net:rfkill: add a gpio setup function into GPIO rfkill

Add a gpio setup function which gives a chance to set up
platform specific configuration such as pin multiplexing,
input/output direction at the runtime or booting time.
Signed-off-by: Sangwook Lee <sangwook.lee@linaro.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

include/linux/rfkill-gpio.h

@@ -30,6 +30,8 @@
  * @reset_gpio:		GPIO which is used for reseting rfkill switch
  * @shutdown_gpio:	GPIO which is used for shutdown of rfkill switch
  * @power_clk_name:	[optional] name of clk to turn off while blocked
+ * @gpio_runtime_close:	clean up platform specific gpio configuration
+ * @gpio_runtime_setup:	set up platform specific gpio configuration
  */
 
 struct rfkill_gpio_platform_data {
@@ -38,6 +40,8 @@ struct rfkill_gpio_platform_data {
 	int			shutdown_gpio;
 	const char		*power_clk_name;
 	enum rfkill_type	type;
+	void	(*gpio_runtime_close)(struct platform_device *);
+	int	(*gpio_runtime_setup)(struct platform_device *);
 };
 
 #endif /* __RFKILL_GPIO_H */

net/rfkill/rfkill-gpio.c

@@ -101,6 +101,14 @@ static int rfkill_gpio_probe(struct platform_device *pdev)
 	if (!rfkill)
 		return -ENOMEM;
 
+	if (pdata->gpio_runtime_setup) {
+		ret = pdata->gpio_runtime_setup(pdev);
+		if (ret) {
+			pr_warn("%s: can't set up gpio\n", __func__);
+			return ret;
+		}
+	}
+
 	rfkill->pdata = pdata;
 
 	len = strlen(pdata->name);
@@ -182,7 +190,10 @@ static int rfkill_gpio_probe(struct platform_device *pdev)
 static int rfkill_gpio_remove(struct platform_device *pdev)
 {
 	struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
+	struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
 
+	if (pdata->gpio_runtime_close)
+		pdata->gpio_runtime_close(pdev);
 	rfkill_unregister(rfkill->rfkill_dev);
 	rfkill_destroy(rfkill->rfkill_dev);
 	if (gpio_is_valid(rfkill->pdata->shutdown_gpio))