'\" t
.\"     Title: usb_calc_bus_time
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Host Controller APIs
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "USB_CALC_BUS_TIME" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Host Controller APIs"
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.SH "NAME"
usb_calc_bus_time \- approximate periodic transaction time in nanoseconds
.SH "SYNOPSIS"
.HP \w'long\ usb_calc_bus_time('u
.BI "long usb_calc_bus_time(int\ " "speed" ", int\ " "is_input" ", int\ " "isoc" ", int\ " "bytecount" ");"
.SH "ARGUMENTS"
.PP
\fIspeed\fR
.RS 4
from dev\->speed; USB_SPEED_{LOW,FULL,HIGH}
.RE
.PP
\fIis_input\fR
.RS 4
true iff the transaction sends data to the host
.RE
.PP
\fIisoc\fR
.RS 4
true for isochronous transactions, false for interrupt ones
.RE
.PP
\fIbytecount\fR
.RS 4
how many bytes in the transaction\&.
.RE
.SH "RETURN"
.PP
Approximate bus time in nanoseconds for a periodic transaction\&.
.SH "NOTE"
.PP
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\&.
.SH "COPYRIGHT"
.br