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1// SPDX-License-Identifier: GPL-2.02/* WMI driver for Xiaomi Laptops */3 4#include <linux/acpi.h>5#include <linux/device.h>6#include <linux/input.h>7#include <linux/module.h>8#include <linux/mutex.h>9#include <linux/wmi.h>10 11#include <uapi/linux/input-event-codes.h>12 13#define XIAOMI_KEY_FN_ESC_0 "A2095CCE-0491-44E7-BA27-F8ED8F88AA86"14#define XIAOMI_KEY_FN_ESC_1 "7BBE8E39-B486-473D-BA13-66F75C5805CD"15#define XIAOMI_KEY_FN_FN "409B028D-F06B-4C7C-8BBB-EE133A6BD87E"16#define XIAOMI_KEY_CAPSLOCK "83FE7607-053A-4644-822A-21532C621FC7"17#define XIAOMI_KEY_FN_F7 "76E9027C-95D0-4180-8692-DA6747DD1C2D"18 19#define XIAOMI_DEVICE(guid, key) \20 .guid_string = (guid), \21 .context = &(const unsigned int){key}22 23struct xiaomi_wmi {24 struct input_dev *input_dev;25 struct mutex key_lock; /* Protects the key event sequence */26 unsigned int key_code;27};28 29static void xiaomi_mutex_destroy(void *data)30{31 struct mutex *lock = data;32 33 mutex_destroy(lock);34}35 36static int xiaomi_wmi_probe(struct wmi_device *wdev, const void *context)37{38 struct xiaomi_wmi *data;39 int ret;40 41 if (!context)42 return -EINVAL;43 44 data = devm_kzalloc(&wdev->dev, sizeof(struct xiaomi_wmi), GFP_KERNEL);45 if (data == NULL)46 return -ENOMEM;47 dev_set_drvdata(&wdev->dev, data);48 49 mutex_init(&data->key_lock);50 ret = devm_add_action_or_reset(&wdev->dev, xiaomi_mutex_destroy, &data->key_lock);51 if (ret < 0)52 return ret;53 54 data->input_dev = devm_input_allocate_device(&wdev->dev);55 if (data->input_dev == NULL)56 return -ENOMEM;57 data->input_dev->name = "Xiaomi WMI keys";58 data->input_dev->phys = "wmi/input0";59 60 data->key_code = *((const unsigned int *)context);61 set_bit(EV_KEY, data->input_dev->evbit);62 set_bit(data->key_code, data->input_dev->keybit);63 64 return input_register_device(data->input_dev);65}66 67static void xiaomi_wmi_notify(struct wmi_device *wdev, union acpi_object *dummy)68{69 struct xiaomi_wmi *data = dev_get_drvdata(&wdev->dev);70 71 mutex_lock(&data->key_lock);72 input_report_key(data->input_dev, data->key_code, 1);73 input_sync(data->input_dev);74 input_report_key(data->input_dev, data->key_code, 0);75 input_sync(data->input_dev);76 mutex_unlock(&data->key_lock);77}78 79static const struct wmi_device_id xiaomi_wmi_id_table[] = {80 // { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_0, KEY_FN_ESC) },81 // { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_1, KEY_FN_ESC) },82 { XIAOMI_DEVICE(XIAOMI_KEY_FN_FN, KEY_PROG1) },83 // { XIAOMI_DEVICE(XIAOMI_KEY_CAPSLOCK, KEY_CAPSLOCK) },84 { XIAOMI_DEVICE(XIAOMI_KEY_FN_F7, KEY_CUT) },85 86 /* Terminating entry */87 { }88};89 90static struct wmi_driver xiaomi_wmi_driver = {91 .driver = {92 .name = "xiaomi-wmi",93 },94 .id_table = xiaomi_wmi_id_table,95 .probe = xiaomi_wmi_probe,96 .notify = xiaomi_wmi_notify,97 .no_singleton = true,98};99module_wmi_driver(xiaomi_wmi_driver);100 101MODULE_DEVICE_TABLE(wmi, xiaomi_wmi_id_table);102MODULE_AUTHOR("Mattias Jacobsson");103MODULE_DESCRIPTION("Xiaomi WMI driver");104MODULE_LICENSE("GPL v2");105