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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 | |
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 | |
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, |
42 | const void *gpio_spec, enum of_gpio_flags *flags); |
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 | |
66 | extern int of_get_gpio_flags(struct device_node *np, int index, |
67 | enum of_gpio_flags *flags); |
68 | extern unsigned int of_gpio_count(struct device_node *np); |
69 | |
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, |
74 | const void *gpio_spec, |
75 | enum of_gpio_flags *flags); |
76 | #else |
77 | |
78 | /* Drivers may not strictly depend on the GPIO support, so let them link. */ |
79 | static inline int of_get_gpio_flags(struct device_node *np, int index, |
80 | enum of_gpio_flags *flags) |
81 | { |
82 | return -ENOSYS; |
83 | } |
84 | |
85 | static inline unsigned int of_gpio_count(struct device_node *np) |
86 | { |
87 | return 0; |
88 | } |
89 | |
90 | #endif /* CONFIG_OF_GPIO */ |
91 | |
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 | |
105 | #endif /* __LINUX_OF_GPIO_H */ |
106 |
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