Check for the presence of i2c-SYN in dmesg. In properties, verify General - location is on I2C HID Device and Details - Hardware Ids contains VID_06CB (or SYN, SYNA). Check for HID-compliant touch pad in device manager. Parent device of VoodooI2CHIDDevice has name containing SYN or SYNA. VoodooI2CHIDDevice has HIDDescriptor containing VendorID 0圆cb, or. If you already have VoodooI2CHID installed, check folllowing values in IORegistry. Likely compatible if you run dmesg and find a message along the lines of "Your touchpad x says it can support a different bus." and it's a Synaptics trackpad. There have been one or two examples of the trackpad not showing up but still being compatible. If the trackpad does not show up, there is a chance that it will still work. It will usually appear as UU in my experiance if it's a Synaptics device. Synaptic devices are always at address 0x2c, so check at that address for anything other than. 
Run i2cdetect # where # is the number you got from running the prior command. Run i2cdetect -l, and note the number for SMBus (It's usually zero). Get i2c-tools from your package manager.psmouse.intertouch=1) for your synaptics trackpad, then it's compatible
Check under Device Manager for a Synaptics SMBus device. Look for "VoodooPS2Trackpad: Trackpad supports SMBus operation" within macOS logs (may need to use sudo dmesg to see this). Look in IORegistryExplorer under ApplePS2SynapticsTrackpad, and look for the value Intertouch Support=True. 
MacOS (Requires Acidanthera's VoodooPS2 version 2.2.0 or above): Pay close attention to which bus it works over. Synaptic trackpads generally work over SMBus or I2C, though not both. Force Touch emulation for clickpads (press down clickpad and increase finger pressure).When following the instructions below, make sure you only select I2C or SMBus depending on your trackpad's capabilities. This works for both I2C HID trackpads from Synaptic as well as Synaptic's SMBus trackpads.
#IC2 HID DEVICE WON'T START DRIVER#
A port for macOS of Synaptic's RMI Trackpad driver from Linux.
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