usb_string_descriptor
struct usb_string_descriptor *s_desc;
s_desc = (struct usb_string_descriptor *)strings->serial;
s_desc = (struct usb_string_descriptor *)strings->product;
s_desc = (struct usb_string_descriptor *)strings->manufacturer;
struct usb_string_descriptor *s = buf;
struct usb_string_descriptor *sdesc = buf;
struct usb_string_descriptor *s_desc;
s_desc = (struct usb_string_descriptor *)desc;
return ((struct usb_string_descriptor *)desc)->bLength;