USB_AC(4D) USB_AC(4D)


NAME


usb_ac - USB audio control driver

SYNOPSIS


sound-control@unit-address


DESCRIPTION


The usb_ac driver is a USBA (Solaris USB Architecture) compliant client
driver that supports the USB Audio Class 1.0 specification.


The audio control driver is a USB class driver and offers functionality
similar to the audiocs (sun4u) and audiots (Sun Blade 100) drivers which
use the Solaris audio mixer framework (mixer(4I)). Unlike the audiocs and
audiots drivers, the USB audio device can have play-only or record-only
capability.


Drivers corresponding to other USB audio interfaces on the device,
including the usb_as(4D) audio streaming driver or the hid(4D) driver,
are plumbed under the USB audio control driver and do not directly
interface with user applications.


The usb_ac driver supports USB audio class compliant devices with a
feature unit.

ERRORS


If a device is hot-removed while it is active, all subsequent opens
returns EIO. All other errors are defined in the audio(4I) man page.

FILES


/kernel/drv/usb_ac
32-bit x86 ELF kernel module


/kernel/drv/amd64/usb_ac
64-bit x86 ELF kernel module


/kernel/drv/sparcv9/usb_ac
64-bit SPARC ELF kernel module.


/kernel/drv/usb_ac.conf
USB audio driver configuration file.


ATTRIBUTES


See attributes(7) for descriptions of the following attributes:


+--------------------+-------------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-------------------------------+
|Architecture | SPARC, x86, PCI-based systems |
+--------------------+-------------------------------+
|Interface Stability | Uncommitted |
+--------------------+-------------------------------+

SEE ALSO


ioctl(2), hid(4D), usb_as(4D), usba(4D), audio(4I), mixer(4I),
streamio(4I), usb_ah(4M), attributes(7), cfgadm_usb(8)


Writing Device Drivers


Universal Serial Bus Specification 1.0 and 1.1


Universal Serial Bus Device Class Definition for Audio Devices, Release
1.0


System Administration: Basic Administration

DIAGNOSTICS


In addition to being logged, the following messages can appear on the
system console. All messages are formatted in the following manner:

Warning: <device path> (usb_ac<instance num>): Error Message...


Failure to plumb audio streams drivers.

The usb audio streaming driver or the hid driver could not be plumbed
under the audio control driver and the device is not usable.


May 13, 2009 USB_AC(4D)