From 8a6d48c0542876eb3acfc0970c0ab7872db08d5f Mon Sep 17 00:00:00 2001 From: Zheng Da Date: Sun, 6 Dec 2009 05:26:23 +0100 Subject: check in the original version of dde linux26. --- libdde_linux26/contrib/include/linux/of_gpio.h | 105 +++++++++++++++++++++++++ 1 file changed, 105 insertions(+) create mode 100644 libdde_linux26/contrib/include/linux/of_gpio.h (limited to 'libdde_linux26/contrib/include/linux/of_gpio.h') diff --git a/libdde_linux26/contrib/include/linux/of_gpio.h b/libdde_linux26/contrib/include/linux/of_gpio.h new file mode 100644 index 00000000..fc2472c3 --- /dev/null +++ b/libdde_linux26/contrib/include/linux/of_gpio.h @@ -0,0 +1,105 @@ +/* + * OF helpers for the GPIO API + * + * Copyright (c) 2007-2008 MontaVista Software, Inc. + * + * Author: Anton Vorontsov + * + * 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 +#include +#include +#include + +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 + +/* + * 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, enum of_gpio_flags *flags); +}; + +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_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 of_gpio_chip *of_gc, + struct device_node *np, + const void *gpio_spec, + enum of_gpio_flags *flags); +#else + +/* 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 */ -- cgit v1.2.3