If you are doing a fresh install of Windows 10 on a Lenovo X240 with the 1920x1080 touch display, then you should find that the majority of the drivers for it will be identified, but you will most likely find that there is one annoying device that is left behind and it should have a hardware ID of ACPI\VEN_BCM&DEV_2F09, with it also being located on the "Synaptics SMBus Driver". When doing a search for this identifier, the only place that had a proper reference for it was the Driveridentifier website, but of course the download link is a loaded one that passes information onto them.
Since it took me a while to finally find the right driver for this device and it looked as if there were not any other references for it in the Google search, I decided to include a clean version of the link to the correct driver. This is the genuine driver and it shows up with Lenovo as the Signed vendor when it is installed, with the unknown device also being converted to the correct one which is a "NFC SMBus Device", that is powered by a Broadcom driver. Below is the link to the driver.

https://download.lenovo.com/consumer/desktop/h1101280.exe