Very simple, work in progress polled input driver for the SPI keyboard / trackpad found on 12" MacBooks.
To get this driver to work on a 2016 12" MacBook, you'll need to boot the kernel with intremap=nosid. Also, you'll need to modify your DSDT as described by Leif Liddy at https://bugzilla.kernel.org/attachment.cgi?id=206671. (but don't worry about applying patches. Also see https://wiki.archlinux.org/index.php/DSDT for a quicker way to load custom DSDTs without recompiling)
This should result in the intel-lpss driver attaching itself to the SPI controller, and exposing the APP000D device.
The 2015 MacBook seems much more complicated, as the DMA controller isn't built in to the SPI controller. Unfortunately, I don't have a 2015 model to test.
- Basic Typing
- Driver unloading (no more hanging)
- Basic touchpad functionality (even right click, handled by libinput)
- MT touchpad functionality (two finger scroll, probably others)
- Key rollover (properly)
- FN keys (simple enough)
- Interrupts
- Suspend / resume probably
Currently, how interrupts work are unknown; so this driver will constantly poll the device every few ms. This works, but results in a pretty big battery drain.
The touchpad protocol is the same as the bcm5974 driver. Perhaps there is a nice way of utilizing it? For now, bits of code have just been copy and pasted.