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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> |
863fbf49 | 21 | |
b908b53d AV |
22 | struct 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 | */ | |
29 | enum of_gpio_flags { | |
30 | OF_GPIO_ACTIVE_LOW = 0x1, | |
31 | }; | |
32 | ||
863fbf49 AV |
33 | #ifdef CONFIG_OF_GPIO |
34 | ||
35 | /* | |
36 | * Generic OF GPIO chip | |
37 | */ | |
38 | struct of_gpio_chip { | |
39 | struct gpio_chip gc; | |
40 | int gpio_cells; | |
41 | int (*xlate)(struct of_gpio_chip *of_gc, struct device_node *np, | |
b908b53d | 42 | const void *gpio_spec, enum of_gpio_flags *flags); |
863fbf49 AV |
43 | }; |
44 | ||
45 | static inline struct of_gpio_chip *to_of_gpio_chip(struct gpio_chip *gc) | |
46 | { | |
47 | return container_of(gc, struct of_gpio_chip, gc); | |
48 | } | |
49 | ||
50 | /* | |
51 | * OF GPIO chip for memory mapped banks | |
52 | */ | |
53 | struct of_mm_gpio_chip { | |
54 | struct of_gpio_chip of_gc; | |
55 | void (*save_regs)(struct of_mm_gpio_chip *mm_gc); | |
56 | void __iomem *regs; | |
57 | }; | |
58 | ||
59 | static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc) | |
60 | { | |
61 | struct of_gpio_chip *of_gc = to_of_gpio_chip(gc); | |
62 | ||
63 | return container_of(of_gc, struct of_mm_gpio_chip, of_gc); | |
64 | } | |
65 | ||
b908b53d AV |
66 | extern int of_get_gpio_flags(struct device_node *np, int index, |
67 | enum of_gpio_flags *flags); | |
74982092 | 68 | extern unsigned int of_gpio_count(struct device_node *np); |
b908b53d | 69 | |
863fbf49 AV |
70 | extern int of_mm_gpiochip_add(struct device_node *np, |
71 | struct of_mm_gpio_chip *mm_gc); | |
72 | extern int of_gpio_simple_xlate(struct of_gpio_chip *of_gc, | |
73 | struct device_node *np, | |
b908b53d AV |
74 | const void *gpio_spec, |
75 | enum of_gpio_flags *flags); | |
863fbf49 AV |
76 | #else |
77 | ||
78 | /* Drivers may not strictly depend on the GPIO support, so let them link. */ | |
b908b53d AV |
79 | static inline int of_get_gpio_flags(struct device_node *np, int index, |
80 | enum of_gpio_flags *flags) | |
863fbf49 AV |
81 | { |
82 | return -ENOSYS; | |
83 | } | |
84 | ||
74982092 AV |
85 | static inline unsigned int of_gpio_count(struct device_node *np) |
86 | { | |
87 | return 0; | |
88 | } | |
89 | ||
863fbf49 AV |
90 | #endif /* CONFIG_OF_GPIO */ |
91 | ||
b908b53d AV |
92 | /** |
93 | * of_get_gpio - Get a GPIO number to use with GPIO API | |
94 | * @np: device node to get GPIO from | |
95 | * @index: index of the GPIO | |
96 | * | |
97 | * Returns GPIO number to use with Linux generic GPIO API, or one of the errno | |
98 | * value on the error condition. | |
99 | */ | |
100 | static inline int of_get_gpio(struct device_node *np, int index) | |
101 | { | |
102 | return of_get_gpio_flags(np, index, NULL); | |
103 | } | |
104 | ||
863fbf49 | 105 | #endif /* __LINUX_OF_GPIO_H */ |