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framework: refactor kmod for improved AMD support
Changes several aspects of framework-laptop-kmod support: - default value has been changed to true when NixOS >= 24.05 and linux kernel >=6.10, and false otherwise - adds required patch for framework AMD enablement when kernel <6.10 - add README section describing usage
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2 changed files with 45 additions and 9 deletions
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@ -51,6 +51,17 @@ For the Framework 13 laptops, there are common configuration modules available u
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including some modules specific to AMD- or Intel-based laptops. By preference, there will already be a specialised
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module for your model's configuration. Otherwise, it can be added alongside the existing modules.
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## OS integration
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`hardware.framework.enableKmod` enables the [community-created Framework kernel
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module](https://github.com/DHowett/framework-laptop-kmod) which exposes EC functionality like battery charge limit,
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privacy switches, and system LEDs as standard driver interfaces. This enables, for example, configuring the charge limit
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using the KDE settings GUI. The option is enabled by default when NixOS `>= 24.05` and linux kernel version `>= 6.10`.
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On AMD Framework 13 and 16, before kernel 6.10, additional kernel patches are required for the kernel module to function
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properly. Manually setting `hardware.framework.enableKmod = true` will apply the patches, requiring a kernel
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recompilation.
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## Support Tools
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### fw-ectool
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@ -1,17 +1,42 @@
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{ config, lib, ... }:
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{
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options.hardware.framework.enableKmod = lib.mkEnableOption
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{ config, lib, pkgs, ... }:
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let
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kernel_version_compatible = lib.versionAtLeast config.boot.kernelPackages.kernel.version "6.10";
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in {
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options.hardware.framework.enableKmod = (lib.mkEnableOption
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"Enable the community created Framework kernel module that allows interacting with the embedded controller from sysfs."
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// {
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# Enable by default if on new enough version of NixOS
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default = (lib.versionAtLeast (lib.versions.majorMinor lib.version) "24.05");
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) // {
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# enable by default on NixOS >= 24.05 and kernel >= 6.10
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default = lib.and
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(lib.versionAtLeast (lib.versions.majorMinor lib.version) "24.05")
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kernel_version_compatible;
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};
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config = lib.mkIf config.hardware.framework.enableKmod {
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boot.extraModulePackages = with config.boot.kernelPackages; [
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config.boot = lib.mkIf config.hardware.framework.enableKmod {
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extraModulePackages = with config.boot.kernelPackages; [
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framework-laptop-kmod
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];
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# https://github.com/DHowett/framework-laptop-kmod?tab=readme-ov-file#usage
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boot.kernelModules = [ "cros_ec" "cros_ec_lpcs" ];
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kernelModules = [ "cros_ec" "cros_ec_lpcs" ];
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# add required patch if enabled on kernel <6.10
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kernelPatches = lib.mkIf (!kernel_version_compatible) [
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rec {
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name = "platform/chrome: cros_ec_lpc: add support for AMD Framework Laptops";
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msgid = "20240403004713.130365-1-dustin@howett.net";
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version = "3";
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hash = "sha256-aQSyys8CMzlj9EdNhg8vtp76fg1qEwUVeJL0E+8w5HU=";
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patch = pkgs.runCommandLocal "patch-${msgid}" {
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nativeBuildInputs = with pkgs; [ b4 git cacert ];
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SSL_CERT_FILE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
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outputHash = hash;
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} ''
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export HOME="$TMP"
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PYTHONHASHSEED=0 ${pkgs.b4}/bin/b4 -n am -C -T -v ${version} -o- "${msgid}" > "$out"
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'';
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}
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];
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};
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}
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