gpio: mockup: add helpers for accessing the gpio ranges

In order to avoid repeating the calculations on every access - add
helpers for gpio base and ngpio components of the ranges array.
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-mockup.c

@@ -81,6 +81,16 @@ module_param_named(gpio_mockup_named_lines,
 
 static struct dentry *gpio_mockup_dbg_dir;
 
+static int gpio_mockup_range_base(unsigned int index)
+{
+	return gpio_mockup_ranges[index * 2];
+}
+
+static int gpio_mockup_range_ngpio(unsigned int index)
+{
+	return gpio_mockup_ranges[index * 2 + 1];
+}
+
 static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset)
 {
 	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
@@ -351,7 +361,7 @@ static int __init gpio_mockup_init(void)
 	 * always be greater than 0.
 	 */
 	for (i = 0; i < num_chips; i++) {
-		if (gpio_mockup_ranges[i * 2 + 1] < 0)
+		if (gpio_mockup_range_ngpio(i) < 0)
 			return -EINVAL;
 	}
 
@@ -367,10 +377,10 @@ static int __init gpio_mockup_init(void)
 
 	for (i = 0; i < num_chips; i++) {
 		pdata.index = index++;
-		pdata.base = gpio_mockup_ranges[i * 2];
+		pdata.base = gpio_mockup_range_base(i);
 		pdata.ngpio = pdata.base < 0
-				? gpio_mockup_ranges[i * 2 + 1]
-				: gpio_mockup_ranges[i * 2 + 1] - pdata.base;
+				? gpio_mockup_range_ngpio(i)
+				: gpio_mockup_range_ngpio(i) - pdata.base;
 		pdata.named_lines = gpio_mockup_named_lines;
 
 		pdev = platform_device_register_resndata(NULL,