From 3af97a345bc078cea979e2406cf1990ef6ef0ded Mon Sep 17 00:00:00 2001
From: Gabriel Ebner <gebner@gebner.org>
Date: Mon, 28 Aug 2017 23:31:53 +0200
Subject: [PATCH] petalius: fix touchpad

---
 len0073.patch | 25 +++++++++++++++++++++++++
 petalius.nix  | 12 ++++++++++++
 2 files changed, 37 insertions(+)
 create mode 100644 len0073.patch

diff --git a/len0073.patch b/len0073.patch
new file mode 100644
index 0000000..d87594d
--- /dev/null
+++ b/len0073.patch
@@ -0,0 +1,25 @@
+diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
+index 16c3046..ca912ce 100644
+--- a/drivers/input/mouse/synaptics.c
++++ b/drivers/input/mouse/synaptics.c
+@@ -173,6 +173,7 @@ static const char * const smbus_pnp_ids[] = {
+ 	"LEN0046", /* X250 */
+ 	"LEN004a", /* W541 */
+ 	"LEN200f", /* T450s */
++       "LEN0073", /* X1 Carbon 5 (Elantech) */
+ 	NULL
+ };
+ 
+diff --git a/drivers/input/rmi4/rmi_smbus.c b/drivers/input/rmi4/rmi_smbus.c
+index 225025a..2939a2f 100644
+--- a/drivers/input/rmi4/rmi_smbus.c
++++ b/drivers/input/rmi4/rmi_smbus.c
+@@ -322,7 +322,7 @@ static int rmi_smb_probe(struct i2c_client *client,
+ 	rmi_dbg(RMI_DEBUG_XPORT, &client->dev, "Smbus version is %d",
+ 		smbus_version);
+ 
+-	if (smbus_version != 2) {
++       if (smbus_version != 2 && smbus_version != 3) {
+ 		dev_err(&client->dev, "Unrecognized SMB version %d\n",
+ 				smbus_version);
+ 		return -ENODEV;
diff --git a/petalius.nix b/petalius.nix
index 23c0d92..27e8fff 100644
--- a/petalius.nix
+++ b/petalius.nix
@@ -64,6 +64,18 @@
   #virtualisation.virtualbox.host.enable = true;
 
   # boot.kernelPackages = pkgs.lib.mkOverride 10 pkgs.linuxPackages;
+  boot.kernelPatches = [
+    { patch = ./len0073.patch; name = "len0073"; }
+  ];
+  boot.kernelParams = [
+    # "psmouse.synaptics_intertouch=1"
+    "psmouse.proto=imps"
+  ];
+  boot.kernelModules = [
+    "rmi_smbus"
+    "i2c_hid"
+    "psmouse"
+  ];
 
   # time.timeZone = pkgs.lib.mkOverride 10 "Europe/London";