git://bbs.cooldavid.org / net-next-2.6.git / blame
| 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 | ||
| 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 | ||
| 863fbf49 AV |
35 | /* |
| 36 | * OF GPIO chip for memory mapped banks | |
| 37 | */ | |
| 38 | struct of_mm_gpio_chip { | |
| a19e3da5 | 39 | struct gpio_chip gc; |
| 863fbf49 AV |
40 | void (*save_regs)(struct of_mm_gpio_chip *mm_gc); |
| 41 | void __iomem *regs; | |
| 42 | }; | |
| 43 | ||
| 44 | static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc) | |
| 45 | { | |
| a19e3da5 | 46 | return container_of(gc, struct of_mm_gpio_chip, gc); |
| 863fbf49 AV |
47 | } |
| 48 | ||
| b908b53d AV |
49 | extern int of_get_gpio_flags(struct device_node *np, int index, |
| 50 | enum of_gpio_flags *flags); | |
| 74982092 | 51 | extern unsigned int of_gpio_count(struct device_node *np); |
| b908b53d | 52 | |
| 863fbf49 AV |
53 | extern int of_mm_gpiochip_add(struct device_node *np, |
| 54 | struct of_mm_gpio_chip *mm_gc); | |
| 594fa265 | 55 | |
| 391c970c AV |
56 | extern void of_gpiochip_add(struct gpio_chip *gc); |
| 57 | extern void of_gpiochip_remove(struct gpio_chip *gc); | |
| 594fa265 GL |
58 | extern struct gpio_chip *of_node_to_gpiochip(struct device_node *np); |
| 59 | ||
| a19e3da5 | 60 | #else /* CONFIG_OF_GPIO */ |
| 863fbf49 AV |
61 | |
| 62 | /* Drivers may not strictly depend on the GPIO support, so let them link. */ | |
| b908b53d AV |
63 | static inline int of_get_gpio_flags(struct device_node *np, int index, |
| 64 | enum of_gpio_flags *flags) | |
| 863fbf49 AV |
65 | { |
| 66 | return -ENOSYS; | |
| 67 | } | |
| 68 | ||
| 74982092 AV |
69 | static inline unsigned int of_gpio_count(struct device_node *np) |
| 70 | { | |
| 71 | return 0; | |
| 72 | } | |
| 73 | ||
| 391c970c AV |
74 | static inline void of_gpiochip_add(struct gpio_chip *gc) { } |
| 75 | static inline void of_gpiochip_remove(struct gpio_chip *gc) { } | |
| 76 | ||
| 863fbf49 AV |
77 | #endif /* CONFIG_OF_GPIO */ |
| 78 | ||
| b908b53d AV |
79 | /** |
| 80 | * of_get_gpio - Get a GPIO number to use with GPIO API | |
| 81 | * @np: device node to get GPIO from | |
| 82 | * @index: index of the GPIO | |
| 83 | * | |
| 84 | * Returns GPIO number to use with Linux generic GPIO API, or one of the errno | |
| 85 | * value on the error condition. | |
| 86 | */ | |
| 87 | static inline int of_get_gpio(struct device_node *np, int index) | |
| 88 | { | |
| 89 | return of_get_gpio_flags(np, index, NULL); | |
| 90 | } | |
| 91 | ||
| 863fbf49 | 92 | #endif /* __LINUX_OF_GPIO_H */ |