1 files changed, 11 insertions, 3 deletions

diff --git a/src/touch-caps.c b/src/touch-caps.c
index a51912c..f99b0d7 100644
--- a/src/touch-caps.c
+++ b/src/touch-caps.c
@@ -48,17 +48,25 @@ int touch_caps_is_supported(struct touch_dev *dev, int fd)
 {
         unsigned long keybits[nlongs(KEY_MAX)];
         unsigned long absbits[nlongs(ABS_MAX)];
+        unsigned long relbits[nlongs(REL_CNT)];
         int rc;
 
-        if (dev->mtdev.caps.has_mtdata)
-                return 1;
-
         SYSCALL(rc = ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybits)), keybits));
         if (rc < 0)
                 return 0;
         SYSCALL(rc = ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbits)), absbits));
         if (rc < 0)
                 return 0;
+        SYSCALL(rc = ioctl(fd, EVIOCGBIT(EV_REL, sizeof(relbits)), relbits));
+        if (rc < 0)
+                return 0;
+
+        /* only support pure absolute devices at this time */
+        if (getbit(relbits, REL_X) || getbit(relbits, REL_Y))
+                return 0;
+
+        if (dev->mtdev.caps.has_mtdata)
+                return 1;
 
         return getbit(absbits, ABS_X) &&
                 getbit(absbits, ABS_Y) &&