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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Airplane mode button for AMD, HP & Xiaomi laptops4 *5 * Copyright (C) 2014-2017 Alex Hung <alex.hung@canonical.com>6 * Copyright (C) 2021 Advanced Micro Devices7 */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_DESCRIPTION("Airplane mode button for AMD, HP & Xiaomi laptops");18MODULE_LICENSE("GPL");19MODULE_AUTHOR("Alex Hung");20MODULE_ALIAS("acpi*:HPQ6001:*");21MODULE_ALIAS("acpi*:WSTADEF:*");22MODULE_ALIAS("acpi*:AMDI0051:*");23MODULE_ALIAS("acpi*:LGEX0815:*");24 25struct wl_button {26 struct input_dev *input_dev;27 char phys[32];28};29 30static const struct acpi_device_id wl_ids[] = {31 {"HPQ6001", 0},32 {"WSTADEF", 0},33 {"AMDI0051", 0},34 {"LGEX0815", 0},35 {"", 0},36};37 38static int wireless_input_setup(struct acpi_device *device)39{40 struct wl_button *button = acpi_driver_data(device);41 int err;42 43 button->input_dev = input_allocate_device();44 if (!button->input_dev)45 return -ENOMEM;46 47 snprintf(button->phys, sizeof(button->phys), "%s/input0", acpi_device_hid(device));48 49 button->input_dev->name = "Wireless hotkeys";50 button->input_dev->phys = button->phys;51 button->input_dev->id.bustype = BUS_HOST;52 button->input_dev->evbit[0] = BIT(EV_KEY);53 set_bit(KEY_RFKILL, button->input_dev->keybit);54 55 err = input_register_device(button->input_dev);56 if (err)57 goto err_free_dev;58 59 return 0;60 61err_free_dev:62 input_free_device(button->input_dev);63 return err;64}65 66static void wireless_input_destroy(struct acpi_device *device)67{68 struct wl_button *button = acpi_driver_data(device);69 70 input_unregister_device(button->input_dev);71 kfree(button);72}73 74static void wl_notify(struct acpi_device *acpi_dev, u32 event)75{76 struct wl_button *button = acpi_driver_data(acpi_dev);77 78 if (event != 0x80) {79 pr_info("Received unknown event (0x%x)\n", event);80 return;81 }82 83 input_report_key(button->input_dev, KEY_RFKILL, 1);84 input_sync(button->input_dev);85 input_report_key(button->input_dev, KEY_RFKILL, 0);86 input_sync(button->input_dev);87}88 89static int wl_add(struct acpi_device *device)90{91 struct wl_button *button;92 int err;93 94 button = kzalloc(sizeof(struct wl_button), GFP_KERNEL);95 if (!button)96 return -ENOMEM;97 98 device->driver_data = button;99 100 err = wireless_input_setup(device);101 if (err) {102 pr_err("Failed to setup wireless hotkeys\n");103 kfree(button);104 }105 106 return err;107}108 109static void wl_remove(struct acpi_device *device)110{111 wireless_input_destroy(device);112}113 114static struct acpi_driver wl_driver = {115 .name = "wireless-hotkey",116 .ids = wl_ids,117 .ops = {118 .add = wl_add,119 .remove = wl_remove,120 .notify = wl_notify,121 },122};123 124module_acpi_driver(wl_driver);125