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A User Plugs in a Device (UMDF 1)

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Warning

UMDF 2 is the latest version of UMDF and supersedes UMDF 1. All new UMDF drivers should be written using UMDF 2. No new features are being added to UMDF 1 and there is limited support for UMDF 1 on newer versions of Windows 10. Universal Windows drivers must use UMDF 2.

The archived UMDF 1 samples can be found in the Windows 11, version 22H2 - May 2022 Driver Samples Update.

For more info, see Getting Started with UMDF.

When a user plugs in a device, the framework calls a UMDF driver's PnP and Power Management callback methods in the following sequence, starting from the Device Arrived state at the bottom of the figure:

Diagram that shows the device enumeration and startup sequence for a UMDF driver.

The framework begins by calling the driver’s IDriverEntry::OnDeviceAdd callback so that the driver can create a device callback object and a framework device object to represent the device. The framework continues calling the driver’s callback routines by progressing up through the sequence until the device is operational.

The framework proceeds through this sequence for each UMDF function or filter driver that supports the device, one driver at a time, starting with the driver that is lowest in the driver stack.