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USB_CALC_BUS_TIME(9) Host Controller APIs USB_CALC_BUS_TIME(9)

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.

COPYRIGHT

May 2024 Kernel Hackers Manual 2.6.