blob: 52280a2b5e632b1c402b50a99dcbb9891ff83564 [file] [log] [blame]
Anton Vorontsov863fbf42008-04-11 23:06:45 +10001/*
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
Anton Vorontsovb908b532008-12-01 06:30:04 +000017#include <linux/compiler.h>
18#include <linux/kernel.h>
Anton Vorontsov863fbf42008-04-11 23:06:45 +100019#include <linux/errno.h>
Wolfgang Grandegger18ad7a62008-05-30 22:51:33 +100020#include <linux/gpio.h>
Anton Vorontsov863fbf42008-04-11 23:06:45 +100021
Anton Vorontsovb908b532008-12-01 06:30:04 +000022struct device_node;
23
24/*
25 * This is Linux-specific flags. By default controllers' and Linux' mapping
26 * match, but GPIO controllers are free to translate their own flags to
27 * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended.
28 */
29enum of_gpio_flags {
30 OF_GPIO_ACTIVE_LOW = 0x1,
31};
32
Anton Vorontsov863fbf42008-04-11 23:06:45 +100033#ifdef CONFIG_OF_GPIO
34
35/*
Anton Vorontsov863fbf42008-04-11 23:06:45 +100036 * OF GPIO chip for memory mapped banks
37 */
38struct of_mm_gpio_chip {
Anton Vorontsova19e3da2010-06-08 07:48:16 -060039 struct gpio_chip gc;
Anton Vorontsov863fbf42008-04-11 23:06:45 +100040 void (*save_regs)(struct of_mm_gpio_chip *mm_gc);
41 void __iomem *regs;
42};
43
44static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
45{
Anton Vorontsova19e3da2010-06-08 07:48:16 -060046 return container_of(gc, struct of_mm_gpio_chip, gc);
Anton Vorontsov863fbf42008-04-11 23:06:45 +100047}
48
John Bonesioa6b09192011-06-27 16:49:57 -070049extern int of_get_named_gpio_flags(struct device_node *np,
50 const char *list_name, int index, enum of_gpio_flags *flags);
51
Anton Vorontsov74982092008-12-05 08:15:54 +000052extern unsigned int of_gpio_count(struct device_node *np);
Anton Vorontsovb908b532008-12-01 06:30:04 +000053
Anton Vorontsov863fbf42008-04-11 23:06:45 +100054extern int of_mm_gpiochip_add(struct device_node *np,
55 struct of_mm_gpio_chip *mm_gc);
Grant Likely594fa262010-06-08 07:48:16 -060056
Anton Vorontsov391c9702010-06-08 07:48:17 -060057extern void of_gpiochip_add(struct gpio_chip *gc);
58extern void of_gpiochip_remove(struct gpio_chip *gc);
Grant Likely594fa262010-06-08 07:48:16 -060059extern struct gpio_chip *of_node_to_gpiochip(struct device_node *np);
Jamie Iles3038bbd2011-07-28 16:25:41 +010060extern int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
61 const void *gpio_spec, u32 *flags);
Grant Likely594fa262010-06-08 07:48:16 -060062
Anton Vorontsova19e3da2010-06-08 07:48:16 -060063#else /* CONFIG_OF_GPIO */
Anton Vorontsov863fbf42008-04-11 23:06:45 +100064
65/* Drivers may not strictly depend on the GPIO support, so let them link. */
John Bonesioa6b09192011-06-27 16:49:57 -070066static inline int of_get_named_gpio_flags(struct device_node *np,
67 const char *list_name, int index, enum of_gpio_flags *flags)
Anton Vorontsov863fbf42008-04-11 23:06:45 +100068{
69 return -ENOSYS;
70}
71
Anton Vorontsov74982092008-12-05 08:15:54 +000072static inline unsigned int of_gpio_count(struct device_node *np)
73{
74 return 0;
75}
76
Jamie Iles3038bbd2011-07-28 16:25:41 +010077static inline int of_gpio_simple_xlate(struct gpio_chip *gc,
78 struct device_node *np,
79 const void *gpio_spec, u32 *flags)
80{
81 return -ENOSYS;
82}
83
Anton Vorontsov391c9702010-06-08 07:48:17 -060084static inline void of_gpiochip_add(struct gpio_chip *gc) { }
85static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
86
Anton Vorontsov863fbf42008-04-11 23:06:45 +100087#endif /* CONFIG_OF_GPIO */
88
Anton Vorontsovb908b532008-12-01 06:30:04 +000089/**
John Bonesioa6b09192011-06-27 16:49:57 -070090 * of_get_gpio_flags() - Get a GPIO number and flags to use with GPIO API
91 * @np: device node to get GPIO from
92 * @index: index of the GPIO
93 * @flags: a flags pointer to fill in
94 *
95 * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
96 * value on the error condition. If @flags is not NULL the function also fills
97 * in flags for the GPIO.
98 */
99static inline int of_get_gpio_flags(struct device_node *np, int index,
100 enum of_gpio_flags *flags)
101{
102 return of_get_named_gpio_flags(np, "gpios", index, flags);
103}
104
105/**
106 * of_get_named_gpio() - Get a GPIO number to use with GPIO API
107 * @np: device node to get GPIO from
108 * @propname: Name of property containing gpio specifier(s)
109 * @index: index of the GPIO
110 *
111 * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
112 * value on the error condition.
113 */
114static inline int of_get_named_gpio(struct device_node *np,
115 const char *propname, int index)
116{
117 return of_get_named_gpio_flags(np, propname, index, NULL);
118}
119
120/**
121 * of_get_gpio() - Get a GPIO number to use with GPIO API
Anton Vorontsovb908b532008-12-01 06:30:04 +0000122 * @np: device node to get GPIO from
123 * @index: index of the GPIO
124 *
125 * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
126 * value on the error condition.
127 */
128static inline int of_get_gpio(struct device_node *np, int index)
129{
130 return of_get_gpio_flags(np, index, NULL);
131}
132
Anton Vorontsov863fbf42008-04-11 23:06:45 +1000133#endif /* __LINUX_OF_GPIO_H */