1 // SPDX-License-Identifier: GPL-2.0 2 /* WMI driver for Xiaomi Laptops */ 3 4 #include <linux/device.h> 5 #include <linux/input.h> 6 #include <linux/module.h> 7 #include <linux/mutex.h> 8 #include <linux/wmi.h> 9 10 #include <uapi/linux/input-event-codes.h> 11 12 #define XIAOMI_KEY_FN_ESC_0 "A2095CCE-0491-44E7-BA27-F8ED8F88AA86" 13 #define XIAOMI_KEY_FN_ESC_1 "7BBE8E39-B486-473D-BA13-66F75C5805CD" 14 #define XIAOMI_KEY_FN_FN "409B028D-F06B-4C7C-8BBB-EE133A6BD87E" 15 #define XIAOMI_KEY_CAPSLOCK "83FE7607-053A-4644-822A-21532C621FC7" 16 #define XIAOMI_KEY_FN_F7 "76E9027C-95D0-4180-8692-DA6747DD1C2D" 17 18 #define XIAOMI_DEVICE(guid, key) \ 19 .guid_string = (guid), \ 20 .context = &(const unsigned int){key} 21 22 struct xiaomi_wmi { 23 struct input_dev *input_dev; 24 struct mutex key_lock; /* Protects the key event sequence */ 25 unsigned int key_code; 26 }; 27 28 static int xiaomi_wmi_probe(struct wmi_device *wdev, const void *context) 29 { 30 struct xiaomi_wmi *data; 31 int ret; 32 33 if (!context) 34 return -EINVAL; 35 36 data = devm_kzalloc(&wdev->dev, sizeof(struct xiaomi_wmi), GFP_KERNEL); 37 if (data == NULL) 38 return -ENOMEM; 39 dev_set_drvdata(&wdev->dev, data); 40 41 ret = devm_mutex_init(&wdev->dev, &data->key_lock); 42 if (ret < 0) 43 return ret; 44 45 data->input_dev = devm_input_allocate_device(&wdev->dev); 46 if (data->input_dev == NULL) 47 return -ENOMEM; 48 data->input_dev->name = "Xiaomi WMI keys"; 49 data->input_dev->phys = "wmi/input0"; 50 51 data->key_code = *((const unsigned int *)context); 52 set_bit(EV_KEY, data->input_dev->evbit); 53 set_bit(data->key_code, data->input_dev->keybit); 54 55 return input_register_device(data->input_dev); 56 } 57 58 static void xiaomi_wmi_notify(struct wmi_device *wdev, const struct wmi_buffer *dummy) 59 { 60 struct xiaomi_wmi *data = dev_get_drvdata(&wdev->dev); 61 62 mutex_lock(&data->key_lock); 63 input_report_key(data->input_dev, data->key_code, 1); 64 input_sync(data->input_dev); 65 input_report_key(data->input_dev, data->key_code, 0); 66 input_sync(data->input_dev); 67 mutex_unlock(&data->key_lock); 68 } 69 70 static const struct wmi_device_id xiaomi_wmi_id_table[] = { 71 // { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_0, KEY_FN_ESC) }, 72 // { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_1, KEY_FN_ESC) }, 73 { XIAOMI_DEVICE(XIAOMI_KEY_FN_FN, KEY_PROG1) }, 74 // { XIAOMI_DEVICE(XIAOMI_KEY_CAPSLOCK, KEY_CAPSLOCK) }, 75 { XIAOMI_DEVICE(XIAOMI_KEY_FN_F7, KEY_CUT) }, 76 77 /* Terminating entry */ 78 { } 79 }; 80 81 static struct wmi_driver xiaomi_wmi_driver = { 82 .driver = { 83 .name = "xiaomi-wmi", 84 }, 85 .id_table = xiaomi_wmi_id_table, 86 .probe = xiaomi_wmi_probe, 87 .notify_new = xiaomi_wmi_notify, 88 .no_singleton = true, 89 }; 90 module_wmi_driver(xiaomi_wmi_driver); 91 92 MODULE_DEVICE_TABLE(wmi, xiaomi_wmi_id_table); 93 MODULE_AUTHOR("Mattias Jacobsson"); 94 MODULE_DESCRIPTION("Xiaomi WMI driver"); 95 MODULE_LICENSE("GPL v2"); 96