USB: serial: cp210x: use new GPIO line value setter callbacks

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Signed-off-by: Bartosz Golaszewski <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>

Author: Bartosz Golaszewski

drivers/usb/serial/cp210x.c

@@ -1504,7 +1504,7 @@ static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
 	return !!(mask & BIT(gpio));
 }
 
-static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
+static int cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
 {
 	struct usb_serial *serial = gpiochip_get_data(gc);
 	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
@@ -1559,7 +1559,10 @@ static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
 	if (result < 0) {
 		dev_err(&serial->interface->dev, "failed to set GPIO value: %d\n",
 				result);
+		return result;
 	}
+
+	return 0;
 }
 
 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
@@ -1599,9 +1602,8 @@ static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
 	struct cp210x_serial_private *priv = usb_get_serial_data(serial);
 
 	priv->gpio_input &= ~BIT(gpio);
-	cp210x_gpio_set(gc, gpio, value);
 
-	return 0;
+	return cp210x_gpio_set(gc, gpio, value);
 }
 
 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
@@ -1960,7 +1962,7 @@ static int cp210x_gpio_init(struct usb_serial *serial)
 	priv->gc.direction_input = cp210x_gpio_direction_input;
 	priv->gc.direction_output = cp210x_gpio_direction_output;
 	priv->gc.get = cp210x_gpio_get;
-	priv->gc.set = cp210x_gpio_set;
+	priv->gc.set_rv = cp210x_gpio_set;
 	priv->gc.set_config = cp210x_gpio_set_config;
 	priv->gc.init_valid_mask = cp210x_gpio_init_valid_mask;
 	priv->gc.owner = THIS_MODULE;