gpio: sysfs: pass the GPIO device - not chip - to sysfs callbacks

We're working towards protecting the chip pointer in struct gpio_device
with SRCU. In order to use it in sysfs callbacks we must pass the pointer
to the GPIO device that wraps the chip instead of the address of the
chip itself as the user data.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/gpio/gpiolib-sysfs.c

@@ -401,27 +401,27 @@ static const struct attribute_group *gpio_groups[] = {
 static ssize_t base_show(struct device *dev,
 			       struct device_attribute *attr, char *buf)
 {
-	const struct gpio_chip *chip = dev_get_drvdata(dev);
+	const struct gpio_device *gdev = dev_get_drvdata(dev);
 
-	return sysfs_emit(buf, "%d\n", chip->base);
+	return sysfs_emit(buf, "%d\n", gdev->chip->base);
 }
 static DEVICE_ATTR_RO(base);
 
 static ssize_t label_show(struct device *dev,
 			       struct device_attribute *attr, char *buf)
 {
-	const struct gpio_chip *chip = dev_get_drvdata(dev);
+	const struct gpio_device *gdev = dev_get_drvdata(dev);
 
-	return sysfs_emit(buf, "%s\n", chip->label ?: "");
+	return sysfs_emit(buf, "%s\n", gdev->chip->label ?: "");
 }
 static DEVICE_ATTR_RO(label);
 
 static ssize_t ngpio_show(struct device *dev,
 			       struct device_attribute *attr, char *buf)
 {
-	const struct gpio_chip *chip = dev_get_drvdata(dev);
+	const struct gpio_device *gdev = dev_get_drvdata(dev);
 
-	return sysfs_emit(buf, "%u\n", chip->ngpio);
+	return sysfs_emit(buf, "%u\n", gdev->chip->ngpio);
 }
 static DEVICE_ATTR_RO(ngpio);
 
@@ -751,7 +751,7 @@ int gpiochip_sysfs_register(struct gpio_device *gdev)
 		parent = &gdev->dev;
 
 	/* use chip->base for the ID; it's already known to be unique */
-	dev = device_create_with_groups(&gpio_class, parent, MKDEV(0, 0), chip,
+	dev = device_create_with_groups(&gpio_class, parent, MKDEV(0, 0), gdev,
 					gpiochip_groups, GPIOCHIP_NAME "%d",
 					chip->base);
 	if (IS_ERR(dev))