Input: rotary-encoder - set gpio direction for each requested gpio

Even with the correct pin mux settings, you still need to explicitly
set the gpio direction. Call gpio_direction_input() after each
requested gpio.
Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
Signed-off-by: Mark Somerville <mark@scottishclimbs.com>
Tested-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/misc/rotary_encoder.c

@@ -152,6 +152,13 @@ static int __devinit rotary_encoder_probe(struct platform_device *pdev)
 		goto exit_unregister_input;
 	}
 
+	err = gpio_direction_input(pdata->gpio_a);
+	if (err) {
+		dev_err(&pdev->dev, "unable to set GPIO %d for input\n",
+			pdata->gpio_a);
+		goto exit_unregister_input;
+	}
+
 	err = gpio_request(pdata->gpio_b, DRV_NAME);
 	if (err) {
 		dev_err(&pdev->dev, "unable to request GPIO %d\n",
@@ -159,6 +166,13 @@ static int __devinit rotary_encoder_probe(struct platform_device *pdev)
 		goto exit_free_gpio_a;
 	}
 
+	err = gpio_direction_input(pdata->gpio_b);
+	if (err) {
+		dev_err(&pdev->dev, "unable to set GPIO %d for input\n",
+			pdata->gpio_b);
+		goto exit_free_gpio_a;
+	}
+
 	/* request the IRQs */
 	err = request_irq(encoder->irq_a, &rotary_encoder_irq,
 			  IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE,