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Input: synaptics - ignore bogus mt packet

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In multitouch mode, at least one device (fw: 7.4 id: 0x1c0b1) sometimes
sends a final main packet with x == 1. Since the normal values are above
1472, this is clearly bogus. At the same time, a two-finger touch is
signaled, even though only one finger was on the pad to begin with. This
patch ignores the packet altogether, removing the problem.

Acked-by: Chris Bagwell <chris@cnpbagwell.com>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
This commit is contained in:
Henrik Rydberg 2010-12-18 15:42:30 +01:00
parent fec6e5252b
commit 4f56ce929c
1 changed files with 2 additions and 2 deletions
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4
drivers/input/mouse/synaptics.c
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@ -548,7 +548,7 @@ static void synaptics_process_packet(struct psmouse *psmouse)
return;
}
if (hw.z > 0) {
if (hw.z > 0 && hw.x > 1) {
num_fingers = 1;
finger_width = 5;
if (SYN_CAP_EXTENDED(priv->capabilities)) {
@ -582,7 +582,7 @@ static void synaptics_process_packet(struct psmouse *psmouse)
if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1);
if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0);
if (hw.z > 0) {
if (num_fingers > 0) {
input_report_abs(dev, ABS_X, hw.x);
input_report_abs(dev, ABS_Y, YMAX_NOMINAL + YMIN_NOMINAL - hw.y);
}