Devices                                                usb_as(7D)

NAME
     usb_as - USB audio streaming driver

SYNOPSIS
     usb_as@unit-address

DESCRIPTION
     The usb_as driver is a USBA (Solaris USB Architecture)  com-
     pliant  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.

FILES
     /kernel/drv/usb_as
           32 bit ELF kernel module

     /kernel/drv/sparcv9/usb_as
           64 bit ELF kernel module

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

     ____________________________________________________________
   |        ATTRIBUTE TYPE       |        ATTRIBUTE VALUE      |
   | ____________________________|_____________________________|_
   |  Architecture               |  Limited to PCI-based system|
   | ____________________________|_____________________________|_
   |  Availability               |  SUNWuaud, SUNWuaudx        |
   |_____________________________|_____________________________|
   | Stability level             | Evolving                    |
   |_____________________________|_____________________________|

SEE ALSO
     mixerctl(1),  sdtaudiocontrol(1),  ioctl(2),  attributes(5),
     ohci(7D),   uhci(7D),   usba(7D),  usb_ac(7D),  usb_mid(7D),
     audio(7I), mixer(7I), streamio(7I)

     Writing Device Drivers

     Universal Serial Bus Specification 1.0 and 1.1

     Universal Serial Bus Device Class Definition for Audio  Dev-
     ices, Release 1.0

SunOS 5.9           Last change: 22 May 2001                    1

Devices                                                usb_as(7D)

DIAGNOSTICS
     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 direc tory.

     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   recon-
     nect. 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.

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

     If the USB Audio Streaming driver instance is busy, a system
     suspend will fail.

SunOS 5.9           Last change: 22 May 2001                    2