Add function to get max value for a given ev type

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

2 files changed, 18 insertions, 0 deletions

diff --git a/libevdev/libevdev.c b/libevdev/libevdev.c
index 362e0ff..7e292f6 100644
--- a/libevdev/libevdev.c
+++ b/libevdev/libevdev.c
@@ -929,3 +929,12 @@ libevdev_get_input_prop_name(unsigned int prop)
 
 	return input_prop_map[prop];
 }
+
+int
+libevdev_get_event_type_max(unsigned int type)
+{
+	if (type > EV_MAX)
+		return -1;
+
+	return ev_max[type];
+}
diff --git a/libevdev/libevdev.h b/libevdev/libevdev.h
index 49c34d9..9fd16d8 100644
--- a/libevdev/libevdev.h
+++ b/libevdev/libevdev.h
@@ -527,4 +527,13 @@ const char * libevdev_get_event_code_name(unsigned int type, unsigned int code);
  */
 const char * libevdev_get_input_prop_name(unsigned int prop);
 
+/**
+ * @return The max value defined for the given event type, e.g. ABS_MAX for a type of EV_ABS, or -1
+ * for an invalid type.
+ *
+ * @note The max value is compiled into libevdev. If the kernel changes the
+ * max value, libevdev will not automatically pick these up.
+ */
+int libevdev_get_event_type_max(unsigned int type);
+
 #endif /* libevdev_H */