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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: Elias Vanderstuyft <elias.vds@gmail.com>
Signed-off-by: Simon Wood <simon@mungewell.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Simon Wood 2013-11-06 12:30:40 -07:00 committed by Jiri Kosina
parent 362ecc7c38
commit f8c231569a
1 changed files with 12 additions and 3 deletions
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15
drivers/hid/hid-lg4ff.c
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@ -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;