1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * WMI Thunderbolt driver 4 * 5 * Copyright (C) 2017 Dell Inc. All Rights Reserved. 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/device.h> 11 #include <linux/fs.h> 12 #include <linux/hex.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 22 static ssize_t force_power_store(struct device *dev, 23 struct device_attribute *attr, 24 const char *buf, size_t count) 25 { 26 struct wmi_buffer buffer; 27 int ret; 28 u8 mode; 29 30 buffer.length = sizeof(mode); 31 buffer.data = &mode; 32 33 mode = hex_to_bin(buf[0]); 34 if (mode > 1) 35 return -EINVAL; 36 37 ret = wmidev_invoke_method(to_wmi_device(dev), 0, 1, &buffer, NULL); 38 if (ret < 0) 39 return ret; 40 41 return count; 42 } 43 44 static DEVICE_ATTR_WO(force_power); 45 46 static struct attribute *tbt_attrs[] = { 47 &dev_attr_force_power.attr, 48 NULL 49 }; 50 ATTRIBUTE_GROUPS(tbt); 51 52 static const struct wmi_device_id intel_wmi_thunderbolt_id_table[] = { 53 { .guid_string = INTEL_WMI_THUNDERBOLT_GUID }, 54 { }, 55 }; 56 57 static struct wmi_driver intel_wmi_thunderbolt_driver = { 58 .driver = { 59 .name = "intel-wmi-thunderbolt", 60 .dev_groups = tbt_groups, 61 }, 62 .id_table = intel_wmi_thunderbolt_id_table, 63 .no_singleton = true, 64 }; 65 66 module_wmi_driver(intel_wmi_thunderbolt_driver); 67 68 MODULE_DEVICE_TABLE(wmi, intel_wmi_thunderbolt_id_table); 69 MODULE_AUTHOR("Mario Limonciello <mario.limonciello@dell.com>"); 70 MODULE_DESCRIPTION("Intel WMI Thunderbolt force power driver"); 71 MODULE_LICENSE("GPL v2"); 72