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-rw-r--r--drivers/platform/x86/wireless-hotkey.c103
1 files changed, 103 insertions, 0 deletions
diff --git a/drivers/platform/x86/wireless-hotkey.c b/drivers/platform/x86/wireless-hotkey.c
new file mode 100644
index 000000000..11c60a273
--- /dev/null
+++ b/drivers/platform/x86/wireless-hotkey.c
@@ -0,0 +1,103 @@
+// 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:*");
+
+static struct input_dev *wl_input_dev;
+
+static const struct acpi_device_id wl_ids[] = {
+ {"HPQ6001", 0},
+ {"WSTADEF", 0},
+ {"AMDI0051", 0},
+ {"", 0},
+};
+
+static int wireless_input_setup(void)
+{
+ int err;
+
+ wl_input_dev = input_allocate_device();
+ if (!wl_input_dev)
+ return -ENOMEM;
+
+ wl_input_dev->name = "Wireless hotkeys";
+ wl_input_dev->phys = "hpq6001/input0";
+ wl_input_dev->id.bustype = BUS_HOST;
+ wl_input_dev->evbit[0] = BIT(EV_KEY);
+ set_bit(KEY_RFKILL, wl_input_dev->keybit);
+
+ err = input_register_device(wl_input_dev);
+ if (err)
+ goto err_free_dev;
+
+ return 0;
+
+err_free_dev:
+ input_free_device(wl_input_dev);
+ return err;
+}
+
+static void wireless_input_destroy(void)
+{
+ input_unregister_device(wl_input_dev);
+}
+
+static void wl_notify(struct acpi_device *acpi_dev, u32 event)
+{
+ if (event != 0x80) {
+ pr_info("Received unknown event (0x%x)\n", event);
+ return;
+ }
+
+ input_report_key(wl_input_dev, KEY_RFKILL, 1);
+ input_sync(wl_input_dev);
+ input_report_key(wl_input_dev, KEY_RFKILL, 0);
+ input_sync(wl_input_dev);
+}
+
+static int wl_add(struct acpi_device *device)
+{
+ int err;
+
+ err = wireless_input_setup();
+ if (err)
+ pr_err("Failed to setup wireless hotkeys\n");
+
+ return err;
+}
+
+static int wl_remove(struct acpi_device *device)
+{
+ wireless_input_destroy();
+ return 0;
+}
+
+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);