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// 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");
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