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path: root/drivers/input/misc/rt5120-pwrkey.c
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Diffstat (limited to 'drivers/input/misc/rt5120-pwrkey.c')
-rw-r--r--drivers/input/misc/rt5120-pwrkey.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/drivers/input/misc/rt5120-pwrkey.c b/drivers/input/misc/rt5120-pwrkey.c
new file mode 100644
index 0000000000..8a8c1aeeed
--- /dev/null
+++ b/drivers/input/misc/rt5120-pwrkey.c
@@ -0,0 +1,120 @@
+// 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");