LXR linux/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
  21struct xiaomi_wmi {
  22        struct input_dev *input_dev;
  23        unsigned int key_code;
  24};
  25
  26int 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
  51void 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
  68static 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
  79static 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};
  87module_wmi_driver(xiaomi_wmi_driver);
  88
  89MODULE_DEVICE_TABLE(wmi, xiaomi_wmi_id_table);
  90MODULE_AUTHOR("Mattias Jacobsson");
  91MODULE_DESCRIPTION("Xiaomi WMI driver");
  92MODULE_LICENSE("GPL v2");
  93