Input: tsc2007 - check if I2C communication works during probe

Check the result when sending the power down command to the controller.
Signed-off-by: NRichard Röjfors <richard.rojfors.ext@mocean-labs.com>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>

drivers/input/touchscreen/tsc2007.c

@@ -319,15 +319,17 @@ static int __devinit tsc2007_probe(struct i2c_client *client,
 		goto err_free_mem;
 	}
 
+	/* Prepare for touch readings - power down ADC and enable PENIRQ */
+	err = tsc2007_xfer(ts, PWRDOWN);
+	if (err < 0)
+		goto err_free_irq;
+
 	err = input_register_device(input_dev);
 	if (err)
 		goto err_free_irq;
 
 	i2c_set_clientdata(client, ts);
 
-	/* Prepare for touch readings - power down ADC and enable PENIRQ */
-	tsc2007_xfer(ts, PWRDOWN);
-
 	return 0;
 
  err_free_irq: