Hardware Random Number Generator Core infrastructure.

To compile this driver as a module, choose M here: the
module will be called rng-core. This provides a device
that's usually called /dev/hwrng, and which exposes one
of possibly several hardware random number generators.

These hardware random number generators do feed into the
kernel's random number generator entropy pool.

If unsure, say Y.

source code:

drivers/char/hw_random/