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Commit f8c23156 authored by Simon Wood's avatar Simon Wood Committed by Jiri Kosina
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HID:hid-lg4ff: Scale autocentering force properly on Logitech wheel 



Adjust the scaling and lineartity to match that of the Windows
driver (from MOMO testing).

Reported-by: default avatarElias Vanderstuyft <elias.vds@gmail.com>
Signed-off-by: default avatarSimon Wood <simon@mungewell.org>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 362ecc7c

drivers/hid/hid-lg4ff.c

+12 −3
Original line number Diff line number Diff line
@@ -218,12 +218,21 @@ static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitud 
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;

	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);

	__s32 *value = report->field[0]->value;

	__u32 expand_a, expand_b;



	if (magnitude <= 0xaaaa) {

		expand_a = 0x0c * magnitude;

		expand_b = 0x80 * magnitude;

	} else {

		expand_a = (0x0c * 0xaaaa) + 0x06 * (magnitude - 0xaaaa);

		expand_b = (0x80 * 0xaaaa) + 0xff * (magnitude - 0xaaaa);

	}



	value[0] = 0xfe;

	value[1] = 0x0d;

	value[2] = magnitude >> 13;

	value[3] = magnitude >> 13;

	value[4] = magnitude >> 8;

	value[2] = expand_a / 0xaaaa;

	value[3] = expand_a / 0xaaaa;

	value[4] = expand_b / 0xaaaa;

	value[5] = 0x00;

	value[6] = 0x00;