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.TH USB_AC 4D "March 6, 2023"
.SH NAME
usb_ac \- USB audio control driver
.SH SYNOPSIS
.nf
sound-control@unit-address
.fi

.SH DESCRIPTION
The \fBusb_ac\fR driver is a USBA (Solaris USB Architecture) compliant client
driver that supports the \fIUSB Audio Class 1.0\fR specification.
.sp
.LP
The audio control driver is a USB class driver and offers functionality similar
to the \fBaudiots\fR driver which
uses the Solaris audio mixer framework (\fBmixer\fR(4I)). Unlike the
\fBaudiots\fR driver, the USB audio device can have
play-only or record-only capability.
.sp
.LP
Drivers corresponding to other USB audio interfaces on the device, including
the \fBusb_as\fR(4D) audio streaming driver or the \fBhid\fR(4D) driver, are
plumbed under the USB audio control driver and do not directly interface with
user applications.
.sp
.LP
The \fBusb_ac\fR driver supports USB audio class compliant devices with a
feature unit.
.SH ERRORS
If a device is hot-removed while it is active, all subsequent opens returns
EIO. All other errors are defined in the \fBaudio\fR(4I) man page.
.SH FILES
.ne 2
.na
\fB\fB/kernel/drv/usb_ac\fR\fR
.ad
.RS 30n
32-bit x86 ELF kernel module
.RE

.sp
.ne 2
.na
\fB\fB/kernel/drv/amd64/usb_ac\fR\fR
.ad
.RS 30n
64-bit x86 ELF kernel module
.RE

.sp
.ne 2
.na
\fB\fB/kernel/drv/sparcv9/usb_ac\fR\fR
.ad
.RS 30n
64-bit SPARC ELF kernel module.
.RE

.sp
.ne 2
.na
\fB\fB/kernel/drv/usb_ac.conf\fR\fR
.ad
.RS 30n
USB audio driver configuration file.
.RE

.SH ATTRIBUTES
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Architecture	SPARC, x86, PCI-based systems
_
Interface Stability	Uncommitted
.TE

.SH SEE ALSO
.BR ioctl (2),
.BR hid (4D),
.BR usb_as (4D),
.BR usba (4D),
.BR audio (4I),
.BR mixer (4I),
.BR streamio (4I),
.BR usb_ah (4M),
.BR attributes (7),
.BR cfgadm_usb (8)
.sp
.LP
\fIWriting Device Drivers\fR
.sp
.LP
\fIUniversal Serial Bus Specification 1.0 and 1.1\fR
.sp
.LP
\fIUniversal Serial Bus Device Class Definition for Audio Devices, Release
1.0\fR
.sp
.LP
\fISystem Administration: Basic Administration\fR
.SH DIAGNOSTICS
In addition to being logged, the following messages can appear on the system
console. All messages are formatted in the following manner:
.sp
.in +2
.nf
Warning: <device path> (usb_ac<instance num>): Error Message...
.fi
.in -2
.sp

.sp
.ne 2
.na
\fBFailure to plumb audio streams drivers.\fR
.ad
.sp .6
.RS 4n
The \fBusb\fR audio streaming driver or the \fBhid\fR driver could not be
plumbed under the audio control driver and the device is not usable.
.RE