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// SPDX-License-Identifier: GPL-2.0
/*
* power button driver for TI TPS6594 PMICs
*
* Copyright (C) 2025 Critical Link LLC - https://www.criticallink.com/
*/
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/tps6594.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
struct tps6594_pwrbutton {
struct device *dev;
struct input_dev *idev;
char phys[32];
};
static irqreturn_t tps6594_pb_push_irq(int irq, void *_pwr)
{
struct tps6594_pwrbutton *pwr = _pwr;
input_report_key(pwr->idev, KEY_POWER, 1);
pm_wakeup_event(pwr->dev, 0);
input_sync(pwr->idev);
return IRQ_HANDLED;
}
static irqreturn_t tps6594_pb_release_irq(int irq, void *_pwr)
{
struct tps6594_pwrbutton *pwr = _pwr;
input_report_key(pwr->idev, KEY_POWER, 0);
input_sync(pwr->idev);
return IRQ_HANDLED;
}
static int tps6594_pb_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct tps6594_pwrbutton *pwr;
struct input_dev *idev;
int error;
int push_irq;
int release_irq;
pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
if (!pwr)
return -ENOMEM;
idev = devm_input_allocate_device(dev);
if (!idev)
return -ENOMEM;
idev->name = pdev->name;
snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
pdev->name);
idev->phys = pwr->phys;
idev->id.bustype = BUS_I2C;
input_set_capability(idev, EV_KEY, KEY_POWER);
pwr->dev = dev;
pwr->idev = idev;
device_init_wakeup(dev, true);
push_irq = platform_get_irq(pdev, 0);
if (push_irq < 0)
return -EINVAL;
release_irq = platform_get_irq(pdev, 1);
if (release_irq < 0)
return -EINVAL;
error = devm_request_threaded_irq(dev, push_irq, NULL,
tps6594_pb_push_irq,
IRQF_ONESHOT,
pdev->resource[0].name, pwr);
if (error) {
dev_err(dev, "failed to request push IRQ #%d: %d\n", push_irq,
error);
return error;
}
error = devm_request_threaded_irq(dev, release_irq, NULL,
tps6594_pb_release_irq,
IRQF_ONESHOT,
pdev->resource[1].name, pwr);
if (error) {
dev_err(dev, "failed to request release IRQ #%d: %d\n",
release_irq, error);
return error;
}
error = input_register_device(idev);
if (error) {
dev_err(dev, "Can't register power button: %d\n", error);
return error;
}
return 0;
}
static const struct platform_device_id tps6594_pwrbtn_id_table[] = {
{ "tps6594-pwrbutton", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, tps6594_pwrbtn_id_table);
static struct platform_driver tps6594_pb_driver = {
.probe = tps6594_pb_probe,
.driver = {
.name = "tps6594_pwrbutton",
},
.id_table = tps6594_pwrbtn_id_table,
};
module_platform_driver(tps6594_pb_driver);
MODULE_DESCRIPTION("TPS6594 Power Button");
MODULE_LICENSE("GPL");
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