From 7069abcd5340f4c8dc4a96b814609b25d7e332ee Mon Sep 17 00:00:00 2001
From: Anthony Ruhier <aruhier@mailbox.org>
Date: Thu, 19 Dec 2024 17:05:08 +0100
Subject: [PATCH] arm64: dts: qcom: x1e80100-lenovo-yoga-slim7x: Add lid switch

Add the lid switch for the Lenovo Yoga Slim 7x.

Other x1e80100 laptops use the GPIO pin 92 only, however on the Yoga
Slim 7x this pin seems to be bridged with the pin 71. By default, the
pin 71 is set as output-high, which blocks any event on pin 92.

This patch sets the pin 71 as output-disable and sets the LID switch on
pin 92. This is aligned with how they're configured on Windows:
    GPIO  71 | 0xf147000 | in | func0 | hi | pull up   | 16 mA
    GPIO  92 | 0xf15c000 | in | func0 | lo | no pull   |  2 mA

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Tested-by: Maya Matuszczyk <maccraft123mc@gmail.com>
Signed-off-by: Anthony Ruhier <aruhier@mailbox.org>
Link: https://lore.kernel.org/r/20241219-patch-lenovo-yoga-v3-1-9c4a79068141@mailbox.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
---
 .../dts/qcom/x1e80100-lenovo-yoga-slim7x.dts  | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts b/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
index 3d7e0230dc03..5e314d8dba91 100644
--- a/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
+++ b/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
@@ -6,6 +6,7 @@
 /dts-v1/;
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/gpio-keys.h>
 #include <dt-bindings/regulator/qcom,rpmh-regulator.h>
 
 #include "x1e80100.dtsi"
@@ -23,6 +24,21 @@
 		stdout-path = "serial0:115200n8";
 	};
 
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		pinctrl-0 = <&hall_int_n_default>;
+		pinctrl-names = "default";
+
+		switch-lid {
+			gpios = <&tlmm 92 GPIO_ACTIVE_LOW>;
+			linux,input-type = <EV_SW>;
+			linux,code = <SW_LID>;
+			wakeup-source;
+			wakeup-event-action = <EV_ACT_DEASSERTED>;
+		};
+	};
+
 	pmic-glink {
 		compatible = "qcom,x1e80100-pmic-glink",
 			     "qcom,sm8550-pmic-glink",
@@ -819,6 +835,28 @@
 		bias-disable;
 	};
 
+	hall_int_n_default: hall-int-n-state {
+		lid-n-pins {
+			pins = "gpio92";
+			function = "gpio";
+			bias-disable;
+		};
+
+		/*
+		 * Pins 71 and 92 seem to be bridged together (pin 71 and 92 show the same
+		 * events). By default, pin 71 is set as output-high, which blocks any
+		 * event on pin 92. Output-disable on pin 71 is necessary to get events on
+		 * pin 92.
+		 * The purpose of pin 71 is not yet known; lid-pull is a supposition.
+		 */
+		lid-pull-n-pins {
+			pins = "gpio71";
+			function = "gpio";
+			bias-pull-up;
+			output-disable;
+		};
+	};
+
 	kybd_default: kybd-default-state {
 		pins = "gpio67";
 		function = "gpio";
-- 
2.50.1