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framework: refactor kmod for improved AMD support

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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
This commit is contained in:
xenia 2024-07-04 03:01:44 -04:00
parent fe01780d35
commit 4c0d42b582
2 changed files with 45 additions and 9 deletions
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11
framework/README.md
View file

@ -51,6 +51,17 @@ For the Framework 13 laptops, there are common configuration modules available u
including some modules specific to AMD- or Intel-based laptops. By preference, there will already be a specialised
module for your model's configuration. Otherwise, it can be added alongside the existing modules.
## OS integration
`hardware.framework.enableKmod` enables the [community-created Framework kernel
module](https://github.com/DHowett/framework-laptop-kmod) which exposes EC functionality like battery charge limit,
privacy switches, and system LEDs as standard driver interfaces. This enables, for example, configuring the charge limit
using the KDE settings GUI. The option is enabled by default when NixOS `>= 24.05` and linux kernel version `>= 6.10`.
On AMD Framework 13 and 16, before kernel 6.10, additional kernel patches are required for the kernel module to function
properly. Manually setting `hardware.framework.enableKmod = true` will apply the patches, requiring a kernel
recompilation.
## Support Tools
### fw-ectool

43
framework/kmod.nix
View file

@ -1,17 +1,42 @@
{ config, lib, ... }:
{
options.hardware.framework.enableKmod = lib.mkEnableOption
{ config, lib, pkgs, ... }:
let
kernel_version_compatible = lib.versionAtLeast config.boot.kernelPackages.kernel.version "6.10";
in {
options.hardware.framework.enableKmod = (lib.mkEnableOption
"Enable the community created Framework kernel module that allows interacting with the embedded controller from sysfs."
// {
# Enable by default if on new enough version of NixOS
default = (lib.versionAtLeast (lib.versions.majorMinor lib.version) "24.05");
) // {
# enable by default on NixOS >= 24.05 and kernel >= 6.10
default = lib.and
(lib.versionAtLeast (lib.versions.majorMinor lib.version) "24.05")
kernel_version_compatible;
};
config = lib.mkIf config.hardware.framework.enableKmod {
boot.extraModulePackages = with config.boot.kernelPackages; [
config.boot = lib.mkIf config.hardware.framework.enableKmod {
extraModulePackages = with config.boot.kernelPackages; [
framework-laptop-kmod
];
# https://github.com/DHowett/framework-laptop-kmod?tab=readme-ov-file#usage
boot.kernelModules = [ "cros_ec" "cros_ec_lpcs" ];
kernelModules = [ "cros_ec" "cros_ec_lpcs" ];
# add required patch if enabled on kernel <6.10
kernelPatches = lib.mkIf (!kernel_version_compatible) [
rec {
name = "platform/chrome: cros_ec_lpc: add support for AMD Framework Laptops";
msgid = "20240403004713.130365-1-dustin@howett.net";
version = "3";
hash = "sha256-aQSyys8CMzlj9EdNhg8vtp76fg1qEwUVeJL0E+8w5HU=";
patch = pkgs.runCommandLocal "patch-${msgid}" {
nativeBuildInputs = with pkgs; [ b4 git cacert ];
SSL_CERT_FILE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
outputHash = hash;
} ''
export HOME="$TMP"
PYTHONHASHSEED=0 ${pkgs.b4}/bin/b4 -n am -C -T -v ${version} -o- "${msgid}" > "$out"
'';
}
];
};
}