video: fbdev: via: 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: Florian Tobias Schandinat <[e-mail]>
Acked-by: Tomi Valkeinen <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/video/fbdev/via/via-gpio.c

···
  */
 
 #include <linux/spinlock.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
 #include <linux/platform_device.h>
 #include <linux/via-core.h>
 #include <linux/via-gpio.h>
···
 static void via_gpio_set(struct gpio_chip *chip, unsigned int nr,
 			 int value)
 {
-	struct viafb_gpio_cfg *cfg = container_of(chip,
-						  struct viafb_gpio_cfg,
-						  gpio_chip);
+	struct viafb_gpio_cfg *cfg = gpiochip_get_data(chip);
 	u8 reg;
 	struct viafb_gpio *gpio;
 	unsigned long flags;
···
  */
 static int via_gpio_dir_input(struct gpio_chip *chip, unsigned int nr)
 {
-	struct viafb_gpio_cfg *cfg = container_of(chip,
-						  struct viafb_gpio_cfg,
-						  gpio_chip);
+	struct viafb_gpio_cfg *cfg = gpiochip_get_data(chip);
 	struct viafb_gpio *gpio;
 	unsigned long flags;
 
···
 
 static int via_gpio_get(struct gpio_chip *chip, unsigned int nr)
 {
-	struct viafb_gpio_cfg *cfg = container_of(chip,
-						  struct viafb_gpio_cfg,
-						  gpio_chip);
+	struct viafb_gpio_cfg *cfg = gpiochip_get_data(chip);
 	u8 reg;
 	struct viafb_gpio *gpio;
 	unsigned long flags;
···
 	 * Get registered.
 	 */
 	viafb_gpio_config.gpio_chip.base = -1;  /* Dynamic */
-	ret = gpiochip_add(&viafb_gpio_config.gpio_chip);
+	ret = gpiochip_add_data(&viafb_gpio_config.gpio_chip,
+				&viafb_gpio_config);
 	if (ret) {
 		printk(KERN_ERR "viafb: failed to add gpios (%d)\n", ret);
 		viafb_gpio_config.gpio_chip.ngpio = 0;