1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * WMI Thunderbolt driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2017 Dell Inc. All Rights Reserved.
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/acpi.h>
11*4882a593Smuzhiyun #include <linux/device.h>
12*4882a593Smuzhiyun #include <linux/fs.h>
13*4882a593Smuzhiyun #include <linux/kernel.h>
14*4882a593Smuzhiyun #include <linux/module.h>
15*4882a593Smuzhiyun #include <linux/string.h>
16*4882a593Smuzhiyun #include <linux/sysfs.h>
17*4882a593Smuzhiyun #include <linux/types.h>
18*4882a593Smuzhiyun #include <linux/wmi.h>
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun #define INTEL_WMI_THUNDERBOLT_GUID "86CCFD48-205E-4A77-9C48-2021CBEDE341"
21*4882a593Smuzhiyun
force_power_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)22*4882a593Smuzhiyun static ssize_t force_power_store(struct device *dev,
23*4882a593Smuzhiyun struct device_attribute *attr,
24*4882a593Smuzhiyun const char *buf, size_t count)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun struct acpi_buffer input;
27*4882a593Smuzhiyun acpi_status status;
28*4882a593Smuzhiyun u8 mode;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun input.length = sizeof(u8);
31*4882a593Smuzhiyun input.pointer = &mode;
32*4882a593Smuzhiyun mode = hex_to_bin(buf[0]);
33*4882a593Smuzhiyun dev_dbg(dev, "force_power: storing %#x\n", mode);
34*4882a593Smuzhiyun if (mode == 0 || mode == 1) {
35*4882a593Smuzhiyun status = wmi_evaluate_method(INTEL_WMI_THUNDERBOLT_GUID, 0, 1,
36*4882a593Smuzhiyun &input, NULL);
37*4882a593Smuzhiyun if (ACPI_FAILURE(status)) {
38*4882a593Smuzhiyun dev_dbg(dev, "force_power: failed to evaluate ACPI method\n");
39*4882a593Smuzhiyun return -ENODEV;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun } else {
42*4882a593Smuzhiyun dev_dbg(dev, "force_power: unsupported mode\n");
43*4882a593Smuzhiyun return -EINVAL;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun return count;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun static DEVICE_ATTR_WO(force_power);
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun static struct attribute *tbt_attrs[] = {
51*4882a593Smuzhiyun &dev_attr_force_power.attr,
52*4882a593Smuzhiyun NULL
53*4882a593Smuzhiyun };
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun static const struct attribute_group tbt_attribute_group = {
56*4882a593Smuzhiyun .attrs = tbt_attrs,
57*4882a593Smuzhiyun };
58*4882a593Smuzhiyun
intel_wmi_thunderbolt_probe(struct wmi_device * wdev,const void * context)59*4882a593Smuzhiyun static int intel_wmi_thunderbolt_probe(struct wmi_device *wdev,
60*4882a593Smuzhiyun const void *context)
61*4882a593Smuzhiyun {
62*4882a593Smuzhiyun int ret;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun ret = sysfs_create_group(&wdev->dev.kobj, &tbt_attribute_group);
65*4882a593Smuzhiyun kobject_uevent(&wdev->dev.kobj, KOBJ_CHANGE);
66*4882a593Smuzhiyun return ret;
67*4882a593Smuzhiyun }
68*4882a593Smuzhiyun
intel_wmi_thunderbolt_remove(struct wmi_device * wdev)69*4882a593Smuzhiyun static int intel_wmi_thunderbolt_remove(struct wmi_device *wdev)
70*4882a593Smuzhiyun {
71*4882a593Smuzhiyun sysfs_remove_group(&wdev->dev.kobj, &tbt_attribute_group);
72*4882a593Smuzhiyun kobject_uevent(&wdev->dev.kobj, KOBJ_CHANGE);
73*4882a593Smuzhiyun return 0;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun static const struct wmi_device_id intel_wmi_thunderbolt_id_table[] = {
77*4882a593Smuzhiyun { .guid_string = INTEL_WMI_THUNDERBOLT_GUID },
78*4882a593Smuzhiyun { },
79*4882a593Smuzhiyun };
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun static struct wmi_driver intel_wmi_thunderbolt_driver = {
82*4882a593Smuzhiyun .driver = {
83*4882a593Smuzhiyun .name = "intel-wmi-thunderbolt",
84*4882a593Smuzhiyun },
85*4882a593Smuzhiyun .probe = intel_wmi_thunderbolt_probe,
86*4882a593Smuzhiyun .remove = intel_wmi_thunderbolt_remove,
87*4882a593Smuzhiyun .id_table = intel_wmi_thunderbolt_id_table,
88*4882a593Smuzhiyun };
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun module_wmi_driver(intel_wmi_thunderbolt_driver);
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun MODULE_DEVICE_TABLE(wmi, intel_wmi_thunderbolt_id_table);
93*4882a593Smuzhiyun MODULE_AUTHOR("Mario Limonciello <mario.limonciello@dell.com>");
94*4882a593Smuzhiyun MODULE_DESCRIPTION("Intel WMI Thunderbolt force power driver");
95*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
96