drivers/hid/hid-lg2ff.c

Source file repositories/reference/linux-study-clean/drivers/hid/hid-lg2ff.c

File Facts

System
Linux kernel
Corpus path
drivers/hid/hid-lg2ff.c
Extension
.c
Size
2225 bytes
Lines
96
Domain
Driver Families
Bucket
drivers/hid
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 lg2ff_device {
	struct hid_report *report;
};

static int play_effect(struct input_dev *dev, void *data,
			 struct ff_effect *effect)
{
	struct hid_device *hid = input_get_drvdata(dev);
	struct lg2ff_device *lg2ff = data;
	int weak, strong;

	strong = effect->u.rumble.strong_magnitude;
	weak = effect->u.rumble.weak_magnitude;

	if (weak || strong) {
		weak = weak * 0xff / 0xffff;
		strong = strong * 0xff / 0xffff;

		lg2ff->report->field[0]->value[0] = 0x51;
		lg2ff->report->field[0]->value[2] = weak;
		lg2ff->report->field[0]->value[4] = strong;
	} else {
		lg2ff->report->field[0]->value[0] = 0xf3;
		lg2ff->report->field[0]->value[2] = 0x00;
		lg2ff->report->field[0]->value[4] = 0x00;
	}

	hid_hw_request(hid, lg2ff->report, HID_REQ_SET_REPORT);
	return 0;
}

int lg2ff_init(struct hid_device *hid)
{
	struct lg2ff_device *lg2ff;
	struct hid_report *report;
	struct hid_input *hidinput;
	struct input_dev *dev;
	int error;

	if (list_empty(&hid->inputs)) {
		hid_err(hid, "no inputs found\n");
		return -ENODEV;
	}
	hidinput = list_entry(hid->inputs.next, struct hid_input, list);
	dev = hidinput->input;

	/* Check that the report looks ok */
	report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7);
	if (!report)
		return -ENODEV;

	lg2ff = kmalloc_obj(struct lg2ff_device);
	if (!lg2ff)
		return -ENOMEM;

	set_bit(FF_RUMBLE, dev->ffbit);

	error = input_ff_create_memless(dev, lg2ff, play_effect);
	if (error) {
		kfree(lg2ff);
		return error;
	}

	lg2ff->report = report;
	report->field[0]->value[0] = 0xf3;
	report->field[0]->value[1] = 0x00;
	report->field[0]->value[2] = 0x00;
	report->field[0]->value[3] = 0x00;
	report->field[0]->value[4] = 0x00;
	report->field[0]->value[5] = 0x00;
	report->field[0]->value[6] = 0x00;

	hid_hw_request(hid, report, HID_REQ_SET_REPORT);

	hid_info(hid, "Force feedback for Logitech variant 2 rumble devices by Anssi Hannula <anssi.hannula@gmail.com>\n");

	return 0;
}

Annotation

Implementation Notes