extcon: gpio: Use descriptor-based GPIO interface instead of legacy gpio_* API

This patch uses the descriptor-based GPIO interface (gpiod_* API) instead of
legacy gpio_* API and add the internal gpio_extcon_init() to handle
all gpio-related tasks.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
index 27de6ae..279ff8f 100644 (file)
--- a/drivers/extcon/extcon-gpio.c
+++ b/drivers/extcon/extcon-gpio.c
@@ -20,6 +20,7 @@
 #include <linux/extcon.h>
 #include <linux/extcon/extcon-gpio.h>
 #include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
@@ -34,6 +35,7 @@ struct gpio_extcon_data {
        struct delayed_work work;
        unsigned long debounce_jiffies;
 
+       struct gpio_desc *id_gpiod;
        struct gpio_extcon_pdata *pdata;
 };
 
@@ -44,7 +46,7 @@ static void gpio_extcon_work(struct work_struct *work)
                container_of(to_delayed_work(work), struct gpio_extcon_data,
                             work);
 
-       state = gpio_get_value(data->pdata->gpio);
+       state = gpiod_get_value_cansleep(data->id_gpiod);
        if (data->pdata->gpio_active_low)
                state = !state;
        extcon_set_state(data->edev, state);
@@ -59,6 +61,35 @@ static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
        return IRQ_HANDLED;
 }
 
+static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data)
+{
+       struct gpio_extcon_pdata *pdata = data->pdata;
+       int ret;
+
+       ret = devm_gpio_request_one(dev, pdata->gpio, GPIOF_DIR_IN,
+                               dev_name(dev));
+       if (ret < 0)
+               return ret;
+
+       data->id_gpiod = gpio_to_desc(pdata->gpio);
+       if (!data->id_gpiod)
+               return -EINVAL;
+
+       if (pdata->debounce) {
+               ret = gpiod_set_debounce(data->id_gpiod,
+                                       pdata->debounce * 1000);
+               if (ret < 0)
+                       data->debounce_jiffies =
+                               msecs_to_jiffies(pdata->debounce);
+       }
+
+       data->irq = gpiod_to_irq(data->id_gpiod);
+       if (data->irq < 0)
+               return data->irq;
+
+       return 0;
+}
+
 static int gpio_extcon_probe(struct platform_device *pdev)
 {
        struct gpio_extcon_pdata *pdata = dev_get_platdata(&pdev->dev);
@@ -74,25 +105,18 @@ static int gpio_extcon_probe(struct platform_device *pdev)
                                   GFP_KERNEL);
        if (!data)
                return -ENOMEM;
-
-       data->edev = devm_extcon_dev_allocate(&pdev->dev, &pdata->extcon_id);
-       if (IS_ERR(data->edev)) {
-               dev_err(&pdev->dev, "failed to allocate extcon device\n");
-               return -ENOMEM;
-       }
        data->pdata = pdata;
 
-       ret = devm_gpio_request_one(&pdev->dev, data->pdata->gpio, GPIOF_DIR_IN,
-                                   pdev->name);
+       /* Initialize the gpio */
+       ret = gpio_extcon_init(&pdev->dev, data);
        if (ret < 0)
                return ret;
 
-       if (pdata->debounce) {
-               ret = gpio_set_debounce(data->pdata->gpio,
-                                       pdata->debounce * 1000);
-               if (ret < 0)
-                       data->debounce_jiffies =
-                               msecs_to_jiffies(pdata->debounce);
+       /* Allocate the memory of extcon devie and register extcon device */
+       data->edev = devm_extcon_dev_allocate(&pdev->dev, &pdata->extcon_id);
+       if (IS_ERR(data->edev)) {
+               dev_err(&pdev->dev, "failed to allocate extcon device\n");
+               return -ENOMEM;
        }
 
        ret = devm_extcon_dev_register(&pdev->dev, data->edev);
@@ -101,10 +125,10 @@ static int gpio_extcon_probe(struct platform_device *pdev)
 
        INIT_DELAYED_WORK(&data->work, gpio_extcon_work);
 
-       data->irq = gpio_to_irq(data->pdata->gpio);
-       if (data->irq < 0)
-               return data->irq;
-
+       /*
+        * Request the interrput of gpio to detect whether external connector
+        * is attached or detached.
+        */
        ret = devm_request_any_context_irq(&pdev->dev, data->irq,
                                        gpio_irq_handler, pdata->irq_flags,
                                        pdev->name, data);