1 files changed, 4 insertions, 2 deletions

diff --git a/include/mtdev.h b/include/mtdev.h
index b759803..b621245 100644
--- a/include/mtdev.h
+++ b/include/mtdev.h
@@ -74,11 +74,14 @@
 
 #define MT_ABS_SIZE 11
 
+#define MT_ID_NULL      (-1)
+#define MT_ID_MIN       0
+#define MT_ID_MAX       65535
+
 /**
  * struct mt_caps - protocol capabilities of kernel device
  * @has_mtdata: true if the device has MT capabilities
  * @has_slot: true if the device sends MT slots
- * @nullid: tracking id used to represent null
  * @slot: slot event properties
  * @abs: ABS_MT event properties
  */
@@ -86,7 +89,6 @@ struct mtdev_caps {
         int has_mtdata;
         int has_slot;
         int has_abs[MT_ABS_SIZE];
-        int nullid;
         struct input_absinfo slot;
         struct input_absinfo abs[MT_ABS_SIZE];
 };