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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>
This commit is contained in:
Hans de Goede 2014-07-25 22:41:51 -07:00 committed by Dmitry Torokhov
parent 036e6c7b54
commit 105affbfd5
1 changed files with 1 additions and 2 deletions
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3
drivers/input/mouse/alps.c
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@ -342,14 +342,13 @@ static void alps_get_bitmap_points(unsigned int map,
if (bit) { if (bit) {
if (!prev_bit) { if (!prev_bit) {
point->start_bit = i; point->start_bit = i;
point->num_bits = 0;
(*fingers)++; (*fingers)++;
} }
point->num_bits++; point->num_bits++;
} else { } else {
if (prev_bit) if (prev_bit)
point = high; point = high;
else
point->num_bits = 0;
} }
prev_bit = bit; prev_bit = bit;
} }