[PATCH 06/14] alps: process_bitmap: Round down when spreading adjescent fingers over 2 points
From: Hans de Goede <hidden>
Date: 2014-07-09 15:24:35
Subsystem:
alps ps/2 touchpad driver, input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
This fixes 2 fingers at the same height or width on the touchpad getting reported at different y / x coordinates. Note num_bits is always at least 1. Signed-off-by: Hans de Goede <redacted> --- drivers/input/mouse/alps.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index ebf8187..f8c04fc 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c@@ -391,13 +391,13 @@ static int alps_process_bitmap(struct alps_data *priv, * adjacent fingers. Divide the single contact between the two points. */ if (fingers_x == 1) { - i = x_low.num_bits / 2; + i = (x_low.num_bits - 1) / 2; x_low.num_bits = x_low.num_bits - i; x_high.start_bit = x_low.start_bit + i; x_high.num_bits = max(i, 1); } if (fingers_y == 1) { - i = y_low.num_bits / 2; + i = (y_low.num_bits - 1) / 2; y_low.num_bits = y_low.num_bits - i; y_high.start_bit = y_low.start_bit + i; y_high.num_bits = max(i, 1);
--
2.0.0