remove generic input filtering from wheel and pedal axes

+ HID derives fuzz and flat from the logical axis range. On the tested T300
  this gives steering fuzz=255 and flat=4095. It filters small corrections
  and adds a large centered deadzone before applications apply their own
  steering model.

+ Flat is also centered for pedal axes, while their rest position is an
  endpoint. Fuzz without an endpoint deadzone can retain a small nonzero
  value after the hardware has returned to rest. Both behaviours are
  inappropriate for wheel and pedal input, and applications already provide
  the required steering and endpoint deadzones.

+ Override fuzz and flat for every available wheel and pedal axis in
  input_configured on devices handled by hid-tmff2, following the existing
  hid-universal-pidff precedent for high-resolution racing devices. Skip
  absent axes through the input device's absbit mask.

1 files changed, 21 insertions, 0 deletions

diff --git a/src/hid-tmff2.c b/src/hid-tmff2.c
index 02e70f1..55e2173 100644
--- a/src/hid-tmff2.c
+++ b/src/hid-tmff2.c
@@ -807,6 +807,26 @@ static void tmff2_remove(struct hid_device *hdev)
 	kfree(tmff2);
 }
 
+static int tmff2_input_configured(struct hid_device *hdev,
+				  struct hid_input *hidinput)
+{
+	struct input_dev *input = hidinput->input;
+	int axis;
+
+	if (!input->absinfo)
+		return 0;
+
+	for (axis = ABS_X; axis <= ABS_BRAKE; axis++) {
+		if (!test_bit(axis, input->absbit))
+			continue;
+
+		input_abs_set_fuzz(input, axis, 0);
+		input_abs_set_flat(input, axis, 0);
+	}
+
+	return 0;
+}
+
 static const struct hid_device_id tmff2_devices[] = {
 	/* t300rs and variations */
 	{HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, TMT300RS_PS3_NORM_ID)},
@@ -831,6 +851,7 @@ static struct hid_driver tmff2_driver = {
 	.probe = tmff2_probe,
 	.remove = tmff2_remove,
 	.report_fixup = tmff2_report_fixup,
+	.input_configured = tmff2_input_configured,
 };
 module_hid_driver(tmff2_driver);