CFGADM_USB(8) Maintenance Commands and Procedures CFGADM_USB(8)

NAME

cfgadm_usb - USB hardware-specific commands for cfgadm

SYNOPSIS

/usr/sbin/cfgadm [-f] [-y | -n] [-v] -c function ap_id...


/usr/sbin/cfgadm -f [-y | -n] [-v] [-o hardware_options]
-x hardware_function ap_id...


/usr/sbin/cfgadm -v [-a] [-s listing_option]
[-l [ap_id | ap_type...]]


/usr/sbin/cfgadm -v -h [ap_id]...

DESCRIPTION

The Universal Serial Bus (USB) hardware-specific library
/usr/lib/cfgadm/usb.so.1 provides the functionality for administering
USB devices via the cfgadm(8) command. cfgadm operates on attachment
points. For details regarding attachment points, refer to cfgadm(8).


For USB administration, the only attachment points supported are the
ports of hubs attached to the USB bus.


Attachment points are named through attachment point IDs (ap_ids).
The USB bus is hierarchical, so the ap_ids are as well. USB hubs have
ports, numbered from 1 to n. All USB ap_ids consist of a string of
the following form:

usbN/A[.B[.C[...]]]


where
N is the Nth USB host controller on the system,
A is port #A on the root (top) hub.
B is port #B of the hub plugged into port #A of the hub above it.
C is port #C of the hub plugged into port #B of the hub above it,
and so forth.


For example, the first port on the root hub of USB controller 0 (the
only controller), has a logical ap_id:

usb0/1


Similarly, the second port on the first external hub plugged into the
first port on the root hub of the first USB controller has a logical
ap_id:

usb0/1.2


For example, if the ap_id is usb0/1.4.3.4, it represents port 4 of
the hub plugged into port 3 of the hub plugged into port 4 of the hub
plugged into port 1 of the root hub of the first USB host controller
on the system.

example# cfgadm -l
Ap_Id Type Receptacle Occupant Condition
usb0/1 USB-hub connected configured ok
usb0/2 unknown empty unconfigured ok
usb0/1.1 USB-storage connected configured ok
usb0/1.2 unknown empty unconfigured ok
usb0/1.3 unknown empty unconfigured ok
usb0/1.4 USB-device connected configured ok


USB 2.0 chips have one EHCI host USB 2.0 host controller and a number
of companion USB 1.x host controllers (either OHCI or UHCI host
controllers).


When a USB 2.0 device has been plugged in, it shows up on the EHCI
logical ports which might not have a 1 to 1 mapping to external
physical port numbers on the system. When a USB 1.x device is
plugged in, the EHCI host controller reroutes the device to a
companion host controller and the device shows up on the companion's
logical port number.


The mapping of logical port numbers to physical port numbers can get
quite complicated. For example:

% cfgadm
Ap_Id Type Receptacle Occupant Condition
c0 scsi-bus connected configured unknown
usb0/1 usb-mouse connected configured ok
usb0/2 usb-kbd connected configured ok
usb0/3 unknown empty unconfigured ok
usb0/4 usb-hub connected configured ok
usb0/4.1 unknown empty unconfigured ok
usb0/4.2 unknown empty unconfigured ok
usb0/4.3 unknown empty unconfigured ok
usb0/4.4 usb-storage connected configured ok
usb1/1 unknown empty unconfigured ok
usb1/2 unknown empty unconfigured ok
usb1/3 unknown empty unconfigured ok
usb2/1 unknown empty unconfigured ok
usb2/2 usb-device connected configured ok
usb3/1 unknown empty unconfigured ok
usb3/2 unknown empty unconfigured ok
usb3/3 unknown empty unconfigured ok
usb3/4 unknown empty unconfigured ok
usb3/5 unknown empty unconfigured ok


In this example usb0 is the onboard USB 1.x host controller. usb1
and usb2 are companion OHCI USB 1.x host controllers and usb3 is an
EHCI USB 2.0 host controller.


The following table shows the somewhat confusing routing for this USB
2.0 chip:

logical port number physical port number
------------------- --------------------
usb1/1 internal port 1
usb1/2 external port 1
usb1/3 external port 3

usb2/1 internal port 2
usb2/2 external port 2

usb3/1 internal port 1
usb3/2 internal port 2
usb3/3 external port 1
usb3/4 external port 2
usb3/5 external port 3


Unfortunately, the exact routing can often only be determined by
experimentation.


The receptacle states for attachment points at the USB port have the
following meanings:

connected

USB port is powered on and enabled. A USB device is plugged in to
the port. The device is logically connected to the USB bus.


disconnected

USB port is powered on and enabled. A USB device is plugged into
the port. The device has been logically disconnected from the USB
bus (using the cfgadm -c disconnect command).


empty

USB port is powered on, but no device is plugged in to it.


