drivers/platform/x86/xiaomi-wmi.c

Source file repositories/reference/linux-study-clean/drivers/platform/x86/xiaomi-wmi.c

File Facts

System
Linux kernel
Corpus path
drivers/platform/x86/xiaomi-wmi.c
Extension
.c
Size
2743 bytes
Lines
97
Domain
Driver Families
Bucket
drivers/platform
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct xiaomi_wmi {
	struct input_dev *input_dev;
	struct mutex key_lock;	/* Protects the key event sequence */
	unsigned int key_code;
};

static int xiaomi_wmi_probe(struct wmi_device *wdev, const void *context)
{
	struct xiaomi_wmi *data;
	int ret;

	if (!context)
		return -EINVAL;

	data = devm_kzalloc(&wdev->dev, sizeof(struct xiaomi_wmi), GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;
	dev_set_drvdata(&wdev->dev, data);

	ret = devm_mutex_init(&wdev->dev, &data->key_lock);
	if (ret < 0)
		return ret;

	data->input_dev = devm_input_allocate_device(&wdev->dev);
	if (data->input_dev == NULL)
		return -ENOMEM;
	data->input_dev->name = "Xiaomi WMI keys";
	data->input_dev->phys = "wmi/input0";

	data->key_code = *((const unsigned int *)context);
	set_bit(EV_KEY, data->input_dev->evbit);
	set_bit(data->key_code, data->input_dev->keybit);

	return input_register_device(data->input_dev);
}

static void xiaomi_wmi_notify(struct wmi_device *wdev, const struct wmi_buffer *dummy)
{
	struct xiaomi_wmi *data = dev_get_drvdata(&wdev->dev);

	mutex_lock(&data->key_lock);
	input_report_key(data->input_dev, data->key_code, 1);
	input_sync(data->input_dev);
	input_report_key(data->input_dev, data->key_code, 0);
	input_sync(data->input_dev);
	mutex_unlock(&data->key_lock);
}

static const struct wmi_device_id xiaomi_wmi_id_table[] = {
	// { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_0, KEY_FN_ESC) },
	// { XIAOMI_DEVICE(XIAOMI_KEY_FN_ESC_1, KEY_FN_ESC) },
	{ XIAOMI_DEVICE(XIAOMI_KEY_FN_FN, KEY_PROG1) },
	// { XIAOMI_DEVICE(XIAOMI_KEY_CAPSLOCK, KEY_CAPSLOCK) },
	{ XIAOMI_DEVICE(XIAOMI_KEY_FN_F7, KEY_CUT) },

	/* Terminating entry */
	{ }
};

static struct wmi_driver xiaomi_wmi_driver = {
	.driver = {
		.name = "xiaomi-wmi",
	},
	.id_table = xiaomi_wmi_id_table,
	.min_event_size = 0,
	.probe = xiaomi_wmi_probe,
	.notify_new = xiaomi_wmi_notify,
	.no_singleton = true,
};
module_wmi_driver(xiaomi_wmi_driver);

MODULE_DEVICE_TABLE(wmi, xiaomi_wmi_id_table);
MODULE_AUTHOR("Mattias Jacobsson");
MODULE_DESCRIPTION("Xiaomi WMI driver");
MODULE_LICENSE("GPL v2");

Annotation

Implementation Notes