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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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