Input: melfas_mip4 - report palm touches

The driver had the code to differentiate between finger and palm touches,
but did not use this information when reporting contacts. Change it so that
proper "tool" type is assigned to reported contacts.
Signed-off-by: JungHoon Hyun <hyunjunghoon@melfas.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/melfas_mip4.c

@@ -466,7 +466,7 @@ static void mip4_report_touch(struct mip4_ts *ts, u8 *packet)
 {
 	int id;
 	bool __always_unused hover;
-	bool __always_unused palm;
+	bool palm;
 	bool state;
 	u16 x, y;
 	u8 __always_unused pressure_stage = 0;
@@ -522,21 +522,21 @@ static void mip4_report_touch(struct mip4_ts *ts, u8 *packet)
 
 	if (unlikely(id < 0 || id >= MIP4_MAX_FINGERS)) {
 		dev_err(&ts->client->dev, "Screen - invalid slot ID: %d\n", id);
-	} else if (state) {
-		/* Press or Move event */
-		input_mt_slot(ts->input, id);
-		input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, true);
+		goto out;
+	}
+
+	input_mt_slot(ts->input, id);
+	if (input_mt_report_slot_state(ts->input,
+				       palm ? MT_TOOL_PALM : MT_TOOL_FINGER,
+				       state)) {
 		input_report_abs(ts->input, ABS_MT_POSITION_X, x);
 		input_report_abs(ts->input, ABS_MT_POSITION_Y, y);
 		input_report_abs(ts->input, ABS_MT_PRESSURE, pressure);
 		input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, touch_major);
 		input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, touch_minor);
-	} else {
-		/* Release event */
-		input_mt_slot(ts->input, id);
-		input_mt_report_slot_inactive(ts->input);
 	}
 
+out:
 	input_mt_sync_frame(ts->input);
 }
 
@@ -1483,6 +1483,7 @@ static int mip4_probe(struct i2c_client *client)
 	input->keycodesize = sizeof(*ts->key_code);
 	input->keycodemax = ts->key_num;
 
+	input_set_abs_params(input, ABS_MT_TOOL_TYPE, 0, MT_TOOL_PALM, 0, 0);
 	input_set_abs_params(input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0);
 	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0);
 	input_set_abs_params(input, ABS_MT_PRESSURE,