124 lines
4.6 KiB
Groff
124 lines
4.6 KiB
Groff
.\" $NetBSD: guspnp.4,v 1.13 2003/03/31 03:14:32 perry Exp $
|
|
.\"
|
|
.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to The NetBSD Foundation
|
|
.\" by Kari Mettinen.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the NetBSD
|
|
.\" Foundation, Inc. and its contributors.
|
|
.\" 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
.\" contributors may be used to endorse or promote products derived
|
|
.\" from this software without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
.\" POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.Dd October 5, 1997
|
|
.Dt GUSPNP 4
|
|
.Sh NAME
|
|
.Nm guspnp
|
|
.Nd Am78C201 audio device driver
|
|
.Sh SYNOPSIS
|
|
.Cd "guspnp* at isapnp?"
|
|
.Cd "audio* at guspnp?"
|
|
.Pp
|
|
There should be no limit caused by the driver on the number of drivers
|
|
or cards active in the system.
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm guspnp
|
|
driver provides support for audio subsystems using the Interwave (Am78C20x)
|
|
family of ICs, usually the Gravis Ultrasound Plug and Play.
|
|
Unlike the
|
|
.Nm gus
|
|
driver guspnp driver does not require any local memory for the IC, but uses
|
|
the codec for both playback and recording.
|
|
The
|
|
.Nm guspnp
|
|
driver can simultaneously playback and record 8- and 16-bit samples at
|
|
frequencies from 5.51kHz to 48kHz.
|
|
.Pp
|
|
The
|
|
.Nm guspnp
|
|
driver relies on
|
|
.Nm isapnp
|
|
to allocate suitable resources for it.
|
|
This version of the driver only
|
|
uses the first logical device of the five the Interwave IC has.
|
|
The four unused
|
|
logical devices are the ATAPI CD-ROM device, PnP Joystick device, legacy
|
|
soundcard emulation device (SoundBlaster) and MIDI serial device.
|
|
Support
|
|
for at least ATAPI CD-ROM and Joystick is being worked on.
|
|
This version of the driver will use 1 IRQ and 2 DRQs.
|
|
.Sh HARDWARE
|
|
Cards supported by the
|
|
.Nm
|
|
driver include:
|
|
.Pp
|
|
.Bl -item -offset indent
|
|
.It
|
|
.Tn Gravis
|
|
Ultrasound PNP, and compatibles
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr audio 4 ,
|
|
.Xr gus 4 ,
|
|
.Xr isapnp 4
|
|
.Sh REFERENCES
|
|
Interwave(tm) IC Am78C201/202 Programmer's Guide Rev. 2. 1996. Advanced
|
|
Micro Devices.
|
|
.Sh HISTORY
|
|
The
|
|
.Nm guspnp
|
|
driver appeared in
|
|
.Nx 1.3 .
|
|
.Sh AUTHORS
|
|
.An Kari Mettinen Aq Kari.Mettinen@helsinki.fi ,
|
|
University of Helsinki.
|
|
.Sh BUGS
|
|
Sometimes you can cause a hiss on either left or right channel, or both.
|
|
You can usually make it disappear by playing random data, however this
|
|
might not be a very nice thing to your audio equipment, but it is the only
|
|
way I have found out to be effective.
|
|
.Pp
|
|
Only the Codec is used in this version of the driver, therefore only 2
|
|
channels are supported (left and right). Also sound quality is probably
|
|
worse at lower kHz compared to playing through the synthesizer which does
|
|
interpolation.
|
|
.Pp
|
|
If the implementation has a 'bad' oscillator, using frequencies 44.8kHz
|
|
and 38.4kHz will result in incorrect playback frequency. The author has
|
|
a GUS PnP Pro which displays this behavior.
|
|
.Pp
|
|
Other members of the Interwave family have not been tested and don't
|
|
have the glue needed to make them work. Should someone need to implement it,
|
|
not many changes in the existing code are needed.
|
|
Output voltage control in
|
|
register CFIG2 [7] should be set differently for some other members of the
|
|
family.
|
|
.Pp
|
|
Other architectures than i386 haven't been tested. The bus_space abstraction
|
|
has been used from the beginning, so it should work.
|