[PATCH 0/2] Asus ZenFone 2 Laser/Selfie includes a battery measured by voltage mode BMS and a simple GPIO hall effect sensor. The following commits include support for these components.

[PATCH 0/2] Asus ZenFone 2 Laser/Selfie includes a battery measured by voltage mode BMS and a simple GPIO hall effect sensor. The following commits include support for these components.

[Erikas Bitovtas]

Signed-off-by: Erikas Bitovtas <xerikasxx@gmail.com>
---
Erikas Bitovtas (2):
      arm64: dts: qcom: msm8939-asus-z00t: add battery
      arm64: dts: qcom: msm8939-asus-z00t: add hall sensor

 arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts | 36 +++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)
---
base-commit: 0f2995693867bfb26197b117cd55624ddc57582f
change-id: 20251115-battery-hall-30eb7fbba62c

Best regards,
-- 
Erikas Bitovtas <xerikasxx@gmail.com>

[PATCH 1/2] arm64: dts: qcom: msm8939-asus-z00t: add battery

[Erikas Bitovtas]

This device tracks remaining battery capacity percentage using voltage
mode BMS. This commit enables the pm8916_bms node and adds a battery
node to track its capacity. Battery properties were taken from the
downstream code and from the information printed on the battery itself.

Signed-off-by: Erikas Bitovtas <xerikasxx@gmail.com>
---
 arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts b/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
index ebb548e62e02..b58f0a04abfd 100644
--- a/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
+++ b/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
@@ -20,6 +20,25 @@ aliases {
 		serial0 = &blsp_uart2;
 	};
 
+	battery: battery {
+		compatible = "simple-battery";
+		device-chemistry = "lithium-ion-polymer";
+		voltage-min-design-microvolt = <3400000>;
+		voltage-max-design-microvolt = <4400000>;
+		energy-full-design-microwatt-hours = <11500000>;
+		charge-full-design-microamp-hours = <3000000>;
+
+		ocv-capacity-celsius = <25>;
+		ocv-capacity-table-0 = <4372000 100>, <4306000 95>, <4247000 90>,
+			<4190000 85>, <4134000 80>, <4081000 75>, <4030000 70>,
+			<3984000 65>, <3930000 60>, <3884000 55>, <3850000 50>,
+			<3826000 45>, <3804000 40>, <3786000 35>, <3770000 30>,
+			<3753000 25>, <3734000 20>, <3712000 16>, <3693000 13>,
+			<3686000 11>, <3684000 10>, <3682000 9>, <3680000 8>,
+			<3676000 7>, <3668000 6>, <3643000 5>, <3600000 4>,
+			<3542000 3>, <3462000 2>, <3340000 1>, <3000000 0>;
+	};
+
 	chosen {
 		stdout-path = "serial0";
 	};
@@ -135,6 +154,12 @@ &mpss_mem {
 	reg = <0x0 0x86800000 0x0 0x5500000>;
 };
 
+&pm8916_bms {
+	monitored-battery = <&battery>;
+
+	status = "okay";
+};
+
 &pm8916_codec {
 	qcom,micbias-lvl = <2800>;
 	qcom,mbhc-vthreshold-low = <75 150 237 450 500>;

-- 
2.51.2

[PATCH 2/2] arm64: dts: qcom: msm8939-asus-z00t: add hall sensor

[Erikas Bitovtas]

This device uses ANPEC APX9131 hall sensor. It is a basic GPIO hall
sensor for which a generic "gpio-keys" device tree node configuration
suffices.

Signed-off-by: Erikas Bitovtas <xerikasxx@gmail.com>
---
 arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts b/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
index b58f0a04abfd..60a714a62a2c 100644
--- a/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
+++ b/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
@@ -62,6 +62,15 @@ button-volume-down {
 			linux,code = <KEY_VOLUMEDOWN>;
 			debounce-interval = <15>;
 		};
+
+		event-hall-sensor {
+			label = "Hall Effect Sensor";
+			gpios = <&tlmm 108 GPIO_ACTIVE_LOW>;
+			linux,input-type = <EV_SW>;
+			linux,code = <SW_LID>;
+			linux,can-disable;
+			debounce-interval = <150>;
+		};
 	};
 
 	reg_sd_vmmc: regulator-sdcard-vmmc {
@@ -259,7 +268,7 @@ sd_vmmc_en_default: sd-vmmc-en-default-state {
 	};
 
 	gpio_keys_default: gpio-keys-default-state {
-		pins = "gpio107", "gpio117";
+		pins = "gpio107", "gpio108", "gpio117";
 		function = "gpio";
 		drive-strength = <2>;
 		bias-pull-up;

