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