[4/4] input: misc: rt5120: Add power key support

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index dd5227c..9c0d814 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -881,6 +881,15 @@  config INPUT_SC27XX_VIBRA
 	  To compile this driver as a module, choose M here. The module will
 	  be called sc27xx_vibra.
 
+config INPUT_RT5120_PWRKEY
+	tristate "RT5120 PMIC power key support"
+	depends on MFD_RT5120
+	help
+	  This enables support for RT5120 PMIC power key driver.
+
+	  To compile this driver as a module, choose M here. the module will
+	  be called rt5120-pwerkey.
+
 config INPUT_STPMIC1_ONKEY
 	tristate "STPMIC1 PMIC Onkey support"
 	depends on MFD_STPMIC1
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index b92c53a..164ea20 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -68,6 +68,7 @@  obj-$(CONFIG_INPUT_RAVE_SP_PWRBUTTON)	+= rave-sp-pwrbutton.o
 obj-$(CONFIG_INPUT_RB532_BUTTON)	+= rb532_button.o
 obj-$(CONFIG_INPUT_REGULATOR_HAPTIC)	+= regulator-haptic.o
 obj-$(CONFIG_INPUT_RETU_PWRBUTTON)	+= retu-pwrbutton.o
+obj-$(CONFIG_INPUT_RT5120_PWRKEY)	+= rt5120-pwrkey.o
 obj-$(CONFIG_INPUT_AXP20X_PEK)		+= axp20x-pek.o
 obj-$(CONFIG_INPUT_GPIO_ROTARY_ENCODER)	+= rotary_encoder.o
 obj-$(CONFIG_INPUT_RK805_PWRKEY)	+= rk805-pwrkey.o
diff --git a/drivers/input/misc/rt5120-pwrkey.c b/drivers/input/misc/rt5120-pwrkey.c
new file mode 100644
index 00000000..42bd2f3
--- /dev/null
+++ b/drivers/input/misc/rt5120-pwrkey.c
@@ -0,0 +1,115 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+
+#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;
+	int press_irq;
+	int release_irq;
+};
+
+static irqreturn_t rt5120_pwrkey_handler(int irq, void *devid)
+{
+	struct rt5120_priv *priv = devid;
+	unsigned int stat;
+	bool is_pressed;
+	int ret;
+
+	ret = regmap_read(priv->regmap, RT5120_REG_INTSTAT, &stat);
+	if (ret)
+		return IRQ_NONE;
+
+	is_pressed = !(stat & RT5120_PWRKEYSTAT_MASK);
+
+	if ((is_pressed && irq == priv->press_irq) ||
+	    (!is_pressed  && irq == priv->release_irq)) {
+		input_report_key(priv->input, KEY_POWER, is_pressed);
+		input_sync(priv->input);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int rt5120_pwrkey_probe(struct platform_device *pdev)
+{
+	struct rt5120_priv *priv;
+	int ret;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!priv->regmap) {
+		dev_err(&pdev->dev, "Failed to init regmap\n");
+		return -ENODEV;
+	}
+
+	priv->press_irq = platform_get_irq_byname(pdev, "pwrkey-press");
+	if (priv->press_irq < 0)
+		return priv->press_irq;
+
+	priv->release_irq = platform_get_irq_byname(pdev, "pwrkey-release");
+	if (priv->release_irq < 0)
+		return priv->release_irq;
+
+	/* Make input device be device resource managed */
+	priv->input = devm_input_allocate_device(&pdev->dev);
+	if (!priv->input) {
+		dev_err(&pdev->dev, "Failed to allocate input device\n");
+		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);
+
+	ret = input_register_device(priv->input);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register input device\n");
+		return ret;
+	}
+
+	ret = devm_request_threaded_irq(&pdev->dev, priv->press_irq, NULL,
+					rt5120_pwrkey_handler, 0,
+					"pwrkey-press", priv);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register pwrkey press irq\n");
+		return ret;
+	}
+
+	return devm_request_threaded_irq(&pdev->dev, priv->release_irq, NULL,
+					 rt5120_pwrkey_handler, 0,
+					 "pwrkey-release", priv);
+}
+
+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 v2");