drivers/hid/hid-sensor-hub.c

Source file repositories/reference/linux-study-clean/drivers/hid/hid-sensor-hub.c

File Facts

System
Linux kernel
Corpus path
drivers/hid/hid-sensor-hub.c
Extension
.c
Size
21831 bytes
Lines
782
Domain
Driver Families
Bucket
drivers/hid
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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 sensor_hub_data {
	struct mutex mutex;
	spinlock_t lock;
	struct list_head dyn_callback_list;
	spinlock_t dyn_callback_lock;
	struct mfd_cell *hid_sensor_hub_client_devs;
	int hid_sensor_client_cnt;
	int ref_cnt;
};

/**
 * struct hid_sensor_hub_callbacks_list - Stores callback list
 * @list:		list head.
 * @usage_id:		usage id for a physical device.
 * @hsdev:		Stored hid instance for current hub device.
 * @usage_callback:	Stores registered callback functions.
 * @priv:		Private data for a physical device.
 */
struct hid_sensor_hub_callbacks_list {
	struct list_head list;
	u32 usage_id;
	struct hid_sensor_hub_device *hsdev;
	struct hid_sensor_hub_callbacks *usage_callback;
	void *priv;
};

static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
						int dir)
{
	struct hid_report *report;

	list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
		if (report->id == id)
			return report;
	}
	hid_warn(hdev, "No report with id 0x%x found\n", id);

	return NULL;
}

static int sensor_hub_get_physical_device_count(struct hid_device *hdev)
{
	int i;
	int count = 0;

	for (i = 0; i < hdev->maxcollection; ++i) {
		struct hid_collection *collection = &hdev->collection[i];
		if (collection->type == HID_COLLECTION_PHYSICAL ||
		    collection->type == HID_COLLECTION_APPLICATION)
			++count;
	}

	return count;
}

static void sensor_hub_fill_attr_info(
		struct hid_sensor_hub_attribute_info *info,
		s32 index, s32 report_id, struct hid_field *field)
{
	info->index = index;
	info->report_id = report_id;
	info->units = field->unit;
	info->unit_expo = field->unit_exponent;
	info->size = (field->report_size * field->report_count)/8;
	info->logical_minimum = field->logical_minimum;
	info->logical_maximum = field->logical_maximum;
}

static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
					struct hid_device *hdev,
					u32 usage_id,
					int collection_index,
					struct hid_sensor_hub_device **hsdev,
					void **priv)
{
	struct hid_sensor_hub_callbacks_list *callback;
	struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
	unsigned long flags;

	spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
	list_for_each_entry(callback, &pdata->dyn_callback_list, list)
		if ((callback->usage_id == usage_id ||
		     callback->usage_id == HID_USAGE_SENSOR_COLLECTION) &&
			(collection_index >=
				callback->hsdev->start_collection_index) &&
			(collection_index <
				callback->hsdev->end_collection_index)) {
			*priv = callback->priv;
			*hsdev = callback->hsdev;
			spin_unlock_irqrestore(&pdata->dyn_callback_lock,

Annotation

Implementation Notes