HUBD(7D)HUBD(7D)NAMEhubd - USB hub driver
SYNOPSIS
hub@unit-address
DESCRIPTION
The hubd is a USBA (Solaris USB Architecture) compliant client driver
that supports USB hubs conforming to the Universal Serial Bus Specifi‐
cation 2.0. 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.
FILES
/kernel/drv/hubd
32- bit x86 ELF kernel module
/kernel/drv/amd64/hubd
64- bit x86 ELF kernel module
/kernel/drv/sparcv9/hubd
64-bit SPARC ELF kernel module
ATTRIBUTES
See attributes(5) for a description of the following attributes:
┌───────────────┬───────────────────────────────┐
│ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├───────────────┼───────────────────────────────┤
│Architecture │ SPARC, x86, PCI-based systems │
└───────────────┴───────────────────────────────┘
SEE ALSOcfgadm_usb(1M), attributes(5), usba(7D)
Writing Device Drivers
Universal Serial Bus Specification 2.0
System Administration Guide: Basic Administration
http://www.sun.com/io
DIAGNOSTICS
In addition to being logged, the following messages may also appear on
the system console. Messages are formatted in the following manner:
WARNING: <device path> <hubd<instance number>): Message...
where <instance number> is the instance number of hubd and <device
path> is the physical path to the device in /devices directory. Mes‐
sages from the root hub are displayed with a usb<instance number> pre‐
fix 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 <num‐
ber> of hub. If enumeration fails, disconnect and re-connect.
Use of a USB 1.0 hub behind a high speed port may cause unexpected
failures.
Devices connected to a USB 1.0 hub which are in turn connected to
an external USB 2.0 hub, may misbehave unexpectedly or suddenly go
offline. This is due to a documented incompatibility between USB
1.0 hubs and USB 2.0 hub Transaction Translators. Please use only
USB 2.0 or USB 1.1 hubs behind high-speed ports.
Connecting a high speed device to a non-high speed hub (port x) will
result in a loss of performance. Please connect the device to a high
speed port to get the maximum performance.
USB 2.0 devices connected to USB 1.0 or 1.1 hubs cannot run at
their highest speed, even when the hub is in turn connected to a
high-speed port. For best performance, reconnect without going
through a USB 1.0 or 1.1 hub.
Cannot access <device>. Please reconnect.
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.
Port <n> overcurrent.
An overcurrent condition was detected. Please remove the device on
this port.
Devices not identical to the previous one on this port. Please discon‐
nect and reconnect.
Same condition as described above; however in this case, the driver
is unable to identify the original device with a name string.
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.
Hub global over current condition, please disconnect the devices con‐
nected to the hub to clear the condition. You may need to re-connect
the hub if the ports do not work.
An overcurrent condition was detected on the hub. This means that
the aggregate current being drawn by the devices on the downstream
ports exceeds a preset value. Refer to section 7.2.1.2 and 11.13 of
the Universal Serial Bus Specification 2.0. If this message contin‐
ues to display, you may need to remove downstream devices to elimi‐
nate the problem. If any port does not work after the overcurrent
condition is cleared, re-connect the hub to re-enable the ports.
Root hub over current condition, please check your system to clear the
condition as soon as possible. You may need to reboot the system if the
root hub does not recover automatically.
An overcurrent condition was detected on the root hub, indicating
that malfunctioning devices on the downstream ports are drawing too
much current. Please disconnect the problematic downstream devices
to eliminate the problem. If the root hub doesn't work after the
overcurrent condition is cleared, you may need to reboot the sys‐
tem.
The following messages may be logged into the system log. They are for‐
matted in the following manner:
<device path><hubd<instance number>): message...
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. Discon‐
nect the hub, plug in the external power-supply and then plug in
the hub again.
Local power has been lost, the hub could draw <x> mA power from the USB
bus.
A USB self/bus-powered hub has lost external power. Some USB
devices connected down-stream from this hub may cease to
function. Disconnect the external power-supply and then plug in the
hub again.
Two bus-powered hubs cannot be concatenated.
A bus-powered hub was connected to a bus powered hub port. Please
remove this bus-powered hub and connect it to a self-powered hub or
a root hub port.
Configuration <n> for device <device> at port <m> exceeds power avail‐
able for this port. Please re-insert your device into another hub port
which has enough power.
The device requires more power than is available on this port.
Port <n> in over current condition, please check the attached device to
clear the condition. The system will try to recover the port, but if
not successful, you need to re-connect the hub or reboot the system to
bring the port back to work.
An overcurrent condition was detected on port <n>. This means the
device connected to the port is drawing more current than the hub
can supply. If this message continues to display, please disconnect
the device to eliminate the problem. If the port doesn't work after
the overcurrent condition is cleared, please re-connect the hub or
reboot the system to enable the port again.
Jul 6, 2006 HUBD(7D)
