ASoC: wm8996: use gpiochip data pointer

This makes the driver use the data pointer added to the gpio_chip
to store a pointer to the state container instead of relying on
container_of().

Cc: Liam Girdwood <[e-mail]>
Cc: [e-mail]
Acked-by: Charles Keepax <[e-mail]>
Acked-by: Mark Brown <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

sound/soc/codecs/wm8996.c

···
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/gcd.h>
+#include <linux/gpio/driver.h>
 #include <linux/gpio.h>
 #include <linux/i2c.h>
 #include <linux/regmap.h>
···
 }
 
 #ifdef CONFIG_GPIOLIB
-static inline struct wm8996_priv *gpio_to_wm8996(struct gpio_chip *chip)
-{
-	return container_of(chip, struct wm8996_priv, gpio_chip);
-}
-
 static void wm8996_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
-	struct wm8996_priv *wm8996 = gpio_to_wm8996(chip);
+	struct wm8996_priv *wm8996 = gpiochip_get_data(chip);
 
 	regmap_update_bits(wm8996->regmap, WM8996_GPIO_1 + offset,
 			   WM8996_GP1_LVL, !!value << WM8996_GP1_LVL_SHIFT);
···
 static int wm8996_gpio_direction_out(struct gpio_chip *chip,
 				     unsigned offset, int value)
 {
-	struct wm8996_priv *wm8996 = gpio_to_wm8996(chip);
+	struct wm8996_priv *wm8996 = gpiochip_get_data(chip);
 	int val;
 
 	val = (1 << WM8996_GP1_FN_SHIFT) | (!!value << WM8996_GP1_LVL_SHIFT);
···
 
 static int wm8996_gpio_get(struct gpio_chip *chip, unsigned offset)
 {
-	struct wm8996_priv *wm8996 = gpio_to_wm8996(chip);
+	struct wm8996_priv *wm8996 = gpiochip_get_data(chip);
 	unsigned int reg;
 	int ret;
 
···
 
 static int wm8996_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
 {
-	struct wm8996_priv *wm8996 = gpio_to_wm8996(chip);
+	struct wm8996_priv *wm8996 = gpiochip_get_data(chip);
 
 	return regmap_update_bits(wm8996->regmap, WM8996_GPIO_1 + offset,
 				  WM8996_GP1_FN_MASK | WM8996_GP1_DIR,
···
 	else
 		wm8996->gpio_chip.base = -1;
 
-	ret = gpiochip_add(&wm8996->gpio_chip);
+	ret = gpiochip_add_data(&wm8996->gpio_chip, wm8996);
 	if (ret != 0)
 		dev_err(wm8996->dev, "Failed to add GPIOs: %d\n", ret);
 }