Input: s3c24xx_ts - report touch only when stylus is down

Currently driver reports touches when it gets (1 << ts.shift) samples,
even if stylus is up, which is incorrect. We should only report coordinates
and touch condition when stylus is down.
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/touchscreen/s3c2410_ts.c

@@ -128,6 +128,7 @@ static void touch_timer_fire(unsigned long data)
 
 	down = get_down(data0, data1);
 
+	if (down) {
 		if (ts.count == (1 << ts.shift)) {
 			ts.xp >>= ts.shift;
 			ts.yp >>= ts.shift;
@@ -146,9 +147,10 @@ static void touch_timer_fire(unsigned long data)
 			ts.count = 0;
 		}
 
-	if (down) {
 		s3c_adc_start(ts.client, 0, 1 << ts.shift);
 	} else {
+		ts.xp = 0;
+		ts.yp = 0;
 		ts.count = 0;
 
 		input_report_key(ts.input, BTN_TOUCH, 0);