1 // SPDX-License-Identifier: GPL-2.0 2 /* 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 23 struct 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 29 static void xiaomi_mutex_destroy(void *data) 30 { 31 struct mutex *lock = data; 32 33 mutex_destroy(lock); 34 } 35 36 static 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 67 static 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 79 static 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 90 static 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 }; 99 module_wmi_driver(xiaomi_wmi_driver); 100 101 MODULE_DEVICE_TABLE(wmi, xiaomi_wmi_id_table); 102 MODULE_AUTHOR("Mattias Jacobsson"); 103 MODULE_DESCRIPTION("Xiaomi WMI driver"); 104 MODULE_LICENSE("GPL v2"); 105