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NAME

       usb_calc_bus_time   -   approximate   periodic   transaction   time  in
       nanoseconds

SYNOPSIS

       long usb_calc_bus_time  (int speed, int is_input, int isoc,
                                 int bytecount);

ARGUMENTS

       speed  from dev->speed; USB_SPEED_{LOW,FULL,HIGH}

       is_input
              true iff the transaction sends data to the host

       isoc   true for isochronous transactions, false for interrupt ones

       bytecount
              how many bytes in the transaction.

DESCRIPTION

       Returns approximate bus time in nanoseconds for a periodic transaction.
       See USB 2.0 spec section 5.11.3; only periodic  transfers  need  to  be
       scheduled  in software, this function is only used for such scheduling.