+

+static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
+{
+	int i, ret, flg;

A "int count = 0;" makes more sense than flg.

+	struct st1232_ts_data *ts = dev_id;
+	struct st1232_ts_finger *finger = ts->finger;
+
+	ret = st1232_ts_read_data(ts);
+	if (ret < 0)
+		goto end;
+
+	/* multi touch protocol */
+	for (i = 0, flg = 0; i < MAX_FINGERS; i++) {

flg initialization is hidden here, see above comment.

+		if (!finger[i].is_valid)
+			continue;
+		else
+			flg = 1;

dropping this...

+
+		input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR,
+					finger[i].t);
+		input_report_abs(ts->input_dev, ABS_MT_POSITION_X, finger[i].x);
+		input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, finger[i].y);
+		input_mt_sync(ts->input_dev);

and simply "count++;" here.

+	}
+
+	/* SYN_MT_REPORT only if no contact */
+	if (!flg)

(!count)

+		input_mt_sync(ts->input_dev);
+
+	/* SYN_REPORT */
+	input_sync(ts->input_dev);
+
+end:
+	return IRQ_HANDLED;
+}
+
+
+	input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR,
+				0, MAX_AREA, 0, 0);
+	input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X,
+				MIN_X, MAX_X, 0, 0);
+	input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y,
+				MIN_Y, MAX_Y, 0, 0);
+
+	ret = input_register_device(ts->input_dev);
+	if (ret) {
+		dev_err(&client->dev, "Unable to register %s input device\n",
+			ts->input_dev->name);
+		goto err_free_input_device;
+	}
+
+	ret = request_threaded_irq(client->irq, NULL, st1232_ts_irq_handler,
+					IRQF_ONESHOT, client->name, ts);
+	if (ret) {
+		dev_err(&client->dev, "Failed to register interrupt\n");
+		goto err_free_input_device;
+	}
+
+	device_init_wakeup(&client->dev, 1);
+
+	return 0;
+
+err_free_input_device:
+	input_free_device(ts->input_dev);
+err_free_mem:
+	kfree(ts);
+err:
+	return ret;
+}

Thank you,
Henrik