drivers/hid/hid-generic.c

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

File Facts

System
Linux kernel
Corpus path
drivers/hid/hid-generic.c
Extension
.c
Size
2187 bytes
Lines
99
Domain
Driver Families
Bucket
drivers/hid
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern 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

static int __check_hid_generic(struct device_driver *drv, void *data)
{
	struct hid_driver *hdrv = to_hid_driver(drv);
	struct hid_device *hdev = data;

	if (hdrv == &hid_generic)
		return 0;

	return hid_match_device(hdev, hdrv) != NULL;
}

static bool hid_generic_match(struct hid_device *hdev,
			      bool ignore_special_driver)
{
	if (ignore_special_driver)
		return true;

	if (hdev->quirks & HID_QUIRK_IGNORE_SPECIAL_DRIVER)
		return true;

	if (hdev->quirks & HID_QUIRK_HAVE_SPECIAL_DRIVER)
		return false;

	/*
	 * If any other driver wants the device, leave the device to this other
	 * driver.
	 */
	if (bus_for_each_drv(&hid_bus_type, NULL, hdev, __check_hid_generic))
		return false;

	return true;
}

static int hid_generic_probe(struct hid_device *hdev,
			     const struct hid_device_id *id)
{
	int ret;

	hdev->quirks |= HID_QUIRK_INPUT_PER_APP;

	ret = hid_parse(hdev);
	if (ret)
		return ret;

	return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
}

static int hid_generic_reset_resume(struct hid_device *hdev)
{
	if (hdev->claimed & HID_CLAIMED_INPUT)
		hidinput_reset_resume(hdev);

	return 0;
}

static const struct hid_device_id hid_table[] = {
	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, HID_ANY_ID, HID_ANY_ID) },
	{ }
};
MODULE_DEVICE_TABLE(hid, hid_table);

static struct hid_driver hid_generic = {
	.name = "hid-generic",
	.id_table = hid_table,
	.match = hid_generic_match,
	.probe = hid_generic_probe,
	.reset_resume = hid_generic_reset_resume,
};
module_hid_driver(hid_generic);

MODULE_AUTHOR("Henrik Rydberg");
MODULE_DESCRIPTION("HID generic driver");
MODULE_LICENSE("GPL");

Annotation

Implementation Notes