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https://github.com/cb22/macbook12-spi-driver
WIP input driver for the SPI touchpad / keyboard found in the 12" MacBook (MacBook8,1 + MacBook9,1)
https://github.com/cb22/macbook12-spi-driver
Last synced: 12 days ago
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WIP input driver for the SPI touchpad / keyboard found in the 12" MacBook (MacBook8,1 + MacBook9,1)
- Host: GitHub
- URL: https://github.com/cb22/macbook12-spi-driver
- Owner: cb22
- License: gpl-2.0
- Created: 2016-07-30T10:00:19.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2021-04-24T14:05:55.000Z (over 3 years ago)
- Last Synced: 2024-06-01T14:34:22.621Z (5 months ago)
- Language: C
- Homepage:
- Size: 165 KB
- Stars: 295
- Watchers: 42
- Forks: 102
- Open Issues: 27
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
Very simple, work in progress input driver for the SPI keyboard / trackpad found on 12" MacBooks (2015 and later) and newer MacBook Pros (late 2016 and later).
Using it:
---------
If you're on any MacBook or MacBook Pro other than MacBook8,1 (2015), and you're running a kernel before 4.11, then you'll need to boot the kernel with `intremap=nosid`. In all cases make sure you don't have `noapic` in your kernel options.
On the 2015 MacBook you need to (re)compile your kernel with `CONFIG_X86_INTEL_LPSS=n` if running a kernel before 4.14. And on all kernels you need ensure the `spi_pxa2xx_platform` and `spi_pxa2xx_pci` modules are loaded too (if you don't have those module, rebuild your kernel with `CONFIG_SPI_PXA2XX=m` and `CONFIG_SPI_PXA2XX_PCI=m`).
On all other MacBook's and MacBook Pros you need to instead make sure both the `spi_pxa2xx_platform` and `intel_lpss_pci` modules are loaded (if these don't exist, you need to (re)compile your kernel with `CONFIG_SPI_PXA2XX=m` and `CONFIG_MFD_INTEL_LPSS_PCI=m`).
For best results everywhere, make sure all three modules (this `applespi` driver plus the two core ones mentioned above) are present in your initramfs/initrd so that the keyboard is functional by the time the prompt for the disk password appears. Also, having them loaded early also appears to remove the need for the `irqpoll` kernel parameter on MacBook8,1's.
DKMS module (Debian & co):
--------------------------
As root, do the following (all MacBook's and MacBook Pro's except MacBook8,1 (2015)):
```
echo -e "\n# applespi\napplespi\nspi_pxa2xx_platform\nintel_lpss_pci" >> /etc/initramfs-tools/modules
apt install dkms
git clone https://github.com/cb22/macbook12-spi-driver.git /usr/src/applespi-0.1
dkms install -m applespi -v 0.1
```
If you're on a MacBook8,1 (2015):
```
echo -e "\n# applespi\napplespi\nspi_pxa2xx_platform\nspi_pxa2xx_pci" >> /etc/initramfs-tools/modules
apt install dkms
git clone https://github.com/cb22/macbook12-spi-driver.git /usr/src/applespi-0.1
dkms install -m applespi -v 0.1
```
What works:
-----------
* Basic Typing
* FN keys
* Driver unloading (no more hanging)
* Basic touchpad functionality (even right click, handled by libinput)
* MT touchpad functionality (two finger scroll, probably others)
* Interrupts!
* Suspend / resume
What doesn't work:
------------------
* Key rollover (properly)
* Wakeup on keypress / touchpad
Known bugs:
-----------
* Occasionally, the SPI device can get itself into a state where it causes an interrupt storm. There should be a way of resetting it, or better yet avoiding this state altogether.
Interrupts:
-----------
Interrupts are now working! This means that the driver is no longer polled, and should no longer be a massive battery drain. For more information on how the driver receives interrupts, see the discussion [here](https://github.com/cb22/macbook12-spi-driver/pull/1)
Touchpad:
---------
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.
Debugging:
----------
The `debug` module parameter can be used to turn debugging output on (and off) dynamically, and can be set in all the usual ways (e.g. via kernel command-line (`applespi.debug=0x1`), via sysfs (`echo 0x10000 | sudo tee /sys/module/applespi/parameters/debug`), etc.).
Some useful values are (since the value is a bitmask, these can be combined):
* 0x10000 - determine touchpad values range
* 0x1 - turn on logging of touchpad initialization packets
* 0x6 - turn on logging of backlight and caps-lock-led packets
Some useful threads:
--------------------
* https://bugzilla.kernel.org/show_bug.cgi?id=108331
* https://bugzilla.kernel.org/show_bug.cgi?id=99891