drivers/platform/x86/xiaomi-wmi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* WMI driver for Xiaomi Laptops */
   3
   4 #include <linux/acpi.h>
   5 #include <linux/input.h>
   6 #include <linux/module.h>
   7 #include <linux/wmi.h>
   8
   9 #include <uapi/linux/input-event-codes.h>
  10
  11 #define XIAOMI_KEY_FN_ESC_0     "A2095CCE-0491-44E7-BA27-F8ED8F88AA86"
  12 #define XIAOMI_KEY_FN_ESC_1     "7BBE8E39-B486-473D-BA13-66F75C5805CD"
  13 #define XIAOMI_KEY_FN_FN        "409B028D-F06B-4C7C-8BBB-EE133A6BD87E"
  14 #define XIAOMI_KEY_CAPSLOCK     "83FE7607-053A-4644-822A-21532C621FC7"
  15 #define XIAOMI_KEY_FN_F7        "76E9027C-95D0-4180-8692-DA6747DD1C2D"
  16
  17 #define XIAOMI_DEVICE(guid, key)                \
  18         .guid_string = (guid),                  \
  19         .context = &(const unsigned int){key}
  20
  21 struct xiaomi_wmi {
  22         struct input_dev *input_dev;
  23         unsigned int key_code;
  24 };
  25
  26 int xiaomi_wmi_probe(struct wmi_device *wdev, const void *context)
  27 {
  28         struct xiaomi_wmi *data;
  29
  30         if (wdev == NULL || context == NULL)
  31                 return -EINVAL;
  32
  33         data = devm_kzalloc(&wdev->dev, sizeof(struct xiaomi_wmi), GFP_KERNEL);
  34         if (data == NULL)
  35                 return -ENOMEM;
  36         dev_set_drvdata(&wdev->dev, data);
  37
  38         data->input_dev = devm_input_allocate_device(&wdev->dev);
  39         if (data->input_dev == NULL)
  40                 return -ENOMEM;
  41         data->input_dev->name = "Xiaomi WMI keys";
  42         data->input_dev->phys = "wmi/input0";
  43
  44         data->key_code = *((const unsigned int *)context);
  45         set_bit(EV_KEY, data->input_dev->evbit);
  46         set_bit(data->key_code, data->input_dev->keybit);
  47
  48         return input_register_device(data->input_dev);
  49 }
  50
  51 void xiaomi_wmi_notify(struct wmi_device *wdev, union acpi_object *dummy)
  52 {
  53         struct xiaomi_wmi *data;
  54
  55         if (wdev == NULL)
  56                 return;
  57
  58         data = dev_get_drvdata(&wdev->dev);
  59         if (data == NULL)
  60                 return;
  61
  62         input_report_key(data->input_dev, data->key_code, 1);
  63         input_sync(data->input_dev);
  64         input_report_key(data->input_dev, data->key_code, 0);
  65         input_sync(data->input_dev);
  66 }
  67
  68 static const struct wmi_device_id xiaomi_wmi_id_table[] = {
  69         // { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_0, KEY_FN_ESC) },
  70         // { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_1, KEY_FN_ESC) },
  71         { XIAOMI_DEVICE(XIAOMI_KEY_FN_FN, KEY_PROG1) },
  72         // { XIAOMI_DEVICE(XIAOMI_KEY_CAPSLOCK, KEY_CAPSLOCK) },
  73         { XIAOMI_DEVICE(XIAOMI_KEY_FN_F7, KEY_CUT) },
  74
  75         /* Terminating entry */
  76         { }
  77 };
  78
  79 static struct wmi_driver xiaomi_wmi_driver = {
  80         .driver = {
  81                 .name = "xiaomi-wmi",
  82         },
  83         .id_table = xiaomi_wmi_id_table,
  84         .probe = xiaomi_wmi_probe,
  85         .notify = xiaomi_wmi_notify,
  86 };
  87 module_wmi_driver(xiaomi_wmi_driver);
  88
  89 MODULE_DEVICE_TABLE(wmi, xiaomi_wmi_id_table);
  90 MODULE_AUTHOR("Mattias Jacobsson");
  91 MODULE_DESCRIPTION("Xiaomi WMI driver");
  92 MODULE_LICENSE("GPL v2");