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usb_ac - USB audio control driver

sound-control@unit-address

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.

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. /kernel/drv/usb_ac /kernel/drv/amd64/usb_ac /kernel/drv/sparcv9/usb_ac /kernel/drv/usb_ac.conf See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Architecture SPARC, x86, PCI-based systems

Interface Stability Uncommitted

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

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.