224 lines
5.6 KiB
Groff
224 lines
5.6 KiB
Groff
.\" Copyright (c) 2006 Joel Dahl <joel@FreeBSD.org>
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 16, 2007
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.Dt SND_HDA 4
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.Os
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.Sh NAME
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.Nm snd_hda
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.Nd "Intel High Definition Audio bridge device driver"
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.Sh SYNOPSIS
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To compile this driver into the kernel, place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device sound"
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.Cd "device snd_hda"
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.Ed
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.Pp
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Alternatively, to load the driver as a module at boot time, place the
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following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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snd_hda_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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bridge device driver allows the generic audio driver,
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.Xr sound 4 ,
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to attach to Intel High Definition Audio devices.
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The
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.Nm
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driver supports hardware that conforms with revision 1.0 of the Intel High
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Definition Audio specification and tries to behave much like the Microsoft
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Universal Audio Architecture (UAA) draft (revision 0.7b) for handling audio
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devices.
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HDA acts like a primary bus, similar to
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.Xr miibus 4 ,
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for handling various child buses such as audio, modem and HDMI (High Definition
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Multimedia Interface).
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Only audio is implemented in the
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.Nm
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driver.
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.Pp
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The High Definition (HD) Audio specification was developed by Intel as the
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logical successor of the old AC'97 specification and has several advantages,
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such as higher bandwidth which allows more channels and more detailed formats,
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support for several logical audio devices, and general purpose DMA channels.
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.Pp
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The HDA specification defines the register-level interface, physical link
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characteristics, codec programming models, and codec architectural components.
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This specification is intended for both device driver developers and hardware
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component designers.
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.Ss Boot-time Configuration
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The following variables are available at boot-time through the
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.Xr device.hints 5
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file:
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.Bl -tag -width ".Va hint.pcm.%d.config" -offset indent
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.It Va hint.pcm.%d.config
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Configures a range of possible options.
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Possible values are:
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.Dq Li gpio0 ,
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.Dq Li gpio1 ,
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.Dq Li gpio2 ,
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.Dq Li gpioflush ,
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.Dq Li eapdinv ,
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.Dq Li fixedrate ,
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.Dq Li forcestereo ,
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.Dq Li softpcmvol ,
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and
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.Dq Li vref .
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An option prefixed with
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.Dq Li no ,
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such as
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.Dq Li nofixedrate ,
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will do the opposite and takes precedence.
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Options can be separated by whitespace and commas.
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.El
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.Ss Runtime Configuration
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The following
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.Xr sysctl 8
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variables are available in addition to those available to all
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.Xr sound 4
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devices:
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.Bl -tag -width ".Va dev.pcm.%d.polling" -offset indent
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.It Va dev.pcm.%d.polling
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Experimental polling mode, where the driver operates by querying the device
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state on each tick using
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.Xr callout 9 .
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Polling is disabled by default.
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Do not enable it unless you are facing weird interrupt problems or if the
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device cannot generate interrupts at all.
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.El
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.Sh HARDWARE
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The
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.Nm
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driver supports the following audio chipsets:
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.Pp
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.Bl -bullet -compact
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.It
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ATI SB450
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.It
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ATI SB600
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.It
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Intel 631x/632xESB
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.It
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Intel 82801F
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.It
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Intel 82801G
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.It
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Intel 82801H
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.It
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nVidia MCP51
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.It
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nVidia MCP55
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.It
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nVidia MCP61A
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.It
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nVidia MCP61B
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.It
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nVidia MCP65A
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.It
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nVidia MCP65B
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.It
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SiS 966
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.It
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VIA VT8251/8237A
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.El
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.Pp
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Generic audio chipsets compatible with the Intel HDA specification should work,
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but have not been verified yet.
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The following codecs have been verified to work:
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.Pp
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.Bl -bullet -compact
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.It
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Analog Device AD1981HD
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.It
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Analog Device AD1983
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.It
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Analog Device AD1986A
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.It
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CMedia CMI9880
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.It
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Conexant Venice
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.It
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Conexant Waikiki
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.It
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Realtek ALC260
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.It
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Realtek ALC861
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.It
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Realtek ALC880
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.It
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Realtek ALC882
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.It
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Realtek ALC883
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.It
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Realtek ALC888
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.It
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Sigmatel STAC9220
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.It
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Sigmatel STAC9220D/9223D
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.It
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Sigmatel STAC9221
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.It
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Sigmatel STAC9221D
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.It
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Sigmatel STAC9227
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.It
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Sigmatel STAC9271D
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.El
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.Sh SEE ALSO
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.Xr sound 4 ,
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.Xr device.hints 5 ,
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.Xr loader.conf 5 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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device driver first appeared in
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.Fx 7.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Stephane E. Potvin Aq sepotvin@videotron.ca
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and
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.An Ariff Abdullah Aq ariff@FreeBSD.org .
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This manual page was written by
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.An Joel Dahl Aq joel@FreeBSD.org .
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.Sh BUGS
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There are a couple of missing features, such as support for Digital
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S/PDIF and multichannel output.
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.Pp
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A few Hardware/OEM vendors tend to screw up BIOS settings, thus
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rendering the
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.Nm
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driver useless, which usually results in a state where the
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.Nm
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driver seems to attach and work, but without any sound.
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