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