109 lines
4.0 KiB
Groff
109 lines
4.0 KiB
Groff
.\" $NetBSD: ugen.4,v 1.1 1998/07/12 19:51:55 augustss Exp $
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.\" Copyright (c) 1998 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd July 12, 1998
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.Dt UGEN 4
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.Os
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.Sh NAME
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.Nm ugen
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.Nd USB generic device support
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.Sh SYNOPSIS
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.Cd "ugen* at uhub? port ?"
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.Pp
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for all USB devices that do not have
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a special driver. It supports access to all parts of the device,
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but not in a way that is as convenient as a special purpose driver.
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.Pp
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There can be up to 127 USB devices connected to a USB bus.
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Each USB device can have up to 16 endpoints. Each of these endpoints
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will communicate in one of four different modes: control, isochronous,
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bulk, or interrupt. Each of the endpoints will have a different
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device. The four least significant bits in the minor device
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number determines which endpoint the device access and the rest
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of the bits determines the device.
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.Pp
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To find out what endpoints that exist there are a series of
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.Xr ioctl 2
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operation on the control endpoint that returns the USB descriptors
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of the device, configuration, interface, etc.
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.Pp
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The control transfer mode can only happen on the control endpoint
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which is always endpoint 0. The control endpoint accepts request
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and may respond with an answer to such request. Control request
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are issued by
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.Xr ioctl 2
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calls.
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.Pp
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The isochronous transfer mode can be in or out depending on the
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endpoint. To perform IO on an isochronous endpoint
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.Xr read 2
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and
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.Xr write 2
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should be used.
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Before any IO operations can take place the transfer rate in
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bytes/second has to be set. This is done with
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.Xr ioctl 2
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.Dv USB_SET_ISO_RATE .
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Performing this call sets up a buffer corresponding to
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about 1 second of data.
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.Pp
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The bulk transfer mode can be in or out depending on the
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endpoint. To perform IO on a bulk endpoint
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.Xr read 2
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and
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.Xr write 2
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should be used.
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All IO operations on a bulk endpoint are unbuffered.
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.Pp
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The interrupt transfer mode can only be in.
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To perform input from an interrupt endpoint
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.Xr read 2
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should be used. A certain moderate amount of buffering is done
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by the driver.
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.Pp
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The
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.Xr select 2
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call can be used on all endpoint except the control
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endpoint.
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.Sh SEE ALSO
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.Xr usb 4
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.Sh HISTORY
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The
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.Nm
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driver
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appeared in
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.Nx 1.4 .
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