From afde0286728e1933ead350d7aabc72668db0194c Mon Sep 17 00:00:00 2001
From: rnhmjoj <rnhmjoj@inventati.org>
Date: Fri, 5 Feb 2021 08:52:51 +0100
Subject: [PATCH] nixos/i2c: add module to set up i2c permissions

This is a very simple module that installs a single udev rule.
The rule set the ownership of all /dev/i2c-* devices to a
group, "i2c" by default but can be changed. The "uaccess" tag
also makes systemd add an ACL for users with a seat[1].

Fix issue #91771

[1]: https://enotty.pipebreaker.pl/2012/05/23/linux-automatic-user-acl-management/
---
 nixos/modules/hardware/i2c.nix | 43 ++++++++++++++++++++++++++++++++++
 nixos/modules/module-list.nix  |  1 +
 2 files changed, 44 insertions(+)
 create mode 100644 nixos/modules/hardware/i2c.nix

diff --git a/nixos/modules/hardware/i2c.nix b/nixos/modules/hardware/i2c.nix
new file mode 100644
index 000000000000..ff14b4b1c891
--- /dev/null
+++ b/nixos/modules/hardware/i2c.nix
@@ -0,0 +1,43 @@
+{ config, lib, ... }:
+
+with lib;
+
+let
+  cfg = config.hardware.i2c;
+in
+
+{
+  options.hardware.i2c = {
+    enable = mkEnableOption ''
+      i2c devices support. By default access is granted to users in the "i2c"
+      group (will be created if non-existent) and any user with a seat, meaning
+      logged on the computer locally.
+    '';
+
+    group = mkOption {
+      type = types.str;
+      default = "i2c";
+      description = ''
+        Grant access to i2c devices (/dev/i2c-*) to users in this group.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+
+    boot.kernelModules = [ "i2c-dev" ];
+
+    users.groups = mkIf (cfg.group == "i2c") {
+      i2c = { };
+    };
+
+    services.udev.extraRules = ''
+      # allow group ${cfg.group} and users with a seat use of i2c devices
+      ACTION=="add", KERNEL=="i2c-[0-9]*", TAG+="uaccess", GROUP="${cfg.group}", MODE="660"
+    '';
+
+  };
+
+  meta.maintainers = [ maintainers.rnhmjoj ];
+
+}
diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index 0d26b7300d05..3d9b73a81509 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -46,6 +46,7 @@
   ./hardware/cpu/intel-microcode.nix
   ./hardware/digitalbitbox.nix
   ./hardware/device-tree.nix
+  ./hardware/i2c.nix
   ./hardware/sensor/hddtemp.nix
   ./hardware/sensor/iio.nix
   ./hardware/keyboard/zsa.nix