pyrox.dev
1{
2 config,
3 lib,
4 pkgs,
5 ...
6}:
7let
8 cfg = config.hardware.i2c;
9in
10
11{
12 options.hardware.i2c = {
13 enable = lib.mkEnableOption ''
14 i2c devices support. By default access is granted to users in the "i2c"
15 group (will be created if non-existent) and any user with a seat, meaning
16 logged on the computer locally
17 '';
18
19 group = lib.mkOption {
20 type = lib.types.str;
21 default = "i2c";
22 description = ''
23 Grant access to i2c devices (/dev/i2c-*) to users in this group.
24 '';
25 };
26 };
27
28 config = lib.mkIf cfg.enable {
29
30 boot.kernelModules = [ "i2c-dev" ];
31
32 users.groups = lib.mkIf (cfg.group == "i2c") {
33 i2c = { };
34 };
35
36 services.udev.packages = lib.singleton (
37 pkgs.writeTextFile {
38 name = "i2c-udev-rules";
39 text = ''
40 # allow group ${cfg.group} and users with a seat use of i2c devices
41 ACTION=="add", KERNEL=="i2c-[0-9]*", TAG+="uaccess", GROUP="${cfg.group}", MODE="660"
42 '';
43 destination = "/etc/udev/rules.d/70-i2c.rules";
44 }
45 );
46
47 };
48
49 meta.maintainers = [ lib.maintainers.rnhmjoj ];
50
51}