[PATCH] arm64: dts: qcom: glymur-lenovo-yoga-slim7x: add the camera privacy switch

[PATCH] arm64: dts: qcom: glymur-lenovo-yoga-slim7x: add the camera privacy switch

[Oleg Keri]

The laptop has a camera privacy switch on the side of the top case - a
slider, not a mechanical cover over the lens, and it does nothing to the
camera itself. TLMM gpio99 follows its position: high with the switch
open, low with it engaged. Describe it as a gpio-keys switch so userspace
can act on it.

SW_CAMERA_LENS_COVER is the only switch code the input layer has for a
camera privacy state, and it is what the Lenovo WMI camera driver and
Dell's privacy driver report for the same kind of electronic switch on
x86 machines, so use it here as well despite the name.

The embedded controller also raises event 0x29 whenever the switch
moves, which makes it tempting to report it from the EC driver instead.
That would be the wrong layer: the pin is a plain level that tracks the
slider position and needs no EC transaction to read, and the EC event
carries nothing the pin does not already say.

Signed-off-by: Oleg Keri <okerixx@gmail.com>
---
 .../boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts   | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts b/arch/arm64/boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts
index ecc8c34fb983..b5848991dffb 100644
--- a/arch/arm64/boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts
+++ b/arch/arm64/boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts
@@ -51,7 +51,7 @@ sleep_clk: sleep-clk {
 	gpio-keys {
 		compatible = "gpio-keys";
 
-		pinctrl-0 = <&hall_int_n_default>;
+		pinctrl-0 = <&hall_int_n_default>, <&cam_privacy_default>;
 		pinctrl-names = "default";
 
 		switch-lid {
@@ -62,6 +62,13 @@ switch-lid {
 			wakeup-source;
 			wakeup-event-action = <EV_ACT_DEASSERTED>;
 		};
+
+		switch-camera-privacy {
+			label = "camera privacy switch";
+			gpios = <&tlmm 99 GPIO_ACTIVE_LOW>;
+			linux,input-type = <EV_SW>;
+			linux,code = <SW_CAMERA_LENS_COVER>;
+		};
 	};
 
 	leds {
@@ -958,6 +965,12 @@ tpad_default: tpad-default-state {
 		bias-disable;
 	};
 
+	cam_privacy_default: cam-privacy-default-state {
+		pins = "gpio99";
+		function = "gpio";
+		bias-pull-up;
+	};
+
 	edp_bl_en: edp-bl-en-state {
 		pins = "gpio18";
 		function = "gpio";
-- 
2.55.0


base-commit: 68142f986ff04b2b70b31db00f719bf690f64a9a

Re: [PATCH] arm64: dts: qcom: glymur-lenovo-yoga-slim7x: add the camera privacy switch

[Konrad Dybcio]

On 9/14/26 10:16 AM, Oleg Keri wrote:
> The laptop has a camera privacy switch on the side of the top case - a
> slider, not a mechanical cover over the lens, and it does nothing to the
> camera itself. TLMM gpio99 follows its position: high with the switch
> open, low with it engaged. Describe it as a gpio-keys switch so userspace
> can act on it.
> 
> SW_CAMERA_LENS_COVER is the only switch code the input layer has for a
> camera privacy state, and it is what the Lenovo WMI camera driver and
> Dell's privacy driver report for the same kind of electronic switch on
> x86 machines, so use it here as well despite the name.
> 
> The embedded controller also raises event 0x29 whenever the switch
> moves, which makes it tempting to report it from the EC driver instead.
> That would be the wrong layer: the pin is a plain level that tracks the
> slider position and needs no EC transaction to read, and the EC event
> carries nothing the pin does not already say.
> 
> Signed-off-by: Oleg Keri <okerixx@gmail.com>
> ---
>  .../boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts   | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts b/arch/arm64/boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts
> index ecc8c34fb983..b5848991dffb 100644
> --- a/arch/arm64/boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts
> +++ b/arch/arm64/boot/dts/qcom/glymur-lenovo-yoga-slim7x.dts
> @@ -51,7 +51,7 @@ sleep_clk: sleep-clk {
>  	gpio-keys {
>  		compatible = "gpio-keys";
>  
> -		pinctrl-0 = <&hall_int_n_default>;
> +		pinctrl-0 = <&hall_int_n_default>, <&cam_privacy_default>;
>  		pinctrl-names = "default";
>  
>  		switch-lid {
> @@ -62,6 +62,13 @@ switch-lid {
>  			wakeup-source;
>  			wakeup-event-action = <EV_ACT_DEASSERTED>;
>  		};
> +
> +		switch-camera-privacy {
> +			label = "camera privacy switch";

nit: other DTs normally capitalize this

[...]

> +	cam_privacy_default: cam-privacy-default-state {
> +		pins = "gpio99";
> +		function = "gpio";
> +		bias-pull-up;
> +	};

And the pin entries are normally sorted by their GPIO index

Otherwise, this looks good!

Konrad