When multiple fingers are on the touchpad, W holds the finger
count rather than the width. Retrieve the correct value that is
encoded in X, Y and Z of AGM and SGM packets.
The minimum width reported is 8 rather than 4 in this case, while the
maximum remains 15.
Signed-off-by: Gabriele Mazzotta <gabriele....@gmail.com>
---
drivers/input/mouse/synaptics.c | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index d73a942..133e488 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -661,10 +661,12 @@ static void synaptics_parse_agm(const unsigned char buf[],
switch (agm_packet_type) {
case 1:
/* Gesture packet: (x, y, z) half resolution */
- agm->w = hw->w;
- agm->x = (((buf[4] & 0x0f) << 8) | buf[1]) << 1;
- agm->y = (((buf[4] & 0xf0) << 4) | buf[2]) << 1;
- agm->z = ((buf[3] & 0x30) | (buf[5] & 0x0f)) << 1;
+ agm->w = ((buf[1] & 0x01) |
+ ((buf[2] & 0x01) << 1) |
+ ((buf[5] & 0x01) << 2)) + 8;
+ agm->x = (((buf[4] & 0x0f) << 8) | (buf[1] & 0xfe)) << 1;
+ agm->y = (((buf[4] & 0xf0) << 4) | (buf[2] & 0xfe)) << 1;
+ agm->z = ((buf[3] & 0x30) | (buf[5] & 0x0e)) << 2;
break;
case 2:
@@ -960,6 +962,17 @@ static void synaptics_image_sensor_process(struct psmouse
*psmouse,
else
num_fingers = 4;
+ /* When multiple fingers are on the TouchPad, the width is encoded in
+ * X, Y and Z */
+ if (sgm->w == 0 || sgm->w == 1) {
+ sgm->w = (((sgm->x & BIT(1)) >> 1) |
+ (sgm->y & BIT(1)) |
+ ((sgm->z & BIT(0)) << 2)) + 8;
+ sgm->x &= ~BIT(1);
+ sgm->y &= ~BIT(1);
+ sgm->z &= ~BIT(0);
+ }
+
/* Send resulting input events to user space */
synaptics_report_mt_data(psmouse, sgm, num_fingers);
}
--
2.1.4
--
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