117 lines
4.2 KiB
Groff
117 lines
4.2 KiB
Groff
.\" $NetBSD: guspnp.4,v 1.15 2008/04/30 13:10:54 martin Exp $
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.\"
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.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Kari Mettinen.
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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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.\"
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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 June 22, 2005
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.Dt GUSPNP 4
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.Sh NAME
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.Nm guspnp
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.Nd Am78C201 audio device driver
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.Sh SYNOPSIS
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.Cd "guspnp* at isapnp?"
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.Cd "audio* at audiobus?"
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.Pp
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There should be no limit caused by the driver on the number of drivers
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or cards active in the system.
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.Sh DESCRIPTION
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The
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.Nm guspnp
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driver provides support for audio subsystems using the Interwave (Am78C20x)
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family of ICs, usually the Gravis Ultrasound Plug and Play.
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Unlike the
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.Nm gus
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driver guspnp driver does not require any local memory for the IC, but uses
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the codec for both playback and recording.
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The
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.Nm guspnp
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driver can simultaneously playback and record 8- and 16-bit samples at
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frequencies from 5.51kHz to 48kHz.
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.Pp
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The
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.Nm guspnp
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driver relies on
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.Nm isapnp
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to allocate suitable resources for it.
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This version of the driver only
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uses the first logical device of the five the Interwave IC has.
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The four unused
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logical devices are the ATAPI CD-ROM device, PnP Joystick device, legacy
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soundcard emulation device (SoundBlaster) and MIDI serial device.
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Support
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for at least ATAPI CD-ROM and Joystick is being worked on.
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This version of the driver will use 1 IRQ and 2 DRQs.
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.Sh HARDWARE
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Cards supported by the
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.Nm
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driver include:
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.Pp
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.Bl -item -offset indent
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.It
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.Tn Gravis
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Ultrasound PNP, and compatibles
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.El
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.Sh SEE ALSO
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.Xr audio 4 ,
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.Xr gus 4 ,
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.Xr isapnp 4
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.Sh REFERENCES
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Interwave(tm) IC Am78C201/202 Programmer's Guide Rev. 2. 1996. Advanced
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Micro Devices.
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.Sh HISTORY
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The
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.Nm guspnp
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driver appeared in
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.Nx 1.3 .
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.Sh AUTHORS
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.An Kari Mettinen Aq Kari.Mettinen@helsinki.fi ,
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University of Helsinki.
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.Sh BUGS
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Sometimes you can cause a hiss on either left or right channel, or both.
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You can usually make it disappear by playing random data, however this
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might not be a very nice thing to your audio equipment, but it is the only
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way I have found out to be effective.
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.Pp
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Only the Codec is used in this version of the driver, therefore only 2
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channels are supported (left and right). Also sound quality is probably
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worse at lower kHz compared to playing through the synthesizer which does
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interpolation.
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.Pp
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If the implementation has a 'bad' oscillator, using frequencies 44.8kHz
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and 38.4kHz will result in incorrect playback frequency. The author has
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a GUS PnP Pro which displays this behavior.
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.Pp
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Other members of the Interwave family have not been tested and don't
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have the glue needed to make them work. Should someone need to implement it,
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not many changes in the existing code are needed.
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Output voltage control in
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register CFIG2 [7] should be set differently for some other members of the
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family.
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.Pp
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Other architectures than i386 haven't been tested. The bus_space abstraction
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has been used from the beginning, so it should work.
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