Use the event source time instead of the arrival time

The SYN_REPORT event time is equal to the time when the collective
event was produced in the kernel driver, and thus better represents
the actual device timings than the current arrival time.

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

1 files changed, 4 insertions, 11 deletions

diff --git a/src/hwdata.c b/src/hwdata.c
index f204884..d696e07 100644
--- a/src/hwdata.c
+++ b/src/hwdata.c
@@ -26,14 +26,6 @@ void init_hwdata(struct HWData *hw)
         memset(hw, 0, sizeof(struct HWData));
 }
 
-static mstime_t get_mstime()
-{
-        static const mstime_t ms = 1000;
-        struct timeval now;
-        gettimeofday(&now, NULL);
-        return now.tv_usec / ms + now.tv_sec * ms;
-}
-
 static void set_value(struct HWData *hw, int code, int value)
 {
         if (hw->nread < DIM_FINGER) {
@@ -54,11 +46,12 @@ static void accept_finger(struct HWData *hw)
                 hw->mread[hw->nread] = 0;
 }
 
-static void accept_packet(struct HWData *hw)
+static void accept_packet(struct HWData *hw, const struct timeval* tv)
 {
+        static const mstime_t ms = 1000;
         hw->nread = 0;
         hw->mread[hw->nread] = 0;
-        hw->evtime = get_mstime();
+        hw->evtime = tv->tv_usec / ms + tv->tv_sec * ms;
 }
 
 int read_hwdata(struct HWData *hw, const struct input_event* ev)
@@ -67,7 +60,7 @@ int read_hwdata(struct HWData *hw, const struct input_event* ev)
         case EV_SYN:
                 switch (ev->code) {
                 case SYN_REPORT:
-                        accept_packet(hw);
+                        accept_packet(hw, &ev->time);
                         return 1;
                 case SYN_MT_REPORT:
                         accept_finger(hw);