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 audiocs (sun4u) and audiots (Sun Blade 100) drivers which use the Solaris audio mixer framework (mixer(4I)). Unlike the audiocs and audiots drivers, 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.
See attributes(7) for descriptions of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE|
|Architecture||SPARC, x86, PCI-based systems|
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.
|May 13, 2009||OmniOS|