Add support for MAX16150/MAX16169

Documentation/devicetree/bindings/input/adi,max16150.yaml

@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/adi,max16150.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices MAX16150/MAX16169 nanoPower Pushbutton On/Off Controller
+
+maintainers:
+  - Marc Paolo Sosa <[email protected]>
+
+description: |
+  The MAX16150/MAX16169 is a low-power pushbutton on/off controller with a switch
+  debouncer and built-in latch. It accepts a noisy input from a mechanical switch
+  and produces a clean latched output, as well as a one-shot interrupt output.
+
+properties:
+  compatible:
+    description: |
+      Specifies the supported device variants. The MAX16150 and MAX16169 are supported.
+    enum:
+      - adi,max16150
+      - adi,max16169
+
+  interrupts:
+    description: Interrupt pin connected to the device.
+    maxItems: 1
+
+  linux,code:
+    description: |
+      Specifies a single numeric keycode value to be used for reporting
+      button/switch events. Specify KEY_RESERVED (0) to opt out of event
+      reporting.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    maximum: 0x2ff
+
+required:
+  - compatible
+  - linux,code
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/input/linux-event-codes.h>
+
+    power-button {
+        compatible = "adi,max16150";
+        interrupt-parent = <&gpio>;
+        interrupts = <17 IRQ_TYPE_EDGE_BOTH>;
+        linux,code = <KEY_POWER>;
+    };

drivers/input/Kconfig.adi

@@ -15,3 +15,4 @@ config INPUT_ALL_ADI_DRIVERS
 	imply INPUT_AD714X
 	imply INPUT_AD714X_I2C
 	imply INPUT_AD714X_SPI
+	imply INPUT_MAX16150_PWRBUTTON

drivers/input/misc/Kconfig

@@ -150,6 +150,15 @@ config INPUT_E3X0_BUTTON
 	  To compile this driver as a module, choose M here: the
 	  module will be called e3x0_button.
 
+config INPUT_MAX16150_PWRBUTTON
+	tristate "MAX16150/MAX16169 Pushbutton driver"
+	help
+	  Say Y here if you want to enable power key reporting via
+	  MAX16150/MAX16169 nanoPower Pushbutton On/Off Controller.
+
+	  To compile this driver as a module, choose M here. The module will
+	  be called max16150.
+
 config INPUT_PCSPKR
 	tristate "PC Speaker support"
 	depends on PCSPKR_PLATFORM

drivers/input/misc/Makefile

@@ -49,6 +49,7 @@ obj-$(CONFIG_INPUT_IQS7222)		+= iqs7222.o
 obj-$(CONFIG_INPUT_KEYSPAN_REMOTE)	+= keyspan_remote.o
 obj-$(CONFIG_INPUT_KXTJ9)		+= kxtj9.o
 obj-$(CONFIG_INPUT_M68K_BEEP)		+= m68kspkr.o
+obj-$(CONFIG_INPUT_MAX16150_PWRBUTTON)	+= max16150.o
 obj-$(CONFIG_INPUT_MAX77650_ONKEY)	+= max77650-onkey.o
 obj-$(CONFIG_INPUT_MAX77693_HAPTIC)	+= max77693-haptic.o
 obj-$(CONFIG_INPUT_MAX8925_ONKEY)	+= max8925_onkey.o

drivers/input/misc/max16150.c

@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Analog Devices MAX16150/MAX16169 Pushbutton Driver
+ *
+ * Copyright 2025 Analog Devices Inc.
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/ktime.h>
+#include <linux/of.h>
+
+struct max16150_data {
+	struct input_dev *bttn;
+	int custom_key_event;
+	ktime_t irq_rising_time;
+	ktime_t irq_falling_time;
+};
+
+static irqreturn_t max16150_rise_irq(int irq, void *_data)
+{
+	struct max16150_data *data = _data;
+	struct input_dev *bttn = data->bttn;
+	struct device *dev = bttn->dev.parent;
+
+	data->irq_rising_time = ktime_get();
+
+	ktime_t irq_low_duration = ktime_sub(data->irq_rising_time,
+					     data->irq_falling_time);
+	unsigned long duration_ms = ktime_to_ms(irq_low_duration);
+
+	dev_info(dev, "Interrupt low duration: %lu ms\n", duration_ms);
+
+	input_report_key(bttn, data->custom_key_event, 1);
+	input_sync(bttn);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t max16150_fall_irq(int irq, void *_data)
+{
+	struct max16150_data *data = _data;
+	struct input_dev *bttn = data->bttn;
+
+	data->irq_falling_time = ktime_get();
+
+	input_report_key(bttn, KEY_POWER, 0);
+	input_sync(bttn);
+
+	return IRQ_HANDLED;
+}
+
+static int max16150_probe(struct platform_device *pdev)
+{
+	struct max16150_data *data;
+	struct input_dev *bttn;
+	int fall_irq, rise_irq;
+	int err;
+	struct device_node *np = pdev->dev.of_node;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	bttn = devm_input_allocate_device(&pdev->dev);
+	if (!bttn) {
+		dev_err(&pdev->dev, "Can't allocate power button\n");
+		return -ENOMEM;
+	}
+
+	data->bttn = bttn;
+	data->custom_key_event = KEY_POWER;
+
+	bttn->name = "max16150";
+	bttn->phys = "max16150/input0";
+	bttn->id.bustype = BUS_HOST;
+	input_set_capability(bttn, EV_KEY, KEY_POWER);
+
+	fall_irq = platform_get_irq(pdev, 0);
+	if (fall_irq < 0)
+		return fall_irq;
+
+	rise_irq = platform_get_irq(pdev, 1);
+	if (rise_irq < 0)
+		return rise_irq;
+
+	err = devm_request_threaded_irq(&pdev->dev, rise_irq, NULL,
+					max16150_rise_irq,
+					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+					"max16150_rising", data);
+	if (err < 0) {
+		dev_err(&pdev->dev, "Can't register rise irq: %d\n", err);
+		return err;
+	}
+
+	err = devm_request_threaded_irq(&pdev->dev, fall_irq, NULL,
+					max16150_fall_irq,
+					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					"max16150_falling", data);
+	if (err < 0) {
+		dev_err(&pdev->dev, "Can't register fall irq: %d\n", err);
+		return err;
+	}
+
+	err = input_register_device(bttn);
+	if (err) {
+		dev_err(&pdev->dev, "Can't register power button: %d\n", err);
+		return err;
+	}
+
+	platform_set_drvdata(pdev, data);
+	device_init_wakeup(&pdev->dev, true);
+
+	if (np) {
+		u32 key_event;
+
+		if (!of_property_read_u32(np, "linux,code", &key_event))
+			data->custom_key_event = key_event;
+		else
+			dev_warn(&pdev->dev, "Failed to read custom key event, using default\n");
+	}
+
+	return 0;
+}
+
+static const struct of_device_id max16150_of_match[] = {
+	{ .compatible = "adi,max16150" },
+	{ .compatible = "adi,max16169" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max16150_of_match);
+
+static struct platform_driver max16150_driver = {
+	.probe = max16150_probe,
+	.driver = {
+		.name = "max16150",
+		.of_match_table = max16150_of_match,
+	},
+};
+module_platform_driver(max16150_driver);
+
+MODULE_AUTHOR("Marc Paolo Sosa <[email protected]>");
+MODULE_DESCRIPTION("MAX16150/MAX16169 Pushbutton Driver");
+MODULE_LICENSE("GPL");