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863fbf49 AV |
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 | ||
b908b53d AV |
17 | #include <linux/compiler.h> |
18 | #include <linux/kernel.h> | |
863fbf49 | 19 | #include <linux/errno.h> |
18ad7a61 | 20 | #include <linux/gpio.h> |
15c9a0ac | 21 | #include <linux/of.h> |
863fbf49 | 22 | |
b908b53d AV |
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 | ||
863fbf49 AV |
34 | #ifdef CONFIG_OF_GPIO |
35 | ||
863fbf49 AV |
36 | /* |
37 | * OF GPIO chip for memory mapped banks | |
38 | */ | |
39 | struct of_mm_gpio_chip { | |
a19e3da5 | 40 | struct gpio_chip gc; |
863fbf49 AV |
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 | { | |
a19e3da5 | 47 | return container_of(gc, struct of_mm_gpio_chip, gc); |
863fbf49 AV |
48 | } |
49 | ||
f01d9075 | 50 | extern int of_get_named_gpio_flags(struct device_node *np, |
a6b09191 JB |
51 | const char *list_name, int index, enum of_gpio_flags *flags); |
52 | ||
863fbf49 AV |
53 | extern int of_mm_gpiochip_add(struct device_node *np, |
54 | struct of_mm_gpio_chip *mm_gc); | |
d621e8ba | 55 | extern void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc); |
594fa265 | 56 | |
391c970c AV |
57 | extern void of_gpiochip_add(struct gpio_chip *gc); |
58 | extern void of_gpiochip_remove(struct gpio_chip *gc); | |
15c9a0ac GL |
59 | extern int of_gpio_simple_xlate(struct gpio_chip *gc, |
60 | const struct of_phandle_args *gpiospec, | |
61 | u32 *flags); | |
594fa265 | 62 | |
a19e3da5 | 63 | #else /* CONFIG_OF_GPIO */ |
863fbf49 AV |
64 | |
65 | /* Drivers may not strictly depend on the GPIO support, so let them link. */ | |
f01d9075 | 66 | static inline int of_get_named_gpio_flags(struct device_node *np, |
a6b09191 | 67 | const char *list_name, int index, enum of_gpio_flags *flags) |
863fbf49 | 68 | { |
f01d9075 | 69 | return -ENOSYS; |
863fbf49 AV |
70 | } |
71 | ||
3038bbdf | 72 | static inline int of_gpio_simple_xlate(struct gpio_chip *gc, |
15c9a0ac GL |
73 | const struct of_phandle_args *gpiospec, |
74 | u32 *flags) | |
3038bbdf JI |
75 | { |
76 | return -ENOSYS; | |
77 | } | |
78 | ||
391c970c AV |
79 | static inline void of_gpiochip_add(struct gpio_chip *gc) { } |
80 | static inline void of_gpiochip_remove(struct gpio_chip *gc) { } | |
81 | ||
863fbf49 AV |
82 | #endif /* CONFIG_OF_GPIO */ |
83 | ||
ff64abef | 84 | /** |
e80beb27 | 85 | * of_gpio_named_count() - Count GPIOs for a device |
ff64abef | 86 | * @np: device node to count GPIOs for |
e80beb27 | 87 | * @propname: property name containing gpio specifier(s) |
ff64abef JCPV |
88 | * |
89 | * The function returns the count of GPIOs specified for a node. | |
e80beb27 GL |
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 | |
ff64abef | 94 | * |
e80beb27 | 95 | * Example: |
ff64abef | 96 | * gpios = <0 |
e80beb27 | 97 | * &gpio1 1 2 |
ff64abef | 98 | * 0 |
e80beb27 GL |
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 | |
ff64abef | 112 | * |
e80beb27 | 113 | * Same as of_gpio_named_count, but hard coded to use the 'gpios' property |
ff64abef | 114 | */ |
e80beb27 | 115 | static inline int of_gpio_count(struct device_node *np) |
ff64abef JCPV |
116 | { |
117 | return of_gpio_named_count(np, "gpios"); | |
118 | } | |
119 | ||
a6b09191 JB |
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 | |
b908b53d AV |
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 | ||
863fbf49 | 154 | #endif /* __LINUX_OF_GPIO_H */ |