Operating systems differ in how they link a device to its driver.
In Windows, the link is performed by the INF file, which registers the device to work with the driver. This association is performed before the DriverEntry routine is called. The operating system recognizes the device, looks up in its database which INF file is associated with the device, and according to the INF file, calls the driver's entry point.

In Linux, the link between a device and its driver is defined in the init_module routine. The init_module routine includes a callback which states what hardware the driver is designated to handle. The operating system calls the driver's entry point, based on the definition in the code.