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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Linux hotkey driver for Uniwill notebooks.
*
* Special thanks go to Pőcze Barnabás, Christoffer Sandberg and Werner Sembach
* for supporting the development of this driver either through prior work or
* by answering questions regarding the underlying WMI interface.
*
* Copyright (C) 2025 Armin Wolf <W_Armin@gmx.de>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/mod_devicetable.h>
#include <linux/notifier.h>
#include <linux/printk.h>
#include <linux/types.h>
#include <linux/wmi.h>
#include "uniwill-wmi.h"
#define DRIVER_NAME "uniwill-wmi"
#define UNIWILL_EVENT_GUID "ABBC0F72-8EA1-11D1-00A0-C90629100000"
static BLOCKING_NOTIFIER_HEAD(uniwill_wmi_chain_head);
static void devm_uniwill_wmi_unregister_notifier(void *data)
{
struct notifier_block *nb = data;
blocking_notifier_chain_unregister(&uniwill_wmi_chain_head, nb);
}
int devm_uniwill_wmi_register_notifier(struct device *dev, struct notifier_block *nb)
{
int ret;
ret = blocking_notifier_chain_register(&uniwill_wmi_chain_head, nb);
if (ret < 0)
return ret;
return devm_add_action_or_reset(dev, devm_uniwill_wmi_unregister_notifier, nb);
}
static void uniwill_wmi_notify(struct wmi_device *wdev, union acpi_object *obj)
{
u32 value;
if (obj->type != ACPI_TYPE_INTEGER)
return;
value = obj->integer.value;
dev_dbg(&wdev->dev, "Received WMI event %u\n", value);
blocking_notifier_call_chain(&uniwill_wmi_chain_head, value, NULL);
}
/*
* We cannot fully trust this GUID since Uniwill just copied the WMI GUID
* from the Windows driver example, and others probably did the same.
*
* Because of this we cannot use this WMI GUID for autoloading. Instead the
* associated driver will be registered manually after matching a DMI table.
*/
static const struct wmi_device_id uniwill_wmi_id_table[] = {
{ UNIWILL_EVENT_GUID, NULL },
{ }
};
static struct wmi_driver uniwill_wmi_driver = {
.driver = {
.name = DRIVER_NAME,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.id_table = uniwill_wmi_id_table,
.notify = uniwill_wmi_notify,
.no_singleton = true,
};
int __init uniwill_wmi_register_driver(void)
{
return wmi_driver_register(&uniwill_wmi_driver);
}
void __exit uniwill_wmi_unregister_driver(void)
{
wmi_driver_unregister(&uniwill_wmi_driver);
}
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