The occupant states for devices at USB port attachment points at the
USB port have the following meanings:

configured

The USB device at the USB port is configured and usable.


unconfigured

The USB device at the USB port was explicitly off-lined using
cfgadm -c unconfigure, or was not successfully configured for
use, for example, having no driver or a device problem.


The attachment point conditions are:

ok

Normal state - ready for use.


failing

Not used.


failed

Not used.


unusable

The user has physically removed a device while an application had
the device open (there might be outstanding I/O). Users need to
reinsert the same physical device and close the application
properly before removing the device again. The port cannot
configure other inserted devices until this is done.

If the original device cannot be reinserted into the port, see
the for instructions for clearing this attachment point
condition.


unknown

Not used.


A USB device can be hotplugged or hotunplugged at any time, and the
system detects the event and takes the appropriate action.


It is not necessary to transition a receptacle to the disconnected
state before removing its device from the USB. However, it is not
recommended to hot-remove devices currently in use (such as removable
disks currently opened by a volume manager or some other
application).

OPTIONS

cfgadm defines several types of operations. These operations include
invoking configuration state changes (-c), invoking hardware-specific
functions (-x), and obtaining configuration administration help
messages (-h).


If any of these operations fail, the device and attachment point
might not be in the expected state. Use the cfgadm -l command to
display the device's current status.


All other options have the same meaning as defined in cfgadm(8).


The following options are supported:

-c function

The following generic commands are defined for the USB hardware
specific library. The following configuration state change
operations are supported:

configure

If there is a USB device plugged into the port, this command
attempts to configure it and set everything up so that it is
usable. This command does an implied connect (reverse of
disconnect) if necessary. This command accomplishes nothing,
and returns an error message, if the device at that port is
already configured. After successful execution of this
command, the device is ready for use.


disconnect

Performs an unconfigure on the ap_id (if it is not already
unconfigured), and then transitions the receptacle to the
disconnected state, even though a device is still be plugged
into the port. Issuing a cfgadm -c configure, or physically
hotplugging the device, brings the device back to the
connected receptacle state, and to the configured occupant
state, assuming a driver can be found and there are no
problems enumerating and configuring the device.


unconfigure

Makes the device plugged into the port unusable (offline it).
If successful, cfgadm reports this ap_id's occupant state as
unconfigured. Issuing a configure to the ap_id (if
successful) brings its occupant back to the configured
(online) condition, as it physically hotplugging the device
on the port.


-f

Not supported.


-h ap_id

USB specific help can be obtained by using the help option with
any USB attachment point.


-l[v]

The -l option works as described in cfgadm(8). When paired with
the -v option, the Information field contains the following
USB-specific information:

o Mfg: manufacturer string (iManufacturer)

o Product: product string (iProduct)

o Serial: serial number (iSerialNumber)

o NConfigs: total number of configurations the device
supports (bNumConfigurations).

o Config: current configuration setting in decimal
(configuration index, not configuration value).

o The configuration string descriptor for the current
configuration (iConfiguration)
See the Universal Serial Bus specification for a description of
these fields.


-o hardware_options

Hardware options are only supported for the hardware-specific
command, -x usb_config. See the description of that command below
for an explanation of the options available.


-s listing_options

Attachment points of class USB can be listed by using the select
sub-option. See cfgadm(8).


-x hardware_function

The following hardware-specific functions are defined:

usb_config -o config=n

This command requires the mandatory config value to be
specified using the -o option.

Sets the USB configuration of a multi-configuration USB
device at ap_id to configuration index n. The device is set
to this configuration henceforth and this setting persists
across reboots, hot-removes, and unconfigure/configure of the
device.

Valid values of n range from 0 to (Nconfigs -1). The device
is reset by a disconnect followed by a configure. The
configure causes the device to be configured to the new
configuration setting.

If any of these steps fail, the configuration file and the
device are restored to their previous state and an error
message is issued.


usb_reset

Performs a software reset (re-enumeration) of the device.
This is the equivalent of removing the device and inserting
it back again. The port on the hub is power cycled if the hub
supports power cycling of individual ports.

If the connected device is a hub, this function has the
effect of resetting that hub and any devices down the tree of
which it is the root.

If any of these steps fail, the device is restored to its
previous state and an error message is issued.


