/* * 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 */