// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Airplane mode button for HP & Xiaomi laptops
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*
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* Copyright (C) 2014-2017 Alex Hung <alex.hung@canonical.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/platform_device.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_bus.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Alex Hung");
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MODULE_ALIAS("acpi*:HPQ6001:*");
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MODULE_ALIAS("acpi*:WSTADEF:*");
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MODULE_ALIAS("acpi*:AMDI0051:*");
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static struct input_dev *hpwl_input_dev;
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static const struct acpi_device_id hpwl_ids[] = {
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{"HPQ6001", 0},
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{"WSTADEF", 0},
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{"AMDI0051", 0},
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{"", 0},
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};
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static int hp_wireless_input_setup(void)
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{
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int err;
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hpwl_input_dev = input_allocate_device();
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if (!hpwl_input_dev)
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return -ENOMEM;
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hpwl_input_dev->name = "HP Wireless hotkeys";
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hpwl_input_dev->phys = "hpq6001/input0";
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hpwl_input_dev->id.bustype = BUS_HOST;
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hpwl_input_dev->evbit[0] = BIT(EV_KEY);
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set_bit(KEY_RFKILL, hpwl_input_dev->keybit);
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err = input_register_device(hpwl_input_dev);
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if (err)
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goto err_free_dev;
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return 0;
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err_free_dev:
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input_free_device(hpwl_input_dev);
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return err;
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}
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static void hp_wireless_input_destroy(void)
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{
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input_unregister_device(hpwl_input_dev);
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}
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static void hpwl_notify(struct acpi_device *acpi_dev, u32 event)
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{
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if (event != 0x80) {
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pr_info("Received unknown event (0x%x)\n", event);
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return;
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}
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input_report_key(hpwl_input_dev, KEY_RFKILL, 1);
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input_sync(hpwl_input_dev);
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input_report_key(hpwl_input_dev, KEY_RFKILL, 0);
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input_sync(hpwl_input_dev);
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}
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static int hpwl_add(struct acpi_device *device)
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{
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int err;
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err = hp_wireless_input_setup();
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if (err)
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pr_err("Failed to setup hp wireless hotkeys\n");
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return err;
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}
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static int hpwl_remove(struct acpi_device *device)
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{
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hp_wireless_input_destroy();
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return 0;
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}
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static struct acpi_driver hpwl_driver = {
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.name = "hp-wireless",
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.owner = THIS_MODULE,
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.ids = hpwl_ids,
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.ops = {
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.add = hpwl_add,
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.remove = hpwl_remove,
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.notify = hpwl_notify,
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},
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};
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module_acpi_driver(hpwl_driver);
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