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d050479693
Add a new driver for Uniwill laptops. The driver uses a ACPI interface to talk with the embedded controller, but relies on a ACPI WMI interface for receiving event notifications. The driver is reverse-engineered based on the following information: - OEM software from intel - https://github.com/pobrn/qc71_laptop - https://gitlab.com/tuxedocomputers/development/packages/tuxedo-drivers - https://github.com/tuxedocomputers/tuxedo-control-center The underlying EC supports various features, including hwmon sensors, battery charge limiting, a RGB lightbar and keyboard-related controls. Reported-by: cyear <chumuzero@gmail.com> Closes: https://github.com/lm-sensors/lm-sensors/issues/508 Closes: https://github.com/Wer-Wolf/uniwill-laptop/issues/3 Tested-by: Werner Sembach <wse@tuxedocomputers.com> Signed-off-by: Armin Wolf <W_Armin@gmx.de> Link: https://patch.msgid.link/20251102172942.17879-2-W_Armin@gmx.de Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Linux hotkey driver for Uniwill notebooks.
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*
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* Special thanks go to Pőcze Barnabás, Christoffer Sandberg and Werner Sembach
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* for supporting the development of this driver either through prior work or
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* by answering questions regarding the underlying WMI interface.
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*
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* Copyright (C) 2025 Armin Wolf <W_Armin@gmx.de>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/mod_devicetable.h>
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#include <linux/notifier.h>
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#include <linux/printk.h>
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#include <linux/types.h>
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#include <linux/wmi.h>
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#include "uniwill-wmi.h"
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#define DRIVER_NAME "uniwill-wmi"
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#define UNIWILL_EVENT_GUID "ABBC0F72-8EA1-11D1-00A0-C90629100000"
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static BLOCKING_NOTIFIER_HEAD(uniwill_wmi_chain_head);
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static void devm_uniwill_wmi_unregister_notifier(void *data)
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{
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struct notifier_block *nb = data;
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blocking_notifier_chain_unregister(&uniwill_wmi_chain_head, nb);
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}
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int devm_uniwill_wmi_register_notifier(struct device *dev, struct notifier_block *nb)
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{
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int ret;
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ret = blocking_notifier_chain_register(&uniwill_wmi_chain_head, nb);
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if (ret < 0)
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return ret;
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return devm_add_action_or_reset(dev, devm_uniwill_wmi_unregister_notifier, nb);
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}
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static void uniwill_wmi_notify(struct wmi_device *wdev, union acpi_object *obj)
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{
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u32 value;
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if (obj->type != ACPI_TYPE_INTEGER)
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return;
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value = obj->integer.value;
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dev_dbg(&wdev->dev, "Received WMI event %u\n", value);
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blocking_notifier_call_chain(&uniwill_wmi_chain_head, value, NULL);
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}
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/*
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* We cannot fully trust this GUID since Uniwill just copied the WMI GUID
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* from the Windows driver example, and others probably did the same.
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*
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* Because of this we cannot use this WMI GUID for autoloading. Instead the
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* associated driver will be registered manually after matching a DMI table.
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*/
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static const struct wmi_device_id uniwill_wmi_id_table[] = {
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{ UNIWILL_EVENT_GUID, NULL },
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{ }
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};
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static struct wmi_driver uniwill_wmi_driver = {
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.driver = {
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.name = DRIVER_NAME,
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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},
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.id_table = uniwill_wmi_id_table,
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.notify = uniwill_wmi_notify,
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.no_singleton = true,
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};
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int __init uniwill_wmi_register_driver(void)
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{
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return wmi_driver_register(&uniwill_wmi_driver);
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}
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void __exit uniwill_wmi_unregister_driver(void)
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{
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wmi_driver_unregister(&uniwill_wmi_driver);
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}
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