Input: alps - process_bitmap: fix counting of high point bits

alps_process_bitmap was resetting the point bit-count as soon as it saw
2 0 bits in a row. This means that unless the high point actually is at
the end of the bitmap, it would always get its num_bits set to 0.

Instead reset num_bits to 0 on a 0->1 transition, so that with > 2 fingers
we only count the number of bits occupied by the highest finger.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index c6af590a07d3..5b35f4fc4d2f 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -342,14 +342,13 @@ static void alps_get_bitmap_points(unsigned int map,
                 if (bit) {
                         if (!prev_bit) {
                                 point->start_bit = i;
+                                point->num_bits = 0;
                                 (*fingers)++;
                         }
                         point->num_bits++;
                 } else {
                         if (prev_bit)
                                 point = high;
-                        else
-                                point->num_bits = 0;
                 }
                 prev_bit = bit;
         }