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

The usb_as driver processes audio data messages during play and record and sets sample frequency, precision, encoding and other functions on request from the USB audio control driver. See usb_ac(7D).

This driver is plumbed under the USB audio control driver and does not directly interface with the user application.

/kernel/drv/usb_as

32 bit ELF kernel module

/kernel/drv/sparcv9/usb_as

64 bit ELF kernel module

See attributes(5) for descriptions of the following attributes:

mixerctl(1), attributes(5), usba(7D), usb_ac(7D), audio(7I), mixer(7I), streamio(7I)

Writing Device Drivers

Universal Serial Bus Specification 1.0 and 1.1

System Administration Guide: Basic Administration

http://www.sun.com/io

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

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

where <device path> is the physical path to the device in /devices directory.

No bandwidth available.

There is no bandwidth available for the isochronous pipe. As a result, no data will be transferred during play and record.

Cannot access device. Please reconnect <name>.

There was an error in accessing the device during reconnect. Please reconnect the device.

Device is not identical to the previous one on this port. Please disconnect and reconnect.

A USB audio streaming interface was hot-removed while open. A new device was hot-inserted which is not identical to the original USB audio device. Please disconnect the USB device and reconnect the device to the same port.

The USB audio streaming interface will be power managed if device is idle.