State table: attachment points state versus commands:

Valid states:
empty/unconfigured -> no device connected

disconnected/unconfigured -> logically disconnected,
unavailable,
devinfo node removed,
device physically connected

connected/unconfigured -> logically connected,
unavailable,
devinfo node present

connected/configured -> connected, available


The table below clarifies the state transitions resulting from
actions or commands:

current state operation new state
------------- --------- ---------
empty/
unconfigured:
device plugged in: connected/configured or
connected/unconfigured
(if enumeration failed)
device removed: n/a
cfgadm -c unconfigure: empty/unconfigured
cfgadm -c configure: empty/unconfigured
cfgadm -c disconnect: empty/unconfigured
(no-op and error)

disconnected/
unconfigured:
device plugged in: n/a
device removed: empty/unconfigured
cfgadm -c unconfigure: disconnected/unconfigured
cfgadm -c configure: connected/configured, or
connected/unconfigured
(if reenumeration failed)
cfgadm -c disconnect: disconnected/unconfigured

connected/unconfigured:
device plugged in: n/a
device removed: empty/unconfigured
cfgadm -c unconfigure: connected/unconfigured
cfgadm -c configure: connected/configured, or
connected/unconfigured
(if reenumeration failed)
cfgadm -c disconnect: disconnected/unconfigured

connected/configured:
device plugged in: n/a
device removed: empty/unconfigured or
connected/configured,
but with ap condition
'unusable' if device
was open when removed
cfgadm -c unconfigure: connected/unconfigured
cfgadm -c configure: connected/configured
cfgadm -c disconnect: disconnected/unconfigured

EXAMPLES

Example 1: Listing the Status of All USB Devices

The following command lists the status of all USB devices on the
system:


# cfgadm
Ap_Id Type Receptacle Occupant Condition
usb0/1 USB-hub connected configured ok
usb0/2 unknown empty unconfigured ok
usb0/1.1 USB-storage connected configured ok
usb0/1.2 unknown empty unconfigured ok
usb0/1.3 unknown empty unconfigured ok
usb0/1.4 USB-device connected configured ok


Notice that cfgadm treats the USB-device device at ap_id usb0/1.4 as
a single unit, since it cannot currently control individual
interfaces.

Example 2: Listing the Status of a Port with No Device Plugged In

The following command lists the status of a port with no device
plugged in:


example# cfgadm -l usb0/1.3
Ap_Id Type Receptacle Occupant Condition
usb0/1.3 unknown empty unconfigured ok

Example 3: Listing the Status of the Same Port with a Device Plugged

In


The following command lists the status of the same port after
physically plugging in a device that configures without problems:


example# cfgadm -l usb0/1.3
Ap_Id Type Receptacle Occupant Condition
usb0/1.3 USB-hub connected configured ok

Example 4: Unconfiguring an Existing USB Device

The following command unconfigures the USB device attached to
usb0/1.3, then displays the status of the ap_id:


example# cfgadm -c unconfigure usb0/1.3
Unconfigure the device: /devices/pci@0,0/pci8086,7112@7,2/hub@2:2.3
This operation suspends activity on the USB device
Continue (yes/no)?

Enter:

y

example# cfgadm -l usb0/1.3
Ap_Id Type Receptacle Occupant Condition
usb0/1.3 unknown connected unconfigured ok

Example 5: Unconfiguring and Logically Disconnecting an Existing USB

Device


The following command unconfigures and logically disconnects a USB
device attached to usb0/1.3:


example# cfgadm -c disconnect usb0/1.3
Disconnect the device: /devices/pci@0,0/pci8086,7112@7,2/hub@2:2.3
This operation suspends activity on the USB device
Continue (yes/no)?

Enter:

y

example# cfgadm -l usb0/1.3
Ap_Id Type Receptacle Occupant Condition
usb0/1.3 unknown disconnected unconfigured ok


A disconnect implies that cfgadm does an unconfigure first. The
receptacle status now shows disconnected, even though the device is
still physically connected. In this case, a physical hotplug or using
the cfgadm -c configure on the ap_id brings it back on-line.

Example 6: Configuring a Previously Unconfigured USB Device

The following command configures a USB device that was previously
attached to usb0/1.3:


example # cfgadm -yc configure usb0/1.3
example# cfgadm -l usb0/1.3
Ap_Id Type Receptacle Occupant Condition
usb0/1.3 unknown connected configured ok

Example 7: Resetting a USB Device

The following command resets a USB device:


example# cfgadm -x usb_reset usb0/1.3
Reset the device: /devices/pci@0,0/pci8086,7112@7,2/hub@2:2.3
This operation suspends activity on the USB device
Continue (yes/no)?

