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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2022 Richtek Technology Corp.
* Author: ChiYuan Huang <cy_huang@richtek.com>
*/
#include <linux/bits.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define RT5120_REG_INTSTAT 0x1E
#define RT5120_PWRKEYSTAT_MASK BIT(7)
struct rt5120_priv {
struct regmap *regmap;
struct input_dev *input;
};
static irqreturn_t rt5120_pwrkey_handler(int irq, void *devid)
{
struct rt5120_priv *priv = devid;
unsigned int stat;
int error;
error = regmap_read(priv->regmap, RT5120_REG_INTSTAT, &stat);
if (error)
return IRQ_NONE;
input_report_key(priv->input, KEY_POWER,
!(stat & RT5120_PWRKEYSTAT_MASK));
input_sync(priv->input);
return IRQ_HANDLED;
}
static int rt5120_pwrkey_probe(struct platform_device *pdev)
{
struct rt5120_priv *priv;
struct device *dev = &pdev->dev;
int press_irq, release_irq;
int error;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->regmap = dev_get_regmap(dev->parent, NULL);
if (!priv->regmap) {
dev_err(dev, "Failed to init regmap\n");
return -ENODEV;
}
press_irq = platform_get_irq_byname(pdev, "pwrkey-press");
if (press_irq < 0)
return press_irq;
release_irq = platform_get_irq_byname(pdev, "pwrkey-release");
if (release_irq < 0)
return release_irq;
/* Make input device be device resource managed */
priv->input = devm_input_allocate_device(dev);
if (!priv->input)
return -ENOMEM;
priv->input->name = "rt5120_pwrkey";
priv->input->phys = "rt5120_pwrkey/input0";
priv->input->id.bustype = BUS_I2C;
input_set_capability(priv->input, EV_KEY, KEY_POWER);
error = input_register_device(priv->input);
if (error) {
dev_err(dev, "Failed to register input device: %d\n", error);
return error;
}
error = devm_request_threaded_irq(dev, press_irq,
NULL, rt5120_pwrkey_handler,
0, "pwrkey-press", priv);
if (error) {
dev_err(dev,
"Failed to register pwrkey press irq: %d\n", error);
return error;
}
error = devm_request_threaded_irq(dev, release_irq,
NULL, rt5120_pwrkey_handler,
0, "pwrkey-release", priv);
if (error) {
dev_err(dev,
"Failed to register pwrkey release irq: %d\n", error);
return error;
}
return 0;
}
static const struct of_device_id r5120_pwrkey_match_table[] = {
{ .compatible = "richtek,rt5120-pwrkey" },
{}
};
MODULE_DEVICE_TABLE(of, r5120_pwrkey_match_table);
static struct platform_driver rt5120_pwrkey_driver = {
.driver = {
.name = "rt5120-pwrkey",
.of_match_table = r5120_pwrkey_match_table,
},
.probe = rt5120_pwrkey_probe,
};
module_platform_driver(rt5120_pwrkey_driver);
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_DESCRIPTION("Richtek RT5120 power key driver");
MODULE_LICENSE("GPL");
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