| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* |
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| 3 | * WMI Thunderbolt driver |
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| 4 | * |
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| 5 | * Copyright (C) 2017 Dell Inc. All Rights Reserved. |
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| 6 | */ |
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| 7 | |
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| 8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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| 9 | |
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| 10 | #include <linux/acpi.h> |
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| 11 | #include <linux/device.h> |
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| 12 | #include <linux/fs.h> |
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| 13 | #include <linux/kernel.h> |
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| 14 | #include <linux/module.h> |
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| 15 | #include <linux/string.h> |
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| 16 | #include <linux/sysfs.h> |
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| 17 | #include <linux/types.h> |
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| 18 | #include <linux/wmi.h> |
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| 19 | |
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| 20 | #define INTEL_WMI_THUNDERBOLT_GUID "86CCFD48-205E-4A77-9C48-2021CBEDE341" |
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| 21 | |
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| 22 | static ssize_t force_power_store(struct device *dev, |
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| 23 | struct device_attribute *attr, |
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| 24 | const char *buf, size_t count) |
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| 25 | { |
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| 26 | struct acpi_buffer input; |
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| 27 | acpi_status status; |
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| 28 | u8 mode; |
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| 29 | |
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| 30 | input.length = sizeof(u8); |
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| 31 | input.pointer = &mode; |
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| 32 | mode = hex_to_bin(ch: buf[0]); |
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| 33 | dev_dbg(dev, "force_power: storing %#x\n" , mode); |
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| 34 | if (mode == 0 || mode == 1) { |
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| 35 | status = wmidev_evaluate_method(to_wmi_device(dev), instance: 0, method_id: 1, in: &input, NULL); |
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| 36 | if (ACPI_FAILURE(status)) { |
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| 37 | dev_dbg(dev, "force_power: failed to evaluate ACPI method\n" ); |
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| 38 | return -ENODEV; |
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| 39 | } |
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| 40 | } else { |
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| 41 | dev_dbg(dev, "force_power: unsupported mode\n" ); |
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| 42 | return -EINVAL; |
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| 43 | } |
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| 44 | return count; |
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| 45 | } |
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| 46 | |
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| 47 | static DEVICE_ATTR_WO(force_power); |
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| 48 | |
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| 49 | static struct attribute *tbt_attrs[] = { |
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| 50 | &dev_attr_force_power.attr, |
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| 51 | NULL |
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| 52 | }; |
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| 53 | ATTRIBUTE_GROUPS(tbt); |
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| 54 | |
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| 55 | static const struct wmi_device_id intel_wmi_thunderbolt_id_table[] = { |
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| 56 | { .guid_string = INTEL_WMI_THUNDERBOLT_GUID }, |
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| 57 | { }, |
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| 58 | }; |
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| 59 | |
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| 60 | static struct wmi_driver intel_wmi_thunderbolt_driver = { |
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| 61 | .driver = { |
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| 62 | .name = "intel-wmi-thunderbolt" , |
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| 63 | .dev_groups = tbt_groups, |
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| 64 | }, |
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| 65 | .id_table = intel_wmi_thunderbolt_id_table, |
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| 66 | .no_singleton = true, |
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| 67 | }; |
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| 68 | |
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| 69 | module_wmi_driver(intel_wmi_thunderbolt_driver); |
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| 70 | |
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| 71 | MODULE_DEVICE_TABLE(wmi, intel_wmi_thunderbolt_id_table); |
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| 72 | MODULE_AUTHOR("Mario Limonciello <mario.limonciello@dell.com>" ); |
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| 73 | MODULE_DESCRIPTION("Intel WMI Thunderbolt force power driver" ); |
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| 74 | MODULE_LICENSE("GPL v2" ); |
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| 75 | |
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