Enter:

y

Example 8: Displaying Detailed Information About a USB Device

The following command displays detailed information about a USB
device. This device shows the following USB-specific information in
the 'Information' field:


o Manufacturer string: STMicroelectronics

o Product string: STLINK-V3

o Serial number: 003C00174741500520383733

o Number of configurations supported: 1

o Configuration currently active: 0

o Configuration string descriptor for configuration 0:
Default

example# cfgadm -lv usb2/1.2
Ap_Id Receptacle Occupant Condition Information
When Type Busy Phys_Id
usb2/1.2 connected configured ok Mfg: STMicroelectronics
Product: STLINK-V3 Serial: 003C00174741500520383733 NConfigs: 1 Config:
0 : Default Config


example# cfgadm -l -s "cols=ap_id:info" usb2/1.2
Ap_Id Information
usb2/1.2 Mfg: STMicroelectronics Product: STLINK-V3
Serial: 003C00174741500520383733 NConfigs: 1 Config: 0 : Default Config

Example 9: Displaying Detailed Information About All USB Devices

The following command displays detailed information about all USB
devices on the system:


example# cfgadm -l -s "select=class(usb),cols=ap_id:info"
Ap_Id Information
usb1/3 Mfg: VIA Labs, Inc. Product: USB2.0 Hub
Serial: <undef> NConfigs: 1 Config: 0 <no cfg str descr>
usb1/3.1 Mfg: STMicroelectronics Product: STM32 STLink
Serial: 0668FF515754888367141334 NConfigs: 1 Config: 0 <no cfg str descr>
usb1/3.2
usb1/3.3 Mfg: STMicroelectronics Product: STLINK-V3
Serial: 003700303137511139383538 NConfigs: 1 Config: 0 : Default Config
usb1/3.4 Mfg: FTDI Product: FT4232H MiniModule
Serial: FT51SZA7 NConfigs: 1 Config: 0 <no cfg str descr>
usb1/4
usb1/5
usb1/6
usb1/7 Mfg: VIA Labs, Inc. Product: USB3.0 Hub
Serial: <undef> NConfigs: 1 Config: 0 <no cfg str descr>
usb1/7.1
usb1/7.2
usb1/7.3
usb1/7.4
usb1/8
usb2/1 Mfg: <undef> Product: <undef> Serial: <undef>
NConfigs: 1 Config: 0 <no cfg str descr>
usb2/1.1 Mfg: ARM Product: DAPLink CMSIS-DAP
Serial: 02360b000d96e4fc00000000000000000000000097969905 NConfigs: 1
Config: 0 <no cfg str descr>
usb2/1.2 Mfg: STMicroelectronics Product: STLINK-V3
Serial: 003C00174741500520383733 NConfigs: 1 Config: 0 : Default Config


Lines containing only an ap_id are empty ports. These can be filtered
out. This example only lists USB ap_ids with connected devices, and
information about those devices.


example# cfgadm -l -s "select=class(usb),cols=ap_id:info" | grep Mfg
usb1/3 Mfg: VIA Labs, Inc. Product: USB2.0 Hub
Serial: <undef> NConfigs: 1 Config: 0 <no cfg str descr>
usb1/3.1 Mfg: STMicroelectronics Product: STM32 STLink
Serial: 0668FF515754888367141334 NConfigs: 1 Config: 0 <no cfg str descr>
usb1/3.3 Mfg: STMicroelectronics Product: STLINK-V3
Serial: 003700303137511139383538 NConfigs: 1 Config: 0 : Default Config
usb1/3.4 Mfg: FTDI Product: FT4232H MiniModule
Serial: FT51SZA7 NConfigs: 1 Config: 0 <no cfg str descr>

Example 10: Listing Information About a Multi-configuration USB Device

The following example lists information about a multi-configuration
USB device.


Notice the NConfigs field: the configurations available for this
device are 0, 1, and 2 (0 to (NConfigs-1)).


example# cfgadm -l -s "cols=ap_id:info" usb1/3.3
Ap_Id Information
usb1/3.3 Mfg: STMicroelectronics Product: STLINK-V3
Serial: 003700303137511139383538 NConfigs: 1 Config: 0 : Default Config

Example 11: Setting the Current Configuration of a Multi-configuration

USB Device


The following example sets the current configuration of a multi-
configuration USB device:


example# cfgadm -o config=2 -x usb_config usb0/1.4
Setting the device: /devices/pci@1f,2000/usb@1/device@3
to USB configuration 2
This operation suspends activity on the USB device
Continue (yes/no)?

Enter:

y

USB configuration changed successfully.


The device path should be checked to ensure that the right instance
of a device is being referred to, in the case where multiple devices
of the exact same type are on the same bus. This information is
available in the 'Information' field.

FILES

/usr/lib/cfgadm/usb.so.1

Hardware specific library for generic USB device administration

SEE ALSO

config_admin(3CFGADM), scsa2usb(4D), usba(4D), attributes(7),
cfgadm(8)


Universal Serial Bus 1.1 Specification (www.usb.org)

NOTES

cfgadm(8) can not unconfigure, disconnect, reset, or change the
configuration of any USB device currently opened by any application.
These operations also fail on a hub if a device in its hierarchy is
opened by an application. See scsa2usb(4D) for unconfiguring a USB
mass-storage device that is currently in use.


Only super-users can execute any functions on an attachment point.
However, one need not be a super-user to list the attachment points.

August 2, 2023 CFGADM_USB(8)