This article describes best practices about implementing the remote wake-up capability in a client driver. The article applies to composite drivers that replace Usbccgp.sys. In this article, you'll learn about implementing those features in a driver that controls a composite device.
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This article provides an overview of function suspend and function remote wake-up features for Universal Serial Bus (USB) 3.0 multi-function devices (composite devices).
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How to implement function suspend for a composite driver The procedure in this article applies to a custom Windows Driver Model (WDM)-based composite driver that replaces Usbccgp.sys. The Microsoft-provided driver, Usbccgp.sys, is the default composite driver that Windows loads. This article describes how a driver of a USB multi-function device, called a composite driver, can register and unregister the composite device with the underlying USB driver stack. This section provides information about choosing the correct mechanism for the selective suspend feature. Here's content for driver developers about how to implement selective suspend in USB drivers that are based on the Windows® Driver Foundation (WDF). This article describes the WDM device states to use for USB device power states as specified in section 9.1 of the Universal Serial Bus 2.0 specification.Ī USB function driver supports runtime idle detection by implementing USB selective suspend.
For information about managing power in KMDF-based client drivers, see Supporting PnP and power management in your driver for UMDF-based client drivers, see PnP and power management in UMDF-based drivers. USB client drivers based on kernel-mode driver framework (KMDF) and user-mode driver framework (UMDF) should use the mechanisms supported by the base technology and respective frameworks for managing power for a USB device. It's important to understand how these features interact with the Windows Driver Model (WDM), and in particular how Microsoft Windows has adapted standard USB features to support the system wake-up architecture.įor information about WDM power management in kernel-mode drivers, see Implementing power management. All of a sudden my Nuance Powermic II is no longer being detected as a Powermic when plugged in to the USB port. Power management abilities of USB devices that comply with the Universal Serial Bus (USB) specification have a rich and complex set of power management features. If you are using PowerScribe 360 Reporting and you are running a secondary application that uses the microphone, you may experience an issue where PowerScribe 360 Reporting does not receive the PowerMic button events (button pushes) when another application gains focus and the focus switching feature is enabled on the PowerMic driver. The articles in this section examine the ways in which the WDM power model interacts with the power management properties of USB devices.
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