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 <hdegoede@xxxxxxxxxx>
---
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
--
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