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 hubd - USB hub driver





The hubd is a USBA (Solaris USB Architecture) compliant client driver that supports USB hubs conforming to the Universal Serial Bus Specification 1.0 and 1.1. The hubd driver supports bus-powered and self-powered hubs. The driver supports hubs with individual port power, ganged power and no power switching.

When a device is attached to a hub port, the hubd driver enumerates the device by determining its type and assigning an address to it. For multi-configuration devices, hubd sets the preferred configuration (refer to cfgadm_usb(1M) to select a configuration). The hubd driver attaches a driver to the device if one is available for the default or selected configuration. When the device is disconnected from the hub port, the hubd driver offlines any driver instance attached to the device.


32 bit ELF kernel module
64 bit ELF kernel module



See attributes(5) for a description of the following attributes:

ArchitecturePCI-based systems
Availability SUNWusb, SUNWusbx



cfgadm_usb(1M), attributes(5), usba(7D)

Writing Device Drivers

Universal Serial Bus Specification 1.0 and 1.1

System Administration Guide: Basic Administration



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

WARNING: <device path> <usb<instance number>>: Error message...

where <instance number> is the instance number of hubd and <device path> is the physical path to the device in /devices directory. Messages from the root hub are displayed with a usb<instance number> prefix instead of hub<instance number> as the root hub is an integrated part of the host controller.

Connecting device on port <number> failed.
The driver failed to enumerate the device connected on port <number> of hub. If enumeration fails, disconnect and re-connect.
Global over current condition. Please disconnect.
The driver detected an over current condition. This means that the aggregate current being drawn by the devices on the downstream port exceeds a preset value. Refer to section and 11.13.5 of the Universal Serial Bus Specification 1.1. You must remove and insert this hub to render it and its downstream devices functional again. If this message continues to display for a particular hub, you may need to remove downstream devices to eliminate the problem.
Cannot access device. Please reconnect <device name>.
This hub has been disconnected because a device other than the original one has been inserted. The driver informs you of this fact by displaying the name of the original device.
Devices not identical to the previous one on this port. Please disconnect and reconnect.
Same condition as described above; however in this case, the driver is unable to identify the original device with a name string.
Local power has been lost, please disconnect hub.
A USB self-powered hub has lost external power. All USB devices connected down-stream from this hub will cease to function. Disconnect the hub, plug in the external power-supply and then plug in the hub again.
Hub driver supports max of <n> ports on hub. Hence, using the first <number of physical ports> of <n> ports available.
The current hub driver supports hubs that have <n> ports or less. A hub with more than <n> ports has been plugged in. Only the first <n> out of the total <number of physical ports> ports are usable.

SunOS 5.9Go To TopLast Changed 12 Dec 2001

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.