interface_to_usbdev

Keep on going with my usb fx2 linux driver
I had the following code to the probe method :

  1: void printHelper (char *pValueToPrint , char * description )
  2: {
  3:   if (pValueToPrint != NULL )
  4:   {
  5:      printk(KERN_INFO "%s :%s",description,pValueToPrint);
  6:   }
  7: }
  8: static int ml_probe(struct usb_interface *interface, const struct usb_device_id  *id)
  9: {
 10:   char *product;
 11:   char *manufacturer;
 12:   char *serial;
 13:     /* called when a USB device is connected to the computer. */
 14:     printk(KERN_INFO "ml_probe");
 15:     struct usb_device *udev = interface_to_usbdev(interface);
 16:     
 17:     
 18:       /* static strings from the device */
 19:   product = udev->product;
 20:   printHelper (product , "product");
 21:   
 22:   manufacturer = udev->manufacturer;
 23:   printHelper (manufacturer , "manufacturer");
 24:   
 25:   serial = udev->serial;
 26:   printHelper (serial , "serial");
 27:   
 28: return 0;
 29: 
 30: }

and the result :

[10871.554417] Initializing USB FX
[10871.554451] usbcore: registered new interface driver myFx2
[10871.554454] THE usb_register RET::0
[11033.435093] usb 1-1.1: new high-speed USB device number 4 using ehci_hcd
[11048.458267] usb 1-1.1: device descriptor read/64, error -110
[11063.585105] usb 1-1.1: device descriptor read/64, error -110
[11063.760533] usb 1-1.1: new high-speed USB device number 5 using ehci_hcd
[11078.783705] usb 1-1.1: device descriptor read/64, error -110
[11088.005908] hub 1-1:1.0: unable to enumerate USB device on port 1
[11127.297879] usb 1-1.1: new high-speed USB device number 6 using ehci_hcd
[11128.846084] ml_probe
[11128.846088] product :OSR USB-FX2 LK
[11128.846090] manufacturer :OSR.COM

The code use the method :interface_to_usbdev in order to get a usb_device form usb_interface object.Using the usb_device object the code get the usb  device static report about the manufacture and the product .

Resources:
http://www.lrr.in.tum.de/Par/arch/usb/download/usbdoc/usbdoc-1.32.pdf