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1// SPDX-License-Identifier: GPL-2.02/*3 * WMI Thunderbolt driver4 *5 * Copyright (C) 2017 Dell Inc. All Rights Reserved.6 */7 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt9 10#include <linux/acpi.h>11#include <linux/device.h>12#include <linux/fs.h>13#include <linux/kernel.h>14#include <linux/module.h>15#include <linux/string.h>16#include <linux/sysfs.h>17#include <linux/types.h>18#include <linux/wmi.h>19 20#define INTEL_WMI_THUNDERBOLT_GUID "86CCFD48-205E-4A77-9C48-2021CBEDE341"21 22static ssize_t force_power_store(struct device *dev,23 struct device_attribute *attr,24 const char *buf, size_t count)25{26 struct acpi_buffer input;27 acpi_status status;28 u8 mode;29 30 input.length = sizeof(u8);31 input.pointer = &mode;32 mode = hex_to_bin(buf[0]);33 dev_dbg(dev, "force_power: storing %#x\n", mode);34 if (mode == 0 || mode == 1) {35 status = wmidev_evaluate_method(to_wmi_device(dev), 0, 1, &input, NULL);36 if (ACPI_FAILURE(status)) {37 dev_dbg(dev, "force_power: failed to evaluate ACPI method\n");38 return -ENODEV;39 }40 } else {41 dev_dbg(dev, "force_power: unsupported mode\n");42 return -EINVAL;43 }44 return count;45}46 47static DEVICE_ATTR_WO(force_power);48 49static struct attribute *tbt_attrs[] = {50 &dev_attr_force_power.attr,51 NULL52};53ATTRIBUTE_GROUPS(tbt);54 55static const struct wmi_device_id intel_wmi_thunderbolt_id_table[] = {56 { .guid_string = INTEL_WMI_THUNDERBOLT_GUID },57 { },58};59 60static struct wmi_driver intel_wmi_thunderbolt_driver = {61 .driver = {62 .name = "intel-wmi-thunderbolt",63 .dev_groups = tbt_groups,64 },65 .id_table = intel_wmi_thunderbolt_id_table,66 .no_singleton = true,67};68 69module_wmi_driver(intel_wmi_thunderbolt_driver);70 71MODULE_DEVICE_TABLE(wmi, intel_wmi_thunderbolt_id_table);72MODULE_AUTHOR("Mario Limonciello <mario.limonciello@dell.com>");73MODULE_DESCRIPTION("Intel WMI Thunderbolt force power driver");74MODULE_LICENSE("GPL v2");75