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.\"	$OpenBSD: azalia.4,v 1.27 2012/03/15 14:22:59 sthen Exp $
.\"	$NetBSD: azalia.4,v 1.2 2005/06/22 04:19:09 kent Exp $
.\"
.\" Copyright (c) 2005 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by TAMURA Kent
.\"
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.Dd $Mdocdate: March 15 2012 $
.Dt AZALIA 4
.Os
.Sh NAME
.Nm azalia
.Nd generic High Definition Audio device
.Sh SYNOPSIS
.Cd "azalia* at pci?"
.Cd "audio* at azalia?"
.Sh DESCRIPTION
The
.Nm
device driver is expected to support any PCI device which is
compliant with the High Definition Audio Specification 1.0.
.Pp
Supported controllers include:
.Pp
.Bl -bullet -compact -offset indent
.It
Acer Labs M5461
.It
AMD Hudson-2
.It
ATI SB450, SB600, SB700, SB800
.It
Intel 82801FB/GB/H/I/JI (ICH6, ICH7, ICH8, ICH9, ICH10)
.It
NVIDIA MCP51/MCP55/MCP61/MCP65/MCP67/MCP73/MCP77/MCP79/MCP89
.It
Silicon Integrated System 966/966L
.It
VIA Technologies VT8237A, VT8251
.El
.Pp
The High Definition Audio (HDA) specification describes a flexible and
extensible infrastructure to support high quality audio.
HDA supports sample rates up to 192 kHz, bit rates of up to 32 bits per
sample, and up to 16 channels in audio streams.
It also supports S/PDIF input/output as well as jack retasking and sensing.
The HDA specification defines a controller register set and a codec
architecture.
.Sh MIXER INTERFACE
The codec is the main audio processor.
Configuration of the device, such as selecting playback sample rate
or decreasing the volume, is handled by the codec.
Codecs are comprised of interconnected widgets.
Common examples of widgets include DACs (digital to analog converter),
ADCs (analog to digital converter), selectors, mixers, and pin
complexes (input/output jacks).
Widgets may have fixed or controllable properties.
Some of these properties include source selection, amplifier gain,
mute, and operational direction.
.Pp
The mixer interface for
.Nm
is designed to allow the user to control most properties of the widgets.
When
.Nm
first attaches and configures the device, it will set all widgets to
unmuted, moderate volume, and configure connections such that stereo
playback and recording will work with the expected input/output pins.
.Pp
There are a wide range of HDA codecs.
Some have only a few widgets that don't have many controllable
properties, and some may have many, very controllable widgets.
The mixer interface on one
.Nm
may be very different than the mixer interface on another.
.Pp
Mixer item names describe the widget and property being controlled.
Names take the following form:
.Bd -literal
<mixer class>.<widget type>[<widget type enumerator>][_<property>]
.Ed
.Pp
The mixer class gives a hint as to the purpose of the control.
The widget type enumerator is used to distinguish different widgets
of the same type.
The enumeration starts at 2: the first widget of each type is not
enumerated.
The enumeration order is meaningless.
The property is optional.
Generally, if there is no property, the mixer item is an amplifier gain
control.
.Pp
The following are the widget type names used in mixer control names:
.Bl -tag -width "SPDIF-in"
.It Cm dac
Digital to analog converter, usually used for playback.
The audio stream channels these widgets will convert are encoded into
their name in the form of <start channel>:<end channel>.
For example,
.Cm dac-0:1
converts channels 0 and 1 (stereo).
However, a dac that is connected to built-in speakers or front
panel headphone jacks by default will convert audio stream channels
starting at 0 if the dac would otherwise not be converting any channels.
For example, if
.Cm dac-2:3
is the default dac for the built-in speakers in a laptop,
.Cm dac-2:3
will convert channels 0 and 1 when a stereo audio stream is being played.
This is to allow simultaneous stereo playback on both the built-in speakers
and a line or headphone jack.
.It Cm dig-dac
Digital output converter, usually an S/PDIF transmitter.
The audio stream channels these widgets will convert are encoded into
their name in the form of <start channel>:<end channel>.
For example,
.Cm dig-dac-0:1
converts channels 0 and 1 (stereo).
.It Cm adc
Analog to digital converter, usually used for recording.
The audio stream channels these widgets will convert are encoded into
their name in the form of <start channel>:<end channel>.
For example,
.Cm adc-0:1
converts channels 0 and 1 (stereo).
