of_gpio.h revision 18ad7a61e1b700dfe177fabf1c350b4f5d4da8ac
1/* 2 * OF helpers for the GPIO API 3 * 4 * Copyright (c) 2007-2008 MontaVista Software, Inc. 5 * 6 * Author: Anton Vorontsov <avorontsov@ru.mvista.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 */ 13 14#ifndef __LINUX_OF_GPIO_H 15#define __LINUX_OF_GPIO_H 16 17#include <linux/errno.h> 18#include <linux/gpio.h> 19 20#ifdef CONFIG_OF_GPIO 21 22/* 23 * Generic OF GPIO chip 24 */ 25struct of_gpio_chip { 26 struct gpio_chip gc; 27 int gpio_cells; 28 int (*xlate)(struct of_gpio_chip *of_gc, struct device_node *np, 29 const void *gpio_spec); 30}; 31 32static inline struct of_gpio_chip *to_of_gpio_chip(struct gpio_chip *gc) 33{ 34 return container_of(gc, struct of_gpio_chip, gc); 35} 36 37/* 38 * OF GPIO chip for memory mapped banks 39 */ 40struct of_mm_gpio_chip { 41 struct of_gpio_chip of_gc; 42 void (*save_regs)(struct of_mm_gpio_chip *mm_gc); 43 void __iomem *regs; 44}; 45 46static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc) 47{ 48 struct of_gpio_chip *of_gc = to_of_gpio_chip(gc); 49 50 return container_of(of_gc, struct of_mm_gpio_chip, of_gc); 51} 52 53extern int of_get_gpio(struct device_node *np, int index); 54extern int of_mm_gpiochip_add(struct device_node *np, 55 struct of_mm_gpio_chip *mm_gc); 56extern int of_gpio_simple_xlate(struct of_gpio_chip *of_gc, 57 struct device_node *np, 58 const void *gpio_spec); 59#else 60 61/* Drivers may not strictly depend on the GPIO support, so let them link. */ 62static inline int of_get_gpio(struct device_node *np, int index) 63{ 64 return -ENOSYS; 65} 66 67#endif /* CONFIG_OF_GPIO */ 68 69#endif /* __LINUX_OF_GPIO_H */ 70