USB_AC(4D) Devices 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
audiots driver which uses the Solaris
audio mixer framework (
mixer(4I)). Unlike the
audiots driver, 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 AdministrationDIAGNOSTICS
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.
March 6, 2023 USB_AC(4D)
