOut[0]=0x00;  scanner->pipeOut[1]=0x00; ......... // fill buffer  scanner->pipeOut[16]=0x00;  scanner->pipeOut[17]=0x00;    err=usb_submit_urb (&scanner->sendUrb);  printk(KERN_INFO "Fx2000: send pipe=%i\n",err);  /*err=usb_submit_urb (&scanner->receiveUrb);  printk(KERN_INFO "Fx2000: recv pipe=%i\n",err);*/    /* register the URB within the USB subsystem */  if (usb_submit_urb(&scanner->sendUrb))  {   kfree(scanner);   return NULL;  }  /* announce yourself */  printk(KERN_INFO "Fx2000: probe successful\n");    /*   * 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 scanner; }