/*

 * OF helpers for the GPIO API

 *

 * Copyright (c) 2007-2008  MontaVista Software, Inc.

 *

 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 */

#ifndef __LINUX_OF_GPIO_H

#define __LINUX_OF_GPIO_H

#include <linux/errno.h>

#include <linux/gpio.h>

#ifdef CONFIG_OF_GPIO

/*

 * Generic OF GPIO chip

 */

struct of_gpio_chip {

	struct gpio_chip gc;

	int gpio_cells;

	int (*xlate)(struct of_gpio_chip *of_gc, struct device_node *np,

		     const void *gpio_spec);

};

static inline struct of_gpio_chip *to_of_gpio_chip(struct gpio_chip *gc)

{

	return container_of(gc, struct of_gpio_chip, gc);

}

/*

 * OF GPIO chip for memory mapped banks

 */

struct of_mm_gpio_chip {

	struct of_gpio_chip of_gc;

	void (*save_regs)(struct of_mm_gpio_chip *mm_gc);

	void __iomem *regs;

};

static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)

{

	struct of_gpio_chip *of_gc = to_of_gpio_chip(gc);

	return container_of(of_gc, struct of_mm_gpio_chip, of_gc);

}

extern int of_get_gpio(struct device_node *np, int index);

extern int of_mm_gpiochip_add(struct device_node *np,

			      struct of_mm_gpio_chip *mm_gc);

extern int of_gpio_simple_xlate(struct of_gpio_chip *of_gc,

				struct device_node *np,

				const void *gpio_spec);

#else

/* Drivers may not strictly depend on the GPIO support, so let them link. */

static inline int of_get_gpio(struct device_node *np, int index)

{

	return -ENOSYS;

}

#endif /* CONFIG_OF_GPIO */

#endif /* __LINUX_OF_GPIO_H */