.It Cm dig-adc
Digital input converter, usually an S/PDIF receiver.
The audio stream channels these widgets will convert are encoded into
their name in the form of <start channel>:<end channel>.
For example,
.Cm dig-adc-0:1
converts channels 0 and 1 (stereo).
.It Cm mix
Sums multiple audio sources into a single stream, but
sometimes only used for amplifier or mute properties.
The property part of a mix widget mixer control name may be
the name of another widget.
Such a mixer item controls the input level from the widget in the
property part of the name.
.It Cm sel
Selects a single audio source, but sometimes used only for amplifier
or mute properties.
.It Cm pow
Controls power state for a group of widgets.
.It Cm volume
Interprets data from external controls, such as a volume knob.
.It Cm beep
Creates a tone at a certain frequency.
.It Cm line
Pin complex for a line-level jack that is normally used for analog audio
output.
The name may also be appended with a color abbreviation such as -grn (green),
-blk (black), -org (orange), or -gry (grey), to help differentiate jacks.
.It Cm spkr
Pin complex for a speaker, often built into the machine.
.It Cm hp
Pin complex for a jack that is normally used for output to a headphone.
.It Cm cd
Pin complex for analog audio input from a CD device.
.It Cm SPDIF
Pin complex for an S/PDIF output connector.
.It Cm line-in
Pin complex for a line-level jack that is normally used for analog audio input.
.It Cm aux
Pin complex for an auxiliary analog audio input.
.It Cm mic
Pin complex for analog audio input from a microphone, either a jack or built
into the machine.
.It Cm SPDIF-in
Pin complex for an S/PDIF input connector.
.It Cm beep
Pin complex for analog audio input from a beep generator.
.El
.Pp
The following are the property names used in mixer control names:
.Bl -tag -width "source"
.It Cm mute
Mutes input or output audio stream.
.It Cm source
Selects input source.
Can either select a single source or multiple sources.
Sometimes these controls may only have a single choice, but they are
provided to show how audio streams move through the codec.
.It Cm dir
Selects pin direction and input VRef signal.
VRef is represented in percent of the analog voltage rail.
For example, 'input-vr80' means input direction with 80% VRef.
.It Cm boost
Enables/disables low impedance amplifier, usually for use with headphones.
.It Cm eapd
Powers on/off external amplifier circuitry.
.It Cm sense
Reports current jack sense state.
.El
.Pp
There are also some special mixer controls that don't directly
correspond to properties of the widgets, but control aspects
of the driver or other mixer controls.
The following describes these special controls:
.Bl -tag -width "outputsXmasterXslaves"
.It Cm outputs.spkr_muters
List of pins that can mute a built-in speaker.
A pin mutes the speaker by sending a signal when it senses that something
has been plugged into its jack.
If a pin supports both input and output operation, the pin will only mute
the speaker when plugged into if that pin is configured for output.
.It Cm outputs.master.slaves
List of widgets with amplifier gain or mute controls that are configured
with the parameters used for
.Cm outputs.master
and
.Cm outputs.master.mute .
For example, if
.Cm dac
is in the list and has an input amplifier gain control, setting
.Cm outputs.master
to 200 will set
.Cm inputs.dac
to 200.
.It Cm outputs.master
Amplifier gain control for widgets listed in
.Cm outputs.master.slaves .
.It Cm outputs.master.mute
Mute control for widgets listed in
.Cm outputs.master.slaves .
.It Cm record.volume.slaves
List of widgets with amplifier gain or mute controls that are configured
with the parameters used for
.Cm record.volume
and
.Cm record.volume.mute .
For example, if
.Cm adc
is in the list and has an input amplifier gain control, setting
.Cm record.volume
to 200 will set
.Cm record.adc
to 200.
.It Cm record.volume
Amplifier gain control for widgets listed in
.Cm record.volume.slaves .
.It Cm record.volume.mute
Mute control for widgets listed in
.Cm record.volume.slaves .
.It Cm outputs.mode
Controls whether the digital or analog converters and pins will be
used for playback.
.It Cm record.mode
Controls whether the digital or analog converters and pins will be
used for recording.
.El
.Sh SEE ALSO
.Xr audio 4 ,
.Xr pci 4
.Sh HISTORY
The
.Nm
device driver first appeared in
.Nx 3.0 .
.Ox
support first appeared in
.Ox 4.0 .
.Sh BUGS
This driver does not support codecs that are intended for HDMI or
DisplayPort connectivity.