touchpad: always init the left/right palm edge to INT_MIN/MAX

[platform/upstream/libinput.git] / src / evdev-mt-touchpad.c

diff --git a/src/evdev-mt-touchpad.c b/src/evdev-mt-touchpad.c
index 2cf8b56..5db204f 100644 (file)
--- a/src/evdev-mt-touchpad.c
+++ b/src/evdev-mt-touchpad.c
@@ -25,6 +25,7 @@
 #include <assert.h>
 #include <math.h>
 #include <stdbool.h>
+#include <limits.h>
 
 #include "evdev-mt-touchpad.h"
 
@@ -753,9 +754,21 @@ tp_init_palmdetect(struct tp_dispatch *tp,
 {
        int width;
 
+       tp->palm.right_edge = INT_MAX;
+       tp->palm.left_edge = INT_MIN;
+
+       /* We don't know how big the touchpad is */
+       if (device->abs.absinfo_x->resolution == 1)
+               return 0;
+
        width = abs(device->abs.absinfo_x->maximum -
                    device->abs.absinfo_x->minimum);
 
+       /* Enable palm detection on touchpads >= 80 mm. Anything smaller
+          probably won't need it, until we find out it does */
+       if (width/device->abs.absinfo_x->resolution < 80)
+               return 0;
+
        /* palm edges are 5% of the width on each side */
        tp->palm.right_edge = device->abs.absinfo_x->maximum - width * 0.05;
        tp->palm.left_edge = device->abs.absinfo_x->minimum + width * 0.05;