Fall back to single-touch position and pressure dimensions

In case mtdev is driving a non-MT device, basic dimensions are not set
properly. Fall back on ABS_X/Y and ABS_PRESSURE, such that basic
pointer operations can be supported through mtdev.

Signed-off-by: Henrik Rydberg <rydberg@bitmath.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/caps.c b/src/caps.c
index d438826..bf578fa 100644
--- a/src/caps.c
+++ b/src/caps.c
@@ -83,6 +83,13 @@ static int read_caps(struct mtdev_caps *cap, int fd)
 
         cap->has_mtdata = has_mt_data(cap);
 
+        if (!cap->has_abs[MTDEV_POSITION_X])
+                getabs(&cap->abs[MTDEV_POSITION_X], ABS_X, fd);
+        if (!cap->has_abs[MTDEV_POSITION_Y])
+                getabs(&cap->abs[MTDEV_POSITION_Y], ABS_Y, fd);
+        if (!cap->has_abs[MTDEV_PRESSURE])
+                getabs(&cap->abs[MTDEV_PRESSURE], ABS_PRESSURE, fd);
+
         if (!cap->has_abs[MTDEV_TRACKING_ID]) {
                 cap->abs[MTDEV_TRACKING_ID].minimum = MT_ID_MIN;
                 cap->abs[MTDEV_TRACKING_ID].maximum = MT_ID_MAX;