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struct usb_skel {
struct usb_device * udev; /* the usb device for this device */
struct usb_interface * interface; /* the interface for this device */
struct semaphore limit_sem; /* limiting the number of writes in progress */
unsigned char * bulk_in_buffer; /* the buffer to receive data */
size_t bulk_in_size; /* the size of the receive buffer */
__u8  
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