Devices                                                usbas(7D)



NAME
     usbas - USB audio streaming driver

SYNOPSIS
     sound@unit-address


DESCRIPTION
     The usbas driver is a USBA (Solaris USB Architecture)  com-
     pliant  client  driver that supports the USB Audio Class 1.0
     specification.


     The usbas 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 usbac(7D).


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

FILES
     /kernel/drv/usbas            32-bit x86 ELF kernel module


     /kernel/drv/amd64/usbas      64-bit x86 ELF kernel module


     /kernel/drv/sparcv9/usbas    64-bit SPARC ELF kernel module


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




















SunOS 5.11           Last change: 9 Oct 2004                    1






Devices                                                usbas(7D)



     
           ATRIBUTE TYPE                ATRIBUTE VALUE       
    
     Architecture                 SPARC, x86, PCI-based systems
    
     Availability                 SUNWusb                      
    
     Stability level              Evolving                     
    


SEE ALSO
     mixerctl(1), attributes(5), usba(7D), usbac(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

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

       Warning:  (usbas): Error Message...




     where  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.


     Operating a full/high speed audio device on a high speed
     port is not supported.

         The USB software does not currently support full or high
         speed audio devices connected to an external USB 2.0 hub



SunOS 5.11           Last change: 9 Oct 2004                    2






Devices                                                usbas(7D)



         that is linked to a port of a USB 2.0  host  controller.
         Audio  devices must be connected directly to a port of a
         USB 2.0 controller or to any USB 1.1 port.


     Cannot access device. Please reconnect .

         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 identi-
         cal 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
     the device is idle.































SunOS 5.11           Last change: 9 Oct 2004                    3