If you are actually looking for the driver in the context of Synaptics security:
If the driver is missing, outdated, or corrupted, Windows cannot "talk" to the chip. Hence, the fingerprint reader vanishes, and Windows Security reports "TPM not detected." synaptics tmp 2970 driver
Kernel developers discovered that the firmware on these touchpads was "broken by design" regarding how it reported its capabilities. A developer named Wolfram Sang and others had to write a specific patch for the Linux Kernel (specifically for the Synaptics RMI4 bus). If you are actually looking for the driver
Some PCs use a firmware TPM (fTPM) built into the CPU. The Synaptics TMP 2970 is a (dTPM). Discrete chips are more secure against voltage attacks but more prone to driver issues. If your dTPM fails, you cannot simply "switch to fTPM" in BIOS without reinstalling Windows. Some PCs use a firmware TPM (fTPM) built into the CPU
sudo modprobe tpm_tis_spi dmesg | grep -i tpm