| // 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, |
| const void *context) |
| { |
| int ret; |
| |
| ret = sysfs_create_group(&wdev->dev.kobj, &tbt_attribute_group); |
| kobject_uevent(&wdev->dev.kobj, KOBJ_CHANGE); |
| return ret; |
| } |
| |
| static void intel_wmi_thunderbolt_remove(struct wmi_device *wdev) |
| { |
| sysfs_remove_group(&wdev->dev.kobj, &tbt_attribute_group); |
| kobject_uevent(&wdev->dev.kobj, KOBJ_CHANGE); |
| } |
| |
| 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_DEVICE_TABLE(wmi, intel_wmi_thunderbolt_id_table); |
| MODULE_AUTHOR("Mario Limonciello <mario.limonciello@dell.com>"); |
| MODULE_DESCRIPTION("Intel WMI Thunderbolt force power driver"); |
| MODULE_LICENSE("GPL v2"); |