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NetBSD 6.1.5 - man page for hdafg (netbsd section 4)

HDAUDIO(4)			   BSD Kernel Interfaces Manual 		       HDAUDIO(4)

     hdaudio -- High Definition Audio device driver

     hdaudio* at pci? dev ? function ?
     hdafg* at hdaudiobus?
     audio* at audiobus?

     options HDAUDIO_DEBUG
     options HDAUDIO_AFG_DEBUG

     The hdaudio device driver is expected to support any PCI device which is compliant to the
     High Definition Audio Specification 1.0.  It is a replacement for azalia(4).  It was written
     from scratch following the Intel HD Audio and Microsoft Universal Audio Architecture speci-

     The driver consists of two interlinked components, which reflects the hardware design.  The
     hdaudio component interfaces with a PCI/PCIe bus and provides an hdaudiobus(4) onto which
     different function groups attach.	Each function group (e.g. audio, vendor-specific modem)
     is exported as a separate child device of the hdaudio controller.	Audio function groups
     (a.k.a. audio codec) are exported as hdafg(4) devices.

     Audio codecs are available from a number of manufacturers and are made up of a number of
     widgets (e.g. audio mixer, output pin, analog-to-digital converter).  The way the widgets
     are interlinked varies significantly between implementations.  The tree of widgets must be
     parsed and mapped to mixer(4) controls.  As part of this process, loops in the inter-codec
     links must be detected and muted, bi-directional pins must be set up appropriately and the
     locations of pins determined.  Unlike the azalia(4) driver (which tends to generate a large
     number of unclearly named mixer(4) controls), hdaudio works backwards by starting with a
     list of desired, consistent and compatible mixer(4) controls and configuring/discovering
     appropriate widget link routes to fit.

     By following the published mechanisms for common implementations of widget parsing, it is
     expected that nearly all High Definition Audio devices will be supported without requiring
     per-device quirks.

     audio(4), mixer(4), pci(4), hdaudioctl(8), http://www.intel.com/standards/hdaudio/

     The hdaudio device driver appeared in NetBSD 5.1.

     The hdaudio driver was written by Jared McNeill <jmcneill@NetBSD.org> under contract by
     Precedence Technologies Ltd <http://www.precedence.co.uk/>.  The UAA-compliant widget parser
     is derived from the FreeBSD snd_hda(4) driver.

     The following items are not yet implemented:

     o	 Improve power management support when driver is idle

     o	 Add support for non-PCM output formats

     o	 Handle unsolicited RIRB messages

     o	 Modem function groups

BSD					September 28, 2010				      BSD

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