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Commit 036e6c7b authored by Hans de Goede's avatar Hans de Goede Committed by Dmitry Torokhov
Browse files

Input: alps - process_bitmap: add alps_get_bitmap_points() helper function 



Factor out the identical code for getting the bitmap points for x and y into
a helper function.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 40e8f53b

drivers/input/mouse/alps.c

+30 −45
Original line number Diff line number Diff line
@@ -328,6 +328,33 @@ static void alps_process_bitmap_dolphin(struct alps_data *priv, 
	}

}



static void alps_get_bitmap_points(unsigned int map,

				   struct alps_bitmap_point *low,

				   struct alps_bitmap_point *high,

				   int *fingers)

{

	struct alps_bitmap_point *point;

	int i, bit, prev_bit = 0;



	point = low;

	for (i = 0; map != 0; i++, map >>= 1) {

		bit = map & 1;

		if (bit) {

			if (!prev_bit) {

				point->start_bit = i;

				(*fingers)++;

			}

			point->num_bits++;

		} else {

			if (prev_bit)

				point = high;

			else

				point->num_bits = 0;

		}

		prev_bit = bit;

	}

}



/*

 * Process bitmap data from v3 and v4 protocols. Returns the number of

 * fingers detected. A return value of 0 means at least one of the
@@ -342,59 +369,17 @@ static int alps_process_bitmap(struct alps_data *priv, 
			       unsigned int x_map, unsigned int y_map,

			       int *x1, int *y1, int *x2, int *y2)

{

	struct alps_bitmap_point {

		int start_bit;

		int num_bits;

	};



	int fingers_x = 0, fingers_y = 0, fingers;

	int i, bit, prev_bit;

	int i, fingers_x = 0, fingers_y = 0, fingers;

	struct alps_bitmap_point x_low = {0,}, x_high = {0,};

	struct alps_bitmap_point y_low = {0,}, y_high = {0,};

	struct alps_bitmap_point *point;



	if (!x_map || !y_map)

		return 0;



	*x1 = *y1 = *x2 = *y2 = 0;



	prev_bit = 0;

	point = &x_low;

	for (i = 0; x_map != 0; i++, x_map >>= 1) {

		bit = x_map & 1;

		if (bit) {

			if (!prev_bit) {

				point->start_bit = i;

				fingers_x++;

			}

			point->num_bits++;

		} else {

			if (prev_bit)

				point = &x_high;

			else

				point->num_bits = 0;

		}

		prev_bit = bit;

	}



	prev_bit = 0;

	point = &y_low;

	for (i = 0; y_map != 0; i++, y_map >>= 1) {

		bit = y_map & 1;

		if (bit) {

			if (!prev_bit) {

				point->start_bit = i;

				fingers_y++;

			}

			point->num_bits++;

		} else {

			if (prev_bit)

				point = &y_high;

			else

				point->num_bits = 0;

		}

		prev_bit = bit;

	}

	alps_get_bitmap_points(x_map, &x_low, &x_high, &fingers_x);

	alps_get_bitmap_points(y_map, &y_low, &y_high, &fingers_y);



	/*

	 * Fingers can overlap, so we use the maximum count of fingers

drivers/input/mouse/alps.h

+5 −0
Original line number Diff line number Diff line
@@ -65,6 +65,11 @@ struct alps_nibble_commands { 
	unsigned char data;

};



struct alps_bitmap_point {

	int start_bit;

	int num_bits;

};



/**

 * struct alps_fields - decoded version of the report packet

 * @x_map: Bitmap of active X positions for MT.