-- 
2.51.2

Re: [PATCH 1/2] arm64: dts: qcom: msm8939-asus-z00t: add battery

[Konrad Dybcio]

On 11/15/25 1:26 PM, Erikas Bitovtas wrote:
> This device tracks remaining battery capacity percentage using voltage
> mode BMS. This commit enables the pm8916_bms node and adds a battery
> node to track its capacity. Battery properties were taken from the
> downstream code and from the information printed on the battery itself.
> 
> Signed-off-by: Erikas Bitovtas <xerikasxx@gmail.com>
> ---
>  arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts b/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
> index ebb548e62e02..b58f0a04abfd 100644
> --- a/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
> +++ b/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
> @@ -20,6 +20,25 @@ aliases {
>  		serial0 = &blsp_uart2;
>  	};
>  
> +	battery: battery {
> +		compatible = "simple-battery";
> +		device-chemistry = "lithium-ion-polymer";
> +		voltage-min-design-microvolt = <3400000>;
> +		voltage-max-design-microvolt = <4400000>;
> +		energy-full-design-microwatt-hours = <11500000>;
> +		charge-full-design-microamp-hours = <3000000>;
> +
> +		ocv-capacity-celsius = <25>;
> +		ocv-capacity-table-0 = <4372000 100>, <4306000 95>, <4247000 90>,
> +			<4190000 85>, <4134000 80>, <4081000 75>, <4030000 70>,
> +			<3984000 65>, <3930000 60>, <3884000 55>, <3850000 50>,
> +			<3826000 45>, <3804000 40>, <3786000 35>, <3770000 30>,
> +			<3753000 25>, <3734000 20>, <3712000 16>, <3693000 13>,
> +			<3686000 11>, <3684000 10>, <3682000 9>, <3680000 8>,
> +			<3676000 7>, <3668000 6>, <3643000 5>, <3600000 4>,
> +			<3542000 3>, <3462000 2>, <3340000 1>, <3000000 0>;

I found a dts for this phone and it seems like there's 3 kinds of
batteries which quite obviously have disjoin characteristics

https://github.com/Asus-MSM8916/android_kernel_asus_msm8916/blob/10.x/arch/arm/boot/dts/qcom/ASUS_ZE550KL_1936167_3000mAh_3p4COV_VBMS_Final.dtsi

https://github.com/Asus-MSM8916/android_kernel_asus_msm8916/blob/10.x/arch/arm/boot/dts/qcom/ASUS_ZE550KL_1949572_3000mAh_3p4COV_VBMS_Final.dtsi

https://github.com/Asus-MSM8916/android_kernel_asus_msm8916/blob/10.x/arch/arm/boot/dts/qcom/ASUS_ZE550KL_2024958_3000mAh_120mAcc_3p4COV_VBMS_Final.dtsi

I don't think we have a mechanism to handle that in the kernel just yet..
At least documenting which one you based this data on would be nice..

Konrad

Re: [PATCH 2/2] arm64: dts: qcom: msm8939-asus-z00t: add hall sensor

[Konrad Dybcio]

On 11/15/25 1:26 PM, Erikas Bitovtas wrote:
> This device uses ANPEC APX9131 hall sensor. It is a basic GPIO hall
> sensor for which a generic "gpio-keys" device tree node configuration
> suffices.
> 
> Signed-off-by: Erikas Bitovtas <xerikasxx@gmail.com>
> ---
>  arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts b/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
> index b58f0a04abfd..60a714a62a2c 100644
> --- a/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
> +++ b/arch/arm64/boot/dts/qcom/msm8939-asus-z00t.dts
> @@ -62,6 +62,15 @@ button-volume-down {
>  			linux,code = <KEY_VOLUMEDOWN>;
>  			debounce-interval = <15>;
>  		};
> +
> +		event-hall-sensor {
> +			label = "Hall Effect Sensor";
> +			gpios = <&tlmm 108 GPIO_ACTIVE_LOW>;
> +			linux,input-type = <EV_SW>;
> +			linux,code = <SW_LID>;
> +			linux,can-disable;
> +			debounce-interval = <150>;
> +		};
>  	};
>  
>  	reg_sd_vmmc: regulator-sdcard-vmmc {
> @@ -259,7 +268,7 @@ sd_vmmc_en_default: sd-vmmc-en-default-state {
>  	};
>  
>  	gpio_keys_default: gpio-keys-default-state {
> -		pins = "gpio107", "gpio117";
> +		pins = "gpio107", "gpio108", "gpio117";

I think it'd make sense to keep it a separate entry

Konrad