1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 *  Airplane mode button for AMD, HP & Xiaomi laptops
  4 *
  5 *  Copyright (C) 2014-2017 Alex Hung <alex.hung@canonical.com>
  6 *  Copyright (C) 2021 Advanced Micro Devices
  7 */
  8
  9#include <linux/kernel.h>
 10#include <linux/module.h>
 11#include <linux/init.h>
 12#include <linux/input.h>
 13#include <linux/platform_device.h>
 14#include <linux/acpi.h>
 15#include <acpi/acpi_bus.h>
 16
 17MODULE_LICENSE("GPL");
 18MODULE_AUTHOR("Alex Hung");
 19MODULE_ALIAS("acpi*:HPQ6001:*");
 20MODULE_ALIAS("acpi*:WSTADEF:*");
 21MODULE_ALIAS("acpi*:AMDI0051:*");
 22
 23static struct input_dev *wl_input_dev;
 24
 25static const struct acpi_device_id wl_ids[] = {
 26	{"HPQ6001", 0},
 27	{"WSTADEF", 0},
 28	{"AMDI0051", 0},
 29	{"", 0},
 30};
 31
 32static int wireless_input_setup(void)
 33{
 34	int err;
 35
 36	wl_input_dev = input_allocate_device();
 37	if (!wl_input_dev)
 38		return -ENOMEM;
 39
 40	wl_input_dev->name = "Wireless hotkeys";
 41	wl_input_dev->phys = "hpq6001/input0";
 42	wl_input_dev->id.bustype = BUS_HOST;
 43	wl_input_dev->evbit[0] = BIT(EV_KEY);
 44	set_bit(KEY_RFKILL, wl_input_dev->keybit);
 45
 46	err = input_register_device(wl_input_dev);
 47	if (err)
 48		goto err_free_dev;
 49
 50	return 0;
 51
 52err_free_dev:
 53	input_free_device(wl_input_dev);
 54	return err;
 55}
 56
 57static void wireless_input_destroy(void)
 58{
 59	input_unregister_device(wl_input_dev);
 60}
 61
 62static void wl_notify(struct acpi_device *acpi_dev, u32 event)
 63{
 64	if (event != 0x80) {
 65		pr_info("Received unknown event (0x%x)\n", event);
 66		return;
 67	}
 68
 69	input_report_key(wl_input_dev, KEY_RFKILL, 1);
 70	input_sync(wl_input_dev);
 71	input_report_key(wl_input_dev, KEY_RFKILL, 0);
 72	input_sync(wl_input_dev);
 73}
 74
 75static int wl_add(struct acpi_device *device)
 76{
 77	int err;
 78
 79	err = wireless_input_setup();
 80	if (err)
 81		pr_err("Failed to setup wireless hotkeys\n");
 82
 83	return err;
 84}
 85
 86static int wl_remove(struct acpi_device *device)
 87{
 88	wireless_input_destroy();
 89	return 0;
 90}
 91
 92static struct acpi_driver wl_driver = {
 93	.name	= "wireless-hotkey",
 94	.owner	= THIS_MODULE,
 95	.ids	= wl_ids,
 96	.ops	= {
 97		.add	= wl_add,
 98		.remove	= wl_remove,
 99		.notify	= wl_notify,
100	},
101};
102
103module_acpi_driver(wl_driver);