Add constant clicking area to capabilities

The trackpads with integrated button have a dedicated clicking area
at the bottom of the pad. This patch adds the position of the onset
of the clicking area to capabilities.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/capabilities.c b/src/capabilities.c
index 065c810..1f555f9 100644
--- a/src/capabilities.c
+++ b/src/capabilities.c
@@ -26,6 +26,8 @@
 
 #define ADDCAP(s, c, x) strcat(s, c->has_##x ? " " #x : "")
 
+#define CLICK_AREA(c) ((c->has_ibt ? 0.20 : 0.00) * get_cap_ysize(c))
+
 static const int SN_COORD = 250;        /* coordinate signal-to-noise ratio */
 
 static const int bits_per_long = 8 * sizeof(long);
@@ -102,6 +104,8 @@ int read_capabilities(struct Capabilities *cap, int fd)
                 cap->yfuzz = get_cap_ysize(cap) / SN_COORD;
         }
 
+        cap->yclick = cap->abs_position_y.maximum - CLICK_AREA(cap);
+
         return 0;
 }