While I can use
lsmod in order to show currently active kernel modules, how can I see which drivers are statically built into the kernel AND currently active?
If your linux has a /proc/config.gz
That has all the built modules. Copy it elsewhere and unzip it. Open the file everything with a "=M" is built as a module. Everything with a "=Y" is statically built.
hwinfo will list the "Driver:" check the above file to see if it is statically built.
FYI: All statically built drivers are always loaded into memory and ready for action. Without the corresponding hardware they will not do anything, but use memory.