| /* |
| * 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/compiler.h> |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/gpio.h> |
| |
| struct device_node; |
| |
| /* |
| * This is Linux-specific flags. By default controllers' and Linux' mapping |
| * match, but GPIO controllers are free to translate their own flags to |
| * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended. |
| */ |
| enum of_gpio_flags { |
| OF_GPIO_ACTIVE_LOW = 0x1, |
| }; |
| |
| #ifdef CONFIG_OF_GPIO |
| |
| /* |
| * OF GPIO chip for memory mapped banks |
| */ |
| struct of_mm_gpio_chip { |
| struct gpio_chip 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) |
| { |
| return container_of(gc, struct of_mm_gpio_chip, gc); |
| } |
| |
| extern int of_get_gpio_flags(struct device_node *np, int index, |
| enum of_gpio_flags *flags); |
| extern unsigned int of_gpio_count(struct device_node *np); |
| |
| extern int of_mm_gpiochip_add(struct device_node *np, |
| struct of_mm_gpio_chip *mm_gc); |
| extern int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np, |
| const void *gpio_spec, u32 *flags); |
| |
| extern struct gpio_chip *of_node_to_gpiochip(struct device_node *np); |
| |
| #else /* CONFIG_OF_GPIO */ |
| |
| /* Drivers may not strictly depend on the GPIO support, so let them link. */ |
| static inline int of_get_gpio_flags(struct device_node *np, int index, |
| enum of_gpio_flags *flags) |
| { |
| return -ENOSYS; |
| } |
| |
| static inline unsigned int of_gpio_count(struct device_node *np) |
| { |
| return 0; |
| } |
| |
| #endif /* CONFIG_OF_GPIO */ |
| |
| /** |
| * of_get_gpio - Get a GPIO number to use with GPIO API |
| * @np: device node to get GPIO from |
| * @index: index of the GPIO |
| * |
| * Returns GPIO number to use with Linux generic GPIO API, or one of the errno |
| * value on the error condition. |
| */ |
| static inline int of_get_gpio(struct device_node *np, int index) |
| { |
| return of_get_gpio_flags(np, index, NULL); |
| } |
| |
| #endif /* __LINUX_OF_GPIO_H */ |