Commit | Line | Data |
---|---|---|
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 | ||
17 | #include <linux/errno.h> | |
18 | #include <asm/gpio.h> | |
19 | ||
20 | #ifdef CONFIG_OF_GPIO | |
21 | ||
22 | /* | |
23 | * Generic OF GPIO chip | |
24 | */ | |
25 | struct of_gpio_chip { | |
26 | struct gpio_chip gc; | |
27 | int gpio_cells; | |
28 | int (*xlate)(struct of_gpio_chip *of_gc, struct device_node *np, | |
29 | const void *gpio_spec); | |
30 | }; | |
31 | ||
32 | static inline struct of_gpio_chip *to_of_gpio_chip(struct gpio_chip *gc) | |
33 | { | |
34 | return container_of(gc, struct of_gpio_chip, gc); | |
35 | } | |
36 | ||
37 | /* | |
38 | * OF GPIO chip for memory mapped banks | |
39 | */ | |
40 | struct of_mm_gpio_chip { | |
41 | struct of_gpio_chip of_gc; | |
42 | void (*save_regs)(struct of_mm_gpio_chip *mm_gc); | |
43 | void __iomem *regs; | |
44 | }; | |
45 | ||
46 | static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc) | |
47 | { | |
48 | struct of_gpio_chip *of_gc = to_of_gpio_chip(gc); | |
49 | ||
50 | return container_of(of_gc, struct of_mm_gpio_chip, of_gc); | |
51 | } | |
52 | ||
53 | extern int of_get_gpio(struct device_node *np, int index); | |
54 | extern int of_mm_gpiochip_add(struct device_node *np, | |
55 | struct of_mm_gpio_chip *mm_gc); | |
56 | extern int of_gpio_simple_xlate(struct of_gpio_chip *of_gc, | |
57 | struct device_node *np, | |
58 | const void *gpio_spec); | |
59 | #else | |
60 | ||
61 | /* Drivers may not strictly depend on the GPIO support, so let them link. */ | |
62 | static inline int of_get_gpio(struct device_node *np, int index) | |
63 | { | |
64 | return -ENOSYS; | |
65 | } | |
66 | ||
67 | #endif /* CONFIG_OF_GPIO */ | |
68 | ||
69 | #endif /* __LINUX_OF_GPIO_H */ |