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BigSurface

The name comes from macOS Big Sur. Big Sur + Surface -> Big Surface (LOL)

PS:If you have a better name, please let me know.

A proposition for a fully intergrated kext for all Surface Pro related hardwares

TODO

  • Surface Type Cover Done

    The code is based on VoodooI2CHID.kext, but added keyboard support.

  • Battery status--Surface Serial Hub Most Important

    See https://github.com/linux-surface/surface-aggregator-module. To obtain the battery readout, one needs to register the operation handler for _SAN device(called via _SAN.RQST) and send the request to SSH device. SSH is a UART controller, the low level uart operation(tx, rx) is needed to be completed. Thus an expert in UART development is needed. Other than that, the rest of the code is not hard to port, mainly how to encode and decode the request packages.

    The Surface Laptop and Surface Book things can be deleted.

  • Performance mode

    Depends on Surface Serial Hub driver

  • Buttons

    Surface onboard GPIO buttons. ACPI device name: MSBT HID:MSHW0040 Not finished yet.

    To drive it is quite simple, just register the corresponding GPIO interrupts and handle them.

  • Ambient Light Sensor

    ACPI device name: ACSD, attached under I2C4 The Linux source code is attached in the folder, just one source file, should be 'easy' to port.(Maybe we don't need gesture and proximity) Driver should attach to VoodooI2CDeviceNub and use it to perform I2C IO. See VoodooI2CSynaptics for code reference.

  • Cameras

    ACPI devices: CAMR,CAMF,CAM3(infrared camera) Corresponding device id: OV8865,OV5693,OV7251 Not so important, they use I2C to transfert data. Linux code available.

  • Touch Screen

    Device id: 0x34E4 Linux uses mei to communicate with the touch screen(ipts), don't know the equivalant thing on macOS nor how to communicate with it.