USB Device vendors use co-installers to update device firmware for devices that use inbox USB device drivers. However, co-installers are not supported by the new "Universal INF" standard, which is a requirement on Windows 10. This poses a challenge to existing USB device firmware update process. This topic outlines a recommended method to update USB device firmware without a co-installer.
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The recommended method to circumvent the absence of a co-installer for the USB device firmware update scenario is to use a lower filter driver to the USB device that will kick start the firmware update process. During the AddDevice call, the filter driver will check the device firmware version and update the firmware if necessary.
When a USB device is plugged in to the system, the generic inbox driver is installed for the device. After the installation of the generic driver, the OS queries the Windows Update server for any vendor specific driver package availability and downloads it and installs the driver. The installed driver package will perform the firmware update.
While installing the driver update package, the firmware update WDF filter driver's AddDevice routine will be called. From this routine, the WDF filter driver will get for the device firmware version from the device HW registry key. The device firmware should have placed the firmware version using the MSOS descriptor onto the device HW registry key.
When the EVT_WDF_DEVICE_D0_ENTRY callback of the WDF filter driver is called at a later point, the filter driver must register for device interface change notifications using CM_Register_Notification or IoRegisterPlugPlayNotification (UMDF or KMDF) to listen to the device interface class the USB device will register the device into. E.g. The firmware update filter driver for a RGB camera would register for KSCATEGORY_VIDEO_CAMERA. On receiving the notification, the filter driver should post a work-item that would perform the firmware update.
UMDF based firmware update drivers can use the device specific APIs or issue the control transfers directly to access the USB device to perform the firmware update. For example, the UMDF based filter driver for a camera would use Camera APIs to perform the firmware update.
The method of using a "firmware update filter driver", is recommended for devices that have enough resources to hold two full firmware images (the update image and a backup image) on the device memory. The reason is if there were failures during downloading the updated firmware, the device can abandon the update and boot into its original firmware. Thus, not bricking the device.
In this method, a lower filter driver to the USB device will be installed as part of the driver update process. This filter driver will send a command to the device to restart in firmware update mode, where the device exposes a firmware update interface. The driver for the firmware update interface will load and perform the firmware update.
While installing the driver update package, the WDF lower filter driver's AddDevice routine will be called. From this routine, the filter driver will query for the device firmware version from the device HW registry key. The device firmware should have placed the "firmware version", using the MSOS descriptor or the USB device's extension INF, onto the device HW registry key.
When the EVT_WDF_DEVICE_D0_ENTRY callback of the WDF filter driver is called at a later point, the filter driver will issue a vendor specific command to the device which will place it in firmware update mode. i.e. The device will disconnect and reconnect, exposing the firmware update interface.
The system will enumerate the firmware update device interface. A custom firmware update WDF driver supplied by the vendor, in the firmware update package, will be load for this firmware update interface. This driver will update the firmware.
The firmware update process can fail for various reasons. If that happens, when the device is enumerated again, the firmware update driver may try to update the firmware again and may fail again and this update process could end up in a loop. The firmware update driver must put an upper limit to the number of retries it can perform. When the firmware update retries gets beyond a threshold (for example, 3 retries) then the filter driver should not attempt to update the firmware again, until a new version of the driver is downloaded from WU. The firmware update driver may use the registry to persist the retry states.
Bluetooth Device Driver errors are common problem users of Bluetooth face from time to time. The drivers are operating systems used in Windows and different Windows such as Windows 10, 8, and 7 use different drivers. What this means is that if you have an incompatible driver on your device you may not be able to send and receive data with ease. This article treats how to fix Bluetooth Adapter driver issues.
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