Input: zforce_ts - make parsing of contacts less confusing

Zforce touch data packet consists of a byte representing number of
contacts followed by several chunks with length of 9 bytes representing
each contact. Instead of accounting for the leading byte by increasing
offset of each field in contacts by one introduce a pointer to contact
data and point it appropriately. This avoids awkward constructs like:

	point.prblty = payload[9 * i + 9];

which makes it seem like there is off-by-one error, in favor of more
straightforward:

	point.prblty = p[8];

Tested-by: Andreas Kemnade <andreas@kemnade.info> # Tolino Shine2HD
Link: https://lore.kernel.org/r/20240824055047.1706392-11-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/zforce_ts.c b/drivers/input/touchscreen/zforce_ts.c
index 32f3d74..c5b4c85 100644 (file)
--- a/drivers/input/touchscreen/zforce_ts.c
+++ b/drivers/input/touchscreen/zforce_ts.c
@@ -318,6 +318,7 @@ static int zforce_touch_event(struct zforce_ts *ts, u8 *payload)
        struct i2c_client *client = ts->client;
        struct zforce_point point;
        int count, i, num = 0;
+       u8 *p;
 
        count = payload[0];
        if (count > ZFORCE_REPORT_POINTS) {
@@ -328,8 +329,10 @@ static int zforce_touch_event(struct zforce_ts *ts, u8 *payload)
        }
 
        for (i = 0; i < count; i++) {
-               point.coord_x = get_unaligned_le16(&payload[9 * i + 1]);
-               point.coord_y = get_unaligned_le16(&payload[9 * i + 3]);
+               p = &payload[i * 9 + 1];
+
+               point.coord_x = get_unaligned_le16(&p[0]);
+               point.coord_y = get_unaligned_le16(&p[2]);
 
                if (point.coord_x > ts->prop.max_x ||
                    point.coord_y > ts->prop.max_y) {
@@ -338,18 +341,16 @@ static int zforce_touch_event(struct zforce_ts *ts, u8 *payload)
                        point.coord_x = point.coord_y = 0;
                }
 
-               point.state = payload[9 * i + 5] & 0x0f;
-               point.id = (payload[9 * i + 5] & 0xf0) >> 4;
+               point.state = p[4] & 0x0f;
+               point.id = (p[4] & 0xf0) >> 4;
 
                /* determine touch major, minor and orientation */
-               point.area_major = max(payload[9 * i + 6],
-                                         payload[9 * i + 7]);
-               point.area_minor = min(payload[9 * i + 6],
-                                         payload[9 * i + 7]);
-               point.orientation = payload[9 * i + 6] > payload[9 * i + 7];
-
-               point.pressure = payload[9 * i + 8];
-               point.prblty = payload[9 * i + 9];
+               point.area_major = max(p[5], p[6]);
+               point.area_minor = min(p[5], p[6]);
+               point.orientation = p[5] > p[6];
+
+               point.pressure = p[7];
+               point.prblty = p[8];
 
                dev_dbg(&client->dev,
                        "point %d/%d: state %d, id %d, pressure %d, prblty %d, x %d, y %d, amajor %d, aminor %d, ori %d\n",