Support for HID Sensor framework. This creates a MFD instance
for a sensor hub and identifies all the sensors connected to it.
Each sensor is registered as a MFD cell, so that sensor specific
processing can be done in a separate driver. Each sensor
drivers can use the service provided by this driver to register
for events and handle data streams. Each sensor driver can format
data and present to user mode using input or IIO interface.

source code:

drivers/hid/hid-sensor-hub.c