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94 lines
2.3 KiB
94 lines
2.3 KiB
// 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 void 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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} |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Intel WMI Thunderbolt force power driver"); |
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MODULE_LICENSE("GPL v2");
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