Input: synaptics - fuzz position for touchpad with reduced filtering
Synaptics touchpads indicate via a capability bit when they perform reduced
filtering on position data. In such a case, use a non-zero fuzz value.
Fuzz = 8 was chosen empirically by observing the raw position data
reported by a clickpad indicating it had reduced filtering.
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 477d1ea..363aedf 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -684,23 +684,25 @@
static void set_input_params(struct input_dev *dev, struct synaptics_data *priv)
{
int i;
+ int fuzz = SYN_CAP_REDUCED_FILTERING(priv->ext_cap_0c) ?
+ SYN_REDUCED_FILTER_FUZZ : 0;
__set_bit(INPUT_PROP_POINTER, dev->propbit);
__set_bit(EV_ABS, dev->evbit);
- input_set_abs_params(dev, ABS_X,
- XMIN_NOMINAL, priv->x_max ?: XMAX_NOMINAL, 0, 0);
- input_set_abs_params(dev, ABS_Y,
- YMIN_NOMINAL, priv->y_max ?: YMAX_NOMINAL, 0, 0);
+ input_set_abs_params(dev, ABS_X, XMIN_NOMINAL,
+ priv->x_max ?: XMAX_NOMINAL, fuzz, 0);
+ input_set_abs_params(dev, ABS_Y, YMIN_NOMINAL,
+ priv->y_max ?: YMAX_NOMINAL, fuzz, 0);
input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
if (SYN_CAP_ADV_GESTURE(priv->ext_cap_0c)) {
__set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
input_mt_init_slots(dev, 2);
input_set_abs_params(dev, ABS_MT_POSITION_X, XMIN_NOMINAL,
- priv->x_max ?: XMAX_NOMINAL, 0, 0);
+ priv->x_max ?: XMAX_NOMINAL, fuzz, 0);
input_set_abs_params(dev, ABS_MT_POSITION_Y, YMIN_NOMINAL,
- priv->y_max ?: YMAX_NOMINAL, 0, 0);
+ priv->y_max ?: YMAX_NOMINAL, fuzz, 0);
input_abs_set_res(dev, ABS_MT_POSITION_X, priv->x_res);
input_abs_set_res(dev, ABS_MT_POSITION_Y, priv->y_res);
@@ -974,4 +976,3 @@
}
#endif /* CONFIG_MOUSE_PS2_SYNAPTICS */
-