Ce-infosys USB Devices Driver Download For Windows

Posted By admin On 21.04.21

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Describes the architecture of the USB function stack.

On a USB device, the USB function stack refers to a group of drivers that are enumerated by the Plug and Play Manager, when ACPI creates a USB device physical device object (PDO).

In a single configuration device, a USB device can define one or more interfaces. For example, the Media Transfer Protocol (MTP) for transferring files to and from the device. A composite USB device can support multiple interfaces in a single configuration. The USB function stack creates PDOs for each interface and PnP Manager loads the class driver that creates the function device object (FDO) for that interface.

The USB function stack is conceptualized in this image:

Applications and Services

All user-mode requests are sent to the Microsoft-provided kernel-mode class driver GenericUSBFn.sys. You can create a user-mode service that communicates with GenericUSBFn.sys by sending I/O control codes (IOCTLs) as defined in genericusbfnioctl.h. For more information about these IOCTLs see Communicating with GenericUSBFn.sys from a user-mode service

USB function class driver

A USB function class driver implements the functionality of a specific interface (or group of interfaces) on the USB device. MTP and IpOverUsb are examples of system-supplied class drivers. The class driver may be implemented purely as a kernel-mode driver, or it may be a user-mode service paired with the system-supplied class driver GenericUSBFn.sys.

A function class driver sends requests to the controller by using USB function class driver to UFX programming interfaces.

USB function class extension (UFX)

The USB function class extension (UFX) is a system-supplied extension to Kernel-Mode Driver Framework (KMDF). USB is a standard bus and has some required functionality and capabilities. UFX is responsible for implementing USB function logic that is common to all USB function controllers and handling and/or dispatching requests from USB function class drivers. In particular, UFX handles the process of enumerating the device and processing standard control transfers. To perform some of these operations, UFX needs to know about the capabilities of the bus. Those capabilities are reported to UFX when the class-extension interface is established.

UFX exposes standard IOCTLs that the upper layers (USB function class driver and user mode services) can use to send requests to the controller. Additionally, UFX notify upper layers about the standard requests received from the host.

USB function client driver

UFX provides an abstracted interface that works consistently across different controllers. However, controllers have different capabilities, with limitations such as the number of endpoints, the types of endpoints, low power, remote wake-up. For example, certain controllers support DMA, while others do not. Some controllers implement streams in the hardware while other controllers expect the driver to handle streams. For these reasons, only common functionality is handled in UFX. Transfers, power management, stream support, and other features which vary from controller to controller are handled by the client driver.

The USB function client driver is responsible for implementing controller-specific operations. These include implementing endpoint data transfers, USB device state changes (reset, suspend, resume), attach/detach detection, port/charger detection. The client driver is also responsible for handling power management, and PnP events.

The function client driver is written as Kernel-Mode Driver Framework (KMDF) driver by using USB function class driver to UFX programming interfaces.

Microsoft provides in-box function client drivers (UfxChipidea.sys, Ufxsynopsys.sys) for ChipIdea and Synopsys controllers.

USB lower filter driver

A USB lower filter driver supports detection of chargers if the function controller uses the in-box Synopsys and ChipIdea drivers. The filter driver manages USB charging starting from USB port detection. t must publish a GUID for each charger type it supports, and a list of that charger’s properties. If a specific charger is configurable, the lower USB filter driver defines a list of supported PropertyIDs and their corresponding value types that can be sent to it, to configure the charger. The driver also notifies the battery stack when it can begin charging and the maximum amount of current the device can draw. For client drivers other than Synopsys and ChipIdea drivers, charging logic can be implemented in the client driver.

Ce-infosys USB Devices Driver Download For Windows

A function class driver sends request to UFX by using Programming interfaces for supporting proprietary chargers.

Versions supported

Windows 10
Windows 8.1

Applies to

Device manufacturers of CDC Control devices

Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.

In Windows 10, the driver has been rewritten by using the Kernel-Mode Driver Framework that improves the overall stability of the driver.

Improved PnP and power management by the driver (such as, handling surprise removal).
Added power management features such as USB Selective Suspend.

In addition, UWP applications can now use the APIs provided by the new Windows.Devices.SerialCommunication namespace that allow apps to talk to these devices.

Usbser.sys installation

Load the Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.

Note

If you trying to install a USB device class driver included in Windows, you do not need to download the driver. They are installed automatically. If they are not installed automatically, contact the device manufacturer. For the list of USB device class driver included in Windows, see USB device class drivers included in Windows.

Windows 10

In Windows 10, a new INF, Usbser.inf, has been added to %Systemroot%Inf that loads Usbser.sys as the function device object (FDO) in the device stack. If your device belongs to the Communications and CDC Control device class, Usbser.sys is loaded automatically.You do not need to write your own INF to reference the driver. The driver is loaded based on a compatible ID match similar to other USB device class drivers included in Windows.

USBClass_02

USBClass_02&SubClass_02

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If you want to load Usbser.sys automatically, set the class code to 02 and subclass code to 02 in the Device Descriptor. For more information, see USB communications device class. With this approach, you are not required to distribute INF files for your device because the system uses Usbser.inf.
If your device specifies class code 02 but a subclass code value other than 02, Usbser.sys does not load automatically. Pnp Manager tries to find a driver. If a suitable driver is not found, the device might not have a driver loaded. In this case, you might have to load your own driver or write an INF that references another in-box driver.
If your device specifies class and subclass codes to 02, and you want to load another driver instead of Usbser.sys, you have to write an INF that specifies the hardware ID of the device and the driver to install. For examples, look through the INF files included with sample drivers and find devices similar to your device. For information about INF sections, see Overview of INF Files.

Note

Microsoft encourages you to use in-box drivers whenever possible. On mobile editions of Windows, such as Windows 10 Mobile, only drivers that are part of the operating system are loaded. Unlike desktop editions, it is not possible to load a driver through an external driver package. With the new in-box INF, Usbser.sys is automatically loaded if a USB-to-serial device is detected on the mobile device.

Windows 8.1 and earlier versions

In Windows 8.1 and earlier versions of the operating system, Usbser.sys is not automatically loaded when a USB-to-serial device is attached to a computer. To load the driver, you need to write an INF that references the modem INF (mdmcpq.inf) by using the Include directive. The directive is required for instantiating the service, copying inbox binaries, and registering a device interface GUID that applications require to find the device and talk to it. That INF specifies 'Usbser' as a lower filter driver in a device stack.

The INF also needs to specify the device setup class as Modem to use mdmcpq.inf. Under the [Version] section of the INF, specify the Modem and the device class GUID. for details, see System-Supplied Device Setup Classes.

For more information, see this KB article.

Configure selective suspend for Usbser.sys

Starting in Windows 10, Usbser.sys supports USB Selective Suspend. It allows the attached USB-to-serial device to enter a low power state when not in use, while the system remains in the S0 state. When communication with the device resumes, the device can leave the Suspend state and resume Working state. The feature is disabled by default and can be enabled and configured by setting the IdleUsbSelectiveSuspendPolicy entry under this registry key: