Fix udev touch detection for multitouch devices (#18482)

GavinDarkglider · web-flow · commit d13b0bd5eb83 · 2025-12-03T08:17:58.000+01:00
diff --git a/input/drivers/udev_input.c b/input/drivers/udev_input.c
@@ -3209,7 +3209,11 @@ static int udev_input_add_device(udev_input_t *udev,
 
       if (ioctl(fd, EVIOCGBIT(EV_ABS, sizeof (abscaps)), abscaps) != -1)
       {
+#ifdef UDEV_TOUCH_SUPPORT
+         if ( ( test_bit(abscaps, ABS_X) && test_bit(abscaps, ABS_Y) ) || ( test_bit(abscaps, ABS_MT_POSITION_X) && test_bit(abscaps, ABS_MT_POSITION_Y) ) )
+#else
          if ( (test_bit(abscaps, ABS_X)) && (test_bit(abscaps, ABS_Y)) )
+#endif
          {
             mouse = 1;
 

Original file line number	Diff line number	Diff line change
`@@ -3209,7 +3209,11 @@ static int udev_input_add_device(udev_input_t *udev,`
`3209`	`3209`
`3210`	`3210`	`if (ioctl(fd, EVIOCGBIT(EV_ABS, sizeof (abscaps)), abscaps) != -1)`
`3211`	`3211`	`{`
	`3212`	`+#ifdef UDEV_TOUCH_SUPPORT`
	`3213`	`+ if ( ( test_bit(abscaps, ABS_X) && test_bit(abscaps, ABS_Y) ) \|\| ( test_bit(abscaps, ABS_MT_POSITION_X) && test_bit(abscaps, ABS_MT_POSITION_Y) ) )`
	`3214`	`+#else`
`3212`	`3215`	`if ( (test_bit(abscaps, ABS_X)) && (test_bit(abscaps, ABS_Y)) )`
	`3216`	`+#endif`
`3213`	`3217`	`{`
`3214`	`3218`	`mouse = 1;`
`3215`	`3219`