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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/gpio/consumer.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/mod_devicetable.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#define MAX16150_LONG_INTERRUPT 120000000
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struct max16150_chip_info {
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bool has_clr_gpio;
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};
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struct max16150_device {
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const struct max16150_chip_info *chip_info;
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struct input_dev *input;
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struct gpio_desc *gpiod;
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struct gpio_desc *clr_gpiod;
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u64 low, high, duration;
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int irq;
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unsigned int keycode;
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};
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static irqreturn_t max16150_irq_handler(int irq, void *_max16150)
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{
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struct max16150_device *max16150 = _max16150;
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int value;
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value = gpiod_get_value(max16150->gpiod);
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if (value) {
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max16150->high = ktime_get_ns();
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if (max16150->low) {
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max16150->duration = max16150->high - max16150->low;
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if (max16150->duration > MAX16150_LONG_INTERRUPT) {
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if (max16150->chip_info->has_clr_gpio && max16150->clr_gpiod)
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gpiod_set_value(max16150->clr_gpiod, 1);
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input_report_key(max16150->input, max16150->keycode, 1);
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input_sync(max16150->input);
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}
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}
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} else {
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max16150->low = ktime_get_ns();
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}
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return IRQ_HANDLED;
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}
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static const struct max16150_chip_info max16150_variant_a = {
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.has_clr_gpio = true,
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};
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static const struct max16150_chip_info max16150_variant_b = {
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.has_clr_gpio = false,
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};
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static int max16150_probe(struct platform_device *pdev)
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{
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const struct max16150_chip_info *chip_info;
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struct max16150_device *max16150;
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int err;
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u32 keycode;
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chip_info = of_device_get_match_data(&pdev->dev);
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if (!chip_info)
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return -EINVAL;
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max16150 = devm_kzalloc(&pdev->dev, sizeof(*max16150), GFP_KERNEL);
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if (!max16150)
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return -ENOMEM;
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max16150->chip_info = chip_info;
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max16150->input = devm_input_allocate_device(&pdev->dev);
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if (!max16150->input)
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return -ENOMEM;
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max16150->input->name = "MAX16150 Pushbutton";
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max16150->input->phys = "max16150/input0";
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max16150->input->id.bustype = BUS_HOST;
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if (device_property_read_u32(&pdev->dev, "linux,code", &keycode))
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keycode = KEY_WAKEUP;
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max16150->keycode = keycode;
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input_set_capability(max16150->input, EV_KEY, max16150->keycode);
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max16150->gpiod = devm_gpiod_get(&pdev->dev, "interrupt", GPIOD_IN);
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if (IS_ERR(max16150->gpiod))
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return PTR_ERR(max16150->gpiod);
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if (chip_info->has_clr_gpio) {
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max16150->clr_gpiod = devm_gpiod_get(&pdev->dev, "clr", GPIOD_OUT_HIGH);
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if (IS_ERR(max16150->clr_gpiod)) {
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max16150->clr_gpiod = NULL;
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dev_warn(&pdev->dev,
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"clr GPIO undefined, clr pin will not be asserted\n");
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} else {
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gpiod_set_value(max16150->clr_gpiod, 0);
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}
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}
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max16150->irq = gpiod_to_irq(max16150->gpiod);
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if (max16150->irq < 0)
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return dev_err_probe(&pdev->dev, max16150->irq,
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"MAX16150: Failed to map GPIO to IRQ");
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dev_dbg(&pdev->dev, "MAX16150: Mapped GPIO to IRQ %d\n", max16150->irq);
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err = devm_request_irq(&pdev->dev, max16150->irq, max16150_irq_handler,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"max16150_irq", max16150);
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if (err)
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return err;
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err = input_register_device(max16150->input);
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if (err)
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return err;
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dev_dbg(&pdev->dev, "Driver initialized successfully\n");
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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,max16150a", .data = &max16150_variant_a },
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{ .compatible = "adi,max16150b", .data = &max16150_variant_b },
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{ .compatible = "adi,max16150c", .data = &max16150_variant_b },
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{ .compatible = "adi,max16169a", .data = &max16150_variant_a },
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{ .compatible = "adi,max16169b", .data = &max16150_variant_b },
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{ .compatible = "adi,max16169c", .data = &max16150_variant_b },
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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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