aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/of_gpio.h
blob: fc2472c3c254caf90956d6850ca0381e51a5fed7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
/*
 * OF helpers for the GPIO API
 *
 * Copyright (c) 2007-2008  MontaVista Software, Inc.
 *
 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#ifndef __LINUX_OF_GPIO_H
#define __LINUX_OF_GPIO_H

#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/gpio.h>

struct device_node;

/*
 * This is Linux-specific flags. By default controllers' and Linux' mapping
 * match, but GPIO controllers are free to translate their own flags to
 * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended.
 */
enum of_gpio_flags {
	OF_GPIO_ACTIVE_LOW = 0x1,
};

#ifdef CONFIG_OF_GPIO

/*
 * Generic OF GPIO chip
 */
struct of_gpio_chip {
	struct gpio_chip gc;
	int gpio_cells;
	int (*xlate)(struct of_gpio_chip *of_gc, struct device_node *np,
		     const void *gpio_spec, enum of_gpio_flags *flags);
};

static inline struct of_gpio_chip *to_of_gpio_chip(struct gpio_chip *gc)
{
	return container_of(gc, struct of_gpio_chip, gc);
}

/*
 * OF GPIO chip for memory mapped banks
 */
struct of_mm_gpio_chip {
	struct of_gpio_chip of_gc;
	void (*save_regs)(struct of_mm_gpio_chip *mm_gc);
	void __iomem *regs;
};

static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
{
	struct of_gpio_chip *of_gc = to_of_gpio_chip(gc);

	return container_of(of_gc, struct of_mm_gpio_chip, of_gc);
}

extern int of_get_gpio_flags(struct device_node *np, int index,
			     enum of_gpio_flags *flags);
extern unsigned int of_gpio_count(struct device_node *np);

extern int of_mm_gpiochip_add(struct device_node *np,
			      struct of_mm_gpio_chip *mm_gc);
extern int of_gpio_simple_xlate(struct of_gpio_chip *of_gc,
				struct device_node *np,
				const void *gpio_spec,
				enum of_gpio_flags *flags);
#else

/* Drivers may not strictly depend on the GPIO support, so let them link. */
static inline int of_get_gpio_flags(struct device_node *np, int index,
				    enum of_gpio_flags *flags)
{
	return -ENOSYS;
}

static inline unsigned int of_gpio_count(struct device_node *np)
{
	return 0;
}

#endif /* CONFIG_OF_GPIO */

/**
 * of_get_gpio - Get a GPIO number to use with GPIO API
 * @np:		device node to get GPIO from
 * @index:	index of the GPIO
 *
 * Returns GPIO number to use with Linux generic GPIO API, or one of the errno
 * value on the error condition.
 */
static inline int of_get_gpio(struct device_node *np, int index)
{
	return of_get_gpio_flags(np, index, NULL);
}

#endif /* __LINUX_OF_GPIO_H */