nixos-config/modules/hardware/surface-pro6.nix

{ config, lib, pkgs, ... }:

let
  fetchurl = pkgs.fetchurl;
  commit = "821d8f0685ebad0fa2c05c7080f45eafb28ad08c";
  kernelVersion = "5.14";
  mkPatch = name: sha256: {
    name = name;
    patch = fetchurl {
      inherit sha256;

      url = "https://raw.githubusercontent.com/linux-surface/linux-surface/${commit}/patches/${kernelVersion}/${name}.patch";
    };
  };
  cfg = config.ptw.hardware.surface;
in {
  options.ptw.hardware.surface = {
    enable = lib.mkEnableOption "Enable support for the Microsoft Surface Pro 6";
  };

  config = lib.mkIf cfg.enable {
    environment.etc = {
      "ipts.conf".text = ''
      [Config]
      BlockOnPalm = true
    '';
      "thermald/thermal-cpu-cdev-order.xml".source = fetchurl {
        url = "https://raw.githubusercontent.com/linux-surface/linux-surface/${commit}/contrib/thermald/surface_pro_5/thermal-conf.xml.auto.mobile";
        sha256 = "1wsrgad6k4haw4m0jjcjxhmj4742kcb3q8rmfpclbw0czm8384al";
      };
    };

    powerManagement = {
      enable = true;
      cpuFreqGovernor = "powersave";
    };
    hardware.video.hidpi.enable = true;
    
    systemd.services.iptsd = {
      description = "Userspace daemon for Intel Precise Touch & Stylus";
      wantedBy = [ "multi-user.target" ];
      wants = [ "dev-ipts-15.device" ];
      after = [ "dev-ipts-15.device" ];
      serviceConfig = {
        Type = "simple";
        ExecStart = "${pkgs.iptsd}/bin/iptsd";
      };
    };
    environment.systemPackages = with pkgs; [ iptsd surface-control ];
    services = {
      udev.packages = with pkgs; [ iptsd surface-control ];
      thermald = {
        enable = true;
        configFile = fetchurl {
          url = "https://raw.githubusercontent.com/linux-surface/linux-surface/${commit}/contrib/thermald/thermal-conf.xml";
          sha256 = "1xj70n9agy41906jgm4yjmsx58i7pzsizpvv3rkzq78k95qjfmc9";
        };
      };
    };

    boot = {
      kernelPackages = pkgs.linuxPackages_5_14;
      kernelPatches = [
        (mkPatch "0001-surface3-oemb" "0ji3glnbaiy10kzi2zi80278vyf0pp23s7dqx8pwirbqxi6pygnp")
        (mkPatch "0002-mwifiex" "0d7jpfiyb74i5fm2gdhwa5bi9kd7ff4mb75yss0lvidga10r9hmp")
        (mkPatch "0003-ath10k" "0a6iwdw5wkjd24bnz32msncr1am2db36x6qpf652rx12czia8ndj")
        (mkPatch "0004-ipts" "0ib7bnh4xanz5cakr50nirshhzn3rb29x9kq4m0snp38fhyaa8dv")
        (mkPatch "0005-surface-sam" "19yjxgznhv65g1v6dcv6fklahi2inmf7gllbzmh6k98r3531kzjg")
        (mkPatch "0006-surface-sam-over-hid" "0np7zf8328yxy9xzbipqjw014kzy0kmm67c046fmgmvniibixvs7")
        (mkPatch "0007-surface-gpe" "164hhw0jh800qxmwiahw4hdsprghm760i8c6pwq89mh440wkfxnk")
        (mkPatch "0008-surface-button" "0w03azjlhwdz9isjc5swlpimj48zx7jgjws6ws8xxlb37vbg4lq6")
        (mkPatch "0009-surface-typecover" "0s2i13x780zmwbksv4rk1lryrv6n6mvc49ljn3zdy4d9yy10x272")
        (mkPatch "0010-cameras" "0vwz609vbrracc8qm1jzm471ls4imqlilf3hh2whsb2w2npmd0kf")
        (mkPatch "0011-amd-gpio" "09xjc0fl9vccz1nks6v62359digrk92svr75qz9zcvfmpyxg18z7") # TODO: Maybe drop

        {
          name = "surface-config";
          patch = null;
          # Options from https://github.com/linux-surface/linux-surface/blob/master/configs/surface-5.13.config
          extraConfig = ''
        #
        # Surface Aggregator Module
        #
        SURFACE_AGGREGATOR m
        SURFACE_AGGREGATOR_ERROR_INJECTION n
        SURFACE_AGGREGATOR_BUS y
        SURFACE_AGGREGATOR_CDEV m
        SURFACE_AGGREGATOR_REGISTRY m

        SURFACE_ACPI_NOTIFY m
        SURFACE_DTX m
        SURFACE_PLATFORM_PROFILE m

        SURFACE_HID m
        SURFACE_KBD m

        BATTERY_SURFACE m
        CHARGER_SURFACE m

        #
        # Surface Hotplug
        #
        SURFACE_HOTPLUG m

        #
        # IPTS touchscreen
        #
        # This only enables the user interface for IPTS data.
        # For the touchscreen to work, you need to install iptsd.
        #
        MISC_IPTS m

        #
        # Cameras: IPU3
        #
        #VIDEO_IPU3_IMGU m
        VIDEO_IPU3_CIO2 m
        CIO2_BRIDGE y
        #INTEL_SKL_INT3472 m

        #
        # Cameras: Sensor drivers
        #
        #VIDEO_OV5693 m
        VIDEO_OV8865 m

        #
        # ALS Sensor for Surface Book 3, Surface Laptop 3, Surface Pro 7
        #
        APDS9960 m

        #
        # Other Drivers
        #
        INPUT_SOC_BUTTON_ARRAY m
        SURFACE_3_BUTTON m
        SURFACE_3_POWER_OPREGION m
        SURFACE_PRO3_BUTTON m
        SURFACE_GPE m
        SURFACE_BOOK1_DGPU_SWITCH m

        #
        # Other
        #
        # Prevent a non-fatal "kernel oops" at boot crashing udev
        # (https://github.com/linux-surface/linux-surface/issues/61#issuecomment-579298172)
        PINCTRL_INTEL y
        PINCTRL_SUNRISEPOINT y
        # Required for reading battery data
        # (https://github.com/linux-surface/surface-aggregator-module/wiki/Testing-and-Installing)
        SERIAL_DEV_BUS y
        SERIAL_DEV_CTRL_TTYPORT y
        MFD_INTEL_LPSS_PCI y
        INTEL_IDMA64 y
      '';
        }
      ];
    };
  };
}