input: ads7846: can't disable filtering

When filtering is disabled the driver will ignore all samples and
never detect the pen up event.
Signed-off-by: Imre Deak <imre.deak@nokia.com>

drivers/input/touchscreen/ads7846.c

@@ -472,7 +472,8 @@ static void ads7846_debounce(void *ads)
 	m = &ts->msg[ts->msg_idx];
 	t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
 	val = (be16_to_cpu(*(__be16 *)t->rx_buf) >> 3) & 0x0fff;
-	if (!ts->read_cnt || (abs(ts->last_read - val) > ts->debounce_tol)) {
+	if (ts->debounce_max && (
+	    !ts->read_cnt || (abs(ts->last_read - val) > ts->debounce_tol))) {
 		/* Repeat it, if this was the first read or the read
 		 * wasn't consistent enough. */
 		if (ts->read_cnt < ts->debounce_max) {
@@ -702,14 +703,9 @@ static int __devinit ads7846_probe(struct spi_device *spi)
 	ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100;
 	ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
 	ts->pressure_max = pdata->pressure_max ? : ~0;
-	if (pdata->debounce_max) {
-		ts->debounce_max = pdata->debounce_max;
-		ts->debounce_tol = pdata->debounce_tol;
-		ts->debounce_rep = pdata->debounce_rep;
-		if (ts->debounce_rep > ts->debounce_max + 1)
-			ts->debounce_rep = ts->debounce_max - 1;
-	} else
-		ts->debounce_tol = ~0;
+	ts->debounce_max = pdata->debounce_max;
+	ts->debounce_tol = pdata->debounce_tol;
+	ts->debounce_rep = pdata->debounce_rep;
 	ts->get_pendown_state = pdata->get_pendown_state;
 
 	snprintf(ts->phys, sizeof(ts->phys), "%s/input0", spi->dev.bus_id);