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input: misc: add driver for max16150
MAX16150/MAX16169 nanoPower Pushbutton On/Off Controller Signed-off-by: Marc Paolo Sosa <marcpaolo.sosa@analog.com>
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‎drivers/input/misc/Kconfig

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

‎drivers/input/misc/Makefile

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

‎drivers/input/misc/max16150.c

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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Analog Devices MAX16150/MAX16169 Pushbutton Driver
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*
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* Copyright 2025 Analog Devices Inc.
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*/
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/ktime.h>
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#include <linux/of.h>
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#include <linux/mod_devicetable.h>
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#define SHORT_PRESS_MIN_MS 32
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#define SHORT_PRESS_MAX_MS 127
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#define LONG_PRESS_MIN_MS 128
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struct max16150_data {
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struct input_dev *bttn;
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int key_event;
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ktime_t irq_rising_time;
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ktime_t irq_falling_time;
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};
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static irqreturn_t max16150_rise_irq(int irq, void *_data)
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{
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struct max16150_data *data = _data;
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struct input_dev *bttn = data->bttn;
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data->irq_rising_time = ktime_get();
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input_report_key(bttn, data->key_event, 1);
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input_sync(bttn);
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return IRQ_HANDLED;
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}
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static irqreturn_t max16150_fall_irq(int irq, void *_data)
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{
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struct max16150_data *data = _data;
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struct input_dev *bttn = data->bttn;
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struct device *dev = bttn->dev.parent;
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ktime_t irq_duration;
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unsigned long duration_ms;
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data->irq_falling_time = ktime_get();
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irq_duration = ktime_sub(data->irq_falling_time, data->irq_rising_time);
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duration_ms = ktime_to_ms(irq_duration);
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dev_dbg_ratelimited(dev, "Interrupt duration: %lu ms\n", duration_ms);
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if (duration_ms >= SHORT_PRESS_MIN_MS && duration_ms <= SHORT_PRESS_MAX_MS) {
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dev_info(dev, "Short press detected\n");
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input_event(bttn, EV_MSC, MSC_SCAN, 1);
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} else if (duration_ms >= LONG_PRESS_MIN_MS) {
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dev_info(dev, "Long press detected\n");
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input_event(bttn, EV_MSC, MSC_SCAN, 2);
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}
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input_report_key(bttn, data->key_event, 0);
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input_sync(bttn);
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return IRQ_HANDLED;
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}
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static int max16150_probe(struct platform_device *pdev)
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{
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struct max16150_data *data;
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struct input_dev *bttn;
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int fall_irq, rise_irq, err;
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struct device_node *np = pdev->dev.of_node;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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bttn = devm_input_allocate_device(&pdev->dev);
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if (!bttn) {
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dev_err(&pdev->dev, "Can't allocate input device\n");
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return -ENOMEM;
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}
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data->bttn = bttn;
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if (of_property_read_u32(np, "key-event", &data->key_event))
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data->key_event = KEY_POWER;
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bttn->name = "max16150";
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bttn->phys = "max16150/input0";
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bttn->id.bustype = BUS_HOST;
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input_set_capability(bttn, EV_KEY, data->key_event);
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input_set_capability(bttn, EV_MSC, MSC_SCAN);
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fall_irq = platform_get_irq(pdev, 0);
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if (fall_irq < 0)
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return fall_irq;
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rise_irq = platform_get_irq(pdev, 1);
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if (rise_irq < 0)
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return rise_irq;
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err = devm_request_threaded_irq(&pdev->dev, rise_irq, NULL,
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max16150_rise_irq,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"max16150_rising", data);
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if (err < 0) {
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dev_err(&pdev->dev, "Can't register rise irq: %d\n", err);
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return err;
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}
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err = devm_request_threaded_irq(&pdev->dev, fall_irq, NULL,
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max16150_fall_irq,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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"max16150_falling", data);
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if (err < 0) {
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dev_err(&pdev->dev, "Can't register fall irq: %d\n", err);
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return err;
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}
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err = input_register_device(bttn);
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if (err) {
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dev_err(&pdev->dev, "Can't register input device: %d\n", err);
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return err;
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}
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platform_set_drvdata(pdev, data);
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device_init_wakeup(&pdev->dev, true);
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return 0;
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}
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static const struct of_device_id max16150_of_match[] = {
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{ .compatible = "adi,max16150" },
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{ .compatible = "adi,max16169" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, max16150_of_match);
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static struct platform_driver max16150_driver = {
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.probe = max16150_probe,
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.driver = {
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.name = "max16150",
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.of_match_table = max16150_of_match,
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},
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};
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module_platform_driver(max16150_driver);
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MODULE_AUTHOR("Marc Paolo Sosa <marcpaolo.sosa@analog.com>");
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MODULE_DESCRIPTION("MAX16150/MAX16169 Pushbutton Driver");
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MODULE_LICENSE("GPL");

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