// SPDX-License-Identifier: GPL-2.0
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/*
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* WMI Thunderbolt driver
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*
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* Copyright (C) 2017 Dell Inc. All Rights Reserved.
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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/fs.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/sysfs.h>
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#include <linux/types.h>
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#include <linux/wmi.h>
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#define INTEL_WMI_THUNDERBOLT_GUID "86CCFD48-205E-4A77-9C48-2021CBEDE341"
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static ssize_t force_power_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct acpi_buffer input;
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acpi_status status;
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u8 mode;
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input.length = sizeof(u8);
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input.pointer = &mode;
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mode = hex_to_bin(buf[0]);
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dev_dbg(dev, "force_power: storing %#x\n", mode);
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if (mode == 0 || mode == 1) {
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status = wmi_evaluate_method(INTEL_WMI_THUNDERBOLT_GUID, 0, 1,
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&input, NULL);
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if (ACPI_FAILURE(status)) {
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dev_dbg(dev, "force_power: failed to evaluate ACPI method\n");
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return -ENODEV;
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}
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} else {
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dev_dbg(dev, "force_power: unsupported mode\n");
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return -EINVAL;
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}
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return count;
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}
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static DEVICE_ATTR_WO(force_power);
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static struct attribute *tbt_attrs[] = {
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&dev_attr_force_power.attr,
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NULL
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};
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static const struct attribute_group tbt_attribute_group = {
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.attrs = tbt_attrs,
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};
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static int intel_wmi_thunderbolt_probe(struct wmi_device *wdev,
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const void *context)
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{
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int ret;
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ret = sysfs_create_group(&wdev->dev.kobj, &tbt_attribute_group);
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kobject_uevent(&wdev->dev.kobj, KOBJ_CHANGE);
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return ret;
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}
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static int intel_wmi_thunderbolt_remove(struct wmi_device *wdev)
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{
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sysfs_remove_group(&wdev->dev.kobj, &tbt_attribute_group);
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kobject_uevent(&wdev->dev.kobj, KOBJ_CHANGE);
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return 0;
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}
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static const struct wmi_device_id intel_wmi_thunderbolt_id_table[] = {
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{ .guid_string = INTEL_WMI_THUNDERBOLT_GUID },
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{ },
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};
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static struct wmi_driver intel_wmi_thunderbolt_driver = {
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.driver = {
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.name = "intel-wmi-thunderbolt",
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},
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.probe = intel_wmi_thunderbolt_probe,
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.remove = intel_wmi_thunderbolt_remove,
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.id_table = intel_wmi_thunderbolt_id_table,
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};
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module_wmi_driver(intel_wmi_thunderbolt_driver);
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MODULE_DEVICE_TABLE(wmi, intel_wmi_thunderbolt_id_table);
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MODULE_AUTHOR("Mario Limonciello <mario.limonciello@dell.com>");
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MODULE_DESCRIPTION("Intel WMI Thunderbolt force power driver");
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MODULE_LICENSE("GPL v2");
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