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TOMOYO Linux Cross Reference
Linux/include/linux/of_gpio.h

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  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/compiler.h>
 18 #include <linux/kernel.h>
 19 #include <linux/errno.h>
 20 #include <linux/gpio.h>
 21 #include <linux/of.h>
 22 
 23 struct device_node;
 24 
 25 /*
 26  * This is Linux-specific flags. By default controllers' and Linux' mapping
 27  * match, but GPIO controllers are free to translate their own flags to
 28  * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended.
 29  */
 30 enum of_gpio_flags {
 31         OF_GPIO_ACTIVE_LOW = 0x1,
 32 };
 33 
 34 #ifdef CONFIG_OF_GPIO
 35 
 36 /*
 37  * OF GPIO chip for memory mapped banks
 38  */
 39 struct of_mm_gpio_chip {
 40         struct gpio_chip gc;
 41         void (*save_regs)(struct of_mm_gpio_chip *mm_gc);
 42         void __iomem *regs;
 43 };
 44 
 45 static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
 46 {
 47         return container_of(gc, struct of_mm_gpio_chip, gc);
 48 }
 49 
 50 extern int of_get_named_gpio_flags(struct device_node *np,
 51                 const char *list_name, int index, enum of_gpio_flags *flags);
 52 
 53 extern int of_mm_gpiochip_add(struct device_node *np,
 54                               struct of_mm_gpio_chip *mm_gc);
 55 extern void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc);
 56 
 57 extern int of_gpiochip_add(struct gpio_chip *gc);
 58 extern void of_gpiochip_remove(struct gpio_chip *gc);
 59 extern int of_gpio_simple_xlate(struct gpio_chip *gc,
 60                                 const struct of_phandle_args *gpiospec,
 61                                 u32 *flags);
 62 
 63 #else /* CONFIG_OF_GPIO */
 64 
 65 /* Drivers may not strictly depend on the GPIO support, so let them link. */
 66 static inline int of_get_named_gpio_flags(struct device_node *np,
 67                 const char *list_name, int index, enum of_gpio_flags *flags)
 68 {
 69         return -ENOSYS;
 70 }
 71 
 72 static inline int of_gpio_simple_xlate(struct gpio_chip *gc,
 73                                        const struct of_phandle_args *gpiospec,
 74                                        u32 *flags)
 75 {
 76         return -ENOSYS;
 77 }
 78 
 79 static inline int of_gpiochip_add(struct gpio_chip *gc) { return 0; }
 80 static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
 81 
 82 #endif /* CONFIG_OF_GPIO */
 83 
 84 /**
 85  * of_gpio_named_count() - Count GPIOs for a device
 86  * @np:         device node to count GPIOs for
 87  * @propname:   property name containing gpio specifier(s)
 88  *
 89  * The function returns the count of GPIOs specified for a node.
 90  * Note that the empty GPIO specifiers count too. Returns either
 91  *   Number of gpios defined in property,
 92  *   -EINVAL for an incorrectly formed gpios property, or
 93  *   -ENOENT for a missing gpios property
 94  *
 95  * Example:
 96  * gpios = <0
 97  *          &gpio1 1 2
 98  *          0
 99  *          &gpio2 3 4>;
100  *
101  * The above example defines four GPIOs, two of which are not specified.
102  * This function will return '4'
103  */
104 static inline int of_gpio_named_count(struct device_node *np, const char* propname)
105 {
106         return of_count_phandle_with_args(np, propname, "#gpio-cells");
107 }
108 
109 /**
110  * of_gpio_count() - Count GPIOs for a device
111  * @np:         device node to count GPIOs for
112  *
113  * Same as of_gpio_named_count, but hard coded to use the 'gpios' property
114  */
115 static inline int of_gpio_count(struct device_node *np)
116 {
117         return of_gpio_named_count(np, "gpios");
118 }
119 
120 static inline int of_get_gpio_flags(struct device_node *np, int index,
121                       enum of_gpio_flags *flags)
122 {
123         return of_get_named_gpio_flags(np, "gpios", index, flags);
124 }
125 
126 /**
127  * of_get_named_gpio() - Get a GPIO number to use with GPIO API
128  * @np:         device node to get GPIO from
129  * @propname:   Name of property containing gpio specifier(s)
130  * @index:      index of the GPIO
131  *
132  * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
133  * value on the error condition.
134  */
135 static inline int of_get_named_gpio(struct device_node *np,
136                                    const char *propname, int index)
137 {
138         return of_get_named_gpio_flags(np, propname, index, NULL);
139 }
140 
141 /**
142  * of_get_gpio() - Get a GPIO number to use with GPIO API
143  * @np:         device node to get GPIO from
144  * @index:      index of the GPIO
145  *
146  * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
147  * value on the error condition.
148  */
149 static inline int of_get_gpio(struct device_node *np, int index)
150 {
151         return of_get_gpio_flags(np, index, NULL);
152 }
153 
154 #endif /* __LINUX_OF_GPIO_H */
155 

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