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.TH "USB_CALC_BUS_TIME" "9" "17 July 2003" "" ""

.SH NAME
usb_calc_bus_time \- approximate periodic transaction time in nanoseconds
.SH SYNOPSIS
.sp
\fB
.sp
long usb_calc_bus_time  (int \fIspeed\fB, int \fIis_input\fB, int \fIisoc\fB, int \fIbytecount\fB);
\fR
.SH "ARGUMENTS"
.TP
\fB\fIspeed\fB\fR
from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
.TP
\fB\fIis_input\fB\fR
true iff the transaction sends data to the host
.TP
\fB\fIisoc\fB\fR
true for isochronous transactions, false for interrupt ones
.TP
\fB\fIbytecount\fB\fR
how many bytes in the transaction.
.SH "DESCRIPTION"
.PP
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.
.SH "ABOUT THIS DOCUMENT"
.PP
This documentation is free software; you can redistribute
it and/or modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later
version.
.PP
This program is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
.PP
You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
MA 02111-1307 USA
.PP
For more details see the file COPYING in the source
distribution of Linux.
.PP
If you have comments on the formatting of this manpage, then please contact
Michael Still (mikal@stillhq.com).
.PP
This documentation was generated with kernel version 2.5.71.