platform/x86/xiaomi-wmi.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /* WMI driver for Xiaomi Laptops */
0003
0004 #include <linux/acpi.h>
0005 #include <linux/input.h>
0006 #include <linux/module.h>
0007 #include <linux/wmi.h>
0008
0009 #include <uapi/linux/input-event-codes.h>
0010
0011 #define XIAOMI_KEY_FN_ESC_0 "A2095CCE-0491-44E7-BA27-F8ED8F88AA86"
0012 #define XIAOMI_KEY_FN_ESC_1 "7BBE8E39-B486-473D-BA13-66F75C5805CD"
0013 #define XIAOMI_KEY_FN_FN    "409B028D-F06B-4C7C-8BBB-EE133A6BD87E"
0014 #define XIAOMI_KEY_CAPSLOCK "83FE7607-053A-4644-822A-21532C621FC7"
0015 #define XIAOMI_KEY_FN_F7    "76E9027C-95D0-4180-8692-DA6747DD1C2D"
0016
0017 #define XIAOMI_DEVICE(guid, key)        \
0018     .guid_string = (guid),          \
0019     .context = &(const unsigned int){key}
0020
0021 struct xiaomi_wmi {
0022     struct input_dev *input_dev;
0023     unsigned int key_code;
0024 };
0025
0026 static int xiaomi_wmi_probe(struct wmi_device *wdev, const void *context)
0027 {
0028     struct xiaomi_wmi *data;
0029
0030     if (wdev == NULL || context == NULL)
0031         return -EINVAL;
0032
0033     data = devm_kzalloc(&wdev->dev, sizeof(struct xiaomi_wmi), GFP_KERNEL);
0034     if (data == NULL)
0035         return -ENOMEM;
0036     dev_set_drvdata(&wdev->dev, data);
0037
0038     data->input_dev = devm_input_allocate_device(&wdev->dev);
0039     if (data->input_dev == NULL)
0040         return -ENOMEM;
0041     data->input_dev->name = "Xiaomi WMI keys";
0042     data->input_dev->phys = "wmi/input0";
0043
0044     data->key_code = *((const unsigned int *)context);
0045     set_bit(EV_KEY, data->input_dev->evbit);
0046     set_bit(data->key_code, data->input_dev->keybit);
0047
0048     return input_register_device(data->input_dev);
0049 }
0050
0051 static void xiaomi_wmi_notify(struct wmi_device *wdev, union acpi_object *dummy)
0052 {
0053     struct xiaomi_wmi *data;
0054
0055     if (wdev == NULL)
0056         return;
0057
0058     data = dev_get_drvdata(&wdev->dev);
0059     if (data == NULL)
0060         return;
0061
0062     input_report_key(data->input_dev, data->key_code, 1);
0063     input_sync(data->input_dev);
0064     input_report_key(data->input_dev, data->key_code, 0);
0065     input_sync(data->input_dev);
0066 }
0067
0068 static const struct wmi_device_id xiaomi_wmi_id_table[] = {
0069     // { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_0, KEY_FN_ESC) },
0070     // { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_1, KEY_FN_ESC) },
0071     { XIAOMI_DEVICE(XIAOMI_KEY_FN_FN, KEY_PROG1) },
0072     // { XIAOMI_DEVICE(XIAOMI_KEY_CAPSLOCK, KEY_CAPSLOCK) },
0073     { XIAOMI_DEVICE(XIAOMI_KEY_FN_F7, KEY_CUT) },
0074
0075     /* Terminating entry */
0076     { }
0077 };
0078
0079 static struct wmi_driver xiaomi_wmi_driver = {
0080     .driver = {
0081         .name = "xiaomi-wmi",
0082     },
0083     .id_table = xiaomi_wmi_id_table,
0084     .probe = xiaomi_wmi_probe,
0085     .notify = xiaomi_wmi_notify,
0086 };
0087 module_wmi_driver(xiaomi_wmi_driver);
0088
0089 MODULE_DEVICE_TABLE(wmi, xiaomi_wmi_id_table);
0090 MODULE_AUTHOR("Mattias Jacobsson");
0091 MODULE_DESCRIPTION("Xiaomi WMI driver");
0092 MODULE_LICENSE("GPL v2");