Listing 17. Checking Global State by Axis
uint8_t abs_b[ABS_MAX/8 + 1];
struct input_absinfo abs_feat;
ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(abs_b)), abs_b);
printf("Supported Absolute axes:\n");
for (yalv = 0; yalv < ABS_MAX; yalv++) {
if (test_bit(yalv, abs_b)) {
printf(" Absolute axis 0x%02x ", yalv);
switch ( yalv)
{
case ABS_X :
printf("(X Axis) ");
break;
case ABS_Y :
printf("(Y Axis) ");
break;
default:
printf("(Unknown abs feature)");
}
if(ioctl(fd, EVIOCGABS(yalv), &abs_feat)) {
perror("evdev EVIOCGABS ioctl");
}
printf("%d (min:%d max:%d flat:%d fuzz:%d)",
abs_feat.value,
abs_feat.minimum,
abs_feat.maximum,
abs_feat.flat,
abs_feat.fuzz);
printf("\n");
}
}
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