1 files changed, 122 insertions, 0 deletions
diff --git a/drivers/platform/x86/wireless-hotkey.c b/drivers/platform/x86/wireless-hotkey.c
new file mode 100644
index 0000000000..4422863f47
--- /dev/null
+++ b/drivers/platform/x86/wireless-hotkey.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Airplane mode button for AMD, HP & Xiaomi laptops
+ *
+ *  Copyright (C) 2014-2017 Alex Hung <alex.hung@canonical.com>
+ *  Copyright (C) 2021 Advanced Micro Devices
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/acpi.h>
+#include <acpi/acpi_bus.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alex Hung");
+MODULE_ALIAS("acpi*:HPQ6001:*");
+MODULE_ALIAS("acpi*:WSTADEF:*");
+MODULE_ALIAS("acpi*:AMDI0051:*");
+
+struct wl_button {
+	struct input_dev *input_dev;
+	char phys[32];
+};
+
+static const struct acpi_device_id wl_ids[] = {
+	{"HPQ6001", 0},
+	{"WSTADEF", 0},
+	{"AMDI0051", 0},
+	{"", 0},
+};
+
+static int wireless_input_setup(struct acpi_device *device)
+{
+	struct wl_button *button = acpi_driver_data(device);
+	int err;
+
+	button->input_dev = input_allocate_device();
+	if (!button->input_dev)
+		return -ENOMEM;
+
+	snprintf(button->phys, sizeof(button->phys), "%s/input0", acpi_device_hid(device));
+
+	button->input_dev->name = "Wireless hotkeys";
+	button->input_dev->phys = button->phys;
+	button->input_dev->id.bustype = BUS_HOST;
+	button->input_dev->evbit[0] = BIT(EV_KEY);
+	set_bit(KEY_RFKILL, button->input_dev->keybit);
+
+	err = input_register_device(button->input_dev);
+	if (err)
+		goto err_free_dev;
+
+	return 0;
+
+err_free_dev:
+	input_free_device(button->input_dev);
+	return err;
+}
+
+static void wireless_input_destroy(struct acpi_device *device)
+{
+	struct wl_button *button = acpi_driver_data(device);
+
+	input_unregister_device(button->input_dev);
+	kfree(button);
+}
+
+static void wl_notify(struct acpi_device *acpi_dev, u32 event)
+{
+	struct wl_button *button = acpi_driver_data(acpi_dev);
+
+	if (event != 0x80) {
+		pr_info("Received unknown event (0x%x)\n", event);
+		return;
+	}
+
+	input_report_key(button->input_dev, KEY_RFKILL, 1);
+	input_sync(button->input_dev);
+	input_report_key(button->input_dev, KEY_RFKILL, 0);
+	input_sync(button->input_dev);
+}
+
+static int wl_add(struct acpi_device *device)
+{
+	struct wl_button *button;
+	int err;
+
+	button = kzalloc(sizeof(struct wl_button), GFP_KERNEL);
+	if (!button)
+		return -ENOMEM;
+
+	device->driver_data = button;
+
+	err = wireless_input_setup(device);
+	if (err) {
+		pr_err("Failed to setup wireless hotkeys\n");
+		kfree(button);
+	}
+
+	return err;
+}
+
+static void wl_remove(struct acpi_device *device)
+{
+	wireless_input_destroy(device);
+}
+
+static struct acpi_driver wl_driver = {
+	.name	= "wireless-hotkey",
+	.owner	= THIS_MODULE,
+	.ids	= wl_ids,
+	.ops	= {
+		.add	= wl_add,
+		.remove	= wl_remove,
+		.notify	= wl_notify,
+	},
+};
+
+module_acpi_driver(wl_driver);