usb_mid - USB Multi Interface Driver




The usb_mid driver is a USBA (Solaris Universal Serial Bus
Architecture)-compliant nexus driver that binds to device level nodes of
a composite (multi interface) device if no vendor or class-specific
driver is available. The usb_mid driver creates interface nodes or
interface association nodes and attempts to bind drivers to them. If no
driver is found for interface association nodes, usb_ia(4D) is bound by

UGEN (Generic USB)
The usb_mid driver also supports a ugen(4D) interface allowing raw access
to the device, for example by libusb applications, by passing the drivers
bound to each interface. Since a libusb application might change the
state of the device, you should not access the device through the child
interface drivers. Note that the usb_mid driver creates a ugen interface
only if none of its children are explicitly bound to the ugen(4D) driver.
Additionally, usb_mid does not create children.



32-bit x86 ELF kernel module


64-bit x86 ELF kernel module


64-bit SPARC ELF kernel module


ugen(4D) nodes.


See attributes(7) for descriptions of the following attributes:

|Architecture | SPARC & x86, PCI-based systems |


usb_ia(4D), usba(4D), attributes(7), cfgadm_usb(8)

Writing Device Drivers

Universal Serial Bus Specification 2.0--2000

Interface Association Descriptor Engineering Change Notice (ECN)--2003

System Administration Guide: Basic Administration


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

Warning: <device path> (usb_mid<instance number>): Error Message...

Cannot access <device>. Please reconnect.

This device 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.

Device 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.

Please disconnect and reconnect this device.

A hotplug of the device is needed before it can be restored.

The following messages may be logged into the system log. They are
formatted in the following manner:

<device path><usb_mid<instance number>): message...

No driver found for interface <n> (nodename: <string>) of <device>.

No driver is available for this interface.

No driver found for device <device>.

No driver is available for this interface.

Can't support ugen for multiple configuration devices that have attached
child interface drivers.

No ugen interface is available and libusb cannot work with this

May 13, 2017 USB_MID(4D)