From 97900e1e7eb3257a037ce5cfc3544787295685d9 Mon Sep 17 00:00:00 2001
From: mexisme <wildjim+dev@kiwinet.org>
Date: Mon, 5 Dec 2022 13:26:28 +1300
Subject: [PATCH] Support reloading i2c-designware module(s) after resuming

---
 dell/xps/13-9300/default.nix                  |  4 ++
 .../sleep-resume/i2c-designware/default.nix   | 42 +++++++++++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 dell/xps/sleep-resume/i2c-designware/default.nix

diff --git a/dell/xps/13-9300/default.nix b/dell/xps/13-9300/default.nix
index 6ec94ea..9c379ae 100644
--- a/dell/xps/13-9300/default.nix
+++ b/dell/xps/13-9300/default.nix
@@ -10,6 +10,7 @@ in {
     ../../../common/pc/laptop
     ../../../common/pc/laptop/acpi_call.nix
     ../../../common/pc/ssd
+    ../sleep-resume/i2c-designware
   ];
 
   # Force S3 sleep mode. See README.wiki for details.
@@ -26,4 +27,7 @@ in {
 
   # This will save you money and possibly your life!
   services.thermald.enable = mkDefault true;
+
+  # Reloads i2c-designware module after suspend
+  services.sleep-resume.i2c-designware.enable = mkDefault true;
 }
diff --git a/dell/xps/sleep-resume/i2c-designware/default.nix b/dell/xps/sleep-resume/i2c-designware/default.nix
new file mode 100644
index 0000000..55be549
--- /dev/null
+++ b/dell/xps/sleep-resume/i2c-designware/default.nix
@@ -0,0 +1,42 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (lib) mkIf mkOption types;
+
+  reloadDesignware = pkgs.writeShellApplication {
+    name = "reload-i2c-designware.sh";
+    runtimeInputs = [ pkgs.kmod ];
+    text = ''
+      # Reload the i2c Designware driver after resuming from sleep.
+
+      # Wait up-to 0.5 second for each module to be unloaded:
+      # (It should never take this long)
+      modprobe -r --wait 500 i2c_designware_platform
+      modprobe -r --wait 500 i2c_designware_core
+      modprobe -r --wait 500 i2c_hid_acpi
+      modprobe -r --wait 500 i2c_hid
+
+      # Should reload the module dependencies automatically:
+      modprobe i2c_designware_platform
+    '';
+  };
+
+  cfg = config.services.sleep-resume.i2c-designware;
+in {
+  options = {
+    services.sleep-resume.i2c-designware = {
+      enable = mkOption {
+        default = false;
+        type = types.bool;
+        description = "Reload the i2c_designware driver after resuming from sleep.";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    powerManagement.resumeCommands = "${reloadDesignware}/bin/reload-i2c-designware.sh";
+  };
+}
+
+
+