--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/firmware/imx/sci.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+
+#define DEBOUNCE_TIME 30
+#define REPEAT_INTERVAL 60
+
+#define SC_IRQ_BUTTON 1
+#define SC_IRQ_GROUP_WAKE 3
+
+#define IMX_SC_MISC_FUNC_GET_BUTTON_STATUS 18
+
+struct imx_key_drv_data {
+ u32 keycode;
+ bool keystate; /* true: pressed, false: released */
+ struct delayed_work check_work;
+ struct input_dev *input;
+ struct imx_sc_ipc *key_ipc_handle;
+ struct notifier_block key_notifier;
+};
+
+struct imx_sc_msg_key {
+ struct imx_sc_rpc_msg hdr;
+ u8 state;
+};
+
+static int imx_sc_key_notify(struct notifier_block *nb,
+ unsigned long event, void *group)
+{
+ struct imx_key_drv_data *priv =
+ container_of(nb,
+ struct imx_key_drv_data,
+ key_notifier);
+
+ if ((event & SC_IRQ_BUTTON) && (*(u8 *)group == SC_IRQ_GROUP_WAKE)) {
+ schedule_delayed_work(&priv->check_work,
+ msecs_to_jiffies(DEBOUNCE_TIME));
+ pm_wakeup_event(priv->input->dev.parent, 0);
+ }
+
+ return 0;
+}
+
+static void imx_sc_check_for_events(struct work_struct *work)
+{
+ struct imx_key_drv_data *priv =
+ container_of(work,
+ struct imx_key_drv_data,
+ check_work.work);
+ struct input_dev *input = priv->input;
+ struct imx_sc_msg_key msg;
+ struct imx_sc_rpc_msg *hdr = &msg.hdr;
+ bool state;
+ int error;
+
+ hdr->ver = IMX_SC_RPC_VERSION;
+ hdr->svc = IMX_SC_RPC_SVC_MISC;
+ hdr->func = IMX_SC_MISC_FUNC_GET_BUTTON_STATUS;
+ hdr->size = 1;
+
+ error = imx_scu_call_rpc(priv->key_ipc_handle, &msg, true);
+ if (error) {
+ dev_err(&input->dev, "read imx sc key failed, error %d\n", error);
+ return;
+ }
+
+ state = (bool)msg.state;
+
+ if (state ^ priv->keystate) {
+ priv->keystate = state;
+ input_event(input, EV_KEY, priv->keycode, state);
+ input_sync(input);
+ if (!priv->keystate)
+ pm_relax(priv->input->dev.parent);
+ }
+
+ if (state)
+ schedule_delayed_work(&priv->check_work,
+ msecs_to_jiffies(REPEAT_INTERVAL));
+}
+
+static int imx_sc_key_probe(struct platform_device *pdev)
+{
+ struct imx_key_drv_data *priv;
+ struct input_dev *input;
+ int error;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ error = imx_scu_get_handle(&priv->key_ipc_handle);
+ if (error)
+ return error;
+
+ if (device_property_read_u32(&pdev->dev, "linux,keycodes",
+ &priv->keycode)) {
+ dev_err(&pdev->dev, "missing linux,keycodes property\n");
+ return -EINVAL;
+ }
+
+ INIT_DELAYED_WORK(&priv->check_work, imx_sc_check_for_events);
+
+ input = devm_input_allocate_device(&pdev->dev);
+ if (!input) {
+ dev_err(&pdev->dev, "failed to allocate the input device\n");
+ return -ENOMEM;
+ }
+
+ input->name = pdev->name;
+ input->phys = "imx-sc-key/input0";
+ input->id.bustype = BUS_HOST;
+
+ input_set_capability(input, EV_KEY, priv->keycode);
+
+ error = input_register_device(input);
+ if (error) {
+ dev_err(&pdev->dev, "failed to register input device\n");
+ return error;
+ }
+
+ priv->input = input;
+ platform_set_drvdata(pdev, priv);
+
+ error = imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE, SC_IRQ_BUTTON,
+ true);
+ if (error) {
+ dev_err(&pdev->dev, "failed to enable scu group irq\n");
+ return error;
+ }
+
+ priv->key_notifier.notifier_call = imx_sc_key_notify;
+ error = imx_scu_irq_register_notifier(&priv->key_notifier);
+ if (error) {
+ imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE, SC_IRQ_BUTTON,
+ false);
+ dev_err(&pdev->dev, "failed to register scu notifier\n");
+ return error;
+ }
+
+ return 0;
+}
+
+static int imx_sc_key_remove(struct platform_device *pdev)
+{
+ struct imx_key_drv_data *priv = platform_get_drvdata(pdev);
+
+ imx_scu_irq_group_enable(SC_IRQ_GROUP_WAKE, SC_IRQ_BUTTON, false);
+ imx_scu_irq_unregister_notifier(&priv->key_notifier);
+ cancel_delayed_work_sync(&priv->check_work);
+
+ return 0;
+}
+
+static const struct of_device_id imx_sc_key_ids[] = {
+ { .compatible = "fsl,imx-sc-key" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_sc_key_ids);
+
+static struct platform_driver imx_sc_key_driver = {
+ .driver = {
+ .name = "imx-sc-key",
+ .of_match_table = imx_sc_key_ids,
+ },
+ .probe = imx_sc_key_probe,
+ .remove = imx_sc_key_remove,
+};
+module_platform_driver(imx_sc_key_driver);
+
+MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
+MODULE_DESCRIPTION("i.MX System Controller Key Driver");
+MODULE_LICENSE("GPL v2");
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