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