[PATCH] gpio: raspberrypi-exp: use new GPIO line value setter callbacks

[Stefan Wahren]

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: Stefan Wahren <wahrenst at gmx.net>
---
 drivers/gpio/gpio-raspberrypi-exp.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-raspberrypi-exp.c b/drivers/gpio/gpio-raspberrypi-exp.c
index 9d1b95e429f1..b4b607515a04 100644
--- a/drivers/gpio/gpio-raspberrypi-exp.c
+++ b/drivers/gpio/gpio-raspberrypi-exp.c
@@ -175,7 +175,7 @@ static int rpi_exp_gpio_get(struct gpio_chip *gc, unsigned int off)
 	return !!get.state;
 }
 
-static void rpi_exp_gpio_set(struct gpio_chip *gc, unsigned int off, int val)
+static int rpi_exp_gpio_set(struct gpio_chip *gc, unsigned int off, int val)
 {
 	struct rpi_exp_gpio *gpio;
 	struct gpio_get_set_state set;
@@ -188,10 +188,14 @@ static void rpi_exp_gpio_set(struct gpio_chip *gc, unsigned int off, int val)
 
 	ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_STATE,
 					 &set, sizeof(set));
-	if (ret || set.gpio != 0)
+	if (ret || set.gpio != 0) {
 		dev_err(gc->parent,
 			"Failed to set GPIO %u state (%d %x)\n", off, ret,
 			set.gpio);
+		return ret ? ret : -EIO;
+	}
+
+	return 0;
 }
 
 static int rpi_exp_gpio_probe(struct platform_device *pdev)
@@ -228,7 +232,7 @@ static int rpi_exp_gpio_probe(struct platform_device *pdev)
 	rpi_gpio->gc.direction_output = rpi_exp_gpio_dir_out;
 	rpi_gpio->gc.get_direction = rpi_exp_gpio_get_direction;
 	rpi_gpio->gc.get = rpi_exp_gpio_get;
-	rpi_gpio->gc.set = rpi_exp_gpio_set;
+	rpi_gpio->gc.set_rv = rpi_exp_gpio_set;
 	rpi_gpio->gc.can_sleep = true;
 
 	return devm_gpiochip_add_data(dev, &rpi_gpio->gc, rpi_gpio);
-- 
2.34.1