linux evdev: Stop using the time field of input_event

Fixes github issue #104.

The time field is being removed from input_event (evdev) for 32bit
systems, to prepare for the year 2038 32bit timestamp rollover. This
breaks the build for spacenavd on 32bit linux systems.

Turns out that value was only ever used by the incorrect dominant axis
implementation which relied on timeouts (see github issue #84).
Therefore the easy fix for the missing time field is to just drop it
altogether and temporarilly disable the dominant axis code altogether
until it's fixed.

src/dev_usb_linux.c

@@ -290,8 +290,6 @@ static int read_evdev(struct device *dev, struct dev_input *inp)
 	}
 
 	if(rdbytes > 0) {
-		inp->tm = iev.time;
-
 		switch(iev.type) {
 		case EV_REL:
 			inp->type = INP_MOTION;

src/event.c

@@ -48,9 +48,6 @@ struct dev_event {
 	struct dev_event *next;
 };
 
-static struct dev_input inp_dom = { -1, {0}, -1, 0 };
-static int dom_axis_thres = 2;
-
 static struct dev_event *add_dev_event(struct device *dev);
 static struct dev_event *device_event_in_use(struct device *dev);
 static void handle_button_action(int act, int val);
@@ -177,24 +174,7 @@ void process_input(struct device *dev, struct dev_input *inp)
 		axis_sens = axis < 3 ? sens_trans : sens_rot;
 
 		if(dom_axis_mode) {
-			if(inp_dom.idx != -1) {
-				/* if more than 100ms have passed ... */
-				if(inp->tm.tv_sec > inp_dom.tm.tv_sec || inp->tm.tv_usec - inp_dom.tm.tv_usec >= 100000) {
-					inp_dom.idx = -1;
-					memset(&inp_dom.tm, 0, sizeof inp_dom.tm);
-					inp_dom.type = INP_FLUSH;
-					inp_dom.val = 0;
-				}
-			}
-			if((inp_dom.idx == -1 && (inp->val <= dom_axis_thres || inp->val >= dom_axis_thres))
-					|| inp_dom.idx == axis) {
-				inp_dom.idx = axis;
-				inp_dom.tm = inp->tm;
-				inp_dom.type = inp->type;
-				inp_dom.val = inp->val;
-			} else {
-				axis_sens = 0;
-			}
+			/* TODO */
 		}
 		inp->val = (int)((float)inp->val * cfg.sensitivity * axis_sens);
 

src/event.h

@@ -88,7 +88,6 @@ enum {
 
 struct dev_input {
 	int type;
-	struct timeval tm;
 	int idx;
 	int val;
 };