hwdb: add ID_INPUT_TRACKBALL as additional identifier (#3872)

Whether a device is a trackball or not is a physical property so we should
store this globally, in one place. The new property must be set in addition to
ID_INPUT_MOUSE, otherwise existing clients won't detect the device.

No actual code changes required, the default match rule is simply checking for
"Trackball" in the name (in a few versions), other entries need to be added
manually.

hwdb/70-mouse.hwdb

@@ -44,10 +44,18 @@
 #   udevadm info /dev/input/eventXX.
 #
 # Allowed properties are:
+#    ID_INPUT_TRACKBALL
 #    MOUSE_DPI
 #    MOUSE_WHEEL_CLICK_ANGLE
 #
 #########################################
+#         ID_INPUT_TRACKBALL            #
+#########################################
+#
+# Specified *in additition* to ID_INPUT_MOUSE if the device is a trackball.
+# Removing ID_INPUT_MOUSE will break backwards compatibility.
+#
+#########################################
 #               MOUSE_DPI               #
 #########################################
 #
@@ -101,6 +109,14 @@
 # Sort by brand, type (usb, bluetooth), DPI, frequency.
 # For mice with switchable resolution, sort by the starred entry.
 
+##########################################
+# Generic
+##########################################
+mouse:*:name:*Trackball*:
+mouse:*:name:*trackball*:
+mouse:*:name:*TrackBall*:
+ ID_INPUT_TRACKBALL=1
+
 ##########################################
 # Apple
 ##########################################
@@ -231,6 +247,7 @@ mouse:usb:v04b3p310c:name:USB Optical Mouse:
 # Logitech M570 trackball
 mouse:usb:v046dp1028:name:Logitech M570:
  MOUSE_DPI=540@167
+ ID_INPUT_TRACKBALL=1
 
 # Logitech USB-PS/2 M-BZ96C
 mouse:usb:v046dpc045:name:Logitech USB-PS/2 Optical Mouse: